We tried this once before, but that turned out to be more
complicated than thought. With all the right prerequisites
it looks like we can do this now.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo.c | 127 ++++++++++++++++++-----------------
1 file changed, 66 insertions(+), 61 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index b29799aedb71..fd6dbebea430 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -892,13 +892,12 @@ static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
* space, or we've evicted everything and there isn't enough space.
*/
static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
- uint32_t mem_type,
- const struct ttm_place *place,
- struct ttm_mem_reg *mem,
- struct ttm_operation_ctx *ctx)
+ const struct ttm_place *place,
+ struct ttm_mem_reg *mem,
+ struct ttm_operation_ctx *ctx)
{
struct ttm_bo_device *bdev = bo->bdev;
- struct ttm_mem_type_manager *man = &bdev->man[mem_type];
+ struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
int ret;
do {
@@ -907,11 +906,11 @@ static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
return ret;
if (mem->mm_node)
break;
- ret = ttm_mem_evict_first(bdev, mem_type, place, ctx);
+ ret = ttm_mem_evict_first(bdev, mem->mem_type, place, ctx);
if (unlikely(ret != 0))
return ret;
} while (1);
- mem->mem_type = mem_type;
+
return ttm_bo_add_move_fence(bo, man, mem);
}
@@ -959,6 +958,51 @@ static bool ttm_bo_mt_compatible(struct ttm_mem_type_manager *man,
return true;
}
+/**
+ * ttm_bo_mem_placement - check if placement is compatible
+ * @bo: BO to find memory for
+ * @place: where to search
+ * @mem: the memory object to fill in
+ * @ctx: operation context
+ *
+ * Check if placement is compatible and fill in mem structure.
+ * Returns -EBUSY if placement won't work or negative error code.
+ * 0 when placement can be used.
+ */
+static int ttm_bo_mem_placement(struct ttm_buffer_object *bo,
+ const struct ttm_place *place,
+ struct ttm_mem_reg *mem,
+ struct ttm_operation_ctx *ctx)
+{
+ struct ttm_bo_device *bdev = bo->bdev;
+ uint32_t mem_type = TTM_PL_SYSTEM;
+ struct ttm_mem_type_manager *man;
+ uint32_t cur_flags = 0;
+ int ret;
+
+ ret = ttm_mem_type_from_place(place, &mem_type);
+ if (ret)
+ return ret;
+
+ man = &bdev->man[mem_type];
+ if (!man->has_type || !man->use_type)
+ return -EBUSY;
+
+ if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
+ return -EBUSY;
+
+ cur_flags = ttm_bo_select_caching(man, bo->mem.placement, cur_flags);
+ /*
+ * Use the access and other non-mapping-related flag bits from
+ * the memory placement flags to the current flags
+ */
+ ttm_flag_masked(&cur_flags, place->flags, ~TTM_PL_MASK_MEMTYPE);
+
+ mem->mem_type = mem_type;
+ mem->placement = cur_flags;
+ return 0;
+}
+
/**
* Creates space for memory region @mem according to its type.
*
@@ -973,11 +1017,7 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
struct ttm_operation_ctx *ctx)
{
struct ttm_bo_device *bdev = bo->bdev;
- struct ttm_mem_type_manager *man;
- uint32_t mem_type = TTM_PL_SYSTEM;
- uint32_t cur_flags = 0;
bool type_found = false;
- bool type_ok = false;
int i, ret;
ret = reservation_object_reserve_shared(bo->resv, 1);
@@ -987,37 +1027,20 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
mem->mm_node = NULL;
for (i = 0; i < placement->num_placement; ++i) {
const struct ttm_place *place = &placement->placement[i];
+ struct ttm_mem_type_manager *man;
- ret = ttm_mem_type_from_place(place, &mem_type);
+ ret = ttm_bo_mem_placement(bo, place, mem, ctx);
+ if (ret == -EBUSY)
+ continue;
if (ret)
return ret;
- man = &bdev->man[mem_type];
- if (!man->has_type || !man->use_type)
- continue;
-
- type_ok = ttm_bo_mt_compatible(man, mem_type, place,
- &cur_flags);
-
- if (!type_ok)
- continue;
type_found = true;
- cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
- cur_flags);
- /*
- * Use the access and other non-mapping-related flag bits from
- * the memory placement flags to the current flags
- */
- ttm_flag_masked(&cur_flags, place->flags,
- ~TTM_PL_MASK_MEMTYPE);
-
- if (mem_type == TTM_PL_SYSTEM) {
- mem->mem_type = mem_type;
- mem->placement = cur_flags;
- mem->mm_node = NULL;
+ mem->mm_node = NULL;
+ if (mem->mem_type == TTM_PL_SYSTEM)
return 0;
- }
+ man = &bdev->man[mem->mem_type];
ret = (*man->func->get_node)(man, bo, place, mem);
if (unlikely(ret))
return ret;
@@ -1028,8 +1051,6 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
(*man->func->put_node)(man, mem);
return ret;
}
- mem->mem_type = mem_type;
- mem->placement = cur_flags;
return 0;
}
}
@@ -1037,37 +1058,21 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
for (i = 0; i < placement->num_busy_placement; ++i) {
const struct ttm_place *place = &placement->busy_placement[i];
- ret = ttm_mem_type_from_place(place, &mem_type);
+ ret = ttm_bo_mem_placement(bo, place, mem, ctx);
+ if (ret == -EBUSY)
+ continue;
if (ret)
return ret;
- man = &bdev->man[mem_type];
- if (!man->has_type || !man->use_type)
- continue;
- if (!ttm_bo_mt_compatible(man, mem_type, place, &cur_flags))
- continue;
type_found = true;
- cur_flags = ttm_bo_select_caching(man, bo->mem.placement,
- cur_flags);
- /*
- * Use the access and other non-mapping-related flag bits from
- * the memory placement flags to the current flags
- */
- ttm_flag_masked(&cur_flags, place->flags,
- ~TTM_PL_MASK_MEMTYPE);
-
- if (mem_type == TTM_PL_SYSTEM) {
- mem->mem_type = mem_type;
- mem->placement = cur_flags;
- mem->mm_node = NULL;
+ mem->mm_node = NULL;
+ if (mem->mem_type == TTM_PL_SYSTEM)
return 0;
- }
- ret = ttm_bo_mem_force_space(bo, mem_type, place, mem, ctx);
- if (ret == 0 && mem->mm_node) {
- mem->placement = cur_flags;
+ ret = ttm_bo_mem_force_space(bo, place, mem, ctx);
+ if (ret == 0 && mem->mm_node)
return 0;
- }
+
if (ret && ret != -EBUSY)
return ret;
}
--
2.17.1
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