dmaengine: bcm2835: Avoid accessing memory when copying zeroes

The BCM2835 DMA controller is capable of synthesizing zeroes instead of
copying them from a source address. The feature is enabled by setting
the SRC_IGNORE bit in the Transfer Information field of a Control Block:

"Do not perform source reads.
 In addition, destination writes will zero all the write strobes.
 This is used for fast cache fill operations."
https://www.raspberrypi.org/app/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

The feature is only available on 8 of the 16 channels. The others are
so-called "lite" channels with a limited feature set and performance.

Enable the feature if a cyclic transaction copies from the zero page.
This reduces traffic on the memory bus.

A forthcoming use case is the BCM2835 SPI driver, which will cyclically
copy from the zero page to the TX FIFO. The idea to use SRC_IGNORE was
taken from an ancient GitHub conversation between Martin and Noralf:
https://github.com/msperl/spi-bcm2835/issues/13#issuecomment-98180451

Tested-by: Nuno Sá <nuno.sa@analog.com>
Tested-by: Noralf Trønnes <noralf@tronnes.org>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Martin Sperl <kernel@martin.sperl.org>
Cc: Florian Kauer <florian.kauer@koalo.de>
Link: https://lore.kernel.org/r/b2286c904408745192e4beb3de3c88f73e4a7210.1568187525.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
index 14358fa..67100e4 100644 (file)
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -42,11 +42,14 @@
  * @ddev: DMA device
  * @base: base address of register map
  * @dma_parms: DMA parameters (to convey 1 GByte max segment size to clients)
+ * @zero_page: bus address of zero page (to detect transactions copying from
+ *     zero page and avoid accessing memory if so)
  */
 struct bcm2835_dmadev {
        struct dma_device ddev;
        void __iomem *base;
        struct device_dma_parameters dma_parms;
+       dma_addr_t zero_page;
 };
 
 struct bcm2835_dma_cb {
@@ -693,6 +696,7 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic(
        size_t period_len, enum dma_transfer_direction direction,
        unsigned long flags)
 {
+       struct bcm2835_dmadev *od = to_bcm2835_dma_dev(chan->device);
        struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
        struct bcm2835_desc *d;
        dma_addr_t src, dst;
@@ -743,6 +747,10 @@ static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic(
                dst = c->cfg.dst_addr;
                src = buf_addr;
                info |= BCM2835_DMA_D_DREQ | BCM2835_DMA_S_INC;
+
+               /* non-lite channels can write zeroes w/o accessing memory */
+               if (buf_addr == od->zero_page && !c->is_lite_channel)
+                       info |= BCM2835_DMA_S_IGNORE;
        }
 
        /* calculate number of frames */
@@ -845,6 +853,9 @@ static void bcm2835_dma_free(struct bcm2835_dmadev *od)
                list_del(&c->vc.chan.device_node);
                tasklet_kill(&c->vc.task);
        }
+
+       dma_unmap_page_attrs(od->ddev.dev, od->zero_page, PAGE_SIZE,
+                            DMA_TO_DEVICE, DMA_ATTR_SKIP_CPU_SYNC);
 }
 
 static const struct of_device_id bcm2835_dma_of_match[] = {
@@ -927,6 +938,14 @@ static int bcm2835_dma_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, od);
 
+       od->zero_page = dma_map_page_attrs(od->ddev.dev, ZERO_PAGE(0), 0,
+                                          PAGE_SIZE, DMA_TO_DEVICE,
+                                          DMA_ATTR_SKIP_CPU_SYNC);
+       if (dma_mapping_error(od->ddev.dev, od->zero_page)) {
+               dev_err(&pdev->dev, "Failed to map zero page\n");
+               return -ENOMEM;
+       }
+
        /* Request DMA channel mask from device tree */
        if (of_property_read_u32(pdev->dev.of_node,
                        "brcm,dma-channel-mask",