Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

[mirror_ubuntu-hirsute-kernel.git] / drivers / crypto / n2_core.c

// SPDX-License-Identifier: GPL-2.0-only
/* n2_core.c: Niagara2 Stream Processing Unit (SPU) crypto support.
 *
 * Copyright (C) 2010, 2011 David S. Miller <davem@davemloft.net>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/cpumask.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/crypto.h>
#include <crypto/md5.h>
#include <crypto/sha.h>
#include <crypto/aes.h>
#include <crypto/internal/des.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/sched.h>

#include <crypto/internal/hash.h>
#include <crypto/internal/skcipher.h>
#include <crypto/scatterwalk.h>
#include <crypto/algapi.h>

#include <asm/hypervisor.h>
#include <asm/mdesc.h>

#include "n2_core.h"

#define DRV_MODULE_NAME         "n2_crypto"
#define DRV_MODULE_VERSION      "0.2"
#define DRV_MODULE_RELDATE      "July 28, 2011"

static const char version[] =
        DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";

MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Niagara2 Crypto driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);

#define N2_CRA_PRIORITY         200

static DEFINE_MUTEX(spu_lock);

struct spu_queue {
        cpumask_t               sharing;
        unsigned long           qhandle;

        spinlock_t              lock;
        u8                      q_type;
        void                    *q;
        unsigned long           head;
        unsigned long           tail;
        struct list_head        jobs;

        unsigned long           devino;

        char                    irq_name[32];
        unsigned int            irq;

        struct list_head        list;
};

struct spu_qreg {
        struct spu_queue        *queue;
        unsigned long           type;
};

static struct spu_queue **cpu_to_cwq;
static struct spu_queue **cpu_to_mau;

static unsigned long spu_next_offset(struct spu_queue *q, unsigned long off)
{
        if (q->q_type == HV_NCS_QTYPE_MAU) {
                off += MAU_ENTRY_SIZE;
                if (off == (MAU_ENTRY_SIZE * MAU_NUM_ENTRIES))
                        off = 0;
        } else {
                off += CWQ_ENTRY_SIZE;
                if (off == (CWQ_ENTRY_SIZE * CWQ_NUM_ENTRIES))
                        off = 0;
        }
        return off;
}

struct n2_request_common {
        struct list_head        entry;
        unsigned int            offset;
};
#define OFFSET_NOT_RUNNING      (~(unsigned int)0)

/* An async job request records the final tail value it used in
 * n2_request_common->offset, test to see if that offset is in
 * the range old_head, new_head, inclusive.
 */
static inline bool job_finished(struct spu_queue *q, unsigned int offset,
                                unsigned long old_head, unsigned long new_head)
{
        if (old_head <= new_head) {
                if (offset > old_head && offset <= new_head)
                        return true;
        } else {
                if (offset > old_head || offset <= new_head)
                        return true;
        }
        return false;
}

/* When the HEAD marker is unequal to the actual HEAD, we get
 * a virtual device INO interrupt.  We should process the
 * completed CWQ entries and adjust the HEAD marker to clear
 * the IRQ.
 */
static irqreturn_t cwq_intr(int irq, void *dev_id)
{
        unsigned long off, new_head, hv_ret;
        struct spu_queue *q = dev_id;

        pr_err("CPU[%d]: Got CWQ interrupt for qhdl[%lx]\n",
               smp_processor_id(), q->qhandle);

        spin_lock(&q->lock);

        hv_ret = sun4v_ncs_gethead(q->qhandle, &new_head);

        pr_err("CPU[%d]: CWQ gethead[%lx] hv_ret[%lu]\n",
               smp_processor_id(), new_head, hv_ret);

        for (off = q->head; off != new_head; off = spu_next_offset(q, off)) {
                /* XXX ... XXX */
        }

        hv_ret = sun4v_ncs_sethead_marker(q->qhandle, new_head);
        if (hv_ret == HV_EOK)
                q->head = new_head;

        spin_unlock(&q->lock);

        return IRQ_HANDLED;
}

static irqreturn_t mau_intr(int irq, void *dev_id)
{
        struct spu_queue *q = dev_id;
        unsigned long head, hv_ret;

        spin_lock(&q->lock);

        pr_err("CPU[%d]: Got MAU interrupt for qhdl[%lx]\n",
               smp_processor_id(), q->qhandle);

        hv_ret = sun4v_ncs_gethead(q->qhandle, &head);

        pr_err("CPU[%d]: MAU gethead[%lx] hv_ret[%lu]\n",
               smp_processor_id(), head, hv_ret);

        sun4v_ncs_sethead_marker(q->qhandle, head);

        spin_unlock(&q->lock);

        return IRQ_HANDLED;
}

static void *spu_queue_next(struct spu_queue *q, void *cur)
{
        return q->q + spu_next_offset(q, cur - q->q);
}

static int spu_queue_num_free(struct spu_queue *q)
{
        unsigned long head = q->head;
        unsigned long tail = q->tail;
        unsigned long end = (CWQ_ENTRY_SIZE * CWQ_NUM_ENTRIES);
        unsigned long diff;

        if (head > tail)
                diff = head - tail;
        else
                diff = (end - tail) + head;

        return (diff / CWQ_ENTRY_SIZE) - 1;
}

static void *spu_queue_alloc(struct spu_queue *q, int num_entries)
{
        int avail = spu_queue_num_free(q);

        if (avail >= num_entries)
                return q->q + q->tail;

        return NULL;
}

static unsigned long spu_queue_submit(struct spu_queue *q, void *last)
{
        unsigned long hv_ret, new_tail;

        new_tail = spu_next_offset(q, last - q->q);

        hv_ret = sun4v_ncs_settail(q->qhandle, new_tail);
        if (hv_ret == HV_EOK)
                q->tail = new_tail;
        return hv_ret;
}

static u64 control_word_base(unsigned int len, unsigned int hmac_key_len,
                             int enc_type, int auth_type,
                             unsigned int hash_len,
                             bool sfas, bool sob, bool eob, bool encrypt,
                             int opcode)
{
        u64 word = (len - 1) & CONTROL_LEN;

        word |= ((u64) opcode << CONTROL_OPCODE_SHIFT);
        word |= ((u64) enc_type << CONTROL_ENC_TYPE_SHIFT);
        word |= ((u64) auth_type << CONTROL_AUTH_TYPE_SHIFT);
        if (sfas)
                word |= CONTROL_STORE_FINAL_AUTH_STATE;
        if (sob)
                word |= CONTROL_START_OF_BLOCK;
        if (eob)
                word |= CONTROL_END_OF_BLOCK;
        if (encrypt)
                word |= CONTROL_ENCRYPT;
        if (hmac_key_len)
                word |= ((u64) (hmac_key_len - 1)) << CONTROL_HMAC_KEY_LEN_SHIFT;
        if (hash_len)
                word |= ((u64) (hash_len - 1)) << CONTROL_HASH_LEN_SHIFT;

        return word;
}

#if 0
static inline bool n2_should_run_async(struct spu_queue *qp, int this_len)
{
        if (this_len >= 64 ||
            qp->head != qp->tail)
                return true;
        return false;
}
#endif

struct n2_ahash_alg {
        struct list_head        entry;
        const u8                *hash_zero;
        const u32               *hash_init;
        u8                      hw_op_hashsz;
        u8                      digest_size;
        u8                      auth_type;
        u8                      hmac_type;
        struct ahash_alg        alg;
};

static inline struct n2_ahash_alg *n2_ahash_alg(struct crypto_tfm *tfm)
{
        struct crypto_alg *alg = tfm->__crt_alg;
        struct ahash_alg *ahash_alg;

        ahash_alg = container_of(alg, struct ahash_alg, halg.base);

        return container_of(ahash_alg, struct n2_ahash_alg, alg);
}

struct n2_hmac_alg {
        const char              *child_alg;
        struct n2_ahash_alg     derived;
};

static inline struct n2_hmac_alg *n2_hmac_alg(struct crypto_tfm *tfm)
{
        struct crypto_alg *alg = tfm->__crt_alg;
        struct ahash_alg *ahash_alg;

        ahash_alg = container_of(alg, struct ahash_alg, halg.base);

        return container_of(ahash_alg, struct n2_hmac_alg, derived.alg);
}

struct n2_hash_ctx {
        struct crypto_ahash             *fallback_tfm;
};

#define N2_HASH_KEY_MAX                 32 /* HW limit for all HMAC requests */

struct n2_hmac_ctx {
        struct n2_hash_ctx              base;

        struct crypto_shash             *child_shash;

        int                             hash_key_len;
        unsigned char                   hash_key[N2_HASH_KEY_MAX];
};

struct n2_hash_req_ctx {
        union {
                struct md5_state        md5;
                struct sha1_state       sha1;
                struct sha256_state     sha256;
        } u;

        struct ahash_request            fallback_req;
};

static int n2_hash_async_init(struct ahash_request *req)
{
        struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct n2_hash_ctx *ctx = crypto_ahash_ctx(tfm);

        ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
        rctx->fallback_req.base.flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;

        return crypto_ahash_init(&rctx->fallback_req);
}

static int n2_hash_async_update(struct ahash_request *req)
{
        struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct n2_hash_ctx *ctx = crypto_ahash_ctx(tfm);

        ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
        rctx->fallback_req.base.flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
        rctx->fallback_req.nbytes = req->nbytes;
        rctx->fallback_req.src = req->src;

        return crypto_ahash_update(&rctx->fallback_req);
}

static int n2_hash_async_final(struct ahash_request *req)
{
        struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct n2_hash_ctx *ctx = crypto_ahash_ctx(tfm);

        ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
        rctx->fallback_req.base.flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
        rctx->fallback_req.result = req->result;

        return crypto_ahash_final(&rctx->fallback_req);
}

static int n2_hash_async_finup(struct ahash_request *req)
{
        struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct n2_hash_ctx *ctx = crypto_ahash_ctx(tfm);

        ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
        rctx->fallback_req.base.flags = req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
        rctx->fallback_req.nbytes = req->nbytes;
        rctx->fallback_req.src = req->src;
        rctx->fallback_req.result = req->result;

        return crypto_ahash_finup(&rctx->fallback_req);
}

static int n2_hash_async_noimport(struct ahash_request *req, const void *in)
{
        return -ENOSYS;
}

static int n2_hash_async_noexport(struct ahash_request *req, void *out)
{
        return -ENOSYS;
}

static int n2_hash_cra_init(struct crypto_tfm *tfm)
{
        const char *fallback_driver_name = crypto_tfm_alg_name(tfm);
        struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
        struct n2_hash_ctx *ctx = crypto_ahash_ctx(ahash);
        struct crypto_ahash *fallback_tfm;
        int err;

        fallback_tfm = crypto_alloc_ahash(fallback_driver_name, 0,
                                          CRYPTO_ALG_NEED_FALLBACK);
        if (IS_ERR(fallback_tfm)) {
                pr_warn("Fallback driver '%s' could not be loaded!\n",
                        fallback_driver_name);
                err = PTR_ERR(fallback_tfm);
                goto out;
        }

        crypto_ahash_set_reqsize(ahash, (sizeof(struct n2_hash_req_ctx) +
                                         crypto_ahash_reqsize(fallback_tfm)));

        ctx->fallback_tfm = fallback_tfm;
        return 0;

out:
        return err;
}

static void n2_hash_cra_exit(struct crypto_tfm *tfm)
{
        struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
        struct n2_hash_ctx *ctx = crypto_ahash_ctx(ahash);

        crypto_free_ahash(ctx->fallback_tfm);
}

static int n2_hmac_cra_init(struct crypto_tfm *tfm)
{
        const char *fallback_driver_name = crypto_tfm_alg_name(tfm);
        struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
        struct n2_hmac_ctx *ctx = crypto_ahash_ctx(ahash);
        struct n2_hmac_alg *n2alg = n2_hmac_alg(tfm);
        struct crypto_ahash *fallback_tfm;
        struct crypto_shash *child_shash;
        int err;

        fallback_tfm = crypto_alloc_ahash(fallback_driver_name, 0,
                                          CRYPTO_ALG_NEED_FALLBACK);
        if (IS_ERR(fallback_tfm)) {
                pr_warn("Fallback driver '%s' could not be loaded!\n",
                        fallback_driver_name);
                err = PTR_ERR(fallback_tfm);
                goto out;
        }

        child_shash = crypto_alloc_shash(n2alg->child_alg, 0, 0);
        if (IS_ERR(child_shash)) {
                pr_warn("Child shash '%s' could not be loaded!\n",
                        n2alg->child_alg);
                err = PTR_ERR(child_shash);
                goto out_free_fallback;
        }

        crypto_ahash_set_reqsize(ahash, (sizeof(struct n2_hash_req_ctx) +
                                         crypto_ahash_reqsize(fallback_tfm)));

        ctx->child_shash = child_shash;
        ctx->base.fallback_tfm = fallback_tfm;
        return 0;

out_free_fallback:
        crypto_free_ahash(fallback_tfm);

out:
        return err;
}

static void n2_hmac_cra_exit(struct crypto_tfm *tfm)
{
        struct crypto_ahash *ahash = __crypto_ahash_cast(tfm);
        struct n2_hmac_ctx *ctx = crypto_ahash_ctx(ahash);

        crypto_free_ahash(ctx->base.fallback_tfm);
        crypto_free_shash(ctx->child_shash);
}

static int n2_hmac_async_setkey(struct crypto_ahash *tfm, const u8 *key,
                                unsigned int keylen)
{
        struct n2_hmac_ctx *ctx = crypto_ahash_ctx(tfm);
        struct crypto_shash *child_shash = ctx->child_shash;
        struct crypto_ahash *fallback_tfm;
        int err, bs, ds;

        fallback_tfm = ctx->base.fallback_tfm;
        err = crypto_ahash_setkey(fallback_tfm, key, keylen);
        if (err)
                return err;

        bs = crypto_shash_blocksize(child_shash);
        ds = crypto_shash_digestsize(child_shash);
        BUG_ON(ds > N2_HASH_KEY_MAX);
        if (keylen > bs) {
                err = crypto_shash_tfm_digest(child_shash, key, keylen,
                                              ctx->hash_key);
                if (err)
                        return err;
                keylen = ds;
        } else if (keylen <= N2_HASH_KEY_MAX)
                memcpy(ctx->hash_key, key, keylen);

        ctx->hash_key_len = keylen;

        return err;
}

static unsigned long wait_for_tail(struct spu_queue *qp)
{
        unsigned long head, hv_ret;

        do {
                hv_ret = sun4v_ncs_gethead(qp->qhandle, &head);
                if (hv_ret != HV_EOK) {
                        pr_err("Hypervisor error on gethead\n");
                        break;
                }
                if (head == qp->tail) {
                        qp->head = head;
                        break;
                }
        } while (1);
        return hv_ret;
}

static unsigned long submit_and_wait_for_tail(struct spu_queue *qp,
                                              struct cwq_initial_entry *ent)
{
        unsigned long hv_ret = spu_queue_submit(qp, ent);

        if (hv_ret == HV_EOK)
                hv_ret = wait_for_tail(qp);

        return hv_ret;
}

static int n2_do_async_digest(struct ahash_request *req,
                              unsigned int auth_type, unsigned int digest_size,
                              unsigned int result_size, void *hash_loc,
                              unsigned long auth_key, unsigned int auth_key_len)
{
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct cwq_initial_entry *ent;
        struct crypto_hash_walk walk;
        struct spu_queue *qp;
        unsigned long flags;
        int err = -ENODEV;
        int nbytes, cpu;

        /* The total effective length of the operation may not
         * exceed 2^16.
         */
        if (unlikely(req->nbytes > (1 << 16))) {
                struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
                struct n2_hash_ctx *ctx = crypto_ahash_ctx(tfm);

                ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
                rctx->fallback_req.base.flags =
                        req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
                rctx->fallback_req.nbytes = req->nbytes;
                rctx->fallback_req.src = req->src;
                rctx->fallback_req.result = req->result;

                return crypto_ahash_digest(&rctx->fallback_req);
        }

        nbytes = crypto_hash_walk_first(req, &walk);

        cpu = get_cpu();
        qp = cpu_to_cwq[cpu];
        if (!qp)
                goto out;

        spin_lock_irqsave(&qp->lock, flags);

