linux-toradex.git/arch/parisc/kernel/irq.c, branch v2.6.22.13

[PARISC] remove global_ack_eiem

2007-06-12T05:23:30+00:00

Kudos to Thibaut Varene for spotting the (mis)use of appropriately named
global_ack_eiem. This took a long time to figure out and both insight
from myself, Kyle McMartin, and James Bottomley were required to narrow
down which bit of code could have this race condition.

The symptom was interrupts stopped getting delivered while some workload
was generating IO interrupts on two different CPUs. One of the interrupt
sources would get masked off and stay unmasked. Problem was global_ack_eiem
was accessed with read/modified/write sequence and not protected by
a spinlock.

PA-RISC doesn't need a global ack flag though. External Interrupts
are _always_ delivered to a single CPU (except for "global broadcast
interrupt" which AFAIK currently is not used.) So we don't have to worry
about any given IRQ vector getting delivered to more than one CPU.

Tested on a500 and rp34xx boxen. rsync to/from gsyprf11 (a500)
would lock up the box since NIC (tg3) interrupt and SCSI (sym2)
were on "opposite" CPUs (2 CPU system). Put them on the same CPU
or apply this patch and 10GB of data would rsync completely.

Please apply the following critical patch.

thanks,
grant

Signed-off-by: Grant Grundler 
Acked-by: Thibaut VARENE 
Signed-off-by: Kyle McMartin

Add IRQF_IRQPOLL flag on parisc

2007-05-08T18:15:22+00:00

Add IRQF_IRQPOLL to the timer interrupt on parisc.

Signed-off-by: Bernhard Walle 
Cc: Kyle McMartin 
Cc: Matthew Wilcox 
Cc: Grant Grundler 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PARISC] use fls_long in irq.c

2007-02-17T06:00:25+00:00

Signed-off-by: Kyle McMartin

[PARISC] Use set_irq_regs

2006-10-07T11:11:07+00:00

Actually set the irq_regs pointer.

Signed-off-by: Matthew Wilcox

Build fixes for struct pt_regs removal

2006-10-07T02:47:23+00:00

Signed-off-by: Matthew Wilcox

[PARISC] Allow nested interrupts

2006-10-04T12:48:57+00:00

Our prior mode of operation didn't allow nested interrupts
because it makes the interrupt code much simpler.  However,
nested interrupts are better for latency.

This code uses the EIEM register to simulate level interrupts
and thus achieve nesting.

Signed-off-by: James Bottomley 
Signed-off-by: Kyle McMartin

[PARISC] Fix up parisc irq handling for genirq changes

2006-10-04T12:45:59+00:00

Clean up enough to get things compiling again in the interim.

Signed-off-by: Kyle McMartin

[PATCH] irq-flags: PARISC: Use the new IRQF_ constants

2006-07-02T20:58:47+00:00

Use the new IRQF_ constants and remove the SA_INTERRUPT define

Signed-off-by: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "David S. Miller" 
Cc: Benjamin Herrenschmidt 
Cc: Kyle McMartin 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

Remove obsolete #include

2006-06-30T17:25:36+00:00

Signed-off-by: Jörn Engel 
Signed-off-by: Adrian Bunk

[PATCH] genirq: add ->retrigger() irq op to consolidate hw_irq_resend()

2006-06-29T17:26:23+00:00

Add ->retrigger() irq op to consolidate hw_irq_resend() implementations.
(Most architectures had it defined to NOP anyway.)

NOTE: ia64 needs testing. i386 and x86_64 tested.

Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds