irq.c
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上传日期:2013-04-10
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- /* $Id: irq.c,v 1.112 2001/11/16 00:04:54 kanoj 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/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/kbd_ll.h>
- #include <asm/ptrace.h>
- #include <asm/processor.h>
- #include <asm/atomic.h>
- #include <asm/system.h>
- #include <asm/irq.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/hardirq.h>
- #include <asm/softirq.h>
- #include <asm/starfire.h>
- #include <asm/uaccess.h>
- #include <asm/cache.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)));
- #ifndef CONFIG_SMP
- unsigned int __up_workvec[16] __attribute__ ((aligned (SMP_CACHE_BYTES)));
- #define irq_work(__cpu, __pil) &(__up_workvec[(void)(__cpu), (__pil)])
- #else
- #define irq_work(__cpu, __pil) &(cpu_data[(__cpu)].irq_worklists[(__pil)])
- #endif
- #ifdef CONFIG_PCI
- /* This is a table of physical addresses used to deal with IBF_DMA_SYNC.
- * It is used for PCI only to synchronize DMA transfers with IRQ delivery
- * for devices behind busses other than APB on Sabre systems.
- *
- * Currently these physical addresses are just config space accesses
- * to the command register for that device.
- */
- unsigned long pci_dma_wsync;
- unsigned long dma_sync_reg_table[256];
- unsigned char dma_sync_reg_table_entry = 0;
- #endif
- /* This is based upon code in the 32-bit Sparc kernel written mostly by
- * David Redman (djhr@tadpole.co.uk).
- */
- #define MAX_STATIC_ALLOC 4
- static struct irqaction static_irqaction[MAX_STATIC_ALLOC];
- static int static_irq_count;
- /* This is exported so that fast IRQ handlers can get at it... -DaveM */
- struct irqaction *irq_action[NR_IRQS+1] = {
- NULL, NULL, NULL, NULL, NULL, NULL , NULL, NULL,
- NULL, NULL, NULL, NULL, NULL, NULL , NULL, NULL
- };
- 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 get_irq_list(char *buf)
- {
- int i, len = 0;
- struct irqaction *action;
- #ifdef CONFIG_SMP
- int j;
- #endif
- for(i = 0; i < (NR_IRQS + 1); i++) {
- if(!(action = *(i + irq_action)))
- continue;
- len += sprintf(buf + len, "%3d: ", i);
- #ifndef CONFIG_SMP
- len += sprintf(buf + len, "%10u ", kstat_irqs(i));
- #else
- for (j = 0; j < smp_num_cpus; j++)
- len += sprintf(buf + len, "%10u ",
- kstat.irqs[cpu_logical_map(j)][i]);
- #endif
- len += sprintf(buf + len, " %s:%lx", action->name,
- get_ino_in_irqaction(action));
- for(action = action->next; action; action = action->next) {
- len += sprintf(buf+len, ", %s:%lx", action->name,
- get_ino_in_irqaction(action));
- }
- len += sprintf(buf + len, "n");
- }
- return len;
- }
- /* 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;
- if (tlb_type == cheetah || tlb_type == cheetah_plus) {
- /* 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, current->processor) << 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);
- }
- /* 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 ino_bucket pil0_dummy_bucket = {
- 0, /* irq_chain */
- 0, /* pil */
- 0, /* pending */
- 0, /* flags */
- 0, /* __unused */
- NULL, /* irq_info */
- 0UL, /* iclr */
- 0UL, /* imap */
- };
- 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 %016lxn",
- 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();
- }
- /* Ok, looks good, set it up. Don't touch the irq_chain or
- * the pending flag.
- */
- bucket = &ivector_table[ino];
- if ((bucket->flags & IBF_ACTIVE) ||
- (bucket->irq_info != NULL)) {
- /* This is a gross fatal error if it happens here. */
- prom_printf("IRQ: Trying to reinit INO bucket, fatal error.n");
- prom_printf("IRQ: Request INO %04x (%d:%d:%016lx:%016lx)n",
- ino, pil, inofixup, iclr, imap);
- prom_printf("IRQ: Existing (%d:%016lx:%016lx)n",
- bucket->pil, bucket->iclr, bucket->imap);
- prom_printf("IRQ: Cannot continue, halting...n");
- prom_halt();
- }
- bucket->imap = imap;
- bucket->iclr = iclr;
- bucket->pil = pil;
- bucket->flags = 0;
- bucket->irq_info = NULL;
- 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));
- }
- int request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *),
- unsigned long irqflags, const char *name, void *dev_id)
- {
- struct irqaction *action, *tmp = NULL;
- struct ino_bucket *bucket = __bucket(irq);
- unsigned long flags;
- int pending = 0;
- if ((bucket != &pil0_dummy_bucket) &&
- (bucket < &ivector_table[0] ||
- bucket >= &ivector_table[NUM_IVECS])) {
- unsigned int *caller;
- __asm__ __volatile__("mov %%i7, %0" : "=r" (caller));
- printk(KERN_CRIT "request_irq: Old style IRQ registry attempt "
- "from %p, irq %08x.n", caller, irq);
- return -EINVAL;
- }
- if(!handler)
- return -EINVAL;
- 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);
- }
- save_and_cli(flags);
- action = *(bucket->pil + irq_action);
- if(action) {
- if((action->flags & SA_SHIRQ) && (irqflags & SA_SHIRQ))
- for (tmp = action; tmp->next; tmp = tmp->next)
- ;
- else {
- restore_flags(flags);
- return -EBUSY;
- }
- action = NULL; /* Or else! */
- }
- /* If this is flagged as statically allocated then we use our
- * private struct which is never freed.
