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Fri, 17 Feb 2023 05:29:44 -0800 Received: from xhdipdslab49.xilinx.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server id 15.1.2375.34 via Frontend Transport; Fri, 17 Feb 2023 07:29:35 -0600 From: Nipun Gupta To: , , , , , , , , , , , , , , , , , , , , , , , , , , , CC: , , , , , Nipun Gupta Subject: [PATCH v8 7/7] cdx: add device attributes Date: Fri, 17 Feb 2023 18:58:30 +0530 Message-ID: <20230217132830.3140439-8-nipun.gupta@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230217132830.3140439-1-nipun.gupta@amd.com> References: <20230217132830.3140439-1-nipun.gupta@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT095:EE_|SN7PR12MB6743:EE_ X-MS-Office365-Filtering-Correlation-Id: 558f4d61-6005-4ae7-75f9-08db10eb093d 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:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230025)(4636009)(376002)(136003)(39860400002)(346002)(396003)(451199018)(40470700004)(46966006)(36840700001)(81166007)(47076005)(86362001)(2616005)(336012)(426003)(83380400001)(5660300002)(41300700001)(36860700001)(30864003)(44832011)(40480700001)(36756003)(70206006)(70586007)(4326008)(82310400005)(8676002)(110136005)(316002)(54906003)(40460700003)(478600001)(7416002)(8936002)(2906002)(921005)(356005)(26005)(82740400003)(1076003)(186003)(6666004)(83996005)(36900700001)(2101003);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Feb 2023 13:29:46.0032 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 558f4d61-6005-4ae7-75f9-08db10eb093d 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT095.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6743 Precedence: bulk List-ID: X-Mailing-List: linux-kbuild@vger.kernel.org Create sysfs entry for CDX devices. Sysfs entries provided in each of the CDX device detected by the CDX controller - vendor id - device id - remove - reset of the device. - driver override Signed-off-by: Puneet Gupta Signed-off-by: Nipun Gupta Signed-off-by: Tarak Reddy Tested-by: Nikhil Agarwal --- Documentation/ABI/testing/sysfs-bus-cdx | 44 +++++++ drivers/cdx/cdx.c | 145 ++++++++++++++++++++++++ drivers/cdx/controller/cdx_controller.c | 19 ++++ drivers/cdx/controller/mcdi_functions.c | 14 +++ drivers/cdx/controller/mcdi_functions.h | 11 ++ include/linux/cdx/cdx_bus.h | 27 +++++ 6 files changed, 260 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-cdx b/Documentation/ABI/testing/sysfs-bus-cdx index b55248964c9a..ca5a4394286e 100644 --- a/Documentation/ABI/testing/sysfs-bus-cdx +++ b/Documentation/ABI/testing/sysfs-bus-cdx @@ -10,3 +10,47 @@ Description: For example:: # echo 1 > /sys/bus/cdx/rescan + +What: /sys/bus/cdx/devices/.../vendor +Date: February 2023 +Contact: nipun.gupta@amd.com +Description: + Vendor ID for this CDX device. Vendor ID is 16 bit + identifier which is specific to the device manufacturer. + Combination of Vendor ID and Device ID identifies a device. + +What: /sys/bus/cdx/devices/.../device +Date: February 2023 +Contact: nipun.gupta@amd.com +Description: + Device ID for this CDX device. Device ID is a 16 bit + identifier to identify a device type within the range + of a device manufacturer. + Combination of Vendor ID and Device ID identifies a device. + +What: /sys/bus/cdx/devices/.../reset +Date: February 2023 +Contact: nipun.gupta@amd.com +Description: + Writing a non-zero value to this file resets the CDX device. + On resetting the device, the corresponding driver is notified + twice, once before the device is being reset, and again after + the reset has been complete. + + For example:: + + # echo 1 > /sys/bus/cdx/.../reset + +What: /sys/bus/cdx/devices/.../remove +Date: February 2023 +Contact: tarak.reddy@amd.com +Description: + Writing a non-zero value to this file removes the corresponding + device from the CDX bus. If the device is to be reconfigured + reconfigured in the Hardware, the device can be removed, so + that the device driver does not access the device while it is + being reconfigured. + + For example:: + + # echo 1 > /sys/bus/cdx/devices/.../remove diff --git a/drivers/cdx/cdx.c b/drivers/cdx/cdx.c index 795770522b01..a5b79e04a8d3 