- Implement per-PMU context rescheduling to significantly improve single-PMU
performance, and related cleanups/fixes. (by Peter Zijlstra and Namhyung Kim)
- Fix ancient bug resulting in a lot of events being dropped erroneously
at higher sampling frequencies. (by Luo Gengkun)
- uprobes enhancements:
- Implement RCU-protected hot path optimizations for better performance:
"For baseline vs SRCU, peak througput increased from 3.7 M/s (million uprobe
triggerings per second) up to about 8 M/s. For uretprobes it's a bit more
modest with bump from 2.4 M/s to 5 M/s.
For SRCU vs RCU Tasks Trace, peak throughput for uprobes increases further from
8 M/s to 10.3 M/s (+28%!), and for uretprobes from 5.3 M/s to 5.8 M/s (+11%),
as we have more work to do on uretprobes side.
Even single-thread (no contention) performance is slightly better: 3.276 M/s to
3.396 M/s (+3.5%) for uprobes, and 2.055 M/s to 2.174 M/s (+5.8%)
for uretprobes."
(by Andrii Nakryiko et al)
- Document mmap_lock, don't abuse get_user_pages_remote(). (by Oleg Nesterov)
- Cleanups & fixes to prepare for future work:
- Remove uprobe_register_refctr()
- Simplify error handling for alloc_uprobe()
- Make uprobe_register() return struct uprobe *
- Fold __uprobe_unregister() into uprobe_unregister()
- Shift put_uprobe() from delete_uprobe() to uprobe_unregister()
- BPF: Fix use-after-free in bpf_uprobe_multi_link_attach()
(by Oleg Nesterov)
- New feature & ABI extension: allow events to use PERF_SAMPLE READ with
inheritance, enabling sample based profiling of a group of counters over
a hierarchy of processes or threads. (by Ben Gainey)
- Intel uncore & power events updates:
- Add Arrow Lake and Lunar Lake support
- Add PERF_EV_CAP_READ_SCOPE
- Clean up and enhance cpumask and hotplug support
(by Kan Liang)
- Add LNL uncore iMC freerunning support
- Use D0:F0 as a default device
(by Zhenyu Wang)
- Intel PT: fix AUX snapshot handling race. (by Adrian Hunter)
- Misc fixes and cleanups. (by James Clark, Jiri Olsa, Oleg Nesterov and Peter Zijlstra)
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-core-2024-09-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf events updates from Ingo Molnar:
- Implement per-PMU context rescheduling to significantly improve
single-PMU performance, and related cleanups/fixes (Peter Zijlstra
and Namhyung Kim)
- Fix ancient bug resulting in a lot of events being dropped
erroneously at higher sampling frequencies (Luo Gengkun)
- uprobes enhancements:
- Implement RCU-protected hot path optimizations for better
performance:
"For baseline vs SRCU, peak througput increased from 3.7 M/s
(million uprobe triggerings per second) up to about 8 M/s. For
uretprobes it's a bit more modest with bump from 2.4 M/s to
5 M/s.
For SRCU vs RCU Tasks Trace, peak throughput for uprobes
increases further from 8 M/s to 10.3 M/s (+28%!), and for
uretprobes from 5.3 M/s to 5.8 M/s (+11%), as we have more
work to do on uretprobes side.
Even single-thread (no contention) performance is slightly
better: 3.276 M/s to 3.396 M/s (+3.5%) for uprobes, and 2.055
M/s to 2.174 M/s (+5.8%) for uretprobes."
(Andrii Nakryiko et al)
- Document mmap_lock, don't abuse get_user_pages_remote() (Oleg
Nesterov)
- Cleanups & fixes to prepare for future work:
- Remove uprobe_register_refctr()
- Simplify error handling for alloc_uprobe()
- Make uprobe_register() return struct uprobe *
- Fold __uprobe_unregister() into uprobe_unregister()
- Shift put_uprobe() from delete_uprobe() to uprobe_unregister()
- BPF: Fix use-after-free in bpf_uprobe_multi_link_attach()
(Oleg Nesterov)
- New feature & ABI extension: allow events to use PERF_SAMPLE READ
with inheritance, enabling sample based profiling of a group of
counters over a hierarchy of processes or threads (Ben Gainey)
- Intel uncore & power events updates:
- Add Arrow Lake and Lunar Lake support
- Add PERF_EV_CAP_READ_SCOPE
- Clean up and enhance cpumask and hotplug support
(Kan Liang)
- Add LNL uncore iMC freerunning support
- Use D0:F0 as a default device
(Zhenyu Wang)
- Intel PT: fix AUX snapshot handling race (Adrian Hunter)
- Misc fixes and cleanups (James Clark, Jiri Olsa, Oleg Nesterov and
Peter Zijlstra)
* tag 'perf-core-2024-09-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (40 commits)
dmaengine: idxd: Clean up cpumask and hotplug for perfmon
iommu/vt-d: Clean up cpumask and hotplug for perfmon
perf/x86/intel/cstate: Clean up cpumask and hotplug
perf: Add PERF_EV_CAP_READ_SCOPE
perf: Generic hotplug support for a PMU with a scope
uprobes: perform lockless SRCU-protected uprobes_tree lookup
rbtree: provide rb_find_rcu() / rb_find_add_rcu()
perf/uprobe: split uprobe_unregister()
uprobes: travers uprobe's consumer list locklessly under SRCU protection
uprobes: get rid of enum uprobe_filter_ctx in uprobe filter callbacks
uprobes: protected uprobe lifetime with SRCU
uprobes: revamp uprobe refcounting and lifetime management
bpf: Fix use-after-free in bpf_uprobe_multi_link_attach()
perf/core: Fix small negative period being ignored
perf: Really fix event_function_call() locking
perf: Optimize __pmu_ctx_sched_out()
perf: Add context time freeze
perf: Fix event_function_call() locking
perf: Extract a few helpers
perf: Optimize context reschedule for single PMU cases
...
The BPF subsystem may capture LBR data on a counting event. However, the
current implementation assumes that LBR can/should only be used with
sampling events.
For instance, retsnoop tool ([0]) makes an extensive use of this
functionality and sets up perf event as follows:
struct perf_event_attr attr;
memset(&attr, 0, sizeof(attr));
attr.size = sizeof(attr);
attr.type = PERF_TYPE_HARDWARE;
attr.config = PERF_COUNT_HW_CPU_CYCLES;
attr.sample_type = PERF_SAMPLE_BRANCH_STACK;
attr.branch_sample_type = PERF_SAMPLE_BRANCH_KERNEL;
To limit the LBR for a sampling event is to avoid unnecessary branch
stack setup for a counting event in the sample read. Because LBR is only
read in the sampling event's overflow.
Although in most cases LBR is used in sampling, there is no HW limit to
bind LBR to the sampling mode. Allow an LBR setup for a counting event
unless in the sample read mode.
Fixes: 85846b2707 ("perf/x86: Add PERF_X86_EVENT_NEEDS_BRANCH_STACK flag")
Closes: https://lore.kernel.org/lkml/20240905180055.1221620-1-andrii@kernel.org/
Reported-by: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Tested-by: Andrii Nakryiko <andrii@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240909155848.326640-1-kan.liang@linux.intel.com
There are three cstate PMUs with different scopes, core, die and module.
The scopes are supported by the generic perf_event subsystem now.
Set the scope for each PMU and remove all the cpumask and hotplug codes.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240802151643.1691631-4-kan.liang@linux.intel.com
Running the ltp test cve-2015-3290 concurrently reports the following
warnings.
perfevents: irq loop stuck!
WARNING: CPU: 31 PID: 32438 at arch/x86/events/intel/core.c:3174
intel_pmu_handle_irq+0x285/0x370
Call Trace:
<NMI>
? __warn+0xa4/0x220
? intel_pmu_handle_irq+0x285/0x370
? __report_bug+0x123/0x130
? intel_pmu_handle_irq+0x285/0x370
? __report_bug+0x123/0x130
? intel_pmu_handle_irq+0x285/0x370
? report_bug+0x3e/0xa0
? handle_bug+0x3c/0x70
? exc_invalid_op+0x18/0x50
? asm_exc_invalid_op+0x1a/0x20
? irq_work_claim+0x1e/0x40
? intel_pmu_handle_irq+0x285/0x370
perf_event_nmi_handler+0x3d/0x60
nmi_handle+0x104/0x330
Thanks to Thomas Gleixner's analysis, the issue is caused by the low
initial period (1) of the frequency estimation algorithm, which triggers
the defects of the HW, specifically erratum HSW11 and HSW143. (For the
details, please refer https://lore.kernel.org/lkml/87plq9l5d2.ffs@tglx/)
The HSW11 requires a period larger than 100 for the INST_RETIRED.ALL
event, but the initial period in the freq mode is 1. The erratum is the
same as the BDM11, which has been supported in the kernel. A minimum
period of 128 is enforced as well on HSW.
