LXR linux/drivers/gpu/drm/i915/gt/uc/selftest

   1// SPDX-License-Identifier: MIT
   2/*
   3 * Copyright �� 2021 Intel Corporation
   4 */
   5
   6#include "selftests/intel_scheduler_helpers.h"
   7
   8static struct i915_request *nop_user_request(struct intel_context *ce,
   9                                             struct i915_request *from)
  10{
  11        struct i915_request *rq;
  12        int ret;
  13
  14        rq = intel_context_create_request(ce);
  15        if (IS_ERR(rq))
  16                return rq;
  17
  18        if (from) {
  19                ret = i915_sw_fence_await_dma_fence(&rq->submit,
  20                                                    &from->fence, 0,
  21                                                    I915_FENCE_GFP);
  22                if (ret < 0) {
  23                        i915_request_put(rq);
  24                        return ERR_PTR(ret);
  25                }
  26        }
  27
  28        i915_request_get(rq);
  29        i915_request_add(rq);
  30
  31        return rq;
  32}
  33
  34static int intel_guc_scrub_ctbs(void *arg)
  35{
  36        struct intel_gt *gt = arg;
  37        int ret = 0;
  38        int i;
  39        struct i915_request *last[3] = {NULL, NULL, NULL}, *rq;
  40        intel_wakeref_t wakeref;
  41        struct intel_engine_cs *engine;
  42        struct intel_context *ce;
  43
  44        wakeref = intel_runtime_pm_get(gt->uncore->rpm);
  45        engine = intel_selftest_find_any_engine(gt);
  46
  47        /* Submit requests and inject errors forcing G2H to be dropped */
  48        for (i = 0; i < 3; ++i) {
  49                ce = intel_context_create(engine);
  50                if (IS_ERR(ce)) {
  51                        ret = PTR_ERR(ce);
  52                        pr_err("Failed to create context, %d: %d\n", i, ret);
  53                        goto err;
  54                }
  55
  56                switch (i) {
  57                case 0:
  58                        ce->drop_schedule_enable = true;
  59                        break;
  60                case 1:
  61                        ce->drop_schedule_disable = true;
  62                        break;
  63                case 2:
  64                        ce->drop_deregister = true;
  65                        break;
  66                }
  67
  68                rq = nop_user_request(ce, NULL);
  69                intel_context_put(ce);
  70
  71                if (IS_ERR(rq)) {
  72                        ret = PTR_ERR(rq);
  73                        pr_err("Failed to create request, %d: %d\n", i, ret);
  74                        goto err;
  75                }
  76
  77                last[i] = rq;
  78        }
  79
  80        for (i = 0; i < 3; ++i) {
  81                ret = i915_request_wait(last[i], 0, HZ);
  82                if (ret < 0) {
  83                        pr_err("Last request failed to complete: %d\n", ret);
  84                        goto err;
  85                }
  86                i915_request_put(last[i]);
  87                last[i] = NULL;
  88        }
  89
  90        /* Force all H2G / G2H to be submitted / processed */
  91        intel_gt_retire_requests(gt);
  92        msleep(500);
  93
  94        /* Scrub missing G2H */
  95        intel_gt_handle_error(engine->gt, -1, 0, "selftest reset");
  96
  97        /* GT will not idle if G2H are lost */
  98        ret = intel_gt_wait_for_idle(gt, HZ);
  99        if (ret < 0) {
 100                pr_err("GT failed to idle: %d\n", ret);
 101                goto err;
 102        }
 103
 104err:
 105        for (i = 0; i < 3; ++i)
 106                if (last[i])
 107                        i915_request_put(last[i]);
 108        intel_runtime_pm_put(gt->uncore->rpm, wakeref);
 109
 110        return ret;
 111}
 112
 113int intel_guc_live_selftests(struct drm_i915_private *i915)
 114{
 115        static const struct i915_subtest tests[] = {
 116                SUBTEST(intel_guc_scrub_ctbs),
 117        };
 118        struct intel_gt *gt = &i915->gt;
 119
 120        if (intel_gt_is_wedged(gt))
 121                return 0;
 122
 123        if (!intel_uc_uses_guc_submission(&gt->uc))
 124                return 0;
 125
 126        return intel_gt_live_subtests(tests, gt);
 127}
 128