diff options
Diffstat (limited to 'kernel/drivers/firewire/core-cdev.c')
| -rw-r--r-- | kernel/drivers/firewire/core-cdev.c | 1815 |
1 files changed, 1815 insertions, 0 deletions
diff --git a/kernel/drivers/firewire/core-cdev.c b/kernel/drivers/firewire/core-cdev.c new file mode 100644 index 000000000..2a3973a7c --- /dev/null +++ b/kernel/drivers/firewire/core-cdev.c @@ -0,0 +1,1815 @@ +/* + * 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/bug.h> +#include <linux/compat.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/dma-mapping.h> +#include <linux/errno.h> +#include <linux/firewire.h> +#include <linux/firewire-cdev.h> +#include <linux/idr.h> +#include <linux/irqflags.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/sched.h> /* required for linux/wait.h */ +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/string.h> +#include <linux/time.h> +#include <linux/uaccess.h> +#include <linux/vmalloc.h> +#include <linux/wait.h> +#include <linux/workqueue.h> + + +#include "core.h" + +/* + * ABI version history is documented in linux/firewire-cdev.h. + */ +#define FW_CDEV_KERNEL_VERSION 5 +#define FW_CDEV_VERSION_EVENT_REQUEST2 4 +#define FW_CDEV_VERSION_ALLOCATE_REGION_END 4 +#define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5 + +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; + wait_queue_head_t tx_flush_wait; + u64 bus_reset_closure; + + struct fw_iso_context *iso_context; + u64 iso_closure; + struct fw_iso_buffer buffer; + unsigned long vm_start; + bool buffer_is_mapped; + + struct list_head phy_receiver_link; + u64 phy_receiver_closure; + + 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_card *card; + 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 release_iso_resource(struct client *, struct client_resource *); + +static void schedule_iso_resource(struct iso_resource *r, unsigned long delay) +{ + client_get(r->client); + if (!queue_delayed_work(fw_workqueue, &r->work, delay)) + client_put(r->client); +} + +static void schedule_if_iso_resource(struct client_resource *resource) +{ + if (resource->release == release_iso_resource) + schedule_iso_resource(container_of(resource, + struct iso_resource, resource), 0); +} + +/* + * 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; + union { + struct fw_cdev_event_request request; + struct fw_cdev_event_request2 request2; + } req; +}; + +struct iso_interrupt_event { + struct event event; + struct fw_cdev_event_iso_interrupt interrupt; +}; + +struct iso_interrupt_mc_event { + struct event event; + struct fw_cdev_event_iso_interrupt_mc interrupt; +}; + +struct iso_resource_event { + struct event event; + struct fw_cdev_event_iso_resource iso_resource; +}; + +struct outbound_phy_packet_event { + struct event event; + struct client *client; + struct fw_packet p; + struct fw_cdev_event_phy_packet phy_packet; +}; + +struct inbound_phy_packet_event { + struct event event; + struct fw_cdev_event_phy_packet phy_packet; +}; + +#ifdef CONFIG_COMPAT +static void __user *u64_to_uptr(u64 value) +{ + if (is_compat_task()) + return compat_ptr(value); + else + return (void __user *)(unsigned long)value; +} + +static u64 uptr_to_u64(void __user *ptr) +{ + if (is_compat_task()) + return ptr_to_compat(ptr); + else + return (u64)(unsigned long)ptr; +} +#else +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; +} +#endif /* CONFIG_COMPAT */ + +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); + init_waitqueue_head(&client->tx_flush_wait); + INIT_LIST_HEAD(&client->phy_receiver_link); + INIT_LIST_HEAD(&client->link); + kref_init(&client->kref); + + file->private_data = client; + + return nonseekable_open(inode, file); +} + +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 = card->bm_node_id; + 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) +{ + schedule_if_iso_resource(p); + + 