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