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         if (WARN_ON(type != KFD_QUEUE_TYPE_DIQ && type != KFD_QUEUE_TYPE_HIQ))
  45                 return false;
  46
  47         pr_debug("Initializing queue type %d size %d\n", KFD_QUEUE_TYPE_HIQ,
  48                         queue_size);
  49
  50         memset(&prop, 0, sizeof(prop));
  51         memset(&nop, 0, sizeof(nop));
  52
  53         nop.opcode = IT_NOP;
  54         nop.type = PM4_TYPE_3;
  55         nop.u32all |= PM4_COUNT_ZERO;
  56
  57         kq->dev = dev;
  58         kq->nop_packet = nop.u32all;
  59         switch (type) {
  60         case KFD_QUEUE_TYPE_DIQ:
  61         case KFD_QUEUE_TYPE_HIQ:
  62                 kq->mqd = dev->dqm->ops.get_mqd_manager(dev->dqm,
  63                                                 KFD_MQD_TYPE_HIQ);
  64                 break;
  65         default:
  66                 pr_err("Invalid queue type %d\n", type);
  67                 return false;
  68         }
  69
  70         if (!kq->mqd)
  71                 return false;
  72
  73         prop.doorbell_ptr = kfd_get_kernel_doorbell(dev, &prop.doorbell_off);
  74
  75         if (!prop.doorbell_ptr) {
  76                 pr_err("Failed to initialize doorbell");
  77                 goto err_get_kernel_doorbell;
  78         }
  79
  80         retval = kfd_gtt_sa_allocate(dev, queue_size, &kq->pq);
  81         if (retval != 0) {
  82                 pr_err("Failed to init pq queues size %d\n", queue_size);
  83                 goto err_pq_allocate_vidmem;
  84         }
  85
  86         kq->pq_kernel_addr = kq->pq->cpu_ptr;
  87         kq->pq_gpu_addr = kq->pq->gpu_addr;
  88
  89         retval = kq->ops_asic_specific.initialize(kq, dev, type, queue_size);
  90         if (!retval)
  91                 goto err_eop_allocate_vidmem;
  92
  93         retval = kfd_gtt_sa_allocate(dev, sizeof(*kq->rptr_kernel),
  94                                         &kq->rptr_mem);
  95
  96         if (retval != 0)
  97                 goto err_rptr_allocate_vidmem;
  98
  99         kq->rptr_kernel = kq->rptr_mem->cpu_ptr;
 100         kq->rptr_gpu_addr = kq->rptr_mem->gpu_addr;
 101
 102         retval = kfd_gtt_sa_allocate(dev, sizeof(*kq->wptr_kernel),
 103                                         &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         prop.eop_ring_buffer_address = kq->eop_gpu_addr;
 125         prop.eop_ring_buffer_size = PAGE_SIZE;
 126
 127         if (init_queue(&kq->queue, &prop) != 0)
 128                 goto err_init_queue;
 129
 130         kq->queue->device = dev;
 131         kq->queue->process = kfd_get_process(current);
 132
 133         retval = kq->mqd->init_mqd(kq->mqd, &kq->queue->mqd,
 134                                         &kq->queue->mqd_mem_obj,
 135                                         &kq->queue->gart_mqd_addr,
 136                                         &kq->queue->properties);
 137         if (retval != 0)
 138                 goto err_init_mqd;
 139
 140         /* assign HIQ to HQD */
 141         if (type == KFD_QUEUE_TYPE_HIQ) {
 142                 pr_debug("Assigning hiq to hqd\n");
 143                 kq->queue->pipe = KFD_CIK_HIQ_PIPE;
 144                 kq->queue->queue = KFD_CIK_HIQ_QUEUE;
 145                 kq->mqd->load_mqd(kq->mqd, kq->queue->mqd, kq->queue->pipe,
 146                                   kq->queue->queue, &kq->queue->properties,
 147                                   NULL);
 148         } else {
 149                 /* allocate fence for DIQ */
 150
 151                 retval = kfd_gtt_sa_allocate(dev, sizeof(uint32_t),
 152                                                 &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         kfd_gtt_sa_free(dev, kq->wptr_mem);
 169 err_wptr_allocate_vidmem:
 170         kfd_gtt_sa_free(dev, kq->rptr_mem);
 171 err_rptr_allocate_vidmem:
 172         kfd_gtt_sa_free(dev, kq->eop_mem);
 173 err_eop_allocate_vidmem:
 174         kfd_gtt_sa_free(dev, kq->pq);
 175 err_pq_allocate_vidmem:
 176         kfd_release_kernel_doorbell(dev, prop.doorbell_ptr);
 177 err_get_kernel_doorbell:
 178         return false;
 179
 180 }
 181
 182 static void uninitialize(struct kernel_queue *kq)
 183 {
 184         if (kq->queue->properties.type == KFD_QUEUE_TYPE_HIQ)
 185                 kq->mqd->destroy_mqd(kq->mqd,
 186                                         kq->queue->mqd,
 187                                         KFD_PREEMPT_TYPE_WAVEFRONT_RESET,
 188                                         QUEUE_PREEMPT_DEFAULT_TIMEOUT_MS,
 189                                         kq->queue->pipe,
 190                                         kq->queue->queue);
 191         else if (kq->queue->properties.type == KFD_QUEUE_TYPE_DIQ)
 192                 kfd_gtt_sa_free(kq->dev, kq->fence_mem_obj);
 193
 194         kq->mqd->uninit_mqd(kq->mqd, kq->queue->mqd, kq->queue->mqd_mem_obj);
 195
 196         kfd_gtt_sa_free(kq->dev, kq->rptr_mem);
 197         kfd_gtt_sa_free(kq->dev, kq->wptr_mem);
 198         kq->ops_asic_specific.uninitialize(kq);
 199         kfd_gtt_sa_free(kq->dev, kq->pq);
 200         kfd_release_kernel_doorbell(kq->dev,
 201                                         kq->queue->properties.doorbell_ptr);
 202         uninit_queue(kq->queue);
 203 }
 204
 205 static int acquire_packet_buffer(struct kernel_queue *kq,
 206                 size_t packet_size_in_dwords, unsigned int **buffer_ptr)
 207 {
 208         size_t available_size;
 209         size_t queue_size_dwords;
 210         uint32_t wptr, rptr;
 211         unsigned int *queue_address;
 212
 213         /* When rptr == wptr, the buffer is empty.
