diff options
Diffstat (limited to 'arch/sparc/kernel/irq_64.c')
| -rw-r--r-- | arch/sparc/kernel/irq_64.c | 1101 |
1 files changed, 1101 insertions, 0 deletions
diff --git a/arch/sparc/kernel/irq_64.c b/arch/sparc/kernel/irq_64.c new file mode 100644 index 0000000..a3ea2bc --- /dev/null +++ b/arch/sparc/kernel/irq_64.c @@ -0,0 +1,1101 @@ +/* irq.c: UltraSparc IRQ handling/init/registry. + * + * Copyright (C) 1997, 2007, 2008 David S. Miller (davem@davemloft.net) + * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) + * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz) + */ + +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/linkage.h> +#include <linux/ptrace.h> +#include <linux/errno.h> +#include <linux/kernel_stat.h> +#include <linux/signal.h> +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/random.h> +#include <linux/init.h> +#include <linux/delay.h> +#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/atomic.h> +#include <asm/system.h> +#include <asm/irq.h> +#include <asm/io.h> +#include <asm/iommu.h> +#include <asm/upa.h> +#include <asm/oplib.h> +#include <asm/prom.h> +#include <asm/timer.h> +#include <asm/smp.h> +#include <asm/starfire.h> +#include <asm/uaccess.h> +#include <asm/cache.h> +#include <asm/cpudata.h> +#include <asm/auxio.h> +#include <asm/head.h> +#include <asm/hypervisor.h> +#include <asm/cacheflush.h> + +#include "entry.h" + +#define NUM_IVECS (IMAP_INR + 1) + +struct ino_bucket *ivector_table; +unsigned long ivector_table_pa; + +/* On several sun4u processors, it is illegal to mix bypass and + * non-bypass accesses. Therefore we access all INO buckets + * using bypass accesses only. + */ +static unsigned long bucket_get_chain_pa(unsigned long bucket_pa) +{ + unsigned long ret; + + __asm__ __volatile__("ldxa [%1] %2, %0" + : "=&r" (ret) + : "r" (bucket_pa + + offsetof(struct ino_bucket, + __irq_chain_pa)), + "i" (ASI_PHYS_USE_EC)); + + return ret; +} + +static void bucket_clear_chain_pa(unsigned long bucket_pa) +{ + __asm__ __volatile__("stxa %%g0, [%0] %1" + : /* no outputs */ + : "r" (bucket_pa + + offsetof(struct ino_bucket, + __irq_chain_pa)), + "i" (ASI_PHYS_USE_EC)); +} + +static unsigned int bucket_get_virt_irq(unsigned long bucket_pa) +{ + unsigned int ret; + + __asm__ __volatile__("lduwa [%1] %2, %0" + : "=&r" (ret) + : "r" (bucket_pa + + offsetof(struct ino_bucket, + __virt_irq)), + "i" (ASI_PHYS_USE_EC)); + + return ret; +} + +static void bucket_set_virt_irq(unsigned long bucket_pa, + unsigned int virt_irq) +{ + __asm__ __volatile__("stwa %0, [%1] %2" + : /* no outputs */ + : "r" (virt_irq), + "r" (bucket_pa + + offsetof(struct ino_bucket, + __virt_irq)), + "i" (ASI_PHYS_USE_EC)); +} + +#define irq_work_pa(__cpu) &(trap_block[(__cpu)].irq_worklist_pa) + +static struct { + unsigned int dev_handle; + unsigned int dev_ino; + unsigned int in_use; +} virt_irq_table[NR_IRQS]; +static DEFINE_SPINLOCK(virt_irq_alloc_lock); + +unsigned char virt_irq_alloc(unsigned int dev_handle, + unsigned int dev_ino) +{ + unsigned long flags; + unsigned char ent; + + BUILD_BUG_ON(NR_IRQS >= 256); + + spin_lock_irqsave(&virt_irq_alloc_lock, flags); + + for (ent = 1; ent < NR_IRQS; ent++) { + if (!virt_irq_table[ent].in_use) + break; + } + if (ent >= NR_IRQS) { + printk(KERN_ERR "IRQ: Out of virtual IRQs.