1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * AMD Secure Processor device driver 4 * 5 * Copyright (C) 2013,2019 Advanced Micro Devices, Inc. 6 * 7 * Author: Tom Lendacky <thomas.lendacky@amd.com> 8 * Author: Gary R Hook <gary.hook@amd.com> 9 */ 10 11#include <linux/bitfield.h> 12#include <linux/module.h> 13#include <linux/kernel.h> 14#include <linux/device.h> 15#include <linux/pci.h> 16#include <linux/pci_ids.h> 17#include <linux/dma-mapping.h> 18#include <linux/kthread.h> 19#include <linux/sched.h> 20#include <linux/interrupt.h> 21#include <linux/spinlock.h> 22#include <linux/delay.h> 23#include <linux/ccp.h> 24 25#include "ccp-dev.h" 26#include "psp-dev.h" 27 28/* used for version string AA.BB.CC.DD */ 29#define AA GENMASK(31, 24) 30#define BB GENMASK(23, 16) 31#define CC GENMASK(15, 8) 32#define DD GENMASK(7, 0) 33 34#define MSIX_VECTORS 2 35 36struct sp_pci { 37 int msix_count; 38 struct msix_entry msix_entry[MSIX_VECTORS]; 39}; 40static struct sp_device *sp_dev_master; 41 42#define security_attribute_show(name, def) \ 43static ssize_t name##_show(struct device *d, struct device_attribute *attr, \ 44 char *buf) \ 45{ \ 46 struct sp_device *sp = dev_get_drvdata(d); \ 47 struct psp_device *psp = sp->psp_data; \ 48 int bit = PSP_SECURITY_##def << PSP_CAPABILITY_PSP_SECURITY_OFFSET; \ 49 return sysfs_emit(buf, "%d\n", (psp->capability & bit) > 0); \ 50} 51 52security_attribute_show(fused_part, FUSED_PART) 53static DEVICE_ATTR_RO(fused_part); 54security_attribute_show(debug_lock_on, DEBUG_LOCK_ON) 55static DEVICE_ATTR_RO(debug_lock_on); 56security_attribute_show(tsme_status, TSME_STATUS) 57static DEVICE_ATTR_RO(tsme_status); 58security_attribute_show(anti_rollback_status, ANTI_ROLLBACK_STATUS) 59static DEVICE_ATTR_RO(anti_rollback_status); 60security_attribute_show(rpmc_production_enabled, RPMC_PRODUCTION_ENABLED) 61static DEVICE_ATTR_RO(rpmc_production_enabled); 62security_attribute_show(rpmc_spirom_available, RPMC_SPIROM_AVAILABLE) 63static DEVICE_ATTR_RO(rpmc_spirom_available); 64security_attribute_show(hsp_tpm_available, HSP_TPM_AVAILABLE) 65static DEVICE_ATTR_RO(hsp_tpm_available); 66security_attribute_show(rom_armor_enforced, ROM_ARMOR_ENFORCED) 67static DEVICE_ATTR_RO(rom_armor_enforced); 68 69static struct attribute *psp_security_attrs[] = { 70 &dev_attr_fused_part.attr, 71 &dev_attr_debug_lock_on.attr, 72 &dev_attr_tsme_status.attr, 73 &dev_attr_anti_rollback_status.attr, 74 &dev_attr_rpmc_production_enabled.attr, 75 &dev_attr_rpmc_spirom_available.attr, 76 &dev_attr_hsp_tpm_available.attr, 77 &dev_attr_rom_armor_enforced.attr, 78 NULL 79}; 80 81static umode_t psp_security_is_visible(struct kobject *kobj, struct attribute *attr, int idx) 82{ 83 struct device *dev = kobj_to_dev(kobj); 84 