drivers/rapidio/devices/rio_mport_cdev.c

   1 /*
   2  * RapidIO mport character device
   3  *
   4  * Copyright 2014-2015 Integrated Device Technology, Inc.
   5  *    Alexandre Bounine <alexandre.bounine@idt.com>
   6  * Copyright 2014-2015 Prodrive Technologies
   7  *    Andre van Herk <andre.van.herk@prodrive-technologies.com>
   8  *    Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
   9  * Copyright (C) 2014 Texas Instruments Incorporated
  10  *    Aurelien Jacquiot <a-jacquiot@ti.com>
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  */
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/cdev.h>
  20 #include <linux/ioctl.h>
  21 #include <linux/uaccess.h>
  22 #include <linux/list.h>
  23 #include <linux/fs.h>
  24 #include <linux/err.h>
  25 #include <linux/net.h>
  26 #include <linux/poll.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/sched.h>
  29 #include <linux/kfifo.h>
  30
  31 #include <linux/mm.h>
  32 #include <linux/slab.h>
  33 #include <linux/vmalloc.h>
  34 #include <linux/mman.h>
  35
  36 #include <linux/dma-mapping.h>
  37 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
  38 #include <linux/dmaengine.h>
  39 #endif
  40
  41 #include <linux/rio.h>
  42 #include <linux/rio_ids.h>
  43 #include <linux/rio_drv.h>
  44 #include <linux/rio_mport_cdev.h>
  45
  46 #include "../rio.h"
  47
  48 #define DRV_NAME        "rio_mport"
  49 #define DRV_PREFIX      DRV_NAME ": "
  50 #define DEV_NAME        "rio_mport"
  51 #define DRV_VERSION     "1.0.0"
  52
  53 /* Debug output filtering masks */
  54 enum {
  55         DBG_NONE        = 0,
  56         DBG_INIT        = BIT(0), /* driver init */
  57         DBG_EXIT        = BIT(1), /* driver exit */
  58         DBG_MPORT       = BIT(2), /* mport add/remove */
  59         DBG_RDEV        = BIT(3), /* RapidIO device add/remove */
  60         DBG_DMA         = BIT(4), /* DMA transfer messages */
  61         DBG_MMAP        = BIT(5), /* mapping messages */
  62         DBG_IBW         = BIT(6), /* inbound window */
  63         DBG_EVENT       = BIT(7), /* event handling messages */
  64         DBG_OBW         = BIT(8), /* outbound window messages */
  65         DBG_DBELL       = BIT(9), /* doorbell messages */
  66         DBG_ALL         = ~0,
  67 };
  68
  69 #ifdef DEBUG
  70 #define rmcd_debug(level, fmt, arg...)          \
  71         do {                                    \
  72                 if (DBG_##level & dbg_level)    \
  73                         pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
  74         } while (0)
  75 #else
  76 #define rmcd_debug(level, fmt, arg...) \
  77                 no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
  78 #endif
  79
  80 #define rmcd_warn(fmt, arg...) \
  81         pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)
  82
  83 #define rmcd_error(fmt, arg...) \
  84         pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)
  85
  86 MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>");
  87 MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>");
  88 MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
  89 MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>");
  90 MODULE_DESCRIPTION("RapidIO mport character device driver");
  91 MODULE_LICENSE("GPL");
  92 MODULE_VERSION(DRV_VERSION);
  93
  94 static int dma_timeout = 3000; /* DMA transfer timeout in msec */
  95 module_param(dma_timeout, int, S_IRUGO);
  96 MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)");
  97
  98 #ifdef DEBUG
  99 static u32 dbg_level = DBG_NONE;
 100 module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO);
 101 MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
 102 #endif
 103
 104 /*
 105  * An internal DMA coherent buffer
 106  */
 107 struct mport_dma_buf {
 108         void            *ib_base;
 109         dma_addr_t      ib_phys;
 110         u32             ib_size;
 111         u64             ib_rio_base;
 112         bool            ib_map;
 113         struct file     *filp;
 114 };
 115
 116 /*
 117  * Internal memory mapping structure
 118  */
 119 enum rio_mport_map_dir {
 120         MAP_INBOUND,
 121         MAP_OUTBOUND,
 122         MAP_DMA,
 123 };
 124
 125 struct rio_mport_mapping {
 126         struct list_head node;
 127         struct mport_dev *md;
 128         enum rio_mport_map_dir dir;
 129         u16 rioid;
 130         u64 rio_addr;
 131         dma_addr_t phys_addr; /* for mmap */
 132         void *virt_addr; /* kernel address, for dma_free_coherent */
 133         u64 size;
 134         struct kref ref; /* refcount of vmas sharing the mapping */
 135         struct file *filp;
 136 };
 137
 138 struct rio_mport_dma_map {
 139         int valid;
 140         u64 length;
 141         void *vaddr;
 142         dma_addr_t paddr;
 143 };
 144
 145 #define MPORT_MAX_DMA_BUFS      16
 146 #define MPORT_EVENT_DEPTH       10
 147
 148 /*
 149  * mport_dev  driver-specific structure that represents mport device
 150  * @active    mport device status flag
 151  * @node      list node to maintain list of registered mports
 152  * @cdev      character device
 153  * @dev       associated device object
 154  * @mport     associated subsystem's master port device object
 155  * @buf_mutex lock for buffer handling
 156  * @file_mutex - lock for open files list
 157  * @file_list  - list of open files on given mport
 158  * @properties properties of this mport
 159  * @portwrites queue of inbound portwrites
 160  * @pw_lock    lock for port write queue
 161  * @mappings   queue for memory mappings
 162  * @dma_chan   DMA channels associated with this device
 163  * @dma_ref:
 164  * @comp:
 165  */
 166 struct mport_dev {
 167         atomic_t                active;
 168         struct list_head        node;
 169         struct cdev             cdev;
 170         struct device           dev;
 171         struct rio_mport        *mport;
 172         struct mutex            buf_mutex;
 173         struct mutex            file_mutex;
 174         struct list_head        file_list;
 175         struct rio_mport_properties     properties;
 176         struct list_head                doorbells;
 177         spinlock_t                      db_lock;
 178         struct list_head                portwrites;
 179         spinlock_t                      pw_lock;
 180         struct list_head        mappings;
 181 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 182         struct dma_chan *dma_chan;
 183         struct kref     dma_ref;
 184         struct completion comp;
 185 #endif
 186 };
 187
 188 /*
 189  * mport_cdev_priv - data structure specific to individual file object
 190  *                   associated with an open device
 191  * @md    master port character device object
 192  * @async_queue - asynchronous notification queue
 193  * @list - file objects tracking list
 194  * @db_filters    inbound doorbell filters for this descriptor
 195  * @pw_filters    portwrite filters for this descriptor
 196  * @event_fifo    event fifo for this descriptor
 197  * @event_rx_wait wait queue for this descriptor
 198  * @fifo_lock     lock for event_fifo
 199  * @event_mask    event mask for this descriptor
 200  * @dmach DMA engine channel allocated for specific file object
 201  */
 202 struct mport_cdev_priv {
 203         struct mport_dev        *md;
 204         struct fasync_struct    *async_queue;
 205         struct list_head        list;
 206         struct list_head        db_filters;
 207         struct list_head        pw_filters;
 208         struct kfifo            event_fifo;
 209         wait_queue_head_t       event_rx_wait;
 210         spinlock_t              fifo_lock;
 211         u32                     event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
 212 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 213         struct dma_chan         *dmach;
 214         struct list_head        async_list;
 215         struct list_head        pend_list;
 216         spinlock_t              req_lock;
 217         struct mutex            dma_lock;
 218         struct kref             dma_ref;
 219         struct completion       comp;
 220 #endif
 221 };
 222
 223 /*
 224  * rio_mport_pw_filter - structure to describe a portwrite filter
 225  * md_node   node in mport device's list
 226  * priv_node node in private file object's list
 227  * priv      reference to private data
 228  * filter    actual portwrite filter
 229  */
 230 struct rio_mport_pw_filter {
 231         struct list_head md_node;
 232         struct list_head priv_node;
 233         struct mport_cdev_priv *priv;
 234         struct rio_pw_filter filter;
 235 };
 236
 237 /*
 238  * rio_mport_db_filter - structure to describe a doorbell filter
 239  * @data_node reference to device node
 240  * @priv_node node in private data
 241  * @priv      reference to private data
 242  * @filter    actual doorbell filter
 243  */
 244 struct rio_mport_db_filter {
 245         struct list_head data_node;
 246         struct list_head priv_node;
 247         struct mport_cdev_priv *priv;
 248         struct rio_doorbell_filter filter;
 249 };
 250
 251 static LIST_HEAD(mport_devs);
 252 static DEFINE_MUTEX(mport_devs_lock);
 253
 254 #if (0) /* used by commented out portion of poll function : FIXME */
 255 static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
 256 #endif
 257
 258 static struct class *dev_class;
 259 static dev_t dev_number;
 260
 261 static struct workqueue_struct *dma_wq;
 262
 263 static void mport_release_mapping(struct kref *ref);
 264
 265 static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
 266                               int local)
 267 {
 268         struct rio_mport *mport = priv->md->mport;
 269         struct rio_mport_maint_io maint_io;
 270         u32 *buffer;
 271         u32 offset;
 272         size_t length;
 273         int ret, i;
 274
 275         if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
 276                 return -EFAULT;
 277
 278         if ((maint_io.offset % 4) ||
 279             (maint_io.length == 0) || (maint_io.length % 4) ||
 280             (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
 281                 return -EINVAL;
 282
 283         buffer = vmalloc(maint_io.length);
 284         if (buffer == NULL)
 285                 return -ENOMEM;
 286         length = maint_io.length/sizeof(u32);
 287         offset = maint_io.offset;
 288
 289         for (i = 0; i < length; i++) {
 290                 if (local)
 291                         ret = __rio_local_read_config_32(mport,
 292                                 offset, &buffer[i]);
 293                 else
 294                         ret = rio_mport_read_config_32(mport, maint_io.rioid,
 295                                 maint_io.hopcount, offset, &buffer[i]);
 296                 if (ret)
 297                         goto out;
 298
 299                 offset += 4;
 300         }
 301
 302         if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
 303                                    buffer, maint_io.length)))
 304                 ret = -EFAULT;
 305 out:
 306         vfree(buffer);
 307         return ret;
 308 }
 309
 310 static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
 311                               int local)
 312 {
 313         struct rio_mport *mport = priv->md->mport;
 314         struct rio_mport_maint_io maint_io;
 315         u32 *buffer;
 316         u32 offset;
 317         size_t length;
 318         int ret = -EINVAL, i;
 319
 320         if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
 321                 return -EFAULT;
 322
 323         if ((maint_io.offset % 4) ||
 324             (maint_io.length == 0) || (maint_io.length % 4) ||
 325             (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
 326                 return -EINVAL;
 327
 328         buffer = vmalloc(maint_io.length);
 329         if (buffer == NULL)
 330                 return -ENOMEM;
 331         length = maint_io.length;
 332
 333         if (unlikely(copy_from_user(buffer,
 334                         (void __user *)(uintptr_t)maint_io.buffer, length))) {
 335                 ret = -EFAULT;
 336                 goto out;
 337         }
 338
 339         offset = maint_io.offset;
 340         length /= sizeof(u32);
 341
 342         for (i = 0; i < length; i++) {
 343                 if (local)
 344                         ret = __rio_local_write_config_32(mport,
 345                                                           offset, buffer[i]);
 346                 else
 347                         ret = rio_mport_write_config_32(mport, maint_io.rioid,
 348                                                         maint_io.hopcount,
 349                                                         offset, buffer[i]);
 350                 if (ret)
 351                         goto out;
 352
 353                 offset += 4;
 354         }
 355
 356 out:
 357         vfree(buffer);
 358         return ret;
 359 }
 360
 361
 362 /*
 363  * Inbound/outbound memory mapping functions
 364  */
 365 static int
 366 rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
 367                                   u16 rioid, u64 raddr, u32 size,
 368                                   dma_addr_t *paddr)
 369 {
 370         struct rio_mport *mport = md->mport;
 371         struct rio_mport_mapping *map;
 372         int ret;
 373
 374         rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);
 375
 376         map = kzalloc(sizeof(*map), GFP_KERNEL);
 377         if (map == NULL)
 378                 return -ENOMEM;
 379
 380         ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
 381         if (ret < 0)
 382                 goto err_map_outb;
 383
 384         map->dir = MAP_OUTBOUND;
 385         map->rioid = rioid;
 386         map->rio_addr = raddr;
 387         map->size = size;
 388         map->phys_addr = *paddr;
 389         map->filp = filp;
 390         map->md = md;
 391         kref_init(&map->ref);
 392         list_add_tail(&map->node, &md->mappings);
 393         return 0;
 394 err_map_outb:
 395         kfree(map);
 396         return ret;
 397 }
 398
 399 static int
 400 rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
 401                                u16 rioid, u64 raddr, u32 size,
 402                                dma_addr_t *paddr)
 403 {
 404         struct rio_mport_mapping *map;
 405         int err = -ENOMEM;
 406
 407         mutex_lock(&md->buf_mutex);
 408         list_for_each_entry(map, &md->mappings, node) {
 409                 if (map->dir != MAP_OUTBOUND)
 410                         continue;
 411                 if (rioid == map->rioid &&
 412                     raddr == map->rio_addr && size == map->size) {
 413                         *paddr = map->phys_addr;
 414                         err = 0;
 415                         break;
 416                 } else if (rioid == map->rioid &&
 417                            raddr < (map->rio_addr + map->size - 1) &&
 418                            (raddr + size) > map->rio_addr) {
 419                         err = -EBUSY;
 420                         break;
 421                 }
 422         }
 423
 424         /* If not found, create new */
 425         if (err == -ENOMEM)
 426                 err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
 427                                                 size, paddr);
 428         mutex_unlock(&md->buf_mutex);
 429         return err;
 430 }
 431
 432 static int rio_mport_obw_map(struct file *filp, void __user *arg)
 433 {
 434         struct mport_cdev_priv *priv = filp->private_data;
 435         struct mport_dev *data = priv->md;
 436         struct rio_mmap map;
 437         dma_addr_t paddr;
 438         int ret;
 439
 440         if (unlikely(copy_from_user(&map, arg, sizeof(map))))
 441                 return -EFAULT;
 442
 443         rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
 444                    map.rioid, map.rio_addr, map.length);
 445
 446         ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
 447                                              map.rio_addr, map.length, &paddr);
 448         if (ret < 0) {
 449                 rmcd_error("Failed to set OBW err= %d", ret);
 450                 return ret;
 451         }
 452
 453         map.handle = paddr;
 454
 455         if (unlikely(copy_to_user(arg, &map, sizeof(map))))
 456                 return -EFAULT;
 457         return 0;
 458 }
 459
 460 /*
 461  * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
 462  *
 463  * @priv: driver private data
 464  * @arg:  buffer handle returned by allocation routine
 465  */
 466 static int rio_mport_obw_free(struct file *filp, void __user *arg)
 467 {
 468         struct mport_cdev_priv *priv = filp->private_data;
 469         struct mport_dev *md = priv->md;
 470         u64 handle;
 471         struct rio_mport_mapping *map, *_map;
 472
 473         if (!md->mport->ops->unmap_outb)
 474                 return -EPROTONOSUPPORT;
 475
 476         if (copy_from_user(&handle, arg, sizeof(handle)))
 477                 return -EFAULT;
 478
 479         rmcd_debug(OBW, "h=0x%llx", handle);
 480
 481         mutex_lock(&md->buf_mutex);
 482         list_for_each_entry_safe(map, _map, &md->mappings, node) {
 483                 if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) {
 484                         if (map->filp == filp) {
 485                                 rmcd_debug(OBW, "kref_put h=0x%llx", handle);
 486                                 map->filp = NULL;
 487                                 kref_put(&map->ref, mport_release_mapping);
 488                         }
 489                         break;
 490                 }
 491         }
 492         mutex_unlock(&md->buf_mutex);
 493
 494         return 0;
 495 }
 496
 497 /*
 498  * maint_hdid_set() - Set the host Device ID
 499  * @priv: driver private data
 500  * @arg:        Device Id
 501  */
 502 static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
 503 {
 504         struct mport_dev *md = priv->md;
 505         u16 hdid;
 506
 507         if (copy_from_user(&hdid, arg, sizeof(hdid)))
 508                 return -EFAULT;
 509
 510         md->mport->host_deviceid = hdid;
 511         md->properties.hdid = hdid;
 512         rio_local_set_device_id(md->mport, hdid);
 513
 514         rmcd_debug(MPORT, "Set host device Id to %d", hdid);
 515
 516         return 0;
 517 }
 518
 519 /*
 520  * maint_comptag_set() - Set the host Component Tag
 521  * @priv: driver private data
 522  * @arg:        Component Tag
 523  */
 524 static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg)
 525 {
 526         struct mport_dev *md = priv->md;
 527         u32 comptag;
 528
 529         if (copy_from_user(&comptag, arg, sizeof(comptag)))
 530                 return -EFAULT;
 531
 532         rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag);
 533
 534         rmcd_debug(MPORT, "Set host Component Tag to %d", comptag);
 535
 536         return 0;
 537 }
 538
 539 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
 540
 541 struct mport_dma_req {
 542         struct list_head node;
 543         struct file *filp;
 544         struct mport_cdev_priv *priv;
 545         enum rio_transfer_sync sync;
 546         struct sg_table sgt;
 547         struct page **page_list;
 548         unsigned int nr_pages;
 549         struct rio_mport_mapping *map;
 550         struct dma_chan *dmach;
 551         enum dma_data_direction dir;
 552         dma_cookie_t cookie;
 553         enum dma_status status;
 554         struct completion req_comp;
 555 };
 556
 557 struct mport_faf_work {
 558         struct work_struct work;
 559         struct mport_dma_req *req;
 560 };
 561
 562 static void mport_release_def_dma(struct kref *dma_ref)
 563 {
 564         struct mport_dev *md =
 565                         container_of(dma_ref, struct mport_dev, dma_ref);
 566
 567         rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id);
 568         rio_release_dma(md->dma_chan);
 569         md->dma_chan = NULL;
 570 }
 571
 572 static void mport_release_dma(struct kref *dma_ref)
 573 {
 574         struct mport_cdev_priv *priv =
 575                         container_of(dma_ref, struct mport_cdev_priv, dma_ref);
 576
 577         rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id);
 578         complete(&priv->comp);
 579 }
 580
 581 static void dma_req_free(struct mport_dma_req *req)
 582 {
 583         struct mport_cdev_priv *priv = req->priv;
 584         unsigned int i;
 585
 586         dma_unmap_sg(req->dmach->device->dev,
 587                      req->sgt.sgl, req->sgt.nents, req->dir);
 588         sg_free_table(&req->sgt);
 589         if (req->page_list) {
 590                 for (i = 0; i < req->nr_pages; i++)
 591                         put_page(req->page_list[i]);
 592                 kfree(req->page_list);
 593         }
 594
 595         if (req->map) {
 596                 mutex_lock(&req->map->md->buf_mutex);
 597                 kref_put(&req->map->ref, mport_release_mapping);
 598                 mutex_unlock(&req->map->md->buf_mutex);
 599         }
 600
 601         kref_put(&priv->dma_ref, mport_release_dma);
 602
 603         kfree(req);
 604 }
 605
 606 static void dma_xfer_callback(void *param)
 607 {
 608         struct mport_dma_req *req = (struct mport_dma_req *)param;
 609         struct mport_cdev_priv *priv = req->priv;
 610
 611         req->status = dma_async_is_tx_complete(priv->dmach, req->cookie,
 612                                                NULL, NULL);
 613         complete(&req->req_comp);
 614 }
 615
 616 static void dma_faf_cleanup(struct work_struct *_work)
 617 {
 618         struct mport_faf_work *work = container_of(_work,
 619                                                 struct mport_faf_work, work);
 620         struct mport_dma_req *req = work->req;
 621
 622         dma_req_free(req);
 623         kfree(work);
 624 }
 625
 626 static void dma_faf_callback(void *param)
 627 {
 628         struct mport_dma_req *req = (struct mport_dma_req *)param;
 629         struct mport_faf_work *work;
 630
 631         work = kmalloc(sizeof(*work), GFP_ATOMIC);
 632         if (!work)
 633                 return;
 634
 635         INIT_WORK(&work->work, dma_faf_cleanup);
 636         work->req = req;
 637         queue_work(dma_wq, &work->work);
 638 }
 639
 640 /*
 641  * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
 642  *                   transfer object.
 643  * Returns pointer to DMA transaction descriptor allocated by DMA driver on
 644  * success or ERR_PTR (and/or NULL) if failed. Caller must check returned
 645  * non-NULL pointer using IS_ERR macro.
 646  */
 647 static struct dma_async_tx_descriptor
 648 *prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer,
 649         struct sg_table *sgt, int nents, enum dma_transfer_direction dir,
 650         enum dma_ctrl_flags flags)
 651 {
 652         struct rio_dma_data tx_data;
 653
 654         tx_data.sg = sgt->sgl;
 655         tx_data.sg_len = nents;
 656         tx_data.rio_addr_u = 0;
 657         tx_data.rio_addr = transfer->rio_addr;
 658         if (dir == DMA_MEM_TO_DEV) {
 659                 switch (transfer->method) {
 660                 case RIO_EXCHANGE_NWRITE:
 661                         tx_data.wr_type = RDW_ALL_NWRITE;
 662                         break;
 663                 case RIO_EXCHANGE_NWRITE_R_ALL:
 664                         tx_data.wr_type = RDW_ALL_NWRITE_R;
 665                         break;
 666                 case RIO_EXCHANGE_NWRITE_R:
 667                         tx_data.wr_type = RDW_LAST_NWRITE_R;
 668                         break;
 669                 case RIO_EXCHANGE_DEFAULT:
 670                         tx_data.wr_type = RDW_DEFAULT;
 671                         break;
 672                 default:
 673                         return ERR_PTR(-EINVAL);
 674                 }
 675         }
 676
 677         return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags);
 678 }
 679
 680 /* Request DMA channel associated with this mport device.
 681  * Try to request DMA channel for every new process that opened given
 682  * mport. If a new DMA channel is not available use default channel
 683  * which is the first DMA channel opened on mport device.
