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drm/amdgpu: cleanup and simplify amdgpu_vmid_grab_reserved

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Drop the "_locked" from the name, cleanup and simplify the logic a bit.
Add missing comments.

Signed-off-by: Christian König <christian.koenig@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 2018-01-31 11:56:53 +01:00 committed by Alex Deucher
parent 782dcfdfd9
commit cb5372ace9
1 changed files with 35 additions and 23 deletions
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58
drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
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@ -248,12 +248,22 @@ static int amdgpu_vmid_grab_idle(struct amdgpu_vm *vm,
return 0;
}
/* idr_mgr->lock must be held */
static int amdgpu_vmid_grab_reserved_locked(struct amdgpu_vm *vm,
struct amdgpu_ring *ring,
struct amdgpu_sync *sync,
struct dma_fence *fence,
struct amdgpu_job *job)
/**
* amdgpu_vm_grab_reserved - try to assign reserved VMID
*
* @vm: vm to allocate id for
* @ring: ring we want to submit job to
* @sync: sync object where we add dependencies
* @fence: fence protecting ID from reuse
* @job: job who wants to use the VMID
*
* Try to assign a reserved VMID.
*/
static int amdgpu_vmid_grab_reserved(struct amdgpu_vm *vm,
struct amdgpu_ring *ring,
struct amdgpu_sync *sync,
struct dma_fence *fence,
struct amdgpu_job *job)
{
struct amdgpu_device *adev = ring->adev;
unsigned vmhub = ring->funcs->vmhub;
@ -261,18 +271,21 @@ static int amdgpu_vmid_grab_reserved_locked(struct amdgpu_vm *vm,
struct amdgpu_vmid *id = vm->reserved_vmid[vmhub];
struct amdgpu_vmid_mgr *id_mgr = &adev->vm_manager.id_mgr[vmhub];
struct dma_fence *updates = sync->last_vm_update;
int r = 0;
struct dma_fence *flushed, *tmp;
bool needs_flush = vm->use_cpu_for_update;
int r = 0;
if (updates && id->flushed_updates &&
updates->context == id->flushed_updates->context &&
!dma_fence_is_later(updates, id->flushed_updates))
updates = NULL;
if (id->owner != vm->entity.fence_context ||
job->vm_pd_addr != id->pd_gpu_addr ||
updates || !id->last_flush ||
(id->last_flush->context != fence_context &&
!dma_fence_is_signaled(id->last_flush))) {
struct dma_fence *tmp;
flushed = id->flushed_updates;
if ((id->owner != vm->entity.fence_context) ||
(job->vm_pd_addr != id->pd_gpu_addr) ||
(updates && (!flushed || updates->context != flushed->context ||
dma_fence_is_later(updates, flushed))) ||
(!id->last_flush || (id->last_flush->context != fence_context &&
!dma_fence_is_signaled(id->last_flush)))) {
needs_flush = true;
/* to prevent one context starved by another context */
id->pd_gpu_addr = 0;
tmp = amdgpu_sync_peek_fence(&id->active, ring);
@ -280,6 +293,7 @@ static int amdgpu_vmid_grab_reserved_locked(struct amdgpu_vm *vm,
r = amdgpu_sync_fence(adev, sync, tmp, false);
return r;
}
needs_flush = true;
}
/* Good we can use this VMID. Remember this submission as
@ -287,10 +301,9 @@ static int amdgpu_vmid_grab_reserved_locked(struct amdgpu_vm *vm,
*/
r = amdgpu_sync_fence(ring->adev, &id->active, fence, false);
if (r)
goto out;
return r;
if (updates && (!flushed || updates->context != flushed->context ||
dma_fence_is_later(updates, flushed))) {
if (updates) {
dma_fence_put(id->flushed_updates);
id->flushed_updates = dma_fence_get(updates);
}
@ -304,8 +317,7 @@ static int amdgpu_vmid_grab_reserved_locked(struct amdgpu_vm *vm,
job->vmid = id - id_mgr->ids;
job->pasid = vm->pasid;
trace_amdgpu_vm_grab_id(vm, ring, job);
out:
return r;
return 0;
}
/**
@ -315,6 +327,7 @@ out:
* @ring: ring we want to submit job to
* @sync: sync object where we add dependencies
* @fence: fence protecting ID from reuse
* @job: job who wants to use the VMID
*
* Allocate an id for the vm, adding fences to the sync obj as necessary.
*/
@ -336,8 +349,7 @@ int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
goto error;
if (vm->reserved_vmid[vmhub]) {
r = amdgpu_vmid_grab_reserved_locked(vm, ring, sync,
fence, job);
r = amdgpu_vmid_grab_reserved(vm, ring, sync, fence, job);
mutex_unlock(&id_mgr->lock);
return r;
}