[PATCH] media: saa7146: switch from 'pci_' to 'dma_' API

From: Christophe JAILLET
Date: Sun Nov 29 2020 - 02:45:36 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 'saa7146_pgtable_alloc()' GFP_KERNEL can be
used because the callers are either .buf_prepare functions or function that
already use GFP_KERNEL (hidden in a 'vmalloc_32()' call).

When memory is allocated in 'saa7146_init_one()' GFP_KERNEL can be used
because it is probe function and no lock is taken in the between.

When memory is allocated in 'saa7146_vv_init()' GFP_KERNEL can be used
because this function already uses GFP_KERNEL and no lock is taken in the
between.

When memory is allocated in 'vbi_workaround()' GFP_KERNEL can be used
because it is only called from a .open function.

@@
@@
- 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/media/common/saa7146/saa7146_core.c | 39 +++++++++++----------
drivers/media/common/saa7146/saa7146_fops.c | 7 ++--
drivers/media/common/saa7146/saa7146_vbi.c | 6 ++--
3 files changed, 28 insertions(+), 24 deletions(-)

diff --git a/drivers/media/common/saa7146/saa7146_core.c b/drivers/media/common/saa7146/saa7146_core.c
index 21fb16cc5ca1..f2d13b71416c 100644
--- a/drivers/media/common/saa7146/saa7146_core.c
+++ b/drivers/media/common/saa7146/saa7146_core.c
@@ -177,7 +177,7 @@ void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa
goto err_free_slist;

pt->nents = pages;
- slen = pci_map_sg(pci,pt->slist,pt->nents,PCI_DMA_FROMDEVICE);
+ slen = dma_map_sg(&pci->dev, pt->slist, pt->nents, DMA_FROM_DEVICE);
if (0 == slen)
goto err_free_pgtable;

@@ -187,7 +187,7 @@ void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa
return mem;

err_unmap_sg:
- pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
+ dma_unmap_sg(&pci->dev, pt->slist, pt->nents, DMA_FROM_DEVICE);
err_free_pgtable:
saa7146_pgtable_free(pci, pt);
err_free_slist:
@@ -201,7 +201,7 @@ void *saa7146_vmalloc_build_pgtable(struct pci_dev *pci, long length, struct saa

void saa7146_vfree_destroy_pgtable(struct pci_dev *pci, void *mem, struct saa7146_pgtable *pt)
{
- pci_unmap_sg(pci, pt->slist, pt->nents, PCI_DMA_FROMDEVICE);
+ dma_unmap_sg(&pci->dev, pt->slist, pt->nents, DMA_FROM_DEVICE);
saa7146_pgtable_free(pci, pt);
kfree(pt->slist);
pt->slist = NULL;
@@ -212,7 +212,7 @@ void saa7146_pgtable_free(struct pci_dev *pci, struct saa7146_pgtable *pt)
{
if (NULL == pt->cpu)
return;
- pci_free_consistent(pci, pt->size, pt->cpu, pt->dma);
+ dma_free_coherent(&pci->dev, pt->size, pt->cpu, pt->dma);
pt->cpu = NULL;
}

@@ -221,7 +221,7 @@ int saa7146_pgtable_alloc(struct pci_dev *pci, struct saa7146_pgtable *pt)
__le32 *cpu;
dma_addr_t dma_addr = 0;

- cpu = pci_alloc_consistent(pci, PAGE_SIZE, &dma_addr);
+ cpu = dma_alloc_coherent(&pci->dev, PAGE_SIZE, &dma_addr, GFP_KERNEL);
if (NULL == cpu) {
return -ENOMEM;
}
@@ -412,18 +412,20 @@ static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent
err = -ENOMEM;

/* get memory for various stuff */
- dev->d_rps0.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
- &dev->d_rps0.dma_handle);
+ dev->d_rps0.cpu_addr = dma_alloc_coherent(&pci->dev, SAA7146_RPS_MEM,
+ &dev->d_rps0.dma_handle,
+ GFP_KERNEL);
if (!dev->d_rps0.cpu_addr)
goto err_free_irq;

- dev->d_rps1.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
- &dev->d_rps1.dma_handle);
+ dev->d_rps1.cpu_addr = dma_alloc_coherent(&pci->dev, SAA7146_RPS_MEM,
+ &dev->d_rps1.dma_handle,
+ GFP_KERNEL);
if (!dev->d_rps1.cpu_addr)
goto err_free_rps0;

- dev->d_i2c.cpu_addr = pci_zalloc_consistent(pci, SAA7146_RPS_MEM,
- &dev->d_i2c.dma_handle);
+ dev->d_i2c.cpu_addr = dma_alloc_coherent(&pci->dev, SAA7146_RPS_MEM,
+ &dev->d_i2c.dma_handle, GFP_KERNEL);
if (!dev->d_i2c.cpu_addr)
goto err_free_rps1;

