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         prop.cu_mask = NULL;
 140
 141         if (init_queue(&kq->queue, &prop) != 0)
 142                 goto err_init_queue;
 143
 144         kq->queue->device = dev;
 145         kq->queue->process = kfd_get_process(current);
 146
 147         kq->queue->mqd_mem_obj = kq->mqd_mgr->allocate_mqd(kq->mqd_mgr->dev,
 148                                         &kq->queue->properties);
 149         if (!kq->queue->mqd_mem_obj)
 150                 goto err_allocate_mqd;
 151         kq->mqd_mgr->init_mqd(kq->mqd_mgr, &kq->queue->mqd,
 152                                         kq->queue->mqd_mem_obj,
 153                                         &kq->queue->gart_mqd_addr,
 154                                         &kq->queue->properties);
 155         /* assign HIQ to HQD */
 156         if (type == KFD_QUEUE_TYPE_HIQ) {
 157                 pr_debug("Assigning hiq to hqd\n");
 158                 kq->queue->pipe = KFD_CIK_HIQ_PIPE;
 159                 kq->queue->queue = KFD_CIK_HIQ_QUEUE;
 160                 kq->mqd_mgr->load_mqd(kq->mqd_mgr, kq->queue->mqd,
 161                                 kq->queue->pipe, kq->queue->queue,
 162                                 &kq->queue->properties, NULL);
 163         } else {
 164                 /* allocate fence for DIQ */
 165
 166                 retval = kfd_gtt_sa_allocate(dev, sizeof(uint32_t),
 167                                                 &kq->fence_mem_obj);
 168
 169                 if (retval != 0)
 170                         goto err_alloc_fence;
 171
 172                 kq->fence_kernel_address = kq->fence_mem_obj->cpu_ptr;
 173                 kq->fence_gpu_addr = kq->fence_mem_obj->gpu_addr;
 174         }
 175
 176         print_queue(kq->queue);
 177
 178         return true;
 179 err_alloc_fence:
 180         kq->mqd_mgr->free_mqd(kq->mqd_mgr, kq->queue->mqd, kq->queue->mqd_mem_obj);
 181 err_allocate_mqd:
 182         uninit_queue(kq->queue);
 183 err_init_queue:
 184         kfd_gtt_sa_free(dev, kq->wptr_mem);
 185 err_wptr_allocate_vidmem:
 186         kfd_gtt_sa_free(dev, kq->rptr_mem);
 187 err_rptr_allocate_vidmem:
 188         kfd_gtt_sa_free(dev, kq->eop_mem);
 189 err_eop_allocate_vidmem:
 190         kfd_gtt_sa_free(dev, kq->pq);
 191 err_pq_allocate_vidmem:
 192         kfd_release_kernel_doorbell(dev, prop.doorbell_ptr);
 193 err_get_kernel_doorbell:
 194         return false;
 195
 196 }
 197
 198 /* Uninitialize a kernel queue and free all its memory usages. */
 199 static void kq_uninitialize(struct kernel_queue *kq, bool hanging)
 200 {
 201         if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ && !hanging)
 202                 kq->mqd_mgr->destroy_mqd(kq->mqd_mgr,
 203                                         kq->queue->mqd,
 204                                         KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
 205                                         KFD_UNMAP_LATENCY_MS,
 206                                         kq->queue->pipe,
 207                                         kq->queue->queue);
 208         else if (kq->queue->properties.type == KFD_QUEUE_TYPE_DIQ)
 209                 kfd_gtt_sa_free(kq->dev, kq->fence_mem_obj);
 210
 211         kq->mqd_mgr->free_mqd(kq->mqd_mgr, kq->queue->mqd,
 212                                 kq->queue->mqd_mem_obj);
 213
 214         kfd_gtt_sa_free(kq->dev, kq->rptr_mem);
 215         kfd_gtt_sa_free(kq->dev, kq->wptr_mem);
 216
 217         /* For CIK family asics, kq->eop_mem is Null, kfd_gtt_sa_free()
 218          * is able to handle NULL properly.
 219          */
 220         kfd_gtt_sa_free(kq->dev, kq->eop_mem);
 221
 222         kfd_gtt_sa_free(kq->dev, kq->pq);
 223         kfd_release_kernel_doorbell(kq->dev,
 224                                         kq->queue->properties.doorbell_ptr);
 225         uninit_queue(kq->queue);
 226 }
 227
 228 int kq_acquire_packet_buffer(struct kernel_queue *kq,
 229                 size_t packet_size_in_dwords, unsigned int **buffer_ptr)
 230 {
 231         size_t available_size;
 232         size_t queue_size_dwords;
 233         uint32_t wptr, rptr;
 234         uint64_t wptr64;
 235         unsigned int *queue_address;
 236
 237         /* When rptr == wptr, the buffer is empty.
 238          * When rptr == wptr + 1, the buffer is full.
 239          * It is always rptr that advances to the position of wptr, rather than
 240          * the opposite. So we can only use up to queue_size_dwords - 1 dwords.
