powerpc/fsl_rio: move machine_check handler

Add support for machine_check support into machine_check_e500 and
machine_check_e500mc.

Signed-off-by: Shaohui Xie <b21989@freescale.com>
Cc: Li Yang <leoli@freescale.com>
Cc: Roy Zang <tie-fei.zang@freescale.com>
Cc: Alexandre Bounine <alexandre.bounine@idt.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

3 files changed, 21 insertions, 12 deletions

diff --git a/arch/powerpc/include/asm/rio.h b/arch/powerpc/include/asm/rio.h
index 0018bf80cb25..d902abd33995 100644
--- a/arch/powerpc/include/asm/rio.h
+++ b/arch/powerpc/include/asm/rio.h
@@ -14,5 +14,10 @@
 #define ASM_PPC_RIO_H
 
 extern void platform_rio_init(void);
+#ifdef CONFIG_RAPIDIO
+extern int fsl_rio_mcheck_exception(struct pt_regs *);
+#else
+static inline int fsl_rio_mcheck_exception(struct pt_regs *regs) {return 0; }
+#endif
 
 #endif                          /* ASM_PPC_RIO_H */
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index b13306b0d925..0ff4ab98d50c 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -55,6 +55,7 @@
 #endif
 #include <asm/kexec.h>
 #include <asm/ppc-opcode.h>
+#include <asm/rio.h>
 
 #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC)
 int (*__debugger)(struct pt_regs *regs) __read_mostly;
@@ -424,6 +425,12 @@ int machine_check_e500mc(struct pt_regs *regs)
         unsigned long reason = mcsr;
         int recoverable = 1;
 
+        if (reason & MCSR_BUS_RBERR) {
+                recoverable = fsl_rio_mcheck_exception(regs);
+                if (recoverable == 1)
+                        goto silent_out;
+        }
+
         printk("Machine check in kernel mode.\n");
         printk("Caused by (from MCSR=%lx): ", reason);
 
@@ -499,6 +506,7 @@ int machine_check_e500mc(struct pt_regs *regs)
                        reason & MCSR_MEA ? "Effective" : "Physical", addr);
         }
 
+silent_out:
         mtspr(SPRN_MCSR, mcsr);
         return mfspr(SPRN_MCSR) == 0 && recoverable;
 }
@@ -507,6 +515,11 @@ int machine_check_e500(struct pt_regs *regs)
 {
         unsigned long reason = get_mc_reason(regs);
 
+        if (reason & MCSR_BUS_RBERR) {
+                if (fsl_rio_mcheck_exception(regs))
+                        return 1;
+        }
+
         printk("Machine check in kernel mode.\n");
         printk("Caused by (from MCSR=%lx): ", reason);
 
diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index 49798532b477..34440e1bac18 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -260,9 +260,7 @@ struct rio_priv {
 static void __iomem *rio_regs_win;
 
 #ifdef CONFIG_E500
-static int (*saved_mcheck_exception)(struct pt_regs *regs);
-
-static int fsl_rio_mcheck_exception(struct pt_regs *regs)
+int fsl_rio_mcheck_exception(struct pt_regs *regs)
 {
         const struct exception_table_entry *entry = NULL;
         unsigned long reason = mfspr(SPRN_MCSR);
@@ -284,11 +282,9 @@ static int fsl_rio_mcheck_exception(struct pt_regs *regs)
                 }
         }
 
-        if (saved_mcheck_exception)
-                return saved_mcheck_exception(regs);
-        else
-                return cur_cpu_spec->machine_check(regs);
+        return 0;
 }
+EXPORT_SYMBOL_GPL(fsl_rio_mcheck_exception);
 #endif
 
 /**
@@ -1538,11 +1534,6 @@ int fsl_rio_setup(struct platform_device *dev)
         fsl_rio_doorbell_init(port);
         fsl_rio_port_write_init(port);
 
-#ifdef CONFIG_E500
-        saved_mcheck_exception = ppc_md.machine_check_exception;
-        ppc_md.machine_check_exception = fsl_rio_mcheck_exception;
-#endif
-
         return 0;
 err:
         iounmap(priv->regs_win);