 684  */
 685 static int get_dma_channel(struct mport_cdev_priv *priv)
 686 {
 687         mutex_lock(&priv->dma_lock);
 688         if (!priv->dmach) {
 689                 priv->dmach = rio_request_mport_dma(priv->md->mport);
 690                 if (!priv->dmach) {
 691                         /* Use default DMA channel if available */
 692                         if (priv->md->dma_chan) {
 693                                 priv->dmach = priv->md->dma_chan;
 694                                 kref_get(&priv->md->dma_ref);
 695                         } else {
 696                                 rmcd_error("Failed to get DMA channel");
 697                                 mutex_unlock(&priv->dma_lock);
 698                                 return -ENODEV;
 699                         }
 700                 } else if (!priv->md->dma_chan) {
 701                         /* Register default DMA channel if we do not have one */
 702                         priv->md->dma_chan = priv->dmach;
 703                         kref_init(&priv->md->dma_ref);
 704                         rmcd_debug(DMA, "Register DMA_chan %d as default",
 705                                    priv->dmach->chan_id);
 706                 }
 707
 708                 kref_init(&priv->dma_ref);
 709                 init_completion(&priv->comp);
 710         }
 711
 712         kref_get(&priv->dma_ref);
 713         mutex_unlock(&priv->dma_lock);
 714         return 0;
 715 }
 716
 717 static void put_dma_channel(struct mport_cdev_priv *priv)
 718 {
 719         kref_put(&priv->dma_ref, mport_release_dma);
 720 }
 721
 722 /*
 723  * DMA transfer functions
 724  */
 725 static int do_dma_request(struct mport_dma_req *req,
 726                           struct rio_transfer_io *xfer,
 727                           enum rio_transfer_sync sync, int nents)
 728 {
 729         struct mport_cdev_priv *priv;
 730         struct sg_table *sgt;
 731         struct dma_chan *chan;
 732         struct dma_async_tx_descriptor *tx;
 733         dma_cookie_t cookie;
 734         unsigned long tmo = msecs_to_jiffies(dma_timeout);
 735         enum dma_transfer_direction dir;
 736         long wret;
 737         int ret = 0;
 738
 739         priv = req->priv;
 740         sgt = &req->sgt;
 741
 742         chan = priv->dmach;
 743         dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
 744
 745         rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s",
 746                    current->comm, task_pid_nr(current),
 747                    dev_name(&chan->dev->device),
 748                    (dir == DMA_DEV_TO_MEM)?"READ":"WRITE");
 749
 750         /* Initialize DMA transaction request */
 751         tx = prep_dma_xfer(chan, xfer, sgt, nents, dir,
 752                            DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
 753
 754         if (!tx) {
 755                 rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx",
 756                         (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
 757                         xfer->rio_addr, xfer->length);
 758                 ret = -EIO;
 759                 goto err_out;
 760         } else if (IS_ERR(tx)) {
 761                 ret = PTR_ERR(tx);
 762                 rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret,
 763                         (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
 764                         xfer->rio_addr, xfer->length);
 765                 goto err_out;
 766         }
 767
 768         if (sync == RIO_TRANSFER_FAF)
 769                 tx->callback = dma_faf_callback;
 770         else
 771                 tx->callback = dma_xfer_callback;
 772         tx->callback_param = req;
 773
 774         req->dmach = chan;
 775         req->sync = sync;
 776         req->status = DMA_IN_PROGRESS;
 777         init_completion(&req->req_comp);
 778
 779         cookie = dmaengine_submit(tx);
 780         req->cookie = cookie;
 781
 782         rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current),
 783                    (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
 784
 785         if (dma_submit_error(cookie)) {
 786                 rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)",
 787                            cookie, xfer->rio_addr, xfer->length);
 788                 ret = -EIO;
 789                 goto err_out;
 790         }
 791
 792         dma_async_issue_pending(chan);
 793
 794         if (sync == RIO_TRANSFER_ASYNC) {
 795                 spin_lock(&priv->req_lock);
 796                 list_add_tail(&req->node, &priv->async_list);
 797                 spin_unlock(&priv->req_lock);
 798                 return cookie;
 799         } else if (sync == RIO_TRANSFER_FAF)
 800                 return 0;
 801
 802         wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
 803
 804         if (wret == 0) {
 805                 /* Timeout on wait occurred */
 806                 rmcd_error("%s(%d) timed out waiting for DMA_%s %d",
 807                        current->comm, task_pid_nr(current),
 808                        (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
 809                 return -ETIMEDOUT;
 810         } else if (wret == -ERESTARTSYS) {
 811                 /* Wait_for_completion was interrupted by a signal but DMA may
 812                  * be in progress
 813                  */
 814                 rmcd_error("%s(%d) wait for DMA_%s %d was interrupted",
 815                         current->comm, task_pid_nr(current),
 816                         (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
 817                 return -EINTR;
 818         }
 819
 820         if (req->status != DMA_COMPLETE) {
 821                 /* DMA transaction completion was signaled with error */
 822                 rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)",
 823                         current->comm, task_pid_nr(current),
 824                         (dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
 825                         cookie, req->status, ret);
 826                 ret = -EIO;
 827         }
 828
 829 err_out:
 830         return ret;
 831 }
 832
 833 /*
 834  * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from
 835  *                      the remote RapidIO device
 836  * @filp: file pointer associated with the call
 837  * @transfer_mode: DMA transfer mode
 838  * @sync: synchronization mode
 839  * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR
 840  *                               DMA_DEV_TO_MEM = read)
 841  * @xfer: data transfer descriptor structure
 842  */
 843 static int
 844 rio_dma_transfer(struct file *filp, u32 transfer_mode,
 845                  enum rio_transfer_sync sync, enum dma_data_direction dir,
 846                  struct rio_transfer_io *xfer)
 847 {
 848         struct mport_cdev_priv *priv = filp->private_data;
 849         unsigned long nr_pages = 0;
 850         struct page **page_list = NULL;
 851         struct mport_dma_req *req;
 852         struct mport_dev *md = priv->md;
 853         struct dma_chan *chan;
 854         int i, ret;
 855         int nents;
 856
 857         if (xfer->length == 0)
 858                 return -EINVAL;
 859         req = kzalloc(sizeof(*req), GFP_KERNEL);
 860         if (!req)
 861                 return -ENOMEM;
 862
 863         ret = get_dma_channel(priv);
 864         if (ret) {
 865                 kfree(req);
 866                 return ret;
 867         }
 868
 869         /*
 870          * If parameter loc_addr != NULL, we are transferring data from/to
 871          * data buffer allocated in user-space: lock in memory user-space
 872          * buffer pages and build an SG table for DMA transfer request
 873          *
 874          * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is
 875          * used for DMA data transfers: build single entry SG table using
 876          * offset within the internal buffer specified by handle parameter.
 877          */
 878         if (xfer->loc_addr) {
 879                 unsigned long offset;
 880                 long pinned;
 881
 882                 offset = (unsigned long)(uintptr_t)xfer->loc_addr & ~PAGE_MASK;
 883                 nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
 884
 885                 page_list = kmalloc_array(nr_pages,
 886                                           sizeof(*page_list), GFP_KERNEL);
 887                 if (page_list == NULL) {
 888                         ret = -ENOMEM;
 889                         goto err_req;
 890                 }
 891
 892                 pinned = get_user_pages_unlocked(
 893                                 (unsigned long)xfer->loc_addr & PAGE_MASK,
 894                                 nr_pages,
 895                                 page_list,
 896                                 dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0);
 897
 898                 if (pinned != nr_pages) {
 899                         if (pinned < 0) {
 900                                 rmcd_error("get_user_pages_unlocked err=%ld",
 901                                            pinned);
 902                                 nr_pages = 0;
 903                         } else {
 904                                 rmcd_error("pinned %ld out of %ld pages",
 905                                            pinned, nr_pages);
 906                                 /*
 907                                  * Set nr_pages up to mean "how many pages to unpin, in
 908                                  * the error handler:
 909                                  */
 910                                 nr_pages = pinned;
 911                         }
 912                         ret = -EFAULT;
 913                         goto err_pg;
 914                 }
 915
 916                 ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
 917                                         offset, xfer->length, GFP_KERNEL);
 918                 if (ret) {
 919                         rmcd_error("sg_alloc_table failed with err=%d", ret);
 920                         goto err_pg;
 921                 }
 922
 923                 req->page_list = page_list;
 924                 req->nr_pages = nr_pages;
 925         } else {
 926                 dma_addr_t baddr;
 927                 struct rio_mport_mapping *map;
 928
 929                 baddr = (dma_addr_t)xfer->handle;
 930
 931                 mutex_lock(&md->buf_mutex);
 932                 list_for_each_entry(map, &md->mappings, node) {
 933                         if (baddr >= map->phys_addr &&
 934                             baddr < (map->phys_addr + map->size)) {
 935                                 kref_get(&map->ref);
 936                                 req->map = map;
 937                                 break;
 938                         }
 939                 }
 940                 mutex_unlock(&md->buf_mutex);
 941
 942                 if (req->map == NULL) {
 943                         ret = -ENOMEM;
 944                         goto err_req;
 945                 }
 946
 947                 if (xfer->length + xfer->offset > map->size) {
 948                         ret = -EINVAL;
 949                         goto err_req;
 950                 }
 951
 952                 ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
 953                 if (unlikely(ret)) {
 954                         rmcd_error("sg_alloc_table failed for internal buf");
 955                         goto err_req;
 956                 }
 957
 958                 sg_set_buf(req->sgt.sgl,
 959                            map->virt_addr + (baddr - map->phys_addr) +
 960                                 xfer->offset, xfer->length);
 961         }
 962
 963         req->dir = dir;
 964         req->filp = filp;
 965         req->priv = priv;
 966         chan = priv->dmach;
 967
 968         nents = dma_map_sg(chan->device->dev,
 969                            req->sgt.sgl, req->sgt.nents, dir);
 970         if (nents == -EFAULT) {
 971                 rmcd_error("Failed to map SG list");
 972                 ret = -EFAULT;
 973                 goto err_pg;
 974         }
 975
 976         ret = do_dma_request(req, xfer, sync, nents);
 977
 978         if (ret >= 0) {
 979                 if (sync == RIO_TRANSFER_SYNC)
 980                         goto sync_out;
 981                 return ret; /* return ASYNC cookie */
 982         }
 983
 984         if (ret == -ETIMEDOUT || ret == -EINTR) {
 985                 /*
 986                  * This can happen only in case of SYNC transfer.
 987                  * Do not free unfinished request structure immediately.
