linux-kernel - [PATCH v6 15/21] arm64: Add an aliasing facility for the idreg override

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Date:   Mon,  1 Feb 2021 11:56:31 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
        linux-kernel@...r.kernel.org
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Brazdil <dbrazdil@...gle.com>,
        Alexandru Elisei <alexandru.elisei@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Jing Zhang <jingzhangos@...gle.com>,
        Ajay Patil <pajay@....qualcomm.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        Srinivas Ramana <sramana@...eaurora.org>,
        James Morse <james.morse@....com>,
        Julien Thierry <julien.thierry.kdev@...il.com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        kernel-team@...roid.com
Subject: [PATCH v6 15/21] 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 <maz@...nel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@....com>
Acked-by: David Brazdil <dbrazdil@...gle.com>
---
 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 1e4671aa02c8..9658ad6c628a 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 char *cmdline_contains_option(const char *cmdline, const char *option)
 {
 	char *str = strstr(cmdline, option);
@@ -95,7 +103,7 @@ 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];
@@ -119,6 +127,9 @@ static __init void __parse_cmdline(const char *cmdline)
 
 		match_options(buf);
 
+		for (i = 0; parse_aliases && i < ARRAY_SIZE(aliases); i++)
+			if (cmdline_contains_option(buf, aliases[i].alias))
+				__parse_cmdline(aliases[i].feature, false);
 	} while (1);
 }
 
@@ -141,14 +152,14 @@ 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 */
-- 
2.29.2