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