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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jan 2023 13:42:50.7936 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 674cfb48-c378-46b2-2cfa-08daf890ba2b 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: DM6NAM11FT067.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4061 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1755277510000757447?= X-GMAIL-MSGID: =?utf-8?q?1755277510000757447?= 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 --- Documentation/ABI/testing/sysfs-bus-cdx | 34 +++++ drivers/bus/cdx/cdx.c | 144 ++++++++++++++++++++ drivers/bus/cdx/controller/cdx_controller.c | 19 +++ drivers/bus/cdx/controller/mcdi_functions.c | 14 ++ drivers/bus/cdx/controller/mcdi_functions.h | 11 ++ include/linux/cdx/cdx_bus.h | 23 ++++ 6 files changed, 245 insertions(+) diff --git a/Documentation/ABI/testing/sysfs-bus-cdx b/Documentation/ABI/testing/sysfs-bus-cdx index 8c2425fdb6d9..1e0fdce18cde 100644 --- a/Documentation/ABI/testing/sysfs-bus-cdx +++ b/Documentation/ABI/testing/sysfs-bus-cdx @@ -10,3 +10,37 @@ Description: For example:: # echo 1 > /sys/bus/cdx/rescan + +What: /sys/bus/cdx/devices/.../vendor +Date: January 2023 +Contact: nipun.gupta@amd.com +Description: + Vendor ID for this CDX device + +What: /sys/bus/cdx/devices/.../device +Date: January 2023 +Contact: nipun.gupta@amd.com +Description: + Device ID for this CDX device + +What: /sys/bus/cdx/devices/.../reset +Date: January 2023 +Contact: nipun.gupta@amd.com +Description: + Writing a non-zero value to this file would reset the + CDX device + + For example:: + + # echo 1 > /sys/bus/cdx/.../reset + +What: /sys/bus/cdx/devices/.../remove +Date: January 2023 +Contact: tarak.reddy@amd.com +Description: + Writing a non-zero value to this file would remove the + corrosponding device from the CDX bus + + For example:: + + # echo 1 > /sys/bus/cdx/devices/.../remove diff --git a/drivers/bus/cdx/cdx.c b/drivers/bus/cdx/cdx.c index 2737470f08d3..1372d8dcaa4c 100644 --- a/drivers/bus/cdx/cdx.c +++ b/drivers/bus/cdx/cdx.c @@ -72,6 +72,38 @@ static DECLARE_BITMAP(cdx_controller_id_map, MAX_CDX_CONTROLLERS); /* List of CDX controllers registered with the CDX bus */ static LIST_HEAD(cdx_controllers); +/** + * reset_cdx_device - Reset a CDX device + * @dev: CDX device + * @data: This is always passed as NULL, and is not used in this API, + * but is required here as the bus_for_each_dev() API expects + * the passed function (reset_cdx_device) to have this + * as an argument. + * + * @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); + struct cdx_controller *cdx = cdx_dev->cdx; + struct cdx_device_config dev_config; + int ret; + + 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"); + + return ret; +} + +int cdx_dev_reset(struct device *dev) +{ + return reset_cdx_device(dev, NULL); +} +EXPORT_SYMBOL_GPL(cdx_dev_reset); + /** * cdx_unregister_device - Unregister a CDX device * @dev: CDX device @@ -238,6 +270,117 @@ 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 = reset_cdx_device(dev, NULL); + 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 +423,7 @@ 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/bus/cdx/controller/cdx_controller.c b/drivers/bus/cdx/controller/cdx_controller.c index b62a6d3b7bd4..dbcd236b360d 100644 --- a/drivers/bus/cdx/controller/cdx_controller.c +++ b/drivers/bus/cdx/controller/cdx_controller.c @@ -85,6 +85,24 @@ 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; @@ -144,6 +162,7 @@ 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/bus/cdx/controller/mcdi_functions.c b/drivers/bus/cdx/controller/mcdi_functions.c index 3940a2c7919c..673b3896411e 100644 --- a/drivers/bus/cdx/controller/mcdi_functions.c +++ b/drivers/bus/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/bus/cdx/controller/mcdi_functions.h b/drivers/bus/cdx/controller/mcdi_functions.h index 97dfde18592f..54d6017ab7d1 100644 --- a/drivers/bus/cdx/controller/mcdi_functions.h +++ b/drivers/bus/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 1d28f11da5e7..9f055739ed30 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; }; /** @@ -150,4 +165,12 @@ 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_ */