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1790 lines
45 KiB
1790 lines
45 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Char device for device raw access |
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* |
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* Copyright (C) 2005-2007 Kristian Hoegsberg <[email protected]> |
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*/ |
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|
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#include <linux/bug.h> |
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#include <linux/compat.h> |
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#include <linux/delay.h> |
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#include <linux/device.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/errno.h> |
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#include <linux/firewire.h> |
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#include <linux/firewire-cdev.h> |
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#include <linux/idr.h> |
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#include <linux/irqflags.h> |
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#include <linux/jiffies.h> |
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#include <linux/kernel.h> |
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#include <linux/kref.h> |
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#include <linux/mm.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/poll.h> |
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#include <linux/sched.h> /* required for linux/wait.h */ |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/string.h> |
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#include <linux/time.h> |
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#include <linux/uaccess.h> |
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#include <linux/vmalloc.h> |
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#include <linux/wait.h> |
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#include <linux/workqueue.h> |
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#include "core.h" |
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|
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/* |
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* ABI version history is documented in linux/firewire-cdev.h. |
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*/ |
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#define FW_CDEV_KERNEL_VERSION 5 |
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#define FW_CDEV_VERSION_EVENT_REQUEST2 4 |
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#define FW_CDEV_VERSION_ALLOCATE_REGION_END 4 |
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#define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5 |
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struct client { |
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u32 version; |
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struct fw_device *device; |
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spinlock_t lock; |
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bool in_shutdown; |
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struct idr resource_idr; |
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struct list_head event_list; |
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wait_queue_head_t wait; |
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wait_queue_head_t tx_flush_wait; |
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u64 bus_reset_closure; |
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struct fw_iso_context *iso_context; |
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u64 iso_closure; |
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struct fw_iso_buffer buffer; |
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unsigned long vm_start; |
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bool buffer_is_mapped; |
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struct list_head phy_receiver_link; |
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u64 phy_receiver_closure; |
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struct list_head link; |
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struct kref kref; |
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}; |
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static inline void client_get(struct client *client) |
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{ |
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kref_get(&client->kref); |
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} |
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static void client_release(struct kref *kref) |
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{ |
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struct client *client = container_of(kref, struct client, kref); |
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fw_device_put(client->device); |
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kfree(client); |
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} |
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static void client_put(struct client *client) |
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{ |
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kref_put(&client->kref, client_release); |
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} |
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struct client_resource; |
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typedef void (*client_resource_release_fn_t)(struct client *, |
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struct client_resource *); |
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struct client_resource { |
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client_resource_release_fn_t release; |
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int handle; |
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}; |
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struct address_handler_resource { |
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struct client_resource resource; |
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struct fw_address_handler handler; |
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__u64 closure; |
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struct client *client; |
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}; |
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struct outbound_transaction_resource { |
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struct client_resource resource; |
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struct fw_transaction transaction; |
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}; |
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struct inbound_transaction_resource { |
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struct client_resource resource; |
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struct fw_card *card; |
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struct fw_request *request; |
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void *data; |
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size_t length; |
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}; |
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|
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struct descriptor_resource { |
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struct client_resource resource; |
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struct fw_descriptor descriptor; |
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u32 data[]; |
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}; |
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struct iso_resource { |
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struct client_resource resource; |
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struct client *client; |
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/* Schedule work and access todo only with client->lock held. */ |
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struct delayed_work work; |
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enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC, |
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ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo; |
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int generation; |
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u64 channels; |
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s32 bandwidth; |
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struct iso_resource_event *e_alloc, *e_dealloc; |
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}; |
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static void release_iso_resource(struct client *, struct client_resource *); |
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|
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static void schedule_iso_resource(struct iso_resource *r, unsigned long delay) |
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{ |
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client_get(r->client); |
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if (!queue_delayed_work(fw_workqueue, &r->work, delay)) |
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client_put(r->client); |
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} |
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static void schedule_if_iso_resource(struct client_resource *resource) |
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{ |
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if (resource->release == release_iso_resource) |
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schedule_iso_resource(container_of(resource, |
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struct iso_resource, resource), 0); |
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} |
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/* |
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* dequeue_event() just kfree()'s the event, so the event has to be |
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* the first field in a struct XYZ_event. |
