static void sbd_request_func(struct request_queue *q)
{
struct request *req;
while((req = blk_fetch_request(q)) != NULL)
{
if (req->cmd_type != REQ_TYPE_FS) {
printk (KERN_NOTICE "Skip non-fs request\n");
__blk_end_request_cur(req, -EIO);
continue;
}
if (((blk_rq_pos(req) << 9) + blk_rq_bytes(req)) > SBD_BYTES) {
printk (KERN_INFO "out of disk boundary\n");
__blk_end_request_cur(req, -EIO);
break;
}
printk (KERN_INFO "%s, rq_pos << 9 = %lu, rq_bytes = %lu\n",
(rq_data_dir(req) == WRITE) ? "WRITE" : "READ",
(unsigned long)(blk_rq_pos(req) << 9),
(unsigned long)blk_rq_bytes(req));
if(rq_data_dir(req) == WRITE)
memcpy(sbd_data + (blk_rq_pos(req) << 9), req->buffer,
blk_rq_bytes(req));
else
memcpy(req->buffer, sbd_data + (blk_rq_pos(req) << 9),
blk_rq_bytes(req));
__blk_end_request_cur(req, 0);
}
}
static int stheno_request_thread( void *arg )
{
struct request *req;
int ret;
while( 1 ){
ret = wait_event_interruptible( stheno_wait_q, (kthread_should_stop() || stheno_wakeup == 1) );
if( ret != 0 ) break;
stheno_wakeup = 0;
if( kthread_should_stop() ) break;
while( 1 ){
spin_lock_irq( stheno_queue->queue_lock );
req = blk_fetch_request( stheno_queue );
spin_unlock_irq( stheno_queue->queue_lock );
next_segment:
if( req == NULL ) break;
if( !blk_fs_request( req ) ){
/*blk_end_request_cur( req, -EIO );*/
spin_lock_irq( stheno_queue->queue_lock );
ret = __blk_end_request_cur( req, -EIO );
spin_unlock_irq( stheno_queue->queue_lock );
if( ret == true ) goto next_segment;
continue;
}
if( stheno_read_sector0() != 0 ){
spin_lock_irq( stheno_queue->queue_lock );
ret = __blk_end_request_cur( req, -EIO );
spin_unlock_irq( stheno_queue->queue_lock );
if( ret == true ) goto next_segment;
continue;
}
if( blk_rq_sectors( req ) == 0 || blk_rq_cur_sectors( req ) == 0 ){
spin_lock_irq( stheno_queue->queue_lock );
ret = __blk_end_request_cur( req, -EIO );
spin_unlock_irq( stheno_queue->queue_lock );
if( ret == true ) goto next_segment;
continue;
}
if( rq_data_dir( req ) == 0 ){
ret = euryale_read_process( stheno_lbaoffset + blk_rq_pos( req ), blk_rq_cur_sectors( req ), req->buffer );
}else{
ret = euryale_write_process( stheno_lbaoffset + blk_rq_pos( req ), blk_rq_cur_sectors( req ), req->buffer );
}
/*blk_end_request_cur( req, ret == 0 ? 0 : -EIO );*/
spin_lock_irq( stheno_queue->queue_lock );
ret = __blk_end_request_cur( req, ret == 0 ? 0 : -EIO );
spin_unlock_irq( stheno_queue->queue_lock );
if( ret == true ) goto next_segment;
}
}
print_debug("stheno_request_thread was terminated.\n");
return 0;
}
/*
* The simple form of the request function.
*/
static void sbull_request(struct request_queue *q)
{
struct request *req;
int ret;
req = blk_fetch_request(q);
while (req) {
struct sbull_dev *dev = req->rq_disk->private_data;
if (req->cmd_type != REQ_TYPE_FS) {
printk (KERN_NOTICE "Skip non-fs request\n");
ret = -EIO;
goto done;
}
printk (KERN_NOTICE "Req dev %u dir %d sec %ld, nr %d\n",
(unsigned)(dev - Devices), rq_data_dir(req),
blk_rq_pos(req), blk_rq_cur_sectors(req));
sbull_transfer(dev, blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req));
ret = 0;
done:
if(!__blk_end_request_cur(req, ret)){
req = blk_fetch_request(q);
}
}
}
static void htifblk_request(struct request_queue *q)
{
struct htifblk_device *dev;
struct request *req;
unsigned long flags;
int ret;
dev = q->queuedata;
spin_lock_irqsave(q->queue_lock, flags);
if (dev->req != NULL)
goto out;
while ((req = blk_fetch_request(q)) != NULL) {
if (req->cmd_type == REQ_TYPE_FS) {
ret = htifblk_segment(dev, req);
if (unlikely(ret)) {
WARN_ON(__blk_end_request_cur(req, ret));
continue;
}
blk_stop_queue(q);
break;
} else {
blk_dump_rq_flags(req, DRIVER_NAME
": ignored non-fs request");
__blk_end_request_all(req, -EIO);
continue;
}
}
out:
spin_unlock_irqrestore(q->queue_lock, flags);
}
static irqreturn_t htifblk_isr(struct htif_device *dev, unsigned long data)
{
struct htifblk_device *htifblk_dev;
unsigned int tag;
irqreturn_t ret;
int err;
htifblk_dev = dev_get_drvdata(&dev->dev);
ret = IRQ_NONE;
spin_lock(&htifblk_dev->lock);
if (unlikely(htifblk_dev->req == NULL)) {
dev_err(&dev->dev, "null request\n");
goto out;
