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1/*
2 * Copyright 2020 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 */
22
23#include <linux/poll.h>
24#include <linux/wait.h>
25#include <linux/anon_inodes.h>
26#include <uapi/linux/kfd_ioctl.h>
27#include "amdgpu_vm.h"
28#include "kfd_priv.h"
29#include "kfd_smi_events.h"
30
31struct kfd_smi_client {
32 struct list_head list;
33 struct kfifo fifo;
34 wait_queue_head_t wait_queue;
35 /* events enabled */
36 uint64_t events;
37 struct kfd_dev *dev;
38 spinlock_t lock;
39};
40
41#define MAX_KFIFO_SIZE 1024
42
43static __poll_t kfd_smi_ev_poll(struct file *, struct poll_table_struct *);
44static ssize_t kfd_smi_ev_read(struct file *, char __user *, size_t, loff_t *);
45static ssize_t kfd_smi_ev_write(struct file *, const char __user *, size_t,
46 loff_t *);
47static int kfd_smi_ev_release(struct inode *, struct file *);
48
49static const char kfd_smi_name[] = "kfd_smi_ev";
50
51static const struct file_operations kfd_smi_ev_fops = {
52 .owner = THIS_MODULE,
53 .poll = kfd_smi_ev_poll,
54 .read = kfd_smi_ev_read,
55 .write = kfd_smi_ev_write,
56 .release = kfd_smi_ev_release
57};
58
59static __poll_t kfd_smi_ev_poll(struct file *filep,
60 struct poll_table_struct *wait)
61{
62 struct kfd_smi_client *client = filep->private_data;
63 __poll_t mask = 0;
64
65 poll_wait(filep, &client->wait_queue, wait);
66
67 spin_lock(&client->lock);
68 if (!kfifo_is_empty(&client->fifo))
69 mask = EPOLLIN | EPOLLRDNORM;
70 spin_unlock(&client->lock);
71
72 return mask;
73}
74
75static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
76 size_t size, loff_t *offset)
77{
78 int ret;
79 size_t to_copy;
80 struct kfd_smi_client *client = filep->private_data;
81 unsigned char *buf;
82
83 buf = kmalloc(MAX_KFIFO_SIZE * sizeof(*buf), GFP_KERNEL);
84 if (!buf)
85 return -ENOMEM;
86
87 /* kfifo_to_user can sleep so we can't use spinlock protection around
88 * it. Instead, we kfifo out as spinlocked then copy them to the user.
89 */
90 spin_lock(&client->lock);
91 to_copy = kfifo_len(&client->fifo);
92 if (!to_copy) {
93 spin_unlock(&client->lock);
94 ret = -EAGAIN;
95 goto ret_err;
96 }
97 to_copy = min3(size, sizeof(buf), to_copy);
98 ret = kfifo_out(&client->fifo, buf, to_copy);
99 spin_unlock(&client->lock);
100 if (ret <= 0) {
101 ret = -EAGAIN;
102 goto ret_err;
103 }
104
105 ret = copy_to_user(user, buf, to_copy);
106 if (ret) {
107 ret = -EFAULT;
108 goto ret_err;
109 }
110
111 kfree(buf);
112 return to_copy;
113
114ret_err:
115 kfree(buf);
116 return ret;
117}
118
119static ssize_t kfd_smi_ev_write(struct file *filep, const char __user *user,
120 size_t size, loff_t *offset)
121{
122 struct kfd_smi_client *client = filep->private_data;
123 uint64_t events;
124
125 if (!access_ok(user, size) || size < sizeof(events))
126 return -EFAULT;
127 if (copy_from_user(&events, user, sizeof(events)))
128 return -EFAULT;
129
130 WRITE_ONCE(client->events, events);
131
132 return sizeof(events);
133}
134
135static int kfd_smi_ev_release(struct inode *inode, struct file *filep)
136{
137 struct kfd_smi_client *client = filep->private_data;
138 struct kfd_dev *dev = client->dev;
139
140 spin_lock(&dev->smi_lock);
141 list_del_rcu(&client->list);
142 spin_unlock(&dev->smi_lock);
143
144 synchronize_rcu();
145 kfifo_free(&client->fifo);
146 kfree(client);
147
148 return 0;
149}
150
151void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
152{
153 struct amdgpu_device *adev = (struct amdgpu_device *)dev->kgd;
154 struct amdgpu_task_info task_info;
155 /* VmFault msg = (hex)uint32_pid(8) + :(1) + task name(16) = 25 */
