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 int offset;
 880                 long pinned;
 881
 882                 offset = lower_32_bits(offset_in_page(xfer->loc_addr));
 883                 nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
 884
 885                 page_list = kmalloc_array(nr_pages,
 886                                           sizeof(*page_list), GFP_KERNEL);
 887                 if (page_list == NULL) {
 888                         ret = -ENOMEM;
 889                         goto err_req;
 890                 }
 891
 892                 pinned = get_user_pages_fast(
 893                                 (unsigned long)xfer->loc_addr & PAGE_MASK,
 894                                 nr_pages, dir == DMA_FROM_DEVICE, page_list);
 895
 896                 if (pinned != nr_pages) {
 897                         if (pinned < 0) {
 898                                 rmcd_error("get_user_pages_unlocked err=%ld",
 899                                            pinned);
 900                                 nr_pages = 0;
 901                         } else
 902                                 rmcd_error("pinned %ld out of %ld pages",
 903                                            pinned, nr_pages);
 904                         ret = -EFAULT;
 905                         goto err_pg;
 906                 }
 907
 908                 ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
 909                                         offset, xfer->length, GFP_KERNEL);
 910                 if (ret) {
 911                         rmcd_error("sg_alloc_table failed with err=%d", ret);
 912                         goto err_pg;
 913                 }
 914
 915                 req->page_list = page_list;
 916                 req->nr_pages = nr_pages;
 917         } else {
 918                 dma_addr_t baddr;
 919                 struct rio_mport_mapping *map;
 920
 921                 baddr = (dma_addr_t)xfer->handle;
 922
 923                 mutex_lock(&md->buf_mutex);
 924                 list_for_each_entry(map, &md->mappings, node) {
 925                         if (baddr >= map->phys_addr &&
 926                             baddr < (map->phys_addr + map->size)) {
 927                                 kref_get(&map->ref);
 928                                 req->map = map;
 929                                 break;
 930                         }
 931                 }
 932                 mutex_unlock(&md->buf_mutex);
 933
 934                 if (req->map == NULL) {
 935                         ret = -ENOMEM;
 936                         goto err_req;
 937                 }
 938
 939                 if (xfer->length + xfer->offset > map->size) {
 940                         ret = -EINVAL;
 941                         goto err_req;
 942                 }
 943
 944                 ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
 945                 if (unlikely(ret)) {
 946                         rmcd_error("sg_alloc_table failed for internal buf");
 947                         goto err_req;
 948                 }
 949
 950                 sg_set_buf(req->sgt.sgl,
 951                            map->virt_addr + (baddr - map->phys_addr) +
 952                                 xfer->offset, xfer->length);
 953         }
 954
 955         req->dir = dir;
 956         req->filp = filp;
 957         req->priv = priv;
 958         chan = priv->dmach;
 959
 960         nents = dma_map_sg(chan->device->dev,
 961                            req->sgt.sgl, req->sgt.nents, dir);
 962         if (nents == 0) {
 963                 rmcd_error("Failed to map SG list");
 964                 ret = -EFAULT;
 965                 goto err_pg;
 966         }
 967
 968         ret = do_dma_request(req, xfer, sync, nents);
 969
 970         if (ret >= 0) {
 971                 if (sync == RIO_TRANSFER_SYNC)
 972                         goto sync_out;
 973                 return ret; /* return ASYNC cookie */
 974         }
 975
 976         if (ret == -ETIMEDOUT || ret == -EINTR) {
 977                 /*
 978                  * This can happen only in case of SYNC transfer.
 979                  * Do not free unfinished request structure immediately.
 980                  * Place it into pending list and deal with it later
 981                  */
 982                 spin_lock(&priv->req_lock);
 983                 list_add_tail(&req->node, &priv->pend_list);
 984                 spin_unlock(&priv->req_lock);
 985                 return ret;
 986         }
 987
 988
 989         rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
 990 sync_out:
 991         dma_unmap_sg(chan->device->dev, req->sgt.sgl, req->sgt.nents, dir);
 992         sg_free_table(&req->sgt);
 993 err_pg:
 994         if (page_list) {
 995                 for (i = 0; i < nr_pages; i++)
 996                         put_page(page_list[i]);
 997                 kfree(page_list);
 998         }
 999 err_req:
1000         if (req->map) {
1001                 mutex_lock(&md->buf_mutex);
1002                 kref_put(&req->map->ref, mport_release_mapping);
1003                 mutex_unlock(&md->buf_mutex);
1004         }
1005         put_dma_channel(priv);
1006         kfree(req);
1007         return ret;
1008 }
1009
1010 static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
1011 {
1012         struct mport_cdev_priv *priv = filp->private_data;
1013         struct rio_transaction transaction;
1014         struct rio_transfer_io *transfer;
1015         enum dma_data_direction dir;
1016         int i, ret = 0;
1017
1018         if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
1019                 return -EFAULT;
1020
1021         if (transaction.count != 1) /* only single transfer for now */
1022                 return -EINVAL;
1023
1024         if ((transaction.transfer_mode &
1025              priv->md->properties.transfer_mode) == 0)
1026                 return -ENODEV;
1027
1028         transfer = vmalloc(transaction.count * sizeof(*transfer));
1029         if (!transfer)
1030                 return -ENOMEM;
1031
1032         if (unlikely(copy_from_user(transfer,
1033                                     (void __user *)(uintptr_t)transaction.block,
1034                                     transaction.count * sizeof(*transfer)))) {
1035                 ret = -EFAULT;
1036                 goto out_free;
1037         }
1038
1039         dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
1040                                         DMA_FROM_DEVICE : DMA_TO_DEVICE;
1041         for (i = 0; i < transaction.count && ret == 0; i++)
1042                 ret = rio_dma_transfer(filp, transaction.transfer_mode,
1043                         transaction.sync, dir, &transfer[i]);
1044
1045         if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
1046                                   transfer,
1047                                   transaction.count * sizeof(*transfer))))
1048                 ret = -EFAULT;
1049
1050 out_free:
1051         vfree(transfer);
1052
1053         return ret;
1054 }
1055
1056 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1057 {
1058         struct mport_cdev_priv *priv;
1059         struct mport_dev *md;
1060         struct rio_async_tx_wait w_param;
1061         struct mport_dma_req *req;
1062         dma_cookie_t cookie;
1063         unsigned long tmo;
1064         long wret;
1065         int found = 0;
1066         int ret;
1067
1068         priv = (struct mport_cdev_priv *)filp->private_data;
1069         md = priv->md;
1070
1071         if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
1072                 return -EFAULT;
1073
1074         cookie = w_param.token;
1075         if (w_param.timeout)
1076                 tmo = msecs_to_jiffies(w_param.timeout);
1077         else /* Use default DMA timeout */
1078                 tmo = msecs_to_jiffies(dma_timeout);
1079
1080         spin_lock(&priv->req_lock);
1081         list_for_each_entry(req, &priv->async_list, node) {
1082                 if (req->cookie == cookie) {
1083                         list_del(&req->node);
1084                         found = 1;
1085                         break;
1086                 }
1087         }
1088         spin_unlock(&priv->req_lock);
1089
1090         if (!found)
1091                 return -EAGAIN;
1092
1093         wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
1094
1095         if (wret == 0) {
