1 /* 2 * Copyright 2016 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 <drm/drmP.h> 24 #include "amdgpu.h" 25 #include "amdgpu_ih.h" 26 #include "soc15.h" 27 28 #include "oss/osssys_4_0_offset.h" 29 #include "oss/osssys_4_0_sh_mask.h" 30 31 #include "soc15_common.h" 32 #include "vega10_ih.h" 33 34 35 36 static void vega10_ih_set_interrupt_funcs(struct amdgpu_device *adev); 37 38 /** 39 * vega10_ih_enable_interrupts - Enable the interrupt ring buffer 40 * 41 * @adev: amdgpu_device pointer 42 * 43 * Enable the interrupt ring buffer (VEGA10). 44 */ 45 static void vega10_ih_enable_interrupts(struct amdgpu_device *adev) 46 { 47 u32 ih_rb_cntl = RREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL); 48 49 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1); 50 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 1); 51 WREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL, ih_rb_cntl); 52 adev->irq.ih.enabled = true; 53 } 54 55 /** 56 * vega10_ih_disable_interrupts - Disable the interrupt ring buffer 57 * 58 * @adev: amdgpu_device pointer 59 * 60 * Disable the interrupt ring buffer (VEGA10). 61 */ 62 static void vega10_ih_disable_interrupts(struct amdgpu_device *adev) 63 { 64 u32 ih_rb_cntl = RREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL); 65 66 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0); 67 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, ENABLE_INTR, 0); 68 WREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL, ih_rb_cntl); 69 /* set rptr, wptr to 0 */ 70 WREG32_SOC15(OSSSYS, 0, mmIH_RB_RPTR, 0); 71 WREG32_SOC15(OSSSYS, 0, mmIH_RB_WPTR, 0); 72 adev->irq.ih.enabled = false; 73 adev->irq.ih.rptr = 0; 74 } 75 76 /** 77 * vega10_ih_irq_init - init and enable the interrupt ring 78 * 79 * @adev: amdgpu_device pointer 80 * 81 * Allocate a ring buffer for the interrupt controller, 82 * enable the RLC, disable interrupts, enable the IH 83 * ring buffer and enable it (VI). 84 * Called at device load and reume. 85 * Returns 0 for success, errors for failure. 86 */ 87 static int vega10_ih_irq_init(struct amdgpu_device *adev) 88 { 89 int ret = 0; 90 int rb_bufsz; 91 u32 ih_rb_cntl, ih_doorbell_rtpr; 92 u32 tmp; 93 u64 wptr_off; 94 95 /* disable irqs */ 96 vega10_ih_disable_interrupts(adev); 97 98 adev->nbio_funcs->ih_control(adev); 99 100 ih_rb_cntl = RREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL); 101 /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/ 102 if (adev->irq.ih.use_bus_addr) { 103 WREG32_SOC15(OSSSYS, 0, mmIH_RB_BASE, adev->irq.ih.rb_dma_addr >> 8); 104 WREG32_SOC15(OSSSYS, 0, mmIH_RB_BASE_HI, ((u64)adev->irq.ih.rb_dma_addr >> 40) & 0xff); 105 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_SPACE, 1); 106 } else { 107 WREG32_SOC15(OSSSYS, 0, mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8); 108 WREG32_SOC15(OSSSYS, 0, mmIH_RB_BASE_HI, (adev->irq.ih.gpu_addr >> 40) & 0xff); 109 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_SPACE, 4); 110 } 111 rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4); 112 