[PATCH 13/20] drm/radeon: use one wait queue for all rings add fence_wait_any v2
Christian König
deathsimple at vodafone.de
Mon May 7 04:42:48 PDT 2012
From: Jerome Glisse <jglisse at redhat.com>
Use one wait queue for all rings. When one ring progress, other
likely does to and we are not expecting to have a lot of waiter
anyway.
Also add a fence_wait_any that will wait until the first fence
in the fence array (one fence per ring) is signaled. This allow
to wait on all rings.
v2: some minor cleanups and improvements.
Signed-off-by: Christian König <deathsimple at vodafone.de>
Signed-off-by: Jerome Glisse <jglisse at redhat.com>
---
drivers/gpu/drm/radeon/radeon.h | 5 +-
drivers/gpu/drm/radeon/radeon_fence.c | 163 ++++++++++++++++++++++++++++++++-
2 files changed, 162 insertions(+), 6 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index ada70d1..37a7459 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -262,7 +262,6 @@ struct radeon_fence_driver {
uint64_t seq;
atomic64_t last_seq;
unsigned long last_activity;
- wait_queue_head_t queue;
bool initialized;
};
@@ -286,6 +285,9 @@ bool radeon_fence_signaled(struct radeon_fence *fence);
int radeon_fence_wait(struct radeon_fence *fence, bool interruptible);
int radeon_fence_wait_next_locked(struct radeon_device *rdev, int ring);
int radeon_fence_wait_empty_locked(struct radeon_device *rdev, int ring);
+int radeon_fence_wait_any(struct radeon_device *rdev,
+ struct radeon_fence **fences,
+ bool intr);
struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence);
void radeon_fence_unref(struct radeon_fence **fence);
unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring);
@@ -1534,6 +1536,7 @@ struct radeon_device {
struct radeon_scratch scratch;
struct radeon_mman mman;
struct radeon_fence_driver fence_drv[RADEON_NUM_RINGS];
+ wait_queue_head_t fence_queue;
struct radeon_semaphore_driver semaphore_drv;
struct mutex ring_lock;
struct radeon_ring ring[RADEON_NUM_RINGS];
diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
index 8034b42..45d4e6e 100644
--- a/drivers/gpu/drm/radeon/radeon_fence.c
+++ b/drivers/gpu/drm/radeon/radeon_fence.c
@@ -222,11 +222,11 @@ static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 target_seq,
trace_radeon_fence_wait_begin(rdev->ddev, seq);
radeon_irq_kms_sw_irq_get(rdev, ring);
if (intr) {
- r = wait_event_interruptible_timeout(rdev->fence_drv[ring].queue,
+ r = wait_event_interruptible_timeout(rdev->fence_queue,
(signaled = radeon_fence_seq_signaled(rdev, target_seq, ring)),
timeout);
} else {
- r = wait_event_timeout(rdev->fence_drv[ring].queue,
+ r = wait_event_timeout(rdev->fence_queue,
(signaled = radeon_fence_seq_signaled(rdev, target_seq, ring)),
timeout);
}
@@ -300,6 +300,159 @@ int radeon_fence_wait(struct radeon_fence *fence, bool intr)
return 0;
}
+bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq)
+{
+ unsigned i;
+
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ if (seq[i] && radeon_fence_seq_signaled(rdev, seq[i], i)) {
+ return true;
+ }
+ }
+ return false;
+}
+
+static int radeon_fence_wait_any_seq(struct radeon_device *rdev,
+ u64 *target_seq, bool intr)
+{
+ unsigned long timeout, last_activity, tmp;
+ unsigned i, ring = RADEON_NUM_RINGS;
+ bool signaled;
+ int r;
+
+ for (i = 0, last_activity = 0; i < RADEON_NUM_RINGS; ++i) {
+ if (!target_seq[i]) {
+ continue;
+ }
+
+ /* use the most recent one as indicator */
+ if (time_after(rdev->fence_drv[i].last_activity, last_activity)) {
+ last_activity = rdev->fence_drv[i].last_activity;
+ }
+
+ /* For lockup detection just pick the lowest ring we are
+ * actively waiting for
+ */
+ if (i < ring) {
+ ring = i;
+ }
+ }
+
+ /* nothing to wait for ? */
+ if (ring == RADEON_NUM_RINGS) {
+ return 0;
+ }
+
+ while (!radeon_fence_any_seq_signaled(rdev, target_seq)) {
+ timeout = jiffies - RADEON_FENCE_JIFFIES_TIMEOUT;
+ if (time_after(last_activity, timeout)) {
