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memstick: use fully asynchronous request processing 

Instead of using a separate thread to pump requests from block layer queue
to memstick, do so inline, utilizing the callback design of the memstick.

[akpm@linux-foundation.org: fix warnings]
Signed-off-by: Alex Dubov <oakad@yahoo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alex Dubov 2008-07-25 19:45:02 -07:00 committed by Linus Torvalds
parent 17017d8d2c
commit f1d8269802
4 changed files with 214 additions and 213 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/memstick/core/memstick.c
View File

@ -249,8 +249,11 @@ EXPORT_SYMBOL(memstick_next_req);
*/
void memstick_new_req(struct memstick_host *host)
{
host->retries = cmd_retries;
host->request(host);
if (host->card) {
host->retries = cmd_retries;
INIT_COMPLETION(host->card->mrq_complete);
host->request(host);
}
}
EXPORT_SYMBOL(memstick_new_req);

336
drivers/memstick/core/mspro_block.c
View File

@ -136,9 +136,8 @@ struct mspro_block_data {
unsigned int caps;
struct gendisk *disk;
struct request_queue *queue;
struct request *block_req;
spinlock_t q_lock;
wait_queue_head_t q_wait;
struct task_struct *q_thread;
unsigned short page_size;
unsigned short cylinders;
@ -147,9 +146,10 @@ struct mspro_block_data {
unsigned char system;
unsigned char read_only:1,
active:1,
eject:1,
has_request:1,
data_dir:1;
data_dir:1,
active:1;
unsigned char transfer_cmd;
int (*mrq_handler)(struct memstick_dev *card,
@ -160,12 +160,14 @@ struct mspro_block_data {
struct scatterlist req_sg[MSPRO_BLOCK_MAX_SEGS];
unsigned int seg_count;
unsigned int current_seg;
unsigned short current_page;
unsigned int current_page;
};
static DEFINE_IDR(mspro_block_disk_idr);
static DEFINE_MUTEX(mspro_block_disk_lock);
static int mspro_block_complete_req(struct memstick_dev *card, int error);
/*** Block device ***/
static int mspro_block_bd_open(struct inode *inode, struct file *filp)
@ -197,8 +199,10 @@ static int mspro_block_disk_release(struct gendisk *disk)
mutex_lock(&mspro_block_disk_lock);
if (msb->usage_count) {
msb->usage_count--;
if (msb) {
if (msb->usage_count)
msb->usage_count--;
if (!msb->usage_count) {
kfree(msb);
disk->private_data = NULL;
@ -523,11 +527,13 @@ static int h_mspro_block_req_init(struct memstick_dev *card,
static int h_mspro_block_default(struct memstick_dev *card,
struct memstick_request **mrq)
{
complete(&card->mrq_complete);
if (!(*mrq)->error)
return -EAGAIN;
else
return (*mrq)->error;
return mspro_block_complete_req(card, (*mrq)->error);
}
static int h_mspro_block_default_bad(struct memstick_dev *card,
struct memstick_request **mrq)
{
return -ENXIO;
}
static int h_mspro_block_get_ro(struct memstick_dev *card,
@ -535,44 +541,30 @@ static int h_mspro_block_get_ro(struct memstick_dev *card,
{
struct mspro_block_data *msb = memstick_get_drvdata(card);
if ((*mrq)->error) {
complete(&card->mrq_complete);
return (*mrq)->error;
if (!(*mrq)->error) {
if ((*mrq)->data[offsetof(struct ms_status_register, status0)]
& MEMSTICK_STATUS0_WP)
