contexthubhal/system_comms.h - device/google/contexthub - Git at Google

 /*
  * Copyright (C) 2016 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #ifndef _NANOHUB_SYSTEM_COMMS_H_
 #define _NANOHUB_SYSTEM_COMMS_H_

 #include <utils/Condition.h>
 #include <utils/Mutex.h>

 #include <map>
 #include <vector>

 #include <hardware/context_hub.h>
 #include "nanohubhal.h"
 #include "message_buf.h"

 //rx: return 0 if handled, > 0 if not handled, < 0 if error happened

 #define MSG_HANDLED 0

 //messages to the HostIf nanoapp & their replies (mesages and replies both begin with u8 message_type)
 #define NANOHUB_EXT_APPS_ON        0 // () -> (char success)
 #define NANOHUB_EXT_APPS_OFF       1 // () -> (char success)
 #define NANOHUB_EXT_APP_DELETE     2 // (u64 name) -> (char success)    //idempotent
 #define NANOHUB_QUERY_MEMINFO      3 // () -> (mem_info)
 #define NANOHUB_QUERY_APPS         4 // (u32 idxStart) -> (app_info[idxStart] OR EMPTY IF NO MORE)
 #define NANOHUB_QUERY_RSA_KEYS     5 // (u32 byteOffset) -> (u8 data[1 or more bytes] OR EMPTY IF NO MORE)
 #define NANOHUB_START_UPLOAD       6 // (char isOs, u32 totalLenToTx) -> (char success)
 #define NANOHUB_CONT_UPLOAD        7 // (u32 offset, u8 data[]) -> (char success)
 #define NANOHUB_FINISH_UPLOAD      8 // () -> (char success)
 #define NANOHUB_REBOOT             9 // () -> (char success)

 // Custom defined private messages
 #define CONTEXT_HUB_LOAD_OS (CONTEXT_HUB_TYPE_PRIVATE_MSG_BASE + 1)


 #define NANOHUB_APP_NOT_LOADED  (-1)
 #define NANOHUB_APP_LOADED      (0)

 #define NANOHUB_UPLOAD_CHUNK_SZ_MAX 64
 #define NANOHUB_MEM_SZ_UNKNOWN      0xFFFFFFFFUL

 namespace android {

 namespace nanohub {

 int system_comms_handle_rx(const nano_message *msg);
 int system_comms_handle_tx(const hub_message_t *outMsg);

 struct NanohubAppInfo {
     hub_app_name_t name;
     uint32_t version, flashUse, ramUse;
 } __attribute__((packed));

 struct NanohubMemInfo {
     //sizes
     uint32_t flashSz, blSz, osSz, sharedSz, eeSz;
     uint32_t ramSz;

     //use
     uint32_t blUse, osUse, sharedUse, eeUse;
     uint32_t ramUse;
 } __attribute__((packed));

 struct NanohubRsp {
     uint32_t cmd;
     int32_t status;
     NanohubRsp(MessageBuf &buf, bool no_status = false);
 };

 inline bool operator == (const hub_app_name_t &a, const hub_app_name_t &b) {
     return a.id == b.id;
 }

 inline bool operator != (const hub_app_name_t &a, const hub_app_name_t &b) {
     return !(a == b);
 }

 class SystemComm {
 private:

     /*
      * Nanohub HAL sessions
      *
      * Session is an object that can group several message exchanges with FW,
      * maintain state, and be waited for completion by someone else.
      *
      * As of this moment, since all sessions are triggered by client thread,
      * and all the exchange is happening in local worker thread, it is only possible
      * for client thread to wait on session completion.
      * Allowing sessions to wait on each other will require a worker thread pool.
      * It is now unnecessary, and not implemented.
      */
     class ISession {
     public:
         virtual int setup(const hub_message_t *app_msg) = 0;
         virtual int handleRx(MessageBuf &buf) = 0;
         virtual int getState() const = 0; // FSM state
         virtual int getStatus() const = 0; // execution status (result code)
         virtual ~ISession() {}
     };

