[PATCH v7 7/8] drm/i915: Use error code as -E2BIG when the size of gem ttm object is too large

From: Gwan-gyeong Mun
Date: Tue Aug 16 2022 - 06:13:17 EST


The ttm_bo_init_reserved() functions returns -ENOSPC if the size is too big
to add vma. The direct function that returns -ENOSPC is drm_mm_insert_node_in_range().
To handle the same error as other code returning -E2BIG when the size is
too large, it converts return value to -E2BIG.

Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
Reviewed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Reviewed-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_ttm.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
index 69805cbe850c..8a5589accdb2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm.c
@@ -1249,6 +1249,17 @@ int __i915_gem_ttm_object_init(struct intel_memory_region *mem,
ret = ttm_bo_init_reserved(&i915->bdev, i915_gem_to_ttm(obj), bo_type,
&i915_sys_placement, page_size >> PAGE_SHIFT,
&ctx, NULL, NULL, i915_ttm_bo_destroy);
+
+ /*
+ * XXX: The ttm_bo_init_reserved() functions returns -ENOSPC if the size
+ * is too big to add vma. The direct function that returns -ENOSPC is
+ * drm_mm_insert_node_in_range(). To handle the same error as other code
+ * that returns -E2BIG when the size is too large, it converts -ENOSPC to
+ * -E2BIG.
+ */
+ if (size >> PAGE_SHIFT > INT_MAX && ret == -ENOSPC)
+ ret = -E2BIG;
+
if (ret)
return i915_ttm_err_to_gem(ret);

--
2.37.1