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

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

diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index 6787234..38ed006 100644 (file)
--- 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);