mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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2e6bd221d9
Kernels built with CONFIG_PPC_EARLY_DEBUG_OPAL enabled expects r8 & r9 to be filled with OPAL base & entry addresses respectively. Setting these registers allows the kernel to perform OPAL calls before the device tree is parsed. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Reviewed-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/159602303975.575379.5032301944162937479.stgit@hbathini
1120 lines
30 KiB
C
1120 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* ppc64 code to implement the kexec_file_load syscall
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*
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* Copyright (C) 2004 Adam Litke (agl@us.ibm.com)
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* Copyright (C) 2004 IBM Corp.
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* Copyright (C) 2004,2005 Milton D Miller II, IBM Corporation
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* Copyright (C) 2005 R Sharada (sharada@in.ibm.com)
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* Copyright (C) 2006 Mohan Kumar M (mohan@in.ibm.com)
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* Copyright (C) 2020 IBM Corporation
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*
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* Based on kexec-tools' kexec-ppc64.c, kexec-elf-rel-ppc64.c, fs2dt.c.
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* Heavily modified for the kernel by
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* Hari Bathini, IBM Corporation.
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*/
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#include <linux/kexec.h>
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#include <linux/of_fdt.h>
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#include <linux/libfdt.h>
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#include <linux/of_device.h>
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#include <linux/memblock.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <asm/drmem.h>
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#include <asm/kexec_ranges.h>
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#include <asm/crashdump-ppc64.h>
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struct umem_info {
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u64 *buf; /* data buffer for usable-memory property */
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u32 size; /* size allocated for the data buffer */
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u32 max_entries; /* maximum no. of entries */
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u32 idx; /* index of current entry */
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/* usable memory ranges to look up */
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unsigned int nr_ranges;
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const struct crash_mem_range *ranges;
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};
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const struct kexec_file_ops * const kexec_file_loaders[] = {
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&kexec_elf64_ops,
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NULL
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};
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/**
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* get_exclude_memory_ranges - Get exclude memory ranges. This list includes
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* regions like opal/rtas, tce-table, initrd,
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* kernel, htab which should be avoided while
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* setting up kexec load segments.
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* @mem_ranges: Range list to add the memory ranges to.
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*
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* Returns 0 on success, negative errno on error.
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*/
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static int get_exclude_memory_ranges(struct crash_mem **mem_ranges)
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{
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int ret;
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ret = add_tce_mem_ranges(mem_ranges);
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if (ret)
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goto out;
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ret = add_initrd_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_htab_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_kernel_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_rtas_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_opal_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_reserved_mem_ranges(mem_ranges);
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if (ret)
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goto out;
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/* exclude memory ranges should be sorted for easy lookup */
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sort_memory_ranges(*mem_ranges, true);
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out:
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if (ret)
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pr_err("Failed to setup exclude memory ranges\n");
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return ret;
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}
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/**
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* get_usable_memory_ranges - Get usable memory ranges. This list includes
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* regions like crashkernel, opal/rtas & tce-table,
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* that kdump kernel could use.
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* @mem_ranges: Range list to add the memory ranges to.
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*
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* Returns 0 on success, negative errno on error.
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*/
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static int get_usable_memory_ranges(struct crash_mem **mem_ranges)
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{
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int ret;
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/*
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* Early boot failure observed on guests when low memory (first memory
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* block?) is not added to usable memory. So, add [0, crashk_res.end]
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* instead of [crashk_res.start, crashk_res.end] to workaround it.
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* Also, crashed kernel's memory must be added to reserve map to
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* avoid kdump kernel from using it.
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*/
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ret = add_mem_range(mem_ranges, 0, crashk_res.end + 1);
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if (ret)
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goto out;
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ret = add_rtas_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_opal_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_tce_mem_ranges(mem_ranges);
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out:
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if (ret)
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pr_err("Failed to setup usable memory ranges\n");
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return ret;
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}
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/**
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* get_crash_memory_ranges - Get crash memory ranges. This list includes
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* first/crashing kernel's memory regions that
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* would be exported via an elfcore.
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* @mem_ranges: Range list to add the memory ranges to.
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*
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* Returns 0 on success, negative errno on error.
