drivers/gpu/drm/amd/amdgpu/tonga_ih.c

   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 <drm/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         u32 interrupt_cntl, ih_rb_cntl, ih_doorbell_rtpr;
 103         struct amdgpu_ih_ring *ih = &adev->irq.ih;
 104         int rb_bufsz;
 105
 106         /* disable irqs */
 107         tonga_ih_disable_interrupts(adev);
 108
 109         /* setup interrupt control */
 110         WREG32(mmINTERRUPT_CNTL2, adev->dummy_page_addr >> 8);
 111         interrupt_cntl = RREG32(mmINTERRUPT_CNTL);
 112         /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
 113          * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN
 114          */
 115         interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0);
 116         /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
 117         interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0);
 118         WREG32(mmINTERRUPT_CNTL, interrupt_cntl);
 119
 120         /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
 121         WREG32(mmIH_RB_BASE, ih->gpu_addr >> 8);
 122
 123         rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4);
 124         ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
 125         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz);
 126         /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */
 127         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1);
 128         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, MC_VMID, 0);
 129
 130         if (adev->irq.msi_enabled)
 131                 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RPTR_REARM, 1);
 132
 133         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
 134
 135         /* set the writeback address whether it's enabled or not */
 136         WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr));
 137         WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 0xFF);
 138
 139         /* set rptr, wptr to 0 */
 140         WREG32(mmIH_RB_RPTR, 0);
 141         WREG32(mmIH_RB_WPTR, 0);
 142
 143         ih_doorbell_rtpr = RREG32(mmIH_DOORBELL_RPTR);
 144         if (adev->irq.ih.use_doorbell) {
 145                 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
 146                                                  OFFSET, adev->irq.ih.doorbell_index);
 147                 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
 148                                                  ENABLE, 1);
 149         } else {
 150                 ih_doorbell_rtpr = REG_SET_FIELD(ih_doorbell_rtpr, IH_DOORBELL_RPTR,
 151                                                  ENABLE, 0);
 152         }
 153         WREG32(mmIH_DOORBELL_RPTR, ih_doorbell_rtpr);
 154
 155         pci_set_master(adev->pdev);
 156
 157         /* enable interrupts */
 158         tonga_ih_enable_interrupts(adev);
 159
 160         return 0;
 161 }
 162
 163 /**
 164  * tonga_ih_irq_disable - disable interrupts
 165  *
 166  * @adev: amdgpu_device pointer
 167  *
 168  * Disable interrupts on the hw (VI).
 169  */
 170 static void tonga_ih_irq_disable(struct amdgpu_device *adev)
 171 {
 172         tonga_ih_disable_interrupts(adev);
 173
 174         /* Wait and acknowledge irq */
 175         mdelay(1);
 176 }
 177
 178 /**
 179  * tonga_ih_get_wptr - get the IH ring buffer wptr
 180  *
 181  * @adev: amdgpu_device pointer
 182  *
 183  * Get the IH ring buffer wptr from either the register
 184  * or the writeback memory buffer (VI).  Also check for
 185  * ring buffer overflow and deal with it.
 186  * Used by cz_irq_process(VI).
 187  * Returns the value of the wptr.
 188  */
 189 static u32 tonga_ih_get_wptr(struct amdgpu_device *adev,
 190                              struct amdgpu_ih_ring *ih)
 191 {
 192         u32 wptr, tmp;
 193
 194         wptr = le32_to_cpu(*ih->wptr_cpu);
 195
 196         if (REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) {
 197                 wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0);
 198                 /* When a ring buffer overflow happen start parsing interrupt
 199                  * from the last not overwritten vector (wptr + 16). Hopefully
 200                  * this should allow us to catchup.
 201                  */
 202                 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
 203                          wptr, ih->rptr, (wptr + 16) & ih->ptr_mask);
 204                 ih->rptr = (wptr + 16) & ih->ptr_mask;
 205                 tmp = RREG32(mmIH_RB_CNTL);
 206                 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
 207                 WREG32(mmIH_RB_CNTL, tmp);
 208         }
 209         return (wptr & ih->ptr_mask);
 210 }
 211
 212 /**
 213  * tonga_ih_decode_iv - decode an interrupt vector
 214  *
 215  * @adev: amdgpu_device pointer
 216  *
 217  * Decodes the interrupt vector at the current rptr
 218  * position and also advance the position.
