root/drivers/misc/cxl/file.c

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DEFINITIONS

This source file includes following definitions.
  1. __afu_open
  2. afu_open
  3. afu_master_open
  4. afu_release
  5. afu_ioctl_start_work
  6. afu_ioctl_process_element
  7. afu_ioctl_get_afu_id
  8. afu_ioctl
  9. afu_compat_ioctl
  10. afu_mmap
  11. ctx_event_pending
  12. afu_poll
  13. afu_driver_event_copy
  14. afu_read
  15. cxl_devnode
  16. cxl_add_chardev
  17. cxl_chardev_d_afu_add
  18. cxl_chardev_m_afu_add
  19. cxl_chardev_s_afu_add
  20. cxl_chardev_afu_remove
  21. cxl_register_afu
  22. cxl_register_adapter
  23. cxl_get_dev
  24. cxl_file_init
  25. cxl_file_exit

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2014 IBM Corp.
   4  */
   5 
   6 #include <linux/spinlock.h>
   7 #include <linux/module.h>
   8 #include <linux/export.h>
   9 #include <linux/kernel.h>
  10 #include <linux/bitmap.h>
  11 #include <linux/sched/signal.h>
  12 #include <linux/poll.h>
  13 #include <linux/pid.h>
  14 #include <linux/fs.h>
  15 #include <linux/mm.h>
  16 #include <linux/slab.h>
  17 #include <linux/sched/mm.h>
  18 #include <linux/mmu_context.h>
  19 #include <asm/cputable.h>
  20 #include <asm/current.h>
  21 #include <asm/copro.h>
  22 
  23 #include "cxl.h"
  24 #include "trace.h"
  25 
  26 #define CXL_NUM_MINORS 256 /* Total to reserve */
  27 
  28 #define CXL_AFU_MINOR_D(afu) (CXL_CARD_MINOR(afu->adapter) + 1 + (3 * afu->slice))
  29 #define CXL_AFU_MINOR_M(afu) (CXL_AFU_MINOR_D(afu) + 1)
  30 #define CXL_AFU_MINOR_S(afu) (CXL_AFU_MINOR_D(afu) + 2)
  31 #define CXL_AFU_MKDEV_D(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_D(afu))
  32 #define CXL_AFU_MKDEV_M(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_M(afu))
  33 #define CXL_AFU_MKDEV_S(afu) MKDEV(MAJOR(cxl_dev), CXL_AFU_MINOR_S(afu))
  34 
  35 #define CXL_DEVT_AFU(dev) ((MINOR(dev) % CXL_DEV_MINORS - 1) / 3)
  36 
  37 #define CXL_DEVT_IS_CARD(dev) (MINOR(dev) % CXL_DEV_MINORS == 0)
  38 
  39 static dev_t cxl_dev;
  40 
  41 static struct class *cxl_class;
  42 
  43 static int __afu_open(struct inode *inode, struct file *file, bool master)
  44 {
  45         struct cxl *adapter;
  46         struct cxl_afu *afu;
  47         struct cxl_context *ctx;
  48         int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev);
  49         int slice = CXL_DEVT_AFU(inode->i_rdev);
  50         int rc = -ENODEV;
  51 
  52         pr_devel("afu_open afu%i.%i\n", slice, adapter_num);
  53 
  54         if (!(adapter = get_cxl_adapter(adapter_num)))
  55                 return -ENODEV;
  56 
  57         if (slice > adapter->slices)
  58                 goto err_put_adapter;
  59 
  60         spin_lock(&adapter->afu_list_lock);
  61         if (!(afu = adapter->afu[slice])) {
  62                 spin_unlock(&adapter->afu_list_lock);
  63                 goto err_put_adapter;
  64         }
  65 
  66         /*
  67          * taking a ref to the afu so that it doesn't go away
  68          * for rest of the function. This ref is released before
  69          * we return.
