Hi all,
The patchset series add core performance boost feature for AMD pstate
driver including passisve ,guide and active mode support.
User can change core frequency boost control with a new sysfs entry:
"/sys/devices/system/cpu/amd_pstate/cpb_boost"
The legancy boost interface has been removed due to the function
conflict with new cpb_boost which can support all modes.
1) disable core boost:
$ sudo bash -c "echo 0 > /sys/devices/system/cpu/amd_pstate/cpb_boost"
$ lscpu -ae
CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE MAXMHZ MINMHZ MHZ
0 0 0 0 0:0:0:0 yes 4201.0000 400.0000 2983.578
1 0 0 1 1:1:1:0 yes 4201.0000 400.0000 2983.578
2 0 0 2 2:2:2:0 yes 4201.0000 400.0000 2583.855
3 0 0 3 3:3:3:0 yes 4201.0000 400.0000 2983.578
4 0 0 4 4:4:4:0 yes 4201.0000 400.0000 2983.578
2) enable core boost:
$ sudo bash -c "echo 1 > /sys/devices/system/cpu/amd_pstate/cpb_boost"
$ lscpu -ae
0 0 0 0 0:0:0:0 yes 5759.0000 400.0000 2983.578
1 0 0 1 1:1:1:0 yes 5759.0000 400.0000 2983.578
2 0 0 2 2:2:2:0 yes 5759.0000 400.0000 2983.578
3 0 0 3 3:3:3:0 yes 5759.0000 400.0000 2983.578
4 0 0 4 4:4:4:0 yes 5759.0000 400.0000 2983.578
The patches have been tested with the AMD 7950X processor and many users
would like to get core boost control enabled for power saving.
If you would like to test this patchset, it needs to apply the patchset
based on below one latest version patchset.
https://lore.kernel.org/lkml/[email protected]/
Perry.
Changes from v7:
* fix the mutext locking issue in the sysfs file update(Ray, Mario)
* pick ack flag from Ray
* use X86_FEATURE_CPB to verify the CPB function in Patch #2(Ray)
* rerun the testing to check function works well
* rebased to linux-pm/bleeding-edge latest
Changes from v6:
* reword patch 2 commit log (Gautham)
* update cover letter description(Gautham)
* rebase to kernel v6.9-rc5
Changes from v4:
* drop the legacy boost remove patch, let us keep the legacy interface
in case some applications break.
* rebase to linux-pm/bleeding-edge branch
* rework the patchset base on [PATCH v8 0/8] AMD Pstate Fixes And
Enhancements which has some intial work done there.
Changes from v4:
* move MSR_K7_HWCR_CPB_DIS_BIT into msr-index.h
* pick RB flag from Gautham R. Shenoy
* add Cc Oleksandr Natalenko <[email protected]>
* rebase to latest linux-pm/bleeding-edge branch
* rebase the patch set on top of [PATCH v7 0/6] AMD Pstate Fixes And Enhancements
* update [PATCH v7 2/6] to use MSR_K7_HWCR_CPB_DIS_BIT
Changes from v3:
* rebased to linux-pm/bleeding-edge v6.8
* rename global to amd_pstate_global_params(Oleksandr Natalenko)
* remove comments for boot_supported in amd_pstate.h
* fix the compiler warning for amd-pstate-ut.ko
* use for_each_online_cpu in cpb_boost_store which fix the null pointer
error during testing
* fix the max frequency value to be KHz when cpb boost disabled(Gautham R. Shenoy)
Changes from v2:
* move global struct to amd-pstate.h
* fix the amd-pstate-ut with new cpb control interface
Changes from v1:
* drop suspend/resume fix patch 6/7 because of the fix should be in
another fix series instead of CPB feature
* move the set_boost remove patch to the last(Mario)
* Fix commit info with "Closes:" (Mario)
* simplified global.cpb_supported initialization(Mario)
* Add guide mode support for CPB control
* Fixed some Doc typos and add guide mode info to Doc as well.
v1: https://lore.kernel.org/all/[email protected]/
v2: https://lore.kernel.org/lkml/[email protected]/
v3: https://lore.kernel.org/lkml/[email protected]/
v4: https://lore.kernel.org/lkml/[email protected]/
v5: https://lore.kernel.org/lkml/[email protected]/
v6: https://lore.kernel.org/lkml/[email protected]/
v7: https://lore.kernel.org/lkml/[email protected]/
Perry Yuan (6):
cpufreq: acpi: move MSR_K7_HWCR_CPB_DIS_BIT into msr-index.h
cpufreq: amd-pstate: initialize new core precision boost state
cpufreq: amd-pstate: implement cpb_boost sysfs entry for boost control
cpufreq: amd-pstate: fix the MSR highest perf will be reset issue
while cpb boost off
Documentation: cpufreq: amd-pstate: introduce the new cpu boost
control method
cpufreq: amd-pstate-ut: support new cpb boost control interface
Documentation/admin-guide/pm/amd-pstate.rst | 11 ++
arch/x86/include/asm/msr-index.h | 2 +
drivers/cpufreq/acpi-cpufreq.c | 2 -
drivers/cpufreq/amd-pstate-ut.c | 2 +-
drivers/cpufreq/amd-pstate.c | 149 ++++++++++++++++++--
include/linux/amd-pstate.h | 13 ++
6 files changed, 165 insertions(+), 14 deletions(-)
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2.34.1