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author | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-06-14 16:46:02 +1000 |
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committer | Stewart Smith <stewart@linux.vnet.ibm.com> | 2017-06-14 16:46:02 +1000 |
commit | cf81313413067463d312198b7bf74c654a8f4396 (patch) | |
tree | a4f5962e07c3a544eed966b073b83d8198de8c92 /doc | |
parent | 316f99bdb4e0911c2d3970a8ca23f30101dba57a (diff) | |
download | skiboot-cf81313413067463d312198b7bf74c654a8f4396.zip skiboot-cf81313413067463d312198b7bf74c654a8f4396.tar.gz skiboot-cf81313413067463d312198b7bf74c654a8f4396.tar.bz2 |
Add skiboot-5.4.6 release notesskiboot-5.4.6
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Diffstat (limited to 'doc')
-rw-r--r-- | doc/release-notes/skiboot-5.4.6.rst | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/doc/release-notes/skiboot-5.4.6.rst b/doc/release-notes/skiboot-5.4.6.rst new file mode 100644 index 0000000..20173a0 --- /dev/null +++ b/doc/release-notes/skiboot-5.4.6.rst @@ -0,0 +1,117 @@ +.. _skiboot-5.4.6: + +============= +skiboot-5.4.6 +============= + +skiboot-5.4.6 was released on Wednesday June 14th, 2017. It replaces +:ref:`skiboot-5.4.5` as the current stable release in the 5.4.x series. + +Over :ref:`skiboot-5.4.5`, we have a small number of bug fixes for +FSP based platforms: + +- FSP/CONSOLE: Workaround for unresponsive ipmi daemon + + In some corner cases, where FSP is active but not responding to + console MBOX message (due to buggy IPMI) and we have heavy console + write happening from kernel, then eventually our console buffer + becomes full. At this point OPAL starts sending OPAL_BUSY_EVENT to + kernel. Kernel will keep on retrying. This is creating kernel soft + lockups. In some extreme case when every CPU is trying to write to + console, user will not be able to ssh and thinks system is hang. + + If we reset FSP or restart IPMI daemon on FSP, system recovers and + everything becomes normal. + + This patch adds workaround to above issue by returning OPAL_HARDWARE + when cosole is full. Side effect of this patch is, we may endup dropping + latest console data. But better to drop console data than system hang. + + Alternative approach is to drop old data from console buffer, make space + for new data. But in normal condition only FSP can update 'next_out' + pointer and if we touch that pointer, it may introduce some other + race conditions. Hence we decided to just new console write request. + +- FSP: Set status field in response message for timed out message + + For timed out FSP messages, we set message status as "fsp_msg_timeout". + But most FSP driver users (like surviellance) are ignoring this field. + They always look for FSP returned status value in callback function + (second byte in word1). So we endup treating timed out message as success + response from FSP. + + Sample output: :: + + [69902.432509048,7] SURV: Sending the heartbeat command to FSP + [70023.226860117,4] FSP: Response from FSP timed out, word0 = d66a00d7, word1 = 0 state: 3 + .... + [70023.226901445,7] SURV: Received heartbeat acknowledge from FSP + [70023.226903251,3] FSP: fsp_trigger_reset() entry + + Here SURV code thought it got valid response from FSP. But actually we didn't + receive response from FSP. + +- FSP: Improve timeout message + + Presently we print word0 and word1 in error log. word0 contains + sequence number and command class. One