msb->read_only = 1;
else
msb->read_only = 0;
}
if ((*mrq)->data[offsetof(struct ms_status_register, status0)]
& MEMSTICK_STATUS0_WP)
msb->read_only = 1;
else
msb->read_only = 0;
complete(&card->mrq_complete);
return -EAGAIN;
return mspro_block_complete_req(card, (*mrq)->error);
}
static int h_mspro_block_wait_for_ced(struct memstick_dev *card,
struct memstick_request **mrq)
{
if ((*mrq)->error) {
complete(&card->mrq_complete);
return (*mrq)->error;
}
dev_dbg(&card->dev, "wait for ced: value %x\n", (*mrq)->data[0]);
if ((*mrq)->data[0] & (MEMSTICK_INT_CMDNAK | MEMSTICK_INT_ERR)) {
card->current_mrq.error = -EFAULT;
complete(&card->mrq_complete);
return card->current_mrq.error;
if (!(*mrq)->error) {
if ((*mrq)->data[0] & (MEMSTICK_INT_CMDNAK | MEMSTICK_INT_ERR))
(*mrq)->error = -EFAULT;
else if (!((*mrq)->data[0] & MEMSTICK_INT_CED))
return 0;
}
if (!((*mrq)->data[0] & MEMSTICK_INT_CED))
return 0;
else {
card->current_mrq.error = 0;
complete(&card->mrq_complete);
return -EAGAIN;
}
return mspro_block_complete_req(card, (*mrq)->error);
}
static int h_mspro_block_transfer_data(struct memstick_dev *card,
@ -583,10 +575,8 @@ static int h_mspro_block_transfer_data(struct memstick_dev *card,
struct scatterlist t_sg = { 0 };
size_t t_offset;
if ((*mrq)->error) {
complete(&card->mrq_complete);
return (*mrq)->error;
}
if ((*mrq)->error)
return mspro_block_complete_req(card, (*mrq)->error);
switch ((*mrq)->tpc) {
case MS_TPC_WRITE_REG:
@ -617,8 +607,8 @@ has_int_reg:
if (msb->current_seg == msb->seg_count) {
if (t_val & MEMSTICK_INT_CED) {
complete(&card->mrq_complete);
return -EAGAIN;
return mspro_block_complete_req(card,
0);
} else {
card->next_request
= h_mspro_block_wait_for_ced;
@ -666,90 +656,120 @@ has_int_reg:
/*** Data transfer ***/
static void mspro_block_process_request(struct memstick_dev *card,
struct request *req)
static int mspro_block_issue_req(struct memstick_dev *card, int chunk)
{
struct mspro_block_data *msb = memstick_get_drvdata(card);
struct mspro_param_register param;
int rc, chunk, cnt;
unsigned short page_count;
sector_t t_sec;
unsigned long flags;
unsigned int count;
struct mspro_param_register param;
do {
page_count = 0;
try_again:
while (chunk) {
msb->current_page = 0;
msb->current_seg = 0;
msb->seg_count = blk_rq_map_sg(req->q, req, msb->req_sg);
msb->seg_count = blk_rq_map_sg(msb->block_req->q,
msb->block_req,
msb->req_sg);
if (msb->seg_count) {
msb->current_page = 0;
for (rc = 0; rc < msb->seg_count; rc++)
page_count += msb->req_sg[rc].length
/ msb->page_size;
if (!msb->seg_count) {
chunk = __blk_end_request(msb->block_req, -ENOMEM,
blk_rq_cur_bytes(msb->block_req));
continue;
}
t_sec = req->sector;
sector_div(t_sec, msb->page_size >> 9);
param.system = msb->system;
param.data_count = cpu_to_be16(page_count);
param.data_address = cpu_to_be32((uint32_t)t_sec);
param.tpc_param = 0;
t_sec = msb->block_req->sector << 9;
sector_div(t_sec, msb->page_size);
msb->data_dir = rq_data_dir(req);
msb->transfer_cmd = msb->data_dir == READ
? MSPRO_CMD_READ_DATA
: MSPRO_CMD_WRITE_DATA;
