kernel/drivers/gpu/drm/amd/amdgpu/cz_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_1_d.h"
  29 #include "oss/oss_3_0_1_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 cz_ih_set_interrupt_funcs(struct amdgpu_device *adev);
  50
  51 /**
  52  * cz_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 cz_ih_enable_interrupts(struct amdgpu_device *adev)
  59 {
  60         u32 ih_cntl = RREG32(mmIH_CNTL);
  61         u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
  62
  63         ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 1);
  64         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1);
  65         WREG32(mmIH_CNTL, ih_cntl);
  66         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
  67         adev->irq.ih.enabled = true;
  68 }
  69
  70 /**
  71  * cz_ih_disable_interrupts - Disable the interrupt ring buffer
  72  *
  73  * @adev: amdgpu_device pointer
  74  *
  75  * Disable the interrupt ring buffer (VI).
  76  */
  77 static void cz_ih_disable_interrupts(struct amdgpu_device *adev)
  78 {
  79         u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL);
  80         u32 ih_cntl = RREG32(mmIH_CNTL);
  81
  82         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0);
  83         ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 0);
  84         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
  85         WREG32(mmIH_CNTL, ih_cntl);
  86         /* set rptr, wptr to 0 */
  87         WREG32(mmIH_RB_RPTR, 0);
  88         WREG32(mmIH_RB_WPTR, 0);
  89         adev->irq.ih.enabled = false;
  90         adev->irq.ih.rptr = 0;
  91 }
  92
  93 /**
  94  * cz_ih_irq_init - init and enable the interrupt ring
  95  *
  96  * @adev: amdgpu_device pointer
  97  *
  98  * Allocate a ring buffer for the interrupt controller,
  99  * enable the RLC, disable interrupts, enable the IH
 100  * ring buffer and enable it (VI).
 101  * Called at device load and reume.
 102  * Returns 0 for success, errors for failure.
 103  */
 104 static int cz_ih_irq_init(struct amdgpu_device *adev)
 105 {
 106         int ret = 0;
 107         int rb_bufsz;
 108         u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
 109         u64 wptr_off;
 110
 111         /* disable irqs */
 112         cz_ih_disable_interrupts(adev);
 113
 114         /* setup interrupt control */
 115         WREG32(mmINTERRUPT_CNTL2, adev->dummy_page.addr >> 8);
 116         interrupt_cntl = RREG32(mmINTERRUPT_CNTL);
 117         /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
 118          * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN
 119          */
 120         interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0);
 121         /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
 122         interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0);
 123         WREG32(mmINTERRUPT_CNTL, interrupt_cntl);
 124
 125         /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/
 126         WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8);
 127
 128         rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4);
 129         ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_ENABLE, 1);
 130         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
 131         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz);
 132
 133         /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */
 134         ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1);
 135
 136         /* set the writeback address whether it's enabled or not */
 137         wptr_off = adev->wb.gpu_addr + (adev->irq.ih.wptr_offs * 4);
 138         WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(wptr_off));
 139         WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(wptr_off) & 0xFF);
 140
 141         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
 142
 143         /* set rptr, wptr to 0 */
 144         WREG32(mmIH_RB_RPTR, 0);
 145         WREG32(mmIH_RB_WPTR, 0);
 146
 147         /* Default settings for IH_CNTL (disabled at first) */
 148         ih_cntl = RREG32(mmIH_CNTL);
 149         ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, MC_VMID, 0);
 150
 151         if (adev->irq.msi_enabled)
 152                 ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, RPTR_REARM, 1);
 153         WREG32(mmIH_CNTL, ih_cntl);
 154
 155         pci_set_master(adev->pdev);
 156
 157         /* enable interrupts */
 158         cz_ih_enable_interrupts(adev);
 159
 160         return ret;
 161 }
 162
 163 /**
 164  * cz_ih_irq_disable - disable interrupts
 165  *
 166  * @adev: amdgpu_device pointer
 167  *
 168  * Disable interrupts on the hw (VI).
 169  */
 170 static void cz_ih_irq_disable(struct amdgpu_device *adev)
 171 {
 172         cz_ih_disable_interrupts(adev);
 173
 174         /* Wait and acknowledge irq */
 175         mdelay(1);
 176 }
 177
 178 /**
 179  * cz_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 cz_ih_get_wptr(struct amdgpu_device *adev)
 190 {
 191         u32 wptr, tmp;
 192
 193         wptr = le32_to_cpu(adev->wb.wb[adev->irq.ih.wptr_offs]);
 194
 195         if (REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) {
 196                 wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0);
 197                 /* When a ring buffer overflow happen start parsing interrupt
 198                  * from the last not overwritten vector (wptr + 16). Hopefully
 199                  * this should allow us to catchup.
