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 24 #include <linux/pci.h> 25 26 #include "amdgpu.h" 27 #include "amdgpu_ih.h" 28 #include "vid.h" 29 30 #include "oss/oss_3_0_1_d.h" 31 #include "oss/oss_3_0_1_sh_mask.h" 32 33 #include "bif/bif_5_1_d.h" 34 #include "bif/bif_5_1_sh_mask.h" 35 36 /* 37 * Interrupts 38 * Starting with r6xx, interrupts are handled via a ring buffer. 39 * Ring buffers are areas of GPU accessible memory that the GPU 40 * writes interrupt vectors into and the host reads vectors out of. 41 * There is a rptr (read pointer) that determines where the 42 * host is currently reading, and a wptr (write pointer) 43 * which determines where the GPU has written. When the 44 * pointers are equal, the ring is idle. When the GPU 45 * writes vectors to the ring buffer, it increments the 46 * wptr. When there is an interrupt, the host then starts 47 * fetching commands and processing them until the pointers are 48 * equal again at which point it updates the rptr. 49 */ 50 51 static void cz_ih_set_interrupt_funcs(struct amdgpu_device *adev); 52 53 /** 54 * cz_ih_enable_interrupts - Enable the interrupt ring buffer 55 * 56 * @adev: amdgpu_device pointer 57 * 58 * Enable the interrupt ring buffer (VI). 59 */ 60 static void cz_ih_enable_interrupts(struct amdgpu_device *adev) 61 { 62 u32 ih_cntl = RREG32(mmIH_CNTL); 63 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL); 64 65 ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 1); 66 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 1); 67 WREG32(mmIH_CNTL, ih_cntl); 68 WREG32(mmIH_RB_CNTL, ih_rb_cntl); 69 adev->irq.ih.enabled = true; 70 } 71 72 /** 73 * cz_ih_disable_interrupts - Disable the interrupt ring buffer 74 * 75 * @adev: amdgpu_device pointer 76 * 77 * Disable the interrupt ring buffer (VI). 78 */ 79 static void cz_ih_disable_interrupts(struct amdgpu_device *adev) 80 { 81 u32 ih_rb_cntl = RREG32(mmIH_RB_CNTL); 82 u32 ih_cntl = RREG32(mmIH_CNTL); 83 84 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_ENABLE, 0); 85 ih_cntl = REG_SET_FIELD(ih_cntl, IH_CNTL, ENABLE_INTR, 0); 86 WREG32(mmIH_RB_CNTL, ih_rb_cntl); 87 WREG32(mmIH_CNTL, ih_cntl); 88 /* set rptr, wptr to 0 */ 89 WREG32(mmIH_RB_RPTR, 0); 90 WREG32(mmIH_RB_WPTR, 0); 91 adev->irq.ih.enabled = false; 92 adev->irq.ih.rptr = 0; 93 } 94 95 /** 96 * cz_ih_irq_init - init and enable the interrupt ring 97 * 98 * @adev: amdgpu_device pointer 99 * 100 * Allocate a ring buffer for the interrupt controller, 101 * enable the RLC, disable interrupts, enable the IH 102 * ring buffer and enable it (VI). 103 * Called at device load and reume. 104 * Returns 0 for success, errors for failure. 105 */ 106 static int cz_ih_irq_init(struct amdgpu_device *adev) 107 { 108 struct amdgpu_ih_ring *ih = &adev->irq.ih; 109 u32 interrupt_cntl, ih_cntl, ih_rb_cntl; 110 int rb_bufsz; 111 112 /* disable irqs */ 113 cz_ih_disable_interrupts(adev); 114 115 /* setup interrupt control */ 116 WREG32(mmINTERRUPT_CNTL2, adev->dummy_page_addr >> 8); 117 interrupt_cntl = RREG32(mmINTERRUPT_CNTL); 118 /* INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=0 - dummy read disabled with msi, enabled without msi 119 * INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK=1 - dummy read controlled by IH_DUMMY_RD_EN 120 */ 121 interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_DUMMY_RD_OVERRIDE, 0); 122 /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */ 123 interrupt_cntl = REG_SET_FIELD(interrupt_cntl, INTERRUPT_CNTL, IH_REQ_NONSNOOP_EN, 0); 124 WREG32(mmINTERRUPT_CNTL, interrupt_cntl); 