diff options
Diffstat (limited to 'drivers/firewire/fw-cdev.c')
| -rw-r--r-- | drivers/firewire/fw-cdev.c | 1458 |
1 files changed, 0 insertions, 1458 deletions
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c deleted file mode 100644 index 042c0454047..00000000000 --- a/drivers/firewire/fw-cdev.c +++ /dev/null @@ -1,1458 +0,0 @@ -/* - * Char device for device raw access - * - * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net> - * - * 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 <linux/compat.h> -#include <linux/delay.h> -#include <linux/device.h> -#include <linux/errno.h> -#include <linux/firewire.h> -#include <linux/firewire-cdev.h> -#include <linux/idr.h> -#include <linux/jiffies.h> -#include <linux/kernel.h> -#include <linux/kref.h> -#include <linux/mm.h> -#include <linux/module.h> -#include <linux/mutex.h> -#include <linux/poll.h> -#include <linux/preempt.h> -#include <linux/spinlock.h> -#include <linux/time.h> -#include <linux/vmalloc.h> -#include <linux/wait.h> -#include <linux/workqueue.h> - -#include <asm/system.h> -#include <asm/uaccess.h> - -#include "core.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 void 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) -{ - 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_irq(&client->lock); - event = list_first_entry(&client->event_list, struct event, link); - list_del(&event->link); - spin_unlock_irq(&client->lock); - - 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; - - spin_lock_irq(&card->lock); - - 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_irq(&card->lock); -} - -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; - - spin_lock_irq(&client->lock); - 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_irq(&client->lock); - - 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; - - if (request->tcode != TCODE_STREAM_DATA && - (request->length > 4096 || request->length > 512 << speed)) - return -EIO; - - 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, destination_id, request->generation, - speed, request->offset, e->response.data, - request->length, complete_transaction, e); - return 0; - - 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_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; - - /* Access policy: Allow this ioctl only on local nodes' device files. */ - if (!client->device->is_local) - return -ENOSYS; - - 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 << 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 void schedule_iso_resource(struct iso_resource *r) -{ - client_get(r->client); - if (!schedule_delayed_work(&r->work, 0)) - client_put(r->client); -} - -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); - if (ret < 0) - goto fail; - } else { - r->resource.release = NULL; - r->resource.handle = -1; - schedule_iso_resource(r); - } - 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); -} - -/* - * Returns a speed code: Maximum speed to or from this device, - * limited by the device's link speed, the local node's link speed, - * and all PHY port speeds between the two links. - */ -static int ioctl_get_speed(struct client *client, void *buffer) -{ - return client->device->max_speed; -} - -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; - } - - /* Security policy: Only allow accesses to Units Space. */ - if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END) - return -EACCES; - - return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100); -} - -static int ioctl_send_stream_packet(struct client *client, void *buffer) -{ - struct fw_cdev_send_stream_packet *p = buffer; - struct fw_cdev_send_request request; - int dest; - - if (p->speed > client->device->card->link_speed || - p->length > 1024 << p->speed) - return -EIO; - - if (p->tag > 3 || p->channel > 63 || p->sy > 15) - return -EINVAL; - - dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy); - request.tcode = TCODE_STREAM_DATA; - request.length = p->length; - request.closure = p->closure; - request.data = p->data; - request.generation = p->generation; - - return init_request(client, &request, dest, p->speed); -} - -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, - ioctl_send_stream_packet, -}; - -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; - - mutex_lock(&client->device->client_list_mutex); - list_del(&client->link); - mutex_unlock(&client->device->client_list_mutex); - - if (client->iso_context) - fw_iso_context_destroy(client->iso_context); - - if (client->buffer.pages) - fw_iso_buffer_destroy(&client->buffer, client->device->card); - - /* Freeze client->resource_idr and client->event_list */ - spin_lock_irq(&client->lock); - client->in_shutdown = true; - spin_unlock_irq(&client->lock); - - 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 -}; |