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1 /* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
2 
3 Licensed under the Apache License, Version 2.0 (the "License");
4 you may not use this file except in compliance with the License.
5 You may obtain a copy of the License at
6 
7     http://www.apache.org/licenses/LICENSE-2.0
8 
9 Unless required by applicable law or agreed to in writing, software
10 distributed under the License is distributed on an "AS IS" BASIS,
11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 See the License for the specific language governing permissions and
13 limitations under the License.
14 ==============================================================================*/
15 
16 // Defines types and declares functions for identifying and extracting
17 // information about the types of platforms and supporting libraries for which
18 // StreamExecutor implementations exist.
19 #ifndef TENSORFLOW_STREAM_EXECUTOR_PLATFORM_H_
20 #define TENSORFLOW_STREAM_EXECUTOR_PLATFORM_H_
21 
22 #include <map>
23 
24 #include "tensorflow/stream_executor/device_options.h"
25 #include "tensorflow/stream_executor/lib/status.h"
26 #include "tensorflow/stream_executor/lib/status_macros.h"
27 #include "tensorflow/stream_executor/lib/statusor.h"
28 #include "tensorflow/stream_executor/platform/port.h"
29 #include "tensorflow/stream_executor/plugin.h"
30 #include "tensorflow/stream_executor/trace_listener.h"
31 
32 namespace stream_executor {
33 
34 class StreamExecutor;
35 
36 // Describes the platform for a StreamExecutor instantiation to act upon.
37 //
38 // Implementors: if you add a value here be sure to update PlatformKindString
39 // and CheckPlatformKindIsValid.
40 enum class PlatformKind {
41   kInvalid,
42   kCuda,
43   kROCm,
44   kOpenCL,
45   kHost,
46   kMock,
47   kSize,
48 };
49 
50 // Returns true if kind represents a valid platform capable of enqueuing items
51 // on a stream, but not necessarily on an accelerator device.
52 // Returns false for kMock and any invalid PlatformKind values.
53 bool PlatformIsRunnable(PlatformKind kind);
54 
55 // Returns true if kind represents a valid platform capable of running kernels
56 // on an accelerator device. Returns false for kHost*, kMock and any invalid
57 // PlatformKind values.
58 bool PlatformIsRunnableOnDevice(PlatformKind kind);
59 
60 // Returns a printable description of a PlatformKind.
61 string PlatformKindString(PlatformKind kind);
62 
63 // Returns the PlatformKind corresponding to the input string; returns kInvalid
64 // in the case of no match.
65 PlatformKind PlatformKindFromString(string platform_string);
66 
67 // Checks that kind takes on a valid value.
68 void CheckPlatformKindIsValid(PlatformKind kind);
69 
70 // StreamExecutorConfig encapsulates the set of options for constructing a
71 // StreamExecutor for a given platform.
72 struct StreamExecutorConfig {
73   // Sets members to defaults: -1 for ordinal (must be changed), and default
74   // PluginConfig and DeviceOptions.
75   StreamExecutorConfig();
76 
77   // Simple ordinal-setting constructor.
78   explicit StreamExecutorConfig(int ordinal);
79 
80   // The ordinal of the device to be managed by the returned StreamExecutor.
81   int ordinal;
82 
83   // The PluginConfig for the returned StreamExecutor.
84   PluginConfig plugin_config;
85 
86   // The DeviceOptions for the returned StreamExecutor.
87   DeviceOptions device_options;
88 };
89 
90 // Abstract base class for a platform registered with the MultiPlatformManager.
91 class Platform {
92  public:
93   virtual ~Platform();
94 
95   // A platform ID is a unique identifier for each registered platform type -
96   // each platform is required to expose an ID to ensure unique registration and
97   // as a target against which plugins can register.
98   //
99   // The macro below is provided to help generate a [process-unique] identifier.
100   using Id = void*;
101 
102 // Helper macro to define a plugin ID. To be used only inside plugin
103 // implementation files. Works by "reserving" an address/value (guaranteed to be
104 // unique) inside a process space.
105 #define PLATFORM_DEFINE_ID(ID_VAR_NAME) \
106   namespace {                           \
107   int plugin_id_value;                  \
108   }                                     \
109   const ::stream_executor::Platform::Id ID_VAR_NAME = &plugin_id_value;
110 
111   // Returns a key uniquely identifying this platform.
112   virtual Id id() const = 0;
113 
114   // Name of this platform.