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); 113 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_OVERFLOW_ENABLE, 1); 114 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz); 115 /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */ 116 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1); 117 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_SNOOP, 1); 118 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_RO, 0); 119 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_VMID, 0); 120 121 if (adev->irq.msi_enabled) 122 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RPTR_REARM, 1); 123 124 WREG32_SOC15(OSSSYS, 0, mmIH_RB_CNTL, ih_rb_cntl); 125 126 /* set the writeback address whether it's enabled or not */ 127 if (adev->irq.ih.use_bus_addr) 128 wptr_off = adev->irq.ih.rb_dma_addr + (adev->irq.ih.wptr_offs * 4); 129 else 130 wptr_off = adev->wb.gpu_addr + (adev->irq.ih.wptr_offs * 4); 131 WREG32_SOC15(OSSSYS, 0, mmIH_RB_WPTR_ADDR_LO, lower_32_bits(wptr_off)); 132 WREG32_SOC15(OSSSYS, 0, mmIH_RB_WPTR_ADDR_HI, upper_32_bits(wptr_off) & 0xFFFF); 133 134 /* set rptr, wptr to 0 */ 135 WREG32_SOC15(OSSSYS, 0, mmIH_RB_RPTR, 0); 136 WREG32_SOC15(OSSSYS, 0, mmIH_RB_WPTR, 0); 137 138 ih_doorbell_rtpr = RREG32_SOC15(OSSSYS, 0, mmIH_DOORBELL_RPTR); 139 if (adev->irq.ih.use_doorbell) { 140 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR, 141 OFFSET, adev->irq.ih.doorbell_index); 142 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR, 143 ENABLE, 1); 144 } else { 145 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR, 146 ENABLE, 0); 147 } 148 WREG32_SOC15(OSSSYS, 0, mmIH_DOORBELL_RPTR, ih_doorbell_rtpr); 149 adev->nbio_funcs->ih_doorbell_range(adev, adev->irq.ih.use_doorbell, 150 adev->irq.ih.doorbell_index); 151 152 tmp = RREG32_SOC15(OSSSYS, 0, mmIH_STORM_CLIENT_LIST_CNTL); 153 tmp = REG_SET_FIELD(tmp, IH_STORM_CLIENT_LIST_CNTL, 154 CLIENT18_IS_STORM_CLIENT, 1); 155 WREG32_SOC15(OSSSYS, 0, mmIH_STORM_CLIENT_LIST_CNTL, tmp); 156 157 tmp = RREG32_SOC15(OSSSYS, 0, mmIH_INT_FLOOD_CNTL); 158 tmp = REG_SET_FIELD(tmp, IH_INT_FLOOD_CNTL, FLOOD_CNTL_ENABLE, 1); 159 WREG32_SOC15(OSSSYS, 0, mmIH_INT_FLOOD_CNTL, tmp); 160 161 pci_set_master(adev->pdev); 162 163 /* enable interrupts */ 164 vega10_ih_enable_interrupts(adev); 165 166 return ret; 167 } 168 169 /** 170 * vega10_ih_irq_disable - disable interrupts 171 * 172 * @adev: amdgpu_device pointer 173 * 174 * Disable interrupts on the hw (VEGA10). 175 */ 176 static void vega10_ih_irq_disable(struct amdgpu_device *adev) 177 { 178 vega10_ih_disable_interrupts(adev); 179 180 /* Wait and acknowledge irq */ 181 mdelay(1); 182 } 183 184 /** 185 * vega10_ih_get_wptr - get the IH ring buffer wptr 186 * 187 * @adev: amdgpu_device pointer 188 * 189 * Get the IH ring buffer wptr from either the register 190 * or the writeback memory buffer (VEGA10). Also check for 191 * ring buffer overflow and deal with it. 192 * Returns the value of the wptr. 193 */ 194 static u32 vega10_ih_get_wptr(struct amdgpu_device *adev) 195 { 196 u32 wptr, tmp; 197 198 if (adev->irq.ih.use_bus_addr) 199 wptr = le32_to_cpu(adev->irq.ih.ring[adev->irq.ih.wptr_offs]); 200 else 201 wptr = le32_to_cpu(adev->wb.wb[adev->irq.ih.wptr_offs]); 202 203 if (REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) { 204 wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0); 205 206 /* When a ring buffer overflow happen start parsing interrupt 207 * from the last not overwritten vector (wptr + 32). Hopefully 208 * this should allow us to catchup. 