diff options
| author | Yidi Lin <yidilin@chromium.org> | 2024-01-16 15:08:41 +0800 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2024-01-17 14:41:00 +0000 |
| commit | c68176c14e5ded7e8b63f4deeaf9ea714e4b9969 (patch) | |
| tree | 9d788363c37f6ffc10a42ea2b9d11c80767b9d15 /src/soc/mediatek/common | |
| parent | 3dadbb9c209d90c66edcef75bd5bc7352fed8da7 (diff) | |
soc/mediatek: Add EARLY_MMU_INIT kconfig option
Accessing RAM before mmu initialized is time consuming. During mmu
initialization, `mmu_init()` and `mmu_config_range()` write logs to the
console buffer and contribue the extra boot time.
This patch adds a kconfig option to move `mtk_mmu_init()` to
`bootblock_soc_early_init()`. When `EARLY_MMU_INIT` is enabled, mmu is
initialized before `console_init()` ready. So `mmu_init()` and
`mmu_config_range()` won't write logs to the console buffer and save the
boot time.
It saves about 65ms on Geralt with EARLY_MMU_INIT enabled.
Before:
0:1st timestamp 239,841 (0)
11:start of bootblock 239,920 (79)
12:end of bootblock 323,191 (83,271)
After:
0:1st timestamp 239,804 (0)
11:start of bootblock 239,884 (80)
12:end of bootblock 258,846 (18,962)
BUG=b:320381143
TEST=check timestamps in cbmem
Change-Id: I7f4c3c6c836f7276119698c6de362794cf4222a6
Signed-off-by: Yidi Lin <yidilin@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79990
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Diffstat (limited to 'src/soc/mediatek/common')
| -rw-r--r-- | src/soc/mediatek/common/Kconfig | 7 | ||||
| -rw-r--r-- | src/soc/mediatek/common/bootblock.c | 10 | ||||
| -rw-r--r-- | src/soc/mediatek/common/mmu_operations.c | 7 |
3 files changed, 24 insertions, 0 deletions
diff --git a/src/soc/mediatek/common/Kconfig b/src/soc/mediatek/common/Kconfig index 8092aa7699..268f2f30f5 100644 --- a/src/soc/mediatek/common/Kconfig +++ b/src/soc/mediatek/common/Kconfig @@ -91,4 +91,11 @@ config DEVAPC_DEBUG When this option is enabled, the DEVAPC driver prints the settings after initialization. +config EARLY_MMU_INIT + bool + default n + help + When this option is enabled, `mtk_mmu_init()` will be done in + `bootblock_soc_early_init()` to reduce the boot time. + endif diff --git a/src/soc/mediatek/common/bootblock.c b/src/soc/mediatek/common/bootblock.c new file mode 100644 index 0000000000..6474a8f53c --- /dev/null +++ b/src/soc/mediatek/common/bootblock.c @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include <bootblock_common.h> +#include <soc/mmu_operations.h> + +void bootblock_soc_early_init(void) +{ + if (CONFIG(EARLY_MMU_INIT)) + mtk_mmu_init(); +} diff --git a/src/soc/mediatek/common/mmu_operations.c b/src/soc/mediatek/common/mmu_operations.c index 340f9ec989..cbd6c094dd 100644 --- a/src/soc/mediatek/common/mmu_operations.c +++ b/src/soc/mediatek/common/mmu_operations.c @@ -9,6 +9,13 @@ __weak void mtk_soc_after_dram(void) { /* do nothing */ } void mtk_mmu_init(void) { + static bool mmu_inited; + + if (mmu_inited) + return; + + mmu_inited = true; + mmu_init(); /* |