drivers/misc/genwqe/card_dev.c

   1 /**
   2  * IBM Accelerator Family 'GenWQE'
   3  *
   4  * (C) Copyright IBM Corp. 2013
   5  *
   6  * Author: Frank Haverkamp <haver@linux.vnet.ibm.com>
   7  * Author: Joerg-Stephan Vogt <jsvogt@de.ibm.com>
   8  * Author: Michael Jung <mijung@gmx.net>
   9  * Author: Michael Ruettger <michael@ibmra.de>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License (version 2 only)
  13  * as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  */
  20
  21 /*
  22  * Character device representation of the GenWQE device. This allows
  23  * user-space applications to communicate with the card.
  24  */
  25
  26 #include <linux/kernel.h>
  27 #include <linux/types.h>
  28 #include <linux/module.h>
  29 #include <linux/pci.h>
  30 #include <linux/string.h>
  31 #include <linux/fs.h>
  32 #include <linux/sched/signal.h>
  33 #include <linux/wait.h>
  34 #include <linux/delay.h>
  35 #include <linux/atomic.h>
  36
  37 #include "card_base.h"
  38 #include "card_ddcb.h"
  39
  40 static int genwqe_open_files(struct genwqe_dev *cd)
  41 {
  42         int rc;
  43         unsigned long flags;
  44
  45         spin_lock_irqsave(&cd->file_lock, flags);
  46         rc = list_empty(&cd->file_list);
  47         spin_unlock_irqrestore(&cd->file_lock, flags);
  48         return !rc;
  49 }
  50
  51 static void genwqe_add_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
  52 {
  53         unsigned long flags;
  54
  55         cfile->opener = get_pid(task_tgid(current));
  56         spin_lock_irqsave(&cd->file_lock, flags);
  57         list_add(&cfile->list, &cd->file_list);
  58         spin_unlock_irqrestore(&cd->file_lock, flags);
  59 }
  60
  61 static int genwqe_del_file(struct genwqe_dev *cd, struct genwqe_file *cfile)
  62 {
  63         unsigned long flags;
  64
  65         spin_lock_irqsave(&cd->file_lock, flags);
  66         list_del(&cfile->list);
  67         spin_unlock_irqrestore(&cd->file_lock, flags);
  68         put_pid(cfile->opener);
  69
  70         return 0;
  71 }
  72
  73 static void genwqe_add_pin(struct genwqe_file *cfile, struct dma_mapping *m)
  74 {
  75         unsigned long flags;
  76
  77         spin_lock_irqsave(&cfile->pin_lock, flags);
  78         list_add(&m->pin_list, &cfile->pin_list);
  79         spin_unlock_irqrestore(&cfile->pin_lock, flags);
  80 }
  81
  82 static int genwqe_del_pin(struct genwqe_file *cfile, struct dma_mapping *m)
  83 {
  84         unsigned long flags;
  85
  86         spin_lock_irqsave(&cfile->pin_lock, flags);
  87         list_del(&m->pin_list);
  88         spin_unlock_irqrestore(&cfile->pin_lock, flags);
  89
  90         return 0;
  91 }
  92
  93 /**
  94  * genwqe_search_pin() - Search for the mapping for a userspace address
  95  * @cfile:      Descriptor of opened file
  96  * @u_addr:     User virtual address
  97  * @size:       Size of buffer
  98  * @dma_addr:   DMA address to be updated
  99  *
 100  * Return: Pointer to the corresponding mapping NULL if not found
 101  */
 102 static struct dma_mapping *genwqe_search_pin(struct genwqe_file *cfile,
 103                                             unsigned long u_addr,
 104                                             unsigned int size,
 105                                             void **virt_addr)
 106 {
 107         unsigned long flags;
 108         struct dma_mapping *m;
 109
 110         spin_lock_irqsave(&cfile->pin_lock, flags);
 111
 112         list_for_each_entry(m, &cfile->pin_list, pin_list) {
 113                 if ((((u64)m->u_vaddr) <= (u_addr)) &&
 114                     (((u64)m->u_vaddr + m->size) >= (u_addr + size))) {
 115
 116                         if (virt_addr)
 117                                 *virt_addr = m->k_vaddr +
 118                                         (u_addr - (u64)m->u_vaddr);
 119
 120                         spin_unlock_irqrestore(&cfile->pin_lock, flags);
 121                         return m;
 122                 }
 123         }
 124         spin_unlock_irqrestore(&cfile->pin_lock, flags);
 125         return NULL;
 126 }
 127
 128 static void __genwqe_add_mapping(struct genwqe_file *cfile,
 129                               struct dma_mapping *dma_map)
 130 {
 131         unsigned long flags;
 132
 133         spin_lock_irqsave(&cfile->map_lock, flags);
 134         list_add(&dma_map->card_list, &cfile->map_list);
 135         spin_unlock_irqrestore(&cfile->map_lock, flags);
 136 }
 137
 138 static void __genwqe_del_mapping(struct genwqe_file *cfile,
 139                               struct dma_mapping *dma_map)
 140 {
 141         unsigned long flags;
 142
 143         spin_lock_irqsave(&cfile->map_lock, flags);
 144         list_del(&dma_map->card_list);
 145         spin_unlock_irqrestore(&cfile->map_lock, flags);
 146 }
 147
 148
 149 /**
 150  * __genwqe_search_mapping() - Search for the mapping for a userspace address
 151  * @cfile:      descriptor of opened file
 152  * @u_addr:     user virtual address
 153  * @size:       size of buffer
 154  * @dma_addr:   DMA address to be updated
 155  * Return: Pointer to the corresponding mapping NULL if not found
 156  */
 157 static struct dma_mapping *__genwqe_search_mapping(struct genwqe_file *cfile,
 158                                                    unsigned long u_addr,
 159                                                    unsigned int size,
 160                                                    dma_addr_t *dma_addr,
 161                                                    void **virt_addr)
 162 {
 163         unsigned long flags;
 164         struct dma_mapping *m;
 165         struct pci_dev *pci_dev = cfile->cd->pci_dev;
 166
 167         spin_lock_irqsave(&cfile->map_lock, flags);
 168         list_for_each_entry(m, &cfile->map_list, card_list) {
 169
 170                 if ((((u64)m->u_vaddr) <= (u_addr)) &&
 171                     (((u64)m->u_vaddr + m->size) >= (u_addr + size))) {
 172
 173                         /* match found: current is as expected and
 174                            addr is in range */
 175                         if (dma_addr)
 176                                 *dma_addr = m->dma_addr +
 177                                         (u_addr - (u64)m->u_vaddr);
 178
 179                         if (virt_addr)
 180                                 *virt_addr = m->k_vaddr +
 181                                         (u_addr - (u64)m->u_vaddr);
 182
 183                         spin_unlock_irqrestore(&cfile->map_lock, flags);
 184                         return m;
 185                 }
 186         }
 187         spin_unlock_irqrestore(&cfile->map_lock, flags);
 188
 189         dev_err(&pci_dev->dev,
 190                 "[%s] Entry not found: u_addr=%lx, size=%x\n",
 191                 __func__, u_addr, size);
 192
 193         return NULL;
 194 }
 195
 196 static void genwqe_remove_mappings(struct genwqe_file *cfile)
 197 {
 198         int i = 0;
 199         struct list_head *node, *next;
 200         struct dma_mapping *dma_map;
 201         struct genwqe_dev *cd = cfile->cd;
 202         struct pci_dev *pci_dev = cfile->cd->pci_dev;
 203
 204         list_for_each_safe(node, next, &cfile->map_list) {
 205                 dma_map = list_entry(node, struct dma_mapping, card_list);
 206
 207                 list_del_init(&dma_map->card_list);
 208
 209                 /*
 210                  * This is really a bug, because those things should
 211                  * have been already tidied up.
 212                  *
 213                  * GENWQE_MAPPING_RAW should have been removed via mmunmap().
 214                  * GENWQE_MAPPING_SGL_TEMP should be removed by tidy up code.
 215                  */
 216                 dev_err(&pci_dev->dev,
 217                         "[%s] %d. cleanup mapping: u_vaddr=%p u_kaddr=%016lx dma_addr=%lx\n",
 218                         __func__, i++, dma_map->u_vaddr,
 219                         (unsigned long)dma_map->k_vaddr,
 220                         (unsigned long)dma_map->dma_addr);
 221
 222                 if (dma_map->type == GENWQE_MAPPING_RAW) {
 223                         /* we allocated this dynamically */
 224                         __genwqe_free_consistent(cd, dma_map->size,
 225                                                 dma_map->k_vaddr,
 226                                                 dma_map->dma_addr);
 227                         kfree(dma_map);
 228                 } else if (dma_map->type == GENWQE_MAPPING_SGL_TEMP) {
 229                         /* we use dma_map statically from the request */
 230                         genwqe_user_vunmap(cd, dma_map);
 231                 }
 232         }
 233 }
 234
 235 static void genwqe_remove_pinnings(struct genwqe_file *cfile)
 236 {
 237         struct list_head *node, *next;
 238         struct dma_mapping *dma_map;
 239         struct genwqe_dev *cd = cfile->cd;
 240
 241         list_for_each_safe(node, next, &cfile->pin_list) {
 242                 dma_map = list_entry(node, struct dma_mapping, pin_list);
 243
 244                 /*
 245                  * This is not a bug, because a killed processed might
 246                  * not call the unpin ioctl, which is supposed to free
 247                  * the resources.
 248                  *
 249                  * Pinnings are dymically allocated and need to be
 250                  * deleted.
 251                  */
 252                 list_del_init(&dma_map->pin_list);
 253                 genwqe_user_vunmap(cd, dma_map);
 254                 kfree(dma_map);
 255         }
 256 }
 257
 258 /**
 259  * genwqe_kill_fasync() - Send signal to all processes with open GenWQE files
 260  *
 261  * E.g. genwqe_send_signal(cd, SIGIO);
 262  */
 263 static int genwqe_kill_fasync(struct genwqe_dev *cd, int sig)
 264 {
 265         unsigned int files = 0;
 266         unsigned long flags;
 267         struct genwqe_file *cfile;
 268
 269         spin_lock_irqsave(&cd->file_lock, flags);
 270         list_for_each_entry(cfile, &cd->file_list, list) {
 271                 if (cfile->async_queue)
 272                         kill_fasync(&cfile->async_queue, sig, POLL_HUP);
 273                 files++;
 274         }
 275         spin_unlock_irqrestore(&cd->file_lock, flags);
 276         return files;
 277 }
 278
 279 static int genwqe_terminate(struct genwqe_dev *cd)
 280 {
 281         unsigned int files = 0;
 282         unsigned long flags;
 283         struct genwqe_file *cfile;
 284
 285         spin_lock_irqsave(&cd->file_lock, flags);
 286         list_for_each_entry(cfile, &cd->file_list, list) {
 287                 kill_pid(cfile->opener, SIGKILL, 1);
 288                 files++;
 289         }
 290         spin_unlock_irqrestore(&cd->file_lock, flags);
 291         return files;
 292 }
 293
 294 /**
 295  * genwqe_open() - file open
 296  * @inode:      file system information
 297  * @filp:       file handle
 298  *
 299  * This function is executed whenever an application calls
 300  * open("/dev/genwqe",..).
 301  *
 302  * Return: 0 if successful or <0 if errors
 303  */
 304 static int genwqe_open(struct inode *inode, struct file *filp)
 305 {
 306         struct genwqe_dev *cd;
 307         struct genwqe_file *cfile;
 308
 309         cfile = kzalloc(sizeof(*cfile), GFP_KERNEL);
 310         if (cfile == NULL)
 311                 return -ENOMEM;
 312
 313         cd = container_of(inode->i_cdev, struct genwqe_dev, cdev_genwqe);
 314         cfile->cd = cd;
 315         cfile->filp = filp;
 316         cfile->client = NULL;
 317
 318         spin_lock_init(&cfile->map_lock);  /* list of raw memory allocations */
 319         INIT_LIST_HEAD(&cfile->map_list);
 320
 321         spin_lock_init(&cfile->pin_lock);  /* list of user pinned memory */
 322         INIT_LIST_HEAD(&cfile->pin_list);
 323
 324         filp->private_data = cfile;
 325
 326         genwqe_add_file(cd, cfile);
 327         return 0;
 328 }
 329
 330 /**
 331  * genwqe_fasync() - Setup process to receive SIGIO.
 332  * @fd:        file descriptor
 333  * @filp:      file handle
 334  * @mode:      file mode
 335  *
 336  * Sending a signal is working as following:
 337  *
 338  * if (cdev->async_queue)
 339  *         kill_fasync(&cdev->async_queue, SIGIO, POLL_IN);
 340  *
 341  * Some devices also implement asynchronous notification to indicate
 342  * when the device can be written; in this case, of course,
 343  * kill_fasync must be called with a mode of POLL_OUT.
 344  */
 345 static int genwqe_fasync(int fd, struct file *filp, int mode)
 346 {
 347         struct genwqe_file *cdev = (struct genwqe_file *)filp->private_data;
 348
 349         return fasync_helper(fd, filp, mode, &cdev->async_queue);
 350 }
 351
 352
 353 /**
 354  * genwqe_release() - file close
 355  * @inode:      file system information
 356  * @filp:       file handle
 357  *
 358  * This function is executed whenever an application calls 'close(fd_genwqe)'
 359  *
 360  * Return: always 0
 361  */
 362 static int genwqe_release(struct inode *inode, struct file *filp)
 363 {
 364         struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
 365         struct genwqe_dev *cd = cfile->cd;
 366
 367         /* there must be no entries in these lists! */
 368         genwqe_remove_mappings(cfile);
 369         genwqe_remove_pinnings(cfile);
 370
 371         /* remove this filp from the asynchronously notified filp's */
 372         genwqe_fasync(-1, filp, 0);
 373
 374         /*
 375          * For this to work we must not release cd when this cfile is
 376          * not yet released, otherwise the list entry is invalid,
 377          * because the list itself gets reinstantiated!
 378          */
 379         genwqe_del_file(cd, cfile);
 380         kfree(cfile);
 381         return 0;
 382 }
 383
 384 static void genwqe_vma_open(struct vm_area_struct *vma)
 385 {
 386         /* nothing ... */
 387 }
 388
 389 /**
 390  * genwqe_vma_close() - Called each time when vma is unmapped
 391  *
 392  * Free memory which got allocated by GenWQE mmap().
 393  */
 394 static void genwqe_vma_close(struct vm_area_struct *vma)
 395 {
 396         unsigned long vsize = vma->vm_end - vma->vm_start;
 397         struct inode *inode = file_inode(vma->vm_file);
 398         struct dma_mapping *dma_map;
 399         struct genwqe_dev *cd = container_of(inode->i_cdev, struct genwqe_dev,
 400                                             cdev_genwqe);
 401         struct pci_dev *pci_dev = cd->pci_dev;
 402         dma_addr_t d_addr = 0;
 403         struct genwqe_file *cfile = vma->vm_private_data;
 404
 405         dma_map = __genwqe_search_mapping(cfile, vma->vm_start, vsize,
 406                                          &d_addr, NULL);
 407         if (dma_map == NULL) {
 408                 dev_err(&pci_dev->dev,
 409                         "  [%s] err: mapping not found: v=%lx, p=%lx s=%lx\n",
 410                         __func__, vma->vm_start, vma->vm_pgoff << PAGE_SHIFT,
 411                         vsize);
 412                 return;
 413         }
 414         __genwqe_del_mapping(cfile, dma_map);
 415         __genwqe_free_consistent(cd, dma_map->size, dma_map->k_vaddr,
 416                                  dma_map->dma_addr);
 417         kfree(dma_map);
 418 }
 419
 420 static const struct vm_operations_struct genwqe_vma_ops = {
 421         .open   = genwqe_vma_open,
 422         .close  = genwqe_vma_close,
 423 };
 424
 425 /**
 426  * genwqe_mmap() - Provide contignous buffers to userspace
 427  *
 428  * We use mmap() to allocate contignous buffers used for DMA
 429  * transfers. After the buffer is allocated we remap it to user-space
 430  * and remember a reference to our dma_mapping data structure, where
 431  * we store the associated DMA address and allocated size.
 432  *
 433  * When we receive a DDCB execution request with the ATS bits set to
 434  * plain buffer, we lookup our dma_mapping list to find the
 435  * corresponding DMA address for the associated user-space address.
 436  */
 437 static int genwqe_mmap(struct file *filp, struct vm_area_struct *vma)
 438 {
 439         int rc;
 440         unsigned long pfn, vsize = vma->vm_end - vma->vm_start;
 441         struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
 442         struct genwqe_dev *cd = cfile->cd;
 443         struct dma_mapping *dma_map;
 444
 445         if (vsize == 0)
 446                 return -EINVAL;
 447
 448         if (get_order(vsize) > MAX_ORDER)
 449                 return -ENOMEM;
 450
 451         dma_map = kzalloc(sizeof(struct dma_mapping), GFP_KERNEL);
 452         if (dma_map == NULL)
 453                 return -ENOMEM;
 454
 455         genwqe_mapping_init(dma_map, GENWQE_MAPPING_RAW);
 456         dma_map->u_vaddr = (void *)vma->vm_start;
 457         dma_map->size = vsize;
 458         dma_map->nr_pages = DIV_ROUND_UP(vsize, PAGE_SIZE);
 459         dma_map->k_vaddr = __genwqe_alloc_consistent(cd, vsize,
 460                                                      &dma_map->dma_addr);
 461         if (dma_map->k_vaddr == NULL) {
 462                 rc = -ENOMEM;
 463                 goto free_dma_map;
 464         }
 465
 466         if (capable(CAP_SYS_ADMIN) && (vsize > sizeof(dma_addr_t)))
 467                 *(dma_addr_t *)dma_map->k_vaddr = dma_map->dma_addr;
 468
 469         pfn = virt_to_phys(dma_map->k_vaddr) >> PAGE_SHIFT;
 470         rc = remap_pfn_range(vma,
 471                              vma->vm_start,
 472                              pfn,
 473                              vsize,
 474                              vma->vm_page_prot);
 475         if (rc != 0) {
 476                 rc = -EFAULT;
 477                 goto free_dma_mem;
 478         }
 479
 480         vma->vm_private_data = cfile;
 481         vma->vm_ops = &genwqe_vma_ops;
 482         __genwqe_add_mapping(cfile, dma_map);
 483
 484         return 0;
 485
 486  free_dma_mem:
 487         __genwqe_free_consistent(cd, dma_map->size,
 488                                 dma_map->k_vaddr,
 489                                 dma_map->dma_addr);
 490  free_dma_map:
 491         kfree(dma_map);
 492         return rc;
 493 }
 494
 495 /**
 496  * do_flash_update() - Excute flash update (write image or CVPD)
 497  * @cd:        genwqe device
 498  * @load:      details about image load
 499  *
 500  * Return: 0 if successful
 501  */
 502
 503 #define FLASH_BLOCK     0x40000 /* we use 256k blocks */
 504
 505 static int do_flash_update(struct genwqe_file *cfile,
 506                            struct genwqe_bitstream *load)
 507 {
 508         int rc = 0;
 509         int blocks_to_flash;
 510         dma_addr_t dma_addr;
 511         u64 flash = 0;
 512         size_t tocopy = 0;
 513         u8 __user *buf;
 514         u8 *xbuf;
 515         u32 crc;
 516         u8 cmdopts;
 517         struct genwqe_dev *cd = cfile->cd;
 518         struct file *filp = cfile->filp;
 519         struct pci_dev *pci_dev = cd->pci_dev;
 520
 521         if ((load->size & 0x3) != 0)
 522                 return -EINVAL;
 523
 524         if (((unsigned long)(load->data_addr) & ~PAGE_MASK) != 0)
 525                 return -EINVAL;
 526
 527         /* FIXME Bits have changed for new service layer! */
 528         switch ((char)load->partition) {
 529         case '0':
 530                 cmdopts = 0x14;
 531                 break;          /* download/erase_first/part_0 */
 532         case '1':
 533                 cmdopts = 0x1C;
 534                 break;          /* download/erase_first/part_1 */
 535         case 'v':
 536                 cmdopts = 0x0C;
 537                 break;          /* download/erase_first/vpd */
 538         default:
 539                 return -EINVAL;
 540         }
 541
 542         buf = (u8 __user *)load->data_addr;
 543         xbuf = __genwqe_alloc_consistent(cd, FLASH_BLOCK, &dma_addr);
 544         if (xbuf == NULL)
 545                 return -ENOMEM;
 546
 547         blocks_to_flash = load->size / FLASH_BLOCK;
 548         while (load->size) {
 549                 struct genwqe_ddcb_cmd *req;
 550
 551                 /*
 552                  * We must be 4 byte aligned. Buffer must be 0 appened
 553                  * to have defined values when calculating CRC.
