Staging: HTC Dream: add rpcrouter driver

rpcrouter code is neccessarry for communication with QDSP and thus
many hardware components on HTC Dream, including camera hardware.


Cc: Brian Swetland <swetland@google.com>
Cc: Iliyan Malchev <ibm@android.com>
Cc: San Mehat <san@android.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

drivers/staging/dream/smd/Kconfig

@@ -0,0 +1,25 @@
+config MSM_SMD
+	default y
+	bool "MSM Shared Memory Driver (SMD)"
+	help
+	  Support for the shared memory interface between the apps
+	  processor and the baseband processor.  Provides access to
+	  the "shared heap", as well as virtual serial channels
+	  used to communicate with various services on the baseband
+	  processor.
+
+config MSM_ONCRPCROUTER
+	depends on MSM_SMD
+	default y
+	bool "MSM ONCRPC router support"
+	help
+	  Support for the MSM ONCRPC router for communication between
+	  the ARM9 and ARM11
+
+config MSM_RPCSERVERS
+	depends on MSM_ONCRPCROUTER
+	default y
+	bool "Kernel side RPC server bundle"
+	help
+	  none
+

drivers/staging/dream/smd/Makefile

@@ -0,0 +1,6 @@
+obj-$(CONFIG_MSM_SMD) += smd.o smd_tty.o smd_qmi.o
+obj-$(CONFIG_MSM_ONCRPCROUTER) += smd_rpcrouter.o
+obj-$(CONFIG_MSM_ONCRPCROUTER) += smd_rpcrouter_device.o
+obj-$(CONFIG_MSM_ONCRPCROUTER) += smd_rpcrouter_servers.o
+obj-$(CONFIG_MSM_RPCSERVERS) += rpc_server_dog_keepalive.o
+obj-$(CONFIG_MSM_RPCSERVERS) += rpc_server_time_remote.o

drivers/staging/dream/smd/rpc_server_dog_keepalive.c

@@ -0,0 +1,68 @@
+/* arch/arm/mach-msm/rpc_server_dog_keepalive.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Iliyan Malchev <ibm@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <mach/msm_rpcrouter.h>
+
+/* dog_keepalive server definitions */
+
+#define DOG_KEEPALIVE_PROG 0x30000015
+#if CONFIG_MSM_AMSS_VERSION==6210
+#define DOG_KEEPALIVE_VERS 0
+#define RPC_DOG_KEEPALIVE_BEACON 1
+#elif (CONFIG_MSM_AMSS_VERSION==6220) || (CONFIG_MSM_AMSS_VERSION==6225)
+#define DOG_KEEPALIVE_VERS 0x731fa727
+#define RPC_DOG_KEEPALIVE_BEACON 2
+#elif CONFIG_MSM_AMSS_VERSION==6350
+#define DOG_KEEPALIVE_VERS 0x00010000
+#define RPC_DOG_KEEPALIVE_BEACON 2
+#else
+#error "Unsupported AMSS version"
+#endif
+#define RPC_DOG_KEEPALIVE_NULL 0
+
+
+/* TODO: Remove server registration with _VERS when modem is upated with _COMP*/
+
+static int handle_rpc_call(struct msm_rpc_server *server,
+			   struct rpc_request_hdr *req, unsigned len)
+{
+	switch (req->procedure) {
+	case RPC_DOG_KEEPALIVE_NULL:
+		return 0;
+	case RPC_DOG_KEEPALIVE_BEACON:
+		printk(KERN_INFO "DOG KEEPALIVE PING\n");
+		return 0;
+	default:
+		return -ENODEV;
+	}
+}
+
+static struct msm_rpc_server rpc_server = {
+	.prog = DOG_KEEPALIVE_PROG,
+	.vers = DOG_KEEPALIVE_VERS,
+	.rpc_call = handle_rpc_call,
+};
+
+static int __init rpc_server_init(void)
+{
+	/* Dual server registration to support backwards compatibility vers */
+	return msm_rpc_create_server(&rpc_server);
+}
+
+
+module_init(rpc_server_init);

drivers/staging/dream/smd/rpc_server_time_remote.c

@@ -0,0 +1,77 @@
+/* arch/arm/mach-msm/rpc_server_time_remote.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Iliyan Malchev <ibm@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <mach/msm_rpcrouter.h>
+
+/* time_remote_mtoa server definitions. */
+
+#define TIME_REMOTE_MTOA_PROG 0x3000005d
+#if CONFIG_MSM_AMSS_VERSION==6210
+#define TIME_REMOTE_MTOA_VERS 0
+#elif (CONFIG_MSM_AMSS_VERSION==6220) || (CONFIG_MSM_AMSS_VERSION==6225)
+#define TIME_REMOTE_MTOA_VERS 0x9202a8e4
+#elif CONFIG_MSM_AMSS_VERSION==6350
+#define TIME_REMOTE_MTOA_VERS 0x00010000
+#else
+#error "Unknown AMSS version"
+#endif
+#define RPC_TIME_REMOTE_MTOA_NULL   0
+#define RPC_TIME_TOD_SET_APPS_BASES 2
+
+struct rpc_time_tod_set_apps_bases_args {
+	uint32_t tick;
+	uint64_t stamp;
+};
+
+static int handle_rpc_call(struct msm_rpc_server *server,
+			   struct rpc_request_hdr *req, unsigned len)
+{
+	switch (req->procedure) {
+	case RPC_TIME_REMOTE_MTOA_NULL:
+		return 0;
+
+	case RPC_TIME_TOD_SET_APPS_BASES: {
+		struct rpc_time_tod_set_apps_bases_args *args;
+		args = (struct rpc_time_tod_set_apps_bases_args *)(req + 1);
+		args->tick = be32_to_cpu(args->tick);
+		args->stamp = be64_to_cpu(args->stamp);
+		printk(KERN_INFO "RPC_TIME_TOD_SET_APPS_BASES:\n"
+		       "\ttick = %d\n"
+		       "\tstamp = %lld\n",
+		       args->tick, args->stamp);
+		return 0;
+	}
+	default:
+		return -ENODEV;
+	}
+}
+
+static struct msm_rpc_server rpc_server = {
+	.prog = TIME_REMOTE_MTOA_PROG,
+	.vers = TIME_REMOTE_MTOA_VERS,
+	.rpc_call = handle_rpc_call,
+};
+
+static int __init rpc_server_init(void)
+{
+	/* Dual server registration to support backwards compatibility vers */
+	return msm_rpc_create_server(&rpc_server);
+}
+
+
+module_init(rpc_server_init);

