linux-kernel - Re: [PATCH v2 2/2] firmware_loader: Enable compressed files with EXTRA

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Date: Sun, 7 Jan 2024 18:12:46 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Kevin Martin <kevinmbecause@...il.com>
Cc: Luis Chamberlain <mcgrof@...nel.org>, Russ Weight <russ.weight@...ux.dev>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, "Rafael J. Wysocki" <rafael@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] firmware_loader: Enable compressed files with EXTRA_FIRMWARE

On Fri, Jan 5, 2024 at 3:11 PM Kevin Martin <kevinmbecause@...il.com> wrote:
>
> The linux-firmware packages on Gentoo, Fedora, Arch, and others
> compress the firmware files. This works well with
> CONFIG_FW_LOADER_COMPRESS but does not work with CONFIG_EXTRA_FIRMWARE.
> This patch allows the build system to decompress firmware files
> specified by CONFIG_EXTRA_FIRMWARE. Uncompressed files are used first,
> then the compressed files are used.
>
> The patch works by copying or decompressing the specified firmware files
> into the build directory, then compiling them in from there. I would
> prefer to not copy any uncompressed files, but I have not found a clean
> way to do that.
>
> Signed-off-by: Kevin Martin <kevinmbecause@...il.com>
> ---
> Changes in v2:
> - Changed .gitignore to ignore all firmware files copied into the
> directory.
> - Fixed a tab.
>
>  drivers/base/firmware_loader/Kconfig            |  5 ++++-
>  drivers/base/firmware_loader/builtin/.gitignore |  5 ++++-
>  drivers/base/firmware_loader/builtin/Makefile   | 16 ++++++++++++----
>  3 files changed, 20 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/base/firmware_loader/Kconfig b/drivers/base/firmware_loader/Kconfig
> index 5ca00e02f..b7a908bff 100644
> --- a/drivers/base/firmware_loader/Kconfig
> +++ b/drivers/base/firmware_loader/Kconfig
> @@ -76,7 +76,10 @@ config EXTRA_FIRMWARE
>           image since it combines both GPL and non-GPL work. You should
>           consult a lawyer of your own before distributing such an image.
>
> -         NOTE: Compressed files are not supported in EXTRA_FIRMWARE.
> +         NOTE: Compressed files are supported by EXTRA_FIRMWARE. The build
> +         system will look for uncompressed files first then fall back to
> +         searching for compressed files in a similar way to
> +         CONFIG_FW_LOADER_COMPRESS.
>
>  config EXTRA_FIRMWARE_DIR
>         string "Firmware blobs root directory"
> diff --git a/drivers/base/firmware_loader/builtin/.gitignore b/drivers/base/firmware_loader/builtin/.gitignore
> index 166f76b43..b3124ee78 100644
> --- a/drivers/base/firmware_loader/builtin/.gitignore
> +++ b/drivers/base/firmware_loader/builtin/.gitignore
> @@ -1,2 +1,5 @@
>  # SPDX-License-Identifier: GPL-2.0
> -*.gen.S
> +*
> +!.gitignore
> +!Makefile
> +!main.c
> diff --git a/drivers/base/firmware_loader/builtin/Makefile b/drivers/base/firmware_loader/builtin/Makefile
> index 6c067dedc..cc60eb441 100644
> --- a/drivers/base/firmware_loader/builtin/Makefile
> +++ b/drivers/base/firmware_loader/builtin/Makefile
> @@ -20,7 +20,7 @@ filechk_fwbin = \
>         echo "    .section .rodata"                             ;\
>         echo "    .p2align 4"                                   ;\
>         echo "_fw_$(FWSTR)_bin:"                                ;\
> -       echo "    .incbin \"$(fwdir)/$(FWNAME)\""               ;\
> +       echo "    .incbin \"$(obj)/$(FWNAME)\""                 ;\
>         echo "_fw_end:"                                         ;\
>         echo "    .section .rodata.str,\"aMS\",$(PROGBITS),1"   ;\
>         echo "    .p2align $(ASM_ALIGN)"                        ;\
> @@ -36,7 +36,15 @@ $(obj)/%.gen.S: FORCE
>         $(call filechk,fwbin)
>
>  # The .o files depend on the binaries directly; the .S files don't.
> -$(addprefix $(obj)/, $(firmware)): $(obj)/%.gen.o: $(fwdir)/%
> +$(addprefix $(obj)/, $(firmware)): $(obj)/%.gen.o: $(obj)/%
>
> -targets := $(patsubst $(obj)/%,%, \
> -                                $(shell find $(obj) -name \*.gen.S 2>/dev/null))
> +$(obj)/% : $(fwdir)/% FORCE
> +       $(call if_changed,copy)
> +
> +$(obj)/% : $(fwdir)/%.xz FORCE
> +       $(call if_changed,xzdec)
> +
> +$(obj)/% : $(fwdir)/%.zst FORCE
> +       $(call if_changed,zstddec)
> +
> +targets := $(patsubst %.gen.o, %.gen.S, $(firmware)) $(CONFIG_EXTRA_FIRMWARE)


I noticed that "make clean" leaves copied firmware files
in drivers/base/firmware_loader/builtin/.


You need to clean up all files in
drivers/base/firmware_loader/builtin/
except Makefile, main.c.

The following worked for me.


diff --git a/drivers/base/firmware_loader/builtin/Makefile
b/drivers/base/firmware_loader/builtin/Makefile
index bcac1723dc32..4d62ee9f06f6 100644
--- a/drivers/base/firmware_loader/builtin/Makefile
+++ b/drivers/base/firmware_loader/builtin/Makefile
@@ -48,3 +48,5 @@ $(obj)/% : $(fwdir)/%.zst FORCE
        $(call if_changed,zstddec)

 targets := $(patsubst %.gen.o, %.gen.S, $(firmware)) $(CONFIG_EXTRA_FIRMWARE)
+
+clean-files := $(filter-out Makefile main.c, $(patsubst $(obj)/%,%,
$(wildcard $(obj)/*)))













-- 
Best Regards
Masahiro Yamada