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Blackfin/ipipe: fix deferred pipeline sync for the root stage 

This patch makes sure to sync the pipeline for the root stage only
from the outer interrupt level, when resuming kernel code after an
interrupt.

This fixes a bug causing EVT15 to be spuriously popped off upon nested
interrupts, which in turn would cause the preempted kernel code to
resume without supervisor privileges.

Signed-off-by: Philippe Gerum <rpm@xenomai.org>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Philippe Gerum 2011-03-17 02:15:24 -04:00 committed by Mike Frysinger
parent 5b5da4c4b8
commit 9169b51f8c
2 changed files with 14 additions and 3 deletions
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11
arch/blackfin/mach-common/entry.S
View File

@ -952,8 +952,17 @@ ENDPROC(_evt_up_evt14)
#ifdef CONFIG_IPIPE
_resume_kernel_from_int:
r1 = LO(~0x8000) (Z);
r1 = r0 & r1;
r0 = 1;
r0 = r1 - r0;
r2 = r1 & r0;
cc = r2 == 0;
/* Sync the root stage only from the outer interrupt level. */
if !cc jump .Lnosync;
r0.l = ___ipipe_sync_root;
r0.h = ___ipipe_sync_root;
[--sp] = reti;
[--sp] = rets;
[--sp] = ( r7:4, p5:3 );
SP += -12;
@ -961,6 +970,8 @@ _resume_kernel_from_int:
SP += 12;
( r7:4, p5:3 ) = [sp++];
rets = [sp++];
reti = [sp++];
.Lnosync:
rts
#elif defined(CONFIG_PREEMPT)

6
arch/blackfin/mach-common/interrupt.S
View File

@ -274,16 +274,16 @@ ENDPROC(_evt_system_call)
* level to EVT14 to prepare the caller for a normal interrupt
* return through RTI.
*
* We currently use this facility in two occasions:
* We currently use this feature in two occasions:
*
* - to branch to __ipipe_irq_tail_hook as requested by a high
* - before branching to __ipipe_irq_tail_hook as requested by a high
* priority domain after the pipeline delivered an interrupt,
* e.g. such as Xenomai, in order to start its rescheduling
* procedure, since we may not switch tasks when IRQ levels are
* nested on the Blackfin, so we have to fake an interrupt return
* so that we may reschedule immediately.
*
* - to branch to sync_root_irqs, in order to play any interrupt
* - before branching to __ipipe_sync_root(), in order to play any interrupt
* pending for the root domain (i.e. the Linux kernel). This lowers
* the core priority level enough so that Linux IRQ handlers may
* never delay interrupts handled by high priority domains; we defer