Merge branch 'tools' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6

* 'tools' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6:
  tools: create power/x86/x86_energy_perf_policy
  tools: create power/x86/turbostat

6 files changed, 1665 insertions, 0 deletions

diff --git a/tools/power/x86/turbostat/Makefile b/tools/power/x86/turbostat/Makefile
new file mode 100644
index 00000000000..fd8e1f1297a
--- /dev/null
+++ b/tools/power/x86/turbostat/Makefile
@@ -0,0 +1,8 @@
+turbostat : turbostat.c
+
+clean :
+        rm -f turbostat
+
+install :
+        install turbostat /usr/bin/turbostat
+        install turbostat.8 /usr/share/man/man8
diff --git a/tools/power/x86/turbostat/turbostat.8 b/tools/power/x86/turbostat/turbostat.8
new file mode 100644
index 00000000000..ff75125deed
--- /dev/null
+++ b/tools/power/x86/turbostat/turbostat.8
@@ -0,0 +1,172 @@
+.TH TURBOSTAT 8
+.SH NAME
+turbostat \- Report processor frequency and idle statistics
+.SH SYNOPSIS
+.ft B
+.B turbostat
+.RB [ "\-v" ]
+.RB [ "\-M MSR#" ]
+.RB command
+.br
+.B turbostat
+.RB [ "\-v" ]
+.RB [ "\-M MSR#" ]
+.RB [ "\-i interval_sec" ]
+.SH DESCRIPTION
+\fBturbostat \fP reports processor topology, frequency
+and idle power state statistics on modern X86 processors.
+Either \fBcommand\fP is forked and statistics are printed
+upon its completion, or statistics are printed periodically.
+
+\fBturbostat \fP
+requires that the processor
+supports an "invariant" TSC, plus the APERF and MPERF MSRs.
+\fBturbostat \fP will report idle cpu power state residency
+on processors that additionally support C-state residency counters.
+
+.SS Options
+The \fB-v\fP option increases verbosity.
+.PP
+The \fB-M MSR#\fP option dumps the specified MSR,
+in addition to the usual frequency and idle statistics.
+.PP
+The \fB-i interval_sec\fP option prints statistics every \fiinterval_sec\fP seconds.
+The default is 5 seconds.
+.PP
+The \fBcommand\fP parameter forks \fBcommand\fP and upon its exit,
+displays the statistics gathered since it was forked.
+.PP
+.SH FIELD DESCRIPTIONS
+.nf
+\fBpkg\fP processor package number.
+\fBcore\fP processor core number.
+\fBCPU\fP Linux CPU (logical processor) number.
+\fB%c0\fP percent of the interval that the CPU retired instructions.
+\fBGHz\fP average clock rate while the CPU was in c0 state.
+\fBTSC\fP average GHz that the TSC ran during the entire interval.
+\fB%c1, %c3, %c6\fP show the percentage residency in hardware core idle states.
+\fB%pc3, %pc6\fP percentage residency in hardware package idle states.
+.fi
+.PP
+.SH EXAMPLE
+Without any parameters, turbostat prints out counters ever 5 seconds.
+(override interval with "-i sec" option, or specify a command
+for turbostat to fork).
+
+The first row of statistics reflect the average for the entire system.
+Subsequent rows show per-CPU statistics.
+
+.nf
+[root@x980]# ./turbostat
+core CPU   %c0   GHz  TSC   %c1    %c3    %c6   %pc3   %pc6
+          0.04 1.62 3.38   0.11   0.00  99.85   0.00  95.07
+  0   0   0.04 1.62 3.38   0.06   0.00  99.90   0.00  95.07
+  0   6   0.02 1.62 3.38   0.08   0.00  99.90   0.00  95.07
+  1   2   0.10 1.62 3.38   0.29   0.00  99.61   0.00  95.07
+  1   8   0.11 1.62 3.38   0.28   0.00  99.61   0.00  95.07
+  2   4   0.01 1.62 3.38   0.01   0.00  99.98   0.00  95.07
+  2  10   0.01 1.61 3.38   0.02   0.00  99.98   0.00  95.07
+  8   1   0.07 1.62 3.38   0.15   0.00  99.78   0.00  95.07
+  8   7   0.03 1.62 3.38   0.19   0.00  99.78   0.00  95.07
+  9   3   0.01 1.62 3.38   0.02   0.00  99.98   0.00  95.07
+  9   9   0.01 1.62 3.38   0.02   0.00  99.98   0.00  95.07
+ 10   5   0.01 1.62 3.38   0.13   0.00  99.86   0.00  95.07
+ 10  11   0.08 1.62 3.38   0.05   0.00  99.86   0.00  95.07
+.fi
+.SH VERBOSE EXAMPLE
+The "-v" option adds verbosity to the output:
+
+.nf
+GenuineIntel 11 CPUID levels; family:model:stepping 0x6:2c:2 (6:44:2)
+12 * 133 = 1600 MHz max efficiency
+25 * 133 = 3333 MHz TSC frequency
+26 * 133 = 3467 MHz max turbo 4 active cores
+26 * 133 = 3467 MHz max turbo 3 active cores
+27 * 133 = 3600 MHz max turbo 2 active cores
+27 * 133 = 3600 MHz max turbo 1 active cores
+
+.fi
+The \fBmax efficiency\fP frequency, a.k.a. Low Frequency Mode, is the frequency
+available at the minimum package voltage.  The \fBTSC frequency\fP is the nominal
+maximum frequency of the processor if turbo-mode were not available.  This frequency
+should be sustainable on all CPUs indefinitely, given nominal power and cooling.
+The remaining rows show what maximum turbo frequency is possible
+depending on the number of idle cores.  Note that this information is
+not available on all processors.
+.SH FORK EXAMPLE
+If turbostat is invoked with a command, it will fork that command
+and output the statistics gathered when the command exits.
+eg. Here a cycle soaker is run on 1 CPU (see %c0) for a few seconds
+until ^C while the other CPUs are mostly idle:
+
+.nf
+[root@x980 lenb]# ./turbostat cat /dev/zero > /dev/null
+
+^Ccore CPU   %c0   GHz  TSC   %c1    %c3    %c6   %pc3   %pc6
+           8.49 3.63 3.38  16.23   0.66  74.63   0.00   0.00
+   0   0   1.22 3.62 3.38  32.18   0.00  66.60   0.00   0.00
+   0   6   0.40 3.61 3.38  33.00   0.00  66.60   0.00   0.00
+   1   2   0.11 3.14 3.38   0.19   3.95  95.75   0.00   0.00
+   1   8   0.05 2.88 3.38   0.25   3.95  95.75   0.00   0.00
+   2   4   0.00 3.13 3.38   0.02   0.00  99.98   0.00   0.00
+   2  10   0.00 3.09 3.38   0.02   0.00  99.98   0.00   0.00
+   8   1   0.04 3.50 3.38  14.43   0.00  85.54   0.00   0.00
+   8   7   0.03 2.98 3.38  14.43   0.00  85.54   0.00   0.00
+   9   3   0.00 3.16 3.38 100.00   0.00   0.00   0.00   0.00
+   9   9  99.93 3.63 3.38   0.06   0.00   0.00   0.00   0.00
+  10   5   0.01 2.82 3.38   0.08   0.00  99.91   0.00   0.00
+  10  11   0.02 3.36 3.38   0.06   0.00  99.91   0.00   0.00
+6.950866 sec
+
+.fi
+Above the cycle soaker drives cpu9 up 3.6 Ghz turbo limit
+while the other processors are generally in various states of idle.
