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arm64: Add an aliasing facility for the idreg override

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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 <maz@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: David Brazdil <dbrazdil@google.com>
Link: https://lore.kernel.org/r/20210208095732.3267263-17-maz@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Marc Zyngier 2021-02-08 09:57:25 +00:00 committed by Will Deacon
parent 41fac42c25
commit 863ace77e9
1 changed files with 14 additions and 3 deletions
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17
arch/arm64/kernel/idreg-override.c
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@ -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 */