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Date: Mon, 22 Mar 2021 16:15:00 +0000
From: Daniel Thompson <daniel.thompson@...aro.org>
To: Sumit Garg <sumit.garg@...aro.org>
Cc: kgdb-bugreport@...ts.sourceforge.net, jason.wessel@...driver.com,
dianders@...omium.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] kdb: Simplify kdb commands registration
On Wed, Feb 24, 2021 at 12:38:27PM +0530, Sumit Garg wrote:
> Simplify kdb commands registration via using linked list instead of
> static array for commands storage.
>
> Signed-off-by: Sumit Garg <sumit.garg@...aro.org>
Applied, thanks!
> ---
>
> Changes in v5:
> - Introduce new method: kdb_register_table() to register static kdb
> main and breakpoint command tables instead of using statically
> allocated commands.
>
> Changes in v4:
> - Fix kdb commands memory allocation issue prior to slab being available
> with an array of statically allocated commands. Now it works fine with
> kgdbwait.
> - Fix a misc checkpatch warning.
> - I have dropped Doug's review tag as I think this version includes a
> major fix that should be reviewed again.
>
> Changes in v3:
> - Remove redundant "if" check.
> - Pick up review tag from Doug.
>
> Changes in v2:
> - Remove redundant NULL check for "cmd_name".
> - Incorporate misc. comment.
>
> kernel/debug/kdb/kdb_bp.c | 81 ++++--
> kernel/debug/kdb/kdb_main.c | 472 ++++++++++++++++++++-------------
> kernel/debug/kdb/kdb_private.h | 3 +
> 3 files changed, 343 insertions(+), 213 deletions(-)
>
> diff --git a/kernel/debug/kdb/kdb_bp.c b/kernel/debug/kdb/kdb_bp.c
> index ec4940146612..c15a1c6abfd6 100644
> --- a/kernel/debug/kdb/kdb_bp.c
> +++ b/kernel/debug/kdb/kdb_bp.c
> @@ -522,6 +522,60 @@ static int kdb_ss(int argc, const char **argv)
> return KDB_CMD_SS;
> }
>
> +static kdbtab_t bptab[] = {
> + { .cmd_name = "bp",
> + .cmd_func = kdb_bp,
> + .cmd_usage = "[<vaddr>]",
> + .cmd_help = "Set/Display breakpoints",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
> + },
> + { .cmd_name = "bl",
> + .cmd_func = kdb_bp,
> + .cmd_usage = "[<vaddr>]",
> + .cmd_help = "Display breakpoints",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
> + },
> + { .cmd_name = "bc",
> + .cmd_func = kdb_bc,
> + .cmd_usage = "<bpnum>",
> + .cmd_help = "Clear Breakpoint",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_FLOW_CTRL,
> + },
> + { .cmd_name = "be",
> + .cmd_func = kdb_bc,
> + .cmd_usage = "<bpnum>",
> + .cmd_help = "Enable Breakpoint",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_FLOW_CTRL,
> + },
> + { .cmd_name = "bd",
> + .cmd_func = kdb_bc,
> + .cmd_usage = "<bpnum>",
> + .cmd_help = "Disable Breakpoint",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_FLOW_CTRL,
> + },
> + { .cmd_name = "ss",
> + .cmd_func = kdb_ss,
> + .cmd_usage = "",
> + .cmd_help = "Single Step",
> + .cmd_minlen = 1,
> + .cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
> + },
> +};
> +
> +static kdbtab_t bphcmd = {
> + .cmd_name = "bph",
> + .cmd_func = kdb_bp,
> + .cmd_usage = "[<vaddr>]",
> + .cmd_help = "[datar [length]|dataw [length]] Set hw brk",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS,
> +};
> +
> /* Initialize the breakpoint table and register breakpoint commands. */
>
> void __init kdb_initbptab(void)
> @@ -537,30 +591,7 @@ void __init kdb_initbptab(void)
> for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++)
> bp->bp_free = 1;
>
> - kdb_register_flags("bp", kdb_bp, "[<vaddr>]",
> - "Set/Display breakpoints", 0,
> - KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS);
> - kdb_register_flags("bl", kdb_bp, "[<vaddr>]",
> - "Display breakpoints", 0,
> - KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS);
> + kdb_register_table(bptab, ARRAY_SIZE(bptab));
> if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT)
> - kdb_register_flags("bph", kdb_bp, "[<vaddr>]",
> - "[datar [length]|dataw [length]] Set hw brk", 0,
> - KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS);
> - kdb_register_flags("bc", kdb_bc, "<bpnum>",
> - "Clear Breakpoint", 0,
> - KDB_ENABLE_FLOW_CTRL);
> - kdb_register_flags("be", kdb_bc, "<bpnum>",
> - "Enable Breakpoint", 0,
> - KDB_ENABLE_FLOW_CTRL);
> - kdb_register_flags("bd", kdb_bc, "<bpnum>",
> - "Disable Breakpoint", 0,
> - KDB_ENABLE_FLOW_CTRL);
> -
> - kdb_register_flags("ss", kdb_ss, "",
> - "Single Step", 1,
> - KDB_ENABLE_FLOW_CTRL | KDB_REPEAT_NO_ARGS);
> - /*
> - * Architecture dependent initialization.
