1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * RapidIO mport character device
   4 *
   5 * Copyright 2014-2015 Integrated Device Technology, Inc.
   6 *    Alexandre Bounine <alexandre.bounine@idt.com>
   7 * Copyright 2014-2015 Prodrive Technologies
   8 *    Andre van Herk <andre.van.herk@prodrive-technologies.com>
   9 *    Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
  10 * Copyright (C) 2014 Texas Instruments Incorporated
  11 *    Aurelien Jacquiot <a-jacquiot@ti.com>
  12 */
  13#include <linux/module.h>
  14#include <linux/kernel.h>
  15#include <linux/cdev.h>
  16#include <linux/ioctl.h>
  17#include <linux/uaccess.h>
  18#include <linux/list.h>
  19#include <linux/fs.h>
  20#include <linux/err.h>
  21#include <linux/net.h>
  22#include <linux/poll.h>
  23#include <linux/spinlock.h>
  24#include <linux/sched.h>
  25#include <linux/kfifo.h>
  26
  27#include <linux/mm.h>
  28#include <linux/slab.h>
  29#include <linux/vmalloc.h>
  30#include <linux/mman.h>
  31
  32#include <linux/dma-mapping.h>
  33#ifdef CONFIG_RAPIDIO_DMA_ENGINE
  34#include <linux/dmaengine.h>
  35#endif
  36
  37#include <linux/rio.h>
  38#include <linux/rio_ids.h>
  39#include <linux/rio_drv.h>
  40#include <linux/rio_mport_cdev.h>
  41
  42#include "../rio.h"
  43
  44#define DRV_NAME	"rio_mport"
  45#define DRV_PREFIX	DRV_NAME ": "
  46#define DEV_NAME	"rio_mport"
  47#define DRV_VERSION     "1.0.0"
  48
  49/* Debug output filtering masks */
  50enum {
  51	DBG_NONE	= 0,
  52	DBG_INIT	= BIT(0), /* driver init */
  53	DBG_EXIT	= BIT(1), /* driver exit */
  54	DBG_MPORT	= BIT(2), /* mport add/remove */
  55	DBG_RDEV	= BIT(3), /* RapidIO device add/remove */
  56	DBG_DMA		= BIT(4), /* DMA transfer messages */
  57	DBG_MMAP	= BIT(5), /* mapping messages */
  58	DBG_IBW		= BIT(6), /* inbound window */
  59	DBG_EVENT	= BIT(7), /* event handling messages */
  60	DBG_OBW		= BIT(8), /* outbound window messages */
  61	DBG_DBELL	= BIT(9), /* doorbell messages */
  62	DBG_ALL		= ~0,
  63};
  64
  65#ifdef DEBUG
  66#define rmcd_debug(level, fmt, arg...)		\
  67	do {					\
  68		if (DBG_##level & dbg_level)	\
  69			pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
  70	} while (0)
  71#else
  72#define rmcd_debug(level, fmt, arg...) \
  73		no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
  74#endif
  75
  76#define rmcd_warn(fmt, arg...) \
  77	pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)
  78
  79#define rmcd_error(fmt, arg...) \
  80	pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)
  81
  82MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>");
  83MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>");
  84MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
  85MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>");
  86MODULE_DESCRIPTION("RapidIO mport character device driver");
  87MODULE_LICENSE("GPL");
  88MODULE_VERSION(DRV_VERSION);
  89
  90static int dma_timeout = 3000; /* DMA transfer timeout in msec */
  91module_param(dma_timeout, int, S_IRUGO);
  92MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)");
  93
  94#ifdef DEBUG
  95static u32 dbg_level = DBG_NONE;
  96module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO);
  97MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
  98#endif
  99
 100/*
 101 * An internal DMA coherent buffer
 102 */
 103struct mport_dma_buf {
 104	void		*ib_base;
 105	dma_addr_t	ib_phys;
 106	u32		ib_size;
 107	u64		ib_rio_base;
 108	bool		ib_map;
 109	struct file	*filp;
 110};
 111
 112/*
 113 * Internal memory mapping structure
 114 */
 115enum rio_mport_map_dir {
 116	MAP_INBOUND,
 117	MAP_OUTBOUND,
 118	MAP_DMA,
 119};
 120
 121struct rio_mport_mapping {
 122	struct list_head node;
 123	struct mport_dev *md;
 124	enum rio_mport_map_dir dir;
 125	u16 rioid;
 126	u64 rio_addr;
 127	dma_addr_t phys_addr; /* for mmap */
 128	void *virt_addr; /* kernel address, for dma_free_coherent */
 129	u64 size;
 130	struct kref ref; /* refcount of vmas sharing the mapping */
 131	struct file *filp;
 132};
 133
 134struct rio_mport_dma_map {
 135	int valid;
 136	u64 length;
 137	void *vaddr;
 138	dma_addr_t paddr;
 139};
 140
 141#define MPORT_MAX_DMA_BUFS	16
 142#define MPORT_EVENT_DEPTH	10
 143
 144/*
 145 * mport_dev  driver-specific structure that represents mport device
 146 * @active    mport device status flag
 147 * @node      list node to maintain list of registered mports
 148 * @cdev      character device
 149 * @dev       associated device object
 150 * @mport     associated subsystem's master port device object
 151 * @buf_mutex lock for buffer handling
 152 * @file_mutex - lock for open files list
 153 * @file_list  - list of open files on given mport
 154 * @properties properties of this mport
 155 * @portwrites queue of inbound portwrites
 156 * @pw_lock    lock for port write queue
 157 * @mappings   queue for memory mappings
 158 * @dma_chan   DMA channels associated with this device
 159 * @dma_ref:
 160 * @comp:
 161 */
 162struct mport_dev {
 163	atomic_t		active;
 164	struct list_head	node;
 165	struct cdev		cdev;
 166	struct device		dev;
 167	struct rio_mport	*mport;
 168	struct mutex		buf_mutex;
 169	struct mutex		file_mutex;
 170	struct list_head	file_list;
 171	struct rio_mport_properties	properties;
 172	struct list_head		doorbells;
 173	spinlock_t			db_lock;
 174	struct list_head		portwrites;
 175	spinlock_t			pw_lock;
 176	struct list_head	mappings;
 177#ifdef CONFIG_RAPIDIO_DMA_ENGINE
 178	struct dma_chan *dma_chan;
 179	struct kref	dma_ref;
 180	struct completion comp;
 181#endif
 182};
 183
 184/*
 185 * mport_cdev_priv - data structure specific to individual file object
 186 *                   associated with an open device
 187 * @md    master port character device object
 188 * @async_queue - asynchronous notification queue
 189 * @list - file objects tracking list
 190 * @db_filters    inbound doorbell filters for this descriptor
 191 * @pw_filters    portwrite filters for this descriptor
 192 * @event_fifo    event fifo for this descriptor
 193 * @event_rx_wait wait queue for this descriptor
 194 * @fifo_lock     lock for event_fifo
 195 * @event_mask    event mask for this descriptor
 196 * @dmach DMA engine channel allocated for specific file object
 197 */
 198struct mport_cdev_priv {
 199	struct mport_dev	*md;
 200	struct fasync_struct	*async_queue;
 201	struct list_head	list;
 202	struct list_head	db_filters;
 203	struct list_head        pw_filters;
 204	struct kfifo            event_fifo;
 205	wait_queue_head_t       event_rx_wait;
 206	spinlock_t              fifo_lock;
 207	u32			event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
 208#ifdef CONFIG_RAPIDIO_DMA_ENGINE
 209	struct dma_chan		*dmach;
 210	struct list_head	async_list;
 211	spinlock_t              req_lock;
 212	struct mutex		dma_lock;
 213	struct kref		dma_ref;
 214	struct completion	comp;
 215#endif
 216};
 217
 218/*
 219 * rio_mport_pw_filter - structure to describe a portwrite filter
 220 * md_node   node in mport device's list
 221 * priv_node node in private file object's list
 222 * priv      reference to private data
 223 * filter    actual portwrite filter
 224 */
 225struct rio_mport_pw_filter {
 226	struct list_head md_node;
 227	struct list_head priv_node;
 228	struct mport_cdev_priv *priv;
 229	struct rio_pw_filter filter;
 230};
 231
 232/*
 233 * rio_mport_db_filter - structure to describe a doorbell filter
 234 * @data_node reference to device node
 235 * @priv_node node in private data
 236 * @priv      reference to private data
 237 * @filter    actual doorbell filter
 238 */
 239struct rio_mport_db_filter {
 240	struct list_head data_node;
 241	struct list_head priv_node;
 242	struct mport_cdev_priv *priv;
 243	struct rio_doorbell_filter filter;
 244};
 245
 246static LIST_HEAD(mport_devs);
 247static DEFINE_MUTEX(mport_devs_lock);
 248
 249#if (0) /* used by commented out portion of poll function : FIXME */
 250static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
 251#endif
 252
 253static const struct class dev_class = {
 254	.name = DRV_NAME,
 255};
 256static dev_t dev_number;
 257
 258static void mport_release_mapping(struct kref *ref);
 259
 260static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
 261			      int local)
 262{
 263	struct rio_mport *mport = priv->md->mport;
 264	struct rio_mport_maint_io maint_io;
 265	u32 *buffer;
 266	u32 offset;
 267	size_t length;
 268	int ret, i;
 269
 270	if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
 271		return -EFAULT;
 272
 273	if ((maint_io.offset % 4) ||
 274	    (maint_io.length == 0) || (maint_io.length % 4) ||
 275	    (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
 276		return -EINVAL;
 277
 278	buffer = vmalloc(maint_io.length);
 279	if (buffer == NULL)
 280		return -ENOMEM;
 281	length = maint_io.length/sizeof(u32);
 282	offset = maint_io.offset;
 283
 284	for (i = 0; i < length; i++) {
 285		if (local)
 286			ret = __rio_local_read_config_32(mport,
 287				offset, &buffer[i]);
 288		else
 289			ret = rio_mport_read_config_32(mport, maint_io.rioid,
 290				maint_io.hopcount, offset, &buffer[i]);
 291		if (ret)
 292			goto out;
 293
 294		offset += 4;
 295	}
 296
 297	if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
 298				   buffer, maint_io.length)))
 299		ret = -EFAULT;
 300out:
 301	vfree(buffer);
 302	return ret;
 303}
 304
 305static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
 306			      int local)
 307{
 308	struct rio_mport *mport = priv->md->mport;
