diff mbox series

[v4] fpga: dfl: Allow Port to be linked to FME's DFL

Message ID 20220427131656.588822-1-tianfei.zhang@intel.com (mailing list archive)
State New
Headers show
Series [v4] fpga: dfl: Allow Port to be linked to FME's DFL | expand

Commit Message

Zhang, Tianfei April 27, 2022, 1:16 p.m. UTC 
From: Matthew Gerlach <matthew.gerlach@linux.intel.com>

Currently we use PORTn_OFFSET to locate PORT DFLs, and PORT DFLs are not
connected FME DFL. But for some cases (e.g. Intel Open FPGA Stack device),
PORT DFLs are connected to FME DFL directly, so we don't need to search
PORT DFLs via PORTn_OFFSET again. If BAR value of PORTn_OFFSET is 0x7
(FME_PORT_OFST_BAR_SKIP) then driver will skip searching the DFL for that
port. If BAR value is invalid, return -EINVAL.

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com>
---
v4: move the location of FME_PORT_OFST_BAR_SKIP definition.
v3: remove dev_dbg and use goto instead of break.
v2: return -EINVAL if bar number invalid.
---
 drivers/fpga/dfl-pci.c | 10 ++++++++++
 drivers/fpga/dfl.h     |  1 +
 2 files changed, 11 insertions(+)

Comments

Xu Yilun April 30, 2022, 2:12 p.m. UTC | #1 
On Wed, Apr 27, 2022 at 09:16:56AM -0400, Tianfei Zhang wrote:
> From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> 
> Currently we use PORTn_OFFSET to locate PORT DFLs, and PORT DFLs are not
> connected FME DFL. But for some cases (e.g. Intel Open FPGA Stack device),
> PORT DFLs are connected to FME DFL directly, so we don't need to search
> PORT DFLs via PORTn_OFFSET again. If BAR value of PORTn_OFFSET is 0x7
> (FME_PORT_OFST_BAR_SKIP) then driver will skip searching the DFL for that
> port. If BAR value is invalid, return -EINVAL.
> 
> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com>

Acked-by: Xu Yilun <yilun.xu@intel.com>

> ---
> v4: move the location of FME_PORT_OFST_BAR_SKIP definition.
> v3: remove dev_dbg and use goto instead of break.
> v2: return -EINVAL if bar number invalid.
> ---
>  drivers/fpga/dfl-pci.c | 10 ++++++++++
>  drivers/fpga/dfl.h     |  1 +
>  2 files changed, 11 insertions(+)
> 
> diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
> index 86ed9e4223d3..dac45f96c326 100644
> --- a/drivers/fpga/dfl-pci.c
> +++ b/drivers/fpga/dfl-pci.c
> @@ -263,6 +263,15 @@ static int find_dfls_by_default(struct pci_dev *pcidev,
>  			 */
>  			bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
>  			offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
> +			if (bar == FME_PORT_OFST_BAR_SKIP) {
> +				continue;
> +			} else if (bar >= PCI_STD_NUM_BARS) {
> +				dev_err(&pcidev->dev, "bad BAR %d for port %d\n",
> +					bar, i);
> +				ret = -EINVAL;
> +				goto unmap_exit;
> +			}
> +
>  			start = pci_resource_start(pcidev, bar) + offset;
>  			len = pci_resource_len(pcidev, bar) - offset;
>  
> @@ -277,6 +286,7 @@ static int find_dfls_by_default(struct pci_dev *pcidev,
>  		ret = -ENODEV;
>  	}
>  
> +unmap_exit:
>  	/* release I/O mappings for next step enumeration */
>  	pcim_iounmap_regions(pcidev, BIT(0));
>  
> diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
> index 53572c7aced0..06cfcd5e84bb 100644
> --- a/drivers/fpga/dfl.h
> +++ b/drivers/fpga/dfl.h
> @@ -89,6 +89,7 @@
>  #define FME_HDR_NEXT_AFU	NEXT_AFU
>  #define FME_HDR_CAP		0x30
>  #define FME_HDR_PORT_OFST(n)	(0x38 + ((n) * 0x8))
> +#define FME_PORT_OFST_BAR_SKIP	7
>  #define FME_HDR_BITSTREAM_ID	0x60
>  #define FME_HDR_BITSTREAM_MD	0x68
>  
> -- 
> 2.26.2
Wu, Hao May 5, 2022, 6:37 a.m. UTC | #2 
> On Wed, Apr 27, 2022 at 09:16:56AM -0400, Tianfei Zhang wrote:
> > From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> >
> > Currently we use PORTn_OFFSET to locate PORT DFLs, and PORT DFLs are not
> > connected FME DFL. But for some cases (e.g. Intel Open FPGA Stack device),
> > PORT DFLs are connected to FME DFL directly, so we don't need to search
> > PORT DFLs via PORTn_OFFSET again. If BAR value of PORTn_OFFSET is 0x7
> > (FME_PORT_OFST_BAR_SKIP) then driver will skip searching the DFL for that
> > port. If BAR value is invalid, return -EINVAL.
> >
> > Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> > Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com>
> 
> Acked-by: Xu Yilun <yilun.xu@intel.com>
> 

