diff mbox series

[v1,3/3] dmaengine: sf-pdma: add mpfs-pdma compatible name

Message ID 20230922095039.74878-4-shravan.chippa@microchip.com (mailing list archive)
State Superseded
Headers show
Series dma: sf-pdma: various sf-pdma updates for the mpfs platform | expand

Commit Message

shravan chippa Sept. 22, 2023, 9:50 a.m. UTC 
From: Shravan Chippa <shravan.chippa@microchip.com>

Sifive platform dma does not allow out-of-order transfers,
buf out-of-order dma has a significant performance advantage.
Add a PolarFire SoC specific compatible and code to support
for out-of-order dma transfers

Signed-off-by: Shravan Chippa <shravan.chippa@microchip.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
---
 drivers/dma/sf-pdma/sf-pdma.c | 27 ++++++++++++++++++++++++---
 drivers/dma/sf-pdma/sf-pdma.h |  6 ++++++
 2 files changed, 30 insertions(+), 3 deletions(-)

Comments

Conor Dooley Sept. 22, 2023, 10:03 a.m. UTC | #1 
Hey Shravan,

On Fri, Sep 22, 2023 at 03:20:39PM +0530, shravan chippa wrote:
> From: Shravan Chippa <shravan.chippa@microchip.com>
> 
> Sifive platform dma does not allow out-of-order transfers,

Can you remind me why we determined that this was the case?
IOW, why could we not enable the out-of-order transfers and get a
performance benefit for everyone? It's been a year or so (I think) and I
have forgotten.

Cheers,
Conor.

