#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/bootmem.h>
+#include <linux/irq.h>
#include <asm/ptrace.h>
#include <asm/processor.h>
#include <asm/auxio.h>
#include <asm/head.h>
-#ifdef CONFIG_SMP
-static void distribute_irqs(void);
-#endif
-
/* UPA nodes send interrupt packet to UltraSparc with first data reg
* value low 5 (7 on Starfire) bits holding the IRQ identifier being
* delivered. We must translate this into a non-vector IRQ so we can
* The IVEC handler does not need to act atomically, the PIL dispatch
* code uses CAS to get an atomic snapshot of the list and clear it
* at the same time.
+ *
+ * If you make changes to ino_bucket, please update hand coded assembler
+ * of the vectored interrupt trap handler(s) in entry.S and sun4v_ivec.S
*/
+struct ino_bucket {
+ /* Next handler in per-CPU IRQ worklist. We know that
+ * bucket pointers have the high 32-bits clear, so to
+ * save space we only store the bits we need.
+ */
+/*0x00*/unsigned int irq_chain;
+ /* Virtual interrupt number assigned to this INO. */
+/*0x04*/unsigned int virt_irq;
+};
+
+#define NUM_IVECS (IMAP_INR + 1)
struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BYTES)));
+#define __irq_ino(irq) \
+ (((struct ino_bucket *)(unsigned long)(irq)) - &ivector_table[0])
+#define __bucket(irq) ((struct ino_bucket *)(unsigned long)(irq))
+#define __irq(bucket) ((unsigned int)(unsigned long)(bucket))
+
/* This has to be in the main kernel image, it cannot be
* turned into per-cpu data. The reason is that the main
* kernel image is locked into the TLB and this structure
*/
#define irq_work(__cpu) &(trap_block[(__cpu)].irq_worklist)
-static struct irqaction timer_irq_action = {
- .name = "timer",
-};
-static struct irqaction *irq_action[NR_IRQS] = { &timer_irq_action, };
-
-/* This only synchronizes entities which modify IRQ handler
- * state and some selected user-level spots that want to
- * read things in the table. IRQ handler processing orders
- * its' accesses such that no locking is needed.
- */
-static DEFINE_SPINLOCK(irq_action_lock);
-
static unsigned int virt_to_real_irq_table[NR_IRQS];
static unsigned char virt_irq_cur = 1;
return virt_to_real_irq_table[virt_irq];
}
-void irq_install_pre_handler(int virt_irq,
- void (*func)(struct ino_bucket *, void *, void *),
- void *arg1, void *arg2)
-{
- unsigned int real_irq = virt_to_real_irq(virt_irq);
- struct ino_bucket *bucket;
- struct irq_desc *d;
-
- if (unlikely(!real_irq))
- return;
-
- bucket = __bucket(real_irq);
- d = bucket->irq_info;
- d->pre_handler = func;
- d->pre_handler_arg1 = arg1;
- d->pre_handler_arg2 = arg2;
-}
-
-static void register_irq_proc (unsigned int irq);
-
/*
- * Upper 2b of irqaction->flags holds the ino.
- * irqaction->mask holds the smp affinity information.
