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pm_rps: Add variable load support to load helper

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The load helper can be set to HIGH or LOW. HIGH is the original mode
of sending continuous dword store commands. LOW adds a pause between
each command to reduce throughput.

Signed-off-by: Jeff McGee <jeff.mcgee@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jeff McGee 2014-01-31 10:13:52 -06:00 committed by Daniel Vetter
parent 22dfb0988a
commit 663d758d91
1 changed files with 32 additions and 3 deletions
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35
tests/pm_rps.c
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@ -146,6 +146,11 @@ static void dumpit(const int *freqs)
#define dump(x) if (verbose) dumpit(x)
#define log(...) if (verbose) printf(__VA_ARGS__)
enum load {
LOW,
HIGH
};
static struct load_helper {
int devid;
int has_ppgtt;
@ -153,13 +158,17 @@ static struct load_helper {
struct intel_batchbuffer *batch;
drm_intel_bo *target_buffer;
bool ready;
enum load load;
bool exit;
struct igt_helper_process igt_proc;
} lh;
static void load_helper_signal_handler(int sig)
{
lh.exit = true;
if (sig == SIGUSR2)
lh.load = lh.load == LOW ? HIGH : LOW;
else
lh.exit = true;
}
static void emit_store_dword_imm(uint32_t val)
@ -190,21 +199,30 @@ static void emit_store_dword_imm(uint32_t val)
}
}
static void load_helper_run(void)
#define LOAD_HELPER_PAUSE_USEC 500
static void load_helper_run(enum load load)
{
assert(!lh.igt_proc.running);
igt_require(lh.ready == true);
lh.load = load;
igt_fork_helper(&lh.igt_proc) {
uint32_t val = 0;
signal(SIGUSR1, load_helper_signal_handler);
signal(SIGUSR2, load_helper_signal_handler);
while (!lh.exit) {
emit_store_dword_imm(val);
intel_batchbuffer_flush_on_ring(lh.batch, 0);
val++;
/* Lower the load by pausing after every submitted
* write. */
if (lh.load == LOW)
usleep(LOAD_HELPER_PAUSE_USEC);
}
/* Map buffer to stall for write completion */
@ -215,6 +233,17 @@ static void load_helper_run(void)
}
}
static void load_helper_set_load(enum load load)
{
assert(lh.igt_proc.running);
if (lh.load == load)
return;
lh.load = load;
kill(lh.igt_proc.pid, SIGUSR2);
}
static void load_helper_stop(void)
{
assert(lh.igt_proc.running);
@ -521,7 +550,7 @@ int main(int argc, char **argv)
min_max_config(idle_check);
igt_subtest("min-max-config-loaded") {
load_helper_run();
load_helper_run(HIGH);
min_max_config(loaded_check);
load_helper_stop();
}