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For fadump case, passing additional parameters to dump capture kernel helps in minimizing the memory footprint for it and also provides the flexibility to disable components/modules, like hugepages, that are hindering the boot process of the special dump capture environment. Set up a dedicated parameter area to be passed to the capture kernel. This area type is defined as RTAS_FADUMP_PARAM_AREA. Sysfs attribute '/sys/kernel/fadump/bootargs_append' is exported to the userspace to specify the additional parameters to be passed to the capture kernel Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://msgid.link/20240509115755.519982-3-hbathini@linux.ibm.com
121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Firmware-Assisted Dump support on POWERVM platform.
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*
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* Copyright 2011, Mahesh Salgaonkar, IBM Corporation.
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* Copyright 2019, Hari Bathini, IBM Corporation.
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*/
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#ifndef _PSERIES_RTAS_FADUMP_H
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#define _PSERIES_RTAS_FADUMP_H
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/*
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* On some Power systems where RMO is 128MB, it still requires minimum of
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* 256MB for kernel to boot successfully. When kdump infrastructure is
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* configured to save vmcore over network, we run into OOM issue while
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* loading modules related to network setup. Hence we need additional 64M
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* of memory to avoid OOM issue.
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*/
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#define RTAS_FADUMP_MIN_BOOT_MEM ((0x1UL << 28) + (0x1UL << 26))
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/* Firmware provided dump sections */
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#define RTAS_FADUMP_CPU_STATE_DATA 0x0001
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#define RTAS_FADUMP_HPTE_REGION 0x0002
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#define RTAS_FADUMP_REAL_MODE_REGION 0x0011
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/* OS defined sections */
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#define RTAS_FADUMP_PARAM_AREA 0x0100
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/* Dump request flag */
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#define RTAS_FADUMP_REQUEST_FLAG 0x00000001
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/* Dump status flag */
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#define RTAS_FADUMP_ERROR_FLAG 0x2000
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/*
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* The Firmware Assisted Dump Memory structure supports a maximum of 10 sections
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* in the dump memory structure. Presently, three sections are used for
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* CPU state data, HPTE & Parameters area, while the remaining seven sections
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* can be used for boot memory regions.
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*/
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#define MAX_SECTIONS 10
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#define RTAS_FADUMP_MAX_BOOT_MEM_REGS 7
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/* Kernel Dump section info */
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struct rtas_fadump_section {
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__be32 request_flag;
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__be16 source_data_type;
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__be16 error_flags;
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__be64 source_address;
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__be64 source_len;
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__be64 bytes_dumped;
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__be64 destination_address;
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};
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/* ibm,configure-kernel-dump header. */
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struct rtas_fadump_section_header {
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__be32 dump_format_version;
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__be16 dump_num_sections;
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__be16 dump_status_flag;
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__be32 offset_first_dump_section;
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/* Fields for disk dump option. */
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__be32 dd_block_size;
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__be64 dd_block_offset;
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__be64 dd_num_blocks;
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__be32 dd_offset_disk_path;
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/* Maximum time allowed to prevent an automatic dump-reboot. */
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__be32 max_time_auto;
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};
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/*
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* Firmware Assisted dump memory structure. This structure is required for
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* registering future kernel dump with power firmware through rtas call.
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*
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* In version 1, the platform permits one section header, dump-disk path
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* and ten sections.
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*
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* Note: No disk dump option. Hence disk dump path string section is not
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* included.
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*/
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struct rtas_fadump_mem_struct {
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struct rtas_fadump_section_header header;
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struct rtas_fadump_section rgn[MAX_SECTIONS];
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};
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/*
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* The firmware-assisted dump format.
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*
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* The register save area is an area in the partition's memory used to preserve
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* the register contents (CPU state data) for the active CPUs during a firmware
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* assisted dump. The dump format contains register save area header followed
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* by register entries. Each list of registers for a CPU starts with "CPUSTRT"
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* and ends with "CPUEND".
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*/
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/* Register save area header. */
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struct rtas_fadump_reg_save_area_header {
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__be64 magic_number;
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__be32 version;
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__be32 num_cpu_offset;
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};
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/* Register entry. */
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struct rtas_fadump_reg_entry {
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__be64 reg_id;
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__be64 reg_value;
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};
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/* Utility macros */
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#define RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry) \
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({ \
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while (be64_to_cpu(reg_entry->reg_id) != \
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fadump_str_to_u64("CPUEND")) \
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reg_entry++; \
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reg_entry++; \
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})
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#define RTAS_FADUMP_CPU_ID_MASK ((1UL << 32) - 1)
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#endif /* _PSERIES_RTAS_FADUMP_H */
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