diff options
Diffstat (limited to 'include/drm/ttm')
| -rw-r--r-- | include/drm/ttm/ttm_bo_api.h | 60 | ||||
| -rw-r--r-- | include/drm/ttm/ttm_bo_driver.h | 2 |
2 files changed, 60 insertions, 2 deletions
diff --git a/include/drm/ttm/ttm_bo_api.h b/include/drm/ttm/ttm_bo_api.h index 8f619f499e55..0b1ce05e2c2e 100644 --- a/include/drm/ttm/ttm_bo_api.h +++ b/include/drm/ttm/ttm_bo_api.h @@ -440,6 +440,60 @@ size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev, unsigned struct_size); /** + * ttm_bo_init_reserved + * + * @bdev: Pointer to a ttm_bo_device struct. + * @bo: Pointer to a ttm_buffer_object to be initialized. + * @size: Requested size of buffer object. + * @type: Requested type of buffer object. + * @flags: Initial placement flags. + * @page_alignment: Data alignment in pages. + * @interruptible: If needing to sleep to wait for GPU resources, + * sleep interruptible. + * @persistent_swap_storage: Usually the swap storage is deleted for buffers + * pinned in physical memory. If this behaviour is not desired, this member + * holds a pointer to a persistent shmem object. Typically, this would + * point to the shmem object backing a GEM object if TTM is used to back a + * GEM user interface. + * @acc_size: Accounted size for this object. + * @resv: Pointer to a reservation_object, or NULL to let ttm allocate one. + * @destroy: Destroy function. Use NULL for kfree(). + * + * This function initializes a pre-allocated struct ttm_buffer_object. + * As this object may be part of a larger structure, this function, + * together with the @destroy function, + * enables driver-specific objects derived from a ttm_buffer_object. + * + * On successful return, the caller owns an object kref to @bo. The kref and + * list_kref are usually set to 1, but note that in some situations, other + * tasks may already be holding references to @bo as well. + * Furthermore, if resv == NULL, the buffer's reservation lock will be held, + * and it is the caller's responsibility to call ttm_bo_unreserve. + * + * If a failure occurs, the function will call the @destroy function, or + * kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is + * illegal and will likely cause memory corruption. + * + * Returns + * -ENOMEM: Out of memory. + * -EINVAL: Invalid placement flags. + * -ERESTARTSYS: Interrupted by signal while sleeping waiting for resources. + */ + +extern int ttm_bo_init_reserved(struct ttm_bo_device *bdev, + struct ttm_buffer_object *bo, + unsigned long size, + enum ttm_bo_type type, + struct ttm_placement *placement, + uint32_t page_alignment, + bool interrubtible, + struct file *persistent_swap_storage, + size_t acc_size, + struct sg_table *sg, + struct reservation_object *resv, + void (*destroy) (struct ttm_buffer_object *)); + +/** * ttm_bo_init * * @bdev: Pointer to a ttm_bo_device struct. @@ -463,7 +517,11 @@ size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev, * As this object may be part of a larger structure, this function, * together with the @destroy function, * enables driver-specific objects derived from a ttm_buffer_object. - * On successful return, the object kref and list_kref are set to 1. + * + * On successful return, the caller owns an object kref to @bo. The kref and + * list_kref are usually set to 1, but note that in some situations, other + * tasks may already be holding references to @bo as well. + * * If a failure occurs, the function will call the @destroy function, or * kfree() if @destroy is NULL. Thus, after a failure, dereferencing @bo is * illegal and will likely cause memory corruption. diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h index 8145773c582c..3641c6128ac2 100644 --- a/include/drm/ttm/ttm_bo_driver.h +++ b/include/drm/ttm/ttm_bo_driver.h @@ -42,7 +42,7 @@ #include <linux/spinlock.h> #include <linux/reservation.h> -#define TTM_MAX_BO_PRIORITY 16U +#define TTM_MAX_BO_PRIORITY 4U struct ttm_backend_func { /** |