[linux-2.6-block.git] / drivers / crypto / bcm / util.c

/*
 * 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_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 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' */
	}
}
Commit	Line	Data
9d12ba86 RR	1	/*
	2	* Copyright 2016 Broadcom
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License, version 2, as
	6	* published by the Free Software Foundation (the "GPL").
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	11	* General Public License version 2 (GPLv2) for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* version 2 (GPLv2) along with this source code.
	15	*/
	16
	17	#include <linux/debugfs.h>
	18
	19	#include "cipher.h"
	20	#include "util.h"
	21
	22	/* offset of SPU_OFIFO_CTRL register */
	23	#define SPU_OFIFO_CTRL 0x40
	24	#define SPU_FIFO_WATERMARK 0x1FF
	25
	26	/**
	27	* spu_sg_at_offset() - Find the scatterlist entry at a given distance from the
	28	* start of a scatterlist.
	29	* @sg: [in] Start of a scatterlist
	30	* @skip: [in] Distance from the start of the scatterlist, in bytes
	31	* @sge: [out] Scatterlist entry at skip bytes from start
	32	* @sge_offset: [out] Number of bytes from start of sge buffer to get to
	33	* requested distance.
	34	*
	35	* Return: 0 if entry found at requested distance
	36	* < 0 otherwise
	37	*/
	38	int spu_sg_at_offset(struct scatterlist *sg, unsigned int skip,
	39	struct scatterlist *sge, unsigned int sge_offset)
	40	{
	41	/* byte index from start of sg to the end of the previous entry */
	42	unsigned int index = 0;
	43	/* byte index from start of sg to the end of the current entry */
	44	unsigned int next_index;
	45
	46	next_index = sg->length;
	47	while (next_index <= skip) {
	48	sg = sg_next(sg);
	49	index = next_index;
	50	if (!sg)
	51	return -EINVAL;
	52	next_index += sg->length;
	53	}
	54
	55	*sge_offset = skip - index;
	56	*sge = sg;
	57	return 0;
	58	}
	59
	60	/* Copy len bytes of sg data, starting at offset skip, to a dest buffer */
	61	void sg_copy_part_to_buf(struct scatterlist src, u8 dest,
	62	unsigned int len, unsigned int skip)
	63	{
	64	size_t copied;
65	unsigned int nents = sg_nents(src);
66
67	copied = sg_pcopy_to_buffer(src, nents, dest, len, skip);
68	if (copied != len) {
69	flow_log("%s copied %u bytes of %u requested. ",
70	__func__, (u32)copied, len);
71	flow_log("sg with %u entries and skip %u\n", nents, skip);
72	}
73	}
74
75	/*
76	* Copy data into a scatterlist starting at a specified offset in the
77	* scatterlist. Specifically, copy len bytes of data in the buffer src
78	* into the scatterlist dest, starting skip bytes into the scatterlist.
79	*/
80	void sg_copy_part_from_buf(struct scatterlist dest, u8 src,
81	unsigned int len, unsigned int skip)
82	{
83	size_t copied;
84	unsigned int nents = sg_nents(dest);
85
86	copied = sg_pcopy_from_buffer(dest, nents, src, len, skip);
87	if (copied != len) {
88	flow_log("%s copied %u bytes of %u requested. ",
89	__func__, (u32)copied, len);
90	flow_log("sg with %u entries and skip %u\n", nents, skip);
91	}
92	}
93
94	/**
95	* spu_sg_count() - Determine number of elements in scatterlist to provide a
96	* specified number of bytes.
97	* @sg_list: scatterlist to examine
98	* @skip: index of starting point
99	* @nbytes: consider elements of scatterlist until reaching this number of
100	* bytes
101	*
102	* Return: the number of sg entries contributing to nbytes of data
103	*/
104	int spu_sg_count(struct scatterlist *sg_list, unsigned int skip, int nbytes)
105	{
106	struct scatterlist *sg;
107	int sg_nents = 0;
108	unsigned int offset;
109
110	if (!sg_list)
111	return 0;
112
113	if (spu_sg_at_offset(sg_list, skip, &sg, &offset) < 0)
114	return 0;
115
116	while (sg && (nbytes > 0)) {
117	sg_nents++;
118	nbytes -= (sg->length - offset);
119	offset = 0;
120	sg = sg_next(sg);
121	}
122	return sg_nents;
123	}
124
125	/**
126	* spu_msg_sg_add() - Copy scatterlist entries from one sg to another, up to a
127	* given length.
