Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2993080AbXEBMSm (ORCPT ); Wed, 2 May 2007 08:18:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755176AbXEBMSe (ORCPT ); Wed, 2 May 2007 08:18:34 -0400 Received: from einhorn.in-berlin.de ([192.109.42.8]:58898 "EHLO einhorn.in-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2993079AbXEBMSH (ORCPT ); Wed, 2 May 2007 08:18:07 -0400 X-Envelope-From: stefanr@s5r6.in-berlin.de Date: Wed, 2 May 2007 14:17:26 +0200 (CEST) From: Stefan Richter Subject: [PATCH 3/6] firewire: char device interface To: linux-kernel@vger.kernel.org cc: Kristian H??gsberg , Linus Torvalds , Andrew Morton , linux1394-devel , Christoph Hellwig In-Reply-To: Message-ID: References: <4637A29F.6070302@redhat.com> <20070502090007.GA28174@infradead.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; CHARSET=us-ascii Content-Disposition: INLINE Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 33432 Lines: 1249 Signed-off-by: Stefan Richter --- drivers/firewire/fw-cdev.c | 954 ++++++++++++++++++++++++++++++++++ include/linux/firewire-cdev.h | 268 +++++++++ 2 files changed, 1222 insertions(+) Index: linux_juju/include/linux/firewire-cdev.h =================================================================== --- /dev/null +++ linux_juju/include/linux/firewire-cdev.h @@ -0,0 +1,268 @@ +/* -*- c-basic-offset: 8 -*- + * + * fw-device-cdev.h -- Char device interface. + * + * Copyright (C) 2005-2006 Kristian Hoegsberg + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#ifndef __fw_cdev_h +#define __fw_cdev_h + +#include +#include + +#define TCODE_WRITE_QUADLET_REQUEST 0 +#define TCODE_WRITE_BLOCK_REQUEST 1 +#define TCODE_WRITE_RESPONSE 2 +#define TCODE_READ_QUADLET_REQUEST 4 +#define TCODE_READ_BLOCK_REQUEST 5 +#define TCODE_READ_QUADLET_RESPONSE 6 +#define TCODE_READ_BLOCK_RESPONSE 7 +#define TCODE_CYCLE_START 8 +#define TCODE_LOCK_REQUEST 9 +#define TCODE_STREAM_DATA 10 +#define TCODE_LOCK_RESPONSE 11 + +#define TCODE_LOCK_MASK_SWAP 0x11 +#define TCODE_LOCK_COMPARE_SWAP 0x12 +#define TCODE_LOCK_FETCH_ADD 0x13 +#define TCODE_LOCK_LITTLE_ADD 0x14 +#define TCODE_LOCK_BOUNDED_ADD 0x15 +#define TCODE_LOCK_WRAP_ADD 0x16 +#define TCODE_LOCK_VENDOR_DEPENDENT 0x17 + +#define RCODE_COMPLETE 0x0 +#define RCODE_CONFLICT_ERROR 0x4 +#define RCODE_DATA_ERROR 0x5 +#define RCODE_TYPE_ERROR 0x6 +#define RCODE_ADDRESS_ERROR 0x7 + +#define RCODE_SEND_ERROR 0x10 +#define RCODE_CANCELLED 0x11 +#define RCODE_BUSY 0x12 +#define RCODE_GENERATION 0x13 +#define RCODE_NO_ACK 0x14 + +#define SCODE_100 0x0 +#define SCODE_200 0x1 +#define SCODE_400 0x2 +#define SCODE_800 0x3 +#define SCODE_1600 0x4 +#define SCODE_3200 0x5 + +#define FW_CDEV_EVENT_BUS_RESET 0x00 +#define FW_CDEV_EVENT_RESPONSE 0x01 +#define FW_CDEV_EVENT_REQUEST 0x02 +#define FW_CDEV_EVENT_ISO_INTERRUPT 0x03 + +/* The 'closure' fields are for user space to use. Data passed in the + * 'closure' field for a request will be returned in the corresponding + * event. It's a 64-bit type so that it's a fixed size type big + * enough to hold a pointer on all platforms. */ + +struct fw_cdev_event_common { + __u64 closure; + __u32 type; +}; + +struct fw_cdev_event_bus_reset { + __u64 closure; + __u32 type; + __u32 node_id; + __u32 local_node_id; + __u32 bm_node_id; + __u32 irm_node_id; + __u32 root_node_id; + __u32 generation; +}; + +struct fw_cdev_event_response { + __u64 closure; + __u32 type; + __u32 rcode; + __u32 length; + __u32 data[0]; +}; + +struct fw_cdev_event_request { + __u64 closure; + __u32 type; + __u32 tcode; + __u64 offset; + __u32 handle; + __u32 length; + __u32 data[0]; +}; + +struct fw_cdev_event_iso_interrupt { + __u64 closure; + __u32 type; + __u32 cycle; + __u32 header_length; /* Length in bytes of following headers. */ + __u32 header[0]; +}; + +union fw_cdev_event { + struct fw_cdev_event_common common; + struct fw_cdev_event_bus_reset bus_reset; + struct fw_cdev_event_response response; + struct fw_cdev_event_request request; + struct fw_cdev_event_iso_interrupt iso_interrupt; +}; + +#define