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) + 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); +} + +union ioctl_arg { + struct fw_cdev_get_info get_info; + struct fw_cdev_send_request send_request; + struct fw_cdev_allocate allocate; + struct fw_cdev_deallocate deallocate; + struct fw_cdev_send_response send_response; + struct fw_cdev_initiate_bus_reset initiate_bus_reset; + struct fw_cdev_add_descriptor add_descriptor; + struct fw_cdev_remove_descriptor remove_descriptor; + struct fw_cdev_create_iso_context create_iso_context; + struct fw_cdev_queue_iso queue_iso; + struct fw_cdev_start_iso start_iso; + struct fw_cdev_stop_iso stop_iso; + struct fw_cdev_get_cycle_timer get_cycle_timer; + struct fw_cdev_allocate_iso_resource allocate_iso_resource; + struct fw_cdev_send_stream_packet send_stream_packet; + struct fw_cdev_get_cycle_timer2 get_cycle_timer2; + struct fw_cdev_send_phy_packet send_phy_packet; + struct fw_cdev_receive_phy_packets receive_phy_packets; + struct fw_cdev_set_iso_channels set_iso_channels; + struct fw_cdev_flush_iso flush_iso; +}; + +static int ioctl_get_info(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_get_info *a = &arg->get_info; + struct fw_cdev_event_bus_reset bus_reset; + unsigned long ret = 0; + + client->version = a->version; + a->version = FW_CDEV_KERNEL_VERSION; + a->card = client->device->card->index; + + down_read(&fw_device_rwsem); + + if (a->rom != 0) { + size_t want = a->rom_length; + size_t have = client->device->config_rom_length * 4; + + ret = copy_to_user(u64_to_uptr(a->rom), + client->device->config_rom, min(want, have)); + } + a->rom_length = client->device->config_rom_length * 4; + + up_read(&fw_device_rwsem); + + if (ret != 0) + return -EFAULT; + + mutex_lock(&client->device->client_list_mutex); + + client->bus_reset_closure = a->bus_reset_closure; + if (a->bus_reset != 0) { + fill_bus_reset_event(&bus_reset, client); + /* unaligned size of bus_reset is 36 bytes */ + ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36); + } + if (ret == 0 && list_empty(&client->link)) + list_add_tail(&client->link, &client->device->client_list); + + mutex_unlock(&client->device->client_list_mutex); + + return ret ? -EFAULT : 0; +} + +static int add_client_resource(struct client *client, + struct client_resource *resource, gfp_t gfp_mask) +{ + bool preload = !!(gfp_mask & __GFP_WAIT); + unsigned long flags; + int ret; + + if (preload) + idr_preload(gfp_mask); + spin_lock_irqsave(&client->lock, flags); + + if (client->in_shutdown) + ret = -ECANCELED; + else + ret = idr_alloc(&client->resource_idr, resource, 0, 0, + GFP_NOWAIT); + if (ret >= 0) { + resource->handle = ret; + client_get(client); + schedule_if_iso_resource(resource); + } + + spin_unlock_irqrestore(&client->lock, flags); + if (preload) + idr_preload_end(); + + return ret < 0 ? ret : 0; +} + +static int release_client_resource(struct client *client, u32 handle, + client_resource_release_fn_t release, + struct client_resource **return_resource) +{ + struct client_resource *resource; + + spin_lock_irq(&client->lock); + if (client->in_shutdown) + resource = NULL; + else + resource = idr_find(&client->resource_idr, handle); + if (resource && resource->release == release) + idr_remove(&client->resource_idr, handle); + spin_unlock_irq(&client->lock); + + if (!