>From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001
From: Chuanxiao Dong <[email protected]>
Date: Mon, 22 Nov 2010 16:31:12 +0800
Subject: [PATCH 1/4] mmc: Enabled background operations feature if eMMC card supports
Background operations is a new feature defined in eMMC4.41 standard.
Since this feature is opertional for eMMC card, so driver only enable
for those eMMC card which supports this feature
Signed-off-by: Chuanxiao Dong <[email protected]>
---
drivers/mmc/core/mmc.c | 26 ++++++++++++++++++++++++++
include/linux/mmc/card.h | 2 ++
include/linux/mmc/mmc.h | 3 +++
3 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 77f93c3..471ed82 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -310,6 +310,14 @@ static int mmc_read_ext_csd(struct mmc_card *card)
ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
card->ext_csd.trim_timeout = 300 *
ext_csd[EXT_CSD_TRIM_MULT];
+
+ /* detect whether the eMMC card support BKOPS */
+ if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
+ card->ext_csd.bkops = 1;
+ card->ext_csd.bkops_en =
+ ext_csd[EXT_CSD_BKOPS_EN];
+ }
+
}
if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
@@ -484,6 +492,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
}
/*
+ * enable BKOPS if eMMC card supports.
+ */
+ if (card->ext_csd.bkops) {
+ if (!card->ext_csd.bkops_en) {
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_BKOPS_EN, 1);
+ if (err && err != -EBADMSG)
+ goto free_card;
+
+ if (err) {
+ card->ext_csd.bkops_en = 0;
+ err = 0;
+ } else
+ card->ext_csd.bkops_en = 1;
+ }
+ }
+
+ /*
* Activate high speed (if supported)
*/
if ((card->ext_csd.hs_max_dtr != 0) &&
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 8ce0827..9b755cb 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -54,6 +54,8 @@ struct mmc_ext_csd {
unsigned int sec_trim_mult; /* Secure trim multiplier */
unsigned int sec_erase_mult; /* Secure erase multiplier */
unsigned int trim_timeout; /* In milliseconds */
+ unsigned int bkops:1; /* background support bit */
+ unsigned int bkops_en:1; /* background enable bit */
};
struct sd_scr {
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 956fbd8..14f7813 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -251,6 +251,8 @@ struct _mmc_csd {
* EXT_CSD fields
*/
+#define EXT_CSD_BKOPS_EN 163 /* R/W */
+#define EXT_CSD_BKOPS_START 164 /* W */
#define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */
#define EXT_CSD_ERASED_MEM_CONT 181 /* RO */
#define EXT_CSD_BUS_WIDTH 183 /* R/W */
@@ -266,6 +268,7 @@ struct _mmc_csd {
#define EXT_CSD_SEC_ERASE_MULT 230 /* RO */
#define EXT_CSD_SEC_FEATURE_SUPPORT 231 /* RO */
#define EXT_CSD_TRIM_MULT 232 /* RO */
+#define EXT_CSD_BKOPS_SUPPORT 502 /* RO */
/*
* EXT_CSD field definitions
--
1.6.6.1
<Tested-by: Kyungmin Park <[email protected]>
Note that I'm not yet see any performance improvements :)
On Fri, Dec 3, 2010 at 9:13 PM, Chuanxiao Dong <[email protected]> wrote:
> From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001
> From: Chuanxiao Dong <[email protected]>
> Date: Mon, 22 Nov 2010 16:31:12 +0800
> Subject: [PATCH 1/4] mmc: Enabled background operations feature if eMMC card supports
>
> Background operations is a new feature defined in eMMC4.41 standard.
> Since this feature is opertional for eMMC card, so driver only enable
> for those eMMC card which supports this feature
>
> Signed-off-by: Chuanxiao Dong <[email protected]>
> ---
> ?drivers/mmc/core/mmc.c ? | ? 26 ++++++++++++++++++++++++++
> ?include/linux/mmc/card.h | ? ?2 ++
> ?include/linux/mmc/mmc.h ?| ? ?3 +++
> ?3 files changed, 31 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 77f93c3..471ed82 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -310,6 +310,14 @@ static int mmc_read_ext_csd(struct mmc_card *card)
> ? ? ? ? ? ? ? ? ? ? ? ?ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
> ? ? ? ? ? ? ? ?card->ext_csd.trim_timeout = 300 *
> ? ? ? ? ? ? ? ? ? ? ? ?ext_csd[EXT_CSD_TRIM_MULT];
> +
> + ? ? ? ? ? ? ? /* detect whether the eMMC card support BKOPS */
> + ? ? ? ? ? ? ? if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
> + ? ? ? ? ? ? ? ? ? ? ? card->ext_csd.bkops = 1;
> + ? ? ? ? ? ? ? ? ? ? ? card->ext_csd.bkops_en =
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ext_csd[EXT_CSD_BKOPS_EN];
> + ? ? ? ? ? ? ? }
> +
> ? ? ? ?}
>
> ? ? ? ?if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
> @@ -484,6 +492,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> ? ? ? ?}
>
> ? ? ? ?/*
> + ? ? ? ?* enable BKOPS if eMMC card supports.
