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 #include <drm/drmP.h> 25 #include "radeon.h" 26 #include "radeon_asic.h" 27 #include "r600d.h" 28 29 u32 r600_gpu_check_soft_reset(struct radeon_device *rdev); 30 31 /* 32 * DMA 33 * Starting with R600, the GPU has an asynchronous 34 * DMA engine. The programming model is very similar 35 * to the 3D engine (ring buffer, IBs, etc.), but the 36 * DMA controller has it's own packet format that is 37 * different form the PM4 format used by the 3D engine. 38 * It supports copying data, writing embedded data, 39 * solid fills, and a number of other things. It also 40 * has support for tiling/detiling of buffers. 41 */ 42 43 /** 44 * r600_dma_get_rptr - get the current read pointer 45 * 46 * @rdev: radeon_device pointer 47 * @ring: radeon ring pointer 48 * 49 * Get the current rptr from the hardware (r6xx+). 50 */ 51 uint32_t r600_dma_get_rptr(struct radeon_device *rdev, 52 struct radeon_ring *ring) 53 { 54 u32 rptr; 55 56 if (rdev->wb.enabled) 57 rptr = rdev->wb.wb[ring->rptr_offs/4]; 58 else 59 rptr = RREG32(DMA_RB_RPTR); 60 61 return (rptr & 0x3fffc) >> 2; 62 } 63 64 /** 65 * r600_dma_get_wptr - get the current write pointer 66 * 67 * @rdev: radeon_device pointer 68 * @ring: radeon ring pointer 69 * 70 * Get the current wptr from the hardware (r6xx+). 71 */ 72 uint32_t r600_dma_get_wptr(struct radeon_device *rdev, 73 struct radeon_ring *ring) 74 { 75 return (RREG32(DMA_RB_WPTR) & 0x3fffc) >> 2; 76 } 77 78 /** 79 * r600_dma_set_wptr - commit the write pointer 80 * 81 * @rdev: radeon_device pointer 82 * @ring: radeon ring pointer 83 * 84 * Write the wptr back to the hardware (r6xx+). 85 */ 86 void r600_dma_set_wptr(struct radeon_device *rdev, 87 struct radeon_ring *ring) 88 { 89 WREG32(DMA_RB_WPTR, (ring->wptr << 2) & 0x3fffc); 90 } 91 92 /** 93 * r600_dma_stop - stop the async dma engine 94 * 95 * @rdev: radeon_device pointer 96 * 97 * Stop the async dma engine (r6xx-evergreen). 98 */ 99 void r600_dma_stop(struct radeon_device *rdev) 100 { 101 u32 rb_cntl = RREG32(DMA_RB_CNTL); 102 103 if (rdev->asic->copy.copy_ring_index == R600_RING_TYPE_DMA_INDEX) 104 radeon_ttm_set_active_vram_size(rdev, rdev->mc.visible_vram_size); 105 106 rb_cntl &= ~DMA_RB_ENABLE; 107 WREG32(DMA_RB_CNTL, rb_cntl); 108 109 rdev->ring[R600_RING_TYPE_DMA_INDEX].ready = false; 110 } 111 112 /** 113 * r600_dma_resume - setup and start the async dma engine 114 * 115 * @rdev: radeon_device pointer 116 * 117 * Set up the DMA ring buffer and enable it. (r6xx-evergreen). 118 * Returns 0 for success, error for failure. 119 */ 120 int r600_dma_resume(struct radeon_device *rdev) 121 { 122 struct radeon_ring *ring = &rdev->ring[R600_RING_TYPE_DMA_INDEX]; 123 u32 rb_cntl, dma_cntl, ib_cntl; 124 u32 rb_bufsz; 125 int r; 126 127 WREG32(DMA_SEM_INCOMPLETE_TIMER_CNTL, 0); 128 WREG32(DMA_SEM_WAIT_FAIL_TIMER_CNTL, 0); 129 130 /* Set ring buffer size in dwords */ 131 rb_bufsz = order_base_2(ring->ring_size / 4); 132 rb_cntl = rb_bufsz << 1; 133 #ifdef __BIG_ENDIAN 134 rb_cntl |= DMA_RB_SWAP_ENABLE | DMA_RPTR_WRITEBACK_SWAP_ENABLE; 135 #endif 136 WREG32(DMA_RB_CNTL, rb_cntl); 137 138 /* Initialize the ring buffer's read and write pointers */ 139 WREG32(DMA_RB_RPTR, 0); 140 WREG32(DMA_RB_WPTR, 0); 141 142 /* set the wb address whether it's enabled or not */ 143 WREG32(DMA_RB_RPTR_ADDR_HI, 144 upper_32_bits(rdev->wb.gpu_addr + R600_WB_DMA_RPTR_OFFSET) & 0xFF); 145 WREG32(DMA_RB_RPTR_ADDR_LO, 146 ((rdev->wb.gpu_addr + R600_WB_DMA_RPTR_OFFSET) & 