[PATCH v2] commands: add new of_fixup command to list and disable DT fixups
Sascha Hauer
sha at pengutronix.de
Tue May 2 04:47:44 PDT 2023
On Thu, Apr 20, 2023 at 10:32:19PM +0200, Ahmad Fatoum wrote:
> barebox can already dry run fixups with of_diff - +, but there's no way
> to selectively disable a fixup to rule out it causing issues.
>
> For platforms supporting kallsyms, we can readily allow enabling
> and disabling fixups by name, so let's add a command that does just that
> to aid in debugging.
>
> Suggested-by: Daniel Brát <danek.brat at gmail.com>
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
> v1 -> v2:
> - extend commit message a bit
> - fix typo (Sascha)
> - drop CONFIG_OF_FIXUP_TOGGLE
> - print warning message when all specified fixups are non-existent
> ---
Applied, thanks
Sascha
> commands/Kconfig | 14 +++++++
> commands/Makefile | 1 +
> commands/of_fixup.c | 93 +++++++++++++++++++++++++++++++++++++++++++++
> common/kallsyms.c | 8 ++--
> common/oftree.c | 14 ++++---
> include/kallsyms.h | 4 ++
> include/of.h | 10 +++++
> 7 files changed, 134 insertions(+), 10 deletions(-)
> create mode 100644 commands/of_fixup.c
>
> diff --git a/commands/Kconfig b/commands/Kconfig
> index e4452cd42d45..3becc88129c1 100644
> --- a/commands/Kconfig
> +++ b/commands/Kconfig
> @@ -2283,6 +2283,20 @@ config CMD_OF_DISPLAY_TIMINGS
> -s path select display-timings and register oftree fixup
> -f dtb work on dtb. Has no effect on -s option
>
> +config CMD_OF_FIXUP
> + tristate
> + select OFTREE
> + depends on KALLSYMS
> + prompt "of_fixup"
> + help
> + List and enable/disable fixups
> +
> + Usage: of_fixup [-de] [fixups...]
> +
> + Options:
> + -d disable fixup
> + -e re-enable fixup
> +
> config CMD_OF_FIXUP_STATUS
> tristate
> select OFTREE
> diff --git a/commands/Makefile b/commands/Makefile
> index ec59137d7e12..0ac84076f83d 100644
> --- a/commands/Makefile
> +++ b/commands/Makefile
> @@ -88,6 +88,7 @@ obj-$(CONFIG_CMD_OF_PROPERTY) += of_property.o
> obj-$(CONFIG_CMD_OF_NODE) += of_node.o
> obj-$(CONFIG_CMD_OF_DUMP) += of_dump.o
> obj-$(CONFIG_CMD_OF_DISPLAY_TIMINGS) += of_display_timings.o
> +obj-$(CONFIG_CMD_OF_FIXUP) += of_fixup.o
> obj-$(CONFIG_CMD_OF_FIXUP_STATUS) += of_fixup_status.o
> obj-$(CONFIG_CMD_OF_OVERLAY) += of_overlay.o
> obj-$(CONFIG_CMD_MAGICVAR) += magicvar.o
> diff --git a/commands/of_fixup.c b/commands/of_fixup.c
> new file mode 100644
> index 000000000000..d667afb5b107
> --- /dev/null
> +++ b/commands/of_fixup.c
> @@ -0,0 +1,93 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +
> +/*
> + * of_fixup.c - List and remove OF fixups
> + */
> +
> +#include <common.h>
> +#include <kallsyms.h>
> +#include <of.h>
> +#include <command.h>
> +#include <malloc.h>
> +#include <complete.h>
> +#include <getopt.h>
> +#include <string.h>
> +
> +static int do_of_fixup(int argc, char *argv[])
> +{
> + struct of_fixup *of_fixup;
> + int opt, enable = -1;
> + bool did_fixup = false;
> +
> + while ((opt = getopt(argc, argv, "ed")) > 0) {
> + switch (opt) {
> + case 'e':
> + enable = 1;
> + break;
> + case 'd':
> + enable = 0;
> + break;
> + default:
> + return COMMAND_ERROR_USAGE;
> + }
> + }
> +
> + argv += optind;
> + argc -= optind;
> +
> + if ((enable < 0 && argc > 0) || (enable >= 0 && argc == 0))
> + return COMMAND_ERROR_USAGE;
> +
> + list_for_each_entry(of_fixup, &of_fixup_list, list) {
> + int i;
> + ulong addr = (ulong)of_fixup->fixup;
> + char sym[KSYM_SYMBOL_LEN];
> + const char *name;
> +
> + name = kallsyms_lookup(addr, NULL, NULL, NULL, sym);
> + if (!name) {
> + sprintf(sym, "<0x%lx>", addr);
> + name = sym;
> + }
> +
> + if (enable == -1) {
> + printf("%s(0x%p)%s\n", name, of_fixup->context,
> + of_fixup->disabled ? " [DISABLED]" : "");
> + continue;
> + }
> +
> + for (i = 0; i < argc; i++) {
> + if (strcmp(name, argv[i]) != 0)
> + continue;
> +
> + of_fixup->disabled = !enable;
> + did_fixup = true;
> + }
> + }
> +
> + if (argc && !did_fixup) {
> + printf("none of the specified fixups found\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +BAREBOX_CMD_HELP_START(of_fixup)
> +BAREBOX_CMD_HELP_TEXT("Disable or re-enable an already registered fixup for the device tree.")
