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charset="utf-8" Reworked from a patch by Alison Schofield Reintroduce Soft Reserved range into the iomem_resource tree for HMEM to consume. This restores visibility in /proc/iomem for ranges actively in use, while avoiding the early-boot conflicts that occurred when Soft Reserved was published into iomem before CXL window and region discovery. Link: https://lore.kernel.org/linux-cxl/29312c0765224ae76862d59a17748c8188f= b95f1.1692638817.git.alison.schofield@intel.com/ Co-developed-by: Alison Schofield Signed-off-by: Alison Schofield Co-developed-by: Zhijian Li Signed-off-by: Zhijian Li Signed-off-by: Smita Koralahalli Reviewed-by: Dave Jiang Reviewed-by: Jonathan Cameron Reviewed-by: Dan Williams --- drivers/dax/hmem/hmem.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index 85854e25254b..c07bf5fe833d 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -59,6 +59,34 @@ static void release_hmem(void *pdev) platform_device_unregister(pdev); } =20 +static void remove_soft_reserved(void *r) +{ + remove_resource(r); + kfree(r); +} + +static int add_soft_reserve_into_iomem(struct device *host, + const struct resource *res) +{ + int rc; + + struct resource *soft __free(kfree) =3D + kmalloc(sizeof(*res), GFP_KERNEL); + if (!soft) + return -ENOMEM; + + *soft =3D DEFINE_RES_NAMED_DESC(res->start, (res->end - res->start + 1), + "Soft Reserved", IORESOURCE_MEM, + IORES_DESC_SOFT_RESERVED); + + rc =3D insert_resource(&iomem_resource, soft); + if (rc) + return rc; + + return devm_add_action_or_reset(host, remove_soft_reserved, + no_free_ptr(soft)); +} + static int hmem_register_device(struct device *host, int target_nid, const struct resource *res) { @@ -88,7 +116,9 @@ static int hmem_register_device(struct device *host, int= target_nid, if (rc !=3D REGION_INTERSECTS) return 0; =20 - /* TODO: Add Soft-Reserved memory back to iomem */ + rc =3D add_soft_reserve_into_iomem(host, res); + if (rc) + return rc; =20 id =3D memregion_alloc(GFP_KERNEL); if (id < 0) { --=20 2.17.1