> buf out-of-order dma has a significant performance advantage.
> Add a PolarFire SoC specific compatible and code to support
> for out-of-order dma transfers
> 
> Signed-off-by: Shravan Chippa <shravan.chippa@microchip.com>
> Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> ---
>  drivers/dma/sf-pdma/sf-pdma.c | 27 ++++++++++++++++++++++++---
>  drivers/dma/sf-pdma/sf-pdma.h |  6 ++++++
>  2 files changed, 30 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/dma/sf-pdma/sf-pdma.c b/drivers/dma/sf-pdma/sf-pdma.c
> index c7558c9f9ac3..992a804166d5 100644
> --- a/drivers/dma/sf-pdma/sf-pdma.c
> +++ b/drivers/dma/sf-pdma/sf-pdma.c
> @@ -21,6 +21,7 @@
>  #include <linux/dma-mapping.h>
>  #include <linux/of.h>
>  #include <linux/of_dma.h>
> +#include <linux/of_device.h>
>  #include <linux/slab.h>
>  
>  #include "sf-pdma.h"
> @@ -66,7 +67,7 @@ static struct sf_pdma_desc *sf_pdma_alloc_desc(struct sf_pdma_chan *chan)
>  static void sf_pdma_fill_desc(struct sf_pdma_desc *desc,
>  			      u64 dst, u64 src, u64 size)
>  {
> -	desc->xfer_type = PDMA_FULL_SPEED;
> +	desc->xfer_type =  desc->chan->pdma->transfer_type;
>  	desc->xfer_size = size;
>  	desc->dst_addr = dst;
>  	desc->src_addr = src;
> @@ -520,6 +521,7 @@ static struct dma_chan *sf_pdma_of_xlate(struct of_phandle_args *dma_spec,
>  
>  static int sf_pdma_probe(struct platform_device *pdev)
>  {
> +	const struct sf_pdma_driver_platdata *ddata;
>  	struct sf_pdma *pdma;
>  	int ret, n_chans;
>  	const enum dma_slave_buswidth widths =
> @@ -545,6 +547,14 @@ static int sf_pdma_probe(struct platform_device *pdev)
>  
>  	pdma->n_chans = n_chans;
>  
> +	pdma->transfer_type = PDMA_FULL_SPEED;
> +
> +	ddata  = of_device_get_match_data(&pdev->dev);
> +	if (ddata) {
> +		if (ddata->quirks & NO_STRICT_ORDERING)
> +			pdma->transfer_type &= ~(NO_STRICT_ORDERING);
> +	}
> +
>  	pdma->membase = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(pdma->membase))
>  		return PTR_ERR(pdma->membase);
> @@ -629,11 +639,22 @@ static int sf_pdma_remove(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static const struct sf_pdma_driver_platdata mpfs_pdma = {
> +	.quirks = NO_STRICT_ORDERING,
> +};
> +
>  static const struct of_device_id sf_pdma_dt_ids[] = {
> -	{ .compatible = "sifive,fu540-c000-pdma" },
> -	{ .compatible = "sifive,pdma0" },
> +	{
> +		.compatible = "sifive,fu540-c000-pdma",
> +	}, {
> +		.compatible = "sifive,pdma0",
> +	}, {
> +		.compatible = "microchip,mpfs-pdma",
> +		.data	    = &mpfs_pdma,
> +	},
>  	{},
>  };
> +
>  MODULE_DEVICE_TABLE(of, sf_pdma_dt_ids);
>  
>  static struct platform_driver sf_pdma_driver = {
> diff --git a/drivers/dma/sf-pdma/sf-pdma.h b/drivers/dma/sf-pdma/sf-pdma.h
> index 5c398a83b491..3b16db4daa0b 100644
> --- a/drivers/dma/sf-pdma/sf-pdma.h
> +++ b/drivers/dma/sf-pdma/sf-pdma.h
> @@ -49,6 +49,7 @@
>  
>  /* Transfer Type */
>  #define PDMA_FULL_SPEED					0xFF000008
> +#define NO_STRICT_ORDERING				BIT(3)
>  
>  /* Error Recovery */
>  #define MAX_RETRY					1
> @@ -112,8 +113,13 @@ struct sf_pdma {
>  	struct dma_device       dma_dev;
>  	void __iomem            *membase;
>  	void __iomem            *mappedbase;
> +	u32			transfer_type;
>  	u32			n_chans;
>  	struct sf_pdma_chan	chans[];
>  };
>  
> +struct sf_pdma_driver_platdata {
> +	u32 quirks;
> +};
> +
>  #endif /* _SF_PDMA_H */
> -- 
> 2.34.1
>
shravan chippa Sept. 25, 2023, 5:22 a.m. UTC | #2 
> -----Original Message-----
> From: Conor Dooley <conor@kernel.org>
> Sent: Friday, September 22, 2023 3:34 PM
> To: shravan Chippa - I35088 <Shravan.Chippa@microchip.com>
> Cc: green.wan@sifive.com; vkoul@kernel.org; robh+dt@kernel.org;
> krzysztof.kozlowski+dt@linaro.org; palmer@dabbelt.com;
> paul.walmsley@sifive.com; conor+dt@kernel.org; palmer@sifive.com;
> dmaengine@vger.kernel.org; devicetree@vger.kernel.org; linux-
> riscv@lists.infradead.org; linux-kernel@vger.kernel.org; Nagasuresh Relli -
> I67208 <Nagasuresh.Relli@microchip.com>; Praveen Kumar - I30718
> <Praveen.Kumar@microchip.com>; Conor Dooley - M52691
> <Conor.Dooley@microchip.com>
> Subject: Re: [PATCH v1 3/3] dmaengine: sf-pdma: add mpfs-pdma compatible
> name
> 
> Hey Shravan,
> 
> On Fri, Sep 22, 2023 at 03:20:39PM +0530, shravan chippa wrote:
> > From: Shravan Chippa <shravan.chippa@microchip.com>
> >
> > Sifive platform dma does not allow out-of-order transfers,
> 
> Can you remind me why we determined that this was the case?
> IOW, why could we not enable the out-of-order transfers and get a
> performance benefit for everyone? It's been a year or so (I think) and I have
> forgotten.
> 

I will try to modify the commit message.

