linux-kernel - [PATCH] media: dm1105: switch from 'pci_' to 'dma

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Date:   Tue, 28 Jul 2020 12:18:54 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     mchehab@...nel.org, sean@...s.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] media: dm1105: switch from 'pci_' to 'dma_' API

The wrappers in include/linux/pci-dma-compat.h should go away.

The patch has been generated with the coccinelle script below and has been
hand modified to replace GFP_ with a correct flag.
It has been compile tested.

When memory is allocated, GFP_KERNEL can be used because it is called from
the probe function and no lock is taken.

The call chain is:
   dm1105_probe
      --> dm1105_hw_init
         --> dm1105_dma_map

@@
@@
-    PCI_DMA_BIDIRECTIONAL
+    DMA_BIDIRECTIONAL

@@
@@
-    PCI_DMA_TODEVICE
+    DMA_TO_DEVICE

@@
@@
-    PCI_DMA_FROMDEVICE
+    DMA_FROM_DEVICE

@@
@@
-    PCI_DMA_NONE
+    DMA_NONE

@@
expression e1, e2, e3;
@@
-    pci_alloc_consistent(e1, e2, e3)
+    dma_alloc_coherent(&e1->dev, e2, e3, GFP_)

@@
expression e1, e2, e3;
@@
-    pci_zalloc_consistent(e1, e2, e3)
+    dma_alloc_coherent(&e1->dev, e2, e3, GFP_)

@@
expression e1, e2, e3, e4;
@@
-    pci_free_consistent(e1, e2, e3, e4)
+    dma_free_coherent(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_map_single(e1, e2, e3, e4)
+    dma_map_single(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_unmap_single(e1, e2, e3, e4)
+    dma_unmap_single(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4, e5;
@@
-    pci_map_page(e1, e2, e3, e4, e5)
+    dma_map_page(&e1->dev, e2, e3, e4, e5)

@@
expression e1, e2, e3, e4;
@@
-    pci_unmap_page(e1, e2, e3, e4)
+    dma_unmap_page(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_map_sg(e1, e2, e3, e4)
+    dma_map_sg(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_unmap_sg(e1, e2, e3, e4)
+    dma_unmap_sg(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_dma_sync_single_for_cpu(e1, e2, e3, e4)
+    dma_sync_single_for_cpu(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_dma_sync_single_for_device(e1, e2, e3, e4)
+    dma_sync_single_for_device(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_dma_sync_sg_for_cpu(e1, e2, e3, e4)
+    dma_sync_sg_for_cpu(&e1->dev, e2, e3, e4)

@@
expression e1, e2, e3, e4;
@@
-    pci_dma_sync_sg_for_device(e1, e2, e3, e4)
+    dma_sync_sg_for_device(&e1->dev, e2, e3, e4)

@@
expression e1, e2;
@@
-    pci_dma_mapping_error(e1, e2)
+    dma_mapping_error(&e1->dev, e2)

@@
expression e1, e2;
@@
-    pci_set_dma_mask(e1, e2)
+    dma_set_mask(&e1->dev, e2)

@@
expression e1, e2;
@@
-    pci_set_consistent_dma_mask(e1, e2)
+    dma_set_coherent_mask(&e1->dev, e2)

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
If needed, see post from Christoph Hellwig on the kernel-janitors ML:
   https://marc.info/?l=kernel-janitors&m=158745678307186&w=4
---
 drivers/media/pci/dm1105/dm1105.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/media/pci/dm1105/dm1105.c b/drivers/media/pci/dm1105/dm1105.c
index 9dce31d2b525..4ac645a56c14 100644
--- a/drivers/media/pci/dm1105/dm1105.c
+++ b/drivers/media/pci/dm1105/dm1105.c
@@ -604,19 +604,17 @@ static void dm1105_set_dma_addr(struct dm1105_dev *dev)
 
 static int dm1105_dma_map(struct dm1105_dev *dev)
 {
-	dev->ts_buf = pci_alloc_consistent(dev->pdev,
-					6 * DM1105_DMA_BYTES,
-					&dev->dma_addr);
+	dev->ts_buf = dma_alloc_coherent(&dev->pdev->dev,
+					 6 * DM1105_DMA_BYTES, &dev->dma_addr,
+					 GFP_KERNEL);
 
 	return !dev->ts_buf;
 }
 
 static void dm1105_dma_unmap(struct dm1105_dev *dev)
 {
-	pci_free_consistent(dev->pdev,
-			6 * DM1105_DMA_BYTES,
-			dev->ts_buf,
-			dev->dma_addr);
+	dma_free_coherent(&dev->pdev->dev, 6 * DM1105_DMA_BYTES, dev->ts_buf,
+			  dev->dma_addr);
 }
 
 static void dm1105_enable_irqs(struct dm1105_dev *dev)
@@ -1010,7 +1008,7 @@ static int dm1105_probe(struct pci_dev *pdev,
 	if (ret < 0)
 		goto err_kfree;
 
-	ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+	ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
 	if (ret < 0)
 		goto err_pci_disable_device;
 
-- 
2.25.1