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                 down_read(&current->mm->mmap_sem);
 893                 pinned = get_user_pages(
 894                                 (unsigned long)xfer->loc_addr & PAGE_MASK,
 895                                 nr_pages,
 896                                 dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
 897                                 page_list, NULL);
 898                 up_read(&current->mm->mmap_sem);
 899
 900                 if (pinned != nr_pages) {
 901                         if (pinned < 0) {
 902                                 rmcd_error("get_user_pages err=%ld", pinned);
 903                                 nr_pages = 0;
 904                         } else
 905                                 rmcd_error("pinned %ld out of %ld pages",
 906                                            pinned, nr_pages);
 907                         ret = -EFAULT;
 908                         goto err_pg;
 909                 }
 910
 911                 ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
 912                                         offset, xfer->length, GFP_KERNEL);
 913                 if (ret) {
 914                         rmcd_error("sg_alloc_table failed with err=%d", ret);
 915                         goto err_pg;
 916                 }
 917
 918                 req->page_list = page_list;
 919                 req->nr_pages = nr_pages;
 920         } else {
 921                 dma_addr_t baddr;
 922                 struct rio_mport_mapping *map;
 923
 924                 baddr = (dma_addr_t)xfer->handle;
 925
 926                 mutex_lock(&md->buf_mutex);
 927                 list_for_each_entry(map, &md->mappings, node) {
 928                         if (baddr >= map->phys_addr &&
 929                             baddr < (map->phys_addr + map->size)) {
 930                                 kref_get(&map->ref);
 931                                 req->map = map;
 932                                 break;
 933                         }
 934                 }
 935                 mutex_unlock(&md->buf_mutex);
 936
 937                 if (req->map == NULL) {
 938                         ret = -ENOMEM;
 939                         goto err_req;
 940                 }
 941
 942                 if (xfer->length + xfer->offset > map->size) {
 943                         ret = -EINVAL;
 944                         goto err_req;
 945                 }
 946
 947                 ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
 948                 if (unlikely(ret)) {
 949                         rmcd_error("sg_alloc_table failed for internal buf");
 950                         goto err_req;
 951                 }
 952
 953                 sg_set_buf(req->sgt.sgl,
 954                            map->virt_addr + (baddr - map->phys_addr) +
 955                                 xfer->offset, xfer->length);
 956         }
 957
 958         req->dir = dir;
 959         req->filp = filp;
 960         req->priv = priv;
 961         chan = priv->dmach;
 962
 963         nents = dma_map_sg(chan->device->dev,
 964                            req->sgt.sgl, req->sgt.nents, dir);
 965         if (nents == -EFAULT) {
 966                 rmcd_error("Failed to map SG list");
 967                 return -EFAULT;
 968         }
 969
 970         ret = do_dma_request(req, xfer, sync, nents);
 971
 972         if (ret >= 0) {
 973                 if (sync == RIO_TRANSFER_SYNC)
 974                         goto sync_out;
 975                 return ret; /* return ASYNC cookie */
 976         }
 977
 978         if (ret == -ETIMEDOUT || ret == -EINTR) {
 979                 /*
 980                  * This can happen only in case of SYNC transfer.
 981                  * Do not free unfinished request structure immediately.
 982                  * Place it into pending list and deal with it later
 983                  */
 984                 spin_lock(&priv->req_lock);
 985                 list_add_tail(&req->node, &priv->pend_list);
 986                 spin_unlock(&priv->req_lock);
 987                 return ret;
 988         }
 989
 990
 991         rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
 992 sync_out:
 993         dma_unmap_sg(chan->device->dev, req->sgt.sgl, req->sgt.nents, dir);
 994         sg_free_table(&req->sgt);
 995 err_pg:
 996         if (page_list) {
 997                 for (i = 0; i < nr_pages; i++)
 998                         put_page(page_list[i]);
 999                 kfree(page_list);
1000         }
1001 err_req:
1002         if (req->map) {
1003                 mutex_lock(&md->buf_mutex);
1004                 kref_put(&req->map->ref, mport_release_mapping);
1005                 mutex_unlock(&md->buf_mutex);
1006         }
1007         put_dma_channel(priv);
1008         kfree(req);
1009         return ret;
1010 }
1011
1012 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
1013 {
1014         struct mport_cdev_priv *priv = filp->private_data;
1015         struct rio_transaction transaction;
1016         struct rio_transfer_io *transfer;
1017         enum dma_data_direction dir;
1018         int i, ret = 0;
1019
1020         if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
1021                 return -EFAULT;
1022
1023         if (transaction.count != 1) /* only single transfer for now */
1024                 return -EINVAL;
1025
1026         if ((transaction.transfer_mode &
1027              priv->md->properties.transfer_mode) == 0)
1028                 return -ENODEV;
1029
1030         transfer = vmalloc(transaction.count * sizeof(*transfer));
1031         if (!transfer)
1032                 return -ENOMEM;
1033
1034         if (unlikely(copy_from_user(transfer,
1035                                     (void __user *)(uintptr_t)transaction.block,
1036                                     transaction.count * sizeof(*transfer)))) {
1037                 ret = -EFAULT;
1038                 goto out_free;
1039         }
1040
1041         dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
1042                                         DMA_FROM_DEVICE : DMA_TO_DEVICE;
1043         for (i = 0; i < transaction.count && ret == 0; i++)
1044                 ret = rio_dma_transfer(filp, transaction.transfer_mode,
1045                         transaction.sync, dir, &transfer[i]);
1046
1047         if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
1048                                   transfer,
1049                                   transaction.count * sizeof(*transfer))))
1050                 ret = -EFAULT;
1051
1052 out_free:
1053         vfree(transfer);
1054
1055         return ret;
1056 }
1057
1058 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1059 {
1060         struct mport_cdev_priv *priv;
1061         struct mport_dev *md;
1062         struct rio_async_tx_wait w_param;
1063         struct mport_dma_req *req;
1064         dma_cookie_t cookie;
1065         unsigned long tmo;
1066         long wret;
1067         int found = 0;
1068         int ret;
1069
1070         priv = (struct mport_cdev_priv *)filp->private_data;
1071         md = priv->md;
1072
1073         if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
1074                 return -EFAULT;
1075
1076         cookie = w_param.token;
1077         if (w_param.timeout)
1078                 tmo = msecs_to_jiffies(w_param.timeout);
1079         else /* Use default DMA timeout */
1080                 tmo = msecs_to_jiffies(dma_timeout);
1081
1082         spin_lock(&priv->req_lock);
1083         list_for_each_entry(req, &priv->async_list, node) {
1084                 if (req->cookie == cookie) {
1085                         list_del(&req->node);
1086                         found = 1;
1087                         break;
1088                 }
1089         }
1090         spin_unlock(&priv->req_lock);
1091
1092         if (!found)
1093                 return -EAGAIN;
1094
1095         wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
1096
1097         if (wret == 0) {
1098                 /* Timeout on wait occurred */
1099                 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1100                        current->comm, task_pid_nr(current),
1101                        (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1102                 ret = -ETIMEDOUT;
