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/of_device.h> 9 #include <linux/qcom_scm.h> 10 11 #include "arm-smmu.h" 12 13 struct qcom_smmu { 14 struct arm_smmu_device smmu; 15 bool bypass_quirk; 16 u8 bypass_cbndx; 17 u32 stall_enabled; 18 }; 19 20 static struct qcom_smmu *to_qcom_smmu(struct arm_smmu_device *smmu) 21 { 22 return container_of(smmu, struct qcom_smmu, smmu); 23 } 24 25 static void qcom_adreno_smmu_write_sctlr(struct arm_smmu_device *smmu, int idx, 26 u32 reg) 27 { 28 struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); 29 30 /* 31 * On the GPU device we want to process subsequent transactions after a 32 * fault to keep the GPU from hanging 33 */ 34 reg |= ARM_SMMU_SCTLR_HUPCF; 35 36 if (qsmmu->stall_enabled & BIT(idx)) 37 reg |= ARM_SMMU_SCTLR_CFCFG; 38 39 arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_SCTLR, reg); 40 } 41 42 static void qcom_adreno_smmu_get_fault_info(const void *cookie, 43 struct adreno_smmu_fault_info *info) 44 { 45 struct arm_smmu_domain *smmu_domain = (void *)cookie; 46 struct arm_smmu_cfg *cfg = &smmu_domain->cfg; 47 struct arm_smmu_device *smmu = smmu_domain->smmu; 48 49 info->fsr = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSR); 50 info->fsynr0 = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSYNR0); 51 info->fsynr1 = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_FSYNR1); 52 info->far = arm_smmu_cb_readq(smmu, cfg->cbndx, ARM_SMMU_CB_FAR); 53 info->cbfrsynra = arm_smmu_gr1_read(smmu, ARM_SMMU_GR1_CBFRSYNRA(cfg->cbndx)); 54 info->ttbr0 = arm_smmu_cb_readq(smmu, cfg->cbndx, ARM_SMMU_CB_TTBR0); 55 info->contextidr = arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_CONTEXTIDR); 56 } 57 58 static void qcom_adreno_smmu_set_stall(const void *cookie, bool enabled) 59 { 60 struct arm_smmu_domain *smmu_domain = (void *)cookie; 61 struct arm_smmu_cfg *cfg = &smmu_domain->cfg; 62 struct qcom_smmu *qsmmu = to_qcom_smmu(smmu_domain->smmu); 63 64 if (enabled) 65 qsmmu->stall_enabled |= BIT(cfg->cbndx); 66 else 67 qsmmu->stall_enabled &= ~BIT(cfg->cbndx); 68 } 69 70 static void qcom_adreno_smmu_resume_translation(const void *cookie, bool terminate) 71 { 72 struct arm_smmu_domain *smmu_domain = (void *)cookie; 73 struct arm_smmu_cfg *cfg = &smmu_domain->cfg; 74 struct arm_smmu_device *smmu = smmu_domain->smmu; 75 u32 reg = 0; 76 77 if (terminate) 78 reg |= ARM_SMMU_RESUME_TERMINATE; 79 80 arm_smmu_cb_write(smmu, cfg->cbndx, ARM_SMMU_CB_RESUME, reg); 81 } 82 83 #define QCOM_ADRENO_SMMU_GPU_SID 0 84 85 static bool qcom_adreno_smmu_is_gpu_device(struct device *dev) 86 { 87 struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); 88 int i; 89 90 /* 91 * The GPU will always use SID 0 so that is a handy way to uniquely 92 * identify it and configure it for per-instance pagetables 93 */ 94 for (i = 0; i < fwspec->num_ids; i++) { 95 u16 sid = FIELD_GET(ARM_SMMU_SMR_ID, fwspec->ids[i]); 