Add support to the nx-842-pseries.c driver for running in little endian
mode.
The pSeries platform NX 842 driver currently only works as big endian.
This adds cpu_to_be*() and be*_to_cpu() in the appropriate places to
work in LE mode also.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Replace the NX842_MEM_COMPRESS define with a function that returns the
specific platform driver's required working memory size.
The common nx-842.c driver refuses to load if there is no platform
driver present, so instead of defining an approximate working memory
size that's the maximum approximate size of both platform driver's
size requirements, the platform driver can directly provide its
specific, i.e. sizeof(struct nx842_workmem), size requirements which
the 842-nx crypto compression driver will use.
This saves memory by both reducing the required size of each driver
to the specific sizeof() amount, as well as using the specific loaded
platform driver's required amount, instead of the maximum of both.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reduce the nx-842 pSeries driver minimum buffer size from 128 to 8.
Also replace the single use of IO_BUFFER_ALIGN macro with the standard
and correct DDE_BUFFER_ALIGN.
The hw sometimes rejects buffers that contain padding past the end of the
8-byte aligned section where it sees the "end" marker. With the minimum
buffer size set too high, some highly compressed buffers were being padded
and the hw was incorrectly rejecting them; this sets the minimum correctly
so there will be no incorrect padding.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Change the nx-842 common driver to wait for loading of both platform
drivers, and fail loading if the platform driver pointer is not set.
Add an independent platform driver pointer, that the platform drivers
set if they find they are able to load (i.e. if they find their platform
devicetree node(s)).
The problem is currently, the main nx-842 driver will stay loaded even
if there is no platform driver and thus no possible way it can do any
compression or decompression. This allows the crypto 842-nx driver
to load even if it won't actually work. For crypto compression users
(e.g. zswap) that expect an available crypto compression driver to
actually work, this is bad. This patch fixes that, so the 842-nx crypto
compression driver won't load if it doesn't have the driver and hardware
available to perform the compression.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Simplify the pSeries NX-842 driver: do not expect incoming buffers to be
exactly page-sized; do not break up input buffers to compress smaller
blocks; do not use any internal headers in the compressed data blocks;
remove the software decompression implementation; implement the pSeries
nx842_constraints.
This changes the pSeries NX-842 driver to perform constraints-based
compression so that it only needs to compress one entire input block at a
time. This removes the need for it to split input data blocks into
multiple compressed data sections in the output buffer, and removes the
need for any extra header info in the compressed data; all that is moved
(in a later patch) into the main crypto 842 driver. Additionally, the
842 software decompression implementation is no longer needed here, as
the crypto 842 driver will use the generic software 842 decompression
function as a fallback if any hardware 842 driver fails.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Add driver for NX-842 hardware on the PowerNV platform.
This allows the use of the 842 compression hardware coprocessor on
the PowerNV platform.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Add "constraints" for the NX-842 driver. The constraints are used to
indicate what the current NX-842 platform driver is capable of. The
constraints tell the NX-842 user what alignment, min and max length, and
length multiple each provided buffers should conform to. These are
required because the 842 hardware requires buffers to meet specific
constraints that vary based on platform - for example, the pSeries
max length is much lower than the PowerNV max length.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Add NX-842 frontend that allows using either the pSeries platform or
PowerNV platform driver (to be added by later patch) for the NX-842
hardware. Update the MAINTAINERS file to include the new filenames.
Update Kconfig files to clarify titles and descriptions, and correct
dependencies.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Move the entire NX-842 driver for the pSeries platform from the file
nx-842.c to nx-842-pseries.c. This is required by later patches that
add NX-842 support for the PowerNV platform.
This patch does not alter the content of the pSeries NX-842 driver at
all, it only changes the filename.
Signed-off-by: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
2015-05-11 15:06:45 +08:00
Renamed from drivers/crypto/nx/nx-842.c (Browse further)