}
err = 0;
tag = (data << HTIF_DEV_SHIFT) >> HTIF_DEV_SHIFT;
if (unlikely(tag != htifblk_dev->tag)) {
dev_err(&dev->dev, "tag mismatch: expected=%u actual=%u\n",
htifblk_dev->tag, tag);
err = -EIO;
}
wmb();
WARN_ON(__blk_end_request_cur(htifblk_dev->req, err));
htifblk_dev->req = NULL;
blk_start_queue(htifblk_dev->disk->queue);
ret = IRQ_HANDLED;
out:
spin_unlock(&htifblk_dev->lock);
return ret;
}
static void do_z2_request(struct request_queue *q)
{
struct request *req;
req = blk_fetch_request(q);
while (req) {
unsigned long start = blk_rq_pos(req) << 9;
unsigned long len = blk_rq_cur_bytes(req);
int err = 0;
if (start + len > z2ram_size) {
printk( KERN_ERR DEVICE_NAME ": bad access: block=%lu, count=%u\n",
blk_rq_pos(req), blk_rq_cur_sectors(req));
err = -EIO;
goto done;
}
while (len) {
unsigned long addr = start & Z2RAM_CHUNKMASK;
unsigned long size = Z2RAM_CHUNKSIZE - addr;
if (len < size)
size = len;
addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
if (rq_data_dir(req) == READ)
memcpy(req->buffer, (char *)addr, size);
else
memcpy((char *)addr, req->buffer, size);
start += size;
len -= size;
}
done:
if (!__blk_end_request_cur(req, err))
req = blk_fetch_request(q);
}
}
static void do_ramblock_request (struct request_queue * q)
{
static int cnt = 0;
struct request *req;
printk("do_ramblock_request: cnt = %d\n", ++cnt);
while ((req = blk_fetch_request(q)) != NULL) {
__blk_end_request_cur(req, 0);
#if 0
if (!__blk_end_request_cur(req, 0)) {
//req = blk_fetch_request(q);
}
#endif
}
}
static void do_ramblk_request(struct request_queue *q )
{
struct request *req;
// static volatile int r_cnt = 0;
// static volatile int w_cnt = 0;
//printk("ramblk_request_fn %d.\n",cnt++);
req = blk_fetch_request(q);
while (req) {
unsigned long start = blk_rq_pos(req) << 9;
unsigned long len = blk_rq_cur_bytes(req);
// printk("len=%d.\n",len);
if (start + len > RAMBLK_SIZE) {
printk("RAMBLK_SIZE< start+len");
goto done;
}
if (rq_data_dir(req) == READ)
memcpy(req->buffer, (char *)(start+ramblk_buf), len);
else
memcpy((char *)(start+ramblk_buf), req->buffer, len);
done:
if (!__blk_end_request_cur(req, 0))
req = blk_fetch_request(q);
}
}
void ramhd_req_func(struct request_queue* q) {
struct request* req;
RAMHD_DEV* pdev;
char* pData;
unsigned long addr, size, start;
req = blk_fetch_request(q);
while (req) {
start = blk_rq_pos(req); // The sector cursor of the current request
pdev = (RAMHD_DEV*)req->rq_disk->private_data;
pData = pdev->data;
addr = (unsigned long)pData + start * RAMHD_SECTOR_SIZE;
size = blk_rq_cur_bytes(req);
if (rq_data_dir(req) == READ) {
memcpy(req->buffer, (char*)addr, size);
} else {
memcpy((char*)addr, req->buffer, size);
}
if (!__blk_end_request_cur(req, 0)) {
req = blk_fetch_request(q);
}
}
}
static void simp_blkdev_do_request(struct request_queue *q)
{
struct request *req ;
req = blk_fetch_request(q);
while(req)
{
unsigned long start;
unsigned long len;
int err=0;
start =blk_rq_pos(req)<<9;
len =blk_rq_cur_sectors(req)<<9;
if(start + len >SIMP_BLKDEV_BYTES)
{
printk(KERN_ERR SIMP_BLKDEV_DISKNAME ":bad access:block=%lu,count=%u\n",blk_rq_pos(req), blk_rq_cur_sectors(req));
err = -EIO;
goto done;
}
if(rq_data_dir(req)==READ)
memcpy(req->buffer,simp_blkdev_data+start,len);
else
memcpy(simp_blkdev_data+start,req->buffer,len);
done:
if(!__blk_end_request_cur(req,err));
req =blk_fetch_request(q);
}
}
static irqreturn_t htifblk_isr(struct htif_device *dev, sbi_device_message *msg)
{
struct htifblk_device *htifblk_dev;
irqreturn_t ret;
int err;
htifblk_dev = dev_get_drvdata(&dev->dev);
ret = IRQ_NONE;
spin_lock(&htifblk_dev->lock);
if (unlikely(htifblk_dev->req == NULL)) {
dev_err(&dev->dev, "null request\n");
goto out;
}
err = 0;
if (unlikely(msg->data != htifblk_dev->tag)) {
dev_err(&dev->dev, "tag mismatch: expected=%u actual=%lu\n",
htifblk_dev->tag, msg->data);
err = -EIO;
}
wmb();
WARN_ON(__blk_end_request_cur(htifblk_dev->req, err));
htifblk_dev->req = NULL;
blk_start_queue(htifblk_dev->disk->queue);
ret = IRQ_HANDLED;
out:
spin_unlock(&htifblk_dev->lock);
return ret;
}
static void mini2440_ramdisk_request(struct request_queue *q)
{
