This test will validate we can achieve actual frequency of RP0. Pcode grants frequencies based on what GuC is requesting. However, thermal throttling can limit what is being granted. Add a test to request for max, but don't fail the test if RP0 is not granted due to throttle reasons.
Also optimize the selftest by using a common run_test function to avoid code duplication. Rename the "clamp" tests to vary_max_freq and vary_min_freq.
v2: Fix compile warning v3: Review comments (Ashutosh). Added a FIXME for the media RP0 case.
Fixes 8ee2c227822e ("drm/i915/guc/slpc: Add SLPC selftest")
Cc: Ashutosh Dixit ashutosh.dixit@intel.com Signed-off-by: Vinay Belgaumkar vinay.belgaumkar@intel.com --- drivers/gpu/drm/i915/gt/selftest_slpc.c | 324 ++++++++++++------------ 1 file changed, 157 insertions(+), 167 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/selftest_slpc.c b/drivers/gpu/drm/i915/gt/selftest_slpc.c index b768cea5943d..2b8c10b4e38a 100644 --- a/drivers/gpu/drm/i915/gt/selftest_slpc.c +++ b/drivers/gpu/drm/i915/gt/selftest_slpc.c @@ -8,6 +8,11 @@ #define delay_for_h2g() usleep_range(H2G_DELAY, H2G_DELAY + 10000) #define FREQUENCY_REQ_UNIT DIV_ROUND_CLOSEST(GT_FREQUENCY_MULTIPLIER, \ GEN9_FREQ_SCALER) +enum test_type { + VARY_MIN, + VARY_MAX, + MAX_GRANTED +};
static int slpc_set_min_freq(struct intel_guc_slpc *slpc, u32 freq) { @@ -36,147 +41,115 @@ static int slpc_set_max_freq(struct intel_guc_slpc *slpc, u32 freq) return ret; }
-static int live_slpc_clamp_min(void *arg) +static int vary_max_freq(struct intel_guc_slpc *slpc, struct intel_rps *rps, + u32 *max_act_freq) { - struct drm_i915_private *i915 = arg; - struct intel_gt *gt = to_gt(i915); - struct intel_guc_slpc *slpc = >->uc.guc.slpc; - struct intel_rps *rps = >->rps; - struct intel_engine_cs *engine; - enum intel_engine_id id; - struct igt_spinner spin; - u32 slpc_min_freq, slpc_max_freq; + u32 step, max_freq, req_freq; + u32 act_freq; int err = 0;
- if (!intel_uc_uses_guc_slpc(>->uc)) - return 0; + /* Go from max to min in 5 steps */ + step = (slpc->rp0_freq - slpc->min_freq) / NUM_STEPS; + *max_act_freq = slpc->min_freq; + for (max_freq = slpc->rp0_freq; max_freq > slpc->min_freq; + max_freq -= step) { + err = slpc_set_max_freq(slpc, max_freq); + if (err) + break;
- if (igt_spinner_init(&spin, gt)) - return -ENOMEM; + req_freq = intel_rps_read_punit_req_frequency(rps);
- if (intel_guc_slpc_get_max_freq(slpc, &slpc_max_freq)) { - pr_err("Could not get SLPC max freq\n"); - return -EIO; - } + /* GuC requests freq in multiples of 50/3 MHz */ + if (req_freq > (max_freq + FREQUENCY_REQ_UNIT)) { + pr_err("SWReq is %d, should be at most %d\n", req_freq, + max_freq + FREQUENCY_REQ_UNIT); + err = -EINVAL; + }
- if (intel_guc_slpc_get_min_freq(slpc, &slpc_min_freq)) { - pr_err("Could not get SLPC min freq\n"); - return -EIO; - } + act_freq = intel_rps_read_actual_frequency(rps); + if (act_freq > *max_act_freq) + *max_act_freq = act_freq;
- if (slpc_min_freq == slpc_max_freq) { - pr_err("Min/Max are fused to the same value\n"); - return -EINVAL; + if (err) + break; }
- intel_gt_pm_wait_for_idle(gt); - intel_gt_pm_get(gt); - for_each_engine(engine, gt, id) { - struct i915_request *rq; - u32 step, min_freq, req_freq; - u32 act_freq, max_act_freq; + return err; +}
- if (!intel_engine_can_store_dword(engine)) - continue; +static int vary_min_freq(struct intel_guc_slpc *slpc, struct intel_rps *rps, + u32 *max_act_freq) +{ + u32 step, min_freq, req_freq; + u32 act_freq; + int err = 0;
