diff mbox series

[RESEND,v10,04/10] scsi: ufs: introduce UFSHCD_QUIRK_PRDT_BYTE_GRAN quirk

Message ID 20200613024706.27975-5-alim.akhtar@samsung.com (mailing list archive)
State Not Applicable
Headers show
Series exynos-ufs: Add support for UFS HCI | expand

Commit Message

Alim Akhtar June 13, 2020, 2:47 a.m. UTC 
Some UFS host controllers like Exynos uses granularities of PRDT length and
offset as bytes, whereas others uses actual segment count.

Reviewed-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
---
 drivers/scsi/ufs/ufshcd.c | 30 +++++++++++++++++++++++-------
 drivers/scsi/ufs/ufshcd.h |  6 ++++++
 2 files changed, 29 insertions(+), 7 deletions(-)

Comments

Eric Biggers Aug. 12, 2020, 12:29 a.m. UTC | #1 
Hi Alim,

On Sat, Jun 13, 2020 at 08:17:00AM +0530, Alim Akhtar wrote:
> Some UFS host controllers like Exynos uses granularities of PRDT length and
> offset as bytes, whereas others uses actual segment count.
> 
> Reviewed-by: Avri Altman <avri.altman@wdc.com>
> Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
> Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
> ---
>  drivers/scsi/ufs/ufshcd.c | 30 +++++++++++++++++++++++-------
>  drivers/scsi/ufs/ufshcd.h |  6 ++++++
>  2 files changed, 29 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index ee30ed6cc805..ba093d0d0942 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -2151,8 +2151,14 @@ static int ufshcd_map_sg(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
>  		return sg_segments;
>  
>  	if (sg_segments) {
> -		lrbp->utr_descriptor_ptr->prd_table_length =
> -			cpu_to_le16((u16)sg_segments);
> +
> +		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
> +			lrbp->utr_descriptor_ptr->prd_table_length =
> +				cpu_to_le16((sg_segments *
> +					sizeof(struct ufshcd_sg_entry)));
> +		else
> +			lrbp->utr_descriptor_ptr->prd_table_length =
> +				cpu_to_le16((u16) (sg_segments));
>  
>  		prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;
>  
> @@ -3500,11 +3506,21 @@ static void ufshcd_host_memory_configure(struct ufs_hba *hba)
>  				cpu_to_le32(upper_32_bits(cmd_desc_element_addr));
>  
>  		/* Response upiu and prdt offset should be in double words */
> -		utrdlp[i].response_upiu_offset =
> -			cpu_to_le16(response_offset >> 2);
> -		utrdlp[i].prd_table_offset = cpu_to_le16(prdt_offset >> 2);
> -		utrdlp[i].response_upiu_length =
> -			cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> +		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN) {
> +			utrdlp[i].response_upiu_offset =
> +				cpu_to_le16(response_offset);
> +			utrdlp[i].prd_table_offset =
> +				cpu_to_le16(prdt_offset);
> +			utrdlp[i].response_upiu_length =
> +				cpu_to_le16(ALIGNED_UPIU_SIZE);
> +		} else {
> +			utrdlp[i].response_upiu_offset =
> +				cpu_to_le16(response_offset >> 2);
> +			utrdlp[i].prd_table_offset =
> +				cpu_to_le16(prdt_offset >> 2);
> +			utrdlp[i].response_upiu_length =
> +				cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> +		}
>  
>  		ufshcd_init_lrb(hba, &hba->lrb[i], i);
>  	}

Isn't this patch missing an update to ufshcd_print_trs()?  It uses
->prd_table_length as the number of segments, not the number of bytes.