115   virtual const string& Name() const = 0;
116 
117   // Returns the number of devices accessible on this platform.
118   //
119   // Note that, though these devices are visible, if there is only one userspace
120   // context allowed for the device at a time and another process is using this
121   // device, a call to ExecutorForDevice may return an error status.
122   virtual int VisibleDeviceCount() const = 0;
123 
124   // Returns true iff the platform has been initialized.
125   virtual bool Initialized() const;
126 
127   // Initializes the platform with a custom set of options. The platform must be
128   // initialized before obtaining StreamExecutor objects.  The interpretation of
129   // the platform_options argument is implementation specific.  This method may
130   // return an error if unrecognized options are provided.  If using
131   // MultiPlatformManager, this method will be called automatically by
132   // InitializePlatformWithId/InitializePlatformWithName.
133   virtual port::Status Initialize(
134       const std::map<string, string>& platform_options);
135 
136   // Returns a device with the given ordinal on this platform with a default
137   // plugin configuration or, if none can be found with the given ordinal or
138   // there is an error in opening a context to communicate with the device, an
139   // error status is returned.
140   //
141   // Ownership of the executor is NOT transferred to the caller --
142   // the Platform owns the executors in a singleton-like fashion.
143   virtual port::StatusOr<StreamExecutor*> ExecutorForDevice(int ordinal) = 0;
144 
145   // Returns a device or error, as above, with the specified plugins.
146   //
147   // Ownership of the executor is NOT transferred to the caller.
148   virtual port::StatusOr<StreamExecutor*> ExecutorForDeviceWithPluginConfig(
149       int ordinal, const PluginConfig& plugin_config) = 0;
150 
151   // Returns a device constructed with the options specified in "config".
152   // Ownership of the executor is NOT transferred to the caller.
153   virtual port::StatusOr<StreamExecutor*> GetExecutor(
154       const StreamExecutorConfig& config) = 0;
155 
156   // Returns a device constructed with the options specified in "config" without
157   // looking in or storing to the Platform's executor cache.
158   // Ownership IS transferred to the caller.
159   virtual port::StatusOr<std::unique_ptr<StreamExecutor>> GetUncachedExecutor(
160       const StreamExecutorConfig& config) = 0;
161 
162   // Warning: this is a dangerous API and should be used with caution.
163   //
164   // Forces the platform to delete executor instances, releasing their
165   // associated device contexts. There must be no held instances of the executor
166   // and there must be no outstanding activity on the devices for this platform.
167   //
168   // This is only useful on platforms which bind a device to a single process
169   // that has obtained the device context. May return UNIMPLEMENTED on platforms
170   // that have no reason to destroy device contexts.
171   //
172   // The platform must be reinitialized after this is called.
173   virtual port::Status ForceExecutorShutdown();
174 
175   // Registers a TraceListener to listen to all StreamExecutors for this
176   // platform.
177   // Takes ownership of listener.
178   virtual void RegisterTraceListener(
179       std::unique_ptr<TraceListener> listener) = 0;
180 
181   // Removes the specified TraceListener from all StreamExecutors.
182   virtual void UnregisterTraceListener(TraceListener* listener) = 0;
183 
184   // Map of executor-to-executor coordinate and boolean, indicating if the first
185   // executor can access the second's memory.
186   using PeerAccessMap = std::map<std::pair<int, int>, bool>;
187 
188   // Returns a matrix indicating which executors can access which other
189   // executors' memory.
190   virtual std::unique_ptr<PeerAccessMap> GetPeerAccessMap();
191 
192   // Attempts to enable all peer-to-peer access links described by the result of
193   // GetPeerAccessMap(). Note that calling this routine will force the creation
194   // of a default-argument (see StreamExecutorConfig) StreamExecutor object for
195   // each device ordinal in the system, should any not yet exist.
196   virtual port::Status EnablePeerAccess();
197 
198  protected:
199   // SE_DISALLOW_COPY_AND_ASSIGN declares a constructor, which suppresses the
200   // presence of the default constructor. This statement re-enables it, which
201   // simplifies subclassing.
202   Platform() = default;
203 
204  private:
205   SE_DISALLOW_COPY_AND_ASSIGN(Platform);
206 };
207 
208 }  // namespace stream_executor
209 
210 #endif  // TENSORFLOW_STREAM_EXECUTOR_PLATFORM_H_
211