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[SPARC64]: Send all device interrupts via one PIL. 

This is the first in a series of cleanups that will hopefully
allow a seamless attempt at using the generic IRQ handling
infrastructure in the Linux kernel.

Define PIL_DEVICE_IRQ and vector all device interrupts through
there.

Get rid of the ugly pil0_dummy_{bucket,desc}, instead vector
the timer interrupt directly to a specific handler since the
timer interrupt is the only event that will be signaled on
PIL 14.

The irq_worklist is now in the per-cpu trap_block[].

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2006-06-20 01:20:00 -07:00
parent 3185d4d287
commit fd0504c321
8 changed files with 103 additions and 144 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/sparc64/kernel/entry.S
View File

@ -22,6 +22,7 @@
#include <asm/estate.h>
#include <asm/auxio.h>
#include <asm/sfafsr.h>
#include <asm/pil.h>
#define curptr g6
@ -434,17 +435,13 @@ do_ivec:
sllx %g3, 5, %g3
or %g2, %lo(ivector_table), %g2
add %g2, %g3, %g3
ldub [%g3 + 0x04], %g4 /* pil */
mov 1, %g2
sllx %g2, %g4, %g2
sllx %g4, 2, %g4
TRAP_LOAD_IRQ_WORK(%g6, %g1)
lduw [%g6 + %g4], %g5 /* g5 = irq_work(cpu, pil) */
lduw [%g6], %g5 /* g5 = irq_work(cpu) */
stw %g5, [%g3 + 0x00] /* bucket->irq_chain = g5 */
stw %g3, [%g6 + %g4] /* irq_work(cpu, pil) = bucket */
wr %g2, 0x0, %set_softint
stw %g3, [%g6] /* irq_work(cpu) = bucket */
wr %g0, 1 << PIL_DEVICE_IRQ, %set_softint
retry
do_ivec_xcall:
mov 0x50, %g1

