cbfs: Add metadata cache

This patch adds a new CBFS "mcache" (metadata cache) -- a memory buffer
that stores the headers of all CBFS files. Similar to the existing FMAP
cache, this cache should reduce the amount of SPI accesses we need to do
every boot: rather than having to re-read all CBFS headers from SPI
flash every time we're looking for a file, we can just walk the same
list in this in-memory copy and finally use it to directly access the
flash at the right position for the file data.

This patch adds the code to support the cache but doesn't enable it on
any platform. The next one will turn it on by default.

Change-Id: I5b1084bfdad1c6ab0ee1b143ed8dd796827f4c65
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38423
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/security/vboot/vboot_common.h b/src/security/vboot/vboot_common.h
index e64f6632a7..512da0e91f 100644
--- a/src/security/vboot/vboot_common.h
+++ b/src/security/vboot/vboot_common.h
@@ -3,6 +3,7 @@
 #define __VBOOT_VBOOT_COMMON_H__
 
 #include <commonlib/region.h>
+#include <cbfs.h>
 #include <vb2_api.h>
 
 /*
@@ -50,14 +51,17 @@ int vboot_developer_mode_enabled(void);
 int vboot_recovery_mode_enabled(void);
 int vboot_can_enable_udc(void);
 void vboot_run_logic(void);
-int vboot_locate_cbfs(struct region_device *rdev);
+const struct cbfs_boot_device *vboot_get_cbfs_boot_device(void);
 #else /* !CONFIG_VBOOT */
 static inline int vboot_developer_mode_enabled(void) { return 0; }
 static inline int vboot_recovery_mode_enabled(void) { return 0; }
 /* If VBOOT is not enabled, we are okay enabling USB device controller (UDC). */
 static inline int vboot_can_enable_udc(void) { return 1; }
 static inline void vboot_run_logic(void) {}
-static inline int vboot_locate_cbfs(struct region_device *rdev) { return -1; }
+static inline const struct cbfs_boot_device *vboot_get_cbfs_boot_device(void)
+{
+	return NULL;
+}
 #endif
 
 void vboot_save_data(struct vb2_context *ctx);