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

   1 /*
   2  * Copyright 2014 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
  24 #include <linux/types.h>
  25 #include <linux/mutex.h>
  26 #include <linux/slab.h>
  27 #include <linux/printk.h>
  28 #include <linux/sched.h>
  29 #include "kfd_kernel_queue.h"
  30 #include "kfd_priv.h"
  31 #include "kfd_device_queue_manager.h"
  32 #include "kfd_pm4_headers.h"
  33 #include "kfd_pm4_opcodes.h"
  34
  35 #define PM4_COUNT_ZERO (((1 << 15) - 1) << 16)
  36
  37 static bool initialize(struct kernel_queue *kq, struct kfd_dev *dev,
  38                 enum kfd_queue_type type, unsigned int queue_size)
  39 {
  40         struct queue_properties prop;
  41         int retval;
  42         union PM4_MES_TYPE_3_HEADER nop;
  43
  44         BUG_ON(!kq || !dev);
  45         BUG_ON(type != KFD_QUEUE_TYPE_DIQ && type != KFD_QUEUE_TYPE_HIQ);
  46
  47         pr_debug("kfd: In func %s initializing queue type %d size %d\n",
  48                         __func__, KFD_QUEUE_TYPE_HIQ, queue_size);
  49
  50         nop.opcode = IT_NOP;
  51         nop.type = PM4_TYPE_3;
  52         nop.u32all |= PM4_COUNT_ZERO;
  53
  54         kq->dev = dev;
  55         kq->nop_packet = nop.u32all;
  56         switch (type) {
  57         case KFD_QUEUE_TYPE_DIQ:
  58         case KFD_QUEUE_TYPE_HIQ:
  59                 kq->mqd = dev->dqm->get_mqd_manager(dev->dqm,
  60                                                 KFD_MQD_TYPE_CIK_HIQ);
  61                 break;
  62         default:
  63                 BUG();
  64                 break;
  65         }
  66
  67         if (kq->mqd == NULL)
  68                 return false;
  69
  70         prop.doorbell_ptr = kfd_get_kernel_doorbell(dev, &prop.doorbell_off);
  71
  72         if (prop.doorbell_ptr == NULL)
  73                 goto err_get_kernel_doorbell;
  74
  75         retval = kfd2kgd->allocate_mem(dev->kgd,
  76                                         queue_size,
  77                                         PAGE_SIZE,
  78                                         KFD_MEMPOOL_SYSTEM_WRITECOMBINE,
  79                                         (struct kgd_mem **) &kq->pq);
  80
  81         if (retval != 0)
  82                 goto err_pq_allocate_vidmem;
  83
  84         kq->pq_kernel_addr = kq->pq->cpu_ptr;
  85         kq->pq_gpu_addr = kq->pq->gpu_addr;
  86
  87         retval = kfd2kgd->allocate_mem(dev->kgd,
  88                                         sizeof(*kq->rptr_kernel),
  89                                         32,
  90                                         KFD_MEMPOOL_SYSTEM_WRITECOMBINE,
  91                                         (struct kgd_mem **) &kq->rptr_mem);
  92
  93         if (retval != 0)
  94                 goto err_rptr_allocate_vidmem;
  95
  96         kq->rptr_kernel = kq->rptr_mem->cpu_ptr;
  97         kq->rptr_gpu_addr = kq->rptr_mem->gpu_addr;
  98
  99         retval = kfd2kgd->allocate_mem(dev->kgd,
 100                                         sizeof(*kq->wptr_kernel),
 101                                         32,
 102                                         KFD_MEMPOOL_SYSTEM_WRITECOMBINE,
 103                                         (struct kgd_mem **) &kq->wptr_mem);
 104
 105         if (retval != 0)
 106                 goto err_wptr_allocate_vidmem;
 107
 108         kq->wptr_kernel = kq->wptr_mem->cpu_ptr;
 109         kq->wptr_gpu_addr = kq->wptr_mem->gpu_addr;
 110
 111         memset(kq->pq_kernel_addr, 0, queue_size);
 112         memset(kq->rptr_kernel, 0, sizeof(*kq->rptr_kernel));
 113         memset(kq->wptr_kernel, 0, sizeof(*kq->wptr_kernel));
 114
 115         prop.queue_size = queue_size;
 116         prop.is_interop = false;
 117         prop.priority = 1;
 118         prop.queue_percent = 100;
 119         prop.type = type;
 120         prop.vmid = 0;
 121         prop.queue_address = kq->pq_gpu_addr;
 122         prop.read_ptr = (uint32_t *) kq->rptr_gpu_addr;
 123         prop.write_ptr = (uint32_t *) kq->wptr_gpu_addr;
 124
 125         if (init_queue(&kq->queue, prop) != 0)
