[PATCH 1/5] msm: rpc: shared memory rpc router
Niranjana Vishwanathapura
nvishwan at codeaurora.org
Wed Dec 15 13:54:06 EST 2010
The RPC router provides access to the RPC services running on
the baseband core from kernel.
Cc: San Mehat <san at android.com>
Signed-off-by: Niranjana Vishwanathapura <nvishwan at codeaurora.org>
---
drivers/misc/Kconfig | 8 +
drivers/misc/Makefile | 1 +
drivers/misc/msm_rpcrouter.h | 151 +++++
drivers/misc/msm_smd_rpcrouter.c | 1255 ++++++++++++++++++++++++++++++++++++++
drivers/misc/msm_smd_rpcrouter.h | 184 ++++++
5 files changed, 1599 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/msm_rpcrouter.h
create mode 100644 drivers/misc/msm_smd_rpcrouter.c
create mode 100644 drivers/misc/msm_smd_rpcrouter.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 4d073f1..651836d 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -452,6 +452,14 @@ config PCH_PHUB
To compile this driver as a module, choose M here: the module will
be called pch_phub.
+config MSM_ONCRPCROUTER
+ depends on MSM_SMD
+ default n
+ bool "MSM ONCRPC router support"
+ help
+ Support for the MSM ONCRPC router for rpc communitation with
+ baseband processor.
+
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 98009cc..3bb65b1 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -42,3 +42,4 @@ obj-$(CONFIG_ARM_CHARLCD) += arm-charlcd.o
obj-$(CONFIG_PCH_PHUB) += pch_phub.o
obj-y += ti-st/
obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o
+obj-$(CONFIG_MSM_ONCRPCROUTER) += msm_smd_rpcrouter.o
diff --git a/drivers/misc/msm_rpcrouter.h b/drivers/misc/msm_rpcrouter.h
new file mode 100644
index 0000000..935e714
--- /dev/null
+++ b/drivers/misc/msm_rpcrouter.h
@@ -0,0 +1,151 @@
+/** drivers/misc/msm_rpcrouter.h
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ * Author: San Mehat <san at 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 _MSM_RPCROUTER_H
+#define _MSM_RPCROUTER_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/platform_device.h>
+
+/* RPC API version structure
+ * Version bit 31 : 1->hashkey versioning,
+ * 0->major-minor (backward compatible) versioning
+ * hashkey versioning:
+ * Version bits 31-0 hashkey
+ * major-minor (backward compatible) versioning
+ * Version bits 30-28 reserved (no match)
+ * Version bits 27-16 major (must match)
+ * Version bits 15-0 minor (greater or equal)
+ */
+#define RPC_VERSION_MODE_MASK 0x80000000
+#define RPC_VERSION_MAJOR_MASK 0x0fff0000
+#define RPC_VERSION_MAJOR_OFFSET 16
+#define RPC_VERSION_MINOR_MASK 0x0000ffff
+
+#define MSM_RPC_VERS(major, minor) \
+ ((uint32_t)((((major) << RPC_VERSION_MAJOR_OFFSET) & \
+ RPC_VERSION_MAJOR_MASK) | \
+ ((minor) & RPC_VERSION_MINOR_MASK)))
+#define MSM_RPC_GET_MAJOR(vers) (((vers) & RPC_VERSION_MAJOR_MASK) >> \
+ RPC_VERSION_MAJOR_OFFSET)
+#define MSM_RPC_GET_MINOR(vers) ((vers) & RPC_VERSION_MINOR_MASK)
+
+struct msm_rpc_endpoint;
+
+struct rpcsvr_platform_device {
+ struct platform_device base;
+ uint32_t prog;
+ uint32_t vers;
+};
+
+#define RPC_DATA_IN 0
+/*
+ * Structures for sending / receiving direct RPC requests
+ * XXX: Any cred/verif lengths > 0 not supported
+ */
+
+struct rpc_request_hdr {
+ uint32_t xid;
+ uint32_t type; /* 0 */
+ uint32_t rpc_vers; /* 2 */
+ uint32_t prog;
+ uint32_t vers;
+ uint32_t procedure;
+ uint32_t cred_flavor;
+ uint32_t cred_length;
+ uint32_t verf_flavor;
+ uint32_t verf_length;
+};
+
+struct rpc_reply_progmismatch_data {
+ uint32_t low;
+ uint32_t high;
+};
+
+struct rpc_denied_reply_hdr {
+};
+
+struct rpc_accepted_reply_hdr {
+ uint32_t verf_flavor;
+ uint32_t verf_length;
+ uint32_t accept_stat;
+#define RPC_ACCEPTSTAT_SUCCESS 0
+#define RPC_ACCEPTSTAT_PROG_UNAVAIL 1
+#define RPC_ACCEPTSTAT_PROG_MISMATCH 2
+#define RPC_ACCEPTSTAT_PROC_UNAVAIL 3
+#define RPC_ACCEPTSTAT_GARBAGE_ARGS 4
+#define RPC_ACCEPTSTAT_SYSTEM_ERR 5
+#define RPC_ACCEPTSTAT_PROG_LOCKED 6
+ /*
+ * Following data is dependant on accept_stat
+ * If ACCEPTSTAT == PROG_MISMATCH then there is a
+ * 'rpc_reply_progmismatch_data' structure following the header.
