AuxXxilium/linux_dsm_epyc7002
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966f53e750
linux_dsm_epyc7002/arch/s390/include/asm
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Harald Freudenberger 966f53e750 s390/archrandom: Rework arch random implementation. 
The arch_get_random_seed_long() invocation done by the random device
driver is done in interrupt context and may be invoked very very
frequently. The existing s390 arch_get_random_seed*() implementation
uses the PRNO(TRNG) instruction which produces excellent high quality
entropy but is relatively slow and thus expensive.

This fix reworks the arch_get_random_seed* implementation. It
introduces a buffer concept to decouple the delivery of random data
via arch_get_random_seed*() from the generation of new random
bytes. The buffer of random data is filled asynchronously by a
workqueue thread.
If there are enough bytes in the buffer the s390_arch_random_generate()
just delivers these bytes. Otherwise false is returned until the worker
thread refills the buffer.
The worker fills the rng buffer by pulling fresh entropy from the
high quality (but slow) true hardware random generator. This entropy
is then spread over the buffer with an pseudo random generator.
As the arch_get_random_seed_long() fetches 8 bytes and the calling
function add_interrupt_randomness() counts this as 1 bit entropy the
distribution needs to make sure there is in fact 1 bit entropy
contained in 8 bytes of the buffer. The current values pull 32 byte
entropy and scatter this into a 2048 byte buffer. So 8 byte in the
buffer will contain 1 bit of entropy.
The worker thread is rescheduled based on the charge level of the
buffer but at least with 500 ms delay to avoid too much cpu consumption.
So the max. amount of rng data delivered via arch_get_random_seed is
limited to 4Kb per second.

Signed-off-by: Harald Freudenberger <freude@de.ibm.com>
Reviewed-by: Patrick Steuer <patrick.steuer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2018-05-30 11:18:04 +02:00
..
fpu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
airq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
alternative-asm.h s390: add assembler macros for CPU alternatives 2018-03-28 08:38:27 +02:00
alternative.h s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
ap.h s390/zcrypt: Support up to 256 crypto adapters. 2018-04-11 10:36:27 +02:00
appldata.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
archrandom.h s390/archrandom: Rework arch random implementation. 2018-05-30 11:18:04 +02:00
asm-prototypes.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
atomic_ops.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
atomic.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
barrier.h s390: add optimized array_index_mask_nospec 2018-02-05 07:51:41 +01:00
bitops.h s390/bitops: add test_and_clear_bit_inv() 2018-01-26 10:47:38 +01:00
bug.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
bugs.h s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
cache.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ccwdev.h s390/cio: add helper to query utility strings per given ccw device 2018-05-23 08:06:56 +02:00
ccwgroup.h s390/cio: add test for ccwgroup device 2018-05-23 08:06:58 +02:00
checksum.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
chpid.h s390/cio: rename struct channel_path_desc 2018-03-26 16:13:11 +02:00
cio.h s390: assume diag308 set always works 2018-04-10 07:38:59 +02:00
clp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cmb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cmpxchg.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
compat.h signal: unify compat_siginfo_t 2018-01-15 17:40:31 -06:00
cpacf.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
cpcmd.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpu_mf.h s390/cpum_sf: Add data entry sizes to sampling trailer entry 2018-05-09 10:55:00 +02:00
cpu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cpufeature.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cputime.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
crw.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
css_chars.h s390/chsc: query utility strings via fmt3 channel path descriptor 2018-03-26 16:13:16 +02:00
ctl_reg.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
current.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
debug.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
delay.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
diag.h s390/diag: add diag26c support for VNIC info 2018-01-02 13:52:23 -05:00
dis.h s390/tools: generate header files in arch/s390/include/generated/ 2018-01-23 07:36:53 +01:00
dma.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
dwarf.h s390/vdso: revise CFI annotations of vDSO functions 2017-12-13 10:51:36 +01:00
eadm.h s390/eadm: fix CONFIG_BLOCK include dependency 2018-02-02 10:47:14 +01:00
ebcdic.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
elf.h s390: revert ELF_ET_DYN_BASE base changes 2017-11-24 16:37:01 +01:00
exec.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
extable.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
extmem.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
facility.h s390/alternative: use a copy of the facility bit mask 2018-02-05 13:49:16 +01:00
fcx.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ftrace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
futex.h s390: remove all code using the access register mode 2017-11-14 11:01:47 +01:00
gmap.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hardirq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hugetlb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hw_irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idals.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idle.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