 554                  */
 555                 tocopy = min_t(size_t, load->size, FLASH_BLOCK);
 556
 557                 rc = copy_from_user(xbuf, buf, tocopy);
 558                 if (rc) {
 559                         rc = -EFAULT;
 560                         goto free_buffer;
 561                 }
 562                 crc = genwqe_crc32(xbuf, tocopy, 0xffffffff);
 563
 564                 dev_dbg(&pci_dev->dev,
 565                         "[%s] DMA: %lx CRC: %08x SZ: %ld %d\n",
 566                         __func__, (unsigned long)dma_addr, crc, tocopy,
 567                         blocks_to_flash);
 568
 569                 /* prepare DDCB for SLU process */
 570                 req = ddcb_requ_alloc();
 571                 if (req == NULL) {
 572                         rc = -ENOMEM;
 573                         goto free_buffer;
 574                 }
 575
 576                 req->cmd = SLCMD_MOVE_FLASH;
 577                 req->cmdopts = cmdopts;
 578
 579                 /* prepare invariant values */
 580                 if (genwqe_get_slu_id(cd) <= 0x2) {
 581                         *(__be64 *)&req->__asiv[0]  = cpu_to_be64(dma_addr);
 582                         *(__be64 *)&req->__asiv[8]  = cpu_to_be64(tocopy);
 583                         *(__be64 *)&req->__asiv[16] = cpu_to_be64(flash);
 584                         *(__be32 *)&req->__asiv[24] = cpu_to_be32(0);
 585                         req->__asiv[24]        = load->uid;
 586                         *(__be32 *)&req->__asiv[28] = cpu_to_be32(crc);
 587
 588                         /* for simulation only */
 589                         *(__be64 *)&req->__asiv[88] = cpu_to_be64(load->slu_id);
 590                         *(__be64 *)&req->__asiv[96] = cpu_to_be64(load->app_id);
 591                         req->asiv_length = 32; /* bytes included in crc calc */
 592                 } else {        /* setup DDCB for ATS architecture */
 593                         *(__be64 *)&req->asiv[0]  = cpu_to_be64(dma_addr);
 594                         *(__be32 *)&req->asiv[8]  = cpu_to_be32(tocopy);
 595                         *(__be32 *)&req->asiv[12] = cpu_to_be32(0); /* resvd */
 596                         *(__be64 *)&req->asiv[16] = cpu_to_be64(flash);
 597                         *(__be32 *)&req->asiv[24] = cpu_to_be32(load->uid<<24);
 598                         *(__be32 *)&req->asiv[28] = cpu_to_be32(crc);
 599
 600                         /* for simulation only */
 601                         *(__be64 *)&req->asiv[80] = cpu_to_be64(load->slu_id);
 602                         *(__be64 *)&req->asiv[88] = cpu_to_be64(load->app_id);
 603
 604                         /* Rd only */
 605                         req->ats = 0x4ULL << 44;
 606                         req->asiv_length = 40; /* bytes included in crc calc */
 607                 }
 608                 req->asv_length  = 8;
 609
 610                 /* For Genwqe5 we get back the calculated CRC */
 611                 *(u64 *)&req->asv[0] = 0ULL;                    /* 0x80 */
 612
 613                 rc = __genwqe_execute_raw_ddcb(cd, req, filp->f_flags);
 614
 615                 load->retc = req->retc;
 616                 load->attn = req->attn;
 617                 load->progress = req->progress;
 618
 619                 if (rc < 0) {
 620                         ddcb_requ_free(req);
 621                         goto free_buffer;
 622                 }
 623
 624                 if (req->retc != DDCB_RETC_COMPLETE) {
 625                         rc = -EIO;
 626                         ddcb_requ_free(req);
 627                         goto free_buffer;
 628                 }
 629
 630                 load->size  -= tocopy;
 631                 flash += tocopy;
 632                 buf += tocopy;
 633                 blocks_to_flash--;
 634                 ddcb_requ_free(req);
 635         }
 636
 637  free_buffer:
 638         __genwqe_free_consistent(cd, FLASH_BLOCK, xbuf, dma_addr);
 639         return rc;
 640 }
 641
 642 static int do_flash_read(struct genwqe_file *cfile,
 643                          struct genwqe_bitstream *load)
 644 {
 645         int rc, blocks_to_flash;
 646         dma_addr_t dma_addr;
 647         u64 flash = 0;
 648         size_t tocopy = 0;
 649         u8 __user *buf;
 650         u8 *xbuf;
 651         u8 cmdopts;
 652         struct genwqe_dev *cd = cfile->cd;
 653         struct file *filp = cfile->filp;
 654         struct pci_dev *pci_dev = cd->pci_dev;
 655         struct genwqe_ddcb_cmd *cmd;
 656
 657         if ((load->size & 0x3) != 0)
 658                 return -EINVAL;
 659
 660         if (((unsigned long)(load->data_addr) & ~PAGE_MASK) != 0)
 661                 return -EINVAL;
 662
 663         /* FIXME Bits have changed for new service layer! */
 664         switch ((char)load->partition) {
 665         case '0':
 666                 cmdopts = 0x12;
 667                 break;          /* upload/part_0 */
 668         case '1':
 669                 cmdopts = 0x1A;
 670                 break;          /* upload/part_1 */
 671         case 'v':
 672                 cmdopts = 0x0A;
 673                 break;          /* upload/vpd */
 674         default:
 675                 return -EINVAL;
 676         }
 677
 678         buf = (u8 __user *)load->data_addr;
 679         xbuf = __genwqe_alloc_consistent(cd, FLASH_BLOCK, &dma_addr);
 680         if (xbuf == NULL)
 681                 return -ENOMEM;
 682
 683         blocks_to_flash = load->size / FLASH_BLOCK;
 684         while (load->size) {
 685                 /*
 686                  * We must be 4 byte aligned. Buffer must be 0 appened
 687                  * to have defined values when calculating CRC.