+ * /proc/interrupts printing:
*/
-#define put_ino_in_irqaction(action, irq) \
- action->flags &= 0xffffffffffffUL; \
- 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)
-#define get_smpaff_in_irqaction(action) ((action)->mask)
int show_interrupts(struct seq_file *p, void *v)
{
+ int i = *(loff_t *) v, j;
+ struct irqaction * action;
unsigned long flags;
- int i = *(loff_t *) v;
- struct irqaction *action;
-#ifdef CONFIG_SMP
- int j;
-#endif
- spin_lock_irqsave(&irq_action_lock, flags);
- if (i <= NR_IRQS) {
- if (!(action = *(i + irq_action)))
- goto out_unlock;
- seq_printf(p, "%3d: ", i);
+ if (i == 0) {
+ seq_printf(p, " ");
+ for_each_online_cpu(j)
+ seq_printf(p, "CPU%d ",j);
+ seq_putc(p, '\n');
+ }
+
+ if (i < NR_IRQS) {
+ spin_lock_irqsave(&irq_desc[i].lock, flags);
+ action = irq_desc[i].action;
+ if (!action)
+ goto skip;
+ seq_printf(p, "%3d: ",i);
#ifndef CONFIG_SMP
seq_printf(p, "%10u ", kstat_irqs(i));
#else
- for_each_online_cpu(j) {
- seq_printf(p, "%10u ",
- kstat_cpu(j).irqs[i]);
- }
+ for_each_online_cpu(j)
+ seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
#endif
- seq_printf(p, " %s", action->name);
- for (action = action->next; action; action = action->next)
+ seq_printf(p, " %9s", irq_desc[i].handler->typename);
+ seq_printf(p, " %s", action->name);
+
+ for (action=action->next; action; action = action->next)
seq_printf(p, ", %s", action->name);
+
seq_putc(p, '\n');
+skip:
+ spin_unlock_irqrestore(&irq_desc[i].lock, flags);
}
-out_unlock:
- spin_unlock_irqrestore(&irq_action_lock, flags);
-
return 0;
}
return tid;
}
-void enable_irq(unsigned int virt_irq)
-{
- unsigned int real_irq = virt_to_real_irq(virt_irq);
- struct ino_bucket *bucket;
- unsigned long imap, cpuid;
-
- if (unlikely(!real_irq))
- return;
+struct irq_handler_data {
+ unsigned long iclr;
+ unsigned long imap;
- bucket = __bucket(real_irq);
- imap = bucket->imap;
- if (unlikely(imap == 0UL))
- return;
-
- preempt_disable();
-
- /* This gets the physical processor ID, even on uniprocessor,
- * so we can always program the interrupt target correctly.
- */
- cpuid = real_hard_smp_processor_id();
-
- if (tlb_type == hypervisor) {
- unsigned int ino = __irq_ino(real_irq);
- int err;
-
- err = sun4v_intr_settarget(ino, cpuid);
- if (err != HV_EOK)
- printk("sun4v_intr_settarget(%x,%lu): err(%d)\n",
- ino, cpuid, err);
- err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
- if (err != HV_EOK)
- printk("sun4v_intr_setenabled(%x): err(%d)\n",
- ino, err);
- } else {
- unsigned int tid = sun4u_compute_tid(imap, cpuid);
-
- /* NOTE NOTE NOTE, IGN and INO are read-only, IGN is a product
- * of this SYSIO's preconfigured IGN in the SYSIO Control
- * Register, the hardware just mirrors that value here.
- * However for Graphics and UPA Slave devices the full
- * IMAP_INR field can be set by the programmer here.
- *
- * Things like FFB can now be handled via the new IRQ
- * mechanism.
- */
- upa_writel(tid | IMAP_VALID, imap);
- }
-
- preempt_enable();
-}
+ void (*pre_handler)(unsigned int, void *, void *);
+ void *pre_handler_arg1;
+ void *pre_handler_arg2;
+};
-void disable_irq(unsigned int virt_irq)
+static inline struct ino_bucket *virt_irq_to_bucket(unsigned int virt_irq)
{
unsigned int real_irq = virt_to_real_irq(virt_irq);
- struct ino_bucket *bucket;
- unsigned long imap;
+ struct ino_bucket *bucket = NULL;
- if (unlikely(!real_irq))
- return;
-
- bucket = __bucket(real_irq);
- imap = bucket->imap;
- if (unlikely(imap == 0UL))
- return;
-
- if (tlb_type == hypervisor) {
- unsigned int ino = __irq_ino(real_irq);
- int err;
+ if (likely(real_irq))
+ bucket = __bucket(real_irq);
- err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
- if (err != HV_EOK)
- printk("sun4v_intr_setenabled(%x): "
- "err(%d)\n", ino, err);
- } else {
- u32 tmp;
-
- /* NOTE: We do not want to futz with the IRQ clear registers
- * and move the state to IDLE, the SCSI code does call
- * disable_irq() to assure atomicity in the queue cmd
- * SCSI adapter driver code. Thus we'd lose interrupts.
