diff options
Diffstat (limited to 'drivers/cxl/Kconfig')
| -rw-r--r-- | drivers/cxl/Kconfig | 58 |
1 files changed, 47 insertions, 11 deletions
diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig index e6de221cc568..768ced3d6fe8 100644 --- a/drivers/cxl/Kconfig +++ b/drivers/cxl/Kconfig @@ -2,6 +2,7 @@ menuconfig CXL_BUS tristate "CXL (Compute Express Link) Devices Support" depends on PCI + select PCI_DOE help CXL is a bus that is electrically compatible with PCI Express, but layers three protocols on that signalling (CXL.io, CXL.cache, and @@ -13,25 +14,26 @@ menuconfig CXL_BUS if CXL_BUS -config CXL_MEM - tristate "CXL.mem: Memory Devices" +config CXL_PCI + tristate "PCI manageability" default CXL_BUS help - The CXL.mem protocol allows a device to act as a provider of - "System RAM" and/or "Persistent Memory" that is fully coherent - as if the memory was attached to the typical CPU memory - controller. + The CXL specification defines a "CXL memory device" sub-class in the + PCI "memory controller" base class of devices. Device's identified by + this class code provide support for volatile and / or persistent + memory to be mapped into the system address map (Host-managed Device + Memory (HDM)). - Say 'y/m' to enable a driver that will attach to CXL.mem devices for - configuration and management primarily via the mailbox interface. See - Chapter 2.3 Type 3 CXL Device in the CXL 2.0 specification for more - details. + Say 'y/m' to enable a driver that will attach to CXL memory expander + devices enumerated by the memory device class code for configuration + and management primarily via the mailbox interface. See Chapter 2.3 + Type 3 CXL Device in the CXL 2.0 specification for more details. If unsure say 'm'. config CXL_MEM_RAW_COMMANDS bool "RAW Command Interface for Memory Devices" - depends on CXL_MEM + depends on CXL_PCI help Enable CXL RAW command interface. @@ -51,6 +53,7 @@ config CXL_ACPI tristate "CXL ACPI: Platform Support" depends on ACPI default CXL_BUS + select ACPI_TABLE_LIB help Enable support for host managed device memory (HDM) resources published by a platform's ACPI CXL memory layout description. See @@ -75,4 +78,37 @@ config CXL_PMEM provisioning the persistent memory capacity of CXL memory expanders. If unsure say 'm'. + +config CXL_MEM + tristate "CXL: Memory Expansion" + depends on CXL_PCI + default CXL_BUS + help + The CXL.mem protocol allows a device to act as a provider of "System + RAM" and/or "Persistent Memory" that is fully coherent as if the + memory were attached to the typical CPU memory controller. This is + known as HDM "Host-managed Device Memory". + + Say 'y/m' to enable a driver that will attach to CXL.mem devices for + memory expansion and control of HDM. See Chapter 9.13 in the CXL 2.0 + specification for a detailed description of HDM. + + If unsure say 'm'. + +config CXL_PORT + default CXL_BUS + tristate + +config CXL_SUSPEND + def_bool y + depends on SUSPEND && CXL_MEM + +config CXL_REGION + bool + default CXL_BUS + # For MAX_PHYSMEM_BITS + depends on SPARSEMEM + select MEMREGION + select GET_FREE_REGION + endif |