Re: [PATCH v11 28/40] virtio_pci: introduce helper to get/set queue reset

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在 2022/6/29 14:56, Xuan Zhuo 写道:
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@xxxxxxxxxxxxxxxxx>


Acked-by: Jason Wang <jasowang@xxxxxxxxxx>


---
  drivers/virtio/virtio_pci_modern_dev.c | 35 ++++++++++++++++++++++++++
  include/linux/virtio_pci_modern.h      |  2 ++
  2 files changed, 37 insertions(+)

diff --git a/drivers/virtio/virtio_pci_modern_dev.c b/drivers/virtio/virtio_pci_modern_dev.c
index fa2a9445bb18..07415654247c 100644
--- a/drivers/virtio/virtio_pci_modern_dev.c
+++ b/drivers/virtio/virtio_pci_modern_dev.c
@@ -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 +475,40 @@ 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);
+
+	while (vp_ioread16(&cfg->queue_reset))
+		msleep(1);
+
+	while (vp_ioread16(&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
diff --git a/include/linux/virtio_pci_modern.h b/include/linux/virtio_pci_modern.h
index beebc7a4a31d..ded01157f864 100644
--- a/include/linux/virtio_pci_modern.h
+++ b/include/linux/virtio_pci_modern.h
@@ -134,4 +134,6 @@ 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




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