mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-17 01:04:19 +08:00
pseries/fadump: move out platform specific support from generic code
Move code that supports processing the crash'ed kernel's memory preserved by firmware to platform specific callback functions. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821337690.5656.13050665924800177744.stgit@hbathini.in.ibm.com
This commit is contained in:
Hari Bathini
Michael Ellerman
parent
8255da95e5
commit
f35120115b
@ -28,15 +28,11 @@
|
||||
#include <asm/debugfs.h>
|
||||
#include <asm/page.h>
|
||||
#include <asm/prom.h>
|
||||
#include <asm/rtas.h>
|
||||
#include <asm/fadump.h>
|
||||
#include <asm/fadump-internal.h>
|
||||
#include <asm/setup.h>
|
||||
|
||||
#include "../platforms/pseries/rtas-fadump.h"
|
||||
|
||||
static struct fw_dump fw_dump;
|
||||
static const struct rtas_fadump_mem_struct *fdm_active;
|
||||
|
||||
static DEFINE_MUTEX(fadump_mutex);
|
||||
struct fad_crash_memory_ranges *crash_memory_ranges;
|
||||
@ -108,22 +104,13 @@ static int __init fadump_cma_init(void) { return 1; }
|
||||
#endif /* CONFIG_CMA */
|
||||
|
||||
/* Scan the Firmware Assisted dump configuration details. */
|
||||
int __init early_init_dt_scan_fw_dump(unsigned long node,
|
||||
const char *uname, int depth, void *data)
|
||||
int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname,
|
||||
int depth, void *data)
|
||||
{
|
||||
if (depth != 1 || strcmp(uname, "rtas") != 0)
|
||||
return 0;
|
||||
|
||||
rtas_fadump_dt_scan(&fw_dump, node);
|
||||
|
||||
/*
|
||||
* 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)
|
||||
fw_dump.dump_active = 1;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
@ -358,9 +345,7 @@ int __init fadump_reserve_mem(void)
|
||||
* If dump is active then we have already calculated the size during
|
||||
* first kernel.
|
||||
*/
|
||||
if (fdm_active)
|
||||
fw_dump.boot_memory_size = be64_to_cpu(fdm_active->rmr_region.source_len);
|
||||
else {
|
||||
if (!fw_dump.dump_active) {
|
||||
fw_dump.boot_memory_size = fadump_calculate_reserve_size();
|
||||
#ifdef CONFIG_CMA
|
||||
if (!fw_dump.nocma)
|
||||
@ -414,17 +399,9 @@ int __init fadump_reserve_mem(void)
|
||||
size = memory_boundary - base;
|
||||
fadump_reserve_crash_area(base, size);
|
||||
|
||||
fw_dump.fadumphdr_addr =
|
||||
be64_to_cpu(fdm_active->rmr_region.destination_address) +
|
||||
be64_to_cpu(fdm_active->rmr_region.source_len);
|
||||
pr_debug("fadumphdr_addr = %pa\n", &fw_dump.fadumphdr_addr);
|
||||
|
||||
/*
|
||||
* Start address of reserve dump area (permanent reservation)
|
||||
* for re-registering FADump after dump capture.
