1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2019, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/acpi.h> 7 #include <linux/adreno-smmu-priv.h> 8 #include <linux/delay.h> 9 #include <linux/of_device.h> 10 #include <linux/qcom_scm.h> 11 12 #include "arm-smmu.h" 13 #include "arm-smmu-qcom.h" 14 15 #define QCOM_DUMMY_VAL -1 16 17 static struct qcom_smmu *to_qcom_smmu(struct arm_smmu_device *smmu) 18 { 19 return container_of(smmu, struct qcom_smmu, smmu); 20 } 21 22 static void qcom_smmu_tlb_sync(struct arm_smmu_device *smmu, int page, 23 int sync, int status) 24 { 25 unsigned int spin_cnt, delay; 26 u32 reg; 27 28 arm_smmu_writel(smmu, page, sync, QCOM_DUMMY_VAL); 29 for (delay = 1; delay < TLB_LOOP_TIMEOUT; delay *= 2) { 30 for (spin_cnt = TLB_SPIN_COUNT; spin_cnt > 0; spin_cnt--) { 31 reg = arm_smmu_readl(smmu, page, status); 32 if (!(reg & ARM_SMMU_sTLBGSTATUS_GSACTIVE)) 33 return; 34 cpu_relax(); 35 } 36 udelay(delay); 37 } 38 39 qcom_smmu_tlb_sync_debug(smmu); 40 } 41 42 static void qcom_adreno_smmu_write_sctlr(struct arm_smmu_device *smmu, int idx, 43 u32 reg) 44 { 45 struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); 46 47 /* 48 * On the GPU device we want to process subsequent transactions after a 49 * fault to keep the GPU from hanging 50 */ 51 reg |= ARM_SMMU_SCTLR_HUPCF; 52 53 if (qsmmu->stall_enabled & BIT(idx)) 54 reg |= ARM_SMMU_SCTLR_CFCFG; 55 56 arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_SCTLR, reg); 57 } 58 59 static void qcom_adreno_smmu_get_fault_info(const void *cookie, 60 struct adreno_smmu_fault_info *info) 61 { 62 struct arm_smmu_domain *smmu_domain = (void *)cookie; 63 struct arm_smmu_cfg *cfg = &smmu_domain->cfg; 64 struct arm_smmu_device *smmu = smmu_domain->smmu; 65 66 info->fsr = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSR); 67 info->fsynr0 = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSYNR0); 68 info->fsynr1 = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSYNR1); 69 info->far = arm_smmu_cb_readq(smmu, cfg->cbndx, ARM_SMMU_CB_FAR); 70 info->cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(cfg->cbndx)); 71 info->ttbr0 = arm_smmu_cb_readq(smmu, cfg->cbndx, ARM_SMMU_CB_TTBR0); 72 info->contextidr = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_CONTEXTIDR); 73 } 74 75 static void qcom_adreno_smmu_set_stall(const void *cookie, bool enabled) 76 { 77 struct arm_smmu_domain *smmu_domain = (void *)cookie; 78 struct arm_smmu_cfg *cfg = &smmu_domain->cfg; 79 struct qcom_smmu *qsmmu = to_qcom_smmu(smmu_domain->smmu); 80 81 if (enabled) 82 qsmmu->stall_enabled |= BIT(cfg->cbndx); 83 else 84 qsmmu->stall_enabled &= ~BIT(cfg->cbndx); 85 } 86 87 static void qcom_adreno_smmu_resume_translation(const void *cookie, bool terminate) 88 { 89 struct arm_smmu_domain *smmu_domain = (void *)cookie; 90 struct arm_smmu_cfg *cfg = &smmu_domain->cfg; 91 struct arm_smmu_device *smmu = smmu_domain->smmu; 92 u32 reg = 0; 93 94 if (terminate) 95 reg |= ARM_SMMU_RESUME_TERMINATE; 96 97 arm_smmu_cb_write(smmu, cfg->cbndx, ARM_SMMU_CB_RESUME, reg); 98 } 99 100 #define QCOM_ADRENO_SMMU_GPU_SID 0 101 102 static bool qcom_adreno_smmu_is_gpu_device(struct device *dev) 103 { 104 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 105 int i; 106 107 /* 108 * The GPU will always use SID 0 so that is a handy way to uniquely 109 * identify it and configure it for per-instance pagetables 110 */ 111 for (i = 0; i < fwspec->num_ids; i++) { 112 u16 sid = FIELD_GET(ARM_SMMU_SMR_ID, fwspec->ids[i]); 113 114 if (sid == QCOM_ADRENO_SMMU_GPU_SID) 115 return true; 116 } 117 118 return false; 119 } 120 121 static const struct io_pgtable_cfg *qcom_adreno_smmu_get_ttbr1_cfg( 122 const void *cookie) 123 { 124 struct arm_smmu_domain *smmu_domain = (void *)cookie; 125 struct io_pgtable *pgtable = 126 io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops); 127 return &pgtable->cfg; 128 } 129 130 /* 131 * Local implementation to configure TTBR0 with the specified pagetable config. 132 * The GPU driver will call this to enable TTBR0 when per-instance pagetables 133 * are active 134 */ 135 136 static int qcom_adreno_smmu_set_ttbr0_cfg(const void *cookie, 137 const struct io_pgtable_cfg *pgtbl_cfg) 138 { 139 struct arm_smmu_domain *smmu_domain = (void *)cookie; 140 struct io_pgtable *pgtable = io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops); 141 struct arm_smmu_cfg *cfg = &smmu_domain->cfg; 142 struct arm_smmu_cb *cb = &smmu_domain->smmu->cbs[cfg->cbndx]; 143 144 /* The domain must have split pagetables already enabled */ 145 if (cb->tcr[0] & ARM_SMMU_TCR_EPD1) 146 return -EINVAL; 147 148 /* If the pagetable config is NULL, disable TTBR0 */ 149 if (!pgtbl_cfg) { 150 /* Do nothing if it is already disabled */ 151 if ((cb->tcr[0] & ARM_SMMU_TCR_EPD0)) 152 return -EINVAL; 153 154 /* Set TCR to the original configuration */ 155 cb->tcr[0] = arm_smmu_lpae_tcr(&pgtable->cfg); 156 cb->ttbr[0] = FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid); 157 } else { 158 u32 tcr = cb->tcr[0]; 159 160 /* Don't call this again if TTBR0 is already enabled */ 161 if (!(cb->tcr[0] & ARM_SMMU_TCR_EPD0)) 162 return -EINVAL; 163 164 tcr |= arm_smmu_lpae_tcr(pgtbl_cfg); 165 tcr &= ~(ARM_SMMU_TCR_EPD0 | ARM_SMMU_TCR_EPD1); 166 167 cb->tcr[0] = tcr; 168 cb->ttbr[0] = pgtbl_cfg->arm_lpae_s1_cfg.ttbr; 169 cb->ttbr[0] |= FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid); 170 } 171 172 arm_smmu_write_context_bank(smmu_domain->smmu, cb->cfg->cbndx); 173 174 return 0; 175 } 176 177 static int qcom_adreno_smmu_alloc_context_bank(struct arm_smmu_domain *smmu_domain, 178 struct arm_smmu_device *smmu, 179 struct device *dev, int start) 180 { 181 int count; 182 183 /* 184 * Assign context bank 0 to the GPU device so the GPU hardware can 185 * switch pagetables 186 */ 187 if (qcom_adreno_smmu_is_gpu_device(dev)) { 188 start = 0; 189 count = 1; 190 } else { 191 start = 1; 192 count = smmu->num_context_banks; 193 } 194 195 return __arm_smmu_alloc_bitmap(smmu->context_map, start, count); 196 } 197 198 static bool qcom_adreno_can_do_ttbr1(struct arm_smmu_device *smmu) 199 { 200 const struct device_node *np = smmu->dev->of_node; 201 202 if (of_device_is_compatible(np, "qcom,msm8996-smmu-v2")) 203 return false; 204 205 return true; 206 } 207 208 static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain, 209 struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) 210 { 211 struct adreno_smmu_priv *priv; 212 213 smmu_domain->cfg.flush_walk_prefer_tlbiasid = true; 214 215 /* Only enable split pagetables for the GPU device (SID 0) */ 216 if (!qcom_adreno_smmu_is_gpu_device(dev)) 217 return 0; 218 219 /* 220 * All targets that use the qcom,adreno-smmu compatible string *should* 221 * be AARCH64 stage 1 but double check because the arm-smmu code assumes 222 * that is the case when the TTBR1 quirk is enabled 223 */ 224 if (qcom_adreno_can_do_ttbr1(smmu_domain->smmu) && 225 (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) && 226 (smmu_domain->cfg.fmt == ARM_SMMU_CTX_FMT_AARCH64)) 227 pgtbl_cfg->quirks |= IO_PGTABLE_QUIRK_ARM_TTBR1; 228 229 /* 230 * Initialize private interface with GPU: 231 */ 232 233 priv = dev_get_drvdata(dev); 234 priv->cookie = smmu_domain; 235 priv->get_ttbr1_cfg = qcom_adreno_smmu_get_ttbr1_cfg; 236 priv->set_ttbr0_cfg = qcom_adreno_smmu_set_ttbr0_cfg; 237 priv->get_fault_info = qcom_adreno_smmu_get_fault_info; 238 priv->set_stall = qcom_adreno_smmu_set_stall; 239 priv->resume_translation = qcom_adreno_smmu_resume_translation; 240 241 return 0; 242 } 243 244 static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = { 245 { .compatible = "qcom,adreno" }, 246 { .compatible = "qcom,mdp4" }, 247 { .compatible = "qcom,mdss" }, 248 { .compatible = "qcom,sc7180-mdss" }, 249 { .compatible = "qcom,sc7180-mss-pil" }, 250 { .compatible = "qcom,sc7280-mdss" }, 251 { .compatible = "qcom,sc7280-mss-pil" }, 252 { .compatible = "qcom,sc8180x-mdss" }, 253 { .compatible = "qcom,sm8250-mdss" }, 254 { .compatible = "qcom,sdm845-mdss" }, 255 { .compatible = "qcom,sdm845-mss-pil" }, 256 { } 257 }; 258 259 static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain, 260 struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) 261 { 262 smmu_domain->cfg.flush_walk_prefer_tlbiasid = true; 263 264 return 0; 265 } 266 267 static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu) 268 { 269 unsigned int last_s2cr = ARM_SMMU_GR0_S2CR(smmu->num_mapping_groups - 1); 270 struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); 271 u32 reg; 272 u32 smr; 273 int i; 274 275 /* 276 * With some firmware versions writes to S2CR of type FAULT are 277 * ignored, and writing BYPASS will end up written as FAULT in the 278 * register. Perform a write to S2CR to detect if this is the case and 279 * if so reserve a context bank to emulate bypass streams. 