128	* @to_sg: scatterlist to copy to
129	* @from_sg: scatterlist to copy from
130	* @from_skip: number of bytes to skip in from_sg. Non-zero when previous
131	* request included part of the buffer in entry in from_sg.
132	* Assumes from_skip < from_sg->length.
133	* @from_nents number of entries in from_sg
134	* @length number of bytes to copy. may reach this limit before exhausting
135	* from_sg.
136	*
137	* Copies the entries themselves, not the data in the entries. Assumes to_sg has
138	* enough entries. Does not limit the size of an individual buffer in to_sg.
139	*
140	* to_sg, from_sg, skip are all updated to end of copy
141	*
142	* Return: Number of bytes copied
143	*/
144	u32 spu_msg_sg_add(struct scatterlist **to_sg,
145	struct scatterlist *from_sg, u32 from_skip,
146	u8 from_nents, u32 length)
147	{
148	struct scatterlist sg; / an entry in from_sg */
149	struct scatterlist to = to_sg;
150	struct scatterlist from = from_sg;
151	u32 skip = *from_skip;
152	u32 offset;
153	int i;
154	u32 entry_len = 0;
155	u32 frag_len = 0; /* length of entry added to to_sg */
156	u32 copied = 0; /* number of bytes copied so far */
157
158	if (length == 0)
159	return 0;
160
161	for_each_sg(from, sg, from_nents, i) {
162	/* number of bytes in this from entry not yet used */
163	entry_len = sg->length - skip;
164	frag_len = min(entry_len, length - copied);
165	offset = sg->offset + skip;
166	if (frag_len)
167	sg_set_page(to++, sg_page(sg), frag_len, offset);
168	copied += frag_len;
169	if (copied == entry_len) {
170	/* used up all of from entry */
171	skip = 0; /* start at beginning of next entry */
172	}
173	if (copied == length)
174	break;
175	}
176	*to_sg = to;
177	*from_sg = sg;
178	if (frag_len < entry_len)
179	*from_skip = skip + frag_len;
180	else
181	*from_skip = 0;
182
183	return copied;
184	}
185
186	void add_to_ctr(u8 *ctr_pos, unsigned int increment)
187	{
188	__be64 high_be = (__be64 )ctr_pos;
189	__be64 *low_be = high_be + 1;
190	u64 orig_low = __be64_to_cpu(*low_be);
191	u64 new_low = orig_low + (u64)increment;
192
193	*low_be = __cpu_to_be64(new_low);
194	if (new_low < orig_low)
195	/* there was a carry from the low 8 bytes */
196	high_be = __cpu_to_be64(__be64_to_cpu(high_be) + 1);
197	}
198
199	struct sdesc {
200	struct shash_desc shash;
201	char ctx[];
202	};
203
9d12ba86 RR	204	/**
	205	* do_shash() - Do a synchronous hash operation in software
	206	* @name: The name of the hash algorithm
	207	* @result: Buffer where digest is to be written
	208	* @data1: First part of data to hash. May be NULL.
	209	* @data1_len: Length of data1, in bytes
	210	* @data2: Second part of data to hash. May be NULL.
	211	* @data2_len: Length of data2, in bytes
	212	* @key: Key (if keyed hash)
	213	* @key_len: Length of key, in bytes (or 0 if non-keyed hash)
	214	*
	215	* Note that the crypto API will not select this driver's own transform because
	216	* this driver only registers asynchronous algos.