100644 --- a/drivers/cdx/cdx.c +++ b/drivers/cdx/cdx.c @@ -72,6 +72,39 @@ /* CDX controllers registered with the CDX bus */ static DEFINE_XARRAY_ALLOC(cdx_controllers); +/** + * cdx_dev_reset - Reset a CDX device + * @dev: CDX device + * + * Return: -errno on failure, 0 on success. + */ +int cdx_dev_reset(struct device *dev) +{ + struct cdx_device *cdx_dev = to_cdx_device(dev); + struct cdx_controller *cdx = cdx_dev->cdx; + struct cdx_device_config dev_config; + struct cdx_driver *cdx_drv; + int ret; + + cdx_drv = to_cdx_driver(dev->driver); + /* Notify driver that device is being reset */ + if (cdx_drv && cdx_drv->reset_prepare) + cdx_drv->reset_prepare(cdx_dev); + + dev_config.type = CDX_DEV_RESET_CONF; + ret = cdx->ops->dev_configure(cdx, cdx_dev->bus_num, + cdx_dev->dev_num, &dev_config); + if (ret) + dev_err(dev, "cdx device reset failed\n"); + + /* Notify driver that device reset is complete */ + if (cdx_drv && cdx_drv->reset_done) + cdx_drv->reset_done(cdx_dev); + + return ret; +} +EXPORT_SYMBOL_GPL(cdx_dev_reset); + /** * cdx_unregister_device - Unregister a CDX device * @dev: CDX device @@ -238,6 +271,117 @@ static int cdx_dma_configure(struct device *dev) return 0; } +/* show configuration fields */ +#define cdx_config_attr(field, format_string) \ +static ssize_t \ +field##_show(struct device *dev, struct device_attribute *attr, char *buf) \ +{ \ + struct cdx_device *cdx_dev = to_cdx_device(dev); \ + return sysfs_emit(buf, format_string, cdx_dev->field); \ +} \ +static DEVICE_ATTR_RO(field) + +cdx_config_attr(vendor, "0x%04x\n"); +cdx_config_attr(device, "0x%04x\n"); + +static ssize_t remove_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long val = 0; + + if (kstrtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (!val) + return -EINVAL; + + if (device_remove_file_self(dev, attr)) { + int ret; + + ret = cdx_unregister_device(dev, NULL); + if (ret) + return ret; + } + + return count; +} +static DEVICE_ATTR_WO(remove); + +static ssize_t reset_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long val = 0; + int ret = 0; + + if (kstrtoul(buf, 0, &val) < 0) + return -EINVAL; + + if (!val) + return -EINVAL; + + ret = cdx_dev_reset(dev); + if (ret) + return ret; + + return count; +} +static DEVICE_ATTR_WO(reset); + +static ssize_t driver_override_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct cdx_device *cdx_dev = to_cdx_device(dev); + const char *old = cdx_dev->driver_override; + char *driver_override; + char *cp; + + if (WARN_ON(dev->bus != &cdx_bus_type)) + return -EINVAL; + + if (count >= (PAGE_SIZE - 1)) + return -EINVAL; + + driver_override = kstrndup(buf, count, GFP_KERNEL); + if (!driver_override) + return -ENOMEM; + + cp = strchr(driver_override, '\n'); + if (cp) + *cp = '\0'; + + if (strlen(driver_override)) { + cdx_dev->driver_override = driver_override; + } else { + kfree(driver_override); + cdx_dev->driver_override = NULL; + } + + kfree(old); + + return count; +} + +static ssize_t driver_override_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct cdx_device *cdx_dev = to_cdx_device(dev); + + return sysfs_emit(buf, "%s\n", cdx_dev->driver_override); +} +static DEVICE_ATTR_RW(driver_override); + +static struct attribute *cdx_dev_attrs[] = { + &dev_attr_remove.attr, + &dev_attr_reset.attr, + &dev_attr_vendor.attr, + &dev_attr_device.attr, + &dev_attr_driver_override.attr, + NULL, +}; +ATTRIBUTE_GROUPS(cdx_dev); + static ssize_t rescan_store(struct bus_type *bus, const char *buf, size_t count) { @@ -280,6 +424,7 @@ struct bus_type cdx_bus_type = { .shutdown = cdx_shutdown, .dma_configure = cdx_dma_configure, .bus_groups = cdx_bus_groups, + .dev_groups = cdx_dev_groups, }; EXPORT_SYMBOL_GPL(cdx_bus_type); diff --git a/drivers/cdx/controller/cdx_controller.c b/drivers/cdx/controller/cdx_controller.c index c40027cc38aa..e442ea9d0b32 100644 --- a/drivers/cdx/controller/cdx_controller.c +++ b/drivers/cdx/controller/cdx_controller.c @@ -44,6 +44,24 @@ void cdx_rpmsg_pre_remove(struct cdx_controller *cdx) cdx_mcdi_wait_for_quiescence(cdx->priv, MCDI_RPC_TIMEOUT); } +static int cdx_configure_device(struct cdx_controller *cdx, + u8 bus_num, u8 