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cdx: add sysfs for bus reset

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Add sysfs interface reset to reset all the devices on the CDX bus.

Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
Link: https://lore.kernel.org/r/20231017160505.10640-7-abhijit.gangurde@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Abhijit Gangurde
2023-10-17 21:35:04 +05:30
committed by Greg Kroah-Hartman
parent e3cfd49cb9
commit 0174f58104
2 changed files with 26 additions and 8 deletions
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26
drivers/cdx/cdx.c
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@ -110,6 +110,20 @@ int cdx_dev_reset(struct device *dev)
}
EXPORT_SYMBOL_GPL(cdx_dev_reset);
/**
* reset_cdx_device - Reset a CDX device
* @dev: CDX device
* @data: This is always passed as NULL, and is not used in this API,
* but is required here as the device_for_each_child() API expects
* the passed function to have this as an argument.
*
* Return: -errno on failure, 0 on success.
*/
static int reset_cdx_device(struct device *dev, void *data)
{
return cdx_dev_reset(dev);
}
/**
* cdx_unregister_device - Unregister a CDX device
* @dev: CDX device
@ -343,6 +357,7 @@ static DEVICE_ATTR_WO(remove);
static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct cdx_device *cdx_dev = to_cdx_device(dev);
bool val;
int ret;
@ -352,11 +367,13 @@ static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
if (!val)
return -EINVAL;
ret = cdx_dev_reset(dev);
if (ret)
return ret;
if (cdx_dev->is_bus)
/* Reset all the devices attached to cdx bus */
ret = device_for_each_child(dev, NULL, reset_cdx_device);
else
ret = cdx_dev_reset(dev);
return count;
return ret < 0 ? ret : count;
}
static DEVICE_ATTR_WO(reset);
@ -461,6 +478,7 @@ static const struct attribute_group cdx_dev_group = {
static struct attribute *cdx_bus_dev_attrs[] = {
&dev_attr_enable.attr,
&dev_attr_reset.attr,
NULL,
};