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7dee93a9a8
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
169 lines
4.3 KiB
C
169 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Firmware-Assisted Dump internal code.
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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 _ASM_POWERPC_FADUMP_INTERNAL_H
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#define _ASM_POWERPC_FADUMP_INTERNAL_H
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/* Maximum number of memory regions kernel supports */
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#define FADUMP_MAX_MEM_REGS 128
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#ifndef CONFIG_PRESERVE_FA_DUMP
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/* The upper limit percentage for user specified boot memory size (25%) */
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#define MAX_BOOT_MEM_RATIO 4
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#define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt)
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/* Alignment per CMA requirement. */
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#define FADUMP_CMA_ALIGNMENT (PAGE_SIZE << \
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max_t(unsigned long, MAX_ORDER - 1, \
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pageblock_order))
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/* FAD commands */
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#define FADUMP_REGISTER 1
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#define FADUMP_UNREGISTER 2
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#define FADUMP_INVALIDATE 3
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/*
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* Copy the ascii values for first 8 characters from a string into u64
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* variable at their respective indexes.
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* e.g.
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* The string "FADMPINF" will be converted into 0x4641444d50494e46
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*/
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static inline u64 fadump_str_to_u64(const char *str)
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{
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u64 val = 0;
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int i;
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for (i = 0; i < sizeof(val); i++)
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val = (*str) ? (val << 8) | *str++ : val << 8;
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return val;
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}
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#define FADUMP_CPU_UNKNOWN (~((u32)0))
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#define FADUMP_CRASH_INFO_MAGIC fadump_str_to_u64("FADMPINF")
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/* fadump crash info structure */
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struct fadump_crash_info_header {
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u64 magic_number;
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u64 elfcorehdr_addr;
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u32 crashing_cpu;
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struct pt_regs regs;
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struct cpumask online_mask;
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};
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struct fadump_memory_range {
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u64 base;
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u64 size;
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};
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/* fadump memory ranges info */
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struct fadump_mrange_info {
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char name[16];
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struct fadump_memory_range *mem_ranges;
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u32 mem_ranges_sz;
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u32 mem_range_cnt;
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u32 max_mem_ranges;
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};
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/* Platform specific callback functions */
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struct fadump_ops;
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/* Firmware-assisted dump configuration details. */
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struct fw_dump {
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unsigned long reserve_dump_area_start;
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unsigned long reserve_dump_area_size;
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/* cmd line option during boot */
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unsigned long reserve_bootvar;
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unsigned long cpu_state_data_size;
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u64 cpu_state_dest_vaddr;
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u32 cpu_state_data_version;
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u32 cpu_state_entry_size;
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unsigned long hpte_region_size;
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unsigned long boot_memory_size;
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u64 boot_mem_dest_addr;
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u64 boot_mem_addr[FADUMP_MAX_MEM_REGS];
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u64 boot_mem_sz[FADUMP_MAX_MEM_REGS];
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u64 boot_mem_top;
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u64 boot_mem_regs_cnt;
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unsigned long fadumphdr_addr;
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unsigned long cpu_notes_buf_vaddr;
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unsigned long cpu_notes_buf_size;
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/*
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* Maximum size supported by firmware to copy from source to
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* destination address per entry.
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*/
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u64 max_copy_size;
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u64 kernel_metadata;
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int ibm_configure_kernel_dump;
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unsigned long fadump_enabled:1;
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unsigned long fadump_supported:1;
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unsigned long dump_active:1;
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unsigned long dump_registered:1;
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unsigned long nocma:1;
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struct fadump_ops *ops;
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};
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struct fadump_ops {
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u64 (*fadump_init_mem_struct)(struct fw_dump *fadump_conf);
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u64 (*fadump_get_metadata_size)(void);
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int (*fadump_setup_metadata)(struct fw_dump *fadump_conf);
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u64 (*fadump_get_bootmem_min)(void);
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int (*fadump_register)(struct fw_dump *fadump_conf);
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int (*fadump_unregister)(struct fw_dump *fadump_conf);
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int (*fadump_invalidate)(struct fw_dump *fadump_conf);
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void (*fadump_cleanup)(struct fw_dump *fadump_conf);
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int (*fadump_process)(struct fw_dump *fadump_conf);
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void (*fadump_region_show)(struct fw_dump *fadump_conf,
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struct seq_file *m);
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void (*fadump_trigger)(struct fadump_crash_info_header *fdh,
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const char *msg);
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};
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/* Helper functions */
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s32 fadump_setup_cpu_notes_buf(u32 num_cpus);
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void fadump_free_cpu_notes_buf(void);
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u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs);
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void fadump_update_elfcore_header(char *bufp);
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bool is_fadump_boot_mem_contiguous(void);
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bool is_fadump_reserved_mem_contiguous(void);
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#else /* !CONFIG_PRESERVE_FA_DUMP */
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/* Firmware-assisted dump configuration details. */
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struct fw_dump {
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u64 boot_mem_top;
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u64 dump_active;
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};
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#endif /* CONFIG_PRESERVE_FA_DUMP */
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#ifdef CONFIG_PPC_PSERIES
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extern void rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
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#else
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static inline void
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rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
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#endif
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#ifdef CONFIG_PPC_POWERNV
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extern void opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
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#else
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static inline void
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opal_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
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#endif
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#endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */
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