[AMD Official Use Only - General]
Hi Peter:
-----Original Message----- From: Peter Zijlstra peterz@infradead.org Sent: Friday, September 8, 2023 9:24 PM To: Meng, Li (Jassmine) Li.Meng@amd.com Cc: Rafael J . Wysocki rafael.j.wysocki@intel.com; Huang, Ray Ray.Huang@amd.com; linux-pm@vger.kernel.org; linux- kernel@vger.kernel.org; x86@kernel.org; linux-acpi@vger.kernel.org; Shuah Khan skhan@linuxfoundation.org; linux-kselftest@vger.kernel.org; Fontenot, Nathan Nathan.Fontenot@amd.com; Sharma, Deepak Deepak.Sharma@amd.com; Deucher, Alexander Alexander.Deucher@amd.com; Limonciello, Mario Mario.Limonciello@amd.com; Huang, Shimmer Shimmer.Huang@amd.com; Yuan, Perry Perry.Yuan@amd.com; Du, Xiaojian Xiaojian.Du@amd.com; Viresh Kumar viresh.kumar@linaro.org; Borislav Petkov bp@alien8.de Subject: Re: [PATCH V5 4/7] cpufreq: Add a notification message that the highest perf has changed
Caution: This message originated from an External Source. Use proper caution when opening attachments, clicking links, or responding.
On Tue, Sep 05, 2023 at 09:51:13AM +0800, Meng Li 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 register. Add support for this event.
Signed-off-by: Meng Li li.meng@amd.com Link: https://uefi.org/specs/ACPI/6.5/08_Processor_Configuration_and_Control .html?highlight=cppc#cpc-continuous-performance-control
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);acpi_bus_generate_netlink_event(device->pnp.device_class,dev_name(&device->dev), event, 0);break; default: acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); break;I've obviously not read the link, but the above seems to suggest that every CPU that has its limits changed gets the 'interrupt' ?
[Meng, Li (Jassmine)] Yes. I will modify the link to https://uefi.org/specs/ACPI/6.5/05_ACPI_Software_Programming_Model.html#proc...