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 /* Initialize a kernel queue, including allocations of GART memory
  38  * needed for the queue.
  39  */
  40 static bool kq_initialize(struct kernel_queue *kq, struct kfd_dev *dev,
  41                 enum kfd_queue_type type, unsigned int queue_size)
  42 {
  43         struct queue_properties prop;
  44         int retval;
  45         union PM4_MES_TYPE_3_HEADER nop;
  46
  47         if (WARN_ON(type != KFD_QUEUE_TYPE_DIQ && type != KFD_QUEUE_TYPE_HIQ))
  48                 return false;
  49
  50         pr_debug("Initializing queue type %d size %d\n", KFD_QUEUE_TYPE_HIQ,
  51                         queue_size);
  52
  53         memset(&prop, 0, sizeof(prop));
  54         memset(&nop, 0, sizeof(nop));
  55
  56         nop.opcode = IT_NOP;
  57         nop.type = PM4_TYPE_3;
  58         nop.u32all |= PM4_COUNT_ZERO;
  59
  60         kq->dev = dev;
  61         kq->nop_packet = nop.u32all;
  62         switch (type) {
  63         case KFD_QUEUE_TYPE_DIQ:
  64                 kq->mqd_mgr = dev->dqm->mqd_mgrs[KFD_MQD_TYPE_DIQ];
  65                 break;
  66         case KFD_QUEUE_TYPE_HIQ:
  67                 kq->mqd_mgr = dev->dqm->mqd_mgrs[KFD_MQD_TYPE_HIQ];
  68                 break;
  69         default:
  70                 pr_err("Invalid queue type %d\n", type);
  71                 return false;
  72         }
  73
  74         if (!kq->mqd_mgr)
  75                 return false;
  76
  77         prop.doorbell_ptr = kfd_get_kernel_doorbell(dev, &prop.doorbell_off);
  78
  79         if (!prop.doorbell_ptr) {
  80                 pr_err("Failed to initialize doorbell");
  81                 goto err_get_kernel_doorbell;
  82         }
  83
  84         retval = kfd_gtt_sa_allocate(dev, queue_size, &kq->pq);
  85         if (retval != 0) {
  86                 pr_err("Failed to init pq queues size %d\n", queue_size);
  87                 goto err_pq_allocate_vidmem;
  88         }
  89
  90         kq->pq_kernel_addr = kq->pq->cpu_ptr;
  91         kq->pq_gpu_addr = kq->pq->gpu_addr;
  92
  93         /* For CIK family asics, kq->eop_mem is not needed */
  94         if (dev->device_info->asic_family > CHIP_MULLINS) {
  95                 retval = kfd_gtt_sa_allocate(dev, PAGE_SIZE, &kq->eop_mem);
  96                 if (retval != 0)
  97                         goto err_eop_allocate_vidmem;
  98
  99                 kq->eop_gpu_addr = kq->eop_mem->gpu_addr;
 100                 kq->eop_kernel_addr = kq->eop_mem->cpu_ptr;
 101
 102                 memset(kq->eop_kernel_addr, 0, PAGE_SIZE);
 103         }
 104
 105         retval = kfd_gtt_sa_allocate(dev, sizeof(*kq->rptr_kernel),
 106                                         &kq->rptr_mem);
 107
 108         if (retval != 0)
 109                 goto err_rptr_allocate_vidmem;
 110
 111         kq->rptr_kernel = kq->rptr_mem->cpu_ptr;
 112         kq->rptr_gpu_addr = kq->rptr_mem->gpu_addr;
 113
 114         retval = kfd_gtt_sa_allocate(dev, dev->device_info->doorbell_size,
 115                                         &kq->wptr_mem);
 116
 117         if (retval != 0)
 118                 goto err_wptr_allocate_vidmem;
 119
 120         kq->wptr_kernel = kq->wptr_mem->cpu_ptr;
 121         kq->wptr_gpu_addr = kq->wptr_mem->gpu_addr;
 122
 123         memset(kq->pq_kernel_addr, 0, queue_size);
 124         memset(kq->rptr_kernel, 0, sizeof(*kq->rptr_kernel));
 125         memset(kq->wptr_kernel, 0, sizeof(*kq->wptr_kernel));
 126
 127         prop.queue_size = queue_size;
 128         prop.is_interop = false;
 129         prop.is_gws = false;
 130         prop.priority = 1;
 131         prop.queue_percent = 100;
 132         prop.type = type;
 133         prop.vmid = 0;
 134         prop.queue_address = kq->pq_gpu_addr;
 135         prop.read_ptr = (uint32_t *) kq->rptr_gpu_addr;
 136         prop.write_ptr = (uint32_t *) kq->wptr_gpu_addr;
 137         prop.eop_ring_buffer_address = kq->eop_gpu_addr;
 138         prop.eop_ring_buffer_size = PAGE_SIZE;
 139
 140         if (init_queue(&kq->queue, &prop) != 0)
 141                 goto err_init_queue;
 142
 143         kq->queue->device = dev;
 144         kq->queue->process = kfd_get_process(current);
 145
