drivers/gpu/drm/i915/gt/selftest_llc.c

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