Re: [PATCH v2] USB: xhci: rename driver to xhci_hcd

From: Sarah Sharp
Date: Tue Mar 16 2010 - 17:09:38 EST

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On Tue, Mar 16, 2010 at 02:48:45PM -0600, Alex Chiang wrote:
> Naming consistency with other USB HCDs.
>
> Signed-off-by: Alex Chiang <achiang@xxxxxx>
> ---
> Refreshed against 2.6.34-rc1 and compile tested.
>
> I didn't refresh the debug one; waiting to hear back from Sarah
> to see if it's worth doing or not.

Yes, it is worth doing. Please send an updated patch. :)

Sarah Sharp

> ---
> drivers/usb/host/Makefile | 4
> drivers/usb/host/xhci-hcd.c | 1916 -------------------------------------------
> drivers/usb/host/xhci.c | 1916 +++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1918 insertions(+), 1918 deletions(-)
> delete mode 100644 drivers/usb/host/xhci-hcd.c
> create mode 100644 drivers/usb/host/xhci.c
>
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index 4e0c67f..b6315aa 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -12,7 +12,7 @@ fhci-objs := fhci-hcd.o fhci-hub.o fhci-q.o fhci-mem.o \
> ifeq ($(CONFIG_FHCI_DEBUG),y)
> fhci-objs += fhci-dbg.o
> endif
> -xhci-objs := xhci-hcd.o xhci-mem.o xhci-pci.o xhci-ring.o xhci-hub.o xhci-dbg.o
> +xhci-hcd-objs := xhci.o xhci-mem.o xhci-pci.o xhci-ring.o xhci-hub.o xhci-dbg.o
>
> obj-$(CONFIG_USB_WHCI_HCD) += whci/
>
> @@ -25,7 +25,7 @@ obj-$(CONFIG_USB_ISP1362_HCD) += isp1362-hcd.o
> obj-$(CONFIG_USB_OHCI_HCD) += ohci-hcd.o
> obj-$(CONFIG_USB_UHCI_HCD) += uhci-hcd.o
> obj-$(CONFIG_USB_FHCI_HCD) += fhci.o
> -obj-$(CONFIG_USB_XHCI_HCD) += xhci.o
> +obj-$(CONFIG_USB_XHCI_HCD) += xhci-hcd.o
> obj-$(CONFIG_USB_SL811_HCD) += sl811-hcd.o
> obj-$(CONFIG_USB_SL811_CS) += sl811_cs.o
> obj-$(CONFIG_USB_U132_HCD) += u132-hcd.o
> diff --git a/drivers/usb/host/xhci-hcd.c b/drivers/usb/host/xhci-hcd.c
> deleted file mode 100644
> index 4cb69e0..0000000
> --- a/drivers/usb/host/xhci-hcd.c
> +++ /dev/null
> @@ -1,1916 +0,0 @@
> -/*
> - * xHCI host controller driver
> - *
> - * Copyright (C) 2008 Intel Corp.
> - *
> - * Author: Sarah Sharp
> - * Some code borrowed from the Linux EHCI driver.
> - *
> - * This program is free software; you can redistribute it and/or modify
> - * it under the terms of the GNU General Public License version 2 as
> - * published by the Free Software Foundation.
> - *
> - * This program is distributed in the hope that it will be useful, but
> - * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
> - * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
> - * for more details.
> - *
> - * You should have received a copy of the GNU General Public License
> - * along with this program; if not, write to the Free Software Foundation,
> - * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> - */
> -
> -#include <linux/irq.h>
> -#include <linux/module.h>
> -#include <linux/moduleparam.h>
> -
> -#include "xhci.h"
> -
> -#define DRIVER_AUTHOR "Sarah Sharp"
> -#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
> -
> -/* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */
> -static int link_quirk;
> -module_param(link_quirk, int, S_IRUGO | S_IWUSR);
> -MODULE_PARM_DESC(link_quirk, "Don't clear the chain bit on a link TRB");
> -
> -/* TODO: copied from ehci-hcd.c - can this be refactored? */
> -/*
> - * handshake - spin reading hc until handshake completes or fails
> - * @ptr: address of hc register to be read
> - * @mask: bits to look at in result of read
> - * @done: value of those bits when handshake succeeds
> - * @usec: timeout in microseconds
> - *
> - * Returns negative errno, or zero on success
> - *
> - * Success happens when the "mask" bits have the specified value (hardware
> - * handshake done). There are two failure modes: "usec" have passed (major
> - * hardware flakeout), or the register reads as all-ones (hardware removed).
> - */
> -static int handshake(struct xhci_hcd *xhci, void __iomem *ptr,
> - u32 mask, u32 done, int usec)
> -{
> - u32 result;
> -
> - do {
> - result = xhci_readl(xhci, ptr);
> - if (result == ~(u32)0) /* card removed */
> - return -ENODEV;
> - result &= mask;
> - if (result == done)
> - return 0;
> - udelay(1);
> - usec--;
> - } while (usec > 0);
> - return -ETIMEDOUT;
> -}
> -
> -/*
> - * Disable interrupts and begin the xHCI halting process.
> - */
> -void xhci_quiesce(struct xhci_hcd *xhci)
> -{
> - u32 halted;
> - u32 cmd;
> - u32 mask;
> -
> - mask = ~(XHCI_IRQS);
> - halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
> - if (!halted)
> - mask &= ~CMD_RUN;
> -
> - cmd = xhci_readl(xhci, &xhci->op_regs->command);
> - cmd &= mask;
> - xhci_writel(xhci, cmd, &xhci->op_regs->command);
> -}
> -
> -/*
> - * Force HC into halt state.
> - *
> - * Disable any IRQs and clear the run/stop bit.
> - * HC will complete any current and actively pipelined transactions, and
> - * should halt within 16 microframes of the run/stop bit being cleared.
> - * Read HC Halted bit in the status register to see when the HC is finished.
> - * XXX: shouldn't we set HC_STATE_HALT here somewhere?
> - */
> -int xhci_halt(struct xhci_hcd *xhci)
> -{
> - xhci_dbg(xhci, "// Halt the HC\n");
> - xhci_quiesce(xhci);
> -
> - return handshake(xhci, &xhci->op_regs->status,
> - STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
> -}
> -
> -/*
> - * Reset a halted HC, and set the internal HC state to HC_STATE_HALT.
> - *
> - * This resets pipelines, timers, counters, state machines, etc.
> - * Transactions will be terminated immediately, and operational registers
> - * will be set to their defaults.
> - */
> -int xhci_reset(struct xhci_hcd *xhci)
> -{
> - u32 command;
> - u32 state;
> -
> - state = xhci_readl(xhci, &xhci->op_regs->status);
> - if ((state & STS_HALT) == 0) {
> - xhci_warn(xhci, "Host controller not halted, aborting reset.\n");
> - return 0;
> - }
> -
> - xhci_dbg(xhci, "// Reset the HC\n");
> - command = xhci_readl(xhci, &xhci->op_regs->command);
> - command |= CMD_RESET;
> - xhci_writel(xhci, command, &xhci->op_regs->command);
> - /* XXX: Why does EHCI set this here? Shouldn't other code do this? */
> - xhci_to_hcd(xhci)->state = HC_STATE_HALT;
> -
> - return handshake(xhci, &xhci->op_regs->command, CMD_RESET, 0, 250 * 1000);
> -}
> -
> -
> -#if 0
> -/* Set up MSI-X table for entry 0 (may claim other entries later) */
> -static int xhci_setup_msix(struct xhci_hcd *xhci)
> -{
> - int ret;
> - struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> -
> - xhci->msix_count = 0;
> - /* XXX: did I do this right? ixgbe does kcalloc for more than one */
> - xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL);
> - if (!xhci->msix_entries) {
> - xhci_err(xhci, "Failed to allocate MSI-X entries\n");
> - return -ENOMEM;
> - }
> - xhci->msix_entries[0].entry = 0;
> -
> - ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
> - if (ret) {
> - xhci_err(xhci, "Failed to enable MSI-X\n");
> - goto free_entries;
> - }
> -
> - /*
> - * Pass the xhci pointer value as the request_irq "cookie".
> - * If more irqs are added, this will need to be unique for each one.
> - */
> - ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0,
> - "xHCI", xhci_to_hcd(xhci));
> - if (ret) {
> - xhci_err(xhci, "Failed to allocate MSI-X interrupt\n");
> - goto disable_msix;
> - }
> - xhci_dbg(xhci, "Finished setting up MSI-X\n");
> - return 0;
> -
> -disable_msix:
> - pci_disable_msix(pdev);
> -free_entries:
> - kfree(xhci->msix_entries);
> - xhci->msix_entries = NULL;
> - return ret;
> -}
> -
> -/* XXX: code duplication; can xhci_setup_msix call this? */
> -/* Free any IRQs and disable MSI-X */
> -static void xhci_cleanup_msix(struct xhci_hcd *xhci)
> -{
> - struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> - if (!xhci->msix_entries)
> - return;
> -
> - free_irq(xhci->msix_entries[0].vector, xhci);
> - pci_disable_msix(pdev);
> - kfree(xhci->msix_entries);
> - xhci->msix_entries = NULL;
> - xhci_dbg(xhci, "Finished cleaning up MSI-X\n");
> -}
> -#endif
> -
> -/*
> - * Initialize memory for HCD and xHC (one-time init).
> - *
> - * Program the PAGESIZE register, initialize the device context array, create
> - * device contexts (?), set up a command ring segment (or two?), create event
> - * ring (one for now).
> - */
> -int xhci_init(struct usb_hcd *hcd)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - int retval = 0;
> -
> - xhci_dbg(xhci, "xhci_init\n");
> - spin_lock_init(&xhci->lock);
> - if (link_quirk) {
> - xhci_dbg(xhci, "QUIRK: Not clearing Link TRB chain bits.\n");
> - xhci->quirks |= XHCI_LINK_TRB_QUIRK;
> - } else {
> - xhci_dbg(xhci, "xHCI doesn't need link TRB QUIRK\n");
> - }
> - retval = xhci_mem_init(xhci, GFP_KERNEL);
> - xhci_dbg(xhci, "Finished xhci_init\n");
> -
> - return retval;
> -}
> -
> -/*
> - * Called in interrupt context when there might be work
> - * queued on the event ring
> - *
> - * xhci->lock must be held by caller.
> - */
> -static void xhci_work(struct xhci_hcd *xhci)
> -{
> - u32 temp;
> - u64 temp_64;
> -
> - /*
> - * Clear the op reg interrupt status first,
> - * so we can receive interrupts from other MSI-X interrupters.
> - * Write 1 to clear the interrupt status.
> - */
> - temp = xhci_readl(xhci, &xhci->op_regs->status);
> - temp |= STS_EINT;
> - xhci_writel(xhci, temp, &xhci->op_regs->status);
> - /* FIXME when MSI-X is supported and there are multiple vectors */
> - /* Clear the MSI-X event interrupt status */
> -
> - /* Acknowledge the interrupt */
> - temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> - temp |= 0x3;
> - xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
> - /* Flush posted writes */
> - xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -
> - if (xhci->xhc_state & XHCI_STATE_DYING)
> - xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
> - "Shouldn't IRQs be disabled?\n");
> - else
> - /* FIXME this should be a delayed service routine
> - * that clears the EHB.
> - */
> - xhci_handle_event(xhci);
> -
> - /* Clear the event handler busy flag (RW1C); the event ring should be empty. */
> - temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> - xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue);
> - /* Flush posted writes -- FIXME is this necessary? */
> - xhci_readl(xhci, &xhci->ir_set->irq_pending);
> -}
> -
> -/*-------------------------------------------------------------------------*/
> -
> -/*
> - * xHCI spec says we can get an interrupt, and if the HC has an error condition,
> - * we might get bad data out of the event ring. Section 4.10.2.7 has a list of
> - * indicators of an event TRB error, but we check the status *first* to be safe.
> - */
> -irqreturn_t xhci_irq(struct usb_hcd *hcd)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - u32 temp, temp2;
> - union xhci_trb *trb;
> -
> - spin_lock(&xhci->lock);
> - trb = xhci->event_ring->dequeue;
> - /* Check if the xHC generated the interrupt, or the irq is shared */
> - temp = xhci_readl(xhci, &xhci->op_regs->status);
> - temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> - if (temp == 0xffffffff && temp2 == 0xffffffff)
> - goto hw_died;
> -
> - if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
> - spin_unlock(&xhci->lock);
> - return IRQ_NONE;
> - }
> - xhci_dbg(xhci, "op reg status = %08x\n", temp);
> - xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2);
> - xhci_dbg(xhci, "Event ring dequeue ptr:\n");
> - xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
> - (unsigned long long)xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
> - lower_32_bits(trb->link.segment_ptr),
> - upper_32_bits(trb->link.segment_ptr),
> - (unsigned int) trb->link.intr_target,
> - (unsigned int) trb->link.control);
> -
> - if (temp & STS_FATAL) {
> - xhci_warn(xhci, "WARNING: Host System Error\n");
> - xhci_halt(xhci);
> -hw_died:
> - xhci_to_hcd(xhci)->state = HC_STATE_HALT;
> - spin_unlock(&xhci->lock);
> - return -ESHUTDOWN;
> - }
> -
> - xhci_work(xhci);
> - spin_unlock(&xhci->lock);
> -
> - return IRQ_HANDLED;
> -}
> -
> -#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> -void xhci_event_ring_work(unsigned long arg)
> -{
> - unsigned long flags;
> - int temp;
> - u64 temp_64;
> - struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
> - int i, j;
> -
> - xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
> -
> - spin_lock_irqsave(&xhci->lock, flags);
> - temp = xhci_readl(xhci, &xhci->op_regs->status);
> - xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
> - if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING)) {
> - xhci_dbg(xhci, "HW died, polling stopped.\n");
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - return;
> - }
> -
> - temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> - xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
> - xhci_dbg(xhci, "No-op commands handled = %d\n", xhci->noops_handled);
> - xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
> - xhci->error_bitmask = 0;
> - xhci_dbg(xhci, "Event ring:\n");
> - xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
> - xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
> - temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> - temp_64 &= ~ERST_PTR_MASK;
> - xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
> - xhci_dbg(xhci, "Command ring:\n");
> - xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
> - xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
> - xhci_dbg_cmd_ptrs(xhci);
> - for (i = 0; i < MAX_HC_SLOTS; ++i) {
> - if (!xhci->devs[i])
> - continue;
> - for (j = 0; j < 31; ++j) {
> - struct xhci_ring *ring = xhci->devs[i]->eps[j].ring;
> - if (!ring)
> - continue;
> - xhci_dbg(xhci, "Dev %d endpoint ring %d:\n", i, j);
> - xhci_debug_segment(xhci, ring->deq_seg);
> - }
> - }
> -
> - if (xhci->noops_submitted != NUM_TEST_NOOPS)
> - if (xhci_setup_one_noop(xhci))
> - xhci_ring_cmd_db(xhci);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> -
> - if (!xhci->zombie)
> - mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
> - else
> - xhci_dbg(xhci, "Quit polling the event ring.\n");
> -}
> -#endif
> -
> -/*
> - * Start the HC after it was halted.
> - *
> - * This function is called by the USB core when the HC driver is added.
> - * Its opposite is xhci_stop().
> - *
> - * xhci_init() must be called once before this function can be called.
> - * Reset the HC, enable device slot contexts, program DCBAAP, and
> - * set command ring pointer and event ring pointer.
> - *
> - * Setup MSI-X vectors and enable interrupts.
> - */
> -int xhci_run(struct usb_hcd *hcd)
> -{
> - u32 temp;
> - u64 temp_64;
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - void (*doorbell)(struct xhci_hcd *) = NULL;
> -
> - hcd->uses_new_polling = 1;
> - hcd->poll_rh = 0;
> -
> - xhci_dbg(xhci, "xhci_run\n");
> -#if 0 /* FIXME: MSI not setup yet */
> - /* Do this at the very last minute */
> - ret = xhci_setup_msix(xhci);
> - if (!ret)
> - return ret;
> -
> - return -ENOSYS;
> -#endif
> -#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> - init_timer(&xhci->event_ring_timer);
> - xhci->event_ring_timer.data = (unsigned long) xhci;
> - xhci->event_ring_timer.function = xhci_event_ring_work;
> - /* Poll the event ring */
> - xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
> - xhci->zombie = 0;
> - xhci_dbg(xhci, "Setting event ring polling timer\n");
> - add_timer(&xhci->event_ring_timer);
> -#endif
> -
> - xhci_dbg(xhci, "Command ring memory map follows:\n");
> - xhci_debug_ring(xhci, xhci->cmd_ring);
> - xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
> - xhci_dbg_cmd_ptrs(xhci);
> -
> - xhci_dbg(xhci, "ERST memory map follows:\n");
> - xhci_dbg_erst(xhci, &xhci->erst);
> - xhci_dbg(xhci, "Event ring:\n");
> - xhci_debug_ring(xhci, xhci->event_ring);
> - xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
> - temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> - temp_64 &= ~ERST_PTR_MASK;
> - xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
> -
> - xhci_dbg(xhci, "// Set the interrupt modulation register\n");
> - temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
> - temp &= ~ER_IRQ_INTERVAL_MASK;
> - temp |= (u32) 160;
> - xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
> -
> - /* Set the HCD state before we enable the irqs */
> - hcd->state = HC_STATE_RUNNING;
> - temp = xhci_readl(xhci, &xhci->op_regs->command);
> - temp |= (CMD_EIE);
> - xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
> - temp);
> - xhci_writel(xhci, temp, &xhci->op_regs->command);
> -
> - temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> - xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
> - xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
> - xhci_writel(xhci, ER_IRQ_ENABLE(temp),
> - &xhci->ir_set->irq_pending);
> - xhci_print_ir_set(xhci, xhci->ir_set, 0);
> -
> - if (NUM_TEST_NOOPS > 0)
> - doorbell = xhci_setup_one_noop(xhci);
> -
> - temp = xhci_readl(xhci, &xhci->op_regs->command);
> - temp |= (CMD_RUN);
> - xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
> - temp);
> - xhci_writel(xhci, temp, &xhci->op_regs->command);
> - /* Flush PCI posted writes */
> - temp = xhci_readl(xhci, &xhci->op_regs->command);
> - xhci_dbg(xhci, "// @%p = 0x%x\n", &xhci->op_regs->command, temp);
> - if (doorbell)
> - (*doorbell)(xhci);
> -
> - xhci_dbg(xhci, "Finished xhci_run\n");
> - return 0;
> -}
> -
> -/*
> - * Stop xHCI driver.
