[v9,0/7] AMD Pstate Driver Core Performance Boost

Message

Yuan, Perry May 6, 2024, 10:19 a.m. UTC

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"


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 V9 patches add per CPU boost control, user can enable/disable CPUs boost 
as the below command tested on a laptop system. 
# before  
  CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE    MAXMHZ   MINMHZ       MHZ
  0    0      0    0 0:0:0:0          yes 4208.0000 400.0000 1666.7740
  1    0      0    0 0:0:0:0          yes 4208.0000 400.0000  400.0000
  2    0      0    1 1:1:1:0          yes 4208.0000 400.0000 3386.1260
  3    0      0    1 1:1:1:0          yes 4208.0000 400.0000  400.0000
$ sudo rdmsr 0xc00102b3 -p 0
10a6

$ sudo bash -c "echo 1 > /sys/devices/system/cpu/cpu0/cpufreq/amd_pstate_boost_cpb"
# after
  CPU NODE SOCKET CORE L1d:L1i:L2:L3 ONLINE    MAXMHZ   MINMHZ       MHZ
    0    0      0    0 0:0:0:0          yes 3501.0000 400.0000  400.0000
    1    0      0    0 0:0:0:0          yes 4208.0000 400.0000 1391.0690
    2    0      0    1 1:1:1:0          yes 4208.0000 400.0000 3654.4541
    3    0      0    1 1:1:1:0          yes 4208.0000 400.0000  400.0000
$ sudo rdmsr 0xc00102b3 -p 0
108a


The patches have been tested with the AMD 7950X processor and many users
would like to get core boost control enabled for power saving.

Perry.

Changes from v8:
 * pick RB flag for patch 4 (Mario)
 * change boot_cpu_has to cpu_feature_enabled for patch 2 (Boris)
 * merge patch 6 into patch 3 (Mario)
 * add two patch for per CPU boost control patch 6 & 7(Mario)
 * rebased to latest linux-pm/bleeding-edge

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 <[e-mail]>
 * 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/[e-mail]/
v2: https://lore.kernel.org/lkml/[e-mail]/
v3: https://lore.kernel.org/lkml/[e-mail]/
v4: https://lore.kernel.org/lkml/[e-mail]/
v5: https://lore.kernel.org/lkml/[e-mail]/
v6: https://lore.kernel.org/lkml/[e-mail]/
v7: https://lore.kernel.org/lkml/[e-mail]/
v8: https://lore.kernel.org/lkml/[e-mail]/

Perry Yuan (7):
  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: introduce per CPU frequency boost control
  Documentation: cpufreq: amd-pstate: update doc for Per CPU  boost
    control method

 Documentation/admin-guide/pm/amd-pstate.rst |  31 ++++
 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                | 189 ++++++++++++++++++--
 include/linux/amd-pstate.h                  |  14 ++
 6 files changed, 226 insertions(+), 14 deletions(-)