1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2012 4 * 5 * Author(s): 6 * Jan Glauber <jang@linux.vnet.ibm.com> 7 */ 8 9 #define KMSG_COMPONENT "zpci" 10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 11 12 #include <linux/compat.h> 13 #include <linux/kernel.h> 14 #include <linux/miscdevice.h> 15 #include <linux/slab.h> 16 #include <linux/err.h> 17 #include <linux/delay.h> 18 #include <linux/pci.h> 19 #include <linux/uaccess.h> 20 #include <asm/pci_debug.h> 21 #include <asm/pci_clp.h> 22 #include <asm/clp.h> 23 #include <uapi/asm/clp.h> 24 25 bool zpci_unique_uid; 26 27 static void update_uid_checking(bool new) 28 { 29 if (zpci_unique_uid != new) 30 zpci_dbg(1, "uid checking:%d\n", new); 31 32 zpci_unique_uid = new; 33 } 34 35 static inline void zpci_err_clp(unsigned int rsp, int rc) 36 { 37 struct { 38 unsigned int rsp; 39 int rc; 40 } __packed data = {rsp, rc}; 41 42 zpci_err_hex(&data, sizeof(data)); 43 } 44 45 /* 46 * Call Logical Processor with c=1, lps=0 and command 1 47 * to get the bit mask of installed logical processors 48 */ 49 static inline int clp_get_ilp(unsigned long *ilp) 50 { 51 unsigned long mask; 52 int cc = 3; 53 54 asm volatile ( 55 " .insn rrf,0xb9a00000,%[mask],%[cmd],8,0\n" 56 "0: ipm %[cc]\n" 57 " srl %[cc],28\n" 58 "1:\n" 59 EX_TABLE(0b, 1b) 60 : [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1) 61 : "cc"); 62 *ilp = mask; 63 return cc; 64 } 65 66 /* 67 * Call Logical Processor with c=0, the give constant lps and an lpcb request. 68 */ 69 static inline int clp_req(void *data, unsigned int lps) 70 { 71 struct { u8 _[CLP_BLK_SIZE]; } *req = data; 72 u64 ignored; 73 int cc = 3; 74 75 asm volatile ( 76 " .insn rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n" 77 "0: ipm %[cc]\n" 78 " srl %[cc],28\n" 79 "1:\n" 80 EX_TABLE(0b, 1b) 81 : [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req) 82 : [req] "a" (req), [lps] "i" (lps) 83 : "cc"); 84 return cc; 85 } 86 87 static void *clp_alloc_block(gfp_t gfp_mask) 88 { 89 return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE)); 90 } 91 92 static void clp_free_block(void *ptr) 93 { 94 free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE)); 95 } 96 97 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev, 98 struct clp_rsp_query_pci_grp *response) 99 { 100 zdev->tlb_refresh = response->refresh; 101 zdev->dma_mask = response->dasm; 102 zdev->msi_addr = response->msia; 103 zdev->max_msi = response->noi; 104 zdev->fmb_update = response->mui; 105 106 switch (response->version) { 107 case 1: 108 zdev->max_bus_speed = PCIE_SPEED_5_0GT; 109 break; 110 default: 111 zdev->max_bus_speed = PCI_SPEED_UNKNOWN; 112 break; 113 } 114 } 115 116 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid) 117 { 118 struct clp_req_rsp_query_pci_grp *rrb; 119 int rc; 120 121 rrb = clp_alloc_block(GFP_KERNEL); 122 if (!rrb) 123 return -ENOMEM; 124 125 memset(rrb, 0, sizeof(*rrb)); 126 rrb->request.hdr.len = sizeof(rrb->request); 127 rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP; 128 rrb->response.hdr.len = sizeof(rrb->response); 129 rrb->request.pfgid = pfgid; 130 131 rc = clp_req(rrb, CLP_LPS_PCI); 132 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) 133 clp_store_query_pci_fngrp(zdev, &rrb->response); 134 else { 135 zpci_err("Q PCI FGRP:\n"); 136 zpci_err_clp(rrb->response.hdr.rsp, rc); 137 rc = -EIO; 138 } 139 clp_free_block(rrb); 140 return rc; 141 } 142 143 static int clp_store_query_pci_fn(struct zpci_dev *zdev, 144 struct clp_rsp_query_pci *response) 145 { 146 int i; 147 148 for (i = 0; i < PCI_BAR_COUNT; i++) { 149 zdev->bars[i].val = le32_to_cpu(response->bar[i]); 150 zdev->bars[i].size = response->bar_size[i]; 151 } 152 zdev->start_dma = response->sdma; 153 zdev->end_dma = response->edma; 154 zdev->pchid = response->pchid; 155 zdev->pfgid = response->pfgid; 156 zdev->pft = response->pft; 157 zdev->vfn = response->vfn; 158 zdev->uid = response->uid; 159 zdev->fmb_length = sizeof(u32) * response->fmb_len; 160 161 memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip)); 162 if (response->util_str_avail) { 163 memcpy(zdev->util_str, response->util_str, 164 sizeof(zdev->util_str)); 165 } 166 zdev->mio_capable = response->mio_addr_avail; 167 for (i = 0; i < PCI_BAR_COUNT; i++) { 168 if (!