 988                  * Place it into pending list and deal with it later
 989                  */
 990                 spin_lock(&priv->req_lock);
 991                 list_add_tail(&req->node, &priv->pend_list);
 992                 spin_unlock(&priv->req_lock);
 993                 return ret;
 994         }
 995
 996
 997         rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
 998 sync_out:
 999         dma_unmap_sg(chan->device->dev, req->sgt.sgl, req->sgt.nents, dir);
1000         sg_free_table(&req->sgt);
1001 err_pg:
1002         if (page_list) {
1003                 for (i = 0; i < nr_pages; i++)
1004                         put_page(page_list[i]);
1005                 kfree(page_list);
1006         }
1007 err_req:
1008         if (req->map) {
1009                 mutex_lock(&md->buf_mutex);
1010                 kref_put(&req->map->ref, mport_release_mapping);
1011                 mutex_unlock(&md->buf_mutex);
1012         }
1013         put_dma_channel(priv);
1014         kfree(req);
1015         return ret;
1016 }
1017
1018 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
1019 {
1020         struct mport_cdev_priv *priv = filp->private_data;
1021         struct rio_transaction transaction;
1022         struct rio_transfer_io *transfer;
1023         enum dma_data_direction dir;
1024         int i, ret = 0;
1025
1026         if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
1027                 return -EFAULT;
1028
1029         if (transaction.count != 1) /* only single transfer for now */
1030                 return -EINVAL;
1031
1032         if ((transaction.transfer_mode &
1033              priv->md->properties.transfer_mode) == 0)
1034                 return -ENODEV;
1035
1036         transfer = vmalloc(transaction.count * sizeof(*transfer));
1037         if (!transfer)
1038                 return -ENOMEM;
1039
1040         if (unlikely(copy_from_user(transfer,
1041                                     (void __user *)(uintptr_t)transaction.block,
1042                                     transaction.count * sizeof(*transfer)))) {
1043                 ret = -EFAULT;
1044                 goto out_free;
1045         }
1046
1047         dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
1048                                         DMA_FROM_DEVICE : DMA_TO_DEVICE;
1049         for (i = 0; i < transaction.count && ret == 0; i++)
1050                 ret = rio_dma_transfer(filp, transaction.transfer_mode,
1051                         transaction.sync, dir, &transfer[i]);
1052
1053         if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
1054                                   transfer,
1055                                   transaction.count * sizeof(*transfer))))
1056                 ret = -EFAULT;
1057
1058 out_free:
1059         vfree(transfer);
1060
1061         return ret;
1062 }
1063
1064 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1065 {
1066         struct mport_cdev_priv *priv;
1067         struct mport_dev *md;
1068         struct rio_async_tx_wait w_param;
1069         struct mport_dma_req *req;
1070         dma_cookie_t cookie;
1071         unsigned long tmo;
1072         long wret;
1073         int found = 0;
1074         int ret;
1075
1076         priv = (struct mport_cdev_priv *)filp->private_data;
1077         md = priv->md;
1078
1079         if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
1080                 return -EFAULT;
1081
1082         cookie = w_param.token;
1083         if (w_param.timeout)
1084                 tmo = msecs_to_jiffies(w_param.timeout);
1085         else /* Use default DMA timeout */
1086                 tmo = msecs_to_jiffies(dma_timeout);
1087
1088         spin_lock(&priv->req_lock);
1089         list_for_each_entry(req, &priv->async_list, node) {
1090                 if (req->cookie == cookie) {
1091                         list_del(&req->node);
1092                         found = 1;
1093                         break;
1094                 }
1095         }
1096         spin_unlock(&priv->req_lock);
1097
1098         if (!found)
1099                 return -EAGAIN;
1100
1101         wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
1102
1103         if (wret == 0) {
1104                 /* Timeout on wait occurred */
1105                 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1106                        current->comm, task_pid_nr(current),
1107                        (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1108                 ret = -ETIMEDOUT;
1109                 goto err_tmo;
1110         } else if (wret == -ERESTARTSYS) {
1111                 /* Wait_for_completion was interrupted by a signal but DMA may
1112                  * be still in progress
1113                  */
1114                 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1115                         current->comm, task_pid_nr(current),
1116                         (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1117                 ret = -EINTR;
1118                 goto err_tmo;
1119         }
1120
1121         if (req->status != DMA_COMPLETE) {
1122                 /* DMA transaction completion signaled with transfer error */
1123                 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1124                         current->comm, task_pid_nr(current),
1125                         (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
1126                         req->status);
1127                 ret = -EIO;
1128         } else
1129                 ret = 0;
1130
1131         if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1132                 dma_req_free(req);
1133
1134         return ret;
1135
1136 err_tmo:
1137         /* Return request back into async queue */
1138         spin_lock(&priv->req_lock);
1139         list_add_tail(&req->node, &priv->async_list);
1140         spin_unlock(&priv->req_lock);
1141         return ret;
1142 }
1143
1144 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1145                         u64 size, struct rio_mport_mapping **mapping)
1146 {
1147         struct rio_mport_mapping *map;
1148
1149         map = kzalloc(sizeof(*map), GFP_KERNEL);
1150         if (map == NULL)
1151                 return -ENOMEM;
1152
1153         map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1154                                             &map->phys_addr, GFP_KERNEL);
1155         if (map->virt_addr == NULL) {
1156                 kfree(map);
1157                 return -ENOMEM;
1158         }
1159
1160         map->dir = MAP_DMA;
1161         map->size = size;
1162         map->filp = filp;
1163         map->md = md;
1164         kref_init(&map->ref);
1165         mutex_lock(&md->buf_mutex);
1166         list_add_tail(&map->node, &md->mappings);
1167         mutex_unlock(&md->buf_mutex);
1168         *mapping = map;
1169
1170         return 0;
1171 }
1172
1173 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1174 {
1175         struct mport_cdev_priv *priv = filp->private_data;
1176         struct mport_dev *md = priv->md;
1177         struct rio_dma_mem map;
1178         struct rio_mport_mapping *mapping = NULL;
1179         int ret;
1180
1181         if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1182                 return -EFAULT;
1183
1184         ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1185         if (ret)
1186                 return ret;
1187
1188         map.dma_handle = mapping->phys_addr;
1189
1190         if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1191                 mutex_lock(&md->buf_mutex);
1192                 kref_put(&mapping->ref, mport_release_mapping);
1193                 mutex_unlock(&md->buf_mutex);
1194                 return -EFAULT;
1195         }
1196
1197         return 0;
1198 }
1199
1200 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1201 {
1202         struct mport_cdev_priv *priv = filp->private_data;
1203         struct mport_dev *md = priv->md;
1204         u64 handle;
1205         int ret = -EFAULT;
1206         struct rio_mport_mapping *map, *_map;
1207
1208         if (copy_from_user(&handle, arg, sizeof(handle)))
1209                 return -EFAULT;
1210         rmcd_debug(EXIT, "filp=%p", filp);
1211
1212         mutex_lock(&md->buf_mutex);
1213         list_for_each_entry_safe(map, _map, &md->mappings, node) {
1214                 if (map->dir == MAP_DMA && map->phys_addr == handle &&
1215                     map->filp == filp) {
1216                         kref_put(&map->ref, mport_release_mapping);
1217                         ret = 0;
1218                         break;
1219                 }
1220         }
1221         mutex_unlock(&md->buf_mutex);
1222
1223         if (ret == -EFAULT) {
1224                 rmcd_debug(DMA, "ERR no matching mapping");
1225                 return ret;
1226         }
1227
1228         return 0;
1229 }
1230 #else
1231 static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1232 {
1233         return -ENODEV;
1234 }
1235
1236 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1237 {
1238         return -ENODEV;
1239 }
1240
1241 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1242 {
1243         return -ENODEV;
1244 }
1245
1246 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1247 {
1248         return -ENODEV;
1249 }
1250 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1251
1252 /*
1253  * Inbound/outbound memory mapping functions
1254  */
1255
1256 static int
1257 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1258                                 u64 raddr, u64 size,
1259                                 struct rio_mport_mapping **mapping)
1260 {
1261         struct rio_mport *mport = md->mport;
1262         struct rio_mport_mapping *map;
1263         int ret;
1264
1265         /* rio_map_inb_region() accepts u32 size */
1266         if (size > 0xffffffff)
1267                 return -EINVAL;
1268
1269         map = kzalloc(sizeof(*map), GFP_KERNEL);
1270         if (map == NULL)
1271                 return -ENOMEM;
1272
1273         map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1274                                             &map->phys_addr, GFP_KERNEL);
1275         if (map->virt_addr == NULL) {
1276                 ret = -ENOMEM;
1277                 goto err_dma_alloc;
1278         }
1279
1280         if (raddr == RIO_MAP_ANY_ADDR)
1281                 raddr = map->phys_addr;
1282         ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1283         if (ret < 0)
1284                 goto err_map_inb;
1285
1286         map->dir = MAP_INBOUND;
1287         map->rio_addr = raddr;
1288         map->size = size;
1289         map->filp = filp;
1290         map->md = md;
1291         kref_init(&map->ref);
1292         mutex_lock(&md->buf_mutex);
1293         list_add_tail(&map->node, &md->mappings);
1294         mutex_unlock(&md->buf_mutex);
1295         *mapping = map;
1296         return 0;
1297
1298 err_map_inb:
1299         dma_free_coherent(mport->dev.parent, size,
1300                           map->virt_addr, map->phys_addr);
1301 err_dma_alloc:
1302         kfree(map);
1303         return ret;
1304 }
1305
1306 static int
1307 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1308                               u64 raddr, u64 size,
1309                               struct rio_mport_mapping **mapping)
1310 {
1311         struct rio_mport_mapping *map;
1312         int err = -ENOMEM;
1313
1314         if (raddr == RIO_MAP_ANY_ADDR)
1315                 goto get_new;
1316
1317         mutex_lock(&md->buf_mutex);
1318         list_for_each_entry(map, &md->mappings, node) {
1319                 if (map->dir != MAP_INBOUND)
1320                         continue;
1321                 if (raddr == map->rio_addr && size == map->size) {
1322                         /* allow exact match only */
1323                         *mapping = map;
1324                         err = 0;
1325                         break;
1326                 } else if (raddr < (map->rio_addr + map->size - 1) &&
1327                            (raddr + size) > map->rio_addr) {
1328                         err = -EBUSY;
1329                         break;
1330                 }
1331         }
1332         mutex_unlock(&md->buf_mutex);
1333
1334         if (err != -ENOMEM)
1335                 return err;
1336 get_new:
1337         /* not found, create new */
1338         return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1339 }
1340
1341 static int rio_mport_map_inbound(struct file *filp, void __user *arg)
1342 {
1343         struct mport_cdev_priv *priv = filp->private_data;
1344         struct mport_dev *md = priv->md;
1345         struct rio_mmap map;
1346         struct rio_mport_mapping *mapping = NULL;
1347         int ret;
1348
1349         if (!md->mport->ops->map_inb)
1350                 return -EPROTONOSUPPORT;
1351         if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1352                 return -EFAULT;
1353
1354         rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1355
1356         ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1357                                             map.length, &mapping);
1358         if (ret)
1359                 return ret;
1360
1361         map.handle = mapping->phys_addr;
