From: Gregory Haskins <ghaskins@novell.com>
To: linux-kernel@vger.kernel.org
Cc: agraf@suse.de, pmullaney@novell.com, pmorreale@novell.com,
anthony@codemonkey.ws, rusty@rustcorp.com.au,
netdev@vger.kernel.org, kvm@vger.kernel.org
Subject: [RFC PATCH 04/17] vbus: add bus-registration notifiers
Date: Tue, 31 Mar 2009 14:43:07 -0400 [thread overview]
Message-ID: <20090331184307.28333.20322.stgit@dev.haskins.net> (raw)
In-Reply-To: <20090331184057.28333.77287.stgit@dev.haskins.net>
We need to get hotswap events in environments which cannot use existing
facilities (e.g. inotify). So we add a notifier-chain to allow client
callbacks whenever an interface is {un}registered.
Signed-off-by: Gregory Haskins <ghaskins@novell.com>
---
include/linux/vbus.h | 15 +++++++++++++
kernel/vbus/core.c | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
kernel/vbus/vbus.h | 1 +
3 files changed, 75 insertions(+), 0 deletions(-)
diff --git a/include/linux/vbus.h b/include/linux/vbus.h
index 5f0566c..04db4ff 100644
--- a/include/linux/vbus.h
+++ b/include/linux/vbus.h
@@ -29,6 +29,7 @@
#include <linux/sched.h>
#include <linux/rcupdate.h>
#include <linux/vbus_device.h>
+#include <linux/notifier.h>
struct vbus;
struct task_struct;
@@ -137,6 +138,20 @@ static inline void task_vbus_disassociate(struct task_struct *p)
}
}
+enum {
+ VBUS_EVENT_DEVADD,
+ VBUS_EVENT_DEVDROP,
+};
+
+struct vbus_event_devadd {
+ const char *type;
+ unsigned long id;
+};
+
+int vbus_notifier_register(struct vbus *vbus, struct notifier_block *nb);
+int vbus_notifier_unregister(struct vbus *vbus, struct notifier_block *nb);
+
+
#else /* CONFIG_VBUS */
#define fork_vbus(p) do { } while (0)
diff --git a/kernel/vbus/core.c b/kernel/vbus/core.c
index 033999f..b6df487 100644
--- a/kernel/vbus/core.c
+++ b/kernel/vbus/core.c
@@ -89,6 +89,7 @@ int vbus_device_interface_register(struct vbus_device *dev,
{
int ret;
struct vbus_devshell *ds = to_devshell(dev->kobj);
+ struct vbus_event_devadd ev;
mutex_lock(&vbus->lock);
@@ -124,6 +125,14 @@ int vbus_device_interface_register(struct vbus_device *dev,
if (ret)
goto error;
+ ev.type = intf->type;
+ ev.id = intf->id;
+
+ /* and let any clients know about the new device */
+ ret = raw_notifier_call_chain(&vbus->notifier, VBUS_EVENT_DEVADD, &ev);
+ if (ret < 0)
+ goto error;
+
mutex_unlock(&vbus->lock);
return 0;
@@ -144,6 +153,7 @@ int vbus_device_interface_unregister(struct vbus_device_interface *intf)
mutex_lock(&vbus->lock);
_interface_unregister(intf);
+ raw_notifier_call_chain(&vbus->notifier, VBUS_EVENT_DEVDROP, &intf->id);
mutex_unlock(&vbus->lock);
kobject_put(&intf->kobj);
@@ -346,6 +356,8 @@ int vbus_create(const char *name, struct vbus **bus)
_bus->next_id = 0;
+ RAW_INIT_NOTIFIER_HEAD(&_bus->notifier);
+
mutex_lock(&vbus_root.lock);
ret = map_add(&vbus_root.buses.map, &_bus->node);
@@ -358,6 +370,53 @@ int vbus_create(const char *name, struct vbus **bus)
return 0;
}
+#define for_each_rbnode(node, root) \
+ for (node = rb_first(root); node != NULL; node = rb_next(node))
+
+int vbus_notifier_register(struct vbus *vbus, struct notifier_block *nb)
+{
+ int ret;
+ struct rb_node *node;
+
+ mutex_lock(&vbus->lock);
+
+ /*
+ * resync the client for any devices we might already have
+ */
+ for_each_rbnode(node, &vbus->devices.map.root) {
+ struct vbus_device_interface *intf = node_to_intf(node);
+ struct vbus_event_devadd ev = {
+ .type = intf->type,
+ .id = intf->id,
+ };
+
+ ret = nb->notifier_call(nb, VBUS_EVENT_DEVADD, &ev);
