drivers/gpu/drm/msm/msm_submitqueue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright (c) 2017 The Linux Foundation. All rights reserved.
   3  */
   4
   5 #include <linux/kref.h>
   6 #include <linux/uaccess.h>
   7
   8 #include "msm_gpu.h"
   9
  10 int msm_file_private_set_sysprof(struct msm_file_private *ctx,
  11                                  struct msm_gpu *gpu, int sysprof)
  12 {
  13         /*
  14          * Since pm_runtime and sysprof_active are both refcounts, we
  15          * call apply the new value first, and then unwind the previous
  16          * value
  17          */
  18
  19         switch (sysprof) {
  20         default:
  21                 return -EINVAL;
  22         case 2:
  23                 pm_runtime_get_sync(&gpu->pdev->dev);
  24                 fallthrough;
  25         case 1:
  26                 refcount_inc(&gpu->sysprof_active);
  27                 fallthrough;
  28         case 0:
  29                 break;
  30         }
  31
  32         /* unwind old value: */
  33         switch (ctx->sysprof) {
  34         case 2:
  35                 pm_runtime_put_autosuspend(&gpu->pdev->dev);
  36                 fallthrough;
  37         case 1:
  38                 refcount_dec(&gpu->sysprof_active);
  39                 fallthrough;
  40         case 0:
  41                 break;
  42         }
  43
  44         ctx->sysprof = sysprof;
  45
  46         return 0;
  47 }
  48
  49 void __msm_file_private_destroy(struct kref *kref)
  50 {
  51         struct msm_file_private *ctx = container_of(kref,
  52                 struct msm_file_private, ref);
  53         int i;
  54
  55         for (i = 0; i < ARRAY_SIZE(ctx->entities); i++) {
  56                 if (!ctx->entities[i])
  57                         continue;
  58
  59                 drm_sched_entity_destroy(ctx->entities[i]);
  60                 kfree(ctx->entities[i]);
  61         }
  62
  63         msm_gem_address_space_put(ctx->aspace);
  64         kfree(ctx->comm);
  65         kfree(ctx->cmdline);
  66         kfree(ctx);
  67 }
  68
  69 void msm_submitqueue_destroy(struct kref *kref)
  70 {
  71         struct msm_gpu_submitqueue *queue = container_of(kref,
  72                 struct msm_gpu_submitqueue, ref);
  73
  74         idr_destroy(&queue->fence_idr);
  75
  76         msm_file_private_put(queue->ctx);
  77
  78         kfree(queue);
  79 }
  80
  81 struct msm_gpu_submitqueue *msm_submitqueue_get(struct msm_file_private *ctx,
  82                 u32 id)
  83 {
  84         struct msm_gpu_submitqueue *entry;
  85
  86         if (!ctx)
  87                 return NULL;
  88
  89         read_lock(&ctx->queuelock);
  90
  91         list_for_each_entry(entry, &ctx->submitqueues, node) {
  92                 if (entry->id == id) {
  93                         kref_get(&entry->ref);
  94                         read_unlock(&ctx->queuelock);
  95
  96                         return entry;
  97                 }
  98         }
  99
 100         read_unlock(&ctx->queuelock);
 101         return NULL;
 102 }
 103
 104 void msm_submitqueue_close(struct msm_file_private *ctx)
 105 {
 106         struct msm_gpu_submitqueue *entry, *tmp;
 107
 108         if (!ctx)
 109                 return;
 110
 111         /*
 112          * No lock needed in close and there won't
 113          * be any more user ioctls coming our way
 114          */
 115         list_for_each_entry_safe(entry, tmp, &ctx->submitqueues, node) {
 116                 list_del(&entry->node);
 117                 msm_submitqueue_put(entry);
 118         }
 119 }
 120
 121 static struct drm_sched_entity *
 122 get_sched_entity(struct msm_file_private *ctx, struct msm_ringbuffer *ring,
 123                  unsigned ring_nr, enum drm_sched_priority sched_prio)
 124 {
 125         static DEFINE_MUTEX(entity_lock);
 126         unsigned idx = (ring_nr * NR_SCHED_PRIORITIES) + sched_prio;
 127
 128         /* We should have already validated that the requested priority is
 129          * valid by the time we get here.
