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Date: Fri, 22 Oct 2021 14:19:00 +0200
From: Greg KH <gregkh@...uxfoundation.org>
To: "Luis R. Rodriguez" <mcgrof@...nel.org>
Cc: bp@...e.de, akpm@...ux-foundation.org, josh@...htriplett.org,
rishabhb@...eaurora.org, kubakici@...pl, maco@...roid.com,
david.brown@...aro.org, bjorn.andersson@...aro.org,
linux-wireless@...r.kernel.org, keescook@...omium.org,
shuah@...nel.org, mfuzzey@...keon.com, zohar@...ux.vnet.ibm.com,
dhowells@...hat.com, pali.rohar@...il.com, tiwai@...e.de,
arend.vanspriel@...adcom.com, zajec5@...il.com, nbroeking@...com,
broonie@...nel.org, dmitry.torokhov@...il.com, dwmw2@...radead.org,
torvalds@...ux-foundation.org, Abhay_Salunke@...l.com,
jewalt@...innovations.com, cantabile.desu@...il.com, ast@...com,
andresx7@...il.com, dan.rue@...aro.org, brendanhiggins@...gle.com,
yzaikin@...gle.com, sfr@...b.auug.org.au, rdunlap@...radead.org,
linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2 07/10] firmware_loader: rename EXTRA_FIRMWARE and
EXTRA_FIRMWARE_DIR
On Thu, Oct 21, 2021 at 08:58:40AM -0700, Luis R. Rodriguez wrote:
> From: Luis Chamberlain <mcgrof@...nel.org>
>
> Now that we've tied loose ends on the built-in firmware API,
> rename the kconfig symbols for it to reflect more that they are
> associated to the firmware_loader and to make it easier to
> understand what they are for.
>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
> .../driver-api/firmware/built-in-fw.rst | 6 ++--
> Documentation/x86/microcode.rst | 8 ++---
> arch/x86/Kconfig | 4 +--
> drivers/base/firmware_loader/Kconfig | 29 ++++++++++++-------
> drivers/base/firmware_loader/builtin/Makefile | 6 ++--
> drivers/staging/media/av7110/Kconfig | 4 +--
> 6 files changed, 33 insertions(+), 24 deletions(-)
>
> diff --git a/Documentation/driver-api/firmware/built-in-fw.rst b/Documentation/driver-api/firmware/built-in-fw.rst
> index bc1c961bace1..a9a0ab8c9512 100644
> --- a/Documentation/driver-api/firmware/built-in-fw.rst
> +++ b/Documentation/driver-api/firmware/built-in-fw.rst
> @@ -8,11 +8,11 @@ the filesystem. Instead, firmware can be looked for inside the kernel
> directly. You can enable built-in firmware using the kernel configuration
> options:
>
> - * CONFIG_EXTRA_FIRMWARE
> - * CONFIG_EXTRA_FIRMWARE_DIR
> + * CONFIG_FW_LOADER_BUILTIN_FILES
> + * CONFIG_FW_LOADER_BUILTIN_DIR
>
> There are a few reasons why you might want to consider building your firmware
> -into the kernel with CONFIG_EXTRA_FIRMWARE:
> +into the kernel with CONFIG_FW_LOADER_BUILTIN_FILES:
>
> * Speed
> * Firmware is needed for accessing the boot device, and the user doesn't
> diff --git a/Documentation/x86/microcode.rst b/Documentation/x86/microcode.rst
> index a320d37982ed..2cacc7f60014 100644
> --- a/Documentation/x86/microcode.rst
> +++ b/Documentation/x86/microcode.rst
> @@ -114,13 +114,13 @@ Builtin microcode
> =================
>
> The loader supports also loading of a builtin microcode supplied through
> -the regular builtin firmware method CONFIG_EXTRA_FIRMWARE. Only 64-bit is
> -currently supported.
> +the regular builtin firmware method using CONFIG_FW_LOADER_BUILTIN and
> +CONFIG_FW_LOADER_BUILTIN_FILES. Only 64-bit is currently supported.
>
> Here's an example::
>
> - CONFIG_EXTRA_FIRMWARE="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"
> - CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
> + CONFIG_FW_LOADER_BUILTIN_FILES="intel-ucode/06-3a-09 amd-ucode/microcode_amd_fam15h.bin"
> + CONFIG_FW_LOADER_BUILTIN_DIR="/lib/firmware"
>
> This basically means, you have the following tree structure locally::
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 999907dd7544..cfb09dc7f21b 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1315,8 +1315,8 @@ config MICROCODE
> initrd for microcode blobs.
>
> In addition, you can build the microcode into the kernel. For that you
> - need to add the vendor-supplied microcode to the CONFIG_EXTRA_FIRMWARE
> - config option.
> + need to add the vendor-supplied microcode to the configuration option
> + CONFIG_FW_LOADER_BUILTIN_FILES
>
> config MICROCODE_INTEL
> bool "Intel microcode loading support"
> diff --git a/drivers/base/firmware_loader/Kconfig b/drivers/base/firmware_loader/Kconfig
> index 5b24f3959255..2dc3e137d903 100644
> --- a/drivers/base/firmware_loader/Kconfig
> +++ b/drivers/base/firmware_loader/Kconfig
> @@ -22,14 +22,14 @@ config FW_LOADER
> You typically want this built-in (=y) but you can also enable this
> as a module, in which case the firmware_class module will be built.
> You also want to be sure to enable this built-in if you are going to
> - enable built-in firmware (CONFIG_EXTRA_FIRMWARE).
> + enable built-in firmware (CONFIG_FW_LOADER_BUILTIN_FILES).
>
> if FW_LOADER
>
> config FW_LOADER_PAGED_BUF
> bool
>
> -config EXTRA_FIRMWARE
> +config FW_LOADER_BUILTIN_FILES
> string "Build named firmware blobs into the kernel binary"
> help
> Device drivers which require firmware can typically deal with
> @@ -43,14 +43,21 @@ config EXTRA_FIRMWARE
> in boot and cannot rely on the firmware being placed in an initrd or
> initramfs.
>
> - This option is a string and takes the (space-separated) names of the
> + Support for built-in firmware is not supported if you are using
> + the firmware loader as a module.
> +
> + This option is a string and takes the space-separated names of the
> firmware files -- the same names that appear in MODULE_FIRMWARE()
> and request_firmware() in the source. These files should exist under
> - the directory specified by the EXTRA_FIRMWARE_DIR option, which is
> + the directory specified by the FW_LOADER_BUILTIN_DIR option, which is
> /lib/firmware by default.
>
> - For example, you might set CONFIG_EXTRA_FIRMWARE="usb8388.bin", copy
> - the usb8388.bin file into /lib/firmware, and build the kernel. Then
> + For example, you might have set:
> +
> + CONFIG_FW_LOADER_BUILTIN_FILES="usb8388.bin"
> +
> + After this you would copy the usb8388.bin file into directory
> + specified by FW_LOADER_BUILTIN_DIR and build the kernel. Then
> any request_firmware("usb8388.bin") will be satisfied internally
> inside the kernel without ever looking at your filesystem at runtime.
>
> @@ -60,13 +67,15 @@ 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.
>
> -config EXTRA_FIRMWARE_DIR
> - string "Firmware blobs root directory"
> +config FW_LOADER_BUILTIN_DIR
> + string "Directory with firmware to be built-in to the kernel"
> depends on EXTRA_FIRMWARE != ""
You forgot to update this dependency :(
I took the first 6 patches here, this one needs work.
thanks,
greg k-h
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