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flash.c
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/*****************************************************************************************************************************
This project was supported by the National Basic Research 973 Program of China under Grant No.2011CB302301
Huazhong University of Science and Technology (HUST) Wuhan National Laboratory for Optoelectronics
FileName： flash.c
Author: Hu Yang Version: 2.1 Date:2011/12/02
Description:
History:
<contributor> <time> <version> <desc> <e-mail>
Yang Hu 2009/09/25 1.0 Creat SSDsim [email protected]
2010/05/01 2.x Change
Zhiming Zhu 2011/07/01 2.0 Change [email protected]
Shuangwu Zhang 2011/11/01 2.1 Change [email protected]
Chao Ren 2011/07/01 2.0 Change [email protected]
Hao Luo 2011/01/01 2.0 Change [email protected]
*****************************************************************************************************************************/
#include "flash.h"
/**********************
*这个函数只作用于写请求
***********************/
Status allocate_location(struct ssd_info * ssd ,struct sub_request *sub_req)
{
struct sub_request * update=NULL;
unsigned int channel_num=0,chip_num=0,die_num=0,plane_num=0;
struct local *location=NULL;
channel_num=ssd->parameter->channel_number;
chip_num=ssd->parameter->chip_channel[0];
die_num=ssd->parameter->die_chip;
plane_num=ssd->parameter->plane_die;
if (ssd->parameter->allocation_scheme==0) /*动态分配的情况*/
{
/******************************************************************
* 在动态分配中，因为页的更新操作使用不了copyback操作，
*需要产生一个读请求，并且只有这个读请求完成后才能进行这个页的写操作
*******************************************************************/
if (ssd->dram->map->map_entry[sub_req->lpn].state!=0)
{
if ((sub_req->state&ssd->dram->map->map_entry[sub_req->lpn].state)!=ssd->dram->map->map_entry[sub_req->lpn].state)
{
ssd->read_count++;
ssd->update_read_count++;
update=(struct sub_request *)malloc(sizeof(struct sub_request));
alloc_assert(update,"update");
memset(update,0, sizeof(struct sub_request));
if(update==NULL)
{
return ERROR;
}
update->location=NULL;
update->next_node=NULL;
update->next_subs=NULL;
update->update=NULL;
location = find_location(ssd,ssd->dram->map->map_entry[sub_req->lpn].pn);
update->location=location;
update->begin_time = ssd->current_time;
update->current_state = SR_WAIT;
update->current_time=MAX_INT64;
update->next_state = SR_R_C_A_TRANSFER;
update->next_state_predict_time=MAX_INT64;
update->lpn = sub_req->lpn;
update->state=((ssd->dram->map->map_entry[sub_req->lpn].state^sub_req->state)&0x7fffffff);
update->size=size(update->state);
update->ppn = ssd->dram->map->map_entry[sub_req->lpn].pn;
update->operation = READ;
if (ssd->channel_head[location->channel].subs_r_tail!=NULL) /*产生新的读请求，并且挂到channel的subs_r_tail队列尾*/
{
ssd->channel_head[location->channel].subs_r_tail->next_node=update;
ssd->channel_head[location->channel].subs_r_tail=update;
}
else
{
ssd->channel_head[location->channel].subs_r_tail=update;
ssd->channel_head[location->channel].subs_r_head=update;
}
}
}
/***************************************
*一下是动态分配的几种情况
*0：全动态分配
*1：表示channel定package，die，plane动态
****************************************/
switch(ssd->parameter->dynamic_allocation)
{
case 0:
{
sub_req->location->channel=-1;
sub_req->location->chip=-1;
sub_req->location->die=-1;
sub_req->location->plane=-1;
sub_req->location->block=-1;
sub_req->location->page=-1;
if (ssd->subs_w_tail!=NULL)
{
ssd->subs_w_tail->next_node=sub_req;
ssd->subs_w_tail=sub_req;
}
else
{
ssd->subs_w_tail=sub_req;
ssd->subs_w_head=sub_req;
}
if (update!=NULL)
{
sub_req->update=update;
}
break;
}
case 1:
{
sub_req->location->channel=sub_req->lpn%ssd->parameter->channel_number;
