linux-toradex.git/arch/sparc/kernel/entry.S, branch v3.0.65

sparc: sun4m SMP: fix wrong shift instruction in IPI handler

2011-07-16T17:45:12+00:00

This shift instruction appears to be shifting in the wrong direction.
Without this change, my SparcStation-20MP hangs just after bringing up
the second CPU:

Entering SMP Mode...
Starting CPU 2 at f02b4e90
Brought up 2 CPUs
Total of 2 processors activated (99.52 BogoMIPS).
   *** stuck ***

Signed-off-by: Will Simoneau 
Signed-off-by: David S. Miller

sparc32, sun4m: bugfix in SMP IPI traphandler

2011-06-09T23:12:34+00:00

Three new IPIs were introduced by commit
ecbc42b70acbc6327adefe9635db93fcf62bf59d ("sparc32, sun4m:
Implemented SMP IPIs support for SUN4M machines"), the
old handler was already prepared for IPIs but handled only
IRQ14 and IRQ13, this patch adds support for the new IPI at
IRQ12.

The IPI trap handler looks at the mask rather than the
pending IRQ/IPI, this bug may have masked the problem
above, introduced by the same commit.

Signed-off-by: Daniel Hellstrom 
Signed-off-by: David S. Miller

sparc32: added CONFIG_PCIC_PCI Kconfig setting

2011-06-02T21:32:37+00:00

Signed-off-by: Daniel Hellstrom 
Signed-off-by: David S. Miller

sparc32, sun4m: Implemented SMP IPIs support for SUN4M machines

2011-05-16T20:07:44+00:00

Implement the three IPIs (resched, single and cpu-mask) generation
and interrupt handler catch. The sun4m has 15 soft-IRQs and three
of them is used with this patch, the three IPIs was previously
implemented with the cross-call IRQ15 which does not work with
locking routines such as spinlocks because IRQ15 is NMI, it may
cause deadlock.

The IRQ trap handler code assumes (in the same spritit as the old
it seems) that hard interrupts will be generated until handled
(level), when a IRQ happens the IRQ pending register is checked
for pending soft-IRQs. When both hard and soft IRQ happens at the
same time only soft-IRQs are handled.

The old code implemented a soft-IRQ traphandler at IRQ14 which
called smp_reschedule_irq which in turn called set_need_resched.
It seems to be an old relic and is replaced with the interrupt
traphander exit code RESTORE_ALL, it calls schedule() when
appropriate.

Signed-off-by: Daniel Hellstrom 
Signed-off-by: David S. Miller

sparc32,leon: Implemented SMP IPIs for LEON CPU

2011-05-16T20:07:43+00:00

This patch implements SMP IPIs on LEON using software generated
IRQs to signal between CPUs.

The IPI IRQ number is set by using the ipi_num property in the
device tree, or defaults to 13. LEON SMP systems should reserve
IRQ 13 (and IRQ 15) to Linux in order for the defaults to work.

Signed-off-by: Daniel Hellstrom 
Signed-off-by: David S. Miller

sparc32,leon: per-cpu ticker use genirq per-cpu handler

2011-04-21T22:31:30+00:00

Signed-off-by: Daniel Hellstrom 
Acked-by: Sam Ravnborg 
Signed-off-by: David S. Miller

Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6

2011-04-07T18:14:49+00:00

* 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6:
  Fix common misspellings

Fix common misspellings

2011-03-31T14:26:23+00:00

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi

sparc32: Pass task_struct to schedule_tail() in ret_from_fork

2011-03-31T07:52:38+00:00

We have to pass task_struct of previous process to function
schedule_tail(). Currently in ret_from_fork previous thread_info
is passed:

switch_to: mov %g6, %g3 /* previous thread_info in g6 */

ret_from_fork: call    schedule_tail
                mov    %g3, %o0 /* previous thread_info is passed */

void schedule_tail(struct task_struct *prev);

Signed-off-by: Tkhai Kirill 
Signed-off-by: David S. Miller

sparc64: Add syscall tracepoint support.

2009-12-11T08:44:47+00:00

Signed-off-by: David S. Miller