2721 lines
67 KiB
C
2721 lines
67 KiB
C
/*
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* RapidIO mport character device
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*
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* Copyright 2014-2015 Integrated Device Technology, Inc.
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* Alexandre Bounine <alexandre.bounine@idt.com>
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* Copyright 2014-2015 Prodrive Technologies
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* Andre van Herk <andre.van.herk@prodrive-technologies.com>
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* Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>
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* Copyright (C) 2014 Texas Instruments Incorporated
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* Aurelien Jacquiot <a-jacquiot@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/cdev.h>
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#include <linux/ioctl.h>
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#include <linux/uaccess.h>
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#include <linux/list.h>
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#include <linux/fs.h>
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#include <linux/err.h>
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#include <linux/net.h>
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#include <linux/poll.h>
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#include <linux/spinlock.h>
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#include <linux/sched.h>
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#include <linux/kfifo.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/mman.h>
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#include <linux/dma-mapping.h>
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#ifdef CONFIG_RAPIDIO_DMA_ENGINE
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#include <linux/dmaengine.h>
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#endif
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#include <linux/rio.h>
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#include <linux/rio_ids.h>
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#include <linux/rio_drv.h>
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#include <linux/rio_mport_cdev.h>
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#include "../rio.h"
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#define DRV_NAME "rio_mport"
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#define DRV_PREFIX DRV_NAME ": "
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#define DEV_NAME "rio_mport"
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#define DRV_VERSION "1.0.0"
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/* Debug output filtering masks */
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enum {
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DBG_NONE = 0,
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DBG_INIT = BIT(0), /* driver init */
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DBG_EXIT = BIT(1), /* driver exit */
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DBG_MPORT = BIT(2), /* mport add/remove */
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DBG_RDEV = BIT(3), /* RapidIO device add/remove */
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DBG_DMA = BIT(4), /* DMA transfer messages */
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DBG_MMAP = BIT(5), /* mapping messages */
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DBG_IBW = BIT(6), /* inbound window */
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DBG_EVENT = BIT(7), /* event handling messages */
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DBG_OBW = BIT(8), /* outbound window messages */
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DBG_DBELL = BIT(9), /* doorbell messages */
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DBG_ALL = ~0,
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};
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#ifdef DEBUG
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#define rmcd_debug(level, fmt, arg...) \
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do { \
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if (DBG_##level & dbg_level) \
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pr_debug(DRV_PREFIX "%s: " fmt "\n", __func__, ##arg); \
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} while (0)
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#else
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#define rmcd_debug(level, fmt, arg...) \
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no_printk(KERN_DEBUG pr_fmt(DRV_PREFIX fmt "\n"), ##arg)
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#endif
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#define rmcd_warn(fmt, arg...) \
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pr_warn(DRV_PREFIX "%s WARNING " fmt "\n", __func__, ##arg)
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#define rmcd_error(fmt, arg...) \
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pr_err(DRV_PREFIX "%s ERROR " fmt "\n", __func__, ##arg)
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MODULE_AUTHOR("Jerry Jacobs <jerry.jacobs@prodrive-technologies.com>");
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MODULE_AUTHOR("Aurelien Jacquiot <a-jacquiot@ti.com>");
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MODULE_AUTHOR("Alexandre Bounine <alexandre.bounine@idt.com>");
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MODULE_AUTHOR("Andre van Herk <andre.van.herk@prodrive-technologies.com>");
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MODULE_DESCRIPTION("RapidIO mport character device driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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static int dma_timeout = 3000; /* DMA transfer timeout in msec */
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module_param(dma_timeout, int, S_IRUGO);
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MODULE_PARM_DESC(dma_timeout, "DMA Transfer Timeout in msec (default: 3000)");
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#ifdef DEBUG
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static u32 dbg_level = DBG_NONE;
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module_param(dbg_level, uint, S_IWUSR | S_IWGRP | S_IRUGO);
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MODULE_PARM_DESC(dbg_level, "Debugging output level (default 0 = none)");
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#endif
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/*
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* An internal DMA coherent buffer
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*/
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struct mport_dma_buf {
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void *ib_base;
