From 9065958ee6dd752c7e1bbacbb79fe5f5f2218393 Mon Sep 17 00:00:00 2001
From: Dave Jiang <dave.jiang@intel.com>
Date: Mon, 24 Feb 2020 11:01:34 -0700
Subject: [PATCH] dmaengine: idxd: expose general capabilities register in sysfs
Git-commit: 9065958ee6dd752c7e1bbacbb79fe5f5f2218393
Patch-mainline: v5.7-rc1
References: jsc#SLE-12688

There are some capabilities for the device that are interesting to user
apps that are interacting directly with the device. Expose gencap register
in sysfs to allow that information.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/158256729399.55526.10842505054968710547.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/dma/idxd/sysfs.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/dma/idxd/sysfs.c b/drivers/dma/idxd/sysfs.c
index e4f35bdf252e..a74e99cb055d 100644
--- a/drivers/dma/idxd/sysfs.c
+++ b/drivers/dma/idxd/sysfs.c
@@ -1160,6 +1160,16 @@ static ssize_t op_cap_show(struct device *dev,
 }
 static DEVICE_ATTR_RO(op_cap);
 
+static ssize_t gen_cap_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, "%#llx\n", idxd->hw.gen_cap.bits);
+}
+static DEVICE_ATTR_RO(gen_cap);
+
 static ssize_t configurable_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
@@ -1297,6 +1307,7 @@ static struct attribute *idxd_device_attributes[] = {
 	&dev_attr_max_batch_size.attr,
 	&dev_attr_max_transfer_size.attr,
 	&dev_attr_op_cap.attr,
+	&dev_attr_gen_cap.attr,
 	&dev_attr_configurable.attr,
 	&dev_attr_clients.attr,
 	&dev_attr_state.attr,
-- 
2.16.4