5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> [ Upstream commit c42fa24b44751c62c86e98430ef915c0609a2ab8 ] If the platform firmware indicates that it does not support CPPC by clearing the OSC_SB_CPC_SUPPORT and OSC_SB_CPCV2_SUPPORT bits in the platform _OSC capabilities mask, avoid attempting to evaluate _CPC which may fail in that case. Because the OSC_SB_CPC_SUPPORT and OSC_SB_CPCV2_SUPPORT bits are only added to the supported platform capabilities mask on x86, when X86_FEATURE_HWP is supported, allow _CPC to be evaluated regardless in the other cases. Link: https://lore.kernel.org/linux-acpi/CAJZ5v0i=ecAksq0TV+iLVObm-=fUfdqPABzzkgm9K6KxO1ZCcg@xxxxxxxxxxxxxx Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Tested-by: Mario Limonciello <mario.limonciello@xxxxxxx> Acked-by: Huang Rui <ray.huang@xxxxxxx> Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> Stable-dep-of: 60949b7b8054 ("ACPI: CPPC: Fix MASK_VAL() usage") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/acpi/bus.c | 8 ++++++++ drivers/acpi/cppc_acpi.c | 3 +++ include/linux/acpi.h | 1 + 3 files changed, 12 insertions(+) diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 7774b603a7962..9bc5bc5bc359b 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -283,6 +283,8 @@ EXPORT_SYMBOL_GPL(osc_pc_lpi_support_confirmed); bool osc_sb_native_usb4_support_confirmed; EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed); +bool osc_sb_cppc_not_supported; + static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48"; static void acpi_bus_osc_negotiate_platform_control(void) { @@ -338,6 +340,12 @@ static void acpi_bus_osc_negotiate_platform_control(void) return; } +#ifdef CONFIG_X86 + if (boot_cpu_has(X86_FEATURE_HWP)) + osc_sb_cppc_not_supported = !(capbuf_ret[OSC_SUPPORT_DWORD] & + (OSC_SB_CPC_SUPPORT | OSC_SB_CPCV2_SUPPORT)); +#endif + /* * Now run _OSC again with query flag clear and with the caps * supported by both the OS and the platform. diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 6dcce036adb9c..02cec9eba937f 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -673,6 +673,9 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) acpi_status status; int ret = -EFAULT; + if (osc_sb_cppc_not_supported) + return -ENODEV; + /* Parse the ACPI _CPC table for this CPU. */ status = acpi_evaluate_object_typed(handle, "_CPC", NULL, &output, ACPI_TYPE_PACKAGE); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index a23a5aea9c817..42f58a54dff09 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -561,6 +561,7 @@ acpi_status acpi_run_osc(acpi_handle handle, struct acpi_osc_context *context); extern bool osc_sb_apei_support_acked; extern bool osc_pc_lpi_support_confirmed; extern bool osc_sb_native_usb4_support_confirmed; +extern bool osc_sb_cppc_not_supported; /* USB4 Capabilities */ #define OSC_USB_USB3_TUNNELING 0x00000001 -- 2.43.0
