1 /* 2 * Copyright 2013 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 25 #include "radeon.h" 26 #include "radeon_asic.h" 27 #include "r600.h" 28 #include "r600d.h" 29 30 /* 31 * DMA 32 * Starting with R600, the GPU has an asynchronous 33 * DMA engine. The programming model is very similar 34 * to the 3D engine (ring buffer, IBs, etc.), but the 35 * DMA controller has it's own packet format that is 36 * different form the PM4 format used by the 3D engine. 37 * It supports copying data, writing embedded data, 38 * solid fills, and a number of other things. It also 39 * has support for tiling/detiling of buffers. 40 */ 41 42 /** 43 * r600_dma_get_rptr - get the current read pointer 44 * 45 * @rdev: radeon_device pointer 46 * @ring: radeon ring pointer 47 * 48 * Get the current rptr from the hardware (r6xx+). 49 */ 50 uint32_t r600_dma_get_rptr(struct radeon_device *rdev, 51 struct radeon_ring *ring) 52 { 53 u32 rptr; 54 55 if (rdev->wb.enabled) 56 rptr = rdev->wb.wb[ring->rptr_offs/4]; 57 else 58 rptr = RREG32(DMA_RB_RPTR); 59 60 return (rptr & 0x3fffc) >> 2; 61 } 62 63 /** 64 * r600_dma_get_wptr - get the current write pointer 65 * 66 * @rdev: radeon_device pointer 67 * @ring: radeon ring pointer 68 * 69 * Get the current wptr from the hardware (r6xx+). 70 */ 71 uint32_t r600_dma_get_wptr(struct radeon_device *rdev, 72 struct radeon_ring *ring) 73 { 74 return (RREG32(DMA_RB_WPTR) & 0x3fffc) >> 2; 75 } 76 77 /** 78 * r600_dma_set_wptr - commit the write pointer 79 * 80 * @rdev: radeon_device pointer 81 * @ring: radeon ring pointer 82 * 83 * Write the wptr back to the hardware (r6xx+). 84 */ 85 void r600_dma_set_wptr(struct radeon_device *rdev, 86 struct radeon_ring *ring) 87 { 88 WREG32(DMA_RB_WPTR, (ring->wptr << 2) & 0x3fffc); 89 } 90 91 /** 92 * r600_dma_stop - stop the async dma engine 93 * 94 * @rdev: radeon_device pointer 95 * 96 * Stop the async dma engine (r6xx-evergreen). 97 */ 98 void r600_dma_stop(struct radeon_device *rdev) 99 { 100 u32 rb_cntl = RREG32(DMA_RB_CNTL); 101 102 if (rdev->asic->copy.copy_ring_index == R600_RING_TYPE_DMA_INDEX) 103 radeon_ttm_set_active_vram_size(rdev, rdev->mc.visible_vram_size); 104 105 rb_cntl &= ~DMA_RB_ENABLE; 106 WREG32(DMA_RB_CNTL, rb_cntl); 107 108 rdev->ring[R600_RING_TYPE_DMA_INDEX].ready = false; 109 } 110 111 /** 112 * r600_dma_resume - setup and start the async dma engine 113 * 114 * @rdev: radeon_device pointer 115 * 116 * Set up the DMA ring buffer and enable it. (r6xx-evergreen). 117 * Returns 0 for success, error for failure. 118 */ 119 int r600_dma_resume(struct radeon_device *rdev) 120 { 121 struct radeon_ring *ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX]; 122 u32 rb_cntl, dma_cntl, ib_cntl; 123 u32 rb_bufsz; 124 int r; 125 126 WREG32(DMA_SEM_INCOMPLETE_TIMER_CNTL, 0); 127 WREG32(DMA_SEM_WAIT_FAIL_TIMER_CNTL, 0); 128 129 /* Set ring buffer size in dwords */ 130 rb_bufsz = order_base_2(ring->ring_size / 4); 131 rb_cntl = rb_bufsz << 1; 132 #ifdef __BIG_ENDIAN 133 rb_cntl |= DMA_RB_SWAP_ENABLE | DMA_RPTR_WRITEBACK_SWAP_ENABLE; 134 #endif 135 WREG32(DMA_RB_CNTL, rb_cntl); 136 137 /* Initialize the ring buffer's read and write pointers */ 138 WREG32(DMA_RB_RPTR, 0); 139 WREG32(DMA_RB_WPTR, 0); 140 141 /* set the wb address whether it's enabled or not */ 142 WREG32(DMA_RB_RPTR_ADDR_HI, 143 upper_32_bits(rdev->wb.gpu_addr + R600_WB_DMA_RPTR_OFFSET) & 0xFF); 144 WREG32(DMA_RB_RPTR_ADDR_LO, 145 ((rdev->wb.gpu_addr + R600_WB_DMA_RPTR_OFFSET) & 0xFFFFFFFC)); 