Date: Thu, 17 Nov 2011 09:29:32 -0800 From: Maksim Yevmenkin <emax@freebsd.org> To: Alexander Motin <mav@freebsd.org> Cc: current@freebsd.org Subject: Re: [RFC] ahci(4) patch Message-ID: <CAFPOs6qiaQ7L73GLsjVHWR2r-rY3qai%2B9%2BT=hLjFo-Vqo1CuOQ@mail.gmail.com> In-Reply-To: <4EC53E28.2030609@FreeBSD.org> References: <CAFPOs6rU6AKeTNzKhaqxktDb9CN=g-EDMLf2%2Bcyvhq772SymjA@mail.gmail.com> <4EC43ABA.7060407@FreeBSD.org> <CAFPOs6qyC%2B_8CrxyoCpXBOTTXbgo=vozLNSzHhsH4Hw=jgvERg@mail.gmail.com> <4EC4404B.4070008@FreeBSD.org> <CAFPOs6qAXYQzeD6yP0cuayp8VDuZky%2BZAGyux=5__A0EqSH1Dg@mail.gmail.com> <4EC531A4.4000803@FreeBSD.org> <CAFPOs6pnSs0DZODMQOStvQnf_OQKnhOp1YF2_17kMEa2ri7-wg@mail.gmail.com> <4EC53E28.2030609@FreeBSD.org>
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On Thu, Nov 17, 2011 at 9:02 AM, Alexander Motin <mav@freebsd.org> wrote: > On 11/17/11 18:35, Maksim Yevmenkin wrote: >> On Thu, Nov 17, 2011 at 8:09 AM, Alexander Motin <mav@freebsd.org> wrote= : >>> On 11/17/11 01:08, Maksim Yevmenkin wrote: >>>> On Wed, Nov 16, 2011 at 2:59 PM, Alexander Motin <mav@freebsd.org> wro= te: >>>>> On 17.11.2011 00:44, Maksim Yevmenkin wrote: >>>>>> >>>>>> On Wed, Nov 16, 2011 at 2:35 PM, Alexander Motin<mav@freebsd.org> = =A0wrote: >>>>>>> >>>>>>> On 16.11.2011 23:59, Maksim Yevmenkin wrote: >>>>>>>> >>>>>>>> would anyone object to the following ahci(4) patch? >>>>>>>> >>>>>>>> =3D=3D >>>>>>>> >>>>>>>> --- ahci.c.orig 2011-11-16 21:35:26.000000000 +0000 >>>>>>>> +++ ahci.c =A0 =A0 =A02011-11-16 21:35:41.000000000 +0000 >>>>>>>> @@ -500,7 +500,7 @@ >>>>>>>> =A0 =A0 =A0 =A0for (unit =3D 0; unit< =A0 =A0ctlr->channels; unit+= +) { >>>>>>>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if ((ctlr->ichannels& =A0 =A0(1<< = =A0 =A0unit)) =3D=3D 0) >>>>>>>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0continue; >>>>>>>> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 child =3D device_add_child(dev, "ahc= ich", -1); >>>>>>>> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 child =3D device_add_child(dev, "ahc= ich", unit); >>>>>>>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (child =3D=3D NULL) >>>>>>>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0device_printf(dev, = "failed to add channel >>>>>>>> device\n"); >>>>>>>> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0else >>>>>>>> >>>>>>>> =3D=3D >>>>>>>> >>>>>>>> the idea is to have "static" numbering for ada(4) disks. >>>>>>> >>>>>>> I do. The only way I see this useful is if you have BIOS configured= for >>>>>>> non-hot-swappable disks, in which case you have some AHCI channels >>>>>>> disabled, >>>>>>> but want to keep numbers of the rest. While I don't like this mode = in >>>>>>> general, especially when it can't be disabled, that patch could be = useful >>>>>>> in >>>>>>> these cases. But in other cases, when you have several AHCI control= lers, >>>>>>> it >>>>>>> just wont not work. You will receive error on attempt to create sec= ond >>>>>>> ahcich0. >>>>>> >>>>>> shouldn't achcichX be destroyed when disk is detached/removed/etc.? >>>>> >>>>> List of implemented AHCI channels to expose as ahcichX set by BIOS in >>>>> vendor-specific way, but only during boot and not by many BIOSes. Des= troying >>>>> them on disk detach theoretically possible, but IMHO not right, as bu= s >>>>> doesn't disappear on disk disconnect. >>>>> >>>>>> the particular problem i'm trying to address is disk re-numbering wh= en >>>>>> one of the disks fails/removed/etc. i'm trying to use hints to wire >>>>>> disks to controllers/busses. it works perfectly fine with da(4) disk= s >>>>>> (even hot swappable ones) , but i can not make it to work with ada(4= ) >>>>>> disks. i'm perfectly fine to hid this under some sort of option >>>>>> (something similar to ATA_STATIC_ID, AHCI_STATIC_ID for example) >>>>> >>>>> Wiring works for adaX also, unless your BIOS is so "intelligent" to r= eport >>>>> unconnected ports and not impliemented.. You should just wire CAM bus= es to >>>>> ahcichX, not to ahciX. It could be done in other way changing just by= one >>>>> line around xpt_bus_register(), but now it is done so. >>>> >>>> ok. then i must be missing something, here is what i have in device.hi= nts >>>> >>>> hint.scbus.0.at=3D"umass-sim0" >>>> hint.scbus.1.at=3D"ahcich0" >>>> hint.scbus.2.at=3D"ahcich1" >>>> hint.scbus.3.at=3D"ahcich2" >>>> hint.scbus.4.at=3D"ahcich3" >>>> hint.scbus.5.at=3D"ahcich4" >>>> hint.scbus.6.at=3D"ahcich5" >>>> >>>> hint.da.0.at=3D"scbus0" >>>> hint.ada.0.at=3D"scbus1" >>>> hint.ada.1.at=3D"scbus2" >>>> hint.ada.2.at=3D"scbus3" >>>> hint.ada.3.at=3D"scbus4" >>>> hint.ada.4.at=3D"scbus5" >>>> hint.ada.5.at=3D"scbus6" >>>> >>>> this is for 6-port ahci(4) compatible controller (intel) on the >>>> motherboard. no matter which achi(4) ports are connected, resulted >>>> adaX devices are always sequential starting from ada0. so, the >>>> question is: what am i doing wrong here? >>> >>> Just put your lines into my loader.conf and got this: >>> >>> %camcontrol devlist -v >>> scbus1 on ahcich0 bus 0: >>> <INTEL SSDSA2M080G2GC 2CV102M3> =A0 =A0at scbus1 target 0 lun 0 (pass0,= ada0) >>> <> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 at s= cbus1 target -1 lun -1 () >>> scbus2 on ahcich1 bus 0: >>> <> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 at s= cbus2 target -1 lun -1 () >>> scbus3 on ahcich2 bus 0: >>> <INTEL SSDSA2M080G2GC 2CV102M3> =A0 =A0at scbus3 target 0 lun 0 (pass1,= ada2) >>> <> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 at s= cbus3 target -1 lun -1 () >>> scbus4 on ahcich3 bus 0: >>> <> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 at s= cbus4 target -1 lun -1 () >>> scbus5 on ahcich4 bus 0: >>> <> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 at s= cbus5 target -1 lun -1 () >>> scbus6 on ahcich5 bus 0: >>> <> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 at s= cbus6 target -1 lun -1 () >>> ... >>> >>> I see no problem. What am I doing wrong? >>> >>> Let me repeat question not asked directly: Does your BIOS reports unuse= d >>> AHCI channels as implemented? Do you always have all 6 ahcich devices o= r >>> not? >> >> i not exactly sure. below is the relevant dmesg. as far as i can tell, >> channels are correct, however, ahcich numbering is sequential and that >> is why hints dont work. >> >> Nov 17 09:22:51 PREPROD-red1 kernel: ahci0: <Intel Cougar Point AHCI >> SATA controller> port >> 0xf070-0xf077,0xf060-0xf063,0xf050-0xf057,0xf040-0xf043,0xf000-0xf01f >> mem 0xfbb21000-0xfbb217ff irq 19 at device 31.2 on pci0 >> Nov 17 09:22:51 PREPROD-red1 kernel: ahci0: attempting to allocate 1 >> MSI vectors (1 supported) >> Nov 17 09:22:51 PREPROD-red1 kernel: ahci0: using IRQ 270 for MSI >> Nov 17 09:22:51 PREPROD-red1 kernel: ahci0: AHCI v1.30 with 6 6Gbps >> ports, Port Multiplier not supported >> Nov 17 09:22:51 PREPROD-red1 kernel: ahci0: Caps: 64bit NCQ SNTF AL >> CLO 6Gbps PMD SSC PSC 32cmd EM 6ports >> Nov 17 09:22:51 PREPROD-red1 kernel: ahci0: Caps2: APST >> Nov 17 09:22:51 PREPROD-red1 kernel: ahci0: EM Caps: ALHD XMT SMB LED >> Nov 17 09:22:51 PREPROD-red1 kernel: ahcich0: <AHCI channel> at >> channel 0 on ahci0 >> Nov 17 09:22:51 PREPROD-red1 kernel: ahcich0: Caps: >> Nov 17 09:22:51 PREPROD-red1 kernel: ahcich1: <AHCI channel> at >> channel 2 on ahci0 >> Nov 17 09:22:51 PREPROD-red1 kernel: ahcich1: Caps: >> Nov 17 09:22:51 PREPROD-red1 kernel: ahcich2: <AHCI channel> at >> channel 5 on ahci0 >> Nov 17 09:22:51 PREPROD-red1 kernel: ahcich2: Caps: > > Yes, that's it. You should have six ahcichX devices, but have only three > - only for connected devices. Some vendors (Supermicro was first I've > heard about) last time randomly started to make BIOS mark unused AHCI > channels as unimplemented. Sometimes it can be configured in BIOS setup > (it may be called like "hot-swappable"), sometimes not. I believe that > is wrong AHCI spec interpretation. > > If it is not configurable in BIOS, we could add respective hint to the > ahci(4) to allow user ignore these fake "implemented" flags to always > present all possible ports, but it is direct AHCI spec violation. aha! yes, there is a bios option for each sata port that is called hot plug: enable/disable. each sata port had "hot plug" disabled by default. after i enabled it, it started to work as expected. thanks! and, yes, it is a supermicro motherboard. thanks max
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