Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 539 insertions, 0 deletions

diff --git a/drivers/crypto/padlock-aes.c b/drivers/crypto/padlock-aes.c
new file mode 100644
index 000000000..1be549a07
--- /dev/null
+++ b/drivers/crypto/padlock-aes.c
@@ -0,0 +1,539 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/* 
+ * Cryptographic API.
+ *
+ * Support for VIA PadLock hardware crypto engine.
+ *
+ * Copyright (c) 2004  Michal Ludvig <michal@logix.cz>
+ *
+ */
+
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+#include <crypto/internal/skcipher.h>
+#include <crypto/padlock.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/percpu.h>
+#include <linux/smp.h>
+#include <linux/slab.h>
+#include <asm/cpu_device_id.h>
+#include <asm/byteorder.h>
+#include <asm/processor.h>
+#include <asm/fpu/api.h>
+
+/*
+ * Number of data blocks actually fetched for each xcrypt insn.
+ * Processors with prefetch errata will fetch extra blocks.
+ */
+static unsigned int ecb_fetch_blocks = 2;
+#define MAX_ECB_FETCH_BLOCKS (8)
+#define ecb_fetch_bytes (ecb_fetch_blocks * AES_BLOCK_SIZE)
+
+static unsigned int cbc_fetch_blocks = 1;
+#define MAX_CBC_FETCH_BLOCKS (4)
+#define cbc_fetch_bytes (cbc_fetch_blocks * AES_BLOCK_SIZE)
+
+/* Control word. */
+struct cword {
+	unsigned int __attribute__ ((__packed__))
+		rounds:4,
+		algo:3,
+		keygen:1,
+		interm:1,
+		encdec:1,
+		ksize:2;
+} __attribute__ ((__aligned__(PADLOCK_ALIGNMENT)));
+
+/* Whenever making any changes to the following
+ * structure *make sure* you keep E, d_data
+ * and cword aligned on 16 Bytes boundaries and
+ * the Hardware can access 16 * 16 bytes of E and d_data
+ * (only the first 15 * 16 bytes matter but the HW reads
+ * more).
+ */
+struct aes_ctx {
+	u32 E[AES_MAX_KEYLENGTH_U32]
+		__attribute__ ((__aligned__(PADLOCK_ALIGNMENT)));
+	u32 d_data[AES_MAX_KEYLENGTH_U32]
+		__attribute__ ((__aligned__(PADLOCK_ALIGNMENT)));
+	struct {
+		struct cword encrypt;
+		struct cword decrypt;
+	} cword;
+	u32 *D;
+};
+
+static DEFINE_PER_CPU(struct cword *, paes_last_cword);
+
+/* Tells whether the ACE is capable to generate
+   the extended key for a given key_len. */
+static inline int
+aes_hw_extkey_available(uint8_t key_len)
+{
+	/* TODO: We should check the actual CPU model/stepping
+	         as it's possible that the capability will be
+	         added in the next CPU revisions. */
+	if (key_len == 16)
+		return 1;
+	return 0;
+}
+
+static inline struct aes_ctx *aes_ctx_common(void *ctx)
+{
+	unsigned long addr = (unsigned long)ctx;
+	unsigned long align = PADLOCK_ALIGNMENT;
+
+	if (align <= crypto_tfm_ctx_alignment())
+		align = 1;
+	return (struct aes_ctx *)ALIGN(addr, align);
+}
+
+static inline struct aes_ctx *aes_ctx(struct crypto_tfm *tfm)
+{
+	return aes_ctx_common(crypto_tfm_ctx(tfm));
+}
+
+static inline struct aes_ctx *skcipher_aes_ctx(struct crypto_skcipher *tfm)
+{
+	return aes_ctx_common(crypto_skcipher_ctx(tfm));
+}
+
+static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
+		       unsigned int key_len)
+{
+	struct aes_ctx *ctx = aes_ctx(tfm);
+	const __le32 *key = (const __le32 *)in_key;
+	struct crypto_aes_ctx gen_aes;
+	int cpu;
+
+	if (key_len % 8)
+		return -EINVAL;
+
+	/*
+	 * If the hardware is capable of generating the extended key
+	 * itself we must supply the plain key for both encryption
+	 * and decryption.