drivers/staging/dream/smd/smd_rpcrouter.c

@@ -0,0 +1,1274 @@
+/* arch/arm/mach-msm/smd_rpcrouter.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2007-2009 QUALCOMM Incorporated.
+ * Author: San Mehat <san@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ */
+
+/* TODO: handle cases where smd_write() will tempfail due to full fifo */
+/* TODO: thread priority? schedule a work to bump it? */
+/* TODO: maybe make server_list_lock a mutex */
+/* TODO: pool fragments to avoid kmalloc/kfree churn */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/cdev.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/err.h>
+#include <linux/sched.h>
+#include <linux/poll.h>
+#include <linux/wakelock.h>
+#include <asm/uaccess.h>
+#include <asm/byteorder.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+
+#include <asm/byteorder.h>
+
+#include <mach/msm_smd.h>
+#include "smd_rpcrouter.h"
+
+#define TRACE_R2R_MSG 0
+#define TRACE_R2R_RAW 0
+#define TRACE_RPC_MSG 0
+#define TRACE_NOTIFY_MSG 0
+
+#define MSM_RPCROUTER_DEBUG 0
+#define MSM_RPCROUTER_DEBUG_PKT 0
+#define MSM_RPCROUTER_R2R_DEBUG 0
+#define DUMP_ALL_RECEIVED_HEADERS 0
+
+#define DIAG(x...) printk("[RR] ERROR " x)
+
+#if MSM_RPCROUTER_DEBUG
+#define D(x...) printk(x)
+#else
+#define D(x...) do {} while (0)
+#endif
+
+#if TRACE_R2R_MSG
+#define RR(x...) printk("[RR] "x)
+#else
+#define RR(x...) do {} while (0)
+#endif
+
+#if TRACE_RPC_MSG
+#define IO(x...) printk("[RPC] "x)
+#else
+#define IO(x...) do {} while (0)
+#endif
+
+#if TRACE_NOTIFY_MSG
+#define NTFY(x...) printk(KERN_ERR "[NOTIFY] "x)
+#else
+#define NTFY(x...) do {} while (0)
+#endif
+
+static LIST_HEAD(local_endpoints);
+static LIST_HEAD(remote_endpoints);
+
+static LIST_HEAD(server_list);
+
+static smd_channel_t *smd_channel;
+static int initialized;
+static wait_queue_head_t newserver_wait;
+static wait_queue_head_t smd_wait;
+
+static DEFINE_SPINLOCK(local_endpoints_lock);
+static DEFINE_SPINLOCK(remote_endpoints_lock);
+static DEFINE_SPINLOCK(server_list_lock);
+static DEFINE_SPINLOCK(smd_lock);
+
+static struct workqueue_struct *rpcrouter_workqueue;
+static struct wake_lock rpcrouter_wake_lock;
+static int rpcrouter_need_len;
+
+static atomic_t next_xid = ATOMIC_INIT(1);
+static uint8_t next_pacmarkid;
+
+static void do_read_data(struct work_struct *work);
+static void do_create_pdevs(struct work_struct *work);
+static void do_create_rpcrouter_pdev(struct work_struct *work);
+
+static DECLARE_WORK(work_read_data, do_read_data);
+static DECLARE_WORK(work_create_pdevs, do_create_pdevs);
+static DECLARE_WORK(work_create_rpcrouter_pdev, do_create_rpcrouter_pdev);
+
+#define RR_STATE_IDLE    0
+#define RR_STATE_HEADER  1
+#define RR_STATE_BODY    2
+#define RR_STATE_ERROR   3
+
+struct rr_context {
+	struct rr_packet *pkt;
+	uint8_t *ptr;
+	uint32_t state; /* current assembly state */
+	uint32_t count; /* bytes needed in this state */
+};
+
+struct rr_context the_rr_context;
+
+static struct platform_device rpcrouter_pdev = {
+	.name		= "oncrpc_router",
+	.id		= -1,
+};
+
+
+static int rpcrouter_send_control_msg(union rr_control_msg *msg)
+{
+	struct rr_header hdr;
+	unsigned long flags;
+	int need;
+
+	if (!(msg->cmd == RPCROUTER_CTRL_CMD_HELLO) && !initialized) {
+		printk(KERN_ERR "rpcrouter_send_control_msg(): Warning, "
+		       "router not initialized\n");
+		return -EINVAL;
+	}
+
+	hdr.version = RPCROUTER_VERSION;
+	hdr.type = msg->cmd;
+	hdr.src_pid = RPCROUTER_PID_LOCAL;
+	hdr.src_cid = RPCROUTER_ROUTER_ADDRESS;
+	hdr.confirm_rx = 0;
+	hdr.size = sizeof(*msg);
+	hdr.dst_pid = 0;
+	hdr.dst_cid = RPCROUTER_ROUTER_ADDRESS;
+
+	/* TODO: what if channel is full? */
+
+	need = sizeof(hdr) + hdr.size;
+	spin_lock_irqsave(&smd_lock, flags);
+	while (smd_write_avail(smd_channel) < need) {
+		spin_unlock_irqrestore(&smd_lock, flags);
+		msleep(250);
+		spin_lock_irqsave(&smd_lock, flags);
+	}
+	smd_write(smd_channel, &hdr, sizeof(hdr));
+	smd_write(smd_channel, msg, hdr.size);
+	spin_unlock_irqrestore(&smd_lock, flags);
+	return 0;
+}
+
+static struct rr_server *rpcrouter_create_server(uint32_t pid,
+							uint32_t cid,
+							uint32_t prog,
+							uint32_t ver)
+{
+	struct rr_server *server;
+	unsigned long flags;
+	int rc;
+
+	server = kmalloc(sizeof(struct rr_server), GFP_KERNEL);
+	if (!server)
+		return ERR_PTR(-ENOMEM);
+
+	memset(server, 0, sizeof(struct rr_server));
+	server->pid = pid;
+	server->cid = cid;
+	server->prog = prog;
+	server->vers = ver;
+
+	spin_lock_irqsave(&server_list_lock, flags);
+	list_add_tail(&server->list, &server_list);
+	spin_unlock_irqrestore(&server_list_lock, flags);
+
+	if (pid == RPCROUTER_PID_REMOTE) {
+		rc = msm_rpcrouter_create_server_cdev(server);
+		if (rc < 0)
+			goto out_fail;
+	}
+	return server;
+out_fail:
+	spin_lock_irqsave(&server_list_lock, flags);
+	list_del(&server->list);
+	spin_unlock_irqrestore(&server_list_lock, flags);
+	kfree(server);
+	return ERR_PTR(rc);
+}
+
+static void rpcrouter_destroy_server(struct rr_server *server)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&server_list_lock, flags);
+	list_del(&server->list);
+	spin_unlock_irqrestore(&server_list_lock, flags);
+	device_destroy(msm_rpcrouter_class, server->device_number);
+	kfree(server);
+}
+
+static struct rr_server *rpcrouter_lookup_server(uint32_t prog, uint32_t ver)
+{
+	struct rr_server *server;
+	unsigned long flags;
+
+	spin_lock_irqsave(&server_list_lock, flags);
+	list_for_each_entry(server, &server_list, list) {
+		if (server->prog == prog
+		 && server->vers == ver) {
+			spin_unlock_irqrestore(&server_list_lock, flags);
+			return server;
+		}
+	}
+	spin_unlock_irqrestore(&server_list_lock, flags);
+	return NULL;
+}
+
+static struct rr_server *rpcrouter_lookup_server_by_dev(dev_t dev)
+{
+	struct rr_server *server;
+	unsigned long flags;
+
+	spin_lock_irqsave(&server_list_lock, flags);
+	list_for_each_entry(server, &server_list, list) {
+		if (server->device_number == dev) {
+			spin_unlock_irqrestore(&server_list_lock, flags);
+			return server;
+		}
+	}
+	spin_unlock_irqrestore(&server_list_lock, flags);
+	return NULL;
+}
+
+struct msm_rpc_endpoint *msm_rpcrouter_create_local_endpoint(dev_t dev)
+{
+	struct msm_rpc_endpoint *ept;
+	unsigned long flags;
+
+	ept = kmalloc(sizeof(struct msm_rpc_endpoint), GFP_KERNEL);
+	if (!ept)
+		return NULL;
+	memset(ept, 0, sizeof(struct msm_rpc_endpoint));
+
+	/* mark no reply outstanding */
+	ept->reply_pid = 0xffffffff;
+
+	ept->cid = (uint32_t) ept;
+	ept->pid = RPCROUTER_PID_LOCAL;
+	ept->dev = dev;
+
+	if ((dev != msm_rpcrouter_devno) && (dev != MKDEV(0, 0))) {
+		struct rr_server *srv;
+		/*
+		 * This is a userspace client which opened
+		 * a program/ver devicenode. Bind the client
+		 * to that destination
+		 */
+		srv = rpcrouter_lookup_server_by_dev(dev);
+		/* TODO: bug? really? */
+		BUG_ON(!srv);
+
+		ept->dst_pid = srv->pid;
+		ept->dst_cid = srv->cid;
+		ept->dst_prog = cpu_to_be32(srv->prog);
+		ept->dst_vers = cpu_to_be32(srv->vers);
+
+		D("Creating local ept %p @ %08x:%08x\n", ept, srv->prog, srv->vers);
+	} else {
+		/* mark not connected */
+		ept->dst_pid = 0xffffffff;
+		D("Creating a master local ept %p\n", ept);
+	}
+
+	init_waitqueue_head(&ept->wait_q);
+	INIT_LIST_HEAD(&ept->read_q);
+	spin_lock_init(&ept->read_q_lock);
+	wake_lock_init(&ept->read_q_wake_lock, WAKE_LOCK_SUSPEND, "rpc_read");
+	INIT_LIST_HEAD(&ept->incomplete);
+
+	spin_lock_irqsave(&local_endpoints_lock, flags);
+	list_add_tail(&ept->list, &local_endpoints);
+	spin_unlock_irqrestore(&local_endpoints_lock, flags);
+	return ept;
+}
+
+int msm_rpcrouter_destroy_local_endpoint(struct msm_rpc_endpoint *ept)
+{
+	int rc;
+	union rr_control_msg msg;
+
+	msg.cmd = RPCROUTER_CTRL_CMD_REMOVE_CLIENT;
+	msg.cli.pid = ept->pid;
+	msg.cli.cid = ept->cid;
+
+	RR("x REMOVE_CLIENT id=%d:%08x\n", ept->pid, ept->cid);
+	rc = rpcrouter_send_control_msg(&msg);
+	if (rc < 0)
+		return rc;
+
+	wake_lock_destroy(&ept->read_q_wake_lock);
+	list_del(&ept->list);
+	kfree(ept);
+	return 0;
+}
+
+static int rpcrouter_create_remote_endpoint(uint32_t cid)
+{
+	struct rr_remote_endpoint *new_c;
+	unsigned long flags;
+
