* [PATCH v2] ufs: adjust queue settings to PRDT limitations
@ 2013-09-25 13:47 Akinobu Mita
2013-09-26 6:59 ` Subhash Jadavani
2013-10-11 5:05 ` vinayak holikatti
0 siblings, 2 replies; 6+ messages in thread
From: Akinobu Mita @ 2013-09-25 13:47 UTC (permalink / raw)
To: linux-scsi
Cc: Akinobu Mita, Subhash Jadavani, Vinayak Holikatti, Santosh Y,
James E.J. Bottomley
The data byte count field of PRDT indicates the length of data block
which is a segment of data transfer for SCSI commands. The value of
this field shall have Dword granularity and the the maximum of length
is 256KB.
This adjusts dma pad mask and max segment size to the above-mentioned
PRDT limitations.
Signed-off-by: Akinobu Mita <mita@fixstars.com>
Cc: Subhash Jadavani <subhashj@codeaurora.org>
Cc: Vinayak Holikatti <vinholikatti@gmail.com>
Cc: Santosh Y <santoshsy@gmail.com>
Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
Cc: linux-scsi@vger.kernel.org
---
* Change from v1
- Add comments for PRDT limitations as suggested by Subhash Jadavani
drivers/scsi/ufs/ufshcd.c | 15 +++++++++++++++
drivers/scsi/ufs/ufshci.h | 5 +++++
2 files changed, 20 insertions(+)
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index a2abe9a..660792e 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -1918,6 +1918,20 @@ static int ufshcd_slave_alloc(struct scsi_device *sdev)
}
/**
+ * ufshcd_slave_configure - adjust SCSI device configurations
+ * @sdev: pointer to SCSI device
+ */
+static int ufshcd_slave_configure(struct scsi_device *sdev)
+{
+ struct request_queue *q = sdev->request_queue;
+
+ blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
+ blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
+
+ return 0;
+}
+
+/**
* ufshcd_slave_destroy - remove SCSI device configurations
* @sdev: pointer to SCSI device
*/
@@ -2748,6 +2762,7 @@ static struct scsi_host_template ufshcd_driver_template = {
.proc_name = UFSHCD,
.queuecommand = ufshcd_queuecommand,
.slave_alloc = ufshcd_slave_alloc,
+ .slave_configure = ufshcd_slave_configure,
.slave_destroy = ufshcd_slave_destroy,
.eh_abort_handler = ufshcd_abort,
.eh_device_reset_handler = ufshcd_device_reset,
diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
index 0475c66..b2b7004 100644
--- a/drivers/scsi/ufs/ufshci.h
+++ b/drivers/scsi/ufs/ufshci.h
@@ -296,6 +296,11 @@ enum {
MASK_OCS = 0x0F,
};
+/* The maximum length of the data byte count field in the PRDT is 256KB */
+#define PRDT_DATA_BYTE_COUNT_MAX (256 * 1024)
+/* The granularity of the data byte count field in the PRDT is 32-bit */
+#define PRDT_DATA_BYTE_COUNT_PAD 4
+
/**
* struct ufshcd_sg_entry - UFSHCI PRD Entry
* @base_addr: Lower 32bit physical address DW-0
--
1.8.3.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH v2] ufs: adjust queue settings to PRDT limitations
2013-09-25 13:47 [PATCH v2] ufs: adjust queue settings to PRDT limitations Akinobu Mita
@ 2013-09-26 6:59 ` Subhash Jadavani
2013-09-29 10:18 ` Dolev Raviv
2013-10-11 5:05 ` vinayak holikatti
1 sibling, 1 reply; 6+ messages in thread
From: Subhash Jadavani @ 2013-09-26 6:59 UTC (permalink / raw)
To: Akinobu Mita
Cc: linux-scsi, Vinayak Holikatti, Santosh Y, James E.J. Bottomley
Looks good to me.
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
On 9/25/2013 7:17 PM, Akinobu Mita wrote:
> The data byte count field of PRDT indicates the length of data block
> which is a segment of data transfer for SCSI commands. The value of
> this field shall have Dword granularity and the the maximum of length
> is 256KB.
>
> This adjusts dma pad mask and max segment size to the above-mentioned
> PRDT limitations.
