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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2010-11-08 14:26:36 -0500 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-04-14 11:17:54 -0400 |
| commit | c7c2c3a28657cfdcef50c02b18ccca3761209e17 (patch) | |
| tree | fc2a2c0652a61d9b0f582c33cfa4c75b3bd8a654 /drivers/xen | |
| parent | beafbdc1df02877612dc9039c1de0639921fddec (diff) | |
| download | lwn-c7c2c3a28657cfdcef50c02b18ccca3761209e17.tar.gz lwn-c7c2c3a28657cfdcef50c02b18ccca3761209e17.zip | |
xen/irq: Add support to check if IRQ line is shared with other domains.
We do this via the PHYSDEVOP_irq_status_query support hypervisor call.
We will get a positive value if another domain has binded its
PIRQ to the specified GSI (IRQ line).
[v2: Deal with v2.6.37-rc1 rebase fallout]
[v3: Deal with stable/irq.cleanup fallout]
[v4: xen_ignore_irq->xen_test_irq_shared]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/events.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index ac0e22826357..0ac7a149e7f2 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -1508,6 +1508,18 @@ void xen_poll_irq(int irq) xen_poll_irq_timeout(irq, 0 /* no timeout */); } +/* Check whether the IRQ line is shared with other guests. */ +int xen_test_irq_shared(int irq) +{ + struct irq_info *info = info_for_irq(irq); + struct physdev_irq_status_query irq_status = { .irq = info->u.pirq.pirq }; + + if (HYPERVISOR_physdev_op(PHYSDEVOP_irq_status_query, &irq_status)) + return 0; + return !(irq_status.flags & XENIRQSTAT_shared); +} +EXPORT_SYMBOL_GPL(xen_test_irq_shared); + void xen_irq_resume(void) { unsigned int cpu, evtchn; |