diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/crypto/nx/Kconfig | 17 | ||||
| -rw-r--r-- | drivers/crypto/nx/Makefile | 4 | ||||
| -rw-r--r-- | drivers/crypto/nx/nx-842-crypto.c | 70 | ||||
| -rw-r--r-- | drivers/crypto/nx/nx-842.c | 103 | ||||
| -rw-r--r-- | drivers/crypto/nx/nx-842.h | 28 |
5 files changed, 60 insertions, 162 deletions
diff --git a/drivers/crypto/nx/Kconfig b/drivers/crypto/nx/Kconfig index e421c96c763a..ad7552a6998c 100644 --- a/drivers/crypto/nx/Kconfig +++ b/drivers/crypto/nx/Kconfig @@ -14,11 +14,14 @@ config CRYPTO_DEV_NX_ENCRYPT config CRYPTO_DEV_NX_COMPRESS tristate "Compression acceleration support" default y + select CRYPTO_ALGAPI + select 842_DECOMPRESS help Support for PowerPC Nest (NX) compression acceleration. This module supports acceleration for compressing memory with the 842 - algorithm. One of the platform drivers must be selected also. - If you choose 'M' here, this module will be called nx_compress. + algorithm using the cryptographic API. One of the platform + drivers must be selected also. If you choose 'M' here, this + module will be called nx_compress. if CRYPTO_DEV_NX_COMPRESS @@ -42,14 +45,4 @@ config CRYPTO_DEV_NX_COMPRESS_POWERNV algorithm. This supports NX hardware on the PowerNV platform. If you choose 'M' here, this module will be called nx_compress_powernv. -config CRYPTO_DEV_NX_COMPRESS_CRYPTO - tristate "Compression acceleration cryptographic interface" - select CRYPTO_ALGAPI - select 842_DECOMPRESS - default y - help - Support for PowerPC Nest (NX) accelerators using the cryptographic - API. If you choose 'M' here, this module will be called - nx_compress_crypto. - endif diff --git a/drivers/crypto/nx/Makefile b/drivers/crypto/nx/Makefile index e1684f5adb11..e29ee85b2431 100644 --- a/drivers/crypto/nx/Makefile +++ b/drivers/crypto/nx/Makefile @@ -13,9 +13,7 @@ nx-crypto-objs := nx.o \ obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS) += nx-compress.o nx-compress-platform.o obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS_PSERIES) += nx-compress-pseries.o obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS_POWERNV) += nx-compress-powernv.o -obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS_CRYPTO) += nx-compress-crypto.o -nx-compress-objs := nx-842.o +nx-compress-objs := nx-842-crypto.o nx-compress-platform-objs := nx-842-platform.o nx-compress-pseries-objs := nx-842-pseries.o nx-compress-powernv-objs := nx-842-powernv.o -nx-compress-crypto-objs := nx-842-crypto.o diff --git a/drivers/crypto/nx/nx-842-crypto.c b/drivers/crypto/nx/nx-842-crypto.c index 51ca168a82e9..4472e2001e79 100644 --- a/drivers/crypto/nx/nx-842-crypto.c +++ b/drivers/crypto/nx/nx-842-crypto.c @@ -13,6 +13,9 @@ * * Copyright (C) IBM Corporation, 2011-2015 * + * Designer of the Power data compression engine: + * Bulent Abali <abali@us.ibm.com> + * * Original Authors: Robert Jennings <rcj@linux.vnet.ibm.com> * Seth Jennings <sjenning@linux.vnet.ibm.com> * @@ -162,24 +165,11 @@ static void nx842_crypto_exit(struct crypto_tfm *tfm) free_page((unsigned long)ctx->dbounce); } -static int read_constraints(struct nx842_constraints *c) +static void check_constraints(struct nx842_constraints *c) { - int ret; - - ret = nx842_constraints(c); - if (ret) { - pr_err_ratelimited("could not get nx842 constraints : %d\n", - ret); - return ret; - } - /* limit maximum, to always have enough bounce buffer to decompress */ - if (c->maximum > BOUNCE_BUFFER_SIZE) { + if (c->maximum > BOUNCE_BUFFER_SIZE) c->maximum = BOUNCE_BUFFER_SIZE; - pr_info_once("limiting nx842 maximum to %x\n", c->maximum); - } - - return 0; } static int nx842_crypto_add_header(struct nx842_crypto_header *hdr, u8 *buf) @@ -260,7 +250,9 @@ nospc: timeout = ktime_add_ms(ktime_get(), COMP_BUSY_TIMEOUT); do { dlen = tmplen; /* reset dlen, if we're retrying */ - ret = nx842_compress(src, slen, dst, &dlen, ctx->wmem); + ret = nx842_platform_driver()->compress(src, slen, + dst, &dlen, + ctx->wmem); /* possibly we should reduce the slen here, instead of * retrying with the dbounce buffer? */ @@ -297,12 +289,14 @@ static int nx842_crypto_compress(struct crypto_tfm *tfm, struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm); struct nx842_crypto_header *hdr = &ctx->header; struct nx842_crypto_param p; - struct nx842_constraints c; + struct nx842_constraints c = *nx842_platform_driver()->constraints; unsigned int groups, hdrsize, h; int ret, n; bool add_header; u16 ignore = 0; + check_constraints(&c); + p.in = (u8 *)src; p.iremain = slen; p.out = dst; @@ -311,10 +305,6 @@ static int nx842_crypto_compress(struct crypto_tfm *tfm, *dlen = 0; - ret = read_constraints(&c); - if (ret) - return ret; - groups = min_t(unsigned int, NX842_CRYPTO_GROUP_MAX, DIV_ROUND_UP(p.iremain, c.maximum)); hdrsize = NX842_CRYPTO_HEADER_SIZE(groups); @@ -381,8 +371,7 @@ static int decompress(struct nx842_crypto_ctx *ctx, struct nx842_crypto_param *p, struct nx842_crypto_header_group *g, struct nx842_constraints *c, - u16 ignore, - bool usehw) + u16 ignore) { unsigned int slen = be32_to_cpu(g->compressed_length); unsigned int required_len = be32_to_cpu(g->uncompressed_length); @@ -404,9 +393,6 @@ static int decompress(struct nx842_crypto_ctx *ctx, src += padding; - if (!usehw) - goto usesw; - if (slen % c->multiple) adj_slen = round_up(slen, c->multiple); if (slen < c->minimum) @@ -443,7 +429,9 @@ static int decompress(struct nx842_crypto_ctx *ctx, timeout = ktime_add_ms(ktime_get(), DECOMP_BUSY_TIMEOUT); do { dlen = tmplen; /* reset dlen, if we're retrying */ - ret = nx842_decompress(src, slen, dst, &dlen, ctx->wmem); + ret = nx842_platform_driver()->decompress(src, slen, + dst, &dlen, + ctx->wmem); } while (ret == -EBUSY && ktime_before(ktime_get(), timeout)); if (ret) { usesw: @@ -486,10 +474,11 @@ static int nx842_crypto_decompress(struct crypto_tfm *tfm, struct nx842_crypto_ctx *ctx = crypto_tfm_ctx(tfm); struct nx842_crypto_header *hdr; struct nx842_crypto_param p; - struct nx842_constraints c; + struct nx842_constraints c = *nx842_platform_driver()->constraints; int n, ret, hdr_len; u16 ignore = 0; - bool usehw = true; + + check_constraints(&c); p.in = (u8 *)src; p.iremain = slen; @@ -499,9 +488,6 @@ static int nx842_crypto_decompress(struct crypto_tfm *tfm, *dlen = 0; - if (read_constraints(&c)) - usehw = false; - hdr = (struct nx842_crypto_header *)src; spin_lock_bh(&ctx->lock); @@ -516,7 +502,7 @@ static int nx842_crypto_decompress(struct crypto_tfm *tfm, .uncompressed_length = cpu_to_be32(p.oremain), }; - ret = decompress(ctx, &p, &g, &c, 0, usehw); + ret = decompress(ctx, &p, &g, &c, 0); if (ret) goto unlock; @@ -549,7 +535,7 @@ static int nx842_crypto_decompress(struct crypto_tfm *tfm, if (n + 1 == hdr->groups) ignore = be16_to_cpu(hdr->ignore); - ret = decompress(ctx, &p, &hdr->group[n], &c, ignore, usehw); + ret = decompress(ctx, &p, &hdr->group[n], &c, ignore); if (ret) goto unlock; } @@ -583,6 +569,18 @@ static struct crypto_alg alg = { static int __init nx842_crypto_mod_init(void) { + request_module("nx-compress-powernv"); + request_module("nx-compress-pseries"); + + /* we prevent loading/registering if there's no platform driver, + * and we get the platform module that set it so it won't unload, + * so we don't need to check if it's set in any of our functions + */ + if (!nx842_platform_driver_get()) { + pr_err("no nx842 platform driver found.\n"); + return -ENODEV; + } + return crypto_register_alg(&alg); } module_init(nx842_crypto_mod_init); @@ -590,11 +588,13 @@ module_init(nx842_crypto_mod_init); static void __exit nx842_crypto_mod_exit(void) { crypto_unregister_alg(&alg); + + nx842_platform_driver_put(); } module_exit(nx842_crypto_mod_exit); MODULE_LICENSE("GPL"); -MODULE_DESCRIPTION("IBM PowerPC Nest (NX) 842 Hardware Compression Interface"); +MODULE_DESCRIPTION("IBM PowerPC Nest (NX) 842 Hardware Compression Driver"); MODULE_ALIAS_CRYPTO("842"); MODULE_ALIAS_CRYPTO("842-nx"); MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>"); diff --git a/drivers/crypto/nx/nx-842.c b/drivers/crypto/nx/nx-842.c deleted file mode 100644 index 6e5e0d60d0c8..000000000000 --- a/drivers/crypto/nx/nx-842.c +++ /dev/null @@ -1,103 +0,0 @@ -/* - * Driver frontend for IBM Power 842 compression accelerator - * - * Copyright (C) 2015 Dan Streetman, IBM Corp - * - * Designer of the Power data compression engine: - * Bulent Abali <abali@us.ibm.