/* -*- c-basic-offset: 8 -*- * * fw-device-cdev.c - Char device for device raw access * * Copyright (C) 2005-2006 Kristian Hoegsberg * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software Foundation, * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include "fw-transaction.h" #include "fw-topology.h" #include "fw-device.h" #include "fw-device-cdev.h" /* * todo * * - bus resets sends a new packet with new generation and node id * */ /* dequeue_event() just kfree()'s the event, so the event has to be * the first field in the struct. */ struct event { struct { void *data; size_t size; } v[2]; struct list_head link; }; struct bus_reset { struct event event; struct fw_cdev_event_bus_reset reset; }; struct response { struct event event; struct fw_transaction transaction; struct client *client; struct list_head link; struct fw_cdev_event_response response; }; struct iso_interrupt { struct event event; struct fw_cdev_event_iso_interrupt interrupt; }; struct client { u32 version; struct fw_device *device; spinlock_t lock; struct list_head handler_list; struct list_head request_list; struct list_head transaction_list; u32 request_serial; struct list_head event_list; wait_queue_head_t wait; struct fw_iso_context *iso_context; struct fw_iso_buffer buffer; unsigned long vm_start; struct list_head link; }; static inline void __user * u64_to_uptr(__u64 value) { return (void __user *)(unsigned long)value; } static inline __u64 uptr_to_u64(void __user *ptr) { return (__u64)(unsigned long)ptr; } static int fw_device_op_open(struct inode *inode, struct file *file) { struct fw_device *device; struct client *client; unsigned long flags; device = fw_device_from_devt(inode->i_rdev); if (device == NULL) return -ENODEV; client = kzalloc(sizeof *client, GFP_KERNEL); if (client == NULL) return -ENOMEM; client->device = fw_device_get(device); INIT_LIST_HEAD(&client->event_list); INIT_LIST_HEAD(&client->handler_list); INIT_LIST_HEAD(&client->request_list); INIT_LIST_HEAD(&client->transaction_list); spin_lock_init(&client->lock); init_waitqueue_head(&client->wait); file->private_data = client; spin_lock_irqsave(&device->card->lock, flags); list_add_tail(&client->link, &device->client_list); spin_unlock_irqrestore(&device->card->lock, flags); return 0; } static void queue_event(struct client *client, struct event *event, void *data0, size_t size0, void *data1, size_t size1) { unsigned long flags; event->v[0].data = data0; event->v[0].size = size0; event->v[1].data = data1; event->v[1].size = size1; spin_lock_irqsave(&client->lock, flags); list_add_tail(&event->link, &client->event_list); wake_up_interruptible(&client->wait); spin_unlock_irqrestore(&client->lock, flags); } static int dequeue_event(struct client *client, char __user *buffer, size_t count) { unsigned long flags; struct event *event; size_t size, total; int i, retval; retval = wait_event_interruptible(client->wait, !list_empty(&client->event_list) || fw_device_is_shutdown(client->device)); if (retval < 0) return retval; if (list_empty(&client->event_list) && fw_device_is_shutdown(client->device)) return -ENODEV; spin_lock_irqsave(&client->lock, flags); event = container_of(client->event_list.next, struct event, link); list_del(&event->link); spin_unlock_irqrestore(&client->lock, flags); total = 0; for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { size = min(event->v[i].size, count - total); if (copy_to_user(buffer + total, event->v[i].data, size)) { retval = -EFAULT; goto out; } total += size; } retval = total; out: kfree(event); return retval; } static ssize_t fw_device_op_read(struct file *file, char __user *buffer, size_t count, loff_t *offset) { struct client *client = file->private_data; return dequeue_event(client, buffer, count); } static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, struct fw_device *device) { struct fw_card *card = device->card; event->type = FW_CDEV_EVENT_BUS_RESET; event->node_id = device->node_id; event->local_node_id = card->local_node->node_id; event->bm_node_id = 0; /* FIXME: We don't track the BM. */ event->irm_node_id = card->irm_node->node_id; event->root_node_id = card->root_node->node_id; event->generation = card->generation; } static void for_each_client(struct fw_device *device, void (*callback)(struct client *client)) { struct fw_card *card = device->card; struct client *c; unsigned long flags; spin_lock_irqsave(&card->lock, flags); list_for_each_entry(c, &device->client_list, link) callback(c); spin_unlock_irqrestore(&card->lock, flags); } static