tty: synclink_gt: switch from 'pci_' to 'dma_' API
diff mbox series

Message ID 20200806054404.728854-1-christophe.jaillet@wanadoo.fr
State Accepted
Commit 68778cab29bf27a60b67f55d6f4710d9fa906eab
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Series
  • tty: synclink_gt: switch from 'pci_' to 'dma_' API
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Commit Message

Christophe JAILLET Aug. 6, 2020, 5:44 a.m. UTC
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 'alloc_desc()' and 'alloc_bufs()', GFP_KERNEL
can be used because it is only called from a probe function and no lock is
acquired.
The call chain is:
   init_one                    (the probe function)
      --> device_init
         --> alloc_dma_bufs
            --> alloc_desc
            --> alloc_bufs

@@
@@
-    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@wanadoo.fr>
---
If needed, see post from Christoph Hellwig on the kernel-janitors ML:
   https://marc.info/?l=kernel-janitors&m=158745678307186&w=4
---
 drivers/tty/synclink_gt.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

Comments

Jiri Slaby Aug. 8, 2020, 7:03 a.m. UTC | #1
On 06. 08. 20, 7:44, Christophe JAILLET wrote:
> 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 'alloc_desc()' and 'alloc_bufs()', GFP_KERNEL
> can be used because it is only called from a probe function and no lock is
> acquired.
> The call chain is:
>    init_one                    (the probe function)
>       --> device_init
>          --> alloc_dma_bufs
>             --> alloc_desc
>             --> alloc_bufs

Right.

...
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>

> ---
> If needed, see post from Christoph Hellwig on the kernel-janitors ML:
>    https://marc.info/?l=kernel-janitors&m=158745678307186&w=4
> ---
>  drivers/tty/synclink_gt.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
> index b794177ccfb9..1edf06653148 100644
> --- a/drivers/tty/synclink_gt.c
> +++ b/drivers/tty/synclink_gt.c
> @@ -3341,8 +3341,8 @@ static int alloc_desc(struct slgt_info *info)
>  	unsigned int pbufs;
>  
>  	/* allocate memory to hold descriptor lists */
> -	info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
> -					   &info->bufs_dma_addr);
> +	info->bufs = dma_alloc_coherent(&info->pdev->dev, DESC_LIST_SIZE,
> +					&info->bufs_dma_addr, GFP_KERNEL);
>  	if (info->bufs == NULL)
>  		return -ENOMEM;
>  
> @@ -3384,7 +3384,8 @@ static int alloc_desc(struct slgt_info *info)
>  static void free_desc(struct slgt_info *info)
>  {
>  	if (info->bufs != NULL) {
> -		pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
> +		dma_free_coherent(&info->pdev->dev, DESC_LIST_SIZE,
> +				  info->bufs, info->bufs_dma_addr);
>  		info->bufs  = NULL;
>  		info->rbufs = NULL;
>  		info->tbufs = NULL;
> @@ -3395,7 +3396,9 @@ static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
>  {
>  	int i;
>  	for (i=0; i < count; i++) {
> -		if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
> +		bufs[i].buf = dma_alloc_coherent(&info->pdev->dev, DMABUFSIZE,
> +						 &bufs[i].buf_dma_addr, GFP_KERNEL);
> +		if (!bufs[i].buf)
>  			return -ENOMEM;
>  		bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
>  	}
> @@ -3408,7 +3411,8 @@ static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
>  	for (i=0; i < count; i++) {
>  		if (bufs[i].buf == NULL)
>  			continue;
> -		pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
> +		dma_free_coherent(&info->pdev->dev, DMABUFSIZE, bufs[i].buf,
> +				  bufs[i].buf_dma_addr);
>  		bufs[i].buf = NULL;
>  	}
>  }
> 

thanks,

Patch
diff mbox series

diff --git a/drivers/tty/synclink_gt.c b/drivers/tty/synclink_gt.c
index b794177ccfb9..1edf06653148 100644
--- a/drivers/tty/synclink_gt.c
+++ b/drivers/tty/synclink_gt.c
@@ -3341,8 +3341,8 @@  static int alloc_desc(struct slgt_info *info)
 	unsigned int pbufs;
 
 	/* allocate memory to hold descriptor lists */
-	info->bufs = pci_zalloc_consistent(info->pdev, DESC_LIST_SIZE,
-					   &info->bufs_dma_addr);
+	info->bufs = dma_alloc_coherent(&info->pdev->dev, DESC_LIST_SIZE,
+					&info->bufs_dma_addr, GFP_KERNEL);
 	if (info->bufs == NULL)
 		return -ENOMEM;
 
@@ -3384,7 +3384,8 @@  static int alloc_desc(struct slgt_info *info)
 static void free_desc(struct slgt_info *info)
 {
 	if (info->bufs != NULL) {
-		pci_free_consistent(info->pdev, DESC_LIST_SIZE, info->bufs, info->bufs_dma_addr);
+		dma_free_coherent(&info->pdev->dev, DESC_LIST_SIZE,
+				  info->bufs, info->bufs_dma_addr);
 		info->bufs  = NULL;
 		info->rbufs = NULL;
 		info->tbufs = NULL;
@@ -3395,7 +3396,9 @@  static int alloc_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
 {
 	int i;
 	for (i=0; i < count; i++) {
-		if ((bufs[i].buf = pci_alloc_consistent(info->pdev, DMABUFSIZE, &bufs[i].buf_dma_addr)) == NULL)
+		bufs[i].buf = dma_alloc_coherent(&info->pdev->dev, DMABUFSIZE,
+						 &bufs[i].buf_dma_addr, GFP_KERNEL);
+		if (!bufs[i].buf)
 			return -ENOMEM;
 		bufs[i].pbuf  = cpu_to_le32((unsigned int)bufs[i].buf_dma_addr);
 	}
@@ -3408,7 +3411,8 @@  static void free_bufs(struct slgt_info *info, struct slgt_desc *bufs, int count)
 	for (i=0; i < count; i++) {
 		if (bufs[i].buf == NULL)
 			continue;
-		pci_free_consistent(info->pdev, DMABUFSIZE, bufs[i].buf, bufs[i].buf_dma_addr);
+		dma_free_coherent(&info->pdev->dev, DMABUFSIZE, bufs[i].buf,
+				  bufs[i].buf_dma_addr);
 		bufs[i].buf = NULL;
 	}
 }