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/************************************************************************************************************ */
/*****Copyright: 2014 Spreatrum. All Right Reserved */
/*****File: mdbg_ring.c */
/*****Description: Marlin Debug System ring buffer implementation. */
/*****Developer: fan.kou@spreadtrum.com */
/*****Date: 06/01/2014 */
/************************************************************************************************************ */
/*******************************************************/
/*********************INCLUDING********************/
/*******************************************************/
#include "mdbg_ring.h"
/*******************************************************/
/***********Local Functions Declaration************/
/*******************************************************/
#define MDBG_RING_LOCK_INIT(pRing) mutex_init(pRing->plock)
#define MDBG_RING_LOCK_UNINIT(pRing) mutex_destroy(pRing->plock)
#define MDBG_RING_LOCK(pRing) mutex_lock(pRing->plock)
#define MDBG_RING_UNLOCK(pRing) mutex_unlock(pRing->plock)
#define _MDBG_RING_REMAIN(rp,wp,size) ((u_long)wp >= (u_long)rp?(size - (u_long)wp + (u_long)rp - 1): ((u_long)rp - (u_long)wp -1))
LOCAL MDBG_SIZE_T mdbg_ring_remain(MDBG_RING_T* pRing);
LOCAL MDBG_SIZE_T mdbg_ring_content_len(MDBG_RING_T* pRing);
LOCAL char* mdbg_ring_start(MDBG_RING_T* pRing);
LOCAL char* mdbg_ring_end(MDBG_RING_T* pRing);
LOCAL bool mdbg_ring_over_loop(MDBG_RING_T* pRing, u_long len, int rw);
/*******************************************************/
/******************Ring Life Cycle*******************/
/*******************************************************/
PUBLIC MDBG_RING_T* mdbg_ring(MDBG_SIZE_T size)
{
MDBG_RING_T* pRing = NULL;
do{
if(size < MDBG_RING_MIN_SIZE){
MDBG_ERR("size error:%d",size);
break;
}
pRing = kmalloc(sizeof(MDBG_RING_T),GFP_KERNEL);
if(NULL == pRing){
MDBG_ERR("Ring malloc Failed.");
break;
}
pRing->pbuff = kmalloc(size,GFP_KERNEL);
if(NULL == pRing->pbuff){
MDBG_ERR("Ring buff malloc Failed.");
break;
}
pRing->plock = kmalloc(MDBG_RING_LOCK_SIZE, GFP_KERNEL);
if(NULL == pRing->plock){
MDBG_ERR("Ring lock malloc Failed.");
break;
}
MDBG_RING_LOCK_INIT(pRing);
memset(pRing->pbuff,0,size);
pRing->size = size;
pRing->rp = pRing->pbuff;
pRing->wp = pRing->pbuff;
pRing->end = (char*)(((u_long)pRing->pbuff) + (pRing->size - 1));
return (pRing);//created a MDBG_RING!
}while(0);
mdbg_ring_destroy(pRing);
return (NULL);//failed
}
PUBLIC void mdbg_ring_destroy(MDBG_RING_T* pRing)
{
MDBG_LOG("pRing = %p",pRing);
MDBG_LOG("pRing->pbuff = %p",pRing->pbuff);
if(pRing != NULL){
if(pRing->pbuff != NULL){
MDBG_LOG("to free pRing->pbuff.");
kfree(pRing->pbuff);
pRing->pbuff = NULL;
}
if(pRing->plock != NULL){
MDBG_LOG("to free pRing->plock.");
MDBG_RING_LOCK_UNINIT(pRing);
kfree(pRing->plock);
pRing->plock = NULL;
}
MDBG_LOG("to free pRing.");
kfree(pRing);
pRing = NULL;
}
return;
}
/*******************************************************/
/****************Ring RW Fucntions*****************/
/*******************************************************/
PUBLIC int mdbg_ring_read(MDBG_RING_T* pRing, char* buf, int len)
{
int len1,len2 = 0;
int cont_len = 0;
int read_len = 0;
char* pstart = NULL;
char* pend = NULL;
if((NULL == buf) ||(NULL == pRing) ||(0 == len)){
MDBG_ERR("Ring Read Failed, Param Error!,buf=%p,pRing=%p,len=%d",buf,pRing,len);
