freebsd stable - Jun 2010 - AHCI timeouts - 8.1-PRERELEASE

Is it expected behaviour that ahci performs a time-out during boot, even
though camcontrol indicates success?  This is on 8.1-PRERELEASE csup'ed
today.

I've enclosed  dmesg, camcontrol and pciconf information.  The timeout is 
approximately 12 to 14 seconds for each connected disk-drive.  If I 
run with only usb devices, there are no timeouts.  The following 
dmesg is when I connect two HDD's on a VIA SN18000 motherboard, and 
the BIOS has ahci selected, i.e. not IDE nor RAID. 

These machines are personal servers and are permanently running.

# dmesg | egrep -i "ahci|ada"
ahci0: <VIA VT8251 AHCI SATA controller> port
0xdc00-0xdc07,0xd880-0xd883,0xd800-0xd807,0xd480-0xd483,0xd400-0xd40f mem
0xfcfffc00-0xfcffffff irq 21 at device 15.0 on pci0
ahci0: [ITHREAD]
ahci0: AHCI v1.00 with 4 3Gbps ports, Port Multiplier supported
ahcich0: <AHCI channel> at channel 0 on ahci0
ahcich0: [ITHREAD]
ahcich1: <AHCI channel> at channel 1 on ahci0
ahcich1: [ITHREAD]
ahcich2: <AHCI channel> at channel 2 on ahci0
ahcich2: [ITHREAD]
ahcich3: <AHCI channel> at channel 3 on ahci0
ahcich3: [ITHREAD]
ahcich0: Poll timeout on slot 0
ahcich0: is 00800000 cs 00000001 ss 00000000 rs 00000001 tfd 1d0 serr
00000000
ahcich1: Poll timeout on slot 0
ahcich1: is 00800000 cs 00000001 ss 00000000 rs 00000001 tfd 1d0 serr
00000000
ada0 at ahcich0 bus 0 scbus0 target 0 lun 0da1 at umass-sim1 bus 1 scbus5
target 0 lun 0
ada0: <WDC WD5000AAKS-00V1A0 05.01D05> ATA-8 SATA 2.x device
ada0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada0: Command Queueing enabled
ada0: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
ada1 at ahcich1 bus 0 scbus1 target 0 lun 0
...and ada1 is similar to ada0 above.

# camcontrol devlist
<WDC WD5000AAKS-00V1A0 05.01D05>   at scbus0 target 0 lun 0 (ada0,pass0)
<WDC WD5000AAKS-00V1A0 05.01D05>   at scbus1 target 0 lun 0 (ada1,pass1)
<Kingston DT HyperX HMAP>          at scbus4 target 0 lun 0 (da0,pass2)
<Kingston DT Mini Slim 1.00>       at scbus5 target 0 lun 0 (da1,pass3)

# pciconf -lv | grep -A 4 ahci
ahci0@pci0:0:15:0:      class=0x010601 card=0x62871106 chip=0x62871106
rev=0x20 hdr=0x00
    vendor     = 'VIA Technologies, Inc.'
    device     = 'VT8251 AHCI Controller'
    class      = mass storage
    subclass   = SATA

If there's anything that I can provide to help, please advise.
Regards, Phil.

Hi.

Phil wrote:
> Is it expected behaviour that ahci performs a time-out during boot, even
> though camcontrol indicates success?  This is on 8.1-PRERELEASE csup'ed
> today.
> 
> I've enclosed  dmesg, camcontrol and pciconf information.  The timeout
is
> approximately 12 to 14 seconds for each connected disk-drive.  If I 
> run with only usb devices, there are no timeouts.  The following 
> dmesg is when I connect two HDD's on a VIA SN18000 motherboard, and 
> the BIOS has ahci selected, i.e. not IDE nor RAID. 
> 
> # pciconf -lv | grep -A 4 ahci
> ahci0@pci0:0:15:0:      class=0x010601 card=0x62871106 chip=0x62871106
> rev=0x20 hdr=0x00
>     vendor     = 'VIA Technologies, Inc.'
>     device     = 'VT8251 AHCI Controller'
>     class      = mass storage
>     subclass   = SATA
It seems like timeout during Port Multiplier probe. I don't have such
chip to test it, but I can see that Linux disables PMP and NCQ support
for it. You may try it in different combinations by adding to respective
line in device list in the beginning of the ahci.c quirks AHCI_Q_NOPMP
and AHCI_Q_NONCQ. Instead of AHCI_Q_NONCQ (if it is needed for you) you
may try to set AHCI_Q_EDGEIS. Report me please about the result.

-- 
Alexander Motin