(resource && resource->release == release)) + return -EINVAL; + + if (return_resource) + *return_resource = resource; + else + resource->release(client, resource); + + client_put(client); + + return 0; +} + +static void release_transaction(struct client *client, + struct client_resource *resource) +{ +} + +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); + idr_remove(&client->resource_idr, e->r.resource.handle); + if (client->in_shutdown) + wake_up(&client->tx_flush_wait); + 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 idr'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; + + if (request->tcode == TCODE_WRITE_QUADLET_REQUEST && + request->length < 4) + 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; + + 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, union ioctl_arg *arg) +{ + switch (arg->send_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, &arg->send_request, client->device->node_id, + client->device->max_speed); +} + +static inline bool is_fcp_request(struct fw_request *request) +{ + return request == NULL; +} + +static void release_request(struct client *client, + struct client_resource *resource) +{ + struct inbound_transaction_resource *r = container_of(resource, + struct inbound_transaction_resource, resource); + + if (is_fcp_request(r->request)) + kfree(r->data); + else + fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR); + + fw_card_put(r->card); + kfree(r); +} + +static void handle_request(struct fw_card *card, struct fw_request *request, + int tcode, int destination, int source, + int generation, 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; + size_t event_size0; + void *fcp_frame = NULL; + int ret; + + /* card may be different from handler->client->device->card */ + fw_card_get(card); + + r = kmalloc(sizeof(*r), GFP_ATOMIC); + e = kmalloc(sizeof(*e), GFP_ATOMIC); + if (r == NULL || e == NULL) + goto failed; + + r->card = card; + r->request = request; + r->data = payload; + r->length = length; + + if (is_fcp_request(request)) { + /* + * FIXME: Let core-transaction.c manage a + * single reference-counted copy? + */ + fcp_frame = kmemdup(payload, length, GFP_ATOMIC); + if (fcp_frame == NULL) + goto failed; + + r->data = fcp_frame; + } + + r->resource.release = release_request; + ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC); + if (ret < 0) + goto failed; + + if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) { + struct fw_cdev_event_request *req = &e->req.request; + + if (tcode & 0x10) + tcode = TCODE_LOCK_REQUEST; + + req->type = FW_CDEV_EVENT_REQUEST; + req->tcode = tcode; + req->offset = offset; + req->length = length; + req->handle = r->resource.handle; + req->closure = handler->closure; + event_size0 = sizeof(*req); + } else { + struct fw_cdev_event_request2 *req = &e->req.request2; + + req->type = FW_CDEV_EVENT_REQUEST2; + req->tcode = tcode; + req->offset = offset; + req->source_node_id = source; + req->destination_node_id = destination; + req->card = card->index; + req->generation = generation; + req->length = length; + req->handle = r->resource.handle; + req->closure = handler->closure; + event_size0 = sizeof(*req); + } + + queue_event(handler->client, &e->event, + &e->req, event_size0, r->data, length); + return; + + failed: + kfree(r); + kfree(e); + kfree(fcp_frame); + + if (!is_fcp_request(request)) + fw_send_response(card, request, RCODE_CONFLICT_ERROR); + + fw_card_put(card); +} + +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, union ioctl_arg *arg) +{ + struct fw_cdev_allocate *a = &arg->allocate; + 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 = a->offset; + if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END) + region.end = a->offset + a->length; + else + region.end = a->region_end; + + r->handler.length = a->length; + r->handler.address_callback = handle_request; + r->handler.callback_data = r; + r->closure = a->closure; + r->client = client; + + ret = fw_core_add_address_handler(&r->handler, ®ion); + if (ret < 0) { + kfree(r); + return ret; + } + a->offset = r->handler.offset; + + 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; + } + a->handle = r->resource.handle; + + return 0; +} + +static int ioctl_deallocate(struct client *client, union ioctl_arg *arg) +{ + return