> - */
> + kdb_register_table(&bphcmd, 1);
> }
> diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
> index 930ac1b25ec7..1e0c2c37df94 100644
> --- a/kernel/debug/kdb/kdb_main.c
> +++ b/kernel/debug/kdb/kdb_main.c
> @@ -33,6 +33,7 @@
> #include <linux/kallsyms.h>
> #include <linux/kgdb.h>
> #include <linux/kdb.h>
> +#include <linux/list.h>
> #include <linux/notifier.h>
> #include <linux/interrupt.h>
> #include <linux/delay.h>
> @@ -84,15 +85,8 @@ static unsigned int kdb_continue_catastrophic =
> static unsigned int kdb_continue_catastrophic;
> #endif
>
> -/* kdb_commands describes the available commands. */
> -static kdbtab_t *kdb_commands;
> -#define KDB_BASE_CMD_MAX 50
> -static int kdb_max_commands = KDB_BASE_CMD_MAX;
> -static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
> -#define for_each_kdbcmd(cmd, num) \
> - for ((cmd) = kdb_base_commands, (num) = 0; \
> - num < kdb_max_commands; \
> - num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
> +/* kdb_cmds_head describes the available commands. */
> +static LIST_HEAD(kdb_cmds_head);
>
> typedef struct _kdbmsg {
> int km_diag; /* kdb diagnostic */
> @@ -921,7 +915,7 @@ int kdb_parse(const char *cmdstr)
> char *cp;
> char *cpp, quoted;
> kdbtab_t *tp;
> - int i, escaped, ignore_errors = 0, check_grep = 0;
> + int escaped, ignore_errors = 0, check_grep = 0;
>
> /*
> * First tokenize the command string.
> @@ -1011,25 +1005,17 @@ int kdb_parse(const char *cmdstr)
> ++argv[0];
> }
>
> - for_each_kdbcmd(tp, i) {
> - if (tp->cmd_name) {
> - /*
> - * If this command is allowed to be abbreviated,
> - * check to see if this is it.
> - */
> -
> - if (tp->cmd_minlen
> - && (strlen(argv[0]) <= tp->cmd_minlen)) {
> - if (strncmp(argv[0],
> - tp->cmd_name,
> - tp->cmd_minlen) == 0) {
> - break;
> - }
> - }
> + list_for_each_entry(tp, &kdb_cmds_head, list_node) {
> + /*
> + * If this command is allowed to be abbreviated,
> + * check to see if this is it.
> + */
> + if (tp->cmd_minlen && (strlen(argv[0]) <= tp->cmd_minlen) &&
> + (strncmp(argv[0], tp->cmd_name, tp->cmd_minlen) == 0))
> + break;
>
> - if (strcmp(argv[0], tp->cmd_name) == 0)
> - break;
> - }
> + if (strcmp(argv[0], tp->cmd_name) == 0)
> + break;
> }
>
> /*
> @@ -1037,19 +1023,15 @@ int kdb_parse(const char *cmdstr)
> * few characters of this match any of the known commands.
> * e.g., md1c20 should match md.
> */
> - if (i == kdb_max_commands) {
> - for_each_kdbcmd(tp, i) {
> - if (tp->cmd_name) {
> - if (strncmp(argv[0],
> - tp->cmd_name,
> - strlen(tp->cmd_name)) == 0) {
> - break;
> - }
> - }
> + if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
> + list_for_each_entry(tp, &kdb_cmds_head, list_node) {
> + if (strncmp(argv[0], tp->cmd_name,
> + strlen(tp->cmd_name)) == 0)
> + break;
> }
> }
>
> - if (i < kdb_max_commands) {
> + if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
> int result;
>
> if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
> @@ -2428,17 +2410,14 @@ static int kdb_kgdb(int argc, const char **argv)
> static int kdb_help(int argc, const char **argv)
> {
> kdbtab_t *kt;
> - int i;
>
> kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
> kdb_printf("-----------------------------"
> "-----------------------------\n");
> - for_each_kdbcmd(kt, i) {
> + list_for_each_entry(kt, &kdb_cmds_head, list_node) {
> char *space = "";
> if (KDB_FLAG(CMD_INTERRUPT))
> return 0;
> - if (!kt->cmd_name)
> - continue;
> if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
> continue;
> if (strlen(kt->cmd_usage) > 20)
> @@ -2659,7 +2638,6 @@ static int kdb_grep_help(int argc, const char **argv)
> * Returns:
> * zero for success, one if a duplicate command.
> */
> -#define kdb_command_extend 50 /* arbitrary */
> int kdb_register_flags(char *cmd,
> kdb_func_t func,
> char *usage,
> @@ -2667,49 +2645,20 @@ int kdb_register_flags(char *cmd,
> short minlen,
> kdb_cmdflags_t flags)
> {
> - int i;
> kdbtab_t *kp;
>
> - /*
> - * Brute force method to determine duplicates
> - */
> - for_each_kdbcmd(kp, i) {
> - if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
> + list_for_each_entry(kp, &kdb_cmds_head, list_node) {
> + if (strcmp(kp->cmd_name, cmd) == 0) {
> kdb_printf("Duplicate kdb command registered: "
> "%s, func %px help %s\n", cmd, func, help);
> return 1;
> }
> }
>
> - /*
> - * Insert command into first available location in table
> - */
> - for_each_kdbcmd(kp, i) {
> - if (kp->cmd_name == NULL)
> - break;
> - }
> -
> - if (i >= kdb_max_commands) {
> - kdbtab_t *new = kmalloc_array(kdb_max_commands -
> - KDB_BASE_CMD_MAX +
> - kdb_command_extend,
> - sizeof(*new),
> - GFP_KDB);
> - if (!new) {
> - kdb_printf("Could not allocate new kdb_command "
> - "table\n");
> - return 1;
> - }
> - if (kdb_commands) {
> - memcpy(new, kdb_commands,
> - (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
> - kfree(kdb_commands);
> - }
> - memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
> - kdb_command_extend * sizeof(*new));
> - kdb_commands = new;
> - kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
> - kdb_max_commands += kdb_command_extend;
> + kp = kmalloc(sizeof(*kp), GFP_KDB);
> + if (!kp) {
> + kdb_printf("Could not allocate new kdb_command table\n");
> + return 1;
> }
>
> kp->cmd_name = cmd;
> @@ -2718,11 +2667,27 @@ int kdb_register_flags(char *cmd,
> kp->cmd_help = help;
> kp->cmd_minlen = minlen;
> kp->cmd_flags = flags;
> + kp->is_dynamic = true;
> +
> + list_add_tail(&kp->list_node, &kdb_cmds_head);
>
> return 0;
> }
> EXPORT_SYMBOL_GPL(kdb_register_flags);
>
> +/*
> + * kdb_register_table() - This function is used to register a kdb command
> + * table.
> + * @kp: pointer to kdb command table
> + * @len: length of kdb command table
> + */
> +void kdb_register_table(kdbtab_t *kp, size_t len)
> +{
> + while (len--) {
> + list_add_tail(&kp->list_node, &kdb_cmds_head);
> + kp++;
> + }
> +}
>
> /*
> * kdb_register - Compatibility register function for commands that do
> @@ -2757,15 +2722,16 @@ EXPORT_SYMBOL_GPL(kdb_register);
> */
> int kdb_unregister(char *cmd)
> {
> - int i;
> kdbtab_t *kp;
>
> /*
> * find the command.