103
arch/sparc64/kernel/irq.c
View File

@ -68,11 +68,7 @@ struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BY
* access to this structure takes a TLB miss it could cause
* the 5-level sparc v9 trap stack to overflow.
*/
struct irq_work_struct {
unsigned int irq_worklists[16];
};
struct irq_work_struct __irq_work[NR_CPUS];
#define irq_work(__cpu, __pil) &(__irq_work[(__cpu)].irq_worklists[(__pil)])
#define irq_work(__cpu) &(trap_block[(__cpu)].irq_worklist)
static struct irqaction *irq_action[NR_IRQS+1];
@ -91,10 +87,8 @@ static void register_irq_proc (unsigned int irq);
*/
#define put_ino_in_irqaction(action, irq) \
action->flags &= 0xffffffffffffUL; \
if (__bucket(irq) == &pil0_dummy_bucket) \
action->flags |= 0xdeadUL << 48; \
else \
action->flags |= __irq_ino(irq) << 48;
#define get_ino_in_irqaction(action) (action->flags >> 48)
#define put_smpaff_in_irqaction(action, smpaff) (action)->mask = (smpaff)
@ -251,15 +245,6 @@ void disable_irq(unsigned int irq)
}
}
/* The timer is the one "weird" interrupt which is generated by
* the CPU %tick register and not by some normal vectored interrupt
* source. To handle this special case, we use this dummy INO bucket.
*/
static struct irq_desc pil0_dummy_desc;
static struct ino_bucket pil0_dummy_bucket = {
.irq_info = &pil0_dummy_desc,
};
static void build_irq_error(const char *msg, unsigned int ino, int pil, int inofixup,
unsigned long iclr, unsigned long imap,
struct ino_bucket *bucket)
@ -276,15 +261,7 @@ unsigned int build_irq(int pil, int inofixup, unsigned long iclr, unsigned long
struct ino_bucket *bucket;
int ino;
if (pil == 0) {
if (iclr != 0UL || imap != 0UL) {
prom_printf("Invalid dummy bucket for PIL0 (%lx:%lx)\n",
iclr, imap);
prom_halt();
}
return __irq(&pil0_dummy_bucket);
}
BUG_ON(pil == 0);
BUG_ON(tlb_type == hypervisor);
/* RULE: Both must be specified in all other cases. */
@ -371,7 +348,7 @@ static void atomic_bucket_insert(struct ino_bucket *bucket)
__asm__ __volatile__("rdpr %%pstate, %0" : "=r" (pstate));
__asm__ __volatile__("wrpr %0, %1, %%pstate"
: : "r" (pstate), "i" (PSTATE_IE));
ent = irq_work(smp_processor_id(), bucket->pil);
ent = irq_work(smp_processor_id());
bucket->irq_chain = *ent;
*ent = __irq(bucket);
__asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
@ -437,7 +414,7 @@ int request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_
if (unlikely(!bucket->irq_info))
return -ENODEV;
if ((bucket != &pil0_dummy_bucket) && (irqflags & SA_SAMPLE_RANDOM)) {
if (irqflags & SA_SAMPLE_RANDOM) {
/*
* This function might sleep, we want to call it first,
* outside of the atomic block. In SA_STATIC_ALLOC case,
@ -465,12 +442,9 @@ int request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_
}
bucket->flags |= IBF_ACTIVE;
pending = 0;
if (bucket != &pil0_dummy_bucket) {
pending = bucket->pending;
if (pending)
bucket->pending = 0;
}
action->handler = handler;
action->flags = irqflags;
@ -487,12 +461,11 @@ int request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_
/* We ate the IVEC already, this makes sure it does not get lost. */
if (pending) {
atomic_bucket_insert(bucket);
set_softint(1 << bucket->pil);
set_softint(1 << PIL_DEVICE_IRQ);
}
spin_unlock_irqrestore(&irq_action_lock, flags);
if (bucket != &pil0_dummy_bucket)
register_irq_proc(__irq_ino(irq));
#ifdef CONFIG_SMP
@ -533,7 +506,9 @@ void free_irq(unsigned int irq, void *dev_id)
{
struct irqaction *action;
struct ino_bucket *bucket;
struct irq_desc *desc;
unsigned long flags;
int ent, i;
spin_lock_irqsave(&irq_action_lock, flags);
@ -549,9 +524,7 @@ void free_irq(unsigned int irq, void *dev_id)
spin_lock_irqsave(&irq_action_lock, flags);
bucket = __bucket(irq);
if (bucket != &pil0_dummy_bucket) {
struct irq_desc *desc = bucket->irq_info;
int ent, i;
desc = bucket->irq_info;
for (i = 0; i < MAX_IRQ_DESC_ACTION; i++) {
struct irqaction *p = &desc->action[i];
@ -585,7 +558,6 @@ void free_irq(unsigned int irq, void *dev_id)
if (ent == NUM_IVECS)
disable_irq(irq);
}
}
spin_unlock_irqrestore(&irq_action_lock, flags);
}
@ -625,7 +597,7 @@ void synchronize_irq(unsigned int irq)
}
#endif /* CONFIG_SMP */
static void process_bucket(int irq, struct ino_bucket *bp, struct pt_regs *regs)
static void process_bucket(struct ino_bucket *bp, struct pt_regs *regs)
{
struct irq_desc *desc = bp->irq_info;
unsigned char flags = bp->flags;
@ -676,51 +648,54 @@ static void process_bucket(int irq, struct ino_bucket *bp, struct pt_regs *regs)
/* Test and add entropy */
if (random & SA_SAMPLE_RANDOM)
add_interrupt_randomness(irq);
add_interrupt_randomness(bp->pil);
}
out:
bp->flags &= ~IBF_INPROGRESS;
}
#ifndef CONFIG_SMP
extern irqreturn_t timer_interrupt(int, void *, struct pt_regs *);
void timer_irq(int irq, struct pt_regs *regs)
{
unsigned long clr_mask = 1 << irq;
unsigned long tick_mask = tick_ops->softint_mask;
if (get_softint() & tick_mask) {
irq = 0;
clr_mask = tick_mask;
}
clear_softint(clr_mask);
irq_enter();
kstat_this_cpu.irqs[irq]++;
timer_interrupt(irq, NULL, regs);
irq_exit();
}
#endif
void handler_irq(int irq, struct pt_regs *regs)
{
struct ino_bucket *bp;
int cpu = smp_processor_id();
#ifndef CONFIG_SMP
/*
* Check for TICK_INT on level 14 softint.
/* XXX at this point we should be able to assert that
* XXX irq is PIL_DEVICE_IRQ...
*/
{
unsigned long clr_mask = 1 << irq;
unsigned long tick_mask = tick_ops->softint_mask;
if ((irq == 14) && (get_softint() & tick_mask)) {
irq = 0;
clr_mask = tick_mask;
}
clear_softint(clr_mask);
}
#else
clear_softint(1 << irq);
#endif
irq_enter();
kstat_this_cpu.irqs[irq]++;
/* Sliiiick... */
#ifndef CONFIG_SMP
bp = ((irq != 0) ?
__bucket(xchg32(irq_work(cpu, irq), 0)) :
&pil0_dummy_bucket);
#else
bp = __bucket(xchg32(irq_work(cpu, irq), 0));
#endif
bp = __bucket(xchg32(irq_work(cpu), 0));
while (bp) {
struct ino_bucket *nbp = __bucket(bp->irq_chain);
kstat_this_cpu.irqs[bp->pil]++;
bp->irq_chain = 0;
process_bucket(irq, bp, regs);
process_bucket(bp, regs);
bp = nbp;
}
irq_exit();
@ -929,7 +904,7 @@ void init_irqwork_curcpu(void)
{
int cpu = hard_smp_processor_id();
memset(__irq_work + cpu, 0, sizeof(struct irq_work_struct));
trap_block[cpu].irq_worklist = 0;
}
static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type)