209 */ 210 tmp = (wptr + 32) & adev->irq.ih.ptr_mask; 211 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n", 212 wptr, adev->irq.ih.rptr, tmp); 213 adev->irq.ih.rptr = tmp; 214 215 tmp = RREG32_NO_KIQ(SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_CNTL)); 216 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); 217 WREG32_NO_KIQ(SOC15_REG_OFFSET(OSSSYS, 0, mmIH_RB_CNTL), tmp); 218 } 219 return (wptr & adev->irq.ih.ptr_mask); 220 } 221 222 /** 223 * vega10_ih_prescreen_iv - prescreen an interrupt vector 224 * 225 * @adev: amdgpu_device pointer 226 * 227 * Returns true if the interrupt vector should be further processed. 228 */ 229 static bool vega10_ih_prescreen_iv(struct amdgpu_device *adev) 230 { 231 u32 ring_index = adev->irq.ih.rptr >> 2; 232 u32 dw0, dw3, dw4, dw5; 233 u16 pasid; 234 u64 addr, key; 235 struct amdgpu_vm *vm; 236 int r; 237 238 dw0 = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]); 239 dw3 = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]); 240 dw4 = le32_to_cpu(adev->irq.ih.ring[ring_index + 4]); 241 dw5 = le32_to_cpu(adev->irq.ih.ring[ring_index + 5]); 242 243 /* Filter retry page faults, let only the first one pass. If 244 * there are too many outstanding faults, ignore them until 245 * some faults get cleared. 246 */ 247 switch (dw0 & 0xff) { 248 case SOC15_IH_CLIENTID_VMC: 249 case SOC15_IH_CLIENTID_UTCL2: 250 break; 251 default: 252 /* Not a VM fault */ 253 return true; 254 } 255 256 pasid = dw3 & 0xffff; 257 /* No PASID, can't identify faulting process */ 258 if (!pasid) 259 return true; 260 261 /* Not a retry fault, check fault credit */ 262 if (!(dw5 & 0x80)) { 263 if (!amdgpu_vm_pasid_fault_credit(adev, pasid)) 264 goto ignore_iv; 265 return true; 266 } 267 268 addr = ((u64)(dw5 & 0xf) << 44) | ((u64)dw4 << 12); 269 key = AMDGPU_VM_FAULT(pasid, addr); 270 r = amdgpu_ih_add_fault(adev, key); 271 272 /* Hash table is full or the fault is already being processed, 273 * ignore further page faults 274 */ 275 if (r != 0) 276 goto ignore_iv; 277 278 /* Track retry faults in per-VM fault FIFO. */ 279 lockmgr(&adev->vm_manager.pasid_lock, LK_EXCLUSIVE); 280 vm = idr_find(&adev->vm_manager.pasid_idr, pasid); 281 if (!vm) { 282 /* VM not found, process it normally */ 283 lockmgr(&adev->vm_manager.pasid_lock, LK_RELEASE); 284 amdgpu_ih_clear_fault(adev, key); 285 return true; 286 } 287 #if 0 288 /* No locking required with single writer and single reader */ 289 r = kfifo_put(&vm->faults, key); 290 if (!r) { 291 /* FIFO is full. Ignore it until there is space */ 292 amdgpu_ih_clear_fault(adev, key); 293 goto ignore_iv; 294 } 295 #else 296 kprintf("vega10_ih.c: kfifo_put(&vm->faults, key); is not implemented\n"); 297 lockmgr(&adev->vm_manager.pasid_lock, LK_RELEASE); 298 goto ignore_iv; 299 #endif 300 lockmgr(&adev->vm_manager.pasid_lock, LK_RELEASE); 301 302 /* It's the first fault for this address, process it normally */ 303 return true; 304 305 ignore_iv: 306 adev->irq.ih.rptr += 32; 307 return false; 308 } 309 310 /** 311 * vega10_ih_decode_iv - decode an interrupt vector 312 * 313 * @adev: amdgpu_device pointer 314 * 315 * Decodes the interrupt vector at the current rptr 316 * position and also advance the position. 317 */ 318 static void vega10_ih_decode_iv(struct amdgpu_device *adev, 319 struct amdgpu_iv_entry *entry) 320 { 321 /* wptr/rptr are in bytes! */ 322 u32 ring_index = adev->irq.ih.rptr >> 2; 323 uint32_t dw[8]; 324 325 dw[0] = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]); 326 dw[1] = le32_to_cpu(adev->irq.ih.ring[ring_index + 1]); 327 dw[2] = le32_to_cpu(adev->irq.ih.ring[ring_index + 2]); 328 dw[3] = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]); 329 dw[4] = le32_to_cpu(adev->irq.ih.ring[ring_index + 4]); 330 dw[5] = le32_to_cpu(adev->irq.ih.ring[ring_index + 5]); 331 dw[6] = le32_to_cpu(adev->irq.ih.ring[ring_index + 6]); 332 dw[7] = le32_to_cpu(adev->irq.ih.ring[ring_index + 7]); 333 334 entry->client_id = dw[0] & 0xff; 335 entry->src_id = (dw[0] >> 8) & 0xff; 336 entry->ring_id = (dw[0] >> 16) & 0xff; 337 entry->vmid = (dw[0] >> 24) & 0xf; 338 entry->vmid_src = (dw[0] >> 31); 339 entry->timestamp = dw[1] | ((u64)(dw[2] & 0xffff) << 32); 340 entry->timestamp_src = dw[2] >> 31; 341 entry->pasid = dw[3] & 0xffff; 342 entry->pasid_src = dw[3] >> 31; 343 entry->src_data[0] = dw[4]; 344 entry->src_data[1] = dw[5]; 345 entry->src_data[2] = dw[6]; 346 entry->src_data[3] = dw[7]; 347 348 349 /* wptr/rptr are in bytes! */ 350 adev->irq.ih.rptr += 32; 351 } 352 353 /** 354 * vega10_ih_set_rptr - set the IH ring buffer rptr 355 * 356 * @adev: amdgpu_device pointer 357 * 358 * Set the IH ring buffer rptr. 359 */ 360 static void vega10_ih_set_rptr(struct amdgpu_device *adev) 361 { 362 if (adev->irq.ih.use_doorbell) { 363 /* XXX check if swapping is necessary on BE */ 364 if (adev->irq.ih.use_bus_addr) 365 adev->irq.ih.ring[adev->irq.ih.rptr_offs] = adev->irq.ih.rptr; 366 else 367 adev->wb.wb[adev->irq.ih.rptr_offs] = adev->irq.ih.rptr; 368 WDOORBELL32(adev->irq.ih.doorbell_index, adev->irq.ih.rptr); 369 } else { 370 WREG32_SOC15(OSSSYS, 0, mmIH_RB_RPTR, adev->irq.ih.rptr); 371 } 372 } 373 374 static int vega10_ih_early_init(void *handle) 375 { 376 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 377 378 vega10_ih_set_interrupt_funcs(adev); 379 return 0; 380 } 381 382 static int vega10_ih_sw_init(void *handle) 383 { 384 int r; 385 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 386 387 r = amdgpu_ih_ring_init(adev, 256 * 1024, true); 388 if (r) 389 return r; 390 391 adev->irq.ih.use_doorbell = true; 392 adev->irq.ih.doorbell_index = AMDGPU_DOORBELL64_IH << 1; 393 394 adev->irq.ih.faults = kmalloc(sizeof(*adev->irq.ih.faults), M_DRM, GFP_KERNEL); 395 if (!adev->irq.ih.faults) 396 return -ENOMEM; 397 INIT_CHASH_TABLE(adev->irq.ih.faults->hash, 398 AMDGPU_PAGEFAULT_HASH_BITS, 8, 0); 399 lockinit(&adev->irq.ih.faults->lock, "agdiihfl", 0, LK_CANRECURSE); 400 adev->irq.ih.faults->count = 0; 401 402 r = amdgpu_irq_init(adev); 403 404 return r; 405 } 406 407 static int vega10_ih_sw_fini(void *handle) 408 { 409 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 410 411 amdgpu_irq_fini(adev); 412 amdgpu_ih_ring_fini(adev); 413 414 kfree(adev->irq.ih.faults); 415 adev->irq.ih.faults = NULL; 416 417 return 0; 418 } 419 420 static int vega10_ih_hw_init(void *handle) 421 { 422 int r; 423 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 424 425 r = vega10_ih_irq_init(adev); 426 if (r) 427 return r; 428 429 return 0; 430 } 431 432 static int vega10_ih_hw_fini(void *handle) 433 { 434 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 435 436 vega10_ih_irq_disable(adev); 437 438 return 0; 439 } 440 441 static int vega10_ih_suspend(void *handle) 442 { 443 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 444 445 return vega10_ih_hw_fini(adev); 446 } 447 448 static int vega10_ih_resume(void *handle) 449 { 450 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 451 452 return vega10_ih_hw_init(adev); 453 } 454 455 static bool vega10_ih_is_idle(void *handle) 456 { 457 /* todo */ 458 return true; 459 } 460 461 static int vega10_ih_wait_for_idle(void *handle) 462 { 463 /* todo */ 464 return -ETIMEDOUT; 465 } 466 467 static int vega10_ih_soft_reset(void *handle) 468 { 469 /* todo */ 470 471 return 0; 472 } 473 474 static int vega10_ih_set_clockgating_state(void *handle, 475 enum amd_clockgating_state state) 476 { 477 return 0; 478 } 479 480 static int vega10_ih_set_powergating_state(void *handle, 481 enum amd_powergating_state state) 482 { 483 return 0; 484 } 485 486 const struct amd_ip_funcs vega10_ih_ip_funcs = { 487 .name = "vega10_ih", 488 .early_init = vega10_ih_early_init, 489 .late_init = NULL, 490 .sw_init = vega10_ih_sw_init, 491 .sw_fini = vega10_ih_sw_fini, 492 .hw_init = vega10_ih_hw_init, 493 .hw_fini = vega10_ih_hw_fini, 494 .suspend = vega10_ih_suspend, 495 .resume = vega10_ih_resume, 496 .is_idle = vega10_ih_is_idle, 497 .wait_for_idle = vega10_ih_wait_for_idle, 498 .soft_reset = vega10_ih_soft_reset, 499 .set_clockgating_state = vega10_ih_set_clockgating_state, 500 .set_powergating_state = vega10_ih_set_powergating_state, 501 }; 502 503 static const struct amdgpu_ih_funcs vega10_ih_funcs = { 504 .get_wptr = vega10_ih_get_wptr, 505 .prescreen_iv = vega10_ih_prescreen_iv, 506 .decode_iv = vega10_ih_decode_iv, 507 .set_rptr = vega10_ih_set_rptr 508 }; 509 510 static void vega10_ih_set_interrupt_funcs(struct amdgpu_device *adev) 511 { 512 if (adev->irq.ih_funcs == NULL) 513 adev->irq.ih_funcs = &vega10_ih_funcs; 514 } 515 516 const struct amdgpu_ip_block_version vega10_ih_ip_block = 517 { 518 .type = AMD_IP_BLOCK_TYPE_IH, 519 .major = 4, 520 .minor = 0, 521 .rev = 0, 522 .funcs = &vega10_ih_ip_funcs, 523 }; 524