  70          */
  71         cxl_afu_get(afu);
  72         spin_unlock(&adapter->afu_list_lock);
  73 
  74         if (!afu->current_mode)
  75                 goto err_put_afu;
  76 
  77         if (!cxl_ops->link_ok(adapter, afu)) {
  78                 rc = -EIO;
  79                 goto err_put_afu;
  80         }
  81 
  82         if (!(ctx = cxl_context_alloc())) {
  83                 rc = -ENOMEM;
  84                 goto err_put_afu;
  85         }
  86 
  87         rc = cxl_context_init(ctx, afu, master);
  88         if (rc)
  89                 goto err_put_afu;
  90 
  91         cxl_context_set_mapping(ctx, inode->i_mapping);
  92 
  93         pr_devel("afu_open pe: %i\n", ctx->pe);
  94         file->private_data = ctx;
  95 
  96         /* indicate success */
  97         rc = 0;
  98 
  99 err_put_afu:
 100         /* release the ref taken earlier */
 101         cxl_afu_put(afu);
 102 err_put_adapter:
 103         put_device(&adapter->dev);
 104         return rc;
 105 }
 106 
 107 int afu_open(struct inode *inode, struct file *file)
 108 {
 109         return __afu_open(inode, file, false);
 110 }
 111 
 112 static int afu_master_open(struct inode *inode, struct file *file)
 113 {
 114         return __afu_open(inode, file, true);
 115 }
 116 
 117 int afu_release(struct inode *inode, struct file *file)
 118 {
 119         struct cxl_context *ctx = file->private_data;
 120 
 121         pr_devel("%s: closing cxl file descriptor. pe: %i\n",
 122                  __func__, ctx->pe);
 123         cxl_context_detach(ctx);
 124 
 125 
 126         /*
 127          * Delete the context's mapping pointer, unless it's created by the
 128          * kernel API, in which case leave it so it can be freed by reclaim_ctx()
 129          */
 130         if (!ctx->kernelapi) {
 131                 mutex_lock(&ctx->mapping_lock);
 132                 ctx->mapping = NULL;
 133                 mutex_unlock(&ctx->mapping_lock);
 134         }
 135 
 136         /*
 137          * At this this point all bottom halfs have finished and we should be
 138          * getting no more IRQs from the hardware for this context.  Once it's
 139          * removed from the IDR (and RCU synchronised) it's safe to free the
 140          * sstp and context.
 141          */
 142         cxl_context_free(ctx);
 143 
 144         return 0;
 145 }
 146 
 147 static long afu_ioctl_start_work(struct cxl_context *ctx,
 148                                  struct cxl_ioctl_start_work __user *uwork)
 149 {
 150         struct cxl_ioctl_start_work work;
 151         u64 amr = 0;
 152         int rc;
 153 
 154         pr_devel("%s: pe: %i\n", __func__, ctx->pe);
 155 
 156         /* Do this outside the status_mutex to avoid a circular dependency with
 157          * the locking in cxl_mmap_fault() */
 158         if (copy_from_user(&work, uwork, sizeof(work)))
 159                 return -EFAULT;
 160 
 161         mutex_lock(&ctx->status_mutex);
 162         if (ctx->status != OPENED) {
 163                 rc = -EIO;
 164                 goto out;
 165         }
 166 
 167         /*
 168          * if any of the reserved fields are set or any of the unused
 169          * flags are set it's invalid
 170          */
 171         if (work.reserved1 || work.reserved2 || work.reserved3 ||
 172             work.reserved4 || work.reserved5 ||
 173             (work.flags & ~CXL_START_WORK_ALL)) {
 174                 rc = -EINVAL;
 175                 goto out;
 176         }
 177 
 178         if (!(work.flags & CXL_START_WORK_NUM_IRQS))
 179                 work.num_interrupts = ctx->afu->pp_irqs;
 180         else if ((work.num_interrupts < ctx->afu->pp_irqs) ||
 181                  (work.num_interrupts > ctx->afu->irqs_max)) {
 182                 rc =  -EINVAL;
 183                 goto out;
 184         }
 185 
 186         if ((rc = afu_register_irqs(ctx, work.num_interrupts)))
 187                 goto out;
 188 
 189         if (work.flags & CXL_START_WORK_AMR)
 190                 amr = work.amr & mfspr(SPRN_UAMOR);
 191 
 192         if (work.flags & CXL_START_WORK_TID)
 193                 ctx->assign_tidr = true;
 194 
 195         ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF);
 196 
 197         /*
 198          * Increment the mapped context count for adapter. This also checks
 199          * if adapter_context_lock is taken.
