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Fri, 19 Jun 2020 10:36:53 +0000 (GMT) X-AuditID: cbfec7f4-677ff7000000176d-cc-5eec954560c6 Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 1E.FA.06017.5459CEE5; Fri, 19 Jun 2020 11:36:53 +0100 (BST) Received: from AMDC2765.digital.local (unknown [106.120.51.73]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20200619103652eusmtip2208c0c7093c1b30d8d3abf29423a32dd~Z659cWTey0246802468eusmtip2d; Fri, 19 Jun 2020 10:36:52 +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 01/36] drm: prime: add common helper to check scatterlist contiguity Date: Fri, 19 Jun 2020 12:36:01 +0200 Message-Id: <20200619103636.11974-2-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: H4sIAAAAAAAAA0VSeUhTYQDve9eew8nzKe3LonBQkaF2GDwx7aDkkRWJURRorXxp5JbuqWUH WpumS6PltaJ0RWTN1DxaolhtlMtGo1JSy+hYh6Z2zQ4rNV8v67/f+f0+Pj4SpW/hfuROdSqn USuTFIQUs7QOOwMjiwfi5pVoAVPgbEOYWmMNzoxZDCjT8eUDwVyqvI0wphthzFDHC4Spcz3C mfam0wRTdeuphDn76SrG5ORdwBnrx1c40zBgwJd6sZfLLgO25asJY+vMeQR77etznC1ri2af HbUjbP35TPbJqAtlC7sqANvcnUWwxxrMgK137GfdddPXyTZLF8dzSTvTOU1wxFZp4rOiJiS5 cepeR+kHJAvcnqwHHiSkQqBudATogZSkqYsAPno7IhHJEIDdT7owkbgBdHTeRCYqr78dR0Wj AsCS3uvEv8qLs7m4kCKo+VA/qCcE7EtlA3inwFMIoZQJhcPuHCAYPtQmqK9x/Slg1Ex4pi1r fJwkZVQ4rLorF9dmwMorN1EBe1ARsF9nxYVzIPVYAnM+t0rE0ApoHPtOiNgHvrM3/NWnQUdh PiYWtOO3c1ZJRJIPYPthIxBTYbDH+YMQllFqDqxpChblZfCB7R4uyJDygl2D3oKMjsMTllJU lGUwN4cW07PgKXv1v1nr/YeoiFlYWGzExQcyADh4xEAcBzNO/R8zAWAGci6NVyVw/AI1tyeI V6r4NHVC0Pbdqjow/rcco/ahRtD0a5sNUCRQeMp61/fH0bgync9Q2QAkUYWvbPk9Rxwti1dm 7OM0u7do0pI43gamkphCLlt4ri+WphKUqdwujkvmNBMuQnr4ZYHkTp9YT0YXsdKdjdcHVIOi PELuX5v6M9DqquTo8pUeXcXoarVEao1hQumF/t3NG74/jJ7S0v7qvC7fsgTjqLmrzJne8p7M KOOi8sUxKdr0l2b3sUlglmHdoU06kz1KtfEk7FuTopE6D6xtJ4tCG2lt+JvZIe/XHizbEdkT osD4ROX8AFTDK38DH1qgtlcDAAA= X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrKIsWRmVeSWpSXmKPExsVy+t/xe7quU9/EGRx+p2zRe+4kk8XGGetZ Lf5vm8hsceXrezaLlauPMlks2G9t8eXKQyaLTY+vsVpc3jWHzWLtkbvsFgs/bmWxaOtcxmpx 8MMTVostbyayOvB5rJm3htFj77cFLB6bVnWyeWz/9oDVY97JQI/73ceZPDYvqfe4/e8xs8fk G8sZPXbfbGDz6NuyitFj8+lqj8+b5AJ4o/RsivJLS1IVMvKLS2yVog0tjPQMLS30jEws9QyN zWOtjEyV9O1sUlJzMstSi/TtEvQy7k/ZxVSwQ7ri9PT3TA2MR8W6GDk5JARMJJ5+n8DcxcjF ISSwlFFi7ew1rBAJGYmT0xqgbGGJP9e62CCKPjFK7JxynQkkwSZgKNH1FiIhItDJKDGt+yM7 iMMssIJZ4tW+uSwgVcIC4RJ98xsZQWwWAVWJuScbgIo4OHgFbCXWnhKH2CAvsXrDAWYQm1PA TuJ1y0GwzUJAJcsXvGeewMi3gJFhFaNIamlxbnpusZFecWJucWleul5yfu4mRmAUbTv2c8sO xq53wYcYBTgYlXh4X4S8jhNiTSwrrsw9xCjBwawkwut09nScEG9KYmVValF+fFFpTmrxIUZT oJsmMkuJJucDIzyvJN7Q1NDcwtLQ3Njc2MxCSZy3Q+BgjJBAemJJanZqakFqEUwfEwenVAOj lEG7RnH0r5br5meqU2ee+yl7Ovz24beN+46sc11zfe5aRs8Q3WfPyjPP6lzNVlFhfjbxdyyr 5zbTmkcTnyye7uMy077Qo9JE974Ke/CyH2xz8zxLN22aq7+o5b7EAne+j+uM9u9/2nq/5OIv 3hfFTjXxhQXqPLIaugpuu+6sc7hWrrTvbF2NEktxRqKhFnNRcSIAzwAV7rgCAAA= X-CMS-MailID: 20200619103653eucas1p2542a7f42db61b22a43919666368dbbfa X-Msg-Generator: CA X-RootMTR: 20200619103653eucas1p2542a7f42db61b22a43919666368dbbfa X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20200619103653eucas1p2542a7f42db61b22a43919666368dbbfa References: <20200619103636.11974-1-m.szyprowski@samsung.