1096                 /* Timeout on wait occurred */
1097                 rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1098                        current->comm, task_pid_nr(current),
1099                        (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1100                 ret = -ETIMEDOUT;
1101                 goto err_tmo;
1102         } else if (wret == -ERESTARTSYS) {
1103                 /* Wait_for_completion was interrupted by a signal but DMA may
1104                  * be still in progress
1105                  */
1106                 rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1107                         current->comm, task_pid_nr(current),
1108                         (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1109                 ret = -EINTR;
1110                 goto err_tmo;
1111         }
1112
1113         if (req->status != DMA_COMPLETE) {
1114                 /* DMA transaction completion signaled with transfer error */
1115                 rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1116                         current->comm, task_pid_nr(current),
1117                         (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
1118                         req->status);
1119                 ret = -EIO;
1120         } else
1121                 ret = 0;
1122
1123         if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1124                 dma_req_free(req);
1125
1126         return ret;
1127
1128 err_tmo:
1129         /* Return request back into async queue */
1130         spin_lock(&priv->req_lock);
1131         list_add_tail(&req->node, &priv->async_list);
1132         spin_unlock(&priv->req_lock);
1133         return ret;
1134 }
1135
1136 static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1137                         u64 size, struct rio_mport_mapping **mapping)
1138 {
1139         struct rio_mport_mapping *map;
1140
1141         map = kzalloc(sizeof(*map), GFP_KERNEL);
1142         if (map == NULL)
1143                 return -ENOMEM;
1144
1145         map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1146                                             &map->phys_addr, GFP_KERNEL);
1147         if (map->virt_addr == NULL) {
1148                 kfree(map);
1149                 return -ENOMEM;
1150         }
1151
1152         map->dir = MAP_DMA;
1153         map->size = size;
1154         map->filp = filp;
1155         map->md = md;
1156         kref_init(&map->ref);
1157         mutex_lock(&md->buf_mutex);
1158         list_add_tail(&map->node, &md->mappings);
1159         mutex_unlock(&md->buf_mutex);
1160         *mapping = map;
1161
1162         return 0;
1163 }
1164
1165 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1166 {
1167         struct mport_cdev_priv *priv = filp->private_data;
1168         struct mport_dev *md = priv->md;
1169         struct rio_dma_mem map;
1170         struct rio_mport_mapping *mapping = NULL;
1171         int ret;
1172
1173         if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1174                 return -EFAULT;
1175
1176         ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1177         if (ret)
1178                 return ret;
1179
1180         map.dma_handle = mapping->phys_addr;
1181
1182         if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1183                 mutex_lock(&md->buf_mutex);
1184                 kref_put(&mapping->ref, mport_release_mapping);
1185                 mutex_unlock(&md->buf_mutex);
1186                 return -EFAULT;
1187         }
1188
1189         return 0;
1190 }
1191
1192 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1193 {
1194         struct mport_cdev_priv *priv = filp->private_data;
1195         struct mport_dev *md = priv->md;
1196         u64 handle;
1197         int ret = -EFAULT;
1198         struct rio_mport_mapping *map, *_map;
1199
1200         if (copy_from_user(&handle, arg, sizeof(handle)))
1201                 return -EFAULT;
1202         rmcd_debug(EXIT, "filp=%p", filp);
1203
1204         mutex_lock(&md->buf_mutex);
1205         list_for_each_entry_safe(map, _map, &md->mappings, node) {
1206                 if (map->dir == MAP_DMA && map->phys_addr == handle &&
1207                     map->filp == filp) {
1208                         kref_put(&map->ref, mport_release_mapping);
1209                         ret = 0;
1210                         break;
1211                 }
1212         }
1213         mutex_unlock(&md->buf_mutex);
1214
1215         if (ret == -EFAULT) {
1216                 rmcd_debug(DMA, "ERR no matching mapping");
1217                 return ret;
1218         }
1219
1220         return 0;
1221 }
1222 #else
1223 static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1224 {
1225         return -ENODEV;
1226 }
1227
1228 static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1229 {
1230         return -ENODEV;
1231 }
1232
1233 static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1234 {
1235         return -ENODEV;
1236 }
1237
1238 static int rio_mport_free_dma(struct file *filp, void __user *arg)
1239 {
1240         return -ENODEV;
1241 }
1242 #endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1243
1244 /*
1245  * Inbound/outbound memory mapping functions
1246  */
1247
1248 static int
1249 rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1250                                 u64 raddr, u64 size,
1251                                 struct rio_mport_mapping **mapping)
1252 {
1253         struct rio_mport *mport = md->mport;
1254         struct rio_mport_mapping *map;
1255         int ret;
1256
1257         /* rio_map_inb_region() accepts u32 size */
1258         if (size > 0xffffffff)
1259                 return -EINVAL;
1260
1261         map = kzalloc(sizeof(*map), GFP_KERNEL);
1262         if (map == NULL)
1263                 return -ENOMEM;
1264
1265         map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1266                                             &map->phys_addr, GFP_KERNEL);
1267         if (map->virt_addr == NULL) {
1268                 ret = -ENOMEM;
1269                 goto err_dma_alloc;
1270         }
1271
1272         if (raddr == RIO_MAP_ANY_ADDR)
1273                 raddr = map->phys_addr;
1274         ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1275         if (ret < 0)
1276                 goto err_map_inb;
1277
1278         map->dir = MAP_INBOUND;
1279         map->rio_addr = raddr;
1280         map->size = size;
1281         map->filp = filp;
1282         map->md = md;
1283         kref_init(&map->ref);
1284         mutex_lock(&md->buf_mutex);
1285         list_add_tail(&map->node, &md->mappings);
1286         mutex_unlock(&md->buf_mutex);
1287         *mapping = map;
1288         return 0;
1289
1290 err_map_inb:
1291         dma_free_coherent(mport->dev.parent, size,
1292                           map->virt_addr, map->phys_addr);
1293 err_dma_alloc:
1294         kfree(map);
1295         return ret;
1296 }
1297
1298 static int
1299 rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1300                               u64 raddr, u64 size,
1301                               struct rio_mport_mapping **mapping)
1302 {
1303         struct rio_mport_mapping *map;
1304         int err = -ENOMEM;
1305
1306         if (raddr == RIO_MAP_ANY_ADDR)
1307                 goto get_new;
1308
1309         mutex_lock(&md->buf_mutex);
1310         list_for_each_entry(map, &md->mappings, node) {
1311                 if (map->dir != MAP_INBOUND)
1312                         continue;
1313                 if (raddr == map->rio_addr && size == map->size) {
1314                         /* allow exact match only */
1315                         *mapping = map;
1316                         err = 0;
1317                         break;
1318                 } else if (raddr < (map->rio_addr + map->size - 1) &&
1319                            (raddr + size) > map->rio_addr) {
1320                         err = -EBUSY;
1321                         break;
1322                 }
1323         }
1324         mutex_unlock(&md->buf_mutex);
1325
1326         if (err != -ENOMEM)
1327                 return err;
1328 get_new:
1329         /* not found, create new */
1330         return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1331 }
1332
1333 static int rio_mport_map_inbound(struct file *filp, void __user *arg)
1334 {