struct sp_device *sp = dev_get_drvdata(dev); 85 struct psp_device *psp = sp->psp_data; 86 87 if (psp && PSP_CAPABILITY(psp, PSP_SECURITY_REPORTING)) 88 return 0444; 89 90 return 0; 91} 92 93static struct attribute_group psp_security_attr_group = { 94 .attrs = psp_security_attrs, 95 .is_visible = psp_security_is_visible, 96}; 97 98#define version_attribute_show(name, _offset) \ 99static ssize_t name##_show(struct device *d, struct device_attribute *attr, \ 100 char *buf) \ 101{ \ 102 struct sp_device *sp = dev_get_drvdata(d); \ 103 struct psp_device *psp = sp->psp_data; \ 104 unsigned int val = ioread32(psp->io_regs + _offset); \ 105 return sysfs_emit(buf, "%02lx.%02lx.%02lx.%02lx\n", \ 106 FIELD_GET(AA, val), \ 107 FIELD_GET(BB, val), \ 108 FIELD_GET(CC, val), \ 109 FIELD_GET(DD, val)); \ 110} 111 112version_attribute_show(bootloader_version, psp->vdata->bootloader_info_reg) 113static DEVICE_ATTR_RO(bootloader_version); 114version_attribute_show(tee_version, psp->vdata->tee->info_reg) 115static DEVICE_ATTR_RO(tee_version); 116 117static struct attribute *psp_firmware_attrs[] = { 118 &dev_attr_bootloader_version.attr, 119 &dev_attr_tee_version.attr, 120 NULL, 121}; 122 123static umode_t psp_firmware_is_visible(struct kobject *kobj, struct attribute *attr, int idx) 124{ 125 struct device *dev = kobj_to_dev(kobj); 126 struct sp_device *sp = dev_get_drvdata(dev); 127 struct psp_device *psp = sp->psp_data; 128 unsigned int val = 0xffffffff; 129 130 if (!psp) 131 return 0; 132 133 if (attr == &dev_attr_bootloader_version.attr && 134 psp->vdata->bootloader_info_reg) 135 val = ioread32(psp->io_regs + psp->vdata->bootloader_info_reg); 136 137 if (attr == &dev_attr_tee_version.attr && 138 PSP_CAPABILITY(psp, TEE) && 139 psp->vdata->tee->info_reg) 140 val = ioread32(psp->io_regs + psp->vdata->tee->info_reg); 141 142 /* If platform disallows accessing this register it will be all f's */ 143 if (val != 0xffffffff) 144 return 0444; 145 146 return 0; 147} 148 149static struct attribute_group psp_firmware_attr_group = { 150 .attrs = psp_firmware_attrs, 151 .is_visible = psp_firmware_is_visible, 152}; 153 154static const struct attribute_group *psp_groups[] = { 155 &psp_security_attr_group, 156 &psp_firmware_attr_group, 157 NULL, 158}; 159 160static int sp_get_msix_irqs(struct sp_device *sp) 161{ 162 struct sp_pci *sp_pci = sp->dev_specific; 163 struct device *dev = sp->dev; 164 struct pci_dev *pdev = to_pci_dev(dev); 165 int v, ret; 166 167 for (v = 0; v < ARRAY_SIZE(sp_pci->msix_entry); v++) 168 sp_pci->msix_entry[v].entry = v; 169 170 ret = pci_enable_msix_range(pdev, sp_pci->msix_entry, 1, v); 171 if (ret < 0) 172 return ret; 173 174 sp_pci->msix_count = ret; 175 sp->use_tasklet = true; 176 177 sp->psp_irq = sp_pci->msix_entry[0].vector; 178 sp->ccp_irq = (sp_pci->msix_count > 1) ? sp_pci->msix_entry[1].vector 179 : sp_pci->msix_entry[0].vector; 180 return 0; 181} 182 183static int sp_get_msi_irq(struct sp_device *sp) 184{ 185 struct device *dev = sp->dev; 186 struct pci_dev *pdev = to_pci_dev(dev); 187 int ret; 188 189 ret = pci_enable_msi(pdev); 190 if (ret) 191 return ret; 192 193 sp->ccp_irq = pdev->irq; 194 sp->psp_irq = pdev->irq; 195 196 return 0; 197} 198 199static int sp_get_irqs(struct sp_device *sp) 200{ 201 struct device *dev = sp->dev; 202 int ret; 203 204 ret = sp_get_msix_irqs(sp); 205 if (!ret) 206 return 0; 207 208 /* Couldn't get MSI-X vectors, try MSI */ 209 dev_notice(dev, "could not enable MSI-X (%d), trying MSI\n", ret); 210 ret = sp_get_msi_irq(sp); 211 if (!ret) 212 return 0; 213 214 /* Couldn't get MSI interrupt */ 215 dev_notice(dev, "could not enable MSI (%d)\n", ret); 216 217 return ret; 218} 219 220static void sp_free_irqs(struct sp_device *sp) 221{ 222 struct sp_pci *sp_pci = sp->dev_specific; 223 struct device *dev = sp->dev; 224 struct pci_dev *pdev = to_pci_dev(dev); 225 226 if (sp_pci->msix_count) 227 pci_disable_msix(pdev); 228 else if (sp->psp_irq) 229 pci_disable_msi(pdev); 230 231 sp->ccp_irq = 0; 232 sp->psp_irq = 0; 233} 234 235static bool sp_pci_is_master(struct sp_device *sp) 236{ 237 struct device *dev_cur, *dev_new; 238 struct pci_dev *pdev_cur, *pdev_new; 239 240 dev_new = sp->dev; 241 dev_cur = sp_dev_master->dev; 242 243 pdev_new = to_pci_dev(dev_new); 244 pdev_cur = to_pci_dev(dev_cur); 245 246 if (pdev_new->bus->number < pdev_cur->bus->number) 247 return true; 248 249 if (PCI_SLOT(pdev_new->devfn) < PCI_SLOT(pdev_cur->devfn)) 250 return true; 251 252 if (PCI_FUNC(pdev_new->devfn) < PCI_FUNC(pdev_cur->devfn)) 253 return true; 254 255 return false; 256} 257 258static void psp_set_master(struct sp_device *sp) 259{ 260 if (!sp_dev_master) { 261 sp_dev_master = sp; 262 return; 263 } 264 265 if (sp_pci_is_master(sp)) 266 sp_dev_master = sp; 267} 268 269static struct sp_device *psp_get_master(void) 270{ 271 return sp_dev_master; 272} 273 274static void psp_clear_master(struct sp_device *sp) 275{ 276 if (sp == sp_dev_master) { 277 sp_dev_master = NULL; 278 dev_dbg(sp->dev, "Cleared sp_dev_master\n"); 279 } 280} 281 282static int sp_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) 283{ 284 struct sp_device *sp; 285 struct sp_pci *sp_pci; 286 struct device *dev = &pdev->dev; 287 void __iomem * const *iomap_table; 288 int bar_mask; 289 int ret; 290 291 ret = -ENOMEM; 292 sp = sp_alloc_struct(dev); 293 if (!sp) 294 goto e_err; 295 296 sp_pci = devm_kzalloc(dev, sizeof(*sp_pci), GFP_KERNEL); 297 if (!sp_pci) 298 goto e_err; 299 300 sp->dev_specific = sp_pci; 301 sp->dev_vdata = (struct