 126                 goto err_init_queue;
 127
 128         kq->queue->device = dev;
 129         kq->queue->process = kfd_get_process(current);
 130
 131         retval = kq->mqd->init_mqd(kq->mqd, &kq->queue->mqd,
 132                                         &kq->queue->mqd_mem_obj,
 133                                         &kq->queue->gart_mqd_addr,
 134                                         &kq->queue->properties);
 135         if (retval != 0)
 136                 goto err_init_mqd;
 137
 138         /* assign HIQ to HQD */
 139         if (type == KFD_QUEUE_TYPE_HIQ) {
 140                 pr_debug("assigning hiq to hqd\n");
 141                 kq->queue->pipe = KFD_CIK_HIQ_PIPE;
 142                 kq->queue->queue = KFD_CIK_HIQ_QUEUE;
 143                 kq->mqd->load_mqd(kq->mqd, kq->queue->mqd, kq->queue->pipe,
 144                                         kq->queue->queue, NULL);
 145         } else {
 146                 /* allocate fence for DIQ */
 147
 148                 retval = kfd2kgd->allocate_mem(dev->kgd,
 149                                         sizeof(uint32_t),
 150                                         32,
 151                                         KFD_MEMPOOL_SYSTEM_WRITECOMBINE,
 152                                         (struct kgd_mem **) &kq->fence_mem_obj);
 153
 154                 if (retval != 0)
 155                         goto err_alloc_fence;
 156
 157                 kq->fence_kernel_address = kq->fence_mem_obj->cpu_ptr;
 158                 kq->fence_gpu_addr = kq->fence_mem_obj->gpu_addr;
 159         }
 160
 161         print_queue(kq->queue);
 162
 163         return true;
 164 err_alloc_fence:
 165 err_init_mqd:
 166         uninit_queue(kq->queue);
 167 err_init_queue:
 168         kfd2kgd->free_mem(dev->kgd, (struct kgd_mem *) kq->wptr_mem);
 169 err_wptr_allocate_vidmem:
 170         kfd2kgd->free_mem(dev->kgd, (struct kgd_mem *) kq->rptr_mem);
 171 err_rptr_allocate_vidmem:
 172         kfd2kgd->free_mem(dev->kgd, (struct kgd_mem *) kq->pq);
 173 err_pq_allocate_vidmem:
 174         pr_err("kfd: error init pq\n");
 175         kfd_release_kernel_doorbell(dev, prop.doorbell_ptr);
 176 err_get_kernel_doorbell:
 177         pr_err("kfd: error init doorbell");
 178         return false;
 179
 180 }
 181
 182 static void uninitialize(struct kernel_queue *kq)
 183 {
 184         BUG_ON(!kq);
 185
 186         if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ)
 187                 kq->mqd->destroy_mqd(kq->mqd,
 188                                         NULL,
 189                                         false,
 190                                         QUEUE_PREEMPT_DEFAULT_TIMEOUT_MS,
 191                                         kq->queue->pipe,
 192                                         kq->queue->queue);
 193
 194         kfd2kgd->free_mem(kq->dev->kgd, (struct kgd_mem *) kq->rptr_mem);
 195         kfd2kgd->free_mem(kq->dev->kgd, (struct kgd_mem *) kq->wptr_mem);
 196         kfd2kgd->free_mem(kq->dev->kgd, (struct kgd_mem *) kq->pq);
 197         kfd_release_kernel_doorbell(kq->dev,
 198                                         kq->queue->properties.doorbell_ptr);
 199         uninit_queue(kq->queue);
 200 }
 201
 202 static int acquire_packet_buffer(struct kernel_queue *kq,
 203                 size_t packet_size_in_dwords, unsigned int **buffer_ptr)
 204 {
 205         size_t available_size;
 206         size_t queue_size_dwords;
 207         uint32_t wptr, rptr;
 208         unsigned int *queue_address;
 209
 210         BUG_ON(!kq || !buffer_ptr);
 211
 212         rptr = *kq->rptr_kernel;
 213         wptr = *kq->wptr_kernel;
 214         queue_address = (unsigned int *)kq->pq_kernel_addr;
 215         queue_size_dwords = kq->queue->properties.queue_size / sizeof(uint32_t);
 216
 217         pr_debug("kfd: In func %s\nrptr: %d\nwptr: %d\nqueue_address 0x%p\n",
 218                         __func__, rptr, wptr, queue_address);
 219
 220         available_size = (rptr - 1 - wptr + queue_size_dwords) %
