msm: smem_log: Use sched_clock() for SMEM Log Timestamp
Most targets use a 32.768KHz RTC clock for the SMEM Log timestamp.
However, this is not available for 8974, so we will switch to using the
sched_clock() which also has the advantage of being able to correlate
APPS SMEM Log items with the kernel log.
CRs-Fixed: 347156
Change-Id: Ia2010a7841bba9425beb737389e45e6b78cb1d89
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
diff --git a/arch/arm/mach-msm/smem_log.c b/arch/arm/mach-msm/smem_log.c
index 5efdc14..2e9a97c 100644
--- a/arch/arm/mach-msm/smem_log.c
+++ b/arch/arm/mach-msm/smem_log.c
@@ -59,10 +59,20 @@
#define D(x...) do {} while (0)
#endif
+/*
+ * Legacy targets use the 32KHz hardware timer and new targets will use
+ * the scheduler timer scaled to a 32KHz tick count.
+ *
+ * As testing on legacy targets permits, we will move them to use
+ * sched_clock() and eventually remove the conditiona compilation.
+ */
#if defined(CONFIG_ARCH_MSM7X30) || defined(CONFIG_ARCH_MSM8X60) \
|| defined(CONFIG_ARCH_FSM9XXX)
#define TIMESTAMP_ADDR (MSM_TMR_BASE + 0x08)
-#else
+#elif defined(CONFIG_ARCH_APQ8064) || defined(CONFIG_ARCH_MSM7X01A) || \
+ defined(CONFIG_ARCH_MSM7x25) || defined(CONFIG_ARCH_MSM7X27) || \
+ defined(CONFIG_ARCH_MSM7X27A) || defined(CONFIG_ARCH_MSM8960) || \
+ defined(CONFIG_ARCH_MSM9615) || defined(CONFIG_ARCH_QSD8X50)
#define TIMESTAMP_ADDR (MSM_TMR_BASE + 0x04)
#endif
@@ -623,6 +633,8 @@
static void init_syms(void) {}
#endif
+#ifdef TIMESTAMP_ADDR
+/* legacy timestamp using 32.768KHz clock */
static inline unsigned int read_timestamp(void)
{
unsigned int tick = 0;
@@ -637,6 +649,18 @@
return tick;
}
+#else
+static inline unsigned int read_timestamp(void)
+{
+ unsigned long long val;
+
+ /* SMEM LOG uses a 32.768KHz timestamp */
+ val = sched_clock() * 32768U;
+ do_div(val, 1000000000U);
+
+ return (unsigned int)val;
+}
+#endif
static void smem_log_event_from_user(struct smem_log_inst *inst,
const char __user *buf, int size, int num)