1335         struct mport_cdev_priv *priv = filp->private_data;
1336         struct mport_dev *md = priv->md;
1337         struct rio_mmap map;
1338         struct rio_mport_mapping *mapping = NULL;
1339         int ret;
1340
1341         if (!md->mport->ops->map_inb)
1342                 return -EPROTONOSUPPORT;
1343         if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1344                 return -EFAULT;
1345
1346         rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1347
1348         ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1349                                             map.length, &mapping);
1350         if (ret)
1351                 return ret;
1352
1353         map.handle = mapping->phys_addr;
1354         map.rio_addr = mapping->rio_addr;
1355
1356         if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1357                 /* Delete mapping if it was created by this request */
1358                 if (ret == 0 && mapping->filp == filp) {
1359                         mutex_lock(&md->buf_mutex);
1360                         kref_put(&mapping->ref, mport_release_mapping);
1361                         mutex_unlock(&md->buf_mutex);
1362                 }
1363                 return -EFAULT;
1364         }
1365
1366         return 0;
1367 }
1368
1369 /*
1370  * rio_mport_inbound_free() - unmap from RapidIO address space and free
1371  *                    previously allocated inbound DMA coherent buffer
1372  * @priv: driver private data
1373  * @arg:  buffer handle returned by allocation routine
1374  */
1375 static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1376 {
1377         struct mport_cdev_priv *priv = filp->private_data;
1378         struct mport_dev *md = priv->md;
1379         u64 handle;
1380         struct rio_mport_mapping *map, *_map;
1381
1382         rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1383
1384         if (!md->mport->ops->unmap_inb)
1385                 return -EPROTONOSUPPORT;
1386
1387         if (copy_from_user(&handle, arg, sizeof(handle)))
1388                 return -EFAULT;
1389
1390         mutex_lock(&md->buf_mutex);
1391         list_for_each_entry_safe(map, _map, &md->mappings, node) {
1392                 if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
1393                         if (map->filp == filp) {
1394                                 map->filp = NULL;
1395                                 kref_put(&map->ref, mport_release_mapping);
1396                         }
1397                         break;
1398                 }
1399         }
1400         mutex_unlock(&md->buf_mutex);
1401
1402         return 0;
1403 }
1404
1405 /*
1406  * maint_port_idx_get() - Get the port index of the mport instance
1407  * @priv: driver private data
1408  * @arg:  port index
1409  */
1410 static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1411 {
1412         struct mport_dev *md = priv->md;
1413         u32 port_idx = md->mport->index;
1414
1415         rmcd_debug(MPORT, "port_index=%d", port_idx);
1416
1417         if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1418                 return -EFAULT;
1419
1420         return 0;
1421 }
1422
1423 static int rio_mport_add_event(struct mport_cdev_priv *priv,
1424                                struct rio_event *event)
1425 {
1426         int overflow;
1427
1428         if (!(priv->event_mask & event->header))
1429                 return -EACCES;
1430
1431         spin_lock(&priv->fifo_lock);
1432         overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
1433                 || kfifo_in(&priv->event_fifo, (unsigned char *)event,
1434                         sizeof(*event)) != sizeof(*event);
1435         spin_unlock(&priv->fifo_lock);
1436
1437         wake_up_interruptible(&priv->event_rx_wait);
1438
1439         if (overflow) {
1440                 dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1441                 return -EBUSY;
1442         }
1443
1444         return 0;
1445 }
1446
1447 static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1448                                        u16 src, u16 dst, u16 info)
1449 {
1450         struct mport_dev *data = dev_id;
1451         struct mport_cdev_priv *priv;
1452         struct rio_mport_db_filter *db_filter;
1453         struct rio_event event;
1454         int handled;
1455
1456         event.header = RIO_DOORBELL;
1457         event.u.doorbell.rioid = src;
1458         event.u.doorbell.payload = info;
1459
1460         handled = 0;
1461         spin_lock(&data->db_lock);
1462         list_for_each_entry(db_filter, &data->doorbells, data_node) {
1463                 if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1464                       db_filter->filter.rioid == src)) &&
1465                       info >= db_filter->filter.low &&
1466                       info <= db_filter->filter.high) {
1467                         priv = db_filter->priv;
1468                         rio_mport_add_event(priv, &event);
1469                         handled = 1;
1470                 }
1471         }
1472         spin_unlock(&data->db_lock);
1473
1474         if (!handled)
1475                 dev_warn(&data->dev,
1476                         "%s: spurious DB received from 0x%x, info=0x%04x\n",
1477                         __func__, src, info);
1478 }
1479
1480 static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
1481                                    void __user *arg)
1482 {
1483         struct mport_dev *md = priv->md;
1484         struct rio_mport_db_filter *db_filter;
1485         struct rio_doorbell_filter filter;
1486         unsigned long flags;
1487         int ret;
1488
1489         if (copy_from_user(&filter, arg, sizeof(filter)))
1490                 return -EFAULT;
1491
1492         if (filter.low > filter.high)
1493                 return -EINVAL;
1494
1495         ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1496                                     rio_mport_doorbell_handler);
1497         if (ret) {
1498                 rmcd_error("%s failed to register IBDB, err=%d",
1499                            dev_name(&md->dev), ret);
1500                 return ret;
1501         }
1502
1503         db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
1504         if (db_filter == NULL) {
1505                 rio_release_inb_dbell(md->mport, filter.low, filter.high);
1506                 return -ENOMEM;
1507         }
1508
1509         db_filter->filter = filter;
1510         db_filter->priv = priv;
1511         spin_lock_irqsave(&md->db_lock, flags);
1512         list_add_tail(&db_filter->priv_node, &priv->db_filters);
1513         list_add_tail(&db_filter->data_node, &md->doorbells);
1514         spin_unlock_irqrestore(&md->db_lock, flags);
1515
1516         return 0;
1517 }
1518
1519 static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1520 {
1521         list_del(&db_filter->data_node);
1522         list_del(&db_filter->priv_node);
1523         kfree(db_filter);
1524 }
1525
1526 static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1527                                       void __user *arg)
1528 {
1529         struct rio_mport_db_filter *db_filter;
1530         struct rio_doorbell_filter filter;
1531         unsigned long flags;
1532         int ret = -EINVAL;
1533
1534         if (copy_from_user(&filter, arg, sizeof(filter)))
1535                 return -EFAULT;
1536
1537         if (filter.low > filter.high)
1538                 return -EINVAL;
1539
1540         spin_lock_irqsave(&priv->md->db_lock, flags);
1541         list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
1542                 if (db_filter->filter.rioid == filter.rioid &&
1543                     db_filter->filter.low == filter.low &&
1544                     db_filter->filter.high == filter.high) {
1545                         rio_mport_delete_db_filter(db_filter);
1546                         ret = 0;
1547                         break;
1548                 }
1549         }
1550         spin_unlock_irqrestore(&priv->md->db_lock, flags);
1551
1552         if (!ret)
1553                 rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1554
1555         return ret;
1556 }
1557
1558 static int rio_mport_match_pw(union rio_pw_msg *msg,
1559                               struct rio_pw_filter *filter)
1560 {
1561         if ((msg->em.comptag & filter->mask) < filter->low ||
1562                 (msg->em.comptag & filter->mask) > filter->high)
