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Date: Sun, 13 Sep 2020 09:55:59 +0300
From: Leon Romanovsky <leon@...nel.org>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: davem@...emloft.net, kuba@...nel.org, snelson@...sando.io,
jeffrey.t.kirsher@...el.com, mhabets@...arflare.com,
yuehaibing@...wei.com, mchehab+huawei@...nel.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] net: dl2k: switch from 'pci_' to 'dma_' API
On Sun, Sep 13, 2020 at 08:14:17AM +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 below and has been
> hand modified to replace GFP_ with a correct flag.
> It has been compile tested.
>
> When memory is allocated in 'rio_probe1()' GFP_KERNEL can be used because
> it is a 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/net/ethernet/dlink/dl2k.c | 80 ++++++++++++++++---------------
> 1 file changed, 41 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/net/ethernet/dlink/dl2k.c b/drivers/net/ethernet/dlink/dl2k.c
> index e8e563d6e86b..734acb834c98 100644
> --- a/drivers/net/ethernet/dlink/dl2k.c
> +++ b/drivers/net/ethernet/dlink/dl2k.c
> @@ -222,13 +222,15 @@ rio_probe1 (struct pci_dev *pdev, const struct pci_device_id *ent)
>
> pci_set_drvdata (pdev, dev);
>
> - ring_space = pci_alloc_consistent (pdev, TX_TOTAL_SIZE, &ring_dma);
> + ring_space = dma_alloc_coherent(&pdev->dev, TX_TOTAL_SIZE, &ring_dma,
> + GFP_KERNEL);
> if (!ring_space)
> goto err_out_iounmap;
> np->tx_ring = ring_space;
> np->tx_ring_dma = ring_dma;
>
> - ring_space = pci_alloc_consistent (pdev, RX_TOTAL_SIZE, &ring_dma);
> + ring_space = dma_alloc_coherent(&pdev->dev, RX_TOTAL_SIZE, &ring_dma,
> + GFP_KERNEL);
> if (!ring_space)
> goto err_out_unmap_tx;
> np->rx_ring = ring_space;
> @@ -279,9 +281,11 @@ rio_probe1 (struct pci_dev *pdev, const struct pci_device_id *ent)
> return 0;
>
> err_out_unmap_rx:
> - pci_free_consistent (pdev, RX_TOTAL_SIZE, np->rx_ring, np->rx_ring_dma);
> + dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, np->rx_ring,
> + np->rx_ring_dma);
> err_out_unmap_tx:
> - pci_free_consistent (pdev, TX_TOTAL_SIZE, np->tx_ring, np->tx_ring_dma);
> + dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, np->tx_ring,
> + np->tx_ring_dma);
> err_out_iounmap:
> #ifdef MEM_MAPPING
> pci_iounmap(pdev, np->ioaddr);
> @@ -435,8 +439,9 @@ static void free_list(struct net_device *dev)
> for (i = 0; i < RX_RING_SIZE; i++) {
> skb = np->rx_skbuff[i];
> if (skb) {
> - pci_unmap_single(np->pdev, desc_to_dma(&np->rx_ring[i]),
> - skb->len, PCI_DMA_FROMDEVICE);
> + dma_unmap_single(&np->pdev->dev,
> + desc_to_dma(&np->rx_ring[i]),
> + skb->len, DMA_FROM_DEVICE);
> dev_kfree_skb(skb);
> np->rx_skbuff[i] = NULL;
> }
> @@ -446,8 +451,9 @@ static void free_list(struct net_device *dev)
> for (i = 0; i < TX_RING_SIZE; i++) {
> skb = np->tx_skbuff[i];
> if (skb) {
> - pci_unmap_single(np->pdev, desc_to_dma(&np->tx_ring[i]),
> - skb->len, PCI_DMA_TODEVICE);
> + dma_unmap_single(&np->pdev->dev,
> + desc_to_dma(&np->tx_ring[i]),
> + skb->len, DMA_TO_DEVICE);
> dev_kfree_skb(skb);
> np->tx_skbuff[i] = NULL;
> }
> @@ -504,9 +510,8 @@ static int alloc_list(struct net_device *dev)
> sizeof(struct netdev_desc));
> /* Rubicon now supports 40 bits of addressing space. */
> np->rx_ring[i].fraginfo =
> - cpu_to_le64(pci_map_single(
> - np->pdev, skb->data, np->rx_buf_sz,
> - PCI_DMA_FROMDEVICE));
> + cpu_to_le64(dma_map_single(&np->pdev->dev, skb->data,
> + np->rx_buf_sz, DMA_FROM_DEVICE));
I'm aware that this was before, but both pci_map_single and
dma_map_single return an ERROR and it is wrong to set .fraginfo without
checking result.
Thanks
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