558 lines
16 KiB
C
558 lines
16 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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#define pr_fmt(fmt) "rtas fadump: " fmt
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#include <linux/string.h>
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#include <linux/memblock.h>
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#include <linux/delay.h>
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#include <linux/seq_file.h>
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#include <linux/crash_dump.h>
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#include <linux/of.h>
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#include <linux/of_fdt.h>
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#include <asm/page.h>
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#include <asm/rtas.h>
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#include <asm/fadump.h>
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#include <asm/fadump-internal.h>
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#include "rtas-fadump.h"
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static struct rtas_fadump_mem_struct fdm;
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static const struct rtas_fadump_mem_struct *fdm_active;
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static void rtas_fadump_update_config(struct fw_dump *fadump_conf,
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const struct rtas_fadump_mem_struct *fdm)
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{
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fadump_conf->boot_mem_dest_addr =
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be64_to_cpu(fdm->rmr_region.destination_address);
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fadump_conf->fadumphdr_addr = (fadump_conf->boot_mem_dest_addr +
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fadump_conf->boot_memory_size);
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}
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/*
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* This function is called in the capture kernel to get configuration details
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* setup in the first kernel and passed to the f/w.
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*/
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static void __init rtas_fadump_get_config(struct fw_dump *fadump_conf,
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const struct rtas_fadump_mem_struct *fdm)
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{
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fadump_conf->boot_mem_addr[0] =
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be64_to_cpu(fdm->rmr_region.source_address);
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fadump_conf->boot_mem_sz[0] = be64_to_cpu(fdm->rmr_region.source_len);
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fadump_conf->boot_memory_size = fadump_conf->boot_mem_sz[0];
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fadump_conf->boot_mem_top = fadump_conf->boot_memory_size;
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fadump_conf->boot_mem_regs_cnt = 1;
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/*
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* Start address of reserve dump area (permanent reservation) for
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* re-registering FADump after dump capture.
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*/
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fadump_conf->reserve_dump_area_start =
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be64_to_cpu(fdm->cpu_state_data.destination_address);
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rtas_fadump_update_config(fadump_conf, fdm);
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}
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static u64 rtas_fadump_init_mem_struct(struct fw_dump *fadump_conf)
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{
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u64 addr = fadump_conf->reserve_dump_area_start;
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memset(&fdm, 0, sizeof(struct rtas_fadump_mem_struct));
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addr = addr & PAGE_MASK;
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fdm.header.dump_format_version = cpu_to_be32(0x00000001);
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fdm.header.dump_num_sections = cpu_to_be16(3);
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fdm.header.dump_status_flag = 0;
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fdm.header.offset_first_dump_section =
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cpu_to_be32((u32)offsetof(struct rtas_fadump_mem_struct,
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cpu_state_data));
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/*
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* Fields for disk dump option.
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* We are not using disk dump option, hence set these fields to 0.
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*/
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fdm.header.dd_block_size = 0;
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fdm.header.dd_block_offset = 0;
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fdm.header.dd_num_blocks = 0;
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fdm.header.dd_offset_disk_path = 0;
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/* set 0 to disable an automatic dump-reboot. */
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fdm.header.max_time_auto = 0;
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/* Kernel dump sections */
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/* cpu state data section. */
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fdm.cpu_state_data.request_flag =
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cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
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fdm.cpu_state_data.source_data_type =
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cpu_to_be16(RTAS_FADUMP_CPU_STATE_DATA);
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fdm.cpu_state_data.source_address = 0;
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fdm.cpu_state_data.source_len =
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cpu_to_be64(fadump_conf->cpu_state_data_size);
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fdm.cpu_state_data.destination_address = cpu_to_be64(addr);
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addr += fadump_conf->cpu_state_data_size;
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/* hpte region section */
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fdm.hpte_region.request_flag = cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
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fdm.hpte_region.source_data_type =
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cpu_to_be16(RTAS_FADUMP_HPTE_REGION);
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fdm.hpte_region.source_address = 0;
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fdm.hpte_region.source_len =
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cpu_to_be64(fadump_conf->hpte_region_size);
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fdm.hpte_region.destination_address = cpu_to_be64(addr);
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addr += fadump_conf->hpte_region_size;
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/*
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* Align boot memory area destination address to page boundary to
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* be able to mmap read this area in the vmcore.
