1318 lines
35 KiB
C
1318 lines
35 KiB
C
/*
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* Firmware Assisted dump: A robust mechanism to get reliable kernel crash
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* dump with assistance from firmware. This approach does not use kexec,
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* instead firmware assists in booting the kdump kernel while preserving
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* memory contents. The most of the code implementation has been adapted
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* from phyp assisted dump implementation written by Linas Vepstas and
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* Manish Ahuja
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright 2011 IBM Corporation
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* Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
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*/
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#undef DEBUG
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#define pr_fmt(fmt) "fadump: " fmt
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#include <linux/string.h>
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#include <linux/memblock.h>
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#include <linux/delay.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/crash_dump.h>
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#include <linux/kobject.h>
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#include <linux/sysfs.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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#include <asm/fadump.h>
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#include <asm/debug.h>
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#include <asm/setup.h>
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static struct fw_dump fw_dump;
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static struct fadump_mem_struct fdm;
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static const struct fadump_mem_struct *fdm_active;
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static DEFINE_MUTEX(fadump_mutex);
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struct fad_crash_memory_ranges crash_memory_ranges[INIT_CRASHMEM_RANGES];
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int crash_mem_ranges;
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/* Scan the Firmware Assisted dump configuration details. */
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int __init early_init_dt_scan_fw_dump(unsigned long node,
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const char *uname, int depth, void *data)
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{
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__be32 *sections;
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int i, num_sections;
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unsigned long size;
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const int *token;
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if (depth != 1 || strcmp(uname, "rtas") != 0)
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return 0;
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/*
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* Check if Firmware Assisted dump is supported. if yes, check
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* if dump has been initiated on last reboot.
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*/
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token = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL);
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if (!token)
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return 0;
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fw_dump.fadump_supported = 1;
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fw_dump.ibm_configure_kernel_dump = *token;
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/*
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* The 'ibm,kernel-dump' rtas node is present only if there is
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* dump data waiting for us.
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*/
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fdm_active = of_get_flat_dt_prop(node, "ibm,kernel-dump", NULL);
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if (fdm_active)
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fw_dump.dump_active = 1;
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/* Get the sizes required to store dump data for the firmware provided
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* dump sections.
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* For each dump section type supported, a 32bit cell which defines
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* the ID of a supported section followed by two 32 bit cells which
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* gives teh size of the section in bytes.
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*/
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sections = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes",
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&size);
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if (!sections)
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return 0;
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num_sections = size / (3 * sizeof(u32));
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for (i = 0; i < num_sections; i++, sections += 3) {
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u32 type = (u32)of_read_number(sections, 1);
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switch (type) {
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case FADUMP_CPU_STATE_DATA:
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fw_dump.cpu_state_data_size =
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of_read_ulong(§ions[1], 2);
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break;
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case FADUMP_HPTE_REGION:
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fw_dump.hpte_region_size =
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of_read_ulong(§ions[1], 2);
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break;
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}
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}
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return 1;
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}
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int is_fadump_active(void)
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{
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return fw_dump.dump_active;
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}
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/* Print firmware assisted dump configurations for debugging purpose. */
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static void fadump_show_config(void)
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{
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pr_debug("Support for firmware-assisted dump (fadump): %s\n",
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(fw_dump.fadump_supported ? "present" : "no support"));
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if (!fw_dump.fadump_supported)
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return;
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pr_debug("Fadump enabled : %s\n",
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(fw_dump.fadump_enabled ? "yes" : "no"));
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pr_debug("Dump Active : %s\n",
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(fw_dump.dump_active ? "yes" : "no"));
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pr_debug("Dump section sizes:\n");
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pr_debug(" CPU state data size: %lx\n", fw_dump.cpu_state_data_size);
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pr_debug(" HPTE region size : %lx\n", fw_dump.hpte_region_size);
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pr_debug("Boot memory size : %lx\n", fw_dump.boot_memory_size);
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}
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static unsigned long init_fadump_mem_struct(struct fadump_mem_struct *fdm,
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unsigned long addr)
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{
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if (!fdm)
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return 0;
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memset(fdm, 0, sizeof(struct fadump_mem_struct));
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addr = addr & PAGE_MASK;
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fdm->header.dump_format_version = 0x00000001;
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fdm->header.dump_num_sections = 3;
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fdm->header.dump_status_flag = 0;
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fdm->header.offset_first_dump_section =
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(u32)offsetof(struct fadump_mem_struct, cpu_state_data);
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/*
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* Fields for disk dump option.
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* We are not using disk dump option, hence set these fields to 0.
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*/
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fdm->header.dd_block_size = 0;
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fdm->header.dd_block_offset = 0;
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fdm->header.dd_num_blocks = 0;
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fdm->header.dd_offset_disk_path = 0;
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/* set 0 to disable an automatic dump-reboot. */
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fdm->header.max_time_auto = 0;
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/* Kernel dump sections */
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/* cpu state data section. */
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fdm->cpu_state_data.request_flag = FADUMP_REQUEST_FLAG;
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fdm->cpu_state_data.source_data_type = FADUMP_CPU_STATE_DATA;
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fdm->cpu_state_data.source_address = 0;
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fdm->cpu_state_data.source_len = fw_dump.cpu_state_data_size;
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fdm->cpu_state_data.destination_address = addr;
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addr += fw_dump.cpu_state_data_size;
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/* hpte region section */
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fdm->hpte_region.request_flag = FADUMP_REQUEST_FLAG;
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fdm->hpte_region.source_data_type = FADUMP_HPTE_REGION;
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fdm->hpte_region.source_address = 0;
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fdm->hpte_region.source_len = fw_dump.hpte_region_size;
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fdm->hpte_region.destination_address = addr;
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addr += fw_dump.hpte_region_size;
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/* RMA region section */
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fdm->rmr_region.request_flag = FADUMP_REQUEST_FLAG;
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fdm->rmr_region.source_data_type = FADUMP_REAL_MODE_REGION;
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fdm->rmr_region.source_address = RMA_START;
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fdm->rmr_region.source_len = fw_dump.boot_memory_size;
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fdm->rmr_region.destination_address = addr;
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addr += fw_dump.boot_memory_size;
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return addr;
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}
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/**
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* fadump_calculate_reserve_size(): reserve variable boot area 5% of System RAM
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*
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* Function to find the largest memory size we need to reserve during early
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* boot process. This will be the size of the memory that is required for a
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* kernel to boot successfully.