+
+Note that cpu3 is an HT sibling sharing core9
+with cpu9, and thus it is unable to get to an idle state
+deeper than c1 while cpu9 is busy.
+
+Note that turbostat reports average GHz of 3.61, while
+the arithmetic average of the GHz column above is 3.24.
+This is a weighted average, where the weight is %c0.  ie. it is the total number of
+un-halted cycles elapsed per time divided by the number of CPUs.
+.SH NOTES
+
+.B "turbostat "
+must be run as root.
+
+.B "turbostat "
+reads hardware counters, but doesn't write them.
+So it will not interfere with the OS or other programs, including
+multiple invocations of itself.
+
+\fBturbostat \fP
+may work poorly on Linux-2.6.20 through 2.6.29,
+as \fBacpi-cpufreq \fPperiodically cleared the APERF and MPERF
+in those kernels.
+
+The APERF, MPERF MSRs are defined to count non-halted cycles.
+Although it is not guaranteed by the architecture, turbostat assumes
+that they count at TSC rate, which is true on all processors tested to date.
+
+.SH REFERENCES
+"Intel® Turbo Boost Technology
+in Intel® Core™ Microarchitecture (Nehalem) Based Processors"
+http://download.intel.com/design/processor/applnots/320354.pdf
+
+"Intel® 64 and IA-32 Architectures Software Developer's Manual
+Volume 3B: System Programming Guide"
+http://www.intel.com/products/processor/manuals/
+
+.SH FILES
+.ta
+.nf
+/dev/cpu/*/msr
+.fi
+
+.SH "SEE ALSO"
+msr(4), vmstat(8)
+.PP
+.SH AUTHORS
+.nf
+Written by Len Brown <len.brown@intel.com>
diff --git a/tools/power/x86/turbostat/turbostat.c b/tools/power/x86/turbostat/turbostat.c
new file mode 100644
index 00000000000..4c6983de6fd
--- /dev/null
+++ b/tools/power/x86/turbostat/turbostat.c
@@ -0,0 +1,1048 @@
+/*
+ * turbostat -- show CPU frequency and C-state residency
+ * on modern Intel turbo-capable processors.
+ *
+ * Copyright (c) 2010, Intel Corporation.
+ * Len Brown <len.brown@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <string.h>
+#include <ctype.h>
+
+#define MSR_TSC 0x10
+#define MSR_NEHALEM_PLATFORM_INFO       0xCE
+#define MSR_NEHALEM_TURBO_RATIO_LIMIT   0x1AD
+#define MSR_APERF       0xE8
+#define MSR_MPERF       0xE7
+#define MSR_PKG_C2_RESIDENCY    0x60D   /* SNB only */
+#define MSR_PKG_C3_RESIDENCY    0x3F8
+#define MSR_PKG_C6_RESIDENCY    0x3F9
+#define MSR_PKG_C7_RESIDENCY    0x3FA   /* SNB only */
+#define MSR_CORE_C3_RESIDENCY   0x3FC
+#define MSR_CORE_C6_RESIDENCY   0x3FD
+#define MSR_CORE_C7_RESIDENCY   0x3FE   /* SNB only */
+
+char *proc_stat = "/proc/stat";
+unsigned int interval_sec = 5;  /* set with -i interval_sec */
+unsigned int verbose;           /* set with -v */
+unsigned int skip_c0;
+unsigned int skip_c1;
+unsigned int do_nhm_cstates;
+unsigned int do_snb_cstates;
+unsigned int has_aperf;
+unsigned int units = 1000000000;        /* Ghz etc */
+unsigned int genuine_intel;
+unsigned int has_invariant_tsc;
+unsigned int do_nehalem_platform_info;
+unsigned int do_nehalem_turbo_ratio_limit;
+unsigned int extra_msr_offset;
+double bclk;
+unsigned int show_pkg;
+unsigned int show_core;
+unsigned int show_cpu;
+
+int aperf_mperf_unstable;
+int backwards_count;
+char *progname;
+int need_reinitialize;
+
+int num_cpus;
+
+typedef struct per_cpu_counters {
+        unsigned long long tsc;         /* per thread */
+        unsigned long long aperf;       /* per thread */
+        unsigned long long mperf;       /* per thread */
+        unsigned long long c1;  /* per thread (calculated) */
+        unsigned long long c3;  /* per core */
+        unsigned long long c6;  /* per core */
+        unsigned long long c7;  /* per core */
+        unsigned long long pc2; /* per package */
+        unsigned long long pc3; /* per package */
+        unsigned long long pc6; /* per package */
+        unsigned long long pc7; /* per package */
+        unsigned long long extra_msr;   /* per thread */
+        int pkg;
+        int core;
+        int cpu;
+        struct per_cpu_counters *next;
+} PCC;
+
+PCC *pcc_even;
+PCC *pcc_odd;
+PCC *pcc_delta;
+PCC *pcc_average;
+struct timeval tv_even;
+struct timeval tv_odd;
+struct timeval tv_delta;
+
+unsigned long long get_msr(int cpu, off_t offset)
+{
+        ssize_t retval;
+        unsigned long long msr;
+        char pathname[32];
+        int fd;
+
+        sprintf(pathname, "/dev/cpu/%d/msr", cpu);
+        fd = open(pathname, O_RDONLY);
+        if (fd < 0) {
+                perror(pathname);
+                need_reinitialize = 1;
+                return 0;
+        }
+
+        retval = pread(fd, &msr, sizeof msr, offset);
+        if (retval != sizeof msr) {
+                fprintf(stderr, "cpu%d pread(..., 0x%zx) = %jd\n",
+                        cpu, offset, retval);
+                exit(-2);
+        }
+
+        close(fd);
+        return msr;
+}
+
+void print_header()
+{
+        if (show_pkg)
+                fprintf(stderr, "pkg ");
+        if (show_core)
+                fprintf(stderr, "core");
+        if (show_cpu)
+                fprintf(stderr, " CPU");
+        if (do_nhm_cstates)
+                fprintf(stderr, "   %%c0 ");
+        if (has_aperf)
+                fprintf(stderr, "  GHz");
+        fprintf(stderr, "  TSC");
+        if (do_nhm_cstates)
+                fprintf(stderr, "   %%c1 ");
+        if (do_nhm_cstates)
+                fprintf(stderr, "   %%c3 ");
+        if (do_nhm_cstates)
+                fprintf(stderr, "   %%c6 ");
+        if (do_snb_cstates)
+                fprintf(stderr, "   %%c7 ");
+        if (do_snb_cstates)
+                fprintf(stderr, "  %%pc2 ");
+        if (do_nhm_cstates)
+                fprintf(stderr, "  %%pc3 ");
+        if (do_nhm_cstates)
+                fprintf(stderr, "  %%pc6 ");
+        if (do_snb_cstates)
+                fprintf(stderr, "  %%pc7 ");
+        if (extra_msr_offset)
+                fprintf(stderr, "       MSR 0x%x ", extra_msr_offset);
+
+        putc('\n', stderr);
+}
+
+void dump_pcc(PCC *pcc)
+{
+        fprintf(stderr, "package: %d ", pcc->pkg);
+        fprintf(stderr, "core:: %d ", pcc->core);
+        fprintf(stderr, "CPU: %d ", pcc->cpu);
+        fprintf(stderr, "TSC: %016llX\n", pcc->tsc);
+        fprintf(stderr, "c3: %016llX\n", pcc->c3);
+        fprintf(stderr, "c6: %016llX\n", pcc->c6);
+        fprintf(stderr, "c7: %016llX\n", pcc->c7);
+        fprintf(stderr, "aperf: %016llX\n", pcc->aperf);
+        fprintf(stderr, "pc2: %016llX\n", pcc->pc2);
+        fprintf(stderr, "pc3: %016llX\n", pcc->pc3);
+        fprintf(stderr, "pc6: %016llX\n", pcc->pc6);
+        fprintf(stderr, "pc7: %016llX\n", pcc->pc7);
+        fprintf(stderr, "msr0x%x: %016llX\n", extra_msr_offset, pcc->extra_msr);
+}
+
+void dump_list(PCC *pcc)
+{
+        printf("dump_list 0x%p\n", pcc);
+
+        for (; pcc; pcc = pcc->next)
+                dump_pcc(pcc);
+}
+
+void print_pcc(PCC *p)
+{
+        double interval_float;
+
+        interval_float = tv_delta.tv_sec + tv_delta.tv_usec/1000000.0;
+
+        /* topology columns, print blanks on 1st (average) line */
+        if (p == pcc_average) {
+                if (show_pkg)
+                        fprintf(stderr, "    ");
+                if (show_core)
+                        fprintf(stderr, "    ");
+                if (show_cpu)
+                        fprintf(stderr, "    ");
+        } else {
+                if (show_pkg)
+                        fprintf(stderr, "%4d", p->pkg);
+                if (show_core)
+                        fprintf(stderr, "%4d", p->core);
+                if (show_cpu)
+                        fprintf(stderr, "%4d", p->cpu);
