linux/arch/s390/pci/pci_clp.c
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   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
  25bool zpci_unique_uid;
  26
  27void 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
  35static 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 */
  49static 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 */
  69static __always_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
  87static void *clp_alloc_block(gfp_t gfp_mask)
  88{
  89        return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
  90}
  91
  92static void clp_free_block(void *ptr)
  93{
  94        free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
  95}
  96
  97static 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        zdev->version = response->version;
 106
 107        switch (response->version) {
 108        case 1:
 109                zdev->max_bus_speed = PCIE_SPEED_5_0GT;
 110                break;
 111        default:
 112                zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
 113                break;
 114        }
 115}
 116
 117static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
 118{
 119        struct clp_req_rsp_query_pci_grp *rrb;
 120        int rc;
 121
 122        rrb = clp_alloc_block(GFP_KERNEL);
 123        if (!rrb)
 124                return -ENOMEM;
 125
 126        memset(rrb, 0, sizeof(*rrb));
 127        rrb->request.hdr.len = sizeof(rrb->request);
 128        rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
 129        rrb->response.hdr.len = sizeof(rrb->response);
 130        rrb->request.pfgid = pfgid;
 131
 132        rc = clp_req(rrb, CLP_LPS_PCI);
 133        if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 134                clp_store_query_pci_fngrp(zdev, &rrb->response);
 135        else {
 136                zpci_err("Q PCI FGRP:\n");
 137                zpci_err_clp(rrb->response.hdr.rsp, rc);
 138                rc = -EIO;
 139        }
 140        clp_free_block(rrb);
 141        return rc;
 142}
 143
 144static int clp_store_query_pci_fn(struct zpci_dev *zdev,
 145                                  struct clp_rsp_query_pci *response)
 146{
 147        int i;
 148
 149        for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 150                zdev->bars[i].val = le32_to_cpu(response->bar[i]);
 151                zdev->bars[i].size = response->bar_size[i];
 152        }
 153        zdev->start_dma = response->sdma;
 154        zdev->end_dma = response->edma;
 155        zdev->pchid = response->pchid;
 156        zdev->pfgid = response->pfgid;
 157        zdev->pft = response->pft;
 158        zdev->vfn = response->vfn;
 159        zdev->port = response->port;
 160        zdev->uid = response->uid;
 161        zdev->fmb_length = sizeof(u32) * response->fmb_len;
 162        zdev->rid_available = response->rid_avail;
 163        zdev->is_physfn = response->is_physfn;
 164        if (!s390_pci_no_rid && zdev->rid_available)
 165                zdev->devfn = response->rid & ZPCI_RID_MASK_DEVFN;
 166
 167        memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
 168        if (response->util_str_avail) {
 169                memcpy(zdev->util_str, response->util_str,
 170                       sizeof(zdev->util_str));
 171                zdev->util_str_avail = 1;
 172        }
 173        zdev->mio_capable = response->mio_addr_avail;
 174        for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 175                if (!(response->mio.valid & (1 << (PCI_STD_NUM_BARS - i - 1))))
 176                        continue;
 177
 178                zdev->bars[i].mio_wb = (void __iomem *) response->mio.addr[i].wb;
 179                zdev->bars[i].mio_wt = (void __iomem *) response->mio.addr[i].wt;
 180        }
 181        return 0;
 182}
 183
 184int clp_query_pci_fn(struct zpci_dev *zdev)
 185{
 186        struct clp_req_rsp_query_pci *rrb;
 187        int rc;
 188
 189        rrb = clp_alloc_block(GFP_KERNEL);
 190        if (!rrb)
 191                return -ENOMEM;
 192
 193        memset(rrb, 0, sizeof(*rrb));
 194        rrb->request.hdr.len = sizeof(rrb->request);
 195        rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
 196        rrb->response.hdr.len = sizeof(rrb->response);
 197        rrb->request.fh = zdev->fh;
 198
 199        rc = clp_req(rrb, CLP_LPS_PCI);
 200        if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 201                rc = clp_store_query_pci_fn(zdev, &rrb->response);
 202                if (rc)
 203                        goto out;
 204                rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
 205        } else {
 206                zpci_err("Q PCI FN:\n");
 207                zpci_err_clp(rrb->response.hdr.rsp, rc);
 208                rc = -EIO;
 209        }
 210out:
 211        clp_free_block(rrb);
 212        return rc;