\n"); + ent = 0; + } else { + virt_irq_table[ent].dev_handle = dev_handle; + virt_irq_table[ent].dev_ino = dev_ino; + virt_irq_table[ent].in_use = 1; + } + + spin_unlock_irqrestore(&virt_irq_alloc_lock, flags); + + return ent; +} + +#ifdef CONFIG_PCI_MSI +void virt_irq_free(unsigned int virt_irq) +{ + unsigned long flags; + + if (virt_irq >= NR_IRQS) + return; + + spin_lock_irqsave(&virt_irq_alloc_lock, flags); + + virt_irq_table[virt_irq].in_use = 0; + + spin_unlock_irqrestore(&virt_irq_alloc_lock, flags); +} +#endif + +/* + * /proc/interrupts printing: + */ + +int show_interrupts(struct seq_file *p, void *v) +{ + int i = *(loff_t *) v, j; + struct irqaction * action; + unsigned long flags; + + 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]); +#endif + seq_printf(p, " %9s", irq_desc[i].chip->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); + } + return 0; +} + +static unsigned int sun4u_compute_tid(unsigned long imap, unsigned long cpuid) +{ + unsigned int tid; + + if (this_is_starfire) { + tid = starfire_translate(imap, cpuid); + tid <<= IMAP_TID_SHIFT; + tid &= IMAP_TID_UPA; + } else { + if (tlb_type == cheetah || tlb_type == cheetah_plus) { + unsigned long ver; + + __asm__ ("rdpr %%ver, %0" : "=r" (ver)); + if ((ver >> 32UL) == __JALAPENO_ID || + (ver >> 32UL) == __SERRANO_ID) { + tid = cpuid << IMAP_TID_SHIFT; + tid &= IMAP_TID_JBUS; + } else { + unsigned int a = cpuid & 0x1f; + unsigned int n = (cpuid >> 5) & 0x1f; + + tid = ((a << IMAP_AID_SHIFT) | + (n << IMAP_NID_SHIFT)); + tid &= (IMAP_AID_SAFARI | + IMAP_NID_SAFARI);; + } + } else { + tid = cpuid << IMAP_TID_SHIFT; + tid &= IMAP_TID_UPA; + } + } + + return tid; +} + +struct irq_handler_data { + unsigned long iclr; + unsigned long imap; + + void (*pre_handler)(unsigned int, void *, void *); + void *arg1; + void *arg2; +}; + +#ifdef CONFIG_SMP +static int irq_choose_cpu(unsigned int virt_irq) +{ + cpumask_t mask = irq_desc[virt_irq].affinity; + int cpuid; + + if (cpus_equal(mask, CPU_MASK_ALL)) { + static int irq_rover; + static DEFINE_SPINLOCK(irq_rover_lock); + unsigned long flags; + + /* Round-robin distribution... */ + do_round_robin: + spin_lock_irqsave(&irq_rover_lock, flags); + + 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)); + + spin_unlock_irqrestore(&irq_rover_lock, flags); + } else { + cpumask_t tmp; + + cpus_and(tmp, cpu_online_map, mask); + + if (cpus_empty(tmp)) + goto do_round_robin; + + cpuid = first_cpu(tmp); + } + + return cpuid; +} +#else +static int irq_choose_cpu(unsigned int virt_irq) +{ + return real_hard_smp_processor_id(); +} +#endif + +static void sun4u_irq_enable(unsigned int virt_irq) +{ + struct irq_handler_data *data = get_irq_chip_data(virt_irq); + + if (likely(data)) { + unsigned long cpuid, imap, val; + unsigned int tid; + + cpuid = irq_choose_cpu(virt_irq); + imap = data->imap; + + tid = sun4u_compute_tid(imap, cpuid); + + val = upa_readq(imap); + val &= ~(IMAP_TID_UPA | IMAP_TID_JBUS | + IMAP_AID_SAFARI | IMAP_NID_SAFARI); + val |= tid | IMAP_VALID; + upa_writeq(val, imap); + upa_writeq(ICLR_IDLE, data->iclr); + } +} + +static void sun4u_set_affinity(unsigned