Re: [Xen-devel] irqhandler for xenbus device

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.03.12 at 07:26, Nupur Ghatnekar <nupurghatnekar@xxxxxxxxx> wrote:
> Hello,
> 
> I have written 2 modules (front and backend) of a device driver.
> here all i have tried to do is share a page and map the page.
> i have added an irqhandler to the eventchannel using
> bind_interdomain_evtchn_to_irqhandler()
> 
> but ,this is what i got.. i do not understand what happened.
> 
> any help will be appreciated!!
> 
> [ 6098.141305] p9_xen_backend_init
> [ 6098.141332] leaving backend_init
> [ 6169.434245] Backprobe fired 1
> [ 6169.434703] node name: /local/domain/2/device/p9xen/0
> [ 6169.434980] INITIAL PAGE: 855 INITAL PORT: 34
> [ 6169.435005] Map Successful: data: Hey this is a new page..we just sent
> it!
> [ 6169.435032]  interrupt registered:: 312
> [ 6169.435037]  we are in the irq handler!!312
> [ 6169.435040]
> [ 6169.435040]  notify by irq
> [ 6169.435043] irq event 312: bogus return value 33

Doesn't this tell you pretty clearly what was wrong (presumably in
your interrupt handler function)?

Jan

> [ 6169.435047] Pid: 20, comm: xenwatch Tainted: G        WC
> 3.0.0-12-generic-pae #20-Ubuntu
> [ 6169.435050] Call Trace:
> [ 6169.435059]  [<c15414ca>] ? printk+0x2d/0x2f
> [ 6169.435066]  [<c10b3c99>] __report_bad_irq+0x29/0xd0
> [ 6169.435070]  [<c10b4031>] note_interrupt+0xd1/0x150
> [ 6169.435075]  [<effb91d1>] ? p9xen_irq+0x31/0x40 [p9_xen_backend]
> [ 6169.435079]  [<c10b258e>] handle_irq_event_percpu+0x9e/0x200
> [ 6169.435085]  [<c128d1ba>] ? radix_tree_lookup+0xa/0x10
> [ 6169.435089]  [<c10b40fd>] ? irq_get_irq_data+0xd/0x10
> [ 6169.435094]  [<c131c32d>] ? info_for_irq+0xd/0x20
> [ 6169.435098]  [<c10b272b>] handle_irq_event+0x3b/0x60
> [ 6169.435102]  [<c10b48c6>] handle_edge_irq+0x66/0xf0
> [ 6169.435106]  [<c131c265>] __xen_evtchn_do_upcall+0x155/0x200
> [ 6169.435110]  [<c131df90>] xen_evtchn_do_upcall+0x20/0x40
> [ 6169.435115]  [<c155cc17>] xen_do_upcall+0x7/0xc
> [ 6169.435120]  [<c1002407>] ? hypercall_page+0x407/0x1000
> [ 6169.435124]  [<c131fcfe>] ? xb_write+0xce/0x1e0
> [ 6169.435131]  [<c1050972>] ? console_unlock+0xa2/0xf0
> [ 6169.435134]  [<c1050bf1>] ? vprintk+0x151/0x430
> [ 6169.435138]  [<c132078d>] xs_talkv+0x5d/0x1a0
> [ 6169.435143]  [<c1291d31>] ? vsnprintf+0xb1/0x390
> [ 6169.435147]  [<c132091a>] xs_watch+0x4a/0x60
> [ 6169.435150]  [<c1320bb3>] register_xenbus_watch+0x83/0xf0
> [ 6169.435154]  [<c131f8ca>] xenbus_watch_path+0x2a/0x70
> [ 6169.435158]  [<c1295033>] ? kvasprintf+0x43/0x60
> [ 6169.435162]  [<c131f948>] xenbus_watch_pathfmt+0x38/0x70
> [ 6169.435166]  [<c13222b0>] ? xenbus_uevent_backend+0xb0/0xb0
> [ 6169.435170]  [<c1321bac>] xenbus_dev_probe+0xac/0x140
> [ 6169.435174]  [<c13222b0>] ? xenbus_uevent_backend+0xb0/0xb0
> [ 6169.435179]  [<c135f1ad>] really_probe+0x4d/0x150
> [ 6169.435184]  [<c13675c0>] ? pm_runtime_barrier+0x50/0xb0
> [ 6169.435188]  [<c135f3ea>] driver_probe_device+0x3a/0x60
> [ 6169.435191]  [<c135f4f1>] __device_attach+0x41/0x50
> [ 6169.435195]  [<c135f4b0>] ? __driver_attach+0xa0/0xa0
> [ 6169.435199]  [<c135e279>] bus_for_each_drv+0x49/0x70
> [ 6169.435202]  [<c135f37a>] device_attach+0x8a/0xa0
> [ 6169.435206]  [<c135f4b0>] ? __driver_attach+0xa0/0xa0
> [ 6169.435209]  [<c135eaa5>] bus_probe_device+0x25/0x40
> [ 6169.435214]  [<c135d0bc>] device_add+0x28c/0x380
> [ 6169.435218]  [<c13652da>] ? device_pm_init+0x4a/0x60
> [ 6169.435222]  [<c135d1c7>] device_register+0x17/0x20
> [ 6169.435226]  [<c1321e21>] xenbus_probe_node.part.4+0x101/0x170
> [ 6169.435230]  [<c1321ed3>] xenbus_probe_node+0x43/0x60
> [ 6169.435234]  [<c1322173>] xenbus_dev_changed.part.7+0x163/0x170
> [ 6169.435239]  [<c1007248>] ? xen_force_evtchn_callback+0x18/0x30
> [ 6169.435243]  [<c10079e0>] ? check_events+0x8/0xc
> [ 6169.435247]  [<c13221b7>] xenbus_dev_changed+0x37/0x40
> [ 6169.435251]  [<c13221f6>] backend_changed+0x16/0x20
> [ 6169.435254]  [<c1320567>] xenwatch_thread+0x87/0x130
> [ 6169.435260]  [<c106f280>] ? add_wait_queue+0x50/0x50
> [ 6169.435264]  [<c13204e0>] ? xenbus_thread+0x40/0x40
> [ 6169.435268]  [<c106ea7d>] kthread+0x6d/0x80
> [ 6169.435271]  [<c106ea10>] ? flush_kthread_worker+0x80/0x80
> [ 6169.435275]  [<c155cbbe>] kernel_thread_helper+0x6/0x10
> [ 6169.435277] handlers:
> [ 6169.435280] [<effb91a0>] p9xen_irq
> 
> 
> -- 
> 
> Nupur Ghatnekar



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