 200          */
 201         rc = cxl_adapter_context_get(ctx->afu->adapter);
 202         if (rc) {
 203                 afu_release_irqs(ctx, ctx);
 204                 goto out;
 205         }
 206 
 207         /*
 208          * We grab the PID here and not in the file open to allow for the case
 209          * where a process (master, some daemon, etc) has opened the chardev on
 210          * behalf of another process, so the AFU's mm gets bound to the process
 211          * that performs this ioctl and not the process that opened the file.
 212          * Also we grab the PID of the group leader so that if the task that
 213          * has performed the attach operation exits the mm context of the
 214          * process is still accessible.
 215          */
 216         ctx->pid = get_task_pid(current, PIDTYPE_PID);
 217 
 218         /* acquire a reference to the task's mm */
 219         ctx->mm = get_task_mm(current);
 220 
 221         /* ensure this mm_struct can't be freed */
 222         cxl_context_mm_count_get(ctx);
 223 
 224         if (ctx->mm) {
 225                 /* decrement the use count from above */
 226                 mmput(ctx->mm);
 227                 /* make TLBIs for this context global */
 228                 mm_context_add_copro(ctx->mm);
 229         }
 230 
 231         /*
 232          * Increment driver use count. Enables global TLBIs for hash
 233          * and callbacks to handle the segment table
 234          */
 235         cxl_ctx_get();
 236 
 237         /*
 238          * A barrier is needed to make sure all TLBIs are global
 239          * before we attach and the context starts being used by the
 240          * adapter.
 241          *
 242          * Needed after mm_context_add_copro() for radix and
 243          * cxl_ctx_get() for hash/p8.
 244          *
 245          * The barrier should really be mb(), since it involves a
 246          * device. However, it's only useful when we have local
 247          * vs. global TLBIs, i.e SMP=y. So keep smp_mb().
 248          */
 249         smp_mb();
 250 
 251         trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr);
 252 
 253         if ((rc = cxl_ops->attach_process(ctx, false, work.work_element_descriptor,
 254                                                         amr))) {
 255                 afu_release_irqs(ctx, ctx);
 256                 cxl_adapter_context_put(ctx->afu->adapter);
 257                 put_pid(ctx->pid);
 258                 ctx->pid = NULL;
 259                 cxl_ctx_put();
 260                 cxl_context_mm_count_put(ctx);
 261                 if (ctx->mm)
 262                         mm_context_remove_copro(ctx->mm);
 263                 goto out;
 264         }
 265 
 266         rc = 0;
 267         if (work.flags & CXL_START_WORK_TID) {
 268                 work.tid = ctx->tidr;
 269                 if (copy_to_user(uwork, &work, sizeof(work)))
 270                         rc = -EFAULT;
 271         }
 272 
 273         ctx->status = STARTED;
 274 
 275 out:
 276         mutex_unlock(&ctx->status_mutex);
 277         return rc;
 278 }
 279 
 280 static long afu_ioctl_process_element(struct cxl_context *ctx,
 281                                       int __user *upe)
 282 {
 283         pr_devel("%s: pe: %i\n", __func__, ctx->pe);
 284 
 285         if (copy_to_user(upe, &ctx->external_pe, sizeof(__u32)))
 286                 return -EFAULT;
 287 
 288         return 0;
 289 }
 290 
 291 static long afu_ioctl_get_afu_id(struct cxl_context *ctx,
 292                                  struct cxl_afu_id __user *upafuid)
 293 {
 294         struct cxl_afu_id afuid = { 0 };
 295 
 296         afuid.card_id = ctx->afu->adapter->adapter_num;
 297         afuid.afu_offset = ctx->afu->slice;
