@@ -25,6 +25,7 @@ intel_panel_fitter
intel_perf_counters
intel_reg
intel_reg_checker
+intel_residency
intel_stepping
intel_watermark
skl_compute_wrpll
@@ -29,6 +29,7 @@ bin_PROGRAMS = \
intel_panel_fitter \
intel_perf_counters \
intel_reg_checker \
+ intel_residency \
intel_stepping \
intel_watermark
new file mode 100644
@@ -0,0 +1,708 @@
+/*
+ * Copyright © 2016 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors: Paulo Zanoni <paulo.r.zanoni@intel.com>
+ *
+ */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <signal.h>
+#include <time.h>
+#include <getopt.h>
+#include "igt.h"
+
+#define IA32_TIME_STAMP_COUNTER 0x10
+
+#define MSR_PKG_CST_CONFIG_CONTROL 0xE2
+#define PKG_CST_LIMIT_MASK 0x7
+#define PKG_CST_LIMIT_C0 0x0
+#define PKG_CST_LIMIT_C2 0x1
+#define PKG_CST_LIMIT_C3 0x2
+#define PKG_CST_LIMIT_C6 0x3
+#define PKG_CST_LIMIT_C7 0x4
+#define PKG_CST_LIMIT_C7s 0x5
+#define PKG_CST_NO_LIMIT 0x7
+
+#define MSR_PKG_C2_RESIDENCY 0x60D
+#define MSR_PKG_C3_RESIDENCY 0x3F8
+#define MSR_PKG_C6_RESIDENCY 0x3F9
+#define MSR_PKG_C7_RESIDENCY 0x3FA
+#define MSR_PKG_C8_RESIDENCY 0x630
+#define MSR_PKG_C9_RESIDENCY 0x631
+#define MSR_PKG_C10_RESIDENCY 0x632
+
+#define NUM_PC_STATES 7
+
+const char *res_msr_names[] = {
+ "PC2", "PC3", "PC6", "PC7", "PC8", "PC9", "PC10"
+};
+
+const uint32_t res_msr_addrs[] = {
+ MSR_PKG_C2_RESIDENCY,
+ MSR_PKG_C3_RESIDENCY,
+ MSR_PKG_C6_RESIDENCY,
+ MSR_PKG_C7_RESIDENCY,
+ MSR_PKG_C8_RESIDENCY,
+ MSR_PKG_C9_RESIDENCY,
+ MSR_PKG_C10_RESIDENCY,
+};
+
+int msr_fd;
+
+uint32_t deepest_pc_state;
+uint64_t idle_res;
+
+#define MAX_CONNECTORS 32
+#define MAX_PLANES 32
+struct {
+ int fd;
+ drmModeResPtr res;
+ drmModeConnectorPtr connectors[MAX_CONNECTORS];
+ drm_intel_bufmgr *bufmgr;
+} drm;
+
+struct {
+ uint32_t crtc_id;
+ uint32_t connector_id;
+ drmModeModeInfoPtr mode;
+} modeset;
+
+int vblank_interval_us;
+struct igt_fb fbs[2], cursor, *front_fb, *back_fb;
+
+struct {
+ int draw_size;
+ bool do_page_flip;
+ bool do_draw;
+ bool do_draw_and_flip;
+ int res_warm_time;
+ int res_calc_time;
+ int loop_inc;
+ char *test_name;
+} opts = {
+ .draw_size = 0,
+ .do_page_flip = true,
+ .do_draw = true,
+ .do_draw_and_flip = true,
+ .res_warm_time = 1,
+ .res_calc_time = 4,
+ .loop_inc = 2,
+ .test_name = NULL,
+};
+
+static uint64_t msr_read(uint32_t addr)
+{
+ int rc;
+ uint64_t ret;
+
+ rc = pread(msr_fd, &ret, sizeof(uint64_t), addr);
+ igt_assert(rc == sizeof(ret));
+
+ return ret;
+}
+
+static void setup_msr(void)
+{
+#if 0
+ uint64_t control;
+ const char *limit;
+#endif
+
+ /* Make sure our Kernel supports MSR and the module is loaded. */
+ igt_assert(system("modprobe -q msr > /dev/null 2>&1") != -1);
+
+ msr_fd = open("/dev/cpu/0/msr", O_RDONLY);
+ igt_assert_f(msr_fd >= 0,
+ "Can't open /dev/cpu/0/msr.\n");
+
+#if 0
+ /* FIXME: why is this code not printing the truth? */
+ control = msr_read(MSR_PKG_CST_CONFIG_CONTROL);
+ printf("Control: 0x016%" PRIx64 "\n", control);