156 /* 16 bytes event + 1 byte space + 25 bytes msg + 1 byte \n = 43
157 */
158 char fifo_in[43];
159 struct kfd_smi_client *client;
160 int len;
161
162 if (list_empty(&dev->smi_clients))
163 return;
164
165 memset(&task_info, 0, sizeof(struct amdgpu_task_info));
166 amdgpu_vm_get_task_info(adev, pasid, &task_info);
167 /* Report VM faults from user applications, not retry from kernel */
168 if (!task_info.pid)
169 return;
170
171 len = snprintf(fifo_in, 43, "%x %x:%s\n", KFD_SMI_EVENT_VMFAULT,
172 task_info.pid, task_info.task_name);
173
174 rcu_read_lock();
175
176 list_for_each_entry_rcu(client, &dev->smi_clients, list) {
177 if (!(READ_ONCE(client->events) & KFD_SMI_EVENT_VMFAULT))
178 continue;
179 spin_lock(&client->lock);
180 if (kfifo_avail(&client->fifo) >= len) {
181 kfifo_in(&client->fifo, fifo_in, len);
182 wake_up_all(&client->wait_queue);
183 }
184 else
185 pr_debug("smi_event(vmfault): no space left\n");
186 spin_unlock(&client->lock);
187 }
188
189 rcu_read_unlock();
190}
191
192int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
193{
194 struct kfd_smi_client *client;
195 int ret;
196
197 client = kzalloc(sizeof(struct kfd_smi_client), GFP_KERNEL);
198 if (!client)
199 return -ENOMEM;
200 INIT_LIST_HEAD(&client->list);
201
202 ret = kfifo_alloc(&client->fifo, MAX_KFIFO_SIZE, GFP_KERNEL);
203 if (ret) {
204 kfree(client);
205 return ret;
206 }
207
208 ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
209 O_RDWR);
210 if (ret < 0) {
211 kfifo_free(&client->fifo);
212 kfree(client);
213 return ret;
214 }
215 *fd = ret;
216
217 init_waitqueue_head(&client->wait_queue);
218 spin_lock_init(&client->lock);
219 client->events = 0;
220 client->dev = dev;
221
222 spin_lock(&dev->smi_lock);
223 list_add_rcu(&client->list, &dev->smi_clients);
224 spin_unlock(&dev->smi_lock);
225
226 return 0;
227}
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
33struct kfd_smi_client {
34 struct list_head list;
35 struct kfifo fifo;
36 wait_queue_head_t wait_queue;
37 /* events enabled */
38 uint64_t events;
39 struct kfd_node *dev;
40 spinlock_t lock;
41 struct rcu_head rcu;
42 pid_t pid;
43 bool suser;
44};
45
46#define MAX_KFIFO_SIZE 1024
47
48static __poll_t kfd_smi_ev_poll(struct file *, struct poll_table_struct *);
49static ssize_t kfd_smi_ev_read(struct file *, char __user *, size_t, loff_t *);
50static ssize_t kfd_smi_ev_write(struct file *, const char __user *, size_t,
51 loff_t *);
52static int kfd_smi_ev_release(struct inode *, struct file *);
53
54static const char kfd_smi_name[] = "kfd_smi_ev";
55
56static const struct file_operations kfd_smi_ev_fops = {
57 .owner = THIS_MODULE,
58 .poll = kfd_smi_ev_poll,
59 .read = kfd_smi_ev_read,
60 .write = kfd_smi_ev_write,
61 .release = kfd_smi_ev_release
62};
63
64static __poll_t kfd_smi_ev_poll(struct file *filep,
65 struct poll_table_struct *wait)
66{
67 struct kfd_smi_client *client = filep->private_data;
68 __poll_t mask = 0;
69
70 poll_wait(filep, &client->wait_queue, wait);
71
72 spin_lock(&client->lock);
73 if (!kfifo_is_empty(&client->fifo))
74 mask = EPOLLIN | EPOLLRDNORM;
75 spin_unlock(&client->lock);
76
77 return mask;
78}
79
80static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
81 size_t size, loff_t *offset)
82{
83 int ret;
84 size_t to_copy;
85 struct kfd_smi_client *client = filep->private_data;
86 unsigned char *buf;
87
88 size = min_t(size_t, size, MAX_KFIFO_SIZE);
89 buf = kmalloc(size, GFP_KERNEL);
90 if (!buf)
91 return -ENOMEM;
92
93 /* kfifo_to_user can sleep so we can't use spinlock protection around
94 * it. Instead, we kfifo out as spinlocked then copy them to the user.