> + ? ? ? ?*/
> + ? ? ? if (card->ext_csd.bkops) {
> + ? ? ? ? ? ? ? if (!card->ext_csd.bkops_en) {
> + ? ? ? ? ? ? ? ? ? ? ? err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? EXT_CSD_BKOPS_EN, 1);
> + ? ? ? ? ? ? ? ? ? ? ? if (err && err != -EBADMSG)
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? goto free_card;
> +
> + ? ? ? ? ? ? ? ? ? ? ? if (err) {
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? card->ext_csd.bkops_en = 0;
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? err = 0;
> + ? ? ? ? ? ? ? ? ? ? ? } else
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? card->ext_csd.bkops_en = 1;
> + ? ? ? ? ? ? ? }
> + ? ? ? }
> +
> + ? ? ? /*
> ? ? ? ? * Activate high speed (if supported)
> ? ? ? ? */
> ? ? ? ?if ((card->ext_csd.hs_max_dtr != 0) &&
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 8ce0827..9b755cb 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -54,6 +54,8 @@ struct mmc_ext_csd {
> ? ? ? ?unsigned int ? ? ? ? ? ?sec_trim_mult; ?/* Secure trim multiplier ?*/
> ? ? ? ?unsigned int ? ? ? ? ? ?sec_erase_mult; /* Secure erase multiplier */
> ? ? ? ?unsigned int ? ? ? ? ? ?trim_timeout; ? ? ? ? ? /* In milliseconds */
> + ? ? ? unsigned int ? ? ? ? ? ?bkops:1; /* background support bit */
> + ? ? ? unsigned int ? ? ? ? ? ?bkops_en:1; /* background enable bit */
> ?};
>
> ?struct sd_scr {
> diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
> index 956fbd8..14f7813 100644
> --- a/include/linux/mmc/mmc.h
> +++ b/include/linux/mmc/mmc.h
> @@ -251,6 +251,8 @@ struct _mmc_csd {
> ?* EXT_CSD fields
> ?*/
>
> +#define EXT_CSD_BKOPS_EN ? ? ? ? ? ? ? 163 ? ? /* R/W */
> +#define EXT_CSD_BKOPS_START ? ? ? ? ? ?164 ? ? /* W */
> ?#define EXT_CSD_ERASE_GROUP_DEF ? ? ? ? ? ? ? ?175 ? ? /* R/W */
> ?#define EXT_CSD_ERASED_MEM_CONT ? ? ? ? ? ? ? ?181 ? ? /* RO */
> ?#define EXT_CSD_BUS_WIDTH ? ? ? ? ? ? ?183 ? ? /* R/W */
> @@ -266,6 +268,7 @@ struct _mmc_csd {
> ?#define EXT_CSD_SEC_ERASE_MULT ? ? ? ? 230 ? ? /* RO */
> ?#define EXT_CSD_SEC_FEATURE_SUPPORT ? ?231 ? ? /* RO */
> ?#define EXT_CSD_TRIM_MULT ? ? ? ? ? ? ?232 ? ? /* RO */
> +#define EXT_CSD_BKOPS_SUPPORT ?502 ? ? /* RO */
>
> ?/*
> ?* EXT_CSD field definitions
> --
> 1.6.6.1
>
>
> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf Of
> Kyungmin Park
> Sent: Monday, December 06, 2010 9:12 AM
> To: Dong, Chuanxiao
> Cc: [email protected]; [email protected]; [email protected];
> [email protected]; [email protected]; [email protected]
> Subject: Re: [PATCH v2 1/4]enable background operations for supported eMMC
> card
>
> <Tested-by: Kyungmin Park <[email protected]>
>
> Note that I'm not yet see any performance improvements :)
Thanks Park. Can you tell me the testing steps you used?
During the test, has there any background operation been started?
I think two cases can be tested to check whether there is performance improvement or not.
One is doing background operations when card is busy for reading/writing. The other is doing background operations when card is idle.
Thanks
Chuanxiao
On Friday 03 December 2010, Chuanxiao Dong wrote:
> From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001
> From: Chuanxiao Dong <[email protected]>
> Date: Mon, 22 Nov 2010 16:31:12 +0800
> Subject: [PATCH 1/4] mmc: Enabled background operations feature if eMMC card supports
These headers don't belong into a submission. If you use git-send-email,
they get cut off automatically, otherwise just remove them as you paste
the patch into your mail client.