1103                 goto err_tmo;
1104         } else if (wret == -ERESTARTSYS) {
1105                 /* Wait_for_completion was interrupted by a signal but DMA may
1106                  * be still in progress
1107                  */
1108                 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1109                         current->comm, task_pid_nr(current),
1110                         (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1111                 ret = -EINTR;
1112                 goto err_tmo;
1113         }
1114
1115         if (req->status != DMA_COMPLETE) {
1116                 /* DMA transaction completion signaled with transfer error */
1117                 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1118                         current->comm, task_pid_nr(current),
1119                         (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
1120                         req->status);
1121                 ret = -EIO;
1122         } else
1123                 ret = 0;
1124
1125         if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1126                 dma_req_free(req);
1127
1128         return ret;
1129
1130 err_tmo:
1131         /* Return request back into async queue */
1132         spin_lock(&priv->req_lock);
1133         list_add_tail(&req->node, &priv->async_list);
1134         spin_unlock(&priv->req_lock);
1135         return ret;
1136 }
1137
1138 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1139                         u64 size, struct rio_mport_mapping **mapping)
1140 {
1141         struct rio_mport_mapping *map;
1142
1143         map = kzalloc(sizeof(*map), GFP_KERNEL);
1144         if (map == NULL)
1145                 return -ENOMEM;
1146
1147         map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1148                                             &map->phys_addr, GFP_KERNEL);
1149         if (map->virt_addr == NULL) {
1150                 kfree(map);
1151                 return -ENOMEM;
1152         }
1153
1154         map->dir = MAP_DMA;
1155         map->size = size;
1156         map->filp = filp;
1157         map->md = md;
1158         kref_init(&map->ref);
1159         mutex_lock(&md->buf_mutex);
1160         list_add_tail(&map->node, &md->mappings);
1161         mutex_unlock(&md->buf_mutex);
1162         *mapping = map;
1163
1164         return 0;
1165 }
1166
1167 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1168 {
1169         struct mport_cdev_priv *priv = filp->private_data;
1170         struct mport_dev *md = priv->md;
1171         struct rio_dma_mem map;
1172         struct rio_mport_mapping *mapping = NULL;
1173         int ret;
1174
1175         if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1176                 return -EFAULT;
1177
1178         ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1179         if (ret)
1180                 return ret;
1181
1182         map.dma_handle = mapping->phys_addr;
1183
1184         if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1185                 mutex_lock(&md->buf_mutex);
1186                 kref_put(&mapping->ref, mport_release_mapping);
1187                 mutex_unlock(&md->buf_mutex);
1188                 return -EFAULT;
1189         }
1190
1191         return 0;
1192 }
1193
1194 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1195 {
1196         struct mport_cdev_priv *priv = filp->private_data;
1197         struct mport_dev *md = priv->md;
1198         u64 handle;
1199         int ret = -EFAULT;
1200         struct rio_mport_mapping *map, *_map;
1201
1202         if (copy_from_user(&handle, arg, sizeof(handle)))
1203                 return -EFAULT;
1204         rmcd_debug(EXIT, "filp=%p", filp);
1205
1206         mutex_lock(&md->buf_mutex);
1207         list_for_each_entry_safe(map, _map, &md->mappings, node) {
1208                 if (map->dir == MAP_DMA && map->phys_addr == handle &&
1209                     map->filp == filp) {
1210                         kref_put(&map->ref, mport_release_mapping);
1211                         ret = 0;
1212                         break;
1213                 }
1214         }
1215         mutex_unlock(&md->buf_mutex);
1216
1217         if (ret == -EFAULT) {
1218                 rmcd_debug(DMA, "ERR no matching mapping");
1219                 return ret;
1220         }
1221
1222         return 0;
1223 }
1224 #else
1225 static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1226 {
1227         return -ENODEV;
1228 }
1229
1230 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1231 {
1232         return -ENODEV;
1233 }
1234
1235 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1236 {
1237         return -ENODEV;
1238 }
1239
1240 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1241 {
1242         return -ENODEV;
1243 }
1244 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1245
1246 /*
1247  * Inbound/outbound memory mapping functions
1248  */
1249
1250 static int
1251 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1252                                 u64 raddr, u64 size,
1253                                 struct rio_mport_mapping **mapping)
1254 {
1255         struct rio_mport *mport = md->mport;
1256         struct rio_mport_mapping *map;
1257         int ret;
1258
1259         /* rio_map_inb_region() accepts u32 size */
1260         if (size > 0xffffffff)
1261                 return -EINVAL;
1262
1263         map = kzalloc(sizeof(*map), GFP_KERNEL);
1264         if (map == NULL)
1265                 return -ENOMEM;
1266
1267         map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1268                                             &map->phys_addr, GFP_KERNEL);
1269         if (map->virt_addr == NULL) {
1270                 ret = -ENOMEM;
1271                 goto err_dma_alloc;
1272         }
1273
1274         if (raddr == RIO_MAP_ANY_ADDR)
1275                 raddr = map->phys_addr;
1276         ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1277         if (ret < 0)
1278                 goto err_map_inb;
1279
1280         map->dir = MAP_INBOUND;
1281         map->rio_addr = raddr;
1282         map->size = size;
1283         map->filp = filp;
1284         map->md = md;
1285         kref_init(&map->ref);
1286         mutex_lock(&md->buf_mutex);
1287         list_add_tail(&map->node, &md->mappings);
1288         mutex_unlock(&md->buf_mutex);
1289         *mapping = map;
1290         return 0;
1291
1292 err_map_inb:
1293         dma_free_coherent(mport->dev.parent, size,
1294                           map->virt_addr, map->phys_addr);
1295 err_dma_alloc:
1296         kfree(map);
1297         return ret;
1298 }
1299
1300 static int
1301 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1302                               u64 raddr, u64 size,
1303                               struct rio_mport_mapping **mapping)
1304 {
1305         struct rio_mport_mapping *map;
1306         int err = -ENOMEM;
1307
1308         if (raddr == RIO_MAP_ANY_ADDR)
1309                 goto get_new;
1310
1311         mutex_lock(&md->buf_mutex);
1312         list_for_each_entry(map, &md->mappings, node) {
1313                 if (map->dir != MAP_INBOUND)
1314                         continue;
1315                 if (raddr == map->rio_addr && size == map->size) {
1316                         /* allow exact match only */
1317                         *mapping = map;
1318                         err = 0;
1319                         break;
1320                 } else if (raddr < (map->rio_addr + map->size - 1) &&
1321                            (raddr + size) > map->rio_addr) {
1322                         err = -EBUSY;
1323                         break;
1324                 }
1325         }
1326         mutex_unlock(&md->buf_mutex);
1327
1328         if (err != -ENOMEM)
1329                 return err;
1330 get_new:
1331         /* not found, create new */
1332         return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1333 }
1334
1335 static int rio_mport_map_inbound(struct file *filp, void __user *arg)
1336 {
1337         struct mport_cdev_priv *priv = filp->private_data;
1338         struct mport_dev *md = priv->md;
1339         struct rio_mmap map;
1340         struct rio_mport_mapping *mapping = NULL;
1341         int ret;
1342
1343         if (!md->mport->ops->map_inb)
