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Date: Thu, 7 May 2015 13:49:11 -0400 From: Dan Streetman <ddstreet@...e.org> To: Herbert Xu <herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net>, Michael Ellerman <mpe@...erman.id.au>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org> Cc: Seth Jennings <sjennings@...iantweb.net>, Robert Jennings <rob@...hix.net>, linux-crypto@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org, Dan Streetman <ddstreet@...e.org> Subject: [PATCHv3 00/10] add 842 hw compression for PowerNV platform IBM PowerPC processors starting at version P7+ contain a NX coprocessor that provides various hw-accelerated functions, one of which is memory compression to the IBM "842" compression format. This NX-842 coprocessor is already supported on the pSeries platform, by the nx-842.c driver and the crypto compression interface at crypto/842.c. This patch set adds support for NX-842 on the PowerNV (Non-Virtualized) platform, as well as adding a full software 842 compression/decompression implementation. Quick summary of changes: the current 842 crypto compression interface uses only the 842 hardware on pSeries platforms, and can handle only page-sized and page-aligned uncompressed buffers. These patches add a full software 842 impementation, change the crypto/ directory 842 interface to a software only implementation, add a 842 hardware crypto compression interface that can handle any size and alignment buffers, add a driver for 842 hardware on PowerNV platforms, and create a common interface for both 842 hardware platform drivers. The existing pSeries platform NX-842 driver could not be re-used for the PowerNV platform driver, as there are fundamentally different interfaces; on pSeries the system hypervisor (pHyp) provides the interface and manages communication with the coprocessor, while on PowerNV the kernel talks directly to the coprocessor using the ICSWX instruction. The data structures used to describe each compression or decompression request to the coprocessor are also different between pHyp's interface and direct communication with ICSWX. So, different drivers for pSeries and PowerNV are required. Adding the new PowerNV driver but keeping the interface to the drivers the same required adding a new common frontend interface, to which only one of the platform drivers will connect (based on what platform the kernel is currently running on), and moving some functionality out of the existing pSeries driver into a more common location. The existing crypto/842.c interface is in the wrong place, since crypto/ should only contain software implementations; so lib/842/ is added containing a reference (i.e. rather slow) implementation in software of both 842 compression and 842 decompression. The crypto/842.c interface is changed to use only that software implementation. The hardware 842 crypto compression interface is moved to drivers/crypto/nx/nx-842-crypto.c. It is also modified to be able to handle any alignment/length input or output buffer; currently it is only able to handle page-size and page-aligned (uncompressed) buffers, due to restrictions in the pSeries 842 hardware driver. v3 changes the sw and hw crypto drivers to use the same alg name "842", and different driver names, "842-generic" and "842-nx" Dan Streetman (10): powerpc: export of_get_ibm_chip_id function powerpc: Add ICSWX instruction lib: add software 842 compression/decompression crypto: change 842 alg to use software drivers/crypto/nx: rename nx-842.c to nx-842-pseries.c drivers/crypto/nx: add NX-842 platform frontend driver drivers/crypto/nx: add nx842 constraints drivers/crypto/nx: add PowerNV platform NX-842 driver drivers/crypto/nx: simplify pSeries nx842 driver drivers/crypto/nx: add hardware 842 crypto comp alg MAINTAINERS | 5 +- arch/powerpc/include/asm/icswx.h | 184 ++++ arch/powerpc/include/asm/ppc-opcode.h | 13 + arch/powerpc/kernel/prom.c | 1 + crypto/842.c | 174 +--- crypto/Kconfig | 7 +- drivers/crypto/Kconfig | 10 +- drivers/crypto/nx/Kconfig | 55 +- drivers/crypto/nx/Makefile | 6 + drivers/crypto/nx/nx-842-crypto.c | 585 ++++++++++++ drivers/crypto/nx/nx-842-powernv.c | 625 +++++++++++++ drivers/crypto/nx/nx-842-pseries.c | 1128 +++++++++++++++++++++++ drivers/crypto/nx/nx-842.c | 1623 +++------------------------------ drivers/crypto/nx/nx-842.h | 131 +++ include/linux/nx842.h | 21 +- include/linux/sw842.h | 12 + lib/842/842.h | 127 +++ lib/842/842_compress.c | 626 +++++++++++++ lib/842/842_debugfs.h | 52 ++ lib/842/842_decompress.c | 405 ++++++++ lib/842/Makefile | 2 + lib/Kconfig | 6 + lib/Makefile | 2 + 23 files changed, 4120 insertions(+), 1680 deletions(-) create mode 100644 arch/powerpc/include/asm/icswx.h create mode 100644 drivers/crypto/nx/nx-842-crypto.c create mode 100644 drivers/crypto/nx/nx-842-powernv.c create mode 100644 drivers/crypto/nx/nx-842-pseries.c create mode 100644 drivers/crypto/nx/nx-842.h create mode 100644 include/linux/sw842.h create mode 100644 lib/842/842.h create mode 100644 lib/842/842_compress.c create mode 100644 lib/842/842_debugfs.h create mode 100644 lib/842/842_decompress.c create mode 100644 lib/842/Makefile -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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