0xFFFFFFFC)); 147 148 if (rdev->wb.enabled) 149 rb_cntl |= DMA_RPTR_WRITEBACK_ENABLE; 150 151 WREG32(DMA_RB_BASE, ring->gpu_addr >> 8); 152 153 /* enable DMA IBs */ 154 ib_cntl = DMA_IB_ENABLE; 155 #ifdef __BIG_ENDIAN 156 ib_cntl |= DMA_IB_SWAP_ENABLE; 157 #endif 158 WREG32(DMA_IB_CNTL, ib_cntl); 159 160 dma_cntl = RREG32(DMA_CNTL); 161 dma_cntl &= ~CTXEMPTY_INT_ENABLE; 162 WREG32(DMA_CNTL, dma_cntl); 163 164 if (rdev->family >= CHIP_RV770) 165 WREG32(DMA_MODE, 1); 166 167 ring->wptr = 0; 168 WREG32(DMA_RB_WPTR, ring->wptr << 2); 169 170 WREG32(DMA_RB_CNTL, rb_cntl | DMA_RB_ENABLE); 171 172 ring->ready = true; 173 174 r = radeon_ring_test(rdev, R600_RING_TYPE_DMA_INDEX, ring); 175 if (r) { 176 ring->ready = false; 177 return r; 178 } 179 180 if (rdev->asic->copy.copy_ring_index == R600_RING_TYPE_DMA_INDEX) 181 radeon_ttm_set_active_vram_size(rdev, rdev->mc.real_vram_size); 182 183 return 0; 184 } 185 186 /** 187 * r600_dma_fini - tear down the async dma engine 188 * 189 * @rdev: radeon_device pointer 190 * 191 * Stop the async dma engine and free the ring (r6xx-evergreen). 192 */ 193 void r600_dma_fini(struct radeon_device *rdev) 194 { 195 r600_dma_stop(rdev); 196 radeon_ring_fini(rdev, &rdev->ring[R600_RING_TYPE_DMA_INDEX]); 197 } 198 199 /** 200 * r600_dma_is_lockup - Check if the DMA engine is locked up 201 * 202 * @rdev: radeon_device pointer 203 * @ring: radeon_ring structure holding ring information 204 * 205 * Check if the async DMA engine is locked up. 206 * Returns true if the engine appears to be locked up, false if not. 207 */ 208 bool r600_dma_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring) 209 { 210 u32 reset_mask = r600_gpu_check_soft_reset(rdev); 211 212 if (!(reset_mask & RADEON_RESET_DMA)) { 213 radeon_ring_lockup_update(rdev, ring); 214 return false; 215 } 216 return radeon_ring_test_lockup(rdev, ring); 217 } 218 219 220 /** 221 * r600_dma_ring_test - simple async dma engine test 222 * 223 * @rdev: radeon_device pointer 224 * @ring: radeon_ring structure holding ring information 225 * 226 * Test the DMA engine by writing using it to write an 227 * value to memory. (r6xx-SI). 228 * Returns 0 for success, error for failure. 229 */ 230 int r600_dma_ring_test(struct radeon_device *rdev, 231 struct radeon_ring *ring) 232 { 233 unsigned i; 234 int r; 235 unsigned index; 236 u32 tmp; 237 u64 gpu_addr; 238 239 if (ring->idx == R600_RING_TYPE_DMA_INDEX) 240 index = R600_WB_DMA_RING_TEST_OFFSET; 241 else 242 index = CAYMAN_WB_DMA1_RING_TEST_OFFSET; 243 244 gpu_addr = rdev->wb.gpu_addr + index; 245 246 tmp = 0xCAFEDEAD; 247 rdev->wb.wb[index/4] = cpu_to_le32(tmp); 248 249 r = radeon_ring_lock(rdev, ring, 4); 250 if (r) { 251 DRM_ERROR("radeon: dma failed to lock ring %d (%d).\n", ring->idx, r); 252 return r; 253 } 254 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1)); 255 radeon_ring_write(ring, lower_32_bits(gpu_addr)); 256 radeon_ring_write(ring, upper_32_bits(gpu_addr) & 0xff); 257 radeon_ring_write(ring, 0xDEADBEEF); 258 radeon_ring_unlock_commit(rdev, ring, false); 259 260 for (i = 0; i < rdev->usec_timeout; i++) { 261 tmp = le32_to_cpu(rdev->wb.wb[index/4]); 262 if (tmp == 0xDEADBEEF) 263 break; 264 DRM_UDELAY(1); 265 } 266 267 if (i < rdev->usec_timeout) { 268 DRM_INFO("ring test on %d succeeded in %d usecs\n", ring->idx, i); 269 } else { 270 DRM_ERROR("radeon: ring %d test failed (0x%08X)\n", 271 ring->idx, tmp); 272 r = -EINVAL; 273 } 274 return r; 275 } 276 277 /** 278 * r600_dma_fence_ring_emit - emit a fence on the DMA ring 279 * 280 * @rdev: radeon_device pointer 281 * @fence: radeon fence object 282 * 283 * Add a DMA fence packet to the ring to write 284 * the fence seq number and DMA trap packet to generate 285 * an interrupt if needed (r6xx-r7xx). 