Re: [Qemu-devel] [PATCH 09/11] ACPI: move PRST OperationRegion into SSDT

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Dec 23, 2013 at 02:06:27PM +0100, Igor Mammedov wrote:
> On Mon, 23 Dec 2013 13:26:37 +0200
> "Michael S. Tsirkin" <mst@redhat.com> wrote:
> 
> > On Sun, Dec 22, 2013 at 03:51:28PM +0100, Igor Mammedov wrote:
> > > On Mon, 16 Dec 2013 21:53:07 +0200
> > > "Michael S. Tsirkin" <mst@redhat.com> wrote:
> > > 
> > > > On Fri, Dec 13, 2013 at 05:22:14PM +0100, Igor Mammedov wrote:
> > > > > .. and report range used by it to OSPM via _CRS.
> > > > > PRST is needed in SSDT since its base will depend on
> > > > > chipset and will be dynamically set by QEMU.
> > > > > Also move PRSC() method along with PRST since cross
> > > > > table reference to PRST doesn't work.
> > > > > 
> > > > > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > > > > ---
> > > > >  hw/i386/acpi-dsdt-cpu-hotplug.dsl | 39 +----------------------
> > > > >  hw/i386/acpi-dsdt.dsl             |  2 +-
> > > > >  hw/i386/q35-acpi-dsdt.dsl         |  2 +-
> > > > >  hw/i386/ssdt-misc.dsl             | 65 +++++++++++++++++++++++++++++++++++++++
> > > > >  4 files changed, 68 insertions(+), 40 deletions(-)
> > > > > 
> > > > > diff --git a/hw/i386/acpi-dsdt-cpu-hotplug.dsl b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> > > > > index 995b415..f26f81b 100644
> > > > > --- a/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> > > > > +++ b/hw/i386/acpi-dsdt-cpu-hotplug.dsl
> > > > > @@ -20,6 +20,7 @@
> > > > >  Scope(\_SB) {
> > > > >      /* Objects filled in by run-time generated SSDT */
> > > > >      External(NTFY, MethodObj)
> > > > > +    External(\_SB.CPHD.PRSC, MethodObj)
> > > > >      External(CPON, PkgObj)
> > > > >  
> > > > >      /* Methods called by run-time generated SSDT Processor objects */
> > > > > @@ -51,42 +52,4 @@ Scope(\_SB) {
> > > > >          // _EJ0 method - eject callback
> > > > >          Sleep(200)
> > > > >      }
> > > > > -
> > > > > -    OperationRegion(PRST, SystemIO, 0xaf00, 32)
> > > > > -    Field(PRST, ByteAcc, NoLock, Preserve) {
> > > > > -        PRS, 256
> > > > > -    }
> > > > > -    Method(PRSC, 0) {
> > > > > -        // Local5 = active cpu bitmap
> > > > > -        Store(PRS, Local5)
> > > > > -        // Local2 = last read byte from bitmap
> > > > > -        Store(Zero, Local2)
> > > > > -        // Local0 = Processor ID / APIC ID iterator
> > > > > -        Store(Zero, Local0)
> > > > > -        While (LLess(Local0, SizeOf(CPON))) {
> > > > > -            // Local1 = CPON flag for this cpu
> > > > > -            Store(DerefOf(Index(CPON, Local0)), Local1)
> > > > > -            If (And(Local0, 0x07)) {
> > > > > -                // Shift down previously read bitmap byte
> > > > > -                ShiftRight(Local2, 1, Local2)
> > > > > -            } Else {
> > > > > -                // Read next byte from cpu bitmap
> > > > > -                Store(DerefOf(Index(Local5, ShiftRight(Local0, 3))), Local2)
> > > > > -            }
> > > > > -            // Local3 = active state for this cpu
> > > > > -            Store(And(Local2, 1), Local3)
> > > > > -
> > > > > -            If (LNotEqual(Local1, Local3)) {
> > > > > -                // State change - update CPON with new state
> > > > > -                Store(Local3, Index(CPON, Local0))
> > > > > -                // Do CPU notify
> > > > > -                If (LEqual(Local3, 1)) {
> > > > > -                    NTFY(Local0, 1)
> > > > > -                } Else {
> > > > > -                    NTFY(Local0, 3)
> > > > > -                }
> > > > > -            }
> > > > > -            Increment(Local0)
> > > > > -        }
> > > > > -    }
> > > > >  }
> > > > > diff --git a/hw/i386/acpi-dsdt.dsl b/hw/i386/acpi-dsdt.dsl
> > > > > index 90efce0..fa9f2d4 100644
> > > > > --- a/hw/i386/acpi-dsdt.dsl
> > > > > +++ b/hw/i386/acpi-dsdt.dsl
> > > > > @@ -311,7 +311,7 @@ DefinitionBlock (
> > > > >          }
> > > > >          Method(_E02) {
> > > > >              // CPU hotplug event
> > > > > -            \_SB.PRSC()
> > > > > +            \_SB.CPHD.PRSC()
> > > > >          }
> > > > >          Method(_L03) {
> > > > >          }
> > > > > diff --git a/hw/i386/q35-acpi-dsdt.dsl b/hw/i386/q35-acpi-dsdt.dsl
> > > > > index 22baa58..9ccc543 100644
> > > > > --- a/hw/i386/q35-acpi-dsdt.dsl
> > > > > +++ b/hw/i386/q35-acpi-dsdt.dsl
