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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 2019-09-11 20:19:44 +05:30 committed by Michael Ellerman
parent 8255da95e5
commit f35120115b
2 changed files with 274 additions and 318 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

329
arch/powerpc/kernel/fadump.c
View File

@ -28,15 +28,11 @@
#include <asm/debugfs.h> #include <asm/debugfs.h>
#include <asm/page.h> #include <asm/page.h>
#include <asm/prom.h> #include <asm/prom.h>
#include <asm/rtas.h>
#include <asm/fadump.h> #include <asm/fadump.h>
#include <asm/fadump-internal.h> #include <asm/fadump-internal.h>
#include <asm/setup.h> #include <asm/setup.h>
#include "../platforms/pseries/rtas-fadump.h"
static struct fw_dump fw_dump; static struct fw_dump fw_dump;
static const struct rtas_fadump_mem_struct *fdm_active;
static DEFINE_MUTEX(fadump_mutex); static DEFINE_MUTEX(fadump_mutex);
struct fad_crash_memory_ranges *crash_memory_ranges; struct fad_crash_memory_ranges *crash_memory_ranges;
@ -108,22 +104,13 @@ static int __init fadump_cma_init(void) { return 1; }
#endif /* CONFIG_CMA */ #endif /* CONFIG_CMA */
/* Scan the Firmware Assisted dump configuration details. */ /* Scan the Firmware Assisted dump configuration details. */
int __init early_init_dt_scan_fw_dump(unsigned long node, int __init early_init_dt_scan_fw_dump(unsigned long node, const char *uname,
const char *uname, int depth, void *data) int depth, void *data)
{ {
if (depth != 1 || strcmp(uname, "rtas") != 0) if (depth != 1 || strcmp(uname, "rtas") != 0)
return 0; return 0;
rtas_fadump_dt_scan(&fw_dump, node); 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; return 1;
} }
@ -358,9 +345,7 @@ int __init fadump_reserve_mem(void)
* If dump is active then we have already calculated the size during * If dump is active then we have already calculated the size during
* first kernel. * first kernel.
*/ */
if (fdm_active) if (!fw_dump.dump_active) {
fw_dump.boot_memory_size = be64_to_cpu(fdm_active->rmr_region.source_len);
else {
fw_dump.boot_memory_size = fadump_calculate_reserve_size(); fw_dump.boot_memory_size = fadump_calculate_reserve_size();
#ifdef CONFIG_CMA #ifdef CONFIG_CMA
if (!fw_dump.nocma) if (!fw_dump.nocma)
@ -414,17 +399,9 @@ int __init fadump_reserve_mem(void)
size = memory_boundary - base; size = memory_boundary - base;
fadump_reserve_crash_area(base, size); fadump_reserve_crash_area(base, size);
fw_dump.fadumphdr_addr = pr_debug("fadumphdr_addr = %#016lx\n", fw_dump.fadumphdr_addr);
be64_to_cpu(fdm_active->rmr_region.destination_address) + pr_debug("Reserve dump area start address: 0x%lx\n",
be64_to_cpu(fdm_active->rmr_region.source_len); fw_dump.reserve_dump_area_start);
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);
} else { } else {
/* /*
* Reserve memory at an offset closer to bottom of the RAM to * 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); 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) u32 *fadump_regs_to_elf_notes(u32 *buf, struct pt_regs *regs)
{ {
struct elf_prstatus prstatus; struct elf_prstatus prstatus;
@ -686,147 +603,6 @@ void fadump_free_cpu_notes_buf(void)
fw_dump.cpu_notes_buf_size = 0; 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, &regs);
RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry);
} else {
reg_entry++;
reg_entry = fadump_read_registers(reg_entry, &regs);
note_buf = fadump_regs_to_elf_notes(note_buf, &regs);
}
}
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) static void free_crash_memory_ranges(void)
{ {
kfree(crash_memory_ranges); kfree(crash_memory_ranges);
@ -1116,7 +892,6 @@ static unsigned long init_fadump_header(unsigned long addr)
if (!addr) if (!addr)
return 0; return 0;
fw_dump.fadumphdr_addr = addr;
fdh = __va(addr); fdh = __va(addr);
addr += sizeof(struct fadump_crash_info_header); addr += sizeof(struct fadump_crash_info_header);
@ -1160,39 +935,12 @@ static int register_fadump(void)
return fw_dump.ops->fadump_register(&fw_dump); 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) void fadump_cleanup(void)
{ {
/* Invalidate the registration only if dump is active. */ /* Invalidate the registration only if dump is active. */
if (fw_dump.dump_active) { if (fw_dump.dump_active) {
/* pass the same memory dump structure provided by platform */ pr_debug("Invalidating firmware-assisted dump registration\n");
fadump_invalidate_dump(fdm_active); fw_dump.ops->fadump_invalidate(&fw_dump);
} else if (fw_dump.dump_registered) { } else if (fw_dump.dump_registered) {
/* Un-register Firmware-assisted dump if it was registered. */ /* Un-register Firmware-assisted dump if it was registered. */
fw_dump.ops->fadump_unregister(&fw_dump); fw_dump.ops->fadump_unregister(&fw_dump);
@ -1333,7 +1081,7 @@ static ssize_t fadump_register_store(struct kobject *kobj,
int ret = 0; int ret = 0;
int input = -1; int input = -1;
if (!fw_dump.fadump_enabled || fdm_active) if (!fw_dump.fadump_enabled || fw_dump.dump_active)
return -EPERM; return -EPERM;
if (kstrtoint(buf, 0, &input)) if (kstrtoint(buf, 0, &input))
@ -1346,6 +1094,7 @@ static ssize_t fadump_register_store(struct kobject *kobj,
if (fw_dump.dump_registered == 0) { if (fw_dump.dump_registered == 0) {
goto unlock_out; goto unlock_out;
} }
/* Un-register Firmware-assisted dump */ /* Un-register Firmware-assisted dump */
pr_debug("Un-register firmware-assisted dump\n"); pr_debug("Un-register firmware-assisted dump\n");
fw_dump.ops->fadump_unregister(&fw_dump); fw_dump.ops->fadump_unregister(&fw_dump);
@ -1370,63 +1119,12 @@ static ssize_t fadump_register_store(struct kobject *kobj,
static int fadump_region_show(struct seq_file *m, void *private) static int fadump_region_show(struct seq_file *m, void *private)
{ {
const struct rtas_fadump_mem_struct *fdm_ptr;
if (!fw_dump.fadump_enabled) if (!fw_dump.fadump_enabled)
return 0; return 0;
mutex_lock(&fadump_mutex); mutex_lock(&fadump_mutex);
if (fdm_active) fw_dump.ops->fadump_region_show(&fw_dump, m);
fdm_ptr = fdm_active; mutex_unlock(&fadump_mutex);
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);
return 0; return 0;
} }
@ -1497,12 +1195,13 @@ int __init setup_fadump(void)
* if dump process fails then invalidate the registration * if dump process fails then invalidate the registration
* and release memory before proceeding for re-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(); fadump_invalidate_release_mem();
} }
/* Initialize the kernel dump memory structure for FAD registration. */ /* Initialize the kernel dump memory structure for FAD registration. */
else if (fw_dump.reserve_dump_area_size) else if (fw_dump.reserve_dump_area_size)
fw_dump.ops->fadump_init_mem_struct(&fw_dump); fw_dump.ops->fadump_init_mem_struct(&fw_dump);
fadump_init_files(); fadump_init_files();
return 1; return 1;

