drivers/gpu/drm/i915/gvt/debugfs.c

   1 /*
   2  * Copyright(c) 2011-2017 Intel Corporation. All rights reserved.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23 #include <linux/debugfs.h>
  24 #include <linux/list_sort.h>
  25 #include "i915_drv.h"
  26 #include "gvt.h"
  27
  28 struct mmio_diff_param {
  29         struct intel_vgpu *vgpu;
  30         int total;
  31         int diff;
  32         struct list_head diff_mmio_list;
  33 };
  34
  35 struct diff_mmio {
  36         struct list_head node;
  37         u32 offset;
  38         u32 preg;
  39         u32 vreg;
  40 };
  41
  42 /* Compare two diff_mmio items. */
  43 static int mmio_offset_compare(void *priv,
  44         struct list_head *a, struct list_head *b)
  45 {
  46         struct diff_mmio *ma;
  47         struct diff_mmio *mb;
  48
  49         ma = container_of(a, struct diff_mmio, node);
  50         mb = container_of(b, struct diff_mmio, node);
  51         if (ma->offset < mb->offset)
  52                 return -1;
  53         else if (ma->offset > mb->offset)
  54                 return 1;
  55         return 0;
  56 }
  57
  58 static inline int mmio_diff_handler(struct intel_gvt *gvt,
  59                                     u32 offset, void *data)
  60 {
  61         struct mmio_diff_param *param = data;
  62         struct diff_mmio *node;
  63         u32 preg, vreg;
  64
  65         preg = intel_uncore_read_notrace(gvt->gt->uncore, _MMIO(offset));
  66         vreg = vgpu_vreg(param->vgpu, offset);
  67
  68         if (preg != vreg) {
  69                 node = kmalloc(sizeof(*node), GFP_ATOMIC);
  70                 if (!node)
  71                         return -ENOMEM;
  72
  73                 node->offset = offset;
  74                 node->preg = preg;
  75                 node->vreg = vreg;
  76                 list_add(&node->node, &param->diff_mmio_list);
  77                 param->diff++;
  78         }
  79         param->total++;
  80         return 0;
  81 }
  82
  83 /* Show the all the different values of tracked mmio. */
  84 static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
  85 {
  86         struct intel_vgpu *vgpu = s->private;
  87         struct intel_gvt *gvt = vgpu->gvt;
  88         struct mmio_diff_param param = {
  89                 .vgpu = vgpu,
  90                 .total = 0,
  91                 .diff = 0,
  92         };
  93         struct diff_mmio *node, *next;
  94
  95         INIT_LIST_HEAD(&param.diff_mmio_list);
  96
  97         mutex_lock(&gvt->lock);
  98         spin_lock_bh(&gvt->scheduler.mmio_context_lock);
  99
 100         mmio_hw_access_pre(gvt->gt);
 101         /* Recognize all the diff mmios to list. */
 102         intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, &param);
 103         mmio_hw_access_post(gvt->gt);
 104
 105         spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
 106         mutex_unlock(&gvt->lock);
 107
 108         /* In an ascending order by mmio offset. */
 109         list_sort(NULL, &param.diff_mmio_list, mmio_offset_compare);
 110
 111         seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
 112         list_for_each_entry_safe(node, next, &param.diff_mmio_list, node) {
 113                 u32 diff = node->preg ^ node->vreg;
 114
 115                 seq_printf(s, "%08x %08x %08x %*pbl\n",
 116                            node->offset, node->preg, node->vreg,
 117                            32, &diff);
 118                 list_del(&node->node);
 119                 kfree(node);
 120         }
 121         seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
 122         return 0;
 123 }
 124 DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
 125
 126 static int
 127 vgpu_scan_nonprivbb_get(void *data, u64 *val)
 128 {
 129         struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
 130
 131         *val = vgpu->scan_nonprivbb;
 132         return 0;
 133 }
 134
 135 /*
 136  * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning
 137  * of non-privileged batch buffer. e.g.
 138  * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer
 139  * on engine 0 and 1.
 140  */
 141 static int
 142 vgpu_scan_nonprivbb_set(void *data, u64 val)
 143 {
 144         struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
 145
 146         vgpu->scan_nonprivbb = val;
 147         return 0;
 148 }
 149
 150 DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
 151                         vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
 152                         "0x%llx\n");
 153
 154 /**
 155  * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
 156  * @vgpu: a vGPU
 157  */
 158 void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
 159 {
 160         char name[16] = "";
 161
 162         snprintf(name, 16, "vgpu%d", vgpu->id);
 163         vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
 164
 165         debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active);
 166         debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
 167                             &vgpu_mmio_diff_fops);
 168         debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
 169                             &vgpu_scan_nonprivbb_fops);
 170 }
 171
 172 /**
 173  * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
 174  * @vgpu: a vGPU
 175  */
 176 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
 177 {
 178         debugfs_remove_recursive(vgpu->debugfs);
 179         vgpu->debugfs = NULL;
 180 }
 181
 182 /**
 183  * intel_gvt_debugfs_init - register gvt debugfs root entry
 184  * @gvt: GVT device
 185  */
 186 void intel_gvt_debugfs_init(struct intel_gvt *gvt)
 187 {
 188         struct drm_minor *minor = gvt->gt->i915->drm.primary;
 189
 190         gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
 191
 192         debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
 193                              &gvt->mmio.num_tracked_mmio);
 194 }
 195
 196 /**
 197  * intel_gvt_debugfs_clean - remove debugfs entries
 198  * @gvt: GVT device
 199  */
 200 void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
 201 {
 202         debugfs_remove_recursive(gvt->debugfs_root);
 203         gvt->debugfs_root = NULL;
 204 }