diff options
Diffstat (limited to 'arch/sparc64/kernel/irq.c')
| -rw-r--r-- | arch/sparc64/kernel/irq.c | 1009 |
1 files changed, 0 insertions, 1009 deletions
diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c deleted file mode 100644 index 233526ba3ab..00000000000 --- a/arch/sparc64/kernel/irq.c +++ /dev/null @@ -1,1009 +0,0 @@ -/* $Id: irq.c,v 1.114 2002/01/11 08:45:38 davem Exp $ - * irq.c: UltraSparc IRQ handling/init/registry. - * - * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu) - * Copyright (C) 1998 Eddie C. Dost (ecd@skynet.be) - * Copyright (C) 1998 Jakub Jelinek (jj@ultra.linux.cz) - */ - -#include <linux/config.h> -#include <linux/module.h> -#include <linux/sched.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 <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/sbus.h> -#include <asm/iommu.h> -#include <asm/upa.h> -#include <asm/oplib.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> - -#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 - * set the softint on this cpu. - * - * To make processing these packets efficient and race free we use - * an array of irq buckets below. The interrupt vector handler in - * entry.S feeds incoming packets into per-cpu pil-indexed lists. - * 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. - */ - -struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BYTES))); - -/* 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 - * is accessed from the vectored interrupt trap handler. If - * 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)]) - -static struct irqaction *irq_action[NR_IRQS+1]; - -/* 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 void register_irq_proc (unsigned int irq); - -/* - * Upper 2b of irqaction->flags holds the ino. - * irqaction->mask holds the smp affinity information. - */ -#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) -#define get_smpaff_in_irqaction(action) ((action)->mask) - -int show_interrupts(struct seq_file *p, void *v) -{ - 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); -#ifndef CONFIG_SMP - seq_printf(p, "%10u ", kstat_irqs(i)); -#else - for (j = 0; j < NR_CPUS; j++) { - if (!cpu_online(j)) - continue; - seq_printf(p, "%10u ", - kstat_cpu(j).irqs[i]); - } -#endif - seq_printf(p, " %s:%lx", action->name, - get_ino_in_irqaction(action)); - for (action = action->next; action; action = action->next) { - seq_printf(p, ", %s:%lx", action->name, - get_ino_in_irqaction(action)); - } - seq_putc(p, '\n'); - } -out_unlock: - spin_unlock_irqrestore(&irq_action_lock, flags); - - return 0; -} - -/* Now these are always passed a true fully specified sun4u INO. */ -void enable_irq(unsigned int irq) -{ - struct ino_bucket *bucket = __bucket(irq); - unsigned long imap; - unsigned long tid; - - imap = bucket->imap; - if (imap == 0UL) - return; - - preempt_disable(); - - if (tlb_type == cheetah || tlb_type == cheetah_plus) { - unsigned long ver; - - __asm__ ("rdpr %%ver, %0" : "=r" (ver)); - if ((ver >> 32) == 0x003e0016) { - /* We set it to our JBUS ID. */ - __asm__ __volatile__("ldxa [%%g0] %1, %0" - : "=r" (tid) - : "i" (ASI_JBUS_CONFIG)); - tid = ((tid & (0x1fUL<<17)) << 9); - tid &= IMAP_TID_JBUS; - } else { - /* We set it to our Safari AID. */ - __asm__ __volatile__("ldxa [%%g0] %1, %0" - : "=r" (tid) - : "i" (ASI_SAFARI_CONFIG)); - tid = ((tid & (0x3ffUL<<17)) << 9); - tid &= IMAP_AID_SAFARI; - } - } else if (this_is_starfire == 0) { - /* We set it to our UPA MID. */ - __asm__ __volatile__("ldxa [%%g0] %1, %0" - : "=r" (tid) - : "i" (ASI_UPA_CONFIG)); - tid = ((tid & UPA_CONFIG_MID) << 9); - tid &= IMAP_TID_UPA; - } else { - tid = (starfire_translate(imap, smp_processor_id()) << 26); - tid &= IMAP_TID_UPA; - } - - /* 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(); -} - -/* This now gets passed true ino's as well. */ -void disable_irq(unsigned int irq) -{ - struct ino_bucket *bucket = __bucket(irq); - unsigned long imap; - - imap = bucket->imap; - if (imap != 0UL) { - 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); - } -} - -/* 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) -{ - prom_printf("IRQ: INO %04x (%d:%016lx:%016lx) --> " - "(%d:%d:%016lx:%016lx), halting...\n", - ino, bucket->pil, bucket->iclr, bucket->imap, - pil, inofixup, iclr, imap); - prom_halt(); -} - -unsigned int build_irq(int pil, int inofixup, unsigned long iclr, unsigned long imap) -{ - 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); - } - - /* RULE: Both must be specified in all other cases. */ - if (iclr == 0UL || imap == 0UL) { - prom_printf("Invalid build_irq %d %d %016lx %016lx\n", - pil, inofixup, iclr, imap); - prom_halt(); - } - - ino = (upa_readl(imap) & (IMAP_IGN | IMAP_INO)) + inofixup; - if (ino > NUM_IVECS) { - prom_printf("Invalid INO %04x (%d:%d:%016lx:%016lx)\n", - ino, pil, inofixup, iclr, imap); - prom_halt(); - } - - bucket = &ivector_table[ino]; - if (bucket->flags & IBF_ACTIVE) - build_irq_error("IRQ: Trying to build active INO bucket.\n", - ino, pil, inofixup, iclr, imap, bucket); - - if (bucket->irq_info) { - if (bucket->imap != imap || bucket->iclr != iclr) - build_irq_error("IRQ: Trying to reinit INO bucket.\n", - ino, pil, inofixup, iclr, imap, bucket); - - goto out; - } - - bucket->irq_info = kmalloc(sizeof(struct irq_desc), GFP_ATOMIC); - if (!bucket->irq_info) { - prom_printf("IRQ: Error, kmalloc(irq_desc) failed.\n"); - prom_halt(); - } - memset(bucket->irq_info, 0, sizeof(struct irq_desc)); - - /* Ok, looks good, set it up. Don't touch the irq_chain or - * the pending flag. - */ - bucket->imap = imap; - bucket->iclr = iclr; - bucket->pil = pil; - bucket->flags = 0; - -out: - return __irq(bucket); -} - -static void atomic_bucket_insert(struct ino_bucket *bucket) -{ - unsigned long pstate; - unsigned int *ent; - - __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); - bucket->irq_chain = *ent; - *ent = __irq(bucket); - __asm__ __volatile__("wrpr %0, 0x0, %%pstate" : : "r" (pstate)); -} - -static int check_irq_sharing(int pil, unsigned long irqflags) -{ - struct irqaction *action, *tmp; - - action = *(irq_action + pil); - if (action) { - if ((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ)) { - for (tmp = action; tmp->next; tmp = tmp->next) - ; - } else { - return -EBUSY; - } - } - return 0; -} - -static void append_irq_action(int pil, struct irqaction *action) -{ - struct irqaction **pp = irq_action + pil; - - while (*pp) - pp = &((*pp)->next); - *pp = action; -} - -static struct irqaction *get_action_slot(struct ino_bucket *bucket) -{ - struct irq_desc *desc = bucket->irq_info; - int max_irq, i; - - 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 (desc->action_active_mask & mask) - continue; - - desc->action_active_mask |= mask; - return p; - } - return NULL; -} - -int request_irq(unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *), - unsigned long irqflags, const char *name, void *dev_id) -{ - struct irqaction *action; - struct ino_bucket *bucket = __bucket(irq); - unsigned long flags; - int pending = 0; - - if (unlikely(!handler)) - return -EINVAL; - - if (unlikely(!bucket->irq_info)) - return -ENODEV; - - if ((bucket != &pil0_dummy_bucket) && (irqflags & SA_SAMPLE_RANDOM)) { - /* - * This function might sleep, we want to call it first, - * outside of the atomic block. In SA_STATIC_ALLOC case, - * random driver's kmalloc will fail, but it is safe. - * If already initialized, random driver will not reinit. - * 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(irq); - } - - spin_lock_irqsave(&irq_action_lock, flags); - - if (check_irq_sharing(bucket->pil, irqflags)) { - spin_unlock_irqrestore(&irq_action_lock, flags); - return -EBUSY; - } - - action = get_action_slot(bucket); - if (!action) { - spin_unlock_irqrestore(&irq_action_lock, flags); - return -ENOMEM; - } - - 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; - action->name = name; - action->next = NULL; - action->dev_id = dev_id; - put_ino_in_irqaction(action, irq); - put_smpaff_in_irqaction(action, CPU_MASK_NONE); - - append_irq_action(bucket->pil, action); - - enable_irq(irq); - - /* We ate the IVEC already, this makes sure it does not get lost. */ - if (pending) { - atomic_bucket_insert(bucket); - set_softint(1 << bucket->pil); - } - - spin_unlock_irqrestore(&irq_action_lock, flags); - - if (bucket != &pil0_dummy_bucket) - register_irq_proc(__irq_ino(irq)); - -#ifdef CONFIG_SMP - distribute_irqs(); -#endif - return 0; -} - -EXPORT_SYMBOL(request_irq); - -static struct irqaction *unlink_irq_action(unsigned int irq, void *dev_id) -{ - struct ino_bucket *bucket = __bucket(irq); - struct irqaction *action, **pp; - - pp = irq_action + bucket->pil; - action = *pp; - if (unlikely(!action)) - return NULL; - - if (unlikely(!action->handler)) { - printk("Freeing free IRQ %d\n", bucket->pil); - return NULL; - } - - 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 irq, void *dev_id) -{ - struct irqaction *action; - struct ino_bucket *bucket; - unsigned long flags; - - spin_lock_irqsave(&irq_action_lock, flags); - - action = unlink_irq_action(irq, dev_id); - - spin_unlock_irqrestore(&irq_action_lock, flags); - - if (unlikely(!action)) - return; - - synchronize_irq(irq); - - spin_lock_irqsave(&irq_action_lock, flags); - - bucket = __bucket(irq); - if (bucket != &pil0_dummy_bucket) { - struct irq_desc *desc = bucket->irq_info; - unsigned long imap = bucket->imap; - int ent, i; - - for (i = 0; i < MAX_IRQ_DESC_ACTION; i++) { - struct irqaction *p = &desc->action[i]; - - if (p == action) { - desc->action_active_mask &= ~(1 << i); - break; - } - } - - if (!desc->action_active_mask) { - /* 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; - } - - /* Only disable when no other sub-irq levels of - * the same IMAP are active. - */ - if (ent == NUM_IVECS) - disable_irq(irq); - } - } - - spin_unlock_irqrestore(&irq_action_lock, flags); -} - -EXPORT_SYMBOL(free_irq); - -#ifdef CONFIG_SMP -void synchronize_irq(unsigned int irq) -{ - struct ino_bucket *bucket = __bucket(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; - } -#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(int irq, 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; - 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); - - if (!(action_mask & mask)) - continue; - - action_mask &= ~mask; - - if (p->handler(__irq(bp), p->dev_id, regs) == IRQ_HANDLED) - random |= p->flags; - - if (!action_mask) - break; - } - if (bp->pil != 0) { - upa_writel(ICLR_IDLE, bp->iclr); - /* Test and add entropy */ - if (random & SA_SAMPLE_RANDOM) - add_interrupt_randomness(irq); - } -out: - bp->flags &= ~IBF_INPROGRESS; -} - -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. - */ - { - 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 - while (bp) { - struct ino_bucket *nbp = __bucket(bp->irq_chain); - - bp->irq_chain = 0; - process_bucket(irq, bp, regs); - bp = nbp; - } - irq_exit(); -} - -#ifdef CONFIG_BLK_DEV_FD -extern irqreturn_t floppy_interrupt(int, void *, struct pt_regs *);; - -/* XXX No easy way to include asm/floppy.h XXX */ -extern unsigned char *pdma_vaddr; -extern unsigned long pdma_size; -extern volatile int doing_pdma; -extern unsigned long fdc_status; - -irqreturn_t sparc_floppy_irq(int irq, void *dev_cookie, struct pt_regs *regs) -{ - if (likely(doing_pdma)) { - void __iomem *stat = (void __iomem *) fdc_status; - unsigned char *vaddr = pdma_vaddr; - unsigned long size = pdma_size; - u8 val; - - while (size) { - val = readb(stat); - if (unlikely(!(val & 0x80))) { - pdma_vaddr = vaddr; - pdma_size = size; - return IRQ_HANDLED; - } - if (unlikely(!