125 126 /* Ring Buffer base. [39:8] of 40-bit address of the beginning of the ring buffer*/ 127 WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8); 128 129 rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4); 130 ih_rb_cntl = REG_SET_FIELD(0, IH_RB_CNTL, WPTR_OVERFLOW_ENABLE, 1); 131 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); 132 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, RB_SIZE, rb_bufsz); 133 134 /* Ring Buffer write pointer writeback. If enabled, IH_RB_WPTR register value is written to memory */ 135 ih_rb_cntl = REG_SET_FIELD(ih_rb_cntl, IH_RB_CNTL, WPTR_WRITEBACK_ENABLE, 1); 136 137 /* set the writeback address whether it's enabled or not */ 138 WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr)); 139 WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 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 0; 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 * @ih: IH ring buffer to fetch wptr 183 * 184 * Get the IH ring buffer wptr from either the register 185 * or the writeback memory buffer (VI). Also check for 186 * ring buffer overflow and deal with it. 187 * Used by cz_irq_process(VI). 188 * Returns the value of the wptr. 189 */ 190 static u32 cz_ih_get_wptr(struct amdgpu_device *adev, 191 struct amdgpu_ih_ring *ih) 192 { 193 u32 wptr, tmp; 194 195 wptr = le32_to_cpu(*ih->wptr_cpu); 196 197 if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) 198 goto out; 199 200 /* Double check that the overflow wasn't already cleared. */ 201 wptr = RREG32(mmIH_RB_WPTR); 202 203 if (!REG_GET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW)) 204 goto out; 205 206 wptr = REG_SET_FIELD(wptr, IH_RB_WPTR, RB_OVERFLOW, 0); 207 208 /* 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, ih->rptr, (wptr + 16) & ih->ptr_mask); 214 ih->rptr = (wptr + 16) & 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 /* Unset the CLEAR_OVERFLOW bit immediately so new overflows 220 * can be detected. 221 */ 222 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0); 223 WREG32(mmIH_RB_CNTL, tmp); 224 225 out: 226 return (wptr & ih->ptr_mask); 227 } 228 229 /** 230 * cz_ih_decode_iv - decode an interrupt vector 231 * 232 * @adev: amdgpu_device pointer 233 * @ih: IH ring buffer to decode 234 * @entry: IV entry to place decoded information into 235 * 236 * Decodes the interrupt vector at the current rptr 237 * position and also advance the position. 238 */ 239 static void cz_ih_decode_iv(struct amdgpu_device *adev, 240 struct amdgpu_ih_ring *ih, 241 struct amdgpu_iv_entry *entry) 242 { 243 /* wptr/rptr are in bytes! */ 244 u32 ring_index = ih->rptr >> 2; 245 uint32_t dw[4]; 246 247 dw[0] = le32_to_cpu(ih->ring[ring_index + 0]); 248 dw[1] = le32_to_cpu(ih->ring[ring_index + 1]); 249 dw[2] = le32_to_cpu(ih->ring[ring_index + 2]); 250 dw[3] = le32_to_cpu(ih->ring[ring_index + 3]); 251 252 entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY; 253 entry->src_id = dw[0] & 0xff; 254 entry->src_data[0] = dw[1] & 0xfffffff; 255 entry->ring_id = dw[2] & 0xff; 256 entry->vmid = (dw[2] >> 8) & 0xff; 257 entry->pasid = (dw[2] >> 16) & 0xffff; 258 259 /* wptr/rptr are in bytes! */ 260 ih->rptr += 16; 261 } 262 263 /** 264 * cz_ih_set_rptr - set the IH ring buffer rptr 265 * 266 * @adev: amdgpu_device pointer 267 * @ih: IH ring buffer to set rptr 268 * 269 * Set the IH ring buffer rptr. 270 */ 271 static void cz_ih_set_rptr(struct amdgpu_device *adev, 272 struct amdgpu_ih_ring *ih) 273 { 274 WREG32(mmIH_RB_RPTR, ih->rptr); 275 } 276 277 static int cz_ih_early_init(void *handle) 278 { 279 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 280 int ret; 281 282 ret = amdgpu_irq_add_domain(adev); 283 if (ret) 284 return ret; 285 286 cz_ih_set_interrupt_funcs(adev); 287 288 return 0; 289 } 290 291 static int cz_ih_sw_init(void *handle) 292 { 293 int r; 294 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 295 296 r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, false); 297 if (r) 298 return r; 299 300 r = amdgpu_irq_init(adev); 301 302 return r; 303 } 304 305 static int cz_ih_sw_fini(void *handle) 306 { 307 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 308 309 amdgpu_irq_fini_sw(adev); 310 amdgpu_irq_remove_domain(adev); 311 312 return 0; 313 } 314 315 static int cz_ih_hw_init(void *handle) 316 { 317 int r; 318 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 319 320 r = cz_ih_irq_init(adev); 321 if (r) 322 return r; 323 324 return 0; 325 } 326 327 static int cz_ih_hw_fini(void *handle) 328 { 329 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 330 331 cz_ih_irq_disable(adev); 332 333 return 0; 334 } 335 336 static int cz_ih_suspend(void *handle) 337 { 338 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 339 340 return cz_ih_hw_fini(adev); 341 } 342 343 static int cz_ih_resume(void *handle) 344 { 345 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 346 347 return cz_ih_hw_init(adev); 348 } 349 350 static bool cz_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 cz_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 int cz_ih_soft_reset(void *handle) 378 { 379 u32 srbm_soft_reset = 0; 380 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 381 u32 tmp = RREG32(mmSRBM_STATUS); 382 383 if (tmp & SRBM_STATUS__IH_BUSY_MASK) 384 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET, 385 SOFT_RESET_IH, 1); 386 387 if (srbm_soft_reset) { 388 tmp = RREG32(mmSRBM_SOFT_RESET); 389 tmp |= srbm_soft_reset; 390 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp); 391 WREG32(mmSRBM_SOFT_RESET, tmp); 392 tmp = RREG32(mmSRBM_SOFT_RESET); 393 394 udelay(50); 395 396 tmp &= ~srbm_soft_reset; 397 WREG32(mmSRBM_SOFT_RESET, tmp); 398 tmp = RREG32(mmSRBM_SOFT_RESET); 399 400 /* Wait a little for things to settle down */ 401 udelay(50); 402 } 403 404 return 0; 405 } 406 407 static int cz_ih_set_clockgating_state(void *handle, 408 enum amd_clockgating_state state) 409 { 410 // TODO 411 return 0; 412 } 413 414 static int cz_ih_set_powergating_state(void *handle, 415 enum amd_powergating_state state) 416 { 417 // TODO 418 return 0; 419 } 420 421 static const struct amd_ip_funcs cz_ih_ip_funcs = { 422 .name = "cz_ih", 423 .early_init = cz_ih_early_init, 424 .late_init = NULL, 425 .sw_init = cz_ih_sw_init, 426 .sw_fini = cz_ih_sw_fini, 427 .hw_init = cz_ih_hw_init, 428 .hw_fini = cz_ih_hw_fini, 429 .suspend = cz_ih_suspend, 430 .resume = cz_ih_resume, 431 .is_idle = cz_ih_is_idle, 432 .wait_for_idle = cz_ih_wait_for_idle, 433 .soft_reset = cz_ih_soft_reset, 434 .set_clockgating_state = cz_ih_set_clockgating_state, 435 .set_powergating_state = cz_ih_set_powergating_state, 436 }; 437 438 static const struct amdgpu_ih_funcs cz_ih_funcs = { 439 .get_wptr = cz_ih_get_wptr, 440 .decode_iv = cz_ih_decode_iv, 441 .set_rptr = cz_ih_set_rptr 442 }; 443 444 static void cz_ih_set_interrupt_funcs(struct amdgpu_device *adev) 445 { 446 adev->irq.ih_funcs = &cz_ih_funcs; 447 } 448 449 const struct amdgpu_ip_block_version cz_ih_ip_block = 450 { 451 .type = AMD_IP_BLOCK_TYPE_IH, 452 .major = 3, 453 .minor = 0, 454 .rev = 0, 455 .funcs = &cz_ih_ip_funcs, 456 }; 457