1 /* 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright © 2019 Intel Corporation 5 */ 6 7 #include "intel_pm.h" /* intel_gpu_freq() */ 8 #include "selftest_llc.h" 9 #include "intel_rps.h" 10 11 static int gen6_verify_ring_freq(struct intel_llc *llc) 12 { 13 struct drm_i915_private *i915 = llc_to_gt(llc)->i915; 14 struct ia_constants consts; 15 intel_wakeref_t wakeref; 16 unsigned int gpu_freq; 17 int err = 0; 18 19 wakeref = intel_runtime_pm_get(llc_to_gt(llc)->uncore->rpm); 20 21 if (!get_ia_constants(llc, &consts)) { 22 err = -ENODEV; 23 goto out_rpm; 24 } 25 26 for (gpu_freq = consts.min_gpu_freq; 27 gpu_freq <= consts.max_gpu_freq; 28 gpu_freq++) { 29 struct intel_rps *rps = &llc_to_gt(llc)->rps; 30 31 unsigned int ia_freq, ring_freq, found; 32 u32 val; 33 34 calc_ia_freq(llc, gpu_freq, &consts, &ia_freq, &ring_freq); 35 36 val = gpu_freq; 37 if (sandybridge_pcode_read(i915, 38 GEN6_PCODE_READ_MIN_FREQ_TABLE, 39 &val, NULL)) { 40 pr_err("Failed to read freq table[%d], range [%d, %d]\n", 41 gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq); 42 err = -ENXIO; 43 break; 44 } 45 46 found = (val >> 0) & 0xff; 47 if (found != ia_freq) { 48 pr_err("Min freq table(%d/[%d, %d]):%dMHz did not match expected CPU freq, found %d, expected %d\n", 49 gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq, 50 intel_gpu_freq(rps, gpu_freq * (INTEL_GEN(i915) >= 9 ? GEN9_FREQ_SCALER : 1)), 51 found, ia_freq); 52 err = -EINVAL; 53 break; 54 } 55 56 found = (val >> 8) & 0xff; 57 if (found != ring_freq) { 58 pr_err("Min freq table(%d/[%d, %d]):%dMHz did not match expected ring freq, found %d, expected %d\n", 59 gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq, 60 intel_gpu_freq(rps, gpu_freq * (INTEL_GEN(i915) >= 9 ? GEN9_FREQ_SCALER : 1)), 61 found, ring_freq); 62 err = -EINVAL; 63 break; 64 } 65 } 66 67 out_rpm: 68 intel_runtime_pm_put(llc_to_gt(llc)->uncore->rpm, wakeref); 69 return err; 70 } 71 72 int st_llc_verify(struct intel_llc *llc) 73 { 74 int err = 0; 75 76 if (HAS_LLC(llc_to_gt(llc)->i915)) 77 err = gen6_verify_ring_freq(llc); 78 79 return err; 80 } 81