146 147 if (rdev->wb.enabled) 148 rb_cntl |= DMA_RPTR_WRITEBACK_ENABLE; 149 150 WREG32(DMA_RB_BASE, ring->gpu_addr >> 8); 151 152 /* enable DMA IBs */ 153 ib_cntl = DMA_IB_ENABLE; 154 #ifdef __BIG_ENDIAN 155 ib_cntl |= DMA_IB_SWAP_ENABLE; 156 #endif 157 WREG32(DMA_IB_CNTL, ib_cntl); 158 159 dma_cntl = RREG32(DMA_CNTL); 160 dma_cntl &= ~CTXEMPTY_INT_ENABLE; 161 WREG32(DMA_CNTL, dma_cntl); 162 163 if (rdev->family >= CHIP_RV770) 164 WREG32(DMA_MODE, 1); 165 166 ring->wptr = 0; 167 WREG32(DMA_RB_WPTR, ring->wptr << 2); 168 169 WREG32(DMA_RB_CNTL, rb_cntl | DMA_RB_ENABLE); 170 171 ring->ready = true; 172 173 r = radeon_ring_test(rdev, R600_RING_TYPE_DMA_INDEX, ring); 174 if (r) { 175 ring->ready = false; 176 return r; 177 } 178 179 if (rdev->asic->copy.copy_ring_index == R600_RING_TYPE_DMA_INDEX) 180 radeon_ttm_set_active_vram_size(rdev, rdev->mc.real_vram_size); 181 182 return 0; 183 } 184 185 /** 186 * r600_dma_fini - tear down the async dma engine 187 * 188 * @rdev: radeon_device pointer 189 * 190 * Stop the async dma engine and free the ring (r6xx-evergreen). 191 */ 192 void r600_dma_fini(struct radeon_device *rdev) 193 { 194 r600_dma_stop(rdev); 195 radeon_ring_fini(rdev, &rdev->ring[R600_RING_TYPE_DMA_INDEX]); 196 } 197 198 /** 199 * r600_dma_is_lockup - Check if the DMA engine is locked up 200 * 201 * @rdev: radeon_device pointer 202 * @ring: radeon_ring structure holding ring information 203 * 204 * Check if the async DMA engine is locked up. 205 * Returns true if the engine appears to be locked up, false if not. 206 */ 207 bool r600_dma_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring) 208 { 209 u32 reset_mask = r600_gpu_check_soft_reset(rdev); 210 211 if (!(reset_mask & RADEON_RESET_DMA)) { 212 radeon_ring_lockup_update(rdev, ring); 213 return false; 214 } 215 return radeon_ring_test_lockup(rdev, ring); 216 } 217 218 219 /** 220 * r600_dma_ring_test - simple async dma engine test 221 * 222 * @rdev: radeon_device pointer 223 * @ring: radeon_ring structure holding ring information 224 * 225 * Test the DMA engine by writing using it to write an 226 * value to memory. (r6xx-SI). 227 * Returns 0 for success, error for failure. 228 */ 229 int r600_dma_ring_test(struct radeon_device *rdev, 230 struct radeon_ring *ring) 231 { 232 unsigned i; 233 int r; 234 unsigned index; 235 u32 tmp; 236 u64 gpu_addr; 237 238 if (ring->idx == R600_RING_TYPE_DMA_INDEX) 239 index = R600_WB_DMA_RING_TEST_OFFSET; 240 else 241 index = CAYMAN_WB_DMA1_RING_TEST_OFFSET; 242 243 gpu_addr = rdev->wb.gpu_addr + index; 244 245 tmp = 0xCAFEDEAD; 246 rdev->wb.wb[index/4] = cpu_to_le32(tmp); 247 248 r = radeon_ring_lock(rdev, ring, 4); 249 if (r) { 250 DRM_ERROR("radeon: dma failed to lock ring %d (%d).\n", ring->idx, r); 251 return r; 252 } 253 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1)); 254 radeon_ring_write(ring, lower_32_bits(gpu_addr)); 255 radeon_ring_write(ring, upper_32_bits(gpu_addr) & 0xff); 256 radeon_ring_write(ring, 0xDEADBEEF); 257 radeon_ring_unlock_commit(rdev, ring, false); 258 259 for (i = 0; i < rdev->usec_timeout; i++) { 260 tmp = le32_to_cpu(rdev->wb.wb[index/4]); 261 if (tmp == 0xDEADBEEF) 262 break; 263 udelay(1); 264 } 265 266 if (i < rdev->usec_timeout) { 267 DRM_INFO("ring test on %d succeeded in %d usecs\n", ring->idx, i); 268 } else { 269 DRM_ERROR("radeon: ring %d test failed (0x%08X)\n", 270 ring->idx, tmp); 271 r = -EINVAL; 272 } 273 return r; 274 } 275 276 /** 277 * r600_dma_fence_ring_emit - emit a fence on the DMA ring 278 * 279 * @rdev: radeon_device pointer 280 * @fence: radeon fence object 281 * 282 * Add a DMA fence packet to the ring to write 283 * the fence seq number and DMA trap packet to generate 284 * an interrupt if needed (r6xx-r7xx). 