- */
- if(irqflags & SA_STATIC_ALLOC) {
- if(static_irq_count < MAX_STATIC_ALLOC)
- action = &static_irqaction[static_irq_count++];
- else
- printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed "
- "using kmallocn", irq, name);
- }
- if(action == NULL)
- action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
- GFP_KERNEL);
-
- if(!action) {
- restore_flags(flags);
- return -ENOMEM;
- }
- if (bucket == &pil0_dummy_bucket) {
- bucket->irq_info = action;
- bucket->flags |= IBF_ACTIVE;
- } else {
- if((bucket->flags & IBF_ACTIVE) != 0) {
- void *orig = bucket->irq_info;
- void **vector = NULL;
- if((bucket->flags & IBF_PCI) == 0) {
- printk("IRQ: Trying to share non-PCI bucket.n");
- goto free_and_ebusy;
- }
- if((bucket->flags & IBF_MULTI) == 0) {
- vector = kmalloc(sizeof(void *) * 4, GFP_KERNEL);
- if(vector == NULL)
- goto free_and_enomem;
- /* We might have slept. */
- if ((bucket->flags & IBF_MULTI) != 0) {
- int ent;
- kfree(vector);
- vector = (void **)bucket->irq_info;
- for(ent = 0; ent < 4; ent++) {
- if (vector[ent] == NULL) {
- vector[ent] = action;
- break;
- }
- }
- if (ent == 4)
- goto free_and_ebusy;
- } else {
- vector[0] = orig;
- vector[1] = action;
- vector[2] = NULL;
- vector[3] = NULL;
- bucket->irq_info = vector;
- bucket->flags |= IBF_MULTI;
- }
- } else {
- int ent;
- vector = (void **)orig;
- for(ent = 0; ent < 4; ent++) {
- if(vector[ent] == NULL) {
- vector[ent] = action;
- break;
- }
- }
- if (ent == 4)
- goto free_and_ebusy;
- }
- } else {
- bucket->irq_info = action;
- 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);
- put_smpaff_in_irqaction(action, 0);
- if(tmp)
- tmp->next = action;
- else
- *(bucket->pil + irq_action) = 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);
- }
- restore_flags(flags);
- if ((bucket != &pil0_dummy_bucket) && (!(irqflags & SA_STATIC_ALLOC)))
- register_irq_proc(__irq_ino(irq));
- #ifdef CONFIG_SMP
- distribute_irqs();
- #endif
- return 0;
- free_and_ebusy:
- kfree(action);
- restore_flags(flags);
- return -EBUSY;
- free_and_enomem:
- kfree(action);
- restore_flags(flags);
- return -ENOMEM;
- }
- void free_irq(unsigned int irq, void *dev_id)
- {
- struct irqaction *action;
- struct irqaction *tmp = NULL;
- unsigned long flags;
- struct ino_bucket *bucket = __bucket(irq), *bp;
- if ((bucket != &pil0_dummy_bucket) &&
- (bucket < &ivector_table[0] ||
- bucket >= &ivector_table[NUM_IVECS])) {
- unsigned int *caller;
- __asm__ __volatile__("mov %%i7, %0" : "=r" (caller));
- printk(KERN_CRIT "free_irq: Old style IRQ removal attempt "
- "from %p, irq %08x.n", caller, irq);
- return;
- }
-
- action = *(bucket->pil + irq_action);
- if(!action->handler) {
- printk("Freeing free IRQ %dn", bucket->pil);
- return;
- }
- if(dev_id) {
- for( ; action; action = action->next) {
- if(action->dev_id == dev_id)
- break;
- tmp = action;
- }
- if(!action) {
- printk("Trying to free free shared IRQ %dn", bucket->pil);
- return;
- }
- } else if(action->flags & SA_SHIRQ) {
- printk("Trying to free shared IRQ %d with NULL device IDn", bucket->pil);
- return;
- }
- if(action->flags & SA_STATIC_ALLOC) {
- printk("Attempt to free statically allocated IRQ %d (%s)n",
- bucket->pil, action->name);
- return;
- }
- save_and_cli(flags);
- if(action && tmp)
- tmp->next = action->next;
- else
- *(bucket->pil + irq_action) = action->next;
- if (bucket != &pil0_dummy_bucket) {
- unsigned long imap = bucket->imap;
- void **vector, *orig;
- int ent;
- orig = bucket->irq_info;
- vector = (void **)orig;
- if ((bucket->flags & IBF_MULTI) != 0) {
- int other = 0;
- void *orphan = NULL;
- for(ent = 0; ent < 4; ent++) {
- if(vector[ent] == action)
- vector[ent] = NULL;
- else if(vector[ent] != NULL) {
- orphan = vector[ent];
- other++;
- }
- }
- /* Only free when no other shared irq
- * uses this bucket.
