From: Jason Wang <jasowang@redhat.com>
To: kvm@vger.kernel.org, linux-s390@vger.kernel.org,
linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
intel-gfx@lists.freedesktop.org,
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alex.williamson@redhat.com
Cc: mst@redhat.com, zhenyuw@linux.intel.com, zhi.a.wang@intel.com,
jani.nikula@linux.intel.com, joonas.lahtinen@linux.intel.com,
rodrigo.vivi@intel.com, airlied@linux.ie, daniel@ffwll.ch,
cohuck@redhat.com, farman@linux.ibm.com, pasic@linux.ibm.com,
sebott@linux.ibm.com, oberpar@linux.ibm.com,
heiko.carstens@de.ibm.com, gor@linux.ibm.com,
borntraeger@de.ibm.com, akrowiak@linux.ibm.com,
pmorel@linux.ibm.com, freude@linux.ibm.com, tiwei.bie@intel.com,
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zhihong.wang@intel.com, rob.miller@broadcom.com,
idos@mellanox.com, xiao.w.wang@intel.com, lingshan.zhu@intel.com,
Jason Wang <jasowang@redhat.com>
Subject: [RFC PATCH 1/2] mdev: device id support
Date: Thu, 12 Sep 2019 17:40:11 +0800 [thread overview]
Message-ID: <20190912094012.29653-2-jasowang@redhat.com> (raw)
In-Reply-To: <20190912094012.29653-1-jasowang@redhat.com>
Mdev bus only support vfio driver right now, so it doesn't implement
match method. But in the future, we may add drivers other than vfio,
one example is virtio-mdev[1] driver. This means we need to add device
id support in bus match method to pair the mdev device and mdev driver
correctly.
So this patch add id_table to mdev_driver and id for mdev parent, and
implement the match method for mdev bus.
[1] https://lkml.org/lkml/2019/9/10/135
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
drivers/gpu/drm/i915/gvt/kvmgt.c | 2 +-
drivers/s390/cio/vfio_ccw_ops.c | 2 +-
drivers/s390/crypto/vfio_ap_ops.c | 3 ++-
drivers/vfio/mdev/mdev_core.c | 14 ++++++++++++--
drivers/vfio/mdev/mdev_driver.c | 14 ++++++++++++++
drivers/vfio/mdev/mdev_private.h | 1 +
drivers/vfio/mdev/vfio_mdev.c | 6 ++++++
include/linux/mdev.h | 6 +++++-
include/linux/mod_devicetable.h | 6 ++++++
samples/vfio-mdev/mbochs.c | 2 +-
samples/vfio-mdev/mdpy.c | 2 +-
samples/vfio-mdev/mtty.c | 2 +-
12 files changed, 51 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index 23aa3e50cbf8..19d51a35f019 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -1625,7 +1625,7 @@ static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
return -EFAULT;
intel_vgpu_ops.supported_type_groups = kvm_vgpu_type_groups;
- return mdev_register_device(dev, &intel_vgpu_ops);
+ return mdev_register_vfio_device(dev, &intel_vgpu_ops);
}
static void kvmgt_host_exit(struct device *dev)
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index 5eb61116ca6f..f87d9409e290 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -578,7 +578,7 @@ static const struct mdev_parent_ops vfio_ccw_mdev_ops = {
int vfio_ccw_mdev_reg(struct subchannel *sch)
{
- return mdev_register_device(&sch->dev, &vfio_ccw_mdev_ops);
+ return mdev_register_vfio_device(&sch->dev, &vfio_ccw_mdev_ops);
}
void vfio_ccw_mdev_unreg(struct subchannel *sch)
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index 0604b49a4d32..eacbde3c7a97 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1295,7 +1295,8 @@ int vfio_ap_mdev_register(void)
{
atomic_set(&matrix_dev->available_instances, MAX_ZDEV_ENTRIES_EXT);
- return mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
+ return mdev_register_vfio_device(&matrix_dev->device,
+ &vfio_ap_matrix_ops);
}
void vfio_ap_mdev_unregister(void)
diff --git a/drivers/vfio/mdev/mdev_core.c b/drivers/vfio/mdev/mdev_core.c
index b558d4cfd082..fc07ff3ebe96 100644
--- a/drivers/vfio/mdev/mdev_core.c
+++ b/drivers/vfio/mdev/mdev_core.c
@@ -135,11 +135,14 @@ static int mdev_device_remove_cb(struct device *dev, void *data)
* mdev_register_device : Register a device
* @dev: device structure representing parent device.
