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-rw-r--r--tools/power/cpupower/utils/helpers/amd.c137
1 files changed, 137 insertions, 0 deletions
diff --git a/tools/power/cpupower/utils/helpers/amd.c b/tools/power/cpupower/utils/helpers/amd.c
new file mode 100644
index 000000000000..5e44e31fc7f9
--- /dev/null
+++ b/tools/power/cpupower/utils/helpers/amd.c
@@ -0,0 +1,137 @@
+#if defined(__i386__) || defined(__x86_64__)
+#include <unistd.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include <pci/pci.h>
+
+#include "helpers/helpers.h"
+
+#define MSR_AMD_PSTATE_STATUS 0xc0010063
+#define MSR_AMD_PSTATE 0xc0010064
+#define MSR_AMD_PSTATE_LIMIT 0xc0010061
+
+union msr_pstate {
+ struct {
+ unsigned fid:6;
+ unsigned did:3;
+ unsigned vid:7;
+ unsigned res1:6;
+ unsigned nbdid:1;
+ unsigned res2:2;
+ unsigned nbvid:7;
+ unsigned iddval:8;
+ unsigned idddiv:2;
+ unsigned res3:21;
+ unsigned en:1;
+ } bits;
+ unsigned long long val;
+};
+
+static int get_did(int family, union msr_pstate pstate)
+{
+ int t;
+
+ if (family == 0x12)
+ t = pstate.val & 0xf;
+ else
+ t = pstate.bits.did;
+
+ return t;
+}
+
+static int get_cof(int family, union msr_pstate pstate)
+{
+ int t;
+ int fid, did;
+
+ did = get_did(family, pstate);
+
+ t = 0x10;
+ fid = pstate.bits.fid;
+ if (family == 0x11)
+ t = 0x8;
+
+ return ((100 * (fid + t)) >> did);
+ }
+
+/* Needs:
+ * cpu -> the cpu that gets evaluated
+ * cpu_family -> The cpu's family (0x10, 0x12,...)
+ * boots_states -> how much boost states the machines support
+ *
+ * Fills up:
+ * pstates -> a pointer to an array of size MAX_HW_PSTATES
+ * must be initialized with zeros.
+ * All available HW pstates (including boost states)
+ * no -> amount of pstates above array got filled up with
+ *
+ * returns zero on success, -1 on failure
+ */
+int decode_pstates(unsigned int cpu, unsigned int cpu_family,
+ int boost_states, unsigned long *pstates, int *no)
+{
+ int i, psmax, pscur;
+ union msr_pstate pstate;
+ unsigned long long val;
+
+ /* Only read out frequencies from HW when CPU might be boostable
+ to keep the code as short and clean as possible.
+ Otherwise frequencies are exported via ACPI tables.
+ */
+ if (cpu_family < 0x10 || cpu_family == 0x14)
+ return -1;
+
+ if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val))
+ return -1;
+
+ psmax = (val >> 4) & 0x7;
+
+ if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val))
+ return -1;
+
+ pscur = val & 0x7;
+
+ pscur += boost_states;
+ psmax += boost_states;
+ for (i=0; i<=psmax; i++) {
+ if (i >= MAX_HW_PSTATES) {
+ fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n",
+ psmax, MAX_HW_PSTATES);
+ return -1;
+ }
+ if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val))
+ return -1;
+ pstates[i] = get_cof(cpu_family, pstate);
+ }
+ *no = i;
+ return 0;
+}
+
+int amd_pci_get_num_boost_states(int *active, int *states)
+{
+ struct pci_access *pci_acc;
+ int vendor_id = 0x1022;
+ int boost_dev_ids[4] = {0x1204, 0x1604, 0x1704, 0};
+ struct pci_dev *device;
+ uint8_t val = 0;
+
+ *active = *states = 0;
+
+ device = pci_acc_init(&pci_acc, vendor_id, boost_dev_ids);
+
+ if (device == NULL)
+ return -ENODEV;
+
+ val = pci_read_byte(device, 0x15c);
+ if (val & 3)
+ *active = 1;
+ else
+ *active = 0;
+ *states = (val >> 2) & 7;
+
+ pci_cleanup(pci_acc);
+ return 0;
+}
+#endif /* defined(__i386__) || defined(__x86_64__) */