s390: Add z17 elf platform

Add detection for machine types 0x9175 and 0x9176 and set ELF platform
name to z17.

Reviewed-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <gor@linu

s390: Add z17 elf platform

Add detection for machine types 0x9175 and 0x9176 and set ELF platform
name to z17.

Reviewed-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>

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s390/tx: Convert MACHINE_HAS_TE to machine_has_tx()

Use static branch(es) to implement and use machine_has_tx() instead of
a runtime check with MACHINE_HAS_TE.

Reviewed-by: Vasily Gorbik <gor@linux

s390/tx: Convert MACHINE_HAS_TE to machine_has_tx()

Use static branch(es) to implement and use machine_has_tx() instead of
a runtime check with MACHINE_HAS_TE.

Reviewed-by: Vasily Gorbik <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

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s390/pci: Get rid of MACHINE_HAS_PCI_MIO

Remove MACHINE_FLAG_PCI_MIO/MACHINE_HAS_PCI_MIO and implement the identical
functionality with set_machine_feature(), clear_machine_feature() and
test_machin

s390/pci: Get rid of MACHINE_HAS_PCI_MIO

Remove MACHINE_FLAG_PCI_MIO/MACHINE_HAS_PCI_MIO and implement the identical
functionality with set_machine_feature(), clear_machine_feature() and
test_machine_feature().

Acked-by: Niklas Schnelle <[email protected]>
Tested-by: Niklas Schnelle <[email protected]>
Reviewed-by: Vasily Gorbik <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

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s390/cpufeature: Convert MACHINE_HAS_EDAT1 to cpu_has_edat1()

Convert MACHINE_HAS_... to cpu_has_...() which uses test_facility() instead
of testing the machine_flags lowcore member if the feature i

s390/cpufeature: Convert MACHINE_HAS_EDAT1 to cpu_has_edat1()

Convert MACHINE_HAS_... to cpu_has_...() which uses test_facility() instead
of testing the machine_flags lowcore member if the feature is present.

test_facility() generates better code since it results in a static branch
without accessing memory. The branch is patched via alternatives by the
decompressor depending on the availability of the required facility.

Reviewed-by: Vasily Gorbik <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

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s390/cpufeature: Convert MACHINE_HAS_GS to cpu_has_gs()

Convert MACHINE_HAS_... to cpu_has_...() which uses test_facility() instead
of testing the machine_flags lowcore member if the feature is pres

s390/cpufeature: Convert MACHINE_HAS_GS to cpu_has_gs()

Convert MACHINE_HAS_... to cpu_has_...() which uses test_facility() instead
of testing the machine_flags lowcore member if the feature is present.

test_facility() generates better code since it results in a static branch
without accessing memory. The branch is patched via alternatives by the
decompressor depending on the availability of the required facility.

Reviewed-by: Vasily Gorbik <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

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s390: switch stop_machine_yield() to using cpumask_next_wrap()

Calling cpumask_next_wrap_old() with starting CPU equal to wrapping CPU
effectively means the request to find next CPU, wrapping around

s390: switch stop_machine_yield() to using cpumask_next_wrap()

Calling cpumask_next_wrap_old() with starting CPU equal to wrapping CPU
effectively means the request to find next CPU, wrapping around if needed.

cpumask_next_wrap() is the proper replacement for that.

Signed-off-by: Yury Norov <[email protected]>

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cpumask: deprecate cpumask_next_wrap()

The next patch aligns implementation of cpumask_next_wrap() with the
find_next_bit_wrap(), and it changes function signature.

To make the transition smooth, t

cpumask: deprecate cpumask_next_wrap()

The next patch aligns implementation of cpumask_next_wrap() with the
find_next_bit_wrap(), and it changes function signature.

To make the transition smooth, this patch deprecates current
implementation by adding an _old suffix. The following patches switch
current users to the new implementation one by one.

No functional changes were intended.

Signed-off-by: Yury Norov <[email protected]>

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s390/alternatives: Move text sync functions

Move all text sync functions from alternative.c to processor.c. This
way there is only minimal code left in alternative.c left, which is a
prerequisite to

s390/alternatives: Move text sync functions

Move all text sync functions from alternative.c to processor.c. This
way there is only minimal code left in alternative.c left, which is a
prerequisite to use the C file within boot code as well.

Reviewed-by: Alexander Gordeev <[email protected]>
Tested-by: Sven Schnelle <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

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s390/fpu: get rid of MACHINE_HAS_VX

Get rid of MACHINE_HAS_VX and replace it with cpu_has_vx() which is a
short readable wrapper for "test_facility(129)".

Facility bit 129 is set if the vector faci

s390/fpu: get rid of MACHINE_HAS_VX

Get rid of MACHINE_HAS_VX and replace it with cpu_has_vx() which is a
short readable wrapper for "test_facility(129)".

Facility bit 129 is set if the vector facility is present. test_facility()
returns also true for all bits which are set in the architecture level set
of the cpu that the kernel is compiled for. This means that
test_facility(129) is a compile time constant which returns true for z13
and later, since the vector facility bit is part of the z13 kernel ALS.

In result the compiled code will have less runtime checks, and less code.

Reviewed-by: Hendrik Brueckner <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>

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s390/fpu: remove "novx" option

Remove the "novx" kernel command line option: the vector code runs
without any problems since many years.

Reviewed-by: Hendrik Brueckner <[email protected]>
Sig

s390/fpu: remove "novx" option

Remove the "novx" kernel command line option: the vector code runs
without any problems since many years.

Reviewed-by: Hendrik Brueckner <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Alexander Gordeev <[email protected]>

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s390/bp: remove s390_isolate_bp_guest()

s390_isolate_bp_guest() is unused. Remove it.

Reviewed-by: Alexander Gordeev <[email protected]>
Reviewed-by: Sven Schnelle <[email protected]>
Signed

s390/bp: remove s390_isolate_bp_guest()

s390_isolate_bp_guest() is unused. Remove it.

Reviewed-by: Alexander Gordeev <[email protected]>
Reviewed-by: Sven Schnelle <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

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s390/bp: remove TIF_ISOLATE_BP

TIF_ISOLATE_BP is unused since it was introduced with commit 6b73044b2b00
("s390: run user space and KVM guests with modified branch prediction").
Given that there is

s390/bp: remove TIF_ISOLATE_BP

TIF_ISOLATE_BP is unused since it was introduced with commit 6b73044b2b00
("s390: run user space and KVM guests with modified branch prediction").
Given that there is no use case remove it again.

Acked-by: Alexander Gordeev <[email protected]>
Reviewed-by: Sven Schnelle <[email protected]>
Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

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s390/cpufeature: rework to allow more than only hwcap bits

Rework cpufeature implementation to allow for various cpu feature
indications, which is not only limited to hwcap bits. This is achieved
by

s390/cpufeature: rework to allow more than only hwcap bits

Rework cpufeature implementation to allow for various cpu feature
indications, which is not only limited to hwcap bits. This is achieved
by adding a sequential list of cpu feature numbers, where each of them
is mapped to an entry which indicates what this number is about.

Each entry contains a type member, which indicates what feature
name space to look into (e.g. hwcap, or cpu facility). If wanted this
allows also to automatically load modules only in e.g. z/VM
configurations.

Signed-off-by: Heiko Carstens <[email protected]>
Signed-off-by: Steffen Eiden <[email protected]>
Reviewed-by: Claudio Imbrenda <[email protected]>
Reviewed-by: Hendrik Brueckner <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexander Gordeev <[email protected]>

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s390: add z16 elf platform

Add detection for machine types 0x3931 and 0x3932 and set ELF platform
name to z16.

Signed-off-by: Heiko Carstens <[email protected]>

s390: raise minimum supported machine generation to z10

Machine generations up to z9 (released in May 2006) have been officially
out of service for several years now (z9 end of service - January 31,

s390: raise minimum supported machine generation to z10

Machine generations up to z9 (released in May 2006) have been officially
out of service for several years now (z9 end of service - January 31, 2019).
No distributions build kernels supporting those old machine generations
anymore, except Debian, which seems to pick the oldest supported
generation. The team supporting Debian on s390 has been notified about
the change.

Raising minimum supported machine generation to z10 helps to reduce
maintenance cost and effectively remove code, which is not getting
enough testing coverage due to lack of older hardware and distributions
support. Besides that this unblocks some optimization opportunities and
allows to use wider instruction set in asm files for future features
implementation. Due to this change spectre mitigation and usercopy
implementations could be drastically simplified and many newer instructions
could be converted from ".insn" encoding to instruction names.

Acked-by: Ilya Leoshkevich <[email protected]>
Reviewed-by: Heiko Carstens <[email protected]>
Signed-off-by: Vasily Gorbik <[email protected]>

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s390: replace deprecated CPU-hotplug functions

The functions get_online_cpus() and put_online_cpus() have been
deprecated during the CPU hotplug rework. They map directly to
cpus_read_lock() and cpu

s390: replace deprecated CPU-hotplug functions

The functions get_online_cpus() and put_online_cpus() have been
deprecated during the CPU hotplug rework. They map directly to
cpus_read_lock() and cpus_read_unlock().