> > > > > @@ -420,7 +420,7 @@ DefinitionBlock (
> > > > >          }
> > > > >          Method(_E02) {
> > > > >              // CPU hotplug event
> > > > > -            \_SB.PRSC()
> > > > > +            \_SB.CPHD.PRSC()
> > > > >          }
> > > > >          Method(_L03) {
> > > > >          }
> > > > > diff --git a/hw/i386/ssdt-misc.dsl b/hw/i386/ssdt-misc.dsl
> > > > > index a4484b8..ec8893c 100644
> > > > > --- a/hw/i386/ssdt-misc.dsl
> > > > > +++ b/hw/i386/ssdt-misc.dsl
> > > > > @@ -116,4 +116,69 @@ DefinitionBlock ("ssdt-misc.aml", "SSDT", 0x01, "BXPC", "BXSSDTSUSP", 0x1)
> > > > >              }
> > > > >          }
> > > > >      }
> > > > > +    Scope(\_SB) {
> > > > > +        External(NTFY, MethodObj)
> > > > > +        External(CPON, PkgObj)
> > > > > +
> > > > > +        Device(CPHD) {
> > > > > +            Name(_HID, EISAID("PNP0C08"))
> > > > > +            Name(CPPL, 32) // cpu-gpe length
> > > > > +            Name(CPHP, 0xaf00)
> > > > > +
> > > > > +            OperationRegion(PRST, SystemIO, CPHP, CPPL)
> > > > > +            Field(PRST, ByteAcc, NoLock, Preserve) {
> > > > > +                PRS, 256
> > > > > +            }
> > > > > +
> > > > > +            Method(PRSC, 0) {
> > > > > +                // Local5 = active cpu bitmap
> > > > > +                Store(PRS, Local5)
> > > > > +                // Local2 = last read byte from bitmap
> > > > > +                Store(Zero, Local2)
> > > > > +                // Local0 = Processor ID / APIC ID iterator
> > > > > +                Store(Zero, Local0)
> > > > > +                While (LLess(Local0, SizeOf(CPON))) {
> > > > > +                    // Local1 = CPON flag for this cpu
> > > > > +                    Store(DerefOf(Index(CPON, Local0)), Local1)
> > > > > +                    If (And(Local0, 0x07)) {
> > > > > +                        // Shift down previously read bitmap byte
> > > > > +                        ShiftRight(Local2, 1, Local2)
> > > > > +                    } Else {
> > > > > +                        // Read next byte from cpu bitmap
> > > > > +                        Store(DerefOf(Index(Local5, ShiftRight(Local0, 3))), Local2)
> > > > > +                    }
> > > > > +                    // Local3 = active state for this cpu
> > > > > +                    Store(And(Local2, 1), Local3)
> > > > > +
> > > > > +                    If (LNotEqual(Local1, Local3)) {
> > > > > +                        // State change - update CPON with new state
> > > > > +                        Store(Local3, Index(CPON, Local0))
> > > > > +                        // Do CPU notify
> > > > > +                        If (LEqual(Local3, 1)) {
> > > > > +                            NTFY(Local0, 1)
> > > > > +                        } Else {
> > > > > +                            NTFY(Local0, 3)
> > > > > +                        }
> > > > > +                    }
> > > > > +                    Increment(Local0)
> > > > > +                }
> > > > > +            }
> > > > > +
> > > > > +            /* Leave bit 0 cleared to avoid Windows BSOD */
> > > > > +            Name(_STA, 0xA)
> > > > 
> > > > This shared the problem you yourself pointed out with
> > > > patch 'pc: ACPI BIOS: implement memory hotplug':
> > > > if we make device non present ospm can ignore our _CRS.
> > > > 
> > > > Can't we get a better handle on why windows crashes?
> > > Whenever _CRS with PRST IO range is exposed as part of PNP0A05/PNP0A06 or
> > > ACPI0004 device, it BSODs with INACCESSIBLE_BOOT_DEVICE with following stack:
> > > : nt!PnpBootDeviceWait+0x181
> > > : nt!IopInitializeBootDrivers+0xbd3
> > > : nt!IoInitSystem+0xbb6
> > > : nt!Phase1InitializationDiscard+0x16f6
> > > : nt!Phase1Initialization+0x13
> > > : nt!PspSystemThreadStartup+0x23d
> > > : nt!KiStartSystemThread+0x16
> > 
> > 
> > Interesting. This seems to imply that it can't access
> > IO port for the disk. Which boot disk type are you using?
> > Is the _CRS resource overlapping any other resource
> > by any chance?
> Yes, I've dug in the issue more and it is indeed _CRS overlapping with PCI bus.
> PCI bus's IO ports are statically defined in acpi-dsdt-pci-crs.dsl and
> basically take all io ports except of 0xcf8-0xcff hole.
> Since PIIX4_PM and ICH9 LPC are PCI devices, it appears that PRST already
> covered by bus CRS, the same applies to PCI hotplug as well.
> So I was doing it wrong trying advertise bus resources out of bus scope.

