Home | History | Annotate | Line # | Download | only in gt 
      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 
     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 
     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