has to understand word0 + format to identify command class. + + Lets explicitly print command class, sub command etc. + +- FSP/RTC: Remove local fsp_in_reset variable + + Now that we are using fsp_in_rr() to detect FSP reset/reload, fsp_in_reset + become redundant. Lets remove this local variable. + +- FSP/RTC: Fix possible FSP R/R issue in rtc write path + + fsp_opal_rtc_write() checks FSP status before queueing message to FSP. But if + FSP R/R starts before getting response to queued message then we will continue + to return OPAL_BUSY_EVENT to host. In some extreme condition host may + experience hang. Once FSP is back we will repost message, get response from FSP + and return OPAL_SUCCESS to host. + + This patch caches new values and returns OPAL_SUCCESS if FSP R/R is happening. + And once FSP is back we will send cached value to FSP. + +- hw/fsp/rtc: read/write cached rtc tod on fsp hir. + + Currently fsp-rtc reads/writes the cached RTC TOD on an fsp + reset. Use latest fsp_in_rr() function to properly read the cached rtc + value when fsp reset initiated by the hir. + + Below is the kernel trace when we set hw clock, when hir process starts. :: + + [ 1727.775824] NMI watchdog: BUG: soft lockup - CPU#57 stuck for 23s! [hwclock:7688] + [ 1727.775856] Modules linked in: vmx_crypto ibmpowernv ipmi_powernv uio_pdrv_genirq ipmi_devintf powernv_op_panel uio ipmi_msghandler powernv_rng leds_powernv ip_tables x_tables autofs4 ses enclosure scsi_transport_sas crc32c_vpmsum lpfc ipr tg3 scsi_transport_fc + [ 1727.775883] CPU: 57 PID: 7688 Comm: hwclock Not tainted 4.10.0-14-generic #16-Ubuntu + [ 1727.775883] task: c000000fdfdc8400 task.stack: c000000fdfef4000 + [ 1727.775884] NIP: c00000000090540c LR: c0000000000846f4 CTR: 000000003006dd70 + [ 1727.775885] REGS: c000000fdfef79a0 TRAP: 0901 Not tainted (4.10.0-14-generic) + [ 1727.775886] MSR: 9000000000009033 <SF,HV,EE,ME,IR,DR,RI,LE> + [ 1727.775889] CR: 28024442 XER: 20000000 + [ 1727.775890] CFAR: c00000000008472c SOFTE: 1 + GPR00: 0000000030005128 c000000fdfef7c20 c00000000144c900 fffffffffffffff4 + GPR04: 0000000028024442 c00000000090540c 9000000000009033 0000000000000000 + GPR08: 0000000000000000 0000000031fc4000 c000000000084710 9000000000001003 + GPR12: c0000000000846e8 c00000000fba0100 + [ 1727.775897] NIP [c00000000090540c] opal_set_rtc_time+0x4c/0xb0 + [ 1727.775899] LR [c0000000000846f4] opal_return+0xc/0x48 + [ 1727.775899] Call Trace: + [ 1727.775900] [c000000fdfef7c20] [c00000000090540c] opal_set_rtc_time+0x4c/0xb0 (unreliable) + [ 1727.775901] [c000000fdfef7c60] [c000000000900828] rtc_set_time+0xb8/0x1b0 + [ 1727.775903] [c000000fdfef7ca0] [c000000000902364] rtc_dev_ioctl+0x454/0x630 + [ 1727.775904] [c000000fdfef7d40] [c00000000035b1f4] do_vfs_ioctl+0xd4/0x8c0 + [ 1727.775906] [c000000fdfef7de0] [c00000000035bab4] SyS_ioctl+0xd4/0xf0 + [ 1727.775907] [c000000fdfef7e30] [c00000000000b184] system_call+0x38/0xe0 + [ 1727.775908] Instruction dump: + [ 1727.775909] f821ffc1 39200000 7c832378 91210028 38a10020 39200000 38810028 f9210020 + [ 1727.775911] 4bfffe6d e8810020 80610028 4b77f61d <60000000> 7c7f1b78 3860000a 2fbffff4 + + This is found when executing the `op-test-framework fspresetReload testcase <https://github.com/open-power/op-test-framework/blob/master/testcases/fspresetReload.py>`_ + + With this fix ran fsp hir torture testcase in the above test + which is working fine. + +- FSP/CHIPTOD: Return false in error path |