- */
- tmp = upa_readl(imap);
- tmp &= ~IMAP_VALID;
- upa_writel(tmp, imap);
- }
+ return bucket;
}
-static void build_irq_error(const char *msg, unsigned int ino, int inofixup,
- unsigned long iclr, unsigned long imap,
- struct ino_bucket *bucket)
+#ifdef CONFIG_SMP
+static int irq_choose_cpu(unsigned int virt_irq)
{
- prom_printf("IRQ: INO %04x (%016lx:%016lx) --> "
- "(%d:%016lx:%016lx), halting...\n",
- ino, bucket->iclr, bucket->imap,
- inofixup, iclr, imap);
- prom_halt();
-}
+ cpumask_t mask = irq_affinity[virt_irq];
+ int cpuid;
-unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap, unsigned char flags)
-{
- struct ino_bucket *bucket;
- int ino;
+ if (cpus_equal(mask, CPU_MASK_ALL)) {
+ static int irq_rover;
+ static DEFINE_SPINLOCK(irq_rover_lock);
+ unsigned long flags;
- BUG_ON(tlb_type == hypervisor);
+ /* Round-robin distribution... */
+ do_round_robin:
+ spin_lock_irqsave(&irq_rover_lock, flags);
- /* RULE: Both must be specified. */
- if (iclr == 0UL || imap == 0UL) {
- prom_printf("Invalid build_irq %d %016lx %016lx\n",
- inofixup, iclr, imap);
- prom_halt();
- }
-
- ino = (upa_readl(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
- if (ino > NUM_IVECS) {
- prom_printf("Invalid INO %04x (%d:%016lx:%016lx)\n",
- ino, inofixup, iclr, imap);
- prom_halt();
- }
+ while (!cpu_online(irq_rover)) {
+ if (++irq_rover >= NR_CPUS)
+ irq_rover = 0;
+ }
+ cpuid = irq_rover;
+ do {
+ if (++irq_rover >= NR_CPUS)
+ irq_rover = 0;
+ } while (!cpu_online(irq_rover));
- bucket = &ivector_table[ino];
- if (bucket->flags & IBF_ACTIVE)
- build_irq_error("IRQ: Trying to build active INO bucket.\n",
- ino, inofixup, iclr, imap, bucket);
+ spin_unlock_irqrestore(&irq_rover_lock, flags);
+ } else {
+ cpumask_t tmp;
- if (bucket->irq_info) {
- if (bucket->imap != imap || bucket->iclr != iclr)
- build_irq_error("IRQ: Trying to reinit INO bucket.\n",
- ino, inofixup, iclr, imap, bucket);
+ cpus_and(tmp, cpu_online_map, mask);
- goto out;
- }
+ if (cpus_empty(tmp))
+ goto do_round_robin;
- bucket->irq_info = kzalloc(sizeof(struct irq_desc), GFP_ATOMIC);
- if (!bucket->irq_info) {
- prom_printf("IRQ: Error, kmalloc(irq_desc) failed.\n");
- prom_halt();
+ cpuid = first_cpu(tmp);
}
- /* Ok, looks good, set it up. Don't touch the irq_chain or
- * the pending flag.
- */
- bucket->imap = imap;
- bucket->iclr = iclr;
- if (!bucket->virt_irq)
- bucket->virt_irq = virt_irq_alloc(__irq(bucket));
- bucket->flags = flags;
-
-out:
- return bucket->virt_irq;
+ return cpuid;
+}
+#else
+static int irq_choose_cpu(unsigned int virt_irq)
+{
+ return real_hard_smp_processor_id();
}
+#endif
-unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino, unsigned char flags)
+static void sun4u_irq_enable(unsigned int virt_irq)
{
- struct ino_bucket *bucket;
- unsigned long sysino;
+ irq_desc_t *desc = irq_desc + virt_irq;
+ struct irq_handler_data *data = desc->handler_data;
- sysino = sun4v_devino_to_sysino(devhandle, devino);
+ if (likely(data)) {
+ unsigned long cpuid, imap;
+ unsigned int tid;
- bucket = &ivector_table[sysino];
+ cpuid = irq_choose_cpu(virt_irq);
+ imap = data->imap;
- /* Catch accidental accesses to these things. IMAP/ICLR handling
- * is done by hypervisor calls on sun4v platforms, not by direct
- * register accesses.
- *
- * But we need to make them look unique for the disable_irq() logic
- * in free_irq().
