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 #include "drmP.h" 24 #include "amdgpu.h" 25 #include "amdgpu_ih.h" 26 #include "vid.h" 27 28 #include "oss/oss_3_0_d.h" 29 #include "oss/oss_3_0_sh_mask.h" 30 31 #include "bif/bif_5_1_d.h" 32 #include "bif/bif_5_1_sh_mask.h" 33 34 /* 35 * Interrupts 36 * Starting with r6xx, interrupts are handled via a ring buffer. 37 * Ring buffers are areas of GPU accessible memory that the GPU 38 * writes interrupt vectors into and the host reads vectors out of. 39 * There is a rptr (read pointer) that determines where the 40 * host is currently reading, and a wptr (write pointer) 41 * which determines where the GPU has written. When the 42 * pointers are equal, the ring is idle. When the GPU 43 * writes vectors to the ring buffer, it increments the 44 * wptr. When there is an interrupt, the host then starts 45 * fetching commands and processing them until the pointers are 46 * equal again at which point it updates the rptr. 47 */ 48 49 static void tonga_ih_set_interrupt_funcs(struct amdgpu_device *adev); 50 51 /** 52 * tonga_ih_enable_interrupts - Enable the interrupt ring buffer 53 * 54 * @adev: amdgpu_device pointer 55 * 56 * Enable the interrupt ring buffer (VI). 57 */ 58 static void tonga_ih_enable_interrupts(struct amdgpu_device *adev) 59 { 60 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL); 61 62 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1); 63 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 1); 64 WREG32(mmIH_RB_CNTL, ih_rb_cntl); 65 adev->irq.ih.enabled = true; 66 } 67 68 /** 69 * tonga_ih_disable_interrupts - Disable the interrupt ring buffer 70 * 71 * @adev: amdgpu_device pointer 72 * 73 * Disable the interrupt ring buffer (VI). 74 */ 75 static void tonga_ih_disable_interrupts(struct amdgpu_device *adev) 76 { 77 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL); 78 79 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0); 80 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 0); 81 WREG32(mmIH_RB_CNTL, ih_rb_cntl); 82 /* set rptr, wptr to 0 */ 83 WREG32(mmIH_RB_RPTR, 0); 84 WREG32(mmIH_RB_WPTR, 0); 85 adev->irq.ih.enabled = false; 86 adev->irq.ih.rptr = 0; 87 } 88 89 /** 90 * tonga_ih_irq_init - init and enable the interrupt ring 91 * 92 * @adev: amdgpu_device pointer 93 * 94 * Allocate a ring buffer for the interrupt controller, 95 * enable the RLC, disable interrupts, enable the IH 96 * ring buffer and enable it (VI). 97 * Called at device load and reume. 98 * Returns 0 for success, errors for failure. 99 */ 100 static int tonga_ih_irq_init(struct amdgpu_device *adev) 101 { 102 int ret = 0; 103 int rb_bufsz; 104 u32 interrupt_cntl, ih_rb_cntl, ih_doorbell_rtpr; 105 u64 wptr_off; 106 107 /* disable irqs */ 108 tonga_ih_disable_interrupts(adev); 109 110 /* setup interrupt control */ 111 WREG32(mmINTERRUPT_CNTL2, adev->dummy_page.addr >> 8); 112 interrupt_cntl = RREG32(mmINTERRUPT_CNTL); 113 /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi 114 * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN 115 */ 116 interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0); 117 /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */ 118 interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0); 119 WREG32(mmINTERRUPT_CNTL, interrupt_cntl); 120 121 /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/ 122 if (adev->irq.ih.use_bus_addr) 123 WREG32(mmIH_RB_BASE, adev->irq.ih.rb_dma_addr >> 8); 124 else 125 WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8); 126 127 rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4); 128 ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); 129 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz); 130 /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */ 131 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1); 132 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_VMID, 0); 133 134 if (adev->irq.msi_enabled) 135 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RPTR_REARM, 1); 136 137 WREG32(mmIH_RB_CNTL, ih_rb_cntl); 138 139 /* set the writeback address whether it's enabled or not */ 140 if (adev->irq.ih.use_bus_addr) 141 wptr_off = adev->irq.ih.rb_dma_addr + (adev->irq.ih.wptr_offs * 4); 142 else 143 wptr_off = adev->wb.gpu_addr + (adev->irq.ih.wptr_offs * 4); 144 WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(wptr_off)); 145 WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(wptr_off) & 0xFF); 146 147 /* set rptr, wptr to 0 */ 148 WREG32(mmIH_RB_RPTR, 0); 149 WREG32(mmIH_RB_WPTR, 0); 150 151 ih_doorbell_rtpr = RREG32(mmIH_DOORBELL_RPTR); 152 if (adev->irq.ih.use_doorbell) { 153 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR, 154 OFFSET, adev->irq.ih.doorbell_index); 155 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR, 156 ENABLE, 1); 157 } else { 158 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR, 159 ENABLE, 0); 160 } 161 WREG32(mmIH_DOORBELL_RPTR, ih_doorbell_rtpr); 162 163 pci_set_master(adev->pdev); 164 165 /* enable interrupts */ 166 tonga_ih_enable_interrupts(adev); 167 168 return ret; 169 } 170 171 /** 172 * tonga_ih_irq_disable - disable interrupts 173 * 174 * @adev: amdgpu_device pointer 175 * 176 * Disable interrupts on the hw (VI). 177 */ 178 static void tonga_ih_irq_disable(struct amdgpu_device *adev) 179 { 180 tonga_ih_disable_interrupts(adev); 181 182 /* Wait and acknowledge irq */ 183 mdelay(1); 184 } 185 186 /** 187 * tonga_ih_get_wptr - get the IH ring buffer wptr 188 * 189 * @adev: amdgpu_device pointer 190 * 191 * Get the IH ring buffer wptr from either the register 192 * or the writeback memory buffer (VI). Also check for 193 * ring buffer overflow and deal with it. 194 * Used by cz_irq_process(VI). 195 * Returns the value of the wptr. 196 */ 197 static u32 tonga_ih_get_wptr(struct amdgpu_device *adev) 198 { 199 u32 wptr, tmp; 200 201 if (adev->irq.ih.use_bus_addr) 202 wptr = le32_to_cpu(adev->irq.ih.ring[adev->irq.ih.wptr_offs]); 203 else 204 wptr = le32_to_cpu(adev->wb.wb[adev->irq.ih.wptr_offs]); 205 206 if (REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) { 207 wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0); 208 /* When a ring buffer overflow happen start parsing interrupt 209 * from the last not overwritten vector (wptr + 16). Hopefully 210 * this should allow us to catchup. 211 */ 212 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n", 213 wptr, adev->irq.ih.rptr, (wptr + 16) & adev->irq.ih.ptr_mask); 214 adev->irq.ih.rptr = (wptr + 16) & adev->irq.ih.ptr_mask; 215 tmp = RREG32(mmIH_RB_CNTL); 216 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); 217 WREG32(mmIH_RB_CNTL, tmp); 218 } 219 return (wptr & adev->irq.ih.ptr_mask); 220 } 221 222 /** 223 * tonga_ih_decode_iv - decode an interrupt vector 224 * 225 * @adev: amdgpu_device pointer 226 * 227 * Decodes the interrupt vector at the current rptr 228 * position and also advance the position. 229 */ 230 static void tonga_ih_decode_iv(struct amdgpu_device *adev, 231 struct amdgpu_iv_entry *entry) 232 { 233 /* wptr/rptr are in bytes! */ 234 u32 ring_index = adev->irq.ih.rptr >> 2; 235 uint32_t dw[4]; 236 237 dw[0] = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]); 238 dw[1] = le32_to_cpu(adev->irq.ih.ring[ring_index + 1]); 239 dw[2] = le32_to_cpu(adev->irq.ih.ring[ring_index + 2]); 240 dw[3] = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]); 241 242 entry->src_id = dw[0] & 0xff; 243 entry->src_data = dw[1] & 0xfffffff; 244 entry->ring_id = dw[2] & 0xff; 245 entry->vm_id = (dw[2] >> 8) & 0xff; 246 entry->pas_id = (dw[2] >> 16) & 0xffff; 247 248 /* wptr/rptr are in bytes! */ 249 adev->irq.ih.rptr += 16; 250 } 251 252 /** 253 * tonga_ih_set_rptr - set the IH ring buffer rptr 254 * 255 * @adev: amdgpu_device pointer 256 * 257 * Set the IH ring buffer rptr. 258 */ 259 static void tonga_ih_set_rptr(struct amdgpu_device *adev) 260 { 261 if (adev->irq.ih.use_doorbell) { 262 /* XXX check if swapping is necessary on BE */ 263 if (adev->irq.ih.use_bus_addr) 264 adev->irq.ih.ring[adev->irq.ih.rptr_offs] = adev->irq.ih.rptr; 265 else 266 adev->wb.wb[adev->irq.ih.rptr_offs] = adev->irq.ih.rptr; 267 WDOORBELL32(adev->irq.ih.doorbell_index, adev->irq.ih.rptr); 268 } else { 269 WREG32(mmIH_RB_RPTR, adev->irq.ih.rptr); 270 } 271 } 272 273 static int tonga_ih_early_init(void *handle) 274 { 275 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 276 277 tonga_ih_set_interrupt_funcs(adev); 278 return 0; 279 } 280 281 static int tonga_ih_sw_init(void *handle) 282 { 283 int r; 284 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 285 286 r = amdgpu_ih_ring_init(adev, 4 * 1024, true); 287 if (r) 288 return r; 289 290 adev->irq.ih.use_doorbell = true; 291 adev->irq.ih.doorbell_index = AMDGPU_DOORBELL_IH; 292 293 r = amdgpu_irq_init(adev); 294 295 return r; 296 } 297 298 static int tonga_ih_sw_fini(void *handle) 299 { 300 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 301 302 amdgpu_irq_fini(adev); 303 amdgpu_ih_ring_fini(adev); 304 305 return 0; 306 } 307 308 static int tonga_ih_hw_init(void *handle) 309 { 310 int r; 311 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 312 313 r = tonga_ih_irq_init(adev); 314 if (r) 315 return r; 316 317 return 0; 318 } 319 320 static int tonga_ih_hw_fini(void *handle) 321 { 322 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 323 324 tonga_ih_irq_disable(adev); 325 326 return 0; 327 } 328 329 static int tonga_ih_suspend(void *handle) 330 { 331 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 332 333 return tonga_ih_hw_fini(adev); 334 } 335 336 static int tonga_ih_resume(void *handle) 337 { 338 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 339 340 return tonga_ih_hw_init(adev); 341 } 342 343 static bool tonga_ih_is_idle(void *handle) 344 { 345 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 346 u32 tmp = RREG32(mmSRBM_STATUS); 347 348 if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY)) 349 return false; 350 351 return true; 352 } 353 354 static int tonga_ih_wait_for_idle(void *handle) 355 { 356 unsigned i; 357 u32 tmp; 358 