1 /* $NetBSD: selftest_llc.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $ */
2
3 /*
4 * SPDX-License-Identifier: MIT
5 *
6 * Copyright © 2019 Intel Corporation
7 */
8
9 #include <sys/cdefs.h>
10 __KERNEL_RCSID(0, "$NetBSD: selftest_llc.c,v 1.2 2021/12/18 23:45:30 riastradh Exp $");
11
12 #include "intel_pm.h" /* intel_gpu_freq() */
13 #include "selftest_llc.h"
14 #include "intel_rps.h"
15
gen6_verify_ring_freq(struct intel_llc * llc)16 static int gen6_verify_ring_freq(struct intel_llc *llc)
17 {
18 struct drm_i915_private *i915 = llc_to_gt(llc)->i915;
19 struct ia_constants consts;
20 intel_wakeref_t wakeref;
21 unsigned int gpu_freq;
22 int err = 0;
23
24 wakeref = intel_runtime_pm_get(llc_to_gt(llc)->uncore->rpm);
25
26 if (!get_ia_constants(llc, &consts)) {
27 err = -ENODEV;
28 goto out_rpm;
29 }
30
31 for (gpu_freq = consts.min_gpu_freq;
32 gpu_freq <= consts.max_gpu_freq;
33 gpu_freq++) {
34 struct intel_rps *rps = &llc_to_gt(llc)->rps;
35
36 unsigned int ia_freq, ring_freq, found;
37 u32 val;
38
39 calc_ia_freq(llc, gpu_freq, &consts, &ia_freq, &ring_freq);
40
41 val = gpu_freq;
42 if (sandybridge_pcode_read(i915,
43 GEN6_PCODE_READ_MIN_FREQ_TABLE,
44 &val, NULL)) {
45 pr_err("Failed to read freq table[%d], range [%d, %d]\n",
46 gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq);
47 err = -ENXIO;
48 break;
49 }
50
51 found = (val >> 0) & 0xff;
52 if (found != ia_freq) {
53 pr_err("Min freq table(%d/[%d, %d]):%dMHz did not match expected CPU freq, found %d, expected %d\n",
54 gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq,
55 intel_gpu_freq(rps, gpu_freq * (INTEL_GEN(i915) >= 9 ? GEN9_FREQ_SCALER : 1)),
56 found, ia_freq);
57 err = -EINVAL;
58 break;
59 }
60
61 found = (val >> 8) & 0xff;
62 if (found != ring_freq) {
63 pr_err("Min freq table(%d/[%d, %d]):%dMHz did not match expected ring freq, found %d, expected %d\n",
64 gpu_freq, consts.min_gpu_freq, consts.max_gpu_freq,
65 intel_gpu_freq(rps, gpu_freq * (INTEL_GEN(i915) >= 9 ? GEN9_FREQ_SCALER : 1)),
66 found, ring_freq);
67 err = -EINVAL;
68 break;
69 }
70 }
71
72 out_rpm:
73 intel_runtime_pm_put(llc_to_gt(llc)->uncore->rpm, wakeref);
74 return err;
75 }
76
st_llc_verify(struct intel_llc * llc)77 int st_llc_verify(struct intel_llc *llc)
78 {
79 int err = 0;
80
81 if (HAS_LLC(llc_to_gt(llc)->i915))
82 err = gen6_verify_ring_freq(llc);
83
84 return err;
85 }
86