kernel/linux.git/drivers/cpufreq/intel_pstate.c, branch v7.1

cpufreq: intel_pstate: Use HYBRID_SCALING_FACTOR_ADL for Bartlett Lake

2026-05-13T19:44:44+00:00

Bartlett Lake P-core only SKUs (e.g. Intel Core 9 273PE) do not report X86_FEATURE_HYBRID_CPU and are not in intel_hybrid_scaling_factor[]. In hwp_get_cpu_scaling(), the non-hybrid fallback then applies core_get_scaling() (100000), producing cpuinfo_max_freq values that exceed the documented Max Turbo Frequency: intel_pstate: CPU0: PERF_CTL turbo = 57 intel_pstate: CPU0: HWP_CAP guaranteed = 30 intel_pstate: CPU0: HWP_CAP highest = 70 intel_pstate: CPU0: HWP-to-frequency scaling factor: 100000 intel_pstate: set_policy cpuinfo.max 7000000 policy->max 7000000 ... intel_pstate: CPU12: PERF_CTL turbo = 57 intel_pstate: CPU12: HWP_CAP guaranteed = 30 intel_pstate: CPU12: HWP_CAP highest = 73 intel_pstate: CPU12: HWP-to-frequency scaling factor: 100000 intel_pstate: set_policy cpuinfo.max 7300000 policy->max 7300000 ... Per the Intel datasheet [1], the Intel Core 9 273PE specifies: Performance-cores: 12 Efficient-cores: 0 Max Turbo Frequency: 5.7 GHz Intel Thermal Velocity Boost Frequency: 5.7 GHz Intel Turbo Boost Max Technology 3.0 Frequency: 5.6 GHz Performance-core Max Turbo Frequency: 5.4 GHz Performance-core Base Frequency: 2.3 GHz Bartlett Lake P-cores are Raptor Cove cores, per commit d466304c4322 ("x86/cpu: Add CPU model number for Bartlett Lake CPUs with Raptor Cove cores"). The Alder Lake and Raptor Lake P-core entries in intel_hybrid_scaling_factor[] use HYBRID_SCALING_FACTOR_ADL (78741). The same factor applies to Bartlett Lake. Add Bartlett Lake to intel_hybrid_scaling_factor[] with HYBRID_SCALING_FACTOR_ADL so HWP performance levels map to the correct CPU frequencies matching the datasheet's Max Turbo Frequency. Link: https://www.intel.com/content/www/us/en/products/sku/245717/intel-core-9-processor-273pe-36m-cache-up-to-5-70-ghz/specifications.html [1] Signed-off-by: Henry Tseng [ rjw: Changelog tweak ] Link: https://patch.msgid.link/20260513102847.75179-1-henrytseng@qnap.com Signed-off-by: Rafael J. Wysocki

cpufreq: intel_pstate: Use correct scaling factor on Raptor Lake-E

2026-05-13T19:42:07+00:00

Raptor Lake-E has the same processor ID as Raptor Lake-S, so there is an entry in intel_hybrid_scaling_factor[] for it. It does not contain E-cores though and hybrid_get_cpu_type() returns 0 for its P-cores, so they get the default "core" scaling factor. However, the original Raptor Lake scaling factor for P-cores still needs to be used for mapping the HWP performance levels of the P-cores in Raptor Lake-E to frequency, as though they were part of a real hybrid system. To address this, update hwp_get_cpu_scaling() to return hybrid_scaling_factor, which is the P-core scaling factor retrieved from intel_hybrid_scaling_factor[], for all CPUs that are not enumerated as E-cores. Fixes: 9b18d536b124 ("cpufreq: intel_pstate: Use CPPC to get scaling factors") Link: https://lore.kernel.org/all/20260511235328.2018458-1-srinivas.pandruvada@linux.intel.com/ Reported-by: Henry Tseng Closes: https://lore.kernel.org/linux-pm/20260508063032.3248602-1-henrytseng@qnap.com/ Signed-off-by: Rafael J. Wysocki Cc: All applicable Link: https://patch.msgid.link/4523296.ejJDZkT8p0@rafael.j.wysocki