	217	*
	218	* Return: 0 if hash successfully stored in result
	219	* < 0 otherwise
	220	*/
	221	int do_shash(unsigned char name, unsigned char result,
	222	const u8 *data1, unsigned int data1_len,
	223	const u8 *data2, unsigned int data2_len,
	224	const u8 *key, unsigned int key_len)
	225	{
	226	int rc;
	227	unsigned int size;
	228	struct crypto_shash *hash;
	229	struct sdesc *sdesc;
	230
	231	hash = crypto_alloc_shash(name, 0, 0);
	232	if (IS_ERR(hash)) {
	233	rc = PTR_ERR(hash);
924c9e36	234	pr_err("%s: Crypto %s allocation error %d\n", __func__, name, rc);
9d12ba86 RR	235	return rc;
	236	}
	237
	238	size = sizeof(struct shash_desc) + crypto_shash_descsize(hash);
	239	sdesc = kmalloc(size, GFP_KERNEL);
	240	if (!sdesc) {
	241	rc = -ENOMEM;
9d12ba86 RR	242	goto do_shash_err;
	243	}
	244	sdesc->shash.tfm = hash;
	245	sdesc->shash.flags = 0x0;
	246
	247	if (key_len > 0) {
	248	rc = crypto_shash_setkey(hash, key, key_len);
	249	if (rc) {
924c9e36	250	pr_err("%s: Could not setkey %s shash\n", __func__, name);
9d12ba86 RR	251	goto do_shash_err;
	252	}
	253	}
	254
	255	rc = crypto_shash_init(&sdesc->shash);
	256	if (rc) {
924c9e36	257	pr_err("%s: Could not init %s shash\n", __func__, name);
9d12ba86 RR	258	goto do_shash_err;
	259	}
	260	rc = crypto_shash_update(&sdesc->shash, data1, data1_len);
	261	if (rc) {
924c9e36	262	pr_err("%s: Could not update1\n", __func__);
9d12ba86 RR	263	goto do_shash_err;
	264	}
	265	if (data2 && data2_len) {
	266	rc = crypto_shash_update(&sdesc->shash, data2, data2_len);
	267	if (rc) {
924c9e36	268	pr_err("%s: Could not update2\n", __func__);
9d12ba86 RR	269	goto do_shash_err;
	270	}
	271	}
	272	rc = crypto_shash_final(&sdesc->shash, result);
	273	if (rc)
924c9e36	274	pr_err("%s: Could not generate %s hash\n", __func__, name);
9d12ba86 RR	275
	276	do_shash_err:
	277	crypto_free_shash(hash);
	278	kfree(sdesc);
	279
	280	return rc;
	281	}
	282
	283	/* Dump len bytes of a scatterlist starting at skip bytes into the sg */
	284	void __dump_sg(struct scatterlist *sg, unsigned int skip, unsigned int len)
	285	{
	286	u8 dbuf[16];
	287	unsigned int idx = skip;
	288	unsigned int num_out = 0; /* number of bytes dumped so far */
	289	unsigned int count;
	290
	291	if (packet_debug_logging) {
	292	while (num_out < len) {
	293	count = (len - num_out > 16) ? 16 : len - num_out;
	294	sg_copy_part_to_buf(sg, dbuf, count, idx);
	295	num_out += count;
	296	print_hex_dump(KERN_ALERT, " sg: ", DUMP_PREFIX_NONE,
	297	4, 1, dbuf, count, false);
	298	idx += 16;
	299	}
	300	}
	301	if (debug_logging_sleep)
	302	msleep(debug_logging_sleep);
	303	}
	304
	305	/* Returns the name for a given cipher alg/mode */
	306	char *spu_alg_name(enum spu_cipher_alg alg, enum spu_cipher_mode mode)
	307	{
	308	switch (alg) {
	309	case CIPHER_ALG_RC4:
	310	return "rc4";
	311	case CIPHER_ALG_AES:
	312	switch (mode) {
	313	case CIPHER_MODE_CBC:
	314	return "cbc(aes)";
	315	case CIPHER_MODE_ECB:
	316	return "ecb(aes)";
	317	case CIPHER_MODE_OFB:
	318	return "ofb(aes)";
	319	case CIPHER_MODE_CFB:
	320	return "cfb(aes)";
	321	case CIPHER_MODE_CTR:
	322	return "ctr(aes)";
	323	case CIPHER_MODE_XTS:
	324	return "xts(aes)";
	325	case CIPHER_MODE_GCM:
	326	return "gcm(aes)";
	327	default:
	328	return "aes";
	329	}
	330	break;