+        }
+
+        /* %c0 */
+        if (do_nhm_cstates) {
+                if (!skip_c0)
+                        fprintf(stderr, "%7.2f", 100.0 * p->mperf/p->tsc);
+                else
+                        fprintf(stderr, "   ****");
+        }
+
+        /* GHz */
+        if (has_aperf) {
+                if (!aperf_mperf_unstable) {
+                        fprintf(stderr, "%5.2f",
+                                1.0 * p->tsc / units * p->aperf /
+                                p->mperf / interval_float);
+                } else {
+                        if (p->aperf > p->tsc || p->mperf > p->tsc) {
+                                fprintf(stderr, " ****");
+                        } else {
+                                fprintf(stderr, "%4.1f*",
+                                        1.0 * p->tsc /
+                                        units * p->aperf /
+                                        p->mperf / interval_float);
+                        }
+                }
+        }
+
+        /* TSC */
+        fprintf(stderr, "%5.2f", 1.0 * p->tsc/units/interval_float);
+
+        if (do_nhm_cstates) {
+                if (!skip_c1)
+                        fprintf(stderr, "%7.2f", 100.0 * p->c1/p->tsc);
+                else
+                        fprintf(stderr, "   ****");
+        }
+        if (do_nhm_cstates)
+                fprintf(stderr, "%7.2f", 100.0 * p->c3/p->tsc);
+        if (do_nhm_cstates)
+                fprintf(stderr, "%7.2f", 100.0 * p->c6/p->tsc);
+        if (do_snb_cstates)
+                fprintf(stderr, "%7.2f", 100.0 * p->c7/p->tsc);
+        if (do_snb_cstates)
+                fprintf(stderr, "%7.2f", 100.0 * p->pc2/p->tsc);
+        if (do_nhm_cstates)
+                fprintf(stderr, "%7.2f", 100.0 * p->pc3/p->tsc);
+        if (do_nhm_cstates)
+                fprintf(stderr, "%7.2f", 100.0 * p->pc6/p->tsc);
+        if (do_snb_cstates)
+                fprintf(stderr, "%7.2f", 100.0 * p->pc7/p->tsc);
+        if (extra_msr_offset)
+                fprintf(stderr, "  0x%016llx", p->extra_msr);
+        putc('\n', stderr);
+}
+
+void print_counters(PCC *cnt)
+{
+        PCC *pcc;
+
+        print_header();
+
+        if (num_cpus > 1)
+                print_pcc(pcc_average);
+
+        for (pcc = cnt; pcc != NULL; pcc = pcc->next)
+                print_pcc(pcc);
+
+}
+
+#define SUBTRACT_COUNTER(after, before, delta) (delta = (after - before), (before > after))
+
+
+int compute_delta(PCC *after, PCC *before, PCC *delta)
+{
+        int errors = 0;
+        int perf_err = 0;
+
+        skip_c0 = skip_c1 = 0;
+
+        for ( ; after && before && delta;
+                after = after->next, before = before->next, delta = delta->next) {
+                if (before->cpu != after->cpu) {
+                        printf("cpu configuration changed: %d != %d\n",
+                                before->cpu, after->cpu);
+                        return -1;
+                }
+
+                if (SUBTRACT_COUNTER(after->tsc, before->tsc, delta->tsc)) {
+                        fprintf(stderr, "cpu%d TSC went backwards %llX to %llX\n",
+                                before->cpu, before->tsc, after->tsc);
+                        errors++;
+                }
+                /* check for TSC < 1 Mcycles over interval */
+                if (delta->tsc < (1000 * 1000)) {
+                        fprintf(stderr, "Insanely slow TSC rate,"
+                                " TSC stops in idle?\n");
+                        fprintf(stderr, "You can disable all c-states"
+                                " by booting with \"idle=poll\"\n");
+                        fprintf(stderr, "or just the deep ones with"
+                                " \"processor.max_cstate=1\"\n");
+                        exit(-3);
+                }
+                if (SUBTRACT_COUNTER(after->c3, before->c3, delta->c3)) {
+                        fprintf(stderr, "cpu%d c3 counter went backwards %llX to %llX\n",
+                                before->cpu, before->c3, after->c3);
+                        errors++;
+                }
+                if (SUBTRACT_COUNTER(after->c6, before->c6, delta->c6)) {
+                        fprintf(stderr, "cpu%d c6 counter went backwards %llX to %llX\n",
+                                before->cpu, before->c6, after->c6);
+                        errors++;
+                }
+                if (SUBTRACT_COUNTER(after->c7, before->c7, delta->c7)) {
+                        fprintf(stderr, "cpu%d c7 counter went backwards %llX to %llX\n",
+                                before->cpu, before->c7, after->c7);
+                        errors++;
+                }
+                if (SUBTRACT_COUNTER(after->pc2, before->pc2, delta->pc2)) {
+                        fprintf(stderr, "cpu%d pc2 counter went backwards %llX to %llX\n",
+                                before->cpu, before->pc2, after->pc2);
+                        errors++;
+                }
+                if (SUBTRACT_COUNTER(after->pc3, before->pc3, delta->pc3)) {
+                        fprintf(stderr, "cpu%d pc3 counter went backwards %llX to %llX\n",
+                                before->cpu, before->pc3, after->pc3);
+                        errors++;
+                }
+                if (SUBTRACT_COUNTER(after->pc6, before->pc6, delta->pc6)) {
+                        fprintf(stderr, "cpu%d pc6 counter went backwards %llX to %llX\n",
+                                before->cpu, before->pc6, after->pc6);
+                        errors++;
+                }
+                if (SUBTRACT_COUNTER(after->pc7, before->pc7, delta->pc7)) {
+                        fprintf(stderr, "cpu%d pc7 counter went backwards %llX to %llX\n",
+                                before->cpu, before->pc7, after->pc7);
+                        errors++;
+                }
+
+                perf_err = SUBTRACT_COUNTER(after->aperf, before->aperf, delta->aperf);
+                if (perf_err) {
+                        fprintf(stderr, "cpu%d aperf counter went backwards %llX to %llX\n",
+                                before->cpu, before->aperf, after->aperf);
+                }
+                perf_err |= SUBTRACT_COUNTER(after->mperf, before->mperf, delta->mperf);
+                if (perf_err) {
+                        fprintf(stderr, "cpu%d mperf counter went backwards %llX to %llX\n",
+                                before->cpu, before->mperf, after->mperf);
+                }
+                if (perf_err) {
+                        if (!aperf_mperf_unstable) {
+                                fprintf(stderr, "%s: APERF or MPERF went backwards *\n", progname);
+                                fprintf(stderr, "* Frequency results do not cover entire interval *\n");
+                                fprintf(stderr, "* fix this by running Linux-2.6.30 or later *\n");
+
+                                aperf_mperf_unstable = 1;
+                        }
+                        /*
+                         * mperf delta is likely a huge "positive" number
+                         * can not use it for calculating c0 time
+                         */
+                        skip_c0 = 1;
+                        skip_c1 = 1;
+                }
+
+                /*
+                 * As mperf and tsc collection are not atomic,
+                 * it is possible for mperf's non-halted cycles
+                 * to exceed TSC's all cycles: show c1 = 0% in that case.