Merge tag 'trace-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace

2026-04-17T16:43:12+00:00

Pull tracing updates from Steven Rostedt: - Fix printf format warning for bprintf sunrpc uses a trace_printk() that triggers a printf warning during the compile. Move the __printf() attribute around for when debugging is not enabled the warning will go away - Remove redundant check for EVENT_FILE_FL_FREED in event_filter_write() The FREED flag is checked in the call to event_file_file() and then checked again right afterward, which is unneeded - Clean up event_file_file() and event_file_data() helpers These helper functions played a different role in the past, but now with eventfs, the READ_ONCE() isn't needed. Simplify the code a bit and also add a warning to event_file_data() if the file or its data is not present - Remove updating file->private_data in tracing open All access to the file private data is handled by the helper functions, which do not use file->private_data. Stop updating it on open - Show ENUM names in function arguments via BTF in function tracing When showing the function arguments when func-args option is set for function tracing, if one of the arguments is found to be an enum, show the name of the enum instead of its number - Add new trace_call__##name() API for tracepoints Tracepoints are enabled via static_branch() blocks, where when not enabled, there's only a nop that is in the code where the execution will just skip over it. When tracing is enabled, the nop is converted to a direct jump to the tracepoint code. Sometimes more calculations are required to be performed to update the parameters of the tracepoint. In this case, trace_##name##_enabled() is called which is a static_branch() that gets enabled only when the tracepoint is enabled. This allows the extra calculations to also be skipped by the nop: if (trace_foo_enabled()) { x = bar(); trace_foo(x); } Where the x=bar() is only performed when foo is enabled. The problem with this approach is that there's now two static_branch() calls. One for checking if the tracepoint is enabled, and then again to know if the tracepoint should be called. The second one is redundant Introduce trace_call__foo() that will call the foo() tracepoint directly without doing a static_branch(): if (trace_foo_enabled()) { x = bar(); trace_call__foo(); } - Update various locations to use the new trace_call__##name() API - Move snapshot code out of trace.c Cleaning up trace.c to not be a "dump all", move the snapshot code out of it and into a new trace_snapshot.c file - Clean up some "%*.s" to "%*s" - Allow boot kernel command line options to be called multiple times Have options like: ftrace_filter=foo ftrace_filter=bar ftrace_filter=zoo Equal to: ftrace_filter=foo,bar,zoo - Fix ipi_raise event CPU field to be a CPU field The ipi_raise target_cpus field is defined as a __bitmask(). There is now a __cpumask() field definition. Update the field to use that - Have hist_field_name() use a snprintf() and not a series of strcat() It's safer to use snprintf() that a series of strcat() - Fix tracepoint regfunc balancing A tracepoint can define a "reg" and "unreg" function that gets called before the tracepoint is enabled, and after it is disabled respectively. But on error, after the "reg" func is called and the tracepoint is not enabled, the "unreg" function is not called to tear down what the "reg" function performed - Fix output that shows what histograms are enabled Event variables are displayed incorrectly in the histogram output Instead of "sched.sched_wakeup.$var", it is showing "$sched.sched_wakeup.var" where the '$' is in the incorrect location - Some other simple cleanups * tag 'trace-v7.1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (24 commits) selftests/ftrace: Add test case for fully-qualified variable references tracing: Fix fully-qualified variable reference printing in histograms tracepoint: balance regfunc() on func_add() failure in tracepoint_add_func() tracing: Rebuild full_name on each hist_field_name() call tracing: Report ipi_raise target CPUs as cpumask tracing: Remove duplicate latency_fsnotify() stub tracing: Preserve repeated trace_trigger boot parameters tracing: Append repeated boot-time tracing parameters tracing: Remove spurious default precision from show_event_trigger/filter formats cpufreq: Use trace_call__##name() at guarded tracepoint call sites tracing: Remove tracing_alloc_snapshot() when snapshot isn't defined tracing: Move snapshot code out of trace.c and into trace_snapshot.c mm: damon: Use trace_call__##name() at guarded tracepoint call sites btrfs: Use trace_call__##name() at guarded tracepoint call sites spi: Use trace_call__##name() at guarded tracepoint call sites i2c: Use trace_call__##name() at guarded tracepoint call sites kernel: Use trace_call__##name() at guarded tracepoint call sites tracepoint: Add trace_call__##name() API tracing: trace_mmap.h: fix a kernel-doc warning tracing: Pretty-print enum parameters in function arguments ...

