kernel.git/arch/powerpc/kernel/exceptions-64e.S, branch linux-5.13.y

powerpc/64e/interrupt: Fix nvgprs being clobbered

2021-05-14T07:28:54Z

Some interrupt handlers have an "extra" that saves 1 or 2 registers (r14, r15) in the paca save area and makes them available to use by the handler. The change to always save nvgprs in exception handlers lead to some interrupt handlers saving those scratch r14 / r15 registers into the interrupt frame's GPR saves, which get restored on interrupt exit. Fix this by always reloading those scratch registers from paca before the EXCEPTION_COMMON that saves nvgprs. Fixes: 4228b2c3d20e ("powerpc/64e/interrupt: always save nvgprs on interrupt") Reported-by: Christian Zigotzky Signed-off-by: Nicholas Piggin Tested-by: Christian Zigotzky Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210514044008.1955783-1-npiggin@gmail.com

powerpc/64e/interrupt: handle bad_page_fault in C

2021-04-14T13:04:43Z

With non-volatile registers saved on interrupt, bad_page_fault can now be called by do_page_fault. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210316104206.407354-9-npiggin@gmail.com

powerpc/64e/interrupt: reconcile irq soft-mask state in C

2021-04-14T13:04:43Z

Use existing 64s interrupt entry wrapper code to reconcile irqs in C. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210316104206.407354-7-npiggin@gmail.com

powerpc/64e/interrupt: NMI save irq soft-mask state in C

2021-04-14T13:04:20Z

64e non-maskable interrupts save the state of the irq soft-mask in asm. This can be done in C in interrupt wrappers as 64s does. I haven't been able to test this with qemu because it doesn't seem to cause FSL bookE WDT interrupts. This makes WatchdogException an NMI interrupt, which affects 32-bit as well (okay, or create a new handler?) Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210316104206.407354-6-npiggin@gmail.com

powerpc/64e/interrupt: use new interrupt return

2021-04-14T13:04:20Z

Update the new C and asm interrupt return code to account for 64e specifics, switch over to use it. The now-unused old ret_from_except code, that was moved to 64e after the 64s conversion, is removed. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210316104206.407354-5-npiggin@gmail.com

powerpc/64e/interrupt: always save nvgprs on interrupt

2021-04-14T13:04:19Z

In order to use the C interrupt return, nvgprs must always be saved. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210316104206.407354-3-npiggin@gmail.com

powerpc/64: entry cpu time accounting in C

2021-02-08T13:10:49Z

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: bad_page_fault get registers from regs

2021-02-08T13:02:09Z

Similar to the previous patch this makes interrupt handler function types more regular so they can be wrapped with the next patch. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210130130852.2952424-12-npiggin@gmail.com

powerpc: DebugException remove args

2021-02-08T13:02:09Z

Like other interrupt handler conversions, switch to getting registers from the pt_regs argument. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210130130852.2952424-10-npiggin@gmail.com

powerpc: remove arguments from fault handler functions

2021-02-08T13:02:08Z

Make mm fault handlers all just take the pt_regs * argument and load DAR/DSISR from that. Make those that return a value return long. This is done to make the function signatures match other handlers, which will help with a future patch to add wrappers. Explicit arguments could be added for performance but that would require more wrapper macro variants. Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210130130852.2952424-7-npiggin@gmail.com