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firmware: Add support for loading compressed files

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This patch adds the support for loading compressed firmware files.
The primary motivation is to reduce the storage size; e.g. currently
the files in /lib/firmware on my machine counts up to 419MB, while
they can be reduced to 130MB by file compression.

The patch introduces a new kconfig option CONFIG_FW_LOADER_COMPRESS.
Even with this option set, the firmware loader still tries to load the
original firmware file as-is at first, but then falls back to the file
with ".xz" extension when it's not found, and the decompressed file
content is returned to the caller of request_firmware().  So, no
change is needed for the rest.

Currently only XZ format is supported.  A caveat is that the kernel XZ
helper code supports only CRC32 (or none) integrity check type, so
you'll have to compress the files via xz -C crc32 option.

Since we can't determine the expanded size immediately from an XZ
file, the patch re-uses the paged buffer that was used for the
user-mode fallback; it puts the decompressed content page, which are
vmapped at the end.  The paged buffer code is conditionally built with
a new Kconfig that is selected automatically.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai
2019-06-11 14:26:25 +02:00
committed by Greg Kroah-Hartman
parent 5342e7093f
commit 82fd7a8142
3 changed files with 161 additions and 12 deletions
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8
drivers/base/firmware_loader/firmware.h
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@@ -64,12 +64,14 @@ struct fw_priv {
void *data;
size_t size;
size_t allocated_size;
#ifdef CONFIG_FW_LOADER_USER_HELPER
#ifdef CONFIG_FW_LOADER_PAGED_BUF
bool is_paged_buf;
bool need_uevent;
struct page **pages;
int nr_pages;
int page_array_size;
#endif
#ifdef CONFIG_FW_LOADER_USER_HELPER
bool need_uevent;
struct list_head pending_list;
#endif
const char *fw_name;
@@ -133,7 +135,7 @@ static inline void fw_state_done(struct fw_priv *fw_priv)
int assign_fw(struct firmware *fw, struct device *device,
enum fw_opt opt_flags);
#ifdef CONFIG_FW_LOADER_USER_HELPER
#ifdef CONFIG_FW_LOADER_PAGED_BUF
void fw_free_paged_buf(struct fw_priv *fw_priv);
int fw_grow_paged_buf(struct fw_priv *fw_priv, int pages_needed);
int fw_map_paged_buf(struct fw_priv *fw_priv);