Hi Tianfei

Please use break instead of goto (just synced with Yilun), then add

Acked-by: Wu Hao <hao.wu@intel.com>

Thanks
Hao

> > ---
> > v4: move the location of FME_PORT_OFST_BAR_SKIP definition.
> > v3: remove dev_dbg and use goto instead of break.
> > v2: return -EINVAL if bar number invalid.
> > ---
> >  drivers/fpga/dfl-pci.c | 10 ++++++++++
> >  drivers/fpga/dfl.h     |  1 +
> >  2 files changed, 11 insertions(+)
> >
> > diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
> > index 86ed9e4223d3..dac45f96c326 100644
> > --- a/drivers/fpga/dfl-pci.c
> > +++ b/drivers/fpga/dfl-pci.c
> > @@ -263,6 +263,15 @@ static int find_dfls_by_default(struct pci_dev *pcidev,
> >  			 */
> >  			bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
> >  			offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
> > +			if (bar == FME_PORT_OFST_BAR_SKIP) {
> > +				continue;
> > +			} else if (bar >= PCI_STD_NUM_BARS) {
> > +				dev_err(&pcidev->dev, "bad BAR %d for
> port %d\n",
> > +					bar, i);
> > +				ret = -EINVAL;
> > +				goto unmap_exit;
> > +			}
> > +
> >  			start = pci_resource_start(pcidev, bar) + offset;
> >  			len = pci_resource_len(pcidev, bar) - offset;
> >
> > @@ -277,6 +286,7 @@ static int find_dfls_by_default(struct pci_dev *pcidev,
> >  		ret = -ENODEV;
> >  	}
> >
> > +unmap_exit:
> >  	/* release I/O mappings for next step enumeration */
> >  	pcim_iounmap_regions(pcidev, BIT(0));
> >
> > diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
> > index 53572c7aced0..06cfcd5e84bb 100644
> > --- a/drivers/fpga/dfl.h
> > +++ b/drivers/fpga/dfl.h
> > @@ -89,6 +89,7 @@
> >  #define FME_HDR_NEXT_AFU	NEXT_AFU
> >  #define FME_HDR_CAP		0x30
> >  #define FME_HDR_PORT_OFST(n)	(0x38 + ((n) * 0x8))
> > +#define FME_PORT_OFST_BAR_SKIP	7
> >  #define FME_HDR_BITSTREAM_ID	0x60
> >  #define FME_HDR_BITSTREAM_MD	0x68
> >
> > --
> > 2.26.2
Zhang, Tianfei May 5, 2022, 6:39 a.m. UTC | #3 
> -----Original Message-----
> From: Wu, Hao <hao.wu@intel.com>
> Sent: Thursday, May 5, 2022 2:38 PM
> To: Xu, Yilun <yilun.xu@intel.com>; Zhang, Tianfei <tianfei.zhang@intel.com>
> Cc: trix@redhat.com; mdf@kernel.org; linux-fpga@vger.kernel.org; Matthew
> Gerlach <matthew.gerlach@linux.intel.com>
> Subject: RE: [PATCH v4] fpga: dfl: Allow Port to be linked to FME's DFL
> 
> > On Wed, Apr 27, 2022 at 09:16:56AM -0400, Tianfei Zhang wrote:
> > > From: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> > >
> > > Currently we use PORTn_OFFSET to locate PORT DFLs, and PORT DFLs are
> > > not connected FME DFL. But for some cases (e.g. Intel Open FPGA
> > > Stack device), PORT DFLs are connected to FME DFL directly, so we
> > > don't need to search PORT DFLs via PORTn_OFFSET again. If BAR value
> > > of PORTn_OFFSET is 0x7
> > > (FME_PORT_OFST_BAR_SKIP) then driver will skip searching the DFL for
> > > that port. If BAR value is invalid, return -EINVAL.
> > >
> > > Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
> > > Signed-off-by: Tianfei Zhang <tianfei.zhang@intel.com>
> >
> > Acked-by: Xu Yilun <yilun.xu@intel.com>
> >
> 
> Hi Tianfei
> 
> Please use break instead of goto (just synced with Yilun), then add
> 
> Acked-by: Wu Hao <hao.wu@intel.com>

