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

   1 // SPDX-License-Identifier: GPL-2.0 OR MIT
   2 /*
   3  * Copyright 2014-2022 Advanced Micro Devices, Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include <linux/types.h>
  26 #include <linux/mutex.h>
  27 #include <linux/slab.h>
  28 #include <linux/printk.h>
  29 #include <linux/sched.h>
  30 #include "kfd_kernel_queue.h"
  31 #include "kfd_priv.h"
  32 #include "kfd_device_queue_manager.h"
  33 #include "kfd_pm4_headers.h"
  34 #include "kfd_pm4_opcodes.h"
  35 #include "amdgpu_reset.h"
  36
  37 #define PM4_COUNT_ZERO (((1 << 15) - 1) << 16)
  38
  39 /* Initialize a kernel queue, including allocations of GART memory
  40  * needed for the queue.
  41  */
  42 static bool kq_initialize(struct kernel_queue *kq, struct kfd_node *dev,
  43                 enum kfd_queue_type type, unsigned int queue_size)
  44 {
  45         struct queue_properties prop;
  46         int retval;
  47         union PM4_MES_TYPE_3_HEADER nop;
  48
  49         if (WARN_ON(type != KFD_QUEUE_TYPE_DIQ && type != KFD_QUEUE_TYPE_HIQ))
  50                 return false;
  51
  52         pr_debug("Initializing queue type %d size %d\n", KFD_QUEUE_TYPE_HIQ,
  53                         queue_size);
  54
  55         memset(&prop, 0, sizeof(prop));
  56         memset(&nop, 0, sizeof(nop));
  57
  58         nop.opcode = IT_NOP;
  59         nop.type = PM4_TYPE_3;
  60         nop.u32all |= PM4_COUNT_ZERO;
  61
  62         kq->dev = dev;
  63         kq->nop_packet = nop.u32all;
  64         switch (type) {
  65         case KFD_QUEUE_TYPE_DIQ:
  66                 kq->mqd_mgr = dev->dqm->mqd_mgrs[KFD_MQD_TYPE_DIQ];
  67                 break;
  68         case KFD_QUEUE_TYPE_HIQ:
  69                 kq->mqd_mgr = dev->dqm->mqd_mgrs[KFD_MQD_TYPE_HIQ];
  70                 break;
  71         default:
  72                 dev_err(dev->adev->dev, "Invalid queue type %d\n", type);
  73                 return false;
  74         }
  75
  76         if (!kq->mqd_mgr)
  77                 return false;
  78
  79         prop.doorbell_ptr = kfd_get_kernel_doorbell(dev->kfd, &prop.doorbell_off);
  80
  81         if (!prop.doorbell_ptr) {
  82                 dev_err(dev->adev->dev, "Failed to initialize doorbell");
  83                 goto err_get_kernel_doorbell;
  84         }
  85
  86         retval = kfd_gtt_sa_allocate(dev, queue_size, &kq->pq);
  87         if (retval != 0) {
  88                 dev_err(dev->adev->dev, "Failed to init pq queues size %d\n",
  89                         queue_size);
  90                 goto err_pq_allocate_vidmem;
  91         }
  92
  93         kq->pq_kernel_addr = kq->pq->cpu_ptr;
  94         kq->pq_gpu_addr = kq->pq->gpu_addr;
  95
  96         /* For CIK family asics, kq->eop_mem is not needed */
  97         if (dev->adev->asic_type > CHIP_MULLINS) {
  98                 retval = kfd_gtt_sa_allocate(dev, PAGE_SIZE, &kq->eop_mem);
  99                 if (retval != 0)
 100                         goto err_eop_allocate_vidmem;
 101
 102                 kq->eop_gpu_addr = kq->eop_mem->gpu_addr;
 103                 kq->eop_kernel_addr = kq->eop_mem->cpu_ptr;
 104
 105                 memset(kq->eop_kernel_addr, 0, PAGE_SIZE);
 106         }
 107
 108         retval = kfd_gtt_sa_allocate(dev, sizeof(*kq->rptr_kernel),
 109                                         &kq->rptr_mem);
 110
 111         if (retval != 0)
