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