1362         map.rio_addr = mapping->rio_addr;
1363
1364         if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1365                 /* Delete mapping if it was created by this request */
1366                 if (ret == 0 && mapping->filp == filp) {
1367                         mutex_lock(&md->buf_mutex);
1368                         kref_put(&mapping->ref, mport_release_mapping);
1369                         mutex_unlock(&md->buf_mutex);
1370                 }
1371                 return -EFAULT;
1372         }
1373
1374         return 0;
1375 }
1376
1377 /*
1378  * rio_mport_inbound_free() - unmap from RapidIO address space and free
1379  *                    previously allocated inbound DMA coherent buffer
1380  * @priv: driver private data
1381  * @arg:  buffer handle returned by allocation routine
1382  */
1383 static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1384 {
1385         struct mport_cdev_priv *priv = filp->private_data;
1386         struct mport_dev *md = priv->md;
1387         u64 handle;
1388         struct rio_mport_mapping *map, *_map;
1389
1390         rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1391
1392         if (!md->mport->ops->unmap_inb)
1393                 return -EPROTONOSUPPORT;
1394
1395         if (copy_from_user(&handle, arg, sizeof(handle)))
1396                 return -EFAULT;
1397
1398         mutex_lock(&md->buf_mutex);
1399         list_for_each_entry_safe(map, _map, &md->mappings, node) {
1400                 if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
1401                         if (map->filp == filp) {
1402                                 map->filp = NULL;
1403                                 kref_put(&map->ref, mport_release_mapping);
1404                         }
1405                         break;
1406                 }
1407         }
1408         mutex_unlock(&md->buf_mutex);
1409
1410         return 0;
1411 }
1412
1413 /*
1414  * maint_port_idx_get() - Get the port index of the mport instance
1415  * @priv: driver private data
1416  * @arg:  port index
1417  */
1418 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1419 {
1420         struct mport_dev *md = priv->md;
1421         u32 port_idx = md->mport->index;
1422
1423         rmcd_debug(MPORT, "port_index=%d", port_idx);
1424
1425         if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1426                 return -EFAULT;
1427
1428         return 0;
1429 }
1430
1431 static int rio_mport_add_event(struct mport_cdev_priv *priv,
1432                                struct rio_event *event)
1433 {
1434         int overflow;
1435
1436         if (!(priv->event_mask & event->header))
1437                 return -EACCES;
1438
1439         spin_lock(&priv->fifo_lock);
1440         overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
1441                 || kfifo_in(&priv->event_fifo, (unsigned char *)event,
1442                         sizeof(*event)) != sizeof(*event);
1443         spin_unlock(&priv->fifo_lock);
1444
1445         wake_up_interruptible(&priv->event_rx_wait);
1446
1447         if (overflow) {
1448                 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1449                 return -EBUSY;
1450         }
1451
1452         return 0;
1453 }
1454
1455 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1456                                        u16 src, u16 dst, u16 info)
1457 {
1458         struct mport_dev *data = dev_id;
1459         struct mport_cdev_priv *priv;
1460         struct rio_mport_db_filter *db_filter;
1461         struct rio_event event;
1462         int handled;
1463
1464         event.header = RIO_DOORBELL;
1465         event.u.doorbell.rioid = src;
1466         event.u.doorbell.payload = info;
1467
1468         handled = 0;
1469         spin_lock(&data->db_lock);
1470         list_for_each_entry(db_filter, &data->doorbells, data_node) {
1471                 if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1472                       db_filter->filter.rioid == src)) &&
1473                       info >= db_filter->filter.low &&
1474                       info <= db_filter->filter.high) {
1475                         priv = db_filter->priv;
1476                         rio_mport_add_event(priv, &event);
1477                         handled = 1;
1478                 }
1479         }
1480         spin_unlock(&data->db_lock);
1481
1482         if (!handled)
1483                 dev_warn(&data->dev,
1484                         "%s: spurious DB received from 0x%x, info=0x%04x\n",
1485                         __func__, src, info);
1486 }
1487
1488 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
1489                                    void __user *arg)
1490 {
1491         struct mport_dev *md = priv->md;
1492         struct rio_mport_db_filter *db_filter;
1493         struct rio_doorbell_filter filter;
1494         unsigned long flags;
1495         int ret;
1496
1497         if (copy_from_user(&filter, arg, sizeof(filter)))
1498                 return -EFAULT;
1499
1500         if (filter.low > filter.high)
1501                 return -EINVAL;
1502
1503         ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1504                                     rio_mport_doorbell_handler);
1505         if (ret) {
1506                 rmcd_error("%s failed to register IBDB, err=%d",
1507                            dev_name(&md->dev), ret);
1508                 return ret;
1509         }
1510
1511         db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
1512         if (db_filter == NULL) {
1513                 rio_release_inb_dbell(md->mport, filter.low, filter.high);
1514                 return -ENOMEM;
1515         }
1516
1517         db_filter->filter = filter;
1518         db_filter->priv = priv;
1519         spin_lock_irqsave(&md->db_lock, flags);
1520         list_add_tail(&db_filter->priv_node, &priv->db_filters);
1521         list_add_tail(&db_filter->data_node, &md->doorbells);
1522         spin_unlock_irqrestore(&md->db_lock, flags);
1523
1524         return 0;
1525 }
1526
1527 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1528 {
1529         list_del(&db_filter->data_node);
1530         list_del(&db_filter->priv_node);
1531         kfree(db_filter);
1532 }
1533
1534 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1535                                       void __user *arg)
1536 {
1537         struct rio_mport_db_filter *db_filter;
1538         struct rio_doorbell_filter filter;
1539         unsigned long flags;
1540         int ret = -EINVAL;
1541
1542         if (copy_from_user(&filter, arg, sizeof(filter)))
1543                 return -EFAULT;
1544
1545         if (filter.low > filter.high)
1546                 return -EINVAL;
1547
1548         spin_lock_irqsave(&priv->md->db_lock, flags);
1549         list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
1550                 if (db_filter->filter.rioid == filter.rioid &&
1551                     db_filter->filter.low == filter.low &&
1552                     db_filter->filter.high == filter.high) {
1553                         rio_mport_delete_db_filter(db_filter);
1554                         ret = 0;
1555                         break;
1556                 }
1557         }
1558         spin_unlock_irqrestore(&priv->md->db_lock, flags);
1559
1560         if (!ret)
1561                 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1562
1563         return ret;
1564 }
1565
1566 static int rio_mport_match_pw(union rio_pw_msg *msg,
1567                               struct rio_pw_filter *filter)
1568 {
1569         if ((msg->em.comptag & filter->mask) < filter->low ||
1570                 (msg->em.comptag & filter->mask) > filter->high)
1571                 return 0;
1572         return 1;
1573 }
1574
1575 static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1576                                 union rio_pw_msg *msg, int step)
1577 {
1578         struct mport_dev *md = context;
1579         struct mport_cdev_priv *priv;
1580         struct rio_mport_pw_filter *pw_filter;
1581         struct rio_event event;
1582         int handled;
1583
1584         event.header = RIO_PORTWRITE;
1585         memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
1586
1587         handled = 0;
1588         spin_lock(&md->pw_lock);
1589         list_for_each_entry(pw_filter, &md->portwrites, md_node) {
1590                 if (rio_mport_match_pw(msg, &pw_filter->filter)) {
1591                         priv = pw_filter->priv;
1592                         rio_mport_add_event(priv, &event);
1593                         handled = 1;
1594                 }
1595         }
1596         spin_unlock(&md->pw_lock);
1597
1598         if (!handled) {
1599                 printk_ratelimited(KERN_WARNING DRV_NAME
1600                         ": mport%d received spurious PW from 0x%08x\n",
1601                         mport->id, msg->em.comptag);
1602         }
1603
1604         return 0;
1605 }
1606
1607 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
1608                                    void __user *arg)
1609 {
1610         struct mport_dev *md = priv->md;
1611         struct rio_mport_pw_filter *pw_filter;
1612         struct rio_pw_filter filter;
1613         unsigned long flags;
1614         int hadd = 0;
1615
1616         if (copy_from_user(&filter, arg, sizeof(filter)))
1617                 return -EFAULT;
1618
1619         pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1620         if (pw_filter == NULL)
1621                 return -ENOMEM;
1622
1623         pw_filter->filter = filter;
1624         pw_filter->priv = priv;
1625         spin_lock_irqsave(&md->pw_lock, flags);
1626         if (list_empty(&md->portwrites))
1627                 hadd = 1;
1628         list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
1629         list_add_tail(&pw_filter->md_node, &md->portwrites);
1630         spin_unlock_irqrestore(&md->pw_lock, flags);
1631
1632         if (hadd) {
1633                 int ret;
1634
1635                 ret = rio_add_mport_pw_handler(md->mport, md,
1636                                                rio_mport_pw_handler);
1637                 if (ret) {
1638                         dev_err(&md->dev,
1639                                 "%s: failed to add IB_PW handler, err=%d\n",
1640                                 __func__, ret);
1641                         return ret;
1642                 }
1643                 rio_pw_enable(md->mport, 1);
1644         }
1645
1646         return 0;
1647 }
1648
1649 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1650 {
1651         list_del(&pw_filter->md_node);
1652         list_del(&pw_filter->priv_node);
1653         kfree(pw_filter);
1654 }
1655
1656 static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1657                                      struct rio_pw_filter *b)
1658 {
1659         if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1660                 return 1;
1661         return 0;
1662 }
1663
1664 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
1665                                       void __user *arg)
1666 {
1667         struct mport_dev *md = priv->md;
1668         struct rio_mport_pw_filter *pw_filter;
1669         struct rio_pw_filter filter;
1670         unsigned long flags;
1671         int ret = -EINVAL;
1672         int hdel = 0;
1673
1674         if (copy_from_user(&filter, arg, sizeof(filter)))
1675                 return -EFAULT;
1676
1677         spin_lock_irqsave(&md->pw_lock, flags);
1678         list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
1679                 if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
1680                         rio_mport_delete_pw_filter(pw_filter);
1681                         ret = 0;
1682                         break;
1683                 }
1684         }
1685
1686         if (list_empty(&md->portwrites))
1687                 hdel = 1;
1688         spin_unlock_irqrestore(&md->pw_lock, flags);
1689
1690         if (hdel) {
1691                 rio_del_mport_pw_handler(md->mport, priv->md,
1692                                          rio_mport_pw_handler);
1693                 rio_pw_enable(md->mport, 0);
1694         }
1695
1696         return ret;
1697 }
1698
1699 /*
1700  * rio_release_dev - release routine for kernel RIO device object
1701  * @dev: kernel device object associated with a RIO device structure
1702  *
1703  * Frees a RIO device struct associated a RIO device struct.
1704  * The RIO device struct is freed.
1705  */
1706 static void rio_release_dev(struct device *dev)
1707 {
1708         struct rio_dev *rdev;
1709
1710         rdev = to_rio_dev(dev);
1711         pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1712         kfree(rdev);
1713 }
1714
1715
1716 static void rio_release_net(struct device *dev)
1717 {
1718         struct rio_net *net;
1719
1720         net = to_rio_net(dev);
1721         rmcd_debug(RDEV, "net_%d", net->id);
1722         kfree(net);
1723 }
1724
1725
1726 /*
1727  * rio_mport_add_riodev - creates a kernel RIO device object
1728  *
1729  * Allocates a RIO device data structure and initializes required fields based
1730  * on device's configuration space contents.
1731  * If the device has switch capabilities, then a switch specific portion is
1732  * allocated and configured.