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*
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* This function has been taken from phyp-assisted dump feature implementation.
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*
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* returns larger of 256MB or 5% rounded down to multiples of 256MB.
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*
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* TODO: Come up with better approach to find out more accurate memory size
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* that is required for a kernel to boot successfully.
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*
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*/
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static inline unsigned long fadump_calculate_reserve_size(void)
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{
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unsigned long size;
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/*
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* Check if the size is specified through fadump_reserve_mem= cmdline
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* option. If yes, then use that.
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*/
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if (fw_dump.reserve_bootvar)
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return fw_dump.reserve_bootvar;
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/* divide by 20 to get 5% of value */
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size = memblock_end_of_DRAM() / 20;
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/* round it down in multiples of 256 */
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size = size & ~0x0FFFFFFFUL;
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/* Truncate to memory_limit. We don't want to over reserve the memory.*/
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if (memory_limit && size > memory_limit)
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size = memory_limit;
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return (size > MIN_BOOT_MEM ? size : MIN_BOOT_MEM);
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}
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/*
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* Calculate the total memory size required to be reserved for
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* firmware-assisted dump registration.
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*/
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static unsigned long get_fadump_area_size(void)
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{
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unsigned long size = 0;
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size += fw_dump.cpu_state_data_size;
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size += fw_dump.hpte_region_size;
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size += fw_dump.boot_memory_size;
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size += sizeof(struct fadump_crash_info_header);
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size += sizeof(struct elfhdr); /* ELF core header.*/
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size += sizeof(struct elf_phdr); /* place holder for cpu notes */
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/* Program headers for crash memory regions. */
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size += sizeof(struct elf_phdr) * (memblock_num_regions(memory) + 2);
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size = PAGE_ALIGN(size);
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return size;
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}
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int __init fadump_reserve_mem(void)
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{
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unsigned long base, size, memory_boundary;
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if (!fw_dump.fadump_enabled)
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return 0;
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if (!fw_dump.fadump_supported) {
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printk(KERN_INFO "Firmware-assisted dump is not supported on"
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" this hardware\n");
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fw_dump.fadump_enabled = 0;
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return 0;
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}
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/*
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* Initialize boot memory size
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* If dump is active then we have already calculated the size during
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* first kernel.
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*/
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if (fdm_active)
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fw_dump.boot_memory_size = fdm_active->rmr_region.source_len;
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else
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fw_dump.boot_memory_size = fadump_calculate_reserve_size();
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/*
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* Calculate the memory boundary.
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* If memory_limit is less than actual memory boundary then reserve
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* the memory for fadump beyond the memory_limit and adjust the
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* memory_limit accordingly, so that the running kernel can run with
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* specified memory_limit.
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*/
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if (memory_limit && memory_limit < memblock_end_of_DRAM()) {
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size = get_fadump_area_size();
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if ((memory_limit + size) < memblock_end_of_DRAM())
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memory_limit += size;
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else
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memory_limit = memblock_end_of_DRAM();
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printk(KERN_INFO "Adjusted memory_limit for firmware-assisted"
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" dump, now %#016llx\n",
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(unsigned long long)memory_limit);
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}
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if (memory_limit)
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memory_boundary = memory_limit;
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else
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memory_boundary = memblock_end_of_DRAM();
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if (fw_dump.dump_active) {
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printk(KERN_INFO "Firmware-assisted dump is active.\n");
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/*
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* If last boot has crashed then reserve all the memory
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* above boot_memory_size so that we don't touch it until
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* dump is written to disk by userspace tool. This memory
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* will be released for general use once the dump is saved.
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*/
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base = fw_dump.boot_memory_size;
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size = memory_boundary - base;
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memblock_reserve(base, size);
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printk(KERN_INFO "Reserved %ldMB of memory at %ldMB "
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"for saving crash dump\n",
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(unsigned long)(size >> 20),
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(unsigned long)(base >> 20));
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fw_dump.fadumphdr_addr =
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fdm_active->rmr_region.destination_address +
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fdm_active->rmr_region.source_len;
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pr_debug("fadumphdr_addr = %p\n",
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(void *) fw_dump.fadumphdr_addr);
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} else {
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/* Reserve the memory at the top of memory. */
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size = get_fadump_area_size();
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base = memory_boundary - size;
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memblock_reserve(base, size);
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printk(KERN_INFO "Reserved %ldMB of memory at %ldMB "
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"for firmware-assisted dump\n",
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(unsigned long)(size >> 20),
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(unsigned long)(base >> 20));
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}
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fw_dump.reserve_dump_area_start = base;
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fw_dump.reserve_dump_area_size = size;
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return 1;
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}
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/* Look for fadump= cmdline option. */
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static int __init early_fadump_param(char *p)
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{
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if (!p)
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return 1;
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if (strncmp(p, "on", 2) == 0)
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fw_dump.fadump_enabled = 1;
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else if (strncmp(p, "off", 3) == 0)
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fw_dump.fadump_enabled = 0;
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return 0;
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}
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early_param("fadump", early_fadump_param);
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/* Look for fadump_reserve_mem= cmdline option */
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static int __init early_fadump_reserve_mem(char *p)
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{
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if (p)
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fw_dump.reserve_bootvar = memparse(p, &p);
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return 0;
