sys/dev/drm/radeon/ni_dma.c

   1 /*
   2  * Copyright 2010 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  * Authors: Alex Deucher
  23  */
  24 #include <drm/drmP.h>
  25 #include "radeon.h"
  26 #include "radeon_asic.h"
  27 #ifdef TRACE_TODO
  28 #include "radeon_trace.h"
  29 #endif
  30 #include "nid.h"
  31
  32 /*
  33  * DMA
  34  * Starting with R600, the GPU has an asynchronous
  35  * DMA engine.  The programming model is very similar
  36  * to the 3D engine (ring buffer, IBs, etc.), but the
  37  * DMA controller has it's own packet format that is
  38  * different form the PM4 format used by the 3D engine.
  39  * It supports copying data, writing embedded data,
  40  * solid fills, and a number of other things.  It also
  41  * has support for tiling/detiling of buffers.
  42  * Cayman and newer support two asynchronous DMA engines.
  43  */
  44
  45 /**
  46  * cayman_dma_get_rptr - get the current read pointer
  47  *
  48  * @rdev: radeon_device pointer
  49  * @ring: radeon ring pointer
  50  *
  51  * Get the current rptr from the hardware (cayman+).
  52  */
  53 uint32_t cayman_dma_get_rptr(struct radeon_device *rdev,
  54                              struct radeon_ring *ring)
  55 {
  56         u32 rptr, reg;
  57
  58         if (rdev->wb.enabled) {
  59                 rptr = rdev->wb.wb[ring->rptr_offs/4];
  60         } else {
  61                 if (ring->idx == R600_RING_TYPE_DMA_INDEX)
  62                         reg = DMA_RB_RPTR + DMA0_REGISTER_OFFSET;
  63                 else
  64                         reg = DMA_RB_RPTR + DMA1_REGISTER_OFFSET;
  65
  66                 rptr = RREG32(reg);
  67         }
  68
  69         return (rptr & 0x3fffc) >> 2;
  70 }
  71
  72 /**
  73  * cayman_dma_get_wptr - get the current write pointer
  74  *
  75  * @rdev: radeon_device pointer
  76  * @ring: radeon ring pointer
  77  *
  78  * Get the current wptr from the hardware (cayman+).
  79  */
  80 uint32_t cayman_dma_get_wptr(struct radeon_device *rdev,
  81                            struct radeon_ring *ring)
  82 {
  83         u32 reg;
  84
  85         if (ring->idx == R600_RING_TYPE_DMA_INDEX)
  86                 reg = DMA_RB_WPTR + DMA0_REGISTER_OFFSET;
  87         else
  88                 reg = DMA_RB_WPTR + DMA1_REGISTER_OFFSET;
  89
  90         return (RREG32(reg) & 0x3fffc) >> 2;
  91 }
  92
  93 /**
  94  * cayman_dma_set_wptr - commit the write pointer
  95  *
  96  * @rdev: radeon_device pointer
  97  * @ring: radeon ring pointer
  98  *
  99  * Write the wptr back to the hardware (cayman+).
 100  */
 101 void cayman_dma_set_wptr(struct radeon_device *rdev,
 102                          struct radeon_ring *ring)
 103 {
 104         u32 reg;
 105
 106         if (ring->idx == R600_RING_TYPE_DMA_INDEX)
 107                 reg = DMA_RB_WPTR + DMA0_REGISTER_OFFSET;
 108         else
 109                 reg = DMA_RB_WPTR + DMA1_REGISTER_OFFSET;
 110
 111         WREG32(reg, (ring->wptr << 2) & 0x3fffc);
 112 }
 113
 114 /**
 115  * cayman_dma_ring_ib_execute - Schedule an IB on the DMA engine
 116  *
 117  * @rdev: radeon_device pointer
 118  * @ib: IB object to schedule
 119  *
 120  * Schedule an IB in the DMA ring (cayman-SI).
