Git commit 90797e6d1ec0dfde6ba62a48b9ee3803887d6ed4 ("drm/i915: create compact dma scatter lists for gem objects") makes certain assumptions about the under laying DMA API that are not always correct.
On a ThinkPad X230 with an Intel HD 4000 with Xen during the bootup I see:
[drm:intel_pipe_set_base] *ERROR* pin & fence failed [drm:intel_crtc_set_config] *ERROR* failed to set mode on [CRTC:3], err = -28
Bit of debugging traced it down to dma_map_sg failing (in i915_gem_gtt_prepare_object) as some of the SG entries were huge (3MB).
That unfortunately are sizes that the SWIOTLB is incapable of handling - the maximum it can handle is a an entry of 512KB of virtual contiguous memory for its bounce buffer. (See IO_TLB_SEGSIZE).
Previous to the above mention git commit the SG entries were of 4KB, and the code introduced by above git commit squashed the CPU contiguous PFNs in one big virtual address provided to DMA API.
This patch is a simple semi-revert - were we emulate the old behavior if we detect that SWIOTLB is online. If it is not online then we continue on with the new compact scatter gather mechanism.
An alternative solution would be for the the '.get_pages' and the i915_gem_gtt_prepare_object to retry with smaller max gap of the amount of PFNs that can be combined together - but with this issue discovered during rc7 that might be too risky.
Reported-and-Tested-by: Konrad Rzeszutek Wilk konrad.wilk@oracle.com CC: Chris Wilson chris@chris-wilson.co.uk CC: Imre Deak imre.deak@intel.com CC: Daniel Vetter daniel.vetter@ffwll.ch CC: David Airlie airlied@linux.ie CC: dri-devel@lists.freedesktop.org Signed-off-by: Konrad Rzeszutek Wilk konrad.wilk@oracle.com --- drivers/gpu/drm/i915/i915_gem.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 970ad17..7045f45 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1801,7 +1801,14 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj) gfp |= __GFP_NORETRY | __GFP_NOWARN | __GFP_NO_KSWAPD; gfp &= ~(__GFP_IO | __GFP_WAIT); } - +#ifdef CONFIG_SWIOTLB + if (swiotlb_nr_tbl()) { + st->nents++; + sg_set_page(sg, page, PAGE_SIZE, 0); + sg = sg_next(sg); + continue; + } +#endif if (!i || page_to_pfn(page) != last_pfn + 1) { if (i) sg = sg_next(sg); @@ -1812,8 +1819,10 @@ i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj) } last_pfn = page_to_pfn(page); } - - sg_mark_end(sg); +#ifdef CONFIG_SWIOTLB + if (!swiotlb_nr_tbl()) +#endif + sg_mark_end(sg); obj->pages = st;
if (i915_gem_object_needs_bit17_swizzle(obj))