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}
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early_param("fadump_reserve_mem", early_fadump_reserve_mem);
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static void register_fw_dump(struct fadump_mem_struct *fdm)
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{
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int rc;
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unsigned int wait_time;
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pr_debug("Registering for firmware-assisted kernel dump...\n");
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/* TODO: Add upper time limit for the delay */
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do {
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rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
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FADUMP_REGISTER, fdm,
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sizeof(struct fadump_mem_struct));
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wait_time = rtas_busy_delay_time(rc);
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if (wait_time)
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mdelay(wait_time);
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} while (wait_time);
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switch (rc) {
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case -1:
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printk(KERN_ERR "Failed to register firmware-assisted kernel"
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" dump. Hardware Error(%d).\n", rc);
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break;
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case -3:
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printk(KERN_ERR "Failed to register firmware-assisted kernel"
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" dump. Parameter Error(%d).\n", rc);
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break;
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case -9:
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printk(KERN_ERR "firmware-assisted kernel dump is already "
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" registered.");
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fw_dump.dump_registered = 1;
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break;
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case 0:
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printk(KERN_INFO "firmware-assisted kernel dump registration"
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" is successful\n");
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fw_dump.dump_registered = 1;
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break;
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}
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}
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void crash_fadump(struct pt_regs *regs, const char *str)
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{
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struct fadump_crash_info_header *fdh = NULL;
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if (!fw_dump.dump_registered || !fw_dump.fadumphdr_addr)
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return;
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fdh = __va(fw_dump.fadumphdr_addr);
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crashing_cpu = smp_processor_id();
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fdh->crashing_cpu = crashing_cpu;
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crash_save_vmcoreinfo();
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if (regs)
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fdh->regs = *regs;
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else
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ppc_save_regs(&fdh->regs);
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fdh->cpu_online_mask = *cpu_online_mask;
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/* Call ibm,os-term rtas call to trigger firmware assisted dump */
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rtas_os_term((char *)str);
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}
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#define GPR_MASK 0xffffff0000000000
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static inline int fadump_gpr_index(u64 id)
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{
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int i = -1;
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char str[3];
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if ((id & GPR_MASK) == REG_ID("GPR")) {
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/* get the digits at the end */
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id &= ~GPR_MASK;
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id >>= 24;
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str[2] = '\0';
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str[1] = id & 0xff;
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str[0] = (id >> 8) & 0xff;
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sscanf(str, "%d", &i);
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if (i > 31)
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i = -1;
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}
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return i;
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}
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static inline void fadump_set_regval(struct pt_regs *regs, u64 reg_id,
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u64 reg_val)
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{
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int i;
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i = fadump_gpr_index(reg_id);
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if (i >= 0)
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regs->gpr[i] = (unsigned long)reg_val;
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else if (reg_id == REG_ID("NIA"))
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regs->nip = (unsigned long)reg_val;
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else if (reg_id == REG_ID("MSR"))
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regs->msr = (unsigned long)reg_val;
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else if (reg_id == REG_ID("CTR"))
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regs->ctr = (unsigned long)reg_val;
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else if (reg_id == REG_ID("LR"))
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regs->link = (unsigned long)reg_val;
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else if (reg_id == REG_ID("XER"))
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regs->xer = (unsigned long)reg_val;
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else if (reg_id == REG_ID("CR"))
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regs->ccr = (unsigned long)reg_val;
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else if (reg_id == REG_ID("DAR"))
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regs->dar = (unsigned long)reg_val;
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else if (reg_id == REG_ID("DSISR"))
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regs->dsisr = (unsigned long)reg_val;
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}
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static struct fadump_reg_entry*
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fadump_read_registers(struct fadump_reg_entry *reg_entry, struct pt_regs *regs)
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{
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memset(regs, 0, sizeof(struct pt_regs));
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|
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while (reg_entry->reg_id != REG_ID("CPUEND")) {
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fadump_set_regval(regs, reg_entry->reg_id,
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reg_entry->reg_value);
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reg_entry++;
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}
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reg_entry++;
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return reg_entry;
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}
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|
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static u32 *fadump_append_elf_note(u32 *buf, char *name, unsigned type,
|
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void *data, size_t data_len)
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{
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struct elf_note note;
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note.n_namesz = strlen(name) + 1;
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note.n_descsz = data_len;
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note.n_type = type;
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memcpy(buf, ¬e, sizeof(note));
|
|
buf += (sizeof(note) + 3)/4;
|
|
memcpy(buf, name, note.n_namesz);
|
|
buf += (note.n_namesz + 3)/4;
|
|
memcpy(buf, data, note.n_descsz);
|
|
buf += (note.n_descsz + 3)/4;
|
|
|
|
return buf;
|
|
}
|
|
|
|
static void fadump_final_note(u32 *buf)
|
|
{
|
|
struct elf_note note;
|
|
|
|
note.n_namesz = 0;
|
|
note.n_descsz = 0;
|
|
note.n_type = 0;
|
|
memcpy(buf, ¬e, sizeof(note));
|
|
}
|
|
|
|
static u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs)
|
|
{
|
|
struct elf_prstatus prstatus;
|
|
|
|
memset(&prstatus, 0, sizeof(prstatus));
|
|
/*
|
|
* FIXME: How do i get PID? Do I really need it?
|
|
* prstatus.pr_pid = ????
|
|
*/
|
|
elf_core_copy_kernel_regs(&prstatus.pr_reg, regs);
|
|
buf = fadump_append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS,
|
|
&prstatus, sizeof(prstatus));
|
|
return buf;
|
|
}
|
|
|
|
static void fadump_update_elfcore_header(char *bufp)
|
|
{
|
|
struct elfhdr *elf;
|
|
struct elf_phdr *phdr;
|
|
|
|
elf = (struct elfhdr *)bufp;
|
|
bufp += sizeof(struct elfhdr);
|
|
|
|
/* First note is a place holder for cpu notes info. */
|
|
phdr = (struct elf_phdr *)bufp;
|
|
|
|
if (phdr->p_type == PT_NOTE) {
|
|
phdr->p_paddr = fw_dump.cpu_notes_buf;
|
|
phdr->p_offset = phdr->p_paddr;
|
|
phdr->p_filesz = fw_dump.cpu_notes_buf_size;
|
|
phdr->p_memsz = fw_dump.cpu_notes_buf_size;
|
|
}
|
|
return;
|
|
}
|
|
|
|
static void *fadump_cpu_notes_buf_alloc(unsigned long size)
|
|
{
|
|
void *vaddr;
|
|
struct page *page;
|
|
unsigned long order, count, i;
|
|
|
|
order = get_order(size);
|
|
vaddr = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, order);
|
|
if (!vaddr)
|
|
return NULL;
|
|
|
|
count = 1 << order;
|
|
page = virt_to_page(vaddr);
|
|
for (i = 0; i < count; i++)
|
|
SetPageReserved(page + i);
|
|
return vaddr;
|
|
}
|
|
|
|
static void fadump_cpu_notes_buf_free(unsigned long vaddr, unsigned long size)
|
|
{
|
|
struct page *page;
|
|
unsigned long order, count, i;
|
|
|
|
order = get_order(size);
|
|
count = 1 << order;
|
|
page = virt_to_page(vaddr);
|
|
for (i = 0; i < count; i++)
|
|
ClearPageReserved(page + i);
|
|
__free_pages(page, order);
|
|
}
|
|
|
|
/*
|
|
* Read CPU state dump data and convert it into ELF notes.
