MIPS: Print CM error reports upon bus errors

If a bus error occurs on a system with a MIPS Coherence Manager (CM)
then the CM may hold useful diagnostic information. Printing this out
has so far been left up to boards, with the requirement that they
register a board_be_handler function & call mips_cm_error_decode() from
there.

In order to avoid boards other than Malta needing to duplicate this
code, call mips_cm_error_decode() automatically if the board registers
no board_be_handler, and remove the Malta implementation of that.

This patch results in no functional change, but removes a further piece
of platform-specific code.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14350/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 3 insertions, 21 deletions

diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index 0c0270c29cd1..1f5fdee1dfc3 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -49,6 +49,7 @@
 #include <asm/fpu.h>
 #include <asm/fpu_emulator.h>
 #include <asm/idle.h>
+#include <asm/mips-cm.h>
 #include <asm/mips-r2-to-r6-emul.h>
 #include <asm/mipsregs.h>
 #include <asm/mipsmtregs.h>
@@ -445,6 +446,8 @@ asmlinkage void do_be(struct pt_regs *regs)
 
         if (board_be_handler)
                 action = board_be_handler(regs, fixup != NULL);
+        else
+                mips_cm_error_report();
 
         switch (action) {
         case MIPS_BE_DISCARD:
diff --git a/arch/mips/mti-malta/malta-int.c b/arch/mips/mti-malta/malta-int.c
index 9f83224292d9..cb675ec6f283 100644
--- a/arch/mips/mti-malta/malta-int.c
+++ b/arch/mips/mti-malta/malta-int.c
@@ -290,18 +290,3 @@ void __init arch_init_irq(void)
 
         setup_irq(corehi_irq, &corehi_irqaction);
 }
-
-void malta_be_init(void)
-{
-        /* Could change CM error mask register. */
-}
-
-int malta_be_handler(struct pt_regs *regs, int is_fixup)
-{
-        /* This duplicates the handling in do_be which seems wrong */
-        int retval = is_fixup ? MIPS_BE_FIXUP : MIPS_BE_FATAL;
-
-        mips_cm_error_report();
-
-        return retval;
-}
diff --git a/arch/mips/mti-malta/malta-setup.c b/arch/mips/mti-malta/malta-setup.c
index f1b6074828b1..a01d5debfcaf 100644
--- a/arch/mips/mti-malta/malta-setup.c
+++ b/arch/mips/mti-malta/malta-setup.c
@@ -42,9 +42,6 @@
 #define ROCIT_CONFIG_GEN0               0x1f403000
 #define  ROCIT_CONFIG_GEN0_PCI_IOCU     BIT(7)
 
-extern void malta_be_init(void);
-extern int malta_be_handler(struct pt_regs *regs, int is_fixup);
-
 static struct resource standard_io_resources[] = {
         {
                 .name = "dma1",
@@ -301,7 +298,4 @@ void __init plat_mem_setup(void)
 #if defined(CONFIG_VT) && defined(CONFIG_VGA_CONSOLE)
         screen_info_setup();
 #endif
-
-        board_be_init = malta_be_init;
-        board_be_handler = malta_be_handler;
 }