(val & 0x20))) { - pdma_vaddr = vaddr; - pdma_size = size; - doing_pdma = 0; - goto main_interrupt; - } - if (val & 0x40) { - /* read */ - *vaddr++ = readb(stat + 1); - } else { - unsigned char data = *vaddr++; - - /* write */ - writeb(data, stat + 1); - } - size--; - } - - pdma_vaddr = vaddr; - pdma_size = size; - - /* Send Terminal Count pulse to floppy controller. */ - val = readb(auxio_register); - val |= AUXIO_AUX1_FTCNT; - writeb(val, auxio_register); - val &= AUXIO_AUX1_FTCNT; - writeb(val, auxio_register); - - doing_pdma = 0; - } - -main_interrupt: - return floppy_interrupt(irq, dev_cookie, regs); -} -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; - unsigned long imap = bucket->imap; - unsigned int tid; - - while (!cpu_online(goal_cpu)) { - if (++goal_cpu >= NR_CPUS) - goal_cpu = 0; - } - - if (tlb_type == cheetah || tlb_type == cheetah_plus) { - tid = goal_cpu << 26; - tid &= IMAP_AID_SAFARI; - } else if (this_is_starfire == 0) { - tid = goal_cpu << 26; - tid &= IMAP_TID_UPA; - } else { - tid = (starfire_translate(imap, goal_cpu) << 26); - tid &= IMAP_TID_UPA; - } - 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; - - /* - * Skip the timer at [0], and very rare error/power intrs at [15]. - * Also level [12], it causes problems on Ex000 systems. - */ - for (level = 1; level < NR_IRQS; level++) { - struct irqaction *p = irq_action[level]; - - if (level == 12) - continue; - - 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; - u64 count1; - u64 limit1; -}; - -static struct sun5_timer *prom_timers; -static u64 prom_limit0, prom_limit1; - -static void map_prom_timers(void) -{ - unsigned int addr[3]; - int tnode, err; - - /* PROM timer node hangs out in the top level of device siblings... */ - tnode = prom_finddevice("/counter-timer"); - - /* Assume if node is not present, PROM uses different tick mechanism - * which we should not care about. - */ - if (tnode == 0 || tnode == -1) { - prom_timers = (struct sun5_timer *) 0; - return; - } - - /* If PROM is really using this, it must be mapped by him. */ - err = prom_getproperty(tnode, "address", (char *)addr, sizeof(addr)); - if (err == -1) { - 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 init_irqwork_curcpu(void) -{ - register struct irq_work_struct *workp asm("o2"); - register unsigned long tmp asm("o3"); - int cpu = hard_smp_processor_id(); - - memset(__irq_work + cpu, 0, sizeof(*workp)); - - /* Make sure we are called with PSTATE_IE disabled. */ - __asm__ __volatile__("rdpr %%pstate, %0\n\t" - : "=r" (tmp)); - if (tmp & PSTATE_IE) { - prom_printf("BUG: init_irqwork_curcpu() called with " - "PSTATE_IE enabled, bailing.\n"); - __asm__ __volatile__("mov %%i7, %0\n\t" - : "=r" (tmp)); - prom_printf("BUG: Called from %lx\n", tmp); - prom_halt(); - } - - /* Set interrupt globals. */ - workp = &__irq_work[cpu]; - __asm__ __volatile__( - "rdpr %%pstate, %0\n\t" - "wrpr %0, %1, %%pstate\n\t" - "mov %2, %%g6\n\t" - "wrpr %0, 0x0, %%pstate\n\t" - : "=&r" (tmp) - : "i" (PSTATE_IG), "r" (workp)); -} - -/* Only invoked on boot processor. */ -void __init init_IRQ(void) -{ - map_prom_timers(); - kill_prom_timer(); - memset(&ivector_table[0], 0, sizeof(ivector_table)); - - /* 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"); -} - -static struct proc_dir_entry * root_irq_dir; -static struct proc_dir_entry * irq_dir [NUM_IVECS]; - -#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; -} - -static inline void set_intr_affinity(int irq, cpumask_t hw_aff) -{ - struct ino_bucket *bp = ivector_table + irq; - struct irq_desc *desc = bp->irq_info; - struct irqaction *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. - */ -} - -static int irq_affinity_write_proc (struct file *file, const char __user *buffer, - unsigned long count, void *data) -{ - int 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(irq, new_value); - - return full_count; -} - -#endif - -#define MAX_NAMELEN 10 - -static void register_irq_proc (unsigned int irq) -{ - char name [MAX_NAMELEN]; - - if (!root_irq_dir || irq_dir[irq]) - return; - - memset(name, 0, MAX_NAMELEN); - sprintf(name, "%x", irq); - - /* create /proc/irq/1234 */ - irq_dir[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)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); -} - |