sp_dev_vdata *)id->driver_data; 302 if (!sp->dev_vdata) { 303 ret = -ENODEV; 304 dev_err(dev, "missing driver data\n"); 305 goto e_err; 306 } 307 308 ret = pcim_enable_device(pdev); 309 if (ret) { 310 dev_err(dev, "pcim_enable_device failed (%d)\n", ret); 311 goto e_err; 312 } 313 314 bar_mask = pci_select_bars(pdev, IORESOURCE_MEM); 315 ret = pcim_iomap_regions(pdev, bar_mask, "ccp"); 316 if (ret) { 317 dev_err(dev, "pcim_iomap_regions failed (%d)\n", ret); 318 goto e_err; 319 } 320 321 iomap_table = pcim_iomap_table(pdev); 322 if (!iomap_table) { 323 dev_err(dev, "pcim_iomap_table failed\n"); 324 ret = -ENOMEM; 325 goto e_err; 326 } 327 328 sp->io_map = iomap_table[sp->dev_vdata->bar]; 329 if (!sp->io_map) { 330 dev_err(dev, "ioremap failed\n"); 331 ret = -ENOMEM; 332 goto e_err; 333 } 334 335 ret = sp_get_irqs(sp); 336 if (ret) 337 goto e_err; 338 339 pci_set_master(pdev); 340 sp->set_psp_master_device = psp_set_master; 341 sp->get_psp_master_device = psp_get_master; 342 sp->clear_psp_master_device = psp_clear_master; 343 344 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(48)); 345 if (ret) { 346 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); 347 if (ret) { 348 dev_err(dev, "dma_set_mask_and_coherent failed (%d)\n", 349 ret); 350 goto free_irqs; 351 } 352 } 353 354 dev_set_drvdata(dev, sp); 355 356 ret = sp_init(sp); 357 if (ret) 358 goto free_irqs; 359 360 return 0; 361 362free_irqs: 363 sp_free_irqs(sp); 364e_err: 365 dev_notice(dev, "initialization failed\n"); 366 return ret; 367} 368 369static void sp_pci_shutdown(struct pci_dev *pdev) 370{ 371 struct device *dev = &pdev->dev; 372 struct sp_device *sp = dev_get_drvdata(dev); 373 374 if (!sp) 375 return; 376 377 sp_destroy(sp); 378} 379 380static void sp_pci_remove(struct pci_dev *pdev) 381{ 382 struct device *dev = &pdev->dev; 383 struct sp_device *sp = dev_get_drvdata(dev); 384 385 if (!sp) 386 return; 387 388 sp_destroy(sp); 389 390 sp_free_irqs(sp); 391} 392 393static int __maybe_unused sp_pci_suspend(struct device *dev) 394{ 395 struct sp_device *sp = dev_get_drvdata(dev); 396 397 return sp_suspend(sp); 398} 399 400static int __maybe_unused sp_pci_resume(struct device *dev) 401{ 402 struct sp_device *sp = dev_get_drvdata(dev); 403 404 return sp_resume(sp); 405} 406 407#ifdef CONFIG_CRYPTO_DEV_SP_PSP 408static const struct sev_vdata sevv1 = { 409 .cmdresp_reg = 0x10580, /* C2PMSG_32 */ 410 .cmdbuff_addr_lo_reg = 0x105e0, /* C2PMSG_56 */ 411 .cmdbuff_addr_hi_reg = 0x105e4, /* C2PMSG_57 */ 412}; 413 414static const struct sev_vdata sevv2 = { 415 .cmdresp_reg = 0x10980, /* C2PMSG_32 */ 416 .cmdbuff_addr_lo_reg = 0x109e0, /* C2PMSG_56 */ 417 .cmdbuff_addr_hi_reg = 0x109e4, /* C2PMSG_57 */ 418}; 419 420static const struct tee_vdata