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drm/i915/selftests: Disable iommu for the mock device

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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 <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20170914162240.18310-1-chris@chris-wilson.co.uk
Tested-by: Elizabeth De La Torre Mena <elizabethx.de.la.torre.mena@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com
This commit is contained in:
Chris Wilson 2017-09-14 17:22:40 +01:00
parent 1298d51c44
commit b5891fb520
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/selftests/mock_gem_device.c
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@ -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);