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cxl/core: Emit modalias for CXL devices

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In order to enable libkmod lookups for CXL device objects to their
corresponding module, add 'modalias' to the base attribute of CXL
devices.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Ben Widawsky <ben.widawsky@intel.com>
Link: https://lore.kernel.org/r/164298424120.3018233.15611905873808708542.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2022-01-23 16:30:41 -08:00
parent d17d0540a0
commit 83fbdbe4c1
2 changed files with 26 additions and 9 deletions
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9
Documentation/ABI/testing/sysfs-bus-cxl
View File

@ -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: linux-cxl@vger.kernel.org
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

26
drivers/cxl/core/port.c
View File

@ -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,
};
@ -855,15 +872,6 @@ 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,