diff options
| author | Michael S. Tsirkin <mst@redhat.com> | 2009-05-14 13:55:41 +0300 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2009-06-12 22:16:37 +0930 |
| commit | 82af8ce84ed65d2fb6d8c017d3f2bbbf161061fb (patch) | |
| tree | aed59c86724c7d3f565d1c60b38d25a7bf20985b /include | |
| parent | 77cf524654a886e0fbbf03b16b44f048deef7b0c (diff) | |
virtio_pci: optional MSI-X support
This implements optional MSI-X support in virtio_pci.
MSI-X is used whenever the host supports at least 2 MSI-X
vectors: 1 for configuration changes and 1 for virtqueues.
Per-virtqueue vectors are allocated if enough vectors
available.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> (+ whitespace, style)
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/virtio_pci.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/virtio_pci.h b/include/linux/virtio_pci.h index cd0fd5d181a..9a3d7c48c62 100644 --- a/include/linux/virtio_pci.h +++ b/include/linux/virtio_pci.h @@ -47,9 +47,17 @@ /* The bit of the ISR which indicates a device configuration change. */ #define VIRTIO_PCI_ISR_CONFIG 0x2 +/* MSI-X registers: only enabled if MSI-X is enabled. */ +/* A 16-bit vector for configuration changes. */ +#define VIRTIO_MSI_CONFIG_VECTOR 20 +/* A 16-bit vector for selected queue notifications. */ +#define VIRTIO_MSI_QUEUE_VECTOR 22 +/* Vector value used to disable MSI for queue */ +#define VIRTIO_MSI_NO_VECTOR 0xffff + /* The remaining space is defined by each driver as the per-driver * configuration space */ -#define VIRTIO_PCI_CONFIG 20 +#define VIRTIO_PCI_CONFIG(dev) ((dev)->msix_enabled ? 24 : 20) /* Virtio ABI version, this must match exactly */ #define VIRTIO_PCI_ABI_VERSION 0 |