+ * Otherwise the data is procedure specific
+ */
+};
+
+struct rpc_reply_hdr {
+ uint32_t xid;
+ uint32_t type;
+ uint32_t reply_stat;
+#define RPCMSG_REPLYSTAT_ACCEPTED 0
+#define RPCMSG_REPLYSTAT_DENIED 1
+ union {
+ struct rpc_accepted_reply_hdr acc_hdr;
+ struct rpc_denied_reply_hdr dny_hdr;
+ } data;
+};
+
+/* flags for msm_rpc_connect() */
+#define MSM_RPC_UNINTERRUPTIBLE 0x0001
+#define MSM_RPC_ENABLE_RECEIVE (0x10000)
+
+/* use IS_ERR() to check for failure */
+struct msm_rpc_endpoint *msm_rpc_open(void);
+/* Connect with the specified server version */
+struct msm_rpc_endpoint *msm_rpc_connect(uint32_t prog, uint32_t vers,
+ unsigned flags);
+uint32_t msm_rpc_get_vers(struct msm_rpc_endpoint *ept);
+/* check if server version can handle client requested version */
+int msm_rpc_is_compatible_version(uint32_t server_version,
+ uint32_t client_version);
+
+int msm_rpc_close(struct msm_rpc_endpoint *ept);
+int msm_rpc_write(struct msm_rpc_endpoint *ept,
+ void *data, int len);
+int msm_rpc_read(struct msm_rpc_endpoint *ept,
+ void **data, unsigned len, long timeout);
+void msm_rpc_setup_req(struct rpc_request_hdr *hdr,
+ uint32_t prog, uint32_t vers, uint32_t proc);
+
+/* simple blocking rpc call
+ *
+ * request is mandatory and must have a rpc_request_hdr
+ * at the start. The header will be filled out for you.
+ *
+ * reply provides a buffer for replies of reply_max_size
+ */
+int msm_rpc_call_reply(struct msm_rpc_endpoint *ept, uint32_t proc,
+ void *request, int request_size,
+ void *reply, int reply_max_size,
+ long timeout);
+int msm_rpc_call(struct msm_rpc_endpoint *ept, uint32_t proc,
+ void *request, int request_size,
+ long timeout);
+
+#endif /* _MSM_RPCROUTER_H */
diff --git a/drivers/misc/msm_smd_rpcrouter.c b/drivers/misc/msm_smd_rpcrouter.c
new file mode 100644
index 0000000..c0aed22
--- /dev/null
+++ b/drivers/misc/msm_smd_rpcrouter.c
@@ -0,0 +1,1255 @@
+/* drivers/misc/msm_smd_rpcrouter.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ * Author: San Mehat <san at 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/slab.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/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 "msm_smd_rpcrouter.h"
+
+#define TRACE_R2R_MSG 0
+#define TRACE_RPC_MSG 0
+#define MSM_RPCROUTER_DEBUG 0
+
+/* Diagnostic messages */
+#define DIAG(x...) printk(KERN_DEBUG "[RR] ERROR " x)
+
+/* Debug messages */
+#if MSM_RPCROUTER_DEBUG
+#define D(x...) printk(KERN_DEBUG x)
+#else
+#define D(x...) do {} while (0)
+#endif
+
+/* Router-to-Router messages */
+#if TRACE_R2R_MSG
+#define RR(x...) printk(KERN_DEBUG "[RR] "x)
+#else
+#define RR(x...) do {} while (0)
+#endif
+
+/* RPC Read/Write (IO) messages */
+#if TRACE_RPC_MSG
+#define IO(x...) printk(KERN_DEBUG "[RPC] "x)
+#else
+#define IO(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 int rpcrouter_need_len;
+
+static atomic_t next_xid = ATOMIC_INIT(1);
+static atomic_t next_mid = ATOMIC_INIT(0);
+
+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);
+
+static struct platform_device rpcrouter_pdev = {
+ .name = "oncrpc_router",
+ .id = -1,
+};
+
+static int __msm_rpc_read(struct msm_rpc_endpoint *ept,
+ struct rr_fragment **frag,
+ unsigned len, long timeout);
+
+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;
+
+ server = kzalloc(sizeof(struct rr_server), GFP_KERNEL);
+ if (!server)
+ return ERR_PTR(-ENOMEM);
+
+ 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);
+
+ return server;
+}
+
+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);
+ 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;
+ int i;
+
+ 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->next_rroute = 0;