int virt_irq, cpumask_t mask) +{ + sun4u_irq_enable(virt_irq); +} + +static void sun4u_irq_disable(unsigned int virt_irq) +{ + struct irq_handler_data *data = get_irq_chip_data(virt_irq); + + if (likely(data)) { + unsigned long imap = data->imap; + unsigned long tmp = upa_readq(imap); + + tmp &= ~IMAP_VALID; + upa_writeq(tmp, imap); + } +} + +static void sun4u_irq_eoi(unsigned int virt_irq) +{ + struct irq_handler_data *data = get_irq_chip_data(virt_irq); + struct irq_desc *desc = irq_desc + virt_irq; + + if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS))) + return; + + if (likely(data)) + upa_writeq(ICLR_IDLE, data->iclr); +} + +static void sun4v_irq_enable(unsigned int virt_irq) +{ + unsigned int ino = virt_irq_table[virt_irq].dev_ino; + unsigned long cpuid = irq_choose_cpu(virt_irq); + int err; + + err = sun4v_intr_settarget(ino, cpuid); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): " + "err(%d)\n", ino, cpuid, err); + err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_setstate(%x): " + "err(%d)\n", ino, err); + err = sun4v_intr_setenabled(ino, HV_INTR_ENABLED); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_setenabled(%x): err(%d)\n", + ino, err); +} + +static void sun4v_set_affinity(unsigned int virt_irq, cpumask_t mask) +{ + unsigned int ino = virt_irq_table[virt_irq].dev_ino; + unsigned long cpuid = irq_choose_cpu(virt_irq); + int err; + + err = sun4v_intr_settarget(ino, cpuid); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_settarget(%x,%lu): " + "err(%d)\n", ino, cpuid, err); +} + +static void sun4v_irq_disable(unsigned int virt_irq) +{ + unsigned int ino = virt_irq_table[virt_irq].dev_ino; + int err; + + err = sun4v_intr_setenabled(ino, HV_INTR_DISABLED); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_setenabled(%x): " + "err(%d)\n", ino, err); +} + +static void sun4v_irq_eoi(unsigned int virt_irq) +{ + unsigned int ino = virt_irq_table[virt_irq].dev_ino; + struct irq_desc *desc = irq_desc + virt_irq; + int err; + + if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS))) + return; + + err = sun4v_intr_setstate(ino, HV_INTR_STATE_IDLE); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_intr_setstate(%x): " + "err(%d)\n", ino, err); +} + +static void sun4v_virq_enable(unsigned int virt_irq) +{ + unsigned long cpuid, dev_handle, dev_ino; + int err; + + cpuid = irq_choose_cpu(virt_irq); + + dev_handle = virt_irq_table[virt_irq].dev_handle; + dev_ino = virt_irq_table[virt_irq].dev_ino; + + err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): " + "err(%d)\n", + dev_handle, dev_ino, cpuid, err); + err = sun4v_vintr_set_state(dev_handle, dev_ino, + HV_INTR_STATE_IDLE); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx," + "HV_INTR_STATE_IDLE): err(%d)\n", + dev_handle, dev_ino, err); + err = sun4v_vintr_set_valid(dev_handle, dev_ino, + HV_INTR_ENABLED); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx," + "HV_INTR_ENABLED): err(%d)\n", + dev_handle, dev_ino, err); +} + +static void sun4v_virt_set_affinity(unsigned int virt_irq, cpumask_t mask) +{ + unsigned long cpuid, dev_handle, dev_ino; + int err; + + cpuid = irq_choose_cpu(virt_irq); + + dev_handle = virt_irq_table[virt_irq].dev_handle; + dev_ino = virt_irq_table[virt_irq].dev_ino; + + err = sun4v_vintr_set_target(dev_handle, dev_ino, cpuid); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_target(%lx,%lx,%lu): " + "err(%d)\n", + dev_handle, dev_ino, cpuid, err); +} + +static void sun4v_virq_disable(unsigned int virt_irq) +{ + unsigned long dev_handle, dev_ino; + int err; + + dev_handle = virt_irq_table[virt_irq].dev_handle; + dev_ino = virt_irq_table[virt_irq].dev_ino; + + err = sun4v_vintr_set_valid(dev_handle, dev_ino, + HV_INTR_DISABLED); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx," + "HV_INTR_DISABLED): err(%d)\n", + dev_handle, dev_ino, err); +} + +static void sun4v_virq_eoi(unsigned int virt_irq) +{ + struct irq_desc *desc = irq_desc + virt_irq; + unsigned long dev_handle, dev_ino; + int err; + + if (unlikely(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS))) + return; + + dev_handle = virt_irq_table[virt_irq].dev_handle; + dev_ino = virt_irq_table[virt_irq].dev_ino; + + err = sun4v_vintr_set_state(dev_handle, dev_ino, + HV_INTR_STATE_IDLE); + if (err != HV_EOK) + printk(KERN_ERR "sun4v_vintr_set_state(%lx,%lx," + "HV_INTR_STATE_IDLE): err(%d)\n", + dev_handle, dev_ino, err); +} + +static struct irq_chip sun4u_irq = { + .typename = "sun4u", + .enable = sun4u_irq_enable, + .disable = sun4u_irq_disable, + .eoi = sun4u_irq_eoi, + .set_affinity = sun4u_set_affinity, +}; + +static struct irq_chip sun4v_irq = { + .typename = "sun4v", + .enable = sun4v_irq_enable, + .disable = sun4v_irq_disable, + .eoi = sun4v_irq_eoi, + .set_affinity = sun4v_set_affinity, +}; + +static struct irq_chip sun4v_virq = { + .typename = "vsun4v", + .enable = sun4v_virq_enable, + .disable = sun4v_virq_disable, + .eoi = sun4v_virq_eoi, + .set_affinity = sun4v_virt_set_affinity, +}; + +static void pre_flow_handler(unsigned int virt_irq, + struct irq_desc *desc) +{ + struct irq_handler_data *data = get_irq_chip_data(virt_irq); + unsigned int ino = virt_irq_table[virt_irq].dev_ino; + + data->pre_handler(ino, data->arg1, data->arg2); + + handle_fasteoi_irq(virt_irq, desc); +} + +void irq_install_pre_handler(int virt_irq, + void (*func)(unsigned int, void *, void *), + void *arg1, void *arg2) +{ + struct irq_handler_data *data = get_irq_chip_data(virt_irq); + struct irq_desc *desc = irq_desc + virt_irq; + + data->pre_handler = func; + data->arg1 = arg1; + data->arg2 = arg2; + + desc->handle_irq = pre_flow_handler; +} + +unsigned int build_irq(int inofixup, unsigned long iclr, unsigned long imap) +{ + struct ino_bucket *bucket; + struct irq_handler_data *data; + unsigned int virt_irq; + int ino; + + BUG_ON(tlb_type == hypervisor); + + ino = (upa_readq(imap) & (IMAP_IGN | IMAP_INO)) + inofixup; + bucket = &ivector_table[ino]; + virt_irq = bucket_get_virt_irq(__pa(bucket)); + if (!virt_irq) { + virt_irq = virt_irq_alloc(0, ino); + bucket_set_virt_irq(__pa(bucket), virt_irq); + set_irq_chip_and_handler_name(virt_irq, + &sun4u_irq, + handle_fasteoi_irq, + "IVEC"); + } + + data = get_irq_chip_data(virt_irq); + if (unlikely(data)) + goto out; + + data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC); + if (unlikely(!data)) { + prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n"); + prom_halt(); + } + set_irq_chip_data(virt_irq, data); + + data->imap = imap; + data->iclr = iclr; + +out: + return virt_irq; +} + +static unsigned int sun4v_build_common(unsigned long sysino, + struct irq_chip *chip) +{ + struct ino_bucket *bucket; + struct irq_handler_data *data; + unsigned int virt_irq; + + BUG_ON(tlb_type != hypervisor); + + bucket = &ivector_table[sysino]; + virt_irq = bucket_get_virt_irq(__pa(bucket)); + if (!virt_irq) { + virt_irq = virt_irq_alloc(0, sysino); + bucket_set_virt_irq(__pa(bucket), virt_irq); + set_irq_chip_and_handler_name(virt_irq, chip, + handle_fasteoi_irq, + "IVEC"); + } + + data = get_irq_chip_data(virt_irq); + if (unlikely(data)) + goto out; + + data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC); + if (unlikely(!data)) { + prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n"); + prom_halt(); + } + set_irq_chip_data(virt_irq, data); + + /* 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; + +out: + return virt_irq; +} + +unsigned int sun4v_build_irq(u32 devhandle, unsigned int devino) +{ + unsigned long sysino = sun4v_devino_to_sysino(devhandle, devino); + + return sun4v_build_common(sysino, &sun4v_irq); +} + +unsigned int sun4v_build_virq(u32 devhandle, unsigned int devino) +{ + struct irq_handler_data *data; + unsigned long hv_err, cookie; + struct ino_bucket *bucket; + struct irq_desc *desc; + unsigned int virt_irq; + + bucket = kzalloc(sizeof(struct ino_bucket), GFP_ATOMIC); + if (unlikely(!bucket)) + return 0; + __flush_dcache_range((unsigned long) bucket, + ((unsigned long) bucket + + sizeof(struct ino_bucket))); + + virt_irq = virt_irq_alloc(devhandle, devino); + bucket_set_virt_irq(__pa(bucket), virt_irq); + + set_irq_chip_and_handler_name(virt_irq, &sun4v_virq, + handle_fasteoi_irq, + "IVEC"); + + data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC); + if (unlikely(!data)) + return 0; + + /* In order to make the LDC channel startup sequence easier, + * especially wrt. locking, we do not let request_irq() enable + * the interrupt. + */ + desc = irq_desc + virt_irq; + desc->status |= IRQ_NOAUTOEN; + + set_irq_chip_data(virt_irq, data); + + /* 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; + + cookie = ~__pa(bucket); + hv_err = sun4v_vintr_set_cookie(devhandle, devino, cookie); + if (hv_err) { + prom_printf("IRQ: Fatal, cannot set cookie for [%x:%x] " + "err=%lu\n", devhandle, devino, hv_err); + prom_halt(); + } + + return virt_irq; +} + +void ack_bad_irq(unsigned int virt_irq) +{ + unsigned int ino = virt_irq_table[virt_irq].dev_ino; + + if (!ino) + ino = 0xdeadbeef; + + printk(KERN_CRIT "Unexpected IRQ from ino[%x] virt_irq[%u]\n", + ino, virt_irq); +} + +void *hardirq_stack[NR_CPUS]; +void *softirq_stack[NR_CPUS]; + +static __attribute__((always_inline)) void *set_hardirq_stack(void) +{ + void *orig_sp, *sp = hardirq_stack[smp_processor_id()]; + + __asm__ __volatile__("mov %%sp, %0" : "=r" (orig_sp)); + if (orig_sp < sp || + orig_sp > (sp + THREAD_SIZE)) { + sp += THREAD_SIZE - 192 - STACK_BIAS; + __asm__ __volatile__("mov %0, %%sp" : : "r" (sp)); + } + + return orig_sp; +} +static __attribute__((always_inline)) void restore_hardirq_stack(void *orig_sp) +{ + __asm__ __volatile__("mov %0, %%sp" : : "r" (orig_sp)); +} + +void handler_irq(int irq, struct pt_regs *regs) +{ + unsigned long pstate, bucket_pa; + struct pt_regs *old_regs; + void *orig_sp; + + clear_softint(1 << irq); + + old_regs = set_irq_regs(regs); + irq_enter(); + + /* Grab an atomic snapshot of the pending IVECs. */ + __asm__ __volatile__("rdpr %%pstate, %0\n\t" + "wrpr %0, %3, %%pstate\n\t" + "ldx [%2], %1\n\t" + "stx %%g0, [%2]\n\t" + "wrpr %0, 0x0, %%pstate\n\t" + : "=&r" (pstate), "=&r" (bucket_pa) + : "r" (irq_work_pa(smp_processor_id())), + "i" (PSTATE_IE) + : "memory"); + + orig_sp = set_hardirq_stack(); + + while (bucket_pa) { + struct irq_desc *desc; + unsigned long next_pa; + unsigned int virt_irq; + + next_pa = bucket_get_chain_pa(bucket_pa); + virt_irq = bucket_get_virt_irq(bucket_pa); + bucket_clear_chain_pa(bucket_pa); + + desc = irq_desc + virt_irq; + + desc->handle_irq(virt_irq, desc); + + bucket_pa = next_pa; + } + + restore_hardirq_stack(orig_sp); + + irq_exit(); + set_irq_regs(old_regs); +} + +void do_softirq(void) +{ + unsigned long flags; + + if (in_interrupt()) + return; + + local_irq_save(flags); + + if (local_softirq_pending()) { + void *orig_sp, *sp = softirq_stack[smp_processor_id()]; + + sp += THREAD_SIZE - 192 - STACK_BIAS; + + __asm__ __volatile__("mov %%sp, %0\n\t" + "mov %1, %%sp" + : "=&r" (orig_sp) + : "r" (sp)); + __do_softirq(); + __asm__ __volatile__("mov %0, %%sp" + : : "r" (orig_sp)); + } + + local_irq_restore(flags); +} + +static void unhandled_perf_irq(struct pt_regs *regs) +{ + unsigned long pcr, pic; + + read_pcr(pcr); + read_pic(pic); + + write_pcr(0); + + printk(KERN_EMERG "CPU %d: Got unexpected perf counter IRQ.\n", + smp_processor_id()); + printk(KERN_EMERG "CPU %d: PCR[%016lx] PIC[%016lx]\n", + smp_processor_id(), pcr, pic); +} + +/* Almost a direct copy of the powerpc PMC code. */ +static DEFINE_SPINLOCK(perf_irq_lock); +static void *perf_irq_owner_caller; /* mostly for debugging */ +static void (*perf_irq)(struct pt_regs *regs) = unhandled_perf_irq; + +/* Invoked from level 15 PIL handler in trap table. */ +void perfctr_irq(int irq, struct pt_regs *regs) +{ + clear_softint(1 << irq); + perf_irq(regs); +} + +int register_perfctr_intr(void (*handler)(struct pt_regs *)) +{ + int ret; + + if (!handler) + return -EINVAL; + + spin_lock(&perf_irq_lock); + if (perf_irq != unhandled_perf_irq) { + printk(KERN_WARNING "register_perfctr_intr: " + "perf IRQ busy (reserved by caller %p)\n", + perf_irq_owner_caller); + ret = -EBUSY; + goto out; + } + + perf_irq_owner_caller = __builtin_return_address(0); + perf_irq = handler; + + ret = 0; +out: + spin_unlock(&perf_irq_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(register_perfctr_intr); + +void release_perfctr_intr(void (*handler)(struct pt_regs *)) +{ + spin_lock(&perf_irq_lock); + perf_irq_owner_caller = NULL; + perf_irq = unhandled_perf_irq; + spin_unlock(&perf_irq_lock); +} +EXPORT_SYMBOL_GPL(release_perfctr_intr); + +#ifdef CONFIG_HOTPLUG_CPU +void fixup_irqs(void) +{ + unsigned int irq; + + for (irq = 0; irq < NR_IRQS; irq++) { + unsigned long flags; + + spin_lock_irqsave(&irq_desc[irq].lock, flags); + if (irq_desc[irq].action && + !