On 02/02/2017 09:47, Juergen Gross wrote:
Commit 920cf4194954ec ("drm/i915: Introduce an internal allocator for disposable private objects") introduced a regression for the kernel running as Xen dom0: when switching to graphics mode a GPU HANG occurred.
Reason seems to be a missing adaption similar to that done in commit 7453c549f5f648 ("swiotlb: Export swiotlb_max_segment to users") to i915_gem_object_get_pages_internal().
So limit the maximum page order to be used according to the maximum swiotlb segment size instead to the complete swiotlb size.
Signed-off-by: Juergen Gross jgross@suse.com
Please consider for 4.10 as otherwise 4.10 will be unusable as Xen dom0 with i915 graphics.
drivers/gpu/drm/i915/i915_gem_internal.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_internal.c b/drivers/gpu/drm/i915/i915_gem_internal.c index 4b3ff3e..d09c749 100644 --- a/drivers/gpu/drm/i915/i915_gem_internal.c +++ b/drivers/gpu/drm/i915/i915_gem_internal.c @@ -66,8 +66,16 @@ i915_gem_object_get_pages_internal(struct drm_i915_gem_object *obj)
max_order = MAX_ORDER; #ifdef CONFIG_SWIOTLB
- if (swiotlb_nr_tbl()) /* minimum max swiotlb size is IO_TLB_SEGSIZE */
max_order = min(max_order, ilog2(IO_TLB_SEGPAGES));
- if (swiotlb_nr_tbl()) {
unsigned int max_segment;max_segment = swiotlb_max_segment();if (max_segment) {max_segment = max_t(unsigned int, max_segment,PAGE_SIZE) >> PAGE_SHIFT;max_order = min(max_order, ilog2(max_segment));}- }
#endif
gfp = GFP_KERNEL | __GFP_HIGHMEM | __GFP_RECLAIMABLE;
Looks OK to me. We could bikeshed it to only use swiotlb_max_segment() which I think was the intention when that API was added but can leave that for the future.
Reviewed-by: Tvrtko Ursulin tvrtko.ursulin@intel.com
Regards,
Tvrtko