>
> Signed-off-by: Akinobu Mita <mita@fixstars.com>
> Cc: Subhash Jadavani <subhashj@codeaurora.org>
> Cc: Vinayak Holikatti <vinholikatti@gmail.com>
> Cc: Santosh Y <santoshsy@gmail.com>
> Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
> Cc: linux-scsi@vger.kernel.org
> ---
> * Change from v1
> - Add comments for PRDT limitations as suggested by Subhash Jadavani
>
> drivers/scsi/ufs/ufshcd.c | 15 +++++++++++++++
> drivers/scsi/ufs/ufshci.h | 5 +++++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index a2abe9a..660792e 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -1918,6 +1918,20 @@ static int ufshcd_slave_alloc(struct scsi_device *sdev)
> }
>
> /**
> + * ufshcd_slave_configure - adjust SCSI device configurations
> + * @sdev: pointer to SCSI device
> + */
> +static int ufshcd_slave_configure(struct scsi_device *sdev)
> +{
> + struct request_queue *q = sdev->request_queue;
> +
> + blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
> + blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
> +
> + return 0;
> +}
> +
> +/**
> * ufshcd_slave_destroy - remove SCSI device configurations
> * @sdev: pointer to SCSI device
> */
> @@ -2748,6 +2762,7 @@ static struct scsi_host_template ufshcd_driver_template = {
> .proc_name = UFSHCD,
> .queuecommand = ufshcd_queuecommand,
> .slave_alloc = ufshcd_slave_alloc,
> + .slave_configure = ufshcd_slave_configure,
> .slave_destroy = ufshcd_slave_destroy,
> .eh_abort_handler = ufshcd_abort,
> .eh_device_reset_handler = ufshcd_device_reset,
> diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
> index 0475c66..b2b7004 100644
> --- a/drivers/scsi/ufs/ufshci.h
> +++ b/drivers/scsi/ufs/ufshci.h
> @@ -296,6 +296,11 @@ enum {
> MASK_OCS = 0x0F,
> };
>
> +/* The maximum length of the data byte count field in the PRDT is 256KB */
> +#define PRDT_DATA_BYTE_COUNT_MAX (256 * 1024)
> +/* The granularity of the data byte count field in the PRDT is 32-bit */
> +#define PRDT_DATA_BYTE_COUNT_PAD 4
> +
> /**
> * struct ufshcd_sg_entry - UFSHCI PRD Entry
> * @base_addr: Lower 32bit physical address DW-0
^ permalink raw reply [flat|nested] 6+ messages in thread* RE: [PATCH v2] ufs: adjust queue settings to PRDT limitations
2013-09-26 6:59 ` Subhash Jadavani
@ 2013-09-29 10:18 ` Dolev Raviv
0 siblings, 0 replies; 6+ messages in thread
From: Dolev Raviv @ 2013-09-29 10:18 UTC (permalink / raw)
To: 'Subhash Jadavani', 'Akinobu Mita'
Cc: linux-scsi, 'Vinayak Holikatti', 'Santosh Y',
'James E.J. Bottomley'
Works on my setup.
Tested-by: Dolev Raviv <draviv@codeaurora.org>
Thanks,
Dolev
--
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
-----Original Message-----
From: linux-scsi-owner@vger.kernel.org
[mailto:linux-scsi-owner@vger.kernel.org] On Behalf Of Subhash Jadavani
Sent: Thursday, September 26, 2013 9:59 AM
To: Akinobu Mita
Cc: linux-scsi@vger.kernel.org; Vinayak Holikatti; Santosh Y; James E.J.
Bottomley
Subject: Re: [PATCH v2] ufs: adjust queue settings to PRDT limitations
Looks good to me.
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
On 9/25/2013 7:17 PM, Akinobu Mita wrote:
> The data byte count field of PRDT indicates the length of data block
> which is a segment of data transfer for SCSI commands. The value of
> this field shall have Dword granularity and the the maximum of length
> is 256KB.
>
> This adjusts dma pad mask and max segment size to the above-mentioned
> PRDT limitations.
