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From:   "Moger, Babu" <Babu.Moger@amd.com>
To:     Bagas Sanjaya <bagasdotme@gmail.com>,
        "corbet@lwn.net" <corbet@lwn.net>,
        "reinette.chatre@intel.com" <reinette.chatre@intel.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "mingo@redhat.com" <mingo@redhat.com>,
        "bp@alien8.de" <bp@alien8.de>
CC:     "fenghua.yu@intel.com" <fenghua.yu@intel.com>,
        "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
        "x86@kernel.org" <x86@kernel.org>, "hpa@zytor.com" <hpa@zytor.com>,
        "paulmck@kernel.org" <paulmck@kernel.org>,
        "akpm@linux-foundation.org" <akpm@linux-foundation.org>,
        "quic_neeraju@quicinc.com" <quic_neeraju@quicinc.com>,
        "rdunlap@infradead.org" <rdunlap@infradead.org>,
        "damien.lemoal@opensource.wdc.com" <damien.lemoal@opensource.wdc.com>,
        "songmuchun@bytedance.com" <songmuchun@bytedance.com>,
        "peterz@infradead.org" <peterz@infradead.org>,
        "jpoimboe@kernel.org" <jpoimboe@kernel.org>,
        "pbonzini@redhat.com" <pbonzini@redhat.com>,
        "chang.seok.bae@intel.com" <chang.seok.bae@intel.com>,
        "pawan.kumar.gupta@linux.intel.com" 
        <pawan.kumar.gupta@linux.intel.com>,
        "jmattson@google.com" <jmattson@google.com>,
        "daniel.sneddon@linux.intel.com" <daniel.sneddon@linux.intel.com>,
        "Das1, Sandipan" <Sandipan.Das@amd.com>,
        "tony.luck@intel.com" <tony.luck@intel.com>,
        "james.morse@arm.com" <james.morse@arm.com>,
        "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "eranian@google.com" <eranian@google.com>
Subject: RE: [PATCH v5 00/12] x86/resctrl: Support for AMD QoS new features
Thread-Topic: [PATCH v5 00/12] x86/resctrl: Support for AMD QoS new features
Thread-Index: AQHY0q9KrUGGvTk3FkG5TCKLSx8ls64CqZCAgAB6VpA=
Date:   Fri, 7 Oct 2022 15:51:57 +0000
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References: <166431016617.373387.1968875281081252467.stgit@bmoger-ubuntu>
 <eb7e7927-84b4-a952-e8c7-dec518bfcda9@gmail.com>
In-Reply-To: <eb7e7927-84b4-a952-e8c7-dec518bfcda9@gmail.com>
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[AMD Official Use Only - General]

Hi Sanjaya,

> -----Original Message-----
> From: Bagas Sanjaya <bagasdotme@gmail.com>
> Sent: Friday, October 7, 2022 3:33 AM
> To: Moger, Babu <Babu.Moger@amd.com>; corbet@lwn.net;
> reinette.chatre@intel.com; tglx@linutronix.de; mingo@redhat.com;
> bp@alien8.de
> Cc: fenghua.yu@intel.com; dave.hansen@linux.intel.com; x86@kernel.org;
> hpa@zytor.com; paulmck@kernel.org; akpm@linux-foundation.org;
> quic_neeraju@quicinc.com; rdunlap@infradead.org;
> damien.lemoal@opensource.wdc.com; songmuchun@bytedance.com;
> peterz@infradead.org; jpoimboe@kernel.org; pbonzini@redhat.com;
> chang.seok.bae@intel.com; pawan.kumar.gupta@linux.intel.com;
> jmattson@google.com; daniel.sneddon@linux.intel.com; Das1, Sandipan
> <Sandipan.Das@amd.com>; tony.luck@intel.com; james.morse@arm.com;
> linux-doc@vger.kernel.org; linux-kernel@vger.kernel.org;
> eranian@google.com
> Subject: Re: [PATCH v5 00/12] x86/resctrl: Support for AMD QoS new featur=
es
>=20
> On 9/28/22 03:25, Babu Moger wrote:
> > New AMD processors can now support following QoS features.
> >
> > 1. Slow Memory Bandwidth Allocation (SMBA)
> >    With this feature, the QOS enforcement policies can be applied
> >    to the external slow memory connected to the host. QOS enforcement
> >    is accomplished by assigning a Class Of Service (COS) to a processor
> >    and specifying allocations or limits for that COS for each resource
> >    to be allocated.
> >
> >    Currently, CXL.memory is the only supported "slow" memory device. Wi=
th
> >    the support of SMBA feature the hardware enables bandwidth allocatio=
n
> >    on the slow memory devices.
> >
> > 2. Bandwidth Monitoring Event Configuration (BMEC)
> >    The bandwidth monitoring events mbm_total_event and mbm_local_event
> >    are set to count all the total and local reads/writes respectively.