> */
> - for_each_kdbcmd(kp, i) {
> - if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
> - kp->cmd_name = NULL;
> + list_for_each_entry(kp, &kdb_cmds_head, list_node) {
> + if (strcmp(kp->cmd_name, cmd) == 0) {
> + list_del(&kp->list_node);
> + if (kp->is_dynamic)
> + kfree(kp);
> return 0;
> }
> }
> @@ -2775,118 +2741,248 @@ int kdb_unregister(char *cmd)
> }
> EXPORT_SYMBOL_GPL(kdb_unregister);
>
> -/* Initialize the kdb command table. */
> -static void __init kdb_inittab(void)
> -{
> - int i;
> - kdbtab_t *kp;
> -
> - for_each_kdbcmd(kp, i)
> - kp->cmd_name = NULL;
> -
> - kdb_register_flags("md", kdb_md, "<vaddr>",
> - "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
> - KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
> - kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
> - "Display Raw Memory", 0,
> - KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
> - kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
> - "Display Physical Memory", 0,
> - KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
> - kdb_register_flags("mds", kdb_md, "<vaddr>",
> - "Display Memory Symbolically", 0,
> - KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
> - kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
> - "Modify Memory Contents", 0,
> - KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
> - kdb_register_flags("go", kdb_go, "[<vaddr>]",
> - "Continue Execution", 1,
> - KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
> - kdb_register_flags("rd", kdb_rd, "",
> - "Display Registers", 0,
> - KDB_ENABLE_REG_READ);
> - kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
> - "Modify Registers", 0,
> - KDB_ENABLE_REG_WRITE);
> - kdb_register_flags("ef", kdb_ef, "<vaddr>",
> - "Display exception frame", 0,
> - KDB_ENABLE_MEM_READ);
> - kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
> - "Stack traceback", 1,
> - KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
> - kdb_register_flags("btp", kdb_bt, "<pid>",
> - "Display stack for process <pid>", 0,
> - KDB_ENABLE_INSPECT);
> - kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
> - "Backtrace all processes matching state flag", 0,
> - KDB_ENABLE_INSPECT);
> - kdb_register_flags("btc", kdb_bt, "",
> - "Backtrace current process on each cpu", 0,
> - KDB_ENABLE_INSPECT);
> - kdb_register_flags("btt", kdb_bt, "<vaddr>",
> - "Backtrace process given its struct task address", 0,
> - KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
> - kdb_register_flags("env", kdb_env, "",
> - "Show environment variables", 0,
> - KDB_ENABLE_ALWAYS_SAFE);
> - kdb_register_flags("set", kdb_set, "",
> - "Set environment variables", 0,
> - KDB_ENABLE_ALWAYS_SAFE);
> - kdb_register_flags("help", kdb_help, "",
> - "Display Help Message", 1,
> - KDB_ENABLE_ALWAYS_SAFE);
> - kdb_register_flags("?", kdb_help, "",
> - "Display Help Message", 0,
> - KDB_ENABLE_ALWAYS_SAFE);
> - kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
> - "Switch to new cpu", 0,
> - KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
> - kdb_register_flags("kgdb", kdb_kgdb, "",
> - "Enter kgdb mode", 0, 0);
> - kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
> - "Display active task list", 0,
> - KDB_ENABLE_INSPECT);
> - kdb_register_flags("pid", kdb_pid, "<pidnum>",
> - "Switch to another task", 0,
> - KDB_ENABLE_INSPECT);
> - kdb_register_flags("reboot", kdb_reboot, "",
> - "Reboot the machine immediately", 0,
> - KDB_ENABLE_REBOOT);
> +static kdbtab_t maintab[] = {
> + { .cmd_name = "md",
> + .cmd_func = kdb_md,
> + .cmd_usage = "<vaddr>",
> + .cmd_help = "Display Memory Contents, also mdWcN, e.g. md8c1",
> + .cmd_minlen = 1,
> + .cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
> + },
> + { .cmd_name = "mdr",
> + .cmd_func = kdb_md,
> + .cmd_usage = "<vaddr> <bytes>",
> + .cmd_help = "Display Raw Memory",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
> + },
> + { .cmd_name = "mdp",
> + .cmd_func = kdb_md,
