[POWERPC] pasemi: Machine check handler

Print out decoded machine check information on PA6T.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 43 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pasemi/setup.c b/arch/powerpc/platforms/pasemi/setup.c
index 0505dd884ae..4142873a87e 100644
--- a/arch/powerpc/platforms/pasemi/setup.c
+++ b/arch/powerpc/platforms/pasemi/setup.c
@@ -147,6 +147,48 @@ static void __init pas_progress(char *s, unsigned short hex)
 }
 
 
+static int pas_machine_check_handler(struct pt_regs *regs)
+{
+        int cpu = smp_processor_id();
+        unsigned long srr0, srr1, dsisr;
+
+        srr0 = regs->nip;
+        srr1 = regs->msr;
+        dsisr = mfspr(SPRN_DSISR);
+        printk(KERN_ERR "Machine Check on CPU %d\n", cpu);
+        printk(KERN_ERR "SRR0 0x%016lx SRR1 0x%016lx\n", srr0, srr1);
+        printk(KERN_ERR "DSISR 0x%016lx DAR 0x%016lx\n", dsisr, regs->dar);
+        printk(KERN_ERR "Cause:\n");
+
+        if (srr1 & 0x200000)
+                printk(KERN_ERR "Signalled by SDC\n");
+        if (srr1 & 0x100000) {
+                printk(KERN_ERR "Load/Store detected error:\n");
+                if (dsisr & 0x8000)
+                        printk(KERN_ERR "D-cache ECC double-bit error or bus error\n");
+                if (dsisr & 0x4000)
+                        printk(KERN_ERR "LSU snoop response error\n");
+                if (dsisr & 0x2000)
+                        printk(KERN_ERR "MMU SLB multi-hit or invalid B field\n");
+                if (dsisr & 0x1000)
+                        printk(KERN_ERR "Recoverable Duptags\n");
+                if (dsisr & 0x800)
+                        printk(KERN_ERR "Recoverable D-cache parity error count overflow\n");
+                if (dsisr & 0x400)
+                        printk(KERN_ERR "TLB parity error count overflow\n");
+        }
+        if (srr1 & 0x80000)
+                printk(KERN_ERR "Bus Error\n");
+        if (srr1 & 0x40000)
+                printk(KERN_ERR "I-side SLB multiple hit\n");
+        if (srr1 & 0x20000)
+                printk(KERN_ERR "I-cache parity error hit\n");
+
+        /* SRR1[62] is from MSR[62] if recoverable, so pass that back */
+        return !!(srr1 & 0x2);
+}
+
+
 /*
  * Called very early, MMU is off, device-tree isn't unflattened
  */
@@ -175,4 +217,5 @@ define_machine(pas) {
         .calibrate_decr         = generic_calibrate_decr,
         .check_legacy_ioport    = pas_check_legacy_ioport,
         .progress               = pas_progress,
+        .machine_check_exception = pas_machine_check_handler,
 };