Unverified Commit a191f73d authored by Donald Robson's avatar Donald Robson Committed by Maxime Ripard
Browse files

drm/gpuvm: Helper to get range of unmap from a remap op. 



Determining the start and range of the unmap stage of a remap op is a
common piece of code currently implemented by multiple drivers. Add a
helper for this.

Changes since v7:
- Renamed helper to drm_gpuva_op_remap_to_unmap_range()
- Improved documentation

Changes since v6:
- Remove use of __always_inline

Signed-off-by: default avatarDonald Robson <donald.robson@imgtec.com>
Signed-off-by: default avatarSarah Walker <sarah.walker@imgtec.com>
Reviewed-by: default avatarDanilo Krummrich <dakr@redhat.com>
Link: https://lore.kernel.org/r/8a0a5b5eeec459d3c60fcdaa5a638ad14a18a59e.1700668843.git.donald.robson@imgtec.com


Signed-off-by: default avatarMaxime Ripard <mripard@kernel.org>
parent 66b73e9a

include/drm/drm_gpuvm.h

+28 −0
Original line number Diff line number Diff line
@@ -1213,4 +1213,32 @@ void drm_gpuva_remap(struct drm_gpuva *prev, 


void drm_gpuva_unmap(struct drm_gpuva_op_unmap *op);



/**

 * drm_gpuva_op_remap_to_unmap_range() - Helper to get the start and range of

 * the unmap stage of a remap op.

 * @op: Remap op.

 * @start_addr: Output pointer for the start of the required unmap.

 * @range: Output pointer for the length of the required unmap.

 *

 * The given start address and range will be set such that they represent the

 * range of the address space that was previously covered by the mapping being

 * re-mapped, but is now empty.

 */

static inline void

drm_gpuva_op_remap_to_unmap_range(const struct drm_gpuva_op_remap *op,

				  u64 *start_addr, u64 *range)

{

	const u64 va_start = op->prev ?

			     op->prev->va.addr + op->prev->va.range :

			     op->unmap->va->va.addr;

	const u64 va_end = op->next ?

			   op->next->va.addr :

			   op->unmap->va->va.addr + op->unmap->va->va.range;



	if (start_addr)

		*start_addr = va_start;

	if (range)

		*range = va_end - va_start;

}



#endif /* __DRM_GPUVM_H__ */