[PATCH 3/4] gpu: host1x: Rewrite syncpoint interrupt handling
From: Mikko Perttunen
Date: Thu Jan 19 2023 - 08:11:54 EST
From: Mikko Perttunen <mperttunen@xxxxxxxxxx>
Move from the old, complex intr handling code to a new implementation
based on dma_fences. While there is a fair bit of churn to get there,
the new implementation is much simpler and likely faster as well due
to allowing signaling directly from interrupt context.
Signed-off-by: Mikko Perttunen <mperttunen@xxxxxxxxxx>
---
drivers/gpu/host1x/debug.c | 7 +-
drivers/gpu/host1x/dev.c | 4 +-
drivers/gpu/host1x/dev.h | 10 +-
drivers/gpu/host1x/fence.c | 96 ++++-----
drivers/gpu/host1x/fence.h | 18 +-
drivers/gpu/host1x/hw/intr_hw.c | 74 ++-----
drivers/gpu/host1x/intr.c | 334 ++++++--------------------------
drivers/gpu/host1x/intr.h | 83 +-------
drivers/gpu/host1x/syncpt.h | 3 +-
9 files changed, 149 insertions(+), 480 deletions(-)
diff --git a/drivers/gpu/host1x/debug.c b/drivers/gpu/host1x/debug.c
index 6649b04b7131..a18cc8d8caf5 100644
--- a/drivers/gpu/host1x/debug.c
+++ b/drivers/gpu/host1x/debug.c
@@ -77,6 +77,7 @@ static int show_channel(struct host1x_channel *ch, void *data, bool show_fifo)
static void show_syncpts(struct host1x *m, struct output *o, bool show_all)
{
+ unsigned long irqflags;
struct list_head *pos;
unsigned int i;
int err;
@@ -92,10 +93,10 @@ static void show_syncpts(struct host1x *m, struct output *o, bool show_all)
u32 min = host1x_syncpt_load(m->syncpt + i);
unsigned int waiters = 0;
- spin_lock(&m->syncpt[i].intr.lock);
- list_for_each(pos, &m->syncpt[i].intr.wait_head)
+ spin_lock_irqsave(&m->syncpt[i].fences.lock, irqflags);
+ list_for_each(pos, &m->syncpt[i].fences.list)
waiters++;
- spin_unlock(&m->syncpt[i].intr.lock);
+ spin_unlock_irqrestore(&m->syncpt[i].fences.lock, irqflags);
if (!kref_read(&m->syncpt[i].ref))
continue;
diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
index f31039aca03c..4872d183d860 100644
--- a/drivers/gpu/host1x/dev.c
+++ b/drivers/gpu/host1x/dev.c
@@ -516,7 +516,7 @@ static int host1x_probe(struct platform_device *pdev)
return PTR_ERR(host->regs);
}
- syncpt_irq = platform_get_irq(pdev, 0);
+ host->syncpt_irq = platform_get_irq(pdev, 0);
if (syncpt_irq < 0)
return syncpt_irq;
@@ -578,7 +578,7 @@ static int host1x_probe(struct platform_device *pdev)
goto free_contexts;
}
- err = host1x_intr_init(host, syncpt_irq);
+ err = host1x_intr_init(host);
if (err) {
dev_err(&pdev->dev, "failed to initialize interrupts\n");
goto deinit_syncpt;
diff --git a/drivers/gpu/host1x/dev.h b/drivers/gpu/host1x/dev.h
index 920e5548cfbc..75de50fe03d0 100644
--- a/drivers/gpu/host1x/dev.h
+++ b/drivers/gpu/host1x/dev.h
@@ -74,8 +74,7 @@ struct host1x_syncpt_ops {
};
struct host1x_intr_ops {
- int (*init_host_sync)(struct host1x *host, u32 cpm,
- void (*syncpt_thresh_work)(struct work_struct *work));
+ int (*init_host_sync)(struct host1x *host, u32 cpm);
void (*set_syncpt_threshold)(
struct host1x *host, unsigned int id, u32 thresh);
void (*enable_syncpt_intr)(struct host1x *host, unsigned int id);
@@ -125,6 +124,7 @@ struct host1x {
void __iomem *regs;
void __iomem *hv_regs; /* hypervisor region */
void __iomem *common_regs;
+ int syncpt_irq;
struct host1x_syncpt *syncpt;
struct host1x_syncpt_base *bases;
struct device *dev;
@@ -138,7 +138,6 @@ struct host1x {
dma_addr_t iova_end;
struct mutex intr_mutex;
- int intr_syncpt_irq;
const struct host1x_syncpt_ops *syncpt_op;
const struct host1x_intr_ops *intr_op;
@@ -216,10 +215,9 @@ static inline void host1x_hw_syncpt_enable_protection(struct host1x *host)
return host->syncpt_op->enable_protection(host);
