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drm/amdgpu: make VMID assignment more fair v2

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Similar to finding an idle one before reuse.

This guarantees fairness between processes. Otherwise process with a reserved
VMID have an unfair advantage while scheduling jobs.

v2: improve commit message

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-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 10:16:26 +01:00 committed by Alex Deucher
parent a20ee0b1f8
commit 8fe27f8fa0
1 changed files with 7 additions and 5 deletions
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12
drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
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@ -268,11 +268,6 @@ int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
int r = 0;
mutex_lock(&id_mgr->lock);
if (vm->reserved_vmid[vmhub]) {
r = amdgpu_vmid_grab_reserved_locked(vm, ring, sync, fence, job);
mutex_unlock(&id_mgr->lock);
return r;
}
fences = kmalloc_array(sizeof(void *), id_mgr->num_ids, GFP_KERNEL);
if (!fences) {
mutex_unlock(&id_mgr->lock);
@ -319,6 +314,13 @@ int amdgpu_vmid_grab(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
}
kfree(fences);
if (vm->reserved_vmid[vmhub]) {
r = amdgpu_vmid_grab_reserved_locked(vm, ring, sync,
fence, job);
mutex_unlock(&id_mgr->lock);
return r;
}
job->vm_needs_flush = vm->use_cpu_for_update;
/* Check if we can use a VMID already assigned to this VM */
list_for_each_entry_reverse(id, &id_mgr->ids_lru, list) {