|
|
* The CPU dump starts with magic number "REGSAVE". NumCpusOffset should be
|
|
* used to access the data to allow for additional fields to be added without
|
|
* affecting compatibility. Each list of registers for a CPU starts with
|
|
* "CPUSTRT" and ends with "CPUEND". Each register entry is of 16 bytes,
|
|
* 8 Byte ASCII identifier and 8 Byte register value. The register entry
|
|
* with identifier "CPUSTRT" and "CPUEND" contains 4 byte cpu id as part
|
|
* of register value. For more details refer to PAPR document.
|
|
*
|
|
* Only for the crashing cpu we ignore the CPU dump data and get exact
|
|
* state from fadump crash info structure populated by first kernel at the
|
|
* time of crash.
|
|
*/
|
|
static int __init fadump_build_cpu_notes(const struct fadump_mem_struct *fdm)
|
|
{
|
|
struct fadump_reg_save_area_header *reg_header;
|
|
struct fadump_reg_entry *reg_entry;
|
|
struct fadump_crash_info_header *fdh = NULL;
|
|
void *vaddr;
|
|
unsigned long addr;
|
|
u32 num_cpus, *note_buf;
|
|
struct pt_regs regs;
|
|
int i, rc = 0, cpu = 0;
|
|
|
|
if (!fdm->cpu_state_data.bytes_dumped)
|
|
return -EINVAL;
|
|
|
|
addr = fdm->cpu_state_data.destination_address;
|
|
vaddr = __va(addr);
|
|
|
|
reg_header = vaddr;
|
|
if (reg_header->magic_number != REGSAVE_AREA_MAGIC) {
|
|
printk(KERN_ERR "Unable to read register save area.\n");
|
|
return -ENOENT;
|
|
}
|
|
pr_debug("--------CPU State Data------------\n");
|
|
pr_debug("Magic Number: %llx\n", reg_header->magic_number);
|
|
pr_debug("NumCpuOffset: %x\n", reg_header->num_cpu_offset);
|
|
|
|
vaddr += reg_header->num_cpu_offset;
|
|
num_cpus = *((u32 *)(vaddr));
|
|
pr_debug("NumCpus : %u\n", num_cpus);
|
|
vaddr += sizeof(u32);
|
|
reg_entry = (struct fadump_reg_entry *)vaddr;
|
|
|
|
/* Allocate buffer to hold cpu crash notes. */
|
|
fw_dump.cpu_notes_buf_size = num_cpus * sizeof(note_buf_t);
|
|
fw_dump.cpu_notes_buf_size = PAGE_ALIGN(fw_dump.cpu_notes_buf_size);
|
|
note_buf = fadump_cpu_notes_buf_alloc(fw_dump.cpu_notes_buf_size);
|
|
if (!note_buf) {
|
|
printk(KERN_ERR "Failed to allocate 0x%lx bytes for "
|
|
"cpu notes buffer\n", fw_dump.cpu_notes_buf_size);
|
|
return -ENOMEM;
|
|
}
|
|
fw_dump.cpu_notes_buf = __pa(note_buf);
|
|
|
|
pr_debug("Allocated buffer for cpu notes of size %ld at %p\n",
|
|
(num_cpus * sizeof(note_buf_t)), note_buf);
|
|
|
|
if (fw_dump.fadumphdr_addr)
|
|
fdh = __va(fw_dump.fadumphdr_addr);
|
|
|
|
for (i = 0; i < num_cpus; i++) {
|
|
if (reg_entry->reg_id != REG_ID("CPUSTRT")) {
|
|
printk(KERN_ERR "Unable to read CPU state data\n");
|
|
rc = -ENOENT;
|
|
goto error_out;
|
|
}
|
|
/* Lower 4 bytes of reg_value contains logical cpu id */
|
|
cpu = reg_entry->reg_value & FADUMP_CPU_ID_MASK;
|
|
if (!cpumask_test_cpu(cpu, &fdh->cpu_online_mask)) {
|
|
SKIP_TO_NEXT_CPU(reg_entry);
|
|
continue;
|
|
}
|
|
pr_debug("Reading register data for cpu %d...\n", cpu);
|
|
if (fdh && fdh->crashing_cpu == cpu) {
|
|
regs = fdh->regs;
|
|
note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
|
|
SKIP_TO_NEXT_CPU(reg_entry);
|
|
} else {
|
|
reg_entry++;
|
|
reg_entry = fadump_read_registers(reg_entry, ®s);
|
|
note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
|
|
}
|
|
}
|
|
fadump_final_note(note_buf);
|
|
|
|
pr_debug("Updating elfcore header (%llx) with cpu notes\n",
|
|
fdh->elfcorehdr_addr);
|
|
fadump_update_elfcore_header((char *)__va(fdh->elfcorehdr_addr));
|
|
return 0;
|
|
|
|
error_out:
|
|
fadump_cpu_notes_buf_free((unsigned long)__va(fw_dump.cpu_notes_buf),
|
|
fw_dump.cpu_notes_buf_size);
|
|
fw_dump.cpu_notes_buf = 0;
|
|
fw_dump.cpu_notes_buf_size = 0;
|
|
return rc;
|
|
|
|
}
|
|
|
|
/*
|
|
* Validate and process the dump data stored by firmware before exporting
|
|
* it through '/proc/vmcore'.
