svn commit: r291225 - in head: sys/dev/pci usr.sbin/pciconf

[John Baldwin]

On Monday, November 23, 2015 11:48:07 PM John Baldwin wrote:
> Author: jhb
> Date: Mon Nov 23 23:48:07 2015
> New Revision: 291225
> URL: https://svnweb.freebsd.org/changeset/base/291225
> 
> Log:
>   Add a new -B flag for use with list mode (-l) that lists details about
>   bridges.  Currently this includes information about what resources a
>   bridge decodes on the upstream side for use by downstream devices including
>   bus numbers, I/O port resources, and memory resources.  Windows and bus
>   ranges are enumerated for both PCI-PCI bridges and PCI-CardBus bridges.
>   
>   To simplify the implementation, all enumeration is done by reading the
>   appropriate config space registers directly rather than querying the
>   bridge driver in the kernel via new ioctls.  This does result in a few
>   limitations.
>   
>   First, an unimplemented window in a PCI-PCI bridge cannot be accurately
>   detected as accurate detection requires writing to the window base
>   register.  That is not safe for pciconf(8).  Instead, this assumes that
>   any window where both the base and limit read as all zeroes is
>   unimplemented.
>   
>   Second, the PCI-PCI bridge driver in a tree has a few quirks for
>   PCI-PCI bridges that use subtractive decoding but do not indicate that
>   via the progif config register.  The list of quirks is duplicated in
>   pciconf's source.

Some sample output:

pcib6 at pci0:0:30:0:      class=0x060401 card=0x20f417aa chip=0x24488086 rev=0x93 hdr=0x01
    bus range  = 21-24
    window[1c] = type I/O Port, range 16, addr 0x5000-0x8fff, enabled
    window[20] = type Memory, range 32, addr 0xf4300000-0xf7ffffff, enabled
    window[24] = type Prefetchable Memory, range 64, addr 0xf0000000-0xf3ffffff, enabled
    decode     = ISA, subtractive
...
cbb0 at pci0:21:0:0:       class=0x060700 card=0x20c617aa chip=0x04761180 rev=0xba hdr=0x02
    bus range  = 22-24
    window[1c] = type Memory, range 32, addr 0xfff00000-0xfffff, disabled
    window[24] = type Memory, range 32, addr 0xfff00000-0xfffff, disabled
    window[2c] = type I/O Port, range 16, addr 0x5000-0x50fc, enabled
    window[34] = type I/O Port, range 16, addr 0xfffc-0, disabled

-- 
John Baldwin