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authorDan Williams <dan.j.williams@intel.com>2021-06-16 02:18:11 +0300
committerDan Williams <dan.j.williams@intel.com>2021-06-16 02:46:34 +0300
commit6af7139c979474a29a6ad642c9bf32d92e24c5bc (patch)
tree8e971a9c4b6f2475858c80d5d0902a92994e680d /drivers/cxl/cxl.h
parent87815ee9d0060a91bdf18266e42837a9adb5972e (diff)
downloadlinux-6af7139c979474a29a6ad642c9bf32d92e24c5bc.tar.xz
cxl/core: Add cxl-bus driver infrastructure
Enable devices on the 'cxl' bus to be attached to drivers. The initial user of this functionality is a driver for an 'nvdimm-bridge' device that anchors a libnvdimm hierarchy attached to CXL persistent memory resources. Other device types that will leverage this include: cxl_port: map and use component register functionality (HDM Decoders) cxl_nvdimm: translate CXL memory expander endpoints to libnvdimm 'nvdimm' objects cxl_region: translate CXL interleave sets to libnvdimm 'region' objects The pairing of devices to drivers is handled through the cxl_device_id() matching to cxl_driver.id values. A cxl_device_id() of '0' indicates no driver support. In addition to ->match(), ->probe(), and ->remove() support for the 'cxl' bus introduce MODULE_ALIAS_CXL() to autoload modules containing cxl-drivers. Drivers are added in follow-on changes. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/162379909190.2993820.6134168109678004186.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/cxl.h')
-rw-r--r--drivers/cxl/cxl.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 97a273ae3947..a6f8e7097ea2 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -268,4 +268,26 @@ devm_cxl_add_passthrough_decoder(struct device *host, struct cxl_port *port)
}
extern struct bus_type cxl_bus_type;
+
+struct cxl_driver {
+ const char *name;
+ int (*probe)(struct device *dev);
+ void (*remove)(struct device *dev);
+ struct device_driver drv;
+ int id;
+};
+
+static inline struct cxl_driver *to_cxl_drv(struct device_driver *drv)
+{
+ return container_of(drv, struct cxl_driver, drv);
+}
+
+int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner,
+ const char *modname);
+#define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME)
+void cxl_driver_unregister(struct cxl_driver *cxl_drv);
+
+#define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*")
+#define CXL_MODALIAS_FMT "cxl:t%d"
+
#endif /* __CXL_H__ */