drivers/gpu/drm/i915/i915_drm_client.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2020 Intel Corporation
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/slab.h>
   8 #include <linux/types.h>
   9
  10 #include <uapi/drm/i915_drm.h>
  11
  12 #include <drm/drm_print.h>
  13
  14 #include "gem/i915_gem_context.h"
  15 #include "i915_drm_client.h"
  16 #include "i915_file_private.h"
  17 #include "i915_gem.h"
  18 #include "i915_utils.h"
  19
  20 void i915_drm_clients_init(struct i915_drm_clients *clients,
  21                            struct drm_i915_private *i915)
  22 {
  23         clients->i915 = i915;
  24         clients->next_id = 0;
  25
  26         xa_init_flags(&clients->xarray, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);
  27 }
  28
  29 struct i915_drm_client *i915_drm_client_add(struct i915_drm_clients *clients)
  30 {
  31         struct i915_drm_client *client;
  32         struct xarray *xa = &clients->xarray;
  33         int ret;
  34
  35         client = kzalloc(sizeof(*client), GFP_KERNEL);
  36         if (!client)
  37                 return ERR_PTR(-ENOMEM);
  38
  39         xa_lock_irq(xa);
  40         ret = __xa_alloc_cyclic(xa, &client->id, client, xa_limit_32b,
  41                                 &clients->next_id, GFP_KERNEL);
  42         xa_unlock_irq(xa);
  43         if (ret < 0)
  44                 goto err;
  45
  46         kref_init(&client->kref);
  47         spin_lock_init(&client->ctx_lock);
  48         INIT_LIST_HEAD(&client->ctx_list);
  49         client->clients = clients;
  50
  51         return client;
  52
  53 err:
  54         kfree(client);
  55
  56         return ERR_PTR(ret);
  57 }
  58
  59 void __i915_drm_client_free(struct kref *kref)
  60 {
  61         struct i915_drm_client *client =
  62                 container_of(kref, typeof(*client), kref);
  63         struct xarray *xa = &client->clients->xarray;
  64         unsigned long flags;
  65
  66         xa_lock_irqsave(xa, flags);
  67         __xa_erase(xa, client->id);
  68         xa_unlock_irqrestore(xa, flags);
  69         kfree(client);
  70 }
  71
  72 void i915_drm_clients_fini(struct i915_drm_clients *clients)
  73 {
  74         GEM_BUG_ON(!xa_empty(&clients->xarray));
  75         xa_destroy(&clients->xarray);
  76 }
  77
  78 #ifdef CONFIG_PROC_FS
  79 static const char * const uabi_class_names[] = {
  80         [I915_ENGINE_CLASS_RENDER] = "render",
  81         [I915_ENGINE_CLASS_COPY] = "copy",
  82         [I915_ENGINE_CLASS_VIDEO] = "video",
  83         [I915_ENGINE_CLASS_VIDEO_ENHANCE] = "video-enhance",
  84         [I915_ENGINE_CLASS_COMPUTE] = "compute",
  85 };
  86
  87 static u64 busy_add(struct i915_gem_context *ctx, unsigned int class)
  88 {
  89         struct i915_gem_engines_iter it;
  90         struct intel_context *ce;
  91         u64 total = 0;
  92
  93         for_each_gem_engine(ce, rcu_dereference(ctx->engines), it) {
  94                 if (ce->engine->uabi_class != class)
  95                         continue;
  96
  97                 total += intel_context_get_total_runtime_ns(ce);
  98         }
  99
 100         return total;
 101 }
 102
 103 static void
 104 show_client_class(struct seq_file *m,
 105                   struct i915_drm_client *client,
 106                   unsigned int class)
 107 {
 108         const struct list_head *list = &client->ctx_list;
 109         u64 total = atomic64_read(&client->past_runtime[class]);
 110         const unsigned int capacity =
 111                 client->clients->i915->engine_uabi_class_count[class];
 112         struct i915_gem_context *ctx;
 113
 114         rcu_read_lock();
 115         list_for_each_entry_rcu(ctx, list, client_link)
 116                 total += busy_add(ctx, class);
 117         rcu_read_unlock();
 118
 119         if (capacity)
 120                 seq_printf(m, "drm-engine-%s:\t%llu ns\n",
 121                            uabi_class_names[class], total);
 122
 123         if (capacity > 1)
 124                 seq_printf(m, "drm-engine-capacity-%s:\t%u\n",
 125                            uabi_class_names[class],
 126                            capacity);
 127 }
 128
 129 void i915_drm_client_fdinfo(struct seq_file *m, struct file *f)
 130 {
 131         struct drm_file *file = f->private_data;
 132         struct drm_i915_file_private *file_priv = file->driver_priv;
 133         struct drm_i915_private *i915 = file_priv->dev_priv;
 134         struct i915_drm_client *client = file_priv->client;
 135         struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 136         unsigned int i;
 137
 138         /*
 139          * ******************************************************************
 140          * For text output format description please see drm-usage-stats.rst!
 141          * ******************************************************************
 142          */
 143
 144         seq_printf(m, "drm-driver:\t%s\n", i915->drm.driver->name);
 145         seq_printf(m, "drm-pdev:\t%04x:%02x:%02x.%d\n",
 146                    pci_domain_nr(pdev->bus), pdev->bus->number,
 147                    PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
 148         seq_printf(m, "drm-client-id:\t%u\n", client->id);
 149
 150         /*
 151          * Temporarily skip showing client engine information with GuC submission till
 152          * fetching engine busyness is implemented in the GuC submission backend
 153          */
 154         if (GRAPHICS_VER(i915) < 8 || intel_uc_uses_guc_submission(&i915->gt0.uc))
 155                 return;
 156
 157         for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++)
 158                 show_client_class(m, client, i);
 159 }
 160 #endif