Patch set updated for coreboot: arch/x86: cache postcar in stage cache

[Aaron Durbin]

Aaron Durbin ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17649

-gerrit

commit a8ac92fe424c021b4cd893168dd6671f5eba58ba
Author: Aaron Durbin 
Date:   Tue Nov 29 15:52:08 2016 -0600

arch/x86: cache postcar in stage cache

Stash and reload postcar stage in the stage cache for increased
    S3 resume speed. It's impact is small (2 ms or so), but there's
    no need to go to the boot media on resume to reload something
    that was already loaded. This aligns with the same paths we take
    on ramstage as well.

Change-Id: I4313794826120853163c7366e81346858747ed0a
    Signed-off-by: Aaron Durbin 
---
 src/arch/x86/postcar_loader.c | 28 +++++++++++++++++++++-------
 src/include/stage_cache.h     |  1 +
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/src/arch/x86/postcar_loader.c b/src/arch/x86/postcar_loader.c
index d9719ff..948e445 100644
--- a/src/arch/x86/postcar_loader.c
+++ b/src/arch/x86/postcar_loader.c
@@ -20,6 +20,8 @@
 #include <cpu/x86/mtrr.h>
 #include <program_loading.h>
 #include <rmodule.h>
+#include <romstage_handoff.h>
+#include <stage_cache.h>

static inline void stack_push(struct postcar_frame *pcf, uint32_t val)
 {
@@ -110,18 +112,14 @@ void *postcar_commit_mtrrs(struct postcar_frame *pcf)
    return (void *) pcf->stack;
 }

-void run_postcar_phase(struct postcar_frame *pcf)
+static void load_postcar_cbfs(struct prog *prog, struct postcar_frame *pcf)
 {
-	struct prog prog =
-		PROG_INIT(PROG_UNKNOWN, CONFIG_CBFS_PREFIX "/postcar");
    struct rmod_stage_load rsl = {
    	.cbmem_id = CBMEM_ID_AFTER_CAR,
-		.prog = &prog,
+		.prog = prog,
    };

-	postcar_commit_mtrrs(pcf);
-
-	if (prog_locate(&prog))
+	if (prog_locate(prog))
    	die("Failed to locate after CAR program.\n");
    if (rmodule_stage_load(&rsl))
    	die("Failed to load after CAR program.\n");
@@ -139,5 +137,21 @@ void run_postcar_phase(struct postcar_frame *pcf)
    prog_segment_loaded((uintptr_t)rsl.params, sizeof(uintptr_t),
    	SEG_FINAL);

+	if (!IS_ENABLED(CONFIG_NO_STAGE_CACHE))
+		stage_cache_add(STAGE_POSTCAR, prog);
+}
+
+void run_postcar_phase(struct postcar_frame *pcf)
+{
+	struct prog prog =
+		PROG_INIT(PROG_UNKNOWN, CONFIG_CBFS_PREFIX "/postcar");
+
+	postcar_commit_mtrrs(pcf);
+
+	if (!IS_ENABLED(CONFIG_NO_STAGE_CACHE) && romstage_handoff_is_resume())
+		stage_cache_load_stage(STAGE_POSTCAR, &prog);
+	else
+		load_postcar_cbfs(&prog, pcf);
+
    prog_run(&prog);
 }
diff --git a/src/include/stage_cache.h b/src/include/stage_cache.h
index a24ea71..fbf9c46 100644
--- a/src/include/stage_cache.h
+++ b/src/include/stage_cache.h
@@ -23,6 +23,7 @@
 enum {
    STAGE_RAMSTAGE,
    STAGE_REFCODE,
+	STAGE_POSTCAR,
 };

/* Cache the loaded stage provided according to the parameters. */