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dma_addr_t ib_phys;
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u32 ib_size;
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u64 ib_rio_base;
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bool ib_map;
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struct file *filp;
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};
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/*
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* Internal memory mapping structure
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*/
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enum rio_mport_map_dir {
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MAP_INBOUND,
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MAP_OUTBOUND,
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MAP_DMA,
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};
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struct rio_mport_mapping {
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struct list_head node;
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struct mport_dev *md;
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enum rio_mport_map_dir dir;
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u32 rioid;
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u64 rio_addr;
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dma_addr_t phys_addr; /* for mmap */
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void *virt_addr; /* kernel address, for dma_free_coherent */
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u64 size;
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struct kref ref; /* refcount of vmas sharing the mapping */
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struct file *filp;
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};
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struct rio_mport_dma_map {
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int valid;
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uint64_t length;
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void *vaddr;
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dma_addr_t paddr;
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};
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#define MPORT_MAX_DMA_BUFS 16
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#define MPORT_EVENT_DEPTH 10
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/*
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* mport_dev driver-specific structure that represents mport device
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* @active mport device status flag
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* @node list node to maintain list of registered mports
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* @cdev character device
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* @dev associated device object
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* @mport associated subsystem's master port device object
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* @buf_mutex lock for buffer handling
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* @file_mutex - lock for open files list
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* @file_list - list of open files on given mport
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* @properties properties of this mport
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* @portwrites queue of inbound portwrites
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* @pw_lock lock for port write queue
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* @mappings queue for memory mappings
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* @dma_chan DMA channels associated with this device
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* @dma_ref:
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* @comp:
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*/
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struct mport_dev {
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atomic_t active;
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struct list_head node;
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struct cdev cdev;
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struct device dev;
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struct rio_mport *mport;
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struct mutex buf_mutex;
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struct mutex file_mutex;
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struct list_head file_list;
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struct rio_mport_properties properties;
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struct list_head doorbells;
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spinlock_t db_lock;
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struct list_head portwrites;
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spinlock_t pw_lock;
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struct list_head mappings;
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#ifdef CONFIG_RAPIDIO_DMA_ENGINE
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struct dma_chan *dma_chan;
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struct kref dma_ref;
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struct completion comp;
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#endif
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};
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/*
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* mport_cdev_priv - data structure specific to individual file object
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* associated with an open device
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* @md master port character device object
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* @async_queue - asynchronous notification queue
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* @list - file objects tracking list
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* @db_filters inbound doorbell filters for this descriptor
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* @pw_filters portwrite filters for this descriptor
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* @event_fifo event fifo for this descriptor
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* @event_rx_wait wait queue for this descriptor
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* @fifo_lock lock for event_fifo
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* @event_mask event mask for this descriptor
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* @dmach DMA engine channel allocated for specific file object
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*/
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struct mport_cdev_priv {
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struct mport_dev *md;
