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Fri, 24 May 2024 11:27:57 -0700 (PDT) X-Relaying-Domain: raspberrypi.com From: Dave Stevenson To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden , Vinod Koul , Maxime Ripard , Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Ulf Hansson , Mark Brown , Christoph Hellwig , Marek Szyprowski , Robin Murphy , Liam Girdwood , Jaroslav Kysela , Takashi Iwai , Vladimir Murzin , Phil Elwell , Stefan Wahren , Serge Semin Cc: devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mmc@vger.kernel.org, linux-spi@vger.kernel.org, iommu@lists.linux.dev, linux-sound@vger.kernel.org, Dave Stevenson Subject: [PATCH 11/18] dmaengine: bcm2835: Use dma_map_resource to map addresses Date: Fri, 24 May 2024 19:26:55 +0100 Message-Id: <20240524182702.1317935-12-dave.stevenson@raspberrypi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240524182702.1317935-1-dave.stevenson@raspberrypi.com> References: <20240524182702.1317935-1-dave.stevenson@raspberrypi.com> MIME-Version: 1.0 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" There is a need to account for dma-ranges and iommus in the dma mapping process, and the public API for handling that is dma_map_resource. Add support for mapping addresses to the DMA driver. Signed-off-by: Dave Stevenson --- drivers/dma/bcm2835-dma.c | 46 ++++++++++++++++++++++++++++++++++----- 1 file changed, 41 insertions(+), 5 deletions(-) diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 9531c0b82071..e48008b06716 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -67,6 +67,10 @@ struct bcm2835_cb_entry { struct bcm2835_dma_chan_map { dma_addr_t addr; + enum dma_data_direction dir; + + phys_addr_t slave_addr; + unsigned int xfer_size; }; struct bcm2835_chan { @@ -294,12 +298,44 @@ static int bcm2835_dma_map_slave_addr(struct dma_chan *chan, return 0; } - /* - * This path will be updated to handle new clients, but currently should - * never be used. - */ + if (dev_size != DMA_SLAVE_BUSWIDTH_4_BYTES) + return -EIO; + + /* Reuse current map if possible. */ + if (dev_addr == map->slave_addr && + dev_size == map->xfer_size && + dev_dir == map->dir) + return 0; + + /* Remove old mapping if present. */ + if (map->xfer_size) { + dev_dbg(chan->device->dev, "chan: unmap %zx@%pap to %pad dir: %s\n", + dev_size, &dev_addr, &map->addr, + dev_dir == DMA_TO_DEVICE ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE"); + dma_unmap_resource(chan->device->dev, map->addr, + map->xfer_size, map->dir, 0); + } + map->xfer_size = 0; - return -EINVAL; + /* Create new slave address map. */ + map->addr = dma_map_resource(chan->device->dev, dev_addr, dev_size, + dev_dir, 0); + + if (dma_mapping_error(chan->device->dev, map->addr)) { + dev_err(chan->device->dev, "chan: failed to map %zx@%pap", + dev_size, &dev_addr); + return -EIO; + } + + dev_dbg(chan->device->dev, "chan: map %zx@%pap to %pad dir: %s\n", + dev_size, &dev_addr, &map->addr, + dev_dir == DMA_TO_DEVICE ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE"); + + map->slave_addr = dev_addr; + map->xfer_size = dev_size; + map->dir = dev_dir; + + return 0; } static void bcm2835_dma_free_cb_chain(struct bcm2835_desc *desc)