libata: move EH docs to separate DocBook chapter

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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
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<book id="libataDevGuide">
 <bookinfo>
  <title>libATA Developer's Guide</title>
  
  <authorgroup>
   <author>
    <firstname>Jeff</firstname>
    <surname>Garzik</surname>
   </author>
  </authorgroup>

  <copyright>
   <year>2003-2005</year>
   <holder>Jeff Garzik</holder>
  </copyright>

  <legalnotice>
   <para>
   The contents of this file are subject to the Open
   Software License version 1.1 that can be found at
   <ulink url="http://www.opensource.org/licenses/osl-1.1.txt">http://www.opensource.org/licenses/osl-1.1.txt</ulink> and is included herein
   by reference.
   </para>

   <para>
   Alternatively, the contents of this file may be used under the terms
   of the GNU General Public License version 2 (the "GPL") as distributed
   in the kernel source COPYING file, in which case the provisions of
   the GPL are applicable instead of the above.  If you wish to allow
   the use of your version of this file only under the terms of the
   GPL and not to allow others to use your version of this file under
   the OSL, indicate your decision by deleting the provisions above and
   replace them with the notice and other provisions required by the GPL.
   If you do not delete the provisions above, a recipient may use your
   version of this file under either the OSL or the GPL.
   </para>

  </legalnotice>
 </bookinfo>

<toc></toc>

  <chapter id="libataIntroduction">
     <title>Introduction</title>
  <para>
  libATA is a library used inside the Linux kernel to support ATA host
  controllers and devices.  libATA provides an ATA driver API, class
  transports for ATA and ATAPI devices, and SCSI&lt;-&gt;ATA translation
  for ATA devices according to the T10 SAT specification.
  </para>
  <para>
  This Guide documents the libATA driver API, library functions, library
  internals, and a couple sample ATA low-level drivers.
  </para>
  </chapter>

  <chapter id="libataDriverApi">
     <title>libata Driver API</title>
     <para>
     struct ata_port_operations is defined for every low-level libata
     hardware driver, and it controls how the low-level driver
     interfaces with the ATA and SCSI layers.
     </para>
     <para>
     FIS-based drivers will hook into the system with ->qc_prep() and
     ->qc_issue() high-level hooks.  Hardware which behaves in a manner
     similar to PCI IDE hardware may utilize several generic helpers,
     defining at a bare minimum the bus I/O addresses of the ATA shadow
     register blocks.
     </para>
     <sect1>
        <title>struct ata_port_operations</title>

        <sect2><title>Disable ATA port</title>
        <programlisting>
void (*port_disable) (struct ata_port *);
        </programlisting>

        <para>
        Called from ata_bus_probe() and ata_bus_reset() error paths,
        as well as when unregistering from the SCSI module (rmmod, hot
        unplug).
        This function should do whatever needs to be done to take the
        port out of use.  In most cases, ata_port_disable() can be used
        as this hook.
        </para>
        <para>
        Called from ata_bus_probe() on a failed probe.
        Called from ata_bus_reset() on a failed bus reset.
        Called from ata_scsi_release().
        </para>

        </sect2>

        <sect2><title>Post-IDENTIFY device configuration</title>
        <programlisting>
void (*dev_config) (struct ata_port *, struct ata_device *);
        </programlisting>

        <para>
        Called after IDENTIFY [PACKET] DEVICE is issued to each device
        found.  Typically used to apply device-specific fixups prior to
        issue of SET FEATURES - XFER MODE, and prior to operation.
        </para>
        <para>
        Called by ata_device_add() after ata_dev_identify() determines
        a device is present.
        </para>
        <para>
        This entry may be specified as NULL in ata_port_operations.
        </para>

        </sect2>

        <sect2><title>Set PIO/DMA mode</title>
        <programlisting>
void (*set_piomode) (struct ata_port *, struct ata_device *);
void (*set_dmamode) (struct ata_port *, struct ata_device *);
void (*post_set_mode) (struct ata_port *ap);
        </programlisting>

        <para>
        Hooks called prior to the issue of SET FEATURES - XFER MODE
        command.  dev->pio_mode is guaranteed to be valid when
        ->set_piomode() is called, and dev->dma_mode is guaranteed to be
        valid when ->set_dmamode() is called.  ->post_set_mode() is
        called unconditionally, after the SET FEATURES - XFER MODE
        command completes successfully.
        </para>