> - *
> - * This function is called by the USB core when the HC driver is removed.
> - * Its opposite is xhci_run().
> - *
> - * Disable device contexts, disable IRQs, and quiesce the HC.
> - * Reset the HC, finish any completed transactions, and cleanup memory.
> - */
> -void xhci_stop(struct usb_hcd *hcd)
> -{
> - u32 temp;
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -
> - spin_lock_irq(&xhci->lock);
> - xhci_halt(xhci);
> - xhci_reset(xhci);
> - spin_unlock_irq(&xhci->lock);
> -
> -#if 0 /* No MSI yet */
> - xhci_cleanup_msix(xhci);
> -#endif
> -#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> - /* Tell the event ring poll function not to reschedule */
> - xhci->zombie = 1;
> - del_timer_sync(&xhci->event_ring_timer);
> -#endif
> -
> - xhci_dbg(xhci, "// Disabling event ring interrupts\n");
> - temp = xhci_readl(xhci, &xhci->op_regs->status);
> - xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
> - temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> - xhci_writel(xhci, ER_IRQ_DISABLE(temp),
> - &xhci->ir_set->irq_pending);
> - xhci_print_ir_set(xhci, xhci->ir_set, 0);
> -
> - xhci_dbg(xhci, "cleaning up memory\n");
> - xhci_mem_cleanup(xhci);
> - xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
> - xhci_readl(xhci, &xhci->op_regs->status));
> -}
> -
> -/*
> - * Shutdown HC (not bus-specific)
> - *
> - * This is called when the machine is rebooting or halting. We assume that the
> - * machine will be powered off, and the HC's internal state will be reset.
> - * Don't bother to free memory.
> - */
> -void xhci_shutdown(struct usb_hcd *hcd)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> -
> - spin_lock_irq(&xhci->lock);
> - xhci_halt(xhci);
> - spin_unlock_irq(&xhci->lock);
> -
> -#if 0
> - xhci_cleanup_msix(xhci);
> -#endif
> -
> - xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
> - xhci_readl(xhci, &xhci->op_regs->status));
> -}
> -
> -/*-------------------------------------------------------------------------*/
> -
> -/**
> - * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
> - * HCDs. Find the index for an endpoint given its descriptor. Use the return
> - * value to right shift 1 for the bitmask.
> - *
> - * Index = (epnum * 2) + direction - 1,
> - * where direction = 0 for OUT, 1 for IN.
> - * For control endpoints, the IN index is used (OUT index is unused), so
> - * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
> - */
> -unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
> -{
> - unsigned int index;
> - if (usb_endpoint_xfer_control(desc))
> - index = (unsigned int) (usb_endpoint_num(desc)*2);
> - else
> - index = (unsigned int) (usb_endpoint_num(desc)*2) +
> - (usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
> - return index;
> -}
> -
> -/* Find the flag for this endpoint (for use in the control context). Use the
> - * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
> - * bit 1, etc.
> - */
> -unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
> -{
> - return 1 << (xhci_get_endpoint_index(desc) + 1);
> -}
> -
> -/* Find the flag for this endpoint (for use in the control context). Use the
> - * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
> - * bit 1, etc.
> - */
> -unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index)
> -{
> - return 1 << (ep_index + 1);
> -}
> -
> -/* Compute the last valid endpoint context index. Basically, this is the
> - * endpoint index plus one. For slot contexts with more than valid endpoint,
> - * we find the most significant bit set in the added contexts flags.
> - * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
> - * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
> - */
> -unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
> -{
> - return fls(added_ctxs) - 1;
> -}
> -
> -/* Returns 1 if the arguments are OK;
> - * returns 0 this is a root hub; returns -EINVAL for NULL pointers.
> - */
> -int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
> - struct usb_host_endpoint *ep, int check_ep, const char *func) {
> - if (!hcd || (check_ep && !ep) || !udev) {
> - printk(KERN_DEBUG "xHCI %s called with invalid args\n",
> - func);
> - return -EINVAL;
> - }
> - if (!udev->parent) {
> - printk(KERN_DEBUG "xHCI %s called for root hub\n",
> - func);
> - return 0;
> - }
> - if (!udev->slot_id) {
> - printk(KERN_DEBUG "xHCI %s called with unaddressed device\n",
> - func);
> - return -EINVAL;
> - }
> - return 1;
> -}
> -
> -static int xhci_configure_endpoint(struct xhci_hcd *xhci,
> - struct usb_device *udev, struct xhci_command *command,
> - bool ctx_change, bool must_succeed);
> -
> -/*
> - * Full speed devices may have a max packet size greater than 8 bytes, but the
> - * USB core doesn't know that until it reads the first 8 bytes of the
> - * descriptor. If the usb_device's max packet size changes after that point,
> - * we need to issue an evaluate context command and wait on it.
> - */
> -static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id,
> - unsigned int ep_index, struct urb *urb)
> -{
> - struct xhci_container_ctx *in_ctx;
> - struct xhci_container_ctx *out_ctx;
> - struct xhci_input_control_ctx *ctrl_ctx;
> - struct xhci_ep_ctx *ep_ctx;
> - int max_packet_size;
> - int hw_max_packet_size;
> - int ret = 0;
> -
> - out_ctx = xhci->devs[slot_id]->out_ctx;
> - ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> - hw_max_packet_size = MAX_PACKET_DECODED(ep_ctx->ep_info2);
> - max_packet_size = urb->dev->ep0.desc.wMaxPacketSize;
> - if (hw_max_packet_size != max_packet_size) {
> - xhci_dbg(xhci, "Max Packet Size for ep 0 changed.\n");
> - xhci_dbg(xhci, "Max packet size in usb_device = %d\n",
> - max_packet_size);
> - xhci_dbg(xhci, "Max packet size in xHCI HW = %d\n",
> - hw_max_packet_size);
> - xhci_dbg(xhci, "Issuing evaluate context command.\n");
> -
> - /* Set up the modified control endpoint 0 */
> - xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
> - xhci->devs[slot_id]->out_ctx, ep_index);
> - in_ctx = xhci->devs[slot_id]->in_ctx;
> - ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
> - ep_ctx->ep_info2 &= ~MAX_PACKET_MASK;
> - ep_ctx->ep_info2 |= MAX_PACKET(max_packet_size);
> -
> - /* Set up the input context flags for the command */
> - /* FIXME: This won't work if a non-default control endpoint
> - * changes max packet sizes.
> - */
> - ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> - ctrl_ctx->add_flags = EP0_FLAG;
> - ctrl_ctx->drop_flags = 0;
> -
> - xhci_dbg(xhci, "Slot %d input context\n", slot_id);
> - xhci_dbg_ctx(xhci, in_ctx, ep_index);
> - xhci_dbg(xhci, "Slot %d output context\n", slot_id);
> - xhci_dbg_ctx(xhci, out_ctx, ep_index);
> -
> - ret = xhci_configure_endpoint(xhci, urb->dev, NULL,
> - true, false);
> -
> - /* Clean up the input context for later use by bandwidth
> - * functions.
> - */
> - ctrl_ctx->add_flags = SLOT_FLAG;
> - }
> - return ret;
> -}
> -
> -/*
> - * non-error returns are a promise to giveback() the urb later
> - * we drop ownership so next owner (or urb unlink) can get it
> - */
> -int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - unsigned long flags;
> - int ret = 0;
> - unsigned int slot_id, ep_index;
> -
> -
> - if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, __func__) <= 0)
> - return -EINVAL;
> -
> - slot_id = urb->dev->slot_id;
> - ep_index = xhci_get_endpoint_index(&urb->ep->desc);
> -
> - if (!xhci->devs || !xhci->devs[slot_id]) {
> - if (!in_interrupt())
> - dev_warn(&urb->dev->dev, "WARN: urb submitted for dev with no Slot ID\n");
> - ret = -EINVAL;
> - goto exit;
> - }
> - if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
> - if (!in_interrupt())
> - xhci_dbg(xhci, "urb submitted during PCI suspend\n");
> - ret = -ESHUTDOWN;
> - goto exit;
> - }
> - if (usb_endpoint_xfer_control(&urb->ep->desc)) {
> - /* Check to see if the max packet size for the default control
> - * endpoint changed during FS device enumeration
> - */
> - if (urb->dev->speed == USB_SPEED_FULL) {
> - ret = xhci_check_maxpacket(xhci, slot_id,
> - ep_index, urb);
> - if (ret < 0)
> - return ret;
> - }
> -
> - /* We have a spinlock and interrupts disabled, so we must pass
> - * atomic context to this function, which may allocate memory.
> - */
> - spin_lock_irqsave(&xhci->lock, flags);
> - if (xhci->xhc_state & XHCI_STATE_DYING)
> - goto dying;
> - ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
> - slot_id, ep_index);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - } else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
> - spin_lock_irqsave(&xhci->lock, flags);
> - if (xhci->xhc_state & XHCI_STATE_DYING)
> - goto dying;
> - ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
> - slot_id, ep_index);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - } else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
> - spin_lock_irqsave(&xhci->lock, flags);
> - if (xhci->xhc_state & XHCI_STATE_DYING)
> - goto dying;
> - ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
> - slot_id, ep_index);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - } else {
> - ret = -EINVAL;
> - }
> -exit:
> - return ret;
> -dying:
> - xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "
> - "non-responsive xHCI host.\n",
> - urb->ep->desc.bEndpointAddress, urb);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - return -ESHUTDOWN;
> -}
> -
> -/*
> - * Remove the URB's TD from the endpoint ring. This may cause the HC to stop
> - * USB transfers, potentially stopping in the middle of a TRB buffer. The HC
> - * should pick up where it left off in the TD, unless a Set Transfer Ring
> - * Dequeue Pointer is issued.
> - *
> - * The TRBs that make up the buffers for the canceled URB will be "removed" from
> - * the ring. Since the ring is a contiguous structure, they can't be physically
> - * removed. Instead, there are two options:
> - *
> - * 1) If the HC is in the middle of processing the URB to be canceled, we
> - * simply move the ring's dequeue pointer past those TRBs using the Set
> - * Transfer Ring Dequeue Pointer command. This will be the common case,
> - * when drivers timeout on the last submitted URB and attempt to cancel.
> - *
> - * 2) If the HC is in the middle of a different TD, we turn the TRBs into a
> - * series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The
> - * HC will need to invalidate the any TRBs it has cached after the stop
> - * endpoint command, as noted in the xHCI 0.95 errata.
> - *
> - * 3) The TD may have completed by the time the Stop Endpoint Command
> - * completes, so software needs to handle that case too.
> - *
> - * This function should protect against the TD enqueueing code ringing the
> - * doorbell while this code is waiting for a Stop Endpoint command to complete.
> - * It also needs to account for multiple cancellations on happening at the same
> - * time for the same endpoint.
> - *
> - * Note that this function can be called in any context, or so says
> - * usb_hcd_unlink_urb()
> - */
> -int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
> -{
> - unsigned long flags;
> - int ret;
> - u32 temp;
> - struct xhci_hcd *xhci;
> - struct xhci_td *td;
> - unsigned int ep_index;
> - struct xhci_ring *ep_ring;
> - struct xhci_virt_ep *ep;
> -
> - xhci = hcd_to_xhci(hcd);
> - spin_lock_irqsave(&xhci->lock, flags);
> - /* Make sure the URB hasn't completed or been unlinked already */
> - ret = usb_hcd_check_unlink_urb(hcd, urb, status);
> - if (ret || !urb->hcpriv)
> - goto done;
> - temp = xhci_readl(xhci, &xhci->op_regs->status);
> - if (temp == 0xffffffff) {
> - xhci_dbg(xhci, "HW died, freeing TD.\n");
> - td = (struct xhci_td *) urb->hcpriv;
> -
> - usb_hcd_unlink_urb_from_ep(hcd, urb);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, -ESHUTDOWN);
> - kfree(td);
> - return ret;
> - }
> - if (xhci->xhc_state & XHCI_STATE_DYING) {
> - xhci_dbg(xhci, "Ep 0x%x: URB %p to be canceled on "
> - "non-responsive xHCI host.\n",
> - urb->ep->desc.bEndpointAddress, urb);
> - /* Let the stop endpoint command watchdog timer (which set this
> - * state) finish cleaning up the endpoint TD lists. We must
> - * have caught it in the middle of dropping a lock and giving
> - * back an URB.
> - */
> - goto done;
> - }
> -
> - xhci_dbg(xhci, "Cancel URB %p\n", urb);
> - xhci_dbg(xhci, "Event ring:\n");
> - xhci_debug_ring(xhci, xhci->event_ring);
> - ep_index = xhci_get_endpoint_index(&urb->ep->desc);
> - ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
> - ep_ring = ep->ring;
> - xhci_dbg(xhci, "Endpoint ring:\n");
> - xhci_debug_ring(xhci, ep_ring);
> - td = (struct xhci_td *) urb->hcpriv;
> -
> - list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
> - /* Queue a stop endpoint command, but only if this is
> - * the first cancellation to be handled.
> - */
> - if (!(ep->ep_state & EP_HALT_PENDING)) {
> - ep->ep_state |= EP_HALT_PENDING;
> - ep->stop_cmds_pending++;
> - ep->stop_cmd_timer.expires = jiffies +
> - XHCI_STOP_EP_CMD_TIMEOUT * HZ;
> - add_timer(&ep->stop_cmd_timer);
> - xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index);
> - xhci_ring_cmd_db(xhci);
> - }
> -done:
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - return ret;
> -}
> -
> -/* Drop an endpoint from a new bandwidth configuration for this device.
> - * Only one call to this function is allowed per endpoint before
> - * check_bandwidth() or reset_bandwidth() must be called.
> - * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
> - * add the endpoint to the schedule with possibly new parameters denoted by a
> - * different endpoint descriptor in usb_host_endpoint.
> - * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
> - * not allowed.
> - *
> - * The USB core will not allow URBs to be queued to an endpoint that is being
> - * disabled, so there's no need for mutual exclusion to protect
> - * the xhci->devs[slot_id] structure.
> - */
> -int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> - struct usb_host_endpoint *ep)
> -{
> - struct xhci_hcd *xhci;
> - struct xhci_container_ctx *in_ctx, *out_ctx;
> - struct xhci_input_control_ctx *ctrl_ctx;
> - struct xhci_slot_ctx *slot_ctx;
> - unsigned int last_ctx;
> - unsigned int ep_index;
> - struct xhci_ep_ctx *ep_ctx;
> - u32 drop_flag;
> - u32 new_add_flags, new_drop_flags, new_slot_info;
> - int ret;
> -
> - ret = xhci_check_args(hcd, udev, ep, 1, __func__);
> - if (ret <= 0)
> - return ret;
> - xhci = hcd_to_xhci(hcd);
> - xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> -
> - drop_flag = xhci_get_endpoint_flag(&ep->desc);
> - if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
> - xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
> - __func__, drop_flag);
> - return 0;
> - }
> -
> - if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> - xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> - __func__);
> - return -EINVAL;
> - }
> -
> - in_ctx = xhci->devs[udev->slot_id]->in_ctx;
> - out_ctx = xhci->devs[udev->slot_id]->out_ctx;
> - ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> - ep_index = xhci_get_endpoint_index(&ep->desc);
> - ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> - /* If the HC already knows the endpoint is disabled,
> - * or the HCD has noted it is disabled, ignore this request
> - */
> - if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED ||
> - ctrl_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) {
> - xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
> - __func__, ep);
> - return 0;
> - }
> -
> - ctrl_ctx->drop_flags |= drop_flag;
> - new_drop_flags = ctrl_ctx->drop_flags;
> -
> - ctrl_ctx->add_flags &= ~drop_flag;
> - new_add_flags = ctrl_ctx->add_flags;
> -
> - last_ctx = xhci_last_valid_endpoint(ctrl_ctx->add_flags);
> - slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
> - /* Update the last valid endpoint context, if we deleted the last one */
> - if ((slot_ctx->dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) {
> - slot_ctx->dev_info &= ~LAST_CTX_MASK;
> - slot_ctx->dev_info |= LAST_CTX(last_ctx);
> - }
> - new_slot_info = slot_ctx->dev_info;
> -
> - xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
> -
> - xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
> - (unsigned int) ep->desc.bEndpointAddress,
> - udev->slot_id,
> - (unsigned int) new_drop_flags,
> - (unsigned int) new_add_flags,
> - (unsigned int) new_slot_info);
> - return 0;
> -}
> -
> -/* Add an endpoint to a new possible bandwidth configuration for this device.
> - * Only one call to this function is allowed per endpoint before
> - * check_bandwidth() or reset_bandwidth() must be called.
> - * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
> - * add the endpoint to the schedule with possibly new parameters denoted by a
> - * different endpoint descriptor in usb_host_endpoint.
> - * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
> - * not allowed.
> - *
> - * The USB core will not allow URBs to be queued to an endpoint until the
> - * configuration or alt setting is installed in the device, so there's no need
> - * for mutual exclusion to protect the xhci->devs[slot_id] structure.