 298         afuid.afu_mode = ctx->afu->current_mode;
 299 
 300         /* set the flag bit in case the afu is a slave */
 301         if (ctx->afu->current_mode == CXL_MODE_DIRECTED && !ctx->master)
 302                 afuid.flags |= CXL_AFUID_FLAG_SLAVE;
 303 
 304         if (copy_to_user(upafuid, &afuid, sizeof(afuid)))
 305                 return -EFAULT;
 306 
 307         return 0;
 308 }
 309 
 310 long afu_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 311 {
 312         struct cxl_context *ctx = file->private_data;
 313 
 314         if (ctx->status == CLOSED)
 315                 return -EIO;
 316 
 317         if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
 318                 return -EIO;
 319 
 320         pr_devel("afu_ioctl\n");
 321         switch (cmd) {
 322         case CXL_IOCTL_START_WORK:
 323                 return afu_ioctl_start_work(ctx, (struct cxl_ioctl_start_work __user *)arg);
 324         case CXL_IOCTL_GET_PROCESS_ELEMENT:
 325                 return afu_ioctl_process_element(ctx, (__u32 __user *)arg);
 326         case CXL_IOCTL_GET_AFU_ID:
 327                 return afu_ioctl_get_afu_id(ctx, (struct cxl_afu_id __user *)
 328                                             arg);
 329         }
 330         return -EINVAL;
 331 }
 332 
 333 static long afu_compat_ioctl(struct file *file, unsigned int cmd,
 334                              unsigned long arg)
 335 {
 336         return afu_ioctl(file, cmd, arg);
 337 }
 338 
 339 int afu_mmap(struct file *file, struct vm_area_struct *vm)
 340 {
 341         struct cxl_context *ctx = file->private_data;
 342 
 343         /* AFU must be started before we can MMIO */
 344         if (ctx->status != STARTED)
 345                 return -EIO;
 346 
 347         if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
 348                 return -EIO;
 349 
 350         return cxl_context_iomap(ctx, vm);
 351 }
 352 
 353 static inline bool ctx_event_pending(struct cxl_context *ctx)
 354 {
 355         if (ctx->pending_irq || ctx->pending_fault || ctx->pending_afu_err)
 356                 return true;
 357 
 358         if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events))
 359                 return true;
 360 
 361         return false;
 362 }
 363 
 364 __poll_t afu_poll(struct file *file, struct poll_table_struct *poll)
 365 {
 366         struct cxl_context *ctx = file->private_data;
 367         __poll_t mask = 0;
 368         unsigned long flags;
 369 
 370 
 371         poll_wait(file, &ctx->wq, poll);
 372 
 373         pr_devel("afu_poll wait done pe: %i\n", ctx->pe);
 374 
 375         spin_lock_irqsave(&ctx->lock, flags);
 376         if (ctx_event_pending(ctx))
 377                 mask |= EPOLLIN | EPOLLRDNORM;
 378         else if (ctx->status == CLOSED)
 379                 /* Only error on closed when there are no futher events pending
 380                  */
 381                 mask |= EPOLLERR;
 382         spin_unlock_irqrestore(&ctx->lock, flags);
 383 
 384         pr_devel("afu_poll pe: %i returning %#x\n", ctx->pe, mask);
 385 
 386         return mask;
 387 }
 388 
 389 static ssize_t afu_driver_event_copy(struct cxl_context *ctx,
 390                                      char __user *buf,
 391                                      struct cxl_event *event,
 392                                      struct cxl_event_afu_driver_reserved *pl)
 393 {
 394         /* Check event */
 395         if (!pl) {
 396                 ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL);
 397                 return -EFAULT;
 398         }
 399 
 400         /* Check event size */
 401         event->header.size += pl->data_size;
 402         if (event->header.size > CXL_READ_MIN_SIZE) {
 403                 ctx->afu_driver_ops->event_delivered(ctx, pl, -EINVAL);
