From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 70F44C43458 for ; Fri, 3 Jul 2026 06:35:29 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id CD1F710F64F; Fri, 3 Jul 2026 06:35:28 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="jV/mu9zH"; dkim-atps=neutral Received: from mail-wr1-f45.google.com (mail-wr1-f45.google.com [209.85.221.45]) by gabe.freedesktop.org (Postfix) with ESMTPS id 37BCF10F64F for ; Fri, 3 Jul 2026 06:35:28 +0000 (UTC) Received: by mail-wr1-f45.google.com with SMTP id ffacd0b85a97d-461edb387ddso218053f8f.3 for ; Thu, 02 Jul 2026 23:35:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1783060526; x=1783665326; darn=lists.freedesktop.org; h=content-transfer-encoding:content-type:mime-version:message-id:date :subject:cc:to:from:from:to:cc:subject:date:message-id:reply-to :content-type; bh=5nzq7a1ESEwR4QVo1d/CJQNhFbIp6HJBMyLysl2f+yo=; b=jV/mu9zHadQ69odLX1OcjJ+P6uQWLh7lJnnsGUQ3PP0sCPko0b7IOP5Wrdfzc5bs4V JgPGFWMqK1Xss9xDeDRMH8+woYm46SC+0xIHMbMcPmLZs396q6h3TjzRY+84fQD1Lbx+ 207jmd0TJrclNIi7qWH8ojL36CcY6kf0gi+s7zjy0lloNVjs0b3m81jFBMrYzIuqdenU U3NNydOSOBuhE3vR8nw5+Fikrcwqo33vI7WETvNZCQxeDj8kFa2tNQVCFj/jtIuNJjDn 9jbWbVNZ6yTHb05autYjzmbg52yvo9ewfyvPYy74NkZWcQ0X6uKT8++oworo8ULsH7vL 38fA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783060526; x=1783665326; h=content-transfer-encoding:content-type:mime-version:message-id:date :subject:cc:to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to:content-type; bh=5nzq7a1ESEwR4QVo1d/CJQNhFbIp6HJBMyLysl2f+yo=; b=Ty2PLEbfYxjsw6ddnn14jWouSWjKNov3JVtrNBmxtwHTxZz5yuDIGi1s3ZCRVoRfCO Tm/A6KqWwSXaJMFYO96qDkZIrifg8fu1wUHaJKtFVC+ov8TSzjSLcRs77xZzDgoHxGKY zluQWD1FnwNI5ocld8t/mWc+t4T/fZComIO797aTd+tbKDpoTdYZEZzA7tt60AnKKXX5 KDlvA0fe8qte+Ro2hI8m+6s5oDZYZtQACpYbrPliznti+aEnssBbtbceWThoQ37qOxjK nItYl+ZK6FJq/RgDdP2ErCwn5icoeYUuCpY2hr56BUaH/BMZDxKzmG9rYw/cHOUoQE66 JxeA== X-Gm-Message-State: AOJu0Yxd2CXZMGz/9Xle/Cjf4QFvIyrBUsq1kab+nyM71vHKvEXgLGZP BIdgxka0+KGXLmTc6A64g6spFFSFzYTuMy5w2fIj1DEvk4n7rXYcRQTpLzHATw== X-Gm-Gg: AfdE7cmALrSnPMk2WNXnSLz04FCKBgWws/5oKHDSNv6RGBLK9m9S0XIxAWmayup/Ty5 rNcRLYPB+RyZr+awzBNegOuilYsKWQQKqqkpgPoSUu7rnCR/0FIG9wrqOr2l01OD24pmTw1kOzF nR6aeCDHxsgb7vv5uU8NYkanOaOemMUIuXKDk9YfVI1Owvrx2To8AMUCbng6duKhrmEbm6jYC/O Luk1QoBU5aWP+VhWjWUniapWfndddSge/zcQLs8hF/z+URGOVXl+Qh0v2DC7wjU9fglPKa57Yj9 U6v2vvq4YGybjZCnJQA6wK7HigRtHvjzAgabbSwTg1SU/1QbLTLbZIEv50oY9ltTx8hc64fZdVG 3xJmIsDgwqdTrcwPPUSUHxgBYqW6KE92dCwmKDcCuid50/5iJslDkXSHu2+rardQzXWo3kqXYre LnMHxo7G4YFqX6jYy3HAFGQw== X-Received: by 2002:a05:6000:2c0d:b0:476:cfa0:a976 with SMTP id ffacd0b85a97d-477aeb5c312mr12493355f8f.5.1783060526376; 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 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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