diff options
Diffstat (limited to 'drivers/crypto/bcm/util.c')
| -rw-r--r-- | drivers/crypto/bcm/util.c | 581 |
1 files changed, 581 insertions, 0 deletions
diff --git a/drivers/crypto/bcm/util.c b/drivers/crypto/bcm/util.c new file mode 100644 index 000000000000..0502f460dacd --- /dev/null +++ b/drivers/crypto/bcm/util.c @@ -0,0 +1,581 @@ +/* + * Copyright 2016 Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation (the "GPL"). + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License version 2 (GPLv2) for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 (GPLv2) along with this source code. + */ + +#include <linux/debugfs.h> + +#include "cipher.h" +#include "util.h" + +/* offset of SPU_OFIFO_CTRL register */ +#define SPU_OFIFO_CTRL 0x40 +#define SPU_FIFO_WATERMARK 0x1FF + +/** + * spu_sg_at_offset() - Find the scatterlist entry at a given distance from the + * start of a scatterlist. + * @sg: [in] Start of a scatterlist + * @skip: [in] Distance from the start of the scatterlist, in bytes + * @sge: [out] Scatterlist entry at skip bytes from start + * @sge_offset: [out] Number of bytes from start of sge buffer to get to + * requested distance. + * + * Return: 0 if entry found at requested distance + * < 0 otherwise + */ +int spu_sg_at_offset(struct scatterlist *sg, unsigned int skip, + struct scatterlist **sge, unsigned int *sge_offset) +{ + /* byte index from start of sg to the end of the previous entry */ + unsigned int index = 0; + /* byte index from start of sg to the end of the current entry */ + unsigned int next_index; + + next_index = sg->length; + while (next_index <= skip) { + sg = sg_next(sg); + index = next_index; + if (!sg) + return -EINVAL; + next_index += sg->length; + } + + *sge_offset = skip - index; + *sge = sg; + return 0; +} + +/* Copy len bytes of sg data, starting at offset skip, to a dest buffer */ +void sg_copy_part_to_buf(struct scatterlist *src, u8 *dest, + unsigned int len, unsigned int skip) +{ + size_t copied; + unsigned int nents = sg_nents(src); + + copied = sg_pcopy_to_buffer(src, nents, dest, len, skip); + if (copied != len) { + flow_log("%s copied %u bytes of %u requested. ", + __func__, (u32)copied, len); + flow_log("sg with %u entries and skip %u\n", nents, skip); + } +} + +/* + * Copy data into a scatterlist starting at a specified offset in the + * scatterlist. Specifically, copy len bytes of data in the buffer src + * into the scatterlist dest, starting skip bytes into the scatterlist. + */ +void sg_copy_part_from_buf(struct scatterlist *dest, u8 *src, + unsigned int len, unsigned int skip) +{ + size_t copied; + unsigned int nents = sg_nents(dest); + + copied = sg_pcopy_from_buffer(dest, nents, src, len, skip); + if (copied != len) { + flow_log("%s copied %u bytes of %u requested. ", + __func__, (u32)copied, len); + flow_log("sg with %u entries and skip %u\n", nents, skip); + } +} + +/** + * spu_sg_count() - Determine number of elements in scatterlist to provide a + * specified number of bytes. + * @sg_list: scatterlist to examine + * @skip: index of starting point + * @nbytes: consider elements of scatterlist until reaching this number of + * bytes + * + * Return: the number of sg entries contributing to nbytes of data + */ +int spu_sg_count(struct scatterlist *sg_list, unsigned int skip, int nbytes) +{ + struct scatterlist *sg; + int sg_nents = 0; + unsigned int offset; + + if (!sg_list) + return 0; + + if (spu_sg_at_offset(sg_list, skip, &sg, &offset) < 0) + return 0; + + while (sg && (nbytes > 0)) { + sg_nents++; + nbytes -= (sg->length - offset); + offset = 0; + sg = sg_next(sg); + } + return sg_nents; +} + +/** + * spu_msg_sg_add() - Copy scatterlist entries from one sg to another, up to a + * given length. + * @to_sg: scatterlist to copy to + * @from_sg: scatterlist to copy from + * @from_skip: number of bytes to skip in from_sg. Non-zero when previous + * request included part of the buffer in entry in from_sg. + * Assumes from_skip < from_sg->length. + * @from_nents number of entries in from_sg + * @length