linux-kernel - Re: [PATCH v2 2/7] drivers/soc: Add Aspeed XDMA Engine Driver

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Date:   Tue, 21 May 2019 14:02:22 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-aspeed@...ts.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        DTML <devicetree@...r.kernel.org>, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>
Subject: Re: [PATCH v2 2/7] drivers/soc: Add Aspeed XDMA Engine Driver

On Mon, May 20, 2019 at 10:19 PM Eddie James <eajames@...ux.ibm.com> wrote:
> diff --git a/include/uapi/linux/aspeed-xdma.h b/include/uapi/linux/aspeed-xdma.h
> new file mode 100644
> index 0000000..2a4bd13
> --- /dev/null
> +++ b/include/uapi/linux/aspeed-xdma.h
> @@ -0,0 +1,26 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/* Copyright IBM Corp 2019 */
> +
> +#ifndef _UAPI_LINUX_ASPEED_XDMA_H_
> +#define _UAPI_LINUX_ASPEED_XDMA_H_
> +
> +#include <linux/types.h>
> +
> +/*
> + * aspeed_xdma_op
> + *
> + * upstream: boolean indicating the direction of the DMA operation; upstream
> + *           means a transfer from the BMC to the host
> + *
> + * host_addr: the DMA address on the host side, typically configured by PCI
> + *            subsystem
> + *
> + * len: the size of the transfer in bytes; it should be a multiple of 16 bytes
> + */
> +struct aspeed_xdma_op {
> +       __u32 upstream;
> +       __u64 host_addr;
> +       __u32 len;
> +};
> +
> +#endif /* _UAPI_LINUX_ASPEED_XDMA_H_ */

If this is a user space interface, please remove the holes in the
data structure.

I don't see how this is actually used in this patch, maybe you meant
the definition to be part of another patch?

    Arnd