u-boot/cmd/pstore.c
Frédéric Danis 9ea0a1ee93 cmd: Fixup DT to pass PStore Ramoops parameters
To simplify configuration and keep synchronized the PStore/Ramoops between
U-Boot and the Linux kernel, this commit dynamically adds the Ramoops
parameters defined in the U-Boot session to the Device Tree.

Signed-off-by: Frédéric Danis <frederic.danis@collabora.com>
Cc: Tom Rini <trini@konsulko.com>
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Heiko Schocher <hs@denx.de>
2020-10-14 11:16:34 -04:00

544 lines
16 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright © 2019 Collabora Ltd
*/
#include <config.h>
#include <command.h>
#include <fs.h>
#include <log.h>
#include <mapmem.h>
#include <memalign.h>
#include <part.h>
struct persistent_ram_buffer {
u32 sig;
u32 start;
u32 size;
u8 data[0];
};
#define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */
#define RAMOOPS_KERNMSG_HDR "===="
#define PSTORE_TYPE_DMESG 0
#define PSTORE_TYPE_CONSOLE 2
#define PSTORE_TYPE_FTRACE 3
#define PSTORE_TYPE_PMSG 7
#define PSTORE_TYPE_ALL 255
static phys_addr_t pstore_addr = CONFIG_CMD_PSTORE_MEM_ADDR;
static phys_size_t pstore_length = CONFIG_CMD_PSTORE_MEM_SIZE;
static unsigned int pstore_record_size = CONFIG_CMD_PSTORE_RECORD_SIZE;
static unsigned int pstore_console_size = CONFIG_CMD_PSTORE_CONSOLE_SIZE;
static unsigned int pstore_ftrace_size = CONFIG_CMD_PSTORE_FTRACE_SIZE;
static unsigned int pstore_pmsg_size = CONFIG_CMD_PSTORE_PMSG_SIZE;
static unsigned int pstore_ecc_size = CONFIG_CMD_PSTORE_ECC_SIZE;
static unsigned int buffer_size;
/**
* pstore_read_kmsg_hdr() - Check kernel header and get compression flag if
* available.
* @buffer: Kernel messages buffer.
* @compressed: Returns TRUE if kernel buffer is compressed, else FALSE.
*
* Check if buffer starts with a kernel header of the form:
* ====<secs>.<nsecs>[-<compression>]\n
* If <compression> is equal to 'C' then the buffer is compressed, else iter
* should be 'D'.
*
* Return: Length of kernel header.
*/
static int pstore_read_kmsg_hdr(char *buffer, bool *compressed)
{
char *ptr = buffer;
*compressed = false;
if (strncmp(RAMOOPS_KERNMSG_HDR, ptr, strlen(RAMOOPS_KERNMSG_HDR)) != 0)
return 0;
ptr += strlen(RAMOOPS_KERNMSG_HDR);
ptr = strchr(ptr, '\n');
if (!ptr)
return 0;
if (ptr[-2] == '-' && ptr[-1] == 'C')
*compressed = true;
return ptr - buffer + 1;
}
/**
* pstore_get_buffer() - Get unwrapped record buffer
* @sig: Signature to check
* @buffer: Buffer containing wrapped record
* @size: wrapped record size
* @dest: Buffer used to store unwrapped record
*
* The record starts with <signature><start><size> header.
* The signature is 'DBGC' for all records except for Ftrace's record(s) wich
* use LINUX_VERSION_CODE ^ 'DBGC'.
* Use 0 for @sig to prevent checking signature.
* Start and size are 4 bytes long.
*
* Return: record's length
*/
static u32 pstore_get_buffer(u32 sig, phys_addr_t buffer, u32 size, char *dest)
{
struct persistent_ram_buffer *prb =
(struct persistent_ram_buffer *)map_sysmem(buffer, size);
u32 dest_size;
if (sig == 0 || prb->sig == sig) {
if (prb->size == 0) {
log_debug("found existing empty buffer\n");
return 0;
}
if (prb->size > size) {
log_debug("found existing invalid buffer, size %u, start %u\n",
prb->size, prb->start);
return 0;
}
} else {
log_debug("no valid data in buffer (sig = 0x%08x)\n", prb->sig);
return 0;
}
log_debug("found existing buffer, size %u, start %u\n",
prb->size, prb->start);
memcpy(dest, &prb->data[prb->start], prb->size - prb->start);
memcpy(dest + prb->size - prb->start, &prb->data[0], prb->start);
dest_size = prb->size;
unmap_sysmem(prb);
return dest_size;
}
/**
* pstore_init_buffer_size() - Init buffer size to largest record size
*
* Records, console, FTrace and user logs can use different buffer sizes.