HSW143 is regarding that the fixed counter 1 may overcount 32 with the
Hyper-Threading is enabled. However, based on the test, the hardware
has more issues than it tells. Besides the fixed counter 1, the message
'interrupt took too long' can be observed on any counter which was armed
with a period < 32 and two events expired in the same NMI. A minimum
period of 32 is enforced for the rest of the events.
The recommended workaround code of the HSW143 is not implemented.
Because it only addresses the issue for the fixed counter. It brings
extra overhead through extra MSR writing. No related overcounting issue
has been reported so far.
Fixes: 3a632cb229 ("perf/x86/intel: Add simple Haswell PMU support")
Reported-by: Li Huafei <lihuafei1@huawei.com>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/all/20240819183004.3132920-1-kan.liang@linux.intel.com
Closes: https://lore.kernel.org/lkml/20240729223328.327835-1-lihuafei1@huawei.com/
The default paranoid setting was updated in commit 0161028b7c
("perf/core: Change the default paranoia level to 2") so this comment is
no longer true.
Signed-off-by: James Clark <james.clark@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20240802105256.335961-1-james.clark@linaro.org
Some uncore PMON registers are located in the MMIO space of the Host
Bridge and DRAM Controller device, which is located at D0:F0 for
Tiger Lake and later client generation.
Use D0:F0 as a default device. So it doesn't need to keep adding the
complete Device ID list for each generation anymore.
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Link: https://lore.kernel.org/r/20240731141353.759643-5-kan.liang@linux.intel.com
LNL uncore imc freerunning counters keep same as previous HW.
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Link: https://lore.kernel.org/r/20240731141353.759643-4-kan.liang@linux.intel.com
The uncore subsystem for Lunar Lake is similar to the previous
Meteor Lake. The uncore PerfMon registers are located at both
MSR and MMIO space.
The ARB and iMC are kept. There is no difference from the Meteor Lake.
Move the global control initialization to the first box of the CBOX.
The sNCU is moved to the MMIO space.
The HBO is newly added and only be accessed from the MMIO space.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240731141353.759643-3-kan.liang@linux.intel.com
Some uncore PMON registers are located in the MMIO space. For the client
machine, the MMIO space is usually located at D0:F0 but in a different
BAR. For example, some uncore PMON registers are located in the SAF BAR,
not the MCHBAR in the Lunar Lake.
The current __uncore_imc_init_box() hard code the BAR information.
Factor out the uncore_get_box_mmio_addr() which uses the BAR information
as a parameter.
The only change is the error output message. The hardcode name 'MCHBAR'
is replaced by the offset of a BAR.
Add a new macro, MMIO_UNCORE_COMMON_OPS(), since the MMIO ops functions
are usually the same among different generations.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240731141353.759643-2-kan.liang@linux.intel.com
>From the perspective of the uncore PMU, the Arrow Lake is the same as
the previous Meteor Lake. The only difference is the event list, which
will be supported in the perf tool later.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240731141353.759643-1-kan.liang@linux.intel.com
pt_event_snapshot_aux() uses pt->handle_nmi to determine if tracing
needs to be stopped, however tracing can still be going because
pt->handle_nmi is set to zero before tracing is stopped in pt_event_stop,
whereas pt_event_snapshot_aux() requires that tracing must be stopped in
order to copy a sample of trace from the buffer.
Instead call pt_config_stop() always, which anyway checks config for
RTIT_CTL_TRACEEN and does nothing if it is already clear.
Note pt_event_snapshot_aux() can continue to use pt->handle_nmi to
determine if the trace needs to be restarted afterwards.
Fixes: 25e8920b30 ("perf/x86/intel/pt: Add sampling support")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20240715160712.127117-2-adrian.hunter@intel.com
Package C2 residency counter is also available on Sierra Forest.
So add it support in srf_cstates.
