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drm/amdgpu: improve VM state machine documentation v2 

Since we have a lot of FAQ on the VM state machine try to improve the
documentation by adding functions for each state move.

v2: fix typo in amdgpu_vm_bo_invalidated, use amdgpu_vm_bo_relocated in
    one more place as well.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Junwei Zhang <Jerry.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2018-08-30 10:27:15 +02:00 committed by Alex Deucher
parent 0a53b69cce
commit bcdc9fd634
1 changed files with 109 additions and 32 deletions
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141
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
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@ -204,6 +204,95 @@ static unsigned amdgpu_vm_bo_size(struct amdgpu_device *adev, unsigned level)
return AMDGPU_GPU_PAGE_ALIGN(amdgpu_vm_num_entries(adev, level) * 8);
}
/**
* amdgpu_vm_bo_evicted - vm_bo is evicted
*
* @vm_bo: vm_bo which is evicted
*
* State for PDs/PTs and per VM BOs which are not at the location they should
* be.
*/
static void amdgpu_vm_bo_evicted(struct amdgpu_vm_bo_base *vm_bo)
{
struct amdgpu_vm *vm = vm_bo->vm;
struct amdgpu_bo *bo = vm_bo->bo;
vm_bo->moved = true;
if (bo->tbo.type == ttm_bo_type_kernel)
list_move(&vm_bo->vm_status, &vm->evicted);
else
list_move_tail(&vm_bo->vm_status, &vm->evicted);
}
/**
* amdgpu_vm_bo_relocated - vm_bo is reloacted
*
* @vm_bo: vm_bo which is relocated
*
* State for PDs/PTs which needs to update their parent PD.
*/
static void amdgpu_vm_bo_relocated(struct amdgpu_vm_bo_base *vm_bo)
{
list_move(&vm_bo->vm_status, &vm_bo->vm->relocated);
}
/**
* amdgpu_vm_bo_moved - vm_bo is moved
*
* @vm_bo: vm_bo which is moved
*
* State for per VM BOs which are moved, but that change is not yet reflected
* in the page tables.
*/
static void amdgpu_vm_bo_moved(struct amdgpu_vm_bo_base *vm_bo)
{
list_move(&vm_bo->vm_status, &vm_bo->vm->moved);
}
/**
* amdgpu_vm_bo_idle - vm_bo is idle
*
* @vm_bo: vm_bo which is now idle
*
* State for PDs/PTs and per VM BOs which have gone through the state machine
* and are now idle.
*/
static void amdgpu_vm_bo_idle(struct amdgpu_vm_bo_base *vm_bo)
{
list_move(&vm_bo->vm_status, &vm_bo->vm->idle);
vm_bo->moved = false;
}
/**
* amdgpu_vm_bo_invalidated - vm_bo is invalidated
*
* @vm_bo: vm_bo which is now invalidated
*
* State for normal BOs which are invalidated and that change not yet reflected
* in the PTs.
*/
static void amdgpu_vm_bo_invalidated(struct amdgpu_vm_bo_base *vm_bo)
{
spin_lock(&vm_bo->vm->invalidated_lock);
list_move(&vm_bo->vm_status, &vm_bo->vm->invalidated);
spin_unlock(&vm_bo->vm->invalidated_lock);
}
/**
* amdgpu_vm_bo_done - vm_bo is done
*
* @vm_bo: vm_bo which is now done
*
* State for normal BOs which are invalidated and that change has been updated
* in the PTs.
*/
static void amdgpu_vm_bo_done(struct amdgpu_vm_bo_base *vm_bo)
{
spin_lock(&vm_bo->vm->invalidated_lock);
list_del_init(&vm_bo->vm_status);
spin_unlock(&vm_bo->vm->invalidated_lock);
}
/**
* amdgpu_vm_bo_base_init - Adds bo to the list of bos associated with the vm
*
@ -232,9 +321,9 @@ static void amdgpu_vm_bo_base_init(struct amdgpu_vm_bo_base *base,
vm->bulk_moveable = false;
if (bo->tbo.type == ttm_bo_type_kernel)
list_move(&base->vm_status, &vm->relocated);
amdgpu_vm_bo_relocated(base);
else
list_move(&base->vm_status, &vm->idle);
amdgpu_vm_bo_idle(base);
if (bo->preferred_domains &
amdgpu_mem_type_to_domain(bo->tbo.mem.mem_type))
@ -245,8 +334,7 @@ static void amdgpu_vm_bo_base_init(struct amdgpu_vm_bo_base *base,
* is currently evicted. add the bo to the evicted list to make sure it
* is validated on next vm use to avoid fault.