Thanks,
Shravan

> Cheers,
> Conor.
> 
> > buf out-of-order dma has a significant performance advantage.
> > Add a PolarFire SoC specific compatible and code to support for
> > out-of-order dma transfers
> >
> > Signed-off-by: Shravan Chippa <shravan.chippa@microchip.com>
> > Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> > Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> > ---
> >  drivers/dma/sf-pdma/sf-pdma.c | 27 ++++++++++++++++++++++++---
> > drivers/dma/sf-pdma/sf-pdma.h |  6 ++++++
> >  2 files changed, 30 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/dma/sf-pdma/sf-pdma.c
> > b/drivers/dma/sf-pdma/sf-pdma.c index c7558c9f9ac3..992a804166d5
> > 100644
> > --- a/drivers/dma/sf-pdma/sf-pdma.c
> > +++ b/drivers/dma/sf-pdma/sf-pdma.c
> > @@ -21,6 +21,7 @@
> >  #include <linux/dma-mapping.h>
> >  #include <linux/of.h>
> >  #include <linux/of_dma.h>
> > +#include <linux/of_device.h>
> >  #include <linux/slab.h>
> >
> >  #include "sf-pdma.h"
> > @@ -66,7 +67,7 @@ static struct sf_pdma_desc
> > *sf_pdma_alloc_desc(struct sf_pdma_chan *chan)  static void
> sf_pdma_fill_desc(struct sf_pdma_desc *desc,
> >  			      u64 dst, u64 src, u64 size)
> >  {
> > -	desc->xfer_type = PDMA_FULL_SPEED;
> > +	desc->xfer_type =  desc->chan->pdma->transfer_type;
> >  	desc->xfer_size = size;
> >  	desc->dst_addr = dst;
> >  	desc->src_addr = src;
> > @@ -520,6 +521,7 @@ static struct dma_chan *sf_pdma_of_xlate(struct
> > of_phandle_args *dma_spec,
> >
> >  static int sf_pdma_probe(struct platform_device *pdev)  {
> > +	const struct sf_pdma_driver_platdata *ddata;
> >  	struct sf_pdma *pdma;
> >  	int ret, n_chans;
> >  	const enum dma_slave_buswidth widths = @@ -545,6 +547,14 @@
> static
> > int sf_pdma_probe(struct platform_device *pdev)
> >
> >  	pdma->n_chans = n_chans;
> >
> > +	pdma->transfer_type = PDMA_FULL_SPEED;
> > +
> > +	ddata  = of_device_get_match_data(&pdev->dev);
> > +	if (ddata) {
> > +		if (ddata->quirks & NO_STRICT_ORDERING)
> > +			pdma->transfer_type &= ~(NO_STRICT_ORDERING);
> > +	}
> > +
> >  	pdma->membase = devm_platform_ioremap_resource(pdev, 0);
> >  	if (IS_ERR(pdma->membase))
> >  		return PTR_ERR(pdma->membase);
> > @@ -629,11 +639,22 @@ static int sf_pdma_remove(struct
> platform_device *pdev)
> >  	return 0;
> >  }
> >
> > +static const struct sf_pdma_driver_platdata mpfs_pdma = {
> > +	.quirks = NO_STRICT_ORDERING,
> > +};
> > +
> >  static const struct of_device_id sf_pdma_dt_ids[] = {
> > -	{ .compatible = "sifive,fu540-c000-pdma" },
> > -	{ .compatible = "sifive,pdma0" },
> > +	{
> > +		.compatible = "sifive,fu540-c000-pdma",
> > +	}, {
> > +		.compatible = "sifive,pdma0",
> > +	}, {
> > +		.compatible = "microchip,mpfs-pdma",
> > +		.data	    = &mpfs_pdma,
> > +	},
> >  	{},
> >  };
> > +
> >  MODULE_DEVICE_TABLE(of, sf_pdma_dt_ids);
> >
> >  static struct platform_driver sf_pdma_driver = { diff --git
> > a/drivers/dma/sf-pdma/sf-pdma.h b/drivers/dma/sf-pdma/sf-pdma.h
> index
> > 5c398a83b491..3b16db4daa0b 100644
> > --- a/drivers/dma/sf-pdma/sf-pdma.h
> > +++ b/drivers/dma/sf-pdma/sf-pdma.h
> > @@ -49,6 +49,7 @@
> >
> >  /* Transfer Type */
> >  #define PDMA_FULL_SPEED					0xFF000008
> > +#define NO_STRICT_ORDERING				BIT(3)
> >
> >  /* Error Recovery */
> >  #define MAX_RETRY					1
> > @@ -112,8 +113,13 @@ struct sf_pdma {
> >  	struct dma_device       dma_dev;
> >  	void __iomem            *membase;
> >  	void __iomem            *mappedbase;
> > +	u32			transfer_type;
> >  	u32			n_chans;
> >  	struct sf_pdma_chan	chans[];
> >  };
> >
> > +struct sf_pdma_driver_platdata {
> > +	u32 quirks;
> > +};
> > +
> >  #endif /* _SF_PDMA_H */
> > --
> > 2.34.1
> >
shravan chippa Sept. 26, 2023, 7:04 a.m. UTC | #3 
Hi,