* This function allows to retrieve the biggest one.
*/
static void pstore_init_buffer_size(void)
{
if (pstore_record_size > buffer_size)
buffer_size = pstore_record_size;
if (pstore_console_size > buffer_size)
buffer_size = pstore_console_size;
if (pstore_ftrace_size > buffer_size)
buffer_size = pstore_ftrace_size;
if (pstore_pmsg_size > buffer_size)
buffer_size = pstore_pmsg_size;
}
/**
* pstore_set() - Initialize PStore settings from command line arguments
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Set pstore reserved memory info, starting at 'addr' for 'len' bytes.
* Default length for records is 4K.
* Mandatory arguments:
* - addr: ramoops starting address
* - len: ramoops total length
* Optional arguments:
* - record-size: size of one panic or oops record ('dump' type)
* - console-size: size of the kernel logs record
* - ftrace-size: size of the ftrace record(s), this can be a single record or
* divided in parts based on number of CPUs
* - pmsg-size: size of the user space logs record
* - ecc-size: enables/disables ECC support and specifies ECC buffer size in
* bytes (0 disables it, 1 is a special value, means 16 bytes ECC)
*
* Return: zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int pstore_set(struct cmd_tbl *cmdtp, int flag, int argc,
char * const argv[])
{
if (argc < 3)
return CMD_RET_USAGE;
/* Address is specified since argc > 2
*/
pstore_addr = simple_strtoul(argv[1], NULL, 16);
/* Length is specified since argc > 2
*/
pstore_length = simple_strtoul(argv[2], NULL, 16);
if (argc > 3)
pstore_record_size = simple_strtoul(argv[3], NULL, 16);
if (argc > 4)
pstore_console_size = simple_strtoul(argv[4], NULL, 16);
if (argc > 5)
pstore_ftrace_size = simple_strtoul(argv[5], NULL, 16);
if (argc > 6)
pstore_pmsg_size = simple_strtoul(argv[6], NULL, 16);
if (argc > 7)
pstore_ecc_size = simple_strtoul(argv[7], NULL, 16);
if (pstore_length < (pstore_record_size + pstore_console_size
+ pstore_ftrace_size + pstore_pmsg_size)) {
printf("pstore <len> should be larger than the sum of all records sizes\n");
pstore_length = 0;
}
log_debug("pstore set done: start 0x%08llx - length 0x%llx\n",
(unsigned long long)pstore_addr,
(unsigned long long)pstore_length);
return 0;
}
/**
* pstore_print_buffer() - Print buffer
* @type: buffer type
* @buffer: buffer to print
* @size: buffer size
*
* Print buffer type and content
*/
static void pstore_print_buffer(char *type, char *buffer, u32 size)
{
u32 i = 0;
printf("**** %s\n", type);
while (i < size && buffer[i] != 0) {
putc(buffer[i]);
i++;
}
}
/**
* pstore_display() - Display existing records in pstore reserved memory
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* A 'record-type' can be given to only display records of this kind.
* If no 'record-type' is given, all valid records are dispayed.
* 'record-type' can be one of 'dump', 'console', 'ftrace' or 'user'. For 'dump'
* and 'ftrace' types, a 'nb' can be given to only display one record.
