[PATCH 6.8 063/143] drm/ttm: return ENOSPC from ttm_bo_mem_space v3

Greg Kroah-Hartman
2024-04-11T10:09:41Z

From: Christian König <christian.koenig@amd.com>

[ Upstream commit 28e5126718c7b306b8c29d2ae8f48417e9303aa1 ]

Only convert it to ENOMEM in ttm_bo_validate.

This allows ttm_bo_validate to distinguish between an out of memory
situation and just out of space in a placement domain.

v2: improve commit message
v3: fix kerneldoc typos

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Zack Rusin <zack.rusin@broadcom.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240112125158.2748-3-christian.koenig@amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/ttm/ttm_bo.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index edf10618fe2b2..f95b0406ca995 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -770,7 +770,7 @@ static int ttm_bo_mem_force_space(struct ttm_buffer_object *bo,
* This function may sleep while waiting for space to become available.
* Returns:
* -EBUSY: No space available (only if no_wait == 1).
- * -ENOMEM: Could not allocate memory for the buffer object, either due to
+ * -ENOSPC: Could not allocate space for the buffer object, either due to
* fragmentation or concurrent allocators.
* -ERESTARTSYS: An interruptible sleep was interrupted by a signal.
*/
@@ -830,7 +830,7 @@ int ttm_bo_mem_space(struct ttm_buffer_object *bo,
goto error;
}

- ret = -ENOMEM;
+ ret = -ENOSPC;
if (!type_found) {
pr_err(TTM_PFX "No compatible memory type found\n");
ret = -EINVAL;
@@ -916,6 +916,9 @@ int ttm_bo_validate(struct ttm_buffer_object *bo,
return -EINVAL;

ret = ttm_bo_move_buffer(bo, placement, ctx);
+ /* For backward compatibility with userspace */
+ if (ret == -ENOSPC)
+ return -ENOMEM;
if (ret)
return ret;

--
2.43.0