 112                 goto err_rptr_allocate_vidmem;
 113
 114         kq->rptr_kernel = kq->rptr_mem->cpu_ptr;
 115         kq->rptr_gpu_addr = kq->rptr_mem->gpu_addr;
 116
 117         retval = kfd_gtt_sa_allocate(dev, dev->kfd->device_info.doorbell_size,
 118                                         &kq->wptr_mem);
 119
 120         if (retval != 0)
 121                 goto err_wptr_allocate_vidmem;
 122
 123         kq->wptr_kernel = kq->wptr_mem->cpu_ptr;
 124         kq->wptr_gpu_addr = kq->wptr_mem->gpu_addr;
 125
 126         memset(kq->pq_kernel_addr, 0, queue_size);
 127         memset(kq->rptr_kernel, 0, sizeof(*kq->rptr_kernel));
 128         memset(kq->wptr_kernel, 0, dev->kfd->device_info.doorbell_size);
 129
 130         prop.queue_size = queue_size;
 131         prop.is_interop = false;
 132         prop.is_gws = false;
 133         prop.priority = 1;
 134         prop.queue_percent = 100;
 135         prop.type = type;
 136         prop.vmid = 0;
 137         prop.queue_address = kq->pq_gpu_addr;
 138         prop.read_ptr = (uint32_t *) kq->rptr_gpu_addr;
 139         prop.write_ptr = (uint32_t *) kq->wptr_gpu_addr;
 140         prop.eop_ring_buffer_address = kq->eop_gpu_addr;
 141         prop.eop_ring_buffer_size = PAGE_SIZE;
 142
 143         if (init_queue(&kq->queue, &prop) != 0)
 144                 goto err_init_queue;
 145
 146         kq->queue->device = dev;
 147         kq->queue->process = kfd_get_process(current);
 148
 149         kq->queue->mqd_mem_obj = kq->mqd_mgr->allocate_mqd(kq->mqd_mgr->dev,
 150                                         &kq->queue->properties);
 151         if (!kq->queue->mqd_mem_obj)
 152                 goto err_allocate_mqd;
 153         kq->mqd_mgr->init_mqd(kq->mqd_mgr, &kq->queue->mqd,
 154                                         kq->queue->mqd_mem_obj,
 155                                         &kq->queue->gart_mqd_addr,
 156                                         &kq->queue->properties);
 157         /* assign HIQ to HQD */
 158         if (type == KFD_QUEUE_TYPE_HIQ) {
 159                 pr_debug("Assigning hiq to hqd\n");
 160                 kq->queue->pipe = KFD_CIK_HIQ_PIPE;
 161                 kq->queue->queue = KFD_CIK_HIQ_QUEUE;
 162                 kq->mqd_mgr->load_mqd(kq->mqd_mgr, kq->queue->mqd,
 163                                 kq->queue->pipe, kq->queue->queue,
 164                                 &kq->queue->properties, NULL);
 165         } else {
 166                 /* allocate fence for DIQ */
 167
 168                 retval = kfd_gtt_sa_allocate(dev, sizeof(uint32_t),
 169                                                 &kq->fence_mem_obj);
 170
 171                 if (retval != 0)
 172                         goto err_alloc_fence;
 173
 174                 kq->fence_kernel_address = kq->fence_mem_obj->cpu_ptr;
 175                 kq->fence_gpu_addr = kq->fence_mem_obj->gpu_addr;
 176         }
 177
 178         print_queue(kq->queue);
 179
 180         return true;
 181 err_alloc_fence:
 182         kq->mqd_mgr->free_mqd(kq->mqd_mgr, kq->queue->mqd, kq->queue->mqd_mem_obj);
 183 err_allocate_mqd:
 184         uninit_queue(kq->queue);
 185 err_init_queue:
 186         kfd_gtt_sa_free(dev, kq->wptr_mem);
 187 err_wptr_allocate_vidmem:
 188         kfd_gtt_sa_free(dev, kq->rptr_mem);
 189 err_rptr_allocate_vidmem:
 190         kfd_gtt_sa_free(dev, kq->eop_mem);
 191 err_eop_allocate_vidmem:
 192         kfd_gtt_sa_free(dev, kq->pq);
 193 err_pq_allocate_vidmem:
 194         kfd_release_kernel_doorbell(dev->kfd, prop.doorbell_ptr);
 195 err_get_kernel_doorbell:
 196         return false;
 197
 198 }
 199
 200 /* Uninitialize a kernel queue and free all its memory usages. */
 201 static void kq_uninitialize(struct kernel_queue *kq)
 202 {
 203         if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ && down_read_trylock(&kq->dev->adev->reset_domain->sem)) {
 204                 kq->mqd_mgr->destroy_mqd(kq->mqd_mgr,
 205                                         kq->queue->mqd,
 206                                         KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
 207                                         KFD_UNMAP_LATENCY_MS,
 208                                         kq->queue->pipe,
 209                                         kq->queue->queue);
 210                 up_read(&kq->dev->adev->reset_domain->sem);
 211         }
 212         else if (kq->queue->properties.type == KFD_QUEUE_TYPE_DIQ)
 213                 kfd_gtt_sa_free(kq->dev, kq->fence_mem_obj);
 214
 215         kq->mqd_mgr->free_mqd(kq->mqd_mgr, kq->queue->mqd,
 216                                 kq->queue->mqd_mem_obj);
 217
 218         kfd_gtt_sa_free(kq->dev, kq->rptr_mem);
 219         kfd_gtt_sa_free(kq->dev, kq->wptr_mem);
 220
 221         /* For CIK family asics, kq->eop_mem is Null, kfd_gtt_sa_free()
 222          * is able to handle NULL properly.
 223          */
 224         kfd_gtt_sa_free(kq->dev, kq->eop_mem);
 225
 226         kfd_gtt_sa_free(kq->dev, kq->pq);
 227         kfd_release_kernel_doorbell(kq->dev->kfd,
 228                                         kq->queue->properties.doorbell_ptr);
 229         uninit_queue(kq->queue);
 230 }
 231
 232 int kq_acquire_packet_buffer(struct kernel_queue *kq,
 233                 size_t packet_size_in_dwords, unsigned int **buffer_ptr)
 234 {
 235         size_t available_size;
 236         size_t queue_size_dwords;
 237         uint32_t wptr, rptr;
 238         uint64_t wptr64;
 239         unsigned int *queue_address;
 240
 241         /* When rptr == wptr, the buffer is empty.
 242          * When rptr == wptr + 1, the buffer is full.
 243          * It is always rptr that advances to the position of wptr, rather than
 244          * the opposite. So we can only use up to queue_size_dwords - 1 dwords.
 245          */
 246         rptr = *kq->rptr_kernel;
 247         wptr = kq->pending_wptr;
 248         wptr64 = kq->pending_wptr64;
 249         queue_address = (unsigned int *)kq->pq_kernel_addr;
 250         queue_size_dwords = kq->queue->properties.queue_size / 4;
 251
 252         pr_debug("rptr: %d\n", rptr);
 253         pr_debug("wptr: %d\n", wptr);
 254         pr_debug("queue_address 0x%p\n", queue_address);
 255
 256         available_size = (rptr + queue_size_dwords - 1 - wptr) %
 257                                                         queue_size_dwords;
 258
 259         if (packet_size_in_dwords > available_size) {
 260                 /*
 261                  * make sure calling functions know
 262                  * acquire_packet_buffer() failed
 263                  */
 264                 goto err_no_space;
 265         }
 266
 267         if (wptr + packet_size_in_dwords >= queue_size_dwords) {
 268                 /* make sure after rolling back to position 0, there is
 269                  * still enough space.
