diff options
| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-06-27 09:01:09 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-08-22 12:20:04 +0200 |
| commit | 1f44a225777e40fd9a945b09f958052c47494e1e (patch) | |
| tree | c33f67424d4cb06f481883b25e75390eccd15ca7 /drivers/s390/cio/airq.c | |
| parent | 5d0d8f43535bc4e19406ecf158340ccc4027a477 (diff) | |
| download | linux-1f44a225777e40fd9a945b09f958052c47494e1e.tar.bz2 | |
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 'drivers/s390/cio/airq.c')
| -rw-r--r-- | drivers/s390/cio/airq.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/drivers/s390/cio/airq.c b/drivers/s390/cio/airq.c index 6ead6d076445..d028fd800c9c 100644 --- a/drivers/s390/cio/airq.c +++ b/drivers/s390/cio/airq.c @@ -81,17 +81,34 @@ void unregister_adapter_interrupt(struct airq_struct *airq) } EXPORT_SYMBOL(unregister_adapter_interrupt); -void do_adapter_IO(u8 isc) +static irqreturn_t do_airq_interrupt(int irq, void *dummy) { + struct tpi_info *tpi_info; struct airq_struct *airq; struct hlist_head *head; - head = &airq_lists[isc]; + __this_cpu_write(s390_idle.nohz_delay, 1); + tpi_info = (struct tpi_info *) &get_irq_regs()->int_code; + head = &airq_lists[tpi_info->isc]; rcu_read_lock(); hlist_for_each_entry_rcu(airq, head, list) if ((*airq->lsi_ptr & airq->lsi_mask) != 0) airq->handler(airq); rcu_read_unlock(); + + return IRQ_HANDLED; +} + +static struct irqaction airq_interrupt = { + .name = "AIO", + .handler = do_airq_interrupt, +}; + +void __init init_airq_interrupts(void) +{ + irq_set_chip_and_handler(THIN_INTERRUPT, + &dummy_irq_chip, handle_percpu_irq); + setup_irq(THIN_INTERRUPT, &airq_interrupt); } /** |