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Thu, 02 Jul 2026 23:35:26 -0700 (PDT) Received: from fedora ([94.73.45.171]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-477db3dba3csm14687656f8f.3.2026.07.02.23.35.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 02 Jul 2026 23:35:26 -0700 (PDT) From: =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= To: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, boris.brezillon@collabora.com, kees@kernel.org, =?UTF-8?q?Jos=C3=A9=20Exp=C3=B3sito?= Subject: [PATCH 0/2] drm/tests: shmem: Fix intermittent DMA overflow on ppc64le/s390x Date: Fri, 3 Jul 2026 08:34:25 +0200 Message-ID: <20260703063517.6346-1-jose.exposito89@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Two drm_gem_shmem KUnit tests, drm_gem_shmem_test_get_pages_sgt() and drm_gem_shmem_test_purge(), intermittently fail on ppc64le and s390x CI with a DMA address overflow warning followed by -EIO: DMA addr 0x00000001130b0000+65536 overflow (mask ffffffff, bus limit 0). Expected sgt is not error, but is: -5 Both tests call `drm_gem_shmem_get_pages_sgt()`, which internally pins backing pages and DMA-maps them via `dma_map_sgtable()`. The DMA mapping path is: drm_gem_shmem_test_purge() drm_gem_shmem_get_pages_sgt() drm_gem_shmem_get_pages_sgt_locked() [drm_gem_shmem_helper.c] dma_map_sgtable() [mapping.c] __dma_map_sg_attrs() dma_direct_map_sg() [direct.c] dma_direct_map_phys() [kernel/dma/direct.h] dma_capable() Checks addr against DMA mask -> FAILS: addr > 0xFFFFFFFF KUnit devices are initialized with a 32-bit DMA mask (`DMA_BIT_MASK(32)`) in `lib/kunit/device.c`. On systems where the kernel allocates backing pages at physical addresses above 4GB, `dma_capable()` returns false because the address exceeds the 32-bit mask. The `dma_set_mask()` function updates `*dev->dma_mask` to the given value; setting it to `DMA_BIT_MASK(64)` allows any physical address to pass the check. The failure is intermittent because pages may or may not be allocated above 4GB on any given run depend on memory pressure. A third test in the same suite, `drm_gem_shmem_test_obj_create_private`, already calls `dma_set_mask(drm_dev->dev, DMA_BIT_MASK(64))` before its DMA mapping. This series applies the same fix to the two remaining tests. José Expósito (2): drm/tests: shmem: Set DMA mask to 64-bit in drm_gem_shmem_test_get_pages_sgt drm/tests: shmem: Set DMA mask to 64-bit in drm_gem_shmem_test_purge drivers/gpu/drm/tests/drm_gem_shmem_test.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) -- 2.54.0