        /* XXX can do better, improve this later by doing a by-hand scatterlist
         * XXX walk, etc.
         */
        ent = qp->q + qp->tail;

        ent->control = control_word_base(nbytes, auth_key_len, 0,
                                         auth_type, digest_size,
                                         false, true, false, false,
                                         OPCODE_INPLACE_BIT |
                                         OPCODE_AUTH_MAC);
        ent->src_addr = __pa(walk.data);
        ent->auth_key_addr = auth_key;
        ent->auth_iv_addr = __pa(hash_loc);
        ent->final_auth_state_addr = 0UL;
        ent->enc_key_addr = 0UL;
        ent->enc_iv_addr = 0UL;
        ent->dest_addr = __pa(hash_loc);

        nbytes = crypto_hash_walk_done(&walk, 0);
        while (nbytes > 0) {
                ent = spu_queue_next(qp, ent);

                ent->control = (nbytes - 1);
                ent->src_addr = __pa(walk.data);
                ent->auth_key_addr = 0UL;
                ent->auth_iv_addr = 0UL;
                ent->final_auth_state_addr = 0UL;
                ent->enc_key_addr = 0UL;
                ent->enc_iv_addr = 0UL;
                ent->dest_addr = 0UL;

                nbytes = crypto_hash_walk_done(&walk, 0);
        }
        ent->control |= CONTROL_END_OF_BLOCK;

        if (submit_and_wait_for_tail(qp, ent) != HV_EOK)
                err = -EINVAL;
        else
                err = 0;

        spin_unlock_irqrestore(&qp->lock, flags);

        if (!err)
                memcpy(req->result, hash_loc, result_size);
out:
        put_cpu();

        return err;
}

static int n2_hash_async_digest(struct ahash_request *req)
{
        struct n2_ahash_alg *n2alg = n2_ahash_alg(req->base.tfm);
        struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
        int ds;

        ds = n2alg->digest_size;
        if (unlikely(req->nbytes == 0)) {
                memcpy(req->result, n2alg->hash_zero, ds);
                return 0;
        }
        memcpy(&rctx->u, n2alg->hash_init, n2alg->hw_op_hashsz);

        return n2_do_async_digest(req, n2alg->auth_type,
                                  n2alg->hw_op_hashsz, ds,
                                  &rctx->u, 0UL, 0);
}

static int n2_hmac_async_digest(struct ahash_request *req)
{
        struct n2_hmac_alg *n2alg = n2_hmac_alg(req->base.tfm);
        struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
        struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
        struct n2_hmac_ctx *ctx = crypto_ahash_ctx(tfm);
        int ds;

        ds = n2alg->derived.digest_size;
        if (unlikely(req->nbytes == 0) ||
            unlikely(ctx->hash_key_len > N2_HASH_KEY_MAX)) {
                struct n2_hash_req_ctx *rctx = ahash_request_ctx(req);
                struct n2_hash_ctx *ctx = crypto_ahash_ctx(tfm);

                ahash_request_set_tfm(&rctx->fallback_req, ctx->fallback_tfm);
                rctx->fallback_req.base.flags =
                        req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP;
                rctx->fallback_req.nbytes = req->nbytes;
                rctx->fallback_req.src = req->src;
                rctx->fallback_req.result = req->result;

                return crypto_ahash_digest(&rctx->fallback_req);
        }
        memcpy(&rctx->u, n2alg->derived.hash_init,
               n2alg->derived.hw_op_hashsz);

        return n2_do_async_digest(req, n2alg->derived.hmac_type,
                                  n2alg->derived.hw_op_hashsz, ds,
                                  &rctx->u,
                                  __pa(&ctx->hash_key),
                                  ctx->hash_key_len);
}

struct n2_skcipher_context {
        int                     key_len;
        int                     enc_type;
        union {
                u8              aes[AES_MAX_KEY_SIZE];
                u8              des[DES_KEY_SIZE];
                u8              des3[3 * DES_KEY_SIZE];
                u8              arc4[258]; /* S-box, X, Y */
        } key;
};

#define N2_CHUNK_ARR_LEN        16

struct n2_crypto_chunk {
        struct list_head        entry;
        unsigned long           iv_paddr : 44;
        unsigned long           arr_len : 20;
        unsigned long           dest_paddr;
        unsigned long           dest_final;
        struct {
                unsigned long   src_paddr : 44;
                unsigned long   src_len : 20;
        } arr[N2_CHUNK_ARR_LEN];
};

struct n2_request_context {
        struct skcipher_walk    walk;
        struct list_head        chunk_list;
        struct n2_crypto_chunk  chunk;
        u8                      temp_iv[16];
};

/* The SPU allows some level of flexibility for partial cipher blocks
 * being specified in a descriptor.
 *
 * It merely requires that every descriptor's length field is at least
 * as large as the cipher block size.  This means that a cipher block
 * can span at most 2 descriptors.  However, this does not allow a
 * partial block to span into the final descriptor as that would
 * violate the rule (since every descriptor's length must be at lest
 * the block size).  So, for example, assuming an 8 byte block size:
 *
 *      0xe --> 0xa --> 0x8
 *
 * is a valid length sequence, whereas:
 *
 *      0xe --> 0xb --> 0x7
 *
 * is not a valid sequence.
 */

struct n2_skcipher_alg {
        struct list_head        entry;
        u8                      enc_type;
        struct skcipher_alg     skcipher;
};

static inline struct n2_skcipher_alg *n2_skcipher_alg(struct crypto_skcipher *tfm)
{
        struct skcipher_alg *alg = crypto_skcipher_alg(tfm);

        return container_of(alg, struct n2_skcipher_alg, skcipher);
}

struct n2_skcipher_request_context {
        struct skcipher_walk    walk;
};

static int n2_aes_setkey(struct crypto_skcipher *skcipher, const u8 *key,
                         unsigned int keylen)
{
        struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
        struct n2_skcipher_context *ctx = crypto_tfm_ctx(tfm);
        struct n2_skcipher_alg *n2alg = n2_skcipher_alg(skcipher);

        ctx->enc_type = (n2alg->enc_type & ENC_TYPE_CHAINING_MASK);

        switch (keylen) {
        case AES_KEYSIZE_128:
                ctx->enc_type |= ENC_TYPE_ALG_AES128;
                break;
        case AES_KEYSIZE_192:
                ctx->enc_type |= ENC_TYPE_ALG_AES192;
                break;
        case AES_KEYSIZE_256:
                ctx->enc_type |= ENC_TYPE_ALG_AES256;
                break;
        default:
                return -EINVAL;
        }

        ctx->key_len = keylen;
        memcpy(ctx->key.aes, key, keylen);
        return 0;
}

static int n2_des_setkey(struct crypto_skcipher *skcipher, const u8 *key,
                         unsigned int keylen)
{
        struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
        struct n2_skcipher_context *ctx = crypto_tfm_ctx(tfm);
        struct n2_skcipher_alg *n2alg = n2_skcipher_alg(skcipher);
        int err;

        err = verify_skcipher_des_key(skcipher, key);
        if (err)
                return err;

        ctx->enc_type = n2alg->enc_type;

        ctx->key_len = keylen;
        memcpy(ctx->key.des, key, keylen);
        return 0;
}

static int n2_3des_setkey(struct crypto_skcipher *skcipher, const u8 *key,
                          unsigned int keylen)
{
        struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
        struct n2_skcipher_context *ctx = crypto_tfm_ctx(tfm);
        struct n2_skcipher_alg *n2alg = n2_skcipher_alg(skcipher);
        int err;

        err = verify_skcipher_des3_key(skcipher, key);
        if (err)
                return err;

        ctx->enc_type = n2alg->enc_type;

        ctx->key_len = keylen;
        memcpy(ctx->key.des3, key, keylen);
        return 0;
}

static int n2_arc4_setkey(struct crypto_skcipher *skcipher, const u8 *key,
                          unsigned int keylen)
{
        struct crypto_tfm *tfm = crypto_skcipher_tfm(skcipher);
        struct n2_skcipher_context *ctx = crypto_tfm_ctx(tfm);
        struct n2_skcipher_alg *n2alg = n2_skcipher_alg(skcipher);
        u8 *s = ctx->key.arc4;
        u8 *x = s + 256;
        u8 *y = x + 1;
        int i, j, k;

        ctx->enc_type = n2alg->enc_type;

        j = k = 0;
        *x = 0;
        *y = 0;
        for (i = 0; i < 256; i++)
                s[i] = i;
        for (i = 0; i < 256; i++) {
                u8 a = s[i];
                j = (j + key[k] + a) & 0xff;
                s[i] = s[j];
                s[j] = a;
                if (++k >= keylen)
                        k = 0;
        }

        return 0;
}

static inline int skcipher_descriptor_len(int nbytes, unsigned int block_size)
{
        int this_len = nbytes;

        this_len -= (nbytes & (block_size - 1));
        return this_len > (1 << 16) ? (1 << 16) : this_len;
}

static int __n2_crypt_chunk(struct crypto_skcipher *skcipher,
                            struct n2_crypto_chunk *cp,
                            struct spu_queue *qp, bool encrypt)
{
        struct n2_skcipher_context *ctx = crypto_skcipher_ctx(skcipher);
        struct cwq_initial_entry *ent;
        bool in_place;
        int i;

        ent = spu_queue_alloc(qp, cp->arr_len);
        if (!ent) {
                pr_info("queue_alloc() of %d fails\n",
                        cp->arr_len);
                return -EBUSY;
        }

        in_place = (cp->dest_paddr == cp->arr[0].src_paddr);

