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rt-thread/components/vbus/vbus.c

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/*
* COPYRIGHT (C) 2011-2021, Real-Thread Information Technology Ltd
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2013-11-04 Grissiom add comment
*/
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include "vbus.h"
#include "prio_queue.h"
#include "vbus_hw.h"
//#define RT_VBUS_STATISTICS
#define RT_VBUS_RB_LOW_TICK (RT_VMM_RB_BLK_NR * 2 / 3)
#define RT_VBUS_RB_TICK_STEP (100)
/* console could be run on vbus. If we log on it, there will be oops. */
#define vbus_debug(...)
#define vbus_verbose(...)
#define vbus_info(...)
#define vbus_error(...)
#ifndef ARRAY_SIZE
#define ARRAY_SIZE(ar) (sizeof(ar)/sizeof(ar[0]))
#endif
struct rt_vbus_ring *RT_VBUS_OUT_RING;
struct rt_vbus_ring *RT_VBUS_IN_RING;
const char *rt_vbus_chn_st2str[] = {
"available",
"closed",
"establishing",
"established",
"suspended",
"closing",
};
const char *rt_vbus_sess_st2str[] = {
"available",
"listening",
"establishing",
};
const char *rt_vbus_cmd2str[] = {
"ENABLE",
"DISABLE",
"SET",
"ACK",
"NAK",
"SUSPEND",
"RESUME",
};
static char* dump_cmd_pkt(unsigned char *dp, size_t dsize);
/* 4 bytes for the head */
#define LEN2BNR(len) ((len + RT_VBUS_BLK_HEAD_SZ \
+ sizeof(struct rt_vbus_blk) - 1) \
/ sizeof(struct rt_vbus_blk))
rt_inline void _ring_add_get_bnr(struct rt_vbus_ring *ring,
rt_size_t bnr)
{
int nidx = ring->get_idx + bnr;
if (nidx >= RT_VMM_RB_BLK_NR)
{
nidx -= RT_VMM_RB_BLK_NR;
}
rt_vbus_smp_wmb();
ring->get_idx = nidx;
}
rt_inline int _bus_ring_space_nr(struct rt_vbus_ring *rg)
{
int delta;
rt_vbus_smp_rmb();
delta = rg->get_idx - rg->put_idx;
if (delta > 0)
{
/* Put is behind the get. */
return delta - 1;
}
else
{
/* delta is negative. */
return RT_VMM_RB_BLK_NR + delta - 1;
}
}
struct rt_vbus_pkg {
rt_uint8_t id;
rt_uint8_t prio;
rt_uint8_t finished;
rt_uint8_t len;
const void *data;
};
/* chn0 is always connected */
static enum rt_vbus_chn_status _chn_status[RT_VBUS_CHANNEL_NR];
rt_inline int _chn_connected(unsigned char chnr)
{
return _chn_status[chnr] == RT_VBUS_CHN_ST_ESTABLISHED ||
_chn_status[chnr] == RT_VBUS_CHN_ST_SUSPEND;
}
#ifdef RT_VBUS_USING_FLOW_CONTROL
#include <watermark_queue.h>
struct rt_watermark_queue _chn_wm_que[RT_VBUS_CHANNEL_NR];
void rt_vbus_set_post_wm(unsigned char chnr, unsigned int low, unsigned int high)
{
RT_ASSERT((0 < chnr) && (chnr < ARRAY_SIZE(_chn_wm_que)));
rt_wm_que_set_mark(&_chn_wm_que[chnr], low, high);
}
/* Threads suspended by the flow control of other side. */
rt_list_t _chn_suspended_threads[RT_VBUS_CHANNEL_NR];
struct
{
unsigned int level;
unsigned int high_mark;
unsigned int low_mark;
/* The suspend command does not have ACK. So if the other side still
* sending pkg after SUSPEND, warn it again. Also use it as a flag that
* tell me whether are we dropping from the high mark or not when reaching
* the low mark. */
unsigned int last_warn;
} _chn_recv_wm[RT_VBUS_CHANNEL_NR];
void rt_vbus_set_recv_wm(unsigned char chnr, unsigned int low, unsigned int high)
{
RT_ASSERT((0 < chnr) && (chnr < ARRAY_SIZE(_chn_recv_wm)));
_chn_recv_wm[chnr].low_mark = low;
_chn_recv_wm[chnr].high_mark = high;
}
#else
void rt_vbus_set_recv_wm(unsigned char chnr, unsigned int low, unsigned int high)
{}
void rt_vbus_set_post_wm(unsigned char chnr, unsigned int low, unsigned int high)
{}
#endif
struct {
rt_vbus_event_listener indicate;
void *ctx;
} _vbus_rx_indi[RT_VBUS_EVENT_ID_MAX][RT_VBUS_CHANNEL_NR];
void rt_vbus_register_listener(unsigned char chnr,
enum rt_vbus_event_id eve,