 309	struct rio_mport_maint_io maint_io;
 310	u32 *buffer;
 311	u32 offset;
 312	size_t length;
 313	int ret = -EINVAL, i;
 314
 315	if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
 316		return -EFAULT;
 317
 318	if ((maint_io.offset % 4) ||
 319	    (maint_io.length == 0) || (maint_io.length % 4) ||
 320	    (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
 321		return -EINVAL;
 322
 323	buffer = vmalloc(maint_io.length);
 324	if (buffer == NULL)
 325		return -ENOMEM;
 326	length = maint_io.length;
 327
 328	if (unlikely(copy_from_user(buffer,
 329			(void __user *)(uintptr_t)maint_io.buffer, length))) {
 330		ret = -EFAULT;
 331		goto out;
 332	}
 333
 334	offset = maint_io.offset;
 335	length /= sizeof(u32);
 336
 337	for (i = 0; i < length; i++) {
 338		if (local)
 339			ret = __rio_local_write_config_32(mport,
 340							  offset, buffer[i]);
 341		else
 342			ret = rio_mport_write_config_32(mport, maint_io.rioid,
 343							maint_io.hopcount,
 344							offset, buffer[i]);
 345		if (ret)
 346			goto out;
 347
 348		offset += 4;
 349	}
 350
 351out:
 352	vfree(buffer);
 353	return ret;
 354}
 355
 356
 357/*
 358 * Inbound/outbound memory mapping functions
 359 */
 360static int
 361rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
 362				  u16 rioid, u64 raddr, u32 size,
 363				  dma_addr_t *paddr)
 364{
 365	struct rio_mport *mport = md->mport;
 366	struct rio_mport_mapping *map;
 367	int ret;
 368
 369	rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);
 370
 371	map = kzalloc(sizeof(*map), GFP_KERNEL);
 372	if (map == NULL)
 373		return -ENOMEM;
 374
 375	ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
 376	if (ret < 0)
 377		goto err_map_outb;
 378
 379	map->dir = MAP_OUTBOUND;
 380	map->rioid = rioid;
 381	map->rio_addr = raddr;
 382	map->size = size;
 383	map->phys_addr = *paddr;
 384	map->filp = filp;
 385	map->md = md;
 386	kref_init(&map->ref);
 387	list_add_tail(&map->node, &md->mappings);
 388	return 0;
 389err_map_outb:
 390	kfree(map);
 391	return ret;
 392}
 393
 394static int
 395rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
 396			       u16 rioid, u64 raddr, u32 size,
 397			       dma_addr_t *paddr)
 398{
 399	struct rio_mport_mapping *map;
 400	int err = -ENOMEM;
 401
 402	mutex_lock(&md->buf_mutex);
 403	list_for_each_entry(map, &md->mappings, node) {
 404		if (map->dir != MAP_OUTBOUND)
 405			continue;
 406		if (rioid == map->rioid &&
 407		    raddr == map->rio_addr && size == map->size) {
 408			*paddr = map->phys_addr;
 409			err = 0;
 410			break;
 411		} else if (rioid == map->rioid &&
 412			   raddr < (map->rio_addr + map->size - 1) &&
 413			   (raddr + size) > map->rio_addr) {
 414			err = -EBUSY;
 415			break;
 416		}
 417	}
 418
 419	/* If not found, create new */
 420	if (err == -ENOMEM)
 421		err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
 422						size, paddr);
 423	mutex_unlock(&md->buf_mutex);
 424	return err;
 425}
 426
 427static int rio_mport_obw_map(struct file *filp, void __user *arg)
 428{
 429	struct mport_cdev_priv *priv = filp->private_data;
 430	struct mport_dev *data = priv->md;
 431	struct rio_mmap map;
 432	dma_addr_t paddr;
 433	int ret;
 434
 435	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
 436		return -EFAULT;
 437
 438	rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
 439		   map.rioid, map.rio_addr, map.length);
 440
 441	ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
 442					     map.rio_addr, map.length, &paddr);
 443	if (ret < 0) {
 444		rmcd_error("Failed to set OBW err= %d", ret);
 445		return ret;
 446	}
 447
 448	map.handle = paddr;
 449
 450	if (unlikely(copy_to_user(arg, &map, sizeof(map))))
 451		return -EFAULT;
 452	return 0;
 453}
 454
 455/*
 456 * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
 457 *
 458 * @priv: driver private data
 459 * @arg:  buffer handle returned by allocation routine
 460 */
 461static int rio_mport_obw_free(struct file *filp, void __user *arg)
 462{
 463	struct mport_cdev_priv *priv = filp->private_data;
 464	struct mport_dev *md = priv->md;
 465	u64 handle;
 466	struct rio_mport_mapping *map, *_map;
 467
 468	if (!md->mport->ops->unmap_outb)
 469		return -EPROTONOSUPPORT;
 470
 471	if (copy_from_user(&handle, arg, sizeof(handle)))
 472		return -EFAULT;
 473
 474	rmcd_debug(OBW, "h=0x%llx", handle);
 475
 476	mutex_lock(&md->buf_mutex);
 477	list_for_each_entry_safe(map, _map, &md->mappings, node) {
 478		if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) {
 479			if (map->filp == filp) {
 480				rmcd_debug(OBW, "kref_put h=0x%llx", handle);
 481				map->filp = NULL;
 482				kref_put(&map->ref, mport_release_mapping);
 483			}
 484			break;
 485		}
 486	}
 487	mutex_unlock(&md->buf_mutex);
 488
 489	return 0;
 490}
 491
 492/*
 493 * maint_hdid_set() - Set the host Device ID
 494 * @priv: driver private data
 495 * @arg:	Device Id
 496 */
 497static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
 498{
 499	struct mport_dev *md = priv->md;
 500	u16 hdid;
 501
 502	if (copy_from_user(&hdid, arg, sizeof(hdid)))
 503		return -EFAULT;
 504
 505	md->mport->host_deviceid = hdid;
 506	md->properties.hdid = hdid;
 507	rio_local_set_device_id(md->mport, hdid);
 508
 509	rmcd_debug(MPORT, "Set host device Id to %d", hdid);
 510
 511	return 0;
 512}
 513
 514/*
 515 * maint_comptag_set() - Set the host Component Tag
 516 * @priv: driver private data
 517 * @arg:	Component Tag
 518 */
 519static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg)
 520{
 521	struct mport_dev *md = priv->md;
 522	u32 comptag;
 523
 524	if (copy_from_user(&comptag, arg, sizeof(comptag)))
 525		return -EFAULT;
 526
 527	rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag);
 528
 529	rmcd_debug(MPORT, "Set host Component Tag to %d", comptag);
 530
 531	return 0;
 532}
 533
 534#ifdef CONFIG_RAPIDIO_DMA_ENGINE
 535
 536struct mport_dma_req {
 537	struct kref refcount;
 538	struct list_head node;
 539	struct file *filp;
 540	struct mport_cdev_priv *priv;
 541	enum rio_transfer_sync sync;
 542	struct sg_table sgt;
 543	struct page **page_list;
 544	unsigned int nr_pages;
 545	struct rio_mport_mapping *map;
 546	struct dma_chan *dmach;
 547	enum dma_data_direction dir;
 548	dma_cookie_t cookie;
 549	enum dma_status	status;
 550	struct completion req_comp;
 551};
 552
 553static void mport_release_def_dma(struct kref *dma_ref)
 554{
 555	struct mport_dev *md =
 556			container_of(dma_ref, struct mport_dev, dma_ref);
 557
 558	rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id);
 559	rio_release_dma(md->dma_chan);
 560	md->dma_chan = NULL;
 561}
 562
 563static void mport_release_dma(struct kref *dma_ref)
 564{
 565	struct mport_cdev_priv *priv =
 566			container_of(dma_ref, struct mport_cdev_priv, dma_ref);
 567
 568	rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id);
 569	complete(&priv->comp);
 570}
 571
 572static void dma_req_free(struct kref *ref)
 573{
 574	struct mport_dma_req *req = container_of(ref, struct mport_dma_req,
 575			refcount);
 576	struct mport_cdev_priv *priv = req->priv;
 577
 578	dma_unmap_sg(req->dmach->device->dev,
 579		     req->sgt.sgl, req->sgt.nents, req->dir);
 580	sg_free_table(&req->sgt);
 581	if (req->page_list) {
 582		unpin_user_pages(req->page_list, req->nr_pages);
 583		kfree(req->page_list);
 584	}
 585
 586	if (req->map) {
 587		mutex_lock(&req->map->md->buf_mutex);
 588		kref_put(&req->map->ref, mport_release_mapping);
 589		mutex_unlock(&req->map->md->buf_mutex);
 590	}
 591
 592	kref_put(&priv->dma_ref, mport_release_dma);
 593
 594	kfree(req);
 595}
 596
 597static void dma_xfer_callback(void *param)
 598{
 599	struct mport_dma_req *req = (struct mport_dma_req *)param;
 600	struct mport_cdev_priv *priv = req->priv;
 601
 602	req->status = dma_async_is_tx_complete(priv->dmach, req->cookie,
 603					       NULL, NULL);
 604	complete(&req->req_comp);
 605	kref_put(&req->refcount, dma_req_free);
 606}
 607
 608/*
 609 * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
 610 *                   transfer object.
 611 * Returns pointer to DMA transaction descriptor allocated by DMA driver on
 612 * success or ERR_PTR (and/or NULL) if failed. Caller must check returned
 613 * non-NULL pointer using IS_ERR macro.
 614 */
 615static struct dma_async_tx_descriptor
 616*prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer,
 617	struct sg_table *sgt, int nents, enum dma_transfer_direction dir,
 618	enum dma_ctrl_flags flags)
 619{
 620	struct rio_dma_data tx_data;
 621
 622	tx_data.sg = sgt->sgl;
 623	tx_data.sg_len = nents;
 624	tx_data.rio_addr_u = 0;
 625	tx_data.rio_addr = transfer->rio_addr;
 626	if (dir == DMA_MEM_TO_DEV) {
 627		switch (transfer->method) {
 628		case RIO_EXCHANGE_NWRITE:
 629			tx_data.wr_type = RDW_ALL_NWRITE;
 630			break;
 631		case RIO_EXCHANGE_NWRITE_R_ALL:
 632			tx_data.wr_type = RDW_ALL_NWRITE_R;
 633			break;
 634		case RIO_EXCHANGE_NWRITE_R:
 635			tx_data.wr_type = RDW_LAST_NWRITE_R;
 636			break;
 637		case RIO_EXCHANGE_DEFAULT:
 638			tx_data.wr_type = RDW_DEFAULT;
 639			break;
 640		default:
 641			return ERR_PTR(-EINVAL);
 642		}
 643	}
 644
 645	return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags);
 646}
 647
 648/* Request DMA channel associated with this mport device.
 649 * Try to request DMA channel for every new process that opened given
 650 * mport. If a new DMA channel is not available use default channel
 651 * which is the first DMA channel opened on mport device.
