Changes in ctrlmondata.c

f4b369c6fe0ceaba2da2daff8c9eb415f85926dd - Merge branch 'next' into for-linus

Mon, 20 Apr 2026 03:28:57 +0200

Merge branch 'next' into for-linusPrepare input updates for 7.1 merge window. List of files: /linux/fs/resctrl/ctrlmondata.c

0421ccdfad0d92713a812a5aeb7d07b0ea7213c8 - Merge tag 'v7.0-rc3' into next

Thu, 12 Mar 2026 18:44:42 +0100

Merge tag 'v7.0-rc3' into nextSync up with the mainline to brig up the latest changes, specificallychanges to ALPS driver. List of files: /linux/fs/resctrl/ctrlmondata.c

fabd5a8d24fb5b430f71d3d3608696a7d5e9d720 - Merge tag 'x86_cache_for_v7.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Tue, 14 Apr 2026 23:46:37 +0200

Merge tag 'x86_cache_for_v7.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull x86 resource control updates from Borislav Petkov: - Add return value descriptions to several internal functions, addressing kernel-doc complaints - Add the x86 maintainer mailing list to the resctrl section so they are automatically included in patch submissions, and reference the applicable contribution rules document - Allow users to apply a single Capacity Bitmask to all cache domains at once using '*' as a shorthand, instead of having to specify each domain individually. This is particularly user-friendly on high core-count systems with many cache clusters - When a user provides a non-existent domain ID while configuring cache allocation, ensure the failure reason is properly reported to the user rather than silently returning an error with a misleading "ok" status* tag 'x86_cache_for_v7.1_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: fs/resctrl: Add missing return value descriptions MAINTAINERS: Update resctrl entry fs/resctrl: Add "*" shorthand to set io_alloc CBM for all domains fs/resctrl: Report invalid domain ID when parsing io_alloc_cbm List of files: /linux/fs/resctrl/ctrlmondata.c

d2bf45d067c728b0fe6e8f99a7386b8291e391e3 - fs/resctrl: Add "*" shorthand to set io_alloc CBM for all domains

Wed, 25 Mar 2026 01:11:59 +0100

fs/resctrl: Add "*" shorthand to set io_alloc CBM for all domainsConfiguring the io_alloc_cbm interface requires an explicit domain ID for eachcache domain. On systems with high core counts and numerous cache clusters,this requirement becomes cumbersome for automation and management tasks thataim to apply a uniform policy.Introduce a wildcard domain ID selector "*" for the io_alloc_cbm interface.This enables users to set the same Capacity Bitmask (CBM) across all cachedomains in a single operation.Signed-off-by: Aaron Tomlin Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Reviewed-by: Babu Moger Tested-by: Babu Moger Link: https://patch.msgid.link/20260325001159.447075-3-atomlin@atomlin.com List of files: /linux/fs/resctrl/ctrlmondata.c

d06b8e7c97c3290e61006e30b32beb9e715fab82 - fs/resctrl: Report invalid domain ID when parsing io_alloc_cbm

Wed, 25 Mar 2026 01:11:58 +0100

fs/resctrl: Report invalid domain ID when parsing io_alloc_cbmThe last_cmd_status file is intended to report details about the most recentresctrl filesystem operation, specifically to aid in diagnosing failures.However, when parsing io_alloc_cbm, if a user provides a domain ID that doesnot exist in the resource, the operation fails with -EINVAL without updatinglast_cmd_status. This results in inconsistent behaviour where the system callreturns an error, but last_cmd_status misleadingly reports "ok", leaving theuser unaware that the failure was caused by an invalid domain ID.Write an error message to last_cmd_status when the target domain ID cannotbe found.Fixes: 28fa2cce7a83 ("fs/resctrl: Introduce interface to modify io_alloc capacity bitmasks")Suggested-by: Reinette Chatre Signed-off-by: Aaron Tomlin Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Reviewed-by: Babu Moger Tested-by: Babu Moger Link: https://patch.msgid.link/20260325001159.447075-2-atomlin@atomlin.com List of files: /linux/fs/resctrl/ctrlmondata.c

42d3b66d4cdbacfc9d120d2301b8de89cc29a914 - Merge drm/drm-next into drm-xe-next

Thu, 12 Mar 2026 15:17:56 +0100

Merge drm/drm-next into drm-xe-nextBackmerging to bring in 7.00-rc3. Important ahead GPU SVM merging THPsupport.Signed-off-by: Matthew Brost List of files: /linux/fs/resctrl/ctrlmondata.c

f09812b85fa6f41058bcc46e70ac406bf9b0493a - Merge drm/drm-next into drm-intel-next

Wed, 25 Feb 2026 12:23:04 +0100

Merge drm/drm-next into drm-intel-nextSync with v7.0-rc1 which contains a few treewide changes affecting i915.Signed-off-by: Jani Nikula List of files: /linux/fs/resctrl/ctrlmondata.c