|
||||
*/
|
||||
fw_dump.reserve_dump_area_start =
|
||||
be64_to_cpu(fdm_active->cpu_state_data.destination_address);
|
||||
pr_debug("fadumphdr_addr = %#016lx\n", fw_dump.fadumphdr_addr);
|
||||
pr_debug("Reserve dump area start address: 0x%lx\n",
|
||||
fw_dump.reserve_dump_area_start);
|
||||
} else {
|
||||
/*
|
||||
* Reserve memory at an offset closer to bottom of the RAM to
|
||||
@ -539,66 +516,6 @@ void crash_fadump(struct pt_regs *regs, const char *str)
|
||||
fw_dump.ops->fadump_trigger(fdh, str);
|
||||
}
|
||||
|
||||
#define GPR_MASK 0xffffff0000000000
|
||||
static inline int fadump_gpr_index(u64 id)
|
||||
{
|
||||
int i = -1;
|
||||
char str[3];
|
||||
|
||||
if ((id & GPR_MASK) == fadump_str_to_u64("GPR")) {
|
||||
/* get the digits at the end */
|
||||
id &= ~GPR_MASK;
|
||||
id >>= 24;
|
||||
str[2] = '\0';
|
||||
str[1] = id & 0xff;
|
||||
str[0] = (id >> 8) & 0xff;
|
||||
sscanf(str, "%d", &i);
|
||||
if (i > 31)
|
||||
i = -1;
|
||||
}
|
||||
return i;
|
||||
}
|
||||
|
||||
static inline void fadump_set_regval(struct pt_regs *regs, u64 reg_id,
|
||||
u64 reg_val)
|
||||
{
|
||||
int i;
|
||||
|
||||
i = fadump_gpr_index(reg_id);
|
||||
if (i >= 0)
|
||||
regs->gpr[i] = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("NIA"))
|
||||
regs->nip = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("MSR"))
|
||||
regs->msr = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("CTR"))
|
||||
regs->ctr = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("LR"))
|
||||
regs->link = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("XER"))
|
||||
regs->xer = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("CR"))
|
||||
regs->ccr = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("DAR"))
|
||||
regs->dar = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("DSISR"))
|
||||
regs->dsisr = (unsigned long)reg_val;
|
||||
}
|
||||
|
||||
static struct rtas_fadump_reg_entry*
|
||||
fadump_read_registers(struct rtas_fadump_reg_entry *reg_entry, struct pt_regs *regs)
|
||||
{
|
||||
memset(regs, 0, sizeof(struct pt_regs));
|
||||
|
||||
while (be64_to_cpu(reg_entry->reg_id) != fadump_str_to_u64("CPUEND")) {
|
||||
fadump_set_regval(regs, be64_to_cpu(reg_entry->reg_id),
|
||||
be64_to_cpu(reg_entry->reg_value));
|
||||
reg_entry++;
|
||||
}
|
||||
reg_entry++;
|
||||
return reg_entry;
|
||||
}
|
||||
|
||||
u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs)
|
||||
{
|
||||
struct elf_prstatus prstatus;
|
||||
@ -686,147 +603,6 @@ void fadump_free_cpu_notes_buf(void)
|
||||
fw_dump.cpu_notes_buf_size = 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Read CPU state dump data and convert it into ELF notes.
|
||||
* The CPU dump starts with magic number "REGSAVE". NumCpusOffset should be
|
||||
* used to access the data to allow for additional fields to be added without
|
||||
* affecting compatibility. Each list of registers for a CPU starts with
|
||||
* "CPUSTRT" and ends with "CPUEND". Each register entry is of 16 bytes,
|
||||
* 8 Byte ASCII identifier and 8 Byte register value. The register entry
|
||||
* with identifier "CPUSTRT" and "CPUEND" contains 4 byte cpu id as part
|
||||
* of register value. For more details refer to PAPR document.
|
||||
*
|
||||
* Only for the crashing cpu we ignore the CPU dump data and get exact
|
||||
* state from fadump crash info structure populated by first kernel at the
|
||||
* time of crash.