sub_req->location->chip=-1;
sub_req->location->die=-1;
sub_req->location->plane=-1;
sub_req->location->block=-1;
sub_req->location->page=-1;
if (update!=NULL)
{
sub_req->update=update;
}
break;
}
case 2:
{
break;
}
case 3:
{
break;
}
}
}
else
{ /***************************************************************************
*是静态分配方式，所以可以将这个子请求的最终channel，chip，die，plane全部得出
*总共有0,1,2,3,4,5,这六种静态分配方式。
****************************************************************************/
switch (ssd->parameter->static_allocation)
{
case 0: //no striping static allocation
{
sub_req->location->channel=(sub_req->lpn/(plane_num*die_num*chip_num))%channel_num;
sub_req->location->chip=sub_req->lpn%chip_num;
sub_req->location->die=(sub_req->lpn/chip_num)%die_num;
sub_req->location->plane=(sub_req->lpn/(die_num*chip_num))%plane_num;
break;
}
case 1:
{
sub_req->location->channel=sub_req->lpn%channel_num;
sub_req->location->chip=(sub_req->lpn/channel_num)%chip_num;
sub_req->location->die=(sub_req->lpn/(chip_num*channel_num))%die_num;
sub_req->location->plane=(sub_req->lpn/(die_num*chip_num*channel_num))%plane_num;
break;
}
case 2:
{
sub_req->location->channel=sub_req->lpn%channel_num;
sub_req->location->chip=(sub_req->lpn/(plane_num*channel_num))%chip_num;
sub_req->location->die=(sub_req->lpn/(plane_num*chip_num*channel_num))%die_num;
sub_req->location->plane=(sub_req->lpn/channel_num)%plane_num;
break;
}
case 3:
{
sub_req->location->channel=sub_req->lpn%channel_num;
sub_req->location->chip=(sub_req->lpn/(die_num*channel_num))%chip_num;
sub_req->location->die=(sub_req->lpn/channel_num)%die_num;
sub_req->location->plane=(sub_req->lpn/(die_num*chip_num*channel_num))%plane_num;
break;
}
case 4:
{
sub_req->location->channel=sub_req->lpn%channel_num;
sub_req->location->chip=(sub_req->lpn/(plane_num*die_num*channel_num))%chip_num;
sub_req->location->die=(sub_req->lpn/(plane_num*channel_num))%die_num;
sub_req->location->plane=(sub_req->lpn/channel_num)%plane_num;
break;
}
case 5:
{
sub_req->location->channel=sub_req->lpn%channel_num;
sub_req->location->chip=(sub_req->lpn/(plane_num*die_num*channel_num))%chip_num;
sub_req->location->die=(sub_req->lpn/channel_num)%die_num;
sub_req->location->plane=(sub_req->lpn/(die_num*channel_num))%plane_num;
break;
}
default : return ERROR;
}
if (ssd->dram->map->map_entry[sub_req->lpn].state!=0)
{ /*这个写回的子请求的逻辑页不可以覆盖之前被写回的数据 需要产生读请求*/
if ((sub_req->state&ssd->dram->map->map_entry[sub_req->lpn].state)!=ssd->dram->map->map_entry[sub_req->lpn].state)
{
ssd->read_count++;
ssd->update_read_count++;
update=(struct sub_request *)malloc(sizeof(struct sub_request));
alloc_assert(update,"update");
memset(update,0, sizeof(struct sub_request));
if(update==NULL)
{
return ERROR;
}
update->location=NULL;
update->next_node=NULL;
update->next_subs=NULL;
update->update=NULL;
location = find_location(ssd,ssd->dram->map->map_entry[sub_req->lpn].pn);
update->location=location;
update->begin_time = ssd->current_time;
update->current_state = SR_WAIT;
update->current_time=MAX_INT64;
update->next_state = SR_R_C_A_TRANSFER;
update->next_state_predict_time=MAX_INT64;
update->lpn = sub_req->lpn;
update->state=((ssd->dram->map->map_entry[sub_req->lpn].state^sub_req->state)&0x7fffffff);
update->size=size(update->state);
update->ppn = ssd->dram->map->map_entry[sub_req->lpn].pn;
update->operation = READ;
if (ssd->channel_head[location->channel].subs_r_tail!=NULL)
{
ssd->channel_head[location->channel].subs_r_tail->next_node=update;
ssd->channel_head[location->channel].subs_r_tail=update;
}
else
{
ssd->channel_head[location->channel].subs_r_tail=update;
ssd->channel_head[location->channel].subs_r_head=update;
}
}
if (update!=NULL)
{
