Messages in this thread Patch in this message | | | From | Ethan Zhao <> | Subject | [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method | Date | Tue, 18 Nov 2014 17:37:04 +0900 |
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Oracle Sun X86 servers have dynamic power capping capability that works via ACPI _PPC method etc, so skip loading this driver if Sun server has ACPI _PPC enabled.
Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com> --- drivers/cpufreq/intel_pstate.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index 27bb6d3..5498eb0 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -943,6 +943,21 @@ static bool intel_pstate_no_acpi_pss(void) return true; } +static bool intel_pstate_has_acpi_ppc(void) +{ + int i; + + for_each_possible_cpu(i) { + struct acpi_processor *pr = per_cpu(processors, i); + + if (!pr) + continue; + if (acpi_has_method(pr->handle, "_PPC")) + return true; + } + return false; +} + struct hw_vendor_info { u16 valid; char oem_id[ACPI_OEM_ID_SIZE]; @@ -952,6 +967,7 @@ struct hw_vendor_info { /* Hardware vendor-specific info that has its own power management modes */ static struct hw_vendor_info vendor_info[] = { {1, "HP ", "ProLiant"}, + {1, "ORACLE", ""}, {0, "", ""}, }; @@ -969,12 +985,16 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void) !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) && intel_pstate_no_acpi_pss()) return true; + if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) && + intel_pstate_has_acpi_ppc()) + return true; } return false; } #else /* CONFIG_ACPI not enabled */ static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; } +static inline bool intel_pstate_has_acpi_ppc(void) { return false; } #endif /* CONFIG_ACPI */ static int __init intel_pstate_init(void) -- 1.8.3.1
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