 688                  */
 689                 tocopy = min_t(size_t, load->size, FLASH_BLOCK);
 690
 691                 dev_dbg(&pci_dev->dev,
 692                         "[%s] DMA: %lx SZ: %ld %d\n",
 693                         __func__, (unsigned long)dma_addr, tocopy,
 694                         blocks_to_flash);
 695
 696                 /* prepare DDCB for SLU process */
 697                 cmd = ddcb_requ_alloc();
 698                 if (cmd == NULL) {
 699                         rc = -ENOMEM;
 700                         goto free_buffer;
 701                 }
 702                 cmd->cmd = SLCMD_MOVE_FLASH;
 703                 cmd->cmdopts = cmdopts;
 704
 705                 /* prepare invariant values */
 706                 if (genwqe_get_slu_id(cd) <= 0x2) {
 707                         *(__be64 *)&cmd->__asiv[0]  = cpu_to_be64(dma_addr);
 708                         *(__be64 *)&cmd->__asiv[8]  = cpu_to_be64(tocopy);
 709                         *(__be64 *)&cmd->__asiv[16] = cpu_to_be64(flash);
 710                         *(__be32 *)&cmd->__asiv[24] = cpu_to_be32(0);
 711                         cmd->__asiv[24] = load->uid;
 712                         *(__be32 *)&cmd->__asiv[28] = cpu_to_be32(0) /* CRC */;
 713                         cmd->asiv_length = 32; /* bytes included in crc calc */
 714                 } else {        /* setup DDCB for ATS architecture */
 715                         *(__be64 *)&cmd->asiv[0]  = cpu_to_be64(dma_addr);
 716                         *(__be32 *)&cmd->asiv[8]  = cpu_to_be32(tocopy);
 717                         *(__be32 *)&cmd->asiv[12] = cpu_to_be32(0); /* resvd */
 718                         *(__be64 *)&cmd->asiv[16] = cpu_to_be64(flash);
 719                         *(__be32 *)&cmd->asiv[24] = cpu_to_be32(load->uid<<24);
 720                         *(__be32 *)&cmd->asiv[28] = cpu_to_be32(0); /* CRC */
 721
 722                         /* rd/wr */
 723                         cmd->ats = 0x5ULL << 44;
 724                         cmd->asiv_length = 40; /* bytes included in crc calc */
 725                 }
 726                 cmd->asv_length  = 8;
 727
 728                 /* we only get back the calculated CRC */
 729                 *(u64 *)&cmd->asv[0] = 0ULL;    /* 0x80 */
 730
 731                 rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
 732
 733                 load->retc = cmd->retc;
 734                 load->attn = cmd->attn;
 735                 load->progress = cmd->progress;
 736
 737                 if ((rc < 0) && (rc != -EBADMSG)) {
 738                         ddcb_requ_free(cmd);
 739                         goto free_buffer;
 740                 }
 741
 742                 rc = copy_to_user(buf, xbuf, tocopy);
 743                 if (rc) {
 744                         rc = -EFAULT;
 745                         ddcb_requ_free(cmd);
 746                         goto free_buffer;
 747                 }
 748
 749                 /* We know that we can get retc 0x104 with CRC err */
 750                 if (((cmd->retc == DDCB_RETC_FAULT) &&
 751                      (cmd->attn != 0x02)) ||  /* Normally ignore CRC error */
 752                     ((cmd->retc == DDCB_RETC_COMPLETE) &&
 753                      (cmd->attn != 0x00))) {  /* Everything was fine */
 754                         rc = -EIO;
 755                         ddcb_requ_free(cmd);
 756                         goto free_buffer;
 757                 }
 758
 759                 load->size  -= tocopy;
 760                 flash += tocopy;
 761                 buf += tocopy;
 762                 blocks_to_flash--;
 763                 ddcb_requ_free(cmd);
 764         }
 765         rc = 0;
 766
 767  free_buffer:
 768         __genwqe_free_consistent(cd, FLASH_BLOCK, xbuf, dma_addr);
 769         return rc;
 770 }
 771
 772 static int genwqe_pin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
 773 {
 774         int rc;
 775         struct genwqe_dev *cd = cfile->cd;
 776         struct pci_dev *pci_dev = cfile->cd->pci_dev;
 777         struct dma_mapping *dma_map;
 778         unsigned long map_addr;
 779         unsigned long map_size;
 780
 781         if ((m->addr == 0x0) || (m->size == 0))
 782                 return -EINVAL;
 783
 784         map_addr = (m->addr & PAGE_MASK);
 785         map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
 786
 787         dma_map = kzalloc(sizeof(struct dma_mapping), GFP_KERNEL);
 788         if (dma_map == NULL)
 789                 return -ENOMEM;
 790
 791         genwqe_mapping_init(dma_map, GENWQE_MAPPING_SGL_PINNED);
 792         rc = genwqe_user_vmap(cd, dma_map, (void *)map_addr, map_size);
 793         if (rc != 0) {
 794                 dev_err(&pci_dev->dev,
 795                         "[%s] genwqe_user_vmap rc=%d\n", __func__, rc);
 796                 kfree(dma_map);
 797                 return rc;
 798         }
 799
 800         genwqe_add_pin(cfile, dma_map);
 801         return 0;
 802 }
 803
 804 static int genwqe_unpin_mem(struct genwqe_file *cfile, struct genwqe_mem *m)
 805 {
 806         struct genwqe_dev *cd = cfile->cd;
 807         struct dma_mapping *dma_map;
 808         unsigned long map_addr;
 809         unsigned long map_size;
 810
 811         if (m->addr == 0x0)
 812                 return -EINVAL;
 813
 814         map_addr = (m->addr & PAGE_MASK);
 815         map_size = round_up(m->size + (m->addr & ~PAGE_MASK), PAGE_SIZE);
 816
 817         dma_map = genwqe_search_pin(cfile, map_addr, map_size, NULL);
 818         if (dma_map == NULL)
 819                 return -ENOENT;
 820
 821         genwqe_del_pin(cfile, dma_map);
 822         genwqe_user_vunmap(cd, dma_map);
 823         kfree(dma_map);
 824         return 0;
 825 }
 826
 827 /**
 828  * ddcb_cmd_cleanup() - Remove dynamically created fixup entries
 829  *
 830  * Only if there are any. Pinnings are not removed.
 831  */
 832 static int ddcb_cmd_cleanup(struct genwqe_file *cfile, struct ddcb_requ *req)
 833 {
 834         unsigned int i;
 835         struct dma_mapping *dma_map;
 836         struct genwqe_dev *cd = cfile->cd;
 837
 838         for (i = 0; i < DDCB_FIXUPS; i++) {
 839                 dma_map = &req->dma_mappings[i];
 840
 841                 if (dma_mapping_used(dma_map)) {
 842                         __genwqe_del_mapping(cfile, dma_map);
 843                         genwqe_user_vunmap(cd, dma_map);
 844                 }
 845                 if (req->sgls[i].sgl != NULL)
 846                         genwqe_free_sync_sgl(cd, &req->sgls[i]);
 847         }
 848         return 0;
 849 }
 850
 851 /**
 852  * ddcb_cmd_fixups() - Establish DMA fixups/sglists for user memory references
 853  *
 854  * Before the DDCB gets executed we need to handle the fixups. We
 855  * replace the user-space addresses with DMA addresses or do
 856  * additional setup work e.g. generating a scatter-gather list which
 857  * is used to describe the memory referred to in the fixup.