rt_vbus_event_listener indi,
void *ctx)
{
RT_ASSERT(chnr != 0 && chnr < RT_VBUS_CHANNEL_NR);
RT_ASSERT(eve < sizeof(_vbus_rx_indi)/sizeof(_vbus_rx_indi[0]));
_vbus_rx_indi[eve][chnr].indicate = indi;
_vbus_rx_indi[eve][chnr].ctx = ctx;
}
static void _vbus_indicate(enum rt_vbus_event_id eve, unsigned char chnr)
{
RT_ASSERT(eve < sizeof(_vbus_rx_indi)/sizeof(_vbus_rx_indi[0]));
if (_vbus_rx_indi[eve][chnr].indicate)
_vbus_rx_indi[eve][chnr].indicate(_vbus_rx_indi[eve][chnr].ctx);
}
#define _BUS_OUT_THRD_STACK_SZ 2048
#define _BUS_OUT_THRD_PRIO 8
#define _BUS_OUT_PKG_NR RT_VMM_RB_BLK_NR
static struct rt_thread _bus_out_thread;
static rt_uint8_t _bus_out_thread_stack[_BUS_OUT_THRD_STACK_SZ];
struct rt_prio_queue *_bus_out_que;
static void _bus_out_entry(void *param)
{
struct rt_vbus_pkg dpkg;
_bus_out_que = rt_prio_queue_create("vbus",
_BUS_OUT_PKG_NR,
sizeof(struct rt_vbus_pkg));
if (!_bus_out_que)
{
rt_kprintf("could not create vmm bus queue\n");
return;
}
while (rt_prio_queue_pop(_bus_out_que, &dpkg,
RT_WAITING_FOREVER) == RT_EOK)
{
int sp;
rt_uint32_t nxtidx;
const int dnr = LEN2BNR(dpkg.len);
#ifdef RT_VBUS_USING_FLOW_CONTROL
rt_wm_que_dec(&_chn_wm_que[dpkg.id]);
#endif
if (!_chn_connected(dpkg.id))
continue;
sp = _bus_ring_space_nr(RT_VBUS_OUT_RING);
vbus_debug("vmm bus out"
"(data: %p, len: %d, prio: %d, id: %d)\n",
dpkg.data, dpkg.len, dpkg.prio, dpkg.id);
/* wait for enough space */
while (sp < dnr)
{
rt_ubase_t lvl = rt_hw_interrupt_disable();
RT_VBUS_OUT_RING->blocked = 1;
rt_vbus_smp_wmb();
/* kick the guest, hoping this could force it do the work */
rt_vbus_tick(0, RT_VBUS_GUEST_VIRQ);
rt_thread_suspend(rt_thread_self());
rt_schedule();
RT_VBUS_OUT_RING->blocked = 0;
rt_hw_interrupt_enable(lvl);
sp = _bus_ring_space_nr(RT_VBUS_OUT_RING);
}
nxtidx = RT_VBUS_OUT_RING->put_idx + dnr;
RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].id = dpkg.id;
RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].qos = dpkg.prio;
RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].len = dpkg.len;
if (nxtidx >= RT_VMM_RB_BLK_NR)
{
unsigned int tailsz;
tailsz = (RT_VMM_RB_BLK_NR - RT_VBUS_OUT_RING->put_idx)
* sizeof(RT_VBUS_OUT_RING->blks[0]) - RT_VBUS_BLK_HEAD_SZ;
/* the remaining block is sufficient for the data */
if (tailsz > dpkg.len)
tailsz = dpkg.len;
rt_memcpy(&RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].data,
dpkg.data, tailsz);
rt_memcpy(&RT_VBUS_OUT_RING->blks[0],
((char*)dpkg.data)+tailsz,
dpkg.len - tailsz);
rt_vbus_smp_wmb();
RT_VBUS_OUT_RING->put_idx = nxtidx - RT_VMM_RB_BLK_NR;
}
else
{
rt_memcpy(&RT_VBUS_OUT_RING->blks[RT_VBUS_OUT_RING->put_idx].data,
dpkg.data, dpkg.len);
rt_vbus_smp_wmb();
RT_VBUS_OUT_RING->put_idx = nxtidx;
}
rt_vbus_smp_wmb();
rt_vbus_tick(0, RT_VBUS_GUEST_VIRQ);
if (dpkg.finished)
{
_vbus_indicate(RT_VBUS_EVENT_ID_TX, dpkg.id);
}
}
RT_ASSERT(0);
}
void rt_vbus_resume_out_thread(void)
{
rt_thread_resume(&_bus_out_thread);
rt_schedule();
}
rt_err_t rt_vbus_post(rt_uint8_t id,
rt_uint8_t prio,
const void *data,
rt_size_t size,
rt_int32_t timeout)
{
rt_err_t err = RT_EOK;
struct rt_vbus_pkg pkg;
unsigned int putsz;
const unsigned char *dp;
if (!_bus_out_que)
{
rt_kprintf("post (data: %p, size: %d, timeout: %d) "
"to bus before initialition\n",
data, size, timeout);
return -RT_ERROR;
}
if (id >= RT_VBUS_CHANNEL_NR)
return -RT_ERROR;
if (timeout != 0)
{
RT_DEBUG_IN_THREAD_CONTEXT;
}
#ifdef RT_VBUS_USING_FLOW_CONTROL
while (_chn_status[id] == RT_VBUS_CHN_ST_SUSPEND)
{
rt_thread_t thread;
if (timeout == 0)
{
return -RT_EFULL;
}
thread = rt_thread_self();
thread->error = RT_EOK;