void queue_bus_reset_event(struct client *client) { struct bus_reset *bus_reset; struct fw_device *device = client->device; bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC); if (bus_reset == NULL) { fw_notify("Out of memory when allocating bus reset event\n"); return; } fill_bus_reset_event(&bus_reset->reset, device); queue_event(client, &bus_reset->event, &bus_reset->reset, sizeof bus_reset->reset, NULL, 0); } void fw_device_cdev_update(struct fw_device *device) { for_each_client(device, queue_bus_reset_event); } static void wake_up_client(struct client *client) { wake_up_interruptible(&client->wait); } void fw_device_cdev_remove(struct fw_device *device) { for_each_client(device, wake_up_client); } static int ioctl_get_info(struct client *client, void __user *arg) { struct fw_cdev_get_info get_info; struct fw_cdev_event_bus_reset bus_reset; if (copy_from_user(&get_info, arg, sizeof get_info)) return -EFAULT; client->version = get_info.version; get_info.version = FW_CDEV_VERSION; if (get_info.rom != 0) { void __user *uptr = u64_to_uptr(get_info.rom); size_t want = get_info.rom_length; size_t have = client->device->config_rom_length * 4; if (copy_to_user(uptr, client->device->config_rom, min(want, have))) return -EFAULT; } get_info.rom_length = client->device->config_rom_length * 4; if (get_info.bus_reset != 0) { void __user *uptr = u64_to_uptr(get_info.bus_reset); fill_bus_reset_event(&bus_reset, client->device); if (copy_to_user(uptr, &bus_reset, sizeof bus_reset)) return -EFAULT; } get_info.card = client->device->card->index; if (copy_to_user(arg, &get_info, sizeof get_info)) return -EFAULT; return 0; } static void complete_transaction(struct fw_card *card, int rcode, void *payload, size_t length, void *data) { struct response *response = data; struct client *client = response->client; unsigned long flags; if (length < response->response.length) response->response.length = length; if (rcode == RCODE_COMPLETE) memcpy(response->response.data, payload, response->response.length); spin_lock_irqsave(&client->lock, flags); list_del(&response->link); spin_unlock_irqrestore(&client->lock, flags); response->response.type = FW_CDEV_EVENT_RESPONSE; response->response.rcode = rcode; queue_event(client, &response->event, &response->response, sizeof response->response, response->response.data, response->response.length); } static ssize_t ioctl_send_request(struct client *client, void __user *arg) { struct fw_device *device = client->device; struct fw_cdev_send_request request; struct response *response; unsigned long flags; if (copy_from_user(&request, arg, sizeof request)) return -EFAULT; /* What is the biggest size we'll accept, really? */ if (request.length > 4096) return -EINVAL; response = kmalloc(sizeof *response + request.length, GFP_KERNEL); if (response == NULL) return -ENOMEM; response->client = client; response->response.length = request.length; response->response.closure = request.closure; if (request.data && copy_from_user(response->response.data, u64_to_uptr(request.data), request.length)) { kfree(response); return -EFAULT; } spin_lock_irqsave(&client->lock, flags); list_add_tail(&response->link, &client->transaction_list); spin_unlock_irqrestore(&client->lock, flags); fw_send_request(device->card, &response->transaction, request.tcode & 0x1f, device->node->node_id, request.generation, device->node->max_speed, request.offset, response->response.data, request.length, complete_transaction, response); if (request.data) return sizeof request + request.length; else return sizeof request; } struct address_handler { struct fw_address_handler handler; __u64 closure; struct client *client; struct list_head link; }; struct request { struct fw_request *request; void *data; size_t length; u32 serial; struct list_head link; }; struct request_event { struct event event; struct fw_cdev_event_request request; }; static void handle_request(struct fw_card *card, struct fw_request *r, int tcode, int destination, int source, int generation, int speed, unsigned long long offset, void *payload, size_t length, void *callback_data) { struct address_handler *handler = callback_data; struct request *request; struct request_event *e; unsigned long flags; struct client *client = handler->client; request = kmalloc(sizeof *request, GFP_ATOMIC); e = kmalloc(sizeof *e, GFP_ATOMIC); if (request == NULL || e == NULL) { kfree(request); kfree(e); fw_send_response(card, r, RCODE_CONFLICT_ERROR); return; } request->request = r; request->data = payload; request->length = length; spin_lock_irqsave(&client->lock, flags); request->serial = client->request_serial++; list_add_tail(&request->link, &client->request_list); spin_unlock_irqrestore(&client->lock, flags); e->request.type = FW_CDEV_EVENT_REQUEST; e->request.tcode = tcode; e->request.offset = offset; e->request.length = length; e->request.serial = request->serial; e->request.closure = handler->closure; queue_event(client, &e->event, &e->request, sizeof e->request, payload, length); } static int ioctl_allocate(struct client *client, void __user *arg) { struct fw_cdev_allocate request; struct address_handler *handler; unsigned long flags; struct fw_address_region region; if (copy_from_user(&request, arg, sizeof request)) return -EFAULT; handler = kmalloc(sizeof *handler, GFP_KERNEL); if (handler == NULL) return -ENOMEM; region.start = request.offset; region.end = request.offset + request.length; handler->handler.length = request.length; handler->handler.address_callback = handle_request; handler->handler.callback_data = handler; handler->closure = request.closure; handler->client = client; if (fw_core_add_address_handler(&handler->handler, ®ion) < 0) { kfree(handler); return -EBUSY; } spin_lock_irqsave(&client->lock, flags); list_add_tail(&handler->link, &client->handler_list); spin_unlock_irqrestore(&client->lock, flags); return 0; } static int ioctl_deallocate(struct client *client, void __user *arg) { struct fw_cdev_deallocate request; struct address_handler *handler; unsigned long flags; if (copy_from_user(&request, arg, sizeof request)) return -EFAULT; spin_lock_irqsave(&client->lock, flags); list_for_each_entry(handler, &client->handler_list, link) { if (handler->handler.offset == request.offset) { list_del(&handler->link); break; } } spin_unlock_irqrestore(&client->lock, flags); if (&handler->link == &client->handler_list) return -EINVAL; fw_core_remove_address_handler(&handler->handler); return 0; } static int ioctl_send_response(struct client *client, void __user *arg) { struct fw_cdev_send_response request; struct request *r; unsigned long flags; if (copy_from_user(&request, arg, sizeof request)) return -EFAULT; spin_lock_irqsave(&client->lock, flags); list_for_each_entry(r, &client->request_list, link) { if (r->serial == request.serial) { list_del(&r->link); break; } } spin_unlock_irqrestore(&client->lock, flags); if (&r->link == &client->request_list) return -EINVAL; if (request.length < r->length) r->length = request.length; if (copy_from_user(r->data, u64_to_uptr(request.data), r->length)) return -EFAULT; fw_send_response(client->device->card, r->request, request.rcode); kfree(r); return 0; } static int ioctl_initiate_bus_reset(struct client *client, void __user *arg) { struct fw_cdev_initiate_bus_reset request; int short_reset; if (copy_from_user(&request, arg, sizeof request)) return -EFAULT; short_reset = (request.type == FW_CDEV_SHORT_RESET); return fw_core_initiate_bus_reset(client->device->card, short_reset); } static void iso_callback(struct fw_iso_context *context, u32 cycle, size_t header_length, void *header, void *data) { struct client *client = data; struct iso_interrupt *interrupt; interrupt = kzalloc(sizeof *interrupt + header_length, GFP_ATOMIC); if (interrupt == NULL) return; interrupt->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; interrupt->interrupt.closure = 0; interrupt->interrupt.cycle = cycle; interrupt->interrupt.header_length = header_length; memcpy(interrupt->interrupt.header, header, header_length); queue_event(client, &interrupt->event, &interrupt->interrupt, sizeof interrupt->interrupt + header_length, 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; if (request.channel > 63) return -EINVAL; switch (request.type) { case FW_ISO_CONTEXT_RECEIVE: if (request.header_size < 4 || (request.header_size & 3)) return -EINVAL; break; case FW_ISO_CONTEXT_TRANSMIT: if (request.speed > SCODE_3200) return -EINVAL; break; default: return -EINVAL; } client->iso_context = fw_iso_context_create(client->device->card, request.type, request.channel, request.speed, request.header_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; struct fw_iso_context *ctx = client->iso_context; unsigned long payload, payload_end, header_length; int count; struct { struct fw_iso_packet packet; u8 header[256]; } u; if (ctx == 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 0, 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.