        <para>
        ->set_piomode() is always called (if present), but
        ->set_dma_mode() is only called if DMA is possible.
        </para>

        </sect2>

        <sect2><title>Taskfile read/write</title>
        <programlisting>
void (*tf_load) (struct ata_port *ap, struct ata_taskfile *tf);
void (*tf_read) (struct ata_port *ap, struct ata_taskfile *tf);
        </programlisting>

        <para>
        ->tf_load() is called to load the given taskfile into hardware
        registers / DMA buffers.  ->tf_read() is called to read the
        hardware registers / DMA buffers, to obtain the current set of
        taskfile register values.
        Most drivers for taskfile-based hardware (PIO or MMIO) use
        ata_tf_load() and ata_tf_read() for these hooks.
        </para>

        </sect2>

        <sect2><title>ATA command execute</title>
        <programlisting>
void (*exec_command)(struct ata_port *ap, struct ata_taskfile *tf);
        </programlisting>

        <para>
        causes an ATA command, previously loaded with
        ->tf_load(), to be initiated in hardware.
        Most drivers for taskfile-based hardware use ata_exec_command()
        for this hook.
        </para>

        </sect2>

        <sect2><title>Per-cmd ATAPI DMA capabilities filter</title>
        <programlisting>
int (*check_atapi_dma) (struct ata_queued_cmd *qc);
        </programlisting>

        <para>
Allow low-level driver to filter ATA PACKET commands, returning a status
indicating whether or not it is OK to use DMA for the supplied PACKET
command.
        </para>
        <para>
        This hook may be specified as NULL, in which case libata will
        assume that atapi dma can be supported.
        </para>

        </sect2>

        <sect2><title>Read specific ATA shadow registers</title>
        <programlisting>
u8   (*check_status)(struct ata_port *ap);
u8   (*check_altstatus)(struct ata_port *ap);
u8   (*check_err)(struct ata_port *ap);
        </programlisting>

        <para>
        Reads the Status/AltStatus/Error ATA shadow register from
        hardware.  On some hardware, reading the Status register has
        the side effect of clearing the interrupt condition.
        Most drivers for taskfile-based hardware use
        ata_check_status() for this hook.
        </para>
        <para>
        Note that because this is called from ata_device_add(), at
        least a dummy function that clears device interrupts must be
        provided for all drivers, even if the controller doesn't
        actually have a taskfile status register.
        </para>

        </sect2>

        <sect2><title>Select ATA device on bus</title>
        <programlisting>
void (*dev_select)(struct ata_port *ap, unsigned int device);
        </programlisting>

        <para>
        Issues the low-level hardware command(s) that causes one of N
        hardware devices to be considered 'selected' (active and
        available for use) on the ATA bus.  This generally has no
        meaning on FIS-based devices.
        </para>
        <para>
        Most drivers for taskfile-based hardware use
        ata_std_dev_select() for this hook.  Controllers which do not
        support second drives on a port (such as SATA contollers) will
        use ata_noop_dev_select().
        </para>

        </sect2>

        <sect2><title>Reset ATA bus</title>
        <programlisting>
void (*phy_reset) (struct ata_port *ap);
        </programlisting>

        <para>
        The very first step in the probe phase.  Actions vary depending
        on the bus type, typically.  After waking up the device and probing
        for device presence (PATA and SATA), typically a soft reset
        (SRST) will be performed.  Drivers typically use the helper
        functions ata_bus_reset() or sata_phy_reset() for this hook.
        Many SATA drivers use sata_phy_reset() or call it from within
        their own phy_reset() functions.
        </para>

        </sect2>

        <sect2><title>Control PCI IDE BMDMA engine</title>
        <programlisting>
void (*bmdma_setup) (struct ata_queued_cmd *qc);
void (*bmdma_start) (struct ata_queued_cmd *qc);
void (*bmdma_stop) (struct ata_port *ap);
u8   (*bmdma_status) (struct ata_port *ap);
        </programlisting>

        <para>
When setting up an IDE BMDMA transaction, these hooks arm
(->bmdma_setup), fire (->bmdma_start), and halt (->bmdma_stop)
the hardware's DMA engine.  ->bmdma_status is used to read the standard
PCI IDE DMA Status register.
        </para>

