From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/crypto/geode-aes.c | 456 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 456 insertions(+) create mode 100644 drivers/crypto/geode-aes.c (limited to 'drivers/crypto/geode-aes.c') diff --git a/drivers/crypto/geode-aes.c b/drivers/crypto/geode-aes.c new file mode 100644 index 000000000..0bd99c0de --- /dev/null +++ b/drivers/crypto/geode-aes.c @@ -0,0 +1,456 @@ + /* Copyright (C) 2004-2006, Advanced Micro Devices, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#include "geode-aes.h" + +/* Static structures */ + +static void __iomem *_iobase; +static spinlock_t lock; + +/* Write a 128 bit field (either a writable key or IV) */ +static inline void +_writefield(u32 offset, const void *value) +{ + int i; + + for (i = 0; i < 4; i++) + iowrite32(((const u32 *) value)[i], _iobase + offset + (i * 4)); +} + +/* Read a 128 bit field (either a writable key or IV) */ +static inline void +_readfield(u32 offset, void *value) +{ + int i; + + for (i = 0; i < 4; i++) + ((u32 *) value)[i] = ioread32(_iobase + offset + (i * 4)); +} + +static int +do_crypt(const void *src, void *dst, u32 len, u32 flags) +{ + u32 status; + u32 counter = AES_OP_TIMEOUT; + + iowrite32(virt_to_phys((void *)src), _iobase + AES_SOURCEA_REG); + iowrite32(virt_to_phys(dst), _iobase + AES_DSTA_REG); + iowrite32(len, _iobase + AES_LENA_REG); + + /* Start the operation */ + iowrite32(AES_CTRL_START | flags, _iobase + AES_CTRLA_REG); + + do { + status = ioread32(_iobase + AES_INTR_REG); + cpu_relax(); + } while (!(status & AES_INTRA_PENDING) && --counter); + + /* Clear the event */ + iowrite32((status & 0xFF) | AES_INTRA_PENDING, _iobase + AES_INTR_REG); + return counter ? 0 : 1; +} + +static void +geode_aes_crypt(const struct geode_aes_tfm_ctx *tctx, const void *src, + void *dst, u32 len, u8 *iv, int mode, int dir) +{ + u32 flags = 0; + unsigned long iflags; + int ret; + + /* If the source and destination is the same, then + * we need to turn on the coherent flags, otherwise + * we don't need to worry + */ + + flags |= (AES_CTRL_DCA | AES_CTRL_SCA); + + if (dir == AES_DIR_ENCRYPT) + flags |= AES_CTRL_ENCRYPT; + + /* Start the critical section */ + + spin_lock_irqsave(&lock, iflags); + + if (mode == AES_MODE_CBC) { + flags |= AES_CTRL_CBC; + _writefield(AES_WRITEIV0_REG, iv); + } + + flags |= AES_CTRL_WRKEY; + _writefield(AES_WRITEKEY0_REG, tctx->key); + + ret = do_crypt(src, dst, len, flags); + BUG_ON(ret); + + if (mode == AES_MODE_CBC) + _readfield(AES_WRITEIV0_REG, iv); + + spin_unlock_irqrestore(&lock, iflags); +} + +/* CRYPTO-API Functions */ + +static int geode_setkey_cip(struct crypto_tfm *tfm, const u8 *key, + unsigned int len) +{ + struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); + unsigned int ret; + + tctx->keylen = len; + + if (len == AES_KEYSIZE_128) { + memcpy(tctx->key, key, len); + return 0; + } + + if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) { + /* not supported at all */ + tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; + return -EINVAL; + } + + /* + * The requested key size is not supported by HW, do a fallback + */ + tctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK; + tctx->fallback.cip->base.crt_flags |= + (tfm->crt_flags & CRYPTO_TFM_REQ_MASK); + + ret = crypto_cipher_setkey(tctx->fallback.cip, key, len); + if (ret) { + tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK; + tfm->crt_flags |= (tctx->fallback.cip->base.crt_flags & + CRYPTO_TFM_RES_MASK); + } + return ret; +} + +static int geode_setkey_skcipher(struct crypto_skcipher *tfm, const u8 *key, + unsigned int len) +{ + struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); + unsigned int ret; + + tctx->keylen = len; + + if (len == AES_KEYSIZE_128) { + memcpy(tctx->key, key, len); + return 0; + } + + if (len != AES_KEYSIZE_192 && len != AES_KEYSIZE_256) { + /* not