path: root/src/usr/pnor/pnorrp.H

/* IBM_PROLOG_BEGIN_TAG                                                   */
/* This is an automatically generated prolog.                             */
/*                                                                        */
/* $Source: src/usr/pnor/pnorrp.H $                                       */
/*                                                                        */
/* OpenPOWER HostBoot Project                                             */
/*                                                                        */
/* Contributors Listed Below - COPYRIGHT 2011,2017                        */
/* [+] Google Inc.                                                        */
/* [+] International Business Machines Corp.                              */
/*                                                                        */
/*                                                                        */
/* Licensed under the Apache License, Version 2.0 (the "License");        */
/* you may not use this file except in compliance with the License.       */
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/*     http://www.apache.org/licenses/LICENSE-2.0                         */
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/* IBM_PROLOG_END_TAG                                                     */
#ifndef __PNOR_PNORRP_H
#define __PNOR_PNORRP_H
#include <pnor/pnorif.H>
#include <sys/msg.h>
#include <stdint.h>
#include <builtins.h>
#include <errl/errlentry.H>
#include <vmmconst.h>
#include <map>
#include "pnor_common.H"
#include "ffs.h"
#include <config.h>
/**
 * PNOR Resource Provider
 */
namespace PNOR
{
    // used to register for the hostboot shutdown
    // notification messages.
    enum msg_type
    {
        MSG_NOT_USED = 0x00,
        MSG_SHUTDOWN = 0x01,
    };
};
class PnorRP
{
  public:
    /**
     * @brief Static Initializer
     * @param[in]  ref to errlHndl_t
     */
    static void init( errlHndl_t &io_rtaskRetErrl );

    /**
     * @brief Returns information about a given side of pnor
     *        (Called by an external interface PNOR::getSideInfo())
     * @param[in]  i_side PNOR side
     * @param[out] o_info side information
     *
     * @return errlHndl_t Error log if request was invalid
     */
    errlHndl_t getSideInfo (PNOR::SideId i_side, PNOR::SideInfo_t& o_info);

    /**
     * @brief  Return the size and address of a given section of PNOR data
     *    Called by external PNOR::getSectionInfo()
     *
     * @param[in] i_section  PNOR section
     * @param[out] o_info  Location and size information
     *
     * @return errlHndl_t  Error log if request was invalid
     */
    errlHndl_t getSectionInfo( PNOR::SectionId i_section,
                               PNOR::SectionInfo_t& o_info );

    /**
     * @brief  Clears the specified PNOR section with all FF's (w/ good ECC)
     *
     * @param[in] i_id  PNOR section to clear
     *
     * @return Error if fails
     */
    errlHndl_t clearSection(PNOR::SectionId i_section);

    /**
     * @brief Checks and fixes correctable ECC for a given PNOR section
     *
     * @param[in] i_id  PNOR section to clear
     *
     * @return Error if fails
     */
    errlHndl_t fixECC(PNOR::SectionId i_section);

    /**
     * @brief  Get TOC offset of specified TOC and side
     *
     * @param[in] i_toc     TOC id of the TOC requested
     *
     * @return uint64_t     TOC offset
     */
    uint64_t getTocOffset(PNOR::TOCS i_toc) const;

  protected:
    /**
     * @brief  Constructor, default TOC offsets to side A
     */
    PnorRP();

    /**
     * @brief  Destructor
     */
    ~PnorRP();


  private:

    /*
     * Stores primary and backup TOCs for each side of PNOR
     */
    typedef std::pair<uint64_t, uint64_t> TocOffsets_t;
    TocOffsets_t iv_TocOffset [PNOR::NUM_SIDES];

    enum
    {
        BASE_VADDR = VMM_VADDR_PNOR_RP, /**< 2GB = 0x80000000*/
        TOTAL_SIZE = 64*MEGABYTE, /**< Allocate 64 MB (0x4000000)*/
        LAST_VADDR = BASE_VADDR + TOTAL_SIZE,  /**< End of our VA range */
    };

    /**
     * Which TOC (0 or 1) is used after verifying both.
     */
    PNOR::TOCS iv_TOC_used;

    /**
     * Flash statistics
     */
    struct FlashStats_t {
        uint8_t numWrites;  /**< Number of writes to this page */
        uint8_t numCEs;  /**< Number of ECC corrections made */
    };

    /**
     * Stores information about all sides of PNOR
     */
    PNOR::SideInfo_t iv_side[PNOR::NUM_SIDES];

    /**
     * Cached copy of section data
     */
    PNOR::SectionData_t iv_TOC[PNOR::NUM_SECTIONS+1];

    /**
     * Pointer to the message queue where we receive messages
     */
    msg_q_t iv_msgQ;

    /**
     * Remember that we failed during initial startup
     *   This is set by startup methods to indicate to constructor that
     *   something went wrong
     */
    uint64_t iv_startupRC;

