From b5891fb520f742ce48b097c6b8a0b2db1e2bb979 Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 14 Sep 2017 17:22:40 +0100 Subject: [PATCH] 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 Link: https://patchwork.freedesktop.org/patch/msgid/20170914162240.18310-1-chris@chris-wilson.co.uk Tested-by: Elizabeth De La Torre Mena Reviewed-by: Matthew Auld 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); -- GitLab