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 
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(i915, 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 
68 int st_llc_verify(struct intel_llc *llc)
69 {
70 	return gen6_verify_ring_freq(llc);
71 }
72