/*
************************************************************************************************************************
* GET LOG PAGE PARAMETER
*
*Description: Get a page from log block for read or write.
*
*Arguments : nBlk the logical block number of the log block;
* nPage the number of the logical page, which page need log page;
* nMode the type of get log page, 'r' or 'w', others is invalid.
*
*Return : the number of the log page;
* != 0xffff get log page successful, return page number;
* = 0xffff get log page failed.
*
*Note : Scan the log block table to try to get the log block.
* when the get type is 'r', if the log block is exsit and the logical
* page contain a log page, return the number of the log page, else,
* return 0xffff;
* when the get type is 'w', if the log block is not exsit, need create
* log block, then, if get log page failed, need merge the log block, and
* try to get log page again, this mode should return a value page number
* except there is no enough valid blocks.
************************************************************************************************************************
*/
__u32 PMM_GetLogPage(__u32 nBlk, __u32 nPage, __u8 nMode)
{
__s32 result, tmpLogPst;
__u16 tmpPage, PhyPageNum;
if(nMode == 'r')
{
tmpLogPst = _GetLogBlkPst(nBlk);
if(tmpLogPst < 0)
{
//get log page by read mode, there is no log block, return invalid value
return INVALID_PAGE_NUM;
}
//need swap the page mapping table to ram which is accessing currently
result = PMM_SwitchMapTbl(tmpLogPst);
if(result < 0)
{
MAPPING_ERR("[MAPPING_ERR] Switch page mapping table failed when get log page! Err:0x%x\n", result);
return INVALID_PAGE_NUM;
}
_CalLogAccessCnt(tmpLogPst);
//get active read log block index
if((SUPPORT_LOG_BLOCK_MANAGE)&&(LOG_BLK_TBL[tmpLogPst].LogBlkType == LSB_TYPE))
{
PhyPageNum = PAGE_MAP_TBL[nPage].PhyPageNum;
if((PhyPageNum&(0x1<<15))&&(PhyPageNum!= 0xffff))
{
LOG_BLK_TBL[tmpLogPst].ReadBlkIndex = 1;
PhyPageNum &= 0x7fff;
}
else
LOG_BLK_TBL[tmpLogPst].ReadBlkIndex = 0;
return (PhyPageNum|LOG_BLK_TBL[tmpLogPst].ReadBlkIndex<<16);
}
else
{
LOG_BLK_TBL[tmpLogPst].ReadBlkIndex = 0;
return PAGE_MAP_TBL[nPage].PhyPageNum;
}
}
result = _GetLogPageForWrite(nBlk, nPage, &tmpPage, (__u32 *)&tmpLogPst);
if(result < 0)
{
//get log page for write failed
MAPPING_ERR("[MAPPING_ERR] Get log page for write failed!\n");
return INVALID_PAGE_NUM;
}
//check if the log page is valid
if(!(tmpPage < PAGE_CNT_OF_SUPER_BLK))
{
//the log page is not invalid, need to merge the log block, and get again
result = LML_MergeLogBlk(SPECIAL_MERGE_MODE, nBlk);
if(result < 0)
{
//merge log block failed, report error
MAPPING_ERR("[MAPPING_ERR] Merge log block failed when get log page! Err:0x%x\n", result);
return INVALID_PAGE_NUM;
}
//try to get log page for write again
result = _GetLogPageForWrite(nBlk, nPage, &tmpPage, (__u32 *)&tmpLogPst);
if(result < 0)
{
//get log page for write failed
MAPPING_ERR("[MAPPING_ERR] Get log page for write failed!\n");
return INVALID_PAGE_NUM;
}
}
//check if the log page is valid
if(!(tmpPage < PAGE_CNT_OF_SUPER_BLK))
{
//get log page for write failed
MAPPING_ERR("[MAPPING_ERR] Get log page for write failed!\n");
return INVALID_PAGE_NUM;
}
else
{
LOG_BLK_TBL[tmpLogPst].LastUsedPage = tmpPage;
}
//update the page mapping table item
if((SUPPORT_LOG_BLOCK_MANAGE)&&(LOG_BLK_TBL[tmpLogPst].LogBlkType == LSB_TYPE))
{
DBUG_MSG("[DBUG_MSG] PMM_GetLogPage 2, select bak log block\n");
PAGE_MAP_TBL[nPage].PhyPageNum = tmpPage|((LOG_BLK_TBL[tmpLogPst].WriteBlkIndex&0x1)<<15);
}
else
PAGE_MAP_TBL[nPage].PhyPageNum = tmpPage;
//set the flag that mark need update the page mapping table
PAGE_MAP_CACHE->DirtyFlag = 1;
_CalLogAccessCnt(tmpLogPst);
if((SUPPORT_LOG_BLOCK_MANAGE)&&(LOG_BLK_TBL[tmpLogPst].LogBlkType == LSB_TYPE))
return (tmpPage|LOG_BLK_TBL[tmpLogPst].WriteBlkIndex<<16);
else
return tmpPage;
}
