drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Jerome Glisse.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Dave Airlie
  25  *          Alex Deucher
  26  *          Jerome Glisse
  27  *          Christian König
  28  */
  29 #include <linux/seq_file.h>
  30 #include <linux/slab.h>
  31 #include <drm/drmP.h>
  32 #include <drm/amdgpu_drm.h>
  33 #include "amdgpu.h"
  34 #include "atom.h"
  35
  36 /*
  37  * Rings
  38  * Most engines on the GPU are fed via ring buffers.  Ring
  39  * buffers are areas of GPU accessible memory that the host
  40  * writes commands into and the GPU reads commands out of.
  41  * There is a rptr (read pointer) that determines where the
  42  * GPU is currently reading, and a wptr (write pointer)
  43  * which determines where the host has written.  When the
  44  * pointers are equal, the ring is idle.  When the host
  45  * writes commands to the ring buffer, it increments the
  46  * wptr.  The GPU then starts fetching commands and executes
  47  * them until the pointers are equal again.
  48  */
  49 static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring);
  50
  51 /**
  52  * amdgpu_ring_alloc - allocate space on the ring buffer
  53  *
  54  * @adev: amdgpu_device pointer
  55  * @ring: amdgpu_ring structure holding ring information
  56  * @ndw: number of dwords to allocate in the ring buffer
  57  *
  58  * Allocate @ndw dwords in the ring buffer (all asics).
  59  * Returns 0 on success, error on failure.
  60  */
  61 int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw)
  62 {
  63         /* Align requested size with padding so unlock_commit can
  64          * pad safely */
  65         ndw = (ndw + ring->align_mask) & ~ring->align_mask;
  66
  67         /* Make sure we aren't trying to allocate more space
  68          * than the maximum for one submission
  69          */
  70         if (WARN_ON_ONCE(ndw > ring->max_dw))
  71                 return -ENOMEM;
  72
  73         ring->count_dw = ndw;
  74         ring->wptr_old = ring->wptr;
  75         return 0;
  76 }
  77
  78 /** amdgpu_ring_insert_nop - insert NOP packets
  79  *
  80  * @ring: amdgpu_ring structure holding ring information
  81  * @count: the number of NOP packets to insert
  82  *
  83  * This is the generic insert_nop function for rings except SDMA
  84  */
  85 void amdgpu_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
  86 {
  87         int i;
  88
  89         for (i = 0; i < count; i++)
  90                 amdgpu_ring_write(ring, ring->nop);
  91 }
  92
  93 /** amdgpu_ring_generic_pad_ib - pad IB with NOP packets
  94  *
  95  * @ring: amdgpu_ring structure holding ring information
  96  * @ib: IB to add NOP packets to
  97  *
  98  * This is the generic pad_ib function for rings except SDMA
  99  */
 100 void amdgpu_ring_generic_pad_ib(struct amdgpu_ring *ring, struct amdgpu_ib *ib)
 101 {
 102         while (ib->length_dw & ring->align_mask)
 103                 ib->ptr[ib->length_dw++] = ring->nop;
 104 }
 105
 106 /**
 107  * amdgpu_ring_commit - tell the GPU to execute the new
 108  * commands on the ring buffer
 109  *
 110  * @adev: amdgpu_device pointer
 111  * @ring: amdgpu_ring structure holding ring information
 112  *
 113  * Update the wptr (write pointer) to tell the GPU to
 114  * execute new commands on the ring buffer (all asics).
 115  */
 116 void amdgpu_ring_commit(struct amdgpu_ring *ring)
 117 {
 118         uint32_t count;
 119
 120         /* We pad to match fetch size */
 121         count = ring->align_mask + 1 - (ring->wptr & ring->align_mask);
 122         count %= ring->align_mask + 1;
 123         ring->funcs->insert_nop(ring, count);
 124
 125         mb();
 126         amdgpu_ring_set_wptr(ring);
 127 }
 128
 129 /**
 130  * amdgpu_ring_undo - reset the wptr
 131  *
 132  * @ring: amdgpu_ring structure holding ring information
 133  *
 134  * Reset the driver's copy of the wptr (all asics).
 135  */
 136 void amdgpu_ring_undo(struct amdgpu_ring *ring)
 137 {
 138         ring->wptr = ring->wptr_old;
 139 }
 140
 141 /**
 142  * amdgpu_ring_backup - Back up the content of a ring
 143  *
 144  * @ring: the ring we want to back up
 145  *
 146  * Saves all unprocessed commits from a ring, returns the number of dwords saved.
