On Wed, Dec 6, 2023 at 9:58 PM Rafael J. Wysocki rafael@kernel.org wrote:
On Tue, Dec 5, 2023 at 7:38 AM Meng Li li.meng@amd.com wrote:
ACPI 6.5 section 8.4.6.1.1.1 specifies that Notify event 0x85 can be emmitted to cause the the OSPM to re-evaluate the highest performance
Typos above. Given the number of iterations of this patch, this is kind of disappointing.
register. Add support for this event.
Also it would be nice to describe how this is supposed to work at least roughly, so it is not necessary to reverse-engineer the patch to find out that.
Tested-by: Oleksandr Natalenko oleksandr@natalenko.name Reviewed-by: Mario Limonciello mario.limonciello@amd.com Reviewed-by: Huang Rui ray.huang@amd.com Reviewed-by: Perry Yuan perry.yuan@amd.com Signed-off-by: Meng Li li.meng@amd.com Link: https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#proc...
drivers/acpi/processor_driver.c | 6 ++++++ drivers/cpufreq/cpufreq.c | 13 +++++++++++++ include/linux/cpufreq.h | 5 +++++ 3 files changed, 24 insertions(+)
diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c index 4bd16b3f0781..29b2fb68a35d 100644 --- a/drivers/acpi/processor_driver.c +++ b/drivers/acpi/processor_driver.c @@ -27,6 +27,7 @@ #define ACPI_PROCESSOR_NOTIFY_PERFORMANCE 0x80 #define ACPI_PROCESSOR_NOTIFY_POWER 0x81 #define ACPI_PROCESSOR_NOTIFY_THROTTLING 0x82 +#define ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED 0x85
MODULE_AUTHOR("Paul Diefenbaugh"); MODULE_DESCRIPTION("ACPI Processor Driver"); @@ -83,6 +84,11 @@ static void acpi_processor_notify(acpi_handle handle, u32 event, void *data) acpi_bus_generate_netlink_event(device->pnp.device_class, dev_name(&device->dev), event, 0); break;
case ACPI_PROCESSOR_NOTIFY_HIGEST_PERF_CHANGED:cpufreq_update_highest_perf(pr->id);And the design appears to be a bit ad-hoc here.
Because why does it have anything to do with cpufreq?
Well, clearly, cpufreq can be affected by this, but why would it be not affected the same way as in the ACPI_PROCESSOR_NOTIFY_PERFORMANCE case?
That is, why isn't cpufreq_update_limits() the right thing to do?