 404                 return -EFAULT;
 405         }
 406 
 407         /* Copy event header */
 408         if (copy_to_user(buf, event, sizeof(struct cxl_event_header))) {
 409                 ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT);
 410                 return -EFAULT;
 411         }
 412 
 413         /* Copy event data */
 414         buf += sizeof(struct cxl_event_header);
 415         if (copy_to_user(buf, &pl->data, pl->data_size)) {
 416                 ctx->afu_driver_ops->event_delivered(ctx, pl, -EFAULT);
 417                 return -EFAULT;
 418         }
 419 
 420         ctx->afu_driver_ops->event_delivered(ctx, pl, 0); /* Success */
 421         return event->header.size;
 422 }
 423 
 424 ssize_t afu_read(struct file *file, char __user *buf, size_t count,
 425                         loff_t *off)
 426 {
 427         struct cxl_context *ctx = file->private_data;
 428         struct cxl_event_afu_driver_reserved *pl = NULL;
 429         struct cxl_event event;
 430         unsigned long flags;
 431         int rc;
 432         DEFINE_WAIT(wait);
 433 
 434         if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu))
 435                 return -EIO;
 436 
 437         if (count < CXL_READ_MIN_SIZE)
 438                 return -EINVAL;
 439 
 440         spin_lock_irqsave(&ctx->lock, flags);
 441 
 442         for (;;) {
 443                 prepare_to_wait(&ctx->wq, &wait, TASK_INTERRUPTIBLE);
 444                 if (ctx_event_pending(ctx) || (ctx->status == CLOSED))
 445                         break;
 446 
 447                 if (!cxl_ops->link_ok(ctx->afu->adapter, ctx->afu)) {
 448                         rc = -EIO;
 449                         goto out;
 450                 }
 451 
 452                 if (file->f_flags & O_NONBLOCK) {
 453                         rc = -EAGAIN;
 454                         goto out;
 455                 }
 456 
 457                 if (signal_pending(current)) {
 458                         rc = -ERESTARTSYS;
 459                         goto out;
 460                 }
 461 
 462                 spin_unlock_irqrestore(&ctx->lock, flags);
 463                 pr_devel("afu_read going to sleep...\n");
 464                 schedule();
 465                 pr_devel("afu_read woken up\n");
 466                 spin_lock_irqsave(&ctx->lock, flags);
 467         }
 468 
 469         finish_wait(&ctx->wq, &wait);
 470 
 471         memset(&event, 0, sizeof(event));
 472         event.header.process_element = ctx->pe;
 473         event.header.size = sizeof(struct cxl_event_header);
 474         if (ctx->afu_driver_ops && atomic_read(&ctx->afu_driver_events)) {
 475                 pr_devel("afu_read delivering AFU driver specific event\n");
 476                 pl = ctx->afu_driver_ops->fetch_event(ctx);
 477                 atomic_dec(&ctx->afu_driver_events);
 478                 event.header.type = CXL_EVENT_AFU_DRIVER;
 479         } else if (ctx->pending_irq) {
 480                 pr_devel("afu_read delivering AFU interrupt\n");
 481                 event.header.size += sizeof(struct cxl_event_afu_interrupt);
 482                 event.header.type = CXL_EVENT_AFU_INTERRUPT;
 483                 event.irq.irq = find_first_bit(ctx->irq_bitmap, ctx->irq_count) + 1;
 484                 clear_bit(event.irq.irq - 1, ctx->irq_bitmap);
 485                 if (bitmap_empty(ctx->irq_bitmap, ctx->irq_count))
 486                         ctx->pending_irq = false;
 487         } else if (ctx->pending_fault) {
 488                 pr_devel("afu_read delivering data storage fault\n");
 489                 event.header.size += sizeof(struct cxl_event_data_storage);
 490                 event.header.type = CXL_EVENT_DATA_STORAGE;