io.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ipl.h s390/ipl: correct kdump reipl block checksum calculation 2018-04-10 07:39:00 +02:00
irq.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
irqflags.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
isc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
itcw.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
jump_label.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kbuild The core framework has a handful of patches this time around, mostly due 2018-02-01 16:56:07 -08:00
kdebug.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
kexec.h s390/kexec_file: Add ELF loader 2018-04-16 09:10:23 +02:00
kprobes.h s390: include: Remove redundant license text 2017-11-24 15:37:22 +01:00
kvm_host.h KVM: s390: provide counters for all interrupt injects/delivery 2018-03-14 19:21:18 +00:00
kvm_para.h KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED 2018-03-06 18:40:44 +01:00
linkage.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
livepatch.h s390: include: Remove redundant license text 2017-11-24 15:37:22 +01:00
lowcore.h s390: introduce execute-trampolines for branches 2018-02-07 15:57:02 +01:00
mmu_context.h ARM: 2018-04-09 11:42:31 -07:00
mmu.h KVM: s390: Refactor host cmma and pfmfi interpretation controls 2018-03-09 09:44:17 +00:00
mmzone.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
module.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
nmi.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
nospec-branch.h s390: correct nospec auto detection init order 2018-04-11 17:46:00 +02:00
nospec-insn.h s390: extend expoline to BC instructions 2018-05-07 21:12:42 +02:00
numa.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
os_info.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page-states.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
page.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci_clp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci_debug.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
pci_dma.h s390: move s390_pci_dma_ops to asm/pci_dma.h 2018-01-10 16:41:19 +01:00
pci_insn.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
pci_io.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
percpu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
perf_event.h s390/bpf: correct broken uapi for BPF_PROG_TYPE_PERF_EVENT program type 2017-12-05 15:02:41 +01:00
pgalloc.h s390/mm: provide base_asce_alloc() / base_asce_free() helper functions 2018-02-22 15:31:23 +01:00
pgtable.h s390/mm: modify pmdp_invalidate to return old value. 2018-01-31 17:18:38 -08:00
pkey.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pnet.h s390/net: add pnetid support 2018-05-30 11:18:03 +02:00
preempt.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
processor.h s390: run user space and KVM guests with modified branch prediction 2018-02-05 14:48:50 +01:00
ptrace.h s390/bpf: correct broken uapi for BPF_PROG_TYPE_PERF_EVENT program type 2017-12-05 15:02:41 +01:00
purgatory.h s390/kexec_file: add declaration of purgatory related globals 2018-04-27 06:51:31 +02:00
qdio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
runtime_instr.h s390/runtime instrumentation: provide uapi header file 2018-02-02 10:47:15 +01:00
schid.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sclp.h s390/sclp: expose the GISA format facility 2018-01-26 14:13:57 +01:00
scsw.h s390: fix comment for scsw_cmd_is_valid_sctl 2018-02-22 15:31:24 +01:00
seccomp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sections.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
segment.h s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
serial.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
set_memory.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
setup.h s390/kexec_file: Prepare setup.h for kexec_file_load 2018-04-16 09:10:21 +02:00
shmparam.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
signal.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sigp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
sparsemem.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spinlock_types.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
spinlock.h Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 12:38:26 -08:00
stp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
string.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2017-11-13 11:47:01 -08:00
switch_to.h s390: always save and restore all registers on context switch 2017-12-05 07:51:08 +01:00
syscall.h s390: include: Remove redundant license text 2017-11-24 15:37:22 +01:00
sysinfo.h s390/sysinfo: add and display licensed internal code identifier 2018-02-02 10:47:15 +01:00
termios.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
thread_info.h s390: update sampling tag after task pid change 2018-04-23 07:57:17 +02:00
timex.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tlb.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tlbflush.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
topology.h s390/topology: fix compile error in file arch/s390/kernel/smp.c 2017-11-20 08:51:01 +01:00
uaccess.h s390: remove all code using the access register mode 2017-11-14 11:01:47 +01:00
unistd.h s390/syscalls: use generated syscall_table.h and unistd.h header files 2018-01-23 07:36:52 +01:00
uprobes.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
user.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vdso.h s390/vdso: add missing boot_vdso_data declaration 2017-11-14 22:07:49 +01:00
vga.h s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
vtime.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vtimer.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vx-insn.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xor.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00