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
if (bo->type != ttm_bo_type_sg)
fbo->base.base.resv = &fbo->base.base._resv;
+ if (fbo->base.resource) {
+ ttm_resource_set_bo(fbo->base.resource, &fbo->base);
+ bo->resource = NULL;
+ }
+
dma_resv_init(&fbo->base.base._resv);
fbo->base.base.dev = NULL;
ret = dma_resv_trylock(&fbo->base.base._resv);
ghost_obj->ttm = NULL;
else
bo->ttm = NULL;
- bo->resource = NULL;
dma_resv_unlock(&ghost_obj->base._resv);
ttm_bo_put(ghost_obj);
dma_resv_unlock(&ghost->base._resv);
ttm_bo_put(ghost);
bo->ttm = ttm;
- bo->resource = NULL;
ttm_bo_assign_mem(bo, sys_res);
return 0;
res->bus.offset = 0;
res->bus.is_iomem = false;
res->bus.caching = ttm_cached;
+ res->bo = bo;
}
EXPORT_SYMBOL(ttm_resource_init);
}
EXPORT_SYMBOL(ttm_resource_compat);
+void ttm_resource_set_bo(struct ttm_resource *res,
+ struct ttm_buffer_object *bo)
+{
+ spin_lock(&bo->bdev->lru_lock);
+ res->bo = bo;
+ spin_unlock(&bo->bdev->lru_lock);
+}
+
/**
* ttm_resource_manager_init
*
* @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.
uint32_t mem_type;
uint32_t placement;
struct ttm_bus_placement bus;
+ 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,