        <para>
These hooks are typically either no-ops, or simply not implemented, in
FIS-based drivers.
        </para>
        <para>
Most legacy IDE drivers use ata_bmdma_setup() for the bmdma_setup()
hook.  ata_bmdma_setup() will write the pointer to the PRD table to
the IDE PRD Table Address register, enable DMA in the DMA Command
register, and call exec_command() to begin the transfer.
        </para>
        <para>
Most legacy IDE drivers use ata_bmdma_start() for the bmdma_start()
hook.  ata_bmdma_start() will write the ATA_DMA_START flag to the DMA
Command register.
        </para>
        <para>
Many legacy IDE drivers use ata_bmdma_stop() for the bmdma_stop()
hook.  ata_bmdma_stop() clears the ATA_DMA_START flag in the DMA
command register.
        </para>
        <para>
Many legacy IDE drivers use ata_bmdma_status() as the bmdma_status() hook.
        </para>

        </sect2>

        <sect2><title>High-level taskfile hooks</title>
        <programlisting>
void (*qc_prep) (struct ata_queued_cmd *qc);
int (*qc_issue) (struct ata_queued_cmd *qc);
        </programlisting>

        <para>
        Higher-level hooks, these two hooks can potentially supercede
        several of the above taskfile/DMA engine hooks.  ->qc_prep is
        called after the buffers have been DMA-mapped, and is typically
        used to populate the hardware's DMA scatter-gather table.
        Most drivers use the standard ata_qc_prep() helper function, but
        more advanced drivers roll their own.
        </para>
        <para>
        ->qc_issue is used to make a command active, once the hardware
        and S/G tables have been prepared.  IDE BMDMA drivers use the
        helper function ata_qc_issue_prot() for taskfile protocol-based
        dispatch.  More advanced drivers implement their own ->qc_issue.
        </para>
        <para>
        ata_qc_issue_prot() calls ->tf_load(), ->bmdma_setup(), and
        ->bmdma_start() as necessary to initiate a transfer.
        </para>

        </sect2>

        <sect2><title>Timeout (error) handling</title>
        <programlisting>
void (*eng_timeout) (struct ata_port *ap);
        </programlisting>

        <para>
This is a high level error handling function, called from the
error handling thread, when a command times out.  Most newer
hardware will implement its own error handling code here.  IDE BMDMA
drivers may use the helper function ata_eng_timeout().
        </para>

        </sect2>

        <sect2><title>Hardware interrupt handling</title>
        <programlisting>
irqreturn_t (*irq_handler)(int, void *, struct pt_regs *);
void (*irq_clear) (struct ata_port *);
        </programlisting>

        <para>
        ->irq_handler is the interrupt handling routine registered with
        the system, by libata.  ->irq_clear is called during probe just
        before the interrupt handler is registered, to be sure hardware
        is quiet.
        </para>
        <para>
        The second argument, dev_instance, should be cast to a pointer
        to struct ata_host_set.
        </para>
        <para>
        Most legacy IDE drivers use ata_interrupt() for the
        irq_handler hook, which scans all ports in the host_set,
        determines which queued command was active (if any), and calls
        ata_host_intr(ap,qc).
        </para>
        <para>
        Most legacy IDE drivers use ata_bmdma_irq_clear() for the
        irq_clear() hook, which simply clears the interrupt and error
        flags in the DMA status register.
        </para>

        </sect2>

        <sect2><title>SATA phy read/write</title>
        <programlisting>
u32 (*scr_read) (struct ata_port *ap, unsigned int sc_reg);
void (*scr_write) (struct ata_port *ap, unsigned int sc_reg,
                   u32 val);
        </programlisting>

        <para>
        Read and write standard SATA phy registers.  Currently only used
        if ->phy_reset hook called the sata_phy_reset() helper function.
        sc_reg is one of SCR_STATUS, SCR_CONTROL, SCR_ERROR, or SCR_ACTIVE.
        </para>

        </sect2>

        <sect2><title>Init and shutdown</title>
        <programlisting>
int (*port_start) (struct ata_port *ap);
void (*port_stop) (struct ata_port *ap);
void (*host_stop) (struct ata_host_set *host_set);
        </programlisting>