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struct fasync_struct *async_queue;
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struct list_head list;
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struct list_head db_filters;
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struct list_head pw_filters;
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struct kfifo event_fifo;
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wait_queue_head_t event_rx_wait;
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spinlock_t fifo_lock;
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unsigned int event_mask; /* RIO_DOORBELL, RIO_PORTWRITE */
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#ifdef CONFIG_RAPIDIO_DMA_ENGINE
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struct dma_chan *dmach;
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struct list_head async_list;
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struct list_head pend_list;
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spinlock_t req_lock;
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struct mutex dma_lock;
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struct kref dma_ref;
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struct completion comp;
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#endif
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};
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/*
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* rio_mport_pw_filter - structure to describe a portwrite filter
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* md_node node in mport device's list
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* priv_node node in private file object's list
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* priv reference to private data
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* filter actual portwrite filter
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*/
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struct rio_mport_pw_filter {
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struct list_head md_node;
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struct list_head priv_node;
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struct mport_cdev_priv *priv;
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struct rio_pw_filter filter;
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};
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/*
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* rio_mport_db_filter - structure to describe a doorbell filter
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* @data_node reference to device node
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* @priv_node node in private data
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* @priv reference to private data
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* @filter actual doorbell filter
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*/
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struct rio_mport_db_filter {
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struct list_head data_node;
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struct list_head priv_node;
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struct mport_cdev_priv *priv;
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struct rio_doorbell_filter filter;
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};
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static LIST_HEAD(mport_devs);
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static DEFINE_MUTEX(mport_devs_lock);
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#if (0) /* used by commented out portion of poll function : FIXME */
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static DECLARE_WAIT_QUEUE_HEAD(mport_cdev_wait);
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#endif
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static struct class *dev_class;
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static dev_t dev_number;
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static struct workqueue_struct *dma_wq;
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static void mport_release_mapping(struct kref *ref);
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static int rio_mport_maint_rd(struct mport_cdev_priv *priv, void __user *arg,
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int local)
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{
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struct rio_mport *mport = priv->md->mport;
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struct rio_mport_maint_io maint_io;
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u32 *buffer;
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u32 offset;
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size_t length;
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int ret, i;
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if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
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return -EFAULT;
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if ((maint_io.offset % 4) ||
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(maint_io.length == 0) || (maint_io.length % 4))
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return -EINVAL;
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buffer = vmalloc(maint_io.length);
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if (buffer == NULL)
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return -ENOMEM;
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length = maint_io.length/sizeof(u32);
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offset = maint_io.offset;
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for (i = 0; i < length; i++) {
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if (local)
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ret = __rio_local_read_config_32(mport,
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offset, &buffer[i]);
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else
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ret = rio_mport_read_config_32(mport, maint_io.rioid,
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maint_io.hopcount, offset, &buffer[i]);
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if (ret)
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goto out;
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offset += 4;
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}
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if (unlikely(copy_to_user(maint_io.buffer, buffer, maint_io.length)))
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ret = -EFAULT;
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out:
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vfree(buffer);
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return ret;
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}
