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

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Date:   Wed, 23 Sep 2020 16:55:14 -0700
From:   Scott Branden <scott.branden@...adcom.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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

Hi Greg,

On 2020-09-07 5:35 a.m., Greg Kroah-Hartman wrote:
> 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?
Changed to __u8.  Thanks.
>
>
>
>> +};
>> +
>> +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?
Size is number of vk_msg_blk's.  Comment is above the struct.
Can add a comment on this line as well.
>
>> +	__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...
Agree, it's not really obvious and is confusing.
When args[0] is a command the defines apply.
Will add comments.
>
> thanks,
>
> greg k-h


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