 241          */
 242         rptr = *kq->rptr_kernel;
 243         wptr = kq->pending_wptr;
 244         wptr64 = kq->pending_wptr64;
 245         queue_address = (unsigned int *)kq->pq_kernel_addr;
 246         queue_size_dwords = kq->queue->properties.queue_size / 4;
 247
 248         pr_debug("rptr: %d\n", rptr);
 249         pr_debug("wptr: %d\n", wptr);
 250         pr_debug("queue_address 0x%p\n", queue_address);
 251
 252         available_size = (rptr + queue_size_dwords - 1 - wptr) %
 253                                                         queue_size_dwords;
 254
 255         if (packet_size_in_dwords > available_size) {
 256                 /*
 257                  * make sure calling functions know
 258                  * acquire_packet_buffer() failed
 259                  */
 260                 goto err_no_space;
 261         }
 262
 263         if (wptr + packet_size_in_dwords >= queue_size_dwords) {
 264                 /* make sure after rolling back to position 0, there is
 265                  * still enough space.
 266                  */
 267                 if (packet_size_in_dwords >= rptr)
 268                         goto err_no_space;
 269
 270                 /* fill nops, roll back and start at position 0 */
 271                 while (wptr > 0) {
 272                         queue_address[wptr] = kq->nop_packet;
 273                         wptr = (wptr + 1) % queue_size_dwords;
 274                         wptr64++;
 275                 }
 276         }
 277
 278         *buffer_ptr = &queue_address[wptr];
 279         kq->pending_wptr = wptr + packet_size_in_dwords;
 280         kq->pending_wptr64 = wptr64 + packet_size_in_dwords;
 281
 282         return 0;
 283
 284 err_no_space:
 285         *buffer_ptr = NULL;
 286         return -ENOMEM;
 287 }
 288
 289 void kq_submit_packet(struct kernel_queue *kq)
 290 {
 291 #ifdef DEBUG
 292         int i;
 293
 294         for (i = *kq->wptr_kernel; i < kq->pending_wptr; i++) {
 295                 pr_debug("0x%2X ", kq->pq_kernel_addr[i]);
 296                 if (i % 15 == 0)
 297                         pr_debug("\n");
 298         }
 299         pr_debug("\n");
 300 #endif
 301         if (kq->dev->device_info->doorbell_size == 8) {
 302                 *kq->wptr64_kernel = kq->pending_wptr64;
 303                 write_kernel_doorbell64(kq->queue->properties.doorbell_ptr,
 304                                         kq->pending_wptr64);
 305         } else {
 306                 *kq->wptr_kernel = kq->pending_wptr;
 307                 write_kernel_doorbell(kq->queue->properties.doorbell_ptr,
 308                                         kq->pending_wptr);
 309         }
 310 }
 311
 312 void kq_rollback_packet(struct kernel_queue *kq)
 313 {
 314         if (kq->dev->device_info->doorbell_size == 8) {
 315                 kq->pending_wptr64 = *kq->wptr64_kernel;
 316                 kq->pending_wptr = *kq->wptr_kernel %
 317                         (kq->queue->properties.queue_size / 4);
 318         } else {
 319                 kq->pending_wptr = *kq->wptr_kernel;
 320         }
 321 }
 322
 323 struct kernel_queue *kernel_queue_init(struct kfd_dev *dev,
 324                                         enum kfd_queue_type type)
 325 {
 326         struct kernel_queue *kq;
 327
 328         kq = kzalloc(sizeof(*kq), GFP_KERNEL);
 329         if (!kq)
 330                 return NULL;
 331
 332         if (kq_initialize(kq, dev, type, KFD_KERNEL_QUEUE_SIZE))
 333                 return kq;
 334
 335         pr_err("Failed to init kernel queue\n");
 336
 337         kfree(kq);
 338         return NULL;
 339 }
 340
 341 void kernel_queue_uninit(struct kernel_queue *kq, bool hanging)
 342 {
 343         kq_uninitialize(kq, hanging);
 344         kfree(kq);
 345 }
 346
 347 /* FIXME: Can this test be removed? */
 348 static __attribute__((unused)) void test_kq(struct kfd_dev *dev)
 349 {
 350         struct kernel_queue *kq;
 351         uint32_t *buffer, i;
 352         int retval;
 353
 354         pr_err("Starting kernel queue test\n");
 355
 356         kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_HIQ);
 357         if (unlikely(!kq)) {
 358                 pr_err("  Failed to initialize HIQ\n");
 359                 pr_err("Kernel queue test failed\n");
 360                 return;
 361         }
 362
 363         retval = kq_acquire_packet_buffer(kq, 5, &buffer);
 364         if (unlikely(retval != 0)) {
 365                 pr_err("  Failed to acquire packet buffer\n");
 366                 pr_err("Kernel queue test failed\n");
 367                 return;
 368         }
 369         for (i = 0; i < 5; i++)
 370                 buffer[i] = kq->nop_packet;
 371         kq_submit_packet(kq);
 372
 373         pr_err("Ending kernel queue test\n");
 374 }
 375
 376