+ if (ret & NOTIFY_STOP_MASK) {
+ mutex_unlock(&vbus->lock);
+ return -EPERM;
+ }
+ }
+
+ ret = raw_notifier_chain_register(&vbus->notifier, nb);
+
+ mutex_unlock(&vbus->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vbus_notifier_register);
+
+int vbus_notifier_unregister(struct vbus *vbus, struct notifier_block *nb)
+{
+ int ret;
+
+ mutex_lock(&vbus->lock);
+ ret = raw_notifier_chain_unregister(&vbus->notifier, nb);
+ mutex_unlock(&vbus->lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(vbus_notifier_unregister);
+
static void devshell_release(struct kobject *kobj)
{
struct vbus_devshell *ds = container_of(kobj,
diff --git a/kernel/vbus/vbus.h b/kernel/vbus/vbus.h
index 1266d69..cd2676b 100644
--- a/kernel/vbus/vbus.h
+++ b/kernel/vbus/vbus.h
@@ -51,6 +51,7 @@ struct vbus {
struct vbus_subdir members;
unsigned long next_id;
struct rb_node node;
+ struct raw_notifier_head notifier;
};
struct vbus_member {
next prev parent reply other threads:[~2009-03-31 18:41 UTC|newest]
Thread overview: 146+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-31 18:42 [RFC PATCH 00/17] virtual-bus Gregory Haskins
2009-03-31 18:42 ` [RFC PATCH 01/17] shm-signal: shared-memory signals Gregory Haskins
2009-03-31 20:44 ` Avi Kivity
2009-03-31 20:58 ` Gregory Haskins
2009-03-31 21:05 ` Avi Kivity
2009-04-01 12:12 ` Gregory Haskins
2009-04-01 12:24 ` Avi Kivity
2009-04-01 13:57 ` Gregory Haskins
2009-03-31 18:42 ` [RFC PATCH 02/17] vbus: add virtual-bus definitions Gregory Haskins
2009-04-02 16:06 ` Ben Hutchings
2009-04-02 18:13 ` Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 03/17] vbus: add connection-client helper infrastructure Gregory Haskins
2009-03-31 18:43 ` Gregory Haskins [this message]
2009-03-31 18:43 ` [RFC PATCH 05/17] vbus: add a "vbus-proxy" bus model for vbus_driver objects Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 06/17] ioq: Add basic definitions for a shared-memory, lockless queue Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 07/17] ioq: add vbus helpers Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 08/17] venet: add the ABI definitions for an 802.x packet interface Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 09/17] net: Add vbus_enet driver Gregory Haskins
2009-03-31 20:39 ` Stephen Hemminger
2009-04-02 11:43 ` Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 10/17] venet-tap: Adds a "venet" compatible "tap" device to VBUS Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 11/17] venet: add scatter-gather support Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 12/17] venettap: " Gregory Haskins
2009-03-31 18:43 ` [RFC PATCH 13/17] x86: allow the irq->vector translation to be determined outside of ioapic Gregory Haskins
2009-03-31 19:16 ` Alan Cox
2009-03-31 20:02 ` Gregory Haskins
2009-03-31 18:44 ` [RFC PATCH 14/17] kvm: add a reset capability Gregory Haskins
2009-03-31 19:22 ` Avi Kivity
2009-03-31 20:02 ` Gregory Haskins
2009-03-31 20:18 ` Avi Kivity
2009-03-31 20:37 ` Gregory Haskins
2009-03-31 18:44 ` [RFC PATCH 15/17] kvm: add dynamic IRQ support Gregory Haskins
2009-03-31 19:20 ` Avi Kivity
2009-03-31 19:39 ` Gregory Haskins
2009-03-31 20:13 ` Avi Kivity
2009-03-31 20:32 ` Gregory Haskins
2009-03-31 20:59 ` Avi Kivity
2009-03-31 18:44 ` [RFC PATCH 16/17] kvm: Add VBUS support to the host Gregory Haskins
2009-03-31 18:44 ` [RFC PATCH 17/17] kvm: Add guest-side support for VBUS Gregory Haskins
