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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Oct 2022 20:28:38.1849 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c84d4f8c-3ce8-4b85-9fa2-08daaafe0370 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT105.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7022 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org New AMD processors can now support following QoS features.=0A= =0A= 1. Slow Memory Bandwidth Allocation (SMBA)=0A= With this feature, the QOS enforcement policies can be applied=0A= to the external slow memory connected to the host. QOS enforcement=0A= is accomplished by assigning a Class Of Service (COS) to a processor=0A= and specifying allocations or limits for that COS for each resource=0A= to be allocated.=0A= =0A= Currently, CXL.memory is the only supported "slow" memory device. With= =0A= the support of SMBA feature the hardware enables bandwidth allocation=0A= on the slow memory devices.=0A= =0A= 2. Bandwidth Monitoring Event Configuration (BMEC)=0A= The bandwidth monitoring events mbm_total_event and mbm_local_event =0A= are set to count all the total and local reads/writes respectively.=0A= With the introduction of slow memory, the two counters are not enough=0A= to count all the different types are memory events. With the feature=0A= BMEC, the users have the option to configure mbm_total_event and=0A= mbm_local_event to count the specific type of events.=0A= =0A= Following are the bitmaps of events supported.=0A= Bits Description=0A= 6 Dirty Victims from the QOS domain to all types of memory=0A= 5 Reads to slow memory in the non-local NUMA domain=0A= 4 Reads to slow memory in the local NUMA domain=0A= 3 Non-temporal writes to non-local NUMA domain=0A= 2 Non-temporal writes to local NUMA domain=0A= 1 Reads to memory in the non-local NUMA domain=0A= 0 Reads to memory in the local NUMA domain=0A= =0A= This series adds support for these features.=0A= =0A= Feature description is available in the specification, "AMD64 Technology=0A= Platform Quality of Service Extensions, Revision: 1.03 Publication # 56375= =0A= Revision: 1.03 Issue Date: February 2022".=0A= =0A= Link: https://www.amd.com/en/support/tech-docs/amd64-technology-platform-qu= ality-service-extensions=0A= Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D206537=0A= ---=0A= v6:=0A= Summary of changes:=0A= 1. Rebased on top of lastest tip tree. Fixed few minor conflicts.=0A= 2. Fixed format issue with scattered.c.=0A= 3. Removed config_name from the structure mon_evt. It is not required.=0A= 4. The read/write format for mbm_total_config and mbm_local_config will be= same=0A= as schemata format "id0=3Dval0;id1=3Dval1;...". This is comment from Fe= nghua.=0A= 5. Added more comments MSR_IA32_EVT_CFG_BASE writng.=0A= 5. Few text changes in resctrl.rst =0A= =0A= v5:=0A= https://lore.kernel.org/lkml/166431016617.373387.1968875281081252467.stgi= t@bmoger-ubuntu/=0A= Summary of changes.=0A= 1. Split the series into two. The first two patches are bug fixes. So, se= nt them separate.=0A= 2. The config files mbm_total_config and mbm_local_config are now under= =0A= /sys/fs/resctrl/info/L3_MON/. Removed these config files from mon grou= ps.=0A= 3. Ran "checkpatch --strict --codespell" on all the patches. Looks good w= ith few known exceptions.=0A= 4. Few minor text changes in resctrl.rst file. =0A= =0A= v4:=0A= https://lore.kernel.org/lkml/166257348081.1043018.11227924488792315932.st= git@bmoger-ubuntu/=0A= Got numerios of comments from Reinette Chatre. Addressed most of them. = =0A= Summary of changes.=0A= 1. Removed mon_configurable under /sys/fs/resctrl/info/L3_MON/. =0A= 2. Updated mon_features texts if the BMEC is supported.=0A= 3. Added more explanation about the slow memory support.=0A= 4. Replaced smp_call_function_many with on_each_cpu_mask call.=0A= 5. Removed arch_has_empty_bitmaps=0A= 6. Few other text changes.=0A= 7. Removed Reviewed-by if the patch is modified.=0A= 8. Rebased the patches to latest tip.=0A= =0A= v3:=0A= https://lore.kernel.org/lkml/166117559756.6695.16047463526634290701.stgit= @bmoger-ubuntu/=0A= a. Rebased the patches to latest tip. Resolved some conflicts.=0A= https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git=0A= b. Taken care of feedback from Bagas Sanjaya.=0A= c. Added Reviewed by from Mingo.=0A= Note: I am still looking for comments from Reinette or Fenghua.=0A= =0A= v2:=0A= https://lore.kernel.org/lkml/165938717220.724959.10931629283087443782.stg= it@bmoger-ubuntu/=0A= a. Rebased the patches to latest stable tree (v5.18.15). Resolved some co= nflicts.=0A= b. Added the patch to fix CBM issue on AMD. This was originally discussed= =0A= https://lore.kernel.org/lkml/20220517001234.3137157-1-eranian@google.c= om/=0A= =0A= v1:=0A= https://lore.kernel.org/lkml/165757543252.416408.13547339307237713464.stg= it@bmoger-ubuntu/=0A= =0A= Babu Moger (12):=0A= x86/cpufeatures: Add Slow Memory Bandwidth Allocation feature flag=0A= x86/resctrl: Add a new resource type RDT_RESOURCE_SMBA=0A= x86/cpufeatures: Add Bandwidth Monitoring Event Configuration feature= flag=0A= x86/resctrl: Include new features in command line options=0A= x86/resctrl: Detect and configure Slow Memory Bandwidth allocation=0A= x86/resctrl: Introduce data structure to support monitor configuratio= n=0A= x86/resctrl: Add sysfs interface to read mbm_total_bytes event config= uration=0A= x86/resctrl: Add sysfs interface to read mbm_local_bytes event config= uration=0A= x86/resctrl: Add sysfs interface to write mbm_total_bytes event confi= guration=0A= x86/resctrl: Add sysfs interface to write mbm_local_bytes event confi= guration=0A= x86/resctrl: Replace smp_call_function_many() with on_each_cpu_mask()= =0A= Documentation/x86: Update resctrl_ui.rst for new features=0A= =0A= =0A= .../admin-guide/kernel-parameters.txt | 2 +-=0A= Documentation/x86/resctrl.rst | 136 +++++++-=0A= arch/x86/include/asm/cpufeatures.h | 2 +=0A= arch/x86/kernel/cpu/cpuid-deps.c | 1 +=0A= arch/x86/kernel/cpu/resctrl/core.c | 51 ++-=0A= arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 2 +-=0A= arch/x86/kernel/cpu/resctrl/internal.h | 31 +-=0A= arch/x86/kernel/cpu/resctrl/monitor.c | 7 +-=0A= arch/x86/kernel/cpu/resctrl/rdtgroup.c | 313 ++++++++++++++++--=0A= arch/x86/kernel/cpu/scattered.c | 2 +=0A= 10 files changed, 510 insertions(+), 37 deletions(-)=0A= =0A= --=0A=