Quoting Chris Wilson (2017-09-14 17:22:40) > On some machines, the iommu cannot allocate a domain for the mock device > causing the dma_map_sg() to fail, and the selftest to fail with -ENOMEM. > For the mock selftests, we are using a fake device and do not care about > iommu; so convince intel_iommu to treat us as a dummy device with an > identity mapping (and no iommu domain). > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101080 > Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk> > --- > drivers/gpu/drm/i915/selftests/mock_gem_device.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c > b/drivers/gpu/drm/i915/selftests/mock_gem_device.c > index 678723430d78..38ed006be5be 100644 > --- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c > +++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c > @@ -146,6 +146,9 @@ struct drm_i915_private *mock_gem_device(void) > dev_set_name(&pdev->dev, "mock"); > dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); > > + /* hack to disable iommu for the fake device; force identity mapping > */ > + pdev->dev.archdata.iommu = (void *)-1;
Drat, and now having pushed it to a wider set of machines, that tells me that archdata.iommu only exists under CONFIG_INTEL_IOMMU -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