Yes, that's explicitly prohibited by the firmware specification.

> What we need is to add PIIX4_PM/ICH9 LPC device definition with consumed IO
> ports CRS to PCI bus. Question is what PNP IDs they should use?
> 
> It looks pretty much out of scope of cpu_hotplug and should be done for
> pci hotplug as well. So I'm ditching ACPI device and CRS parts from this
> series as not directly related.
> Adding PIIX4_PM/ICH9 LPC ACPI device could be done later and preferably
> for all resources consumed by it to make it right.

Could be ok but are we using any new ports?
If yes then I think before doing that we should make sure _CRS for
the host bridge does not include them, or consume them
in some child device.
Otherwise we increase the chance of a conflict in case some
guest uses that port.

> 
> > 
> > > 
> > > However it works fine if containing device is PNP0C02 "Motherboard registers",
> > > so we probably should use it instead.
> > > 
> > > 
> > > > 
> > > > 
> > > > > +
> > > > > +            Method(_CRS, 0) {
> > > > > +                Store(ResourceTemplate() {
> > > > > +                    IO(Decode16, 0x00, 0x00, 0x01, 0x15, IO)
> > > > > +                }, Local0)
> > > > > +
> > > > > +                CreateWordField(Local0, IO._MIN, IOMN)
> > > > > +                CreateWordField(Local0, IO._MAX, IOMX)
> > > > > +
> > > > > +                Store(CPHP, IOMN)
> > > > > +                Subtract(Add(CPHP, CPPL), 1, IOMX)
> > > > > +                Return(Local0)
> > > > > +            }
> > > > > +        } // Device(CPHD)
> > > > > +    } // Scope(\_SB)
> > > > >  }
> > > > > -- 
> > > > > 1.8.3.1
> > > > 
> > > 
> > > 
> > > -- 
> > > Regards,
> > >   Igor
> 
> 
> -- 
> Regards,
>   Igor