13
arch/sparc64/kernel/sun4v_ivec.S
View File

@ -5,6 +5,7 @@
#include <asm/cpudata.h>
#include <asm/intr_queue.h>
#include <asm/pil.h>
.text
.align 32
@ -106,19 +107,13 @@ sun4v_dev_mondo:
or %g4, %lo(ivector_table), %g4
add %g4, %g3, %g4
/* Load IRQ %pil into %g5. */
ldub [%g4 + 0x04], %g5
/* Insert ivector_table[] entry into __irq_work[] queue. */
sllx %g5, 2, %g3
lduw [%g1 + %g3], %g2 /* g2 = irq_work(cpu, pil) */
lduw [%g1], %g2 /* g2 = irq_work(cpu) */
stw %g2, [%g4 + 0x00] /* bucket->irq_chain = g2 */
stw %g4, [%g1 + %g3] /* irq_work(cpu, pil) = bucket */
stw %g4, [%g1] /* irq_work(cpu) = bucket */
/* Signal the interrupt by setting (1 << pil) in %softint. */
mov 1, %g2
sllx %g2, %g5, %g2
wr %g2, 0x0, %set_softint
wr %g0, 1 << PIL_DEVICE_IRQ, %set_softint
sun4v_dev_mondo_queue_empty:
retry

16
arch/sparc64/kernel/time.c
View File

@ -457,7 +457,7 @@ static inline void timer_check_rtc(void)
}
}
static irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
irqreturn_t timer_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
unsigned long ticks, compare, pstate;
@ -1020,19 +1020,9 @@ static unsigned long sparc64_init_timers(void)
return clock;
}
static void sparc64_start_timers(irqreturn_t (*cfunc)(int, void *, struct pt_regs *))
static void sparc64_start_timers(void)
{
unsigned long pstate;
int err;
/* Register IRQ handler. */
err = request_irq(build_irq(0, 0, 0UL, 0UL), cfunc, 0,
"timer", NULL);
if (err) {
prom_printf("Serious problem, cannot register TICK_INT\n");
prom_halt();
}
/* Guarantee that the following sequences execute
* uninterrupted.
@ -1116,7 +1106,7 @@ void __init time_init(void)
/* Now that the interpolator is registered, it is
* safe to start the timer ticking.
*/
sparc64_start_timers(timer_interrupt);
sparc64_start_timers();
timer_ticks_per_nsec_quotient =
(((NSEC_PER_SEC << SPARC64_NSEC_PER_CYC_SHIFT) +

4
arch/sparc64/kernel/traps.c
View File

@ -2544,7 +2544,9 @@ void __init trap_init(void)
(TRAP_PER_CPU_TSB_HUGE !=
offsetof(struct trap_per_cpu, tsb_huge)) ||
(TRAP_PER_CPU_TSB_HUGE_TEMP !=
offsetof(struct trap_per_cpu, tsb_huge_temp)))
offsetof(struct trap_per_cpu, tsb_huge_temp)) ||
(TRAP_PER_CPU_IRQ_WORKLIST !=
offsetof(struct trap_per_cpu, irq_worklist)))
trap_per_cpu_offsets_are_bolixed_dave();
if ((TSB_CONFIG_TSB !=