8b85987d3cf50178f67618122d9f3bb202f62f42 - Merge drm/drm-next into drm-misc-next

Mon, 23 Feb 2026 11:48:20 +0100

Merge drm/drm-next into drm-misc-nextLet's merge 7.0-rc1 to start the new drm-misc-next windowSigned-off-by: Maxime Ripard List of files: /linux/fs/resctrl/ctrlmondata.c

c17ee635fd3a482b2ad2bf5e269755c2eae5f25e - Merge drm/drm-fixes into drm-misc-fixes

Mon, 23 Feb 2026 10:09:45 +0100

Merge drm/drm-fixes into drm-misc-fixes7.0-rc1 was just released, let's merge it to kick the new release cycle.Signed-off-by: Maxime Ripard List of files: /linux/fs/resctrl/ctrlmondata.c

dcb49710189d104d4edc07709615748dab61341b - Merge tag 'x86_cache_for_v7.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Wed, 11 Feb 2026 03:24:56 +0100

Merge tag 'x86_cache_for_v7.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipPull x86 resource control updates from Borislav Petkov: - Extend the resctrl machinery to support telemetry monitoring on Intel (Tony Luck) The practical usage of this is being able to tell how much energy or how much work can be attributed to a group of tasks tracked under a single idenitifier. Prepend this work with proper refactoring of resctrl domains handling code.* tag 'x86_cache_for_v7.0_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits) x86,fs/resctrl: Update documentation for telemetry events x86/resctrl: Enable RDT_RESOURCE_PERF_PKG fs/resctrl: Move RMID initialization to first mount x86,fs/resctrl: Compute number of RMIDs as minimum across resources fs/resctrl: Move allocation/free of closid_num_dirty_rmid[] x86/resctrl: Handle number of RMIDs supported by RDT_RESOURCE_PERF_PKG x86/resctrl: Add energy/perf choices to rdt boot option x86,fs/resctrl: Handle domain creation/deletion for RDT_RESOURCE_PERF_PKG fs/resctrl: Refactor rmdir_mondata_subdir_allrdtgrp() fs/resctrl: Refactor mkdir_mondata_subdir() x86/resctrl: Read telemetry events x86/resctrl: Find and enable usable telemetry events x86,fs/resctrl: Add architectural event pointer x86,fs/resctrl: Fill in details of events for performance and energy GUIDs x86/resctrl: Discover hardware telemetry events fs/resctrl: Emphasize that L3 monitoring resource is required for summing domains x86,fs/resctrl: Add and initialize a resource for package scope monitoring x86,fs/resctrl: Add an architectural hook called for first mount x86,fs/resctrl: Support binary fixed point event counters x86,fs/resctrl: Handle events that can be read from any CPU ... List of files: /linux/fs/resctrl/ctrlmondata.c

cc4adab164b772a34b3340d644b7c4728498581e - Merge tag 'v6.19-rc1' into msm-next

Tue, 20 Jan 2026 23:06:55 +0100

Merge tag 'v6.19-rc1' into msm-nextMerge Linux 6.19-rc1 in order to catch up with other changes (e.g. UBWCconfig database defining UBWC_6).Signed-off-by: Dmitry Baryshkov List of files: /linux/fs/resctrl/ctrlmondata.c

db64994d115e7c2cd72fec11b854467e97169379 - fs/resctrl: Emphasize that L3 monitoring resource is required for summing domains

Wed, 17 Dec 2025 18:21:02 +0100

fs/resctrl: Emphasize that L3 monitoring resource is required for summing domainsThe feature to sum event data across multiple domains supports systems withSub-NUMA Cluster (SNC) mode enabled. The top-level monitoring files in each"mon_L3_XX" directory provide the sum of data across all SNC nodes sharing anL3 cache instance while the "mon_sub_L3_YY" sub-directories provide the eventdata of the individual nodes.SNC is only associated with the L3 resource and domains and as a result theflow handling the sum of event data implicitly assumes it is working withthe L3 resource and domains.Reading of telemetry events does not require to sum event data so this featurecan remain dedicated to SNC and keep the implicit assumption of working withthe L3 resource and domains.Add a WARN to where the implicit assumption of working with the L3 resourceis made and add comments on how the structure controlling the event sumfeature is used.Suggested-by: Reinette Chatre Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com List of files: /linux/fs/resctrl/ctrlmondata.c

e37c9a3dc9f9645532780d5ef34ea3b8fcf9ddef - x86,fs/resctrl: Support binary fixed point event counters

Wed, 17 Dec 2025 18:20:59 +0100

x86,fs/resctrl: Support binary fixed point event countersresctrl assumes that all monitor events can be displayed as unsigned decimalintegers.Hardware architecture counters may provide some telemetry events with greaterprecision where the event is not a simple count, but is a measurement of somesort (e.g. Joules for energy consumed).Add a new argument to resctrl_enable_mon_event() for architecture code toinform the file system that the value for a counter is a fixed-point valuewith a specific number of binary places.Only allow architecture to use floating point format on events that the filesystem has marked with mon_evt::is_floating_point which reflects the contractwith user space on how the event values are displayed.Display fixed point values with values rounded to ceil(binary_bits * log10(2))decimal places. Special case for zero binary bits to print "{value}.0".Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com List of files: /linux/fs/resctrl/ctrlmondata.c

ab0308aee3819a3eccde42f9eb5bb01d6733be38 - x86,fs/resctrl: Handle events that can be read from any CPU