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static int rio_mport_maint_wr(struct mport_cdev_priv *priv, void __user *arg,
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int local)
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{
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struct rio_mport *mport = priv->md->mport;
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struct rio_mport_maint_io maint_io;
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u32 *buffer;
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u32 offset;
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size_t length;
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int ret = -EINVAL, i;
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if (unlikely(copy_from_user(&maint_io, arg, sizeof(maint_io))))
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return -EFAULT;
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if ((maint_io.offset % 4) ||
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(maint_io.length == 0) || (maint_io.length % 4))
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return -EINVAL;
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buffer = vmalloc(maint_io.length);
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if (buffer == NULL)
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return -ENOMEM;
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length = maint_io.length;
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if (unlikely(copy_from_user(buffer, maint_io.buffer, length))) {
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ret = -EFAULT;
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goto out;
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}
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offset = maint_io.offset;
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length /= sizeof(u32);
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for (i = 0; i < length; i++) {
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if (local)
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ret = __rio_local_write_config_32(mport,
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offset, buffer[i]);
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else
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ret = rio_mport_write_config_32(mport, maint_io.rioid,
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maint_io.hopcount,
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offset, buffer[i]);
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if (ret)
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goto out;
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offset += 4;
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}
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out:
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vfree(buffer);
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return ret;
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}
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/*
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* Inbound/outbound memory mapping functions
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*/
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static int
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rio_mport_create_outbound_mapping(struct mport_dev *md, struct file *filp,
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u32 rioid, u64 raddr, u32 size,
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dma_addr_t *paddr)
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{
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struct rio_mport *mport = md->mport;
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struct rio_mport_mapping *map;
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int ret;
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rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%x", rioid, raddr, size);
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map = kzalloc(sizeof(struct rio_mport_mapping), GFP_KERNEL);
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if (map == NULL)
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return -ENOMEM;
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ret = rio_map_outb_region(mport, rioid, raddr, size, 0, paddr);
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if (ret < 0)
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goto err_map_outb;
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map->dir = MAP_OUTBOUND;
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map->rioid = rioid;
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map->rio_addr = raddr;
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map->size = size;
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map->phys_addr = *paddr;
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map->filp = filp;
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map->md = md;
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kref_init(&map->ref);
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list_add_tail(&map->node, &md->mappings);
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return 0;
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err_map_outb:
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kfree(map);
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return ret;
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}
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static int
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rio_mport_get_outbound_mapping(struct mport_dev *md, struct file *filp,
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u32 rioid, u64 raddr, u32 size,
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dma_addr_t *paddr)
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{
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struct rio_mport_mapping *map;
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int err = -ENOMEM;
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mutex_lock(&md->buf_mutex);
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list_for_each_entry(map, &md->mappings, node) {
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if (map->dir != MAP_OUTBOUND)
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continue;
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if (rioid == map->rioid &&
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raddr == map->rio_addr && size == map->size) {
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*paddr = map->phys_addr;
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err = 0;
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break;
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} else if (rioid == map->rioid &&
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raddr < (map->rio_addr + map->size - 1) &&
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(raddr + size) > map->rio_addr) {
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err = -EBUSY;
