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-rw-r--r--drivers/firewire/core-cdev.c1794
1 files changed, 1794 insertions, 0 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
new file mode 100644
index 000000000..16ea847ad
--- /dev/null
+++ b/drivers/firewire/core-cdev.c
@@ -0,0 +1,1794 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Char device for device raw access
+ *
+ * Copyright (C) 2005-2007 Kristian Hoegsberg <krh@bitplanet.net>
+ */
+
+#include <linux/bug.h>
+#include <linux/compat.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/errno.h>
+#include <linux/firewire.h>
+#include <linux/firewire-cdev.h>
+#include <linux/idr.h>
+#include <linux/irqflags.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/poll.h>
+#include <linux/sched.h> /* required for linux/wait.h */
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/time.h>
+#include <linux/uaccess.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+
+#include "core.h"
+
+/*
+ * ABI version history is documented in linux/firewire-cdev.h.
+ */
+#define FW_CDEV_KERNEL_VERSION 5
+#define FW_CDEV_VERSION_EVENT_REQUEST2 4
+#define FW_CDEV_VERSION_ALLOCATE_REGION_END 4
+#define FW_CDEV_VERSION_AUTO_FLUSH_ISO_OVERFLOW 5
+
+struct client {
+ u32 version;
+ struct fw_device *device;
+
+ spinlock_t lock;
+ bool in_shutdown;
+ struct idr resource_idr;
+ struct list_head event_list;
+ wait_queue_head_t wait;
+ wait_queue_head_t tx_flush_wait;
+ u64 bus_reset_closure;
+
+ struct fw_iso_context *iso_context;
+ u64 iso_closure;
+ struct fw_iso_buffer buffer;
+ unsigned long vm_start;
+ bool buffer_is_mapped;
+
+ struct list_head phy_receiver_link;
+ u64 phy_receiver_closure;
+
+ struct list_head link;
+ struct kref kref;
+};
+
+static inline void client_get(struct client *client)
+{
+ kref_get(&client->kref);
+}
+
+static void client_release(struct kref *kref)
+{
+ struct client *client = container_of(kref, struct client, kref);
+
+ fw_device_put(client->device);
+ kfree(client);
+}
+
+static void client_put(struct client *client)
+{
+ kref_put(&client->kref, client_release);
+}
+
+struct client_resource;
+typedef void (*client_resource_release_fn_t)(struct client *,
+ struct client_resource *);
+struct client_resource {
+ client_resource_release_fn_t release;
+ int handle;
+};
+
+struct address_handler_resource {
+ struct client_resource resource;
+ struct fw_address_handler handler;
+ __u64 closure;
+ struct client *client;
+};
+
+struct outbound_transaction_resource {
+ struct client_resource resource;
+ struct fw_transaction transaction;
+};
+
+struct inbound_transaction_resource {
+ struct client_resource resource;
+ struct fw_card *card;
+ struct fw_request *request;
+ void *data;
+ size_t length;
+};
+
+struct descriptor_resource {
+ struct client_resource resource;
+ struct fw_descriptor descriptor;
+ u32 data[];
+};
+
+struct iso_resource {
+ struct client_resource resource;
+ struct client *client;
+ /* Schedule work and access todo only with client->lock held. */
+ struct delayed_work work;
+ enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
+ ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
+ int generation;
+ u64 channels;
+ s32 bandwidth;
+ struct iso_resource_event *e_alloc, *e_dealloc;
+};
+
+static void release_iso_resource(struct client *, struct client_resource *);
+
+static void schedule_iso_resource(struct iso_resource *r, unsigned long delay)
+{
+ client_get(r->client);
+ if (!queue_delayed_work(fw_workqueue, &r->work, delay))
+ client_put(r->client);
+}
+
+static void schedule_if_iso_resource(struct client_resource *resource)
+{
+ if (resource->release == release_iso_resource)
+ schedule_iso_resource(container_of(resource,
+ struct iso_resource, resource), 0);
+}
+
+/*
+ * dequeue_event() just kfree()'s the event, so the event has to be
+ * the first field in a struct XYZ_event.
