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drm/amdgpu/gfx10: fix race condition for kiq

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[ Upstream commit 7d65a577bb58d4f27a3398a4c0cb0b00ab7d0511 ]

During preemption test for gfx10, it uses kiq to trigger
gfx preemption, which would result in race condition
with flushing TLB for kiq.

Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jack Xiao 2020-07-10 12:18:22 +08:00 • committed by Greg Kroah-Hartman
commit ffb5604d20
1 changed files with 8 additions and 1 deletions
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9
drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
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@ -4683,12 +4683,17 @@ static int gfx_v10_0_ring_preempt_ib(struct amdgpu_ring *ring)
struct amdgpu_device *adev = ring->adev;
struct amdgpu_kiq *kiq = &adev->gfx.kiq;
struct amdgpu_ring *kiq_ring = &kiq->ring;
unsigned long flags;
if (!kiq->pmf || !kiq->pmf->kiq_unmap_queues)
return -EINVAL;
if (amdgpu_ring_alloc(kiq_ring, kiq->pmf->unmap_queues_size))
spin_lock_irqsave(&kiq->ring_lock, flags);
if (amdgpu_ring_alloc(kiq_ring, kiq->pmf->unmap_queues_size)) {
spin_unlock_irqrestore(&kiq->ring_lock, flags);
return -ENOMEM;
}
/* assert preemption condition */
amdgpu_ring_set_preempt_cond_exec(ring, false);
@ -4699,6 +4704,8 @@ static int gfx_v10_0_ring_preempt_ib(struct amdgpu_ring *ring)
++ring->trail_seq);
amdgpu_ring_commit(kiq_ring);
spin_unlock_irqrestore(&kiq->ring_lock, flags);
/* poll the trailing fence */
for (i = 0; i < adev->usec_timeout; i++) {
if (ring->trail_seq ==