linux.git/arch/powerpc/include/asm/interrupt.h, branch v5.12

powerpc/traps: unrecoverable_exception() is not an interrupt handler

2021-03-12T00:02:12+00:00

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 
Reviewed-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/ae96c59fa2cb7f24a8929c58cfa2c909cb8ff1f1.1615291471.git.christophe.leroy@csgroup.eu

powerpc/32: Handle bookE debugging in C in syscall entry/exit

2021-02-11T12:35:12+00:00

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 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/1a7515f9258b27a9177de88491a8bb79b255ceb7.1612898425.git.christophe.leroy@csgroup.eu

powerpc: remove interrupt handler functions from the noinstr section

2021-02-11T12:28:34+00:00

The allyesconfig ppc64 kernel fails to link with relocations unable to
fit after commit 3a96570ffceb ("powerpc: convert interrupt handlers to
use wrappers"), which is due to the interrupt handler functions being
put into the .noinstr.text section, which the linker script places on
the opposite side of the main .text section from the interrupt entry
asm code which calls the handlers.

This results in a lot of linker stubs that overwhelm the 252-byte sized
space we allow for them, or in the case of BE a .opd relocation link
error for some reason.

It's not required to put interrupt handlers in the .noinstr section,
previously they used NOKPROBE_SYMBOL, so take them out and replace
with a NOKPROBE_SYMBOL in the wrapper macro. Remove the explicit
NOKPROBE_SYMBOL macros in the interrupt handler functions. This makes
a number of interrupt handlers nokprobe that were not prior to the
interrupt wrappers commit, but since that commit they were made
nokprobe due to being in .noinstr.text, so this fix does not change
that.

The fixes tag is different to the commit that first exposes the problem
because it is where the wrapper macros were introduced.

Fixes: 8d41fc618ab8 ("powerpc: interrupt handler wrapper functions")
Reported-by: Stephen Rothwell 
Signed-off-by: Nicholas Piggin 
[mpe: Slightly fix up comment wording]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20210211063636.236420-1-npiggin@gmail.com

powerpc/64s: runlatch interrupt handling in C

2021-02-08T13:10:50+00:00

There is no need for this to be in asm, use the new intrrupt entry wrapper.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20210130130852.2952424-42-npiggin@gmail.com

powerpc/64s: move NMI soft-mask handling to C

2021-02-08T13:10:50+00:00

Saving and restoring soft-mask state can now be done in C using the
interrupt handler wrapper functions.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20210130130852.2952424-41-npiggin@gmail.com

powerpc: move NMI entry/exit code into wrapper

2021-02-08T13:10:50+00:00

This moves the common NMI entry and exit code into the interrupt handler
wrappers.

This changes the behaviour of soft-NMI (watchdog) and HMI interrupts, and
also MCE interrupts on 64e, by adding missing parts of the NMI entry to
them.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20210130130852.2952424-40-npiggin@gmail.com

powerpc/64: entry cpu time accounting in C

2021-02-08T13:10:49+00:00

There is no need for this to be in asm, use the new interrupt entry wrapper.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20210130130852.2952424-39-npiggin@gmail.com

powerpc/64s: reconcile interrupts in C

2021-02-08T13:10:49+00:00

There is no need for this to be in asm, use the new intrrupt entry wrapper.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20210130130852.2952424-37-npiggin@gmail.com

powerpc/64s: move context tracking exit to interrupt exit path

2021-02-08T13:10:49+00:00

The interrupt handler wrapper functions are not the ideal place to
maintain context tracking because after they return, the low level exit
code must then determine if there are interrupts to replay, or if the
task should be preempted, etc. Those paths (e.g., schedule_user) include
their own exception_enter/exit pairs to fix this up but it's a bit hacky
(see schedule_user() comments).

Ideally context tracking will go to user mode only when there are no
more interrupts or context switches or other exit processing work to
handle.

64e can not do this because it does not use the C interrupt exit code.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20210130130852.2952424-36-npiggin@gmail.com

powerpc: handle irq_enter/irq_exit in interrupt handler wrappers

2021-02-08T13:10:49+00:00

Move irq_enter/irq_exit into asynchronous interrupt handler wrappers.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20210130130852.2952424-35-npiggin@gmail.com