src/lib: Add Kconfig option for SPD cache in FMAP
Currently, the option to cache DIMM SPD data in an FMAP region
is closely coupled to a single board (google/hatch) and requires
a custom FMAP to utilize.
Loosen this coupling by introducing a Kconfig option which adds
a correctly sized and aligned RW_SPD_CACHE region to the default FMAP.
Add a Kconfig option for the region name, replacing the existing hard-
coded instance in spd_cache.h. Change the inclusion of spd_cache.c to
use this new Kconfig, rather than the board-specific one currently used.
Lastly, have google/hatch select the new Kconfig when appropriate to
ensure no change in current functionality.
Test: build/boot WYVERN google/hatch variant with default FMAP, verify
FMAP contains RW_SPD_CACHE, verify SPD cache used via cbmem log.
Also tested on an out-of-tree Purism board.
Change-Id: Iee0e7acb01e238d7ed354e3dbab1207903e3a4fc
Signed-off-by: Matt DeVillier <matt.devillier@puri.sm>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48520
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Makefile.inc b/Makefile.inc
index 90280df..90c2494 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -966,6 +966,16 @@
FMAP_SMMSTORE_ENTRY :=
endif
+ifeq ($(CONFIG_SPD_CACHE_IN_FMAP),y)
+FMAP_SPD_CACHE_BASE := $(call int-align, $(FMAP_CURRENT_BASE), 0x4000)
+FMAP_SPD_CACHE_SIZE := $(call int-multiply, $(CONFIG_DIMM_MAX) $(CONFIG_DIMM_SPD_SIZE))
+FMAP_SPD_CACHE_SIZE := $(call int-align, $(FMAP_SPD_CACHE_SIZE), 0x1000)
+FMAP_SPD_CACHE_ENTRY := $(CONFIG_SPD_CACHE_FMAP_NAME)@$(FMAP_SPD_CACHE_BASE) $(FMAP_SPD_CACHE_SIZE)
+FMAP_CURRENT_BASE := $(call int-add, $(FMAP_SPD_CACHE_BASE) $(FMAP_SPD_CACHE_SIZE))
+else
+FMAP_SPD_CACHE_ENTRY :=
+endif
+
#
# X86 FMAP region
#
@@ -1042,6 +1052,7 @@
-e "s,##CONSOLE_ENTRY##,$(FMAP_CONSOLE_ENTRY)," \
-e "s,##MRC_CACHE_ENTRY##,$(FMAP_MRC_CACHE_ENTRY)," \
-e "s,##SMMSTORE_ENTRY##,$(FMAP_SMMSTORE_ENTRY)," \
+ -e "s,##SPD_CACHE_ENTRY##,$(FMAP_SPD_CACHE_ENTRY)," \
-e "s,##CBFS_BASE##,$(FMAP_CBFS_BASE)," \
-e "s,##CBFS_SIZE##,$(FMAP_CBFS_SIZE)," \
$(DEFAULT_FLASHMAP) > $@.tmp
diff --git a/src/include/spd_cache.h b/src/include/spd_cache.h
index 5465aad..a53b8eb 100644
--- a/src/include/spd_cache.h
+++ b/src/include/spd_cache.h
@@ -7,7 +7,7 @@
#include <stddef.h>
#include <stdint.h>
-#define SPD_CACHE_FMAP_NAME "RW_SPD_CACHE"
+#define SPD_CACHE_FMAP_NAME (CONFIG_SPD_CACHE_FMAP_NAME)
#define SC_SPD_NUMS (CONFIG_DIMM_MAX)
#define SC_SPD_OFFSET(n) (CONFIG_DIMM_SPD_SIZE * n)
#define SC_CRC_OFFSET (CONFIG_DIMM_MAX * CONFIG_DIMM_SPD_SIZE)
diff --git a/src/lib/Kconfig b/src/lib/Kconfig
index 168a068..e1d56fe 100644
--- a/src/lib/Kconfig
+++ b/src/lib/Kconfig
@@ -46,6 +46,23 @@
config SPD_READ_BY_WORD
bool
+config SPD_CACHE_IN_FMAP
+ bool
+ default n
+ help
+ Enables capability to cache DIMM SPDs in a dedicated FMAP region
+ to speed loading of SPD data. Currently requires board-level
+ romstage implementation to read/write/utilize cached SPD data.
+ When the default FMAP is used, will create a region named RW_SPD_CACHE
+ to store the cached SPD data.
+
+config SPD_CACHE_FMAP_NAME
+ string
+ depends on SPD_CACHE_IN_FMAP
+ default "RW_SPD_CACHE"
+ help
+ Name of the FMAP region created in the default FMAP to cache SPD data.
+
if RAMSTAGE_LIBHWBASE
config HWBASE_DYNAMIC_MMIO
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index 07555a7..8424cbf 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -372,4 +372,4 @@
ramstage-y += uuid.c
-romstage-$(CONFIG_ROMSTAGE_SPD_SMBUS) += spd_cache.c
+romstage-$(CONFIG_SPD_CACHE_IN_FMAP) += spd_cache.c
diff --git a/src/mainboard/google/hatch/Kconfig b/src/mainboard/google/hatch/Kconfig
index 20b7103..a4e91b6 100644
--- a/src/mainboard/google/hatch/Kconfig
+++ b/src/mainboard/google/hatch/Kconfig
@@ -86,6 +86,7 @@
config ROMSTAGE_SPD_SMBUS
bool
default n
+ select SPD_CACHE_IN_FMAP
config DRIVER_TPM_SPI_BUS
default 0x1
diff --git a/util/cbfstool/default-x86.fmd b/util/cbfstool/default-x86.fmd
index f0143e9..25c5096 100644
--- a/util/cbfstool/default-x86.fmd
+++ b/util/cbfstool/default-x86.fmd
@@ -12,6 +12,7 @@
##CONSOLE_ENTRY##
##MRC_CACHE_ENTRY##
##SMMSTORE_ENTRY##
+ ##SPD_CACHE_ENTRY##
FMAP@##FMAP_BASE## ##FMAP_SIZE##
COREBOOT(CBFS)@##CBFS_BASE## ##CBFS_SIZE##
}