96 97 if (sid == QCOM_ADRENO_SMMU_GPU_SID) 98 return true; 99 } 100 101 return false; 102 } 103 104 static const struct io_pgtable_cfg *qcom_adreno_smmu_get_ttbr1_cfg( 105 const void *cookie) 106 { 107 struct arm_smmu_domain *smmu_domain = (void *)cookie; 108 struct io_pgtable *pgtable = 109 io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops); 110 return &pgtable->cfg; 111 } 112 113 /* 114 * Local implementation to configure TTBR0 with the specified pagetable config. 115 * The GPU driver will call this to enable TTBR0 when per-instance pagetables 116 * are active 117 */ 118 119 static int qcom_adreno_smmu_set_ttbr0_cfg(const void *cookie, 120 const struct io_pgtable_cfg *pgtbl_cfg) 121 { 122 struct arm_smmu_domain *smmu_domain = (void *)cookie; 123 struct io_pgtable *pgtable = io_pgtable_ops_to_pgtable(smmu_domain->pgtbl_ops); 124 struct arm_smmu_cfg *cfg = &smmu_domain->cfg; 125 struct arm_smmu_cb *cb = &smmu_domain->smmu->cbs[cfg->cbndx]; 126 127 /* The domain must have split pagetables already enabled */ 128 if (cb->tcr[0] & ARM_SMMU_TCR_EPD1) 129 return -EINVAL; 130 131 /* If the pagetable config is NULL, disable TTBR0 */ 132 if (!pgtbl_cfg) { 133 /* Do nothing if it is already disabled */ 134 if ((cb->tcr[0] & ARM_SMMU_TCR_EPD0)) 135 return -EINVAL; 136 137 /* Set TCR to the original configuration */ 138 cb->tcr[0] = arm_smmu_lpae_tcr(&pgtable->cfg); 139 cb->ttbr[0] = FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid); 140 } else { 141 u32 tcr = cb->tcr[0]; 142 143 /* Don't call this again if TTBR0 is already enabled */ 144 if (!(cb->tcr[0] & ARM_SMMU_TCR_EPD0)) 145 return -EINVAL; 146 147 tcr |= arm_smmu_lpae_tcr(pgtbl_cfg); 148 tcr &= ~(ARM_SMMU_TCR_EPD0 | ARM_SMMU_TCR_EPD1); 149 150 cb->tcr[0] = tcr; 151 cb->ttbr[0] = pgtbl_cfg->arm_lpae_s1_cfg.ttbr; 152 cb->ttbr[0] |= FIELD_PREP(ARM_SMMU_TTBRn_ASID, cb->cfg->asid); 153 } 154 155 arm_smmu_write_context_bank(smmu_domain->smmu, cb->cfg->cbndx); 156 157 return 0; 158 } 159 160 static int qcom_adreno_smmu_alloc_context_bank(struct arm_smmu_domain *smmu_domain, 161 struct arm_smmu_device *smmu, 162 struct device *dev, int start) 163 { 164 int count; 165 166 /* 167 * Assign context bank 0 to the GPU device so the GPU hardware can 168 * switch pagetables 169 */ 170 if (qcom_adreno_smmu_is_gpu_device(dev)) { 171 start = 0; 172 count = 1; 173 } else { 174 start = 1; 175 count = smmu->num_context_banks; 176 } 177 178 return __arm_smmu_alloc_bitmap(smmu->context_map, start, count); 179 } 180 181 static bool qcom_adreno_can_do_ttbr1(struct arm_smmu_device *smmu) 182 { 183 const struct device_node *np = smmu->dev->of_node; 184 185 if (of_device_is_compatible(np, "qcom,msm8996-smmu-v2")) 186 return false; 187 188 return true; 189 } 190 191 static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain, 192 struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) 193 { 194 struct adreno_smmu_priv *priv; 195 196 smmu_domain->cfg.flush_walk_prefer_tlbiasid = true; 197 198 /* Only enable split pagetables for the GPU device (SID 0) */ 199 if (!qcom_adreno_smmu_is_gpu_device(dev)) 200 return 0; 201 202 /* 203 * All targets that use the qcom,adreno-smmu compatible string *should* 204 * be AARCH64 stage 1 but double check because the arm-smmu code assumes 205 * that is the case when the TTBR1 quirk is enabled 206 */ 207 if (qcom_adreno_can_do_ttbr1(smmu_domain->smmu) && 208 (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) && 209 (smmu_domain->cfg.fmt == ARM_SMMU_CTX_FMT_AARCH64)) 210 pgtbl_cfg->quirks |= IO_PGTABLE_QUIRK_ARM_TTBR1; 211 212 /* 213 * Initialize private interface with GPU: 214 */ 215 216 priv = dev_get_drvdata(dev); 217 priv->cookie = smmu_domain; 218 priv->get_ttbr1_cfg = qcom_adreno_smmu_get_ttbr1_cfg; 219 priv->set_ttbr0_cfg = qcom_adreno_smmu_set_ttbr0_cfg; 220 priv->get_fault_info = qcom_adreno_smmu_get_fault_info; 221 priv->set_stall = qcom_adreno_smmu_set_stall; 222 priv->resume_translation = qcom_adreno_smmu_resume_translation; 223 224 return 0; 225 } 226 227 static const struct of_device_id qcom_smmu_client_of_match[] __maybe_unused = { 228 { .compatible = "qcom,adreno" }, 229 { .compatible = "qcom,mdp4" }, 230 { .compatible = "qcom,mdss" }, 231 { .compatible = "qcom,sc7180-mdss" }, 232 { .compatible = "qcom,sc7180-mss-pil" }, 233 { .compatible = "qcom,sc7280-mdss" }, 234 { .compatible = "qcom,sc7280-mss-pil" }, 235 { .compatible = "qcom,sc8180x-mdss" }, 236 { .compatible = "qcom,sdm845-mdss" }, 237 { .compatible = "qcom,sdm845-mss-pil" }, 238 { } 239 }; 240 241 static int qcom_smmu_init_context(struct arm_smmu_domain *smmu_domain, 242 struct io_pgtable_cfg *pgtbl_cfg, struct device *dev) 243 { 244 smmu_domain->cfg.flush_walk_prefer_tlbiasid = true; 245 246 return 0; 247 } 248 249 static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu) 250 { 251 unsigned int last_s2cr = ARM_SMMU_GR0_S2CR(smmu->num_mapping_groups - 1); 252 struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); 253 u32 reg; 254 u32 smr; 255 int i; 256 257 /* 258 * With some firmware versions writes to S2CR of type FAULT are 259 * ignored, and writing BYPASS will end up written as FAULT in the 260 * register. Perform a write to S2CR to detect if this is the case and 261 * if so reserve a context bank to emulate bypass streams. 262 */ 263 reg = FIELD_PREP(ARM_SMMU_S2CR_TYPE, S2CR_TYPE_BYPASS) | 264 FIELD_PREP(ARM_SMMU_S2CR_CBNDX, 0xff) | 265 FIELD_PREP(ARM_SMMU_S2CR_PRIVCFG, S2CR_PRIVCFG_DEFAULT); 266 arm_smmu_gr0_write(smmu, last_s2cr, reg); 267 reg = arm_smmu_gr0_read(smmu, last_s2cr); 268 if (FIELD_GET(ARM_SMMU_S2CR_TYPE, reg) != S2CR_TYPE_BYPASS) { 269 qsmmu->bypass_quirk = true; 270 qsmmu->bypass_cbndx = smmu->num_context_banks - 1; 271 272 set_bit(qsmmu->bypass_cbndx, smmu->context_map); 273 274 arm_smmu_cb_write(smmu, qsmmu->bypass_cbndx, ARM_SMMU_CB_SCTLR, 