 130          */
 131         if (WARN_ON(idx >= ARRAY_SIZE(ctx->entities)))
 132                 return ERR_PTR(-EINVAL);
 133
 134         mutex_lock(&entity_lock);
 135
 136         if (!ctx->entities[idx]) {
 137                 struct drm_sched_entity *entity;
 138                 struct drm_gpu_scheduler *sched = &ring->sched;
 139                 int ret;
 140
 141                 entity = kzalloc(sizeof(*ctx->entities[idx]), GFP_KERNEL);
 142
 143                 ret = drm_sched_entity_init(entity, sched_prio, &sched, 1, NULL);
 144                 if (ret) {
 145                         mutex_unlock(&entity_lock);
 146                         kfree(entity);
 147                         return ERR_PTR(ret);
 148                 }
 149
 150                 ctx->entities[idx] = entity;
 151         }
 152
 153         mutex_unlock(&entity_lock);
 154
 155         return ctx->entities[idx];
 156 }
 157
 158 int msm_submitqueue_create(struct drm_device *drm, struct msm_file_private *ctx,
 159                 u32 prio, u32 flags, u32 *id)
 160 {
 161         struct msm_drm_private *priv = drm->dev_private;
 162         struct msm_gpu_submitqueue *queue;
 163         enum drm_sched_priority sched_prio;
 164         unsigned ring_nr;
 165         int ret;
 166
 167         if (!ctx)
 168                 return -ENODEV;
 169
 170         if (!priv->gpu)
 171                 return -ENODEV;
 172
 173         ret = msm_gpu_convert_priority(priv->gpu, prio, &ring_nr, &sched_prio);
 174         if (ret)
 175                 return ret;
 176
 177         queue = kzalloc(sizeof(*queue), GFP_KERNEL);
 178
 179         if (!queue)
 180                 return -ENOMEM;
 181
 182         kref_init(&queue->ref);
 183         queue->flags = flags;
 184         queue->ring_nr = ring_nr;
 185
 186         queue->entity = get_sched_entity(ctx, priv->gpu->rb[ring_nr],
 187                                          ring_nr, sched_prio);
 188         if (IS_ERR(queue->entity)) {
 189                 ret = PTR_ERR(queue->entity);
 190                 kfree(queue);
 191                 return ret;
 192         }
 193
 194         write_lock(&ctx->queuelock);
 195
 196         queue->ctx = msm_file_private_get(ctx);
 197         queue->id = ctx->queueid++;
 198
 199         if (id)
 200                 *id = queue->id;
 201
 202         idr_init(&queue->fence_idr);
 203         mutex_init(&queue->lock);
 204
 205         list_add_tail(&queue->node, &ctx->submitqueues);
 206
 207         write_unlock(&ctx->queuelock);
 208
 209         return 0;
 210 }
 211
 212 /*
 213  * Create the default submit-queue (id==0), used for backwards compatibility
 214  * for userspace that pre-dates the introduction of submitqueues.
 215  */
 216 int msm_submitqueue_init(struct drm_device *drm, struct msm_file_private *ctx)
 217 {
 218         struct msm_drm_private *priv = drm->dev_private;
 219         int default_prio, max_priority;
 220
 221         if (!priv->gpu)
 222                 return -ENODEV;
 223
 224         max_priority = (priv->gpu->nr_rings * NR_SCHED_PRIORITIES) - 1;
 225
 226         /*
 227          * Pick a medium priority level as default.  Lower numeric value is
 228          * higher priority, so round-up to pick a priority that is not higher
 229          * than the middle priority level.
 230          */
 231         default_prio = DIV_ROUND_UP(max_priority, 2);
 232
 233         return msm_submitqueue_create(drm, ctx, default_prio, 0, NULL);
 234 }
 235
 236 static int msm_submitqueue_query_faults(struct msm_gpu_submitqueue *queue,
 237                 struct drm_msm_submitqueue_query *args)
 238 {
 239         size_t size = min_t(size_t, args->len, sizeof(queue->faults));
 240         int ret;
 241
 242         /* If a zero length was passed in, return the data size we expect */
 243         if (!args->len) {
 244                 args->len = sizeof(queue->faults);
 245                 return 0;
 246         }
 247
 248         /* Set the length to the actual size of the data */
 249         args->len = size;
 250
 251         ret = copy_to_user(u64_to_user_ptr(args->data), &queue->faults, size);
 252
 253         return ret ? -EFAULT : 0;
 254 }
 255
 256 int msm_submitqueue_query(struct drm_device *drm, struct msm_file_private *ctx,
 257                 struct drm_msm_submitqueue_query *args)
 258 {
 259         struct msm_gpu_submitqueue *queue;
 260         int ret = -EINVAL;
 261
 262         if (args->pad)
 263                 return -EINVAL;
 264
 265         queue = msm_submitqueue_get(ctx, args->id);
 266         if (!queue)
 267                 return -ENOENT;
 268
 269         if (args->param == MSM_SUBMITQUEUE_PARAM_FAULTS)
 270                 ret = msm_submitqueue_query_faults(queue, args);
 271
 272         msm_submitqueue_put(queue);
 273
 274         return ret;
 275 }
 276
 277 int msm_submitqueue_remove(struct msm_file_private *ctx, u32 id)
 278 {
 279         struct msm_gpu_submitqueue *entry;
 280
 281         if (!ctx)
 282                 return 0;
 283
 284         /*
 285          * id 0 is the "default" queue and can't be destroyed
 286          * by the user
 287          */
 288         if (!id)
 289                 return -ENOENT;
 290
 291         write_lock(&ctx->queuelock);
 292
 293         list_for_each_entry(entry, &ctx->submitqueues, node) {
 294                 if (entry->id == id) {
 295                         list_del(&entry->node);
 296                         write_unlock(&ctx->queuelock);
 297
 298                         msm_submitqueue_put(entry);
 299                         return 0;
 300                 }
 301         }
 302
 303         write_unlock(&ctx->queuelock);
 304         return -ENOENT;
 305 }
 306