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 24 #include <linux/pci.h> 25 26 #include "amdgpu.h" 27 #include "amdgpu_ih.h" 28 #include "cikd.h" 29 30 #include "bif/bif_4_1_d.h" 31 #include "bif/bif_4_1_sh_mask.h" 32 33 #include "oss/oss_2_0_d.h" 34 #include "oss/oss_2_0_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 cik_ih_set_interrupt_funcs(struct amdgpu_device *adev); 52 53 /** 54 * cik_ih_enable_interrupts - Enable the interrupt ring buffer 55 * 56 * @adev: amdgpu_device pointer 57 * 58 * Enable the interrupt ring buffer (CIK). 59 */ 60 static void cik_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 |= IH_CNTL__ENABLE_INTR_MASK; 66 ih_rb_cntl |= IH_RB_CNTL__RB_ENABLE_MASK; 67 WREG32(mmIH_CNTL, ih_cntl); 68 WREG32(mmIH_RB_CNTL, ih_rb_cntl); 69 adev->irq.ih.enabled = true; 70 } 71 72 /** 73 * cik_ih_disable_interrupts - Disable the interrupt ring buffer 74 * 75 * @adev: amdgpu_device pointer 76 * 77 * Disable the interrupt ring buffer (CIK). 78 */ 79 static void cik_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 &= ~IH_RB_CNTL__RB_ENABLE_MASK; 85 ih_cntl &= ~IH_CNTL__ENABLE_INTR_MASK; 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 * cik_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 (CIK). 103 * Called at device load and reume. 104 * Returns 0 for success, errors for failure. 105 */ 106 static int cik_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 cik_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 &= ~INTERRUPT_CNTL__IH_DUMMY_RD_OVERRIDE_MASK; 122 /* INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK=1 if ring is in non-cacheable memory, e.g., vram */ 123 interrupt_cntl &= ~INTERRUPT_CNTL__IH_REQ_NONSNOOP_EN_MASK; 124 WREG32(mmINTERRUPT_CNTL, interrupt_cntl); 125 126 WREG32(mmIH_RB_BASE, adev->irq.ih.gpu_addr >> 8); 127 rb_bufsz = order_base_2(adev->irq.ih.ring_size / 4); 128 129 ih_rb_cntl = (IH_RB_CNTL__WPTR_OVERFLOW_ENABLE_MASK | 130 IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK | 131 (rb_bufsz << 1)); 132 133 ih_rb_cntl |= IH_RB_CNTL__WPTR_WRITEBACK_ENABLE_MASK; 134 135 /* set the writeback address whether it's enabled or not */ 136 WREG32(mmIH_RB_WPTR_ADDR_LO, lower_32_bits(ih->wptr_addr)); 137 WREG32(mmIH_RB_WPTR_ADDR_HI, upper_32_bits(ih->wptr_addr) & 0xFF); 138 139 WREG32(mmIH_RB_CNTL, ih_rb_cntl); 140 141 /* set rptr, wptr to 0 */ 142 WREG32(mmIH_RB_RPTR, 0); 143 WREG32(mmIH_RB_WPTR, 0); 144 145 /* Default settings for IH_CNTL (disabled at first) */ 146 ih_cntl = (0x10 << IH_CNTL__MC_WRREQ_CREDIT__SHIFT) | 147 (0x10 << IH_CNTL__MC_WR_CLEAN_CNT__SHIFT) | 148 (0 << IH_CNTL__MC_VMID__SHIFT); 149 /* IH_CNTL__RPTR_REARM_MASK only works if msi's are enabled */ 150 if (adev->irq.msi_enabled) 151 ih_cntl |= IH_CNTL__RPTR_REARM_MASK; 152 WREG32(mmIH_CNTL, ih_cntl); 153 154 pci_set_master(adev->pdev); 155 156 /* enable irqs */ 157 cik_ih_enable_interrupts(adev); 158 159 return 0; 160 } 161 162 /** 163 * cik_ih_irq_disable - disable interrupts 164 * 165 * @adev: amdgpu_device pointer 166 * 167 * Disable interrupts on the hw (CIK). 