> >    With the introduction of slow memory, the two counters are not enoug=
h
> >    to count all the different types are memory events. With the feature
> >    BMEC, the users have the option to configure mbm_total_event and
> >    mbm_local_event to count the specific type of events.
> >
> >    Following are the bitmaps of events supported.
> >    Bits    Description
> >      6       Dirty Victims from the QOS domain to all types of memory
> >      5       Reads to slow memory in the non-local NUMA domain
> >      4       Reads to slow memory in the local NUMA domain
> >      3       Non-temporal writes to non-local NUMA domain
> >      2       Non-temporal writes to local NUMA domain
> >      1       Reads to memory in the non-local NUMA domain
> >      0       Reads to memory in the local NUMA domain
> >
> > This series adds support for these features.
> >
> > Feature description is available in the specification, "AMD64
> > Technology Platform Quality of Service Extensions, Revision: 1.03 Publi=
cation
> # 56375 Revision: 1.03 Issue Date: February 2022".
> >
> > Link:
> > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww=
.
> > amd.com%2Fen%2Fsupport%2Ftech-docs%2Famd64-technology-platform-
> quality
> > -service-
> extensions&amp;data=3D05%7C01%7Cbabu.moger%40amd.com%7Cda5fc806
> >
> 9ca2484b2aef08daa83ea08a%7C3dd8961fe4884e608e11a82d994e183d%7C0%
> 7C0%7C
> >
> 638007284215759374%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD
> AiLCJQIjo
> >
> iV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdat
> a=3DqAZS
> > ze2Mbg24Z0%2BX0GN4yrVO2ooQqQyum7NUjwIGg5o%3D&amp;reserved=3D0
> > Link:
> > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fbug=
z
> >
> illa.kernel.org%2Fshow_bug.cgi%3Fid%3D206537&amp;data=3D05%7C01%7Cbab
> u.m
> >
> oger%40amd.com%7Cda5fc8069ca2484b2aef08daa83ea08a%7C3dd8961fe488
> 4e608e
> >
> 11a82d994e183d%7C0%7C0%7C638007284215759374%7CUnknown%7CTWFpb
> GZsb3d8ey
> >
> JWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7
> C300
> >
> 0%7C%7C%7C&amp;sdata=3D8%2BFbGTVfkp%2BCbyyk%2BYa9u0JiHi2YZEVaHiUs
> CBw335g
> > %3D&amp;reserved=3D0
> >
> > ---
> > v5:
> >   Summary of changes.
> >   1. Split the series into two. The first two patches are bug fixes. So=
, sent them
> separate.
> >   2. The config files mbm_total_config and mbm_local_config are now und=
er
> >      /sys/fs/resctrl/info/L3_MON/. Removed these config files from mon
> groups.
> >   3. Ran "checkpatch --strict --codespell" on all the patches. Looks go=
od with
> few known exceptions.
> >   4. Few minor text changes in resctrl.rst file.
> >
> > v4:
> >
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flore.=
kern
> el.org%2Flkml%2F166257348081.1043018.11227924488792315932.stgit%40bm
> oger-
> ubuntu%2F&amp;data=3D05%7C01%7Cbabu.moger%40amd.com%7Cda5fc8069ca
> 2484b2aef08daa83ea08a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0
> %7C638007284215759374%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw
> MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7
> C&amp;sdata=3DqamR1M2sVSo4vE9NVZzFmvIop7YMKNIYHT74NJrbVVk%3D&am
> p;reserved=3D0
> >   Got numerios of comments from Reinette Chatre. Addressed most of them=
.
> >   Summary of changes.
> >   1. Removed mon_configurable under /sys/fs/resctrl/info/L3_MON/.
> >   2. Updated mon_features texts if the BMEC is supported.
> >   3. Added more explanation about the slow memory support.
> >   4. Replaced smp_call_function_many with on_each_cpu_mask call.
> >   5. Removed arch_has_empty_bitmaps
> >   6. Few other text changes.
> >   7. Removed Reviewed-by if the patch is modified.
> >   8. Rebased the patches to latest tip.
> >
> > v3:
> >
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flore.=
kern
> el.org%2Flkml%2F166117559756.6695.16047463526634290701.stgit%40bmoge
> r-
> ubuntu%2F&amp;data=3D05%7C01%7Cbabu.moger%40amd.com%7Cda5fc8069ca
> 2484b2aef08daa83ea08a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0
> %7C638007284215915604%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw
> MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7
> C&amp;sdata=3DogINZslT9yExkkFww4X14XQEg8W8heYBrJB59C50Hqk%3D&amp;
> reserved=3D0
> >   a. Rebased the patches to latest tip. Resolved some conflicts.
