linux-kernel - Re: [PATCH v3 1/3] bcm-vk: add bcm

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Date:   Mon, 7 Sep 2020 14:35:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Scott Branden <scott.branden@...adcom.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Kees Cook <keescook@...omium.org>,
        linux-kernel@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH v3 1/3] bcm-vk: add bcm_vk UAPI

On Tue, Aug 25, 2020 at 12:43:58PM -0700, Scott Branden wrote:
> Add user space api for bcm-vk driver.
> 
> Signed-off-by: Scott Branden <scott.branden@...adcom.com>
> ---
>  include/uapi/linux/misc/bcm_vk.h | 99 ++++++++++++++++++++++++++++++++
>  1 file changed, 99 insertions(+)
>  create mode 100644 include/uapi/linux/misc/bcm_vk.h
> 
> diff --git a/include/uapi/linux/misc/bcm_vk.h b/include/uapi/linux/misc/bcm_vk.h
> new file mode 100644
> index 000000000000..da7848e7c438
> --- /dev/null
> +++ b/include/uapi/linux/misc/bcm_vk.h
> @@ -0,0 +1,99 @@
> +/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) */
> +/*
> + * Copyright 2018-2020 Broadcom.
> + */
> +
> +#ifndef __UAPI_LINUX_MISC_BCM_VK_H
> +#define __UAPI_LINUX_MISC_BCM_VK_H
> +
> +#include <linux/ioctl.h>
> +#include <linux/types.h>
> +
> +#define BCM_VK_MAX_FILENAME 64
> +
> +struct vk_image {
> +	__u32 type; /* Type of image */
> +#define VK_IMAGE_TYPE_BOOT1 1 /* 1st stage (load to SRAM) */
> +#define VK_IMAGE_TYPE_BOOT2 2 /* 2nd stage (load to DDR) */
> +	char filename[BCM_VK_MAX_FILENAME]; /* Filename of image */

nit, but this should really be __u8 filename[...
right?



> +};
> +
> +struct vk_reset {
> +	__u32 arg1;
> +	__u32 arg2;
> +};
> +
> +#define VK_MAGIC		0x5e
> +
> +/* Load image to Valkyrie */
> +#define VK_IOCTL_LOAD_IMAGE	_IOW(VK_MAGIC, 0x2, struct vk_image)
> +
> +/* Send Reset to Valkyrie */
> +#define VK_IOCTL_RESET		_IOW(VK_MAGIC, 0x4, struct vk_reset)
> +
> +/*
> + * message block - basic unit in the message where a message's size is always
> + *		   N x sizeof(basic_block)
> + */
> +struct vk_msg_blk {
> +	__u8 function_id;
> +#define VK_FID_TRANS_BUF	5
> +#define VK_FID_SHUTDOWN		8
> +	__u8 size;

Size of what?

> +	__u16 trans_id; /* transport id, queue & msg_id */
> +	__u32 context_id;
> +	__u32 args[2];
> +#define VK_CMD_PLANES_MASK	0x000f /* number of planes to up/download */
> +#define VK_CMD_UPLOAD		0x0400 /* memory transfer to vk */
> +#define VK_CMD_DOWNLOAD		0x0500 /* memory transfer from vk */
> +#define VK_CMD_MASK		0x0f00 /* command mask */
> +};

What are these defines for?  The args?  Something else?  It's not really
obvious here...

thanks,

greg k-h