+ switch (control & PKG_CST_LIMIT_MASK) {
+ case PKG_CST_LIMIT_C0:
+ limit = "C0";
+ break;
+ case PKG_CST_LIMIT_C2:
+ limit = "C2";
+ break;
+ case PKG_CST_LIMIT_C3:
+ limit = "C3";
+ break;
+ case PKG_CST_LIMIT_C6:
+ limit = "C6";
+ break;
+ case PKG_CST_LIMIT_C7:
+ limit = "C7";
+ break;
+ case PKG_CST_LIMIT_C7s:
+ limit = "C7s";
+ break;
+ case PKG_CST_NO_LIMIT:
+ limit = "no limit";
+ break;
+ default:
+ limit = "unknown";
+ break;
+ }
+ printf("Package C state limit: %s\n", limit);
+#endif
+}
+
+static void teardown_msr(void)
+{
+ close(msr_fd);
+}
+
+static void setup_drm(void)
+{
+ int i;
+
+ drm.fd = drm_open_driver_master(DRIVER_INTEL);
+
+ drm.res = drmModeGetResources(drm.fd);
+ igt_assert(drm.res->count_connectors <= MAX_CONNECTORS);
+
+ for (i = 0; i < drm.res->count_connectors; i++)
+ drm.connectors[i] = drmModeGetConnector(drm.fd,
+ drm.res->connectors[i]);
+
+ drm.bufmgr = drm_intel_bufmgr_gem_init(drm.fd, 4096);
+ igt_assert(drm.bufmgr);
+ drm_intel_bufmgr_gem_enable_reuse(drm.bufmgr);
+}
+
+static void teardown_drm(void)
+{
+ int i;
+
+ drm_intel_bufmgr_destroy(drm.bufmgr);
+
+ for (i = 0; i < drm.res->count_connectors; i++)
+ drmModeFreeConnector(drm.connectors[i]);
+
+ drmModeFreeResources(drm.res);
+ close(drm.fd);
+}
+
+static void draw_rect(struct igt_fb *fb, enum igt_draw_method method,
+ uint32_t color)
+{
+ drmModeClip clip;
+ int rc;
+
+ switch (opts.draw_size) {
+ case 0:
+ clip.x1 = fb->width / 2 - 32;
+ clip.x2 = fb->width / 2 + 32;
+ clip.y1 = fb->height / 2 - 32;
+ clip.y2 = fb->height / 2 + 32;
+ break;
+ case 1:
+ clip.x1 = fb->width / 4;
+ clip.x2 = fb->width / 4 + fb->width / 2;
+ clip.y1 = fb->height / 4;
+ clip.y2 = fb->height / 4 + fb->height / 2;
+ break;
+ case 2:
+ clip.x1 = 0;
+ clip.x2 = fb->width;
+ clip.y1 = 0;
+ clip.y2 = fb->height;
+ break;
+ default:
+ igt_assert(false);
+ }
+
+ igt_draw_rect_fb(drm.fd, drm.bufmgr, NULL, fb, method, clip.x1, clip.y1,
+ clip.x2 - clip.x1, clip.y2 - clip.y1, color);
+
+ if (method == IGT_DRAW_MMAP_WC) {
+ rc = drmModeDirtyFB(drm.fd, fb->fb_id, &clip, 1);
+ igt_assert(rc == 0 || rc == -ENOSYS);
+ }
+}
+
+static void setup_modeset(void)
+{
+ int i;
+
+ for (i = 0; i < drm.res->count_connectors; i++) {
+ drmModeConnectorPtr c = drm.connectors[i];
+
+ if (c->connection == DRM_MODE_CONNECTED &&
+ c->count_modes > 0) {
+ modeset.connector_id = c->connector_id;
+ modeset.mode = &c->modes[0];
+ break;
+ }
+ }
+ igt_assert(i < drm.res->count_connectors);
+
+ modeset.crtc_id = drm.res->crtcs[0];
+
+ for (i = 0; i < 2; i++) {
+ igt_create_fb(drm.fd, modeset.mode->hdisplay,
+ modeset.mode->vdisplay, DRM_FORMAT_XRGB8888,
+ LOCAL_I915_FORMAT_MOD_X_TILED, &fbs[i]);
+ igt_draw_fill_fb(drm.fd, &fbs[i], 0x80);
+ }
+ draw_rect(&fbs[1], IGT_DRAW_BLT, 0x800000);
+
+ igt_create_fb(drm.fd, 64, 64, DRM_FORMAT_ARGB8888,
+ LOCAL_DRM_FORMAT_MOD_NONE, &cursor);
+ igt_draw_fill_fb(drm.fd, &cursor, 0xFF008000);
+}
+
