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>

Author: paulburton

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:

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;
-}

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;
 }