1733  */
1734 static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
1735                                    void __user *arg)
1736 {
1737         struct mport_dev *md = priv->md;
1738         struct rio_rdev_info dev_info;
1739         struct rio_dev *rdev;
1740         struct rio_switch *rswitch = NULL;
1741         struct rio_mport *mport;
1742         struct device *dev;
1743         size_t size;
1744         u32 rval;
1745         u32 swpinfo = 0;
1746         u16 destid;
1747         u8 hopcount;
1748         int err;
1749
1750         if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1751                 return -EFAULT;
1752         dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1753
1754         rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1755                    dev_info.comptag, dev_info.destid, dev_info.hopcount);
1756
1757         dev = bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name);
1758         if (dev) {
1759                 rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1760                 put_device(dev);
1761                 return -EEXIST;
1762         }
1763
1764         size = sizeof(*rdev);
1765         mport = md->mport;
1766         destid = dev_info.destid;
1767         hopcount = dev_info.hopcount;
1768
1769         if (rio_mport_read_config_32(mport, destid, hopcount,
1770                                      RIO_PEF_CAR, &rval))
1771                 return -EIO;
1772
1773         if (rval & RIO_PEF_SWITCH) {
1774                 rio_mport_read_config_32(mport, destid, hopcount,
1775                                          RIO_SWP_INFO_CAR, &swpinfo);
1776                 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
1777                          sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
1778         }
1779
1780         rdev = kzalloc(size, GFP_KERNEL);
1781         if (rdev == NULL)
1782                 return -ENOMEM;
1783
1784         if (mport->net == NULL) {
1785                 struct rio_net *net;
1786
1787                 net = rio_alloc_net(mport);
1788                 if (!net) {
1789                         err = -ENOMEM;
1790                         rmcd_debug(RDEV, "failed to allocate net object");
1791                         goto cleanup;
1792                 }
1793
1794                 net->id = mport->id;
1795                 net->hport = mport;
1796                 dev_set_name(&net->dev, "rnet_%d", net->id);
1797                 net->dev.parent = &mport->dev;
1798                 net->dev.release = rio_release_net;
1799                 err = rio_add_net(net);
1800                 if (err) {
1801                         rmcd_debug(RDEV, "failed to register net, err=%d", err);
1802                         kfree(net);
1803                         goto cleanup;
1804                 }
1805         }
1806
1807         rdev->net = mport->net;
1808         rdev->pef = rval;
1809         rdev->swpinfo = swpinfo;
1810         rio_mport_read_config_32(mport, destid, hopcount,
1811                                  RIO_DEV_ID_CAR, &rval);
1812         rdev->did = rval >> 16;
1813         rdev->vid = rval & 0xffff;
1814         rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1815                                  &rdev->device_rev);
1816         rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1817                                  &rval);
1818         rdev->asm_did = rval >> 16;
1819         rdev->asm_vid = rval & 0xffff;
1820         rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1821                                  &rval);
1822         rdev->asm_rev = rval >> 16;
1823
1824         if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1825                 rdev->efptr = rval & 0xffff;
1826                 rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1827                                                 hopcount, &rdev->phys_rmap);
1828
1829                 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1830                                                 hopcount, RIO_EFB_ERR_MGMNT);
1831         }
1832
1833         rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1834                                  &rdev->src_ops);
1835         rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1836                                  &rdev->dst_ops);
1837
1838         rdev->comp_tag = dev_info.comptag;
1839         rdev->destid = destid;
1840         /* hopcount is stored as specified by a caller, regardles of EP or SW */
1841         rdev->hopcount = hopcount;
1842
1843         if (rdev->pef & RIO_PEF_SWITCH) {
1844                 rswitch = rdev->rswitch;
1845                 rswitch->route_table = NULL;
1846         }
1847
1848         if (strlen(dev_info.name))
1849                 dev_set_name(&rdev->dev, "%s", dev_info.name);
1850         else if (rdev->pef & RIO_PEF_SWITCH)
1851                 dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1852                              rdev->comp_tag & RIO_CTAG_UDEVID);
1853         else
1854                 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1855                              rdev->comp_tag & RIO_CTAG_UDEVID);
1856
1857         INIT_LIST_HEAD(&rdev->net_list);
1858         rdev->dev.parent = &mport->net->dev;
1859         rio_attach_device(rdev);
1860         rdev->dev.release = rio_release_dev;
1861
1862         if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1863                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1864                                    0, 0xffff);
1865         err = rio_add_device(rdev);
1866         if (err)
1867                 goto cleanup;
1868         rio_dev_get(rdev);
1869
1870         return 0;
1871 cleanup:
1872         kfree(rdev);
1873         return err;
1874 }
1875
1876 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1877 {
1878         struct rio_rdev_info dev_info;
1879         struct rio_dev *rdev = NULL;
1880         struct device  *dev;
1881         struct rio_mport *mport;
1882         struct rio_net *net;
1883
1884         if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1885                 return -EFAULT;
1886         dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1887
1888         mport = priv->md->mport;
1889
1890         /* If device name is specified, removal by name has priority */
1891         if (strlen(dev_info.name)) {
1892                 dev = bus_find_device_by_name(&rio_bus_type, NULL,
1893                                               dev_info.name);
1894                 if (dev)
1895                         rdev = to_rio_dev(dev);
1896         } else {
1897                 do {
1898                         rdev = rio_get_comptag(dev_info.comptag, rdev);
1899                         if (rdev && rdev->dev.parent == &mport->net->dev &&
1900                             rdev->destid == dev_info.destid &&
1901                             rdev->hopcount == dev_info.hopcount)
1902                                 break;
1903                 } while (rdev);
1904         }
1905
1906         if (!rdev) {
1907                 rmcd_debug(RDEV,
1908                         "device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1909                         dev_info.name, dev_info.comptag, dev_info.destid,
1910                         dev_info.hopcount);
1911                 return -ENODEV;
1912         }
1913
1914         net = rdev->net;
1915         rio_dev_put(rdev);
1916         rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1917
1918         if (list_empty(&net->devices)) {
1919                 rio_free_net(net);
1920                 mport->net = NULL;
1921         }
1922
1923         return 0;
1924 }
1925
1926 /*
1927  * Mport cdev management
1928  */
1929
1930 /*
1931  * mport_cdev_open() - Open character device (mport)
1932  */
1933 static int mport_cdev_open(struct inode *inode, struct file *filp)
1934 {
1935         int ret;
1936         int minor = iminor(inode);
1937         struct mport_dev *chdev;
1938         struct mport_cdev_priv *priv;
1939
1940         /* Test for valid device */
1941         if (minor >= RIO_MAX_MPORTS) {
1942                 rmcd_error("Invalid minor device number");
1943                 return -EINVAL;
1944         }
1945
1946         chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1947
1948         rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1949
1950         if (atomic_read(&chdev->active) == 0)
1951                 return -ENODEV;
1952
1953         get_device(&chdev->dev);
1954
1955         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1956         if (!priv) {
1957                 put_device(&chdev->dev);
1958                 return -ENOMEM;
1959         }
1960
1961         priv->md = chdev;
1962
1963         mutex_lock(&chdev->file_mutex);
1964         list_add_tail(&priv->list, &chdev->file_list);
1965         mutex_unlock(&chdev->file_mutex);
1966
1967         INIT_LIST_HEAD(&priv->db_filters);
1968         INIT_LIST_HEAD(&priv->pw_filters);
1969         spin_lock_init(&priv->fifo_lock);
1970         init_waitqueue_head(&priv->event_rx_wait);
1971         ret = kfifo_alloc(&priv->event_fifo,
1972                           sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
1973                           GFP_KERNEL);
1974         if (ret < 0) {
1975                 dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
1976                 ret = -ENOMEM;
1977                 goto err_fifo;
1978         }
1979
1980 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1981         INIT_LIST_HEAD(&priv->async_list);
1982         INIT_LIST_HEAD(&priv->pend_list);
1983         spin_lock_init(&priv->req_lock);
1984         mutex_init(&priv->dma_lock);
1985 #endif
1986
1987         filp->private_data = priv;
1988         goto out;
1989 err_fifo:
1990         kfree(priv);
1991 out:
1992         return ret;
1993 }
1994
1995 static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1996 {
1997         struct mport_cdev_priv *priv = filp->private_data;
1998
1999         return fasync_helper(fd, filp, mode, &priv->async_queue);
2000 }
2001
2002 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2003 static void mport_cdev_release_dma(struct file *filp)
2004 {
2005         struct mport_cdev_priv *priv = filp->private_data;
2006         struct mport_dev *md;
2007         struct mport_dma_req *req, *req_next;
2008         unsigned long tmo = msecs_to_jiffies(dma_timeout);
2009         long wret;
2010         LIST_HEAD(list);
2011
2012         rmcd_debug(EXIT, "from filp=%p %s(%d)",
2013                    filp, current->comm, task_pid_nr(current));
2014
2015         if (!priv->dmach) {
2016                 rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
2017                 return;
2018         }
2019
2020         md = priv->md;
2021
2022         flush_workqueue(dma_wq);
2023
2024         spin_lock(&priv->req_lock);
2025         if (!list_empty(&priv->async_list)) {
2026                 rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
2027                            filp, current->comm, task_pid_nr(current));
2028                 list_splice_init(&priv->async_list, &list);
2029         }
2030         spin_unlock(&priv->req_lock);
2031
2032         if (!list_empty(&list)) {
2033                 rmcd_debug(EXIT, "temp list not empty");
2034                 list_for_each_entry_safe(req, req_next, &list, node) {
2035                         rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
2036                                    req->filp, req->cookie,
2037                                    completion_done(&req->req_comp)?"yes":"no");
2038                         list_del(&req->node);
2039                         dma_req_free(req);
2040                 }
2041         }
2042
2043         if (!list_empty(&priv->pend_list)) {
2044                 rmcd_debug(EXIT, "Free pending DMA requests for filp=%p %s(%d)",
2045                            filp, current->comm, task_pid_nr(current));
2046                 list_for_each_entry_safe(req,
2047                                          req_next, &priv->pend_list, node) {
2048                         rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
2049                                    req->filp, req->cookie,
2050                                    completion_done(&req->req_comp)?"yes":"no");
2051                         list_del(&req->node);
2052                         dma_req_free(req);