|
|
*/
|
|
static int __init process_fadump(const struct fadump_mem_struct *fdm_active)
|
|
{
|
|
struct fadump_crash_info_header *fdh;
|
|
int rc = 0;
|
|
|
|
if (!fdm_active || !fw_dump.fadumphdr_addr)
|
|
return -EINVAL;
|
|
|
|
/* Check if the dump data is valid. */
|
|
if ((fdm_active->header.dump_status_flag == FADUMP_ERROR_FLAG) ||
|
|
(fdm_active->cpu_state_data.error_flags != 0) ||
|
|
(fdm_active->rmr_region.error_flags != 0)) {
|
|
printk(KERN_ERR "Dump taken by platform is not valid\n");
|
|
return -EINVAL;
|
|
}
|
|
if ((fdm_active->rmr_region.bytes_dumped !=
|
|
fdm_active->rmr_region.source_len) ||
|
|
!fdm_active->cpu_state_data.bytes_dumped) {
|
|
printk(KERN_ERR "Dump taken by platform is incomplete\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Validate the fadump crash info header */
|
|
fdh = __va(fw_dump.fadumphdr_addr);
|
|
if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) {
|
|
printk(KERN_ERR "Crash info header is not valid.\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
rc = fadump_build_cpu_notes(fdm_active);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/*
|
|
* We are done validating dump info and elfcore header is now ready
|
|
* to be exported. set elfcorehdr_addr so that vmcore module will
|
|
* export the elfcore header through '/proc/vmcore'.
|
|
*/
|
|
elfcorehdr_addr = fdh->elfcorehdr_addr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void fadump_add_crash_memory(unsigned long long base,
|
|
unsigned long long end)
|
|
{
|
|
if (base == end)
|
|
return;
|
|
|
|
pr_debug("crash_memory_range[%d] [%#016llx-%#016llx], %#llx bytes\n",
|
|
crash_mem_ranges, base, end - 1, (end - base));
|
|
crash_memory_ranges[crash_mem_ranges].base = base;
|
|
crash_memory_ranges[crash_mem_ranges].size = end - base;
|
|
crash_mem_ranges++;
|
|
}
|
|
|
|
static void fadump_exclude_reserved_area(unsigned long long start,
|
|
unsigned long long end)
|
|
{
|
|
unsigned long long ra_start, ra_end;
|
|
|
|
ra_start = fw_dump.reserve_dump_area_start;
|
|
ra_end = ra_start + fw_dump.reserve_dump_area_size;
|
|
|
|
if ((ra_start < end) && (ra_end > start)) {
|
|
if ((start < ra_start) && (end > ra_end)) {
|
|
fadump_add_crash_memory(start, ra_start);
|
|
fadump_add_crash_memory(ra_end, end);
|
|
} else if (start < ra_start) {
|
|
fadump_add_crash_memory(start, ra_start);
|
|
} else if (ra_end < end) {
|
|
fadump_add_crash_memory(ra_end, end);
|
|
}
|
|
} else
|
|
fadump_add_crash_memory(start, end);
|
|
}
|
|
|
|
static int fadump_init_elfcore_header(char *bufp)
|
|
{
|
|
struct elfhdr *elf;
|
|
|
|
elf = (struct elfhdr *) bufp;
|
|
bufp += sizeof(struct elfhdr);
|
|
memcpy(elf->e_ident, ELFMAG, SELFMAG);
|
|
elf->e_ident[EI_CLASS] = ELF_CLASS;
|
|
elf->e_ident[EI_DATA] = ELF_DATA;
|
|
elf->e_ident[EI_VERSION] = EV_CURRENT;
|
|
elf->e_ident[EI_OSABI] = ELF_OSABI;
|
|
memset(elf->e_ident+EI_PAD, 0, EI_NIDENT-EI_PAD);
|
|
elf->e_type = ET_CORE;
|
|
elf->e_machine = ELF_ARCH;
|
|
elf->e_version = EV_CURRENT;
|
|
elf->e_entry = 0;
|
|
elf->e_phoff = sizeof(struct elfhdr);
|
|
elf->e_shoff = 0;
|
|
elf->e_flags = ELF_CORE_EFLAGS;
|
|
elf->e_ehsize = sizeof(struct elfhdr);
|
|
elf->e_phentsize = sizeof(struct elf_phdr);
|
|
elf->e_phnum = 0;
|
|
elf->e_shentsize = 0;
|
|
elf->e_shnum = 0;
|
|
elf->e_shstrndx = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Traverse through memblock structure and setup crash memory ranges. These
|
|
* ranges will be used create PT_LOAD program headers in elfcore header.
|
|
*/
|
|
static void fadump_setup_crash_memory_ranges(void)
|
|
{
|
|
struct memblock_region *reg;
|
|
unsigned long long start, end;
|
|
|
|
pr_debug("Setup crash memory ranges.\n");
|
|
crash_mem_ranges = 0;
|
|
/*
|
|
* add the first memory chunk (RMA_START through boot_memory_size) as
|
|
* a separate memory chunk. The reason is, at the time crash firmware
|
|
* will move the content of this memory chunk to different location
|
|
* specified during fadump registration. We need to create a separate
|
|
* program header for this chunk with the correct offset.
|
|
*/
|
|
fadump_add_crash_memory(RMA_START, fw_dump.boot_memory_size);
|
|
|
|
for_each_memblock(memory, reg) {
|
|
start = (unsigned long long)reg->base;
|
|
end = start + (unsigned long long)reg->size;
|
|
if (start == RMA_START && end >= fw_dump.boot_memory_size)
|
|
start = fw_dump.boot_memory_size;
|
|
|
|
/* add this range excluding the reserved dump area. */
|
|
fadump_exclude_reserved_area(start, end);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the given physical address falls within the boot memory region then
|
|
* return the relocated address that points to the dump region reserved
|
|
* for saving initial boot memory contents.