1563                 return 0;
1564         return 1;
1565 }
1566
1567 static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1568                                 union rio_pw_msg *msg, int step)
1569 {
1570         struct mport_dev *md = context;
1571         struct mport_cdev_priv *priv;
1572         struct rio_mport_pw_filter *pw_filter;
1573         struct rio_event event;
1574         int handled;
1575
1576         event.header = RIO_PORTWRITE;
1577         memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
1578
1579         handled = 0;
1580         spin_lock(&md->pw_lock);
1581         list_for_each_entry(pw_filter, &md->portwrites, md_node) {
1582                 if (rio_mport_match_pw(msg, &pw_filter->filter)) {
1583                         priv = pw_filter->priv;
1584                         rio_mport_add_event(priv, &event);
1585                         handled = 1;
1586                 }
1587         }
1588         spin_unlock(&md->pw_lock);
1589
1590         if (!handled) {
1591                 printk_ratelimited(KERN_WARNING DRV_NAME
1592                         ": mport%d received spurious PW from 0x%08x\n",
1593                         mport->id, msg->em.comptag);
1594         }
1595
1596         return 0;
1597 }
1598
1599 static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
1600                                    void __user *arg)
1601 {
1602         struct mport_dev *md = priv->md;
1603         struct rio_mport_pw_filter *pw_filter;
1604         struct rio_pw_filter filter;
1605         unsigned long flags;
1606         int hadd = 0;
1607
1608         if (copy_from_user(&filter, arg, sizeof(filter)))
1609                 return -EFAULT;
1610
1611         pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1612         if (pw_filter == NULL)
1613                 return -ENOMEM;
1614
1615         pw_filter->filter = filter;
1616         pw_filter->priv = priv;
1617         spin_lock_irqsave(&md->pw_lock, flags);
1618         if (list_empty(&md->portwrites))
1619                 hadd = 1;
1620         list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
1621         list_add_tail(&pw_filter->md_node, &md->portwrites);
1622         spin_unlock_irqrestore(&md->pw_lock, flags);
1623
1624         if (hadd) {
1625                 int ret;
1626
1627                 ret = rio_add_mport_pw_handler(md->mport, md,
1628                                                rio_mport_pw_handler);
1629                 if (ret) {
1630                         dev_err(&md->dev,
1631                                 "%s: failed to add IB_PW handler, err=%d\n",
1632                                 __func__, ret);
1633                         return ret;
1634                 }
1635                 rio_pw_enable(md->mport, 1);
1636         }
1637
1638         return 0;
1639 }
1640
1641 static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1642 {
1643         list_del(&pw_filter->md_node);
1644         list_del(&pw_filter->priv_node);
1645         kfree(pw_filter);
1646 }
1647
1648 static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1649                                      struct rio_pw_filter *b)
1650 {
1651         if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1652                 return 1;
1653         return 0;
1654 }
1655
1656 static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
1657                                       void __user *arg)
1658 {
1659         struct mport_dev *md = priv->md;
1660         struct rio_mport_pw_filter *pw_filter;
1661         struct rio_pw_filter filter;
1662         unsigned long flags;
1663         int ret = -EINVAL;
1664         int hdel = 0;
1665
1666         if (copy_from_user(&filter, arg, sizeof(filter)))
1667                 return -EFAULT;
1668
1669         spin_lock_irqsave(&md->pw_lock, flags);
1670         list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
1671                 if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
1672                         rio_mport_delete_pw_filter(pw_filter);
1673                         ret = 0;
1674                         break;
1675                 }
1676         }
1677
1678         if (list_empty(&md->portwrites))
1679                 hdel = 1;
1680         spin_unlock_irqrestore(&md->pw_lock, flags);
1681
1682         if (hdel) {
1683                 rio_del_mport_pw_handler(md->mport, priv->md,
1684                                          rio_mport_pw_handler);
1685                 rio_pw_enable(md->mport, 0);
1686         }
1687
1688         return ret;
1689 }
1690
1691 /*
1692  * rio_release_dev - release routine for kernel RIO device object
1693  * @dev: kernel device object associated with a RIO device structure
1694  *
1695  * Frees a RIO device struct associated a RIO device struct.
1696  * The RIO device struct is freed.
1697  */
1698 static void rio_release_dev(struct device *dev)
1699 {
1700         struct rio_dev *rdev;
1701
1702         rdev = to_rio_dev(dev);
1703         pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1704         kfree(rdev);
1705 }
1706
1707
1708 static void rio_release_net(struct device *dev)
1709 {
1710         struct rio_net *net;
1711
1712         net = to_rio_net(dev);
1713         rmcd_debug(RDEV, "net_%d", net->id);
1714         kfree(net);
1715 }
1716
1717
1718 /*
1719  * rio_mport_add_riodev - creates a kernel RIO device object
1720  *
1721  * Allocates a RIO device data structure and initializes required fields based
1722  * on device's configuration space contents.
1723  * If the device has switch capabilities, then a switch specific portion is
1724  * allocated and configured.
1725  */
1726 static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
1727                                    void __user *arg)
1728 {
1729         struct mport_dev *md = priv->md;
1730         struct rio_rdev_info dev_info;
1731         struct rio_dev *rdev;
1732         struct rio_switch *rswitch = NULL;
1733         struct rio_mport *mport;
1734         size_t size;
1735         u32 rval;
1736         u32 swpinfo = 0;
1737         u16 destid;
1738         u8 hopcount;
1739         int err;
1740
1741         if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1742                 return -EFAULT;
1743
1744         rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1745                    dev_info.comptag, dev_info.destid, dev_info.hopcount);
1746
1747         if (bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name)) {
1748                 rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1749                 return -EEXIST;
1750         }
1751
1752         size = sizeof(*rdev);
1753         mport = md->mport;
1754         destid = dev_info.destid;
1755         hopcount = dev_info.hopcount;
1756
1757         if (rio_mport_read_config_32(mport, destid, hopcount,
1758                                      RIO_PEF_CAR, &rval))
1759                 return -EIO;
1760
1761         if (rval & RIO_PEF_SWITCH) {
1762                 rio_mport_read_config_32(mport, destid, hopcount,
1763                                          RIO_SWP_INFO_CAR, &swpinfo);
1764                 size += (RIO_GET_TOTAL_PORTS(swpinfo) *
1765                          sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
1766         }
1767
1768         rdev = kzalloc(size, GFP_KERNEL);
1769         if (rdev == NULL)
1770                 return -ENOMEM;
1771
1772         if (mport->net == NULL) {
1773                 struct rio_net *net;
1774
1775                 net = rio_alloc_net(mport);
1776                 if (!net) {
1777                         err = -ENOMEM;
1778                         rmcd_debug(RDEV, "failed to allocate net object");
1779                         goto cleanup;
1780                 }
1781
1782                 net->id = mport->id;
1783                 net->hport = mport;
1784                 dev_set_name(&net->dev, "rnet_%d", net->id);
1785                 net->dev.parent = &mport->dev;
1786                 net->dev.release = rio_release_net;
1787                 err = rio_add_net(net);
1788                 if (err) {
1789                         rmcd_debug(RDEV, "failed to register net, err=%d", err);
1790                         kfree(net);
1791                         goto cleanup;
1792                 }
1793         }
1794
1795         rdev->net = mport->net;
1796         rdev->pef = rval;
