skiboot-5.1.1 release notesskiboot-5.1.1

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

1 files changed, 41 insertions, 0 deletions

diff --git a/doc/release-notes/skiboot-5.1.1.txt b/doc/release-notes/skiboot-5.1.1.txt
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+skiboot-5.1.1
+-------------
+
+skiboot-5.1.1 was released on August 18th, 2015.
+
+skiboot-5.1.1 is the send stable release of 5.1, it follows skiboot-5.1.0.
+
+Skiboot 5.1.1 contains all fixes from skiboot-5.1.0 and is a minor bugfix
+release.
+
+Over skiboot-5.1.0, we have the following changes:
+- Fix detection of compiler options on ancient GCC (e.g. gcc 4.4, shipped with
+  RHEL6)
+- ensure the GNUC version defines for GCOV are coming from target CC rather
+  than host CC for extract-gcov
+- phb3: Continue CAPP setup even if PHB is already in CAPP mode
+  This fixes a critical bug in CAPI support.
+
+  CAPI requires that all faults are escalated into a fence, not a
+  freeze. This is done by setting bits in a number of MMIO
+  registers. phb3_set_capi_mode() calls phb3_init_capp_errors() to do
+  this. However, if the PHB is already in CAPP mode - for example in the
+  recovery case - phb3_set_capi_mode() will bail out early, and those
+  registers will not be set.
+
+  This is quite easy to verify. PCI config space access errors, for
+  example, normally cause a freeze. On a CAPI-mode PHB, they should
+  cause a fence. Say we have a CAPI card on PHB 0, and we inject a
+  PCI config space error:
+
+  echo 0x8000000000000000 > /sys/kernel/debug/powerpc/PCI0000/err_injct_inboundA;
+  lspci;
+
+  The first time we inject this, the PHB will fence and recover, but
+  won't reset the registers. Therefore, the second time we inject it,
+  we will incorrectly freeze, not fence.
+
+  Worse, the recovery for the resultant EEH freeze event interacts
+  poorly with the CAPP, triggering an EEH recovery of the PHB. The
+  combination of the two attempted recoveries will get the PHB into
+  an inoperable state.