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Message-ID: <20230711121027.936487-3-abhijit.gangurde@amd.com>
Date: Tue, 11 Jul 2023 17:40:25 +0530
From: Abhijit Gangurde <abhijit.gangurde@....com>
To: <gregkh@...uxfoundation.org>, <linux-kernel@...r.kernel.org>
CC: <Nipun.Gupta@....com>, <nikhil.agarwal@....com>,
<puneet.gupta@....com>, <git@....com>, <michal.simek@....com>,
Abhijit Gangurde <abhijit.gangurde@....com>,
Nipun Gupta <nipun.gupta@....com>,
"Pieter Jansen van Vuuren" <pieter.jansen-van-vuuren@....com>
Subject: [PATCH 2/4] cdx: add sysfs for reset_all
Add sysfs for reset_all entry which resets all the
devices on the CDX bus.
Co-developed-by: Puneet Gupta <puneet.gupta@....com>
Signed-off-by: Puneet Gupta <puneet.gupta@....com>
Co-developed-by: Nipun Gupta <nipun.gupta@....com>
Signed-off-by: Nipun Gupta <nipun.gupta@....com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@....com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
Tested-by: Nikhil Agarwal <nikhil.agarwal@....com>
---
Documentation/ABI/testing/sysfs-bus-cdx | 11 ++++++++++
drivers/cdx/cdx.c | 29 +++++++++++++++++++++++++
2 files changed, 40 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-bus-cdx b/Documentation/ABI/testing/sysfs-bus-cdx
index 0afa85b3c63b..d9e00058471d 100644
--- a/Documentation/ABI/testing/sysfs-bus-cdx
+++ b/Documentation/ABI/testing/sysfs-bus-cdx
@@ -22,6 +22,17 @@ Description:
# echo 0 > /sys/bus/cdx/enable
+What: /sys/bus/cdx/reset_all
+Date: July 2023
+Contact: puneet.gupta@....com
+Description:
+ Writing y/1/on to this file resets all the devices
+ present on the CDX bus
+
+ For example::
+
+ # echo 1 > /sys/bus/cdx/reset_all
+
What: /sys/bus/cdx/devices/.../vendor
Date: March 2023
Contact: nipun.gupta@....com
diff --git a/drivers/cdx/cdx.c b/drivers/cdx/cdx.c
index 48c493a43491..4d20047b55bb 100644
--- a/drivers/cdx/cdx.c
+++ b/drivers/cdx/cdx.c
@@ -106,6 +106,11 @@ int cdx_dev_reset(struct device *dev)
}
EXPORT_SYMBOL_GPL(cdx_dev_reset);
+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
@@ -433,9 +438,33 @@ static ssize_t rescan_store(const struct bus_type *bus,
}
static BUS_ATTR_WO(rescan);
+static ssize_t reset_all_store(const struct bus_type *bus,
+ const char *buf, size_t count)
+{
+ bool val;
+ int ret;
+
+ if (kstrtobool(buf, &val) < 0)
+ return -EINVAL;
+
+ if (!val)
+ return -EINVAL;
+
+ /* Reset all the devices attached to cdx bus */
+ ret = bus_for_each_dev(bus, NULL, NULL, reset_cdx_device);
+ if (ret) {
+ pr_err("error in CDX bus reset\n");
+ return 0;
+ }
+
+ return count;
+}
+static BUS_ATTR_WO(reset_all);
+
static struct attribute *cdx_bus_attrs[] = {
&bus_attr_enable.attr,
&bus_attr_rescan.attr,
+ &bus_attr_reset_all.attr,
NULL,
};
ATTRIBUTE_GROUPS(cdx_bus);
--
2.25.1
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