rio_mport_cdev.c 64.8 KB
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
 * RapidIO mport character device
 *
 * Copyright 2014-2015 Integrated Device Technology, Inc.
 *    Alexandre Bounine <alexandre.bounine@idt.com>
 * Copyright 2014-2015 Prodrive Technologies
 *    Andre van Herk <andre.van.herk@prodrive-technologies.com>
 *    Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
 * Copyright (C) 2014 Texas Instruments Incorporated
 *    Aurelien Jacquiot <a-jacquiot@ti.com>
 */
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/cdev.h>
#include <linux/ioctl.h>
#include <linux/uaccess.h>
#include <linux/list.h>
#include <linux/fs.h>
#include <linux/err.h>
#include <linux/net.h>
#include <linux/poll.h>
#include <linux/spinlock.h>
#include <linux/sched.h>
#include <linux/kfifo.h>

#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/mman.h>

#include <linux/dma-mapping.h>
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
#include <linux/dmaengine.h>
#endif

#include <linux/rio.h>
#include <linux/rio_ids.h>
#include <linux/rio_drv.h>
#include <linux/rio_mport_cdev.h>

#include "../rio.h"

#define DRV_NAME	"rio_mport"
#define DRV_PREFIX	DRV_NAME ": "
#define DEV_NAME	"rio_mport"
#define DRV_VERSION     "1.0.0"

/* Debug output filtering masks */
enum {
	DBG_NONE	= 0,
	DBG_INIT	= BIT(0), /* driver init */
	DBG_EXIT	= BIT(1), /* driver exit */
	DBG_MPORT	= BIT(2), /* mport add/remove */
	DBG_RDEV	= BIT(3), /* RapidIO device add/remove */
	DBG_DMA		= BIT(4), /* DMA transfer messages */
	DBG_MMAP	= BIT(5), /* mapping messages */
	DBG_IBW		= BIT(6), /* inbound window */
	DBG_EVENT	= BIT(7), /* event handling messages */
	DBG_OBW		= BIT(8), /* outbound window messages */
	DBG_DBELL	= BIT(9), /* doorbell messages */
	DBG_ALL		= ~0,
};

#ifdef DEBUG
#define rmcd_debug(level, fmt, arg...)		\
	do {					\
		if (DBG_##level & dbg_level)	\
			pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
	} while (0)
#else
#define rmcd_debug(level, fmt, arg...) \
		no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
#endif

#define rmcd_warn(fmt, arg...) \
	pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)

#define rmcd_error(fmt, arg...) \
	pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)

MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>");
MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>");
MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>");
MODULE_DESCRIPTION("RapidIO mport character device driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

static int dma_timeout = 3000; /* DMA transfer timeout in msec */
module_param(dma_timeout, int, S_IRUGO);
MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)");

#ifdef DEBUG
static u32 dbg_level = DBG_NONE;
module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO);
MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
#endif

/*
 * An internal DMA coherent buffer
 */
struct mport_dma_buf {
	void		*ib_base;
	dma_addr_t	ib_phys;
	u32		ib_size;
	u64		ib_rio_base;
	bool		ib_map;
	struct file	*filp;
};

/*
 * Internal memory mapping structure
 */
enum rio_mport_map_dir {
	MAP_INBOUND,
	MAP_OUTBOUND,
	MAP_DMA,
};

struct rio_mport_mapping {
	struct list_head node;
	struct mport_dev *md;
	enum rio_mport_map_dir dir;
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	u16 rioid;
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	u64 rio_addr;
	dma_addr_t phys_addr; /* for mmap */
	void *virt_addr; /* kernel address, for dma_free_coherent */
	u64 size;
	struct kref ref; /* refcount of vmas sharing the mapping */
	struct file *filp;
};

struct rio_mport_dma_map {
	int valid;
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	u64 length;
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	void *vaddr;
	dma_addr_t paddr;
};

#define MPORT_MAX_DMA_BUFS	16
#define MPORT_EVENT_DEPTH	10

/*
 * mport_dev  driver-specific structure that represents mport device
 * @active    mport device status flag
 * @node      list node to maintain list of registered mports
 * @cdev      character device
 * @dev       associated device object
 * @mport     associated subsystem's master port device object
 * @buf_mutex lock for buffer handling
 * @file_mutex - lock for open files list
 * @file_list  - list of open files on given mport
 * @properties properties of this mport
 * @portwrites queue of inbound portwrites
 * @pw_lock    lock for port write queue
 * @mappings   queue for memory mappings
 * @dma_chan   DMA channels associated with this device
 * @dma_ref:
 * @comp:
 */
struct mport_dev {
	atomic_t		active;
	struct list_head	node;
	struct cdev		cdev;
	struct device		dev;
	struct rio_mport	*mport;
	struct mutex		buf_mutex;
	struct mutex		file_mutex;
	struct list_head	file_list;
	struct rio_mport_properties	properties;
	struct list_head		doorbells;
	spinlock_t			db_lock;
	struct list_head		portwrites;
	spinlock_t			pw_lock;
	struct list_head	mappings;
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
	struct dma_chan *dma_chan;
	struct kref	dma_ref;
	struct completion comp;
#endif
};

/*
 * mport_cdev_priv - data structure specific to individual file object
 *                   associated with an open device
 * @md    master port character device object
 * @async_queue - asynchronous notification queue
 * @list - file objects tracking list
 * @db_filters    inbound doorbell filters for this descriptor
 * @pw_filters    portwrite filters for this descriptor
 * @event_fifo    event fifo for this descriptor
 * @event_rx_wait wait queue for this descriptor
 * @fifo_lock     lock for event_fifo
 * @event_mask    event mask for this descriptor
 * @dmach DMA engine channel allocated for specific file object
 */
struct mport_cdev_priv {
	struct mport_dev	*md;
	struct fasync_struct	*async_queue;
	struct list_head	list;
	struct list_head	db_filters;
	struct list_head        pw_filters;
	struct kfifo            event_fifo;
	wait_queue_head_t       event_rx_wait;
	spinlock_t              fifo_lock;
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	u32			event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
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#ifdef CONFIG_RAPIDIO_DMA_ENGINE
	struct dma_chan		*dmach;
	struct list_head	async_list;
	spinlock_t              req_lock;
	struct mutex		dma_lock;
	struct kref		dma_ref;
	struct completion	comp;
#endif
};

/*
 * rio_mport_pw_filter - structure to describe a portwrite filter
 * md_node   node in mport device's list
 * priv_node node in private file object's list
 * priv      reference to private data
 * filter    actual portwrite filter
 */
struct rio_mport_pw_filter {
	struct list_head md_node;
	struct list_head priv_node;
	struct mport_cdev_priv *priv;
	struct rio_pw_filter filter;
};

/*
 * rio_mport_db_filter - structure to describe a doorbell filter
 * @data_node reference to device node
 * @priv_node node in private data
 * @priv      reference to private data
 * @filter    actual doorbell filter
 */
struct rio_mport_db_filter {
	struct list_head data_node;
	struct list_head priv_node;
	struct mport_cdev_priv *priv;
	struct rio_doorbell_filter filter;
};

static LIST_HEAD(mport_devs);
static DEFINE_MUTEX(mport_devs_lock);

#if (0) /* used by commented out portion of poll function : FIXME */
static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
#endif

static struct class *dev_class;
static dev_t dev_number;

static void mport_release_mapping(struct kref *ref);

static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
			      int local)
{
	struct rio_mport *mport = priv->md->mport;
	struct rio_mport_maint_io maint_io;
	u32 *buffer;
	u32 offset;
	size_t length;
	int ret, i;

	if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
		return -EFAULT;

	if ((maint_io.offset % 4) ||
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	    (maint_io.length == 0) || (maint_io.length % 4) ||
	    (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
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		return -EINVAL;

	buffer = vmalloc(maint_io.length);
	if (buffer == NULL)
		return -ENOMEM;
	length = maint_io.length/sizeof(u32);
	offset = maint_io.offset;

	for (i = 0; i < length; i++) {
		if (local)
			ret = __rio_local_read_config_32(mport,
				offset, &buffer[i]);
		else
			ret = rio_mport_read_config_32(mport, maint_io.rioid,
				maint_io.hopcount, offset, &buffer[i]);
		if (ret)
			goto out;

		offset += 4;
	}

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	if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
				   buffer, maint_io.length)))
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		ret = -EFAULT;
out:
	vfree(buffer);
	return ret;
}

static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
			      int local)
{
	struct rio_mport *mport = priv->md->mport;
	struct rio_mport_maint_io maint_io;
	u32 *buffer;
	u32 offset;
	size_t length;
	int ret = -EINVAL, i;

	if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
		return -EFAULT;

	if ((maint_io.offset % 4) ||
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	    (maint_io.length == 0) || (maint_io.length % 4) ||
	    (maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
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		return -EINVAL;

	buffer = vmalloc(maint_io.length);
	if (buffer == NULL)
		return -ENOMEM;
	length = maint_io.length;

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	if (unlikely(copy_from_user(buffer,
			(void __user *)(uintptr_t)maint_io.buffer, length))) {
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		ret = -EFAULT;
		goto out;
	}

	offset = maint_io.offset;
	length /= sizeof(u32);

	for (i = 0; i < length; i++) {
		if (local)
			ret = __rio_local_write_config_32(mport,
							  offset, buffer[i]);
		else
			ret = rio_mport_write_config_32(mport, maint_io.rioid,
							maint_io.hopcount,
							offset, buffer[i]);
		if (ret)
			goto out;

		offset += 4;
	}

out:
	vfree(buffer);
	return ret;
}


/*
 * Inbound/outbound memory mapping functions
 */
static int
rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
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				  u16 rioid, u64 raddr, u32 size,
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				  dma_addr_t *paddr)
{
	struct rio_mport *mport = md->mport;
	struct rio_mport_mapping *map;
	int ret;

	rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);

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	map = kzalloc(sizeof(*map), GFP_KERNEL);
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	if (map == NULL)
		return -ENOMEM;

	ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
	if (ret < 0)
		goto err_map_outb;

	map->dir = MAP_OUTBOUND;
	map->rioid = rioid;
	map->rio_addr = raddr;
	map->size = size;
	map->phys_addr = *paddr;
	map->filp = filp;
	map->md = md;
	kref_init(&map->ref);
	list_add_tail(&map->node, &md->mappings);
	return 0;
err_map_outb:
	kfree(map);
	return ret;
}

static int
rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
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			       u16 rioid, u64 raddr, u32 size,
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			       dma_addr_t *paddr)
{
	struct rio_mport_mapping *map;
	int err = -ENOMEM;

	mutex_lock(&md->buf_mutex);
	list_for_each_entry(map, &md->mappings, node) {
		if (map->dir != MAP_OUTBOUND)
			continue;
		if (rioid == map->rioid &&
		    raddr == map->rio_addr && size == map->size) {
			*paddr = map->phys_addr;
			err = 0;
			break;
		} else if (rioid == map->rioid &&
			   raddr < (map->rio_addr + map->size - 1) &&
			   (raddr + size) > map->rio_addr) {
			err = -EBUSY;
			break;
		}
	}

	/* If not found, create new */
	if (err == -ENOMEM)
		err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
						size, paddr);
	mutex_unlock(&md->buf_mutex);
	return err;
}

static int rio_mport_obw_map(struct file *filp, void __user *arg)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *data = priv->md;
	struct rio_mmap map;
	dma_addr_t paddr;
	int ret;

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	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
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		return -EFAULT;

	rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
		   map.rioid, map.rio_addr, map.length);

	ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
					     map.rio_addr, map.length, &paddr);
	if (ret < 0) {
		rmcd_error("Failed to set OBW err= %d", ret);
		return ret;
	}

	map.handle = paddr;

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	if (unlikely(copy_to_user(arg, &map, sizeof(map))))
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		return -EFAULT;
	return 0;
}

/*
 * rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
 *
 * @priv: driver private data
 * @arg:  buffer handle returned by allocation routine
 */
static int rio_mport_obw_free(struct file *filp, void __user *arg)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *md = priv->md;
	u64 handle;
	struct rio_mport_mapping *map, *_map;

	if (!md->mport->ops->unmap_outb)
		return -EPROTONOSUPPORT;

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	if (copy_from_user(&handle, arg, sizeof(handle)))
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		return -EFAULT;

	rmcd_debug(OBW, "h=0x%llx", handle);

	mutex_lock(&md->buf_mutex);
	list_for_each_entry_safe(map, _map, &md->mappings, node) {
		if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) {
			if (map->filp == filp) {
				rmcd_debug(OBW, "kref_put h=0x%llx", handle);
				map->filp = NULL;
				kref_put(&map->ref, mport_release_mapping);
			}
			break;
		}
	}
	mutex_unlock(&md->buf_mutex);

	return 0;
}

/*
 * maint_hdid_set() - Set the host Device ID
 * @priv: driver private data
 * @arg:	Device Id
 */
static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
{
	struct mport_dev *md = priv->md;
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	u16 hdid;
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	if (copy_from_user(&hdid, arg, sizeof(hdid)))
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		return -EFAULT;

	md->mport->host_deviceid = hdid;
	md->properties.hdid = hdid;
	rio_local_set_device_id(md->mport, hdid);

	rmcd_debug(MPORT, "Set host device Id to %d", hdid);

	return 0;
}

/*
 * maint_comptag_set() - Set the host Component Tag
 * @priv: driver private data
 * @arg:	Component Tag
 */
static int maint_comptag_set(struct mport_cdev_priv *priv, void __user *arg)
{
	struct mport_dev *md = priv->md;
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	u32 comptag;
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	if (copy_from_user(&comptag, arg, sizeof(comptag)))
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		return -EFAULT;

	rio_local_write_config_32(md->mport, RIO_COMPONENT_TAG_CSR, comptag);

	rmcd_debug(MPORT, "Set host Component Tag to %d", comptag);

	return 0;
}

#ifdef CONFIG_RAPIDIO_DMA_ENGINE

struct mport_dma_req {
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	struct kref refcount;
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	struct list_head node;
	struct file *filp;
	struct mport_cdev_priv *priv;
	enum rio_transfer_sync sync;
	struct sg_table sgt;
	struct page **page_list;
	unsigned int nr_pages;
	struct rio_mport_mapping *map;
	struct dma_chan *dmach;
	enum dma_data_direction dir;
	dma_cookie_t cookie;
	enum dma_status	status;
	struct completion req_comp;
};

static void mport_release_def_dma(struct kref *dma_ref)
{
	struct mport_dev *md =
			container_of(dma_ref, struct mport_dev, dma_ref);

	rmcd_debug(EXIT, "DMA_%d", md->dma_chan->chan_id);
	rio_release_dma(md->dma_chan);
	md->dma_chan = NULL;
}

static void mport_release_dma(struct kref *dma_ref)
{
	struct mport_cdev_priv *priv =
			container_of(dma_ref, struct mport_cdev_priv, dma_ref);

	rmcd_debug(EXIT, "DMA_%d", priv->dmach->chan_id);
	complete(&priv->comp);
}

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static void dma_req_free(struct kref *ref)
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{
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	struct mport_dma_req *req = container_of(ref, struct mport_dma_req,
			refcount);
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	struct mport_cdev_priv *priv = req->priv;
	unsigned int i;

	dma_unmap_sg(req->dmach->device->dev,
		     req->sgt.sgl, req->sgt.nents, req->dir);
	sg_free_table(&req->sgt);
	if (req->page_list) {
		for (i = 0; i < req->nr_pages; i++)
			put_page(req->page_list[i]);
		kfree(req->page_list);
	}

	if (req->map) {
		mutex_lock(&req->map->md->buf_mutex);
		kref_put(&req->map->ref, mport_release_mapping);
		mutex_unlock(&req->map->md->buf_mutex);
	}

	kref_put(&priv->dma_ref, mport_release_dma);

	kfree(req);
}

static void dma_xfer_callback(void *param)
{
	struct mport_dma_req *req = (struct mport_dma_req *)param;
	struct mport_cdev_priv *priv = req->priv;

	req->status = dma_async_is_tx_complete(priv->dmach, req->cookie,
					       NULL, NULL);
	complete(&req->req_comp);
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	kref_put(&req->refcount, dma_req_free);
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}

/*
 * prep_dma_xfer() - Configure and send request to DMAengine to prepare DMA
 *                   transfer object.
 * Returns pointer to DMA transaction descriptor allocated by DMA driver on
 * success or ERR_PTR (and/or NULL) if failed. Caller must check returned
 * non-NULL pointer using IS_ERR macro.
 */
static struct dma_async_tx_descriptor
*prep_dma_xfer(struct dma_chan *chan, struct rio_transfer_io *transfer,
	struct sg_table *sgt, int nents, enum dma_transfer_direction dir,
	enum dma_ctrl_flags flags)
{
	struct rio_dma_data tx_data;

	tx_data.sg = sgt->sgl;
	tx_data.sg_len = nents;
	tx_data.rio_addr_u = 0;
	tx_data.rio_addr = transfer->rio_addr;
	if (dir == DMA_MEM_TO_DEV) {
		switch (transfer->method) {
		case RIO_EXCHANGE_NWRITE:
			tx_data.wr_type = RDW_ALL_NWRITE;
			break;
		case RIO_EXCHANGE_NWRITE_R_ALL:
			tx_data.wr_type = RDW_ALL_NWRITE_R;
			break;
		case RIO_EXCHANGE_NWRITE_R:
			tx_data.wr_type = RDW_LAST_NWRITE_R;
			break;
		case RIO_EXCHANGE_DEFAULT:
			tx_data.wr_type = RDW_DEFAULT;
			break;
		default:
			return ERR_PTR(-EINVAL);
		}
	}

	return rio_dma_prep_xfer(chan, transfer->rioid, &tx_data, dir, flags);
}

/* Request DMA channel associated with this mport device.
 * Try to request DMA channel for every new process that opened given
 * mport. If a new DMA channel is not available use default channel
 * which is the first DMA channel opened on mport device.
 */
static int get_dma_channel(struct mport_cdev_priv *priv)
{
	mutex_lock(&priv->dma_lock);
	if (!priv->dmach) {
		priv->dmach = rio_request_mport_dma(priv->md->mport);
		if (!priv->dmach) {
			/* Use default DMA channel if available */
			if (priv->md->dma_chan) {
				priv->dmach = priv->md->dma_chan;
				kref_get(&priv->md->dma_ref);
			} else {
				rmcd_error("Failed to get DMA channel");
				mutex_unlock(&priv->dma_lock);
				return -ENODEV;
			}
		} else if (!priv->md->dma_chan) {
			/* Register default DMA channel if we do not have one */
			priv->md->dma_chan = priv->dmach;
			kref_init(&priv->md->dma_ref);
			rmcd_debug(DMA, "Register DMA_chan %d as default",
				   priv->dmach->chan_id);
		}

		kref_init(&priv->dma_ref);
		init_completion(&priv->comp);
	}

	kref_get(&priv->dma_ref);
	mutex_unlock(&priv->dma_lock);
	return 0;
}

static void put_dma_channel(struct mport_cdev_priv *priv)
{
	kref_put(&priv->dma_ref, mport_release_dma);
}

/*
 * DMA transfer functions
 */
static int do_dma_request(struct mport_dma_req *req,
			  struct rio_transfer_io *xfer,
			  enum rio_transfer_sync sync, int nents)
{
	struct mport_cdev_priv *priv;
	struct sg_table *sgt;
	struct dma_chan *chan;
	struct dma_async_tx_descriptor *tx;
	dma_cookie_t cookie;
	unsigned long tmo = msecs_to_jiffies(dma_timeout);
	enum dma_transfer_direction dir;
	long wret;
	int ret = 0;

	priv = req->priv;
	sgt = &req->sgt;

	chan = priv->dmach;
	dir = (req->dir == DMA_FROM_DEVICE) ? DMA_DEV_TO_MEM : DMA_MEM_TO_DEV;

	rmcd_debug(DMA, "%s(%d) uses %s for DMA_%s",
		   current->comm, task_pid_nr(current),
		   dev_name(&chan->dev->device),
		   (dir == DMA_DEV_TO_MEM)?"READ":"WRITE");

