From 863ace77e9ff85c06d57e9491faffae8512070de Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Mon, 8 Feb 2021 09:57:25 +0000 Subject: [PATCH] arm64: Add an aliasing facility for the idreg override In order to map the override of idregs to options that a user can easily understand, let's introduce yet another option array, which maps an option to the corresponding idreg options. Signed-off-by: Marc Zyngier Reviewed-by: Catalin Marinas Acked-by: David Brazdil Link: https://lore.kernel.org/r/20210208095732.3267263-17-maz@kernel.org Signed-off-by: Will Deacon --- arch/arm64/kernel/idreg-override.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kernel/idreg-override.c b/arch/arm64/kernel/idreg-override.c index 2da11bf60195..226bac544e20 100644 --- a/arch/arm64/kernel/idreg-override.c +++ b/arch/arm64/kernel/idreg-override.c @@ -16,6 +16,8 @@ #define FTR_DESC_NAME_LEN 20 #define FTR_DESC_FIELD_LEN 10 +#define FTR_ALIAS_NAME_LEN 30 +#define FTR_ALIAS_OPTION_LEN 80 struct ftr_set_desc { char name[FTR_DESC_NAME_LEN]; @@ -39,6 +41,12 @@ static const struct ftr_set_desc * const regs[] __initconst = { &mmfr1, }; +static const struct { + char alias[FTR_ALIAS_NAME_LEN]; + char feature[FTR_ALIAS_OPTION_LEN]; +} aliases[] __initconst = { +}; + static int __init find_field(const char *cmdline, const struct ftr_set_desc *reg, int f, u64 *v) { @@ -81,7 +89,7 @@ static void __init match_options(const char *cmdline) } } -static __init void __parse_cmdline(const char *cmdline) +static __init void __parse_cmdline(const char *cmdline, bool parse_aliases) { do { char buf[256]; @@ -105,6 +113,9 @@ static __init void __parse_cmdline(const char *cmdline) match_options(buf); + for (i = 0; parse_aliases && i < ARRAY_SIZE(aliases); i++) + if (parameq(buf, aliases[i].alias)) + __parse_cmdline(aliases[i].feature, false); } while (1); } @@ -127,14 +138,14 @@ static __init void parse_cmdline(void) if (!prop) goto out; - __parse_cmdline(prop); + __parse_cmdline(prop, true); if (!IS_ENABLED(CONFIG_CMDLINE_EXTEND)) return; } out: - __parse_cmdline(CONFIG_CMDLINE); + __parse_cmdline(CONFIG_CMDLINE, true); } /* Keep checkers quiet */ -- GitLab