skiboot-5.4.10 was released on Monday May 28th, 2018. It replaces skiboot-5.4.9 as the current stable release in the 5.4.x series.
Over skiboot-5.4.9, we have a few bug fixes:
opal-prd: Do not error out on first failure for soft/hard offline.
The memory errors (CEs and UEs) that are detected as part of background memory scrubbing are reported by PRD asynchronously to opal-prd along with affected memory ranges. hservice_memory_error() converts these ranges into page granularity before hooking up them to soft/hard offline-ing infrastructure.
But the current implementation of hservice_memory_error() does not hookup all the pages to soft/hard offline-ing if any of the page offline action fails. e.g hard offline can fail for:
Pages that are not part of buddy managed pool.
Pages that are reserved by kernel using memblock_reserved()
Pages that are in use by kernel.
But for the pages that are in use by user space application, the hard offline marks the page as hwpoison, sends SIGBUS signal to kill the affected application as recovery action and returns success.
Hence, It is possible that some of the pages in that memory range are in use by application or free. By stopping on first error we loose the opportunity to hwpoison the subsequent pages which may be free or in use by application. This patch fixes this issue.
OPAL_PCI_SET_POWER_STATE: fix locking in error paths
Otherwise we could exit OPAL holding locks, potentially leading to all sorts of problems later on.
p8-i2c: Limit number of retry attempts
Current we will attempt to start an I2C transaction until it succeeds. In the event that the OCC does not release the lock on an I2C bus this results in an async token being held forever and the kernel thread that started the transaction will block forever while waiting for an async completion message. Fix this by limiting the number of attempts to start the transaction.
FSP/CONSOLE: Disable notification on unresponsive consoles
Commit fd6b71fc fixed the situation where ipmi console was open (hvc0) but got data on different console (hvc1).
During FSP R/R OPAL closes all consoles. After R/R complete FSP requests to open hvc1 and sends data on this. If hvc1 registration failed or not opened in host kernel then it will not read data and results in RCU stalls.
Note that this is workaround for older kernel where we don’t have separate irq for each console. Latest kernel works fine without this patch.