- */
- bucket->imap = ~0UL - sysino;
- bucket->iclr = ~0UL - sysino;
- if (!bucket->virt_irq)
- bucket->virt_irq = virt_irq_alloc(__irq(bucket));
- bucket->flags = flags;
+ tid = sun4u_compute_tid(imap, cpuid);
- bucket->irq_info = kzalloc(sizeof(struct irq_desc), GFP_ATOMIC);
- if (!bucket->irq_info) {
- prom_printf("IRQ: Error, kmalloc(irq_desc) failed.\n");
- prom_halt();
+ upa_writel(tid | IMAP_VALID, imap);
}
-
- return bucket->virt_irq;
}
-static void atomic_bucket_insert(struct ino_bucket *bucket)
+static void sun4u_irq_disable(unsigned int virt_irq)
{
- unsigned long pstate;
- unsigned int *ent;
+ irq_desc_t *desc = irq_desc + virt_irq;
+ struct irq_handler_data *data = desc->handler_data;
- __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->irq_chain = *ent;
- *ent = __irq(bucket);
- __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
-}
+ if (likely(data)) {
+ unsigned long imap = data->imap;
+ u32 tmp = upa_readl(imap);
-static int check_irq_sharing(int pil, unsigned long irqflags)
-{
- struct irqaction *action;
-
- action = *(irq_action + pil);
- if (action) {
- if (!(action->flags & SA_SHIRQ) || !(irqflags & SA_SHIRQ))
- return -EBUSY;
+ tmp &= ~IMAP_VALID;
+ upa_writel(tmp, imap);
}
- return 0;
}
-static void append_irq_action(int pil, struct irqaction *action)
+static void sun4u_irq_end(unsigned int virt_irq)
{
- struct irqaction **pp = irq_action + pil;
+ irq_desc_t *desc = irq_desc + virt_irq;
+ struct irq_handler_data *data = desc->handler_data;
- while (*pp)
- pp = &((*pp)->next);
- *pp = action;
+ if (likely(data))
+ upa_writel(ICLR_IDLE, data->iclr);
}
-static struct irqaction *get_action_slot(struct ino_bucket *bucket)
+static void sun4v_irq_enable(unsigned int virt_irq)
{
- struct irq_desc *desc = bucket->irq_info;
- int max_irq, i;
+ struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
+ unsigned int ino = bucket - &ivector_table[0];
- max_irq = 1;
- if (bucket->flags & IBF_PCI)
- max_irq = MAX_IRQ_DESC_ACTION;
- for (i = 0; i < max_irq; i++) {
- struct irqaction *p = &desc->action[i];
- u32 mask = (1 << i);
+ if (likely(bucket)) {
+ unsigned long cpuid;
+ int err;
- if (desc->action_active_mask & mask)
- continue;
+ cpuid = irq_choose_cpu(virt_irq);
- desc->action_active_mask |= mask;
- return p;
+ err = sun4v_intr_settarget(ino, cpuid);
+ if (err != HV_EOK)
+ printk("sun4v_intr_settarget(%x,%lu): err(%d)\n",
+ ino, cpuid, err);
+ err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
+ if (err != HV_EOK)
+ printk("sun4v_intr_setenabled(%x): err(%d)\n",
+ ino, err);
}
- return NULL;
}
-int request_irq(unsigned int virt_irq,
- irqreturn_t (*handler)(int, void *, struct pt_regs *),
- unsigned long irqflags, const char *name, void *dev_id)
+static void sun4v_irq_disable(unsigned int virt_irq)
{
- struct irqaction *action;
- struct ino_bucket *bucket;
- unsigned long flags;
- unsigned int real_irq;
- int pending = 0;
-
- real_irq = virt_to_real_irq(virt_irq);
- if (unlikely(!real_irq))
- return -EINVAL;
-
- if (unlikely(!handler))
- return -EINVAL;
-
- bucket = __bucket(real_irq);
- if (unlikely(!bucket->irq_info))
- return -ENODEV;
-
- if (irqflags & SA_SAMPLE_RANDOM) {
- /*
- * This function might sleep, we want to call it first,
- * outside of the atomic block.
- * Yes, this might clear the entropy pool if the wrong
- * driver is attempted to be loaded, without actually
- * installing a new handler, but is this really a problem,
- * only the sysadmin is able to do this.