sub_req->update=update;
sub_req->state=(sub_req->state|update->state);
sub_req->size=size(sub_req->state);
}
}
}
if ((ssd->parameter->allocation_scheme!=0)||(ssd->parameter->dynamic_allocation!=0))
{
if (ssd->channel_head[sub_req->location->channel].subs_w_tail!=NULL)
{
ssd->channel_head[sub_req->location->channel].subs_w_tail->next_node=sub_req;
ssd->channel_head[sub_req->location->channel].subs_w_tail=sub_req;
}
else
{
ssd->channel_head[sub_req->location->channel].subs_w_tail=sub_req;
ssd->channel_head[sub_req->location->channel].subs_w_head=sub_req;
}
}
return SUCCESS;
}
/*******************************************************************************
*insert2buffer这个函数是专门为写请求分配子请求服务的在buffer_management中被调用。
********************************************************************************/
struct ssd_info * insert2buffer(struct ssd_info *ssd,unsigned int lpn,int state,struct sub_request *sub,struct request *req)
{
int write_back_count,flag=0; /*flag表示为写入新数据腾空间是否完成，0表示需要进一步腾，1表示已经腾空*/
unsigned int i,lsn,hit_flag,add_flag,sector_count,active_region_flag=0,free_sector=0;
struct buffer_group *buffer_node=NULL,*pt,*new_node=NULL,key;
struct sub_request *sub_req=NULL,*update=NULL;
unsigned int sub_req_state=0, sub_req_size=0,sub_req_lpn=0;
#ifdef DEBUG
printf("enter insert2buffer, current time:%lld, lpn:%d, state:%d,\n",ssd->current_time,lpn,state);
#endif
sector_count=size(state); /*需要写到buffer的sector个数*/
key.group=lpn;
buffer_node= (struct buffer_group*)avlTreeFind(ssd->dram->buffer, (TREE_NODE *)&key); /*在平衡二叉树中寻找buffer node*/
/************************************************************************************************
*没有命中。
*第一步根据这个lpn有多少子页需要写到buffer，去除已写回的lsn，为该lpn腾出位置，
*首先即要计算出free sector（表示还有多少可以直接写的buffer节点）。
*如果free_sector>=sector_count，即有多余的空间够lpn子请求写，不需要产生写回请求
*否则，没有多余的空间供lpn子请求写，这时需要释放一部分空间，产生写回请求。就要creat_sub_request()
*************************************************************************************************/
if(buffer_node==NULL)
{
free_sector=ssd->dram->buffer->max_buffer_sector-ssd->dram->buffer->buffer_sector_count;
if(free_sector>=sector_count)
{
flag=1;
}
if(flag==0)
{
write_back_count=sector_count-free_sector;
ssd->dram->buffer->write_miss_hit=ssd->dram->buffer->write_miss_hit+write_back_count;
while(write_back_count>0)
{
sub_req=NULL;
sub_req_state=ssd->dram->buffer->buffer_tail->stored;
sub_req_size=size(ssd->dram->buffer->buffer_tail->stored);
sub_req_lpn=ssd->dram->buffer->buffer_tail->group;
sub_req=creat_sub_request(ssd,sub_req_lpn,sub_req_size,sub_req_state,req,WRITE);
/**********************************************************************************
*req不为空，表示这个insert2buffer函数是在buffer_management中调用，传递了request进来
*req为空，表示这个函数是在process函数中处理一对多映射关系的读的时候，需要将这个读出
*的数据加到buffer中，这可能产生实时的写回操作，需要将这个实时的写回操作的子请求挂在
*这个读请求的总请求上
***********************************************************************************/
if(req!=NULL)
{
}
else
{
sub_req->next_subs=sub->next_subs;
sub->next_subs=sub_req;
}
/*********************************************************************
*写请求插入到了平衡二叉树，这时就要修改dram的buffer_sector_count；
*维持平衡二叉树调用avlTreeDel()和AVL_TREENODE_FREE()函数；维持LRU算法；
**********************************************************************/
ssd->dram->buffer->buffer_sector_count=ssd->dram->buffer->buffer_sector_count-sub_req->size;
pt = ssd->dram->buffer->buffer_tail;
avlTreeDel(ssd->dram->buffer, (TREE_NODE *) pt);
if(ssd->dram->buffer->buffer_head->LRU_link_next == NULL){
ssd->dram->buffer->buffer_head = NULL;
ssd->dram->buffer->buffer_tail = NULL;
}else{
ssd->dram->buffer->buffer_tail=ssd->dram->buffer->buffer_tail->LRU_link_pre;
ssd->dram->buffer->buffer_tail->LRU_link_next=NULL;
}
pt->LRU_link_next=NULL;
pt->LRU_link_pre=NULL;