}
-static inline int host1x_hw_intr_init_host_sync(struct host1x *host, u32 cpm,
- void (*syncpt_thresh_work)(struct work_struct *))
+static inline int host1x_hw_intr_init_host_sync(struct host1x *host, u32 cpm)
{
- return host->intr_op->init_host_sync(host, cpm, syncpt_thresh_work);
+ return host->intr_op->init_host_sync(host, cpm);
}
static inline void host1x_hw_intr_set_syncpt_threshold(struct host1x *host,
diff --git a/drivers/gpu/host1x/fence.c b/drivers/gpu/host1x/fence.c
index df428bcbae69..df5b56692d2c 100644
--- a/drivers/gpu/host1x/fence.c
+++ b/drivers/gpu/host1x/fence.c
@@ -15,22 +15,6 @@
#include "intr.h"
#include "syncpt.h"
-static DEFINE_SPINLOCK(lock);
-
-struct host1x_syncpt_fence {
- struct dma_fence base;
-
- atomic_t signaling;
-
- struct host1x_syncpt *sp;
- u32 threshold;
-
- struct host1x_waitlist *waiter;
- void *waiter_ref;
-
- struct delayed_work timeout_work;
-};
-
static const char *host1x_syncpt_fence_get_driver_name(struct dma_fence *f)
{
return "host1x";
@@ -49,11 +33,12 @@ static struct host1x_syncpt_fence *to_host1x_fence(struct dma_fence *f)
static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f)
{
struct host1x_syncpt_fence *sf = to_host1x_fence(f);
- int err;
if (host1x_syncpt_is_expired(sf->sp, sf->threshold))
return false;
+ /* One reference for interrupt path, one for timeout path. */
+ dma_fence_get(f);
dma_fence_get(f);
/*
@@ -61,24 +46,13 @@ static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f)
* reference to any fences for which 'enable_signaling' has been
* called (and that have not been signalled).
*
- * We provide a userspace API to create arbitrary syncpoint fences,
- * so we cannot normally guarantee that all fences get signalled.
+ * We cannot (for now) normally guarantee that all fences get signalled.
* As such, setup a timeout, so that long-lasting fences will get
* reaped eventually.
*/
schedule_delayed_work(&sf->timeout_work, msecs_to_jiffies(30000));
- err = host1x_intr_add_action(sf->sp->host, sf->sp, sf->threshold,
- HOST1X_INTR_ACTION_SIGNAL_FENCE, f,
- sf->waiter, &sf->waiter_ref);
- if (err) {
- cancel_delayed_work_sync(&sf->timeout_work);
- dma_fence_put(f);
- return false;
- }
-
- /* intr framework takes ownership of waiter */
- sf->waiter = NULL;
+ host1x_intr_add_fence_locked(sf->sp->host, sf);
/*
* The fence may get signalled at any time after the above call,
@@ -89,37 +63,32 @@ static bool host1x_syncpt_fence_enable_signaling(struct dma_fence *f)
return true;
}
-static void host1x_syncpt_fence_release(struct dma_fence *f)
-{
- struct host1x_syncpt_fence *sf = to_host1x_fence(f);
-
- if (sf->waiter)
- kfree(sf->waiter);
-
- dma_fence_free(f);
-}
-
static const struct dma_fence_ops host1x_syncpt_fence_ops = {
.get_driver_name = host1x_syncpt_fence_get_driver_name,
.get_timeline_name = host1x_syncpt_fence_get_timeline_name,
.enable_signaling = host1x_syncpt_fence_enable_signaling,
- .release = host1x_syncpt_fence_release,
};
void host1x_fence_signal(struct host1x_syncpt_fence *f)
{
- if (atomic_xchg(&f->signaling, 1))
+ if (atomic_xchg(&f->signaling, 1)) {
+ /*
+ * Already on timeout path, but we removed the fence before
+ * timeout path could, so drop interrupt path reference.
+ */
+ dma_fence_put(&f->base);
return;
+ }
- /*
- * Cancel pending timeout work - if it races, it will
- * not get 'f->signaling' and return.
- */
- cancel_delayed_work_sync(&f->timeout_work);
-
- host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, false);
+ if (cancel_delayed_work(&f->timeout_work)) {
+ /*
+ * We know that the timeout path will not be entered.
