linux-kernel - Re: [PATCH 8/9] ide: switch to DMA-mapping API

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Date:	Wed, 2 Jan 2008 16:34:38 +0800
From:	"Bryan Wu" <cooloney.lkml@...il.com>
To:	"Bartlomiej Zolnierkiewicz" <bzolnier@...il.com>,
	uclinux-dist-devel@...ckfin.uclinux.org
Cc:	linux-ide@...r.kernel.org, "Bryan Wu" <bryan.wu@...log.com>,
	linux-kernel@...r.kernel.org, "Russell King" <rmk@....linux.org.uk>
Subject: Re: [PATCH 8/9] ide: switch to DMA-mapping API

On Dec 28, 2007 3:12 AM, Bartlomiej Zolnierkiewicz <bzolnier@...il.com> wrote:
> * pci_map_sg() -> dma_map_sg() in ide_build_sglist().
>
> * pci_unmap_sg() -> dma_unmap_sg() in ide_destroy_dmatable().
>
> There should be no functionality changes caused by this patch except
> for blackfin arch whose dma_[un]map_sg() implementation differs from
> pci_[un]map_sg() one (on s390 arch there is no PCI, on avr32 and h8300
> archs PCI is currently unsupported, on m32r arch PCI support depends
> on BROKEN, on m68k arch PCI support depends on HADES which in turn
> depends on BROKEN, on all other archs dma_[un]map_sg() functionality
> matches with pci_[un]map_sg() one).
>

Thanks a lot for this carefully check with Blackfin.
Please go ahead with this patch change, we plan to remove PCI useless
header file in Blackfin like AVR32

-Bryan

> Cc: Bryan Wu <bryan.wu@...log.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> ---
> It seems like blackfin arch should be using <asm-generic/pci-dma-compat.h>
> in <asm-blackfin/pci.h> or drivers still using PCI DMA-mapping API instead
> of the generic one won't work but I'll leave this to blackfin gurus...
>
> [ Bryan, could you please take a look?  Thanks. ]
>
>  drivers/ide/ide-dma.c |   18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)
>
> Index: b/drivers/ide/ide-dma.c
> ===================================================================
> --- a/drivers/ide/ide-dma.c
> +++ b/drivers/ide/ide-dma.c
> @@ -85,6 +85,7 @@
>  #include <linux/ide.h>
>  #include <linux/delay.h>
>  #include <linux/scatterlist.h>
> +#include <linux/dma-mapping.h>
>
>  #include <asm/io.h>
>  #include <asm/irq.h>
> @@ -175,26 +176,26 @@ static int ide_dma_good_drive(ide_drive_
>   *     @drive: the drive to build the DMA table for
>   *     @rq: the request holding the sg list
>   *
> - *     Perform the PCI mapping magic necessary to access the source or
> - *     target buffers of a request via PCI DMA. The lower layers of the
> + *     Perform the DMA mapping magic necessary to access the source or
> + *     target buffers of a request via DMA.  The lower layers of the
>   *     kernel provide the necessary cache management so that we can
> - *     operate in a portable fashion
> + *     operate in a portable fashion.
>   */
>
>  int ide_build_sglist(ide_drive_t *drive, struct request *rq)
>  {
>         ide_hwif_t *hwif = HWIF(drive);
> -       struct pci_dev *pdev = to_pci_dev(hwif->dev);
>         struct scatterlist *sg = hwif->sg_table;
>
>         ide_map_sg(drive, rq);
>
>         if (rq_data_dir(rq) == READ)
> -               hwif->sg_dma_direction = PCI_DMA_FROMDEVICE;
> +               hwif->sg_dma_direction = DMA_FROM_DEVICE;
>         else
> -               hwif->sg_dma_direction = PCI_DMA_TODEVICE;
> +               hwif->sg_dma_direction = DMA_TO_DEVICE;
>
> -       return pci_map_sg(pdev, sg, hwif->sg_nents, hwif->sg_dma_direction);
> +       return dma_map_sg(hwif->dev, sg, hwif->sg_nents,
> +                         hwif->sg_dma_direction);
>  }
>
>  EXPORT_SYMBOL_GPL(ide_build_sglist);
> @@ -308,9 +309,8 @@ EXPORT_SYMBOL_GPL(ide_build_dmatable);
>  void ide_destroy_dmatable (ide_drive_t *drive)
>  {
>         ide_hwif_t *hwif = drive->hwif;
> -       struct pci_dev *pdev = to_pci_dev(hwif->dev);
>
> -       pci_unmap_sg(pdev, hwif->sg_table, hwif->sg_nents,
> +       dma_unmap_sg(hwif->dev, hwif->sg_table, hwif->sg_nents,
>                      hwif->sg_dma_direction);
>  }
>
> --
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