+                 */
+                if (delta->mperf > delta->tsc)
+                        delta->c1 = 0;
+                else /* normal case, derive c1 */
+                        delta->c1 = delta->tsc - delta->mperf
+                                - delta->c3 - delta->c6 - delta->c7;
+
+                if (delta->mperf == 0)
+                        delta->mperf = 1;       /* divide by 0 protection */
+
+                /*
+                 * for "extra msr", just copy the latest w/o subtracting
+                 */
+                delta->extra_msr = after->extra_msr;
+                if (errors) {
+                        fprintf(stderr, "ERROR cpu%d before:\n", before->cpu);
+                        dump_pcc(before);
+                        fprintf(stderr, "ERROR cpu%d after:\n", before->cpu);
+                        dump_pcc(after);
+                        errors = 0;
+                }
+        }
+        return 0;
+}
+
+void compute_average(PCC *delta, PCC *avg)
+{
+        PCC *sum;
+
+        sum = calloc(1, sizeof(PCC));
+        if (sum == NULL) {
+                perror("calloc sum");
+                exit(1);
+        }
+
+        for (; delta; delta = delta->next) {
+                sum->tsc += delta->tsc;
+                sum->c1 += delta->c1;
+                sum->c3 += delta->c3;
+                sum->c6 += delta->c6;
+                sum->c7 += delta->c7;
+                sum->aperf += delta->aperf;
+                sum->mperf += delta->mperf;
+                sum->pc2 += delta->pc2;
+                sum->pc3 += delta->pc3;
+                sum->pc6 += delta->pc6;
+                sum->pc7 += delta->pc7;
+        }
+        avg->tsc = sum->tsc/num_cpus;
+        avg->c1 = sum->c1/num_cpus;
+        avg->c3 = sum->c3/num_cpus;
+        avg->c6 = sum->c6/num_cpus;
+        avg->c7 = sum->c7/num_cpus;
+        avg->aperf = sum->aperf/num_cpus;
+        avg->mperf = sum->mperf/num_cpus;
+        avg->pc2 = sum->pc2/num_cpus;
+        avg->pc3 = sum->pc3/num_cpus;
+        avg->pc6 = sum->pc6/num_cpus;
+        avg->pc7 = sum->pc7/num_cpus;
+
+        free(sum);
+}
+
+void get_counters(PCC *pcc)
+{
+        for ( ; pcc; pcc = pcc->next) {
+                pcc->tsc = get_msr(pcc->cpu, MSR_TSC);
+                if (do_nhm_cstates)
+                        pcc->c3 = get_msr(pcc->cpu, MSR_CORE_C3_RESIDENCY);
+                if (do_nhm_cstates)
+                        pcc->c6 = get_msr(pcc->cpu, MSR_CORE_C6_RESIDENCY);
+                if (do_snb_cstates)
+                        pcc->c7 = get_msr(pcc->cpu, MSR_CORE_C7_RESIDENCY);
+                if (has_aperf)
+                        pcc->aperf = get_msr(pcc->cpu, MSR_APERF);
+                if (has_aperf)
+                        pcc->mperf = get_msr(pcc->cpu, MSR_MPERF);
+                if (do_snb_cstates)
+                        pcc->pc2 = get_msr(pcc->cpu, MSR_PKG_C2_RESIDENCY);
+                if (do_nhm_cstates)
+                        pcc->pc3 = get_msr(pcc->cpu, MSR_PKG_C3_RESIDENCY);
+                if (do_nhm_cstates)
+                        pcc->pc6 = get_msr(pcc->cpu, MSR_PKG_C6_RESIDENCY);
+                if (do_snb_cstates)
+                        pcc->pc7 = get_msr(pcc->cpu, MSR_PKG_C7_RESIDENCY);
+                if (extra_msr_offset)
+                        pcc->extra_msr = get_msr(pcc->cpu, extra_msr_offset);
+        }
+}
+
+
+void print_nehalem_info()
+{
+        unsigned long long msr;
+        unsigned int ratio;
+
+        if (!do_nehalem_platform_info)
+                return;
+
+        msr = get_msr(0, MSR_NEHALEM_PLATFORM_INFO);
+
+        ratio = (msr >> 40) & 0xFF;
+        fprintf(stderr, "%d * %.0f = %.0f MHz max efficiency\n",
+                ratio, bclk, ratio * bclk);
+
+        ratio = (msr >> 8) & 0xFF;
+        fprintf(stderr, "%d * %.0f = %.0f MHz TSC frequency\n",
+                ratio, bclk, ratio * bclk);
+
+        if (verbose > 1)
+                fprintf(stderr, "MSR_NEHALEM_PLATFORM_INFO: 0x%llx\n", msr);
+
+        if (!do_nehalem_turbo_ratio_limit)
+                return;
+
+        msr = get_msr(0, MSR_NEHALEM_TURBO_RATIO_LIMIT);
+
+        ratio = (msr >> 24) & 0xFF;
+        if (ratio)
+                fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 4 active cores\n",
+                        ratio, bclk, ratio * bclk);
+
+        ratio = (msr >> 16) & 0xFF;
+        if (ratio)
+                fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 3 active cores\n",
+                        ratio, bclk, ratio * bclk);
+
+        ratio = (msr >> 8) & 0xFF;
+        if (ratio)
+                fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 2 active cores\n",
+                        ratio, bclk, ratio * bclk);
+
+        ratio = (msr >> 0) & 0xFF;
+        if (ratio)
+                fprintf(stderr, "%d * %.0f = %.0f MHz max turbo 1 active cores\n",
+                        ratio, bclk, ratio * bclk);
+
+}
+
+void free_counter_list(PCC *list)
+{
+        PCC *p;
+
+        for (p = list; p; ) {
+                PCC *free_me;
+
+                free_me = p;
+                p = p->next;
+                free(free_me);
+        }
+        return;
+}
+
+void free_all_counters(void)
+{
+        free_counter_list(pcc_even);
+        pcc_even = NULL;
+
+        free_counter_list(pcc_odd);
+        pcc_odd = NULL;
+
+        free_counter_list(pcc_delta);
+        pcc_delta = NULL;
+
+        free_counter_list(pcc_average);
+        pcc_average = NULL;
+}
+
+void insert_cpu_counters(PCC **list, PCC *new)
+{
+        PCC *prev;
+
+        /*
+         * list was empty
+         */
+        if (*list == NULL) {
+                new->next = *list;
+                *list = new;
+                return;
+        }
+
+        show_cpu = 1;   /* there is more than one CPU */
+
+        /*
+         * insert on front of list.