 214          * When rptr == wptr + 1, the buffer is full.
 215          * It is always rptr that advances to the position of wptr, rather than
 216          * the opposite. So we can only use up to queue_size_dwords - 1 dwords.
 217          */
 218         rptr = *kq->rptr_kernel;
 219         wptr = *kq->wptr_kernel;
 220         queue_address = (unsigned int *)kq->pq_kernel_addr;
 221         queue_size_dwords = kq->queue->properties.queue_size / sizeof(uint32_t);
 222
 223         pr_debug("rptr: %d\n", rptr);
 224         pr_debug("wptr: %d\n", wptr);
 225         pr_debug("queue_address 0x%p\n", queue_address);
 226
 227         available_size = (rptr + queue_size_dwords - 1 - wptr) %
 228                                                         queue_size_dwords;
 229
 230         if (packet_size_in_dwords > available_size) {
 231                 /*
 232                  * make sure calling functions know
 233                  * acquire_packet_buffer() failed
 234                  */
 235                 *buffer_ptr = NULL;
 236                 return -ENOMEM;
 237         }
 238
 239         if (wptr + packet_size_in_dwords >= queue_size_dwords) {
 240                 /* make sure after rolling back to position 0, there is
 241                  * still enough space.
 242                  */
 243                 if (packet_size_in_dwords >= rptr) {
 244                         *buffer_ptr = NULL;
 245                         return -ENOMEM;
 246                 }
 247                 /* fill nops, roll back and start at position 0 */
 248                 while (wptr > 0) {
 249                         queue_address[wptr] = kq->nop_packet;
 250                         wptr = (wptr + 1) % queue_size_dwords;
 251                 }
 252         }
 253
 254         *buffer_ptr = &queue_address[wptr];
 255         kq->pending_wptr = wptr + packet_size_in_dwords;
 256
 257         return 0;
 258 }
 259
 260 static void submit_packet(struct kernel_queue *kq)
 261 {
 262 #ifdef DEBUG
 263         int i;
 264
 265         for (i = *kq->wptr_kernel; i < kq->pending_wptr; i++) {
 266                 pr_debug("0x%2X ", kq->pq_kernel_addr[i]);
 267                 if (i % 15 == 0)
 268                         pr_debug("\n");
 269         }
 270         pr_debug("\n");
 271 #endif
 272
 273         *kq->wptr_kernel = kq->pending_wptr;
 274         write_kernel_doorbell(kq->queue->properties.doorbell_ptr,
 275                                 kq->pending_wptr);
 276 }
 277
 278 static void rollback_packet(struct kernel_queue *kq)
 279 {
 280         kq->pending_wptr = *kq->queue->properties.write_ptr;
 281 }
 282
 283 struct kernel_queue *kernel_queue_init(struct kfd_dev *dev,
 284                                         enum kfd_queue_type type)
 285 {
 286         struct kernel_queue *kq;
 287
 288         kq = kzalloc(sizeof(*kq), GFP_KERNEL);
 289         if (!kq)
 290                 return NULL;
 291
 292         kq->ops.initialize = initialize;
 293         kq->ops.uninitialize = uninitialize;
 294         kq->ops.acquire_packet_buffer = acquire_packet_buffer;
 295         kq->ops.submit_packet = submit_packet;
 296         kq->ops.rollback_packet = rollback_packet;
 297
 298         switch (dev->device_info->asic_family) {
 299         case CHIP_CARRIZO:
 300                 kernel_queue_init_vi(&kq->ops_asic_specific);
 301                 break;
 302
 303         case CHIP_KAVERI:
 304                 kernel_queue_init_cik(&kq->ops_asic_specific);
 305                 break;
 306         }
 307
 308         if (!kq->ops.initialize(kq, dev, type, KFD_KERNEL_QUEUE_SIZE)) {
 309                 pr_err("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         kq->ops.uninitialize(kq);
 319         kfree(kq);
 320 }
 321
 322 /* FIXME: Can this test be removed? */
 323 static __attribute__((unused)) void test_kq(struct kfd_dev *dev)
 324 {
 325         struct kernel_queue *kq;
 326         uint32_t *buffer, i;
 327         int retval;
 328
 329         pr_err("Starting kernel queue test\n");
 330
 331         kq = kernel_queue_init(dev, KFD_QUEUE_TYPE_HIQ);
 332         if (unlikely(!kq)) {
 333                 pr_err("  Failed to initialize HIQ\n");
 334                 pr_err("Kernel queue test failed\n");
 335                 return;
 336         }
 337
 338         retval = kq->ops.acquire_packet_buffer(kq, 5, &buffer);
 339         if (unlikely(retval != 0)) {
 340                 pr_err("  Failed to acquire packet buffer\n");
 341                 pr_err("Kernel queue test failed\n");
 342                 return;
 343         }
 344         for (i = 0; i < 5; i++)
 345                 buffer[i] = kq->nop_packet;
 346         kq->ops.submit_packet(kq);
 347
 348         pr_err("Ending kernel queue test\n");
 349 }
 350
 351