linux-kernel - Re: [PATCH v6 02/19] platform/x86: intel_scu_ipc: Log more information if SCU IPC command fails

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Date:   Mon, 17 Feb 2020 16:08:51 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Lee Jones <lee.jones@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Zha Qipeng <qipeng.zha@...el.com>,
        "David E . Box" <david.e.box@...ux.intel.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 02/19] platform/x86: intel_scu_ipc: Log more
 information if SCU IPC command fails

On Mon, Feb 17, 2020 at 04:14:29PM +0300, Mika Westerberg wrote:
> Currently we only log an error if the command times out which makes it
> hard to figure out the failing command. This changes the driver to log
> command and subcommand with the error code which should make debugging
> easier. This also allows us to simplify the callers as they don't need
> to log these errors themselves.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> 
> Signed-off-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> ---
>  drivers/platform/x86/intel_scu_ipc.c | 17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c
> index 19c2cc41fb05..7512d550b375 100644
> --- a/drivers/platform/x86/intel_scu_ipc.c
> +++ b/drivers/platform/x86/intel_scu_ipc.c
> @@ -147,7 +147,6 @@ static inline int busy_loop(struct intel_scu_ipc_dev *scu)
>  		usleep_range(50, 100);
>  	} while (time_before(jiffies, end));
>  
> -	dev_err(&scu->dev, "IPC timed out");
>  	return -ETIMEDOUT;
>  }
>  
> @@ -156,10 +155,8 @@ static inline int ipc_wait_for_interrupt(struct intel_scu_ipc_dev *scu)
>  {
>  	int status;
>  
> -	if (!wait_for_completion_timeout(&scu->cmd_complete, IPC_TIMEOUT)) {
> -		dev_err(&scu->dev, "IPC timed out\n");
> +	if (!wait_for_completion_timeout(&scu->cmd_complete, IPC_TIMEOUT))
>  		return -ETIMEDOUT;
> -	}
>  
>  	status = ipc_read_status(scu);
>  	if (status & IPC_STATUS_ERR)
> @@ -331,6 +328,7 @@ EXPORT_SYMBOL(intel_scu_ipc_update_register);
>  int intel_scu_ipc_simple_command(int cmd, int sub)
>  {
>  	struct intel_scu_ipc_dev *scu;
> +	u32 cmdval;
>  	int err;
>  
>  	mutex_lock(&ipclock);
> @@ -339,9 +337,12 @@ int intel_scu_ipc_simple_command(int cmd, int sub)
>  		return -ENODEV;
>  	}
>  	scu = ipcdev;
> -	ipc_command(scu, sub << 12 | cmd);
> +	cmdval = sub << 12 | cmd;
> +	ipc_command(scu, cmdval);
>  	err = intel_scu_ipc_check_status(scu);
>  	mutex_unlock(&ipclock);
> +	if (err)
> +		dev_err(&scu->dev, "IPC command %#x failed with %d\n", cmdval, err);
>  	return err;
>  }
>  EXPORT_SYMBOL(intel_scu_ipc_simple_command);
> @@ -362,6 +363,7 @@ int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
>  			  u32 *out, int outlen)
>  {
>  	struct intel_scu_ipc_dev *scu;
> +	u32 cmdval;
>  	int i, err;
>  
>  	mutex_lock(&ipclock);
> @@ -374,7 +376,8 @@ int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
>  	for (i = 0; i < inlen; i++)
>  		ipc_data_writel(scu, *in++, 4 * i);
>  
> -	ipc_command(scu, (inlen << 16) | (sub << 12) | cmd);
> +	cmdval = (inlen << 16) | (sub << 12) | cmd;
> +	ipc_command(scu, cmdval);
>  	err = intel_scu_ipc_check_status(scu);
>  
>  	if (!err) {
> @@ -383,6 +386,8 @@ int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
>  	}
>  
>  	mutex_unlock(&ipclock);
> +	if (err)
> +		dev_err(&scu->dev, "IPC command %#x failed with %d\n", cmdval, err);
>  	return err;
>  }
>  EXPORT_SYMBOL(intel_scu_ipc_command);
> -- 
> 2.25.0
> 

-- 
With Best Regards,
Andy Shevchenko