linux-kernel - Re: [Intel-gfx] [PATCH v8 14/16] mei: debugfs: add pxp mode to devstate in debugfs

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Date:   Wed, 7 Sep 2022 12:26:31 -0700
From:   "Ceraolo Spurio, Daniele" <daniele.ceraolospurio@...el.com>
To:     Tomas Winkler <tomas.winkler@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
CC:     <intel-gfx@...ts.freedesktop.org>,
        Alexander Usyskin <alexander.usyskin@...el.com>,
        <linux-kernel@...r.kernel.org>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Vitaly Lubart <vitaly.lubart@...el.com>
Subject: Re: [Intel-gfx] [PATCH v8 14/16] mei: debugfs: add pxp mode to
 devstate in debugfs



On 9/7/2022 8:58 AM, Tomas Winkler wrote:
> Add pxp mode devstate to debugfs to monitor pxp state machine progress.
> This is useful to debug issues in scenarios in which the pxp state
> needs to be re-initialized, like during power transitions such as
> suspend/resume. With this debugfs the state could be monitored
> to ensure that pxp is in the ready state.
>
> CC: Vitaly Lubart <vitaly.lubart@...el.com>
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>

This is unchanged from the previously reviewed rev (apart from the 
header update), so this still applies:

Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@...el.com>

Daniele

> ---
>   drivers/misc/mei/debugfs.c | 19 ++++++++++++++++++-
>   1 file changed, 18 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
> index 1ce61e9e24fc..3b098d4c8e3d 100644
> --- a/drivers/misc/mei/debugfs.c
> +++ b/drivers/misc/mei/debugfs.c
> @@ -1,6 +1,6 @@
>   // SPDX-License-Identifier: GPL-2.0
>   /*
> - * Copyright (c) 2012-2016, Intel Corporation. All rights reserved
> + * Copyright (c) 2012-2022, Intel Corporation. All rights reserved
>    * Intel Management Engine Interface (Intel MEI) Linux driver
>    */
>   
> @@ -86,6 +86,20 @@ static int mei_dbgfs_active_show(struct seq_file *m, void *unused)
>   }
>   DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_active);
>   
> +static const char *mei_dev_pxp_mode_str(enum mei_dev_pxp_mode state)
> +{
> +#define MEI_PXP_MODE(state) case MEI_DEV_PXP_##state: return #state
> +	switch (state) {
> +	MEI_PXP_MODE(DEFAULT);
> +	MEI_PXP_MODE(INIT);
> +	MEI_PXP_MODE(SETUP);
> +	MEI_PXP_MODE(READY);
> +	default:
> +		return "unknown";
> +	}
> +#undef MEI_PXP_MODE
> +}
> +
>   static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused)
>   {
>   	struct mei_device *dev = m->private;
> @@ -112,6 +126,9 @@ static int mei_dbgfs_devstate_show(struct seq_file *m, void *unused)
>   	seq_printf(m, "pg:  %s, %s\n",
>   		   mei_pg_is_enabled(dev) ? "ENABLED" : "DISABLED",
>   		   mei_pg_state_str(mei_pg_state(dev)));
> +
> +	seq_printf(m, "pxp: %s\n", mei_dev_pxp_mode_str(dev->pxp_mode));
> +
>   	return 0;
>   }
>   DEFINE_SHOW_ATTRIBUTE(mei_dbgfs_devstate);