diff options
| author | Alex Williamson <alex.williamson@redhat.com> | 2013-02-18 21:11:13 +0400 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2013-02-18 21:11:13 +0400 |
| commit | 84237a826b261de7ddd3d09ee53ee68cb4138937 (patch) | |
| tree | ab0c6d1d07abd74e90db41521258615fc1eaa211 /drivers/vfio/pci/vfio_pci.c | |
| parent | 2dd1194833de133960f286903ce704cb10fa7eb0 (diff) | |
| download | linux-84237a826b261de7ddd3d09ee53ee68cb4138937.tar.xz | |
vfio-pci: Add support for VGA region access
PCI defines display class VGA regions at I/O port address 0x3b0, 0x3c0
and MMIO address 0xa0000. As these are non-overlapping, we can ignore
the I/O port vs MMIO difference and expose them both in a single
region. We make use of the VGA arbiter around each access to
configure chipset access as necessary.
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio/pci/vfio_pci.c')
| -rw-r--r-- | drivers/vfio/pci/vfio_pci.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c index bb8c8c2be960..8189cb6a86af 100644 --- a/drivers/vfio/pci/vfio_pci.c +++ b/drivers/vfio/pci/vfio_pci.c @@ -84,6 +84,11 @@ static int vfio_pci_enable(struct vfio_pci_device *vdev) } else vdev->msix_bar = 0xFF; +#ifdef CONFIG_VFIO_PCI_VGA + if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA) + vdev->has_vga = true; +#endif + return 0; } @@ -285,6 +290,16 @@ static long vfio_pci_ioctl(void *device_data, info.flags = VFIO_REGION_INFO_FLAG_READ; break; } + case VFIO_PCI_VGA_REGION_INDEX: + if (!vdev->has_vga) + return -EINVAL; + + info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index); + info.size = 0xc0000; + info.flags = VFIO_REGION_INFO_FLAG_READ | + VFIO_REGION_INFO_FLAG_WRITE; + + break; default: return -EINVAL; } @@ -386,6 +401,9 @@ static ssize_t vfio_pci_rw(void *device_data, char __user *buf, case VFIO_PCI_BAR0_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX: return vfio_pci_bar_rw(vdev, buf, count, ppos, iswrite); + + case VFIO_PCI_VGA_REGION_INDEX: + return vfio_pci_vga_rw(vdev, buf, count, ppos, iswrite); } return -EINVAL; |