Pack of CAM improvements

[Juergen Lock]

In article <4B62F2B0.2030704 at FreeBSD.org> you write:
>Andriy Gapon wrote:
>> on 29/01/2010 13:41 Alexander Motin said the following:
>>> Yamagi Burmeister wrote:
>>>> On Thu, 28 Jan 2010, Alexander Motin wrote:
>>>>
>>>>>>> Yamagi Burmeister wrote:
>>>>>>>> ahcich0: is 00000002 cs 00000000 ss 00000000 rs 00000001 tfd 50 serr
>>>>>>>> 00000000
>>>>>>>> ahcich0: Timeout on slot 0
>>>>>>> Try to disable MSI interrupts with `hint.ahci.0.msi=0`.
>>>>>> That fixed the problem. Thank you :)
>>>>> That's quite strange, as in many other cases IXP700 is working fine.
>>>>> Different revisions? What is your `pciconf -lvbc` reports?
>>>> When I helped nox@ debugging a problem with timeouts we noticed, that
>>>> our controlers are of differend revisions. The pciconf output ist:
>>>>
>>>> ahci0 at pci0:0:17:0:      class=0x010601 card=0x43911002 chip=0x43911002
>>>> rev=0x00 hdr=0x00
>>>>     vendor     = 'ATI Technologies Inc. / Advanced Micro Devices, Inc.'
>>>>     device     = 'SB700 SATA Controller [AHCI mode]'
>>>>     class      = mass storage
>>>>     subclass   = SATA
>>>>     bar   [10] = type I/O Port, range 32, base 0xd000, size  8, enabled
>>>>     bar   [14] = type I/O Port, range 32, base 0xc000, size  4, enabled
>>>>     bar   [18] = type I/O Port, range 32, base 0xb000, size  8, enabled
>>>>     bar   [1c] = type I/O Port, range 32, base 0xa000, size  4, enabled
>>>>     bar   [20] = type I/O Port, range 32, base 0x9000, size 16, enabled
>>>>     bar   [24] = type Memory, range 32, base 0xfe8ff800, size 1024,
>>>> enabled
>>>>     cap 01[60] = powerspec 2  supports D0 D3  current D0
>>>>     cap 05[50] = MSI supports 4 messages, 64 bit
>>>>     cap 12[70] = SATA Index-Data Pair
>>> What's interesting, is that Asus board with the same chipset doesn't
>>> expose MSI support at all:
>>>
>>> ahci0 at pci0:0:17:0:      class=0x010601 card=0x43911002 chip=0x43911002
>>> rev=0x00 hdr=0x00
>>>     vendor     = 'ATI Technologies Inc. / Advanced Micro Devices, Inc.'
>>>     device     = 'SB700 SATA Controller [AHCI mode]'
>>>     class      = mass storage
>>>     subclass   = SATA
>>>     bar   [10] = type I/O Port, range 32, base 0xc000, size  8, enabled
>>>     bar   [14] = type I/O Port, range 32, base 0xb000, size  4, enabled
>>>     bar   [18] = type I/O Port, range 32, base 0xa000, size  8, enabled
>>>     bar   [1c] = type I/O Port, range 32, base 0x9000, size  4, enabled
>>>     bar   [20] = type I/O Port, range 32, base 0x8000, size 16, enabled
>>>     bar   [24] = type Memory, range 32, base 0xfbcffc00, size 1024, enabled
>>>     cap 01[60] = powerspec 2  supports D0 D3  current D0
>>>     cap 12[70] = SATA Index-Data Pair
>>>
>> 
>> PCI revision register of SMBus device (0:20:0) gives a particular revision of SB7x0.
>> SB700 RPR document (section 7.11) says that MSI capability should be disabled if
>> the revision is 0x39 or 0x3a, it should be enabled for newer revisions (0x3b, 03c).
>
>VIA uses ISA bridge to identify chipset, ATI (as you said) - SMBus.
>Hell! Why not to do it properly?
>
>> Those who like to experiment with potentially dangerous things may try playing
>> with bit 16 of PCI config register 0x50 of SATA controller device.
>
>I would prefer it was done by BIOS. Probably ASUS did it, as my board
>has 0x3a.

Ok while we are talking about ahci(4) on IXP700...  Can anyone reproduce
the `test unit ready' bug on one of those?  Since I saw no reply to
my post,
	http://docs.freebsd.org/cgi/mid.cgi?201001231407.o0NE7l8j002620
maybe the bug is controller-specific?  How to reproduce:  just try
	camcontrol tur adaX
or
	cdrecord -scanbus
or (at least I think this is the same issue) start xfburn without hal
running, then watch for the bus to hang at the next disk access.
(Also leaving the disk led on solid here.)  With the previous patch,
	http://people.freebsd.org/~mav/cam-ata.20100119.patch
(haven't tested the latest one yet) at least it now seems to recover
after some timeout, leaving this in dmesg:  (sorry I didn't notice
when I first tried, guess I didn't wait long enough...)

ahcich2: Timeout on slot 20
ahcich2: is 04000000 cs 00100000 ss 00100000 rs 00100000 tfd 451 serr 00400000
ahcich2: AHCI reset...
ahcich2: hardware reset ...
ahcich2: SATA connect time=0ms status=00000123
ahcich2: ready wait time=11ms
ahcich2: AHCI reset done: device found
(ada1:ahcich2:0:0:0): Command timed out
(ada1:ahcich2:0:0:0): Retrying Command

 And pciconf here looks like this:

ahci0 at pci0:0:17:0:	class=0x010601 card=0xb0021458 chip=0x43911002 rev=0x00 hdr=0x00
    vendor     = 'ATI Technologies Inc. / Advanced Micro Devices, Inc.'
    device     = 'SB700 SATA Controller [AHCI mode]'
    class      = mass storage
    subclass   = SATA
    bar   [10] = type I/O Port, range 32, base 0xff00, size  8, enabled
    bar   [14] = type I/O Port, range 32, base 0xfe00, size  4, enabled
    bar   [18] = type I/O Port, range 32, base 0xfd00, size  8, enabled
    bar   [1c] = type I/O Port, range 32, base 0xfc00, size  4, enabled
    bar   [20] = type I/O Port, range 32, base 0xfb00, size 16, enabled
    bar   [24] = type Memory, range 32, base 0xfe02f000, size 1024, enabled

 Thanx,
	Juergen