     class SessionManager;

     class Session : public ISession {
         friend class SessionManager;

         mutable Mutex mDoneLock; // controls condition and state transitions
         Condition mDoneWait;
         volatile int mState;

     protected:
         mutable Mutex mLock; // serializes message handling
         int32_t mStatus;

         enum {
             SESSION_INIT = 0,
             SESSION_DONE = 1,
             SESSION_USER = 2,
         };

         void complete() {
             Mutex::Autolock _l(mDoneLock);
             if (mState != SESSION_DONE) {
                 mState = SESSION_DONE;
                 mDoneWait.broadcast();
             }
         }
         void setState(int state) {
             if (state == SESSION_DONE) {
                 complete();
             } else {
                 Mutex::Autolock _l(mDoneLock);
                 mState = state;
             }
         }
     public:
         Session() { mState = SESSION_INIT; mStatus = -1; }
         int getStatus() const {
             Mutex::Autolock _l(mLock);
             return mStatus;
         }
         int wait() {
             Mutex::Autolock _l(mDoneLock);
             while (mState != SESSION_DONE) {
                 mDoneWait.wait(mDoneLock);
             }
             return 0;
         }
         virtual int getState() const override {
             Mutex::Autolock _l(mDoneLock);
             return mState;
         }
         virtual bool isDone() const {
             Mutex::Autolock _l(mDoneLock);
             return mState == SESSION_DONE;
         }
         virtual bool isRunning() const {
             Mutex::Autolock _l(mDoneLock);
             return mState > SESSION_DONE;
         }
     };

     class AppMgmtSession : public Session {
         enum {
             TRANSFER = SESSION_USER,
             FINISH,
             RELOAD,
             REBOOT,
             MGMT,
         };
         uint32_t mCmd; // UPLOAD_APP | UPPLOAD_OS
         uint32_t mResult;
         std::vector<uint8_t> mData;
         uint32_t mLen;
         uint32_t mPos;

         int setupMgmt(const hub_message_t *appMsg, uint32_t cmd);
         int handleTransfer(NanohubRsp &rsp);
         int handleFinish(NanohubRsp &rsp);
         int handleReload(NanohubRsp &rsp);
         int handleReboot(NanohubRsp &rsp);
         int handleMgmt(NanohubRsp &rsp);
     public:
         AppMgmtSession() {
             mCmd = 0;
             mResult = 0;
             mPos = 0;
             mLen = 0;
         }
         virtual int handleRx(MessageBuf &buf) override;
         virtual int setup(const hub_message_t *app_msg) override;
     };

     class MemInfoSession : public Session {
     public:
         virtual int setup(const hub_message_t *app_msg) override;
         virtual int handleRx(MessageBuf &buf) override;
     };

     class KeyInfoSession  : public Session {
         std::vector<uint8_t> mRsaKeyData;
         int requestRsaKeys(void);
     public:
         virtual int setup(const hub_message_t *) override;
         virtual int handleRx(MessageBuf &buf) override;
         bool haveKeys() const {
             Mutex::Autolock _l(mLock);
             return mRsaKeyData.size() > 0 && !isRunning();
         }
     };

     class AppInfoSession : public Session {
         std::vector<hub_app_info> mAppInfo;
         int requestNext();
     public:
         virtual int setup(const hub_message_t *) override;
         virtual int handleRx(MessageBuf &buf) override;
     };

     class GlobalSession : public Session {
     public:
         virtual int setup(const hub_message_t *) override;
         virtual int handleRx(MessageBuf &buf) override;
     };

     class SessionManager {
         typedef std::map<int, Session* > SessionMap;

