Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by using CPUID(0x15) TSC leaf

["Zeng, Star" <star.zeng@intel.com>]

Remember to add entry for it at https://github.com/tianocore/tianocore.github.io/wiki/EDK-II-Release-Planning.

> -----Original Message-----
> From: Gao, Liming
> Sent: Tuesday, August 20, 2019 7:56 PM
> To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>; Chan, Amy
> <amy.chan@intel.com>; Chaganty, Rangasai V
> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li, Kevin Y
> <kevin.y.li@intel.com>; leif.lindholm@linaro.org; afish@apple.com; Kinney,
> Michael D <michael.d.kinney@intel.com>
> Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library by
> using CPUID(0x15) TSC leaf
> 
> Donald:
>   Thanks for your update. If no other comment, I will help push this patch
> tomorrow.
> 
> Thanks
> Liming
> > -----Original Message-----
> > From: Kuo, Donald
> > Sent: Tuesday, August 20, 2019 3:22 PM
> > To: Gao, Liming <liming.gao@intel.com>; devel@edk2.groups.io;
> > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC library
> > by using CPUID(0x15) TSC leaf
> >
> > Hi Liming,
> >
> > Done.
> >
> > Patch is attached to
> > https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> >
> > Another BZ to apply CpuTimerLib will be tracking on:
> > https://bugzilla.tianocore.org/show_bug.cgi?id=2096
> >
> > Thanks,
> > Donald
> >
> > > -----Original Message-----
> > > From: Gao, Liming
> > > Sent: Tuesday, August 20, 2019 2:51 PM
> > > To: Kuo, Donald <donald.kuo@intel.com>; devel@edk2.groups.io;
> > > lersek@redhat.com; Dong, Eric <eric.dong@intel.com>
> > > Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>; Li,
> > > Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > library by using CPUID(0x15) TSC leaf
> > >
> > > Donald:
> > >   Please also attach the patch linker in BZs.
> > >
> > >   And, please submit another BZ for edk2-
> > > platforms\Platform\Intel\KabylakeOpenBoardPkg to apply this new
> > > library instance.
> > >
> > > Thanks
> > > Liming
> > > >-----Original Message-----
> > > >From: Kuo, Donald
> > > >Sent: Tuesday, August 20, 2019 10:44 AM
> > > >To: devel@edk2.groups.io; lersek@redhat.com; Gao, Liming
> > > ><liming.gao@intel.com>; Dong, Eric <eric.dong@intel.com>
> > > >Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > >Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > ><rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>;
> > > >Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > >afish@apple.com; Kinney, Michael D <michael.d.kinney@intel.com>
> > > >Subject: RE: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > >library by using CPUID(0x15) TSC leaf
> > > >
> > > >Thanks Laszlo help to review and great feedbacks. That we did miss
> > > >to fulfil
> > > BZ.
> > > >
> > > >I had updated Bugzilla
> > > >https://bugzilla.tianocore.org/show_bug.cgi?id=1909
> > > >for more documentation.
> > > >
> > > >As I know for the edk2-platforms should be consumed as KBL (7th
> > > >Generation) platform in Client, and this feature based on SDM is
> > > >supported on SKL (6th Generation, Family 06h) onwards. So it's ok
> > > >to use as TimerLib instances for edk2-platforms.
> > > >
> > > >And I think the library is new instances for TimerLib for supported
> > > >CPU, and those non-supported CPU will still keep using AcpiTimerlib
> > > >as TimerLib instances.
> > > >
> > > >Thanks,
> > > >Donald
> > > >
> > > >> -----Original Message-----
> > > >> From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On
> > > >> Behalf Of Laszlo Ersek
> > > >> Sent: Saturday, August 17, 2019 4:40 AM