1344                 return -EPROTONOSUPPORT;
1345         if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1346                 return -EFAULT;
1347
1348         rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1349
1350         ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1351                                             map.length, &mapping);
1352         if (ret)
1353                 return ret;
1354
1355         map.handle = mapping->phys_addr;
1356         map.rio_addr = mapping->rio_addr;
1357
1358         if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1359                 /* Delete mapping if it was created by this request */
1360                 if (ret == 0 && mapping->filp == filp) {
1361                         mutex_lock(&md->buf_mutex);
1362                         kref_put(&mapping->ref, mport_release_mapping);
1363                         mutex_unlock(&md->buf_mutex);
1364                 }
1365                 return -EFAULT;
1366         }
1367
1368         return 0;
1369 }
1370
1371 /*
1372  * rio_mport_inbound_free() - unmap from RapidIO address space and free
1373  *                    previously allocated inbound DMA coherent buffer
1374  * @priv: driver private data
1375  * @arg:  buffer handle returned by allocation routine
1376  */
1377 static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1378 {
1379         struct mport_cdev_priv *priv = filp->private_data;
1380         struct mport_dev *md = priv->md;
1381         u64 handle;
1382         struct rio_mport_mapping *map, *_map;
1383
1384         rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1385
1386         if (!md->mport->ops->unmap_inb)
1387                 return -EPROTONOSUPPORT;
1388
1389         if (copy_from_user(&handle, arg, sizeof(handle)))
1390                 return -EFAULT;
1391
1392         mutex_lock(&md->buf_mutex);
1393         list_for_each_entry_safe(map, _map, &md->mappings, node) {
1394                 if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
1395                         if (map->filp == filp) {
1396                                 map->filp = NULL;
1397                                 kref_put(&map->ref, mport_release_mapping);
1398                         }
1399                         break;
1400                 }
1401         }
1402         mutex_unlock(&md->buf_mutex);
1403
1404         return 0;
1405 }
1406
1407 /*
1408  * maint_port_idx_get() - Get the port index of the mport instance
1409  * @priv: driver private data
1410  * @arg:  port index
1411  */
1412 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1413 {
1414         struct mport_dev *md = priv->md;
1415         u32 port_idx = md->mport->index;
1416
1417         rmcd_debug(MPORT, "port_index=%d", port_idx);
1418
1419         if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1420                 return -EFAULT;
1421
1422         return 0;
1423 }
1424
1425 static int rio_mport_add_event(struct mport_cdev_priv *priv,
1426                                struct rio_event *event)
1427 {
1428         int overflow;
1429
1430         if (!(priv->event_mask & event->header))
1431                 return -EACCES;
1432
1433         spin_lock(&priv->fifo_lock);
1434         overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
1435                 || kfifo_in(&priv->event_fifo, (unsigned char *)event,
1436                         sizeof(*event)) != sizeof(*event);
1437         spin_unlock(&priv->fifo_lock);
1438
1439         wake_up_interruptible(&priv->event_rx_wait);
1440
1441         if (overflow) {
1442                 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1443                 return -EBUSY;
1444         }
1445
1446         return 0;
1447 }
1448
1449 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1450                                        u16 src, u16 dst, u16 info)
1451 {
1452         struct mport_dev *data = dev_id;
1453         struct mport_cdev_priv *priv;
1454         struct rio_mport_db_filter *db_filter;
1455         struct rio_event event;
1456         int handled;
1457
1458         event.header = RIO_DOORBELL;
1459         event.u.doorbell.rioid = src;
1460         event.u.doorbell.payload = info;
1461
1462         handled = 0;
1463         spin_lock(&data->db_lock);
1464         list_for_each_entry(db_filter, &data->doorbells, data_node) {
1465                 if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1466                       db_filter->filter.rioid == src)) &&
1467                       info >= db_filter->filter.low &&
1468                       info <= db_filter->filter.high) {
1469                         priv = db_filter->priv;
1470                         rio_mport_add_event(priv, &event);
1471                         handled = 1;
1472                 }
1473         }
1474         spin_unlock(&data->db_lock);
1475
1476         if (!handled)
1477                 dev_warn(&data->dev,
1478                         "%s: spurious DB received from 0x%x, info=0x%04x\n",
1479                         __func__, src, info);
1480 }
1481
1482 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
1483                                    void __user *arg)
1484 {
1485         struct mport_dev *md = priv->md;
1486         struct rio_mport_db_filter *db_filter;
1487         struct rio_doorbell_filter filter;
1488         unsigned long flags;
1489         int ret;
1490
1491         if (copy_from_user(&filter, arg, sizeof(filter)))
1492                 return -EFAULT;
1493
1494         if (filter.low > filter.high)
1495                 return -EINVAL;
1496
1497         ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1498                                     rio_mport_doorbell_handler);
1499         if (ret) {
1500                 rmcd_error("%s failed to register IBDB, err=%d",
1501                            dev_name(&md->dev), ret);
1502                 return ret;
1503         }
1504
1505         db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
1506         if (db_filter == NULL) {
1507                 rio_release_inb_dbell(md->mport, filter.low, filter.high);
1508                 return -ENOMEM;
1509         }
1510
1511         db_filter->filter = filter;
1512         db_filter->priv = priv;
1513         spin_lock_irqsave(&md->db_lock, flags);
1514         list_add_tail(&db_filter->priv_node, &priv->db_filters);
1515         list_add_tail(&db_filter->data_node, &md->doorbells);
1516         spin_unlock_irqrestore(&md->db_lock, flags);
1517
1518         return 0;
1519 }
1520
1521 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1522 {
1523         list_del(&db_filter->data_node);
1524         list_del(&db_filter->priv_node);
1525         kfree(db_filter);
1526 }
1527
1528 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1529                                       void __user *arg)
1530 {
1531         struct rio_mport_db_filter *db_filter;
1532         struct rio_doorbell_filter filter;
1533         unsigned long flags;
1534         int ret = -EINVAL;
1535
1536         if (copy_from_user(&filter, arg, sizeof(filter)))
1537                 return -EFAULT;
1538
1539         if (filter.low > filter.high)
1540                 return -EINVAL;
1541
1542         spin_lock_irqsave(&priv->md->db_lock, flags);
1543         list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
1544                 if (db_filter->filter.rioid == filter.rioid &&
1545                     db_filter->filter.low == filter.low &&
1546                     db_filter->filter.high == filter.high) {
1547                         rio_mport_delete_db_filter(db_filter);
1548                         ret = 0;
1549                         break;
1550                 }
1551         }
1552         spin_unlock_irqrestore(&priv->md->db_lock, flags);
1553
1554         if (!ret)
1555                 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1556
1557         return ret;
1558 }
1559
1560 static int rio_mport_match_pw(union rio_pw_msg *msg,
1561                               struct rio_pw_filter *filter)
1562 {
1563         if ((msg->em.comptag & filter->mask) < filter->low ||
1564                 (msg->em.comptag & filter->mask) > filter->high)
1565                 return 0;
1566         return 1;
1567 }
1568
1569 static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1570                                 union rio_pw_msg *msg, int step)