1797         rdev->swpinfo = swpinfo;
1798         rio_mport_read_config_32(mport, destid, hopcount,
1799                                  RIO_DEV_ID_CAR, &rval);
1800         rdev->did = rval >> 16;
1801         rdev->vid = rval & 0xffff;
1802         rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1803                                  &rdev->device_rev);
1804         rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1805                                  &rval);
1806         rdev->asm_did = rval >> 16;
1807         rdev->asm_vid = rval & 0xffff;
1808         rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1809                                  &rval);
1810         rdev->asm_rev = rval >> 16;
1811
1812         if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1813                 rdev->efptr = rval & 0xffff;
1814                 rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1815                                                 hopcount, &rdev->phys_rmap);
1816
1817                 rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1818                                                 hopcount, RIO_EFB_ERR_MGMNT);
1819         }
1820
1821         rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1822                                  &rdev->src_ops);
1823         rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1824                                  &rdev->dst_ops);
1825
1826         rdev->comp_tag = dev_info.comptag;
1827         rdev->destid = destid;
1828         /* hopcount is stored as specified by a caller, regardles of EP or SW */
1829         rdev->hopcount = hopcount;
1830
1831         if (rdev->pef & RIO_PEF_SWITCH) {
1832                 rswitch = rdev->rswitch;
1833                 rswitch->route_table = NULL;
1834         }
1835
1836         if (strlen(dev_info.name))
1837                 dev_set_name(&rdev->dev, "%s", dev_info.name);
1838         else if (rdev->pef & RIO_PEF_SWITCH)
1839                 dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1840                              rdev->comp_tag & RIO_CTAG_UDEVID);
1841         else
1842                 dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1843                              rdev->comp_tag & RIO_CTAG_UDEVID);
1844
1845         INIT_LIST_HEAD(&rdev->net_list);
1846         rdev->dev.parent = &mport->net->dev;
1847         rio_attach_device(rdev);
1848         rdev->dev.release = rio_release_dev;
1849
1850         if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1851                 rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1852                                    0, 0xffff);
1853         err = rio_add_device(rdev);
1854         if (err)
1855                 goto cleanup;
1856         rio_dev_get(rdev);
1857
1858         return 0;
1859 cleanup:
1860         kfree(rdev);
1861         return err;
1862 }
1863
1864 static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1865 {
1866         struct rio_rdev_info dev_info;
1867         struct rio_dev *rdev = NULL;
1868         struct device  *dev;
1869         struct rio_mport *mport;
1870         struct rio_net *net;
1871
1872         if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1873                 return -EFAULT;
1874
1875         mport = priv->md->mport;
1876
1877         /* If device name is specified, removal by name has priority */
1878         if (strlen(dev_info.name)) {
1879                 dev = bus_find_device_by_name(&rio_bus_type, NULL,
1880                                               dev_info.name);
1881                 if (dev)
1882                         rdev = to_rio_dev(dev);
1883         } else {
1884                 do {
1885                         rdev = rio_get_comptag(dev_info.comptag, rdev);
1886                         if (rdev && rdev->dev.parent == &mport->net->dev &&
1887                             rdev->destid == dev_info.destid &&
1888                             rdev->hopcount == dev_info.hopcount)
1889                                 break;
1890                 } while (rdev);
1891         }
1892
1893         if (!rdev) {
1894                 rmcd_debug(RDEV,
1895                         "device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1896                         dev_info.name, dev_info.comptag, dev_info.destid,
1897                         dev_info.hopcount);
1898                 return -ENODEV;
1899         }
1900
1901         net = rdev->net;
1902         rio_dev_put(rdev);
1903         rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1904
1905         if (list_empty(&net->devices)) {
1906                 rio_free_net(net);
1907                 mport->net = NULL;
1908         }
1909
1910         return 0;
1911 }
1912
1913 /*
1914  * Mport cdev management
1915  */
1916
1917 /*
1918  * mport_cdev_open() - Open character device (mport)
1919  */
1920 static int mport_cdev_open(struct inode *inode, struct file *filp)
1921 {
1922         int ret;
1923         int minor = iminor(inode);
1924         struct mport_dev *chdev;
1925         struct mport_cdev_priv *priv;
1926
1927         /* Test for valid device */
1928         if (minor >= RIO_MAX_MPORTS) {
1929                 rmcd_error("Invalid minor device number");
1930                 return -EINVAL;
1931         }
1932
1933         chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1934
1935         rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1936
1937         if (atomic_read(&chdev->active) == 0)
1938                 return -ENODEV;
1939
1940         get_device(&chdev->dev);
1941
1942         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1943         if (!priv) {
1944                 put_device(&chdev->dev);
1945                 return -ENOMEM;
1946         }
1947
1948         priv->md = chdev;
1949
1950         mutex_lock(&chdev->file_mutex);
1951         list_add_tail(&priv->list, &chdev->file_list);
1952         mutex_unlock(&chdev->file_mutex);
1953
1954         INIT_LIST_HEAD(&priv->db_filters);
1955         INIT_LIST_HEAD(&priv->pw_filters);
1956         spin_lock_init(&priv->fifo_lock);
1957         init_waitqueue_head(&priv->event_rx_wait);
1958         ret = kfifo_alloc(&priv->event_fifo,
1959                           sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
1960                           GFP_KERNEL);
1961         if (ret < 0) {
1962                 dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
1963                 ret = -ENOMEM;
1964                 goto err_fifo;
1965         }
1966
1967 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1968         INIT_LIST_HEAD(&priv->async_list);
1969         INIT_LIST_HEAD(&priv->pend_list);
1970         spin_lock_init(&priv->req_lock);
1971         mutex_init(&priv->dma_lock);
1972 #endif
1973
1974         filp->private_data = priv;
1975         goto out;
1976 err_fifo:
1977         kfree(priv);
1978 out:
1979         return ret;
1980 }
1981
1982 static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1983 {
1984         struct mport_cdev_priv *priv = filp->private_data;
1985
1986         return fasync_helper(fd, filp, mode, &priv->async_queue);
1987 }
1988
1989 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
1990 static void mport_cdev_release_dma(struct file *filp)
1991 {
1992         struct mport_cdev_priv *priv = filp->private_data;
1993         struct mport_dev *md;
1994         struct mport_dma_req *req, *req_next;
1995         unsigned long tmo = msecs_to_jiffies(dma_timeout);
1996         long wret;
1997         LIST_HEAD(list);
1998
1999         rmcd_debug(EXIT, "from filp=%p %s(%d)",
2000                    filp, current->comm, task_pid_nr(current));
2001
2002         if (!priv->dmach) {
2003                 rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
2004                 return;
2005         }
2006
2007         md = priv->md;
2008
2009         flush_workqueue(dma_wq);
2010
2011         spin_lock(&priv->req_lock);
2012         if (!list_empty(&priv->async_list)) {
2013                 rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
2014                            filp, current->comm, task_pid_nr(current));
2015                 list_splice_init(&priv->async_list, &list);
2016         }
2017         spin_unlock(&priv->req_lock);
2018
2019         if (!list_empty(&list)) {
2020                 rmcd_debug(EXIT, "temp list not empty");
2021                 list_for_each_entry_safe(req, req_next, &list, node) {