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*/
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addr = PAGE_ALIGN(addr);
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/* RMA region section */
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fdm.rmr_region.request_flag = cpu_to_be32(RTAS_FADUMP_REQUEST_FLAG);
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fdm.rmr_region.source_data_type =
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cpu_to_be16(RTAS_FADUMP_REAL_MODE_REGION);
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fdm.rmr_region.source_address = cpu_to_be64(0);
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fdm.rmr_region.source_len = cpu_to_be64(fadump_conf->boot_memory_size);
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fdm.rmr_region.destination_address = cpu_to_be64(addr);
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addr += fadump_conf->boot_memory_size;
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rtas_fadump_update_config(fadump_conf, &fdm);
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return addr;
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}
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static u64 rtas_fadump_get_bootmem_min(void)
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{
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return RTAS_FADUMP_MIN_BOOT_MEM;
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}
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static int rtas_fadump_register(struct fw_dump *fadump_conf)
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{
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unsigned int wait_time;
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int rc, err = -EIO;
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/* TODO: Add upper time limit for the delay */
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do {
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rc = rtas_call(fadump_conf->ibm_configure_kernel_dump, 3, 1,
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NULL, FADUMP_REGISTER, &fdm,
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sizeof(struct rtas_fadump_mem_struct));
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wait_time = rtas_busy_delay_time(rc);
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if (wait_time)
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mdelay(wait_time);
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} while (wait_time);
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switch (rc) {
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case 0:
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pr_info("Registration is successful!\n");
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fadump_conf->dump_registered = 1;
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err = 0;
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break;
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case -1:
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pr_err("Failed to register. Hardware Error(%d).\n", rc);
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break;
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case -3:
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if (!is_fadump_boot_mem_contiguous())
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pr_err("Can't have holes in boot memory area.\n");
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else if (!is_fadump_reserved_mem_contiguous())
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pr_err("Can't have holes in reserved memory area.\n");
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pr_err("Failed to register. Parameter Error(%d).\n", rc);
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err = -EINVAL;
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break;
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case -9:
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pr_err("Already registered!\n");
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fadump_conf->dump_registered = 1;
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err = -EEXIST;
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break;
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default:
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pr_err("Failed to register. Unknown Error(%d).\n", rc);
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break;
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}
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return err;
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}
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static int rtas_fadump_unregister(struct fw_dump *fadump_conf)
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{
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unsigned int wait_time;
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int rc;
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/* TODO: Add upper time limit for the delay */
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do {
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rc = rtas_call(fadump_conf->ibm_configure_kernel_dump, 3, 1,
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NULL, FADUMP_UNREGISTER, &fdm,
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sizeof(struct rtas_fadump_mem_struct));
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wait_time = rtas_busy_delay_time(rc);
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if (wait_time)
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mdelay(wait_time);
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} while (wait_time);
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if (rc) {
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pr_err("Failed to un-register - unexpected error(%d).\n", rc);
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return -EIO;
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}
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fadump_conf->dump_registered = 0;
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return 0;
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}
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static int rtas_fadump_invalidate(struct fw_dump *fadump_conf)
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{
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unsigned int wait_time;
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int rc;
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/* TODO: Add upper time limit for the delay */
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do {
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rc = rtas_call(fadump_conf->ibm_configure_kernel_dump, 3, 1,
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NULL, FADUMP_INVALIDATE, fdm_active,
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sizeof(struct rtas_fadump_mem_struct));