2053                 }
2054         }
2055
2056         put_dma_channel(priv);
2057         wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
2058
2059         if (wret <= 0) {
2060                 rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
2061                         current->comm, task_pid_nr(current), wret);
2062         }
2063
2064         spin_lock(&priv->req_lock);
2065
2066         if (!list_empty(&priv->pend_list)) {
2067                 rmcd_debug(EXIT, "ATTN: pending DMA requests, filp=%p %s(%d)",
2068                            filp, current->comm, task_pid_nr(current));
2069         }
2070
2071         spin_unlock(&priv->req_lock);
2072
2073         if (priv->dmach != priv->md->dma_chan) {
2074                 rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
2075                            filp, current->comm, task_pid_nr(current));
2076                 rio_release_dma(priv->dmach);
2077         } else {
2078                 rmcd_debug(EXIT, "Adjust default DMA channel refcount");
2079                 kref_put(&md->dma_ref, mport_release_def_dma);
2080         }
2081
2082         priv->dmach = NULL;
2083 }
2084 #else
2085 #define mport_cdev_release_dma(priv) do {} while (0)
2086 #endif
2087
2088 /*
2089  * mport_cdev_release() - Release character device
2090  */
2091 static int mport_cdev_release(struct inode *inode, struct file *filp)
2092 {
2093         struct mport_cdev_priv *priv = filp->private_data;
2094         struct mport_dev *chdev;
2095         struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
2096         struct rio_mport_db_filter *db_filter, *db_filter_next;
2097         struct rio_mport_mapping *map, *_map;
2098         unsigned long flags;
2099
2100         rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2101
2102         chdev = priv->md;
2103         mport_cdev_release_dma(filp);
2104
2105         priv->event_mask = 0;
2106
2107         spin_lock_irqsave(&chdev->pw_lock, flags);
2108         if (!list_empty(&priv->pw_filters)) {
2109                 list_for_each_entry_safe(pw_filter, pw_filter_next,
2110                                          &priv->pw_filters, priv_node)
2111                         rio_mport_delete_pw_filter(pw_filter);
2112         }
2113         spin_unlock_irqrestore(&chdev->pw_lock, flags);
2114
2115         spin_lock_irqsave(&chdev->db_lock, flags);
2116         list_for_each_entry_safe(db_filter, db_filter_next,
2117                                  &priv->db_filters, priv_node) {
2118                 rio_mport_delete_db_filter(db_filter);
2119         }
2120         spin_unlock_irqrestore(&chdev->db_lock, flags);
2121
2122         kfifo_free(&priv->event_fifo);
2123
2124         mutex_lock(&chdev->buf_mutex);
2125         list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
2126                 if (map->filp == filp) {
2127                         rmcd_debug(EXIT, "release mapping %p filp=%p",
2128                                    map->virt_addr, filp);
2129                         kref_put(&map->ref, mport_release_mapping);
2130                 }
2131         }
2132         mutex_unlock(&chdev->buf_mutex);
2133
2134         mport_cdev_fasync(-1, filp, 0);
2135         filp->private_data = NULL;
2136         mutex_lock(&chdev->file_mutex);
2137         list_del(&priv->list);
2138         mutex_unlock(&chdev->file_mutex);
2139         put_device(&chdev->dev);
2140         kfree(priv);
2141         return 0;
2142 }
2143
2144 /*
2145  * mport_cdev_ioctl() - IOCTLs for character device
2146  */
2147 static long mport_cdev_ioctl(struct file *filp,
2148                 unsigned int cmd, unsigned long arg)
2149 {
2150         int err = -EINVAL;
2151         struct mport_cdev_priv *data = filp->private_data;
2152         struct mport_dev *md = data->md;
2153
2154         if (atomic_read(&md->active) == 0)
2155                 return -ENODEV;
2156
2157         switch (cmd) {
2158         case RIO_MPORT_MAINT_READ_LOCAL:
2159                 return rio_mport_maint_rd(data, (void __user *)arg, 1);
2160         case RIO_MPORT_MAINT_WRITE_LOCAL:
2161                 return rio_mport_maint_wr(data, (void __user *)arg, 1);
2162         case RIO_MPORT_MAINT_READ_REMOTE:
2163                 return rio_mport_maint_rd(data, (void __user *)arg, 0);
2164         case RIO_MPORT_MAINT_WRITE_REMOTE:
2165                 return rio_mport_maint_wr(data, (void __user *)arg, 0);
2166         case RIO_MPORT_MAINT_HDID_SET:
2167                 return maint_hdid_set(data, (void __user *)arg);
2168         case RIO_MPORT_MAINT_COMPTAG_SET:
2169                 return maint_comptag_set(data, (void __user *)arg);
2170         case RIO_MPORT_MAINT_PORT_IDX_GET:
2171                 return maint_port_idx_get(data, (void __user *)arg);
2172         case RIO_MPORT_GET_PROPERTIES:
2173                 md->properties.hdid = md->mport->host_deviceid;
2174                 if (copy_to_user((void __user *)arg, &(md->properties),
2175                                  sizeof(md->properties)))
2176                         return -EFAULT;
2177                 return 0;
2178         case RIO_ENABLE_DOORBELL_RANGE:
2179                 return rio_mport_add_db_filter(data, (void __user *)arg);
2180         case RIO_DISABLE_DOORBELL_RANGE:
2181                 return rio_mport_remove_db_filter(data, (void __user *)arg);
2182         case RIO_ENABLE_PORTWRITE_RANGE:
2183                 return rio_mport_add_pw_filter(data, (void __user *)arg);
2184         case RIO_DISABLE_PORTWRITE_RANGE:
2185                 return rio_mport_remove_pw_filter(data, (void __user *)arg);
2186         case RIO_SET_EVENT_MASK:
2187                 data->event_mask = (u32)arg;
2188                 return 0;
2189         case RIO_GET_EVENT_MASK:
2190                 if (copy_to_user((void __user *)arg, &data->event_mask,
2191                                     sizeof(u32)))
2192                         return -EFAULT;
2193                 return 0;
2194         case RIO_MAP_OUTBOUND:
2195                 return rio_mport_obw_map(filp, (void __user *)arg);
2196         case RIO_MAP_INBOUND:
2197                 return rio_mport_map_inbound(filp, (void __user *)arg);
2198         case RIO_UNMAP_OUTBOUND:
2199                 return rio_mport_obw_free(filp, (void __user *)arg);
2200         case RIO_UNMAP_INBOUND:
2201                 return rio_mport_inbound_free(filp, (void __user *)arg);
2202         case RIO_ALLOC_DMA:
2203                 return rio_mport_alloc_dma(filp, (void __user *)arg);
2204         case RIO_FREE_DMA:
2205                 return rio_mport_free_dma(filp, (void __user *)arg);
2206         case RIO_WAIT_FOR_ASYNC:
2207                 return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
2208         case RIO_TRANSFER:
2209                 return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2210         case RIO_DEV_ADD:
2211                 return rio_mport_add_riodev(data, (void __user *)arg);
2212         case RIO_DEV_DEL:
2213                 return rio_mport_del_riodev(data, (void __user *)arg);
2214         default:
2215                 break;
2216         }
2217
2218         return err;
2219 }
2220
2221 /*
2222  * mport_release_mapping - free mapping resources and info structure
2223  * @ref: a pointer to the kref within struct rio_mport_mapping
2224  *
2225  * NOTE: Shall be called while holding buf_mutex.
2226  */
2227 static void mport_release_mapping(struct kref *ref)
2228 {
2229         struct rio_mport_mapping *map =
2230                         container_of(ref, struct rio_mport_mapping, ref);
2231         struct rio_mport *mport = map->md->mport;
2232
2233         rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2234                    map->dir, map->virt_addr,
2235                    &map->phys_addr, mport->name);
2236
2237         list_del(&map->node);
2238
2239         switch (map->dir) {
2240         case MAP_INBOUND:
2241                 rio_unmap_inb_region(mport, map->phys_addr);
2242         case MAP_DMA:
2243                 dma_free_coherent(mport->dev.parent, map->size,
2244                                   map->virt_addr, map->phys_addr);
2245                 break;
2246         case MAP_OUTBOUND:
2247                 rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2248                 break;
2249         }
2250         kfree(map);
2251 }
2252
2253 static void mport_mm_open(struct vm_area_struct *vma)
2254 {
2255         struct rio_mport_mapping *map = vma->vm_private_data;
2256
2257         rmcd_debug(MMAP, "%pad", &map->phys_addr);
2258         kref_get(&map->ref);
2259 }
2260
2261 static void mport_mm_close(struct vm_area_struct *vma)
2262 {
2263         struct rio_mport_mapping *map = vma->vm_private_data;
2264
2265         rmcd_debug(MMAP, "%pad", &map->phys_addr);
2266         mutex_lock(&map->md->buf_mutex);
2267         kref_put(&map->ref, mport_release_mapping);
2268         mutex_unlock(&map->md->buf_mutex);
2269 }
2270
2271 static const struct vm_operations_struct vm_ops = {
2272         .open = mport_mm_open,
2273         .close = mport_mm_close,
2274 };
2275
2276 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2277 {
2278         struct mport_cdev_priv *priv = filp->private_data;
2279         struct mport_dev *md;
2280         size_t size = vma->vm_end - vma->vm_start;
2281         dma_addr_t baddr;
2282         unsigned long offset;
2283         int found = 0, ret;
2284         struct rio_mport_mapping *map;
2285
2286         rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2287                    (unsigned int)size, vma->vm_pgoff);
2288
2289         md = priv->md;
2290         baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
2291
2292         mutex_lock(&md->buf_mutex);
2293         list_for_each_entry(map, &md->mappings, node) {
2294                 if (baddr >= map->phys_addr &&
2295                     baddr < (map->phys_addr + map->size)) {
2296                         found = 1;
2297                         break;
2298                 }
2299         }
2300         mutex_unlock(&md->buf_mutex);
2301
2302         if (!found)
2303                 return -ENOMEM;
2304
2305         offset = baddr - map->phys_addr;
2306
2307         if (size + offset > map->size)
2308                 return -EINVAL;
2309
2310         vma->vm_pgoff = offset >> PAGE_SHIFT;
2311         rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
2312
2313         if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
2314                 ret = dma_mmap_coherent(md->mport->dev.parent, vma,
2315                                 map->virt_addr, map->phys_addr, map->size);
2316         else if (map->dir == MAP_OUTBOUND) {
2317                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
2318                 ret = vm_iomap_memory(vma, map->phys_addr, map->size);
2319         } else {
2320                 rmcd_error("Attempt to mmap unsupported mapping type");
2321                 ret = -EIO;
2322         }
2323
2324         if (!ret) {
2325                 vma->vm_private_data = map;
2326                 vma->vm_ops = &vm_ops;
2327                 mport_mm_open(vma);
2328         } else {
2329                 rmcd_error("MMAP exit with err=%d", ret);
2330         }
2331
2332         return ret;
2333 }
2334
2335 static unsigned int mport_cdev_poll(struct file *filp, poll_table *wait)
2336 {
2337         struct mport_cdev_priv *priv = filp->private_data;
2338
2339         poll_wait(filp, &priv->event_rx_wait, wait);
2340         if (kfifo_len(&priv->event_fifo))
2341                 return POLLIN | POLLRDNORM;
2342
2343         return 0;
2344 }
2345
2346 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2347                         loff_t *ppos)
2348 {
2349         struct mport_cdev_priv *priv = filp->private_data;
2350         int copied;
2351         ssize_t ret;
2352
2353         if (!count)
2354                 return 0;
2355
2356         if (kfifo_is_empty(&priv->event_fifo) &&
2357             (filp->f_flags & O_NONBLOCK))
2358                 return -EAGAIN;
2359
2360         if (count % sizeof(struct rio_event))
2361                 return -EINVAL;
2362
2363         ret = wait_event_interruptible(priv->event_rx_wait,
2364                                         kfifo_len(&priv->event_fifo) != 0);
2365         if (ret)
2366                 return ret;
2367
2368         while (ret < count) {
2369                 if (kfifo_to_user(&priv->event_fifo, buf,
2370                       sizeof(struct rio_event), &copied))