count = msb->block_req->nr_sectors << 9;
count /= msb->page_size;
dev_dbg(&card->dev, "data transfer: cmd %x, "
"lba %x, count %x\n", msb->transfer_cmd,
be32_to_cpu(param.data_address),
page_count);
param.system = msb->system;
param.data_count = cpu_to_be16(count);
param.data_address = cpu_to_be32((uint32_t)t_sec);
param.tpc_param = 0;
card->next_request = h_mspro_block_req_init;
msb->mrq_handler = h_mspro_block_transfer_data;
memstick_init_req(&card->current_mrq, MS_TPC_WRITE_REG,
&param, sizeof(param));
memstick_new_req(card->host);
wait_for_completion(&card->mrq_complete);
rc = card->current_mrq.error;
msb->data_dir = rq_data_dir(msb->block_req);
msb->transfer_cmd = msb->data_dir == READ
? MSPRO_CMD_READ_DATA
: MSPRO_CMD_WRITE_DATA;
if (rc || (card->current_mrq.tpc == MSPRO_CMD_STOP)) {
for (cnt = 0; cnt < msb->current_seg; cnt++)
page_count += msb->req_sg[cnt].length
/ msb->page_size;
dev_dbg(&card->dev, "data transfer: cmd %x, "
"lba %x, count %x\n", msb->transfer_cmd,
be32_to_cpu(param.data_address), count);
if (msb->current_page)
page_count += msb->current_page - 1;
card->next_request = h_mspro_block_req_init;
msb->mrq_handler = h_mspro_block_transfer_data;
memstick_init_req(&card->current_mrq, MS_TPC_WRITE_REG,
&param, sizeof(param));
memstick_new_req(card->host);
return 0;
}
if (page_count && (msb->data_dir == READ))
rc = msb->page_size * page_count;
else
rc = -EIO;
} else
rc = msb->page_size * page_count;
} else
rc = -EFAULT;
dev_dbg(&card->dev, "elv_next\n");
msb->block_req = elv_next_request(msb->queue);
if (!msb->block_req) {
dev_dbg(&card->dev, "issue end\n");
return -EAGAIN;
}
spin_lock_irqsave(&msb->q_lock, flags);
if (rc >= 0)
chunk = __blk_end_request(req, 0, rc);
else
chunk = __blk_end_request(req, rc, 0);
dev_dbg(&card->dev, "end chunk %d, %d\n", rc, chunk);
spin_unlock_irqrestore(&msb->q_lock, flags);
} while (chunk);
dev_dbg(&card->dev, "trying again\n");
chunk = 1;
goto try_again;
}
static int mspro_block_has_request(struct mspro_block_data *msb)
static int mspro_block_complete_req(struct memstick_dev *card, int error)
{
int rc = 0;
struct mspro_block_data *msb = memstick_get_drvdata(card);
int chunk, cnt;
unsigned int t_len = 0;
unsigned long flags;
spin_lock_irqsave(&msb->q_lock, flags);
if (kthread_should_stop() || msb->has_request)
rc = 1;
dev_dbg(&card->dev, "complete %d, %d\n", msb->has_request ? 1 : 0,
error);
if (msb->has_request) {
/* Nothing to do - not really an error */
if (error == -EAGAIN)
error = 0;
if (error || (card->current_mrq.tpc == MSPRO_CMD_STOP)) {
if (msb->data_dir == READ) {
for (cnt = 0; cnt < msb->current_seg; cnt++)
t_len += msb->req_sg[cnt].length
/ msb->page_size;
if (msb->current_page)
t_len += msb->current_page - 1;
t_len *= msb->page_size;
}
} else
t_len = msb->block_req->nr_sectors << 9;
dev_dbg(&card->dev, "transferred %x (%d)\n", t_len, error);
if (error && !t_len)
t_len = blk_rq_cur_bytes(msb->block_req);
chunk = __blk_end_request(msb->block_req, error, t_len);
error = mspro_block_issue_req(card, chunk);
if (!error)
goto out;
else