285 */ 286 void r600_dma_fence_ring_emit(struct radeon_device *rdev, 287 struct radeon_fence *fence) 288 { 289 struct radeon_ring *ring = &rdev->ring[fence->ring]; 290 u64 addr = rdev->fence_drv[fence->ring].gpu_addr; 291 292 /* write the fence */ 293 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_FENCE, 0, 0, 0)); 294 radeon_ring_write(ring, addr & 0xfffffffc); 295 radeon_ring_write(ring, (upper_32_bits(addr) & 0xff)); 296 radeon_ring_write(ring, lower_32_bits(fence->seq)); 297 /* generate an interrupt */ 298 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_TRAP, 0, 0, 0)); 299 } 300 301 /** 302 * r600_dma_semaphore_ring_emit - emit a semaphore on the dma ring 303 * 304 * @rdev: radeon_device pointer 305 * @ring: radeon_ring structure holding ring information 306 * @semaphore: radeon semaphore object 307 * @emit_wait: wait or signal semaphore 308 * 309 * Add a DMA semaphore packet to the ring wait on or signal 310 * other rings (r6xx-SI). 311 */ 312 bool r600_dma_semaphore_ring_emit(struct radeon_device *rdev, 313 struct radeon_ring *ring, 314 struct radeon_semaphore *semaphore, 315 bool emit_wait) 316 { 317 u64 addr = semaphore->gpu_addr; 318 u32 s = emit_wait ? 0 : 1; 319 320 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SEMAPHORE, 0, s, 0)); 321 radeon_ring_write(ring, addr & 0xfffffffc); 322 radeon_ring_write(ring, upper_32_bits(addr) & 0xff); 323 324 return true; 325 } 326 327 /** 328 * r600_dma_ib_test - test an IB on the DMA engine 329 * 330 * @rdev: radeon_device pointer 331 * @ring: radeon_ring structure holding ring information 332 * 333 * Test a simple IB in the DMA ring (r6xx-SI). 334 * Returns 0 on success, error on failure. 335 */ 336 int r600_dma_ib_test(struct radeon_device *rdev, struct radeon_ring *ring) 337 { 338 struct radeon_ib ib; 339 unsigned i; 340 unsigned index; 341 int r; 342 u32 tmp = 0; 343 u64 gpu_addr; 344 345 if (ring->idx == R600_RING_TYPE_DMA_INDEX) 346 index = R600_WB_DMA_RING_TEST_OFFSET; 347 else 348 index = CAYMAN_WB_DMA1_RING_TEST_OFFSET; 349 350 gpu_addr = rdev->wb.gpu_addr + index; 351 352 r = radeon_ib_get(rdev, ring->idx, &ib, NULL, 256); 353 if (r) { 354 DRM_ERROR("radeon: failed to get ib (%d).\n", r); 355 return r; 356 } 357 358 ib.ptr[0] = DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1); 359 ib.ptr[1] = lower_32_bits(gpu_addr); 360 ib.ptr[2] = upper_32_bits(gpu_addr) & 0xff; 361 ib.ptr[3] = 0xDEADBEEF; 362 ib.length_dw = 4; 363 364 r = radeon_ib_schedule(rdev, &ib, NULL, false); 365 if (r) { 366 radeon_ib_free(rdev, &ib); 367 DRM_ERROR("radeon: failed to schedule ib (%d).\n", r); 368 return r; 369 } 370 r = radeon_fence_wait_timeout(ib.fence, false, usecs_to_jiffies( 371 RADEON_USEC_IB_TEST_TIMEOUT)); 372 if (r < 0) { 373 DRM_ERROR("radeon: fence wait failed (%d).\n", r); 374 return r; 375 } else if (r == 0) { 376 DRM_ERROR("radeon: fence wait timed out.\n"); 377 return -ETIMEDOUT; 378 } 379 r = 0; 380 for (i = 0; i < rdev->usec_timeout; i++) { 381 tmp = le32_to_cpu(rdev->wb.wb[index/4]); 382 if (tmp == 0xDEADBEEF) 383 break; 384 udelay(1); 385 } 386 if (i < rdev->usec_timeout) { 387 DRM_INFO("ib test on ring %d succeeded in %u usecs\n", ib.fence->ring, i); 388 } else { 389 DRM_ERROR("radeon: ib test failed (0x%08X)\n", tmp); 390 r = -EINVAL; 391 } 392 radeon_ib_free(rdev, &ib); 393 return r; 394 } 395 396 /** 397 * r600_dma_ring_ib_execute - Schedule an IB on the DMA engine 398 * 399 * @rdev: radeon_device pointer 400 * @ib: IB object to schedule 401 * 402 * Schedule an IB in the DMA ring (r6xx-r7xx). 