Fixes: 3877d55a0d ("perf/x86/intel/cstate: Add Sierra Forest support")
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Tested-by: Wendy Wang <wendy.wang@intel.com>
Link: https://lore.kernel.org/r/20240717031609.74513-1-zhenyuw@linux.intel.com
- Intel PT support enhancements & fixes
- Fix leaked SIGTRAP events
- Improve and fix the Intel uncore driver
- Add support for Intel HBM and CXL uncore counters
- Add Intel Lake and Arrow Lake support
- AMD uncore driver fixes
- Make SIGTRAP and __perf_pending_irq() work on RT
- Micro-optimizations
- Misc cleanups and fixes
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'perf-core-2024-07-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull performance events updates from Ingo Molnar:
- Intel PT support enhancements & fixes
- Fix leaked SIGTRAP events
- Improve and fix the Intel uncore driver
- Add support for Intel HBM and CXL uncore counters
- Add Intel Lake and Arrow Lake support
- AMD uncore driver fixes
- Make SIGTRAP and __perf_pending_irq() work on RT
- Micro-optimizations
- Misc cleanups and fixes
* tag 'perf-core-2024-07-16' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (44 commits)
perf/x86/intel: Add a distinct name for Granite Rapids
perf/x86/intel/ds: Fix non 0 retire latency on Raptorlake
perf/x86/intel: Hide Topdown metrics events if the feature is not enumerated
perf/x86/intel/uncore: Fix the bits of the CHA extended umask for SPR
perf: Split __perf_pending_irq() out of perf_pending_irq()
perf: Don't disable preemption in perf_pending_task().
perf: Move swevent_htable::recursion into task_struct.
perf: Shrink the size of the recursion counter.
perf: Enqueue SIGTRAP always via task_work.
task_work: Add TWA_NMI_CURRENT as an additional notify mode.
perf: Move irq_work_queue() where the event is prepared.
perf: Fix event leak upon exec and file release
perf: Fix event leak upon exit
task_work: Introduce task_work_cancel() again
task_work: s/task_work_cancel()/task_work_cancel_func()/
perf/x86/amd/uncore: Fix DF and UMC domain identification
perf/x86/amd/uncore: Avoid PMU registration if counters are unavailable
perf/x86/intel: Support Perfmon MSRs aliasing
perf/x86/intel: Support PERFEVTSEL extension
perf/x86: Add config_mask to represent EVENTSEL bitmask
...
explicitly specify the flag if there's a valid reason to show it in
/proc/cpuinfo
- Switch a bunch of Intel x86 model checking code to the new CPU model
defines
- Fixes and cleanups
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Merge tag 'x86_cpu_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 cpu model updates from Borislav Petkov:
- Flip the logic to add feature names to /proc/cpuinfo to having to
explicitly specify the flag if there's a valid reason to show it in
/proc/cpuinfo
- Switch a bunch of Intel x86 model checking code to the new CPU model
defines
- Fixes and cleanups
* tag 'x86_cpu_for_v6.11_rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/cpu/intel: Drop stray FAM6 check with new Intel CPU model defines
x86/cpufeatures: Flip the /proc/cpuinfo appearance logic
x86/CPU/AMD: Always inline amd_clear_divider()
x86/mce/inject: Add missing MODULE_DESCRIPTION() line
perf/x86/rapl: Switch to new Intel CPU model defines
x86/boot: Switch to new Intel CPU model defines
x86/cpu: Switch to new Intel CPU model defines
perf/x86/intel: Switch to new Intel CPU model defines
x86/virt/tdx: Switch to new Intel CPU model defines
x86/PCI: Switch to new Intel CPU model defines
x86/cpu/intel: Switch to new Intel CPU model defines
x86/platform/intel-mid: Switch to new Intel CPU model defines
x86/pconfig: Remove unused MKTME pconfig code
x86/cpu: Remove useless work in detect_tme_early()
Currently, the Sapphire Rapids and Granite Rapids share the same PMU
name, sapphire_rapids. Because from the kernel’s perspective, GNR is
similar to SPR. The only key difference is that they support different
extra MSRs. The code path and the PMU name are shared.
However, from end users' perspective, they are quite different. Besides
the extra MSRs, GNR has a newer PEBS format, supports Retire Latency,
supports new CPUID enumeration architecture, doesn't required the
load-latency AUX event, has additional TMA Level 1 Architectural Events,
etc. The differences can be enumerated by CPUID or the PERF_CAPABILITIES
MSR. They weren't reflected in the model-specific kernel setup.
But it is worth to have a distinct PMU name for GNR.