+	 */
+	ctx->D = ctx->E;
+
+	ctx->E[0] = le32_to_cpu(key[0]);
+	ctx->E[1] = le32_to_cpu(key[1]);
+	ctx->E[2] = le32_to_cpu(key[2]);
+	ctx->E[3] = le32_to_cpu(key[3]);
+
+	/* Prepare control words. */
+	memset(&ctx->cword, 0, sizeof(ctx->cword));
+
+	ctx->cword.decrypt.encdec = 1;
+	ctx->cword.encrypt.rounds = 10 + (key_len - 16) / 4;
+	ctx->cword.decrypt.rounds = ctx->cword.encrypt.rounds;
+	ctx->cword.encrypt.ksize = (key_len - 16) / 8;
+	ctx->cword.decrypt.ksize = ctx->cword.encrypt.ksize;
+
+	/* Don't generate extended keys if the hardware can do it. */
+	if (aes_hw_extkey_available(key_len))
+		goto ok;
+
+	ctx->D = ctx->d_data;
+	ctx->cword.encrypt.keygen = 1;
+	ctx->cword.decrypt.keygen = 1;
+
+	if (aes_expandkey(&gen_aes, in_key, key_len))
+		return -EINVAL;
+
+	memcpy(ctx->E, gen_aes.key_enc, AES_MAX_KEYLENGTH);
+	memcpy(ctx->D, gen_aes.key_dec, AES_MAX_KEYLENGTH);
+
+ok:
+	for_each_online_cpu(cpu)
+		if (&ctx->cword.encrypt == per_cpu(paes_last_cword, cpu) ||
+		    &ctx->cword.decrypt == per_cpu(paes_last_cword, cpu))
+			per_cpu(paes_last_cword, cpu) = NULL;
+
+	return 0;
+}
+
+static int aes_set_key_skcipher(struct crypto_skcipher *tfm, const u8 *in_key,
+				unsigned int key_len)
+{
+	return aes_set_key(crypto_skcipher_tfm(tfm), in_key, key_len);
+}
+
+/* ====== Encryption/decryption routines ====== */
+
+/* These are the real call to PadLock. */
+static inline void padlock_reset_key(struct cword *cword)
+{
+	int cpu = raw_smp_processor_id();
+
+	if (cword != per_cpu(paes_last_cword, cpu))
+#ifndef CONFIG_X86_64
+		asm volatile ("pushfl; popfl");
+#else
+		asm volatile ("pushfq; popfq");
+#endif
+}
+
+static inline void padlock_store_cword(struct cword *cword)
+{
+	per_cpu(paes_last_cword, raw_smp_processor_id()) = cword;
+}
+
+/*
+ * While the padlock instructions don't use FP/SSE registers, they
+ * generate a spurious DNA fault when CR0.TS is '1'.  Fortunately,
+ * the kernel doesn't use CR0.TS.
+ */
+
+static inline void rep_xcrypt_ecb(const u8 *input, u8 *output, void *key,
+				  struct cword *control_word, int count)
+{
+	asm volatile (".byte 0xf3,0x0f,0xa7,0xc8"	/* rep xcryptecb */
+		      : "+S"(input), "+D"(output)
+		      : "d"(control_word), "b"(key), "c"(count));
+}
+
+static inline u8 *rep_xcrypt_cbc(const u8 *input, u8 *output, void *key,
+				 u8 *iv, struct cword *control_word, int count)
+{
+	asm volatile (".byte 0xf3,0x0f,0xa7,0xd0"	/* rep xcryptcbc */
+		      : "+S" (input), "+D" (output), "+a" (iv)
+		      : "d" (control_word), "b" (key), "c" (count));
+	return iv;
+}
+
+static void ecb_crypt_copy(const u8 *in, u8 *out, u32 *key,
+			   struct cword *cword, int count)
+{
+	/*
+	 * Padlock prefetches extra data so we must provide mapped input buffers.
+	 * Assume there are at least 16 bytes of stack already in use.