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*/ |
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struct event { |
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struct { void *data; size_t size; } v[2]; |
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struct list_head link; |
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}; |
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struct bus_reset_event { |
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struct event event; |
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struct fw_cdev_event_bus_reset reset; |
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}; |
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struct outbound_transaction_event { |
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struct event event; |
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struct client *client; |
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struct outbound_transaction_resource r; |
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struct fw_cdev_event_response response; |
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}; |
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struct inbound_transaction_event { |
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struct event event; |
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union { |
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struct fw_cdev_event_request request; |
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struct fw_cdev_event_request2 request2; |
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} req; |
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}; |
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struct iso_interrupt_event { |
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struct event event; |
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struct fw_cdev_event_iso_interrupt interrupt; |
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}; |
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struct iso_interrupt_mc_event { |
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struct event event; |
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struct fw_cdev_event_iso_interrupt_mc interrupt; |
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}; |
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struct iso_resource_event { |
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struct event event; |
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struct fw_cdev_event_iso_resource iso_resource; |
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}; |
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struct outbound_phy_packet_event { |
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struct event event; |
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struct client *client; |
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struct fw_packet p; |
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struct fw_cdev_event_phy_packet phy_packet; |
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}; |
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struct inbound_phy_packet_event { |
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struct event event; |
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struct fw_cdev_event_phy_packet phy_packet; |
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}; |
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#ifdef CONFIG_COMPAT |
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static void __user *u64_to_uptr(u64 value) |
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{ |
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if (in_compat_syscall()) |
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return compat_ptr(value); |
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else |
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return (void __user *)(unsigned long)value; |
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} |
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static u64 uptr_to_u64(void __user *ptr) |
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{ |
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if (in_compat_syscall()) |
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return ptr_to_compat(ptr); |
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else |
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return (u64)(unsigned long)ptr; |
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} |
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#else |
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static inline void __user *u64_to_uptr(u64 value) |
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{ |
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return (void __user *)(unsigned long)value; |
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} |
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static inline u64 uptr_to_u64(void __user *ptr) |
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{ |
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return (u64)(unsigned long)ptr; |
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} |
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#endif /* CONFIG_COMPAT */ |
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static int fw_device_op_open(struct inode *inode, struct file *file) |
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{ |
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struct fw_device *device; |
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struct client *client; |
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device = fw_device_get_by_devt(inode->i_rdev); |
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if (device == NULL) |
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return -ENODEV; |
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if (fw_device_is_shutdown(device)) { |
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fw_device_put(device); |
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return -ENODEV; |
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} |
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client = kzalloc(sizeof(*client), GFP_KERNEL); |
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if (client == NULL) { |
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fw_device_put(device); |
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return -ENOMEM; |
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} |
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client->device = device; |
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spin_lock_init(&client->lock); |
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idr_init(&client->resource_idr); |
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INIT_LIST_HEAD(&client->event_list); |
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init_waitqueue_head(&client->wait); |
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init_waitqueue_head(&client->tx_flush_wait); |
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INIT_LIST_HEAD(&client->phy_receiver_link); |
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INIT_LIST_HEAD(&client->link); |
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kref_init(&client->kref); |
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file->private_data = client; |
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return nonseekable_open(inode, file); |
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} |
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static void queue_event(struct client *client, struct event *event, |
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void *data0, size_t size0, void *data1, size_t size1) |
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{ |
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unsigned long flags; |
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event->v[0].data = data0; |
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event->v[0].size = size0; |
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event->v[1].data = data1; |
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event->v[1].size = size1; |
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spin_lock_irqsave(&client->lock, flags); |
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if (client->in_shutdown) |
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kfree(event); |
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else |
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list_add_tail(&event->link, &client->event_list); |
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spin_unlock_irqrestore(&client->lock, flags); |
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wake_up_interruptible(&client->wait); |
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} |
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static int dequeue_event(struct client *client, |
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char __user *buffer, size_t count) |
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{ |
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struct event *event; |
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size_t size, total; |
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int i, ret; |
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ret = wait_event_interruptible(client->wait, |
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!list_empty(&client->event_list) || |
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fw_device_is_shutdown(client->device)); |
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if (ret < 0) |
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return ret; |
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if (list_empty(&client->event_list) && |
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fw_device_is_shutdown(client->device)) |
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return -ENODEV; |
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spin_lock_irq(&client->lock); |
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event = list_first_entry(&client->event_list, struct event, link); |
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list_del(&event->link); |
