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drm/radeon: rework fence handling, drop fence list v7

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Using 64bits fence sequence we can directly compare sequence
number to know if a fence is signaled or not. Thus the fence
list became useless, so does the fence lock that mainly
protected the fence list.

Things like ring.ready are no longer behind a lock, this should
be ok as ring.ready is initialized once and will only change
when facing lockup. Worst case is that we return an -EBUSY just
after a successfull GPU reset, or we go into wait state instead
of returning -EBUSY (thus delaying reporting -EBUSY to fence
wait caller).

v2: Remove left over comment, force using writeback on cayman and
    newer, thus not having to suffer from possibly scratch reg
    exhaustion
v3: Rebase on top of change to uint64 fence patch
v4: Change DCE5 test to force write back on cayman and newer but
    also any APU such as PALM or SUMO family
v5: Rebase on top of new uint64 fence patch
v6: Just break if seq doesn't change any more. Use radeon_fence
    prefix for all function names. Even if it's now highly optimized,
    try avoiding polling to often.
v7: We should never poll the last_seq from the hardware without
    waking the sleeping threads, otherwise we might lose events.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Christian König <deathsimple@vodafone.de>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Jerome Glisse
2012-05-09 15:34:47 +02:00
committed by Dave Airlie
parent bb63556729
commit 3b7a2b24ea
3 changed files with 121 additions and 196 deletions
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8
drivers/gpu/drm/radeon/radeon_device.c
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@@ -225,9 +225,9 @@ int radeon_wb_init(struct radeon_device *rdev)
/* disable event_write fences */
rdev->wb.use_event = false;
/* disabled via module param */
if (radeon_no_wb == 1)
if (radeon_no_wb == 1) {
rdev->wb.enabled = false;
else {
} else {
if (rdev->flags & RADEON_IS_AGP) {
/* often unreliable on AGP */
rdev->wb.enabled = false;
@@ -237,8 +237,9 @@ int radeon_wb_init(struct radeon_device *rdev)
} else {
rdev->wb.enabled = true;
/* event_write fences are only available on r600+ */
if (rdev->family >= CHIP_R600)
if (rdev->family >= CHIP_R600) {
rdev->wb.use_event = true;
}
}
}
/* always use writeback/events on NI, APUs */
@@ -731,7 +732,6 @@ int radeon_device_init(struct radeon_device *rdev,
mutex_init(&rdev->gem.mutex);
mutex_init(&rdev->pm.mutex);
mutex_init(&rdev->vram_mutex);
rwlock_init(&rdev->fence_lock);
rwlock_init(&rdev->semaphore_drv.lock);
INIT_LIST_HEAD(&rdev->gem.objects);
init_waitqueue_head(&rdev->irq.vblank_queue);