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break;
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}
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}
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/* If not found, create new */
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if (err == -ENOMEM)
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err = rio_mport_create_outbound_mapping(md, filp, rioid, raddr,
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size, paddr);
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mutex_unlock(&md->buf_mutex);
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return err;
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}
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static int rio_mport_obw_map(struct file *filp, void __user *arg)
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{
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struct mport_cdev_priv *priv = filp->private_data;
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struct mport_dev *data = priv->md;
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struct rio_mmap map;
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dma_addr_t paddr;
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int ret;
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if (unlikely(copy_from_user(&map, arg, sizeof(struct rio_mmap))))
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return -EFAULT;
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rmcd_debug(OBW, "did=%d ra=0x%llx sz=0x%llx",
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map.rioid, map.rio_addr, map.length);
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ret = rio_mport_get_outbound_mapping(data, filp, map.rioid,
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map.rio_addr, map.length, &paddr);
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if (ret < 0) {
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rmcd_error("Failed to set OBW err= %d", ret);
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return ret;
|
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}
|
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|
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map.handle = paddr;
|
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|
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if (unlikely(copy_to_user(arg, &map, sizeof(struct rio_mmap))))
|
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return -EFAULT;
|
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return 0;
|
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}
|
|
|
|
/*
|
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* rio_mport_obw_free() - unmap an OutBound Window from RapidIO address space
|
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*
|
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* @priv: driver private data
|
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* @arg: buffer handle returned by allocation routine
|
|
*/
|
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static int rio_mport_obw_free(struct file *filp, void __user *arg)
|
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{
|
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struct mport_cdev_priv *priv = filp->private_data;
|
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struct mport_dev *md = priv->md;
|
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u64 handle;
|
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struct rio_mport_mapping *map, *_map;
|
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|
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if (!md->mport->ops->unmap_outb)
|
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return -EPROTONOSUPPORT;
|
|
|
|
if (copy_from_user(&handle, arg, sizeof(u64)))
|
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return -EFAULT;
|
|
|
|
rmcd_debug(OBW, "h=0x%llx", handle);
|
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|
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mutex_lock(&md->buf_mutex);
|
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list_for_each_entry_safe(map, _map, &md->mappings, node) {
|
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if (map->dir == MAP_OUTBOUND && map->phys_addr == handle) {
|
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if (map->filp == filp) {
|
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rmcd_debug(OBW, "kref_put h=0x%llx", handle);
|
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map->filp = NULL;
|
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kref_put(&map->ref, mport_release_mapping);
|
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}
|
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break;
|
|
}
|
|
}
|
|
mutex_unlock(&md->buf_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* maint_hdid_set() - Set the host Device ID
|
|
* @priv: driver private data
|
|
* @arg: Device Id
|
|
*/
|
|
static int maint_hdid_set(struct mport_cdev_priv *priv, void __user *arg)
|
|
{
|
|
struct mport_dev *md = priv->md;
|
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uint16_t hdid;
|
|
|
|
if (copy_from_user(&hdid, arg, sizeof(uint16_t)))
|
|
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;
|
|
uint32_t comptag;
|
|
|
|
if (copy_from_user(&comptag, arg, sizeof(uint32_t)))
|
|
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 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;
|
|
};
|
|
|
|
struct mport_faf_work {
|
|
struct work_struct work;
|
|
struct mport_dma_req *req;
|
|
};
|
|
|
|
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 mport_dma_req *req)
|
|
{
|
|
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);
|
|
}
|
|
|
|
static void dma_faf_cleanup(struct work_struct *_work)
|
|
{
|
|
struct mport_faf_work *work = container_of(_work,
|
|
struct mport_faf_work, work);
|
|
struct mport_dma_req *req = work->req;
|
|
|
|
dma_req_free(req);
|
|
kfree(work);
|
|
}
|
|
|
|
static void dma_faf_callback(void *param)
|
|
{
|
|
struct mport_dma_req *req = (struct mport_dma_req *)param;
|
|
struct mport_faf_work *work;
|
|
|
|
work = kmalloc(sizeof(*work), GFP_ATOMIC);
|
|
if (!work)
|
|
return;
|
|
|
|
INIT_WORK(&work->work, dma_faf_cleanup);
|
|
work->req = req;
|
|
queue_work(dma_wq, &work->work);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
if (sync == RIO_TRANSFER_FAF)
|
|
tx->callback = dma_faf_callback;
|
|
else
|
|
tx->callback = dma_xfer_callback;
|
|
tx->callback_param = req;
|
|
|
|
req->dmach = chan;
|
|
req->sync = sync;
|
|
req->status = DMA_IN_PROGRESS;
|
|
init_completion(&req->req_comp);
|
|
|
|
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);
|
|
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, uint32_t 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;
|
|
}
|
|
|
|
/*
|
|
* 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 long offset;
|
|
long pinned;
|
|
|
|
offset = (unsigned long)xfer->loc_addr & ~PAGE_MASK;
|
|
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;
|
|
}
|
|
|
|
