From: Zhu Lingshan <lingshan.zhu@intel.com>
To: jasowang@redhat.com, alex.williamson@redhat.com, mst@redhat.com,
pbonzini@redhat.com, sean.j.christopherson@intel.com,
wanpengli@tencent.com
Cc: virtualization@lists.linux-foundation.org,
netdev@vger.kernel.org, kvm@vger.kernel.org,
Zhu Lingshan <lingshan.zhu@intel.com>
Subject: [PATCH V3 4/6] vhost_vdpa: implement IRQ offloading in vhost_vdpa
Date: Wed, 22 Jul 2020 18:08:57 +0800 [thread overview]
Message-ID: <20200722100859.221669-5-lingshan.zhu@intel.com> (raw)
In-Reply-To: <20200722100859.221669-1-lingshan.zhu@intel.com>
This patch introduce a set of functions for setup/unsetup
and update irq offloading respectively by register/unregister
and re-register the irq_bypass_producer.
Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com>
---
drivers/vhost/Kconfig | 1 +
drivers/vhost/vdpa.c | 66 ++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 66 insertions(+), 1 deletion(-)
diff --git a/drivers/vhost/Kconfig b/drivers/vhost/Kconfig
index d3688c6afb87..587fbae06182 100644
--- a/drivers/vhost/Kconfig
+++ b/drivers/vhost/Kconfig
@@ -65,6 +65,7 @@ config VHOST_VDPA
tristate "Vhost driver for vDPA-based backend"
depends on EVENTFD
select VHOST
+ select IRQ_BYPASS_MANAGER
depends on VDPA
help
This kernel module can be loaded in host kernel to accelerate
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index df3cf386b0cd..558cf0863126 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -115,6 +115,54 @@ static irqreturn_t vhost_vdpa_config_cb(void *private)
return IRQ_HANDLED;
}
+static void vhost_vdpa_setup_vq_irq(struct vdpa_device *dev, int qid, int irq)
+{
+ struct vhost_vdpa *v = vdpa_get_drvdata(dev);
+ struct vhost_virtqueue *vq = &v->vqs[qid];
+ int ret;
+
+ spin_lock(&vq->call_ctx.ctx_lock);
+ if (!vq->call_ctx.ctx) {
+ spin_unlock(&vq->call_ctx.ctx_lock);
+ return;
+ }
+
+ vq->call_ctx.producer.token = vq->call_ctx.ctx;
+ vq->call_ctx.producer.irq = irq;
+ ret = irq_bypass_register_producer(&vq->call_ctx.producer);
+ spin_unlock(&vq->call_ctx.ctx_lock);
+}
+
+static void vhost_vdpa_unsetup_vq_irq(struct vdpa_device *dev, int qid)
+{
+ struct vhost_vdpa *v = vdpa_get_drvdata(dev);
+ struct vhost_virtqueue *vq = &v->vqs[qid];
+
+ spin_lock(&vq->call_ctx.ctx_lock);
+ irq_bypass_unregister_producer(&vq->call_ctx.producer);
+ spin_unlock(&vq->call_ctx.ctx_lock);
+}
+
+static void vhost_vdpa_update_vq_irq(struct vhost_virtqueue *vq)
+{
+ spin_lock(&vq->call_ctx.ctx_lock);
+ /*
+ * if it has a non-zero irq, means there is a
+ * previsouly registered irq_bypass_producer,
+ * we should update it when ctx (its token)
+ * changes.
+ */
+ if (!vq->call_ctx.producer.irq) {
+ spin_unlock(&vq->call_ctx.ctx_lock);
+ return;
+ }
+
+ irq_bypass_unregister_producer(&vq->call_ctx.producer);
+ vq->call_ctx.producer.token = vq->call_ctx.ctx;
+ irq_bypass_register_producer(&vq->call_ctx.producer);
+ spin_unlock(&vq->call_ctx.ctx_lock);
+}
+
static void vhost_vdpa_reset(struct vhost_vdpa *v)
{
struct vdpa_device *vdpa = v->vdpa;
@@ -122,7 +170,6 @@ static void vhost_vdpa_reset(struct vhost_vdpa *v)
ops->set_status(vdpa, 0);
}
-
static long vhost_vdpa_get_device_id(struct vhost_vdpa *v, u8 __user *argp)
{
struct vdpa_device *vdpa = v->vdpa;
@@ -332,6 +379,7 @@ static long vhost_vdpa_set_config_call(struct vhost_vdpa *v, u32 __user *argp)
return 0;
}
+
static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
void __user *argp)
{
@@ -390,6 +438,7 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
cb.private = NULL;
}
ops->set_vq_cb(vdpa, idx, &cb);
+ vhost_vdpa_update_vq_irq(vq);
break;
case VHOST_SET_VRING_NUM:
@@ -765,6 +814,18 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep)
return r;
}
+static void vhost_vdpa_clean_irq(struct vhost_vdpa *v)
+{
+ struct vhost_virtqueue *vq;
+ int i;
+
+ for (i = 0; i < v->nvqs; i++) {
+ vq = &v->vqs[i];
+ if (vq->call_ctx.producer.irq)
+ irq_bypass_unregister_producer(&vq->call_ctx.producer);
+ }
+}
+
static int vhost_vdpa_release(struct inode *inode, struct file *filep)
{
struct vhost_vdpa *v = filep->private_data;
@@ -777,6 +838,7 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep)
vhost_vdpa_iotlb_free(v);
vhost_vdpa_free_domain(v);
vhost_vdpa_config_put(v);
+ vhost_vdpa_clean_irq(v);
vhost_dev_cleanup(&v->vdev);
kfree(v->vdev.vqs);
mutex_unlock(&d->mutex);
@@ -951,6 +1013,8 @@ static struct vdpa_driver vhost_vdpa_driver = {
},
.probe = vhost_vdpa_probe,
.remove = vhost_vdpa_remove,
+ .setup_vq_irq = vhost_vdpa_setup_vq_irq,
+ .unsetup_vq_irq = vhost_vdpa_unsetup_vq_irq,
};
static int __init vhost_vdpa_init(void)
--
2.18.4
next prev parent reply other threads:[~2020-07-22 10:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-22 10:08 [PATCH V3 0/6] IRQ offloading for vDPA Zhu Lingshan
2020-07-22 10:08 ` [PATCH V3 1/6] vhost: introduce vhost_vring_call Zhu Lingshan
2020-07-22 10:08 ` [PATCH V3 2/6] kvm: detect assigned device via irqbypass manager Zhu Lingshan
2020-07-22 10:08 ` [PATCH V3 3/6] vDPA: implement vq IRQ allocate/free helpers in vDPA core Zhu Lingshan
2020-07-23 4:19 ` Jason Wang
2020-07-22 10:08 ` Zhu Lingshan [this message]
2020-07-22 10:08 ` [PATCH V3 5/6] ifcvf: replace irq_request/free with vDPA helpers Zhu Lingshan
2020-07-22 10:08 ` [PATCH V3 6/6] irqbypass: do not start cons/prod when failed connect Zhu Lingshan
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