+         * It is sorted by ascending package#, core#, cpu#
+         */
+        if (((*list)->pkg > new->pkg) ||
+            (((*list)->pkg == new->pkg) && ((*list)->core > new->core)) ||
+            (((*list)->pkg == new->pkg) && ((*list)->core == new->core) && ((*list)->cpu > new->cpu))) {
+                new->next = *list;
+                *list = new;
+                return;
+        }
+
+        prev = *list;
+
+        while (prev->next && (prev->next->pkg < new->pkg)) {
+                prev = prev->next;
+                show_pkg = 1;   /* there is more than 1 package */
+        }
+
+        while (prev->next && (prev->next->pkg == new->pkg)
+                && (prev->next->core < new->core)) {
+                prev = prev->next;
+                show_core = 1;  /* there is more than 1 core */
+        }
+
+        while (prev->next && (prev->next->pkg == new->pkg)
+                && (prev->next->core == new->core)
+                && (prev->next->cpu < new->cpu)) {
+                prev = prev->next;
+        }
+
+        /*
+         * insert after "prev"
+         */
+        new->next = prev->next;
+        prev->next = new;
+
+        return;
+}
+
+void alloc_new_cpu_counters(int pkg, int core, int cpu)
+{
+        PCC *new;
+
+        if (verbose > 1)
+                printf("pkg%d core%d, cpu%d\n", pkg, core, cpu);
+
+        new = (PCC *)calloc(1, sizeof(PCC));
+        if (new == NULL) {
+                perror("calloc");
+                exit(1);
+        }
+        new->pkg = pkg;
+        new->core = core;
+        new->cpu = cpu;
+        insert_cpu_counters(&pcc_odd, new);
+
+        new = (PCC *)calloc(1, sizeof(PCC));
+        if (new == NULL) {
+                perror("calloc");
+                exit(1);
+        }
+        new->pkg = pkg;
+        new->core = core;
+        new->cpu = cpu;
+        insert_cpu_counters(&pcc_even, new);
+
+        new = (PCC *)calloc(1, sizeof(PCC));
+        if (new == NULL) {
+                perror("calloc");
+                exit(1);
+        }
+        new->pkg = pkg;
+        new->core = core;
+        new->cpu = cpu;
+        insert_cpu_counters(&pcc_delta, new);
+
+        new = (PCC *)calloc(1, sizeof(PCC));
+        if (new == NULL) {
+                perror("calloc");
+                exit(1);
+        }
+        new->pkg = pkg;
+        new->core = core;
+        new->cpu = cpu;
+        pcc_average = new;
+}
+
+int get_physical_package_id(int cpu)
+{
+        char path[64];
+        FILE *filep;
+        int pkg;
+
+        sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/physical_package_id", cpu);
+        filep = fopen(path, "r");
+        if (filep == NULL) {
+                perror(path);
+                exit(1);
+        }
+        fscanf(filep, "%d", &pkg);
+        fclose(filep);
+        return pkg;
+}
+
+int get_core_id(int cpu)
+{
+        char path[64];
+        FILE *filep;
+        int core;
+
+        sprintf(path, "/sys/devices/system/cpu/cpu%d/topology/core_id", cpu);
+        filep = fopen(path, "r");
+        if (filep == NULL) {
+                perror(path);
+                exit(1);
+        }
+        fscanf(filep, "%d", &core);
+        fclose(filep);
+        return core;
+}
+
+/*
+ * run func(index, cpu) on every cpu in /proc/stat
+ */
+
+int for_all_cpus(void (func)(int, int, int))
+{
+        FILE *fp;
+        int cpu_count;
+        int retval;
+
+        fp = fopen(proc_stat, "r");
+        if (fp == NULL) {
+                perror(proc_stat);
+                exit(1);
+        }
+
+        retval = fscanf(fp, "cpu %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n");
+        if (retval != 0) {
+                perror("/proc/stat format");
+                exit(1);
+        }
+
+        for (cpu_count = 0; ; cpu_count++) {
+                int cpu;
+
+                retval = fscanf(fp, "cpu%u %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n", &cpu);
+                if (retval != 1)
+                        break;
+
+                func(get_physical_package_id(cpu), get_core_id(cpu), cpu);
+        }
+        fclose(fp);
+        return cpu_count;
+}
+
+void re_initialize(void)
+{
+        printf("turbostat: topology changed, re-initializing.\n");
+        free_all_counters();
+        num_cpus = for_all_cpus(alloc_new_cpu_counters);
+        need_reinitialize = 0;
+        printf("num_cpus is now %d\n", num_cpus);
+}
+
+void dummy(int pkg, int core, int cpu) { return; }
+/*
+ * check to see if a cpu came on-line
+ */
+void verify_num_cpus()
+{
+        int new_num_cpus;
+
+        new_num_cpus = for_all_cpus(dummy);
+
+        if (new_num_cpus != num_cpus) {
+                if (verbose)
+                        printf("num_cpus was %d, is now  %d\n",
+                                num_cpus, new_num_cpus);
+                need_reinitialize = 1;
+        }
+
+        return;
+}
+
+void turbostat_loop()
+{
+restart:
+        get_counters(pcc_even);
+        gettimeofday(&tv_even, (struct timezone *)NULL);
+
+        while (1) {
+                verify_num_cpus();
+                if (need_reinitialize) {
+                        re_initialize();
+                        goto restart;
+                }
+                sleep(interval_sec);
+                get_counters(pcc_odd);
+                gettimeofday(&tv_odd, (struct timezone *)NULL);
+
+                compute_delta(pcc_odd, pcc_even, pcc_delta);
+                timersub(&tv_odd, &tv_even, &tv_delta);
+                compute_average(pcc_delta, pcc_average);
+                print_counters(pcc_delta);
+                if (need_reinitialize) {
+                        re_initialize();
+                        goto restart;
+                }
+                sleep(interval_sec);
+                get_counters(pcc_even);
+                gettimeofday(&tv_even, (struct timezone *)NULL);
+                compute_delta(pcc_even, pcc_odd, pcc_delta);
+                timersub(&tv_even, &tv_odd, &tv_delta);
+                compute_average(pcc_delta, pcc_average);
+                print_counters(pcc_delta);
+        }
+}
+
+void check_dev_msr()
+{
+        struct stat sb;
+
+        if (stat("/dev/cpu/0/msr", &sb)) {
+                fprintf(stderr, "no /dev/cpu/0/msr\n");
+                fprintf(stderr, "Try \"# modprobe msr\"\n");
+                exit(-5);
+        }
+}
+
+void check_super_user()
+{
+        if (getuid() != 0) {
+                fprintf(stderr, "must be root\n");
+                exit(-6);
+        }
+}
+
+int has_nehalem_turbo_ratio_limit(unsigned int family, unsigned int model)
+{
+        if (!genuine_intel)
+                return 0;
+
+        if (family != 6)
+                return 0;
+
+        switch (model) {
+        case 0x1A:      /* Core i7, Xeon 5500 series - Bloomfield, Gainstown NHM-EP */
+        case 0x1E:      /* Core i7 and i5 Processor - Clarksfield, Lynnfield, Jasper Forest */
+        case 0x1F:      /* Core i7 and i5 Processor - Nehalem */
+        case 0x25:      /* Westmere Client - Clarkdale, Arrandale */
+        case 0x2C:      /* Westmere EP - Gulftown */
+        case 0x2A:      /* SNB */
+        case 0x2D:      /* SNB Xeon */
+                return 1;
+        case 0x2E:      /* Nehalem-EX Xeon - Beckton */
+        case 0x2F:      /* Westmere-EX Xeon - Eagleton */