- Eric
Alim Akhtar Aug. 13, 2020, 1:21 a.m. UTC | #2 
Hi Eric,

> -----Original Message-----
> From: Eric Biggers <ebiggers@kernel.org>
> Sent: 12 August 2020 05:59
> To: Alim Akhtar <alim.akhtar@samsung.com>
> Cc: robh@kernel.org; devicetree@vger.kernel.org;
linux-scsi@vger.kernel.org;
> krzk@kernel.org; avri.altman@wdc.com; martin.petersen@oracle.com;
> kwmad.kim@samsung.com; stanley.chu@mediatek.com;
> cang@codeaurora.org; linux-samsung-soc@vger.kernel.org; linux-arm-
> kernel@lists.infradead.org; linux-kernel@vger.kernel.org; kishon@ti.com
> Subject: Re: [RESEND PATCH v10 04/10] scsi: ufs: introduce
> UFSHCD_QUIRK_PRDT_BYTE_GRAN quirk
> 
> Hi Alim,
> 
> On Sat, Jun 13, 2020 at 08:17:00AM +0530, Alim Akhtar wrote:
> > Some UFS host controllers like Exynos uses granularities of PRDT
> > length and offset as bytes, whereas others uses actual segment count.
> >
> > Reviewed-by: Avri Altman <avri.altman@wdc.com>
> > Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
> > Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
> > ---
> >  drivers/scsi/ufs/ufshcd.c | 30 +++++++++++++++++++++++-------
> > drivers/scsi/ufs/ufshcd.h |  6 ++++++
> >  2 files changed, 29 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> > index ee30ed6cc805..ba093d0d0942 100644
> > --- a/drivers/scsi/ufs/ufshcd.c
> > +++ b/drivers/scsi/ufs/ufshcd.c
> > @@ -2151,8 +2151,14 @@ static int ufshcd_map_sg(struct ufs_hba *hba,
> struct ufshcd_lrb *lrbp)
> >  		return sg_segments;
> >
> >  	if (sg_segments) {
> > -		lrbp->utr_descriptor_ptr->prd_table_length =
> > -			cpu_to_le16((u16)sg_segments);
> > +
> > +		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
> > +			lrbp->utr_descriptor_ptr->prd_table_length =
> > +				cpu_to_le16((sg_segments *
> > +					sizeof(struct ufshcd_sg_entry)));
> > +		else
> > +			lrbp->utr_descriptor_ptr->prd_table_length =
> > +				cpu_to_le16((u16) (sg_segments));
> >
> >  		prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;
> >
> > @@ -3500,11 +3506,21 @@ static void
> ufshcd_host_memory_configure(struct ufs_hba *hba)
> >
> 	cpu_to_le32(upper_32_bits(cmd_desc_element_addr));
> >
> >  		/* Response upiu and prdt offset should be in double words
*/
> > -		utrdlp[i].response_upiu_offset =
> > -			cpu_to_le16(response_offset >> 2);
> > -		utrdlp[i].prd_table_offset = cpu_to_le16(prdt_offset >> 2);
> > -		utrdlp[i].response_upiu_length =
> > -			cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> > +		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN) {
> > +			utrdlp[i].response_upiu_offset =
> > +				cpu_to_le16(response_offset);
> > +			utrdlp[i].prd_table_offset =
> > +				cpu_to_le16(prdt_offset);
> > +			utrdlp[i].response_upiu_length =
> > +				cpu_to_le16(ALIGNED_UPIU_SIZE);
> > +		} else {
> > +			utrdlp[i].response_upiu_offset =
> > +				cpu_to_le16(response_offset >> 2);
> > +			utrdlp[i].prd_table_offset =
> > +				cpu_to_le16(prdt_offset >> 2);
> > +			utrdlp[i].response_upiu_length =
> > +				cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> > +		}
> >
> >  		ufshcd_init_lrb(hba, &hba->lrb[i], i);
> >  	}
> 
> Isn't this patch missing an update to ufshcd_print_trs()?  It uses
> ->prd_table_length as the number of segments, not the number of bytes.
> 
prd_table_length will be populated before it reaches ufshcd_print_trs()
based on UFSHCD_QUIRK_PRDT_BYTE_GRAN.

> - Eric
Eric Biggers Aug. 13, 2020, 1:25 a.m. UTC | #3 
On Thu, Aug 13, 2020 at 06:51:13AM +0530, Alim Akhtar wrote:
> Hi Eric,
> 
> > -----Original Message-----
> > From: Eric Biggers <ebiggers@kernel.org>
> > Sent: 12 August 2020 05:59
> > To: Alim Akhtar <alim.akhtar@samsung.com>
> > Cc: robh@kernel.org; devicetree@vger.kernel.org;
> linux-scsi@vger.kernel.org;
> > krzk@kernel.org; avri.altman@wdc.com; martin.petersen@oracle.com;
> > kwmad.kim@samsung.com; stanley.chu@mediatek.com;
> > cang@codeaurora.org; linux-samsung-soc@vger.kernel.org; linux-arm-
> > kernel@lists.infradead.org; linux-kernel@vger.kernel.org; kishon@ti.com
> > Subject: Re: [RESEND PATCH v10 04/10] scsi: ufs: introduce
> > UFSHCD_QUIRK_PRDT_BYTE_GRAN quirk
> > 
> > Hi Alim,
> > 
> > On Sat, Jun 13, 2020 at 08:17:00AM +0530, Alim Akhtar wrote:
> > > Some UFS host controllers like Exynos uses granularities of PRDT
> > > length and offset as bytes, whereas others uses actual segment count.
> > >
> > > Reviewed-by: Avri Altman <avri.altman@wdc.com>
> > > Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
> > > Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
> > > ---
> > >  drivers/scsi/ufs/ufshcd.c | 30 +++++++++++++++++++++++-------
> > > drivers/scsi/ufs/ufshcd.h |  6 ++++++
> > >  2 files changed, 29 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> > > index ee30ed6cc805..ba093d0d0942 100644
> > > --- a/drivers/scsi/ufs/ufshcd.c
> > > +++ b/drivers/scsi/ufs/ufshcd.c
> > > @@ -2151,8 +2151,14 @@ static int ufshcd_map_sg(struct ufs_hba *hba,
> > struct ufshcd_lrb *lrbp)
> > >  		return sg_segments;
> > >
> > >  	if (sg_segments) {
> > > -		lrbp->utr_descriptor_ptr->prd_table_length =
> > > -			cpu_to_le16((u16)sg_segments);
> > > +
> > > +		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
> > > +			lrbp->utr_descriptor_ptr->prd_table_length =
> > > +				cpu_to_le16((sg_segments *
> > > +					sizeof(struct ufshcd_sg_entry)));
> > > +		else
> > > +			lrbp->utr_descriptor_ptr->prd_table_length =
> > > +				cpu_to_le16((u16) (sg_segments));
> > >
> > >  		prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;
> > >
> > > @@ -3500,11 +3506,21 @@ static void
> > ufshcd_host_memory_configure(struct ufs_hba *hba)
> > >
> > 	cpu_to_le32(upper_32_bits(cmd_desc_element_addr));
> > >
> > >  		/* Response upiu and prdt offset should be in double words
> */
> > > -		utrdlp[i].response_upiu_offset =
> > > -			cpu_to_le16(response_offset >> 2);
> > > -		utrdlp[i].prd_table_offset = cpu_to_le16(prdt_offset >> 2);
> > > -		utrdlp[i].response_upiu_length =
> > > -			cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> > > +		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN) {
> > > +			utrdlp[i].response_upiu_offset =
> > > +				cpu_to_le16(response_offset);
> > > +			utrdlp[i].prd_table_offset =
> > > +				cpu_to_le16(prdt_offset);
> > > +			utrdlp[i].response_upiu_length =
> > > +				cpu_to_le16(ALIGNED_UPIU_SIZE);
> > > +		} else {
> > > +			utrdlp[i].response_upiu_offset =
> > > +				cpu_to_le16(response_offset >> 2);
> > > +			utrdlp[i].prd_table_offset =
> > > +				cpu_to_le16(prdt_offset >> 2);
> > > +			utrdlp[i].response_upiu_length =
> > > +				cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
> > > +		}
> > >
> > >  		ufshcd_init_lrb(hba, &hba->lrb[i], i);
> > >  	}
> > 
> > Isn't this patch missing an update to ufshcd_print_trs()?  It uses
> > ->prd_table_length as the number of segments, not the number of bytes.
> > 
> prd_table_length will be populated before it reaches ufshcd_print_trs()
> based on UFSHCD_QUIRK_PRDT_BYTE_GRAN.
> 

