| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Alex Bounine | 12315 | 98.52% | 3 | 18.75% |
| Ioan Nicu | 111 | 0.89% | 2 | 12.50% |
| Logan Gunthorpe | 37 | 0.30% | 1 | 6.25% |
| Christophe Jaillet | 7 | 0.06% | 2 | 12.50% |
| Tvrtko A. Ursulin | 7 | 0.06% | 1 | 6.25% |
| Vladimir Zapolskiy | 7 | 0.06% | 1 | 6.25% |
| Kees Cook | 7 | 0.06% | 1 | 6.25% |
| Al Viro | 4 | 0.03% | 2 | 12.50% |
| Joe Perches | 2 | 0.02% | 1 | 6.25% |
| Linus Torvalds | 2 | 0.02% | 1 | 6.25% |
| Lorenzo Stoakes | 1 | 0.01% | 1 | 6.25% |
| Total | 12500 | 16 |
/* * 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); 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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