/* We only touch the _chn_suspended_threads in thread, so lock the
* scheduler is enough. */
rt_enter_critical();
rt_thread_suspend(thread);
rt_list_insert_after(&_chn_suspended_threads[id], &thread->tlist);
if (timeout > 0)
{
rt_timer_control(&(thread->thread_timer),
RT_TIMER_CTRL_SET_TIME,
&timeout);
rt_timer_start(&(thread->thread_timer));
}
/* rt_exit_critical will do schedule on need. */
rt_exit_critical();
if (thread->error != RT_EOK)
return thread->error;
}
#endif
if (_chn_status[id] != RT_VBUS_CHN_ST_ESTABLISHED)
return -RT_ERROR;
dp = data;
pkg.id = id;
pkg.prio = prio;
for (putsz = 0; size; size -= putsz)
{
pkg.data = dp;
if (size > RT_VBUS_MAX_PKT_SZ)
{
putsz = RT_VBUS_MAX_PKT_SZ;
pkg.finished = 0;
}
else
{
putsz = size;
pkg.finished = 1;
}
pkg.len = putsz;
dp += putsz;
#ifdef RT_VBUS_USING_FLOW_CONTROL
err = rt_wm_que_inc(&_chn_wm_que[id], timeout);
if (err != RT_EOK)
break;
#endif
vbus_debug("post (data: %p(%d), size: %d, finshed: %d, timeout: %d)\n",
pkg.data, ((unsigned char*)pkg.data)[0],
pkg.len, pkg.finished, timeout);
err = rt_prio_queue_push(_bus_out_que, prio, &pkg, timeout);
if (err != RT_EOK)
break;
}
return err;
}
struct rt_completion _chn0_post_cmp;
void _chn0_tx_listener(void *p)
{
rt_completion_done(&_chn0_post_cmp);
}
/* Posts in channel0 should be sync. */
static rt_err_t _chn0_post(const void *data,
rt_size_t size,
int timeout)
{
rt_err_t err;
rt_completion_init(&_chn0_post_cmp);
err = rt_vbus_post(0, 0, data, size, timeout);
if (err != RT_EOK)
return err;
return rt_completion_wait(&_chn0_post_cmp, timeout);
}
#define _BUS_IN_THRD_STACK_SZ 1024
#define _BUS_IN_THRD_PRIO (_BUS_OUT_THRD_PRIO+1)
#if (_BUS_IN_THRD_PRIO == RT_THREAD_PRIORITY_MAX)
#error "_BUS_OUT_THRD_PRIO too low"
#endif
static struct rt_thread _bus_in_thread;
static rt_uint8_t _bus_in_thread_stack[_BUS_OUT_THRD_STACK_SZ];
static struct rt_semaphore _bus_in_sem;
static struct rt_event _bus_in_event;
/* {head, tail} */
#define _IN_ACT_HEAD 0
#define _IN_ACT_TAIL 1
static struct rt_vbus_data *_bus_in_action[RT_VBUS_CHANNEL_NR][2];
#ifdef RT_VBUS_STATISTICS
static unsigned int _bus_in_action_nr[RT_VBUS_CHANNEL_NR];
#endif
static void rt_vbus_notify_chn(unsigned char chnr, rt_err_t err)
{
#ifdef RT_VBUS_USING_FLOW_CONTROL
/* TODO: get rid of this */
/* Protect the list. */
rt_enter_critical();
while (!rt_list_isempty(&_chn_suspended_threads[chnr]))
{
rt_thread_t thread;
thread = rt_list_entry(_chn_suspended_threads[chnr].next,
struct rt_thread,
tlist);
thread->error = err;
rt_thread_resume(thread);
}
rt_exit_critical();
#endif
rt_event_send(&_bus_in_event, 1 << chnr);
}
static void rt_vbus_notify_set(rt_uint32_t set)
{
rt_event_send(&_bus_in_event, set);
}
rt_err_t rt_vbus_listen_on(rt_uint8_t chnr,
rt_int32_t timeout)
{
rt_uint32_t notuse;
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR || !_chn_connected(chnr))
return -RT_EIO;
return rt_event_recv(&_bus_in_event, 1 << chnr,
RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
timeout, &notuse);
}
void rt_vbus_data_push(unsigned int id, struct rt_vbus_data *act)
{
rt_ubase_t lvl;
RT_ASSERT(0 < id && id < RT_VBUS_CHANNEL_NR);
lvl = rt_hw_interrupt_disable();
if (_bus_in_action[id][_IN_ACT_HEAD] == RT_NULL)
{
_bus_in_action[id][_IN_ACT_HEAD] = act;
_bus_in_action[id][_IN_ACT_TAIL] = act;
}
else
{
_bus_in_action[id][_IN_ACT_TAIL]->next = act;
_bus_in_action[id][_IN_ACT_TAIL] = act;
}
#ifdef RT_VBUS_STATISTICS
_bus_in_action_nr[id]++;
#endif
rt_hw_interrupt_enable(lvl);
#ifdef RT_VBUS_USING_FLOW_CONTROL
_chn_recv_wm[id].level++;
if (_chn_recv_wm[id].level == 0)
_chn_recv_wm[id].level = ~0;