+ /* the normal case, timeout is somewhere before last_activity */
+ timeout = last_activity - timeout;
+ } else {
+ /* either jiffies wrapped around, or no fence was signaled in the last 500ms
+ * anyway we will just wait for the minimum amount and then check for a lockup
+ */
+ timeout = 1;
+ }
+
+ trace_radeon_fence_wait_begin(rdev->ddev, target_seq[ring]);
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ if (target_seq[i]) {
+ radeon_irq_kms_sw_irq_get(rdev, i);
+ }
+ }
+ if (intr) {
+ r = wait_event_interruptible_timeout(rdev->fence_queue,
+ (signaled = radeon_fence_any_seq_signaled(rdev, target_seq)),
+ timeout);
+ } else {
+ r = wait_event_timeout(rdev->fence_queue,
+ (signaled = radeon_fence_any_seq_signaled(rdev, target_seq)),
+ timeout);
+ }
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ if (target_seq[i]) {
+ radeon_irq_kms_sw_irq_put(rdev, i);
+ }
+ }
+ if (unlikely(r < 0)) {
+ return r;
+ }
+ trace_radeon_fence_wait_end(rdev->ddev, target_seq[ring]);
+
+ if (unlikely(!signaled)) {
+ /* we were interrupted for some reason and fence
+ * isn't signaled yet, resume waiting */
+ if (r) {
+ continue;
+ }
+
+ mutex_lock(&rdev->ring_lock);
+ for (i = 0, tmp = 0; i < RADEON_NUM_RINGS; ++i) {
+ if (time_after(rdev->fence_drv[i].last_activity, tmp)) {
+ tmp = rdev->fence_drv[i].last_activity;
+ }
+ }
+ /* test if somebody else has already decided that this is a lockup */
+ if (last_activity != tmp) {
+ last_activity = tmp;
+ mutex_unlock(&rdev->ring_lock);
+ continue;
+ }
+
+ if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) {
+ /* good news we believe it's a lockup */
+ dev_warn(rdev->dev, "GPU lockup (waiting for 0x%016llx)\n",
+ target_seq[ring]);
+
+ /* change last activity so nobody else think there is a lockup */
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ rdev->fence_drv[i].last_activity = jiffies;
+ }
+
+ /* mark the ring as not ready any more */
+ rdev->ring[ring].ready = false;
+ mutex_unlock(&rdev->ring_lock);
+ return -EDEADLK;
+ }
+ mutex_unlock(&rdev->ring_lock);
+ }
+ }
+ return 0;
+}
+
+int radeon_fence_wait_any(struct radeon_device *rdev,
+ struct radeon_fence **fences,
+ bool intr)
+{
+ uint64_t seq[RADEON_NUM_RINGS];
+ unsigned i;
+ int r;
+
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ seq[i] = 0;
+
+ if (!fences[i]) {
+ continue;
+ }
+
+ if (fences[i]->seq == RADEON_FENCE_SIGNALED_SEQ) {
+ /* something was allready signaled */
+ return 0;
+ }
+
+ if (fences[i]->seq < RADEON_FENCE_NOTEMITED_SEQ) {
+ seq[i] = fences[i]->seq;
+ }
+ }
+
+ r = radeon_fence_wait_any_seq(rdev, seq, intr);
+ if (r) {
+ return r;
+ }
+ return 0;
+}
+
int radeon_fence_wait_next_locked(struct radeon_device *rdev, int ring)
{
uint64_t seq;
@@ -350,7 +503,7 @@ void radeon_fence_process(struct radeon_device *rdev, int ring)
wake = radeon_fence_poll(rdev, ring);
if (wake) {
- wake_up_all(&rdev->fence_drv[ring].queue);
+ wake_up_all(&rdev->fence_queue);
}
}
@@ -406,7 +559,6 @@ static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring)
rdev->fence_drv[ring].seq = 0;
atomic64_set(&rdev->fence_drv[ring].last_seq, 0);
rdev->fence_drv[ring].last_activity = jiffies;
- init_waitqueue_head(&rdev->fence_drv[ring].queue);
rdev->fence_drv[ring].initialized = false;
}
@@ -414,6 +566,7 @@ int radeon_fence_driver_init(struct radeon_device *rdev)
{
int ring;
+ init_waitqueue_head(&rdev->fence_queue);
for (ring = 0; ring < RADEON_NUM_RINGS; ring++) {
radeon_fence_driver_init_ring(rdev, ring);
}
@@ -432,7 +585,7 @@ void radeon_fence_driver_fini(struct radeon_device *rdev)
if (!rdev->fence_drv[ring].initialized)
continue;
radeon_fence_wait_empty_locked(rdev, ring);
- wake_up_all(&rdev->fence_drv[ring].queue);
+ wake_up_all(&rdev->fence_queue);
radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg);
rdev->fence_drv[ring].initialized = false;
}
--
1.7.5.4
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