static int r_cnt = 0;
static int w_cnt = 0;
struct request *req;
req = blk_fetch_request(q);
while (req) {
/* 数据传输三要素: 源,目的,长度 */
/* 源/目的: */
unsigned long offset = blk_rq_pos(req) << 9;
/* 长度: */
unsigned long len = blk_rq_cur_bytes(req);
if (rq_data_dir(req) == READ) {
printk("[RAMDISK]ramdisk_request read %d\n", ++r_cnt);
memcpy(req->buffer, mini2440_ramdisk_devp->ramdisk_buffer+offset, len);
}else {
printk("[RAMDISK]ramdisk_request write %d\n", ++w_cnt);
memcpy(mini2440_ramdisk_devp->ramdisk_buffer+offset, req->buffer, len);
}
if (!__blk_end_request_cur(req, 0))
req = blk_fetch_request(q);
else
printk("[RAMDISK]__blk_end_request_cur error!\n");
}
}
static void ramblock_do_request(struct request_queue * q)
{
struct request *req;
printk("do:ramblock_do_request\n");
req = blk_fetch_request(q);
while (req) {
/*源或目的*/
unsigned long offset = blk_rq_pos(req) * 512;
/*目的或源*/
//req->buffer
/*长度*/
unsigned long len = blk_rq_cur_bytes(req);
if (rq_data_dir(req) == READ)
memcpy(req->buffer, ram_buff+offset, len);
else
memcpy(ram_buff+offset, req->buffer, len);
/* wrap up, 0 = success, -errno = fail */
if (!__blk_end_request_cur(req, 0))
req = blk_fetch_request(q);
}
}
static void htifblk_request(struct request_queue *q)
{
struct htifblk_device *dev;
struct request *req;
int ret;
dev = q->queuedata;
if (dev->req != NULL)
return;
while ((req = blk_fetch_request(q)) != NULL) {
if (req->cmd_type == REQ_TYPE_FS) {
ret = htifblk_segment(dev, req);
if (unlikely(ret)) {
WARN_ON(__blk_end_request_cur(req, ret));
continue;
}
blk_stop_queue(q);
break;
} else {
blk_dump_rq_flags(req, DRIVER_NAME
": ignored non-fs request");
__blk_end_request_all(req, -EIO);
continue;
}
}
}
static void sbull_request(struct request_queue*q)
{
struct request *req;
while((req = blk_fetch_request(q)) != NULL)
{
struct sbull_dev *dev = req->rq_disk->private_data;
if(!blk_fs_request(req))
{
printk(KERN_NOTICE " Skip non-fs request\n");
__blk_end_request_cur(req, 0);
continue;
}
sbull_transfer(dev, blk_rq_pos(req), blk_rq_cur_sectors(req), req->buffer, rq_data_dir(req));
__blk_end_request_cur(req, 1);
}
}
/*
* The simple form of the request function.
*/
static void sbull_request(struct request_queue *q)
{
struct request *req;
while ((req = blk_fetch_request(q)) != NULL) {
struct sbull_dev *dev = req->rq_disk->private_data;
if (req->cmd_type != REQ_TYPE_FS) {
printk (KERN_NOTICE "Skip non-fs request\n");
__blk_end_request_cur(req, -EIO);
continue;
}
// printk (KERN_NOTICE "Req dev %d dir %ld sec %ld, nr %d f %lx\n",
// dev - Devices, rq_data_dir(req),
// req->sector, req->current_nr_sectors,
// req->flags);
sbull_transfer(dev, blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req));
__blk_end_request_cur(req, 0);
}
}
static void cf_request(struct request_queue *q)
{
struct cf_device *cf;
struct request *req;
unsigned block, count;
int rw, err;
DPRINTK(DEBUG_CF_REQUEST, "%s: q %p", __FUNCTION__, q);
req = blk_fetch_request(q);
while (req) {
err = -EIO;
DPRINTK(DEBUG_CF_REQUEST, "%s:%d req %p", __FUNCTION__, __LINE__, req);
if (!blk_fs_request(req))
goto done;
block = blk_rq_pos(req);
count = blk_rq_cur_sectors(req);
rw = rq_data_dir(req);
cf = req->rq_disk->private_data;
DPRINTK(DEBUG_CF_REQUEST, "req %p block %d count %d rw %c\n", req, block, count, (rw == READ)?'R':'W');
if (block+count > get_capacity(req->rq_disk)) {
printk("%s: %u+%u is larger than %llu\n", __FUNCTION__, block, count, get_capacity(req->rq_disk));
goto done;
}
/* Grab the R/W semaphore to prevent more than
* one request from trying to R/W at the same time */
err = down_interruptible(&cf->rw_sem);
if (err)
break;
if (rw == READ)
err = cf_read_sectors(cf, req->buffer, block, count);
else
err = cf_write_sectors(cf, req->buffer, block, count);
up(&cf->rw_sem);
done:
DPRINTK(DEBUG_CF_REQUEST, "%s: blk_end_request_cur(%p, %d)\n", __FUNCTION__, req, err);
if (!__blk_end_request_cur(req, err))
req = blk_fetch_request(q);
}
DPRINTK(DEBUG_CF_REQUEST, "end\n");
cf_in_request--;
}
/*
* Cette fonction permet de sélectionner une requête dans une file
* donnée (q) et de l'envoyer à la fonction sbd_transfert afin de la
* traiter.