|
|
*/
|
|
static inline unsigned long fadump_relocate(unsigned long paddr)
|
|
{
|
|
if (paddr > RMA_START && paddr < fw_dump.boot_memory_size)
|
|
return fdm.rmr_region.destination_address + paddr;
|
|
else
|
|
return paddr;
|
|
}
|
|
|
|
static int fadump_create_elfcore_headers(char *bufp)
|
|
{
|
|
struct elfhdr *elf;
|
|
struct elf_phdr *phdr;
|
|
int i;
|
|
|
|
fadump_init_elfcore_header(bufp);
|
|
elf = (struct elfhdr *)bufp;
|
|
bufp += sizeof(struct elfhdr);
|
|
|
|
/*
|
|
* setup ELF PT_NOTE, place holder for cpu notes info. The notes info
|
|
* will be populated during second kernel boot after crash. Hence
|
|
* this PT_NOTE will always be the first elf note.
|
|
*
|
|
* NOTE: Any new ELF note addition should be placed after this note.
|
|
*/
|
|
phdr = (struct elf_phdr *)bufp;
|
|
bufp += sizeof(struct elf_phdr);
|
|
phdr->p_type = PT_NOTE;
|
|
phdr->p_flags = 0;
|
|
phdr->p_vaddr = 0;
|
|
phdr->p_align = 0;
|
|
|
|
phdr->p_offset = 0;
|
|
phdr->p_paddr = 0;
|
|
phdr->p_filesz = 0;
|
|
phdr->p_memsz = 0;
|
|
|
|
(elf->e_phnum)++;
|
|
|
|
/* setup ELF PT_NOTE for vmcoreinfo */
|
|
phdr = (struct elf_phdr *)bufp;
|
|
bufp += sizeof(struct elf_phdr);
|
|
phdr->p_type = PT_NOTE;
|
|
phdr->p_flags = 0;
|
|
phdr->p_vaddr = 0;
|
|
phdr->p_align = 0;
|
|
|
|
phdr->p_paddr = fadump_relocate(paddr_vmcoreinfo_note());
|
|
phdr->p_offset = phdr->p_paddr;
|
|
phdr->p_memsz = vmcoreinfo_max_size;
|
|
phdr->p_filesz = vmcoreinfo_max_size;
|
|
|
|
/* Increment number of program headers. */
|
|
(elf->e_phnum)++;
|
|
|
|
/* setup PT_LOAD sections. */
|
|
|
|
for (i = 0; i < crash_mem_ranges; i++) {
|
|
unsigned long long mbase, msize;
|
|
mbase = crash_memory_ranges[i].base;
|
|
msize = crash_memory_ranges[i].size;
|
|
|
|
if (!msize)
|
|
continue;
|
|
|
|
phdr = (struct elf_phdr *)bufp;
|
|
bufp += sizeof(struct elf_phdr);
|
|
phdr->p_type = PT_LOAD;
|
|
phdr->p_flags = PF_R|PF_W|PF_X;
|
|
phdr->p_offset = mbase;
|
|
|
|
if (mbase == RMA_START) {
|
|
/*
|
|
* The entire RMA region will be moved by firmware
|
|
* to the specified destination_address. Hence set
|
|
* the correct offset.
|
|
*/
|
|
phdr->p_offset = fdm.rmr_region.destination_address;
|
|
}
|
|
|
|
phdr->p_paddr = mbase;
|
|
phdr->p_vaddr = (unsigned long)__va(mbase);
|
|
phdr->p_filesz = msize;
|
|
phdr->p_memsz = msize;
|
|
phdr->p_align = 0;
|
|
|
|
/* Increment number of program headers. */
|
|
(elf->e_phnum)++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static unsigned long init_fadump_header(unsigned long addr)
|
|
{
|
|
struct fadump_crash_info_header *fdh;
|
|
|
|
if (!addr)
|
|
return 0;
|
|
|
|
fw_dump.fadumphdr_addr = addr;
|
|
fdh = __va(addr);
|
|
addr += sizeof(struct fadump_crash_info_header);
|
|
|
|
memset(fdh, 0, sizeof(struct fadump_crash_info_header));
|
|
fdh->magic_number = FADUMP_CRASH_INFO_MAGIC;
|
|
fdh->elfcorehdr_addr = addr;
|
|
/* We will set the crashing cpu id in crash_fadump() during crash. */
|
|
fdh->crashing_cpu = CPU_UNKNOWN;
|
|
|
|
return addr;
|
|
}
|
|
|
|
static void register_fadump(void)
|
|
{
|
|
unsigned long addr;
|
|
void *vaddr;
|
|
|
|
/*
|
|
* If no memory is reserved then we can not register for firmware-
|
|
* assisted dump.
|
|
*/
|
|
if (!fw_dump.reserve_dump_area_size)
|
|
return;
|
|
|
|
fadump_setup_crash_memory_ranges();
|
|
|
|
addr = fdm.rmr_region.destination_address + fdm.rmr_region.source_len;
|
|
/* Initialize fadump crash info header. */
|
|
addr = init_fadump_header(addr);
|
|
vaddr = __va(addr);
|
|
|
|
pr_debug("Creating ELF core headers at %#016lx\n", addr);
|
|
fadump_create_elfcore_headers(vaddr);
|
|
|
|
/* register the future kernel dump with firmware. */
|
|
register_fw_dump(&fdm);
|
|
}
|
|
|
|
static int fadump_unregister_dump(struct fadump_mem_struct *fdm)
|
|
{
|
|
int rc = 0;
|
|
unsigned int wait_time;
|
|
|
|
pr_debug("Un-register firmware-assisted dump\n");
|
|
|
|
/* TODO: Add upper time limit for the delay */
|
|
do {
|
|
rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
|
|
FADUMP_UNREGISTER, fdm,
|
|
sizeof(struct fadump_mem_struct));
|
|
|
|
wait_time = rtas_busy_delay_time(rc);
|
|
if (wait_time)
|
|
mdelay(wait_time);
|
|
} while (wait_time);
|
|
|
|
if (rc) {
|
|
printk(KERN_ERR "Failed to un-register firmware-assisted dump."