> - */
> -int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> - struct usb_host_endpoint *ep)
> -{
> - struct xhci_hcd *xhci;
> - struct xhci_container_ctx *in_ctx, *out_ctx;
> - unsigned int ep_index;
> - struct xhci_ep_ctx *ep_ctx;
> - struct xhci_slot_ctx *slot_ctx;
> - struct xhci_input_control_ctx *ctrl_ctx;
> - u32 added_ctxs;
> - unsigned int last_ctx;
> - u32 new_add_flags, new_drop_flags, new_slot_info;
> - int ret = 0;
> -
> - ret = xhci_check_args(hcd, udev, ep, 1, __func__);
> - if (ret <= 0) {
> - /* So we won't queue a reset ep command for a root hub */
> - ep->hcpriv = NULL;
> - return ret;
> - }
> - xhci = hcd_to_xhci(hcd);
> -
> - added_ctxs = xhci_get_endpoint_flag(&ep->desc);
> - last_ctx = xhci_last_valid_endpoint(added_ctxs);
> - if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
> - /* FIXME when we have to issue an evaluate endpoint command to
> - * deal with ep0 max packet size changing once we get the
> - * descriptors
> - */
> - xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
> - __func__, added_ctxs);
> - return 0;
> - }
> -
> - if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> - xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> - __func__);
> - return -EINVAL;
> - }
> -
> - in_ctx = xhci->devs[udev->slot_id]->in_ctx;
> - out_ctx = xhci->devs[udev->slot_id]->out_ctx;
> - ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> - ep_index = xhci_get_endpoint_index(&ep->desc);
> - ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> - /* If the HCD has already noted the endpoint is enabled,
> - * ignore this request.
> - */
> - if (ctrl_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) {
> - xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
> - __func__, ep);
> - return 0;
> - }
> -
> - /*
> - * Configuration and alternate setting changes must be done in
> - * process context, not interrupt context (or so documenation
> - * for usb_set_interface() and usb_set_configuration() claim).
> - */
> - if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id],
> - udev, ep, GFP_NOIO) < 0) {
> - dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
> - __func__, ep->desc.bEndpointAddress);
> - return -ENOMEM;
> - }
> -
> - ctrl_ctx->add_flags |= added_ctxs;
> - new_add_flags = ctrl_ctx->add_flags;
> -
> - /* If xhci_endpoint_disable() was called for this endpoint, but the
> - * xHC hasn't been notified yet through the check_bandwidth() call,
> - * this re-adds a new state for the endpoint from the new endpoint
> - * descriptors. We must drop and re-add this endpoint, so we leave the
> - * drop flags alone.
> - */
> - new_drop_flags = ctrl_ctx->drop_flags;
> -
> - slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
> - /* Update the last valid endpoint context, if we just added one past */
> - if ((slot_ctx->dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) {
> - slot_ctx->dev_info &= ~LAST_CTX_MASK;
> - slot_ctx->dev_info |= LAST_CTX(last_ctx);
> - }
> - new_slot_info = slot_ctx->dev_info;
> -
> - /* Store the usb_device pointer for later use */
> - ep->hcpriv = udev;
> -
> - xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
> - (unsigned int) ep->desc.bEndpointAddress,
> - udev->slot_id,
> - (unsigned int) new_drop_flags,
> - (unsigned int) new_add_flags,
> - (unsigned int) new_slot_info);
> - return 0;
> -}
> -
> -static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev)
> -{
> - struct xhci_input_control_ctx *ctrl_ctx;
> - struct xhci_ep_ctx *ep_ctx;
> - struct xhci_slot_ctx *slot_ctx;
> - int i;
> -
> - /* When a device's add flag and drop flag are zero, any subsequent
> - * configure endpoint command will leave that endpoint's state
> - * untouched. Make sure we don't leave any old state in the input
> - * endpoint contexts.
> - */
> - ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> - ctrl_ctx->drop_flags = 0;
> - ctrl_ctx->add_flags = 0;
> - slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
> - slot_ctx->dev_info &= ~LAST_CTX_MASK;
> - /* Endpoint 0 is always valid */
> - slot_ctx->dev_info |= LAST_CTX(1);
> - for (i = 1; i < 31; ++i) {
> - ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i);
> - ep_ctx->ep_info = 0;
> - ep_ctx->ep_info2 = 0;
> - ep_ctx->deq = 0;
> - ep_ctx->tx_info = 0;
> - }
> -}
> -
> -static int xhci_configure_endpoint_result(struct xhci_hcd *xhci,
> - struct usb_device *udev, int *cmd_status)
> -{
> - int ret;
> -
> - switch (*cmd_status) {
> - case COMP_ENOMEM:
> - dev_warn(&udev->dev, "Not enough host controller resources "
> - "for new device state.\n");
> - ret = -ENOMEM;
> - /* FIXME: can we allocate more resources for the HC? */
> - break;
> - case COMP_BW_ERR:
> - dev_warn(&udev->dev, "Not enough bandwidth "
> - "for new device state.\n");
> - ret = -ENOSPC;
> - /* FIXME: can we go back to the old state? */
> - break;
> - case COMP_TRB_ERR:
> - /* the HCD set up something wrong */
> - dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, "
> - "add flag = 1, "
> - "and endpoint is not disabled.\n");
> - ret = -EINVAL;
> - break;
> - case COMP_SUCCESS:
> - dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
> - ret = 0;
> - break;
> - default:
> - xhci_err(xhci, "ERROR: unexpected command completion "
> - "code 0x%x.\n", *cmd_status);
> - ret = -EINVAL;
> - break;
> - }
> - return ret;
> -}
> -
> -static int xhci_evaluate_context_result(struct xhci_hcd *xhci,
> - struct usb_device *udev, int *cmd_status)
> -{
> - int ret;
> - struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
> -
> - switch (*cmd_status) {
> - case COMP_EINVAL:
> - dev_warn(&udev->dev, "WARN: xHCI driver setup invalid evaluate "
> - "context command.\n");
> - ret = -EINVAL;
> - break;
> - case COMP_EBADSLT:
> - dev_warn(&udev->dev, "WARN: slot not enabled for"
> - "evaluate context command.\n");
> - case COMP_CTX_STATE:
> - dev_warn(&udev->dev, "WARN: invalid context state for "
> - "evaluate context command.\n");
> - xhci_dbg_ctx(xhci, virt_dev->out_ctx, 1);
> - ret = -EINVAL;
> - break;
> - case COMP_SUCCESS:
> - dev_dbg(&udev->dev, "Successful evaluate context command\n");
> - ret = 0;
> - break;
> - default:
> - xhci_err(xhci, "ERROR: unexpected command completion "
> - "code 0x%x.\n", *cmd_status);
> - ret = -EINVAL;
> - break;
> - }
> - return ret;
> -}
> -
> -/* Issue a configure endpoint command or evaluate context command
> - * and wait for it to finish.
> - */
> -static int xhci_configure_endpoint(struct xhci_hcd *xhci,
> - struct usb_device *udev,
> - struct xhci_command *command,
> - bool ctx_change, bool must_succeed)
> -{
> - int ret;
> - int timeleft;
> - unsigned long flags;
> - struct xhci_container_ctx *in_ctx;
> - struct completion *cmd_completion;
> - int *cmd_status;
> - struct xhci_virt_device *virt_dev;
> -
> - spin_lock_irqsave(&xhci->lock, flags);
> - virt_dev = xhci->devs[udev->slot_id];
> - if (command) {
> - in_ctx = command->in_ctx;
> - cmd_completion = command->completion;
> - cmd_status = &command->status;
> - command->command_trb = xhci->cmd_ring->enqueue;
> - list_add_tail(&command->cmd_list, &virt_dev->cmd_list);
> - } else {
> - in_ctx = virt_dev->in_ctx;
> - cmd_completion = &virt_dev->cmd_completion;
> - cmd_status = &virt_dev->cmd_status;
> - }
> -
> - if (!ctx_change)
> - ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma,
> - udev->slot_id, must_succeed);
> - else
> - ret = xhci_queue_evaluate_context(xhci, in_ctx->dma,
> - udev->slot_id);
> - if (ret < 0) {
> - if (command)
> - list_del(&command->cmd_list);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
> - return -ENOMEM;
> - }
> - xhci_ring_cmd_db(xhci);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> -
> - /* Wait for the configure endpoint command to complete */
> - timeleft = wait_for_completion_interruptible_timeout(
> - cmd_completion,
> - USB_CTRL_SET_TIMEOUT);
> - if (timeleft <= 0) {
> - xhci_warn(xhci, "%s while waiting for %s command\n",
> - timeleft == 0 ? "Timeout" : "Signal",
> - ctx_change == 0 ?
> - "configure endpoint" :
> - "evaluate context");
> - /* FIXME cancel the configure endpoint command */
> - return -ETIME;
> - }
> -
> - if (!ctx_change)
> - return xhci_configure_endpoint_result(xhci, udev, cmd_status);
> - return xhci_evaluate_context_result(xhci, udev, cmd_status);
> -}
> -
> -/* Called after one or more calls to xhci_add_endpoint() or
> - * xhci_drop_endpoint(). If this call fails, the USB core is expected
> - * to call xhci_reset_bandwidth().
> - *
> - * Since we are in the middle of changing either configuration or
> - * installing a new alt setting, the USB core won't allow URBs to be
> - * enqueued for any endpoint on the old config or interface. Nothing
> - * else should be touching the xhci->devs[slot_id] structure, so we
> - * don't need to take the xhci->lock for manipulating that.
> - */
> -int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> - int i;
> - int ret = 0;
> - struct xhci_hcd *xhci;
> - struct xhci_virt_device *virt_dev;
> - struct xhci_input_control_ctx *ctrl_ctx;
> - struct xhci_slot_ctx *slot_ctx;
> -
> - ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> - if (ret <= 0)
> - return ret;
> - xhci = hcd_to_xhci(hcd);
> -
> - if (!udev->slot_id || !xhci->devs || !xhci->devs[udev->slot_id]) {
> - xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> - __func__);
> - return -EINVAL;
> - }
> - xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> - virt_dev = xhci->devs[udev->slot_id];
> -
> - /* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
> - ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> - ctrl_ctx->add_flags |= SLOT_FLAG;
> - ctrl_ctx->add_flags &= ~EP0_FLAG;
> - ctrl_ctx->drop_flags &= ~SLOT_FLAG;
> - ctrl_ctx->drop_flags &= ~EP0_FLAG;
> - xhci_dbg(xhci, "New Input Control Context:\n");
> - slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
> - xhci_dbg_ctx(xhci, virt_dev->in_ctx,
> - LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
> -
> - ret = xhci_configure_endpoint(xhci, udev, NULL,
> - false, false);
> - if (ret) {
> - /* Callee should call reset_bandwidth() */
> - return ret;
> - }
> -
> - xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
> - xhci_dbg_ctx(xhci, virt_dev->out_ctx,
> - LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
> -
> - xhci_zero_in_ctx(xhci, virt_dev);
> - /* Install new rings and free or cache any old rings */
> - for (i = 1; i < 31; ++i) {
> - if (!virt_dev->eps[i].new_ring)
> - continue;
> - /* Only cache or free the old ring if it exists.
> - * It may not if this is the first add of an endpoint.
> - */
> - if (virt_dev->eps[i].ring) {
> - xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
> - }
> - virt_dev->eps[i].ring = virt_dev->eps[i].new_ring;
> - virt_dev->eps[i].new_ring = NULL;
> - }
> -
> - return ret;
> -}
> -
> -void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> - struct xhci_hcd *xhci;
> - struct xhci_virt_device *virt_dev;
> - int i, ret;
> -
> - ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> - if (ret <= 0)
> - return;
> - xhci = hcd_to_xhci(hcd);
> -
> - if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> - xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> - __func__);
> - return;
> - }
> - xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> - virt_dev = xhci->devs[udev->slot_id];
> - /* Free any rings allocated for added endpoints */
> - for (i = 0; i < 31; ++i) {
> - if (virt_dev->eps[i].new_ring) {
> - xhci_ring_free(xhci, virt_dev->eps[i].new_ring);
> - virt_dev->eps[i].new_ring = NULL;
> - }
> - }
> - xhci_zero_in_ctx(xhci, virt_dev);
> -}
> -
> -static void xhci_setup_input_ctx_for_config_ep(struct xhci_hcd *xhci,
> - struct xhci_container_ctx *in_ctx,
> - struct xhci_container_ctx *out_ctx,
> - u32 add_flags, u32 drop_flags)
> -{
> - struct xhci_input_control_ctx *ctrl_ctx;
> - ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> - ctrl_ctx->add_flags = add_flags;
> - ctrl_ctx->drop_flags = drop_flags;
> - xhci_slot_copy(xhci, in_ctx, out_ctx);
> - ctrl_ctx->add_flags |= SLOT_FLAG;
> -
> - xhci_dbg(xhci, "Input Context:\n");
> - xhci_dbg_ctx(xhci, in_ctx, xhci_last_valid_endpoint(add_flags));
> -}
> -
> -void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci,
> - unsigned int slot_id, unsigned int ep_index,
> - struct xhci_dequeue_state *deq_state)
> -{
> - struct xhci_container_ctx *in_ctx;
> - struct xhci_ep_ctx *ep_ctx;
> - u32 added_ctxs;
> - dma_addr_t addr;
> -
> - xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
> - xhci->devs[slot_id]->out_ctx, ep_index);
> - in_ctx = xhci->devs[slot_id]->in_ctx;
> - ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
> - addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg,
> - deq_state->new_deq_ptr);
> - if (addr == 0) {
> - xhci_warn(xhci, "WARN Cannot submit config ep after "
> - "reset ep command\n");
> - xhci_warn(xhci, "WARN deq seg = %p, deq ptr = %p\n",
> - deq_state->new_deq_seg,
> - deq_state->new_deq_ptr);
> - return;
> - }
> - ep_ctx->deq = addr | deq_state->new_cycle_state;
> -
> - added_ctxs = xhci_get_endpoint_flag_from_index(ep_index);
> - xhci_setup_input_ctx_for_config_ep(xhci, xhci->devs[slot_id]->in_ctx,
> - xhci->devs[slot_id]->out_ctx, added_ctxs, added_ctxs);
> -}
> -
> -void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
> - struct usb_device *udev, unsigned int ep_index)
> -{
> - struct xhci_dequeue_state deq_state;
> - struct xhci_virt_ep *ep;
> -
> - xhci_dbg(xhci, "Cleaning up stalled endpoint ring\n");
> - ep = &xhci->devs[udev->slot_id]->eps[ep_index];
> - /* We need to move the HW's dequeue pointer past this TD,
> - * or it will attempt to resend it on the next doorbell ring.
> - */
> - xhci_find_new_dequeue_state(xhci, udev->slot_id,
> - ep_index, ep->stopped_td,
> - &deq_state);
> -
> - /* HW with the reset endpoint quirk will use the saved dequeue state to
> - * issue a configure endpoint command later.
> - */
> - if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) {
> - xhci_dbg(xhci, "Queueing new dequeue state\n");
> - xhci_queue_new_dequeue_state(xhci, udev->slot_id,
> - ep_index, &deq_state);
> - } else {
> - /* Better hope no one uses the input context between now and the
> - * reset endpoint completion!
> - */
> - xhci_dbg(xhci, "Setting up input context for "
> - "configure endpoint command\n");
> - xhci_setup_input_ctx_for_quirk(xhci, udev->slot_id,
> - ep_index, &deq_state);
> - }
> -}
> -
> -/* Deal with stalled endpoints. The core should have sent the control message
> - * to clear the halt condition. However, we need to make the xHCI hardware
> - * reset its sequence number, since a device will expect a sequence number of
> - * zero after the halt condition is cleared.
> - * Context: in_interrupt
> - */
> -void xhci_endpoint_reset(struct usb_hcd *hcd,
> - struct usb_host_endpoint *ep)
> -{
> - struct xhci_hcd *xhci;
> - struct usb_device *udev;
> - unsigned int ep_index;
> - unsigned long flags;
> - int ret;
> - struct xhci_virt_ep *virt_ep;
> -
> - xhci = hcd_to_xhci(hcd);
> - udev = (struct usb_device *) ep->hcpriv;
> - /* Called with a root hub endpoint (or an endpoint that wasn't added
> - * with xhci_add_endpoint()
> - */
> - if (!ep->hcpriv)
> - return;
> - ep_index = xhci_get_endpoint_index(&ep->desc);
> - virt_ep = &xhci->devs[udev->slot_id]->eps[ep_index];
> - if (!virt_ep->stopped_td) {
> - xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
> - ep->desc.bEndpointAddress);
> - return;
> - }
> - if (usb_endpoint_xfer_control(&ep->desc)) {
> - xhci_dbg(xhci, "Control endpoint stall already handled.\n");
> - return;
> - }
> -
> - xhci_dbg(xhci, "Queueing reset endpoint command\n");
> - spin_lock_irqsave(&xhci->lock, flags);
> - ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
> - /*
> - * Can't change the ring dequeue pointer until it's transitioned to the
> - * stopped state, which is only upon a successful reset endpoint
> - * command. Better hope that last command worked!
> - */
> - if (!ret) {
> - xhci_cleanup_stalled_ring(xhci, udev, ep_index);
> - kfree(virt_ep->stopped_td);
> - xhci_ring_cmd_db(xhci);
> - }
> - spin_unlock_irqrestore(&xhci->lock, flags);
> -
> - if (ret)
> - xhci_warn(xhci, "FIXME allocate a new ring segment\n");
> -}
> -
> -/*
> - * This submits a Reset Device Command, which will set the device state to 0,
> - * set the device address to 0, and disable all the endpoints except the default
> - * control endpoint. The USB core should come back and call
> - * xhci_address_device(), and then re-set up the configuration. If this is
> - * called because of a usb_reset_and_verify_device(), then the old alternate
> - * settings will be re-installed through the normal bandwidth allocation
> - * functions.
> - *
> - * Wait for the Reset Device command to finish. Remove all structures
> - * associated with the endpoints that were disabled. Clear the input device
> - * structure? Cache the rings? Reset the control endpoint 0 max packet size?
> - */
> -int xhci_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> - int ret, i;
> - unsigned long flags;
> - struct xhci_hcd *xhci;
> - unsigned int slot_id;
> - struct xhci_virt_device *virt_dev;
> - struct xhci_command *reset_device_cmd;
> - int timeleft;
> - int last_freed_endpoint;
> -
> - ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> - if (ret <= 0)
> - return ret;
> - xhci = hcd_to_xhci(hcd);
> - slot_id = udev->slot_id;
> - virt_dev = xhci->devs[slot_id];
> - if (!virt_dev) {
> - xhci_dbg(xhci, "%s called with invalid slot ID %u\n",
> - __func__, slot_id);
> - return -EINVAL;
> - }
> -
> - xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id);
> - /* Allocate the command structure that holds the struct completion.
