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powerpc/powernv: Print helpful message when cores guarded

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Often the firmware will guard out cores after a crash. This often
undesirable, and is not immediately noticeable.

This adds an informative message when a CPU device tree nodes are
marked bad in the device tree.

Signed-off-by: Joel Stanley <joel@jms.id.au>
[mpe: Use an eye-catcher that's less likely to get us in trouble]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190801051630.5804-1-joel@jms.id.au
This commit is contained in:
Joel Stanley 2019-08-01 14:46:30 +09:30 committed by Michael Ellerman
parent 8c0d51592f
commit 8f55984f53
1 changed files with 24 additions and 0 deletions
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24
arch/powerpc/platforms/powernv/setup.c
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@ -130,6 +130,28 @@ static void pnv_setup_rfi_flush(void)
setup_count_cache_flush();
}
static void __init pnv_check_guarded_cores(void)
{
struct device_node *dn;
int bad_count = 0;
for_each_node_by_type(dn, "cpu") {
if (of_property_match_string(dn, "status", "bad") >= 0)
bad_count++;
};
if (bad_count) {
printk(" _ _______________\n");
pr_cont(" | | / \\\n");
pr_cont(" | | | WARNING! |\n");
pr_cont(" | | | |\n");
pr_cont(" | | | It looks like |\n");
pr_cont(" |_| | you have %*d |\n", 3, bad_count);
pr_cont(" _ | guarded cores |\n");
pr_cont(" (_) \\_______________/\n");
}
}
static void __init pnv_setup_arch(void)
{
set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
@ -150,6 +172,8 @@ static void __init pnv_setup_arch(void)
/* Enable NAP mode */
powersave_nap = 1;
pnv_check_guarded_cores();
/* XXX PMCS */
}