- */
- rand_initialize_irq(virt_irq);
- }
-
- spin_lock_irqsave(&irq_action_lock, flags);
+ struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
+ unsigned int ino = bucket - &ivector_table[0];
- if (check_irq_sharing(virt_irq, irqflags)) {
- spin_unlock_irqrestore(&irq_action_lock, flags);
- return -EBUSY;
- }
+ if (likely(bucket)) {
+ int err;
- action = get_action_slot(bucket);
- if (!action) {
- spin_unlock_irqrestore(&irq_action_lock, flags);
- return -ENOMEM;
+ err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED);
+ if (err != HV_EOK)
+ printk("sun4v_intr_setenabled(%x): "
+ "err(%d)\n", ino, err);
}
+}
- bucket->flags |= IBF_ACTIVE;
- pending = bucket->pending;
- if (pending)
- bucket->pending = 0;
-
- action->handler = handler;
- action->flags = irqflags;
- action->name = name;
- action->next = NULL;
- action->dev_id = dev_id;
- put_ino_in_irqaction(action, __irq_ino(real_irq));
- put_smpaff_in_irqaction(action, CPU_MASK_NONE);
-
- append_irq_action(virt_irq, action);
+static void sun4v_irq_end(unsigned int virt_irq)
+{
+ struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
+ unsigned int ino = bucket - &ivector_table[0];
- enable_irq(virt_irq);
+ if (likely(bucket)) {
+ int err;
- /* We ate the IVEC already, this makes sure it does not get lost. */
- if (pending) {
- atomic_bucket_insert(bucket);
- set_softint(1 << PIL_DEVICE_IRQ);
+ err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
+ if (err != HV_EOK)
+ printk("sun4v_intr_setstate(%x): "
+ "err(%d)\n", ino, err);
}
-
- spin_unlock_irqrestore(&irq_action_lock, flags);
-
- register_irq_proc(virt_irq);
-
-#ifdef CONFIG_SMP
- distribute_irqs();
-#endif
- return 0;
}
-EXPORT_SYMBOL(request_irq);
-
-static struct irqaction *unlink_irq_action(unsigned int virt_irq, void *dev_id)
+static void run_pre_handler(unsigned int virt_irq)
{
- struct irqaction *action, **pp;
-
- pp = irq_action + virt_irq;
- action = *pp;
- if (unlikely(!action))
- return NULL;
+ struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
+ irq_desc_t *desc = irq_desc + virt_irq;
+ struct irq_handler_data *data = desc->handler_data;
- if (unlikely(!action->handler)) {
- printk("Freeing free IRQ %d\n", virt_irq);
- return NULL;
+ if (likely(data->pre_handler)) {
+ data->pre_handler(__irq_ino(__irq(bucket)),
+ data->pre_handler_arg1,
+ data->pre_handler_arg2);
}
-
- while (action && action->dev_id != dev_id) {
- pp = &action->next;
- action = *pp;
- }
-
- if (likely(action))
- *pp = action->next;
-
- return action;
}
-void free_irq(unsigned int virt_irq, void *dev_id)
-{
- struct irqaction *action;
- struct ino_bucket *bucket;
- struct irq_desc *desc;
- unsigned long flags;
- unsigned int real_irq;
- int ent, i;
-
- real_irq = virt_to_real_irq(virt_irq);
- if (unlikely(!real_irq))
- return;
+static struct hw_interrupt_type sun4u_irq = {
+ .typename = "sun4u",
+ .enable = sun4u_irq_enable,
+ .disable = sun4u_irq_disable,
+ .end = sun4u_irq_end,
+};
- spin_lock_irqsave(&irq_action_lock, flags);
+static struct hw_interrupt_type sun4u_irq_ack = {
+ .typename = "sun4u+ack",
+ .enable = sun4u_irq_enable,
+ .disable = sun4u_irq_disable,
+ .ack = run_pre_handler,
+ .end = sun4u_irq_end,
+};
- action = unlink_irq_action(virt_irq, dev_id);
+static struct hw_interrupt_type sun4v_irq = {
+ .typename = "sun4v",
+ .enable = sun4v_irq_enable,
+ .disable = sun4v_irq_disable,
+ .end = sun4v_irq_end,
+};
- spin_unlock_irqrestore(&irq_action_lock, flags);
+static struct hw_interrupt_type sun4v_irq_ack = {
+ .typename = "sun4v+ack",
+ .enable = sun4v_irq_enable,
+ .disable = sun4v_irq_disable,
+ .ack = run_pre_handler,
+ .end = sun4v_irq_end,
+};
- if (unlikely(!action))
- return;
+void irq_install_pre_handler(int virt_irq,
+ void (*func)(unsigned int, void *, void *),
+ void *arg1, void *arg2)
+{
+ irq_desc_t *desc = irq_desc + virt_irq;
+ struct irq_handler_data *data = desc->handler_data;
- synchronize_irq(virt_irq);
+ data->pre_handler = func;
+ data->pre_handler_arg1 = arg1;
+ data->pre_handler_arg2 = arg2;
- spin_lock_irqsave(&irq_action_lock, flags);
+ desc->handler = (desc->handler == &sun4u_irq ?