 270                  */
 271                 if (packet_size_in_dwords >= rptr)
 272                         goto err_no_space;
 273
 274                 /* fill nops, roll back and start at position 0 */
 275                 while (wptr > 0) {
 276                         queue_address[wptr] = kq->nop_packet;
 277                         wptr = (wptr + 1) % queue_size_dwords;
 278                         wptr64++;
 279                 }
 280         }
 281
 282         *buffer_ptr = &queue_address[wptr];
 283         kq->pending_wptr = wptr + packet_size_in_dwords;
 284         kq->pending_wptr64 = wptr64 + packet_size_in_dwords;
 285
 286         return 0;
 287
 288 err_no_space:
 289         *buffer_ptr = NULL;
 290         return -ENOMEM;
 291 }
 292
 293 int kq_submit_packet(struct kernel_queue *kq)
 294 {
 295 #ifdef DEBUG
 296         int i;
 297
 298         for (i = *kq->wptr_kernel; i < kq->pending_wptr; i++) {
 299                 pr_debug("0x%2X ", kq->pq_kernel_addr[i]);
 300                 if (i % 15 == 0)
 301                         pr_debug("\n");
 302         }
 303         pr_debug("\n");
 304 #endif
 305         /* Fatal err detected, packet submission won't go through */
 306         if (amdgpu_amdkfd_is_fed(kq->dev->adev))
 307                 return -EIO;
 308
 309         /* Make sure ring buffer is updated before wptr updated */
 310         mb();
 311
 312         if (kq->dev->kfd->device_info.doorbell_size == 8) {
 313                 *kq->wptr64_kernel = kq->pending_wptr64;
 314                 mb(); /* Make sure wptr updated before ring doorbell */
 315                 write_kernel_doorbell64(kq->queue->properties.doorbell_ptr,
 316                                         kq->pending_wptr64);
 317         } else {
 318                 *kq->wptr_kernel = kq->pending_wptr;
 319                 mb(); /* Make sure wptr updated before ring doorbell */
 320                 write_kernel_doorbell(kq->queue->properties.doorbell_ptr,
 321                                         kq->pending_wptr);
 322         }
 323
 324         return 0;
 325 }
 326
 327 void kq_rollback_packet(struct kernel_queue *kq)
 328 {
 329         if (kq->dev->kfd->device_info.doorbell_size == 8) {
 330                 kq->pending_wptr64 = *kq->wptr64_kernel;
 331                 kq->pending_wptr = *kq->wptr_kernel %
 332                         (kq->queue->properties.queue_size / 4);
 333         } else {
 334                 kq->pending_wptr = *kq->wptr_kernel;
 335         }
 336 }
 337
 338 struct kernel_queue *kernel_queue_init(struct kfd_node *dev,
 339                                         enum kfd_queue_type type)
 340 {
 341         struct kernel_queue *kq;
 342
 343         kq = kzalloc(sizeof(*kq), GFP_KERNEL);
 344         if (!kq)
 345                 return NULL;
 346
 347         if (kq_initialize(kq, dev, type, KFD_KERNEL_QUEUE_SIZE))
 348                 return kq;
 349
 350         dev_err(dev->adev->dev, "Failed to init kernel queue\n");
 351
 352         kfree(kq);
 353         return NULL;
 354 }
 355
 356 void kernel_queue_uninit(struct kernel_queue *kq)
 357 {
 358         kq_uninitialize(kq);
 359         kfree(kq);
 360 }
 361
 362 /* FIXME: Can this test be removed? */
 363 static __attribute__((unused)) void test_kq(struct kfd_node *dev)
 364 {
 365         struct kernel_queue *kq;
 366         uint32_t *buffer, i;
 367         int retval;
 368
 369         dev_err(dev->adev->dev, "Starting kernel queue test\n");
 370
 371         kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_HIQ);
 372         if (unlikely(!kq)) {
 373                 dev_err(dev->adev->dev, "  Failed to initialize HIQ\n");
 374                 dev_err(dev->adev->dev, "Kernel queue test failed\n");
 375                 return;
 376         }
 377
 378         retval = kq_acquire_packet_buffer(kq, 5, &buffer);
 379         if (unlikely(retval != 0)) {
 380                 dev_err(dev->adev->dev, "  Failed to acquire packet buffer\n");
 381                 dev_err(dev->adev->dev, "Kernel queue test failed\n");
 382                 return;
 383         }
 384         for (i = 0; i < 5; i++)
 385                 buffer[i] = kq->nop_packet;
 386         kq_submit_packet(kq);
 387
 388         dev_err(dev->adev->dev, "Ending kernel queue test\n");
 389 }
 390
 391