+	new_c = kmalloc(sizeof(struct rr_remote_endpoint), GFP_KERNEL);
+	if (!new_c)
+		return -ENOMEM;
+	memset(new_c, 0, sizeof(struct rr_remote_endpoint));
+
+	new_c->cid = cid;
+	new_c->pid = RPCROUTER_PID_REMOTE;
+	init_waitqueue_head(&new_c->quota_wait);
+	spin_lock_init(&new_c->quota_lock);
+
+	spin_lock_irqsave(&remote_endpoints_lock, flags);
+	list_add_tail(&new_c->list, &remote_endpoints);
+	spin_unlock_irqrestore(&remote_endpoints_lock, flags);
+	return 0;
+}
+
+static struct msm_rpc_endpoint *rpcrouter_lookup_local_endpoint(uint32_t cid)
+{
+	struct msm_rpc_endpoint *ept;
+	unsigned long flags;
+
+	spin_lock_irqsave(&local_endpoints_lock, flags);
+	list_for_each_entry(ept, &local_endpoints, list) {
+		if (ept->cid == cid) {
+			spin_unlock_irqrestore(&local_endpoints_lock, flags);
+			return ept;
+		}
+	}
+	spin_unlock_irqrestore(&local_endpoints_lock, flags);
+	return NULL;
+}
+
+static struct rr_remote_endpoint *rpcrouter_lookup_remote_endpoint(uint32_t cid)
+{
+	struct rr_remote_endpoint *ept;
+	unsigned long flags;
+
+	spin_lock_irqsave(&remote_endpoints_lock, flags);
+	list_for_each_entry(ept, &remote_endpoints, list) {
+		if (ept->cid == cid) {
+			spin_unlock_irqrestore(&remote_endpoints_lock, flags);
+			return ept;
+		}
+	}
+	spin_unlock_irqrestore(&remote_endpoints_lock, flags);
+	return NULL;
+}
+
+static int process_control_msg(union rr_control_msg *msg, int len)
+{
+	union rr_control_msg ctl;
+	struct rr_server *server;
+	struct rr_remote_endpoint *r_ept;
+	int rc = 0;
+	unsigned long flags;
+
+	if (len != sizeof(*msg)) {
+		printk(KERN_ERR "rpcrouter: r2r msg size %d != %d\n",
+		       len, sizeof(*msg));
+		return -EINVAL;
+	}
+
+	switch (msg->cmd) {
+	case RPCROUTER_CTRL_CMD_HELLO:
+		RR("o HELLO\n");
+
+		RR("x HELLO\n");
+		memset(&ctl, 0, sizeof(ctl));
+		ctl.cmd = RPCROUTER_CTRL_CMD_HELLO;
+		rpcrouter_send_control_msg(&ctl);
+
+		initialized = 1;
+
+		/* Send list of servers one at a time */
+		ctl.cmd = RPCROUTER_CTRL_CMD_NEW_SERVER;
+
+		/* TODO: long time to hold a spinlock... */
+		spin_lock_irqsave(&server_list_lock, flags);
+		list_for_each_entry(server, &server_list, list) {
+			ctl.srv.pid = server->pid;
+			ctl.srv.cid = server->cid;
+			ctl.srv.prog = server->prog;
+			ctl.srv.vers = server->vers;
+
+			RR("x NEW_SERVER id=%d:%08x prog=%08x:%08x\n",
+			   server->pid, server->cid,
+			   server->prog, server->vers);
+
+			rpcrouter_send_control_msg(&ctl);
+		}
+		spin_unlock_irqrestore(&server_list_lock, flags);
+
+		queue_work(rpcrouter_workqueue, &work_create_rpcrouter_pdev);
+		break;
+
+	case RPCROUTER_CTRL_CMD_RESUME_TX:
+		RR("o RESUME_TX id=%d:%08x\n", msg->cli.pid, msg->cli.cid);
+
+		r_ept = rpcrouter_lookup_remote_endpoint(msg->cli.cid);
+		if (!r_ept) {
+			printk(KERN_ERR
+			       "rpcrouter: Unable to resume client\n");
+			break;
+		}
+		spin_lock_irqsave(&r_ept->quota_lock, flags);
+		r_ept->tx_quota_cntr = 0;
+		spin_unlock_irqrestore(&r_ept->quota_lock, flags);
+		wake_up(&r_ept->quota_wait);
+		break;
+
+	case RPCROUTER_CTRL_CMD_NEW_SERVER:
+		RR("o NEW_SERVER id=%d:%08x prog=%08x:%08x\n",
+		   msg->srv.pid, msg->srv.cid, msg->srv.prog, msg->srv.vers);
+
+		server = rpcrouter_lookup_server(msg->srv.prog, msg->srv.vers);
+
+		if (!server) {
+			server = rpcrouter_create_server(
+				msg->srv.pid, msg->srv.cid,
+				msg->srv.prog, msg->srv.vers);
+			if (!server)
+				return -ENOMEM;
+			/*
+			 * XXX: Verify that its okay to add the
+			 * client to our remote client list
+			 * if we get a NEW_SERVER notification
+			 */
+			if (!rpcrouter_lookup_remote_endpoint(msg->srv.cid)) {
+				rc = rpcrouter_create_remote_endpoint(
+					msg->srv.cid);
+				if (rc < 0)
+					printk(KERN_ERR
+						"rpcrouter:Client create"
+						"error (%d)\n", rc);
+			}
+			schedule_work(&work_create_pdevs);
+			wake_up(&newserver_wait);
+		} else {
+			if ((server->pid == msg->srv.pid) &&
+			    (server->cid == msg->srv.cid)) {
+				printk(KERN_ERR "rpcrouter: Duplicate svr\n");
+			} else {
+				server->pid = msg->srv.pid;
+				server->cid = msg->srv.cid;
+			}
+		}
+		break;
+
+	case RPCROUTER_CTRL_CMD_REMOVE_SERVER:
+		RR("o REMOVE_SERVER prog=%08x:%d\n",
+		   msg->srv.prog, msg->srv.vers);
+		server = rpcrouter_lookup_server(msg->srv.prog, msg->srv.vers);
+		if (server)
+			rpcrouter_destroy_server(server);
+		break;
+
+	case RPCROUTER_CTRL_CMD_REMOVE_CLIENT:
+		RR("o REMOVE_CLIENT id=%d:%08x\n", msg->cli.pid, msg->cli.cid);
+		if (msg->cli.pid != RPCROUTER_PID_REMOTE) {
+			printk(KERN_ERR
+			       "rpcrouter: Denying remote removal of "
+			       "local client\n");
+			break;
+		}
+		r_ept = rpcrouter_lookup_remote_endpoint(msg->cli.cid);
+		if (r_ept) {
+			spin_lock_irqsave(&remote_endpoints_lock, flags);
+			list_del(&r_ept->list);
+			spin_unlock_irqrestore(&remote_endpoints_lock, flags);
+			kfree(r_ept);
+		}
+
+		/* Notify local clients of this event */
+		printk(KERN_ERR "rpcrouter: LOCAL NOTIFICATION NOT IMP\n");
+		rc = -ENOSYS;
+
+		break;
+	default:
+		RR("o UNKNOWN(%08x)\n", msg->cmd);
+		rc = -ENOSYS;
+	}
+
+	return rc;
+}
+
+static void do_create_rpcrouter_pdev(struct work_struct *work)
+{
+	platform_device_register(&rpcrouter_pdev);
+}
+
+static void do_create_pdevs(struct work_struct *work)
+{
+	unsigned long flags;
+	struct rr_server *server;
+
+	/* TODO: race if destroyed while being registered */
+	spin_lock_irqsave(&server_list_lock, flags);
+	list_for_each_entry(server, &server_list, list) {
+		if (server->pid == RPCROUTER_PID_REMOTE) {
+			if (server->pdev_name[0] == 0) {
+				spin_unlock_irqrestore(&server_list_lock,
+						       flags);
+				msm_rpcrouter_create_server_pdev(server);
+				schedule_work(&work_create_pdevs);
+				return;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&server_list_lock, flags);
+}
+
+static void rpcrouter_smdnotify(void *_dev, unsigned event)
+{
+	if (event != SMD_EVENT_DATA)
+		return;
+
+	if (smd_read_avail(smd_channel) >= rpcrouter_need_len)
+		wake_lock(&rpcrouter_wake_lock);
+	wake_up(&smd_wait);
+}
+
+static void *rr_malloc(unsigned sz)
+{
+	void *ptr = kmalloc(sz, GFP_KERNEL);
+	if (ptr)
+		return ptr;
+
+	printk(KERN_ERR "rpcrouter: kmalloc of %d failed, retrying...\n", sz);
+	do {
+		ptr = kmalloc(sz, GFP_KERNEL);
+	} while (!ptr);
+
+	return ptr;
+}
+
+/* TODO: deal with channel teardown / restore */
+static int rr_read(void *data, int len)
+{
+	int rc;
+	unsigned long flags;
+//	printk("rr_read() %d\n", len);
+	for(;;) {
+		spin_lock_irqsave(&smd_lock, flags);
+		if (smd_read_avail(smd_channel) >= len) {
+			rc = smd_read(smd_channel, data, len);
+			spin_unlock_irqrestore(&smd_lock, flags);
+			if (rc == len)
+				return 0;
+			else
+				return -EIO;
+		}
+		rpcrouter_need_len = len;
+		wake_unlock(&rpcrouter_wake_lock);
+		spin_unlock_irqrestore(&smd_lock, flags);
+
+//		printk("rr_read: waiting (%d)\n", len);
+		wait_event(smd_wait, smd_read_avail(smd_channel) >= len);
+	}
+	return 0;
+}
+
+static uint32_t r2r_buf[RPCROUTER_MSGSIZE_MAX];
+
+static void do_read_data(struct work_struct *work)
+{
+	struct rr_header hdr;
+	struct rr_packet *pkt;
+	struct rr_fragment *frag;
+	struct msm_rpc_endpoint *ept;
+	uint32_t pm, mid;
+	unsigned long flags;
+
+	if (rr_read(&hdr, sizeof(hdr)))
+		goto fail_io;
+
+#if TRACE_R2R_RAW
+	RR("- ver=%d type=%d src=%d:%08x crx=%d siz=%d dst=%d:%08x\n",
+	   hdr.version, hdr.type, hdr.src_pid, hdr.src_cid,
+	   hdr.confirm_rx, hdr.size, hdr.dst_pid, hdr.dst_cid);
+#endif
+
+	if (hdr.version != RPCROUTER_VERSION) {
+		DIAG("version %d != %d\n", hdr.version, RPCROUTER_VERSION);
+		goto fail_data;
+	}
+	if (hdr.size > RPCROUTER_MSGSIZE_MAX) {
+		DIAG("msg size %d > max %d\n", hdr.size, RPCROUTER_MSGSIZE_MAX);
+		goto fail_data;
+	}
+
+	if (hdr.dst_cid == RPCROUTER_ROUTER_ADDRESS) {
+		if (rr_read(r2r_buf, hdr.size))
+			goto fail_io;
+		process_control_msg((void*) r2r_buf, hdr.size);
+		goto done;
+	}
+
+	if (hdr.size < sizeof(pm)) {
+		DIAG("runt packet (no pacmark)\n");
+		goto fail_data;
+	}
+	if (rr_read(&pm, sizeof(pm)))
+		goto fail_io;
+
+	hdr.size -= sizeof(pm);
+
+	frag = rr_malloc(hdr.size + sizeof(*frag));
+	frag->next = NULL;
+	frag->length = hdr.size;
