linux-kernel - [PATCH AUTOSEL 6.6 05/75] drm/ttm: return ENOSPC from ttm_bo_mem

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Date: Fri, 29 Mar 2024 08:41:46 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Christian König <christian.koenig@....com>,
	Zack Rusin <zack.rusin@...adcom.com>,
	Thomas Hellström <thomas.hellstrom@...ux.intel.com>,
	Sasha Levin <sashal@...nel.org>,
	ray.huang@....com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	daniel@...ll.ch,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.6 05/75] drm/ttm: return ENOSPC from ttm_bo_mem_space v3

From: Christian König <christian.koenig@....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@....com>
Reviewed-by: Zack Rusin <zack.rusin@...adcom.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240112125158.2748-3-christian.koenig@amd.com
Signed-off-by: Sasha Levin <sashal@...nel.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 e58b7e2498166..b3e5185835c37 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -764,7 +764,7 @@ 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.
  */
@@ -824,7 +824,7 @@ 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;
@@ -910,6 +910,9 @@ 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