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OpenCloudOS-Kernel/drivers/rapidio/devices/rio_mport_cdev.c

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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>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*/
#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;
u16 rioid;
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;
u64 length;
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;
u32 event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
#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) ||
(maint_io.length == 0) || (maint_io.length % 4) ||
(maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
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;
}
if (unlikely(copy_to_user((void __user *)(uintptr_t)maint_io.buffer,
buffer, maint_io.length)))
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) ||
(maint_io.length == 0) || (maint_io.length % 4) ||
(maint_io.length + maint_io.offset) > RIO_MAINT_SPACE_SZ)
return -EINVAL;
buffer = vmalloc(maint_io.length);
if (buffer == NULL)
return -ENOMEM;
length = maint_io.length;
if (unlikely(copy_from_user(buffer,
(void __user *)(uintptr_t)maint_io.buffer, length))) {
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,
u16 rioid, u64 raddr, u32 size,
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);
map = kzalloc(sizeof(*map), GFP_KERNEL);
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,
u16 rioid, u64 raddr, u32 size,
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;
if (unlikely(copy_from_user(&map, arg, sizeof(map))))
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;
if (unlikely(copy_to_user(arg, &map, sizeof(map))))
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;
if (copy_from_user(&handle, arg, sizeof(handle)))
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;
u16 hdid;
if (copy_from_user(&hdid, arg, sizeof(hdid)))
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;
u32 comptag;
if (copy_from_user(&comptag, arg, sizeof(comptag)))
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 {
struct kref refcount;
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);
}
static void dma_req_free(struct kref *ref)
{
struct mport_dma_req *req = container_of(ref, struct mport_dma_req,
refcount);
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);
kref_put(&req->refcount, dma_req_free);
}
/*
* 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;
}
tx->callback = dma_xfer_callback;
tx->callback_param = req;
req->status = DMA_IN_PROGRESS;
kref_get(&req->refcount);
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);
kref_put(&req->refcount, dma_req_free);
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
rio_dma_transfer(struct file *filp, u32 transfer_mode,
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;
}
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;
/*
* 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) {
unsigned int offset;
long pinned;
offset = lower_32_bits(offset_in_page(xfer->loc_addr));
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;
}
pinned = get_user_pages_fast(
(unsigned long)xfer->loc_addr & PAGE_MASK,
nr_pages, dir == DMA_FROM_DEVICE, page_list);
if (pinned != nr_pages) {
if (pinned < 0) {
rmcd_error("get_user_pages_unlocked err=%ld",
pinned);
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);
if (nents == 0) {
rmcd_error("Failed to map SG list");
ret = -EFAULT;
goto err_pg;
}
ret = do_dma_request(req, xfer, sync, nents);
if (ret >= 0) {
if (sync == RIO_TRANSFER_ASYNC)
return ret; /* return ASYNC cookie */
} else {
rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
}
err_pg:
if (!req->page_list) {
for (i = 0; i < nr_pages; i++)
put_page(page_list[i]);
kfree(page_list);
}
err_req:
kref_put(&req->refcount, dma_req_free);
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;
if (transaction.count != 1) /* only single transfer for now */
return -EINVAL;
if ((transaction.transfer_mode &
priv->md->properties.transfer_mode) == 0)
return -ENODEV;
transfer = vmalloc(array_size(sizeof(*transfer), transaction.count));
if (!transfer)
return -ENOMEM;
if (unlikely(copy_from_user(transfer,
(void __user *)(uintptr_t)transaction.block,
transaction.count * sizeof(*transfer)))) {
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]);
if (unlikely(copy_to_user((void __user *)(uintptr_t)transaction.block,
transfer,
transaction.count * sizeof(*transfer))))
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)
kref_put(&req->refcount, dma_req_free);
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,
u64 size, struct rio_mport_mapping **mapping)
{
struct rio_mport_mapping *map;
map = kzalloc(sizeof(*map), GFP_KERNEL);
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;
if (unlikely(copy_from_user(&map, arg, sizeof(map))))
return -EFAULT;
ret = rio_mport_create_dma_mapping(md, filp, map.length, &mapping);
if (ret)
return ret;
map.dma_handle = mapping->phys_addr;
if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
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;
if (copy_from_user(&handle, arg, sizeof(handle)))
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,
u64 raddr, u64 size,
struct rio_mport_mapping **mapping)
{
struct rio_mport *mport = md->mport;
struct rio_mport_mapping *map;
int ret;
/* rio_map_inb_region() accepts u32 size */
if (size > 0xffffffff)
return -EINVAL;
map = kzalloc(sizeof(*map), GFP_KERNEL);
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;
ret = rio_map_inb_region(mport, map->phys_addr, raddr, (u32)size, 0);
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,
u64 raddr, u64 size,
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;
if (unlikely(copy_from_user(&map, arg, sizeof(map))))
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;
if (unlikely(copy_to_user(arg, &map, sizeof(map)))) {
/* 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;
if (copy_from_user(&handle, arg, sizeof(handle)))
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;
u32 port_idx = md->mport->index;
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) {
if (((db_filter->filter.rioid == RIO_INVALID_DESTID ||
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;
if (filter.low > filter.high)
return -EINVAL;
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;
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;
}
size = sizeof(*rdev);
mport = md->mport;
destid = dev_info.destid;
hopcount = dev_info.hopcount;
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,
hopcount, &rdev->phys_rmap);
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;
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 &&
rdev->destid == dev_info.destid &&
rdev->hopcount == dev_info.hopcount)
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);
kref_put(&req->refcount, dma_req_free);
}
}
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;
if (copy_to_user((void __user *)arg, &(md->properties),
sizeof(md->properties)))
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:
data->event_mask = (u32)arg;
return 0;
case RIO_GET_EVENT_MASK:
if (copy_to_user((void __user *)arg, &data->event_mask,
sizeof(u32)))
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);
/* fall through */
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;
rmcd_debug(MMAP, "%pad", &map->phys_addr);
kref_get(&map->ref);
}
static void mport_mm_close(struct vm_area_struct *vma)
{
struct rio_mport_mapping *map = vma->vm_private_data;
rmcd_debug(MMAP, "%pad", &map->phys_addr);
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;
}
static __poll_t mport_cdev_poll(struct file *filp, poll_table *wait)
{
struct mport_cdev_priv *priv = filp->private_data;
poll_wait(filp, &priv->event_rx_wait, wait);
if (kfifo_len(&priv->event_fifo))
return EPOLLIN | EPOLLRDNORM;
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,
event.u.doorbell.rioid,
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;
md = kzalloc(sizeof(*md), GFP_KERNEL);
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);
device_initialize(&md->dev);
md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
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);
cdev_init(&md->cdev, &mport_fops);
md->cdev.owner = THIS_MODULE;
ret = cdev_device_add(&md->cdev, &md->dev);
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
*/
#ifdef CONFIG_FSL_RIO /* for now: only on Freescale's SoCs */
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:
put_device(&md->dev);
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);
cdev_device_del(&md->cdev, &md->dev);
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);
if (IS_ERR(dev_class)) {
rmcd_error("Unable to create " DRV_NAME " class");
return PTR_ERR(dev_class);
}
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);
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