*/ payload = (unsigned long)request.data - client->vm_start; payload_end = payload + (client->buffer.page_count << PAGE_SHIFT); if (request.data == 0 || client->buffer.pages == NULL || payload >= payload_end) { payload = 0; payload_end = 0; } 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; if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) { header_length = u.packet.header_length; } else { /* We require that header_length is a multiple of * the fixed header size, ctx->header_size */ if (ctx->header_size == 0) { if (u.packet.header_length > 0) return -EINVAL; } else if (u.packet.header_length % ctx->header_size != 0) { return -EINVAL; } header_length = 0; } next = (struct fw_cdev_iso_packet __user *) &p->header[header_length / 4]; if (next > end) return -EINVAL; if (__copy_from_user (u.packet.header, p->header, header_length)) return -EFAULT; if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT && 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(ctx, &u.packet, &client->buffer, 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; if (copy_to_user(arg, &request, sizeof request)) return -EFAULT; return count; } static int ioctl_start_iso(struct client *client, void __user *arg) { struct fw_cdev_start_iso request; if (copy_from_user(&request, arg, sizeof request)) return -EFAULT; if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) { if (request.tags == 0 || request.tags > 15) return -EINVAL; if (request.sync > 15) return -EINVAL; } return fw_iso_context_start(client->iso_context, request.cycle, request.sync, request.tags); } static int ioctl_stop_iso(struct client *client, void __user *arg) { return fw_iso_context_stop(client->iso_context); } static int dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg) { switch (cmd) { case FW_CDEV_IOC_GET_INFO: return ioctl_get_info(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_DEALLOCATE: return ioctl_deallocate(client, arg); case FW_CDEV_IOC_SEND_RESPONSE: return ioctl_send_response(client, arg); case FW_CDEV_IOC_INITIATE_BUS_RESET: return ioctl_initiate_bus_reset(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_START_ISO: return ioctl_start_iso(client, arg); case FW_CDEV_IOC_STOP_ISO: return ioctl_stop_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; enum dma_data_direction direction; unsigned long size; int page_count, retval; /* FIXME: We could support multiple buffers, but we don't. */ if (client->buffer.pages != NULL) return -EBUSY; if (!(vma->vm_flags & VM_SHARED)) return -EINVAL; if (vma->vm_start & ~PAGE_MASK) return -EINVAL; client->vm_start = vma->vm_start; size = vma->vm_end - vma->vm_start; page_count = size >> PAGE_SHIFT; if (size & ~PAGE_MASK) return -EINVAL; if (vma->vm_flags & VM_WRITE) direction = DMA_TO_DEVICE; else direction = DMA_FROM_DEVICE; retval = fw_iso_buffer_init(&client->buffer, client->device->card, page_count, direction); if (retval < 0) return retval; retval = fw_iso_buffer_map(&client->buffer, vma); if (retval < 0) fw_iso_buffer_destroy(&client->buffer, client->device->card); return retval; } static int fw_device_op_release(struct inode *inode, struct file *file) { struct client *client = file->private_data; struct address_handler *h, *next_h; struct request *r, *next_r; struct event *e, *next_e; struct response *t, *next_t; unsigned long flags; if (client->buffer.pages) fw_iso_buffer_destroy(&client->buffer, client->device->card); if (client->iso_context) fw_iso_context_destroy(client->iso_context); list_for_each_entry_safe(h, next_h, &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); } list_for_each_entry_safe(t, next_t, &client->transaction_list, link) { fw_cancel_transaction(client->device->card, &t->transaction); kfree(t); } /* FIXME: We should wait for the async tasklets to stop * running before freeing the memory. */ list_for_each_entry_safe(e, next_e, &client->event_list, link) kfree(e); spin_lock_irqsave(&client->device->card->lock, flags); list_del(&client->link); spin_unlock_irqrestore(&client->device->card->lock, flags); 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; unsigned int mask = 0; poll_wait(file, &client->wait, pt); if (fw_device_is_shutdown(client->device)) mask |= POLLHUP | POLLERR; if (!list_empty(&client->event_list)) mask |= POLLIN | POLLRDNORM; return mask; } const struct file_operations fw_device_ops = { .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 .compat_ioctl = fw_device_op_compat_ioctl, #endif };