 219  */
 220 static void tonga_ih_decode_iv(struct amdgpu_device *adev,
 221                                struct amdgpu_ih_ring *ih,
 222                                struct amdgpu_iv_entry *entry)
 223 {
 224         /* wptr/rptr are in bytes! */
 225         u32 ring_index = ih->rptr >> 2;
 226         uint32_t dw[4];
 227
 228         dw[0] = le32_to_cpu(ih->ring[ring_index + 0]);
 229         dw[1] = le32_to_cpu(ih->ring[ring_index + 1]);
 230         dw[2] = le32_to_cpu(ih->ring[ring_index + 2]);
 231         dw[3] = le32_to_cpu(ih->ring[ring_index + 3]);
 232
 233         entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY;
 234         entry->src_id = dw[0] & 0xff;
 235         entry->src_data[0] = dw[1] & 0xfffffff;
 236         entry->ring_id = dw[2] & 0xff;
 237         entry->vmid = (dw[2] >> 8) & 0xff;
 238         entry->pasid = (dw[2] >> 16) & 0xffff;
 239
 240         /* wptr/rptr are in bytes! */
 241         ih->rptr += 16;
 242 }
 243
 244 /**
 245  * tonga_ih_set_rptr - set the IH ring buffer rptr
 246  *
 247  * @adev: amdgpu_device pointer
 248  *
 249  * Set the IH ring buffer rptr.
 250  */
 251 static void tonga_ih_set_rptr(struct amdgpu_device *adev,
 252                               struct amdgpu_ih_ring *ih)
 253 {
 254         if (ih->use_doorbell) {
 255                 /* XXX check if swapping is necessary on BE */
 256                 *ih->rptr_cpu = ih->rptr;
 257                 WDOORBELL32(ih->doorbell_index, ih->rptr);
 258         } else {
 259                 WREG32(mmIH_RB_RPTR, ih->rptr);
 260         }
 261 }
 262
 263 static int tonga_ih_early_init(void *handle)
 264 {
 265         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 266         int ret;
 267
 268         ret = amdgpu_irq_add_domain(adev);
 269         if (ret)
 270                 return ret;
 271
 272         tonga_ih_set_interrupt_funcs(adev);
 273
 274         return 0;
 275 }
 276
 277 static int tonga_ih_sw_init(void *handle)
 278 {
 279         int r;
 280         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 281
 282         r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, true);
 283         if (r)
 284                 return r;
 285
 286         adev->irq.ih.use_doorbell = true;
 287         adev->irq.ih.doorbell_index = adev->doorbell_index.ih;
 288
 289         r = amdgpu_irq_init(adev);
 290
 291         return r;
 292 }
 293
 294 static int tonga_ih_sw_fini(void *handle)
 295 {
 296         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 297
 298         amdgpu_irq_fini(adev);
 299         amdgpu_ih_ring_fini(adev, &adev->irq.ih);
 300         amdgpu_irq_remove_domain(adev);
 301
 302         return 0;
 303 }
 304
 305 static int tonga_ih_hw_init(void *handle)
 306 {
 307         int r;
 308         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 309
 310         r = tonga_ih_irq_init(adev);
 311         if (r)
 312                 return r;
 313
 314         return 0;
 315 }
 316
 317 static int tonga_ih_hw_fini(void *handle)
 318 {
 319         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 320
 321         tonga_ih_irq_disable(adev);
 322
 323         return 0;
 324 }
 325
 326 static int tonga_ih_suspend(void *handle)
 327 {
 328         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 329
 330         return tonga_ih_hw_fini(adev);
 331 }
 332
 333 static int tonga_ih_resume(void *handle)
 334 {
 335         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 336
 337         return tonga_ih_hw_init(adev);
 338 }
 339
 340 static bool tonga_ih_is_idle(void *handle)
 341 {
 342         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 343         u32 tmp = RREG32(mmSRBM_STATUS);
 344
 345         if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
 346                 return false;
 347
 348         return true;
 349 }
 350
 351 static int tonga_ih_wait_for_idle(void *handle)
 352 {
 353         unsigned i;
 354         u32 tmp;
 355         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 356
 357         for (i = 0; i < adev->usec_timeout; i++) {
 358                 /* read MC_STATUS */
 359                 tmp = RREG32(mmSRBM_STATUS);
 360                 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