+ &sun4u_irq_ack : &sun4v_irq_ack);
+}
- bucket = __bucket(real_irq);
- desc = bucket->irq_info;
+unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap)
+{
+ struct ino_bucket *bucket;
+ struct irq_handler_data *data;
+ irq_desc_t *desc;
+ int ino;
- for (i = 0; i < MAX_IRQ_DESC_ACTION; i++) {
- struct irqaction *p = &desc->action[i];
+ BUG_ON(tlb_type == hypervisor);
- if (p == action) {
- desc->action_active_mask &= ~(1 << i);
- break;
- }
+ ino = (upa_readl(imap) & (IMAP_IGN | IMAP_INO)) + inofixup;
+ bucket = &ivector_table[ino];
+ if (!bucket->virt_irq) {
+ bucket->virt_irq = virt_irq_alloc(__irq(bucket));
+ irq_desc[bucket->virt_irq].handler = &sun4u_irq;
}
- if (!desc->action_active_mask) {
- unsigned long imap = bucket->imap;
-
- /* This unique interrupt source is now inactive. */
- bucket->flags &= ~IBF_ACTIVE;
-
- /* See if any other buckets share this bucket's IMAP
- * and are still active.
- */
- for (ent = 0; ent < NUM_IVECS; ent++) {
- struct ino_bucket *bp = &ivector_table[ent];
- if (bp != bucket &&
- bp->imap == imap &&
- (bp->flags & IBF_ACTIVE) != 0)
- break;
- }
+ desc = irq_desc + bucket->virt_irq;
+ if (unlikely(desc->handler_data))
+ goto out;
- /* Only disable when no other sub-irq levels of
- * the same IMAP are active.
- */
- if (ent == NUM_IVECS)
- disable_irq(virt_irq);
+ data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
+ if (unlikely(!data)) {
+ prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
+ prom_halt();
}
+ desc->handler_data = data;
- spin_unlock_irqrestore(&irq_action_lock, flags);
-}
+ data->imap = imap;
+ data->iclr = iclr;
-EXPORT_SYMBOL(free_irq);
+out:
+ return bucket->virt_irq;
+}
-#ifdef CONFIG_SMP
-void synchronize_irq(unsigned int virt_irq)
+unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino)
{
- unsigned int real_irq = virt_to_real_irq(virt_irq);
struct ino_bucket *bucket;
+ struct irq_handler_data *data;
+ unsigned long sysino;
+ irq_desc_t *desc;
- if (unlikely(!real_irq))
- return;
+ BUG_ON(tlb_type != hypervisor);
- bucket = __bucket(real_irq);
-#if 0
- /* The following is how I wish I could implement this.
- * Unfortunately the ICLR registers are read-only, you can
- * only write ICLR_foo values to them. To get the current
- * IRQ status you would need to get at the IRQ diag registers
- * in the PCI/SBUS controller and the layout of those vary
- * from one controller to the next, sigh... -DaveM
- */
- unsigned long iclr = bucket->iclr;
-
- while (1) {
- u32 tmp = upa_readl(iclr);
-
- if (tmp == ICLR_TRANSMIT ||
- tmp == ICLR_PENDING) {
- cpu_relax();
- continue;
- }
- break;
+ sysino = sun4v_devino_to_sysino(devhandle, devino);
+ bucket = &ivector_table[sysino];
+ if (!bucket->virt_irq) {
+ bucket->virt_irq = virt_irq_alloc(__irq(bucket));
+ irq_desc[bucket->virt_irq].handler = &sun4v_irq;
}
-#else
- /* So we have to do this with a INPROGRESS bit just like x86. */
- while (bucket->flags & IBF_INPROGRESS)
- cpu_relax();
-#endif
-}
-#endif /* CONFIG_SMP */
-
-static void process_bucket(struct ino_bucket *bp, struct pt_regs *regs)
-{
- struct irq_desc *desc = bp->irq_info;
- unsigned char flags = bp->flags;
- u32 action_mask, i;
- int random;
-
- bp->flags |= IBF_INPROGRESS;
- if (unlikely(!(flags & IBF_ACTIVE))) {
- bp->pending = 1;
+ desc = irq_desc + bucket->virt_irq;
+ if (unlikely(desc->handler_data))
goto out;
- }
-
- if (desc->pre_handler)
- desc->pre_handler(bp,
- desc->pre_handler_arg1,
- desc->pre_handler_arg2);
- action_mask = desc->action_active_mask;
- random = 0;
- for (i = 0; i < MAX_IRQ_DESC_ACTION; i++) {
- struct irqaction *p = &desc->action[i];
- u32 mask = (1 << i);
+ data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC);
+ if (unlikely(!data)) {
+ prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n");
+ prom_halt();
+ }
+ desc->handler_data = data;
- if (!(action_mask & mask))
- continue;
+ /* Catch accidental accesses to these things. IMAP/ICLR handling
+ * is done by hypervisor calls on sun4v platforms, not by direct
+ * register accesses.
