Quelle  i915_drm_client.c   Sprache: C

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2020 Intel Corporation
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/types.h>

#include <uapi/drm/i915_drm.h>

#include <drm/drm_print.h>

#include "gem/i915_gem_context.h"
#include "i915_drm_client.h"
#include "i915_file_private.h"
#include "i915_gem.h"
#include "i915_utils.h"

struct i915_drm_client *i915_drm_client_alloc(void)
{
 struct i915_drm_client *client;

 client = kzalloc(sizeof(*client), GFP_KERNEL);
 if (!client)
  return NULL;

 kref_init(&client->kref);
 spin_lock_init(&client->ctx_lock);
 INIT_LIST_HEAD(&client->ctx_list);
#ifdef CONFIG_PROC_FS
 spin_lock_init(&client->objects_lock);
 INIT_LIST_HEAD(&client->objects_list);
#endif

 return client;
}

void __i915_drm_client_free(struct kref *kref)
{
 struct i915_drm_client *client =
  container_of(kref, typeof(*client), kref);

 kfree(client);
}

#ifdef CONFIG_PROC_FS
static void
obj_meminfo(struct drm_i915_gem_object *obj,
     struct drm_memory_stats stats[INTEL_REGION_UNKNOWN])
{
 const enum intel_region_id id = obj->mm.region ?
     obj->mm.region->id : INTEL_REGION_SMEM;
 const u64 sz = obj->base.size;

 if (drm_gem_object_is_shared_for_memory_stats(&obj->base))
  stats[id].shared += sz;
 else
  stats[id].private += sz;

 if (i915_gem_object_has_pages(obj)) {
  stats[id].resident += sz;

  if (!dma_resv_test_signaled(obj->base.resv,
         DMA_RESV_USAGE_BOOKKEEP))
   stats[id].active += sz;
  else if (i915_gem_object_is_shrinkable(obj) &&
    obj->mm.madv == I915_MADV_DONTNEED)
   stats[id].purgeable += sz;
 }
}

static void show_meminfo(struct drm_printer *p, struct drm_file *file)
{
 struct drm_memory_stats stats[INTEL_REGION_UNKNOWN] = {};
 struct drm_i915_file_private *fpriv = file->driver_priv;
 struct i915_drm_client *client = fpriv->client;
 struct drm_i915_private *i915 = fpriv->i915;
 struct drm_i915_gem_object *obj;
 struct intel_memory_region *mr;
 struct list_head __rcu *pos;
 unsigned int id;

 /* Public objects. */
 spin_lock(&file->table_lock);
 idr_for_each_entry(&file->object_idr, obj, id)
  obj_meminfo(obj, stats);
 spin_unlock(&file->table_lock);

 /* Internal objects. */
 rcu_read_lock();
 list_for_each_rcu(pos, &client->objects_list) {
  obj = i915_gem_object_get_rcu(list_entry(pos, typeof(*obj),
        client_link));
  if (!obj)
   continue;
  obj_meminfo(obj, stats);
  i915_gem_object_put(obj);
 }
 rcu_read_unlock();

 for_each_memory_region(mr, i915, id)
  drm_print_memory_stats(p,
           &stats[id],
           DRM_GEM_OBJECT_ACTIVE |
           DRM_GEM_OBJECT_RESIDENT |
           DRM_GEM_OBJECT_PURGEABLE,
           mr->uabi_name);
}

static const char * const uabi_class_names[] = {
 [I915_ENGINE_CLASS_RENDER] = "render",
 [I915_ENGINE_CLASS_COPY] = "copy",
 [I915_ENGINE_CLASS_VIDEO] = "video",
 [I915_ENGINE_CLASS_VIDEO_ENHANCE] = "video-enhance",
 [I915_ENGINE_CLASS_COMPUTE] = "compute",
};

static u64 busy_add(struct i915_gem_context *ctx, unsigned int class)
{
 struct i915_gem_engines_iter it;
 struct intel_context *ce;
 u64 total = 0;

 for_each_gem_engine(ce, rcu_dereference(ctx->engines), it) {
  if (ce->engine->uabi_class != class)
   continue;

  total += intel_context_get_total_runtime_ns(ce);
 }

 return total;
}

static void
show_client_class(struct drm_printer *p,
    struct drm_i915_private *i915,
    struct i915_drm_client *client,
    unsigned int class)
{
 const unsigned int capacity = i915->engine_uabi_class_count[class];
 u64 total = atomic64_read(&client->past_runtime[class]);
 struct i915_gem_context *ctx;

 rcu_read_lock();
 list_for_each_entry_rcu(ctx, &client->ctx_list, client_link)
  total += busy_add(ctx, class);
 rcu_read_unlock();

 if (capacity)
  drm_printf(p, "drm-engine-%s:\t%llu ns\n",
      uabi_class_names[class], total);

 if (capacity > 1)
  drm_printf(p, "drm-engine-capacity-%s:\t%u\n",
      uabi_class_names[class],
      capacity);
}

void i915_drm_client_fdinfo(struct drm_printer *p, struct drm_file *file)
{
 struct drm_i915_file_private *file_priv = file->driver_priv;
 struct drm_i915_private *i915 = file_priv->i915;
 unsigned int i;

 /*
 * ******************************************************************
 * For text output format description please see drm-usage-stats.rst!
 * ******************************************************************
 */

 show_meminfo(p, file);

 if (GRAPHICS_VER(i915) < 8)
  return;

 for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++)
  show_client_class(p, i915, file_priv->client, i);
}

void i915_drm_client_add_object(struct i915_drm_client *client,
    struct drm_i915_gem_object *obj)
{
 unsigned long flags;

 GEM_WARN_ON(obj->client);
 GEM_WARN_ON(!list_empty(&obj->client_link));

 spin_lock_irqsave(&client->objects_lock, flags);
 obj->client = i915_drm_client_get(client);
 list_add_tail_rcu(&obj->client_link, &client->objects_list);
 spin_unlock_irqrestore(&client->objects_lock, flags);
}

void i915_drm_client_remove_object(struct drm_i915_gem_object *obj)
{
 struct i915_drm_client *client = fetch_and_zero(&obj->client);
 unsigned long flags;

 /* Object may not be associated with a client. */
 if (!client)
  return;

 spin_lock_irqsave(&client->objects_lock, flags);
 list_del_rcu(&obj->client_link);
 spin_unlock_irqrestore(&client->objects_lock, flags);

 i915_drm_client_put(client);
}

void i915_drm_client_add_context_objects(struct i915_drm_client *client,
      struct intel_context *ce)
{
 if (ce->state)
  i915_drm_client_add_object(client, ce->state->obj);

 if (ce->ring != ce->engine->legacy.ring && ce->ring->vma)
  i915_drm_client_add_object(client, ce->ring->vma->obj);
}
#endif