* @ops: Parent device operation structure to be registered.
+ * @id: device id.
*
* Add device to list of registered parent devices.
* Returns a negative value on error, otherwise 0.
*/
-int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
+int mdev_register_device(struct device *dev,
+ const struct mdev_parent_ops *ops,
+ u8 id)
{
int ret;
struct mdev_parent *parent;
@@ -175,6 +178,7 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
parent->dev = dev;
parent->ops = ops;
+ parent->device_id = id;
if (!mdev_bus_compat_class) {
mdev_bus_compat_class = class_compat_register("mdev_bus");
@@ -208,7 +212,13 @@ int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops)
put_device(dev);
return ret;
}
-EXPORT_SYMBOL(mdev_register_device);
+
+int mdev_register_vfio_device(struct device *dev,
+ const struct mdev_parent_ops *ops)
+{
+ return mdev_register_device(dev, ops, MDEV_ID_VFIO);
+}
+EXPORT_SYMBOL(mdev_register_vfio_device);
/*
* mdev_unregister_device : Unregister a parent device
diff --git a/drivers/vfio/mdev/mdev_driver.c b/drivers/vfio/mdev/mdev_driver.c
index 0d3223aee20b..fd5e9541d18e 100644
--- a/drivers/vfio/mdev/mdev_driver.c
+++ b/drivers/vfio/mdev/mdev_driver.c
@@ -69,8 +69,22 @@ static int mdev_remove(struct device *dev)
return 0;
}
+static int mdev_match(struct device *dev, struct device_driver *drv)
+{
+ unsigned int i;
+ struct mdev_device *mdev = to_mdev_device(dev);
+ struct mdev_driver *mdrv = to_mdev_driver(drv);
+ const struct mdev_device_id *ids = mdrv->id_table;
+
+ for (i = 0; ids[i].id; i++)
+ if (ids[i].id == mdev->parent->device_id)
+ return 1;
+ return 0;
+}
+
struct bus_type mdev_bus_type = {
.name = "mdev",
+ .match = mdev_match,
.probe = mdev_probe,
.remove = mdev_remove,
};
diff --git a/drivers/vfio/mdev/mdev_private.h b/drivers/vfio/mdev/mdev_private.h
index 7d922950caaf..7fc8153671e0 100644
--- a/drivers/vfio/mdev/mdev_private.h
+++ b/drivers/vfio/mdev/mdev_private.h
@@ -22,6 +22,7 @@ struct mdev_parent {
struct list_head type_list;
/* Synchronize device creation/removal with parent unregistration */
struct rw_semaphore unreg_sem;
+ u8 device_id;
};
struct mdev_device {
diff --git a/drivers/vfio/mdev/vfio_mdev.c b/drivers/vfio/mdev/vfio_mdev.c
index 30964a4e0a28..887c57f10880 100644
--- a/drivers/vfio/mdev/vfio_mdev.c
+++ b/drivers/vfio/mdev/vfio_mdev.c
@@ -120,10 +120,16 @@ static void vfio_mdev_remove(struct device *dev)
vfio_del_group_dev(dev);
}
+static struct mdev_device_id id_table[] = {
+ { MDEV_ID_VFIO },
+ { 0 },
+};
+
static struct mdev_driver vfio_mdev_driver = {
.name = "vfio_mdev",
.probe = vfio_mdev_probe,
.remove = vfio_mdev_remove,
+ .id_table = id_table,
};
static int __init vfio_mdev_init(void)
diff --git a/include/linux/mdev.h b/include/linux/mdev.h
index 0ce30ca78db0..f85045392120 100644
--- a/include/linux/mdev.h
+++ b/include/linux/mdev.h
@@ -118,6 +118,7 @@ struct mdev_type_attribute mdev_type_attr_##_name = \
* @probe: called when new device created
* @remove: called when device removed
* @driver: device driver structure
+ * @id_table: the ids serviced by this driver.