* Une requête peut être composée de plusieurs "morceaux". Dans cette
* fonction, chaque "morceau" de la requête sera traité consécutivement
* jusqu'à ce que cette dernière soit traitée entièrement.
*/
static void sbd_request(struct request_queue *q) {
struct request *req; /* Instancie la requête */
req = blk_fetch_request(q); /* Sélection de la requête dans la file */
while (req != NULL) { /* Tant que la requête n'est pas nulle, i.e. file de requête n'est pas vide */
if (req == NULL || (req->cmd_type != REQ_TYPE_FS)) { /* Si requête nulle ou n'ayant pas le type "fs", i.e. s'il ne s'agit pas d'une requête liée au système de fichiers */
printk (KERN_NOTICE "Skip non-CMD request\n"); /* Inscription dans syslog de la non-exécution de la requête */
__blk_end_request_all(req, -EIO); /* Finition de la requête */
continue; /* Ignore les instructions suivantes et effectue un nouveau tour de boucle */
}
sbd_transfer(&Device, blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req)); /* Traitement de la requete */
if ( ! __blk_end_request_cur(req, 0) ) { /* Si la requete n'est pas complètement traitée */
req = blk_fetch_request(q); /* Sélectionne la suite de la requête dans la file */
}
}
}
/*
* Service each request in the queue. If the request
* is not a REQ_TYPE_FS type then just skip the request
* notifying that it is skipping this request.
*/
static void vbd_request(struct request_queue * q) {
struct request *req;
req = blk_fetch_request(q);
while(req != NULL) {
/* This should not happen normally but just in case */
if(req == NULL || (req->cmd_type != REQ_TYPE_FS)) {
printk(KERN_NOTICE "Skip non fs type request\n");
__blk_end_request_all(req, -EIO);
continue;
}
vbd_tx(&device,blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req));
if(!__blk_end_request_cur(req, 0))
req = blk_fetch_request(q);
}
}
static void my_request(struct request_queue *q)
{
struct request *rq;
int size, res = 0;
char *ptr;
unsigned nr_sectors, sector;
printk(KERN_INFO "entering request routine\n");
rq = blk_fetch_request(q);
while (rq) {
if (!blk_fs_request(rq)) {
printk(KERN_WARNING
"This was not a normal fs request, skipping\n");
goto done;
}
nr_sectors = blk_rq_cur_sectors(rq);
sector = blk_rq_pos(rq);
ptr = ramdisk + sector * sector_size;
size = nr_sectors * sector_size;
if ((ptr + size) > (ramdisk + disk_size)) {
printk(KERN_WARNING
" tried to go past end of device\n");
goto done;
}
if (rq_data_dir(rq)) {
printk(KERN_INFO "writing at sector %d, %u sectors \n",
sector, nr_sectors);
memcpy(ptr, rq->buffer, size);
} else {
printk(KERN_INFO "reading at sector %d, %u sectors \n",
sector, nr_sectors);
memcpy(rq->buffer, ptr, size);
}
done:
if (!__blk_end_request_cur(rq, res))
rq = blk_fetch_request(q);
}
printk(KERN_INFO "leaving request\n");
}
static void looper_request(struct request_queue *q) {
struct request *req;
printk(KERN_INFO "looper: executing request");
req = blk_fetch_request(q);
while (req != NULL) {
if (req == NULL || (req->cmd_type != REQ_TYPE_FS)) {
printk (KERN_NOTICE "Skip non-CMD request\n");
__blk_end_request_all(req, -EIO);
continue;
}
looper_transfer(&Device, blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req));
if ( ! __blk_end_request_cur(req, 0) ) {
req = blk_fetch_request(q);
}
}
}
/*
* Simply used for requesting a transfer (read or write) of
* data from the RAM disk.
*/
static void osurd_request(struct request_queue *q)
{
struct request *req;
req = blk_fetch_request(q);
while(req != NULL) {
struct osurd_dev *dev = req->rq_disk->private_data;
if(req->cmd_type != REQ_TYPE_FS) {
printk(KERN_NOTICE "Skip non-fs request\n");
__blk_end_request_all(req, -EIO);
continue;
}
osurd_transfer(dev, blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req)):
if(!__blk_end_request_cur(req, 0)) {
req = blk_fetch_request(q);
}
}
}
static void sbd_request(struct request_queue *q) {
struct request *req;
req = blk_fetch_request(q);
while (req != NULL) {
// blk_fs_request() was removed in 2.6.36 - many thanks to
// Christian Paro for the heads up and fix...
