Merge branch 'master' into for-next

1 files changed, 69 insertions, 33 deletions

diff --git a/arch/powerpc/platforms/pseries/ras.c b/arch/powerpc/platforms/pseries/ras.c
index a4fc6da87c2e..c55d7ad9c648 100644
--- a/arch/powerpc/platforms/pseries/ras.c
+++ b/arch/powerpc/platforms/pseries/ras.c
@@ -54,7 +54,8 @@
 static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX];
 static DEFINE_SPINLOCK(ras_log_buf_lock);
 
-static char mce_data_buf[RTAS_ERROR_LOG_MAX];
+static char global_mce_data_buf[RTAS_ERROR_LOG_MAX];
+static DEFINE_PER_CPU(__u64, mce_data_buf);
 
 static int ras_get_sensor_state_token;
 static int ras_check_exception_token;
@@ -196,12 +197,24 @@ static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-/* Get the error information for errors coming through the
+/*
+ * Some versions of FWNMI place the buffer inside the 4kB page starting at
+ * 0x7000. Other versions place it inside the rtas buffer. We check both.
+ */
+#define VALID_FWNMI_BUFFER(A) \
+	((((A) >= 0x7000) && ((A) < 0x7ff0)) || \
+	(((A) >= rtas.base) && ((A) < (rtas.base + rtas.size - 16))))
+
+/*
+ * Get the error information for errors coming through the
  * FWNMI vectors.  The pt_regs' r3 will be updated to reflect
  * the actual r3 if possible, and a ptr to the error log entry
  * will be returned if found.
  *
- * The mce_data_buf does not have any locks or protection around it,
+ * If the RTAS error is not of the extended type, then we put it in a per
+ * cpu 64bit buffer. If it is the extended type we use global_mce_data_buf.
+ *
+ * The global_mce_data_buf does not have any locks or protection around it,
  * if a second machine check comes in, or a system reset is done
  * before we have logged the error, then we will get corruption in the
  * error log.  This is preferable over holding off on calling
@@ -210,20 +223,31 @@ static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
  */
 static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs)
 {
-	unsigned long errdata = regs->gpr[3];
-	struct rtas_error_log *errhdr = NULL;
 	unsigned long *savep;
+	struct rtas_error_log *h, *errhdr = NULL;
+
+	if (!VALID_FWNMI_BUFFER(regs->gpr[3])) {
+		printk(KERN_ERR "FWNMI: corrupt r3\n");
+		return NULL;
+	}
 
-	if ((errdata >= 0x7000 && errdata < 0x7fff0) ||
-	    (errdata >= rtas.base && errdata < rtas.base + rtas.size - 16)) {
-		savep = __va(errdata);
-		regs->gpr[3] = savep[0];	/* restore original r3 */
-		memset(mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
-		memcpy(mce_data_buf, (char *)(savep + 1), RTAS_ERROR_LOG_MAX);
-		errhdr = (struct rtas_error_log *)mce_data_buf;
+	savep = __va(regs->gpr[3]);
+	regs->gpr[3] = savep[0];	/* restore original r3 */
+
+	/* If it isn't an extended log we can use the per cpu 64bit buffer */
+	h = (struct rtas_error_log *)&savep[1];
+	if (!h->extended) {
+		memcpy(&__get_cpu_var(mce_data_buf), h, sizeof(__u64));
+		errhdr = (struct rtas_error_log *)&__get_cpu_var(mce_data_buf);
 	} else {
-		printk("FWNMI: corrupt r3\n");
+		int len;
+
+		len = max_t(int, 8+h->extended_log_length, RTAS_ERROR_LOG_MAX);
+		memset(global_mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
+		memcpy(global_mce_data_buf, h, len);
+		errhdr = (struct rtas_error_log *)global_mce_data_buf;
 	}
+
 	return errhdr;
 }
 
@@ -235,7 +259,7 @@ static void fwnmi_release_errinfo(void)
 {
 	int ret = rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL);
 	if (ret != 0)
-		printk("FWNMI: nmi-interlock failed: %d\n", ret);
+		printk(KERN_ERR "FWNMI: nmi-interlock failed: %d\n", ret);
 }
 
 int pSeries_system_reset_exception(struct pt_regs *regs)
@@ -259,31 +283,43 @@ int pSeries_system_reset_exception(struct pt_regs *regs)
  * Return 1 if corrected (or delivered a signal).
  * Return 0 if there is nothing we can do.
  */
-static int recover_mce(struct pt_regs *regs, struct rtas_error_log * err)
+static int recover_mce(struct pt_regs *regs, struct rtas_error_log *err)
 {
-	int nonfatal = 0;
+	int recovered = 0;
 
-	if (err->disposition == RTAS_DISP_FULLY_RECOVERED) {
+	if (!(regs->msr & MSR_RI)) {
+		/* If MSR_RI isn't set, we cannot recover */
+		recovered = 0;
+
+	} else if (err->disposition == RTAS_DISP_FULLY_RECOVERED) {
 		/* Platform corrected itself */
-		nonfatal = 1;
-	} else if ((regs->msr & MSR_RI) &&
-		   user_mode(regs) &&
-		   err->severity == RTAS_SEVERITY_ERROR_SYNC &&
-		   err->disposition == RTAS_DISP_NOT_RECOVERED &&
-		   err->target == RTAS_TARGET_MEMORY &&
-		   err->type == RTAS_TYPE_ECC_UNCORR &&
-		   !(current->pid == 0 || is_global_init(current))) {
-		/* Kill off a user process with an ECC error */
-		printk(KERN_ERR "MCE: uncorrectable ecc error for pid %d\n",
-		       current->pid);
-		/* XXX something better for ECC error? */
-		_exception(SIGBUS, regs, BUS_ADRERR, regs->nip);
-		nonfatal = 1;
+		recovered = 1;
+
+	} else if (err->disposition == RTAS_DISP_LIMITED_RECOVERY) {
+		/* Platform corrected itself but could be degraded */
+		printk(KERN_ERR "MCE: limited recovery, system may "
+		       "be degraded\n");
+		recovered = 1;
+
+	} else if (user_mode(regs) && !is_global_init(current) &&
+		   err->severity == RTAS_SEVERITY_ERROR_SYNC) {
+
+		/*
+		 * If we received a synchronous error when in userspace
+		 * kill the task. Firmware may report details of the fail
+		 * asynchronously, so we can't rely on the target and type
+		 * fields being valid here.
+		 */
+		printk(KERN_ERR "MCE: uncorrectable error, killing task "
+		       "%s:%d\n", current->comm, current->pid);
+
+		_exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
+		recovered = 1;
 	}
 
-	log_error((char *)err, ERR_TYPE_RTAS_LOG, !nonfatal);
+	log_error((char *)err, ERR_TYPE_RTAS_LOG, 0);
 
-	return nonfatal;
+	return recovered;
 }
 
 /*