+ * Safe to drop the timeout path's reference now.
+ */
+ dma_fence_put(&f->base);
+ }
- dma_fence_signal(&f->base);
+ dma_fence_signal_locked(&f->base);
dma_fence_put(&f->base);
}
@@ -129,17 +98,24 @@ static void do_fence_timeout(struct work_struct *work)
struct host1x_syncpt_fence *f =
container_of(dwork, struct host1x_syncpt_fence, timeout_work);
- if (atomic_xchg(&f->signaling, 1))
+ if (atomic_xchg(&f->signaling, 1)) {
+ /* Already on interrupt path, drop timeout path reference. */
+ dma_fence_put(&f->base);
return;
+ }
- /*
- * Cancel pending timeout work - if it races, it will
- * not get 'f->signaling' and return.
- */
- host1x_intr_put_ref(f->sp->host, f->sp->id, f->waiter_ref, true);
+ if (host1x_intr_remove_fence(f->sp->host, f)) {
+ /*
+ * Managed to remove fence from queue, so it's safe to drop
+ * the interrupt path's reference.
+ */
+ dma_fence_put(&f->base);
+ }
dma_fence_set_error(&f->base, -ETIMEDOUT);
dma_fence_signal(&f->base);
+
+ /* Drop timeout path reference. */
dma_fence_put(&f->base);
}
@@ -151,16 +127,10 @@ struct dma_fence *host1x_fence_create(struct host1x_syncpt *sp, u32 threshold)
if (!fence)
return ERR_PTR(-ENOMEM);
- fence->waiter = kzalloc(sizeof(*fence->waiter), GFP_KERNEL);
- if (!fence->waiter) {
- kfree(fence);
- return ERR_PTR(-ENOMEM);
- }
-
fence->sp = sp;
fence->threshold = threshold;
- dma_fence_init(&fence->base, &host1x_syncpt_fence_ops, &lock,
+ dma_fence_init(&fence->base, &host1x_syncpt_fence_ops, &sp->fences.lock,
dma_fence_context_alloc(1), 0);
INIT_DELAYED_WORK(&fence->timeout_work, do_fence_timeout);
diff --git a/drivers/gpu/host1x/fence.h b/drivers/gpu/host1x/fence.h
index 70c91de82f14..4352d046f92c 100644
--- a/drivers/gpu/host1x/fence.h
+++ b/drivers/gpu/host1x/fence.h
@@ -6,7 +6,23 @@
#ifndef HOST1X_FENCE_H
#define HOST1X_FENCE_H
-struct host1x_syncpt_fence;
+struct host1x_syncpt_fence {
+ struct dma_fence base;
+
+ atomic_t signaling;
+
+ struct host1x_syncpt *sp;
+ u32 threshold;
+
+ struct delayed_work timeout_work;
+
+ struct list_head list;
+};
+
+struct host1x_fence_list {
+ spinlock_t lock;
+ struct list_head list;
+};
void host1x_fence_signal(struct host1x_syncpt_fence *fence);
diff --git a/drivers/gpu/host1x/hw/intr_hw.c b/drivers/gpu/host1x/hw/intr_hw.c
index 9acccdb139e6..b915ef7d0348 100644
--- a/drivers/gpu/host1x/hw/intr_hw.c
+++ b/drivers/gpu/host1x/hw/intr_hw.c
@@ -13,23 +13,6 @@
#include "../intr.h"
#include "../dev.h"
-/*
- * Sync point threshold interrupt service function
- * Handles sync point threshold triggers, in interrupt context
- */
-static void host1x_intr_syncpt_handle(struct host1x_syncpt *syncpt)
-{
- unsigned int id = syncpt->id;
- struct host1x *host = syncpt->host;
-
- host1x_sync_writel(host, BIT(id % 32),
- HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(id / 32));
- host1x_sync_writel(host, BIT(id % 32),
- HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
-
- schedule_work(&syncpt->intr.work);
-}
-
static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
{
struct host1x *host = dev_id;
@@ -39,17 +22,20 @@ static irqreturn_t syncpt_thresh_isr(int irq, void *dev_id)
for (i = 0; i < DIV_ROUND_UP(host->info->nb_pts, 32); i++) {
reg = host1x_sync_readl(host,
HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
- for_each_set_bit(id, ®, 32) {
- struct host1x_syncpt *syncpt =