 121  */
 122 void cayman_dma_ring_ib_execute(struct radeon_device *rdev,
 123                                 struct radeon_ib *ib)
 124 {
 125         struct radeon_ring *ring = &rdev->ring[ib->ring];
 126
 127         if (rdev->wb.enabled) {
 128                 u32 next_rptr = ring->wptr + 4;
 129                 while ((next_rptr & 7) != 5)
 130                         next_rptr++;
 131                 next_rptr += 3;
 132                 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1));
 133                 radeon_ring_write(ring, ring->next_rptr_gpu_addr & 0xfffffffc);
 134                 radeon_ring_write(ring, upper_32_bits(ring->next_rptr_gpu_addr) & 0xff);
 135                 radeon_ring_write(ring, next_rptr);
 136         }
 137
 138         /* The indirect buffer packet must end on an 8 DW boundary in the DMA ring.
 139          * Pad as necessary with NOPs.
 140          */
 141         while ((ring->wptr & 7) != 5)
 142                 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0));
 143         radeon_ring_write(ring, DMA_IB_PACKET(DMA_PACKET_INDIRECT_BUFFER, ib->vm ? ib->vm->id : 0, 0));
 144         radeon_ring_write(ring, (ib->gpu_addr & 0xFFFFFFE0));
 145         radeon_ring_write(ring, (ib->length_dw << 12) | (upper_32_bits(ib->gpu_addr) & 0xFF));
 146
 147 }
 148
 149 /**
 150  * cayman_dma_stop - stop the async dma engines
 151  *
 152  * @rdev: radeon_device pointer
 153  *
 154  * Stop the async dma engines (cayman-SI).
 155  */
 156 void cayman_dma_stop(struct radeon_device *rdev)
 157 {
 158         u32 rb_cntl;
 159
 160         if ((rdev->asic->copy.copy_ring_index == R600_RING_TYPE_DMA_INDEX) ||
 161             (rdev->asic->copy.copy_ring_index == CAYMAN_RING_TYPE_DMA1_INDEX))
 162                 radeon_ttm_set_active_vram_size(rdev, rdev->mc.visible_vram_size);
 163
 164         /* dma0 */
 165         rb_cntl = RREG32(DMA_RB_CNTL + DMA0_REGISTER_OFFSET);
 166         rb_cntl &= ~DMA_RB_ENABLE;
 167         WREG32(DMA_RB_CNTL + DMA0_REGISTER_OFFSET, rb_cntl);
 168
 169         /* dma1 */
 170         rb_cntl = RREG32(DMA_RB_CNTL + DMA1_REGISTER_OFFSET);
 171         rb_cntl &= ~DMA_RB_ENABLE;
 172         WREG32(DMA_RB_CNTL + DMA1_REGISTER_OFFSET, rb_cntl);
 173
 174         rdev->ring[R600_RING_TYPE_DMA_INDEX].ready = false;
 175         rdev->ring[CAYMAN_RING_TYPE_DMA1_INDEX].ready = false;
 176 }
 177
 178 /**
 179  * cayman_dma_resume - setup and start the async dma engines
 180  *
 181  * @rdev: radeon_device pointer
 182  *
 183  * Set up the DMA ring buffers and enable them. (cayman-SI).
 184  * Returns 0 for success, error for failure.