	/* Initialize DMA transaction request */
	tx = prep_dma_xfer(chan, xfer, sgt, nents, dir,
			   DMA_CTRL_ACK | DMA_PREP_INTERRUPT);

	if (!tx) {
		rmcd_debug(DMA, "prep error for %s A:0x%llx L:0x%llx",
			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
			xfer->rio_addr, xfer->length);
		ret = -EIO;
		goto err_out;
	} else if (IS_ERR(tx)) {
		ret = PTR_ERR(tx);
		rmcd_debug(DMA, "prep error %d for %s A:0x%llx L:0x%llx", ret,
			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
			xfer->rio_addr, xfer->length);
		goto err_out;
	}

736
	tx->callback = dma_xfer_callback;
737 738 739
	tx->callback_param = req;

	req->status = DMA_IN_PROGRESS;
740
	kref_get(&req->refcount);
741 742 743 744 745 746 747 748 749 750

	cookie = dmaengine_submit(tx);
	req->cookie = cookie;

	rmcd_debug(DMA, "pid=%d DMA_%s tx_cookie = %d", task_pid_nr(current),
		   (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);

	if (dma_submit_error(cookie)) {
		rmcd_error("submit err=%d (addr:0x%llx len:0x%llx)",
			   cookie, xfer->rio_addr, xfer->length);
751
		kref_put(&req->refcount, dma_req_free);
752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
		ret = -EIO;
		goto err_out;
	}

	dma_async_issue_pending(chan);

	if (sync == RIO_TRANSFER_ASYNC) {
		spin_lock(&priv->req_lock);
		list_add_tail(&req->node, &priv->async_list);
		spin_unlock(&priv->req_lock);
		return cookie;
	} else if (sync == RIO_TRANSFER_FAF)
		return 0;

	wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);

	if (wret == 0) {
		/* Timeout on wait occurred */
		rmcd_error("%s(%d) timed out waiting for DMA_%s %d",
		       current->comm, task_pid_nr(current),
		       (dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
		return -ETIMEDOUT;
	} else if (wret == -ERESTARTSYS) {
		/* Wait_for_completion was interrupted by a signal but DMA may
		 * be in progress
		 */
		rmcd_error("%s(%d) wait for DMA_%s %d was interrupted",
			current->comm, task_pid_nr(current),
			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE", cookie);
		return -EINTR;
	}

	if (req->status != DMA_COMPLETE) {
		/* DMA transaction completion was signaled with error */
		rmcd_error("%s(%d) DMA_%s %d completed with status %d (ret=%d)",
			current->comm, task_pid_nr(current),
			(dir == DMA_DEV_TO_MEM)?"READ":"WRITE",
			cookie, req->status, ret);
		ret = -EIO;
	}

err_out:
	return ret;
}

/*
 * rio_dma_transfer() - Perform RapidIO DMA data transfer to/from
 *                      the remote RapidIO device
 * @filp: file pointer associated with the call
 * @transfer_mode: DMA transfer mode
 * @sync: synchronization mode
 * @dir: DMA transfer direction (DMA_MEM_TO_DEV = write OR
 *                               DMA_DEV_TO_MEM = read)
 * @xfer: data transfer descriptor structure
 */
static int
808
rio_dma_transfer(struct file *filp, u32 transfer_mode,
809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831
		 enum rio_transfer_sync sync, enum dma_data_direction dir,
		 struct rio_transfer_io *xfer)
{
	struct mport_cdev_priv *priv = filp->private_data;
	unsigned long nr_pages = 0;
	struct page **page_list = NULL;
	struct mport_dma_req *req;
	struct mport_dev *md = priv->md;
	struct dma_chan *chan;
	int i, ret;
	int nents;

	if (xfer->length == 0)
		return -EINVAL;
	req = kzalloc(sizeof(*req), GFP_KERNEL);
	if (!req)
		return -ENOMEM;

	ret = get_dma_channel(priv);
	if (ret) {
		kfree(req);
		return ret;
	}
832 833 834 835 836 837 838 839 840
	chan = priv->dmach;

	kref_init(&req->refcount);
	init_completion(&req->req_comp);
	req->dir = dir;
	req->filp = filp;
	req->priv = priv;
	req->dmach = chan;
	req->sync = sync;
841 842 843 844 845 846 847 848 849 850 851

	/*
	 * If parameter loc_addr != NULL, we are transferring data from/to
	 * data buffer allocated in user-space: lock in memory user-space
	 * buffer pages and build an SG table for DMA transfer request
	 *
	 * Otherwise (loc_addr == NULL) contiguous kernel-space buffer is
	 * used for DMA data transfers: build single entry SG table using
	 * offset within the internal buffer specified by handle parameter.
	 */
	if (xfer->loc_addr) {
852
		unsigned int offset;
853 854
		long pinned;

855
		offset = lower_32_bits(offset_in_page(xfer->loc_addr));
856 857 858 859 860 861 862 863 864
		nr_pages = PAGE_ALIGN(xfer->length + offset) >> PAGE_SHIFT;

		page_list = kmalloc_array(nr_pages,
					  sizeof(*page_list), GFP_KERNEL);
		if (page_list == NULL) {
			ret = -ENOMEM;
			goto err_req;
		}

865
		pinned = get_user_pages_fast(
866
				(unsigned long)xfer->loc_addr & PAGE_MASK,
867 868 869
				nr_pages,
				dir == DMA_FROM_DEVICE ? FOLL_WRITE : 0,
				page_list);
870 871 872

		if (pinned != nr_pages) {
			if (pinned < 0) {
873 874
				rmcd_error("get_user_pages_unlocked err=%ld",
					   pinned);
875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931
				nr_pages = 0;
			} else
				rmcd_error("pinned %ld out of %ld pages",
					   pinned, nr_pages);
			ret = -EFAULT;
			goto err_pg;
		}

		ret = sg_alloc_table_from_pages(&req->sgt, page_list, nr_pages,
					offset, xfer->length, GFP_KERNEL);
		if (ret) {
			rmcd_error("sg_alloc_table failed with err=%d", ret);
			goto err_pg;
		}

		req->page_list = page_list;
		req->nr_pages = nr_pages;
	} else {
		dma_addr_t baddr;
		struct rio_mport_mapping *map;

		baddr = (dma_addr_t)xfer->handle;

		mutex_lock(&md->buf_mutex);
		list_for_each_entry(map, &md->mappings, node) {
			if (baddr >= map->phys_addr &&
			    baddr < (map->phys_addr + map->size)) {
				kref_get(&map->ref);
				req->map = map;
				break;
			}
		}
		mutex_unlock(&md->buf_mutex);

		if (req->map == NULL) {
			ret = -ENOMEM;
			goto err_req;
		}

		if (xfer->length + xfer->offset > map->size) {
			ret = -EINVAL;
			goto err_req;
		}

		ret = sg_alloc_table(&req->sgt, 1, GFP_KERNEL);
		if (unlikely(ret)) {
			rmcd_error("sg_alloc_table failed for internal buf");
			goto err_req;
		}

		sg_set_buf(req->sgt.sgl,
			   map->virt_addr + (baddr - map->phys_addr) +
				xfer->offset, xfer->length);
	}

	nents = dma_map_sg(chan->device->dev,
			   req->sgt.sgl, req->sgt.nents, dir);
932
	if (nents == 0) {
933
		rmcd_error("Failed to map SG list");
934 935
		ret = -EFAULT;
		goto err_pg;
936 937 938 939 940
	}

	ret = do_dma_request(req, xfer, sync, nents);

	if (ret >= 0) {
941 942 943 944
		if (sync == RIO_TRANSFER_ASYNC)
			return ret; /* return ASYNC cookie */
	} else {
		rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
945 946 947
	}

err_pg:
948
	if (!req->page_list) {
949 950 951 952 953
		for (i = 0; i < nr_pages; i++)
			put_page(page_list[i]);
		kfree(page_list);
	}
err_req:
954
	kref_put(&req->refcount, dma_req_free);
955 956 957 958 959 960 961 962 963 964 965 966 967 968
	return ret;
}

static int rio_mport_transfer_ioctl(struct file *filp, void __user *arg)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct rio_transaction transaction;
	struct rio_transfer_io *transfer;
	enum dma_data_direction dir;
	int i, ret = 0;

	if (unlikely(copy_from_user(&transaction, arg, sizeof(transaction))))
		return -EFAULT;

969
	if (transaction.count != 1) /* only single transfer for now */
970 971 972 973 974 975
		return -EINVAL;

	if ((transaction.transfer_mode &
	     priv->md->properties.transfer_mode) == 0)
		return -ENODEV;

976
	transfer = vmalloc(array_size(sizeof(*transfer), transaction.count));
977 978 979
	if (!transfer)
		return -ENOMEM;

980 981 982
	if (unlikely(copy_from_user(transfer,
				    (void __user *)(uintptr_t)transaction.block,
				    transaction.count * sizeof(*transfer)))) {
983 984 985 986 987 988 989 990 991 992
		ret = -EFAULT;
		goto out_free;
	}

	dir = (transaction.dir == RIO_TRANSFER_DIR_READ) ?
					DMA_FROM_DEVICE : DMA_TO_DEVICE;
	for (i = 0; i < transaction.count && ret == 0; i++)
		ret = rio_dma_transfer(filp, transaction.transfer_mode,
			transaction.sync, dir, &transfer[i]);