if (_chn_recv_wm[id].level > _chn_recv_wm[id].high_mark &&
_chn_recv_wm[id].level > _chn_recv_wm[id].last_warn)
{
unsigned char buf[2];
buf[0] = RT_VBUS_CHN0_CMD_SUSPEND;
buf[1] = id;
vbus_debug("%s --> remote\n", dump_cmd_pkt(buf, sizeof(buf)));
_chn0_post(buf, sizeof(buf), RT_WAITING_FOREVER);
/* Warn the other side in 100 more pkgs. */
_chn_recv_wm[id].last_warn = _chn_recv_wm[id].level + 100;
}
#endif
}
struct rt_vbus_data* rt_vbus_data_pop(unsigned int id)
{
struct rt_vbus_data *act;
rt_ubase_t lvl;
RT_ASSERT(0 < id && id < RT_VBUS_CHANNEL_NR);
lvl = rt_hw_interrupt_disable();
act = _bus_in_action[id][_IN_ACT_HEAD];
if (act)
{
_bus_in_action[id][_IN_ACT_HEAD] = act->next;
}
rt_hw_interrupt_enable(lvl);
#ifdef RT_VBUS_USING_FLOW_CONTROL
if (_chn_recv_wm[id].level != 0)
{
_chn_recv_wm[id].level--;
if (_chn_recv_wm[id].level <= _chn_recv_wm[id].low_mark &&
_chn_recv_wm[id].last_warn > _chn_recv_wm[id].low_mark)
{
unsigned char buf[2];
buf[0] = RT_VBUS_CHN0_CMD_RESUME;
buf[1] = id;
vbus_debug("%s --> remote\n", dump_cmd_pkt(buf, sizeof(buf)));
_chn0_post(buf, sizeof(buf), RT_WAITING_FOREVER);
_chn_recv_wm[id].last_warn = 0;
}
}
#endif
return act;
}
/* dump cmd that is not start with ACK/NAK */
static size_t __dump_naked_cmd(char *dst, size_t lsize,
unsigned char *dp, size_t dsize)
{
size_t len;
if (dp[0] == RT_VBUS_CHN0_CMD_DISABLE ||
dp[0] == RT_VBUS_CHN0_CMD_SUSPEND ||
dp[0] == RT_VBUS_CHN0_CMD_RESUME)
{
len = rt_snprintf(dst, lsize, "%s %d",
rt_vbus_cmd2str[dp[0]], dp[1]);
}
else if (dp[0] == RT_VBUS_CHN0_CMD_ENABLE)
{
len = rt_snprintf(dst, lsize, "%s %s",
rt_vbus_cmd2str[dp[0]], dp+1);
}
else if (dp[0] < RT_VBUS_CHN0_CMD_MAX)
{
len = rt_snprintf(dst, lsize, "%s %s %d",
rt_vbus_cmd2str[dp[0]],
dp+1, dp[2+rt_strlen((char*)dp+1)]);
}
else
{
len = rt_snprintf(dst, lsize, "(invalid)%d %d",
dp[0], dp[1]);
}
return len;
}
static char _cmd_dump_buf[64];
static char* dump_cmd_pkt(unsigned char *dp, size_t dsize)
{
size_t len;
if (dp[0] == RT_VBUS_CHN0_CMD_ACK || dp[0] == RT_VBUS_CHN0_CMD_NAK )
{
len = rt_snprintf(_cmd_dump_buf, sizeof(_cmd_dump_buf),
"%s ", rt_vbus_cmd2str[dp[0]]);
len += __dump_naked_cmd(_cmd_dump_buf+len, sizeof(_cmd_dump_buf)-len,
dp+1, dsize-1);
}
else
{
len = __dump_naked_cmd(_cmd_dump_buf, sizeof(_cmd_dump_buf),
dp, dsize);
}
if (len > sizeof(_cmd_dump_buf) - 1)
len = sizeof(_cmd_dump_buf) - 1;
_cmd_dump_buf[len] = '\0';
return _cmd_dump_buf;
}
static rt_err_t _chn0_echo_with(rt_uint8_t prefix,
rt_uint32_t dsize,
unsigned char *dp)
{
rt_err_t err;
unsigned char *resp;
resp = rt_malloc(dsize+1);
if (!resp)
return -RT_ENOMEM;
*resp = prefix;
rt_memcpy(resp+1, dp, dsize);
vbus_verbose("%s --> remote\n", dump_cmd_pkt(resp, dsize+1));
err = _chn0_post(resp, dsize+1, RT_WAITING_FOREVER);
rt_free(resp);
return err;
}
static rt_err_t _chn0_nak(rt_uint32_t dsize, unsigned char *dp)
{
return _chn0_echo_with(RT_VBUS_CHN0_CMD_NAK, dsize, dp);
}
static rt_err_t _chn0_ack(rt_uint32_t dsize, unsigned char *dp)
{
return _chn0_echo_with(RT_VBUS_CHN0_CMD_ACK, dsize, dp);
}
enum _vbus_session_st
{
SESSIOM_AVAILABLE,
SESSIOM_LISTENING,
SESSIOM_ESTABLISHING,
};
struct rt_vbus_conn_session
{
/* negative value means error */
int chnr;
enum _vbus_session_st st;
struct rt_completion cmp;
struct rt_vbus_request *req;
};
static struct rt_vbus_conn_session _sess[RT_VBUS_CHANNEL_NR/2];
static int _sess_find(const unsigned char *name,
enum _vbus_session_st st)
{
int i;
for (i = 0; i < ARRAY_SIZE(_sess); i++)
{
if (_sess[i].st == st && _sess[i].req->name &&
rt_strcmp(_sess[i].req->name, (char*)name) == 0)
break;
}
return i;
}
static int _chn0_actor(unsigned char *dp, size_t dsize)