AVL_TREENODE_FREE(ssd->dram->buffer, (TREE_NODE *) pt);
pt = NULL;
write_back_count=write_back_count-sub_req->size; /*因为产生了实时写回操作，需要将主动写回操作区域增加*/
}
}
/******************************************************************************
*生成一个buffer node，根据这个页的情况分别赋值个各个成员，添加到队首和二叉树中
*******************************************************************************/
new_node=NULL;
new_node=(struct buffer_group *)malloc(sizeof(struct buffer_group));
alloc_assert(new_node,"buffer_group_node");
memset(new_node,0, sizeof(struct buffer_group));
new_node->group=lpn;
new_node->stored=state;
new_node->dirty_clean=state;
new_node->LRU_link_pre = NULL;
new_node->LRU_link_next=ssd->dram->buffer->buffer_head;
if(ssd->dram->buffer->buffer_head != NULL){
ssd->dram->buffer->buffer_head->LRU_link_pre=new_node;
}else{
ssd->dram->buffer->buffer_tail = new_node;
}
ssd->dram->buffer->buffer_head=new_node;
new_node->LRU_link_pre=NULL;
avlTreeAdd(ssd->dram->buffer, (TREE_NODE *) new_node);
ssd->dram->buffer->buffer_sector_count += sector_count;
}
/****************************************************************************************
*在buffer中命中的情况
*算然命中了，但是命中的只是lpn，有可能新来的写请求，只是需要写lpn这一page的某几个sub_page
*这时有需要进一步的判断
*****************************************************************************************/
else
{
for(i=0;i<ssd->parameter->subpage_page;i++)
{
/*************************************************************
*判断state第i位是不是1
*并且判断第i个sector是否存在buffer中，1表示存在，0表示不存在。
**************************************************************/
if((state>>i)%2!=0)
{
lsn=lpn*ssd->parameter->subpage_page+i;
hit_flag=0;
hit_flag=(buffer_node->stored)&(0x00000001<<i);
if(hit_flag!=0) /*命中了，需要将该节点移到buffer的队首，并且将命中的lsn进行标记*/
{
active_region_flag=1; /*用来记录在这个buffer node中的lsn是否被命中，用于后面对阈值的判定*/
if(req!=NULL)
{
if(ssd->dram->buffer->buffer_head!=buffer_node)
{
if(ssd->dram->buffer->buffer_tail==buffer_node)
{
ssd->dram->buffer->buffer_tail=buffer_node->LRU_link_pre;
buffer_node->LRU_link_pre->LRU_link_next=NULL;
}
else if(buffer_node != ssd->dram->buffer->buffer_head)
{
buffer_node->LRU_link_pre->LRU_link_next=buffer_node->LRU_link_next;
buffer_node->LRU_link_next->LRU_link_pre=buffer_node->LRU_link_pre;
}
buffer_node->LRU_link_next=ssd->dram->buffer->buffer_head;
ssd->dram->buffer->buffer_head->LRU_link_pre=buffer_node;
buffer_node->LRU_link_pre=NULL;
ssd->dram->buffer->buffer_head=buffer_node;
}
ssd->dram->buffer->write_hit++;
req->complete_lsn_count++; /*关键 当在buffer中命中时 就用req->complete_lsn_count++表示往buffer中写了数据。*/
}
else
{
}
}
else
{
/************************************************************************************************************
*该lsn没有命中，但是节点在buffer中，需要将这个lsn加到buffer的对应节点中
*从buffer的末端找一个节点，将一个已经写回的lsn从节点中删除(如果找到的话)，更改这个节点的状态，同时将这个新的
*lsn加到相应的buffer节点中，该节点可能在buffer头，不在的话，将其移到头部。如果没有找到已经写回的lsn，在buffer
*节点找一个group整体写回，将这个子请求挂在这个请求上。可以提前挂在一个channel上。
*第一步:将buffer队尾的已经写回的节点删除一个，为新的lsn腾出空间，这里需要修改队尾某节点的stored状态这里还需要
* 增加，当没有可以之间删除的lsn时，需要产生新的写子请求，写回LRU最后的节点。
*第二步:将新的lsn加到所述的buffer节点中。
*************************************************************************************************************/
ssd->dram->buffer->write_miss_hit++;
if(ssd->dram->buffer->buffer_sector_count>=ssd->dram->buffer->max_buffer_sector)
{
if (buffer_node==ssd->dram->buffer->buffer_tail) /*如果命中的节点是buffer中最后一个节点，交换最后两个节点*/
{
pt = ssd->dram->buffer->buffer_tail->LRU_link_pre;
ssd->dram->buffer->buffer_tail->LRU_link_pre=pt->LRU_link_pre;
ssd->dram->buffer->buffer_tail->LRU_link_pre->LRU_link_next=ssd->dram->buffer->buffer_tail;
ssd->dram->buffer->buffer_tail->LRU_link_next=pt;
pt->LRU_link_next=NULL;
pt->LRU_link_pre=ssd->dram->buffer->buffer_tail;
ssd->dram->buffer->buffer_tail=pt;
}
sub_req=NULL;
