From bd521b493e73d987669afbce8da6418e1aed7db6 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Wed, 14 May 2014 16:10:50 +0200 Subject: lib/igt_aux: Extract runtime pm helpers from pm_pc8 I want to use them elsewhere ... Signed-off-by: Daniel Vetter --- lib/igt_aux.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ lib/igt_aux.h | 11 ++++++ 2 files changed, 125 insertions(+) (limited to 'lib') diff --git a/lib/igt_aux.c b/lib/igt_aux.c index 5ae2e427..182e1c04 100644 --- a/lib/igt_aux.c +++ b/lib/igt_aux.c @@ -369,3 +369,117 @@ void igt_wait_for_keypress(void) getchar(); tcsetattr ( STDIN_FILENO, TCSANOW, &oldt ); } + +#define POWER_DIR "/sys/devices/pci0000:00/0000:00:02.0/power" +/* We just leak this on exit ... */ +int pm_status_fd = -1; + +/** + * igt_setup_runtime_pm: + * + * Sets up the runtime PM helper functions and enables runtime PM. To speed up + * tests the autosuspend delay is set to 0. + * + * Returns: + * True if runtime pm is available, false otherwise. + */ +bool igt_setup_runtime_pm(void) +{ + int fd; + ssize_t size; + char buf[6]; + + if (pm_status_fd >= 0) + return true; + + /* Our implementation uses autosuspend. Try to set it to 0ms so the test + * suite goes faster and we have a higher probability of triggering race + * conditions. */ + fd = open(POWER_DIR "/autosuspend_delay_ms", O_WRONLY); + igt_assert_f(fd >= 0, + "Can't open " POWER_DIR "/autosuspend_delay_ms\n"); + + /* If we fail to write to the file, it means this system doesn't support + * runtime PM. */ + size = write(fd, "0\n", 2); + + close(fd); + + if (size != 2) + return false; + + /* We know we support runtime PM, let's try to enable it now. */ + fd = open(POWER_DIR "/control", O_RDWR); + igt_assert_f(fd >= 0, "Can't open " POWER_DIR "/control\n"); + + size = write(fd, "auto\n", 5); + igt_assert(size == 5); + + lseek(fd, 0, SEEK_SET); + size = read(fd, buf, ARRAY_SIZE(buf)); + igt_assert(size == 5); + igt_assert(strncmp(buf, "auto\n", 5) == 0); + + close(fd); + + pm_status_fd = open(POWER_DIR "/runtime_status", O_RDONLY); + igt_assert_f(pm_status_fd >= 0, + "Can't open " POWER_DIR "/runtime_status\n"); + + return true; +} + +/** + * igt_runtime_pm_status: + * + * Returns: + * The current runtime PM status. + */ +enum igt_runtime_pm_status igt_get_runtime_pm_status(void) +{ + ssize_t n_read; + char buf[32]; + + lseek(pm_status_fd, 0, SEEK_SET); + n_read = read(pm_status_fd, buf, ARRAY_SIZE(buf)); + igt_assert(n_read >= 0); + buf[n_read] = '\0'; + + if (strncmp(buf, "suspended\n", n_read) == 0) + return IGT_RUNTIME_PM_STATUS_SUSPENDED; + else if (strncmp(buf, "active\n", n_read) == 0) + return IGT_RUNTIME_PM_STATUS_ACTIVE; + else if (strncmp(buf, "suspending\n", n_read) == 0) + return IGT_RUNTIME_PM_STATUS_SUSPENDING; + else if (strncmp(buf, "resuming\n", n_read) == 0) + return IGT_RUNTIME_PM_STATUS_RESUMING; + + igt_assert_f(false, "Unknown status %s\n", buf); + return IGT_RUNTIME_PM_STATUS_UNKNOWN; +} + +/** + * igt_wait_for_pm_status: + * @status: desired runtime PM status + * + * Waits until for the driver to switch to into the desired runtime PM status, + * with a 10 second timeout. + * + * Returns: + * True if the desired runtime PM status was attained, false if the operation + * timed out. + */ +bool igt_wait_for_pm_status(enum igt_runtime_pm_status status) +{ + int i; + int hundred_ms = 100 * 1000, ten_s = 10 * 1000 * 1000; + + for (i = 0; i < ten_s; i += hundred_ms) { + if (igt_get_runtime_pm_status() == status) + return true; + + usleep(hundred_ms); + } + + return false; +} diff --git a/lib/igt_aux.h b/lib/igt_aux.h index aa8a3878..597580da 100644 --- a/lib/igt_aux.h +++ b/lib/igt_aux.h @@ -57,6 +57,17 @@ void igt_drop_root(void); void igt_wait_for_keypress(void); +enum igt_runtime_pm_status { + IGT_RUNTIME_PM_STATUS_ACTIVE, + IGT_RUNTIME_PM_STATUS_SUSPENDED, + IGT_RUNTIME_PM_STATUS_SUSPENDING, + IGT_RUNTIME_PM_STATUS_RESUMING, + IGT_RUNTIME_PM_STATUS_UNKNOWN, +}; +bool igt_setup_runtime_pm(void); +enum igt_runtime_pm_status igt_get_runtime_pm_status(void); +bool igt_wait_for_pm_status(enum igt_runtime_pm_status status); + /* sysinfo cross-arch wrappers from intel_os.c */ /* These are separate to allow easier testing when porting, see the comment at -- cgit v1.2.3