linux-kernel - Re: [PATCH 06/10] ioatdma: Removing PQ val disable for cb3.3

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Date:	Wed, 27 Mar 2013 11:48:50 -0700
From:	Dan Williams <djbw@...com>
To:	Dave Jiang <dave.jiang@...el.com>
Cc:	vinod.koul@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/10] ioatdma: Removing PQ val disable for cb3.3

On Tue, Mar 26, 2013 at 3:43 PM, Dave Jiang <dave.jiang@...el.com> wrote:
> The PQ Val ops work on the newer hardware so we should actually provide support
> for it and remove the disabling bits.
>
> Signed-off-by: Dave Jiang <dave.jiang@...el.com>
> ---
>  drivers/dma/Kconfig          |    2 -
>  drivers/dma/ioat/dma.h       |    1
>  drivers/dma/ioat/dma_v3.c    |  134 ++++++++++++++++++++++++++++++++++++++----
>  drivers/dma/ioat/registers.h |    2 +
>  4 files changed, 125 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index 80b6997..dec088d 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -63,8 +63,6 @@ config INTEL_IOATDMA
>         depends on PCI && X86
>         select DMA_ENGINE
>         select DCA
> -       select ASYNC_TX_DISABLE_PQ_VAL_DMA
> -       select ASYNC_TX_DISABLE_XOR_VAL_DMA
>         help
>           Enable support for the Intel(R) I/OAT DMA engine present
>           in recent Intel Xeon chipsets.
[..]
> @@ -1469,15 +1581,13 @@ int ioat3_dma_probe(struct ioatdma_device *device, int dca)
>         device->cleanup_fn = ioat3_cleanup_event;
>         device->timer_fn = ioat3_timer_event;
>
> -       #ifdef CONFIG_ASYNC_TX_DISABLE_PQ_VAL_DMA
> -       dma_cap_clear(DMA_PQ_VAL, dma->cap_mask);
> -       dma->device_prep_dma_pq_val = NULL;
> -       #endif
> +       if (is_xeon_cb32(pdev)) {
> +               dma_cap_clear(DMA_XOR_VAL, dma->cap_mask);
> +               dma->device_prep_dma_xor_val = NULL;
>
> -       #ifdef CONFIG_ASYNC_TX_DISABLE_XOR_VAL_DMA
> -       dma_cap_clear(DMA_XOR_VAL, dma->cap_mask);
> -       dma->device_prep_dma_xor_val = NULL;
> -       #endif
> +               dma_cap_clear(DMA_PQ_VAL, dma->cap_mask);
> +               dma->device_prep_dma_pq_val = NULL;
> +       }

Note that this effectively disables raid offload for is_xeon_cb32()
platforms since DMA_ASYNC_TX will not be set.
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