Christophe Leroy
0b736881c8
powerpc/traps: unrecoverable_exception() is not an interrupt handler
...
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: 3a96570ffcchristophe.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
2021-03-12 11:02:12 +11:00
Christophe Leroy
91b6c5dbe9
powerpc/syscall: Force inlining of __prep_irq_for_enabled_exit()
...
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: 344bb20b15lkp@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
2021-03-01 12:33:31 +11:00
Christophe Leroy
5b90b9661a
powerpc/syscall: Avoid storing 'current' in another pointer
...
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
2021-02-11 23:35:13 +11:00
Christophe Leroy
d524dda719
powerpc/32: Handle bookE debugging in C in syscall entry/exit
...
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
2021-02-11 23:35:12 +11:00
Christophe Leroy
b966f22790
powerpc/syscall: Do not check unsupported scv vector on PPC32
...
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
2021-02-11 23:35:12 +11:00
Christophe Leroy
c01b916658
powerpc/syscall: Change condition to check MSR_RI
...
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
2021-02-11 23:35:11 +11:00
Christophe Leroy
8875f47b76
powerpc/syscall: Save r3 in regs->orig_r3
...
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
2021-02-11 23:35:10 +11:00
Christophe Leroy
72b7a9e56b
powerpc/syscall: Use is_compat_task()
...
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
2021-02-11 23:35:10 +11:00
Christophe Leroy
344bb20b15
powerpc/syscall: Make interrupt.c buildable on PPC32
...
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
2021-02-11 23:35:10 +11:00
Christophe Leroy
ab1a517d55
powerpc/syscall: Rename syscall_64.c into interrupt.c
...
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
2021-02-11 23:35:10 +11:00