>
> Signed-off-by: Akinobu Mita <mita@fixstars.com>
> Cc: Subhash Jadavani <subhashj@codeaurora.org>
> Cc: Vinayak Holikatti <vinholikatti@gmail.com>
> Cc: Santosh Y <santoshsy@gmail.com>
> Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
> Cc: linux-scsi@vger.kernel.org
> ---
> * Change from v1
> - Add comments for PRDT limitations as suggested by Subhash Jadavani
>
> drivers/scsi/ufs/ufshcd.c | 15 +++++++++++++++
> drivers/scsi/ufs/ufshci.h | 5 +++++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index a2abe9a..660792e 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -1918,6 +1918,20 @@ static int ufshcd_slave_alloc(struct scsi_device
*sdev)
> }
>
> /**
> + * ufshcd_slave_configure - adjust SCSI device configurations
> + * @sdev: pointer to SCSI device
> + */
> +static int ufshcd_slave_configure(struct scsi_device *sdev) {
> + struct request_queue *q = sdev->request_queue;
> +
> + blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
> + blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
> +
> + return 0;
> +}
> +
> +/**
> * ufshcd_slave_destroy - remove SCSI device configurations
> * @sdev: pointer to SCSI device
> */
> @@ -2748,6 +2762,7 @@ static struct scsi_host_template
ufshcd_driver_template = {
> .proc_name = UFSHCD,
> .queuecommand = ufshcd_queuecommand,
> .slave_alloc = ufshcd_slave_alloc,
> + .slave_configure = ufshcd_slave_configure,
> .slave_destroy = ufshcd_slave_destroy,
> .eh_abort_handler = ufshcd_abort,
> .eh_device_reset_handler = ufshcd_device_reset, diff --git
> a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h index
> 0475c66..b2b7004 100644
> --- a/drivers/scsi/ufs/ufshci.h
> +++ b/drivers/scsi/ufs/ufshci.h
> @@ -296,6 +296,11 @@ enum {
> MASK_OCS = 0x0F,
> };
>
> +/* The maximum length of the data byte count field in the PRDT is 256KB
*/
> +#define PRDT_DATA_BYTE_COUNT_MAX (256 * 1024)
> +/* The granularity of the data byte count field in the PRDT is 32-bit */
> +#define PRDT_DATA_BYTE_COUNT_PAD 4
> +
> /**
> * struct ufshcd_sg_entry - UFSHCI PRD Entry
> * @base_addr: Lower 32bit physical address DW-0
--
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2] ufs: adjust queue settings to PRDT limitations
2013-09-25 13:47 [PATCH v2] ufs: adjust queue settings to PRDT limitations Akinobu Mita
2013-09-26 6:59 ` Subhash Jadavani
@ 2013-10-11 5:05 ` vinayak holikatti
2014-07-01 8:53 ` Dolev Raviv
1 sibling, 1 reply; 6+ messages in thread
From: vinayak holikatti @ 2013-10-11 5:05 UTC (permalink / raw)
To: Akinobu Mita
Cc: linux-scsi, Subhash Jadavani, Santosh Y, James E.J. Bottomley
On Wed, Sep 25, 2013 at 7:17 PM, Akinobu Mita <mita@fixstars.com> wrote:
> The data byte count field of PRDT indicates the length of data block
> which is a segment of data transfer for SCSI commands. The value of
> this field shall have Dword granularity and the the maximum of length
> is 256KB.
>
> This adjusts dma pad mask and max segment size to the above-mentioned
> PRDT limitations.
>
> Signed-off-by: Akinobu Mita <mita@fixstars.com>
> Cc: Subhash Jadavani <subhashj@codeaurora.org>
> Cc: Vinayak Holikatti <vinholikatti@gmail.com>
> Cc: Santosh Y <santoshsy@gmail.com>
> Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
> Cc: linux-scsi@vger.kernel.org
> ---
> * Change from v1
> - Add comments for PRDT limitations as suggested by Subhash Jadavani
>
> drivers/scsi/ufs/ufshcd.c | 15 +++++++++++++++
> drivers/scsi/ufs/ufshci.h | 5 +++++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index a2abe9a..660792e 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -1918,6 +1918,20 @@ static int ufshcd_slave_alloc(struct scsi_device *sdev)
> }
>
> /**
> + * ufshcd_slave_configure - adjust SCSI device configurations
> + * @sdev: pointer to SCSI device
> + */
> +static int ufshcd_slave_configure(struct scsi_device *sdev)
> +{
> + struct request_queue *q = sdev->request_queue;
> +
> + blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
> + blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
> +
> + return 0;
> +}
> +
> +/**
> * ufshcd_slave_destroy - remove SCSI device configurations
> * @sdev: pointer to SCSI device
> */
> @@ -2748,6 +2762,7 @@ static struct scsi_host_template ufshcd_driver_template = {
> .proc_name = UFSHCD,
> .queuecommand = ufshcd_queuecommand,
> .slave_alloc = ufshcd_slave_alloc,
> + .slave_configure = ufshcd_slave_configure,
> .slave_destroy = ufshcd_slave_destroy,
> .eh_abort_handler = ufshcd_abort,
> .eh_device_reset_handler = ufshcd_device_reset,
> diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
> index 0475c66..b2b7004 100644
> --- a/drivers/scsi/ufs/ufshci.h
> +++ b/drivers/scsi/ufs/ufshci.h
> @@ -296,6 +296,11 @@ enum {
> MASK_OCS = 0x0F,
> };
>
> +/* The maximum length of the data byte count field in the PRDT is 256KB */
> +#define PRDT_DATA_BYTE_COUNT_MAX (256 * 1024)
> +/* The granularity of the data byte count field in the PRDT is 32-bit */
> +#define PRDT_DATA_BYTE_COUNT_PAD 4
> +
> /**
> * struct ufshcd_sg_entry - UFSHCI PRD Entry
> * @base_addr: Lower 32bit physical address DW-0
Acked-by: Vinayak Holikatti <vinholikatti@gmail.com>
^ permalink raw reply [flat|nested] 6+ messages in thread* RE: [PATCH v2] ufs: adjust queue settings to PRDT limitations
2013-10-11 5:05 ` vinayak holikatti
@ 2014-07-01 8:53 ` Dolev Raviv
2014-07-01 14:05 ` Akinobu Mita
0 siblings, 1 reply; 6+ messages in thread
From: Dolev Raviv @ 2014-07-01 8:53 UTC (permalink / raw)
To: 'vinayak holikatti', 'Akinobu Mita'
Cc: linux-scsi, 'Subhash Jadavani', 'Santosh Y',
'James E.J. Bottomley'
Hi,
I couldn't find this patch in scsi-misc branch. Was it merged somewhere
else?