- host->syncpt + (i * 32 + id);
- host1x_intr_syncpt_handle(syncpt);
- }
+
+ host1x_sync_writel(host, reg,
+ HOST1X_SYNC_SYNCPT_THRESH_INT_DISABLE(i));
+ host1x_sync_writel(host, reg,
+ HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(i));
+
+ for_each_set_bit(id, ®, 32)
+ host1x_intr_handle_interrupt(host, i * 32 + id);
}
return IRQ_HANDLED;
}
-static void _host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
+static void host1x_intr_disable_all_syncpt_intrs(struct host1x *host)
{
unsigned int i;
@@ -90,45 +76,38 @@ static void intr_hw_init(struct host1x *host, u32 cpm)
}
static int
-_host1x_intr_init_host_sync(struct host1x *host, u32 cpm,
- void (*syncpt_thresh_work)(struct work_struct *))
+host1x_intr_init_host_sync(struct host1x *host, u32 cpm)
{
- unsigned int i;
int err;
host1x_hw_intr_disable_all_syncpt_intrs(host);
- for (i = 0; i < host->info->nb_pts; i++)
- INIT_WORK(&host->syncpt[i].intr.work, syncpt_thresh_work);
-
- err = devm_request_irq(host->dev, host->intr_syncpt_irq,
+ err = devm_request_irq(host->dev, host->syncpt_irq,
syncpt_thresh_isr, IRQF_SHARED,
"host1x_syncpt", host);
- if (err < 0) {
- WARN_ON(1);
+ if (err < 0)
return err;
- }
intr_hw_init(host, cpm);
return 0;
}
-static void _host1x_intr_set_syncpt_threshold(struct host1x *host,
+static void host1x_intr_set_syncpt_threshold(struct host1x *host,
unsigned int id,
u32 thresh)
{
host1x_sync_writel(host, thresh, HOST1X_SYNC_SYNCPT_INT_THRESH(id));
}
-static void _host1x_intr_enable_syncpt_intr(struct host1x *host,
+static void host1x_intr_enable_syncpt_intr(struct host1x *host,
unsigned int id)
{
host1x_sync_writel(host, BIT(id % 32),
HOST1X_SYNC_SYNCPT_THRESH_INT_ENABLE_CPU0(id / 32));
}
-static void _host1x_intr_disable_syncpt_intr(struct host1x *host,
+static void host1x_intr_disable_syncpt_intr(struct host1x *host,
unsigned int id)
{
host1x_sync_writel(host, BIT(id % 32),
@@ -137,23 +116,10 @@ static void _host1x_intr_disable_syncpt_intr(struct host1x *host,
HOST1X_SYNC_SYNCPT_THRESH_CPU0_INT_STATUS(id / 32));
}
-static int _host1x_free_syncpt_irq(struct host1x *host)
-{
- unsigned int i;
-
- devm_free_irq(host->dev, host->intr_syncpt_irq, host);
-
- for (i = 0; i < host->info->nb_pts; i++)
- cancel_work_sync(&host->syncpt[i].intr.work);
-
- return 0;
-}
-
static const struct host1x_intr_ops host1x_intr_ops = {
- .init_host_sync = _host1x_intr_init_host_sync,
- .set_syncpt_threshold = _host1x_intr_set_syncpt_threshold,
- .enable_syncpt_intr = _host1x_intr_enable_syncpt_intr,
- .disable_syncpt_intr = _host1x_intr_disable_syncpt_intr,
- .disable_all_syncpt_intrs = _host1x_intr_disable_all_syncpt_intrs,
- .free_syncpt_irq = _host1x_free_syncpt_irq,
+ .init_host_sync = host1x_intr_init_host_sync,
+ .set_syncpt_threshold = host1x_intr_set_syncpt_threshold,
+ .enable_syncpt_intr = host1x_intr_enable_syncpt_intr,
+ .disable_syncpt_intr = host1x_intr_disable_syncpt_intr,
+ .disable_all_syncpt_intrs = host1x_intr_disable_all_syncpt_intrs,
};
diff --git a/drivers/gpu/host1x/intr.c b/drivers/gpu/host1x/intr.c
index 965ba21818b1..995bfa980837 100644
--- a/drivers/gpu/host1x/intr.c
+++ b/drivers/gpu/host1x/intr.c
@@ -2,299 +2,113 @@
/*
* Tegra host1x Interrupt Management
*
- * Copyright (c) 2010-2013, NVIDIA Corporation.
+ * Copyright (c) 2010-2021, NVIDIA Corporation.
