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(filp: filep, wait_address: &client->wait_queue, p: wait);
72
73 spin_lock(lock: &client->lock);
74 if (!kfifo_is_empty(&client->fifo))
75 mask = EPOLLIN | EPOLLRDNORM;
76 spin_unlock(lock: &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(lock: &client->lock);
98 to_copy = kfifo_len(&client->fifo);
99 if (!to_copy) {
100 spin_unlock(lock: &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(lock: &client->lock);
107 if (ret <= 0) {
108 ret = -EAGAIN;
109 goto ret_err;
110 }
111
112 ret = copy_to_user(to: user, from: buf, n: to_copy);
113 if (ret) {
114 ret = -EFAULT;
115 goto ret_err;
116 }
117
118 kfree(objp: buf);
119 return to_copy;
120
121ret_err:
122 kfree(objp: 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(to: &events, from: user, n: 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(objp: 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(lock: &dev->smi_lock);
156 list_del_rcu(entry: &client->list);
157 spin_unlock(lock: &dev->smi_lock);
158
159 call_rcu(head: &client->rcu, func: 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, event: smi_event))
183 continue;
184 spin_lock(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(lock: &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(head: &dev->smi_clients))
207 return;
208
209 len = snprintf(buf: fifo_in, size: sizeof(fifo_in), fmt: "%x ", event);
210
211 va_start(args, fmt);
212 len += vsnprintf(buf: fifo_in + len, size: sizeof(fifo_in) - len, fmt, args);
213 va_end(args);
214
215 add_event_to_kfifo(pid, dev, smi_event: event, event_msg: 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(rst_ctxt: reset_context, buf: reset_cause,
235 len: sizeof(reset_cause));
236
237 kfd_smi_event_add(pid: 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(pid: 0, dev, event: 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(adev: 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(pid: 0, dev, event: 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, dev: node, event: 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, dev: node, event: 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, dev: node, event: 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, dev: node, event: 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, dev: node, event: 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, dev: node, event: 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(pid: p->lead_thread->pid, dev: pdd->dev,
331 event: 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, dev: node, event: 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(vm: avm);
357
358 if (task_info) {
359 kfd_smi_event_add(pid: 0, dev: pdd->dev,
360 event: 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(list: &client->list);
377
378 ret = kfifo_alloc(&client->fifo, KFD_MAX_KFIFO_SIZE, GFP_KERNEL);
379 if (ret) {
380 kfree(objp: 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(lock: &dev->smi_lock);
392 list_add_rcu(new: &client->list, head: &dev->smi_clients);
393 spin_unlock(lock: &dev->smi_lock);
394
395 ret = anon_inode_getfd(name: kfd_smi_name, fops: &kfd_smi_ev_fops, priv: (void *)client,
396 O_RDWR);
397 if (ret < 0) {
398 spin_lock(lock: &dev->smi_lock);
399 list_del_rcu(entry: &client->list);
400 spin_unlock(lock: &dev->smi_lock);
401
402 synchronize_rcu();
403
404 kfifo_free(&client->fifo);
405 kfree(objp: client);
406 return ret;
407 }
408 *fd = ret;
409
410 return 0;
411}
412

source code of linux/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c