+static void teardown_modeset(void)
+{
+ igt_remove_fb(drm.fd, &fbs[0]);
+ igt_remove_fb(drm.fd, &fbs[1]);
+ igt_remove_fb(drm.fd, &cursor);
+}
+
+static void setup_vblank_interval(void)
+{
+ uint64_t vrefresh, interval;
+
+ vrefresh = ((uint64_t) modeset.mode->clock * 1000 * 1000) /
+ (modeset.mode->htotal * modeset.mode->vtotal);
+ interval = 1000000000 / vrefresh;
+
+ vblank_interval_us = interval;
+
+ printf("Interval between vblanks:\t%dus\n", vblank_interval_us);
+}
+
+bool alarm_received;
+static void alarm_handler(int signal)
+{
+ alarm_received = true;
+}
+
+static void setup_alarm(void)
+{
+ struct sigaction sa;
+
+ sa.sa_handler = alarm_handler;
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+ sigaction(SIGALRM, &sa, NULL);
+}
+
+static void unset_mode(void)
+{
+ int rc;
+
+ kmstest_unset_all_crtcs(drm.fd, drm.res);
+ rc = drmModeSetCursor(drm.fd, modeset.crtc_id, 0, 0, 0);
+ igt_assert(rc == 0);
+}
+
+static void set_mode(void)
+{
+ int rc;
+
+ front_fb = &fbs[0];
+ back_fb = &fbs[1];
+ rc = drmModeSetCrtc(drm.fd, modeset.crtc_id, front_fb->fb_id, 0, 0,
+ &modeset.connector_id, 1, modeset.mode);
+ igt_assert(rc == 0);
+
+ /* TODO: it seems we need a cursor in order to reach PC7 on BDW. Why? */
+ rc = drmModeMoveCursor(drm.fd, modeset.crtc_id, 0, 0);
+ igt_assert(rc == 0);
+
+ rc = drmModeSetCursor(drm.fd, modeset.crtc_id, cursor.gem_handle,
+ cursor.width, cursor.height);
+ igt_assert(rc == 0);
+}
+
+static void wait_vblanks(int n_vblanks)
+{
+ drmVBlank vblank;
+
+ if (!n_vblanks)
+ return;
+
+ vblank.request.type = DRM_VBLANK_RELATIVE;
+ vblank.request.sequence = n_vblanks;
+ vblank.request.signal = 0;
+ drmWaitVBlank(drm.fd, &vblank);
+}
+
+static void page_flip(void)
+{
+ struct igt_fb *tmp_fb;
+ int rc;
+
+ rc = drmModePageFlip(drm.fd, modeset.crtc_id, back_fb->fb_id, 0, NULL);
+ igt_assert(rc == 0);
+
+ tmp_fb = front_fb;
+ front_fb = back_fb;
+ back_fb = tmp_fb;
+}
+
+static void wait_until_idle(void)
+{
+ uint64_t tsc, pc, res;
+
+ do {
+ alarm_received = false;
+ ualarm(500 * 1000, 0);
+
+ tsc = msr_read(IA32_TIME_STAMP_COUNTER);
+ pc = msr_read(deepest_pc_state);
+
+ while (!alarm_received)
+ pause();
+
+ pc = msr_read(deepest_pc_state) - pc;
+ tsc = msr_read(IA32_TIME_STAMP_COUNTER) - tsc;
+
+ res = pc * 100 / tsc;
+
+ /*printf("res:%02"PRIu64"\n", res);*/
+ } while (res < idle_res && idle_res - res > 3);
+
+ if (res > idle_res && res - idle_res > 3)
+ fprintf(stderr, "The calculated idle residency may be too low "
+ "(got %02"PRIu64"%%)\n", res);
+}
+
+static uint64_t do_measurement(void (*callback)(void *ptr), void *ptr)
+{
+ uint64_t tsc, pc;
+
+ wait_until_idle();
+
+ alarm_received = false;
+ alarm(opts.res_warm_time);
+ callback(ptr);
+
+ alarm_received = false;
+ alarm(opts.res_calc_time);
+
+ tsc = msr_read(IA32_TIME_STAMP_COUNTER);
+ pc = msr_read(deepest_pc_state);
+
+ callback(ptr);
+
+ pc = msr_read(deepest_pc_state) - pc;
+ tsc = msr_read(IA32_TIME_STAMP_COUNTER) - tsc;
