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_2_4_d.h" 31 #include "oss/oss_2_4_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 iceland_ih_set_interrupt_funcs(struct amdgpu_device *adev); 52 53 /** 54 * iceland_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 iceland_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 * iceland_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 iceland_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 * iceland_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 iceland_ih_irq_init(struct amdgpu_device *adev) 107 { 108 struct amdgpu_ih_ring *ih = &adev->irq.ih; 109 int rb_bufsz; 110 u32 interrupt_cntl, ih_cntl, ih_rb_cntl; 111 112 /* disable irqs */ 113 iceland_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 iceland_ih_enable_interrupts(adev); 159 160 return 0; 161 } 162 163 /** 164 * iceland_ih_irq_disable - disable interrupts 165 * 166 * @adev: amdgpu_device pointer 167 * 168 * Disable interrupts on the hw (VI). 169 */ 170 static void iceland_ih_irq_disable(struct amdgpu_device *adev) 171 { 172 iceland_ih_disable_interrupts(adev); 173 174 /* Wait and acknowledge irq */ 175 mdelay(1); 176 } 177 178 /** 179 * iceland_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 iceland_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 /* When a ring buffer overflow happen start parsing interrupt 208 * from the last not overwritten vector (wptr + 16). Hopefully 209 * this should allow us to catchup. 210 */ 211 dev_warn(adev->dev, "IH ring buffer overflow (0x%08X, 0x%08X, 0x%08X)\n", 212 wptr, ih->rptr, (wptr + 16) & ih->ptr_mask); 213 ih->rptr = (wptr + 16) & ih->ptr_mask; 214 tmp = RREG32(mmIH_RB_CNTL); 215 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 1); 216 WREG32(mmIH_RB_CNTL, tmp); 217 218 /* Unset the CLEAR_OVERFLOW bit immediately so new overflows 219 * can be detected. 220 */ 221 tmp = REG_SET_FIELD(tmp, IH_RB_CNTL, WPTR_OVERFLOW_CLEAR, 0); 222 WREG32(mmIH_RB_CNTL, tmp); 223 224 out: 225 return (wptr & ih->ptr_mask); 226 } 227 228 /** 229 * iceland_ih_decode_iv - decode an interrupt vector 230 * 231 * @adev: amdgpu_device pointer 232 * @ih: IH ring buffer to decode 233 * @entry: IV entry to place decoded information into 234 * 235 * Decodes the interrupt vector at the current rptr 236 * position and also advance the position. 237 */ 238 static void iceland_ih_decode_iv(struct amdgpu_device *adev, 239 struct amdgpu_ih_ring *ih, 240 struct amdgpu_iv_entry *entry) 241 { 242 /* wptr/rptr are in bytes! */ 243 u32 ring_index = ih->rptr >> 2; 244 uint32_t dw[4]; 245 246 dw[0] = le32_to_cpu(ih->ring[ring_index + 0]); 247 dw[1] = le32_to_cpu(ih->ring[ring_index + 1]); 248 dw[2] = le32_to_cpu(ih->ring[ring_index + 2]); 249 dw[3] = le32_to_cpu(ih->ring[ring_index + 3]); 250 251 entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY; 252 entry->src_id = dw[0] & 0xff; 253 entry->src_data[0] = dw[1] & 0xfffffff; 254 entry->ring_id = dw[2] & 0xff; 255 entry->vmid = (dw[2] >> 8) & 0xff; 256 entry->pasid = (dw[2] >> 16) & 0xffff; 257 258 /* wptr/rptr are in bytes! */ 259 ih->rptr += 16; 260 } 261 262 /** 263 * iceland_ih_set_rptr - set the IH ring buffer rptr 264 * 265 * @adev: amdgpu_device pointer 266 * @ih: IH ring buffer to set rptr 267 * 268 * Set the IH ring buffer rptr. 269 */ 270 static void iceland_ih_set_rptr(struct amdgpu_device *adev, 271 struct amdgpu_ih_ring *ih) 272 { 273 WREG32(mmIH_RB_RPTR, ih->rptr); 274 } 275 276 static int iceland_ih_early_init(void *handle) 277 { 278 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 279 int ret; 280 281 ret = amdgpu_irq_add_domain(adev); 282 if (ret) 283 return ret; 284 285 iceland_ih_set_interrupt_funcs(adev); 286 287 return 0; 288 } 289 290 static int iceland_ih_sw_init(void *handle) 291 { 292 int r; 293 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 