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wait_time = rtas_busy_delay_time(rc);
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if (wait_time)
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mdelay(wait_time);
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} while (wait_time);
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if (rc) {
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pr_err("Failed to invalidate - unexpected error (%d).\n", rc);
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return -EIO;
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}
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fadump_conf->dump_active = 0;
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fdm_active = NULL;
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return 0;
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}
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#define RTAS_FADUMP_GPR_MASK 0xffffff0000000000
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static inline int rtas_fadump_gpr_index(u64 id)
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{
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char str[3];
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int i = -1;
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if ((id & RTAS_FADUMP_GPR_MASK) == fadump_str_to_u64("GPR")) {
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/* get the digits at the end */
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id &= ~RTAS_FADUMP_GPR_MASK;
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id >>= 24;
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str[2] = '\0';
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str[1] = id & 0xff;
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str[0] = (id >> 8) & 0xff;
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if (kstrtoint(str, 10, &i))
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i = -EINVAL;
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if (i > 31)
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i = -1;
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}
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return i;
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}
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static void __init rtas_fadump_set_regval(struct pt_regs *regs, u64 reg_id, u64 reg_val)
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{
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int i;
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i = rtas_fadump_gpr_index(reg_id);
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if (i >= 0)
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regs->gpr[i] = (unsigned long)reg_val;
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else if (reg_id == fadump_str_to_u64("NIA"))
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regs->nip = (unsigned long)reg_val;
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else if (reg_id == fadump_str_to_u64("MSR"))
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regs->msr = (unsigned long)reg_val;
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else if (reg_id == fadump_str_to_u64("CTR"))
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regs->ctr = (unsigned long)reg_val;
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else if (reg_id == fadump_str_to_u64("LR"))
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regs->link = (unsigned long)reg_val;
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else if (reg_id == fadump_str_to_u64("XER"))
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regs->xer = (unsigned long)reg_val;
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else if (reg_id == fadump_str_to_u64("CR"))
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regs->ccr = (unsigned long)reg_val;
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else if (reg_id == fadump_str_to_u64("DAR"))
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regs->dar = (unsigned long)reg_val;
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else if (reg_id == fadump_str_to_u64("DSISR"))
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regs->dsisr = (unsigned long)reg_val;
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}
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static struct rtas_fadump_reg_entry* __init
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rtas_fadump_read_regs(struct rtas_fadump_reg_entry *reg_entry,
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struct pt_regs *regs)
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{
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memset(regs, 0, sizeof(struct pt_regs));
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while (be64_to_cpu(reg_entry->reg_id) != fadump_str_to_u64("CPUEND")) {
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rtas_fadump_set_regval(regs, be64_to_cpu(reg_entry->reg_id),
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be64_to_cpu(reg_entry->reg_value));
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reg_entry++;
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}
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reg_entry++;
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return reg_entry;
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}
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/*
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* Read CPU state dump data and convert it into ELF notes.
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* The CPU dump starts with magic number "REGSAVE". NumCpusOffset should be
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* used to access the data to allow for additional fields to be added without
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* affecting compatibility. Each list of registers for a CPU starts with
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* "CPUSTRT" and ends with "CPUEND". Each register entry is of 16 bytes,
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* 8 Byte ASCII identifier and 8 Byte register value. The register entry
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* with identifier "CPUSTRT" and "CPUEND" contains 4 byte cpu id as part
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* of register value. For more details refer to PAPR document.
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*
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* Only for the crashing cpu we ignore the CPU dump data and get exact
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* state from fadump crash info structure populated by first kernel at the
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* time of crash.
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*/
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static int __init rtas_fadump_build_cpu_notes(struct fw_dump *fadump_conf)
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{