> - * Assume we're in process context, since the normal device reset
> - * process has to wait for the device anyway. Storage devices are
> - * reset as part of error handling, so use GFP_NOIO instead of
> - * GFP_KERNEL.
> - */
> - reset_device_cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
> - if (!reset_device_cmd) {
> - xhci_dbg(xhci, "Couldn't allocate command structure.\n");
> - return -ENOMEM;
> - }
> -
> - /* Attempt to submit the Reset Device command to the command ring */
> - spin_lock_irqsave(&xhci->lock, flags);
> - reset_device_cmd->command_trb = xhci->cmd_ring->enqueue;
> - list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list);
> - ret = xhci_queue_reset_device(xhci, slot_id);
> - if (ret) {
> - xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> - list_del(&reset_device_cmd->cmd_list);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - goto command_cleanup;
> - }
> - xhci_ring_cmd_db(xhci);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> -
> - /* Wait for the Reset Device command to finish */
> - timeleft = wait_for_completion_interruptible_timeout(
> - reset_device_cmd->completion,
> - USB_CTRL_SET_TIMEOUT);
> - if (timeleft <= 0) {
> - xhci_warn(xhci, "%s while waiting for reset device command\n",
> - timeleft == 0 ? "Timeout" : "Signal");
> - spin_lock_irqsave(&xhci->lock, flags);
> - /* The timeout might have raced with the event ring handler, so
> - * only delete from the list if the item isn't poisoned.
> - */
> - if (reset_device_cmd->cmd_list.next != LIST_POISON1)
> - list_del(&reset_device_cmd->cmd_list);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - ret = -ETIME;
> - goto command_cleanup;
> - }
> -
> - /* The Reset Device command can't fail, according to the 0.95/0.96 spec,
> - * unless we tried to reset a slot ID that wasn't enabled,
> - * or the device wasn't in the addressed or configured state.
> - */
> - ret = reset_device_cmd->status;
> - switch (ret) {
> - case COMP_EBADSLT: /* 0.95 completion code for bad slot ID */
> - case COMP_CTX_STATE: /* 0.96 completion code for same thing */
> - xhci_info(xhci, "Can't reset device (slot ID %u) in %s state\n",
> - slot_id,
> - xhci_get_slot_state(xhci, virt_dev->out_ctx));
> - xhci_info(xhci, "Not freeing device rings.\n");
> - /* Don't treat this as an error. May change my mind later. */
> - ret = 0;
> - goto command_cleanup;
> - case COMP_SUCCESS:
> - xhci_dbg(xhci, "Successful reset device command.\n");
> - break;
> - default:
> - if (xhci_is_vendor_info_code(xhci, ret))
> - break;
> - xhci_warn(xhci, "Unknown completion code %u for "
> - "reset device command.\n", ret);
> - ret = -EINVAL;
> - goto command_cleanup;
> - }
> -
> - /* Everything but endpoint 0 is disabled, so free or cache the rings. */
> - last_freed_endpoint = 1;
> - for (i = 1; i < 31; ++i) {
> - if (!virt_dev->eps[i].ring)
> - continue;
> - xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
> - last_freed_endpoint = i;
> - }
> - xhci_dbg(xhci, "Output context after successful reset device cmd:\n");
> - xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint);
> - ret = 0;
> -
> -command_cleanup:
> - xhci_free_command(xhci, reset_device_cmd);
> - return ret;
> -}
> -
> -/*
> - * At this point, the struct usb_device is about to go away, the device has
> - * disconnected, and all traffic has been stopped and the endpoints have been
> - * disabled. Free any HC data structures associated with that device.
> - */
> -void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - struct xhci_virt_device *virt_dev;
> - unsigned long flags;
> - u32 state;
> - int i;
> -
> - if (udev->slot_id == 0)
> - return;
> - virt_dev = xhci->devs[udev->slot_id];
> - if (!virt_dev)
> - return;
> -
> - /* Stop any wayward timer functions (which may grab the lock) */
> - for (i = 0; i < 31; ++i) {
> - virt_dev->eps[i].ep_state &= ~EP_HALT_PENDING;
> - del_timer_sync(&virt_dev->eps[i].stop_cmd_timer);
> - }
> -
> - spin_lock_irqsave(&xhci->lock, flags);
> - /* Don't disable the slot if the host controller is dead. */
> - state = xhci_readl(xhci, &xhci->op_regs->status);
> - if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING)) {
> - xhci_free_virt_device(xhci, udev->slot_id);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - return;
> - }
> -
> - if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> - return;
> - }
> - xhci_ring_cmd_db(xhci);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - /*
> - * Event command completion handler will free any data structures
> - * associated with the slot. XXX Can free sleep?
> - */
> -}
> -
> -/*
> - * Returns 0 if the xHC ran out of device slots, the Enable Slot command
> - * timed out, or allocating memory failed. Returns 1 on success.
> - */
> -int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - unsigned long flags;
> - int timeleft;
> - int ret;
> -
> - spin_lock_irqsave(&xhci->lock, flags);
> - ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
> - if (ret) {
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> - return 0;
> - }
> - xhci_ring_cmd_db(xhci);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> -
> - /* XXX: how much time for xHC slot assignment? */
> - timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
> - USB_CTRL_SET_TIMEOUT);
> - if (timeleft <= 0) {
> - xhci_warn(xhci, "%s while waiting for a slot\n",
> - timeleft == 0 ? "Timeout" : "Signal");
> - /* FIXME cancel the enable slot request */
> - return 0;
> - }
> -
> - if (!xhci->slot_id) {
> - xhci_err(xhci, "Error while assigning device slot ID\n");
> - return 0;
> - }
> - /* xhci_alloc_virt_device() does not touch rings; no need to lock */
> - if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_KERNEL)) {
> - /* Disable slot, if we can do it without mem alloc */
> - xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
> - spin_lock_irqsave(&xhci->lock, flags);
> - if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
> - xhci_ring_cmd_db(xhci);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - return 0;
> - }
> - udev->slot_id = xhci->slot_id;
> - /* Is this a LS or FS device under a HS hub? */
> - /* Hub or peripherial? */
> - return 1;
> -}
> -
> -/*
> - * Issue an Address Device command (which will issue a SetAddress request to
> - * the device).
> - * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
> - * we should only issue and wait on one address command at the same time.
> - *
> - * We add one to the device address issued by the hardware because the USB core
> - * uses address 1 for the root hubs (even though they're not really devices).
> - */
> -int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
> -{
> - unsigned long flags;
> - int timeleft;
> - struct xhci_virt_device *virt_dev;
> - int ret = 0;
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - struct xhci_slot_ctx *slot_ctx;
> - struct xhci_input_control_ctx *ctrl_ctx;
> - u64 temp_64;
> -
> - if (!udev->slot_id) {
> - xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
> - return -EINVAL;
> - }
> -
> - virt_dev = xhci->devs[udev->slot_id];
> -
> - /* If this is a Set Address to an unconfigured device, setup ep 0 */
> - if (!udev->config)
> - xhci_setup_addressable_virt_dev(xhci, udev);
> - /* Otherwise, assume the core has the device configured how it wants */
> - xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
> - xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
> -
> - spin_lock_irqsave(&xhci->lock, flags);
> - ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma,
> - udev->slot_id);
> - if (ret) {
> - spin_unlock_irqrestore(&xhci->lock, flags);
> - xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> - return ret;
> - }
> - xhci_ring_cmd_db(xhci);
> - spin_unlock_irqrestore(&xhci->lock, flags);
> -
> - /* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
> - timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
> - USB_CTRL_SET_TIMEOUT);
> - /* FIXME: From section 4.3.4: "Software shall be responsible for timing
> - * the SetAddress() "recovery interval" required by USB and aborting the
> - * command on a timeout.
> - */
> - if (timeleft <= 0) {
> - xhci_warn(xhci, "%s while waiting for a slot\n",
> - timeleft == 0 ? "Timeout" : "Signal");
> - /* FIXME cancel the address device command */
> - return -ETIME;
> - }
> -
> - switch (virt_dev->cmd_status) {
> - case COMP_CTX_STATE:
> - case COMP_EBADSLT:
> - xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
> - udev->slot_id);
> - ret = -EINVAL;
> - break;
> - case COMP_TX_ERR:
> - dev_warn(&udev->dev, "Device not responding to set address.\n");
> - ret = -EPROTO;
> - break;
> - case COMP_SUCCESS:
> - xhci_dbg(xhci, "Successful Address Device command\n");
> - break;
> - default:
> - xhci_err(xhci, "ERROR: unexpected command completion "
> - "code 0x%x.\n", virt_dev->cmd_status);
> - xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
> - xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
> - ret = -EINVAL;
> - break;
> - }
> - if (ret) {
> - return ret;
> - }
> - temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
> - xhci_dbg(xhci, "Op regs DCBAA ptr = %#016llx\n", temp_64);
> - xhci_dbg(xhci, "Slot ID %d dcbaa entry @%p = %#016llx\n",
> - udev->slot_id,
> - &xhci->dcbaa->dev_context_ptrs[udev->slot_id],
> - (unsigned long long)
> - xhci->dcbaa->dev_context_ptrs[udev->slot_id]);
> - xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
> - (unsigned long long)virt_dev->out_ctx->dma);
> - xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
> - xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
> - xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
> - xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
> - /*
> - * USB core uses address 1 for the roothubs, so we add one to the
> - * address given back to us by the HC.
> - */
> - slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
> - udev->devnum = (slot_ctx->dev_state & DEV_ADDR_MASK) + 1;
> - /* Zero the input context control for later use */
> - ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> - ctrl_ctx->add_flags = 0;
> - ctrl_ctx->drop_flags = 0;
> -
> - xhci_dbg(xhci, "Device address = %d\n", udev->devnum);
> - /* XXX Meh, not sure if anyone else but choose_address uses this. */
> - set_bit(udev->devnum, udev->bus->devmap.devicemap);
> -
> - return 0;
> -}
> -
> -/* Once a hub descriptor is fetched for a device, we need to update the xHC's
> - * internal data structures for the device.
> - */
> -int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
> - struct usb_tt *tt, gfp_t mem_flags)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - struct xhci_virt_device *vdev;
> - struct xhci_command *config_cmd;
> - struct xhci_input_control_ctx *ctrl_ctx;
> - struct xhci_slot_ctx *slot_ctx;
> - unsigned long flags;
> - unsigned think_time;
> - int ret;
> -
> - /* Ignore root hubs */
> - if (!hdev->parent)
> - return 0;
> -
> - vdev = xhci->devs[hdev->slot_id];
> - if (!vdev) {
> - xhci_warn(xhci, "Cannot update hub desc for unknown device.\n");
> - return -EINVAL;
> - }
> - config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
> - if (!config_cmd) {
> - xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
> - return -ENOMEM;
> - }
> -
> - spin_lock_irqsave(&xhci->lock, flags);
> - xhci_slot_copy(xhci, config_cmd->in_ctx, vdev->out_ctx);
> - ctrl_ctx = xhci_get_input_control_ctx(xhci, config_cmd->in_ctx);
> - ctrl_ctx->add_flags |= SLOT_FLAG;
> - slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
> - slot_ctx->dev_info |= DEV_HUB;
> - if (tt->multi)
> - slot_ctx->dev_info |= DEV_MTT;
> - if (xhci->hci_version > 0x95) {
> - xhci_dbg(xhci, "xHCI version %x needs hub "
> - "TT think time and number of ports\n",
> - (unsigned int) xhci->hci_version);
> - slot_ctx->dev_info2 |= XHCI_MAX_PORTS(hdev->maxchild);
> - /* Set TT think time - convert from ns to FS bit times.
> - * 0 = 8 FS bit times, 1 = 16 FS bit times,
> - * 2 = 24 FS bit times, 3 = 32 FS bit times.
> - */
> - think_time = tt->think_time;
> - if (think_time != 0)
> - think_time = (think_time / 666) - 1;
> - slot_ctx->tt_info |= TT_THINK_TIME(think_time);
> - } else {
> - xhci_dbg(xhci, "xHCI version %x doesn't need hub "
> - "TT think time or number of ports\n",
> - (unsigned int) xhci->hci_version);
> - }
> - slot_ctx->dev_state = 0;
> - spin_unlock_irqrestore(&xhci->lock, flags);
> -
> - xhci_dbg(xhci, "Set up %s for hub device.\n",
> - (xhci->hci_version > 0x95) ?
> - "configure endpoint" : "evaluate context");
> - xhci_dbg(xhci, "Slot %u Input Context:\n", hdev->slot_id);
> - xhci_dbg_ctx(xhci, config_cmd->in_ctx, 0);
> -
> - /* Issue and wait for the configure endpoint or
> - * evaluate context command.
> - */
> - if (xhci->hci_version > 0x95)
> - ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
> - false, false);
> - else
> - ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
> - true, false);
> -
> - xhci_dbg(xhci, "Slot %u Output Context:\n", hdev->slot_id);
> - xhci_dbg_ctx(xhci, vdev->out_ctx, 0);
> -
> - xhci_free_command(xhci, config_cmd);
> - return ret;
> -}
> -
> -int xhci_get_frame(struct usb_hcd *hcd)
> -{
> - struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> - /* EHCI mods by the periodic size. Why? */
> - return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3;
> -}
> -
> -MODULE_DESCRIPTION(DRIVER_DESC);
> -MODULE_AUTHOR(DRIVER_AUTHOR);
> -MODULE_LICENSE("GPL");
> -
> -static int __init xhci_hcd_init(void)
> -{
> -#ifdef CONFIG_PCI
> - int retval = 0;
> -
> - retval = xhci_register_pci();
> -
> - if (retval < 0) {
> - printk(KERN_DEBUG "Problem registering PCI driver.");
> - return retval;
> - }
> -#endif
> - /*
> - * Check the compiler generated sizes of structures that must be laid
> - * out in specific ways for hardware access.
> - */
> - BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
> - BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
> - BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
> - /* xhci_device_control has eight fields, and also
> - * embeds one xhci_slot_ctx and 31 xhci_ep_ctx
> - */
> - BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
> - BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
> - BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
> - BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
> - BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
> - /* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
> - BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
> - BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
> - return 0;
> -}
> -module_init(xhci_hcd_init);
> -
> -static void __exit xhci_hcd_cleanup(void)
> -{
> -#ifdef CONFIG_PCI
> - xhci_unregister_pci();
> -#endif
> -}
> -module_exit(xhci_hcd_cleanup);
> diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
> new file mode 100644
> index 0000000..4cb69e0
> --- /dev/null
> +++ b/drivers/usb/host/xhci.c
> @@ -0,0 +1,1916 @@
> +/*
> + * xHCI host controller driver
> + *
> + * Copyright (C) 2008 Intel Corp.
> + *
> + * Author: Sarah Sharp
> + * Some code borrowed from the Linux EHCI driver.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful, but
> + * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
> + * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
> + * for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software Foundation,
> + * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> + */
> +
> +#include <linux/irq.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +
> +#include "xhci.h"
> +
> +#define DRIVER_AUTHOR "Sarah Sharp"
> +#define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
> +
> +/* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */
> +static int link_quirk;
> +module_param(link_quirk, int, S_IRUGO | S_IWUSR);
> +MODULE_PARM_DESC(link_quirk, "Don't clear the chain bit on a link TRB");
> +
> +/* TODO: copied from ehci-hcd.c - can this be refactored? */
> +/*
> + * handshake - spin reading hc until handshake completes or fails
> + * @ptr: address of hc register to be read
> + * @mask: bits to look at in result of read
> + * @done: value of those bits when handshake succeeds
> + * @usec: timeout in microseconds
> + *
> + * Returns negative errno, or zero on success
> + *
> + * Success happens when the "mask" bits have the specified value (hardware
> + * handshake done). There are two failure modes: "usec" have passed (major
> + * hardware flakeout), or the register reads as all-ones (hardware removed).
> + */
> +static int handshake(struct xhci_hcd *xhci, void __iomem *ptr,
> + u32 mask, u32 done, int usec)
> +{
> + u32 result;
> +
> + do {
> + result = xhci_readl(xhci, ptr);
> + if (result == ~(u32)0) /* card removed */
> + return -ENODEV;
> + result &= mask;
> + if (result == done)
> + return 0;
> + udelay(1);
> + usec--;
> + } while (usec > 0);
> + return -ETIMEDOUT;
> +}
> +
> +/*
> + * Disable interrupts and begin the xHCI halting process.
> + */
> +void xhci_quiesce(struct xhci_hcd *xhci)
> +{
> + u32 halted;
> + u32 cmd;
> + u32 mask;
> +
> + mask = ~(XHCI_IRQS);
> + halted = xhci_readl(xhci, &xhci->op_regs->status) & STS_HALT;
> + if (!halted)
> + mask &= ~CMD_RUN;
> +
> + cmd = xhci_readl(xhci, &xhci->op_regs->command);
> + cmd &= mask;
> + xhci_writel(xhci, cmd, &xhci->op_regs->command);
> +}
> +
> +/*
> + * Force HC into halt state.
> + *
> + * Disable any IRQs and clear the run/stop bit.
> + * HC will complete any current and actively pipelined transactions, and
> + * should halt within 16 microframes of the run/stop bit being cleared.
> + * Read HC Halted bit in the status register to see when the HC is finished.
> + * XXX: shouldn't we set HC_STATE_HALT here somewhere?
> + */
> +int xhci_halt(struct xhci_hcd *xhci)
> +{
> + xhci_dbg(xhci, "// Halt the HC\n");
> + xhci_quiesce(xhci);
> +
> + return handshake(xhci, &xhci->op_regs->status,
> + STS_HALT, STS_HALT, XHCI_MAX_HALT_USEC);
> +}
> +
> +/*
> + * Reset a halted HC, and set the internal HC state to HC_STATE_HALT.
> + *
> + * This resets pipelines, timers, counters, state machines, etc.
> + * Transactions will be terminated immediately, and operational registers
> + * will be set to their defaults.
