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path: root/0001-kdbus-interprocess-message-router.patch
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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-23 12:35:28 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-01-23 12:35:28 -0800
commit47b04058716a72333e10917b80ee44e973af2b40 (patch)
treee3831709bf2a3b0c6d8be8b27699513a41cc486c /0001-kdbus-interprocess-message-router.patch
parenteddf26515f8563a8ed7302a487465bfd0cf8eccd (diff)
downloadpatches-47b04058716a72333e10917b80ee44e973af2b40.tar.gz
updates
Diffstat (limited to '0001-kdbus-interprocess-message-router.patch')
-rw-r--r--0001-kdbus-interprocess-message-router.patch169
1 files changed, 155 insertions, 14 deletions
diff --git a/0001-kdbus-interprocess-message-router.patch b/0001-kdbus-interprocess-message-router.patch
index 04b341e89f2e97..22070abb7ff79a 100644
--- a/0001-kdbus-interprocess-message-router.patch
+++ b/0001-kdbus-interprocess-message-router.patch
@@ -8,15 +8,15 @@ Nothing to see here, move along...
drivers/Makefile | 1
drivers/kdbus/Kconfig | 5
drivers/kdbus/Makefile | 4
- drivers/kdbus/bus.c | 115 +++++++++++
- drivers/kdbus/ep.c | 189 ++++++++++++++++++
- drivers/kdbus/kdbus.c | 453 +++++++++++++++++++++++++++++++++++++++++++++
- drivers/kdbus/kdbus.h | 160 +++++++++++++++
- drivers/kdbus/ns.c | 208 ++++++++++++++++++++
- include/uapi/kdbus/kdbus.h | 86 ++++++++
+ drivers/kdbus/bus.c | 115 +++++++++
+ drivers/kdbus/ep.c | 189 +++++++++++++++
+ drivers/kdbus/kdbus.c | 565 +++++++++++++++++++++++++++++++++++++++++++++
+ drivers/kdbus/kdbus.h | 189 +++++++++++++++
+ drivers/kdbus/ns.c | 208 ++++++++++++++++
+ include/uapi/kdbus/kdbus.h | 86 ++++++
include/uapi/linux/major.h | 2
- kdbus.c | 77 +++++++
- 12 files changed, 1302 insertions(+)
+ kdbus.c | 77 ++++++
+ 12 files changed, 1443 insertions(+)
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -361,7 +361,7 @@ Nothing to see here, move along...
+
--- /dev/null
+++ b/drivers/kdbus/kdbus.c
-@@ -0,0 +1,453 @@
+@@ -0,0 +1,565 @@
+/*
+ * kdbus - interprocess message routing
+ *
@@ -434,7 +434,10 @@ Nothing to see here, move along...
+ .name = "kdbus",
+};
+
-+/* List of all namespaces in the system */
++/* List of all connections in the system. */
++/* Well, really only the endpoint connections,
++ * that's all we care about for now */
++static LIST_HEAD(connection_list);
+
+/* kdbus initial namespace */
+static struct kdbus_ns *kdbus_ns_init;
@@ -510,6 +513,11 @@ Nothing to see here, move along...
+ goto err_unlock;
+ }
+
++ spin_lock_init(&conn->msg_lock);
++ INIT_LIST_HEAD(&conn->msg_list);
++
++ list_add_tail(&connection_list, &conn->connection_entry);
++
+ file->private_data = conn;
+ mutex_unlock(&conn->ns->lock);
+
@@ -539,6 +547,7 @@ Nothing to see here, move along...
+
+ case KDBUS_CONN_EP:
+ kdbus_ep_unref(conn->ep);
++ list_del(&conn->connection_entry);
+ break;
+
+ default:
@@ -717,17 +726,118 @@ Nothing to see here, move along...