> Background operations is a new feature defined in eMMC4.41 standard.
> Since this feature is opertional for eMMC card, so driver only enable
s/opertional/optional/
> @@ -54,6 +54,8 @@ struct mmc_ext_csd {
> unsigned int sec_trim_mult; /* Secure trim multiplier */
> unsigned int sec_erase_mult; /* Secure erase multiplier */
> unsigned int trim_timeout; /* In milliseconds */
> + unsigned int bkops:1; /* background support bit */
> + unsigned int bkops_en:1; /* background enable bit */
> };
Bit fields are not encouraged for kernel internal data structures,
just use "bool" variables here.
Arnd
> -----Original Message-----
> From: Arnd Bergmann [mailto:[email protected]]
> Sent: Monday, December 06, 2010 8:29 PM
> To: Dong, Chuanxiao
> Cc: [email protected]; [email protected]; [email protected];
> [email protected]; [email protected]; [email protected];
> [email protected]
> Subject: Re: [PATCH v2 1/4]enable background operations for supported eMMC
> card
>
> On Friday 03 December 2010, Chuanxiao Dong wrote:
> > From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001
> > From: Chuanxiao Dong <[email protected]>
> > Date: Mon, 22 Nov 2010 16:31:12 +0800
> > Subject: [PATCH 1/4] mmc: Enabled background operations feature if eMMC card
> supports
>
> These headers don't belong into a submission. If you use git-send-email,
> they get cut off automatically, otherwise just remove them as you paste
> the patch into your mail client.
>
OK. I will remove them when the next submission.
> > Background operations is a new feature defined in eMMC4.41 standard.
> > Since this feature is opertional for eMMC card, so driver only enable
>
> s/opertional/optional/
> > @@ -54,6 +54,8 @@ struct mmc_ext_csd {
> > unsigned int sec_trim_mult; /* Secure trim multiplier */
> > unsigned int sec_erase_mult; /* Secure erase multiplier */
> > unsigned int trim_timeout; /* In milliseconds */
> > + unsigned int bkops:1; /* background support bit */
> > + unsigned int bkops_en:1; /* background enable bit */
> > };
>
> Bit fields are not encouraged for kernel internal data structures,
> just use "bool" variables here.
Thanks Arnd. I will fix this.
> > These headers don't belong into a submission. If you use git-send-email,
> > they get cut off automatically, otherwise just remove them as you paste
> > the patch into your mail client.
> >
> OK. I will remove them when the next submission.
'git send-email' takes care of a lot of other things, too (e.g. chaining
all following messages to the first one) - strong recommendation :)
Regards,
Wolfram
--
Pengutronix e.K. | Wolfram Sang |
Industrial Linux Solutions | http://www.pengutronix.de/ |
On Fri, Dec 3, 2010 at 1:13 PM, Chuanxiao Dong <[email protected]> wrote:
> From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001
> From: Chuanxiao Dong <[email protected]>
> Date: Mon, 22 Nov 2010 16:31:12 +0800
> Subject: [PATCH 1/4] mmc: Enabled background operations feature if eMMC card supports
>
> Background operations is a new feature defined in eMMC4.41 standard.
> Since this feature is opertional for eMMC card, so driver only enable
> for those eMMC card which supports this feature
>
> Signed-off-by: Chuanxiao Dong <[email protected]>
> ---
> ?drivers/mmc/core/mmc.c ? | ? 26 ++++++++++++++++++++++++++
> ?include/linux/mmc/card.h | ? ?2 ++
> ?include/linux/mmc/mmc.h ?| ? ?3 +++
> ?3 files changed, 31 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 77f93c3..471ed82 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -310,6 +310,14 @@ static int mmc_read_ext_csd(struct mmc_card *card)
> ? ? ? ? ? ? ? ? ? ? ? ?ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
> ? ? ? ? ? ? ? ?card->ext_csd.trim_timeout = 300 *
> ? ? ? ? ? ? ? ? ? ? ? ?ext_csd[EXT_CSD_TRIM_MULT];
> +
> + ? ? ? ? ? ? ? /* detect whether the eMMC card support BKOPS */
> + ? ? ? ? ? ? ? if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
> + ? ? ? ? ? ? ? ? ? ? ? card->ext_csd.bkops = 1;
> + ? ? ? ? ? ? ? ? ? ? ? card->ext_csd.bkops_en =
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ext_csd[EXT_CSD_BKOPS_EN];
> + ? ? ? ? ? ? ? }
> +
> ? ? ? ?}
>
> ? ? ? ?if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
> @@ -484,6 +492,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
> ? ? ? ?}
>
> ? ? ? ?/*
> + ? ? ? ?* enable BKOPS if eMMC card supports.