*/
#include <linux/clk.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/irq.h>
-#include <trace/events/host1x.h>
-#include "channel.h"
#include "dev.h"
#include "fence.h"
#include "intr.h"
-/* Wait list management */
-
-enum waitlist_state {
- WLS_PENDING,
- WLS_REMOVED,
- WLS_CANCELLED,
- WLS_HANDLED
-};
-
-static void waiter_release(struct kref *kref)
-{
- kfree(container_of(kref, struct host1x_waitlist, refcount));
-}
-
-/*
- * add a waiter to a waiter queue, sorted by threshold
- * returns true if it was added at the head of the queue
- */
-static bool add_waiter_to_queue(struct host1x_waitlist *waiter,
- struct list_head *queue)
-{
- struct host1x_waitlist *pos;
- u32 thresh = waiter->thresh;
-
- list_for_each_entry_reverse(pos, queue, list)
- if ((s32)(pos->thresh - thresh) <= 0) {
- list_add(&waiter->list, &pos->list);
- return false;
- }
-
- list_add(&waiter->list, queue);
- return true;
-}
-
-/*
- * run through a waiter queue for a single sync point ID
- * and gather all completed waiters into lists by actions
- */
-static void remove_completed_waiters(struct list_head *head, u32 sync,
- struct list_head completed[HOST1X_INTR_ACTION_COUNT])
+static void host1x_intr_add_fence_to_list(struct host1x_fence_list *list,
+ struct host1x_syncpt_fence *fence)
{
- struct list_head *dest;
- struct host1x_waitlist *waiter, *next, *prev;
-
- list_for_each_entry_safe(waiter, next, head, list) {
- if ((s32)(waiter->thresh - sync) > 0)
- break;
+ struct host1x_syncpt_fence *fence_in_list;
- dest = completed + waiter->action;
-
- /* consolidate submit cleanups */
- if (waiter->action == HOST1X_INTR_ACTION_SUBMIT_COMPLETE &&
- !list_empty(dest)) {
- prev = list_entry(dest->prev,
- struct host1x_waitlist, list);
- if (prev->data == waiter->data) {
- prev->count++;
- dest = NULL;
- }
+ list_for_each_entry_reverse(fence_in_list, &list->list, list) {
+ if ((s32)(fence_in_list->threshold - fence->threshold) <= 0) {
+ /* Fence in list is before us, we can insert here */
+ list_add(&fence->list, &fence_in_list->list);
+ return;
}
-
- /* PENDING->REMOVED or CANCELLED->HANDLED */
- if (atomic_inc_return(&waiter->state) == WLS_HANDLED || !dest) {
- list_del(&waiter->list);
- kref_put(&waiter->refcount, waiter_release);
- } else
- list_move_tail(&waiter->list, dest);
}
-}
-
-static void reset_threshold_interrupt(struct host1x *host,
- struct list_head *head,
- unsigned int id)
-{
- u32 thresh =
- list_first_entry(head, struct host1x_waitlist, list)->thresh;
-
- host1x_hw_intr_set_syncpt_threshold(host, id, thresh);
- host1x_hw_intr_enable_syncpt_intr(host, id);
-}
-
-static void action_submit_complete(struct host1x_waitlist *waiter)
-{
- struct host1x_channel *channel = waiter->data;
-
- host1x_cdma_update(&channel->cdma);
-
- /* Add nr_completed to trace */
- trace_host1x_channel_submit_complete(dev_name(channel->dev),
- waiter->count, waiter->thresh);
-}
-static void action_wakeup(struct host1x_waitlist *waiter)
-{
- wait_queue_head_t *wq = waiter->data;
-
- wake_up(wq);
-}
-
-static void action_wakeup_interruptible(struct host1x_waitlist *waiter)
-{
- wait_queue_head_t *wq = waiter->data;
-
- wake_up_interruptible(wq);
+ /* Add as first in list */
+ list_add(&fence->list, &list->list);
}
-static void action_signal_fence(struct host1x_waitlist *waiter)
+static void host1x_intr_update_hw_state(struct host1x *host, struct host1x_syncpt *sp)
{
- struct host1x_syncpt_fence *f = waiter->data;
-
- host1x_fence_signal(f);
-}
+ struct host1x_syncpt_fence *fence;
-typedef void (*action_handler)(struct host1x_waitlist *waiter);
+ if (!list_empty(&sp->fences.list)) {
+ fence = list_first_entry(&sp->fences.list, struct host1x_syncpt_fence, list);
