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mei: show the HBM protocol versions in the device attributes 

The HBM protocol version is negotiated during the setup phase, then settled
on a highest possible common version of the driver and the firmware.
The sysfs API advertises both negotiated and driver supported versions
in the device attributes.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
hifive-unleashed-5.1
Alexander Usyskin 2016-10-30 01:42:18 +02:00 committed by Greg Kroah-Hartman
parent d3f45647a4
commit 88d1bece89
2 changed files with 58 additions and 1 deletions
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16
Documentation/ABI/testing/sysfs-class-mei
View File

@ -29,3 +29,19 @@ Description: Display fw status registers content
Also number of registers varies between 1 and 6
depending on generation.
What: /sys/class/mei/meiN/hbm_ver
Date: Aug 2016
KernelVersion: 4.9
Contact: Tomas Winkler <tomas.winkler@intel.com>
Description: Display the negotiated HBM protocol version.
The HBM protocol version negotiated
between the driver and the device.
What: /sys/class/mei/meiN/hbm_ver_drv
Date: Aug 2016
KernelVersion: 4.9
Contact: Tomas Winkler <tomas.winkler@intel.com>
Description: Display the driver HBM protocol version.
The HBM protocol version supported by the driver.

43
drivers/misc/mei/main.c
View File

@ -653,7 +653,7 @@ static int mei_fasync(int fd, struct file *file, int band)
}
/**
* fw_status_show - mei device attribute show method
* fw_status_show - mei device fw_status attribute show method
*
* @device: device pointer
* @attr: attribute pointer
@ -684,8 +684,49 @@ static ssize_t fw_status_show(struct device *device,
}
static DEVICE_ATTR_RO(fw_status);
/**
* hbm_ver_show - display HBM protocol version negotiated with FW
*
* @device: device pointer
* @attr: attribute pointer
* @buf: char out buffer
*
* Return: number of the bytes printed into buf or error
*/
static ssize_t hbm_ver_show(struct device *device,
struct device_attribute *attr, char *buf)
{
struct mei_device *dev = dev_get_drvdata(device);
struct hbm_version ver;
mutex_lock(&dev->device_lock);
ver = dev->version;
mutex_unlock(&dev->device_lock);
return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version);
}
static DEVICE_ATTR_RO(hbm_ver);
/**
* hbm_ver_drv_show - display HBM protocol version advertised by driver
*
* @device: device pointer
* @attr: attribute pointer
* @buf: char out buffer
*
* Return: number of the bytes printed into buf or error
*/
static ssize_t hbm_ver_drv_show(struct device *device,
struct device_attribute *attr, char *buf)
{
return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION);
}
static DEVICE_ATTR_RO(hbm_ver_drv);
static struct attribute *mei_attrs[] = {
&dev_attr_fw_status.attr,
&dev_attr_hbm_ver.attr,
&dev_attr_hbm_ver_drv.attr,
NULL
};
ATTRIBUTE_GROUPS(mei);