+ */
+struct event {
+ struct { void *data; size_t size; } v[2];
+ struct list_head link;
+};
+
+struct bus_reset_event {
+ struct event event;
+ struct fw_cdev_event_bus_reset reset;
+};
+
+struct outbound_transaction_event {
+ struct event event;
+ struct client *client;
+ struct outbound_transaction_resource r;
+ struct fw_cdev_event_response response;
+};
+
+struct inbound_transaction_event {
+ struct event event;
+ union {
+ struct fw_cdev_event_request request;
+ struct fw_cdev_event_request2 request2;
+ } req;
+};
+
+struct iso_interrupt_event {
+ struct event event;
+ struct fw_cdev_event_iso_interrupt interrupt;
+};
+
+struct iso_interrupt_mc_event {
+ struct event event;
+ struct fw_cdev_event_iso_interrupt_mc interrupt;
+};
+
+struct iso_resource_event {
+ struct event event;
+ struct fw_cdev_event_iso_resource iso_resource;
+};
+
+struct outbound_phy_packet_event {
+ struct event event;
+ struct client *client;
+ struct fw_packet p;
+ struct fw_cdev_event_phy_packet phy_packet;
+};
+
+struct inbound_phy_packet_event {
+ struct event event;
+ struct fw_cdev_event_phy_packet phy_packet;
+};
+
+#ifdef CONFIG_COMPAT
+static void __user *u64_to_uptr(u64 value)
+{
+ if (in_compat_syscall())
+ return compat_ptr(value);
+ else
+ return (void __user *)(unsigned long)value;
+}
+
+static u64 uptr_to_u64(void __user *ptr)
+{
+ if (in_compat_syscall())
+ return ptr_to_compat(ptr);
+ else
+ return (u64)(unsigned long)ptr;
+}
+#else
+static inline void __user *u64_to_uptr(u64 value)
+{
+ return (void __user *)(unsigned long)value;
+}
+
+static inline u64 uptr_to_u64(void __user *ptr)
+{
+ return (u64)(unsigned long)ptr;
+}
+#endif /* CONFIG_COMPAT */
+
+static int fw_device_op_open(struct inode *inode, struct file *file)
+{
+ struct fw_device *device;
+ struct client *client;
+
+ device = fw_device_get_by_devt(inode->i_rdev);
+ if (device == NULL)
+ return -ENODEV;
+
+ if (fw_device_is_shutdown(device)) {
+ fw_device_put(device);
+ return -ENODEV;
+ }
+
+ client = kzalloc(sizeof(*client), GFP_KERNEL);
+ if (client == NULL) {
+ fw_device_put(device);
+ return -ENOMEM;
+ }
+
+ client->device = device;
+ spin_lock_init(&client->lock);
+ idr_init(&client->resource_idr);
+ INIT_LIST_HEAD(&client->event_list);
+ init_waitqueue_head(&client->wait);
+ init_waitqueue_head(&client->tx_flush_wait);
+ INIT_LIST_HEAD(&client->phy_receiver_link);
+ INIT_LIST_HEAD(&client->link);
+ kref_init(&client->kref);
+
+ file->private_data = client;
+
+ return nonseekable_open(inode, file);
+}
+
+static void queue_event(struct client *client, struct event *event,
+ void *data0, size_t size0, void *data1, size_t size1)
+{
+ unsigned long flags;
+
+ event->v[0].data = data0;
+ event->v[0].size = size0;
+ event->v[1].data = data1;
+ event->v[1].size = size1;
+
+ spin_lock_irqsave(&client->lock, flags);
+ if (client->in_shutdown)
+ kfree(event);
+ else
+ list_add_tail(&event->link, &client->event_list);
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ wake_up_interruptible(&client->wait);
+}
+
+static int dequeue_event(struct client *client,
+ char __user *buffer, size_t count)
+{
+ struct event *event;
+ size_t size, total;
+ int i, ret;
+
+ ret = wait_event_interruptible(client->wait,
+ !list_empty(&client->event_list) ||
+ fw_device_is_shutdown(client->device));
+ if (ret < 0)
+ return ret;
+
+ if (list_empty(&client->event_list) &&
+ fw_device_is_shutdown(client->device))
+ return -ENODEV;
+
+ spin_lock_irq(&client->lock);