 147  */
 148 unsigned amdgpu_ring_backup(struct amdgpu_ring *ring,
 149                             uint32_t **data)
 150 {
 151         unsigned size, ptr, i;
 152
 153         *data = NULL;
 154
 155         if (ring->ring_obj == NULL)
 156                 return 0;
 157
 158         /* it doesn't make sense to save anything if all fences are signaled */
 159         if (!amdgpu_fence_count_emitted(ring))
 160                 return 0;
 161
 162         ptr = le32_to_cpu(*ring->next_rptr_cpu_addr);
 163
 164         size = ring->wptr + (ring->ring_size / 4);
 165         size -= ptr;
 166         size &= ring->ptr_mask;
 167         if (size == 0)
 168                 return 0;
 169
 170         /* and then save the content of the ring */
 171         *data = kmalloc_array(size, sizeof(uint32_t), GFP_KERNEL);
 172         if (!*data)
 173                 return 0;
 174         for (i = 0; i < size; ++i) {
 175                 (*data)[i] = ring->ring[ptr++];
 176                 ptr &= ring->ptr_mask;
 177         }
 178
 179         return size;
 180 }
 181
 182 /**
 183  * amdgpu_ring_restore - append saved commands to the ring again
 184  *
 185  * @ring: ring to append commands to
 186  * @size: number of dwords we want to write
 187  * @data: saved commands
 188  *
 189  * Allocates space on the ring and restore the previously saved commands.
 190  */
 191 int amdgpu_ring_restore(struct amdgpu_ring *ring,
 192                         unsigned size, uint32_t *data)
 193 {
 194         int i, r;
 195
 196         if (!size || !data)
 197                 return 0;
 198
 199         /* restore the saved ring content */
 200         r = amdgpu_ring_alloc(ring, size);
 201         if (r)
 202                 return r;
 203
 204         for (i = 0; i < size; ++i) {
 205                 amdgpu_ring_write(ring, data[i]);
 206         }
 207
 208         amdgpu_ring_commit(ring);
 209         kfree(data);
 210         return 0;
 211 }
 212
 213 /**
 214  * amdgpu_ring_init - init driver ring struct.
 215  *
 216  * @adev: amdgpu_device pointer
 217  * @ring: amdgpu_ring structure holding ring information
 218  * @ring_size: size of the ring
 219  * @nop: nop packet for this ring
 220  *
 221  * Initialize the driver information for the selected ring (all asics).
 222  * Returns 0 on success, error on failure.
 223  */
 224 int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
 225                      unsigned ring_size, u32 nop, u32 align_mask,
 226                      struct amdgpu_irq_src *irq_src, unsigned irq_type,
 227                      enum amdgpu_ring_type ring_type)
 228 {
 229         u32 rb_bufsz;
 230         int r;
 231
 232         if (ring->adev == NULL) {
 233                 if (adev->num_rings >= AMDGPU_MAX_RINGS)
 234                         return -EINVAL;
 235
 236                 ring->adev = adev;
 237                 ring->idx = adev->num_rings++;
 238                 adev->rings[ring->idx] = ring;
 239                 r = amdgpu_fence_driver_init_ring(ring,
 240                         amdgpu_sched_hw_submission);
 241                 if (r)
 242                         return r;
 243         }
 244
 245         r = amdgpu_wb_get(adev, &ring->rptr_offs);
 246         if (r) {
 247                 dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r);
 248                 return r;
 249         }
 250
 251         r = amdgpu_wb_get(adev, &ring->wptr_offs);
 252         if (r) {
 253                 dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r);
 254                 return r;
 255         }
 256
 257         r = amdgpu_wb_get(adev, &ring->fence_offs);
 258         if (r) {
 259                 dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r);
 260                 return r;
 261         }
 262
 263         r = amdgpu_wb_get(adev, &ring->next_rptr_offs);
 264         if (r) {
 265                 dev_err(adev->dev, "(%d) ring next_rptr wb alloc failed\n", r);
 266                 return r;