msb->has_request = 0;
} else {
if (!error)
error = -EAGAIN;
}
card->next_request = h_mspro_block_default_bad;
complete_all(&card->mrq_complete);
out:
spin_unlock_irqrestore(&msb->q_lock, flags);
return rc;
return error;
}
static void mspro_block_stop(struct memstick_dev *card)
@ -783,54 +803,37 @@ static void mspro_block_start(struct memstick_dev *card)
spin_unlock_irqrestore(&msb->q_lock, flags);
}
static int mspro_block_queue_thread(void *data)
static int mspro_block_prepare_req(struct request_queue *q, struct request *req)
{
struct memstick_dev *card = data;
struct memstick_host *host = card->host;
struct mspro_block_data *msb = memstick_get_drvdata(card);
struct request *req;
unsigned long flags;
while (1) {
wait_event(msb->q_wait, mspro_block_has_request(msb));
dev_dbg(&card->dev, "thread iter\n");
spin_lock_irqsave(&msb->q_lock, flags);
req = elv_next_request(msb->queue);
dev_dbg(&card->dev, "next req %p\n", req);
if (!req) {
msb->has_request = 0;
if (kthread_should_stop()) {
spin_unlock_irqrestore(&msb->q_lock, flags);
break;
}
} else
msb->has_request = 1;
spin_unlock_irqrestore(&msb->q_lock, flags);
if (req) {
mutex_lock(&host->lock);
mspro_block_process_request(card, req);
mutex_unlock(&host->lock);
}
if (!blk_fs_request(req) && !blk_pc_request(req)) {
blk_dump_rq_flags(req, "MSPro unsupported request");
return BLKPREP_KILL;
}
dev_dbg(&card->dev, "thread finished\n");
return 0;
req->cmd_flags |= REQ_DONTPREP;
return BLKPREP_OK;
}
static void mspro_block_request(struct request_queue *q)
static void mspro_block_submit_req(struct request_queue *q)
{
struct memstick_dev *card = q->queuedata;
struct mspro_block_data *msb = memstick_get_drvdata(card);
struct request *req = NULL;
if (msb->q_thread) {
msb->has_request = 1;
wake_up_all(&msb->q_wait);
} else {
if (msb->has_request)
return;
if (msb->eject) {
while ((req = elv_next_request(q)) != NULL)
end_queued_request(req, -ENODEV);
return;
}
msb->has_request = 1;
if (mspro_block_issue_req(card, 0))
msb->has_request = 0;
}
/*** Initialization ***/
@ -1200,16 +1203,14 @@ static int mspro_block_init_disk(struct memstick_dev *card)
goto out_release_id;
}
spin_lock_init(&msb->q_lock);
init_waitqueue_head(&msb->q_wait);
msb->queue = blk_init_queue(mspro_block_request, &msb->q_lock);
msb->queue = blk_init_queue(mspro_block_submit_req, &msb->q_lock);
if (!msb->queue) {
rc = -ENOMEM;
goto out_put_disk;
}
msb->queue->queuedata = card;
blk_queue_prep_rq(msb->queue, mspro_block_prepare_req);
blk_queue_bounce_limit(msb->queue, limit);
blk_queue_max_sectors(msb->queue, MSPRO_BLOCK_MAX_PAGES);
@ -1235,14 +1236,8 @@ static int mspro_block_init_disk(struct memstick_dev *card)
capacity *= msb->page_size >> 9;
set_capacity(msb->disk, capacity);
dev_dbg(&card->dev, "capacity set %ld\n", capacity);
msb->q_thread = kthread_run(mspro_block_queue_thread, card,
DRIVER_NAME"d");
if (IS_ERR(msb->q_thread))
goto out_put_disk;
mutex_unlock(&host->lock);
add_disk(msb->disk);
mutex_lock(&host->lock);
msb->active = 1;
return 0;
@ -1290,6 +1285,7 @@ static int mspro_block_probe(struct memstick_dev *card)
