Re: [PATCH v3 20/27] powerpc/powernv/pmem: Forward events to userspace
From: Andrew Donnellan
Date: Tue Mar 03 2020 - 02:03:13 EST
On 21/2/20 2:27 pm, Alastair D'Silva wrote:> @@ -938,6 +955,51 @@ static
int ioctl_controller_stats(struct ocxlpmem *ocxlpmem,
return rc;
}
+static int ioctl_eventfd(struct ocxlpmem *ocxlpmem,
+ struct ioctl_ocxl_pmem_eventfd __user *uarg)
+{
+ struct ioctl_ocxl_pmem_eventfd args;
+
+ if (copy_from_user(&args, uarg, sizeof(args)))
+ return -EFAULT;
+
+ if (ocxlpmem->ev_ctx)
+ return -EINVAL;
I think EBUSY is more appropriate here.
+
+ ocxlpmem->ev_ctx = eventfd_ctx_fdget(args.eventfd);
+ if (!ocxlpmem->ev_ctx)
+ return -EFAULT;
+
+ return 0;
+}
+
+static int ioctl_event_check(struct ocxlpmem *ocxlpmem, u64 __user *uarg)
+{
+ u64 val = 0;
+ int rc;
+ u64 chi = 0;
+
+ rc = ocxlpmem_chi(ocxlpmem, &chi);
+ if (rc < 0)
+ return rc;
+
+ if (chi & GLOBAL_MMIO_CHI_ELA)
+ val |= IOCTL_OCXL_PMEM_EVENT_ERROR_LOG_AVAILABLE;
+
+ if (chi & GLOBAL_MMIO_CHI_CDA)
+ val |= IOCTL_OCXL_PMEM_EVENT_CONTROLLER_DUMP_AVAILABLE;
+
+ if (chi & GLOBAL_MMIO_CHI_CFFS)
+ val |= IOCTL_OCXL_PMEM_EVENT_FIRMWARE_FATAL;
+
+ if (chi & GLOBAL_MMIO_CHI_CHFS)
+ val |= IOCTL_OCXL_PMEM_EVENT_HARDWARE_FATAL;
+
+ rc = copy_to_user((u64 __user *) uarg, &val, sizeof(val));
+
+ return rc;
+}
+
static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
{
struct ocxlpmem *ocxlpmem = file->private_data;
@@ -966,6 +1028,15 @@ static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
rc = ioctl_controller_stats(ocxlpmem,
(struct ioctl_ocxl_pmem_controller_stats __user *)args);
break;
+
+ case IOCTL_OCXL_PMEM_EVENTFD:
+ rc = ioctl_eventfd(ocxlpmem,
+ (struct ioctl_ocxl_pmem_eventfd __user *)args);
+ break;
+
+ case IOCTL_OCXL_PMEM_EVENT_CHECK:
+ rc = ioctl_event_check(ocxlpmem, (u64 __user *)args);
+ break;
}
return rc;
@@ -1107,6 +1178,146 @@ static void dump_error_log(struct ocxlpmem *ocxlpmem)
kfree(buf);
}
+static irqreturn_t imn0_handler(void *private)
+{
+ struct ocxlpmem *ocxlpmem = private;
+ u64 chi = 0;
+
+ (void)ocxlpmem_chi(ocxlpmem, &chi);
+
+ if (chi & GLOBAL_MMIO_CHI_ELA) {
+ dev_warn(&ocxlpmem->dev, "Error log is available\n");
+
+ if (ocxlpmem->ev_ctx)
+ eventfd_signal(ocxlpmem->ev_ctx, 1);
+ }
+
+ if (chi & GLOBAL_MMIO_CHI_CDA) {
+ dev_warn(&ocxlpmem->dev, "Controller dump is available\n");
+
+ if (ocxlpmem->ev_ctx)
+ eventfd_signal(ocxlpmem->ev_ctx, 1);
+ }
+
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t imn1_handler(void *private)
+{
+ struct ocxlpmem *ocxlpmem = private;
+ u64 chi = 0;
+
+ (void)ocxlpmem_chi(ocxlpmem, &chi);
+
+ if (chi & (GLOBAL_MMIO_CHI_CFFS | GLOBAL_MMIO_CHI_CHFS)) {
+ dev_err(&ocxlpmem->dev,
+ "Controller status is fatal, chi=0x%llx, going offline\n", chi);
+
+ if (ocxlpmem->nvdimm_bus) {
+ nvdimm_bus_unregister(ocxlpmem->nvdimm_bus);
+ ocxlpmem->nvdimm_bus = NULL;
+ }
+
+ if (ocxlpmem->ev_ctx)
+ eventfd_signal(ocxlpmem->ev_ctx, 1);
+ }
+
+ return IRQ_HANDLED;
+}
+
+
+/**
+ * ocxlpmem_setup_irq() - Set up the IRQs for the OpenCAPI Persistent Memory device
+ * @ocxlpmem: the device metadata
+ * Return: 0 on success, negative on failure
+ */
