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soc/intel/common/fast_spi: support caching `ext_bios` in ramstage 

This patch provides a way to cache `ext_bios` region for all stages to
save boot time.

TEST=Able to see the ext_bios region in MTRR snapshot when cached on
the Brya variants.

Here is the timestamp snippet showing the payload load time as a
comparison between current upstream and the patched version:

upstream:
  90:starting to load payload                    1,072,459 (1,802)
 958:calling FspNotify(ReadyToBoot)              12,818,079 (11,745,619)

with this patch:
  90:starting to load payload                    1,072,663 (2,627)
 958:calling FspNotify(ReadyToBoot)              5,299,535 (4,226,871)

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I87139a9ed7eb9ed43164a5199aa436dd1219145c
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62837
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Subrata Banik 2022-03-15 16:51:29 +05:30
parent 242e2665d0
commit 1f28c853de
1 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
src/soc/intel/common/block/fast_spi/fast_spi.c
View File

@ -245,10 +245,14 @@ static void fast_spi_cache_ext_bios_window(void)
if (!fast_spi_ext_bios_cache_range(&ext_bios_base, &ext_bios_size))
return;
if (ENV_PAYLOAD_LOADER) {
mtrr_use_temp_range(ext_bios_base, ext_bios_size, type);
} else {
int mtrr = get_free_var_mtrr();
if (mtrr == -1)
return;
set_var_mtrr(mtrr, ext_bios_base, ext_bios_size, type);
}
}
void fast_spi_cache_ext_bios_postcar(struct postcar_frame *pcf)