Replace deprecated CPU-hotplug functions with the official version.
The behavior remains unchanged.

Signed-off-by: Sebastian Andrzej Siewior <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Carstens <[email protected]>

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s390/hwcaps: make sie capability regular hwcap

Commit 7f16d7e787b7 ("s390: show virtualization support in /proc/cpuinfo")
introduced special handling for sie capability, saying this should not be
ex

s390/hwcaps: make sie capability regular hwcap

Commit 7f16d7e787b7 ("s390: show virtualization support in /proc/cpuinfo")
introduced special handling for sie capability, saying this should not be
exposed via hwcaps, without giving a reason.

However this leads to an inconsistent /proc/cpuinfo features line
where all features except the sie capability are also present in
hwcaps. I really don't see a reason to not add that to hwcaps - it
might be quite pointless, but at least this way it is possible to get
rid of some special handling.

Signed-off-by: Heiko Carstens <[email protected]>

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s390/hwcaps: remove hwcap stfle check

Remove the not so obvious "(elf_hwcap & (1UL << 2)" which only checks
if stfle is available. This used to be required for old code before
test_facility() was in

s390/hwcaps: remove hwcap stfle check

Remove the not so obvious "(elf_hwcap & (1UL << 2)" which only checks
if stfle is available. This used to be required for old code before
test_facility() was introduced. test_facility() will do the right
thing, regardless if stfle is available or not.

Signed-off-by: Heiko Carstens <[email protected]>

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s390/hwcaps: remove z/Architecture mode active check

Remove a leftover from the common 31/64 bit code. z/Architecture mode
is now always active, there is no need to check.

Signed-off-by: Heiko Cars

s390/hwcaps: remove z/Architecture mode active check

Remove a leftover from the common 31/64 bit code. z/Architecture mode
is now always active, there is no need to check.

Signed-off-by: Heiko Carstens <[email protected]>

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s390/hwcaps: use consistent coding style / remove comments

Use a consistent coding style within setup_hwcaps() and remove obvious
and outdated comments.

Signed-off-by: Heiko Carstens <[email protected]

s390/hwcaps: use consistent coding style / remove comments

Use a consistent coding style within setup_hwcaps() and remove obvious
and outdated comments.

Signed-off-by: Heiko Carstens <[email protected]>

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s390/hwcaps: open code initialization of first six hwcap bits

The first six hwcap bits are initialized in a rather odd way: an array
contains the stfl(e) bits which need to be set, so that the
corre

s390/hwcaps: open code initialization of first six hwcap bits

The first six hwcap bits are initialized in a rather odd way: an array
contains the stfl(e) bits which need to be set, so that the
corresponding bit position (= array index) within hwcaps are set.

Better open code it like it is done for all other bits, making it
obvious which bit is set when.

Signed-off-by: Heiko Carstens <[email protected]>

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s390/hwcaps: split setup_hwcaps()

setup_hwcaps() is a quite large function. Make it smaller by moving
the elf platform setup code into an independent setup function.

Signed-off-by: Heiko Carstens <

s390/hwcaps: split setup_hwcaps()

setup_hwcaps() is a quite large function. Make it smaller by moving
the elf platform setup code into an independent setup function.

Signed-off-by: Heiko Carstens <[email protected]>

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s390/hwcaps: move setup_hwcaps()

Move setup_hwcaps() to processor.c for two reasons:
- make setup.c a bit smaller
- have allmost all of the hwcap code in one file

Signed-off-by: Heiko Carstens <hca

s390/hwcaps: move setup_hwcaps()

Move setup_hwcaps() to processor.c for two reasons:
- make setup.c a bit smaller
- have allmost all of the hwcap code in one file

Signed-off-by: Heiko Carstens <[email protected]>

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s390/hwcaps: add sanity checks

Add BUILD_BUG_ON() sanity checks to make sure the hwcap string array
contains a string for each hwcap.

Signed-off-by: Heiko Carstens <[email protected]>

s390/hwcaps: use named initializers for hwcap string arrays

Use named initializers to make it obvious which hwcap string array
element belongs to which hwcap.

Signed-off-by: Heiko Carstens <hca@lin

s390/hwcaps: use named initializers for hwcap string arrays

Use named initializers to make it obvious which hwcap string array
element belongs to which hwcap.

Signed-off-by: Heiko Carstens <[email protected]>

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