[Devel] [PATCH hci-8.1 5/6] ms/drm/ttm: Convert -EAGAIN from dmem_cgroup_try_charge to -ENOSPC

[Mirian Shilakadze]

From: Thomas Hellström <thomas.hellstrom at linux.intel.com>

dmem_cgroup_try_charge() returns -EAGAIN when the cgroup limit is
hit and the charge fails. TTM has no concept of -EAGAIN from resource
allocation; -ENOSPC is the canonical error meaning "no space, try
eviction". Convert at the source in ttm_resource_alloc() so no caller
needs to handle an unexpected error code, and clean up the now-redundant
-EAGAIN check in ttm_bo_alloc_resource().

Without this, -EAGAIN escaping ttm_resource_alloc() during an eviction
walk causes the walk to terminate early instead of continuing to the
next candidate.

Cc: Friedrich Vock <friedrich.vock at gmx.de>
Cc: Maarten Lankhorst <dev at lankhorst.se>
Cc: Tejun Heo <tj at kernel.org>
Cc: Maxime Ripard <mripard at kernel.org>
Cc: Christian Koenig <christian.koenig at amd.com>
Cc: dri-devel at lists.freedesktop.org
Cc: <stable at vger.kernel.org> # v6.14+
Fixes: 2b624a2c1865 ("drm/ttm: Handle cgroup based eviction in TTM")
Assisted-by: GitHub_Copilot:claude-sonnet-4.6
Signed-off-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Reviewed-by: Maarten Lankhorst <dev at lankhrost.se>
Link: https://patch.msgid.link/20260508160920.230339-1-thomas.hellstrom@linux.intel.com
(cherry picked from commit 591711b32681a04b57d00c2a404658f8419a081c)

https://virtuozzo.atlassian.net/browse/VSTOR-152813
Signed-off-by: Mirian Shilakadze <mirian.shilakadze at virtuozzo.com>
---
 drivers/gpu/drm/ttm/ttm_bo.c       | 2 +-
 drivers/gpu/drm/ttm/ttm_resource.c | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index 29423ceeec5c..cf0e785aa9d3 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -739,7 +739,7 @@ static int ttm_bo_alloc_resource(struct ttm_buffer_object *bo,
 		may_evict = (force_space && place->mem_type != TTM_PL_SYSTEM);
 		ret = ttm_resource_alloc(bo, place, res, force_space ? &limit_pool : NULL);
 		if (ret) {
-			if (ret != -ENOSPC && ret != -EAGAIN) {
+			if (ret != -ENOSPC) {
 				dmem_cgroup_pool_state_put(limit_pool);
 				return ret;
 			}
diff --git a/drivers/gpu/drm/ttm/ttm_resource.c b/drivers/gpu/drm/ttm/ttm_resource.c
index e2c82ad07eb4..2a05fbd07546 100644
--- a/drivers/gpu/drm/ttm/ttm_resource.c
+++ b/drivers/gpu/drm/ttm/ttm_resource.c
@@ -384,8 +384,11 @@ int ttm_resource_alloc(struct ttm_buffer_object *bo,
 
 	if (man->cg) {
 		ret = dmem_cgroup_try_charge(man->cg, bo->base.size, &pool, ret_limit_pool);
-		if (ret)
+		if (ret) {
+			if (ret == -EAGAIN)
+				ret = -ENOSPC;
 			return ret;
+		}
 	}
 
 	ret = man->func->alloc(man, bo, place, res_ptr);
-- 
2.43.0