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drm/ttm: add a weak BO reference to the resource v3

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Keep track for which BO a resource was allocated.
This is necessary to move the LRU handling into the resources.

A bit problematic is i915 since it tries to use the resource
interface without a BO which is illegal from the conceptional
point of view.

v2: Document that this is a weak reference and add a workaround for i915
v3: further document that this is protected by ttm_device::lru_lock and
    clarify the i915 workaround

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Huang Rui <ray.huang@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220124122514.1832-4-christian.koenig@amd.com
This commit is contained in:
Christian König
2021-07-15 14:17:19 +02:00
parent 3f268ef06f
commit fda8d552c9
3 changed files with 18 additions and 2 deletions
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4
include/drm/ttm/ttm_resource.h
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@@ -161,6 +161,7 @@ struct ttm_bus_placement {
* @mem_type: Resource type of the allocation.
* @placement: Placement flags.
* @bus: Placement on io bus accessible to the CPU
* @bo: weak reference to the BO, protected by ttm_device::lru_lock
*
* Structure indicating the placement and space resources used by a
* buffer object.
@@ -171,6 +172,7 @@ struct ttm_resource {
uint32_t mem_type;
uint32_t placement;
struct ttm_bus_placement bus;
struct ttm_buffer_object *bo;
};
/**
@@ -271,6 +273,8 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
void ttm_resource_free(struct ttm_buffer_object *bo, struct ttm_resource **res);
bool ttm_resource_compat(struct ttm_resource *res,
struct ttm_placement *placement);
void ttm_resource_set_bo(struct ttm_resource *res,
struct ttm_buffer_object *bo);
void ttm_resource_manager_init(struct ttm_resource_manager *man,
struct ttm_device *bdev,