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*/
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static int get_crash_memory_ranges(struct crash_mem **mem_ranges)
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{
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struct memblock_region *reg;
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struct crash_mem *tmem;
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int ret;
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for_each_memblock(memory, reg) {
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u64 base, size;
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base = (u64)reg->base;
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size = (u64)reg->size;
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/* Skip backup memory region, which needs a separate entry */
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if (base == BACKUP_SRC_START) {
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if (size > BACKUP_SRC_SIZE) {
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base = BACKUP_SRC_END + 1;
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size -= BACKUP_SRC_SIZE;
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} else
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continue;
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}
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ret = add_mem_range(mem_ranges, base, size);
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if (ret)
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goto out;
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/* Try merging adjacent ranges before reallocation attempt */
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if ((*mem_ranges)->nr_ranges == (*mem_ranges)->max_nr_ranges)
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sort_memory_ranges(*mem_ranges, true);
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}
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/* Reallocate memory ranges if there is no space to split ranges */
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tmem = *mem_ranges;
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if (tmem && (tmem->nr_ranges == tmem->max_nr_ranges)) {
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tmem = realloc_mem_ranges(mem_ranges);
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if (!tmem)
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goto out;
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}
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/* Exclude crashkernel region */
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ret = crash_exclude_mem_range(tmem, crashk_res.start, crashk_res.end);
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if (ret)
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goto out;
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/*
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* FIXME: For now, stay in parity with kexec-tools but if RTAS/OPAL
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* regions are exported to save their context at the time of
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* crash, they should actually be backed up just like the
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* first 64K bytes of memory.
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*/
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ret = add_rtas_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_opal_mem_range(mem_ranges);
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if (ret)
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goto out;
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/* create a separate program header for the backup region */
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ret = add_mem_range(mem_ranges, BACKUP_SRC_START, BACKUP_SRC_SIZE);
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if (ret)
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goto out;
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sort_memory_ranges(*mem_ranges, false);
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out:
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if (ret)
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pr_err("Failed to setup crash memory ranges\n");
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return ret;
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}
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/**
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* get_reserved_memory_ranges - Get reserve memory ranges. This list includes
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* memory regions that should be added to the
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* memory reserve map to ensure the region is
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* protected from any mischief.
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* @mem_ranges: Range list to add the memory ranges to.
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*
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* Returns 0 on success, negative errno on error.
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*/
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static int get_reserved_memory_ranges(struct crash_mem **mem_ranges)
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{
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int ret;
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ret = add_rtas_mem_range(mem_ranges);
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if (ret)
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goto out;
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ret = add_tce_mem_ranges(mem_ranges);
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if (ret)
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goto out;
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ret = add_reserved_mem_ranges(mem_ranges);
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out:
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if (ret)
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pr_err("Failed to setup reserved memory ranges\n");
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return ret;
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}
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/**
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* __locate_mem_hole_top_down - Looks top down for a large enough memory hole
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* in the memory regions between buf_min & buf_max
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* for the buffer. If found, sets kbuf->mem.
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* @kbuf: Buffer contents and memory parameters.
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* @buf_min: Minimum address for the buffer.
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* @buf_max: Maximum address for the buffer.
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*
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* Returns 0 on success, negative errno on error.
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*/
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static int __locate_mem_hole_top_down(struct kexec_buf *kbuf,
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u64 buf_min, u64 buf_max)
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{
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int ret = -EADDRNOTAVAIL;
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phys_addr_t start, end;
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u64 i;
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for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE,
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MEMBLOCK_NONE, &start, &end, NULL) {
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/*
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* memblock uses [start, end) convention while it is
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* [start, end] here. Fix the off-by-one to have the
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* same convention.
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*/
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end -= 1;
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if (start > buf_max)
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continue;
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/* Memory hole not found */
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if (end < buf_min)
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break;
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/* Adjust memory region based on the given range */
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if (start < buf_min)
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start = buf_min;
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if (end > buf_max)
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end = buf_max;
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start = ALIGN(start, kbuf->buf_align);
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if (start < end && (end - start + 1) >= kbuf->memsz) {
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/* Suitable memory range found. Set kbuf->mem */
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kbuf->mem = ALIGN_DOWN(end - kbuf->memsz + 1,
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kbuf->buf_align);
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ret = 0;
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break;
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}
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}
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return ret;
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}
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/**
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* locate_mem_hole_top_down_ppc64 - Skip special memory regions to find a
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* suitable buffer with top down approach.
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* @kbuf: Buffer contents and memory parameters.
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* @buf_min: Minimum address for the buffer.
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* @buf_max: Maximum address for the buffer.
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* @emem: Exclude memory ranges.
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*
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* Returns 0 on success, negative errno on error.
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*/
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static int locate_mem_hole_top_down_ppc64(struct kexec_buf *kbuf,
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u64 buf_min, u64 buf_max,
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const struct crash_mem *emem)
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{
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int i, ret = 0, err = -EADDRNOTAVAIL;
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u64 start, end, tmin, tmax;
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tmax = buf_max;
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for (i = (emem->nr_ranges - 1); i >= 0; i--) {
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start = emem->ranges[i].start;
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end = emem->ranges[i].end;
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if (start > tmax)
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continue;
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if (end < tmax) {
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tmin = (end < buf_min ? buf_min : end + 1);
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ret = __locate_mem_hole_top_down(kbuf, tmin, tmax);
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if (!ret)
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return 0;
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}
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tmax = start - 1;
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if (tmax < buf_min) {
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ret = err;
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break;
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}
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ret = 0;
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}
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if (!ret) {
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tmin = buf_min;
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ret = __locate_mem_hole_top_down(kbuf, tmin, tmax);
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}
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return ret;
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}
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/**
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* __locate_mem_hole_bottom_up - Looks bottom up for a large enough memory hole
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* in the memory regions between buf_min & buf_max
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* for the buffer. If found, sets kbuf->mem.
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* @kbuf: Buffer contents and memory parameters.
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* @buf_min: Minimum address for the buffer.
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* @buf_max: Maximum address for the buffer.
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*
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* Returns 0 on success, negative errno on error.
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*/
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static int __locate_mem_hole_bottom_up(struct kexec_buf *kbuf,
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u64 buf_min, u64 buf_max)
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{
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int ret = -EADDRNOTAVAIL;
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phys_addr_t start, end;
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u64 i;
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for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE,
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MEMBLOCK_NONE, &start, &end, NULL) {
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/*
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* memblock uses [start, end) convention while it is
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* [start, end] here. Fix the off-by-one to have the
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* same convention.
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*/
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end -= 1;
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if (end < buf_min)
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continue;
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/* Memory hole not found */
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if (start > buf_max)
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break;
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/* Adjust memory region based on the given range */
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if (start < buf_min)
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start = buf_min;
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if (end > buf_max)
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end = buf_max;
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start = ALIGN(start, kbuf->buf_align);
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if (start < end && (end - start + 1) >= kbuf->memsz) {
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/* Suitable memory range found. Set kbuf->mem */
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kbuf->mem = start;
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ret = 0;
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break;
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}
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}
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return ret;
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}
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/**
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* locate_mem_hole_bottom_up_ppc64 - Skip special memory regions to find a
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* suitable buffer with bottom up approach.
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* @kbuf: Buffer contents and memory parameters.
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* @buf_min: Minimum address for the buffer.
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* @buf_max: Maximum address for the buffer.
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* @emem: Exclude memory ranges.
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*
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* Returns 0 on success, negative errno on error.
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*/
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static int locate_mem_hole_bottom_up_ppc64(struct kexec_buf *kbuf,
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u64 buf_min, u64 buf_max,
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const struct crash_mem *emem)
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{
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int i, ret = 0, err = -EADDRNOTAVAIL;
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u64 start, end, tmin, tmax;
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tmin = buf_min;
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for (i = 0; i < emem->nr_ranges; i++) {
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start = emem->ranges[i].start;
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end = emem->ranges[i].end;
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if (end < tmin)
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continue;
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if (start > tmin) {
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tmax = (start > buf_max ? buf_max : start - 1);
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ret = __locate_mem_hole_bottom_up(kbuf, tmin, tmax);
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if (!ret)
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return 0;
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}
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tmin = end + 1;
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if (tmin > buf_max) {
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ret = err;
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break;
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}
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ret = 0;
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}
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if (!ret) {
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tmax = buf_max;
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ret = __locate_mem_hole_bottom_up(kbuf, tmin, tmax);
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}
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return ret;
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}
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/**
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* check_realloc_usable_mem - Reallocate buffer if it can't accommodate entries
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* @um_info: Usable memory buffer and ranges info.
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* @cnt: No. of entries to accommodate.
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*
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* Frees up the old buffer if memory reallocation fails.
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*
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* Returns buffer on success, NULL on error.
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*/
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static u64 *check_realloc_usable_mem(struct umem_info *um_info, int cnt)
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{
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u32 new_size;
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u64 *tbuf;
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|
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if ((um_info->idx + cnt) <= um_info->max_entries)
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return um_info->buf;
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new_size = um_info->size + MEM_RANGE_CHUNK_SZ;
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tbuf = krealloc(um_info->buf, new_size, GFP_KERNEL);
|
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if (tbuf) {
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um_info->buf = tbuf;
|
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um_info->size = new_size;
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um_info->max_entries = (um_info->size / sizeof(u64));
|
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}
|
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|
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return tbuf;
|
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}
|
|
|
|
/**
|
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* add_usable_mem - Add the usable memory ranges within the given memory range
|
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* to the buffer
|
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* @um_info: Usable memory buffer and ranges info.
|
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* @base: Base address of memory range to look for.
|
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* @end: End address of memory range to look for.