release_client_resource(client, arg->deallocate.handle, + release_address_handler, NULL); +} + +static int ioctl_send_response(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_send_response *a = &arg->send_response; + struct client_resource *resource; + struct inbound_transaction_resource *r; + int ret = 0; + + if (release_client_resource(client, a->handle, + release_request, &resource) < 0) + return -EINVAL; + + r = container_of(resource, struct inbound_transaction_resource, + resource); + if (is_fcp_request(r->request)) + goto out; + + if (a->length != fw_get_response_length(r->request)) { + ret = -EINVAL; + kfree(r->request); + goto out; + } + if (copy_from_user(r->data, u64_to_uptr(a->data), a->length)) { + ret = -EFAULT; + kfree(r->request); + goto out; + } + fw_send_response(r->card, r->request, a->rcode); + out: + fw_card_put(r->card); + kfree(r); + + return ret; +} + +static int ioctl_initiate_bus_reset(struct client *client, union ioctl_arg *arg) +{ + fw_schedule_bus_reset(client->device->card, true, + arg->initiate_bus_reset.type == FW_CDEV_SHORT_RESET); + return 0; +} + +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, union ioctl_arg *arg) +{ + struct fw_cdev_add_descriptor *a = &arg->add_descriptor; + 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 (a->length > 256) + return -EINVAL; + + r = kmalloc(sizeof(*r) + a->length * 4, GFP_KERNEL); + if (r == NULL) + return -ENOMEM; + + if (copy_from_user(r->data, u64_to_uptr(a->data), a->length * 4)) { + ret = -EFAULT; + goto failed; + } + + r->descriptor.length = a->length; + r->descriptor.immediate = a->immediate; + r->descriptor.key = a->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; + } + a->handle = r->resource.handle; + + return 0; + failed: + kfree(r); + + return ret; +} + +static int ioctl_remove_descriptor(struct client *client, union ioctl_arg *arg) +{ + return release_client_resource(client, arg->remove_descriptor.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 = kmalloc(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 void iso_mc_callback(struct fw_iso_context *context, + dma_addr_t completed, void *data) +{ + struct client *client = data; + struct iso_interrupt_mc_event *e; + + e = kmalloc(sizeof(*e), GFP_ATOMIC); + if (e == NULL) + return; + + e->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT_MULTICHANNEL; + e->interrupt.closure = client->iso_closure; + e->interrupt.completed = fw_iso_buffer_lookup(&client->buffer, + completed); + queue_event(client, &e->event, &e->interrupt, + sizeof(e->interrupt), NULL, 0); +} + +static enum dma_data_direction iso_dma_direction(struct fw_iso_context *context) +{ + if (context->type == FW_ISO_CONTEXT_TRANSMIT) + return DMA_TO_DEVICE; + else + return DMA_FROM_DEVICE; +} + +static int ioctl_create_iso_context(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_create_iso_context *a = &arg->create_iso_context; + struct fw_iso_context *context; + fw_iso_callback_t cb; + int ret; + + BUILD_BUG_ON(FW_CDEV_ISO_CONTEXT_TRANSMIT != FW_ISO_CONTEXT_TRANSMIT || + FW_CDEV_ISO_CONTEXT_RECEIVE != FW_ISO_CONTEXT_RECEIVE || + FW_CDEV_ISO_CONTEXT_RECEIVE_MULTICHANNEL != + FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL); + + switch (a->type) { + case FW_ISO_CONTEXT_TRANSMIT: + if (a->speed > SCODE_3200 || a->channel > 63) + return -EINVAL; + + cb = iso_callback; + break; + + case FW_ISO_CONTEXT_RECEIVE: + if (a->header_size < 4 || (a->header_size & 3) || + a->channel > 63) + return -EINVAL; + + cb = iso_callback; + break; + + case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL: + cb = (fw_iso_callback_t)iso_mc_callback; + break; + + default: + return -EINVAL; + } + + context = fw_iso_context_create(client->device->card, a->type, + a->channel, a->speed, a->header_size, cb, client); + if (IS_ERR(context)) + return PTR_ERR(context); + if (client->version < FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW) + context->drop_overflow_headers = true; + + /* We only support one context at this time. */ + spin_lock_irq(&client->lock); + if (client->iso_context != NULL) { + spin_unlock_irq(&client->lock); + fw_iso_context_destroy(context); + + return -EBUSY; + } + if (!client->buffer_is_mapped) { + ret = fw_iso_buffer_map_dma(&client->buffer, + client->device->card, + iso_dma_direction(context)); + if (ret < 0) { + spin_unlock_irq(&client->lock); + fw_iso_context_destroy(context); + + return ret; + } + client->buffer_is_mapped = true; + } + client->iso_closure = a->closure; + client->iso_context = context; + spin_unlock_irq(&client->lock); + + a->handle = 0; + + return 0; +} + +static int ioctl_set_iso_channels(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_set_iso_channels *a = &arg->set_iso_channels; + struct fw_iso_context *ctx = client->iso_context; + + if (ctx == NULL || a->handle != 0) + return -EINVAL; + + return fw_iso_context_set_channels(ctx, &a->channels); +} + +/* 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, union ioctl_arg *arg) +{ + struct fw_cdev_queue_iso *a = &arg->queue_iso; + struct fw_cdev_iso_packet __user *p, *end, *next; + struct fw_iso_context *ctx = client->iso_context; + unsigned long payload, buffer_end, transmit_header_bytes = 0; + u32 control; + int count; + struct { + struct fw_iso_packet packet; + u8 header[256]; + } u; + + if (ctx == NULL || a->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 a->data pointer is ignored. + */ + payload = (unsigned long)a->data - client->vm_start; + buffer_end = client->buffer.page_count << PAGE_SHIFT; + if (a->data == 0 || client->buffer.pages == NULL || + payload >= buffer_end) { + payload = 0; + buffer_end = 0; + } + + if (ctx->type == FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL && payload & 3) + return -EINVAL; + + p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(a->packets); + if (!access_ok(VERIFY_READ, p, a->size)) + return -EFAULT; + + end = (void __user *)p + a->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); + + switch (ctx->type) { + case FW_ISO_CONTEXT_TRANSMIT: + if (u.packet.header_length & 3) + return -EINVAL; + transmit_header_bytes = u.packet.header_length; + break; + + case FW_ISO_CONTEXT_RECEIVE: + if (u.packet.header_length == 0 || + u.packet.header_length % ctx->header_size != 0) + return -EINVAL; + break; + + case FW_ISO_CONTEXT_RECEIVE_MULTICHANNEL: + if (u.packet.payload_length == 0 || + u.packet.payload_length & 3) + return -EINVAL; + break; + } + + next = (struct fw_cdev_iso_packet __user *) + &p->header[transmit_header_bytes / 4]; + if (next > end) + return -EINVAL; + if (__copy_from_user + (u.packet.header, p->header, transmit_header_bytes)) + 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++; + } + fw_iso_context_queue_flush(ctx); + + a->size -= uptr_to_u64(p) - a->packets; + a->packets = uptr_to_u64(p); + a->data = client->vm_start + payload; + + return count; +} + +static int ioctl_start_iso(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_start_iso *a = &arg->start_iso; + + BUILD_BUG_ON( + FW_CDEV_ISO_CONTEXT_MATCH_TAG0 != FW_ISO_CONTEXT_MATCH_TAG0 || + FW_CDEV_ISO_CONTEXT_MATCH_TAG1 != FW_ISO_CONTEXT_MATCH_TAG1 || + FW_CDEV_ISO_CONTEXT_MATCH_TAG2 != FW_ISO_CONTEXT_MATCH_TAG2 || + FW_CDEV_ISO_CONTEXT_MATCH_TAG3 != FW_ISO_CONTEXT_MATCH_TAG3 || + FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS != FW_ISO_CONTEXT_MATCH_ALL_TAGS); + + if (client->iso_context == NULL || a->handle != 0) + return -EINVAL; + + if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE && + (a->tags == 0 || a->tags > 15 || a->sync > 15)) + return -EINVAL; + + return fw_iso_context_start(client->iso_context, + a->cycle, a->sync, a->tags); +} + +static int