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alistair23-linux/arch/sparc64/kernel/sun4v_ivec.S
David S. Miller e18e2a00ef [SPARC64]: Move over to GENERIC_HARDIRQS. 
This is the long overdue conversion of sparc64 over to
the generic IRQ layer.

The kernel image is slightly larger, but the BSS is ~60K
smaller due to the reduced size of struct ino_bucket.

A lot of IRQ implementation details, including ino_bucket,
were moved out of asm-sparc64/irq.h and are now private to
arch/sparc64/kernel/irq.c, and most of the code in irq.c
totally disappeared.

One thing that's different at the moment is IRQ distribution,
we do it at enable_irq() time.  If the cpu mask is ALL then
we round-robin using a global rotating cpu counter, else
we pick the first cpu in the mask to support single cpu
targetting.  This is similar to what powerpc's XICS IRQ
support code does.

This works fine on my UP SB1000, and the SMP build goes
fine and runs on that machine, but lots of testing on
different setups is needed.

Signed-off-by: David S. Miller <davem@davemloft.net>
2006-06-20 01:23:32 -07:00

330 lines
8.3 KiB
ArmAsm
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/* sun4v_ivec.S: Sun4v interrupt vector handling.
*
* Copyright (C) 2006 <davem@davemloft.net>
*/
#include <asm/cpudata.h>
#include <asm/intr_queue.h>
#include <asm/pil.h>
.text
.align 32
sun4v_cpu_mondo:
/* Head offset in %g2, tail offset in %g4.
* If they are the same, no work.
*/
mov INTRQ_CPU_MONDO_HEAD, %g2
ldxa [%g2] ASI_QUEUE, %g2
mov INTRQ_CPU_MONDO_TAIL, %g4
ldxa [%g4] ASI_QUEUE, %g4
cmp %g2, %g4
be,pn %xcc, sun4v_cpu_mondo_queue_empty
nop
/* Get &trap_block[smp_processor_id()] into %g3. */
ldxa [%g0] ASI_SCRATCHPAD, %g3
sub %g3, TRAP_PER_CPU_FAULT_INFO, %g3
/* Get CPU mondo queue base phys address into %g7. */
ldx [%g3 + TRAP_PER_CPU_CPU_MONDO_PA], %g7
/* Now get the cross-call arguments and handler PC, same
* layout as sun4u:
*
* 1st 64-bit word: low half is 32-bit PC, put into %g3 and jmpl to it
* high half is context arg to MMU flushes, into %g5
* 2nd 64-bit word: 64-bit arg, load into %g1
* 3rd 64-bit word: 64-bit arg, load into %g7
*/
ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g3
add %g2, 0x8, %g2
srlx %g3, 32, %g5
ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g1
add %g2, 0x8, %g2
srl %g3, 0, %g3
ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g7
add %g2, 0x40 - 0x8 - 0x8, %g2
/* Update queue head pointer. */
sethi %hi(8192 - 1), %g4
or %g4, %lo(8192 - 1), %g4
and %g2, %g4, %g2
mov INTRQ_CPU_MONDO_HEAD, %g4
stxa %g2, [%g4] ASI_QUEUE
membar #Sync
jmpl %g3, %g0
nop
sun4v_cpu_mondo_queue_empty:
retry
sun4v_dev_mondo:
/* Head offset in %g2, tail offset in %g4. */
mov INTRQ_DEVICE_MONDO_HEAD, %g2
ldxa [%g2] ASI_QUEUE, %g2
mov INTRQ_DEVICE_MONDO_TAIL, %g4
ldxa [%g4] ASI_QUEUE, %g4
cmp %g2, %g4
be,pn %xcc, sun4v_dev_mondo_queue_empty
nop
/* Get &trap_block[smp_processor_id()] into %g3. */
ldxa [%g0] ASI_SCRATCHPAD, %g3
sub %g3, TRAP_PER_CPU_FAULT_INFO, %g3
/* Get DEV mondo queue base phys address into %g5. */
ldx [%g3 + TRAP_PER_CPU_DEV_MONDO_PA], %g5
/* Load IVEC into %g3. */
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
add %g2, 0x40, %g2
/* XXX There can be a full 64-byte block of data here.
* XXX This is how we can get at MSI vector data.
* XXX Current we do not capture this, but when we do we'll
* XXX need to add a 64-byte storage area in the struct ino_bucket
* XXX or the struct irq_desc.
*/
/* Update queue head pointer, this frees up some registers. */
sethi %hi(8192 - 1), %g4
or %g4, %lo(8192 - 1), %g4
and %g2, %g4, %g2
mov INTRQ_DEVICE_MONDO_HEAD, %g4
stxa %g2, [%g4] ASI_QUEUE
membar #Sync
/* Get &__irq_work[smp_processor_id()] into %g1. */
TRAP_LOAD_IRQ_WORK(%g1, %g4)
/* Get &ivector_table[IVEC] into %g4. */
sethi %hi(ivector_table), %g4
sllx %g3, 3, %g3
or %g4, %lo(ivector_table), %g4
add %g4, %g3, %g4
/* Insert ivector_table[] entry into __irq_work[] queue. */
lduw [%g1], %g2 /* g2 = irq_work(cpu) */
stw %g2, [%g4 + 0x00] /* bucket->irq_chain = g2 */