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struct rtas_fadump_reg_save_area_header *reg_header;
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struct fadump_crash_info_header *fdh = NULL;
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struct rtas_fadump_reg_entry *reg_entry;
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u32 num_cpus, *note_buf;
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int i, rc = 0, cpu = 0;
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struct pt_regs regs;
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unsigned long addr;
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void *vaddr;
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addr = be64_to_cpu(fdm_active->cpu_state_data.destination_address);
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vaddr = __va(addr);
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reg_header = vaddr;
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if (be64_to_cpu(reg_header->magic_number) !=
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fadump_str_to_u64("REGSAVE")) {
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pr_err("Unable to read register save area.\n");
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return -ENOENT;
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}
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pr_debug("--------CPU State Data------------\n");
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pr_debug("Magic Number: %llx\n", be64_to_cpu(reg_header->magic_number));
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pr_debug("NumCpuOffset: %x\n", be32_to_cpu(reg_header->num_cpu_offset));
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vaddr += be32_to_cpu(reg_header->num_cpu_offset);
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num_cpus = be32_to_cpu(*((__be32 *)(vaddr)));
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pr_debug("NumCpus : %u\n", num_cpus);
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vaddr += sizeof(u32);
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reg_entry = (struct rtas_fadump_reg_entry *)vaddr;
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rc = fadump_setup_cpu_notes_buf(num_cpus);
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if (rc != 0)
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return rc;
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note_buf = (u32 *)fadump_conf->cpu_notes_buf_vaddr;
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if (fadump_conf->fadumphdr_addr)
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fdh = __va(fadump_conf->fadumphdr_addr);
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for (i = 0; i < num_cpus; i++) {
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if (be64_to_cpu(reg_entry->reg_id) !=
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fadump_str_to_u64("CPUSTRT")) {
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pr_err("Unable to read CPU state data\n");
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rc = -ENOENT;
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goto error_out;
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}
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/* Lower 4 bytes of reg_value contains logical cpu id */
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cpu = (be64_to_cpu(reg_entry->reg_value) &
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RTAS_FADUMP_CPU_ID_MASK);
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if (fdh && !cpumask_test_cpu(cpu, &fdh->cpu_mask)) {
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RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry);
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continue;
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}
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pr_debug("Reading register data for cpu %d...\n", cpu);
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if (fdh && fdh->crashing_cpu == cpu) {
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regs = fdh->regs;
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note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
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RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry);
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} else {
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reg_entry++;
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reg_entry = rtas_fadump_read_regs(reg_entry, ®s);
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note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
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}
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}
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final_note(note_buf);
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if (fdh) {
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pr_debug("Updating elfcore header (%llx) with cpu notes\n",
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fdh->elfcorehdr_addr);
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fadump_update_elfcore_header(__va(fdh->elfcorehdr_addr));
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}
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return 0;
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error_out:
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fadump_free_cpu_notes_buf();
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return rc;
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}
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/*
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* Validate and process the dump data stored by firmware before exporting
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* it through '/proc/vmcore'.
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*/
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static int __init rtas_fadump_process(struct fw_dump *fadump_conf)
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{
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struct fadump_crash_info_header *fdh;
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int rc = 0;
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if (!fdm_active || !fadump_conf->fadumphdr_addr)
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return -EINVAL;
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/* Check if the dump data is valid. */
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if ((be16_to_cpu(fdm_active->header.dump_status_flag) ==
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RTAS_FADUMP_ERROR_FLAG) ||
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(fdm_active->cpu_state_data.error_flags != 0) ||
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(fdm_active->rmr_region.error_flags != 0)) {
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pr_err("Dump taken by platform is not valid\n");