Fixes: a6742cb90b ("perf/x86/intel: Fix the FRONTEND encoding on GNR and MTL")
Suggested-by: Ahmad Yasin <ahmad.yasin@intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20240708193336.1192217-3-kan.liang@linux.intel.com
A non-0 retire latency can be observed on a Raptorlake which doesn't
support the retire latency feature.
By design, the retire latency shares the PERF_SAMPLE_WEIGHT_STRUCT
sample type with other types of latency. That could avoid adding too
many different sample types to support all kinds of latency. For the
machine which doesn't support some kind of latency, 0 should be
returned.
Perf doesn’t clear/init all the fields of a sample data for the sake
of performance. It expects the later perf_{prepare,output}_sample() to
update the uninitialized field. However, the current implementation
doesn't touch the field of the retire latency if the feature is not
supported. The memory garbage is dumped into the perf data.
Clear the retire latency if the feature is not supported.
Fixes: c87a31093c ("perf/x86: Support Retire Latency")
Reported-by: "Bayduraev, Alexey V" <alexey.v.bayduraev@intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: "Bayduraev, Alexey V" <alexey.v.bayduraev@intel.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20240708193336.1192217-4-kan.liang@linux.intel.com
The below error is observed on Ice Lake VM.
$ perf stat
Error:
The sys_perf_event_open() syscall returned with 22 (Invalid argument)
for event (slots).
/bin/dmesg | grep -i perf may provide additional information.
In a virtualization env, the Topdown metrics and the slots event haven't
been supported yet. The guest CPUID doesn't enumerate them. However, the
current kernel unconditionally exposes the slots event and the Topdown
metrics events to sysfs, which misleads the perf tool and triggers the
error.
Hide the perf-metrics topdown events and the slots event if the
perf-metrics feature is not enumerated.
The big core of a hybrid platform can also supports the perf-metrics
feature. Fix the hybrid platform as well.
Closes: https://lore.kernel.org/lkml/CAM9d7cj8z+ryyzUHR+P1Dcpot2jjW+Qcc4CPQpfafTXN=LEU0Q@mail.gmail.com/
Reported-by: Dongli Zhang <dongli.zhang@oracle.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Dongli Zhang <dongli.zhang@oracle.com>
Link: https://lkml.kernel.org/r/20240708193336.1192217-2-kan.liang@linux.intel.com
The perf stat errors out with UNC_CHA_TOR_INSERTS.IA_HIT_CXL_ACC_LOCAL
event.
$perf stat -e uncore_cha_55/event=0x35,umask=0x10c0008101/ -a -- ls
event syntax error: '..0x35,umask=0x10c0008101/'
\___ Bad event or PMU
The definition of the CHA umask is config:8-15,32-55, which is 32bit.
However, the umask of the event is bigger than 32bit.
This is an error in the original uncore spec.
Add a new umask_ext5 for the new CHA umask range.
Fixes: 949b11381f ("perf/x86/intel/uncore: Add Sapphire Rapids server CHA support")
Closes: https://lore.kernel.org/linux-perf-users/alpine.LRH.2.20.2401300733310.11354@Diego/
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20240708185524.1185505-1-kan.liang@linux.intel.com
The architectural performance monitoring V6 supports a new range of
counters' MSRs in the 19xxH address range. They include all the GP
counter MSRs, the GP control MSRs, and the fixed counter MSRs.
The step between each sibling counter is 4. Add intel_pmu_addr_offset()
to calculate the correct offset.
Add fixedctr in struct x86_pmu to store the address of the fixed counter
0. It can be used to calculate the rest of the fixed counters.
The MSR address of the fixed counter control is not changed.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-9-kan.liang@linux.intel.com
Two new fields (the unit mask2, and the equal flag) are added in the
IA32_PERFEVTSELx MSRs. They can be enumerated by the CPUID.23H.0.EBX.
Update the config_mask in x86_pmu and x86_hybrid_pmu for the true layout
of the PERFEVTSEL.
Expose the new formats into sysfs if they are available. The umask
extension reuses the same format attr name "umask" as the previous
umask. Add umask2_show to determine/display the correct format
for the current machine.
Co-developed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-8-kan.liang@linux.intel.com
Different vendors may support different fields in EVENTSEL MSR, such as
Intel would introduce new fields umask2 and eq bits in EVENTSEL MSR
since Perfmon version 6. However, a fixed mask X86_RAW_EVENT_MASK is
used to filter the attr.config.
