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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 12/13] xenpm: Add set-cpufreq-hwp subcommand
set-cpufreq-hwp allows setting the Hardware P-State (HWP) parameters.
It can be run on all or just a single cpu. There are presets of
balance, powersave & performance. Those can be further tweaked by
param:val arguments as explained in the usage description.
Parameter names are just checked to the first 3 characters to shorten
typing.
Some options are hardware dependent, and ranges can be found in
get-cpufreq-para.
Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx>
---
v2:
Compare provided parameter name and not just 3 characters.
Use "-" in parameter names
Remove hw_
Replace sscanf with strchr & strtoul.
Remove toplevel error message with lower level ones.
Help text s/127/128/
Help text mention truncation.
Avoid some truncation rounding down by adding 5 before division.
Help test mention default microseconds
Also comment the limit check written to avoid overflow.
---
tools/misc/xenpm.c | 230 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 230 insertions(+)
diff --git a/tools/misc/xenpm.c b/tools/misc/xenpm.c
index 5b28e2f6dd..c66ba7c959 100644
--- a/tools/misc/xenpm.c
+++ b/tools/misc/xenpm.c
@@ -16,6 +16,7 @@
*/
#define MAX_NR_CPU 512
+#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
@@ -67,6 +68,27 @@ void show_help(void)
" set-max-cstate <num>|'unlimited' [<num2>|'unlimited']\n"
" set the C-State limitation
(<num> >= 0) and\n"
" optionally the C-sub-state
limitation (<num2> >= 0)\n"
+ " set-cpufreq-hwp [cpuid] [balance|performance|powersave]
<param:val>*\n"
+ " set Hardware P-State (HWP)
parameters\n"
+ " optionally a preset of one
of\n"
+ "
balance|performance|powersave\n"
+ " an optional list of
param:val arguments\n"
+ " minimum:N lowest ...
highest\n"
+ " maximum:N lowest ...
highest\n"
+ " desired:N lowest ...
highest\n"
+ " Set explicit
performance target.\n"
+ " non-zero disables
auto-HWP mode.\n"
+ " energy-perf:0-255 (or
0-15)\n"
+ "
energy/performance hint\n"
+ " lower - favor
performance\n"
+ " higher - favor
powersave\n"
+ " 128 (or 7) -
balance\n"
+ " act-window:N{,m,u}s range
1us-1270s\n"
+ " window for internal
calculations.\n"
+ " Defaults to us without
units.\n"
+ " Truncates
un-representable values.\n"
+ " 0 lets the hardware
decide.\n"
+ " get-cpufreq-para returns
lowest/highest.\n"
" start [seconds] start collect Cx/Px
statistics,\n"
" output after CTRL-C or
SIGINT or several seconds.\n"
" enable-turbo-mode [cpuid] enable Turbo Mode for
processors that support it.\n"
@@ -1299,6 +1321,213 @@ void disable_turbo_mode(int argc, char *argv[])
errno, strerror(errno));
}
+/*
+ * Parse activity_window:NNN{us,ms,s} and validate range.
+ *
+ * Activity window is a 7bit mantissa (0-127) with a 3bit exponent (0-7) base
+ * 10 in microseconds. So the range is 1 microsecond to 1270 seconds. A value
+ * of 0 lets the hardware autonomously select the window.
+ *
+ * Return 0 on success
+ * -1 on error
+ */
+static int parse_activity_window(xc_set_hwp_para_t *set_hwp, unsigned long u,
+ const char *suffix)
+{
+ unsigned int exponent = 0;
+ unsigned int multiplier = 1;
+
+ if ( suffix && suffix[0] )
+ {
+ if ( strcasecmp(suffix, "s") == 0 )
+ {
+ multiplier = 1000 * 1000;
+ exponent = 6;
+ }
+ else if ( strcasecmp(suffix, "ms") == 0 )
+ {
+ multiplier = 1000;
+ exponent = 3;
+ }
+ else if ( strcasecmp(suffix, "us") == 0 )
+ {
+ multiplier = 1;
+ exponent = 0;
+ }
+ else
+ {
+ fprintf(stderr, "invalid activity window units: \"%s\"\n", suffix);
+
+ return -1;
+ }
+ }
+
+ /* u * multipler > 1270 * 1000 * 1000 transformed to avoid overflow. */
+ if ( u > 1270 * 1000 * 1000 / multiplier )
+ {
+ fprintf(stderr, "activity window is too large\n");
+
+ return -1;
+ }