sub_req_state=ssd->dram->buffer->buffer_tail->stored;
sub_req_size=size(ssd->dram->buffer->buffer_tail->stored);
sub_req_lpn=ssd->dram->buffer->buffer_tail->group;
sub_req=creat_sub_request(ssd,sub_req_lpn,sub_req_size,sub_req_state,req,WRITE);
if(req!=NULL)
{
}
else if(req==NULL)
{
sub_req->next_subs=sub->next_subs;
sub->next_subs=sub_req;
}
ssd->dram->buffer->buffer_sector_count=ssd->dram->buffer->buffer_sector_count-sub_req->size;
pt = ssd->dram->buffer->buffer_tail;
avlTreeDel(ssd->dram->buffer, (TREE_NODE *) pt);
/************************************************************************/
/* 改: 挂在了子请求，buffer的节点不应立即删除， */
/* 需等到写回了之后才能删除 */
/************************************************************************/
if(ssd->dram->buffer->buffer_head->LRU_link_next == NULL)
{
ssd->dram->buffer->buffer_head = NULL;
ssd->dram->buffer->buffer_tail = NULL;
}else{
ssd->dram->buffer->buffer_tail=ssd->dram->buffer->buffer_tail->LRU_link_pre;
ssd->dram->buffer->buffer_tail->LRU_link_next=NULL;
}
pt->LRU_link_next=NULL;
pt->LRU_link_pre=NULL;
AVL_TREENODE_FREE(ssd->dram->buffer, (TREE_NODE *) pt);
pt = NULL;
}
/*第二步:将新的lsn加到所述的buffer节点中*/
add_flag=0x00000001<<(lsn%ssd->parameter->subpage_page);
if(ssd->dram->buffer->buffer_head!=buffer_node) /*如果该buffer节点不在buffer的队首，需要将这个节点提到队首*/
{
if(ssd->dram->buffer->buffer_tail==buffer_node)
{
buffer_node->LRU_link_pre->LRU_link_next=NULL;
ssd->dram->buffer->buffer_tail=buffer_node->LRU_link_pre;
}
else
{
buffer_node->LRU_link_pre->LRU_link_next=buffer_node->LRU_link_next;
buffer_node->LRU_link_next->LRU_link_pre=buffer_node->LRU_link_pre;
}
buffer_node->LRU_link_next=ssd->dram->buffer->buffer_head;
ssd->dram->buffer->buffer_head->LRU_link_pre=buffer_node;
buffer_node->LRU_link_pre=NULL;
ssd->dram->buffer->buffer_head=buffer_node;
}
buffer_node->stored=buffer_node->stored|add_flag;
buffer_node->dirty_clean=buffer_node->dirty_clean|add_flag;
ssd->dram->buffer->buffer_sector_count++;
}
}
}
}
return ssd;
}
/**************************************************************************************
*函数的功能是寻找活跃快，应为每个plane中都只有一个活跃块，只有这个活跃块中才能进行操作
***************************************************************************************/
Status find_active_block(struct ssd_info *ssd,unsigned int channel,unsigned int chip,unsigned int die,unsigned int plane)
{
unsigned int active_block;
unsigned int free_page_num=0;
unsigned int count=0;
active_block=ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].active_block;
free_page_num=ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].blk_head[active_block].free_page_num;
//last_write_page=ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].blk_head[active_block].free_page_num;
while((free_page_num==0)&&(count<ssd->parameter->block_plane))
{
active_block=(active_block+1)%ssd->parameter->block_plane;
free_page_num=ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].blk_head[active_block].free_page_num;
count++;
}
ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].active_block=active_block;
if(count<ssd->parameter->block_plane)
{
return SUCCESS;
}
else
{
return FAILURE;
}
}
/*************************************************
*这个函数的功能就是一个模拟一个实实在在的写操作
*就是更改这个page的相关参数，以及整个ssd的统计参数
**************************************************/
Status write_page(struct ssd_info *ssd,unsigned int channel,unsigned int chip,unsigned int die,unsigned int plane,unsigned int active_block,unsigned int *ppn)
{
int last_write_page=0;
last_write_page=++(ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].blk_head[active_block].last_write_page);
if(last_write_page>=(int)(ssd->parameter->page_block))
{
ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].blk_head[active_block].last_write_page=0;
