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authorStephen Hemminger <stephen@networkplumber.org>2018-08-10 23:06:08 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-12 09:46:46 +0200
commitd765edbb301c0e196015a59b17420558088ea33f (patch)
treefbaad4a61147cc91b1cc20f0952dba8ca0498446 /drivers/hv/vmbus_drv.c
parent83b15fed91fa23facd159fb72c82241cbdc93d3f (diff)
vmbus: add driver_override support
Add support for overriding the default driver for a VMBus device in the same way that it can be done for PCI devices. This patch adds the /sys/bus/vmbus/devices/.../driver_override file and the logic for matching. This is used by driverctl tool to do driver override. https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitlab.com%2Fdriverctl%2Fdriverctl&amp;data=02%7C01%7Ckys%40microsoft.com%7C42e803feb2c544ef6ea908d5fd538878%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C636693457619960040&amp;sdata=kEyYHRIjNZCk%2B37moCSqbrZL426YccNQrsWpENcrZdw%3D&amp;reserved=0 Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hv/vmbus_drv.c')
-rw-r--r--drivers/hv/vmbus_drv.c115
1 files changed, 96 insertions, 19 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index b1b548a21f91..e6d8fdac6d8b 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -498,6 +498,54 @@ static ssize_t device_show(struct device *dev,
}
static DEVICE_ATTR_RO(device);
+static ssize_t driver_override_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hv_device *hv_dev = device_to_hv_device(dev);
+ char *driver_override, *old, *cp;
+
+ /* We need to keep extra room for a newline */
+ if (count >= (PAGE_SIZE - 1))
+ return -EINVAL;
+
+ driver_override = kstrndup(buf, count, GFP_KERNEL);
+ if (!driver_override)
+ return -ENOMEM;
+
+ cp = strchr(driver_override, '\n');
+ if (cp)
+ *cp = '\0';
+
+ device_lock(dev);
+ old = hv_dev->driver_override;
+ if (strlen(driver_override)) {
+ hv_dev->driver_override = driver_override;
+ } else {
+ kfree(driver_override);
+ hv_dev->driver_override = NULL;
+ }
+ device_unlock(dev);
+
+ kfree(old);
+
+ return count;
+}
+
+static ssize_t driver_override_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct hv_device *hv_dev = device_to_hv_device(dev);
+ ssize_t len;
+
+ device_lock(dev);
+ len = snprintf(buf, PAGE_SIZE, "%s\n", hv_dev->driver_override);
+ device_unlock(dev);
+
+ return len;
+}
+static DEVICE_ATTR_RW(driver_override);
+
/* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
static struct attribute *vmbus_dev_attrs[] = {
&dev_attr_id.attr,
@@ -528,6 +576,7 @@ static struct attribute *vmbus_dev_attrs[] = {
&dev_attr_channel_vp_mapping.attr,
&dev_attr_vendor.attr,
&dev_attr_device.attr,
+ &dev_attr_driver_override.attr,
NULL,
};
ATTRIBUTE_GROUPS(vmbus_dev);
@@ -563,17 +612,26 @@ static inline bool is_null_guid(const uuid_le *guid)
return true;
}
-/*
- * Return a matching hv_vmbus_device_id pointer.
- * If there is no match, return NULL.
- */
-static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv,
- const uuid_le *guid)
+static const struct hv_vmbus_device_id *
+hv_vmbus_dev_match(const struct hv_vmbus_device_id *id, const uuid_le *guid)
+
+{
+ if (id == NULL)
+ return NULL; /* empty device table */
+
+ for (; !is_null_guid(&id->guid); id++)
+ if (!uuid_le_cmp(id->guid, *guid))
+ return id;
+
+ return NULL;
+}
+
+static const struct hv_vmbus_device_id *
+hv_vmbus_dynid_match(struct hv_driver *drv, const uuid_le *guid)
{
const struct hv_vmbus_device_id *id = NULL;
struct vmbus_dynid *dynid;
- /* Look at the dynamic ids first, before the static ones */
spin_lock(&drv->dynids.lock);
list_for_each_entry(dynid, &drv->dynids.list, node) {
if (!uuid_le_cmp(dynid->id.guid, *guid)) {
@@ -583,18 +641,37 @@ static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv,
}
spin_unlock(&drv->dynids.lock);
- if (id)
- return id;
+ return id;
+}
- id = drv->id_table;
- if (id == NULL)
- return NULL; /* empty device table */
+static const struct hv_vmbus_device_id vmbus_device_null = {
+ .guid = NULL_UUID_LE,
+};
- for (; !is_null_guid(&id->guid); id++)
- if (!uuid_le_cmp(id->guid, *guid))
- return id;
+/*
+ * Return a matching hv_vmbus_device_id pointer.
+ * If there is no match, return NULL.
+ */
+static const struct hv_vmbus_device_id *hv_vmbus_get_id(struct hv_driver *drv,
+ struct hv_device *dev)
+{
+ const uuid_le *guid = &dev->dev_type;
+ const struct hv_vmbus_device_id *id;
- return NULL;
+ /* When driver_override is set, only bind to the matching driver */
+ if (dev->driver_override && strcmp(dev->driver_override, drv->name))
+ return NULL;
+
+ /* Look at the dynamic ids first, before the static ones */
+ id = hv_vmbus_dynid_match(drv, guid);
+ if (!id)
+ id = hv_vmbus_dev_match(drv->id_table, guid);
+
+ /* driver_override will always match, send a dummy id */
+ if (!id && dev->driver_override)
+ id = &vmbus_device_null;
+
+ return id;
}
/* vmbus_add_dynid - add a new device ID to this driver and re-probe devices */
@@ -643,7 +720,7 @@ static ssize_t new_id_store(struct device_driver *driver, const char *buf,
if (retval)
return retval;
- if (hv_vmbus_get_id(drv, &guid))
+ if (hv_vmbus_dynid_match(drv, &guid))
return -EEXIST;
retval = vmbus_add_dynid(drv, &guid);
@@ -708,7 +785,7 @@ static int vmbus_match(struct device *device, struct device_driver *driver)
if (is_hvsock_channel(hv_dev->channel))
return drv->hvsock;
- if (hv_vmbus_get_id(drv, &hv_dev->dev_type))
+ if (hv_vmbus_get_id(drv, hv_dev))
return 1;
return 0;
@@ -725,7 +802,7 @@ static int vmbus_probe(struct device *child_device)
struct hv_device *dev = device_to_hv_device(child_device);
const struct hv_vmbus_device_id *dev_id;
- dev_id = hv_vmbus_get_id(drv, &dev->dev_type);
+ dev_id = hv_vmbus_get_id(drv, dev);
if (drv->probe) {
ret = drv->probe(dev, dev_id);
if (ret != 0)