 185  */
 186 int cayman_dma_resume(struct radeon_device *rdev)
 187 {
 188         struct radeon_ring *ring;
 189         u32 rb_cntl, dma_cntl, ib_cntl;
 190         u32 rb_bufsz;
 191         u32 reg_offset, wb_offset;
 192         int i, r;
 193
 194         for (i = 0; i < 2; i++) {
 195                 if (i == 0) {
 196                         ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX];
 197                         reg_offset = DMA0_REGISTER_OFFSET;
 198                         wb_offset = R600_WB_DMA_RPTR_OFFSET;
 199                 } else {
 200                         ring = &rdev->ring[CAYMAN_RING_TYPE_DMA1_INDEX];
 201                         reg_offset = DMA1_REGISTER_OFFSET;
 202                         wb_offset = CAYMAN_WB_DMA1_RPTR_OFFSET;
 203                 }
 204
 205                 WREG32(DMA_SEM_INCOMPLETE_TIMER_CNTL + reg_offset, 0);
 206                 WREG32(DMA_SEM_WAIT_FAIL_TIMER_CNTL + reg_offset, 0);
 207
 208                 /* Set ring buffer size in dwords */
 209                 rb_bufsz = order_base_2(ring->ring_size / 4);
 210                 rb_cntl = rb_bufsz << 1;
 211 #ifdef __BIG_ENDIAN
 212                 rb_cntl |= DMA_RB_SWAP_ENABLE | DMA_RPTR_WRITEBACK_SWAP_ENABLE;
 213 #endif
 214                 WREG32(DMA_RB_CNTL + reg_offset, rb_cntl);
 215
 216                 /* Initialize the ring buffer's read and write pointers */
 217                 WREG32(DMA_RB_RPTR + reg_offset, 0);
 218                 WREG32(DMA_RB_WPTR + reg_offset, 0);
 219
 220                 /* set the wb address whether it's enabled or not */
 221                 WREG32(DMA_RB_RPTR_ADDR_HI + reg_offset,
 222                        upper_32_bits(rdev->wb.gpu_addr + wb_offset) & 0xFF);
 223                 WREG32(DMA_RB_RPTR_ADDR_LO + reg_offset,
 224                        ((rdev->wb.gpu_addr + wb_offset) & 0xFFFFFFFC));
 225
 226                 if (rdev->wb.enabled)
 227                         rb_cntl |= DMA_RPTR_WRITEBACK_ENABLE;
 228
 229                 WREG32(DMA_RB_BASE + reg_offset, ring->gpu_addr >> 8);
 230
 231                 /* enable DMA IBs */
 232                 ib_cntl = DMA_IB_ENABLE | CMD_VMID_FORCE;
 233 #ifdef __BIG_ENDIAN
 234                 ib_cntl |= DMA_IB_SWAP_ENABLE;
 235 #endif
 236                 WREG32(DMA_IB_CNTL + reg_offset, ib_cntl);
 237
 238                 dma_cntl = RREG32(DMA_CNTL + reg_offset);
 239                 dma_cntl &= ~CTXEMPTY_INT_ENABLE;
 240                 WREG32(DMA_CNTL + reg_offset, dma_cntl);
 241
 242                 ring->wptr = 0;
 243                 WREG32(DMA_RB_WPTR + reg_offset, ring->wptr << 2);
 244
 245                 WREG32(DMA_RB_CNTL + reg_offset, rb_cntl | DMA_RB_ENABLE);
 246
 247                 ring->ready = true;
 248
 249                 r = radeon_ring_test(rdev, ring->idx, ring);
 250                 if (r) {
 251                         ring->ready = false;
 252                         return r;
 253                 }
 254         }
 255
 256         if ((rdev->asic->copy.copy_ring_index == R600_RING_TYPE_DMA_INDEX) ||
 257             (rdev->asic->copy.copy_ring_index == CAYMAN_RING_TYPE_DMA1_INDEX))
 258                 radeon_ttm_set_active_vram_size(rdev, rdev->mc.real_vram_size);
 259
 260         return 0;
 261 }
 262
 263 /**
 264  * cayman_dma_fini - tear down the async dma engines
 265  *
 266  * @rdev: radeon_device pointer
 267  *
 268  * Stop the async dma engines and free the rings (cayman-SI).
 269  */
 270 void cayman_dma_fini(struct radeon_device *rdev)
 271 {
 272         cayman_dma_stop(rdev);
 273         radeon_ring_fini(rdev, &rdev->ring[R600_RING_TYPE_DMA_INDEX]);
 274         radeon_ring_fini(rdev, &rdev->ring[CAYMAN_RING_TYPE_DMA1_INDEX]);
 275 }
 276
 277 /**
 278  * cayman_dma_is_lockup - Check if the DMA engine is locked up
 279  *
 280  * @rdev: radeon_device pointer
 281  * @ring: radeon_ring structure holding ring information
 282  *
 283  * Check if the async DMA engine is locked up.