+	 */
+	u8 buf[AES_BLOCK_SIZE * (MAX_ECB_FETCH_BLOCKS - 1) + PADLOCK_ALIGNMENT - 1];
+	u8 *tmp = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
+
+	memcpy(tmp, in, count * AES_BLOCK_SIZE);
+	rep_xcrypt_ecb(tmp, out, key, cword, count);
+}
+
+static u8 *cbc_crypt_copy(const u8 *in, u8 *out, u32 *key,
+			   u8 *iv, struct cword *cword, int count)
+{
+	/*
+	 * Padlock prefetches extra data so we must provide mapped input buffers.
+	 * Assume there are at least 16 bytes of stack already in use.
+	 */
+	u8 buf[AES_BLOCK_SIZE * (MAX_CBC_FETCH_BLOCKS - 1) + PADLOCK_ALIGNMENT - 1];
+	u8 *tmp = PTR_ALIGN(&buf[0], PADLOCK_ALIGNMENT);
+
+	memcpy(tmp, in, count * AES_BLOCK_SIZE);
+	return rep_xcrypt_cbc(tmp, out, key, iv, cword, count);
+}
+
+static inline void ecb_crypt(const u8 *in, u8 *out, u32 *key,
+			     struct cword *cword, int count)
+{
+	/* Padlock in ECB mode fetches at least ecb_fetch_bytes of data.
+	 * We could avoid some copying here but it's probably not worth it.
+	 */
+	if (unlikely(offset_in_page(in) + ecb_fetch_bytes > PAGE_SIZE)) {
+		ecb_crypt_copy(in, out, key, cword, count);
+		return;
+	}
+
+	rep_xcrypt_ecb(in, out, key, cword, count);
+}
+
+static inline u8 *cbc_crypt(const u8 *in, u8 *out, u32 *key,
+			    u8 *iv, struct cword *cword, int count)
+{
+	/* Padlock in CBC mode fetches at least cbc_fetch_bytes of data. */
+	if (unlikely(offset_in_page(in) + cbc_fetch_bytes > PAGE_SIZE))
+		return cbc_crypt_copy(in, out, key, iv, cword, count);
+
+	return rep_xcrypt_cbc(in, out, key, iv, cword, count);
+}
+
+static inline void padlock_xcrypt_ecb(const u8 *input, u8 *output, void *key,
+				      void *control_word, u32 count)
+{
+	u32 initial = count & (ecb_fetch_blocks - 1);
+
+	if (count < ecb_fetch_blocks) {
+		ecb_crypt(input, output, key, control_word, count);
+		return;
+	}
+
+	count -= initial;
+
+	if (initial)
+		asm volatile (".byte 0xf3,0x0f,0xa7,0xc8"	/* rep xcryptecb */
+			      : "+S"(input), "+D"(output)
+			      : "d"(control_word), "b"(key), "c"(initial));
+
+	asm volatile (".byte 0xf3,0x0f,0xa7,0xc8"	/* rep xcryptecb */
+		      : "+S"(input), "+D"(output)
+		      : "d"(control_word), "b"(key), "c"(count));
+}
+
+static inline u8 *padlock_xcrypt_cbc(const u8 *input, u8 *output, void *key,
+				     u8 *iv, void *control_word, u32 count)
+{
+	u32 initial = count & (cbc_fetch_blocks - 1);
+
+	if (count < cbc_fetch_blocks)
+		return cbc_crypt(input, output, key, iv, control_word, count);
+
+	count -= initial;
+
+	if (initial)
+		asm volatile (".byte 0xf3,0x0f,0xa7,0xd0"	/* rep xcryptcbc */
+			      : "+S" (input), "+D" (output), "+a" (iv)
+			      : "d" (control_word), "b" (key), "c" (initial));
+
+	asm volatile (".byte 0xf3,0x0f,0xa7,0xd0"	/* rep xcryptcbc */
+		      : "+S" (input), "+D" (output), "+a" (iv)
+		      : "d" (control_word), "b" (key), "c" (count));
+	return iv;
+}
+
+static void padlock_aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+{
+	struct aes_ctx *ctx = aes_ctx(tfm);
+
+	padlock_reset_key(&ctx->cword.encrypt);