return -ENOMEM;
memstick_set_drvdata(card, msb);
msb->card = card;
spin_lock_init(&msb->q_lock);
rc = mspro_block_init_card(card);
@ -1319,26 +1315,17 @@ out_free:
static void mspro_block_remove(struct memstick_dev *card)
{
struct mspro_block_data *msb = memstick_get_drvdata(card);
struct task_struct *q_thread = NULL;
unsigned long flags;
del_gendisk(msb->disk);
dev_dbg(&card->dev, "mspro block remove\n");
spin_lock_irqsave(&msb->q_lock, flags);
q_thread = msb->q_thread;
msb->q_thread = NULL;
msb->active = 0;
msb->eject = 1;
blk_start_queue(msb->queue);
spin_unlock_irqrestore(&msb->q_lock, flags);
if (q_thread) {
mutex_unlock(&card->host->lock);
kthread_stop(q_thread);
mutex_lock(&card->host->lock);
}
dev_dbg(&card->dev, "queue thread stopped\n");
blk_cleanup_queue(msb->queue);
msb->queue = NULL;
sysfs_remove_group(&card->dev.kobj, &msb->attr_group);
@ -1355,19 +1342,13 @@ static void mspro_block_remove(struct memstick_dev *card)
static int mspro_block_suspend(struct memstick_dev *card, pm_message_t state)
{
struct mspro_block_data *msb = memstick_get_drvdata(card);
struct task_struct *q_thread = NULL;
unsigned long flags;
spin_lock_irqsave(&msb->q_lock, flags);
q_thread = msb->q_thread;
msb->q_thread = NULL;
msb->active = 0;
blk_stop_queue(msb->queue);
msb->active = 0;
spin_unlock_irqrestore(&msb->q_lock, flags);
if (q_thread)
kthread_stop(q_thread);
return 0;
}
@ -1406,14 +1387,7 @@ static int mspro_block_resume(struct memstick_dev *card)
if (memcmp(s_attr->data, r_attr->data, s_attr->size))
break;
memstick_set_drvdata(card, msb);
msb->q_thread = kthread_run(mspro_block_queue_thread,
card, DRIVER_NAME"d");
if (IS_ERR(msb->q_thread))
msb->q_thread = NULL;
else
msb->active = 1;
msb->active = 1;
break;
}
}

35
drivers/memstick/host/jmb38x_ms.c
View File

@ -50,6 +50,7 @@ struct jmb38x_ms_host {
struct jmb38x_ms *chip;
void __iomem *addr;
spinlock_t lock;
struct tasklet_struct notify;
int id;
char host_id[32];
int irq;
@ -590,25 +591,35 @@ static void jmb38x_ms_abort(unsigned long data)
spin_unlock_irqrestore(&host->lock, flags);
}
static void jmb38x_ms_request(struct memstick_host *msh)
static void jmb38x_ms_req_tasklet(unsigned long data)
{
struct memstick_host *msh = (struct memstick_host *)data;
struct jmb38x_ms_host *host = memstick_priv(msh);
unsigned long flags;
int rc;
spin_lock_irqsave(&host->lock, flags);
if (host->req) {
spin_unlock_irqrestore(&host->lock, flags);
BUG();
return;
if (!host->req) {
do {
rc = memstick_next_req(msh, &host->req);
dev_dbg(&host->chip->pdev->dev, "tasklet req %d\n", rc);
} while (!rc && jmb38x_ms_issue_cmd(msh));
}
do {
rc = memstick_next_req(msh, &host->req);
} while (!rc && jmb38x_ms_issue_cmd(msh));
spin_unlock_irqrestore(&host->lock, flags);
}
static void jmb38x_ms_dummy_submit(struct memstick_host *msh)
{
return;
}
static void jmb38x_ms_submit_req(struct memstick_host *msh)
{
struct jmb38x_ms_host *host = memstick_priv(msh);
tasklet_schedule(&host->notify);
}
static int jmb38x_ms_reset(struct jmb38x_ms_host *host)
{