280 */ 281 reg = FIELD_PREP(ARM_SMMU_S2CR_TYPE, S2CR_TYPE_BYPASS) | 282 FIELD_PREP(ARM_SMMU_S2CR_CBNDX, 0xff) | 283 FIELD_PREP(ARM_SMMU_S2CR_PRIVCFG, S2CR_PRIVCFG_DEFAULT); 284 arm_smmu_gr0_write(smmu, last_s2cr, reg); 285 reg = arm_smmu_gr0_read(smmu, last_s2cr); 286 if (FIELD_GET(ARM_SMMU_S2CR_TYPE, reg) != S2CR_TYPE_BYPASS) { 287 qsmmu->bypass_quirk = true; 288 qsmmu->bypass_cbndx = smmu->num_context_banks - 1; 289 290 set_bit(qsmmu->bypass_cbndx, smmu->context_map); 291 292 arm_smmu_cb_write(smmu, qsmmu->bypass_cbndx, ARM_SMMU_CB_SCTLR, 0); 293 294 reg = FIELD_PREP(ARM_SMMU_CBAR_TYPE, CBAR_TYPE_S1_TRANS_S2_BYPASS); 295 arm_smmu_gr1_write(smmu, ARM_SMMU_GR1_CBAR(qsmmu->bypass_cbndx), reg); 296 } 297 298 for (i = 0; i < smmu->num_mapping_groups; i++) { 299 smr = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_SMR(i)); 300 301 if (FIELD_GET(ARM_SMMU_SMR_VALID, smr)) { 302 /* Ignore valid bit for SMR mask extraction. */ 303 smr &= ~ARM_SMMU_SMR_VALID; 304 smmu->smrs[i].id = FIELD_GET(ARM_SMMU_SMR_ID, smr); 305 smmu->smrs[i].mask = FIELD_GET(ARM_SMMU_SMR_MASK, smr); 306 smmu->smrs[i].valid = true; 307 308 smmu->s2crs[i].type = S2CR_TYPE_BYPASS; 309 smmu->s2crs[i].privcfg = S2CR_PRIVCFG_DEFAULT; 310 smmu->s2crs[i].cbndx = 0xff; 311 } 312 } 313 314 return 0; 315 } 316 317 static void qcom_smmu_write_s2cr(struct arm_smmu_device *smmu, int idx) 318 { 319 struct arm_smmu_s2cr *s2cr = smmu->s2crs + idx; 320 struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); 321 u32 cbndx = s2cr->cbndx; 322 u32 type = s2cr->type; 323 u32 reg; 324 325 if (qsmmu->bypass_quirk) { 326 if (type == S2CR_TYPE_BYPASS) { 327 /* 328 * Firmware with quirky S2CR handling will substitute 329 * BYPASS writes with FAULT, so point the stream to the 330 * reserved context bank and ask for translation on the 331 * stream 332 */ 333 type = S2CR_TYPE_TRANS; 334 cbndx = qsmmu->bypass_cbndx; 335 } else if (type == S2CR_TYPE_FAULT) { 336 /* 337 * Firmware with quirky S2CR handling will ignore FAULT 338 * writes, so trick it to write FAULT by asking for a 339 * BYPASS. 340 */ 341 type = S2CR_TYPE_BYPASS; 342 cbndx = 0xff; 343 } 344 } 345 346 reg = FIELD_PREP(ARM_SMMU_S2CR_TYPE, type) | 347 FIELD_PREP(ARM_SMMU_S2CR_CBNDX, cbndx) | 348 FIELD_PREP(ARM_SMMU_S2CR_PRIVCFG, s2cr->privcfg); 349 arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_S2CR(idx), reg); 350 } 351 352 static int qcom_smmu_def_domain_type(struct device *dev) 353 { 354 const struct of_device_id *match = 355 of_match_device(qcom_smmu_client_of_match, dev); 356 357 return match ? IOMMU_DOMAIN_IDENTITY : 0; 358 } 359 360 static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu) 361 { 362 int ret; 363 364 /* 365 * To address performance degradation in non-real time clients, 366 * such as USB and UFS, turn off wait-for-safe on sdm845 based boards, 367 * such as MTP and db845, whose firmwares implement secure monitor 368 * call handlers to turn on/off the wait-for-safe logic. 369 */ 370 ret = qcom_scm_qsmmu500_wait_safe_toggle(0); 371 if (ret) 372 dev_warn(smmu->dev, "Failed to turn off SAFE logic\n"); 373 374 return ret; 375 } 376 377 static int qcom_smmu500_reset(struct arm_smmu_device *smmu) 378 { 379 const struct device_node *np = smmu->dev->of_node; 380 381 arm_mmu500_reset(smmu); 382 383 if (of_device_is_compatible(np, "qcom,sdm845-smmu-500")) 384 return qcom_sdm845_smmu500_reset(smmu); 385 386 return 0; 387 } 388 389 static const struct arm_smmu_impl qcom_smmu_impl = { 390 .init_context = qcom_smmu_init_context, 391 .cfg_probe = qcom_smmu_cfg_probe, 392 .def_domain_type = qcom_smmu_def_domain_type, 393 .reset = qcom_smmu500_reset, 394 .write_s2cr = qcom_smmu_write_s2cr, 395 .tlb_sync = qcom_smmu_tlb_sync, 396 }; 397 398 static const struct arm_smmu_impl qcom_adreno_smmu_impl = { 399 .init_context = qcom_adreno_smmu_init_context, 400 .def_domain_type = qcom_smmu_def_domain_type, 401 .reset = qcom_smmu500_reset, 402 .alloc_context_bank = qcom_adreno_smmu_alloc_context_bank, 403 .write_sctlr = qcom_adreno_smmu_write_sctlr, 404 .tlb_sync = qcom_smmu_tlb_sync, 405 }; 406 407 static struct arm_smmu_device *qcom_smmu_create(struct arm_smmu_device *smmu, 408 const struct arm_smmu_impl *impl) 409 { 410 struct qcom_smmu *qsmmu; 411 412 /* Check to make sure qcom_scm has finished probing */ 413 if (!qcom_scm_is_available()) 414 return ERR_PTR(-EPROBE_DEFER); 415 416 qsmmu = devm_krealloc(smmu->dev, smmu, sizeof(*qsmmu), GFP_KERNEL); 417 if (!qsmmu) 418 return ERR_PTR(-ENOMEM); 419 420 qsmmu->smmu.impl = impl; 421 qsmmu->cfg = qcom_smmu_impl_data(smmu); 422 423 return &qsmmu->smmu; 424 } 425 426 static const struct of_device_id __maybe_unused qcom_smmu_impl_of_match[] = { 427 { .compatible = "qcom,msm8998-smmu-v2" }, 428 { .compatible = "qcom,qcm2290-smmu-500" }, 429 { .compatible = "qcom,sc7180-smmu-500" }, 430 { .compatible = "qcom,sc7280-smmu-500" }, 431 { .compatible = "qcom,sc8180x-smmu-500" }, 432 { .compatible = "qcom,sc8280xp-smmu-500" }, 433 { .compatible = "qcom,sdm630-smmu-v2" }, 434 { .compatible = "qcom,sdm845-smmu-500" }, 435 { .compatible = "qcom,sm6125-smmu-500" }, 436 { .compatible = "qcom,sm6350-smmu-500" }, 437 { .compatible = "qcom,sm6375-smmu-500" }, 438 { .compatible = "qcom,sm8150-smmu-500" }, 439 { .compatible = "qcom,sm8250-smmu-500" }, 440 { .compatible = "qcom,sm8350-smmu-500" }, 441 { .compatible = "qcom,sm8450-smmu-500" }, 442 { } 443 }; 444 445 #ifdef CONFIG_ACPI 446 static struct acpi_platform_list qcom_acpi_platlist[] = { 447 { "LENOVO", "CB-01 ", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" }, 448 { "QCOM ", "QCOMEDK2", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" }, 449 { } 450 }; 451 #endif 452 453 struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu) 454 { 455 const struct device_node *np = smmu->dev->of_node; 456 457 #ifdef CONFIG_ACPI 458 if (np == NULL) { 459 /* Match platform for ACPI boot */ 460 if (acpi_match_platform_list(qcom_acpi_platlist) >= 0) 461 return qcom_smmu_create(smmu, &qcom_smmu_impl); 462 } 463 #endif 464 465 /* 466 * Do not change this order of implementation, i.e., first adreno 467 * smmu impl and then apss smmu since we can have both implementing 468 * arm,mmu-500 in which case we will miss setting adreno smmu specific 469 * features if the order is changed. 470 */ 471 if (of_device_is_compatible(np, "qcom,adreno-smmu")) 472 return qcom_smmu_create(smmu, &qcom_adreno_smmu_impl); 473 474 if (of_match_node(qcom_smmu_impl_of_match, np)) 475 return qcom_smmu_create(smmu, &qcom_smmu_impl); 476 477 return smmu; 478 } 479