2006-12-20 01:58:31 +01:00
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/* -*- c-basic-offset: 8 -*-
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*
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* fw-device-cdev.c - Char device for device raw access
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*
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* Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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/wait.h>
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#include <linux/errno.h>
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#include <linux/device.h>
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#include <linux/vmalloc.h>
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#include <linux/poll.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/compat.h>
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#include <asm/uaccess.h>
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#include "fw-transaction.h"
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#include "fw-topology.h"
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#include "fw-device.h"
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#include "fw-device-cdev.h"
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/*
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* todo
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*
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* - bus resets sends a new packet with new generation and node id
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*
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*/
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/* dequeue_event() just kfree()'s the event, so the event has to be
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* the first field in the struct. */
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struct event {
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struct { void *data; size_t size; } v[2];
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struct list_head link;
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};
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struct response {
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struct event event;
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struct fw_transaction transaction;
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struct client *client;
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struct fw_cdev_event_response response;
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};
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struct iso_interrupt {
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struct event event;
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struct fw_cdev_event_iso_interrupt interrupt;
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};
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struct client {
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struct fw_device *device;
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spinlock_t lock;
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struct list_head handler_list;
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struct list_head request_list;
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u32 request_serial;
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struct list_head event_list;
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struct semaphore event_list_sem;
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wait_queue_head_t wait;
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unsigned long vm_start;
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struct fw_iso_context *iso_context;
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};
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static inline void __user *
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u64_to_uptr(__u64 value)
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{
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return (void __user *)(unsigned long)value;
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}
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static inline __u64
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uptr_to_u64(void __user *ptr)
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{
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return (__u64)(unsigned long)ptr;
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}
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static int fw_device_op_open(struct inode *inode, struct file *file)
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{
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struct fw_device *device;
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struct client *client;
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device = container_of(inode->i_cdev, struct fw_device, cdev);
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client = kzalloc(sizeof *client, GFP_KERNEL);
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if (client == NULL)
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return -ENOMEM;
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client->device = fw_device_get(device);
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INIT_LIST_HEAD(&client->event_list);
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sema_init(&client->event_list_sem, 0);
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INIT_LIST_HEAD(&client->handler_list);
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INIT_LIST_HEAD(&client->request_list);
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spin_lock_init(&client->lock);
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init_waitqueue_head(&client->wait);
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file->private_data = client;
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return 0;
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}
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static void queue_event(struct client *client, struct event *event,
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void *data0, size_t size0, void *data1, size_t size1)
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{
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unsigned long flags;
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event->v[0].data = data0;
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event->v[0].size = size0;
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event->v[1].data = data1;
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event->v[1].size = size1;
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spin_lock_irqsave(&client->lock, flags);
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list_add_tail(&event->link, &client->event_list);
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up(&client->event_list_sem);
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wake_up_interruptible(&client->wait);
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spin_unlock_irqrestore(&client->lock, flags);
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}
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static int dequeue_event(struct client *client, char __user *buffer, size_t count)
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{
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unsigned long flags;
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struct event *event;
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size_t size, total;
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int i, retval = -EFAULT;
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if (down_interruptible(&client->event_list_sem) < 0)
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return -EINTR;
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spin_lock_irqsave(&client->lock, flags);
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event = container_of(client->event_list.next, struct event, link);
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list_del(&event->link);
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spin_unlock_irqrestore(&client->lock, flags);
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if (buffer == NULL)
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goto out;
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total = 0;
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for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
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size = min(event->v[i].size, count - total);
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if (copy_to_user(buffer + total, event->v[i].data, size))
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goto out;
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total += size;
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}
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retval = total;
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out:
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kfree(event);
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return retval;
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}
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static ssize_t
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fw_device_op_read(struct file *file,
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char __user *buffer, size_t count, loff_t *offset)
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{
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struct client *client = file->private_data;
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return dequeue_event(client, buffer, count);
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}
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static int ioctl_config_rom(struct client *client, void __user *arg)
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{
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struct fw_cdev_get_config_rom rom;
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rom.length = client->device->config_rom_length;
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memcpy(rom.data, client->device->config_rom, rom.length * 4);
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if (copy_to_user(arg, &rom,
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(char *)&rom.data[rom.length] - (char *)&rom))
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return -EFAULT;
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return 0;
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}
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static void
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complete_transaction(struct fw_card *card, int rcode,
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void *payload, size_t length, void *data)
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{
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struct response *response = data;
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struct client *client = response->client;
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if (length < response->response.length)
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response->response.length = length;
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if (rcode == RCODE_COMPLETE)
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memcpy(response->response.data, payload,
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response->response.length);
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response->response.type = FW_CDEV_EVENT_RESPONSE;
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response->response.rcode = rcode;
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queue_event(client, &response->event,
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&response->response, sizeof response->response,
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response->response.data, response->response.length);
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}
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static ssize_t ioctl_send_request(struct client *client, void __user *arg)
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{
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struct fw_device *device = client->device;
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struct fw_cdev_send_request request;
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struct response *response;
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if (copy_from_user(&request, arg, sizeof request))
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return -EFAULT;
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/* What is the biggest size we'll accept, really? */
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if (request.length > 4096)
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return -EINVAL;
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response = kmalloc(sizeof *response + request.length, GFP_KERNEL);
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if (response == NULL)
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return -ENOMEM;
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response->client = client;
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response->response.length = request.length;
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response->response.closure = request.closure;
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if (request.data &&
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copy_from_user(response->response.data,
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u64_to_uptr(request.data), request.length)) {
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kfree(response);
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return -EFAULT;
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}
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fw_send_request(device->card, &response->transaction,
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request.tcode,
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device->node->node_id | LOCAL_BUS,
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device->card->generation,
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device->node->max_speed,
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request.offset,
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response->response.data, request.length,
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complete_transaction, response);
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if (request.data)
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return sizeof request + request.length;
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else
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return sizeof request;
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}
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struct address_handler {
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struct fw_address_handler handler;
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__u64 closure;
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struct client *client;
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struct list_head link;
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};
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struct request {
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struct fw_request *request;
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void *data;
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size_t length;
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u32 serial;
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struct list_head link;
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};
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struct request_event {
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struct event event;
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struct fw_cdev_event_request request;
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};
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static void
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handle_request(struct fw_card *card, struct fw_request *r,
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int tcode, int destination, int source,
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int generation, int speed,
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unsigned long long offset,
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void *payload, size_t length, void *callback_data)
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{
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struct address_handler *handler = callback_data;
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struct request *request;
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struct request_event *e;
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unsigned long flags;
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struct client *client = handler->client;
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request = kmalloc(sizeof *request, GFP_ATOMIC);
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e = kmalloc(sizeof *e, GFP_ATOMIC);
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if (request == NULL || e == NULL) {
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kfree(request);
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kfree(e);
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fw_send_response(card, r, RCODE_CONFLICT_ERROR);
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return;
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}
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request->request = r;
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request->data = payload;
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request->length = length;
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spin_lock_irqsave(&client->lock, flags);
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request->serial = client->request_serial++;
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list_add_tail(&request->link, &client->request_list);
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spin_unlock_irqrestore(&client->lock, flags);
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e->request.type = FW_CDEV_EVENT_REQUEST;
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e->request.tcode = tcode;
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e->request.offset = offset;
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e->request.length = length;
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e->request.serial = request->serial;
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e->request.closure = handler->closure;
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queue_event(client, &e->event,
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&e->request, sizeof e->request, payload, length);
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}
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static int ioctl_allocate(struct client *client, void __user *arg)
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{
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struct fw_cdev_allocate request;
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struct address_handler *handler;
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unsigned long flags;
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struct fw_address_region region;
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if (copy_from_user(&request, arg, sizeof request))
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return -EFAULT;
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handler = kmalloc(sizeof *handler, GFP_KERNEL);
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if (handler == NULL)
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return -ENOMEM;
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region.start = request.offset;
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region.end = request.offset + request.length;
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handler->handler.length = request.length;
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handler->handler.address_callback = handle_request;
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handler->handler.callback_data = handler;
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handler->closure = request.closure;
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handler->client = client;
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if (fw_core_add_address_handler(&handler->handler, ®ion) < 0) {
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kfree(handler);
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return -EBUSY;
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}
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spin_lock_irqsave(&client->lock, flags);
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list_add_tail(&handler->link, &client->handler_list);
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spin_unlock_irqrestore(&client->lock, flags);
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return 0;
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}
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static int ioctl_send_response(struct client *client, void __user *arg)
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{
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struct fw_cdev_send_response request;
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struct request *r;
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unsigned long flags;
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if (copy_from_user(&request, arg, sizeof request))
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return -EFAULT;
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spin_lock_irqsave(&client->lock, flags);
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list_for_each_entry(r, &client->request_list, link) {
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if (r->serial == request.serial) {
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list_del(&r->link);
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break;
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}
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}
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spin_unlock_irqrestore(&client->lock, flags);
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if (&r->link == &client->request_list)
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return -EINVAL;
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if (request.length < r->length)
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r->length = request.length;
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if (copy_from_user(r->data, u64_to_uptr(request.data), r->length))
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return -EFAULT;
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fw_send_response(client->device->card, r->request, request.rcode);
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kfree(r);
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return 0;
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}
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static void
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iso_callback(struct fw_iso_context *context, int status, u32 cycle, void *data)
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{
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struct client *client = data;
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struct iso_interrupt *interrupt;
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interrupt = kzalloc(sizeof *interrupt, GFP_ATOMIC);
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if (interrupt == NULL)
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return;
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interrupt->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
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interrupt->interrupt.closure = 0;
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interrupt->interrupt.cycle = cycle;
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|
|
queue_event(client, &interrupt->event,
|
|
|
|
&interrupt->interrupt, sizeof interrupt->interrupt, NULL, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ioctl_create_iso_context(struct client *client, void __user *arg)
|
|
|
|
{
|
|
|
|
struct fw_cdev_create_iso_context request;
|
|
|
|
|
|
|
|
if (copy_from_user(&request, arg, sizeof request))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
client->iso_context = fw_iso_context_create(client->device->card,
|
|
|
|
FW_ISO_CONTEXT_TRANSMIT,
|
|
|
|
request.buffer_size,
|
|
|
|
iso_callback, client);
|
|
|
|
if (IS_ERR(client->iso_context))
|
|
|
|
return PTR_ERR(client->iso_context);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ioctl_queue_iso(struct client *client, void __user *arg)
|
|
|
|
{
|
|
|
|
struct fw_cdev_queue_iso request;
|
|
|
|
struct fw_cdev_iso_packet __user *p, *end, *next;
|
|
|
|
void *payload, *payload_end;
|
|
|
|
unsigned long index;
|
|
|
|
int count;
|
|
|
|
struct {
|
|
|
|
struct fw_iso_packet packet;
|
|
|
|
u8 header[256];
|
|
|
|
} u;
|
|
|
|
|
|
|
|
if (client->iso_context == NULL)
|
|
|
|
return -EINVAL;
|
|
|
|
if (copy_from_user(&request, arg, sizeof request))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
/* If the user passes a non-NULL data pointer, has mmap()'ed
|
|
|
|
* the iso buffer, and the pointer points inside the buffer,
|
|
|
|
* we setup the payload pointers accordingly. Otherwise we
|
|
|
|
* set them both to NULL, which will still let packets with
|
|
|
|
* payload_length == 0 through. In other words, if no packets
|
|
|
|
* use the indirect payload, the iso buffer need not be mapped
|
|
|
|
* and the request.data pointer is ignored.*/
|
|
|
|
|
|
|
|
index = (unsigned long)request.data - client->vm_start;
|
|
|
|
if (request.data != 0 && client->vm_start != 0 &&
|
|
|
|
index <= client->iso_context->buffer_size) {
|
|
|
|
payload = client->iso_context->buffer + index;
|
|
|
|
payload_end = client->iso_context->buffer +
|
|
|
|
client->iso_context->buffer_size;
|
|
|
|
} else {
|
|
|
|
payload = NULL;
|
|
|
|
payload_end = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!access_ok(VERIFY_READ, request.packets, request.size))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request.packets);
|
|
|
|
end = (void __user *)p + request.size;
|
|
|
|
count = 0;
|
|
|
|
while (p < end) {
|
|
|
|
if (__copy_from_user(&u.packet, p, sizeof *p))
|
|
|
|
return -EFAULT;
|
|
|
|
next = (struct fw_cdev_iso_packet __user *)
|
|
|
|
&p->header[u.packet.header_length / 4];
|
|
|
|
if (next > end)
|
|
|
|
return -EINVAL;
|
|
|
|
if (__copy_from_user
|
|
|
|
(u.packet.header, p->header, u.packet.header_length))
|
|
|
|
return -EFAULT;
|
|
|
|
if (u.packet.skip &&
|
|
|
|
u.packet.header_length + u.packet.payload_length > 0)
|
|
|
|
return -EINVAL;
|
|
|
|
if (payload + u.packet.payload_length > payload_end)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
if (fw_iso_context_queue(client->iso_context,
|
|
|
|
&u.packet, payload))
|
|
|
|
break;
|
|
|
|
|
|
|
|
p = next;
|
|
|
|
payload += u.packet.payload_length;
|
|
|
|
count++;
|
|
|
|
}
|
|
|
|
|
|
|
|
request.size -= uptr_to_u64(p) - request.packets;
|
|
|
|
request.packets = uptr_to_u64(p);
|
|
|
|
request.data =
|
|
|
|
client->vm_start + (payload - client->iso_context->buffer);
|
|
|
|
|
|
|
|
if (copy_to_user(arg, &request, sizeof request))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ioctl_send_iso(struct client *client, void __user *arg)
|
|
|
|
{
|
|
|
|
struct fw_cdev_send_iso request;
|
|
|
|
|
|
|
|
if (copy_from_user(&request, arg, sizeof request))
|
|
|
|
return -EFAULT;
|
|
|
|
|
|
|
|
return fw_iso_context_send(client->iso_context, request.channel,
|
|
|
|
request.speed, request.cycle);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
|
|
|
|
{
|
|
|
|
switch (cmd) {
|
|
|
|
case FW_CDEV_IOC_GET_CONFIG_ROM:
|
|
|
|
return ioctl_config_rom(client, arg);
|
|
|
|
case FW_CDEV_IOC_SEND_REQUEST:
|
|
|
|
return ioctl_send_request(client, arg);
|
|
|
|
case FW_CDEV_IOC_ALLOCATE:
|
|
|
|
return ioctl_allocate(client, arg);
|
|
|
|
case FW_CDEV_IOC_SEND_RESPONSE:
|
|
|
|
return ioctl_send_response(client, arg);
|
|
|
|
case FW_CDEV_IOC_CREATE_ISO_CONTEXT:
|
|
|
|
return ioctl_create_iso_context(client, arg);
|
|
|
|
case FW_CDEV_IOC_QUEUE_ISO:
|
|
|
|
return ioctl_queue_iso(client, arg);
|
|
|
|
case FW_CDEV_IOC_SEND_ISO:
|
|
|
|
return ioctl_send_iso(client, arg);
|
|
|
|
default:
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static long
|
|
|
|
fw_device_op_ioctl(struct file *file,
|
|
|
|
unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct client *client = file->private_data;
|
|
|
|
|
|
|
|
return dispatch_ioctl(client, cmd, (void __user *) arg);
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
static long
|
|
|
|
fw_device_op_compat_ioctl(struct file *file,
|
|
|
|
unsigned int cmd, unsigned long arg)
|
|
|
|
{
|
|
|
|
struct client *client = file->private_data;
|
|
|
|
|
|
|
|
return dispatch_ioctl(client, cmd, compat_ptr(arg));
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
|
|
|
|
{
|
|
|
|
struct client *client = file->private_data;
|
|
|
|
|
|
|
|
if (client->iso_context->buffer == NULL)
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
client->vm_start = vma->vm_start;
|
|
|
|
|
|
|
|
return remap_vmalloc_range(vma, client->iso_context->buffer, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int fw_device_op_release(struct inode *inode, struct file *file)
|
|
|
|
{
|
|
|
|
struct client *client = file->private_data;
|
|
|
|
struct address_handler *h, *next;
|
|
|
|
struct request *r, *next_r;
|
|
|
|
|
|
|
|
if (client->iso_context)
|
|
|
|
fw_iso_context_destroy(client->iso_context);
|
|
|
|
|
|
|
|
list_for_each_entry_safe(h, next, &client->handler_list, link) {
|
|
|
|
fw_core_remove_address_handler(&h->handler);
|
|
|
|
kfree(h);
|
|
|
|
}
|
|
|
|
|
|
|
|
list_for_each_entry_safe(r, next_r, &client->request_list, link) {
|
|
|
|
fw_send_response(client->device->card, r->request,
|
|
|
|
RCODE_CONFLICT_ERROR);
|
|
|
|
kfree(r);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* TODO: wait for all transactions to finish so
|
|
|
|
* complete_transaction doesn't try to queue up responses
|
|
|
|
* after we free client. */
|
|
|
|
while (!list_empty(&client->event_list))
|
|
|
|
dequeue_event(client, NULL, 0);
|
|
|
|
|
|
|
|
fw_device_put(client->device);
|
|
|
|
kfree(client);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
|
|
|
|
{
|
|
|
|
struct client *client = file->private_data;
|
|
|
|
|
|
|
|
poll_wait(file, &client->wait, pt);
|
|
|
|
|
|
|
|
if (!list_empty(&client->event_list))
|
|
|
|
return POLLIN | POLLRDNORM;
|
|
|
|
else
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2007-01-14 15:29:07 +01:00
|
|
|
const struct file_operations fw_device_ops = {
|
2006-12-20 01:58:31 +01:00
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.open = fw_device_op_open,
|
|
|
|
.read = fw_device_op_read,
|
|
|
|
.unlocked_ioctl = fw_device_op_ioctl,
|
|
|
|
.poll = fw_device_op_poll,
|
|
|
|
.release = fw_device_op_release,
|
|
|
|
.mmap = fw_device_op_mmap,
|
|
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
2007-01-21 20:45:32 +01:00
|
|
|
.compat_ioctl = fw_device_op_compat_ioctl,
|
2006-12-20 01:58:31 +01:00
|
|
|
#endif
|
|
|
|
};
|