(irq_desc[irq].status & IRQ_PER_CPU)) { + if (irq_desc[irq].chip->set_affinity) + irq_desc[irq].chip->set_affinity(irq, + irq_desc[irq].affinity); + } + spin_unlock_irqrestore(&irq_desc[irq].lock, flags); + } + + tick_ops->disable_irq(); +} +#endif + +struct sun5_timer { + u64 count0; + u64 limit0; + u64 count1; + u64 limit1; +}; + +static struct sun5_timer *prom_timers; +static u64 prom_limit0, prom_limit1; + +static void map_prom_timers(void) +{ + struct device_node *dp; + const unsigned int *addr; + + /* PROM timer node hangs out in the top level of device siblings... */ + dp = of_find_node_by_path("/"); + dp = dp->child; + while (dp) { + if (!strcmp(dp->name, "counter-timer")) + break; + dp = dp->sibling; + } + + /* Assume if node is not present, PROM uses different tick mechanism + * which we should not care about. + */ + if (!dp) { + prom_timers = (struct sun5_timer *) 0; + return; + } + + /* If PROM is really using this, it must be mapped by him. */ + addr = of_get_property(dp, "address", NULL); + if (!addr) { + prom_printf("PROM does not have timer mapped, trying to continue.\n"); + prom_timers = (struct sun5_timer *) 0; + return; + } + prom_timers = (struct sun5_timer *) ((unsigned long)addr[0]); +} + +static void kill_prom_timer(void) +{ + if (!prom_timers) + return; + + /* Save them away for later. */ + prom_limit0 = prom_timers->limit0; + prom_limit1 = prom_timers->limit1; + + /* Just as in sun4c/sun4m PROM uses timer which ticks at IRQ 14. + * We turn both off here just to be paranoid. + */ + prom_timers->limit0 = 0; + prom_timers->limit1 = 0; + + /* Wheee, eat the interrupt packet too... */ + __asm__ __volatile__( +" mov 0x40, %%g2\n" +" ldxa [%%g0] %0, %%g1\n" +" ldxa [%%g2] %1, %%g1\n" +" stxa %%g0, [%%g0] %0\n" +" membar #Sync\n" + : /* no outputs */ + : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R) + : "g1", "g2"); +} + +void notrace init_irqwork_curcpu(void) +{ + int cpu = hard_smp_processor_id(); + + trap_block[cpu].irq_worklist_pa = 0UL; +} + +/* Please be very careful with register_one_mondo() and + * sun4v_register_mondo_queues(). + * + * On SMP this gets invoked from the CPU trampoline before + * the cpu has fully taken over the trap table from OBP, + * and it's kernel stack + %g6 thread register state is + * not fully cooked yet. + * + * Therefore you cannot make any OBP calls, not even prom_printf, + * from these two routines. + */ +static void __cpuinit register_one_mondo(unsigned long paddr, unsigned long type, unsigned long qmask) +{ + unsigned long num_entries = (qmask + 1) / 64; + unsigned long status; + + status = sun4v_cpu_qconf(type, paddr, num_entries); + if (status != HV_EOK) { + prom_printf("SUN4V: sun4v_cpu_qconf(%lu:%lx:%lu) failed, " + "err %lu\n", type, paddr, num_entries, status); + prom_halt(); + } +} + +void __cpuinit notrace sun4v_register_mondo_queues(int this_cpu) +{ + struct trap_per_cpu *tb = &trap_block[this_cpu]; + + register_one_mondo(tb->cpu_mondo_pa, HV_CPU_QUEUE_CPU_MONDO, + tb->cpu_mondo_qmask); + register_one_mondo(tb->dev_mondo_pa, HV_CPU_QUEUE_DEVICE_MONDO, + tb->dev_mondo_qmask); + register_one_mondo(tb->resum_mondo_pa, HV_CPU_QUEUE_RES_ERROR, + tb->resum_qmask); + register_one_mondo(tb->nonresum_mondo_pa, HV_CPU_QUEUE_NONRES_ERROR, + tb->nonresum_qmask); +} + +static void __init alloc_one_mondo(unsigned long *pa_ptr, unsigned long qmask) +{ + unsigned long size = PAGE_ALIGN(qmask + 1); + void *p = __alloc_bootmem(size, size, 0); + if (!p) { + prom_printf("SUN4V: Error, cannot allocate mondo queue.