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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2013-06-27 09:01:09 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-08-22 12:20:04 +0200
commit1f44a225777e40fd9a945b09f958052c47494e1e (patch)
treec33f67424d4cb06f481883b25e75390eccd15ca7 /arch/s390/kernel/entry.S
parent5d0d8f43535bc4e19406ecf158340ccc4027a477 (diff)
s390: convert interrupt handling to use generic hardirq
With the introduction of PCI it became apparent that s390 should convert to generic hardirqs as too many drivers do not have the correct dependency for GENERIC_HARDIRQS. On the architecture level s390 does not have irq lines. It has external interrupts, I/O interrupts and adapter interrupts. This patch hard-codes all external interrupts as irq #1, all I/O interrupts as irq #2 and all adapter interrupts as irq #3. The additional information from the lowcore associated with the interrupt is stored in the pt_regs of the interrupt frame, where the interrupt handler can pick it up. For PCI/MSI interrupts the adapter interrupt handler scans the relevant bit fields and calls generic_handle_irq with the virtual irq number for the MSI interrupt. Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/entry.S')
-rw-r--r--arch/s390/kernel/entry.S12
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index be7a408be7a1..5ca70b4b72cb 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -18,6 +18,7 @@
#include <asm/unistd.h>
#include <asm/page.h>
#include <asm/sigp.h>
+#include <asm/irq.h>
__PT_R0 = __PT_GPRS
__PT_R1 = __PT_GPRS + 4
@@ -435,6 +436,11 @@ io_skip:
io_loop:
l %r1,BASED(.Ldo_IRQ)
lr %r2,%r11 # pass pointer to pt_regs
+ lhi %r3,IO_INTERRUPT
+ tm __PT_INT_CODE+8(%r11),0x80 # adapter interrupt ?
+ jz io_call
+ lhi %r3,THIN_INTERRUPT
+io_call:
basr %r14,%r1 # call do_IRQ
tm __LC_MACHINE_FLAGS+2,0x10 # MACHINE_FLAG_LPAR
jz io_return
@@ -584,9 +590,10 @@ ext_skip:
mvc __PT_INT_CODE(4,%r11),__LC_EXT_CPU_ADDR
mvc __PT_INT_PARM(4,%r11),__LC_EXT_PARAMS
TRACE_IRQS_OFF
+ l %r1,BASED(.Ldo_IRQ)
lr %r2,%r11 # pass pointer to pt_regs
- l %r1,BASED(.Ldo_extint)
- basr %r14,%r1 # call do_extint
+ lhi %r3,EXT_INTERRUPT
+ basr %r14,%r1 # call do_IRQ
j io_return
/*
@@ -902,7 +909,6 @@ cleanup_idle_wait:
.Ldo_machine_check: .long s390_do_machine_check
.Lhandle_mcck: .long s390_handle_mcck
.Ldo_IRQ: .long do_IRQ
-.Ldo_extint: .long do_extint
.Ldo_signal: .long do_signal
.Ldo_notify_resume: .long do_notify_resume
.Ldo_per_trap: .long do_per_trap