993 994 995
	if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
				  transfer,
				  transaction.count * sizeof(*transfer))))
996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069
		ret = -EFAULT;

out_free:
	vfree(transfer);

	return ret;
}

static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
{
	struct mport_cdev_priv *priv;
	struct rio_async_tx_wait w_param;
	struct mport_dma_req *req;
	dma_cookie_t cookie;
	unsigned long tmo;
	long wret;
	int found = 0;
	int ret;

	priv = (struct mport_cdev_priv *)filp->private_data;

	if (unlikely(copy_from_user(&w_param, arg, sizeof(w_param))))
		return -EFAULT;

	cookie = w_param.token;
	if (w_param.timeout)
		tmo = msecs_to_jiffies(w_param.timeout);
	else /* Use default DMA timeout */
		tmo = msecs_to_jiffies(dma_timeout);

	spin_lock(&priv->req_lock);
	list_for_each_entry(req, &priv->async_list, node) {
		if (req->cookie == cookie) {
			list_del(&req->node);
			found = 1;
			break;
		}
	}
	spin_unlock(&priv->req_lock);

	if (!found)
		return -EAGAIN;

	wret = wait_for_completion_interruptible_timeout(&req->req_comp, tmo);

	if (wret == 0) {
		/* Timeout on wait occurred */
		rmcd_error("%s(%d) timed out waiting for ASYNC DMA_%s",
		       current->comm, task_pid_nr(current),
		       (req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
		ret = -ETIMEDOUT;
		goto err_tmo;
	} else if (wret == -ERESTARTSYS) {
		/* Wait_for_completion was interrupted by a signal but DMA may
		 * be still in progress
		 */
		rmcd_error("%s(%d) wait for ASYNC DMA_%s was interrupted",
			current->comm, task_pid_nr(current),
			(req->dir == DMA_FROM_DEVICE)?"READ":"WRITE");
		ret = -EINTR;
		goto err_tmo;
	}

	if (req->status != DMA_COMPLETE) {
		/* DMA transaction completion signaled with transfer error */
		rmcd_error("%s(%d) ASYNC DMA_%s completion with status %d",
			current->comm, task_pid_nr(current),
			(req->dir == DMA_FROM_DEVICE)?"READ":"WRITE",
			req->status);
		ret = -EIO;
	} else
		ret = 0;

	if (req->status != DMA_IN_PROGRESS && req->status != DMA_PAUSED)
1070
		kref_put(&req->refcount, dma_req_free);
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082

	return ret;

err_tmo:
	/* Return request back into async queue */
	spin_lock(&priv->req_lock);
	list_add_tail(&req->node, &priv->async_list);
	spin_unlock(&priv->req_lock);
	return ret;
}

static int rio_mport_create_dma_mapping(struct mport_dev *md, struct file *filp,
1083
			u64 size, struct rio_mport_mapping **mapping)
1084 1085 1086
{
	struct rio_mport_mapping *map;

1087
	map = kzalloc(sizeof(*map), GFP_KERNEL);
1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
	if (map == NULL)
		return -ENOMEM;

	map->virt_addr = dma_alloc_coherent(md->mport->dev.parent, size,
					    &map->phys_addr, GFP_KERNEL);
	if (map->virt_addr == NULL) {
		kfree(map);
		return -ENOMEM;
	}

	map->dir = MAP_DMA;
	map->size = size;
	map->filp = filp;
	map->md = md;
	kref_init(&map->ref);
	mutex_lock(&md->buf_mutex);
	list_add_tail(&map->node, &md->mappings);
	mutex_unlock(&md->buf_mutex);
	*mapping = map;

	return 0;
}

static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *md = priv->md;
	struct rio_dma_mem map;
	struct rio_mport_mapping *mapping = NULL;
	int ret;

1119
	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1120 1121 1122 1123 1124 1125 1126 1127
		return -EFAULT;

	ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
	if (ret)
		return ret;

	map.dma_handle = mapping->phys_addr;

1128
	if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145
		mutex_lock(&md->buf_mutex);
		kref_put(&mapping->ref, mport_release_mapping);
		mutex_unlock(&md->buf_mutex);
		return -EFAULT;
	}

	return 0;
}

static int rio_mport_free_dma(struct file *filp, void __user *arg)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *md = priv->md;
	u64 handle;
	int ret = -EFAULT;
	struct rio_mport_mapping *map, *_map;

1146
	if (copy_from_user(&handle, arg, sizeof(handle)))
1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195
		return -EFAULT;
	rmcd_debug(EXIT, "filp=%p", filp);

	mutex_lock(&md->buf_mutex);
	list_for_each_entry_safe(map, _map, &md->mappings, node) {
		if (map->dir == MAP_DMA && map->phys_addr == handle &&
		    map->filp == filp) {
			kref_put(&map->ref, mport_release_mapping);
			ret = 0;
			break;
		}
	}
	mutex_unlock(&md->buf_mutex);

	if (ret == -EFAULT) {
		rmcd_debug(DMA, "ERR no matching mapping");
		return ret;
	}

	return 0;
}
#else
static int rio_mport_transfer_ioctl(struct file *filp, void *arg)
{
	return -ENODEV;
}

static int rio_mport_wait_for_async_dma(struct file *filp, void __user *arg)
{
	return -ENODEV;
}

static int rio_mport_alloc_dma(struct file *filp, void __user *arg)
{
	return -ENODEV;
}

static int rio_mport_free_dma(struct file *filp, void __user *arg)
{
	return -ENODEV;
}
#endif /* CONFIG_RAPIDIO_DMA_ENGINE */

/*
 * Inbound/outbound memory mapping functions
 */

static int
rio_mport_create_inbound_mapping(struct mport_dev *md, struct file *filp,
1196
				u64 raddr, u64 size,
1197 1198 1199 1200 1201 1202
				struct rio_mport_mapping **mapping)
{
	struct rio_mport *mport = md->mport;
	struct rio_mport_mapping *map;
	int ret;

1203 1204 1205 1206 1207
	/* rio_map_inb_region() accepts u32 size */
	if (size > 0xffffffff)
		return -EINVAL;

	map = kzalloc(sizeof(*map), GFP_KERNEL);
1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
	if (map == NULL)
		return -ENOMEM;

	map->virt_addr = dma_alloc_coherent(mport->dev.parent, size,
					    &map->phys_addr, GFP_KERNEL);
	if (map->virt_addr == NULL) {
		ret = -ENOMEM;
		goto err_dma_alloc;
	}

	if (raddr == RIO_MAP_ANY_ADDR)
		raddr = map->phys_addr;
1220
	ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245
	if (ret < 0)
		goto err_map_inb;

	map->dir = MAP_INBOUND;
	map->rio_addr = raddr;
	map->size = size;
	map->filp = filp;
	map->md = md;
	kref_init(&map->ref);
	mutex_lock(&md->buf_mutex);
	list_add_tail(&map->node, &md->mappings);
	mutex_unlock(&md->buf_mutex);
	*mapping = map;
	return 0;

err_map_inb:
	dma_free_coherent(mport->dev.parent, size,
			  map->virt_addr, map->phys_addr);
err_dma_alloc:
	kfree(map);
	return ret;
}

static int
rio_mport_get_inbound_mapping(struct mport_dev *md, struct file *filp,
1246
			      u64 raddr, u64 size,
1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288
			      struct rio_mport_mapping **mapping)
{
	struct rio_mport_mapping *map;
	int err = -ENOMEM;

	if (raddr == RIO_MAP_ANY_ADDR)
		goto get_new;

	mutex_lock(&md->buf_mutex);
	list_for_each_entry(map, &md->mappings, node) {
		if (map->dir != MAP_INBOUND)
			continue;
		if (raddr == map->rio_addr && size == map->size) {
			/* allow exact match only */
			*mapping = map;
			err = 0;
			break;
		} else if (raddr < (map->rio_addr + map->size - 1) &&
			   (raddr + size) > map->rio_addr) {
			err = -EBUSY;
			break;
		}
	}
	mutex_unlock(&md->buf_mutex);

	if (err != -ENOMEM)
		return err;
get_new:
	/* not found, create new */
	return rio_mport_create_inbound_mapping(md, filp, raddr, size, mapping);
}

static int rio_mport_map_inbound(struct file *filp, void __user *arg)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *md = priv->md;
	struct rio_mmap map;
	struct rio_mport_mapping *mapping = NULL;
	int ret;

	if (!md->mport->ops->map_inb)
		return -EPROTONOSUPPORT;
1289
	if (unlikely(copy_from_user(&map, arg, sizeof(map))))
1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301
		return -EFAULT;

	rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);

	ret = rio_mport_get_inbound_mapping(md, filp, map.rio_addr,
					    map.length, &mapping);
	if (ret)
		return ret;

	map.handle = mapping->phys_addr;
	map.rio_addr = mapping->rio_addr;

1302
	if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
		/* Delete mapping if it was created by this request */
		if (ret == 0 && mapping->filp == filp) {
			mutex_lock(&md->buf_mutex);
			kref_put(&mapping->ref, mport_release_mapping);
			mutex_unlock(&md->buf_mutex);
		}
		return -EFAULT;
	}

	return 0;
}

/*
 * rio_mport_inbound_free() - unmap from RapidIO address space and free
 *                    previously allocated inbound DMA coherent buffer
 * @priv: driver private data
 * @arg:  buffer handle returned by allocation routine
 */
static int rio_mport_inbound_free(struct file *filp, void __user *arg)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *md = priv->md;
	u64 handle;
	struct rio_mport_mapping *map, *_map;

	rmcd_debug(IBW, "%s filp=%p", dev_name(&priv->md->dev), filp);

	if (!md->mport->ops->unmap_inb)
		return -EPROTONOSUPPORT;