//if (!blk_fs_request(req)) {
if (req == NULL || (req->cmd_type != REQ_TYPE_FS)) {
printk (KERN_NOTICE "Skip non-CMD request\n");
__blk_end_request_all(req, -EIO);
continue;
}
sbd_transfer(&Device, blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req));
if ( ! __blk_end_request_cur(req, 0) ) {
req = blk_fetch_request(q);
}
}
}
static void sb_request(struct request_queue *q) {
struct request *req;
int error;
req = blk_fetch_request(q);
while (req != NULL) {
/* Check request type */
if (req == NULL || (req->cmd_type != REQ_TYPE_FS)) {
__blk_end_request_all(req, -EIO);
continue;
}
/* Do transfer */
error = sb_transfer(sbd, blk_rq_pos(req), blk_rq_cur_sectors(req), req->buffer, rq_data_dir(req));
if (!__blk_end_request_cur(req, error ? -EIO : 0) ) {
req = blk_fetch_request(q);
}
}
return;
}
static void sbd_request(struct request_queue *q) {
struct request *req;
unsigned long offset;
unsigned long nbytes;
req = blk_fetch_request(q);
while (req != NULL) {
if (req == NULL || (req->cmd_type != REQ_TYPE_FS)) {
printk (KERN_NOTICE "Skip non-CMD request\n");
__blk_end_request_all(req, -EIO);
continue;
}
offset = blk_rq_pos(req) * logical_block_size;
nbytes = blk_rq_cur_sectors(req) * logical_block_size;
operar_sector(&Device, offset, nbytes, req->buffer, rq_data_dir(req));
if ( ! __blk_end_request_cur(req, 0) ) {
req = blk_fetch_request(q);
}
}
}
//从请求队列上获取请求操作对象，从请求对象中获得操作参数：读写操作的起始sector和操作字节数，然后将所需的操作执行到硬件上去
//本函数是由blk驱动框架来自动调用的，调用时机由电梯算法调度决定
static void do_ldm_req(struct request_queue *q)
{
//从请求队列上获取一个请求对象
struct request *req = blk_fetch_request(q);
while (req) {
//从第几个扇区开始操作
u32 start = blk_rq_pos(req) * SECTOR_SIZE;
//获得当前请求操作的字节数
u32 len = blk_rq_cur_bytes(req);
//检查本次request操作是否越界
int err = 0;
if (start + len > DEV_SIZE) {
printk(KERN_ERR "request region is out of device capacity\n");
err = -EIO;
goto err_request;
}
//rq_data_dir获得当前请求的操作方向
//建议在memcpy前后加上打印语句，以便观察读写操作的调度时机
//数据从内核传输到应用
if (rq_data_dir(req) == READ) {
memcpy(req->buffer, (u8*)ldm.addr + start, len);
printk("read from %d, size %d\n", start, len);
} else { //数据从应用层传输到内核并写入
memcpy((u8*)ldm.addr + start, req->buffer, len);
printk("write from %d, size %d\n", start, len);
}
//__blk_end_request_cur：返回false表示当前req的所有操作都完成了，于是下面试图调用blk_fetch_request再从队列上获取新的请求，如果获取不到，则req得到NULL将退出循环；
//返回true的话说明当前req操作还没完成，继续循环执行
//err参数可以独立改变__blk_end_request_cur的返回值，err<0时，函数返回false。当发生其他错误时可以用err参数来结束当前req请求，从请求队列上获取新的请求
err_request:
if (!__blk_end_request_cur(req, err)) {
req = blk_fetch_request(q);
}
}
}
static void do_z2_request(struct request_queue *q)
{
struct request *req;
req = blk_fetch_request(q);
while (req) {
unsigned long start = blk_rq_pos(req) << 9;
unsigned long len = blk_rq_cur_bytes(req);
blk_status_t err = BLK_STS_OK;
if (start + len > z2ram_size) {
pr_err(DEVICE_NAME ": bad access: block=%llu, "
"count=%u\n",
(unsigned long long)blk_rq_pos(req),
blk_rq_cur_sectors(req));
err = BLK_STS_IOERR;
goto done;
}
while (len) {
unsigned long addr = start & Z2RAM_CHUNKMASK;
unsigned long size = Z2RAM_CHUNKSIZE - addr;
void *buffer = bio_data(req->bio);
if (len < size)
size = len;
addr += z2ram_map[ start >> Z2RAM_CHUNKSHIFT ];
if (rq_data_dir(req) == READ)
memcpy(buffer, (char *)addr, size);
else
memcpy((char *)addr, buffer, size);
start += size;
len -= size;
}
done:
if (!__blk_end_request_cur(req, err))
req = blk_fetch_request(q);
}
}
static void htifbd_request(struct request_queue *q)
{
struct request *req;
req = blk_fetch_request(q);
while (req != NULL) {
struct htifbd_dev *dev;
dev = req->rq_disk->private_data;
if (req->cmd_type != REQ_TYPE_FS) {
pr_notice(DRIVER_NAME ": ignoring non-fs request for %s\n",
req->rq_disk->disk_name);
__blk_end_request_all(req, -EIO);
continue;
}
htifbd_transfer(dev, blk_rq_pos(req), blk_rq_cur_sectors(req),
req->buffer, rq_data_dir(req));
if (!__blk_end_request_cur(req, 0)) {
req = blk_fetch_request(q);
}
}
}
static void ace_fsm_dostate(struct ace_device *ace)
{
struct request *req;
u32 status;
u16 val;
int count;
#if defined(DEBUG)
dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n",
ace->fsm_state, ace->id_req_count);
#endif
/* Verify that there is actually a CF in the slot. If not, then
