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OpenCloudOS-Kernel
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PCI/P2PDMA: use the dev_pagemap internal refcount 

The functionality is identical to the one currently open coded in
p2pdma.c.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Tested-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Christoph Hellwig 2019-06-26 14:27:16 +02:00 committed by Jason Gunthorpe
parent ea31d5859f
commit d0b3517dbc
1 changed files with 4 additions and 53 deletions
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57
drivers/pci/p2pdma.c
View File

@ -25,12 +25,6 @@ struct pci_p2pdma {
bool p2pmem_published;
};
struct p2pdma_pagemap {
struct dev_pagemap pgmap;
struct percpu_ref ref;
struct completion ref_done;
};
static ssize_t size_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@ -79,32 +73,6 @@ static const struct attribute_group p2pmem_group = {
.name = "p2pmem",
};
static struct p2pdma_pagemap *to_p2p_pgmap(struct percpu_ref *ref)
{
return container_of(ref, struct p2pdma_pagemap, ref);
}
static void pci_p2pdma_percpu_release(struct percpu_ref *ref)
{
struct p2pdma_pagemap *p2p_pgmap = to_p2p_pgmap(ref);
complete(&p2p_pgmap->ref_done);
}
static void pci_p2pdma_percpu_kill(struct dev_pagemap *pgmap)
{
percpu_ref_kill(pgmap->ref);
}
static void pci_p2pdma_percpu_cleanup(struct dev_pagemap *pgmap)
{
struct p2pdma_pagemap *p2p_pgmap =
container_of(pgmap, struct p2pdma_pagemap, pgmap);
wait_for_completion(&p2p_pgmap->ref_done);
percpu_ref_exit(&p2p_pgmap->ref);
}
static void pci_p2pdma_release(void *data)
{
struct pci_dev *pdev = data;
@ -154,11 +122,6 @@ out:
return error;
}
static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = {
.kill = pci_p2pdma_percpu_kill,
.cleanup = pci_p2pdma_percpu_cleanup,
};
/**
* pci_p2pdma_add_resource - add memory for use as p2p memory
* @pdev: the device to add the memory to
@ -172,7 +135,6 @@ static const struct dev_pagemap_ops pci_p2pdma_pagemap_ops = {
int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
u64 offset)
{
struct p2pdma_pagemap *p2p_pgmap;
struct dev_pagemap *pgmap;
void *addr;
int error;
@ -195,26 +157,15 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
return error;
}
p2p_pgmap = devm_kzalloc(&pdev->dev, sizeof(*p2p_pgmap), GFP_KERNEL);
if (!p2p_pgmap)
pgmap = devm_kzalloc(&pdev->dev, sizeof(*pgmap), GFP_KERNEL);
if (!pgmap)
return -ENOMEM;
init_completion(&p2p_pgmap->ref_done);
error = percpu_ref_init(&p2p_pgmap->ref,
pci_p2pdma_percpu_release, 0, GFP_KERNEL);
if (error)
goto pgmap_free;
pgmap = &p2p_pgmap->pgmap;
pgmap->res.start = pci_resource_start(pdev, bar) + offset;
pgmap->res.end = pgmap->res.start + size - 1;
pgmap->res.flags = pci_resource_flags(pdev, bar);
pgmap->ref = &p2p_pgmap->ref;
pgmap->type = MEMORY_DEVICE_PCI_P2PDMA;
pgmap->pci_p2pdma_bus_offset = pci_bus_address(pdev, bar) -
pci_resource_start(pdev, bar);
pgmap->ops = &pci_p2pdma_pagemap_ops;
addr = devm_memremap_pages(&pdev->dev, pgmap);
if (IS_ERR(addr)) {
@ -225,7 +176,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
error = gen_pool_add_owner(pdev->p2pdma->pool, (unsigned long)addr,
pci_bus_address(pdev, bar) + offset,
resource_size(&pgmap->res), dev_to_node(&pdev->dev),
&p2p_pgmap->ref);
pgmap->ref);
if (error)
goto pages_free;
@ -237,7 +188,7 @@ int pci_p2pdma_add_resource(struct pci_dev *pdev, int bar, size_t size,
pages_free:
devm_memunmap_pages(&pdev->dev, pgmap);
pgmap_free:
devm_kfree(&pdev->dev, p2p_pgmap);
devm_kfree(&pdev->dev, pgmap);
return error;
}
EXPORT_SYMBOL_GPL(pci_p2pdma_add_resource);