In order to enable libkmod lookups for CXL device objects to their corresponding module, add 'modalias' to the base attribute of CXL devices.
Signed-off-by: Dan Williams <[email protected]> --- Documentation/ABI/testing/sysfs-bus-cxl | 9 +++++++++ drivers/cxl/core/port.c | 26 +++++++++++++++++--------- 2 files changed, 26 insertions(+), 9 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl index 0b6a2e6e8fbb..6d8cbf3355b5 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -34,6 +34,15 @@ Description: the same value communicated in the DEVTYPE environment variable for uevents for devices on the "cxl" bus. +What: /sys/bus/cxl/devices/*/modalias +Date: December, 2021 +KernelVersion: v5.18 +Contact: [email protected] +Description: + CXL device objects export the modalias attribute which mirrors + the same value communicated in the MODALIAS environment variable + for uevents for devices on the "cxl" bus. + What: /sys/bus/cxl/devices/portX/uport Date: June, 2021 KernelVersion: v5.14 diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 72633865b386..eede0bbe687a 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -34,8 +34,25 @@ static ssize_t devtype_show(struct device *dev, struct device_attribute *attr, } static DEVICE_ATTR_RO(devtype); +static int cxl_device_id(struct device *dev) +{ + if (dev->type == &cxl_nvdimm_bridge_type) + return CXL_DEVICE_NVDIMM_BRIDGE; + if (dev->type == &cxl_nvdimm_type) + return CXL_DEVICE_NVDIMM; + return 0; +} + +static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + return sysfs_emit(buf, CXL_MODALIAS_FMT "\n", cxl_device_id(dev)); +} +static DEVICE_ATTR_RO(modalias); + static struct attribute *cxl_base_attributes[] = { &dev_attr_devtype.attr, + &dev_attr_modalias.attr, NULL, }; @@ -845,15 +862,6 @@ void cxl_driver_unregister(struct cxl_driver *cxl_drv) } EXPORT_SYMBOL_NS_GPL(cxl_driver_unregister, CXL); -static int cxl_device_id(struct device *dev) -{ - if (dev->type == &cxl_nvdimm_bridge_type) - return CXL_DEVICE_NVDIMM_BRIDGE; - if (dev->type == &cxl_nvdimm_type) - return CXL_DEVICE_NVDIMM; - return 0; -} - static int cxl_bus_uevent(struct device *dev, struct kobj_uevent_env *env) { return add_uevent_var(env, "MODALIAS=" CXL_MODALIAS_FMT,
