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device-dax: Add support for a dax override driver

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Introduce the 'new_id' concept for enabling a custom device-driver attach
policy for dax-bus drivers. The intended use is to have a mechanism for
hot-plugging device-dax ranges into the page allocator on-demand. With
this in place the default policy of using device-dax for performance
differentiated memory can be overridden by user-space policy that can
arrange for the memory range to be managed as 'System RAM' with
user-defined NUMA and other performance attributes.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2018-11-07 15:31:23 -08:00
parent 89ec9f2cfa
commit d200781ef2
3 changed files with 156 additions and 10 deletions
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11
drivers/dax/device.c
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@@ -504,9 +504,12 @@ static int dev_dax_remove(struct device *dev)
return 0;
}
static struct device_driver device_dax_driver = {
.probe = dev_dax_probe,
.remove = dev_dax_remove,
static struct dax_device_driver device_dax_driver = {
.drv = {
.probe = dev_dax_probe,
.remove = dev_dax_remove,
},
.match_always = 1,
};
static int __init dax_init(void)
@@ -516,7 +519,7 @@ static int __init dax_init(void)
static void __exit dax_exit(void)
{
driver_unregister(&device_dax_driver);
dax_driver_unregister(&device_dax_driver);
}
MODULE_AUTHOR("Intel Corporation");