 652 */
 653static int get_dma_channel(struct mport_cdev_priv *priv)
 654{
 655	mutex_lock(&priv->dma_lock);
 656	if (!priv->dmach) {
 657		priv->dmach = rio_request_mport_dma(priv->md->mport);
 658		if (!priv->dmach) {
 659			/* Use default DMA channel if available */
 660			if (priv->md->dma_chan) {
 661				priv->dmach = priv->md->dma_chan;
 662				kref_get(&priv->md->dma_ref);
 663			} else {
 664				rmcd_error("Failed to get DMA channel");
 665				mutex_unlock(&priv->dma_lock);
 666				return -ENODEV;
 667			}
 668		} else if (!priv->md->dma_chan) {
 669			/* Register default DMA channel if we do not have one */
 670			priv->md->dma_chan = priv->dmach;
 671			kref_init(&priv->md->dma_ref);
 672			rmcd_debug(DMA, "Register DMA_chan %d as default",
 673				   priv->dmach->chan_id);
 674		}
 675
 676		kref_init(&priv->dma_ref);
 677		init_completion(&priv->comp);
 678	}
 679
 680	kref_get(&priv->dma_ref);
 681	mutex_unlock(&priv->dma_lock);
 682	return 0;
 683}
 684
 685static void put_dma_channel(struct mport_cdev_priv *priv)
 686{
 687	kref_put(&priv->dma_ref, mport_release_dma);
 688}
 689
 690/*
 691 * DMA transfer functions
 692 */
 693static int do_dma_request(struct mport_dma_req *req,
 694			  struct rio_transfer_io *xfer,
 695			  enum rio_transfer_sync sync, int nents)
 696{
 697	struct mport_cdev_priv *priv;
 698	struct sg_table *sgt;
 699	struct dma_chan *chan;
 700	struct dma_async_tx_descriptor *tx;
 701	dma_cookie_t cookie;
 702	unsigned long tmo = msecs_to_jiffies(dma_timeout);
 703	enum dma_transfer_direction dir;
 704	long wret;
 705	int ret = 0;
 706
 707	priv = req->priv;
 708	sgt = &req->sgt;
 709
 710	chan = priv->dmach;
 711	dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;
 712
 713	rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s",
 714		   current->comm, task_pid_nr(current),
 715		   dev_name(&chan->dev->device),
 716		   (dir == DMA_DEV_TO_MEM)?"READ":"WRITE");
 717
 718	/* Initialize DMA transaction request */
 719	tx = prep_dma_xfer(chan, xfer, sgt, nents, dir,
 720			   DMA_CTRL_ACK | DMA_PREP_INTERRUPT);
 721
 722	if (!tx) {
 723		rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx",
 724			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
 725			xfer->rio_addr, xfer->length);
 726		ret = -EIO;
 727		goto err_out;
 728	} else if (IS_ERR(tx)) {
 729		ret = PTR_ERR(tx);
 730		rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret,
 731			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
 732			xfer->rio_addr, xfer->length);
 733		goto err_out;
 734	}
 735
 736	tx->callback = dma_xfer_callback;
 737	tx->callback_param = req;
 738
 739	req->status = DMA_IN_PROGRESS;
 740	kref_get(&req->refcount);
 741
 742	cookie = dmaengine_submit(tx);
 743	req->cookie = cookie;
 744
 745	rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current),
 746		   (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
 747
 748	if (dma_submit_error(cookie)) {
 749		rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)",
 750			   cookie, xfer->rio_addr, xfer->length);
 751		kref_put(&req->refcount, dma_req_free);
 752		ret = -EIO;
 753		goto err_out;
 754	}
 755
 756	dma_async_issue_pending(chan);
 757
 758	if (sync == RIO_TRANSFER_ASYNC) {
 759		spin_lock(&priv->req_lock);
 760		list_add_tail(&req->node, &priv->async_list);
 761		spin_unlock(&priv->req_lock);
 762		return cookie;
 763	} else if (sync == RIO_TRANSFER_FAF)
 764		return 0;
 765
 766	wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
 767
 768	if (wret == 0) {
 769		/* Timeout on wait occurred */
 770		rmcd_error("%s(%d) timed out waiting for DMA_%s %d",
 771		       current->comm, task_pid_nr(current),
 772		       (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
 773		return -ETIMEDOUT;
 774	} else if (wret == -ERESTARTSYS) {
 775		/* Wait_for_completion was interrupted by a signal but DMA may
 776		 * be in progress
 777		 */
 778		rmcd_error("%s(%d) wait for DMA_%s %d was interrupted",
 779			current->comm, task_pid_nr(current),
 780			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
 781		return -EINTR;
 782	}
 783
 784	if (req->status != DMA_COMPLETE) {
 785		/* DMA transaction completion was signaled with error */
 786		rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)",
 787			current->comm, task_pid_nr(current),
 788			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
 789			cookie, req->status, ret);
 790		ret = -EIO;
 791	}
 792
 793err_out:
 794	return ret;
 795}
 796
 797/*
 798 * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from
 799 *                      the remote RapidIO device
 800 * @filp: file pointer associated with the call
 801 * @transfer_mode: DMA transfer mode
 802 * @sync: synchronization mode
 803 * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR
 804 *                               DMA_DEV_TO_MEM = read)
 805 * @xfer: data transfer descriptor structure
 806 */
 807static int
 808rio_dma_transfer(struct file *filp, u32 transfer_mode,
 809		 enum rio_transfer_sync sync, enum dma_data_direction dir,
 810		 struct rio_transfer_io *xfer)
 811{
 812	struct mport_cdev_priv *priv = filp->private_data;
 813	unsigned long nr_pages = 0;
 814	struct page **page_list = NULL;
 815	struct mport_dma_req *req;
 816	struct mport_dev *md = priv->md;
 817	struct dma_chan *chan;
 818	int ret;
 819	int nents;
 820
 821	if (xfer->length == 0)
 822		return -EINVAL;
 823	req = kzalloc(sizeof(*req), GFP_KERNEL);
 824	if (!req)
 825		return -ENOMEM;
 826
 827	ret = get_dma_channel(priv);
 828	if (ret) {
 829		kfree(req);
 830		return ret;
 831	}
 832	chan = priv->dmach;
 833
 834	kref_init(&req->refcount);
 835	init_completion(&req->req_comp);
 836	req->dir = dir;
 837	req->filp = filp;
 838	req->priv = priv;
 839	req->dmach = chan;
 840	req->sync = sync;
 841
 842	/*
 843	 * If parameter loc_addr != NULL, we are transferring data from/to
 844	 * data buffer allocated in user-space: lock in memory user-space
 845	 * buffer pages and build an SG table for DMA transfer request
 846	 *
 847	 * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is
 848	 * used for DMA data transfers: build single entry SG table using
 849	 * offset within the internal buffer specified by handle parameter.
 850	 */
 851	if (xfer->loc_addr) {
 852		unsigned int offset;
 853		long pinned;
 854
 855		offset = lower_32_bits(offset_in_page(xfer->loc_addr));
 856		nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;
 857
 858		page_list = kmalloc_array(nr_pages,
 859					  sizeof(*page_list), GFP_KERNEL);
 860		if (page_list == NULL) {
 861			ret = -ENOMEM;
 862			goto err_req;
 863		}
 864
 865		pinned = pin_user_pages_fast(
 866				(unsigned long)xfer->loc_addr & PAGE_MASK,
 867				nr_pages,
 868				dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
 869				page_list);
 870
 871		if (pinned != nr_pages) {
 872			if (pinned < 0) {
 873				rmcd_error("pin_user_pages_fast err=%ld",
 874					   pinned);
 875				nr_pages = 0;
 876			} else {
 877				rmcd_error("pinned %ld out of %ld pages",
 878					   pinned, nr_pages);
 879				/*
 880				 * Set nr_pages up to mean "how many pages to unpin, in
 881				 * the error handler:
 882				 */
 883				nr_pages = pinned;
 884			}
 885			ret = -EFAULT;
 
 
 
 
 
 886			goto err_pg;
 887		}
 888
 889		ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
 890					offset, xfer->length, GFP_KERNEL);
 891		if (ret) {
 892			rmcd_error("sg_alloc_table failed with err=%d", ret);
 893			goto err_pg;
 894		}
 895
 896		req->page_list = page_list;
 897		req->nr_pages = nr_pages;
 898	} else {
 899		dma_addr_t baddr;
 900		struct rio_mport_mapping *map;
 901
 902		baddr = (dma_addr_t)xfer->handle;
 903
 904		mutex_lock(&md->buf_mutex);
 905		list_for_each_entry(map, &md->mappings, node) {
 906			if (baddr >= map->phys_addr &&
 907			    baddr < (map->phys_addr + map->size)) {
 908				kref_get(&map->ref);
 909				req->map = map;
 910				break;
 911			}
 912		}
 913		mutex_unlock(&md->buf_mutex);
 914
 915		if (req->map == NULL) {
 916			ret = -ENOMEM;
 917			goto err_req;
 918		}
 919
 920		if (xfer->length + xfer->offset > req->map->size) {
 921			ret = -EINVAL;
 922			goto err_req;
 923		}
 924
 925		ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
 926		if (unlikely(ret)) {
 927			rmcd_error("sg_alloc_table failed for internal buf");
 928			goto err_req;
 929		}
 930
 931		sg_set_buf(req->sgt.sgl,
 932			   req->map->virt_addr + (baddr - req->map->phys_addr) +
 933				xfer->offset, xfer->length);
 934	}
 935
 936	nents = dma_map_sg(chan->device->dev,
 937			   req->sgt.sgl, req->sgt.nents, dir);
 938	if (nents == 0) {
 939		rmcd_error("Failed to map SG list");
 940		ret = -EFAULT;
 941		goto err_pg;
 942	}
 943
 944	ret = do_dma_request(req, xfer, sync, nents);
 945
 946	if (ret >= 0) {
 947		if (sync == RIO_TRANSFER_ASYNC)
 948			return ret; /* return ASYNC cookie */
 949	} else {
 950		rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
 951	}
 952
 953err_pg:
 954	if (!req->page_list) {
 955		unpin_user_pages(page_list, nr_pages);
 956		kfree(page_list);
 957	}
 958err_req:
 959	kref_put(&req->refcount, dma_req_free);
 960	return ret;
 961}
 962
 963static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
 964{
 965	struct mport_cdev_priv *priv = filp->private_data;
 966	struct rio_transaction transaction;
 967	struct rio_transfer_io *transfer;
 968	enum dma_data_direction dir;
 969	int i, ret = 0;
 970	size_t size;
 971
 972	if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
 973		return -EFAULT;
 974
 975	if (transaction.count != 1) /* only single transfer for now */
 976		return -EINVAL;
 977
 978	if ((transaction.transfer_mode &