{
if (*dp != RT_VBUS_CHN0_CMD_SUSPEND && *dp != RT_VBUS_CHN0_CMD_RESUME)
vbus_verbose("local <-- %s\n", dump_cmd_pkt(dp, dsize));
switch (*dp)
{
case RT_VBUS_CHN0_CMD_ENABLE:
{
int i, chnr;
rt_err_t err;
unsigned char *resp;
i = _sess_find(dp+1, SESSIOM_LISTENING);
if (i == ARRAY_SIZE(_sess))
{
_chn0_nak(dsize, dp);
break;
}
for (chnr = 0; chnr < ARRAY_SIZE(_chn_status); chnr++)
{
if (_chn_status[chnr] == RT_VBUS_CHN_ST_AVAILABLE)
break;
}
if (chnr == ARRAY_SIZE(_chn_status))
{
_chn0_nak(dsize, dp);
break;
}
resp = rt_malloc(dsize + 1);
if (!resp)
break;
*resp = RT_VBUS_CHN0_CMD_SET;
rt_memcpy(resp+1, dp+1, dsize-1);
resp[dsize] = chnr;
rt_vbus_set_recv_wm(chnr, _sess[i].req->recv_wm.low, _sess[i].req->recv_wm.high);
rt_vbus_set_post_wm(chnr, _sess[i].req->post_wm.low, _sess[i].req->post_wm.high);
vbus_verbose("%s --> remote\n", dump_cmd_pkt(resp, dsize+1));
err = _chn0_post(resp, dsize+1, RT_WAITING_FOREVER);
if (err == RT_EOK)
{
_sess[i].st = SESSIOM_ESTABLISHING;
vbus_debug("set sess %d st: %s\n", i,
rt_vbus_sess_st2str[_sess[i].st]);
_sess[i].chnr = chnr;
_chn_status[chnr] = RT_VBUS_CHN_ST_ESTABLISHING;
}
rt_free(resp);
}
break;
case RT_VBUS_CHN0_CMD_SET:
{
int i, chnr;
i = _sess_find(dp+1, SESSIOM_ESTABLISHING);
if (i == ARRAY_SIZE(_sess))
{
vbus_verbose("drop spurious packet\n");
break;
}
chnr = dp[1+rt_strlen((const char*)dp+1)+1];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
{
vbus_verbose("SET wrong chnr %d\n", chnr);
break;
}
if (_chn_status[chnr] != RT_VBUS_CHN_ST_AVAILABLE)
{
_chn0_nak(dsize, dp);
vbus_verbose("SET wrong chnr status %d, %s\n",
chnr, rt_vbus_chn_st2str[_chn_status[chnr]]);
break;
}
rt_vbus_set_recv_wm(chnr, _sess[i].req->recv_wm.low, _sess[i].req->recv_wm.high);
rt_vbus_set_post_wm(chnr, _sess[i].req->post_wm.low, _sess[i].req->post_wm.high);
if (_chn0_ack(dsize, dp) >= 0)
{
_sess[i].chnr = chnr;
_chn_status[chnr] = RT_VBUS_CHN_ST_ESTABLISHED;
vbus_debug("chn %d %s\n", chnr,
rt_vbus_chn_st2str[_chn_status[chnr]]);
rt_completion_done(&_sess[i].cmp);
}
}
break;
case RT_VBUS_CHN0_CMD_ACK:
if (dp[1] == RT_VBUS_CHN0_CMD_SET)
{
int i, chnr;
i = _sess_find(dp+2, SESSIOM_ESTABLISHING);
if (i == ARRAY_SIZE(_sess))
/* drop that spurious packet */
break;
chnr = dp[1+rt_strlen((const char*)dp+2)+2];
_sess[i].chnr = chnr;
_chn_status[chnr] = RT_VBUS_CHN_ST_ESTABLISHED;
vbus_debug("chn %d %s\n", chnr,
rt_vbus_chn_st2str[_chn_status[chnr]]);
rt_completion_done(&_sess[i].cmp);
}
else if (dp[1] == RT_VBUS_CHN0_CMD_DISABLE)
{
unsigned char chnr = dp[2];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
break;
/* We could only get here by sending DISABLE command, which is
* initiated by the rt_vbus_close_chn. */
_chn_status[chnr] = RT_VBUS_CHN_ST_AVAILABLE;
_vbus_indicate(RT_VBUS_EVENT_ID_DISCONN, chnr);
/* notify the thread that the channel has been closed */
rt_vbus_notify_chn(chnr, -RT_ERROR);
}
else
{
vbus_info("invalid ACK for %d\n", dp[1]);
}
break;
case RT_VBUS_CHN0_CMD_DISABLE:
{
unsigned char chnr = dp[1];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
break;
_chn_status[chnr] = RT_VBUS_CHN_ST_CLOSING;
_chn0_ack(dsize, dp);
_vbus_indicate(RT_VBUS_EVENT_ID_DISCONN, chnr);
/* notify the thread that the channel has been closed */
rt_vbus_notify_chn(chnr, -RT_ERROR);
}
break;
case RT_VBUS_CHN0_CMD_SUSPEND:
#ifdef RT_VBUS_USING_FLOW_CONTROL
{
unsigned char chnr = dp[1];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
break;
if (_chn_status[chnr] != RT_VBUS_CHN_ST_ESTABLISHED)
break;
_chn_status[chnr] = RT_VBUS_CHN_ST_SUSPEND;
}
#endif
break;
case RT_VBUS_CHN0_CMD_RESUME:
#ifdef RT_VBUS_USING_FLOW_CONTROL
