From 663d758d919610b09a8bddbadd8a0b668eab6be8 Mon Sep 17 00:00:00 2001 From: Jeff McGee Date: Fri, 31 Jan 2014 10:13:52 -0600 Subject: [PATCH] pm_rps: Add variable load support to load helper 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 Signed-off-by: Daniel Vetter --- tests/pm_rps.c | 35 ++++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-) diff --git a/tests/pm_rps.c b/tests/pm_rps.c index 9277196..05b859c 100644 --- a/tests/pm_rps.c +++ b/tests/pm_rps.c @@ -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(); } -- 2.7.4