---
drivers/gpu/drm/ttm/ttm_bo.c | 231 +++++++++++++-------
-------
--
drivers/gpu/drm/ttm/ttm_resource.c | 16 +-
include/drm/ttm/ttm_resource.h | 3 +-
3 files changed, 121 insertions(+), 129 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c
b/drivers/gpu/drm/ttm/ttm_bo.c
index ba3f09e2d7e6..b12f435542a9 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -724,64 +724,36 @@ static int ttm_bo_add_move_fence(struct
ttm_buffer_object *bo,
return ret;
}
-/*
- * Repeatedly evict memory from the LRU for @mem_type until we
create enough
- * space, or we've evicted everything and there isn't enough
space.
- */
-static int ttm_bo_mem_force_space(struct ttm_buffer_object
*bo,
- const struct ttm_place *place,
- struct ttm_resource **mem,
- struct ttm_operation_ctx *ctx)
-{
- struct ttm_device *bdev = bo->bdev;
- struct ttm_resource_manager *man;
- struct ww_acquire_ctx *ticket;
- int ret;
-
- man = ttm_manager_type(bdev, place->mem_type);
- ticket = dma_resv_locking_ctx(bo->base.resv);
- do {
- ret = ttm_resource_alloc(bo, place, mem);
- if (likely(!ret))
- break;
- if (unlikely(ret != -ENOSPC))
- return ret;
- ret = ttm_mem_evict_first(bdev, man, place, ctx,
- ticket);
- if (unlikely(ret != 0))
- return ret;
- } while (1);
-
- return ttm_bo_add_move_fence(bo, man, *mem, ctx-
no_wait_gpu);
-}
-
/**
- * ttm_bo_mem_space
+ * ttm_bo_alloc_resource - Allocate backing store for a BO
*
- * @bo: Pointer to a struct ttm_buffer_object. the data of
which
- * we want to allocate space for.
- * @placement: Proposed new placement for the buffer object.
- * @mem: A struct ttm_resource.
+ * @bo: Pointer to a struct ttm_buffer_object of which we want
a
resource for
+ * @placement: Proposed new placement for the buffer object
* @ctx: if and how to sleep, lock buffers and alloc memory
+ * @force_space: If we should evict buffers to force space
+ * @res: The resulting struct ttm_resource.
*
- * Allocate memory space for the buffer object pointed to by
@bo,
using
- * the placement flags in @placement, potentially evicting
other
idle buffer objects.
- * This function may sleep while waiting for space to become
available.
+ * Allocates a resource for the buffer object pointed to by
@bo,
using the
+ * placement flags in @placement, potentially evicting other
buffer
objects when
+ * @force_space is true.
+ * This function may sleep while waiting for resources to
become
available.
* Returns:
- * -EBUSY: No space available (only if no_wait == 1).
+ * -EBUSY: No space available (only if no_wait == true).
* -ENOSPC: Could not allocate space for the buffer object,
either
due to
* fragmentation or concurrent allocators.
* -ERESTARTSYS: An interruptible sleep was interrupted by a
signal.
*/
-int ttm_bo_mem_space(struct ttm_buffer_object *bo,
- struct ttm_placement *placement,
- struct ttm_resource **mem,
- struct ttm_operation_ctx *ctx)
+static int ttm_bo_alloc_resource(struct ttm_buffer_object *bo,
+ struct ttm_placement *placement,
+ struct ttm_operation_ctx *ctx,
+ bool force_space,
+ struct ttm_resource **res)
{
struct ttm_device *bdev = bo->bdev;
- bool type_found = false;
+ struct ww_acquire_ctx *ticket;
int i, ret;
+ ticket = dma_resv_locking_ctx(bo->base.resv);
ret = dma_resv_reserve_fences(bo->base.resv, 1);
if (unlikely(ret))
return ret;
@@ -790,98 +762,73 @@ int ttm_bo_mem_space(struct
ttm_buffer_object
*bo,
const struct ttm_place *place = &placement-
placement[i];
struct ttm_resource_manager *man;
- if (place->flags & TTM_PL_FLAG_FALLBACK)
- continue;
-
man = ttm_manager_type(bdev, place->mem_type);
if (!man || !ttm_resource_manager_used(man))
continue;
- type_found = true;
- ret = ttm_resource_alloc(bo, place, mem);
- if (ret == -ENOSPC)
+ if (place->flags & (force_space ?
