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Fri, 19 Jun 2020 10:37:09 +0000 (GMT) X-AuditID: cbfec7f4-677ff7000000176d-fa-5eec95557eb9 Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 03.1B.06017.5559CEE5; Fri, 19 Jun 2020 11:37:09 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200619103708eusmtip20f150a4cbcaa1a29d802f5e72289a3ee~Z66MCpa440111401114eusmtip2N; Fri, 19 Jun 2020 10:37:08 +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 v7 24/36] drm: xen: fix common struct sg_table related issues Date: Fri, 19 Jun 2020 12:36:24 +0200 Message-Id: <20200619103636.11974-25-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200619103636.11974-1-m.szyprowski@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrJKsWRmVeSWpSXmKPExsWy7djPc7qhU9/EGbTPVLPoPXeSyWLjjPWs Fv+3TWS2uPL1PZvFytVHmSwW7Le2+HLlIZPFpsfXWC0u75rDZrH2yF12iw+r37NaHPzwhNXi +5bJTA68HmvmrWH0uLN0J6PH3m8LWDy2f3vA6nG/+ziTx+Yl9R63/z1m9ph8Yzmjx+EPV1g8 dt9sYPPo27KK0ePzJrkAnigum5TUnMyy1CJ9uwSujL1d7UwFfXwV0y82MzYwvuXuYuTkkBAw kTjxYDFbFyMXh5DACkaJvmezWSCcL4wSTxZNZYdwPjNKbN1wCaiMA6zl5XVziPhyRolr736y gowC6/h0SBHEZhMwlOh628UGYosItDJKnOjlAWlgFvjBJHFu2Ql2kISwgL9Ew7+HjCBDWQRU JfZtlQEJ8wrYSXy5foMd4jx5idUbDjCD2JxA8dctB1kh4pfYJSZNlYGwXST6HjyHqheWeHV8 C5QtI3F6cg/YNxICzYwSD8+tZYdwehglLjfNYISospa4c+4X2GfMApoS63fpQ4QdJbbuOsoM 8TCfxI23giBhZiBz0rbpUGFeiY42IYhqNYlZx9fBrT144RIzhO0h0ToZ5ENQWE1klOhf/oB5 AqP8LIRlCxgZVzGKp5YW56anFhvlpZbrFSfmFpfmpesl5+duYgQmqNP/jn/ZwbjrT9IhRgEO RiUe3hchr+OEWBPLiitzDzFKcDArifA6nT0dJ8SbklhZlVqUH19UmpNafIhRmoNFSZzXeNHL WCGB9MSS1OzU1ILUIpgsEwenVANjH6doi+B3Ww2Tp/s6C3QZzxm8qjzYXvNOXWRum2pUd2/W zxS/t390RTPrts7KS1OLfrpMpK1Xa/fxTXlFDgosQtdv3Li98fSe6CzdmTxar1XltXWfJEs+ VDnxPmwZQ9VXyad+3c9LFv8tZ+jYnrakUe7r6RuMn+/ESby6LpegcZvxz1bD6eFKLMUZiYZa zEXFiQAV/hk2TAMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFprNIsWRmVeSWpSXmKPExsVy+t/xe7qhU9/EGRzs5rPoPXeSyWLjjPWs Fv+3TWS2uPL1PZvFytVHmSwW7Le2+HLlIZPFpsfXWC0u75rDZrH2yF12iw+r37NaHPzwhNXi +5bJTA68HmvmrWH0uLN0J6PH3m8LWDy2f3vA6nG/+ziTx+Yl9R63/z1m9ph8Yzmjx+EPV1g8 dt9sYPPo27KK0ePzJrkAnig9m6L80pJUhYz84hJbpWhDCyM9Q0sLPSMTSz1DY/NYKyNTJX07 m5TUnMyy1CJ9uwS9jL1d7UwFfXwV0y82MzYwvuXuYuTgkBAwkXh53byLkYtDSGApo8SHW9tY uhg5geIyEienNbBC2MISf651sYHYQgKfGCXOz2cGsdkEDCW63oLEuThEBDoZJaZ1f2QHcZgF /jFJnNi7nQmkSljAV+Lwmz2MINtYBFQl9m2VAQnzCthJfLl+gx1igbzE6g0HwIZyAsVftxxk hVhmK7F8wXvmCYx8CxgZVjGKpJYW56bnFhvpFSfmFpfmpesl5+duYgRGzLZjP7fsYOx6F3yI UYCDUYmH90XI6zgh1sSy4srcQ4wSHMxKIrxOZ0/HCfGmJFZWpRblxxeV5qQWH2I0BbppIrOU aHI+MJrzSuINTQ3NLSwNzY3Njc0slMR5OwQOxggJpCeWpGanphakFsH0MXFwSjUwlmusllia NLd7y62CFuePloqXituO9YR6/ZO6rzIt21juU8GFFSfZL/efrg2oSN8tMuGiU8KrcJn2FkUb gQf9M9+3Opyq+8+745SblW2lyrO6l009Fz4tftktE/BzpZfBkvCZy1WUK39+MTYv/OEwZe/v sqo3E1I2blmcn6KqqxvGx3K/5mKvEktxRqKhFnNRcSIAGXz7bK4CAAA= X-CMS-MailID: 20200619103709eucas1p12c32fa6377caf78e5dc28ce0ff51e7a0 X-Msg-Generator: CA X-RootMTR: 20200619103709eucas1p12c32fa6377caf78e5dc28ce0ff51e7a0 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103709eucas1p12c32fa6377caf78e5dc28ce0ff51e7a0 References: <20200619103636.11974-1-m.szyprowski@samsung.com> X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , 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 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" 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 f0b85e094111..ba4bdc5590ea 100644 --- a/drivers/gpu/drm/xen/xen_drm_front_gem.c +++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c @@ -215,7 +215,7 @@ 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; }