+ spin_lock_init(&ept->rroute_lock);
+ for (i = 0; i < MAX_REPLY_ROUTE; i++)
+ ept->rroute[i].pid = 0xffffffff;
+
+ ept->cid = (uint32_t) ept;
+ ept->pid = RPCROUTER_PID_LOCAL;
+ ept->dev = dev;
+
+ if (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);
+ ept->flags |= MSM_RPC_ENABLE_RECEIVE;
+
+ 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);
+ 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;
+
+ 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);
+}
+
+/* for backward compatible version type (31st bit cleared)
+ * clearing minor number (lower 16 bits) in device name
+ * is neccessary for driver binding
+ */
+static int msm_rpcrouter_create_server_pdev(struct rr_server *server)
+{
+ sprintf(server->pdev_name, "rs%.8x:%.8x",
+ server->prog,
+ (server->vers & RPC_VERSION_MODE_MASK) ? server->vers :
+ (server->vers & RPC_VERSION_MAJOR_MASK));
+
+ 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;
+}
+
+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_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 {
+ msleep(100);
+ 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;
+
+ 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;
+ spin_unlock_irqrestore(&smd_lock, flags);
+
+ do {
+ rc = wait_event_interruptible(smd_wait,
+ smd_read_avail(smd_channel) >= len);
+ } while (rc < 0);
+ }
+ 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;
+
+ 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);
+
+ 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);
+ if (ept->flags & MSM_RPC_ENABLE_RECEIVE) {
+ list_add_tail(&pkt->list, &ept->read_q);
+ wake_up(&ept->wait_q);
+ } else {
+ pr_warning("smd_rpcrouter: Unexpected incoming data on %08x:%08x\n",
+ be32_to_cpu(ept->dst_prog),
+ be32_to_cpu(ept->dst_vers));
+ }
+ 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");
+}
+
+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);
+
+static int msm_rpc_write_pkt(struct msm_rpc_endpoint *ept,
+ struct rr_remote_endpoint *r_ept,
+ struct rr_header *hdr,
+ uint32_t pacmark,
+ void *buffer, int count)
+{
+ DEFINE_WAIT(__wait);
+ unsigned long flags;
+ int needed;
+
+ 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;
+
+ 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 0;
+}
+
+int msm_rpc_write(struct msm_rpc_endpoint *ept, void *buffer, int count)
+{
+ struct rr_header hdr;
+ uint32_t pacmark;
+ uint32_t mid;
+ struct rpc_request_hdr *rq = buffer;
+ struct rr_remote_endpoint *r_ept;
+ unsigned long flags;
+ int ret;
+ int total;
+
+ /* 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 ((ept->dst_prog != rq->prog) ||
+ !msm_rpc_is_compatible_version(
+ be32_to_cpu(ept->dst_vers),
+ be32_to_cpu(rq->vers))) {
+ 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 */
+ spin_lock_irqsave(&ept->rroute_lock, flags);
+ for (ret = 0; ret < MAX_REPLY_ROUTE; ret++)
+ if (ept->rroute[ret].xid == rq->xid) {
+ if (ept->rroute[ret].pid == 0xffffffff)
+ continue;
+ hdr.dst_pid = ept->rroute[ret].pid;
+ hdr.dst_cid = ept->rroute[ret].cid;
+ /* consume this reply */
+ ept->rroute[ret].pid = 0xffffffff;
+ spin_unlock_irqrestore(&ept->rroute_lock,
+ flags);
+ goto found_rroute;
+ }
+
+ spin_unlock_irqrestore(&ept->rroute_lock, flags);
+ printk(KERN_ERR "rr_write: rejecting packet w/ bad xid\n");
+ return -EINVAL;
+
+found_rroute:
+ 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;
+
+ total = count;
+
+ mid = atomic_add_return(1, &next_mid) & 0xFF;
+
+ while (count > 0) {
+ unsigned xfer;
+
+ if (count > RPCROUTER_DATASIZE_MAX)
+ xfer = RPCROUTER_DATASIZE_MAX;
+ else
+ xfer = count;
+
+ hdr.confirm_rx = 0;
+ hdr.size = xfer + sizeof(uint32_t);
+
+ /* total == count -> must be first packet