printf("error! the last write page larger than 64!!\n");
return ERROR;
}
ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].blk_head[active_block].free_page_num--;
ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].free_page--;
ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].blk_head[active_block].page_head[last_write_page].written_count++;
ssd->write_flash_count++;
*ppn=find_ppn(ssd,channel,chip,die,plane,active_block,last_write_page);
return SUCCESS;
}
/**********************************************
*这个函数的功能是根据lpn，size，state创建子请求
**********************************************/
struct sub_request * creat_sub_request(struct ssd_info * ssd,unsigned int lpn,int size,unsigned int state,struct request * req,unsigned int operation)
{
struct sub_request* sub=NULL,* sub_r=NULL;
struct channel_info * p_ch=NULL;
struct local * loc=NULL;
unsigned int flag=0;
sub = (struct sub_request*)malloc(sizeof(struct sub_request)); /*申请一个子请求的结构*/
alloc_assert(sub,"sub_request");
memset(sub,0, sizeof(struct sub_request));
if(sub==NULL)
{
return NULL;
}
sub->location=NULL;
sub->next_node=NULL;
sub->next_subs=NULL;
sub->update=NULL;
if(req!=NULL)
{
sub->next_subs = req->subs;
req->subs = sub;
}
/*************************************************************************************
*在读操作的情况下，有一点非常重要就是要预先判断读子请求队列中是否有与这个子请求相同的，
*有的话，新子请求就不必再执行了，将新的子请求直接赋为完成
**************************************************************************************/
if (operation == READ)
{
loc = find_location(ssd,ssd->dram->map->map_entry[lpn].pn);
sub->location=loc;
sub->begin_time = ssd->current_time;
sub->current_state = SR_WAIT;
sub->current_time=MAX_INT64;
sub->next_state = SR_R_C_A_TRANSFER;
sub->next_state_predict_time=MAX_INT64;
sub->lpn = lpn;
sub->size=size; /*需要计算出该子请求的请求大小*/
p_ch = &ssd->channel_head[loc->channel];
sub->ppn = ssd->dram->map->map_entry[lpn].pn;
sub->operation = READ;
sub->state=(ssd->dram->map->map_entry[lpn].state&0x7fffffff);
sub_r=p_ch->subs_r_head; /*一下几行包括flag用于判断该读子请求队列中是否有与这个子请求相同的，有的话，将新的子请求直接赋为完成*/
flag=0;
while (sub_r!=NULL)
{
if (sub_r->ppn==sub->ppn)
{
flag=1;
break;
}
sub_r=sub_r->next_node;
}
if (flag==0)
{
if (p_ch->subs_r_tail!=NULL)
{
p_ch->subs_r_tail->next_node=sub;
p_ch->subs_r_tail=sub;
}
else
{
p_ch->subs_r_head=sub;
p_ch->subs_r_tail=sub;
}
}
else
{
sub->current_state = SR_R_DATA_TRANSFER;
sub->current_time=ssd->current_time;
sub->next_state = SR_COMPLETE;
sub->next_state_predict_time=ssd->current_time+1000;
sub->complete_time=ssd->current_time+1000;
}
}
/*************************************************************************************
*写请求的情况下，就需要利用到函数allocate_location(ssd ,sub)来处理静态分配和动态分配了
**************************************************************************************/
else if(operation == WRITE)
{
sub->ppn=0;
sub->operation = WRITE;
sub->location=(struct local *)malloc(sizeof(struct local));
alloc_assert(sub->location,"sub->location");
memset(sub->location,0, sizeof(struct local));
sub->current_state=SR_WAIT;
sub->current_time=ssd->current_time;
sub->lpn=lpn;
sub->size=size;
sub->state=state;
sub->begin_time=ssd->current_time;
if (allocate_location(ssd ,sub)==ERROR)
{
free(sub->location);
sub->location=NULL;
free(sub);
sub=NULL;
return NULL;
}
}
else
{
free(sub->location);
sub->location=NULL;
free(sub);
sub=NULL;
printf("\nERROR ! Unexpected command.\n");
return NULL;
}
return sub;
}
/******************************************************
*函数的功能是在给出的channel，chip，die上面寻找读子请求
*这个子请求的ppn要与相应的plane的寄存器里面的ppn相符
*******************************************************/
struct sub_request * find_read_sub_request(struct ssd_info * ssd, unsigned int channel, unsigned int chip, unsigned int die)
