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drm/amdgpu: reuse VMIDs already assigned to a process 

If we don't need to flush we can easily use another VMID
already assigned to the process.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2016-03-09 22:11:53 +01:00 committed by Alex Deucher
parent 41d9eb2c5a
commit 794f50b95d
1 changed files with 48 additions and 33 deletions
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81
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -166,48 +166,63 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
{
uint64_t pd_addr = amdgpu_bo_gpu_offset(vm->page_directory);
struct amdgpu_device *adev = ring->adev;
struct amdgpu_vm_id *id = vm->ids[ring->idx];
struct fence *updates = sync->last_vm_update;
struct amdgpu_vm_id *id;
unsigned i = ring->idx;
int r;
mutex_lock(&adev->vm_manager.lock);
/* check if the id is still valid */
if (id) {
struct fence *flushed = id->flushed_updates;
long owner = atomic_long_read(&id->owner);
bool usable = pd_addr == id->pd_gpu_addr;
/* Check if we can use a VMID already assigned to this VM */
do {
struct fence *flushed;
if (owner != (long)&vm->ids[ring->idx])
usable = false;
else if (!flushed)
usable = false;
else if (!updates)
usable = true;
else
usable = !fence_is_later(updates, flushed);
id = vm->ids[i++];
if (i == AMDGPU_MAX_RINGS)
i = 0;
if (usable) {
/* Check all the prerequisites to using this VMID */
if (!id)
continue;
r = amdgpu_sync_fence(ring->adev, sync, id->first);
if (atomic_long_read(&id->owner) != (long)vm)
continue;
if (pd_addr != id->pd_gpu_addr)
continue;
if (id != vm->ids[ring->idx] &&
(!id->last_flush || !fence_is_signaled(id->last_flush)))
continue;
flushed = id->flushed_updates;
if (updates && (!flushed || fence_is_later(updates, flushed)))
continue;
/* Good we can use this VMID */
if (id == vm->ids[ring->idx]) {
r = amdgpu_sync_fence(ring->adev, sync,
id->first);
if (r)
goto error;
r = amdgpu_sync_fence(ring->adev, &id->active, fence);
if (r)
goto error;
list_move_tail(&id->list, &adev->vm_manager.ids_lru);
*vm_id = id - adev->vm_manager.ids;
*vm_pd_addr = AMDGPU_VM_NO_FLUSH;
trace_amdgpu_vm_grab_id(vm, ring->idx, *vm_id,
*vm_pd_addr);
mutex_unlock(&adev->vm_manager.lock);
return 0;
}
}
/* And remember this submission as user of the VMID */
r = amdgpu_sync_fence(ring->adev, &id->active, fence);
if (r)
goto error;
list_move_tail(&id->list, &adev->vm_manager.ids_lru);
vm->ids[ring->idx] = id;
*vm_id = id - adev->vm_manager.ids;
*vm_pd_addr = AMDGPU_VM_NO_FLUSH;
trace_amdgpu_vm_grab_id(vm, ring->idx, *vm_id, *vm_pd_addr);
mutex_unlock(&adev->vm_manager.lock);
return 0;
} while (i != ring->idx);
id = list_first_entry(&adev->vm_manager.ids_lru,
struct amdgpu_vm_id,
@ -245,7 +260,7 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
id->pd_gpu_addr = pd_addr;
list_move_tail(&id->list, &adev->vm_manager.ids_lru);
atomic_long_set(&id->owner, (long)id);
atomic_long_set(&id->owner, (long)vm);
vm->ids[ring->idx] = id;
*vm_id = id - adev->vm_manager.ids;
@ -1464,7 +1479,7 @@ void amdgpu_vm_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm)
if (!id)
continue;
atomic_long_cmpxchg(&id->owner, (long)&vm->ids[i], 0);
atomic_long_cmpxchg(&id->owner, (long)vm, 0);
}
}