403 */ 404 void r600_dma_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib) 405 { 406 struct radeon_ring *ring = &rdev->ring[ib->ring]; 407 408 if (rdev->wb.enabled) { 409 u32 next_rptr = ring->wptr + 4; 410 while ((next_rptr & 7) != 5) 411 next_rptr++; 412 next_rptr += 3; 413 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1)); 414 radeon_ring_write(ring, ring->next_rptr_gpu_addr & 0xfffffffc); 415 radeon_ring_write(ring, upper_32_bits(ring->next_rptr_gpu_addr) & 0xff); 416 radeon_ring_write(ring, next_rptr); 417 } 418 419 /* The indirect buffer packet must end on an 8 DW boundary in the DMA ring. 420 * Pad as necessary with NOPs. 421 */ 422 while ((ring->wptr & 7) != 5) 423 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0)); 424 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_INDIRECT_BUFFER, 0, 0, 0)); 425 radeon_ring_write(ring, (ib->gpu_addr & 0xFFFFFFE0)); 426 radeon_ring_write(ring, (ib->length_dw << 16) | (upper_32_bits(ib->gpu_addr) & 0xFF)); 427 428 } 429 430 /** 431 * r600_copy_dma - copy pages using the DMA engine 432 * 433 * @rdev: radeon_device pointer 434 * @src_offset: src GPU address 435 * @dst_offset: dst GPU address 436 * @num_gpu_pages: number of GPU pages to xfer 437 * @resv: reservation object to sync to 438 * 439 * Copy GPU paging using the DMA engine (r6xx). 440 * Used by the radeon ttm implementation to move pages if 441 * registered as the asic copy callback. 442 */ 443 struct radeon_fence *r600_copy_dma(struct radeon_device *rdev, 444 uint64_t src_offset, uint64_t dst_offset, 445 unsigned num_gpu_pages, 446 struct dma_resv *resv) 447 { 448 struct radeon_fence *fence; 449 struct radeon_sync sync; 450 int ring_index = rdev->asic->copy.dma_ring_index; 451 struct radeon_ring *ring = &rdev->ring[ring_index]; 452 u32 size_in_dw, cur_size_in_dw; 453 int i, num_loops; 454 int r = 0; 455 456 radeon_sync_create(&sync); 457 458 size_in_dw = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT) / 4; 459 num_loops = DIV_ROUND_UP(size_in_dw, 0xFFFE); 460 r = radeon_ring_lock(rdev, ring, num_loops * 4 + 8); 461 if (r) { 462 DRM_ERROR("radeon: moving bo (%d).\n", r); 463 radeon_sync_free(rdev, &sync, NULL); 464 return ERR_PTR(r); 465 } 466 467 radeon_sync_resv(rdev, &sync, resv, false); 468 radeon_sync_rings(rdev, &sync, ring->idx); 469 470 for (i = 0; i < num_loops; i++) { 471 cur_size_in_dw = size_in_dw; 472 if (cur_size_in_dw > 0xFFFE) 473 cur_size_in_dw = 0xFFFE; 474 size_in_dw -= cur_size_in_dw; 475 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw)); 476 radeon_ring_write(ring, dst_offset & 0xfffffffc); 477 radeon_ring_write(ring, src_offset & 0xfffffffc); 478 radeon_ring_write(ring, (((upper_32_bits(dst_offset) & 0xff) << 16) | 479 (upper_32_bits(src_offset) & 0xff))); 480 src_offset += cur_size_in_dw * 4; 481 dst_offset += cur_size_in_dw * 4; 482 } 483 484 r = radeon_fence_emit(rdev, &fence, ring->idx); 485 if (r) { 486 radeon_ring_unlock_undo(rdev, ring); 487 radeon_sync_free(rdev, &sync, NULL); 488 return ERR_PTR(r); 489 } 490 491 radeon_ring_unlock_commit(rdev, ring, false); 492 radeon_sync_free(rdev, &sync, fence); 493 494 return fence; 495 } 496