        <para>
        ->port_start() is called just after the data structures for each
        port are initialized.  Typically this is used to alloc per-port
        DMA buffers / tables / rings, enable DMA engines, and similar
        tasks.  Some drivers also use this entry point as a chance to
        allocate driver-private memory for ap->private_data.
        </para>
        <para>
        Many drivers use ata_port_start() as this hook or call
        it from their own port_start() hooks.  ata_port_start()
        allocates space for a legacy IDE PRD table and returns.
        </para>
        <para>
        ->port_stop() is called after ->host_stop().  It's sole function
        is to release DMA/memory resources, now that they are no longer
        actively being used.  Many drivers also free driver-private
        data from port at this time.
        </para>
        <para>
        Many drivers use ata_port_stop() as this hook, which frees the
        PRD table.
        </para>
        <para>
        ->host_stop() is called after all ->port_stop() calls
have completed.  The hook must finalize hardware shutdown, release DMA
and other resources, etc.
        This hook may be specified as NULL, in which case it is not called.
        </para>

        </sect2>

     </sect1>
  </chapter>

  <chapter id="libataEH">
        <title>Error handling</title>

        <para>
        This chapter describes how errors are handled under libata.
        Readers are advised to read SCSI EH
        (Documentation/scsi/scsi_eh.txt) and ATA exceptions doc first.
        </para>

        <sect1><title>Origins of commands</title>
        <para>
        In libata, a command is represented with struct ata_queued_cmd
        or qc.  qc's are preallocated during port initialization and
        repetitively used for command executions.  Currently only one
        qc is allocated per port but yet-to-be-merged NCQ branch
        allocates one for each tag and maps each qc to NCQ tag 1-to-1.
        </para>
        <para>
        libata commands can originate from two sources - libata itself
        and SCSI midlayer.  libata internal commands are used for
        initialization and error handling.  All normal blk requests
        and commands for SCSI emulation are passed as SCSI commands
        through queuecommand callback of SCSI host template.
        </para>
        </sect1>

        <sect1><title>How commands are issued</title>

        <variablelist>

        <varlistentry><term>Internal commands</term>
        <listitem>
        <para>
        First, qc is allocated and initialized using
        ata_qc_new_init().  Although ata_qc_new_init() doesn't
        implement any wait or retry mechanism when qc is not
        available, internal commands are currently issued only during
        initialization and error recovery, so no other command is
        active and allocation is guaranteed to succeed.
        </para>
        <para>
        Once allocated qc's taskfile is initialized for the command to
        be executed.  qc currently has two mechanisms to notify
        completion.  One is via qc->complete_fn() callback and the
        other is completion qc->waiting.  qc->complete_fn() callback
        is the asynchronous path used by normal SCSI translated
        commands and qc->waiting is the synchronous (issuer sleeps in
        process context) path used by internal commands.
        </para>
        <para>
        Once initialization is complete, host_set lock is acquired
        and the qc is issued.
        </para>
        </listitem>
        </varlistentry>

        <varlistentry><term>SCSI commands</term>
        <listitem>
        <para>
        All libata drivers use ata_scsi_queuecmd() as
        hostt->queuecommand callback.  scmds can either be simulated
        or translated.  No qc is involved in processing a simulated
        scmd.  The result is computed right away and the scmd is
        completed.
        </para>
        <para>
        For a translated scmd, ata_qc_new_init() is invoked to
        allocate a qc and the scmd is translated into the qc.  SCSI
        midlayer's completion notification function pointer is stored
        into qc->scsidone.
        </para>
        <para>
        qc->complete_fn() callback is used for completion
        notification.  ATA commands use ata_scsi_qc_complete() while
        ATAPI commands use atapi_qc_complete().  Both functions end up
        calling qc->scsidone to notify upper layer when the qc is
        finished.  After translation is completed, the qc is issued
        with ata_qc_issue().
        </para>
        <para>
        Note that SCSI midlayer invokes hostt->queuecommand while
        holding host_set lock, so all above occur while holding
        host_set lock.
        </para>
        </listitem>
        </varlistentry>

        </variablelist>
        </sect1>

        <sect1><title>How commands are processed</title>
        <para>
        Depending on which protocol and which controller are used,
        commands are processed differently.  For the purpose of
        discussion, a controller which uses taskfile interface and all
        standard callbacks is assumed.
        </para>
        <para>
        Currently 6 ATA command protocols are used.  They can be
        sorted into the following four categories according to how
        they are processed.
        </para>

        <variablelist>
           <varlistentry><term>ATA NO DATA or DMA</term>
           <listitem>
           <para>
           ATA_PROT_NODATA and ATA_PROT_DMA fall into this category.
           These types of commands don't require any software
           intervention once issued.  Device will raise interrupt on
           completion.
           </para>
           </listitem>
           </varlistentry>

