diff options
Diffstat (limited to 'arch/sparc64/kernel/irq.c')
| -rw-r--r-- | arch/sparc64/kernel/irq.c | 957 |
1 files changed, 284 insertions, 673 deletions
diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c index 49ad9cd0f8c8..a8c9dc8d1958 100644 --- a/arch/sparc64/kernel/irq.c +++ b/arch/sparc64/kernel/irq.c @@ -22,6 +22,7 @@ #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> @@ -42,10 +43,6 @@ #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 @@ -57,10 +54,29 @@ static void distribute_irqs(void); * 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 @@ -70,18 +86,6 @@ struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BY */ #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; @@ -117,69 +121,45 @@ static unsigned int virt_to_real_irq(unsigned char virt_irq) 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; } @@ -220,509 +200,321 @@ static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid) 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 @@ -740,35 +532,33 @@ void timer_irq(int irq, struct pt_regs *regs) 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(); } @@ -833,74 +623,6 @@ main_interrupt: 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; @@ -1076,6 +798,10 @@ void __cpuinit sun4v_init_mondo_queues(int use_bootmem, int cpu, int alloc, int } } +static struct irqaction timer_irq_action = { + .name = "timer", +}; + /* Only invoked on boot processor. */ void __init init_IRQ(void) { @@ -1103,121 +829,6 @@ 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); -} - |