drm/i915: Exclude reserved stolen from driver use

ickle · ramalingamc · commit 0ef42fb749b1 · 2021-12-14T15:08:19.000+05:30
Remove the portion of stolen memory reserved for private use from driver access. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> cc: Matthew Auld <matthew.auld@intel.com> Signed-off-by: Ramalingam C <ramalingam.c@intel.com> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211208153404.27546-2-ramalingam.c@intel.com
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -488,6 +488,9 @@ static int i915_gem_init_stolen(struct intel_memory_region *mem)
 		return 0;
 	}
 
+	/* Exclude the reserved region from driver use */
+	mem->region.end = reserved_base - 1;
+
 	/* It is possible for the reserved area to end before the end of stolen
 	 * memory, so just consider the start. */
 	reserved_total = stolen_top - reserved_base;

Original file line number	Diff line number	Diff line change
`@@ -488,6 +488,9 @@ static int i915_gem_init_stolen(struct intel_memory_region *mem)`
`488`	`488`	`return 0;`
`489`	`489`	`}`
`490`	`490`
	`491`	`+ /* Exclude the reserved region from driver use */`
	`492`	`+ mem->region.end = reserved_base - 1;`
	`493`	`+`
`491`	`494`	`/* It is possible for the reserved area to end before the end of stolen`
`492`	`495`	`* memory, so just consider the start. */`
`493`	`496`	`reserved_total = stolen_top - reserved_base;`