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WSL2-Linux-Kernel
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WSL2-Linux-Kernel/drivers/firewire/core-cdev.c

1461 строка
36 KiB
C
Исходник Ответственный История

/*
* 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/uaccess.h>
#include <linux/vmalloc.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
#include <asm/system.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;
__be32 transaction_data[2];
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, &region);
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,
r->transaction_data);
/*
* 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
};
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