> >
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fgit.k=
erne
> l.org%2Fpub%2Fscm%2Flinux%2Fkernel%2Fgit%2Ftip%2Ftip.git&amp;data=3D05%
> 7C01%7Cbabu.moger%40amd.com%7Cda5fc8069ca2484b2aef08daa83ea08a%
> 7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C638007284215915604
> %7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJ
> BTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=3DZOK3iwsaq
> 3%2BGAUIXJwn9Thg3cJBxWDMAfu4UqHlo2J4%3D&amp;reserved=3D0
> >   b. Taken care of feedback from Bagas Sanjaya.
> >   c. Added Reviewed by from Mingo.
> >   Note: I am still looking for comments from Reinette or Fenghua.
> >
> > v2:
> >
> https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flore.=
kern
> el.org%2Flkml%2F165938717220.724959.10931629283087443782.stgit%40bmo
> ger-
> ubuntu%2F&amp;data=3D05%7C01%7Cbabu.moger%40amd.com%7Cda5fc8069ca
> 2484b2aef08daa83ea08a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0
> %7C638007284215915604%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAw
> MDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7
> C&amp;sdata=3D14viyG9elsn6BYGpDOwrqYQFNOlpyC6oqoJwJm49oV0%3D&amp;
> reserved=3D0
> >   a. Rebased the patches to latest stable tree (v5.18.15). Resolved som=
e
> conflicts.
> >   b. Added the patch to fix CBM issue on AMD. This was originally discu=
ssed
> >
> > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flor=
e
> > .kernel.org%2Flkml%2F20220517001234.3137157-1-
> eranian%40google.com%2F&
> >
> amp;data=3D05%7C01%7Cbabu.moger%40amd.com%7Cda5fc8069ca2484b2aef0
> 8daa83e
> >
> a08a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C6380072842159
> 15604%7
> >
> CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI
> 6Ik1
> >
> haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=3D%2BHEvN2PNNYyH
> ohvLg2sbth
> > BQo4cgDj5Vsw9AqGb1Pr8%3D&amp;reserved=3D0
> >
> > v1:
> >
> > https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Flor=
e
> >
> .kernel.org%2Flkml%2F165757543252.416408.13547339307237713464.stgit%4
> 0
> > bmoger-
> ubuntu%2F&amp;data=3D05%7C01%7Cbabu.moger%40amd.com%7Cda5fc8069ca
> >
> 2484b2aef08daa83ea08a%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0
> %7C638
> >
> 007284215915604%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLC
> JQIjoiV2
> >
> luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&amp;sdata=3DJ
> R03cAA
> > 9pzmq0SgNsgAsajOH6LX%2F4s3px3b%2FJ8409Ys%3D&amp;reserved=3D0
> >
> > Babu Moger (12):
> >       x86/cpufeatures: Add Slow Memory Bandwidth Allocation feature fla=
g
> >       x86/resctrl: Add a new resource type RDT_RESOURCE_SMBA
> >       x86/cpufeatures: Add Bandwidth Monitoring Event Configuration fea=
ture
> flag
> >       x86/resctrl: Include new features in command line options
> >       x86/resctrl: Detect and configure Slow Memory Bandwidth allocatio=
n
> >       x86/resctrl: Introduce data structure to support monitor configur=
ation
> >       x86/resctrl: Add sysfs interface to read mbm_total_bytes event
> configuration
> >       x86/resctrl: Add sysfs interface to read mbm_local_bytes event
> configuration
> >       x86/resctrl: Add sysfs interface to write mbm_total_bytes event
> configuration
> >       x86/resctrl: Add sysfs interface to write mbm_local_bytes event
> configuration
> >       x86/resctrl: Replace smp_call_function_many() with on_each_cpu_ma=
sk()
> >       Documentation/x86: Update resctrl_ui.rst for new features
> >
> >
> >  .../admin-guide/kernel-parameters.txt         |   2 +-
> >  Documentation/x86/resctrl.rst                 | 130 +++++++-
> >  arch/x86/include/asm/cpufeatures.h            |   2 +
> >  arch/x86/kernel/cpu/cpuid-deps.c              |   1 +
> >  arch/x86/kernel/cpu/resctrl/core.c            |  51 ++-
> >  arch/x86/kernel/cpu/resctrl/ctrlmondata.c     |   2 +-
> >  arch/x86/kernel/cpu/resctrl/internal.h        |  33 +-
> >  arch/x86/kernel/cpu/resctrl/monitor.c         |   9 +-
> >  arch/x86/kernel/cpu/resctrl/rdtgroup.c        | 298 ++++++++++++++++--
> >  arch/x86/kernel/cpu/scattered.c               |   2 +
> >  10 files changed, 496 insertions(+), 34 deletions(-)
> >
>=20
> Hi Babu, sorry for having to do public reply to this v5 cover letter due =
to
> accidentally delete the preview documentation patch for your upcoming v6.
>=20
> Thanks for privately sending me the preview patch. Seeing it at a glance,
> LGTM. Please send the full v6 series for us to review.
Sure. Will send the whole series.
Thanks
Babu