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dmaengine: idxd: export hw version through sysfs

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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: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/158696714008.39484.13401950732606906479.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Dave Jiang 2020-04-15 09:13:12 -07:00 committed by Vinod Koul
parent a4e688535a
commit c2ce6bbcfc
2 changed files with 17 additions and 0 deletions
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6
Documentation/ABI/stable/sysfs-driver-dma-idxd
View file

@ -1,3 +1,9 @@
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

11
drivers/dma/idxd/sysfs.c
View file

@ -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,