drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c

   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.h"
  28 #include "amdgpu_vm.h"
  29 #include "kfd_priv.h"
  30 #include "kfd_smi_events.h"
  31
  32 struct kfd_smi_client {
  33         struct list_head list;
  34         struct kfifo fifo;
  35         wait_queue_head_t wait_queue;
  36         /* events enabled */
  37         uint64_t events;
  38         struct kfd_dev *dev;
  39         spinlock_t lock;
  40 };
  41
  42 #define MAX_KFIFO_SIZE  1024
  43
  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,
  47                                 loff_t *);
  48 static int kfd_smi_ev_release(struct inode *, struct file *);
  49
  50 static const char kfd_smi_name[] = "kfd_smi_ev";
  51
  52 static const struct file_operations kfd_smi_ev_fops = {
  53         .owner = THIS_MODULE,
  54         .poll = kfd_smi_ev_poll,
  55         .read = kfd_smi_ev_read,
  56         .write = kfd_smi_ev_write,
  57         .release = kfd_smi_ev_release
  58 };
  59
  60 static __poll_t kfd_smi_ev_poll(struct file *filep,
  61                                 struct poll_table_struct *wait)
  62 {
  63         struct kfd_smi_client *client = filep->private_data;
  64         __poll_t mask = 0;
  65
  66         poll_wait(filep, &client->wait_queue, wait);
  67
  68         spin_lock(&client->lock);
  69         if (!kfifo_is_empty(&client->fifo))
  70                 mask = EPOLLIN | EPOLLRDNORM;
  71         spin_unlock(&client->lock);
  72
  73         return mask;
  74 }
  75
  76 static ssize_t kfd_smi_ev_read(struct file *filep, char __user *user,
  77                                size_t size, loff_t *offset)
  78 {
  79         int ret;
  80         size_t to_copy;
  81         struct kfd_smi_client *client = filep->private_data;
  82         unsigned char *buf;
  83
  84         buf = kmalloc(MAX_KFIFO_SIZE * sizeof(*buf), GFP_KERNEL);
  85         if (!buf)
  86                 return -ENOMEM;
  87
  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.
  90          */
  91         spin_lock(&client->lock);
  92         to_copy = kfifo_len(&client->fifo);
  93         if (!to_copy) {
  94                 spin_unlock(&client->lock);
  95                 ret = -EAGAIN;
  96                 goto ret_err;
  97         }
  98         to_copy = min3(size, sizeof(buf), to_copy);
  99         ret = kfifo_out(&client->fifo, buf, to_copy);
 100         spin_unlock(&client->lock);
 101         if (ret <= 0) {
 102                 ret = -EAGAIN;
 103                 goto ret_err;
 104         }
 105
 106         ret = copy_to_user(user, buf, to_copy);
 107         if (ret) {
 108                 ret = -EFAULT;
 109                 goto ret_err;
 110         }
 111
 112         kfree(buf);
 113         return to_copy;
 114
 115 ret_err:
 116         kfree(buf);
 117         return ret;
 118 }
 119
 120 static ssize_t kfd_smi_ev_write(struct file *filep, const char __user *user,
 121                                 size_t size, loff_t *offset)
 122 {
 123         struct kfd_smi_client *client = filep->private_data;
 124         uint64_t events;
 125
 126         if (!access_ok(user, size) || size < sizeof(events))
 127                 return -EFAULT;
 128         if (copy_from_user(&events, user, sizeof(events)))
 129                 return -EFAULT;
 130
 131         WRITE_ONCE(client->events, events);
 132
 133         return sizeof(events);
 134 }
 135
 136 static int kfd_smi_ev_release(struct inode *inode, struct file *filep)
 137 {
 138         struct kfd_smi_client *client = filep->private_data;
 139         struct kfd_dev *dev = client->dev;
 140
 141         spin_lock(&dev->smi_lock);
 142         list_del_rcu(&client->list);
 143         spin_unlock(&dev->smi_lock);
 144
 145         synchronize_rcu();
 146         kfifo_free(&client->fifo);
 147         kfree(client);
 148
 149         return 0;
 150 }
 151
 152 static void add_event_to_kfifo(struct kfd_dev *dev, unsigned int smi_event,
 153                               char *event_msg, int len)
 154 {
 155         struct kfd_smi_client *client;
 156
 157         rcu_read_lock();
 158
 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)))
 162                         continue;
 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);
 167                 } else {
 168                         pr_debug("smi_event(EventID: %u): no space left\n",
 169                                         smi_event);
 170                 }
 171                 spin_unlock(&client->lock);
 172         }
 173
 174         rcu_read_unlock();
 175 }
 176
 177 void kfd_smi_event_update_gpu_reset(struct kfd_dev *dev, bool post_reset)
 178 {
 179         /*
 180          * GpuReset msg = Reset seq number (incremented for
 181          * every reset message sent before GPU reset).
