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Subject[PATCH v10 04/17] vdpa: Fail the vdpa_reset() if fail to set device status to zero
Date
Re-read the device status to ensure it's set to zero during
resetting. Otherwise, fail the vdpa_reset() after timeout.

Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
---
include/linux/vdpa.h | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 406d53a606ac..d1a80ef05089 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -6,6 +6,7 @@
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/vhost_iotlb.h>
+#include <linux/delay.h>

/**
* struct vdpa_calllback - vDPA callback definition.
@@ -340,12 +341,24 @@ static inline struct device *vdpa_get_dma_dev(struct vdpa_device *vdev)
return vdev->dma_dev;
}

-static inline void vdpa_reset(struct vdpa_device *vdev)
+#define VDPA_RESET_TIMEOUT_MS 1000
+
+static inline int vdpa_reset(struct vdpa_device *vdev)
{
const struct vdpa_config_ops *ops = vdev->config;
+ int timeout = 0;

vdev->features_valid = false;
ops->set_status(vdev, 0);
+ while (ops->get_status(vdev)) {
+ timeout += 20;
+ if (timeout > VDPA_RESET_TIMEOUT_MS)
+ return -EIO;
+
+ msleep(20);
+ }
+
+ return 0;
}

static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features)
--
2.11.0
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