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smd_rpcrouter.c
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smd_rpcrouter.c
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/* 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/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/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 int smd_wait_count; /* odd while waiting */
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 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 atomic_t rpcrouter_pdev_created = ATOMIC_INIT(0);
#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;
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;
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 != 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);
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);
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)
{
if (atomic_cmpxchg(&rpcrouter_pdev_created, 0, 1) == 0)
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);
smd_wait_count++;
wake_up(&smd_wait);
wait_event(smd_wait, smd_read_avail(smd_channel) >= len);
smd_wait_count++;
}
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(sizeof(*frag));
frag->next = NULL;
frag->length = hdr.size;
if (rr_read(frag->data, hdr.size)) {
kfree(frag);
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) {
wake_lock_timeout(&ept->read_q_wake_lock, HZ / 2);
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");
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);
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;
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 !defined(CONFIG_MSM_LEGACY_7X00A_AMSS)
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 */
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;
goto found_rroute;
}
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;