 146         kq->queue->mqd_mem_obj = kq->mqd_mgr->allocate_mqd(kq->mqd_mgr->dev,
 147                                         &kq->queue->properties);
 148         if (!kq->queue->mqd_mem_obj)
 149                 goto err_allocate_mqd;
 150         kq->mqd_mgr->init_mqd(kq->mqd_mgr, &kq->queue->mqd,
 151                                         kq->queue->mqd_mem_obj,
 152                                         &kq->queue->gart_mqd_addr,
 153                                         &kq->queue->properties);
 154         /* assign HIQ to HQD */
 155         if (type == KFD_QUEUE_TYPE_HIQ) {
 156                 pr_debug("Assigning hiq to hqd\n");
 157                 kq->queue->pipe = KFD_CIK_HIQ_PIPE;
 158                 kq->queue->queue = KFD_CIK_HIQ_QUEUE;
 159                 kq->mqd_mgr->load_mqd(kq->mqd_mgr, kq->queue->mqd,
 160                                 kq->queue->pipe, kq->queue->queue,
 161                                 &kq->queue->properties, NULL);
 162         } else {
 163                 /* allocate fence for DIQ */
 164
 165                 retval = kfd_gtt_sa_allocate(dev, sizeof(uint32_t),
 166                                                 &kq->fence_mem_obj);
 167
 168                 if (retval != 0)
 169                         goto err_alloc_fence;
 170
 171                 kq->fence_kernel_address = kq->fence_mem_obj->cpu_ptr;
 172                 kq->fence_gpu_addr = kq->fence_mem_obj->gpu_addr;
 173         }
 174
 175         print_queue(kq->queue);
 176
 177         return true;
 178 err_alloc_fence:
 179         kq->mqd_mgr->free_mqd(kq->mqd_mgr, kq->queue->mqd, kq->queue->mqd_mem_obj);
 180 err_allocate_mqd:
 181         uninit_queue(kq->queue);
 182 err_init_queue:
 183         kfd_gtt_sa_free(dev, kq->wptr_mem);
 184 err_wptr_allocate_vidmem:
 185         kfd_gtt_sa_free(dev, kq->rptr_mem);
 186 err_rptr_allocate_vidmem:
 187         kfd_gtt_sa_free(dev, kq->eop_mem);
 188 err_eop_allocate_vidmem:
 189         kfd_gtt_sa_free(dev, kq->pq);
 190 err_pq_allocate_vidmem:
 191         kfd_release_kernel_doorbell(dev, prop.doorbell_ptr);
 192 err_get_kernel_doorbell:
 193         return false;
 194
 195 }
 196
 197 /* Uninitialize a kernel queue and free all its memory usages. */
 198 static void kq_uninitialize(struct kernel_queue *kq, bool hanging)
 199 {
 200         if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ && !hanging)
 201                 kq->mqd_mgr->destroy_mqd(kq->mqd_mgr,
 202                                         kq->queue->mqd,
 203                                         KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
 204                                         KFD_UNMAP_LATENCY_MS,
 205                                         kq->queue->pipe,
 206                                         kq->queue->queue);
 207         else if (kq->queue->properties.type == KFD_QUEUE_TYPE_DIQ)
 208                 kfd_gtt_sa_free(kq->dev, kq->fence_mem_obj);
 209
 210         kq->mqd_mgr->free_mqd(kq->mqd_mgr, kq->queue->mqd,
 211                                 kq->queue->mqd_mem_obj);
 212
 213         kfd_gtt_sa_free(kq->dev, kq->rptr_mem);
 214         kfd_gtt_sa_free(kq->dev, kq->wptr_mem);
 215
 216         /* For CIK family asics, kq->eop_mem is Null, kfd_gtt_sa_free()
 217          * is able to handle NULL properly.
 218          */
 219         kfd_gtt_sa_free(kq->dev, kq->eop_mem);
 220
 221         kfd_gtt_sa_free(kq->dev, kq->pq);
 222         kfd_release_kernel_doorbell(kq->dev,
 223                                         kq->queue->properties.doorbell_ptr);
 224         uninit_queue(kq->queue);
 225 }
 226
 227 int kq_acquire_packet_buffer(struct kernel_queue *kq,
 228                 size_t packet_size_in_dwords, unsigned int **buffer_ptr)
 229 {
 230         size_t available_size;
 231         size_t queue_size_dwords;
 232         uint32_t wptr, rptr;
 233         uint64_t wptr64;
 234         unsigned int *queue_address;
 235
 236         /* When rptr == wptr, the buffer is empty.
 237          * When rptr == wptr + 1, the buffer is full.
 238          * It is always rptr that advances to the position of wptr, rather than
 239          * the opposite. So we can only use up to queue_size_dwords - 1 dwords.
