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
10static 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
64out_rpm:
65	intel_runtime_pm_put(llc_to_gt(llc)->uncore->rpm, wakeref);
66	return err;
67}
68
69int st_llc_verify(struct intel_llc *llc)
70{
71	return gen6_verify_ring_freq(llc);
72}