linux-kernel - [PATCH] powerpc/8xx: add dedicated machine check handler

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Message-Id: <20160823121556.243EA1A2459@localhost.localdomain>
Date:   Tue, 23 Aug 2016 14:15:56 +0200 (CEST)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Scott Wood <oss@...error.net>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH] powerpc/8xx: add dedicated machine check handler

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/include/asm/cputable.h |  1 +
 arch/powerpc/kernel/cputable.c      |  1 +
 arch/powerpc/kernel/traps.c         | 13 +++++++++++++
 3 files changed, 15 insertions(+)

diff --git a/arch/powerpc/include/asm/cputable.h b/arch/powerpc/include/asm/cputable.h
index 82026b4..863b356 100644
--- a/arch/powerpc/include/asm/cputable.h
+++ b/arch/powerpc/include/asm/cputable.h
@@ -43,6 +43,7 @@ extern int machine_check_e500mc(struct pt_regs *regs);
 extern int machine_check_e500(struct pt_regs *regs);
 extern int machine_check_e200(struct pt_regs *regs);
 extern int machine_check_47x(struct pt_regs *regs);
+extern int machine_check_8xx(struct pt_regs *regs);
 
 extern void cpu_down_flush_e500v2(void);
 extern void cpu_down_flush_e500mc(void);
diff --git a/arch/powerpc/kernel/cputable.c b/arch/powerpc/kernel/cputable.c
index 74248ab..f7bee9e 100644
--- a/arch/powerpc/kernel/cputable.c
+++ b/arch/powerpc/kernel/cputable.c
@@ -1229,6 +1229,7 @@ static struct cpu_spec __initdata cpu_specs[] = {
 		.mmu_features		= MMU_FTR_TYPE_8xx,
 		.icache_bsize		= 16,
 		.dcache_bsize		= 16,
+		.machine_check		= machine_check_8xx,
 		.platform		= "ppc823",
 	},
 #endif /* CONFIG_8xx */
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 2cb5892..37db564 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -664,6 +664,19 @@ int machine_check_e200(struct pt_regs *regs)
 
 	return 0;
 }
+#elif defined(CONFIG_PPC_8xx)
+int machine_check_8xx(struct pt_regs *regs)
+{
+	unsigned long reason = get_mc_reason(regs);
+
+	printk("Machine check in kernel mode.\n");
+	printk("Caused by (from SRR1=%lx): ", reason);
+	if (reason & 0x40000000)
+		printk("Fetch error at address %lx\n", regs->nip);
+	else
+		printk("Data access error at address %lx\n", regs->dar);
+	return 0;
+}
 #else
 int machine_check_generic(struct pt_regs *regs)
 {
-- 
2.1.0