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An LPAR can be terminated by the POWER Hypervisor (PHYP) for various reasons. If FADump was configured when PHYP terminates the LPAR, platform-assisted dump is initiated to save the kernel dump. But CPU register data would not be processed/saved in the vmcore in such case because CPU mask is set in crash_fadump() at the time of kernel crash and it remains unset in this case with LPAR being terminated by PHYP abruptly. To get around the problem, initialize cpu_mask to cpu_possible_mask so as to ensure all possible CPUs' register data is processed for the vmcore generated on PHYP terminated LPAR. Also, rename the crash info member variable from online_mask to cpu_mask as it doesn't necessarily have to be online CPU mask always. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Reviewed-by: Mahesh Salgaonkar <mahesh@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20220404182137.59231-1-hbathini@linux.ibm.com
166 lines
4.3 KiB
C
166 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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/* 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 cpu_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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#define RNG_NAME_SZ 16
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struct fadump_mrange_info {
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char name[RNG_NAME_SZ];
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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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bool is_static;
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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 __init fadump_setup_cpu_notes_buf(u32 num_cpus);
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void fadump_free_cpu_notes_buf(void);
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u32 *__init fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs);
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void __init 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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