 284  * Returns true if the engine appears to be locked up, false if not.
 285  */
 286 bool cayman_dma_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
 287 {
 288         u32 reset_mask = cayman_gpu_check_soft_reset(rdev);
 289         u32 mask;
 290
 291         if (ring->idx == R600_RING_TYPE_DMA_INDEX)
 292                 mask = RADEON_RESET_DMA;
 293         else
 294                 mask = RADEON_RESET_DMA1;
 295
 296         if (!(reset_mask & mask)) {
 297                 radeon_ring_lockup_update(rdev, ring);
 298                 return false;
 299         }
 300         return radeon_ring_test_lockup(rdev, ring);
 301 }
 302
 303 /**
 304  * cayman_dma_vm_copy_pages - update PTEs by copying them from the GART
 305  *
 306  * @rdev: radeon_device pointer
 307  * @ib: indirect buffer to fill with commands
 308  * @pe: addr of the page entry
 309  * @src: src addr where to copy from
 310  * @count: number of page entries to update
 311  *
 312  * Update PTEs by copying them from the GART using the DMA (cayman/TN).
 313  */
 314 void cayman_dma_vm_copy_pages(struct radeon_device *rdev,
 315                               struct radeon_ib *ib,
 316                               uint64_t pe, uint64_t src,
 317                               unsigned count)
 318 {
 319         unsigned ndw;
 320
 321         while (count) {
 322                 ndw = count * 2;
 323                 if (ndw > 0xFFFFE)
 324                         ndw = 0xFFFFE;
 325
 326                 ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_COPY,
 327                                                       0, 0, ndw);
 328                 ib->ptr[ib->length_dw++] = lower_32_bits(pe);
 329                 ib->ptr[ib->length_dw++] = lower_32_bits(src);
 330                 ib->ptr[ib->length_dw++] = upper_32_bits(pe) & 0xff;
 331                 ib->ptr[ib->length_dw++] = upper_32_bits(src) & 0xff;
 332
 333                 pe += ndw * 4;
 334                 src += ndw * 4;
 335                 count -= ndw / 2;
 336         }
 337 }
 338
 339 /**
 340  * cayman_dma_vm_write_pages - update PTEs by writing them manually
 341  *
 342  * @rdev: radeon_device pointer
 343  * @ib: indirect buffer to fill with commands
 344  * @pe: addr of the page entry
 345  * @addr: dst addr to write into pe
 346  * @count: number of page entries to update
 347  * @incr: increase next addr by incr bytes
 348  * @flags: hw access flags
 349  *
 350  * Update PTEs by writing them manually using the DMA (cayman/TN).
 351  */
 352 void cayman_dma_vm_write_pages(struct radeon_device *rdev,
 353                                struct radeon_ib *ib,
 354                                uint64_t pe,
 355                                uint64_t addr, unsigned count,
 356                                uint32_t incr, uint32_t flags)
 357 {
 358         uint64_t value;
 359         unsigned ndw;
 360
 361         while (count) {
 362                 ndw = count * 2;
 363                 if (ndw > 0xFFFFE)
 364                         ndw = 0xFFFFE;
 365
 366                 /* for non-physically contiguous pages (system) */
 367                 ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_WRITE,
 368                                                       0, 0, ndw);
 369                 ib->ptr[ib->length_dw++] = pe;
 370                 ib->ptr[ib->length_dw++] = upper_32_bits(pe) & 0xff;
 371                 for (; ndw > 0; ndw -= 2, --count, pe += 8) {
 372                         if (flags & R600_PTE_SYSTEM) {
 373                                 value = radeon_vm_map_gart(rdev, addr);
 374                                 value &= 0xFFFFFFFFFFFFF000ULL;
 375                         } else if (flags & R600_PTE_VALID) {
 376                                 value = addr;
 377                         } else {
 378                                 value = 0;
 379                         }
 380                         addr += incr;
 381                         value |= flags;
 382                         ib->ptr[ib->length_dw++] = value;
 383                         ib->ptr[ib->length_dw++] = upper_32_bits(value);
 384                 }
 385         }
 386 }
 387
 388 /**
 389  * cayman_dma_vm_set_pages - update the page tables using the DMA
 390  *
 391  * @rdev: radeon_device pointer
 392  * @ib: indirect buffer to fill with commands
 393  * @pe: addr of the page entry
 394  * @addr: dst addr to write into pe
 395  * @count: number of page entries to update
 396  * @incr: increase next addr by incr bytes
 397  * @flags: hw access flags
 398  *
 399  * Update the page tables using the DMA (cayman/TN).
