1// SPDX-License-Identifier: GPL-2.0 2/* 3 * ISM driver for s390. 4 * 5 * Copyright IBM Corp. 2018 6 */ 7#define KMSG_COMPONENT "ism" 8#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 9 10#include <linux/module.h> 11#include <linux/types.h> 12#include <linux/interrupt.h> 13#include <linux/device.h> 14#include <linux/pci.h> 15#include <linux/err.h> 16#include <linux/ctype.h> 17#include <linux/processor.h> 18#include <net/smc.h> 19 20#include <asm/debug.h> 21 22#include "ism.h" 23 24MODULE_DESCRIPTION("ISM driver for s390"); 25MODULE_LICENSE("GPL"); 26 27#define PCI_DEVICE_ID_IBM_ISM 0x04ED 28#define DRV_NAME "ism" 29 30static const struct pci_device_id ism_device_table[] = { 31 { PCI_VDEVICE(IBM, PCI_DEVICE_ID_IBM_ISM), 0 }, 32 { 0, } 33}; 34MODULE_DEVICE_TABLE(pci, ism_device_table); 35 36static debug_info_t *ism_debug_info; 37 38static int ism_cmd(struct ism_dev *ism, void *cmd) 39{ 40 struct ism_req_hdr *req = cmd; 41 struct ism_resp_hdr *resp = cmd; 42 43 __ism_write_cmd(ism, req + 1, sizeof(*req), req->len - sizeof(*req)); 44 __ism_write_cmd(ism, req, 0, sizeof(*req)); 45 46 WRITE_ONCE(resp->ret, ISM_ERROR); 47 48 __ism_read_cmd(ism, resp, 0, sizeof(*resp)); 49 if (resp->ret) { 50 debug_text_event(ism_debug_info, 0, "cmd failure"); 51 debug_event(ism_debug_info, 0, resp, sizeof(*resp)); 52 goto out; 53 } 54 __ism_read_cmd(ism, resp + 1, sizeof(*resp), resp->len - sizeof(*resp)); 55out: 56 return resp->ret; 57} 58 59static int ism_cmd_simple(struct ism_dev *ism, u32 cmd_code) 60{ 61 union ism_cmd_simple cmd; 62 63 memset(&cmd, 0, sizeof(cmd)); 64 cmd.request.hdr.cmd = cmd_code; 65 cmd.request.hdr.len = sizeof(cmd.request); 66 67 return ism_cmd(ism, &cmd); 68} 69 70static int query_info(struct ism_dev *ism) 71{ 72 union ism_qi cmd; 73 74 memset(&cmd, 0, sizeof(cmd)); 75 cmd.request.hdr.cmd = ISM_QUERY_INFO; 76 cmd.request.hdr.len = sizeof(cmd.request); 77 78 if (ism_cmd(ism, &cmd)) 79 goto out; 80 81 debug_text_event(ism_debug_info, 3, "query info"); 82 debug_event(ism_debug_info, 3, &cmd.response, sizeof(cmd.response)); 83out: 84 return 0; 85} 86 87static int register_sba(struct ism_dev *ism) 88{ 89 union ism_reg_sba cmd; 90 dma_addr_t dma_handle; 91 struct ism_sba *sba; 92 93 sba = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle, 94 GFP_KERNEL); 95 if (!sba) 96 return -ENOMEM; 97 98 memset(&cmd, 0, sizeof(cmd)); 99 cmd.request.hdr.cmd = ISM_REG_SBA; 100 cmd.request.hdr.len = sizeof(cmd.request); 101 cmd.request.sba = dma_handle; 102 103 if (ism_cmd(ism, &cmd)) { 104 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, sba, dma_handle); 105 return -EIO; 106 } 107 108 ism->sba = sba; 109 ism->sba_dma_addr = dma_handle; 110 111 return 0; 112} 113 114static int register_ieq(struct ism_dev *ism) 115{ 116 union ism_reg_ieq cmd; 117 dma_addr_t dma_handle; 118 struct ism_eq *ieq; 119 120 ieq = dma_alloc_coherent(&ism->pdev->dev, PAGE_SIZE, &dma_handle, 121 GFP_KERNEL); 122 if (!ieq) 123 return -ENOMEM; 124 125 memset(&cmd, 0, sizeof(cmd)); 126 cmd.request.hdr.cmd = ISM_REG_IEQ; 127 cmd.request.hdr.len = sizeof(cmd.request); 128 