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* powerpc/syscall: switch user_exit_irqoff and trace_hardirqs_off orderNicholas Piggin2021-04-141-2/+2
| | | | | | | | | | | | | | user_exit_irqoff() -> __context_tracking_exit -> vtime_user_exit warns in __seqprop_assert due to lockdep thinking preemption is enabled because trace_hardirqs_off() has not yet been called. Switch the order of these two calls, which matches their ordering in interrupt_enter_prepare. Fixes: 5f0b6ac3905f ("powerpc/64/syscall: Reconcile interrupts") Signed-off-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20210316104206.407354-2-npiggin@gmail.com
* powerpc/32: Manage KUAP in CChristophe Leroy2021-03-291-15/+4
| | | | | | | | Move all KUAP management in C. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/199365ddb58d579daf724815f2d0acb91cc49d19.1615552867.git.christophe.leroy@csgroup.eu
* powerpc/64s: Make kuap_check_amr() and kuap_get_and_check_amr() genericChristophe Leroy2021-03-291-6/+6
| | | | | | | | | | | | In preparation of porting powerpc32 to C syscall entry/exit, rename kuap_check_amr() and kuap_get_and_check_amr() as kuap_assert_locked() and kuap_get_and_assert_locked(), and move in the generic asm/kup.h the stub for when CONFIG_PPC_KUAP is not selected. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/f82614d9b17b83abd739aa18fc08811815d0c2e3.1615552867.git.christophe.leroy@csgroup.eu
* powerpc/32s: Move KUEP locking/unlocking in CChristophe Leroy2021-03-291-0/+4
| | | | | | | | | | | | | This can be done in C, do it. Unrolling the loop gains approx. 15% performance. From now on, prepare_transfer_to_handler() is only for interrupts from kernel. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/4eadd873927e9a73c3d1dfe2f9497353465514cf.1615552867.git.christophe.leroy@csgroup.eu
* powerpc/32: Replace ASM exception exit by C exception exit from ppc64Christophe Leroy2021-03-291-1/+5
| | | | | | | | This patch replaces the PPC32 ASM exception exit by C exception exit. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/48f8bae91da899d8e73fc0d75c9af66cc97b4d5b.1615552867.git.christophe.leroy@csgroup.eu
* powerpc/traps: unrecoverable_exception() is not an interrupt handlerChristophe Leroy2021-03-121-1/+0
| | | | | | | | | | | | | | unrecoverable_exception() is called from interrupt handlers or after an interrupt handler has failed. Make it a standard function to avoid doubling the actions performed on interrupt entry (e.g.: user time accounting). Fixes: 3a96570ffceb ("powerpc: convert interrupt handlers to use wrappers") Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ae96c59fa2cb7f24a8929c58cfa2c909cb8ff1f1.1615291471.git.christophe.leroy@csgroup.eu
* powerpc/syscall: Force inlining of __prep_irq_for_enabled_exit()Christophe Leroy2021-03-011-1/+1
| | | | | | | | | | | | | | | | | | | As reported by kernel test robot, a randconfig with high amount of debuging options can lead to build failure for undefined reference to replay_soft_interrupts() on ppc32. This is due to gcc not seeing that __prep_irq_for_enabled_exit() always returns true on ppc32 because it doesn't inline it for some reason. Force inlining of __prep_irq_for_enabled_exit() to fix the build. Fixes: 344bb20b159d ("powerpc/syscall: Make interrupt.c buildable on PPC32") Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Acked-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/53f3a1f719441761000c41154602bf097d4350b5.1614148356.git.christophe.leroy@csgroup.eu
* powerpc/syscall: Avoid storing 'current' in another pointerChristophe Leroy2021-02-111-12/+9
| | | | | | | | | | | | | | | | By saving the pointer pointing to thread_info.flags, gcc copies r2 in a non-volatile register. We know 'current' doesn't change, so avoid that intermediaite pointer. Reduces null_syscall benchmark by 2 cycles (322 => 320 cycles) On PPC64, gcc seems to know that 'current' is not changing, and it keeps it in a non volatile register to avoid multiple read of 'current' in paca. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ad0363ff0ff8c125f40e1cdc589a85bbd7e31693.1612946484.git.christophe.leroy@csgroup.eu
* powerpc/32: Handle bookE debugging in C in syscall entry/exitChristophe Leroy2021-02-111-14/+27
| | | | | | | | | | | The handling of SPRN_DBCR0 and other registers can easily be done in C instead of ASM. For that, create booke_load_dbcr0() and booke_restore_dbcr0(). Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1a7515f9258b27a9177de88491a8bb79b255ceb7.1612898425.git.christophe.leroy@csgroup.eu
* powerpc/syscall: Do not check unsupported scv vector on PPC32Christophe Leroy2021-02-111-4/+5
| | | | | | | | | | | | | Only book3s/64 has scv. No need to check the 0x7ff0 trap on 32 or 64e. For that, add a helper trap_is_unsupported_scv() similar to trap_is_scv(). And ignore the scv parameter in syscall_exit_prepare (Save 14 cycles 346 => 332 cycles) Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/fb87b205ae8eb8c623f33bb316801acf95a831e6.1612898425.git.christophe.leroy@csgroup.eu
* powerpc/syscall: Change condition to check MSR_RIChristophe Leroy2021-02-111-3/+4
| | | | | | | | | | In system_call_exception(), MSR_RI also needs to be checked on 8xx. Only booke and 40x doesn't have MSR_RI. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/67820fada8dd6a8fe9d7b666f175d4cc9d8de87e.1612796617.git.christophe.leroy@csgroup.eu
* powerpc/syscall: Save r3 in regs->orig_r3Christophe Leroy2021-02-111-0/+2
| | | | | | | | | Save r3 in regs->orig_r3 in system_call_exception() Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/9a90805ab6b9101b46daf56470f457a57acd86fc.1612796617.git.christophe.leroy@csgroup.eu
* powerpc/syscall: Use is_compat_task()Christophe Leroy2021-02-111-1/+3
| | | | | | | | | | | Instead of hard comparing task flags with _TIF_32BIT, use is_compat_task(). The advantage is that it returns 0 on PPC32 allthough _TIF_32BIT is always set. Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/c8094662199337a7200fea9f6e1d1f8b1b6d5f69.1612796617.git.christophe.leroy@csgroup.eu
* powerpc/syscall: Make interrupt.c buildable on PPC32Christophe Leroy2021-02-111-7/+24
| | | | | | | | | | | | To allow building interrupt.c on PPC32, ifdef out specific PPC64 code or use helpers which are available on both PP32 and PPC64 Modify Makefile to always build interrupt.o Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/ba073ad67bd971a88ce331b65d6655523b54c794.1612796617.git.christophe.leroy@csgroup.eu
* powerpc/syscall: Rename syscall_64.c into interrupt.cChristophe Leroy2021-02-111-0/+479
syscall_64.c will be reused almost as is for PPC32. As this file also contains functions to handle other types of interrupts rename it interrupt.c Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Reviewed-by: Nicholas Piggin <npiggin@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/cddc2deaa8f049d3ec419738e69804934919b935.1612796617.git.christophe.leroy@csgroup.eu
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