From c2ce6bbcfc9f142b426717bc5aa3f9ba20485a65 Mon Sep 17 00:00:00 2001
From: Dave Jiang <dave.jiang@intel.com>
Date: Wed, 15 Apr 2020 09:13:12 -0700
Subject: [PATCH] dmaengine: idxd: export hw version through sysfs
Git-commit: c2ce6bbcfc9f142b426717bc5aa3f9ba20485a65
Patch-mainline: v5.8-rc1
References: jsc#SLE-12688
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
Documentation/ABI/stable/sysfs-driver-dma-idxd | 6 ++++++
drivers/dma/idxd/sysfs.c | 11 +++++++++++
2 files changed, 17 insertions(+)
--- a/Documentation/ABI/stable/sysfs-driver-dma-idxd
+++ b/Documentation/ABI/stable/sysfs-driver-dma-idxd
@@ -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
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -1092,6 +1092,16 @@ static const struct attribute_group *idx
};
/* 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 de
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,