+	if (rr_read(frag->data, hdr.size))
+		goto fail_io;
+
+	ept = rpcrouter_lookup_local_endpoint(hdr.dst_cid);
+	if (!ept) {
+		DIAG("no local ept for cid %08x\n", hdr.dst_cid);
+		kfree(frag);
+		goto done;
+	}
+
+	/* See if there is already a partial packet that matches our mid
+	 * and if so, append this fragment to that packet.
+	 */
+	mid = PACMARK_MID(pm);
+	list_for_each_entry(pkt, &ept->incomplete, list) {
+		if (pkt->mid == mid) {
+			pkt->last->next = frag;
+			pkt->last = frag;
+			pkt->length += frag->length;
+			if (PACMARK_LAST(pm)) {
+				list_del(&pkt->list);
+				goto packet_complete;
+			}
+			goto done;
+		}
+	}
+	/* This mid is new -- create a packet for it, and put it on
+	 * the incomplete list if this fragment is not a last fragment,
+	 * otherwise put it on the read queue.
+	 */
+	pkt = rr_malloc(sizeof(struct rr_packet));
+	pkt->first = frag;
+	pkt->last = frag;
+	memcpy(&pkt->hdr, &hdr, sizeof(hdr));
+	pkt->mid = mid;
+	pkt->length = frag->length;
+	if (!PACMARK_LAST(pm)) {
+		list_add_tail(&pkt->list, &ept->incomplete);
+		goto done;
+	}
+
+packet_complete:
+	spin_lock_irqsave(&ept->read_q_lock, flags);
+	wake_lock(&ept->read_q_wake_lock);
+	list_add_tail(&pkt->list, &ept->read_q);
+	wake_up(&ept->wait_q);
+	spin_unlock_irqrestore(&ept->read_q_lock, flags);
+done:
+
+	if (hdr.confirm_rx) {
+		union rr_control_msg msg;
+
+		msg.cmd = RPCROUTER_CTRL_CMD_RESUME_TX;
+		msg.cli.pid = hdr.dst_pid;
+		msg.cli.cid = hdr.dst_cid;
+
+		RR("x RESUME_TX id=%d:%08x\n", msg.cli.pid, msg.cli.cid);
+		rpcrouter_send_control_msg(&msg);
+	}
+
+	queue_work(rpcrouter_workqueue, &work_read_data);
+	return;
+
+fail_io:
+fail_data:
+	printk(KERN_ERR "rpc_router has died\n");
+	wake_unlock(&rpcrouter_wake_lock);
+}
+
+void msm_rpc_setup_req(struct rpc_request_hdr *hdr, uint32_t prog,
+		       uint32_t vers, uint32_t proc)
+{
+	memset(hdr, 0, sizeof(struct rpc_request_hdr));
+	hdr->xid = cpu_to_be32(atomic_add_return(1, &next_xid));
+	hdr->rpc_vers = cpu_to_be32(2);
+	hdr->prog = cpu_to_be32(prog);
+	hdr->vers = cpu_to_be32(vers);
+	hdr->procedure = cpu_to_be32(proc);
+}
+
+struct msm_rpc_endpoint *msm_rpc_open(void)
+{
+	struct msm_rpc_endpoint *ept;
+
+	ept = msm_rpcrouter_create_local_endpoint(MKDEV(0, 0));
+	if (ept == NULL)
+		return ERR_PTR(-ENOMEM);
+
+	return ept;
+}
+
+int msm_rpc_close(struct msm_rpc_endpoint *ept)
+{
+	return msm_rpcrouter_destroy_local_endpoint(ept);
+}
+EXPORT_SYMBOL(msm_rpc_close);
+
+int msm_rpc_write(struct msm_rpc_endpoint *ept, void *buffer, int count)
+{
+	struct rr_header hdr;
+	uint32_t pacmark;
+	struct rpc_request_hdr *rq = buffer;
+	struct rr_remote_endpoint *r_ept;
+	unsigned long flags;
+	int needed;
+	DEFINE_WAIT(__wait);
+
+	/* TODO: fragmentation for large outbound packets */
+	if (count > (RPCROUTER_MSGSIZE_MAX - sizeof(uint32_t)) || !count)
+		return -EINVAL;
+
+	/* snoop the RPC packet and enforce permissions */
+
+	/* has to have at least the xid and type fields */
+	if (count < (sizeof(uint32_t) * 2)) {
+		printk(KERN_ERR "rr_write: rejecting runt packet\n");
+		return -EINVAL;
+	}
+
+	if (rq->type == 0) {
+		/* RPC CALL */
+		if (count < (sizeof(uint32_t) * 6)) {
+			printk(KERN_ERR
+			       "rr_write: rejecting runt call packet\n");
+			return -EINVAL;
+		}
+		if (ept->dst_pid == 0xffffffff) {
+			printk(KERN_ERR "rr_write: not connected\n");
+			return -ENOTCONN;
+		}
+
+#if CONFIG_MSM_AMSS_VERSION >= 6350
+		if ((ept->dst_prog != rq->prog) ||
+			!msm_rpc_is_compatible_version(
+					be32_to_cpu(ept->dst_vers),
+					be32_to_cpu(rq->vers))) {
+#else
+		if (ept->dst_prog != rq->prog || ept->dst_vers != rq->vers) {
+#endif
+			printk(KERN_ERR
+			       "rr_write: cannot write to %08x:%d "
+			       "(bound to %08x:%d)\n",
+			       be32_to_cpu(rq->prog), be32_to_cpu(rq->vers),
+			       be32_to_cpu(ept->dst_prog),
+			       be32_to_cpu(ept->dst_vers));
+			return -EINVAL;
+		}
+		hdr.dst_pid = ept->dst_pid;
+		hdr.dst_cid = ept->dst_cid;
+		IO("CALL on ept %p to %08x:%08x @ %d:%08x (%d bytes) (xid %x proc %x)\n",
+		   ept,
+		   be32_to_cpu(rq->prog), be32_to_cpu(rq->vers),
+		   ept->dst_pid, ept->dst_cid, count,
+		   be32_to_cpu(rq->xid), be32_to_cpu(rq->procedure));
+	} else {
+		/* RPC REPLY */
+		/* TODO: locking */
+		if (ept->reply_pid == 0xffffffff) {
+			printk(KERN_ERR
+			       "rr_write: rejecting unexpected reply\n");
+			return -EINVAL;
+		}
+		if (ept->reply_xid != rq->xid) {
+			printk(KERN_ERR
+			       "rr_write: rejecting packet w/ bad xid\n");
+			return -EINVAL;
+		}
+
+		hdr.dst_pid = ept->reply_pid;
+		hdr.dst_cid = ept->reply_cid;
+
+		/* consume this reply */
+		ept->reply_pid = 0xffffffff;
+
+		IO("REPLY on ept %p to xid=%d @ %d:%08x (%d bytes)\n",
+		   ept,
+		   be32_to_cpu(rq->xid), hdr.dst_pid, hdr.dst_cid, count);
+	}
+
+	r_ept = rpcrouter_lookup_remote_endpoint(hdr.dst_cid);
+
+	if (!r_ept) {
+		printk(KERN_ERR
+			"msm_rpc_write(): No route to ept "
+			"[PID %x CID %x]\n", hdr.dst_pid, hdr.dst_cid);
+		return -EHOSTUNREACH;
+	}
+
+	/* Create routing header */
+	hdr.type = RPCROUTER_CTRL_CMD_DATA;
+	hdr.version = RPCROUTER_VERSION;
+	hdr.src_pid = ept->pid;
+	hdr.src_cid = ept->cid;
+	hdr.confirm_rx = 0;
+	hdr.size = count + sizeof(uint32_t);
+
+	for (;;) {
+		prepare_to_wait(&r_ept->quota_wait, &__wait,
+				TASK_INTERRUPTIBLE);
+		spin_lock_irqsave(&r_ept->quota_lock, flags);
+		if (r_ept->tx_quota_cntr < RPCROUTER_DEFAULT_RX_QUOTA)
+			break;
+		if (signal_pending(current) &&
+		    (!(ept->flags & MSM_RPC_UNINTERRUPTIBLE)))
+			break;
+		spin_unlock_irqrestore(&r_ept->quota_lock, flags);
+		schedule();
+	}
+	finish_wait(&r_ept->quota_wait, &__wait);
+
+	if (signal_pending(current) &&
+	    (!(ept->flags & MSM_RPC_UNINTERRUPTIBLE))) {
+		spin_unlock_irqrestore(&r_ept->quota_lock, flags);
+		return -ERESTARTSYS;
+	}
+	r_ept->tx_quota_cntr++;
+	if (r_ept->tx_quota_cntr == RPCROUTER_DEFAULT_RX_QUOTA)
+		hdr.confirm_rx = 1;
+
+	/* bump pacmark while interrupts disabled to avoid race
+	 * probably should be atomic op instead
+	 */
+	pacmark = PACMARK(count, ++next_pacmarkid, 0, 1);
+
+	spin_unlock_irqrestore(&r_ept->quota_lock, flags);
+
+	spin_lock_irqsave(&smd_lock, flags);
+
+	needed = sizeof(hdr) + hdr.size;
+	while (smd_write_avail(smd_channel) < needed) {
+		spin_unlock_irqrestore(&smd_lock, flags);
+		msleep(250);
+		spin_lock_irqsave(&smd_lock, flags);
+	}
+
+	/* TODO: deal with full fifo */
+	smd_write(smd_channel, &hdr, sizeof(hdr));
+	smd_write(smd_channel, &pacmark, sizeof(pacmark));
+	smd_write(smd_channel, buffer, count);
+
+	spin_unlock_irqrestore(&smd_lock, flags);
+
+	return count;
+}
+EXPORT_SYMBOL(msm_rpc_write);
+
+/*
+ * NOTE: It is the responsibility of the caller to kfree buffer
+ */
+int msm_rpc_read(struct msm_rpc_endpoint *ept, void **buffer,
+		 unsigned user_len, long timeout)
+{
+	struct rr_fragment *frag, *next;
+	char *buf;
+	int rc;
+
+	rc = __msm_rpc_read(ept, &frag, user_len, timeout);
+	if (rc <= 0)
+		return rc;
+
+	/* single-fragment messages conveniently can be
+	 * returned as-is (the buffer is at the front)
+	 */
+	if (frag->next == 0) {
+		*buffer = (void*) frag;
+		return rc;
+	}
+
+	/* multi-fragment messages, we have to do it the
+	 * hard way, which is rather disgusting right now
+	 */
+	buf = rr_malloc(rc);
+	*buffer = buf;
+
+	while (frag != NULL) {
+		memcpy(buf, frag->data, frag->length);
+		next = frag->next;
+		buf += frag->length;
+		kfree(frag);
+		frag = next;
+	}
+
+	return rc;
+}
+
+int msm_rpc_call(struct msm_rpc_endpoint *ept, uint32_t proc,
+		 void *_request, int request_size,
+		 long timeout)
+{
+	return msm_rpc_call_reply(ept, proc,
+				  _request, request_size,
+				  NULL, 0, timeout);
+}
+EXPORT_SYMBOL(msm_rpc_call);
+
+int msm_rpc_call_reply(struct msm_rpc_endpoint *ept, uint32_t proc,
+		       void *_request, int request_size,
+		       void *_reply, int reply_size,
+		       long timeout)
+{
+	struct rpc_request_hdr *req = _request;
+	struct rpc_reply_hdr *reply;
+	int rc;
+
+	if (request_size < sizeof(*req))
+		return -ETOOSMALL;
+
+	if (ept->dst_pid == 0xffffffff)
+		return -ENOTCONN;
+
+	/* We can't use msm_rpc_setup_req() here, because dst_prog and
