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Diffstat (limited to 'include/crypto/internal/acompress.h')
| -rw-r--r-- | include/crypto/internal/acompress.h | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/include/crypto/internal/acompress.h b/include/crypto/internal/acompress.h new file mode 100644 index 000000000..9cd37df32 --- /dev/null +++ b/include/crypto/internal/acompress.h @@ -0,0 +1,246 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Asynchronous Compression operations + * + * Copyright (c) 2016, Intel Corporation + * Authors: Weigang Li <weigang.li@intel.com> + * Giovanni Cabiddu <giovanni.cabiddu@intel.com> + */ +#ifndef _CRYPTO_ACOMP_INT_H +#define _CRYPTO_ACOMP_INT_H + +#include <crypto/acompress.h> +#include <crypto/algapi.h> +#include <crypto/scatterwalk.h> +#include <linux/compiler_types.h> +#include <linux/cpumask_types.h> +#include <linux/spinlock.h> +#include <linux/workqueue_types.h> + +#define ACOMP_FBREQ_ON_STACK(name, req) \ + char __##name##_req[sizeof(struct acomp_req) + \ + MAX_SYNC_COMP_REQSIZE] CRYPTO_MINALIGN_ATTR; \ + struct acomp_req *name = acomp_fbreq_on_stack_init( \ + __##name##_req, (req)) + +/** + * struct acomp_alg - asynchronous compression algorithm + * + * @compress: Function performs a compress operation + * @decompress: Function performs a de-compress operation + * @init: Initialize the cryptographic transformation object. + * This function is used to initialize the cryptographic + * transformation object. This function is called only once at + * the instantiation time, right after the transformation context + * was allocated. In case the cryptographic hardware has some + * special requirements which need to be handled by software, this + * function shall check for the precise requirement of the + * transformation and put any software fallbacks in place. + * @exit: Deinitialize the cryptographic transformation object. This is a + * counterpart to @init, used to remove various changes set in + * @init. + * + * @base: Common crypto API algorithm data structure + * @calg: Cmonn algorithm data structure shared with scomp + * @COMP_ALG_COMMON: see struct comp_alg_common + */ +struct acomp_alg { + int (*compress)(struct acomp_req *req); + int (*decompress)(struct acomp_req *req); + int (*init)(struct crypto_acomp *tfm); + void (*exit)(struct crypto_acomp *tfm); + + union { + struct COMP_ALG_COMMON; + struct comp_alg_common calg; + }; +}; + +struct crypto_acomp_stream { + spinlock_t lock; + void *ctx; +}; + +struct crypto_acomp_streams { + /* These must come first because of struct scomp_alg. */ + void *(*alloc_ctx)(void); + void (*free_ctx)(void *); + + struct crypto_acomp_stream __percpu *streams; + struct work_struct stream_work; + cpumask_t stream_want; +}; + +struct acomp_walk { + union { + /* Virtual address of the source. */ + struct { + struct { + const void *const addr; + } virt; + } src; + + /* Private field for the API, do not use. */ + struct scatter_walk in; + }; + + union { + /* Virtual address of the destination. */ + struct { + struct { + void *const addr; + } virt; + } dst; + + /* Private field for the API, do not use. */ + struct scatter_walk out; + }; + + unsigned int slen; + unsigned int dlen; + + int flags; +}; + +/* + * Transform internal helpers. + */ +static inline void *acomp_request_ctx(struct acomp_req *req) +{ + return req->__ctx; +} + +static inline void *acomp_tfm_ctx(struct crypto_acomp *tfm) +{ + return tfm->base.