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drm/amdgpu: add limitation for dedicated vm number v4

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Limit reserved vmids to 1 to avoid taking too many
out of commission and starving the system.

v2: move #define to amdgpu_vm.h
v3: move reserved vmid counter to id_manager,
and increase counter before allocating vmid
v4: rename to reserved_vmid_num

Signed-off-by: Chunming Zhou <David1.Zhou@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Chunming Zhou
2017-04-21 15:51:04 +08:00
committed by Alex Deucher
parent 1e9ef26fb3
commit c350577073
2 changed files with 12 additions and 0 deletions
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9
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@@ -551,6 +551,7 @@ static void amdgpu_vm_free_reserved_vmid(struct amdgpu_device *adev,
list_add(&vm->reserved_vmid[vmhub]->list,
&id_mgr->ids_lru);
vm->reserved_vmid[vmhub] = NULL;
atomic_dec(&id_mgr->reserved_vmid_num);
}
mutex_unlock(&id_mgr->lock);
}
@@ -567,6 +568,13 @@ static int amdgpu_vm_alloc_reserved_vmid(struct amdgpu_device *adev,
mutex_lock(&id_mgr->lock);
if (vm->reserved_vmid[vmhub])
goto unlock;
if (atomic_inc_return(&id_mgr->reserved_vmid_num) >
AMDGPU_VM_MAX_RESERVED_VMID) {
DRM_ERROR("Over limitation of reserved vmid\n");
atomic_dec(&id_mgr->reserved_vmid_num);
r = -EINVAL;
goto unlock;
}
/* Select the first entry VMID */
idle = list_first_entry(&id_mgr->ids_lru, struct amdgpu_vm_id, list);
list_del_init(&idle->list);
@@ -2321,6 +2329,7 @@ void amdgpu_vm_manager_init(struct amdgpu_device *adev)
mutex_init(&id_mgr->lock);
INIT_LIST_HEAD(&id_mgr->ids_lru);
atomic_set(&id_mgr->reserved_vmid_num, 0);
/* skip over VMID 0, since it is the system VM */
for (j = 1; j < id_mgr->num_ids; ++j) {