+
+ return pc * 100 / tsc;
+}
+
+static void setup_idle(void)
+{
+ uint64_t tsc, pc[NUM_PC_STATES], res, best_res;
+ int pc_i, best_pc_i = 0, retries, consecutive_not_best;
+
+ for (retries = 0; ; retries++) {
+
+ alarm_received = false;
+ alarm(opts.res_warm_time);
+ while (!alarm_received)
+ pause();
+
+ alarm_received = false;
+ alarm(opts.res_calc_time);
+
+ tsc = msr_read(IA32_TIME_STAMP_COUNTER);
+ for (pc_i = best_pc_i; pc_i < NUM_PC_STATES; pc_i++)
+ pc[pc_i] = msr_read(res_msr_addrs[pc_i]);
+
+ while (!alarm_received)
+ pause();
+
+ for (pc_i = best_pc_i; pc_i < NUM_PC_STATES; pc_i++)
+ pc[pc_i] = msr_read(res_msr_addrs[pc_i]) - pc[pc_i];
+ tsc = msr_read(IA32_TIME_STAMP_COUNTER) - tsc;
+
+ for (pc_i = NUM_PC_STATES -1; pc_i >= best_pc_i; pc_i--)
+ if (pc[pc_i] != 0)
+ break;
+ igt_require_f(pc_i >= 0, "We're not reaching any PC states!\n");
+
+ res = pc[pc_i] * 100 / tsc;
+
+ if (retries == 0 || pc_i > best_pc_i || res > best_res) {
+ best_pc_i = pc_i;
+ best_res = res;
+ consecutive_not_best = 0;
+ } else {
+ consecutive_not_best++;
+ if (consecutive_not_best > 2)
+ break;
+ }
+ }
+
+ deepest_pc_state = res_msr_addrs[best_pc_i];
+ idle_res = best_res;
+
+ printf("Stable idle residency retries:\t%d\n", retries);
+ printf("Deepest PC state reached when idle:\t%s\n",
+ res_msr_names[best_pc_i]);
+ printf("Idle residency for this state:\t%02"PRIu64"%%\n", idle_res);
+}
+
+static void print_result(int ops, int vblanks, uint64_t res)
+{
+ printf("- %02d ops every %02d vblanks:\t%02"PRIu64"%%\n",
+ ops, vblanks, res);
+ fflush(stdout);
+}
+
+struct page_flip_data {
+ int n_vblanks;
+};
+
+static void page_flip_cb(void *ptr)
+{
+ struct page_flip_data *data = ptr;
+
+ while (!alarm_received) {
+ page_flip();
+ wait_vblanks(data->n_vblanks);
+ }
+}
+
+static void page_flip_test(void)
+{
+ struct page_flip_data data;
+ int n_vblanks;
+ uint64_t res;
+
+ printf("\nPage flip test:\n");
+
+ for (n_vblanks = 1; n_vblanks <= 64; n_vblanks *= opts.loop_inc) {
+ data.n_vblanks = n_vblanks;
+ res = do_measurement(page_flip_cb, &data);
+ print_result(1, n_vblanks, res);
+ }
+}
+
+struct draw_data {
+ enum igt_draw_method method;
+ int n_vblanks;
+ int ops_per_vblank;
+};
+
+static void draw_cb(void *ptr)
+{
+ struct draw_data *data = ptr;
+ struct timespec req;
+ int i, ops;
+
+ req.tv_sec = 0;
+ req.tv_nsec = vblank_interval_us * 1000 / data->ops_per_vblank;
+
+ for (i = 0; !alarm_received; i++) {
+ for (ops = 0; ops < data->ops_per_vblank; ops++) {
+ draw_rect(front_fb, data->method, i << 8);
+
+ /* The code that stops the callbacks relies on SIGALRM,
+ * so we have to use nanosleep since it doesn't use
+ * signals. */
+ if (data->ops_per_vblank > 1)
+ nanosleep(&req, NULL);
+ }
+
+ if (data->n_vblanks)
+ wait_vblanks(data->n_vblanks);
+ }
+}
+
+static void draw_test(void)
+{
+ struct draw_data data;
+ enum igt_draw_method method;
+ int i;
+ uint64_t res;
+
+ for (method = 0; method < IGT_DRAW_METHOD_COUNT; method++) {
