Commit 0e16aafb authored by Seth Jennings's avatar Seth Jennings Committed by Herbert Xu
Browse files

powerpc/crypto: add 842 hardware compression driver 



This patch adds the driver for interacting with the 842
compression accelerator on IBM Power7+ systems.

The device is a child of the Platform Facilities Option (PFO)
and shows up as a child of the IBM VIO bus.

The compression/decompression API takes the same arguments
as existing compression methods like lzo and deflate.  The 842
hardware operates on 4K hardware pages and the driver breaks up
input on 4K boundaries to submit it to the hardware accelerator.

Signed-off-by: default avatarRobert Jennings <rcj@linux.vnet.ibm.com>
Signed-off-by: default avatarSeth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent da29aa8f

MAINTAINERS

+6 −0
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@@ -3415,6 +3415,12 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux.git 
S:	Maintained

F:	arch/ia64/



IBM Power 842 compression accelerator

M:	Robert Jennings <rcj@linux.vnet.ibm.com>

S:	Supported

F:	drivers/crypto/nx/nx-842.c

F:	include/linux/nx842.h



IBM Power Linux RAID adapter

M:	Brian King <brking@us.ibm.com>

S:	Supported

drivers/crypto/nx/Kconfig

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@@ -15,3 +15,12 @@ config CRYPTO_DEV_NX_ENCRYPT 
	  Support for Power7+ in-Nest encryption acceleration. This

	  module supports acceleration for AES and SHA2 algorithms. If you

	  choose 'M' here, this module will be called nx_crypto.



config CRYPTO_DEV_NX_COMPRESS

	tristate "Compression acceleration support"

	depends on PPC64 && IBMVIO

	default y

	help

	  Support for Power7+ in-Nest compression acceleration. This

	  module supports acceleration for AES and SHA2 algorithms. If you

	  choose 'M' here, this module will be called nx_compress.

drivers/crypto/nx/Makefile

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@@ -9,3 +9,6 @@ nx-crypto-objs := nx.o \ 
		  nx-aes-xcbc.o \

		  nx-sha256.o \

		  nx-sha512.o



obj-$(CONFIG_CRYPTO_DEV_NX_COMPRESS) += nx-compress.o

nx-compress-objs := nx-842.o

drivers/crypto/nx/nx-842.c

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File added.

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include/linux/nx842.h

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#ifndef __NX842_H__

#define __NX842_H__



int nx842_get_workmem_size(void);

int nx842_get_workmem_size_aligned(void);

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

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