*
* Return: zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int pstore_display(struct cmd_tbl *cmdtp, int flag, int argc,
char * const argv[])
{
int type = PSTORE_TYPE_ALL;
phys_addr_t ptr;
char *buffer;
u32 size;
int header_len = 0;
bool compressed;
if (argc > 1) {
if (!strcmp(argv[1], "dump"))
type = PSTORE_TYPE_DMESG;
else if (!strcmp(argv[1], "console"))
type = PSTORE_TYPE_CONSOLE;
else if (!strcmp(argv[1], "ftrace"))
type = PSTORE_TYPE_FTRACE;
else if (!strcmp(argv[1], "user"))
type = PSTORE_TYPE_PMSG;
else
return CMD_RET_USAGE;
}
if (pstore_length == 0) {
printf("Please set PStore configuration\n");
return CMD_RET_USAGE;
}
if (buffer_size == 0)
pstore_init_buffer_size();
buffer = malloc_cache_aligned(buffer_size);
if (type == PSTORE_TYPE_DMESG || type == PSTORE_TYPE_ALL) {
ptr = pstore_addr;
phys_addr_t ptr_end = ptr + pstore_length - pstore_pmsg_size
- pstore_ftrace_size - pstore_console_size;
if (argc > 2) {
ptr += simple_strtoul(argv[2], NULL, 10)
* pstore_record_size;
ptr_end = ptr + pstore_record_size;
}
while (ptr < ptr_end) {
size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr,
pstore_record_size, buffer);
ptr += pstore_record_size;
if (size == 0)
continue;
header_len = pstore_read_kmsg_hdr(buffer, &compressed);
if (header_len == 0) {
log_debug("no valid kernel header\n");
continue;
}
if (compressed) {
printf("Compressed buffer, display not available\n");
continue;
}
pstore_print_buffer("Dump", buffer + header_len,
size - header_len);
}
}
if (type == PSTORE_TYPE_CONSOLE || type == PSTORE_TYPE_ALL) {
ptr = pstore_addr + pstore_length - pstore_pmsg_size
- pstore_ftrace_size - pstore_console_size;
size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr,
pstore_console_size, buffer);
if (size != 0)
pstore_print_buffer("Console", buffer, size);
}
if (type == PSTORE_TYPE_FTRACE || type == PSTORE_TYPE_ALL) {
ptr = pstore_addr + pstore_length - pstore_pmsg_size
- pstore_ftrace_size;
/* The FTrace record(s) uses LINUX_VERSION_CODE ^ 'DBGC'
* signature, pass 0 to pstore_get_buffer to prevent
* checking it
*/
size = pstore_get_buffer(0, ptr, pstore_ftrace_size, buffer);
if (size != 0)
pstore_print_buffer("FTrace", buffer, size);
}
if (type == PSTORE_TYPE_PMSG || type == PSTORE_TYPE_ALL) {
ptr = pstore_addr + pstore_length - pstore_pmsg_size;
size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr,
pstore_pmsg_size, buffer);
if (size != 0)
pstore_print_buffer("User", buffer, size);
}
free(buffer);
return 0;
}
/**
* pstore_save() - Save existing records from pstore reserved memory
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* the records are saved under 'directory path', which should already exist,
* to partition 'part' on device type 'interface' instance 'dev'
* Filenames are automatically generated, depending on record type, like in
* /sys/fs/pstore under Linux
*
* Return: zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int pstore_save(struct cmd_tbl *cmdtp, int flag, int argc,
char * const argv[])
{
phys_addr_t ptr, ptr_end;
char *buffer;
char *save_argv[6];
char addr[19], length[19];
char path[256];
u32 size;
unsigned int index;
int header_len = 0;
bool compressed;
if (argc < 4)
return CMD_RET_USAGE;
if (pstore_length == 0) {
printf("Please set PStore configuration\n");
return CMD_RET_USAGE;
}
if (buffer_size == 0)
pstore_init_buffer_size();
buffer = malloc_cache_aligned(buffer_size);
sprintf(addr, "0x%p", buffer);
save_argv[0] = argv[0];
save_argv[1] = argv[1];
save_argv[2] = argv[2];
save_argv[3] = addr;
save_argv[4] = path;
save_argv[5] = length;
/* Save all Dump records */
ptr = pstore_addr;
ptr_end = ptr + pstore_length - pstore_pmsg_size - pstore_ftrace_size
- pstore_console_size;
index = 0;
while (ptr < ptr_end) {
size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr,
pstore_record_size, buffer);
ptr += pstore_record_size;
if (size == 0)
continue;
header_len = pstore_read_kmsg_hdr(buffer, &compressed);
if (header_len == 0) {
log_debug("no valid kernel header\n");
continue;
}
sprintf(addr, "0x%08lx", (ulong)map_to_sysmem(buffer + header_len));
sprintf(length, "0x%X", size - header_len);
sprintf(path, "%s/dmesg-ramoops-%u%s", argv[3], index,
compressed ? ".enc.z" : "");
do_save(cmdtp, flag, 6, save_argv, FS_TYPE_ANY);
index++;
}
sprintf(addr, "0x%08lx", (ulong)map_to_sysmem(buffer));