> + */
> +int xhci_reset(struct xhci_hcd *xhci)
> +{
> + u32 command;
> + u32 state;
> +
> + state = xhci_readl(xhci, &xhci->op_regs->status);
> + if ((state & STS_HALT) == 0) {
> + xhci_warn(xhci, "Host controller not halted, aborting reset.\n");
> + return 0;
> + }
> +
> + xhci_dbg(xhci, "// Reset the HC\n");
> + command = xhci_readl(xhci, &xhci->op_regs->command);
> + command |= CMD_RESET;
> + xhci_writel(xhci, command, &xhci->op_regs->command);
> + /* XXX: Why does EHCI set this here? Shouldn't other code do this? */
> + xhci_to_hcd(xhci)->state = HC_STATE_HALT;
> +
> + return handshake(xhci, &xhci->op_regs->command, CMD_RESET, 0, 250 * 1000);
> +}
> +
> +
> +#if 0
> +/* Set up MSI-X table for entry 0 (may claim other entries later) */
> +static int xhci_setup_msix(struct xhci_hcd *xhci)
> +{
> + int ret;
> + struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> +
> + xhci->msix_count = 0;
> + /* XXX: did I do this right? ixgbe does kcalloc for more than one */
> + xhci->msix_entries = kmalloc(sizeof(struct msix_entry), GFP_KERNEL);
> + if (!xhci->msix_entries) {
> + xhci_err(xhci, "Failed to allocate MSI-X entries\n");
> + return -ENOMEM;
> + }
> + xhci->msix_entries[0].entry = 0;
> +
> + ret = pci_enable_msix(pdev, xhci->msix_entries, xhci->msix_count);
> + if (ret) {
> + xhci_err(xhci, "Failed to enable MSI-X\n");
> + goto free_entries;
> + }
> +
> + /*
> + * Pass the xhci pointer value as the request_irq "cookie".
> + * If more irqs are added, this will need to be unique for each one.
> + */
> + ret = request_irq(xhci->msix_entries[0].vector, &xhci_irq, 0,
> + "xHCI", xhci_to_hcd(xhci));
> + if (ret) {
> + xhci_err(xhci, "Failed to allocate MSI-X interrupt\n");
> + goto disable_msix;
> + }
> + xhci_dbg(xhci, "Finished setting up MSI-X\n");
> + return 0;
> +
> +disable_msix:
> + pci_disable_msix(pdev);
> +free_entries:
> + kfree(xhci->msix_entries);
> + xhci->msix_entries = NULL;
> + return ret;
> +}
> +
> +/* XXX: code duplication; can xhci_setup_msix call this? */
> +/* Free any IRQs and disable MSI-X */
> +static void xhci_cleanup_msix(struct xhci_hcd *xhci)
> +{
> + struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller);
> + if (!xhci->msix_entries)
> + return;
> +
> + free_irq(xhci->msix_entries[0].vector, xhci);
> + pci_disable_msix(pdev);
> + kfree(xhci->msix_entries);
> + xhci->msix_entries = NULL;
> + xhci_dbg(xhci, "Finished cleaning up MSI-X\n");
> +}
> +#endif
> +
> +/*
> + * Initialize memory for HCD and xHC (one-time init).
> + *
> + * Program the PAGESIZE register, initialize the device context array, create
> + * device contexts (?), set up a command ring segment (or two?), create event
> + * ring (one for now).
> + */
> +int xhci_init(struct usb_hcd *hcd)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + int retval = 0;
> +
> + xhci_dbg(xhci, "xhci_init\n");
> + spin_lock_init(&xhci->lock);
> + if (link_quirk) {
> + xhci_dbg(xhci, "QUIRK: Not clearing Link TRB chain bits.\n");
> + xhci->quirks |= XHCI_LINK_TRB_QUIRK;
> + } else {
> + xhci_dbg(xhci, "xHCI doesn't need link TRB QUIRK\n");
> + }
> + retval = xhci_mem_init(xhci, GFP_KERNEL);
> + xhci_dbg(xhci, "Finished xhci_init\n");
> +
> + return retval;
> +}
> +
> +/*
> + * Called in interrupt context when there might be work
> + * queued on the event ring
> + *
> + * xhci->lock must be held by caller.
> + */
> +static void xhci_work(struct xhci_hcd *xhci)
> +{
> + u32 temp;
> + u64 temp_64;
> +
> + /*
> + * Clear the op reg interrupt status first,
> + * so we can receive interrupts from other MSI-X interrupters.
> + * Write 1 to clear the interrupt status.
> + */
> + temp = xhci_readl(xhci, &xhci->op_regs->status);
> + temp |= STS_EINT;
> + xhci_writel(xhci, temp, &xhci->op_regs->status);
> + /* FIXME when MSI-X is supported and there are multiple vectors */
> + /* Clear the MSI-X event interrupt status */
> +
> + /* Acknowledge the interrupt */
> + temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> + temp |= 0x3;
> + xhci_writel(xhci, temp, &xhci->ir_set->irq_pending);
> + /* Flush posted writes */
> + xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +
> + if (xhci->xhc_state & XHCI_STATE_DYING)
> + xhci_dbg(xhci, "xHCI dying, ignoring interrupt. "
> + "Shouldn't IRQs be disabled?\n");
> + else
> + /* FIXME this should be a delayed service routine
> + * that clears the EHB.
> + */
> + xhci_handle_event(xhci);
> +
> + /* Clear the event handler busy flag (RW1C); the event ring should be empty. */
> + temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> + xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue);
> + /* Flush posted writes -- FIXME is this necessary? */
> + xhci_readl(xhci, &xhci->ir_set->irq_pending);
> +}
> +
> +/*-------------------------------------------------------------------------*/
> +
> +/*
> + * xHCI spec says we can get an interrupt, and if the HC has an error condition,
> + * we might get bad data out of the event ring. Section 4.10.2.7 has a list of
> + * indicators of an event TRB error, but we check the status *first* to be safe.
> + */
> +irqreturn_t xhci_irq(struct usb_hcd *hcd)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + u32 temp, temp2;
> + union xhci_trb *trb;
> +
> + spin_lock(&xhci->lock);
> + trb = xhci->event_ring->dequeue;
> + /* Check if the xHC generated the interrupt, or the irq is shared */
> + temp = xhci_readl(xhci, &xhci->op_regs->status);
> + temp2 = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> + if (temp == 0xffffffff && temp2 == 0xffffffff)
> + goto hw_died;
> +
> + if (!(temp & STS_EINT) && !ER_IRQ_PENDING(temp2)) {
> + spin_unlock(&xhci->lock);
> + return IRQ_NONE;
> + }
> + xhci_dbg(xhci, "op reg status = %08x\n", temp);
> + xhci_dbg(xhci, "ir set irq_pending = %08x\n", temp2);
> + xhci_dbg(xhci, "Event ring dequeue ptr:\n");
> + xhci_dbg(xhci, "@%llx %08x %08x %08x %08x\n",
> + (unsigned long long)xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, trb),
> + lower_32_bits(trb->link.segment_ptr),
> + upper_32_bits(trb->link.segment_ptr),
> + (unsigned int) trb->link.intr_target,
> + (unsigned int) trb->link.control);
> +
> + if (temp & STS_FATAL) {
> + xhci_warn(xhci, "WARNING: Host System Error\n");
> + xhci_halt(xhci);
> +hw_died:
> + xhci_to_hcd(xhci)->state = HC_STATE_HALT;
> + spin_unlock(&xhci->lock);
> + return -ESHUTDOWN;
> + }
> +
> + xhci_work(xhci);
> + spin_unlock(&xhci->lock);
> +
> + return IRQ_HANDLED;
> +}
> +
> +#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> +void xhci_event_ring_work(unsigned long arg)
> +{
> + unsigned long flags;
> + int temp;
> + u64 temp_64;
> + struct xhci_hcd *xhci = (struct xhci_hcd *) arg;
> + int i, j;
> +
> + xhci_dbg(xhci, "Poll event ring: %lu\n", jiffies);
> +
> + spin_lock_irqsave(&xhci->lock, flags);
> + temp = xhci_readl(xhci, &xhci->op_regs->status);
> + xhci_dbg(xhci, "op reg status = 0x%x\n", temp);
> + if (temp == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING)) {
> + xhci_dbg(xhci, "HW died, polling stopped.\n");
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + return;
> + }
> +
> + temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> + xhci_dbg(xhci, "ir_set 0 pending = 0x%x\n", temp);
> + xhci_dbg(xhci, "No-op commands handled = %d\n", xhci->noops_handled);
> + xhci_dbg(xhci, "HC error bitmask = 0x%x\n", xhci->error_bitmask);
> + xhci->error_bitmask = 0;
> + xhci_dbg(xhci, "Event ring:\n");
> + xhci_debug_segment(xhci, xhci->event_ring->deq_seg);
> + xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
> + temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> + temp_64 &= ~ERST_PTR_MASK;
> + xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
> + xhci_dbg(xhci, "Command ring:\n");
> + xhci_debug_segment(xhci, xhci->cmd_ring->deq_seg);
> + xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
> + xhci_dbg_cmd_ptrs(xhci);
> + for (i = 0; i < MAX_HC_SLOTS; ++i) {
> + if (!xhci->devs[i])
> + continue;
> + for (j = 0; j < 31; ++j) {
> + struct xhci_ring *ring = xhci->devs[i]->eps[j].ring;
> + if (!ring)
> + continue;
> + xhci_dbg(xhci, "Dev %d endpoint ring %d:\n", i, j);
> + xhci_debug_segment(xhci, ring->deq_seg);
> + }
> + }
> +
> + if (xhci->noops_submitted != NUM_TEST_NOOPS)
> + if (xhci_setup_one_noop(xhci))
> + xhci_ring_cmd_db(xhci);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> +
> + if (!xhci->zombie)
> + mod_timer(&xhci->event_ring_timer, jiffies + POLL_TIMEOUT * HZ);
> + else
> + xhci_dbg(xhci, "Quit polling the event ring.\n");
> +}
> +#endif
> +
> +/*
> + * Start the HC after it was halted.
> + *
> + * This function is called by the USB core when the HC driver is added.
> + * Its opposite is xhci_stop().
> + *
> + * xhci_init() must be called once before this function can be called.
> + * Reset the HC, enable device slot contexts, program DCBAAP, and
> + * set command ring pointer and event ring pointer.
> + *
> + * Setup MSI-X vectors and enable interrupts.
> + */
> +int xhci_run(struct usb_hcd *hcd)
> +{
> + u32 temp;
> + u64 temp_64;
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + void (*doorbell)(struct xhci_hcd *) = NULL;
> +
> + hcd->uses_new_polling = 1;
> + hcd->poll_rh = 0;
> +
> + xhci_dbg(xhci, "xhci_run\n");
> +#if 0 /* FIXME: MSI not setup yet */
> + /* Do this at the very last minute */
> + ret = xhci_setup_msix(xhci);
> + if (!ret)
> + return ret;
> +
> + return -ENOSYS;
> +#endif
> +#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> + init_timer(&xhci->event_ring_timer);
> + xhci->event_ring_timer.data = (unsigned long) xhci;
> + xhci->event_ring_timer.function = xhci_event_ring_work;
> + /* Poll the event ring */
> + xhci->event_ring_timer.expires = jiffies + POLL_TIMEOUT * HZ;
> + xhci->zombie = 0;
> + xhci_dbg(xhci, "Setting event ring polling timer\n");
> + add_timer(&xhci->event_ring_timer);
> +#endif
> +
> + xhci_dbg(xhci, "Command ring memory map follows:\n");
> + xhci_debug_ring(xhci, xhci->cmd_ring);
> + xhci_dbg_ring_ptrs(xhci, xhci->cmd_ring);
> + xhci_dbg_cmd_ptrs(xhci);
> +
> + xhci_dbg(xhci, "ERST memory map follows:\n");
> + xhci_dbg_erst(xhci, &xhci->erst);
> + xhci_dbg(xhci, "Event ring:\n");
> + xhci_debug_ring(xhci, xhci->event_ring);
> + xhci_dbg_ring_ptrs(xhci, xhci->event_ring);
> + temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue);
> + temp_64 &= ~ERST_PTR_MASK;
> + xhci_dbg(xhci, "ERST deq = 64'h%0lx\n", (long unsigned int) temp_64);
> +
> + xhci_dbg(xhci, "// Set the interrupt modulation register\n");
> + temp = xhci_readl(xhci, &xhci->ir_set->irq_control);
> + temp &= ~ER_IRQ_INTERVAL_MASK;
> + temp |= (u32) 160;
> + xhci_writel(xhci, temp, &xhci->ir_set->irq_control);
> +
> + /* Set the HCD state before we enable the irqs */
> + hcd->state = HC_STATE_RUNNING;
> + temp = xhci_readl(xhci, &xhci->op_regs->command);
> + temp |= (CMD_EIE);
> + xhci_dbg(xhci, "// Enable interrupts, cmd = 0x%x.\n",
> + temp);
> + xhci_writel(xhci, temp, &xhci->op_regs->command);
> +
> + temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> + xhci_dbg(xhci, "// Enabling event ring interrupter %p by writing 0x%x to irq_pending\n",
> + xhci->ir_set, (unsigned int) ER_IRQ_ENABLE(temp));
> + xhci_writel(xhci, ER_IRQ_ENABLE(temp),
> + &xhci->ir_set->irq_pending);
> + xhci_print_ir_set(xhci, xhci->ir_set, 0);
> +
> + if (NUM_TEST_NOOPS > 0)
> + doorbell = xhci_setup_one_noop(xhci);
> +
> + temp = xhci_readl(xhci, &xhci->op_regs->command);
> + temp |= (CMD_RUN);
> + xhci_dbg(xhci, "// Turn on HC, cmd = 0x%x.\n",
> + temp);
> + xhci_writel(xhci, temp, &xhci->op_regs->command);
> + /* Flush PCI posted writes */
> + temp = xhci_readl(xhci, &xhci->op_regs->command);
> + xhci_dbg(xhci, "// @%p = 0x%x\n", &xhci->op_regs->command, temp);
> + if (doorbell)
> + (*doorbell)(xhci);
> +
> + xhci_dbg(xhci, "Finished xhci_run\n");
> + return 0;
> +}
> +
> +/*
> + * Stop xHCI driver.
> + *
> + * This function is called by the USB core when the HC driver is removed.
> + * Its opposite is xhci_run().
> + *
> + * Disable device contexts, disable IRQs, and quiesce the HC.
> + * Reset the HC, finish any completed transactions, and cleanup memory.
> + */
> +void xhci_stop(struct usb_hcd *hcd)
> +{
> + u32 temp;
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +
> + spin_lock_irq(&xhci->lock);
> + xhci_halt(xhci);
> + xhci_reset(xhci);
> + spin_unlock_irq(&xhci->lock);
> +
> +#if 0 /* No MSI yet */
> + xhci_cleanup_msix(xhci);
> +#endif
> +#ifdef CONFIG_USB_XHCI_HCD_DEBUGGING
> + /* Tell the event ring poll function not to reschedule */
> + xhci->zombie = 1;
> + del_timer_sync(&xhci->event_ring_timer);
> +#endif
> +
> + xhci_dbg(xhci, "// Disabling event ring interrupts\n");
> + temp = xhci_readl(xhci, &xhci->op_regs->status);
> + xhci_writel(xhci, temp & ~STS_EINT, &xhci->op_regs->status);
> + temp = xhci_readl(xhci, &xhci->ir_set->irq_pending);
> + xhci_writel(xhci, ER_IRQ_DISABLE(temp),
> + &xhci->ir_set->irq_pending);
> + xhci_print_ir_set(xhci, xhci->ir_set, 0);
> +
> + xhci_dbg(xhci, "cleaning up memory\n");
> + xhci_mem_cleanup(xhci);
> + xhci_dbg(xhci, "xhci_stop completed - status = %x\n",
> + xhci_readl(xhci, &xhci->op_regs->status));
> +}
> +
> +/*
> + * Shutdown HC (not bus-specific)
> + *
> + * This is called when the machine is rebooting or halting. We assume that the
> + * machine will be powered off, and the HC's internal state will be reset.
> + * Don't bother to free memory.
> + */
> +void xhci_shutdown(struct usb_hcd *hcd)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> +
> + spin_lock_irq(&xhci->lock);
> + xhci_halt(xhci);
> + spin_unlock_irq(&xhci->lock);
> +
> +#if 0
> + xhci_cleanup_msix(xhci);
> +#endif
> +
> + xhci_dbg(xhci, "xhci_shutdown completed - status = %x\n",
> + xhci_readl(xhci, &xhci->op_regs->status));
> +}
> +
> +/*-------------------------------------------------------------------------*/
> +
> +/**
> + * xhci_get_endpoint_index - Used for passing endpoint bitmasks between the core and
> + * HCDs. Find the index for an endpoint given its descriptor. Use the return
> + * value to right shift 1 for the bitmask.
> + *
> + * Index = (epnum * 2) + direction - 1,
> + * where direction = 0 for OUT, 1 for IN.
> + * For control endpoints, the IN index is used (OUT index is unused), so
> + * index = (epnum * 2) + direction - 1 = (epnum * 2) + 1 - 1 = (epnum * 2)
> + */
> +unsigned int xhci_get_endpoint_index(struct usb_endpoint_descriptor *desc)
> +{
> + unsigned int index;
> + if (usb_endpoint_xfer_control(desc))
> + index = (unsigned int) (usb_endpoint_num(desc)*2);
> + else
> + index = (unsigned int) (usb_endpoint_num(desc)*2) +
> + (usb_endpoint_dir_in(desc) ? 1 : 0) - 1;
> + return index;
> +}
> +
> +/* Find the flag for this endpoint (for use in the control context). Use the
> + * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
> + * bit 1, etc.
> + */
> +unsigned int xhci_get_endpoint_flag(struct usb_endpoint_descriptor *desc)
> +{
> + return 1 << (xhci_get_endpoint_index(desc) + 1);
> +}
> +
> +/* Find the flag for this endpoint (for use in the control context). Use the
> + * endpoint index to create a bitmask. The slot context is bit 0, endpoint 0 is
> + * bit 1, etc.
> + */
> +unsigned int xhci_get_endpoint_flag_from_index(unsigned int ep_index)
> +{
> + return 1 << (ep_index + 1);
> +}
> +
> +/* Compute the last valid endpoint context index. Basically, this is the
> + * endpoint index plus one. For slot contexts with more than valid endpoint,
> + * we find the most significant bit set in the added contexts flags.
