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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Firmware-Assisted Dump internal code.
*
* Copyright 2011, Mahesh Salgaonkar, IBM Corporation.
* Copyright 2019, Hari Bathini, IBM Corporation.
*/
#ifndef _ASM_POWERPC_FADUMP_INTERNAL_H
#define _ASM_POWERPC_FADUMP_INTERNAL_H
/*
* The RMA region will be saved for later dumping when kernel crashes.
* RMA is Real Mode Area, the first block of logical memory address owned
* by logical partition, containing the storage that may be accessed with
* translate off.
*/
#define RMA_START 0x0
#define RMA_END (ppc64_rma_size)
/*
* On some Power systems where RMO is 128MB, it still requires minimum of
* 256MB for kernel to boot successfully. When kdump infrastructure is
* configured to save vmcore over network, we run into OOM issue while
* loading modules related to network setup. Hence we need additional 64M
* of memory to avoid OOM issue.
*/
#define MIN_BOOT_MEM (((RMA_END < (0x1UL << 28)) ? (0x1UL << 28) : RMA_END) \
+ (0x1UL << 26))
/* The upper limit percentage for user specified boot memory size (25%) */
#define MAX_BOOT_MEM_RATIO 4
#define memblock_num_regions(memblock_type) (memblock.memblock_type.cnt)
/* Alignment per CMA requirement. */
#define FADUMP_CMA_ALIGNMENT (PAGE_SIZE << \
max_t(unsigned long, MAX_ORDER - 1, \
pageblock_order))
/* FAD commands */
#define FADUMP_REGISTER 1
#define FADUMP_UNREGISTER 2
#define FADUMP_INVALIDATE 3
/*
* Copy the ascii values for first 8 characters from a string into u64
* variable at their respective indexes.
* e.g.
* The string "FADMPINF" will be converted into 0x4641444d50494e46
*/
static inline u64 fadump_str_to_u64(const char *str)
{
u64 val = 0;
int i;
for (i = 0; i < sizeof(val); i++)
val = (*str) ? (val << 8) | *str++ : val << 8;
return val;
}
#define FADUMP_CPU_UNKNOWN (~((u32)0))
#define FADUMP_CRASH_INFO_MAGIC fadump_str_to_u64("FADMPINF")
/* fadump crash info structure */
struct fadump_crash_info_header {
u64 magic_number;
u64 elfcorehdr_addr;
u32 crashing_cpu;
struct pt_regs regs;
struct cpumask online_mask;
};
struct fad_crash_memory_ranges {
unsigned long long base;
unsigned long long size;
};
/* Platform specific callback functions */
struct fadump_ops;
/* Firmware-assisted dump configuration details. */
struct fw_dump {
unsigned long reserve_dump_area_start;
unsigned long reserve_dump_area_size;
/* cmd line option during boot */
unsigned long reserve_bootvar;
unsigned long cpu_state_data_size;
unsigned long hpte_region_size;
unsigned long boot_memory_size;
u64 boot_mem_dest_addr;
unsigned long fadumphdr_addr;
unsigned long cpu_notes_buf_vaddr;
unsigned long cpu_notes_buf_size;
int ibm_configure_kernel_dump;
unsigned long fadump_enabled:1;
unsigned long fadump_supported:1;
unsigned long dump_active:1;
unsigned long dump_registered:1;
unsigned long nocma:1;
struct fadump_ops *ops;
};
struct fadump_ops {
u64 (*fadump_init_mem_struct)(struct fw_dump *fadump_conf);
int (*fadump_register)(struct fw_dump *fadump_conf);
int (*fadump_unregister)(struct fw_dump *fadump_conf);
int (*fadump_invalidate)(struct fw_dump *fadump_conf);
int (*fadump_process)(struct fw_dump *fadump_conf);
void (*fadump_region_show)(struct fw_dump *fadump_conf,
struct seq_file *m);
void (*fadump_trigger)(struct fadump_crash_info_header *fdh,
const char *msg);
};
/* Helper functions */
s32 fadump_setup_cpu_notes_buf(u32 num_cpus);
void fadump_free_cpu_notes_buf(void);
u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs);
void fadump_update_elfcore_header(char *bufp);
bool is_fadump_boot_mem_contiguous(void);
bool is_fadump_reserved_mem_contiguous(void);
#ifdef CONFIG_PPC_PSERIES
extern void rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node);
#else
static inline void
rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node) { }
#endif
#endif /* _ASM_POWERPC_FADUMP_INTERNAL_H */
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