\n"); + prom_halt(); + } + + *pa_ptr = __pa(p); +} + +static void __init alloc_one_kbuf(unsigned long *pa_ptr, unsigned long qmask) +{ + unsigned long size = PAGE_ALIGN(qmask + 1); + void *p = __alloc_bootmem(size, size, 0); + + if (!p) { + prom_printf("SUN4V: Error, cannot allocate kbuf page.\n"); + prom_halt(); + } + + *pa_ptr = __pa(p); +} + +static void __init init_cpu_send_mondo_info(struct trap_per_cpu *tb) +{ +#ifdef CONFIG_SMP + void *page; + + BUILD_BUG_ON((NR_CPUS * sizeof(u16)) > (PAGE_SIZE - 64)); + + page = alloc_bootmem_pages(PAGE_SIZE); + if (!page) { + prom_printf("SUN4V: Error, cannot allocate cpu mondo page.\n"); + prom_halt(); + } + + tb->cpu_mondo_block_pa = __pa(page); + tb->cpu_list_pa = __pa(page + 64); +#endif +} + +/* Allocate mondo and error queues for all possible cpus. */ +static void __init sun4v_init_mondo_queues(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + struct trap_per_cpu *tb = &trap_block[cpu]; + + alloc_one_mondo(&tb->cpu_mondo_pa, tb->cpu_mondo_qmask); + alloc_one_mondo(&tb->dev_mondo_pa, tb->dev_mondo_qmask); + alloc_one_mondo(&tb->resum_mondo_pa, tb->resum_qmask); + alloc_one_kbuf(&tb->resum_kernel_buf_pa, tb->resum_qmask); + alloc_one_mondo(&tb->nonresum_mondo_pa, tb->nonresum_qmask); + alloc_one_kbuf(&tb->nonresum_kernel_buf_pa, + tb->nonresum_qmask); + } +} + +static void __init init_send_mondo_info(void) +{ + int cpu; + + for_each_possible_cpu(cpu) { + struct trap_per_cpu *tb = &trap_block[cpu]; + + init_cpu_send_mondo_info(tb); + } +} + +static struct irqaction timer_irq_action = { + .name = "timer", +}; + +/* Only invoked on boot processor. */ +void __init init_IRQ(void) +{ + unsigned long size; + + map_prom_timers(); + kill_prom_timer(); + + size = sizeof(struct ino_bucket) * NUM_IVECS; + ivector_table = alloc_bootmem(size); + if (!ivector_table) { + prom_printf("Fatal error, cannot allocate ivector_table\n"); + prom_halt(); + } + __flush_dcache_range((unsigned long) ivector_table, + ((unsigned long) ivector_table) + size); + + ivector_table_pa = __pa(ivector_table); + + if (tlb_type == hypervisor) + sun4v_init_mondo_queues(); + + init_send_mondo_info(); + + if (tlb_type == hypervisor) { + /* Load up the boot cpu's entries. */ + sun4v_register_mondo_queues(hard_smp_processor_id()); + } + + /* We need to clear any IRQ's pending in the soft interrupt + * registers, a spurious one could be left around from the + * PROM timer which we just disabled. + */ + clear_softint(get_softint()); + + /* Now that ivector table is initialized, it is safe + * to receive IRQ vector traps. We will normally take + * one or two right now, in case some device PROM used + * to boot us wants to speak to us. We just ignore them. + */ + __asm__ __volatile__("rdpr %%pstate, %%g1\n\t" + "or %%g1, %0, %%g1\n\t" + "wrpr %%g1, 0x0, %%pstate" + : /* No outputs */ + : "i" (PSTATE_IE) + : "g1"); + + irq_desc[0].action = &timer_irq_action; +} |