- /* Go from min to max in 5 steps */ - step = (slpc_max_freq - slpc_min_freq) / NUM_STEPS; - max_act_freq = slpc_min_freq; - for (min_freq = slpc_min_freq; min_freq < slpc_max_freq; - min_freq += step) { - err = slpc_set_min_freq(slpc, min_freq); - if (err) - break; - - st_engine_heartbeat_disable(engine); - - rq = igt_spinner_create_request(&spin, - engine->kernel_context, - MI_NOOP); - if (IS_ERR(rq)) { - err = PTR_ERR(rq); - st_engine_heartbeat_enable(engine); - break; - } + /* Go from min to max in 5 steps */ + step = (slpc->rp0_freq - slpc->min_freq) / NUM_STEPS; + *max_act_freq = slpc->min_freq; + for (min_freq = slpc->min_freq; min_freq < slpc->rp0_freq; + min_freq += step) { + err = slpc_set_min_freq(slpc, min_freq); + if (err) + break;
- i915_request_add(rq); + req_freq = intel_rps_read_punit_req_frequency(rps);
- if (!igt_wait_for_spinner(&spin, rq)) { - pr_err("%s: Spinner did not start\n", - engine->name); - igt_spinner_end(&spin); - st_engine_heartbeat_enable(engine); - intel_gt_set_wedged(engine->gt); - err = -EIO; - break; - } + /* GuC requests freq in multiples of 50/3 MHz */ + if (req_freq < (min_freq - FREQUENCY_REQ_UNIT)) { + pr_err("SWReq is %d, should be at least %d\n", req_freq, + min_freq - FREQUENCY_REQ_UNIT); + err = -EINVAL; + }
- /* Wait for GuC to detect business and raise - * requested frequency if necessary. - */ - delay_for_h2g(); + act_freq = intel_rps_read_actual_frequency(rps); + if (act_freq > *max_act_freq) + *max_act_freq = act_freq;
- req_freq = intel_rps_read_punit_req_frequency(rps); + if (err) + break; + }
- /* GuC requests freq in multiples of 50/3 MHz */ - if (req_freq < (min_freq - FREQUENCY_REQ_UNIT)) { - pr_err("SWReq is %d, should be at least %d\n", req_freq, - min_freq - FREQUENCY_REQ_UNIT); - igt_spinner_end(&spin); - st_engine_heartbeat_enable(engine); - err = -EINVAL; - break; - } + return err; +}
- act_freq = intel_rps_read_actual_frequency(rps); - if (act_freq > max_act_freq) - max_act_freq = act_freq; +static int max_granted_freq(struct intel_guc_slpc *slpc, struct intel_rps *rps, u32 *max_act_freq) +{ + struct intel_gt *gt = rps_to_gt(rps); + u32 perf_limit_reasons; + int err = 0;
- igt_spinner_end(&spin); - st_engine_heartbeat_enable(engine); - } + err = slpc_set_min_freq(slpc, slpc->rp0_freq); + if (err) + return err;
- pr_info("Max actual frequency for %s was %d\n", - engine->name, max_act_freq); + *max_act_freq = intel_rps_read_actual_frequency(rps); + if (!(*max_act_freq == slpc->rp0_freq)) { + /* Check if there was some throttling by pcode */ + perf_limit_reasons = intel_uncore_read(gt->uncore, GT0_PERF_LIMIT_REASONS);
- /* Actual frequency should rise above min */ - if (max_act_freq == slpc_min_freq) { - pr_err("Actual freq did not rise above min\n"); + /* If not, this is an error */ + if (!(perf_limit_reasons && GT0_PERF_LIMIT_REASONS_MASK)) { + pr_err("Pcode did not grant max freq\n"); err = -EINVAL; - } + } else { + pr_info("Pcode throttled frequency 0x%x\n", perf_limit_reasons);
- if (err) - break; + } }
- /* Restore min/max frequencies */ - slpc_set_max_freq(slpc, slpc_max_freq); - slpc_set_min_freq(slpc, slpc_min_freq); - - if (igt_flush_test(gt->i915)) - err = -EIO; - - intel_gt_pm_put(gt); - igt_spinner_fini(&spin); - intel_gt_pm_wait_for_idle(gt); - return err; }
-static int live_slpc_clamp_max(void *arg) +static int run_test(struct intel_gt *gt, int test_type) { - struct drm_i915_private *i915 = arg; - struct intel_gt *gt = to_gt(i915); - struct intel_guc_slpc *slpc; - struct intel_rps *rps; + struct intel_guc_slpc *slpc = >->uc.guc.slpc; + struct intel_rps *rps = >->rps; struct intel_engine_cs *engine; enum intel_engine_id id; struct igt_spinner spin; - int err = 0; u32 slpc_min_freq, slpc_max_freq; - - slpc = >->uc.guc.slpc; - rps = >->rps; + int err = 0;
if (!intel_uc_uses_guc_slpc(>->uc)) return 0; @@ -203,105 +176,122 @@ static int live_slpc_clamp_max(void *arg) intel_gt_pm_get(gt); for_each_engine(engine, gt, id) { struct i915_request *rq; - u32 max_freq, req_freq; - u32 act_freq, max_act_freq; - u32 step; + u32 max_act_freq;
if (!intel_engine_can_store_dword(engine)) continue;
