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Subject: Re: chrome-platform/for-kernelci bisection:
 baseline.bootrr.rockchip-dp-probed on rk3399-gru-kevin
To:     "kernelci.org bot" <bot@kernelci.org>, gtucker@collabora.com,
        kernelci-results@groups.io,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>
Cc:     linux-kernel@vger.kernel.org, Benson Leung <bleung@chromium.org>,
        Guenter Roeck <groeck@chromium.org>
References: <5f06177f.1c69fb81.ed8e4.1a92@mx.google.com>
From:   Guenter Roeck <linux@roeck-us.net>
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Message-ID: <0d0475a1-c042-8025-f215-d81d04748b75@roeck-us.net>
Date:   Wed, 8 Jul 2020 12:10:55 -0700
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Sender: linux-kernel-owner@vger.kernel.org
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On 7/8/20 11:59 AM, kernelci.org bot wrote:
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> * This automated bisection report was sent to you on the basis  *
> * that you may be involved with the breaking commit it has      *
> * found.  No manual investigation has been done to verify it,   *
> * and the root cause of the problem may be somewhere else.      *
> *                                                               *
> * If you do send a fix, please include this trailer:            *
> *   Reported-by: "kernelci.org bot" <bot@kernelci.org>          *
> *                                                               *
> * Hope this helps!                                              *
> * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
> 
> chrome-platform/for-kernelci bisection: baseline.bootrr.rockchip-dp-probed on rk3399-gru-kevin
> 
> Summary:
>   Start:      154353417996 KERNELCI: x86_64_defconfig: Enable support for Chromebooks devices
>   Plain log:  https://storage.kernelci.org/chrome-platform/for-kernelci/v5.8-rc1-20-g154353417996/arm64/defconfig/gcc-8/lab-collabora/baseline-rk3399-gru-kevin.txt
>   HTML log:   https://storage.kernelci.org/chrome-platform/for-kernelci/v5.8-rc1-20-g154353417996/arm64/defconfig/gcc-8/lab-collabora/baseline-rk3399-gru-kevin.html
>   Result:     8c9a6ef40bf4 platform/chrome: cros_ec_proto: Convert EC error codes to Linux error codes
> 
> Checks:
>   revert:     PASS
>   verify:     PASS
> 
> Parameters:
>   Tree:       chrome-platform
>   URL:        https://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux.git
>   Branch:     for-kernelci
>   Target:     rk3399-gru-kevin
>   CPU arch:   arm64
>   Lab:        lab-collabora
>   Compiler:   gcc-8
>   Config:     defconfig
>   Test case:  baseline.bootrr.rockchip-dp-probed
> 
> Breaking commit found:
> 
> -------------------------------------------------------------------------------
> commit 8c9a6ef40bf400c64c9907031bd32b59f9d4aea2
> Author: Guenter Roeck <linux@roeck-us.net>
> Date:   Sat Jul 4 07:26:07 2020 -0700
> 
>     platform/chrome: cros_ec_proto: Convert EC error codes to Linux error codes
>     
>     The EC reports a variety of error codes. Most of those, with the exception
>     of EC_RES_INVALID_VERSION, are converted to -EPROTO. As result, the actual
>     error code gets lost. Convert all EC errors to Linux error codes to report
>     a more meaningful error to the caller to aid debugging.
>     

Interesting. Well, good that the patch was abandoned, so I don't expect this
to be a problem in practice.