{
unsigned int plane=0;
unsigned int address_ppn=0;
struct sub_request *sub=NULL,* p=NULL;
for(plane=0;plane<ssd->parameter->plane_die;plane++)
{
address_ppn=ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[plane].add_reg_ppn;
if(address_ppn!=-1)
{
sub=ssd->channel_head[channel].subs_r_head;
if(sub->ppn==address_ppn)
{
if(sub->next_node==NULL)
{
ssd->channel_head[channel].subs_r_head=NULL;
ssd->channel_head[channel].subs_r_tail=NULL;
}
ssd->channel_head[channel].subs_r_head=sub->next_node;
}
while((sub->ppn!=address_ppn)&&(sub->next_node!=NULL))
{
if(sub->next_node->ppn==address_ppn)
{
p=sub->next_node;
if(p->next_node==NULL)
{
sub->next_node=NULL;
ssd->channel_head[channel].subs_r_tail=sub;
}
else
{
sub->next_node=p->next_node;
}
sub=p;
break;
}
sub=sub->next_node;
}
if(sub->ppn==address_ppn)
{
sub->next_node=NULL;
return sub;
}
else
{
printf("Error! Can't find the sub request.");
}
}
}
return NULL;
}
/*******************************************************************************
*函数的功能是寻找写子请求。
*分两种情况1，要是是完全动态分配就在ssd->subs_w_head队列上找
*2，要是不是完全动态分配那么就在ssd->channel_head[channel].subs_w_head队列上查找
********************************************************************************/
struct sub_request * find_write_sub_request(struct ssd_info * ssd, unsigned int channel)
{
struct sub_request * sub=NULL,* p=NULL;
if ((ssd->parameter->allocation_scheme==0)&&(ssd->parameter->dynamic_allocation==0)) /*是完全的动态分配*/
{
sub=ssd->subs_w_head;
while(sub!=NULL)
{
if(sub->current_state==SR_WAIT)
{
if (sub->update!=NULL) /*如果有需要提前读出的页*/
{
if ((sub->update->current_state==SR_COMPLETE)||((sub->update->next_state==SR_COMPLETE)&&(sub->update->next_state_predict_time<=ssd->current_time))) //被更新的页已经被读出
{
break;
}
}
else
{
break;
}
}
p=sub;
sub=sub->next_node;
}
if (sub==NULL) /*如果没有找到可以服务的子请求，跳出这个for循环*/
{
return NULL;
}
if (sub!=ssd->subs_w_head)
{
if (sub!=ssd->subs_w_tail)
{
p->next_node=sub->next_node;
}
else
{
ssd->subs_w_tail=p;
ssd->subs_w_tail->next_node=NULL;
}
}
else
{
if (sub->next_node!=NULL)
{
ssd->subs_w_head=sub->next_node;
}
else
{
ssd->subs_w_head=NULL;
ssd->subs_w_tail=NULL;
}
}
sub->next_node=NULL;
if (ssd->channel_head[channel].subs_w_tail!=NULL)
{
ssd->channel_head[channel].subs_w_tail->next_node=sub;
ssd->channel_head[channel].subs_w_tail=sub;
}
else
{
ssd->channel_head[channel].subs_w_tail=sub;
ssd->channel_head[channel].subs_w_head=sub;
}
}
/**********************************************************
*除了全动态分配方式，其他方式的请求已经分配到特定的channel，
*就只需要在channel上找出准备服务的子请求
***********************************************************/
else
{
sub=ssd->channel_head[channel].subs_w_head;
while(sub!=NULL)
{
if(sub->current_state==SR_WAIT)
{
if (sub->update!=NULL)
{
if ((sub->update->current_state==SR_COMPLETE)||((sub->update->next_state==SR_COMPLETE)&&(sub->update->next_state_predict_time<=ssd->current_time))) //被更新的页已经被读出
{
break;
}
}
else
{
break;
}
}
p=sub;
sub=sub->next_node;
}
if (sub==NULL)
{
return NULL;
}
}
return sub;
}
/*********************************************************************************************
*专门为读子请求服务的函数
*1，只有当读子请求的当前状态是SR_R_C_A_TRANSFER
*2，读子请求的当前状态是SR_COMPLETE或者下一状态是SR_COMPLETE并且下一状态到达的时间比当前时间小
**********************************************************************************************/
Status services_2_r_cmd_trans_and_complete(struct ssd_info * ssd)
{
unsigned int i=0;
struct sub_request * sub=NULL, * p=NULL;
for(i=0;i<ssd->parameter->channel_number;i++) /*这个循环处理不需要channel的时间(读命令已经到达chip，chip由ready变为busy)，当读请求完成时，将其从channel的队列中取出*/
{
sub=ssd->channel_head[i].subs_r_head;
while(sub!=NULL)
{
if(sub->current_state==SR_R_C_A_TRANSFER) /*读命令发送完毕，将对应的die置为busy，同时修改sub的状态; 这个部分专门处理读请求由当前状态为传命令变为die开始busy，die开始busy不需要channel为空，所以单独列出*/
