cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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i915_drm_client.c (4118B)

      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
     20void 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
     29struct 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
     53err:
     54	kfree(client);
     55
     56	return ERR_PTR(ret);
     57}
     58
     59void __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
     72void 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
     79static 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
     87static 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
    103static void
    104show_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
    129void 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