ioctl_stop_iso(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_stop_iso *a = &arg->stop_iso; + + if (client->iso_context == NULL || a->handle != 0) + return -EINVAL; + + return fw_iso_context_stop(client->iso_context); +} + +static int ioctl_flush_iso(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_flush_iso *a = &arg->flush_iso; + + if (client->iso_context == NULL || a->handle != 0) + return -EINVAL; + + return fw_iso_context_flush_completions(client->iso_context); +} + +static int ioctl_get_cycle_timer2(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_get_cycle_timer2 *a = &arg->get_cycle_timer2; + struct fw_card *card = client->device->card; + struct timespec ts = {0, 0}; + u32 cycle_time; + int ret = 0; + + local_irq_disable(); + + cycle_time = card->driver->read_csr(card, CSR_CYCLE_TIME); + + switch (a->clk_id) { + case CLOCK_REALTIME: getnstimeofday(&ts); break; + case CLOCK_MONOTONIC: ktime_get_ts(&ts); break; + case CLOCK_MONOTONIC_RAW: getrawmonotonic(&ts); break; + default: + ret = -EINVAL; + } + + local_irq_enable(); + + a->tv_sec = ts.tv_sec; + a->tv_nsec = ts.tv_nsec; + a->cycle_timer = cycle_time; + + return ret; +} + +static int ioctl_get_cycle_timer(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_get_cycle_timer *a = &arg->get_cycle_timer; + struct fw_cdev_get_cycle_timer2 ct2; + + ct2.clk_id = CLOCK_REALTIME; + ioctl_get_cycle_timer2(client, (union ioctl_arg *)&ct2); + + a->local_time = ct2.tv_sec * USEC_PER_SEC + ct2.tv_nsec / NSEC_PER_USEC; + a->cycle_timer = ct2.cycle_timer; + + 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_before64(get_jiffies_64(), + client->device->card->reset_jiffies + HZ)) { + schedule_iso_resource(r, DIV_ROUND_UP(HZ, 3)); + 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->iso_resource.handle = r->resource.handle; + e->iso_resource.channel = channel; + e->iso_resource.bandwidth = bandwidth; + + queue_event(client, &e->event, + &e->iso_resource, sizeof(e->iso_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 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, 0); + 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) + 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->iso_resource.closure = request->closure; + e1->iso_resource.type = FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED; + e2->iso_resource.closure = request->closure; + e2->iso_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, 0); + } + 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, + union ioctl_arg *arg) +{ + return init_iso_resource(client, + &arg->allocate_iso_resource, ISO_RES_ALLOC); +} + +static int ioctl_deallocate_iso_resource(struct client *client, + union ioctl_arg *arg) +{ + return release_client_resource(client, + arg->deallocate.handle, release_iso_resource, NULL); +} + +static int ioctl_allocate_iso_resource_once(struct client *client, + union ioctl_arg *arg) +{ + return init_iso_resource(client, + &arg->allocate_iso_resource, ISO_RES_ALLOC_ONCE); +} + +static int ioctl_deallocate_iso_resource_once(struct client *client, + union ioctl_arg *arg) +{ + return init_iso_resource(client, + &arg->allocate_iso_resource, 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, union ioctl_arg *arg) +{ + return client->device->max_speed; +} + +static int ioctl_send_broadcast_request(struct client *client, + union ioctl_arg *arg) +{ + struct fw_cdev_send_request *a = &arg->send_request; + + switch (a->tcode) { + case TCODE_WRITE_QUADLET_REQUEST: + case TCODE_WRITE_BLOCK_REQUEST: + break; + default: + return -EINVAL; + } + + /* Security policy: Only allow accesses to Units Space. */ + if (a->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END) + return -EACCES; + + return init_request(client, a, LOCAL_BUS | 0x3f, SCODE_100); +} + +static int ioctl_send_stream_packet(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_send_stream_packet *a = &arg->send_stream_packet; + struct fw_cdev_send_request request; + int dest; + + if (a->speed > client->device->card->link_speed || + a->length > 1024 << a->speed) + return -EIO; + + if (a->tag > 3 || a->channel > 63 || a->sy > 15) + return -EINVAL; + + dest = fw_stream_packet_destination_id(a->tag, a->channel, a->sy); + request.tcode = TCODE_STREAM_DATA; + request.length = a->length; + request.closure = a->closure; + request.data = a->data; + request.generation = a->generation; + + return init_request(client, &request, dest, a->speed); +} + +static void outbound_phy_packet_callback(struct fw_packet *packet, + struct fw_card *card, int status) +{ + struct outbound_phy_packet_event *e = + container_of(packet, struct outbound_phy_packet_event, p); + + switch (status) { + /* expected: */ + case ACK_COMPLETE: e->phy_packet.rcode = RCODE_COMPLETE; break; + /* should never happen with PHY packets: */ + case ACK_PENDING: e->phy_packet.rcode = RCODE_COMPLETE; break; + case ACK_BUSY_X: + case ACK_BUSY_A: + case ACK_BUSY_B: e->phy_packet.rcode = RCODE_BUSY; break; + case ACK_DATA_ERROR: e->phy_packet.rcode = RCODE_DATA_ERROR; break; + case ACK_TYPE_ERROR: e->phy_packet.rcode = RCODE_TYPE_ERROR; break; + /* stale generation; cancelled; on certain controllers: no ack */ + default: e->phy_packet.rcode = status; break; + } + e->phy_packet.data[0] = packet->timestamp; + + queue_event(e->client, &e->event, &e->phy_packet, + sizeof(e->phy_packet) + e->phy_packet.length, NULL, 0); + client_put(e->client); +} + +static int ioctl_send_phy_packet(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_send_phy_packet *a = &arg->send_phy_packet; + struct fw_card *card = client->device->card; + struct outbound_phy_packet_event *e; + + /* Access policy: Allow this ioctl only on local nodes' device files. */ + if (!client->device->is_local) + return -ENOSYS; + + e = kzalloc(sizeof(*e) + 4, GFP_KERNEL); + if (e == NULL) + return -ENOMEM; + + client_get(client); + e->client = client; + e->p.speed = SCODE_100; + e->p.generation = a->generation; + e->p.header[0] = TCODE_LINK_INTERNAL << 4; + e->p.header[1] = a->data[0]; + e->p.header[2] = a->data[1]; + e->p.header_length = 12; + e->p.callback = outbound_phy_packet_callback; + e->phy_packet.closure = a->closure; + e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_SENT; + if (is_ping_packet(a->data)) + e->phy_packet.length = 4; + + card->driver->send_request(card, &e->p); + + return 0; +} + +static int ioctl_receive_phy_packets(struct client *client, union ioctl_arg *arg) +{ + struct fw_cdev_receive_phy_packets *a = &arg->receive_phy_packets; + struct fw_card *card = client->device->card; + + /* Access policy: Allow this ioctl only on local nodes' device files. */ + if (!client->device->is_local) + return -ENOSYS; + + spin_lock_irq(&card->lock); + + list_move_tail(&client->phy_receiver_link, &card->phy_receiver_list); + client->phy_receiver_closure = a->closure; + + spin_unlock_irq(&card->lock); + + return 0; +} + +void fw_cdev_handle_phy_packet(struct fw_card *card, struct fw_packet *p) +{ + struct client *client; + struct inbound_phy_packet_event *e; + unsigned long flags; + + spin_lock_irqsave(&card->lock, flags); + + list_for_each_entry(client, &card->phy_receiver_list, phy_receiver_link) { + e = kmalloc(sizeof(*e) + 8, GFP_ATOMIC); + if (e == NULL) + break; + + e->phy_packet.closure = client->phy_receiver_closure; + e->phy_packet.type = FW_CDEV_EVENT_PHY_PACKET_RECEIVED; + e->phy_packet.rcode = RCODE_COMPLETE; + e->phy_packet.length = 8; + e->phy_packet.data[0] = p->header[1]; + e->phy_packet.data[1] = p->header[2]; + queue_event(client, &e->event, + &e->phy_packet, sizeof(e->phy_packet) + 8, NULL, 0); + } + + spin_unlock_irqrestore(&card->lock, flags); +} + +static int (* const ioctl_handlers[])(struct