        ent->control = control_word_base(cp->arr[0].src_len,
                                         0, ctx->enc_type, 0, 0,
                                         false, true, false, encrypt,
                                         OPCODE_ENCRYPT |
                                         (in_place ? OPCODE_INPLACE_BIT : 0));
        ent->src_addr = cp->arr[0].src_paddr;
        ent->auth_key_addr = 0UL;
        ent->auth_iv_addr = 0UL;
        ent->final_auth_state_addr = 0UL;
        ent->enc_key_addr = __pa(&ctx->key);
        ent->enc_iv_addr = cp->iv_paddr;
        ent->dest_addr = (in_place ? 0UL : cp->dest_paddr);

        for (i = 1; i < cp->arr_len; i++) {
                ent = spu_queue_next(qp, ent);

                ent->control = cp->arr[i].src_len - 1;
                ent->src_addr = cp->arr[i].src_paddr;
                ent->auth_key_addr = 0UL;
                ent->auth_iv_addr = 0UL;
                ent->final_auth_state_addr = 0UL;
                ent->enc_key_addr = 0UL;
                ent->enc_iv_addr = 0UL;
                ent->dest_addr = 0UL;
        }
        ent->control |= CONTROL_END_OF_BLOCK;

        return (spu_queue_submit(qp, ent) != HV_EOK) ? -EINVAL : 0;
}

static int n2_compute_chunks(struct skcipher_request *req)
{
        struct n2_request_context *rctx = skcipher_request_ctx(req);
        struct skcipher_walk *walk = &rctx->walk;
        struct n2_crypto_chunk *chunk;
        unsigned long dest_prev;
        unsigned int tot_len;
        bool prev_in_place;
        int err, nbytes;

        err = skcipher_walk_async(walk, req);
        if (err)
                return err;

        INIT_LIST_HEAD(&rctx->chunk_list);

        chunk = &rctx->chunk;
        INIT_LIST_HEAD(&chunk->entry);

        chunk->iv_paddr = 0UL;
        chunk->arr_len = 0;
        chunk->dest_paddr = 0UL;

        prev_in_place = false;
        dest_prev = ~0UL;
        tot_len = 0;

        while ((nbytes = walk->nbytes) != 0) {
                unsigned long dest_paddr, src_paddr;
                bool in_place;
                int this_len;

                src_paddr = (page_to_phys(walk->src.phys.page) +
                             walk->src.phys.offset);
                dest_paddr = (page_to_phys(walk->dst.phys.page) +
                              walk->dst.phys.offset);
                in_place = (src_paddr == dest_paddr);
                this_len = skcipher_descriptor_len(nbytes, walk->blocksize);

                if (chunk->arr_len != 0) {
                        if (in_place != prev_in_place ||
                            (!prev_in_place &&
                             dest_paddr != dest_prev) ||
                            chunk->arr_len == N2_CHUNK_ARR_LEN ||
                            tot_len + this_len > (1 << 16)) {
                                chunk->dest_final = dest_prev;
                                list_add_tail(&chunk->entry,
                                              &rctx->chunk_list);
                                chunk = kzalloc(sizeof(*chunk), GFP_ATOMIC);
                                if (!chunk) {
                                        err = -ENOMEM;
                                        break;
                                }
                                INIT_LIST_HEAD(&chunk->entry);
                        }
                }
                if (chunk->arr_len == 0) {
                        chunk->dest_paddr = dest_paddr;
                        tot_len = 0;
                }
                chunk->arr[chunk->arr_len].src_paddr = src_paddr;
                chunk->arr[chunk->arr_len].src_len = this_len;
                chunk->arr_len++;

                dest_prev = dest_paddr + this_len;
                prev_in_place = in_place;
                tot_len += this_len;

                err = skcipher_walk_done(walk, nbytes - this_len);
                if (err)
                        break;
        }
        if (!err && chunk->arr_len != 0) {
                chunk->dest_final = dest_prev;
                list_add_tail(&chunk->entry, &rctx->chunk_list);
        }

        return err;
}

static void n2_chunk_complete(struct skcipher_request *req, void *final_iv)
{
        struct n2_request_context *rctx = skcipher_request_ctx(req);
        struct n2_crypto_chunk *c, *tmp;

        if (final_iv)
                memcpy(rctx->walk.iv, final_iv, rctx->walk.blocksize);

        list_for_each_entry_safe(c, tmp, &rctx->chunk_list, entry) {
                list_del(&c->entry);
                if (unlikely(c != &rctx->chunk))
                        kfree(c);
        }

}

static int n2_do_ecb(struct skcipher_request *req, bool encrypt)
{
        struct n2_request_context *rctx = skcipher_request_ctx(req);
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        int err = n2_compute_chunks(req);
        struct n2_crypto_chunk *c, *tmp;
        unsigned long flags, hv_ret;
        struct spu_queue *qp;

        if (err)
                return err;

        qp = cpu_to_cwq[get_cpu()];
        err = -ENODEV;
        if (!qp)
                goto out;

        spin_lock_irqsave(&qp->lock, flags);

        list_for_each_entry_safe(c, tmp, &rctx->chunk_list, entry) {
                err = __n2_crypt_chunk(tfm, c, qp, encrypt);
                if (err)
                        break;
                list_del(&c->entry);
                if (unlikely(c != &rctx->chunk))
                        kfree(c);
        }
        if (!err) {
                hv_ret = wait_for_tail(qp);
                if (hv_ret != HV_EOK)
                        err = -EINVAL;
        }

        spin_unlock_irqrestore(&qp->lock, flags);

out:
        put_cpu();

        n2_chunk_complete(req, NULL);
        return err;
}

static int n2_encrypt_ecb(struct skcipher_request *req)
{
        return n2_do_ecb(req, true);
}

static int n2_decrypt_ecb(struct skcipher_request *req)
{
        return n2_do_ecb(req, false);
}

static int n2_do_chaining(struct skcipher_request *req, bool encrypt)
{
        struct n2_request_context *rctx = skcipher_request_ctx(req);
        struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
        unsigned long flags, hv_ret, iv_paddr;
        int err = n2_compute_chunks(req);
        struct n2_crypto_chunk *c, *tmp;
        struct spu_queue *qp;
        void *final_iv_addr;

        final_iv_addr = NULL;

        if (err)
                return err;

        qp = cpu_to_cwq[get_cpu()];
        err = -ENODEV;
        if (!qp)
                goto out;

        spin_lock_irqsave(&qp->lock, flags);

        if (encrypt) {
                iv_paddr = __pa(rctx->walk.iv);
                list_for_each_entry_safe(c, tmp, &rctx->chunk_list,
                                         entry) {
                        c->iv_paddr = iv_paddr;
                        err = __n2_crypt_chunk(tfm, c, qp, true);
                        if (err)
                                break;
                        iv_paddr = c->dest_final - rctx->walk.blocksize;
                        list_del(&c->entry);
                        if (unlikely(c != &rctx->chunk))
                                kfree(c);
                }
                final_iv_addr = __va(iv_paddr);
        } else {
                list_for_each_entry_safe_reverse(c, tmp, &rctx->chunk_list,
                                                 entry) {
                        if (c == &rctx->chunk) {
                                iv_paddr = __pa(rctx->walk.iv);
                        } else {
                                iv_paddr = (tmp->arr[tmp->arr_len-1].src_paddr +
                                            tmp->arr[tmp->arr_len-1].src_len -
                                            rctx->walk.blocksize);
                        }
                        if (!final_iv_addr) {
                                unsigned long pa;

                                pa = (c->arr[c->arr_len-1].src_paddr +
                                      c->arr[c->arr_len-1].src_len -
                                      rctx->walk.blocksize);
                                final_iv_addr = rctx->temp_iv;
                                memcpy(rctx->temp_iv, __va(pa),
                                       rctx->walk.blocksize);
                        }
                        c->iv_paddr = iv_paddr;
                        err = __n2_crypt_chunk(tfm, c, qp, false);
                        if (err)
                                break;
                        list_del(&c->entry);
                        if (unlikely(c != &rctx->chunk))
                                kfree(c);
                }
        }
        if (!err) {
                hv_ret = wait_for_tail(qp);
                if (hv_ret != HV_EOK)
                        err = -EINVAL;
        }

        spin_unlock_irqrestore(&qp->lock, flags);

out:
        put_cpu();

        n2_chunk_complete(req, err ? NULL : final_iv_addr);
        return err;
}

static int n2_encrypt_chaining(struct skcipher_request *req)
{
        return n2_do_chaining(req, true);
}

static int n2_decrypt_chaining(struct skcipher_request *req)
{
        return n2_do_chaining(req, false);
}

struct n2_skcipher_tmpl {
        const char              *name;
        const char              *drv_name;
        u8                      block_size;
        u8                      enc_type;
        struct skcipher_alg     skcipher;
};

static const struct n2_skcipher_tmpl skcipher_tmpls[] = {
        /* ARC4: only ECB is supported (chaining bits ignored) */
        {       .name           = "ecb(arc4)",
                .drv_name       = "ecb-arc4",
                .block_size     = 1,
                .enc_type       = (ENC_TYPE_ALG_RC4_STREAM |
                                   ENC_TYPE_CHAINING_ECB),
                .skcipher       = {
                        .min_keysize    = 1,
                        .max_keysize    = 256,
                        .setkey         = n2_arc4_setkey,
                        .encrypt        = n2_encrypt_ecb,
                        .decrypt        = n2_decrypt_ecb,
                },
        },