-static const action_handler action_handlers[HOST1X_INTR_ACTION_COUNT] = {
- action_submit_complete,
- action_wakeup,
- action_wakeup_interruptible,
- action_signal_fence,
-};
-
-static void run_handlers(struct list_head completed[HOST1X_INTR_ACTION_COUNT])
-{
- struct list_head *head = completed;
- unsigned int i;
-
- for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i, ++head) {
- action_handler handler = action_handlers[i];
- struct host1x_waitlist *waiter, *next;
-
- list_for_each_entry_safe(waiter, next, head, list) {
- list_del(&waiter->list);
- handler(waiter);
- WARN_ON(atomic_xchg(&waiter->state, WLS_HANDLED) !=
- WLS_REMOVED);
- kref_put(&waiter->refcount, waiter_release);
- }
+ host1x_hw_intr_set_syncpt_threshold(host, sp->id, fence->threshold);
+ host1x_hw_intr_enable_syncpt_intr(host, sp->id);
+ } else {
+ host1x_hw_intr_disable_syncpt_intr(host, sp->id);
}
}
-/*
- * Remove & handle all waiters that have completed for the given syncpt
- */
-static int process_wait_list(struct host1x *host,
- struct host1x_syncpt *syncpt,
- u32 threshold)
+void host1x_intr_add_fence_locked(struct host1x *host, struct host1x_syncpt_fence *fence)
{
- struct list_head completed[HOST1X_INTR_ACTION_COUNT];
- unsigned int i;
- int empty;
-
- for (i = 0; i < HOST1X_INTR_ACTION_COUNT; ++i)
- INIT_LIST_HEAD(completed + i);
-
- spin_lock(&syncpt->intr.lock);
-
- remove_completed_waiters(&syncpt->intr.wait_head, threshold,
- completed);
-
- empty = list_empty(&syncpt->intr.wait_head);
- if (empty)
- host1x_hw_intr_disable_syncpt_intr(host, syncpt->id);
- else
- reset_threshold_interrupt(host, &syncpt->intr.wait_head,
- syncpt->id);
-
- spin_unlock(&syncpt->intr.lock);
-
- run_handlers(completed);
-
- return empty;
-}
+ struct host1x_fence_list *fence_list = &fence->sp->fences;
-/*
- * Sync point threshold interrupt service thread function
- * Handles sync point threshold triggers, in thread context
- */
+ INIT_LIST_HEAD(&fence->list);
-static void syncpt_thresh_work(struct work_struct *work)
-{
- struct host1x_syncpt_intr *syncpt_intr =
- container_of(work, struct host1x_syncpt_intr, work);
- struct host1x_syncpt *syncpt =
- container_of(syncpt_intr, struct host1x_syncpt, intr);
- unsigned int id = syncpt->id;
- struct host1x *host = syncpt->host;
-
- (void)process_wait_list(host, syncpt,
- host1x_syncpt_load(host->syncpt + id));
+ host1x_intr_add_fence_to_list(fence_list, fence);
+ host1x_intr_update_hw_state(host, fence->sp);
}
-int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
- u32 thresh, enum host1x_intr_action action,
- void *data, struct host1x_waitlist *waiter,
- void **ref)
+bool host1x_intr_remove_fence(struct host1x *host, struct host1x_syncpt_fence *fence)
{
- int queue_was_empty;
-
- if (waiter == NULL) {
- pr_warn("%s: NULL waiter\n", __func__);
- return -EINVAL;
- }
-
- /* initialize a new waiter */
- INIT_LIST_HEAD(&waiter->list);
- kref_init(&waiter->refcount);
- if (ref)
- kref_get(&waiter->refcount);
- waiter->thresh = thresh;
- waiter->action = action;
- atomic_set(&waiter->state, WLS_PENDING);
- waiter->data = data;
- waiter->count = 1;
-
- spin_lock(&syncpt->intr.lock);
+ struct host1x_fence_list *fence_list = &fence->sp->fences;
+ unsigned long irqflags;
- queue_was_empty = list_empty(&syncpt->intr.wait_head);
+ spin_lock_irqsave(&fence_list->lock, irqflags);
- if (add_waiter_to_queue(waiter, &syncpt->intr.wait_head)) {
- /* added at head of list - new threshold value */
- host1x_hw_intr_set_syncpt_threshold(host, syncpt->id, thresh);
-
- /* added as first waiter - enable interrupt */
- if (queue_was_empty)
- host1x_hw_intr_enable_syncpt_intr(host, syncpt->id);
+ if (list_empty(&fence->list)) {
+ spin_unlock_irqrestore(&fence_list->lock, irqflags);
+ return false;
}
