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drm/amdgpu: workaround for TLB seq race 

It can happen that we query the sequence value before the callback
had a chance to run.

Workaround that by grabbing the fence lock and releasing it again.
Should be replaced by hw handling soon.

Signed-off-by: Christian König <christian.koenig@amd.com>
CC: stable@vger.kernel.org # 5.19+
Fixes: 5255e146c9 ("drm/amdgpu: rework TLB flushing")
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2113
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Philip Yang <Philip.Yang@amd.com>
Tested-by: Stefan Springer <stefanspr94@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2022-11-02 14:55:13 +01:00 committed by Alex Deucher
parent a0fba3e078
commit f9e6949645
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
View File

@ -492,6 +492,21 @@ void amdgpu_debugfs_vm_bo_info(struct amdgpu_vm *vm, struct seq_file *m);
*/
static inline uint64_t amdgpu_vm_tlb_seq(struct amdgpu_vm *vm)
{
unsigned long flags;
spinlock_t *lock;
/*
* Workaround to stop racing between the fence signaling and handling
* the cb. The lock is static after initially setting it up, just make
* sure that the dma_fence structure isn't freed up.
*/
rcu_read_lock();
lock = vm->last_tlb_flush->lock;
rcu_read_unlock();
spin_lock_irqsave(lock, flags);
spin_unlock_irqrestore(lock, flags);
return atomic64_read(&vm->tlb_seq);
}