|
||||
*/
|
||||
static int __init fadump_build_cpu_notes(const struct rtas_fadump_mem_struct *fdm)
|
||||
{
|
||||
struct rtas_fadump_reg_save_area_header *reg_header;
|
||||
struct rtas_fadump_reg_entry *reg_entry;
|
||||
struct fadump_crash_info_header *fdh = NULL;
|
||||
void *vaddr;
|
||||
unsigned long addr;
|
||||
u32 num_cpus, *note_buf;
|
||||
struct pt_regs regs;
|
||||
int i, rc = 0, cpu = 0;
|
||||
|
||||
if (!fdm->cpu_state_data.bytes_dumped)
|
||||
return -EINVAL;
|
||||
|
||||
addr = be64_to_cpu(fdm->cpu_state_data.destination_address);
|
||||
vaddr = __va(addr);
|
||||
|
||||
reg_header = vaddr;
|
||||
if (be64_to_cpu(reg_header->magic_number) !=
|
||||
fadump_str_to_u64("REGSAVE")) {
|
||||
printk(KERN_ERR "Unable to read register save area.\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
pr_debug("--------CPU State Data------------\n");
|
||||
pr_debug("Magic Number: %llx\n", be64_to_cpu(reg_header->magic_number));
|
||||
pr_debug("NumCpuOffset: %x\n", be32_to_cpu(reg_header->num_cpu_offset));
|
||||
|
||||
vaddr += be32_to_cpu(reg_header->num_cpu_offset);
|
||||
num_cpus = be32_to_cpu(*((__be32 *)(vaddr)));
|
||||
pr_debug("NumCpus : %u\n", num_cpus);
|
||||
vaddr += sizeof(u32);
|
||||
reg_entry = (struct rtas_fadump_reg_entry *)vaddr;
|
||||
|
||||
rc = fadump_setup_cpu_notes_buf(num_cpus);
|
||||
if (rc != 0)
|
||||
return rc;
|
||||
|
||||
note_buf = (u32 *)fw_dump.cpu_notes_buf_vaddr;
|
||||
|
||||
if (fw_dump.fadumphdr_addr)
|
||||
fdh = __va(fw_dump.fadumphdr_addr);
|
||||
|
||||
for (i = 0; i < num_cpus; i++) {
|
||||
if (be64_to_cpu(reg_entry->reg_id) != fadump_str_to_u64("CPUSTRT")) {
|
||||
printk(KERN_ERR "Unable to read CPU state data\n");
|
||||
rc = -ENOENT;
|
||||
goto error_out;
|
||||
}
|
||||
/* Lower 4 bytes of reg_value contains logical cpu id */
|
||||
cpu = be64_to_cpu(reg_entry->reg_value) & RTAS_FADUMP_CPU_ID_MASK;
|
||||
if (fdh && !cpumask_test_cpu(cpu, &fdh->online_mask)) {
|
||||
RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry);
|
||||
continue;
|
||||
}
|
||||
pr_debug("Reading register data for cpu %d...\n", cpu);
|
||||
if (fdh && fdh->crashing_cpu == cpu) {
|
||||
regs = fdh->regs;
|
||||
note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
|
||||
RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry);
|
||||
} else {
|
||||
reg_entry++;
|
||||
reg_entry = fadump_read_registers(reg_entry, ®s);
|
||||
note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
|
||||
}
|
||||
}
|
||||
final_note(note_buf);
|
||||
|
||||
if (fdh) {
|
||||
pr_debug("Updating elfcore header (%llx) with cpu notes\n",
|
||||
fdh->elfcorehdr_addr);
|
||||
fadump_update_elfcore_header((char *)__va(fdh->elfcorehdr_addr));
|
||||
}
|
||||
return 0;
|
||||
|
||||
error_out:
|
||||
fadump_free_cpu_notes_buf();
|
||||
return rc;
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* Validate and process the dump data stored by firmware before exporting
|
||||
* it through '/proc/vmcore'.
|
||||
*/
|
||||
static int __init process_fadump(const struct rtas_fadump_mem_struct *fdm_active)
|
||||
{
|
||||
struct fadump_crash_info_header *fdh;
|
||||
int rc = 0;
|
||||
|
||||
if (!fdm_active || !fw_dump.fadumphdr_addr)
|
||||
return -EINVAL;
|
||||
|
||||
/* Check if the dump data is valid. */
|
||||
if ((be16_to_cpu(fdm_active->header.dump_status_flag) == RTAS_FADUMP_ERROR_FLAG) ||
|
||||
(fdm_active->cpu_state_data.error_flags != 0) ||
|
||||
(fdm_active->rmr_region.error_flags != 0)) {
|
||||
printk(KERN_ERR "Dump taken by platform is not valid\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
if ((fdm_active->rmr_region.bytes_dumped !=
|
||||
fdm_active->rmr_region.source_len) ||
|
||||
!fdm_active->cpu_state_data.bytes_dumped) {
|
||||
printk(KERN_ERR "Dump taken by platform is incomplete\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Validate the fadump crash info header */
|
||||
fdh = __va(fw_dump.fadumphdr_addr);
|
||||
if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) {
|
||||
printk(KERN_ERR "Crash info header is not valid.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
rc = fadump_build_cpu_notes(fdm_active);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
/*
|
||||
* We are done validating dump info and elfcore header is now ready
|
||||
* to be exported. set elfcorehdr_addr so that vmcore module will
|
||||
* export the elfcore header through '/proc/vmcore'.
