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dax/hmem: Move hmem device registration to dax_hmem.ko

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In preparation for the CXL region driver to take over the responsibility
of registering device-dax instances for CXL regions, move the
registration of "hmem" devices to dax_hmem.ko.

Previously the builtin component of this enabling
(drivers/dax/hmem/device.o) would register platform devices for each
address range and trigger the dax_hmem.ko module to load and attach
device-dax instances to those devices. Now, the ranges are collected
from the HMAT and EFI memory map walking, but the device creation is
deferred. A new "hmem_platform" device is created which triggers
dax_hmem.ko to load and register the platform devices.

Tested-by: Fan Ni <fan.ni@samsung.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/167602002771.1924368.5653558226424530127.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2023-02-10 01:07:07 -08:00
parent fe098574a9
commit 7dab174e2e
5 changed files with 157 additions and 54 deletions
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include/linux/dax.h
+5 -2
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@@ -262,11 +262,14 @@ static inline bool dax_mapping(struct address_space *mapping)
}
#ifdef CONFIG_DEV_DAX_HMEM_DEVICES
void hmem_register_device(int target_nid, struct resource *r);
void hmem_register_resource(int target_nid, struct resource *r);
#else
static inline void hmem_register_device(int target_nid, struct resource *r)
static inline void hmem_register_resource(int target_nid, struct resource *r)
{
}
#endif
typedef int (*walk_hmem_fn)(struct device *dev, int target_nid,
const struct resource *res);
int walk_hmem_resources(struct device *dev, walk_hmem_fn fn);
#endif