[Qemu-devel] Re: [PATCH] Release usb devices on shutdown and usb_del command

[Shahar Havivi]

On Tue, May 25, 2010 at 10:58:50AM +0200, Gerd Hoffmann wrote:
 Date: Tue, 25 May 2010 10:58:50 +0200
 From: Gerd Hoffmann kra...@redhat.com
 To: Shahar Havivi shah...@redhat.com
 CC: David S. Ahern daah...@cisco.com,
   Markus Armbruster arm...@redhat.com, qemu-devel@nongnu.org
 Subject: Re: [PATCH] Release usb devices on shutdown and usb_del command
 
 On 05/21/10 19:55, Shahar Havivi wrote:
 Remove usb_host_device_release and using usb_host_close to handle usb_del 
 command.
 Gerd, What do you think about the usb_cleanup()?
 
 We need a mechanism to handle this for sure.  I don't like that
 usb-specific approach very much though.
 
 I think we should either do that at qdev level, then at exit walk
 the whole device tree and call cleanup functions (if present).  So
 every device has the chance to do cleanups when needed.
 
 Or we could have a exit notifier, which can be used for device (and
 also other) cleanup work.
 
 I tend to think that a exit notifier will be better.  We probably
 have only a few devices which actually have to do some cleanup work
 (usb passthrough, maybe pci passthrough too), so building qdev
 infrastructure for that feels a bit like overkill.  And exit
 notifiers are more generic, i.e. it will also work for non-device
 stuff.
 
 cheers,
   Gerd
 
We can add at exit to the first device that added in usb-linux.c via
usb_host_device_open() or usb_host_initfn() and the exit will iterate
all usb devices in linux only,
How is that solution?

[Qemu-devel] Re: [PATCH] Release usb devices on shutdown and usb_del command

[Gerd Hoffmann]

On 05/21/10 19:55, Shahar Havivi wrote:

Remove usb_host_device_release and using usb_host_close to handle usb_del 
command.
Gerd, What do you think about the usb_cleanup()?


We need a mechanism to handle this for sure.  I don't like that 
usb-specific approach very much though.


I think we should either do that at qdev level, then at exit walk the 
whole device tree and call cleanup functions (if present).  So every 
device has the chance to do cleanups when needed.


Or we could have a exit notifier, which can be used for device (and also 
other) cleanup work.


I tend to think that a exit notifier will be better.  We probably have 
only a few devices which actually have to do some cleanup work (usb 
passthrough, maybe pci passthrough too), so building qdev infrastructure 
for that feels a bit like overkill.  And exit notifiers are more 
generic, i.e. it will also work for non-device stuff.


cheers,
  Gerd

[Qemu-devel] Re: [PATCH] Release usb devices on shutdown and usb_del command

[Shahar Havivi]

Remove usb_host_device_release and using usb_host_close to handle usb_del 
command.
Gerd, What do you think about the usb_cleanup()?
If it will be in usb-linux.c we will
have to ad atexit to each device, if we usb-bus.c we will have to implement in
bsd and stub...

Signed-off-by: Shahar Havivi shah...@redhat.com
---
 hw/usb.h|1 +
 usb-bsd.c   |5 +
 usb-linux.c |   12 
 usb-stub.c  |5 +
 vl.c|1 +
 5 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/hw/usb.h b/hw/usb.h
index 00d2802..7ddf63c 100644
--- a/hw/usb.h
+++ b/hw/usb.h
@@ -258,6 +258,7 @@ void usb_send_msg(USBDevice *dev, int msg);
 USBDevice *usb_host_device_open(const char *devname);
 int usb_host_device_close(const char *devname);
 void usb_host_info(Monitor *mon);
+void usb_cleanup(void);
 
 /* usb-hid.c */
 void usb_hid_datain_cb(USBDevice *dev, void *opaque, void (*datain)(void *));
diff --git a/usb-bsd.c b/usb-bsd.c
index 48567a3..c3eb891 100644
--- a/usb-bsd.c
+++ b/usb-bsd.c
@@ -634,3 +634,8 @@ int usb_host_device_close(const char *devname)
 {
 return 0;
 }
+
+void usb_cleanup(void)
+{
+return 0;
+}
diff --git a/usb-linux.c b/usb-linux.c
index 88273ff..98909b7 100644
--- a/usb-linux.c
+++ b/usb-linux.c
@@ -286,6 +286,17 @@ static void async_cancel(USBPacket *unused, void *opaque)
 }
 }
 
+void usb_cleanup(void)
+{
+struct USBHostDevice *s;
+
+QTAILQ_FOREACH(s, hostdevs, next) {
+if (s-fd != -1) {
+ioctl(s-fd, USBDEVFS_RESET);
+}
+}
+}
+
 static int usb_host_claim_interfaces(USBHostDevice *dev, int configuration)
 {
 int dev_descr_len, config_descr_len;
@@ -991,6 +1002,7 @@ static int usb_host_close(USBHostDevice *dev)
 async_complete(dev);
 dev-closing = 0;
 usb_device_detach(dev-dev);
+ioctl(dev-fd, USBDEVFS_RESET);
 close(dev-fd);
 dev-fd = -1;
 return 0;
diff --git a/usb-stub.c b/usb-stub.c
index 9c3fcea..bb513de 100644
--- a/usb-stub.c
+++ b/usb-stub.c
@@ -50,3 +50,8 @@ int usb_host_device_close(const char *devname)
 {
 return 0;
 }
+
+void usb_cleanup(void)
+{
+return 0;
+}
diff --git a/vl.c b/vl.c
index d77b47c..e3f4dc9 100644
--- a/vl.c
+++ b/vl.c
@@ -3914,6 +3914,7 @@ int main(int argc, char **argv, char **envp)
 main_loop();
 quit_timers();
 net_cleanup();
+usb_cleanup();
 
 return 0;
 }
-- 
1.7.0.4