BMC/Intel-BMC/linux.git/arch/s390/kernel/early.c, branch dev-5.2

s390: simplify disabled_wait

2019-05-02T11:54:11+00:00

The disabled_wait() function uses its argument as the PSW address when it stops the CPU with a wait PSW that is disabled for interrupts. The different callers sometimes use a specific number like 0xdeadbeef to indicate a specific failure, the early boot code uses 0 and some other calls sites use __builtin_return_address(0). At the time a dump is created the current PSW and the registers of a CPU are written to lowcore to make them avaiable to the dump analysis tool. For a CPU stopped with disabled_wait the PSW and the registers do not really make sense together, the PSW address does not point to the function the registers belong to. Simplify disabled_wait() by using _THIS_IP_ for the PSW address and drop the argument to the function. Signed-off-by: Martin Schwidefsky

s390/kernel: introduce .dma sections

2019-04-29T08:47:10+00:00

With a relocatable kernel that could reside at any place in memory, code and data that has to stay below 2 GB needs special handling. This patch introduces .dma sections for such text, data and ex_table. The sections will be part of the decompressor kernel, so they will not be relocated and stay below 2 GB. Their location is passed over to the decompressed / relocated kernel via the .boot.preserved.data section. The duald and aste for control register setup also need to stay below 2 GB, so move the setup code from arch/s390/kernel/head64.S to arch/s390/boot/head.S. The duct and linkage_stack could reside above 2 GB, but their content has to be preserved for the decompresed kernel, so they are also moved into the .dma section. The start and end address of the .dma sections is added to vmcoreinfo, for crash support, to help debugging in case the kernel crashed there. Signed-off-by: Gerald Schaefer Reviewed-by: Philipp Rudo Signed-off-by: Martin Schwidefsky

s390: enable processes for mio instructions

2019-04-29T08:47:01+00:00

Allow for userspace to use PCI MIO instructions. Signed-off-by: Sebastian Ott Signed-off-by: Martin Schwidefsky

s390: move ipl block to .boot.preserved.data section

2019-04-10T15:47:11+00:00

.boot.preserved.data is a better fit for ipl block than .boot.data which is discarded after init. Reusing .boot.preserved.data allows to simplify code a little bit and avoid copying data from .boot.data to persistent variables. Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

Merge tag 's390-5.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2019-03-05T19:13:10+00:00

Pull s390 updates from Martin Schwidefsky: - A copy of Arnds compat wrapper generation series - Pass information about the KVM guest to the host in form the control program code and the control program version code - Map IOV resources to support PCI physical functions on s390 - Add vector load and store alignment hints to improve performance - Use the "jdd" constraint with gcc 9 to make jump labels working again - Remove amode workaround for old z/VM releases from the DCSS code - Add support for in-kernel performance measurements using the CPU measurement counter facility - Introduce a new PMU device cpum_cf_diag to capture counters and store thenn as event raw data. - Bug fixes and cleanups * tag 's390-5.1-1' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (54 commits) Revert "s390/cpum_cf: Add kernel message exaplanations" s390/dasd: fix read device characteristic with CONFIG_VMAP_STACK=y s390/suspend: fix prefix register reset in swsusp_arch_resume s390: warn about clearing als implied facilities s390: allow overriding facilities via command line s390: clean up redundant facilities list setup s390/als: remove duplicated in-place implementation of stfle s390/cio: Use cpa range elsewhere within vfio-ccw s390/cio: Fix vfio-ccw handling of recursive TICs s390: vfio_ap: link the vfio_ap devices to the vfio_ap bus subsystem s390/cpum_cf: Handle EBUSY return code from CPU counter facility reservation s390/cpum_cf: Add kernel message exaplanations s390/cpum_cf_diag: Add support for s390 counter facility diagnostic trace s390/cpum_cf: add ctr_stcctm() function s390/cpum_cf: move common functions into a separate file s390/cpum_cf: introduce kernel_cpumcf_avail() function s390/cpu_mf: replace stcctm5() with the stcctm() function s390/cpu_mf: add store cpu counter multiple instruction support s390/cpum_cf: Add minimal in-kernel interface for counter measurements s390/cpum_cf: introduce kernel_cpumcf_alert() to obtain measurement alerts ...

s390: clean up redundant facilities list setup

2019-03-01T07:00:39+00:00

Facilities list in the lowcore is initially set up by verify_facilities from als.c and later initializations are redundant, so cleaning them up. Reviewed-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390/early: improve machine detection

2019-01-11T16:12:02+00:00

Right now the early machine detection code check stsi 3.2.2 for "KVM" and set MACHINE_IS_VM if this is different. As the console detection uses diagnose 8 if MACHINE_IS_VM returns true this will crash Linux early for any non z/VM system that sets a different value than KVM. So instead of assuming z/VM, do not set any of MACHINE_IS_LPAR, MACHINE_IS_VM, or MACHINE_IS_KVM. CC: stable@vger.kernel.org Reviewed-by: Heiko Carstens Signed-off-by: Christian Borntraeger Signed-off-by: Martin Schwidefsky

s390: move ipl block and cmd line handling to early boot phase

2018-10-09T09:21:14+00:00

To distinguish zfcpdump case and to be able to parse some of the kernel command line arguments early (e.g. mem=) ipl block retrieval and command line construction code is moved to the early boot phase. "memory_end" is set up correctly respecting "mem=" and hsa_size in case of the zfcpdump. arch/s390/boot/string.c is introduced to provide string handling and command line parsing functions to early boot phase code for the compressed kernel image case. Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390/boot: block uncompressed vmlinux booting attempts

2018-07-02T09:25:05+00:00

Since the plain vmlinux ELF file no longer carries all necessary parts for starting up (like the entry point and decompressor), add a check which would block boot process and encourage users to use bzImage or arch/s390/boot/compressed/vmlinux instead. The check relies on s390 linux entry point ABI definition, which is only present in bzImage and arch/s390/boot/compressed/vmlinux. Reported-by: Guenter Roeck Tested-by: Guenter Roeck Acked-by: Cornelia Huck Acked-by: Christian Borntraeger Reviewed-by: Heiko Carstens Signed-off-by: Vasily Gorbik Signed-off-by: Martin Schwidefsky

s390/early: move functions which may not access bss section to extra file

2018-05-09T08:55:01+00:00

Move functions which may not access bss section to extra file. This makes it easier to verify that all early functions which may not rely on an initialized bss section are not accessing it. Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky