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powerpc/64s/powernv: machine check dump SLB contents

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Re-use the code introduced in pseries to save and dump the contents
of the SLB in the case of an SLB involved machine check exception.

This patch also avoids allocating the SLB save array on pseries radix.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190802105709.27696-9-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2019-08-02 20:56:33 +10:00 committed by Michael Ellerman
parent 0b66370c61
commit 7290f3b3d3
4 changed files with 31 additions and 10 deletions
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6
arch/powerpc/kernel/mce.c
View File

@ -511,6 +511,12 @@ void machine_check_print_event_info(struct machine_check_event *evt,
subtype = evt->error_class < ARRAY_SIZE(mc_error_class) ?
mc_error_class[evt->error_class] : "Unknown";
printk("%sMCE: CPU%d: %s\n", level, evt->cpu, subtype);
#ifdef CONFIG_PPC_BOOK3S_64
/* Display faulty slb contents for SLB errors. */
if (evt->error_type == MCE_ERROR_TYPE_SLB)
slb_dump_contents(local_paca->mce_faulty_slbs);
#endif
}
EXPORT_SYMBOL_GPL(machine_check_print_event_info);

4
arch/powerpc/kernel/mce_power.c
View File

@ -405,6 +405,8 @@ static int mce_handle_ierror(struct pt_regs *regs,
/* attempt to correct the error */
switch (table[i].error_type) {
case MCE_ERROR_TYPE_SLB:
if (local_paca->in_mce == 1)
slb_save_contents(local_paca->mce_faulty_slbs);
handled = mce_flush(MCE_FLUSH_SLB);
break;
case MCE_ERROR_TYPE_ERAT:
@ -490,6 +492,8 @@ static int mce_handle_derror(struct pt_regs *regs,
/* attempt to correct the error */
switch (table[i].error_type) {
case MCE_ERROR_TYPE_SLB:
if (local_paca->in_mce == 1)
slb_save_contents(local_paca->mce_faulty_slbs);
if (mce_flush(MCE_FLUSH_SLB))
handled = 1;
break;

9
arch/powerpc/platforms/powernv/setup.c
View File

@ -24,6 +24,7 @@
#include <linux/bug.h>
#include <linux/pci.h>
#include <linux/cpufreq.h>
#include <linux/memblock.h>
#include <asm/machdep.h>
#include <asm/firmware.h>
@ -166,6 +167,14 @@ static void __init pnv_init(void)
else
#endif
add_preferred_console("hvc", 0, NULL);
if (!radix_enabled()) {
int i;
/* Allocate per cpu area to save old slb contents during MCE */
for_each_possible_cpu(i)
paca_ptrs[i]->mce_faulty_slbs = memblock_alloc_node(mmu_slb_size, __alignof__(*paca_ptrs[i]->mce_faulty_slbs), cpu_to_node(i));
}
}
static void __init pnv_init_IRQ(void)

10
arch/powerpc/platforms/pseries/setup.c
View File

@ -142,17 +142,19 @@ static void __init fwnmi_init(void)
}
#ifdef CONFIG_PPC_BOOK3S_64
/* Allocate per cpu slb area to save old slb contents during MCE */
if (!radix_enabled()) {
/* Allocate per cpu area to save old slb contents during MCE */
size = sizeof(struct slb_entry) * mmu_slb_size * nr_cpus;
slb_ptr = memblock_alloc_try_nid_raw(size, sizeof(struct slb_entry),
MEMBLOCK_LOW_LIMIT, ppc64_rma_size,
NUMA_NO_NODE);
slb_ptr = memblock_alloc_try_nid_raw(size,
sizeof(struct slb_entry), MEMBLOCK_LOW_LIMIT,
ppc64_rma_size, NUMA_NO_NODE);
if (!slb_ptr)
panic("Failed to allocate %zu bytes below %pa for slb area\n",
size, &ppc64_rma_size);
for_each_possible_cpu(i)
paca_ptrs[i]->mce_faulty_slbs = slb_ptr + (mmu_slb_size * i);
}
#endif
}