95 */
96 spin_lock(&client->lock);
97 to_copy = kfifo_len(&client->fifo);
98 if (!to_copy) {
99 spin_unlock(&client->lock);
100 ret = -EAGAIN;
101 goto ret_err;
102 }
103 to_copy = min(size, to_copy);
104 ret = kfifo_out(&client->fifo, buf, to_copy);
105 spin_unlock(&client->lock);
106 if (ret <= 0) {
107 ret = -EAGAIN;
108 goto ret_err;
109 }
110
111 ret = copy_to_user(user, buf, to_copy);
112 if (ret) {
113 ret = -EFAULT;
114 goto ret_err;
115 }
116
117 kfree(buf);
118 return to_copy;
119
120ret_err:
121 kfree(buf);
122 return ret;
123}
124
125static ssize_t kfd_smi_ev_write(struct file *filep, const char __user *user,
126 size_t size, loff_t *offset)
127{
128 struct kfd_smi_client *client = filep->private_data;
129 uint64_t events;
130
131 if (!access_ok(user, size) || size < sizeof(events))
132 return -EFAULT;
133 if (copy_from_user(&events, user, sizeof(events)))
134 return -EFAULT;
135
136 WRITE_ONCE(client->events, events);
137
138 return sizeof(events);
139}
140
141static void kfd_smi_ev_client_free(struct rcu_head *p)
142{
143 struct kfd_smi_client *ev = container_of(p, struct kfd_smi_client, rcu);
144
145 kfifo_free(&ev->fifo);
146 kfree(ev);
147}
148
149static int kfd_smi_ev_release(struct inode *inode, struct file *filep)
150{
151 struct kfd_smi_client *client = filep->private_data;
152 struct kfd_node *dev = client->dev;
153
154 spin_lock(&dev->smi_lock);
155 list_del_rcu(&client->list);
156 spin_unlock(&dev->smi_lock);
157
158 call_rcu(&client->rcu, kfd_smi_ev_client_free);
159 return 0;
160}
161
162static bool kfd_smi_ev_enabled(pid_t pid, struct kfd_smi_client *client,
163 unsigned int event)
164{
165 uint64_t all = KFD_SMI_EVENT_MASK_FROM_INDEX(KFD_SMI_EVENT_ALL_PROCESS);
166 uint64_t events = READ_ONCE(client->events);
167
168 if (pid && client->pid != pid && !(client->suser && (events & all)))
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{
220 unsigned int event;
221
222 if (post_reset) {
223 event = KFD_SMI_EVENT_GPU_POST_RESET;
224 } else {
225 event = KFD_SMI_EVENT_GPU_PRE_RESET;
226 ++(dev->reset_seq_num);
227 }
228 kfd_smi_event_add(0, dev, event, "%x\n", dev->reset_seq_num);
229}
230
231void kfd_smi_event_update_thermal_throttling(struct kfd_node *dev,
232 uint64_t throttle_bitmask)
233{
234 kfd_smi_event_add(0, dev, KFD_SMI_EVENT_THERMAL_THROTTLE, "%llx:%llx\n",
235 throttle_bitmask,
236 amdgpu_dpm_get_thermal_throttling_counter(dev->adev));
237}
238
239void kfd_smi_event_update_vmfault(struct kfd_node *dev, uint16_t pasid)
240{
241 struct amdgpu_task_info task_info;
242
243 memset(&task_info, 0, sizeof(struct amdgpu_task_info));
244 amdgpu_vm_get_task_info(dev->adev, pasid, &task_info);
245 /* Report VM faults from user applications, not retry from kernel */
246 if (!task_info.pid)
247 return;
248
249 kfd_smi_event_add(0, dev, KFD_SMI_EVENT_VMFAULT, "%x:%s\n",
250 task_info.pid, task_info.task_name);
251}
252
253void kfd_smi_event_page_fault_start(struct kfd_node *node, pid_t pid,
254 unsigned long address, bool write_fault,
255 ktime_t ts)
256{
257 kfd_smi_event_add(pid, node, KFD_SMI_EVENT_PAGE_FAULT_START,
258 "%lld -%d @%lx(%x) %c\n", ktime_to_ns(ts), pid,
259 address, node->id, write_fault ? 'W' : 'R');
260}
261
262void kfd_smi_event_page_fault_end(struct kfd_node *node, pid_t pid,
263 unsigned long address, bool migration)