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*
|
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* Returns 0 on success, negative errno on error.
|
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*/
|
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static int add_usable_mem(struct umem_info *um_info, u64 base, u64 end)
|
|
{
|
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u64 loc_base, loc_end;
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bool add;
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int i;
|
|
|
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for (i = 0; i < um_info->nr_ranges; i++) {
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add = false;
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loc_base = um_info->ranges[i].start;
|
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loc_end = um_info->ranges[i].end;
|
|
if (loc_base >= base && loc_end <= end)
|
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add = true;
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else if (base < loc_end && end > loc_base) {
|
|
if (loc_base < base)
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loc_base = base;
|
|
if (loc_end > end)
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loc_end = end;
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add = true;
|
|
}
|
|
|
|
if (add) {
|
|
if (!check_realloc_usable_mem(um_info, 2))
|
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return -ENOMEM;
|
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|
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um_info->buf[um_info->idx++] = cpu_to_be64(loc_base);
|
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um_info->buf[um_info->idx++] =
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cpu_to_be64(loc_end - loc_base + 1);
|
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}
|
|
}
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|
|
return 0;
|
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}
|
|
|
|
/**
|
|
* kdump_setup_usable_lmb - This is a callback function that gets called by
|
|
* walk_drmem_lmbs for every LMB to set its
|
|
* usable memory ranges.
|
|
* @lmb: LMB info.
|
|
* @usm: linux,drconf-usable-memory property value.
|
|
* @data: Pointer to usable memory buffer and ranges info.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
static int kdump_setup_usable_lmb(struct drmem_lmb *lmb, const __be32 **usm,
|
|
void *data)
|
|
{
|
|
struct umem_info *um_info;
|
|
int tmp_idx, ret;
|
|
u64 base, end;
|
|
|
|
/*
|
|
* kdump load isn't supported on kernels already booted with
|
|
* linux,drconf-usable-memory property.
|
|
*/
|
|
if (*usm) {
|
|
pr_err("linux,drconf-usable-memory property already exists!");
|
|
return -EINVAL;
|
|
}
|
|
|
|
um_info = data;
|
|
tmp_idx = um_info->idx;
|
|
if (!check_realloc_usable_mem(um_info, 1))
|
|
return -ENOMEM;
|
|
|
|
um_info->idx++;
|
|
base = lmb->base_addr;
|
|
end = base + drmem_lmb_size() - 1;
|
|
ret = add_usable_mem(um_info, base, end);
|
|
if (!ret) {
|
|
/*
|
|
* Update the no. of ranges added. Two entries (base & size)
|
|
* for every range added.
|
|
*/
|
|
um_info->buf[tmp_idx] =
|
|
cpu_to_be64((um_info->idx - tmp_idx - 1) / 2);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define NODE_PATH_LEN 256
|
|
/**
|
|
* add_usable_mem_property - Add usable memory property for the given
|
|
* memory node.
|
|
* @fdt: Flattened device tree for the kdump kernel.
|
|
* @dn: Memory node.
|
|
* @um_info: Usable memory buffer and ranges info.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
static int add_usable_mem_property(void *fdt, struct device_node *dn,
|
|
struct umem_info *um_info)
|
|
{
|
|
int n_mem_addr_cells, n_mem_size_cells, node;
|
|
char path[NODE_PATH_LEN];
|
|
int i, len, ranges, ret;
|
|
const __be32 *prop;
|
|
u64 base, end;
|
|
|
|
of_node_get(dn);
|
|
|
|
if (snprintf(path, NODE_PATH_LEN, "%pOF", dn) > (NODE_PATH_LEN - 1)) {
|
|
pr_err("Buffer (%d) too small for memory node: %pOF\n",
|
|
NODE_PATH_LEN, dn);
|
|
return -EOVERFLOW;
|
|
}
|
|
pr_debug("Memory node path: %s\n", path);
|
|
|
|
/* Now that we know the path, find its offset in kdump kernel's fdt */
|
|
node = fdt_path_offset(fdt, path);
|
|
if (node < 0) {
|
|
pr_err("Malformed device tree: error reading %s\n", path);
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* Get the address & size cells */
|
|
n_mem_addr_cells = of_n_addr_cells(dn);
|
|
n_mem_size_cells = of_n_size_cells(dn);
|
|
pr_debug("address cells: %d, size cells: %d\n", n_mem_addr_cells,
|
|
n_mem_size_cells);
|
|
|
|
um_info->idx = 0;
|
|
if (!check_realloc_usable_mem(um_info, 2)) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
prop = of_get_property(dn, "reg", &len);
|
|
if (!prop || len <= 0) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* "reg" property represents sequence of (addr,size) tuples
|
|
* each representing a memory range.
