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

   1 /*
   2  * Copyright 2012 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 "cikd.h"
  27
  28 #include "bif/bif_4_1_d.h"
  29 #include "bif/bif_4_1_sh_mask.h"
  30
  31 #include "oss/oss_2_0_d.h"
  32 #include "oss/oss_2_0_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 cik_ih_set_interrupt_funcs(struct amdgpu_device *adev);
  50
  51 /**
  52  * cik_ih_enable_interrupts - Enable the interrupt ring buffer
  53  *
  54  * @adev: amdgpu_device pointer
  55  *
  56  * Enable the interrupt ring buffer (CIK).
  57  */
  58 static void cik_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 |= IH_CNTL__ENABLE_INTR_MASK;
  64         ih_rb_cntl |= IH_RB_CNTL__RB_ENABLE_MASK;
  65         WREG32(mmIH_CNTL, ih_cntl);
  66         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
  67         adev->irq.ih.enabled = true;
  68 }
  69
  70 /**
  71  * cik_ih_disable_interrupts - Disable the interrupt ring buffer
  72  *
  73  * @adev: amdgpu_device pointer
  74  *
  75  * Disable the interrupt ring buffer (CIK).
  76  */
  77 static void cik_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 &= ~IH_RB_CNTL__RB_ENABLE_MASK;
  83         ih_cntl &= ~IH_CNTL__ENABLE_INTR_MASK;
  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  * cik_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 (CIK).
 101  * Called at device load and reume.
 102  * Returns 0 for success, errors for failure.
 103  */
 104 static int cik_ih_irq_init(struct amdgpu_device *adev)
 105 {
 106         int rb_bufsz;
 107         u32 interrupt_cntl, ih_cntl, ih_rb_cntl;
 108         u64 wptr_off;
 109
 110         /* disable irqs */
 111         cik_ih_disable_interrupts(adev);
 112
 113         /* setup interrupt control */
 114         WREG32(mmINTERRUPT_CNTL2, adev->dummy_page.addr >> 8);
 115         interrupt_cntl = RREG32(mmINTERRUPT_CNTL);
 116         /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi
 117          * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN
 118          */
 119         interrupt_cntl &= ~INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK;
 120         /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */
 121         interrupt_cntl &= ~INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK;
 122         WREG32(mmINTERRUPT_CNTL, interrupt_cntl);
 123
 124         WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8);
 125         rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4);
 126
 127         ih_rb_cntl = (IH_RB_CNTL__WPTR_OVERFLOW_ENABLE_MASK |
 128                       IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK |
 129                       (rb_bufsz << 1));
 130
 131         ih_rb_cntl |= IH_RB_CNTL__WPTR_WRITEBACK_ENABLE_MASK;
 132
 133         /* set the writeback address whether it's enabled or not */
 134         wptr_off = adev->wb.gpu_addr + (adev->irq.ih.wptr_offs * 4);
 135         WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(wptr_off));
 136         WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(wptr_off) & 0xFF);
 137
 138         WREG32(mmIH_RB_CNTL, ih_rb_cntl);
 139
 140         /* set rptr, wptr to 0 */
 141         WREG32(mmIH_RB_RPTR, 0);
 142         WREG32(mmIH_RB_WPTR, 0);
 143
 144         /* Default settings for IH_CNTL (disabled at first) */
 145         ih_cntl = (0x10 << IH_CNTL__MC_WRREQ_CREDIT__SHIFT) |
 146                 (0x10 << IH_CNTL__MC_WR_CLEAN_CNT__SHIFT) |
 147                 (0 << IH_CNTL__MC_VMID__SHIFT);
 148         /* IH_CNTL__RPTR_REARM_MASK only works if msi's are enabled */
 149         if (adev->irq.msi_enabled)
 150                 ih_cntl |= IH_CNTL__RPTR_REARM_MASK;
 151         WREG32(mmIH_CNTL, ih_cntl);
 152
 153         pci_set_master(adev->pdev);
 154
 155         /* enable irqs */
 156         cik_ih_enable_interrupts(adev);
 157
 158         return 0;
 159 }
 160
 161 /**
 162  * cik_ih_irq_disable - disable interrupts
 163  *
 164  * @adev: amdgpu_device pointer
 165  *
 166  * Disable interrupts on the hw (CIK).
 167  */
 168 static void cik_ih_irq_disable(struct amdgpu_device *adev)
 169 {
 170         cik_ih_disable_interrupts(adev);
 171         /* Wait and acknowledge irq */
 172         mdelay(1);
 173 }
 174
 175 /**
 176  * cik_ih_get_wptr - get the IH ring buffer wptr
 177  *
 178  * @adev: amdgpu_device pointer
 179  *
 180  * Get the IH ring buffer wptr from either the register
 181  * or the writeback memory buffer (CIK).  Also check for
 182  * ring buffer overflow and deal with it.
 183  * Used by cik_irq_process().
 184  * Returns the value of the wptr.
 185  */
 186 static u32 cik_ih_get_wptr(struct amdgpu_device *adev)
 187 {
 188         u32 wptr, tmp;
 189
 190         wptr = le32_to_cpu(adev->wb.wb[adev->irq.ih.wptr_offs]);
 191
 192         if (wptr & IH_RB_WPTR__RB_OVERFLOW_MASK) {
 193                 wptr &= ~IH_RB_WPTR__RB_OVERFLOW_MASK;
 194                 /* When a ring buffer overflow happen start parsing interrupt
 195                  * from the last not overwritten vector (wptr + 16). Hopefully
 196                  * this should allow us to catchup.
 197                  */
 198                 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n",
 199                         wptr, adev->irq.ih.rptr, (wptr + 16) & adev->irq.ih.ptr_mask);
 200                 adev->irq.ih.rptr = (wptr + 16) & adev->irq.ih.ptr_mask;
 201                 tmp = RREG32(mmIH_RB_CNTL);
 202                 tmp |= IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK;
 203                 WREG32(mmIH_RB_CNTL, tmp);
 204         }
 205         return (wptr & adev->irq.ih.ptr_mask);
 206 }
 207
 208 /*        CIK IV Ring
 209  * Each IV ring entry is 128 bits:
 210  * [7:0]    - interrupt source id
 211  * [31:8]   - reserved
 212  * [59:32]  - interrupt source data
 213  * [63:60]  - reserved
 214  * [71:64]  - RINGID
 215  *            CP:
 216  *            ME_ID [1:0], PIPE_ID[1:0], QUEUE_ID[2:0]
 217  *            QUEUE_ID - for compute, which of the 8 queues owned by the dispatcher
 218  *                     - for gfx, hw shader state (0=PS...5=LS, 6=CS)
 219  *            ME_ID - 0 = gfx, 1 = first 4 CS pipes, 2 = second 4 CS pipes
 220  *            PIPE_ID - ME0 0=3D
 221  *                    - ME1&2 compute dispatcher (4 pipes each)
 222  *            SDMA:
 223  *            INSTANCE_ID [1:0], QUEUE_ID[1:0]
 224  *            INSTANCE_ID - 0 = sdma0, 1 = sdma1
 225  *            QUEUE_ID - 0 = gfx, 1 = rlc0, 2 = rlc1
 226  * [79:72]  - VMID
 227  * [95:80]  - PASID
 228  * [127:96] - reserved
 229  */
 230
 231  /**
 232  * cik_ih_decode_iv - decode an interrupt vector
 233  *
 234  * @adev: amdgpu_device pointer
 235  *
 236  * Decodes the interrupt vector at the current rptr
 237  * position and also advance the position.
 238  */
 239 static void cik_ih_decode_iv(struct amdgpu_device *adev,
 240                              struct amdgpu_iv_entry *entry)
 241 {
 242         /* wptr/rptr are in bytes! */
 243         u32 ring_index = adev->irq.ih.rptr >> 2;
 244         uint32_t dw[4];
 245
 246         dw[0] = le32_to_cpu(adev->irq.ih.ring[ring_index + 0]);
 247         dw[1] = le32_to_cpu(adev->irq.ih.ring[ring_index + 1]);
 248         dw[2] = le32_to_cpu(adev->irq.ih.ring[ring_index + 2]);
 249         dw[3] = le32_to_cpu(adev->irq.ih.ring[ring_index + 3]);
 250
 251         entry->src_id = dw[0] & 0xff;
 252         entry->src_data = dw[1] & 0xfffffff;
 253         entry->ring_id = dw[2] & 0xff;
 254         entry->vm_id = (dw[2] >> 8) & 0xff;
 255         entry->pas_id = (dw[2] >> 16) & 0xffff;
 256
 257         /* wptr/rptr are in bytes! */
 258         adev->irq.ih.rptr += 16;
 259 }
 260
 261 /**
 262  * cik_ih_set_rptr - set the IH ring buffer rptr
 263  *
 264  * @adev: amdgpu_device pointer
 265  *
 266  * Set the IH ring buffer rptr.
