/* * Char device for device raw access * * Copyright (C) 2005-2007 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 #include #include #include #include #include #include #include #include #include "fw-device.h" #include "fw-topology.h" #include "fw-transaction.h" struct client { u32 version; struct fw_device *device; spinlock_t lock; bool in_shutdown; struct idr resource_idr; struct list_head event_list; wait_queue_head_t wait; u64 bus_reset_closure; struct fw_iso_context *iso_context; u64 iso_closure; struct fw_iso_buffer buffer; unsigned long vm_start; struct list_head link; struct kref kref; }; static inline void client_get(struct client *client) { kref_get(&client->kref); } static void client_release(struct kref *kref) { struct client *client = container_of(kref, struct client, kref); fw_device_put(client->device); kfree(client); } static void client_put(struct client *client) { kref_put(&client->kref, client_release); } struct client_resource; typedef void (*client_resource_release_fn_t)(struct client *, struct client_resource *); struct client_resource { client_resource_release_fn_t release; int handle; }; struct address_handler_resource { struct client_resource resource; struct fw_address_handler handler; __u64 closure; struct client *client; }; struct outbound_transaction_resource { struct client_resource resource; struct fw_transaction transaction; }; struct inbound_transaction_resource { struct client_resource resource; struct fw_request *request; void *data; size_t length; }; struct descriptor_resource { struct client_resource resource; struct fw_descriptor descriptor; u32 data[0]; }; struct iso_resource { struct client_resource resource; struct client *client; /* Schedule work and access todo only with client->lock held. */ struct delayed_work work; enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC, ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo; int generation; u64 channels; s32 bandwidth; struct iso_resource_event *e_alloc, *e_dealloc; }; static int schedule_iso_resource(struct iso_resource *); static void release_iso_resource(struct client *, struct client_resource *); /* * dequeue_event() just kfree()'s the event, so the event has to be * the first field in a struct XYZ_event. */ struct event { struct { void *data; size_t size; } v[2]; struct list_head link; }; struct bus_reset_event { struct event event; struct fw_cdev_event_bus_reset reset; }; struct outbound_transaction_event { struct event event; struct client *client; struct outbound_transaction_resource r; struct fw_cdev_event_response response; }; struct inbound_transaction_event { struct event event; struct fw_cdev_event_request request; }; struct iso_interrupt_event { struct event event; struct fw_cdev_event_iso_interrupt interrupt; }; struct iso_resource_event { struct event event; struct fw_cdev_event_iso_resource resource; }; 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; device = fw_device_get_by_devt(inode->i_rdev); if (device == NULL) return -ENODEV; if (fw_device_is_shutdown(device)) { fw_device_put(device); return -ENODEV; } client = kzalloc(sizeof(*client), GFP_KERNEL); if (client == NULL) { fw_device_put(device); return -ENOMEM; } client->device = device; spin_lock_init(&client->lock); idr_init(&client->resource_idr); INIT_LIST_HEAD(&client->event_list); init_waitqueue_head(&client->wait); kref_init(&client->kref); file->private_data = client; mutex_lock(&device->client_list_mutex); list_add_tail(&client->link, &device->client_list); mutex_unlock(&device->client_list_mutex); 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); if (client->in_shutdown) kfree(event); else list_add_tail(&event->link, &client->event_list); spin_unlock_irqrestore(&client->lock, flags); wake_up_interruptible(&client->wait); } 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, ret; ret = wait_event_interruptible(client->wait, !list_empty(&client->event_list) || fw_device_is_shutdown(client->device)); if (ret < 0) return ret; if (list_empty(&client->event_list) && fw_device_is_shutdown(client->device)) return -ENODEV; spin_lock_irqsave(&client->lock, flags); event = list_first_entry(&client->event_list, 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)) { ret = -EFAULT; goto out; } total += size; } ret = total; out: kfree(event); return ret; } 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 client *client) { struct fw_card *card = client->device->card; unsigned long flags; spin_lock_irqsave(&card->lock, flags); event->closure = client->bus_reset_closure; event->type = FW_CDEV_EVENT_BUS_RESET; event->generation = client->device->generation; event->node_id = client->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; spin_unlock_irqrestore(&card->lock, flags); } static void for_each_client(struct fw_device *device, void (*callback)(struct client *client)) { struct client *c; mutex_lock(&device->client_list_mutex); list_for_each_entry(c, &device->client_list, link) callback(c); mutex_unlock(&device->client_list_mutex); } static int schedule_reallocations(int id, void *p, void *data) { struct client_resource *r = p; if (r->release == release_iso_resource) schedule_iso_resource(container_of(r, struct iso_resource, resource)); return 0; } static void queue_bus_reset_event(struct client *client) { struct bus_reset_event *e; e = kzalloc(sizeof(*e), GFP_KERNEL); if (e == NULL) { fw_notify("Out of memory when allocating bus reset event\n"); return; } fill_bus_reset_event(&e->reset, client); queue_event(client, &e->event, &e->reset, sizeof(e->reset), NULL, 0); spin_lock_irq(&client->lock); idr_for_each(&client->resource_idr, schedule_reallocations, client); spin_unlock_irq(&client->lock); } 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 *buffer) { struct fw_cdev_get_info *get_info = buffer; struct fw_cdev_event_bus_reset bus_reset; unsigned long ret = 0; client->version = get_info->version; get_info->version = FW_CDEV_VERSION; get_info->card = client->device->card->index; down_read(&fw_device_rwsem); 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; ret = copy_to_user(uptr, client->device->config_rom, min(want, have)); } get_info->rom_length = client->device->config_rom_length * 4; up_read(&fw_device_rwsem); if (ret != 0) return -EFAULT; client->bus_reset_closure = get_info->bus_reset_closure; if (get_info->bus_reset != 0) { void __user *uptr = u64_to_uptr(get_info->bus_reset); fill_bus_reset_event(&bus_reset, client); if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset))) return -EFAULT; } return 0; } static int add_client_resource(struct client *client, struct client_resource *resource, gfp_t gfp_mask) { unsigned long flags; int ret; retry: if (idr_pre_get(&client->resource_idr, gfp_mask) == 0) return -ENOMEM; spin_lock_irqsave(&client->lock, flags); if (client->in_shutdown) ret = -ECANCELED; else ret = idr_get_new(&client->resource_idr, resource, &resource->handle); if (ret >= 0) { client_get(client); if (resource->release == release_iso_resource) schedule_iso_resource(container_of(resource, struct iso_resource, resource)); } spin_unlock_irqrestore(&client->lock, flags); if (ret == -EAGAIN) goto retry; return ret < 0 ? ret : 0; } static int release_client_resource(struct client *client, u32 handle, client_resource_release_fn_t release, struct client_resource **resource) { struct client_resource *r; unsigned long flags; spin_lock_irqsave(&client->lock, flags); if (client->in_shutdown) r = NULL; else r = idr_find(&client->resource_idr, handle); if (r && r->release == release) idr_remove(&client->resource_idr, handle); spin_unlock_irqrestore(&client->lock, flags); if (!(r && r->release == release)) return -EINVAL; if (resource) *resource = r; else r->release(client, r); client_put(client); return 0; } static void release_transaction(struct client *client, struct client_resource *resource) { struct outbound_transaction_resource *r = container_of(resource, struct outbound_transaction_resource, resource); fw_cancel_transaction(client->device->card, &r->transaction); } static void complete_transaction(struct fw_card *card, int rcode, void *payload, size_t length, void *data) { struct outbound_transaction_event *e = data; struct fw_cdev_event_response *rsp = &e->response; struct client *client = e->client; unsigned long flags; if (length < rsp->length) rsp->length = length; if (rcode == RCODE_COMPLETE) memcpy(rsp->data, payload, rsp->length); spin_lock_irqsave(&client->lock, flags); /* * 1. If called while in shutdown, the idr tree must be left untouched. * The idr handle will be removed and the client reference will be * dropped later. * 2. If the call chain was release_client_resource -> * release_transaction -> complete_transaction (instead of a normal * conclusion of the transaction), i.e. if this resource was already * unregistered from the idr, the client reference will be dropped * by release_client_resource and we must not drop it here. */ if (!client->in_shutdown && idr_find(&client->resource_idr, e->r.resource.handle)) { idr_remove(&client->resource_idr, e->r.resource.handle); /* Drop the idr's reference */ client_put(client); } spin_unlock_irqrestore(&client->lock, flags); rsp->type = FW_CDEV_EVENT_RESPONSE; rsp->rcode = rcode; /* * In the case that sizeof(*rsp) doesn't align with the position of the * data, and the read is short, preserve an extra copy of the data * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless * for short reads and some apps depended on it, this is both safe * and prudent for compatibility. */ if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data)) queue_event(client, &e->event, rsp, sizeof(*rsp), rsp->data, rsp->length); else queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, NULL, 0); /* Drop the transaction callback's reference */ client_put(client); } static int init_request(struct client *client, struct fw_cdev_send_request *request, int destination_id, int speed) { struct outbound_transaction_event *e; int ret; /* What is the biggest size we'll accept, really? */ if (request->length > 4096) return -EINVAL; e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL); if (e == NULL) return -ENOMEM; e->client = client; e->response.length = request->length; e->response.closure = request->closure; if (request->data && copy_from_user(e->response.data, u64_to_uptr(request->data), request->length)) { ret = -EFAULT; goto failed; } e->r.resource.release = release_transaction; ret = add_client_resource(client, &e->r.resource, GFP_KERNEL); if (ret < 0) goto failed; /* Get a reference for the transaction callback */ client_get(client); fw_send_request(client->device->card, &e->r.transaction, request->tcode & 0x1f, destination_id, request->generation, speed, request->offset, e->response.data, request->length, complete_transaction, e); if (request->data) return sizeof(request) + request->length; else return sizeof(request); failed: kfree(e); return ret; } static int ioctl_send_request(struct client *client, void *buffer) { struct fw_cdev_send_request *request = buffer; switch (request->tcode) { case TCODE_WRITE_QUADLET_REQUEST: case TCODE_WRITE_BLOCK_REQUEST: case TCODE_READ_QUADLET_REQUEST: case TCODE_READ_BLOCK_REQUEST: case TCODE_LOCK_MASK_SWAP: case TCODE_LOCK_COMPARE_SWAP: case TCODE_LOCK_FETCH_ADD: case TCODE_LOCK_LITTLE_ADD: case TCODE_LOCK_BOUNDED_ADD: case TCODE_LOCK_WRAP_ADD: case TCODE_LOCK_VENDOR_DEPENDENT: break; default: return -EINVAL; } return init_request(client, request, client->device->node->node_id, client->device->max_speed); } static void release_request(struct client *client, struct client_resource *resource) { struct inbound_transaction_resource *r = container_of(resource, struct inbound_transaction_resource, resource); fw_send_response(client->device->card, r->request, RCODE_CONFLICT_ERROR); kfree(r); } static void handle_request(struct fw_card *card, struct fw_request *request, 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_resource *handler = callback_data; struct inbound_transaction_resource *r; struct inbound_transaction_event *e; int ret; r = kmalloc(sizeof(*r), GFP_ATOMIC); e = kmalloc(sizeof(*e), GFP_ATOMIC); if (r == NULL || e == NULL) goto failed; r->request = request; r->data = payload; r->length = length; r->resource.release = release_request; ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC); if (ret < 0) goto failed; e->request.type = FW_CDEV_EVENT_REQUEST; e->request.tcode = tcode; e->request.offset = offset; e->request.length = length; e->request.handle = r->resource.handle; e->request.closure = handler->closure; queue_event(handler->client, &e->event, &e->request, sizeof(e->request), payload, length); return; failed: kfree(r); kfree(e); fw_send_response(card, request, RCODE_CONFLICT_ERROR); } static void release_address_handler(struct client *client, struct client_resource *resource) { struct address_handler_resource *r = container_of(resource, struct address_handler_resource, resource); fw_core_remove_address_handler(&r->handler); kfree(r); } static int ioctl_allocate(struct client *client, void *buffer) { struct fw_cdev_allocate *request = buffer; struct address_handler_resource *r; struct fw_address_region region; int ret; r = kmalloc(sizeof(*r), GFP_KERNEL); if (r == NULL) return -ENOMEM; region.start = request->offset; region.end = request->offset + request->length; r->handler.length = request->length; r->handler.address_callback = handle_request; r->handler.callback_data = r; r->closure = request->closure; r->client = client; ret = fw_core_add_address_handler(&r->handler, ®ion); if (ret < 0) { kfree(r); return ret; } r->resource.release = release_address_handler; ret = add_client_resource(client, &r->resource, GFP_KERNEL); if (ret < 0) { release_address_handler(client, &r->resource); return ret; } request->handle = r->resource.handle; return 0; } static int ioctl_deallocate(struct client *client, void *buffer) { struct fw_cdev_deallocate *request = buffer; return release_client_resource(client, request->handle, release_address_handler, NULL); } static int ioctl_send_response(struct client *client, void *buffer) { struct fw_cdev_send_response *request = buffer; struct client_resource *resource; struct inbound_transaction_resource *r; if (release_client_resource(client, request->handle, release_request, &resource) < 0) return -EINVAL; r = container_of(resource, struct inbound_transaction_resource, resource); 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 *buffer) { struct fw_cdev_initiate_bus_reset *request = buffer; int short_reset; short_reset = (request->type == FW_CDEV_SHORT_RESET); return fw_core_initiate_bus_reset(client->device->card, short_reset); } static void release_descriptor(struct client *client, struct client_resource *resource) { struct descriptor_resource *r = container_of(resource, struct descriptor_resource, resource); fw_core_remove_descriptor(&r->descriptor); kfree(r); } static int ioctl_add_descriptor(struct client *client, void *buffer) { struct fw_cdev_add_descriptor *request = buffer; struct descriptor_resource *r; int ret; if (request->length > 256) return -EINVAL; r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL); if (r == NULL) return -ENOMEM; if (copy_from_user(r->data, u64_to_uptr(request->data), request->length * 4)) { ret = -EFAULT; goto failed; } r->descriptor.length = request->length; r->descriptor.immediate = request->immediate; r->descriptor.key = request->key; r->descriptor.data = r->data; ret = fw_core_add_descriptor(&r->descriptor); if (ret < 0) goto failed; r->resource.release = release_descriptor; ret = add_client_resource(client, &r->resource, GFP_KERNEL); if (ret < 0) { fw_core_remove_descriptor(&r->descriptor); goto failed; } request->handle = r->resource.handle; return 0; failed: kfree(r); return ret; } static int ioctl_remove_descriptor(struct client *client, void *buffer) { struct fw_cdev_remove_descriptor *request = buffer; return release_client_resource(client, request->handle, release_descriptor, NULL); } 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_event *e; e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC); if (e == NULL) return; e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; e->interrupt.closure = client->iso_closure; e->interrupt.cycle = cycle; e->interrupt.header_length = header_length; memcpy(e->interrupt.header, header, header_length); queue_event(client, &e->event, &e->interrupt, sizeof(e->interrupt) + header_length, NULL, 0); } static int ioctl_create_iso_context(struct client *client, void *buffer) { struct fw_cdev_create_iso_context *request = buffer; struct fw_iso_context *context; /* We only support one context at this time. */ if (client->iso_context != NULL) return -EBUSY; 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; } context = fw_iso_context_create(client->device->card, request->type, request->channel, request->speed, request->header_size, iso_callback, client); if (IS_ERR(context)) return PTR_ERR(context); client->iso_closure = request->closure; client->iso_context = context; /* We only support one context at this time. */ request->handle = 0; return 0; } /* Macros for decoding the iso packet control header. */ #define GET_PAYLOAD_LENGTH(v) ((v) & 0xffff) #define GET_INTERRUPT(v) (((v) >> 16) & 0x01) #define GET_SKIP(v) (((v) >> 17) & 0x01) #define GET_TAG(v) (((v) >> 18) & 0x03) #define GET_SY(v) (((v) >> 20) & 0x0f) #define GET_HEADER_LENGTH(v) (((v) >> 24) & 0xff) static int ioctl_queue_iso(struct client *client, void *buffer) { struct fw_cdev_queue_iso *request = buffer; struct fw_cdev_iso_packet __user *p, *end, *next; struct fw_iso_context *ctx = client->iso_context; unsigned long payload, buffer_end, header_length; u32 control; int count; struct { struct fw_iso_packet packet; u8 header[256]; } u; if (ctx == NULL || request->handle != 0) return -EINVAL; /* * 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; buffer_end = client->buffer.page_count << PAGE_SHIFT; if (request->data == 0 || client->buffer.pages == NULL || payload >= buffer_end) { payload = 0; buffer_end = 0; } p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets); if (!access_ok(VERIFY_READ, p, request->size)) return -EFAULT; end = (void __user *)p + request->size; count = 0; while (p < end) { if (get_user(control, &p->control)) return -EFAULT; u.packet.payload_length = GET_PAYLOAD_LENGTH(control); u.packet.interrupt = GET_INTERRUPT(control); u.packet.skip = GET_SKIP(control); u.packet.tag = GET_TAG(control); u.packet.sy = GET_SY(control); u.packet.header_length = GET_HEADER_LENGTH(control); 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 > buffer_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; return count; } static int ioctl_start_iso(struct client *client, void *buffer) { struct fw_cdev_start_iso *request = buffer; if (client->iso_context == NULL || request->handle != 0) return -EINVAL; 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 *buffer) { struct fw_cdev_stop_iso *request = buffer; if (client->iso_context == NULL || request->handle != 0) return -EINVAL; return fw_iso_context_stop(client->iso_context); } static int ioctl_get_cycle_timer(struct client *client, void *buffer) { struct fw_cdev_get_cycle_timer *request = buffer; struct fw_card *card = client->device->card; unsigned long long bus_time; struct timeval tv; unsigned long flags; preempt_disable(); local_irq_save(flags); bus_time = card->driver->get_bus_time(card); do_gettimeofday(&tv); local_irq_restore(flags); preempt_enable(); request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec; request->cycle_timer = bus_time & 0xffffffff; return 0; } static void iso_resource_work(struct work_struct *work) { struct iso_resource_event *e; struct iso_resource *r = container_of(work, struct iso_resource, work.work); struct client *client = r->client; int generation, channel, bandwidth, todo; bool skip, free, success; spin_lock_irq(&client->lock); generation = client->device->generation; todo = r->todo; /* Allow 1000ms grace period for other reallocations. */ if (todo == ISO_RES_ALLOC && time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) { if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3))) client_get(client); skip = true; } else { /* We could be called twice within the same generation. */ skip = todo == ISO_RES_REALLOC && r->generation == generation; } free = todo == ISO_RES_DEALLOC || todo == ISO_RES_ALLOC_ONCE || todo == ISO_RES_DEALLOC_ONCE; r->generation = generation; spin_unlock_irq(&client->lock); if (skip) goto out; bandwidth = r->bandwidth; fw_iso_resource_manage(client->device->card, generation, r->channels, &channel, &bandwidth, todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC || todo == ISO_RES_ALLOC_ONCE); /* * Is this generation outdated already? As long as this resource sticks * in the idr, it will be scheduled again for a newer generation or at * shutdown. */ if (channel == -EAGAIN && (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC)) goto out; success = channel >= 0 || bandwidth > 0; spin_lock_irq(&client->lock); /* * Transit from allocation to reallocation, except if the client * requested deallocation in the meantime. */ if (r->todo == ISO_RES_ALLOC) r->todo = ISO_RES_REALLOC; /* * Allocation or reallocation failure? Pull this resource out of the * idr and prepare for deletion, unless the client is shutting down. */ if (r->todo == ISO_RES_REALLOC && !success && !client->in_shutdown && idr_find(&client->resource_idr, r->resource.handle)) { idr_remove(&client->resource_idr, r->resource.handle); client_put(client); free = true; } spin_unlock_irq(&client->lock); if (todo == ISO_RES_ALLOC && channel >= 0) r->channels = 1ULL << (63 - channel); if (todo == ISO_RES_REALLOC && success) goto out; if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) { e = r->e_alloc; r->e_alloc = NULL; } else { e = r->e_dealloc; r->e_dealloc = NULL; } e->resource.handle = r->resource.handle; e->resource.channel = channel; e->resource.bandwidth = bandwidth; queue_event(client, &e->event, &e->resource, sizeof(e->resource), NULL, 0); if (free) { cancel_delayed_work(&r->work); kfree(r->e_alloc); kfree(r->e_dealloc); kfree(r); } out: client_put(client); } static int schedule_iso_resource(struct iso_resource *r) { int scheduled; client_get(r->client); scheduled = schedule_delayed_work(&r->work, 0); if (!scheduled) client_put(r->client); return scheduled; } static void release_iso_resource(struct client *client, struct client_resource *resource) { struct iso_resource *r = container_of(resource, struct iso_resource, resource); spin_lock_irq(&client->lock); r->todo = ISO_RES_DEALLOC; schedule_iso_resource(r); spin_unlock_irq(&client->lock); } static int init_iso_resource(struct client *client, struct fw_cdev_allocate_iso_resource *request, int todo) { struct iso_resource_event *e1, *e2; struct iso_resource *r; int ret; if ((request->channels == 0 && request->bandwidth == 0) || request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL || request->bandwidth < 0) return -EINVAL; r = kmalloc(sizeof(*r), GFP_KERNEL); e1 = kmalloc(sizeof(*e1), GFP_KERNEL); e2 = kmalloc(sizeof(*e2), GFP_KERNEL); if (r == NULL || e1 == NULL || e2 == NULL) { ret = -ENOMEM; goto fail; } INIT_DELAYED_WORK(&r->work, iso_resource_work); r->client = client; r->todo = todo; r->generation = -1; r->channels = request->channels; r->bandwidth = request->bandwidth; r->e_alloc = e1; r->e_dealloc = e2; e1->resource.closure = request->closure; e1->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED; e2->resource.closure = request->closure; e2->resource.type = FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED; if (todo == ISO_RES_ALLOC) { r->resource.release = release_iso_resource; ret = add_client_resource(client, &r->resource, GFP_KERNEL); } else { r->resource.release = NULL; r->resource.handle = -1; ret = schedule_iso_resource(r) ? 