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spin_unlock_irq(&client->lock); |
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total = 0; |
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for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) { |
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size = min(event->v[i].size, count - total); |
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if (copy_to_user(buffer + total, event->v[i].data, size)) { |
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ret = -EFAULT; |
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goto out; |
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} |
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total += size; |
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} |
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ret = total; |
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out: |
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kfree(event); |
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return ret; |
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} |
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static ssize_t fw_device_op_read(struct file *file, char __user *buffer, |
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size_t count, loff_t *offset) |
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{ |
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struct client *client = file->private_data; |
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return dequeue_event(client, buffer, count); |
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} |
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static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event, |
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struct client *client) |
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{ |
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struct fw_card *card = client->device->card; |
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spin_lock_irq(&card->lock); |
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event->closure = client->bus_reset_closure; |
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event->type = FW_CDEV_EVENT_BUS_RESET; |
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event->generation = client->device->generation; |
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event->node_id = client->device->node_id; |
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event->local_node_id = card->local_node->node_id; |
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event->bm_node_id = card->bm_node_id; |
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event->irm_node_id = card->irm_node->node_id; |
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event->root_node_id = card->root_node->node_id; |
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spin_unlock_irq(&card->lock); |
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} |
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static void for_each_client(struct fw_device *device, |
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void (*callback)(struct client *client)) |
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{ |
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struct client *c; |
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mutex_lock(&device->client_list_mutex); |
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list_for_each_entry(c, &device->client_list, link) |
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callback(c); |
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mutex_unlock(&device->client_list_mutex); |
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} |
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static int schedule_reallocations(int id, void *p, void *data) |
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{ |
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schedule_if_iso_resource(p); |
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return 0; |
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} |
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static void queue_bus_reset_event(struct client *client) |
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{ |
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struct bus_reset_event *e; |
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e = kzalloc(sizeof(*e), GFP_KERNEL); |
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if (e == NULL) |
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return; |
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fill_bus_reset_event(&e->reset, client); |
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queue_event(client, &e->event, |
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&e->reset, sizeof(e->reset), NULL, 0); |
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spin_lock_irq(&client->lock); |
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idr_for_each(&client->resource_idr, schedule_reallocations, client); |
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spin_unlock_irq(&client->lock); |
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} |
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void fw_device_cdev_update(struct fw_device *device) |
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{ |
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for_each_client(device, queue_bus_reset_event); |
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} |
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static void wake_up_client(struct client *client) |
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{ |
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wake_up_interruptible(&client->wait); |
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} |
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void fw_device_cdev_remove(struct fw_device *device) |
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{ |
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for_each_client(device, wake_up_client); |
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} |
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union ioctl_arg { |
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struct fw_cdev_get_info get_info; |
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struct fw_cdev_send_request send_request; |
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struct fw_cdev_allocate allocate; |
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struct fw_cdev_deallocate deallocate; |
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struct fw_cdev_send_response send_response; |
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struct fw_cdev_initiate_bus_reset initiate_bus_reset; |
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struct fw_cdev_add_descriptor add_descriptor; |
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struct fw_cdev_remove_descriptor remove_descriptor; |
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struct fw_cdev_create_iso_context create_iso_context; |
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struct fw_cdev_queue_iso queue_iso; |
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struct fw_cdev_start_iso start_iso; |
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struct fw_cdev_stop_iso stop_iso; |
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struct fw_cdev_get_cycle_timer get_cycle_timer; |
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struct fw_cdev_allocate_iso_resource allocate_iso_resource; |
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struct fw_cdev_send_stream_packet send_stream_packet; |
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struct fw_cdev_get_cycle_timer2 get_cycle_timer2; |
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struct fw_cdev_send_phy_packet send_phy_packet; |
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struct fw_cdev_receive_phy_packets receive_phy_packets; |
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struct fw_cdev_set_iso_channels set_iso_channels; |
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struct fw_cdev_flush_iso flush_iso; |
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}; |
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|
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static int ioctl_get_info(struct client *client, union ioctl_arg *arg) |
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{ |
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struct fw_cdev_get_info *a = &arg->get_info; |
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struct fw_cdev_event_bus_reset bus_reset; |
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unsigned long ret = 0; |
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|
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client->version = a->version; |
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a->version = FW_CDEV_KERNEL_VERSION; |
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a->card = client->device->card->index; |
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|
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down_read(&fw_device_rwsem); |
|
|
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if (a->rom != 0) { |
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size_t want = a->rom_length; |
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size_t have = client->device->config_rom_length * 4; |
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|
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ret = copy_to_user(u64_to_uptr(a->rom), |
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client->device->config_rom, min(want, have)); |
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} |
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a->rom_length = client->device->config_rom_length * 4; |
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|
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up_read(&fw_device_rwsem); |
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|
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if (ret != 0) |
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return -EFAULT; |
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|
