diff options
Diffstat (limited to '0001-ACPI-processor-Request-native-thermal-interrupt-hand.patch')
| -rw-r--r-- | 0001-ACPI-processor-Request-native-thermal-interrupt-hand.patch | 169 |
1 files changed, 0 insertions, 169 deletions
diff --git a/0001-ACPI-processor-Request-native-thermal-interrupt-hand.patch b/0001-ACPI-processor-Request-native-thermal-interrupt-hand.patch deleted file mode 100644 index a76603900..000000000 --- a/0001-ACPI-processor-Request-native-thermal-interrupt-hand.patch +++ /dev/null @@ -1,169 +0,0 @@ -From a21211672c9a1d730a39aa65d4a5b3414700adfb Mon Sep 17 00:00:00 2001 -From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> -Date: Wed, 23 Mar 2016 21:07:39 -0700 -Subject: [PATCH] ACPI / processor: Request native thermal interrupt handling - via _OSC - -There are several reports of freeze on enabling HWP (Hardware PStates) -feature on Skylake-based systems by the Intel P-states driver. The root -cause is identified as the HWP interrupts causing BIOS code to freeze. - -HWP interrupts use the thermal LVT which can be handled by Linux -natively, but on the affected Skylake-based systems SMM will respond -to it by default. This is a problem for several reasons: - - On the affected systems the SMM thermal LVT handler is broken (it - will crash when invoked) and a BIOS update is necessary to fix it. - - With thermal interrupt handled in SMM we lose all of the reporting - features of the arch/x86/kernel/cpu/mcheck/therm_throt driver. - - Some thermal drivers like x86-package-temp depend on the thermal - threshold interrupts signaled via the thermal LVT. - - The HWP interrupts are useful for debugging and tuning - performance (if the kernel can handle them). -The native handling of thermal interrupts needs to be enabled -because of that. - -This requires some way to tell SMM that the OS can handle thermal -interrupts. That can be done by using _OSC/_PDC in processor -scope very early during ACPI initialization. - -The meaning of _OSC/_PDC bit 12 in processor scope is whether or -not the OS supports native handling of interrupts for Collaborative -Processor Performance Control (CPPC) notifications. Since on -HWP-capable systems CPPC is a firmware interface to HWP, setting -this bit effectively tells the firmware that the OS will handle -thermal interrupts natively going forward. - -For details on _OSC/_PDC refer to: -http://www.intel.com/content/www/us/en/standards/processor-vendor-specific-acpi-specification.html - -To implement the _OSC/_PDC handshake as described, introduce a new -function, acpi_early_processor_osc(), that walks the ACPI -namespace looking for ACPI processor objects and invokes _OSC for -them with bit 12 in the capabilities buffer set and terminates the -namespace walk on the first success. - -Also modify intel_thermal_interrupt() to clear HWP status bits in -the HWP_STATUS MSR to acknowledge HWP interrupts (which prevents -them from firing continuously). - -Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> -[ rjw: Subject & changelog, function rename ] -Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> ---- - arch/x86/kernel/cpu/mcheck/therm_throt.c | 3 ++ - drivers/acpi/acpi_processor.c | 52 ++++++++++++++++++++++++++++++++ - drivers/acpi/bus.c | 3 ++ - drivers/acpi/internal.h | 6 ++++ - 4 files changed, 64 insertions(+) - -diff --git a/arch/x86/kernel/cpu/mcheck/therm_throt.c b/arch/x86/kernel/cpu/mcheck/therm_throt.c -index 2c5aaf8..0553858 100644 ---- a/arch/x86/kernel/cpu/mcheck/therm_throt.c -+++ b/arch/x86/kernel/cpu/mcheck/therm_throt.c -@@ -385,6 +385,9 @@ static void intel_thermal_interrupt(void) - { - __u64 msr_val; - -+ if (static_cpu_has(X86_FEATURE_HWP)) -+ wrmsrl_safe(MSR_HWP_STATUS, 0); -+ - rdmsrl(MSR_IA32_THERM_STATUS, msr_val); - - /* Check for violation of core thermal thresholds*/ -diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c -index b5e54f2..0d92d0f 100644 ---- a/drivers/acpi/acpi_processor.c -+++ b/drivers/acpi/acpi_processor.c -@@ -491,6 +491,58 @@ static void acpi_processor_remove(struct acpi_device *device) - } - #endif /* CONFIG_ACPI_HOTPLUG_CPU */ - -+#ifdef CONFIG_X86 -+static bool acpi_hwp_native_thermal_lvt_set; -+static acpi_status __init acpi_hwp_native_thermal_lvt_osc(acpi_handle handle, -+ u32 lvl, -+ void *context, -+ void **rv) -+{ -+ u8 sb_uuid_str[] = "4077A616-290C-47BE-9EBD-D87058713953"; -+ u32 capbuf[2]; -+ struct acpi_osc_context osc_context = { -+ .uuid_str = sb_uuid_str, -+ .rev = 1, -+ .cap.length = 8, -+ .cap.pointer = capbuf, -+ }; -+ -+ if (acpi_hwp_native_thermal_lvt_set) -+ return AE_CTRL_TERMINATE; -+ -+ capbuf[0] = 0x0000; -+ capbuf[1] = 0x1000; /* set bit 12 */ -+ -+ if (ACPI_SUCCESS(acpi_run_osc(handle, &osc_context))) { -+ if (osc_context.ret.pointer && osc_context.ret.length > 1) { -+ u32 *capbuf_ret = osc_context.ret.pointer; -+ -+ if (capbuf_ret[1] & 0x1000) { -+ acpi_handle_info(handle, -+ "_OSC native thermal LVT Acked\n"); -+ acpi_hwp_native_thermal_lvt_set = true; -+ } -+ } -+ kfree(osc_context.ret.pointer); -+ } -+ -+ return AE_OK; -+} -+ -+void __init acpi_early_processor_osc(void) -+{ -+ if (boot_cpu_has(X86_FEATURE_HWP)) { -+ acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, -+ ACPI_UINT32_MAX, -+ acpi_hwp_native_thermal_lvt_osc, -+ NULL, NULL, NULL); -+ acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, -+ acpi_hwp_native_thermal_lvt_osc, -+ NULL, NULL); -+ } -+} -+#endif -+ - /* - * The following ACPI IDs are known to be suitable for representing as - * processor devices. -diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c -index 891c42d..f9081b7 100644 ---- a/drivers/acpi/bus.c -+++ b/drivers/acpi/bus.c -@@ -1005,6 +1005,9 @@ static int __init acpi_bus_init(void) - goto error1; - } - -+ /* Set capability bits for _OSC under processor scope */ -+ acpi_early_processor_osc(); -+ - /* - * _OSC method may exist in module level code, - * so it must be run after ACPI_FULL_INITIALIZATION -diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h -index 1e6833a..6f41c73 100644 ---- a/drivers/acpi/internal.h -+++ b/drivers/acpi/internal.h -@@ -138,6 +138,12 @@ void acpi_early_processor_set_pdc(void); - static inline void acpi_early_processor_set_pdc(void) {} - #endif - -+#ifdef CONFIG_X86 -+void acpi_early_processor_osc(void); -+#else -+static inline void acpi_early_processor_osc(void) {} -+#endif -+ - /* -------------------------------------------------------------------------- - Embedded Controller - -------------------------------------------------------------------------- */ --- -2.5.5 - |