> + .cmd_usage = "<paddr> <bytes>",
> + .cmd_help = "Display Physical Memory",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
> + },
> + { .cmd_name = "mds",
> + .cmd_func = kdb_md,
> + .cmd_usage = "<vaddr>",
> + .cmd_help = "Display Memory Symbolically",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
> + },
> + { .cmd_name = "mm",
> + .cmd_func = kdb_mm,
> + .cmd_usage = "<vaddr> <contents>",
> + .cmd_help = "Modify Memory Contents",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
> + },
> + { .cmd_name = "go",
> + .cmd_func = kdb_go,
> + .cmd_usage = "[<vaddr>]",
> + .cmd_help = "Continue Execution",
> + .cmd_minlen = 1,
> + .cmd_flags = KDB_ENABLE_REG_WRITE |
> + KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
> + },
> + { .cmd_name = "rd",
> + .cmd_func = kdb_rd,
> + .cmd_usage = "",
> + .cmd_help = "Display Registers",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_REG_READ,
> + },
> + { .cmd_name = "rm",
> + .cmd_func = kdb_rm,
> + .cmd_usage = "<reg> <contents>",
> + .cmd_help = "Modify Registers",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_REG_WRITE,
> + },
> + { .cmd_name = "ef",
> + .cmd_func = kdb_ef,
> + .cmd_usage = "<vaddr>",
> + .cmd_help = "Display exception frame",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_MEM_READ,
> + },
> + { .cmd_name = "bt",
> + .cmd_func = kdb_bt,
> + .cmd_usage = "[<vaddr>]",
> + .cmd_help = "Stack traceback",
> + .cmd_minlen = 1,
> + .cmd_flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
> + },
> + { .cmd_name = "btp",
> + .cmd_func = kdb_bt,
> + .cmd_usage = "<pid>",
> + .cmd_help = "Display stack for process <pid>",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_INSPECT,
> + },
> + { .cmd_name = "bta",
> + .cmd_func = kdb_bt,
> + .cmd_usage = "[D|R|S|T|C|Z|E|U|I|M|A]",
> + .cmd_help = "Backtrace all processes matching state flag",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_INSPECT,
> + },
> + { .cmd_name = "btc",
> + .cmd_func = kdb_bt,
> + .cmd_usage = "",
> + .cmd_help = "Backtrace current process on each cpu",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_INSPECT,
> + },
> + { .cmd_name = "btt",
> + .cmd_func = kdb_bt,
> + .cmd_usage = "<vaddr>",
> + .cmd_help = "Backtrace process given its struct task address",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
> + },
> + { .cmd_name = "env",
> + .cmd_func = kdb_env,
> + .cmd_usage = "",
> + .cmd_help = "Show environment variables",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> + { .cmd_name = "set",
> + .cmd_func = kdb_set,
> + .cmd_usage = "",
> + .cmd_help = "Set environment variables",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> + { .cmd_name = "help",
> + .cmd_func = kdb_help,
> + .cmd_usage = "",
> + .cmd_help = "Display Help Message",
> + .cmd_minlen = 1,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> + { .cmd_name = "?",
> + .cmd_func = kdb_help,
> + .cmd_usage = "",
> + .cmd_help = "Display Help Message",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> + { .cmd_name = "cpu",
> + .cmd_func = kdb_cpu,
> + .cmd_usage = "<cpunum>",
> + .cmd_help = "Switch to new cpu",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
> + },
> + { .cmd_name = "kgdb",
> + .cmd_func = kdb_kgdb,
> + .cmd_usage = "",
> + .cmd_help = "Enter kgdb mode",
> + .cmd_minlen = 0,
> + .cmd_flags = 0,
> + },
> + { .cmd_name = "ps",
> + .cmd_func = kdb_ps,
> + .cmd_usage = "[<flags>|A]",
> + .cmd_help = "Display active task list",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_INSPECT,
> + },
> + { .cmd_name = "pid",
> + .cmd_func = kdb_pid,
> + .cmd_usage = "<pidnum>",
> + .cmd_help = "Switch to another task",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_INSPECT,
> + },
> + { .cmd_name = "reboot",
> + .cmd_func = kdb_reboot,
> + .cmd_usage = "",
> + .cmd_help = "Reboot the machine immediately",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_REBOOT,
> + },
> #if defined(CONFIG_MODULES)