*
**/
struct mdev_driver {
@@ -125,6 +126,7 @@ struct mdev_driver {
int (*probe)(struct device *dev);
void (*remove)(struct device *dev);
struct device_driver driver;
+ const struct mdev_device_id *id_table;
};
#define to_mdev_driver(drv) container_of(drv, struct mdev_driver, driver)
@@ -135,7 +137,7 @@ const guid_t *mdev_uuid(struct mdev_device *mdev);
extern struct bus_type mdev_bus_type;
-int mdev_register_device(struct device *dev, const struct mdev_parent_ops *ops);
+int mdev_register_vfio_device(struct device *dev, const struct mdev_parent_ops *ops);
void mdev_unregister_device(struct device *dev);
int mdev_register_driver(struct mdev_driver *drv, struct module *owner);
@@ -145,4 +147,6 @@ struct device *mdev_parent_dev(struct mdev_device *mdev);
struct device *mdev_dev(struct mdev_device *mdev);
struct mdev_device *mdev_from_dev(struct device *dev);
+#define MDEV_ID_VFIO 1 /* VFIO device */
+
#endif /* MDEV_H */
diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 5714fd35a83c..f1fc143df042 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -821,4 +821,10 @@ struct wmi_device_id {
const void *context;
};
+/* MDEV */
+
+struct mdev_device_id {
+ __u8 id;
+};
+
#endif /* LINUX_MOD_DEVICETABLE_H */
diff --git a/samples/vfio-mdev/mbochs.c b/samples/vfio-mdev/mbochs.c
index ac5c8c17b1ff..71a4469be85d 100644
--- a/samples/vfio-mdev/mbochs.c
+++ b/samples/vfio-mdev/mbochs.c
@@ -1468,7 +1468,7 @@ static int __init mbochs_dev_init(void)
if (ret)
goto failed2;
- ret = mdev_register_device(&mbochs_dev, &mdev_fops);
+ ret = mdev_register_vfio_device(&mbochs_dev, &mdev_fops);
if (ret)
goto failed3;
diff --git a/samples/vfio-mdev/mdpy.c b/samples/vfio-mdev/mdpy.c
index cc86bf6566e4..d3029dd27d91 100644
--- a/samples/vfio-mdev/mdpy.c
+++ b/samples/vfio-mdev/mdpy.c
@@ -775,7 +775,7 @@ static int __init mdpy_dev_init(void)
if (ret)
goto failed2;
- ret = mdev_register_device(&mdpy_dev, &mdev_fops);
+ ret = mdev_register_vfio_device(&mdpy_dev, &mdev_fops);
if (ret)
goto failed3;
diff --git a/samples/vfio-mdev/mtty.c b/samples/vfio-mdev/mtty.c
index 92e770a06ea2..744c88a6b22c 100644
--- a/samples/vfio-mdev/mtty.c
+++ b/samples/vfio-mdev/mtty.c
@@ -1468,7 +1468,7 @@ static int __init mtty_dev_init(void)
if (ret)
goto failed2;
- ret = mdev_register_device(&mtty_dev.dev, &mdev_fops);
+ ret = mdev_register_vfio_device(&mtty_dev.dev, &mdev_fops);
if (ret)
goto failed3;
--
2.19.1
next prev parent reply other threads:[~2019-09-12 9:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-12 9:40 [RFC PATCH 0/2] Mdev: support mutiple kinds of devices Jason Wang
2019-09-12 9:40 ` Jason Wang [this message]
2019-09-17 7:55 ` [RFC PATCH 1/2] mdev: device id support Tian, Kevin
2019-09-17 10:14 ` Jason Wang
2019-09-17 12:07 ` Cornelia Huck
2019-09-18 5:52 ` Jason Wang
2019-09-12 9:40 ` [RFC PATCH 2/2] mdev: introduce device specific ops Jason Wang
2019-09-12 9:51 ` Michael S. Tsirkin
2019-09-17 8:09 ` Tian, Kevin
2019-09-17 10:16 ` Jason Wang
2019-09-18 2:57 ` Tian, Kevin
2019-09-18 6:15 ` Jason Wang
2019-09-17 12:42 ` Cornelia Huck
2019-09-18 5:54 ` Jason Wang
2019-09-17 17:31 ` [RFC PATCH 0/2] Mdev: support mutiple kinds of devices Alex Williamson
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