@@ -471,14 +473,14 @@ static int saa7146_init_one(struct pci_dev *pci, const struct pci_device_id *ent
return err;

err_free_i2c:
- pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
- dev->d_i2c.dma_handle);
+ dma_free_coherent(&pci->dev, SAA7146_RPS_MEM, dev->d_i2c.cpu_addr,
+ dev->d_i2c.dma_handle);
err_free_rps1:
- pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
- dev->d_rps1.dma_handle);
+ dma_free_coherent(&pci->dev, SAA7146_RPS_MEM, dev->d_rps1.cpu_addr,
+ dev->d_rps1.dma_handle);
err_free_rps0:
- pci_free_consistent(pci, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
- dev->d_rps0.dma_handle);
+ dma_free_coherent(&pci->dev, SAA7146_RPS_MEM, dev->d_rps0.cpu_addr,
+ dev->d_rps0.dma_handle);
err_free_irq:
free_irq(pci->irq, (void *)dev);
err_unmap:
@@ -519,7 +521,8 @@ static void saa7146_remove_one(struct pci_dev *pdev)
free_irq(pdev->irq, dev);

for (p = dev_map; p->addr; p++)
- pci_free_consistent(pdev, SAA7146_RPS_MEM, p->addr, p->dma);
+ dma_free_coherent(&pdev->dev, SAA7146_RPS_MEM, p->addr,
+ p->dma);

iounmap(dev->mem);
pci_release_region(pdev, 0);
diff --git a/drivers/media/common/saa7146/saa7146_fops.c b/drivers/media/common/saa7146/saa7146_fops.c
index e936c56b0378..7b1840cad278 100644
--- a/drivers/media/common/saa7146/saa7146_fops.c
+++ b/drivers/media/common/saa7146/saa7146_fops.c
@@ -515,8 +515,8 @@ int saa7146_vv_init(struct saa7146_dev* dev, struct saa7146_ext_vv *ext_vv)
dev->ext_vv_data = ext_vv;

vv->d_clipping.cpu_addr =
- pci_zalloc_consistent(dev->pci, SAA7146_CLIPPING_MEM,
- &vv->d_clipping.dma_handle);
+ dma_alloc_coherent(&dev->pci->dev, SAA7146_CLIPPING_MEM,
+ &vv->d_clipping.dma_handle, GFP_);
if( NULL == vv->d_clipping.cpu_addr ) {
ERR("out of memory. aborting.\n");
kfree(vv);
@@ -574,7 +574,8 @@ int saa7146_vv_release(struct saa7146_dev* dev)
DEB_EE("dev:%p\n", dev);

v4l2_device_unregister(&dev->v4l2_dev);
- pci_free_consistent(dev->pci, SAA7146_CLIPPING_MEM, vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
+ dma_free_coherent(&dev->pci->dev, SAA7146_CLIPPING_MEM,
+ vv->d_clipping.cpu_addr, vv->d_clipping.dma_handle);
v4l2_ctrl_handler_free(&dev->ctrl_handler);
kfree(vv);
dev->vv_data = NULL;
diff --git a/drivers/media/common/saa7146/saa7146_vbi.c b/drivers/media/common/saa7146/saa7146_vbi.c
index e1d369b976ed..e140d4a5aeb2 100644
--- a/drivers/media/common/saa7146/saa7146_vbi.c
+++ b/drivers/media/common/saa7146/saa7146_vbi.c
@@ -22,7 +22,7 @@ static int vbi_workaround(struct saa7146_dev *dev)
as specified. there is this workaround, but please
don't let me explain it. ;-) */

- cpu = pci_alloc_consistent(dev->pci, 4096, &dma_addr);
+ cpu = dma_alloc_coherent(&dev->pci->dev, 4096, &dma_addr, GFP_);
if (NULL == cpu)
return -ENOMEM;

@@ -123,12 +123,12 @@ static int vbi_workaround(struct saa7146_dev *dev)
/* stop rps1 for sure */
saa7146_write(dev, MC1, MASK_29);

- pci_free_consistent(dev->pci, 4096, cpu, dma_addr);
+ dma_free_coherent(&dev->pci->dev, 4096, cpu, dma_addr);
return -EINTR;
}
}

- pci_free_consistent(dev->pci, 4096, cpu, dma_addr);
+ dma_free_coherent(&dev->pci->dev, 4096, cpu, dma_addr);
return 0;
}

--
2.27.0

Next message: Mike Galbraith: "Re: scheduling while atomic in z3fold"
Previous message: Randy Dunlap: "[PATCH] SCSI: bnx2i: requires MMU"
Next in thread: Christophe JAILLET: "Re: [PATCH NACK] media: saa7146: switch from 'pci_' to 'dma_' API"
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