1571 {
1572         struct mport_dev *md = context;
1573         struct mport_cdev_priv *priv;
1574         struct rio_mport_pw_filter *pw_filter;
1575         struct rio_event event;
1576         int handled;
1577
1578         event.header = RIO_PORTWRITE;
1579         memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
1580
1581         handled = 0;
1582         spin_lock(&md->pw_lock);
1583         list_for_each_entry(pw_filter, &md->portwrites, md_node) {
1584                 if (rio_mport_match_pw(msg, &pw_filter->filter)) {
1585                         priv = pw_filter->priv;
1586                         rio_mport_add_event(priv, &event);
1587                         handled = 1;
1588                 }
1589         }
1590         spin_unlock(&md->pw_lock);
1591
1592         if (!handled) {
1593                 printk_ratelimited(KERN_WARNING DRV_NAME
1594                         ": mport%d received spurious PW from 0x%08x\n",
1595                         mport->id, msg->em.comptag);
1596         }
1597
1598         return 0;
1599 }
1600
1601 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
1602                                    void __user *arg)
1603 {
1604         struct mport_dev *md = priv->md;
1605         struct rio_mport_pw_filter *pw_filter;
1606         struct rio_pw_filter filter;
1607         unsigned long flags;
1608         int hadd = 0;
1609
1610         if (copy_from_user(&filter, arg, sizeof(filter)))
1611                 return -EFAULT;
1612
1613         pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1614         if (pw_filter == NULL)
1615                 return -ENOMEM;
1616
1617         pw_filter->filter = filter;
1618         pw_filter->priv = priv;
1619         spin_lock_irqsave(&md->pw_lock, flags);
1620         if (list_empty(&md->portwrites))
1621                 hadd = 1;
1622         list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
1623         list_add_tail(&pw_filter->md_node, &md->portwrites);
1624         spin_unlock_irqrestore(&md->pw_lock, flags);
1625
1626         if (hadd) {
1627                 int ret;
1628
1629                 ret = rio_add_mport_pw_handler(md->mport, md,
1630                                                rio_mport_pw_handler);
1631                 if (ret) {
1632                         dev_err(&md->dev,
1633                                 "%s: failed to add IB_PW handler, err=%d\n",
1634                                 __func__, ret);
1635                         return ret;
1636                 }
1637                 rio_pw_enable(md->mport, 1);
1638         }
1639
1640         return 0;
1641 }
1642
1643 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1644 {
1645         list_del(&pw_filter->md_node);
1646         list_del(&pw_filter->priv_node);
1647         kfree(pw_filter);
1648 }
1649
1650 static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1651                                      struct rio_pw_filter *b)
1652 {
1653         if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1654                 return 1;
1655         return 0;
1656 }
1657
1658 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
1659                                       void __user *arg)
1660 {
1661         struct mport_dev *md = priv->md;
1662         struct rio_mport_pw_filter *pw_filter;
1663         struct rio_pw_filter filter;
1664         unsigned long flags;
1665         int ret = -EINVAL;
1666         int hdel = 0;
1667
1668         if (copy_from_user(&filter, arg, sizeof(filter)))
1669                 return -EFAULT;
1670
1671         spin_lock_irqsave(&md->pw_lock, flags);
1672         list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
1673                 if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
1674                         rio_mport_delete_pw_filter(pw_filter);
1675                         ret = 0;
1676                         break;
1677                 }
1678         }
1679
1680         if (list_empty(&md->portwrites))
1681                 hdel = 1;
1682         spin_unlock_irqrestore(&md->pw_lock, flags);
1683
1684         if (hdel) {
1685                 rio_del_mport_pw_handler(md->mport, priv->md,
1686                                          rio_mport_pw_handler);
1687                 rio_pw_enable(md->mport, 0);
1688         }
1689
1690         return ret;
1691 }
1692
1693 /*
1694  * rio_release_dev - release routine for kernel RIO device object
1695  * @dev: kernel device object associated with a RIO device structure
1696  *
1697  * Frees a RIO device struct associated a RIO device struct.
1698  * The RIO device struct is freed.
1699  */
1700 static void rio_release_dev(struct device *dev)
1701 {
1702         struct rio_dev *rdev;
1703
1704         rdev = to_rio_dev(dev);
1705         pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1706         kfree(rdev);
1707 }
1708
1709
1710 static void rio_release_net(struct device *dev)
1711 {
1712         struct rio_net *net;
1713
1714         net = to_rio_net(dev);
1715         rmcd_debug(RDEV, "net_%d", net->id);
1716         kfree(net);
1717 }
1718
1719
1720 /*
1721  * rio_mport_add_riodev - creates a kernel RIO device object
1722  *
1723  * Allocates a RIO device data structure and initializes required fields based
1724  * on device's configuration space contents.
1725  * If the device has switch capabilities, then a switch specific portion is
1726  * allocated and configured.
1727  */
1728 static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
1729                                    void __user *arg)
1730 {
1731         struct mport_dev *md = priv->md;
1732         struct rio_rdev_info dev_info;
1733         struct rio_dev *rdev;
1734         struct rio_switch *rswitch = NULL;
1735         struct rio_mport *mport;
1736         size_t size;
1737         u32 rval;
1738         u32 swpinfo = 0;
1739         u16 destid;
1740         u8 hopcount;
1741         int err;
1742
1743         if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1744                 return -EFAULT;
1745
1746         rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1747                    dev_info.comptag, dev_info.destid, dev_info.hopcount);
1748
1749         if (bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name)) {
1750                 rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1751                 return -EEXIST;
1752         }
1753
1754         size = sizeof(*rdev);
1755         mport = md->mport;
1756         destid = dev_info.destid;
1757         hopcount = dev_info.hopcount;
1758
1759         if (rio_mport_read_config_32(mport, destid, hopcount,
1760                                      RIO_PEF_CAR, &rval))
1761                 return -EIO;
1762
1763         if (rval & RIO_PEF_SWITCH) {
1764                 rio_mport_read_config_32(mport, destid, hopcount,
1765                                          RIO_SWP_INFO_CAR, &swpinfo);
1766                 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
1767                          sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
1768         }
1769
1770         rdev = kzalloc(size, GFP_KERNEL);
1771         if (rdev == NULL)
1772                 return -ENOMEM;
1773
1774         if (mport->net == NULL) {
1775                 struct rio_net *net;
1776
1777                 net = rio_alloc_net(mport);
1778                 if (!net) {
1779                         err = -ENOMEM;
1780                         rmcd_debug(RDEV, "failed to allocate net object");
1781                         goto cleanup;
1782                 }
1783
1784                 net->id = mport->id;
1785                 net->hport = mport;
1786                 dev_set_name(&net->dev, "rnet_%d", net->id);
1787                 net->dev.parent = &mport->dev;
1788                 net->dev.release = rio_release_net;
1789                 err = rio_add_net(net);
1790                 if (err) {
1791                         rmcd_debug(RDEV, "failed to register net, err=%d", err);
1792                         kfree(net);
1793                         goto cleanup;
1794                 }
1795         }
1796
1797         rdev->net = mport->net;
1798         rdev->pef = rval;
1799         rdev->swpinfo = swpinfo;
1800         rio_mport_read_config_32(mport, destid, hopcount,
1801                                  RIO_DEV_ID_CAR, &rval);