    /**
     * sent when a shutdown message is sent, used to elimnate further writes
     * to pnore during a shutdown process
     */
    bool iv_shutdown_pending;

    /**
     * Track some information related to flash wear and health
     *  indexed by physical page number inside PNOR
     */
    std::map<uint64_t,FlashStats_t> iv_stats;

    /**
     * @brief Initialize the daemon, called by constructor
     */
    void initDaemon();

    /**
     * @brief Determine the TOC offsets based on the HBB address
     *        System does a shutdown if any errors detected
     *
     * @param[out] o_tocSize The size of the table of content of PNOR in bytes
     *
     * @return Error from device
     */
    errlHndl_t  findTOC(size_t & o_tocSize);

    /*
     * @brief determines the sides information and fills the class variable
     *          iv_side
     *
     * @param[in] i_tocSize The size of the table of content of PNOR in bytes
     *
     * @return Error
     */
    errlHndl_t setSideInfo(size_t i_tocSize);

    /**
     * @brief Verify both TOC's and store section information from one of the
     *        verified TOC's. Additionally set each section permissions
     *        (e.g. readOnly)
     *
     * @param[in] i_tocSize The size of the table of content of PNOR in bytes
     *
     *
     * @return Error from device
     */
    errlHndl_t readTOC(size_t i_tocSize);

    /**
     * @brief  Message receiver
     */
    void waitForMessage();

    /**
     * @brief Set the virtual addresses in the iv_TOC
     *
     * @return Any errors found while setting Virtual Addresses
     */
    errlHndl_t setVirtAddrs(void);

    /**
     * @brief  Retrieve 1 logical page of data from the PNOR device
     *
     * @param[in] i_offset  Offset into PNOR chip
     * @param[in] i_chip  Which PNOR chip
     * @param[in] i_ecc  true=apply ECC after reading
     * @param[out] o_dest  Buffer to copy data into
     * @param[out] o_fatalError  non-zero=fatal error encountered, but no
     *                    log could be created.  Value is the internal RC.
     *
     * @return Error from device
     */
    errlHndl_t readFromDevice( uint64_t i_offset,
                               uint64_t i_chip,
                               bool i_ecc,
                               void* o_dest,
                               uint64_t& o_fatalError );

    /**
     * @brief  Write 1 logical page of data to the PNOR device
     *
     * @param[in] i_offset  Offset into PNOR chip
     * @param[in] i_chip  Which PNOR chip
     * @param[in] i_ecc  true=apply ECC before writing
     * @param[in] i_src  Buffer to copy data from
     *
     * @return Error from device
     */
    errlHndl_t writeToDevice( uint64_t i_offset,
                              uint64_t i_chip,
                              bool i_ecc,
                              void* i_src );

    /**
     * @brief  Convert a virtual address into the PNOR device address
     *
     * @param[in] i_vaddr  Virtual address of page
     * @param[out] o_offset  Offset into PNOR chip
     * @param[out] o_chip  Which PNOR chip
     * @param[out] o_ecc  true=data is ECC-protected
     *
     * @return Error if VA is bad
     */
    errlHndl_t computeDeviceAddr( void* i_vaddr,
                                  uint64_t& o_offset,
                                  uint64_t& o_chip,
                                  bool& o_ecc );

    /**
     * @brief  Figure out which section a VA belongs to
     *
     * @param[in] i_vaddr  Virtual address of page
     * @param[out] o_id  Which section of PNOR
     *
     * @return Error if VA is bad
     */
    errlHndl_t computeSection( uint64_t i_vaddr,
                               PNOR::SectionId& o_id );

    /**
     * @brief  Figure out which section a PA belongs to
     *
     * @param[in] i_offset  Physical offset into PNOR
     *
     * @return Which section of PNOR, returns
     *         PNOR::INVALID_SECTION if not mapped
     */
     PNOR::SectionId computeSectionPhys( uint64_t i_offset );

    /**
     * @brief  Returns true if the initial startup failed for some reason
     * @param[out]  Return code
     * @return  true if startup failed
     */
    bool didStartupFail( uint64_t& o_rc )
    {
        if( iv_startupRC )
        {
            //@patrick : Weak consistency bug? Will need some sort of lwsync / isync coordinating reading / setting of iv_startupRC if the daemonized task could be setting this.
            o_rc = iv_startupRC;
            return true;
        }
        return false;
    };

    // allow local helper function to call private methods
    friend void* wait_for_message( void* unused );

    // allow testcase to see inside
    friend class PnorRpTest;
    friend class PnorDdTest;
    friend class SfcIBMTest;
    friend class SfcAST2400Test;
    // allow this function to use constant(s)
    friend errlHndl_t PNOR::validateAltMaster( void );

    /**
     * @brief Static instance function
     */
    static PnorRP& getInstance();
};


#endif