 979	     priv->md->properties.transfer_mode) == 0)
 980		return -ENODEV;
 981
 982	size = array_size(sizeof(*transfer), transaction.count);
 983	transfer = vmalloc(size);
 984	if (!transfer)
 985		return -ENOMEM;
 986
 987	if (unlikely(copy_from_user(transfer,
 988				    (void __user *)(uintptr_t)transaction.block,
 989				    size))) {
 990		ret = -EFAULT;
 991		goto out_free;
 992	}
 993
 994	dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
 995					DMA_FROM_DEVICE : DMA_TO_DEVICE;
 996	for (i = 0; i < transaction.count && ret == 0; i++)
 997		ret = rio_dma_transfer(filp, transaction.transfer_mode,
 998			transaction.sync, dir, &transfer[i]);
 999
1000	if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
1001				  transfer, size)))
 
1002		ret = -EFAULT;
1003
1004out_free:
1005	vfree(transfer);
1006
1007	return ret;
1008}
1009
1010static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1011{
1012	struct mport_cdev_priv *priv;
1013	struct rio_async_tx_wait w_param;
1014	struct mport_dma_req *req;
1015	dma_cookie_t cookie;
1016	unsigned long tmo;
1017	long wret;
1018	int found = 0;
1019	int ret;
1020
1021	priv = (struct mport_cdev_priv *)filp->private_data;
1022
1023	if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
1024		return -EFAULT;
1025
1026	cookie = w_param.token;
1027	if (w_param.timeout)
1028		tmo = msecs_to_jiffies(w_param.timeout);
1029	else /* Use default DMA timeout */
1030		tmo = msecs_to_jiffies(dma_timeout);
1031
1032	spin_lock(&priv->req_lock);
1033	list_for_each_entry(req, &priv->async_list, node) {
1034		if (req->cookie == cookie) {
1035			list_del(&req->node);
1036			found = 1;
1037			break;
1038		}
1039	}
1040	spin_unlock(&priv->req_lock);
1041
1042	if (!found)
1043		return -EAGAIN;
1044
1045	wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);
1046
1047	if (wret == 0) {
1048		/* Timeout on wait occurred */
1049		rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
1050		       current->comm, task_pid_nr(current),
1051		       (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1052		ret = -ETIMEDOUT;
1053		goto err_tmo;
1054	} else if (wret == -ERESTARTSYS) {
1055		/* Wait_for_completion was interrupted by a signal but DMA may
1056		 * be still in progress
1057		 */
1058		rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
1059			current->comm, task_pid_nr(current),
1060			(req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
1061		ret = -EINTR;
1062		goto err_tmo;
1063	}
1064
1065	if (req->status != DMA_COMPLETE) {
1066		/* DMA transaction completion signaled with transfer error */
1067		rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
1068			current->comm, task_pid_nr(current),
1069			(req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
1070			req->status);
1071		ret = -EIO;
1072	} else
1073		ret = 0;
1074
1075	if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1076		kref_put(&req->refcount, dma_req_free);
1077
1078	return ret;
1079
1080err_tmo:
1081	/* Return request back into async queue */
1082	spin_lock(&priv->req_lock);
1083	list_add_tail(&req->node, &priv->async_list);
1084	spin_unlock(&priv->req_lock);
1085	return ret;
1086}
1087
1088static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1089			u64 size, struct rio_mport_mapping **mapping)
1090{
1091	struct rio_mport_mapping *map;
1092
1093	map = kzalloc(sizeof(*map), GFP_KERNEL);
1094	if (map == NULL)
1095		return -ENOMEM;
1096
1097	map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
1098					    &map->phys_addr, GFP_KERNEL);
1099	if (map->virt_addr == NULL) {
1100		kfree(map);
1101		return -ENOMEM;
1102	}
1103
1104	map->dir = MAP_DMA;
1105	map->size = size;
1106	map->filp = filp;
1107	map->md = md;
1108	kref_init(&map->ref);
1109	mutex_lock(&md->buf_mutex);
1110	list_add_tail(&map->node, &md->mappings);
1111	mutex_unlock(&md->buf_mutex);
1112	*mapping = map;
1113
1114	return 0;
1115}
1116
1117static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1118{
1119	struct mport_cdev_priv *priv = filp->private_data;
1120	struct mport_dev *md = priv->md;
1121	struct rio_dma_mem map;
1122	struct rio_mport_mapping *mapping = NULL;
1123	int ret;
1124
1125	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1126		return -EFAULT;
1127
1128	ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
1129	if (ret)
1130		return ret;
1131
1132	map.dma_handle = mapping->phys_addr;
1133
1134	if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1135		mutex_lock(&md->buf_mutex);
1136		kref_put(&mapping->ref, mport_release_mapping);
1137		mutex_unlock(&md->buf_mutex);
1138		return -EFAULT;
1139	}
1140
1141	return 0;
1142}
1143
1144static int rio_mport_free_dma(struct file *filp, void __user *arg)
1145{
1146	struct mport_cdev_priv *priv = filp->private_data;
1147	struct mport_dev *md = priv->md;
1148	u64 handle;
1149	int ret = -EFAULT;
1150	struct rio_mport_mapping *map, *_map;
1151
1152	if (copy_from_user(&handle, arg, sizeof(handle)))
1153		return -EFAULT;
1154	rmcd_debug(EXIT, "filp=%p", filp);
1155
1156	mutex_lock(&md->buf_mutex);
1157	list_for_each_entry_safe(map, _map, &md->mappings, node) {
1158		if (map->dir == MAP_DMA && map->phys_addr == handle &&
1159		    map->filp == filp) {
1160			kref_put(&map->ref, mport_release_mapping);
1161			ret = 0;
1162			break;
1163		}
1164	}
1165	mutex_unlock(&md->buf_mutex);
1166
1167	if (ret == -EFAULT) {
1168		rmcd_debug(DMA, "ERR no matching mapping");
1169		return ret;
1170	}
1171
1172	return 0;
1173}
1174#else
1175static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
1176{
1177	return -ENODEV;
1178}
1179
1180static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
1181{
1182	return -ENODEV;
1183}
1184
1185static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
1186{
1187	return -ENODEV;
1188}
1189
1190static int rio_mport_free_dma(struct file *filp, void __user *arg)
1191{
1192	return -ENODEV;
1193}
1194#endif /* CONFIG_RAPIDIO_DMA_ENGINE */
1195
1196/*
1197 * Inbound/outbound memory mapping functions
1198 */
1199
1200static int
1201rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1202				u64 raddr, u64 size,
1203				struct rio_mport_mapping **mapping)
1204{
1205	struct rio_mport *mport = md->mport;
1206	struct rio_mport_mapping *map;
1207	int ret;
1208
1209	/* rio_map_inb_region() accepts u32 size */
1210	if (size > 0xffffffff)
1211		return -EINVAL;
1212
1213	map = kzalloc(sizeof(*map), GFP_KERNEL);
1214	if (map == NULL)
1215		return -ENOMEM;
1216
1217	map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
1218					    &map->phys_addr, GFP_KERNEL);
1219	if (map->virt_addr == NULL) {
1220		ret = -ENOMEM;
1221		goto err_dma_alloc;
1222	}
1223
1224	if (raddr == RIO_MAP_ANY_ADDR)
1225		raddr = map->phys_addr;
1226	ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1227	if (ret < 0)
1228		goto err_map_inb;
1229
1230	map->dir = MAP_INBOUND;
1231	map->rio_addr = raddr;
1232	map->size = size;
1233	map->filp = filp;
1234	map->md = md;
1235	kref_init(&map->ref);
1236	mutex_lock(&md->buf_mutex);
1237	list_add_tail(&map->node, &md->mappings);
1238	mutex_unlock(&md->buf_mutex);
1239	*mapping = map;
1240	return 0;
1241
1242err_map_inb:
1243	dma_free_coherent(mport->dev.parent, size,
1244			  map->virt_addr, map->phys_addr);
1245err_dma_alloc:
1246	kfree(map);
1247	return ret;
1248}
1249
1250static int
1251rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1252			      u64 raddr, u64 size,
1253			      struct rio_mport_mapping **mapping)
1254{
1255	struct rio_mport_mapping *map;
1256	int err = -ENOMEM;
1257
1258	if (raddr == RIO_MAP_ANY_ADDR)
1259		goto get_new;
1260
1261	mutex_lock(&md->buf_mutex);
1262	list_for_each_entry(map, &md->mappings, node) {
1263		if (map->dir != MAP_INBOUND)
1264			continue;
1265		if (raddr == map->rio_addr && size == map->size) {
1266			/* allow exact match only */
1267			*mapping = map;
1268			err = 0;
1269			break;
1270		} else if (raddr < (map->rio_addr + map->size - 1) &&
1271			   (raddr + size) > map->rio_addr) {
1272			err = -EBUSY;
1273			break;
1274		}
1275	}
1276	mutex_unlock(&md->buf_mutex);
1277
1278	if (err != -ENOMEM)
1279		return err;
1280get_new:
1281	/* not found, create new */
1282	return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
1283}
1284
1285static int rio_mport_map_inbound(struct file *filp, void __user *arg)
1286{
1287	struct mport_cdev_priv *priv = filp->private_data;
1288	struct mport_dev *md = priv->md;
1289	struct rio_mmap map;
1290	struct rio_mport_mapping *mapping = NULL;
1291	int ret;
1292
1293	if (!md->mport->ops->map_inb)
1294		return -EPROTONOSUPPORT;
1295	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1296		return -EFAULT;
1297
1298	rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1299
1300	ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
1301					    map.length, &mapping);
1302	if (ret)
1303		return ret;
1304
1305	map.handle = mapping->phys_addr;
1306	map.rio_addr = mapping->rio_addr;
1307
1308	if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1309		/* Delete mapping if it was created by this request */
1310		if (ret == 0 && mapping->filp == filp) {
1311			mutex_lock(&md->buf_mutex);
1312			kref_put(&mapping->ref, mport_release_mapping);
1313			mutex_unlock(&md->buf_mutex);
1314		}
1315		return -EFAULT;
1316	}
1317
1318	return 0;
1319}
1320
1321/*
1322 * rio_mport_inbound_free() - unmap from RapidIO address space and free
1323 *                    previously allocated inbound DMA coherent buffer
1324 * @priv: driver private data
1325 * @arg:  buffer handle returned by allocation routine
1326 */
1327static int rio_mport_inbound_free(struct file *filp, void __user *arg)
1328{
1329	struct mport_cdev_priv *priv = filp->private_data;