|
||||
*/
|
||||
elfcorehdr_addr = fdh->elfcorehdr_addr;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void free_crash_memory_ranges(void)
|
||||
{
|
||||
kfree(crash_memory_ranges);
|
||||
@ -1116,7 +892,6 @@ static unsigned long init_fadump_header(unsigned long addr)
|
||||
if (!addr)
|
||||
return 0;
|
||||
|
||||
fw_dump.fadumphdr_addr = addr;
|
||||
fdh = __va(addr);
|
||||
addr += sizeof(struct fadump_crash_info_header);
|
||||
|
||||
@ -1160,39 +935,12 @@ static int register_fadump(void)
|
||||
return fw_dump.ops->fadump_register(&fw_dump);
|
||||
}
|
||||
|
||||
static int fadump_invalidate_dump(const struct rtas_fadump_mem_struct *fdm)
|
||||
{
|
||||
int rc = 0;
|
||||
unsigned int wait_time;
|
||||
|
||||
pr_debug("Invalidating firmware-assisted dump registration\n");
|
||||
|
||||
/* TODO: Add upper time limit for the delay */
|
||||
do {
|
||||
rc = rtas_call(fw_dump.ibm_configure_kernel_dump, 3, 1, NULL,
|
||||
FADUMP_INVALIDATE, fdm,
|
||||
sizeof(struct rtas_fadump_mem_struct));
|
||||
|
||||
wait_time = rtas_busy_delay_time(rc);
|
||||
if (wait_time)
|
||||
mdelay(wait_time);
|
||||
} while (wait_time);
|
||||
|
||||
if (rc) {
|
||||
pr_err("Failed to invalidate firmware-assisted dump registration. Unexpected error (%d).\n", rc);
|
||||
return rc;
|
||||
}
|
||||
fw_dump.dump_active = 0;
|
||||
fdm_active = NULL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
void fadump_cleanup(void)
|
||||
{
|
||||
/* Invalidate the registration only if dump is active. */
|
||||
if (fw_dump.dump_active) {
|
||||
/* pass the same memory dump structure provided by platform */
|
||||
fadump_invalidate_dump(fdm_active);
|
||||
pr_debug("Invalidating firmware-assisted dump registration\n");
|
||||
fw_dump.ops->fadump_invalidate(&fw_dump);
|
||||
} else if (fw_dump.dump_registered) {
|
||||
/* Un-register Firmware-assisted dump if it was registered. */
|
||||
fw_dump.ops->fadump_unregister(&fw_dump);
|
||||
@ -1333,7 +1081,7 @@ static ssize_t fadump_register_store(struct kobject *kobj,
|
||||
int ret = 0;
|
||||
int input = -1;
|
||||
|
||||
if (!fw_dump.fadump_enabled || fdm_active)
|
||||
if (!fw_dump.fadump_enabled || fw_dump.dump_active)
|
||||
return -EPERM;
|
||||
|
||||
if (kstrtoint(buf, 0, &input))
|
||||
@ -1346,6 +1094,7 @@ static ssize_t fadump_register_store(struct kobject *kobj,
|
||||
if (fw_dump.dump_registered == 0) {
|
||||
goto unlock_out;
|
||||
}
|
||||
|
||||
/* Un-register Firmware-assisted dump */
|
||||
pr_debug("Un-register firmware-assisted dump\n");
|
||||
fw_dump.ops->fadump_unregister(&fw_dump);
|
||||
@ -1370,63 +1119,12 @@ unlock_out:
|
||||
|
||||
static int fadump_region_show(struct seq_file *m, void *private)
|
||||
{
|
||||
const struct rtas_fadump_mem_struct *fdm_ptr;
|
||||
|
||||
if (!fw_dump.fadump_enabled)
|
||||
return 0;
|
||||
|
||||
mutex_lock(&fadump_mutex);
|
||||
if (fdm_active)
|
||||
fdm_ptr = fdm_active;
|
||||
else {
|
||||
mutex_unlock(&fadump_mutex);
|
||||
fw_dump.ops->fadump_region_show(&fw_dump, m);
|
||||
return 0;
|
||||
}
|
||||
|
||||
seq_printf(m,
|
||||
"CPU : [%#016llx-%#016llx] %#llx bytes, "
|
||||
"Dumped: %#llx\n",