 400  */
 401 void cayman_dma_vm_set_pages(struct radeon_device *rdev,
 402                              struct radeon_ib *ib,
 403                              uint64_t pe,
 404                              uint64_t addr, unsigned count,
 405                              uint32_t incr, uint32_t flags)
 406 {
 407         uint64_t value;
 408         unsigned ndw;
 409
 410         while (count) {
 411                 ndw = count * 2;
 412                 if (ndw > 0xFFFFE)
 413                         ndw = 0xFFFFE;
 414
 415                 if (flags & R600_PTE_VALID)
 416                         value = addr;
 417                 else
 418                         value = 0;
 419
 420                 /* for physically contiguous pages (vram) */
 421                 ib->ptr[ib->length_dw++] = DMA_PTE_PDE_PACKET(ndw);
 422                 ib->ptr[ib->length_dw++] = pe; /* dst addr */
 423                 ib->ptr[ib->length_dw++] = upper_32_bits(pe) & 0xff;
 424                 ib->ptr[ib->length_dw++] = flags; /* mask */
 425                 ib->ptr[ib->length_dw++] = 0;
 426                 ib->ptr[ib->length_dw++] = value; /* value */
 427                 ib->ptr[ib->length_dw++] = upper_32_bits(value);
 428                 ib->ptr[ib->length_dw++] = incr; /* increment size */
 429                 ib->ptr[ib->length_dw++] = 0;
 430
 431                 pe += ndw * 4;
 432                 addr += (ndw / 2) * incr;
 433                 count -= ndw / 2;
 434         }
 435 }
 436
 437 /**
 438  * cayman_dma_vm_pad_ib - pad the IB to the required number of dw
 439  *
 440  * @ib: indirect buffer to fill with padding
 441  *
 442  */
 443 void cayman_dma_vm_pad_ib(struct radeon_ib *ib)
 444 {
 445         while (ib->length_dw & 0x7)
 446                 ib->ptr[ib->length_dw++] = DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0);
 447 }
 448
 449 void cayman_dma_vm_flush(struct radeon_device *rdev, int ridx, struct radeon_vm *vm)
 450 {
 451         struct radeon_ring *ring = &rdev->ring[ridx];
 452
 453         if (vm == NULL)
 454                 return;
 455
 456         radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0));
 457         radeon_ring_write(ring, (0xf << 16) | ((VM_CONTEXT0_PAGE_TABLE_BASE_ADDR + (vm->id << 2)) >> 2));
 458         radeon_ring_write(ring, vm->pd_gpu_addr >> 12);
 459
 460         /* flush hdp cache */
 461         radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0));
 462         radeon_ring_write(ring, (0xf << 16) | (HDP_MEM_COHERENCY_FLUSH_CNTL >> 2));
 463         radeon_ring_write(ring, 1);
 464
 465         /* bits 0-7 are the VM contexts0-7 */
 466         radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SRBM_WRITE, 0, 0, 0));
 467         radeon_ring_write(ring, (0xf << 16) | (VM_INVALIDATE_REQUEST >> 2));
 468         radeon_ring_write(ring, 1 << vm->id);
 469 }