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![Dan Williams](/assets/img/avatar_default.png)
In preparation for attaching a platform device per iomem resource teach the efi_fake_mem code to create an e820 entry per instance. Similar to E820_TYPE_PRAM, bypass merging resource when the e820 map is sanitized. Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Acked-by: Ard Biesheuvel <ardb@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Ben Skeggs <bskeggs@redhat.com> Cc: Brice Goglin <Brice.Goglin@inria.fr> Cc: Catalin Marinas <catalin.marinas@arm.com> 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: Ira Weiny <ira.weiny@intel.com> Cc: Jason Gunthorpe <jgg@mellanox.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Jia He <justin.he@arm.com> Cc: Joao Martins <joao.m.martins@oracle.com> Cc: Jonathan Cameron <Jonathan.Cameron@huawei.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: Tom Lendacky <thomas.lendacky@amd.com> Cc: Vishal Verma <vishal.l.verma@intel.com> Cc: Wei Yang <richard.weiyang@linux.alibaba.com> Cc: Will Deacon <will@kernel.org> 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/159643096068.4062302.11590041070221681669.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright(c) 2019 Intel Corporation. All rights reserved. */
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#include <linux/efi.h>
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#include <asm/e820/api.h>
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#include "fake_mem.h"
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void __init efi_fake_memmap_early(void)
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{
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int i;
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/*
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* The late efi_fake_mem() call can handle all requests if
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* EFI_MEMORY_SP support is disabled.
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*/
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if (!efi_soft_reserve_enabled())
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return;
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if (!efi_enabled(EFI_MEMMAP) || !nr_fake_mem)
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return;
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/*
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* Given that efi_fake_memmap() needs to perform memblock
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* allocations it needs to run after e820__memblock_setup().
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* However, if efi_fake_mem specifies EFI_MEMORY_SP for a given
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* address range that potentially needs to mark the memory as
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* reserved prior to e820__memblock_setup(). Update e820
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* directly if EFI_MEMORY_SP is specified for an
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* EFI_CONVENTIONAL_MEMORY descriptor.
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*/
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for (i = 0; i < nr_fake_mem; i++) {
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struct efi_mem_range *mem = &efi_fake_mems[i];
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efi_memory_desc_t *md;
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u64 m_start, m_end;
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if ((mem->attribute & EFI_MEMORY_SP) == 0)
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continue;
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m_start = mem->range.start;
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m_end = mem->range.end;
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for_each_efi_memory_desc(md) {
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u64 start, end, size;
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if (md->type != EFI_CONVENTIONAL_MEMORY)
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continue;
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start = md->phys_addr;
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end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) - 1;
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if (m_start <= end && m_end >= start)
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/* fake range overlaps descriptor */;
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else
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continue;
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/*
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* Trim the boundary of the e820 update to the
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* descriptor in case the fake range overlaps
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* !EFI_CONVENTIONAL_MEMORY
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*/
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start = max(start, m_start);
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end = min(end, m_end);
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size = end - start + 1;
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if (end <= start)
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continue;
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/*
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* Ensure each efi_fake_mem instance results in
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* a unique e820 resource
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*/
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e820__range_remove(start, size, E820_TYPE_RAM, 1);
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e820__range_add(start, size, E820_TYPE_SOFT_RESERVED);
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e820__update_table(e820_table);
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}
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}
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}
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