drivers: apanic_mmc: write panic information to raw MMC partition

This patch is created based on the following changes:

* (CR) apanic_mmc: support writing panic data to
  raw MMC partition
  Reviewed-on: http://gerrit.pcs.mot.com/342283

* (CR): fix no apanic_threads issue
  Reviewed-on: http://gerrit.pcs.mot.com/377655

* (CR) Porting omap split apanic_threads to qcom
  Reviewed-on: http://gerrit.pcs.mot.com/377659

* (CR): Support apanic dump ftrace buffer no
  more than 512k
  Reviewed-on: http://gerrit.pcs.mot.com/377664

* (CR): port apanic annotations from AP20
  Reviewed-on: http://gerrit.pcs.mot.com/392744

* (CR): apanic: add read support to user space
  annotations
  Reviewed-on: http://gerrit.pcs.mot.com/400182

* (CR) Fix potential watchdog reset on emmc kernel
  panic failure for qcom platform.
  Reviewed-on: http://gerrit.pcs.mot.com/404849

Change-Id: Ice455ee53448f05d6d252ab4378963d1cbd01443
Signed-off-by: Yi-wei Zhao <gbjc64@motorola.com>
Reviewed-on: http://gerrit.pcs.mot.com/503768Tested-by: Jira Key <JIRAKEY@motorola.com>
Reviewed-by: Jason Hrycay <jason.hrycay@motorola.com>
(cherry picked from commit eeef74de)
Signed-off-by: Jeffrey Carlyle <jeff.carlyle@motorola.com>

drivers/misc/Kconfig

@@ -542,6 +542,29 @@ config WL127X_RFKILL
 	 Creates an rfkill entry in sysfs for power control of Bluetooth
 	 TI wl127x chips.
 
+config APANIC_MMC
+	bool "Android kernel panic diagnostics driver on mmc"
+	default n
+	---help---
+	 Driver which handles kernel panics and attempts to write
+	 critical debugging data through mmc.
+
+config APANIC_MMC_MEMDUMP
+	bool "Android memory dump driver on mmc"
+	depends on APANIC_MMC
+	default n
+	---help---
+	 Driver which handles kernel panics and attempts to write
+	 full memory dump through mmc.
+
+config APANIC_PLABEL
+	string "Android panic dump flash partition label"
+	depends on APANIC_MMC
+	default "kpanic"
+	---help---
+	 If your platform uses a different flash partition label for storing
+ 	 crashdumps, enter it here.
+
 config TSIF
 	depends on ARCH_MSM8X60 || ARCH_MSM8960 || ARCH_APQ8064
 	tristate "TSIF (Transport Stream InterFace) support"

drivers/misc/Makefile

@@ -54,6 +54,7 @@ obj-$(CONFIG_MAX8997_MUIC)	+= max8997-muic.o
 obj-$(CONFIG_WL127X_RFKILL)	+= wl127x-rfkill.o
 obj-$(CONFIG_SENSORS_AK8975)	+= akm8975.o
 obj-$(CONFIG_SENSORS_MSP430)	+= msp430.o
+obj-$(CONFIG_APANIC_MMC)	+= apanic_mmc.o
 obj-$(CONFIG_TSIF) += msm_tsif.o
 obj-$(CONFIG_VIB_TIMED)		+= vib-timed.o
 msm_tsif-objs := tsif.o

include/linux/apanic_mmc.h

+/*
+ * include/linux/apanic_mmc.h
+ *
+ * Copyright 2012 Motorola Mobility LLC .
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __LINUX_APANIC_MMC_H__
+#define __LINUX_APANIC_MMC_H__
+
+#include <linux/genhd.h>
+
+#ifdef __KERNEL__
+
+struct raw_mmc_panic_ops {
+	int type;      /* MMC, SD, SDIO on the fly */
+	int (*panic_probe)(struct hd_struct *hd, int type);
+	int (*panic_write)(struct hd_struct *hd, char *buf,
+			unsigned int offset, unsigned int len);
+	int (*panic_erase)(struct hd_struct *hd, unsigned int offset,
+			unsigned int len);
+};
+
+#ifdef CONFIG_APANIC_MMC
+int is_apanic_threads_dump(void);
+int is_emergency_dump(void);
+void emergency_dump(void);
+void apanic_mmc_partition_add(struct hd_struct *part);
+void apanic_mmc_partition_remove(struct hd_struct *part);
+int apanic_mmc_annotate(const char *annotation);
+
+int __init apanic_mmc_init(struct raw_mmc_panic_ops *panic_ops);
+#else
+static inline int is_apanic_threads_dump(void) { return 0; }
+static inline int is_emergency_dump(void) { return 0; }
+static inline void emergency_dump(void) {}
+static inline void apanic_mmc_partition_add(struct hd_struct *part) {}
+static inline void apanic_mmc_partition_remove(struct hd_struct *part) {}
+static inline int apanic_mmc_annotate(const char *annotation) { return 0; }
+
+static inline int apanic_mmc_init(struct raw_mmc_panic_ops *panic_ops)
+{
+	return 0;
+}
+#endif /* CONFIG_APANIC_MMC */
+
+#endif /* __KERNEL__ */
+
+#endif /* __LINUX_APANIC_MMC_H__ */