drm/ttm: replace context flags with bools v2

The ttm_operation_ctx structure has a mixture of flags and bools. Drop the
flags and replace them with bools as well.

v2: fix typos, improve comments
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/398686/

drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c

@@ -404,8 +404,7 @@ static int amdgpu_cs_bo_validate(struct amdgpu_cs_parser *p,
 	struct ttm_operation_ctx ctx = {
 		.interruptible = true,
 		.no_wait_gpu = false,
-		.resv = bo->tbo.base.resv,
-		.flags = 0
+		.resv = bo->tbo.base.resv
 	};
 	uint32_t domain;
 	int r;

drivers/gpu/drm/amd/amdgpu/amdgpu_object.c

@@ -518,9 +518,8 @@ static int amdgpu_bo_do_create(struct amdgpu_device *adev,
 		.no_wait_gpu = bp->no_wait_gpu,
 		/* We opt to avoid OOM on system pages allocations */
 		.gfp_retry_mayfail = true,
-		.resv = bp->resv,
-		.flags = bp->type != ttm_bo_type_kernel ?
-			TTM_OPT_FLAG_ALLOW_RES_EVICT : 0
+		.allow_res_evict = bp->type != ttm_bo_type_kernel,
+		.resv = bp->resv
 	};
 	struct amdgpu_bo *bo;
 	unsigned long page_align, size = bp->size;

drivers/gpu/drm/ttm/ttm_bo.c

@@ -637,7 +637,7 @@ static bool ttm_bo_evict_swapout_allowable(struct ttm_buffer_object *bo,
 
 	if (bo->base.resv == ctx->resv) {
 		dma_resv_assert_held(bo->base.resv);
-		if (ctx->flags & TTM_OPT_FLAG_ALLOW_RES_EVICT)
+		if (ctx->allow_res_evict)
 			ret = true;
 		*locked = false;
 		if (busy)

drivers/gpu/drm/ttm/ttm_bo_vm.c

@@ -315,8 +315,7 @@ vm_fault_t ttm_bo_vm_fault_reserved(struct vm_fault *vmf,
 		struct ttm_operation_ctx ctx = {
 			.interruptible = false,
 			.no_wait_gpu = false,
-			.flags = TTM_OPT_FLAG_FORCE_ALLOC
-
+			.force_alloc = true
 		};
 
 		ttm = bo->ttm;

drivers/gpu/drm/ttm/ttm_memory.c

@@ -542,7 +542,8 @@ ttm_check_under_lowerlimit(struct ttm_mem_global *glob,
 {
 	int64_t available;
 
-	if (ctx->flags & TTM_OPT_FLAG_FORCE_ALLOC)
+	/* We allow over commit during suspend */
+	if (ctx->force_alloc)
 		return false;
 
 	available = get_nr_swap_pages() + si_mem_available();

drivers/gpu/drm/ttm/ttm_resource.c

@@ -89,7 +89,7 @@ int ttm_resource_manager_evict_all(struct ttm_bo_device *bdev,
 	struct ttm_operation_ctx ctx = {
 		.interruptible = false,
 		.no_wait_gpu = false,
-		.flags = TTM_OPT_FLAG_FORCE_ALLOC
+		.force_alloc = true
 	};
 	struct ttm_bo_global *glob = &ttm_bo_glob;
 	struct dma_fence *fence;

include/drm/ttm/ttm_bo_api.h

@@ -196,8 +196,11 @@ struct ttm_bo_kmap_obj {
  * @interruptible: Sleep interruptible if sleeping.
  * @no_wait_gpu: Return immediately if the GPU is busy.
  * @gfp_retry_mayfail: Set the __GFP_RETRY_MAYFAIL when allocation pages.
+ * @allow_res_evict: Allow eviction of reserved BOs. Can be used when multiple
+ * BOs share the same reservation object.
+ * @force_alloc: Don't check the memory account during suspend or CPU page
+ * faults. Should only be used by TTM internally.
  * @resv: Reservation object to allow reserved evictions with.
- * @flags: Including the following flags
  *
  * Context for TTM operations like changing buffer placement or general memory
  * allocation.
@@ -206,16 +209,12 @@ struct ttm_operation_ctx {
 	bool interruptible;
 	bool no_wait_gpu;
 	bool gfp_retry_mayfail;
+	bool allow_res_evict;
+	bool force_alloc;
 	struct dma_resv *resv;
 	uint64_t bytes_moved;
-	uint32_t flags;
 };
 
-/* Allow eviction of reserved BOs */
-#define TTM_OPT_FLAG_ALLOW_RES_EVICT		0x1
-/* when serving page fault or suspend, allow alloc anyway */
-#define TTM_OPT_FLAG_FORCE_ALLOC		0x2
-
 /**
  * ttm_bo_get - reference a struct ttm_buffer_object
  *