+ * xfer == count -> must be last packet
+ */
+ pacmark = PACMARK(xfer, mid, (total == count), (xfer == count));
+
+ ret = msm_rpc_write_pkt(ept, r_ept, &hdr,
+ pacmark, buffer, xfer);
+ if (ret < 0)
+ return ret;
+
+ buffer += xfer;
+ count -= xfer;
+ }
+
+ return total;
+}
+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);
+
+ /* Allow replys to be added to the queue */
+ ept->flags |= MSM_RPC_ENABLE_RECEIVE;
+
+ rc = msm_rpc_write(ept, req, request_size);
+ if (rc < 0)
+ goto error;
+
+ for (;;) {
+ rc = msm_rpc_read(ept, (void *) &reply, -1, timeout);
+ if (rc < 0)
+ goto error;
+ 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);
+error:
+ ept->flags &= ~MSM_RPC_ENABLE_RECEIVE;
+ 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;
+}
+
+static 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;
+ else if (rc < 0)
+ return rc;
+ }
+ }
+
+ 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);
+ 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 */
+ spin_lock_irqsave(&ept->rroute_lock, flags);
+ if (ept->rroute[ept->next_rroute].pid != 0xffffffff) {
+ printk(KERN_WARNING
+ "rr_read: lost previous reply xid...\n");
+ }
+ ept->rroute[ept->next_rroute].pid = pkt->hdr.src_pid;
+ ept->rroute[ept->next_rroute].cid = pkt->hdr.src_cid;
+ ept->rroute[ept->next_rroute].xid = rq->xid;
+ ept->next_rroute = (ept->next_rroute + 1) &
+ (MAX_REPLY_ROUTE - 1);
+ spin_unlock_irqrestore(&ept->rroute_lock, flags);
+ }
+#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;
+}
+
+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;
+}
+
+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 (!(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;
+ }
+ }
+
+ 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);
+
+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);
+
+ rpcrouter_workqueue = create_singlethread_workqueue("rpcrouter");
+ if (!rpcrouter_workqueue)
+ return -ENOMEM;
+
+ /* Open up SMD channel 2 */
+ initialized = 0;
+ rc = smd_open("SMD_RPCCALL", &smd_channel, NULL, rpcrouter_smdnotify);
+ if (rc < 0)
+ goto fail_destroy_workqueue;
+
+ queue_work(rpcrouter_workqueue, &work_read_data);
+ return 0;
+
+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 at android.com>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/msm_smd_rpcrouter.h b/drivers/misc/msm_smd_rpcrouter.h
new file mode 100644
index 0000000..4d3adeb
--- /dev/null
+++ b/drivers/misc/msm_smd_rpcrouter.h
@@ -0,0 +1,184 @@
+/** drivers/misc/msm_smd_rpcrouter.h
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ * Author: San Mehat <san at 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 _MSM_SMD_RPCROUTER_H
+#define _MSM_SMD_RPCROUTER_H
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/cdev.h>
+#include <linux/platform_device.h>
+
+#include <mach/msm_smd.h>
+#include "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_DATASIZE_MAX 500
+
+#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_reply_route {
+ uint32_t xid;
+ uint32_t pid;
+ uint32_t cid;
+ uint32_t unused;
+};
+
+#define MAX_REPLY_ROUTE 4
+
+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;
+ 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 */
+
+ /* RPC_REPLY writes must be routed to the pid/cid of the
+ * RPC_CALL they are in reply to. Keep a cache of valid
+ * xid/pid/cid groups. pid 0xffffffff -> not valid.
+ */
+ unsigned next_rroute;
+ struct msm_reply_route rroute[MAX_REPLY_ROUTE];
+ spinlock_t rroute_lock;
+
+ /* device node if this endpoint is accessed via userspace */
+ dev_t dev;
+};
+
+#endif /* _MSM_SMD_RPCROUTER_H */
--
1.5.6.3
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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