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.destination_address),
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) +
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.source_len) - 1,
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.source_len),
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.bytes_dumped));
|
||||
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: [%#016llx-%#016llx] %#llx bytes, "
|
||||
"Dumped: %#llx\n",
|
||||
be64_to_cpu(fdm_ptr->rmr_region.destination_address),
|
||||
be64_to_cpu(fdm_ptr->rmr_region.destination_address) +
|
||||
be64_to_cpu(fdm_ptr->rmr_region.source_len) - 1,
|
||||
be64_to_cpu(fdm_ptr->rmr_region.source_len),
|
||||
be64_to_cpu(fdm_ptr->rmr_region.bytes_dumped));
|
||||
|
||||
if (!fdm_active ||
|
||||
(fw_dump.reserve_dump_area_start ==
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.destination_address)))
|
||||
goto out;
|
||||
|
||||
/* Dump is active. Show reserved memory region. */
|
||||
seq_printf(m,
|
||||
" : [%#016llx-%#016llx] %#llx bytes, "
|
||||
"Dumped: %#llx\n",
|
||||
(unsigned long long)fw_dump.reserve_dump_area_start,
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) - 1,
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) -
|
||||
fw_dump.reserve_dump_area_start,
|
||||
be64_to_cpu(fdm_ptr->cpu_state_data.destination_address) -
|
||||
fw_dump.reserve_dump_area_start);
|
||||
out:
|
||||
if (fdm_active)
|
||||
mutex_unlock(&fadump_mutex);
|
||||
fw_dump.ops->fadump_region_show(&fw_dump, m);
|
||||
mutex_unlock(&fadump_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
@ -1497,12 +1195,13 @@ int __init setup_fadump(void)
|
||||
* if dump process fails then invalidate the registration
|
||||
* and release memory before proceeding for re-registration.
|
||||
*/
|
||||
if (process_fadump(fdm_active) < 0)
|
||||
if (fw_dump.ops->fadump_process(&fw_dump) < 0)
|
||||
fadump_invalidate_release_mem();
|
||||
}
|
||||
/* Initialize the kernel dump memory structure for FAD registration. */
|
||||
else if (fw_dump.reserve_dump_area_size)
|
||||
fw_dump.ops->fadump_init_mem_struct(&fw_dump);
|
||||
|
||||
fadump_init_files();
|
||||
|
||||
return 1;
|
||||
|
||||
@ -23,6 +23,7 @@
|
||||
#include "rtas-fadump.h"
|
||||
|
||||
static struct rtas_fadump_mem_struct fdm;
|
||||
static const struct rtas_fadump_mem_struct *fdm_active;
|
||||
|
||||
static void rtas_fadump_update_config(struct fw_dump *fadump_conf,
|
||||
const struct rtas_fadump_mem_struct *fdm)
|
||||
@ -34,6 +35,25 @@ static void rtas_fadump_update_config(struct fw_dump *fadump_conf,
|
||||
fadump_conf->boot_memory_size);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function is called in the capture kernel to get configuration details
|
||||
* setup in the first kernel and passed to the f/w.
|
||||
*/
|
||||
static void rtas_fadump_get_config(struct fw_dump *fadump_conf,
|
||||
const struct rtas_fadump_mem_struct *fdm)
|
||||
{
|
||||
fadump_conf->boot_memory_size = be64_to_cpu(fdm->rmr_region.source_len);
|
||||
|
||||
/*
|
||||
* Start address of reserve dump area (permanent reservation) for
|
||||
* re-registering FADump after dump capture.