number of bytes to copy. may reach this limit before exhausting + * from_sg. + * + * Copies the entries themselves, not the data in the entries. Assumes to_sg has + * enough entries. Does not limit the size of an individual buffer in to_sg. + * + * to_sg, from_sg, skip are all updated to end of copy + * + * Return: Number of bytes copied + */ +u32 spu_msg_sg_add(struct scatterlist **to_sg, + struct scatterlist **from_sg, u32 *from_skip, + u8 from_nents, u32 length) +{ + struct scatterlist *sg; /* an entry in from_sg */ + struct scatterlist *to = *to_sg; + struct scatterlist *from = *from_sg; + u32 skip = *from_skip; + u32 offset; + int i; + u32 entry_len = 0; + u32 frag_len = 0; /* length of entry added to to_sg */ + u32 copied = 0; /* number of bytes copied so far */ + + if (length == 0) + return 0; + + for_each_sg(from, sg, from_nents, i) { + /* number of bytes in this from entry not yet used */ + entry_len = sg->length - skip; + frag_len = min(entry_len, length - copied); + offset = sg->offset + skip; + if (frag_len) + sg_set_page(to++, sg_page(sg), frag_len, offset); + copied += frag_len; + if (copied == entry_len) { + /* used up all of from entry */ + skip = 0; /* start at beginning of next entry */ + } + if (copied == length) + break; + } + *to_sg = to; + *from_sg = sg; + if (frag_len < entry_len) + *from_skip = skip + frag_len; + else + *from_skip = 0; + + return copied; +} + +void add_to_ctr(u8 *ctr_pos, unsigned int increment) +{ + __be64 *high_be = (__be64 *)ctr_pos; + __be64 *low_be = high_be + 1; + u64 orig_low = __be64_to_cpu(*low_be); + u64 new_low = orig_low + (u64)increment; + + *low_be = __cpu_to_be64(new_low); + if (new_low < orig_low) + /* there was a carry from the low 8 bytes */ + *high_be = __cpu_to_be64(__be64_to_cpu(*high_be) + 1); +} + +struct sdesc { + struct shash_desc shash; + char ctx[]; +}; + +/* do a synchronous decrypt operation */ +int do_decrypt(char *alg_name, + void *key_ptr, unsigned int key_len, + void *iv_ptr, void *src_ptr, void *dst_ptr, + unsigned int block_len) +{ + struct scatterlist sg_in[1], sg_out[1]; + struct crypto_blkcipher *tfm = + crypto_alloc_blkcipher(alg_name, 0, CRYPTO_ALG_ASYNC); + struct blkcipher_desc desc = {.tfm = tfm, .flags = 0 }; + int ret = 0; + void *iv; + int ivsize; + + flow_log("%s() name:%s block_len:%u\n", __func__, alg_name, block_len); + + if (IS_ERR(tfm)) + return PTR_ERR(tfm); + + crypto_blkcipher_setkey((void *)tfm, key_ptr, key_len); + + sg_init_table(sg_in, 1); + sg_set_buf(sg_in, src_ptr, block_len); + + sg_init_table(sg_out, 1); + sg_set_buf(sg_out, dst_ptr, block_len); + + iv = crypto_blkcipher_crt(tfm)->iv; + ivsize = crypto_blkcipher_ivsize(tfm); + memcpy(iv, iv_ptr, ivsize); + + ret = crypto_blkcipher_decrypt(&desc, sg_out, sg_in, block_len); + crypto_free_blkcipher(tfm); + + if (ret < 0) + pr_err("aes_decrypt failed %d\n", ret); + + return ret; +} + +/** + * do_shash() - Do a synchronous hash operation in software + * @name: The name of the hash algorithm + * @result: Buffer where digest is to be written + * @data1: First part of data to hash. May be NULL. + * @data1_len: Length of data1, in bytes + * @data2: Second part of data to hash. May be NULL. + * @data2_len: Length of data2, in bytes + * @key: Key (if keyed hash) + * @key_len: Length of key, in bytes (or 0 if non-keyed hash) + * + * Note that the crypto API will not select this driver's own transform because + * this driver only registers asynchronous algos. + * + * Return: 0 if hash successfully stored in result + * < 0 otherwise + */ +int do_shash(unsigned char *name, unsigned char *result, + const u8 *data1, unsigned int data1_len, + const u8 *data2, unsigned int data2_len, + const u8 *key, unsigned int key_len) +{ + int rc; + unsigned int size; + struct crypto_shash *hash; + struct sdesc *sdesc; + + hash = crypto_alloc_shash(name, 0, 0); + if (IS_ERR(hash)) { + rc = PTR_ERR(hash); + pr_err("%s: Crypto %s allocation error %d", __func__, name, rc); + return rc; + } + + size = sizeof(struct shash_desc) + crypto_shash_descsize(hash); + sdesc = kmalloc(size, GFP_KERNEL); + if (!sdesc) { + rc = -ENOMEM; + pr_err("%s: Memory allocation failure", __func__); + goto do_shash_err; + } + sdesc->shash.tfm = hash; + sdesc->shash.flags = 0x0; + + if (key_len > 0) { + rc = crypto_shash_setkey(hash, key, key_len); + if (rc) { + pr_err("%s: Could not setkey %s shash", __func__, name); + goto do_shash_err; + } + } + + rc = crypto_shash_init(&sdesc->shash); + if (rc) { + pr_err("%s: Could not init %s shash", __func__, name); + goto do_shash_err; + } + rc = crypto_shash_update(&sdesc->shash, data1, data1_len); + if (rc) { + pr_err("%s: Could not update1", __func__); + goto do_shash_err; + } + if (data2 && data2_len) { + rc = crypto_shash_update(&sdesc->shash, data2, data2_len); + if (rc) { + pr_err("%s: Could not update2", __func__); + goto do_shash_err; + } + } + rc = crypto_shash_final(&sdesc->shash, result); + if (rc) + pr_err("%s: Could not genereate %s hash", __func__, name); + +do_shash_err: + crypto_free_shash(hash); + kfree(sdesc); + + return rc; +} + +/* Dump len bytes of a scatterlist starting at skip bytes into the sg */ +void __dump_sg(struct scatterlist *sg, unsigned int skip, unsigned int len) +{ + u8 dbuf[16]; + unsigned int idx = skip; + unsigned int num_out = 0; /* number of bytes dumped so far */ + unsigned int count; + + if (packet_debug_logging) { + while (num_out < len) { + count = (len - num_out > 16) ? 16 : len - num_out; + sg_copy_part_to_buf(sg, dbuf, count, idx); + num_out += count; + print_hex_dump(KERN_ALERT, " sg: ", DUMP_PREFIX_NONE, + 4, 1, dbuf, count, false); + idx += 16; + } + } + if (debug_logging_sleep) + msleep(debug_logging_sleep); +} + +/* Returns the name for a given cipher alg/mode */ +char *spu_alg_name(enum spu_cipher_alg alg, enum spu_cipher_mode mode) +{ + switch (alg) { + case CIPHER_ALG_RC4: + return "rc4"; + case CIPHER_ALG_AES: + switch (mode) { + case CIPHER_MODE_CBC: + return "cbc(aes)"; + case CIPHER_MODE_ECB: + return "ecb(aes)"; + case CIPHER_MODE_OFB: + return "ofb(aes)"; + case CIPHER_MODE_CFB: + return "cfb(aes)"; + case CIPHER_MODE_CTR: + return "ctr(aes)"; + case CIPHER_MODE_XTS: + return "xts(aes)"; + case CIPHER_MODE_GCM: + return "gcm(aes)"; + default: + return "aes"; + } + break; + case CIPHER_ALG_DES: + switch (mode) { + case CIPHER_MODE_CBC: + return "cbc(des)"; + case CIPHER_MODE_ECB: + return "ecb(des)"; + case CIPHER_MODE_CTR: + return "ctr(des)"; + default: + return "des"; + } + break; + case CIPHER_ALG_3DES: + switch (mode) { + case CIPHER_MODE_CBC: + return "cbc(des3_ede)"; + case CIPHER_MODE_ECB: + return "ecb(des3_ede)"; + case CIPHER_MODE_CTR: + return "ctr(des3_ede)"; + default: + return "3des"; + } + break; + default: + return "other"; + } +} + +static ssize_t spu_debugfs_read(struct file *filp, char __user *ubuf, + size_t count, loff_t *offp) +{ + struct device_private *ipriv; + char *buf; + ssize_t ret, out_offset, out_count; + int i; + u32 fifo_len; + u32 spu_ofifo_ctrl; + u32 alg; + u32 mode; + u32 op_cnt; + + out_count = 2048; + + buf = kmalloc(out_count, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ipriv = filp->private_data; + out_offset = 0; + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Number of SPUs.........%u\n", + ipriv->spu.num_spu); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Current sessions.......%u\n", + atomic_read(&ipriv->session_count)); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Session count..........%u\n", + atomic_read(&ipriv->stream_count)); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Cipher setkey..........%u\n", + atomic_read(&ipriv->setkey_cnt[SPU_OP_CIPHER])); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Cipher Ops.............%u\n", + atomic_read(&ipriv->op_counts[SPU_OP_CIPHER])); + for (alg = 0; alg < CIPHER_ALG_LAST; alg++) { + for (mode = 0; mode < CIPHER_MODE_LAST; mode++) { + op_cnt = atomic_read(&ipriv->cipher_cnt[alg][mode]); + if (op_cnt) { + out_offset += snprintf(buf + out_offset, + out_count - out_offset, + " %-13s%11u\n", + spu_alg_name(alg, mode), op_cnt); + } + } + } + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Hash Ops...............