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virtio_pci: introduce helper to get/set queue reset

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Introduce new helpers to implement queue reset and get queue reset
status.

 https://github.com/oasis-tcs/virtio-spec/issues/124
 https://github.com/oasis-tcs/virtio-spec/issues/139

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220801063902.129329-31-xuanzhuo@linux.alibaba.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xuan Zhuo 2022-08-01 14:38:50 +08:00 committed by Michael S. Tsirkin
parent 0cdd450e70
commit 0b50cece0b
2 changed files with 41 additions and 0 deletions
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39
drivers/virtio/virtio_pci_modern_dev.c
View file

@ -3,6 +3,7 @@
#include <linux/virtio_pci_modern.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/delay.h>
/*
* vp_modern_map_capability - map a part of virtio pci capability
@ -474,6 +475,44 @@ void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
}
EXPORT_SYMBOL_GPL(vp_modern_set_status);
/*
* vp_modern_get_queue_reset - get the queue reset status
* @mdev: the modern virtio-pci device
* @index: queue index
*/
int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
{
struct virtio_pci_modern_common_cfg __iomem *cfg;
cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
vp_iowrite16(index, &cfg->cfg.queue_select);
return vp_ioread16(&cfg->queue_reset);
}
EXPORT_SYMBOL_GPL(vp_modern_get_queue_reset);
/*
* vp_modern_set_queue_reset - reset the queue
* @mdev: the modern virtio-pci device
* @index: queue index
*/
void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index)
{
struct virtio_pci_modern_common_cfg __iomem *cfg;
cfg = (struct virtio_pci_modern_common_cfg __iomem *)mdev->common;
vp_iowrite16(index, &cfg->cfg.queue_select);
vp_iowrite16(1, &cfg->queue_reset);
while (vp_ioread16(&cfg->queue_reset))
msleep(1);
while (vp_ioread16(&cfg->cfg.queue_enable))
msleep(1);
}
EXPORT_SYMBOL_GPL(vp_modern_set_queue_reset);
/*
* vp_modern_queue_vector - set the MSIX vector for a specific virtqueue
* @mdev: the modern virtio-pci device

2
include/linux/virtio_pci_modern.h
View file

@ -113,4 +113,6 @@ void __iomem * vp_modern_map_vq_notify(struct virtio_pci_modern_device *mdev,
u16 index, resource_size_t *pa);
int vp_modern_probe(struct virtio_pci_modern_device *mdev);
void vp_modern_remove(struct virtio_pci_modern_device *mdev);
int vp_modern_get_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
void vp_modern_set_queue_reset(struct virtio_pci_modern_device *mdev, u16 index);
#endif