baytrail: start collecting timestamps

This commit always selects COLLECT_TIMESTAMPS and starts
tracking TSC values from the early stages of bootblock.
The initial timestamp value is saved in mm0 and mm1 while
in bootlbock. This approach works because romcc is not configured
to use mmx registers for its compilation.

Additionally, the romstage api with the mainboard was changed to
always pass around a pointer to a romstage_params structure as the
timestamps are saved in there until ram is up.

BUG=chrome-os-partner:22873
BRANCH=None
TEST=Built and booted with added code to print out timestamps at
     end of ramstage. Everything looks legit.

Change-Id: Iba8d5fff1654afa6471088c46a357474ba533236
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/170950
Reviewed-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: http://review.coreboot.org/4856
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/soc/intel/baytrail/Kconfig

@@ -25,6 +25,7 @@ config CPU_SPECIFIC_OPTIONS
 	select CACHE_MRC_SETTINGS
 	select CACHE_ROM
 	select SPI_FLASH
+	select COLLECT_TIMESTAMPS
 
 config BOOTBLOCK_CPU_INIT
 	string

src/soc/intel/baytrail/Makefile.inc

@@ -1,3 +1,4 @@
+subdirs-y += bootblock
 subdirs-y += microcode
 subdirs-y += romstage
 subdirs-y += ../../../cpu/x86/lapic

src/soc/intel/baytrail/baytrail/romstage.h

@@ -24,16 +24,26 @@
 #error "Don't include romstage.h from a ramstage compilation unit!"
 #endif
 
+#include <stdint.h>
 #include <arch/cpu.h>
 #include <baytrail/mrc_wrapper.h>
 
+#define NUM_ROMSTAGE_TS 4
+struct romstage_timestamps {
+	uint64_t times[NUM_ROMSTAGE_TS];
+	int count;
+};
+
 struct romstage_params {
+	struct romstage_timestamps ts;
+	unsigned long bist;
 	struct mrc_params *mrc_params;
 };
 
-void mainboard_romstage_entry(unsigned long bist);
-void romstage_common(const struct romstage_params *params);
-void * asmlinkage romstage_main(unsigned long bist);
+void mainboard_romstage_entry(struct romstage_params *params);
+void romstage_common(struct romstage_params *params);
+void * asmlinkage romstage_main(unsigned long bist, uint32_t tsc_lo,
+                                uint32_t tsc_high);
 void asmlinkage romstage_after_car(void);
 void raminit(struct mrc_params *mp, int prev_sleep_state);
 void gfx_init(void);

src/soc/intel/baytrail/bootblock/Makefile.inc

@@ -0,0 +1 @@
+chipset_bootblock_inc += $(src)/soc/intel/baytrail/bootblock/timestamp.inc

src/soc/intel/baytrail/bootblock/timestamp.inc

@@ -0,0 +1,18 @@
+/* Store the initial timestamp for booting in mmx registers. This works
+ * because the bootblock isn't being compiled with MMX support so mm0 and
+ * mm1 will be preserved into romstage. */
+	.code32
+
+.global stash_timestamp
+stash_timestamp:
+
+	/* Save the BIST value */
+	movl	%eax, %ebp
+
+	finit
+	rdtsc
+	movd	%eax, %mm0
+	movd	%edx, %mm1
+
+	/* Restore the BIST value to %eax */
+	movl	%ebp, %eax

src/soc/intel/baytrail/romstage/cache_as_ram.inc

@@ -169,6 +169,12 @@ wait_for_sipi:
 	movl	$(CONFIG_DCACHE_RAM_BASE + CONFIG_DCACHE_RAM_SIZE), %eax
 	movl	%eax, %esp
 
