m68k: Simplify low level interrupt handling code
The low level interrupt entry code of m68k contains the following:
add_preempt_count(HARDIRQ_OFFSET);
do_IRQ();
irq_enter();
add_preempt_count(HARDIRQ_OFFSET);
handle_interrupt();
irq_exit();
sub_preempt_count(HARDIRQ_OFFSET);
if (in_interrupt())
return; <---- On m68k always taken!
if (local_softirq_pending())
do_softirq();
sub_preempt_count(HARDIRQ_OFFSET);
if (in_hardirq())
return;
if (status_on_stack_has_interrupt_priority_mask > 0)
return;
if (local_softirq_pending())
do_softirq();
ret_from_exception:
if (interrupted_context_is_kernel)
return:
....
I tried to find a proper explanation for this, but the changelog is
sparse and there are no mails explaining it further. But obviously
this relates to the interrupt priority levels of the m68k and tries to
be extra clever with nested interrupts. Though this cleverness just
adds code bloat to the interrupt hotpath.
For the common case of non nested interrupts the code runs through two
extra conditionals to the only important one, which checks whether the
return is to kernel or user space.
For the nested case the checks for in_hardirq() and the priority mask
value on stack catch only the case where the nested interrupt happens
inside the hard irq context of the first interrupt. If the nested
interrupt happens while the first interrupt handles soft interrupts,
then these extra checks buy nothing. The nested interrupt will fall
through to the final kernel/user space return check at
ret_from_exception.
Changing the code flow in the following way:
do_IRQ();
irq_enter();
add_preempt_count(HARDIRQ_OFFSET);
handle_interrupt();
irq_exit();
sub_preempt_count(HARDIRQ_OFFSET);
if (in_interrupt())
return;
if (local_softirq_pending())
do_softirq();
ret_from_exception:
if (interrupted_context_is_kernel)
return:
makes the region protected by the hardirq count slightly smaller and
the softirq handling is invoked with a minimal deeper stack. But
otherwise it's completely functional equivalent and saves 104 bytes of
text in arch/m68k/kernel/entry.o.
This modification allows us further to get rid of the limitations
which m68k puts on the preempt_count layout, so we can make the
preempt count bits completely generic.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Michael Schmitz <schmitz@biophys.uni-duesseldorf.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Linux/m68k <linux-m68k@vger.kernel.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.02.1311112052360.30673@ionos.tec.linutronix.de
This commit is contained in:
Thomas Gleixner
parent
b39898cd40
commit
09f90f6685
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@ -45,7 +45,7 @@
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.globl system_call, buserr, trap, resume
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.globl sys_call_table
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.globl __sys_fork, __sys_clone, __sys_vfork
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.globl ret_from_interrupt, bad_interrupt
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.globl bad_interrupt
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.globl auto_irqhandler_fixup
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.globl user_irqvec_fixup
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@ -275,8 +275,6 @@ do_delayed_trace:
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ENTRY(auto_inthandler)
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SAVE_ALL_INT
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GET_CURRENT(%d0)
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movel %d0,%a1
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addqb #1,%a1@(TINFO_PREEMPT+1)
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| put exception # in d0
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bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
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subw #VEC_SPUR,%d0
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@ -286,32 +284,13 @@ ENTRY(auto_inthandler)
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auto_irqhandler_fixup = . + 2
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jsr do_IRQ | process the IRQ
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addql #8,%sp | pop parameters off stack
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ret_from_interrupt:
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movel %curptr@(TASK_STACK),%a1
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subqb #1,%a1@(TINFO_PREEMPT+1)
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jeq ret_from_last_interrupt
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2: RESTORE_ALL
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ALIGN
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ret_from_last_interrupt:
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moveq #(~ALLOWINT>>8)&0xff,%d0
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andb %sp@(PT_OFF_SR),%d0
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jne 2b
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/* check if we need to do software interrupts */
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tstl irq_stat+CPUSTAT_SOFTIRQ_PENDING
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jeq .Lret_from_exception
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pea ret_from_exception
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jra do_softirq
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jra ret_from_exception
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/* Handler for user defined interrupt vectors */
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ENTRY(user_inthandler)
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SAVE_ALL_INT
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GET_CURRENT(%d0)
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movel %d0,%a1
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addqb #1,%a1@(TINFO_PREEMPT+1)
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| put exception # in d0
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bfextu %sp@(PT_OFF_FORMATVEC){#4,#10},%d0
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user_irqvec_fixup = . + 2
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@ -321,29 +300,18 @@ user_irqvec_fixup = . + 2
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movel %d0,%sp@- | put vector # on stack
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jsr do_IRQ | process the IRQ
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addql #8,%sp | pop parameters off stack
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movel %curptr@(TASK_STACK),%a1
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subqb #1,%a1@(TINFO_PREEMPT+1)
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jeq ret_from_last_interrupt
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RESTORE_ALL
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jra ret_from_exception
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/* Handler for uninitialized and spurious interrupts */
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ENTRY(bad_inthandler)
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SAVE_ALL_INT
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GET_CURRENT(%d0)
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movel %d0,%a1
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addqb #1,%a1@(TINFO_PREEMPT+1)
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movel %sp,%sp@-
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jsr handle_badint
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addql #4,%sp
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movel %curptr@(TASK_STACK),%a1
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subqb #1,%a1@(TINFO_PREEMPT+1)
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jeq ret_from_last_interrupt
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RESTORE_ALL
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jra ret_from_exception
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resume:
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/*
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@ -58,12 +58,6 @@ void __init init_IRQ(void)
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{
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int i;
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/* assembly irq entry code relies on this... */
