cbfs: Pull handling of the CBFS_CACHE mem_pool into CBFS core

This patch pulls control of the memory pool serving allocations from the
CBFS_CACHE memlayout area into cbfs.c and makes it a core part of the
CBFS API. Previously, platforms would independently instantiate this as
part of boot_device_ro() (mostly through cbfs_spi.c). The new cbfs_cache
pool is exported as a global so these platforms can still use it to
directly back rdev_mmap() on their boot device, but the cbfs_cache can
now also use it to directly make allocations itself. This is used to
allow transparent decompression support in cbfs_map().

Signed-off-by: Julius Werner <jwerner@chromium.org>
Change-Id: I0d52b6a8f582a81a19fd0fd663bb89eab55a49d9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49333
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/commonlib/Makefile.inc

@@ -5,6 +5,7 @@ verstage-y += mem_pool.c
 romstage-y += mem_pool.c
 ramstage-y += mem_pool.c
 postcar-y += mem_pool.c
+smm-y += mem_pool.c
 
 bootblock-y += iobuf.c
 verstage-y += iobuf.c

src/commonlib/include/commonlib/region.h

@@ -196,18 +196,16 @@ extern const struct region_device_ops mem_rdev_rw_ops;
 		MEM_REGION_DEV_INIT(base_, size_, &mem_rdev_rw_ops)	\
 
 struct mmap_helper_region_device {
-	struct mem_pool pool;
+	struct mem_pool *pool;
 	struct region_device rdev;
 };
 
-#define MMAP_HELPER_REGION_INIT(ops_, offset_, size_)			\
+#define MMAP_HELPER_DEV_INIT(ops_, offset_, size_, mpool_)		\
 	{								\
 		.rdev = REGION_DEV_INIT((ops_), (offset_), (size_)),	\
+		.pool = (mpool_),					\
 	}
 
-void mmap_helper_device_init(struct mmap_helper_region_device *mdev,
-				void *cache, size_t cache_size);
-
 void *mmap_helper_rdev_mmap(const struct region_device *, size_t, size_t);
 int mmap_helper_rdev_munmap(const struct region_device *, void *);
 

src/commonlib/region.c

@@ -287,12 +287,6 @@ const struct region_device_ops mem_rdev_rw_ops = {
 	.eraseat = mdev_eraseat,
 };
 
-void mmap_helper_device_init(struct mmap_helper_region_device *mdev,
-				void *cache, size_t cache_size)
-{
-	mem_pool_init(&mdev->pool, cache, cache_size);
-}
-
 void *mmap_helper_rdev_mmap(const struct region_device *rd, size_t offset,
 				size_t size)
 {
@@ -301,13 +295,13 @@ void *mmap_helper_rdev_mmap(const struct region_device *rd, size_t offset,
 
 	mdev = container_of((void *)rd, __typeof__(*mdev), rdev);
 
-	mapping = mem_pool_alloc(&mdev->pool, size);
+	mapping = mem_pool_alloc(mdev->pool, size);
 
 	if (mapping == NULL)
 		return NULL;
 
 	if (rd->ops->readat(rd, mapping, offset, size) != size) {
-		mem_pool_free(&mdev->pool, mapping);
+		mem_pool_free(mdev->pool, mapping);
 		return NULL;
 	}
 
@@ -320,7 +314,7 @@ int mmap_helper_rdev_munmap(const struct region_device *rd, void *mapping)
 
 	mdev = container_of((void *)rd, __typeof__(*mdev), rdev);
 
-	mem_pool_free(&mdev->pool, mapping);
+	mem_pool_free(mdev->pool, mapping);
 
 	return 0;
 }