        /* DES: ECB CBC and CFB are supported */
        {       .name           = "ecb(des)",
                .drv_name       = "ecb-des",
                .block_size     = DES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_DES |
                                   ENC_TYPE_CHAINING_ECB),
                .skcipher       = {
                        .min_keysize    = DES_KEY_SIZE,
                        .max_keysize    = DES_KEY_SIZE,
                        .setkey         = n2_des_setkey,
                        .encrypt        = n2_encrypt_ecb,
                        .decrypt        = n2_decrypt_ecb,
                },
        },
        {       .name           = "cbc(des)",
                .drv_name       = "cbc-des",
                .block_size     = DES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_DES |
                                   ENC_TYPE_CHAINING_CBC),
                .skcipher       = {
                        .ivsize         = DES_BLOCK_SIZE,
                        .min_keysize    = DES_KEY_SIZE,
                        .max_keysize    = DES_KEY_SIZE,
                        .setkey         = n2_des_setkey,
                        .encrypt        = n2_encrypt_chaining,
                        .decrypt        = n2_decrypt_chaining,
                },
        },
        {       .name           = "cfb(des)",
                .drv_name       = "cfb-des",
                .block_size     = DES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_DES |
                                   ENC_TYPE_CHAINING_CFB),
                .skcipher       = {
                        .min_keysize    = DES_KEY_SIZE,
                        .max_keysize    = DES_KEY_SIZE,
                        .setkey         = n2_des_setkey,
                        .encrypt        = n2_encrypt_chaining,
                        .decrypt        = n2_decrypt_chaining,
                },
        },

        /* 3DES: ECB CBC and CFB are supported */
        {       .name           = "ecb(des3_ede)",
                .drv_name       = "ecb-3des",
                .block_size     = DES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_3DES |
                                   ENC_TYPE_CHAINING_ECB),
                .skcipher       = {
                        .min_keysize    = 3 * DES_KEY_SIZE,
                        .max_keysize    = 3 * DES_KEY_SIZE,
                        .setkey         = n2_3des_setkey,
                        .encrypt        = n2_encrypt_ecb,
                        .decrypt        = n2_decrypt_ecb,
                },
        },
        {       .name           = "cbc(des3_ede)",
                .drv_name       = "cbc-3des",
                .block_size     = DES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_3DES |
                                   ENC_TYPE_CHAINING_CBC),
                .skcipher       = {
                        .ivsize         = DES_BLOCK_SIZE,
                        .min_keysize    = 3 * DES_KEY_SIZE,
                        .max_keysize    = 3 * DES_KEY_SIZE,
                        .setkey         = n2_3des_setkey,
                        .encrypt        = n2_encrypt_chaining,
                        .decrypt        = n2_decrypt_chaining,
                },
        },
        {       .name           = "cfb(des3_ede)",
                .drv_name       = "cfb-3des",
                .block_size     = DES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_3DES |
                                   ENC_TYPE_CHAINING_CFB),
                .skcipher       = {
                        .min_keysize    = 3 * DES_KEY_SIZE,
                        .max_keysize    = 3 * DES_KEY_SIZE,
                        .setkey         = n2_3des_setkey,
                        .encrypt        = n2_encrypt_chaining,
                        .decrypt        = n2_decrypt_chaining,
                },
        },
        /* AES: ECB CBC and CTR are supported */
        {       .name           = "ecb(aes)",
                .drv_name       = "ecb-aes",
                .block_size     = AES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_AES128 |
                                   ENC_TYPE_CHAINING_ECB),
                .skcipher       = {
                        .min_keysize    = AES_MIN_KEY_SIZE,
                        .max_keysize    = AES_MAX_KEY_SIZE,
                        .setkey         = n2_aes_setkey,
                        .encrypt        = n2_encrypt_ecb,
                        .decrypt        = n2_decrypt_ecb,
                },
        },
        {       .name           = "cbc(aes)",
                .drv_name       = "cbc-aes",
                .block_size     = AES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_AES128 |
                                   ENC_TYPE_CHAINING_CBC),
                .skcipher       = {
                        .ivsize         = AES_BLOCK_SIZE,
                        .min_keysize    = AES_MIN_KEY_SIZE,
                        .max_keysize    = AES_MAX_KEY_SIZE,
                        .setkey         = n2_aes_setkey,
                        .encrypt        = n2_encrypt_chaining,
                        .decrypt        = n2_decrypt_chaining,
                },
        },
        {       .name           = "ctr(aes)",
                .drv_name       = "ctr-aes",
                .block_size     = AES_BLOCK_SIZE,
                .enc_type       = (ENC_TYPE_ALG_AES128 |
                                   ENC_TYPE_CHAINING_COUNTER),
                .skcipher       = {
                        .ivsize         = AES_BLOCK_SIZE,
                        .min_keysize    = AES_MIN_KEY_SIZE,
                        .max_keysize    = AES_MAX_KEY_SIZE,
                        .setkey         = n2_aes_setkey,
                        .encrypt        = n2_encrypt_chaining,
                        .decrypt        = n2_encrypt_chaining,
                },
        },

};
#define NUM_CIPHER_TMPLS ARRAY_SIZE(skcipher_tmpls)

static LIST_HEAD(skcipher_algs);

struct n2_hash_tmpl {
        const char      *name;
        const u8        *hash_zero;
        const u32       *hash_init;
        u8              hw_op_hashsz;
        u8              digest_size;
        u8              block_size;
        u8              auth_type;
        u8              hmac_type;
};

static const u32 n2_md5_init[MD5_HASH_WORDS] = {
        cpu_to_le32(MD5_H0),
        cpu_to_le32(MD5_H1),
        cpu_to_le32(MD5_H2),
        cpu_to_le32(MD5_H3),
};
static const u32 n2_sha1_init[SHA1_DIGEST_SIZE / 4] = {
        SHA1_H0, SHA1_H1, SHA1_H2, SHA1_H3, SHA1_H4,
};
static const u32 n2_sha256_init[SHA256_DIGEST_SIZE / 4] = {
        SHA256_H0, SHA256_H1, SHA256_H2, SHA256_H3,
        SHA256_H4, SHA256_H5, SHA256_H6, SHA256_H7,
};
static const u32 n2_sha224_init[SHA256_DIGEST_SIZE / 4] = {
        SHA224_H0, SHA224_H1, SHA224_H2, SHA224_H3,
        SHA224_H4, SHA224_H5, SHA224_H6, SHA224_H7,
};

static const struct n2_hash_tmpl hash_tmpls[] = {
        { .name         = "md5",
          .hash_zero    = md5_zero_message_hash,
          .hash_init    = n2_md5_init,
          .auth_type    = AUTH_TYPE_MD5,
          .hmac_type    = AUTH_TYPE_HMAC_MD5,
          .hw_op_hashsz = MD5_DIGEST_SIZE,
          .digest_size  = MD5_DIGEST_SIZE,
          .block_size   = MD5_HMAC_BLOCK_SIZE },
        { .name         = "sha1",
          .hash_zero    = sha1_zero_message_hash,
          .hash_init    = n2_sha1_init,
          .auth_type    = AUTH_TYPE_SHA1,
          .hmac_type    = AUTH_TYPE_HMAC_SHA1,
          .hw_op_hashsz = SHA1_DIGEST_SIZE,
          .digest_size  = SHA1_DIGEST_SIZE,
          .block_size   = SHA1_BLOCK_SIZE },
        { .name         = "sha256",
          .hash_zero    = sha256_zero_message_hash,
          .hash_init    = n2_sha256_init,
          .auth_type    = AUTH_TYPE_SHA256,
          .hmac_type    = AUTH_TYPE_HMAC_SHA256,
          .hw_op_hashsz = SHA256_DIGEST_SIZE,
          .digest_size  = SHA256_DIGEST_SIZE,
          .block_size   = SHA256_BLOCK_SIZE },
        { .name         = "sha224",
          .hash_zero    = sha224_zero_message_hash,
          .hash_init    = n2_sha224_init,
          .auth_type    = AUTH_TYPE_SHA256,
          .hmac_type    = AUTH_TYPE_RESERVED,
          .hw_op_hashsz = SHA256_DIGEST_SIZE,
          .digest_size  = SHA224_DIGEST_SIZE,
          .block_size   = SHA224_BLOCK_SIZE },
};
#define NUM_HASH_TMPLS ARRAY_SIZE(hash_tmpls)

static LIST_HEAD(ahash_algs);
static LIST_HEAD(hmac_algs);

