arch/tile/include/asm/hv_driver.h

   1 /*
   2  * Copyright 2010 Tilera Corporation. All Rights Reserved.
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful, but
   9  *   WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  11  *   NON INFRINGEMENT.  See the GNU General Public License for
  12  *   more details.
  13  *
  14  * This header defines a wrapper interface for managing hypervisor
  15  * device calls that will result in an interrupt at some later time.
  16  * In particular, this provides wrappers for hv_preada() and
  17  * hv_pwritea().
  18  */
  19
  20 #ifndef _ASM_TILE_HV_DRIVER_H
  21 #define _ASM_TILE_HV_DRIVER_H
  22
  23 #include <hv/hypervisor.h>
  24
  25 struct hv_driver_cb;
  26
  27 /* A callback to be invoked when an operation completes. */
  28 typedef void hv_driver_callback_t(struct hv_driver_cb *cb, __hv32 result);
  29
  30 /*
  31  * A structure to hold information about an outstanding call.
  32  * The driver must allocate a separate structure for each call.
  33  */
  34 struct hv_driver_cb {
  35         hv_driver_callback_t *callback;  /* Function to call on interrupt. */
  36         void *dev;                       /* Driver-specific state variable. */
  37 };
  38
  39 /* Wrapper for invoking hv_dev_preada(). */
  40 static inline int
  41 tile_hv_dev_preada(int devhdl, __hv32 flags, __hv32 sgl_len,
  42                    HV_SGL sgl[/* sgl_len */], __hv64 offset,
  43                    struct hv_driver_cb *callback)
  44 {
  45         return hv_dev_preada(devhdl, flags, sgl_len, sgl,
  46                              offset, (HV_IntArg)callback);
  47 }
  48
  49 /* Wrapper for invoking hv_dev_pwritea(). */
  50 static inline int
  51 tile_hv_dev_pwritea(int devhdl, __hv32 flags, __hv32 sgl_len,
  52                     HV_SGL sgl[/* sgl_len */], __hv64 offset,
  53                     struct hv_driver_cb *callback)
  54 {
  55         return hv_dev_pwritea(devhdl, flags, sgl_len, sgl,
  56                               offset, (HV_IntArg)callback);
  57 }
  58
  59
  60 #endif /* _ASM_TILE_HV_DRIVER_H */