linux-kernel - Re: [PATCH V2 2/2] efi/fb: Convert PCI bus address to resource if translated by the bridge

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Date:   Wed, 13 Jun 2018 11:29:44 -0400
From:   okaya@...eaurora.org
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        "open list:EFIFB FRAMEBUFFER DRIVER" <linux-fbdev@...r.kernel.org>,
        Timur Tabi <timur@...eaurora.org>,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Peter Jones <pjones@...hat.com>,
        "open list:FRAMEBUFFER LAYER" <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 2/2] efi/fb: Convert PCI bus address to resource if
 translated by the bridge

On 2018-06-13 11:22, Ard Biesheuvel wrote:
> On 13 June 2018 at 17:17,  <okaya@...eaurora.org> wrote:
>> On 2018-06-13 11:06, Ard Biesheuvel wrote:
>>> 
>>> On 13 June 2018 at 16:22, Sinan Kaya <okaya@...eaurora.org> wrote:
>>>> 
>>>> Hi Ard,
>>>> 
>>>> On 5/18/2018 10:17 AM, Sinan Kaya wrote:
>>>>> 
>>>>> A host bridge is allowed to remap BAR addresses using _TRA 
>>>>> attribute in
>>>>> _CRS windows.
>>>>> 
>>>>> pci_bus 0000:00: root bus resource [mem 0x80100100000-0x8011fffffff
>>>>> window] (bus address [0x00100000-0x1fffffff])
>>>>> pci 0000:02:00.0: reg 0x10: [mem 0x8011e000000-0x8011effffff]
>>>>> 
>>>>> When a VGA device is behind such a host bridge and the resource is
>>>>> translated efifb driver is trying to do ioremap against bus address
>>>>> rather than the resource address and is failing to probe.
>>>>> 
>>>>> efifb: probing for efifb
>>>>> efifb: cannot reserve video memory at 0x1e000000
>>>>> efifb: framebuffer at 0x1e000000, using 1920k, total 1875k
>>>>> efifb: mode is 800x600x32, linelength=3200, pages=1
>>>>> efifb: scrolling: redraw
>>>>> efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
>>>>> 
>>>>> Use the host bridge offset information to convert bus address to
>>>>> resource address in the fixup.
>>>>> 
>>>>> Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
>>>>> ---
>>>> 
>>>> 
>>>> I didn't see any messages about these getting picked up for 4.18.
>>>> 
>>>> Are they queued on your own branch?
>>>> 
>>> 
>>> No, you never cc'ed me on them until now.
>> 
>> 
>> Ouch, I hoped that you would get it via get_maintainer script. Sorry 
>> for
>> that.
> 
> Actually, get_maintainer is right: this should go through the fbdev
> tree not the EFI tree
> 
> Were you going to resend them? If not, I can find them in my archive
> and ack them, and we will ask Bartlomiej to take them for v4.19

I prefer ack rather than resend to be honest.