|
||||
*/
|
||||
fadump_conf->reserve_dump_area_start =
|
||||
be64_to_cpu(fdm->cpu_state_data.destination_address);
|
||||
|
||||
rtas_fadump_update_config(fadump_conf, fdm);
|
||||
}
|
||||
|
||||
static u64 rtas_fadump_init_mem_struct(struct fw_dump *fadump_conf)
|
||||
{
|
||||
u64 addr = fadump_conf->reserve_dump_area_start;
|
||||
@ -171,7 +191,183 @@ static int rtas_fadump_unregister(struct fw_dump *fadump_conf)
|
||||
|
||||
static int rtas_fadump_invalidate(struct fw_dump *fadump_conf)
|
||||
{
|
||||
return -EIO;
|
||||
unsigned int wait_time;
|
||||
int rc;
|
||||
|
||||
/* TODO: Add upper time limit for the delay */
|
||||
do {
|
||||
rc = rtas_call(fadump_conf->ibm_configure_kernel_dump, 3, 1,
|
||||
NULL, FADUMP_INVALIDATE, fdm_active,
|
||||
sizeof(struct rtas_fadump_mem_struct));
|
||||
|
||||
wait_time = rtas_busy_delay_time(rc);
|
||||
if (wait_time)
|
||||
mdelay(wait_time);
|
||||
} while (wait_time);
|
||||
|
||||
if (rc) {
|
||||
pr_err("Failed to invalidate - unexpected error (%d).\n", rc);
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
fadump_conf->dump_active = 0;
|
||||
fdm_active = NULL;
|
||||
return 0;
|
||||
}
|
||||
|
||||
#define RTAS_FADUMP_GPR_MASK 0xffffff0000000000
|
||||
static inline int rtas_fadump_gpr_index(u64 id)
|
||||
{
|
||||
char str[3];
|
||||
int i = -1;
|
||||
|
||||
if ((id & RTAS_FADUMP_GPR_MASK) == fadump_str_to_u64("GPR")) {
|
||||
/* get the digits at the end */
|
||||
id &= ~RTAS_FADUMP_GPR_MASK;
|
||||
id >>= 24;
|
||||
str[2] = '\0';
|
||||
str[1] = id & 0xff;
|
||||
str[0] = (id >> 8) & 0xff;
|
||||
if (kstrtoint(str, 10, &i))
|
||||
i = -EINVAL;
|
||||
if (i > 31)
|
||||
i = -1;
|
||||
}
|
||||
return i;
|
||||
}
|
||||
|
||||
void rtas_fadump_set_regval(struct pt_regs *regs, u64 reg_id, u64 reg_val)
|
||||
{
|
||||
int i;
|
||||
|
||||
i = rtas_fadump_gpr_index(reg_id);
|
||||
if (i >= 0)
|
||||
regs->gpr[i] = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("NIA"))
|
||||
regs->nip = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("MSR"))
|
||||
regs->msr = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("CTR"))
|
||||
regs->ctr = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("LR"))
|
||||
regs->link = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("XER"))
|
||||
regs->xer = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("CR"))
|
||||
regs->ccr = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("DAR"))
|
||||
regs->dar = (unsigned long)reg_val;
|
||||
else if (reg_id == fadump_str_to_u64("DSISR"))
|
||||
regs->dsisr = (unsigned long)reg_val;
|
||||
}
|
||||
|
||||
static struct rtas_fadump_reg_entry*
|
||||
rtas_fadump_read_regs(struct rtas_fadump_reg_entry *reg_entry,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
memset(regs, 0, sizeof(struct pt_regs));
|
||||
|
||||
while (be64_to_cpu(reg_entry->reg_id) != fadump_str_to_u64("CPUEND")) {
|
||||
rtas_fadump_set_regval(regs, be64_to_cpu(reg_entry->reg_id),
|
||||
be64_to_cpu(reg_entry->reg_value));
|
||||
reg_entry++;
|
||||
}
|
||||
reg_entry++;
|
||||
return reg_entry;
|
||||
}
|
||||
|
||||
/*
|
||||
* Read CPU state dump data and convert it into ELF notes.