286 */ 287 void r600_dma_fence_ring_emit(struct radeon_device *rdev, 288 struct radeon_fence *fence) 289 { 290 struct radeon_ring *ring = &rdev->ring[fence->ring]; 291 u64 addr = rdev->fence_drv[fence->ring].gpu_addr; 292 293 /* write the fence */ 294 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_FENCE, 0, 0, 0)); 295 radeon_ring_write(ring, addr & 0xfffffffc); 296 radeon_ring_write(ring, (upper_32_bits(addr) & 0xff)); 297 radeon_ring_write(ring, lower_32_bits(fence->seq)); 298 /* generate an interrupt */ 299 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_TRAP, 0, 0, 0)); 300 } 301 302 /** 303 * r600_dma_semaphore_ring_emit - emit a semaphore on the dma ring 304 * 305 * @rdev: radeon_device pointer 306 * @ring: radeon_ring structure holding ring information 307 * @semaphore: radeon semaphore object 308 * @emit_wait: wait or signal semaphore 309 * 310 * Add a DMA semaphore packet to the ring wait on or signal 311 * other rings (r6xx-SI). 312 */ 313 bool r600_dma_semaphore_ring_emit(struct radeon_device *rdev, 314 struct radeon_ring *ring, 315 struct radeon_semaphore *semaphore, 316 bool emit_wait) 317 { 318 u64 addr = semaphore->gpu_addr; 319 u32 s = emit_wait ? 0 : 1; 320 321 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_SEMAPHORE, 0, s, 0)); 322 radeon_ring_write(ring, addr & 0xfffffffc); 323 radeon_ring_write(ring, upper_32_bits(addr) & 0xff); 324 325 return true; 326 } 327 328 /** 329 * r600_dma_ib_test - test an IB on the DMA engine 330 * 331 * @rdev: radeon_device pointer 332 * @ring: radeon_ring structure holding ring information 333 * 334 * Test a simple IB in the DMA ring (r6xx-SI). 335 * Returns 0 on success, error on failure. 336 */ 337 int r600_dma_ib_test(struct radeon_device *rdev, struct radeon_ring *ring) 338 { 339 struct radeon_ib ib; 340 unsigned i; 341 unsigned index; 342 int r; 343 u32 tmp = 0; 344 u64 gpu_addr; 345 346 if (ring->idx == R600_RING_TYPE_DMA_INDEX) 347 index = R600_WB_DMA_RING_TEST_OFFSET; 348 else 349 index = CAYMAN_WB_DMA1_RING_TEST_OFFSET; 350 351 gpu_addr = rdev->wb.gpu_addr + index; 352 353 r = radeon_ib_get(rdev, ring->idx, &ib, NULL, 256); 354 if (r) { 355 DRM_ERROR("radeon: failed to get ib (%d).\n", r); 356 return r; 357 } 358 359 ib.ptr[0] = DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1); 360 ib.ptr[1] = lower_32_bits(gpu_addr); 361 ib.ptr[2] = upper_32_bits(gpu_addr) & 0xff; 362 ib.ptr[3] = 0xDEADBEEF; 363 ib.length_dw = 4; 364 365 r = radeon_ib_schedule(rdev, &ib, NULL, false); 366 if (r) { 367 radeon_ib_free(rdev, &ib); 368 DRM_ERROR("radeon: failed to schedule ib (%d).\n", r); 369 return r; 370 } 371 r = radeon_fence_wait_timeout(ib.fence, false, usecs_to_jiffies( 372 RADEON_USEC_IB_TEST_TIMEOUT)); 373 if (r < 0) { 374 DRM_ERROR("radeon: fence wait failed (%d).\n", r); 375 return r; 376 } else if (r == 0) { 377 DRM_ERROR("radeon: fence wait timed out.\n"); 378 return -ETIMEDOUT; 379 } 380 r = 0; 381 for (i = 0; i < rdev->usec_timeout; i++) { 382 tmp = le32_to_cpu(rdev->wb.wb[index/4]); 383 if (tmp == 0xDEADBEEF) 384 break; 385 DRM_UDELAY(1); 386 } 387 if (i < rdev->usec_timeout) { 388 DRM_INFO("ib test on ring %d succeeded in %u usecs\n", ib.fence->ring, i); 389 } else { 390 DRM_ERROR("radeon: ib test failed (0x%08X)\n", tmp); 391 r = -EINVAL; 392 } 393 radeon_ib_free(rdev, &ib); 394 return r; 395 } 396 397 /** 398 * r600_dma_ring_ib_execute - Schedule an IB on the DMA engine 399 * 400 * @rdev: radeon_device pointer 401 * @ib: IB object to schedule 402 * 403 * Schedule an IB in the DMA ring (r6xx-r7xx). 