+	 * dst_vers here are already in BE.
+	 */
+	memset(req, 0, sizeof(*req));
+	req->xid = cpu_to_be32(atomic_add_return(1, &next_xid));
+	req->rpc_vers = cpu_to_be32(2);
+	req->prog = ept->dst_prog;
+	req->vers = ept->dst_vers;
+	req->procedure = cpu_to_be32(proc);
+
+	rc = msm_rpc_write(ept, req, request_size);
+	if (rc < 0)
+		return rc;
+
+	for (;;) {
+		rc = msm_rpc_read(ept, (void*) &reply, -1, timeout);
+		if (rc < 0)
+			return rc;
+		if (rc < (3 * sizeof(uint32_t))) {
+			rc = -EIO;
+			break;
+		}
+		/* we should not get CALL packets -- ignore them */
+		if (reply->type == 0) {
+			kfree(reply);
+			continue;
+		}
+		/* If an earlier call timed out, we could get the (no
+		 * longer wanted) reply for it.  Ignore replies that
+		 * we don't expect.
+		 */
+		if (reply->xid != req->xid) {
+			kfree(reply);
+			continue;
+		}
+		if (reply->reply_stat != 0) {
+			rc = -EPERM;
+			break;
+		}
+		if (reply->data.acc_hdr.accept_stat != 0) {
+			rc = -EINVAL;
+			break;
+		}
+		if (_reply == NULL) {
+			rc = 0;
+			break;
+		}
+		if (rc > reply_size) {
+			rc = -ENOMEM;
+		} else {
+			memcpy(_reply, reply, rc);
+		}
+		break;
+	}
+	kfree(reply);
+	return rc;
+}
+EXPORT_SYMBOL(msm_rpc_call_reply);
+
+
+static inline int ept_packet_available(struct msm_rpc_endpoint *ept)
+{
+	unsigned long flags;
+	int ret;
+	spin_lock_irqsave(&ept->read_q_lock, flags);
+	ret = !list_empty(&ept->read_q);
+	spin_unlock_irqrestore(&ept->read_q_lock, flags);
+	return ret;
+}
+
+int __msm_rpc_read(struct msm_rpc_endpoint *ept,
+		   struct rr_fragment **frag_ret,
+		   unsigned len, long timeout)
+{
+	struct rr_packet *pkt;
+	struct rpc_request_hdr *rq;
+	DEFINE_WAIT(__wait);
+	unsigned long flags;
+	int rc;
+
+	IO("READ on ept %p\n", ept);
+
+	if (ept->flags & MSM_RPC_UNINTERRUPTIBLE) {
+		if (timeout < 0) {
+			wait_event(ept->wait_q, ept_packet_available(ept));
+		} else {
+			rc = wait_event_timeout(
+				ept->wait_q, ept_packet_available(ept),
+				timeout);
+			if (rc == 0)
+				return -ETIMEDOUT;
+		}
+	} else {
+		if (timeout < 0) {
+			rc = wait_event_interruptible(
+				ept->wait_q, ept_packet_available(ept));
+			if (rc < 0)
+				return rc;
+		} else {
+			rc = wait_event_interruptible_timeout(
+				ept->wait_q, ept_packet_available(ept),
+				timeout);
+			if (rc == 0)
+				return -ETIMEDOUT;
+		}
+	}
+
+	spin_lock_irqsave(&ept->read_q_lock, flags);
+	if (list_empty(&ept->read_q)) {
+		spin_unlock_irqrestore(&ept->read_q_lock, flags);
+		return -EAGAIN;
+	}
+	pkt = list_first_entry(&ept->read_q, struct rr_packet, list);
+	if (pkt->length > len) {
+		spin_unlock_irqrestore(&ept->read_q_lock, flags);
+		return -ETOOSMALL;
+	}
+	list_del(&pkt->list);
+	if (list_empty(&ept->read_q))
+		wake_unlock(&ept->read_q_wake_lock);
+	spin_unlock_irqrestore(&ept->read_q_lock, flags);
+
+	rc = pkt->length;
+
+	*frag_ret = pkt->first;
+	rq = (void*) pkt->first->data;
+	if ((rc >= (sizeof(uint32_t) * 3)) && (rq->type == 0)) {
+		IO("READ on ept %p is a CALL on %08x:%08x proc %d xid %d\n",
+			ept, be32_to_cpu(rq->prog), be32_to_cpu(rq->vers),
+			be32_to_cpu(rq->procedure),
+			be32_to_cpu(rq->xid));
+		/* RPC CALL */
+		if (ept->reply_pid != 0xffffffff) {
+			printk(KERN_WARNING
+			       "rr_read: lost previous reply xid...\n");
+		}
+		/* TODO: locking? */
+		ept->reply_pid = pkt->hdr.src_pid;
+		ept->reply_cid = pkt->hdr.src_cid;
+		ept->reply_xid = rq->xid;
+	}
+#if TRACE_RPC_MSG
+	else if ((rc >= (sizeof(uint32_t) * 3)) && (rq->type == 1))
+		IO("READ on ept %p is a REPLY\n", ept);
+	else IO("READ on ept %p (%d bytes)\n", ept, rc);
+#endif
+
+	kfree(pkt);
+	return rc;
+}
+
+#if CONFIG_MSM_AMSS_VERSION >= 6350
+int msm_rpc_is_compatible_version(uint32_t server_version,
+				  uint32_t client_version)
+{
+	if ((server_version & RPC_VERSION_MODE_MASK) !=
+	    (client_version & RPC_VERSION_MODE_MASK))
+		return 0;
+
+	if (server_version & RPC_VERSION_MODE_MASK)
+		return server_version == client_version;
+
+	return ((server_version & RPC_VERSION_MAJOR_MASK) ==
+		(client_version & RPC_VERSION_MAJOR_MASK)) &&
+		((server_version & RPC_VERSION_MINOR_MASK) >=
+		(client_version & RPC_VERSION_MINOR_MASK));
+}
+EXPORT_SYMBOL(msm_rpc_is_compatible_version);
+
+static int msm_rpc_get_compatible_server(uint32_t prog,
+					uint32_t ver,
+					uint32_t *found_vers)
+{
+	struct rr_server *server;
+	unsigned long     flags;
+	if (found_vers == NULL)
+		return 0;
+
+	spin_lock_irqsave(&server_list_lock, flags);
+	list_for_each_entry(server, &server_list, list) {
+		if ((server->prog == prog) &&
+		    msm_rpc_is_compatible_version(server->vers, ver)) {
+			*found_vers = server->vers;
+			spin_unlock_irqrestore(&server_list_lock, flags);
+			return 0;
+		}
+	}
+	spin_unlock_irqrestore(&server_list_lock, flags);
+	return -1;
+}
+#endif
+
+struct msm_rpc_endpoint *msm_rpc_connect(uint32_t prog, uint32_t vers, unsigned flags)
+{
+	struct msm_rpc_endpoint *ept;
+	struct rr_server *server;
+
+#if CONFIG_MSM_AMSS_VERSION >= 6350
+	if (!(vers & RPC_VERSION_MODE_MASK)) {
+		uint32_t found_vers;
+		if (msm_rpc_get_compatible_server(prog, vers, &found_vers) < 0)
+			return ERR_PTR(-EHOSTUNREACH);
+		if (found_vers != vers) {
+			D("RPC using new version %08x:{%08x --> %08x}\n",
+			 	prog, vers, found_vers);
+			vers = found_vers;
+		}
+	}
+#endif
+
+	server = rpcrouter_lookup_server(prog, vers);
+	if (!server)
+		return ERR_PTR(-EHOSTUNREACH);
+
+	ept = msm_rpc_open();
+	if (IS_ERR(ept))
+		return ept;
+
+	ept->flags = flags;
+	ept->dst_pid = server->pid;
+	ept->dst_cid = server->cid;
+	ept->dst_prog = cpu_to_be32(prog);
+	ept->dst_vers = cpu_to_be32(vers);
+
+	return ept;
+}
+EXPORT_SYMBOL(msm_rpc_connect);
+
+uint32_t msm_rpc_get_vers(struct msm_rpc_endpoint *ept)
+{
+	return be32_to_cpu(ept->dst_vers);
+}
+EXPORT_SYMBOL(msm_rpc_get_vers);
+
+/* TODO: permission check? */
+int msm_rpc_register_server(struct msm_rpc_endpoint *ept,
+			    uint32_t prog, uint32_t vers)
+{
+	int rc;
+	union rr_control_msg msg;
+	struct rr_server *server;
+
+	server = rpcrouter_create_server(ept->pid, ept->cid,
+					 prog, vers);
+	if (!server)
+		return -ENODEV;
+
+	msg.srv.cmd = RPCROUTER_CTRL_CMD_NEW_SERVER;
+	msg.srv.pid = ept->pid;
+	msg.srv.cid = ept->cid;
+	msg.srv.prog = prog;
+	msg.srv.vers = vers;
+
+	RR("x NEW_SERVER id=%d:%08x prog=%08x:%08x\n",
+	   ept->pid, ept->cid, prog, vers);
+
+	rc = rpcrouter_send_control_msg(&msg);
+	if (rc < 0)
+		return rc;
+
+	return 0;
+}
+
+/* TODO: permission check -- disallow unreg of somebody else's server */
+int msm_rpc_unregister_server(struct msm_rpc_endpoint *ept,
+			      uint32_t prog, uint32_t vers)
+{
+	struct rr_server *server;
+	server = rpcrouter_lookup_server(prog, vers);
+
+	if (!server)
+		return -ENOENT;
+	rpcrouter_destroy_server(server);
+	return 0;
+}
+
+static int msm_rpcrouter_probe(struct platform_device *pdev)
+{
+	int rc;
+
+	/* Initialize what we need to start processing */
+	INIT_LIST_HEAD(&local_endpoints);
+	INIT_LIST_HEAD(&remote_endpoints);
+
+	init_waitqueue_head(&newserver_wait);
+	init_waitqueue_head(&smd_wait);
+	wake_lock_init(&rpcrouter_wake_lock, WAKE_LOCK_SUSPEND, "SMD_RPCCALL");
+
+	rpcrouter_workqueue = create_singlethread_workqueue("rpcrouter");
+	if (!rpcrouter_workqueue)
+		return -ENOMEM;
+
+	rc = msm_rpcrouter_init_devices();
+	if (rc < 0)
+		goto fail_destroy_workqueue;
+
+	/* Open up SMD channel 2 */
+	initialized = 0;
+	rc = smd_open("SMD_RPCCALL", &smd_channel, NULL, rpcrouter_smdnotify);
+	if (rc < 0)
+		goto fail_remove_devices;
+
+	queue_work(rpcrouter_workqueue, &work_read_data);
+	return 0;
+
+ fail_remove_devices:
+	msm_rpcrouter_exit_devices();
+ fail_destroy_workqueue:
+	destroy_workqueue(rpcrouter_workqueue);
+	return rc;
+}
+
+static struct platform_driver msm_smd_channel2_driver = {
+	.probe		= msm_rpcrouter_probe,
+	.driver		= {
+			.name	= "SMD_RPCCALL",
+			.owner	= THIS_MODULE,
+	},
+};
+
+static int __init rpcrouter_init(void)
+{
+	return platform_driver_register(&msm_smd_channel2_driver);
+}
+
+module_init(rpcrouter_init);
+MODULE_DESCRIPTION("MSM RPC Router");
+MODULE_AUTHOR("San Mehat <san@android.com>");
+MODULE_LICENSE("GPL");