+	ecb_crypt(in, out, ctx->E, &ctx->cword.encrypt, 1);
+	padlock_store_cword(&ctx->cword.encrypt);
+}
+
+static void padlock_aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
+{
+	struct aes_ctx *ctx = aes_ctx(tfm);
+
+	padlock_reset_key(&ctx->cword.encrypt);
+	ecb_crypt(in, out, ctx->D, &ctx->cword.decrypt, 1);
+	padlock_store_cword(&ctx->cword.encrypt);
+}
+
+static struct crypto_alg aes_alg = {
+	.cra_name		=	"aes",
+	.cra_driver_name	=	"aes-padlock",
+	.cra_priority		=	PADLOCK_CRA_PRIORITY,
+	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
+	.cra_blocksize		=	AES_BLOCK_SIZE,
+	.cra_ctxsize		=	sizeof(struct aes_ctx),
+	.cra_alignmask		=	PADLOCK_ALIGNMENT - 1,
+	.cra_module		=	THIS_MODULE,
+	.cra_u			=	{
+		.cipher = {
+			.cia_min_keysize	=	AES_MIN_KEY_SIZE,
+			.cia_max_keysize	=	AES_MAX_KEY_SIZE,
+			.cia_setkey	   	= 	aes_set_key,
+			.cia_encrypt	 	=	padlock_aes_encrypt,
+			.cia_decrypt	  	=	padlock_aes_decrypt,
+		}
+	}
+};
+
+static int ecb_aes_encrypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct aes_ctx *ctx = skcipher_aes_ctx(tfm);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
+
+	padlock_reset_key(&ctx->cword.encrypt);
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes) != 0) {
+		padlock_xcrypt_ecb(walk.src.virt.addr, walk.dst.virt.addr,
+				   ctx->E, &ctx->cword.encrypt,
+				   nbytes / AES_BLOCK_SIZE);
+		nbytes &= AES_BLOCK_SIZE - 1;
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	padlock_store_cword(&ctx->cword.encrypt);
+
+	return err;
+}
+
+static int ecb_aes_decrypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct aes_ctx *ctx = skcipher_aes_ctx(tfm);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
+
+	padlock_reset_key(&ctx->cword.decrypt);
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes) != 0) {
+		padlock_xcrypt_ecb(walk.src.virt.addr, walk.dst.virt.addr,
+				   ctx->D, &ctx->cword.decrypt,
+				   nbytes / AES_BLOCK_SIZE);
+		nbytes &= AES_BLOCK_SIZE - 1;
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	padlock_store_cword(&ctx->cword.encrypt);
+
+	return err;
+}
+
+static struct skcipher_alg ecb_aes_alg = {
+	.base.cra_name		=	"ecb(aes)",
+	.base.cra_driver_name	=	"ecb-aes-padlock",
+	.base.cra_priority	=	PADLOCK_COMPOSITE_PRIORITY,
+	.base.cra_blocksize	=	AES_BLOCK_SIZE,
+	.base.cra_ctxsize	=	sizeof(struct aes_ctx),
+	.base.cra_alignmask	=	PADLOCK_ALIGNMENT - 1,
+	.base.cra_module	=	THIS_MODULE,
+	.min_keysize		=	AES_MIN_KEY_SIZE,
+	.max_keysize		=	AES_MAX_KEY_SIZE,
+	.setkey			=	aes_set_key_skcipher,
+	.encrypt		=	ecb_aes_encrypt,
+	.decrypt		=	ecb_aes_decrypt,
+};
+
+static int cbc_aes_encrypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct aes_ctx *ctx = skcipher_aes_ctx(tfm);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
+
+	padlock_reset_key(&ctx->cword.encrypt);
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes) != 0) {
+		u8 *iv = padlock_xcrypt_cbc(walk.src.virt.addr,
+					    walk.dst.virt.addr, ctx->E,
+					    walk.iv, &ctx->cword.encrypt,