1333
	if (copy_from_user(&handle, arg, sizeof(handle)))
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
		return -EFAULT;

	mutex_lock(&md->buf_mutex);
	list_for_each_entry_safe(map, _map, &md->mappings, node) {
		if (map->dir == MAP_INBOUND && map->phys_addr == handle) {
			if (map->filp == filp) {
				map->filp = NULL;
				kref_put(&map->ref, mport_release_mapping);
			}
			break;
		}
	}
	mutex_unlock(&md->buf_mutex);

	return 0;
}

/*
 * maint_port_idx_get() - Get the port index of the mport instance
 * @priv: driver private data
 * @arg:  port index
 */
static int maint_port_idx_get(struct mport_cdev_priv *priv, void __user *arg)
{
	struct mport_dev *md = priv->md;
1359
	u32 port_idx = md->mport->index;
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408

	rmcd_debug(MPORT, "port_index=%d", port_idx);

	if (copy_to_user(arg, &port_idx, sizeof(port_idx)))
		return -EFAULT;

	return 0;
}

static int rio_mport_add_event(struct mport_cdev_priv *priv,
			       struct rio_event *event)
{
	int overflow;

	if (!(priv->event_mask & event->header))
		return -EACCES;

	spin_lock(&priv->fifo_lock);
	overflow = kfifo_avail(&priv->event_fifo) < sizeof(*event)
		|| kfifo_in(&priv->event_fifo, (unsigned char *)event,
			sizeof(*event)) != sizeof(*event);
	spin_unlock(&priv->fifo_lock);

	wake_up_interruptible(&priv->event_rx_wait);

	if (overflow) {
		dev_warn(&priv->md->dev, DRV_NAME ": event fifo overflow\n");
		return -EBUSY;
	}

	return 0;
}

static void rio_mport_doorbell_handler(struct rio_mport *mport, void *dev_id,
				       u16 src, u16 dst, u16 info)
{
	struct mport_dev *data = dev_id;
	struct mport_cdev_priv *priv;
	struct rio_mport_db_filter *db_filter;
	struct rio_event event;
	int handled;

	event.header = RIO_DOORBELL;
	event.u.doorbell.rioid = src;
	event.u.doorbell.payload = info;

	handled = 0;
	spin_lock(&data->db_lock);
	list_for_each_entry(db_filter, &data->doorbells, data_node) {
1409
		if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482
		      db_filter->filter.rioid == src)) &&
		      info >= db_filter->filter.low &&
		      info <= db_filter->filter.high) {
			priv = db_filter->priv;
			rio_mport_add_event(priv, &event);
			handled = 1;
		}
	}
	spin_unlock(&data->db_lock);

	if (!handled)
		dev_warn(&data->dev,
			"%s: spurious DB received from 0x%x, info=0x%04x\n",
			__func__, src, info);
}

static int rio_mport_add_db_filter(struct mport_cdev_priv *priv,
				   void __user *arg)
{
	struct mport_dev *md = priv->md;
	struct rio_mport_db_filter *db_filter;
	struct rio_doorbell_filter filter;
	unsigned long flags;
	int ret;

	if (copy_from_user(&filter, arg, sizeof(filter)))
		return -EFAULT;

	if (filter.low > filter.high)
		return -EINVAL;

	ret = rio_request_inb_dbell(md->mport, md, filter.low, filter.high,
				    rio_mport_doorbell_handler);
	if (ret) {
		rmcd_error("%s failed to register IBDB, err=%d",
			   dev_name(&md->dev), ret);
		return ret;
	}

	db_filter = kzalloc(sizeof(*db_filter), GFP_KERNEL);
	if (db_filter == NULL) {
		rio_release_inb_dbell(md->mport, filter.low, filter.high);
		return -ENOMEM;
	}

	db_filter->filter = filter;
	db_filter->priv = priv;
	spin_lock_irqsave(&md->db_lock, flags);
	list_add_tail(&db_filter->priv_node, &priv->db_filters);
	list_add_tail(&db_filter->data_node, &md->doorbells);
	spin_unlock_irqrestore(&md->db_lock, flags);

	return 0;
}

static void rio_mport_delete_db_filter(struct rio_mport_db_filter *db_filter)
{
	list_del(&db_filter->data_node);
	list_del(&db_filter->priv_node);
	kfree(db_filter);
}

static int rio_mport_remove_db_filter(struct mport_cdev_priv *priv,
				      void __user *arg)
{
	struct rio_mport_db_filter *db_filter;
	struct rio_doorbell_filter filter;
	unsigned long flags;
	int ret = -EINVAL;

	if (copy_from_user(&filter, arg, sizeof(filter)))
		return -EFAULT;

1483 1484 1485
	if (filter.low > filter.high)
		return -EINVAL;

1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688
	spin_lock_irqsave(&priv->md->db_lock, flags);
	list_for_each_entry(db_filter, &priv->db_filters, priv_node) {
		if (db_filter->filter.rioid == filter.rioid &&
		    db_filter->filter.low == filter.low &&
		    db_filter->filter.high == filter.high) {
			rio_mport_delete_db_filter(db_filter);
			ret = 0;
			break;
		}
	}
	spin_unlock_irqrestore(&priv->md->db_lock, flags);

	if (!ret)
		rio_release_inb_dbell(priv->md->mport, filter.low, filter.high);

	return ret;
}

static int rio_mport_match_pw(union rio_pw_msg *msg,
			      struct rio_pw_filter *filter)
{
	if ((msg->em.comptag & filter->mask) < filter->low ||
		(msg->em.comptag & filter->mask) > filter->high)
		return 0;
	return 1;
}

static int rio_mport_pw_handler(struct rio_mport *mport, void *context,
				union rio_pw_msg *msg, int step)
{
	struct mport_dev *md = context;
	struct mport_cdev_priv *priv;
	struct rio_mport_pw_filter *pw_filter;
	struct rio_event event;
	int handled;

	event.header = RIO_PORTWRITE;
	memcpy(event.u.portwrite.payload, msg->raw, RIO_PW_MSG_SIZE);

	handled = 0;
	spin_lock(&md->pw_lock);
	list_for_each_entry(pw_filter, &md->portwrites, md_node) {
		if (rio_mport_match_pw(msg, &pw_filter->filter)) {
			priv = pw_filter->priv;
			rio_mport_add_event(priv, &event);
			handled = 1;
		}
	}
	spin_unlock(&md->pw_lock);

	if (!handled) {
		printk_ratelimited(KERN_WARNING DRV_NAME
			": mport%d received spurious PW from 0x%08x\n",
			mport->id, msg->em.comptag);
	}

	return 0;
}

static int rio_mport_add_pw_filter(struct mport_cdev_priv *priv,
				   void __user *arg)
{
	struct mport_dev *md = priv->md;
	struct rio_mport_pw_filter *pw_filter;
	struct rio_pw_filter filter;
	unsigned long flags;
	int hadd = 0;

	if (copy_from_user(&filter, arg, sizeof(filter)))
		return -EFAULT;

	pw_filter = kzalloc(sizeof(*pw_filter), GFP_KERNEL);
	if (pw_filter == NULL)
		return -ENOMEM;

	pw_filter->filter = filter;
	pw_filter->priv = priv;
	spin_lock_irqsave(&md->pw_lock, flags);
	if (list_empty(&md->portwrites))
		hadd = 1;
	list_add_tail(&pw_filter->priv_node, &priv->pw_filters);
	list_add_tail(&pw_filter->md_node, &md->portwrites);
	spin_unlock_irqrestore(&md->pw_lock, flags);

	if (hadd) {
		int ret;

		ret = rio_add_mport_pw_handler(md->mport, md,
					       rio_mport_pw_handler);
		if (ret) {
			dev_err(&md->dev,
				"%s: failed to add IB_PW handler, err=%d\n",
				__func__, ret);
			return ret;
		}
		rio_pw_enable(md->mport, 1);
	}

	return 0;
}

static void rio_mport_delete_pw_filter(struct rio_mport_pw_filter *pw_filter)
{
	list_del(&pw_filter->md_node);
	list_del(&pw_filter->priv_node);
	kfree(pw_filter);
}

static int rio_mport_match_pw_filter(struct rio_pw_filter *a,
				     struct rio_pw_filter *b)
{
	if ((a->mask == b->mask) && (a->low == b->low) && (a->high == b->high))
		return 1;
	return 0;
}

static int rio_mport_remove_pw_filter(struct mport_cdev_priv *priv,
				      void __user *arg)
{
	struct mport_dev *md = priv->md;
	struct rio_mport_pw_filter *pw_filter;
	struct rio_pw_filter filter;
	unsigned long flags;
	int ret = -EINVAL;
	int hdel = 0;

	if (copy_from_user(&filter, arg, sizeof(filter)))
		return -EFAULT;

	spin_lock_irqsave(&md->pw_lock, flags);
	list_for_each_entry(pw_filter, &priv->pw_filters, priv_node) {
		if (rio_mport_match_pw_filter(&pw_filter->filter, &filter)) {
			rio_mport_delete_pw_filter(pw_filter);
			ret = 0;
			break;
		}
	}

	if (list_empty(&md->portwrites))
		hdel = 1;
	spin_unlock_irqrestore(&md->pw_lock, flags);

	if (hdel) {
		rio_del_mport_pw_handler(md->mport, priv->md,
					 rio_mport_pw_handler);
		rio_pw_enable(md->mport, 0);
	}

	return ret;
}

/*
 * rio_release_dev - release routine for kernel RIO device object
 * @dev: kernel device object associated with a RIO device structure
 *
 * Frees a RIO device struct associated a RIO device struct.
 * The RIO device struct is freed.
 */
static void rio_release_dev(struct device *dev)
{
	struct rio_dev *rdev;

	rdev = to_rio_dev(dev);
	pr_info(DRV_PREFIX "%s: %s\n", __func__, rio_name(rdev));
	kfree(rdev);
}


static void rio_release_net(struct device *dev)
{
	struct rio_net *net;

	net = to_rio_net(dev);
	rmcd_debug(RDEV, "net_%d", net->id);
	kfree(net);
}


/*
 * rio_mport_add_riodev - creates a kernel RIO device object
 *
 * Allocates a RIO device data structure and initializes required fields based
 * on device's configuration space contents.
 * If the device has switch capabilities, then a switch specific portion is
 * allocated and configured.
 */
static int rio_mport_add_riodev(struct mport_cdev_priv *priv,
				   void __user *arg)
{
	struct mport_dev *md = priv->md;
	struct rio_rdev_info dev_info;
	struct rio_dev *rdev;
	struct rio_switch *rswitch = NULL;
	struct rio_mport *mport;
	size_t size;
	u32 rval;
	u32 swpinfo = 0;
	u16 destid;
	u8 hopcount;
	int err;

	if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
		return -EFAULT;
1689
	dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1690 1691 1692 1693 1694 1695 1696 1697 1698

	rmcd_debug(RDEV, "name:%s ct:0x%x did:0x%x hc:0x%x", dev_info.name,
		   dev_info.comptag, dev_info.destid, dev_info.hopcount);

	if (bus_find_device_by_name(&rio_bus_type, NULL, dev_info.name)) {
		rmcd_debug(RDEV, "device %s already exists", dev_info.name);
		return -EEXIST;
	}

1699
	size = sizeof(*rdev);
1700
	mport = md->mport;
1701 1702
	destid = dev_info.destid;
	hopcount = dev_info.hopcount;
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761

	if (rio_mport_read_config_32(mport, destid, hopcount,
				     RIO_PEF_CAR, &rval))
		return -EIO;

	if (rval & RIO_PEF_SWITCH) {
		rio_mport_read_config_32(mport, destid, hopcount,
					 RIO_SWP_INFO_CAR, &swpinfo);
		size += (RIO_GET_TOTAL_PORTS(swpinfo) *
			 sizeof(rswitch->nextdev[0])) + sizeof(*rswitch);
	}

	rdev = kzalloc(size, GFP_KERNEL);
	if (rdev == NULL)
		return -ENOMEM;

	if (mport->net == NULL) {
		struct rio_net *net;

		net = rio_alloc_net(mport);
		if (!net) {
			err = -ENOMEM;
			rmcd_debug(RDEV, "failed to allocate net object");
			goto cleanup;
		}

		net->id = mport->id;
		net->hport = mport;
		dev_set_name(&net->dev, "rnet_%d", net->id);
		net->dev.parent = &mport->dev;
		net->dev.release = rio_release_net;
		err = rio_add_net(net);
		if (err) {
			rmcd_debug(RDEV, "failed to register net, err=%d", err);
			kfree(net);
			goto cleanup;
		}
	}

	rdev->net = mport->net;
	rdev->pef = rval;
	rdev->swpinfo = swpinfo;
	rio_mport_read_config_32(mport, destid, hopcount,
				 RIO_DEV_ID_CAR, &rval);
	rdev->did = rval >> 16;
	rdev->vid = rval & 0xffff;
	rio_mport_read_config_32(mport, destid, hopcount, RIO_DEV_INFO_CAR,
				 &rdev->device_rev);
	rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_ID_CAR,
				 &rval);
	rdev->asm_did = rval >> 16;
	rdev->asm_vid = rval & 0xffff;
	rio_mport_read_config_32(mport, destid, hopcount, RIO_ASM_INFO_CAR,
				 &rval);
	rdev->asm_rev = rval >> 16;

	if (rdev->pef & RIO_PEF_EXT_FEATURES) {
		rdev->efptr = rval & 0xffff;
		rdev->phys_efptr = rio_mport_get_physefb(mport, 0, destid,
1762
						hopcount, &rdev->phys_rmap);
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820

		rdev->em_efptr = rio_mport_get_feature(mport, 0, destid,
						hopcount, RIO_EFB_ERR_MGMNT);
	}

	rio_mport_read_config_32(mport, destid, hopcount, RIO_SRC_OPS_CAR,
				 &rdev->src_ops);
	rio_mport_read_config_32(mport, destid, hopcount, RIO_DST_OPS_CAR,
				 &rdev->dst_ops);

	rdev->comp_tag = dev_info.comptag;
	rdev->destid = destid;
	/* hopcount is stored as specified by a caller, regardles of EP or SW */
	rdev->hopcount = hopcount;

	if (rdev->pef & RIO_PEF_SWITCH) {
		rswitch = rdev->rswitch;
		rswitch->route_table = NULL;
	}

	if (strlen(dev_info.name))
		dev_set_name(&rdev->dev, "%s", dev_info.name);
	else if (rdev->pef & RIO_PEF_SWITCH)
		dev_set_name(&rdev->dev, "%02x:s:%04x", mport->id,
			     rdev->comp_tag & RIO_CTAG_UDEVID);
	else
		dev_set_name(&rdev->dev, "%02x:e:%04x", mport->id,
			     rdev->comp_tag & RIO_CTAG_UDEVID);

	INIT_LIST_HEAD(&rdev->net_list);
	rdev->dev.parent = &mport->net->dev;
	rio_attach_device(rdev);
	rdev->dev.release = rio_release_dev;

	if (rdev->dst_ops & RIO_DST_OPS_DOORBELL)
		rio_init_dbell_res(&rdev->riores[RIO_DOORBELL_RESOURCE],
				   0, 0xffff);
	err = rio_add_device(rdev);
	if (err)
		goto cleanup;
	rio_dev_get(rdev);

	return 0;
cleanup:
	kfree(rdev);
	return err;
}

static int rio_mport_del_riodev(struct mport_cdev_priv *priv, void __user *arg)
{
	struct rio_rdev_info dev_info;
	struct rio_dev *rdev = NULL;
	struct device  *dev;
	struct rio_mport *mport;
	struct rio_net *net;

	if (copy_from_user(&dev_info, arg, sizeof(dev_info)))
		return -EFAULT;
1821
	dev_info.name[sizeof(dev_info.name) - 1] = '\0';
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834

	mport = priv->md->mport;

	/* If device name is specified, removal by name has priority */
	if (strlen(dev_info.name)) {
		dev = bus_find_device_by_name(&rio_bus_type, NULL,
					      dev_info.name);
		if (dev)
			rdev = to_rio_dev(dev);
	} else {
		do {
			rdev = rio_get_comptag(dev_info.comptag, rdev);
			if (rdev && rdev->dev.parent == &mport->net->dev &&
1835 1836
			    rdev->destid == dev_info.destid &&
			    rdev->hopcount == dev_info.hopcount)
1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
				break;
		} while (rdev);
	}

	if (!rdev) {
		rmcd_debug(RDEV,
			"device name:%s ct:0x%x did:0x%x hc:0x%x not found",
			dev_info.name, dev_info.comptag, dev_info.destid,
			dev_info.hopcount);
		return -ENODEV;
	}

	net = rdev->net;
	rio_dev_put(rdev);
	rio_del_device(rdev, RIO_DEVICE_SHUTDOWN);

	if (list_empty(&net->devices)) {
		rio_free_net(net);
		mport->net = NULL;
	}

	return 0;
}

/*
 * Mport cdev management
 */

/*
 * mport_cdev_open() - Open character device (mport)
 */
static int mport_cdev_open(struct inode *inode, struct file *filp)
{
	int ret;
	int minor = iminor(inode);
	struct mport_dev *chdev;
	struct mport_cdev_priv *priv;

	/* Test for valid device */
	if (minor >= RIO_MAX_MPORTS) {
		rmcd_error("Invalid minor device number");
		return -EINVAL;
	}

	chdev = container_of(inode->i_cdev, struct mport_dev, cdev);

	rmcd_debug(INIT, "%s filp=%p", dev_name(&chdev->dev), filp);

	if (atomic_read(&chdev->active) == 0)
		return -ENODEV;

	get_device(&chdev->dev);

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		put_device(&chdev->dev);
		return -ENOMEM;
	}

	priv->md = chdev;

	mutex_lock(&chdev->file_mutex);
	list_add_tail(&priv->list, &chdev->file_list);
	mutex_unlock(&chdev->file_mutex);

	INIT_LIST_HEAD(&priv->db_filters);
	INIT_LIST_HEAD(&priv->pw_filters);
	spin_lock_init(&priv->fifo_lock);
	init_waitqueue_head(&priv->event_rx_wait);
	ret = kfifo_alloc(&priv->event_fifo,
			  sizeof(struct rio_event) * MPORT_EVENT_DEPTH,
			  GFP_KERNEL);
	if (ret < 0) {
		dev_err(&chdev->dev, DRV_NAME ": kfifo_alloc failed\n");
		ret = -ENOMEM;
		goto err_fifo;
	}

#ifdef CONFIG_RAPIDIO_DMA_ENGINE
	INIT_LIST_HEAD(&priv->async_list);
	spin_lock_init(&priv->req_lock);
	mutex_init(&priv->dma_lock);
#endif

	filp->private_data = priv;
	goto out;
err_fifo:
	kfree(priv);
out:
	return ret;
}

static int mport_cdev_fasync(int fd, struct file *filp, int mode)
{
	struct mport_cdev_priv *priv = filp->private_data;

	return fasync_helper(fd, filp, mode, &priv->async_queue);
}

#ifdef CONFIG_RAPIDIO_DMA_ENGINE
static void mport_cdev_release_dma(struct file *filp)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *md;
	struct mport_dma_req *req, *req_next;
	unsigned long tmo = msecs_to_jiffies(dma_timeout);
	long wret;
	LIST_HEAD(list);

	rmcd_debug(EXIT, "from filp=%p %s(%d)",
		   filp, current->comm, task_pid_nr(current));

	if (!priv->dmach) {
		rmcd_debug(EXIT, "No DMA channel for filp=%p", filp);
		return;
	}

	md = priv->md;

	spin_lock(&priv->req_lock);
	if (!list_empty(&priv->async_list)) {
		rmcd_debug(EXIT, "async list not empty filp=%p %s(%d)",
			   filp, current->comm, task_pid_nr(current));
		list_splice_init(&priv->async_list, &list);
	}
	spin_unlock(&priv->req_lock);

	if (!list_empty(&list)) {
		rmcd_debug(EXIT, "temp list not empty");
		list_for_each_entry_safe(req, req_next, &list, node) {
			rmcd_debug(EXIT, "free req->filp=%p cookie=%d compl=%s",
				   req->filp, req->cookie,
				   completion_done(&req->req_comp)?"yes":"no");
			list_del(&req->node);
1971
			kref_put(&req->refcount, dma_req_free);
1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083
		}
	}

	put_dma_channel(priv);
	wret = wait_for_completion_interruptible_timeout(&priv->comp, tmo);

	if (wret <= 0) {
		rmcd_error("%s(%d) failed waiting for DMA release err=%ld",
			current->comm, task_pid_nr(current), wret);
	}

	if (priv->dmach != priv->md->dma_chan) {
		rmcd_debug(EXIT, "Release DMA channel for filp=%p %s(%d)",
			   filp, current->comm, task_pid_nr(current));
		rio_release_dma(priv->dmach);
	} else {
		rmcd_debug(EXIT, "Adjust default DMA channel refcount");
		kref_put(&md->dma_ref, mport_release_def_dma);
	}

	priv->dmach = NULL;
}
#else
#define mport_cdev_release_dma(priv) do {} while (0)
#endif