+ event = list_first_entry(&client->event_list, struct event, link);
+ list_del(&event->link);
+ spin_unlock_irq(&client->lock);
+
+ total = 0;
+ for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
+ size = min(event->v[i].size, count - total);
+ if (copy_to_user(buffer + total, event->v[i].data, size)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ total += size;
+ }
+ ret = total;
+
+ out:
+ kfree(event);
+
+ return ret;
+}
+
+static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
+ size_t count, loff_t *offset)
+{
+ struct client *client = file->private_data;
+
+ return dequeue_event(client, buffer, count);
+}
+
+static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
+ struct client *client)
+{
+ struct fw_card *card = client->device->card;
+
+ spin_lock_irq(&card->lock);
+
+ event->closure = client->bus_reset_closure;
+ event->type = FW_CDEV_EVENT_BUS_RESET;
+ event->generation = client->device->generation;
+ event->node_id = client->device->node_id;
+ event->local_node_id = card->local_node->node_id;
+ event->bm_node_id = card->bm_node_id;
+ event->irm_node_id = card->irm_node->node_id;
+ event->root_node_id = card->root_node->node_id;
+
+ spin_unlock_irq(&card->lock);
+}
+
+static void for_each_client(struct fw_device *device,
+ void (*callback)(struct client *client))
+{
+ struct client *c;
+
+ mutex_lock(&device->client_list_mutex);
+ list_for_each_entry(c, &device->client_list, link)
+ callback(c);
+ mutex_unlock(&device->client_list_mutex);
+}
+
+static int schedule_reallocations(int id, void *p, void *data)
+{
+ schedule_if_iso_resource(p);
+
+ return 0;
+}
+
+static void queue_bus_reset_event(struct client *client)
+{
+ struct bus_reset_event *e;
+
+ e = kzalloc(sizeof(*e), GFP_KERNEL);
+ if (e == NULL)
+ return;
+
+ fill_bus_reset_event(&e->reset, client);
+
+ queue_event(client, &e->event,
+ &e->reset, sizeof(e->reset), NULL, 0);
+
+ spin_lock_irq(&client->lock);
+ idr_for_each(&client->resource_idr, schedule_reallocations, client);
+ spin_unlock_irq(&client->lock);
+}
+
+void fw_device_cdev_update(struct fw_device *device)
+{
+ for_each_client(device, queue_bus_reset_event);
+}
+
+static void wake_up_client(struct client *client)
+{
+ wake_up_interruptible(&client->wait);
+}
+
+void fw_device_cdev_remove(struct fw_device *device)
+{
+ for_each_client(device, wake_up_client);
+}
+
+union ioctl_arg {
+ struct fw_cdev_get_info get_info;
+ struct fw_cdev_send_request send_request;
+ struct fw_cdev_allocate allocate;
+ struct fw_cdev_deallocate deallocate;
+ struct fw_cdev_send_response send_response;
+ struct fw_cdev_initiate_bus_reset initiate_bus_reset;
+ struct fw_cdev_add_descriptor add_descriptor;
+ struct fw_cdev_remove_descriptor remove_descriptor;
+ struct fw_cdev_create_iso_context create_iso_context;
+ struct fw_cdev_queue_iso queue_iso;
+ struct fw_cdev_start_iso start_iso;
+ struct fw_cdev_stop_iso stop_iso;
+ struct fw_cdev_get_cycle_timer get_cycle_timer;
+ struct fw_cdev_allocate_iso_resource allocate_iso_resource;
+ struct fw_cdev_send_stream_packet send_stream_packet;
+ struct fw_cdev_get_cycle_timer2 get_cycle_timer2;
+ struct fw_cdev_send_phy_packet send_phy_packet;
+ struct fw_cdev_receive_phy_packets receive_phy_packets;
+ struct fw_cdev_set_iso_channels set_iso_channels;
+ struct fw_cdev_flush_iso flush_iso;
+};
+
+static int ioctl_get_info(struct client *client, union ioctl_arg *arg)
+{
+ struct fw_cdev_get_info *a = &arg->get_info;