 858  */
 859 static int ddcb_cmd_fixups(struct genwqe_file *cfile, struct ddcb_requ *req)
 860 {
 861         int rc;
 862         unsigned int asiv_offs, i;
 863         struct genwqe_dev *cd = cfile->cd;
 864         struct genwqe_ddcb_cmd *cmd = &req->cmd;
 865         struct dma_mapping *m;
 866
 867         for (i = 0, asiv_offs = 0x00; asiv_offs <= 0x58;
 868              i++, asiv_offs += 0x08) {
 869
 870                 u64 u_addr;
 871                 dma_addr_t d_addr;
 872                 u32 u_size = 0;
 873                 u64 ats_flags;
 874
 875                 ats_flags = ATS_GET_FLAGS(cmd->ats, asiv_offs);
 876
 877                 switch (ats_flags) {
 878
 879                 case ATS_TYPE_DATA:
 880                         break;  /* nothing to do here */
 881
 882                 case ATS_TYPE_FLAT_RDWR:
 883                 case ATS_TYPE_FLAT_RD: {
 884                         u_addr = be64_to_cpu(*((__be64 *)&cmd->
 885                                                asiv[asiv_offs]));
 886                         u_size = be32_to_cpu(*((__be32 *)&cmd->
 887                                                asiv[asiv_offs + 0x08]));
 888
 889                         /*
 890                          * No data available. Ignore u_addr in this
 891                          * case and set addr to 0. Hardware must not
 892                          * fetch the buffer.
 893                          */
 894                         if (u_size == 0x0) {
 895                                 *((__be64 *)&cmd->asiv[asiv_offs]) =
 896                                         cpu_to_be64(0x0);
 897                                 break;
 898                         }
 899
 900                         m = __genwqe_search_mapping(cfile, u_addr, u_size,
 901                                                    &d_addr, NULL);
 902                         if (m == NULL) {
 903                                 rc = -EFAULT;
 904                                 goto err_out;
 905                         }
 906
 907                         *((__be64 *)&cmd->asiv[asiv_offs]) =
 908                                 cpu_to_be64(d_addr);
 909                         break;
 910                 }
 911
 912                 case ATS_TYPE_SGL_RDWR:
 913                 case ATS_TYPE_SGL_RD: {
 914                         int page_offs;
 915
 916                         u_addr = be64_to_cpu(*((__be64 *)
 917                                                &cmd->asiv[asiv_offs]));
 918                         u_size = be32_to_cpu(*((__be32 *)
 919                                                &cmd->asiv[asiv_offs + 0x08]));
 920
 921                         /*
 922                          * No data available. Ignore u_addr in this
 923                          * case and set addr to 0. Hardware must not
 924                          * fetch the empty sgl.
 925                          */
 926                         if (u_size == 0x0) {
 927                                 *((__be64 *)&cmd->asiv[asiv_offs]) =
 928                                         cpu_to_be64(0x0);
 929                                 break;
 930                         }
 931
 932                         m = genwqe_search_pin(cfile, u_addr, u_size, NULL);
 933                         if (m != NULL) {
 934                                 page_offs = (u_addr -
 935                                              (u64)m->u_vaddr)/PAGE_SIZE;
 936                         } else {
 937                                 m = &req->dma_mappings[i];
 938
 939                                 genwqe_mapping_init(m,
 940                                                     GENWQE_MAPPING_SGL_TEMP);
 941
 942                                 if (ats_flags == ATS_TYPE_SGL_RD)
 943                                         m->write = 0;
 944
 945                                 rc = genwqe_user_vmap(cd, m, (void *)u_addr,
 946                                                       u_size);
 947                                 if (rc != 0)
 948                                         goto err_out;
 949
 950                                 __genwqe_add_mapping(cfile, m);
 951                                 page_offs = 0;
 952                         }
 953
 954                         /* create genwqe style scatter gather list */
 955                         rc = genwqe_alloc_sync_sgl(cd, &req->sgls[i],
 956                                                    (void __user *)u_addr,
 957                                                    u_size, m->write);
 958                         if (rc != 0)
 959                                 goto err_out;
 960
 961                         genwqe_setup_sgl(cd, &req->sgls[i],
 962                                          &m->dma_list[page_offs]);
 963
 964                         *((__be64 *)&cmd->asiv[asiv_offs]) =
 965                                 cpu_to_be64(req->sgls[i].sgl_dma_addr);
 966
 967                         break;
 968                 }
 969                 default:
 970                         rc = -EINVAL;
 971                         goto err_out;
 972                 }
 973         }
 974         return 0;
 975
 976  err_out:
 977         ddcb_cmd_cleanup(cfile, req);
 978         return rc;
 979 }
 980
 981 /**
 982  * genwqe_execute_ddcb() - Execute DDCB using userspace address fixups
 983  *
 984  * The code will build up the translation tables or lookup the
 985  * contignous memory allocation table to find the right translations
 986  * and DMA addresses.