0 : -ENOMEM; } if (ret < 0) goto fail; request->handle = r->resource.handle; return 0; fail: kfree(r); kfree(e1); kfree(e2); return ret; } static int ioctl_allocate_iso_resource(struct client *client, void *buffer) { struct fw_cdev_allocate_iso_resource *request = buffer; return init_iso_resource(client, request, ISO_RES_ALLOC); } static int ioctl_deallocate_iso_resource(struct client *client, void *buffer) { struct fw_cdev_deallocate *request = buffer; return release_client_resource(client, request->handle, release_iso_resource, NULL); } static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer) { struct fw_cdev_allocate_iso_resource *request = buffer; return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE); } static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer) { struct fw_cdev_allocate_iso_resource *request = buffer; return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE); } static int ioctl_get_speed(struct client *client, void *buffer) { struct fw_cdev_get_speed *request = buffer; request->max_speed = client->device->max_speed; return 0; } static int ioctl_send_broadcast_request(struct client *client, void *buffer) { struct fw_cdev_send_request *request = buffer; switch (request->tcode) { case TCODE_WRITE_QUADLET_REQUEST: case TCODE_WRITE_BLOCK_REQUEST: break; default: return -EINVAL; } return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100); } static int (* const ioctl_handlers[])(struct client *client, void *buffer) = { ioctl_get_info, ioctl_send_request, ioctl_allocate, ioctl_deallocate, ioctl_send_response, ioctl_initiate_bus_reset, ioctl_add_descriptor, ioctl_remove_descriptor, ioctl_create_iso_context, ioctl_queue_iso, ioctl_start_iso, ioctl_stop_iso, ioctl_get_cycle_timer, ioctl_allocate_iso_resource, ioctl_deallocate_iso_resource, ioctl_allocate_iso_resource_once, ioctl_deallocate_iso_resource_once, ioctl_get_speed, ioctl_send_broadcast_request, }; static int dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg) { char buffer[256]; int ret; if (_IOC_TYPE(cmd) != '#' || _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers)) return -EINVAL; if (_IOC_DIR(cmd) & _IOC_WRITE) { if (_IOC_SIZE(cmd) > sizeof(buffer) || copy_from_user(buffer, arg, _IOC_SIZE(cmd))) return -EFAULT; } ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer); if (ret < 0) return ret; if (_IOC_DIR(cmd) & _IOC_READ) { if (_IOC_SIZE(cmd) > sizeof(buffer) || copy_to_user(arg, buffer, _IOC_SIZE(cmd))) return -EFAULT; } return ret; } static long fw_device_op_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct client *client = file->private_data; if (fw_device_is_shutdown(client->device)) return -ENODEV; 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; if (fw_device_is_shutdown(client->device)) return -ENODEV; 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, ret; if (fw_device_is_shutdown(client->device)) return -ENODEV; /* 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; ret = fw_iso_buffer_init(&client->buffer, client->device->card, page_count, direction); if (ret < 0) return ret; ret = fw_iso_buffer_map(&client->buffer, vma); if (ret < 0) fw_iso_buffer_destroy(&client->buffer, client->device->card); return ret; } static int shutdown_resource(int id, void *p, void *data) { struct client_resource *r = p; struct client *client = data; r->release(client, r); client_put(client); return 0; } static int fw_device_op_release(struct inode *inode, struct file *file) { struct client *client = file->private_data; struct event *e, *next_e; unsigned long flags; mutex_lock(&client->device->client_list_mutex); list_del(&client->link); mutex_unlock(&client->device->client_list_mutex); if (client->buffer.pages) fw_iso_buffer_destroy(&client->buffer, client->device->card); if (client->iso_context) fw_iso_context_destroy(client->iso_context); /* Freeze client->resource_idr and client->event_list */ spin_lock_irqsave(&client->lock, flags); client->in_shutdown = true; spin_unlock_irqrestore(&client->lock, flags); idr_for_each(&client->resource_idr, shutdown_resource, client); idr_remove_all(&client->resource_idr); idr_destroy(&client->resource_idr); list_for_each_entry_safe(e, next_e, &client->event_list, link) kfree(e); client_put(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 };