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if (HARDIRQ_MASK != 0x00ff0000) {
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extern void hardirq_mask_is_broken(void);
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hardirq_mask_is_broken();
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}
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for (i = IRQ_AUTO_1; i <= IRQ_AUTO_7; i++)
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irq_set_chip_and_handler(i, &auto_irq_chip, handle_simple_irq);
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@ -27,7 +27,6 @@
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.globl ret_from_exception
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.globl ret_from_signal
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.globl sys_call_table
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.globl ret_from_interrupt
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.globl bad_interrupt
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.globl inthandler1
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.globl inthandler2
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@ -137,7 +136,7 @@ inthandler1:
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movel #65,%sp@- /* put vector # on stack*/
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jbsr process_int /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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bra ret_from_exception
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inthandler2:
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SAVE_ALL_INT
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@ -148,7 +147,7 @@ inthandler2:
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movel #66,%sp@- /* put vector # on stack*/
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jbsr process_int /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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bra ret_from_exception
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inthandler3:
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SAVE_ALL_INT
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@ -159,7 +158,7 @@ inthandler3:
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movel #67,%sp@- /* put vector # on stack*/
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jbsr process_int /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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bra ret_from_exception
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inthandler4:
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SAVE_ALL_INT
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@ -170,7 +169,7 @@ inthandler4:
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movel #68,%sp@- /* put vector # on stack*/
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jbsr process_int /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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bra ret_from_exception
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inthandler5:
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SAVE_ALL_INT
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@ -181,7 +180,7 @@ inthandler5:
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movel #69,%sp@- /* put vector # on stack*/
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jbsr process_int /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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bra ret_from_exception
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inthandler6:
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SAVE_ALL_INT
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@ -192,7 +191,7 @@ inthandler6:
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movel #70,%sp@- /* put vector # on stack*/
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jbsr process_int /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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bra ret_from_exception
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inthandler7:
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SAVE_ALL_INT
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@ -203,7 +202,7 @@ inthandler7:
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movel #71,%sp@- /* put vector # on stack*/
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jbsr process_int /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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bra ret_from_exception
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inthandler:
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SAVE_ALL_INT
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@ -214,23 +213,7 @@ inthandler:
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movel %d0,%sp@- /* put vector # on stack*/
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jbsr process_int /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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ret_from_interrupt:
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jeq 1f
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2:
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RESTORE_ALL
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1:
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moveb %sp@(PT_OFF_SR), %d0
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and #7, %d0
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jhi 2b
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/* check if we need to do software interrupts */
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jeq ret_from_exception
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pea ret_from_exception
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jra do_softirq
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bra ret_from_exception
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/*
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* Handler for uninitialized and spurious interrupts.
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@ -29,7 +29,6 @@
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.globl ret_from_exception
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.globl ret_from_signal
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.globl sys_call_table
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.globl ret_from_interrupt
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.globl bad_interrupt
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.globl inthandler
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@ -132,26 +131,9 @@ inthandler:
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movel %sp,%sp@-
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movel %d0,%sp@- /* put vector # on stack*/
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jbsr do_IRQ /* process the IRQ*/
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3: addql #8,%sp /* pop parameters off stack*/
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bra ret_from_interrupt
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ret_from_interrupt:
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jeq 1f
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2:
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RESTORE_ALL
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1:
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moveb %sp@(PT_OFF_SR), %d0
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and #7, %d0
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jhi 2b
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/* check if we need to do software interrupts */
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movel irq_stat+CPUSTAT_SOFTIRQ_PENDING,%d0
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jeq ret_from_exception
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pea ret_from_exception
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jra do_softirq
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jbsr do_IRQ /* process the IRQ */
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addql #8,%sp /* pop parameters off stack*/
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jra ret_from_exception
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/*
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* Handler for uninitialized and spurious interrupts.
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