Merge tag 'amd-pstate-v7.1-2026-04-02' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux

2026-04-04T18:55:56+00:00

Pull amd-pstate new content for 7.1 (2026-04-02) from Mario Limonciello: "Add support for new features: * CPPC performance priority * Dynamic EPP * Raw EPP * New unit tests for new features Fixes for: * PREEMPT_RT * sysfs files being present when HW missing * Broken/outdated documentation" * tag 'amd-pstate-v7.1-2026-04-02' of ssh://gitolite.kernel.org/pub/scm/linux/kernel/git/superm1/linux: (22 commits) MAINTAINERS: amd-pstate: Step down as maintainer, add Prateek as reviewer cpufreq: Pass the policy to cpufreq_driver->adjust_perf() cpufreq/amd-pstate: Pass the policy to amd_pstate_update() cpufreq/amd-pstate-ut: Add a unit test for raw EPP cpufreq/amd-pstate: Add support for raw EPP writes cpufreq/amd-pstate: Add support for platform profile class cpufreq/amd-pstate: add kernel command line to override dynamic epp cpufreq/amd-pstate: Add dynamic energy performance preference Documentation: amd-pstate: fix dead links in the reference section cpufreq/amd-pstate: Cache the max frequency in cpudata Documentation/amd-pstate: Add documentation for amd_pstate_floor_{freq,count} Documentation/amd-pstate: List amd_pstate_prefcore_ranking sysfs file Documentation/amd-pstate: List amd_pstate_hw_prefcore sysfs file amd-pstate-ut: Add a testcase to validate the visibility of driver attributes amd-pstate-ut: Add module parameter to select testcases amd-pstate: Introduce a tracepoint trace_amd_pstate_cppc_req2() amd-pstate: Add sysfs support for floor_freq and floor_count amd-pstate: Add support for CPPC_REQ2 and FLOOR_PERF x86/cpufeatures: Add AMD CPPC Performance Priority feature. amd-pstate: Make certain freq_attrs conditionally visible ...

cpufreq: Pass the policy to cpufreq_driver->adjust_perf()

2026-04-02T16:30:24+00:00

cpufreq_cpu_get() can sleep on PREEMPT_RT in presence of concurrent writer(s), however amd-pstate depends on fetching the cpudata via the policy's driver data which necessitates grabbing the reference. Since schedutil governor can call "cpufreq_driver->update_perf()" during sched_tick/enqueue/dequeue with rq_lock held and IRQs disabled, fetching the policy object using the cpufreq_cpu_get() helper in the scheduler fast-path leads to "BUG: scheduling while atomic" on PREEMPT_RT [1]. Pass the cached cpufreq policy object in sg_policy to the update_perf() instead of just the CPU. The CPU can be inferred using "policy->cpu". The lifetime of cpufreq_policy object outlasts that of the governor and the cpufreq driver (allocated when the CPU is onlined and only reclaimed when the CPU is offlined / the CPU device is removed) which makes it safe to be referenced throughout the governor's lifetime. Closes:https://lore.kernel.org/all/20250731092316.3191-1-spasswolf@web.de/ [1] Fixes: 1d215f0319c2 ("cpufreq: amd-pstate: Add fast switch function for AMD P-State") Reported-by: Bert Karwatzki Acked-by: Viresh Kumar Signed-off-by: K Prateek Nayak Acked-by: Gary Guo # Rust Reviewed-by: Gautham R. Shenoy Reviewed-by: Zhongqiu Han Link: https://lore.kernel.org/r/20260316081849.19368-3-kprateek.nayak@amd.com Signed-off-by: Mario Limonciello (AMD)