(response->mio.valid & (1 << (PCI_BAR_COUNT - i - 1)))) 169 continue; 170 171 zdev->bars[i].mio_wb = (void __iomem *) response->mio.addr[i].wb; 172 zdev->bars[i].mio_wt = (void __iomem *) response->mio.addr[i].wt; 173 } 174 return 0; 175 } 176 177 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh) 178 { 179 struct clp_req_rsp_query_pci *rrb; 180 int rc; 181 182 rrb = clp_alloc_block(GFP_KERNEL); 183 if (!rrb) 184 return -ENOMEM; 185 186 memset(rrb, 0, sizeof(*rrb)); 187 rrb->request.hdr.len = sizeof(rrb->request); 188 rrb->request.hdr.cmd = CLP_QUERY_PCI_FN; 189 rrb->response.hdr.len = sizeof(rrb->response); 190 rrb->request.fh = fh; 191 192 rc = clp_req(rrb, CLP_LPS_PCI); 193 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) { 194 rc = clp_store_query_pci_fn(zdev, &rrb->response); 195 if (rc) 196 goto out; 197 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid); 198 } else { 199 zpci_err("Q PCI FN:\n"); 200 zpci_err_clp(rrb->response.hdr.rsp, rc); 201 rc = -EIO; 202 } 203 out: 204 clp_free_block(rrb); 205 return rc; 206 } 207 208 int clp_add_pci_device(u32 fid, u32 fh, int configured) 209 { 210 struct zpci_dev *zdev; 211 int rc = -ENOMEM; 212 213 zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured); 214 zdev = kzalloc(sizeof(*zdev), GFP_KERNEL); 215 if (!zdev) 216 goto error; 217 218 zdev->fh = fh; 219 zdev->fid = fid; 220 221 /* Query function properties and update zdev */ 222 rc = clp_query_pci_fn(zdev, fh); 223 if (rc) 224 goto error; 225 226 if (configured) 227 zdev->state = ZPCI_FN_STATE_CONFIGURED; 228 else 229 zdev->state = ZPCI_FN_STATE_STANDBY; 230 231 rc = zpci_create_device(zdev); 232 if (rc) 233 goto error; 234 return 0; 235 236 error: 237 zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc); 238 kfree(zdev); 239 return rc; 240 } 241 242 /* 243 * Enable/Disable a given PCI function defined by its function handle. 244 */ 245 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command) 246 { 247 struct clp_req_rsp_set_pci *rrb; 248 int rc, retries = 100; 249 250 rrb = clp_alloc_block(GFP_KERNEL); 251 if (!rrb) 252 return -ENOMEM; 253 254 do { 255 memset(rrb, 0, sizeof(*rrb)); 256 rrb->request.hdr.len = sizeof(rrb->request); 257 rrb->request.hdr.cmd = CLP_SET_PCI_FN; 258 rrb->response.hdr.len = sizeof(rrb->response); 259 rrb->request.fh = *fh; 260 rrb->request.oc = command; 261 rrb->request.ndas = nr_dma_as; 262 263 rc = clp_req(rrb, CLP_LPS_PCI); 264 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) { 265 retries--; 266 if (retries < 0) 267 break; 268 msleep(20); 269 } 270 } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY); 271 272 if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) 273 *fh = rrb->response.fh; 274 else { 275 zpci_err("Set PCI FN:\n"); 276 zpci_err_clp(rrb->response.hdr.rsp, rc); 277 rc = -EIO; 278 } 279 clp_free_block(rrb); 280 return rc; 281 } 282 283 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as) 284 { 285 u32 fh = zdev->fh; 286 int rc; 287 288 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN); 289 zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc); 290 if (rc) 291 goto out; 292 293 zdev->fh = fh; 294 if (zpci_use_mio(zdev)) { 295 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_MIO); 296 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc); 297 if (rc) 298 clp_disable_fh(zdev); 299 } 300 out: 301 return rc; 302 } 303 304 int clp_disable_fh(struct zpci_dev *zdev) 305 { 306 u32 fh = zdev->fh; 307 int rc; 308 309 if (!zdev_enabled(zdev)) 310 return 0; 311 312 rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN); 313 zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc); 314 if (!rc) 315 zdev->fh = fh; 316 317 return rc; 318 } 319 320 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data, 321 void (*cb)(struct clp_fh_list_entry *, void *)) 322 { 323 u64 resume_token = 0; 324 int entries, i, rc; 325 326 do { 327 memset(rrb, 0, sizeof(*rrb)); 328 rrb->request.hdr.len = sizeof(rrb->request); 329 rrb->request.hdr.cmd = CLP_LIST_PCI; 330 /* store as many entries as possible */ 331 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN; 332 rrb->request.resume_token = resume_token; 333 334 /* Get PCI function handle list */ 335 rc = clp_req(rrb, CLP_LPS_PCI); 336 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) { 337 zpci_err("List PCI FN:\n"); 338 zpci_err_clp(rrb->response.hdr.rsp, rc); 339 rc = -EIO; 340 goto out; 341 } 342 343 update_uid_checking(rrb->response.uid_checking); 344 WARN_ON_ONCE(rrb->response.entry_size != 345 sizeof(struct clp_fh_list_entry)); 346 347 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) / 348 rrb->response.entry_size; 349 350 resume_token = rrb->response.resume_token; 351 for (i = 0; i < entries; i++) 352 cb(&rrb->response.fh_list[i], data); 353 } while (resume_token); 354 out: 355 return rc; 356 } 357 358 static void __clp_add(struct clp_fh_list_entry *entry, void *data) 359 { 360 struct zpci_dev *zdev; 361 362 if (!entry->vendor_id) 363 return; 364 365 zdev = get_zdev_by_fid(entry->fid); 366 if (!zdev) 367 clp_add_pci_device(entry->fid, entry->fh, entry->config_state); 368 } 369 370 static void __clp_update(struct clp_fh_list_entry *entry, void *data) 371 { 372 struct zpci_dev *zdev; 373 374 if (!entry->vendor_id) 375 return; 376 377 zdev = get_zdev_by_fid(entry->fid); 378 if (!zdev) 379 return; 380 381 zdev->fh = entry->fh; 382 } 383 384 int clp_scan_pci_devices(void) 385 { 386 struct clp_req_rsp_list_pci *rrb; 387 int rc; 388 389 rrb = clp_alloc_block(GFP_KERNEL); 390 if (!rrb) 391 return -ENOMEM; 392 393 rc = clp_list_pci(rrb, NULL, __clp_add); 394 395 clp_free_block(rrb); 396 return rc; 397 } 398 399 int clp_rescan_pci_devices(void) 400 { 401 struct clp_req_rsp_list_pci *rrb; 402 int rc; 403 404 zpci_remove_reserved_devices(); 405 406 rrb = clp_alloc_block(GFP_KERNEL); 407 if (!rrb) 408 return -ENOMEM; 409 410 rc = clp_list_pci(rrb, NULL, __clp_add); 411 412 clp_free_block(rrb); 413 return rc; 414 } 415 416 int clp_rescan_pci_devices_simple(void) 417 { 418 struct clp_req_rsp_list_pci *rrb; 419 int rc; 420 421 rrb = clp_alloc_block(GFP_NOWAIT); 422 if (!rrb) 423 return -ENOMEM; 424 425 rc = clp_list_pci(rrb, NULL, __clp_update); 426 427 clp_free_block(rrb); 428 return rc; 429 } 430 431 struct clp_state_data { 432 u32 fid; 433 enum zpci_state state; 434 }; 435 436 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data) 437 { 438 struct clp_state_data *sd = data; 439 440 if (entry->fid != sd->fid) 441 return; 442 443 sd->state = entry->config_state; 444 } 445 446 int clp_get_state(u32 fid, enum zpci_state *state) 447 { 448 struct clp_req_rsp_list_pci *rrb; 449 struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED}; 450 int rc; 451 452 rrb = clp_alloc_block(GFP_ATOMIC); 453 if (!rrb) 454 return -ENOMEM; 455 456 rc = clp_list_pci(rrb, &sd, __clp_get_state); 457 if (!rc) 458 *state = sd.state; 459 460 clp_free_block(rrb); 461 return rc; 462 } 463 464 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb) 465 { 466 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request); 467 468 if (lpcb->request.hdr.len != sizeof(lpcb->request) || 469 lpcb->response.hdr.len > limit) 470 return -EINVAL; 471 return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0; 472 } 473 474 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb) 475 { 476 switch (lpcb->cmd) { 477 case 0x0001: /* store logical-processor characteristics */ 478 return clp_base_slpc(req, (void *) lpcb); 479 default: 480 return -EINVAL; 481 } 482 } 483 484 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb) 485 { 486 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request); 487 488 if (lpcb->request.hdr.len != sizeof(lpcb->request) || 489 lpcb->response.hdr.len > limit) 490 return -EINVAL; 491 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0; 492 } 493 494 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb) 495 { 496 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request); 497 498 if (lpcb->request.hdr.len != sizeof(lpcb->request) || 499 lpcb->response.hdr.len > limit) 500 return -EINVAL; 501 if (lpcb->request.reserved2 != 0) 502 