	331	case CIPHER_ALG_DES:
	332	switch (mode) {
	333	case CIPHER_MODE_CBC:
	334	return "cbc(des)";
	335	case CIPHER_MODE_ECB:
	336	return "ecb(des)";
	337	case CIPHER_MODE_CTR:
	338	return "ctr(des)";
339	default:
340	return "des";
341	}
342	break;
343	case CIPHER_ALG_3DES:
344	switch (mode) {
345	case CIPHER_MODE_CBC:
346	return "cbc(des3_ede)";
347	case CIPHER_MODE_ECB:
348	return "ecb(des3_ede)";
349	case CIPHER_MODE_CTR:
350	return "ctr(des3_ede)";
351	default:
352	return "3des";
353	}
354	break;
355	default:
356	return "other";
357	}
358	}
359
360	static ssize_t spu_debugfs_read(struct file filp, char __user ubuf,
361	size_t count, loff_t *offp)
362	{
363	struct device_private *ipriv;
364	char *buf;
365	ssize_t ret, out_offset, out_count;
366	int i;
367	u32 fifo_len;
368	u32 spu_ofifo_ctrl;
369	u32 alg;
370	u32 mode;
371	u32 op_cnt;
372
373	out_count = 2048;
374
375	buf = kmalloc(out_count, GFP_KERNEL);
376	if (!buf)
377	return -ENOMEM;
378
379	ipriv = filp->private_data;
380	out_offset = 0;
381	out_offset += snprintf(buf + out_offset, out_count - out_offset,
382	"Number of SPUs.........%u\n",
383	ipriv->spu.num_spu);
384	out_offset += snprintf(buf + out_offset, out_count - out_offset,
385	"Current sessions.......%u\n",
386	atomic_read(&ipriv->session_count));
387	out_offset += snprintf(buf + out_offset, out_count - out_offset,
388	"Session count..........%u\n",
389	atomic_read(&ipriv->stream_count));
390	out_offset += snprintf(buf + out_offset, out_count - out_offset,
391	"Cipher setkey..........%u\n",
392	atomic_read(&ipriv->setkey_cnt[SPU_OP_CIPHER]));
393	out_offset += snprintf(buf + out_offset, out_count - out_offset,
394	"Cipher Ops.............%u\n",
395	atomic_read(&ipriv->op_counts[SPU_OP_CIPHER]));
396	for (alg = 0; alg < CIPHER_ALG_LAST; alg++) {
397	for (mode = 0; mode < CIPHER_MODE_LAST; mode++) {
398	op_cnt = atomic_read(&ipriv->cipher_cnt[alg][mode]);
399	if (op_cnt) {
400	out_offset += snprintf(buf + out_offset,
401	out_count - out_offset,
402	" %-13s%11u\n",
403	spu_alg_name(alg, mode), op_cnt);
404	}
405	}
406	}
407	out_offset += snprintf(buf + out_offset, out_count - out_offset,
408	"Hash Ops...............%u\n",
409	atomic_read(&ipriv->op_counts[SPU_OP_HASH]));
410	for (alg = 0; alg < HASH_ALG_LAST; alg++) {
411	op_cnt = atomic_read(&ipriv->hash_cnt[alg]);
412	if (op_cnt) {
413	out_offset += snprintf(buf + out_offset,
414	out_count - out_offset,
415	" %-13s%11u\n",
416	hash_alg_name[alg], op_cnt);
417	}
418	}
419	out_offset += snprintf(buf + out_offset, out_count - out_offset,
420	"HMAC setkey............%u\n",
421	atomic_read(&ipriv->setkey_cnt[SPU_OP_HMAC]));
422	out_offset += snprintf(buf + out_offset, out_count - out_offset,
423	"HMAC Ops...............%u\n",
424	atomic_read(&ipriv->op_counts[SPU_OP_HMAC]));
425	for (alg = 0; alg < HASH_ALG_LAST; alg++) {
426	op_cnt = atomic_read(&ipriv->hmac_cnt[alg]);
427	if (op_cnt) {
428	out_offset += snprintf(buf + out_offset,
429	out_count - out_offset,
430	" %-13s%11u\n",
431	hash_alg_name[alg], op_cnt);
432	}
433	}
434	out_offset += snprintf(buf + out_offset, out_count - out_offset,
435	"AEAD setkey............%u\n",
436	atomic_read(&ipriv->setkey_cnt[SPU_OP_AEAD]));
437
438	out_offset += snprintf(buf + out_offset, out_count - out_offset,