> - kdb_register_flags("lsmod", kdb_lsmod, "",
> - "List loaded kernel modules", 0,
> - KDB_ENABLE_INSPECT);
> + { .cmd_name = "lsmod",
> + .cmd_func = kdb_lsmod,
> + .cmd_usage = "",
> + .cmd_help = "List loaded kernel modules",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_INSPECT,
> + },
> #endif
> #if defined(CONFIG_MAGIC_SYSRQ)
> - kdb_register_flags("sr", kdb_sr, "<key>",
> - "Magic SysRq key", 0,
> - KDB_ENABLE_ALWAYS_SAFE);
> + { .cmd_name = "sr",
> + .cmd_func = kdb_sr,
> + .cmd_usage = "<key>",
> + .cmd_help = "Magic SysRq key",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> #endif
> #if defined(CONFIG_PRINTK)
> - kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
> - "Display syslog buffer", 0,
> - KDB_ENABLE_ALWAYS_SAFE);
> + { .cmd_name = "dmesg",
> + .cmd_func = kdb_dmesg,
> + .cmd_usage = "[lines]",
> + .cmd_help = "Display syslog buffer",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> #endif
> - if (arch_kgdb_ops.enable_nmi) {
> - kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
> - "Disable NMI entry to KDB", 0,
> - KDB_ENABLE_ALWAYS_SAFE);
> - }
> - kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
> - "Define a set of commands, down to endefcmd", 0,
> - KDB_ENABLE_ALWAYS_SAFE);
> - kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
> - "Send a signal to a process", 0,
> - KDB_ENABLE_SIGNAL);
> - kdb_register_flags("summary", kdb_summary, "",
> - "Summarize the system", 4,
> - KDB_ENABLE_ALWAYS_SAFE);
> - kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
> - "Display per_cpu variables", 3,
> - KDB_ENABLE_MEM_READ);
> - kdb_register_flags("grephelp", kdb_grep_help, "",
> - "Display help on | grep", 0,
> - KDB_ENABLE_ALWAYS_SAFE);
> + { .cmd_name = "defcmd",
> + .cmd_func = kdb_defcmd,
> + .cmd_usage = "name \"usage\" \"help\"",
> + .cmd_help = "Define a set of commands, down to endefcmd",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> + { .cmd_name = "kill",
> + .cmd_func = kdb_kill,
> + .cmd_usage = "<-signal> <pid>",
> + .cmd_help = "Send a signal to a process",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_SIGNAL,
> + },
> + { .cmd_name = "summary",
> + .cmd_func = kdb_summary,
> + .cmd_usage = "",
> + .cmd_help = "Summarize the system",
> + .cmd_minlen = 4,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> + { .cmd_name = "per_cpu",
> + .cmd_func = kdb_per_cpu,
> + .cmd_usage = "<sym> [<bytes>] [<cpu>]",
> + .cmd_help = "Display per_cpu variables",
> + .cmd_minlen = 3,
> + .cmd_flags = KDB_ENABLE_MEM_READ,
> + },
> + { .cmd_name = "grephelp",
> + .cmd_func = kdb_grep_help,
> + .cmd_usage = "",
> + .cmd_help = "Display help on | grep",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> + },
> +};
> +
> +static kdbtab_t nmicmd = {
> + .cmd_name = "disable_nmi",
> + .cmd_func = kdb_disable_nmi,
> + .cmd_usage = "",
> + .cmd_help = "Disable NMI entry to KDB",
> + .cmd_minlen = 0,
> + .cmd_flags = KDB_ENABLE_ALWAYS_SAFE,
> +};
> +
> +/* Initialize the kdb command table. */
> +static void __init kdb_inittab(void)
> +{
> + kdb_register_table(maintab, ARRAY_SIZE(maintab));
> + if (arch_kgdb_ops.enable_nmi)
> + kdb_register_table(&nmicmd, 1);
> }
>
> /* Execute any commands defined in kdb_cmds. */
> diff --git a/kernel/debug/kdb/kdb_private.h b/kernel/debug/kdb/kdb_private.h
> index a4281fb99299..2d4030fa56cf 100644
> --- a/kernel/debug/kdb/kdb_private.h
> +++ b/kernel/debug/kdb/kdb_private.h
> @@ -174,8 +174,11 @@ typedef struct _kdbtab {
> short cmd_minlen; /* Minimum legal # command
> * chars required */
> kdb_cmdflags_t cmd_flags; /* Command behaviour flags */
> + struct list_head list_node; /* Command list */
> + bool is_dynamic; /* Command table allocation type */
> } kdbtab_t;
>
> +extern void kdb_register_table(kdbtab_t *kp, size_t len);
> extern int kdb_bt(int, const char **); /* KDB display back trace */
>
> /* KDB breakpoint management functions */
> --
> 2.25.1
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