 267         }
 268         ring->next_rptr_gpu_addr = adev->wb.gpu_addr + (ring->next_rptr_offs * 4);
 269         ring->next_rptr_cpu_addr = &adev->wb.wb[ring->next_rptr_offs];
 270         spin_lock_init(&ring->fence_lock);
 271         r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type);
 272         if (r) {
 273                 dev_err(adev->dev, "failed initializing fences (%d).\n", r);
 274                 return r;
 275         }
 276
 277         /* Align ring size */
 278         rb_bufsz = order_base_2(ring_size / 8);
 279         ring_size = (1 << (rb_bufsz + 1)) * 4;
 280         ring->ring_size = ring_size;
 281         ring->align_mask = align_mask;
 282         ring->nop = nop;
 283         ring->type = ring_type;
 284
 285         /* Allocate ring buffer */
 286         if (ring->ring_obj == NULL) {
 287                 r = amdgpu_bo_create(adev, ring->ring_size, PAGE_SIZE, true,
 288                                      AMDGPU_GEM_DOMAIN_GTT, 0,
 289                                      NULL, NULL, &ring->ring_obj);
 290                 if (r) {
 291                         dev_err(adev->dev, "(%d) ring create failed\n", r);
 292                         return r;
 293                 }
 294                 r = amdgpu_bo_reserve(ring->ring_obj, false);
 295                 if (unlikely(r != 0))
 296                         return r;
 297                 r = amdgpu_bo_pin(ring->ring_obj, AMDGPU_GEM_DOMAIN_GTT,
 298                                         &ring->gpu_addr);
 299                 if (r) {
 300                         amdgpu_bo_unreserve(ring->ring_obj);
 301                         dev_err(adev->dev, "(%d) ring pin failed\n", r);
 302                         return r;
 303                 }
 304                 r = amdgpu_bo_kmap(ring->ring_obj,
 305                                        (void **)&ring->ring);
 306                 amdgpu_bo_unreserve(ring->ring_obj);
 307                 if (r) {
 308                         dev_err(adev->dev, "(%d) ring map failed\n", r);
 309                         return r;
 310                 }
 311         }
 312         ring->ptr_mask = (ring->ring_size / 4) - 1;
 313         ring->max_dw = DIV_ROUND_UP(ring->ring_size / 4,
 314                                     amdgpu_sched_hw_submission);
 315
 316         if (amdgpu_debugfs_ring_init(adev, ring)) {
 317                 DRM_ERROR("Failed to register debugfs file for rings !\n");
 318         }
 319         return 0;
 320 }
 321
 322 /**
 323  * amdgpu_ring_fini - tear down the driver ring struct.
 324  *
 325  * @adev: amdgpu_device pointer
 326  * @ring: amdgpu_ring structure holding ring information
 327  *
 328  * Tear down the driver information for the selected ring (all asics).
 329  */
 330 void amdgpu_ring_fini(struct amdgpu_ring *ring)
 331 {
 332         int r;
 333         struct amdgpu_bo *ring_obj;
 334
 335         ring_obj = ring->ring_obj;
 336         ring->ready = false;
 337         ring->ring = NULL;
 338         ring->ring_obj = NULL;
 339
 340         amdgpu_wb_free(ring->adev, ring->fence_offs);
 341         amdgpu_wb_free(ring->adev, ring->rptr_offs);
 342         amdgpu_wb_free(ring->adev, ring->wptr_offs);
 343         amdgpu_wb_free(ring->adev, ring->next_rptr_offs);
 344
 345         if (ring_obj) {
 346                 r = amdgpu_bo_reserve(ring_obj, false);
 347                 if (likely(r == 0)) {
 348                         amdgpu_bo_kunmap(ring_obj);
 349                         amdgpu_bo_unpin(ring_obj);
 350                         amdgpu_bo_unreserve(ring_obj);
 351                 }
 352                 amdgpu_bo_unref(&ring_obj);
 353         }
 354 }
 355
 356 /*
 357  * Debugfs info
 358  */
 359 #if defined(CONFIG_DEBUG_FS)
 360
 361 static int amdgpu_debugfs_ring_info(struct seq_file *m, void *data)
 362 {
 363         struct drm_info_node *node = (struct drm_info_node *) m->private;
 364         struct drm_device *dev = node->minor->dev;
