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Date:   Sun,  6 Dec 2020 08:13:52 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     martyn@...chs.me.uk, manohar.vanga@...il.com,
        gregkh@...uxfoundation.org, arnd@...db.de, trix@...hat.com
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] vme: 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 'ca91cx42_alloc_consistent()' and
'tsi148_alloc_consistent()' GFP_KERNEL can be used because both functions
are called only from 'vme_alloc_consistent()' (vme.c). This function is
only called from the 'vme_user_probe()' probe function and no lock is
taken in the between.

When memory is allocated in 'ca91cx42_crcsr_init()' and
'tsi148_crcsr_init()' GFP_KERNEL can be used because both functions
are called only from their corresponding probe 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/vme/bridges/vme_ca91cx42.c | 13 +++++++------
 drivers/vme/bridges/vme_tsi148.c   | 13 +++++++------
 2 files changed, 14 insertions(+), 12 deletions(-)

diff --git a/drivers/vme/bridges/vme_ca91cx42.c b/drivers/vme/bridges/vme_ca91cx42.c
index ea938dc29c5e..439b0edeca08 100644
--- a/drivers/vme/bridges/vme_ca91cx42.c
+++ b/drivers/vme/bridges/vme_ca91cx42.c
@@ -1510,7 +1510,7 @@ static void *ca91cx42_alloc_consistent(struct device *parent, size_t size,
 	/* Find pci_dev container of dev */
 	pdev = to_pci_dev(parent);
 
-	return pci_alloc_consistent(pdev, size, dma);
+	return dma_alloc_coherent(&pdev->dev, size, dma, GFP_KERNEL);
 }
 
 static void ca91cx42_free_consistent(struct device *parent, size_t size,
@@ -1521,7 +1521,7 @@ static void ca91cx42_free_consistent(struct device *parent, size_t size,
 	/* Find pci_dev container of dev */
 	pdev = to_pci_dev(parent);
 
-	pci_free_consistent(pdev, size, vaddr, dma);
+	dma_free_coherent(&pdev->dev, size, vaddr, dma);
 }
 
 /*
@@ -1555,8 +1555,9 @@ static int ca91cx42_crcsr_init(struct vme_bridge *ca91cx42_bridge,
 	}
 
 	/* Allocate mem for CR/CSR image */
-	bridge->crcsr_kernel = pci_zalloc_consistent(pdev, VME_CRCSR_BUF_SIZE,
-						     &bridge->crcsr_bus);
+	bridge->crcsr_kernel = dma_alloc_coherent(&pdev->dev,
+						  VME_CRCSR_BUF_SIZE,
+						  &bridge->crcsr_bus, GFP_KERNEL);
 	if (!bridge->crcsr_kernel) {
 		dev_err(&pdev->dev, "Failed to allocate memory for CR/CSR "
 			"image\n");
@@ -1589,8 +1590,8 @@ static void ca91cx42_crcsr_exit(struct vme_bridge *ca91cx42_bridge,
 	/* Free image */
 	iowrite32(0, bridge->base + VCSR_TO);
 
-	pci_free_consistent(pdev, VME_CRCSR_BUF_SIZE, bridge->crcsr_kernel,
-		bridge->crcsr_bus);
+	dma_free_coherent(&pdev->dev, VME_CRCSR_BUF_SIZE,
+			  bridge->crcsr_kernel, bridge->crcsr_bus);
 }
 
 static int ca91cx42_probe(struct pci_dev *pdev, const struct pci_device_id *id)
diff --git a/drivers/vme/bridges/vme_tsi148.c b/drivers/vme/bridges/vme_tsi148.c
index 1227ea937059..be9051b02f24 100644
--- a/drivers/vme/bridges/vme_tsi148.c
+++ b/drivers/vme/bridges/vme_tsi148.c
@@ -2155,7 +2155,7 @@ static void *tsi148_alloc_consistent(struct device *parent, size_t size,
 	/* Find pci_dev container of dev */
 	pdev = to_pci_dev(parent);
 
-	return pci_alloc_consistent(pdev, size, dma);
+	return dma_alloc_coherent(&pdev->dev, size, dma, GFP_KERNEL);
 }
 
 static void tsi148_free_consistent(struct device *parent, size_t size,
@@ -2166,7 +2166,7 @@ static void tsi148_free_consistent(struct device *parent, size_t size,
 	/* Find pci_dev container of dev */
 	pdev = to_pci_dev(parent);
 
-	pci_free_consistent(pdev, size, vaddr, dma);
+	dma_free_coherent(&pdev->dev, size, vaddr, dma);
 }
 
 /*
@@ -2192,8 +2192,9 @@ static int tsi148_crcsr_init(struct vme_bridge *tsi148_bridge,
 	bridge = tsi148_bridge->driver_priv;
 
 	/* Allocate mem for CR/CSR image */
-	bridge->crcsr_kernel = pci_zalloc_consistent(pdev, VME_CRCSR_BUF_SIZE,
-						     &bridge->crcsr_bus);
+	bridge->crcsr_kernel = dma_alloc_coherent(&pdev->dev,
+						  VME_CRCSR_BUF_SIZE,
+						  &bridge->crcsr_bus, GFP_KERNEL);
 	if (!bridge->crcsr_kernel) {
 		dev_err(tsi148_bridge->parent, "Failed to allocate memory for "
 			"CR/CSR image\n");
@@ -2261,8 +2262,8 @@ static void tsi148_crcsr_exit(struct vme_bridge *tsi148_bridge,
 	iowrite32be(0, bridge->base + TSI148_LCSR_CROU);
 	iowrite32be(0, bridge->base + TSI148_LCSR_CROL);
 
-	pci_free_consistent(pdev, VME_CRCSR_BUF_SIZE, bridge->crcsr_kernel,
-		bridge->crcsr_bus);
+	dma_free_coherent(&pdev->dev, VME_CRCSR_BUF_SIZE,
+			  bridge->crcsr_kernel, bridge->crcsr_bus);
 }
 
 static int tsi148_probe(struct pci_dev *pdev, const struct pci_device_id *id)
-- 
2.27.0

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