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/*
* Copyright (c) 2013-2015 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Rene de Jong
*/
#ifndef __DEV_ARM_FLASH_DEVICE_HH__
#define __DEV_ARM_FLASH_DEVICE_HH__
#include <deque>
#include "base/statistics.hh"
#include "debug/FlashDevice.hh"
#include "dev/arm/abstract_nvm.hh"
#include "enums/DataDistribution.hh"
#include "params/FlashDevice.hh"
#include "sim/serialize.hh"
/**
* Flash Device model
* The Flash Device model is a timing model for a NAND flash device.
* It doesn't tranfer any data
*/
class FlashDevice : public AbstractNVM
{
public:
/** Initialize functions*/
FlashDevice(const FlashDeviceParams*);
~FlashDevice();
/** Checkpoint functions*/
DrainState drain() override;
void checkDrain();
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
private:
/** Defines the possible actions to the flash*/
enum Actions {
ActionRead,
ActionWrite,
ActionErase,
/**
* A copy involves taking all the used pages from a block and store
* it in another
*/
ActionCopy
};
/** Every logical address maps to a physical block and a physical page*/
struct PageMapEntry {
uint32_t page;
uint32_t block;
};
struct CallBackEntry {
Tick time;
Callback *function;
};
struct FlashDeviceStats {
/** Amount of GC activations*/
Stats::Scalar totalGCActivations;
/** Histogram of address accesses*/
Stats::Histogram writeAccess;
Stats::Histogram readAccess;
Stats::Histogram fileSystemAccess;
/** Histogram of access latencies*/
Stats::Histogram writeLatency;
Stats::Histogram readLatency;
};
/** Device access functions Inherrited from AbstractNVM*/
void initializeMemory(uint64_t disk_size, uint32_t sector_size) override
{
initializeFlash(disk_size, sector_size);
}
void readMemory(uint64_t address, uint32_t amount,
Callback *event) override
{
accessDevice(address, amount, event, ActionRead);
}
void writeMemory(uint64_t address, uint32_t amount,
Callback *event) override
{
accessDevice(address, amount, event, ActionWrite);
}
/**Initialization function; called when all disk specifics are known*/
void initializeFlash(uint64_t disk_size, uint32_t sector_size);
/**Flash action function*/
void accessDevice(uint64_t address, uint32_t amount, Callback *event,
Actions action);
/** Event rescheduler*/
void actionComplete();
/** FTL functionality */
Tick remap(uint64_t logic_page_addr);
/** Access time calculator*/
Tick accessTimes(uint64_t address, Actions accesstype);
/** Function to indicate that a page is known*/
void clearUnknownPages(uint32_t index);
/** Function to test if a page is known*/
bool getUnknownPages(uint32_t index);
/**Stats register function*/
void regStats() override;
/** Disk sizes in bytes */
uint64_t diskSize;
const uint32_t blockSize;
const uint32_t pageSize;
/** Garbage collection algorithm emulator */
const uint32_t GCActivePercentage;
/** Access latencies */
const Tick readLatency;
const Tick writeLatency;
const Tick eraseLatency;
/** Flash organization */
const Enums::DataDistribution dataDistribution;
const uint32_t numPlanes;
/** RequestHandler stats */
struct FlashDeviceStats stats;
/** Disk dimensions in pages and blocks */
uint32_t pagesPerBlock;
uint32_t pagesPerDisk;
uint32_t blocksPerDisk;
uint32_t planeMask;
/**
* when the disk is first started we are unsure of the number of
* used pages, this variable will help determining what we do know.
*/
std::vector<uint32_t> unknownPages;
/** address to logic place has a block and a page field*/
std::vector<struct PageMapEntry> locationTable;
/** number of valid entries per block*/
std::vector<uint32_t> blockValidEntries;
/** number of empty entries*/
std::vector<uint32_t> blockEmptyEntries;
/**This vector of queues keeps track of all the callbacks per plane*/
std::vector<std::deque<struct CallBackEntry> > planeEventQueue;
/** Completion event */
EventFunctionWrapper planeEvent;
};
#endif //__DEV_ARM_FLASH_DEVICE_HH__
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