disp: msm: sde: save register write logs in dump

Changes are made to add register write logs to memory dump.
This can be extracted from crash dumps and used for analysis.

Change-Id: If46aaa4ae68f83c79d4b51cbe5dfd22340aa991d
Signed-off-by: Yashwanth <yvulapu@codeaurora.org>

msm/sde_dbg.h

@@ -72,6 +72,34 @@ enum sde_dbg_dump_context {
 	SDE_DBG_DUMP_CLK_ENABLED_CTX,
 };
 
+/*
+ * Define blocks for register write logging.
+ */
+#define SDE_REG_LOG_DEFAULT  0
+#define SDE_REG_LOG_NONE     1
+#define SDE_REG_LOG_CDM      2
+#define SDE_REG_LOG_DSPP     3
+#define SDE_REG_LOG_INTF     4
+#define SDE_REG_LOG_LM       5
+#define SDE_REG_LOG_CTL      6
+#define SDE_REG_LOG_PINGPONG 7
+#define SDE_REG_LOG_SSPP     8
+#define SDE_REG_LOG_WB       9
+#define SDE_REG_LOG_TOP     10
+#define SDE_REG_LOG_VBIF    11
+#define SDE_REG_LOG_DSC     12
+#define SDE_REG_LOG_ROT     13
+#define SDE_REG_LOG_DS      14
+#define SDE_REG_LOG_REGDMA  15
+#define SDE_REG_LOG_UIDLE   16
+#define SDE_REG_LOG_SID     16
+#define SDE_REG_LOG_QDSS    17
+/*
+ * 0-32 are reserved for sde_reg_write due to log masks
+ * Additional blocks are assigned from 33 to avoid conflict
+ */
+#define SDE_REG_LOG_RSCC    33
+
 #define SDE_EVTLOG_DEFAULT_ENABLE (SDE_EVTLOG_CRITICAL | SDE_EVTLOG_IRQ | \
 		SDE_EVTLOG_EXTERNAL)
 
@@ -126,6 +154,44 @@ struct sde_dbg_evtlog {
 
 extern struct sde_dbg_evtlog *sde_dbg_base_evtlog;
 
+/*
+ * reglog keeps this number of entries in memory for debug purpose. This
+ * number must be greater than number of possible writes in at least one
+ * single commit.
+ */
+#define SDE_REGLOG_ENTRY 1024
+
+struct sde_dbg_reglog_log {
+	s64 time;
+	u32 pid;
+	u32 addr;
+	u32 val;
+	u8 blk_id;
+};
+
+/**
+ * @last_dump: Index of last entry to be output during reglog dumps
+ * @filter_list: Linked list of currently active filter strings
+ */
+struct sde_dbg_reglog {
+	struct sde_dbg_reglog_log logs[SDE_REGLOG_ENTRY];
+	u32 first;
+	u32 last;
+	u32 last_dump;
+	u32 curr;
+	u32 next;
+	u32 enable;
+	u32 enable_mask;
+	spinlock_t spin_lock;
+};
+
+extern struct sde_dbg_reglog *sde_dbg_base_reglog;
+
+/**
+ * SDE_REG_LOG - Write register write to the register log
+ */
+#define SDE_REG_LOG(blk_id, val, addr) sde_reglog_log(blk_id, val, addr)
+
 /**
  * SDE_EVT32 - Write a list of 32bit values to the event log, default area
  * ... - variable arguments
@@ -207,6 +273,12 @@ extern struct sde_dbg_evtlog *sde_dbg_base_evtlog;
  */
 struct sde_dbg_evtlog *sde_evtlog_init(void);
 
+/**
+ * sde_reglog_init - allocate a new reg log object
+ * Returns:	reglog or -ERROR
+ */
+struct sde_dbg_reglog *sde_reglog_init(void);
+
 /**
  * sde_evtlog_destroy - destroy previously allocated event log
  * @evtlog:	pointer to evtlog
@@ -214,6 +286,13 @@ struct sde_dbg_evtlog *sde_evtlog_init(void);
  */
 void sde_evtlog_destroy(struct sde_dbg_evtlog *evtlog);
 
+/**
+ * sde_reglog_destroy - destroy previously allocated reg log
+ * @reglog:	pointer to reglog
+ * Returns:	none
+ */
+void sde_reglog_destroy(struct sde_dbg_reglog *reglog);
+
 /**
  * sde_evtlog_log - log an entry into the event log.
  *	log collection may be enabled/disabled entirely via debugfs
@@ -227,6 +306,15 @@ void sde_evtlog_destroy(struct sde_dbg_evtlog *evtlog);
 void sde_evtlog_log(struct sde_dbg_evtlog *evtlog, const char *name, int line,
 		int flag, ...);
 
+/**
+ * sde_reglog_log - log an entry into the reg log.
+ *      log collection may be enabled/disabled entirely via debugfs
+ *      log area collection may be filtered by user provided flags via debugfs.
+ * @reglog:     pointer to evtlog
+ * Returns:     none
+ */
+void sde_reglog_log(u8 blk_id, u32 val, u32 addr);
+
 /**
  * sde_evtlog_dump_all - print all entries in event log to kernel log
  * @evtlog:	pointer to evtlog