Guenter

>     Cc: Yu-Hsuan Hsu <yuhsuan@chromium.org>
>     Cc: Prashant Malani <pmalani@chromium.org>
>     Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>     Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> 
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index 3e745e0fe092..10aa9e483d35 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -543,6 +543,29 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
>  }
>  EXPORT_SYMBOL(cros_ec_cmd_xfer);
>  
> +static const int cros_ec_error_map[] = {
> +	[EC_RES_INVALID_COMMAND] = -EOPNOTSUPP,
> +	[EC_RES_ERROR] = -EIO,
> +	[EC_RES_INVALID_PARAM] = -EINVAL,
> +	[EC_RES_ACCESS_DENIED] = -EACCES,
> +	[EC_RES_INVALID_RESPONSE] = -EPROTO,
> +	[EC_RES_INVALID_VERSION] = -ENOTSUPP,
> +	[EC_RES_INVALID_CHECKSUM] = -EBADMSG,
> +	[EC_RES_IN_PROGRESS] = -EINPROGRESS,
> +	[EC_RES_UNAVAILABLE] = -ENODATA,
> +	[EC_RES_TIMEOUT] = -ETIMEDOUT,
> +	[EC_RES_OVERFLOW] = -EOVERFLOW,
> +	[EC_RES_INVALID_HEADER] = -EBADR,
> +	[EC_RES_REQUEST_TRUNCATED] = -EBADR,
> +	[EC_RES_RESPONSE_TOO_BIG] = -EFBIG,
> +	[EC_RES_BUS_ERROR] = -EFAULT,
> +	[EC_RES_BUSY] = -EBUSY,
> +	[EC_RES_INVALID_HEADER_VERSION] = -EBADMSG,
> +	[EC_RES_INVALID_HEADER_CRC] = -EBADMSG,
> +	[EC_RES_INVALID_DATA_CRC] = -EBADMSG,
> +	[EC_RES_DUP_UNAVAILABLE] = -ENODATA,
> +};
> +
>  /**
>   * cros_ec_cmd_xfer_status() - Send a command to the ChromeOS EC.
>   * @ec_dev: EC device.
> @@ -555,8 +578,7 @@ EXPORT_SYMBOL(cros_ec_cmd_xfer);
>   *
>   * Return:
>   * >=0 - The number of bytes transferred
> - * -ENOTSUPP - Operation not supported
> - * -EPROTO - Protocol error
> + * <0 - Linux error code
>   */
>  int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
>  			    struct cros_ec_command *msg)
> @@ -566,13 +588,12 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
>  	ret = cros_ec_cmd_xfer(ec_dev, msg);
>  	if (ret < 0) {
>  		dev_err(ec_dev->dev, "Command xfer error (err:%d)\n", ret);
> -	} else if (msg->result == EC_RES_INVALID_VERSION) {
> -		dev_dbg(ec_dev->dev, "Command invalid version (err:%d)\n",
> -			msg->result);
> -		return -ENOTSUPP;
>  	} else if (msg->result != EC_RES_SUCCESS) {
> -		dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
> -		return -EPROTO;
> +		if (msg->result < ARRAY_SIZE(cros_ec_error_map) && cros_ec_error_map[msg->result])
> +			ret = cros_ec_error_map[msg->result];
> +		else
> +			ret = -EPROTO;
> +		dev_dbg(ec_dev->dev, "Command result (err: %d [%d])\n", msg->result, ret);
>  	}
>  
>  	return ret;
> -------------------------------------------------------------------------------
> 
> 
> Git bisection log:
> 
> -------------------------------------------------------------------------------
> git bisect start
> # good: [b3a9e3b9622ae10064826dccb4f7a52bd88c7407] Linux 5.8-rc1
> git bisect good b3a9e3b9622ae10064826dccb4f7a52bd88c7407
> # bad: [15435341799604f20adcbb5f69b7f0beb2a2f964] KERNELCI: x86_64_defconfig: Enable support for Chromebooks devices
> git bisect bad 15435341799604f20adcbb5f69b7f0beb2a2f964
> # good: [3c5ca501b46b91e68b935b4bd752a0aba5232208] platform/chrome: cros_ec_spi: Document missing function parameters
> git bisect good 3c5ca501b46b91e68b935b4bd752a0aba5232208
> # good: [20b736872f7f324438649a277ec711a646ce8e8d] platform/chrome: cros_ec_typec: Add PM support
> git bisect good 20b736872f7f324438649a277ec711a646ce8e8d
> # bad: [8c9a6ef40bf400c64c9907031bd32b59f9d4aea2] platform/chrome: cros_ec_proto: Convert EC error codes to Linux error codes
> git bisect bad 8c9a6ef40bf400c64c9907031bd32b59f9d4aea2
> # good: [e48bc01ed5adec203676c735365373b31c3c7600] platform/chrome: cros_ec_sensorhub: Fix EC timestamp overflow
> git bisect good e48bc01ed5adec203676c735365373b31c3c7600
> # first bad commit: [8c9a6ef40bf400c64c9907031bd32b59f9d4aea2] platform/chrome: cros_ec_proto: Convert EC error codes to Linux error codes
> -------------------------------------------------------------------------------
>