- if (ref)
- *ref = waiter;
+ list_del_init(&fence->list);
+ host1x_intr_update_hw_state(host, fence->sp);
- spin_unlock(&syncpt->intr.lock);
+ spin_unlock_irqrestore(&fence_list->lock, irqflags);
- return 0;
+ return true;
}
-void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref,
- bool flush)
+void host1x_intr_handle_interrupt(struct host1x *host, unsigned int id)
{
- struct host1x_waitlist *waiter = ref;
- struct host1x_syncpt *syncpt;
+ struct host1x_syncpt *sp = &host->syncpt[id];
+ struct host1x_syncpt_fence *fence, *tmp;
+ unsigned int value;
- atomic_cmpxchg(&waiter->state, WLS_PENDING, WLS_CANCELLED);
+ value = host1x_syncpt_load(sp);
- syncpt = host->syncpt + id;
+ spin_lock(&sp->fences.lock);
- spin_lock(&syncpt->intr.lock);
- if (atomic_cmpxchg(&waiter->state, WLS_CANCELLED, WLS_HANDLED) ==
- WLS_CANCELLED) {
- list_del(&waiter->list);
- kref_put(&waiter->refcount, waiter_release);
- }
- spin_unlock(&syncpt->intr.lock);
+ list_for_each_entry_safe(fence, tmp, &sp->fences.list, list) {
+ if (((value - fence->threshold) & 0x80000000U) != 0U) {
+ /* Fence is not yet expired, we are done */
+ break;
+ }
- if (flush) {
- /* Wait until any concurrently executing handler has finished. */
- while (atomic_read(&waiter->state) != WLS_HANDLED)
- schedule();
+ list_del_init(&fence->list);
+ host1x_fence_signal(fence);
}
- kref_put(&waiter->refcount, waiter_release);
+ /* Re-enable interrupt if necessary */
+ host1x_intr_update_hw_state(host, sp);
+
+ spin_unlock(&sp->fences.lock);
}
-int host1x_intr_init(struct host1x *host, unsigned int irq_sync)
+int host1x_intr_init(struct host1x *host)
{
unsigned int id;
- u32 nb_pts = host1x_syncpt_nb_pts(host);
mutex_init(&host->intr_mutex);
- host->intr_syncpt_irq = irq_sync;
- for (id = 0; id < nb_pts; ++id) {
- struct host1x_syncpt *syncpt = host->syncpt + id;
+ for (id = 0; id < host1x_syncpt_nb_pts(host); ++id) {
+ struct host1x_syncpt *syncpt = &host->syncpt[id];
- spin_lock_init(&syncpt->intr.lock);
- INIT_LIST_HEAD(&syncpt->intr.wait_head);
- snprintf(syncpt->intr.thresh_irq_name,
- sizeof(syncpt->intr.thresh_irq_name),
- "host1x_sp_%02u", id);
+ spin_lock_init(&syncpt->fences.lock);
+ INIT_LIST_HEAD(&syncpt->fences.list);
}
return 0;
@@ -310,8 +124,7 @@ void host1x_intr_start(struct host1x *host)
int err;
mutex_lock(&host->intr_mutex);
- err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000),
- syncpt_thresh_work);
+ err = host1x_hw_intr_init_host_sync(host, DIV_ROUND_UP(hz, 1000000));
if (err) {
mutex_unlock(&host->intr_mutex);
return;
@@ -321,36 +134,5 @@ void host1x_intr_start(struct host1x *host)
void host1x_intr_stop(struct host1x *host)
{
- unsigned int id;
- struct host1x_syncpt *syncpt = host->syncpt;
- u32 nb_pts = host1x_syncpt_nb_pts(host);
-
- mutex_lock(&host->intr_mutex);
-
host1x_hw_intr_disable_all_syncpt_intrs(host);
-
- for (id = 0; id < nb_pts; ++id) {
- struct host1x_waitlist *waiter, *next;
-
- list_for_each_entry_safe(waiter, next,
- &syncpt[id].intr.wait_head, list) {
- if (atomic_cmpxchg(&waiter->state,
- WLS_CANCELLED, WLS_HANDLED) == WLS_CANCELLED) {
- list_del(&waiter->list);
- kref_put(&waiter->refcount, waiter_release);
- }
- }
-
- if (!list_empty(&syncpt[id].intr.wait_head)) {
- /* output diagnostics */
- mutex_unlock(&host->intr_mutex);
- pr_warn("%s cannot stop syncpt intr id=%u\n",
- __func__, id);
- return;
- }
- }
-
- host1x_hw_intr_free_syncpt_irq(host);
-
- mutex_unlock(&host->intr_mutex);
}
diff --git a/drivers/gpu/host1x/intr.h b/drivers/gpu/host1x/intr.h
index e4c346099273..3b5610b525e5 100644
--- a/drivers/gpu/host1x/intr.h
+++ b/drivers/gpu/host1x/intr.h
@@ -2,87 +2,17 @@
/*
* Tegra host1x Interrupt Management
*
- * Copyright (c) 2010-2013, NVIDIA Corporation.