2022                         rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
2023                                    req->filp, req->cookie,
2024                                    completion_done(&req->req_comp)?"yes":"no");
2025                         list_del(&req->node);
2026                         dma_req_free(req);
2027                 }
2028         }
2029
2030         if (!list_empty(&priv->pend_list)) {
2031                 rmcd_debug(EXIT, "Free pending DMA requests for filp=%p %s(%d)",
2032                            filp, current->comm, task_pid_nr(current));
2033                 list_for_each_entry_safe(req,
2034                                          req_next, &priv->pend_list, node) {
2035                         rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
2036                                    req->filp, req->cookie,
2037                                    completion_done(&req->req_comp)?"yes":"no");
2038                         list_del(&req->node);
2039                         dma_req_free(req);
2040                 }
2041         }
2042
2043         put_dma_channel(priv);
2044         wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
2045
2046         if (wret <= 0) {
2047                 rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
2048                         current->comm, task_pid_nr(current), wret);
2049         }
2050
2051         spin_lock(&priv->req_lock);
2052
2053         if (!list_empty(&priv->pend_list)) {
2054                 rmcd_debug(EXIT, "ATTN: pending DMA requests, filp=%p %s(%d)",
2055                            filp, current->comm, task_pid_nr(current));
2056         }
2057
2058         spin_unlock(&priv->req_lock);
2059
2060         if (priv->dmach != priv->md->dma_chan) {
2061                 rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
2062                            filp, current->comm, task_pid_nr(current));
2063                 rio_release_dma(priv->dmach);
2064         } else {
2065                 rmcd_debug(EXIT, "Adjust default DMA channel refcount");
2066                 kref_put(&md->dma_ref, mport_release_def_dma);
2067         }
2068
2069         priv->dmach = NULL;
2070 }
2071 #else
2072 #define mport_cdev_release_dma(priv) do {} while (0)
2073 #endif
2074
2075 /*
2076  * mport_cdev_release() - Release character device
2077  */
2078 static int mport_cdev_release(struct inode *inode, struct file *filp)
2079 {
2080         struct mport_cdev_priv *priv = filp->private_data;
2081         struct mport_dev *chdev;
2082         struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
2083         struct rio_mport_db_filter *db_filter, *db_filter_next;
2084         struct rio_mport_mapping *map, *_map;
2085         unsigned long flags;
2086
2087         rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2088
2089         chdev = priv->md;
2090         mport_cdev_release_dma(filp);
2091
2092         priv->event_mask = 0;
2093
2094         spin_lock_irqsave(&chdev->pw_lock, flags);
2095         if (!list_empty(&priv->pw_filters)) {
2096                 list_for_each_entry_safe(pw_filter, pw_filter_next,
2097                                          &priv->pw_filters, priv_node)
2098                         rio_mport_delete_pw_filter(pw_filter);
2099         }
2100         spin_unlock_irqrestore(&chdev->pw_lock, flags);
2101
2102         spin_lock_irqsave(&chdev->db_lock, flags);
2103         list_for_each_entry_safe(db_filter, db_filter_next,
2104                                  &priv->db_filters, priv_node) {
2105                 rio_mport_delete_db_filter(db_filter);
2106         }
2107         spin_unlock_irqrestore(&chdev->db_lock, flags);
2108
2109         kfifo_free(&priv->event_fifo);
2110
2111         mutex_lock(&chdev->buf_mutex);
2112         list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
2113                 if (map->filp == filp) {
2114                         rmcd_debug(EXIT, "release mapping %p filp=%p",
2115                                    map->virt_addr, filp);
2116                         kref_put(&map->ref, mport_release_mapping);
2117                 }
2118         }
2119         mutex_unlock(&chdev->buf_mutex);
2120
2121         mport_cdev_fasync(-1, filp, 0);
2122         filp->private_data = NULL;
2123         mutex_lock(&chdev->file_mutex);
2124         list_del(&priv->list);
2125         mutex_unlock(&chdev->file_mutex);
2126         put_device(&chdev->dev);
2127         kfree(priv);
2128         return 0;
2129 }
2130
2131 /*
2132  * mport_cdev_ioctl() - IOCTLs for character device
2133  */
2134 static long mport_cdev_ioctl(struct file *filp,
2135                 unsigned int cmd, unsigned long arg)
2136 {
2137         int err = -EINVAL;
2138         struct mport_cdev_priv *data = filp->private_data;
2139         struct mport_dev *md = data->md;
2140
2141         if (atomic_read(&md->active) == 0)
2142                 return -ENODEV;
2143
2144         switch (cmd) {
2145         case RIO_MPORT_MAINT_READ_LOCAL:
2146                 return rio_mport_maint_rd(data, (void __user *)arg, 1);
2147         case RIO_MPORT_MAINT_WRITE_LOCAL:
2148                 return rio_mport_maint_wr(data, (void __user *)arg, 1);
2149         case RIO_MPORT_MAINT_READ_REMOTE:
2150                 return rio_mport_maint_rd(data, (void __user *)arg, 0);
2151         case RIO_MPORT_MAINT_WRITE_REMOTE:
2152                 return rio_mport_maint_wr(data, (void __user *)arg, 0);
2153         case RIO_MPORT_MAINT_HDID_SET:
2154                 return maint_hdid_set(data, (void __user *)arg);
2155         case RIO_MPORT_MAINT_COMPTAG_SET:
2156                 return maint_comptag_set(data, (void __user *)arg);
2157         case RIO_MPORT_MAINT_PORT_IDX_GET:
2158                 return maint_port_idx_get(data, (void __user *)arg);
2159         case RIO_MPORT_GET_PROPERTIES:
2160                 md->properties.hdid = md->mport->host_deviceid;
2161                 if (copy_to_user((void __user *)arg, &(md->properties),
2162                                  sizeof(md->properties)))
2163                         return -EFAULT;
2164                 return 0;
2165         case RIO_ENABLE_DOORBELL_RANGE:
2166                 return rio_mport_add_db_filter(data, (void __user *)arg);
2167         case RIO_DISABLE_DOORBELL_RANGE:
2168                 return rio_mport_remove_db_filter(data, (void __user *)arg);
2169         case RIO_ENABLE_PORTWRITE_RANGE:
2170                 return rio_mport_add_pw_filter(data, (void __user *)arg);
2171         case RIO_DISABLE_PORTWRITE_RANGE:
2172                 return rio_mport_remove_pw_filter(data, (void __user *)arg);
2173         case RIO_SET_EVENT_MASK:
2174                 data->event_mask = (u32)arg;
2175                 return 0;
2176         case RIO_GET_EVENT_MASK:
2177                 if (copy_to_user((void __user *)arg, &data->event_mask,
2178                                     sizeof(u32)))
2179                         return -EFAULT;
2180                 return 0;
2181         case RIO_MAP_OUTBOUND:
2182                 return rio_mport_obw_map(filp, (void __user *)arg);
2183         case RIO_MAP_INBOUND:
2184                 return rio_mport_map_inbound(filp, (void __user *)arg);
2185         case RIO_UNMAP_OUTBOUND:
2186                 return rio_mport_obw_free(filp, (void __user *)arg);
2187         case RIO_UNMAP_INBOUND:
2188                 return rio_mport_inbound_free(filp, (void __user *)arg);
2189         case RIO_ALLOC_DMA:
2190                 return rio_mport_alloc_dma(filp, (void __user *)arg);
2191         case RIO_FREE_DMA:
2192                 return rio_mport_free_dma(filp, (void __user *)arg);
2193         case RIO_WAIT_FOR_ASYNC:
2194                 return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
2195         case RIO_TRANSFER:
2196                 return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2197         case RIO_DEV_ADD:
2198                 return rio_mport_add_riodev(data, (void __user *)arg);
2199         case RIO_DEV_DEL:
2200                 return rio_mport_del_riodev(data, (void __user *)arg);
2201         default:
2202                 break;
2203         }
2204
2205         return err;
2206 }
2207
2208 /*
2209  * mport_release_mapping - free mapping resources and info structure
2210  * @ref: a pointer to the kref within struct rio_mport_mapping
2211  *
2212  * NOTE: Shall be called while holding buf_mutex.