+					    nbytes / AES_BLOCK_SIZE);
+		memcpy(walk.iv, iv, AES_BLOCK_SIZE);
+		nbytes &= AES_BLOCK_SIZE - 1;
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	padlock_store_cword(&ctx->cword.decrypt);
+
+	return err;
+}
+
+static int cbc_aes_decrypt(struct skcipher_request *req)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct aes_ctx *ctx = skcipher_aes_ctx(tfm);
+	struct skcipher_walk walk;
+	unsigned int nbytes;
+	int err;
+
+	padlock_reset_key(&ctx->cword.encrypt);
+
+	err = skcipher_walk_virt(&walk, req, false);
+
+	while ((nbytes = walk.nbytes) != 0) {
+		padlock_xcrypt_cbc(walk.src.virt.addr, walk.dst.virt.addr,
+				   ctx->D, walk.iv, &ctx->cword.decrypt,
+				   nbytes / AES_BLOCK_SIZE);
+		nbytes &= AES_BLOCK_SIZE - 1;
+		err = skcipher_walk_done(&walk, nbytes);
+	}
+
+	padlock_store_cword(&ctx->cword.encrypt);
+
+	return err;
+}
+
+static struct skcipher_alg cbc_aes_alg = {
+	.base.cra_name		=	"cbc(aes)",
+	.base.cra_driver_name	=	"cbc-aes-padlock",
+	.base.cra_priority	=	PADLOCK_COMPOSITE_PRIORITY,
+	.base.cra_blocksize	=	AES_BLOCK_SIZE,
+	.base.cra_ctxsize	=	sizeof(struct aes_ctx),
+	.base.cra_alignmask	=	PADLOCK_ALIGNMENT - 1,
+	.base.cra_module	=	THIS_MODULE,
+	.min_keysize		=	AES_MIN_KEY_SIZE,
+	.max_keysize		=	AES_MAX_KEY_SIZE,
+	.ivsize			=	AES_BLOCK_SIZE,
+	.setkey			=	aes_set_key_skcipher,
+	.encrypt		=	cbc_aes_encrypt,
+	.decrypt		=	cbc_aes_decrypt,
+};
+
+static const struct x86_cpu_id padlock_cpu_id[] = {
+	X86_MATCH_FEATURE(X86_FEATURE_XCRYPT, NULL),
+	{}
+};
+MODULE_DEVICE_TABLE(x86cpu, padlock_cpu_id);
+
+static int __init padlock_init(void)
+{
+	int ret;
+	struct cpuinfo_x86 *c = &cpu_data(0);
+
+	if (!x86_match_cpu(padlock_cpu_id))
+		return -ENODEV;
+
+	if (!boot_cpu_has(X86_FEATURE_XCRYPT_EN)) {
+		printk(KERN_NOTICE PFX "VIA PadLock detected, but not enabled. Hmm, strange...\n");
+		return -ENODEV;
+	}
+
+	if ((ret = crypto_register_alg(&aes_alg)) != 0)
+		goto aes_err;
+
+	if ((ret = crypto_register_skcipher(&ecb_aes_alg)) != 0)
+		goto ecb_aes_err;
+
+	if ((ret = crypto_register_skcipher(&cbc_aes_alg)) != 0)
+		goto cbc_aes_err;
+
+	printk(KERN_NOTICE PFX "Using VIA PadLock ACE for AES algorithm.\n");
+
+	if (c->x86 == 6 && c->x86_model == 15 && c->x86_stepping == 2) {
+		ecb_fetch_blocks = MAX_ECB_FETCH_BLOCKS;
+		cbc_fetch_blocks = MAX_CBC_FETCH_BLOCKS;
+		printk(KERN_NOTICE PFX "VIA Nano stepping 2 detected: enabling workaround.\n");
+	}
+
+out:
+	return ret;
+
+cbc_aes_err:
+	crypto_unregister_skcipher(&ecb_aes_alg);
+ecb_aes_err:
+	crypto_unregister_alg(&aes_alg);
+aes_err:
+	printk(KERN_ERR PFX "VIA PadLock AES initialization failed.\n");
+	goto out;
+}
+
+static void __exit padlock_fini(void)
+{
+	crypto_unregister_skcipher(&cbc_aes_alg);
+	crypto_unregister_skcipher(&ecb_aes_alg);
+	crypto_unregister_alg(&aes_alg);
+}
+
+module_init(padlock_init);
+module_exit(padlock_fini);
+
+MODULE_DESCRIPTION("VIA PadLock AES algorithm support");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Michal Ludvig");
+
+MODULE_ALIAS_CRYPTO("aes");