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dax/cxl, hmem: Initialize hmem early and defer dax_cxl binding

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Move hmem/ earlier in the dax Makefile so that hmem_init() runs before
dax_cxl.

In addition, defer registration of the dax_cxl driver to a workqueue
instead of using module_cxl_driver(). This ensures that dax_hmem has
an opportunity to initialize and register its deferred callback and make
ownership decisions before dax_cxl begins probing and claiming Soft
Reserved ranges.

Mark the dax_cxl driver as PROBE_PREFER_ASYNCHRONOUS so its probe runs
out of line from other synchronous probing avoiding ordering
dependencies while coordinating ownership decisions with dax_hmem.

Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Tested-by: Tomasz Wolski <tomasz.wolski@fujitsu.com>
Link: https://patch.msgid.link/20260322195343.206900-6-Smita.KoralahalliChannabasappa@amd.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Dan Williams 2026-03-22 19:53:38 +00:00 committed by Dave Jiang
parent edfcf1e21e
commit 39aa1d4be1
2 changed files with 27 additions and 3 deletions
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3
drivers/dax/Makefile
View File

@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
obj-y += hmem/
obj-$(CONFIG_DAX) += dax.o
obj-$(CONFIG_DEV_DAX) += device_dax.o
obj-$(CONFIG_DEV_DAX_KMEM) += kmem.o
@ -10,5 +11,3 @@ dax-y += bus.o
device_dax-y := device.o
dax_pmem-y := pmem.o
dax_cxl-y := cxl.o
obj-y += hmem/

27
drivers/dax/cxl.c
View File

@ -38,10 +38,35 @@ static struct cxl_driver cxl_dax_region_driver = {
.id = CXL_DEVICE_DAX_REGION,
.drv = {
.suppress_bind_attrs = true,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
module_cxl_driver(cxl_dax_region_driver);
static void cxl_dax_region_driver_register(struct work_struct *work)
{
cxl_driver_register(&cxl_dax_region_driver);
}
static DECLARE_WORK(cxl_dax_region_driver_work, cxl_dax_region_driver_register);
static int __init cxl_dax_region_init(void)
{
/*
* Need to resolve a race with dax_hmem wanting to drive regions
* instead of CXL
*/
queue_work(system_long_wq, &cxl_dax_region_driver_work);
return 0;
}
module_init(cxl_dax_region_init);
static void __exit cxl_dax_region_exit(void)
{
flush_work(&cxl_dax_region_driver_work);
cxl_driver_unregister(&cxl_dax_region_driver);
}
module_exit(cxl_dax_region_exit);
MODULE_ALIAS_CXL(CXL_DEVICE_DAX_REGION);
MODULE_DESCRIPTION("CXL DAX: direct access to CXL regions");
MODULE_LICENSE("GPL");