Introduce a new config_mask to record the real supported EVENTSEL
bitmask.
Only apply it to the existing code now. No functional change.
Co-developed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-7-kan.liang@linux.intel.com
A new PEBS data source format is introduced for the p-core of Lunar
Lake. The data source field is extended to 8 bits with new encodings.
A new layout is introduced into the union intel_x86_pebs_dse.
Introduce the lnl_latency_data() to parse the new format.
Enlarge the pebs_data_source[] accordingly to include new encodings.
Only the mem load and the mem store events can generate the data source.
Introduce INTEL_HYBRID_LDLAT_CONSTRAINT and
INTEL_HYBRID_STLAT_CONSTRAINT to mark them.
Add two new bits for the new cache-related data src, L2_MHB and MSC.
The L2_MHB is short for L2 Miss Handling Buffer, which is similar to
LFB (Line Fill Buffer), but to track the L2 Cache misses.
The MSC stands for the memory-side cache.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-6-kan.liang@linux.intel.com
The model-specific pebs_latency_data functions of ADL and MTL use the
"small" as a postfix to indicate the e-core. The postfix is too generic
for a model-specific function. It cannot provide useful information that
can directly map it to a specific uarch, which can facilitate the
development and maintenance.
Use the abbr of the uarch to rename the model-specific functions.
Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-5-kan.liang@linux.intel.com
From PMU's perspective, Lunar Lake and Arrow Lake are similar to the
previous generation Meteor Lake. Both are hybrid platforms, with e-core
and p-core.
The key differences include:
- The e-core supports 3 new fixed counters
- The p-core supports an updated PEBS Data Source format
- More GP counters (Updated event constraint table)
- New Architectural performance monitoring V6
(New Perfmon MSRs aliasing, umask2, eq).
- New PEBS format V6 (Counters Snapshotting group)
- New RDPMC metrics clear mode
The legacy features, the 3 new fixed counters and updated event
constraint table are enabled in this patch.
The new PEBS data source format, the architectural performance
monitoring V6, the PEBS format V6, and the new RDPMC metrics clear mode
are supported in the following patches.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-4-kan.liang@linux.intel.com
The current perf assumes that both GP and fixed counters are contiguous.
But it's not guaranteed on newer Intel platforms or in a virtualization
environment.
Use the counter mask to replace the number of counters for both GP and
the fixed counters. For the other ARCHs or old platforms which don't
support a counter mask, using GENMASK_ULL(num_counter - 1, 0) to
replace. There is no functional change for them.
The interface to KVM is not changed. The number of counters still be
passed to KVM. It can be updated later separately.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-3-kan.liang@linux.intel.com
The current perf assumes that the counters that support PEBS are
contiguous. But it's not guaranteed with the new leaf 0x23 introduced.
The counters are enumerated with a counter mask. There may be holes in
the counter mask for future platforms or in a virtualization
environment.
Store the PEBS event mask rather than the maximum number of PEBS
counters in the x86 PMU structures.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Reviewed-by: Ian Rogers <irogers@google.com>
Link: https://lkml.kernel.org/r/20240626143545.480761-2-kan.liang@linux.intel.com
Compared with previous client platforms, PC8 is removed from Lunarlake.
It supports CC1/CC6/CC7 and PC2/PC3/PC6/PC10 residency counters.
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Link: https://lore.kernel.org/r/20240628031758.43103-4-rui.zhang@intel.com
For Alderlake, the spec changes after the patch submitted and PC7/PC9
are removed.
Raptorlake and Meteorlake, which copy the Alderlake cstate PMU, also
don't have PC7/PC9.
Remove PC7/PC9 support for Alderlake/Raptorlake/Meteorlake.
Fixes: d0ca946bcf ("perf/x86/cstate: Add Alder Lake CPU support")
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Link: https://lore.kernel.org/r/20240628031758.43103-2-rui.zhang@intel.com
Currently, perf allocates an array of page pointers which is limited in
size by MAX_PAGE_ORDER. That in turn limits the maximum Intel PT buffer
size to 2GiB. Should that limitation be lifted, the Intel PT driver can
support larger sizes, except for one calculation in
pt_topa_entry_for_page(), which is limited to 32-bits.
Fix pt_topa_entry_for_page() address calculation by adding a cast.