 213}
 214
 215static int clp_refresh_fh(u32 fid);
 216/*
 217 * Enable/Disable a given PCI function and update its function handle if
 218 * necessary
 219 */
 220static int clp_set_pci_fn(struct zpci_dev *zdev, u8 nr_dma_as, u8 command)
 221{
 222        struct clp_req_rsp_set_pci *rrb;
 223        int rc, retries = 100;
 224        u32 fid = zdev->fid;
 225
 226        rrb = clp_alloc_block(GFP_KERNEL);
 227        if (!rrb)
 228                return -ENOMEM;
 229
 230        do {
 231                memset(rrb, 0, sizeof(*rrb));
 232                rrb->request.hdr.len = sizeof(rrb->request);
 233                rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 234                rrb->response.hdr.len = sizeof(rrb->response);
 235                rrb->request.fh = zdev->fh;
 236                rrb->request.oc = command;
 237                rrb->request.ndas = nr_dma_as;
 238
 239                rc = clp_req(rrb, CLP_LPS_PCI);
 240                if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 241                        retries--;
 242                        if (retries < 0)
 243                                break;
 244                        msleep(20);
 245                }
 246        } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 247
 248        if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 249                zpci_err("Set PCI FN:\n");
 250                zpci_err_clp(rrb->response.hdr.rsp, rc);
 251        }
 252
 253        if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 254                zdev->fh = rrb->response.fh;
 255        } else if (!rc && rrb->response.hdr.rsp == CLP_RC_SETPCIFN_ALRDY &&
 256                        rrb->response.fh == 0) {
 257                /* Function is already in desired state - update handle */
 258                rc = clp_refresh_fh(fid);
 259        }
 260        clp_free_block(rrb);
 261        return rc;
 262}
 263
 264int clp_setup_writeback_mio(void)
 265{
 266        struct clp_req_rsp_slpc_pci *rrb;
 267        u8  wb_bit_pos;
 268        int rc;
 269
 270        rrb = clp_alloc_block(GFP_KERNEL);
 271        if (!rrb)
 272                return -ENOMEM;
 273
 274        memset(rrb, 0, sizeof(*rrb));
 275        rrb->request.hdr.len = sizeof(rrb->request);
 276        rrb->request.hdr.cmd = CLP_SLPC;
 277        rrb->response.hdr.len = sizeof(rrb->response);
 278
 279        rc = clp_req(rrb, CLP_LPS_PCI);
 280        if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 281                if (rrb->response.vwb) {
 282                        wb_bit_pos = rrb->response.mio_wb;
 283                        set_bit_inv(wb_bit_pos, &mio_wb_bit_mask);
 284                        zpci_dbg(3, "wb bit: %d\n", wb_bit_pos);
 285                } else {
 286                        zpci_dbg(3, "wb bit: n.a.\n");
 287                }
 288
 289        } else {
 290                zpci_err("SLPC PCI:\n");
 291                zpci_err_clp(rrb->response.hdr.rsp, rc);
 292                rc = -EIO;
 293        }
 294        clp_free_block(rrb);
 295        return rc;
 296}
 297
 298int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 299{
 300        int rc;
 301
 302        rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 303        zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 304        if (rc)
 305                goto out;
 306
 307        if (zpci_use_mio(zdev)) {
 308                rc = clp_set_pci_fn(zdev, nr_dma_as, CLP_SET_ENABLE_MIO);
 309                zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n",
 310                                zdev->fid, zdev->fh, rc);
 311                if (rc)
 312                        clp_disable_fh(zdev);
 313        }
 314out:
 315        return rc;
 316}
 317
 318int clp_disable_fh(struct zpci_dev *zdev)
 319{
 320        int rc;
 321
 322        if (!zdev_enabled(zdev))
 323                return 0;
 324
 325        rc = clp_set_pci_fn(zdev, 0, CLP_SET_DISABLE_PCI_FN);
 326        zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 327        return rc;
 328}
 329
 330static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
 331                        void (*cb)(struct clp_fh_list_entry *, void *))
 332{
 333        u64 resume_token = 0;
 334        int entries, i, rc;
 335
 336        do {
 337                memset(rrb, 0, sizeof(*rrb));
 338                rrb->request.hdr.len = sizeof(rrb->request);
 339                rrb->request.hdr.cmd = CLP_LIST_PCI;
 340                /* store as many entries as possible */
 341                rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 342                rrb->request.resume_token = resume_token;
 343
 344                /* Get PCI function handle list */
 345                rc = clp_req(rrb, CLP_LPS_PCI);
 346                if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 347                        zpci_err("List PCI FN:\n");