FW_CDEV_IOC_GET_INFO _IOWR('#', 0x00, struct fw_cdev_get_info) +#define FW_CDEV_IOC_SEND_REQUEST _IOW('#', 0x01, struct fw_cdev_send_request) +#define FW_CDEV_IOC_ALLOCATE _IOWR('#', 0x02, struct fw_cdev_allocate) +#define FW_CDEV_IOC_DEALLOCATE _IOW('#', 0x03, struct fw_cdev_deallocate) +#define FW_CDEV_IOC_SEND_RESPONSE _IOW('#', 0x04, struct fw_cdev_send_response) +#define FW_CDEV_IOC_INITIATE_BUS_RESET _IOW('#', 0x05, struct fw_cdev_initiate_bus_reset) +#define FW_CDEV_IOC_ADD_DESCRIPTOR _IOWR('#', 0x06, struct fw_cdev_add_descriptor) +#define FW_CDEV_IOC_REMOVE_DESCRIPTOR _IOW('#', 0x07, struct fw_cdev_remove_descriptor) + +#define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IOWR('#', 0x08, struct fw_cdev_create_iso_context) +#define FW_CDEV_IOC_QUEUE_ISO _IOWR('#', 0x09, struct fw_cdev_queue_iso) +#define FW_CDEV_IOC_START_ISO _IOW('#', 0x0a, struct fw_cdev_start_iso) +#define FW_CDEV_IOC_STOP_ISO _IOW('#', 0x0b, struct fw_cdev_stop_iso) + +/* FW_CDEV_VERSION History + * + * 1 Feb 18, 2007: Initial version. + */ +#define FW_CDEV_VERSION 1 + +struct fw_cdev_get_info { + /* The version field is just a running serial number. We + * never break backwards compatibility. Userspace passes in + * the version it expects and the kernel passes back the + * highest version it can provide. Even if the structs in + * this interface are extended in a later version, the kernel + * will not copy back more data than what was present in the + * interface version userspace expects. */ + __u32 version; + + /* If non-zero, at most rom_length bytes of config rom will be + * copied into that user space address. In either case, + * rom_length is updated with the actual length of the config + * rom. */ + __u32 rom_length; + __u64 rom; + + /* If non-zero, a fw_cdev_event_bus_reset struct will be + * copied here with the current state of the bus. This does + * not cause a bus reset to happen. The value of closure in + * this and sub-sequent bus reset events is set to + * bus_reset_closure. */ + __u64 bus_reset; + __u64 bus_reset_closure; + + /* The index of the card this devices belongs to. */ + __u32 card; +}; + +struct fw_cdev_send_request { + __u32 tcode; + __u32 length; + __u64 offset; + __u64 closure; + __u64 data; + __u32 generation; +}; + +struct fw_cdev_send_response { + __u32 rcode; + __u32 length; + __u64 data; + __u32 handle; +}; + +struct fw_cdev_allocate { + __u64 offset; + __u64 closure; + __u32 length; + __u32 handle; +}; + +struct fw_cdev_deallocate { + __u32 handle; +}; + +#define FW_CDEV_LONG_RESET 0 +#define FW_CDEV_SHORT_RESET 1 + +struct fw_cdev_initiate_bus_reset { + __u32 type; +}; + +struct fw_cdev_add_descriptor { + __u32 immediate; + __u32 key; + __u64 data; + __u32 length; + __u32 handle; +}; + +struct fw_cdev_remove_descriptor { + __u32 handle; +}; + +#define FW_CDEV_ISO_CONTEXT_TRANSMIT 0 +#define FW_CDEV_ISO_CONTEXT_RECEIVE 1 + +#define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1 +#define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2 +#define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4 +#define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8 +#define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15 + +struct fw_cdev_create_iso_context { + __u32 type; + __u32 header_size; + __u32 channel; + __u32 speed; + __u64 closure; + __u32 handle; +}; + +struct fw_cdev_iso_packet { + __u16 payload_length; /* Length of indirect payload. */ + __u32 interrupt : 1; /* Generate interrupt on this packet */ + __u32 skip : 1; /* Set to not send packet at all. */ + __u32 tag : 2; + __u32 sy : 4; + __u32 header_length : 8; /* Length of immediate header. */ + __u32 header[0]; +}; + +struct fw_cdev_queue_iso { + __u64 packets; + __u64 data; + __u32 size; + __u32 handle; +}; + +struct fw_cdev_start_iso { + __s32 cycle; + __u32 sync; + __u32 tags; + __u32 handle; +}; + +struct fw_cdev_stop_iso { + __u32 handle; +}; + +#endif /* __fw_cdev_h */ Index: linux_juju/drivers/firewire/fw-cdev.c =================================================================== --- /dev/null +++ linux_juju/drivers/firewire/fw-cdev.c @@ -0,0 +1,954 @@ +/* -*- c-basic-offset: 8 -*- + * + * fw-device-cdev.c - Char device for device raw access + * + * Copyright (C) 2005-2006 Kristian Hoegsberg + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software Foundation, + * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "fw-transaction.h" +#include "fw-topology.h" +#include "fw-device.h" + +/* dequeue_event() just kfree()'s the event, so the event has to be + * the first field in the struct. */ + +struct client; +struct client_resource { + struct list_head link; + void (*release)(struct client *client, struct client_resource *r); + u32 handle; +}; + +struct event { + struct { void *data; size_t size; } v[2]; + struct list_head link; +}; + +struct bus_reset { + struct event event; + struct fw_cdev_event_bus_reset reset; +}; + +struct response { + struct event event; + struct fw_transaction transaction; + struct client *client; + struct client_resource resource; + struct fw_cdev_event_response response; +}; + +struct iso_interrupt { + struct event event; + struct fw_cdev_event_iso_interrupt interrupt; +}; + +struct client { + u32 version; + struct fw_device *device; + spinlock_t lock; + u32 resource_handle; + struct list_head resource_list; + 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; +}; + +static inline void __user * +u64_to_uptr(__u64 value) +{ + return (void __user *)(unsigned long)value; +} + +static inline __u64 +uptr_to_u64(void __user *ptr) +{ + return (__u64)(unsigned long)ptr; +} + +static int fw_device_op_open(struct inode *inode, struct file *file) +{ + struct fw_device *device; + struct client *client; + unsigned long flags; + + device = fw_device_from_devt(inode->i_rdev); + if (device == NULL) + return -ENODEV; + + client = kzalloc(sizeof *client, GFP_KERNEL); + if (client == NULL) + return -ENOMEM; + + client->device = fw_device_get(device); + INIT_LIST_HEAD(&client->event_list); + INIT_LIST_HEAD(&client->resource_list); + spin_lock_init(&client->lock); + init_waitqueue_head(&client->wait); + + file->private_data = client; + + spin_lock_irqsave(&device->card->lock, flags); + list_add_tail(&client->link, &device->client_list); + spin_unlock_irqrestore(&device->card->lock, flags); + + return 0; +} + +static void queue_event(struct client *client, struct event *event, + void *data0, size_t size0, void *data1, size_t size1) +{ + unsigned long flags; + + event->v[0].data = data0; + event->v[0].size = size0; + event->v[1].data = data1; + event->v[1].size = size1; + + spin_lock_irqsave(&client->lock, flags); + + list_add_tail(&event->link, &client->event_list); + wake_up_interruptible(&client->wait); + + spin_unlock_irqrestore(&client->lock, flags); +} + +static int +dequeue_event(struct client *client, char __user *buffer, size_t count) +{ + unsigned long flags; + struct event *event; + size_t size, total; + int i, retval; + + retval = wait_event_interruptible(client->wait, + !list_empty(&client->event_list) || + fw_device_is_shutdown(client->device)); + if (retval < 0) + return retval; + + if (list_empty(&client->event_list) && + fw_device_is_shutdown(client->device)) + return -ENODEV; + + spin_lock_irqsave(&client->lock, flags); + event = container_of(client->event_list.next, struct event, link); + list_del(&event->link); + spin_unlock_irqrestore(&client->lock, flags); + + total = 0; + for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { + size = min(event->v[i].size, count - total); + if (copy_to_user(buffer + total, event->v[i].data, size)) { + retval = -EFAULT; + goto out; + } + total += size; + } + retval = total; + + out: + kfree(event); + + return retval; +} + +static ssize_t +fw_device_op_read(struct file *file, + char __user *buffer, size_t count, loff_t *offset) +{ + struct client *client = file->private_data; + + return dequeue_event(client, buffer, count); +} + +static void +fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, + struct client *client) +{ + struct fw_card *card = client->device->card; + + event->closure = client->bus_reset_closure; + event->type = FW_CDEV_EVENT_BUS_RESET; + 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; + event->generation = card->generation; +} + +static void +for_each_client(struct fw_device *device, + void (*callback)(struct client *client)) +{ + struct fw_card *card = device->card; + struct client *c; + unsigned long flags; + + spin_lock_irqsave(&card->lock, flags); + + list_for_each_entry(c, &device->client_list, link) + callback(c); + + spin_unlock_irqrestore(&card->lock, flags); +} + +static void +queue_bus_reset_event(struct client *client) +{ + struct bus_reset *bus_reset; + + bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC); + if (bus_reset == NULL) { + fw_notify("Out of memory when allocating bus reset event\n"); + return; + } + + fill_bus_reset_event(&bus_reset->reset, client); + + queue_event(client, &bus_reset->event, + &bus_reset->reset, sizeof bus_reset->reset, NULL, 0); +} + +void fw_device_cdev_update(struct fw_device *device) +{ + for_each_client(device, queue_bus_reset_event); +} + +static void wake_up_client(struct client *client) +{ + wake_up_interruptible(&client->wait); +} + +void fw_device_cdev_remove(struct fw_device *device) +{ + for_each_client(device, wake_up_client); +} + +static int ioctl_get_info(struct client *client, void *buffer) +{ + struct fw_cdev_get_info *get_info = buffer; + struct fw_cdev_event_bus_reset bus_reset; + + client->version = get_info->version; + get_info->version = FW_CDEV_VERSION; + + if (get_info->rom != 0) { + void __user *uptr = u64_to_uptr(get_info->rom); + size_t want = get_info->rom_length; + size_t have = client->device->config_rom_length * 4; + + if (copy_to_user(uptr, client->device->config_rom, + min(want, have))) + return -EFAULT; + } + get_info->rom_length = client->device->config_rom_length * 4; + + 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; + } + + get_info->card = client->device->card->index; + + return 0; +} + +static void +add_client_resource(struct client *client, struct client_resource *resource) +{ + unsigned long flags; + + spin_lock_irqsave(&client->lock, flags); + list_add_tail(&resource->link, &client->resource_list); + resource->handle = client->resource_handle++; + spin_unlock_irqrestore(&client->lock, flags); +} + +static int +release_client_resource(struct client *client, u32 handle, + struct client_resource **resource) +{ + struct client_resource *r; + unsigned long flags; + + spin_lock_irqsave(&client->lock, flags); + list_for_each_entry(r, &client->resource_list, link) { + if (r->handle == handle) { + list_del(&r->link); + break; + } + } + spin_unlock_irqrestore(&client->lock, flags); + + if (&r->link == &client->resource_list) + return -EINVAL; + + if (resource) + *resource = r; + else + r->release(client, r); + + return 0; +} + +static void +release_transaction(struct client *client, struct client_resource *resource) +{ + struct response *response = + container_of(resource, struct response, resource); + + fw_cancel_transaction(client->device->card, &response->transaction); +} + +static void +complete_transaction(struct fw_card *card, int rcode, + void *payload, size_t length, void *data) +{ + struct response *response = data; + struct client *client = response->client; + unsigned long flags; + + if (length < response->response.length) + response->response.length = length; + if (rcode == RCODE_COMPLETE) + memcpy(response->response.data, payload, + response->response.length); + + spin_lock_irqsave(&client->lock, flags); + list_del(&response->resource.link); + spin_unlock_irqrestore(&client->lock, flags); + + response->response.type = FW_CDEV_EVENT_RESPONSE; + response->response.rcode = rcode; + queue_event(client, &response->event, + &response->response, sizeof response->response, + response->response.data, response->response.length); +} + +static ssize_t ioctl_send_request(struct client *client, void *buffer) +{ + struct fw_device *device = client->device; + struct fw_cdev_send_request *request = buffer; + struct response *response; + + /* What is the biggest size we'll accept, really? */ + if (request->length > 4096) + return -EINVAL; + + response = kmalloc(sizeof *response + request->length, GFP_KERNEL); + if (response == NULL) + return -ENOMEM; + + response->client = client; + response->response.length = request->length; + response->response.closure = request->closure; + + if (request->data && + copy_from_user(response->response.data, + u64_to_uptr(request->data), request->length)) { + kfree(response); + return -EFAULT; + } + + response->resource.release = release_transaction; + add_client_resource(client, &response->resource); + + fw_send_request(device->card, &response->transaction, + request->tcode & 0x1f, + device->node->node_id, + request->generation, + device->node->max_speed, + request->offset, + response->response.data, request->length, + complete_transaction, response); + + if (request->data) + return sizeof request + request->length; + else + return sizeof request; +} + +struct address_handler { + struct fw_address_handler handler; + __u64 closure; + struct client *client; + struct client_resource resource; +}; + +struct request { + struct fw_request *request; + void *data; + size_t length; + struct client_resource resource; +}; + +struct request_event { + struct event event; + struct fw_cdev_event_request request; +}; + +static void +release_request(struct client *client, struct client_resource *resource) +{ + struct request *request = + container_of(resource, struct request, resource); + + fw_send_response(client->device->card, request->request, + RCODE_CONFLICT_ERROR); + kfree(request); +} + +static void +handle_request(struct fw_card *card, struct fw_request *r, + int tcode, int destination, int source, + int generation, int speed, + unsigned long long offset, + void *payload, size_t length, void *callback_data) +{ + struct address_handler *handler = callback_data; + struct request *request; + struct request_event *e; + struct client *client = handler->client; + + request = kmalloc(sizeof *request, GFP_ATOMIC); + e = kmalloc(sizeof *e, GFP_ATOMIC); + if (request == NULL || e == NULL) { + kfree(request); + kfree(e); + fw_send_response(card, r, RCODE_CONFLICT_ERROR); + return; + } + + request->request = r; + request->data = payload; + request->length = length; + + request->resource.release = release_request; + add_client_resource(client, &request->resource); + + e->request.type = FW_CDEV_EVENT_REQUEST; + e->request.tcode = tcode; + e->request.offset = offset; + e->request.length = length; + e->request.handle = request->resource.handle; + e->request.closure = handler->closure; + + queue_event(client, &e->event, + &e->request, sizeof e->request, payload, length); +} + +static void +release_address_handler(struct client *client, + struct client_resource *resource) +{ + struct address_handler *handler = + container_of(resource, struct address_handler, resource); + + fw_core_remove_address_handler(&handler->handler); + kfree(handler); +} + +static int ioctl_allocate(struct client *client, void *buffer) +{ + struct fw_cdev_allocate *request = buffer; + struct address_handler *handler; + struct fw_address_region region; + + handler = kmalloc(sizeof *handler, GFP_KERNEL); + if (handler == NULL) + return -ENOMEM; + + region.start = request->offset; + region.end = request->offset + request->length; + handler->handler.length = request->length; + handler->handler.address_callback = handle_request; + handler->handler.callback_data = handler; + handler->closure = request->closure; + handler->client = client; + + if (fw_core_add_address_handler(&handler->handler, ®ion) < 0) { + kfree(handler); + return -EBUSY; + } + + handler->resource.release = release_address_handler; + add_client_resource(client, &handler->resource); + request->handle = handler->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, NULL); +} + +static int ioctl_send_response(struct client *client, void *buffer) +{ + struct fw_cdev_send_response *request = buffer; + struct client_resource *resource; + struct request *r; + + if (release_client_resource(client, request->handle, &resource) < 0) + return -EINVAL; + r = container_of(resource, struct request, 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); +} + +struct descriptor { + struct fw_descriptor d; + struct client_resource resource; + u32 data[0]; +}; + +static void release_descriptor(struct client *client, + struct client_resource *resource) +{ + struct descriptor *descriptor = + container_of(resource, struct descriptor, resource); + + fw_core_remove_descriptor(&descriptor->d); + kfree(descriptor); +} + +static int ioctl_add_descriptor(struct client *client, void *buffer) +{ + struct fw_cdev_add_descriptor *request = buffer; + struct descriptor *descriptor; + int retval; + + if (request->length > 256) + return -EINVAL; + + descriptor = + kmalloc(sizeof *descriptor + request->length * 4, GFP_KERNEL); + if (descriptor == NULL) + return -ENOMEM; + + if (copy_from_user(descriptor->data, + u64_to_uptr(request->data), request->length * 4)) { + kfree(descriptor); + return -EFAULT; + } + + descriptor->d.length = request->length; + descriptor->d.immediate = request->immediate; + descriptor->d.key = request->key; + descriptor->d.data = descriptor->data; + + retval = fw_core_add_descriptor(&descriptor->d); + if (retval < 0) { + kfree(descriptor); + return retval; + } + + descriptor->resource.release = release_descriptor; + add_client_resource(client, &descriptor->resource); + request->handle = descriptor->resource.handle; + + return 0; +} + +static int ioctl_remove_descriptor(struct client *client, void *buffer) +{ + struct fw_cdev_remove_descriptor *request = buffer; + + return release_client_resource(client, request->handle, 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 *interrupt; + + interrupt = kzalloc(sizeof *interrupt + header_length, GFP_ATOMIC); + if (interrupt == NULL) + return; + + interrupt->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT; + interrupt->interrupt.closure = client->iso_closure; + interrupt->interrupt.cycle = cycle; + interrupt->interrupt.header_length = header_length; + memcpy(interrupt->interrupt.header, header, header_length); + queue_event(client, &interrupt->event, + &interrupt->interrupt, + sizeof interrupt->interrupt + header_length, NULL, 0); +} + +static int ioctl_create_iso_context(struct client *client, void *buffer) +{ + struct fw_cdev_create_iso_context *request = buffer; + + if (request->channel > 63) + return -EINVAL; + + switch (request->type) { + case FW_ISO_CONTEXT_RECEIVE: + if (request->header_size < 4 || (request->header_size & 3)) + return -EINVAL; + + break; + + case FW_ISO_CONTEXT_TRANSMIT: + if (request->speed > SCODE_3200) + return -EINVAL; + + break; + + default: + return -EINVAL; + } + + client->iso_closure = request->closure; + client->iso_context = fw_iso_context_create(client->device->card, + request->type, + request->channel, + request->speed, + request->header_size, + iso_callback, client); + if (IS_ERR(client->iso_context)) + return PTR_ERR(client->iso_context); + + /* We only support one context at this time. */ + request->handle = 0; + + return 0; +} + +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; + 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; + } + + if (!access_ok(VERIFY_READ, request->packets, request->size)) + return -EFAULT; + + p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets); + end = (void __user *)p + request->size; + count = 0; + while (p < end) { + if (__copy_from_user(&u.packet, p, sizeof *p)) + return -EFAULT; + + if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) { + header_length = u.packet.header_length; + } else { + /* We require that header_length is a multiple of + * the fixed header size, ctx->header_size */ + if (ctx->header_size == 0) { + if (u.packet.header_length > 0) + return -EINVAL; + } else if (u.packet.header_length % ctx->header_size != 0) { + return -EINVAL; + } + header_length = 0; + } + + next = (struct fw_cdev_iso_packet __user *) + &p->header[header_length / 4]; + if (next > end) + return -EINVAL; + if (__copy_from_user + (u.packet.header, p->header, header_length)) + return -EFAULT; + if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT && + u.packet.header_length + u.packet.payload_length > 0) + return -EINVAL; + if (payload + u.packet.payload_length > 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 (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 (request->handle != 0) + return -EINVAL; + + return fw_iso_context_stop(client->iso_context); +} + +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, +}; + +static int +dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg) +{ + char buffer[256]; + int retval; + + 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; + } + + retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer); + if (retval < 0) + return retval; + + if (_IOC_DIR(cmd) & _IOC_READ) { + if (_IOC_SIZE(cmd) > sizeof buffer || + copy_to_user(arg, buffer, _IOC_SIZE(cmd))) + return -EFAULT; + } + + return 0; +} + +static long +fw_device_op_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct client *client = file->private_data; + + return dispatch_ioctl(client, cmd, (void __user *) arg); +} + +#ifdef CONFIG_COMPAT +static long +fw_device_op_compat_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct client *client = file->private_data; + + return dispatch_ioctl(client, cmd, compat_ptr(arg)); +} +#endif + +static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct client *client = file->private_data; + enum dma_data_direction direction; + unsigned long size; + int page_count, retval; + + /* FIXME: We could support multiple buffers, but we don't. */ + if (client->buffer.pages != NULL) + return -EBUSY; + + if (!(vma->vm_flags & VM_SHARED)) + return -EINVAL; + + if (vma->vm_start & ~PAGE_MASK) + return -EINVAL; + + client->vm_start = vma->vm_start; + size = vma->vm_end - vma->vm_start; + page_count = size >> PAGE_SHIFT; + if (size & ~PAGE_MASK) + return -EINVAL; + + if (vma->vm_flags & VM_WRITE) + direction = DMA_TO_DEVICE; + else + direction = DMA_FROM_DEVICE; + + retval = fw_iso_buffer_init(&client->buffer, client->device->card, + page_count, direction); + if (retval < 0) + return retval; + + retval = fw_iso_buffer_map(&client->buffer, vma); + if (retval < 0) + fw_iso_buffer_destroy(&client->buffer, client->device->card); + + return retval; +} + +static int fw_device_op_release(struct inode *inode, struct file *file) +{ + struct client *client = file->private_data; + struct event *e, *next_e; + struct client_resource *r, *next_r; + unsigned long flags; + + if (client->buffer.pages) + fw_iso_buffer_destroy(&client->buffer, client->device->card); + + if (client->iso_context) + fw_iso_context_destroy(client->iso_context); + + list_for_each_entry_safe(r, next_r, &client->resource_list, link) + r->release(client, r); + + /* FIXME: We should wait for the async tasklets to stop + * running before freeing the memory. */ + + list_for_each_entry_safe(e, next_e, &client->event_list, link) + kfree(e); + + spin_lock_irqsave(&client->device->card->lock, flags); + list_del(&client->link); + spin_unlock_irqrestore(&client->device->card->lock, flags); + + fw_device_put(client->device); + kfree(client); + + return 0; +} + +static unsigned int fw_device_op_poll(struct file *file, poll_table * pt) +{ + struct client *client = file->private_data; + unsigned int mask = 0; + + poll_wait(file, &client->wait, pt); + + if (fw_device_is_shutdown(client->device)) + mask |= POLLHUP | POLLERR; + if (!list_empty(&client->event_list)) + mask |= POLLIN | POLLRDNORM; + + return mask; +} + +const struct file_operations fw_device_ops = { + .owner = THIS_MODULE, + .open = fw_device_op_open, + .read = fw_device_op_read, + .unlocked_ioctl = fw_device_op_ioctl, + .poll = fw_device_op_poll, + .release = fw_device_op_release, + .mmap = fw_device_op_mmap, + +#ifdef CONFIG_COMPAT + .compat_ioctl = fw_device_op_compat_ioctl, +#endif +}; -- Stefan Richter -=====-=-=== -=-= ---=- http://arcgraph.de/sr/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/