drivers/staging/dream/smd/smd_rpcrouter.h

@@ -0,0 +1,195 @@
+/** arch/arm/mach-msm/smd_rpcrouter.h
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2007-2008 QUALCOMM Incorporated.
+ * Author: San Mehat <san@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _ARCH_ARM_MACH_MSM_SMD_RPCROUTER_H
+#define _ARCH_ARM_MACH_MSM_SMD_RPCROUTER_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/cdev.h>
+#include <linux/platform_device.h>
+#include <linux/wakelock.h>
+
+#include <mach/msm_smd.h>
+#include <mach/msm_rpcrouter.h>
+
+/* definitions for the R2R wire protcol */
+
+#define RPCROUTER_VERSION			1
+#define RPCROUTER_PROCESSORS_MAX		4
+#define RPCROUTER_MSGSIZE_MAX			512
+
+#define RPCROUTER_CLIENT_BCAST_ID		0xffffffff
+#define RPCROUTER_ROUTER_ADDRESS		0xfffffffe
+
+#define RPCROUTER_PID_LOCAL			1
+#define RPCROUTER_PID_REMOTE			0
+
+#define RPCROUTER_CTRL_CMD_DATA			1
+#define RPCROUTER_CTRL_CMD_HELLO		2
+#define RPCROUTER_CTRL_CMD_BYE			3
+#define RPCROUTER_CTRL_CMD_NEW_SERVER		4
+#define RPCROUTER_CTRL_CMD_REMOVE_SERVER	5
+#define RPCROUTER_CTRL_CMD_REMOVE_CLIENT	6
+#define RPCROUTER_CTRL_CMD_RESUME_TX		7
+#define RPCROUTER_CTRL_CMD_EXIT			8
+
+#define RPCROUTER_DEFAULT_RX_QUOTA	5
+
+union rr_control_msg {
+	uint32_t cmd;
+	struct {
+		uint32_t cmd;
+		uint32_t prog;
+		uint32_t vers;
+		uint32_t pid;
+		uint32_t cid;
+	} srv;
+	struct {
+		uint32_t cmd;
+		uint32_t pid;
+		uint32_t cid;
+	} cli;
+};
+
+struct rr_header {
+	uint32_t version;
+	uint32_t type;
+	uint32_t src_pid;
+	uint32_t src_cid;
+	uint32_t confirm_rx;
+	uint32_t size;
+	uint32_t dst_pid;
+	uint32_t dst_cid;
+};
+
+/* internals */
+
+#define RPCROUTER_MAX_REMOTE_SERVERS		100
+
+struct rr_fragment {
+	unsigned char data[RPCROUTER_MSGSIZE_MAX];
+	uint32_t length;
+	struct rr_fragment *next;
+};
+
+struct rr_packet {
+	struct list_head list;
+	struct rr_fragment *first;
+	struct rr_fragment *last;
+	struct rr_header hdr;
+	uint32_t mid;
+	uint32_t length;
+};
+
+#define PACMARK_LAST(n) ((n) & 0x80000000)
+#define PACMARK_MID(n)  (((n) >> 16) & 0xFF)
+#define PACMARK_LEN(n)  ((n) & 0xFFFF)
+
+static inline uint32_t PACMARK(uint32_t len, uint32_t mid, uint32_t first,
+			       uint32_t last)
+{
+	return (len & 0xFFFF) |
+	  ((mid & 0xFF) << 16) |
+	  ((!!first) << 30) |
+	  ((!!last) << 31);
+}
+
+struct rr_server {
+	struct list_head list;
+
+	uint32_t pid;
+	uint32_t cid;
+	uint32_t prog;
+	uint32_t vers;
+
+	dev_t device_number;
+	struct cdev cdev;
+	struct device *device;
+	struct rpcsvr_platform_device p_device;
+	char pdev_name[32];
+};
+
+struct rr_remote_endpoint {
+	uint32_t pid;
+	uint32_t cid;
+
+	int tx_quota_cntr;
+	spinlock_t quota_lock;
+	wait_queue_head_t quota_wait;
+
+	struct list_head list;
+};
+
+struct msm_rpc_endpoint {
+	struct list_head list;
+
+	/* incomplete packets waiting for assembly */
+	struct list_head incomplete;
+
+	/* complete packets waiting to be read */
+	struct list_head read_q;
+	spinlock_t read_q_lock;
+	struct wake_lock read_q_wake_lock;
+	wait_queue_head_t wait_q;
+	unsigned flags;
+
+	/* endpoint address */
+	uint32_t pid;
+	uint32_t cid;
+
+	/* bound remote address
+	 * if not connected (dst_pid == 0xffffffff) RPC_CALL writes fail
+	 * RPC_CALLs must be to the prog/vers below or they will fail
+	 */
+	uint32_t dst_pid;
+	uint32_t dst_cid;
+	uint32_t dst_prog; /* be32 */
+	uint32_t dst_vers; /* be32 */
+
+	/* reply remote address
+	 * if reply_pid == 0xffffffff, none available
+	 * RPC_REPLY writes may only go to the pid/cid/xid of the
+	 * last RPC_CALL we received.
+	 */
+	uint32_t reply_pid;
+	uint32_t reply_cid;
+	uint32_t reply_xid; /* be32 */
+	uint32_t next_pm;   /* Pacmark sequence */
+
+	/* device node if this endpoint is accessed via userspace */
+	dev_t dev;
+};
+
+/* shared between smd_rpcrouter*.c */
+
+int __msm_rpc_read(struct msm_rpc_endpoint *ept,
+		   struct rr_fragment **frag,
+		   unsigned len, long timeout);
+
+struct msm_rpc_endpoint *msm_rpcrouter_create_local_endpoint(dev_t dev);
+int msm_rpcrouter_destroy_local_endpoint(struct msm_rpc_endpoint *ept);
+
+int msm_rpcrouter_create_server_cdev(struct rr_server *server);
+int msm_rpcrouter_create_server_pdev(struct rr_server *server);
+
+int msm_rpcrouter_init_devices(void);
+void msm_rpcrouter_exit_devices(void);
+
+extern dev_t msm_rpcrouter_devno;
+extern struct class *msm_rpcrouter_class;
+#endif

