于 2013/9/24 20:55, Ulf Hansson 写道:
On 24 September 2013 11:57, Zhang Haijun <b42...@freescale.com> wrote:
Hi, Ulf
Kindly refer to my inline comment.
于 2013/9/24 16:41, Ulf Hansson 写道:
Hi Haijun,
On 24 September 2013 05:42, Zhang Haijun <b42...@freescale.com> wrote:
Hi, Ulf
I had update the patch according to your suggestion.
I test on my platform during last night.
About 200G random continuous data was written to 32G SDHC Card.
No call trace was encountered.
I think it can meet with your demand and solve the problem.
Sounds promising. :-)
于 2013/9/24 10:08, Haijun Zhang 写道:
When card is in cpu polling mode to detect card present. Card detecting
task will be scheduled about once every second. When card is busy in
large
file transfer, detecting task will be hang and call trace will be
prompt.
When handling the request, CMD13 is always followed by every command
when
it was complete. So assume that card is present to avoid this duplicate
detecting. Only polling card when card is free to reduce conflict with
data transfer.
<7>mmc0: req done (CMD13): 0: 00000e00 00000000 00000000 00000000
INFO: task kworker/u:1:12 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
kworker/u:1 D 00000000 0 12 2 0x00000000
Call Trace:
[ee06dd50] [44042028] 0x44042028
(unreliable)
[ee06de10] [c0007a0c] __switch_to+0xa0/0xf0
[ee06de30] [c04dd50c] __schedule+0x1f8/0x4a4
[ee06dea0] [c04dd898] schedule+0x30/0xbc
[ee06deb0] [c03816a4] __mmc_claim_host+0x98/0x19c
[ee06df00] [c0385f88] mmc_sd_detect+0x38/0xc0
[ee06df10] [c0382b0c] mmc_rescan+0x294/0x2e0
[ee06df40] [c00661cc] process_one_work+0x140/0x3e0
[ee06df70] [c0066bf8] worker_thread+0x18c/0x36c
[ee06dfb0] [c006bf10] kthread+0x7c/0x80
[ee06dff0] [c000de58] kernel_thread+0x4c/0x68
<7>sdhci [sdhci_irq()]: *** mmc0 got interrupt: 0x00000001
Signed-off-by: Haijun Zhang <haijun.zh...@freescale.com>
---
changes for V3:
- Remove mmc_try_claim_host.
changes for V2:
- Add card detecting once the last request is done.
drivers/mmc/card/block.c | 29 +++++++++++++++++++++++++++--
drivers/mmc/core/mmc.c | 5 +++++
drivers/mmc/core/sd.c | 5 +++++
drivers/mmc/core/sdio.c | 5 +++++
4 files changed, 42 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 1a3163f..d1f1730 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -1960,9 +1960,21 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq,
struct request *req)
struct mmc_host *host = card->host;
unsigned long flags;
- if (req && !mq->mqrq_prev->req)
+ if (req && !mq->mqrq_prev->req) {
+ /*
+ * When we are here, card polling task will be blocked.
+ * So disable it to avoid this useless schedule.
+ */
+ if (host->caps & MMC_CAP_NEEDS_POLL) {
+ spin_lock_irqsave(&host->lock, flags);
+ host->rescan_disable = 1;
+ spin_unlock_irqrestore(&host->lock, flags);
+ cancel_delayed_work(&host->detect);
+ }
+
/* claim host only for the first request */
mmc_get_card(card);
+ }
ret = mmc_blk_part_switch(card, md);
if (ret) {
@@ -1999,7 +2011,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq,
struct request *req)
out:
if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
- (req && (req->cmd_flags & MMC_REQ_SPECIAL_MASK)))
+ (req && (req->cmd_flags & MMC_REQ_SPECIAL_MASK)))
{
/*
* Release host when there are no more requests
* and after special request(discard, flush) is done.
@@ -2007,6 +2019,19 @@ out:
* the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
*/
mmc_put_card(card);
+
+ /*
+ * Detecting card status immediately in case card being
+ * removed just after the request is complete.
+ */
+ if (host->caps & MMC_CAP_NEEDS_POLL) {
+ spin_lock_irqsave(&host->lock, flags);
+ host->rescan_disable = 0;
+ spin_unlock_irqrestore(&host->lock, flags);
+ mmc_detect_change(host, 0);
+ }
+ }
+
return ret;
}
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 6d02012..4bdf68c 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1443,6 +1443,7 @@ static int mmc_alive(struct mmc_host *host)
static void mmc_detect(struct mmc_host *host)
{
int err;
+ unsigned long flags;
BUG_ON(!host);
BUG_ON(!host->card);
@@ -1457,6 +1458,10 @@ static void mmc_detect(struct mmc_host *host)
mmc_put_card(host->card);
if (err) {
+ spin_lock_irqsave(&host->lock, flags);
+ host->rescan_disable = 0;
+ spin_unlock_irqrestore(&host->lock, flags);
+
mmc_remove(host);
mmc_claim_host(host);
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 5e8823d..c87203c 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1041,6 +1041,7 @@ static int mmc_sd_alive(struct mmc_host *host)
static void mmc_sd_detect(struct mmc_host *host)
{
int err;
+ unsigned long flags;
BUG_ON(!host);
BUG_ON(!host->card);
@@ -1055,6 +1056,10 @@ static void mmc_sd_detect(struct mmc_host *host)
mmc_put_card(host->card);
if (err) {
+ spin_lock_irqsave(&host->lock, flags);
+ host->rescan_disable = 0;
+ spin_unlock_irqrestore(&host->lock, flags);
+
mmc_sd_remove(host);
mmc_claim_host(host);
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 80d89cff..a59e34b 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -862,6 +862,7 @@ static int mmc_sdio_alive(struct mmc_host *host)
static void mmc_sdio_detect(struct mmc_host *host)
{
int err;
+ unsigned long flags;
BUG_ON(!host);
BUG_ON(!host->card);
@@ -900,6 +901,10 @@ static void mmc_sdio_detect(struct mmc_host *host)
out:
if (err) {
+ spin_lock_irqsave(&host->lock, flags);
+ host->rescan_disable = 0;
+ spin_unlock_irqrestore(&host->lock, flags);
+
mmc_sdio_remove(host);
mmc_claim_host(host);
Re-enabling the rescan, like "host->rescan_disable = 0" shall be done
from mmc_detect_card_removed function instead of from mmc_detect,
mmc_sd_detect mmc_sdio_detect.
Look into the mmc_detect_card_removed and where specific error
handling is done for MMC_CAP_NEEDS_POLL.
Thanks, Ulf
Whether the detect task need to be scheduled was decided in
mmc_detect_card_removed function.
I enable rescan_disable here, just make sure the rescan task can be
scheduled next time before card was
really removed.
The *detect functions are executed from rescan, and only from here.
Thus "rescan_disable" does already has 0 as the present value when
executing this path.
Yes, you are right. This is a redundant code. I just want to make sure
there is no other unexpect reason to break this.
Seemed no need. I'll remove this.
Both interrupt mode and polling mode need the detect task to setup the card
for the fist time.
You have only set rescan_disable to 1 for polling mode. I can't see
how this should affect irq mode?
Redundant check. Not only for polling mode.
So, remove this.
Thanks Ulf.
Kind regards
Ulf Hansson
Or I miss something? :-)
Kind regards
Ulf Hansson
--
Thanks & Regards
Haijun.
--
Thanks & Regards
Haijun.
--
Thanks & Regards
Haijun.
--
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