* */
list_move_tail(&base->vm_status, &vm->evicted);
base->moved = true;
amdgpu_vm_bo_evicted(base);
}
/**
@ -342,7 +430,7 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
break;
if (bo->tbo.type != ttm_bo_type_kernel) {
list_move(&bo_base->vm_status, &vm->moved);
amdgpu_vm_bo_moved(bo_base);
} else {
if (vm->use_cpu_for_update)
r = amdgpu_bo_kmap(bo, NULL);
@ -350,7 +438,7 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
r = amdgpu_ttm_alloc_gart(&bo->tbo);
if (r)
break;
list_move(&bo_base->vm_status, &vm->relocated);
amdgpu_vm_bo_relocated(bo_base);
}
}
@ -1066,7 +1154,7 @@ static void amdgpu_vm_invalidate_level(struct amdgpu_device *adev,
continue;
if (!entry->base.moved)
list_move(&entry->base.vm_status, &vm->relocated);
amdgpu_vm_bo_relocated(&entry->base);
amdgpu_vm_invalidate_level(adev, vm, entry, level + 1);
}
}
@ -1121,8 +1209,7 @@ int amdgpu_vm_update_directories(struct amdgpu_device *adev,
bo_base = list_first_entry(&vm->relocated,
struct amdgpu_vm_bo_base,
vm_status);
bo_base->moved = false;
list_move(&bo_base->vm_status, &vm->idle);
amdgpu_vm_bo_idle(bo_base);
bo = bo_base->bo->parent;
if (!bo)
@ -1241,7 +1328,7 @@ static void amdgpu_vm_handle_huge_pages(struct amdgpu_pte_update_params *p,
if (entry->huge) {
/* Add the entry to the relocated list to update it. */
entry->huge = false;
list_move(&entry->base.vm_status, &p->vm->relocated);
amdgpu_vm_bo_relocated(&entry->base);
}
return;
}
@ -1740,13 +1827,11 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
uint32_t mem_type = bo->tbo.mem.mem_type;
if (!(bo->preferred_domains & amdgpu_mem_type_to_domain(mem_type)))
list_move_tail(&bo_va->base.vm_status, &vm->evicted);
amdgpu_vm_bo_evicted(&bo_va->base);
else
list_move(&bo_va->base.vm_status, &vm->idle);
amdgpu_vm_bo_idle(&bo_va->base);
} else {
spin_lock(&vm->invalidated_lock);
list_del_init(&bo_va->base.vm_status);
spin_unlock(&vm->invalidated_lock);
amdgpu_vm_bo_done(&bo_va->base);
}
list_splice_init(&bo_va->invalids, &bo_va->valids);
@ -2468,30 +2553,22 @@ void amdgpu_vm_bo_invalidate(struct amdgpu_device *adev,
list_for_each_entry(bo_base, &bo->va, bo_list) {
struct amdgpu_vm *vm = bo_base->vm;
bool was_moved = bo_base->moved;
bo_base->moved = true;
if (evicted && bo->tbo.resv == vm->root.base.bo->tbo.resv) {
if (bo->tbo.type == ttm_bo_type_kernel)
list_move(&bo_base->vm_status, &vm->evicted);
else
list_move_tail(&bo_base->vm_status,
&vm->evicted);
amdgpu_vm_bo_evicted(bo_base);
continue;
}
if (was_moved)
if (bo_base->moved)
continue;
bo_base->moved = true;
if (bo->tbo.type == ttm_bo_type_kernel) {
list_move(&bo_base->vm_status, &vm->relocated);
} else if (bo->tbo.resv == vm->root.base.bo->tbo.resv) {
list_move(&bo_base->vm_status, &vm->moved);
} else {
spin_lock(&vm->invalidated_lock);
list_move(&bo_base->vm_status, &vm->invalidated);
spin_unlock(&vm->invalidated_lock);
}
if (bo->tbo.type == ttm_bo_type_kernel)
amdgpu_vm_bo_relocated(bo_base);
else if (bo->tbo.resv == vm->root.base.bo->tbo.resv)
amdgpu_vm_bo_moved(bo_base);
else
amdgpu_vm_bo_invalidated(bo_base);
}
}