10
arch/sparc64/kernel/ttable.S
View File

@ -58,13 +58,11 @@ tl0_irq2: BTRAP(0x42)
tl0_irq3: BTRAP(0x43)
tl0_irq4: BTRAP(0x44)
#endif
tl0_irq5: TRAP_IRQ(handler_irq, 5) TRAP_IRQ(handler_irq, 6)
tl0_irq7: TRAP_IRQ(handler_irq, 7) TRAP_IRQ(handler_irq, 8)
tl0_irq9: TRAP_IRQ(handler_irq, 9) TRAP_IRQ(handler_irq, 10)
tl0_irq11: TRAP_IRQ(handler_irq, 11) TRAP_IRQ(handler_irq, 12)
tl0_irq13: TRAP_IRQ(handler_irq, 13)
tl0_irq5: TRAP_IRQ(handler_irq, 5)
tl0_irq6: BTRAP(0x46) BTRAP(0x47) BTRAP(0x48) BTRAP(0x49)
tl0_irq10: BTRAP(0x4a) BTRAP(0x4b) BTRAP(0x4c) BTRAP(0x4d)
#ifndef CONFIG_SMP
tl0_irq14: TRAP_IRQ(handler_irq, 14)
tl0_irq14: TRAP_IRQ(timer_irq, 14)
#else
tl0_irq14: TICK_SMP_IRQ
#endif

19
include/asm-sparc64/cpudata.h
View File

@ -74,8 +74,10 @@ struct trap_per_cpu {
unsigned long tsb_huge;
unsigned long tsb_huge_temp;
/* Dcache line 8: Unused, needed to keep trap_block a power-of-2 in size. */
unsigned long __pad2[4];
/* Dcache line 8: IRQ work list, and keep trap_block a power-of-2 in size. */
unsigned int irq_worklist;
unsigned int __pad1;
unsigned long __pad2[3];
} __attribute__((aligned(64)));
extern struct trap_per_cpu trap_block[NR_CPUS];
extern void init_cur_cpu_trap(struct thread_info *);
@ -119,6 +121,7 @@ extern struct sun4v_2insn_patch_entry __sun4v_2insn_patch,
#define TRAP_PER_CPU_CPU_LIST_PA 0xc8
#define TRAP_PER_CPU_TSB_HUGE 0xd0
#define TRAP_PER_CPU_TSB_HUGE_TEMP 0xd8
#define TRAP_PER_CPU_IRQ_WORKLIST 0xe0
#define TRAP_BLOCK_SZ_SHIFT 8
@ -171,11 +174,8 @@ extern struct sun4v_2insn_patch_entry __sun4v_2insn_patch,
/* Clobbers TMP, loads local processor's IRQ work area into DEST. */
#define TRAP_LOAD_IRQ_WORK(DEST, TMP) \
__GET_CPUID(TMP) \
sethi %hi(__irq_work), DEST; \
sllx TMP, 6, TMP; \
or DEST, %lo(__irq_work), DEST; \
add DEST, TMP, DEST;
TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
add DEST, TRAP_PER_CPU_IRQ_WORKLIST, DEST;
/* Clobbers TMP, loads DEST with current thread info pointer. */
#define TRAP_LOAD_THREAD_REG(DEST, TMP) \
@ -211,9 +211,10 @@ extern struct sun4v_2insn_patch_entry __sun4v_2insn_patch,
TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
ldx [DEST + TRAP_PER_CPU_PGD_PADDR], DEST;
/* Clobbers TMP, loads local processor's IRQ work area into DEST. */
#define TRAP_LOAD_IRQ_WORK(DEST, TMP) \
sethi %hi(__irq_work), DEST; \
or DEST, %lo(__irq_work), DEST;
TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \
add DEST, TRAP_PER_CPU_IRQ_WORKLIST, DEST;
#define TRAP_LOAD_THREAD_REG(DEST, TMP) \
TRAP_LOAD_TRAP_BLOCK(DEST, TMP) \

7
include/asm-sparc64/pil.h
View File

@ -5,9 +5,9 @@
/* To avoid some locking problems, we hard allocate certain PILs
* for SMP cross call messages that must do a etrap/rtrap.
*
* A cli() does not block the cross call delivery, so when SMP
* locking is an issue we reschedule the event into a PIL interrupt
* which is blocked by cli().
* A local_irq_disable() does not block the cross call delivery, so
* when SMP locking is an issue we reschedule the event into a PIL
* interrupt which is blocked by local_irq_disable().
*
* In fact any XCALL which has to etrap/rtrap has a problem because
* it is difficult to prevent rtrap from running BH's, and that would
@ -17,6 +17,7 @@
#define PIL_SMP_RECEIVE_SIGNAL 2
#define PIL_SMP_CAPTURE 3
#define PIL_SMP_CTX_NEW_VERSION 4
#define PIL_DEVICE_IRQ 5
#ifndef __ASSEMBLY__
#define PIL_RESERVED(PIL) ((PIL) == PIL_SMP_CALL_FUNC || \