{
if(sub->next_state_predict_time<=ssd->current_time)
{
go_one_step(ssd, sub,NULL, SR_R_READ,NORMAL); /*状态跳变处理函数*/
}
}
else if((sub->current_state==SR_COMPLETE)||((sub->next_state==SR_COMPLETE)&&(sub->next_state_predict_time<=ssd->current_time)))
{
if(sub!=ssd->channel_head[i].subs_r_head) /*if the request is completed, we delete it from read queue */
{
p->next_node=sub->next_node;
}
else
{
if (ssd->channel_head[i].subs_r_head!=ssd->channel_head[i].subs_r_tail)
{
ssd->channel_head[i].subs_r_head=sub->next_node;
}
else
{
ssd->channel_head[i].subs_r_head=NULL;
ssd->channel_head[i].subs_r_tail=NULL;
}
}
}
p=sub;
sub=sub->next_node;
}
}
return SUCCESS;
}
/**************************************************************************
*这个函数也是只处理读子请求，处理chip当前状态是CHIP_WAIT，
*或者下一个状态是CHIP_DATA_TRANSFER并且下一状态的预计时间小于当前时间的chip
***************************************************************************/
Status services_2_r_data_trans(struct ssd_info * ssd,unsigned int channel,unsigned int * channel_busy_flag, unsigned int * change_current_time_flag)
{
int chip=0;
unsigned int die=0,plane=0,address_ppn=0,die1=0;
struct sub_request * sub=NULL, * p=NULL,*sub1=NULL;
struct sub_request * sub_twoplane_one=NULL, * sub_twoplane_two=NULL;
struct sub_request * sub_interleave_one=NULL, * sub_interleave_two=NULL;
for(chip=0;chip<ssd->channel_head[channel].chip;chip++)
{
if((ssd->channel_head[channel].chip_head[chip].current_state==CHIP_WAIT)||((ssd->channel_head[channel].chip_head[chip].next_state==CHIP_DATA_TRANSFER)&&
(ssd->channel_head[channel].chip_head[chip].next_state_predict_time<=ssd->current_time)))
{
for(die=0;die<ssd->parameter->die_chip;die++)
{
sub=find_read_sub_request(ssd,channel,chip,die); /*在channel,chip,die中找到读子请求*/
if(sub!=NULL)
{
break;
}
}
if(sub==NULL)
{
continue;
}
/**************************************************************************************
*如果ssd支持高级命令，那没我们可以一起处理支持AD_TWOPLANE_READ，AD_INTERLEAVE的读子请求
*1，有可能产生了two plane操作，在这种情况下，将同一个die上的两个plane的数据依次传出
*2，有可能产生了interleave操作，在这种情况下，将不同die上的两个plane的数据依次传出
***************************************************************************************/
if(((ssd->parameter->advanced_commands&AD_TWOPLANE_READ)==AD_TWOPLANE_READ)||((ssd->parameter->advanced_commands&AD_INTERLEAVE)==AD_INTERLEAVE))
{
if ((ssd->parameter->advanced_commands&AD_TWOPLANE_READ)==AD_TWOPLANE_READ) /*有可能产生了two plane操作，在这种情况下，将同一个die上的两个plane的数据依次传出*/
{
sub_twoplane_one=sub;
sub_twoplane_two=NULL;
/*为了保证找到的sub_twoplane_two与sub_twoplane_one不同，令add_reg_ppn=-1*/
ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[sub->location->plane].add_reg_ppn=-1;
sub_twoplane_two=find_read_sub_request(ssd,channel,chip,die); /*在相同的channel,chip,die中寻找另外一个读子请求*/
/******************************************************
*如果找到了那么就执行TWO_PLANE的状态转换函数go_one_step
*如果没找到那么就执行普通命令的状态转换函数go_one_step
******************************************************/
if (sub_twoplane_two==NULL)
{
go_one_step(ssd, sub_twoplane_one,NULL, SR_R_DATA_TRANSFER,NORMAL);
*change_current_time_flag=0;
*channel_busy_flag=1;
}
else
{
go_one_step(ssd, sub_twoplane_one,sub_twoplane_two, SR_R_DATA_TRANSFER,TWO_PLANE);
*change_current_time_flag=0;
*channel_busy_flag=1;
}
}
else if ((ssd->parameter->advanced_commands&AD_INTERLEAVE)==AD_INTERLEAVE) /*有可能产生了interleave操作，在这种情况下，将不同die上的两个plane的数据依次传出*/
{
sub_interleave_one=sub;
sub_interleave_two=NULL;
ssd->channel_head[channel].chip_head[chip].die_head[die].plane_head[sub->location->plane].add_reg_ppn=-1;
for(die1=0;die1<ssd->parameter->die_chip;die1++)
{
if(die1!=die)
{
sub_interleave_two=find_read_sub_request(ssd,channel,chip,die1); /*在相同的channel，chhip不同的die上面找另外一个读子请求*/
if(sub_interleave_two!=NULL)
{