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Message-Id: <20200518024317.14055-1-yan.y.zhao@intel.com>
Date: Sun, 17 May 2020 22:43:17 -0400
From: Yan Zhao <yan.y.zhao@...el.com>
To: kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: alex.williamson@...hat.com, cohuck@...hat.com,
zhenyuw@...ux.intel.com, zhi.a.wang@...el.com,
kevin.tian@...el.com, shaopeng.he@...el.com, yi.l.liu@...el.com,
xin.zeng@...el.com, hang.yuan@...el.com,
Yan Zhao <yan.y.zhao@...el.com>
Subject: [RFC PATCH v4 01/10] vfio/pci: register/unregister vfio_pci_vendor_driver_ops
vfio_pci_vendor_driver_ops includes two parts:
(1) .probe() and .remove() interface to be called by vfio_pci_probe()
and vfio_pci_remove().
(2) pointer to struct vfio_device_ops. It will be registered as ops of vfio
device if .probe() succeeds.
Suggested-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Yan Zhao <yan.y.zhao@...el.com>
---
drivers/vfio/pci/vfio_pci.c | 102 +++++++++++++++++++++++++++-
drivers/vfio/pci/vfio_pci_private.h | 7 ++
include/linux/vfio.h | 9 +++
3 files changed, 117 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 6c6b37b5c04e..43d10d34cbc2 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -68,6 +68,11 @@ static inline bool vfio_vga_disabled(void)
#endif
}
+static struct vfio_pci {
+ struct mutex vendor_drivers_lock;
+ struct list_head vendor_drivers_list;
+} vfio_pci;
+
/*
* Our VGA arbiter participation is limited since we don't know anything
* about the device itself. However, if the device is the only VGA device
@@ -1570,6 +1575,35 @@ static int vfio_pci_bus_notifier(struct notifier_block *nb,
return 0;
}
+static int probe_vendor_drivers(struct vfio_pci_device *vdev)
+{
+ struct vfio_pci_vendor_driver *driver;
+ int ret = -ENODEV;
+
+ request_module("vfio-pci:%x-%x", vdev->pdev->vendor,
+ vdev->pdev->device);
+
+ mutex_lock(&vfio_pci.vendor_drivers_lock);
+ list_for_each_entry(driver, &vfio_pci.vendor_drivers_list, next) {
+ void *data;
+
+ if (!try_module_get(driver->ops->owner))
+ continue;
+
+ data = driver->ops->probe(vdev->pdev);
+ if (IS_ERR(data)) {
+ module_put(driver->ops->owner);
+ continue;
+ }
+ vdev->vendor_driver = driver;
+ vdev->vendor_data = data;
+ ret = 0;
+ break;
+ }
+ mutex_unlock(&vfio_pci.vendor_drivers_lock);
+ return ret;
+}
+
static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct vfio_pci_device *vdev;
@@ -1609,7 +1643,12 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
mutex_init(&vdev->ioeventfds_lock);
INIT_LIST_HEAD(&vdev->ioeventfds_list);
- ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
+ if (probe_vendor_drivers(vdev))
+ ret = vfio_add_group_dev(&pdev->dev, &vfio_pci_ops, vdev);
+ else
+ ret = vfio_add_group_dev(&pdev->dev,
+ vdev->vendor_driver->ops->device_ops,
+ vdev);
if (ret)
goto out_free;
@@ -1698,6 +1737,11 @@ static void vfio_pci_remove(struct pci_dev *pdev)
if (!disable_idle_d3)
vfio_pci_set_power_state(vdev, PCI_D0);
+ if (vdev->vendor_driver) {
+ vdev->vendor_driver->ops->remove(vdev->vendor_data);
+ module_put(vdev->vendor_driver->ops->owner);
+ }
+
kfree(vdev->pm_save);
kfree(vdev);
@@ -2035,6 +2079,8 @@ static int __init vfio_pci_init(void)