404 */ 405 void r600_dma_ring_ib_execute(struct radeon_device *rdev, struct radeon_ib *ib) 406 { 407 struct radeon_ring *ring = &rdev->ring[ib->ring]; 408 409 if (rdev->wb.enabled) { 410 u32 next_rptr = ring->wptr + 4; 411 while ((next_rptr & 7) != 5) 412 next_rptr++; 413 next_rptr += 3; 414 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_WRITE, 0, 0, 1)); 415 radeon_ring_write(ring, ring->next_rptr_gpu_addr & 0xfffffffc); 416 radeon_ring_write(ring, upper_32_bits(ring->next_rptr_gpu_addr) & 0xff); 417 radeon_ring_write(ring, next_rptr); 418 } 419 420 /* The indirect buffer packet must end on an 8 DW boundary in the DMA ring. 421 * Pad as necessary with NOPs. 422 */ 423 while ((ring->wptr & 7) != 5) 424 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_NOP, 0, 0, 0)); 425 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_INDIRECT_BUFFER, 0, 0, 0)); 426 radeon_ring_write(ring, (ib->gpu_addr & 0xFFFFFFE0)); 427 radeon_ring_write(ring, (ib->length_dw << 16) | (upper_32_bits(ib->gpu_addr) & 0xFF)); 428 429 } 430 431 /** 432 * r600_copy_dma - copy pages using the DMA engine 433 * 434 * @rdev: radeon_device pointer 435 * @src_offset: src GPU address 436 * @dst_offset: dst GPU address 437 * @num_gpu_pages: number of GPU pages to xfer 438 * @resv: reservation object to sync to 439 * 440 * Copy GPU paging using the DMA engine (r6xx). 441 * Used by the radeon ttm implementation to move pages if 442 * registered as the asic copy callback. 443 */ 444 struct radeon_fence *r600_copy_dma(struct radeon_device *rdev, 445 uint64_t src_offset, uint64_t dst_offset, 446 unsigned num_gpu_pages, 447 struct reservation_object *resv) 448 { 449 struct radeon_fence *fence; 450 struct radeon_sync sync; 451 int ring_index = rdev->asic->copy.dma_ring_index; 452 struct radeon_ring *ring = &rdev->ring[ring_index]; 453 u32 size_in_dw, cur_size_in_dw; 454 int i, num_loops; 455 int r = 0; 456 457 radeon_sync_create(&sync); 458 459 size_in_dw = (num_gpu_pages << RADEON_GPU_PAGE_SHIFT) / 4; 460 num_loops = DIV_ROUND_UP(size_in_dw, 0xFFFE); 461 r = radeon_ring_lock(rdev, ring, num_loops * 4 + 8); 462 if (r) { 463 DRM_ERROR("radeon: moving bo (%d).\n", r); 464 radeon_sync_free(rdev, &sync, NULL); 465 return ERR_PTR(r); 466 } 467 468 radeon_sync_resv(rdev, &sync, resv, false); 469 radeon_sync_rings(rdev, &sync, ring->idx); 470 471 for (i = 0; i < num_loops; i++) { 472 cur_size_in_dw = size_in_dw; 473 if (cur_size_in_dw > 0xFFFE) 474 cur_size_in_dw = 0xFFFE; 475 size_in_dw -= cur_size_in_dw; 476 radeon_ring_write(ring, DMA_PACKET(DMA_PACKET_COPY, 0, 0, cur_size_in_dw)); 477 radeon_ring_write(ring, dst_offset & 0xfffffffc); 478 radeon_ring_write(ring, src_offset & 0xfffffffc); 479 radeon_ring_write(ring, (((upper_32_bits(dst_offset) & 0xff) << 16) | 480 (upper_32_bits(src_offset) & 0xff))); 481 src_offset += cur_size_in_dw * 4; 482 dst_offset += cur_size_in_dw * 4; 483 } 484 485 r = radeon_fence_emit(rdev, &fence, ring->idx); 486 if (r) { 487 radeon_ring_unlock_undo(rdev, ring); 488 radeon_sync_free(rdev, &sync, NULL); 489 return ERR_PTR(r); 490 } 491 492 radeon_ring_unlock_commit(rdev, ring, false); 493 radeon_sync_free(rdev, &sync, fence); 494 495 return fence; 496 } 497