From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Just a little helper for code that needs to wait for a certain
condition to happen. It has the nice advantage that it can survive the
signal helper.
Despite the callers added in this patch, there is another that will go
in a separate patch, and another in a new IGT test file that I plan to
push later.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
lib/igt_aux.c | 18 +-----------------
lib/igt_aux.h | 40 ++++++++++++++++++++++++++++++++++++++++
tests/pm_rpm.c | 28 +++++-----------------------
3 files changed, 46 insertions(+), 40 deletions(-)
diff --git a/lib/igt_aux.c b/lib/igt_aux.c
index 3051d84..180141e 100644
--- a/lib/igt_aux.c
+++ b/lib/igt_aux.c
@@ -518,29 +518,13 @@ enum igt_runtime_pm_status igt_get_runtime_pm_status(void)
* Waits until for the driver to switch to into the desired runtime PM status,
* with a 10 second timeout.
*
- * Some subtests call this function while the signal helper is active, so we
- * can't assume each usleep() call will sleep for 100ms.
- *
* 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)
{
- struct timeval start, end, diff;
-
- igt_assert(gettimeofday(&start, NULL) == 0);
- do {
- if (igt_get_runtime_pm_status() == status)
- return true;
-
- usleep(100 * 1000);
-
- igt_assert(gettimeofday(&end, NULL) == 0);
- timersub(&end, &start, &diff);
- } while (diff.tv_sec < 10);
-
- return false;
+ return igt_wait(igt_get_runtime_pm_status() == status, 10000, 100);
}
/* Functions with prefix kmstest_ independent of cairo library are pulled out
diff --git a/lib/igt_aux.h b/lib/igt_aux.h
index 6c83c53..48c495b 100644
--- a/lib/igt_aux.h
+++ b/lib/igt_aux.h
@@ -30,6 +30,7 @@
#include <intel_bufmgr.h>
#include <stdbool.h>
+#include <sys/time.h>
extern drm_intel_bo **trash_bos;
extern int num_trash_bos;
@@ -90,4 +91,43 @@ void intel_require_memory(uint32_t count, uint32_t size, unsigned mode);
#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))
+/**
+ * igt_wait:
+ * @COND: condition to wait
+ * @timeout_ms: timeout in milliseconds
+ * @interval_ms: amount of time we try to sleep between COND checks
+ *
+ * Waits until COND evaluates to true or the timeout passes.
+ *
+ * It is safe to call this macro if the signal helper is active. The only
+ * problem is that the usleep() calls will return early, making us evaluate COND
+ * too often, possibly eating valuable CPU cycles.
+ *
+ * Returns:
+ * True of COND evaluated to true, false otherwise.
+ */
+#define igt_wait(COND, timeout_ms, interval_ms) ({ \
+ struct timeval start_, end_, diff_; \
+ int elapsed_ms_; \
+ bool ret_ = false; \
+ \
+ igt_assert(gettimeofday(&start_, NULL) == 0); \
+ do { \
+ if (COND) { \
+ ret_ = true; \
+ break; \
+ } \
+ \
+ usleep(interval_ms * 1000); \
+ \
+ igt_assert(gettimeofday(&end_, NULL) == 0); \
+ timersub(&end_, &start_, &diff_); \
+ \
+ elapsed_ms_ = diff_.tv_sec * 1000 + \
+ diff_.tv_usec / 1000; \
+ } while (elapsed_ms_ < timeout_ms); \
+ \
+ ret_; \
+})
+
#endif /* IGT_AUX_H */
diff --git a/tests/pm_rpm.c b/tests/pm_rpm.c
index c120d75..b7f9635 100644
--- a/tests/pm_rpm.c
+++ b/tests/pm_rpm.c
@@ -153,24 +153,16 @@ static uint64_t get_residency(uint32_t type)
static bool pc8_plus_residency_changed(unsigned int timeout_sec)
{
- unsigned int i;
uint64_t res_pc8, res_pc9, res_pc10;
- int to_sleep = 100 * 1000;
res_pc8 = get_residency(MSR_PC8_RES);
res_pc9 = get_residency(MSR_PC9_RES);
res_pc10 = get_residency(MSR_PC10_RES);
- for (i = 0; i < timeout_sec * 1000 * 1000; i += to_sleep) {
- if (res_pc8 != get_residency(MSR_PC8_RES) ||
- res_pc9 != get_residency(MSR_PC9_RES) ||
- res_pc10 != get_residency(MSR_PC10_RES)) {
- return true;
- }
- usleep(to_sleep);
- }
-
- return false;
+ return igt_wait(res_pc8 != get_residency(MSR_PC8_RES) ||
+ res_pc9 != get_residency(MSR_PC9_RES) ||
+ res_pc10 != get_residency(MSR_PC10_RES),
+ timeout_sec * 1000, 100);
}
static enum pc8_status get_pc8_status(void)
@@ -191,17 +183,7 @@ static enum pc8_status get_pc8_status(void)
static bool wait_for_pc8_status(enum pc8_status status)
{
- int i;
- int hundred_ms = 100 * 1000, ten_s = 10 * 1000 * 1000;
-
- for (i = 0; i < ten_s; i += hundred_ms) {
- if (get_pc8_status() == status)
- return true;
-
- usleep(hundred_ms);
- }
-
- return false;
+ return igt_wait(get_pc8_status() == status, 10000, 100);
}
static bool wait_for_suspended(void)
--
2.1.3
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