static int algs_registered;

static void __n2_unregister_algs(void)
{
        struct n2_skcipher_alg *skcipher, *skcipher_tmp;
        struct n2_ahash_alg *alg, *alg_tmp;
        struct n2_hmac_alg *hmac, *hmac_tmp;

        list_for_each_entry_safe(skcipher, skcipher_tmp, &skcipher_algs, entry) {
                crypto_unregister_skcipher(&skcipher->skcipher);
                list_del(&skcipher->entry);
                kfree(skcipher);
        }
        list_for_each_entry_safe(hmac, hmac_tmp, &hmac_algs, derived.entry) {
                crypto_unregister_ahash(&hmac->derived.alg);
                list_del(&hmac->derived.entry);
                kfree(hmac);
        }
        list_for_each_entry_safe(alg, alg_tmp, &ahash_algs, entry) {
                crypto_unregister_ahash(&alg->alg);
                list_del(&alg->entry);
                kfree(alg);
        }
}

static int n2_skcipher_init_tfm(struct crypto_skcipher *tfm)
{
        crypto_skcipher_set_reqsize(tfm, sizeof(struct n2_request_context));
        return 0;
}

static int __n2_register_one_skcipher(const struct n2_skcipher_tmpl *tmpl)
{
        struct n2_skcipher_alg *p = kzalloc(sizeof(*p), GFP_KERNEL);
        struct skcipher_alg *alg;
        int err;

        if (!p)
                return -ENOMEM;

        alg = &p->skcipher;
        *alg = tmpl->skcipher;

        snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", tmpl->name);
        snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s-n2", tmpl->drv_name);
        alg->base.cra_priority = N2_CRA_PRIORITY;
        alg->base.cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY | CRYPTO_ALG_ASYNC |
                              CRYPTO_ALG_ALLOCATES_MEMORY;
        alg->base.cra_blocksize = tmpl->block_size;
        p->enc_type = tmpl->enc_type;
        alg->base.cra_ctxsize = sizeof(struct n2_skcipher_context);
        alg->base.cra_module = THIS_MODULE;
        alg->init = n2_skcipher_init_tfm;

        list_add(&p->entry, &skcipher_algs);
        err = crypto_register_skcipher(alg);
        if (err) {
                pr_err("%s alg registration failed\n", alg->base.cra_name);
                list_del(&p->entry);
                kfree(p);
        } else {
                pr_info("%s alg registered\n", alg->base.cra_name);
        }
        return err;
}

static int __n2_register_one_hmac(struct n2_ahash_alg *n2ahash)
{
        struct n2_hmac_alg *p = kzalloc(sizeof(*p), GFP_KERNEL);
        struct ahash_alg *ahash;
        struct crypto_alg *base;
        int err;

        if (!p)
                return -ENOMEM;

        p->child_alg = n2ahash->alg.halg.base.cra_name;
        memcpy(&p->derived, n2ahash, sizeof(struct n2_ahash_alg));
        INIT_LIST_HEAD(&p->derived.entry);

        ahash = &p->derived.alg;
        ahash->digest = n2_hmac_async_digest;
        ahash->setkey = n2_hmac_async_setkey;

        base = &ahash->halg.base;
        snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)", p->child_alg);
        snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "hmac-%s-n2", p->child_alg);

        base->cra_ctxsize = sizeof(struct n2_hmac_ctx);
        base->cra_init = n2_hmac_cra_init;
        base->cra_exit = n2_hmac_cra_exit;

        list_add(&p->derived.entry, &hmac_algs);
        err = crypto_register_ahash(ahash);
        if (err) {
                pr_err("%s alg registration failed\n", base->cra_name);
                list_del(&p->derived.entry);
                kfree(p);
        } else {
                pr_info("%s alg registered\n", base->cra_name);
        }
        return err;
}

static int __n2_register_one_ahash(const struct n2_hash_tmpl *tmpl)
{
        struct n2_ahash_alg *p = kzalloc(sizeof(*p), GFP_KERNEL);
        struct hash_alg_common *halg;
        struct crypto_alg *base;
        struct ahash_alg *ahash;
        int err;

        if (!p)
                return -ENOMEM;

        p->hash_zero = tmpl->hash_zero;
        p->hash_init = tmpl->hash_init;
        p->auth_type = tmpl->auth_type;
        p->hmac_type = tmpl->hmac_type;
        p->hw_op_hashsz = tmpl->hw_op_hashsz;
        p->digest_size = tmpl->digest_size;

        ahash = &p->alg;
        ahash->init = n2_hash_async_init;
        ahash->update = n2_hash_async_update;
        ahash->final = n2_hash_async_final;
        ahash->finup = n2_hash_async_finup;
        ahash->digest = n2_hash_async_digest;
        ahash->export = n2_hash_async_noexport;
        ahash->import = n2_hash_async_noimport;

        halg = &ahash->halg;
        halg->digestsize = tmpl->digest_size;

        base = &halg->base;
        snprintf(base->cra_name, CRYPTO_MAX_ALG_NAME, "%s", tmpl->name);
        snprintf(base->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s-n2", tmpl->name);
        base->cra_priority = N2_CRA_PRIORITY;
        base->cra_flags = CRYPTO_ALG_KERN_DRIVER_ONLY |
                          CRYPTO_ALG_NEED_FALLBACK;
        base->cra_blocksize = tmpl->block_size;
        base->cra_ctxsize = sizeof(struct n2_hash_ctx);
        base->cra_module = THIS_MODULE;
        base->cra_init = n2_hash_cra_init;
        base->cra_exit = n2_hash_cra_exit;

        list_add(&p->entry, &ahash_algs);
        err = crypto_register_ahash(ahash);
        if (err) {
                pr_err("%s alg registration failed\n", base->cra_name);
                list_del(&p->entry);
                kfree(p);
        } else {
                pr_info("%s alg registered\n", base->cra_name);
        }
        if (!err && p->hmac_type != AUTH_TYPE_RESERVED)
                err = __n2_register_one_hmac(p);
        return err;
}

static int n2_register_algs(void)
{
        int i, err = 0;

        mutex_lock(&spu_lock);
        if (algs_registered++)
                goto out;

        for (i = 0; i < NUM_HASH_TMPLS; i++) {
                err = __n2_register_one_ahash(&hash_tmpls[i]);
                if (err) {
                        __n2_unregister_algs();
                        goto out;
                }
        }
        for (i = 0; i < NUM_CIPHER_TMPLS; i++) {
                err = __n2_register_one_skcipher(&skcipher_tmpls[i]);
                if (err) {
                        __n2_unregister_algs();
                        goto out;
                }
        }

out:
        mutex_unlock(&spu_lock);
        return err;
}

static void n2_unregister_algs(void)
{
        mutex_lock(&spu_lock);
        if (!--algs_registered)
                __n2_unregister_algs();
        mutex_unlock(&spu_lock);
}

/* To map CWQ queues to interrupt sources, the hypervisor API provides
 * a devino.  This isn't very useful to us because all of the
 * interrupts listed in the device_node have been translated to
 * Linux virtual IRQ cookie numbers.
 *
 * So we have to back-translate, going through the 'intr' and 'ino'
 * property tables of the n2cp MDESC node, matching it with the OF
 * 'interrupts' property entries, in order to to figure out which
 * devino goes to which already-translated IRQ.
 */
static int find_devino_index(struct platform_device *dev, struct spu_mdesc_info *ip,
                             unsigned long dev_ino)
{
        const unsigned int *dev_intrs;
        unsigned int intr;
        int i;

        for (i = 0; i < ip->num_intrs; i++) {
                if (ip->ino_table[i].ino == dev_ino)
                        break;
        }
        if (i == ip->num_intrs)
                return -ENODEV;

        intr = ip->ino_table[i].intr;

        dev_intrs = of_get_property(dev->dev.of_node, "interrupts", NULL);
        if (!dev_intrs)
                return -ENODEV;

        for (i = 0; i < dev->archdata.num_irqs; i++) {
                if (dev_intrs[i] == intr)
                        return i;
        }

        return -ENODEV;
}

static int spu_map_ino(struct platform_device *dev, struct spu_mdesc_info *ip,
                       const char *irq_name, struct spu_queue *p,
                       irq_handler_t handler)
{
        unsigned long herr;
        int index;

        herr = sun4v_ncs_qhandle_to_devino(p->qhandle, &p->devino);
        if (herr)
                return -EINVAL;

        index = find_devino_index(dev, ip, p->devino);
        if (index < 0)
                return index;

        p->irq = dev->archdata.irqs[index];

        sprintf(p->irq_name, "%s-%d", irq_name, index);

        return request_irq(p->irq, handler, 0, p->irq_name, p);
}

static struct kmem_cache *queue_cache[2];