* bail out back to the idle state and wake up all the waiters */
status = ace_in32(ace, ACE_STATUS);
if ((status & ACE_STATUS_CFDETECT) == 0) {
ace->fsm_state = ACE_FSM_STATE_IDLE;
ace->media_change = 1;
set_capacity(ace->gd, 0);
dev_info(ace->dev, "No CF in slot\n");
/* Drop all in-flight and pending requests */
if (ace->req) {
__blk_end_request_all(ace->req, -EIO);
ace->req = NULL;
}
while ((req = blk_fetch_request(ace->queue)) != NULL)
__blk_end_request_all(req, -EIO);
/* Drop back to IDLE state and notify waiters */
ace->fsm_state = ACE_FSM_STATE_IDLE;
ace->id_result = -EIO;
while (ace->id_req_count) {
complete(&ace->id_completion);
ace->id_req_count--;
}
}
switch (ace->fsm_state) {
case ACE_FSM_STATE_IDLE:
/* See if there is anything to do */
if (ace->id_req_count || ace_get_next_request(ace->queue)) {
ace->fsm_iter_num++;
ace->fsm_state = ACE_FSM_STATE_REQ_LOCK;
mod_timer(&ace->stall_timer, jiffies + HZ);
if (!timer_pending(&ace->stall_timer))
add_timer(&ace->stall_timer);
break;
}
del_timer(&ace->stall_timer);
ace->fsm_continue_flag = 0;
break;
case ACE_FSM_STATE_REQ_LOCK:
if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
/* Already have the lock, jump to next state */
ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
break;
}
/* Request the lock */
val = ace_in(ace, ACE_CTRL);
ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ);
ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK;
break;
case ACE_FSM_STATE_WAIT_LOCK:
if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
/* got the lock; move to next state */
ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
break;
}
/* wait a bit for the lock */
ace_fsm_yield(ace);
break;
case ACE_FSM_STATE_WAIT_CFREADY:
status = ace_in32(ace, ACE_STATUS);
if (!(status & ACE_STATUS_RDYFORCFCMD) ||
(status & ACE_STATUS_CFBSY)) {
/* CF card isn't ready; it needs to be polled */
ace_fsm_yield(ace);
break;
}
/* Device is ready for command; determine what to do next */
if (ace->id_req_count)
ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE;
else
ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE;
break;
case ACE_FSM_STATE_IDENTIFY_PREPARE:
/* Send identify command */
ace->fsm_task = ACE_TASK_IDENTIFY;
ace->data_ptr = ace->cf_id;
ace->data_count = ACE_BUF_PER_SECTOR;
ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY);
/* As per datasheet, put config controller in reset */
val = ace_in(ace, ACE_CTRL);
ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
/* irq handler takes over from this point; wait for the
* transfer to complete */
ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER;
ace_fsm_yieldirq(ace);
break;
case ACE_FSM_STATE_IDENTIFY_TRANSFER:
/* Check that the sysace is ready to receive data */
status = ace_in32(ace, ACE_STATUS);
if (status & ACE_STATUS_CFBSY) {
dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n",
ace->fsm_task, ace->fsm_iter_num,
ace->data_count);
ace_fsm_yield(ace);
break;
}
if (!(status & ACE_STATUS_DATABUFRDY)) {
ace_fsm_yield(ace);
break;
}
/* Transfer the next buffer */
ace->reg_ops->datain(ace);
ace->data_count--;
/* If there are still buffers to be transfers; jump out here */
if (ace->data_count != 0) {
ace_fsm_yieldirq(ace);
break;
}
/* transfer finished; kick state machine */
dev_dbg(ace->dev, "identify finished\n");
ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE;
break;
case ACE_FSM_STATE_IDENTIFY_COMPLETE:
ace_fix_driveid(ace->cf_id);
ace_dump_mem(ace->cf_id, 512); /* Debug: Dump out disk ID */
if (ace->data_result) {
/* Error occured, disable the disk */
ace->media_change = 1;
set_capacity(ace->gd, 0);
dev_err(ace->dev, "error fetching CF id (%i)\n",
ace->data_result);
} else {
ace->media_change = 0;
/* Record disk parameters */
set_capacity(ace->gd,
ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
dev_info(ace->dev, "capacity: %i sectors\n",
ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
}
/* We're done, drop to IDLE state and notify waiters */
ace->fsm_state = ACE_FSM_STATE_IDLE;
ace->id_result = ace->data_result;
while (ace->id_req_count) {
complete(&ace->id_completion);
ace->id_req_count--;
}
break;
case ACE_FSM_STATE_REQ_PREPARE:
req = ace_get_next_request(ace->queue);
if (!req) {
ace->fsm_state = ACE_FSM_STATE_IDLE;
break;
}
blk_start_request(req);
/* Okay, it's a data request, set it up for transfer */
dev_dbg(ace->dev,
"request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
(unsigned long long)blk_rq_pos(req),
blk_rq_sectors(req), blk_rq_cur_sectors(req),
rq_data_dir(req));
ace->req = req;
ace->data_ptr = req->buffer;
ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);
count = blk_rq_sectors(req);
if (rq_data_dir(req)) {
/* Kick off write request */
dev_dbg(ace->dev, "write data\n");
ace->fsm_task = ACE_TASK_WRITE;
ace_out(ace, ACE_SECCNTCMD,
count | ACE_SECCNTCMD_WRITE_DATA);
} else {
/* Kick off read request */
dev_dbg(ace->dev, "read data\n");
ace->fsm_task = ACE_TASK_READ;
ace_out(ace, ACE_SECCNTCMD,
count | ACE_SECCNTCMD_READ_DATA);
}
/* As per datasheet, put config controller in reset */
val = ace_in(ace, ACE_CTRL);
ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
/* Move to the transfer state. The systemace will raise
* an interrupt once there is something to do
*/
ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER;
if (ace->fsm_task == ACE_TASK_READ)
ace_fsm_yieldirq(ace); /* wait for data ready */
break;
case ACE_FSM_STATE_REQ_TRANSFER:
/* Check that the sysace is ready to receive data */
status = ace_in32(ace, ACE_STATUS);
if (status & ACE_STATUS_CFBSY) {
dev_dbg(ace->dev,
"CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
ace->fsm_task, ace->fsm_iter_num,
blk_rq_cur_sectors(ace->req) * 16,
ace->data_count, ace->in_irq);
ace_fsm_yield(ace); /* need to poll CFBSY bit */
break;
}
if (!(status & ACE_STATUS_DATABUFRDY)) {
dev_dbg(ace->dev,
"DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
ace->fsm_task, ace->fsm_iter_num,
blk_rq_cur_sectors(ace->req) * 16,
ace->data_count, ace->in_irq);
ace_fsm_yieldirq(ace);
break;
}
/* Transfer the next buffer */
if (ace->fsm_task == ACE_TASK_WRITE)
ace->reg_ops->dataout(ace);
else
ace->reg_ops->datain(ace);
ace->data_count--;
/* If there are still buffers to be transfers; jump out here */
if (ace->data_count != 0) {
ace_fsm_yieldirq(ace);
break;
}
/* bio finished; is there another one? */
if (__blk_end_request_cur(ace->req, 0)) {
/* dev_dbg(ace->dev, "next block; h=%u c=%u\n",
* blk_rq_sectors(ace->req),
* blk_rq_cur_sectors(ace->req));
*/
ace->data_ptr = ace->req->buffer;
ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
ace_fsm_yieldirq(ace);
break;
}
ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
break;
case ACE_FSM_STATE_REQ_COMPLETE:
ace->req = NULL;
/* Finished request; go to idle state */
ace->fsm_state = ACE_FSM_STATE_IDLE;
break;
default:
ace->fsm_state = ACE_FSM_STATE_IDLE;
break;
}
}
static void ace_fsm_dostate(struct ace_device *ace)
{
struct request *req;
u32 status;
u16 val;
int count;
#if defined(DEBUG)
dev_dbg(ace->dev, "fsm_state=%i, id_req_count=%i\n",
ace->fsm_state, ace->id_req_count);
#endif
/*
*/
status = ace_in32(ace, ACE_STATUS);
if ((status & ACE_STATUS_CFDETECT) == 0) {
ace->fsm_state = ACE_FSM_STATE_IDLE;
ace->media_change = 1;
set_capacity(ace->gd, 0);
dev_info(ace->dev, "No CF in slot\n");
/* */
if (ace->req) {
__blk_end_request_all(ace->req, -EIO);
ace->req = NULL;
}
while ((req = blk_fetch_request(ace->queue)) != NULL)
__blk_end_request_all(req, -EIO);
/* */
ace->fsm_state = ACE_FSM_STATE_IDLE;
ace->id_result = -EIO;
while (ace->id_req_count) {
complete(&ace->id_completion);
ace->id_req_count--;
}
}
switch (ace->fsm_state) {
case ACE_FSM_STATE_IDLE:
/* */
if (ace->id_req_count || ace_get_next_request(ace->queue)) {
ace->fsm_iter_num++;
ace->fsm_state = ACE_FSM_STATE_REQ_LOCK;
mod_timer(&ace->stall_timer, jiffies + HZ);
if (!timer_pending(&ace->stall_timer))
add_timer(&ace->stall_timer);
break;
}
del_timer(&ace->stall_timer);
ace->fsm_continue_flag = 0;
break;
case ACE_FSM_STATE_REQ_LOCK:
if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
/* */
ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
break;
}
/* */
val = ace_in(ace, ACE_CTRL);
ace_out(ace, ACE_CTRL, val | ACE_CTRL_LOCKREQ);
ace->fsm_state = ACE_FSM_STATE_WAIT_LOCK;
break;
case ACE_FSM_STATE_WAIT_LOCK:
if (ace_in(ace, ACE_STATUS) & ACE_STATUS_MPULOCK) {
/* */
ace->fsm_state = ACE_FSM_STATE_WAIT_CFREADY;
break;
}
/* */
ace_fsm_yield(ace);
break;
case ACE_FSM_STATE_WAIT_CFREADY:
status = ace_in32(ace, ACE_STATUS);
if (!(status & ACE_STATUS_RDYFORCFCMD) ||
(status & ACE_STATUS_CFBSY)) {
/* */
ace_fsm_yield(ace);
break;
}
/* */
if (ace->id_req_count)
ace->fsm_state = ACE_FSM_STATE_IDENTIFY_PREPARE;
else
ace->fsm_state = ACE_FSM_STATE_REQ_PREPARE;
break;
case ACE_FSM_STATE_IDENTIFY_PREPARE:
/* */
ace->fsm_task = ACE_TASK_IDENTIFY;
ace->data_ptr = ace->cf_id;
ace->data_count = ACE_BUF_PER_SECTOR;
ace_out(ace, ACE_SECCNTCMD, ACE_SECCNTCMD_IDENTIFY);
/* */
val = ace_in(ace, ACE_CTRL);
ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
/*
*/
ace->fsm_state = ACE_FSM_STATE_IDENTIFY_TRANSFER;
ace_fsm_yieldirq(ace);
break;
case ACE_FSM_STATE_IDENTIFY_TRANSFER:
/* */
status = ace_in32(ace, ACE_STATUS);
if (status & ACE_STATUS_CFBSY) {
dev_dbg(ace->dev, "CFBSY set; t=%i iter=%i dc=%i\n",
ace->fsm_task, ace->fsm_iter_num,
ace->data_count);
ace_fsm_yield(ace);
break;
}
if (!(status & ACE_STATUS_DATABUFRDY)) {
ace_fsm_yield(ace);
break;
}
/* */
ace->reg_ops->datain(ace);
ace->data_count--;
/* */
if (ace->data_count != 0) {
ace_fsm_yieldirq(ace);
break;
}
/* */
dev_dbg(ace->dev, "identify finished\n");
ace->fsm_state = ACE_FSM_STATE_IDENTIFY_COMPLETE;
break;
case ACE_FSM_STATE_IDENTIFY_COMPLETE:
ace_fix_driveid(ace->cf_id);
ace_dump_mem(ace->cf_id, 512); /* */
if (ace->data_result) {
/* */
ace->media_change = 1;
set_capacity(ace->gd, 0);
dev_err(ace->dev, "error fetching CF id (%i)\n",
ace->data_result);
} else {
ace->media_change = 0;
/* */
set_capacity(ace->gd,
ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
dev_info(ace->dev, "capacity: %i sectors\n",
ata_id_u32(ace->cf_id, ATA_ID_LBA_CAPACITY));
}
/* */
ace->fsm_state = ACE_FSM_STATE_IDLE;
ace->id_result = ace->data_result;
while (ace->id_req_count) {
complete(&ace->id_completion);
ace->id_req_count--;
}
break;
case ACE_FSM_STATE_REQ_PREPARE:
req = ace_get_next_request(ace->queue);
if (!req) {
ace->fsm_state = ACE_FSM_STATE_IDLE;
break;
}
blk_start_request(req);
/* */
dev_dbg(ace->dev,
"request: sec=%llx hcnt=%x, ccnt=%x, dir=%i\n",
(unsigned long long)blk_rq_pos(req),
blk_rq_sectors(req), blk_rq_cur_sectors(req),
rq_data_dir(req));
ace->req = req;
ace->data_ptr = req->buffer;
ace->data_count = blk_rq_cur_sectors(req) * ACE_BUF_PER_SECTOR;
ace_out32(ace, ACE_MPULBA, blk_rq_pos(req) & 0x0FFFFFFF);
count = blk_rq_sectors(req);
if (rq_data_dir(req)) {
/* */
dev_dbg(ace->dev, "write data\n");
ace->fsm_task = ACE_TASK_WRITE;
ace_out(ace, ACE_SECCNTCMD,
count | ACE_SECCNTCMD_WRITE_DATA);
} else {
/* */
dev_dbg(ace->dev, "read data\n");
ace->fsm_task = ACE_TASK_READ;
ace_out(ace, ACE_SECCNTCMD,
count | ACE_SECCNTCMD_READ_DATA);
}
/* */
val = ace_in(ace, ACE_CTRL);
ace_out(ace, ACE_CTRL, val | ACE_CTRL_CFGRESET);
/*
*/
ace->fsm_state = ACE_FSM_STATE_REQ_TRANSFER;
if (ace->fsm_task == ACE_TASK_READ)
ace_fsm_yieldirq(ace); /* */
break;
case ACE_FSM_STATE_REQ_TRANSFER:
/* */
status = ace_in32(ace, ACE_STATUS);
if (status & ACE_STATUS_CFBSY) {
dev_dbg(ace->dev,
"CFBSY set; t=%i iter=%i c=%i dc=%i irq=%i\n",
ace->fsm_task, ace->fsm_iter_num,
blk_rq_cur_sectors(ace->req) * 16,
ace->data_count, ace->in_irq);
ace_fsm_yield(ace); /* */
break;
}
if (!(status & ACE_STATUS_DATABUFRDY)) {
dev_dbg(ace->dev,
"DATABUF not set; t=%i iter=%i c=%i dc=%i irq=%i\n",
ace->fsm_task, ace->fsm_iter_num,
blk_rq_cur_sectors(ace->req) * 16,
ace->data_count, ace->in_irq);
ace_fsm_yieldirq(ace);
break;
}
/* */
if (ace->fsm_task == ACE_TASK_WRITE)
ace->reg_ops->dataout(ace);
else
ace->reg_ops->datain(ace);
ace->data_count--;
/* */
if (ace->data_count != 0) {
ace_fsm_yieldirq(ace);
break;
}
/* */
if (__blk_end_request_cur(ace->req, 0)) {
/*
*/
ace->data_ptr = ace->req->buffer;
ace->data_count = blk_rq_cur_sectors(ace->req) * 16;
ace_fsm_yieldirq(ace);
break;
}
ace->fsm_state = ACE_FSM_STATE_REQ_COMPLETE;
break;
case ACE_FSM_STATE_REQ_COMPLETE:
ace->req = NULL;
/* */
ace->fsm_state = ACE_FSM_STATE_IDLE;
break;
default:
ace->fsm_state = ACE_FSM_STATE_IDLE;
break;
}
}