cmd.request.ieq = dma_handle; 129 cmd.request.len = sizeof(*ieq); 130 131 if (ism_cmd(ism, &cmd)) { 132 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, ieq, dma_handle); 133 return -EIO; 134 } 135 136 ism->ieq = ieq; 137 ism->ieq_idx = -1; 138 ism->ieq_dma_addr = dma_handle; 139 140 return 0; 141} 142 143static int unregister_sba(struct ism_dev *ism) 144{ 145 int ret; 146 147 if (!ism->sba) 148 return 0; 149 150 ret = ism_cmd_simple(ism, ISM_UNREG_SBA); 151 if (ret && ret != ISM_ERROR) 152 return -EIO; 153 154 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, 155 ism->sba, ism->sba_dma_addr); 156 157 ism->sba = NULL; 158 ism->sba_dma_addr = 0; 159 160 return 0; 161} 162 163static int unregister_ieq(struct ism_dev *ism) 164{ 165 int ret; 166 167 if (!ism->ieq) 168 return 0; 169 170 ret = ism_cmd_simple(ism, ISM_UNREG_IEQ); 171 if (ret && ret != ISM_ERROR) 172 return -EIO; 173 174 dma_free_coherent(&ism->pdev->dev, PAGE_SIZE, 175 ism->ieq, ism->ieq_dma_addr); 176 177 ism->ieq = NULL; 178 ism->ieq_dma_addr = 0; 179 180 return 0; 181} 182 183static int ism_read_local_gid(struct ism_dev *ism) 184{ 185 union ism_read_gid cmd; 186 int ret; 187 188 memset(&cmd, 0, sizeof(cmd)); 189 cmd.request.hdr.cmd = ISM_READ_GID; 190 cmd.request.hdr.len = sizeof(cmd.request); 191 192 ret = ism_cmd(ism, &cmd); 193 if (ret) 194 goto out; 195 196 ism->smcd->local_gid = cmd.response.gid; 197out: 198 return ret; 199} 200 201static int ism_query_rgid(struct smcd_dev *smcd, u64 rgid, u32 vid_valid, 202 u32 vid) 203{ 204 struct ism_dev *ism = smcd->priv; 205 union ism_query_rgid cmd; 206 207 memset(&cmd, 0, sizeof(cmd)); 208 cmd.request.hdr.cmd = ISM_QUERY_RGID; 209 cmd.request.hdr.len = sizeof(cmd.request); 210 211 cmd.request.rgid = rgid; 212 cmd.request.vlan_valid = vid_valid; 213 cmd.request.vlan_id = vid; 214 215 return ism_cmd(ism, &cmd); 216} 217 218static void ism_free_dmb(struct ism_dev *ism, struct smcd_dmb *dmb) 219{ 220 clear_bit(dmb->sba_idx, ism->sba_bitmap); 221 dma_free_coherent(&ism->pdev->dev, dmb->dmb_len, 222 dmb->cpu_addr, dmb->dma_addr); 223} 224 225static int ism_alloc_dmb(struct ism_dev *ism, struct smcd_dmb *dmb) 226{ 227 unsigned long bit; 228 229 if (PAGE_ALIGN(dmb->dmb_len) > dma_get_max_seg_size(&ism->pdev->dev)) 230 return -EINVAL; 231 232 if (!dmb->sba_idx) { 233 bit = find_next_zero_bit(ism->sba_bitmap, ISM_NR_DMBS, 234 ISM_DMB_BIT_OFFSET); 235 if (bit == ISM_NR_DMBS) 236 return -ENOSPC; 237 238 dmb->sba_idx = bit; 239 } 240 if (dmb->sba_idx < ISM_DMB_BIT_OFFSET || 241 test_and_set_bit(dmb->sba_idx, ism->sba_bitmap)) 242 return -EINVAL; 243 244 dmb->cpu_addr = dma_alloc_coherent(&ism->pdev->dev, dmb->dmb_len, 245 &dmb->dma_addr, 246 GFP_KERNEL | __GFP_NOWARN | __GFP_NOMEMALLOC | __GFP_COMP | __GFP_NORETRY); 247 if (!dmb->cpu_addr) 248 clear_bit(dmb->sba_idx, ism->sba_bitmap); 249 250 return dmb->cpu_addr ? 