Fixes: 39152ee51b ("perf/x86/intel/pt: Get rid of reverse lookup table for ToPA")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240624201101.60186-4-adrian.hunter@intel.com
topa_entry->base is a bit-field. Bit-fields are not promoted to a 64-bit
type, even if the underlying type is 64-bit, and so, if necessary, must
be cast to a larger type when calculations are done.
Fix a topa_entry->base address calculation by adding a cast.
Without the cast, the address was limited to 36-bits i.e. 64GiB.
The address calculation is used on systems that do not support Multiple
Entry ToPA (only Broadwell), and affects physical addresses on or above
64GiB. Instead of writing to the correct address, the address comprising
the first 36 bits would be written to.
Intel PT snapshot and sampling modes are not affected.
Fixes: 52ca9ced3f ("perf/x86/intel/pt: Add Intel PT PMU driver")
Reported-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240624201101.60186-3-adrian.hunter@intel.com
topa_entry->base needs to store a pfn. It obviously needs to be
large enough to store the largest possible x86 pfn which is
MAXPHYADDR-PAGE_SIZE (52-12). So it is 4 bits too small.
Increase the size of topa_entry->base from 36 bits to 40 bits.
Note, systems where physical addresses can be 256TiB or more are affected.
[ Adrian: Amend commit message as suggested by Dave Hansen ]
Fixes: 52ca9ced3f ("perf/x86/intel/pt: Add Intel PT PMU driver")
Signed-off-by: Marco Cavenati <cavenati.marco@gmail.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240624201101.60186-2-adrian.hunter@intel.com
Unknown uncore PMON types can be found in both SPR and EMR with HBM or
CXL.
$ls /sys/devices/ | grep type
uncore_type_12_16
uncore_type_12_18
uncore_type_12_2
uncore_type_12_4
uncore_type_12_6
uncore_type_12_8
uncore_type_13_17
uncore_type_13_19
uncore_type_13_3
uncore_type_13_5
uncore_type_13_7
uncore_type_13_9
The unknown PMON types are HBM and CXL PMON. Except for the name, the
other information regarding the HBM and CXL PMON counters can be
retrieved via the discovery table. Add them into the uncores tables for
SPR and EMR.
The event config registers for all CXL related units are 8-byte apart.
Add SPR_UNCORE_MMIO_OFFS8_COMMON_FORMAT to specially handle it.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20240614134631.1092359-9-kan.liang@linux.intel.com
The unit control and ID information are retrieved from the unit control
RB tree. No one uses the old structure anymore. Remove them.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20240614134631.1092359-8-kan.liang@linux.intel.com
The unit control RB tree has the unit control and unit ID information
for all the PCI units. Use them to replace the box_ctls/pci_offsets to
get an accurate unit control address for PCI uncore units.
The UPI/M3UPI units in the discovery table are ignored. Please see the
commit 65248a9a9e ("perf/x86/uncore: Add a quirk for UPI on SPR").
Manually allocate a unit control RB tree for UPI/M3UPI.
Add cleanup_extra_boxes to release such manual allocation.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20240614134631.1092359-7-kan.liang@linux.intel.com
The unit control RB tree has the unit control and unit ID information
for all the MSR units. Use them to replace the box_ctl and
uncore_msr_box_ctl() to get an accurate unit control address for MSR
uncore units.
Add intel_generic_uncore_assign_hw_event(), which utilizes the accurate
unit control address from the unit control RB tree to calculate the
config_base and event_base.
The unit id related information should be retrieved from the unit
control RB tree as well.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20240614134631.1092359-6-kan.liang@linux.intel.com
The unit control RB tree has the unit control and unit ID information
for all the units. Use it to replace the box_ctls/mmio_offsets to get
an accurate unit control address for MMIO uncore units.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20240614134631.1092359-5-kan.liang@linux.intel.com
The box_ids only save the unit ID for the first die. If a unit, e.g., a
CXL unit, doesn't exist in the first die. The unit ID cannot be
retrieved.
The unit control RB tree also stores the unit ID information.
Retrieve the unit ID from the unit control RB tree
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20240614134631.1092359-4-kan.liang@linux.intel.com
The cpumask of some uncore units, e.g., CXL uncore units, may be wrong
under some configurations. Perf may access an uncore counter of a
non-existent uncore unit.
The uncore driver assumes that all uncore units are symmetric among
dies. A global cpumask is shared among all uncore PMUs. However, some
CXL uncore units may only be available on some dies.