/*
 * mport_cdev_release() - Release character device
 */
static int mport_cdev_release(struct inode *inode, struct file *filp)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *chdev;
	struct rio_mport_pw_filter *pw_filter, *pw_filter_next;
	struct rio_mport_db_filter *db_filter, *db_filter_next;
	struct rio_mport_mapping *map, *_map;
	unsigned long flags;

	rmcd_debug(EXIT, "%s filp=%p", dev_name(&priv->md->dev), filp);

	chdev = priv->md;
	mport_cdev_release_dma(filp);

	priv->event_mask = 0;

	spin_lock_irqsave(&chdev->pw_lock, flags);
	if (!list_empty(&priv->pw_filters)) {
		list_for_each_entry_safe(pw_filter, pw_filter_next,
					 &priv->pw_filters, priv_node)
			rio_mport_delete_pw_filter(pw_filter);
	}
	spin_unlock_irqrestore(&chdev->pw_lock, flags);

	spin_lock_irqsave(&chdev->db_lock, flags);
	list_for_each_entry_safe(db_filter, db_filter_next,
				 &priv->db_filters, priv_node) {
		rio_mport_delete_db_filter(db_filter);
	}
	spin_unlock_irqrestore(&chdev->db_lock, flags);

	kfifo_free(&priv->event_fifo);

	mutex_lock(&chdev->buf_mutex);
	list_for_each_entry_safe(map, _map, &chdev->mappings, node) {
		if (map->filp == filp) {
			rmcd_debug(EXIT, "release mapping %p filp=%p",
				   map->virt_addr, filp);
			kref_put(&map->ref, mport_release_mapping);
		}
	}
	mutex_unlock(&chdev->buf_mutex);

	mport_cdev_fasync(-1, filp, 0);
	filp->private_data = NULL;
	mutex_lock(&chdev->file_mutex);
	list_del(&priv->list);
	mutex_unlock(&chdev->file_mutex);
	put_device(&chdev->dev);
	kfree(priv);
	return 0;
}

/*
 * mport_cdev_ioctl() - IOCTLs for character device
 */
static long mport_cdev_ioctl(struct file *filp,
		unsigned int cmd, unsigned long arg)
{
	int err = -EINVAL;
	struct mport_cdev_priv *data = filp->private_data;
	struct mport_dev *md = data->md;

	if (atomic_read(&md->active) == 0)
		return -ENODEV;

	switch (cmd) {
	case RIO_MPORT_MAINT_READ_LOCAL:
		return rio_mport_maint_rd(data, (void __user *)arg, 1);
	case RIO_MPORT_MAINT_WRITE_LOCAL:
		return rio_mport_maint_wr(data, (void __user *)arg, 1);
	case RIO_MPORT_MAINT_READ_REMOTE:
		return rio_mport_maint_rd(data, (void __user *)arg, 0);
	case RIO_MPORT_MAINT_WRITE_REMOTE:
		return rio_mport_maint_wr(data, (void __user *)arg, 0);
	case RIO_MPORT_MAINT_HDID_SET:
		return maint_hdid_set(data, (void __user *)arg);
	case RIO_MPORT_MAINT_COMPTAG_SET:
		return maint_comptag_set(data, (void __user *)arg);
	case RIO_MPORT_MAINT_PORT_IDX_GET:
		return maint_port_idx_get(data, (void __user *)arg);
	case RIO_MPORT_GET_PROPERTIES:
		md->properties.hdid = md->mport->host_deviceid;
2084 2085
		if (copy_to_user((void __user *)arg, &(md->properties),
				 sizeof(md->properties)))
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096
			return -EFAULT;
		return 0;
	case RIO_ENABLE_DOORBELL_RANGE:
		return rio_mport_add_db_filter(data, (void __user *)arg);
	case RIO_DISABLE_DOORBELL_RANGE:
		return rio_mport_remove_db_filter(data, (void __user *)arg);
	case RIO_ENABLE_PORTWRITE_RANGE:
		return rio_mport_add_pw_filter(data, (void __user *)arg);
	case RIO_DISABLE_PORTWRITE_RANGE:
		return rio_mport_remove_pw_filter(data, (void __user *)arg);
	case RIO_SET_EVENT_MASK:
2097
		data->event_mask = (u32)arg;
2098 2099 2100
		return 0;
	case RIO_GET_EVENT_MASK:
		if (copy_to_user((void __user *)arg, &data->event_mask,
2101
				    sizeof(u32)))
2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151
			return -EFAULT;
		return 0;
	case RIO_MAP_OUTBOUND:
		return rio_mport_obw_map(filp, (void __user *)arg);
	case RIO_MAP_INBOUND:
		return rio_mport_map_inbound(filp, (void __user *)arg);
	case RIO_UNMAP_OUTBOUND:
		return rio_mport_obw_free(filp, (void __user *)arg);
	case RIO_UNMAP_INBOUND:
		return rio_mport_inbound_free(filp, (void __user *)arg);
	case RIO_ALLOC_DMA:
		return rio_mport_alloc_dma(filp, (void __user *)arg);
	case RIO_FREE_DMA:
		return rio_mport_free_dma(filp, (void __user *)arg);
	case RIO_WAIT_FOR_ASYNC:
		return rio_mport_wait_for_async_dma(filp, (void __user *)arg);
	case RIO_TRANSFER:
		return rio_mport_transfer_ioctl(filp, (void __user *)arg);
	case RIO_DEV_ADD:
		return rio_mport_add_riodev(data, (void __user *)arg);
	case RIO_DEV_DEL:
		return rio_mport_del_riodev(data, (void __user *)arg);
	default:
		break;
	}

	return err;
}

/*
 * mport_release_mapping - free mapping resources and info structure
 * @ref: a pointer to the kref within struct rio_mport_mapping
 *
 * NOTE: Shall be called while holding buf_mutex.
 */
static void mport_release_mapping(struct kref *ref)
{
	struct rio_mport_mapping *map =
			container_of(ref, struct rio_mport_mapping, ref);
	struct rio_mport *mport = map->md->mport;

	rmcd_debug(MMAP, "type %d mapping @ %p (phys = %pad) for %s",
		   map->dir, map->virt_addr,
		   &map->phys_addr, mport->name);

	list_del(&map->node);

	switch (map->dir) {
	case MAP_INBOUND:
		rio_unmap_inb_region(mport, map->phys_addr);
2152
		/* fall through */
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167
	case MAP_DMA:
		dma_free_coherent(mport->dev.parent, map->size,
				  map->virt_addr, map->phys_addr);
		break;
	case MAP_OUTBOUND:
		rio_unmap_outb_region(mport, map->rioid, map->rio_addr);
		break;
	}
	kfree(map);
}

static void mport_mm_open(struct vm_area_struct *vma)
{
	struct rio_mport_mapping *map = vma->vm_private_data;

2168
	rmcd_debug(MMAP, "%pad", &map->phys_addr);
2169 2170 2171 2172 2173 2174 2175
	kref_get(&map->ref);
}

static void mport_mm_close(struct vm_area_struct *vma)
{
	struct rio_mport_mapping *map = vma->vm_private_data;

2176
	rmcd_debug(MMAP, "%pad", &map->phys_addr);
2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245
	mutex_lock(&map->md->buf_mutex);
	kref_put(&map->ref, mport_release_mapping);
	mutex_unlock(&map->md->buf_mutex);
}

static const struct vm_operations_struct vm_ops = {
	.open =	mport_mm_open,
	.close = mport_mm_close,
};

static int mport_cdev_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct mport_dev *md;
	size_t size = vma->vm_end - vma->vm_start;
	dma_addr_t baddr;
	unsigned long offset;
	int found = 0, ret;
	struct rio_mport_mapping *map;

	rmcd_debug(MMAP, "0x%x bytes at offset 0x%lx",
		   (unsigned int)size, vma->vm_pgoff);

	md = priv->md;
	baddr = ((dma_addr_t)vma->vm_pgoff << PAGE_SHIFT);

	mutex_lock(&md->buf_mutex);
	list_for_each_entry(map, &md->mappings, node) {
		if (baddr >= map->phys_addr &&
		    baddr < (map->phys_addr + map->size)) {
			found = 1;
			break;
		}
	}
	mutex_unlock(&md->buf_mutex);

	if (!found)
		return -ENOMEM;

	offset = baddr - map->phys_addr;

	if (size + offset > map->size)
		return -EINVAL;

	vma->vm_pgoff = offset >> PAGE_SHIFT;
	rmcd_debug(MMAP, "MMAP adjusted offset = 0x%lx", vma->vm_pgoff);

	if (map->dir == MAP_INBOUND || map->dir == MAP_DMA)
		ret = dma_mmap_coherent(md->mport->dev.parent, vma,
				map->virt_addr, map->phys_addr, map->size);
	else if (map->dir == MAP_OUTBOUND) {
		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
		ret = vm_iomap_memory(vma, map->phys_addr, map->size);
	} else {
		rmcd_error("Attempt to mmap unsupported mapping type");
		ret = -EIO;
	}

	if (!ret) {
		vma->vm_private_data = map;
		vma->vm_ops = &vm_ops;
		mport_mm_open(vma);
	} else {
		rmcd_error("MMAP exit with err=%d", ret);
	}

	return ret;
}

2246
static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait)
2247 2248 2249 2250 2251
{
	struct mport_cdev_priv *priv = filp->private_data;

	poll_wait(filp, &priv->event_rx_wait, wait);
	if (kfifo_len(&priv->event_fifo))
2252
		return EPOLLIN | EPOLLRDNORM;
2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312

	return 0;
}

static ssize_t mport_read(struct file *filp, char __user *buf, size_t count,
			loff_t *ppos)
{
	struct mport_cdev_priv *priv = filp->private_data;
	int copied;
	ssize_t ret;

	if (!count)
		return 0;

	if (kfifo_is_empty(&priv->event_fifo) &&
	    (filp->f_flags & O_NONBLOCK))
		return -EAGAIN;

	if (count % sizeof(struct rio_event))
		return -EINVAL;

	ret = wait_event_interruptible(priv->event_rx_wait,
					kfifo_len(&priv->event_fifo) != 0);
	if (ret)
		return ret;

	while (ret < count) {
		if (kfifo_to_user(&priv->event_fifo, buf,
		      sizeof(struct rio_event), &copied))
			return -EFAULT;
		ret += copied;
		buf += copied;
	}

	return ret;
}

static ssize_t mport_write(struct file *filp, const char __user *buf,
			 size_t count, loff_t *ppos)
{
	struct mport_cdev_priv *priv = filp->private_data;
	struct rio_mport *mport = priv->md->mport;
	struct rio_event event;
	int len, ret;

	if (!count)
		return 0;

	if (count % sizeof(event))
		return -EINVAL;

	len = 0;
	while ((count - len) >= (int)sizeof(event)) {
		if (copy_from_user(&event, buf, sizeof(event)))
			return -EFAULT;

		if (event.header != RIO_DOORBELL)
			return -EINVAL;

		ret = rio_mport_send_doorbell(mport,
2313
					      event.u.doorbell.rioid,
2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359
					      event.u.doorbell.payload);
		if (ret < 0)
			return ret;

		len += sizeof(event);
		buf += sizeof(event);
	}

	return len;
}

static const struct file_operations mport_fops = {
	.owner		= THIS_MODULE,
	.open		= mport_cdev_open,
	.release	= mport_cdev_release,
	.poll		= mport_cdev_poll,
	.read		= mport_read,
	.write		= mport_write,
	.mmap		= mport_cdev_mmap,
	.fasync		= mport_cdev_fasync,
	.unlocked_ioctl = mport_cdev_ioctl
};

