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PCI: Allow read/write access to sysfs I/O port resources

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PCI sysfs resource files currently only allow mmap'ing.  On x86 this
works fine for memory backed BARs, but doesn't work at all for I/O
port backed BARs.  Add read/write to I/O port PCI sysfs resource
files to allow userspace access to these device regions.

Acked-by: Chris Wright <[email protected]>
Signed-off-by: Alex Williamson <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>
This commit is contained in:
Alex Williamson 2010-07-19 09:45:34 -06:00 • committed by Jesse Barnes
commit 8633328be2
2 changed files with 73 additions and 2 deletions
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68
drivers/pci/pci-sysfs.c
View file

@ -778,6 +778,70 @@ pci_mmap_resource_wc(struct file *filp, struct kobject *kobj,
return pci_mmap_resource(kobj, attr, vma, 1);
}
static ssize_t
pci_resource_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count, bool write)
{
struct pci_dev *pdev = to_pci_dev(container_of(kobj,
struct device, kobj));
struct resource *res = attr->private;
unsigned long port = off;
int i;
for (i = 0; i < PCI_ROM_RESOURCE; i++)
if (res == &pdev->resource[i])
break;
if (i >= PCI_ROM_RESOURCE)
return -ENODEV;
port += pci_resource_start(pdev, i);
if (port > pci_resource_end(pdev, i))
return 0;
if (port + count - 1 > pci_resource_end(pdev, i))
return -EINVAL;
switch (count) {
case 1:
if (write)
outb(*(u8 *)buf, port);
else
*(u8 *)buf = inb(port);
return 1;
case 2:
if (write)
outw(*(u16 *)buf, port);
else
*(u16 *)buf = inw(port);
return 2;
case 4:
if (write)
outl(*(u32 *)buf, port);
else
*(u32 *)buf = inl(port);
return 4;
}
return -EINVAL;
}
static ssize_t
pci_read_resource_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
return pci_resource_io(filp, kobj, attr, buf, off, count, false);
}
static ssize_t
pci_write_resource_io(struct file *filp, struct kobject *kobj,
struct bin_attribute *attr, char *buf,
loff_t off, size_t count)
{
return pci_resource_io(filp, kobj, attr, buf, off, count, true);
}
/**
* pci_remove_resource_files - cleanup resource files
* @pdev: dev to cleanup
@ -828,6 +892,10 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine)
sprintf(res_attr_name, "resource%d", num);
res_attr->mmap = pci_mmap_resource_uc;
}
if (pci_resource_flags(pdev, num) & IORESOURCE_IO) {
res_attr->read = pci_read_resource_io;
res_attr->write = pci_write_resource_io;
}
res_attr->attr.name = res_attr_name;
res_attr->attr.mode = S_IRUSR | S_IWUSR;
res_attr->size = pci_resource_len(pdev, num);