> + * e.g. ep 1 IN (with epnum 0x81) => added_ctxs = 0b1000
> + * fls(0b1000) = 4, but the endpoint context index is 3, so subtract one.
> + */
> +unsigned int xhci_last_valid_endpoint(u32 added_ctxs)
> +{
> + return fls(added_ctxs) - 1;
> +}
> +
> +/* Returns 1 if the arguments are OK;
> + * returns 0 this is a root hub; returns -EINVAL for NULL pointers.
> + */
> +int xhci_check_args(struct usb_hcd *hcd, struct usb_device *udev,
> + struct usb_host_endpoint *ep, int check_ep, const char *func) {
> + if (!hcd || (check_ep && !ep) || !udev) {
> + printk(KERN_DEBUG "xHCI %s called with invalid args\n",
> + func);
> + return -EINVAL;
> + }
> + if (!udev->parent) {
> + printk(KERN_DEBUG "xHCI %s called for root hub\n",
> + func);
> + return 0;
> + }
> + if (!udev->slot_id) {
> + printk(KERN_DEBUG "xHCI %s called with unaddressed device\n",
> + func);
> + return -EINVAL;
> + }
> + return 1;
> +}
> +
> +static int xhci_configure_endpoint(struct xhci_hcd *xhci,
> + struct usb_device *udev, struct xhci_command *command,
> + bool ctx_change, bool must_succeed);
> +
> +/*
> + * Full speed devices may have a max packet size greater than 8 bytes, but the
> + * USB core doesn't know that until it reads the first 8 bytes of the
> + * descriptor. If the usb_device's max packet size changes after that point,
> + * we need to issue an evaluate context command and wait on it.
> + */
> +static int xhci_check_maxpacket(struct xhci_hcd *xhci, unsigned int slot_id,
> + unsigned int ep_index, struct urb *urb)
> +{
> + struct xhci_container_ctx *in_ctx;
> + struct xhci_container_ctx *out_ctx;
> + struct xhci_input_control_ctx *ctrl_ctx;
> + struct xhci_ep_ctx *ep_ctx;
> + int max_packet_size;
> + int hw_max_packet_size;
> + int ret = 0;
> +
> + out_ctx = xhci->devs[slot_id]->out_ctx;
> + ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> + hw_max_packet_size = MAX_PACKET_DECODED(ep_ctx->ep_info2);
> + max_packet_size = urb->dev->ep0.desc.wMaxPacketSize;
> + if (hw_max_packet_size != max_packet_size) {
> + xhci_dbg(xhci, "Max Packet Size for ep 0 changed.\n");
> + xhci_dbg(xhci, "Max packet size in usb_device = %d\n",
> + max_packet_size);
> + xhci_dbg(xhci, "Max packet size in xHCI HW = %d\n",
> + hw_max_packet_size);
> + xhci_dbg(xhci, "Issuing evaluate context command.\n");
> +
> + /* Set up the modified control endpoint 0 */
> + xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
> + xhci->devs[slot_id]->out_ctx, ep_index);
> + in_ctx = xhci->devs[slot_id]->in_ctx;
> + ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
> + ep_ctx->ep_info2 &= ~MAX_PACKET_MASK;
> + ep_ctx->ep_info2 |= MAX_PACKET(max_packet_size);
> +
> + /* Set up the input context flags for the command */
> + /* FIXME: This won't work if a non-default control endpoint
> + * changes max packet sizes.
> + */
> + ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> + ctrl_ctx->add_flags = EP0_FLAG;
> + ctrl_ctx->drop_flags = 0;
> +
> + xhci_dbg(xhci, "Slot %d input context\n", slot_id);
> + xhci_dbg_ctx(xhci, in_ctx, ep_index);
> + xhci_dbg(xhci, "Slot %d output context\n", slot_id);
> + xhci_dbg_ctx(xhci, out_ctx, ep_index);
> +
> + ret = xhci_configure_endpoint(xhci, urb->dev, NULL,
> + true, false);
> +
> + /* Clean up the input context for later use by bandwidth
> + * functions.
> + */
> + ctrl_ctx->add_flags = SLOT_FLAG;
> + }
> + return ret;
> +}
> +
> +/*
> + * non-error returns are a promise to giveback() the urb later
> + * we drop ownership so next owner (or urb unlink) can get it
> + */
> +int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + unsigned long flags;
> + int ret = 0;
> + unsigned int slot_id, ep_index;
> +
> +
> + if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, __func__) <= 0)
> + return -EINVAL;
> +
> + slot_id = urb->dev->slot_id;
> + ep_index = xhci_get_endpoint_index(&urb->ep->desc);
> +
> + if (!xhci->devs || !xhci->devs[slot_id]) {
> + if (!in_interrupt())
> + dev_warn(&urb->dev->dev, "WARN: urb submitted for dev with no Slot ID\n");
> + ret = -EINVAL;
> + goto exit;
> + }
> + if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
> + if (!in_interrupt())
> + xhci_dbg(xhci, "urb submitted during PCI suspend\n");
> + ret = -ESHUTDOWN;
> + goto exit;
> + }
> + if (usb_endpoint_xfer_control(&urb->ep->desc)) {
> + /* Check to see if the max packet size for the default control
> + * endpoint changed during FS device enumeration
> + */
> + if (urb->dev->speed == USB_SPEED_FULL) {
> + ret = xhci_check_maxpacket(xhci, slot_id,
> + ep_index, urb);
> + if (ret < 0)
> + return ret;
> + }
> +
> + /* We have a spinlock and interrupts disabled, so we must pass
> + * atomic context to this function, which may allocate memory.
> + */
> + spin_lock_irqsave(&xhci->lock, flags);
> + if (xhci->xhc_state & XHCI_STATE_DYING)
> + goto dying;
> + ret = xhci_queue_ctrl_tx(xhci, GFP_ATOMIC, urb,
> + slot_id, ep_index);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + } else if (usb_endpoint_xfer_bulk(&urb->ep->desc)) {
> + spin_lock_irqsave(&xhci->lock, flags);
> + if (xhci->xhc_state & XHCI_STATE_DYING)
> + goto dying;
> + ret = xhci_queue_bulk_tx(xhci, GFP_ATOMIC, urb,
> + slot_id, ep_index);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + } else if (usb_endpoint_xfer_int(&urb->ep->desc)) {
> + spin_lock_irqsave(&xhci->lock, flags);
> + if (xhci->xhc_state & XHCI_STATE_DYING)
> + goto dying;
> + ret = xhci_queue_intr_tx(xhci, GFP_ATOMIC, urb,
> + slot_id, ep_index);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + } else {
> + ret = -EINVAL;
> + }
> +exit:
> + return ret;
> +dying:
> + xhci_dbg(xhci, "Ep 0x%x: URB %p submitted for "
> + "non-responsive xHCI host.\n",
> + urb->ep->desc.bEndpointAddress, urb);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + return -ESHUTDOWN;
> +}
> +
> +/*
> + * Remove the URB's TD from the endpoint ring. This may cause the HC to stop
> + * USB transfers, potentially stopping in the middle of a TRB buffer. The HC
> + * should pick up where it left off in the TD, unless a Set Transfer Ring
> + * Dequeue Pointer is issued.
> + *
> + * The TRBs that make up the buffers for the canceled URB will be "removed" from
> + * the ring. Since the ring is a contiguous structure, they can't be physically
> + * removed. Instead, there are two options:
> + *
> + * 1) If the HC is in the middle of processing the URB to be canceled, we
> + * simply move the ring's dequeue pointer past those TRBs using the Set
> + * Transfer Ring Dequeue Pointer command. This will be the common case,
> + * when drivers timeout on the last submitted URB and attempt to cancel.
> + *
> + * 2) If the HC is in the middle of a different TD, we turn the TRBs into a
> + * series of 1-TRB transfer no-op TDs. (No-ops shouldn't be chained.) The
> + * HC will need to invalidate the any TRBs it has cached after the stop
> + * endpoint command, as noted in the xHCI 0.95 errata.
> + *
> + * 3) The TD may have completed by the time the Stop Endpoint Command
> + * completes, so software needs to handle that case too.
> + *
> + * This function should protect against the TD enqueueing code ringing the
> + * doorbell while this code is waiting for a Stop Endpoint command to complete.
> + * It also needs to account for multiple cancellations on happening at the same
> + * time for the same endpoint.
> + *
> + * Note that this function can be called in any context, or so says
> + * usb_hcd_unlink_urb()
> + */
> +int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
> +{
> + unsigned long flags;
> + int ret;
> + u32 temp;
> + struct xhci_hcd *xhci;
> + struct xhci_td *td;
> + unsigned int ep_index;
> + struct xhci_ring *ep_ring;
> + struct xhci_virt_ep *ep;
> +
> + xhci = hcd_to_xhci(hcd);
> + spin_lock_irqsave(&xhci->lock, flags);
> + /* Make sure the URB hasn't completed or been unlinked already */
> + ret = usb_hcd_check_unlink_urb(hcd, urb, status);
> + if (ret || !urb->hcpriv)
> + goto done;
> + temp = xhci_readl(xhci, &xhci->op_regs->status);
> + if (temp == 0xffffffff) {
> + xhci_dbg(xhci, "HW died, freeing TD.\n");
> + td = (struct xhci_td *) urb->hcpriv;
> +
> + usb_hcd_unlink_urb_from_ep(hcd, urb);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + usb_hcd_giveback_urb(xhci_to_hcd(xhci), urb, -ESHUTDOWN);
> + kfree(td);
> + return ret;
> + }
> + if (xhci->xhc_state & XHCI_STATE_DYING) {
> + xhci_dbg(xhci, "Ep 0x%x: URB %p to be canceled on "
> + "non-responsive xHCI host.\n",
> + urb->ep->desc.bEndpointAddress, urb);
> + /* Let the stop endpoint command watchdog timer (which set this
> + * state) finish cleaning up the endpoint TD lists. We must
> + * have caught it in the middle of dropping a lock and giving
> + * back an URB.
> + */
> + goto done;
> + }
> +
> + xhci_dbg(xhci, "Cancel URB %p\n", urb);
> + xhci_dbg(xhci, "Event ring:\n");
> + xhci_debug_ring(xhci, xhci->event_ring);
> + ep_index = xhci_get_endpoint_index(&urb->ep->desc);
> + ep = &xhci->devs[urb->dev->slot_id]->eps[ep_index];
> + ep_ring = ep->ring;
> + xhci_dbg(xhci, "Endpoint ring:\n");
> + xhci_debug_ring(xhci, ep_ring);
> + td = (struct xhci_td *) urb->hcpriv;
> +
> + list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list);
> + /* Queue a stop endpoint command, but only if this is
> + * the first cancellation to be handled.
> + */
> + if (!(ep->ep_state & EP_HALT_PENDING)) {
> + ep->ep_state |= EP_HALT_PENDING;
> + ep->stop_cmds_pending++;
> + ep->stop_cmd_timer.expires = jiffies +
> + XHCI_STOP_EP_CMD_TIMEOUT * HZ;
> + add_timer(&ep->stop_cmd_timer);
> + xhci_queue_stop_endpoint(xhci, urb->dev->slot_id, ep_index);
> + xhci_ring_cmd_db(xhci);
> + }
> +done:
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + return ret;
> +}
> +
> +/* Drop an endpoint from a new bandwidth configuration for this device.
> + * Only one call to this function is allowed per endpoint before
> + * check_bandwidth() or reset_bandwidth() must be called.
> + * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
> + * add the endpoint to the schedule with possibly new parameters denoted by a
> + * different endpoint descriptor in usb_host_endpoint.
> + * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
> + * not allowed.
> + *
> + * The USB core will not allow URBs to be queued to an endpoint that is being
> + * disabled, so there's no need for mutual exclusion to protect
> + * the xhci->devs[slot_id] structure.
> + */
> +int xhci_drop_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> + struct usb_host_endpoint *ep)
> +{
> + struct xhci_hcd *xhci;
> + struct xhci_container_ctx *in_ctx, *out_ctx;
> + struct xhci_input_control_ctx *ctrl_ctx;
> + struct xhci_slot_ctx *slot_ctx;
> + unsigned int last_ctx;
> + unsigned int ep_index;
> + struct xhci_ep_ctx *ep_ctx;
> + u32 drop_flag;
> + u32 new_add_flags, new_drop_flags, new_slot_info;
> + int ret;
> +
> + ret = xhci_check_args(hcd, udev, ep, 1, __func__);
> + if (ret <= 0)
> + return ret;
> + xhci = hcd_to_xhci(hcd);
> + xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> +
> + drop_flag = xhci_get_endpoint_flag(&ep->desc);
> + if (drop_flag == SLOT_FLAG || drop_flag == EP0_FLAG) {
> + xhci_dbg(xhci, "xHCI %s - can't drop slot or ep 0 %#x\n",
> + __func__, drop_flag);
> + return 0;
> + }
> +
> + if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> + xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> + __func__);
> + return -EINVAL;
> + }
> +
> + in_ctx = xhci->devs[udev->slot_id]->in_ctx;
> + out_ctx = xhci->devs[udev->slot_id]->out_ctx;
> + ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> + ep_index = xhci_get_endpoint_index(&ep->desc);
> + ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> + /* If the HC already knows the endpoint is disabled,
> + * or the HCD has noted it is disabled, ignore this request
> + */
> + if ((ep_ctx->ep_info & EP_STATE_MASK) == EP_STATE_DISABLED ||
> + ctrl_ctx->drop_flags & xhci_get_endpoint_flag(&ep->desc)) {
> + xhci_warn(xhci, "xHCI %s called with disabled ep %p\n",
> + __func__, ep);
> + return 0;
> + }
> +
> + ctrl_ctx->drop_flags |= drop_flag;
> + new_drop_flags = ctrl_ctx->drop_flags;
> +
> + ctrl_ctx->add_flags &= ~drop_flag;
> + new_add_flags = ctrl_ctx->add_flags;
> +
> + last_ctx = xhci_last_valid_endpoint(ctrl_ctx->add_flags);
> + slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
> + /* Update the last valid endpoint context, if we deleted the last one */
> + if ((slot_ctx->dev_info & LAST_CTX_MASK) > LAST_CTX(last_ctx)) {
> + slot_ctx->dev_info &= ~LAST_CTX_MASK;
> + slot_ctx->dev_info |= LAST_CTX(last_ctx);
> + }
> + new_slot_info = slot_ctx->dev_info;
> +
> + xhci_endpoint_zero(xhci, xhci->devs[udev->slot_id], ep);
> +
> + xhci_dbg(xhci, "drop ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
> + (unsigned int) ep->desc.bEndpointAddress,
> + udev->slot_id,
> + (unsigned int) new_drop_flags,
> + (unsigned int) new_add_flags,
> + (unsigned int) new_slot_info);
> + return 0;
> +}
> +
> +/* Add an endpoint to a new possible bandwidth configuration for this device.
> + * Only one call to this function is allowed per endpoint before
> + * check_bandwidth() or reset_bandwidth() must be called.
> + * A call to xhci_drop_endpoint() followed by a call to xhci_add_endpoint() will
> + * add the endpoint to the schedule with possibly new parameters denoted by a
> + * different endpoint descriptor in usb_host_endpoint.
> + * A call to xhci_add_endpoint() followed by a call to xhci_drop_endpoint() is
> + * not allowed.
> + *
> + * The USB core will not allow URBs to be queued to an endpoint until the
> + * configuration or alt setting is installed in the device, so there's no need
> + * for mutual exclusion to protect the xhci->devs[slot_id] structure.
> + */
> +int xhci_add_endpoint(struct usb_hcd *hcd, struct usb_device *udev,
> + struct usb_host_endpoint *ep)
> +{
> + struct xhci_hcd *xhci;
> + struct xhci_container_ctx *in_ctx, *out_ctx;
> + unsigned int ep_index;
> + struct xhci_ep_ctx *ep_ctx;
> + struct xhci_slot_ctx *slot_ctx;
> + struct xhci_input_control_ctx *ctrl_ctx;
> + u32 added_ctxs;
> + unsigned int last_ctx;
> + u32 new_add_flags, new_drop_flags, new_slot_info;
> + int ret = 0;
> +
> + ret = xhci_check_args(hcd, udev, ep, 1, __func__);
> + if (ret <= 0) {
> + /* So we won't queue a reset ep command for a root hub */
> + ep->hcpriv = NULL;
> + return ret;
> + }
> + xhci = hcd_to_xhci(hcd);
> +
> + added_ctxs = xhci_get_endpoint_flag(&ep->desc);
> + last_ctx = xhci_last_valid_endpoint(added_ctxs);
> + if (added_ctxs == SLOT_FLAG || added_ctxs == EP0_FLAG) {
> + /* FIXME when we have to issue an evaluate endpoint command to
> + * deal with ep0 max packet size changing once we get the
> + * descriptors
> + */
> + xhci_dbg(xhci, "xHCI %s - can't add slot or ep 0 %#x\n",
> + __func__, added_ctxs);
> + return 0;
> + }
> +
> + if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> + xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> + __func__);
> + return -EINVAL;
> + }
> +
> + in_ctx = xhci->devs[udev->slot_id]->in_ctx;
> + out_ctx = xhci->devs[udev->slot_id]->out_ctx;
> + ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> + ep_index = xhci_get_endpoint_index(&ep->desc);
> + ep_ctx = xhci_get_ep_ctx(xhci, out_ctx, ep_index);
> + /* If the HCD has already noted the endpoint is enabled,
> + * ignore this request.
> + */
> + if (ctrl_ctx->add_flags & xhci_get_endpoint_flag(&ep->desc)) {
> + xhci_warn(xhci, "xHCI %s called with enabled ep %p\n",
> + __func__, ep);
> + return 0;
> + }
> +
> + /*
> + * Configuration and alternate setting changes must be done in
> + * process context, not interrupt context (or so documenation
> + * for usb_set_interface() and usb_set_configuration() claim).