/* Save Console record */
size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr, pstore_console_size,
buffer);
if (size != 0) {
sprintf(length, "0x%X", size);
sprintf(path, "%s/console-ramoops-0", argv[3]);
do_save(cmdtp, flag, 6, save_argv, FS_TYPE_ANY);
}
ptr += pstore_console_size;
/* Save FTrace record(s)
* The FTrace record(s) uses LINUX_VERSION_CODE ^ 'DBGC' signature,
* pass 0 to pstore_get_buffer to prevent checking it
*/
size = pstore_get_buffer(0, ptr, pstore_ftrace_size, buffer);
if (size != 0) {
sprintf(length, "0x%X", size);
sprintf(path, "%s/ftrace-ramoops-0", argv[3]);
do_save(cmdtp, flag, 6, save_argv, FS_TYPE_ANY);
}
ptr += pstore_ftrace_size;
/* Save Console record */
size = pstore_get_buffer(PERSISTENT_RAM_SIG, ptr, pstore_pmsg_size,
buffer);
if (size != 0) {
sprintf(length, "0x%X", size);
sprintf(path, "%s/pmsg-ramoops-0", argv[3]);
do_save(cmdtp, flag, 6, save_argv, FS_TYPE_ANY);
}
free(buffer);
return 0;
}
static struct cmd_tbl cmd_pstore_sub[] = {
U_BOOT_CMD_MKENT(set, 8, 0, pstore_set, "", ""),
U_BOOT_CMD_MKENT(display, 3, 0, pstore_display, "", ""),
U_BOOT_CMD_MKENT(save, 4, 0, pstore_save, "", ""),
};
static int do_pstore(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[])
{
struct cmd_tbl *c;
if (argc < 2)
return CMD_RET_USAGE;
/* Strip off leading argument */
argc--;
argv++;
c = find_cmd_tbl(argv[0], cmd_pstore_sub, ARRAY_SIZE(cmd_pstore_sub));
if (!c)
return CMD_RET_USAGE;
return c->cmd(cmdtp, flag, argc, argv);
}
void fdt_fixup_pstore(void *blob)
{
char node[32];
int nodeoffset; /* node offset from libfdt */
nodeoffset = fdt_path_offset(blob, "/");
if (nodeoffset < 0) {
/* Not found or something else bad happened. */
log_err("fdt_path_offset() returned %s\n", fdt_strerror(nodeoffset));
return;
}
nodeoffset = fdt_add_subnode(blob, nodeoffset, "reserved-memory");
if (nodeoffset < 0) {
log_err("Add 'reserved-memory' node failed: %s\n",
fdt_strerror(nodeoffset));
return;
}
fdt_setprop_u32(blob, nodeoffset, "#address-cells", 2);
fdt_setprop_u32(blob, nodeoffset, "#size-cells", 2);
fdt_setprop_empty(blob, nodeoffset, "ranges");
sprintf(node, "ramoops@%llx", (unsigned long long)pstore_addr);
nodeoffset = fdt_add_subnode(blob, nodeoffset, node);
if (nodeoffset < 0) {
log_err("Add '%s' node failed: %s\n", node, fdt_strerror(nodeoffset));
return;
}
fdt_setprop_string(blob, nodeoffset, "compatible", "ramoops");
fdt_setprop_u64(blob, nodeoffset, "reg", pstore_addr);
fdt_appendprop_u64(blob, nodeoffset, "reg", pstore_length);
fdt_setprop_u32(blob, nodeoffset, "record-size", pstore_record_size);
fdt_setprop_u32(blob, nodeoffset, "console-size", pstore_console_size);
fdt_setprop_u32(blob, nodeoffset, "ftrace-size", pstore_ftrace_size);
fdt_setprop_u32(blob, nodeoffset, "pmsg-size", pstore_pmsg_size);
fdt_setprop_u32(blob, nodeoffset, "ecc-size", pstore_ecc_size);
}
U_BOOT_CMD(pstore, 10, 0, do_pstore,
"Manage Linux Persistent Storage",
"set <addr> <len> [record-size] [console-size] [ftrace-size] [pmsg_size] [ecc-size]\n"
"- Set pstore reserved memory info, starting at 'addr' for 'len' bytes.\n"
" Default length for records is 4K.\n"
" 'record-size' is the size of one panic or oops record ('dump' type).\n"
" 'console-size' is the size of the kernel logs record.\n"
" 'ftrace-size' is the size of the ftrace record(s), this can be a single\n"
" record or divided in parts based on number of CPUs.\n"
" 'pmsg-size' is the size of the user space logs record.\n"
" 'ecc-size' enables/disables ECC support and specifies ECC buffer size in\n"
" bytes (0 disables it, 1 is a special value, means 16 bytes ECC).\n"
"pstore display [record-type] [nb]\n"
"- Display existing records in pstore reserved memory. A 'record-type' can\n"
" be given to only display records of this kind. 'record-type' can be one\n"
" of 'dump', 'console', 'ftrace' or 'user'. For 'dump' and 'ftrace' types,\n"
" a 'nb' can be given to only display one record.\n"
"pstore save <interface> <dev[:part]> <directory-path>\n"
"- Save existing records in pstore reserved memory under 'directory path'\n"
" to partition 'part' on device type 'interface' instance 'dev'.\n"
" Filenames are automatically generated, depending on record type, like\n"
" in /sys/fs/pstore under Linux.\n"
" The 'directory-path' should already exist.\n"
);