> +BAREBOX_CMD_HELP_TEXT("Call without arguments to list all fixups")
> +BAREBOX_CMD_HELP_TEXT("")
> +BAREBOX_CMD_HELP_TEXT("Options:")
> +BAREBOX_CMD_HELP_OPT("-d", "disable fixup")
> +BAREBOX_CMD_HELP_OPT("-e", "re-enable fixup")
> +BAREBOX_CMD_HELP_OPT("fixups", "List of fixups to enable or disable")
> +BAREBOX_CMD_HELP_END
> +
> +BAREBOX_CMD_START(of_fixup)
> + .cmd = do_of_fixup,
> + BAREBOX_CMD_DESC("list and enable/disable fixups")
> + BAREBOX_CMD_OPTS("[-de] [fixups...]")
> + BAREBOX_CMD_GROUP(CMD_GRP_MISC)
> + BAREBOX_CMD_COMPLETE(empty_complete)
> + BAREBOX_CMD_HELP(cmd_of_fixup_help)
> +BAREBOX_CMD_END
> diff --git a/common/kallsyms.c b/common/kallsyms.c
> index a9b2b9368992..3c5904f8a833 100644
> --- a/common/kallsyms.c
> +++ b/common/kallsyms.c
> @@ -165,10 +165,10 @@ static unsigned long get_symbol_pos(unsigned long addr,
> * It resides in a module.
> * - We also guarantee that modname will be valid until rescheduled.
> */
> -static const char *kallsyms_lookup(unsigned long addr,
> - unsigned long *symbolsize,
> - unsigned long *offset,
> - char **modname, char *namebuf)
> +const char *kallsyms_lookup(unsigned long addr,
> + unsigned long *symbolsize,
> + unsigned long *offset,
> + char **modname, char *namebuf)
> {
> namebuf[KSYM_NAME_LEN - 1] = 0;
> namebuf[0] = 0;
> diff --git a/common/oftree.c b/common/oftree.c
> index 4beadc5aaa89..1f751cc0ac89 100644
> --- a/common/oftree.c
> +++ b/common/oftree.c
> @@ -350,13 +350,12 @@ int of_register_set_status_fixup(const char *path, bool status)
> return of_register_fixup(of_fixup_status, (void *)data);
> }
>
> -struct of_fixup {
> - int (*fixup)(struct device_node *, void *);
> - void *context;
> - struct list_head list;
> -};
> +LIST_HEAD(of_fixup_list);
>
> -static LIST_HEAD(of_fixup_list);
> +static inline bool of_fixup_disabled(struct of_fixup *fixup)
> +{
> + return fixup->disabled;
> +}
>
> int of_register_fixup(int (*fixup)(struct device_node *, void *), void *context)
> {
> @@ -401,6 +400,9 @@ int of_fix_tree(struct device_node *node)
> of_overlay_load_firmware_clear();
>
> list_for_each_entry(of_fixup, &of_fixup_list, list) {
> + if (of_fixup_disabled(of_fixup))
> + continue;
> +
> ret = of_fixup->fixup(node, of_fixup->context);
> if (ret)
> pr_warn("Failed to fixup node in %pS: %s\n",
> diff --git a/include/kallsyms.h b/include/kallsyms.h
> index e0b3ff7cd503..f61efc9e0c42 100644
> --- a/include/kallsyms.h
> +++ b/include/kallsyms.h
> @@ -6,6 +6,10 @@
> #define KSYM_SYMBOL_LEN (sizeof("%s+%#lx/%#lx [%s]") + (KSYM_NAME_LEN - 1) + \
> 2*(BITS_PER_LONG*3/10) + (MODULE_NAME_LEN - 1) + 1)
> unsigned long kallsyms_lookup_name(const char *name);
> +const char *kallsyms_lookup(unsigned long addr,
> + unsigned long *symbolsize,
> + unsigned long *offset,
> + char **modname, char *namebuf);
>
> /* Look up a kernel symbol and return it in a text buffer. */
> int sprint_symbol(char *buffer, unsigned long address);
> diff --git a/include/of.h b/include/of.h
> index 22358f5579ec..5cdea4329330 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -331,6 +331,16 @@ int of_find_path_by_node(struct device_node *node, char **outpath, unsigned flag
> struct device_node *of_find_node_by_devpath(struct device_node *root, const char *path);
> int of_register_fixup(int (*fixup)(struct device_node *, void *), void *context);
> int of_unregister_fixup(int (*fixup)(struct device_node *, void *), void *context);
> +
> +struct of_fixup {
> + int (*fixup)(struct device_node *, void *);
> + void *context;
> + struct list_head list;
> + bool disabled;
> +};
> +
> +extern struct list_head of_fixup_list;
> +
> int of_register_set_status_fixup(const char *node, bool status);
> struct device_node *of_find_node_by_alias(struct device_node *root,
> const char *alias);
> --
> 2.39.2
>
>
>
--
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