return -EINVAL; 503 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0; 504 } 505 506 static int clp_pci_query(struct clp_req *req, 507 struct clp_req_rsp_query_pci *lpcb) 508 { 509 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request); 510 511 if (lpcb->request.hdr.len != sizeof(lpcb->request) || 512 lpcb->response.hdr.len > limit) 513 return -EINVAL; 514 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0) 515 return -EINVAL; 516 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0; 517 } 518 519 static int clp_pci_query_grp(struct clp_req *req, 520 struct clp_req_rsp_query_pci_grp *lpcb) 521 { 522 unsigned long limit = PAGE_SIZE - sizeof(lpcb->request); 523 524 if (lpcb->request.hdr.len != sizeof(lpcb->request) || 525 lpcb->response.hdr.len > limit) 526 return -EINVAL; 527 if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 || 528 lpcb->request.reserved4 != 0) 529 return -EINVAL; 530 return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0; 531 } 532 533 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb) 534 { 535 switch (lpcb->cmd) { 536 case 0x0001: /* store logical-processor characteristics */ 537 return clp_pci_slpc(req, (void *) lpcb); 538 case 0x0002: /* list PCI functions */ 539 return clp_pci_list(req, (void *) lpcb); 540 case 0x0003: /* query PCI function */ 541 return clp_pci_query(req, (void *) lpcb); 542 case 0x0004: /* query PCI function group */ 543 return clp_pci_query_grp(req, (void *) lpcb); 544 default: 545 return -EINVAL; 546 } 547 } 548 549 static int clp_normal_command(struct clp_req *req) 550 { 551 struct clp_req_hdr *lpcb; 552 void __user *uptr; 553 int rc; 554 555 rc = -EINVAL; 556 if (req->lps != 0 && req->lps != 2) 557 goto out; 558 559 rc = -ENOMEM; 560 lpcb = clp_alloc_block(GFP_KERNEL); 561 if (!lpcb) 562 goto out; 563 564 rc = -EFAULT; 565 uptr = (void __force __user *)(unsigned long) req->data_p; 566 if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0) 567 goto out_free; 568 569 rc = -EINVAL; 570 if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0) 571 goto out_free; 572 573 switch (req->lps) { 574 case 0: 575 rc = clp_base_command(req, lpcb); 576 break; 577 case 2: 578 rc = clp_pci_command(req, lpcb); 579 break; 580 } 581 if (rc) 582 goto out_free; 583 584 rc = -EFAULT; 585 if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0) 586 goto out_free; 587 588 rc = 0; 589 590 out_free: 591 clp_free_block(lpcb); 592 out: 593 return rc; 594 } 595 596 static int clp_immediate_command(struct clp_req *req) 597 { 598 void __user *uptr; 599 unsigned long ilp; 600 int exists; 601 602 if (req->cmd > 1 || clp_get_ilp(&ilp) != 0) 603 return -EINVAL; 604 605 uptr = (void __force __user *)(unsigned long) req->data_p; 606 if (req->cmd == 0) { 607 /* Command code 0: test for a specific processor */ 608 exists = test_bit_inv(req->lps, &ilp); 609 return put_user(exists, (int __user *) uptr); 610 } 611 /* Command code 1: return bit mask of installed processors */ 612 return put_user(ilp, (unsigned long __user *) uptr); 613 } 614 615 static long clp_misc_ioctl(struct file *filp, unsigned int cmd, 616 unsigned long arg) 617 { 618 struct clp_req req; 619 void __user *argp; 620 621 if (cmd != CLP_SYNC) 622 return -EINVAL; 623 624 argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg; 625 if (copy_from_user(&req, argp, sizeof(req))) 626 return -EFAULT; 627 if (req.r != 0) 628 return -EINVAL; 629 return req.c ? clp_immediate_command(&req) : clp_normal_command(&req); 630 } 631 632 static int clp_misc_release(struct inode *inode, struct file *filp) 633 { 634 return 0; 635 } 636 637 static const struct file_operations clp_misc_fops = { 638 .owner = THIS_MODULE, 639 .open = nonseekable_open, 640 .release = clp_misc_release, 641 .unlocked_ioctl = clp_misc_ioctl, 642 .compat_ioctl = clp_misc_ioctl, 643 .llseek = no_llseek, 644 }; 645 646 static struct miscdevice clp_misc_device = { 647 .minor = MISC_DYNAMIC_MINOR, 648 .name = "clp", 649 .fops = &clp_misc_fops, 650 }; 651 652 static int __init clp_misc_init(void) 653 { 654 return misc_register(&clp_misc_device); 655 } 656 657 device_initcall(clp_misc_init); 658