netdev - Re: [PATCH] brcmfmac: expose firmware config files through modinfo

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Date:   Wed, 1 Jul 2020 17:46:58 +0200
From:   Matthias Brugger <mbrugger@...e.com>
To:     Hans de Goede <hdegoede@...hat.com>, matthias.bgg@...nel.org,
        Jakub Kicinski <kuba@...nel.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Pali Rohár <pali@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Chung-Hsien Hsu <stanley.hsu@...ress.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Double Lo <double.lo@...ress.com>,
        Frank Kao <frank.kao@...ress.com>,
        linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        Arend van Spriel <arend.vanspriel@...adcom.com>,
        "Gustavo A . R . Silva" <gustavo@...eddedor.com>,
        netdev@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Wright Feng <wright.feng@...ress.com>,
        Saravanan Shanmugham <saravanan.shanmugham@...ress.com>,
        brcm80211-dev-list@...ress.com, linux-kernel@...r.kernel.org,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Soeren Moch <smoch@....de>
Subject: Re: [PATCH] brcmfmac: expose firmware config files through modinfo

Hi Hans,

On 01/07/2020 17:38, Hans de Goede wrote:
> Hi,
> 
> On 7/1/20 5:31 PM, matthias.bgg@...nel.org wrote:
>> From: Matthias Brugger <mbrugger@...e.com>
>>
>> Apart from a firmware binary the chip needs a config file used by the
>> FW. Add the config files to modinfo so that they can be read by
>> userspace.
> 
> The configfile firmware filename is dynamically generated, just adding the list
> of all currently shipped ones is not really helpful and this is going to get
> out of sync with what we actually have in linux-firmware.

I'm aware of this, and I agree.

> 
> I must honestly say that I'm not a fan of this, I guess you are trying to
> get some tool which builds a minimal image, such as an initrd generator
> to add these files to the image ?
> 

Yes exactly.

> I do not immediately have a better idea, but IMHO the solution
> this patch proposes is not a good one, so nack from me for this change.
> 

Another path we could go is add a wildcard string instead, for example:
MODULE_FIRMWARE("brcm/brcmfmac43455-sdio.*.txt");

AFAIK there is no driver in the kernel that does this. I checked with our dracut
developer and right now dracut can't cope with that. But he will try to
implement that in the future.

So my idea was to maintain that list for now and switch to the wildcard approach
once we have dracut support that.

Regards,
Matthias

> Regards,
> 
> Hans
> 
> 
> 
>>
>> Signed-off-by: Matthias Brugger <mbrugger@...e.com>
>>
>> ---
>>
>>   .../wireless/broadcom/brcm80211/brcmfmac/sdio.c  | 16 ++++++++++++++++
>>   1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
>> b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
>> index 310d8075f5d7..ba18df6d8d94 100644
>> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
>> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
>> @@ -624,6 +624,22 @@ BRCMF_FW_DEF(4359, "brcmfmac4359-sdio");
>>   BRCMF_FW_DEF(4373, "brcmfmac4373-sdio");
>>   BRCMF_FW_DEF(43012, "brcmfmac43012-sdio");
>>   +/* firmware config files */
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac4330-sdio.Prowise-PT301.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac43340-sdio.meegopad-t08.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac43340-sdio.pov-tab-p1006w-data.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac43362-sdio.cubietech,cubietruck.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac43430a0-sdio.jumper-ezpad-mini3.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH "brcm/brcmfmac43430a0-sdio.ONDA-V80
>> PLUS.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH "brcm/brcmfmac43430-sdio.AP6212.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac43430-sdio.Hampoo-D2D3_Vi8A1.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH "brcm/brcmfmac43430-sdio.MUR1DX.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac43430-sdio.raspberrypi,3-model-b.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH "brcm/brcmfmac43455-sdio.MINIX-NEO
>> Z83-4.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac43455-sdio.raspberrypi,3-model-b-plus.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac43455-sdio.raspberrypi,4-model-b.txt");
>> +MODULE_FIRMWARE(BRCMF_FW_DEFAULT_PATH
>> "brcm/brcmfmac4356-pcie.gpd-win-pocket.txt");
>> +
>>   static const struct brcmf_firmware_mapping brcmf_sdio_fwnames[] = {
>>       BRCMF_FW_ENTRY(BRCM_CC_43143_CHIP_ID, 0xFFFFFFFF, 43143),
>>       BRCMF_FW_ENTRY(BRCM_CC_43241_CHIP_ID, 0x0000001F, 43241B0),
>>
>