On 2020/7/22 下午6:08, Zhu Lingshan wrote:
+/*
+ * Request irq for a vq, setup irq offloading if its a vhost_vdpa vq.
+ * This function should be only called through setting virtio DRIVER_OK.
+ * If you want to request irq during probe, you should use raw APIs
+ * like request_irq() or devm_request_irq().
This makes the API less flexibile. The reason is we store the irq in
vhost-vdpa not vDPA.
I wonder whether the following looks better:
1) store irq in vdpa device
2) register producer when DRIVER_OK and unregister producer when
!DRIVER_OK in vhost-vDPA
3) deal with the synchronization with SET_VRING_CALL
4) document that irq is not expected to be changed during DRIVER_OK
This can make sure the API works during driver probe, and we don't need
the setup_irq and unsetup_irq method in vdpa_driver
Thanks
+ */
+int vdpa_devm_request_irq(struct device *dev, struct vdpa_device *vdev,
+ unsigned int irq, irq_handler_t handler,
+ unsigned long irqflags, const char *devname, void *dev_id,
+ int qid)
+{
+ int ret;
+
+ ret = devm_request_irq(dev, irq, handler, irqflags, devname, dev_id);
+ if (ret)
+ dev_err(dev, "Failed to request irq for vq %d\n", qid);
+ else
+ vdpa_setup_irq(vdev, qid, irq);
+
+ return ret;
+
+}
+EXPORT_SYMBOL_GPL(vdpa_devm_request_irq);
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