> > > >> To: Gao, Liming <liming.gao@intel.com>; Kuo, Donald
> > > >> <donald.kuo@intel.com>; Dong, Eric <eric.dong@intel.com>;
> > > >> devel@edk2.groups.io
> > > >> Cc: Ni, Ray <ray.ni@intel.com>; Zeng, Star <star.zeng@intel.com>;
> > > >> Chan, Amy <amy.chan@intel.com>; Chaganty, Rangasai V
> > > >> <rangasai.v.chaganty@intel.com>; Lai, Luke <luke.lai@intel.com>;
> > > >> Li, Kevin Y <kevin.y.li@intel.com>; leif.lindholm@linaro.org;
> > > >> afish@apple.com;
> > > >Kinney,
> > > >> Michael D <michael.d.kinney@intel.com>
> > > >> Subject: Re: [edk2-devel] [PATCH] UefiCpuPkg: Adding a new TSC
> > > >> library by using CPUID(0x15) TSC leaf
> > > >>
> > > >> On 08/16/19 18:16, Laszlo Ersek wrote:
> > > >> > On 08/15/19 06:02, Gao, Liming wrote:
> > > >> >> Donald: This change is a new feature. Now, it is not in edk2
> > > >> >> feature planning list. If you want to catch it into 201908
> > > >> >> stable tag, please get approve from Stewards first. I have cc
> > > >> >> this mail to all
> > > Stewards.
> > > >> > - I don't mind adding a new feature, as long as it gets
> > > >> > properly reviewed by package owners before we enter the soft
> feature freeze.
> > > >> >
> > > >> > - Looking at the BZ
> > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>, a bit
> > > >> > more documentation would be nice.
> > > >> >
> > > >> > - On the negative side, I'm very much *not* a fan of adding
> > > >> > features to the open source edk2 tree without actually
> > > >> > *consuming* the feature in an open source tree. Are the new
> > > >> > library instances going to be put to use in edk2-platforms, perhaps?
> > > >> >
> > > >> > We discussed this topic earlier on some of the stewards' calls.
> > > >> > On one hand, it's not uncommon to see library instances from
> > > >> > Intel enter core
> > > >> > edk2 packages without any dependent platform code, or even a
> > > >> > detailed problem statement / purpose description (see e.g.
> > > >> > commit 5c9bb86f171c and its surrounding commits). On the other
> > > >> > hand, attempts in the past, to add libraries with well
> > > >> > demonstrated and direct in-tree use cases, to
> > > >> > edk2 core, have been rejected, from other submitters. (Here's
> > > >> > one
> > > >> > example: <https://bugzilla.tianocore.org/show_bug.cgi?id=957>.)
> > > >> > I'm not prying at proprietary platform information, but a new
> > > >> > library added to
> > > >> > edk2 core *should* be well-justified.
> > > >> >
> > > >> > The commit message on this patch is empty. It only references
> > > >> > <https://bugzilla.tianocore.org/show_bug.cgi?id=1909>. And if I
> > > >> > open the BZ, this is all I get:
> > > >> >
> > > >> >     Need a new TSC library to check the CPUID leaf (EAX=0x15) for TSC.
> > > >> >     For new platform (start from SKL) can use CPUID and
> retire/remove
> > > >> >     the current override from AcpiTimerLib.
> > > >> >
> > > >> > Does this read like an actual feature request? (TimerLib is an
> > > >> > MdePkg library class, so not exactly "niche".)
> > > >>
> > > >> In comparison, the following email does read like a feature request:
> > > >>
> > > >> [edk2-devel] Determining TSC frequency programmatically
> > > >> https://edk2.groups.io/g/devel/message/45750
> > > >> http://mid.mail-archive.com/8EC14D0D-DFA5-412D-A4E1-
> > > >> 4D641576D58E@protonmail.com
> > > >>
> > > >> If the posting is related to TianoCore#1909, then I urge the BZ
> > > >> assignee to please reference the message in the TianoCore BZ.
> > > >>
> > > >> Thanks
> > > >> Laszlo
> > > >>
> > > >>