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Wed, 23 Jul 2025 16:13:56 +0000 From: Date: Wed, 23 Jul 2025 09:13:54 -0700 To: , Smita Koralahalli , , , , , CC: Davidlohr Bueso , Jonathan Cameron , Dave Jiang , "Alison Schofield" , Vishal Verma , Ira Weiny , Dan Williams , Matthew Wilcox , Jan Kara , "Rafael J . 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Then that is something like the below, only lightly tested > and likely regresses the non-CXL case. > > -- 8< -- > From 48b25461eca050504cf5678afd7837307b2dd14f Mon Sep 17 00:00:00 2001 > From: Dan Williams > Date: Tue, 22 Jul 2025 16:11:08 -0700 > Subject: [RFC PATCH] dax/cxl: Defer Soft Reserved registration Likely needs this incremental change to prevent DEV_DAX_HMEM from being built-in when CXL is not. This still leaves the awkward scenario of CXL enabled, DEV_DAX_CXL disabled, and DEV_DAX_HMEM built-in. I believe that safely fails in devdax only / fallback mode, but something to investigate when respinning on top of this. -- 8< -- diff --git a/drivers/dax/Kconfig b/drivers/dax/Kconfig index d656e4c0eb84..3683bb3f2311 100644 --- a/drivers/dax/Kconfig +++ b/drivers/dax/Kconfig @@ -48,6 +48,8 @@ config DEV_DAX_CXL tristate "CXL DAX: direct access to CXL RAM regions" depends on CXL_BUS && CXL_REGION && DEV_DAX default CXL_REGION && DEV_DAX + depends on CXL_ACPI >= DEV_DAX_HMEM + depends on CXL_PCI >= DEV_DAX_HMEM help CXL RAM regions are either mapped by platform-firmware and published in the initial system-memory map as "System RAM", mapped diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c index 0916478e3817..8bcd104111a8 100644 --- a/drivers/dax/hmem/hmem.c +++ b/drivers/dax/hmem/hmem.c @@ -103,7 +103,7 @@ static int hmem_register_device(struct device *host, int target_nid, long id; int rc; - if (IS_ENABLED(CONFIG_CXL_REGION) && + if (IS_ENABLED(CONFIG_DEV_DAX_CXL) && region_intersects(res->start, resource_size(res), IORESOURCE_MEM, IORES_DESC_CXL) != REGION_DISJOINT) { switch (dax_cxl_mode) { @@ -209,7 +209,7 @@ static __init int dax_hmem_init(void) * CXL topology discovery at least once before scanning the * iomem resource tree for IORES_DESC_CXL resources. */ - if (IS_ENABLED(CONFIG_CXL_REGION)) { + if (IS_ENABLED(CONFIG_DEV_DAX_CXL)) { request_module("cxl_acpi"); request_module("cxl_pci"); }