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13 Commits

Author SHA1 Message Date
Mike Rapoport (Microsoft)
9fac145b6d mm, arch: consolidate hugetlb CMA reservation 
Every architecture that supports hugetlb_cma command line parameter
reserves CMA areas for hugetlb during setup_arch().

This obfuscates the ordering of hugetlb CMA initialization with respect to
the rest initialization of the core MM.

Introduce arch_hugetlb_cma_order() callback to allow architectures report
the desired order-per-bit of CMA areas and provide a week implementation
of arch_hugetlb_cma_order() for architectures that don't support hugetlb
with CMA.

Use this callback in hugetlb_cma_reserve() instead if passing the order as
parameter and call hugetlb_cma_reserve() from mm_core_init_early() rather
than have it spread over architecture specific code.

Link: https://lkml.kernel.org/r/20260111082105.290734-28-rppt@kernel.org
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alex Shi <alexs@kernel.org>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: "Borislav Petkov (AMD)" <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Klara Modin <klarasmodin@gmail.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Magnus Lindholm <linmag7@gmail.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Pratyush Yadav <pratyush@kernel.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: "Ritesh Harjani (IBM)" <ritesh.list@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2026-01-26 20:02:19 -08:00
Nai-Chen Cheng
7d14230db8 Documentation: fix typo in CXL driver documentation 
Fix typo 'enumates' to 'enumerate' in CXL driver operation
documentation to improve readability.

Signed-off-by: Nai-Chen Cheng <bleach1827@gmail.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Reviewed-by: Li Ming <ming.li@zohomail.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20250610173152.33566-1-bleach1827@gmail.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-06-30 16:36:06 -07:00
Dave Jiang
fc78561595 cxl: doc/linux/access-coordinates Update access coordinates calculation methods 
Add documentation on how to calculate the access coordinates for a given
CXL region in detail.

Reviewed-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Link: https://patch.msgid.link/20250515000923.2590820-4-dave.jiang@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-15 16:39:13 -07:00
Alison Schofield
d542461211 cxl: Sync up the driver-api/cxl documentation 
pmem.c regs.c mbox.c identifiers were missing. Add them to
memory-devices.rst following their respective DOC comment includes.

Two acpi.c identifiers were available, but not used in kernel-doc's:
1) Add add_cxl_resources to memory-devices.rst and fix up the Sphinx
complaint on the ascii art by escaping it.
2) Add cxl_acpi_evaluate_qtg_dsm to access-coordinates.rst.

core/features.c is new. Add a "DOC: cxl features" comment to the
source and identifiers to memory_devices.rst.

Signed-off-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Link: https://patch.msgid.link/20250513215813.1419645-1-alison.schofield@intel.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 15:12:15 -07:00
Gregory Price
dba600d0f2 cxl: docs - add self-referencing cross-links 
Add some crosslinks between pages in the CXL docs - mostly to the
ACPI tables.

Suggested-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Gregory Price <gourry@gourry.net>
Link: https://patch.msgid.link/20250512162134.3596150-18-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:46 -07:00
Gregory Price
641fdea6b9 cxl: docs/linux/memory-hotplug 
Add documentation on how the CXL driver surfaces memory through the
DAX driver and memory-hotplug.

Signed-off-by: Gregory Price <gourry@gourry.net>
Link: https://patch.msgid.link/20250512162134.3596150-13-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:45 -07:00
Gregory Price
36e9f71bd6 cxl: docs/linux/dax-driver documentation 
Add documentation on how the CXL driver interacts with the DAX driver.

Signed-off-by: Gregory Price <gourry@gourry.net>
Link: https://patch.msgid.link/20250512162134.3596150-12-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:45 -07:00
Gregory Price
ef3a43a691 cxl: docs/linux/cxl-driver - add example configurations 
Add 4 example configurations:
- single device
- cross-host-bridge interleave
- intra-host-bridge-interleave
- multi-level interleave

Signed-off-by: Gregory Price <gourry@gourry.net>
Link: https://patch.msgid.link/20250512162134.3596150-11-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:45 -07:00
Gregory Price
2e2865a1d0 cxl: docs/linux - add cxl-driver theory of operation 
Add docs for the CXL driver that explains the base devices,
decoder types, region types, mailbox interfaces, and decoder
programming.

Signed-off-by: Gregory Price <gourry@gourry.net>
Link: https://patch.msgid.link/20250512162134.3596150-10-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:45 -07:00
Gregory Price
bef826ead3 cxl: docs/linux - early boot configuration 
Document __init time configurations that affect CXL driver probe
process and memory region configuration.

Signed-off-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20250512162134.3596150-9-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:45 -07:00
Gregory Price
9bd8546e59 cxl: docs/linux - overview 
Add type-3 device configuration overview that explains the probe
process for a type-3 device from early-boot through memory-hotplug.

Signed-off-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20250512162134.3596150-8-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:45 -07:00
Gregory Price
a3bf6b417b cxl: docs - access-coordinates doc fixups 
Place the hierarchy diagram in access-coordinates.rst in a code block.

Fix a few grammar issues.

Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Suggested-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20250512162134.3596150-3-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:44 -07:00
Gregory Price
a770647294 cxl: update documentation structure in prep for new docs 
Restructure the cxl folder to make adding docs per-page cleaner.

Signed-off-by: Gregory Price <gourry@gourry.net>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Link: https://patch.msgid.link/20250512162134.3596150-2-gourry@gourry.net
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
 2025-05-13 13:07:44 -07:00