On Thu, Sep 13, 2012 at 9:54 AM, Alex Deucher alexdeucher@gmail.com wrote:
On Thu, Sep 13, 2012 at 4:33 AM, Christian König deathsimple@vodafone.de wrote:
Only increase the higher 32bits if we really detect a wrap around.
v2: instead of increasing the higher 32bits just use the higher 32bits from the last emitted fence. v3: also use last emitted fence value as upper limit.
The intention of this patch is to make fences as robust as they where before introducing 64bit fences. This is necessary because on older systems it looks like the fence value gets corrupted on initialization.
Should fix: https://bugs.freedesktop.org/show_bug.cgi?id=54129 https://bugs.freedesktop.org/show_bug.cgi?id=51344 https://bugs.freedesktop.org/show_bug.cgi?id=54662 https://bugzilla.redhat.com/show_bug.cgi?id=846505 https://bugzilla.redhat.com/show_bug.cgi?id=845639
Needs to be adopted for 3.5, but that shouldn't be to much of a problem.
Signed-off-by: Christian König deathsimple@vodafone.de Cc: stable@vger.kernel.org
This looks good to me. I made a few minor changes to the commit message to note that 3.5.x requires a different patch which will be sent out separately due to changes in the fence code. If there are no objections I'll send this out in my next -fixes pull request later today.
Yeah looks good here too
Cheers, Jerome
Alex
drivers/gpu/drm/radeon/radeon_fence.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c index 7b737b9..2a59375 100644 --- a/drivers/gpu/drm/radeon/radeon_fence.c +++ b/drivers/gpu/drm/radeon/radeon_fence.c @@ -131,7 +131,7 @@ int radeon_fence_emit(struct radeon_device *rdev, */ void radeon_fence_process(struct radeon_device *rdev, int ring) {
uint64_t seq, last_seq;
uint64_t seq, last_seq, last_emitted; unsigned count_loop = 0; bool wake = false;@@ -158,13 +158,15 @@ void radeon_fence_process(struct radeon_device *rdev, int ring) */ last_seq = atomic64_read(&rdev->fence_drv[ring].last_seq); do {
last_emitted = rdev->fence_drv[ring].sync_seq[ring]; seq = radeon_fence_read(rdev, ring); seq |= last_seq & 0xffffffff00000000LL; if (seq < last_seq) {
seq += 0x100000000LL;
seq &= 0xffffffff;seq |= last_emitted & 0xffffffff00000000LL; }
if (seq == last_seq) {
if (seq <= last_seq || seq > last_emitted) { break; } /* If we loop over we don't want to return without-- 1.7.9.5
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