439	"AEAD Ops...............%u\n",
440	atomic_read(&ipriv->op_counts[SPU_OP_AEAD]));
441	for (alg = 0; alg < AEAD_TYPE_LAST; alg++) {
442	op_cnt = atomic_read(&ipriv->aead_cnt[alg]);
443	if (op_cnt) {
444	out_offset += snprintf(buf + out_offset,
445	out_count - out_offset,
446	" %-13s%11u\n",
447	aead_alg_name[alg], op_cnt);
448	}
449	}
450	out_offset += snprintf(buf + out_offset, out_count - out_offset,
451	"Bytes of req data......%llu\n",
452	(u64)atomic64_read(&ipriv->bytes_out));
453	out_offset += snprintf(buf + out_offset, out_count - out_offset,
454	"Bytes of resp data.....%llu\n",
455	(u64)atomic64_read(&ipriv->bytes_in));
456	out_offset += snprintf(buf + out_offset, out_count - out_offset,
457	"Mailbox full...........%u\n",
458	atomic_read(&ipriv->mb_no_spc));
459	out_offset += snprintf(buf + out_offset, out_count - out_offset,
460	"Mailbox send failures..%u\n",
461	atomic_read(&ipriv->mb_send_fail));
462	out_offset += snprintf(buf + out_offset, out_count - out_offset,
463	"Check ICV errors.......%u\n",
464	atomic_read(&ipriv->bad_icv));
465	if (ipriv->spu.spu_type == SPU_TYPE_SPUM)
466	for (i = 0; i < ipriv->spu.num_spu; i++) {
467	spu_ofifo_ctrl = ioread32(ipriv->spu.reg_vbase[i] +
468	SPU_OFIFO_CTRL);
469	fifo_len = spu_ofifo_ctrl & SPU_FIFO_WATERMARK;
470	out_offset += snprintf(buf + out_offset,
471	out_count - out_offset,
472	"SPU %d output FIFO high water.....%u\n",
473	i, fifo_len);
474	}
475
476	if (out_offset > out_count)
477	out_offset = out_count;
478
479	ret = simple_read_from_buffer(ubuf, count, offp, buf, out_offset);
480	kfree(buf);
481	return ret;
482	}
483
484	static const struct file_operations spu_debugfs_stats = {
485	.owner = THIS_MODULE,
486	.open = simple_open,
487	.read = spu_debugfs_read,
488	};
489
490	/*
491	* Create the debug FS directories. If the top-level directory has not yet
492	* been created, create it now. Create a stats file in this directory for
493	* a SPU.
494	*/
495	void spu_setup_debugfs(void)
496	{
497	if (!debugfs_initialized())
498	return;
499
500	if (!iproc_priv.debugfs_dir)
501	iproc_priv.debugfs_dir = debugfs_create_dir(KBUILD_MODNAME,
502	NULL);
503
504	if (!iproc_priv.debugfs_stats)
505	/* Create file with permissions S_IRUSR */
506	debugfs_create_file("stats", 0400, iproc_priv.debugfs_dir,
507	&iproc_priv, &spu_debugfs_stats);
508	}
509
510	void spu_free_debugfs(void)
511	{
512	debugfs_remove_recursive(iproc_priv.debugfs_dir);
513	iproc_priv.debugfs_dir = NULL;
514	}
515
516	/**
517	* format_value_ccm() - Format a value into a buffer, using a specified number
518	* of bytes (i.e. maybe writing value X into a 4 byte
519	* buffer, or maybe into a 12 byte buffer), as per the
520	* SPU CCM spec.
521	*
522	* @val: value to write (up to max of unsigned int)
523	* @buf: (pointer to) buffer to write the value
524	* @len: number of bytes to use (0 to 255)
525	*
526	*/
527	void format_value_ccm(unsigned int val, u8 *buf, u8 len)
528	{
529	int i;
530
531	/* First clear full output buffer */
532	memset(buf, 0, len);
533
534	/* Then, starting from right side, fill in with data */
535	for (i = 0; i < len; i++) {
536	buf[len - i - 1] = (val >> (8 * i)) & 0xff;
537	if (i >= 3)
538	break; /* Only handle up to 32 bits of 'val' */
539	}
540	}