         Mutex lock;
         SessionMap sessions_;
         GlobalSession mGlobal;

         void next(SessionMap::iterator &pos)
         {
             Mutex::Autolock _l(lock);
             pos->second->isDone() ? pos = sessions_.erase(pos) : ++pos;
         }

     public:
         SessionManager() {
             mGlobal.setup(nullptr);
         }
         int handleRx(MessageBuf &buf);
         int setup_and_add(int id, Session *session, const hub_message_t *appMsg) {
             Mutex::Autolock _l(lock);
             if (sessions_.count(id) == 0 && !session->isRunning()) {
                 int ret = session->setup(appMsg);
                 if (ret < 0) {
                     session->complete();
                 } else {
                     sessions_[id] = session;
                 }
                 return ret;
             }
             return -EBUSY;
         }

     } mSessions;

     const hub_app_name_t mHostIfAppName = {
         .id = NANO_APP_ID(NANOAPP_VENDOR_GOOGLE, 0)
     };

     static SystemComm *getSystem() {
         // this is thread-safe in c++11
         static SystemComm theInstance;
         return &theInstance;
     }

     SystemComm () = default;
     ~SystemComm() = default;

     int doHandleTx(const hub_message_t *txMsg);
     int doHandleRx(const nano_message *rxMsg);

     static void sendToApp(uint32_t typ, const void *data, uint32_t len) {
         if (NanoHub::messageTracingEnabled()) {
             dumpBuffer("HAL -> APP", get_hub_info()->os_app_name, typ, data, len);
         }
         NanoHub::sendToApp(&get_hub_info()->os_app_name, typ, data, len);
     }
     static int sendToSystem(const void *data, size_t len);

     KeyInfoSession mKeySession;
     AppMgmtSession mAppMgmtSession;
     AppInfoSession mAppInfoSession;
     MemInfoSession mMemInfoSession;

 public:
     static int handleTx(const hub_message_t *txMsg) {
         return getSystem()->doHandleTx(txMsg);
     }
     static int handleRx(const nano_message *rxMsg) {
         return getSystem()->doHandleRx(rxMsg);
     }
 };

 }; // namespace nanohub

 }; // namespace android

 #endif
	/*
	* Copyright (C) 2016 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#ifndef _NANOHUB_SYSTEM_COMMS_H_
	#define _NANOHUB_SYSTEM_COMMS_H_

	#include <utils/Condition.h>
	#include <utils/Mutex.h>

	#include <map>
	#include <vector>

	#include <hardware/context_hub.h>
	#include "nanohubhal.h"
	#include "message_buf.h"

	//rx: return 0 if handled, > 0 if not handled, < 0 if error happened

	#define MSG_HANDLED 0

	//messages to the HostIf nanoapp & their replies (mesages and replies both begin with u8 message_type)
	#define NANOHUB_EXT_APPS_ON 0 // () -> (char success)
	#define NANOHUB_EXT_APPS_OFF 1 // () -> (char success)
	#define NANOHUB_EXT_APP_DELETE 2 // (u64 name) -> (char success) //idempotent
	#define NANOHUB_QUERY_MEMINFO 3 // () -> (mem_info)
	#define NANOHUB_QUERY_APPS 4 // (u32 idxStart) -> (app_info[idxStart] OR EMPTY IF NO MORE)
	#define NANOHUB_QUERY_RSA_KEYS 5 // (u32 byteOffset) -> (u8 data[1 or more bytes] OR EMPTY IF NO MORE)
	#define NANOHUB_START_UPLOAD 6 // (char isOs, u32 totalLenToTx) -> (char success)
	#define NANOHUB_CONT_UPLOAD 7 // (u32 offset, u8 data[]) -> (char success)
	#define NANOHUB_FINISH_UPLOAD 8 // () -> (char success)
	#define NANOHUB_REBOOT 9 // () -> (char success)

	// Custom defined private messages
	#define CONTEXT_HUB_LOAD_OS (CONTEXT_HUB_TYPE_PRIVATE_MSG_BASE + 1)