1330	struct mport_dev *md = priv->md;
1331	u64 handle;
1332	struct rio_mport_mapping *map, *_map;
1333
1334	rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);
1335
1336	if (!md->mport->ops->unmap_inb)
1337		return -EPROTONOSUPPORT;
1338
1339	if (copy_from_user(&handle, arg, sizeof(handle)))
1340		return -EFAULT;
1341
1342	mutex_lock(&md->buf_mutex);
1343	list_for_each_entry_safe(map, _map, &md->mappings, node) {
1344		if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
1345			if (map->filp == filp) {
1346				map->filp = NULL;
1347				kref_put(&map->ref, mport_release_mapping);
1348			}
1349			break;
1350		}
1351	}
1352	mutex_unlock(&md->buf_mutex);
1353
1354	return 0;
1355}
1356
1357/*
1358 * maint_port_idx_get() - Get the port index of the mport instance
1359 * @priv: driver private data
1360 * @arg:  port index
1361 */
1362static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
1363{
1364	struct mport_dev *md = priv->md;
1365	u32 port_idx = md->mport->index;
1366
1367	rmcd_debug(MPORT, "port_index=%d", port_idx);
1368
1369	if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
1370		return -EFAULT;
1371
1372	return 0;
1373}
1374
1375static int rio_mport_add_event(struct mport_cdev_priv *priv,
1376			       struct rio_event *event)
1377{
1378	int overflow;
1379
1380	if (!(priv->event_mask & event->header))
1381		return -EACCES;
1382
1383	spin_lock(&priv->fifo_lock);
1384	overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
1385		|| kfifo_in(&priv->event_fifo, (unsigned char *)event,
1386			sizeof(*event)) != sizeof(*event);
1387	spin_unlock(&priv->fifo_lock);
1388
1389	wake_up_interruptible(&priv->event_rx_wait);
1390
1391	if (overflow) {
1392		dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
1393		return -EBUSY;
1394	}
1395
1396	return 0;
1397}
1398
1399static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
1400				       u16 src, u16 dst, u16 info)
1401{
1402	struct mport_dev *data = dev_id;
1403	struct mport_cdev_priv *priv;
1404	struct rio_mport_db_filter *db_filter;
1405	struct rio_event event;
1406	int handled;
1407
1408	event.header = RIO_DOORBELL;
1409	event.u.doorbell.rioid = src;
1410	event.u.doorbell.payload = info;
1411
1412	handled = 0;
1413	spin_lock(&data->db_lock);
1414	list_for_each_entry(db_filter, &data->doorbells, data_node) {
1415		if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1416		      db_filter->filter.rioid == src)) &&
1417		      info >= db_filter->filter.low &&
1418		      info <= db_filter->filter.high) {
1419			priv = db_filter->priv;
1420			rio_mport_add_event(priv, &event);
1421			handled = 1;
1422		}
1423	}
1424	spin_unlock(&data->db_lock);
1425
1426	if (!handled)
1427		dev_warn(&data->dev,
1428			"%s: spurious DB received from 0x%x, info=0x%04x\n",
1429			__func__, src, info);
1430}
1431
1432static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
1433				   void __user *arg)
1434{
1435	struct mport_dev *md = priv->md;
1436	struct rio_mport_db_filter *db_filter;
1437	struct rio_doorbell_filter filter;
1438	unsigned long flags;
1439	int ret;
1440
1441	if (copy_from_user(&filter, arg, sizeof(filter)))
1442		return -EFAULT;
1443
1444	if (filter.low > filter.high)
1445		return -EINVAL;
1446
1447	ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
1448				    rio_mport_doorbell_handler);
1449	if (ret) {
1450		rmcd_error("%s failed to register IBDB, err=%d",
1451			   dev_name(&md->dev), ret);
1452		return ret;
1453	}
1454
1455	db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
1456	if (db_filter == NULL) {
1457		rio_release_inb_dbell(md->mport, filter.low, filter.high);
1458		return -ENOMEM;
1459	}
1460
1461	db_filter->filter = filter;
1462	db_filter->priv = priv;
1463	spin_lock_irqsave(&md->db_lock, flags);
1464	list_add_tail(&db_filter->priv_node, &priv->db_filters);
1465	list_add_tail(&db_filter->data_node, &md->doorbells);
1466	spin_unlock_irqrestore(&md->db_lock, flags);
1467
1468	return 0;
1469}
1470
1471static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
1472{
1473	list_del(&db_filter->data_node);
1474	list_del(&db_filter->priv_node);
1475	kfree(db_filter);
1476}
1477
1478static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
1479				      void __user *arg)
1480{
1481	struct rio_mport_db_filter *db_filter;
1482	struct rio_doorbell_filter filter;
1483	unsigned long flags;
1484	int ret = -EINVAL;
1485
1486	if (copy_from_user(&filter, arg, sizeof(filter)))
1487		return -EFAULT;
1488
1489	if (filter.low > filter.high)
1490		return -EINVAL;
1491
1492	spin_lock_irqsave(&priv->md->db_lock, flags);
1493	list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
1494		if (db_filter->filter.rioid == filter.rioid &&
1495		    db_filter->filter.low == filter.low &&
1496		    db_filter->filter.high == filter.high) {
1497			rio_mport_delete_db_filter(db_filter);
1498			ret = 0;
1499			break;
1500		}
1501	}
1502	spin_unlock_irqrestore(&priv->md->db_lock, flags);
1503
1504	if (!ret)
1505		rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);
1506
1507	return ret;
1508}
1509
1510static int rio_mport_match_pw(union rio_pw_msg *msg,
1511			      struct rio_pw_filter *filter)
1512{
1513	if ((msg->em.comptag & filter->mask) < filter->low ||
1514		(msg->em.comptag & filter->mask) > filter->high)
1515		return 0;
1516	return 1;
1517}
1518
1519static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
1520				union rio_pw_msg *msg, int step)
1521{
1522	struct mport_dev *md = context;
1523	struct mport_cdev_priv *priv;
1524	struct rio_mport_pw_filter *pw_filter;
1525	struct rio_event event;
1526	int handled;
1527
1528	event.header = RIO_PORTWRITE;
1529	memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);
1530
1531	handled = 0;
1532	spin_lock(&md->pw_lock);
1533	list_for_each_entry(pw_filter, &md->portwrites, md_node) {
1534		if (rio_mport_match_pw(msg, &pw_filter->filter)) {
1535			priv = pw_filter->priv;
1536			rio_mport_add_event(priv, &event);
1537			handled = 1;
1538		}
1539	}
1540	spin_unlock(&md->pw_lock);
1541
1542	if (!handled) {
1543		printk_ratelimited(KERN_WARNING DRV_NAME
1544			": mport%d received spurious PW from 0x%08x\n",
1545			mport->id, msg->em.comptag);
1546	}
1547
1548	return 0;
1549}
1550
1551static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
1552				   void __user *arg)
1553{
1554	struct mport_dev *md = priv->md;
1555	struct rio_mport_pw_filter *pw_filter;
1556	struct rio_pw_filter filter;
1557	unsigned long flags;
1558	int hadd = 0;
1559
1560	if (copy_from_user(&filter, arg, sizeof(filter)))
1561		return -EFAULT;
1562
1563	pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
1564	if (pw_filter == NULL)
1565		return -ENOMEM;
1566
1567	pw_filter->filter = filter;
1568	pw_filter->priv = priv;
1569	spin_lock_irqsave(&md->pw_lock, flags);
1570	if (list_empty(&md->portwrites))
1571		hadd = 1;
1572	list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
1573	list_add_tail(&pw_filter->md_node, &md->portwrites);
1574	spin_unlock_irqrestore(&md->pw_lock, flags);
1575
1576	if (hadd) {
1577		int ret;
1578
1579		ret = rio_add_mport_pw_handler(md->mport, md,
1580					       rio_mport_pw_handler);
1581		if (ret) {
1582			dev_err(&md->dev,
1583				"%s: failed to add IB_PW handler, err=%d\n",
1584				__func__, ret);
1585			return ret;
1586		}
1587		rio_pw_enable(md->mport, 1);
1588	}
1589
1590	return 0;
1591}
1592
1593static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
1594{
1595	list_del(&pw_filter->md_node);
1596	list_del(&pw_filter->priv_node);
1597	kfree(pw_filter);
1598}
1599
1600static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
1601				     struct rio_pw_filter *b)
1602{
1603	if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
1604		return 1;
1605	return 0;
1606}
1607
1608static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
1609				      void __user *arg)
1610{
1611	struct mport_dev *md = priv->md;
1612	struct rio_mport_pw_filter *pw_filter;
1613	struct rio_pw_filter filter;
1614	unsigned long flags;
1615	int ret = -EINVAL;
1616	int hdel = 0;
1617
1618	if (copy_from_user(&filter, arg, sizeof(filter)))
1619		return -EFAULT;
1620
1621	spin_lock_irqsave(&md->pw_lock, flags);
1622	list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
1623		if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
1624			rio_mport_delete_pw_filter(pw_filter);
1625			ret = 0;
1626			break;
1627		}
1628	}
1629
1630	if (list_empty(&md->portwrites))
1631		hdel = 1;
1632	spin_unlock_irqrestore(&md->pw_lock, flags);
1633
1634	if (hdel) {
1635		rio_del_mport_pw_handler(md->mport, priv->md,
1636					 rio_mport_pw_handler);
1637		rio_pw_enable(md->mport, 0);
1638	}
1639
1640	return ret;
1641}
1642
1643/*
1644 * rio_release_dev - release routine for kernel RIO device object
1645 * @dev: kernel device object associated with a RIO device structure
1646 *
1647 * Frees a RIO device struct associated a RIO device struct.
1648 * The RIO device struct is freed.
1649 */
1650static void rio_release_dev(struct device *dev)
1651{
1652	struct rio_dev *rdev;
1653
1654	rdev = to_rio_dev(dev);
1655	pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
1656	kfree(rdev);
1657}
1658
1659
1660static void rio_release_net(struct device *dev)
1661{
1662	struct rio_net *net;
1663
1664	net = to_rio_net(dev);
1665	rmcd_debug(RDEV, "net_%d", net->id);
1666	kfree(net);
1667}
1668
1669
1670/*
1671 * rio_mport_add_riodev - creates a kernel RIO device object
1672 *
1673 * Allocates a RIO device data structure and initializes required fields based
1674 * on device's configuration space contents.
1675 * If the device has switch capabilities, then a switch specific portion is
1676 * allocated and configured.
