firewire: Add a bus reset event type for fw-device-cdev.

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

4 files changed, 75 insertions, 3 deletions

diff --git a/drivers/firewire/fw-device-cdev.c b/drivers/firewire/fw-device-cdev.c
index 33fe5768a078..9f3c96c7af29 100644
--- a/drivers/firewire/fw-device-cdev.c
+++ b/drivers/firewire/fw-device-cdev.c
@@ -50,6 +50,11 @@ struct event {
         struct list_head link;
 };
 
+struct bus_reset {
+        struct event event;
+        struct fw_cdev_event_bus_reset reset;
+};
+
 struct response {
         struct event event;
         struct fw_transaction transaction;
@@ -75,6 +80,8 @@ struct client {
         struct fw_iso_context *iso_context;
         struct fw_iso_buffer buffer;
         unsigned long vm_start;
+
+        struct list_head link;
 };
 
 static inline void __user *
@@ -93,6 +100,7 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
 {
         struct fw_device *device;
         struct client *client;
+        unsigned long flags;
 
         device = container_of(inode->i_cdev, struct fw_device, cdev);
 
@@ -110,6 +118,10 @@ static int fw_device_op_open(struct inode *inode, struct file *file)
 
         file->private_data = client;
 
+        spin_lock_irqsave(&device->card->lock, flags);
+        list_add_tail(&client->link, &device->client_list);
+        spin_unlock_irqrestore(&device->card->lock, flags);
+
         return 0;
 }
 
@@ -177,6 +189,45 @@ fw_device_op_read(struct file *file,
         return dequeue_event(client, buffer, count);
 }
 
+static void
+queue_bus_reset_event(struct client *client)
+{
+        struct bus_reset *bus_reset;
+        struct fw_device *device = client->device;
+        struct fw_card *card = device->card;
+
+        bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC);
+        if (bus_reset == NULL) {
+                fw_notify("Out of memory when allocating bus reset event\n");
+                return;
+        }
+
+        bus_reset->reset.type          = FW_CDEV_EVENT_BUS_RESET;
+        bus_reset->reset.node_id       = device->node_id;
+        bus_reset->reset.local_node_id = card->local_node->node_id;
+        bus_reset->reset.bm_node_id    = 0; /* FIXME: We don't track the BM. */
+        bus_reset->reset.irm_node_id   = card->irm_node->node_id;
+        bus_reset->reset.root_node_id  = card->root_node->node_id;
+        bus_reset->reset.generation    = card->generation;
+
+        queue_event(client, &bus_reset->event,
+                    &bus_reset->reset, sizeof bus_reset->reset, NULL, 0);
+}
+
+void fw_device_cdev_update(struct fw_device *device)
+{
+        struct fw_card *card = device->card;
+        struct client *c;
+        unsigned long flags;
+
+        spin_lock_irqsave(&card->lock, flags);
+
+        list_for_each_entry(c, &device->client_list, link)
+                queue_bus_reset_event(c);
+
+        spin_unlock_irqrestore(&card->lock, flags);
+}
+
 static int ioctl_config_rom(struct client *client, void __user *arg)
 {
         struct fw_cdev_get_config_rom rom;
@@ -633,6 +684,7 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
         struct client *client = file->private_data;
         struct address_handler *h, *next;
         struct request *r, *next_r;
+        unsigned long flags;
 
         if (client->buffer.pages)
                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
@@ -657,6 +709,10 @@ static int fw_device_op_release(struct inode *inode, struct file *file)
         while (!list_empty(&client->event_list))
                 dequeue_event(client, NULL, 0);
 
+        spin_lock_irqsave(&client->device->card->lock, flags);
+        list_del(&client->link);
+        spin_unlock_irqrestore(&client->device->card->lock, flags);
+
         fw_device_put(client->device);
         kfree(client);
 
diff --git a/drivers/firewire/fw-device-cdev.h b/drivers/firewire/fw-device-cdev.h
index 739f54fe08cf..4f94471b8078 100644
--- a/drivers/firewire/fw-device-cdev.h
+++ b/drivers/firewire/fw-device-cdev.h
@@ -58,15 +58,26 @@
 #define SCODE_1600                      0x4
 #define SCODE_3200                      0x5
 
-#define FW_CDEV_EVENT_RESPONSE          0x00
-#define FW_CDEV_EVENT_REQUEST           0x01
-#define FW_CDEV_EVENT_ISO_INTERRUPT     0x02
+#define FW_CDEV_EVENT_BUS_RESET         0x00
+#define FW_CDEV_EVENT_RESPONSE          0x01
+#define FW_CDEV_EVENT_REQUEST           0x02
+#define FW_CDEV_EVENT_ISO_INTERRUPT     0x03
 
 /* The 'closure' fields are for user space to use.  Data passed in the
  * 'closure' field for a request will be returned in the corresponding
  * event.  It's a 64-bit type so that it's a fixed size type big
  * enough to hold a pointer on all platforms. */
 
+struct fw_cdev_event_bus_reset {
+        __u32 type;
+        __u32 node_id;
+        __u32 local_node_id;
+        __u32 bm_node_id;
+        __u32 irm_node_id;
+        __u32 root_node_id;
+        __u32 generation;
+};
+
 struct fw_cdev_event_response {
         __u32 type;
         __u32 rcode;
diff --git a/drivers/firewire/fw-device.c b/drivers/firewire/fw-device.c
index 5599265da4a6..ccc05e511a4f 100644
--- a/drivers/firewire/fw-device.c
+++ b/drivers/firewire/fw-device.c
@@ -535,6 +535,7 @@ static void fw_device_update(struct work_struct *work)
         struct fw_device *device =
                 container_of(work, struct fw_device, work.work);
 
+        fw_device_cdev_update(device);
         device_for_each_child(&device->device, NULL, update_unit);
 }
 
@@ -564,6 +565,7 @@ void fw_node_event(struct fw_card *card, struct fw_node *node, int event)
                 device->node = fw_node_get(node);
                 device->node_id = node->node_id;
                 device->generation = card->generation;
+                INIT_LIST_HEAD(&device->client_list);
 
                 /* Set the node data to point back to this device so
                  * FW_NODE_UPDATED callbacks can update the node_id
diff --git a/drivers/firewire/fw-device.h b/drivers/firewire/fw-device.h
index 402a785ceedb..4f731c2b121c 100644
--- a/drivers/firewire/fw-device.h
+++ b/drivers/firewire/fw-device.h
@@ -40,6 +40,7 @@ struct fw_device {
         struct fw_card *card;
         struct device device;
         struct cdev cdev;
+        struct list_head client_list;
         __be32 *config_rom;
         size_t config_rom_length;
         int config_rom_retries;
@@ -56,6 +57,8 @@ struct fw_device *fw_device_get(struct fw_device *device);
 void fw_device_put(struct fw_device *device);
 int fw_device_enable_phys_dma(struct fw_device *device);
 
+void fw_device_cdev_update(struct fw_device *device);
+
 struct fw_unit {
         struct device device;
         u32 *directory;