Hi Vinod, > -----Original Message----- > From: Vinod Koul <vkoul@xxxxxxxxxx> > Sent: Friday, November 24, 2023 5:42 PM > To: shravan Chippa - I35088 <Shravan.Chippa@xxxxxxxxxxxxx> > Cc: green.wan@xxxxxxxxxx; robh+dt@xxxxxxxxxx; > krzysztof.kozlowski+dt@xxxxxxxxxx; palmer@xxxxxxxxxxx; > paul.walmsley@xxxxxxxxxx; conor+dt@xxxxxxxxxx; > dmaengine@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux- > riscv@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Nagasuresh Relli - > I67208 <Nagasuresh.Relli@xxxxxxxxxxxxx>; Praveen Kumar - I30718 > <Praveen.Kumar@xxxxxxxxxxxxx>; Emil Renner Berthing > <emil.renner.berthing@xxxxxxxxxxxxx> > Subject: Re: [PATCH v4 3/4] dmaengine: sf-pdma: add mpfs-pdma compatible > name > > [Some people who received this message don't often get email from > vkoul@xxxxxxxxxx. Learn why this is important at > https://aka.ms/LearnAboutSenderIdentification ] > > EXTERNAL EMAIL: Do not click links or open attachments unless you know the > content is safe > > On 31-10-23, 10:57, shravan chippa wrote: > > From: Shravan Chippa <shravan.chippa@xxxxxxxxxxxxx> > > > > Sifive platform dma does not allow out-of-order transfers, Add a > > PolarFire SoC specific compatible and code to support for out-of-order > > dma transfers > > By default dma xtions are not supposed to be out of order, so why does it > make sense specifying that here? All the DMA transfers are mostly in-order; however, sf-pdma IP has programable configuration: we can select the transfer type either in-order or out-of-order. Sf-pdam IP will only support mem-to-mem transfers. We got better throughput in the PolarFire SoC platform if we use out-of-order DMA transfers type, instead of in-order configuration in the sf-pdma IP. test results for in-order: - moved 16 MB from 0x89000000 using pdmacpy to 0x88000000 (chan: 0) in 0.068962 secs (232.012 MB per sec) test results for out-of-order: - moved 16 MB from 0x89000000 using pdmacpy to 0x88000000 (chan: 0) in 0.037020 secs (432.199 MB per sec) Thanks, Shravan > > > > > Reviewed-by: Emil Renner Berthing <emil.renner.berthing@xxxxxxxxxxxxx> > > Signed-off-by: Shravan Chippa <shravan.chippa@xxxxxxxxxxxxx> > > --- > > drivers/dma/sf-pdma/sf-pdma.c | 27 ++++++++++++++++++++++++--- > > drivers/dma/sf-pdma/sf-pdma.h | 8 +++++++- > > 2 files changed, 31 insertions(+), 4 deletions(-) > > > > diff --git a/drivers/dma/sf-pdma/sf-pdma.c > > b/drivers/dma/sf-pdma/sf-pdma.c index 4c456bdef882..82ab12c40743 > > 100644 > > --- a/drivers/dma/sf-pdma/sf-pdma.c > > +++ b/drivers/dma/sf-pdma/sf-pdma.c > > @@ -25,6 +25,8 @@ > > > > #include "sf-pdma.h" > > > > +#define PDMA_QUIRK_NO_STRICT_ORDERING BIT(0) > > + > > #ifndef readq > > static inline unsigned long long readq(void __iomem *addr) { @@ > > -66,7 +68,7 @@ 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 +522,7 @@ 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 +548,14 @@ > > static int sf_pdma_probe(struct platform_device *pdev) > > > > pdma->n_chans = n_chans; > > > > + pdma->transfer_type = PDMA_FULL_SPEED | PDMA_STRICT_ORDERING; > > + > > + ddata = device_get_match_data(&pdev->dev); > > + if (ddata) { > > + if (ddata->quirks & PDMA_QUIRK_NO_STRICT_ORDERING) > > + pdma->transfer_type &= ~PDMA_STRICT_ORDERING; > > + } > > + > > pdma->membase = devm_platform_ioremap_resource(pdev, 0); > > if (IS_ERR(pdma->membase)) > > return PTR_ERR(pdma->membase); @@ -632,9 +643,19 @@ > > static int sf_pdma_remove(struct platform_device *pdev) > > return 0; > > } > > > > +static const struct sf_pdma_driver_platdata mpfs_pdma = { > > + .quirks = PDMA_QUIRK_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); diff --git > > a/drivers/dma/sf-pdma/sf-pdma.h b/drivers/dma/sf-pdma/sf-pdma.h > index > > 5c398a83b491..267e79a5e0a5 100644 > > --- a/drivers/dma/sf-pdma/sf-pdma.h > > +++ b/drivers/dma/sf-pdma/sf-pdma.h > > @@ -48,7 +48,8 @@ > > #define PDMA_ERR_STATUS_MASK GENMASK(31, 31) > > > > /* Transfer Type */ > > -#define PDMA_FULL_SPEED 0xFF000008 > > +#define PDMA_FULL_SPEED 0xFF000000 > > +#define PDMA_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 > > -- > ~Vinod
