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 "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         int ret;
 277
 278         ret = amdgpu_irq_add_domain(adev);
 279         if (ret)
 280                 return ret;
 281
 282         tonga_ih_set_interrupt_funcs(adev);
 283
 284         return 0;
 285 }
 286
 287 static int tonga_ih_sw_init(void *handle)
 288 {
 289         int r;
 290         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 291
 292         r = amdgpu_ih_ring_init(adev, 4 * 1024, true);
 293         if (r)
 294                 return r;
 295
 296         adev->irq.ih.use_doorbell = true;
 297         adev->irq.ih.doorbell_index = AMDGPU_DOORBELL_IH;
 298
 299         r = amdgpu_irq_init(adev);
 300
 301         return r;
 302 }
 303
 304 static int tonga_ih_sw_fini(void *handle)
 305 {
 306         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 307
 308         amdgpu_irq_fini(adev);
 309         amdgpu_ih_ring_fini(adev);
 310         amdgpu_irq_add_domain(adev);
 311
 312         return 0;
 313 }
 314
 315 static int tonga_ih_hw_init(void *handle)
 316 {
 317         int r;
 318         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 319
 320         r = tonga_ih_irq_init(adev);
 321         if (r)
 322                 return r;
 323
 324         return 0;
 325 }
 326
 327 static int tonga_ih_hw_fini(void *handle)
 328 {
 329         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 330
 331         tonga_ih_irq_disable(adev);
 332
 333         return 0;
 334 }
 335
 336 static int tonga_ih_suspend(void *handle)
 337 {
 338         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 339
 340         return tonga_ih_hw_fini(adev);
 341 }
 342
 343 static int tonga_ih_resume(void *handle)
 344 {
 345         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 346
 347         return tonga_ih_hw_init(adev);
 348 }
 349
 350 static bool tonga_ih_is_idle(void *handle)
 351 {
 352         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 353         u32 tmp = RREG32(mmSRBM_STATUS);
 354
 355         if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
 356                 return false;
 357
 358         return true;
 359 }
 360
 361 static int tonga_ih_wait_for_idle(void *handle)
 362 {
 363         unsigned i;
 364         u32 tmp;
 365         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 366
 367         for (i = 0; i < adev->usec_timeout; i++) {
 368                 /* read MC_STATUS */
 369                 tmp = RREG32(mmSRBM_STATUS);
 370                 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
 371                         return 0;
 372                 udelay(1);
 373         }
 374         return -ETIMEDOUT;
 375 }
 376
 377 static void tonga_ih_print_status(void *handle)
 378 {
 379         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 380
 381         dev_info(adev->dev, "TONGA IH registers\n");
 382         dev_info(adev->dev, "  SRBM_STATUS=0x%08X\n",
 383                 RREG32(mmSRBM_STATUS));
 384         dev_info(adev->dev, "  SRBM_STATUS2=0x%08X\n",
 385                 RREG32(mmSRBM_STATUS2));
 386         dev_info(adev->dev, "  INTERRUPT_CNTL=0x%08X\n",
 387                  RREG32(mmINTERRUPT_CNTL));
 388         dev_info(adev->dev, "  INTERRUPT_CNTL2=0x%08X\n",
 389                  RREG32(mmINTERRUPT_CNTL2));
 390         dev_info(adev->dev, "  IH_CNTL=0x%08X\n",
 391                  RREG32(mmIH_CNTL));
 392         dev_info(adev->dev, "  IH_RB_CNTL=0x%08X\n",
 393                  RREG32(mmIH_RB_CNTL));
 394         dev_info(adev->dev, "  IH_RB_BASE=0x%08X\n",
 395                  RREG32(mmIH_RB_BASE));
 396         dev_info(adev->dev, "  IH_RB_WPTR_ADDR_LO=0x%08X\n",
 397                  RREG32(mmIH_RB_WPTR_ADDR_LO));
 398         dev_info(adev->dev, "  IH_RB_WPTR_ADDR_HI=0x%08X\n",
 399                  RREG32(mmIH_RB_WPTR_ADDR_HI));
 400         dev_info(adev->dev, "  IH_RB_RPTR=0x%08X\n",
 401                  RREG32(mmIH_RB_RPTR));
 402         dev_info(adev->dev, "  IH_RB_WPTR=0x%08X\n",
 403                  RREG32(mmIH_RB_WPTR));
 404 }
 405
 406 static int tonga_ih_soft_reset(void *handle)
 407 {
 408         u32 srbm_soft_reset = 0;
 409         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 410         u32 tmp = RREG32(mmSRBM_STATUS);
 411
 412         if (tmp & SRBM_STATUS__IH_BUSY_MASK)
 413                 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
 414                                                 SOFT_RESET_IH, 1);
 415
 416         if (srbm_soft_reset) {
 417                 tonga_ih_print_status(adev);
 418
 419                 tmp = RREG32(mmSRBM_SOFT_RESET);
 420                 tmp |= srbm_soft_reset;
 421                 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
 422                 WREG32(mmSRBM_SOFT_RESET, tmp);
 423                 tmp = RREG32(mmSRBM_SOFT_RESET);
 424
 425                 udelay(50);
 426
 427                 tmp &= ~srbm_soft_reset;
 428                 WREG32(mmSRBM_SOFT_RESET, tmp);
 429                 tmp = RREG32(mmSRBM_SOFT_RESET);
 430
 431                 /* Wait a little for things to settle down */
 432                 udelay(50);
 433
 434                 tonga_ih_print_status(adev);
 435         }
 436
 437         return 0;
 438 }
 439
 440 static int tonga_ih_set_clockgating_state(void *handle,
 441                                           enum amd_clockgating_state state)
 442 {
 443         return 0;
 444 }
 445
 446 static int tonga_ih_set_powergating_state(void *handle,
 447                                           enum amd_powergating_state state)
 448 {
 449         return 0;
 450 }
 451
 452 const struct amd_ip_funcs tonga_ih_ip_funcs = {
 453         .early_init = tonga_ih_early_init,
 454         .late_init = NULL,
 455         .sw_init = tonga_ih_sw_init,
 456         .sw_fini = tonga_ih_sw_fini,
 457         .hw_init = tonga_ih_hw_init,
 458         .hw_fini = tonga_ih_hw_fini,
 459         .suspend = tonga_ih_suspend,
 460         .resume = tonga_ih_resume,
 461         .is_idle = tonga_ih_is_idle,
 462         .wait_for_idle = tonga_ih_wait_for_idle,
 463         .soft_reset = tonga_ih_soft_reset,
 464         .print_status = tonga_ih_print_status,
 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         if (adev->irq.ih_funcs == NULL)
 478                 adev->irq.ih_funcs = &tonga_ih_funcs;
 479 }
 480