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ACPI fixes for 5.19-rc6

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- Prevent _CPC from being used if the platform firmware does not
    confirm CPPC v2 support via _OSC (Mario Limonciello).
 
  - Allow systems with X86_FEATURE_CPPC set to use _CPC even if CPPC
    support cannot be agreed on via _OSC (Mario Limonciello).
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Merge tag 'acpi-5.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
 "These fix two recent regressions related to CPPC support.

  Specifics:

   - Prevent _CPC from being used if the platform firmware does not
     confirm CPPC v2 support via _OSC (Mario Limonciello)

   - Allow systems with X86_FEATURE_CPPC set to use _CPC even if CPPC
     support cannot be agreed on via _OSC (Mario Limonciello)"

* tag 'acpi-5.19-rc6' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI: CPPC: Don't require _OSC if X86_FEATURE_CPPC is supported
  ACPI: CPPC: Only probe for _CPC if CPPC v2 is acked
This commit is contained in:
Linus Torvalds 2022-07-08 13:05:56 -07:00
commit 525496a030
5 changed files with 35 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/x86/kernel/acpi/cppc.c
View File

@ -11,6 +11,16 @@
/* Refer to drivers/acpi/cppc_acpi.c for the description of functions */
bool cpc_supported_by_cpu(void)
{
switch (boot_cpu_data.x86_vendor) {
case X86_VENDOR_AMD:
case X86_VENDOR_HYGON:
return boot_cpu_has(X86_FEATURE_CPPC);
}
return false;
}
bool cpc_ffh_supported(void)
{
return true;

11
drivers/acpi/bus.c
View File

@ -298,7 +298,7 @@ EXPORT_SYMBOL_GPL(osc_cpc_flexible_adr_space_confirmed);
bool osc_sb_native_usb4_support_confirmed;
EXPORT_SYMBOL_GPL(osc_sb_native_usb4_support_confirmed);
bool osc_sb_cppc_not_supported;
bool osc_sb_cppc2_support_acked;
static u8 sb_uuid_str[] = "0811B06E-4A27-44F9-8D60-3CBBC22E7B48";
static void acpi_bus_osc_negotiate_platform_control(void)
@ -358,11 +358,6 @@ static void acpi_bus_osc_negotiate_platform_control(void)
return;
}
#ifdef CONFIG_ACPI_CPPC_LIB
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.
@ -376,6 +371,10 @@ static void acpi_bus_osc_negotiate_platform_control(void)
capbuf_ret = context.ret.pointer;
if (context.ret.length > OSC_SUPPORT_DWORD) {
#ifdef CONFIG_ACPI_CPPC_LIB
osc_sb_cppc2_support_acked = capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_CPCV2_SUPPORT;
#endif
osc_sb_apei_support_acked =
capbuf_ret[OSC_SUPPORT_DWORD] & OSC_SB_APEI_SUPPORT;
osc_pc_lpi_support_confirmed =

20
drivers/acpi/cppc_acpi.c
View File

@ -577,6 +577,19 @@ bool __weak cpc_ffh_supported(void)
return false;
}
/**
* cpc_supported_by_cpu() - check if CPPC is supported by CPU
*
* Check if the architectural support for CPPC is present even
* if the _OSC hasn't prescribed it
*
* Return: true for supported, false for not supported
*/
bool __weak cpc_supported_by_cpu(void)
{
return false;
}
/**
* pcc_data_alloc() - Allocate the pcc_data memory for pcc subspace
*
@ -684,8 +697,11 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
acpi_status status;
int ret = -ENODATA;
if (osc_sb_cppc_not_supported)
return -ENODEV;
if (!osc_sb_cppc2_support_acked) {
pr_debug("CPPC v2 _OSC not acked\n");
if (!cpc_supported_by_cpu())
return -ENODEV;
}
/* Parse the ACPI _CPC table for this CPU. */
status = acpi_evaluate_object_typed(handle, "_CPC", NULL, &output,

1
include/acpi/cppc_acpi.h
View File

@ -145,6 +145,7 @@ extern bool cppc_allow_fast_switch(void);
extern int acpi_get_psd_map(unsigned int cpu, struct cppc_cpudata *cpu_data);
extern unsigned int cppc_get_transition_latency(int cpu);
extern bool cpc_ffh_supported(void);
extern bool cpc_supported_by_cpu(void);
extern int cpc_read_ffh(int cpunum, struct cpc_reg *reg, u64 *val);
extern int cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val);
#else /* !CONFIG_ACPI_CPPC_LIB */

2
include/linux/acpi.h
View File

@ -584,7 +584,7 @@ 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;
extern bool osc_sb_cppc2_support_acked;
extern bool osc_cpc_flexible_adr_space_confirmed;
/* USB4 Capabilities */