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virtio-pci: Introduce admin command sending function

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Add support for sending admin command through admin virtqueue interface.
Abort any inflight admin commands once device reset completes. Activate
admin queue when device becomes ready; deactivate on device reset.

To comply to the below specification statement [1], the admin virtqueue
is activated for upper layer users only after setting DRIVER_OK status.

[1] The driver MUST NOT send any buffer available notifications to the
device before setting DRIVER_OK.

Signed-off-by: Feng Liu <feliu@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20231219093247.170936-4-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Feng Liu
2023-12-19 11:32:41 +02:00
committed by Alex Williamson
parent fd27ef6b44
commit 92792ac752
4 changed files with 177 additions and 2 deletions
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6
drivers/virtio/virtio_pci_common.h
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@@ -29,6 +29,7 @@
#include <linux/virtio_pci_modern.h>
#include <linux/highmem.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
struct virtio_pci_vq_info {
/* the actual virtqueue */
@@ -44,6 +45,8 @@ struct virtio_pci_vq_info {
struct virtio_pci_admin_vq {
/* Virtqueue info associated with this admin queue. */
struct virtio_pci_vq_info info;
/* serializing admin commands execution and virtqueue deletion */
struct mutex cmd_lock;
/* Name of the admin queue: avq.$vq_index. */
char name[10];
u16 vq_index;
@@ -152,4 +155,7 @@ static inline void virtio_pci_legacy_remove(struct virtio_pci_device *vp_dev)
int virtio_pci_modern_probe(struct virtio_pci_device *);
void virtio_pci_modern_remove(struct virtio_pci_device *);
int vp_modern_admin_cmd_exec(struct virtio_device *vdev,
struct virtio_admin_cmd *cmd);
#endif