> -----Original Message-----
> From: Conor Dooley <conor@kernel.org>
> Sent: Friday, September 22, 2023 3:34 PM
> To: shravan Chippa - I35088 <Shravan.Chippa@microchip.com>
> Cc: green.wan@sifive.com; vkoul@kernel.org; robh+dt@kernel.org;
> krzysztof.kozlowski+dt@linaro.org; palmer@dabbelt.com;
> paul.walmsley@sifive.com; conor+dt@kernel.org; palmer@sifive.com;
> dmaengine@vger.kernel.org; devicetree@vger.kernel.org; linux-
> riscv@lists.infradead.org; linux-kernel@vger.kernel.org; Nagasuresh Relli -
> I67208 <Nagasuresh.Relli@microchip.com>; Praveen Kumar - I30718
> <Praveen.Kumar@microchip.com>; Conor Dooley - M52691
> <Conor.Dooley@microchip.com>
> Subject: Re: [PATCH v1 3/3] dmaengine: sf-pdma: add mpfs-pdma compatible
> name
> 
> Hey Shravan,
> 
> On Fri, Sep 22, 2023 at 03:20:39PM +0530, shravan chippa wrote:
> > From: Shravan Chippa <shravan.chippa@microchip.com>
> >
> > Sifive platform dma does not allow out-of-order transfers,
> 
> Can you remind me why we determined that this was the case?
> IOW, why could we not enable the out-of-order transfers and get a
> performance benefit for everyone? It's been a year or so (I think) and I have
> forgotten.

sf-dma is used for all Sifive RISC-V chipsets, but we will not be able to test on all of them
in the microchip polar-fire FPGA SOC (RISC-V) platform we got good throughput with out-off-order transfers.
so we thought of having a separate compatible name for sf-dma driver to use out-of-order transfers. 