|
|
*/
|
|
ranges = (len >> 2) / (n_mem_addr_cells + n_mem_size_cells);
|
|
|
|
for (i = 0; i < ranges; i++) {
|
|
base = of_read_number(prop, n_mem_addr_cells);
|
|
prop += n_mem_addr_cells;
|
|
end = base + of_read_number(prop, n_mem_size_cells) - 1;
|
|
prop += n_mem_size_cells;
|
|
|
|
ret = add_usable_mem(um_info, base, end);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* No kdump kernel usable memory found in this memory node.
|
|
* Write (0,0) tuple in linux,usable-memory property for
|
|
* this region to be ignored.
|
|
*/
|
|
if (um_info->idx == 0) {
|
|
um_info->buf[0] = 0;
|
|
um_info->buf[1] = 0;
|
|
um_info->idx = 2;
|
|
}
|
|
|
|
ret = fdt_setprop(fdt, node, "linux,usable-memory", um_info->buf,
|
|
(um_info->idx * sizeof(u64)));
|
|
|
|
out:
|
|
of_node_put(dn);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* update_usable_mem_fdt - Updates kdump kernel's fdt with linux,usable-memory
|
|
* and linux,drconf-usable-memory DT properties as
|
|
* appropriate to restrict its memory usage.
|
|
* @fdt: Flattened device tree for the kdump kernel.
|
|
* @usable_mem: Usable memory ranges for kdump kernel.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
static int update_usable_mem_fdt(void *fdt, struct crash_mem *usable_mem)
|
|
{
|
|
struct umem_info um_info;
|
|
struct device_node *dn;
|
|
int node, ret = 0;
|
|
|
|
if (!usable_mem) {
|
|
pr_err("Usable memory ranges for kdump kernel not found\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
node = fdt_path_offset(fdt, "/ibm,dynamic-reconfiguration-memory");
|
|
if (node == -FDT_ERR_NOTFOUND)
|
|
pr_debug("No dynamic reconfiguration memory found\n");
|
|
else if (node < 0) {
|
|
pr_err("Malformed device tree: error reading /ibm,dynamic-reconfiguration-memory.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
um_info.buf = NULL;
|
|
um_info.size = 0;
|
|
um_info.max_entries = 0;
|
|
um_info.idx = 0;
|
|
/* Memory ranges to look up */
|
|
um_info.ranges = &(usable_mem->ranges[0]);
|
|
um_info.nr_ranges = usable_mem->nr_ranges;
|
|
|
|
dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory");
|
|
if (dn) {
|
|
ret = walk_drmem_lmbs(dn, &um_info, kdump_setup_usable_lmb);
|
|
of_node_put(dn);
|
|
|
|
if (ret) {
|
|
pr_err("Could not setup linux,drconf-usable-memory property for kdump\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = fdt_setprop(fdt, node, "linux,drconf-usable-memory",
|
|
um_info.buf, (um_info.idx * sizeof(u64)));
|
|
if (ret) {
|
|
pr_err("Failed to update fdt with linux,drconf-usable-memory property");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Walk through each memory node and set linux,usable-memory property
|
|
* for the corresponding node in kdump kernel's fdt.
|
|
*/
|
|
for_each_node_by_type(dn, "memory") {
|
|
ret = add_usable_mem_property(fdt, dn, &um_info);
|
|
if (ret) {
|
|
pr_err("Failed to set linux,usable-memory property for %s node",
|
|
dn->full_name);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(um_info.buf);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* load_backup_segment - Locate a memory hole to place the backup region.
|
|
* @image: Kexec image.
|
|
* @kbuf: Buffer contents and memory parameters.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
static int load_backup_segment(struct kimage *image, struct kexec_buf *kbuf)
|
|
{
|
|
void *buf;
|
|
int ret;
|
|
|
|
/*
|
|
* Setup a source buffer for backup segment.
|
|
*
|
|
* A source buffer has no meaning for backup region as data will
|
|
* be copied from backup source, after crash, in the purgatory.
|
|
* But as load segment code doesn't recognize such segments,
|
|
* setup a dummy source buffer to keep it happy for now.
