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arm64: smp: Rework early feature mismatched detection

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Rather than add additional variables to detect specific early feature
mismatches with secondary CPUs, we can instead dedicate the upper bits
of the CPU boot status word to flag specific mismatches.

This allows us to communicate both granule and VA-size mismatches back
to the primary CPU without the need for additional book-keeping.

Tested-by: Steve Capper <steve.capper@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon
2018-12-10 14:21:13 +00:00
parent 68d23da437
commit 66f16a2451
3 changed files with 19 additions and 19 deletions
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11
arch/arm64/kernel/smp.c
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@@ -108,7 +108,6 @@ static int boot_secondary(unsigned int cpu, struct task_struct *idle)
}
static DECLARE_COMPLETION(cpu_running);
bool va52mismatch __ro_after_init;
int __cpu_up(unsigned int cpu, struct task_struct *idle)
{
@@ -138,10 +137,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
if (!cpu_online(cpu)) {
pr_crit("CPU%u: failed to come online\n", cpu);
if (IS_ENABLED(CONFIG_ARM64_USER_VA_BITS_52) && va52mismatch)
pr_crit("CPU%u: does not support 52-bit VAs\n", cpu);
ret = -EIO;
}
} else {
@@ -156,7 +151,7 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
if (status == CPU_MMU_OFF)
status = READ_ONCE(__early_cpu_boot_status);
switch (status) {
switch (status & CPU_BOOT_STATUS_MASK) {
default:
pr_err("CPU%u: failed in unknown state : 0x%lx\n",
cpu, status);
@@ -170,6 +165,10 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
pr_crit("CPU%u: may not have shut down cleanly\n", cpu);
case CPU_STUCK_IN_KERNEL:
pr_crit("CPU%u: is stuck in kernel\n", cpu);
if (status & CPU_STUCK_REASON_52_BIT_VA)
pr_crit("CPU%u: does not support 52-bit VAs\n", cpu);
if (status & CPU_STUCK_REASON_NO_GRAN)
pr_crit("CPU%u: does not support %luK granule \n", cpu, PAGE_SIZE / SZ_1K);
cpus_stuck_in_kernel++;
break;
case CPU_PANIC_KERNEL: