kfd_smi_events.c

  1// SPDX-License-Identifier: GPL-2.0 OR MIT
  2/*
  3 * Copyright 2020-2022 Advanced Micro Devices, Inc.
  4 *
  5 * Permission is hereby granted, free of charge, to any person obtaining a
  6 * copy of this software and associated documentation files (the "Software"),
  7 * to deal in the Software without restriction, including without limitation
  8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  9 * and/or sell copies of the Software, and to permit persons to whom the
 10 * Software is furnished to do so, subject to the following conditions:
 11 *
 12 * The above copyright notice and this permission notice shall be included in
 13 * all copies or substantial portions of the Software.
 14 *
 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 18 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 19 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 20 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 21 * OTHER DEALINGS IN THE SOFTWARE.
 22 */
 23
 24#include <linux/poll.h>
 25#include <linux/wait.h>
 26#include <linux/anon_inodes.h>
 27#include <uapi/linux/kfd_ioctl.h>
 28#include "amdgpu.h"
 29#include "amdgpu_vm.h"
 30#include "kfd_priv.h"
 31#include "kfd_smi_events.h"
 32#include "amdgpu_reset.h"
 33
 34struct kfd_smi_client {
 35	struct list_head list;
 36	struct kfifo fifo;
 37	wait_queue_head_t wait_queue;
 38	/* events enabled */
 39	uint64_t events;
 40	struct kfd_node *dev;
 41	spinlock_t lock;
 42	struct rcu_head rcu;
 43	pid_t pid;
 44	bool suser;
 45};
 46
 47#define KFD_MAX_KFIFO_SIZE	8192
 48
 49static __poll_t kfd_smi_ev_poll(struct file *, struct poll_table_struct *);
 50static ssize_t kfd_smi_ev_read(struct file *, char __user *, size_t, loff_t *);
 51static ssize_t kfd_smi_ev_write(struct file *, const char __user *, size_t,
 52				loff_t *);
 53static int kfd_smi_ev_release(struct inode *, struct file *);
 54
 55static const char kfd_smi_name[] = "kfd_smi_ev";
 56
 57static const struct file_operations kfd_smi_ev_fops = {
 58	.owner = THIS_MODULE,
 59	.poll = kfd_smi_ev_poll,
 60	.read = kfd_smi_ev_read,
 61	.write = kfd_smi_ev_write,
 62	.release = kfd_smi_ev_release
 63};
 64
 65static __poll_t kfd_smi_ev_poll(struct file *filep,
 66				struct poll_table_struct *wait)
 67{
 68	struct kfd_smi_client *client = filep->private_data;
 69	__poll_t mask = 0;
 70
 71	poll_wait(filep, &client->wait_queue, wait);
 72
 73	spin_lock(&client->lock);
 74	if (!kfifo_is_empty(&client->fifo))
 75		mask = EPOLLIN | EPOLLRDNORM;
 76	spin_unlock(&client->lock);
 77
 78	return mask;
 79}
 80
 81static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
 82			       size_t size, loff_t *offset)
 83{
 84	int ret;
 85	size_t to_copy;
 86	struct kfd_smi_client *client = filep->private_data;
 87	unsigned char *buf;
 88
 89	size = min_t(size_t, size, KFD_MAX_KFIFO_SIZE);
 90	buf = kmalloc(size, GFP_KERNEL);
 91	if (!buf)
 92		return -ENOMEM;
 93
 94	/* kfifo_to_user can sleep so we can't use spinlock protection around
 95	 * it. Instead, we kfifo out as spinlocked then copy them to the user.
 96	 */
 97	spin_lock(&client->lock);
 98	to_copy = kfifo_len(&client->fifo);
 99	if (!to_copy) {
100		spin_unlock(&client->lock);
101		ret = -EAGAIN;
102		goto ret_err;
103	}
104	to_copy = min(size, to_copy);
105	ret = kfifo_out(&client->fifo, buf, to_copy);
106	spin_unlock(&client->lock);
107	if (ret <= 0) {
108		ret = -EAGAIN;
109		goto ret_err;
110	}
111
112	ret = copy_to_user(user, buf, to_copy);
113	if (ret) {
114		ret = -EFAULT;
115		goto ret_err;
116	}
117
118	kfree(buf);
119	return to_copy;
120
121ret_err:
122	kfree(buf);
123	return ret;
124}
125
126static ssize_t kfd_smi_ev_write(struct file *filep, const char __user *user,
127				size_t size, loff_t *offset)
128{
129	struct kfd_smi_client *client = filep->private_data;
130	uint64_t events;
131
132	if (!access_ok(user, size) || size < sizeof(events))
133		return -EFAULT;
134	if (copy_from_user(&events, user, sizeof(events)))
135		return -EFAULT;
136
137	WRITE_ONCE(client->events, events);
138
139	return sizeof(events);
140}
141
142static void kfd_smi_ev_client_free(struct rcu_head *p)
143{
144	struct kfd_smi_client *ev = container_of(p, struct kfd_smi_client, rcu);
145
146	kfifo_free(&ev->fifo);
147	kfree(ev);
148}
149
150static int kfd_smi_ev_release(struct inode *inode, struct file *filep)
151{
152	struct kfd_smi_client *client = filep->private_data;
153	struct kfd_node *dev = client->dev;
154
155	spin_lock(&dev->smi_lock);
156	list_del_rcu(&client->list);
157	spin_unlock(&dev->smi_lock);
158
159	call_rcu(&client->rcu, kfd_smi_ev_client_free);
160	return 0;
161}
162
163static bool kfd_smi_ev_enabled(pid_t pid, struct kfd_smi_client *client,
164			       unsigned int event)
165{
166	uint64_t events = READ_ONCE(client->events);
167
168	if (pid && client->pid != pid && !client->suser)
169		return false;
170
171	return events & KFD_SMI_EVENT_MASK_FROM_INDEX(event);
172}
173
174static void add_event_to_kfifo(pid_t pid, struct kfd_node *dev,
175			       unsigned int smi_event, char *event_msg, int len)
176{
177	struct kfd_smi_client *client;
178
179	rcu_read_lock();
180
181	list_for_each_entry_rcu(client, &dev->smi_clients, list) {
182		if (!kfd_smi_ev_enabled(pid, client, smi_event))
183			continue;
184		spin_lock(&client->lock);
185		if (kfifo_avail(&client->fifo) >= len) {
186			kfifo_in(&client->fifo, event_msg, len);
187			wake_up_all(&client->wait_queue);
188		} else {
189			pr_debug("smi_event(EventID: %u): no space left\n",
190					smi_event);
191		}
192		spin_unlock(&client->lock);
193	}
194
195	rcu_read_unlock();
196}
197
198__printf(4, 5)
199static void kfd_smi_event_add(pid_t pid, struct kfd_node *dev,
200			      unsigned int event, char *fmt, ...)
201{
202	char fifo_in[KFD_SMI_EVENT_MSG_SIZE];
203	int len;
204	va_list args;
205
206	if (list_empty(&dev->smi_clients))
207		return;
208
209	len = snprintf(fifo_in, sizeof(fifo_in), "%x ", event);
210
211	va_start(args, fmt);
212	len += vsnprintf(fifo_in + len, sizeof(fifo_in) - len, fmt, args);
213	va_end(args);
214
215	add_event_to_kfifo(pid, dev, event, fifo_in, len);
216}
217
218void kfd_smi_event_update_gpu_reset(struct kfd_node *dev, bool post_reset,
219				    struct amdgpu_reset_context *reset_context)
220{
221	unsigned int event;
222	char reset_cause[64];
223
224	if (post_reset) {
225		event = KFD_SMI_EVENT_GPU_POST_RESET;
226	} else {
227		event = KFD_SMI_EVENT_GPU_PRE_RESET;
228		++(dev->reset_seq_num);
229	}
230
231	memset(reset_cause, 0, sizeof(reset_cause));
232
233	if (reset_context)
234		amdgpu_reset_get_desc(reset_context, reset_cause,
235				      sizeof(reset_cause));
236
237	kfd_smi_event_add(0, dev, event, KFD_EVENT_FMT_UPDATE_GPU_RESET(
238			  dev->reset_seq_num, reset_cause));
239}
240
241void kfd_smi_event_update_thermal_throttling(struct kfd_node *dev,
242					     uint64_t throttle_bitmask)
243{
244	kfd_smi_event_add(0, dev, KFD_SMI_EVENT_THERMAL_THROTTLE, KFD_EVENT_FMT_THERMAL_THROTTLING(
245			  throttle_bitmask,
246			  amdgpu_dpm_get_thermal_throttling_counter(dev->adev)));
247}
248
249void kfd_smi_event_update_vmfault(struct kfd_node *dev, uint16_t pasid)
250{
251	struct amdgpu_task_info *task_info;
252
253	task_info = amdgpu_vm_get_task_info_pasid(dev->adev, pasid);
254	if (task_info) {
255		/* Report VM faults from user applications, not retry from kernel */
256		if (task_info->task.pid)
257			kfd_smi_event_add(0, dev, KFD_SMI_EVENT_VMFAULT, KFD_EVENT_FMT_VMFAULT(
258					  task_info->task.pid, task_info->task.comm));
259		amdgpu_vm_put_task_info(task_info);
260	}
261}
262
263void kfd_smi_event_page_fault_start(struct kfd_node *node, pid_t pid,
264				    unsigned long address, bool write_fault,
265				    ktime_t ts)
266{
267	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_PAGE_FAULT_START,
268			  KFD_EVENT_FMT_PAGEFAULT_START(ktime_to_ns(ts), pid,
269			  address, node->id, write_fault ? 'W' : 'R'));
270}
271
272void kfd_smi_event_page_fault_end(struct kfd_node *node, pid_t pid,
273				  unsigned long address, bool migration)
274{
275	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_PAGE_FAULT_END,
276			  KFD_EVENT_FMT_PAGEFAULT_END(ktime_get_boottime_ns(),
277			  pid, address, node->id, migration ? 'M' : 'U'));
278}
279
280void kfd_smi_event_migration_start(struct kfd_node *node, pid_t pid,
281				   unsigned long start, unsigned long end,
282				   uint32_t from, uint32_t to,
283				   uint32_t prefetch_loc, uint32_t preferred_loc,
284				   uint32_t trigger)
285{
286	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_MIGRATE_START,
287			  KFD_EVENT_FMT_MIGRATE_START(
288			  ktime_get_boottime_ns(), pid, start, end - start,
289			  from, to, prefetch_loc, preferred_loc, trigger));
290}
291
292void kfd_smi_event_migration_end(struct kfd_node *node, pid_t pid,
293				 unsigned long start, unsigned long end,
294				 uint32_t from, uint32_t to, uint32_t trigger,
295				 int error_code)
296{
297	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_MIGRATE_END,
298			  KFD_EVENT_FMT_MIGRATE_END(
299			  ktime_get_boottime_ns(), pid, start, end - start,
300			  from, to, trigger, error_code));
301}
302
303void kfd_smi_event_queue_eviction(struct kfd_node *node, pid_t pid,
304				  uint32_t trigger)
305{
306	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_QUEUE_EVICTION,
307			  KFD_EVENT_FMT_QUEUE_EVICTION(ktime_get_boottime_ns(), pid,
308			  node->id, trigger));
309}
310
311void kfd_smi_event_queue_restore(struct kfd_node *node, pid_t pid)
312{
313	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_QUEUE_RESTORE,
314			  KFD_EVENT_FMT_QUEUE_RESTORE(ktime_get_boottime_ns(), pid,
315			  node->id, '0'));
316}
317
318void kfd_smi_event_queue_restore_rescheduled(struct mm_struct *mm)
319{
320	struct kfd_process *p;
321	int i;
322
323	p = kfd_lookup_process_by_mm(mm);
324	if (!p)
325		return;
326
327	for (i = 0; i < p->n_pdds; i++) {
328		struct kfd_process_device *pdd = p->pdds[i];
329
330		kfd_smi_event_add(p->lead_thread->pid, pdd->dev,
331				  KFD_SMI_EVENT_QUEUE_RESTORE,
332				  KFD_EVENT_FMT_QUEUE_RESTORE(ktime_get_boottime_ns(),
333				  p->lead_thread->pid, pdd->dev->id, 'R'));
334	}
335	kfd_unref_process(p);
336}
337
338void kfd_smi_event_unmap_from_gpu(struct kfd_node *node, pid_t pid,
339				  unsigned long address, unsigned long last,
340				  uint32_t trigger)
341{
342	kfd_smi_event_add(pid, node, KFD_SMI_EVENT_UNMAP_FROM_GPU,
343			  KFD_EVENT_FMT_UNMAP_FROM_GPU(ktime_get_boottime_ns(),
344			  pid, address, last - address + 1, node->id, trigger));
345}
346
347void kfd_smi_event_process(struct kfd_process_device *pdd, bool start)
348{
349	struct amdgpu_task_info *task_info;
350	struct amdgpu_vm *avm;
351
352	if (!pdd->drm_priv)
353		return;
354
355	avm = drm_priv_to_vm(pdd->drm_priv);
356	task_info = amdgpu_vm_get_task_info_vm(avm);
357
358	if (task_info) {
359		kfd_smi_event_add(0, pdd->dev,
360				  start ? KFD_SMI_EVENT_PROCESS_START :
361				  KFD_SMI_EVENT_PROCESS_END,
362				  KFD_EVENT_FMT_PROCESS(task_info->task.pid,
363				  task_info->task.comm));
364		amdgpu_vm_put_task_info(task_info);
365	}
366}
367
368int kfd_smi_event_open(struct kfd_node *dev, uint32_t *fd)
369{
370	struct kfd_smi_client *client;
371	int ret;
372
373	client = kzalloc(sizeof(struct kfd_smi_client), GFP_KERNEL);
374	if (!client)
375		return -ENOMEM;
376	INIT_LIST_HEAD(&client->list);
377
378	ret = kfifo_alloc(&client->fifo, KFD_MAX_KFIFO_SIZE, GFP_KERNEL);
379	if (ret) {
380		kfree(client);
381		return ret;
382	}
383
384	init_waitqueue_head(&client->wait_queue);
385	spin_lock_init(&client->lock);
386	client->events = 0;
387	client->dev = dev;
388	client->pid = current->tgid;
389	client->suser = capable(CAP_SYS_ADMIN);
390
391	spin_lock(&dev->smi_lock);
392	list_add_rcu(&client->list, &dev->smi_clients);
393	spin_unlock(&dev->smi_lock);
394
395	ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
396			       O_RDWR);
397	if (ret < 0) {
398		spin_lock(&dev->smi_lock);
399		list_del_rcu(&client->list);
400		spin_unlock(&dev->smi_lock);
401
402		synchronize_rcu();
403
404		kfifo_free(&client->fifo);
405		kfree(client);
406		return ret;
407	}
408	*fd = ret;
409
410	return 0;
411}