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authorDan Williams <dan.j.williams@intel.com>2021-06-09 19:01:35 +0300
committerDan Williams <dan.j.williams@intel.com>2021-06-10 04:02:38 +0300
commit4812be97c015bddf12c70155858df43acc35a4eb (patch)
tree5a00c36e1983f4b00bf38ef391f3d6d0d3a26b6c /drivers/cxl/Makefile
parent54ada34b4dfdb864ac602e13ff87581abe517ce9 (diff)
downloadlinux-4812be97c015bddf12c70155858df43acc35a4eb.tar.xz
cxl/acpi: Introduce the root of a cxl_port topology
While CXL builds upon the PCI software model for enumeration and endpoint control, a static platform component is required to bootstrap the CXL memory layout. Similar to how ACPI identifies root-level PCI memory resources, ACPI data enumerates the address space and interleave configuration for CXL Memory. In addition to identifying host bridges, ACPI is responsible for enumerating the CXL memory space that can be addressed by downstream decoders. This is similar to the requirement for ACPI to publish resources via the _CRS method for PCI host bridges. Specifically, ACPI publishes a table, CXL Early Discovery Table (CEDT), which includes a list of CXL Memory resources, CXL Fixed Memory Window Structures (CFMWS). For now, introduce the core infrastructure for a cxl_port hierarchy starting with a root level anchor represented by the ACPI0017 device. Follow on changes model support for the configurable decode capabilities of cxl_port instances, i.e. CXL switch support. Co-developed-by: Alison Schofield <alison.schofield@intel.com> Signed-off-by: Alison Schofield <alison.schofield@intel.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/162325449515.2293126.15303270193010154608.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/Makefile')
-rw-r--r--drivers/cxl/Makefile2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/cxl/Makefile b/drivers/cxl/Makefile
index d9d282dc15be..a29efb3e8ad2 100644
--- a/drivers/cxl/Makefile
+++ b/drivers/cxl/Makefile
@@ -1,7 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_CXL_BUS) += cxl_core.o
obj-$(CONFIG_CXL_MEM) += cxl_pci.o
+obj-$(CONFIG_CXL_ACPI) += cxl_acpi.o
ccflags-y += -DDEFAULT_SYMBOL_NAMESPACE=CXL
cxl_core-y := core.o
cxl_pci-y := pci.o
+cxl_acpi-y := acpi.o