Thanks Hao, I will use "break" on the new one.
> 
> Thanks
> Hao
> 
> > > ---
> > > v4: move the location of FME_PORT_OFST_BAR_SKIP definition.
> > > v3: remove dev_dbg and use goto instead of break.
> > > v2: return -EINVAL if bar number invalid.
> > > ---
> > >  drivers/fpga/dfl-pci.c | 10 ++++++++++
> > >  drivers/fpga/dfl.h     |  1 +
> > >  2 files changed, 11 insertions(+)
> > >
> > > diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c index
> > > 86ed9e4223d3..dac45f96c326 100644
> > > --- a/drivers/fpga/dfl-pci.c
> > > +++ b/drivers/fpga/dfl-pci.c
> > > @@ -263,6 +263,15 @@ static int find_dfls_by_default(struct pci_dev
> *pcidev,
> > >  			 */
> > >  			bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
> > >  			offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
> > > +			if (bar == FME_PORT_OFST_BAR_SKIP) {
> > > +				continue;
> > > +			} else if (bar >= PCI_STD_NUM_BARS) {
> > > +				dev_err(&pcidev->dev, "bad BAR %d for
> > port %d\n",
> > > +					bar, i);
> > > +				ret = -EINVAL;
> > > +				goto unmap_exit;
> > > +			}
> > > +
> > >  			start = pci_resource_start(pcidev, bar) + offset;
> > >  			len = pci_resource_len(pcidev, bar) - offset;
> > >
> > > @@ -277,6 +286,7 @@ static int find_dfls_by_default(struct pci_dev
> *pcidev,
> > >  		ret = -ENODEV;
> > >  	}
> > >
> > > +unmap_exit:
> > >  	/* release I/O mappings for next step enumeration */
> > >  	pcim_iounmap_regions(pcidev, BIT(0));
> > >
> > > diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h index
> > > 53572c7aced0..06cfcd5e84bb 100644
> > > --- a/drivers/fpga/dfl.h
> > > +++ b/drivers/fpga/dfl.h
> > > @@ -89,6 +89,7 @@
> > >  #define FME_HDR_NEXT_AFU	NEXT_AFU
> > >  #define FME_HDR_CAP		0x30
> > >  #define FME_HDR_PORT_OFST(n)	(0x38 + ((n) * 0x8))
> > > +#define FME_PORT_OFST_BAR_SKIP	7
> > >  #define FME_HDR_BITSTREAM_ID	0x60
> > >  #define FME_HDR_BITSTREAM_MD	0x68
> > >
> > > --
> > > 2.26.2
diff mbox series

Patch

diff --git a/drivers/fpga/dfl-pci.c b/drivers/fpga/dfl-pci.c
index 86ed9e4223d3..dac45f96c326 100644
--- a/drivers/fpga/dfl-pci.c
+++ b/drivers/fpga/dfl-pci.c
@@ -263,6 +263,15 @@  static int find_dfls_by_default(struct pci_dev *pcidev,
 			 */
 			bar = FIELD_GET(FME_PORT_OFST_BAR_ID, v);
 			offset = FIELD_GET(FME_PORT_OFST_DFH_OFST, v);
+			if (bar == FME_PORT_OFST_BAR_SKIP) {
+				continue;
+			} else if (bar >= PCI_STD_NUM_BARS) {
+				dev_err(&pcidev->dev, "bad BAR %d for port %d\n",
+					bar, i);
+				ret = -EINVAL;
+				goto unmap_exit;
+			}
+
 			start = pci_resource_start(pcidev, bar) + offset;
 			len = pci_resource_len(pcidev, bar) - offset;
 
@@ -277,6 +286,7 @@  static int find_dfls_by_default(struct pci_dev *pcidev,
 		ret = -ENODEV;
 	}
 
+unmap_exit:
 	/* release I/O mappings for next step enumeration */
 	pcim_iounmap_regions(pcidev, BIT(0));
 
diff --git a/drivers/fpga/dfl.h b/drivers/fpga/dfl.h
index 53572c7aced0..06cfcd5e84bb 100644
--- a/drivers/fpga/dfl.h
+++ b/drivers/fpga/dfl.h
@@ -89,6 +89,7 @@ 
 #define FME_HDR_NEXT_AFU	NEXT_AFU
 #define FME_HDR_CAP		0x30
 #define FME_HDR_PORT_OFST(n)	(0x38 + ((n) * 0x8))
+#define FME_PORT_OFST_BAR_SKIP	7
 #define FME_HDR_BITSTREAM_ID	0x60
 #define FME_HDR_BITSTREAM_MD	0x68