client *, union ioctl_arg *) = { + [0x00] = ioctl_get_info, + [0x01] = ioctl_send_request, + [0x02] = ioctl_allocate, + [0x03] = ioctl_deallocate, + [0x04] = ioctl_send_response, + [0x05] = ioctl_initiate_bus_reset, + [0x06] = ioctl_add_descriptor, + [0x07] = ioctl_remove_descriptor, + [0x08] = ioctl_create_iso_context, + [0x09] = ioctl_queue_iso, + [0x0a] = ioctl_start_iso, + [0x0b] = ioctl_stop_iso, + [0x0c] = ioctl_get_cycle_timer, + [0x0d] = ioctl_allocate_iso_resource, + [0x0e] = ioctl_deallocate_iso_resource, + [0x0f] = ioctl_allocate_iso_resource_once, + [0x10] = ioctl_deallocate_iso_resource_once, + [0x11] = ioctl_get_speed, + [0x12] = ioctl_send_broadcast_request, + [0x13] = ioctl_send_stream_packet, + [0x14] = ioctl_get_cycle_timer2, + [0x15] = ioctl_send_phy_packet, + [0x16] = ioctl_receive_phy_packets, + [0x17] = ioctl_set_iso_channels, + [0x18] = ioctl_flush_iso, +}; + +static int dispatch_ioctl(struct client *client, + unsigned int cmd, void __user *arg) +{ + union ioctl_arg buffer; + int ret; + + if (fw_device_is_shutdown(client->device)) + return -ENODEV; + + if (_IOC_TYPE(cmd) != '#' || + _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers) || + _IOC_SIZE(cmd) > sizeof(buffer)) + return -ENOTTY; + + memset(&buffer, 0, sizeof(buffer)); + + if (_IOC_DIR(cmd) & _IOC_WRITE) + if (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 (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) +{ + return dispatch_ioctl(file->private_data, cmd, (void __user *)arg); +} + +#ifdef CONFIG_COMPAT +static long fw_device_op_compat_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + return dispatch_ioctl(file->private_data, 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; + 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; + + ret = fw_iso_buffer_alloc(&client->buffer, page_count); + if (ret < 0) + return ret; + + spin_lock_irq(&client->lock); + if (client->iso_context) { + ret = fw_iso_buffer_map_dma(&client->buffer, + client->device->card, + iso_dma_direction(client->iso_context)); + client->buffer_is_mapped = (ret == 0); + } + spin_unlock_irq(&client->lock); + if (ret < 0) + goto fail; + + ret = fw_iso_buffer_map_vma(&client->buffer, vma); + if (ret < 0) + goto fail; + + return 0; + fail: + fw_iso_buffer_destroy(&client->buffer, client->device->card); + return ret; +} + +static int is_outbound_transaction_resource(int id, void *p, void *data) +{ + struct client_resource *resource = p; + + return resource->release == release_transaction; +} + +static int has_outbound_transactions(struct client *client) +{ + int ret; + + spin_lock_irq(&client->lock); + ret = idr_for_each(&client->resource_idr, + is_outbound_transaction_resource, NULL); + spin_unlock_irq(&client->lock); + + return ret; +} + +static int shutdown_resource(int id, void *p, void *data) +{ + struct client_resource *resource = p; + struct client *client = data; + + resource->release(client, resource); + 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 *event, *next_event; + + spin_lock_irq(&client->device->card->lock); + list_del(&client->phy_receiver_link); + spin_unlock_irq(&client->device->card->lock); + + 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); + + wait_event(client->tx_flush_wait, !has_outbound_transactions(client)); + + idr_for_each(&client->resource_idr, shutdown_resource, client); + idr_destroy(&client->resource_idr); + + list_for_each_entry_safe(event, next_event, &client->event_list, link) + kfree(event); + + 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, + .llseek = no_llseek, + .open = fw_device_op_open, + .read = fw_device_op_read, + .unlocked_ioctl = fw_device_op_ioctl, + .mmap = fw_device_op_mmap, + .release = fw_device_op_release, + .poll = fw_device_op_poll, +#ifdef CONFIG_COMPAT + .compat_ioctl = fw_device_op_compat_ioctl, +#endif +}; |