+static int ocxlpmem_setup_irq(struct ocxlpmem *ocxlpmem)
+{
+ int rc;
+ u64 irq_addr;
+
+ rc = ocxl_afu_irq_alloc(ocxlpmem->ocxl_context, &ocxlpmem->irq_id[0]);
+ if (rc)
+ return rc;
+
+ rc = ocxl_irq_set_handler(ocxlpmem->ocxl_context, ocxlpmem->irq_id[0],
+ imn0_handler, NULL, ocxlpmem);
+
+ irq_addr = ocxl_afu_irq_get_addr(ocxlpmem->ocxl_context, ocxlpmem->irq_id[0]);
+ if (!irq_addr)
+ return -EINVAL;
+
+ ocxlpmem->irq_addr[0] = ioremap(irq_addr, PAGE_SIZE);
+ if (!ocxlpmem->irq_addr[0])
+ return -EINVAL;
Something other than EINVAL for these two
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_IMA0_OHP,
+ OCXL_LITTLE_ENDIAN,
+ (u64)ocxlpmem->irq_addr[0]);
+ if (rc)
+ goto out_irq0;
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_IMA0_CFP,
+ OCXL_LITTLE_ENDIAN, 0);
+ if (rc)
+ goto out_irq0;
+
+ rc = ocxl_afu_irq_alloc(ocxlpmem->ocxl_context, &ocxlpmem->irq_id[1]);
+ if (rc)
+ goto out_irq0;
+
+
+ rc = ocxl_irq_set_handler(ocxlpmem->ocxl_context, ocxlpmem->irq_id[1],
+ imn1_handler, NULL, ocxlpmem);
+ if (rc)
+ goto out_irq0;
+
+ irq_addr = ocxl_afu_irq_get_addr(ocxlpmem->ocxl_context, ocxlpmem->irq_id[1]);
+ if (!irq_addr) {
+ rc = -EFAULT;
+ goto out_irq0;
+ }
+
+ ocxlpmem->irq_addr[1] = ioremap(irq_addr, PAGE_SIZE);
+ if (!ocxlpmem->irq_addr[1]) {
+ rc = -EINVAL;
+ goto out_irq0;
+ }
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_IMA1_OHP,
+ OCXL_LITTLE_ENDIAN,
+ (u64)ocxlpmem->irq_addr[1]);
+ if (rc)
+ goto out_irq1;
+
+ rc = ocxl_global_mmio_write64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_IMA1_CFP,
+ OCXL_LITTLE_ENDIAN, 0);
+ if (rc)
+ goto out_irq1;
+
+ // Enable doorbells
+ rc = ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_CHIE,
+ OCXL_LITTLE_ENDIAN,
+ GLOBAL_MMIO_CHI_ELA | GLOBAL_MMIO_CHI_CDA |
+ GLOBAL_MMIO_CHI_CFFS | GLOBAL_MMIO_CHI_CHFS |
+ GLOBAL_MMIO_CHI_NSCRA);
We don't actually do anything in the handlers with NSCRA...
+ if (rc)
+ goto out_irq1;
+
+ return 0;
+
+out_irq1:
+ iounmap(ocxlpmem->irq_addr[1]);
+ ocxlpmem->irq_addr[1] = NULL;
+
+out_irq0:
+ iounmap(ocxlpmem->irq_addr[0]);
+ ocxlpmem->irq_addr[0] = NULL;
+
+ return rc;
+}
+
/**
* probe_function0() - Set up function 0 for an OpenCAPI persistent memory device
* This is important as it enables templates higher than 0 across all other functions,
@@ -1216,6 +1427,11 @@ static int probe(struct pci_dev *pdev, const struct pci_device_id *ent)
goto err;
}
+ if (ocxlpmem_setup_irq(ocxlpmem)) {
+ dev_err(&pdev->dev, "Could not set up OCXL IRQs\n");
+ goto err;
+ }
+
if (setup_command_metadata(ocxlpmem)) {
dev_err(&pdev->dev, "Could not read OCXL command matada\n");
goto err;
diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
index b953ee522ed4..927690f4888f 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl_internal.h
@@ -103,6 +103,10 @@ struct ocxlpmem {
struct pci_dev *pdev;
struct cdev cdev;
struct ocxl_fn *ocxl_fn;
+#define SCM_IRQ_COUNT 2
+ int irq_id[SCM_IRQ_COUNT];
+ struct dev_pagemap irq_pgmap[SCM_IRQ_COUNT];
+ void *irq_addr[SCM_IRQ_COUNT];
I think this should be tagged __iomem
--
Andrew Donnellan OzLabs, ADL Canberra
ajd@xxxxxxxxxxxxx IBM Australia Limited