1802         rdev->did = rval >> 16;
1803         rdev->vid = rval & 0xffff;
1804         rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1805                                  &rdev->device_rev);
1806         rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1807                                  &rval);
1808         rdev->asm_did = rval >> 16;
1809         rdev->asm_vid = rval & 0xffff;
1810         rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1811                                  &rval);
1812         rdev->asm_rev = rval >> 16;
1813
1814         if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1815                 rdev->efptr = rval & 0xffff;
1816                 rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1817                                                 hopcount, &rdev->phys_rmap);
1818
1819                 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1820                                                 hopcount, RIO_EFB_ERR_MGMNT);
1821         }
1822
1823         rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1824                                  &rdev->src_ops);
1825         rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1826                                  &rdev->dst_ops);
1827
1828         rdev->comp_tag = dev_info.comptag;
1829         rdev->destid = destid;
1830         /* hopcount is stored as specified by a caller, regardles of EP or SW */
1831         rdev->hopcount = hopcount;
1832
1833         if (rdev->pef & RIO_PEF_SWITCH) {
1834                 rswitch = rdev->rswitch;
1835                 rswitch->route_table = NULL;
1836         }
1837
1838         if (strlen(dev_info.name))
1839                 dev_set_name(&rdev->dev, "%s", dev_info.name);
1840         else if (rdev->pef & RIO_PEF_SWITCH)
1841                 dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1842                              rdev->comp_tag & RIO_CTAG_UDEVID);
1843         else
1844                 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1845                              rdev->comp_tag & RIO_CTAG_UDEVID);
1846
1847         INIT_LIST_HEAD(&rdev->net_list);
1848         rdev->dev.parent = &mport->net->dev;
1849         rio_attach_device(rdev);
1850         rdev->dev.release = rio_release_dev;
1851
1852         if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1853                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1854                                    0, 0xffff);
1855         err = rio_add_device(rdev);
1856         if (err)
1857                 goto cleanup;
1858         rio_dev_get(rdev);
1859
1860         return 0;
1861 cleanup:
1862         kfree(rdev);
1863         return err;
1864 }
1865
1866 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1867 {
1868         struct rio_rdev_info dev_info;
1869         struct rio_dev *rdev = NULL;
1870         struct device  *dev;
1871         struct rio_mport *mport;
1872         struct rio_net *net;
1873
1874         if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1875                 return -EFAULT;
1876
1877         mport = priv->md->mport;
1878
1879         /* If device name is specified, removal by name has priority */
1880         if (strlen(dev_info.name)) {
1881                 dev = bus_find_device_by_name(&rio_bus_type, NULL,
1882                                               dev_info.name);
1883                 if (dev)
1884                         rdev = to_rio_dev(dev);
1885         } else {
1886                 do {
1887                         rdev = rio_get_comptag(dev_info.comptag, rdev);
1888                         if (rdev && rdev->dev.parent == &mport->net->dev &&
1889                             rdev->destid == dev_info.destid &&
1890                             rdev->hopcount == dev_info.hopcount)
1891                                 break;
1892                 } while (rdev);
1893         }
1894
1895         if (!rdev) {
1896                 rmcd_debug(RDEV,
1897                         "device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1898                         dev_info.name, dev_info.comptag, dev_info.destid,
1899                         dev_info.hopcount);
1900                 return -ENODEV;
1901         }
1902
1903         net = rdev->net;
1904         rio_dev_put(rdev);
1905         rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1906
1907         if (list_empty(&net->devices)) {
1908                 rio_free_net(net);
1909                 mport->net = NULL;
1910         }
1911
1912         return 0;
1913 }
1914
1915 /*
1916  * Mport cdev management
1917  */
1918
1919 /*
1920  * mport_cdev_open() - Open character device (mport)
1921  */
1922 static int mport_cdev_open(struct inode *inode, struct file *filp)
1923 {
1924         int ret;
1925         int minor = iminor(inode);
1926         struct mport_dev *chdev;
1927         struct mport_cdev_priv *priv;
1928
1929         /* Test for valid device */
1930         if (minor >= RIO_MAX_MPORTS) {
1931                 rmcd_error("Invalid minor device number");
1932                 return -EINVAL;
1933         }
1934
1935         chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1936
1937         rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1938
1939         if (atomic_read(&chdev->active) == 0)
1940                 return -ENODEV;
1941
1942         get_device(&chdev->dev);
1943
1944         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1945         if (!priv) {
1946                 put_device(&chdev->dev);
1947                 return -ENOMEM;
1948         }
1949
1950         priv->md = chdev;
1951
1952         mutex_lock(&chdev->file_mutex);
1953         list_add_tail(&priv->list, &chdev->file_list);
1954         mutex_unlock(&chdev->file_mutex);
1955
1956         INIT_LIST_HEAD(&priv->db_filters);
1957         INIT_LIST_HEAD(&priv->pw_filters);
1958         spin_lock_init(&priv->fifo_lock);
1959         init_waitqueue_head(&priv->event_rx_wait);
1960         ret = kfifo_alloc(&priv->event_fifo,
1961                           sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
1962                           GFP_KERNEL);
1963         if (ret < 0) {
1964                 dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
1965                 ret = -ENOMEM;
1966                 goto err_fifo;
1967         }
1968
1969 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1970         INIT_LIST_HEAD(&priv->async_list);
1971         INIT_LIST_HEAD(&priv->pend_list);
1972         spin_lock_init(&priv->req_lock);
1973         mutex_init(&priv->dma_lock);
1974 #endif
1975
1976         filp->private_data = priv;
1977         goto out;
1978 err_fifo:
1979         kfree(priv);
1980 out:
1981         return ret;
1982 }
1983
1984 static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1985 {
1986         struct mport_cdev_priv *priv = filp->private_data;
1987
1988         return fasync_helper(fd, filp, mode, &priv->async_queue);
1989 }
1990
1991 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1992 static void mport_cdev_release_dma(struct file *filp)
1993 {
1994         struct mport_cdev_priv *priv = filp->private_data;
1995         struct mport_dev *md;
1996         struct mport_dma_req *req, *req_next;
1997         unsigned long tmo = msecs_to_jiffies(dma_timeout);
1998         long wret;
1999         LIST_HEAD(list);
2000
2001         rmcd_debug(EXIT, "from filp=%p %s(%d)",
2002                    filp, current->comm, task_pid_nr(current));
2003
2004         if (!priv->dmach) {
2005                 rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
2006                 return;
2007         }
2008
2009         md = priv->md;
2010
2011         flush_workqueue(dma_wq);
2012
2013         spin_lock(&priv->req_lock);
2014         if (!list_empty(&priv->async_list)) {
2015                 rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
2016                            filp, current->comm, task_pid_nr(current));
2017                 list_splice_init(&priv->async_list, &list);
2018         }
2019         spin_unlock(&priv->req_lock);
2020
2021         if (!list_empty(&list)) {
2022                 rmcd_debug(EXIT, "temp list not empty");
2023                 list_for_each_entry_safe(req, req_next, &list, node) {
2024                         rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
