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