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  What:		/sys/kernel/debug/nx-crypto/*
  Date:		March 2012
  KernelVersion:	3.4
  Contact:	Kent Yoder <key@linux.vnet.ibm.com>
  Description:
  
    These debugfs interfaces are built by the nx-crypto driver, built in
  arch/powerpc/crypto/nx.
  
  Error Detection
  ===============
  
  errors:
  - A u32 providing a total count of errors since the driver was loaded. The
  only errors counted here are those returned from the hcall, H_COP_OP.
  
  last_error:
  - The most recent non-zero return code from the H_COP_OP hcall. -EBUSY is not
  recorded here (the hcall will retry until -EBUSY goes away).
  
  last_error_pid:
  - The process ID of the process who received the most recent error from the
  hcall.
  
  Device Use
  ==========
  
  aes_bytes:
  - The total number of bytes encrypted using AES in any of the driver's
  supported modes.
  
  aes_ops:
  - The total number of AES operations submitted to the hardware.
  
  sha256_bytes:
  - The total number of bytes hashed by the hardware using SHA-256.
  
  sha256_ops:
  - The total number of SHA-256 operations submitted to the hardware.
  
  sha512_bytes:
  - The total number of bytes hashed by the hardware using SHA-512.
  
  sha512_ops:
  - The total number of SHA-512 operations submitted to the hardware.