1677 */
1678static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
1679				   void __user *arg)
1680{
1681	struct mport_dev *md = priv->md;
1682	struct rio_rdev_info dev_info;
1683	struct rio_dev *rdev;
1684	struct rio_switch *rswitch = NULL;
1685	struct rio_mport *mport;
1686	struct device *dev;
1687	size_t size;
1688	u32 rval;
1689	u32 swpinfo = 0;
1690	u16 destid;
1691	u8 hopcount;
1692	int err;
1693
1694	if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1695		return -EFAULT;
1696	dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1697
1698	rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
1699		   dev_info.comptag, dev_info.destid, dev_info.hopcount);
1700
1701	dev = bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name);
1702	if (dev) {
1703		rmcd_debug(RDEV, "device %s already exists", dev_info.name);
1704		put_device(dev);
1705		return -EEXIST;
1706	}
1707
1708	size = sizeof(*rdev);
1709	mport = md->mport;
1710	destid = dev_info.destid;
1711	hopcount = dev_info.hopcount;
1712
1713	if (rio_mport_read_config_32(mport, destid, hopcount,
1714				     RIO_PEF_CAR, &rval))
1715		return -EIO;
1716
1717	if (rval & RIO_PEF_SWITCH) {
1718		rio_mport_read_config_32(mport, destid, hopcount,
1719					 RIO_SWP_INFO_CAR, &swpinfo);
1720		size += struct_size(rswitch, nextdev, RIO_GET_TOTAL_PORTS(swpinfo));
1721	}
1722
1723	rdev = kzalloc(size, GFP_KERNEL);
1724	if (rdev == NULL)
1725		return -ENOMEM;
1726
1727	if (mport->net == NULL) {
1728		struct rio_net *net;
1729
1730		net = rio_alloc_net(mport);
1731		if (!net) {
1732			err = -ENOMEM;
1733			rmcd_debug(RDEV, "failed to allocate net object");
1734			goto cleanup;
1735		}
1736
1737		net->id = mport->id;
1738		net->hport = mport;
1739		dev_set_name(&net->dev, "rnet_%d", net->id);
1740		net->dev.parent = &mport->dev;
1741		net->dev.release = rio_release_net;
1742		err = rio_add_net(net);
1743		if (err) {
1744			rmcd_debug(RDEV, "failed to register net, err=%d", err);
1745			kfree(net);
1746			goto cleanup;
1747		}
1748	}
1749
1750	rdev->net = mport->net;
1751	rdev->pef = rval;
1752	rdev->swpinfo = swpinfo;
1753	rio_mport_read_config_32(mport, destid, hopcount,
1754				 RIO_DEV_ID_CAR, &rval);
1755	rdev->did = rval >> 16;
1756	rdev->vid = rval & 0xffff;
1757	rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
1758				 &rdev->device_rev);
1759	rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
1760				 &rval);
1761	rdev->asm_did = rval >> 16;
1762	rdev->asm_vid = rval & 0xffff;
1763	rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
1764				 &rval);
1765	rdev->asm_rev = rval >> 16;
1766
1767	if (rdev->pef & RIO_PEF_EXT_FEATURES) {
1768		rdev->efptr = rval & 0xffff;
1769		rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1770						hopcount, &rdev->phys_rmap);
1771
1772		rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
1773						hopcount, RIO_EFB_ERR_MGMNT);
1774	}
1775
1776	rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
1777				 &rdev->src_ops);
1778	rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
1779				 &rdev->dst_ops);
1780
1781	rdev->comp_tag = dev_info.comptag;
1782	rdev->destid = destid;
1783	/* hopcount is stored as specified by a caller, regardles of EP or SW */
1784	rdev->hopcount = hopcount;
1785
1786	if (rdev->pef & RIO_PEF_SWITCH) {
1787		rswitch = rdev->rswitch;
1788		rswitch->route_table = NULL;
1789	}
1790
1791	if (strlen(dev_info.name))
1792		dev_set_name(&rdev->dev, "%s", dev_info.name);
1793	else if (rdev->pef & RIO_PEF_SWITCH)
1794		dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
1795			     rdev->comp_tag & RIO_CTAG_UDEVID);
1796	else
1797		dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
1798			     rdev->comp_tag & RIO_CTAG_UDEVID);
1799
1800	INIT_LIST_HEAD(&rdev->net_list);
1801	rdev->dev.parent = &mport->net->dev;
1802	rio_attach_device(rdev);
1803	rdev->dev.release = rio_release_dev;
1804
1805	if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
1806		rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
1807				   0, 0xffff);
1808	err = rio_add_device(rdev);
1809	if (err) {
1810		put_device(&rdev->dev);
1811		return err;
1812	}
1813
1814	rio_dev_get(rdev);
1815
1816	return 0;
1817cleanup:
1818	kfree(rdev);
1819	return err;
1820}
1821
1822static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
1823{
1824	struct rio_rdev_info dev_info;
1825	struct rio_dev *rdev = NULL;
1826	struct device  *dev;
1827	struct rio_mport *mport;
1828	struct rio_net *net;
1829
1830	if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
1831		return -EFAULT;
1832	dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1833
1834	mport = priv->md->mport;
1835
1836	/* If device name is specified, removal by name has priority */
1837	if (strlen(dev_info.name)) {
1838		dev = bus_find_device_by_name(&rio_bus_type, NULL,
1839					      dev_info.name);
1840		if (dev)
1841			rdev = to_rio_dev(dev);
1842	} else {
1843		do {
1844			rdev = rio_get_comptag(dev_info.comptag, rdev);
1845			if (rdev && rdev->dev.parent == &mport->net->dev &&
1846			    rdev->destid == dev_info.destid &&
1847			    rdev->hopcount == dev_info.hopcount)
1848				break;
1849		} while (rdev);
1850	}
1851
1852	if (!rdev) {
1853		rmcd_debug(RDEV,
1854			"device name:%s ct:0x%x did:0x%x hc:0x%x not found",
1855			dev_info.name, dev_info.comptag, dev_info.destid,
1856			dev_info.hopcount);
1857		return -ENODEV;
1858	}
1859
1860	net = rdev->net;
1861	rio_dev_put(rdev);
1862	rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);
1863
1864	if (list_empty(&net->devices)) {
1865		rio_free_net(net);
1866		mport->net = NULL;
1867	}
1868
1869	return 0;
1870}
1871
1872/*
1873 * Mport cdev management
1874 */
1875
1876/*
1877 * mport_cdev_open() - Open character device (mport)
1878 */
1879static int mport_cdev_open(struct inode *inode, struct file *filp)
1880{
1881	int ret;
1882	int minor = iminor(inode);
1883	struct mport_dev *chdev;
1884	struct mport_cdev_priv *priv;
1885
1886	/* Test for valid device */
1887	if (minor >= RIO_MAX_MPORTS) {
1888		rmcd_error("Invalid minor device number");
1889		return -EINVAL;
1890	}
1891
1892	chdev = container_of(inode->i_cdev, struct mport_dev, cdev);
1893
1894	rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);
1895
1896	if (atomic_read(&chdev->active) == 0)
1897		return -ENODEV;
1898
1899	get_device(&chdev->dev);
1900
1901	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1902	if (!priv) {
1903		put_device(&chdev->dev);
1904		return -ENOMEM;
1905	}
1906
1907	priv->md = chdev;
1908
 
 
 
 
1909	INIT_LIST_HEAD(&priv->db_filters);
1910	INIT_LIST_HEAD(&priv->pw_filters);
1911	spin_lock_init(&priv->fifo_lock);
1912	init_waitqueue_head(&priv->event_rx_wait);
1913	ret = kfifo_alloc(&priv->event_fifo,
1914			  sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
1915			  GFP_KERNEL);
1916	if (ret < 0) {
1917		put_device(&chdev->dev);
1918		dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
1919		ret = -ENOMEM;
1920		goto err_fifo;
1921	}
1922
1923#ifdef CONFIG_RAPIDIO_DMA_ENGINE
1924	INIT_LIST_HEAD(&priv->async_list);
1925	spin_lock_init(&priv->req_lock);
1926	mutex_init(&priv->dma_lock);
1927#endif
1928	mutex_lock(&chdev->file_mutex);
1929	list_add_tail(&priv->list, &chdev->file_list);
1930	mutex_unlock(&chdev->file_mutex);
1931
1932	filp->private_data = priv;
1933	goto out;
1934err_fifo:
1935	kfree(priv);
1936out:
1937	return ret;
1938}
1939
1940static int mport_cdev_fasync(int fd, struct file *filp, int mode)
1941{
1942	struct mport_cdev_priv *priv = filp->private_data;
1943
1944	return fasync_helper(fd, filp, mode, &priv->async_queue);
1945}
1946
1947#ifdef CONFIG_RAPIDIO_DMA_ENGINE
1948static void mport_cdev_release_dma(struct file *filp)
1949{
1950	struct mport_cdev_priv *priv = filp->private_data;
1951	struct mport_dev *md;
1952	struct mport_dma_req *req, *req_next;
1953	unsigned long tmo = msecs_to_jiffies(dma_timeout);
1954	long wret;
1955	LIST_HEAD(list);
1956
1957	rmcd_debug(EXIT, "from filp=%p %s(%d)",
1958		   filp, current->comm, task_pid_nr(current));
1959
1960	if (!priv->dmach) {
1961		rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
1962		return;
1963	}
1964
1965	md = priv->md;
1966
1967	spin_lock(&priv->req_lock);
1968	if (!list_empty(&priv->async_list)) {
1969		rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
1970			   filp, current->comm, task_pid_nr(current));
1971		list_splice_init(&priv->async_list, &list);
1972	}
1973	spin_unlock(&priv->req_lock);
1974
1975	if (!list_empty(&list)) {
1976		rmcd_debug(EXIT, "temp list not empty");
1977		list_for_each_entry_safe(req, req_next, &list, node) {
1978			rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
1979				   req->filp, req->cookie,
1980				   completion_done(&req->req_comp)?"yes":"no");
1981			list_del(&req->node);
1982			kref_put(&req->refcount, dma_req_free);
1983		}
1984	}
1985
1986	put_dma_channel(priv);
1987	wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);
1988
1989	if (wret <= 0) {
1990		rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
1991			current->comm, task_pid_nr(current), wret);
1992	}
1993
1994	if (priv->dmach != priv->md->dma_chan) {
1995		rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
1996			   filp, current->comm, task_pid_nr(current));
1997		rio_release_dma(priv->dmach);
1998	} else {