 267  */
 268 static void cik_ih_set_rptr(struct amdgpu_device *adev)
 269 {
 270         WREG32(mmIH_RB_RPTR, adev->irq.ih.rptr);
 271 }
 272
 273 static int cik_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         cik_ih_set_interrupt_funcs(adev);
 283
 284         return 0;
 285 }
 286
 287 static int cik_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, 64 * 1024, false);
 293         if (r)
 294                 return r;
 295
 296         r = amdgpu_irq_init(adev);
 297
 298         return r;
 299 }
 300
 301 static int cik_ih_sw_fini(void *handle)
 302 {
 303         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 304
 305         amdgpu_irq_fini(adev);
 306         amdgpu_ih_ring_fini(adev);
 307         amdgpu_irq_remove_domain(adev);
 308
 309         return 0;
 310 }
 311
 312 static int cik_ih_hw_init(void *handle)
 313 {
 314         int r;
 315         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 316
 317         r = cik_ih_irq_init(adev);
 318         if (r)
 319                 return r;
 320
 321         return 0;
 322 }
 323
 324 static int cik_ih_hw_fini(void *handle)
 325 {
 326         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 327
 328         cik_ih_irq_disable(adev);
 329
 330         return 0;
 331 }
 332
 333 static int cik_ih_suspend(void *handle)
 334 {
 335         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 336
 337         return cik_ih_hw_fini(adev);
 338 }
 339
 340 static int cik_ih_resume(void *handle)
 341 {
 342         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 343
 344         return cik_ih_hw_init(adev);
 345 }
 346
 347 static bool cik_ih_is_idle(void *handle)
 348 {
 349         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 350         u32 tmp = RREG32(mmSRBM_STATUS);
 351
 352         if (tmp & SRBM_STATUS__IH_BUSY_MASK)
 353                 return false;
 354
 355         return true;
 356 }
 357
 358 static int cik_ih_wait_for_idle(void *handle)
 359 {
 360         unsigned i;
 361         u32 tmp;
 362         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 363
 364         for (i = 0; i < adev->usec_timeout; i++) {
 365                 /* read MC_STATUS */
 366                 tmp = RREG32(mmSRBM_STATUS) & SRBM_STATUS__IH_BUSY_MASK;
 367                 if (!tmp)
 368                         return 0;
 369                 udelay(1);
 370         }
 371         return -ETIMEDOUT;
 372 }
 373
 374 static int cik_ih_soft_reset(void *handle)
 375 {
 376         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 377
 378         u32 srbm_soft_reset = 0;
 379         u32 tmp = RREG32(mmSRBM_STATUS);
 380
 381         if (tmp & SRBM_STATUS__IH_BUSY_MASK)
 382                 srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_IH_MASK;
 383
 384         if (srbm_soft_reset) {
 385                 tmp = RREG32(mmSRBM_SOFT_RESET);
 386                 tmp |= srbm_soft_reset;
 387                 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp);
 388                 WREG32(mmSRBM_SOFT_RESET, tmp);
 389                 tmp = RREG32(mmSRBM_SOFT_RESET);
 390
 391                 udelay(50);
 392
 393                 tmp &= ~srbm_soft_reset;
 394                 WREG32(mmSRBM_SOFT_RESET, tmp);
 395                 tmp = RREG32(mmSRBM_SOFT_RESET);
 396
 397                 /* Wait a little for things to settle down */
 398                 udelay(50);
 399         }
 400
 401         return 0;
 402 }
 403
 404 static int cik_ih_set_clockgating_state(void *handle,
 405                                           enum amd_clockgating_state state)
 406 {
 407         return 0;
 408 }
 409
 410 static int cik_ih_set_powergating_state(void *handle,
 411                                           enum amd_powergating_state state)
 412 {
 413         return 0;
 414 }
 415
 416 const struct amd_ip_funcs cik_ih_ip_funcs = {
 417         .name = "cik_ih",
 418         .early_init = cik_ih_early_init,
 419         .late_init = NULL,
 420         .sw_init = cik_ih_sw_init,
 421         .sw_fini = cik_ih_sw_fini,
 422         .hw_init = cik_ih_hw_init,
 423         .hw_fini = cik_ih_hw_fini,
 424         .suspend = cik_ih_suspend,
 425         .resume = cik_ih_resume,
 426         .is_idle = cik_ih_is_idle,
 427         .wait_for_idle = cik_ih_wait_for_idle,
 428         .soft_reset = cik_ih_soft_reset,
 429         .set_clockgating_state = cik_ih_set_clockgating_state,
 430         .set_powergating_state = cik_ih_set_powergating_state,
 431 };
 432
 433 static const struct amdgpu_ih_funcs cik_ih_funcs = {
 434         .get_wptr = cik_ih_get_wptr,
 435         .decode_iv = cik_ih_decode_iv,
 436         .set_rptr = cik_ih_set_rptr
 437 };
 438
 439 static void cik_ih_set_interrupt_funcs(struct amdgpu_device *adev)
 440 {
 441         if (adev->irq.ih_funcs == NULL)
 442                 adev->irq.ih_funcs = &cik_ih_funcs;
 443 }