Commit c2ce6bbc authored by Dave Jiang's avatar Dave Jiang Committed by Vinod Koul
Browse files

dmaengine: idxd: export hw version through sysfs 



Some user apps would like to know the hardware version in order to
determine the variation of the hardware. Export the hardware version number
to userspace via sysfs.

Signed-off-by: default avatarDave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/158696714008.39484.13401950732606906479.stgit@djiang5-desk3.ch.intel.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent a4e68853

Documentation/ABI/stable/sysfs-driver-dma-idxd

+6 −0
Original line number Diff line number Diff line 
What:		sys/bus/dsa/devices/dsa<m>/version

Date:		Apr 15, 2020

KernelVersion:	5.8.0

Contact:	dmaengine@vger.kernel.org

Description:	The hardware version number.



What:           sys/bus/dsa/devices/dsa<m>/cdev_major

Date:           Oct 25, 2019

KernelVersion: 	5.6.0

drivers/dma/idxd/sysfs.c

+11 −0
Original line number Diff line number Diff line
@@ -1092,6 +1092,16 @@ static const struct attribute_group *idxd_wq_attribute_groups[] = { 
};



/* IDXD device attribs */

static ssize_t version_show(struct device *dev, struct device_attribute *attr,

			    char *buf)

{

	struct idxd_device *idxd =

		container_of(dev, struct idxd_device, conf_dev);



	return sprintf(buf, "%#x\n", idxd->hw.version);

}

static DEVICE_ATTR_RO(version);



static ssize_t max_work_queues_size_show(struct device *dev,

					 struct device_attribute *attr,

					 char *buf)
@@ -1313,6 +1323,7 @@ static ssize_t cdev_major_show(struct device *dev, 
static DEVICE_ATTR_RO(cdev_major);



static struct attribute *idxd_device_attributes[] = {

	&dev_attr_version.attr,

	&dev_attr_max_groups.attr,

	&dev_attr_max_work_queues.attr,

	&dev_attr_max_work_queues_size.attr,