1999		rmcd_debug(EXIT, "Adjust default DMA channel refcount");
2000		kref_put(&md->dma_ref, mport_release_def_dma);
2001	}
2002
2003	priv->dmach = NULL;
2004}
2005#else
2006#define mport_cdev_release_dma(priv) do {} while (0)
2007#endif
2008
2009/*
2010 * mport_cdev_release() - Release character device
2011 */
2012static int mport_cdev_release(struct inode *inode, struct file *filp)
2013{
2014	struct mport_cdev_priv *priv = filp->private_data;
2015	struct mport_dev *chdev;
2016	struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
2017	struct rio_mport_db_filter *db_filter, *db_filter_next;
2018	struct rio_mport_mapping *map, *_map;
2019	unsigned long flags;
2020
2021	rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);
2022
2023	chdev = priv->md;
2024	mport_cdev_release_dma(filp);
2025
2026	priv->event_mask = 0;
2027
2028	spin_lock_irqsave(&chdev->pw_lock, flags);
2029	if (!list_empty(&priv->pw_filters)) {
2030		list_for_each_entry_safe(pw_filter, pw_filter_next,
2031					 &priv->pw_filters, priv_node)
2032			rio_mport_delete_pw_filter(pw_filter);
2033	}
2034	spin_unlock_irqrestore(&chdev->pw_lock, flags);
2035
2036	spin_lock_irqsave(&chdev->db_lock, flags);
2037	list_for_each_entry_safe(db_filter, db_filter_next,
2038				 &priv->db_filters, priv_node) {
2039		rio_mport_delete_db_filter(db_filter);
2040	}
2041	spin_unlock_irqrestore(&chdev->db_lock, flags);
2042
2043	kfifo_free(&priv->event_fifo);
2044
2045	mutex_lock(&chdev->buf_mutex);
2046	list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
2047		if (map->filp == filp) {
2048			rmcd_debug(EXIT, "release mapping %p filp=%p",
2049				   map->virt_addr, filp);
2050			kref_put(&map->ref, mport_release_mapping);
2051		}
2052	}
2053	mutex_unlock(&chdev->buf_mutex);
2054
2055	mport_cdev_fasync(-1, filp, 0);
2056	filp->private_data = NULL;
2057	mutex_lock(&chdev->file_mutex);
2058	list_del(&priv->list);
2059	mutex_unlock(&chdev->file_mutex);
2060	put_device(&chdev->dev);
2061	kfree(priv);
2062	return 0;
2063}
2064
2065/*
2066 * mport_cdev_ioctl() - IOCTLs for character device
2067 */
2068static long mport_cdev_ioctl(struct file *filp,
2069		unsigned int cmd, unsigned long arg)
2070{
2071	int err = -EINVAL;
2072	struct mport_cdev_priv *data = filp->private_data;
2073	struct mport_dev *md = data->md;
2074
2075	if (atomic_read(&md->active) == 0)
2076		return -ENODEV;
2077
2078	switch (cmd) {
2079	case RIO_MPORT_MAINT_READ_LOCAL:
2080		return rio_mport_maint_rd(data, (void __user *)arg, 1);
2081	case RIO_MPORT_MAINT_WRITE_LOCAL:
2082		return rio_mport_maint_wr(data, (void __user *)arg, 1);
2083	case RIO_MPORT_MAINT_READ_REMOTE:
2084		return rio_mport_maint_rd(data, (void __user *)arg, 0);
2085	case RIO_MPORT_MAINT_WRITE_REMOTE:
2086		return rio_mport_maint_wr(data, (void __user *)arg, 0);
2087	case RIO_MPORT_MAINT_HDID_SET:
2088		return maint_hdid_set(data, (void __user *)arg);
2089	case RIO_MPORT_MAINT_COMPTAG_SET:
2090		return maint_comptag_set(data, (void __user *)arg);
2091	case RIO_MPORT_MAINT_PORT_IDX_GET:
2092		return maint_port_idx_get(data, (void __user *)arg);
2093	case RIO_MPORT_GET_PROPERTIES:
2094		md->properties.hdid = md->mport->host_deviceid;
2095		if (copy_to_user((void __user *)arg, &(md->properties),
2096				 sizeof(md->properties)))
2097			return -EFAULT;
2098		return 0;
2099	case RIO_ENABLE_DOORBELL_RANGE:
2100		return rio_mport_add_db_filter(data, (void __user *)arg);
2101	case RIO_DISABLE_DOORBELL_RANGE:
2102		return rio_mport_remove_db_filter(data, (void __user *)arg);
2103	case RIO_ENABLE_PORTWRITE_RANGE:
2104		return rio_mport_add_pw_filter(data, (void __user *)arg);
2105	case RIO_DISABLE_PORTWRITE_RANGE:
2106		return rio_mport_remove_pw_filter(data, (void __user *)arg);
2107	case RIO_SET_EVENT_MASK:
2108		data->event_mask = (u32)arg;
2109		return 0;
2110	case RIO_GET_EVENT_MASK:
2111		if (copy_to_user((void __user *)arg, &data->event_mask,
2112				    sizeof(u32)))
2113			return -EFAULT;
2114		return 0;
2115	case RIO_MAP_OUTBOUND:
2116		return rio_mport_obw_map(filp, (void __user *)arg);
2117	case RIO_MAP_INBOUND:
2118		return rio_mport_map_inbound(filp, (void __user *)arg);
2119	case RIO_UNMAP_OUTBOUND:
2120		return rio_mport_obw_free(filp, (void __user *)arg);
2121	case RIO_UNMAP_INBOUND:
2122		return rio_mport_inbound_free(filp, (void __user *)arg);
2123	case RIO_ALLOC_DMA:
2124		return rio_mport_alloc_dma(filp, (void __user *)arg);
2125	case RIO_FREE_DMA:
2126		return rio_mport_free_dma(filp, (void __user *)arg);
2127	case RIO_WAIT_FOR_ASYNC:
2128		return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
2129	case RIO_TRANSFER:
2130		return rio_mport_transfer_ioctl(filp, (void __user *)arg);
2131	case RIO_DEV_ADD:
2132		return rio_mport_add_riodev(data, (void __user *)arg);
2133	case RIO_DEV_DEL:
2134		return rio_mport_del_riodev(data, (void __user *)arg);
2135	default:
2136		break;
2137	}
2138
2139	return err;
2140}
2141
2142/*
2143 * mport_release_mapping - free mapping resources and info structure
2144 * @ref: a pointer to the kref within struct rio_mport_mapping
2145 *
2146 * NOTE: Shall be called while holding buf_mutex.
2147 */
2148static void mport_release_mapping(struct kref *ref)
2149{
2150	struct rio_mport_mapping *map =
2151			container_of(ref, struct rio_mport_mapping, ref);
2152	struct rio_mport *mport = map->md->mport;
2153
2154	rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
2155		   map->dir, map->virt_addr,
2156		   &map->phys_addr, mport->name);
2157
2158	list_del(&map->node);
2159
2160	switch (map->dir) {
2161	case MAP_INBOUND:
2162		rio_unmap_inb_region(mport, map->phys_addr);
2163		fallthrough;
2164	case MAP_DMA:
2165		dma_free_coherent(mport->dev.parent, map->size,
2166				  map->virt_addr, map->phys_addr);
2167		break;
2168	case MAP_OUTBOUND:
2169		rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
2170		break;
2171	}
2172	kfree(map);
2173}
2174
2175static void mport_mm_open(struct vm_area_struct *vma)
2176{
2177	struct rio_mport_mapping *map = vma->vm_private_data;
2178
2179	rmcd_debug(MMAP, "%pad", &map->phys_addr);
2180	kref_get(&map->ref);
2181}
2182
2183static void mport_mm_close(struct vm_area_struct *vma)
2184{
2185	struct rio_mport_mapping *map = vma->vm_private_data;
2186
2187	rmcd_debug(MMAP, "%pad", &map->phys_addr);
2188	mutex_lock(&map->md->buf_mutex);
2189	kref_put(&map->ref, mport_release_mapping);
2190	mutex_unlock(&map->md->buf_mutex);
2191}
2192
2193static const struct vm_operations_struct vm_ops = {
2194	.open =	mport_mm_open,
2195	.close = mport_mm_close,
2196};
2197
2198static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
2199{
2200	struct mport_cdev_priv *priv = filp->private_data;
2201	struct mport_dev *md;
2202	size_t size = vma->vm_end - vma->vm_start;
2203	dma_addr_t baddr;
2204	unsigned long offset;
2205	int found = 0, ret;
2206	struct rio_mport_mapping *map;
2207
2208	rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
2209		   (unsigned int)size, vma->vm_pgoff);
2210
2211	md = priv->md;
2212	baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);
2213
2214	mutex_lock(&md->buf_mutex);
2215	list_for_each_entry(map, &md->mappings, node) {
2216		if (baddr >= map->phys_addr &&
2217		    baddr < (map->phys_addr + map->size)) {
2218			found = 1;
2219			break;
2220		}
2221	}
2222	mutex_unlock(&md->buf_mutex);
2223
2224	if (!found)
2225		return -ENOMEM;
2226
2227	offset = baddr - map->phys_addr;
2228
2229	if (size + offset > map->size)
2230		return -EINVAL;
2231
2232	vma->vm_pgoff = offset >> PAGE_SHIFT;
2233	rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);
2234
2235	if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
2236		ret = dma_mmap_coherent(md->mport->dev.parent, vma,
2237				map->virt_addr, map->phys_addr, map->size);
2238	else if (map->dir == MAP_OUTBOUND) {
2239		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
2240		ret = vm_iomap_memory(vma, map->phys_addr, map->size);
2241	} else {
2242		rmcd_error("Attempt to mmap unsupported mapping type");
2243		ret = -EIO;
2244	}
2245
2246	if (!ret) {
2247		vma->vm_private_data = map;
2248		vma->vm_ops = &vm_ops;
2249		mport_mm_open(vma);
2250	} else {
2251		rmcd_error("MMAP exit with err=%d", ret);
2252	}
2253
2254	return ret;
2255}
2256
2257static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait)
2258{
2259	struct mport_cdev_priv *priv = filp->private_data;
2260
2261	poll_wait(filp, &priv->event_rx_wait, wait);
2262	if (kfifo_len(&priv->event_fifo))
2263		return EPOLLIN | EPOLLRDNORM;
2264
2265	return 0;
2266}
2267
2268static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
2269			loff_t *ppos)
2270{
2271	struct mport_cdev_priv *priv = filp->private_data;
2272	int copied;
2273	ssize_t ret;
2274
2275	if (!count)
2276		return 0;
2277
2278	if (kfifo_is_empty(&priv->event_fifo) &&
2279	    (filp->f_flags & O_NONBLOCK))
2280		return -EAGAIN;
2281
2282	if (count % sizeof(struct rio_event))
2283		return -EINVAL;
2284
2285	ret = wait_event_interruptible(priv->event_rx_wait,
2286					kfifo_len(&priv->event_fifo) != 0);
2287	if (ret)
2288		return ret;
2289
2290	while (ret < count) {
2291		if (kfifo_to_user(&priv->event_fifo, buf,
2292		      sizeof(struct rio_event), &copied))
2293			return -EFAULT;
2294		ret += copied;
2295		buf += copied;
2296	}
2297
2298	return ret;
2299}
2300
2301static ssize_t mport_write(struct file *filp, const char __user *buf,