+ data.method = method;
+
+ printf("\nDraw %s test:\n",
+ igt_draw_get_method_name(method));
+
+ data.n_vblanks = 0;
+ for (i = 32; i >= 2; i /= opts.loop_inc) {
+ data.ops_per_vblank = i;
+ res = do_measurement(draw_cb, &data);
+ print_result(i, 1, res);
+ }
+
+ data.ops_per_vblank = 1;
+ for (i = 1; i <= 64; i *= opts.loop_inc) {
+ data.n_vblanks = i ;
+ res = do_measurement(draw_cb, &data);
+ print_result(1, i, res);
+ }
+ }
+}
+
+static void draw_and_flip_cb(void *ptr)
+{
+ struct draw_data *data = ptr;
+ int i, ops;
+
+ for (i = 0; !alarm_received; i++) {
+ for (ops = 0; ops < data->ops_per_vblank; ops++)
+ draw_rect(back_fb, data->method, i << 8);
+
+ page_flip();
+ wait_vblanks(1);
+ }
+}
+
+static void draw_and_flip_test(void)
+{
+ struct draw_data data;
+ enum igt_draw_method method;
+ int i;
+ uint64_t res;
+
+ for (method = 0; method < IGT_DRAW_METHOD_COUNT; method++) {
+ data.method = method;
+
+ /* Doing everything consumes too much time! */
+ if (method != IGT_DRAW_MMAP_CPU && method != IGT_DRAW_BLT)
+ continue;
+
+ printf("\nDraw and flip %s test:\n",
+ igt_draw_get_method_name(method));
+
+ for (i = 16; i >= 1; i /= opts.loop_inc) {
+ data.ops_per_vblank = 1;
+ res = do_measurement(draw_and_flip_cb, &data);
+ print_result(i, 1, res);
+ }
+ }
+}
+
+static void parse_opts(int argc, char *argv[])
+{
+ int opt;
+ char short_opts[] = "d:lrbw:c:i:fsn:";
+ struct option long_opts[] = {
+ { "draw-size", required_argument, NULL, 'd'},
+ { "no-flip", no_argument, NULL, 'l'},
+ { "no-draw", no_argument, NULL, 'r'},
+ { "no-draw-and-flip", no_argument, NULL, 'b'},
+ { "warm-time", required_argument, NULL, 'w'},
+ { "calc-time", required_argument, NULL, 'c'},
+ { "loop-increment", required_argument, NULL, 'i'},
+ { "fast", no_argument, NULL, 'f'},
+ { "slow", no_argument, NULL, 's'},
+ { "name", required_argument, NULL, 'n'},
+ { 0 },
+ };
+
+ while (1) {
+ opt = getopt_long(argc, argv, short_opts, long_opts, NULL);
+
+ switch (opt) {
+ case 'd':
+ if (strcmp(optarg, "s") == 0)
+ opts.draw_size = 0;
+ else if (strcmp(optarg, "m") == 0)
+ opts.draw_size = 1;
+ else if (strcmp(optarg, "l") == 0)
+ opts.draw_size = 2;
+ else
+ igt_assert(false);
+ break;
+ case 'l':
+ opts.do_page_flip = false;
+ break;
+ case 'r':
+ opts.do_draw = false;
+ break;
+ case 'b':
+ opts.do_draw_and_flip = false;
+ break;
+ case 'w':
+ opts.res_warm_time = atoi(optarg);
+ break;
+ case 'c':
+ opts.res_calc_time = atoi(optarg);
+ break;
+ case 'i':
+ opts.loop_inc = atoi(optarg);
+ break;
+ case 'f':
+ opts.res_warm_time = 1;
+ opts.res_calc_time = 2;
+ opts.loop_inc = 4;
+ break;
+ case 's':
+ opts.res_warm_time = 2;
+ opts.res_calc_time = 6;
+ opts.loop_inc = 2;
+ break;
+ case 'n':
+ opts.test_name = optarg;
+ break;
+ case -1:
+ return;
+ default:
+ igt_assert(false);
+ }
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ parse_opts(argc, argv);
+
+ setup_msr();
+ setup_drm();