stw %g4, [%g1] /* irq_work(cpu) = bucket */
/* Signal the interrupt by setting (1 << pil) in %softint. */
wr %g0, 1 << PIL_DEVICE_IRQ, %set_softint
sun4v_dev_mondo_queue_empty:
retry
sun4v_res_mondo:
/* Head offset in %g2, tail offset in %g4. */
mov INTRQ_RESUM_MONDO_HEAD, %g2
ldxa [%g2] ASI_QUEUE, %g2
mov INTRQ_RESUM_MONDO_TAIL, %g4
ldxa [%g4] ASI_QUEUE, %g4
cmp %g2, %g4
be,pn %xcc, sun4v_res_mondo_queue_empty
nop
/* Get &trap_block[smp_processor_id()] into %g3. */
ldxa [%g0] ASI_SCRATCHPAD, %g3
sub %g3, TRAP_PER_CPU_FAULT_INFO, %g3
/* Get RES mondo queue base phys address into %g5. */
ldx [%g3 + TRAP_PER_CPU_RESUM_MONDO_PA], %g5
/* Get RES kernel buffer base phys address into %g7. */
ldx [%g3 + TRAP_PER_CPU_RESUM_KBUF_PA], %g7
/* If the first word is non-zero, queue is full. */
ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g1
brnz,pn %g1, sun4v_res_mondo_queue_full
nop
/* Remember this entry's offset in %g1. */
mov %g2, %g1
/* Copy 64-byte queue entry into kernel buffer. */
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
/* Update queue head pointer. */
sethi %hi(8192 - 1), %g4
or %g4, %lo(8192 - 1), %g4
and %g2, %g4, %g2
mov INTRQ_RESUM_MONDO_HEAD, %g4
stxa %g2, [%g4] ASI_QUEUE
membar #Sync
/* Disable interrupts and save register state so we can call
* C code. The etrap handling will leave %g4 in %l4 for us
* when it's done.
*/
rdpr %pil, %g2
wrpr %g0, 15, %pil
mov %g1, %g4
ba,pt %xcc, etrap_irq
rd %pc, %g7
/* Log the event. */
add %sp, PTREGS_OFF, %o0
call sun4v_resum_error
mov %l4, %o1
/* Return from trap. */
ba,pt %xcc, rtrap_irq
nop
sun4v_res_mondo_queue_empty:
retry
sun4v_res_mondo_queue_full:
/* The queue is full, consolidate our damage by setting
* the head equal to the tail. We'll just trap again otherwise.
* Call C code to log the event.
*/
mov INTRQ_RESUM_MONDO_HEAD, %g2
stxa %g4, [%g2] ASI_QUEUE
membar #Sync
rdpr %pil, %g2
wrpr %g0, 15, %pil
ba,pt %xcc, etrap_irq
rd %pc, %g7
call sun4v_resum_overflow
add %sp, PTREGS_OFF, %o0
ba,pt %xcc, rtrap_irq
nop
sun4v_nonres_mondo:
/* Head offset in %g2, tail offset in %g4. */
mov INTRQ_NONRESUM_MONDO_HEAD, %g2
ldxa [%g2] ASI_QUEUE, %g2
mov INTRQ_NONRESUM_MONDO_TAIL, %g4
ldxa [%g4] ASI_QUEUE, %g4
cmp %g2, %g4
be,pn %xcc, sun4v_nonres_mondo_queue_empty
nop
/* Get &trap_block[smp_processor_id()] into %g3. */
ldxa [%g0] ASI_SCRATCHPAD, %g3
sub %g3, TRAP_PER_CPU_FAULT_INFO, %g3
/* Get RES mondo queue base phys address into %g5. */
ldx [%g3 + TRAP_PER_CPU_NONRESUM_MONDO_PA], %g5
/* Get RES kernel buffer base phys address into %g7. */
ldx [%g3 + TRAP_PER_CPU_NONRESUM_KBUF_PA], %g7
/* If the first word is non-zero, queue is full. */
ldxa [%g7 + %g2] ASI_PHYS_USE_EC, %g1
brnz,pn %g1, sun4v_nonres_mondo_queue_full
nop
/* Remember this entry's offset in %g1. */
mov %g2, %g1
/* Copy 64-byte queue entry into kernel buffer. */
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
ldxa [%g5 + %g2] ASI_PHYS_USE_EC, %g3
stxa %g3, [%g7 + %g2] ASI_PHYS_USE_EC
add %g2, 0x08, %g2
/* Update queue head pointer. */
sethi %hi(8192 - 1), %g4
or %g4, %lo(8192 - 1), %g4
and %g2, %g4, %g2
mov INTRQ_NONRESUM_MONDO_HEAD, %g4
stxa %g2, [%g4] ASI_QUEUE
membar #Sync
/* Disable interrupts and save register state so we can call
* C code. The etrap handling will leave %g4 in %l4 for us
* when it's done.
*/
rdpr %pil, %g2
wrpr %g0, 15, %pil
mov %g1, %g4
ba,pt %xcc, etrap_irq
rd %pc, %g7
/* Log the event. */
add %sp, PTREGS_OFF, %o0
call sun4v_nonresum_error
mov %l4, %o1
/* Return from trap. */
ba,pt %xcc, rtrap_irq
nop
sun4v_nonres_mondo_queue_empty:
retry
sun4v_nonres_mondo_queue_full:
/* The queue is full, consolidate our damage by setting
* the head equal to the tail. We'll just trap again otherwise.
* Call C code to log the event.
*/
mov INTRQ_NONRESUM_MONDO_HEAD, %g2
stxa %g4, [%g2] ASI_QUEUE
membar #Sync
rdpr %pil, %g2
wrpr %g0, 15, %pil
ba,pt %xcc, etrap_irq
rd %pc, %g7
call sun4v_nonresum_overflow
add %sp, PTREGS_OFF, %o0
ba,pt %xcc, rtrap_irq
nop
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