__crt_ctx; +} + +static inline void acomp_request_complete(struct acomp_req *req, + int err) +{ + crypto_request_complete(&req->base, err); +} + +/** + * crypto_register_acomp() -- Register asynchronous compression algorithm + * + * Function registers an implementation of an asynchronous + * compression algorithm + * + * @alg: algorithm definition + * + * Return: zero on success; error code in case of error + */ +int crypto_register_acomp(struct acomp_alg *alg); + +/** + * crypto_unregister_acomp() -- Unregister asynchronous compression algorithm + * + * Function unregisters an implementation of an asynchronous + * compression algorithm + * + * @alg: algorithm definition + */ +void crypto_unregister_acomp(struct acomp_alg *alg); + +int crypto_register_acomps(struct acomp_alg *algs, int count); +void crypto_unregister_acomps(struct acomp_alg *algs, int count); + +static inline bool acomp_request_issg(struct acomp_req *req) +{ + return !(req->base.flags & (CRYPTO_ACOMP_REQ_SRC_VIRT | + CRYPTO_ACOMP_REQ_DST_VIRT)); +} + +static inline bool acomp_request_src_isvirt(struct acomp_req *req) +{ + return req->base.flags & CRYPTO_ACOMP_REQ_SRC_VIRT; +} + +static inline bool acomp_request_dst_isvirt(struct acomp_req *req) +{ + return req->base.flags & CRYPTO_ACOMP_REQ_DST_VIRT; +} + +static inline bool acomp_request_isvirt(struct acomp_req *req) +{ + return req->base.flags & (CRYPTO_ACOMP_REQ_SRC_VIRT | + CRYPTO_ACOMP_REQ_DST_VIRT); +} + +static inline bool acomp_request_src_isnondma(struct acomp_req *req) +{ + return req->base.flags & CRYPTO_ACOMP_REQ_SRC_NONDMA; +} + +static inline bool acomp_request_dst_isnondma(struct acomp_req *req) +{ + return req->base.flags & CRYPTO_ACOMP_REQ_DST_NONDMA; +} + +static inline bool acomp_request_isnondma(struct acomp_req *req) +{ + return req->base.flags & (CRYPTO_ACOMP_REQ_SRC_NONDMA | + CRYPTO_ACOMP_REQ_DST_NONDMA); +} + +static inline bool crypto_acomp_req_virt(struct crypto_acomp *tfm) +{ + return crypto_tfm_req_virt(&tfm->base); +} + +void crypto_acomp_free_streams(struct crypto_acomp_streams *s); +int crypto_acomp_alloc_streams(struct crypto_acomp_streams *s); + +#define crypto_acomp_lock_stream_bh(...) __acquire_ret(_crypto_acomp_lock_stream_bh(__VA_ARGS__), &__ret->lock); +struct crypto_acomp_stream *_crypto_acomp_lock_stream_bh( + struct crypto_acomp_streams *s) __acquires_ret; + +static inline void crypto_acomp_unlock_stream_bh( + struct crypto_acomp_stream *stream) __releases(&stream->lock) +{ + spin_unlock_bh(&stream->lock); +} + +void acomp_walk_done_src(struct acomp_walk *walk, int used); +void acomp_walk_done_dst(struct acomp_walk *walk, int used); +int acomp_walk_next_src(struct acomp_walk *walk); +int acomp_walk_next_dst(struct acomp_walk *walk); +int acomp_walk_virt(struct acomp_walk *__restrict walk, + struct acomp_req *__restrict req, bool atomic); + +static inline bool acomp_walk_more_src(const struct acomp_walk *walk, int cur) +{ + return walk->slen != cur; +} + +static inline u32 acomp_request_flags(struct acomp_req *req) +{ + return crypto_request_flags(&req->base) & ~CRYPTO_ACOMP_REQ_PRIVATE; +} + +static inline struct crypto_acomp *crypto_acomp_fb(struct crypto_acomp *tfm) +{ + return __crypto_acomp_tfm(crypto_acomp_tfm(tfm)->fb); +} + +static inline struct acomp_req *acomp_fbreq_on_stack_init( + char *buf, struct acomp_req *old) +{ + struct crypto_acomp *tfm = crypto_acomp_reqtfm(old); + struct acomp_req *req = (void *)buf; + + crypto_stack_request_init(&req->base, + crypto_acomp_tfm(crypto_acomp_fb(tfm))); + acomp_request_set_callback(req, acomp_request_flags(old), NULL, NULL); + req->base.flags &= ~CRYPTO_ACOMP_REQ_PRIVATE; + req->base.flags |= old->base.flags & CRYPTO_ACOMP_REQ_PRIVATE; + req->src = old->src; + req->dst = old->dst; + req->slen = old->slen; + req->dlen = old->dlen; + + return req; +} + +#endif |