teev1 = { 421 .ring_wptr_reg = 0x10550, /* C2PMSG_20 */ 422 .ring_rptr_reg = 0x10554, /* C2PMSG_21 */ 423 .info_reg = 0x109e8, /* C2PMSG_58 */ 424}; 425 426static const struct tee_vdata teev2 = { 427 .ring_wptr_reg = 0x10950, /* C2PMSG_20 */ 428 .ring_rptr_reg = 0x10954, /* C2PMSG_21 */ 429}; 430 431static const struct platform_access_vdata pa_v1 = { 432 .cmdresp_reg = 0x10570, /* C2PMSG_28 */ 433 .cmdbuff_addr_lo_reg = 0x10574, /* C2PMSG_29 */ 434 .cmdbuff_addr_hi_reg = 0x10578, /* C2PMSG_30 */ 435 .doorbell_button_reg = 0x10a24, /* C2PMSG_73 */ 436 .doorbell_cmd_reg = 0x10a40, /* C2PMSG_80 */ 437}; 438 439static const struct platform_access_vdata pa_v2 = { 440 .doorbell_button_reg = 0x10a24, /* C2PMSG_73 */ 441 .doorbell_cmd_reg = 0x10a40, /* C2PMSG_80 */ 442}; 443 444static const struct psp_vdata pspv1 = { 445 .sev = &sevv1, 446 .bootloader_info_reg = 0x105ec, /* C2PMSG_59 */ 447 .feature_reg = 0x105fc, /* C2PMSG_63 */ 448 .inten_reg = 0x10610, /* P2CMSG_INTEN */ 449 .intsts_reg = 0x10614, /* P2CMSG_INTSTS */ 450}; 451 452static const struct psp_vdata pspv2 = { 453 .sev = &sevv2, 454 .bootloader_info_reg = 0x109ec, /* C2PMSG_59 */ 455 .feature_reg = 0x109fc, /* C2PMSG_63 */ 456 .inten_reg = 0x10690, /* P2CMSG_INTEN */ 457 .intsts_reg = 0x10694, /* P2CMSG_INTSTS */ 458}; 459 460static const struct psp_vdata pspv3 = { 461 .tee = &teev1, 462 .platform_access = &pa_v1, 463 .cmdresp_reg = 0x10544, /* C2PMSG_17 */ 464 .cmdbuff_addr_lo_reg = 0x10548, /* C2PMSG_18 */ 465 .cmdbuff_addr_hi_reg = 0x1054c, /* C2PMSG_19 */ 466 .bootloader_info_reg = 0x109ec, /* C2PMSG_59 */ 467 .feature_reg = 0x109fc, /* C2PMSG_63 */ 468 .inten_reg = 0x10690, /* P2CMSG_INTEN */ 469 .intsts_reg = 0x10694, /* P2CMSG_INTSTS */ 470 .platform_features = PLATFORM_FEATURE_DBC, 471}; 472 473static const struct psp_vdata pspv4 = { 474 .sev = &sevv2, 475 .tee = &teev1, 476 .cmdresp_reg = 0x10544, /* C2PMSG_17 */ 477 .cmdbuff_addr_lo_reg = 0x10548, /* C2PMSG_18 */ 478 .cmdbuff_addr_hi_reg = 0x1054c, /* C2PMSG_19 */ 479 .bootloader_info_reg = 0x109ec, /* C2PMSG_59 */ 480 .feature_reg = 0x109fc, /* C2PMSG_63 */ 481 .inten_reg = 0x10690, /* P2CMSG_INTEN */ 482 .intsts_reg = 0x10694, /* P2CMSG_INTSTS */ 483}; 484 485static const struct psp_vdata pspv5 = { 486 .tee = &teev2, 487 .platform_access = &pa_v2, 488 .cmdresp_reg = 0x10944, /* C2PMSG_17 */ 489 .cmdbuff_addr_lo_reg = 0x10948, /* C2PMSG_18 */ 490 .cmdbuff_addr_hi_reg = 0x1094c, /* C2PMSG_19 */ 491 .feature_reg = 0x109fc, /* C2PMSG_63 */ 492 .inten_reg = 0x10510, /* P2CMSG_INTEN */ 493 .intsts_reg = 0x10514, /* P2CMSG_INTSTS */ 494}; 495 496static const struct psp_vdata pspv6 = { 497 .sev = &sevv2, 498 .tee = &teev2, 499 .cmdresp_reg = 0x10944, /* C2PMSG_17 */ 500 .cmdbuff_addr_lo_reg = 