Wed, 17 Dec 2025 18:20:58 +0100

x86,fs/resctrl: Handle events that can be read from any CPUresctrl assumes that monitor events can only be read from a CPU in thecpumask_t set of each domain. This is true for x86 events accessed with anMSR interface, but may not be true for other access methods such as MMIO.Introduce and use flag mon_evt::any_cpu, settable by architecture, thatindicates there are no restrictions on which CPU can read that event. Thisflag is not supported by the L3 event reading that requires to be run on a CPUthat belongs to the L3 domain of the event being read.Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com List of files: /linux/fs/resctrl/ctrlmondata.c

dd110880e80d35ad07e460e7a8da007c8058e7bf - fs/resctrl: Make event details accessible to functions when reading events

Wed, 17 Dec 2025 18:20:57 +0100

fs/resctrl: Make event details accessible to functions when reading eventsReading monitoring event data from MMIO requires more context than the event idto be able to read the correct memory location. struct mon_evt is the appropriateplace for this event specific context.Prepare for addition of extra fields to struct mon_evt by changing the callingconventions to pass a pointer to the mon_evt structure instead of just theevent id.Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com List of files: /linux/fs/resctrl/ctrlmondata.c

4bc3ef46ff41d5e7ba557e56e9cd2031527cd7f8 - x86,fs/resctrl: Rename struct rdt_mon_domain and rdt_hw_mon_domain

Wed, 17 Dec 2025 18:20:55 +0100

x86,fs/resctrl: Rename struct rdt_mon_domain and rdt_hw_mon_domainThe upcoming telemetry event monitoring is not tied to the L3 resource andwill have a new domain structure.Rename the L3 resource specific domain data structures to include "l3_"in their names to avoid confusion between the different resource specificdomain structures:rdt_mon_domain -> rdt_l3_mon_domainrdt_hw_mon_domain -> rdt_hw_l3_mon_domainNo functional change.Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com List of files: /linux/fs/resctrl/ctrlmondata.c

6b10cf7b6ea857cdf9570e21c077a05803f60575 - x86,fs/resctrl: Use struct rdt_domain_hdr when reading counters

Wed, 17 Dec 2025 18:20:54 +0100

x86,fs/resctrl: Use struct rdt_domain_hdr when reading countersConvert the whole call sequence from mon_event_read() to resctrl_arch_rmid_read() topass resource independent struct rdt_domain_hdr instead of an L3 specific domainstructure to prepare for monitoring events in other resources.This additional layer of indirection obscures which aspects of event counting dependon a valid domain. Event initialization, support for assignable counters, and normalevent counting implicitly depend on a valid domain while summing of domains does not.Split summing domains from the core event counting handling to make their respectivedependencies obvious.Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com List of files: /linux/fs/resctrl/ctrlmondata.c

97fec06d35b2c1ce6d80cf3b01bfddd82c720a2d - x86,fs/resctrl: Refactor domain create/remove using struct rdt_domain_hdr

Wed, 17 Dec 2025 18:20:52 +0100

x86,fs/resctrl: Refactor domain create/remove using struct rdt_domain_hdrUp until now, all monitoring events were associated with the L3 resource and itmade sense to use the L3 specific "struct rdt_mon_domain *" argument to functionsoperating on domains.Telemetry events will be tied to a new resource with its instances representedby a new domain structure that, just like struct rdt_mon_domain, starts withthe generic struct rdt_domain_hdr.Prepare to support domains belonging to different resources by changing thecalling convention of functions operating on domains. Pass the generic headerand use that to find the domain specific structure where needed.Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com List of files: /linux/fs/resctrl/ctrlmondata.c

03eb578b37659e10bed14c2d9e7cc45dfe24123b - x86,fs/resctrl: Improve domain type checking

Wed, 17 Dec 2025 18:20:48 +0100

x86,fs/resctrl: Improve domain type checkingEvery resctrl resource has a list of domain structures. struct rdt_ctrl_domainand struct rdt_mon_domain both begin with struct rdt_domain_hdr withrdt_domain_hdr::type used in validity checks before accessing the domain ofa particular type.Add the resource id to struct rdt_domain_hdr in preparation for a new monitoringdomain structure that will be associated with a new monitoring resource. Improveexisting domain validity checks with a new helper domain_header_is_valid()that checks both domain type and resource id. domain_header_is_valid() shouldbe used before every call to container_of() that accesses a domain structure.Signed-off-by: Tony Luck Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Reinette Chatre Link: https://lore.kernel.org/20251217172121.12030-1-tony.luck@intel.com List of files: /linux/fs/resctrl/ctrlmondata.c

5add3c3c280a35f7e258e9cef7607db5a2e56fdc - Merge drm/drm-next into drm-xe-next

Fri, 19 Dec 2025 11:51:22 +0100

Merge drm/drm-next into drm-xe-nextBackmerging to bring in 6.19-rc1. An important upstream bugfix andto help unblock PTL CI.Signed-off-by: Thomas Hellström List of files: /linux/fs/resctrl/ctrlmondata.c