drivers/staging/dream/smd/smd_rpcrouter_device.c

@@ -0,0 +1,376 @@
+/* arch/arm/mach-msm/smd_rpcrouter_device.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2007-2009 QUALCOMM Incorporated.
+ * Author: San Mehat <san@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/cdev.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/err.h>
+#include <linux/sched.h>
+#include <linux/poll.h>
+#include <linux/platform_device.h>
+#include <linux/msm_rpcrouter.h>
+
+#include <asm/uaccess.h>
+#include <asm/byteorder.h>
+
+#include "smd_rpcrouter.h"
+
+#define SAFETY_MEM_SIZE 65536
+
+/* Next minor # available for a remote server */
+static int next_minor = 1;
+
+struct class *msm_rpcrouter_class;
+dev_t msm_rpcrouter_devno;
+
+static struct cdev rpcrouter_cdev;
+static struct device *rpcrouter_device;
+
+static int rpcrouter_open(struct inode *inode, struct file *filp)
+{
+	int rc;
+	struct msm_rpc_endpoint *ept;
+
+	rc = nonseekable_open(inode, filp);
+	if (rc < 0)
+		return rc;
+
+	ept = msm_rpcrouter_create_local_endpoint(inode->i_rdev);
+	if (!ept)
+		return -ENOMEM;
+
+	filp->private_data = ept;
+	return 0;
+}
+
+static int rpcrouter_release(struct inode *inode, struct file *filp)
+{
+	struct msm_rpc_endpoint *ept;
+	ept = (struct msm_rpc_endpoint *) filp->private_data;
+
+	return msm_rpcrouter_destroy_local_endpoint(ept);
+}
+
+static ssize_t rpcrouter_read(struct file *filp, char __user *buf,
+			      size_t count, loff_t *ppos)
+{
+	struct msm_rpc_endpoint *ept;
+	struct rr_fragment *frag, *next;
+	int rc;
+
+	ept = (struct msm_rpc_endpoint *) filp->private_data;
+
+	rc = __msm_rpc_read(ept, &frag, count, -1);
+	if (rc < 0)
+		return rc;
+
+	count = rc;
+
+	while (frag != NULL) {
+		if (copy_to_user(buf, frag->data, frag->length)) {
+			printk(KERN_ERR
+			       "rpcrouter: could not copy all read data to user!\n");
+			rc = -EFAULT;
+		}
+		buf += frag->length;
+		next = frag->next;
+		kfree(frag);
+		frag = next;
+	}
+
+	return rc;
+}
+
+static ssize_t rpcrouter_write(struct file *filp, const char __user *buf,
+				size_t count, loff_t *ppos)
+{
+	struct msm_rpc_endpoint	*ept;
+	int rc = 0;
+	void *k_buffer;
+
+	ept = (struct msm_rpc_endpoint *) filp->private_data;
+
+	/* A check for safety, this seems non-standard */
+	if (count > SAFETY_MEM_SIZE)
+		return -EINVAL;
+
+	k_buffer = kmalloc(count, GFP_KERNEL);
+	if (!k_buffer)
+		return -ENOMEM;
+
+	if (copy_from_user(k_buffer, buf, count)) {
+		rc = -EFAULT;
+		goto write_out_free;
+	}
+
+	rc = msm_rpc_write(ept, k_buffer, count);
+	if (rc < 0)
+		goto write_out_free;
+
+	rc = count;
+write_out_free:
+	kfree(k_buffer);
+	return rc;
+}
+
+static unsigned int rpcrouter_poll(struct file *filp,
+				   struct poll_table_struct *wait)
+{
+	struct msm_rpc_endpoint *ept;
+	unsigned mask = 0;
+	ept = (struct msm_rpc_endpoint *) filp->private_data;
+
+	/* If there's data already in the read queue, return POLLIN.
+	 * Else, wait for the requested amount of time, and check again.
+	 */
+
+	if (!list_empty(&ept->read_q))
+		mask |= POLLIN;
+
+	if (!mask) {
+		poll_wait(filp, &ept->wait_q, wait);
+		if (!list_empty(&ept->read_q))
+			mask |= POLLIN;
+	}
+
+	return mask;
+}
+
+static long rpcrouter_ioctl(struct file *filp, unsigned int cmd,
+			    unsigned long arg)
+{
+	struct msm_rpc_endpoint *ept;
+	struct rpcrouter_ioctl_server_args server_args;
+	int rc = 0;
+	uint32_t n;
+
+	ept = (struct msm_rpc_endpoint *) filp->private_data;
+	switch (cmd) {
+
+	case RPC_ROUTER_IOCTL_GET_VERSION:
+		n = RPC_ROUTER_VERSION_V1;
+		rc = put_user(n, (unsigned int *) arg);
+		break;
+
+	case RPC_ROUTER_IOCTL_GET_MTU:
+		/* the pacmark word reduces the actual payload
+		 * possible per message
+		 */
+		n = RPCROUTER_MSGSIZE_MAX - sizeof(uint32_t);
+		rc = put_user(n, (unsigned int *) arg);
+		break;
+
+	case RPC_ROUTER_IOCTL_REGISTER_SERVER:
+		rc = copy_from_user(&server_args, (void *) arg,
+				    sizeof(server_args));
+		if (rc < 0)
+			break;
+		msm_rpc_register_server(ept,
+					server_args.prog,
+					server_args.vers);
+		break;
+
+	case RPC_ROUTER_IOCTL_UNREGISTER_SERVER:
+		rc = copy_from_user(&server_args, (void *) arg,
+				    sizeof(server_args));
+		if (rc < 0)
+			break;
+
+		msm_rpc_unregister_server(ept,
+					  server_args.prog,
+					  server_args.vers);
+		break;
+
+	case RPC_ROUTER_IOCTL_GET_MINOR_VERSION:
+		n = MSM_RPC_GET_MINOR(msm_rpc_get_vers(ept));
+		rc = put_user(n, (unsigned int *)arg);
+		break;
+
+	default:
+		rc = -EINVAL;
+		break;
+	}
+
+	return rc;
+}
+
+static struct file_operations rpcrouter_server_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = rpcrouter_open,
+	.release = rpcrouter_release,
+	.read	 = rpcrouter_read,
+	.write	 = rpcrouter_write,
+	.poll    = rpcrouter_poll,
+	.unlocked_ioctl	 = rpcrouter_ioctl,
+};
+
+static struct file_operations rpcrouter_router_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = rpcrouter_open,
+	.release = rpcrouter_release,
+	.read	 = rpcrouter_read,
+	.write	 = rpcrouter_write,
+	.poll    = rpcrouter_poll,
+	.unlocked_ioctl = rpcrouter_ioctl,
+};
+
+int msm_rpcrouter_create_server_cdev(struct rr_server *server)
+{
+	int rc;
+	uint32_t dev_vers;
+
+	if (next_minor == RPCROUTER_MAX_REMOTE_SERVERS) {
+		printk(KERN_ERR
+		       "rpcrouter: Minor numbers exhausted - Increase "
+		       "RPCROUTER_MAX_REMOTE_SERVERS\n");
+		return -ENOBUFS;
+	}
+
+#if CONFIG_MSM_AMSS_VERSION >= 6350
+	/* Servers with bit 31 set are remote msm servers with hashkey version.
+	 * Servers with bit 31 not set are remote msm servers with
+	 * backwards compatible version type in which case the minor number
+	 * (lower 16 bits) is set to zero.
+	 *
+	 */
+	if ((server->vers & RPC_VERSION_MODE_MASK))
+		dev_vers = server->vers;
+	else
+		dev_vers = server->vers & RPC_VERSION_MAJOR_MASK;
+#else
+	dev_vers = server->vers;
+#endif
+
+	server->device_number =
+		MKDEV(MAJOR(msm_rpcrouter_devno), next_minor++);
+
+	server->device =
+		device_create(msm_rpcrouter_class, rpcrouter_device,
+			      server->device_number, NULL, "%.8x:%.8x",
+			      server->prog, dev_vers);
+	if (IS_ERR(server->device)) {
+		printk(KERN_ERR
+		       "rpcrouter: Unable to create device (%ld)\n",
+		       PTR_ERR(server->device));
+		return PTR_ERR(server->device);;
+	}
+
+	cdev_init(&server->cdev, &rpcrouter_server_fops);
+	server->cdev.owner = THIS_MODULE;
+
+	rc = cdev_add(&server->cdev, server->device_number, 1);
+	if (rc < 0) {
+		printk(KERN_ERR
+		       "rpcrouter: Unable to add chrdev (%d)\n", rc);
+		device_destroy(msm_rpcrouter_class, server->device_number);
+		return rc;
+	}
+	return 0;
+}
+
+/* for backward compatible version type (31st bit cleared)
+ * clearing minor number (lower 16 bits) in device name
+ * is neccessary for driver binding
+ */
+int msm_rpcrouter_create_server_pdev(struct rr_server *server)
+{
+	sprintf(server->pdev_name, "rs%.8x:%.8x",
+		server->prog,
+#if CONFIG_MSM_AMSS_VERSION >= 6350
+		(server->vers & RPC_VERSION_MODE_MASK) ? server->vers :
+		(server->vers & RPC_VERSION_MAJOR_MASK));
+#else
+		server->vers);
+#endif
+
+	server->p_device.base.id = -1;
+	server->p_device.base.name = server->pdev_name;
+
+	server->p_device.prog = server->prog;
+	server->p_device.vers = server->vers;
+
+	platform_device_register(&server->p_device.base);
+	return 0;
+}
+
+int msm_rpcrouter_init_devices(void)
+{
+	int rc;
+	int major;
+
+	/* Create the device nodes */
+	msm_rpcrouter_class = class_create(THIS_MODULE, "oncrpc");
+	if (IS_ERR(msm_rpcrouter_class)) {
+		rc = -ENOMEM;
+		printk(KERN_ERR
+		       "rpcrouter: failed to create oncrpc class\n");
+		goto fail;
+	}
+
+	rc = alloc_chrdev_region(&msm_rpcrouter_devno, 0,
+				 RPCROUTER_MAX_REMOTE_SERVERS + 1,
+				 "oncrpc");
+	if (rc < 0) {
+		printk(KERN_ERR
+		       "rpcrouter: Failed to alloc chardev region (%d)\n", rc);
+		goto fail_destroy_class;
+	}
+
+	major = MAJOR(msm_rpcrouter_devno);
+	rpcrouter_device = device_create(msm_rpcrouter_class, NULL,
+					 msm_rpcrouter_devno, NULL, "%.8x:%d",
+					 0, 0);
+	if (IS_ERR(rpcrouter_device)) {
+		rc = -ENOMEM;
+		goto fail_unregister_cdev_region;
+	}
+
+	cdev_init(&rpcrouter_cdev, &rpcrouter_router_fops);
+	rpcrouter_cdev.owner = THIS_MODULE;
+
+	rc = cdev_add(&rpcrouter_cdev, msm_rpcrouter_devno, 1);
+	if (rc < 0)
+		goto fail_destroy_device;
+
+	return 0;
+
+fail_destroy_device:
+	device_destroy(msm_rpcrouter_class, msm_rpcrouter_devno);
+fail_unregister_cdev_region:
+	unregister_chrdev_region(msm_rpcrouter_devno,
+				 RPCROUTER_MAX_REMOTE_SERVERS + 1);
+fail_destroy_class:
+	class_destroy(msm_rpcrouter_class);
+fail:
+	return rc;
+}
+
+void msm_rpcrouter_exit_devices(void)
+{
+	cdev_del(&rpcrouter_cdev);
+	device_destroy(msm_rpcrouter_class, msm_rpcrouter_devno);
+	unregister_chrdev_region(msm_rpcrouter_devno,
+				 RPCROUTER_MAX_REMOTE_SERVERS + 1);
+	class_destroy(msm_rpcrouter_class);
+}
+

