Re: [PATCH v3 4/5] acpi/nvdimm: Implement ACPI NVDIMM Label Methods

[Igor Mammedov <imammedo@redhat.com>]

On Tue, 20 Sep 2022 20:28:31 +0800
Robert Hoo <robert.hu@linux.intel.com> wrote:

> On Tue, 2022-09-20 at 11:13 +0200, Igor Mammedov wrote:
> > On Fri, 16 Sep 2022 21:15:35 +0800
> > Robert Hoo <robert.hu@linux.intel.com> wrote:
> >   
> > > On Fri, 2022-09-16 at 09:37 +0200, Igor Mammedov wrote:
> > >   
> > > > > Fine, get your point now.
> > > > > In ASL it will look like this:
> > > > >                     Local1 = Package (0x3) {STTS, SLSA, MAXT}
> > > > >                     Return (Local1)    
> > > > 
> > > >     
> > > > > 
> > > > > But as for 
> > > > >                     CreateDWordField (Local0, Zero, STTS)  //
> > > > > Status
> > > > >                     CreateDWordField (Local0, 0x04, SLSA)  //
> > > > > SizeofLSA
> > > > >                     CreateDWordField (Local0, 0x08, MAXT)  //
> > > > > Max
> > > > > Trans
> > > > > 
> > > > > I cannot figure out how to substitute with LocalX. Can you shed
> > > > > more
> > > > > light?    
> > > > 
> > > > Leave this as is, there is no way to make it anonymous/local with
> > > > FooField.
> > > > 
> > > > (well one might try to use Index and copy field's bytes into a
> > > > buffer
> > > > and
> > > > then explicitly convert to Integer, but that's a rather
> > > > convoluted
> > > > way
> > > > around limitation so I'd not go this route)
> > > >     
> > > 
> > > OK, pls. take a look, how about this?
> > > 
> > > Method (_LSI, 0, Serialized)  // _LSI: Label Storage Information
> > > {   
> > >     Local0 = NCAL (ToUUID("4309ac30-0d11-11e4-9191-0800200c9a66"),
> > > 0x02, 0x04, Zero, One)    // Buffer
> > >     CreateDWordField (Local0, Zero, STTS)  // Status
> > >     CreateDWordField (Local0, 0x04, SLSA)  // Size of LSA
> > >     CreateDWordField (Local0, 0x08, MAXT)  // Max Transfer Size
> > >     Local1 = Package (0x3) {STTS, SLSA, MAXT}
> > >     Return (Local1)
> > > }
> > > 
> > > Method (_LSR, 2, Serialized)  // _LSR: Label Storage Read
> > > {
> > >     Name (INPT, Buffer(8) {})
> > >     CreateDWordField (INPT, Zero, OFST);
> > >     CreateDWordField (INPT, 4, LEN);  
> > 
> > why do you have to create and use INPT, wouldn't local be enough to
> > keep the buffer?  
> 
> If substitute INPT with LocalX, then later
> Local0 = Package (0x01) {LocalX} isn't accepted.
> 
> PackageElement :=
> DataObject | NameString

ok, then respin series and lets get it some testing.

BTW:
it looks like Windows Server starting from v2019 has support for
NVDIMM-P devices which came with 'Optane DC Persistent Memory Modules'
but it fails to recognize NVDIMMs in QEMU (complaining something about
wrong target). Perhaps you can reach someone with Optane/ACPI
expertise within your org and try to fix QEMU side.

> >   
> > >     OFST = Arg0
> > >     LEN = Arg1
> > >     Local0 = Package (0x01) {INPT}
> > >     Local3 = NCAL (ToUUID("4309ac30-0d11-11e4-9191-0800200c9a66"),
> > > 0x02, 0x05, Local0, One)
> > >     CreateDWordField (Local3, Zero, STTS)
> > >     CreateField (Local3, 32, LEN << 3, LDAT)
> > >     Local1 = Package (0x2) {STTS, toBuffer(LDAT)}
> > >     Return (Local1)
> > > }
> > > 
> > > Method (_LSW, 3, Serialized)  // _LSW: Label Storage Write
> > > {
> > >     Local2 = Arg2
> > >     Name (INPT, Buffer(8) {})  
> > 
> > ditto
> >   
> > >     CreateDWordField (INPT, Zero, OFST);
> > >     CreateDWordField (INPT, 4, TLEN);
> > >     OFST = Arg0
> > >     TLEN = Arg1
> > >     Concatenate(INPT, Local2, INPT)
> > >     Local0 = Package (0x01)
> > >     {
> > >         INPT
> > >     }
> > >     Local3 = NCAL (ToUUID ("4309ac30-0d11-11e4-9191-0800200c9a66"),
> > > 0x02, 0x06, Local0, One)
> > >     CreateDWordField (Local3, 0, STTS)
> > >     Return (STTS)
> > > }  
> 
>