2 * Copyright 2020 Advanced Micro Devices, Inc.
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:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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.
23 #include <linux/poll.h>
24 #include <linux/wait.h>
25 #include <linux/anon_inodes.h>
26 #include <uapi/linux/kfd_ioctl.h>
28 #include "amdgpu_vm.h"
30 #include "kfd_smi_events.h"
32 struct kfd_smi_client {
33 struct list_head list;
35 wait_queue_head_t wait_queue;
42 #define MAX_KFIFO_SIZE 1024
44 static __poll_t kfd_smi_ev_poll(struct file *, struct poll_table_struct *);
45 static ssize_t kfd_smi_ev_read(struct file *, char __user *, size_t, loff_t *);
46 static ssize_t kfd_smi_ev_write(struct file *, const char __user *, size_t,
48 static int kfd_smi_ev_release(struct inode *, struct file *);
50 static const char kfd_smi_name[] = "kfd_smi_ev";
52 static const struct file_operations kfd_smi_ev_fops = {
54 .poll = kfd_smi_ev_poll,
55 .read = kfd_smi_ev_read,
56 .write = kfd_smi_ev_write,
57 .release = kfd_smi_ev_release
60 static __poll_t kfd_smi_ev_poll(struct file *filep,
61 struct poll_table_struct *wait)
63 struct kfd_smi_client *client = filep->private_data;
66 poll_wait(filep, &client->wait_queue, wait);
68 spin_lock(&client->lock);
69 if (!kfifo_is_empty(&client->fifo))
70 mask = EPOLLIN | EPOLLRDNORM;
71 spin_unlock(&client->lock);
76 static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
77 size_t size, loff_t *offset)
81 struct kfd_smi_client *client = filep->private_data;
84 buf = kmalloc(MAX_KFIFO_SIZE * sizeof(*buf), GFP_KERNEL);
88 /* kfifo_to_user can sleep so we can't use spinlock protection around
89 * it. Instead, we kfifo out as spinlocked then copy them to the user.
91 spin_lock(&client->lock);
92 to_copy = kfifo_len(&client->fifo);
94 spin_unlock(&client->lock);
98 to_copy = min3(size, sizeof(buf), to_copy);
99 ret = kfifo_out(&client->fifo, buf, to_copy);
100 spin_unlock(&client->lock);
106 ret = copy_to_user(user, buf, to_copy);
120 static ssize_t kfd_smi_ev_write(struct file *filep, const char __user *user,
121 size_t size, loff_t *offset)
123 struct kfd_smi_client *client = filep->private_data;
126 if (!access_ok(user, size) || size < sizeof(events))
128 if (copy_from_user(&events, user, sizeof(events)))
131 WRITE_ONCE(client->events, events);
133 return sizeof(events);
136 static int kfd_smi_ev_release(struct inode *inode, struct file *filep)
138 struct kfd_smi_client *client = filep->private_data;
139 struct kfd_dev *dev = client->dev;
141 spin_lock(&dev->smi_lock);
142 list_del_rcu(&client->list);
143 spin_unlock(&dev->smi_lock);
146 kfifo_free(&client->fifo);
152 static void add_event_to_kfifo(struct kfd_dev *dev, unsigned int smi_event,
153 char *event_msg, int len)
155 struct kfd_smi_client *client;
159 list_for_each_entry_rcu(client, &dev->smi_clients, list) {
160 if (!(READ_ONCE(client->events) &
161 KFD_SMI_EVENT_MASK_FROM_INDEX(smi_event)))
163 spin_lock(&client->lock);
164 if (kfifo_avail(&client->fifo) >= len) {
165 kfifo_in(&client->fifo, event_msg, len);
166 wake_up_all(&client->wait_queue);
168 pr_debug("smi_event(EventID: %u): no space left\n",
171 spin_unlock(&client->lock);
177 void kfd_smi_event_update_thermal_throttling(struct kfd_dev *dev,
178 uint32_t throttle_bitmask)
180 struct amdgpu_device *adev = (struct amdgpu_device *)dev->kgd;
182 * ThermalThrottle msg = throttle_bitmask(8):
183 * thermal_interrupt_count(16):
184 * 1 byte event + 1 byte space + 8 byte throttle_bitmask +
185 * 1 byte : + 16 byte thermal_interupt_counter + 1 byte \n +
191 if (list_empty(&dev->smi_clients))
194 len = snprintf(fifo_in, 29, "%x %x:%llx\n",
195 KFD_SMI_EVENT_THERMAL_THROTTLE, throttle_bitmask,
196 atomic64_read(&adev->smu.throttle_int_counter));
198 add_event_to_kfifo(dev, KFD_SMI_EVENT_THERMAL_THROTTLE, fifo_in, len);
201 void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
203 struct amdgpu_device *adev = (struct amdgpu_device *)dev->kgd;
204 struct amdgpu_task_info task_info;
205 /* VmFault msg = (hex)uint32_pid(8) + :(1) + task name(16) = 25 */
206 /* 1 byte event + 1 byte space + 25 bytes msg + 1 byte \n +
212 if (list_empty(&dev->smi_clients))
215 memset(&task_info, 0, sizeof(struct amdgpu_task_info));
216 amdgpu_vm_get_task_info(adev, pasid, &task_info);
217 /* Report VM faults from user applications, not retry from kernel */
221 len = snprintf(fifo_in, 29, "%x %x:%s\n", KFD_SMI_EVENT_VMFAULT,
222 task_info.pid, task_info.task_name);
224 add_event_to_kfifo(dev, KFD_SMI_EVENT_VMFAULT, fifo_in, len);
227 int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
229 struct kfd_smi_client *client;
232 client = kzalloc(sizeof(struct kfd_smi_client), GFP_KERNEL);
235 INIT_LIST_HEAD(&client->list);
237 ret = kfifo_alloc(&client->fifo, MAX_KFIFO_SIZE, GFP_KERNEL);
243 ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
246 kfifo_free(&client->fifo);
252 init_waitqueue_head(&client->wait_queue);
253 spin_lock_init(&client->lock);
257 spin_lock(&dev->smi_lock);
258 list_add_rcu(&client->list, &dev->smi_clients);
259 spin_unlock(&dev->smi_lock);