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return -EINVAL;
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}
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if ((fdm_active->rmr_region.bytes_dumped !=
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fdm_active->rmr_region.source_len) ||
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!fdm_active->cpu_state_data.bytes_dumped) {
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pr_err("Dump taken by platform is incomplete\n");
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return -EINVAL;
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}
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/* Validate the fadump crash info header */
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fdh = __va(fadump_conf->fadumphdr_addr);
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if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) {
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pr_err("Crash info header is not valid.\n");
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return -EINVAL;
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}
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rc = rtas_fadump_build_cpu_notes(fadump_conf);
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if (rc)
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return rc;
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/*
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* We are done validating dump info and elfcore header is now ready
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* to be exported. set elfcorehdr_addr so that vmcore module will
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* export the elfcore header through '/proc/vmcore'.
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*/
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elfcorehdr_addr = fdh->elfcorehdr_addr;
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return 0;
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}
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static void rtas_fadump_region_show(struct fw_dump *fadump_conf,
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struct seq_file *m)
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{
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const struct rtas_fadump_section *cpu_data_section;
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const struct rtas_fadump_mem_struct *fdm_ptr;
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if (fdm_active)
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fdm_ptr = fdm_active;
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else
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fdm_ptr = &fdm;
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cpu_data_section = &(fdm_ptr->cpu_state_data);
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seq_printf(m, "CPU :[%#016llx-%#016llx] %#llx bytes, Dumped: %#llx\n",
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be64_to_cpu(cpu_data_section->destination_address),
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be64_to_cpu(cpu_data_section->destination_address) +
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be64_to_cpu(cpu_data_section->source_len) - 1,
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be64_to_cpu(cpu_data_section->source_len),
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be64_to_cpu(cpu_data_section->bytes_dumped));
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seq_printf(m, "HPTE:[%#016llx-%#016llx] %#llx bytes, Dumped: %#llx\n",
|
|
be64_to_cpu(fdm_ptr->hpte_region.destination_address),
|
|
be64_to_cpu(fdm_ptr->hpte_region.destination_address) +
|
|
be64_to_cpu(fdm_ptr->hpte_region.source_len) - 1,
|
|
be64_to_cpu(fdm_ptr->hpte_region.source_len),
|
|
be64_to_cpu(fdm_ptr->hpte_region.bytes_dumped));
|
|
|
|
seq_printf(m, "DUMP: Src: %#016llx, Dest: %#016llx, ",
|
|
be64_to_cpu(fdm_ptr->rmr_region.source_address),
|
|
be64_to_cpu(fdm_ptr->rmr_region.destination_address));
|
|
seq_printf(m, "Size: %#llx, Dumped: %#llx bytes\n",
|
|
be64_to_cpu(fdm_ptr->rmr_region.source_len),
|
|
be64_to_cpu(fdm_ptr->rmr_region.bytes_dumped));
|
|
|
|
/* Dump is active. Show preserved area start address. */
|
|
if (fdm_active) {
|
|
seq_printf(m, "\nMemory above %#016llx is reserved for saving crash dump\n",
|
|
fadump_conf->boot_mem_top);
|
|
}
|
|
}
|
|
|
|
static void rtas_fadump_trigger(struct fadump_crash_info_header *fdh,
|
|
const char *msg)
|
|
{
|
|
/* Call ibm,os-term rtas call to trigger firmware assisted dump */
|
|
rtas_os_term((char *)msg);
|
|
}
|
|
|
|
static struct fadump_ops rtas_fadump_ops = {
|
|
.fadump_init_mem_struct = rtas_fadump_init_mem_struct,
|
|
.fadump_get_bootmem_min = rtas_fadump_get_bootmem_min,
|
|
.fadump_register = rtas_fadump_register,
|
|
.fadump_unregister = rtas_fadump_unregister,
|
|
.fadump_invalidate = rtas_fadump_invalidate,
|
|
.fadump_process = rtas_fadump_process,
|
|
.fadump_region_show = rtas_fadump_region_show,
|
|
.fadump_trigger = rtas_fadump_trigger,
|
|
};
|
|
|
|
void __init rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node)
|
|
{
|
|
int i, size, num_sections;
|
|
const __be32 *sections;
|
|
const __be32 *token;
|
|
|
|
/*
|
|
* Check if Firmware Assisted dump is supported. if yes, check
|
|
* if dump has been initiated on last reboot.
|
|
*/
|
|
token = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL);
|
|
if (!token)
|
|
return;
|
|
|
|
fadump_conf->ibm_configure_kernel_dump = be32_to_cpu(*token);
|
|
fadump_conf->ops = &rtas_fadump_ops;
|
|
fadump_conf->fadump_supported = 1;
|
|
|
|
/* Firmware supports 64-bit value for size, align it to pagesize. */
|
|
fadump_conf->max_copy_size = ALIGN_DOWN(U64_MAX, PAGE_SIZE);
|
|
|
|
/*
|
|
* The 'ibm,kernel-dump' rtas node is present only if there is
|
|
* dump data waiting for us.
|
|
*/
|
|
fdm_active = of_get_flat_dt_prop(node, "ibm,kernel-dump", NULL);
|
|
if (fdm_active) {
|
|
pr_info("Firmware-assisted dump is active.\n");
|
|
fadump_conf->dump_active = 1;
|
|
rtas_fadump_get_config(fadump_conf, (void *)__pa(fdm_active));
|
|
}
|
|
|
|
/* Get the sizes required to store dump data for the firmware provided
|
|
* dump sections.
|
|
* For each dump section type supported, a 32bit cell which defines
|
|
* the ID of a supported section followed by two 32 bit cells which
|
|
* gives the size of the section in bytes.
|
|
*/
|
|
sections = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes",
|
|
&size);
|
|
|
|
if (!sections)
|
|
return;
|
|
|
|
num_sections = size / (3 * sizeof(u32));
|
|
|
|
for (i = 0; i < num_sections; i++, sections += 3) {
|
|
u32 type = (u32)of_read_number(sections, 1);
|
|
|
|
switch (type) {
|
|
case RTAS_FADUMP_CPU_STATE_DATA:
|
|
fadump_conf->cpu_state_data_size =
|
|
of_read_ulong(§ions[1], 2);
|
|
break;
|
|
case RTAS_FADUMP_HPTE_REGION:
|
|
fadump_conf->hpte_region_size =
|
|
of_read_ulong(§ions[1], 2);
|
|
break;
|
|
}
|
|
}
|
|
}
|