kernel.git/arch/s390/kernel/machine_kexec.c, branch linux-3.11.y

s390/kdump: Add PM notifier for kdump

2013-04-15T11:34:44Z

For s390 the page table mapping for the crashkernel memory is removed to protect the pre-loaded kdump kernel and ramdisk. Because the crashkernel memory is not included in the page tables for suspend/resume it is not included in the suspend image. Therefore after resume the resumed system does no longer contain the pre-loaded kdump kernel and when kdump is triggered it fails. This patch adds a PM notifier that creates the page tables before suspend is done and removes them for resume. This ensures that the kdump kernel is included in the suspend image. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky

s390/crashdump: move fill_cpu_elf_notes() prototype to header file

2012-09-26T13:45:22Z

Move fill_cpu_elf_notes() prototype to header file. This way we get compile errors if e.g. the number of function parameters get changed. Otherwise it's possible to change just the definition and everything else still compiles fine, but the result is broken code. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/kexec: change return value of machine_kexec_prepare

2012-09-26T13:45:14Z

Returning -ENOSYS on kexec_load() is a bad idea since user space cannot tell if the system call is not implmented or if it failed. Use -EOPNOTSUPP in case somebody tries a kexec_load on a NSS image based kernel instead. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/kexec: move machine_crash_shutdown() to machine_kexec.c

2012-09-26T13:44:54Z

machine_crash_shutdown() was the only function in crash.c. So move the function and delete one file. Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/comments: unify copyright messages and remove file names

2012-07-20T09:15:04Z

Remove the file name from the comment at top of many files. In most cases the file name was wrong anyway, so it's rather pointless. Also unify the IBM copyright statement. We did have a lot of sightly different statements and wanted to change them one after another whenever a file gets touched. However that never happened. Instead people start to take the old/"wrong" statements to use as a template for new files. So unify all of them in one go. Signed-off-by: Heiko Carstens

s390/kdump: Use real mode for PSW restart and kexec

2012-05-23T15:06:51Z

Currently the PSW restart handler and kexec are executed in real mode with DAT=off. For kexec/kdump the function setup_regs() is called that uses the per-cpu variable "crash_notes". Because there are situations when the per-cpu implementation uses vmalloc memory, calling setup_regs() in real mode can cause a program check interrupt. To fix that problem this patch changes the following: * Ensure that diag308_reset() does not change PSW bits to real mode * Enable DAT in __do_restart() after we switched to an online CPU * Enable DAT in __machine_kexec() after we switched to the IPL CPU * Call setup_regs() before we switch to real mode and call purgatory Reviewed-by: Martin Schwidefsky Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky

s390/kdump: Account /sys/kernel/kexec_crash_size changes in OS info

2012-05-23T15:06:51Z

The crashkernel size for kdump can be reduced at runtime with the sysfs file "/sys/kernel/kexec_crash_size". Currently those changes do not update the OS info crashkernel information that is used for stand-alone kdump. With this fix now also the OS info crashkernel information is updated correctly. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky

Disintegrate asm/system.h for S390

2012-03-28T17:30:02Z

Disintegrate asm/system.h for S390. Signed-off-by: David Howells cc: linux-s390@vger.kernel.org

[S390] kernel: Add z/VM LGR detection

2012-03-11T15:59:29Z

Currently the following mechanisms are available to move active Linux on System z instances between machines: * z/VM 6.2 SSI (Single System Image) * Suspend/resume For moving Linux instances in this patch the term LGR (Linux Guest Relocation) is used. Because such an operation is critical, it should be detectable from Linux. With this patch for both, a live system and a kernel dump, the information about LGRs is accessible. To identify a guest, stsi and stfle data is used. A new function lgr_info_log() compares the current data (lgr_info_cur) with the last recorded one (lgr_info_last). In case the two data sets differ, lgr_info_cur is logged to the "lgr" s390dbf. The following trigger points call lgr_info_log(): * panic * die * kdump * LGR timer * PSW restart * QDIO recovery * resume This patch also changes the s390dbf hex_ascii view. Now only printable ASCII characters are shown. Reviewed-by: Heiko Carstens Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky

[S390] rework smp code

2012-03-11T15:59:28Z

Define struct pcpu and merge some of the NR_CPUS arrays into it, including __cpu_logical_map, current_set and smp_cpu_state. Split smp related functions to those operating on physical cpus and the functions operating on a logical cpu number. Make the functions for physical cpus use a pointer to a struct pcpu. This hides the knowledge about cpu addresses in smp.c, entry[64].S and swsusp_asm64.S, thus remove the sigp.h header. The PSW restart mechanism is used to start secondary cpus, calling a function on an online cpu, calling a function on the ipl cpu, and for the nmi signal. Replace the different assembler functions with a single function restart_int_handler. The new entry point calls a function whose pointer is stored in the lowcore of the target cpu and it can wait for the source cpu to stop. This covers all existing use cases. Overall the code is now simpler and there are ~380 lines less code. Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky