skiboot 5.10.3 release notesv5.10.3

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

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+.. _skiboot-5.10.3:
+
+==============
+skiboot-5.10.3
+==============
+
+skiboot 5.10.3 was released on Thursday March 28th, 2018. It replaces
+:ref:`skiboot-5.10.2` as the current stable release in the 5.10.x series.
+
+It is recommended that 5.10.3 be used instead of any previous 5.10.x version
+due to the bug fixes and debugging enhancements in it.
+
+Over :ref:`skiboot-5.10.2`, we have a few improvements and bug fixes:
+
+- NPU2: dump NPU2 registers on npu2 HMI
+
+  Due to the nature of debugging npu2 issues, folk are wanting the
+  full list of NPU2 registers dumped when there's a problem.
+
+  This is different than the solution introduced in 5.10.1
+  as there we would dump the registers in a way that would trigger a FIR
+  bit that would confuse PRD.
+- npu2: Add performance tuning SCOM inits
+
+  Peer-to-peer GPU bandwidth latency testing has produced some tunable
+  values that improve performance. Add them to our device initialization.
+
+  File these under things that need to be cleaned up with nice #defines
+  for the register names and bitfields when we get time.
+
+  A few of the settings are dependent on the system's particular NVLink
+  topology, so introduce a helper to determine how many links go to a
+  single GPU.
+- hw/npu2: Assign a unique LPARSHORTID per GPU
+
+  This gets used elsewhere to index items in the XTS tables.
+- occ: Set up OCC messaging even if we fail to setup pstates
+
+  This means that we no longer hit this bug if we fail to get valid pstates
+  from the OCC. ::
+
+    [console-pexpect]#echo 1 > //sys/firmware/opal/sensor_groups//occ-csm0/clear
+    echo 1 > //sys/firmware/opal/sensor_groups//occ-csm0/clear
+    [   94.019971181,5] CPU ATTEMPT TO RE-ENTER FIRMWARE! PIR=083d cpu @0x33cf4000 -> pir=083d token=8
+    [   94.020098392,5] CPU ATTEMPT TO RE-ENTER FIRMWARE! PIR=083d cpu @0x33cf4000 -> pir=083d token=8
+    [   10.318805] Disabling lock debugging due to kernel taint
+    [   10.318808] Severe Machine check interrupt [Not recovered]
+    [   10.318812]   NIP [000000003003e434]: 0x3003e434
+    [   10.318813]   Initiator: CPU
+    [   10.318815]   Error type: Real address [Load/Store (foreign)]
+    [   10.318817] opal: Hardware platform error: Unrecoverable Machine Check exception
+    [   10.318821] CPU: 117 PID: 2745 Comm: sh Tainted: G   M             4.15.9-openpower1 #3
+    [   10.318823] NIP:  000000003003e434 LR: 000000003003025c CTR: 0000000030030240
+    [   10.318825] REGS: c00000003fa7bd80 TRAP: 0200   Tainted: G   M              (4.15.9-openpower1)
+    [   10.318826] MSR:  9000000000201002 <SF,HV,ME,RI>  CR: 48002888  XER: 20040000
+    [   10.318831] CFAR: 0000000030030258 DAR: 394a00147d5a03a6 DSISR: 00000008 SOFTE: 1
+- core/fast-reboot: disable fast reboot upon fundamental entry/exit/locking errors
+
+  This disables fast reboot in several more cases where serious errors
+  like lock corruption or call re-entrancy are detected.
+- core/opal: allow some re-entrant calls
+
+  This allows a small number of OPAL calls to succeed despite re-entering
+  the firmware, and rejects others rather than aborting.
+
+  This allows a system reset interrupt that interrupts OPAL to do something
+  useful. Sreset other CPUs, use the console, which allows xmon to work or
+  stack traces to be printed, reboot the system.
+
+  Use OPAL_INTERNAL_ERROR when rejecting, rather than OPAL_BUSY, which is
+  used for many other things that does not mean a serious permanent error.
+- core/opal: abort in case of re-entrant OPAL call
+
+  The stack is already destroyed by the time we get here, so there
+  is not much point continuing.
+- npu2: Disable fast reboot
+
+  Fast reboot does not yet work right with the NPU. It's been disabled on
+  NVLink and OpenCAPI machines. Do the same for NVLink2.
+
+  This amounts to a port of 3e4577939bbf ("npu: Fix broken fast reset")
+  from the npu code to npu2.