drm/i915/i915_drm_client.c

0001 // SPDX-License-Identifier: MIT
0002 /*
0003  * Copyright © 2020 Intel Corporation
0004  */
0005
0006 #include <linux/kernel.h>
0007 #include <linux/slab.h>
0008 #include <linux/types.h>
0009
0010 #include <uapi/drm/i915_drm.h>
0011
0012 #include <drm/drm_print.h>
0013
0014 #include "gem/i915_gem_context.h"
0015 #include "i915_drm_client.h"
0016 #include "i915_file_private.h"
0017 #include "i915_gem.h"
0018 #include "i915_utils.h"
0019
0020 void i915_drm_clients_init(struct i915_drm_clients *clients,
0021                struct drm_i915_private *i915)
0022 {
0023     clients->i915 = i915;
0024     clients->next_id = 0;
0025
0026     xa_init_flags(&clients->xarray, XA_FLAGS_ALLOC | XA_FLAGS_LOCK_IRQ);
0027 }
0028
0029 struct i915_drm_client *i915_drm_client_add(struct i915_drm_clients *clients)
0030 {
0031     struct i915_drm_client *client;
0032     struct xarray *xa = &clients->xarray;
0033     int ret;
0034
0035     client = kzalloc(sizeof(*client), GFP_KERNEL);
0036     if (!client)
0037         return ERR_PTR(-ENOMEM);
0038
0039     xa_lock_irq(xa);
0040     ret = __xa_alloc_cyclic(xa, &client->id, client, xa_limit_32b,
0041                 &clients->next_id, GFP_KERNEL);
0042     xa_unlock_irq(xa);
0043     if (ret < 0)
0044         goto err;
0045
0046     kref_init(&client->kref);
0047     spin_lock_init(&client->ctx_lock);
0048     INIT_LIST_HEAD(&client->ctx_list);
0049     client->clients = clients;
0050
0051     return client;
0052
0053 err:
0054     kfree(client);
0055
0056     return ERR_PTR(ret);
0057 }
0058
0059 void __i915_drm_client_free(struct kref *kref)
0060 {
0061     struct i915_drm_client *client =
0062         container_of(kref, typeof(*client), kref);
0063     struct xarray *xa = &client->clients->xarray;
0064     unsigned long flags;
0065
0066     xa_lock_irqsave(xa, flags);
0067     __xa_erase(xa, client->id);
0068     xa_unlock_irqrestore(xa, flags);
0069     kfree(client);
0070 }
0071
0072 void i915_drm_clients_fini(struct i915_drm_clients *clients)
0073 {
0074     GEM_BUG_ON(!xa_empty(&clients->xarray));
0075     xa_destroy(&clients->xarray);
0076 }
0077
0078 #ifdef CONFIG_PROC_FS
0079 static const char * const uabi_class_names[] = {
0080     [I915_ENGINE_CLASS_RENDER] = "render",
0081     [I915_ENGINE_CLASS_COPY] = "copy",
0082     [I915_ENGINE_CLASS_VIDEO] = "video",
0083     [I915_ENGINE_CLASS_VIDEO_ENHANCE] = "video-enhance",
0084     [I915_ENGINE_CLASS_COMPUTE] = "compute",
0085 };
0086
0087 static u64 busy_add(struct i915_gem_context *ctx, unsigned int class)
0088 {
0089     struct i915_gem_engines_iter it;
0090     struct intel_context *ce;
0091     u64 total = 0;
0092
0093     for_each_gem_engine(ce, rcu_dereference(ctx->engines), it) {
0094         if (ce->engine->uabi_class != class)
0095             continue;
0096
0097         total += intel_context_get_total_runtime_ns(ce);
0098     }
0099
0100     return total;
0101 }
0102
0103 static void
0104 show_client_class(struct seq_file *m,
0105           struct i915_drm_client *client,
0106           unsigned int class)
0107 {
0108     const struct list_head *list = &client->ctx_list;
0109     u64 total = atomic64_read(&client->past_runtime[class]);
0110     const unsigned int capacity =
0111         client->clients->i915->engine_uabi_class_count[class];
0112     struct i915_gem_context *ctx;
0113
0114     rcu_read_lock();
0115     list_for_each_entry_rcu(ctx, list, client_link)
0116         total += busy_add(ctx, class);
0117     rcu_read_unlock();
0118
0119     if (capacity)
0120         seq_printf(m, "drm-engine-%s:\t%llu ns\n",
0121                uabi_class_names[class], total);
0122
0123     if (capacity > 1)
0124         seq_printf(m, "drm-engine-capacity-%s:\t%u\n",
0125                uabi_class_names[class],
0126                capacity);
0127 }
0128
0129 void i915_drm_client_fdinfo(struct seq_file *m, struct file *f)
0130 {
0131     struct drm_file *file = f->private_data;
0132     struct drm_i915_file_private *file_priv = file->driver_priv;
0133     struct drm_i915_private *i915 = file_priv->dev_priv;
0134     struct i915_drm_client *client = file_priv->client;
0135     struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
0136     unsigned int i;
0137
0138     /*
0139      * ******************************************************************
0140      * For text output format description please see drm-usage-stats.rst!
0141      * ******************************************************************
0142      */
0143
0144     seq_printf(m, "drm-driver:\t%s\n", i915->drm.driver->name);
0145     seq_printf(m, "drm-pdev:\t%04x:%02x:%02x.%d\n",
0146            pci_domain_nr(pdev->bus), pdev->bus->number,
0147            PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
0148     seq_printf(m, "drm-client-id:\t%u\n", client->id);
0149
0150     /*
0151      * Temporarily skip showing client engine information with GuC submission till
0152      * fetching engine busyness is implemented in the GuC submission backend
0153      */
0154     if (GRAPHICS_VER(i915) < 8 || intel_uc_uses_guc_submission(&i915->gt0.uc))
0155         return;
0156
0157     for (i = 0; i < ARRAY_SIZE(uabi_class_names); i++)
0158         show_client_class(m, client, i);
0159 }
0160 #endif