+ struct fw_cdev_event_bus_reset bus_reset;
+ unsigned long ret = 0;
+
+ client->version = a->version;
+ a->version = FW_CDEV_KERNEL_VERSION;
+ a->card = client->device->card->index;
+
+ down_read(&fw_device_rwsem);
+
+ if (a->rom != 0) {
+ size_t want = a->rom_length;
+ size_t have = client->device->config_rom_length * 4;
+
+ ret = copy_to_user(u64_to_uptr(a->rom),
+ client->device->config_rom, min(want, have));
+ }
+ a->rom_length = client->device->config_rom_length * 4;
+
+ up_read(&fw_device_rwsem);
+
+ if (ret != 0)
+ return -EFAULT;
+
+ mutex_lock(&client->device->client_list_mutex);
+
+ client->bus_reset_closure = a->bus_reset_closure;
+ if (a->bus_reset != 0) {
+ fill_bus_reset_event(&bus_reset, client);
+ /* unaligned size of bus_reset is 36 bytes */
+ ret = copy_to_user(u64_to_uptr(a->bus_reset), &bus_reset, 36);
+ }
+ if (ret == 0 && list_empty(&client->link))
+ list_add_tail(&client->link, &client->device->client_list);
+
+ mutex_unlock(&client->device->client_list_mutex);
+
+ return ret ? -EFAULT : 0;
+}
+
+static int add_client_resource(struct client *client,
+ struct client_resource *resource, gfp_t gfp_mask)
+{
+ bool preload = gfpflags_allow_blocking(gfp_mask);
+ unsigned long flags;
+ int ret;
+
+ if (preload)
+ idr_preload(gfp_mask);
+ spin_lock_irqsave(&client->lock, flags);
+
+ if (client->in_shutdown)
+ ret = -ECANCELED;
+ else
+ ret = idr_alloc(&client->resource_idr, resource, 0, 0,
+ GFP_NOWAIT);
+ if (ret >= 0) {
+ resource->handle = ret;
+ client_get(client);
+ schedule_if_iso_resource(resource);
+ }
+
+ spin_unlock_irqrestore(&client->lock, flags);
+ if (preload)
+ idr_preload_end();
+
+ return ret < 0 ? ret : 0;
+}
+
+static int release_client_resource(struct client *client, u32 handle,
+ client_resource_release_fn_t release,
+ struct client_resource **return_resource)
+{
+ struct client_resource *resource;
+
+ spin_lock_irq(&client->lock);
+ if (client->in_shutdown)
+ resource = NULL;
+ else
+ resource = idr_find(&client->resource_idr, handle);
+ if (resource && resource->release == release)
+ idr_remove(&client->resource_idr, handle);
+ spin_unlock_irq(&client->lock);
+
+ if (!(resource && resource->release == release))
+ return -EINVAL;
+
+ if (return_resource)
+ *return_resource = resource;
+ else
+ resource->release(client, resource);
+
+ client_put(client);
+
+ return 0;
+}
+
+static void release_transaction(struct client *client,
+ struct client_resource *resource)
+{
+}
+
+static void complete_transaction(struct fw_card *card, int rcode,
+ void *payload, size_t length, void *data)
+{
+ struct outbound_transaction_event *e = data;
+ struct fw_cdev_event_response *rsp = &e->response;
+ struct client *client = e->client;
+ unsigned long flags;
+
+ if (length < rsp->length)
+ rsp->length = length;
+ if (rcode == RCODE_COMPLETE)
+ memcpy(rsp->data, payload, rsp->length);
+
+ spin_lock_irqsave(&client->lock, flags);
+ idr_remove(&client->resource_idr, e->r.resource.handle);
+ if (client->in_shutdown)
+ wake_up(&client->tx_flush_wait);
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ rsp->type = FW_CDEV_EVENT_RESPONSE;
+ rsp->rcode = rcode;
+
+ /*
+ * In the case that sizeof(*rsp) doesn't align with the position of the
+ * data, and the read is short, preserve an extra copy of the data
+ * to stay compatible with a pre-2.6.27 bug. Since the bug is harmless
+ * for short reads and some apps depended on it, this is both safe
+ * and prudent for compatibility.