2302			 size_t count, loff_t *ppos)
2303{
2304	struct mport_cdev_priv *priv = filp->private_data;
2305	struct rio_mport *mport = priv->md->mport;
2306	struct rio_event event;
2307	int len, ret;
2308
2309	if (!count)
2310		return 0;
2311
2312	if (count % sizeof(event))
2313		return -EINVAL;
2314
2315	len = 0;
2316	while ((count - len) >= (int)sizeof(event)) {
2317		if (copy_from_user(&event, buf, sizeof(event)))
2318			return -EFAULT;
2319
2320		if (event.header != RIO_DOORBELL)
2321			return -EINVAL;
2322
2323		ret = rio_mport_send_doorbell(mport,
2324					      event.u.doorbell.rioid,
2325					      event.u.doorbell.payload);
2326		if (ret < 0)
2327			return ret;
2328
2329		len += sizeof(event);
2330		buf += sizeof(event);
2331	}
2332
2333	return len;
2334}
2335
2336static const struct file_operations mport_fops = {
2337	.owner		= THIS_MODULE,
2338	.open		= mport_cdev_open,
2339	.release	= mport_cdev_release,
2340	.poll		= mport_cdev_poll,
2341	.read		= mport_read,
2342	.write		= mport_write,
2343	.mmap		= mport_cdev_mmap,
2344	.fasync		= mport_cdev_fasync,
2345	.unlocked_ioctl = mport_cdev_ioctl
2346};
2347
2348/*
2349 * Character device management
2350 */
2351
2352static void mport_device_release(struct device *dev)
2353{
2354	struct mport_dev *md;
2355
2356	rmcd_debug(EXIT, "%s", dev_name(dev));
2357	md = container_of(dev, struct mport_dev, dev);
2358	kfree(md);
2359}
2360
2361/*
2362 * mport_cdev_add() - Create mport_dev from rio_mport
2363 * @mport:	RapidIO master port
2364 */
2365static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
2366{
2367	int ret = 0;
2368	struct mport_dev *md;
2369	struct rio_mport_attr attr;
2370
2371	md = kzalloc(sizeof(*md), GFP_KERNEL);
2372	if (!md) {
2373		rmcd_error("Unable allocate a device object");
2374		return NULL;
2375	}
2376
2377	md->mport = mport;
2378	mutex_init(&md->buf_mutex);
2379	mutex_init(&md->file_mutex);
2380	INIT_LIST_HEAD(&md->file_list);
2381
2382	device_initialize(&md->dev);
2383	md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
2384	md->dev.class = &dev_class;
2385	md->dev.parent = &mport->dev;
2386	md->dev.release = mport_device_release;
2387	dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
2388	atomic_set(&md->active, 1);
2389
2390	cdev_init(&md->cdev, &mport_fops);
2391	md->cdev.owner = THIS_MODULE;
2392
2393	INIT_LIST_HEAD(&md->doorbells);
2394	spin_lock_init(&md->db_lock);
2395	INIT_LIST_HEAD(&md->portwrites);
2396	spin_lock_init(&md->pw_lock);
2397	INIT_LIST_HEAD(&md->mappings);
2398
2399	md->properties.id = mport->id;
2400	md->properties.sys_size = mport->sys_size;
2401	md->properties.hdid = mport->host_deviceid;
2402	md->properties.index = mport->index;
2403
2404	/* The transfer_mode property will be returned through mport query
2405	 * interface
2406	 */
2407#ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2408	md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
2409#else
2410	md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
2411#endif
2412
2413	ret = cdev_device_add(&md->cdev, &md->dev);
2414	if (ret) {
2415		rmcd_error("Failed to register mport %d (err=%d)",
2416		       mport->id, ret);
2417		goto err_cdev;
2418	}
2419	ret = rio_query_mport(mport, &attr);
2420	if (!ret) {
2421		md->properties.flags = attr.flags;
2422		md->properties.link_speed = attr.link_speed;
2423		md->properties.link_width = attr.link_width;
2424		md->properties.dma_max_sge = attr.dma_max_sge;
2425		md->properties.dma_max_size = attr.dma_max_size;
2426		md->properties.dma_align = attr.dma_align;
2427		md->properties.cap_sys_size = 0;
2428		md->properties.cap_transfer_mode = 0;
2429		md->properties.cap_addr_size = 0;
2430	} else
2431		pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
2432			mport->name, MAJOR(dev_number), mport->id);
2433
2434	mutex_lock(&mport_devs_lock);
2435	list_add_tail(&md->node, &mport_devs);
2436	mutex_unlock(&mport_devs_lock);
2437
2438	pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
2439		mport->name, MAJOR(dev_number), mport->id);
2440
2441	return md;
2442
2443err_cdev:
2444	put_device(&md->dev);
2445	return NULL;
2446}
2447
2448/*
2449 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
2450 *                              associated DMA channels.
2451 */
2452static void mport_cdev_terminate_dma(struct mport_dev *md)
2453{
2454#ifdef CONFIG_RAPIDIO_DMA_ENGINE
2455	struct mport_cdev_priv *client;
2456
2457	rmcd_debug(DMA, "%s", dev_name(&md->dev));
2458
2459	mutex_lock(&md->file_mutex);
2460	list_for_each_entry(client, &md->file_list, list) {
2461		if (client->dmach) {
2462			dmaengine_terminate_all(client->dmach);
2463			rio_release_dma(client->dmach);
2464		}
2465	}
2466	mutex_unlock(&md->file_mutex);
2467
2468	if (md->dma_chan) {
2469		dmaengine_terminate_all(md->dma_chan);
2470		rio_release_dma(md->dma_chan);
2471		md->dma_chan = NULL;
2472	}
2473#endif
2474}
2475
2476
2477/*
2478 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
2479 *                            mport_cdev files.
2480 */
2481static int mport_cdev_kill_fasync(struct mport_dev *md)
2482{
2483	unsigned int files = 0;
2484	struct mport_cdev_priv *client;
2485
2486	mutex_lock(&md->file_mutex);
2487	list_for_each_entry(client, &md->file_list, list) {
2488		if (client->async_queue)
2489			kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
2490		files++;
2491	}
2492	mutex_unlock(&md->file_mutex);
2493	return files;
2494}
2495
2496/*
2497 * mport_cdev_remove() - Remove mport character device
2498 * @dev:	Mport device to remove
2499 */
2500static void mport_cdev_remove(struct mport_dev *md)
2501{
2502	struct rio_mport_mapping *map, *_map;
2503
2504	rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
2505	atomic_set(&md->active, 0);
2506	mport_cdev_terminate_dma(md);
2507	rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2508	cdev_device_del(&md->cdev, &md->dev);
2509	mport_cdev_kill_fasync(md);
2510
2511	/* TODO: do we need to give clients some time to close file
2512	 * descriptors? Simple wait for XX, or kref?
2513	 */
2514
2515	/*
2516	 * Release DMA buffers allocated for the mport device.
2517	 * Disable associated inbound Rapidio requests mapping if applicable.
2518	 */
2519	mutex_lock(&md->buf_mutex);
2520	list_for_each_entry_safe(map, _map, &md->mappings, node) {
2521		kref_put(&map->ref, mport_release_mapping);
2522	}
2523	mutex_unlock(&md->buf_mutex);
2524
2525	if (!list_empty(&md->mappings))
2526		rmcd_warn("WARNING: %s pending mappings on removal",
2527			  md->mport->name);
2528
2529	rio_release_inb_dbell(md->mport, 0, 0x0fff);
2530
2531	put_device(&md->dev);
2532}
2533
2534/*
2535 * RIO rio_mport_interface driver
2536 */
2537
2538/*
2539 * mport_add_mport() - Add rio_mport from LDM device struct
2540 * @dev:		Linux device model struct
 
2541 */
2542static int mport_add_mport(struct device *dev)
 
2543{
2544	struct rio_mport *mport = NULL;
2545	struct mport_dev *chdev = NULL;
2546
2547	mport = to_rio_mport(dev);
2548	if (!mport)
2549		return -ENODEV;
2550
2551	chdev = mport_cdev_add(mport);
2552	if (!chdev)
2553		return -ENODEV;
2554
2555	return 0;
2556}
2557
2558/*
2559 * mport_remove_mport() - Remove rio_mport from global list
2560 * TODO remove device from global mport_dev list
2561 */
2562static void mport_remove_mport(struct device *dev)
 
2563{
2564	struct rio_mport *mport = NULL;
2565	struct mport_dev *chdev;
2566	int found = 0;
2567
2568	mport = to_rio_mport(dev);
2569	rmcd_debug(EXIT, "Remove %s", mport->name);
2570
2571	mutex_lock(&mport_devs_lock);
2572	list_for_each_entry(chdev, &mport_devs, node) {
2573		if (chdev->mport->id == mport->id) {
2574			atomic_set(&chdev->active, 0);
2575			list_del(&chdev->node);
2576			found = 1;
2577			break;
2578		}
2579	}
2580	mutex_unlock(&mport_devs_lock);
2581
2582	if (found)
2583		mport_cdev_remove(chdev);
2584}
2585
2586/* the rio_mport_interface is used to handle local mport devices */
2587static struct class_interface rio_mport_interface __refdata = {
2588	.class		= &rio_mport_class,
2589	.add_dev	= mport_add_mport,
2590	.remove_dev	= mport_remove_mport,
2591};
2592
2593/*
2594 * Linux kernel module
2595 */
2596
2597/*
2598 * mport_init - Driver module loading
2599 */
2600static int __init mport_init(void)
2601{
2602	int ret;
2603
2604	/* Create device class needed by udev */
2605	ret = class_register(&dev_class);
2606	if (ret) {
2607		rmcd_error("Unable to create " DRV_NAME " class");
2608		return ret;
2609	}
2610
2611	ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
2612	if (ret < 0)
2613		goto err_chr;
2614
2615	rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));
2616
2617	/* Register to rio_mport_interface */
2618	ret = class_interface_register(&rio_mport_interface);
2619	if (ret) {
2620		rmcd_error("class_interface_register() failed, err=%d", ret);
2621		goto err_cli;
2622	}
2623
2624	return 0;
2625
2626err_cli:
2627	unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2628err_chr:
2629	class_unregister(&dev_class);
2630	return ret;
2631}
2632
2633/**
2634 * mport_exit - Driver module unloading
2635 */
2636static void __exit mport_exit(void)
2637{
2638	class_interface_unregister(&rio_mport_interface);
2639	class_unregister(&dev_class);
2640	unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
2641}
2642
2643module_init(mport_init);
2644module_exit(mport_exit);