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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thank you very much, Judy and Suman, for the swift response and have the patch available.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Please start reviewing/testing the patch at your earliest convenience and provide your feedback.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thank you!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Alex<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin:0in;margin-bottom:.0001pt"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> SUMAN PRAKASH B [mailto:suman.p@samsung.com]
<br>
<b>Sent:</b> Wednesday, October 15, 2014 6:00 AM<br>
<b>To:</b> nvmewin@lists.openfabrics.org<br>
<b>Cc:</b> Alex Chang; cgps@samsung.com<br>
<b>Subject:</b> Samsung Patch for Bus Reset Enhancements<o:p></o:p></span></p>
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<pre>IT Services<o:p></o:p></pre>
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<pre><o:p> </o:p></pre>
<p>Hi Everyone,<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>We have a patch for the Bus Reset Enhancements.<o:p></o:p></p>
<p>Please find attached the source code. The password is samsung123<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>Please find the change description below - <o:p></o:p></p>
<p> <o:p></o:p></p>
<p>1. There are multiple paths in the driver that reset the controller and execute the initialization state machine. Our patch is not concerned with the majority of those paths. Aside from a few additional isolated modifications, our patch focuses on the two
paths that are supposed to be synchronous -i.e. they should not return to caller until all work is completed - but which currently are not so. They are:<o:p></o:p></p>
<p>a) NVMeResetBus (and)<br>
b) NVMeAdapterControl-> ScsiRestartAdapter<o:p></o:p></p>
<p>We have introduced a new routine NVMeReInitializeController(), which will be invoked from NVMeReseBus() and NVMeAdapterControl() - ScsiRestartAdapter. This routine will reset and initialize the controller and then complete the requests. It will not return
until the initialization state machine is complete.<o:p></o:p></p>
<p>We disallow processing of any SRB in NVMeStartIo() when NextDriverState != NVMeStateComplete. In this way we direct the PowerUp operations to be executed in NVMeAdapterControl() - ScsiRestartAdapter only. When resuming from hibernation for example, NVMeStartio()
will not process the POWER SRB. Instead, the Power Up operations will be invoked in NVMeAdapterControl()->ScsiRestartAdapter.<br>
<br>
Additionally , Miniport drivers should disregard requests to reset the bus when ntldrDump is set to TRUE in NvmeResetBus(). But current implementation processes this request.<o:p></o:p></p>
<p><br>
2. When pAE->ntldrDump is TRUE, in the NVMeMapCore2Queue() routine, the pPGT value is NULL. Hence a BSOD occurs when executing ULONG coreNum = (ULONG)(pPN->Number + pPGT->BaseProcessor). We fixed the problem by moving access to pPGT when ntldrDump is FALSE.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>3. In ProcessIo(), when IoStatus is set to NOT_SUBMITTED, the SRB is not completed. Due to this, a BSOD was occuring when executing WHCK test "DP WLK - Hot-Add - Device test". We fixed the problem by changing the code to complete SRB when IoStatus is NOT_SUBMITTED.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p>4. We changed the use of StorPortBusy()/StorPortReady() to StorPortPause()/StorPortResume(), since StorPortBusy() will not prevent new IOS from coming in once the current ones in the driver have been completed.<o:p></o:p></p>
<p> <o:p></o:p></p>
<p> <o:p></o:p></p>
<p><span class="apple-style-span"><span style="color:black">Tested the following on Win7 and Windows 2012R2.</span></span><ns0:p></ns0:p><span style="color:black"><o:p></o:p></span></p>
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<span style="color:black">- WHCK<o:p></o:p></span></p>
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<span style="color:black">- Install/Uninstall, Enable/Disable, FS Format<o:p></o:p></span></p>
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<span style="color:black">- Hibernation/Resume, Sleep/Resume<o:p></o:p></span></p>
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<span style="color:black">- IOmeter<o:p></o:p></span></p>
<p> <o:p></o:p></p>
<p>Thanks,<o:p></o:p></p>
<p>Suman<o:p></o:p></p>
<p> <o:p></o:p></p>
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