/*
 * Character device management
 */

static void mport_device_release(struct device *dev)
{
	struct mport_dev *md;

	rmcd_debug(EXIT, "%s", dev_name(dev));
	md = container_of(dev, struct mport_dev, dev);
	kfree(md);
}

/*
 * mport_cdev_add() - Create mport_dev from rio_mport
 * @mport:	RapidIO master port
 */
static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
{
	int ret = 0;
	struct mport_dev *md;
	struct rio_mport_attr attr;

2360
	md = kzalloc(sizeof(*md), GFP_KERNEL);
2361 2362 2363 2364 2365 2366 2367 2368 2369 2370
	if (!md) {
		rmcd_error("Unable allocate a device object");
		return NULL;
	}

	md->mport = mport;
	mutex_init(&md->buf_mutex);
	mutex_init(&md->file_mutex);
	INIT_LIST_HEAD(&md->file_list);

2371 2372
	device_initialize(&md->dev);
	md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
2373 2374 2375 2376 2377 2378
	md->dev.class = dev_class;
	md->dev.parent = &mport->dev;
	md->dev.release = mport_device_release;
	dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
	atomic_set(&md->active, 1);

2379 2380 2381 2382
	cdev_init(&md->cdev, &mport_fops);
	md->cdev.owner = THIS_MODULE;

	ret = cdev_device_add(&md->cdev, &md->dev);
2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401 2402
	if (ret) {
		rmcd_error("Failed to register mport %d (err=%d)",
		       mport->id, ret);
		goto err_cdev;
	}

	INIT_LIST_HEAD(&md->doorbells);
	spin_lock_init(&md->db_lock);
	INIT_LIST_HEAD(&md->portwrites);
	spin_lock_init(&md->pw_lock);
	INIT_LIST_HEAD(&md->mappings);

	md->properties.id = mport->id;
	md->properties.sys_size = mport->sys_size;
	md->properties.hdid = mport->host_deviceid;
	md->properties.index = mport->index;

	/* The transfer_mode property will be returned through mport query
	 * interface
	 */
2403
#ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432
	md->properties.transfer_mode |= RIO_TRANSFER_MODE_MAPPED;
#else
	md->properties.transfer_mode |= RIO_TRANSFER_MODE_TRANSFER;
#endif
	ret = rio_query_mport(mport, &attr);
	if (!ret) {
		md->properties.flags = attr.flags;
		md->properties.link_speed = attr.link_speed;
		md->properties.link_width = attr.link_width;
		md->properties.dma_max_sge = attr.dma_max_sge;
		md->properties.dma_max_size = attr.dma_max_size;
		md->properties.dma_align = attr.dma_align;
		md->properties.cap_sys_size = 0;
		md->properties.cap_transfer_mode = 0;
		md->properties.cap_addr_size = 0;
	} else
		pr_info(DRV_PREFIX "Failed to obtain info for %s cdev(%d:%d)\n",
			mport->name, MAJOR(dev_number), mport->id);

	mutex_lock(&mport_devs_lock);
	list_add_tail(&md->node, &mport_devs);
	mutex_unlock(&mport_devs_lock);

	pr_info(DRV_PREFIX "Added %s cdev(%d:%d)\n",
		mport->name, MAJOR(dev_number), mport->id);

	return md;

err_cdev:
2433
	put_device(&md->dev);
2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496
	return NULL;
}

/*
 * mport_cdev_terminate_dma() - Stop all active DMA data transfers and release
 *                              associated DMA channels.
 */
static void mport_cdev_terminate_dma(struct mport_dev *md)
{
#ifdef CONFIG_RAPIDIO_DMA_ENGINE
	struct mport_cdev_priv *client;

	rmcd_debug(DMA, "%s", dev_name(&md->dev));

	mutex_lock(&md->file_mutex);
	list_for_each_entry(client, &md->file_list, list) {
		if (client->dmach) {
			dmaengine_terminate_all(client->dmach);
			rio_release_dma(client->dmach);
		}
	}
	mutex_unlock(&md->file_mutex);

	if (md->dma_chan) {
		dmaengine_terminate_all(md->dma_chan);
		rio_release_dma(md->dma_chan);
		md->dma_chan = NULL;
	}
#endif
}


/*
 * mport_cdev_kill_fasync() - Send SIGIO signal to all processes with open
 *                            mport_cdev files.
 */
static int mport_cdev_kill_fasync(struct mport_dev *md)
{
	unsigned int files = 0;
	struct mport_cdev_priv *client;

	mutex_lock(&md->file_mutex);
	list_for_each_entry(client, &md->file_list, list) {
		if (client->async_queue)
			kill_fasync(&client->async_queue, SIGIO, POLL_HUP);
		files++;
	}
	mutex_unlock(&md->file_mutex);
	return files;
}

/*
 * mport_cdev_remove() - Remove mport character device
 * @dev:	Mport device to remove
 */
static void mport_cdev_remove(struct mport_dev *md)
{
	struct rio_mport_mapping *map, *_map;

	rmcd_debug(EXIT, "Remove %s cdev", md->mport->name);
	atomic_set(&md->active, 0);
	mport_cdev_terminate_dma(md);
	rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
2497
	cdev_device_del(&md->cdev, &md->dev);
2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597
	mport_cdev_kill_fasync(md);

	/* TODO: do we need to give clients some time to close file
	 * descriptors? Simple wait for XX, or kref?
	 */

	/*
	 * Release DMA buffers allocated for the mport device.
	 * Disable associated inbound Rapidio requests mapping if applicable.
	 */
	mutex_lock(&md->buf_mutex);
	list_for_each_entry_safe(map, _map, &md->mappings, node) {
		kref_put(&map->ref, mport_release_mapping);
	}
	mutex_unlock(&md->buf_mutex);

	if (!list_empty(&md->mappings))
		rmcd_warn("WARNING: %s pending mappings on removal",
			  md->mport->name);

	rio_release_inb_dbell(md->mport, 0, 0x0fff);

	put_device(&md->dev);
}

/*
 * RIO rio_mport_interface driver
 */

/*
 * mport_add_mport() - Add rio_mport from LDM device struct
 * @dev:		Linux device model struct
 * @class_intf:	Linux class_interface
 */
static int mport_add_mport(struct device *dev,
		struct class_interface *class_intf)
{
	struct rio_mport *mport = NULL;
	struct mport_dev *chdev = NULL;

	mport = to_rio_mport(dev);
	if (!mport)
		return -ENODEV;

	chdev = mport_cdev_add(mport);
	if (!chdev)
		return -ENODEV;

	return 0;
}

/*
 * mport_remove_mport() - Remove rio_mport from global list
 * TODO remove device from global mport_dev list
 */
static void mport_remove_mport(struct device *dev,
		struct class_interface *class_intf)
{
	struct rio_mport *mport = NULL;
	struct mport_dev *chdev;
	int found = 0;

	mport = to_rio_mport(dev);
	rmcd_debug(EXIT, "Remove %s", mport->name);

	mutex_lock(&mport_devs_lock);
	list_for_each_entry(chdev, &mport_devs, node) {
		if (chdev->mport->id == mport->id) {
			atomic_set(&chdev->active, 0);
			list_del(&chdev->node);
			found = 1;
			break;
		}
	}
	mutex_unlock(&mport_devs_lock);

	if (found)
		mport_cdev_remove(chdev);
}

/* the rio_mport_interface is used to handle local mport devices */
static struct class_interface rio_mport_interface __refdata = {
	.class		= &rio_mport_class,
	.add_dev	= mport_add_mport,
	.remove_dev	= mport_remove_mport,
};

/*
 * Linux kernel module
 */

/*
 * mport_init - Driver module loading
 */
static int __init mport_init(void)
{
	int ret;

	/* Create device class needed by udev */
	dev_class = class_create(THIS_MODULE, DRV_NAME);
2598
	if (IS_ERR(dev_class)) {
2599
		rmcd_error("Unable to create " DRV_NAME " class");
2600
		return PTR_ERR(dev_class);
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	}

	ret = alloc_chrdev_region(&dev_number, 0, RIO_MAX_MPORTS, DRV_NAME);
	if (ret < 0)
		goto err_chr;

	rmcd_debug(INIT, "Registered class with major=%d", MAJOR(dev_number));

	/* Register to rio_mport_interface */
	ret = class_interface_register(&rio_mport_interface);
	if (ret) {
		rmcd_error("class_interface_register() failed, err=%d", ret);
		goto err_cli;
	}

	return 0;

err_cli:
	unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
err_chr:
	class_destroy(dev_class);
	return ret;
}

/**
 * mport_exit - Driver module unloading
 */
static void __exit mport_exit(void)
{
	class_interface_unregister(&rio_mport_interface);
	class_destroy(dev_class);
	unregister_chrdev_region(dev_number, RIO_MAX_MPORTS);
}

module_init(mport_init);
module_exit(mport_exit);