 491                 event.fault.addr = ctx->fault_addr;
 492                 event.fault.dsisr = ctx->fault_dsisr;
 493                 ctx->pending_fault = false;
 494         } else if (ctx->pending_afu_err) {
 495                 pr_devel("afu_read delivering afu error\n");
 496                 event.header.size += sizeof(struct cxl_event_afu_error);
 497                 event.header.type = CXL_EVENT_AFU_ERROR;
 498                 event.afu_error.error = ctx->afu_err;
 499                 ctx->pending_afu_err = false;
 500         } else if (ctx->status == CLOSED) {
 501                 pr_devel("afu_read fatal error\n");
 502                 spin_unlock_irqrestore(&ctx->lock, flags);
 503                 return -EIO;
 504         } else
 505                 WARN(1, "afu_read must be buggy\n");
 506 
 507         spin_unlock_irqrestore(&ctx->lock, flags);
 508 
 509         if (event.header.type == CXL_EVENT_AFU_DRIVER)
 510                 return afu_driver_event_copy(ctx, buf, &event, pl);
 511 
 512         if (copy_to_user(buf, &event, event.header.size))
 513                 return -EFAULT;
 514         return event.header.size;
 515 
 516 out:
 517         finish_wait(&ctx->wq, &wait);
 518         spin_unlock_irqrestore(&ctx->lock, flags);
 519         return rc;
 520 }
 521 
 522 /* 
 523  * Note: if this is updated, we need to update api.c to patch the new ones in
 524  * too
 525  */
 526 const struct file_operations afu_fops = {
 527         .owner          = THIS_MODULE,
 528         .open           = afu_open,
 529         .poll           = afu_poll,
 530         .read           = afu_read,
 531         .release        = afu_release,
 532         .unlocked_ioctl = afu_ioctl,
 533         .compat_ioctl   = afu_compat_ioctl,
 534         .mmap           = afu_mmap,
 535 };
 536 
 537 static const struct file_operations afu_master_fops = {
 538         .owner          = THIS_MODULE,
 539         .open           = afu_master_open,
 540         .poll           = afu_poll,
 541         .read           = afu_read,
 542         .release        = afu_release,
 543         .unlocked_ioctl = afu_ioctl,
 544         .compat_ioctl   = afu_compat_ioctl,
 545         .mmap           = afu_mmap,
 546 };
 547 
 548 
 549 static char *cxl_devnode(struct device *dev, umode_t *mode)
 550 {
 551         if (cpu_has_feature(CPU_FTR_HVMODE) &&
 552             CXL_DEVT_IS_CARD(dev->devt)) {
 553                 /*
 554                  * These minor numbers will eventually be used to program the
 555                  * PSL and AFUs once we have dynamic reprogramming support
 556                  */
 557                 return NULL;
 558         }
 559         return kasprintf(GFP_KERNEL, "cxl/%s", dev_name(dev));
 560 }
 561 
 562 extern struct class *cxl_class;
 563 
 564 static int cxl_add_chardev(struct cxl_afu *afu, dev_t devt, struct cdev *cdev,
 565                            struct device **chardev, char *postfix, char *desc,
 566                            const struct file_operations *fops)
 567 {
 568         struct device *dev;
 569         int rc;
 570 
 571         cdev_init(cdev, fops);
 572         if ((rc = cdev_add(cdev, devt, 1))) {
 573                 dev_err(&afu->dev, "Unable to add %s chardev: %i\n", desc, rc);
 574                 return rc;
 575         }
 576 
 577         dev = device_create(cxl_class, &afu->dev, devt, afu,
 578                         "afu%i.%i%s", afu->adapter->adapter_num, afu->slice, postfix);
 579         if (IS_ERR(dev)) {
 580                 dev_err(&afu->dev, "Unable to create %s chardev in sysfs: %i\n", desc, rc);
 581                 rc = PTR_ERR(dev);
 582                 goto err;
 583         }
 584 
 585         *chardev = dev;
 586 
 587         return 0;
 588 err:
 589         cdev_del(cdev);
 590         return rc;
