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@@ -25,6 +25,7 @@
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/debugfs.h>
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+#include <linux/acpi.h>
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#include <trace/events/power.h>
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#include <asm/div64.h>
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@@ -779,6 +780,72 @@ static void copy_cpu_funcs(struct pstate_funcs *funcs)
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pstate_funcs.set = funcs->set;
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}
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+#if IS_ENABLED(CONFIG_ACPI)
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+#include <acpi/processor.h>
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+
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+static bool intel_pstate_no_acpi_pss(void)
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+{
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+ int i;
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+
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+ for_each_possible_cpu(i) {
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+ acpi_status status;
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+ union acpi_object *pss;
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+ struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
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+ struct acpi_processor *pr = per_cpu(processors, i);
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+
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+ if (!pr)
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+ continue;
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+
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+ status = acpi_evaluate_object(pr->handle, "_PSS", NULL, &buffer);
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+ if (ACPI_FAILURE(status))
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+ continue;
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+
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+ pss = buffer.pointer;
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+ if (pss && pss->type == ACPI_TYPE_PACKAGE) {
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+ kfree(pss);
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+ return false;
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+ }
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+
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+ kfree(pss);
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+ }
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+
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+ return true;
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+}
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+
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+struct hw_vendor_info {
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+ u16 valid;
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+ char oem_id[ACPI_OEM_ID_SIZE];
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+ char oem_table_id[ACPI_OEM_TABLE_ID_SIZE];
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+};
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+
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+/* Hardware vendor-specific info that has its own power management modes */
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+static struct hw_vendor_info vendor_info[] = {
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+ {1, "HP ", "ProLiant"},
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+ {0, "", ""},
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+};
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+
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+static bool intel_pstate_platform_pwr_mgmt_exists(void)
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+{
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+ struct acpi_table_header hdr;
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+ struct hw_vendor_info *v_info;
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+
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+ if (acpi_disabled
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+ || ACPI_FAILURE(acpi_get_table_header(ACPI_SIG_FADT, 0, &hdr)))
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+ return false;
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+
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+ for (v_info = vendor_info; v_info->valid; v_info++) {
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+ if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE)
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+ && !strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE)
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+ && intel_pstate_no_acpi_pss())
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+ return true;
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+ }
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+
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+ return false;
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+}
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+#else /* CONFIG_ACPI not enabled */
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+static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
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+#endif /* CONFIG_ACPI */
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+
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static int __init intel_pstate_init(void)
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{
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int cpu, rc = 0;
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@@ -792,6 +859,13 @@ static int __init intel_pstate_init(void)
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if (!id)
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return -ENODEV;
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+ /*
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+ * The Intel pstate driver will be ignored if the platform
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+ * firmware has its own power management modes.
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+ */
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+ if (intel_pstate_platform_pwr_mgmt_exists())
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+ return -ENODEV;
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+
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cpu_info = (struct cpu_defaults *)id->driver_data;
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copy_pid_params(&cpu_info->pid_policy);
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