diff options
Diffstat (limited to 'drivers/dax/hmem/device.c')
| -rw-r--r-- | drivers/dax/hmem/device.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/dax/hmem/device.c b/drivers/dax/hmem/device.c index b9dd6b27745c..cb6401c9e9a4 100644 --- a/drivers/dax/hmem/device.c +++ b/drivers/dax/hmem/device.c @@ -5,6 +5,9 @@ #include <linux/dax.h> #include <linux/mm.h> +static bool nohmem; +module_param_named(disable, nohmem, bool, 0444); + void hmem_register_device(int target_nid, struct resource *r) { /* define a clean / non-busy resource for the platform device */ @@ -17,6 +20,9 @@ void hmem_register_device(int target_nid, struct resource *r) struct memregion_info info; int rc, id; + if (nohmem) + return; + rc = region_intersects(res.start, resource_size(&res), IORESOURCE_MEM, IORES_DESC_SOFT_RESERVED); if (rc != REGION_INTERSECTS) @@ -63,3 +69,32 @@ out_resource: out_pdev: memregion_free(id); } + +static __init int hmem_register_one(struct resource *res, void *data) +{ + /* + * If the resource is not a top-level resource it was already + * assigned to a device by the HMAT parsing. + */ + if (res->parent != &iomem_resource) { + pr_info("HMEM: skip %pr, already claimed\n", res); + return 0; + } + + hmem_register_device(phys_to_target_node(res->start), res); + + return 0; +} + +static __init int hmem_init(void) +{ + walk_iomem_res_desc(IORES_DESC_SOFT_RESERVED, + IORESOURCE_MEM, 0, -1, NULL, hmem_register_one); + return 0; +} + +/* + * As this is a fallback for address ranges unclaimed by the ACPI HMAT + * parsing it must be at an initcall level greater than hmat_init(). + */ +late_initcall(hmem_init); |