cpufreq: Use trace_call__##name() at guarded tracepoint call sites

2026-03-28T17:37:06+00:00

Replace trace_foo() with the new trace_call__foo() at sites already guarded by trace_foo_enabled(), avoiding a redundant static_branch_unlikely() re-evaluation inside the tracepoint. trace_call__foo() calls the tracepoint callbacks directly without utilizing the static branch again. Cc: Huang Rui Cc: Mario Limonciello Cc: Perry Yuan Cc: "Rafael J. Wysocki" Cc: Viresh Kumar Cc: Srinivas Pandruvada Cc: Len Brown Link: https://patch.msgid.link/20260323160052.17528-7-vineeth@bitbyteword.org Suggested-by: Steven Rostedt Suggested-by: Peter Zijlstra Signed-off-by: Vineeth Pillai (Google) Assisted-by: Claude:claude-sonnet-4-6 Acked-by: Rafael J. Wysocki (Intel) # cpufreq core Reviewed-by: Gautham R. Shenoy Signed-off-by: Steven Rostedt (Google)

cpufreq: intel_pstate: Allow repeated intel_pstate disable

2026-03-06T18:18:28+00:00

Repeated intel_pstate disables currently return an error, adding unnecessary complexity to userspace scripts which must first read the current state and conditionally write 'off'. Make repeated intel_pstate disables a no-op. Signed-off-by: Fabio M. De Francesco Acked-by: Srinivas Pandruvada Link: https://patch.msgid.link/20260219181600.16388-1-fabio.m.de.francesco@linux.intel.com Signed-off-by: Rafael J. Wysocki

cpufreq: intel_pstate: Fix crash during turbo disable

2026-02-25T13:39:19+00:00

When the system is booted with kernel command line argument "nosmt" or "maxcpus" to limit the number of CPUs, disabling turbo via: echo 1 > /sys/devices/system/cpu/intel_pstate/no_turbo results in a crash: PF: supervisor read access in kernel mode PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: Oops: 0000 [#1] SMP PTI ... RIP: 0010:store_no_turbo+0x100/0x1f0 ... This occurs because for_each_possible_cpu() returns CPUs even if they are not online. For those CPUs, all_cpu_data[] will be NULL. Since commit 973207ae3d7c ("cpufreq: intel_pstate: Rearrange max frequency updates handling code"), all_cpu_data[] is dereferenced even for CPUs which are not online, causing the NULL pointer dereference. To fix that, pass CPU number to intel_pstate_update_max_freq() and use all_cpu_data[] for those CPUs for which there is a valid cpufreq policy. Fixes: 973207ae3d7c ("cpufreq: intel_pstate: Rearrange max frequency updates handling code") Closes: https://bugzilla.kernel.org/show_bug.cgi?id=221068 Signed-off-by: Srinivas Pandruvada Cc: 6.16+ # 6.16+ Link: https://patch.msgid.link/20260225001752.890164-1-srinivas.pandruvada@linux.intel.com Signed-off-by: Rafael J. Wysocki

cpufreq: intel_pstate: Fix NULL pointer dereference in update_cpu_qos_request()

2026-02-24T14:38:16+00:00

The update_cpu_qos_request() function attempts to initialize the 'freq' variable by dereferencing 'cpudata' before verifying if the 'policy' is valid. This issue occurs on systems booted with the "nosmt" parameter, where all_cpu_data[cpu] is NULL for the SMT sibling threads. As a result, any call to update_qos_requests() will result in a NULL pointer dereference as the code will attempt to access pstate.turbo_freq using the NULL cpudata pointer. Also, pstate.turbo_freq may be updated by intel_pstate_get_hwp_cap() after initializing the 'freq' variable, so it is better to defer the 'freq' until intel_pstate_get_hwp_cap() has been called. Fix this by deferring the 'freq' assignment until after the policy and driver_data have been validated. Fixes: ae1bdd23b99f ("cpufreq: intel_pstate: Adjust frequency percentage computations") Reported-by: Jirka Hladky Closes: https://lore.kernel.org/all/CAE4VaGDfiPvz3AzrwrwM4kWB3SCkMci25nPO8W1JmTBd=xHzZg@mail.gmail.com/ Signed-off-by: David Arcari Cc: 6.18+ # 6.18+ [ rjw: Added one paragraph to the changelog ] Link: https://patch.msgid.link/20260224122106.228116-1-darcari@redhat.com Signed-off-by: Rafael J. Wysocki

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\