	#define NANOHUB_APP_NOT_LOADED (-1)
	#define NANOHUB_APP_LOADED (0)

	#define NANOHUB_UPLOAD_CHUNK_SZ_MAX 64
	#define NANOHUB_MEM_SZ_UNKNOWN 0xFFFFFFFFUL

	namespace android {

	namespace nanohub {

	int system_comms_handle_rx(const nano_message *msg);
	int system_comms_handle_tx(const hub_message_t *outMsg);

	struct NanohubAppInfo {
	hub_app_name_t name;
	uint32_t version, flashUse, ramUse;
	} __attribute__((packed));

	struct NanohubMemInfo {
	//sizes
	uint32_t flashSz, blSz, osSz, sharedSz, eeSz;
	uint32_t ramSz;

	//use
	uint32_t blUse, osUse, sharedUse, eeUse;
	uint32_t ramUse;
	} __attribute__((packed));

	struct NanohubRsp {
	uint32_t cmd;
	int32_t status;
	NanohubRsp(MessageBuf &buf, bool no_status = false);
	};

	inline bool operator == (const hub_app_name_t &a, const hub_app_name_t &b) {
	return a.id == b.id;
	}

	inline bool operator != (const hub_app_name_t &a, const hub_app_name_t &b) {
	return !(a == b);
	}

	class SystemComm {
	private:

	/*
	* Nanohub HAL sessions
	*
	* Session is an object that can group several message exchanges with FW,
	* maintain state, and be waited for completion by someone else.
	*
	* As of this moment, since all sessions are triggered by client thread,
	* and all the exchange is happening in local worker thread, it is only possible
	* for client thread to wait on session completion.
	* Allowing sessions to wait on each other will require a worker thread pool.
	* It is now unnecessary, and not implemented.
	*/
	class ISession {
	public:
	virtual int setup(const hub_message_t *app_msg) = 0;
	virtual int handleRx(MessageBuf &buf) = 0;
	virtual int getState() const = 0; // FSM state
	virtual int getStatus() const = 0; // execution status (result code)
	virtual ~ISession() {}
	};

	class SessionManager;

	class Session : public ISession {
	friend class SessionManager;

	mutable Mutex mDoneLock; // controls condition and state transitions
	Condition mDoneWait;
	volatile int mState;

	protected:
	mutable Mutex mLock; // serializes message handling
	int32_t mStatus;

	enum {
	SESSION_INIT = 0,
	SESSION_DONE = 1,
	SESSION_USER = 2,
	};

	void complete() {
	Mutex::Autolock _l(mDoneLock);
	if (mState != SESSION_DONE) {
	mState = SESSION_DONE;
	mDoneWait.broadcast();
	}
	}
	void setState(int state) {
	if (state == SESSION_DONE) {
	complete();
	} else {
	Mutex::Autolock _l(mDoneLock);
	mState = state;
	}
	}
	public:
	Session() { mState = SESSION_INIT; mStatus = -1; }
	int getStatus() const {
	Mutex::Autolock _l(mLock);
	return mStatus;
	}
	int wait() {
	Mutex::Autolock _l(mDoneLock);
	while (mState != SESSION_DONE) {
	mDoneWait.wait(mDoneLock);
	}
	return 0;
	}
	virtual int getState() const override {
	Mutex::Autolock _l(mDoneLock);
	return mState;
	}
	virtual bool isDone() const {
	Mutex::Autolock _l(mDoneLock);
	return mState == SESSION_DONE;
	}
	virtual bool isRunning() const {
	Mutex::Autolock _l(mDoneLock);
	return mState > SESSION_DONE;
	}
	};

	class AppMgmtSession : public Session {
	enum {
	TRANSFER = SESSION_USER,
	FINISH,
	RELOAD,
	REBOOT,
	MGMT,
	};
	uint32_t mCmd; // UPLOAD_APP \| UPPLOAD_OS
	uint32_t mResult;
	std::vector<uint8_t> mData;
	uint32_t mLen;
	uint32_t mPos;

