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Mon, 31 Jul 2023 07:10:42 -0500 Received: from SATLEXMB03.amd.com (10.181.40.144) by SATLEXMB07.amd.com (10.181.41.45) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Mon, 31 Jul 2023 05:10:41 -0700 Received: from xhdipdslab59.xilinx.com (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server id 15.1.2507.27 via Frontend Transport; Mon, 31 Jul 2023 07:10:33 -0500 From: Abhijit Gangurde To: , , CC: , , , , Abhijit Gangurde , "Puneet Gupta" , Nipun Gupta , "Pieter Jansen van Vuuren" Subject: [PATCH v2 3/4] cdx: add sysfs for bus reset Date: Mon, 31 Jul 2023 17:38:12 +0530 Message-ID: <20230731120813.123247-4-abhijit.gangurde@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230731120813.123247-1-abhijit.gangurde@amd.com> References: <20230731120813.123247-1-abhijit.gangurde@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF000042A7:EE_|PH7PR12MB8121:EE_ X-MS-Office365-Filtering-Correlation-Id: af7075d5-ee21-4597-b4b3-08db91bf29e2 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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Co-developed-by: Puneet Gupta Signed-off-by: Puneet Gupta Co-developed-by: Nipun Gupta Signed-off-by: Nipun Gupta Signed-off-by: Abhijit Gangurde Reviewed-by: Pieter Jansen van Vuuren Tested-by: Nikhil Agarwal --- Documentation/ABI/testing/sysfs-bus-cdx | 15 +++++++++ drivers/cdx/cdx.c | 41 +++++++++++++++++++++++++ 2 files changed, 56 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-cdx b/Documentation/ABI/testing/sysfs-bus-cdx index 04c8dfe7e201..d25875359741 100644 --- a/Documentation/ABI/testing/sysfs-bus-cdx +++ b/Documentation/ABI/testing/sysfs-bus-cdx @@ -38,6 +38,21 @@ Description: # echo 00 > /sys/bus/cdx/disable +What: /sys/bus/cdx/reset +Date: July 2023 +Contact: puneet.gupta@amd.com +Description: + Writing bus number in hex to this file will attempt to reset + all the devices present on the bus. Resetting a device would + clear all existing configuration of the device and put the + device in default state. The bus number for the cdx devices can + be found at /sys/bus/cdx/devices/cdx-BB:DD, where BB denotes + the bus number for the respective device. + + For example :: + + # echo 00 > /sys/bus/cdx/reset + What: /sys/bus/cdx/devices/.../vendor Date: March 2023 Contact: nipun.gupta@amd.com diff --git a/drivers/cdx/cdx.c b/drivers/cdx/cdx.c index 28c38cc4e4f6..76219d35e321 100644 --- a/drivers/cdx/cdx.c +++ b/drivers/cdx/cdx.c @@ -112,6 +112,26 @@ int cdx_dev_reset(struct device *dev) } EXPORT_SYMBOL_GPL(cdx_dev_reset); +/** + * reset_cdx_device - Reset a CDX device + * @dev: CDX device + * @data: Bus number + * If bus number matches to the device's bus then this device + * is reset else this is no op. + * + * Return: -errno on failure, 0 on success. + */ +static int reset_cdx_device(struct device *dev, void *data) +{ + struct cdx_device *cdx_dev = to_cdx_device(dev); + u8 bus_num = *((u8 *)data); + + if (cdx_dev->bus_num == bus_num) + return cdx_dev_reset(dev); + + return 0; +} + /** * cdx_unregister_device - Unregister a CDX device * @dev: CDX device @@ -485,10 +505,31 @@ static ssize_t rescan_store(const struct bus_type *bus, } static BUS_ATTR_WO(rescan); +static ssize_t bus_reset_store(const struct bus_type *bus, + const char *buf, size_t count) +{ + u8 bus_id; + int ret; + + if (kstrtou8(buf, 16, &bus_id)) + return -EINVAL; + + bus_id = BUS_ID(bus_id); + mutex_lock(&cdx_controller_lock); + /* Reset all the devices attached to cdx bus */ + ret = bus_for_each_dev(bus, NULL, (void *)&bus_id, reset_cdx_device); + mutex_unlock(&cdx_controller_lock); + + return ret < 0 ? ret : count; +} +static struct bus_attribute bus_attr_reset = __ATTR(reset, 0200, NULL, + bus_reset_store); + static struct attribute *cdx_bus_attrs[] = { &bus_attr_enable.attr, &bus_attr_disable.attr, &bus_attr_rescan.attr, + &bus_attr_reset.attr, NULL, }; ATTRIBUTE_GROUPS(cdx_bus);