[PATCH] RDMA/usnic: switch from 'pci_' to 'dma_' API

[PATCH] RDMA/usnic: switch from 'pci_' to 'dma_' API

[Christophe JAILLET]

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

The patch has been generated with the coccinelle script bellow.
It has been compile tested.

When memory is allocated, GFP_ATOMIC should be used to be consistent with
the surrounding code.

@@
@@
-    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\x158745678307186&w=4
---
 drivers/infiniband/hw/usnic/usnic_fwd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/hw/usnic/usnic_fwd.c b/drivers/infiniband/hw/usnic/usnic_fwd.c
index 7875883621f4..398c4c00b932 100644
--- a/drivers/infiniband/hw/usnic/usnic_fwd.c
+++ b/drivers/infiniband/hw/usnic/usnic_fwd.c
@@ -214,7 +214,7 @@ usnic_fwd_alloc_flow(struct usnic_fwd_dev *ufdev, struct filter *filter,
 	if (!flow)
 		return ERR_PTR(-ENOMEM);
 
-	tlv = pci_alloc_consistent(pdev, tlv_size, &tlv_pa);
+	tlv = dma_alloc_coherent(&pdev->dev, tlv_size, &tlv_pa, GFP_ATOMIC);
 	if (!tlv) {
 		usnic_err("Failed to allocate memory\n");
 		status = -ENOMEM;
@@ -258,7 +258,7 @@ usnic_fwd_alloc_flow(struct usnic_fwd_dev *ufdev, struct filter *filter,
 
 out_free_tlv:
 	spin_unlock(&ufdev->lock);
-	pci_free_consistent(pdev, tlv_size, tlv, tlv_pa);
+	dma_free_coherent(&pdev->dev, tlv_size, tlv, tlv_pa);
 	if (!status)
 		return flow;
 out_free_flow:
-- 
2.25.1

Re: [PATCH] RDMA/usnic: switch from 'pci_' to 'dma_' API

[Markus Elfring]

> The wrappers in include/linux/pci-dma-compat.h should go away.
>
> The patch has been generated with the coccinelle script bellow.

* I suggest to avoid a typo in a word at the sentence end.

* The script for the semantic patch language could be a bit nicer
  by the application of disjunctions instead of separate SmPL rules.
  Would you become interested in any further adjustments?


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

I find the last function parameter questionable.
An other flag was specified in a corresponding diff hunk.

Regards,
Markus

Re: [PATCH] RDMA/usnic: switch from 'pci_' to 'dma_' API

[Jason Gunthorpe]

On Sat, Jul 11, 2020 at 09:31:20AM +0200, Christophe JAILLET wrote:
> The wrappers in include/linux/pci-dma-compat.h should go away.
> 
> The patch has been generated with the coccinelle script bellow.
> It has been compile tested.
> 
> When memory is allocated, GFP_ATOMIC should be used to be consistent with
> the surrounding code.
> 
> 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\x158745678307186&w=4
> ---
>  drivers/infiniband/hw/usnic/usnic_fwd.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)

I checked the GFP and it looks OK to me, thanks.

Applied to for-next

Jason