Thanks,
Dolev
--
QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
-----Original Message-----
From: linux-scsi-owner@vger.kernel.org
[mailto:linux-scsi-owner@vger.kernel.org] On Behalf Of vinayak holikatti
Sent: Friday, October 11, 2013 8:05 AM
To: Akinobu Mita
Cc: linux-scsi@vger.kernel.org; Subhash Jadavani; Santosh Y; James E.J.
Bottomley
Subject: Re: [PATCH v2] ufs: adjust queue settings to PRDT limitations
On Wed, Sep 25, 2013 at 7:17 PM, Akinobu Mita <mita@fixstars.com> wrote:
> The data byte count field of PRDT indicates the length of data block
> which is a segment of data transfer for SCSI commands. The value of
> this field shall have Dword granularity and the the maximum of length
> is 256KB.
>
> This adjusts dma pad mask and max segment size to the above-mentioned
> PRDT limitations.
>
> Signed-off-by: Akinobu Mita <mita@fixstars.com>
> Cc: Subhash Jadavani <subhashj@codeaurora.org>
> Cc: Vinayak Holikatti <vinholikatti@gmail.com>
> Cc: Santosh Y <santoshsy@gmail.com>
> Cc: "James E.J. Bottomley" <JBottomley@parallels.com>
> Cc: linux-scsi@vger.kernel.org
> ---
> * Change from v1
> - Add comments for PRDT limitations as suggested by Subhash Jadavani
>
> drivers/scsi/ufs/ufshcd.c | 15 +++++++++++++++
> drivers/scsi/ufs/ufshci.h | 5 +++++
> 2 files changed, 20 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index a2abe9a..660792e 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -1918,6 +1918,20 @@ static int ufshcd_slave_alloc(struct
> scsi_device *sdev) }
>
> /**
> + * ufshcd_slave_configure - adjust SCSI device configurations
> + * @sdev: pointer to SCSI device
> + */
> +static int ufshcd_slave_configure(struct scsi_device *sdev) {
> + struct request_queue *q = sdev->request_queue;
> +
> + blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
> + blk_queue_max_segment_size(q, PRDT_DATA_BYTE_COUNT_MAX);
> +
> + return 0;
> +}
> +
> +/**
> * ufshcd_slave_destroy - remove SCSI device configurations
> * @sdev: pointer to SCSI device
> */
> @@ -2748,6 +2762,7 @@ static struct scsi_host_template
ufshcd_driver_template = {
> .proc_name = UFSHCD,
> .queuecommand = ufshcd_queuecommand,
> .slave_alloc = ufshcd_slave_alloc,
> + .slave_configure = ufshcd_slave_configure,
> .slave_destroy = ufshcd_slave_destroy,
> .eh_abort_handler = ufshcd_abort,
> .eh_device_reset_handler = ufshcd_device_reset, diff --git
> a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h index
> 0475c66..b2b7004 100644
> --- a/drivers/scsi/ufs/ufshci.h
> +++ b/drivers/scsi/ufs/ufshci.h
> @@ -296,6 +296,11 @@ enum {
> MASK_OCS = 0x0F,
> };
>
> +/* The maximum length of the data byte count field in the PRDT is 256KB
*/
> +#define PRDT_DATA_BYTE_COUNT_MAX (256 * 1024)
> +/* The granularity of the data byte count field in the PRDT is 32-bit */
> +#define PRDT_DATA_BYTE_COUNT_PAD 4
> +
> /**
> * struct ufshcd_sg_entry - UFSHCI PRD Entry
> * @base_addr: Lower 32bit physical address DW-0
Acked-by: Vinayak Holikatti <vinholikatti@gmail.com>
--
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^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2014-07-01 14:14 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2013-09-25 13:47 [PATCH v2] ufs: adjust queue settings to PRDT limitations Akinobu Mita
2013-09-26 6:59 ` Subhash Jadavani
2013-09-29 10:18 ` Dolev Raviv
2013-10-11 5:05 ` vinayak holikatti
2014-07-01 8:53 ` Dolev Raviv
2014-07-01 14:05 ` Akinobu Mita
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