drivers/staging/dream/smd/smd_rpcrouter_servers.c

@@ -0,0 +1,229 @@
+/* arch/arm/mach-msm/rpc_servers.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Author: Iliyan Malchev <ibm@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/cdev.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/wakelock.h>
+
+#include <linux/msm_rpcrouter.h>
+#include <linux/uaccess.h>
+
+#include <mach/msm_rpcrouter.h>
+#include "smd_rpcrouter.h"
+
+static struct msm_rpc_endpoint *endpoint;
+
+#define FLAG_REGISTERED 0x0001
+
+static LIST_HEAD(rpc_server_list);
+static DEFINE_MUTEX(rpc_server_list_lock);
+static int rpc_servers_active;
+static struct wake_lock rpc_servers_wake_lock;
+
+static void rpc_server_register(struct msm_rpc_server *server)
+{
+	int rc;
+	rc = msm_rpc_register_server(endpoint, server->prog, server->vers);
+	if (rc < 0)
+		printk(KERN_ERR "[rpcserver] error registering %p @ %08x:%d\n",
+		       server, server->prog, server->vers);
+}
+
+static struct msm_rpc_server *rpc_server_find(uint32_t prog, uint32_t vers)
+{
+	struct msm_rpc_server *server;
+
+	mutex_lock(&rpc_server_list_lock);
+	list_for_each_entry(server, &rpc_server_list, list) {
+		if ((server->prog == prog) &&
+#if CONFIG_MSM_AMSS_VERSION >= 6350
+		    msm_rpc_is_compatible_version(server->vers, vers)) {
+#else
+		    server->vers == vers) {
+#endif
+			mutex_unlock(&rpc_server_list_lock);
+			return server;
+		}
+	}
+	mutex_unlock(&rpc_server_list_lock);
+	return NULL;
+}
+
+static void rpc_server_register_all(void)
+{
+	struct msm_rpc_server *server;
+
+	mutex_lock(&rpc_server_list_lock);
+	list_for_each_entry(server, &rpc_server_list, list) {
+		if (!(server->flags & FLAG_REGISTERED)) {
+			rpc_server_register(server);
+			server->flags |= FLAG_REGISTERED;
+		}
+	}
+	mutex_unlock(&rpc_server_list_lock);
+}
+
+int msm_rpc_create_server(struct msm_rpc_server *server)
+{
+	/* make sure we're in a sane state first */
+	server->flags = 0;
+	INIT_LIST_HEAD(&server->list);
+
+	mutex_lock(&rpc_server_list_lock);
+	list_add(&server->list, &rpc_server_list);
+	if (rpc_servers_active) {
+		rpc_server_register(server);
+		server->flags |= FLAG_REGISTERED;
+	}
+	mutex_unlock(&rpc_server_list_lock);
+
+	return 0;
+}
+
+static int rpc_send_accepted_void_reply(struct msm_rpc_endpoint *client,
+					uint32_t xid, uint32_t accept_status)
+{
+	int rc = 0;
+	uint8_t reply_buf[sizeof(struct rpc_reply_hdr)];
+	struct rpc_reply_hdr *reply = (struct rpc_reply_hdr *)reply_buf;
+
+	reply->xid = cpu_to_be32(xid);
+	reply->type = cpu_to_be32(1); /* reply */
+	reply->reply_stat = cpu_to_be32(RPCMSG_REPLYSTAT_ACCEPTED);
+
+	reply->data.acc_hdr.accept_stat = cpu_to_be32(accept_status);
+	reply->data.acc_hdr.verf_flavor = 0;
+	reply->data.acc_hdr.verf_length = 0;
+
+	rc = msm_rpc_write(client, reply_buf, sizeof(reply_buf));
+	if (rc < 0)
+		printk(KERN_ERR
+		       "%s: could not write response: %d\n",
+		       __FUNCTION__, rc);
+
+	return rc;
+}
+
+static int rpc_servers_thread(void *data)
+{
+	void *buffer;
+	struct rpc_request_hdr *req;
+	struct msm_rpc_server *server;
+	int rc;
+
+	for (;;) {
+		wake_unlock(&rpc_servers_wake_lock);
+		rc = wait_event_interruptible(endpoint->wait_q,
+						!list_empty(&endpoint->read_q));
+		wake_lock(&rpc_servers_wake_lock);
+		rc = msm_rpc_read(endpoint, &buffer, -1, -1);
+		if (rc < 0) {
+			printk(KERN_ERR "%s: could not read: %d\n",
+			       __FUNCTION__, rc);
+			break;
+		}
+		req = (struct rpc_request_hdr *)buffer;
+
+		req->type = be32_to_cpu(req->type);
+		req->xid = be32_to_cpu(req->xid);
+		req->rpc_vers = be32_to_cpu(req->rpc_vers);
+		req->prog = be32_to_cpu(req->prog);
+		req->vers = be32_to_cpu(req->vers);
+		req->procedure = be32_to_cpu(req->procedure);
+
+		server = rpc_server_find(req->prog, req->vers);
+
+		if (req->rpc_vers != 2)
+			continue;
+		if (req->type != 0)
+			continue;
+		if (!server) {
+			rpc_send_accepted_void_reply(
+				endpoint, req->xid,
+				RPC_ACCEPTSTAT_PROG_UNAVAIL);
+			continue;
+		}
+
+		rc = server->rpc_call(server, req, rc);
+
+		switch (rc) {
+		case 0:
+			rpc_send_accepted_void_reply(
+				endpoint, req->xid,
+				RPC_ACCEPTSTAT_SUCCESS);
+			break;
+		default:
+			rpc_send_accepted_void_reply(
+				endpoint, req->xid,
+				RPC_ACCEPTSTAT_PROG_UNAVAIL);
+			break;
+		}
+
+		kfree(buffer);
+	}
+
+	do_exit(0);
+}
+
+static int rpcservers_probe(struct platform_device *pdev)
+{
+	struct task_struct *server_thread;
+
+	endpoint = msm_rpc_open();
+	if (IS_ERR(endpoint))
+		return PTR_ERR(endpoint);
+
+	/* we're online -- register any servers installed beforehand */
+	rpc_servers_active = 1;
+	rpc_server_register_all();
+
+	/* start the kernel thread */
+	server_thread = kthread_run(rpc_servers_thread, NULL, "krpcserversd");
+	if (IS_ERR(server_thread))
+		return PTR_ERR(server_thread);
+
+	return 0;
+}
+
+static struct platform_driver rpcservers_driver = {
+	.probe	= rpcservers_probe,
+	.driver	= {
+		.name	= "oncrpc_router",
+		.owner	= THIS_MODULE,
+	},
+};
+
+static int __init rpc_servers_init(void)
+{
+	wake_lock_init(&rpc_servers_wake_lock, WAKE_LOCK_SUSPEND, "rpc_server");
+	return platform_driver_register(&rpcservers_driver);
+}
+
+module_init(rpc_servers_init);
+
+MODULE_DESCRIPTION("MSM RPC Servers");
+MODULE_AUTHOR("Iliyan Malchev <ibm@android.com>");
+MODULE_LICENSE("GPL");