powerpc/book3s: Flush SLB/TLBs if we get SLB/TLB machine check errors on power7.

If we get a machine check exception due to SLB or TLB errors, then flush
SLBs/TLBs and reload SLBs to recover. We do this in real mode before turning
on MMU. Otherwise we would run into nested machine checks.

If we get a machine check when we are in guest, then just flush the
SLBs and continue. This patch handles errors for power7. The next
patch will handle errors for power8

Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 55d0f9c282b8..c54188bcdd9e 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -73,6 +73,7 @@ extern void __restore_cpu_power8(void);
 extern void __restore_cpu_a2(void);
 extern void __flush_tlb_power7(unsigned long inval_selector);
 extern void __flush_tlb_power8(unsigned long inval_selector);
+extern long __machine_check_early_realmode_p7(struct pt_regs *regs);
 #endif /* CONFIG_PPC64 */
 #if defined(CONFIG_E500)
 extern void __setup_cpu_e5500(unsigned long offset, struct cpu_spec* spec);
@@ -443,6 +444,7 @@ static struct cpu_spec __initdata cpu_specs[] = {
                 .cpu_setup              = __setup_cpu_power7,
                 .cpu_restore            = __restore_cpu_power7,
                 .flush_tlb              = __flush_tlb_power7,
+                .machine_check_early    = __machine_check_early_realmode_p7,
                 .platform               = "power7",
         },
         {       /* 2.07-compliant processor, i.e. Power8 "architected" mode */
@@ -479,6 +481,7 @@ static struct cpu_spec __initdata cpu_specs[] = {
                 .cpu_setup              = __setup_cpu_power7,
                 .cpu_restore            = __restore_cpu_power7,
                 .flush_tlb              = __flush_tlb_power7,
+                .machine_check_early    = __machine_check_early_realmode_p7,
                 .platform               = "power7",
         },
         {       /* Power7+ */
@@ -498,6 +501,7 @@ static struct cpu_spec __initdata cpu_specs[] = {
                 .cpu_setup              = __setup_cpu_power7,
                 .cpu_restore            = __restore_cpu_power7,
                 .flush_tlb              = __flush_tlb_power7,
+                .machine_check_early    = __machine_check_early_realmode_p7,
                 .platform               = "power7+",
         },
         {       /* Power8E */