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Do not spuriously re-enable disabled io_apic pin on EOI for some configurations.

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If EOI suppression is supported but reported ioapic version is so old
that it does not has EOI register (weird virtualization setup), fix
Intel trick of eoi-ing by flipping pin type (edge/level) to account
for the disabled pin.

Reported by:	Juniper
Reviewed by:	jhb
Sponsored by:	The FreeBSD Foundation
MFC after:	2 weeks
Differential revision:	https://reviews.freebsd.org/D23965
This commit is contained in:
kib 2020-03-18 21:34:52 +00:00
parent a07c223d6d
commit 566a170262
1 changed files with 4 additions and 1 deletions
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5
sys/x86/x86/io_apic.c
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@ -193,8 +193,11 @@ _ioapic_eoi_source(struct intsrc *isrc, int locked)
low1 |= IOART_TRGREDG | IOART_INTMSET;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(src->io_intpin),
low1);
low1 = src->io_lowreg;
if (src->io_masked != 0)
low1 |= IOART_INTMSET;
ioapic_write(io->io_addr, IOAPIC_REDTBL_LO(src->io_intpin),
src->io_lowreg);
low1);
if (!locked)
mtx_unlock_spin(&icu_lock);
}