263
arch/powerpc/platforms/pseries/rtas-fadump.c
View File

@ -23,6 +23,7 @@
#include "rtas-fadump.h" #include "rtas-fadump.h"
static struct rtas_fadump_mem_struct fdm; 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, static void rtas_fadump_update_config(struct fw_dump *fadump_conf,
const struct rtas_fadump_mem_struct *fdm) 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); 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) static u64 rtas_fadump_init_mem_struct(struct fw_dump *fadump_conf)
{ {
u64 addr = fadump_conf->reserve_dump_area_start; 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) 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, &regs);
RTAS_FADUMP_SKIP_TO_NEXT_CPU(reg_entry);
} else {
reg_entry++;
reg_entry = rtas_fadump_read_regs(reg_entry, &regs);
note_buf = fadump_regs_to_elf_notes(note_buf, &regs);
}
}
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) 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, static void rtas_fadump_region_show(struct fw_dump *fadump_conf,
struct seq_file *m) 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_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); cpu_data_section = &(fdm_ptr->cpu_state_data);
seq_printf(m, "CPU :[%#016llx-%#016llx] %#llx bytes, Dumped: %#llx\n", 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", 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.source_len),
be64_to_cpu(fdm_ptr->rmr_region.bytes_dumped)); 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, 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->ops = &rtas_fadump_ops;
fadump_conf->fadump_supported = 1; 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 /* Get the sizes required to store dump data for the firmware provided
* dump sections. * dump sections.
* For each dump section type supported, a 32bit cell which defines * For each dump section type supported, a 32bit cell which defines