|
|
*/
|
|
buf = vzalloc(BACKUP_SRC_SIZE);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
kbuf->buffer = buf;
|
|
kbuf->mem = KEXEC_BUF_MEM_UNKNOWN;
|
|
kbuf->bufsz = kbuf->memsz = BACKUP_SRC_SIZE;
|
|
kbuf->top_down = false;
|
|
|
|
ret = kexec_add_buffer(kbuf);
|
|
if (ret) {
|
|
vfree(buf);
|
|
return ret;
|
|
}
|
|
|
|
image->arch.backup_buf = buf;
|
|
image->arch.backup_start = kbuf->mem;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* update_backup_region_phdr - Update backup region's offset for the core to
|
|
* export the region appropriately.
|
|
* @image: Kexec image.
|
|
* @ehdr: ELF core header.
|
|
*
|
|
* Assumes an exclusive program header is setup for the backup region
|
|
* in the ELF headers
|
|
*
|
|
* Returns nothing.
|
|
*/
|
|
static void update_backup_region_phdr(struct kimage *image, Elf64_Ehdr *ehdr)
|
|
{
|
|
Elf64_Phdr *phdr;
|
|
unsigned int i;
|
|
|
|
phdr = (Elf64_Phdr *)(ehdr + 1);
|
|
for (i = 0; i < ehdr->e_phnum; i++) {
|
|
if (phdr->p_paddr == BACKUP_SRC_START) {
|
|
phdr->p_offset = image->arch.backup_start;
|
|
pr_debug("Backup region offset updated to 0x%lx\n",
|
|
image->arch.backup_start);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* load_elfcorehdr_segment - Setup crash memory ranges and initialize elfcorehdr
|
|
* segment needed to load kdump kernel.
|
|
* @image: Kexec image.
|
|
* @kbuf: Buffer contents and memory parameters.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
static int load_elfcorehdr_segment(struct kimage *image, struct kexec_buf *kbuf)
|
|
{
|
|
struct crash_mem *cmem = NULL;
|
|
unsigned long headers_sz;
|
|
void *headers = NULL;
|
|
int ret;
|
|
|
|
ret = get_crash_memory_ranges(&cmem);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* Setup elfcorehdr segment */
|
|
ret = crash_prepare_elf64_headers(cmem, false, &headers, &headers_sz);
|
|
if (ret) {
|
|
pr_err("Failed to prepare elf headers for the core\n");
|
|
goto out;
|
|
}
|
|
|
|
/* Fix the offset for backup region in the ELF header */
|
|
update_backup_region_phdr(image, headers);
|
|
|
|
kbuf->buffer = headers;
|
|
kbuf->mem = KEXEC_BUF_MEM_UNKNOWN;
|
|
kbuf->bufsz = kbuf->memsz = headers_sz;
|
|
kbuf->top_down = false;
|
|
|
|
ret = kexec_add_buffer(kbuf);
|
|
if (ret) {
|
|
vfree(headers);
|
|
goto out;
|
|
}
|
|
|
|
image->arch.elfcorehdr_addr = kbuf->mem;
|
|
image->arch.elf_headers_sz = headers_sz;
|
|
image->arch.elf_headers = headers;
|
|
out:
|
|
kfree(cmem);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* load_crashdump_segments_ppc64 - Initialize the additional segements needed
|
|
* to load kdump kernel.
|
|
* @image: Kexec image.
|
|
* @kbuf: Buffer contents and memory parameters.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
int load_crashdump_segments_ppc64(struct kimage *image,
|
|
struct kexec_buf *kbuf)
|
|
{
|
|
int ret;
|
|
|
|
/* Load backup segment - first 64K bytes of the crashing kernel */
|
|
ret = load_backup_segment(image, kbuf);
|
|
if (ret) {
|
|
pr_err("Failed to load backup segment\n");
|
|
return ret;
|
|
}
|
|
pr_debug("Loaded the backup region at 0x%lx\n", kbuf->mem);
|
|
|
|
/* Load elfcorehdr segment - to export crashing kernel's vmcore */
|
|
ret = load_elfcorehdr_segment(image, kbuf);
|
|
if (ret) {
|
|
pr_err("Failed to load elfcorehdr segment\n");
|
|
return ret;
|
|
}
|
|
pr_debug("Loaded elf core header at 0x%lx, bufsz=0x%lx memsz=0x%lx\n",
|
|
image->arch.elfcorehdr_addr, kbuf->bufsz, kbuf->memsz);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* setup_purgatory_ppc64 - initialize PPC64 specific purgatory's global
|
|
* variables and call setup_purgatory() to initialize
|
|
* common global variable.