 348                        zpci_err_clp(rrb->response.hdr.rsp, rc);
 349                        rc = -EIO;
 350                        goto out;
 351                }
 352
 353                update_uid_checking(rrb->response.uid_checking);
 354                WARN_ON_ONCE(rrb->response.entry_size !=
 355                        sizeof(struct clp_fh_list_entry));
 356
 357                entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 358                        rrb->response.entry_size;
 359
 360                resume_token = rrb->response.resume_token;
 361                for (i = 0; i < entries; i++)
 362                        cb(&rrb->response.fh_list[i], data);
 363        } while (resume_token);
 364out:
 365        return rc;
 366}
 367
 368static void __clp_add(struct clp_fh_list_entry *entry, void *data)
 369{
 370        struct zpci_dev *zdev;
 371
 372        if (!entry->vendor_id)
 373                return;
 374
 375        zdev = get_zdev_by_fid(entry->fid);
 376        if (!zdev)
 377                zpci_create_device(entry->fid, entry->fh, entry->config_state);
 378}
 379
 380int clp_scan_pci_devices(void)
 381{
 382        struct clp_req_rsp_list_pci *rrb;
 383        int rc;
 384
 385        rrb = clp_alloc_block(GFP_KERNEL);
 386        if (!rrb)
 387                return -ENOMEM;
 388
 389        rc = clp_list_pci(rrb, NULL, __clp_add);
 390
 391        clp_free_block(rrb);
 392        return rc;
 393}
 394
 395static void __clp_refresh_fh(struct clp_fh_list_entry *entry, void *data)
 396{
 397        struct zpci_dev *zdev;
 398        u32 fid = *((u32 *)data);
 399
 400        if (!entry->vendor_id || fid != entry->fid)
 401                return;
 402
 403        zdev = get_zdev_by_fid(fid);
 404        if (!zdev)
 405                return;
 406
 407        zdev->fh = entry->fh;
 408}
 409
 410/*
 411 * Refresh the function handle of the function matching @fid
 412 */
 413static int clp_refresh_fh(u32 fid)
 414{
 415        struct clp_req_rsp_list_pci *rrb;
 416        int rc;
 417
 418        rrb = clp_alloc_block(GFP_NOWAIT);
 419        if (!rrb)
 420                return -ENOMEM;
 421
 422        rc = clp_list_pci(rrb, &fid, __clp_refresh_fh);
 423
 424        clp_free_block(rrb);
 425        return rc;
 426}
 427
 428struct clp_state_data {
 429        u32 fid;
 430        enum zpci_state state;
 431};
 432
 433static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
 434{
 435        struct clp_state_data *sd = data;
 436
 437        if (entry->fid != sd->fid)
 438                return;
 439
 440        sd->state = entry->config_state;
 441}
 442
 443int clp_get_state(u32 fid, enum zpci_state *state)
 444{
 445        struct clp_req_rsp_list_pci *rrb;
 446        struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
 447        int rc;
 448
 449        rrb = clp_alloc_block(GFP_ATOMIC);
 450        if (!rrb)
 451                return -ENOMEM;
 452
 453        rc = clp_list_pci(rrb, &sd, __clp_get_state);
 454        if (!rc)
 455                *state = sd.state;
 456
 457        clp_free_block(rrb);
 458        return rc;
 459}
 460
 461static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 462{
 463        unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 464
 465        if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 466            lpcb->response.hdr.len > limit)
 467                return -EINVAL;
 468        return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
 469}
 470
 471static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 472{
 473        switch (lpcb->cmd) {
 474        case 0x0001: /* store logical-processor characteristics */
 475                return clp_base_slpc(req, (void *) lpcb);
 476        default:
 477                return -EINVAL;
 478        }
 479}
 480
 481static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc_pci *lpcb)
 482{
 483        unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 484
 485        if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 486            lpcb->response.hdr.len > limit)
 487                return -EINVAL;
 488        return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 489}
 490
 491static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
 492{
 493        unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 494
 495        if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 496            lpcb->response.hdr.len > limit)
 497                return -EINVAL;
 498        if (lpcb->request.reserved2 != 0)
 499                return -EINVAL;
 500        return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 501}
 502
 503static int clp_pci_query(struct clp_req *req,
 504                         struct clp_req_rsp_query_pci *lpcb)
 505{
 506        unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 507
