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| author | Dan Williams <dan.j.williams@intel.com> | 2017-07-12 17:58:21 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2019-01-06 21:24:46 -0800 |
| commit | 9567da0b408a2553d32ca83cba4f1fc5a8aad459 (patch) | |
| tree | b381bc4c908be5e14d4653f698515725b12ae806 /drivers/dax/bus.h | |
| parent | 51cf784c42d07fbd62cb604836a9270cf3361509 (diff) | |
| download | linux-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.h | 16 |
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__ */ |