static void *new_queue(unsigned long q_type)
{
        return kmem_cache_zalloc(queue_cache[q_type - 1], GFP_KERNEL);
}

static void free_queue(void *p, unsigned long q_type)
{
        kmem_cache_free(queue_cache[q_type - 1], p);
}

static int queue_cache_init(void)
{
        if (!queue_cache[HV_NCS_QTYPE_MAU - 1])
                queue_cache[HV_NCS_QTYPE_MAU - 1] =
                        kmem_cache_create("mau_queue",
                                          (MAU_NUM_ENTRIES *
                                           MAU_ENTRY_SIZE),
                                          MAU_ENTRY_SIZE, 0, NULL);
        if (!queue_cache[HV_NCS_QTYPE_MAU - 1])
                return -ENOMEM;

        if (!queue_cache[HV_NCS_QTYPE_CWQ - 1])
                queue_cache[HV_NCS_QTYPE_CWQ - 1] =
                        kmem_cache_create("cwq_queue",
                                          (CWQ_NUM_ENTRIES *
                                           CWQ_ENTRY_SIZE),
                                          CWQ_ENTRY_SIZE, 0, NULL);
        if (!queue_cache[HV_NCS_QTYPE_CWQ - 1]) {
                kmem_cache_destroy(queue_cache[HV_NCS_QTYPE_MAU - 1]);
                queue_cache[HV_NCS_QTYPE_MAU - 1] = NULL;
                return -ENOMEM;
        }
        return 0;
}

static void queue_cache_destroy(void)
{
        kmem_cache_destroy(queue_cache[HV_NCS_QTYPE_MAU - 1]);
        kmem_cache_destroy(queue_cache[HV_NCS_QTYPE_CWQ - 1]);
        queue_cache[HV_NCS_QTYPE_MAU - 1] = NULL;
        queue_cache[HV_NCS_QTYPE_CWQ - 1] = NULL;
}

static long spu_queue_register_workfn(void *arg)
{
        struct spu_qreg *qr = arg;
        struct spu_queue *p = qr->queue;
        unsigned long q_type = qr->type;
        unsigned long hv_ret;

        hv_ret = sun4v_ncs_qconf(q_type, __pa(p->q),
                                 CWQ_NUM_ENTRIES, &p->qhandle);
        if (!hv_ret)
                sun4v_ncs_sethead_marker(p->qhandle, 0);

        return hv_ret ? -EINVAL : 0;
}

static int spu_queue_register(struct spu_queue *p, unsigned long q_type)
{
        int cpu = cpumask_any_and(&p->sharing, cpu_online_mask);
        struct spu_qreg qr = { .queue = p, .type = q_type };

        return work_on_cpu_safe(cpu, spu_queue_register_workfn, &qr);
}

static int spu_queue_setup(struct spu_queue *p)
{
        int err;

        p->q = new_queue(p->q_type);
        if (!p->q)
                return -ENOMEM;

        err = spu_queue_register(p, p->q_type);
        if (err) {
                free_queue(p->q, p->q_type);
                p->q = NULL;
        }

        return err;
}

static void spu_queue_destroy(struct spu_queue *p)
{
        unsigned long hv_ret;

        if (!p->q)
                return;

        hv_ret = sun4v_ncs_qconf(p->q_type, p->qhandle, 0, &p->qhandle);

        if (!hv_ret)
                free_queue(p->q, p->q_type);
}

static void spu_list_destroy(struct list_head *list)
{
        struct spu_queue *p, *n;

        list_for_each_entry_safe(p, n, list, list) {
                int i;

                for (i = 0; i < NR_CPUS; i++) {
                        if (cpu_to_cwq[i] == p)
                                cpu_to_cwq[i] = NULL;
                }

                if (p->irq) {
                        free_irq(p->irq, p);
                        p->irq = 0;
                }
                spu_queue_destroy(p);
                list_del(&p->list);
                kfree(p);
        }
}

/* Walk the backward arcs of a CWQ 'exec-unit' node,
 * gathering cpu membership information.
 */
static int spu_mdesc_walk_arcs(struct mdesc_handle *mdesc,
                               struct platform_device *dev,
                               u64 node, struct spu_queue *p,
                               struct spu_queue **table)
{
        u64 arc;

        mdesc_for_each_arc(arc, mdesc, node, MDESC_ARC_TYPE_BACK) {
                u64 tgt = mdesc_arc_target(mdesc, arc);
                const char *name = mdesc_node_name(mdesc, tgt);
                const u64 *id;

                if (strcmp(name, "cpu"))
                        continue;
                id = mdesc_get_property(mdesc, tgt, "id", NULL);
                if (table[*id] != NULL) {
                        dev_err(&dev->dev, "%pOF: SPU cpu slot already set.\n",
                                dev->dev.of_node);
                        return -EINVAL;
                }
                cpumask_set_cpu(*id, &p->sharing);
                table[*id] = p;
        }
        return 0;
}

/* Process an 'exec-unit' MDESC node of type 'cwq'.  */
static int handle_exec_unit(struct spu_mdesc_info *ip, struct list_head *list,
                            struct platform_device *dev, struct mdesc_handle *mdesc,
                            u64 node, const char *iname, unsigned long q_type,
                            irq_handler_t handler, struct spu_queue **table)
{
        struct spu_queue *p;
        int err;

        p = kzalloc(sizeof(struct spu_queue), GFP_KERNEL);
        if (!p) {
                dev_err(&dev->dev, "%pOF: Could not allocate SPU queue.\n",
                        dev->dev.of_node);
                return -ENOMEM;
        }

        cpumask_clear(&p->sharing);
        spin_lock_init(&p->lock);
        p->q_type = q_type;
        INIT_LIST_HEAD(&p->jobs);
        list_add(&p->list, list);

        err = spu_mdesc_walk_arcs(mdesc, dev, node, p, table);
        if (err)
                return err;

        err = spu_queue_setup(p);
        if (err)
                return err;

        return spu_map_ino(dev, ip, iname, p, handler);
}

static int spu_mdesc_scan(struct mdesc_handle *mdesc, struct platform_device *dev,
                          struct spu_mdesc_info *ip, struct list_head *list,
                          const char *exec_name, unsigned long q_type,
                          irq_handler_t handler, struct spu_queue **table)
{
        int err = 0;
        u64 node;

        mdesc_for_each_node_by_name(mdesc, node, "exec-unit") {
                const char *type;

                type = mdesc_get_property(mdesc, node, "type", NULL);
                if (!type || strcmp(type, exec_name))
                        continue;

                err = handle_exec_unit(ip, list, dev, mdesc, node,
                                       exec_name, q_type, handler, table);
                if (err) {
                        spu_list_destroy(list);
                        break;
                }
        }

        return err;
}

static int get_irq_props(struct mdesc_handle *mdesc, u64 node,
                         struct spu_mdesc_info *ip)
{
        const u64 *ino;
        int ino_len;
        int i;

        ino = mdesc_get_property(mdesc, node, "ino", &ino_len);
        if (!ino) {
                printk("NO 'ino'\n");
                return -ENODEV;
        }

        ip->num_intrs = ino_len / sizeof(u64);
        ip->ino_table = kzalloc((sizeof(struct ino_blob) *
                                 ip->num_intrs),
                                GFP_KERNEL);
        if (!ip->ino_table)
                return -ENOMEM;

        for (i = 0; i < ip->num_intrs; i++) {
                struct ino_blob *b = &ip->ino_table[i];
                b->intr = i + 1;
                b->ino = ino[i];
        }

        return 0;
}

static int grab_mdesc_irq_props(struct mdesc_handle *mdesc,
                                struct platform_device *dev,
                                struct spu_mdesc_info *ip,
                                const char *node_name)
{
        const unsigned int *reg;
        u64 node;

        reg = of_get_property(dev->dev.of_node, "reg", NULL);
        if (!reg)
                return -ENODEV;

        mdesc_for_each_node_by_name(mdesc, node, "virtual-device") {
                const char *name;
                const u64 *chdl;

                name = mdesc_get_property(mdesc, node, "name", NULL);
                if (!name || strcmp(name, node_name))
                        continue;
                chdl = mdesc_get_property(mdesc, node, "cfg-handle", NULL);
                if (!chdl || (*chdl != *reg))
                        continue;
                ip->cfg_handle = *chdl;
                return get_irq_props(mdesc, node, ip);
        }

        return -ENODEV;
}

static unsigned long n2_spu_hvapi_major;
static unsigned long n2_spu_hvapi_minor;

static int n2_spu_hvapi_register(void)
{
        int err;

        n2_spu_hvapi_major = 2;
        n2_spu_hvapi_minor = 0;

        err = sun4v_hvapi_register(HV_GRP_NCS,
                                   n2_spu_hvapi_major,
                                   &n2_spu_hvapi_minor);