{
unsigned char chnr = dp[1];
if (chnr == 0 || chnr >= RT_VBUS_CHANNEL_NR)
break;
if (_chn_status[chnr] != RT_VBUS_CHN_ST_SUSPEND)
break;
_chn_status[chnr] = RT_VBUS_CHN_ST_ESTABLISHED;
/* Protect the list. */
rt_enter_critical();
while (!rt_list_isempty(&_chn_suspended_threads[chnr]))
{
rt_thread_t thread;
thread = rt_list_entry(_chn_suspended_threads[chnr].next,
struct rt_thread,
tlist);
rt_thread_resume(thread);
}
rt_exit_critical();
}
#endif
break;
case RT_VBUS_CHN0_CMD_NAK:
if (dp[1] == RT_VBUS_CHN0_CMD_ENABLE)
{
int i;
i = _sess_find(dp+2, SESSIOM_ESTABLISHING);
if (i == ARRAY_SIZE(_sess))
/* drop that spurious packet */
break;
_sess[i].chnr = -RT_EIO;
rt_completion_done(&_sess[i].cmp);
}
else if (dp[1] == RT_VBUS_CHN0_CMD_SET)
{
vbus_info("NAK for %d not implemented\n", dp[1]);
}
else
{
vbus_info("invalid NAK for %d\n", dp[1]);
}
break;
default:
/* just ignore the invalid cmd */
vbus_info("drop unknown cmd %d on chn0\n", *dp);
break;
};
return RT_EOK;
}
int rt_vbus_request_chn(struct rt_vbus_request *req,
int timeout)
{
int i, chnr, err;
size_t plen = rt_strlen(req->name) + 2;
unsigned char *pbuf;
rt_ubase_t lvl;
lvl = rt_hw_interrupt_disable();
for (i = 0; i < ARRAY_SIZE(_sess); i++)
{
if (_sess[i].st == SESSIOM_AVAILABLE)
break;
}
if (i == ARRAY_SIZE(_sess))
{
rt_hw_interrupt_enable(lvl);
return -RT_ERROR;
}
rt_completion_init(&_sess[i].cmp);
_sess[i].req = req;
if (req->is_server)
{
_sess[i].st = SESSIOM_LISTENING;
rt_hw_interrupt_enable(lvl);
vbus_debug("request listening %s on %d\n", req->name, i);
/* always wait on the condition */
err = RT_EOK;
goto _waitforcmp;
}
pbuf = rt_malloc(plen);
if (!pbuf)
{
rt_hw_interrupt_enable(lvl);
return -RT_ENOMEM;
}
_sess[i].st = SESSIOM_ESTABLISHING;
rt_hw_interrupt_enable(lvl);
pbuf[0] = RT_VBUS_CHN0_CMD_ENABLE;
rt_memcpy(pbuf+1, req->name, plen-1);
vbus_verbose("%s --> remote\n", dump_cmd_pkt(pbuf, plen));
err = _chn0_post(pbuf, plen, RT_WAITING_FOREVER);
rt_free(pbuf);
_waitforcmp:
if (err == RT_EOK)
err = rt_completion_wait(&_sess[i].cmp, timeout);
vbus_debug("request wait cmp done %d, chnr %d\n", err, _sess[i].chnr);
if (err)
{
/* cleanup the mass when the wait is time out but we have done some job
*/
if (_sess[i].st == SESSIOM_ESTABLISHING)
_chn_status[_sess[i].chnr] = RT_VBUS_CHN_ST_AVAILABLE;
chnr = err;
goto Out;
}
RT_ASSERT(_sess[i].chnr != 0);
chnr = _sess[i].chnr;
Out:
/* detach the sess as we finished the job */
_sess[i].st = SESSIOM_AVAILABLE;
_sess[i].req = RT_NULL;
return chnr;
}
void rt_vbus_close_chn(unsigned char chnr)
{
void *p;
rt_err_t err;
unsigned char buf[2];
buf[0] = RT_VBUS_CHN0_CMD_DISABLE;
buf[1] = chnr;
RT_ASSERT(0 < chnr && chnr < RT_VBUS_CHANNEL_NR);
if (_chn_status[chnr] == RT_VBUS_CHN_ST_CLOSED ||
_chn_status[chnr] == RT_VBUS_CHN_ST_CLOSING)
{
_chn_status[chnr] = RT_VBUS_CHN_ST_AVAILABLE;
return;
}
if (!_chn_connected(chnr))
return;
_chn_status[chnr] = RT_VBUS_CHN_ST_CLOSING;
vbus_info("%s --> remote\n", dump_cmd_pkt(buf, sizeof(buf)));
err = _chn0_post(&buf, sizeof(buf), RT_WAITING_FOREVER);
if (err == RT_EOK)
/* wait for the ack */
rt_vbus_listen_on(chnr, 10 * RT_TICK_PER_SECOND);
/* cleanup the remaining data */
for (p = rt_vbus_data_pop(chnr); p; p = rt_vbus_data_pop(chnr))
rt_free(p);
/* FIXME: there is a chance that there are some data left on the send
* buffer. So if we connect other channel with the same number immediately,
* the new channel will receive some garbage data. However, this is highly
* un-probable. */
}
#ifdef RT_VBUS_STATISTICS
static unsigned int _total_data_sz;
#endif
static void _bus_in_entry(void *param)
{
