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[217.31.164.171]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a89892232c7sm178026866b.222.2024.08.30.00.04.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Aug 2024 00:04:36 -0700 (PDT) From: Jens Wiklander To: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, op-tee@lists.trustedfirmware.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: Olivier Masse , Thierry Reding , Yong Wu , Sumit Semwal , Benjamin Gaignard , Brian Starkey , John Stultz , "T . J . Mercier" , =?utf-8?q?Christian_K=C3=B6nig?= , Sumit Garg , Matthias Brugger , AngeloGioacchino Del Regno , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jens Wiklander Subject: [RFC PATCH 1/4] dma-buf: heaps: restricted_heap: add no_map attribute Date: Fri, 30 Aug 2024 09:03:48 +0200 Message-Id: <20240830070351.2855919-2-jens.wiklander@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240830070351.2855919-1-jens.wiklander@linaro.org> References: <20240830070351.2855919-1-jens.wiklander@linaro.org> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Add a no_map attribute to struct restricted_heap_attachment and struct restricted_heap to skip the call to dma_map_sgtable() if set. This avoids trying to map a dma-buf that doens't refer to memory accessible by the kernel. Signed-off-by: Jens Wiklander --- drivers/dma-buf/heaps/restricted_heap.c | 17 +++++++++++++---- drivers/dma-buf/heaps/restricted_heap.h | 2 ++ 2 files changed, 15 insertions(+), 4 deletions(-) diff --git a/drivers/dma-buf/heaps/restricted_heap.c b/drivers/dma-buf/heaps/restricted_heap.c index 8bc8a5e3f969..4bf28e3727ca 100644 --- a/drivers/dma-buf/heaps/restricted_heap.c +++ b/drivers/dma-buf/heaps/restricted_heap.c @@ -16,6 +16,7 @@ struct restricted_heap_attachment { struct sg_table *table; struct device *dev; + bool no_map; }; static int @@ -54,6 +55,8 @@ restricted_heap_memory_free(struct restricted_heap *rheap, struct restricted_buf static int restricted_heap_attach(struct dma_buf *dmabuf, struct dma_buf_attachment *attachment) { struct restricted_buffer *restricted_buf = dmabuf->priv; + struct dma_heap *heap = restricted_buf->heap; + struct restricted_heap *rheap = dma_heap_get_drvdata(heap); struct restricted_heap_attachment *a; struct sg_table *table; @@ -70,6 +73,7 @@ static int restricted_heap_attach(struct dma_buf *dmabuf, struct dma_buf_attachm sg_dma_mark_restricted(table->sgl); a->table = table; a->dev = attachment->dev; + a->no_map = rheap->no_map; attachment->priv = a; return 0; @@ -92,9 +96,12 @@ restricted_heap_map_dma_buf(struct dma_buf_attachment *attachment, struct sg_table *table = a->table; int ret; - ret = dma_map_sgtable(attachment->dev, table, direction, DMA_ATTR_SKIP_CPU_SYNC); - if (ret) - return ERR_PTR(ret); + if (!a->no_map) { + ret = dma_map_sgtable(attachment->dev, table, direction, + DMA_ATTR_SKIP_CPU_SYNC); + if (ret) + return ERR_PTR(ret); + } return table; } @@ -106,7 +113,9 @@ restricted_heap_unmap_dma_buf(struct dma_buf_attachment *attachment, struct sg_t WARN_ON(a->table != table); - dma_unmap_sgtable(attachment->dev, table, direction, DMA_ATTR_SKIP_CPU_SYNC); + if (!a->no_map) + dma_unmap_sgtable(attachment->dev, table, direction, + DMA_ATTR_SKIP_CPU_SYNC); } static int diff --git a/drivers/dma-buf/heaps/restricted_heap.h b/drivers/dma-buf/heaps/restricted_heap.h index 7dec4b8a471b..94cc0842f70d 100644 --- a/drivers/dma-buf/heaps/restricted_heap.h +++ b/drivers/dma-buf/heaps/restricted_heap.h @@ -27,6 +27,8 @@ struct restricted_heap { unsigned long cma_paddr; unsigned long cma_size; + bool no_map; + void *priv_data; };