+ * Copyright (c) 2010-2021, NVIDIA Corporation.
*/
#ifndef __HOST1X_INTR_H
#define __HOST1X_INTR_H
-#include <linux/interrupt.h>
-#include <linux/workqueue.h>
-
-struct host1x_syncpt;
struct host1x;
-
-enum host1x_intr_action {
- /*
- * Perform cleanup after a submit has completed.
- * 'data' points to a channel
- */
- HOST1X_INTR_ACTION_SUBMIT_COMPLETE = 0,
-
- /*
- * Wake up a task.
- * 'data' points to a wait_queue_head_t
- */
- HOST1X_INTR_ACTION_WAKEUP,
-
- /*
- * Wake up a interruptible task.
- * 'data' points to a wait_queue_head_t
- */
- HOST1X_INTR_ACTION_WAKEUP_INTERRUPTIBLE,
-
- HOST1X_INTR_ACTION_SIGNAL_FENCE,
-
- HOST1X_INTR_ACTION_COUNT
-};
-
-struct host1x_syncpt_intr {
- spinlock_t lock;
- struct list_head wait_head;
- char thresh_irq_name[12];
- struct work_struct work;
-};
-
-struct host1x_waitlist {
- struct list_head list;
- struct kref refcount;
- u32 thresh;
- enum host1x_intr_action action;
- atomic_t state;
- void *data;
- int count;
-};
-
-/*
- * Schedule an action to be taken when a sync point reaches the given threshold.
- *
- * @id the sync point
- * @thresh the threshold
- * @action the action to take
- * @data a pointer to extra data depending on action, see above
- * @waiter waiter structure - assumes ownership
- * @ref must be passed if cancellation is possible, else NULL
- *
- * This is a non-blocking api.
- */
-int host1x_intr_add_action(struct host1x *host, struct host1x_syncpt *syncpt,
- u32 thresh, enum host1x_intr_action action,
- void *data, struct host1x_waitlist *waiter,
- void **ref);
-
-/*
- * Unreference an action submitted to host1x_intr_add_action().
- * You must call this if you passed non-NULL as ref.
- * @ref the ref returned from host1x_intr_add_action()
- * @flush wait until any pending handlers have completed before returning.
- */
-void host1x_intr_put_ref(struct host1x *host, unsigned int id, void *ref,
- bool flush);
+struct host1x_syncpt_fence;
/* Initialize host1x sync point interrupt */
-int host1x_intr_init(struct host1x *host, unsigned int irq_sync);
+int host1x_intr_init(struct host1x *host);
/* Deinitialize host1x sync point interrupt */
void host1x_intr_deinit(struct host1x *host);
@@ -93,5 +23,10 @@ void host1x_intr_start(struct host1x *host);
/* Disable host1x sync point interrupt */
void host1x_intr_stop(struct host1x *host);
-irqreturn_t host1x_syncpt_thresh_fn(void *dev_id);
+void host1x_intr_handle_interrupt(struct host1x *host, unsigned int id);
+
+void host1x_intr_add_fence_locked(struct host1x *host, struct host1x_syncpt_fence *fence);
+
+bool host1x_intr_remove_fence(struct host1x *host, struct host1x_syncpt_fence *fence);
+
#endif
diff --git a/drivers/gpu/host1x/syncpt.h b/drivers/gpu/host1x/syncpt.h
index 95cd29b79d6d..4c3f3b2f0e9c 100644
--- a/drivers/gpu/host1x/syncpt.h
+++ b/drivers/gpu/host1x/syncpt.h
@@ -14,6 +14,7 @@
#include <linux/kref.h>
#include <linux/sched.h>
+#include "fence.h"
#include "intr.h"
struct host1x;
@@ -39,7 +40,7 @@ struct host1x_syncpt {
struct host1x_syncpt_base *base;
/* interrupt data */
- struct host1x_syncpt_intr intr;
+ struct host1x_fence_list fences;
/*
* If a submission incrementing this syncpoint fails, lock it so that
--
2.39.0