+	/* Push the initial TSC value from boot block. The low 32 bits are
+	 * in mm0, and the high 32 bits are in mm1. */
+	movd	%mm1, %eax
+	pushl	%eax
+	movd	%mm0, %eax
+	pushl	%eax
 	/* Restore the BIST result. */
 	movl	%ebp, %eax
 	movl	%esp, %ebp

src/soc/intel/baytrail/romstage/romstage.c

@@ -26,6 +26,7 @@
 #include <cbmem.h>
 #include <cpu/x86/mtrr.h>
 #include <romstage_handoff.h>
+#include <timestamp.h>
 #include <baytrail/gpio.h>
 #include <baytrail/iomap.h>
 #include <baytrail/iosf.h>
@@ -33,6 +34,20 @@
 #include <baytrail/pci_devs.h>
 #include <baytrail/romstage.h>
 
+static inline uint64_t timestamp_get(void)
+{
+	return rdtscll();
+}
+
+static inline tsc_t ts64_to_tsc(uint64_t ts)
+{
+	tsc_t tsc = {
+		.lo = ts,
+		.hi = ts >> 32,
+	};
+	return tsc;
+}
+
 /* The cache-as-ram assembly file calls romstage_main() after setting up
  * cache-as-ram.  romstage_main() will then call the mainboards's
  * mainboard_romstage_entry() function. That function then calls
@@ -69,17 +84,36 @@ static void program_base_addresses(void)
 	pci_write_config32(lpc_dev, GBASE, reg);
 }
 
-/* Entry from cache-as-ram.inc. */
-void * asmlinkage romstage_main(unsigned long bist)
+static inline void mark_ts(struct romstage_params *rp, uint64_t ts)
 {
+	struct romstage_timestamps *rt = &rp->ts;
+
+	rt->times[rt->count] = ts;
+	rt->count++;
+}
+
+/* Entry from cache-as-ram.inc. */
+void * asmlinkage romstage_main(unsigned long bist,
+                                uint32_t tsc_low, uint32_t tsc_hi)
+{
+	struct romstage_params rp = {
+		.bist = bist,
+		.mrc_params = NULL,
+	};
+
+	/* Save initial timestamp from bootblock. */
+	mark_ts(&rp, (((uint64_t)tsc_hi) << 32) | (uint64_t)tsc_low);
+	/* Save romstage begin */
+	mark_ts(&rp, timestamp_get());
+
 	/* Call into mainboard. */
-	mainboard_romstage_entry(bist);
+	mainboard_romstage_entry(&rp);
 
 	return setup_stack_and_mttrs();
 }
 
 /* Entry from the mainboard. */
-void romstage_common(const struct romstage_params *params)
+void romstage_common(struct romstage_params *params)
 {
 	struct romstage_handoff *handoff;
 
@@ -91,15 +125,24 @@ void romstage_common(const struct romstage_params *params)
 
 	gfx_init();
 
+	mark_ts(params, timestamp_get());
+
 	/* Initialize RAM */
 	raminit(params->mrc_params, 5);
 
+	mark_ts(params, timestamp_get());
+
 	handoff = romstage_handoff_find_or_add();
 	if (handoff != NULL)
 		handoff->s3_resume = 0;
 	else
 		printk(BIOS_DEBUG, "Romstage handoff structure not added!\n");
 
+	/* Save timestamp information. */
+	timestamp_init(ts64_to_tsc(params->ts.times[0]));
+	timestamp_add(TS_START_ROMSTAGE, ts64_to_tsc(params->ts.times[1]));
+	timestamp_add(TS_BEFORE_INITRAM, ts64_to_tsc(params->ts.times[2]));
+	timestamp_add(TS_AFTER_INITRAM, ts64_to_tsc(params->ts.times[3]));
 }
 
 static void open_up_spi(void)
@@ -117,6 +160,8 @@ void asmlinkage romstage_after_car(void)
 	/* Allow BIOS to program SPI part. */
 	open_up_spi();
 
+	timestamp_add_now(TS_END_ROMSTAGE);
+
 	/* Load the ramstage. */
 	copy_and_run();
 	while (1);