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1b5695b024
The x86 implementation of range-to-target_node lookup (i.e. phys_to_target_node() and memory_add_physaddr_to_nid()) relies on numa_memblks. Since numa_memblks are now part of the generic code, move these functions from x86 to mm/numa_memblks.c and select CONFIG_NUMA_KEEP_MEMINFO when CONFIG_NUMA_MEMBLKS=y for dax and cxl. [rppt@kernel.org: fix build] Link: https://lkml.kernel.org/r/ZtVfSt_zloPdDqVB@kernel.org Link: https://lkml.kernel.org/r/20240807064110.1003856-26-rppt@kernel.org Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Tested-by: Zi Yan <ziy@nvidia.com> # for x86_64 and arm64 Tested-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> [arm64 + CXL via QEMU] Reviewed-by: Dan Williams <dan.j.williams@intel.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Andreas Larsson <andreas@gaisler.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: David S. Miller <davem@davemloft.net> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jiaxun Yang <jiaxun.yang@flygoat.com> Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Rafael J. Wysocki <rafael@kernel.org> Cc: Rob Herring (Arm) <robh@kernel.org> Cc: Samuel Holland <samuel.holland@sifive.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
82 lines
2.9 KiB
Plaintext
82 lines
2.9 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menuconfig DAX
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tristate "DAX: direct access to differentiated memory"
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default m if NVDIMM_DAX
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if DAX
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config DEV_DAX
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tristate "Device DAX: direct access mapping device"
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depends on TRANSPARENT_HUGEPAGE
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help
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Support raw access to differentiated (persistence, bandwidth,
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latency...) memory via an mmap(2) capable character
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device. Platform firmware or a device driver may identify a
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platform memory resource that is differentiated from the
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baseline memory pool. Mappings of a /dev/daxX.Y device impose
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restrictions that make the mapping behavior deterministic.
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config DEV_DAX_PMEM
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tristate "PMEM DAX: direct access to persistent memory"
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depends on LIBNVDIMM && NVDIMM_DAX && DEV_DAX
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default DEV_DAX
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help
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Support raw access to persistent memory. Note that this
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driver consumes memory ranges allocated and exported by the
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libnvdimm sub-system.
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Say M if unsure
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config DEV_DAX_HMEM
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tristate "HMEM DAX: direct access to 'specific purpose' memory"
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depends on EFI_SOFT_RESERVE
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select NUMA_KEEP_MEMINFO if NUMA_MEMBLKS
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default DEV_DAX
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help
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EFI 2.8 platforms, and others, may advertise 'specific purpose'
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memory. For example, a high bandwidth memory pool. The
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indication from platform firmware is meant to reserve the
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memory from typical usage by default. This driver creates
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device-dax instances for these memory ranges, and that also
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enables the possibility to assign them to the DEV_DAX_KMEM
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driver to override the reservation and add them to kernel
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"System RAM" pool.
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Say M if unsure.
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config DEV_DAX_CXL
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tristate "CXL DAX: direct access to CXL RAM regions"
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depends on CXL_BUS && CXL_REGION && DEV_DAX
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default CXL_REGION && DEV_DAX
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help
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CXL RAM regions are either mapped by platform-firmware
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and published in the initial system-memory map as "System RAM", mapped
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by platform-firmware as "Soft Reserved", or dynamically provisioned
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after boot by the CXL driver. In the latter two cases a device-dax
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instance is created to access that unmapped-by-default address range.
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Per usual it can remain as dedicated access via a device interface, or
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converted to "System RAM" via the dax_kmem facility.
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config DEV_DAX_HMEM_DEVICES
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depends on DEV_DAX_HMEM && DAX
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def_bool y
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config DEV_DAX_KMEM
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tristate "KMEM DAX: map dax-devices as System-RAM"
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default DEV_DAX
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depends on DEV_DAX
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depends on MEMORY_HOTPLUG # for add_memory() and friends
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help
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Support access to persistent, or other performance
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differentiated memory as if it were System RAM. This allows
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easier use of persistent memory by unmodified applications, or
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adds core kernel memory services to heterogeneous memory types
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(HMEM) marked "reserved" by platform firmware.
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To use this feature, a DAX device must be unbound from the
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device_dax driver and bound to this kmem driver on each boot.
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Say N if unsure.
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endif
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