+
+ /* looking for 7 bits of mantissa and 3 bits of exponent */
+ while ( u > 127 )
+ {
+ u += 5; /* Round up to mitigate truncation rounding down
+ e.g. 128 -> 120 vs 128 -> 130. */
+ u /= 10;
+ exponent += 1;
+ }
+
+ set_hwp->activity_window = (exponent & HWP_ACT_WINDOW_EXPONENT_MASK) <<
+ HWP_ACT_WINDOW_EXPONENT_SHIFT |
+ (u & HWP_ACT_WINDOW_MANTISSA_MASK);
+ set_hwp->set_params |= XEN_SYSCTL_HWP_SET_ACT_WINDOW;
+
+ return 0;
+}
+
+static int parse_hwp_opts(xc_set_hwp_para_t *set_hwp, int *cpuid,
+ int argc, char *argv[])
+{
+ int i = 0;
+
+ if ( argc < 1 ) {
+ fprintf(stderr, "Missing arguments\n");
+ return -1;
+ }
+
+ if ( parse_cpuid_non_fatal(argv[i], cpuid) == 0 )
+ {
+ i++;
+ }
+
+ if ( i == argc ) {
+ fprintf(stderr, "Missing arguments\n");
+ return -1;
+ }
+
+ if ( strcasecmp(argv[i], "powersave") == 0 )
+ {
+ set_hwp->set_params = XEN_SYSCTL_HWP_SET_PRESET_POWERSAVE;
+ i++;
+ }
+ else if ( strcasecmp(argv[i], "performance") == 0 )
+ {
+ set_hwp->set_params = XEN_SYSCTL_HWP_SET_PRESET_PERFORMANCE;
+ i++;
+ }
+ else if ( strcasecmp(argv[i], "balance") == 0 )
+ {
+ set_hwp->set_params = XEN_SYSCTL_HWP_SET_PRESET_BALANCE;
+ i++;
+ }
+
+ for ( ; i < argc; i++)
+ {
+ unsigned long val;
+ char *param = argv[i];
+ char *value;
+ char *suffix;
+ int ret;
+
+ value = strchr(param, ':');
+ if ( value == NULL )
+ {
+ fprintf(stderr, "\"%s\" is an invalid hwp parameter\n", argv[i]);
+ return -1;
+ }
+
+ value[0] = '\0';
+ value++;
+
+ errno = 0;
+ val = strtoul(value, &suffix, 10);
+ if ( (errno && val == ULONG_MAX) || value == suffix )
+ {
+ fprintf(stderr, "Could not parse number \"%s\"\n", value);
+ return -1;
+ }
+
+ if ( strncasecmp(param, "act-window", strlen(param)) == 0 )
+ {
+ ret = parse_activity_window(set_hwp, val, suffix);
+ if (ret)
+ return -1;
+
+ continue;
+ }
+
+ if ( val > 255 )
+ {
+ fprintf(stderr, "\"%s\" value \"%lu\" is out of range\n", param,
+ val);
+ return -1;
+ }
+
+ if ( suffix && suffix[0] )
+ {
+ fprintf(stderr, "Suffix \"%s\" is invalid\n", suffix);
+ return -1;
+ }
+
+ if ( strncasecmp(param, "minimum", MAX(2, strlen(param))) == 0 )
+ {
+ set_hwp->minimum = val;
+ set_hwp->set_params |= XEN_SYSCTL_HWP_SET_MINIMUM;
+ }
+ else if ( strncasecmp(param, "maximum", MAX(2, strlen(param))) == 0 )
+ {
+ set_hwp->maximum = val;
+ set_hwp->set_params |= XEN_SYSCTL_HWP_SET_MAXIMUM;
+ }
+ else if ( strncasecmp(param, "desired", strlen(param)) == 0 )
+ {
+ set_hwp->desired = val;
+ set_hwp->set_params |= XEN_SYSCTL_HWP_SET_DESIRED;
+ }
+ else if ( strncasecmp(param, "energy-perf", strlen(param)) == 0 )
+ {
+ set_hwp->energy_perf = val;
+ set_hwp->set_params |= XEN_SYSCTL_HWP_SET_ENERGY_PERF;
+ }
+ else
+ {
+ fprintf(stderr, "\"%s\" is an invalid parameter\n", param);
+ return -1;
+ }
+ }
+
+ if ( set_hwp->set_params == 0 )
+ {
+ fprintf(stderr, "No parameters set in request\n");
+ return -1;
+ }
+
+ return 0;
+}
+
+static void hwp_set_func(int argc, char *argv[])
+{
+ xc_set_hwp_para_t set_hwp = {};
+ int cpuid = -1;
+ int i = 0;
+
+ if ( parse_hwp_opts(&set_hwp, &cpuid, argc, argv) )
+ exit(EINVAL);
+
+ if ( cpuid != -1 )
+ {
+ i = cpuid;
+ max_cpu_nr = i + 1;
+ }
+
+ for ( ; i < max_cpu_nr; i++ )
+ if ( xc_set_cpufreq_hwp(xc_handle, i, &set_hwp) )
+ fprintf(stderr, "[CPU%d] failed to set hwp params (%d - %s)\n",
+ i, errno, strerror(errno));
+}
+
struct {
const char *name;
void (*function)(int argc, char *argv[]);
@@ -1309,6 +1538,7 @@ struct {
{ "get-cpufreq-average", cpufreq_func },
{ "start", start_gather_func },
{ "get-cpufreq-para", cpufreq_para_func },
+ { "set-cpufreq-hwp", hwp_set_func },
{ "set-scaling-maxfreq", scaling_max_freq_func },
{ "set-scaling-minfreq", scaling_min_freq_func },
{ "set-scaling-governor", scaling_governor_func },
--
2.37.1
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