lib/prog_loaders, soc/amd/: Make payload_preload use cbfs_preload

Now that CBFS has this functionality built in, we no longer need to
manually code it.

payload_preload used to use the payload_preload_cache region to store
the raw payload contents. This region was placed outside the firmware
reserved region, so it was available for use by the OS. This was
possible because the payload isn't loaded again on S3 resume.

cbfs_preload only uses the cbfs_cache region. This region must be
reserved because it gets used on the S3 resume path. Unfortunately this
means that cbfs_cache must be increased to hold the payload. Cezanne is
the only platform currently using payload_preload, and the size of
cbfs_cache has already been adjusted.

In the future we could look into adding an option to cbfs_preload that
would allow it to use a different memory pool for the cache allocation.

BUG=b:179699789
TEST=Boot guybrush and verify preloading the payload was successful
CBFS DEBUG: get_preload_rdev(name='fallback/payload') preload successful

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Idc521b238620ff52b8ba481cd3c10e5c4f1394bd
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58962
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>

6 files changed, 9 insertions, 77 deletions

diff --git a/src/include/symbols.h b/src/include/symbols.h
index 52624d4e4c..3e4694b90d 100644
--- a/src/include/symbols.h
+++ b/src/include/symbols.h
@@ -52,7 +52,6 @@ DECLARE_REGION(asan_shadow)
 
 /* Regions for execution units. */
 
-DECLARE_REGION(payload_preload_cache)
 DECLARE_REGION(payload)
 /* "program" always refers to the current execution unit. */
 DECLARE_REGION(program)
diff --git a/src/lib/Kconfig b/src/lib/Kconfig
index 0f184252dc..014230012d 100644
--- a/src/lib/Kconfig
+++ b/src/lib/Kconfig
@@ -114,14 +114,3 @@ config CBFS_PRELOAD
 	  in the background before they are actually required. This feature
 	  depends on the read-only boot_device having a DMA controller to
 	  perform the background transfer.
-
-config PAYLOAD_PRELOAD
-	bool
-	depends on COOP_MULTITASKING
-	help
-	  On some systems with SPI DMA controllers, it is possible to preload
-	  the payload while ramstage is executing. This can be selected by the
-	  SoC to enable payload preloading.
-
-	  The SoC needs to define a payload_preload_cache region where the
-	  raw payload can be placed.
diff --git a/src/lib/prog_loaders.c b/src/lib/prog_loaders.c
index 1a361ea3b9..8ad646a10c 100644
--- a/src/lib/prog_loaders.c
+++ b/src/lib/prog_loaders.c
@@ -127,71 +127,37 @@ fail:
 static struct prog global_payload =
 	PROG_INIT(PROG_PAYLOAD, CONFIG_CBFS_PREFIX "/payload");
 
-static struct thread_handle payload_preload_handle;
-
-static enum cb_err payload_preload_thread_entry(void *arg)
-{
-	size_t size;
-	struct prog *payload = &global_payload;
-
-	printk(BIOS_DEBUG, "Preloading payload\n");
-
-	payload->cbfs_type = CBFS_TYPE_QUERY;
-
-	size = cbfs_type_load(prog_name(payload), _payload_preload_cache,
-			      REGION_SIZE(payload_preload_cache), &payload->cbfs_type);
-
-	if (!size) {
-		printk(BIOS_ERR, "ERROR: Preloading payload failed\n");
-		return CB_ERR;
-	}
-
-	printk(BIOS_DEBUG, "Preloading payload complete\n");
-
-	return CB_SUCCESS;
-}
-
 void payload_preload(void)
 {
-	struct thread_handle *handle = &payload_preload_handle;
-
-	if (!CONFIG(PAYLOAD_PRELOAD))
+	if (!CONFIG(CBFS_PRELOAD))
 		return;
 
-	if (thread_run(handle, payload_preload_thread_entry, NULL))
-		printk(BIOS_ERR, "ERROR: Failed to start payload preload thread\n");
+	cbfs_preload(global_payload.name);
 }
 
 void payload_load(void)
 {
 	struct prog *payload = &global_payload;
-	struct thread_handle *handle = &payload_preload_handle;
-	void *mapping = NULL;
-	void *buffer;
+	void *mapping;
 
 	timestamp_add_now(TS_LOAD_PAYLOAD);
 
 	if (prog_locate_hook(payload))
 		goto out;
 
