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
gen6_verify_ring_freq(struct intel_llc * llc)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 * (GRAPHICS_VER(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 * (GRAPHICS_VER(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
st_llc_verify(struct intel_llc * llc)69 int st_llc_verify(struct intel_llc *llc)
70 {
71 return gen6_verify_ring_freq(llc);
72 }
73