vfio_pci_fill_ids();
+ mutex_init(&vfio_pci.vendor_drivers_lock);
+ INIT_LIST_HEAD(&vfio_pci.vendor_drivers_list);
return 0;
out_driver:
@@ -2042,6 +2088,60 @@ static int __init vfio_pci_init(void)
return ret;
}
+int __vfio_pci_register_vendor_driver(struct vfio_pci_vendor_driver_ops *ops)
+{
+ struct vfio_pci_vendor_driver *driver, *tmp;
+
+ if (!ops || !ops->device_ops)
+ return -EINVAL;
+
+ driver = kzalloc(sizeof(*driver), GFP_KERNEL);
+ if (!driver)
+ return -ENOMEM;
+
+ driver->ops = ops;
+
+ mutex_lock(&vfio_pci.vendor_drivers_lock);
+
+ /* Check for duplicates */
+ list_for_each_entry(tmp, &vfio_pci.vendor_drivers_list, next) {
+ if (tmp->ops->device_ops == ops->device_ops) {
+ mutex_unlock(&vfio_pci.vendor_drivers_lock);
+ kfree(driver);
+ return -EINVAL;
+ }
+ }
+
+ list_add(&driver->next, &vfio_pci.vendor_drivers_list);
+
+ mutex_unlock(&vfio_pci.vendor_drivers_lock);
+
+ if (!try_module_get(THIS_MODULE))
+ return -ENODEV;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(__vfio_pci_register_vendor_driver);
+
+void vfio_pci_unregister_vendor_driver(struct vfio_device_ops *device_ops)
+{
+ struct vfio_pci_vendor_driver *driver, *tmp;
+
+ mutex_lock(&vfio_pci.vendor_drivers_lock);
+ list_for_each_entry_safe(driver, tmp,
+ &vfio_pci.vendor_drivers_list, next) {
+ if (driver->ops->device_ops == device_ops) {
+ list_del(&driver->next);
+ mutex_unlock(&vfio_pci.vendor_drivers_lock);
+ kfree(driver);
+ module_put(THIS_MODULE);
+ return;
+ }
+ }
+ mutex_unlock(&vfio_pci.vendor_drivers_lock);
+}
+EXPORT_SYMBOL_GPL(vfio_pci_unregister_vendor_driver);
+
module_init(vfio_pci_init);
module_exit(vfio_pci_cleanup);
diff --git a/drivers/vfio/pci/vfio_pci_private.h b/drivers/vfio/pci/vfio_pci_private.h
index 36ec69081ecd..7758a20546fa 100644
--- a/drivers/vfio/pci/vfio_pci_private.h
+++ b/drivers/vfio/pci/vfio_pci_private.h
@@ -92,6 +92,11 @@ struct vfio_pci_vf_token {
int users;
};
+struct vfio_pci_vendor_driver {
+ const struct vfio_pci_vendor_driver_ops *ops;
+ struct list_head next;
+};
+
struct vfio_pci_device {
struct pci_dev *pdev;
void __iomem *barmap[PCI_STD_NUM_BARS];
@@ -132,6 +137,8 @@ struct vfio_pci_device {
struct list_head ioeventfds_list;
struct vfio_pci_vf_token *vf_token;
struct notifier_block nb;
+ void *vendor_data;
+ struct vfio_pci_vendor_driver *vendor_driver;
};
#define is_intx(vdev) (vdev->irq_type == VFIO_PCI_INTX_IRQ_INDEX)
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 38d3c6a8dc7e..3e53deb012b6 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -214,4 +214,13 @@ extern int vfio_virqfd_enable(void *opaque,
void *data, struct virqfd **pvirqfd, int fd);
extern void vfio_virqfd_disable(struct virqfd **pvirqfd);
+struct vfio_pci_vendor_driver_ops {
+ char *name;
+ struct module *owner;
+ void *(*probe)(struct pci_dev *pdev);
+ void (*remove)(void *vendor_data);
+ struct vfio_device_ops *device_ops;
+};
+int __vfio_pci_register_vendor_driver(struct vfio_pci_vendor_driver_ops *ops);
+void vfio_pci_unregister_vendor_driver(struct vfio_device_ops *device_ops);
#endif /* VFIO_H */
--
2.17.1
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