gem5  v21.1.0.2
device.cc
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2015 ARM Limited
3  * All rights reserved
4  *
5  * The license below extends only to copyright in the software and shall
6  * not be construed as granting a license to any other intellectual
7  * property including but not limited to intellectual property relating
8  * to a hardware implementation of the functionality of the software
9  * licensed hereunder. You may use the software subject to the license
10  * terms below provided that you ensure that this notice is replicated
11  * unmodified and in its entirety in all distributions of the software,
12  * modified or unmodified, in source code or in binary form.
13  *
14  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions are
16  * met: redistributions of source code must retain the above copyright
17  * notice, this list of conditions and the following disclaimer;
18  * redistributions in binary form must reproduce the above copyright
19  * notice, this list of conditions and the following disclaimer in the
20  * documentation and/or other materials provided with the distribution;
21  * neither the name of the copyright holders nor the names of its
22  * contributors may be used to endorse or promote products derived from
23  * this software without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36  */
37 
38 #include "cpu/kvm/device.hh"
39 
40 #include <linux/kvm.h>
41 #include <sys/ioctl.h>
42 #include <unistd.h>
43 
44 #include <cassert>
45 #include <cerrno>
46 
47 #include "base/logging.hh"
48 
49 namespace gem5
50 {
51 
53  : fd(_fd)
54 {
55 }
56 
58 {
59  close(fd);
60 }
61 
62 void
63 KvmDevice::getAttrPtr(uint32_t group, uint64_t attr, void *data) const
64 {
65 #ifdef KVM_GET_DEVICE_ATTR
66  struct kvm_device_attr dattr =
67  {
68  0, // Flags
69  group,
70  attr,
71  reinterpret_cast<uint64_t>(data),
72  };
73 
74  if (ioctl(KVM_GET_DEVICE_ATTR, &dattr) == -1) {
75  panic("Failed to get attribute (group: %i, attr: %i, errno: %i)",
76  group, attr, errno);
77  }
78 #else
79  panic("Kernel headers don't support KVM_GET_DEVICE_ATTR\n");
80 #endif
81 }
82 
83 void
84 KvmDevice::setAttrPtr(uint32_t group, uint64_t attr, const void *data) const
85 {
86 #ifdef KVM_SET_DEVICE_ATTR
87  struct kvm_device_attr dattr =
88  {
89  0, // Flags
90  group,
91  attr,
92  reinterpret_cast<uint64_t>(data),
93  };
94 
95  if (ioctl(KVM_SET_DEVICE_ATTR, &dattr) == -1) {
96  panic("Failed to set attribute (group: %i, attr: %i, errno: %i)",
97  group, attr, errno);
98  }
99 #else
100  panic("Kernel headers don't support KVM_GET_DEVICE_ATTR\n");
101 #endif
102 }
103 
104 bool
105 KvmDevice::hasAttr(uint32_t group, uint64_t attr) const
106 {
107 #ifdef KVM_HAS_DEVICE_ATTR
108  struct kvm_device_attr dattr =
109  {
110  0, // Flags
111  group,
112  attr,
113  0, // Data address (ignored)
114  };
115 
116  return ioctl(KVM_HAS_DEVICE_ATTR, &dattr) == 0;
117 #else
118  panic("Kernel headers don't support KVM_HAS_DEVICE_ATTR\n");
119 #endif
120 }
121 
122 int
123 KvmDevice::ioctl(int request, long p1) const
124 {
125  assert(fd != -1);
126 
127  return ::ioctl(fd, request, p1);
128 }
129 
130 } // namespace gem5
data
const char data[]
Definition: circlebuf.test.cc:48
gem5::ArmISA::fd
Bitfield< 14, 12 > fd
Definition: types.hh:150
gem5::KvmDevice::ioctl
int ioctl(int request, long p1) const
Definition: device.cc:123
gem5::KvmDevice::KvmDevice
KvmDevice(int fd)
Definition: device.cc:52
gem5::ArmISA::attr
attr
Definition: misc_types.hh:655
gem5::KvmDevice::~KvmDevice
virtual ~KvmDevice()
Definition: device.cc:57
gem5::KvmDevice::fd
int fd
Definition: device.hh:124
gem5::KvmDevice::setAttrPtr
void setAttrPtr(uint32_t group, uint64_t attr, const void *data) const
Definition: device.cc:84
device.hh
gem5::KvmDevice::hasAttr
bool hasAttr(uint32_t group, uint64_t attr) const
Check if a device attribute is valid.
Definition: device.cc:105
logging.hh
gem5::KvmDevice::getAttrPtr
void getAttrPtr(uint32_t group, uint64_t attr, void *data) const
Definition: device.cc:63
gem5
Reference material can be found at the JEDEC website: UFS standard http://www.jedec....
Definition: decoder.cc:40
panic
#define panic(...)
This implements a cprintf based panic() function.
Definition: logging.hh:177

Generated on Tue Sep 21 2021 12:25:00 for gem5 by doxygen 1.8.17