|
|
" unexpected error(%d).\n", rc);
|
|
return rc;
|
|
}
|
|
fw_dump.dump_registered = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int fadump_invalidate_dump(struct fadump_mem_struct *fdm)
|
|
{
|
|
int rc = 0;
|
|
unsigned int wait_time;
|
|
|
|
pr_debug("Invalidating firmware-assisted dump registration\n");
|
|
|
|
/* TODO: Add upper time limit for the delay */
|
|
do {
|
|
rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
|
|
FADUMP_INVALIDATE, fdm,
|
|
sizeof(struct fadump_mem_struct));
|
|
|
|
wait_time = rtas_busy_delay_time(rc);
|
|
if (wait_time)
|
|
mdelay(wait_time);
|
|
} while (wait_time);
|
|
|
|
if (rc) {
|
|
printk(KERN_ERR "Failed to invalidate firmware-assisted dump "
|
|
"rgistration. unexpected error(%d).\n", rc);
|
|
return rc;
|
|
}
|
|
fw_dump.dump_active = 0;
|
|
fdm_active = NULL;
|
|
return 0;
|
|
}
|
|
|
|
void fadump_cleanup(void)
|
|
{
|
|
/* Invalidate the registration only if dump is active. */
|
|
if (fw_dump.dump_active) {
|
|
init_fadump_mem_struct(&fdm,
|
|
fdm_active->cpu_state_data.destination_address);
|
|
fadump_invalidate_dump(&fdm);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Release the memory that was reserved in early boot to preserve the memory
|
|
* contents. The released memory will be available for general use.
|
|
*/
|
|
static void fadump_release_memory(unsigned long begin, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
unsigned long ra_start, ra_end;
|
|
|
|
ra_start = fw_dump.reserve_dump_area_start;
|
|
ra_end = ra_start + fw_dump.reserve_dump_area_size;
|
|
|
|
for (addr = begin; addr < end; addr += PAGE_SIZE) {
|
|
/*
|
|
* exclude the dump reserve area. Will reuse it for next
|
|
* fadump registration.
|
|
*/
|
|
if (addr <= ra_end && ((addr + PAGE_SIZE) > ra_start))
|
|
continue;
|
|
|
|
ClearPageReserved(pfn_to_page(addr >> PAGE_SHIFT));
|
|
init_page_count(pfn_to_page(addr >> PAGE_SHIFT));
|
|
free_page((unsigned long)__va(addr));
|
|
totalram_pages++;
|
|
}
|
|
}
|
|
|
|
static void fadump_invalidate_release_mem(void)
|
|
{
|
|
unsigned long reserved_area_start, reserved_area_end;
|
|
unsigned long destination_address;
|
|
|
|
mutex_lock(&fadump_mutex);
|
|
if (!fw_dump.dump_active) {
|
|
mutex_unlock(&fadump_mutex);
|
|
return;
|
|
}
|
|
|
|
destination_address = fdm_active->cpu_state_data.destination_address;
|
|
fadump_cleanup();
|
|
mutex_unlock(&fadump_mutex);
|
|
|
|
/*
|
|
* Save the current reserved memory bounds we will require them
|
|
* later for releasing the memory for general use.
|
|
*/
|
|
reserved_area_start = fw_dump.reserve_dump_area_start;
|
|
reserved_area_end = reserved_area_start +
|
|
fw_dump.reserve_dump_area_size;
|
|
/*
|
|
* Setup reserve_dump_area_start and its size so that we can
|
|
* reuse this reserved memory for Re-registration.
|
|
*/
|
|
fw_dump.reserve_dump_area_start = destination_address;
|
|
fw_dump.reserve_dump_area_size = get_fadump_area_size();
|
|
|
|
fadump_release_memory(reserved_area_start, reserved_area_end);
|
|
if (fw_dump.cpu_notes_buf) {
|
|
fadump_cpu_notes_buf_free(
|
|
(unsigned long)__va(fw_dump.cpu_notes_buf),
|
|
fw_dump.cpu_notes_buf_size);
|
|
fw_dump.cpu_notes_buf = 0;
|
|
fw_dump.cpu_notes_buf_size = 0;
|
|
}
|
|
/* Initialize the kernel dump memory structure for FAD registration. */
|
|
init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start);
|
|
}
|
|
|
|
static ssize_t fadump_release_memory_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
if (!fw_dump.dump_active)
|
|
return -EPERM;
|
|
|
|
if (buf[0] == '1') {
|
|
/*
|
|
* Take away the '/proc/vmcore'. We are releasing the dump
|
|
* memory, hence it will not be valid anymore.