|
||||
* The CPU dump starts with magic number "REGSAVE". NumCpusOffset should be
|
||||
* used to access the data to allow for additional fields to be added without
|
||||
* affecting compatibility. Each list of registers for a CPU starts with
|
||||
* "CPUSTRT" and ends with "CPUEND". Each register entry is of 16 bytes,
|
||||
* 8 Byte ASCII identifier and 8 Byte register value. The register entry
|
||||
* with identifier "CPUSTRT" and "CPUEND" contains 4 byte cpu id as part
|
||||
* of register value. For more details refer to PAPR document.
|
||||
*
|
||||
* Only for the crashing cpu we ignore the CPU dump data and get exact
|
||||
* state from fadump crash info structure populated by first kernel at the
|
||||
* time of crash.
|
||||
*/
|
||||
static int __init rtas_fadump_build_cpu_notes(struct fw_dump *fadump_conf)
|
||||
{
|
||||
struct rtas_fadump_reg_save_area_header *reg_header;
|
||||
struct fadump_crash_info_header *fdh = NULL;
|
||||
struct rtas_fadump_reg_entry *reg_entry;
|
||||
u32 num_cpus, *note_buf;
|
||||
int i, rc = 0, cpu = 0;
|
||||
struct pt_regs regs;
|
||||
unsigned long addr;
|
||||
void *vaddr;
|
||||
|
||||
addr = be64_to_cpu(fdm_active->cpu_state_data.destination_address);
|
||||
vaddr = __va(addr);
|
||||
|
||||
reg_header = vaddr;
|
||||
if (be64_to_cpu(reg_header->magic_number) !=
|
||||
fadump_str_to_u64("REGSAVE")) {
|
||||
pr_err("Unable to read register save area.\n");
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
pr_debug("--------CPU State Data------------\n");
|
||||
pr_debug("Magic Number: %llx\n", be64_to_cpu(reg_header->magic_number));
|
||||
pr_debug("NumCpuOffset: %x\n", be32_to_cpu(reg_header->num_cpu_offset));
|
||||
|
||||
vaddr += be32_to_cpu(reg_header->num_cpu_offset);
|
||||
num_cpus = be32_to_cpu(*((__be32 *)(vaddr)));
|
||||
pr_debug("NumCpus : %u\n", num_cpus);
|
||||
vaddr += sizeof(u32);
|
||||
reg_entry = (struct rtas_fadump_reg_entry *)vaddr;
|
||||
|
||||
rc = fadump_setup_cpu_notes_buf(num_cpus);
|
||||
if (rc != 0)
|
||||
return rc;
|
||||
|
||||
note_buf = (u32 *)fadump_conf->cpu_notes_buf_vaddr;
|
||||
|
||||
if (fadump_conf->fadumphdr_addr)
|
||||
fdh = __va(fadump_conf->fadumphdr_addr);
|
||||
|
||||
for (i = 0; i < num_cpus; i++) {
|
||||
if (be64_to_cpu(reg_entry->reg_id) !=
|
||||
fadump_str_to_u64("CPUSTRT")) {
|
||||
pr_err("Unable to read CPU state data\n");
|
||||
rc = -ENOENT;
|
||||
goto error_out;
|
||||
}
|
||||
/* Lower 4 bytes of reg_value contains logical cpu id */
|
||||
cpu = (be64_to_cpu(reg_entry->reg_value) &
|
||||
RTAS_FADUMP_CPU_ID_MASK);
|
||||
if (fdh && !cpumask_test_cpu(cpu, &fdh->online_mask)) {
|
||||
RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry);
|
||||
continue;
|
||||
}
|
||||
pr_debug("Reading register data for cpu %d...\n", cpu);
|
||||
if (fdh && fdh->crashing_cpu == cpu) {
|
||||
regs = fdh->regs;
|
||||
note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
|
||||
RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry);
|
||||
} else {
|
||||
reg_entry++;
|
||||
reg_entry = rtas_fadump_read_regs(reg_entry, ®s);
|
||||
note_buf = fadump_regs_to_elf_notes(note_buf, ®s);
|
||||
}
|
||||
}
|
||||
final_note(note_buf);
|
||||
|
||||