 182          * 1 byte event + 1 byte space + 8 bytes seq num +
 183          * 1 byte \n + 1 byte \0 = 12
 184          */
 185         char fifo_in[12];
 186         int len;
 187         unsigned int event;
 188
 189         if (list_empty(&dev->smi_clients))
 190                 return;
 191
 192         memset(fifo_in, 0x0, sizeof(fifo_in));
 193
 194         if (post_reset) {
 195                 event = KFD_SMI_EVENT_GPU_POST_RESET;
 196         } else {
 197                 event = KFD_SMI_EVENT_GPU_PRE_RESET;
 198                 ++(dev->reset_seq_num);
 199         }
 200
 201         len = snprintf(fifo_in, sizeof(fifo_in), "%x %x\n", event,
 202                                                 dev->reset_seq_num);
 203
 204         add_event_to_kfifo(dev, event, fifo_in, len);
 205 }
 206
 207 void kfd_smi_event_update_thermal_throttling(struct kfd_dev *dev,
 208                                              uint32_t throttle_bitmask)
 209 {
 210         struct amdgpu_device *adev = (struct amdgpu_device *)dev->kgd;
 211         /*
 212          * ThermalThrottle msg = throttle_bitmask(8):
 213          *                       thermal_interrupt_count(16):
 214          * 1 byte event + 1 byte space + 8 byte throttle_bitmask +
 215          * 1 byte : + 16 byte thermal_interupt_counter + 1 byte \n +
 216          * 1 byte \0 = 29
 217          */
 218         char fifo_in[29];
 219         int len;
 220
 221         if (list_empty(&dev->smi_clients))
 222                 return;
 223
 224         len = snprintf(fifo_in, sizeof(fifo_in), "%x %x:%llx\n",
 225                        KFD_SMI_EVENT_THERMAL_THROTTLE, throttle_bitmask,
 226                        atomic64_read(&adev->smu.throttle_int_counter));
 227
 228         add_event_to_kfifo(dev, KFD_SMI_EVENT_THERMAL_THROTTLE, fifo_in, len);
 229 }
 230
 231 void kfd_smi_event_update_vmfault(struct kfd_dev *dev, uint16_t pasid)
 232 {
 233         struct amdgpu_device *adev = (struct amdgpu_device *)dev->kgd;
 234         struct amdgpu_task_info task_info;
 235         /* VmFault msg = (hex)uint32_pid(8) + :(1) + task name(16) = 25 */
 236         /* 1 byte event + 1 byte space + 25 bytes msg + 1 byte \n +
 237          * 1 byte \0 = 29
 238          */
 239         char fifo_in[29];
 240         int len;
 241
 242         if (list_empty(&dev->smi_clients))
 243                 return;
 244
 245         memset(&task_info, 0, sizeof(struct amdgpu_task_info));
 246         amdgpu_vm_get_task_info(adev, pasid, &task_info);
 247         /* Report VM faults from user applications, not retry from kernel */
 248         if (!task_info.pid)
 249                 return;
 250
 251         len = snprintf(fifo_in, sizeof(fifo_in), "%x %x:%s\n", KFD_SMI_EVENT_VMFAULT,
 252                 task_info.pid, task_info.task_name);
 253
 254         add_event_to_kfifo(dev, KFD_SMI_EVENT_VMFAULT, fifo_in, len);
 255 }
 256
 257 int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
 258 {
 259         struct kfd_smi_client *client;
 260         int ret;
 261
 262         client = kzalloc(sizeof(struct kfd_smi_client), GFP_KERNEL);
 263         if (!client)
 264                 return -ENOMEM;
 265         INIT_LIST_HEAD(&client->list);
 266
 267         ret = kfifo_alloc(&client->fifo, MAX_KFIFO_SIZE, GFP_KERNEL);
 268         if (ret) {
 269                 kfree(client);
 270                 return ret;
 271         }
 272
 273         ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
 274                                O_RDWR);
 275         if (ret < 0) {
 276                 kfifo_free(&client->fifo);
 277                 kfree(client);
 278                 return ret;
 279         }
 280         *fd = ret;
 281
 282         init_waitqueue_head(&client->wait_queue);
 283         spin_lock_init(&client->lock);
 284         client->events = 0;
 285         client->dev = dev;
 286
 287         spin_lock(&dev->smi_lock);
 288         list_add_rcu(&client->list, &dev->smi_clients);
 289         spin_unlock(&dev->smi_lock);
 290
 291         return 0;
 292 }