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * 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 for more details. - */ - -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include "nx-842.h" - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Dan Streetman <ddstreet@ieee.org>"); -MODULE_DESCRIPTION("842 H/W Compression driver for IBM Power processors"); - -/** - * nx842_constraints - * - * This provides the driver's constraints. Different nx842 implementations - * may have varying requirements. The constraints are: - * @alignment: All buffers should be aligned to this - * @multiple: All buffer lengths should be a multiple of this - * @minimum: Buffer lengths must not be less than this amount - * @maximum: Buffer lengths must not be more than this amount - * - * The constraints apply to all buffers and lengths, both input and output, - * for both compression and decompression, except for the minimum which - * only applies to compression input and decompression output; the - * compressed data can be less than the minimum constraint. It can be - * assumed that compressed data will always adhere to the multiple - * constraint. - * - * The driver may succeed even if these constraints are violated; - * however the driver can return failure or suffer reduced performance - * if any constraint is not met. - */ -int nx842_constraints(struct nx842_constraints *c) -{ - memcpy(c, nx842_platform_driver()->constraints, sizeof(*c)); - return 0; -} -EXPORT_SYMBOL_GPL(nx842_constraints); - -/** - * nx842_workmem_size - * - * Get the amount of working memory the driver requires. - */ -size_t nx842_workmem_size(void) -{ - return nx842_platform_driver()->workmem_size; -} -EXPORT_SYMBOL_GPL(nx842_workmem_size); - -int nx842_compress(const unsigned char *in, unsigned int ilen, - unsigned char *out, unsigned int *olen, void *wmem) -{ - return nx842_platform_driver()->compress(in, ilen, out, olen, wmem); -} -EXPORT_SYMBOL_GPL(nx842_compress); - -int nx842_decompress(const unsigned char *in, unsigned int ilen, - unsigned char *out, unsigned int *olen, void *wmem) -{ - return nx842_platform_driver()->decompress(in, ilen, out, olen, wmem); -} -EXPORT_SYMBOL_GPL(nx842_decompress); - -static __init int nx842_init(void) -{ - request_module("nx-compress-powernv"); - request_module("nx-compress-pseries"); - - /* we prevent loading if there's no platform driver, and we get the - * module that set it so it won't unload, so we don't need to check - * if it's set in any of the above functions - */ - if (!nx842_platform_driver_get()) { - pr_err("no nx842 driver found.\n"); - return -ENODEV; - } - - return 0; -} -module_init(nx842_init); - -static void __exit nx842_exit(void) -{ - nx842_platform_driver_put(); -} -module_exit(nx842_exit); diff --git a/drivers/crypto/nx/nx-842.h b/drivers/crypto/nx/nx-842.h index ac0ea79d0f8b..c7dd0a4391e0 100644 --- a/drivers/crypto/nx/nx-842.h +++ b/drivers/crypto/nx/nx-842.h @@ -104,6 +104,25 @@ static inline unsigned long nx842_get_pa(void *addr) #define GET_FIELD(v, m) (((v) & (m)) >> MASK_LSH(m)) #define SET_FIELD(v, m, val) (((v) & ~(m)) | (((val) << MASK_LSH(m)) & (m))) +/** + * This provides the driver's constraints. Different nx842 implementations + * may have varying requirements. The constraints are: + * @alignment: All buffers should be aligned to this + * @multiple: All buffer lengths should be a multiple of this + * @minimum: Buffer lengths must not be less than this amount + * @maximum: Buffer lengths must not be more than this amount + * + * The constraints apply to all buffers and lengths, both input and output, + * for both compression and decompression, except for the minimum which + * only applies to compression input and decompression output; the + * compressed data can be less than the minimum constraint. It can be + * assumed that compressed data will always adhere to the multiple + * constraint. + * + * The driver may succeed even if these constraints are violated; + * however the driver can return failure or suffer reduced performance + * if any constraint is not met. + */ struct nx842_constraints { int alignment; int multiple; @@ -132,13 +151,4 @@ void nx842_platform_driver_unset(struct nx842_driver *driver); bool nx842_platform_driver_get(void); void nx842_platform_driver_put(void); -size_t nx842_workmem_size(void); - -int nx842_constraints(struct nx842_constraints *constraints); - -int nx842_compress(const unsigned char *in, unsigned int in_len, - unsigned char *out, unsigned int *out_len, void *wrkmem); -int nx842_decompress(const unsigned char *in, unsigned int in_len, - unsigned char *out, unsigned int *out_len, void *wrkmem); - #endif /* __NX_842_H__ */ |