if (fdh) {
|
||||
pr_debug("Updating elfcore header (%llx) with cpu notes\n",
|
||||
fdh->elfcorehdr_addr);
|
||||
fadump_update_elfcore_header(__va(fdh->elfcorehdr_addr));
|
||||
}
|
||||
return 0;
|
||||
|
||||
error_out:
|
||||
fadump_free_cpu_notes_buf();
|
||||
return rc;
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
@ -180,14 +376,58 @@ static int rtas_fadump_invalidate(struct fw_dump *fadump_conf)
|
||||
*/
|
||||
static int __init rtas_fadump_process(struct fw_dump *fadump_conf)
|
||||
{
|
||||
return -EINVAL;
|
||||
struct fadump_crash_info_header *fdh;
|
||||
int rc = 0;
|
||||
|
||||
if (!fdm_active || !fadump_conf->fadumphdr_addr)
|
||||
return -EINVAL;
|
||||
|
||||
/* Check if the dump data is valid. */
|
||||
if ((be16_to_cpu(fdm_active->header.dump_status_flag) ==
|
||||
RTAS_FADUMP_ERROR_FLAG) ||
|
||||
(fdm_active->cpu_state_data.error_flags != 0) ||
|
||||
(fdm_active->rmr_region.error_flags != 0)) {
|
||||
pr_err("Dump taken by platform is not valid\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
if ((fdm_active->rmr_region.bytes_dumped !=
|
||||
fdm_active->rmr_region.source_len) ||
|
||||
!fdm_active->cpu_state_data.bytes_dumped) {
|
||||
pr_err("Dump taken by platform is incomplete\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Validate the fadump crash info header */
|
||||
fdh = __va(fadump_conf->fadumphdr_addr);
|
||||
if (fdh->magic_number != FADUMP_CRASH_INFO_MAGIC) {
|
||||
pr_err("Crash info header is not valid.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
rc = rtas_fadump_build_cpu_notes(fadump_conf);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
/*
|
||||
* We are done validating dump info and elfcore header is now ready
|
||||
* to be exported. set elfcorehdr_addr so that vmcore module will
|
||||
* export the elfcore header through '/proc/vmcore'.
|
||||
*/
|
||||
elfcorehdr_addr = fdh->elfcorehdr_addr;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void rtas_fadump_region_show(struct fw_dump *fadump_conf,
|
||||
struct seq_file *m)
|
||||
{
|
||||
const struct rtas_fadump_mem_struct *fdm_ptr = &fdm;
|
||||
const struct rtas_fadump_section *cpu_data_section;
|
||||
const struct rtas_fadump_mem_struct *fdm_ptr;
|
||||
|
||||
if (fdm_active)
|
||||
fdm_ptr = fdm_active;
|
||||
else
|
||||
fdm_ptr = &fdm;
|
||||
|
||||
cpu_data_section = &(fdm_ptr->cpu_state_data);
|
||||
seq_printf(m, "CPU :[%#016llx-%#016llx] %#llx bytes, Dumped: %#llx\n",
|
||||
@ -210,6 +450,12 @@ static void rtas_fadump_region_show(struct fw_dump *fadump_conf,
|
||||
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 reserved area start address. */
|
||||
if (fdm_active) {
|
||||
seq_printf(m, "\nMemory above %#016lx is reserved for saving crash dump\n",
|
||||
fadump_conf->reserve_dump_area_start);
|
||||
}
|
||||
}
|
||||
|
||||
static void rtas_fadump_trigger(struct fadump_crash_info_header *fdh,
|
||||
@ -247,6 +493,17 @@ void __init rtas_fadump_dt_scan(struct fw_dump *fadump_conf, u64 node)
|
||||
fadump_conf->ops = &rtas_fadump_ops;
|
||||
fadump_conf->fadump_supported = 1;
|
||||
|
||||
/*
|
||||
* 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
|
||||
|
||||
Loading…
Reference in New Issue
Block a user