           <varlistentry><term>ATA PIO</term>
           <listitem>
           <para>
           ATA_PROT_PIO is in this category.  libata currently
           implements PIO with polling.  ATA_NIEN bit is set to turn
           off interrupt and pio_task on ata_wq performs polling and
           IO.
           </para>
           </listitem>
           </varlistentry>

           <varlistentry><term>ATAPI NODATA or DMA</term>
           <listitem>
           <para>
           ATA_PROT_ATAPI_NODATA and ATA_PROT_ATAPI_DMA are in this
           category.  packet_task is used to poll BSY bit after
           issuing PACKET command.  Once BSY is turned off by the
           device, packet_task transfers CDB and hands off processing
           to interrupt handler.
           </para>
           </listitem>
           </varlistentry>

           <varlistentry><term>ATAPI PIO</term>
           <listitem>
           <para>
           ATA_PROT_ATAPI is in this category.  ATA_NIEN bit is set
           and, as in ATAPI NODATA or DMA, packet_task submits cdb.
           However, after submitting cdb, further processing (data
           transfer) is handed off to pio_task.
           </para>
           </listitem>
           </varlistentry>
        </variablelist>
        </sect1>

        <sect1><title>How commands are completed</title>
        <para>
        Once issued, all qc's are either completed with
        ata_qc_complete() or time out.  For commands which are handled
        by interrupts, ata_host_intr() invokes ata_qc_complete(), and,
        for PIO tasks, pio_task invokes ata_qc_complete().  In error
        cases, packet_task may also complete commands.
        </para>
        <para>
        ata_qc_complete() does the following.
        </para>

        <orderedlist>

        <listitem>
        <para>
        DMA memory is unmapped.
        </para>
        </listitem>

        <listitem>
        <para>
        ATA_QCFLAG_ACTIVE is clared from qc->flags.
        </para>
        </listitem>

        <listitem>
        <para>
        qc->complete_fn() callback is invoked.  If the return value of
        the callback is not zero.  Completion is short circuited and
        ata_qc_complete() returns.
        </para>
        </listitem>

        <listitem>
        <para>
        __ata_qc_complete() is called, which does
           <orderedlist>

           <listitem>
           <para>
           qc->flags is cleared to zero.
           </para>
           </listitem>

           <listitem>
           <para>
           ap->active_tag and qc->tag are poisoned.
           </para>
           </listitem>

           <listitem>
           <para>
           qc->waiting is claread &amp; completed (in that order).
           </para>
           </listitem>

           <listitem>
           <para>
           qc is deallocated by clearing appropriate bit in ap->qactive.
           </para>
           </listitem>

           </orderedlist>
        </para>
        </listitem>

        </orderedlist>

        <para>
        So, it basically notifies upper layer and deallocates qc.  One
        exception is short-circuit path in #3 which is used by
        atapi_qc_complete().
        </para>
        <para>
        For all non-ATAPI commands, whether it fails or not, almost
        the same code path is taken and very little error handling
        takes place.  A qc is completed with success status if it
        succeeded, with failed status otherwise.
        </para>
        <para>
        However, failed ATAPI commands require more handling as
        REQUEST SENSE is needed to acquire sense data.  If an ATAPI
        command fails, ata_qc_complete() is invoked with error status,
        which in turn invokes atapi_qc_complete() via
        qc->complete_fn() callback.
        </para>
        <para>
        This makes atapi_qc_complete() set scmd->result to
        SAM_STAT_CHECK_CONDITION, complete the scmd and return 1.  As
        the sense data is empty but scmd->result is CHECK CONDITION,
        SCSI midlayer will invoke EH for the scmd, and returning 1
        makes ata_qc_complete() to return without deallocating the qc.
        This leads us to ata_scsi_error() with partially completed qc.
        </para>