down_read(¤t->mm->mmap_sem);
|
|
pinned = get_user_pages(
|
|
(unsigned long)xfer->loc_addr & PAGE_MASK,
|
|
nr_pages, dir == DMA_FROM_DEVICE, 0,
|
|
page_list, NULL);
|
|
up_read(¤t->mm->mmap_sem);
|
|
|
|
if (pinned != nr_pages) {
|
|
if (pinned < 0) {
|
|
rmcd_error("get_user_pages 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);
|
|
}
|
|
|
|
req->dir = dir;
|
|
req->filp = filp;
|
|
req->priv = priv;
|
|
chan = priv->dmach;
|
|
|
|
nents = dma_map_sg(chan->device->dev,
|
|
req->sgt.sgl, req->sgt.nents, dir);
|
|
if (nents == -EFAULT) {
|
|
rmcd_error("Failed to map SG list");
|
|
return -EFAULT;
|
|
}
|
|
|
|
ret = do_dma_request(req, xfer, sync, nents);
|
|
|
|
if (ret >= 0) {
|
|
if (sync == RIO_TRANSFER_SYNC)
|
|
goto sync_out;
|
|
return ret; /* return ASYNC cookie */
|
|
}
|
|
|
|
if (ret == -ETIMEDOUT || ret == -EINTR) {
|
|
/*
|
|
* This can happen only in case of SYNC transfer.
|
|
* Do not free unfinished request structure immediately.
|
|
* Place it into pending list and deal with it later
|
|
*/
|
|
spin_lock(&priv->req_lock);
|
|
list_add_tail(&req->node, &priv->pend_list);
|
|
spin_unlock(&priv->req_lock);
|
|
return ret;
|
|
}
|
|
|
|
|
|
rmcd_debug(DMA, "do_dma_request failed with err=%d", ret);
|
|
sync_out:
|
|
dma_unmap_sg(chan->device->dev, req->sgt.sgl, req->sgt.nents, dir);
|
|
sg_free_table(&req->sgt);
|
|
err_pg:
|
|
if (page_list) {
|
|
for (i = 0; i < nr_pages; i++)
|
|
put_page(page_list[i]);
|
|
kfree(page_list);
|
|
}
|
|
err_req:
|
|
if (req->map) {
|
|
mutex_lock(&md->buf_mutex);
|
|
kref_put(&req->map->ref, mport_release_mapping);
|
|
mutex_unlock(&md->buf_mutex);
|
|
}
|
|
put_dma_channel(priv);
|
|
kfree(req);
|
|
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)
|
|
return -EINVAL;
|
|
|
|
if ((transaction.transfer_mode &
|
|
priv->md->properties.transfer_mode) == 0)
|
|
return -ENODEV;
|
|
|
|
transfer = vmalloc(transaction.count * sizeof(struct rio_transfer_io));
|
|
if (!transfer)
|
|
return -ENOMEM;
|
|
|
|
if (unlikely(copy_from_user(transfer, transaction.block,
|
|
transaction.count * sizeof(struct rio_transfer_io)))) {
|
|
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(transaction.block, transfer,
|
|
transaction.count * sizeof(struct rio_transfer_io))))
|
|
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 mport_dev *md;
|
|
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;
|
|
md = priv->md;
|
|
|
|
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)
|
|
dma_req_free(req);
|
|
|
|
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,
|
|
uint64_t size, struct rio_mport_mapping **mapping)
|
|
{
|
|
struct rio_mport_mapping *map;
|
|
|
|
map = kzalloc(sizeof(struct rio_mport_mapping), 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(struct rio_dma_mem))))
|
|
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(struct rio_dma_mem)))) {
|
|
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(u64)))
|
|
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, u32 size,
|
|
struct rio_mport_mapping **mapping)
|
|
{
|
|
struct rio_mport *mport = md->mport;
|
|
struct rio_mport_mapping *map;
|
|
int ret;
|
|
|
|
map = kzalloc(sizeof(struct rio_mport_mapping), 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, 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, u32 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(struct rio_mmap))))
|
|
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(struct rio_mmap)))) {
|
|
/* 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(u64)))
|
|
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;
|
|
uint32_t 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 == 0xffffffff ||
|
|
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;
|
|
|
|
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(struct rio_dev);
|
|
mport = md->mport;
|
|
destid = (u16)dev_info.destid;
|
|
hopcount = (u8)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->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 == (u16)dev_info.destid &&
|
|
rdev->hopcount == (u8)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);
|
|
INIT_LIST_HEAD(&priv->pend_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;
|
|
|
|
flush_workqueue(dma_wq);
|
|
|
|
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);
|
|
dma_req_free(req);
|
|
}
|
|
}
|
|
|
|
if (!list_empty(&priv->pend_list)) {
|
|
rmcd_debug(EXIT, "Free pending DMA requests for filp=%p %s(%d)",
|
|
filp, current->comm, task_pid_nr(current));
|
|
list_for_each_entry_safe(req,
|
|
req_next, &priv->pend_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);
|
|
dma_req_free(req);
|
|
}
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
spin_lock(&priv->req_lock);
|
|
|
|
if (!list_empty(&priv->pend_list)) {
|
|
rmcd_debug(EXIT, "ATTN: pending DMA requests, filp=%p %s(%d)",
|
|
filp, current->comm, task_pid_nr(current));
|
|
}
|
|
|
|
spin_unlock(&priv->req_lock);
|
|
|
|
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, &(data->md->properties),
|
|
sizeof(data->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 = arg;
|
|
return 0;
|
|
case RIO_GET_EVENT_MASK:
|
|
if (copy_to_user((void __user *)arg, &data->event_mask,
|
|
sizeof(data->event_mask)))
|
|
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, "0x%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, "0x%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 unsigned int 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 POLLIN | POLLRDNORM;
|
|
|
|
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,
|
|
(u16)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(struct mport_dev), 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);
|
|
cdev_init(&md->cdev, &mport_fops);
|
|
md->cdev.owner = THIS_MODULE;
|
|
ret = cdev_add(&md->cdev, MKDEV(MAJOR(dev_number), mport->id), 1);
|
|
if (ret < 0) {
|
|
kfree(md);
|
|
rmcd_error("Unable to register a device, err=%d", ret);
|
|
return NULL;
|
|
}
|
|
|
|
md->dev.devt = md->cdev.dev;
|
|
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);
|
|
|
|
ret = device_register(&md->dev);
|
|
if (ret) {
|
|
rmcd_error("Failed to register mport %d (err=%d)",
|
|
mport->id, ret);
|
|
goto err_cdev;
|
|
}
|
|
|
|
get_device(&md->dev);
|
|
|
|
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_PPC /* 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:
|
|
cdev_del(&md->cdev);
|
|
kfree(md);
|
|
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_del(&(md->cdev));
|
|
mport_cdev_kill_fasync(md);
|
|
|
|
flush_workqueue(dma_wq);
|
|
|
|
/* 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);
|
|
|
|
device_unregister(&md->dev);
|
|
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;
|
|
}
|
|
|
|
dma_wq = create_singlethread_workqueue("dma_wq");
|
|
if (!dma_wq) {
|
|
rmcd_error("failed to create DMA work queue");
|
|
ret = -ENOMEM;
|
|
goto err_wq;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_wq:
|
|
class_interface_unregister(&rio_mport_interface);
|
|
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);
|
|
destroy_workqueue(dma_wq);
|
|
}
|
|
|
|
module_init(mport_init);
|
|
module_exit(mport_exit);
|