linux-kernel - Re: [PATCH v4 3/4] dmaengine: Add Broadcom SBA RAID driver

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Message-ID: <CAPcyv4g5PU1EQWq-SCbt0QB=vSaMyafqa-ThJifDxEoQha-6Hw@mail.gmail.com>
Date:   Tue, 14 Feb 2017 08:34:49 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Anup Patel <anup.patel@...adcom.com>
Cc:     Vinod Koul <vinod.koul@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Jon Mason <jonmason@...adcom.com>,
        Rob Rice <rob.rice@...adcom.com>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        Device Tree <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-crypto@...r.kernel.org,
        linux-raid <linux-raid@...r.kernel.org>
Subject: Re: [PATCH v4 3/4] dmaengine: Add Broadcom SBA RAID driver

On Mon, Feb 13, 2017 at 10:51 PM, Anup Patel <anup.patel@...adcom.com> wrote:
> The Broadcom stream buffer accelerator (SBA) provides offloading
> capabilities for RAID operations. This SBA offload engine is
> accessible via Broadcom SoC specific ring manager.
>
> This patch adds Broadcom SBA RAID driver which provides one
> DMA device with RAID capabilities using one or more Broadcom
> SoC specific ring manager channels. The SBA RAID driver in its
> current shape implements memcpy, xor, and pq operations.
>
> Signed-off-by: Anup Patel <anup.patel@...adcom.com>
> Reviewed-by: Ray Jui <ray.jui@...adcom.com>
> ---
>  drivers/dma/Kconfig        |   13 +
>  drivers/dma/Makefile       |    1 +
>  drivers/dma/bcm-sba-raid.c | 1694 ++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 1708 insertions(+)
>  create mode 100644 drivers/dma/bcm-sba-raid.c
>
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index 263495d..bf8fb84 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -99,6 +99,19 @@ config AXI_DMAC
>           controller is often used in Analog Device's reference designs for FPGA
>           platforms.
>
> +config BCM_SBA_RAID
> +       tristate "Broadcom SBA RAID engine support"
> +       depends on (ARM64 && MAILBOX && RAID6_PQ) || COMPILE_TEST
> +       select DMA_ENGINE
> +       select DMA_ENGINE_RAID
> +       select ASYNC_TX_ENABLE_CHANNEL_SWITCH

I thought you agreed to drop this. Its usage is broken.