%u\n", + atomic_read(&ipriv->op_counts[SPU_OP_HASH])); + for (alg = 0; alg < HASH_ALG_LAST; alg++) { + op_cnt = atomic_read(&ipriv->hash_cnt[alg]); + if (op_cnt) { + out_offset += snprintf(buf + out_offset, + out_count - out_offset, + " %-13s%11u\n", + hash_alg_name[alg], op_cnt); + } + } + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "HMAC setkey............%u\n", + atomic_read(&ipriv->setkey_cnt[SPU_OP_HMAC])); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "HMAC Ops...............%u\n", + atomic_read(&ipriv->op_counts[SPU_OP_HMAC])); + for (alg = 0; alg < HASH_ALG_LAST; alg++) { + op_cnt = atomic_read(&ipriv->hmac_cnt[alg]); + if (op_cnt) { + out_offset += snprintf(buf + out_offset, + out_count - out_offset, + " %-13s%11u\n", + hash_alg_name[alg], op_cnt); + } + } + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "AEAD setkey............%u\n", + atomic_read(&ipriv->setkey_cnt[SPU_OP_AEAD])); + + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "AEAD Ops...............%u\n", + atomic_read(&ipriv->op_counts[SPU_OP_AEAD])); + for (alg = 0; alg < AEAD_TYPE_LAST; alg++) { + op_cnt = atomic_read(&ipriv->aead_cnt[alg]); + if (op_cnt) { + out_offset += snprintf(buf + out_offset, + out_count - out_offset, + " %-13s%11u\n", + aead_alg_name[alg], op_cnt); + } + } + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Bytes of req data......%llu\n", + (u64)atomic64_read(&ipriv->bytes_out)); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Bytes of resp data.....%llu\n", + (u64)atomic64_read(&ipriv->bytes_in)); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Mailbox full...........%u\n", + atomic_read(&ipriv->mb_no_spc)); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Mailbox send failures..%u\n", + atomic_read(&ipriv->mb_send_fail)); + out_offset += snprintf(buf + out_offset, out_count - out_offset, + "Check ICV errors.......%u\n", + atomic_read(&ipriv->bad_icv)); + if (ipriv->spu.spu_type == SPU_TYPE_SPUM) + for (i = 0; i < ipriv->spu.num_spu; i++) { + spu_ofifo_ctrl = ioread32(ipriv->spu.reg_vbase[i] + + SPU_OFIFO_CTRL); + fifo_len = spu_ofifo_ctrl & SPU_FIFO_WATERMARK; + out_offset += snprintf(buf + out_offset, + out_count - out_offset, + "SPU %d output FIFO high water.....%u\n", + i, fifo_len); + } + + if (out_offset > out_count) + out_offset = out_count; + + ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset); + kfree(buf); + return ret; +} + +static const struct file_operations spu_debugfs_stats = { + .owner = THIS_MODULE, + .open = simple_open, + .read = spu_debugfs_read, +}; + +/* + * Create the debug FS directories. If the top-level directory has not yet + * been created, create it now. Create a stats file in this directory for + * a SPU. + */ +void spu_setup_debugfs(void) +{ + if (!debugfs_initialized()) + return; + + if (!iproc_priv.debugfs_dir) + iproc_priv.debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, + NULL); + + if (!iproc_priv.debugfs_stats) + /* Create file with permissions S_IRUSR */ + debugfs_create_file("stats", 0400, iproc_priv.debugfs_dir, + &iproc_priv, &spu_debugfs_stats); +} + +void spu_free_debugfs(void) +{ + debugfs_remove_recursive(iproc_priv.debugfs_dir); + iproc_priv.debugfs_dir = NULL; +} + +/** + * format_value_ccm() - Format a value into a buffer, using a specified number + * of bytes (i.e. maybe writing value X into a 4 byte + * buffer, or maybe into a 12 byte buffer), as per the + * SPU CCM spec. + * + * @val: value to write (up to max of unsigned int) + * @buf: (pointer to) buffer to write the value + * @len: number of bytes to use (0 to 255) + * + */ +void format_value_ccm(unsigned int val, u8 *buf, u8 len) +{ + int i; + + /* First clear full output buffer */ + memset(buf, 0, len); + + /* Then, starting from right side, fill in with data */ + for (i = 0; i < len; i++) { + buf[len - i - 1] = (val >> (8 * i)) & 0xff; + if (i >= 3) + break; /* Only handle up to 32 bits of 'val' */ + } +} |