+ }
+}
+
-+static unsigned int kdbus_conn_poll(struct file *filep,
++static unsigned int kdbus_conn_poll(struct file *file,
+ struct poll_table_struct *wait)
+{
+ return 0;
+}
+
-+static int kdbus_conn_mmap(struct file *filep, struct vm_area_struct *vma)
++static int kdbus_conn_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ return -EINVAL;
+}
+
++static void kdbus_msg_release(struct kref *kref)
++{
++ struct kdbus_test_msg *msg = container_of(kref, struct kdbus_test_msg, kref);
++ kfree(msg);
++}
++
++static ssize_t kdbus_conn_write(struct file *file, const char __user *ubuf, size_t count, loff_t *ppos)
++{
++ struct kdbus_conn *conn = file->private_data;
++ struct kdbus_conn *temp_conn;
++ struct kdbus_test_msg *msg;
++
++ /* Only an endpoint can read/write data */
++ if (conn->type != KDBUS_CONN_EP)
++ return -EINVAL;
++
++ /* FIXME: Let's cap a message size at PAGE_SIZE for now */
++ if (count > PAGE_SIZE)
++ return -EINVAL;
++
++ if (count == 0)
++ return 0;
++
++ msg = kmalloc((sizeof(*msg) + count), GFP_KERNEL);
++ if (!msg)
++ return -ENOMEM;
++
++ if (copy_from_user(&msg->data[0], ubuf, count))
++ return -EFAULT;
++
++ kref_init(&msg->kref);
++ msg->length = count;
++
++ /* Walk the list of connections,
++ * find any endpoints that match our endpoint,
++ * create a kdbus_msg_list_entry for it,
++ * attach the message to the endpoint list,
++ * wake the connection up. */
++
++ /* what do we lock here? FIXME */
++
++ list_for_each_entry(temp_conn, &connection_list, connection_entry) {
++ if (temp_conn->type != KDBUS_CONN_EP)
++ continue;
++ if (temp_conn->ep == conn->ep) {
++ /* Matching endpoints */
++ struct kdbus_msg_list_entry *msg_list_entry;
++
++ msg_list_entry = kmalloc(sizeof(*msg_list_entry), GFP_KERNEL);
++ kref_get(&msg->kref);
++ msg_list_entry->msg = msg;
++ spin_lock(&temp_conn->msg_lock);
++ list_add_tail(&temp_conn->msg_list, &msg_list_entry->entry);
++ spin_unlock(&temp_conn->msg_lock);
++ /* wake up the other process. Somehow. FIXME!!! */
++ }
++ }
++
++ /* drop our reference on the message, as we are done with it */
++ kref_put(&msg->kref, kdbus_msg_release);
++ return count;
++}
++
++static ssize_t kdbus_conn_read(struct file *file, char __user *ubuf, size_t count, loff_t *ppos)
++{
++ struct kdbus_conn *conn = file->private_data;
++ struct kdbus_msg_list_entry *msg_list_entry;
++ struct kdbus_test_msg *msg;
++ ssize_t retval = 0;
++
++ /* Only an endpoint can read/write data */
++ if (conn->type != KDBUS_CONN_EP)
++ return -EINVAL;
++
++ if (count == 0)
++ return 0;
++
++ /* let's grab a message from our list to write out */
++ spin_lock(&conn->msg_lock);
++ if (!list_empty(&conn->msg_list)) {
++ msg_list_entry = list_entry(&conn->msg_list, struct kdbus_msg_list_entry, entry);
++ msg = msg_list_entry->msg;
++ if (msg->length > count) {
++ retval = -E2BIG; // FIXME wrong error code, I know, what should we use?
++ goto exit;
++ }
++ if (copy_to_user(ubuf, &msg->data[0], msg->length)) {
++ retval = -EFAULT;
++ goto exit;
++ }
++ list_del(&msg_list_entry->entry);
++ kfree(msg_list_entry);
++ retval = msg->length;
++ kref_put(&msg->kref, kdbus_msg_release);
++ }
++
++exit:
++ spin_unlock(&conn->msg_lock);
++ return retval;
++}
++
+const struct file_operations kdbus_device_ops = {
+ .owner = THIS_MODULE,
+ .open = kdbus_conn_open,
@@ -737,6 +847,8 @@ Nothing to see here, move along...
+ .poll = kdbus_conn_poll,
+ .mmap = kdbus_conn_mmap,
+ .llseek = noop_llseek,
++ .write = kdbus_conn_write,
++ .read = kdbus_conn_read,
+};
+
+static void kdbus_msg_free(struct kdbus_msg *msg)
@@ -817,7 +929,7 @@ Nothing to see here, move along...
+MODULE_ALIAS("devname:kdbus/control");
--- /dev/null
+++ b/drivers/kdbus/kdbus.h
-@@ -0,0 +1,160 @@
+@@ -0,0 +1,189 @@
+
+
+#ifndef __INTERNAL_KDBUS_H
@@ -888,7 +1000,8 @@ Nothing to see here, move along...
+ umode_t mode; /* file mode of this endpoint device node */
+ uid_t uid; /* uid owning this endpoint */
+ gid_t gid; /* gid owning this endpoint */
-+ struct list_head bus_entry;
++ struct list_head bus_entry; /* list of endpoints for this bus */
++ struct list_head message_list; /* messages in flight for this endpoint */
+};
+
+/*
@@ -912,6 +1025,21 @@ Nothing to see here, move along...
+ struct kdbus_ep *ep;
+ };
+ __u64 id; /* id of the connection on the bus */
++
++ /*
++ * first, horrible cut at messages assigned to connections
++ * odds are, this is going to be slow, but let's measure it first to
++ * see what the real numbers are, and where the bottlenecks are.
++ * Premature optimization and all...
++ */
++ spinlock_t msg_lock;
++ struct list_head msg_list;
++
++ /* Ugh a list of all connections in the system? Ugly, but we need to
++ * be able to walk them all somehow. Maybe just have a list on the
++ * endpoints of the connections associated with that endpoint? That's
++ * all we really need in the end... */
++ struct list_head connection_entry;
+};
+
+/* kdbus message */
@@ -942,6 +1070,19 @@ Nothing to see here, move along...
+ struct kdbus_msg_data *data;
+};
+
++
++/* To knock around with for now */
++struct kdbus_test_msg {
++ struct kref kref;
++ u32 length;
++ u8 data[0];
++};
++
++struct kdbus_msg_list_entry {
++ struct kdbus_test_msg *msg;
++ struct list_head entry;
++};
++
+/* namespace stuff */
+
+extern const struct file_operations kdbus_device_ops;
generated by cgit 1.2.3-korg (git 2.43.0) at 2026-03-01 19:08:54 +0000