294 295 r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, false); 296 if (r) 297 return r; 298 299 r = amdgpu_irq_init(adev); 300 301 return r; 302 } 303 304 static int iceland_ih_sw_fini(void *handle) 305 { 306 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 307 308 amdgpu_irq_fini_sw(adev); 309 amdgpu_irq_remove_domain(adev); 310 311 return 0; 312 } 313 314 static int iceland_ih_hw_init(void *handle) 315 { 316 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 317 318 return iceland_ih_irq_init(adev); 319 } 320 321 static int iceland_ih_hw_fini(void *handle) 322 { 323 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 324 325 iceland_ih_irq_disable(adev); 326 327 return 0; 328 } 329 330 static int iceland_ih_suspend(void *handle) 331 { 332 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 333 334 return iceland_ih_hw_fini(adev); 335 } 336 337 static int iceland_ih_resume(void *handle) 338 { 339 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 340 341 return iceland_ih_hw_init(adev); 342 } 343 344 static bool iceland_ih_is_idle(void *handle) 345 { 346 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 347 u32 tmp = RREG32(mmSRBM_STATUS); 348 349 if (REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY)) 350 return false; 351 352 return true; 353 } 354 355 static int iceland_ih_wait_for_idle(void *handle) 356 { 357 unsigned i; 358 u32 tmp; 359 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 360 361 for (i = 0; i < adev->usec_timeout; i++) { 362 /* read MC_STATUS */ 363 tmp = RREG32(mmSRBM_STATUS); 364 if (!REG_GET_FIELD(tmp, SRBM_STATUS, IH_BUSY)) 365 return 0; 366 udelay(1); 367 } 368 return -ETIMEDOUT; 369 } 370 371 static int iceland_ih_soft_reset(void *handle) 372 { 373 u32 srbm_soft_reset = 0; 374 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 375 u32 tmp = RREG32(mmSRBM_STATUS); 376 377 if (tmp & SRBM_STATUS__IH_BUSY_MASK) 378 srbm_soft_reset = REG_SET_FIELD(srbm_soft_reset, SRBM_SOFT_RESET, 379 SOFT_RESET_IH, 1); 380 381 if (srbm_soft_reset) { 382 tmp = RREG32(mmSRBM_SOFT_RESET); 383 tmp |= srbm_soft_reset; 384 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp); 385 WREG32(mmSRBM_SOFT_RESET, tmp); 386 tmp = RREG32(mmSRBM_SOFT_RESET); 387 388 udelay(50); 389 390 tmp &= ~srbm_soft_reset; 391 WREG32(mmSRBM_SOFT_RESET, tmp); 392 tmp = RREG32(mmSRBM_SOFT_RESET); 393 394 /* Wait a little for things to settle down */ 395 udelay(50); 396 } 397 398 return 0; 399 } 400 401 static int iceland_ih_set_clockgating_state(void *handle, 402 enum amd_clockgating_state state) 403 { 404 return 0; 405 } 406 407 static int iceland_ih_set_powergating_state(void *handle, 408 enum amd_powergating_state state) 409 { 410 return 0; 411 } 412 413 static const struct amd_ip_funcs iceland_ih_ip_funcs = { 414 .name = "iceland_ih", 415 .early_init = iceland_ih_early_init, 416 .late_init = NULL, 417 .sw_init = iceland_ih_sw_init, 418 .sw_fini = iceland_ih_sw_fini, 419 .hw_init = iceland_ih_hw_init, 420 .hw_fini = iceland_ih_hw_fini, 421 .suspend = iceland_ih_suspend, 422 .resume = iceland_ih_resume, 423 .is_idle = iceland_ih_is_idle, 424 .wait_for_idle = iceland_ih_wait_for_idle, 425 .soft_reset = iceland_ih_soft_reset, 426 .set_clockgating_state = iceland_ih_set_clockgating_state, 427 .set_powergating_state = iceland_ih_set_powergating_state, 428 }; 429 430 static const struct amdgpu_ih_funcs iceland_ih_funcs = { 431 .get_wptr = iceland_ih_get_wptr, 432 .decode_iv = iceland_ih_decode_iv, 433 .set_rptr = iceland_ih_set_rptr 434 }; 435 436 static void iceland_ih_set_interrupt_funcs(struct amdgpu_device *adev) 437 { 438 adev->irq.ih_funcs = &iceland_ih_funcs; 439 } 440 441 const struct amdgpu_ip_block_version iceland_ih_ip_block = 442 { 443 .type = AMD_IP_BLOCK_TYPE_IH, 444 .major = 2, 445 .minor = 4, 446 .rev = 0, 447 .funcs = &iceland_ih_ip_funcs, 448 }; 449