168 */ 169 static void cik_ih_irq_disable(struct amdgpu_device *adev) 170 { 171 cik_ih_disable_interrupts(adev); 172 /* Wait and acknowledge irq */ 173 mdelay(1); 174 } 175 176 /** 177 * cik_ih_get_wptr - get the IH ring buffer wptr 178 * 179 * @adev: amdgpu_device pointer 180 * @ih: IH ring buffer to fetch wptr 181 * 182 * Get the IH ring buffer wptr from either the register 183 * or the writeback memory buffer (CIK). Also check for 184 * ring buffer overflow and deal with it. 185 * Used by cik_irq_process(). 186 * Returns the value of the wptr. 187 */ 188 static u32 cik_ih_get_wptr(struct amdgpu_device *adev, 189 struct amdgpu_ih_ring *ih) 190 { 191 u32 wptr, tmp; 192 193 wptr = le32_to_cpu(*ih->wptr_cpu); 194 195 if (wptr & IH_RB_WPTR__RB_OVERFLOW_MASK) { 196 wptr &= ~IH_RB_WPTR__RB_OVERFLOW_MASK; 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, ih->rptr, (wptr + 16) & ih->ptr_mask); 203 ih->rptr = (wptr + 16) & ih->ptr_mask; 204 tmp = RREG32(mmIH_RB_CNTL); 205 tmp |= IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK; 206 WREG32(mmIH_RB_CNTL, tmp); 207 208 /* Unset the CLEAR_OVERFLOW bit immediately so new overflows 209 * can be detected. 210 */ 211 tmp &= ~IH_RB_CNTL__WPTR_OVERFLOW_CLEAR_MASK; 212 WREG32(mmIH_RB_CNTL, tmp); 213 } 214 return (wptr & ih->ptr_mask); 215 } 216 217 /* CIK IV Ring 218 * Each IV ring entry is 128 bits: 219 * [7:0] - interrupt source id 220 * [31:8] - reserved 221 * [59:32] - interrupt source data 222 * [63:60] - reserved 223 * [71:64] - RINGID 224 * CP: 225 * ME_ID [1:0], PIPE_ID[1:0], QUEUE_ID[2:0] 226 * QUEUE_ID - for compute, which of the 8 queues owned by the dispatcher 227 * - for gfx, hw shader state (0=PS...5=LS, 6=CS) 228 * ME_ID - 0 = gfx, 1 = first 4 CS pipes, 2 = second 4 CS pipes 229 * PIPE_ID - ME0 0=3D 230 * - ME1&2 compute dispatcher (4 pipes each) 231 * SDMA: 232 * INSTANCE_ID [1:0], QUEUE_ID[1:0] 233 * INSTANCE_ID - 0 = sdma0, 1 = sdma1 234 * QUEUE_ID - 0 = gfx, 1 = rlc0, 2 = rlc1 235 * [79:72] - VMID 236 * [95:80] - PASID 237 * [127:96] - reserved 238 */ 239 240 /** 241 * cik_ih_decode_iv - decode an interrupt vector 242 * 243 * @adev: amdgpu_device pointer 244 * 245 * Decodes the interrupt vector at the current rptr 246 * position and also advance the position. 247 */ 248 static void cik_ih_decode_iv(struct amdgpu_device *adev, 249 struct amdgpu_ih_ring *ih, 250 struct amdgpu_iv_entry *entry) 251 { 252 /* wptr/rptr are in bytes! */ 253 u32 ring_index = ih->rptr >> 2; 254 uint32_t dw[4]; 255 256 dw[0] = le32_to_cpu(ih->ring[ring_index + 0]); 257 dw[1] = le32_to_cpu(ih->ring[ring_index + 1]); 258 dw[2] = le32_to_cpu(ih->ring[ring_index + 2]); 259 dw[3] = le32_to_cpu(ih->ring[ring_index + 3]); 260 261 entry->client_id = AMDGPU_IRQ_CLIENTID_LEGACY; 262 entry->src_id = dw[0] & 0xff; 263 entry->src_data[0] = dw[1] & 0xfffffff; 264 entry->ring_id = dw[2] & 0xff; 265 entry->vmid = (dw[2] >> 8) & 0xff; 266 entry->pasid = (dw[2] >> 16) & 0xffff; 267 268 /* wptr/rptr are in bytes! */ 269 ih->rptr += 16; 270 } 271 272 /** 273 * cik_ih_set_rptr - set the IH ring buffer rptr 274 * 275 * @adev: amdgpu_device pointer 276 * @ih: IH ring buffer to set wptr 277 * 278 * Set the IH ring buffer rptr. 279 */ 280 static void cik_ih_set_rptr(struct amdgpu_device *adev, 281 struct amdgpu_ih_ring *ih) 282 { 283 WREG32(mmIH_RB_RPTR, ih->rptr); 284 } 285 286 static int cik_ih_early_init(struct amdgpu_ip_block *ip_block) 287 { 288 struct amdgpu_device *adev = ip_block->adev; 289 int ret; 290 291 ret = amdgpu_irq_add_domain(adev); 292 if (ret) 293 return ret; 294 295 cik_ih_set_interrupt_funcs(adev); 296 297 return 0; 298 } 299 300 static int cik_ih_sw_init(struct amdgpu_ip_block *ip_block) 301 { 302 int r; 303 struct amdgpu_device *adev = ip_block->adev; 304 305 r = amdgpu_ih_ring_init(adev, &adev->irq.ih, 64 * 1024, false); 306 if (r) 307 return r; 308 309 r = amdgpu_irq_init(adev); 310 311 return r; 312 } 313 314 static int cik_ih_sw_fini(struct amdgpu_ip_block *ip_block) 315 { 316 struct amdgpu_device *adev = ip_block->adev; 317 318 amdgpu_irq_fini_sw(adev); 319 amdgpu_irq_remove_domain(adev); 320 321 return 0; 322 } 323 324 static int cik_ih_hw_init(struct amdgpu_ip_block *ip_block) 325 { 326 struct amdgpu_device *adev = ip_block->adev; 327 328 return cik_ih_irq_init(adev); 329 } 330 331 static int cik_ih_hw_fini(struct amdgpu_ip_block *ip_block) 332 { 333 cik_ih_irq_disable(ip_block->adev); 334 335 return 0; 336 } 337 338 static int cik_ih_suspend(struct amdgpu_ip_block *ip_block) 339 { 340 return cik_ih_hw_fini(ip_block); 341 } 342 343 static int cik_ih_resume(struct amdgpu_ip_block *ip_block) 344 { 345 return cik_ih_hw_init(ip_block); 346 } 347 348 static bool cik_ih_is_idle(void *handle) 349 { 350 struct amdgpu_device *adev = (struct amdgpu_device *)handle; 351 u32 tmp = RREG32(mmSRBM_STATUS); 352 353 if (tmp & SRBM_STATUS__IH_BUSY_MASK) 354 return false; 355 356 return true; 357 } 358 359 static int cik_ih_wait_for_idle(struct amdgpu_ip_block *ip_block) 360 { 361 unsigned i; 362 u32 tmp; 363 struct amdgpu_device *adev = ip_block->adev; 364 365 for (i = 0; i < adev->usec_timeout; i++) { 366 /* read MC_STATUS */ 367 tmp = RREG32(mmSRBM_STATUS) & SRBM_STATUS__IH_BUSY_MASK; 368 if (!tmp) 369 return 0; 370 udelay(1); 371 } 372 return -ETIMEDOUT; 373 } 374 375 static int cik_ih_soft_reset(struct amdgpu_ip_block *ip_block) 376 { 377 struct amdgpu_device *adev = ip_block->adev; 378 379 u32 srbm_soft_reset = 0; 380 u32 tmp = RREG32(mmSRBM_STATUS); 381 382 if (tmp & SRBM_STATUS__IH_BUSY_MASK) 383 srbm_soft_reset |= SRBM_SOFT_RESET__SOFT_RESET_IH_MASK; 384 385 if (srbm_soft_reset) { 386 tmp = RREG32(mmSRBM_SOFT_RESET); 387 tmp |= srbm_soft_reset; 388 dev_info(adev->dev, "SRBM_SOFT_RESET=0x%08X\n", tmp); 389 WREG32(mmSRBM_SOFT_RESET, tmp); 390 tmp = RREG32(mmSRBM_SOFT_RESET); 391 392 udelay(50); 393 394 tmp &= ~srbm_soft_reset; 395 WREG32(mmSRBM_SOFT_RESET, tmp); 396 tmp = RREG32(mmSRBM_SOFT_RESET); 397 398 /* Wait a little for things to settle down */ 399 udelay(50); 400 } 401 402 return 0; 403 } 404 405 static int cik_ih_set_clockgating_state(void *handle, 406 enum amd_clockgating_state state) 407 { 408 return 0; 409 } 410 411 static int cik_ih_set_powergating_state(void *handle, 412 enum amd_powergating_state state) 413 { 414 return 0; 415 } 416 417 static const struct amd_ip_funcs cik_ih_ip_funcs = { 418 .name = "cik_ih", 419 .early_init = cik_ih_early_init, 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 adev->irq.ih_funcs = &cik_ih_funcs; 442 } 443 444 const struct amdgpu_ip_block_version cik_ih_ip_block = { 445 .type = AMD_IP_BLOCK_TYPE_IH, 446 .major = 2, 447 .minor = 0, 448 .rev = 0, 449 .funcs = &cik_ih_ip_funcs, 450 }; 451