+        default:
+                return 0;
+        }
+}
+
+int is_snb(unsigned int family, unsigned int model)
+{
+        if (!genuine_intel)
+                return 0;
+
+        switch (model) {
+        case 0x2A:
+        case 0x2D:
+                return 1;
+        }
+        return 0;
+}
+
+double discover_bclk(unsigned int family, unsigned int model)
+{
+        if (is_snb(family, model))
+                return 100.00;
+        else
+                return 133.33;
+}
+
+void check_cpuid()
+{
+        unsigned int eax, ebx, ecx, edx, max_level;
+        unsigned int fms, family, model, stepping;
+
+        eax = ebx = ecx = edx = 0;
+
+        asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0));
+
+        if (ebx == 0x756e6547 && edx == 0x49656e69 && ecx == 0x6c65746e)
+                genuine_intel = 1;
+
+        if (verbose)
+                fprintf(stderr, "%.4s%.4s%.4s ",
+                        (char *)&ebx, (char *)&edx, (char *)&ecx);
+
+        asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx");
+        family = (fms >> 8) & 0xf;
+        model = (fms >> 4) & 0xf;
+        stepping = fms & 0xf;
+        if (family == 6 || family == 0xf)
+                model += ((fms >> 16) & 0xf) << 4;
+
+        if (verbose)
+                fprintf(stderr, "%d CPUID levels; family:model:stepping 0x%x:%x:%x (%d:%d:%d)\n",
+                        max_level, family, model, stepping, family, model, stepping);
+
+        if (!(edx & (1 << 5))) {
+                fprintf(stderr, "CPUID: no MSR\n");
+                exit(1);
+        }
+
+        /*
+         * check max extended function levels of CPUID.
+         * This is needed to check for invariant TSC.
+         * This check is valid for both Intel and AMD.
+         */
+        ebx = ecx = edx = 0;
+        asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000000));
+
+        if (max_level < 0x80000007) {
+                fprintf(stderr, "CPUID: no invariant TSC (max_level 0x%x)\n", max_level);
+                exit(1);
+        }
+
+        /*
+         * Non-Stop TSC is advertised by CPUID.EAX=0x80000007: EDX.bit8
+         * this check is valid for both Intel and AMD
+         */
+        asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x80000007));
+        has_invariant_tsc = edx && (1 << 8);
+
+        if (!has_invariant_tsc) {
+                fprintf(stderr, "No invariant TSC\n");
+                exit(1);
+        }
+
+        /*
+         * APERF/MPERF is advertised by CPUID.EAX=0x6: ECX.bit0
+         * this check is valid for both Intel and AMD
+         */
+
+        asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (0x6));
+        has_aperf = ecx && (1 << 0);
+        if (!has_aperf) {
+                fprintf(stderr, "No APERF MSR\n");
+                exit(1);
+        }
+
+        do_nehalem_platform_info = genuine_intel && has_invariant_tsc;
+        do_nhm_cstates = genuine_intel; /* all Intel w/ non-stop TSC have NHM counters */
+        do_snb_cstates = is_snb(family, model);
+        bclk = discover_bclk(family, model);
+
+        do_nehalem_turbo_ratio_limit = has_nehalem_turbo_ratio_limit(family, model);
+}
+
+
+void usage()
+{
+        fprintf(stderr, "%s: [-v] [-M MSR#] [-i interval_sec | command ...]\n",
+                progname);
+        exit(1);
+}
+
+
+/*
+ * in /dev/cpu/ return success for names that are numbers
+ * ie. filter out ".", "..", "microcode".
+ */
+int dir_filter(const struct dirent *dirp)
+{
+        if (isdigit(dirp->d_name[0]))
+                return 1;
+        else
+                return 0;
+}
+
+int open_dev_cpu_msr(int dummy1)
+{
+        return 0;
+}
+
+void turbostat_init()
+{
+        check_cpuid();
+
+        check_dev_msr();
+        check_super_user();
+
+        num_cpus = for_all_cpus(alloc_new_cpu_counters);
+
+        if (verbose)
+                print_nehalem_info();
+}
+
+int fork_it(char **argv)
+{
+        int retval;
+        pid_t child_pid;
+        get_counters(pcc_even);
+        gettimeofday(&tv_even, (struct timezone *)NULL);
+
+        child_pid = fork();
+        if (!child_pid) {
+                /* child */
+                execvp(argv[0], argv);
+        } else {
+                int status;
+
+                /* parent */
+                if (child_pid == -1) {
+                        perror("fork");
+                        exit(1);
+                }
+
+                signal(SIGINT, SIG_IGN);
+                signal(SIGQUIT, SIG_IGN);
+                if (waitpid(child_pid, &status, 0) == -1) {
+                        perror("wait");
+                        exit(1);
+                }
+        }
+        get_counters(pcc_odd);
+        gettimeofday(&tv_odd, (struct timezone *)NULL);
+        retval = compute_delta(pcc_odd, pcc_even, pcc_delta);
+
+        timersub(&tv_odd, &tv_even, &tv_delta);
+        compute_average(pcc_delta, pcc_average);
+        if (!retval)
+                print_counters(pcc_delta);
+
+        fprintf(stderr, "%.6f sec\n", tv_delta.tv_sec + tv_delta.tv_usec/1000000.0);;
+
+        return 0;
+}
+
+void cmdline(int argc, char **argv)
+{
+        int opt;
+
+        progname = argv[0];
+
+        while ((opt = getopt(argc, argv, "+vi:M:")) != -1) {
+                switch (opt) {
+                case 'v':
+                        verbose++;
+                        break;
+                case 'i':
+                        interval_sec = atoi(optarg);
+                        break;
+                case 'M':
+                        sscanf(optarg, "%x", &extra_msr_offset);
+                        if (verbose > 1)
+                                fprintf(stderr, "MSR 0x%X\n", extra_msr_offset);
+                        break;
+                default:
+                        usage();
+                }
+        }
+}
+
+int main(int argc, char **argv)
+{
+        cmdline(argc, argv);
+
+        if (verbose > 1)
+                fprintf(stderr, "turbostat Dec 6, 2010"
+                        " - Len Brown <lenb@kernel.org>\n");
+        if (verbose > 1)
+                fprintf(stderr, "http://userweb.kernel.org/~lenb/acpi/utils/pmtools/turbostat/\n");
+
+        turbostat_init();
+
+        /*
+         * if any params left, it must be a command to fork
+         */
+        if (argc - optind)
+                return fork_it(argv + optind);
+        else
+                turbostat_loop();
+
+        return 0;
+}
diff --git a/tools/power/x86/x86_energy_perf_policy/Makefile b/tools/power/x86/x86_energy_perf_policy/Makefile
new file mode 100644
index 00000000000..f458237fdd7
--- /dev/null
+++ b/tools/power/x86/x86_energy_perf_policy/Makefile
@@ -0,0 +1,8 @@
+x86_energy_perf_policy : x86_energy_perf_policy.c
+
+clean :
+        rm -f x86_energy_perf_policy
+
+install :
+        install x86_energy_perf_policy /usr/bin/
+        install x86_energy_perf_policy.8 /usr/share/man/man8/
diff --git a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8 b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8
new file mode 100644
index 00000000000..8eaaad648cd
--- /dev/null
+++ b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.8
@@ -0,0 +1,104 @@
+.\"  This page Copyright (C) 2010 Len Brown <len.brown@intel.com>
+.\"  Distributed under the GPL, Copyleft 1994.