Thanks,
Shravan

> 
> Cheers,
> Conor.
> 
> > buf out-of-order dma has a significant performance advantage.
> > Add a PolarFire SoC specific compatible and code to support for
> > out-of-order dma transfers
> >
> > Signed-off-by: Shravan Chippa <shravan.chippa@microchip.com>
> > Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
> > Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
> > ---
> >  drivers/dma/sf-pdma/sf-pdma.c | 27 ++++++++++++++++++++++++---
> > drivers/dma/sf-pdma/sf-pdma.h |  6 ++++++
> >  2 files changed, 30 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/dma/sf-pdma/sf-pdma.c
> > b/drivers/dma/sf-pdma/sf-pdma.c index c7558c9f9ac3..992a804166d5
> > 100644
> > --- a/drivers/dma/sf-pdma/sf-pdma.c
> > +++ b/drivers/dma/sf-pdma/sf-pdma.c
> > @@ -21,6 +21,7 @@
> >  #include <linux/dma-mapping.h>
> >  #include <linux/of.h>
> >  #include <linux/of_dma.h>
> > +#include <linux/of_device.h>
> >  #include <linux/slab.h>
> >
> >  #include "sf-pdma.h"
> > @@ -66,7 +67,7 @@ static struct sf_pdma_desc
> > *sf_pdma_alloc_desc(struct sf_pdma_chan *chan)  static void
> sf_pdma_fill_desc(struct sf_pdma_desc *desc,
> >  			      u64 dst, u64 src, u64 size)
> >  {
> > -	desc->xfer_type = PDMA_FULL_SPEED;
> > +	desc->xfer_type =  desc->chan->pdma->transfer_type;
> >  	desc->xfer_size = size;
> >  	desc->dst_addr = dst;
> >  	desc->src_addr = src;
> > @@ -520,6 +521,7 @@ static struct dma_chan *sf_pdma_of_xlate(struct
> > of_phandle_args *dma_spec,
> >
> >  static int sf_pdma_probe(struct platform_device *pdev)  {
> > +	const struct sf_pdma_driver_platdata *ddata;
> >  	struct sf_pdma *pdma;
> >  	int ret, n_chans;
> >  	const enum dma_slave_buswidth widths = @@ -545,6 +547,14 @@
> static
> > int sf_pdma_probe(struct platform_device *pdev)
> >
> >  	pdma->n_chans = n_chans;
> >
> > +	pdma->transfer_type = PDMA_FULL_SPEED;
> > +
> > +	ddata  = of_device_get_match_data(&pdev->dev);
> > +	if (ddata) {
> > +		if (ddata->quirks & NO_STRICT_ORDERING)
> > +			pdma->transfer_type &= ~(NO_STRICT_ORDERING);
> > +	}
> > +
> >  	pdma->membase = devm_platform_ioremap_resource(pdev, 0);
> >  	if (IS_ERR(pdma->membase))
> >  		return PTR_ERR(pdma->membase);
> > @@ -629,11 +639,22 @@ static int sf_pdma_remove(struct
> platform_device *pdev)
> >  	return 0;
> >  }
> >
> > +static const struct sf_pdma_driver_platdata mpfs_pdma = {
> > +	.quirks = NO_STRICT_ORDERING,
> > +};
> > +
> >  static const struct of_device_id sf_pdma_dt_ids[] = {
> > -	{ .compatible = "sifive,fu540-c000-pdma" },
> > -	{ .compatible = "sifive,pdma0" },
> > +	{
> > +		.compatible = "sifive,fu540-c000-pdma",
> > +	}, {
> > +		.compatible = "sifive,pdma0",
> > +	}, {
> > +		.compatible = "microchip,mpfs-pdma",
> > +		.data	    = &mpfs_pdma,
> > +	},
> >  	{},
> >  };
> > +
> >  MODULE_DEVICE_TABLE(of, sf_pdma_dt_ids);
> >
> >  static struct platform_driver sf_pdma_driver = { diff --git
> > a/drivers/dma/sf-pdma/sf-pdma.h b/drivers/dma/sf-pdma/sf-pdma.h
> index
> > 5c398a83b491..3b16db4daa0b 100644
> > --- a/drivers/dma/sf-pdma/sf-pdma.h
> > +++ b/drivers/dma/sf-pdma/sf-pdma.h
> > @@ -49,6 +49,7 @@
> >
> >  /* Transfer Type */
> >  #define PDMA_FULL_SPEED					0xFF000008
> > +#define NO_STRICT_ORDERING				BIT(3)
> >
> >  /* Error Recovery */
> >  #define MAX_RETRY					1
> > @@ -112,8 +113,13 @@ struct sf_pdma {
> >  	struct dma_device       dma_dev;
> >  	void __iomem            *membase;
> >  	void __iomem            *mappedbase;
> > +	u32			transfer_type;
> >  	u32			n_chans;
> >  	struct sf_pdma_chan	chans[];
> >  };
> >
> > +struct sf_pdma_driver_platdata {
> > +	u32 quirks;
> > +};
> > +
> >  #endif /* _SF_PDMA_H */
> > --
> > 2.34.1
> >
diff mbox series

