On 17/10/2016 09:00, Chris Wilson wrote:
The scattergather list uses a 32bit size counter, we should avoid
exceeding it.
v2: Also we should use unsigned int to match sg->length.
Fixes: 871dfbd67d4e ("drm/i915: Allow compaction upto SWIOTLB max segment size")
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> # v1
---
drivers/gpu/drm/i915/i915_gem.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 181bda2db587..a74ec10a5370 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2205,7 +2205,7 @@ i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
return 0;
}
-static unsigned long swiotlb_max_size(void)
+static unsigned int swiotlb_max_size(void)
{
#if IS_ENABLED(CONFIG_SWIOTLB)
return rounddown(swiotlb_nr_tbl() << IO_TLB_SHIFT, PAGE_SIZE);
@@ -2225,7 +2225,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
struct sgt_iter sgt_iter;
struct page *page;
unsigned long last_pfn = 0; /* suppress gcc warning */
- unsigned long max_segment;
+ unsigned int max_segment;
int ret;
gfp_t gfp;
@@ -2238,7 +2238,7 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj)
max_segment = swiotlb_max_size();
if (!max_segment)
- max_segment = obj->base.size;
+ max_segment = rounddown(UINT_MAX, PAGE_SIZE);
rounddown looks like an overkill vs just UINT_MAX, no?
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL)
Anyway,
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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