Introduce dax_cxl_mode to coordinate between dax_cxl and dax_hmem when handling CXL tagged memory ranges.
This patch defines the dax_cxl_mode enum and establishes a default policy. Subsequent patches will wire this into dax_cxl and dax_hmem to decide whether CXL tagged memory ranges should be deferred, registered or dropped. No functional changes. Signed-off-by: Smita Koralahalli <[email protected]> --- drivers/dax/bus.c | 3 +++ drivers/dax/bus.h | 8 ++++++++ 2 files changed, 11 insertions(+) diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c index fde29e0ad68b..72bc5b76f061 100644 --- a/drivers/dax/bus.c +++ b/drivers/dax/bus.c @@ -24,6 +24,9 @@ DECLARE_RWSEM(dax_region_rwsem); */ DECLARE_RWSEM(dax_dev_rwsem); +enum dax_cxl_mode dax_cxl_mode = DAX_CXL_MODE_DEFER; +EXPORT_SYMBOL_GPL(dax_cxl_mode); + #define DAX_NAME_LEN 30 struct dax_id { struct list_head list; diff --git a/drivers/dax/bus.h b/drivers/dax/bus.h index cbbf64443098..a40cbbf1e26b 100644 --- a/drivers/dax/bus.h +++ b/drivers/dax/bus.h @@ -41,6 +41,14 @@ struct dax_device_driver { void (*remove)(struct dev_dax *dev); }; +enum dax_cxl_mode { + DAX_CXL_MODE_DEFER, + DAX_CXL_MODE_REGISTER, + DAX_CXL_MODE_DROP, +}; + +extern enum dax_cxl_mode dax_cxl_mode; + int __dax_driver_register(struct dax_device_driver *dax_drv, struct module *module, const char *mod_name); #define dax_driver_register(driver) \ -- 2.17.1
