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 <[email protected]> --- 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; + dev_pm_domain_set(&pdev->dev, &pm_domain); pm_runtime_enable(&pdev->dev); pm_runtime_dont_use_autosuspend(&pdev->dev); -- 2.14.1 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