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200619_033657_339188_4751D354 X-CRM114-Status: GOOD ( 19.10 ) 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: Thomas Zimmermann , Bartlomiej Zolnierkiewicz , David Airlie , Maarten Lankhorst , Maxime Ripard , Daniel Vetter , Robin Murphy , Christoph Hellwig , linux-arm-kernel@lists.infradead.org, Marek Szyprowski MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org It is a common operation done by DRM drivers to check the contiguity of the DMA-mapped buffer described by a scatterlist in the sg_table object. Let's add a common helper for this operation. Signed-off-by: Marek Szyprowski --- drivers/gpu/drm/drm_gem_cma_helper.c | 23 +++------------------ drivers/gpu/drm/drm_prime.c | 31 ++++++++++++++++++++++++++++ include/drm/drm_prime.h | 2 ++ 3 files changed, 36 insertions(+), 20 deletions(-) diff --git a/drivers/gpu/drm/drm_gem_cma_helper.c b/drivers/gpu/drm/drm_gem_cma_helper.c index 06a5b9ee1fe0..41566a15dabd 100644 --- a/drivers/gpu/drm/drm_gem_cma_helper.c +++ b/drivers/gpu/drm/drm_gem_cma_helper.c @@ -471,26 +471,9 @@ drm_gem_cma_prime_import_sg_table(struct drm_device *dev, { struct drm_gem_cma_object *cma_obj; - if (sgt->nents != 1) { - /* check if the entries in the sg_table are contiguous */ - dma_addr_t next_addr = sg_dma_address(sgt->sgl); - struct scatterlist *s; - unsigned int i; - - for_each_sg(sgt->sgl, s, sgt->nents, i) { - /* - * sg_dma_address(s) is only valid for entries - * that have sg_dma_len(s) != 0 - */ - if (!sg_dma_len(s)) - continue; - - if (sg_dma_address(s) != next_addr) - return ERR_PTR(-EINVAL); - - next_addr = sg_dma_address(s) + sg_dma_len(s); - } - } + /* check if the entries in the sg_table are contiguous */ + if (drm_prime_get_contiguous_size(sgt) < attach->dmabuf->size) + return ERR_PTR(-EINVAL); /* Create a CMA GEM buffer. */ cma_obj = __drm_gem_cma_create(dev, attach->dmabuf->size); diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index bbfc713bfdc3..226cd6ad3985 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -825,6 +825,37 @@ struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_page } EXPORT_SYMBOL(drm_prime_pages_to_sg); +/** + * drm_prime_get_contiguous_size - returns the contiguous size of the buffer + * @sgt: sg_table describing the buffer to check + * + * This helper calculates the contiguous size in the DMA address space + * of the the buffer described by the provided sg_table. + * + * This is useful for implementing + * &drm_gem_object_funcs.gem_prime_import_sg_table. + */ +unsigned long drm_prime_get_contiguous_size(struct sg_table *sgt) +{ + dma_addr_t expected = sg_dma_address(sgt->sgl); + struct scatterlist *sg; + unsigned long size = 0; + int i; + + for_each_sgtable_dma_sg(sgt, sg, i) { + unsigned int len = sg_dma_len(sg); + + if (!len) + break; + if (sg_dma_address(sg) != expected) + break; + expected += len; + size += len; + } + return size; +} +EXPORT_SYMBOL(drm_prime_get_contiguous_size); + /** * drm_gem_prime_export - helper library implementation of the export callback * @obj: GEM object to export diff --git a/include/drm/drm_prime.h b/include/drm/drm_prime.h index 9af7422b44cf..47ef11614627 100644 --- a/include/drm/drm_prime.h +++ b/include/drm/drm_prime.h @@ -92,6 +92,8 @@ struct sg_table *drm_prime_pages_to_sg(struct page **pages, unsigned int nr_page struct dma_buf *drm_gem_prime_export(struct drm_gem_object *obj, int flags); +unsigned long drm_prime_get_contiguous_size(struct sg_table *sgt); + /* helper functions for importing */ struct drm_gem_object *drm_gem_prime_import_dev(struct drm_device *dev, struct dma_buf *dma_buf, -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel