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xtensa: add fairness to IRQ handling

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Track which IRQs have been served at each level to make sure that no IRQ
is served more than once while other IRQs at the same level are pending.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2021-07-09 04:13:23 -07:00
parent ed5aacc81c
commit 43ba223728
1 changed files with 7 additions and 0 deletions
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7
arch/xtensa/kernel/traps.c
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@ -268,6 +268,7 @@ void do_interrupt(struct pt_regs *regs)
XCHAL_INTLEVEL7_MASK,
};
struct pt_regs *old_regs;
unsigned unhandled = ~0u;
trace_hardirqs_off();
@ -283,6 +284,10 @@ void do_interrupt(struct pt_regs *regs)
for (level = LOCKLEVEL; level > 0; --level) {
if (int_at_level & int_level_mask[level]) {
int_at_level &= int_level_mask[level];
if (int_at_level & unhandled)
int_at_level &= unhandled;
else
unhandled |= int_level_mask[level];
break;
}
}
@ -290,6 +295,8 @@ void do_interrupt(struct pt_regs *regs)
if (level == 0)
break;
/* clear lowest pending irq in the unhandled mask */
unhandled ^= (int_at_level & -int_at_level);
do_IRQ(__ffs(int_at_level), regs);
}