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mutex_lock(&client->device->client_list_mutex); |
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|
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client->bus_reset_closure = a->bus_reset_closure; |
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if (a->bus_reset != 0) { |
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fill_bus_reset_event(&bus_reset, client); |
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/* unaligned size of bus_reset is 36 bytes */ |
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ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36); |
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} |
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if (ret == 0 && list_empty(&client->link)) |
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list_add_tail(&client->link, &client->device->client_list); |
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|
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mutex_unlock(&client->device->client_list_mutex); |
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|
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return ret ? -EFAULT : 0; |
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} |
|
|
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static int add_client_resource(struct client *client, |
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struct client_resource *resource, gfp_t gfp_mask) |
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{ |
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bool preload = gfpflags_allow_blocking(gfp_mask); |
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unsigned long flags; |
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int ret; |
|
|
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if (preload) |
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idr_preload(gfp_mask); |
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spin_lock_irqsave(&client->lock, flags); |
|
|
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if (client->in_shutdown) |
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ret = -ECANCELED; |
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else |
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ret = idr_alloc(&client->resource_idr, resource, 0, 0, |
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GFP_NOWAIT); |
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if (ret >= 0) { |
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resource->handle = ret; |
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client_get(client); |
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schedule_if_iso_resource(resource); |
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} |
|
|
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spin_unlock_irqrestore(&client->lock, flags); |
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if (preload) |
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idr_preload_end(); |
|
|
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return ret < 0 ? ret : 0; |
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} |
|
|
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static int release_client_resource(struct client *client, u32 handle, |
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client_resource_release_fn_t release, |
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struct client_resource **return_resource) |
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{ |
|
struct client_resource *resource; |
|
|
|
spin_lock_irq(&client->lock); |
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if (client->in_shutdown) |
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resource = NULL; |
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else |
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resource = idr_find(&client->resource_idr, handle); |
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if (resource && resource->release == release) |
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idr_remove(&client->resource_idr, handle); |
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spin_unlock_irq(&client->lock); |
|
|
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if (!(resource && resource->release == release)) |
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return -EINVAL; |
|
|
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if (return_resource) |
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*return_resource = resource; |
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else |
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resource->release(client, resource); |
|
|
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client_put(client); |
|
|
|
return 0; |
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} |
|
|
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static void release_transaction(struct client *client, |
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struct client_resource *resource) |
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{ |
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} |
|
|
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static void complete_transaction(struct fw_card *card, int rcode, |
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void *payload, size_t length, void *data) |
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{ |
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struct outbound_transaction_event *e = data; |
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struct fw_cdev_event_response *rsp = &e->response; |
|
struct client *client = e->client; |
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unsigned long flags; |
|
|
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if (length < rsp->length) |
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rsp->length = length; |
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if (rcode == RCODE_COMPLETE) |
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memcpy(rsp->data, payload, rsp->length); |
|
|
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spin_lock_irqsave(&client->lock, flags); |
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idr_remove(&client->resource_idr, e->r.resource.handle); |
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if (client->in_shutdown) |
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wake_up(&client->tx_flush_wait); |
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spin_unlock_irqrestore(&client->lock, flags); |
|
|
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rsp->type = FW_CDEV_EVENT_RESPONSE; |
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rsp->rcode = rcode; |
|
|
|
/* |
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* In the case that sizeof(*rsp) doesn't align with the position of the |
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* data, and the read is short, preserve an extra copy of the data |
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* 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. |
|
*/ |
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if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data)) |
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queue_event(client, &e->event, rsp, sizeof(*rsp), |
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rsp->data, rsp->length); |
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else |
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queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length, |
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NULL, 0); |
|
|
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/* Drop the idr's reference */ |
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client_put(client); |
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} |
|
|
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static int init_request(struct client *client, |
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struct fw_cdev_send_request *request, |
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int destination_id, int speed) |
|
{ |
|
struct outbound_transaction_event *e; |
|
int ret; |
|
|
|
if (request->tcode != TCODE_STREAM_DATA && |
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(request->length > 4096 || request->length > 512 << speed)) |
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return -EIO; |
|
|
|
if (request->tcode == TCODE_WRITE_QUADLET_REQUEST && |
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request->length < 4) |
|
return -EINVAL; |
|
|
|
e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL); |
|
if (e == NULL) |
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return -ENOMEM; |
|
|
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e->client = client; |
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e->response.length = request->length; |
|
e->response.closure = request->closure; |
|
|
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if (request->data && |
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copy_from_user(e->response.data, |
|
u64_to_uptr(request->data), request->length)) { |
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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); |
|
|
|
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 timespec64 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: ktime_get_real_ts64(&ts); break; |
|
case CLOCK_MONOTONIC: ktime_get_ts64(&ts); break; |
|
case CLOCK_MONOTONIC_RAW: ktime_get_raw_ts64(&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_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); |
|
} |
|
|
|
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 = vm_map_pages_zero(vma, client->buffer.pages, |
|
client->buffer.page_count); |
|
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 __poll_t fw_device_op_poll(struct file *file, poll_table * pt) |
|
{ |
|
struct client *client = file->private_data; |
|
__poll_t mask = 0; |
|
|
|
poll_wait(file, &client->wait, pt); |
|
|
|
if (fw_device_is_shutdown(client->device)) |
|
mask |= EPOLLHUP | EPOLLERR; |
|
if (!list_empty(&client->event_list)) |
|
mask |= EPOLLIN | EPOLLRDNORM; |
|
|
|
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, |
|
.compat_ioctl = compat_ptr_ioctl, |
|
};
|
|
|