|
|
* @image: kexec image.
|
|
* @slave_code: Slave code for the purgatory.
|
|
* @fdt: Flattened device tree for the next kernel.
|
|
* @kernel_load_addr: Address where the kernel is loaded.
|
|
* @fdt_load_addr: Address where the flattened device tree is loaded.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
int setup_purgatory_ppc64(struct kimage *image, const void *slave_code,
|
|
const void *fdt, unsigned long kernel_load_addr,
|
|
unsigned long fdt_load_addr)
|
|
{
|
|
struct device_node *dn = NULL;
|
|
int ret;
|
|
|
|
ret = setup_purgatory(image, slave_code, fdt, kernel_load_addr,
|
|
fdt_load_addr);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (image->type == KEXEC_TYPE_CRASH) {
|
|
u32 my_run_at_load = 1;
|
|
|
|
/*
|
|
* Tell relocatable kernel to run at load address
|
|
* via the word meant for that at 0x5c.
|
|
*/
|
|
ret = kexec_purgatory_get_set_symbol(image, "run_at_load",
|
|
&my_run_at_load,
|
|
sizeof(my_run_at_load),
|
|
false);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
/* Tell purgatory where to look for backup region */
|
|
ret = kexec_purgatory_get_set_symbol(image, "backup_start",
|
|
&image->arch.backup_start,
|
|
sizeof(image->arch.backup_start),
|
|
false);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* Setup OPAL base & entry values */
|
|
dn = of_find_node_by_path("/ibm,opal");
|
|
if (dn) {
|
|
u64 val;
|
|
|
|
of_property_read_u64(dn, "opal-base-address", &val);
|
|
ret = kexec_purgatory_get_set_symbol(image, "opal_base", &val,
|
|
sizeof(val), false);
|
|
if (ret)
|
|
goto out;
|
|
|
|
of_property_read_u64(dn, "opal-entry-address", &val);
|
|
ret = kexec_purgatory_get_set_symbol(image, "opal_entry", &val,
|
|
sizeof(val), false);
|
|
}
|
|
out:
|
|
if (ret)
|
|
pr_err("Failed to setup purgatory symbols");
|
|
of_node_put(dn);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* setup_new_fdt_ppc64 - Update the flattend device-tree of the kernel
|
|
* being loaded.
|
|
* @image: kexec image being loaded.
|
|
* @fdt: Flattened device tree for the next kernel.
|
|
* @initrd_load_addr: Address where the next initrd will be loaded.
|
|
* @initrd_len: Size of the next initrd, or 0 if there will be none.
|
|
* @cmdline: Command line for the next kernel, or NULL if there will
|
|
* be none.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
int setup_new_fdt_ppc64(const struct kimage *image, void *fdt,
|
|
unsigned long initrd_load_addr,
|
|
unsigned long initrd_len, const char *cmdline)
|
|
{
|
|
struct crash_mem *umem = NULL, *rmem = NULL;
|
|
int i, nr_ranges, ret;
|
|
|
|
ret = setup_new_fdt(image, fdt, initrd_load_addr, initrd_len, cmdline);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* Restrict memory usage for kdump kernel by setting up
|
|
* usable memory ranges and memory reserve map.
|
|
*/
|
|
if (image->type == KEXEC_TYPE_CRASH) {
|
|
ret = get_usable_memory_ranges(&umem);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = update_usable_mem_fdt(fdt, umem);
|
|
if (ret) {
|
|
pr_err("Error setting up usable-memory property for kdump kernel\n");
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Ensure we don't touch crashed kernel's memory except the
|
|
* first 64K of RAM, which will be backed up.
|
|
*/
|
|
ret = fdt_add_mem_rsv(fdt, BACKUP_SRC_END + 1,
|
|
crashk_res.start - BACKUP_SRC_SIZE);
|
|
if (ret) {
|
|
pr_err("Error reserving crash memory: %s\n",
|
|
fdt_strerror(ret));
|
|
goto out;
|
|
}
|
|
|
|
/* Ensure backup region is not used by kdump/capture kernel */
|
|
ret = fdt_add_mem_rsv(fdt, image->arch.backup_start,
|
|
BACKUP_SRC_SIZE);
|
|
if (ret) {
|
|
pr_err("Error reserving memory for backup: %s\n",
|
|
fdt_strerror(ret));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Update memory reserve map */
|
|
ret = get_reserved_memory_ranges(&rmem);
|
|
if (ret)
|
|
goto out;
|
|
|
|
nr_ranges = rmem ? rmem->nr_ranges : 0;
|
|
for (i = 0; i < nr_ranges; i++) {
|
|
u64 base, size;
|
|
|
|
base = rmem->ranges[i].start;
|
|
size = rmem->ranges[i].end - base + 1;
|
|
ret = fdt_add_mem_rsv(fdt, base, size);
|
|
if (ret) {
|
|
pr_err("Error updating memory reserve map: %s\n",
|
|
fdt_strerror(ret));
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(rmem);
|
|
kfree(umem);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* arch_kexec_locate_mem_hole - Skip special memory regions like rtas, opal,
|
|
* tce-table, reserved-ranges & such (exclude
|
|
* memory ranges) as they can't be used for kexec
|
|
* segment buffer. Sets kbuf->mem when a suitable
|
|
* memory hole is found.