A per PMU cpumask is introduced to track the CPU mask of this PMU.
The driver searches the unit control RB tree to check whether the PMU is
available on a given die, and updates the per PMU cpumask accordingly.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Yunying Sun <yunying.sun@intel.com>
Link: https://lore.kernel.org/r/20240614134631.1092359-3-kan.liang@linux.intel.com
The unit control address of some CXL units may be wrongly calculated
under some configuration on a EMR machine.
The current implementation only saves the unit control address of the
units from the first die, and the first unit of the rest of dies. Perf
assumed that the units from the other dies have the same offset as the
first die. So the unit control address of the rest of the units can be
calculated. However, the assumption is wrong, especially for the CXL
units.
Introduce an RB tree for each uncore type to save the unit control
address and three kinds of ID information (unit ID, PMU ID, and die ID)
for all units.
The unit ID is a physical ID of a unit.
The PMU ID is a logical ID assigned to a unit. The logical IDs start
from 0 and must be contiguous. The physical ID and the logical ID are
1:1 mapping. The units with the same physical ID in different dies share
the same PMU.
The die ID indicates which die a unit belongs to.
The RB tree can be searched by two different keys (unit ID or PMU ID +
die ID). During the RB tree setup, the unit ID is used as a key to look
up the RB tree. The perf can create/assign a proper PMU ID to the unit.
Later, after the RB tree is setup, PMU ID + die ID is used as a key to
look up the RB tree to fill the cpumask of a PMU. It's used more
frequently, so PMU ID + die ID is compared in the unit_less().
The uncore_find_unit() has to be O(N). But the RB tree setup only occurs
once during the driver load time. It should be acceptable.
Compared with the current implementation, more space is required to save
the information of all units. The extra size should be acceptable.
For example, on EMR, there are 221 units at most. For a 2-socket machine,
the extra space is ~6KB at most.
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240614134631.1092359-2-kan.liang@linux.intel.com
New CPU #defines encode vendor and family as well as model.
Update INTEL_CPU_DESC() to work with vendor/family/model.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20240520224620.9480-34-tony.luck%40intel.com
Here is the small set of driver core and kernfs changes for 6.10-rc1.
Nothing major here at all, just a small set of changes for some driver
core apis, and minor fixups. Included in here are:
- sysfs_bin_attr_simple_read() helper added and used
- device_show_string() helper added and used
All usages of these were acked by the various maintainers. Also in here
are:
- kernfs minor cleanup
- removed unused functions
- typo fix in documentation
- pay attention to sysfs_create_link() failures in module.c finally.
All of these have been in linux-next for a very long time with no
reported problems.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH:
"Here is the small set of driver core and kernfs changes for 6.10-rc1.
Nothing major here at all, just a small set of changes for some driver
core apis, and minor fixups. Included in here are:
- sysfs_bin_attr_simple_read() helper added and used
- device_show_string() helper added and used
All usages of these were acked by the various maintainers. Also in
here are:
- kernfs minor cleanup
- removed unused functions
- typo fix in documentation
- pay attention to sysfs_create_link() failures in module.c finally
All of these have been in linux-next for a very long time with no
reported problems"
* tag 'driver-core-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
device property: Fix a typo in the description of device_get_child_node_count()
kernfs: mount: Remove unnecessary ‘NULL’ values from knparent
scsi: Use device_show_string() helper for sysfs attributes
platform/x86: Use device_show_string() helper for sysfs attributes
perf: Use device_show_string() helper for sysfs attributes
IB/qib: Use device_show_string() helper for sysfs attributes
hwmon: Use device_show_string() helper for sysfs attributes
driver core: Add device_show_string() helper for sysfs attributes
treewide: Use sysfs_bin_attr_simple_read() helper
sysfs: Add sysfs_bin_attr_simple_read() helper
module: don't ignore sysfs_create_link() failures
driver core: Remove unused platform_notify, platform_notify_remove
Use of this structure was removed in:
8f2a28c585 ("perf/x86/cstate: Use new probe function")
Remove the now stale type as well.
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Deduplicate sysfs ->show() callbacks which expose a string at a static
memory location. Use the newly introduced device_show_string() helper
in the driver core instead by declaring those sysfs attributes with
DEVICE_STRING_ATTR_RO().
No functional change intended.
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Link: https://lore.kernel.org/r/3a297850312b4ecb62d6872121de04496900f502.1713608122.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
