cpupower: Add AMD P-State sysfs definition and access helper

Introduce the marco definitions and access helper function for
AMD P-State sysfs interfaces such as each performance goals and frequency
levels in amd helper file. They will be used to read the sysfs attribute
from AMD P-State cpufreq driver for cpupower utilities.

Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c
index 97f2c85..4d45d1b 100644 (file)
--- a/tools/power/cpupower/utils/helpers/amd.c
+++ b/tools/power/cpupower/utils/helpers/amd.c
@@ -8,7 +8,10 @@
 #include <pci/pci.h>
 
 #include "helpers/helpers.h"
+#include "cpufreq.h"
+#include "acpi_cppc.h"
 
+/* ACPI P-States Helper Functions for AMD Processors ***************/
 #define MSR_AMD_PSTATE_STATUS  0xc0010063
 #define MSR_AMD_PSTATE         0xc0010064
 #define MSR_AMD_PSTATE_LIMIT   0xc0010061
@@ -146,4 +149,31 @@ int amd_pci_get_num_boost_states(int *active, int *states)
        pci_cleanup(pci_acc);
        return 0;
 }
+
+/* ACPI P-States Helper Functions for AMD Processors ***************/
+
+/* AMD P-State Helper Functions ************************************/
+enum amd_pstate_value {
+       AMD_PSTATE_HIGHEST_PERF,
+       AMD_PSTATE_MAX_FREQ,
+       AMD_PSTATE_LOWEST_NONLINEAR_FREQ,
+       MAX_AMD_PSTATE_VALUE_READ_FILES,
+};
+
+static const char *amd_pstate_value_files[MAX_AMD_PSTATE_VALUE_READ_FILES] = {
+       [AMD_PSTATE_HIGHEST_PERF] = "amd_pstate_highest_perf",
+       [AMD_PSTATE_MAX_FREQ] = "amd_pstate_max_freq",
+       [AMD_PSTATE_LOWEST_NONLINEAR_FREQ] = "amd_pstate_lowest_nonlinear_freq",
+};
+
+static unsigned long amd_pstate_get_data(unsigned int cpu,
+                                        enum amd_pstate_value value)
+{
+       return cpufreq_get_sysfs_value_from_table(cpu,
+                                                 amd_pstate_value_files,
+                                                 value,
+                                                 MAX_AMD_PSTATE_VALUE_READ_FILES);
+}
+
+/* AMD P-State Helper Functions ************************************/
 #endif /* defined(__i386__) || defined(__x86_64__) */