[PATCH v2 04/12] virtio: queue_reset: pci: update struct virtio_pci_common_cfg and option functions

[Xuan Zhuo]

Add queue_reset in virtio_pci_common_cfg, and add related operation
functions.

Signed-off-by: Xuan Zhuo <xuanz...@linux.alibaba.com>
---
 drivers/virtio/virtio_pci_modern_dev.c | 28 ++++++++++++++++++++++++++
 include/linux/virtio_pci_modern.h      |  2 ++
 include/uapi/linux/virtio_pci.h        |  1 +
 3 files changed, 31 insertions(+)

diff --git a/drivers/virtio/virtio_pci_modern_dev.c 
b/drivers/virtio/virtio_pci_modern_dev.c
index e11ed748e661..be02f812a2f6 100644
--- a/drivers/virtio/virtio_pci_modern_dev.c
+++ b/drivers/virtio/virtio_pci_modern_dev.c
@@ -463,6 +463,34 @@ 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_common_cfg __iomem *cfg = mdev->common;
+
+       vp_iowrite16(index, &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_common_cfg __iomem *cfg = mdev->common;
+
+       vp_iowrite16(index, &cfg->queue_select);
+       vp_iowrite16(1, &cfg->queue_reset);
+}
+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
diff --git a/include/linux/virtio_pci_modern.h 
b/include/linux/virtio_pci_modern.h
index eb2bd9b4077d..cc4154dd7b28 100644
--- a/include/linux/virtio_pci_modern.h
+++ b/include/linux/virtio_pci_modern.h
@@ -106,4 +106,6 @@ 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
diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
index 492c89f56c6a..bf10f349087f 100644
--- a/include/uapi/linux/virtio_pci.h
+++ b/include/uapi/linux/virtio_pci.h
@@ -165,6 +165,7 @@ struct virtio_pci_common_cfg {
        __le32 queue_used_lo;           /* read-write */
        __le32 queue_used_hi;           /* read-write */
        __le16 queue_notify_data;       /* read-write */
+       __le16 queue_reset;             /* read-write */
 };
 
 /* Fields in VIRTIO_PCI_CAP_PCI_CFG: */
-- 
2.31.0

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