supported at all */ + crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN); + return -EINVAL; + } + + /* + * The requested key size is not supported by HW, do a fallback + */ + crypto_skcipher_clear_flags(tctx->fallback.skcipher, + CRYPTO_TFM_REQ_MASK); + crypto_skcipher_set_flags(tctx->fallback.skcipher, + crypto_skcipher_get_flags(tfm) & + CRYPTO_TFM_REQ_MASK); + ret = crypto_skcipher_setkey(tctx->fallback.skcipher, key, len); + crypto_skcipher_set_flags(tfm, + crypto_skcipher_get_flags(tctx->fallback.skcipher) & + CRYPTO_TFM_RES_MASK); + return ret; +} + +static void +geode_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) +{ + const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); + + if (unlikely(tctx->keylen != AES_KEYSIZE_128)) { + crypto_cipher_encrypt_one(tctx->fallback.cip, out, in); + return; + } + + geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL, + AES_MODE_ECB, AES_DIR_ENCRYPT); +} + + +static void +geode_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in) +{ + const struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); + + if (unlikely(tctx->keylen != AES_KEYSIZE_128)) { + crypto_cipher_decrypt_one(tctx->fallback.cip, out, in); + return; + } + + geode_aes_crypt(tctx, in, out, AES_BLOCK_SIZE, NULL, + AES_MODE_ECB, AES_DIR_DECRYPT); +} + +static int fallback_init_cip(struct crypto_tfm *tfm) +{ + const char *name = crypto_tfm_alg_name(tfm); + struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); + + tctx->fallback.cip = crypto_alloc_cipher(name, 0, + CRYPTO_ALG_NEED_FALLBACK); + + if (IS_ERR(tctx->fallback.cip)) { + printk(KERN_ERR "Error allocating fallback algo %s\n", name); + return PTR_ERR(tctx->fallback.cip); + } + + return 0; +} + +static void fallback_exit_cip(struct crypto_tfm *tfm) +{ + struct geode_aes_tfm_ctx *tctx = crypto_tfm_ctx(tfm); + + crypto_free_cipher(tctx->fallback.cip); +} + +static struct crypto_alg geode_alg = { + .cra_name = "aes", + .cra_driver_name = "geode-aes", + .cra_priority = 300, + .cra_alignmask = 15, + .cra_flags = CRYPTO_ALG_TYPE_CIPHER | + CRYPTO_ALG_NEED_FALLBACK, + .cra_init = fallback_init_cip, + .cra_exit = fallback_exit_cip, + .cra_blocksize = AES_BLOCK_SIZE, + .cra_ctxsize = sizeof(struct geode_aes_tfm_ctx), + .cra_module = THIS_MODULE, + .cra_u = { + .cipher = { + .cia_min_keysize = AES_MIN_KEY_SIZE, + .cia_max_keysize = AES_MAX_KEY_SIZE, + .cia_setkey = geode_setkey_cip, + .cia_encrypt = geode_encrypt, + .cia_decrypt = geode_decrypt + } + } +}; + +static int geode_init_skcipher(struct crypto_skcipher *tfm) +{ + const char *name = crypto_tfm_alg_name(&tfm->base); + struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); + + tctx->fallback.skcipher = + crypto_alloc_skcipher(name, 0, CRYPTO_ALG_NEED_FALLBACK | + CRYPTO_ALG_ASYNC); + if (IS_ERR(tctx->fallback.skcipher)) { + printk(KERN_ERR "Error allocating fallback algo %s\n", name); + return PTR_ERR(tctx->fallback.skcipher); + } + + crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) + + crypto_skcipher_reqsize(tctx->fallback.skcipher)); + return 0; +} + +static void geode_exit_skcipher(struct crypto_skcipher *tfm) +{ + struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); + + crypto_free_skcipher(tctx->fallback.skcipher); +} + +static int geode_skcipher_crypt(struct skcipher_request *req, int mode, int dir) +{ + struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req); + const struct geode_aes_tfm_ctx *tctx = crypto_skcipher_ctx(tfm); + struct skcipher_walk walk; + unsigned int nbytes; + int err; + + if (unlikely(tctx->keylen != AES_KEYSIZE_128)) { + struct skcipher_request *subreq = skcipher_request_ctx(req); + + *subreq = *req; + skcipher_request_set_tfm(subreq, tctx->fallback.skcipher); + if (dir == AES_DIR_DECRYPT) + return crypto_skcipher_decrypt(subreq); + else + return crypto_skcipher_encrypt(subreq); + } + + err = skcipher_walk_virt(&walk, req, false); + + while ((nbytes = walk.nbytes) != 0) { + geode_aes_crypt(tctx, walk.src.virt.addr, walk.dst.virt.addr, + round_down(nbytes, AES_BLOCK_SIZE), + walk.iv, mode, dir); + err = skcipher_walk_done(&walk, nbytes % AES_BLOCK_SIZE); + } + + return err; +} + +static int geode_cbc_encrypt(struct skcipher_request *req) +{ + return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_ENCRYPT); +} + +static int geode_cbc_decrypt(struct skcipher_request *req) +{ + return geode_skcipher_crypt(req, AES_MODE_CBC, AES_DIR_DECRYPT); +} + +static int geode_ecb_encrypt(struct skcipher_request *req) +{ + return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_ENCRYPT); +} + +static int geode_ecb_decrypt(struct skcipher_request *req) +{ + return geode_skcipher_crypt(req, AES_MODE_ECB, AES_DIR_DECRYPT); +} + +static struct skcipher_alg geode_skcipher_algs[] = { + { + .base.cra_name = "cbc(aes)", + .base.cra_driver_name = "cbc-aes-geode", + .base.cra_priority = 400, + .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY | + CRYPTO_ALG_NEED_FALLBACK, + .base.cra_blocksize = AES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx), + .base.cra_alignmask = 15, + .base.cra_module = THIS_MODULE, + .init = geode_init_skcipher, + .exit = geode_exit_skcipher, + .setkey = geode_setkey_skcipher, + .encrypt = geode_cbc_encrypt, + .decrypt = geode_cbc_decrypt, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + .ivsize = AES_BLOCK_SIZE, + }, { + .base.cra_name = "ecb(aes)", + .base.cra_driver_name = "ecb-aes-geode", + .base.cra_priority = 400, + .base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY | + CRYPTO_ALG_NEED_FALLBACK, + .base.cra_blocksize = AES_BLOCK_SIZE, + .base.cra_ctxsize = sizeof(struct geode_aes_tfm_ctx), + .base.cra_alignmask = 15, + .base.cra_module = THIS_MODULE, + .init = geode_init_skcipher, + .exit = geode_exit_skcipher, + .setkey = geode_setkey_skcipher, + .encrypt = geode_ecb_encrypt, + .decrypt = geode_ecb_decrypt, + .min_keysize = AES_MIN_KEY_SIZE, + .max_keysize = AES_MAX_KEY_SIZE, + }, +}; + +static void geode_aes_remove(struct pci_dev *dev) +{ + crypto_unregister_alg(&geode_alg); + crypto_unregister_skciphers(geode_skcipher_algs, + ARRAY_SIZE(geode_skcipher_algs)); + + pci_iounmap(dev, _iobase); + _iobase = NULL; + + pci_release_regions(dev); + pci_disable_device(dev); +} + + +static int geode_aes_probe(struct pci_dev *dev, const struct pci_device_id *id) +{ + int ret; + + ret = pci_enable_device(dev); + if (ret) + return ret; + + ret = pci_request_regions(dev, "geode-aes"); + if (ret) + goto eenable; + + _iobase = pci_iomap(dev, 0, 0); + + if (_iobase == NULL) { + ret = -ENOMEM; + goto erequest; + } + + spin_lock_init(&lock); + + /* Clear any pending activity */ + iowrite32(AES_INTR_PENDING | AES_INTR_MASK, _iobase + AES_INTR_REG); + + ret = crypto_register_alg(&geode_alg); + if (ret) + goto eiomap; + + ret = crypto_register_skciphers(geode_skcipher_algs, + ARRAY_SIZE(geode_skcipher_algs)); + if (ret) + goto ealg; + + dev_notice(&dev->dev, "GEODE AES engine enabled.\n"); + return 0; + + ealg: + crypto_unregister_alg(&geode_alg); + + eiomap: + pci_iounmap(dev, _iobase); + + erequest: + pci_release_regions(dev); + + eenable: + pci_disable_device(dev); + + dev_err(&dev->dev, "GEODE AES initialization failed.\n"); + return ret; +} + +static struct pci_device_id geode_aes_tbl[] = { + { PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_LX_AES), }, + { 0, } +}; + +MODULE_DEVICE_TABLE(pci, geode_aes_tbl); + +static struct pci_driver geode_aes_driver = { + .name = "Geode LX AES", + .id_table = geode_aes_tbl, + .probe = geode_aes_probe, + .remove = geode_aes_remove, +}; + +module_pci_driver(geode_aes_driver); + +MODULE_AUTHOR("Advanced Micro Devices, Inc."); +MODULE_DESCRIPTION("Geode LX Hardware AES driver"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3