264{
265 kfd_smi_event_add(pid, node, KFD_SMI_EVENT_PAGE_FAULT_END,
266 "%lld -%d @%lx(%x) %c\n", ktime_get_boottime_ns(),
267 pid, address, node->id, migration ? 'M' : 'U');
268}
269
270void kfd_smi_event_migration_start(struct kfd_node *node, pid_t pid,
271 unsigned long start, unsigned long end,
272 uint32_t from, uint32_t to,
273 uint32_t prefetch_loc, uint32_t preferred_loc,
274 uint32_t trigger)
275{
276 kfd_smi_event_add(pid, node, KFD_SMI_EVENT_MIGRATE_START,
277 "%lld -%d @%lx(%lx) %x->%x %x:%x %d\n",
278 ktime_get_boottime_ns(), pid, start, end - start,
279 from, to, prefetch_loc, preferred_loc, trigger);
280}
281
282void kfd_smi_event_migration_end(struct kfd_node *node, pid_t pid,
283 unsigned long start, unsigned long end,
284 uint32_t from, uint32_t to, uint32_t trigger)
285{
286 kfd_smi_event_add(pid, node, KFD_SMI_EVENT_MIGRATE_END,
287 "%lld -%d @%lx(%lx) %x->%x %d\n",
288 ktime_get_boottime_ns(), pid, start, end - start,
289 from, to, trigger);
290}
291
292void kfd_smi_event_queue_eviction(struct kfd_node *node, pid_t pid,
293 uint32_t trigger)
294{
295 kfd_smi_event_add(pid, node, KFD_SMI_EVENT_QUEUE_EVICTION,
296 "%lld -%d %x %d\n", ktime_get_boottime_ns(), pid,
297 node->id, trigger);
298}
299
300void kfd_smi_event_queue_restore(struct kfd_node *node, pid_t pid)
301{
302 kfd_smi_event_add(pid, node, KFD_SMI_EVENT_QUEUE_RESTORE,
303 "%lld -%d %x\n", ktime_get_boottime_ns(), pid,
304 node->id);
305}
306
307void kfd_smi_event_queue_restore_rescheduled(struct mm_struct *mm)
308{
309 struct kfd_process *p;
310 int i;
311
312 p = kfd_lookup_process_by_mm(mm);
313 if (!p)
314 return;
315
316 for (i = 0; i < p->n_pdds; i++) {
317 struct kfd_process_device *pdd = p->pdds[i];
318
319 kfd_smi_event_add(p->lead_thread->pid, pdd->dev,
320 KFD_SMI_EVENT_QUEUE_RESTORE,
321 "%lld -%d %x %c\n", ktime_get_boottime_ns(),
322 p->lead_thread->pid, pdd->dev->id, 'R');
323 }
324 kfd_unref_process(p);
325}
326
327void kfd_smi_event_unmap_from_gpu(struct kfd_node *node, pid_t pid,
328 unsigned long address, unsigned long last,
329 uint32_t trigger)
330{
331 kfd_smi_event_add(pid, node, KFD_SMI_EVENT_UNMAP_FROM_GPU,
332 "%lld -%d @%lx(%lx) %x %d\n", ktime_get_boottime_ns(),
333 pid, address, last - address + 1, node->id, trigger);
334}
335
336int kfd_smi_event_open(struct kfd_node *dev, uint32_t *fd)
337{
338 struct kfd_smi_client *client;
339 int ret;
340
341 client = kzalloc(sizeof(struct kfd_smi_client), GFP_KERNEL);
342 if (!client)
343 return -ENOMEM;
344 INIT_LIST_HEAD(&client->list);
345
346 ret = kfifo_alloc(&client->fifo, MAX_KFIFO_SIZE, GFP_KERNEL);
347 if (ret) {
348 kfree(client);
349 return ret;
350 }
351
352 init_waitqueue_head(&client->wait_queue);
353 spin_lock_init(&client->lock);
354 client->events = 0;
355 client->dev = dev;
356 client->pid = current->tgid;
357 client->suser = capable(CAP_SYS_ADMIN);
358
359 spin_lock(&dev->smi_lock);
360 list_add_rcu(&client->list, &dev->smi_clients);
361 spin_unlock(&dev->smi_lock);
362
363 ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
364 O_RDWR);
365 if (ret < 0) {
366 spin_lock(&dev->smi_lock);
367 list_del_rcu(&client->list);
368 spin_unlock(&dev->smi_lock);
369
370 synchronize_rcu();
371
372 kfifo_free(&client->fifo);
373 kfree(client);
374 return ret;
375 }
376 *fd = ret;
377
378 return 0;
379}