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irqchip/gic-v3: Reset APgRn registers at boot time

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Booting a crash kernel while in an interrupt handler is likely
to leave the Active Priority Registers with some state that
is not relevant to the new kernel, and is likely to lead
to erratic behaviours such as interrupts not firing as their
priority is already active.

As a sanity measure, wipe the APRs clean on startup. We make
sure to wipe both group 0 and 1 registers in order to avoid
any surprise.

Signed-off-by: Marc Zyngier <[email protected]>
This commit is contained in:
Marc Zyngier 2018-03-09 14:53:19 +00:00
commit d6062a6d62
2 changed files with 54 additions and 10 deletions
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23
drivers/irqchip/irq-gic-v3.c
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@ -532,6 +532,7 @@ static void gic_cpu_sys_reg_init(void)
int i, cpu = smp_processor_id();
u64 mpidr = cpu_logical_map(cpu);
u64 need_rss = MPIDR_RS(mpidr);
u32 val;
/*
* Need to check that the SRE bit has actually been set. If
@ -562,6 +563,28 @@ static void gic_cpu_sys_reg_init(void)
gic_write_ctlr(ICC_CTLR_EL1_EOImode_drop_dir);
}
val = gic_read_ctlr();
val &= ICC_CTLR_EL1_PRI_BITS_MASK;
val >>= ICC_CTLR_EL1_PRI_BITS_SHIFT;
switch(val + 1) {
case 8:
case 7:
write_gicreg(0, ICC_AP0R3_EL1);
write_gicreg(0, ICC_AP1R3_EL1);
write_gicreg(0, ICC_AP0R2_EL1);
write_gicreg(0, ICC_AP1R2_EL1);
case 6:
write_gicreg(0, ICC_AP0R1_EL1);
write_gicreg(0, ICC_AP1R1_EL1);
case 5:
case 4:
write_gicreg(0, ICC_AP0R0_EL1);
write_gicreg(0, ICC_AP1R0_EL1);
}
isb();
/* ... and let's hit the road... */
gic_write_grpen1(1);