Patch

diff --git a/drivers/dma/sf-pdma/sf-pdma.c b/drivers/dma/sf-pdma/sf-pdma.c
index c7558c9f9ac3..992a804166d5 100644
--- a/drivers/dma/sf-pdma/sf-pdma.c
+++ b/drivers/dma/sf-pdma/sf-pdma.c
@@ -21,6 +21,7 @@ 
 #include <linux/dma-mapping.h>
 #include <linux/of.h>
 #include <linux/of_dma.h>
+#include <linux/of_device.h>
 #include <linux/slab.h>
 
 #include "sf-pdma.h"
@@ -66,7 +67,7 @@  static struct sf_pdma_desc *sf_pdma_alloc_desc(struct sf_pdma_chan *chan)
 static void sf_pdma_fill_desc(struct sf_pdma_desc *desc,
 			      u64 dst, u64 src, u64 size)
 {
-	desc->xfer_type = PDMA_FULL_SPEED;
+	desc->xfer_type =  desc->chan->pdma->transfer_type;
 	desc->xfer_size = size;
 	desc->dst_addr = dst;
 	desc->src_addr = src;
@@ -520,6 +521,7 @@  static struct dma_chan *sf_pdma_of_xlate(struct of_phandle_args *dma_spec,
 
 static int sf_pdma_probe(struct platform_device *pdev)
 {
+	const struct sf_pdma_driver_platdata *ddata;
 	struct sf_pdma *pdma;
 	int ret, n_chans;
 	const enum dma_slave_buswidth widths =
@@ -545,6 +547,14 @@  static int sf_pdma_probe(struct platform_device *pdev)
 
 	pdma->n_chans = n_chans;
 
+	pdma->transfer_type = PDMA_FULL_SPEED;
+
+	ddata  = of_device_get_match_data(&pdev->dev);
+	if (ddata) {
+		if (ddata->quirks & NO_STRICT_ORDERING)
+			pdma->transfer_type &= ~(NO_STRICT_ORDERING);
+	}
+
 	pdma->membase = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(pdma->membase))
 		return PTR_ERR(pdma->membase);
@@ -629,11 +639,22 @@  static int sf_pdma_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct sf_pdma_driver_platdata mpfs_pdma = {
+	.quirks = NO_STRICT_ORDERING,
+};
+
 static const struct of_device_id sf_pdma_dt_ids[] = {
-	{ .compatible = "sifive,fu540-c000-pdma" },
-	{ .compatible = "sifive,pdma0" },
+	{
+		.compatible = "sifive,fu540-c000-pdma",
+	}, {
+		.compatible = "sifive,pdma0",
+	}, {
+		.compatible = "microchip,mpfs-pdma",
+		.data	    = &mpfs_pdma,
+	},
 	{},
 };
+
 MODULE_DEVICE_TABLE(of, sf_pdma_dt_ids);
 
 static struct platform_driver sf_pdma_driver = {
diff --git a/drivers/dma/sf-pdma/sf-pdma.h b/drivers/dma/sf-pdma/sf-pdma.h
index 5c398a83b491..3b16db4daa0b 100644
--- a/drivers/dma/sf-pdma/sf-pdma.h
+++ b/drivers/dma/sf-pdma/sf-pdma.h
@@ -49,6 +49,7 @@ 
 
 /* Transfer Type */
 #define PDMA_FULL_SPEED					0xFF000008
+#define NO_STRICT_ORDERING				BIT(3)
 
 /* Error Recovery */
 #define MAX_RETRY					1
@@ -112,8 +113,13 @@  struct sf_pdma {
 	struct dma_device       dma_dev;
 	void __iomem            *membase;
 	void __iomem            *mappedbase;
+	u32			transfer_type;
 	u32			n_chans;
 	struct sf_pdma_chan	chans[];
 };
 
+struct sf_pdma_driver_platdata {
+	u32 quirks;
+};
+
 #endif /* _SF_PDMA_H */