linux-kernel - [PATCH v4 14/24] crypto: x86/sha

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Message-Id: <20221116041342.3841-15-elliott@hpe.com>
Date:   Tue, 15 Nov 2022 22:13:32 -0600
From:   Robert Elliott <elliott@....com>
To:     herbert@...dor.apana.org.au, davem@...emloft.net,
        tim.c.chen@...ux.intel.com, ap420073@...il.com, ardb@...nel.org,
        Jason@...c4.com, David.Laight@...LAB.COM, ebiggers@...nel.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Robert Elliott <elliott@....com>
Subject: [PATCH v4 14/24] crypto: x86/sha - load based on CPU features

Like commit aa031b8f702e ("crypto: x86/sha512 - load based on CPU
features"), add module aliases for x86-optimized crypto modules:
        sha1, sha256
based on CPU feature bits so udev gets a chance to load them later in
the boot process when the filesystems are all running.

Signed-off-by: Robert Elliott <elliott@....com>

---
v3 put device table SHA_NI entries inside CONFIG_SHAn_NI ifdefs,
ensure builds properly with arch/x86/Kconfig.assembler changed
to not set CONFIG_AS_SHA*_NI
---
 arch/x86/crypto/sha1_ssse3_glue.c   | 15 +++++++++++++++
 arch/x86/crypto/sha256_ssse3_glue.c | 15 +++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/arch/x86/crypto/sha1_ssse3_glue.c b/arch/x86/crypto/sha1_ssse3_glue.c
index 32f3310e19e2..806463f57b6d 100644
--- a/arch/x86/crypto/sha1_ssse3_glue.c
+++ b/arch/x86/crypto/sha1_ssse3_glue.c
@@ -24,6 +24,7 @@
 #include <linux/types.h>
 #include <crypto/sha1.h>
 #include <crypto/sha1_base.h>
+#include <asm/cpu_device_id.h>
 #include <asm/simd.h>
 
 /* avoid kernel_fpu_begin/end scheduler/rcu stalls */
@@ -328,11 +329,25 @@ static void unregister_sha1_ni(void)
 static inline void unregister_sha1_ni(void) { }
 #endif
 
+static const struct x86_cpu_id module_cpu_ids[] = {
+#ifdef CONFIG_AS_SHA1_NI
+	X86_MATCH_FEATURE(X86_FEATURE_SHA_NI, NULL),
+#endif
+	X86_MATCH_FEATURE(X86_FEATURE_AVX2, NULL),
+	X86_MATCH_FEATURE(X86_FEATURE_AVX, NULL),
+	X86_MATCH_FEATURE(X86_FEATURE_SSSE3, NULL),
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, module_cpu_ids);
+
 static int __init sha1_ssse3_mod_init(void)
 {
 	const char *feature_name;
 	int ret;
 
+	if (!x86_match_cpu(module_cpu_ids))
+		return -ENODEV;
+
 #ifdef CONFIG_AS_SHA1_NI
 	/* SHA-NI */
 	if (boot_cpu_has(X86_FEATURE_SHA_NI)) {
diff --git a/arch/x86/crypto/sha256_ssse3_glue.c b/arch/x86/crypto/sha256_ssse3_glue.c
index 839da1b36273..30c8c50c1123 100644
--- a/arch/x86/crypto/sha256_ssse3_glue.c
+++ b/arch/x86/crypto/sha256_ssse3_glue.c
@@ -38,6 +38,7 @@
 #include <crypto/sha2.h>
 #include <crypto/sha256_base.h>
 #include <linux/string.h>
+#include <asm/cpu_device_id.h>
 #include <asm/simd.h>
 
 /* avoid kernel_fpu_begin/end scheduler/rcu stalls */
@@ -399,11 +400,25 @@ static void unregister_sha256_ni(void)
 static inline void unregister_sha256_ni(void) { }
 #endif
 
+static const struct x86_cpu_id module_cpu_ids[] = {
+#ifdef CONFIG_AS_SHA256_NI
+	X86_MATCH_FEATURE(X86_FEATURE_SHA_NI, NULL),
+#endif
+	X86_MATCH_FEATURE(X86_FEATURE_AVX2, NULL),
+	X86_MATCH_FEATURE(X86_FEATURE_AVX, NULL),
+	X86_MATCH_FEATURE(X86_FEATURE_SSSE3, NULL),
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, module_cpu_ids);
+
 static int __init sha256_ssse3_mod_init(void)
 {
 	const char *feature_name;
 	int ret;
 
+	if (!x86_match_cpu(module_cpu_ids))
+		return -ENODEV;
+
 #ifdef CONFIG_AS_SHA256_NI
 	/* SHA-NI */
 	if (boot_cpu_has(X86_FEATURE_SHA_NI)) {
-- 
2.38.1