- */
- if(other) {
- if (other == 1) {
- /* Convert back to non-shared bucket. */
- bucket->irq_info = orphan;
- bucket->flags &= ~(IBF_MULTI);
- kfree(vector);
- }
- goto out;
- }
- } else {
- bucket->irq_info = NULL;
- }
- /* 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++) {
- 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);
- }
- out:
- kfree(action);
- restore_flags(flags);
- }
- #ifdef CONFIG_SMP
- /* Who has the global irq brlock */
- unsigned char global_irq_holder = NO_PROC_ID;
- static void show(char * str)
- {
- int cpu = smp_processor_id();
- int i;
- printk("n%s, CPU %d:n", str, cpu);
- printk("irq: %d [ ", irqs_running());
- for (i = 0; i < smp_num_cpus; i++)
- printk("%u ", __brlock_array[i][BR_GLOBALIRQ_LOCK]);
- printk("]nbh: %d [ ",
- (spin_is_locked(&global_bh_lock) ? 1 : 0));
- for (i = 0; i < smp_num_cpus; i++)
- printk("%u ", local_bh_count(i));
- printk("]n");
- }
- #define MAXCOUNT 100000000
- #if 0
- #define SYNC_OTHER_ULTRAS(x) udelay(x+1)
- #else
- #define SYNC_OTHER_ULTRAS(x) membar("#Sync");
- #endif
- void synchronize_irq(void)
- {
- if (irqs_running()) {
- cli();
- sti();
- }
- }
- static inline void get_irqlock(int cpu)
- {
- int count;
- if ((unsigned char)cpu == global_irq_holder)
- return;
- count = MAXCOUNT;
- again:
- br_write_lock(BR_GLOBALIRQ_LOCK);
- for (;;) {
- spinlock_t *lock;
- if (!irqs_running() &&
- (local_bh_count(smp_processor_id()) || !spin_is_locked(&global_bh_lock)))
- break;
- br_write_unlock(BR_GLOBALIRQ_LOCK);
- lock = &__br_write_locks[BR_GLOBALIRQ_LOCK].lock;
- while (irqs_running() ||
- spin_is_locked(lock) ||
- (!local_bh_count(smp_processor_id()) && spin_is_locked(&global_bh_lock))) {
- if (!--count) {
- show("get_irqlock");
- count = (~0 >> 1);
- }
- __sti();
- SYNC_OTHER_ULTRAS(cpu);
- __cli();
- }
- goto again;
- }
- global_irq_holder = cpu;
- }
- void __global_cli(void)
- {
- unsigned long flags;
- __save_flags(flags);
- if(flags == 0) {
- int cpu = smp_processor_id();
- __cli();
- if (! local_irq_count(cpu))
- get_irqlock(cpu);
- }
- }
- void __global_sti(void)
- {
- int cpu = smp_processor_id();
- if (! local_irq_count(cpu))
- release_irqlock(cpu);
- __sti();
- }
- unsigned long __global_save_flags(void)
- {
- unsigned long flags, local_enabled, retval;
- __save_flags(flags);
- local_enabled = ((flags == 0) ? 1 : 0);
- retval = 2 + local_enabled;
- if (! local_irq_count(smp_processor_id())) {
- if (local_enabled)
- retval = 1;
- if (global_irq_holder == (unsigned char) smp_processor_id())
- retval = 0;
- }
- return retval;
- }
- void __global_restore_flags(unsigned long flags)
- {
- switch (flags) {
- case 0:
- __global_cli();
- break;
- case 1:
- __global_sti();
- break;
- case 2:
- __cli();
- break;
- case 3:
- __sti();
- break;
- default:
- {
- unsigned long pc;
- __asm__ __volatile__("mov %%i7, %0" : "=r" (pc));
- printk("global_restore_flags: Bogon flags(%016lx) caller %016lxn",
- flags, pc);
- }
- }
- }
- #endif /* CONFIG_SMP */
- void catch_disabled_ivec(struct pt_regs *regs)
- {
- int cpu = smp_processor_id();
- struct ino_bucket *bucket = __bucket(*irq_work(cpu, 0));
- /* We can actually see this on Ultra/PCI PCI cards, which are bridges
- * to other devices. Here a single IMAP enabled potentially multiple
- * unique interrupt sources (which each do have a unique ICLR register.