+ */
+ data->imap = ~0UL;
+ data->iclr = ~0UL;
- action_mask &= ~mask;
+out:
+ return bucket->virt_irq;
+}
- if (p->handler(bp->virt_irq, p->dev_id, regs) == IRQ_HANDLED)
- random |= p->flags;
+void hw_resend_irq(struct hw_interrupt_type *handler, unsigned int virt_irq)
+{
+ struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
+ unsigned long pstate;
+ unsigned int *ent;
- if (!action_mask)
- break;
- }
+ __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->irq_chain = *ent;
+ *ent = __irq(bucket);
+ set_softint(1 << PIL_DEVICE_IRQ);
+ __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate));
+}
- if (tlb_type == hypervisor) {
- unsigned int ino = __irq_ino(bp);
- int err;
+void ack_bad_irq(unsigned int virt_irq)
+{
+ struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq);
+ unsigned int ino = 0xdeadbeef;
- err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE);
- if (err != HV_EOK)
- printk("sun4v_intr_setstate(%x): "
- "err(%d)\n", ino, err);
- } else {
- upa_writel(ICLR_IDLE, bp->iclr);
- }
+ if (bucket)
+ ino = bucket - &ivector_table[0];
- /* Test and add entropy */
- if (random & SA_SAMPLE_RANDOM)
- add_interrupt_randomness(bp->virt_irq);
-out:
- bp->flags &= ~IBF_INPROGRESS;
+ printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n",
+ ino, virt_irq);
}
#ifndef CONFIG_SMP
clear_softint(clr_mask);
irq_enter();
+
kstat_this_cpu.irqs[0]++;
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();
+ struct ino_bucket *bucket;
- /* XXX at this point we should be able to assert that
- * XXX irq is PIL_DEVICE_IRQ...
- */
clear_softint(1 << irq);
irq_enter();
/* Sliiiick... */
- bp = __bucket(xchg32(irq_work(cpu), 0));
- while (bp) {
- struct ino_bucket *nbp = __bucket(bp->irq_chain);
+ bucket = __bucket(xchg32(irq_work(smp_processor_id()), 0));
+ while (bucket) {
+ struct ino_bucket *next = __bucket(bucket->irq_chain);
- kstat_this_cpu.irqs[bp->virt_irq]++;
+ bucket->irq_chain = 0;
+ __do_IRQ(bucket->virt_irq, regs);
- bp->irq_chain = 0;
- process_bucket(bp, regs);
- bp = nbp;
+ bucket = next;
}
+
irq_exit();
}
EXPORT_SYMBOL(sparc_floppy_irq);
#endif
-/* We really don't need these at all on the Sparc. We only have
- * stubs here because they are exported to modules.