 365         struct amdgpu_device *adev = dev->dev_private;
 366         int roffset = *(int*)node->info_ent->data;
 367         struct amdgpu_ring *ring = (void *)(((uint8_t*)adev) + roffset);
 368
 369         uint32_t rptr, wptr, rptr_next;
 370         unsigned i;
 371
 372         wptr = amdgpu_ring_get_wptr(ring);
 373         seq_printf(m, "wptr: 0x%08x [%5d]\n", wptr, wptr);
 374
 375         rptr = amdgpu_ring_get_rptr(ring);
 376         rptr_next = le32_to_cpu(*ring->next_rptr_cpu_addr);
 377
 378         seq_printf(m, "rptr: 0x%08x [%5d]\n", rptr, rptr);
 379
 380         seq_printf(m, "driver's copy of the wptr: 0x%08x [%5d]\n",
 381                    ring->wptr, ring->wptr);
 382
 383         if (!ring->ready)
 384                 return 0;
 385
 386         /* print 8 dw before current rptr as often it's the last executed
 387          * packet that is the root issue
 388          */
 389         i = (rptr + ring->ptr_mask + 1 - 32) & ring->ptr_mask;
 390         while (i != rptr) {
 391                 seq_printf(m, "r[%5d]=0x%08x", i, ring->ring[i]);
 392                 if (i == rptr)
 393                         seq_puts(m, " *");
 394                 if (i == rptr_next)
 395                         seq_puts(m, " #");
 396                 seq_puts(m, "\n");
 397                 i = (i + 1) & ring->ptr_mask;
 398         }
 399         while (i != wptr) {
 400                 seq_printf(m, "r[%5d]=0x%08x", i, ring->ring[i]);
 401                 if (i == rptr)
 402                         seq_puts(m, " *");
 403                 if (i == rptr_next)
 404                         seq_puts(m, " #");
 405                 seq_puts(m, "\n");
 406                 i = (i + 1) & ring->ptr_mask;
 407         }
 408         return 0;
 409 }
 410
 411 /* TODO: clean this up !*/
 412 static int amdgpu_gfx_index = offsetof(struct amdgpu_device, gfx.gfx_ring[0]);
 413 static int cayman_cp1_index = offsetof(struct amdgpu_device, gfx.compute_ring[0]);
 414 static int cayman_cp2_index = offsetof(struct amdgpu_device, gfx.compute_ring[1]);
 415 static int amdgpu_dma1_index = offsetof(struct amdgpu_device, sdma.instance[0].ring);
 416 static int amdgpu_dma2_index = offsetof(struct amdgpu_device, sdma.instance[1].ring);
 417 static int r600_uvd_index = offsetof(struct amdgpu_device, uvd.ring);
 418 static int si_vce1_index = offsetof(struct amdgpu_device, vce.ring[0]);
 419 static int si_vce2_index = offsetof(struct amdgpu_device, vce.ring[1]);
 420
 421 static struct drm_info_list amdgpu_debugfs_ring_info_list[] = {
 422         {"amdgpu_ring_gfx", amdgpu_debugfs_ring_info, 0, &amdgpu_gfx_index},
 423         {"amdgpu_ring_cp1", amdgpu_debugfs_ring_info, 0, &cayman_cp1_index},
 424         {"amdgpu_ring_cp2", amdgpu_debugfs_ring_info, 0, &cayman_cp2_index},
 425         {"amdgpu_ring_dma1", amdgpu_debugfs_ring_info, 0, &amdgpu_dma1_index},
 426         {"amdgpu_ring_dma2", amdgpu_debugfs_ring_info, 0, &amdgpu_dma2_index},
 427         {"amdgpu_ring_uvd", amdgpu_debugfs_ring_info, 0, &r600_uvd_index},
 428         {"amdgpu_ring_vce1", amdgpu_debugfs_ring_info, 0, &si_vce1_index},
 429         {"amdgpu_ring_vce2", amdgpu_debugfs_ring_info, 0, &si_vce2_index},
 430 };
 431
 432 #endif
 433
 434 static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring)
 435 {
 436 #if defined(CONFIG_DEBUG_FS)
 437         unsigned i;
 438         for (i = 0; i < ARRAY_SIZE(amdgpu_debugfs_ring_info_list); ++i) {
 439                 struct drm_info_list *info = &amdgpu_debugfs_ring_info_list[i];
 440                 int roffset = *(int*)amdgpu_debugfs_ring_info_list[i].data;
 441                 struct amdgpu_ring *other = (void *)(((uint8_t*)adev) + roffset);
 442                 unsigned r;
 443
 444                 if (other != ring)
 445                         continue;
 446
 447                 r = amdgpu_debugfs_add_files(adev, info, 1);
 448                 if (r)
 449                         return r;
 450         }
 451 #endif
 452         return 0;
 453 }