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 drm_i915_private *i915 = gvt->dev_priv;
  62         struct mmio_diff_param *param = data;
  63         struct diff_mmio *node;
  64         u32 preg, vreg;
  65
  66         preg = intel_uncore_read_notrace(&i915->uncore, _MMIO(offset));
  67         vreg = vgpu_vreg(param->vgpu, offset);
  68
  69         if (preg != vreg) {
  70                 node = kmalloc(sizeof(*node), GFP_KERNEL);
  71                 if (!node)
  72                         return -ENOMEM;
  73
  74                 node->offset = offset;
  75                 node->preg = preg;
  76                 node->vreg = vreg;
  77                 list_add(&node->node, &param->diff_mmio_list);
  78                 param->diff++;
  79         }
  80         param->total++;
  81         return 0;
  82 }
  83
  84 /* Show the all the different values of tracked mmio. */
  85 static int vgpu_mmio_diff_show(struct seq_file *s, void *unused)
  86 {
  87         struct intel_vgpu *vgpu = s->private;
  88         struct intel_gvt *gvt = vgpu->gvt;
  89         struct mmio_diff_param param = {
  90                 .vgpu = vgpu,
  91                 .total = 0,
  92                 .diff = 0,
  93         };
  94         struct diff_mmio *node, *next;
  95
  96         INIT_LIST_HEAD(&param.diff_mmio_list);
  97
  98         mutex_lock(&gvt->lock);
  99         spin_lock_bh(&gvt->scheduler.mmio_context_lock);
 100
 101         mmio_hw_access_pre(gvt->dev_priv);
 102         /* Recognize all the diff mmios to list. */
 103         intel_gvt_for_each_tracked_mmio(gvt, mmio_diff_handler, &param);
 104         mmio_hw_access_post(gvt->dev_priv);
 105
 106         spin_unlock_bh(&gvt->scheduler.mmio_context_lock);
 107         mutex_unlock(&gvt->lock);
 108
 109         /* In an ascending order by mmio offset. */
 110         list_sort(NULL, &param.diff_mmio_list, mmio_offset_compare);
 111
 112         seq_printf(s, "%-8s %-8s %-8s %-8s\n", "Offset", "HW", "vGPU", "Diff");
 113         list_for_each_entry_safe(node, next, &param.diff_mmio_list, node) {
 114                 u32 diff = node->preg ^ node->vreg;
 115
 116                 seq_printf(s, "%08x %08x %08x %*pbl\n",
 117                            node->offset, node->preg, node->vreg,
 118                            32, &diff);
 119                 list_del(&node->node);
 120                 kfree(node);
 121         }
 122         seq_printf(s, "Total: %d, Diff: %d\n", param.total, param.diff);
 123         return 0;
 124 }
 125 DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff);
 126
 127 static int
 128 vgpu_scan_nonprivbb_get(void *data, u64 *val)
 129 {
 130         struct intel_vgpu *vgpu = (struct intel_vgpu *)data;
 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         struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv;
 146         enum intel_engine_id id;
 147         char buf[128], *s;
 148         int len;
 149
 150         val &= (1 << I915_NUM_ENGINES) - 1;
 151
 152         if (vgpu->scan_nonprivbb == val)
 153                 return 0;
 154
 155         if (!val)
 156                 goto done;
 157
 158         len = sprintf(buf,
 159                 "gvt: vgpu %d turns on non-privileged batch buffers scanning on Engines:",
 160                 vgpu->id);
 161
 162         s = buf + len;
 163
 164         for (id = 0; id < I915_NUM_ENGINES; id++) {
 165                 struct intel_engine_cs *engine;
 166
 167                 engine = dev_priv->engine[id];
 168                 if (engine && (val & (1 << id))) {
 169                         len = snprintf(s, 4, "%d, ", engine->id);
 170                         s += len;
 171                 } else
 172                         val &=  ~(1 << id);
 173         }
 174
 175         if (val)
 176                 sprintf(s, "low performance expected.");
 177
 178         pr_warn("%s\n", buf);
 179
 180 done:
 181         vgpu->scan_nonprivbb = val;
 182         return 0;
 183 }
 184
 185 DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops,
 186                         vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set,
 187                         "0x%llx\n");
 188
 189 /**
 190  * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU
 191  * @vgpu: a vGPU
 192  */
 193 void intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu)
 194 {
 195         char name[16] = "";
 196
 197         snprintf(name, 16, "vgpu%d", vgpu->id);
 198         vgpu->debugfs = debugfs_create_dir(name, vgpu->gvt->debugfs_root);
 199
 200         debugfs_create_bool("active", 0444, vgpu->debugfs, &vgpu->active);
 201         debugfs_create_file("mmio_diff", 0444, vgpu->debugfs, vgpu,
 202                             &vgpu_mmio_diff_fops);
 203         debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, vgpu,
 204                             &vgpu_scan_nonprivbb_fops);
 205 }
 206
 207 /**
 208  * intel_gvt_debugfs_remove_vgpu - remove debugfs entries of a vGPU
 209  * @vgpu: a vGPU
 210  */
 211 void intel_gvt_debugfs_remove_vgpu(struct intel_vgpu *vgpu)
 212 {
 213         debugfs_remove_recursive(vgpu->debugfs);
 214         vgpu->debugfs = NULL;
 215 }
 216
 217 /**
 218  * intel_gvt_debugfs_init - register gvt debugfs root entry
 219  * @gvt: GVT device
 220  */
 221 void intel_gvt_debugfs_init(struct intel_gvt *gvt)
 222 {
 223         struct drm_minor *minor = gvt->dev_priv->drm.primary;
 224
 225         gvt->debugfs_root = debugfs_create_dir("gvt", minor->debugfs_root);
 226
 227         debugfs_create_ulong("num_tracked_mmio", 0444, gvt->debugfs_root,
 228                              &gvt->mmio.num_tracked_mmio);
 229 }
 230
 231 /**
 232  * intel_gvt_debugfs_clean - remove debugfs entries
 233  * @gvt: GVT device
 234  */
 235 void intel_gvt_debugfs_clean(struct intel_gvt *gvt)
 236 {
 237         debugfs_remove_recursive(gvt->debugfs_root);
 238         gvt->debugfs_root = NULL;
 239 }