        </sect1>

        <sect1><title>ata_scsi_error()</title>
        <para>
        ata_scsi_error() is the current hostt->eh_strategy_handler()
        for libata.  As discussed above, this will be entered in two
        cases - timeout and ATAPI error completion.  This function
        calls low level libata driver's eng_timeout() callback, the
        standard callback for which is ata_eng_timeout().  It checks
        if a qc is active and calls ata_qc_timeout() on the qc if so.
        Actual error handling occurs in ata_qc_timeout().
        </para>
        <para>
        If EH is invoked for timeout, ata_qc_timeout() stops BMDMA and
        completes the qc.  Note that as we're currently in EH, we
        cannot call scsi_done.  As described in SCSI EH doc, a
        recovered scmd should be either retried with
        scsi_queue_insert() or finished with scsi_finish_command().
        Here, we override qc->scsidone with scsi_finish_command() and
        calls ata_qc_complete().
        </para>
        <para>
        If EH is invoked due to a failed ATAPI qc, the qc here is
        completed but not deallocated.  The purpose of this
        half-completion is to use the qc as place holder to make EH
        code reach this place.  This is a bit hackish, but it works.
        </para>
        <para>
        Once control reaches here, the qc is deallocated by invoking
        __ata_qc_complete() explicitly.  Then, internal qc for REQUEST
        SENSE is issued.  Once sense data is acquired, scmd is
        finished by directly invoking scsi_finish_command() on the
        scmd.  Note that as we already have completed and deallocated
        the qc which was associated with the scmd, we don't need
        to/cannot call ata_qc_complete() again.
        </para>

        </sect1>

        <sect1><title>Problems with the current EH</title>

        <itemizedlist>

        <listitem>
        <para>
        Error representation is too crude.  Currently any and all
        error conditions are represented with ATA STATUS and ERROR
        registers.  Errors which aren't ATA device errors are treated
        as ATA device errors by setting ATA_ERR bit.  Better error
        descriptor which can properly represent ATA and other
        errors/exceptions is needed.
        </para>
        </listitem>

        <listitem>
        <para>
        When handling timeouts, no action is taken to make device
        forget about the timed out command and ready for new commands.
        </para>
        </listitem>

        <listitem>
        <para>
        EH handling via ata_scsi_error() is not properly protected
        from usual command processing.  On EH entrance, the device is
        not in quiescent state.  Timed out commands may succeed or
        fail any time.  pio_task and atapi_task may still be running.
        </para>
        </listitem>

        <listitem>
        <para>
        Too weak error recovery.  Devices / controllers causing HSM
        mismatch errors and other errors quite often require reset to
        return to known state.  Also, advanced error handling is
        necessary to support features like NCQ and hotplug.
        </para>
        </listitem>

        <listitem>
        <para>
        ATA errors are directly handled in the interrupt handler and
        PIO errors in pio_task.  This is problematic for advanced
        error handling for the following reasons.
        </para>
        <para>
        First, advanced error handling often requires context and
        internal qc execution.
        </para>
        <para>
        Second, even a simple failure (say, CRC error) needs
        information gathering and could trigger complex error handling
        (say, resetting &amp; reconfiguring).  Having multiple code
        paths to gather information, enter EH and trigger actions
        makes life painful.
        </para>
        <para>
        Third, scattered EH code makes implementing low level drivers
        difficult.  Low level drivers override libata callbacks.  If
        EH is scattered over several places, each affected callbacks
        should perform its part of error handling.  This can be error
        prone and painful.
        </para>
        </listitem>

        </itemizedlist>
        </sect1>
  </chapter>

  <chapter id="libataExt">
     <title>libata Library</title>
!Edrivers/scsi/libata-core.c
  </chapter>

  <chapter id="libataInt">
     <title>libata Core Internals</title>
!Idrivers/scsi/libata-core.c
  </chapter>

  <chapter id="libataScsiInt">
     <title>libata SCSI translation/emulation</title>
!Edrivers/scsi/libata-scsi.c
!Idrivers/scsi/libata-scsi.c
  </chapter>

  <chapter id="PiixInt">
     <title>ata_piix Internals</title>
!Idrivers/scsi/ata_piix.c
  </chapter>

  <chapter id="SILInt">
     <title>sata_sil Internals</title>
!Idrivers/scsi/sata_sil.c
  </chapter>

  <chapter id="libataThanks">
     <title>Thanks</title>
  <para>
  The bulk of the ATA knowledge comes thanks to long conversations with
  Andre Hedrick (www.linux-ide.org), and long hours pondering the ATA
  and SCSI specifications.
  </para>
  <para>
  Thanks to Alan Cox for pointing out similarities 
  between SATA and SCSI, and in general for motivation to hack on
  libata.
  </para>
  <para>
  libata's device detection
  method, ata_pio_devchk, and in general all the early probing was
  based on extensive study of Hale Landis's probe/reset code in his
  ATADRVR driver (www.ata-atapi.com).
  </para>
  </chapter>

</book>