	int setupMgmt(const hub_message_t *appMsg, uint32_t cmd);
	int handleTransfer(NanohubRsp &rsp);
	int handleFinish(NanohubRsp &rsp);
	int handleReload(NanohubRsp &rsp);
	int handleReboot(NanohubRsp &rsp);
	int handleMgmt(NanohubRsp &rsp);
	public:
	AppMgmtSession() {
	mCmd = 0;
	mResult = 0;
	mPos = 0;
	mLen = 0;
	}
	virtual int handleRx(MessageBuf &buf) override;
	virtual int setup(const hub_message_t *app_msg) override;
	};

	class MemInfoSession : public Session {
	public:
	virtual int setup(const hub_message_t *app_msg) override;
	virtual int handleRx(MessageBuf &buf) override;
	};

	class KeyInfoSession : public Session {
	std::vector<uint8_t> mRsaKeyData;
	int requestRsaKeys(void);
	public:
	virtual int setup(const hub_message_t *) override;
	virtual int handleRx(MessageBuf &buf) override;
	bool haveKeys() const {
	Mutex::Autolock _l(mLock);
	return mRsaKeyData.size() > 0 && !isRunning();
	}
	};

	class AppInfoSession : public Session {
	std::vector<hub_app_info> mAppInfo;
	int requestNext();
	public:
	virtual int setup(const hub_message_t *) override;
	virtual int handleRx(MessageBuf &buf) override;
	};

	class GlobalSession : public Session {
	public:
	virtual int setup(const hub_message_t *) override;
	virtual int handleRx(MessageBuf &buf) override;
	};

	class SessionManager {
	typedef std::map<int, Session* > SessionMap;

	Mutex lock;
	SessionMap sessions_;
	GlobalSession mGlobal;

	void next(SessionMap::iterator &pos)
	{
	Mutex::Autolock _l(lock);
	pos->second->isDone() ? pos = sessions_.erase(pos) : ++pos;
	}

	public:
	SessionManager() {
	mGlobal.setup(nullptr);
	}
	int handleRx(MessageBuf &buf);
	int setup_and_add(int id, Session session, const hub_message_t appMsg) {
	Mutex::Autolock _l(lock);
	if (sessions_.count(id) == 0 && !session->isRunning()) {
	int ret = session->setup(appMsg);
	if (ret < 0) {
	session->complete();
	} else {
	sessions_[id] = session;
	}
	return ret;
	}
	return -EBUSY;
	}

	} mSessions;

	const hub_app_name_t mHostIfAppName = {
	.id = NANO_APP_ID(NANOAPP_VENDOR_GOOGLE, 0)
	};

	static SystemComm *getSystem() {
	// this is thread-safe in c++11
	static SystemComm theInstance;
	return &theInstance;
	}

	SystemComm () = default;
	~SystemComm() = default;

	int doHandleTx(const hub_message_t *txMsg);
	int doHandleRx(const nano_message *rxMsg);

	static void sendToApp(uint32_t typ, const void *data, uint32_t len) {
	if (NanoHub::messageTracingEnabled()) {
	dumpBuffer("HAL -> APP", get_hub_info()->os_app_name, typ, data, len);
	}
	NanoHub::sendToApp(&get_hub_info()->os_app_name, typ, data, len);
	}
	static int sendToSystem(const void *data, size_t len);

	KeyInfoSession mKeySession;
	AppMgmtSession mAppMgmtSession;
	AppInfoSession mAppInfoSession;
	MemInfoSession mMemInfoSession;

	public:
	static int handleTx(const hub_message_t *txMsg) {
	return getSystem()->doHandleTx(txMsg);
	}
	static int handleRx(const nano_message *rxMsg) {
	return getSystem()->doHandleRx(rxMsg);
	}
	};

	}; // namespace nanohub

	}; // namespace android

	#endif