2025                                    req->filp, req->cookie,
2026                                    completion_done(&req->req_comp)?"yes":"no");
2027                         list_del(&req->node);
2028                         dma_req_free(req);
2029                 }
2030         }
2031
2032         if (!list_empty(&priv->pend_list)) {
2033                 rmcd_debug(EXIT, "Free pending DMA requests for filp=%p %s(%d)",
2034                            filp, current->comm, task_pid_nr(current));
2035                 list_for_each_entry_safe(req,
2036                                          req_next, &priv->pend_list, node) {
2037                         rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
2038                                    req->filp, req->cookie,
2039                                    completion_done(&req->req_comp)?"yes":"no");
2040                         list_del(&req->node);
2041                         dma_req_free(req);
2042                 }
2043         }
2044
2045         put_dma_channel(priv);
2046         wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
2047
2048         if (wret <= 0) {
2049                 rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
2050                         current->comm, task_pid_nr(current), wret);
2051         }
2052
2053         spin_lock(&priv->req_lock);
2054
2055         if (!list_empty(&priv->pend_list)) {
2056                 rmcd_debug(EXIT, "ATTN: pending DMA requests, filp=%p %s(%d)",
2057                            filp, current->comm, task_pid_nr(current));
2058         }
2059
2060         spin_unlock(&priv->req_lock);
2061
2062         if (priv->dmach != priv->md->dma_chan) {
2063                 rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
2064                            filp, current->comm, task_pid_nr(current));
2065                 rio_release_dma(priv->dmach);
2066         } else {
2067                 rmcd_debug(EXIT, "Adjust default DMA channel refcount");
2068                 kref_put(&md->dma_ref, mport_release_def_dma);
2069         }
2070
2071         priv->dmach = NULL;
2072 }
2073 #else
2074 #define mport_cdev_release_dma(priv) do {} while (0)
2075 #endif
2076
2077 /*
2078  * mport_cdev_release() - Release character device
2079  */
2080 static int mport_cdev_release(struct inode *inode, struct file *filp)
2081 {
2082         struct mport_cdev_priv *priv = filp->private_data;
2083         struct mport_dev *chdev;
2084         struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
2085         struct rio_mport_db_filter *db_filter, *db_filter_next;
2086         struct rio_mport_mapping *map, *_map;
2087         unsigned long flags;
2088
2089         rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2090
2091         chdev = priv->md;
2092         mport_cdev_release_dma(filp);
2093
2094         priv->event_mask = 0;
2095
2096         spin_lock_irqsave(&chdev->pw_lock, flags);
2097         if (!list_empty(&priv->pw_filters)) {
2098                 list_for_each_entry_safe(pw_filter, pw_filter_next,
2099                                          &priv->pw_filters, priv_node)
2100                         rio_mport_delete_pw_filter(pw_filter);
2101         }
2102         spin_unlock_irqrestore(&chdev->pw_lock, flags);
2103
2104         spin_lock_irqsave(&chdev->db_lock, flags);
2105         list_for_each_entry_safe(db_filter, db_filter_next,
2106                                  &priv->db_filters, priv_node) {
2107                 rio_mport_delete_db_filter(db_filter);
2108         }
2109         spin_unlock_irqrestore(&chdev->db_lock, flags);
2110
2111         kfifo_free(&priv->event_fifo);
2112
2113         mutex_lock(&chdev->buf_mutex);
2114         list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
2115                 if (map->filp == filp) {
2116                         rmcd_debug(EXIT, "release mapping %p filp=%p",
2117                                    map->virt_addr, filp);
2118                         kref_put(&map->ref, mport_release_mapping);
2119                 }
2120         }
2121         mutex_unlock(&chdev->buf_mutex);
2122
2123         mport_cdev_fasync(-1, filp, 0);
2124         filp->private_data = NULL;
2125         mutex_lock(&chdev->file_mutex);
2126         list_del(&priv->list);
2127         mutex_unlock(&chdev->file_mutex);
2128         put_device(&chdev->dev);
2129         kfree(priv);
2130         return 0;
2131 }
2132
2133 /*
2134  * mport_cdev_ioctl() - IOCTLs for character device
2135  */
2136 static long mport_cdev_ioctl(struct file *filp,
2137                 unsigned int cmd, unsigned long arg)
2138 {
2139         int err = -EINVAL;
2140         struct mport_cdev_priv *data = filp->private_data;
2141         struct mport_dev *md = data->md;
2142
2143         if (atomic_read(&md->active) == 0)
2144                 return -ENODEV;
2145
2146         switch (cmd) {
2147         case RIO_MPORT_MAINT_READ_LOCAL:
2148                 return rio_mport_maint_rd(data, (void __user *)arg, 1);
2149         case RIO_MPORT_MAINT_WRITE_LOCAL:
2150                 return rio_mport_maint_wr(data, (void __user *)arg, 1);
2151         case RIO_MPORT_MAINT_READ_REMOTE:
2152                 return rio_mport_maint_rd(data, (void __user *)arg, 0);
2153         case RIO_MPORT_MAINT_WRITE_REMOTE:
2154                 return rio_mport_maint_wr(data, (void __user *)arg, 0);
2155         case RIO_MPORT_MAINT_HDID_SET:
2156                 return maint_hdid_set(data, (void __user *)arg);
2157         case RIO_MPORT_MAINT_COMPTAG_SET:
2158                 return maint_comptag_set(data, (void __user *)arg);
2159         case RIO_MPORT_MAINT_PORT_IDX_GET:
2160                 return maint_port_idx_get(data, (void __user *)arg);
2161         case RIO_MPORT_GET_PROPERTIES:
2162                 md->properties.hdid = md->mport->host_deviceid;
2163                 if (copy_to_user((void __user *)arg, &(md->properties),
2164                                  sizeof(md->properties)))
2165                         return -EFAULT;
2166                 return 0;
2167         case RIO_ENABLE_DOORBELL_RANGE:
2168                 return rio_mport_add_db_filter(data, (void __user *)arg);
2169         case RIO_DISABLE_DOORBELL_RANGE:
2170                 return rio_mport_remove_db_filter(data, (void __user *)arg);
2171         case RIO_ENABLE_PORTWRITE_RANGE:
2172                 return rio_mport_add_pw_filter(data, (void __user *)arg);
2173         case RIO_DISABLE_PORTWRITE_RANGE:
2174                 return rio_mport_remove_pw_filter(data, (void __user *)arg);
2175         case RIO_SET_EVENT_MASK:
2176                 data->event_mask = (u32)arg;
2177                 return 0;
2178         case RIO_GET_EVENT_MASK:
2179                 if (copy_to_user((void __user *)arg, &data->event_mask,
2180                                     sizeof(u32)))
2181                         return -EFAULT;
2182                 return 0;
2183         case RIO_MAP_OUTBOUND:
2184                 return rio_mport_obw_map(filp, (void __user *)arg);
2185         case RIO_MAP_INBOUND:
2186                 return rio_mport_map_inbound(filp, (void __user *)arg);
2187         case RIO_UNMAP_OUTBOUND:
2188                 return rio_mport_obw_free(filp, (void __user *)arg);
2189         case RIO_UNMAP_INBOUND:
2190                 return rio_mport_inbound_free(filp, (void __user *)arg);
2191         case RIO_ALLOC_DMA:
2192                 return rio_mport_alloc_dma(filp, (void __user *)arg);
2193         case RIO_FREE_DMA:
2194                 return rio_mport_free_dma(filp, (void __user *)arg);
2195         case RIO_WAIT_FOR_ASYNC:
2196                 return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
2197         case RIO_TRANSFER:
2198                 return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2199         case RIO_DEV_ADD:
2200                 return rio_mport_add_riodev(data, (void __user *)arg);
2201         case RIO_DEV_DEL:
2202                 return rio_mport_del_riodev(data, (void __user *)arg);
2203         default:
2204                 break;
2205         }
2206
2207         return err;
2208 }
2209
2210 /*
2211  * mport_release_mapping - free mapping resources and info structure
2212  * @ref: a pointer to the kref within struct rio_mport_mapping
2213  *
2214  * NOTE: Shall be called while holding buf_mutex.