- */
-unsigned long probe_irq_on(void)
-{
- return 0;
-}
-
-EXPORT_SYMBOL(probe_irq_on);
-
-int probe_irq_off(unsigned long mask)
-{
- return 0;
-}
-
-EXPORT_SYMBOL(probe_irq_off);
-
-#ifdef CONFIG_SMP
-static int retarget_one_irq(struct irqaction *p, int goal_cpu)
-{
- struct ino_bucket *bucket = get_ino_in_irqaction(p) + ivector_table;
-
- while (!cpu_online(goal_cpu)) {
- if (++goal_cpu >= NR_CPUS)
- goal_cpu = 0;
- }
-
- if (tlb_type == hypervisor) {
- unsigned int ino = __irq_ino(bucket);
-
- sun4v_intr_settarget(ino, goal_cpu);
- sun4v_intr_setenabled(ino, HV_INTR_ENABLED);
- } else {
- unsigned long imap = bucket->imap;
- unsigned int tid = sun4u_compute_tid(imap, goal_cpu);
-
- upa_writel(tid | IMAP_VALID, imap);
- }
-
- do {
- if (++goal_cpu >= NR_CPUS)
- goal_cpu = 0;
- } while (!cpu_online(goal_cpu));
-
- return goal_cpu;
-}
-
-/* Called from request_irq. */
-static void distribute_irqs(void)
-{
- unsigned long flags;
- int cpu, level;
-
- spin_lock_irqsave(&irq_action_lock, flags);
- cpu = 0;
-
- for (level = 1; level < NR_IRQS; level++) {
- struct irqaction *p = irq_action[level];
-
- while(p) {
- cpu = retarget_one_irq(p, cpu);
- p = p->next;
- }
- }
- spin_unlock_irqrestore(&irq_action_lock, flags);
-}
-#endif
-
struct sun5_timer {
u64 count0;
u64 limit0;
}
}
+static struct irqaction timer_irq_action = {
+ .name = "timer",
+};
+
/* Only invoked on boot processor. */
void __init init_IRQ(void)
{
: /* No outputs */
: "i" (PSTATE_IE)
: "g1");
-}
-static struct proc_dir_entry *root_irq_dir;
-static struct proc_dir_entry *irq_dir[NR_IRQS];
-
-#ifdef CONFIG_SMP
-
-static int irq_affinity_read_proc(char *page, char **start, off_t off,
- int count, int *eof, void *data)
-{
- struct ino_bucket *bp = ivector_table + (long)data;
- struct irq_desc *desc = bp->irq_info;
- struct irqaction *ap = desc->action;
- cpumask_t mask;
- int len;
-
- mask = get_smpaff_in_irqaction(ap);
- if (cpus_empty(mask))
- mask = cpu_online_map;
-
- len = cpumask_scnprintf(page, count, mask);
- if (count - len < 2)
- return -EINVAL;
- len += sprintf(page + len, "\n");
- return len;
+ irq_desc[0].action = &timer_irq_action;
}
-
-static inline void set_intr_affinity(int virt_irq, cpumask_t hw_aff)
-{
- struct ino_bucket *bp;
- struct irq_desc *desc;
- struct irqaction *ap;
- unsigned int real_irq;
-
- real_irq = virt_to_real_irq(virt_irq);
- if (unlikely(!real_irq))
- return;
-
- bp = __bucket(real_irq);
- desc = bp->irq_info;
- ap = desc->action;
-
- /* Users specify affinity in terms of hw cpu ids.
- * As soon as we do this, handler_irq() might see and take action.
- */
- put_smpaff_in_irqaction(ap, hw_aff);
-
- /* Migration is simply done by the next cpu to service this
- * interrupt.
- *
- * XXX Broken, this doesn't happen anymore...
- */
-}
-
-static int irq_affinity_write_proc(struct file *file,
- const char __user *buffer,
- unsigned long count, void *data)
-{
- int virt_irq = (long) data, full_count = count, err;
- cpumask_t new_value;
-
- err = cpumask_parse(buffer, count, new_value);
-
- /*
- * Do not allow disabling IRQs completely - it's a too easy
- * way to make the system unusable accidentally :-) At least
- * one online CPU still has to be targeted.
- */
- cpus_and(new_value, new_value, cpu_online_map);
- if (cpus_empty(new_value))
- return -EINVAL;
-
- set_intr_affinity(virt_irq, new_value);
-
- return full_count;
-}
-
-#endif
-
-#define MAX_NAMELEN 10
-
-static void register_irq_proc(unsigned int virt_irq)
-{
- char name [MAX_NAMELEN];
-
- if (!root_irq_dir || irq_dir[virt_irq])
- return;
-
- memset(name, 0, MAX_NAMELEN);
- sprintf(name, "%d", virt_irq);
-
- /* create /proc/irq/1234 */
- irq_dir[virt_irq] = proc_mkdir(name, root_irq_dir);
-
-#ifdef CONFIG_SMP
- /* XXX SMP affinity not supported on starfire yet. */
- if (this_is_starfire == 0) {
- struct proc_dir_entry *entry;
-
- /* create /proc/irq/1234/smp_affinity */
- entry = create_proc_entry("smp_affinity", 0600, irq_dir[irq]);
-
- if (entry) {
- entry->nlink = 1;
- entry->data = (void *)(long)virt_irq;
- entry->read_proc = irq_affinity_read_proc;
- entry->write_proc = irq_affinity_write_proc;
- }
- }
-#endif
-}
-
-void init_irq_proc(void)
-{
- /* create /proc/irq */
- root_irq_dir = proc_mkdir("irq", NULL);
-}
-
projects / linux-2.6 / commitdiff