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-rw-r--r--drivers/crypto/bcm/util.c580
1 files changed, 580 insertions, 0 deletions
diff --git a/drivers/crypto/bcm/util.c b/drivers/crypto/bcm/util.c
new file mode 100644
index 000000000..f96d1dade
--- /dev/null
+++ b/drivers/crypto/bcm/util.c
@@ -0,0 +1,580 @@
+/*
+ * 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\n", __func__, name, rc);
+ return rc;
+ }
+
+ size = sizeof(struct shash_desc) + crypto_shash_descsize(hash);
+ sdesc = kmalloc(size, GFP_KERNEL);
+ if (!sdesc) {
+ rc = -ENOMEM;
+ 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\n", __func__, name);
+ goto do_shash_err;
+ }
+ }
+
+ rc = crypto_shash_init(&sdesc->shash);
+ if (rc) {
+ pr_err("%s: Could not init %s shash\n", __func__, name);
+ goto do_shash_err;
+ }
+ rc = crypto_shash_update(&sdesc->shash, data1, data1_len);
+ if (rc) {
+ pr_err("%s: Could not update1\n", __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\n", __func__);
+ goto do_shash_err;
+ }
+ }
+ rc = crypto_shash_final(&sdesc->shash, result);
+ if (rc)
+ pr_err("%s: Could not generate %s hash\n", __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 bcm_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' */
+ }
+}
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