 987  */
 988 static int genwqe_execute_ddcb(struct genwqe_file *cfile,
 989                                struct genwqe_ddcb_cmd *cmd)
 990 {
 991         int rc;
 992         struct genwqe_dev *cd = cfile->cd;
 993         struct file *filp = cfile->filp;
 994         struct ddcb_requ *req = container_of(cmd, struct ddcb_requ, cmd);
 995
 996         rc = ddcb_cmd_fixups(cfile, req);
 997         if (rc != 0)
 998                 return rc;
 999
1000         rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
1001         ddcb_cmd_cleanup(cfile, req);
1002         return rc;
1003 }
1004
1005 static int do_execute_ddcb(struct genwqe_file *cfile,
1006                            unsigned long arg, int raw)
1007 {
1008         int rc;
1009         struct genwqe_ddcb_cmd *cmd;
1010         struct genwqe_dev *cd = cfile->cd;
1011         struct file *filp = cfile->filp;
1012
1013         cmd = ddcb_requ_alloc();
1014         if (cmd == NULL)
1015                 return -ENOMEM;
1016
1017         if (copy_from_user(cmd, (void __user *)arg, sizeof(*cmd))) {
1018                 ddcb_requ_free(cmd);
1019                 return -EFAULT;
1020         }
1021
1022         if (!raw)
1023                 rc = genwqe_execute_ddcb(cfile, cmd);
1024         else
1025                 rc = __genwqe_execute_raw_ddcb(cd, cmd, filp->f_flags);
1026
1027         /* Copy back only the modifed fields. Do not copy ASIV
1028            back since the copy got modified by the driver. */
1029         if (copy_to_user((void __user *)arg, cmd,
1030                          sizeof(*cmd) - DDCB_ASIV_LENGTH)) {
1031                 ddcb_requ_free(cmd);
1032                 return -EFAULT;
1033         }
1034
1035         ddcb_requ_free(cmd);
1036         return rc;
1037 }
1038
1039 /**
1040  * genwqe_ioctl() - IO control
1041  * @filp:       file handle
1042  * @cmd:        command identifier (passed from user)
1043  * @arg:        argument (passed from user)
1044  *
1045  * Return: 0 success
1046  */
1047 static long genwqe_ioctl(struct file *filp, unsigned int cmd,
1048                          unsigned long arg)
1049 {
1050         int rc = 0;
1051         struct genwqe_file *cfile = (struct genwqe_file *)filp->private_data;
1052         struct genwqe_dev *cd = cfile->cd;
1053         struct pci_dev *pci_dev = cd->pci_dev;
1054         struct genwqe_reg_io __user *io;
1055         u64 val;
1056         u32 reg_offs;
1057
1058         /* Return -EIO if card hit EEH */
1059         if (pci_channel_offline(pci_dev))
1060                 return -EIO;
1061
1062         if (_IOC_TYPE(cmd) != GENWQE_IOC_CODE)
1063                 return -EINVAL;
1064
1065         switch (cmd) {
1066
1067         case GENWQE_GET_CARD_STATE:
1068                 put_user(cd->card_state, (enum genwqe_card_state __user *)arg);
1069                 return 0;
1070
1071                 /* Register access */
1072         case GENWQE_READ_REG64: {
1073                 io = (struct genwqe_reg_io __user *)arg;
1074
1075                 if (get_user(reg_offs, &io->num))
1076                         return -EFAULT;
1077
1078                 if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
1079                         return -EINVAL;
1080
1081                 val = __genwqe_readq(cd, reg_offs);
1082                 put_user(val, &io->val64);
1083                 return 0;
1084         }
1085
1086         case GENWQE_WRITE_REG64: {
1087                 io = (struct genwqe_reg_io __user *)arg;
1088
1089                 if (!capable(CAP_SYS_ADMIN))
1090                         return -EPERM;
1091
1092                 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1093                         return -EPERM;
1094
1095                 if (get_user(reg_offs, &io->num))
1096                         return -EFAULT;
1097
1098                 if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x7))
1099                         return -EINVAL;
1100
1101                 if (get_user(val, &io->val64))
1102                         return -EFAULT;
1103
1104                 __genwqe_writeq(cd, reg_offs, val);
1105                 return 0;
1106         }
1107
1108         case GENWQE_READ_REG32: {
1109                 io = (struct genwqe_reg_io __user *)arg;
1110
1111                 if (get_user(reg_offs, &io->num))
1112                         return -EFAULT;
1113
1114                 if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
1115                         return -EINVAL;
1116
1117                 val = __genwqe_readl(cd, reg_offs);
1118                 put_user(val, &io->val64);
1119                 return 0;
1120         }
1121
1122         case GENWQE_WRITE_REG32: {
1123                 io = (struct genwqe_reg_io __user *)arg;
1124
1125                 if (!capable(CAP_SYS_ADMIN))
1126                         return -EPERM;
1127
1128                 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1129                         return -EPERM;
1130
1131                 if (get_user(reg_offs, &io->num))
1132                         return -EFAULT;
1133
1134                 if ((reg_offs >= cd->mmio_len) || (reg_offs & 0x3))
1135                         return -EINVAL;
1136
1137                 if (get_user(val, &io->val64))
1138                         return -EFAULT;
1139
1140                 __genwqe_writel(cd, reg_offs, val);
1141                 return 0;
1142         }
1143
1144                 /* Flash update/reading */
1145         case GENWQE_SLU_UPDATE: {
1146                 struct genwqe_bitstream load;
1147
1148                 if (!genwqe_is_privileged(cd))
1149                         return -EPERM;
1150
1151                 if ((filp->f_flags & O_ACCMODE) == O_RDONLY)
1152                         return -EPERM;
1153
1154                 if (copy_from_user(&load, (void __user *)arg,
1155                                    sizeof(load)))
1156                         return -EFAULT;
1157
1158                 rc = do_flash_update(cfile, &load);
1159
1160                 if (copy_to_user((void __user *)arg, &load, sizeof(load)))
1161                         return -EFAULT;
1162
1163                 return rc;
1164         }
1165
1166         case GENWQE_SLU_READ: {
1167                 struct genwqe_bitstream load;
1168
1169                 if (!genwqe_is_privileged(cd))
1170                         return -EPERM;
1171
1172                 if (genwqe_flash_readback_fails(cd))
1173                         return -ENOSPC;  /* known to fail for old versions */
1174
1175                 if (copy_from_user(&load, (void __user *)arg, sizeof(load)))
1176                         return -EFAULT;
1177
1178                 rc = do_flash_read(cfile, &load);
1179
1180                 if (copy_to_user((void __user *)arg, &load, sizeof(load)))
1181                         return -EFAULT;
1182
1183                 return rc;
1184         }
1185
1186                 /* memory pinning and unpinning */
1187         case GENWQE_PIN_MEM: {
1188                 struct genwqe_mem m;
1189
1190                 if (copy_from_user(&m, (void __user *)arg, sizeof(m)))
1191                         return -EFAULT;
1192
1193                 return genwqe_pin_mem(cfile, &m);
1194         }
1195
1196         case GENWQE_UNPIN_MEM: {
1197                 struct genwqe_mem m;
1198
1199                 if (copy_from_user(&m, (void __user *)arg, sizeof(m)))
1200                         return -EFAULT;
1201
1202                 return genwqe_unpin_mem(cfile, &m);
1203         }
1204
1205                 /* launch an DDCB and wait for completion */
1206         case GENWQE_EXECUTE_DDCB:
1207                 return do_execute_ddcb(cfile, arg, 0);
1208
1209         case GENWQE_EXECUTE_RAW_DDCB: {
1210
1211                 if (!capable(CAP_SYS_ADMIN))
1212                         return -EPERM;
1213
1214                 return do_execute_ddcb(cfile, arg, 1);
1215         }
1216
1217         default:
1218                 return -EINVAL;
1219         }
1220
1221         return rc;
1222 }
1223
1224 #if defined(CONFIG_COMPAT)
1225 /**
1226  * genwqe_compat_ioctl() - Compatibility ioctl
1227  *
1228  * Called whenever a 32-bit process running under a 64-bit kernel
1229  * performs an ioctl on /dev/genwqe<n>_card.
1230  *
1231  * @filp:        file pointer.
1232  * @cmd:         command.
1233  * @arg:         user argument.