 221                                                         queue_size_dwords;
 222
 223         if (packet_size_in_dwords >= queue_size_dwords ||
 224                         packet_size_in_dwords >= available_size)
 225                 return -ENOMEM;
 226
 227         if (wptr + packet_size_in_dwords >= queue_size_dwords) {
 228                 while (wptr > 0) {
 229                         queue_address[wptr] = kq->nop_packet;
 230                         wptr = (wptr + 1) % queue_size_dwords;
 231                 }
 232         }
 233
 234         *buffer_ptr = &queue_address[wptr];
 235         kq->pending_wptr = wptr + packet_size_in_dwords;
 236
 237         return 0;
 238 }
 239
 240 static void submit_packet(struct kernel_queue *kq)
 241 {
 242 #ifdef DEBUG
 243         int i;
 244 #endif
 245
 246         BUG_ON(!kq);
 247
 248 #ifdef DEBUG
 249         for (i = *kq->wptr_kernel; i < kq->pending_wptr; i++) {
 250                 pr_debug("0x%2X ", kq->pq_kernel_addr[i]);
 251                 if (i % 15 == 0)
 252                         pr_debug("\n");
 253         }
 254         pr_debug("\n");
 255 #endif
 256
 257         *kq->wptr_kernel = kq->pending_wptr;
 258         write_kernel_doorbell(kq->queue->properties.doorbell_ptr,
 259                                 kq->pending_wptr);
 260 }
 261
 262 static int sync_with_hw(struct kernel_queue *kq, unsigned long timeout_ms)
 263 {
 264         unsigned long org_timeout_ms;
 265
 266         BUG_ON(!kq);
 267
 268         org_timeout_ms = timeout_ms;
 269         timeout_ms += jiffies * 1000 / HZ;
 270         while (*kq->wptr_kernel != *kq->rptr_kernel) {
 271                 if (time_after(jiffies * 1000 / HZ, timeout_ms)) {
 272                         pr_err("kfd: kernel_queue %s timeout expired %lu\n",
 273                                 __func__, org_timeout_ms);
 274                         pr_err("kfd: wptr: %d rptr: %d\n",
 275                                 *kq->wptr_kernel, *kq->rptr_kernel);
 276                         return -ETIME;
 277                 }
 278                 schedule();
 279         }
 280
 281         return 0;
 282 }
 283
 284 static void rollback_packet(struct kernel_queue *kq)
 285 {
 286         BUG_ON(!kq);
 287         kq->pending_wptr = *kq->queue->properties.write_ptr;
 288 }
 289
 290 struct kernel_queue *kernel_queue_init(struct kfd_dev *dev,
 291                                         enum kfd_queue_type type)
 292 {
 293         struct kernel_queue *kq;
 294
 295         BUG_ON(!dev);
 296
 297         kq = kzalloc(sizeof(struct kernel_queue), GFP_KERNEL);
 298         if (!kq)
 299                 return NULL;
 300
 301         kq->initialize = initialize;
 302         kq->uninitialize = uninitialize;
 303         kq->acquire_packet_buffer = acquire_packet_buffer;
 304         kq->submit_packet = submit_packet;
 305         kq->sync_with_hw = sync_with_hw;
 306         kq->rollback_packet = rollback_packet;
 307
 308         if (kq->initialize(kq, dev, type, KFD_KERNEL_QUEUE_SIZE) == false) {
 309                 pr_err("kfd: failed to init kernel queue\n");
 310                 kfree(kq);
 311                 return NULL;
 312         }
 313         return kq;
 314 }
 315
 316 void kernel_queue_uninit(struct kernel_queue *kq)
 317 {
 318         BUG_ON(!kq);
 319
 320         kq->uninitialize(kq);
 321         kfree(kq);
 322 }
 323
 324 static __attribute__((unused)) void test_kq(struct kfd_dev *dev)
 325 {
 326         struct kernel_queue *kq;
 327         uint32_t *buffer, i;
 328         int retval;
 329
 330         BUG_ON(!dev);
 331
 332         pr_debug("kfd: starting kernel queue test\n");
 333
 334         kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_HIQ);
 335         BUG_ON(!kq);
 336
 337         retval = kq->acquire_packet_buffer(kq, 5, &buffer);
 338         BUG_ON(retval != 0);
 339         for (i = 0; i < 5; i++)
 340                 buffer[i] = kq->nop_packet;
 341         kq->submit_packet(kq);
 342         kq->sync_with_hw(kq, 1000);
 343
 344         pr_debug("kfd: ending kernel queue test\n");
 345 }
 346
 347