- /* Go from max to min in 5 steps */ - step = (slpc_max_freq - slpc_min_freq) / NUM_STEPS; - max_act_freq = slpc_min_freq; - for (max_freq = slpc_max_freq; max_freq > slpc_min_freq; - max_freq -= step) { - err = slpc_set_max_freq(slpc, max_freq); - if (err) - break; - - st_engine_heartbeat_disable(engine); - - rq = igt_spinner_create_request(&spin, - engine->kernel_context, - MI_NOOP); - if (IS_ERR(rq)) { - st_engine_heartbeat_enable(engine); - err = PTR_ERR(rq); - break; - } + st_engine_heartbeat_disable(engine);
- i915_request_add(rq); + rq = igt_spinner_create_request(&spin, + engine->kernel_context, + MI_NOOP); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + st_engine_heartbeat_enable(engine); + break; + }
- if (!igt_wait_for_spinner(&spin, rq)) { - pr_err("%s: SLPC spinner did not start\n", - engine->name); - igt_spinner_end(&spin); - st_engine_heartbeat_enable(engine); - intel_gt_set_wedged(engine->gt); - err = -EIO; - break; - } + i915_request_add(rq); + + if (!igt_wait_for_spinner(&spin, rq)) { + pr_err("%s: Spinner did not start\n", + engine->name); + igt_spinner_end(&spin); + st_engine_heartbeat_enable(engine); + intel_gt_set_wedged(engine->gt); + err = -EIO; + break; + }
- delay_for_h2g(); + switch (test_type) {
- /* Verify that SWREQ indeed was set to specific value */ - req_freq = intel_rps_read_punit_req_frequency(rps); + case VARY_MIN: + err = vary_min_freq(slpc, rps, &max_act_freq); + break;
- /* GuC requests freq in multiples of 50/3 MHz */ - if (req_freq > (max_freq + FREQUENCY_REQ_UNIT)) { - pr_err("SWReq is %d, should be at most %d\n", req_freq, - max_freq + FREQUENCY_REQ_UNIT); + case VARY_MAX: + err = vary_max_freq(slpc, rps, &max_act_freq); + break; + + case MAX_GRANTED: + /* FIXME: Media engines have a different RP0 */ + if ((engine->class == VIDEO_DECODE_CLASS) || + (engine->class == VIDEO_ENHANCEMENT_CLASS)) { igt_spinner_end(&spin); st_engine_heartbeat_enable(engine); - err = -EINVAL; - break; + err = 0; + continue; }
- act_freq = intel_rps_read_actual_frequency(rps); - if (act_freq > max_act_freq) - max_act_freq = act_freq; - - st_engine_heartbeat_enable(engine); - igt_spinner_end(&spin); - - if (err) - break; + err = max_granted_freq(slpc, rps, &max_act_freq); + break; }
pr_info("Max actual frequency for %s was %d\n", engine->name, max_act_freq);
/* Actual frequency should rise above min */ - if (max_act_freq == slpc_min_freq) { + if (max_act_freq <= slpc_min_freq) { pr_err("Actual freq did not rise above min\n"); + pr_err("Perf Limit Reasons: 0x%x\n", + intel_uncore_read(gt->uncore, GT0_PERF_LIMIT_REASONS)); err = -EINVAL; }
- if (igt_flush_test(gt->i915)) { - err = -EIO; - break; - } + igt_spinner_end(&spin); + st_engine_heartbeat_enable(engine);
if (err) break; }
- /* Restore min/max freq */ + /* Restore min/max frequencies */ slpc_set_max_freq(slpc, slpc_max_freq); slpc_set_min_freq(slpc, slpc_min_freq);
+ if (igt_flush_test(gt->i915)) + err = -EIO; + intel_gt_pm_put(gt); igt_spinner_fini(&spin); intel_gt_pm_wait_for_idle(gt);
return err; + +} + +static int live_slpc_vary_min(void *arg) +{ + struct drm_i915_private *i915 = arg; + struct intel_gt *gt = to_gt(i915); + + return run_test(gt, VARY_MIN); +} + +static int live_slpc_vary_max(void *arg) +{ + struct drm_i915_private *i915 = arg; + struct intel_gt *gt = to_gt(i915); + + return run_test(gt, VARY_MAX); +} + +/* check if pcode can grant RP0 */ +static int live_slpc_max_granted(void *arg) +{ + struct drm_i915_private *i915 = arg; + struct intel_gt *gt = to_gt(i915); + + return run_test(gt, MAX_GRANTED); }
int intel_slpc_live_selftests(struct drm_i915_private *i915) { static const struct i915_subtest tests[] = { - SUBTEST(live_slpc_clamp_max), - SUBTEST(live_slpc_clamp_min), + SUBTEST(live_slpc_vary_max), + SUBTEST(live_slpc_vary_min), + SUBTEST(live_slpc_max_granted), };
if (intel_gt_is_wedged(to_gt(i915)))