1234  * Return:       zero on success or negative number on failure.
1235  */
1236 static long genwqe_compat_ioctl(struct file *filp, unsigned int cmd,
1237                                 unsigned long arg)
1238 {
1239         return genwqe_ioctl(filp, cmd, arg);
1240 }
1241 #endif /* defined(CONFIG_COMPAT) */
1242
1243 static const struct file_operations genwqe_fops = {
1244         .owner          = THIS_MODULE,
1245         .open           = genwqe_open,
1246         .fasync         = genwqe_fasync,
1247         .mmap           = genwqe_mmap,
1248         .unlocked_ioctl = genwqe_ioctl,
1249 #if defined(CONFIG_COMPAT)
1250         .compat_ioctl   = genwqe_compat_ioctl,
1251 #endif
1252         .release        = genwqe_release,
1253 };
1254
1255 static int genwqe_device_initialized(struct genwqe_dev *cd)
1256 {
1257         return cd->dev != NULL;
1258 }
1259
1260 /**
1261  * genwqe_device_create() - Create and configure genwqe char device
1262  * @cd:      genwqe device descriptor
1263  *
1264  * This function must be called before we create any more genwqe
1265  * character devices, because it is allocating the major and minor
1266  * number which are supposed to be used by the client drivers.
1267  */
1268 int genwqe_device_create(struct genwqe_dev *cd)
1269 {
1270         int rc;
1271         struct pci_dev *pci_dev = cd->pci_dev;
1272
1273         /*
1274          * Here starts the individual setup per client. It must
1275          * initialize its own cdev data structure with its own fops.
1276          * The appropriate devnum needs to be created. The ranges must
1277          * not overlap.
1278          */
1279         rc = alloc_chrdev_region(&cd->devnum_genwqe, 0,
1280                                  GENWQE_MAX_MINOR, GENWQE_DEVNAME);
1281         if (rc < 0) {
1282                 dev_err(&pci_dev->dev, "err: alloc_chrdev_region failed\n");
1283                 goto err_dev;
1284         }
1285
1286         cdev_init(&cd->cdev_genwqe, &genwqe_fops);
1287         cd->cdev_genwqe.owner = THIS_MODULE;
1288
1289         rc = cdev_add(&cd->cdev_genwqe, cd->devnum_genwqe, 1);
1290         if (rc < 0) {
1291                 dev_err(&pci_dev->dev, "err: cdev_add failed\n");
1292                 goto err_add;
1293         }
1294
1295         /*
1296          * Finally the device in /dev/... must be created. The rule is
1297          * to use card%d_clientname for each created device.
1298          */
1299         cd->dev = device_create_with_groups(cd->class_genwqe,
1300                                             &cd->pci_dev->dev,
1301                                             cd->devnum_genwqe, cd,
1302                                             genwqe_attribute_groups,
1303                                             GENWQE_DEVNAME "%u_card",
1304                                             cd->card_idx);
1305         if (IS_ERR(cd->dev)) {
1306                 rc = PTR_ERR(cd->dev);
1307                 goto err_cdev;
1308         }
1309
1310         rc = genwqe_init_debugfs(cd);
1311         if (rc != 0)
1312                 goto err_debugfs;
1313
1314         return 0;
1315
1316  err_debugfs:
1317         device_destroy(cd->class_genwqe, cd->devnum_genwqe);
1318  err_cdev:
1319         cdev_del(&cd->cdev_genwqe);
1320  err_add:
1321         unregister_chrdev_region(cd->devnum_genwqe, GENWQE_MAX_MINOR);
1322  err_dev:
1323         cd->dev = NULL;
1324         return rc;
1325 }
1326
1327 static int genwqe_inform_and_stop_processes(struct genwqe_dev *cd)
1328 {
1329         int rc;
1330         unsigned int i;
1331         struct pci_dev *pci_dev = cd->pci_dev;
1332
1333         if (!genwqe_open_files(cd))
1334                 return 0;
1335
1336         dev_warn(&pci_dev->dev, "[%s] send SIGIO and wait ...\n", __func__);
1337
1338         rc = genwqe_kill_fasync(cd, SIGIO);
1339         if (rc > 0) {
1340                 /* give kill_timeout seconds to close file descriptors ... */
1341                 for (i = 0; (i < GENWQE_KILL_TIMEOUT) &&
1342                              genwqe_open_files(cd); i++) {
1343                         dev_info(&pci_dev->dev, "  %d sec ...", i);
1344
1345                         cond_resched();
1346                         msleep(1000);
1347                 }
1348
1349                 /* if no open files we can safely continue, else ... */
1350                 if (!genwqe_open_files(cd))
1351                         return 0;
1352
1353                 dev_warn(&pci_dev->dev,
1354                          "[%s] send SIGKILL and wait ...\n", __func__);
1355
1356                 rc = genwqe_terminate(cd);
1357                 if (rc) {
1358                         /* Give kill_timout more seconds to end processes */
1359                         for (i = 0; (i < GENWQE_KILL_TIMEOUT) &&
1360                                      genwqe_open_files(cd); i++) {
1361                                 dev_warn(&pci_dev->dev, "  %d sec ...", i);
1362
1363                                 cond_resched();
1364                                 msleep(1000);
1365                         }
1366                 }
1367         }
1368         return 0;
1369 }
1370
1371 /**
1372  * genwqe_device_remove() - Remove genwqe's char device
1373  *
1374  * This function must be called after the client devices are removed
1375  * because it will free the major/minor number range for the genwqe
1376  * drivers.
1377  *
1378  * This function must be robust enough to be called twice.
1379  */
1380 int genwqe_device_remove(struct genwqe_dev *cd)
1381 {
1382         int rc;
1383         struct pci_dev *pci_dev = cd->pci_dev;
1384
1385         if (!genwqe_device_initialized(cd))
1386                 return 1;
1387
1388         genwqe_inform_and_stop_processes(cd);
1389
1390         /*
1391          * We currently do wait until all filedescriptors are
1392          * closed. This leads to a problem when we abort the
1393          * application which will decrease this reference from
1394          * 1/unused to 0/illegal and not from 2/used 1/empty.
1395          */
1396         rc = kref_read(&cd->cdev_genwqe.kobj.kref);
1397         if (rc != 1) {
1398                 dev_err(&pci_dev->dev,
1399                         "[%s] err: cdev_genwqe...refcount=%d\n", __func__, rc);
1400                 panic("Fatal err: cannot free resources with pending references!");
1401         }
1402
1403         genqwe_exit_debugfs(cd);
1404         device_destroy(cd->class_genwqe, cd->devnum_genwqe);
1405         cdev_del(&cd->cdev_genwqe);
1406         unregister_chrdev_region(cd->devnum_genwqe, GENWQE_MAX_MINOR);
1407         cd->dev = NULL;
1408
1409         return 0;
1410 }