 200                  */
 201                 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
 202                         wptr, adev->irq.ih.rptr, (wptr + 16) & adev->irq.ih.ptr_mask);
 203                 adev->irq.ih.rptr = (wptr + 16) & adev->irq.ih.ptr_mask;
 204                 tmp = RREG32(mmIH_RB_CNTL);
 205                 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1);
 206                 WREG32(mmIH_RB_CNTL, tmp);
 207         }
 208         return (wptr & adev->irq.ih.ptr_mask);
 209 }
 210
 211 /**
 212  * cz_ih_decode_iv - decode an interrupt vector
 213  *
 214  * @adev: amdgpu_device pointer
 215  *
 216  * Decodes the interrupt vector at the current rptr
 217  * position and also advance the position.
 218  */
 219 static void cz_ih_decode_iv(struct amdgpu_device *adev,
 220                                  struct amdgpu_iv_entry *entry)
 221 {
 222         /* wptr/rptr are in bytes! */
 223         u32 ring_index = adev->irq.ih.rptr >> 2;
 224         uint32_t dw[4];
 225
 226         dw[0] = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]);
 227         dw[1] = le32_to_cpu(adev->irq.ih.ring[ring_index + 1]);
 228         dw[2] = le32_to_cpu(adev->irq.ih.ring[ring_index + 2]);
 229         dw[3] = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]);
 230
 231         entry->src_id = dw[0] & 0xff;
 232         entry->src_data = dw[1] & 0xfffffff;
 233         entry->ring_id = dw[2] & 0xff;
 234         entry->vm_id = (dw[2] >> 8) & 0xff;
 235         entry->pas_id = (dw[2] >> 16) & 0xffff;
 236
 237         /* wptr/rptr are in bytes! */
 238         adev->irq.ih.rptr += 16;
 239 }
 240
 241 /**
 242  * cz_ih_set_rptr - set the IH ring buffer rptr
 243  *
 244  * @adev: amdgpu_device pointer
 245  *
 246  * Set the IH ring buffer rptr.
 247  */
 248 static void cz_ih_set_rptr(struct amdgpu_device *adev)
 249 {
 250         WREG32(mmIH_RB_RPTR, adev->irq.ih.rptr);
 251 }
 252
 253 static int cz_ih_early_init(void *handle)
 254 {
 255         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 256
 257         cz_ih_set_interrupt_funcs(adev);
 258         return 0;
 259 }
 260
 261 static int cz_ih_sw_init(void *handle)
 262 {
 263         int r;
 264         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 265
 266         r = amdgpu_ih_ring_init(adev, 64 * 1024, false);
 267         if (r)
 268                 return r;
 269
 270         r = amdgpu_irq_init(adev);
 271
 272         return r;
 273 }
 274
 275 static int cz_ih_sw_fini(void *handle)
 276 {
 277         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 278
 279         amdgpu_irq_fini(adev);
 280         amdgpu_ih_ring_fini(adev);
 281
 282         return 0;
 283 }
 284
 285 static int cz_ih_hw_init(void *handle)
 286 {
 287         int r;
 288         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 289
 290         r = cz_ih_irq_init(adev);
 291         if (r)
 292                 return r;
 293
 294         return 0;
 295 }
 296
 297 static int cz_ih_hw_fini(void *handle)
 298 {
 299         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 300
 301         cz_ih_irq_disable(adev);
 302
 303         return 0;
 304 }
 305
 306 static int cz_ih_suspend(void *handle)
 307 {
 308         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 309
 310         return cz_ih_hw_fini(adev);
 311 }
 312
 313 static int cz_ih_resume(void *handle)
 314 {
 315         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 316
 317         return cz_ih_hw_init(adev);
 318 }
 319
 320 static bool cz_ih_is_idle(void *handle)
 321 {
 322         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 323         u32 tmp = RREG32(mmSRBM_STATUS);
 324
 325         if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
 326                 return false;
 327
 328         return true;
 329 }
 330
 331 static int cz_ih_wait_for_idle(void *handle)
 332 {
 333         unsigned i;
 334         u32 tmp;
 335         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 336
 337         for (i = 0; i < adev->usec_timeout; i++) {
 338                 /* read MC_STATUS */
 339                 tmp = RREG32(mmSRBM_STATUS);
