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author | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-05-03 13:47:34 +1000 |
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committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-05-03 13:47:34 +1000 |
commit | 1853c665f40fefd0f8629b89d2631f4653c6831a (patch) | |
tree | dd423a8a945c0d2b8e02b717e05b3a7260e2d03d /doc | |
parent | a6d5bc107e76123440d60a05698c151084604180 (diff) | |
download | skiboot-1853c665f40fefd0f8629b89d2631f4653c6831a.zip skiboot-1853c665f40fefd0f8629b89d2631f4653c6831a.tar.gz skiboot-1853c665f40fefd0f8629b89d2631f4653c6831a.tar.bz2 |
Skiboot 5.4.4 release notesskiboot-5.4.4
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'doc')
-rw-r--r-- | doc/release-notes/skiboot-5.4.4.rst | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/doc/release-notes/skiboot-5.4.4.rst b/doc/release-notes/skiboot-5.4.4.rst new file mode 100644 index 0000000..acd3747 --- /dev/null +++ b/doc/release-notes/skiboot-5.4.4.rst @@ -0,0 +1,76 @@ +.. _skiboot-5.4.4: + +============= +skiboot-5.4.4 +============= + +skiboot-5.4.4 was released on Wednesday May 3rd, 2017. It replaces +:ref:`skiboot-5.4.3` as the current stable release in the 5.4.x series. + +Over :ref:`skiboot-5.4.3`, we have a small number of bug fixes: + +- hw/fsp: Do not queue SP and SPCN class messages during reset/reload + In certain cases of communicating with the FSP (e.g. sensors), the OPAL FSP + driver returns a default code (async + completion) even though there is no known bound from the time of this error + return to the actual data being available. The kernel driver keeps waiting + leading to soft-lockup on the host side. + + Mitigate both these (known) cases by returning OPAL_BUSY so the host driver + knows to retry later. +- core/pci: Fix PCIe slot's presence + According to PCIe spec, the presence bit is hardcoded to 1 if PCIe + switch downstream port doesn't support slot capability. The register + used for the check in pcie_slot_get_presence_state() is wrong. It + should be PCIe capability register instead of PCIe slot capability + register. Otherwise, we always have present bit on the PCI topology. + + The issue is found on Supermicro's p8dtu2u machine: :: + + # lspci -t + -+-[0022:00]---00.0-[01-08]----00.0-[02-08]--+-01.0-[03]----00.0 + | \-02.0-[04-08]-- + # cat /sys/bus/pci/slots/S002204/adapter + 1 + # lspci -vvs 0022:02:02.0 + # lspci -vvs 0022:02:02.0 + 0022:02:02.0 PCI bridge: PLX Technology, Inc. PEX 8718 16-Lane, \ + 5-Port PCI Express Gen 3 (8.0 GT/s) Switch (rev ab) (prog-if 00 [Normal decode]) + : + Capabilities: [68] Express (v2) Downstream Port (Slot+), MSI 00 + : + SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet- Interlock- + Changed: MRL- PresDet- LinkState- + + This fixes the issue by checking the correct register (PCIe capability). + Also, the register's value is cached in advance as we did for slot and + link capability. +- core/pci: More reliable way to update PCI slot power state + + The power control bit (SLOT_CTL, offset: PCIe cap + 0x18) isn't + reliable enough to reflect the PCI slot's power state. Instead, + the power indication bits are more reliable comparatively. This + leads to mismatch between the cached power state and PCI slot's + presence state, resulting in the hotplug driver in kernel refuses + to unplug the devices properly on the request. The issue was + found on below NVMe card on "supermicro,p8dtu2u" machine. We don't + have this issue on the integrated PLX 8718 switch. :: + + # lspci + 0022:01:00.0 PCI bridge: PLX Technology, Inc. PEX 9733 33-lane, \ + 9-port PCI Express Gen 3 (8.0 GT/s) Switch (rev aa) + 0022:02:01.0 PCI bridge: PLX Technology, Inc. PEX 9733 33-lane, \ + 9-port PCI Express Gen 3 (8.0 GT/s) Switch (rev aa) + 0022:02:04.0 PCI bridge: PLX Technology, Inc. PEX 9733 33-lane, \ + 9-port PCI Express Gen 3 (8.0 GT/s) Switch (rev aa) + 0022:02:05.0 PCI bridge: PLX Technology, Inc. PEX 9733 33-lane, \ + 9-port PCI Express Gen 3 (8.0 GT/s) Switch (rev aa) + 0022:02:06.0 PCI bridge: PLX Technology, Inc. PEX 9733 33-lane, \ + 9-port PCI Express Gen 3 (8.0 GT/s) Switch (rev aa) + 0022:02:07.0 PCI bridge: PLX Technology, Inc. PEX 9733 33-lane, \ + 9-port PCI Express Gen 3 (8.0 GT/s) Switch (rev aa) + 0022:17:00.0 Non-Volatile memory controller: Device 19e5:0123 (rev 45) + + This updates the cached PCI slot's power state using the power + indication bits instead of power control bit, to fix above issue. +- core/pci: Avoid hreset after freset |