cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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rtas-fadump.h (3148B)

      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Firmware-Assisted Dump support on POWERVM platform.
      4 *
      5 * Copyright 2011, Mahesh Salgaonkar, IBM Corporation.
      6 * Copyright 2019, Hari Bathini, IBM Corporation.
      7 */
      8
      9#ifndef _PSERIES_RTAS_FADUMP_H
     10#define _PSERIES_RTAS_FADUMP_H
     11
     12/*
     13 * On some Power systems where RMO is 128MB, it still requires minimum of
     14 * 256MB for kernel to boot successfully. When kdump infrastructure is
     15 * configured to save vmcore over network, we run into OOM issue while
     16 * loading modules related to network setup. Hence we need additional 64M
     17 * of memory to avoid OOM issue.
     18 */
     19#define RTAS_FADUMP_MIN_BOOT_MEM	((0x1UL << 28) + (0x1UL << 26))
     20
     21/* Firmware provided dump sections */
     22#define RTAS_FADUMP_CPU_STATE_DATA	0x0001
     23#define RTAS_FADUMP_HPTE_REGION		0x0002
     24#define RTAS_FADUMP_REAL_MODE_REGION	0x0011
     25
     26/* Dump request flag */
     27#define RTAS_FADUMP_REQUEST_FLAG	0x00000001
     28
     29/* Dump status flag */
     30#define RTAS_FADUMP_ERROR_FLAG		0x2000
     31
     32/* Kernel Dump section info */
     33struct rtas_fadump_section {
     34	__be32	request_flag;
     35	__be16	source_data_type;
     36	__be16	error_flags;
     37	__be64	source_address;
     38	__be64	source_len;
     39	__be64	bytes_dumped;
     40	__be64	destination_address;
     41};
     42
     43/* ibm,configure-kernel-dump header. */
     44struct rtas_fadump_section_header {
     45	__be32	dump_format_version;
     46	__be16	dump_num_sections;
     47	__be16	dump_status_flag;
     48	__be32	offset_first_dump_section;
     49
     50	/* Fields for disk dump option. */
     51	__be32	dd_block_size;
     52	__be64	dd_block_offset;
     53	__be64	dd_num_blocks;
     54	__be32	dd_offset_disk_path;
     55
     56	/* Maximum time allowed to prevent an automatic dump-reboot. */
     57	__be32	max_time_auto;
     58};
     59
     60/*
     61 * Firmware Assisted dump memory structure. This structure is required for
     62 * registering future kernel dump with power firmware through rtas call.
     63 *
     64 * No disk dump option. Hence disk dump path string section is not included.
     65 */
     66struct rtas_fadump_mem_struct {
     67	struct rtas_fadump_section_header	header;
     68
     69	/* Kernel dump sections */
     70	struct rtas_fadump_section		cpu_state_data;
     71	struct rtas_fadump_section		hpte_region;
     72
     73	/*
     74	 * TODO: Extend multiple boot memory regions support in the kernel
     75	 *       for this platform.
     76	 */
     77	struct rtas_fadump_section		rmr_region;
     78};
     79
     80/*
     81 * The firmware-assisted dump format.
     82 *
     83 * The register save area is an area in the partition's memory used to preserve
     84 * the register contents (CPU state data) for the active CPUs during a firmware
     85 * assisted dump. The dump format contains register save area header followed
     86 * by register entries. Each list of registers for a CPU starts with "CPUSTRT"
     87 * and ends with "CPUEND".
     88 */
     89
     90/* Register save area header. */
     91struct rtas_fadump_reg_save_area_header {
     92	__be64		magic_number;
     93	__be32		version;
     94	__be32		num_cpu_offset;
     95};
     96
     97/* Register entry. */
     98struct rtas_fadump_reg_entry {
     99	__be64		reg_id;
    100	__be64		reg_value;
    101};
    102
    103/* Utility macros */
    104#define RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry)				\
    105({									\
    106	while (be64_to_cpu(reg_entry->reg_id) !=			\
    107	       fadump_str_to_u64("CPUEND"))				\
    108		reg_entry++;						\
    109	reg_entry++;							\
    110})
    111
    112#define RTAS_FADUMP_CPU_ID_MASK			((1UL << 32) - 1)
    113
    114#endif /* _PSERIES_RTAS_FADUMP_H */