linux-kernel - Re: [PATCH 09/11] media: vsp1: Provide support for extended command pools

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Message-ID: <20180312163045.GE12967@w540>
Date:   Mon, 12 Mar 2018 17:30:45 +0100
From:   jacopo mondi <jacopo@...ndi.org>
To:     Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        linux-renesas-soc@...r.kernel.org, linux-media@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/11] media: vsp1: Provide support for extended command
 pools

Hi Kieran,
    just one small thing I noticed below...

On Fri, Mar 09, 2018 at 10:04:07PM +0000, Kieran Bingham wrote:
> VSPD and VSP-DL devices can provide extended display lists supporting
> extended command display list objects.
>
> These extended commands require their own dma memory areas for a header
> and body specific to the command type.
>
> Implement a command pool to allocate all necessary memory in a single
> DMA allocation to reduce pressure on the TLB, and provide convenvient
> re-usable command objects for the entities to utilise.
>
> Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> ---
>  drivers/media/platform/vsp1/vsp1_dl.c | 189 +++++++++++++++++++++++++++-
>  drivers/media/platform/vsp1/vsp1_dl.h |   3 +-
>  2 files changed, 192 insertions(+)
>
> diff --git a/drivers/media/platform/vsp1/vsp1_dl.c b/drivers/media/platform/vsp1/vsp1_dl.c
> index 36440a2a2c8b..6d17b8bfa21c 100644
> --- a/drivers/media/platform/vsp1/vsp1_dl.c
> +++ b/drivers/media/platform/vsp1/vsp1_dl.c
> @@ -121,6 +121,30 @@ struct vsp1_dl_body_pool {
>  };
>
>  /**
> + * struct vsp1_cmd_pool - display list body pool
> + * @dma: DMA address of the entries
> + * @size: size of the full DMA memory pool in bytes
> + * @mem: CPU memory pointer for the pool
> + * @bodies: Array of DLB structures for the pool
> + * @free: List of free DLB entries
> + * @lock: Protects the pool and free list
> + * @vsp1: the VSP1 device
> + */
> +struct vsp1_dl_cmd_pool {
> +	/* DMA allocation */
> +	dma_addr_t dma;
> +	size_t size;
> +	void *mem;
> +
> +	struct vsp1_dl_ext_cmd *cmds;
> +	struct list_head free;
> +
> +	spinlock_t lock;
> +
> +	struct vsp1_device *vsp1;
> +};
> +
> +/**
>   * struct vsp1_dl_list - Display list
>   * @list: entry in the display list manager lists
>   * @dlm: the display list manager
> @@ -176,6 +200,7 @@ struct vsp1_dl_manager {
>  	struct vsp1_dl_list *pending;
>
>  	struct vsp1_dl_body_pool *pool;
> +	struct vsp1_dl_cmd_pool *autfld_cmds;
>  };
>
>  /* -----------------------------------------------------------------------------
> @@ -339,6 +364,139 @@ void vsp1_dl_body_write(struct vsp1_dl_body *dlb, u32 reg, u32 data)
>  }
>
>  /* -----------------------------------------------------------------------------
> + * Display List Extended Command Management
> + */
> +
> +enum vsp1_extcmd_type {
> +	VSP1_EXTCMD_AUTODISP,
> +	VSP1_EXTCMD_AUTOFLD,
> +};
> +
> +struct vsp1_extended_command_info {
> +	u16 opcode;
> +	size_t body_size;
> +} vsp1_extended_commands[] = {
> +	[VSP1_EXTCMD_AUTODISP] = { 0x02, 96 },
> +	[VSP1_EXTCMD_AUTOFLD]  = { 0x03, 160 },
> +};

How about making this one static and const, since it does not get
modified?

Thanks
   j

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