2213  */
2214 static void mport_release_mapping(struct kref *ref)
2215 {
2216         struct rio_mport_mapping *map =
2217                         container_of(ref, struct rio_mport_mapping, ref);
2218         struct rio_mport *mport = map->md->mport;
2219
2220         rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2221                    map->dir, map->virt_addr,
2222                    &map->phys_addr, mport->name);
2223
2224         list_del(&map->node);
2225
2226         switch (map->dir) {
2227         case MAP_INBOUND:
2228                 rio_unmap_inb_region(mport, map->phys_addr);
2229         case MAP_DMA:
2230                 dma_free_coherent(mport->dev.parent, map->size,
2231                                   map->virt_addr, map->phys_addr);
2232                 break;
2233         case MAP_OUTBOUND:
2234                 rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2235                 break;
2236         }
2237         kfree(map);
2238 }
2239
2240 static void mport_mm_open(struct vm_area_struct *vma)
2241 {
2242         struct rio_mport_mapping *map = vma->vm_private_data;
2243
2244         rmcd_debug(MMAP, "%pad", &map->phys_addr);
2245         kref_get(&map->ref);
2246 }
2247
2248 static void mport_mm_close(struct vm_area_struct *vma)
2249 {
2250         struct rio_mport_mapping *map = vma->vm_private_data;
2251
2252         rmcd_debug(MMAP, "%pad", &map->phys_addr);
2253         mutex_lock(&map->md->buf_mutex);
2254         kref_put(&map->ref, mport_release_mapping);
2255         mutex_unlock(&map->md->buf_mutex);
2256 }
2257
2258 static const struct vm_operations_struct vm_ops = {
2259         .open = mport_mm_open,
2260         .close = mport_mm_close,
2261 };
2262
2263 static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2264 {
2265         struct mport_cdev_priv *priv = filp->private_data;
2266         struct mport_dev *md;
2267         size_t size = vma->vm_end - vma->vm_start;
2268         dma_addr_t baddr;
2269         unsigned long offset;
2270         int found = 0, ret;
2271         struct rio_mport_mapping *map;
2272
2273         rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2274                    (unsigned int)size, vma->vm_pgoff);
2275
2276         md = priv->md;
2277         baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
2278
2279         mutex_lock(&md->buf_mutex);
2280         list_for_each_entry(map, &md->mappings, node) {
2281                 if (baddr >= map->phys_addr &&
2282                     baddr < (map->phys_addr + map->size)) {
2283                         found = 1;
2284                         break;
2285                 }
2286         }
2287         mutex_unlock(&md->buf_mutex);
2288
2289         if (!found)
2290                 return -ENOMEM;
2291
2292         offset = baddr - map->phys_addr;
2293
2294         if (size + offset > map->size)
2295                 return -EINVAL;
2296
2297         vma->vm_pgoff = offset >> PAGE_SHIFT;
2298         rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
2299
2300         if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
2301                 ret = dma_mmap_coherent(md->mport->dev.parent, vma,
2302                                 map->virt_addr, map->phys_addr, map->size);
2303         else if (map->dir == MAP_OUTBOUND) {
2304                 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
2305                 ret = vm_iomap_memory(vma, map->phys_addr, map->size);
2306         } else {
2307                 rmcd_error("Attempt to mmap unsupported mapping type");
2308                 ret = -EIO;
2309         }
2310
2311         if (!ret) {
2312                 vma->vm_private_data = map;
2313                 vma->vm_ops = &vm_ops;
2314                 mport_mm_open(vma);
2315         } else {
2316                 rmcd_error("MMAP exit with err=%d", ret);
2317         }
2318
2319         return ret;
2320 }
2321
2322 static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait)
2323 {
2324         struct mport_cdev_priv *priv = filp->private_data;
2325
2326         poll_wait(filp, &priv->event_rx_wait, wait);
2327         if (kfifo_len(&priv->event_fifo))
2328                 return EPOLLIN | EPOLLRDNORM;
2329
2330         return 0;
2331 }
2332
2333 static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2334                         loff_t *ppos)
2335 {
2336         struct mport_cdev_priv *priv = filp->private_data;
2337         int copied;
2338         ssize_t ret;
2339
2340         if (!count)
2341                 return 0;
2342
2343         if (kfifo_is_empty(&priv->event_fifo) &&
2344             (filp->f_flags & O_NONBLOCK))
2345                 return -EAGAIN;
2346
2347         if (count % sizeof(struct rio_event))
2348                 return -EINVAL;
2349
2350         ret = wait_event_interruptible(priv->event_rx_wait,
2351                                         kfifo_len(&priv->event_fifo) != 0);
2352         if (ret)
2353                 return ret;
2354
2355         while (ret < count) {
2356                 if (kfifo_to_user(&priv->event_fifo, buf,
2357                       sizeof(struct rio_event), &copied))
2358                         return -EFAULT;
2359                 ret += copied;
2360                 buf += copied;
2361         }
2362
2363         return ret;
2364 }
2365
2366 static ssize_t mport_write(struct file *filp, const char __user *buf,
2367                          size_t count, loff_t *ppos)
2368 {
2369         struct mport_cdev_priv *priv = filp->private_data;
2370         struct rio_mport *mport = priv->md->mport;
2371         struct rio_event event;
2372         int len, ret;
2373
2374         if (!count)
2375                 return 0;
2376
2377         if (count % sizeof(event))
2378                 return -EINVAL;
2379
2380         len = 0;
2381         while ((count - len) >= (int)sizeof(event)) {
2382                 if (copy_from_user(&event, buf, sizeof(event)))
2383                         return -EFAULT;
2384
2385                 if (event.header != RIO_DOORBELL)
2386                         return -EINVAL;
2387
2388                 ret = rio_mport_send_doorbell(mport,
2389                                               event.u.doorbell.rioid,
2390                                               event.u.doorbell.payload);
2391                 if (ret < 0)
2392                         return ret;
2393
2394                 len += sizeof(event);
2395                 buf += sizeof(event);
2396         }
2397
2398         return len;
2399 }
2400
2401 static const struct file_operations mport_fops = {
2402         .owner          = THIS_MODULE,
2403         .open           = mport_cdev_open,
2404         .release        = mport_cdev_release,
2405         .poll           = mport_cdev_poll,
2406         .read           = mport_read,
2407         .write          = mport_write,
2408         .mmap           = mport_cdev_mmap,
2409         .fasync         = mport_cdev_fasync,
2410         .unlocked_ioctl = mport_cdev_ioctl
2411 };
2412
2413 /*
2414  * Character device management
2415  */
2416
2417 static void mport_device_release(struct device *dev)
2418 {
2419         struct mport_dev *md;
2420
2421         rmcd_debug(EXIT, "%s", dev_name(dev));
2422         md = container_of(dev, struct mport_dev, dev);
2423         kfree(md);
2424 }
2425
2426 /*
2427  * mport_cdev_add() - Create mport_dev from rio_mport
2428  * @mport:      RapidIO master port
2429  */
2430 static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2431 {
2432         int ret = 0;
2433         struct mport_dev *md;
2434         struct rio_mport_attr attr;
2435
2436         md = kzalloc(sizeof(*md), GFP_KERNEL);
2437         if (!md) {
2438                 rmcd_error("Unable allocate a device object");
2439                 return NULL;
2440         }
2441
2442         md->mport = mport;
2443         mutex_init(&md->buf_mutex);
2444         mutex_init(&md->file_mutex);
2445         INIT_LIST_HEAD(&md->file_list);
2446
2447         device_initialize(&md->dev);
2448         md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
2449         md->dev.class = dev_class;
2450         md->dev.parent = &mport->dev;
2451         md->dev.release = mport_device_release;
2452         dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
2453         atomic_set(&md->active, 1);
2454
2455         cdev_init(&md->cdev, &mport_fops);
2456         md->cdev.owner = THIS_MODULE;
2457
2458         ret = cdev_device_add(&md->cdev, &md->dev);
2459         if (ret) {
2460                 rmcd_error("Failed to register mport %d (err=%d)",
2461                        mport->id, ret);
2462                 goto err_cdev;
2463         }
2464
2465         INIT_LIST_HEAD(&md->doorbells);
2466         spin_lock_init(&md->db_lock);
2467         INIT_LIST_HEAD(&md->portwrites);
2468         spin_lock_init(&md->pw_lock);
2469         INIT_LIST_HEAD(&md->mappings);
2470
2471         md->properties.id = mport->id;
2472         md->properties.sys_size = mport->sys_size;
2473         md->properties.hdid = mport->host_deviceid;
2474         md->properties.index = mport->index;
2475
2476         /* The transfer_mode property will be returned through mport query
2477          * interface
2478          */
2479 #ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2480         md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2481 #else
2482         md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2483 #endif
2484         ret = rio_query_mport(mport, &attr);
2485         if (!ret) {
2486                 md->properties.flags = attr.flags;
2487                 md->properties.link_speed = attr.link_speed;
2488                 md->properties.link_width = attr.link_width;
2489                 md->properties.dma_max_sge = attr.dma_max_sge;
2490                 md->properties.dma_max_size = attr.dma_max_size;
2491                 md->properties.dma_align = attr.dma_align;
2492                 md->properties.cap_sys_size = 0;
2493                 md->properties.cap_transfer_mode = 0;
2494                 md->properties.cap_addr_size = 0;
2495         } else
2496                 pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2497                         mport->name, MAJOR(dev_number), mport->id);
2498
2499         mutex_lock(&mport_devs_lock);
2500         list_add_tail(&md->node, &mport_devs);
2501         mutex_unlock(&mport_devs_lock);
2502
2503         pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2504                 mport->name, MAJOR(dev_number), mport->id);
2505
2506         return md;
2507
2508 err_cdev:
2509         put_device(&md->dev);
2510         return NULL;
2511 }
2512
2513 /*
2514  * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2515  *                              associated DMA channels.