TTM_PL_FLAG_DESIRED :
+ TTM_PL_FLAG_FALLBACK))
+ continue;
+
+ do {
+ ret = ttm_resource_alloc(bo, place, res);
+ if (unlikely(ret != -ENOSPC))
+ return ret;
+ if (likely(!ret) || !force_space)
+ break;
+
+ ret = ttm_mem_evict_first(bdev, man, place,
ctx,
+ ticket);
+ if (unlikely(ret == -EBUSY))
+ break;
+ if (unlikely(ret))
+ return ret;
+ } while (1);
+ if (ret)
continue;
- if (unlikely(ret))
- goto error;
- ret = ttm_bo_add_move_fence(bo, man, *mem, ctx-
no_wait_gpu);
+ ret = ttm_bo_add_move_fence(bo, man, *res, ctx-
no_wait_gpu);
if (unlikely(ret)) {
- ttm_resource_free(bo, mem);
+ ttm_resource_free(bo, res);
if (ret == -EBUSY)
continue;
- goto error;
+ return ret;
}
return 0;
}
- for (i = 0; i < placement->num_placement; ++i) {
- const struct ttm_place *place = &placement-
placement[i];
- struct ttm_resource_manager *man;
-
- if (place->flags & TTM_PL_FLAG_DESIRED)
- continue;
-
- man = ttm_manager_type(bdev, place->mem_type);
- if (!man || !ttm_resource_manager_used(man))
- continue;
-
- type_found = true;
- ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
- if (likely(!ret))
- return 0;
-
- if (ret && ret != -EBUSY)
- goto error;
- }
-
- ret = -ENOSPC;
- if (!type_found) {
- pr_err(TTM_PFX "No compatible memory type found\n");
- ret = -EINVAL;
- }
-
-error:
- return ret;
+ return -ENOSPC;
}
-EXPORT_SYMBOL(ttm_bo_mem_space);
-static int ttm_bo_move_buffer(struct ttm_buffer_object *bo,
- struct ttm_placement *placement,
- struct ttm_operation_ctx *ctx)
+/*
+ * ttm_bo_mem_space - Wrapper around ttm_bo_alloc_resource
+ *
+ * @bo: Pointer to a struct ttm_buffer_object of which we want
a
resource for
+ * @placement: Proposed new placement for the buffer object
+ * @res: The resulting struct ttm_resource.
+ * @ctx: if and how to sleep, lock buffers and alloc memory
+ *
+ * Tries both idle allocation and forcefully eviction of
buffers.
See
+ * ttm_bo_alloc_resource for details.
+ */
+int ttm_bo_mem_space(struct ttm_buffer_object *bo,
+ struct ttm_placement *placement,
+ struct ttm_resource **res,
+ struct ttm_operation_ctx *ctx)
{
- struct ttm_resource *mem;
- struct ttm_place hop;
+ bool force_space = false;
int ret;
- dma_resv_assert_held(bo->base.resv);
+ do {
+ ret = ttm_bo_alloc_resource(bo, placement, ctx,
+ force_space, res);
+ force_space = !force_space;
+ } while (ret == -ENOSPC && force_space);
- /*
- * Determine where to move the buffer.
- *
- * If driver determines move is going to need
- * an extra step then it will return -EMULTIHOP
- * and the buffer will be moved to the temporary
- * stop and the driver will be called to make
- * the second hop.
- */
- ret = ttm_bo_mem_space(bo, placement, &mem, ctx);
- if (ret)
- return ret;
-bounce:
- ret = ttm_bo_handle_move_mem(bo, mem, false, ctx, &hop);
- if (ret == -EMULTIHOP) {
- ret = ttm_bo_bounce_temp_buffer(bo, &mem, ctx,
&hop);
- if (ret)
- goto out;
- /* try and move to final place now. */
- goto bounce;
- }
-out:
- if (ret)
- ttm_resource_free(bo, &mem);
return ret;
}
+EXPORT_SYMBOL(ttm_bo_mem_space);
/**
* ttm_bo_validate
@@ -902,6 +849,9 @@ int ttm_bo_validate(struct
ttm_buffer_object *bo,
struct ttm_placement *placement,
struct ttm_operation_ctx *ctx)
{
+ struct ttm_resource *res;
+ struct ttm_place hop;
+ bool force_space;
int ret;
dma_resv_assert_held(bo->base.resv);
@@ -912,20 +862,53 @@ int ttm_bo_validate(struct
ttm_buffer_object
*bo,
if (!placement->num_placement)
return ttm_bo_pipeline_gutting(bo);
- /* Check whether we need to move buffer. */
- if (bo->resource && ttm_resource_compatible(bo->resource,
placement))
- return 0;
+ force_space = false;
+ do {
+ /* Check whether we need to move buffer. */
+ if (bo->resource &&
+ ttm_resource_compatible(bo->resource, placement,
+ force_space))
+ return 0;
- /* Moving of pinned BOs is forbidden */
- if (bo->pin_count)
- return -EINVAL;
+ /* Moving of pinned BOs is forbidden */
+ if (bo->pin_count)
+ return -EINVAL;
+
+ /*
+ * Determine where to move the buffer.