0 : -ENOMEM; 251} 252 253static int ism_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb) 254{ 255 struct ism_dev *ism = smcd->priv; 256 union ism_reg_dmb cmd; 257 int ret; 258 259 ret = ism_alloc_dmb(ism, dmb); 260 if (ret) 261 goto out; 262 263 memset(&cmd, 0, sizeof(cmd)); 264 cmd.request.hdr.cmd = ISM_REG_DMB; 265 cmd.request.hdr.len = sizeof(cmd.request); 266 267 cmd.request.dmb = dmb->dma_addr; 268 cmd.request.dmb_len = dmb->dmb_len; 269 cmd.request.sba_idx = dmb->sba_idx; 270 cmd.request.vlan_valid = dmb->vlan_valid; 271 cmd.request.vlan_id = dmb->vlan_id; 272 cmd.request.rgid = dmb->rgid; 273 274 ret = ism_cmd(ism, &cmd); 275 if (ret) { 276 ism_free_dmb(ism, dmb); 277 goto out; 278 } 279 dmb->dmb_tok = cmd.response.dmb_tok; 280out: 281 return ret; 282} 283 284static int ism_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb) 285{ 286 struct ism_dev *ism = smcd->priv; 287 union ism_unreg_dmb cmd; 288 int ret; 289 290 memset(&cmd, 0, sizeof(cmd)); 291 cmd.request.hdr.cmd = ISM_UNREG_DMB; 292 cmd.request.hdr.len = sizeof(cmd.request); 293 294 cmd.request.dmb_tok = dmb->dmb_tok; 295 296 ret = ism_cmd(ism, &cmd); 297 if (ret && ret != ISM_ERROR) 298 goto out; 299 300 ism_free_dmb(ism, dmb); 301out: 302 return ret; 303} 304 305static int ism_add_vlan_id(struct smcd_dev *smcd, u64 vlan_id) 306{ 307 struct ism_dev *ism = smcd->priv; 308 union ism_set_vlan_id cmd; 309 310 memset(&cmd, 0, sizeof(cmd)); 311 cmd.request.hdr.cmd = ISM_ADD_VLAN_ID; 312 cmd.request.hdr.len = sizeof(cmd.request); 313 314 cmd.request.vlan_id = vlan_id; 315 316 return ism_cmd(ism, &cmd); 317} 318 319static int ism_del_vlan_id(struct smcd_dev *smcd, u64 vlan_id) 320{ 321 struct ism_dev *ism = smcd->priv; 322 union ism_set_vlan_id cmd; 323 324 memset(&cmd, 0, sizeof(cmd)); 325 cmd.request.hdr.cmd = ISM_DEL_VLAN_ID; 326 cmd.request.hdr.len = sizeof(cmd.request); 327 328 cmd.request.vlan_id = vlan_id; 329 330 return ism_cmd(ism, &cmd); 331} 332 333static int ism_set_vlan_required(struct smcd_dev *smcd) 334{ 335 return ism_cmd_simple(smcd->priv, ISM_SET_VLAN); 336} 337 338static int ism_reset_vlan_required(struct smcd_dev *smcd) 339{ 340 return ism_cmd_simple(smcd->priv, ISM_RESET_VLAN); 341} 342 343static int ism_signal_ieq(struct smcd_dev *smcd, u64 rgid, u32 trigger_irq, 344 u32 event_code, u64 info) 345{ 346 struct ism_dev *ism = smcd->priv; 347 union ism_sig_ieq cmd; 348 349 memset(&cmd, 0, sizeof(cmd)); 350 cmd.request.hdr.cmd = ISM_SIGNAL_IEQ; 351 cmd.request.hdr.len = sizeof(cmd.request); 352 353 cmd.request.rgid = rgid; 354 cmd.request.trigger_irq = trigger_irq; 355 cmd.request.event_code = event_code; 356 cmd.request.info = info; 357 358 return ism_cmd(ism, &cmd); 359} 360 361static unsigned int max_bytes(unsigned int start, unsigned int len, 362 unsigned int boundary) 363{ 364 return min(boundary - (start & (boundary - 1)), len); 365} 366 367static int ism_move(struct smcd_dev *smcd, u64 dmb_tok, unsigned int idx, 368 bool sf, unsigned int offset, void *data, unsigned int size) 369{ 370 struct ism_dev *ism = smcd->priv; 371 unsigned int bytes; 372 u64 dmb_req; 373 int ret; 374 375 while (size) { 376 bytes = max_bytes(offset, size, PAGE_SIZE); 377 dmb_req = ISM_CREATE_REQ(dmb_tok, idx, size == bytes ? sf : 0, 378 offset); 379 380 ret = __ism_move(ism, dmb_req, data, bytes); 381 if (ret) 