linux-kernel - Re: [PATCH 5/7] bcm-vk: add bcm

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Date:   Tue, 27 Aug 2019 15:49:38 +0100
From:   Kieran Bingham <kieran.bingham@...asonboard.com>
To:     Scott Branden <scott.branden@...adcom.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Brown <david.brown@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>, bjorn.andersson@...aro.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Olof Johansson <olof@...om.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Colin Ian King <colin.king@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Takashi Iwai <tiwai@...e.de>, linux-kselftest@...r.kernel.org,
        Ohad Ben-Cohen <ohad@...ery.com>
Subject: Re: [PATCH 5/7] bcm-vk: add bcm_vk UAPI

Hi Scott,

On 22/08/2019 20:24, 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 | 88 ++++++++++++++++++++++++++++++++
>  1 file changed, 88 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..df7dfd7f0702
> --- /dev/null
> +++ b/include/uapi/linux/misc/bcm_vk.h
> @@ -0,0 +1,88 @@
> +/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) */
> +/*
> + * Copyright(c) 2018 Broadcom
> + */
> +
> +#ifndef __UAPI_LINUX_MISC_BCM_VK_H
> +#define __UAPI_LINUX_MISC_BCM_VK_H
> +
> +#include <linux/ioctl.h>
> +#include <linux/types.h>
> +
> +struct vk_metadata {
> +	/* struct version, always backwards compatible */
> +	__u32 version;
> +
> +	/* Version 0 fields */
> +	__u32 card_status;
> +#define VK_CARD_STATUS_FASTBOOT_READY BIT(0)
> +#define VK_CARD_STATUS_FWLOADER_READY BIT(1)
> +
> +	__u32 firmware_version;
> +	__u32 fw_status;
> +	/* End version 0 fields */
> +
> +	__u64 reserved[14];
> +	/* Total of 16*u64 for all versions */
> +};
> +
> +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[64]; /* Filename of image */
> +};
> +
> +/* default firmware images names */
> +#define VK_BOOT1_DEF_FILENAME	    "vk-boot1.bin"
> +#define VK_BOOT2_DEF_FILENAME	    "vk-boot2.bin"
> +
> +struct vk_access {
> +	__u8 barno;     /* BAR number to use */
> +	__u8 type;      /* Type of access */
> +#define VK_ACCESS_READ 0
> +#define VK_ACCESS_WRITE 1
> +	__u32 len;      /* length of data */
> +	__u64 offset;   /* offset in BAR */
> +	__u32 *data;    /* where to read/write data to */
> +};
> +
> +struct vk_reset {
> +	__u32 arg1;
> +	__u32 arg2;
> +};
> +
> +#define VK_MAGIC              0x5E
> +
> +/* Get metadata from Valkyrie (firmware version, card status, etc) */
> +#define VK_IOCTL_GET_METADATA _IOR(VK_MAGIC, 0x1, struct vk_metadata)
> +
> +/* Load image to Valkyrie */
> +#define VK_IOCTL_LOAD_IMAGE   _IOW(VK_MAGIC, 0x2, struct vk_image)
> +
> +/* Read data from Valkyrie */
> +#define VK_IOCTL_ACCESS_BAR   _IOWR(VK_MAGIC, 0x3, struct vk_access)
> +
> +/* Send Reset to Valkyrie */
> +#define VK_IOCTL_RESET        _IOW(VK_MAGIC, 0x4, struct vk_reset)

It sounds a bit like the valkyrie is a generic asynchronous coprocessor,
does it merit using the remoteproc interfaces to control it ?

Or is it really just a single purpose cell doing video operations ?

--
Kieran

> +
> +/*
> + * 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;
> +	__u16 queue_id:4;
> +	__u16 msg_id:12;
> +	__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 */
> +};
> +
> +#endif /* __UAPI_LINUX_MISC_BCM_VK_H */
> 

-- 
Regards
--
Kieran