+ *
+ * If driver determines move is going to need
+ * an extra step then it will return -EMULTIHOP
+ * and the buffer will be moved to the temporary
+ * stop and the driver will be called to make
+ * the second hop.
+ */
+ ret = ttm_bo_alloc_resource(bo, placement, ctx,
force_space,
+ &res);
+ force_space = !force_space;
+ if (ret == -ENOSPC)
+ continue;
+ if (ret)
+ return ret;
+
+bounce:
+ ret = ttm_bo_handle_move_mem(bo, res, false, ctx,
&hop);
+ if (ret == -EMULTIHOP) {
+ ret = ttm_bo_bounce_temp_buffer(bo, &res,
ctx, &hop);
+ /* try and move to final place now. */
+ if (!ret)
+ goto bounce;
+ }
+ if (ret) {
+ ttm_resource_free(bo, &res);
+ return ret;
+ }
+
+ } while (ret && force_space);
- ret = ttm_bo_move_buffer(bo, placement, ctx);
/* For backward compatibility with userspace */
if (ret == -ENOSPC)
return -ENOMEM;
- if (ret)
- return ret;
/*
* We might need to add a TTM.
diff --git a/drivers/gpu/drm/ttm/ttm_resource.c
b/drivers/gpu/drm/ttm/ttm_resource.c
index fb14f7716cf8..65155f2013ca 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -295,11 +295,13 @@ bool ttm_resource_intersects(struct
ttm_device
*bdev,
*
* @res: the resource to check
* @placement: the placement to check against
+ * @evicting: true if the caller is doing evictions
*
* Returns true if the placement is compatible.
*/
bool ttm_resource_compatible(struct ttm_resource *res,
- struct ttm_placement *placement)
+ struct ttm_placement *placement,
+ bool evicting)
{
struct ttm_buffer_object *bo = res->bo;
struct ttm_device *bdev = bo->bdev;
@@ -315,14 +317,20 @@ bool ttm_resource_compatible(struct
ttm_resource *res,
if (res->mem_type != place->mem_type)
continue;
+ if (place->flags & (evicting ? TTM_PL_FLAG_DESIRED :
+ TTM_PL_FLAG_FALLBACK))
+ continue;
+
+ if (place->flags & TTM_PL_FLAG_CONTIGUOUS &&
+ !(res->placement & TTM_PL_FLAG_CONTIGUOUS))
+ continue;
+
man = ttm_manager_type(bdev, res->mem_type);
if (man->func->compatible &&
!man->func->compatible(man, res, place, bo-
base.size))
continue;
- if ((!(place->flags & TTM_PL_FLAG_CONTIGUOUS) ||
- (res->placement & TTM_PL_FLAG_CONTIGUOUS)))
- return true;
+ return true;
}
return false;
}
diff --git a/include/drm/ttm/ttm_resource.h
b/include/drm/ttm/ttm_resource.h
index 1afa13f0c22b..7561023db43d 100644
--- a/include/drm/ttm/ttm_resource.h
+++ b/include/drm/ttm/ttm_resource.h
@@ -366,7 +366,8 @@ bool ttm_resource_intersects(struct
ttm_device
*bdev,
const struct ttm_place *place,
size_t size);
bool ttm_resource_compatible(struct ttm_resource *res,
- struct ttm_placement *placement);
+ struct ttm_placement *placement,
+ bool evicting);
void ttm_resource_set_bo(struct ttm_resource *res,
struct ttm_buffer_object *bo);
