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

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Date:   Fri, 27 Nov 2020 21:58:01 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     mchehab@...nel.org, baijiaju@...nghua.edu.cn, sean@...s.org,
        allen.lkml@...il.com, gustavoars@...nel.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: ttpci: 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 in 'av7110_attach()' GFP_KERNEL can be used
because this flag is already used above in the same function and no lock is
taken in the between.

@@
@@
-    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/ttpci/av7110.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/media/pci/ttpci/av7110.c b/drivers/media/pci/ttpci/av7110.c
index 2f7069e19b78..d74ee0ecfb36 100644
--- a/drivers/media/pci/ttpci/av7110.c
+++ b/drivers/media/pci/ttpci/av7110.c
@@ -1250,7 +1250,8 @@ static void vpeirq(struct tasklet_struct *t)
 		return;
 
 	/* Ensure streamed PCI data is synced to CPU */
-	pci_dma_sync_sg_for_cpu(budget->dev->pci, budget->pt.slist, budget->pt.nents, PCI_DMA_FROMDEVICE);
+	dma_sync_sg_for_cpu(&budget->dev->pci->dev, budget->pt.slist,
+			    budget->pt.nents, DMA_FROM_DEVICE);
 
 #if 0
 	/* track rps1 activity */
@@ -2637,7 +2638,8 @@ static int av7110_attach(struct saa7146_dev* dev,
 	av7110->arm_thread = NULL;
 
 	/* allocate and init buffers */
-	av7110->debi_virt = pci_alloc_consistent(pdev, 8192, &av7110->debi_bus);
+	av7110->debi_virt = dma_alloc_coherent(&pdev->dev, 8192,
+					       &av7110->debi_bus, GFP_KERNEL);
 	if (!av7110->debi_virt)
 		goto err_saa71466_vfree_4;
 
@@ -2726,7 +2728,8 @@ static int av7110_attach(struct saa7146_dev* dev,
 err_iobuf_vfree_6:
 	vfree(av7110->iobuf);
 err_pci_free_5:
-	pci_free_consistent(pdev, 8192, av7110->debi_virt, av7110->debi_bus);
+	dma_free_coherent(&pdev->dev, 8192, av7110->debi_virt,
+			  av7110->debi_bus);
 err_saa71466_vfree_4:
 	if (av7110->grabbing)
 		saa7146_vfree_destroy_pgtable(pdev, av7110->grabbing, &av7110->pt);
@@ -2779,8 +2782,8 @@ static int av7110_detach(struct saa7146_dev* saa)
 	av7110_av_exit(av7110);
 
 	vfree(av7110->iobuf);
-	pci_free_consistent(saa->pci, 8192, av7110->debi_virt,
-			    av7110->debi_bus);
+	dma_free_coherent(&saa->pci->dev, 8192, av7110->debi_virt,
+			  av7110->debi_bus);
 
 	i2c_del_adapter(&av7110->i2c_adap);
 
-- 
2.27.0