+.TH X86_ENERGY_PERF_POLICY 8
+.SH NAME
+x86_energy_perf_policy \- read or write MSR_IA32_ENERGY_PERF_BIAS
+.SH SYNOPSIS
+.ft B
+.B x86_energy_perf_policy
+.RB [ "\-c cpu" ]
+.RB [ "\-v" ]
+.RB "\-r"
+.br
+.B x86_energy_perf_policy
+.RB [ "\-c cpu" ]
+.RB [ "\-v" ]
+.RB 'performance'
+.br
+.B x86_energy_perf_policy
+.RB [ "\-c cpu" ]
+.RB [ "\-v" ]
+.RB 'normal'
+.br
+.B x86_energy_perf_policy
+.RB [ "\-c cpu" ]
+.RB [ "\-v" ]
+.RB 'powersave'
+.br
+.B x86_energy_perf_policy
+.RB [ "\-c cpu" ]
+.RB [ "\-v" ]
+.RB n
+.br
+.SH DESCRIPTION
+\fBx86_energy_perf_policy\fP
+allows software to convey
+its policy for the relative importance of performance
+versus energy savings to the processor.
+
+The processor uses this information in model-specific ways
+when it must select trade-offs between performance and
+energy efficiency.
+
+This policy hint does not supersede Processor Performance states
+(P-states) or CPU Idle power states (C-states), but allows
+software to have influence where it would otherwise be unable
+to express a preference.
+
+For example, this setting may tell the hardware how
+aggressively or conservatively to control frequency
+in the "turbo range" above the explicitly OS-controlled
+P-state frequency range.  It may also tell the hardware
+how aggressively is should enter the OS requested C-states.
+
+Support for this feature is indicated by CPUID.06H.ECX.bit3
+per the Intel Architectures Software Developer's Manual.
+
+.SS Options
+\fB-c\fP limits operation to a single CPU.
+The default is to operate on all CPUs.
+Note that MSR_IA32_ENERGY_PERF_BIAS is defined per
+logical processor, but that the initial implementations
+of the MSR were shared among all processors in each package.
+.PP
+\fB-v\fP increases verbosity.  By default
+x86_energy_perf_policy is silent.
+.PP
+\fB-r\fP is for "read-only" mode - the unchanged state
+is read and displayed.
+.PP
+.I performance
+Set a policy where performance is paramount.
+The processor will be unwilling to sacrifice any performance
+for the sake of energy saving. This is the hardware default.
+.PP
+.I normal
+Set a policy with a normal balance between performance and energy efficiency.
+The processor will tolerate minor performance compromise
+for potentially significant energy savings.
+This reasonable default for most desktops and servers.
+.PP
+.I powersave
+Set a policy where the processor can accept
+a measurable performance hit to maximize energy efficiency.
+.PP
+.I n
+Set MSR_IA32_ENERGY_PERF_BIAS to the specified number.
+The range of valid numbers is 0-15, where 0 is maximum
+performance and 15 is maximum energy efficiency.
+
+.SH NOTES
+.B "x86_energy_perf_policy "
+runs only as root.
+.SH FILES
+.ta
+.nf
+/dev/cpu/*/msr
+.fi
+
+.SH "SEE ALSO"
+msr(4)
+.PP
+.SH AUTHORS
+.nf
+Written by Len Brown <len.brown@intel.com>
diff --git a/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
new file mode 100644
index 00000000000..d9678a34dd7
--- /dev/null
+++ b/tools/power/x86/x86_energy_perf_policy/x86_energy_perf_policy.c
@@ -0,0 +1,325 @@
+/*
+ * x86_energy_perf_policy -- set the energy versus performance
+ * policy preference bias on recent X86 processors.
+ */
+/*
+ * Copyright (c) 2010, Intel Corporation.
+ * Len Brown <len.brown@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <sys/time.h>
+#include <stdlib.h>
+#include <string.h>
+
+unsigned int verbose;           /* set with -v */
+unsigned int read_only;         /* set with -r */
+char *progname;
+unsigned long long new_bias;
+int cpu = -1;
+
+/*
+ * Usage:
+ *
+ * -c cpu: limit action to a single CPU (default is all CPUs)
+ * -v: verbose output (can invoke more than once)
+ * -r: read-only, don't change any settings
+ *
+ *  performance
+ *      Performance is paramount.
+ *      Unwilling to sacrafice any performance
+ *      for the sake of energy saving. (hardware default)
+ *
+ *  normal
+ *      Can tolerate minor performance compromise
+ *      for potentially significant energy savings.
+ *      (reasonable default for most desktops and servers)
+ *
+ *  powersave
+ *      Can tolerate significant performance hit
+ *      to maximize energy savings.
+ *
+ * n
+ *      a numerical value to write to the underlying MSR.