+ setup_modeset();
+ setup_vblank_interval();
+ setup_alarm();
+
+ printf("Test name:\t%s\n", opts.test_name);
+
+ unset_mode();
+ set_mode();
+
+ setup_idle();
+
+ if (opts.do_page_flip)
+ page_flip_test();
+
+ if (opts.do_draw)
+ draw_test();
+
+ if (opts.do_draw_and_flip)
+ draw_and_flip_test();
+
+ teardown_modeset();
+ teardown_drm();
+ teardown_msr();
+ return 0;
+}
After the recent discussions regarding the effects of the vblank disabling policies on PC state residencies, I started running some experiments to reevaluate some non-intuitive conclusions I had reached. In order to help me do this, I decided to write this tool. The idea is very simple: the tool puts the system on an screen-on idle state, checks which PC state residency is the deepest we can reach, measures its residency, then does some not-so-idle tests and measures the residencies. You can use the tool to compare different Kernel trees and you can also use the tool to compare enabled vs disabled features. It's obvious that these cases do not represent real-world use cases of our driver, but they are already enough to highlight differences between the many patches I wrote. I was even able to catch a bug in one of my patches by spotting an unexpected regression in the residencies. I've been using this tool for FBC, but I expect it to also be useful for PSR, DRRS and similar features. I've been measuring the effects of different optimizations I wrote, and I've also been measuring the FBC vs no-FBC cases. It is also important to highlight that if your system is not properly configured for efficient power savings the tool may not be able to show differences between the results. On my Broadwell machine, for example, if I don't run "powertop --auto-tune" before running the tool, I get PC2 as the deepest state, and 90%+ residency for every workload. After properly configuring the machine, I get PC7 as the deepest state, which is the expected. So far I only tested this tool on BDW and SKL, and it may hit some unexpected assertions for older platforms. I only implemented the cases that are immediately useful for me, but we may also expand the tool in the future. We can add more important workloads. We can add support for screen-off cases, so we can compare the effects of runtime PM and other screen-off features. There's a lot we can do, but none of this is on my current priority list. And remember: /usr/bin/paste is your friend when comparing results. v2: - Be more idle at setup_idle(). - Improve printing for /usr/bin/paste usage. Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com> --- tools/.gitignore | 1 + tools/Makefile.sources | 1 + tools/intel_residency.c | 708 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 710 insertions(+) create mode 100644 tools/intel_residency.c I kept using the tool after the initial submission and improved it a little bit. Now I plan to push it quickly since some people seem to be interested.