2009-03-31 20:18 ` [RFC PATCH 00/17] virtual-bus Andi Kleen
2009-04-01 12:03 ` Gregory Haskins
2009-04-01 13:23 ` Andi Kleen
2009-04-01 14:19 ` Gregory Haskins
2009-04-01 14:42 ` Gregory Haskins
2009-04-01 17:01 ` Andi Kleen
2009-04-01 18:45 ` Anthony Liguori
2009-04-01 20:40 ` Chris Wright
2009-04-01 21:11 ` Gregory Haskins
2009-04-01 21:28 ` Chris Wright
2009-04-01 22:10 ` Gregory Haskins
2009-04-02 6:00 ` Chris Wright
2009-04-02 3:11 ` Herbert Xu
2009-04-01 21:09 ` Gregory Haskins
2009-04-02 0:29 ` Anthony Liguori
2009-04-02 3:11 ` Gregory Haskins
2009-04-02 6:51 ` Avi Kivity
2009-04-02 8:52 ` Herbert Xu
2009-04-02 9:02 ` Avi Kivity
2009-04-02 9:16 ` Herbert Xu
2009-04-02 9:27 ` Avi Kivity
2009-04-02 9:29 ` Herbert Xu
2009-04-02 9:33 ` Herbert Xu
2009-04-02 9:38 ` Avi Kivity
2009-04-02 9:41 ` Herbert Xu
2009-04-02 9:43 ` Avi Kivity
2009-04-02 9:44 ` Herbert Xu
2009-04-02 11:06 ` Gregory Haskins
2009-04-02 11:59 ` Avi Kivity
2009-04-02 12:30 ` Gregory Haskins
2009-04-02 12:43 ` Avi Kivity
2009-04-02 13:03 ` Gregory Haskins
2009-04-02 12:13 ` Rusty Russell
2009-04-02 12:50 ` Gregory Haskins
2009-04-02 12:52 ` Gregory Haskins
2009-04-02 13:07 ` Avi Kivity
2009-04-02 13:22 ` Gregory Haskins
2009-04-02 13:27 ` Avi Kivity
2009-04-02 14:05 ` Gregory Haskins
2009-04-02 14:50 ` Herbert Xu
2009-04-02 15:00 ` Avi Kivity
2009-04-02 15:40 ` Herbert Xu
2009-04-02 15:57 ` Avi Kivity
2009-04-02 16:09 ` Herbert Xu
2009-04-02 16:54 ` Avi Kivity
2009-04-02 17:06 ` Herbert Xu
2009-04-02 17:17 ` Herbert Xu
2009-04-03 12:25 ` Avi Kivity
2009-04-02 15:10 ` Michael S. Tsirkin
2009-04-03 4:43 ` Jeremy Fitzhardinge
2009-04-02 10:55 ` Gregory Haskins
2009-04-02 11:48 ` Avi Kivity
2009-04-03 10:58 ` Gerd Hoffmann
2009-04-03 11:03 ` Avi Kivity
2009-04-03 11:12 ` Herbert Xu
2009-04-03 11:46 ` Avi Kivity
2009-04-03 11:48 ` Herbert Xu
2009-04-03 11:54 ` Avi Kivity
2009-04-03 11:55 ` Herbert Xu
2009-04-03 12:02 ` Avi Kivity
2009-04-03 13:05 ` Herbert Xu
2009-04-03 11:18 ` Andi Kleen
2009-04-03 11:34 ` Herbert Xu
2009-04-03 11:46 ` Avi Kivity
2009-04-03 11:28 ` Gregory Haskins
2009-04-02 10:46 ` Gregory Haskins
2009-04-02 11:43 ` Avi Kivity
2009-04-02 12:22 ` Gregory Haskins
2009-04-02 12:42 ` Avi Kivity
2009-04-02 12:54 ` Gregory Haskins
2009-04-02 13:08 ` Avi Kivity
2009-04-02 13:36 ` Gregory Haskins
2009-04-02 13:45 ` Avi Kivity
2009-04-02 14:24 ` Gregory Haskins
2009-04-02 14:32 ` Avi Kivity
2009-04-02 14:41 ` Avi Kivity
2009-04-02 14:49 ` Anthony Liguori
2009-04-02 16:09 ` Anthony Liguori
2009-04-02 16:19 ` Avi Kivity
2009-04-02 18:18 ` Anthony Liguori
2009-04-03 1:11 ` Herbert Xu
2009-04-20 18:02 ` Alex Williamson
2009-04-03 12:03 ` Gregory Haskins
2009-04-03 12:15 ` Avi Kivity
2009-04-03 13:13 ` Gregory Haskins
2009-04-03 13:37 ` Avi Kivity
2009-04-03 16:28 ` Gregory Haskins
2009-04-05 10:00 ` Avi Kivity
2009-04-02 3:09 ` Herbert Xu
2009-04-02 6:46 ` Avi Kivity
2009-04-02 8:54 ` Herbert Xu
2009-04-02 9:03 ` Avi Kivity
2009-04-02 9:05 ` Herbert Xu
2009-04-01 20:29 ` Gregory Haskins
2009-04-01 22:23 ` Andi Kleen
2009-04-01 23:05 ` Gregory Haskins
2009-04-01 6:08 ` Rusty Russell
2009-04-01 11:35 ` Gregory Haskins
2009-04-02 1:24 ` Rusty Russell
2009-04-02 2:27 ` Gregory Haskins
2009-04-01 16:10 ` Anthony Liguori
2009-04-05 3:44 ` Rusty Russell
2009-04-05 8:06 ` Avi Kivity
2009-04-05 14:13 ` Anthony Liguori
2009-04-05 16:10 ` Avi Kivity
2009-04-05 16:45 ` Anthony Liguori
2009-04-02 3:15 ` Herbert Xu
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