[RFC PATCH v1.4 08/16 1/2] drm/radeon: add timeout argument to radeon_fence_wait_seq

Maarten Lankhorst
2014-06-03T07:50:20Z

This makes it possible to wait for a specific amount of time,
rather than wait until infinity.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Christian König <deathsimple@vodafone.de>
---
drivers/gpu/drm/radeon/radeon_fence.c | 60 +++++++++++++++++++++++------------
1 file changed, 40 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c
index a77b1c13ea43..b25b14231421 100644
--- a/drivers/gpu/drm/radeon/radeon_fence.c
+++ b/drivers/gpu/drm/radeon/radeon_fence.c
@@ -283,28 +283,35 @@ static bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq)
}

/**
- * radeon_fence_wait_seq - wait for a specific sequence numbers
+ * radeon_fence_wait_seq_timeout - wait for a specific sequence numbers
*
* @rdev: radeon device pointer
* @target_seq: sequence number(s) we want to wait for
* @intr: use interruptable sleep
+ * @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait
*
* Wait for the requested sequence number(s) to be written by any ring
* (all asics). Sequnce number array is indexed by ring id.
* @intr selects whether to use interruptable (true) or non-interruptable
* (false) sleep when waiting for the sequence number. Helper function
* for radeon_fence_wait_*().
- * Returns 0 if the sequence number has passed, error for all other cases.
+ * Returns remaining time if the sequence number has passed, 0 when
+ * the wait timeout, or an error for all other cases.
* -EDEADLK is returned when a GPU lockup has been detected.
*/
-static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 *target_seq,
- bool intr)
+static int radeon_fence_wait_seq_timeout(struct radeon_device *rdev,
+ u64 *target_seq, bool intr,
+ long timeout)
{
uint64_t last_seq[RADEON_NUM_RINGS];
bool signaled;
- int i, r;
+ int i;

while (!radeon_fence_any_seq_signaled(rdev, target_seq)) {
+ long r, waited;
+
+ waited = timeout < RADEON_FENCE_JIFFIES_TIMEOUT ?
+ timeout : RADEON_FENCE_JIFFIES_TIMEOUT;

/* Save current sequence values, used to check for GPU lockups */
for (i = 0; i < RADEON_NUM_RINGS; ++i) {
@@ -319,11 +326,11 @@ static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 *target_seq,
if (intr) {
r = wait_event_interruptible_timeout(rdev->fence_queue, (
(signaled = radeon_fence_any_seq_signaled(rdev, target_seq))
- || rdev->needs_reset), RADEON_FENCE_JIFFIES_TIMEOUT);
+ || rdev->needs_reset), waited);
} else {
r = wait_event_timeout(rdev->fence_queue, (
(signaled = radeon_fence_any_seq_signaled(rdev, target_seq))
- || rdev->needs_reset), RADEON_FENCE_JIFFIES_TIMEOUT);
+ || rdev->needs_reset), waited);
}

for (i = 0; i < RADEON_NUM_RINGS; ++i) {
@@ -337,6 +344,14 @@ static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 *target_seq,
if (unlikely(r < 0))
return r;

+ timeout -= waited - r;
+
+ /*
+ * If this is a timed wait and the wait completely timed out just return.
+ */
+ if (!timeout)
+ break;
+
if (unlikely(!signaled)) {
if (rdev->needs_reset)
return -EDEADLK;
@@ -379,14 +394,14 @@ static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 *target_seq,
}
}
}
- return 0;
+ return timeout;
}

/**
* radeon_fence_wait - wait for a fence to signal
*
* @fence: radeon fence object
- * @intr: use interruptable sleep
+ * @intr: use interruptible sleep
*
* Wait for the requested fence to signal (all asics).
* @intr selects whether to use interruptable (true) or non-interruptable
@@ -396,7 +411,7 @@ static int radeon_fence_wait_seq(struct radeon_device *rdev, u64 *target_seq,
int radeon_fence_wait(struct radeon_fence *fence, bool intr)
{
uint64_t seq[RADEON_NUM_RINGS] = {};
- int r;
+ long r;

if (fence == NULL) {
WARN(1, "Querying an invalid fence : %p !\n", fence);
@@ -407,9 +422,10 @@ int radeon_fence_wait(struct radeon_fence *fence, bool intr)
if (seq[fence->ring] == RADEON_FENCE_SIGNALED_SEQ)
return 0;

- r = radeon_fence_wait_seq(fence->rdev, seq, intr);
- if (r)
+ r = radeon_fence_wait_seq_timeout(fence->rdev, seq, intr, MAX_SCHEDULE_TIMEOUT);
+ if (r < 0) {
return r;
+ }

fence->seq = RADEON_FENCE_SIGNALED_SEQ;
return 0;
@@ -434,7 +450,7 @@ int radeon_fence_wait_any(struct radeon_device *rdev,
{
uint64_t seq[RADEON_NUM_RINGS];
unsigned i, num_rings = 0;
- int r;
+ long r;

for (i = 0; i < RADEON_NUM_RINGS; ++i) {
seq[i] = 0;
@@ -455,8 +471,8 @@ int radeon_fence_wait_any(struct radeon_device *rdev,
if (num_rings == 0)
return -ENOENT;

- r = radeon_fence_wait_seq(rdev, seq, intr);
- if (r) {
+ r = radeon_fence_wait_seq_timeout(rdev, seq, intr, MAX_SCHEDULE_TIMEOUT);
+ if (r < 0) {
return r;
}
return 0;
@@ -475,6 +491,7 @@ int radeon_fence_wait_any(struct radeon_device *rdev,
int radeon_fence_wait_next(struct radeon_device *rdev, int ring)
{
uint64_t seq[RADEON_NUM_RINGS] = {};
+ long r;

seq[ring] = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL;
if (seq[ring] >= rdev->fence_drv[ring].sync_seq[ring]) {
@@ -482,7 +499,10 @@ int radeon_fence_wait_next(struct radeon_device *rdev, int ring)
already the last emited fence */
return -ENOENT;
}
- return radeon_fence_wait_seq(rdev, seq, false);
+ r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT);
+ if (r < 0)
+ return r;
+ return 0;
}

/**
@@ -498,18 +518,18 @@ int radeon_fence_wait_next(struct radeon_device *rdev, int ring)
int radeon_fence_wait_empty(struct radeon_device *rdev, int ring)
{
uint64_t seq[RADEON_NUM_RINGS] = {};
- int r;
+ long r;

seq[ring] = rdev->fence_drv[ring].sync_seq[ring];
if (!seq[ring])
return 0;

- r = radeon_fence_wait_seq(rdev, seq, false);
- if (r) {
+ r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT);
+ if (r < 0) {
if (r == -EDEADLK)
return -EDEADLK;

- dev_err(rdev->dev, "error waiting for ring[%d] to become idle (%d)\n",
+ dev_err(rdev->dev, "error waiting for ring[%d] to become idle (%ld)\n",
ring, r);
}
return 0;
--
1.9.3