| Message ID | 20230417152708.3599-1-mario.limonciello@amd.com |
|---|---|
| Headers | show |
| Series | Add vendor agnostic mechanism to report hardware sleep | expand |
On Mon, Apr 17, 2023 at 5:27 PM Mario Limonciello <mario.limonciello@amd.com> wrote: > > An important part of validating that s0ix worked properly is to check how > much of a cycle was spent in a hardware sleep state. > > The reporting of hardware sleep is a mix of kernel messages and sysfs > files that vary from vendor to vendor. Collecting this information > requires extra information on the kernel command line or fetching from > debugfs. > > To make this information more readily accessible introduce a new file in > suspend_stats that drivers can report into during their resume routine. > > Userspace can fetch this information and compare it against the duration > of the cycle to allow determining residency percentages and flagging > problems. > > v9->v10: > * Add tags > * Rebase on linux-pm/bleeding-edge as it will apply through this tree > > Mario Limonciello (4): > PM: Add sysfs files to represent time spent in hardware sleep state > platform/x86/amd: pmc: Report duration of time in hw sleep state > platform/x86/intel/pmc: core: Always capture counters on suspend > platform/x86/intel/pmc: core: Report duration of time in HW sleep > state > > Documentation/ABI/testing/sysfs-power | 29 +++++++++++++ > drivers/platform/x86/amd/pmc.c | 6 +-- > drivers/platform/x86/intel/pmc/core.c | 17 ++++---- > drivers/platform/x86/intel/pmc/core.h | 4 +- > include/linux/suspend.h | 8 ++++ > kernel/power/main.c | 59 +++++++++++++++++++++------ > 6 files changed, 98 insertions(+), 25 deletions(-) > Whole series applied as 6.4-rc1 material, thanks!
An important part of validating that s0ix worked properly is to check how much of a cycle was spent in a hardware sleep state. The reporting of hardware sleep is a mix of kernel messages and sysfs files that vary from vendor to vendor. Collecting this information requires extra information on the kernel command line or fetching from debugfs. To make this information more readily accessible introduce a new file in suspend_stats that drivers can report into during their resume routine. Userspace can fetch this information and compare it against the duration of the cycle to allow determining residency percentages and flagging problems. v9->v10: * Add tags * Rebase on linux-pm/bleeding-edge as it will apply through this tree Mario Limonciello (4): PM: Add sysfs files to represent time spent in hardware sleep state platform/x86/amd: pmc: Report duration of time in hw sleep state platform/x86/intel/pmc: core: Always capture counters on suspend platform/x86/intel/pmc: core: Report duration of time in HW sleep state Documentation/ABI/testing/sysfs-power | 29 +++++++++++++ drivers/platform/x86/amd/pmc.c | 6 +-- drivers/platform/x86/intel/pmc/core.c | 17 ++++---- drivers/platform/x86/intel/pmc/core.h | 4 +- include/linux/suspend.h | 8 ++++ kernel/power/main.c | 59 +++++++++++++++++++++------ 6 files changed, 98 insertions(+), 25 deletions(-) base-commit: 0962c5df83b088fad0c531257744fb7a1e83221c