powerpc/book3s: Introduce a early machine check hook in cpu_spec.

This patch adds the early machine check function pointer in cputable for
CPU specific early machine check handling. The early machine handle routine
will be called in real mode to handle SLB and TLB errors. We can not reuse
the existing machine_check hook because it is always invoked in kernel
virtual mode and we would already be in trouble if we get SLB or TLB errors.
This patch just sets up a mechanism to invoke CPU specific handler. The
subsequent patches will populate the function pointer.

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

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index 0d4939b..c5b107a 100644 (file)
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -90,6 +90,13 @@ struct cpu_spec {
         * if the error is fatal, 1 if it was fully recovered and 0 to
         * pass up (not CPU originated) */
        int             (*machine_check)(struct pt_regs *regs);
+
+       /*
+        * Processor specific early machine check handler which is
+        * called in real mode to handle SLB and TLB errors.
+        */
+       long            (*machine_check_early)(struct pt_regs *regs);
+
 };
 
 extern struct cpu_spec         *cur_cpu_spec;

diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 97a1ce7..3308417 100644 (file)
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -293,8 +293,11 @@ void system_reset_exception(struct pt_regs *regs)
  */
 long machine_check_early(struct pt_regs *regs)
 {
-       /* TODO: handle/decode machine check reason */
-       return 0;
+       long handled = 0;
+
+       if (cur_cpu_spec && cur_cpu_spec->machine_check_early)
+               handled = cur_cpu_spec->machine_check_early(regs);
+       return handled;
 }
 
 #endif