382 return ret; 383 384 size -= bytes; 385 data += bytes; 386 offset += bytes; 387 } 388 389 return 0; 390} 391 392static struct ism_systemeid SYSTEM_EID = { 393 .seid_string = "IBM-SYSZ-ISMSEID00000000", 394 .serial_number = "0000", 395 .type = "0000", 396}; 397 398static void ism_create_system_eid(void) 399{ 400 struct cpuid id; 401 u16 ident_tail; 402 char tmp[5]; 403 404 get_cpu_id(&id); 405 ident_tail = (u16)(id.ident & ISM_IDENT_MASK); 406 snprintf(tmp, 5, "%04X", ident_tail); 407 memcpy(&SYSTEM_EID.serial_number, tmp, 4); 408 snprintf(tmp, 5, "%04X", id.machine); 409 memcpy(&SYSTEM_EID.type, tmp, 4); 410} 411 412static void ism_get_system_eid(struct smcd_dev *smcd, u8 **eid) 413{ 414 *eid = &SYSTEM_EID.seid_string[0]; 415} 416 417static u16 ism_get_chid(struct smcd_dev *smcd) 418{ 419 struct ism_dev *ismdev; 420 421 ismdev = (struct ism_dev *)smcd->priv; 422 if (!ismdev || !ismdev->pdev) 423 return 0; 424 425 return to_zpci(ismdev->pdev)->pchid; 426} 427 428static void ism_handle_event(struct ism_dev *ism) 429{ 430 struct smcd_event *entry; 431 432 while ((ism->ieq_idx + 1) != READ_ONCE(ism->ieq->header.idx)) { 433 if (++(ism->ieq_idx) == ARRAY_SIZE(ism->ieq->entry)) 434 ism->ieq_idx = 0; 435 436 entry = &ism->ieq->entry[ism->ieq_idx]; 437 debug_event(ism_debug_info, 2, entry, sizeof(*entry)); 438 smcd_handle_event(ism->smcd, entry); 439 } 440} 441 442static irqreturn_t ism_handle_irq(int irq, void *data) 443{ 444 struct ism_dev *ism = data; 445 unsigned long bit, end; 446 unsigned long *bv; 447 448 bv = (void *) &ism->sba->dmb_bits[ISM_DMB_WORD_OFFSET]; 449 end = sizeof(ism->sba->dmb_bits) * BITS_PER_BYTE - ISM_DMB_BIT_OFFSET; 450 451 spin_lock(&ism->lock); 452 ism->sba->s = 0; 453 barrier(); 454 for (bit = 0;;) { 455 bit = find_next_bit_inv(bv, end, bit); 456 if (bit >= end) 457 break; 458 459 clear_bit_inv(bit, bv); 460 ism->sba->dmbe_mask[bit + ISM_DMB_BIT_OFFSET] = 0; 461 barrier(); 462 smcd_handle_irq(ism->smcd, bit + ISM_DMB_BIT_OFFSET); 463 } 464 465 if (ism->sba->e) { 466 ism->sba->e = 0; 467 barrier(); 468 ism_handle_event(ism); 469 } 470 spin_unlock(&ism->lock); 471 return IRQ_HANDLED; 472} 473 474static const struct smcd_ops ism_ops = { 475 .query_remote_gid = ism_query_rgid, 476 .register_dmb = ism_register_dmb, 477 .unregister_dmb = ism_unregister_dmb, 478 .add_vlan_id = ism_add_vlan_id, 479 .del_vlan_id = ism_del_vlan_id, 480 .set_vlan_required = ism_set_vlan_required, 481 .reset_vlan_required = ism_reset_vlan_required, 482 .signal_event = ism_signal_ieq, 483 .move_data = ism_move, 484 .get_system_eid = ism_get_system_eid, 485 .get_chid = ism_get_chid, 486}; 487 488static int ism_dev_init(struct ism_dev *ism) 489{ 490 struct pci_dev *pdev = ism->pdev; 491 int ret; 492 493 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI); 494 if (ret <= 0) 495 goto out; 496 497 ret = request_irq(pci_irq_vector(pdev, 0), ism_handle_irq, 0, 498 pci_name(pdev), ism); 499 if (ret) 500 goto free_vectors; 501 502 ret = register_sba(ism); 503 if (ret) 504 goto free_irq; 505 506 ret = register_ieq(ism); 507 if (ret) 508 goto unreg_sba; 509 