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dax: Track all dax_region allocations under a global resource tree

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Introduce a global "DAX Regions" resource root and register each
dax_region->res under it via request_resource(). Release the resource on
dax_region teardown.

By enforcing a single global namespace for dax_region allocations, this
ensures only one of dax_hmem or dax_cxl can successfully register a
dax_region for a given range.

Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Smita Koralahalli <Smita.KoralahalliChannabasappa@amd.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20260322195343.206900-7-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:
Smita Koralahalli 2026-03-22 19:53:39 +00:00 committed by Dave Jiang
parent 39aa1d4be1
commit 34f80bb969
1 changed files with 17 additions and 3 deletions
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20
drivers/dax/bus.c
View File

@ -10,6 +10,7 @@
#include "dax-private.h"
#include "bus.h"
static struct resource dax_regions = DEFINE_RES_MEM_NAMED(0, -1, "DAX Regions");
static DEFINE_MUTEX(dax_bus_lock);
/*
@ -627,6 +628,7 @@ static void dax_region_unregister(void *region)
sysfs_remove_groups(&dax_region->dev->kobj,
dax_region_attribute_groups);
release_resource(&dax_region->res);
dax_region_put(dax_region);
}
@ -635,6 +637,7 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
unsigned long flags)
{
struct dax_region *dax_region;
int rc;
/*
* The DAX core assumes that it can store its private data in
@ -667,14 +670,25 @@ struct dax_region *alloc_dax_region(struct device *parent, int region_id,
.flags = IORESOURCE_MEM | flags,
};
if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups)) {
dax_region_put(dax_region);
return NULL;
rc = request_resource(&dax_regions, &dax_region->res);
if (rc) {
dev_dbg(parent, "dax_region resource conflict for %pR\n",
&dax_region->res);
goto err_res;
}
if (sysfs_create_groups(&parent->kobj, dax_region_attribute_groups))
goto err_sysfs;
if (devm_add_action_or_reset(parent, dax_region_unregister, dax_region))
return NULL;
return dax_region;
err_sysfs:
release_resource(&dax_region->res);
err_res:
dax_region_put(dax_region);
return NULL;
}
EXPORT_SYMBOL_GPL(alloc_dax_region);