linux-kernel - Re: [PATCH 1/3] remoteproc: k3-dsp: Fix usage of omap_mbox_message and mbox_msg

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Date: Thu, 28 Mar 2024 09:28:11 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Andrew Davis <afd@...com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] remoteproc: k3-dsp: Fix usage of omap_mbox_message
 and mbox_msg_t

Hi Andrew,

On Mon, Mar 25, 2024 at 11:58:06AM -0500, Andrew Davis wrote:
> The type of message sent using omap-mailbox is always u32. The definition
> of mbox_msg_t is uintptr_t which is wrong as that type changes based on
> the architecture (32bit vs 64bit). Use u32 unconditionally and remove
> the now unneeded omap-mailbox.h include.
> 
> Signed-off-by: Andrew Davis <afd@...com>
> ---
>  drivers/remoteproc/ti_k3_dsp_remoteproc.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/remoteproc/ti_k3_dsp_remoteproc.c b/drivers/remoteproc/ti_k3_dsp_remoteproc.c
> index 3555b535b1683..33b30cfb86c9d 100644
> --- a/drivers/remoteproc/ti_k3_dsp_remoteproc.c
> +++ b/drivers/remoteproc/ti_k3_dsp_remoteproc.c
> @@ -11,7 +11,6 @@
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_reserved_mem.h>
> -#include <linux/omap-mailbox.h>
>  #include <linux/platform_device.h>
>  #include <linux/remoteproc.h>
>  #include <linux/reset.h>
> @@ -113,7 +112,7 @@ static void k3_dsp_rproc_mbox_callback(struct mbox_client *client, void *data)
>  						  client);
>  	struct device *dev = kproc->rproc->dev.parent;
>  	const char *name = kproc->rproc->name;
> -	u32 msg = omap_mbox_message(data);
> +	u32 msg = (u32)(uintptr_t)(data);
>  

Looking at omap-mailbox.h and unless I'm missing something, the end result is
the same.


>  	dev_dbg(dev, "mbox msg: 0x%x\n", msg);
>  
> @@ -152,11 +151,11 @@ static void k3_dsp_rproc_kick(struct rproc *rproc, int vqid)
>  {
>  	struct k3_dsp_rproc *kproc = rproc->priv;
>  	struct device *dev = rproc->dev.parent;
> -	mbox_msg_t msg = (mbox_msg_t)vqid;
> +	u32 msg = vqid;
>  	int ret;
> 

Here @vqid becomes a 'u32' rather than a 'uintptr'...

>  	/* send the index of the triggered virtqueue in the mailbox payload */
> -	ret = mbox_send_message(kproc->mbox, (void *)msg);
> +	ret = mbox_send_message(kproc->mbox, (void *)(uintptr_t)msg);

.. but here it is casted as a 'uintptr_t', which yields the same result.


I am puzzled - other than getting rid of a header file I don't see what else
this patch does.

Thanks,
Mathieu

>  	if (ret < 0)
>  		dev_err(dev, "failed to send mailbox message (%pe)\n",
>  			ERR_PTR(ret));
> -- 
> 2.39.2
>