 361                         return 0;
 362                 udelay(1);
 363         }
 364         return -ETIMEDOUT;
 365 }
 366
 367 static bool tonga_ih_check_soft_reset(void *handle)
 368 {
 369         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 370         u32 srbm_soft_reset = 0;
 371         u32 tmp = RREG32(mmSRBM_STATUS);
 372
 373         if (tmp & SRBM_STATUS__IH_BUSY_MASK)
 374                 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
 375                                                 SOFT_RESET_IH, 1);
 376
 377         if (srbm_soft_reset) {
 378                 adev->irq.srbm_soft_reset = srbm_soft_reset;
 379                 return true;
 380         } else {
 381                 adev->irq.srbm_soft_reset = 0;
 382                 return false;
 383         }
 384 }
 385
 386 static int tonga_ih_pre_soft_reset(void *handle)
 387 {
 388         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 389
 390         if (!adev->irq.srbm_soft_reset)
 391                 return 0;
 392
 393         return tonga_ih_hw_fini(adev);
 394 }
 395
 396 static int tonga_ih_post_soft_reset(void *handle)
 397 {
 398         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 399
 400         if (!adev->irq.srbm_soft_reset)
 401                 return 0;
 402
 403         return tonga_ih_hw_init(adev);
 404 }
 405
 406 static int tonga_ih_soft_reset(void *handle)
 407 {
 408         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 409         u32 srbm_soft_reset;
 410
 411         if (!adev->irq.srbm_soft_reset)
 412                 return 0;
 413         srbm_soft_reset = adev->irq.srbm_soft_reset;
 414
 415         if (srbm_soft_reset) {
 416                 u32 tmp;
 417
 418                 tmp = RREG32(mmSRBM_SOFT_RESET);
 419                 tmp |= srbm_soft_reset;
 420                 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
 421                 WREG32(mmSRBM_SOFT_RESET, tmp);
 422                 tmp = RREG32(mmSRBM_SOFT_RESET);
 423
 424                 udelay(50);
 425
 426                 tmp &= ~srbm_soft_reset;
 427                 WREG32(mmSRBM_SOFT_RESET, tmp);
 428                 tmp = RREG32(mmSRBM_SOFT_RESET);
 429
 430                 /* Wait a little for things to settle down */
 431                 udelay(50);
 432         }
 433
 434         return 0;
 435 }
 436
 437 static int tonga_ih_set_clockgating_state(void *handle,
 438                                           enum amd_clockgating_state state)
 439 {
 440         return 0;
 441 }
 442
 443 static int tonga_ih_set_powergating_state(void *handle,
 444                                           enum amd_powergating_state state)
 445 {
 446         return 0;
 447 }
 448
 449 static const struct amd_ip_funcs tonga_ih_ip_funcs = {
 450         .name = "tonga_ih",
 451         .early_init = tonga_ih_early_init,
 452         .late_init = NULL,
 453         .sw_init = tonga_ih_sw_init,
 454         .sw_fini = tonga_ih_sw_fini,
 455         .hw_init = tonga_ih_hw_init,
 456         .hw_fini = tonga_ih_hw_fini,
 457         .suspend = tonga_ih_suspend,
 458         .resume = tonga_ih_resume,
 459         .is_idle = tonga_ih_is_idle,
 460         .wait_for_idle = tonga_ih_wait_for_idle,
 461         .check_soft_reset = tonga_ih_check_soft_reset,
 462         .pre_soft_reset = tonga_ih_pre_soft_reset,
 463         .soft_reset = tonga_ih_soft_reset,
 464         .post_soft_reset = tonga_ih_post_soft_reset,
 465         .set_clockgating_state = tonga_ih_set_clockgating_state,
 466         .set_powergating_state = tonga_ih_set_powergating_state,
 467 };
 468
 469 static const struct amdgpu_ih_funcs tonga_ih_funcs = {
 470         .get_wptr = tonga_ih_get_wptr,
 471         .decode_iv = tonga_ih_decode_iv,
 472         .set_rptr = tonga_ih_set_rptr
 473 };
 474
 475 static void tonga_ih_set_interrupt_funcs(struct amdgpu_device *adev)
 476 {
 477         adev->irq.ih_funcs = &tonga_ih_funcs;
 478 }
 479
 480 const struct amdgpu_ip_block_version tonga_ih_ip_block =
 481 {
 482         .type = AMD_IP_BLOCK_TYPE_IH,
 483         .major = 3,
 484         .minor = 0,
 485         .rev = 0,
 486         .funcs = &tonga_ih_ip_funcs,
 487 };