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hv_driver.h
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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. */
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 */