2516  */
2517 static void mport_cdev_terminate_dma(struct mport_dev *md)
2518 {
2519 #ifdef CONFIG_RAPIDIO_DMA_ENGINE
2520         struct mport_cdev_priv *client;
2521
2522         rmcd_debug(DMA, "%s", dev_name(&md->dev));
2523
2524         mutex_lock(&md->file_mutex);
2525         list_for_each_entry(client, &md->file_list, list) {
2526                 if (client->dmach) {
2527                         dmaengine_terminate_all(client->dmach);
2528                         rio_release_dma(client->dmach);
2529                 }
2530         }
2531         mutex_unlock(&md->file_mutex);
2532
2533         if (md->dma_chan) {
2534                 dmaengine_terminate_all(md->dma_chan);
2535                 rio_release_dma(md->dma_chan);
2536                 md->dma_chan = NULL;
2537         }
2538 #endif
2539 }
2540
2541
2542 /*
2543  * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2544  *                            mport_cdev files.
2545  */
2546 static int mport_cdev_kill_fasync(struct mport_dev *md)
2547 {
2548         unsigned int files = 0;
2549         struct mport_cdev_priv *client;
2550
2551         mutex_lock(&md->file_mutex);
2552         list_for_each_entry(client, &md->file_list, list) {
2553                 if (client->async_queue)
2554                         kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
2555                 files++;
2556         }
2557         mutex_unlock(&md->file_mutex);
2558         return files;
2559 }
2560
2561 /*
2562  * mport_cdev_remove() - Remove mport character device
2563  * @dev:        Mport device to remove
2564  */
2565 static void mport_cdev_remove(struct mport_dev *md)
2566 {
2567         struct rio_mport_mapping *map, *_map;
2568
2569         rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
2570         atomic_set(&md->active, 0);
2571         mport_cdev_terminate_dma(md);
2572         rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2573         cdev_device_del(&md->cdev, &md->dev);
2574         mport_cdev_kill_fasync(md);
2575
2576         flush_workqueue(dma_wq);
2577
2578         /* TODO: do we need to give clients some time to close file
2579          * descriptors? Simple wait for XX, or kref?
2580          */
2581
2582         /*
2583          * Release DMA buffers allocated for the mport device.
2584          * Disable associated inbound Rapidio requests mapping if applicable.
2585          */
2586         mutex_lock(&md->buf_mutex);
2587         list_for_each_entry_safe(map, _map, &md->mappings, node) {
2588                 kref_put(&map->ref, mport_release_mapping);
2589         }
2590         mutex_unlock(&md->buf_mutex);
2591
2592         if (!list_empty(&md->mappings))
2593                 rmcd_warn("WARNING: %s pending mappings on removal",
2594                           md->mport->name);
2595
2596         rio_release_inb_dbell(md->mport, 0, 0x0fff);
2597
2598         put_device(&md->dev);
2599 }
2600
2601 /*
2602  * RIO rio_mport_interface driver
2603  */
2604
2605 /*
2606  * mport_add_mport() - Add rio_mport from LDM device struct
2607  * @dev:                Linux device model struct
2608  * @class_intf: Linux class_interface
2609  */
2610 static int mport_add_mport(struct device *dev,
2611                 struct class_interface *class_intf)
2612 {
2613         struct rio_mport *mport = NULL;
2614         struct mport_dev *chdev = NULL;
2615
2616         mport = to_rio_mport(dev);
2617         if (!mport)
2618                 return -ENODEV;
2619
2620         chdev = mport_cdev_add(mport);
2621         if (!chdev)
2622                 return -ENODEV;
2623
2624         return 0;
2625 }
2626
2627 /*
2628  * mport_remove_mport() - Remove rio_mport from global list
2629  * TODO remove device from global mport_dev list
2630  */
2631 static void mport_remove_mport(struct device *dev,
2632                 struct class_interface *class_intf)
2633 {
2634         struct rio_mport *mport = NULL;
2635         struct mport_dev *chdev;
2636         int found = 0;
2637
2638         mport = to_rio_mport(dev);
2639         rmcd_debug(EXIT, "Remove %s", mport->name);
2640
2641         mutex_lock(&mport_devs_lock);
2642         list_for_each_entry(chdev, &mport_devs, node) {
2643                 if (chdev->mport->id == mport->id) {
2644                         atomic_set(&chdev->active, 0);
2645                         list_del(&chdev->node);
2646                         found = 1;
2647                         break;
2648                 }
2649         }
2650         mutex_unlock(&mport_devs_lock);
2651
2652         if (found)
2653                 mport_cdev_remove(chdev);
2654 }
2655
2656 /* the rio_mport_interface is used to handle local mport devices */
2657 static struct class_interface rio_mport_interface __refdata = {
2658         .class          = &rio_mport_class,
2659         .add_dev        = mport_add_mport,
2660         .remove_dev     = mport_remove_mport,
2661 };
2662
2663 /*
2664  * Linux kernel module
2665  */
2666
2667 /*
2668  * mport_init - Driver module loading
2669  */
2670 static int __init mport_init(void)
2671 {
2672         int ret;
2673
2674         /* Create device class needed by udev */
2675         dev_class = class_create(THIS_MODULE, DRV_NAME);
2676         if (IS_ERR(dev_class)) {
2677                 rmcd_error("Unable to create " DRV_NAME " class");
2678                 return PTR_ERR(dev_class);
2679         }
2680
2681         ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2682         if (ret < 0)
2683                 goto err_chr;
2684
2685         rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2686
2687         /* Register to rio_mport_interface */
2688         ret = class_interface_register(&rio_mport_interface);
2689         if (ret) {
2690                 rmcd_error("class_interface_register() failed, err=%d", ret);
2691                 goto err_cli;
2692         }
2693
2694         dma_wq = create_singlethread_workqueue("dma_wq");
2695         if (!dma_wq) {
2696                 rmcd_error("failed to create DMA work queue");
2697                 ret = -ENOMEM;
2698                 goto err_wq;
2699         }
2700
2701         return 0;
2702
2703 err_wq:
2704         class_interface_unregister(&rio_mport_interface);
2705 err_cli:
2706         unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2707 err_chr:
2708         class_destroy(dev_class);
2709         return ret;
2710 }
2711
2712 /**
2713  * mport_exit - Driver module unloading
2714  */
2715 static void __exit mport_exit(void)
2716 {
2717         class_interface_unregister(&rio_mport_interface);
2718         class_destroy(dev_class);
2719         unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2720         destroy_workqueue(dma_wq);
2721 }
2722
2723 module_init(mport_init);
2724 module_exit(mport_exit);