2215  */
2216 static void mport_release_mapping(struct kref *ref)
2217 {
2218         struct rio_mport_mapping *map =
2219                         container_of(ref, struct rio_mport_mapping, ref);
2220         struct rio_mport *mport = map->md->mport;
2221
2222         rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2223                    map->dir, map->virt_addr,
2224                    &map->phys_addr, mport->name);
2225
2226         list_del(&map->node);
2227
2228         switch (map->dir) {
2229         case MAP_INBOUND:
2230                 rio_unmap_inb_region(mport, map->phys_addr);
2231         case MAP_DMA:
2232                 dma_free_coherent(mport->dev.parent, map->size,
2233                                   map->virt_addr, map->phys_addr);
2234                 break;
2235         case MAP_OUTBOUND:
2236                 rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2237                 break;
2238         }
2239         kfree(map);
2240 }
2241
2242 static void mport_mm_open(struct vm_area_struct *vma)
2243 {
2244         struct rio_mport_mapping *map = vma->vm_private_data;
2245
2246         rmcd_debug(MMAP, "%pad", &map->phys_addr);
2247         kref_get(&map->ref);
2248 }
2249
2250 static void mport_mm_close(struct vm_area_struct *vma)
2251 {
2252         struct rio_mport_mapping *map = vma->vm_private_data;
2253
2254         rmcd_debug(MMAP, "%pad", &map->phys_addr);
2255         mutex_lock(&map->md->buf_mutex);
2256         kref_put(&map->ref, mport_release_mapping);
2257         mutex_unlock(&map->md->buf_mutex);
2258 }
2259
2260 static const struct vm_operations_struct vm_ops = {
2261         .open = mport_mm_open,
2262         .close = mport_mm_close,
2263 };
2264
2265 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2266 {
2267         struct mport_cdev_priv *priv = filp->private_data;
2268         struct mport_dev *md;
2269         size_t size = vma->vm_end - vma->vm_start;
2270         dma_addr_t baddr;
2271         unsigned long offset;
2272         int found = 0, ret;
2273         struct rio_mport_mapping *map;
2274
2275         rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2276                    (unsigned int)size, vma->vm_pgoff);
2277
2278         md = priv->md;
2279         baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
2280
2281         mutex_lock(&md->buf_mutex);
2282         list_for_each_entry(map, &md->mappings, node) {
2283                 if (baddr >= map->phys_addr &&
2284                     baddr < (map->phys_addr + map->size)) {
2285                         found = 1;
2286                         break;
2287                 }
2288         }
2289         mutex_unlock(&md->buf_mutex);
2290
2291         if (!found)
2292                 return -ENOMEM;
2293
2294         offset = baddr - map->phys_addr;
2295
2296         if (size + offset > map->size)
2297                 return -EINVAL;
2298
2299         vma->vm_pgoff = offset >> PAGE_SHIFT;
2300         rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
2301
2302         if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
2303                 ret = dma_mmap_coherent(md->mport->dev.parent, vma,
2304                                 map->virt_addr, map->phys_addr, map->size);
2305         else if (map->dir == MAP_OUTBOUND) {
2306                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
2307                 ret = vm_iomap_memory(vma, map->phys_addr, map->size);
2308         } else {
2309                 rmcd_error("Attempt to mmap unsupported mapping type");
2310                 ret = -EIO;
2311         }
2312
2313         if (!ret) {
2314                 vma->vm_private_data = map;
2315                 vma->vm_ops = &vm_ops;
2316                 mport_mm_open(vma);
2317         } else {
2318                 rmcd_error("MMAP exit with err=%d", ret);
2319         }
2320
2321         return ret;
2322 }
2323
2324 static unsigned int mport_cdev_poll(struct file *filp, poll_table *wait)
2325 {
2326         struct mport_cdev_priv *priv = filp->private_data;
2327
2328         poll_wait(filp, &priv->event_rx_wait, wait);
2329         if (kfifo_len(&priv->event_fifo))
2330                 return POLLIN | POLLRDNORM;
2331
2332         return 0;
2333 }
2334
2335 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2336                         loff_t *ppos)
2337 {
2338         struct mport_cdev_priv *priv = filp->private_data;
2339         int copied;
2340         ssize_t ret;
2341
2342         if (!count)
2343                 return 0;
2344
2345         if (kfifo_is_empty(&priv->event_fifo) &&
2346             (filp->f_flags & O_NONBLOCK))
2347                 return -EAGAIN;
2348
2349         if (count % sizeof(struct rio_event))
2350                 return -EINVAL;
2351
2352         ret = wait_event_interruptible(priv->event_rx_wait,
2353                                         kfifo_len(&priv->event_fifo) != 0);
2354         if (ret)
2355                 return ret;
2356
2357         while (ret < count) {
2358                 if (kfifo_to_user(&priv->event_fifo, buf,
2359                       sizeof(struct rio_event), &copied))
2360                         return -EFAULT;
2361                 ret += copied;
2362                 buf += copied;
2363         }
2364
2365         return ret;
2366 }
2367
2368 static ssize_t mport_write(struct file *filp, const char __user *buf,
2369                          size_t count, loff_t *ppos)
2370 {
2371         struct mport_cdev_priv *priv = filp->private_data;
2372         struct rio_mport *mport = priv->md->mport;
2373         struct rio_event event;
2374         int len, ret;
2375
2376         if (!count)
2377                 return 0;
2378
2379         if (count % sizeof(event))
2380                 return -EINVAL;
2381
2382         len = 0;
2383         while ((count - len) >= (int)sizeof(event)) {
2384                 if (copy_from_user(&event, buf, sizeof(event)))
2385                         return -EFAULT;
2386
2387                 if (event.header != RIO_DOORBELL)
2388                         return -EINVAL;
2389
2390                 ret = rio_mport_send_doorbell(mport,
2391                                               event.u.doorbell.rioid,
2392                                               event.u.doorbell.payload);
2393                 if (ret < 0)
2394                         return ret;
2395
2396                 len += sizeof(event);
2397                 buf += sizeof(event);
2398         }
2399
2400         return len;
2401 }
2402
2403 static const struct file_operations mport_fops = {
2404         .owner          = THIS_MODULE,
2405         .open           = mport_cdev_open,
2406         .release        = mport_cdev_release,
2407         .poll           = mport_cdev_poll,
2408         .read           = mport_read,
2409         .write          = mport_write,
2410         .mmap           = mport_cdev_mmap,
2411         .fasync         = mport_cdev_fasync,
2412         .unlocked_ioctl = mport_cdev_ioctl
2413 };
2414
2415 /*
2416  * Character device management
2417  */
2418
2419 static void mport_device_release(struct device *dev)
2420 {
2421         struct mport_dev *md;
2422
2423         rmcd_debug(EXIT, "%s", dev_name(dev));
2424         md = container_of(dev, struct mport_dev, dev);
2425         kfree(md);
2426 }
2427
2428 /*
2429  * mport_cdev_add() - Create mport_dev from rio_mport
2430  * @mport:      RapidIO master port
2431  */
2432 static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2433 {
2434         int ret = 0;
2435         struct mport_dev *md;
2436         struct rio_mport_attr attr;
2437
2438         md = kzalloc(sizeof(*md), GFP_KERNEL);
2439         if (!md) {
2440                 rmcd_error("Unable allocate a device object");
2441                 return NULL;
2442         }
2443
2444         md->mport = mport;
2445         mutex_init(&md->buf_mutex);
2446         mutex_init(&md->file_mutex);
2447         INIT_LIST_HEAD(&md->file_list);
2448         cdev_init(&md->cdev, &mport_fops);
2449         md->cdev.owner = THIS_MODULE;
2450         ret = cdev_add(&md->cdev, MKDEV(MAJOR(dev_number), mport->id), 1);
2451         if (ret < 0) {
2452                 kfree(md);
2453                 rmcd_error("Unable to register a device, err=%d", ret);
2454                 return NULL;
2455         }
2456
2457         md->dev.devt = md->cdev.dev;
2458         md->dev.class = dev_class;
2459         md->dev.parent = &mport->dev;
2460         md->dev.release = mport_device_release;
2461         dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
2462         atomic_set(&md->active, 1);
2463
2464         ret = device_register(&md->dev);
2465         if (ret) {
2466                 rmcd_error("Failed to register mport %d (err=%d)",
2467                        mport->id, ret);
2468                 goto err_cdev;
2469         }
2470
2471         get_device(&md->dev);
2472
2473         INIT_LIST_HEAD(&md->doorbells);
2474         spin_lock_init(&md->db_lock);
2475         INIT_LIST_HEAD(&md->portwrites);
2476         spin_lock_init(&md->pw_lock);
2477         INIT_LIST_HEAD(&md->mappings);
2478
2479         md->properties.id = mport->id;
2480         md->properties.sys_size = mport->sys_size;
2481         md->properties.hdid = mport->host_deviceid;
2482         md->properties.index = mport->index;
2483
2484         /* The transfer_mode property will be returned through mport query
2485          * interface
2486          */
2487 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2488         md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2489 #else
2490         md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2491 #endif
2492         ret = rio_query_mport(mport, &attr);
2493         if (!ret) {
2494                 md->properties.flags = attr.flags;
2495                 md->properties.link_speed = attr.link_speed;
2496                 md->properties.link_width = attr.link_width;
2497                 md->properties.dma_max_sge = attr.dma_max_sge;
2498                 md->properties.dma_max_size = attr.dma_max_size;
2499                 md->properties.dma_align = attr.dma_align;
2500                 md->properties.cap_sys_size = 0;
2501                 md->properties.cap_transfer_mode = 0;
2502                 md->properties.cap_addr_size = 0;
2503         } else
2504                 pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2505                         mport->name, MAJOR(dev_number), mport->id);
2506
2507         mutex_lock(&mport_devs_lock);
2508         list_add_tail(&md->node, &mport_devs);
2509         mutex_unlock(&mport_devs_lock);
2510
2511         pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2512                 mport->name, MAJOR(dev_number), mport->id);
2513
2514         return md;
2515
2516 err_cdev:
2517         cdev_del(&md->cdev);
2518         kfree(md);
2519         return NULL;
2520 }
2521
2522 /*
2523  * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2524  *                              associated DMA channels.
