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
gen6_verify_ring_freq(struct intel_llc * llc)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 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
65 out_rpm:
66 intel_runtime_pm_put(llc_to_gt(llc)->uncore->rpm, wakeref);
67 return err;
68 }
69
st_llc_verify(struct intel_llc * llc)70 int st_llc_verify(struct intel_llc *llc)
71 {
72 return gen6_verify_ring_freq(llc);
73 }
74
