linux-kernel - [PATCH 13/18] 53c700: convert to dma_alloc

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Date:   Tue, 15 Sep 2020 17:51:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Matt Porter <mporter@...nel.crashing.org>,
        iommu@...ts.linux-foundation.org
Cc:     Stefan Richter <stefanr@...6.in-berlin.de>,
        linux1394-devel@...ts.sourceforge.net, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        nouveau@...ts.freedesktop.org, netdev@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-mm@...ck.org,
        alsa-devel@...a-project.org
Subject: [PATCH 13/18] 53c700: convert to dma_alloc_noncoherent

Use the new non-coherent DMA API including proper ownership transfers.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/scsi/53c700.c | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c
index c59226d7e2f6b5..5117d90ccd9edf 100644
--- a/drivers/scsi/53c700.c
+++ b/drivers/scsi/53c700.c
@@ -269,18 +269,25 @@ NCR_700_get_SXFER(struct scsi_device *SDp)
 					      spi_period(SDp->sdev_target));
 }
 
+static inline dma_addr_t virt_to_dma(struct NCR_700_Host_Parameters *h, void *p)
+{
+	return h->pScript + ((uintptr_t)p - (uintptr_t)h->script);
+}
+
 static inline void dma_sync_to_dev(struct NCR_700_Host_Parameters *h,
 		void *addr, size_t size)
 {
 	if (h->noncoherent)
-		dma_cache_sync(h->dev, addr, size, DMA_TO_DEVICE);
+		dma_sync_single_for_device(h->dev, virt_to_dma(h, addr),
+					   size, DMA_BIDIRECTIONAL);
 }
 
 static inline void dma_sync_from_dev(struct NCR_700_Host_Parameters *h,
 		void *addr, size_t size)
 {
 	if (h->noncoherent)
-		dma_cache_sync(h->dev, addr, size, DMA_FROM_DEVICE);
+		dma_sync_single_for_device(h->dev, virt_to_dma(h, addr), size,
+					   DMA_BIDIRECTIONAL);
 }
 
 struct Scsi_Host *
@@ -300,8 +307,8 @@ NCR_700_detect(struct scsi_host_template *tpnt,
 	memory = dma_alloc_coherent(dev, TOTAL_MEM_SIZE, &pScript, GFP_KERNEL);
 	if (!memory) {
 		hostdata->noncoherent = 1;
-		memory = dma_alloc_attrs(dev, TOTAL_MEM_SIZE, &pScript,
-					 GFP_KERNEL, DMA_ATTR_NON_CONSISTENT);
+		memory = dma_alloc_noncoherent(dev, TOTAL_MEM_SIZE, &pScript,
+					 DMA_BIDIRECTIONAL, GFP_KERNEL);
 	}
 	if (!memory) {
 		printk(KERN_ERR "53c700: Failed to allocate memory for driver, detaching\n");
@@ -414,8 +421,9 @@ NCR_700_release(struct Scsi_Host *host)
 		(struct NCR_700_Host_Parameters *)host->hostdata[0];
 
 	if (hostdata->noncoherent)
-		dma_free_attrs(hostdata->dev, TOTAL_MEM_SIZE, hostdata->script,
-			       hostdata->pScript, DMA_ATTR_NON_CONSISTENT);
+		dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
+				hostdata->script, hostdata->pScript,
+				DMA_BIDIRECTIONAL);
 	else
 		dma_free_coherent(hostdata->dev, TOTAL_MEM_SIZE,
 				  hostdata->script, hostdata->pScript);
-- 
2.28.0