linux.git/arch/s390/include/asm/setup.h, branch v6.16

s390: Convert MACHINE_IS_[LPAR|VM|KVM], etc, machine_is_[lpar|vm|kvm]()

2025-03-04T16:18:07+00:00

Move machine type detection to the decompressor and use static branches
to implement and use machine_is_[lpar|vm|kvm]() instead of a runtime check
via MACHINE_IS_[LPAR|VM|KVM].

Reviewed-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/diag: Convert MACHINE_HAS_DIAG9C to machine_has_diag9c()

2025-03-04T16:18:06+00:00

Use static branch(es) to implement and use machine_has_diag9c() instead of
a runtime check via MACHINE_HAS_DIAG9C.

Reviewed-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/kvm: Convert MACHINE_HAS_ESOP to machine_has_esop()

2025-03-04T16:18:06+00:00

Use static branch(es) to implement and use machine_has_esop() instead
of a runtime check via MACHINE_HAS_ESOP.

Reviewed-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/tx: Convert MACHINE_HAS_TE to machine_has_tx()

2025-03-04T16:18:06+00:00

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

Reviewed-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/tlb: Convert MACHINE_HAS_TLB_GUEST to machine_has_tlb_guest()

2025-03-04T16:18:06+00:00

Use static branch(es) to implement and use machine_has_tlb_guest()
instead of a runtime check via MACHINE_HAS_TLB_GUEST.

Also add sclp_early_detect_machine_features() in order to allow for
feature detection from the decompressor.

Reviewed-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/time: Convert MACHINE_HAS_SCC to machine_has_scc()

2025-03-04T16:18:06+00:00

Use static branch(es) to implement and use machine_has_scc() instead
of a runtime check via MACHINE_HAS_SCC.

This comes with a cleanup of early time initialization: the initial
tod_clock_base value is now passed via the bootdata mechanism, instead
of using absolute lowcore as transport vehicle from the decompressor
to the kernel.

Also the early tod clock initialization is moved to the decompressor
which allows to use a static branch with machine_has_scc() within the
kernel.

Reviewed-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/pci: Get rid of MACHINE_HAS_PCI_MIO

2025-03-04T16:18:06+00:00

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 
Tested-by: Niklas Schnelle 
Reviewed-by: Vasily Gorbik 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/cpufeature: Convert MACHINE_HAS_IDTE to cpu_has_idte()

2025-03-04T16:18:05+00:00

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 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/cpufeature: Convert MACHINE_HAS_EDAT2 to cpu_has_edat2()

2025-03-04T16:18:05+00:00

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 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik

s390/cpufeature: Convert MACHINE_HAS_EDAT1 to cpu_has_edat1()

2025-03-04T16:18:05+00:00

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 
Signed-off-by: Heiko Carstens 
Signed-off-by: Vasily Gorbik