lkml.org 
[lkml]   [2009]   [Apr]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [RFC PATCH 1/2] pci: don't assume pref memio are 64bit -v3
    From
    On Wed, Apr 22, 2009 at 6:05 PM, Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
    > On Wed, 22 Apr 2009 17:49:18 -0700
    > Yinghai Lu <yinghai@kernel.org> wrote:
    >
    >> Jesse Barnes wrote:
    >> > On Wed, 22 Apr 2009 15:37:04 -0700
    >> > Yinghai Lu <yinghai@kernel.org> wrote:
    >> >
    >> >> one system with 4g installed ( there is 1g hole)
    >> >>
    >> >> when 4G installed.
    >> >> BIOS put ACPI etc need the hole
    >> >> [    0.000000] BIOS-provided physical RAM map:
    >> >> [    0.000000]  BIOS-e820: 0000000000000000 - 000000000009bc00
    >> >> (usable) [    0.000000]  BIOS-e820: 000000000009bc00 -
    >> >> 00000000000a0000 (reserved) [    0.000000]  BIOS-e820:
    >> >> 00000000000e3000 - 0000000000100000 (reserved) [    0.000000]
    >> >> BIOS-e820: 0000000000100000 - 00000000bffa0000 (usable)
    >> >> [    0.000000]  BIOS-e820: 00000000bffa0000 - 00000000bffae000
    >> >> (ACPI data) [    0.000000]  BIOS-e820: 00000000bffae000 -
    >> >> 00000000bfff0000 (ACPI NVS) [    0.000000]  BIOS-e820:
    >> >> 00000000bfff0000 - 00000000c0000000 (reserved) [    0.000000]
    >> >> BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
    >> >> [    0.000000] BIOS-e820: 00000000ffb00000 - 0000000100000000
    >> >> (reserved) [    0.000000]  BIOS-e820: 0000000100000000 -
    >> >> 0000000140000000 (usable) so in kernel resource will be reserved
    >> >> for 0xbffa0000 - 0xbfff0000 for ACPI 0x100000 -  0xbffa0000 for
    >> >> RAM...
    >> >>
    >> >> and BIOS set
    >> >> [    0.240007] pci 0000:00:01.0: bridge 64bit mmio pref:
    >> >> [0xbdf00000-0xddefffff] [    0.237102] pci 0000:01:00.0: reg 10
    >> >> 32bit mmio: [0xc0000000-0xcfffffff] that is conflict with reserved
    >> >> res. so it can not be reserved Kernel.
    >> >>
    >> >> then Kernel try to get range from 0x140000000 ( above the RAM, 5G
    >> >> and above 4g) and set let the bridge to use it, and ATI cards to
    >> >> use it.
    >> >>
    >> >> but the problem is that ATI only support 32bit ...
    >> >
    >> > So Ivan's patch didn't work for you for this problem?  I was
    >> > planning on applying it, but it would be nice to get some test
    >> > results first.
    >>
    >> looks like Ivan patch still has some problem.
    >
    > Can you be more specific? :)  I'd like to get this resolved properly as
    > well, and I think the principles Ivan outlined are the right ones to
    > follow...
    >

    to check the BAR support 64bit or not should be read from
    pci_read_bases and pci_bridge_read_bases...

    aka Ivan's patch logic is some kind of wrong.

    YH
    --
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2009-04-23 04:07    [W:0.035 / U:90.908 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site