> + */
> + if (xhci_endpoint_init(xhci, xhci->devs[udev->slot_id],
> + udev, ep, GFP_NOIO) < 0) {
> + dev_dbg(&udev->dev, "%s - could not initialize ep %#x\n",
> + __func__, ep->desc.bEndpointAddress);
> + return -ENOMEM;
> + }
> +
> + ctrl_ctx->add_flags |= added_ctxs;
> + new_add_flags = ctrl_ctx->add_flags;
> +
> + /* If xhci_endpoint_disable() was called for this endpoint, but the
> + * xHC hasn't been notified yet through the check_bandwidth() call,
> + * this re-adds a new state for the endpoint from the new endpoint
> + * descriptors. We must drop and re-add this endpoint, so we leave the
> + * drop flags alone.
> + */
> + new_drop_flags = ctrl_ctx->drop_flags;
> +
> + slot_ctx = xhci_get_slot_ctx(xhci, in_ctx);
> + /* Update the last valid endpoint context, if we just added one past */
> + if ((slot_ctx->dev_info & LAST_CTX_MASK) < LAST_CTX(last_ctx)) {
> + slot_ctx->dev_info &= ~LAST_CTX_MASK;
> + slot_ctx->dev_info |= LAST_CTX(last_ctx);
> + }
> + new_slot_info = slot_ctx->dev_info;
> +
> + /* Store the usb_device pointer for later use */
> + ep->hcpriv = udev;
> +
> + xhci_dbg(xhci, "add ep 0x%x, slot id %d, new drop flags = %#x, new add flags = %#x, new slot info = %#x\n",
> + (unsigned int) ep->desc.bEndpointAddress,
> + udev->slot_id,
> + (unsigned int) new_drop_flags,
> + (unsigned int) new_add_flags,
> + (unsigned int) new_slot_info);
> + return 0;
> +}
> +
> +static void xhci_zero_in_ctx(struct xhci_hcd *xhci, struct xhci_virt_device *virt_dev)
> +{
> + struct xhci_input_control_ctx *ctrl_ctx;
> + struct xhci_ep_ctx *ep_ctx;
> + struct xhci_slot_ctx *slot_ctx;
> + int i;
> +
> + /* When a device's add flag and drop flag are zero, any subsequent
> + * configure endpoint command will leave that endpoint's state
> + * untouched. Make sure we don't leave any old state in the input
> + * endpoint contexts.
> + */
> + ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> + ctrl_ctx->drop_flags = 0;
> + ctrl_ctx->add_flags = 0;
> + slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
> + slot_ctx->dev_info &= ~LAST_CTX_MASK;
> + /* Endpoint 0 is always valid */
> + slot_ctx->dev_info |= LAST_CTX(1);
> + for (i = 1; i < 31; ++i) {
> + ep_ctx = xhci_get_ep_ctx(xhci, virt_dev->in_ctx, i);
> + ep_ctx->ep_info = 0;
> + ep_ctx->ep_info2 = 0;
> + ep_ctx->deq = 0;
> + ep_ctx->tx_info = 0;
> + }
> +}
> +
> +static int xhci_configure_endpoint_result(struct xhci_hcd *xhci,
> + struct usb_device *udev, int *cmd_status)
> +{
> + int ret;
> +
> + switch (*cmd_status) {
> + case COMP_ENOMEM:
> + dev_warn(&udev->dev, "Not enough host controller resources "
> + "for new device state.\n");
> + ret = -ENOMEM;
> + /* FIXME: can we allocate more resources for the HC? */
> + break;
> + case COMP_BW_ERR:
> + dev_warn(&udev->dev, "Not enough bandwidth "
> + "for new device state.\n");
> + ret = -ENOSPC;
> + /* FIXME: can we go back to the old state? */
> + break;
> + case COMP_TRB_ERR:
> + /* the HCD set up something wrong */
> + dev_warn(&udev->dev, "ERROR: Endpoint drop flag = 0, "
> + "add flag = 1, "
> + "and endpoint is not disabled.\n");
> + ret = -EINVAL;
> + break;
> + case COMP_SUCCESS:
> + dev_dbg(&udev->dev, "Successful Endpoint Configure command\n");
> + ret = 0;
> + break;
> + default:
> + xhci_err(xhci, "ERROR: unexpected command completion "
> + "code 0x%x.\n", *cmd_status);
> + ret = -EINVAL;
> + break;
> + }
> + return ret;
> +}
> +
> +static int xhci_evaluate_context_result(struct xhci_hcd *xhci,
> + struct usb_device *udev, int *cmd_status)
> +{
> + int ret;
> + struct xhci_virt_device *virt_dev = xhci->devs[udev->slot_id];
> +
> + switch (*cmd_status) {
> + case COMP_EINVAL:
> + dev_warn(&udev->dev, "WARN: xHCI driver setup invalid evaluate "
> + "context command.\n");
> + ret = -EINVAL;
> + break;
> + case COMP_EBADSLT:
> + dev_warn(&udev->dev, "WARN: slot not enabled for"
> + "evaluate context command.\n");
> + case COMP_CTX_STATE:
> + dev_warn(&udev->dev, "WARN: invalid context state for "
> + "evaluate context command.\n");
> + xhci_dbg_ctx(xhci, virt_dev->out_ctx, 1);
> + ret = -EINVAL;
> + break;
> + case COMP_SUCCESS:
> + dev_dbg(&udev->dev, "Successful evaluate context command\n");
> + ret = 0;
> + break;
> + default:
> + xhci_err(xhci, "ERROR: unexpected command completion "
> + "code 0x%x.\n", *cmd_status);
> + ret = -EINVAL;
> + break;
> + }
> + return ret;
> +}
> +
> +/* Issue a configure endpoint command or evaluate context command
> + * and wait for it to finish.
> + */
> +static int xhci_configure_endpoint(struct xhci_hcd *xhci,
> + struct usb_device *udev,
> + struct xhci_command *command,
> + bool ctx_change, bool must_succeed)
> +{
> + int ret;
> + int timeleft;
> + unsigned long flags;
> + struct xhci_container_ctx *in_ctx;
> + struct completion *cmd_completion;
> + int *cmd_status;
> + struct xhci_virt_device *virt_dev;
> +
> + spin_lock_irqsave(&xhci->lock, flags);
> + virt_dev = xhci->devs[udev->slot_id];
> + if (command) {
> + in_ctx = command->in_ctx;
> + cmd_completion = command->completion;
> + cmd_status = &command->status;
> + command->command_trb = xhci->cmd_ring->enqueue;
> + list_add_tail(&command->cmd_list, &virt_dev->cmd_list);
> + } else {
> + in_ctx = virt_dev->in_ctx;
> + cmd_completion = &virt_dev->cmd_completion;
> + cmd_status = &virt_dev->cmd_status;
> + }
> +
> + if (!ctx_change)
> + ret = xhci_queue_configure_endpoint(xhci, in_ctx->dma,
> + udev->slot_id, must_succeed);
> + else
> + ret = xhci_queue_evaluate_context(xhci, in_ctx->dma,
> + udev->slot_id);
> + if (ret < 0) {
> + if (command)
> + list_del(&command->cmd_list);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + xhci_dbg(xhci, "FIXME allocate a new ring segment\n");
> + return -ENOMEM;
> + }
> + xhci_ring_cmd_db(xhci);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> +
> + /* Wait for the configure endpoint command to complete */
> + timeleft = wait_for_completion_interruptible_timeout(
> + cmd_completion,
> + USB_CTRL_SET_TIMEOUT);
> + if (timeleft <= 0) {
> + xhci_warn(xhci, "%s while waiting for %s command\n",
> + timeleft == 0 ? "Timeout" : "Signal",
> + ctx_change == 0 ?
> + "configure endpoint" :
> + "evaluate context");
> + /* FIXME cancel the configure endpoint command */
> + return -ETIME;
> + }
> +
> + if (!ctx_change)
> + return xhci_configure_endpoint_result(xhci, udev, cmd_status);
> + return xhci_evaluate_context_result(xhci, udev, cmd_status);
> +}
> +
> +/* Called after one or more calls to xhci_add_endpoint() or
> + * xhci_drop_endpoint(). If this call fails, the USB core is expected
> + * to call xhci_reset_bandwidth().
> + *
> + * Since we are in the middle of changing either configuration or
> + * installing a new alt setting, the USB core won't allow URBs to be
> + * enqueued for any endpoint on the old config or interface. Nothing
> + * else should be touching the xhci->devs[slot_id] structure, so we
> + * don't need to take the xhci->lock for manipulating that.
> + */
> +int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> + int i;
> + int ret = 0;
> + struct xhci_hcd *xhci;
> + struct xhci_virt_device *virt_dev;
> + struct xhci_input_control_ctx *ctrl_ctx;
> + struct xhci_slot_ctx *slot_ctx;
> +
> + ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> + if (ret <= 0)
> + return ret;
> + xhci = hcd_to_xhci(hcd);
> +
> + if (!udev->slot_id || !xhci->devs || !xhci->devs[udev->slot_id]) {
> + xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> + __func__);
> + return -EINVAL;
> + }
> + xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> + virt_dev = xhci->devs[udev->slot_id];
> +
> + /* See section 4.6.6 - A0 = 1; A1 = D0 = D1 = 0 */
> + ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> + ctrl_ctx->add_flags |= SLOT_FLAG;
> + ctrl_ctx->add_flags &= ~EP0_FLAG;
> + ctrl_ctx->drop_flags &= ~SLOT_FLAG;
> + ctrl_ctx->drop_flags &= ~EP0_FLAG;
> + xhci_dbg(xhci, "New Input Control Context:\n");
> + slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->in_ctx);
> + xhci_dbg_ctx(xhci, virt_dev->in_ctx,
> + LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
> +
> + ret = xhci_configure_endpoint(xhci, udev, NULL,
> + false, false);
> + if (ret) {
> + /* Callee should call reset_bandwidth() */
> + return ret;
> + }
> +
> + xhci_dbg(xhci, "Output context after successful config ep cmd:\n");
> + xhci_dbg_ctx(xhci, virt_dev->out_ctx,
> + LAST_CTX_TO_EP_NUM(slot_ctx->dev_info));
> +
> + xhci_zero_in_ctx(xhci, virt_dev);
> + /* Install new rings and free or cache any old rings */
> + for (i = 1; i < 31; ++i) {
> + if (!virt_dev->eps[i].new_ring)
> + continue;
> + /* Only cache or free the old ring if it exists.
> + * It may not if this is the first add of an endpoint.
> + */
> + if (virt_dev->eps[i].ring) {
> + xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
> + }
> + virt_dev->eps[i].ring = virt_dev->eps[i].new_ring;
> + virt_dev->eps[i].new_ring = NULL;
> + }
> +
> + return ret;
> +}
> +
> +void xhci_reset_bandwidth(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> + struct xhci_hcd *xhci;
> + struct xhci_virt_device *virt_dev;
> + int i, ret;
> +
> + ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> + if (ret <= 0)
> + return;
> + xhci = hcd_to_xhci(hcd);
> +
> + if (!xhci->devs || !xhci->devs[udev->slot_id]) {
> + xhci_warn(xhci, "xHCI %s called with unaddressed device\n",
> + __func__);
> + return;
> + }
> + xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
> + virt_dev = xhci->devs[udev->slot_id];
> + /* Free any rings allocated for added endpoints */
> + for (i = 0; i < 31; ++i) {
> + if (virt_dev->eps[i].new_ring) {
> + xhci_ring_free(xhci, virt_dev->eps[i].new_ring);
> + virt_dev->eps[i].new_ring = NULL;
> + }
> + }
> + xhci_zero_in_ctx(xhci, virt_dev);
> +}
> +
> +static void xhci_setup_input_ctx_for_config_ep(struct xhci_hcd *xhci,
> + struct xhci_container_ctx *in_ctx,
> + struct xhci_container_ctx *out_ctx,
> + u32 add_flags, u32 drop_flags)
> +{
> + struct xhci_input_control_ctx *ctrl_ctx;
> + ctrl_ctx = xhci_get_input_control_ctx(xhci, in_ctx);
> + ctrl_ctx->add_flags = add_flags;
> + ctrl_ctx->drop_flags = drop_flags;
> + xhci_slot_copy(xhci, in_ctx, out_ctx);
> + ctrl_ctx->add_flags |= SLOT_FLAG;
> +
> + xhci_dbg(xhci, "Input Context:\n");
> + xhci_dbg_ctx(xhci, in_ctx, xhci_last_valid_endpoint(add_flags));
> +}
> +
> +void xhci_setup_input_ctx_for_quirk(struct xhci_hcd *xhci,
> + unsigned int slot_id, unsigned int ep_index,
> + struct xhci_dequeue_state *deq_state)
> +{
> + struct xhci_container_ctx *in_ctx;
> + struct xhci_ep_ctx *ep_ctx;
> + u32 added_ctxs;
> + dma_addr_t addr;
> +
> + xhci_endpoint_copy(xhci, xhci->devs[slot_id]->in_ctx,
> + xhci->devs[slot_id]->out_ctx, ep_index);
> + in_ctx = xhci->devs[slot_id]->in_ctx;
> + ep_ctx = xhci_get_ep_ctx(xhci, in_ctx, ep_index);
> + addr = xhci_trb_virt_to_dma(deq_state->new_deq_seg,
> + deq_state->new_deq_ptr);
> + if (addr == 0) {
> + xhci_warn(xhci, "WARN Cannot submit config ep after "
> + "reset ep command\n");
> + xhci_warn(xhci, "WARN deq seg = %p, deq ptr = %p\n",
> + deq_state->new_deq_seg,
> + deq_state->new_deq_ptr);
> + return;
> + }
> + ep_ctx->deq = addr | deq_state->new_cycle_state;
> +
> + added_ctxs = xhci_get_endpoint_flag_from_index(ep_index);
> + xhci_setup_input_ctx_for_config_ep(xhci, xhci->devs[slot_id]->in_ctx,
> + xhci->devs[slot_id]->out_ctx, added_ctxs, added_ctxs);
> +}
> +
> +void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
> + struct usb_device *udev, unsigned int ep_index)
> +{
> + struct xhci_dequeue_state deq_state;
> + struct xhci_virt_ep *ep;
> +
> + xhci_dbg(xhci, "Cleaning up stalled endpoint ring\n");
> + ep = &xhci->devs[udev->slot_id]->eps[ep_index];
> + /* We need to move the HW's dequeue pointer past this TD,
> + * or it will attempt to resend it on the next doorbell ring.
> + */
> + xhci_find_new_dequeue_state(xhci, udev->slot_id,
> + ep_index, ep->stopped_td,
> + &deq_state);
> +
> + /* HW with the reset endpoint quirk will use the saved dequeue state to
> + * issue a configure endpoint command later.
> + */
> + if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) {
> + xhci_dbg(xhci, "Queueing new dequeue state\n");
> + xhci_queue_new_dequeue_state(xhci, udev->slot_id,
> + ep_index, &deq_state);
> + } else {
> + /* Better hope no one uses the input context between now and the
> + * reset endpoint completion!
> + */
> + xhci_dbg(xhci, "Setting up input context for "
> + "configure endpoint command\n");
> + xhci_setup_input_ctx_for_quirk(xhci, udev->slot_id,
> + ep_index, &deq_state);
> + }
> +}
> +
> +/* Deal with stalled endpoints. The core should have sent the control message
> + * to clear the halt condition. However, we need to make the xHCI hardware
> + * reset its sequence number, since a device will expect a sequence number of
> + * zero after the halt condition is cleared.
> + * Context: in_interrupt
> + */
> +void xhci_endpoint_reset(struct usb_hcd *hcd,
> + struct usb_host_endpoint *ep)
> +{
> + struct xhci_hcd *xhci;
> + struct usb_device *udev;
> + unsigned int ep_index;
> + unsigned long flags;
> + int ret;
> + struct xhci_virt_ep *virt_ep;
> +
> + xhci = hcd_to_xhci(hcd);
> + udev = (struct usb_device *) ep->hcpriv;
> + /* Called with a root hub endpoint (or an endpoint that wasn't added
> + * with xhci_add_endpoint()
> + */
> + if (!ep->hcpriv)
> + return;
> + ep_index = xhci_get_endpoint_index(&ep->desc);
> + virt_ep = &xhci->devs[udev->slot_id]->eps[ep_index];
> + if (!virt_ep->stopped_td) {
> + xhci_dbg(xhci, "Endpoint 0x%x not halted, refusing to reset.\n",
> + ep->desc.bEndpointAddress);
> + return;
> + }
> + if (usb_endpoint_xfer_control(&ep->desc)) {
> + xhci_dbg(xhci, "Control endpoint stall already handled.\n");
> + return;
> + }
> +
> + xhci_dbg(xhci, "Queueing reset endpoint command\n");
> + spin_lock_irqsave(&xhci->lock, flags);
> + ret = xhci_queue_reset_ep(xhci, udev->slot_id, ep_index);
> + /*
> + * Can't change the ring dequeue pointer until it's transitioned to the
> + * stopped state, which is only upon a successful reset endpoint
> + * command. Better hope that last command worked!
> + */
> + if (!ret) {
> + xhci_cleanup_stalled_ring(xhci, udev, ep_index);
> + kfree(virt_ep->stopped_td);
> + xhci_ring_cmd_db(xhci);
> + }
> + spin_unlock_irqrestore(&xhci->lock, flags);
> +
> + if (ret)
> + xhci_warn(xhci, "FIXME allocate a new ring segment\n");
> +}
> +
> +/*
> + * This submits a Reset Device Command, which will set the device state to 0,
> + * set the device address to 0, and disable all the endpoints except the default
> + * control endpoint. The USB core should come back and call
> + * xhci_address_device(), and then re-set up the configuration. If this is
> + * called because of a usb_reset_and_verify_device(), then the old alternate
> + * settings will be re-installed through the normal bandwidth allocation
> + * functions.
> + *
> + * Wait for the Reset Device command to finish. Remove all structures
> + * associated with the endpoints that were disabled. Clear the input device
> + * structure? Cache the rings? Reset the control endpoint 0 max packet size?
