[PATCH] rtw88: switch from 'pci_' to 'dma_' API

From: Christophe JAILLET
Date: Thu Aug 20 2020 - 11:07:05 EST

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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 'rtw_pci_init_tx_ring()' and
'rtw_pci_init_rx_ring()' GFP_KERNEL can be used because both functions are
called from a probe function and no spinlock is taken.

The call chain is:
rtw_pci_probe
--> rtw_pci_setup_resource
--> rtw_pci_init
--> rtw_pci_init_trx_ring
--> rtw_pci_init_tx_ring
--> rtw_pci_init_rx_ring

@@
@@
- 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@xxxxxxxxxx>
---
If needed, see post from Christoph Hellwig on the kernel-janitors ML:
https://marc.info/?l=kernel-janitors&m=158745678307186&w=4
---
drivers/net/wireless/realtek/rtw88/pci.c | 33 ++++++++++++------------
1 file changed, 16 insertions(+), 17 deletions(-)

diff --git a/drivers/net/wireless/realtek/rtw88/pci.c b/drivers/net/wireless/realtek/rtw88/pci.c
index 3413973bc475..135dd331691c 100644
--- a/drivers/net/wireless/realtek/rtw88/pci.c
+++ b/drivers/net/wireless/realtek/rtw88/pci.c
@@ -109,7 +109,7 @@ static void rtw_pci_free_tx_ring_skbs(struct rtw_dev *rtwdev,
tx_data = rtw_pci_get_tx_data(skb);
dma = tx_data->dma;

- pci_unmap_single(pdev, dma, skb->len, PCI_DMA_TODEVICE);
+ dma_unmap_single(&pdev->dev, dma, skb->len, DMA_TO_DEVICE);
dev_kfree_skb_any(skb);
}
}
@@ -125,7 +125,7 @@ static void rtw_pci_free_tx_ring(struct rtw_dev *rtwdev,
rtw_pci_free_tx_ring_skbs(rtwdev, tx_ring);

/* free the ring itself */
- pci_free_consistent(pdev, ring_sz, head, tx_ring->r.dma);
+ dma_free_coherent(&pdev->dev, ring_sz, head, tx_ring->r.dma);
tx_ring->r.head = NULL;
}

@@ -144,7 +144,7 @@ static void rtw_pci_free_rx_ring_skbs(struct rtw_dev *rtwdev,
continue;

dma = *((dma_addr_t *)skb->cb);
- pci_unmap_single(pdev, dma, buf_sz, PCI_DMA_FROMDEVICE);
+ dma_unmap_single(&pdev->dev, dma, buf_sz, DMA_FROM_DEVICE);
dev_kfree_skb(skb);
rx_ring->buf[i] = NULL;
}
@@ -159,7 +159,7 @@ static void rtw_pci_free_rx_ring(struct rtw_dev *rtwdev,

rtw_pci_free_rx_ring_skbs(rtwdev, rx_ring);

- pci_free_consistent(pdev, ring_sz, head, rx_ring->r.dma);
+ dma_free_coherent(&pdev->dev, ring_sz, head, rx_ring->r.dma);
}

static void rtw_pci_free_trx_ring(struct rtw_dev *rtwdev)
@@ -194,7 +194,7 @@ static int rtw_pci_init_tx_ring(struct rtw_dev *rtwdev,
return -EINVAL;
}

- head = pci_zalloc_consistent(pdev, ring_sz, &dma);
+ head = dma_alloc_coherent(&pdev->dev, ring_sz, &dma, GFP_KERNEL);
if (!head) {
rtw_err(rtwdev, "failed to allocate tx ring\n");
return -ENOMEM;
@@ -223,8 +223,8 @@ static int rtw_pci_reset_rx_desc(struct rtw_dev *rtwdev, struct sk_buff *skb,
if (!skb)
return -EINVAL;

- dma = pci_map_single(pdev, skb->data, buf_sz, PCI_DMA_FROMDEVICE);
- if (pci_dma_mapping_error(pdev, dma))
+ dma = dma_map_single(&pdev->dev, skb->data, buf_sz, DMA_FROM_DEVICE);
+ if (dma_mapping_error(&pdev->dev, dma))
return -EBUSY;

*((dma_addr_t *)skb->cb) = dma;
@@ -272,7 +272,7 @@ static int rtw_pci_init_rx_ring(struct rtw_dev *rtwdev,
return -EINVAL;
}

- head = pci_zalloc_consistent(pdev, ring_sz, &dma);
+ head = dma_alloc_coherent(&pdev->dev, ring_sz, &dma, GFP_KERNEL);
if (!head) {
rtw_err(rtwdev, "failed to allocate rx ring\n");
return -ENOMEM;
@@ -311,11 +311,11 @@ static int rtw_pci_init_rx_ring(struct rtw_dev *rtwdev,
if (!skb)
continue;
dma = *((dma_addr_t *)skb->cb);
- pci_unmap_single(pdev, dma, buf_sz, PCI_DMA_FROMDEVICE);
+ dma_unmap_single(&pdev->dev, dma, buf_sz, DMA_FROM_DEVICE);
dev_kfree_skb_any(skb);
rx_ring->buf[i] = NULL;
}
- pci_free_consistent(pdev, ring_sz, head, dma);
+ dma_free_coherent(&pdev->dev, ring_sz, head, dma);

rtw_err(rtwdev, "failed to init rx buffer\n");

@@ -675,8 +675,7 @@ static void rtw_pci_release_rsvd_page(struct rtw_pci *rtwpci,

tx_data = rtw_pci_get_tx_data(prev);
dma = tx_data->dma;
- pci_unmap_single(rtwpci->pdev, dma, prev->len,
- PCI_DMA_TODEVICE);
+ dma_unmap_single(&rtwpci->pdev->dev, dma, prev->len, DMA_TO_DEVICE);
dev_kfree_skb_any(prev);
}

@@ -755,9 +754,9 @@ static int rtw_pci_tx_write_data(struct rtw_dev *rtwdev,
memset(pkt_desc, 0, tx_pkt_desc_sz);
pkt_info->qsel = rtw_pci_get_tx_qsel(skb, queue);
rtw_tx_fill_tx_desc(pkt_info, skb);
- dma = pci_map_single(rtwpci->pdev, skb->data, skb->len,
- PCI_DMA_TODEVICE);
- if (pci_dma_mapping_error(rtwpci->pdev, dma))
+ dma = dma_map_single(&rtwpci->pdev->dev, skb->data, skb->len,
+ DMA_TO_DEVICE);
+ if (dma_mapping_error(&rtwpci->pdev->dev, dma))
return -EBUSY;

/* after this we got dma mapped, there is no way back */
@@ -896,8 +895,8 @@ static void rtw_pci_tx_isr(struct rtw_dev *rtwdev, struct rtw_pci *rtwpci,
break;
}
tx_data = rtw_pci_get_tx_data(skb);
- pci_unmap_single(rtwpci->pdev, tx_data->dma, skb->len,
- PCI_DMA_TODEVICE);
+ dma_unmap_single(&rtwpci->pdev->dev, tx_data->dma, skb->len,
+ DMA_TO_DEVICE);

/* just free command packets from host to card */
if (hw_queue == RTW_TX_QUEUE_H2C) {
--
2.25.1

Next message: Christian Brauner: "Re: [PATCH 1/1] mm, oom_adj: don't loop through tasks in __set_oom_adj when not necessary"
Previous message: kernel test robot: "drivers/media/pci/dm1105/dm1105.c:386:17: sparse: sparse: cast removes address space '__iomem' of expression"
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