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Fri, 4 Sep 2020 13:35:05 +0000 (GMT) From: Marek Szyprowski To: dri-devel@lists.freedesktop.org, iommu@lists.linux-foundation.org, linaro-mm-sig@lists.linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH v10 21/30] drm: xen: fix common struct sg_table related issues Date: Fri, 4 Sep 2020 15:17:02 +0200 Message-Id: <20200904131711.12950-22-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200904131711.12950-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA0WSfSxVcRjH+51zz73HzbHTJX5RsbvVqg0Zf5zlTrHWzj9tprU2ltvFCcWl e1DMMMrL9TJiCIuFvFO6EUrIa3IZMm8NsRnztrwU85LTQf99n8/3++x59uzBUUkDZox7KwMY lVLhIxWKBTXtm73magcn+eXGCksqUduFUG8zqzBqryYFpQbXl4VUSVkbQuV9tqXWBqcQqnp6 CKMG6nOEVEXrDxG1UraMUc0rMxj1W5OKXCPo8pflgB4vrAP0p408AV27MYnRE/EdCP2uIJwe 251G6dThIkB/WRkU0A0jEUI6SVMK6NXqs466zmKZB+PjHcSoLO3uib1yS9uBf5Lek5jdcRAB Fo+rgQ4OSRuYtLAiUgMxLiGLAVztTBbwxRqA9W2jKF+sApi29wI5bEkYikZ4owjAzZwicNRS 3b8LuJSQtILqRbWQ0wbkMwA7E3W5EEr+QaD2daeIM/RJR7gW24SpAY4LyHMwr8eDwwRpB0uK p0T8NFNY9qYJ5bTOPn+fOYPxXCuC6RsyXl+HE0sLB3l9ON+hOdCn4V5d7r9NIRkF4JS2QsQX CQAORGYCPmULx7VbQm4JlLwIq+oteWwP4yNrBByGpB4cXjzBYXRfPq/JQHlMwNhoCZ8+D7M6 Ko/GNvf1o7ymYUll/8FJU/bPMLEpSgamWf+H5QFQCoyYQNbXk2GtlcxjC1bhywYqPS3c/Xyr wf5Lde92rH8AjdtuLYDEgVSXOHbVSS7BFEFssG8LgDgqNSAcerpdJYSHIjiEUfnJVYE+DNsC THCB1IiwfjV3V0J6KgKYhwzjz6gOXQTXMY4AITvu2XoDGtd58/xbUbRh3Pf0EKMLJz+2C0+F a9c2escXikeXXB4k22blGzWa6c3P0cTtgZ4r2yOzoTfCCsesSqU7X72UT+8vnXG702RmUtn1 KzotTGa4VTApaw1KrmD7bL45yzJu/oyTx+S7aOxDzQ2JbNnmbKshVe82XSsXP5IKWC+F1SVU xSr+AqiFDBtOAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprLIsWRmVeSWpSXmKPExsVy+t/xu7pdTkHxBse3S1j0njvJZLFxxnpW i//bJjJbXPn6ns1i5eqjTBYL9ltbfLnykMli0+NrrBaXd81hs1h75C67xYfV71ktDn54wmrx fctkJgdejzXz1jB63Fm6k9Fj77cFLB7bvz1g9bjffZzJY/OSeo/b/x4ze0y+sZzR4/CHKywe u282sHn0bVnF6PF5k1wAT5SeTVF+aUmqQkZ+cYmtUrShhZGeoaWFnpGJpZ6hsXmslZGpkr6d TUpqTmZZapG+XYJexvxVxxgL+vgq2v/dYWxgfMvdxcjJISFgItFzrY2pi5GLQ0hgKaNEX+MU NoiEjMTJaQ2sELawxJ9rXWwQRZ8YJfY0PmcBSbAJGEp0vYVIiAh0MkpM6/7IDuIwC/xjkjix dzsTSJWwgJ/E1u9XGbsYOThYBFQlFpxNAQnzCthJrFzxkB1ig7zE6g0HmEFsTqD41hlPwDYL CdhKfJizmGUCI98CRoZVjCKppcW56bnFRnrFibnFpXnpesn5uZsYgVGz7djPLTsYu94FH2IU 4GBU4uFlsA+KF2JNLCuuzD3EKMHBrCTC63T2dJwQb0piZVVqUX58UWlOavEhRlOgmyYyS4km 5wMjOq8k3tDU0NzC0tDc2NzYzEJJnLdD4GCMkEB6YklqdmpqQWoRTB8TB6dUA6NZYzFDSrT+ zEYH20lhl1sVs9t9z81h2F3m6iVk8K3lgOffF6wS1WH3/t2Pn5H8mKPzesEVxdblAt2tPhqM UmZcT1V2b+T4dmKebaoJm6mZi98WBTX1ZcmFMh/O/edUiS8/v7z+0Ml9P1p/fdsk/2ReqVTa kYvJOZf7vA9XtsqpFLx7u//+ESWW4oxEQy3mouJEAH4u/TOwAgAA X-CMS-MailID: 20200904133506eucas1p170dd4d393f12bf79c9ba4a3c9532c29f X-Msg-Generator: CA X-RootMTR: 20200904133506eucas1p170dd4d393f12bf79c9ba4a3c9532c29f X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200904133506eucas1p170dd4d393f12bf79c9ba4a3c9532c29f References: <20200904131711.12950-1-m.szyprowski@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200904_093508_620703_B9622D3D X-CRM114-Status: GOOD ( 18.88 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [210.118.77.11 listed in wl.mailspike.net] -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [210.118.77.11 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bartlomiej Zolnierkiewicz , David Airlie , Oleksandr Andrushchenko , Daniel Vetter , xen-devel@lists.xenproject.org, Robin Murphy , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The Documentation/DMA-API-HOWTO.txt states that the dma_map_sg() function returns the number of the created entries in the DMA address space. However the subsequent calls to the dma_sync_sg_for_{device,cpu}() and dma_unmap_sg must be called with the original number of the entries passed to the dma_map_sg(). struct sg_table is a common structure used for describing a non-contiguous memory buffer, used commonly in the DRM and graphics subsystems. It consists of a scatterlist with memory pages and DMA addresses (sgl entry), as well as the number of scatterlist entries: CPU pages (orig_nents entry) and DMA mapped pages (nents entry). It turned out that it was a common mistake to misuse nents and orig_nents entries, calling DMA-mapping functions with a wrong number of entries or ignoring the number of mapped entries returned by the dma_map_sg() function. Fix the code to refer to proper nents or orig_nents entries. This driver reports the number of the pages in the imported scatterlist, so it should refer to sg_table->orig_nents entry. Signed-off-by: Marek Szyprowski Acked-by: Oleksandr Andrushchenko --- drivers/gpu/drm/xen/xen_drm_front_gem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c index 39ff95b75357..0e57c80058b2 100644 --- a/drivers/gpu/drm/xen/xen_drm_front_gem.c +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c @@ -216,7 +216,7 @@ xen_drm_front_gem_import_sg_table(struct drm_device *dev, return ERR_PTR(ret); DRM_DEBUG("Imported buffer of size %zu with nents %u\n", - size, sgt->nents); + size, sgt->orig_nents); return &xen_obj->base; }