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vfio-pci: Cleanup BAR access

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We can actually handle MMIO and I/O port from the same access function
since PCI already does abstraction of this.  The ROM BAR only requires
a minor difference, so it gets included too.  vfio_pci_config_readwrite
gets renamed for consistency.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson
2013-02-14 14:02:12 -07:00
parent 5b279a11d3
commit 906ee99dd2
4 changed files with 113 additions and 213 deletions
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26
drivers/vfio/pci/vfio_pci.c
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@@ -371,31 +371,21 @@ static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
{
unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
struct vfio_pci_device *vdev = device_data;
struct pci_dev *pdev = vdev->pdev;
if (index >= VFIO_PCI_NUM_REGIONS)
return -EINVAL;
switch (index) {
case VFIO_PCI_CONFIG_REGION_INDEX:
return vfio_pci_config_readwrite(vdev, buf, count,
ppos, iswrite);
return vfio_pci_config_rw(vdev, buf, count, ppos, iswrite);
case VFIO_PCI_ROM_REGION_INDEX:
if (iswrite)
return -EINVAL;
return vfio_pci_mem_readwrite(vdev, buf, count, ppos, false);
return vfio_pci_bar_rw(vdev, buf, count, ppos, false);
case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
{
unsigned long flags = pci_resource_flags(pdev, index);
if (flags & IORESOURCE_IO)
return vfio_pci_io_readwrite(vdev, buf, count,
ppos, iswrite);
if (flags & IORESOURCE_MEM)
return vfio_pci_mem_readwrite(vdev, buf, count,
ppos, iswrite);
}
return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite);
}
return -EINVAL;
@@ -404,13 +394,19 @@ static ssize_t vfio_pci_rw(void *device_data, char __user *buf,
static ssize_t vfio_pci_read(void *device_data, char __user *buf,
size_t count, loff_t *ppos)
{
if (!count)
return 0;
return vfio_pci_rw(device_data, buf, count, ppos, false);
}
static ssize_t vfio_pci_write(void *device_data, const char __user *buf,
size_t count, loff_t *ppos)
{
return vfio_pci_rw(device_data, buf, count, ppos, true);
if (!count)
return 0;
return vfio_pci_rw(device_data, (char __user *)buf, count, ppos, true);
}
static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)