0); 275 276 reg = FIELD_PREP(ARM_SMMU_CBAR_TYPE, CBAR_TYPE_S1_TRANS_S2_BYPASS); 277 arm_smmu_gr1_write(smmu, ARM_SMMU_GR1_CBAR(qsmmu->bypass_cbndx), reg); 278 } 279 280 for (i = 0; i < smmu->num_mapping_groups; i++) { 281 smr = arm_smmu_gr0_read(smmu, ARM_SMMU_GR0_SMR(i)); 282 283 if (FIELD_GET(ARM_SMMU_SMR_VALID, smr)) { 284 /* Ignore valid bit for SMR mask extraction. */ 285 smr &= ~ARM_SMMU_SMR_VALID; 286 smmu->smrs[i].id = FIELD_GET(ARM_SMMU_SMR_ID, smr); 287 smmu->smrs[i].mask = FIELD_GET(ARM_SMMU_SMR_MASK, smr); 288 smmu->smrs[i].valid = true; 289 290 smmu->s2crs[i].type = S2CR_TYPE_BYPASS; 291 smmu->s2crs[i].privcfg = S2CR_PRIVCFG_DEFAULT; 292 smmu->s2crs[i].cbndx = 0xff; 293 } 294 } 295 296 return 0; 297 } 298 299 static void qcom_smmu_write_s2cr(struct arm_smmu_device *smmu, int idx) 300 { 301 struct arm_smmu_s2cr *s2cr = smmu->s2crs + idx; 302 struct qcom_smmu *qsmmu = to_qcom_smmu(smmu); 303 u32 cbndx = s2cr->cbndx; 304 u32 type = s2cr->type; 305 u32 reg; 306 307 if (qsmmu->bypass_quirk) { 308 if (type == S2CR_TYPE_BYPASS) { 309 /* 310 * Firmware with quirky S2CR handling will substitute 311 * BYPASS writes with FAULT, so point the stream to the 312 * reserved context bank and ask for translation on the 313 * stream 314 */ 315 type = S2CR_TYPE_TRANS; 316 cbndx = qsmmu->bypass_cbndx; 317 } else if (type == S2CR_TYPE_FAULT) { 318 /* 319 * Firmware with quirky S2CR handling will ignore FAULT 320 * writes, so trick it to write FAULT by asking for a 321 * BYPASS. 322 */ 323 type = S2CR_TYPE_BYPASS; 324 cbndx = 0xff; 325 } 326 } 327 328 reg = FIELD_PREP(ARM_SMMU_S2CR_TYPE, type) | 329 FIELD_PREP(ARM_SMMU_S2CR_CBNDX, cbndx) | 330 FIELD_PREP(ARM_SMMU_S2CR_PRIVCFG, s2cr->privcfg); 331 arm_smmu_gr0_write(smmu, ARM_SMMU_GR0_S2CR(idx), reg); 332 } 333 334 static int qcom_smmu_def_domain_type(struct device *dev) 335 { 336 const struct of_device_id *match = 337 of_match_device(qcom_smmu_client_of_match, dev); 338 339 return match ? IOMMU_DOMAIN_IDENTITY : 0; 340 } 341 342 static int qcom_sdm845_smmu500_reset(struct arm_smmu_device *smmu) 343 { 344 int ret; 345 346 /* 347 * To address performance degradation in non-real time clients, 348 * such as USB and UFS, turn off wait-for-safe on sdm845 based boards, 349 * such as MTP and db845, whose firmwares implement secure monitor 350 * call handlers to turn on/off the wait-for-safe logic. 351 */ 352 ret = qcom_scm_qsmmu500_wait_safe_toggle(0); 353 if (ret) 354 dev_warn(smmu->dev, "Failed to turn off SAFE logic\n"); 355 356 return ret; 357 } 358 359 static int qcom_smmu500_reset(struct arm_smmu_device *smmu) 360 { 361 const struct device_node *np = smmu->dev->of_node; 362 363 arm_mmu500_reset(smmu); 364 365 if (of_device_is_compatible(np, "qcom,sdm845-smmu-500")) 366 return qcom_sdm845_smmu500_reset(smmu); 367 368 return 0; 369 } 370 371 static const struct arm_smmu_impl qcom_smmu_impl = { 372 .init_context = qcom_smmu_init_context, 373 .cfg_probe = qcom_smmu_cfg_probe, 374 .def_domain_type = qcom_smmu_def_domain_type, 375 .reset = qcom_smmu500_reset, 376 .write_s2cr = qcom_smmu_write_s2cr, 377 }; 378 379 static const struct arm_smmu_impl qcom_adreno_smmu_impl = { 380 .init_context = qcom_adreno_smmu_init_context, 381 .def_domain_type = qcom_smmu_def_domain_type, 382 .reset = qcom_smmu500_reset, 383 .alloc_context_bank = qcom_adreno_smmu_alloc_context_bank, 384 .write_sctlr = qcom_adreno_smmu_write_sctlr, 385 }; 386 387 static struct arm_smmu_device *qcom_smmu_create(struct arm_smmu_device *smmu, 388 const struct arm_smmu_impl *impl) 389 { 390 struct qcom_smmu *qsmmu; 391 392 /* Check to make sure qcom_scm has finished probing */ 393 if (!qcom_scm_is_available()) 394 return ERR_PTR(-EPROBE_DEFER); 395 396 qsmmu = devm_krealloc(smmu->dev, smmu, sizeof(*qsmmu), GFP_KERNEL); 397 if (!qsmmu) 398 return ERR_PTR(-ENOMEM); 399 400 qsmmu->smmu.impl = impl; 401 402 return &qsmmu->smmu; 403 } 404 405 static const struct of_device_id __maybe_unused qcom_smmu_impl_of_match[] = { 406 { .compatible = "qcom,msm8998-smmu-v2" }, 407 { .compatible = "qcom,qcm2290-smmu-500" }, 408 { .compatible = "qcom,sc7180-smmu-500" }, 409 { .compatible = "qcom,sc7280-smmu-500" }, 410 { .compatible = "qcom,sc8180x-smmu-500" }, 411 { .compatible = "qcom,sc8280xp-smmu-500" }, 412 { .compatible = "qcom,sdm630-smmu-v2" }, 413 { .compatible = "qcom,sdm845-smmu-500" }, 414 { .compatible = "qcom,sm6125-smmu-500" }, 415 { .compatible = "qcom,sm6350-smmu-500" }, 416 { .compatible = "qcom,sm8150-smmu-500" }, 417 { .compatible = "qcom,sm8250-smmu-500" }, 418 { .compatible = "qcom,sm8350-smmu-500" }, 419 { .compatible = "qcom,sm8450-smmu-500" }, 420 { } 421 }; 422 423 #ifdef CONFIG_ACPI 424 static struct acpi_platform_list qcom_acpi_platlist[] = { 425 { "LENOVO", "CB-01 ", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" }, 426 { "QCOM ", "QCOMEDK2", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" }, 427 { } 428 }; 429 #endif 430 431 struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu) 432 { 433 const struct device_node *np = smmu->dev->of_node; 434 435 #ifdef CONFIG_ACPI 436 if (np == NULL) { 437 /* Match platform for ACPI boot */ 438 if (acpi_match_platform_list(qcom_acpi_platlist) >= 0) 439 return qcom_smmu_create(smmu, &qcom_smmu_impl); 440 } 441 #endif 442 443 /* 444 * Do not change this order of implementation, i.e., first adreno 445 * smmu impl and then apss smmu since we can have both implementing 446 * arm,mmu-500 in which case we will miss setting adreno smmu specific 447 * features if the order is changed. 448 */ 449 if (of_device_is_compatible(np, "qcom,adreno-smmu")) 450 return qcom_smmu_create(smmu, &qcom_adreno_smmu_impl); 451 452 if (of_match_node(qcom_smmu_impl_of_match, np)) 453 return qcom_smmu_create(smmu, &qcom_smmu_impl); 454 455 return smmu; 456 } 457