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Message-Id: <1292439250-11985-4-git-send-email-nvishwan@codeaurora.org>
Date: Wed, 15 Dec 2010 10:54:08 -0800
From: Niranjana Vishwanathapura <nvishwan@...eaurora.org>
To: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Cc: linux-arm-msm@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
Niranjana Vishwanathapura <nvishwan@...eaurora.org>,
San Mehat <san@...roid.com>
Subject: [PATCH 3/5] msm: rpc: Add support for RPC servers
Add support for RPC servers on host processor so that
clients on remote processor can talk to it.
Cc: San Mehat <san@...roid.com>
Signed-off-by: Niranjana Vishwanathapura <nvishwan@...eaurora.org>
---
drivers/misc/Makefile | 1 +
drivers/misc/msm_rpcrouter.h | 17 +++
drivers/misc/msm_smd_rpcrouter.c | 43 ++++++
drivers/misc/msm_smd_rpcrouter_servers.c | 221 ++++++++++++++++++++++++++++++
4 files changed, 282 insertions(+), 0 deletions(-)
create mode 100644 drivers/misc/msm_smd_rpcrouter_servers.c
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index d7a00e4..8f1dbf4 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -44,3 +44,4 @@ obj-y += ti-st/
obj-$(CONFIG_AB8500_PWM) += ab8500-pwm.o
obj-$(CONFIG_MSM_ONCRPCROUTER) += msm_smd_rpcrouter.o
obj-$(CONFIG_MSM_ONCRPCROUTER) += msm_smd_rpcrouter_device.o
+obj-$(CONFIG_MSM_ONCRPCROUTER) += msm_smd_rpcrouter_servers.o
diff --git a/drivers/misc/msm_rpcrouter.h b/drivers/misc/msm_rpcrouter.h
index 935e714..2c83a74 100644
--- a/drivers/misc/msm_rpcrouter.h
+++ b/drivers/misc/msm_rpcrouter.h
@@ -132,6 +132,10 @@ 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);
+int msm_rpc_register_server(struct msm_rpc_endpoint *ept,
+ uint32_t prog, uint32_t vers);
+int msm_rpc_unregister_server(struct msm_rpc_endpoint *ept,
+ uint32_t prog, uint32_t vers);
/* simple blocking rpc call
*
@@ -148,4 +152,17 @@ int msm_rpc_call(struct msm_rpc_endpoint *ept, uint32_t proc,
void *request, int request_size,
long timeout);
+struct msm_rpc_server {
+ struct list_head list;
+ uint32_t flags;
+
+ uint32_t prog;
+ uint32_t vers;
+
+ int (*rpc_call)(struct msm_rpc_server *server,
+ struct rpc_request_hdr *req, unsigned len);
+};
+
+int msm_rpc_create_server(struct msm_rpc_server *server);
+
#endif /* _MSM_RPCROUTER_H */
diff --git a/drivers/misc/msm_smd_rpcrouter.c b/drivers/misc/msm_smd_rpcrouter.c
index eaaf79e..93b0731 100644
--- a/drivers/misc/msm_smd_rpcrouter.c
+++ b/drivers/misc/msm_smd_rpcrouter.c
@@ -1196,6 +1196,49 @@ uint32_t msm_rpc_get_vers(struct msm_rpc_endpoint *ept)
}
EXPORT_SYMBOL(msm_rpc_get_vers);
+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;
+
+ ept->flags |= MSM_RPC_ENABLE_RECEIVE;
+ return 0;
+}
+
+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;
+
+ ept->flags &= ~MSM_RPC_ENABLE_RECEIVE;
+ rpcrouter_destroy_server(server);
+ return 0;
+}
+
static int msm_rpcrouter_probe(struct platform_device *pdev)
{
int rc;
diff --git a/drivers/misc/msm_smd_rpcrouter_servers.c b/drivers/misc/msm_smd_rpcrouter_servers.c
new file mode 100644
index 0000000..f5e10c5
--- /dev/null
+++ b/drivers/misc/msm_smd_rpcrouter_servers.c
@@ -0,0 +1,221 @@
+/* drivers/misc/msm_smd_rpcrouter_servers.c
+ *
+ * Copyright (C) 2007 Google, Inc.
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ * Author: Iliyan Malchev <ibm@...roid.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/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/fs.h>
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <linux/msm_rpcrouter.h>
+#include <linux/uaccess.h>
+
+#include "msm_rpcrouter.h"
+#include "msm_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 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) &&
+ msm_rpc_is_compatible_version(server->vers, vers)) {
+ 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", __func__, 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 (;;) {
+ rc = wait_event_interruptible(endpoint->wait_q,
+ !list_empty(&endpoint->read_q));
+ rc = msm_rpc_read(endpoint, &buffer, -1, -1);
+ if (rc < 0) {
+ printk(KERN_ERR "%s: could not read: %d\n",
+ __func__, 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)
+{
+ return platform_driver_register(&rpcservers_driver);
+}
+
+module_init(rpc_servers_init);
+
+MODULE_DESCRIPTION("MSM RPC Servers");
+MODULE_AUTHOR("Iliyan Malchev <ibm@...roid.com>");
+MODULE_LICENSE("GPL");
--
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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