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lib: add igt_wait()

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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.

v2: Check COND again before returning in case we hit the timeout.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
This commit is contained in:
Paulo Zanoni 2014-12-03 16:12:49 -02:00
parent a734ac2058
commit 9bb04d3aa6
3 changed files with 49 additions and 40 deletions
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18
lib/igt_aux.c
View File

@ -606,29 +606,13 @@ 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

43
lib/igt_aux.h
View File

@ -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;
@ -102,4 +103,46 @@ void intel_require_memory(uint32_t count, uint32_t size, unsigned mode);
void igt_lock_mem(size_t size);
void igt_unlock_mem(void);
/**
* 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); \
\
if (!ret_ && (COND)) \
ret_ = true; \
\
ret_; \
})
#endif /* IGT_AUX_H */

28
tests/pm_rpm.c
View File

@ -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)