 340                 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY))
 341                         return 0;
 342                 udelay(1);
 343         }
 344         return -ETIMEDOUT;
 345 }
 346
 347 static void cz_ih_print_status(void *handle)
 348 {
 349         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 350
 351         dev_info(adev->dev, "CZ IH registers\n");
 352         dev_info(adev->dev, "  SRBM_STATUS=0x%08X\n",
 353                 RREG32(mmSRBM_STATUS));
 354         dev_info(adev->dev, "  SRBM_STATUS2=0x%08X\n",
 355                 RREG32(mmSRBM_STATUS2));
 356         dev_info(adev->dev, "  INTERRUPT_CNTL=0x%08X\n",
 357                  RREG32(mmINTERRUPT_CNTL));
 358         dev_info(adev->dev, "  INTERRUPT_CNTL2=0x%08X\n",
 359                  RREG32(mmINTERRUPT_CNTL2));
 360         dev_info(adev->dev, "  IH_CNTL=0x%08X\n",
 361                  RREG32(mmIH_CNTL));
 362         dev_info(adev->dev, "  IH_RB_CNTL=0x%08X\n",
 363                  RREG32(mmIH_RB_CNTL));
 364         dev_info(adev->dev, "  IH_RB_BASE=0x%08X\n",
 365                  RREG32(mmIH_RB_BASE));
 366         dev_info(adev->dev, "  IH_RB_WPTR_ADDR_LO=0x%08X\n",
 367                  RREG32(mmIH_RB_WPTR_ADDR_LO));
 368         dev_info(adev->dev, "  IH_RB_WPTR_ADDR_HI=0x%08X\n",
 369                  RREG32(mmIH_RB_WPTR_ADDR_HI));
 370         dev_info(adev->dev, "  IH_RB_RPTR=0x%08X\n",
 371                  RREG32(mmIH_RB_RPTR));
 372         dev_info(adev->dev, "  IH_RB_WPTR=0x%08X\n",
 373                  RREG32(mmIH_RB_WPTR));
 374 }
 375
 376 static int cz_ih_soft_reset(void *handle)
 377 {
 378         u32 srbm_soft_reset = 0;
 379         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 380         u32 tmp = RREG32(mmSRBM_STATUS);
 381
 382         if (tmp & SRBM_STATUS__IH_BUSY_MASK)
 383                 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET,
 384                                                 SOFT_RESET_IH, 1);
 385
 386         if (srbm_soft_reset) {
 387                 cz_ih_print_status((void *)adev);
 388
 389                 tmp = RREG32(mmSRBM_SOFT_RESET);
 390                 tmp |= srbm_soft_reset;
 391                 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
 392                 WREG32(mmSRBM_SOFT_RESET, tmp);
 393                 tmp = RREG32(mmSRBM_SOFT_RESET);
 394
 395                 udelay(50);
 396
 397                 tmp &= ~srbm_soft_reset;
 398                 WREG32(mmSRBM_SOFT_RESET, tmp);
 399                 tmp = RREG32(mmSRBM_SOFT_RESET);
 400
 401                 /* Wait a little for things to settle down */
 402                 udelay(50);
 403
 404                 cz_ih_print_status((void *)adev);
 405         }
 406
 407         return 0;
 408 }
 409
 410 static int cz_ih_set_clockgating_state(void *handle,
 411                                           enum amd_clockgating_state state)
 412 {
 413         // TODO
 414         return 0;
 415 }
 416
 417 static int cz_ih_set_powergating_state(void *handle,
 418                                           enum amd_powergating_state state)
 419 {
 420         // TODO
 421         return 0;
 422 }
 423
 424 const struct amd_ip_funcs cz_ih_ip_funcs = {
 425         .early_init = cz_ih_early_init,
 426         .late_init = NULL,
 427         .sw_init = cz_ih_sw_init,
 428         .sw_fini = cz_ih_sw_fini,
 429         .hw_init = cz_ih_hw_init,
 430         .hw_fini = cz_ih_hw_fini,
 431         .suspend = cz_ih_suspend,
 432         .resume = cz_ih_resume,
 433         .is_idle = cz_ih_is_idle,
 434         .wait_for_idle = cz_ih_wait_for_idle,
 435         .soft_reset = cz_ih_soft_reset,
 436         .print_status = cz_ih_print_status,
 437         .set_clockgating_state = cz_ih_set_clockgating_state,
 438         .set_powergating_state = cz_ih_set_powergating_state,
 439 };
 440
 441 static const struct amdgpu_ih_funcs cz_ih_funcs = {
 442         .get_wptr = cz_ih_get_wptr,
 443         .decode_iv = cz_ih_decode_iv,
 444         .set_rptr = cz_ih_set_rptr
 445 };
 446
 447 static void cz_ih_set_interrupt_funcs(struct amdgpu_device *adev)
 448 {
 449         if (adev->irq.ih_funcs == NULL)
 450                 adev->irq.ih_funcs = &cz_ih_funcs;
 451 }
 452