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 359 360 for (i = 0; i < adev->usec_timeout; i++) { 361 /* read MC_STATUS */ 362 tmp = RREG32(mmSRBM_STATUS); 363 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY)) 364 return 0; 365 udelay(1); 366 } 367 return -ETIMEDOUT; 368 } 369 370 static void tonga_ih_print_status(void *handle) 371 { 372 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 373 374 dev_info(adev->dev, "TONGA IH registers\n"); 375 dev_info(adev->dev, " SRBM_STATUS=0x%08X\n", 376 RREG32(mmSRBM_STATUS)); 377 dev_info(adev->dev, " SRBM_STATUS2=0x%08X\n", 378 RREG32(mmSRBM_STATUS2)); 379 dev_info(adev->dev, " INTERRUPT_CNTL=0x%08X\n", 380 RREG32(mmINTERRUPT_CNTL)); 381 dev_info(adev->dev, " INTERRUPT_CNTL2=0x%08X\n", 382 RREG32(mmINTERRUPT_CNTL2)); 383 dev_info(adev->dev, " IH_CNTL=0x%08X\n", 384 RREG32(mmIH_CNTL)); 385 dev_info(adev->dev, " IH_RB_CNTL=0x%08X\n", 386 RREG32(mmIH_RB_CNTL)); 387 dev_info(adev->dev, " IH_RB_BASE=0x%08X\n", 388 RREG32(mmIH_RB_BASE)); 389 dev_info(adev->dev, " IH_RB_WPTR_ADDR_LO=0x%08X\n", 390 RREG32(mmIH_RB_WPTR_ADDR_LO)); 391 dev_info(adev->dev, " IH_RB_WPTR_ADDR_HI=0x%08X\n", 392 RREG32(mmIH_RB_WPTR_ADDR_HI)); 393 dev_info(adev->dev, " IH_RB_RPTR=0x%08X\n", 394 RREG32(mmIH_RB_RPTR)); 395 dev_info(adev->dev, " IH_RB_WPTR=0x%08X\n", 396 RREG32(mmIH_RB_WPTR)); 397 } 398 399 static int tonga_ih_soft_reset(void *handle) 400 { 401 u32 srbm_soft_reset = 0; 402 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 403 u32 tmp = RREG32(mmSRBM_STATUS); 404 405 if (tmp & SRBM_STATUS__IH_BUSY_MASK) 406 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET, 407 SOFT_RESET_IH, 1); 408 409 if (srbm_soft_reset) { 410 tonga_ih_print_status(adev); 411 412 tmp = RREG32(mmSRBM_SOFT_RESET); 413 tmp |= srbm_soft_reset; 414 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp); 415 WREG32(mmSRBM_SOFT_RESET, tmp); 416 tmp = RREG32(mmSRBM_SOFT_RESET); 417 418 udelay(50); 419 420 tmp &= ~srbm_soft_reset; 421 WREG32(mmSRBM_SOFT_RESET, tmp); 422 tmp = RREG32(mmSRBM_SOFT_RESET); 423 424 /* Wait a little for things to settle down */ 425 udelay(50); 426 427 tonga_ih_print_status(adev); 428 } 429 430 return 0; 431 } 432 433 static int tonga_ih_set_clockgating_state(void *handle, 434 enum amd_clockgating_state state) 435 { 436 return 0; 437 } 438 439 static int tonga_ih_set_powergating_state(void *handle, 440 enum amd_powergating_state state) 441 { 442 return 0; 443 } 444 445 const struct amd_ip_funcs tonga_ih_ip_funcs = { 446 .early_init = tonga_ih_early_init, 447 .late_init = NULL, 448 .sw_init = tonga_ih_sw_init, 449 .sw_fini = tonga_ih_sw_fini, 450 .hw_init = tonga_ih_hw_init, 451 .hw_fini = tonga_ih_hw_fini, 452 .suspend = tonga_ih_suspend, 453 .resume = tonga_ih_resume, 454 .is_idle = tonga_ih_is_idle, 455 .wait_for_idle = tonga_ih_wait_for_idle, 456 .soft_reset = tonga_ih_soft_reset, 457 .print_status = tonga_ih_print_status, 458 .set_clockgating_state = tonga_ih_set_clockgating_state, 459 .set_powergating_state = tonga_ih_set_powergating_state, 460 }; 461 462 static const struct amdgpu_ih_funcs tonga_ih_funcs = { 463 .get_wptr = tonga_ih_get_wptr, 464 .decode_iv = tonga_ih_decode_iv, 465 .set_rptr = tonga_ih_set_rptr 466 }; 467 468 static void tonga_ih_set_interrupt_funcs(struct amdgpu_device *adev) 469 { 470 if (adev->irq.ih_funcs == NULL) 471 adev->irq.ih_funcs = &tonga_ih_funcs; 472 } 473 474