Yes, which is why it seems ufshcd_print_trs() needs to be updated to take
UFSHCD_QUIRK_PRDT_BYTE_GRAN into account.

- Eric
diff mbox series

Patch

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index ee30ed6cc805..ba093d0d0942 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2151,8 +2151,14 @@  static int ufshcd_map_sg(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 		return sg_segments;
 
 	if (sg_segments) {
-		lrbp->utr_descriptor_ptr->prd_table_length =
-			cpu_to_le16((u16)sg_segments);
+
+		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN)
+			lrbp->utr_descriptor_ptr->prd_table_length =
+				cpu_to_le16((sg_segments *
+					sizeof(struct ufshcd_sg_entry)));
+		else
+			lrbp->utr_descriptor_ptr->prd_table_length =
+				cpu_to_le16((u16) (sg_segments));
 
 		prd_table = (struct ufshcd_sg_entry *)lrbp->ucd_prdt_ptr;
 
@@ -3500,11 +3506,21 @@  static void ufshcd_host_memory_configure(struct ufs_hba *hba)
 				cpu_to_le32(upper_32_bits(cmd_desc_element_addr));
 
 		/* Response upiu and prdt offset should be in double words */
-		utrdlp[i].response_upiu_offset =
-			cpu_to_le16(response_offset >> 2);
-		utrdlp[i].prd_table_offset = cpu_to_le16(prdt_offset >> 2);
-		utrdlp[i].response_upiu_length =
-			cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
+		if (hba->quirks & UFSHCD_QUIRK_PRDT_BYTE_GRAN) {
+			utrdlp[i].response_upiu_offset =
+				cpu_to_le16(response_offset);
+			utrdlp[i].prd_table_offset =
+				cpu_to_le16(prdt_offset);
+			utrdlp[i].response_upiu_length =
+				cpu_to_le16(ALIGNED_UPIU_SIZE);
+		} else {
+			utrdlp[i].response_upiu_offset =
+				cpu_to_le16(response_offset >> 2);
+			utrdlp[i].prd_table_offset =
+				cpu_to_le16(prdt_offset >> 2);
+			utrdlp[i].response_upiu_length =
+				cpu_to_le16(ALIGNED_UPIU_SIZE >> 2);
+		}
 
 		ufshcd_init_lrb(hba, &hba->lrb[i], i);
 	}
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index f8d08cb9caf7..a9b9ace9fc72 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -535,6 +535,12 @@  enum ufshcd_quirks {
 	 * enabled via HCE register.
 	 */
 	UFSHCI_QUIRK_BROKEN_HCE				= 1 << 8,
+
+	/*
+	 * This quirk needs to be enabled if the host controller regards
+	 * resolution of the values of PRDTO and PRDTL in UTRD as byte.
+	 */
+	UFSHCD_QUIRK_PRDT_BYTE_GRAN			= 1 << 9,
 };
 
 enum ufshcd_caps {