• Dan Williams's avatar
    ACPI: HMAT: attach a device for each soft-reserved range · 5ccac54f
    Dan Williams authored
    The hmem enabling in commit cf8741ac ("ACPI: NUMA: HMAT: Register
    "soft reserved" memory as an "hmem" device") only registered ranges to the
    hmem driver for each soft-reservation that also appeared in the HMAT.
    While this is meant to encourage platform firmware to "do the right thing"
    and publish an HMAT, the corollary is that platforms that fail to publish
    an accurate HMAT will strand memory from Linux usage.  Additionally, the
    "efi_fake_mem" kernel command line option enabling will strand memory by
    default without an HMAT.
    
    Arrange for "soft reserved" memory that goes unclaimed by HMAT entries to
    be published as raw resource ranges for the hmem driver to consume.
    
    Include a module parameter to disable either this fallback behavior, or
    the hmat enabling from creating hmem devices.  The module parameter
    requires the hmem device enabling to have unique name in the module
    namespace: "device_hmem".
    
    The driver depends on the architecture providing phys_to_target_node()
    which is only x86 via numa_meminfo() and arm64 via a generic memblock
    implementation.
    
    [joao.m.martins@oracle.com: require NUMA_KEEP_MEMINFO for phys_to_target_node()]
      Link: https://lkml.kernel.org/r/aaae71a7-4846-f5cc-5acf-cf05fdb1f2dc@oracle.comSigned-off-by: default avatarDan Williams <dan.j.williams@intel.com>
    Signed-off-by: default avatarJoao Martins <joao.m.martins@oracle.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Reviewed-by: default avatarJoao Martins <joao.m.martins@oracle.com>
    Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
    Cc: Brice Goglin <Brice.Goglin@inria.fr>
    Cc: Jeff Moyer <jmoyer@redhat.com>
    Cc: Catalin Marinas <catalin.marinas@arm.com>
    Cc: Will Deacon <will@kernel.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Ard Biesheuvel <ardb@kernel.org>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Ben Skeggs <bskeggs@redhat.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Daniel Vetter <daniel@ffwll.ch>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: Dave Jiang <dave.jiang@intel.com>
    Cc: David Airlie <airlied@linux.ie>
    Cc: David Hildenbrand <david@redhat.com>
    Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Ira Weiny <ira.weiny@intel.com>
    Cc: Jason Gunthorpe <jgg@mellanox.com>
    Cc: Jia He <justin.he@arm.com>
    Cc: Michael Ellerman <mpe@ellerman.id.au>
    Cc: Mike Rapoport <rppt@linux.ibm.com>
    Cc: Paul Mackerras <paulus@ozlabs.org>
    Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Tom Lendacky <thomas.lendacky@amd.com>
    Cc: Vishal Verma <vishal.l.verma@intel.com>
    Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
    Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
    Cc: Bjorn Helgaas <bhelgaas@google.com>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Hulk Robot <hulkci@huawei.com>
    Cc: Jason Yan <yanaijie@huawei.com>
    Cc: "Jérôme Glisse" <jglisse@redhat.com>
    Cc: Juergen Gross <jgross@suse.com>
    Cc: kernel test robot <lkp@intel.com>
    Cc: Randy Dunlap <rdunlap@infradead.org>
    Cc: Stefano Stabellini <sstabellini@kernel.org>
    Cc: Vivek Goyal <vgoyal@redhat.com>
    Link: https://lkml.kernel.org/r/159643098298.4062302.17587338161136144730.stgit@dwillia2-desk3.amr.corp.intel.comSigned-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    5ccac54f
device.c 2.27 KB