 591 }
 592 
 593 int cxl_chardev_d_afu_add(struct cxl_afu *afu)
 594 {
 595         return cxl_add_chardev(afu, CXL_AFU_MKDEV_D(afu), &afu->afu_cdev_d,
 596                                &afu->chardev_d, "d", "dedicated",
 597                                &afu_master_fops); /* Uses master fops */
 598 }
 599 
 600 int cxl_chardev_m_afu_add(struct cxl_afu *afu)
 601 {
 602         return cxl_add_chardev(afu, CXL_AFU_MKDEV_M(afu), &afu->afu_cdev_m,
 603                                &afu->chardev_m, "m", "master",
 604                                &afu_master_fops);
 605 }
 606 
 607 int cxl_chardev_s_afu_add(struct cxl_afu *afu)
 608 {
 609         return cxl_add_chardev(afu, CXL_AFU_MKDEV_S(afu), &afu->afu_cdev_s,
 610                                &afu->chardev_s, "s", "shared",
 611                                &afu_fops);
 612 }
 613 
 614 void cxl_chardev_afu_remove(struct cxl_afu *afu)
 615 {
 616         if (afu->chardev_d) {
 617                 cdev_del(&afu->afu_cdev_d);
 618                 device_unregister(afu->chardev_d);
 619                 afu->chardev_d = NULL;
 620         }
 621         if (afu->chardev_m) {
 622                 cdev_del(&afu->afu_cdev_m);
 623                 device_unregister(afu->chardev_m);
 624                 afu->chardev_m = NULL;
 625         }
 626         if (afu->chardev_s) {
 627                 cdev_del(&afu->afu_cdev_s);
 628                 device_unregister(afu->chardev_s);
 629                 afu->chardev_s = NULL;
 630         }
 631 }
 632 
 633 int cxl_register_afu(struct cxl_afu *afu)
 634 {
 635         afu->dev.class = cxl_class;
 636 
 637         return device_register(&afu->dev);
 638 }
 639 
 640 int cxl_register_adapter(struct cxl *adapter)
 641 {
 642         adapter->dev.class = cxl_class;
 643 
 644         /*
 645          * Future: When we support dynamically reprogramming the PSL & AFU we
 646          * will expose the interface to do that via a chardev:
 647          * adapter->dev.devt = CXL_CARD_MKDEV(adapter);
 648          */
 649 
 650         return device_register(&adapter->dev);
 651 }
 652 
 653 dev_t cxl_get_dev(void)
 654 {
 655         return cxl_dev;
 656 }
 657 
 658 int __init cxl_file_init(void)
 659 {
 660         int rc;
 661 
 662         /*
 663          * If these change we really need to update API.  Either change some
 664          * flags or update API version number CXL_API_VERSION.
 665          */
 666         BUILD_BUG_ON(CXL_API_VERSION != 3);
 667         BUILD_BUG_ON(sizeof(struct cxl_ioctl_start_work) != 64);
 668         BUILD_BUG_ON(sizeof(struct cxl_event_header) != 8);
 669         BUILD_BUG_ON(sizeof(struct cxl_event_afu_interrupt) != 8);
 670         BUILD_BUG_ON(sizeof(struct cxl_event_data_storage) != 32);
 671         BUILD_BUG_ON(sizeof(struct cxl_event_afu_error) != 16);
 672 
 673         if ((rc = alloc_chrdev_region(&cxl_dev, 0, CXL_NUM_MINORS, "cxl"))) {
 674                 pr_err("Unable to allocate CXL major number: %i\n", rc);
 675                 return rc;
 676         }
 677 
 678         pr_devel("CXL device allocated, MAJOR %i\n", MAJOR(cxl_dev));
 679 
 680         cxl_class = class_create(THIS_MODULE, "cxl");
 681         if (IS_ERR(cxl_class)) {
 682                 pr_err("Unable to create CXL class\n");
 683                 rc = PTR_ERR(cxl_class);
 684                 goto err;
 685         }
 686         cxl_class->devnode = cxl_devnode;
 687 
 688         return 0;
 689 
 690 err:
 691         unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS);
 692         return rc;
 693 }
 694 
 695 void cxl_file_exit(void)
 696 {
 697         unregister_chrdev_region(cxl_dev, CXL_NUM_MINORS);
 698         class_destroy(cxl_class);
 699 }

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