rt_sem_init(&_bus_in_sem, "vbus", 0, RT_IPC_FLAG_FIFO);
rt_event_init(&_bus_in_event, "vbus", RT_IPC_FLAG_FIFO);
rt_memset(_bus_in_action, 0, sizeof(_bus_in_action));
while (rt_sem_take(&_bus_in_sem,
RT_WAITING_FOREVER) == RT_EOK)
{
rt_uint32_t event_set = 0;
/* while(not empty) */
while (RT_VBUS_IN_RING->get_idx != RT_VBUS_IN_RING->put_idx)
{
unsigned int id, nxtidx;
rt_size_t size;
struct rt_vbus_data *act;
rt_vbus_smp_rmb();
size = RT_VBUS_IN_RING->blks[RT_VBUS_IN_RING->get_idx].len;
id = RT_VBUS_IN_RING->blks[RT_VBUS_IN_RING->get_idx].id;
vbus_debug("vmm bus in: chnr %d, size %d\n", id, size);
/* Suspended channel can still recv data. */
if (id > RT_VBUS_CHANNEL_NR || !_chn_connected(id))
{
vbus_error("drop on invalid chn %d\n", id);
/* drop the invalid packet */
_ring_add_get_bnr(RT_VBUS_IN_RING, LEN2BNR(size));
continue;
}
if (id == 0)
{
if (size > 60)
vbus_error("too big(%d) packet on chn0\n", size);
else
_chn0_actor(RT_VBUS_IN_RING->blks[RT_VBUS_IN_RING->get_idx].data, size);
_ring_add_get_bnr(RT_VBUS_IN_RING, LEN2BNR(size));
continue;
}
#ifdef RT_VBUS_STATISTICS
_total_data_sz += size;
#endif
act = rt_malloc(sizeof(*act) + size);
if (act == RT_NULL)
{
//vbus_error("drop on OOM (%d, %d)\n", id, size);
/* drop the packet on malloc fall */
_ring_add_get_bnr(RT_VBUS_IN_RING, LEN2BNR(size));
continue;
}
act->size = size;
act->next = RT_NULL;
nxtidx = RT_VBUS_IN_RING->get_idx + LEN2BNR(size);
if (nxtidx >= RT_VMM_RB_BLK_NR)
{
unsigned int tailsz;
tailsz = (RT_VMM_RB_BLK_NR - RT_VBUS_IN_RING->get_idx)
* sizeof(RT_VBUS_IN_RING->blks[0]) - RT_VBUS_BLK_HEAD_SZ;
/* the remaining block is sufficient for the data */
if (tailsz > size)
tailsz = size;
rt_memcpy(act+1, &RT_VBUS_IN_RING->blks[RT_VBUS_IN_RING->get_idx].data, tailsz);
rt_memcpy((char*)(act+1) + tailsz, &RT_VBUS_IN_RING->blks[0], size - tailsz);
/* It shall make sure the CPU has finished reading the item
* before it writes the new tail pointer, which will erase the
* item. */
rt_vbus_smp_wmb();
RT_VBUS_IN_RING->get_idx = nxtidx - RT_VMM_RB_BLK_NR;
}
else
{
rt_memcpy(act+1, &RT_VBUS_IN_RING->blks[RT_VBUS_IN_RING->get_idx].data, size);
rt_vbus_smp_wmb();
RT_VBUS_IN_RING->get_idx = nxtidx;
}
rt_vbus_data_push(id, act);
_vbus_indicate(RT_VBUS_EVENT_ID_RX, id);
event_set |= 1 << id;
if (RT_VBUS_IN_RING->blocked)
rt_vbus_tick(0, RT_VBUS_GUEST_VIRQ);
}
if (event_set != 0)
rt_vbus_notify_set(event_set);
}
RT_ASSERT(0);
}
void rt_vbus_isr(int irqnr, void *param)
{
if (RT_VBUS_OUT_RING->blocked)
rt_vbus_resume_out_thread();
rt_sem_release(&_bus_in_sem);
rt_vbus_hw_eoi(irqnr, param);
}
int rt_vbus_init(void *outr, void *inr)
{
int i;
if (outr > inr)
{
RT_ASSERT((char*)outr - (char*)inr >= sizeof(struct rt_vbus_ring));
}
else
{
RT_ASSERT((char*)inr - (char*)outr >= sizeof(struct rt_vbus_ring));
}
RT_VBUS_OUT_RING = outr;
RT_VBUS_IN_RING = inr;
rt_memset(RT_VBUS_OUT_RING, 0, sizeof(*RT_VBUS_OUT_RING));
rt_memset(RT_VBUS_IN_RING, 0, sizeof(*RT_VBUS_IN_RING));
_chn_status[0] = RT_VBUS_CHN_ST_ESTABLISHED;
for (i = 1; i < ARRAY_SIZE(_chn_status); i++)
{
_chn_status[i] = RT_VBUS_CHN_ST_AVAILABLE;
}
for (i = 0; i < ARRAY_SIZE(_sess); i++)
{
_sess[i].req = RT_NULL;
_sess[i].st = SESSIOM_AVAILABLE;
}
_vbus_rx_indi[RT_VBUS_EVENT_ID_TX][0].indicate = _chn0_tx_listener;
_vbus_rx_indi[RT_VBUS_EVENT_ID_TX][0].ctx = RT_NULL;
#ifdef RT_VBUS_USING_FLOW_CONTROL
for (i = 0; i < ARRAY_SIZE(_chn_wm_que); i++)
{
rt_wm_que_init(&_chn_wm_que[i],
RT_VMM_RB_BLK_NR / 3,
RT_VMM_RB_BLK_NR * 2 / 3);
}
/* Channel 0 has the full channel. */
rt_wm_que_set_mark(&_chn_wm_que[0], 0, ~0);
for (i = 0; i < ARRAY_SIZE(_chn_suspended_threads); i++)