-	if (CONFIG(PAYLOAD_PRELOAD) && thread_join(handle) == CB_SUCCESS) {
-		buffer = _payload_preload_cache;
-	} else {
-		payload->cbfs_type = CBFS_TYPE_QUERY;
-		mapping = cbfs_type_map(prog_name(payload), NULL, &payload->cbfs_type);
-		buffer = mapping;
-	}
+	payload->cbfs_type = CBFS_TYPE_QUERY;
+	mapping = cbfs_type_map(prog_name(payload), NULL, &payload->cbfs_type);
 
-	if (!buffer)
+	if (!mapping)
 		goto out;
 
 	switch (prog_cbfs_type(payload)) {
 	case CBFS_TYPE_SELF: /* Simple ELF */
-		selfload_mapped(payload, buffer, BM_MEM_RAM);
+		selfload_mapped(payload, mapping, BM_MEM_RAM);
 		break;
 	case CBFS_TYPE_FIT: /* Flattened image tree */
 		if (CONFIG(PAYLOAD_FIT_SUPPORT)) {
-			fit_payload(payload, buffer);
+			fit_payload(payload, mapping);
 			break;
 		} /* else fall-through */
 	default:
@@ -200,8 +166,7 @@ void payload_load(void)
 		break;
 	}
 
-	if (mapping)
-		cbfs_unmap(mapping);
+	cbfs_unmap(mapping);
 out:
 	if (prog_entry(payload) == NULL)
 		die_with_post_code(POST_INVALID_ROM, "Payload not loaded.\n");
diff --git a/src/soc/amd/cezanne/Kconfig b/src/soc/amd/cezanne/Kconfig
index 3fb5085c3b..6c8c3e5dab 100644
--- a/src/soc/amd/cezanne/Kconfig
+++ b/src/soc/amd/cezanne/Kconfig
@@ -197,7 +197,6 @@ config ASYNC_FILE_LOADING
 	select COOP_MULTITASKING
 	select SOC_AMD_COMMON_BLOCK_LPC_SPI_DMA
 	select CBFS_PRELOAD
-	select PAYLOAD_PRELOAD
 	help
 	  When enabled, the platform will use the LPC SPI DMA controller to
 	  asynchronously load contents from the SPI ROM. This will improve
diff --git a/src/soc/amd/common/block/cpu/Kconfig b/src/soc/amd/common/block/cpu/Kconfig
index 3dd1e33056..7f509653b8 100644
--- a/src/soc/amd/common/block/cpu/Kconfig
+++ b/src/soc/amd/common/block/cpu/Kconfig
@@ -29,16 +29,6 @@ config CBFS_CACHE_SIZE
 	help
 	  The size of the cbfs_cache region.
 
-config PAYLOAD_PRELOAD_CACHE_SIZE
-	hex
-	default 0x30000
-	depends on PAYLOAD_PRELOAD
-	help
-	  This config sets the size of the payload_preload_cache memory region.
-	  It is used as the destination for the raw payload. This space is only
-	  populated during non-S3, so it doesn't need to be reserved in the
-	  EARLY_RESERVED_DRAM region.
-
 endif # SOC_AMD_COMMON_BLOCK_NONCAR
 
 config SOC_AMD_COMMON_BLOCK_MCA_COMMON
diff --git a/src/soc/amd/common/block/cpu/noncar/memlayout_x86.ld b/src/soc/amd/common/block/cpu/noncar/memlayout_x86.ld
index a542b7d6ad..e42174f765 100644
--- a/src/soc/amd/common/block/cpu/noncar/memlayout_x86.ld
+++ b/src/soc/amd/common/block/cpu/noncar/memlayout_x86.ld
@@ -106,16 +106,6 @@ SECTIONS
 
 	EARLY_RESERVED_DRAM_END(.)
 
-#if CONFIG(PAYLOAD_PRELOAD)
-        /*
-         * This section is outside the early_reserved_dram section. We only read
-         * the payload on non-S3 boots, so we don't need to reserve it from the
-         * OS. The 64 byte alignment is required by the SPI DMA controller.
-         */
-        . = ALIGN(ARCH_CACHELINE_ALIGN_SIZE);
-        REGION(payload_preload_cache, ., CONFIG_PAYLOAD_PRELOAD_CACHE_SIZE, ARCH_CACHELINE_ALIGN_SIZE)
-#endif
-
 	RAMSTAGE(CONFIG_RAMBASE, 8M)
 }