return (MDBG_ERR_BAD_PARAM);
}
MDBG_RING_LOCK(pRing);
cont_len = mdbg_ring_content_len(pRing);
read_len = cont_len >= len?len:cont_len;
pstart = mdbg_ring_start(pRing);
pend = mdbg_ring_end(pRing);
MDBG_LOG("read_len=%d",read_len);
MDBG_LOG("buf=%p",buf);
MDBG_LOG("pstart=%p",pstart);
MDBG_LOG("pend=%p",pend);
MDBG_LOG("pRing->rp=%p",pRing->rp);
if((0 == read_len)||(0 == cont_len)){
MDBG_LOG("read_len=0 OR Ring Empty.");
MDBG_RING_UNLOCK(pRing);
return (0);//ring empty
}
if(mdbg_ring_over_loop(pRing,read_len,MDBG_RING_R)){
MDBG_LOG("Ring loopover.");
len1 = pend - pRing->rp + 1;
len2 = read_len -len1;
memcpy(buf, pRing->rp, len1);
memcpy((buf+ len1), pstart, len2);
pRing->rp = (char *)((u_long)pstart + len2);
}else{
memcpy(buf, pRing->rp, read_len);
pRing->rp += read_len;
}
MDBG_LOG("Ring did read len =%d.",read_len);
MDBG_RING_UNLOCK(pRing);
return (read_len);
}
PUBLIC int mdbg_ring_write(MDBG_RING_T* pRing, char* buf, int len)
{
int len1,len2 = 0;
char* pstart = NULL;
char* pend = NULL;
if((NULL == pRing) || (NULL == buf)||(0 == len)){
MDBG_ERR("Ring Write Failed, Param Error!,buf=%p,pRing=%p,len=%d",buf,pRing,len);
return (MDBG_ERR_BAD_PARAM);
}
pstart = mdbg_ring_start(pRing);
pend = mdbg_ring_end(pRing);
MDBG_LOG("pstart = %p",pstart);
MDBG_LOG("pend = %p",pend);
MDBG_LOG("buf = %p",buf);
MDBG_LOG("len = %d",len);
MDBG_LOG("pRing->wp = %p",pRing->wp);
if(mdbg_ring_over_loop(pRing, len, MDBG_RING_W)){
MDBG_LOG("Ring overloop.");
len1 = pend - pRing->wp + 1;
len2 = len - len1;
memcpy(pRing->wp, buf, len1);
memcpy(pstart, (buf + len1), len2);
pRing->wp = (char *)((u_long)pstart + len2);
}else{
memcpy(pRing->wp, buf, len);
pRing->wp += len;
}
MDBG_LOG("Ring Wrote len = %d",len);
return (len);
}
PUBLIC char* mdbg_ring_write_ext(MDBG_RING_T* pRing, MDBG_SIZE_T len)
{
char* wp = NULL;
MDBG_LOG("pRing=%p,pRing->wp=%p,len=%d.", pRing, pRing->wp, len);
if((NULL == pRing)||(0 == len)){
MDBG_ERR("Ring Write Ext Failed, Param Error!");
return (NULL);
}
if(mdbg_ring_over_loop(pRing, len, MDBG_RING_R)||mdbg_ring_will_full(pRing, len)){
MDBG_LOG("Ring Write Ext Failed, Ring State Error!,overloop=%d,full=%d.",mdbg_ring_over_loop(pRing, len, MDBG_RING_R),mdbg_ring_will_full(pRing, len));
return (NULL);
}
MDBG_RING_LOCK(pRing);
wp = pRing->wp;
pRing->wp += len;
MDBG_LOG("return wp=%p,pRing->wp=%p.", wp, pRing->wp);
MDBG_RING_UNLOCK(pRing);
return (wp);
}
/*******************************************************/
/******************Utility Fucntions*******************/
/*******************************************************/
PUBLIC bool mdbg_ring_will_full(MDBG_RING_T* pRing, int len)
{
return(len > mdbg_ring_remain(pRing));
}
LOCAL MDBG_SIZE_T mdbg_ring_remain(MDBG_RING_T* pRing)
{
return ((MDBG_SIZE_T)_MDBG_RING_REMAIN(pRing->rp, pRing->wp, pRing->size));
}
LOCAL MDBG_SIZE_T mdbg_ring_content_len(MDBG_RING_T* pRing)
{
return (pRing->size - mdbg_ring_remain(pRing) - 1);
}
LOCAL char* mdbg_ring_start(MDBG_RING_T* pRing)
{
return(pRing->pbuff);
}
LOCAL char* mdbg_ring_end(MDBG_RING_T* pRing)
{
return(pRing->end);
}
LOCAL bool mdbg_ring_over_loop(MDBG_RING_T* pRing, u_long len, int rw)
{
if(MDBG_RING_R == rw){
return ((u_long)pRing->rp + len > (u_long)mdbg_ring_end(pRing));
}else{
return ((u_long)pRing->wp + len > (u_long)mdbg_ring_end(pRing));
}
}
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