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Mon, 14 Aug 2023 05:23:40 -0500 From: Abhijit Gangurde To: , , CC: , , , , , Abhijit Gangurde , Nipun Gupta , "Pieter Jansen van Vuuren" Subject: [PATCH v3 4/5] cdx: add sysfs for bus reset Date: Mon, 14 Aug 2023 15:52:22 +0530 Message-ID: <20230814102223.418046-5-abhijit.gangurde@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230814102223.418046-1-abhijit.gangurde@amd.com> References: <20230814102223.418046-1-abhijit.gangurde@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CY4PEPF0000EDD6:EE_|MW4PR12MB7381:EE_ X-MS-Office365-Filtering-Correlation-Id: a139f0c7-130c-4d4c-d53b-08db9cb08d22 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230028)(4636009)(136003)(396003)(376002)(346002)(39860400002)(82310400008)(451199021)(1800799006)(186006)(46966006)(40470700004)(36840700001)(40480700001)(54906003)(110136005)(6666004)(40460700003)(478600001)(81166007)(356005)(82740400003)(5660300002)(2906002)(36756003)(86362001)(44832011)(4326008)(70206006)(70586007)(41300700001)(8936002)(8676002)(316002)(336012)(1076003)(26005)(36860700001)(47076005)(83380400001)(2616005)(426003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Aug 2023 10:23:49.8167 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: a139f0c7-130c-4d4c-d53b-08db9cb08d22 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CY4PEPF0000EDD6.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7381 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Add sysfs interface reset to reset all the devices on the CDX bus. 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/te= sting/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: =20 # echo 00 > /sys/bus/cdx/disable =20 +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 411beb035fdd..6c48b322a8f2 100644 --- a/drivers/cdx/cdx.c +++ b/drivers/cdx/cdx.c @@ -114,6 +114,26 @@ int cdx_dev_reset(struct device *dev) } EXPORT_SYMBOL_GPL(cdx_dev_reset); =20 +/** + * 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 =3D to_cdx_device(dev); + u8 bus_num =3D *((u8 *)data); + + if (cdx_dev->bus_num =3D=3D bus_num) + return cdx_dev_reset(dev); + + return 0; +} + /** * cdx_unregister_device - Unregister a CDX device * @dev: CDX device @@ -517,10 +537,31 @@ static ssize_t rescan_store(const struct bus_type *bu= s, } static BUS_ATTR_WO(rescan); =20 +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 =3D BUS_ID(bus_id); + mutex_lock(&cdx_controller_lock); + /* Reset all the devices attached to cdx bus */ + ret =3D 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 =3D __ATTR(reset, 0200, NULL, + bus_reset_store); + static struct attribute *cdx_bus_attrs[] =3D { &bus_attr_enable.attr, &bus_attr_disable.attr, &bus_attr_rescan.attr, + &bus_attr_reset.attr, NULL, }; ATTRIBUTE_GROUPS(cdx_bus); --=20 2.25.1