{
rt_list_init(&_chn_suspended_threads[i]);
}
for (i = 1; i < ARRAY_SIZE(_chn_recv_wm); i++)
{
rt_vbus_set_recv_wm(i,
RT_VMM_RB_BLK_NR / 3,
RT_VMM_RB_BLK_NR * 2 / 3);
_chn_recv_wm[i].level = 0;
_chn_recv_wm[i].last_warn = 0;
}
/* Channel 0 has the full channel. Don't suspend it. */
_chn_recv_wm[0].low_mark = 0;
_chn_recv_wm[0].high_mark = ~0;
_chn_recv_wm[0].level = 0;
_chn_recv_wm[0].last_warn = 0;
#endif
rt_thread_init(&_bus_out_thread, "vbusout",
_bus_out_entry, RT_NULL,
_bus_out_thread_stack, sizeof(_bus_out_thread_stack),
_BUS_OUT_THRD_PRIO, 20);
rt_thread_startup(&_bus_out_thread);
rt_thread_init(&_bus_in_thread, "vbusin",
_bus_in_entry, RT_NULL,
_bus_in_thread_stack, sizeof(_bus_in_thread_stack),
_BUS_IN_THRD_PRIO, 20);
rt_thread_startup(&_bus_in_thread);
rt_vbus_hw_init();
rt_kprintf("VBus loaded: %d out blocks, %d in blocks\n",
RT_VMM_RB_BLK_NR, RT_VMM_RB_BLK_NR);
rt_vbus_chnx_init();
return 0;
}
void rt_vbus_rb_dump(void)
{
rt_kprintf("OUT ring:(%s blocked)\n", RT_VBUS_OUT_RING->blocked ? "is" : "not");
rt_kprintf("put idx: %8x, get idx: %8x\n",
RT_VBUS_OUT_RING->put_idx, RT_VBUS_OUT_RING->get_idx);
rt_kprintf("space: %d\n", _bus_ring_space_nr(RT_VBUS_OUT_RING));
rt_kprintf("IN ring:(%s blocked)\n", RT_VBUS_IN_RING->blocked ? "is" : "not");
rt_kprintf("put idx: %8x, get idx: %8x\n",
RT_VBUS_IN_RING->put_idx, RT_VBUS_IN_RING->get_idx);
rt_kprintf("space: %d\n", _bus_ring_space_nr(RT_VBUS_IN_RING));
}
void rt_vbus_chn_dump(void)
{
int i;
rt_kprintf("vbus channel status:\n");
for (i = 0; i < ARRAY_SIZE(_chn_status); i++)
{
rt_kprintf("%2d:%s\n", i, rt_vbus_chn_st2str[_chn_status[i]]);
}
}
void rt_vbus_sess_dump(void)
{
int i;
rt_kprintf("vbus conn session:\n");
for (i = 0; i < ARRAY_SIZE(_sess); i++)
{
rt_kprintf("%2d(%s):%s\n", i, _sess[i].req ? _sess[i].req->name : "",
rt_vbus_sess_st2str[_sess[i].st]);
}
}
void rt_vbus_que_dump(void)
{
rt_kprintf("out que:\n");
rt_prio_queue_dump(_bus_out_que);
}
unsigned int rt_vbus_total_data_sz(void)
{
#ifdef RT_VBUS_STATISTICS
return _total_data_sz;
#else
return (unsigned int)-1;
#endif
}
void rt_vbus_data_pkt_dump(void)
{
int i;
for (i = 0; i < ARRAY_SIZE(_bus_in_action); i++)
{
struct rt_vbus_data *dp;
#ifdef RT_VBUS_STATISTICS
rt_kprintf("%2d %4d: ", i, _bus_in_action_nr[i]);
#else
rt_kprintf("%2d: ", i);
#endif
for (dp = _bus_in_action[i][_IN_ACT_HEAD];
dp;
dp = dp->next)
{
rt_kprintf("%p(%d) -> ", dp, dp->size);
}
rt_kprintf(" nil\n");
}
}
#ifdef RT_VBUS_USING_FLOW_CONTROL
void rt_vbus_chm_wm_dump(void)
{
int i;
rt_kprintf("post wm:\n");
for (i = 0; i < ARRAY_SIZE(_chn_wm_que); i++)
rt_wm_que_dump(&_chn_wm_que[i]);
rt_kprintf("recv wm:\n");
rt_kprintf(" low, high, cur, last warn\n");
for (i = 0; i < ARRAY_SIZE(_chn_recv_wm); i++)
{
rt_kprintf("%8x, %8x, %8x, %8x\n",
_chn_recv_wm[i].low_mark, _chn_recv_wm[i].high_mark,
_chn_recv_wm[i].level, _chn_recv_wm[i].last_warn);
}
}
#endif
#ifdef RT_USING_FINSH
#include <finsh.h>
FINSH_FUNCTION_EXPORT_ALIAS(rt_vbus_rb_dump, vbrb, dump vbus ringbuffer status);
FINSH_FUNCTION_EXPORT_ALIAS(rt_vbus_chn_dump, vbchn, dump vbus channel status);
FINSH_FUNCTION_EXPORT_ALIAS(rt_vbus_sess_dump, vbses, dump vbus session status);
FINSH_FUNCTION_EXPORT_ALIAS(rt_vbus_que_dump, vbque, dump vbus out queue status);
FINSH_FUNCTION_EXPORT_ALIAS(rt_vbus_total_data_sz, vbtsz, total in data);
FINSH_FUNCTION_EXPORT_ALIAS(rt_vbus_data_pkt_dump, vbdq, dump the data queue);
#ifdef RT_VBUS_USING_FLOW_CONTROL
FINSH_FUNCTION_EXPORT_ALIAS(rt_vbus_chm_wm_dump, vbwm, dump vbus water mark status);
#endif
#endif
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