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| author | John Baldwin <jhb@FreeBSD.org> | 2018-11-15 18:37:41 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2018-11-15 18:37:41 +0000 |
| commit | b6b42932dbeaa0c7f249494fb1840deb4f2b7553 (patch) | |
| tree | 81646e8327f90ea45ddb74fe3702228aa6412dbc /sys/x86/xen/xen_intr.c | |
| parent | aaf1f854e11fbd97bf1bcec98b0e83a95114521d (diff) | |
| download | src-b6b42932dbeaa0c7f249494fb1840deb4f2b7553.tar.gz src-b6b42932dbeaa0c7f249494fb1840deb4f2b7553.zip | |
Convert the number of MSI IRQs on x86 from a constant to a tunable.
The number of MSI IRQs still defaults to 512, but it can now be
changed at boot time via the machdep.num_msi_irqs tunable.
Reviewed by: kib, royger (older version)
Reviewed by: markj
MFC after: 1 month
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D17977
Notes
Notes:
svn path=/head/; revision=340460
Diffstat (limited to 'sys/x86/xen/xen_intr.c')
| -rw-r--r-- | sys/x86/xen/xen_intr.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/sys/x86/xen/xen_intr.c b/sys/x86/xen/xen_intr.c index c1cb0707cde9..d366a61dc9ec 100644 --- a/sys/x86/xen/xen_intr.c +++ b/sys/x86/xen/xen_intr.c @@ -690,6 +690,8 @@ void xen_intr_alloc_irqs(void) { + if (num_io_irqs > UINT_MAX - NR_EVENT_CHANNELS) + panic("IRQ allocation overflow (num_msi_irqs too high?)"); first_evtchn_irq = num_io_irqs; num_io_irqs += NR_EVENT_CHANNELS; } |