drivers/rapidio/devices/rio_mport_cdev.c

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