> + ? ? ? ?*/
> + ? ? ? if (card->ext_csd.bkops) {
> + ? ? ? ? ? ? ? if (!card->ext_csd.bkops_en) {
> + ? ? ? ? ? ? ? ? ? ? ? err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? EXT_CSD_BKOPS_EN, 1);
Is it always wise to set BKOPS_EN to 1 if bkops is supported?
BKOPS_EN=1 will enable periodic background operations. The card will
somehow decide periodically when to start background operations. If
BKOPS_EN=0 the background operations need to be started manually. The
mmc framework could make the decision when to start background
operations.
Using dynamic clock control or suspend/resume may cause the periodic
internal operations to be delayed since it can't run without clocking
or power.
Do you have any test results comparing periodic and manual bkops?
On way forward is to add support for both periodic bkops and manual
bkops and let the device platform_data specify what to use?
Regards,
Per
On Mon, May 2, 2011 at 9:53 PM, Per Forlin <[email protected]> wrote:
> On Fri, Dec 3, 2010 at 1:13 PM, Chuanxiao Dong <[email protected]> wrote:
>> From 984adc755cf2f7966a89e510a50f085e314fe347 Mon Sep 17 00:00:00 2001
>> From: Chuanxiao Dong <[email protected]>
>> Date: Mon, 22 Nov 2010 16:31:12 +0800
>> Subject: [PATCH 1/4] mmc: Enabled background operations feature if eMMC card supports
>>
>> Background operations is a new feature defined in eMMC4.41 standard.
>> Since this feature is opertional for eMMC card, so driver only enable
>> for those eMMC card which supports this feature
>>
>> Signed-off-by: Chuanxiao Dong <[email protected]>
>> ---
>> ?drivers/mmc/core/mmc.c ? | ? 26 ++++++++++++++++++++++++++
>> ?include/linux/mmc/card.h | ? ?2 ++
>> ?include/linux/mmc/mmc.h ?| ? ?3 +++
>> ?3 files changed, 31 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>> index 77f93c3..471ed82 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -310,6 +310,14 @@ static int mmc_read_ext_csd(struct mmc_card *card)
>> ? ? ? ? ? ? ? ? ? ? ? ?ext_csd[EXT_CSD_SEC_FEATURE_SUPPORT];
>> ? ? ? ? ? ? ? ?card->ext_csd.trim_timeout = 300 *
>> ? ? ? ? ? ? ? ? ? ? ? ?ext_csd[EXT_CSD_TRIM_MULT];
>> +
>> + ? ? ? ? ? ? ? /* detect whether the eMMC card support BKOPS */
>> + ? ? ? ? ? ? ? if (ext_csd[EXT_CSD_BKOPS_SUPPORT] & 0x1) {
>> + ? ? ? ? ? ? ? ? ? ? ? card->ext_csd.bkops = 1;
>> + ? ? ? ? ? ? ? ? ? ? ? card->ext_csd.bkops_en =
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ext_csd[EXT_CSD_BKOPS_EN];
>> + ? ? ? ? ? ? ? }
>> +
>> ? ? ? ?}
>>
>> ? ? ? ?if (ext_csd[EXT_CSD_ERASED_MEM_CONT])
>> @@ -484,6 +492,24 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
>> ? ? ? ?}
>>
>> ? ? ? ?/*
>> + ? ? ? ?* enable BKOPS if eMMC card supports.
>> + ? ? ? ?*/
>> + ? ? ? if (card->ext_csd.bkops) {
>> + ? ? ? ? ? ? ? if (!card->ext_csd.bkops_en) {
>> + ? ? ? ? ? ? ? ? ? ? ? err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
>> + ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? EXT_CSD_BKOPS_EN, 1);
> Is it always wise to set BKOPS_EN to 1 if bkops is supported?
> BKOPS_EN=1 will enable periodic background operations. The card will
> somehow decide periodically when to start background operations. If
> BKOPS_EN=0 the background operations need to be started manually. The
> mmc framework could make the decision when to start background
> operations.
BKOP_EN=0 means act like a pre v4.41 device. No maintenance required.
Thanks Bruce for pointing this out to me.
> Using dynamic clock control or suspend/resume may cause the periodic
> internal operations to be delayed since it can't run without clocking
> or power.
> Do you have any test results comparing periodic and manual bkops?
> On way forward is to add support for both periodic bkops and manual
> bkops and let the device platform_data specify what to use?
Please discard this comment.
My concern is when to fire BKOPS_START.
Would it make sense to check the BKOPS_STATUS before going to sleep
and start bkops even if level is only "non critical"? This would defer
sleep until bkops are completed.
Regards,
Per