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With support to copy multiple kernel boot memory regions owing to copy size limitation, also handle holes in the memory area to be preserved. Support as many as 128 kernel boot memory regions. This allows having an adequate FADump capture kernel size for different scenarios. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821385448.5656.6124791213910877759.stgit@hbathini.in.ibm.com
114 lines
3.1 KiB
C
114 lines
3.1 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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/* 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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/* 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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* No disk dump option. Hence disk dump path string section is not 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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/* Kernel dump sections */
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struct rtas_fadump_section cpu_state_data;
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struct rtas_fadump_section hpte_region;
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/*
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* TODO: Extend multiple boot memory regions support in the kernel
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* for this platform.
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*/
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struct rtas_fadump_section rmr_region;
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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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