510 ret = ism_read_local_gid(ism); 511 if (ret) 512 goto unreg_ieq; 513 514 if (!ism_add_vlan_id(ism->smcd, ISM_RESERVED_VLANID)) 515 /* hardware is V2 capable */ 516 ism_create_system_eid(); 517 518 ret = smcd_register_dev(ism->smcd); 519 if (ret) 520 goto unreg_ieq; 521 522 query_info(ism); 523 return 0; 524 525unreg_ieq: 526 unregister_ieq(ism); 527unreg_sba: 528 unregister_sba(ism); 529free_irq: 530 free_irq(pci_irq_vector(pdev, 0), ism); 531free_vectors: 532 pci_free_irq_vectors(pdev); 533out: 534 return ret; 535} 536 537static int ism_probe(struct pci_dev *pdev, const struct pci_device_id *id) 538{ 539 struct ism_dev *ism; 540 int ret; 541 542 ism = kzalloc(sizeof(*ism), GFP_KERNEL); 543 if (!ism) 544 return -ENOMEM; 545 546 spin_lock_init(&ism->lock); 547 dev_set_drvdata(&pdev->dev, ism); 548 ism->pdev = pdev; 549 550 ret = pci_enable_device_mem(pdev); 551 if (ret) 552 goto err; 553 554 ret = pci_request_mem_regions(pdev, DRV_NAME); 555 if (ret) 556 goto err_disable; 557 558 ret = pci_set_dma_mask(pdev, DMA_BIT_MASK(64)); 559 if (ret) 560 goto err_resource; 561 562 dma_set_seg_boundary(&pdev->dev, SZ_1M - 1); 563 dma_set_max_seg_size(&pdev->dev, SZ_1M); 564 pci_set_master(pdev); 565 566 ism->smcd = smcd_alloc_dev(&pdev->dev, dev_name(&pdev->dev), &ism_ops, 567 ISM_NR_DMBS); 568 if (!ism->smcd) { 569 ret = -ENOMEM; 570 goto err_resource; 571 } 572 573 ism->smcd->priv = ism; 574 ret = ism_dev_init(ism); 575 if (ret) 576 goto err_free; 577 578 return 0; 579 580err_free: 581 smcd_free_dev(ism->smcd); 582err_resource: 583 pci_release_mem_regions(pdev); 584err_disable: 585 pci_disable_device(pdev); 586err: 587 kfree(ism); 588 dev_set_drvdata(&pdev->dev, NULL); 589 return ret; 590} 591 592static void ism_dev_exit(struct ism_dev *ism) 593{ 594 struct pci_dev *pdev = ism->pdev; 595 596 smcd_unregister_dev(ism->smcd); 597 if (SYSTEM_EID.serial_number[0] != '0' || 598 SYSTEM_EID.type[0] != '0') 599 ism_del_vlan_id(ism->smcd, ISM_RESERVED_VLANID); 600 unregister_ieq(ism); 601 unregister_sba(ism); 602 free_irq(pci_irq_vector(pdev, 0), ism); 603 pci_free_irq_vectors(pdev); 604} 605 606static void ism_remove(struct pci_dev *pdev) 607{ 608 struct ism_dev *ism = dev_get_drvdata(&pdev->dev); 609 610 ism_dev_exit(ism); 611 612 smcd_free_dev(ism->smcd); 613 pci_release_mem_regions(pdev); 614 pci_disable_device(pdev); 615 dev_set_drvdata(&pdev->dev, NULL); 616 kfree(ism); 617} 618 619static struct pci_driver ism_driver = { 620 .name = DRV_NAME, 621 .id_table = ism_device_table, 622 .probe = ism_probe, 623 .remove = ism_remove, 624}; 625 626static int __init ism_init(void) 627{ 628 int ret; 629 630 ism_debug_info = debug_register("ism", 2, 1, 16); 631 if (!ism_debug_info) 632 return -ENODEV; 633 634 debug_register_view(ism_debug_info, &debug_hex_ascii_view); 635 ret = pci_register_driver(&ism_driver); 636 if (ret) 637 debug_unregister(ism_debug_info); 638 639 return ret; 640} 641 642static void __exit ism_exit(void) 643{ 644 pci_unregister_driver(&ism_driver); 645 debug_unregister(ism_debug_info); 646} 647 648module_init(ism_init); 649module_exit(ism_exit); 650