> + */
> +int xhci_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> + int ret, i;
> + unsigned long flags;
> + struct xhci_hcd *xhci;
> + unsigned int slot_id;
> + struct xhci_virt_device *virt_dev;
> + struct xhci_command *reset_device_cmd;
> + int timeleft;
> + int last_freed_endpoint;
> +
> + ret = xhci_check_args(hcd, udev, NULL, 0, __func__);
> + if (ret <= 0)
> + return ret;
> + xhci = hcd_to_xhci(hcd);
> + slot_id = udev->slot_id;
> + virt_dev = xhci->devs[slot_id];
> + if (!virt_dev) {
> + xhci_dbg(xhci, "%s called with invalid slot ID %u\n",
> + __func__, slot_id);
> + return -EINVAL;
> + }
> +
> + xhci_dbg(xhci, "Resetting device with slot ID %u\n", slot_id);
> + /* Allocate the command structure that holds the struct completion.
> + * Assume we're in process context, since the normal device reset
> + * process has to wait for the device anyway. Storage devices are
> + * reset as part of error handling, so use GFP_NOIO instead of
> + * GFP_KERNEL.
> + */
> + reset_device_cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
> + if (!reset_device_cmd) {
> + xhci_dbg(xhci, "Couldn't allocate command structure.\n");
> + return -ENOMEM;
> + }
> +
> + /* Attempt to submit the Reset Device command to the command ring */
> + spin_lock_irqsave(&xhci->lock, flags);
> + reset_device_cmd->command_trb = xhci->cmd_ring->enqueue;
> + list_add_tail(&reset_device_cmd->cmd_list, &virt_dev->cmd_list);
> + ret = xhci_queue_reset_device(xhci, slot_id);
> + if (ret) {
> + xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> + list_del(&reset_device_cmd->cmd_list);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + goto command_cleanup;
> + }
> + xhci_ring_cmd_db(xhci);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> +
> + /* Wait for the Reset Device command to finish */
> + timeleft = wait_for_completion_interruptible_timeout(
> + reset_device_cmd->completion,
> + USB_CTRL_SET_TIMEOUT);
> + if (timeleft <= 0) {
> + xhci_warn(xhci, "%s while waiting for reset device command\n",
> + timeleft == 0 ? "Timeout" : "Signal");
> + spin_lock_irqsave(&xhci->lock, flags);
> + /* The timeout might have raced with the event ring handler, so
> + * only delete from the list if the item isn't poisoned.
> + */
> + if (reset_device_cmd->cmd_list.next != LIST_POISON1)
> + list_del(&reset_device_cmd->cmd_list);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + ret = -ETIME;
> + goto command_cleanup;
> + }
> +
> + /* The Reset Device command can't fail, according to the 0.95/0.96 spec,
> + * unless we tried to reset a slot ID that wasn't enabled,
> + * or the device wasn't in the addressed or configured state.
> + */
> + ret = reset_device_cmd->status;
> + switch (ret) {
> + case COMP_EBADSLT: /* 0.95 completion code for bad slot ID */
> + case COMP_CTX_STATE: /* 0.96 completion code for same thing */
> + xhci_info(xhci, "Can't reset device (slot ID %u) in %s state\n",
> + slot_id,
> + xhci_get_slot_state(xhci, virt_dev->out_ctx));
> + xhci_info(xhci, "Not freeing device rings.\n");
> + /* Don't treat this as an error. May change my mind later. */
> + ret = 0;
> + goto command_cleanup;
> + case COMP_SUCCESS:
> + xhci_dbg(xhci, "Successful reset device command.\n");
> + break;
> + default:
> + if (xhci_is_vendor_info_code(xhci, ret))
> + break;
> + xhci_warn(xhci, "Unknown completion code %u for "
> + "reset device command.\n", ret);
> + ret = -EINVAL;
> + goto command_cleanup;
> + }
> +
> + /* Everything but endpoint 0 is disabled, so free or cache the rings. */
> + last_freed_endpoint = 1;
> + for (i = 1; i < 31; ++i) {
> + if (!virt_dev->eps[i].ring)
> + continue;
> + xhci_free_or_cache_endpoint_ring(xhci, virt_dev, i);
> + last_freed_endpoint = i;
> + }
> + xhci_dbg(xhci, "Output context after successful reset device cmd:\n");
> + xhci_dbg_ctx(xhci, virt_dev->out_ctx, last_freed_endpoint);
> + ret = 0;
> +
> +command_cleanup:
> + xhci_free_command(xhci, reset_device_cmd);
> + return ret;
> +}
> +
> +/*
> + * At this point, the struct usb_device is about to go away, the device has
> + * disconnected, and all traffic has been stopped and the endpoints have been
> + * disabled. Free any HC data structures associated with that device.
> + */
> +void xhci_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + struct xhci_virt_device *virt_dev;
> + unsigned long flags;
> + u32 state;
> + int i;
> +
> + if (udev->slot_id == 0)
> + return;
> + virt_dev = xhci->devs[udev->slot_id];
> + if (!virt_dev)
> + return;
> +
> + /* Stop any wayward timer functions (which may grab the lock) */
> + for (i = 0; i < 31; ++i) {
> + virt_dev->eps[i].ep_state &= ~EP_HALT_PENDING;
> + del_timer_sync(&virt_dev->eps[i].stop_cmd_timer);
> + }
> +
> + spin_lock_irqsave(&xhci->lock, flags);
> + /* Don't disable the slot if the host controller is dead. */
> + state = xhci_readl(xhci, &xhci->op_regs->status);
> + if (state == 0xffffffff || (xhci->xhc_state & XHCI_STATE_DYING)) {
> + xhci_free_virt_device(xhci, udev->slot_id);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + return;
> + }
> +
> + if (xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id)) {
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> + return;
> + }
> + xhci_ring_cmd_db(xhci);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + /*
> + * Event command completion handler will free any data structures
> + * associated with the slot. XXX Can free sleep?
> + */
> +}
> +
> +/*
> + * Returns 0 if the xHC ran out of device slots, the Enable Slot command
> + * timed out, or allocating memory failed. Returns 1 on success.
> + */
> +int xhci_alloc_dev(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + unsigned long flags;
> + int timeleft;
> + int ret;
> +
> + spin_lock_irqsave(&xhci->lock, flags);
> + ret = xhci_queue_slot_control(xhci, TRB_ENABLE_SLOT, 0);
> + if (ret) {
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> + return 0;
> + }
> + xhci_ring_cmd_db(xhci);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> +
> + /* XXX: how much time for xHC slot assignment? */
> + timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
> + USB_CTRL_SET_TIMEOUT);
> + if (timeleft <= 0) {
> + xhci_warn(xhci, "%s while waiting for a slot\n",
> + timeleft == 0 ? "Timeout" : "Signal");
> + /* FIXME cancel the enable slot request */
> + return 0;
> + }
> +
> + if (!xhci->slot_id) {
> + xhci_err(xhci, "Error while assigning device slot ID\n");
> + return 0;
> + }
> + /* xhci_alloc_virt_device() does not touch rings; no need to lock */
> + if (!xhci_alloc_virt_device(xhci, xhci->slot_id, udev, GFP_KERNEL)) {
> + /* Disable slot, if we can do it without mem alloc */
> + xhci_warn(xhci, "Could not allocate xHCI USB device data structures\n");
> + spin_lock_irqsave(&xhci->lock, flags);
> + if (!xhci_queue_slot_control(xhci, TRB_DISABLE_SLOT, udev->slot_id))
> + xhci_ring_cmd_db(xhci);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + return 0;
> + }
> + udev->slot_id = xhci->slot_id;
> + /* Is this a LS or FS device under a HS hub? */
> + /* Hub or peripherial? */
> + return 1;
> +}
> +
> +/*
> + * Issue an Address Device command (which will issue a SetAddress request to
> + * the device).
> + * We should be protected by the usb_address0_mutex in khubd's hub_port_init, so
> + * we should only issue and wait on one address command at the same time.
> + *
> + * We add one to the device address issued by the hardware because the USB core
> + * uses address 1 for the root hubs (even though they're not really devices).
> + */
> +int xhci_address_device(struct usb_hcd *hcd, struct usb_device *udev)
> +{
> + unsigned long flags;
> + int timeleft;
> + struct xhci_virt_device *virt_dev;
> + int ret = 0;
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + struct xhci_slot_ctx *slot_ctx;
> + struct xhci_input_control_ctx *ctrl_ctx;
> + u64 temp_64;
> +
> + if (!udev->slot_id) {
> + xhci_dbg(xhci, "Bad Slot ID %d\n", udev->slot_id);
> + return -EINVAL;
> + }
> +
> + virt_dev = xhci->devs[udev->slot_id];
> +
> + /* If this is a Set Address to an unconfigured device, setup ep 0 */
> + if (!udev->config)
> + xhci_setup_addressable_virt_dev(xhci, udev);
> + /* Otherwise, assume the core has the device configured how it wants */
> + xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
> + xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
> +
> + spin_lock_irqsave(&xhci->lock, flags);
> + ret = xhci_queue_address_device(xhci, virt_dev->in_ctx->dma,
> + udev->slot_id);
> + if (ret) {
> + spin_unlock_irqrestore(&xhci->lock, flags);
> + xhci_dbg(xhci, "FIXME: allocate a command ring segment\n");
> + return ret;
> + }
> + xhci_ring_cmd_db(xhci);
> + spin_unlock_irqrestore(&xhci->lock, flags);
> +
> + /* ctrl tx can take up to 5 sec; XXX: need more time for xHC? */
> + timeleft = wait_for_completion_interruptible_timeout(&xhci->addr_dev,
> + USB_CTRL_SET_TIMEOUT);
> + /* FIXME: From section 4.3.4: "Software shall be responsible for timing
> + * the SetAddress() "recovery interval" required by USB and aborting the
> + * command on a timeout.
> + */
> + if (timeleft <= 0) {
> + xhci_warn(xhci, "%s while waiting for a slot\n",
> + timeleft == 0 ? "Timeout" : "Signal");
> + /* FIXME cancel the address device command */
> + return -ETIME;
> + }
> +
> + switch (virt_dev->cmd_status) {
> + case COMP_CTX_STATE:
> + case COMP_EBADSLT:
> + xhci_err(xhci, "Setup ERROR: address device command for slot %d.\n",
> + udev->slot_id);
> + ret = -EINVAL;
> + break;
> + case COMP_TX_ERR:
> + dev_warn(&udev->dev, "Device not responding to set address.\n");
> + ret = -EPROTO;
> + break;
> + case COMP_SUCCESS:
> + xhci_dbg(xhci, "Successful Address Device command\n");
> + break;
> + default:
> + xhci_err(xhci, "ERROR: unexpected command completion "
> + "code 0x%x.\n", virt_dev->cmd_status);
> + xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
> + xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
> + ret = -EINVAL;
> + break;
> + }
> + if (ret) {
> + return ret;
> + }
> + temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr);
> + xhci_dbg(xhci, "Op regs DCBAA ptr = %#016llx\n", temp_64);
> + xhci_dbg(xhci, "Slot ID %d dcbaa entry @%p = %#016llx\n",
> + udev->slot_id,
> + &xhci->dcbaa->dev_context_ptrs[udev->slot_id],
> + (unsigned long long)
> + xhci->dcbaa->dev_context_ptrs[udev->slot_id]);
> + xhci_dbg(xhci, "Output Context DMA address = %#08llx\n",
> + (unsigned long long)virt_dev->out_ctx->dma);
> + xhci_dbg(xhci, "Slot ID %d Input Context:\n", udev->slot_id);
> + xhci_dbg_ctx(xhci, virt_dev->in_ctx, 2);
> + xhci_dbg(xhci, "Slot ID %d Output Context:\n", udev->slot_id);
> + xhci_dbg_ctx(xhci, virt_dev->out_ctx, 2);
> + /*
> + * USB core uses address 1 for the roothubs, so we add one to the
> + * address given back to us by the HC.
> + */
> + slot_ctx = xhci_get_slot_ctx(xhci, virt_dev->out_ctx);
> + udev->devnum = (slot_ctx->dev_state & DEV_ADDR_MASK) + 1;
> + /* Zero the input context control for later use */
> + ctrl_ctx = xhci_get_input_control_ctx(xhci, virt_dev->in_ctx);
> + ctrl_ctx->add_flags = 0;
> + ctrl_ctx->drop_flags = 0;
> +
> + xhci_dbg(xhci, "Device address = %d\n", udev->devnum);
> + /* XXX Meh, not sure if anyone else but choose_address uses this. */
> + set_bit(udev->devnum, udev->bus->devmap.devicemap);
> +
> + return 0;
> +}
> +
> +/* Once a hub descriptor is fetched for a device, we need to update the xHC's
> + * internal data structures for the device.
> + */
> +int xhci_update_hub_device(struct usb_hcd *hcd, struct usb_device *hdev,
> + struct usb_tt *tt, gfp_t mem_flags)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + struct xhci_virt_device *vdev;
> + struct xhci_command *config_cmd;
> + struct xhci_input_control_ctx *ctrl_ctx;
> + struct xhci_slot_ctx *slot_ctx;
> + unsigned long flags;
> + unsigned think_time;
> + int ret;
> +
> + /* Ignore root hubs */
> + if (!hdev->parent)
> + return 0;
> +
> + vdev = xhci->devs[hdev->slot_id];
> + if (!vdev) {
> + xhci_warn(xhci, "Cannot update hub desc for unknown device.\n");
> + return -EINVAL;
> + }
> + config_cmd = xhci_alloc_command(xhci, true, true, mem_flags);
> + if (!config_cmd) {
> + xhci_dbg(xhci, "Could not allocate xHCI command structure.\n");
> + return -ENOMEM;
> + }
> +
> + spin_lock_irqsave(&xhci->lock, flags);
> + xhci_slot_copy(xhci, config_cmd->in_ctx, vdev->out_ctx);
> + ctrl_ctx = xhci_get_input_control_ctx(xhci, config_cmd->in_ctx);
> + ctrl_ctx->add_flags |= SLOT_FLAG;
> + slot_ctx = xhci_get_slot_ctx(xhci, config_cmd->in_ctx);
> + slot_ctx->dev_info |= DEV_HUB;
> + if (tt->multi)
> + slot_ctx->dev_info |= DEV_MTT;
> + if (xhci->hci_version > 0x95) {
> + xhci_dbg(xhci, "xHCI version %x needs hub "
> + "TT think time and number of ports\n",
> + (unsigned int) xhci->hci_version);
> + slot_ctx->dev_info2 |= XHCI_MAX_PORTS(hdev->maxchild);
> + /* Set TT think time - convert from ns to FS bit times.
> + * 0 = 8 FS bit times, 1 = 16 FS bit times,
> + * 2 = 24 FS bit times, 3 = 32 FS bit times.
> + */
> + think_time = tt->think_time;
> + if (think_time != 0)
> + think_time = (think_time / 666) - 1;
> + slot_ctx->tt_info |= TT_THINK_TIME(think_time);
> + } else {
> + xhci_dbg(xhci, "xHCI version %x doesn't need hub "
> + "TT think time or number of ports\n",
> + (unsigned int) xhci->hci_version);
> + }
> + slot_ctx->dev_state = 0;
> + spin_unlock_irqrestore(&xhci->lock, flags);
> +
> + xhci_dbg(xhci, "Set up %s for hub device.\n",
> + (xhci->hci_version > 0x95) ?
> + "configure endpoint" : "evaluate context");
> + xhci_dbg(xhci, "Slot %u Input Context:\n", hdev->slot_id);
> + xhci_dbg_ctx(xhci, config_cmd->in_ctx, 0);
> +
> + /* Issue and wait for the configure endpoint or
> + * evaluate context command.
> + */
> + if (xhci->hci_version > 0x95)
> + ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
> + false, false);
> + else
> + ret = xhci_configure_endpoint(xhci, hdev, config_cmd,
> + true, false);
> +
> + xhci_dbg(xhci, "Slot %u Output Context:\n", hdev->slot_id);
> + xhci_dbg_ctx(xhci, vdev->out_ctx, 0);
> +
> + xhci_free_command(xhci, config_cmd);
> + return ret;
> +}
> +
> +int xhci_get_frame(struct usb_hcd *hcd)
> +{
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + /* EHCI mods by the periodic size. Why? */
> + return xhci_readl(xhci, &xhci->run_regs->microframe_index) >> 3;
> +}
> +
> +MODULE_DESCRIPTION(DRIVER_DESC);
> +MODULE_AUTHOR(DRIVER_AUTHOR);
> +MODULE_LICENSE("GPL");
> +
> +static int __init xhci_hcd_init(void)
> +{
> +#ifdef CONFIG_PCI
> + int retval = 0;
> +
> + retval = xhci_register_pci();
> +
> + if (retval < 0) {
> + printk(KERN_DEBUG "Problem registering PCI driver.");
> + return retval;
> + }
> +#endif
> + /*
> + * Check the compiler generated sizes of structures that must be laid
> + * out in specific ways for hardware access.
> + */
> + BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
> + BUILD_BUG_ON(sizeof(struct xhci_slot_ctx) != 8*32/8);
> + BUILD_BUG_ON(sizeof(struct xhci_ep_ctx) != 8*32/8);
> + /* xhci_device_control has eight fields, and also
> + * embeds one xhci_slot_ctx and 31 xhci_ep_ctx
> + */
> + BUILD_BUG_ON(sizeof(struct xhci_stream_ctx) != 4*32/8);
> + BUILD_BUG_ON(sizeof(union xhci_trb) != 4*32/8);
> + BUILD_BUG_ON(sizeof(struct xhci_erst_entry) != 4*32/8);
> + BUILD_BUG_ON(sizeof(struct xhci_cap_regs) != 7*32/8);
> + BUILD_BUG_ON(sizeof(struct xhci_intr_reg) != 8*32/8);
> + /* xhci_run_regs has eight fields and embeds 128 xhci_intr_regs */
> + BUILD_BUG_ON(sizeof(struct xhci_run_regs) != (8+8*128)*32/8);
> + BUILD_BUG_ON(sizeof(struct xhci_doorbell_array) != 256*32/8);
> + return 0;
> +}
> +module_init(xhci_hcd_init);
> +
> +static void __exit xhci_hcd_cleanup(void)
> +{
> +#ifdef CONFIG_PCI
> + xhci_unregister_pci();
> +#endif
> +}
> +module_exit(xhci_hcd_cleanup);
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