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powerpc/64/syscall: Reconcile interrupts

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This reconciles interrupts in the system call case like all other
interrupts. This allows system_call_common to be shared with the scv
system call implementation in a subsequent patch.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200225173541.1549955-31-npiggin@gmail.com
This commit is contained in:
Nicholas Piggin 2020-02-26 03:35:39 +10:00 committed by Michael Ellerman
parent 702f098052
commit 5f0b6ac390
2 changed files with 21 additions and 14 deletions
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11
arch/powerpc/kernel/entry_64.S
View File

@ -119,6 +119,17 @@ END_BTB_FLUSH_SECTION
ld r11,exception_marker@toc(r2)
std r11,-16(r10) /* "regshere" marker */
/*
* RECONCILE_IRQ_STATE without calling trace_hardirqs_off(), which
* would clobber syscall parameters. Also we always enter with IRQs
* enabled and nothing pending. system_call_exception() will call
* trace_hardirqs_off().
*/
li r11,IRQS_ALL_DISABLED
li r12,PACA_IRQ_HARD_DIS
stb r11,PACAIRQSOFTMASK(r13)
stb r12,PACAIRQHAPPENED(r13)
/* Calling convention has r9 = orig r0, r10 = regs */
mr r9,r0
bl system_call_exception

24
arch/powerpc/kernel/syscall_64.c
View File

@ -17,13 +17,19 @@
typedef long (*syscall_fn)(long, long, long, long, long, long);
/* Has to run notrace because it is entered "unreconciled" */
notrace long system_call_exception(long r3, long r4, long r5, long r6, long r7, long r8,
unsigned long r0, struct pt_regs *regs)
/* Has to run notrace because it is entered not completely "reconciled" */
notrace long system_call_exception(long r3, long r4, long r5,
long r6, long r7, long r8,
unsigned long r0, struct pt_regs *regs)
{
unsigned long ti_flags;
syscall_fn f;
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
BUG_ON(irq_soft_mask_return() != IRQS_ALL_DISABLED);
trace_hardirqs_off(); /* finish reconciling */
if (IS_ENABLED(CONFIG_PPC_BOOK3S))
BUG_ON(!(regs->msr & MSR_RI));
BUG_ON(!(regs->msr & MSR_PR));
@ -44,16 +50,6 @@ notrace long system_call_exception(long r3, long r4, long r5, long r6, long r7,
kuap_check_amr();
/*
* A syscall should always be called with interrupts enabled
* so we just unconditionally hard-enable here. When some kind
* of irq tracing is used, we additionally check that condition
* is correct
*/
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG)) {
WARN_ON(irq_soft_mask_return() != IRQS_ENABLED);
WARN_ON(local_paca->irq_happened);
}
/*
* This is not required for the syscall exit path, but makes the
* stack frame look nicer. If this was initialised in the first stack
@ -62,7 +58,7 @@ notrace long system_call_exception(long r3, long r4, long r5, long r6, long r7,
*/
regs->softe = IRQS_ENABLED;
__hard_irq_enable();
local_irq_enable();
ti_flags = current_thread_info()->flags;
if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) {