LXR linux/drivers/gpu/drm/i915/gt/selftest

   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
  11static 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                goto out_rpm;
  23
  24        for (gpu_freq = consts.min_gpu_freq;
  25             gpu_freq <= consts.max_gpu_freq;
  26             gpu_freq++) {
  27                struct intel_rps *rps = &llc_to_gt(llc)->rps;
  28
  29                unsigned int ia_freq, ring_freq, found;
  30                u32 val;
  31
  32                calc_ia_freq(llc, gpu_freq, &consts, &ia_freq, &ring_freq);
  33
  34                val = gpu_freq;
  35                if (sandybridge_pcode_read(i915,
  36                                           GEN6_PCODE_READ_MIN_FREQ_TABLE,
  37                                           &val, NULL)) {
  38                        pr_err("Failed to read freq table[%d], range [%d, %d]\n",
  39                               gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq);
  40                        err = -ENXIO;
  41                        break;
  42                }
  43
  44                found = (val >> 0) & 0xff;
  45                if (found != ia_freq) {
  46                        pr_err("Min freq table(%d/[%d, %d]):%dMHz did not match expected CPU freq, found %d, expected %d\n",
  47                               gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq,
  48                               intel_gpu_freq(rps, gpu_freq * (INTEL_GEN(i915) >= 9 ? GEN9_FREQ_SCALER : 1)),
  49                               found, ia_freq);
  50                        err = -EINVAL;
  51                        break;
  52                }
  53
  54                found = (val >> 8) & 0xff;
  55                if (found != ring_freq) {
  56                        pr_err("Min freq table(%d/[%d, %d]):%dMHz did not match expected ring freq, found %d, expected %d\n",
  57                               gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq,
  58                               intel_gpu_freq(rps, gpu_freq * (INTEL_GEN(i915) >= 9 ? GEN9_FREQ_SCALER : 1)),
  59                               found, ring_freq);
  60                        err = -EINVAL;
  61                        break;
  62                }
  63        }
  64
  65out_rpm:
  66        intel_runtime_pm_put(llc_to_gt(llc)->uncore->rpm, wakeref);
  67        return err;
  68}
  69
  70int st_llc_verify(struct intel_llc *llc)
  71{
  72        return gen6_verify_ring_freq(llc);
  73}
  74