 240          */
 241         rptr = *kq->rptr_kernel;
 242         wptr = kq->pending_wptr;
 243         wptr64 = kq->pending_wptr64;
 244         queue_address = (unsigned int *)kq->pq_kernel_addr;
 245         queue_size_dwords = kq->queue->properties.queue_size / 4;
 246
 247         pr_debug("rptr: %d\n", rptr);
 248         pr_debug("wptr: %d\n", wptr);
 249         pr_debug("queue_address 0x%p\n", queue_address);
 250
 251         available_size = (rptr + queue_size_dwords - 1 - wptr) %
 252                                                         queue_size_dwords;
 253
 254         if (packet_size_in_dwords > available_size) {
 255                 /*
 256                  * make sure calling functions know
 257                  * acquire_packet_buffer() failed
 258                  */
 259                 goto err_no_space;
 260         }
 261
 262         if (wptr + packet_size_in_dwords >= queue_size_dwords) {
 263                 /* make sure after rolling back to position 0, there is
 264                  * still enough space.
 265                  */
 266                 if (packet_size_in_dwords >= rptr)
 267                         goto err_no_space;
 268
 269                 /* fill nops, roll back and start at position 0 */
 270                 while (wptr > 0) {
 271                         queue_address[wptr] = kq->nop_packet;
 272                         wptr = (wptr + 1) % queue_size_dwords;
 273                         wptr64++;
 274                 }
 275         }
 276
 277         *buffer_ptr = &queue_address[wptr];
 278         kq->pending_wptr = wptr + packet_size_in_dwords;
 279         kq->pending_wptr64 = wptr64 + packet_size_in_dwords;
 280
 281         return 0;
 282
 283 err_no_space:
 284         *buffer_ptr = NULL;
 285         return -ENOMEM;
 286 }
 287
 288 void kq_submit_packet(struct kernel_queue *kq)
 289 {
 290 #ifdef DEBUG
 291         int i;
 292
 293         for (i = *kq->wptr_kernel; i < kq->pending_wptr; i++) {
 294                 pr_debug("0x%2X ", kq->pq_kernel_addr[i]);
 295                 if (i % 15 == 0)
 296                         pr_debug("\n");
 297         }
 298         pr_debug("\n");
 299 #endif
 300         if (kq->dev->device_info->doorbell_size == 8) {
 301                 *kq->wptr64_kernel = kq->pending_wptr64;
 302                 write_kernel_doorbell64(kq->queue->properties.doorbell_ptr,
 303                                         kq->pending_wptr64);
 304         } else {
 305                 *kq->wptr_kernel = kq->pending_wptr;
 306                 write_kernel_doorbell(kq->queue->properties.doorbell_ptr,
 307                                         kq->pending_wptr);
 308         }
 309 }
 310
 311 void kq_rollback_packet(struct kernel_queue *kq)
 312 {
 313         if (kq->dev->device_info->doorbell_size == 8) {
 314                 kq->pending_wptr64 = *kq->wptr64_kernel;
 315                 kq->pending_wptr = *kq->wptr_kernel %
 316                         (kq->queue->properties.queue_size / 4);
 317         } else {
 318                 kq->pending_wptr = *kq->wptr_kernel;
 319         }
 320 }
 321
 322 struct kernel_queue *kernel_queue_init(struct kfd_dev *dev,
 323                                         enum kfd_queue_type type)
 324 {
 325         struct kernel_queue *kq;
 326
 327         kq = kzalloc(sizeof(*kq), GFP_KERNEL);
 328         if (!kq)
 329                 return NULL;
 330
 331         if (kq_initialize(kq, dev, type, KFD_KERNEL_QUEUE_SIZE))
 332                 return kq;
 333
 334         pr_err("Failed to init kernel queue\n");
 335
 336         kfree(kq);
 337         return NULL;
 338 }
 339
 340 void kernel_queue_uninit(struct kernel_queue *kq, bool hanging)
 341 {
 342         kq_uninitialize(kq, hanging);
 343         kfree(kq);
 344 }
 345
 346 /* FIXME: Can this test be removed? */
 347 static __attribute__((unused)) void test_kq(struct kfd_dev *dev)
 348 {
 349         struct kernel_queue *kq;
 350         uint32_t *buffer, i;
 351         int retval;
 352
 353         pr_err("Starting kernel queue test\n");
 354
 355         kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_HIQ);
 356         if (unlikely(!kq)) {
 357                 pr_err("  Failed to initialize HIQ\n");
 358                 pr_err("Kernel queue test failed\n");
 359                 return;
 360         }
 361
 362         retval = kq_acquire_packet_buffer(kq, 5, &buffer);
 363         if (unlikely(retval != 0)) {
 364                 pr_err("  Failed to acquire packet buffer\n");
 365                 pr_err("Kernel queue test failed\n");
 366                 return;
 367         }
 368         for (i = 0; i < 5; i++)
 369                 buffer[i] = kq->nop_packet;
 370         kq_submit_packet(kq);
 371
 372         pr_err("Ending kernel queue test\n");
 373 }
 374
 375