dev_num, + struct cdx_device_config *dev_config) +{ + int ret = 0; + + switch (dev_config->type) { + case CDX_DEV_RESET_CONF: + ret = cdx_mcdi_reset_device(cdx->priv, bus_num, dev_num); + break; + default: + dev_err(cdx->dev, "Invalid device configuration flag\n"); + ret = -EINVAL; + } + + return ret; +} + static int cdx_scan_devices(struct cdx_controller *cdx) { struct cdx_mcdi *cdx_mcdi = cdx->priv; @@ -103,6 +121,7 @@ static int cdx_scan_devices(struct cdx_controller *cdx) static struct cdx_ops cdx_ops = { .scan = cdx_scan_devices, + .dev_configure = cdx_configure_device, }; static int xlnx_cdx_probe(struct platform_device *pdev) diff --git a/drivers/cdx/controller/mcdi_functions.c b/drivers/cdx/controller/mcdi_functions.c index 3940a2c7919c..673b3896411e 100644 --- a/drivers/cdx/controller/mcdi_functions.c +++ b/drivers/cdx/controller/mcdi_functions.c @@ -123,3 +123,17 @@ int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx, return 0; } + +int cdx_mcdi_reset_device(struct cdx_mcdi *cdx, u8 bus_num, u8 dev_num) +{ + MCDI_DECLARE_BUF(inbuf, MC_CMD_CDX_DEVICE_RESET_IN_LEN); + int rc; + + MCDI_SET_DWORD(inbuf, CDX_DEVICE_RESET_IN_BUS, bus_num); + MCDI_SET_DWORD(inbuf, CDX_DEVICE_RESET_IN_DEVICE, dev_num); + + rc = cdx_mcdi_rpc(cdx, MC_CMD_CDX_DEVICE_RESET, inbuf, sizeof(inbuf), + NULL, 0, NULL); + + return rc; +} diff --git a/drivers/cdx/controller/mcdi_functions.h b/drivers/cdx/controller/mcdi_functions.h index 6bf5a4a0778f..7440ace5539a 100644 --- a/drivers/cdx/controller/mcdi_functions.h +++ b/drivers/cdx/controller/mcdi_functions.h @@ -47,4 +47,15 @@ int cdx_mcdi_get_dev_config(struct cdx_mcdi *cdx, u8 bus_num, u8 dev_num, struct cdx_dev_params *dev_params); +/** + * cdx_mcdi_reset_device - Reset cdx device represented by bus_num:dev_num + * @cdx: pointer to MCDI interface. + * @bus_num: Bus number. + * @dev_num: Device number. + * + * Return: 0 on success, <0 on failure + */ +int cdx_mcdi_reset_device(struct cdx_mcdi *cdx, + u8 bus_num, u8 dev_num); + #endif /* CDX_MCDI_FUNCTIONS_H */ diff --git a/include/linux/cdx/cdx_bus.h b/include/linux/cdx/cdx_bus.h index d134e0104724..35ef41d8a61a 100644 --- a/include/linux/cdx/cdx_bus.h +++ b/include/linux/cdx/cdx_bus.h @@ -21,8 +21,20 @@ /* Forward declaration for CDX controller */ struct cdx_controller; +enum { + CDX_DEV_RESET_CONF, +}; + +struct cdx_device_config { + u8 type; +}; + typedef int (*cdx_scan_cb)(struct cdx_controller *cdx); +typedef int (*cdx_dev_configure_cb)(struct cdx_controller *cdx, + u8 bus_num, u8 dev_num, + struct cdx_device_config *dev_config); + /** * CDX_DEVICE_DRIVER_OVERRIDE - macro used to describe a CDX device with * override_only flags. @@ -39,9 +51,12 @@ typedef int (*cdx_scan_cb)(struct cdx_controller *cdx); /** * struct cdx_ops - Callbacks supported by CDX controller. * @scan: scan the devices on the controller + * @dev_configure: configuration like reset, master_enable, + * msi_config etc for a CDX device */ struct cdx_ops { cdx_scan_cb scan; + cdx_dev_configure_cb dev_configure; }; /** @@ -101,6 +116,8 @@ struct cdx_device { * @probe: Function called when a device is added * @remove: Function called when a device is removed * @shutdown: Function called at shutdown time to quiesce the device + * @reset_prepare: Function called before is reset to notify driver + * @reset_done: Function called after reset is complete to notify driver * @driver_managed_dma: Device driver doesn't use kernel DMA API for DMA. * For most device drivers, no need to care about this flag * as long as all DMAs are handled through the kernel DMA API. @@ -115,6 +132,8 @@ struct cdx_driver { int (*probe)(struct cdx_device *dev); int (*remove)(struct cdx_device *dev); void (*shutdown)(struct cdx_device *dev); + void (*reset_prepare)(struct cdx_device *dev); + void (*reset_done)(struct cdx_device *dev); bool driver_managed_dma; }; @@ -144,4 +163,12 @@ void cdx_driver_unregister(struct cdx_driver *cdx_driver); extern struct bus_type cdx_bus_type; +/** + * cdx_dev_reset - Reset CDX device + * @dev: device pointer + * + * Return: 0 for success, -errno on failure + */ +int cdx_dev_reset(struct device *dev); + #endif /* _CDX_BUS_H_ */