+ */
+void usage(void)
+{
+        printf("%s: [-c cpu] [-v] "
+                "(-r | 'performance' | 'normal' | 'powersave' | n)\n",
+                progname);
+        exit(1);
+}
+
+#define MSR_IA32_ENERGY_PERF_BIAS       0x000001b0
+
+#define BIAS_PERFORMANCE                0
+#define BIAS_BALANCE                    6
+#define BIAS_POWERSAVE                  15
+
+void cmdline(int argc, char **argv)
+{
+        int opt;
+
+        progname = argv[0];
+
+        while ((opt = getopt(argc, argv, "+rvc:")) != -1) {
+                switch (opt) {
+                case 'c':
+                        cpu = atoi(optarg);
+                        break;
+                case 'r':
+                        read_only = 1;
+                        break;
+                case 'v':
+                        verbose++;
+                        break;
+                default:
+                        usage();
+                }
+        }
+        /* if -r, then should be no additional optind */
+        if (read_only && (argc > optind))
+                usage();
+
+        /*
+         * if no -r , then must be one additional optind
+         */
+        if (!read_only) {
+
+                if (argc != optind + 1) {
+                        printf("must supply -r or policy param\n");
+                        usage();
+                        }
+
+                if (!strcmp("performance", argv[optind])) {
+                        new_bias = BIAS_PERFORMANCE;
+                } else if (!strcmp("normal", argv[optind])) {
+                        new_bias = BIAS_BALANCE;
+                } else if (!strcmp("powersave", argv[optind])) {
+                        new_bias = BIAS_POWERSAVE;
+                } else {
+                        char *endptr;
+
+                        new_bias = strtoull(argv[optind], &endptr, 0);
+                        if (endptr == argv[optind] ||
+                                new_bias > BIAS_POWERSAVE) {
+                                        fprintf(stderr, "invalid value: %s\n",
+                                                argv[optind]);
+                                usage();
+                        }
+                }
+        }
+}
+
+/*
+ * validate_cpuid()
+ * returns on success, quietly exits on failure (make verbose with -v)
+ */
+void validate_cpuid(void)
+{
+        unsigned int eax, ebx, ecx, edx, max_level;
+        char brand[16];
+        unsigned int fms, family, model, stepping;
+
+        eax = ebx = ecx = edx = 0;
+
+        asm("cpuid" : "=a" (max_level), "=b" (ebx), "=c" (ecx),
+                "=d" (edx) : "a" (0));
+
+        if (ebx != 0x756e6547 || edx != 0x49656e69 || ecx != 0x6c65746e) {
+                if (verbose)
+                        fprintf(stderr, "%.4s%.4s%.4s != GenuineIntel",
+                                (char *)&ebx, (char *)&edx, (char *)&ecx);
+                exit(1);
+        }
+
+        asm("cpuid" : "=a" (fms), "=c" (ecx), "=d" (edx) : "a" (1) : "ebx");
+        family = (fms >> 8) & 0xf;
+        model = (fms >> 4) & 0xf;
+        stepping = fms & 0xf;
+        if (family == 6 || family == 0xf)
+                model += ((fms >> 16) & 0xf) << 4;
+
+        if (verbose > 1)
+                printf("CPUID %s %d levels family:model:stepping "
+                        "0x%x:%x:%x (%d:%d:%d)\n", brand, max_level,
+                        family, model, stepping, family, model, stepping);
+
+        if (!(edx & (1 << 5))) {
+                if (verbose)
+                        printf("CPUID: no MSR\n");
+                exit(1);
+        }
+
+        /*
+         * Support for MSR_IA32_ENERGY_PERF_BIAS
+         * is indicated by CPUID.06H.ECX.bit3
+         */
+        asm("cpuid" : "=a" (eax), "=b" (ebx), "=c" (ecx), "=d" (edx) : "a" (6));
+        if (verbose)
+                printf("CPUID.06H.ECX: 0x%x\n", ecx);
+        if (!(ecx & (1 << 3))) {
+                if (verbose)
+                        printf("CPUID: No MSR_IA32_ENERGY_PERF_BIAS\n");
+                exit(1);
+        }
+        return; /* success */
+}
+
+unsigned long long get_msr(int cpu, int offset)
+{
+        unsigned long long msr;
+        char msr_path[32];
+        int retval;
+        int fd;
+
+        sprintf(msr_path, "/dev/cpu/%d/msr", cpu);
+        fd = open(msr_path, O_RDONLY);
+        if (fd < 0) {
+                printf("Try \"# modprobe msr\"\n");
+                perror(msr_path);
+                exit(1);
+        }
+
+        retval = pread(fd, &msr, sizeof msr, offset);
+
+        if (retval != sizeof msr) {
+                printf("pread cpu%d 0x%x = %d\n", cpu, offset, retval);
+                exit(-2);
+        }
+        close(fd);
+        return msr;
+}
+
+unsigned long long  put_msr(int cpu, unsigned long long new_msr, int offset)
+{
+        unsigned long long old_msr;
+        char msr_path[32];
+        int retval;
+        int fd;
+
+        sprintf(msr_path, "/dev/cpu/%d/msr", cpu);
+        fd = open(msr_path, O_RDWR);
+        if (fd < 0) {
+                perror(msr_path);
+                exit(1);
+        }
+
+        retval = pread(fd, &old_msr, sizeof old_msr, offset);
+        if (retval != sizeof old_msr) {
+                perror("pwrite");
+                printf("pread cpu%d 0x%x = %d\n", cpu, offset, retval);
+                exit(-2);
+        }
+
+        retval = pwrite(fd, &new_msr, sizeof new_msr, offset);
+        if (retval != sizeof new_msr) {
+                perror("pwrite");
+                printf("pwrite cpu%d 0x%x = %d\n", cpu, offset, retval);
+                exit(-2);
+        }
+
+        close(fd);
+
+        return old_msr;
+}
+
+void print_msr(int cpu)
+{
+        printf("cpu%d: 0x%016llx\n",
+                cpu, get_msr(cpu, MSR_IA32_ENERGY_PERF_BIAS));
+}
+
+void update_msr(int cpu)
+{
+        unsigned long long previous_msr;
+
+        previous_msr = put_msr(cpu, new_bias, MSR_IA32_ENERGY_PERF_BIAS);
+
+        if (verbose)
+                printf("cpu%d  msr0x%x 0x%016llx -> 0x%016llx\n",
+                        cpu, MSR_IA32_ENERGY_PERF_BIAS, previous_msr, new_bias);
+
+        return;
+}
+
+char *proc_stat = "/proc/stat";
+/*
+ * run func() on every cpu in /dev/cpu
+ */
+void for_every_cpu(void (func)(int))
+{
+        FILE *fp;
+        int retval;
+
+        fp = fopen(proc_stat, "r");
+        if (fp == NULL) {
+                perror(proc_stat);
+                exit(1);
+        }
+
+        retval = fscanf(fp, "cpu %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n");
+        if (retval != 0) {
+                perror("/proc/stat format");
+                exit(1);
+        }
+
+        while (1) {
+                int cpu;
+
+                retval = fscanf(fp,
+                        "cpu%u %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d\n",
+                        &cpu);
+                if (retval != 1)
+                        return;
+
+                func(cpu);
+        }
+        fclose(fp);
+}
+
+int main(int argc, char **argv)
+{
+        cmdline(argc, argv);
+
+        if (verbose > 1)
+                printf("x86_energy_perf_policy Nov 24, 2010"
+                                " - Len Brown <lenb@kernel.org>\n");
+        if (verbose > 1 && !read_only)
+                printf("new_bias %lld\n", new_bias);
+
+        validate_cpuid();
+
+        if (cpu != -1) {
+                if (read_only)
+                        print_msr(cpu);
+                else
+                        update_msr(cpu);
+        } else {
+                if (read_only)
+                        for_every_cpu(print_msr);
+                else
+                        for_every_cpu(update_msr);
+        }
+
+        return 0;
+}