2371                         return -EFAULT;
2372                 ret += copied;
2373                 buf += copied;
2374         }
2375
2376         return ret;
2377 }
2378
2379 static ssize_t mport_write(struct file *filp, const char __user *buf,
2380                          size_t count, loff_t *ppos)
2381 {
2382         struct mport_cdev_priv *priv = filp->private_data;
2383         struct rio_mport *mport = priv->md->mport;
2384         struct rio_event event;
2385         int len, ret;
2386
2387         if (!count)
2388                 return 0;
2389
2390         if (count % sizeof(event))
2391                 return -EINVAL;
2392
2393         len = 0;
2394         while ((count - len) >= (int)sizeof(event)) {
2395                 if (copy_from_user(&event, buf, sizeof(event)))
2396                         return -EFAULT;
2397
2398                 if (event.header != RIO_DOORBELL)
2399                         return -EINVAL;
2400
2401                 ret = rio_mport_send_doorbell(mport,
2402                                               event.u.doorbell.rioid,
2403                                               event.u.doorbell.payload);
2404                 if (ret < 0)
2405                         return ret;
2406
2407                 len += sizeof(event);
2408                 buf += sizeof(event);
2409         }
2410
2411         return len;
2412 }
2413
2414 static const struct file_operations mport_fops = {
2415         .owner          = THIS_MODULE,
2416         .open           = mport_cdev_open,
2417         .release        = mport_cdev_release,
2418         .poll           = mport_cdev_poll,
2419         .read           = mport_read,
2420         .write          = mport_write,
2421         .mmap           = mport_cdev_mmap,
2422         .fasync         = mport_cdev_fasync,
2423         .unlocked_ioctl = mport_cdev_ioctl
2424 };
2425
2426 /*
2427  * Character device management
2428  */
2429
2430 static void mport_device_release(struct device *dev)
2431 {
2432         struct mport_dev *md;
2433
2434         rmcd_debug(EXIT, "%s", dev_name(dev));
2435         md = container_of(dev, struct mport_dev, dev);
2436         kfree(md);
2437 }
2438
2439 /*
2440  * mport_cdev_add() - Create mport_dev from rio_mport
2441  * @mport:      RapidIO master port
2442  */
2443 static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2444 {
2445         int ret = 0;
2446         struct mport_dev *md;
2447         struct rio_mport_attr attr;
2448
2449         md = kzalloc(sizeof(*md), GFP_KERNEL);
2450         if (!md) {
2451                 rmcd_error("Unable allocate a device object");
2452                 return NULL;
2453         }
2454
2455         md->mport = mport;
2456         mutex_init(&md->buf_mutex);
2457         mutex_init(&md->file_mutex);
2458         INIT_LIST_HEAD(&md->file_list);
2459
2460         device_initialize(&md->dev);
2461         md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
2462         md->dev.class = dev_class;
2463         md->dev.parent = &mport->dev;
2464         md->dev.release = mport_device_release;
2465         dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
2466         atomic_set(&md->active, 1);
2467
2468         cdev_init(&md->cdev, &mport_fops);
2469         md->cdev.owner = THIS_MODULE;
2470
2471         INIT_LIST_HEAD(&md->doorbells);
2472         spin_lock_init(&md->db_lock);
2473         INIT_LIST_HEAD(&md->portwrites);
2474         spin_lock_init(&md->pw_lock);
2475         INIT_LIST_HEAD(&md->mappings);
2476
2477         md->properties.id = mport->id;
2478         md->properties.sys_size = mport->sys_size;
2479         md->properties.hdid = mport->host_deviceid;
2480         md->properties.index = mport->index;
2481
2482         /* The transfer_mode property will be returned through mport query
2483          * interface
2484          */
2485 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2486         md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2487 #else
2488         md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2489 #endif
2490
2491         ret = cdev_device_add(&md->cdev, &md->dev);
2492         if (ret) {
2493                 rmcd_error("Failed to register mport %d (err=%d)",
2494                        mport->id, ret);
2495                 goto err_cdev;
2496         }
2497         ret = rio_query_mport(mport, &attr);
2498         if (!ret) {
2499                 md->properties.flags = attr.flags;
2500                 md->properties.link_speed = attr.link_speed;
2501                 md->properties.link_width = attr.link_width;
2502                 md->properties.dma_max_sge = attr.dma_max_sge;
2503                 md->properties.dma_max_size = attr.dma_max_size;
2504                 md->properties.dma_align = attr.dma_align;
2505                 md->properties.cap_sys_size = 0;
2506                 md->properties.cap_transfer_mode = 0;
2507                 md->properties.cap_addr_size = 0;
2508         } else
2509                 pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2510                         mport->name, MAJOR(dev_number), mport->id);
2511
2512         mutex_lock(&mport_devs_lock);
2513         list_add_tail(&md->node, &mport_devs);
2514         mutex_unlock(&mport_devs_lock);
2515
2516         pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2517                 mport->name, MAJOR(dev_number), mport->id);
2518
2519         return md;
2520
2521 err_cdev:
2522         put_device(&md->dev);
2523         return NULL;
2524 }
2525
2526 /*
2527  * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2528  *                              associated DMA channels.
2529  */
2530 static void mport_cdev_terminate_dma(struct mport_dev *md)
2531 {
2532 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2533         struct mport_cdev_priv *client;
2534
2535         rmcd_debug(DMA, "%s", dev_name(&md->dev));
2536
2537         mutex_lock(&md->file_mutex);
2538         list_for_each_entry(client, &md->file_list, list) {
2539                 if (client->dmach) {
2540                         dmaengine_terminate_all(client->dmach);
2541                         rio_release_dma(client->dmach);
2542                 }
2543         }
2544         mutex_unlock(&md->file_mutex);
2545
2546         if (md->dma_chan) {
2547                 dmaengine_terminate_all(md->dma_chan);
2548                 rio_release_dma(md->dma_chan);
2549                 md->dma_chan = NULL;
2550         }
2551 #endif
2552 }
2553
2554
2555 /*
2556  * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2557  *                            mport_cdev files.
2558  */
2559 static int mport_cdev_kill_fasync(struct mport_dev *md)
2560 {
2561         unsigned int files = 0;
2562         struct mport_cdev_priv *client;
2563
2564         mutex_lock(&md->file_mutex);
2565         list_for_each_entry(client, &md->file_list, list) {
2566                 if (client->async_queue)
2567                         kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
2568                 files++;
2569         }
2570         mutex_unlock(&md->file_mutex);
2571         return files;
2572 }
2573
2574 /*
2575  * mport_cdev_remove() - Remove mport character device
2576  * @dev:        Mport device to remove
2577  */
2578 static void mport_cdev_remove(struct mport_dev *md)
2579 {
2580         struct rio_mport_mapping *map, *_map;
2581
2582         rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
2583         atomic_set(&md->active, 0);
2584         mport_cdev_terminate_dma(md);
2585         rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2586         cdev_device_del(&md->cdev, &md->dev);
2587         mport_cdev_kill_fasync(md);
2588
2589         flush_workqueue(dma_wq);
2590
2591         /* TODO: do we need to give clients some time to close file
2592          * descriptors? Simple wait for XX, or kref?
2593          */
2594
2595         /*
2596          * Release DMA buffers allocated for the mport device.
2597          * Disable associated inbound Rapidio requests mapping if applicable.
2598          */
2599         mutex_lock(&md->buf_mutex);
2600         list_for_each_entry_safe(map, _map, &md->mappings, node) {
2601                 kref_put(&map->ref, mport_release_mapping);
2602         }
2603         mutex_unlock(&md->buf_mutex);
2604
2605         if (!list_empty(&md->mappings))
2606                 rmcd_warn("WARNING: %s pending mappings on removal",
2607                           md->mport->name);
2608
2609         rio_release_inb_dbell(md->mport, 0, 0x0fff);
2610
2611         put_device(&md->dev);
2612 }
2613
2614 /*
2615  * RIO rio_mport_interface driver
2616  */
2617
2618 /*
2619  * mport_add_mport() - Add rio_mport from LDM device struct
2620  * @dev:                Linux device model struct
2621  * @class_intf: Linux class_interface
2622  */
2623 static int mport_add_mport(struct device *dev,
2624                 struct class_interface *class_intf)
2625 {
2626         struct rio_mport *mport = NULL;
2627         struct mport_dev *chdev = NULL;
2628
2629         mport = to_rio_mport(dev);
2630         if (!mport)
2631                 return -ENODEV;
2632
2633         chdev = mport_cdev_add(mport);
2634         if (!chdev)
2635                 return -ENODEV;
2636
2637         return 0;
2638 }
2639
2640 /*
2641  * mport_remove_mport() - Remove rio_mport from global list
2642  * TODO remove device from global mport_dev list
2643  */
2644 static void mport_remove_mport(struct device *dev,
2645                 struct class_interface *class_intf)
2646 {
2647         struct rio_mport *mport = NULL;
2648         struct mport_dev *chdev;
2649         int found = 0;
2650
2651         mport = to_rio_mport(dev);
2652         rmcd_debug(EXIT, "Remove %s", mport->name);
2653
2654         mutex_lock(&mport_devs_lock);
2655         list_for_each_entry(chdev, &mport_devs, node) {
2656                 if (chdev->mport->id == mport->id) {
2657                         atomic_set(&chdev->active, 0);
2658                         list_del(&chdev->node);
2659                         found = 1;
2660                         break;
2661                 }
2662         }
2663         mutex_unlock(&mport_devs_lock);
2664
2665         if (found)
2666                 mport_cdev_remove(chdev);
2667 }
2668
2669 /* the rio_mport_interface is used to handle local mport devices */
2670 static struct class_interface rio_mport_interface __refdata = {
2671         .class          = &rio_mport_class,
2672         .add_dev        = mport_add_mport,
2673         .remove_dev     = mport_remove_mport,
2674 };
2675
2676 /*
2677  * Linux kernel module
2678  */
2679
2680 /*
2681  * mport_init - Driver module loading
2682  */
2683 static int __init mport_init(void)
2684 {
2685         int ret;
2686
2687         /* Create device class needed by udev */
2688         dev_class = class_create(THIS_MODULE, DRV_NAME);
2689         if (IS_ERR(dev_class)) {
2690                 rmcd_error("Unable to create " DRV_NAME " class");
2691                 return PTR_ERR(dev_class);
2692         }
2693
2694         ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2695         if (ret < 0)
2696                 goto err_chr;
2697
2698         rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2699
2700         /* Register to rio_mport_interface */
2701         ret = class_interface_register(&rio_mport_interface);
2702         if (ret) {
2703                 rmcd_error("class_interface_register() failed, err=%d", ret);
2704                 goto err_cli;
2705         }
2706
2707         dma_wq = create_singlethread_workqueue("dma_wq");
2708         if (!dma_wq) {
2709                 rmcd_error("failed to create DMA work queue");
2710                 ret = -ENOMEM;
2711                 goto err_wq;
2712         }
2713
2714         return 0;
2715
2716 err_wq:
2717         class_interface_unregister(&rio_mport_interface);
2718 err_cli:
2719         unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2720 err_chr:
2721         class_destroy(dev_class);
2722         return ret;
2723 }
2724
2725 /**
2726  * mport_exit - Driver module unloading
2727  */
2728 static void __exit mport_exit(void)
2729 {
2730         class_interface_unregister(&rio_mport_interface);
2731         class_destroy(dev_class);
2732         unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2733         destroy_workqueue(dma_wq);
2734 }
2735
2736 module_init(mport_init);
2737 module_exit(mport_exit);