 508        if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 509            lpcb->response.hdr.len > limit)
 510                return -EINVAL;
 511        if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
 512                return -EINVAL;
 513        return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 514}
 515
 516static int clp_pci_query_grp(struct clp_req *req,
 517                             struct clp_req_rsp_query_pci_grp *lpcb)
 518{
 519        unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 520
 521        if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 522            lpcb->response.hdr.len > limit)
 523                return -EINVAL;
 524        if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
 525            lpcb->request.reserved4 != 0)
 526                return -EINVAL;
 527        return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 528}
 529
 530static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 531{
 532        switch (lpcb->cmd) {
 533        case 0x0001: /* store logical-processor characteristics */
 534                return clp_pci_slpc(req, (void *) lpcb);
 535        case 0x0002: /* list PCI functions */
 536                return clp_pci_list(req, (void *) lpcb);
 537        case 0x0003: /* query PCI function */
 538                return clp_pci_query(req, (void *) lpcb);
 539        case 0x0004: /* query PCI function group */
 540                return clp_pci_query_grp(req, (void *) lpcb);
 541        default:
 542                return -EINVAL;
 543        }
 544}
 545
 546static int clp_normal_command(struct clp_req *req)
 547{
 548        struct clp_req_hdr *lpcb;
 549        void __user *uptr;
 550        int rc;
 551
 552        rc = -EINVAL;
 553        if (req->lps != 0 && req->lps != 2)
 554                goto out;
 555
 556        rc = -ENOMEM;
 557        lpcb = clp_alloc_block(GFP_KERNEL);
 558        if (!lpcb)
 559                goto out;
 560
 561        rc = -EFAULT;
 562        uptr = (void __force __user *)(unsigned long) req->data_p;
 563        if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
 564                goto out_free;
 565
 566        rc = -EINVAL;
 567        if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
 568                goto out_free;
 569
 570        switch (req->lps) {
 571        case 0:
 572                rc = clp_base_command(req, lpcb);
 573                break;
 574        case 2:
 575                rc = clp_pci_command(req, lpcb);
 576                break;
 577        }
 578        if (rc)
 579                goto out_free;
 580
 581        rc = -EFAULT;
 582        if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
 583                goto out_free;
 584
 585        rc = 0;
 586
 587out_free:
 588        clp_free_block(lpcb);
 589out:
 590        return rc;
 591}
 592
 593static int clp_immediate_command(struct clp_req *req)
 594{
 595        void __user *uptr;
 596        unsigned long ilp;
 597        int exists;
 598
 599        if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
 600                return -EINVAL;
 601
 602        uptr = (void __force __user *)(unsigned long) req->data_p;
 603        if (req->cmd == 0) {
 604                /* Command code 0: test for a specific processor */
 605                exists = test_bit_inv(req->lps, &ilp);
 606                return put_user(exists, (int __user *) uptr);
 607        }
 608        /* Command code 1: return bit mask of installed processors */
 609        return put_user(ilp, (unsigned long __user *) uptr);
 610}
 611
 612static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
 613                           unsigned long arg)
 614{
 615        struct clp_req req;
 616        void __user *argp;
 617
 618        if (cmd != CLP_SYNC)
 619                return -EINVAL;
 620
 621        argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
 622        if (copy_from_user(&req, argp, sizeof(req)))
 623                return -EFAULT;
 624        if (req.r != 0)
 625                return -EINVAL;
 626        return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
 627}
 628
 629static int clp_misc_release(struct inode *inode, struct file *filp)
 630{
 631        return 0;
 632}
 633
 634static const struct file_operations clp_misc_fops = {
 635        .owner = THIS_MODULE,
 636        .open = nonseekable_open,
 637        .release = clp_misc_release,
 638        .unlocked_ioctl = clp_misc_ioctl,
 639        .compat_ioctl = clp_misc_ioctl,
 640        .llseek = no_llseek,
 641};
 642
 643static struct miscdevice clp_misc_device = {
 644        .minor = MISC_DYNAMIC_MINOR,
 645        .name = "clp",
 646        .fops = &clp_misc_fops,
 647};
 648
 649static int __init clp_misc_init(void)
 650{
 651        return misc_register(&clp_misc_device);
 652}
 653
 654device_initcall(clp_misc_init);
 655