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authorDan Williams <dan.j.williams@intel.com>2017-07-12 17:58:21 -0700
committerDan Williams <dan.j.williams@intel.com>2019-01-06 21:24:46 -0800
commit9567da0b408a2553d32ca83cba4f1fc5a8aad459 (patch)
treeb381bc4c908be5e14d4653f698515725b12ae806 /drivers/dax/bus.h
parent51cf784c42d07fbd62cb604836a9270cf3361509 (diff)
downloadlinux-9567da0b408a2553d32ca83cba4f1fc5a8aad459.tar.bz2
device-dax: Introduce bus + driver model
In support of multiple device-dax instances per device-dax-region and allowing the 'kmem' driver to attach to dax-instances instead of the current device-node access, convert the dax sub-system from a class to a bus. Recall that the kmem driver takes reserved / special purpose memories and assigns them to be managed by the core-mm. Aside from the fact the device-dax instances are registered and probed on a bus, two other lifetime-management changes are made: 1/ Delay attaching a cdev until driver probe time 2/ A new run_dax() helper is introduced to allow restoring dax-operation after a kill_dax() event. So, at driver ->probe() time we run_dax() and at ->remove() time we kill_dax() and invalidate all mappings. Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax/bus.h')
-rw-r--r--drivers/dax/bus.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/dax/bus.h b/drivers/dax/bus.h
index 840865aa69e8..ea509504df3a 100644
--- a/drivers/dax/bus.h
+++ b/drivers/dax/bus.h
@@ -11,5 +11,21 @@ void dax_region_put(struct dax_region *dax_region);
struct dax_region *alloc_dax_region(struct device *parent, int region_id,
struct resource *res, unsigned int align, unsigned long flags);
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region, int id);
+int __dax_driver_register(struct device_driver *drv,
+ struct module *module, const char *mod_name);
+#define dax_driver_register(driver) \
+ __dax_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
void kill_dev_dax(struct dev_dax *dev_dax);
+
+/*
+ * While run_dax() is potentially a generic operation that could be
+ * defined in include/linux/dax.h we don't want to grow any users
+ * outside of drivers/dax/
+ */
+void run_dax(struct dax_device *dax_dev);
+
+#define MODULE_ALIAS_DAX_DEVICE(type) \
+ MODULE_ALIAS("dax:t" __stringify(type) "*")
+#define DAX_DEVICE_MODALIAS_FMT "dax:t%d"
+
#endif /* __DAX_BUS_H__ */