|
|
*/
|
|
vmcore_cleanup();
|
|
fadump_invalidate_release_mem();
|
|
|
|
} else
|
|
return -EINVAL;
|
|
return count;
|
|
}
|
|
|
|
static ssize_t fadump_enabled_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", fw_dump.fadump_enabled);
|
|
}
|
|
|
|
static ssize_t fadump_register_show(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
char *buf)
|
|
{
|
|
return sprintf(buf, "%d\n", fw_dump.dump_registered);
|
|
}
|
|
|
|
static ssize_t fadump_register_store(struct kobject *kobj,
|
|
struct kobj_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!fw_dump.fadump_enabled || fdm_active)
|
|
return -EPERM;
|
|
|
|
mutex_lock(&fadump_mutex);
|
|
|
|
switch (buf[0]) {
|
|
case '0':
|
|
if (fw_dump.dump_registered == 0) {
|
|
ret = -EINVAL;
|
|
goto unlock_out;
|
|
}
|
|
/* Un-register Firmware-assisted dump */
|
|
fadump_unregister_dump(&fdm);
|
|
break;
|
|
case '1':
|
|
if (fw_dump.dump_registered == 1) {
|
|
ret = -EINVAL;
|
|
goto unlock_out;
|
|
}
|
|
/* Register Firmware-assisted dump */
|
|
register_fadump();
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
unlock_out:
|
|
mutex_unlock(&fadump_mutex);
|
|
return ret < 0 ? ret : count;
|
|
}
|
|
|
|
static int fadump_region_show(struct seq_file *m, void *private)
|
|
{
|
|
const struct fadump_mem_struct *fdm_ptr;
|
|
|
|
if (!fw_dump.fadump_enabled)
|
|
return 0;
|
|
|
|
mutex_lock(&fadump_mutex);
|
|
if (fdm_active)
|
|
fdm_ptr = fdm_active;
|
|
else {
|
|
mutex_unlock(&fadump_mutex);
|
|
fdm_ptr = &fdm;
|
|
}
|
|
|
|
seq_printf(m,
|
|
"CPU : [%#016llx-%#016llx] %#llx bytes, "
|
|
"Dumped: %#llx\n",
|
|
fdm_ptr->cpu_state_data.destination_address,
|
|
fdm_ptr->cpu_state_data.destination_address +
|
|
fdm_ptr->cpu_state_data.source_len - 1,
|
|
fdm_ptr->cpu_state_data.source_len,
|
|
fdm_ptr->cpu_state_data.bytes_dumped);
|
|
seq_printf(m,
|
|
"HPTE: [%#016llx-%#016llx] %#llx bytes, "
|
|
"Dumped: %#llx\n",
|
|
fdm_ptr->hpte_region.destination_address,
|
|
fdm_ptr->hpte_region.destination_address +
|
|
fdm_ptr->hpte_region.source_len - 1,
|
|
fdm_ptr->hpte_region.source_len,
|
|
fdm_ptr->hpte_region.bytes_dumped);
|
|
seq_printf(m,
|
|
"DUMP: [%#016llx-%#016llx] %#llx bytes, "
|
|
"Dumped: %#llx\n",
|
|
fdm_ptr->rmr_region.destination_address,
|
|
fdm_ptr->rmr_region.destination_address +
|
|
fdm_ptr->rmr_region.source_len - 1,
|
|
fdm_ptr->rmr_region.source_len,
|
|
fdm_ptr->rmr_region.bytes_dumped);
|
|
|
|
if (!fdm_active ||
|
|
(fw_dump.reserve_dump_area_start ==
|
|
fdm_ptr->cpu_state_data.destination_address))
|
|
goto out;
|
|
|
|
/* Dump is active. Show reserved memory region. */
|
|
seq_printf(m,
|
|
" : [%#016llx-%#016llx] %#llx bytes, "
|
|
"Dumped: %#llx\n",
|
|
(unsigned long long)fw_dump.reserve_dump_area_start,
|
|
fdm_ptr->cpu_state_data.destination_address - 1,
|
|
fdm_ptr->cpu_state_data.destination_address -
|
|
fw_dump.reserve_dump_area_start,
|
|
fdm_ptr->cpu_state_data.destination_address -
|
|
fw_dump.reserve_dump_area_start);
|
|
out:
|
|
if (fdm_active)
|
|
mutex_unlock(&fadump_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static struct kobj_attribute fadump_release_attr = __ATTR(fadump_release_mem,
|
|
0200, NULL,
|
|
fadump_release_memory_store);
|
|
static struct kobj_attribute fadump_attr = __ATTR(fadump_enabled,
|
|
0444, fadump_enabled_show,
|
|
NULL);
|
|
static struct kobj_attribute fadump_register_attr = __ATTR(fadump_registered,
|
|
0644, fadump_register_show,
|
|
fadump_register_store);
|
|
|
|
static int fadump_region_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, fadump_region_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations fadump_region_fops = {
|
|
.open = fadump_region_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static void fadump_init_files(void)
|
|
{
|
|
struct dentry *debugfs_file;
|
|
int rc = 0;
|
|
|
|
rc = sysfs_create_file(kernel_kobj, &fadump_attr.attr);
|
|
if (rc)
|
|
printk(KERN_ERR "fadump: unable to create sysfs file"
|
|
" fadump_enabled (%d)\n", rc);
|
|
|
|
rc = sysfs_create_file(kernel_kobj, &fadump_register_attr.attr);
|
|
if (rc)
|
|
printk(KERN_ERR "fadump: unable to create sysfs file"
|
|
" fadump_registered (%d)\n", rc);
|
|
|
|
debugfs_file = debugfs_create_file("fadump_region", 0444,
|
|
powerpc_debugfs_root, NULL,
|
|
&fadump_region_fops);
|
|
if (!debugfs_file)
|
|
printk(KERN_ERR "fadump: unable to create debugfs file"
|
|
" fadump_region\n");
|
|
|
|
if (fw_dump.dump_active) {
|
|
rc = sysfs_create_file(kernel_kobj, &fadump_release_attr.attr);
|
|
if (rc)
|
|
printk(KERN_ERR "fadump: unable to create sysfs file"
|
|
" fadump_release_mem (%d)\n", rc);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Prepare for firmware-assisted dump.
|
|
*/
|
|
int __init setup_fadump(void)
|
|
{
|
|
if (!fw_dump.fadump_enabled)
|
|
return 0;
|
|
|
|
if (!fw_dump.fadump_supported) {
|
|
printk(KERN_ERR "Firmware-assisted dump is not supported on"
|
|
" this hardware\n");
|
|
return 0;
|
|
}
|
|
|
|
fadump_show_config();
|
|
/*
|
|
* If dump data is available then see if it is valid and prepare for
|
|
* saving it to the disk.
|
|
*/
|
|
if (fw_dump.dump_active) {
|
|
/*
|
|
* if dump process fails then invalidate the registration
|
|
* and release memory before proceeding for re-registration.
|
|
*/
|
|
if (process_fadump(fdm_active) < 0)
|
|
fadump_invalidate_release_mem();
|
|
}
|
|
/* Initialize the kernel dump memory structure for FAD registration. */
|
|
else if (fw_dump.reserve_dump_area_size)
|
|
init_fadump_mem_struct(&fdm, fw_dump.reserve_dump_area_start);
|
|
fadump_init_files();
|
|
|
|
return 1;
|
|
}
|
|
subsys_initcall(setup_fadump);
|