|
|
* @kbuf: Buffer contents and memory parameters.
|
|
*
|
|
* Assumes minimum of PAGE_SIZE alignment for kbuf->memsz & kbuf->buf_align.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
int arch_kexec_locate_mem_hole(struct kexec_buf *kbuf)
|
|
{
|
|
struct crash_mem **emem;
|
|
u64 buf_min, buf_max;
|
|
int ret;
|
|
|
|
/* Look up the exclude ranges list while locating the memory hole */
|
|
emem = &(kbuf->image->arch.exclude_ranges);
|
|
if (!(*emem) || ((*emem)->nr_ranges == 0)) {
|
|
pr_warn("No exclude range list. Using the default locate mem hole method\n");
|
|
return kexec_locate_mem_hole(kbuf);
|
|
}
|
|
|
|
buf_min = kbuf->buf_min;
|
|
buf_max = kbuf->buf_max;
|
|
/* Segments for kdump kernel should be within crashkernel region */
|
|
if (kbuf->image->type == KEXEC_TYPE_CRASH) {
|
|
buf_min = (buf_min < crashk_res.start ?
|
|
crashk_res.start : buf_min);
|
|
buf_max = (buf_max > crashk_res.end ?
|
|
crashk_res.end : buf_max);
|
|
}
|
|
|
|
if (buf_min > buf_max) {
|
|
pr_err("Invalid buffer min and/or max values\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (kbuf->top_down)
|
|
ret = locate_mem_hole_top_down_ppc64(kbuf, buf_min, buf_max,
|
|
*emem);
|
|
else
|
|
ret = locate_mem_hole_bottom_up_ppc64(kbuf, buf_min, buf_max,
|
|
*emem);
|
|
|
|
/* Add the buffer allocated to the exclude list for the next lookup */
|
|
if (!ret) {
|
|
add_mem_range(emem, kbuf->mem, kbuf->memsz);
|
|
sort_memory_ranges(*emem, true);
|
|
} else {
|
|
pr_err("Failed to locate memory buffer of size %lu\n",
|
|
kbuf->memsz);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* arch_kexec_kernel_image_probe - Does additional handling needed to setup
|
|
* kexec segments.
|
|
* @image: kexec image being loaded.
|
|
* @buf: Buffer pointing to elf data.
|
|
* @buf_len: Length of the buffer.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
int arch_kexec_kernel_image_probe(struct kimage *image, void *buf,
|
|
unsigned long buf_len)
|
|
{
|
|
int ret;
|
|
|
|
/* Get exclude memory ranges needed for setting up kexec segments */
|
|
ret = get_exclude_memory_ranges(&(image->arch.exclude_ranges));
|
|
if (ret) {
|
|
pr_err("Failed to setup exclude memory ranges for buffer lookup\n");
|
|
return ret;
|
|
}
|
|
|
|
return kexec_image_probe_default(image, buf, buf_len);
|
|
}
|
|
|
|
/**
|
|
* arch_kimage_file_post_load_cleanup - Frees up all the allocations done
|
|
* while loading the image.
|
|
* @image: kexec image being loaded.
|
|
*
|
|
* Returns 0 on success, negative errno on error.
|
|
*/
|
|
int arch_kimage_file_post_load_cleanup(struct kimage *image)
|
|
{
|
|
kfree(image->arch.exclude_ranges);
|
|
image->arch.exclude_ranges = NULL;
|
|
|
|
vfree(image->arch.backup_buf);
|
|
image->arch.backup_buf = NULL;
|
|
|
|
vfree(image->arch.elf_headers);
|
|
image->arch.elf_headers = NULL;
|
|
image->arch.elf_headers_sz = 0;
|
|
|
|
return kexec_image_post_load_cleanup_default(image);
|
|
}
|