src/cpu,soc/amd/common/block/cpu: Add preload_microcode
This will enable preloading the microcode. By preloading the
file, into cbfs_cache we reduce boot time.
BUG=b:179699789
TEST=Boot guybrush with CL chain and see microcode preloading and a
reduction of 1 ms.
| 112 - started reading uCode | 1.041 | 1.204 Δ( 0.16, 0.01%) |
| 113 - finished reading uCode | 1.365 | 0.011 Δ( -1.35, -0.10%) |
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: If0c634c692c97769e71acd1175fc464dc592c356
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58963
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>
diff --git a/src/cpu/Makefile.inc b/src/cpu/Makefile.inc
index ec2f19f..9f1e6c4 100644
--- a/src/cpu/Makefile.inc
+++ b/src/cpu/Makefile.inc
@@ -56,7 +56,12 @@
cpu_microcode_blob.bin-file ?= $(obj)/cpu_microcode_blob.bin
cpu_microcode_blob.bin-type := microcode
+# The AMD LPC SPI DMA controller requires source files to be 64 byte aligned.
+ifeq ($(CONFIG_SOC_AMD_COMMON_BLOCK_LPC_SPI_DMA),y)
+cpu_microcode_blob.bin-align := 64
+else
cpu_microcode_blob.bin-align := 16
+endif
ifneq ($(CONFIG_CPU_MICROCODE_CBFS_LOC),)
cpu_microcode_blob.bin-COREBOOT-position := $(CONFIG_CPU_MICROCODE_CBFS_LOC)
diff --git a/src/include/cpu/amd/microcode.h b/src/include/cpu/amd/microcode.h
index 800661b..7407594 100644
--- a/src/include/cpu/amd/microcode.h
+++ b/src/include/cpu/amd/microcode.h
@@ -2,5 +2,6 @@
#define CPU_AMD_MICROCODE_H
void amd_update_microcode_from_cbfs(void);
+void preload_microcode(void);
#endif /* CPU_AMD_MICROCODE_H */
diff --git a/src/soc/amd/common/block/cpu/update_microcode.c b/src/soc/amd/common/block/cpu/update_microcode.c
index e6a57f5..33b244d 100644
--- a/src/soc/amd/common/block/cpu/update_microcode.c
+++ b/src/soc/amd/common/block/cpu/update_microcode.c
@@ -10,6 +10,8 @@
#include <cbfs.h>
#include <timestamp.h>
+#define CPU_MICROCODE_BLOB_NAME "cpu_microcode_blob.bin"
+
_Static_assert(CONFIG_SOC_AMD_COMMON_BLOCK_UCODE_SIZE > 0,
"SOC_AMD_COMMON_BLOCK_UCODE_SIZE is not set");
@@ -97,9 +99,10 @@
/* Cache the buffer so each CPU doesn't need to read the uCode from flash */
if (!cache_valid) {
timestamp_add_now(TS_READ_UCODE_START);
- ucode_list = cbfs_map("cpu_microcode_blob.bin", &ucode_len);
+ ucode_list = cbfs_map(CPU_MICROCODE_BLOB_NAME, &ucode_len);
if (!ucode_list) {
- printk(BIOS_WARNING, "cpu_microcode_blob.bin not found. Skipping updates.\n");
+ printk(BIOS_WARNING,
+ CPU_MICROCODE_BLOB_NAME " not found. Skipping updates.\n");
return;
}
@@ -120,3 +123,12 @@
apply_microcode_patch(&ucode_cache);
}
+
+void preload_microcode(void)
+{
+ if (!CONFIG(CBFS_PRELOAD))
+ return;
+
+ printk(BIOS_DEBUG, "Preloading microcode %s\n", CPU_MICROCODE_BLOB_NAME);
+ cbfs_preload(CPU_MICROCODE_BLOB_NAME);
+}