int cnt;
@ -816,7 +827,9 @@ static struct memstick_host *jmb38x_ms_alloc_host(struct jmb38x_ms *jm, int cnt)
host->id);
host->irq = jm->pdev->irq;
host->timeout_jiffies = msecs_to_jiffies(1000);
msh->request = jmb38x_ms_request;
tasklet_init(&host->notify, jmb38x_ms_req_tasklet, (unsigned long)msh);
msh->request = jmb38x_ms_submit_req;
msh->set_param = jmb38x_ms_set_param;
msh->caps = MEMSTICK_CAP_PAR4 | MEMSTICK_CAP_PAR8;
@ -928,6 +941,8 @@ static void jmb38x_ms_remove(struct pci_dev *dev)
host = memstick_priv(jm->hosts[cnt]);
jm->hosts[cnt]->request = jmb38x_ms_dummy_submit;
tasklet_kill(&host->notify);
writel(0, host->addr + INT_SIGNAL_ENABLE);
writel(0, host->addr + INT_STATUS_ENABLE);
mmiowb();

49
drivers/memstick/host/tifm_ms.c
View File

@ -71,6 +71,7 @@ struct tifm_ms {
struct tifm_dev *dev;
struct timer_list timer;
struct memstick_request *req;
struct tasklet_struct notify;
unsigned int mode_mask;
unsigned int block_pos;
unsigned long timeout_jiffies;
@ -455,40 +456,45 @@ static void tifm_ms_card_event(struct tifm_dev *sock)
return;
}
static void tifm_ms_request(struct memstick_host *msh)
static void tifm_ms_req_tasklet(unsigned long data)
{
struct memstick_host *msh = (struct memstick_host *)data;
struct tifm_ms *host = memstick_priv(msh);
struct tifm_dev *sock = host->dev;
unsigned long flags;
int rc;
spin_lock_irqsave(&sock->lock, flags);
if (host->req) {
printk(KERN_ERR "%s : unfinished request detected\n",
sock->dev.bus_id);
spin_unlock_irqrestore(&sock->lock, flags);
tifm_eject(host->dev);
return;
}
if (!host->req) {
if (host->eject) {
do {
rc = memstick_next_req(msh, &host->req);
if (!rc)
host->req->error = -ETIME;
} while (!rc);
spin_unlock_irqrestore(&sock->lock, flags);
return;
}
if (host->eject) {
do {
rc = memstick_next_req(msh, &host->req);
if (!rc)
host->req->error = -ETIME;
} while (!rc);
spin_unlock_irqrestore(&sock->lock, flags);
return;
} while (!rc && tifm_ms_issue_cmd(host));
}
do {
rc = memstick_next_req(msh, &host->req);
} while (!rc && tifm_ms_issue_cmd(host));
spin_unlock_irqrestore(&sock->lock, flags);
}
static void tifm_ms_dummy_submit(struct memstick_host *msh)
{
return;
}
static void tifm_ms_submit_req(struct memstick_host *msh)
{
struct tifm_ms *host = memstick_priv(msh);
tasklet_schedule(&host->notify);
}
static int tifm_ms_set_param(struct memstick_host *msh,
enum memstick_param param,
int value)
@ -569,8 +575,9 @@ static int tifm_ms_probe(struct tifm_dev *sock)
host->timeout_jiffies = msecs_to_jiffies(1000);
setup_timer(&host->timer, tifm_ms_abort, (unsigned long)host);
tasklet_init(&host->notify, tifm_ms_req_tasklet, (unsigned long)msh);
msh->request = tifm_ms_request;
msh->request = tifm_ms_submit_req;
msh->set_param = tifm_ms_set_param;
sock->card_event = tifm_ms_card_event;
sock->data_event = tifm_ms_data_event;
@ -592,6 +599,8 @@ static void tifm_ms_remove(struct tifm_dev *sock)
int rc = 0;
unsigned long flags;
msh->request = tifm_ms_dummy_submit;
tasklet_kill(&host->notify);
spin_lock_irqsave(&sock->lock, flags);
host->eject = 1;
if (host->req) {