        if (!err)
                pr_info("Registered NCS HVAPI version %lu.%lu\n",
                        n2_spu_hvapi_major,
                        n2_spu_hvapi_minor);

        return err;
}

static void n2_spu_hvapi_unregister(void)
{
        sun4v_hvapi_unregister(HV_GRP_NCS);
}

static int global_ref;

static int grab_global_resources(void)
{
        int err = 0;

        mutex_lock(&spu_lock);

        if (global_ref++)
                goto out;

        err = n2_spu_hvapi_register();
        if (err)
                goto out;

        err = queue_cache_init();
        if (err)
                goto out_hvapi_release;

        err = -ENOMEM;
        cpu_to_cwq = kcalloc(NR_CPUS, sizeof(struct spu_queue *),
                             GFP_KERNEL);
        if (!cpu_to_cwq)
                goto out_queue_cache_destroy;

        cpu_to_mau = kcalloc(NR_CPUS, sizeof(struct spu_queue *),
                             GFP_KERNEL);
        if (!cpu_to_mau)
                goto out_free_cwq_table;

        err = 0;

out:
        if (err)
                global_ref--;
        mutex_unlock(&spu_lock);
        return err;

out_free_cwq_table:
        kfree(cpu_to_cwq);
        cpu_to_cwq = NULL;

out_queue_cache_destroy:
        queue_cache_destroy();

out_hvapi_release:
        n2_spu_hvapi_unregister();
        goto out;
}

static void release_global_resources(void)
{
        mutex_lock(&spu_lock);
        if (!--global_ref) {
                kfree(cpu_to_cwq);
                cpu_to_cwq = NULL;

                kfree(cpu_to_mau);
                cpu_to_mau = NULL;

                queue_cache_destroy();
                n2_spu_hvapi_unregister();
        }
        mutex_unlock(&spu_lock);
}

static struct n2_crypto *alloc_n2cp(void)
{
        struct n2_crypto *np = kzalloc(sizeof(struct n2_crypto), GFP_KERNEL);

        if (np)
                INIT_LIST_HEAD(&np->cwq_list);

        return np;
}

static void free_n2cp(struct n2_crypto *np)
{
        kfree(np->cwq_info.ino_table);
        np->cwq_info.ino_table = NULL;

        kfree(np);
}

static void n2_spu_driver_version(void)
{
        static int n2_spu_version_printed;

        if (n2_spu_version_printed++ == 0)
                pr_info("%s", version);
}

static int n2_crypto_probe(struct platform_device *dev)
{
        struct mdesc_handle *mdesc;
        struct n2_crypto *np;
        int err;

        n2_spu_driver_version();

        pr_info("Found N2CP at %pOF\n", dev->dev.of_node);

        np = alloc_n2cp();
        if (!np) {
                dev_err(&dev->dev, "%pOF: Unable to allocate n2cp.\n",
                        dev->dev.of_node);
                return -ENOMEM;
        }

        err = grab_global_resources();
        if (err) {
                dev_err(&dev->dev, "%pOF: Unable to grab global resources.\n",
                        dev->dev.of_node);
                goto out_free_n2cp;
        }

        mdesc = mdesc_grab();

        if (!mdesc) {
                dev_err(&dev->dev, "%pOF: Unable to grab MDESC.\n",
                        dev->dev.of_node);
                err = -ENODEV;
                goto out_free_global;
        }
        err = grab_mdesc_irq_props(mdesc, dev, &np->cwq_info, "n2cp");
        if (err) {
                dev_err(&dev->dev, "%pOF: Unable to grab IRQ props.\n",
                        dev->dev.of_node);
                mdesc_release(mdesc);
                goto out_free_global;
        }

        err = spu_mdesc_scan(mdesc, dev, &np->cwq_info, &np->cwq_list,
                             "cwq", HV_NCS_QTYPE_CWQ, cwq_intr,
                             cpu_to_cwq);
        mdesc_release(mdesc);

        if (err) {
                dev_err(&dev->dev, "%pOF: CWQ MDESC scan failed.\n",
                        dev->dev.of_node);
                goto out_free_global;
        }

        err = n2_register_algs();
        if (err) {
                dev_err(&dev->dev, "%pOF: Unable to register algorithms.\n",
                        dev->dev.of_node);
                goto out_free_spu_list;
        }

        dev_set_drvdata(&dev->dev, np);

        return 0;

out_free_spu_list:
        spu_list_destroy(&np->cwq_list);

out_free_global:
        release_global_resources();

out_free_n2cp:
        free_n2cp(np);

        return err;
}

static int n2_crypto_remove(struct platform_device *dev)
{
        struct n2_crypto *np = dev_get_drvdata(&dev->dev);

        n2_unregister_algs();

        spu_list_destroy(&np->cwq_list);

        release_global_resources();

        free_n2cp(np);

        return 0;
}

static struct n2_mau *alloc_ncp(void)
{
        struct n2_mau *mp = kzalloc(sizeof(struct n2_mau), GFP_KERNEL);

        if (mp)
                INIT_LIST_HEAD(&mp->mau_list);

        return mp;
}

static void free_ncp(struct n2_mau *mp)
{
        kfree(mp->mau_info.ino_table);
        mp->mau_info.ino_table = NULL;

        kfree(mp);
}

static int n2_mau_probe(struct platform_device *dev)
{
        struct mdesc_handle *mdesc;
        struct n2_mau *mp;
        int err;

        n2_spu_driver_version();

        pr_info("Found NCP at %pOF\n", dev->dev.of_node);

        mp = alloc_ncp();
        if (!mp) {
                dev_err(&dev->dev, "%pOF: Unable to allocate ncp.\n",
                        dev->dev.of_node);
                return -ENOMEM;
        }

        err = grab_global_resources();
        if (err) {
                dev_err(&dev->dev, "%pOF: Unable to grab global resources.\n",
                        dev->dev.of_node);
                goto out_free_ncp;
        }

        mdesc = mdesc_grab();

        if (!mdesc) {
                dev_err(&dev->dev, "%pOF: Unable to grab MDESC.\n",
                        dev->dev.of_node);
                err = -ENODEV;
                goto out_free_global;
        }

        err = grab_mdesc_irq_props(mdesc, dev, &mp->mau_info, "ncp");
        if (err) {
                dev_err(&dev->dev, "%pOF: Unable to grab IRQ props.\n",
                        dev->dev.of_node);
                mdesc_release(mdesc);
                goto out_free_global;
        }

        err = spu_mdesc_scan(mdesc, dev, &mp->mau_info, &mp->mau_list,
                             "mau", HV_NCS_QTYPE_MAU, mau_intr,
                             cpu_to_mau);
        mdesc_release(mdesc);

        if (err) {
                dev_err(&dev->dev, "%pOF: MAU MDESC scan failed.\n",
                        dev->dev.of_node);
                goto out_free_global;
        }

        dev_set_drvdata(&dev->dev, mp);

        return 0;

out_free_global:
        release_global_resources();

out_free_ncp:
        free_ncp(mp);

        return err;
}

static int n2_mau_remove(struct platform_device *dev)
{
        struct n2_mau *mp = dev_get_drvdata(&dev->dev);

        spu_list_destroy(&mp->mau_list);

        release_global_resources();

        free_ncp(mp);

        return 0;
}

static const struct of_device_id n2_crypto_match[] = {
        {
                .name = "n2cp",
                .compatible = "SUNW,n2-cwq",
        },
        {
                .name = "n2cp",
                .compatible = "SUNW,vf-cwq",
        },
        {
                .name = "n2cp",
                .compatible = "SUNW,kt-cwq",
        },
        {},
};

MODULE_DEVICE_TABLE(of, n2_crypto_match);

static struct platform_driver n2_crypto_driver = {
        .driver = {
                .name           =       "n2cp",
                .of_match_table =       n2_crypto_match,
        },
        .probe          =       n2_crypto_probe,
        .remove         =       n2_crypto_remove,
};

static const struct of_device_id n2_mau_match[] = {
        {
                .name = "ncp",
                .compatible = "SUNW,n2-mau",
        },
        {
                .name = "ncp",
                .compatible = "SUNW,vf-mau",
        },
        {
                .name = "ncp",
                .compatible = "SUNW,kt-mau",
        },
        {},
};

MODULE_DEVICE_TABLE(of, n2_mau_match);

static struct platform_driver n2_mau_driver = {
        .driver = {
                .name           =       "ncp",
                .of_match_table =       n2_mau_match,
        },
        .probe          =       n2_mau_probe,
        .remove         =       n2_mau_remove,
};

static struct platform_driver * const drivers[] = {
        &n2_crypto_driver,
        &n2_mau_driver,
};

static int __init n2_init(void)
{
        return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
}

static void __exit n2_exit(void)
{
        platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
}

module_init(n2_init);
module_exit(n2_exit);