2525  */
2526 static void mport_cdev_terminate_dma(struct mport_dev *md)
2527 {
2528 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2529         struct mport_cdev_priv *client;
2530
2531         rmcd_debug(DMA, "%s", dev_name(&md->dev));
2532
2533         mutex_lock(&md->file_mutex);
2534         list_for_each_entry(client, &md->file_list, list) {
2535                 if (client->dmach) {
2536                         dmaengine_terminate_all(client->dmach);
2537                         rio_release_dma(client->dmach);
2538                 }
2539         }
2540         mutex_unlock(&md->file_mutex);
2541
2542         if (md->dma_chan) {
2543                 dmaengine_terminate_all(md->dma_chan);
2544                 rio_release_dma(md->dma_chan);
2545                 md->dma_chan = NULL;
2546         }
2547 #endif
2548 }
2549
2550
2551 /*
2552  * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2553  *                            mport_cdev files.
2554  */
2555 static int mport_cdev_kill_fasync(struct mport_dev *md)
2556 {
2557         unsigned int files = 0;
2558         struct mport_cdev_priv *client;
2559
2560         mutex_lock(&md->file_mutex);
2561         list_for_each_entry(client, &md->file_list, list) {
2562                 if (client->async_queue)
2563                         kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
2564                 files++;
2565         }
2566         mutex_unlock(&md->file_mutex);
2567         return files;
2568 }
2569
2570 /*
2571  * mport_cdev_remove() - Remove mport character device
2572  * @dev:        Mport device to remove
2573  */
2574 static void mport_cdev_remove(struct mport_dev *md)
2575 {
2576         struct rio_mport_mapping *map, *_map;
2577
2578         rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
2579         atomic_set(&md->active, 0);
2580         mport_cdev_terminate_dma(md);
2581         rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2582         cdev_del(&(md->cdev));
2583         mport_cdev_kill_fasync(md);
2584
2585         flush_workqueue(dma_wq);
2586
2587         /* TODO: do we need to give clients some time to close file
2588          * descriptors? Simple wait for XX, or kref?
2589          */
2590
2591         /*
2592          * Release DMA buffers allocated for the mport device.
2593          * Disable associated inbound Rapidio requests mapping if applicable.
2594          */
2595         mutex_lock(&md->buf_mutex);
2596         list_for_each_entry_safe(map, _map, &md->mappings, node) {
2597                 kref_put(&map->ref, mport_release_mapping);
2598         }
2599         mutex_unlock(&md->buf_mutex);
2600
2601         if (!list_empty(&md->mappings))
2602                 rmcd_warn("WARNING: %s pending mappings on removal",
2603                           md->mport->name);
2604
2605         rio_release_inb_dbell(md->mport, 0, 0x0fff);
2606
2607         device_unregister(&md->dev);
2608         put_device(&md->dev);
2609 }
2610
2611 /*
2612  * RIO rio_mport_interface driver
2613  */
2614
2615 /*
2616  * mport_add_mport() - Add rio_mport from LDM device struct
2617  * @dev:                Linux device model struct
2618  * @class_intf: Linux class_interface
2619  */
2620 static int mport_add_mport(struct device *dev,
2621                 struct class_interface *class_intf)
2622 {
2623         struct rio_mport *mport = NULL;
2624         struct mport_dev *chdev = NULL;
2625
2626         mport = to_rio_mport(dev);
2627         if (!mport)
2628                 return -ENODEV;
2629
2630         chdev = mport_cdev_add(mport);
2631         if (!chdev)
2632                 return -ENODEV;
2633
2634         return 0;
2635 }
2636
2637 /*
2638  * mport_remove_mport() - Remove rio_mport from global list
2639  * TODO remove device from global mport_dev list
2640  */
2641 static void mport_remove_mport(struct device *dev,
2642                 struct class_interface *class_intf)
2643 {
2644         struct rio_mport *mport = NULL;
2645         struct mport_dev *chdev;
2646         int found = 0;
2647
2648         mport = to_rio_mport(dev);
2649         rmcd_debug(EXIT, "Remove %s", mport->name);
2650
2651         mutex_lock(&mport_devs_lock);
2652         list_for_each_entry(chdev, &mport_devs, node) {
2653                 if (chdev->mport->id == mport->id) {
2654                         atomic_set(&chdev->active, 0);
2655                         list_del(&chdev->node);
2656                         found = 1;
2657                         break;
2658                 }
2659         }
2660         mutex_unlock(&mport_devs_lock);
2661
2662         if (found)
2663                 mport_cdev_remove(chdev);
2664 }
2665
2666 /* the rio_mport_interface is used to handle local mport devices */
2667 static struct class_interface rio_mport_interface __refdata = {
2668         .class          = &rio_mport_class,
2669         .add_dev        = mport_add_mport,
2670         .remove_dev     = mport_remove_mport,
2671 };
2672
2673 /*
2674  * Linux kernel module
2675  */
2676
2677 /*
2678  * mport_init - Driver module loading
2679  */
2680 static int __init mport_init(void)
2681 {
2682         int ret;
2683
2684         /* Create device class needed by udev */
2685         dev_class = class_create(THIS_MODULE, DRV_NAME);
2686         if (IS_ERR(dev_class)) {
2687                 rmcd_error("Unable to create " DRV_NAME " class");
2688                 return PTR_ERR(dev_class);
2689         }
2690
2691         ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2692         if (ret < 0)
2693                 goto err_chr;
2694
2695         rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2696
2697         /* Register to rio_mport_interface */
2698         ret = class_interface_register(&rio_mport_interface);
2699         if (ret) {
2700                 rmcd_error("class_interface_register() failed, err=%d", ret);
2701                 goto err_cli;
2702         }
2703
2704         dma_wq = create_singlethread_workqueue("dma_wq");
2705         if (!dma_wq) {
2706                 rmcd_error("failed to create DMA work queue");
2707                 ret = -ENOMEM;
2708                 goto err_wq;
2709         }
2710
2711         return 0;
2712
2713 err_wq:
2714         class_interface_unregister(&rio_mport_interface);
2715 err_cli:
2716         unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2717 err_chr:
2718         class_destroy(dev_class);
2719         return ret;
2720 }
2721
2722 /**
2723  * mport_exit - Driver module unloading
2724  */
2725 static void __exit mport_exit(void)
2726 {
2727         class_interface_unregister(&rio_mport_interface);
2728         class_destroy(dev_class);
2729         unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2730         destroy_workqueue(dma_wq);
2731 }
2732
2733 module_init(mport_init);
2734 module_exit(mport_exit);