0x10948, /* C2PMSG_18 */ 501 .cmdbuff_addr_hi_reg = 0x1094c, /* C2PMSG_19 */ 502 .feature_reg = 0x109fc, /* C2PMSG_63 */ 503 .inten_reg = 0x10510, /* P2CMSG_INTEN */ 504 .intsts_reg = 0x10514, /* P2CMSG_INTSTS */ 505}; 506 507#endif 508 509static const struct sp_dev_vdata dev_vdata[] = { 510 { /* 0 */ 511 .bar = 2, 512#ifdef CONFIG_CRYPTO_DEV_SP_CCP 513 .ccp_vdata = &ccpv3, 514#endif 515 }, 516 { /* 1 */ 517 .bar = 2, 518#ifdef CONFIG_CRYPTO_DEV_SP_CCP 519 .ccp_vdata = &ccpv5a, 520#endif 521#ifdef CONFIG_CRYPTO_DEV_SP_PSP 522 .psp_vdata = &pspv1, 523#endif 524 }, 525 { /* 2 */ 526 .bar = 2, 527#ifdef CONFIG_CRYPTO_DEV_SP_CCP 528 .ccp_vdata = &ccpv5b, 529#endif 530 }, 531 { /* 3 */ 532 .bar = 2, 533#ifdef CONFIG_CRYPTO_DEV_SP_CCP 534 .ccp_vdata = &ccpv5a, 535#endif 536#ifdef CONFIG_CRYPTO_DEV_SP_PSP 537 .psp_vdata = &pspv2, 538#endif 539 }, 540 { /* 4 */ 541 .bar = 2, 542#ifdef CONFIG_CRYPTO_DEV_SP_CCP 543 .ccp_vdata = &ccpv5a, 544#endif 545#ifdef CONFIG_CRYPTO_DEV_SP_PSP 546 .psp_vdata = &pspv3, 547#endif 548 }, 549 { /* 5 */ 550 .bar = 2, 551#ifdef CONFIG_CRYPTO_DEV_SP_PSP 552 .psp_vdata = &pspv4, 553#endif 554 }, 555 { /* 6 */ 556 .bar = 2, 557#ifdef CONFIG_CRYPTO_DEV_SP_PSP 558 .psp_vdata = &pspv3, 559#endif 560 }, 561 { /* 7 */ 562 .bar = 2, 563#ifdef CONFIG_CRYPTO_DEV_SP_PSP 564 .psp_vdata = &pspv5, 565#endif 566 }, 567 { /* 8 */ 568 .bar = 2, 569#ifdef CONFIG_CRYPTO_DEV_SP_PSP 570 .psp_vdata = &pspv6, 571#endif 572 }, 573}; 574static const struct pci_device_id sp_pci_table[] = { 575 { PCI_VDEVICE(AMD, 0x1537), (kernel_ulong_t)&dev_vdata[0] }, 576 { PCI_VDEVICE(AMD, 0x1456), (kernel_ulong_t)&dev_vdata[1] }, 577 { PCI_VDEVICE(AMD, 0x1468), (kernel_ulong_t)&dev_vdata[2] }, 578 { PCI_VDEVICE(AMD, 0x1486), (kernel_ulong_t)&dev_vdata[3] }, 579 { PCI_VDEVICE(AMD, 0x15DF), (kernel_ulong_t)&dev_vdata[4] }, 580 { PCI_VDEVICE(AMD, 0x14CA), (kernel_ulong_t)&dev_vdata[5] }, 581 { PCI_VDEVICE(AMD, 0x15C7), (kernel_ulong_t)&dev_vdata[6] }, 582 { PCI_VDEVICE(AMD, 0x1649), (kernel_ulong_t)&dev_vdata[6] }, 583 { PCI_VDEVICE(AMD, 0x17E0), (kernel_ulong_t)&dev_vdata[7] }, 584 { PCI_VDEVICE(AMD, 0x156E), (kernel_ulong_t)&dev_vdata[8] }, 585 /* Last entry must be zero */ 586 { 0, } 587}; 588MODULE_DEVICE_TABLE(pci, sp_pci_table); 589 590static SIMPLE_DEV_PM_OPS(sp_pci_pm_ops, sp_pci_suspend, sp_pci_resume); 591 592static struct pci_driver sp_pci_driver = { 593 .name = "ccp", 594 .id_table = sp_pci_table, 595 .probe = sp_pci_probe, 596 .remove = sp_pci_remove, 597 .shutdown = sp_pci_shutdown, 598 .driver.pm = &sp_pci_pm_ops, 599 .dev_groups = psp_groups, 600}; 601 602int sp_pci_init(void) 603{ 604 return pci_register_driver(&sp_pci_driver); 605} 606 607void sp_pci_exit(void) 608{ 609 pci_unregister_driver(&sp_pci_driver); 610} 611