+ */
+ if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
+ queue_event(client, &e->event, rsp, sizeof(*rsp),
+ rsp->data, rsp->length);
+ else
+ queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
+ NULL, 0);
+
+ /* Drop the idr's reference */
+ client_put(client);
+}
+
+static int init_request(struct client *client,
+ struct fw_cdev_send_request *request,
+ int destination_id, int speed)
+{
+ struct outbound_transaction_event *e;
+ int ret;
+
+ if (request->tcode != TCODE_STREAM_DATA &&
+ (request->length > 4096 || request->length > 512 << speed))
+ return -EIO;
+
+ if (request->tcode == TCODE_WRITE_QUADLET_REQUEST &&
+ request->length < 4)
+ return -EINVAL;
+
+ e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
+ if (e == NULL)
+ return -ENOMEM;
+
+ e->client = client;
+ e->response.length = request->length;
+ e->response.closure = request->closure;
+
+ if (request->data &&
+ copy_from_user(e->response.data,
+ u64_to_uptr(request->data), request->length)) {
+ ret = -EFAULT;
+ goto failed;
+ }
+
+ e->r.resource.release = release_transaction;
+ ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
+ if (ret < 0)
+ goto failed;
+
+ fw_send_request(client->device->card, &e->r.transaction,
+ request->tcode, destination_id, request->generation,
+ speed, request->offset, e->response.data,
+ request->length, complete_transaction, e);
+ return 0;
+
+ failed:
+ kfree(e);
+
+ return ret;
+}
+
+static int ioctl_send_request(struct client *client, union ioctl_arg *arg)
+{
+ switch (arg->send_request.tcode) {
+ case TCODE_WRITE_QUADLET_REQUEST:
+ case TCODE_WRITE_BLOCK_REQUEST:
+ case TCODE_READ_QUADLET_REQUEST:
+ case TCODE_READ_BLOCK_REQUEST:
+ case TCODE_LOCK_MASK_SWAP:
+ case TCODE_LOCK_COMPARE_SWAP:
+ case TCODE_LOCK_FETCH_ADD:
+ case TCODE_LOCK_LITTLE_ADD:
+ case TCODE_LOCK_BOUNDED_ADD:
+ case TCODE_LOCK_WRAP_ADD:
+ case TCODE_LOCK_VENDOR_DEPENDENT:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return init_request(client, &arg->send_request, client->device->node_id,
+ client->device->max_speed);
+}
+
+static inline bool is_fcp_request(struct fw_request *request)
+{
+ return request == NULL;
+}
+
+static void release_request(struct client *client,
+ struct client_resource *resource)
+{
+ struct inbound_transaction_resource *r = container_of(resource,
+ struct inbound_transaction_resource, resource);
+
+ if (is_fcp_request(r->request))
+ kfree(r->data);
+ else
+ fw_send_response(r->card, r->request, RCODE_CONFLICT_ERROR);
+
+ fw_card_put(r->card);
+ kfree(r);
+}
+
+static void handle_request(struct fw_card *card, struct fw_request *request,
+ int tcode, int destination, int source,
+ int generation, unsigned long long offset,
+ void *payload, size_t length, void *callback_data)
+{
+ struct address_handler_resource *handler = callback_data;
+ struct inbound_transaction_resource *r;
+ struct inbound_transaction_event *e;
+ size_t event_size0;
+ void *fcp_frame = NULL;
+ int ret;
+
+ /* card may be different from handler->client->device->card */
+ fw_card_get(card);
+
+ r = kmalloc(sizeof(*r), GFP_ATOMIC);
+ e = kmalloc(sizeof(*e), GFP_ATOMIC);
+ if (r == NULL || e == NULL)
+ goto failed;
+
+ r->card = card;
+ r->request = request;
+ r->data = payload;
+ r->length = length;
+
+ if (is_fcp_request(request)) {
+ /*
+ * FIXME: Let core-transaction.c manage a
+ * single reference-counted copy?
+ */
+ fcp_frame = kmemdup(payload, length, GFP_ATOMIC);
+ if (fcp_frame == NULL)
+ goto failed;
+
+ r->data = fcp_frame;
+ }
+
+ r->resource.release = release_request;
+ ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
+ if (ret < 0)
+ goto failed;
+
+ if (handler->client->version < FW_CDEV_VERSION_EVENT_REQUEST2) {
+ struct fw_cdev_event_request *req = &e->req.request;
+
+ if (tcode & 0x10)
+ tcode = TCODE_LOCK_REQUEST;
+
+ req->type = FW_CDEV_EVENT_REQUEST;
+ req->tcode = tcode;
+ req->offset = offset;
+ req->length = length;
+ req->handle = r->resource.handle;
+ req->closure = handler->closure;
+ event_size0 = sizeof(*req);
+ } else {
+ struct fw_cdev_event_request2 *req = &e->req.request2;
+
+ req->type = FW_CDEV_EVENT_REQUEST2;
+ req->tcode = tcode;
+ req->offset = offset;
+ req->source_node_id = source;
+ req->destination_node_id = destination;
+ req->card = card->index;
+ req->generation = generation;
+ req->length = length;
+ req->handle = r->resource.handle;
+ req->closure = handler->closure;
+ event_size0 = sizeof(*req);
+ }
+
+ queue_event(handler->client, &e->event,
+ &e->req, event_size0, r->data, length);
+ return;
+
+ failed:
+ kfree(r);
+ kfree(e);
+ kfree(fcp_frame);
+
+ if (!is_fcp_request(request))
+ fw_send_response(card, request, RCODE_CONFLICT_ERROR);
+
+ fw_card_put(card);
+}
+
+static void release_address_handler(struct client *client,
+ struct client_resource *resource)
+{
+ struct address_handler_resource *r =
+ container_of(resource, struct address_handler_resource, resource);
+
+ fw_core_remove_address_handler(&r->handler);
+ kfree(r);
+}
+
+static int ioctl_allocate(struct client *client, union ioctl_arg *arg)
+{
+ struct fw_cdev_allocate *a = &arg->allocate;
+ struct address_handler_resource *r;
+ struct fw_address_region region;
+ int ret;
+
+ r = kmalloc(sizeof(*r), GFP_KERNEL);
+ if (r == NULL)
+ return -ENOMEM;
+
+ region.start = a->offset;
+ if (client->version < FW_CDEV_VERSION_ALLOCATE_REGION_END)
+ region.end = a->offset + a->length;
+ else
+ region.end = a->region_end;
+
+ r->handler.length = a->length;
+ r->handler.address_callback = handle_request;
+ r->handler.callback_data = r;
+ r->closure = a->closure;
+ r->client = client;
+
+ ret = fw_core_add_address_handler(&r->handler, &region);
+ 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)) {
+ kfree(r->data);
+ 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);
+ struct client *e_client;
+
+ 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;
+
+ e_client = e->client;
+ 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,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-20 06:01:37 +0000