- *
- * So what we do is just register that the IVEC arrived, when registered
- * for real the request_irq() code will check the bit and signal
- * a local CPU interrupt for it.
- */
- #if 0
- printk("IVEC: Spurious interrupt vector (%x) received at (%016lx)n",
- bucket - &ivector_table[0], regs->tpc);
- #endif
- *irq_work(cpu, 0) = 0;
- bucket->pending = 1;
- }
- /* Tune this... */
- #define FORWARD_VOLUME 12
- #ifdef CONFIG_SMP
- static inline void redirect_intr(int cpu, struct ino_bucket *bp)
- {
- /* Ok, here is what is going on:
- * 1) Retargeting IRQs on Starfire is very
- * expensive so just forget about it on them.
- * 2) Moving around very high priority interrupts
- * is a losing game.
- * 3) If the current cpu is idle, interrupts are
- * useful work, so keep them here. But do not
- * pass to our neighbour if he is not very idle.
- * 4) If sysadmin explicitly asks for directed intrs,
- * Just Do It.
- */
- struct irqaction *ap = bp->irq_info;
- unsigned long cpu_mask = get_smpaff_in_irqaction(ap);
- unsigned int buddy, ticks;
- if (cpu_mask == 0)
- cpu_mask = ~0UL;
- if (this_is_starfire != 0 ||
- bp->pil >= 10 || current->pid == 0)
- goto out;
- /* 'cpu' is the MID (ie. UPAID), calculate the MID
- * of our buddy.
- */
- buddy = cpu_number_map(cpu) + 1;
- if (buddy >= NR_CPUS ||
- cpu_logical_map(buddy) == -1)
- buddy = 0;
- ticks = 0;
- while ((cpu_mask & (1UL << buddy)) == 0) {
- buddy++;
- if (buddy >= NR_CPUS ||
- cpu_logical_map(buddy) == -1)
- buddy = cpu_logical_map(0);
- if (++ticks > NR_CPUS) {
- put_smpaff_in_irqaction(ap, 0);
- goto out;
- }
- }
- if (buddy == cpu_number_map(cpu))
- goto out;
- buddy = cpu_logical_map(buddy);
- /* Voo-doo programming. */
- if (cpu_data[buddy].idle_volume < FORWARD_VOLUME)
- goto out;
- /* This just so happens to be correct on Cheetah
- * at the moment.
- */
- buddy <<= 26;
- /* Push it to our buddy. */
- upa_writel(buddy | IMAP_VALID, bp->imap);
- out:
- return;
- }
- #endif
- void handler_irq(int irq, struct pt_regs *regs)
- {
- struct ino_bucket *bp, *nbp;
- 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;
- if (SPARC64_USE_STICK)
- tick_mask = (1UL << 16);
- else
- tick_mask = (1UL << 0);
- if ((irq == 14) && (get_softint() & tick_mask)) {
- irq = 0;
- clr_mask = tick_mask;
- }
- clear_softint(clr_mask);
- }
- #else
- int should_forward = 1;
- clear_softint(1 << irq);
- #endif
- irq_enter(cpu, irq);
- kstat.irqs[cpu][irq]++;
- #ifdef CONFIG_PCI
- if (irq == 9)
- kbd_pt_regs = regs;
- #endif
- /* 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
- for ( ; bp != NULL; bp = nbp) {
- unsigned char flags = bp->flags;
- unsigned char random = 0;
- nbp = __bucket(bp->irq_chain);
- bp->irq_chain = 0;
- if ((flags & IBF_ACTIVE) != 0) {
- #ifdef CONFIG_PCI
- if ((flags & IBF_DMA_SYNC) != 0) {
- upa_readl(dma_sync_reg_table[bp->synctab_ent]);
- upa_readq(pci_dma_wsync);
- }
- #endif
- if ((flags & IBF_MULTI) == 0) {
- struct irqaction *ap = bp->irq_info;
- ap->handler(__irq(bp), ap->dev_id, regs);
- random |= ap->flags & SA_SAMPLE_RANDOM;
- } else {
- void **vector = (void **)bp->irq_info;
- int ent;
- for (ent = 0; ent < 4; ent++) {
- struct irqaction *ap = vector[ent];
- if (ap != NULL) {
- ap->handler(__irq(bp), ap->dev_id, regs);
- random |= ap->flags & SA_SAMPLE_RANDOM;
- }
- }
- }
- /* Only the dummy bucket lacks IMAP/ICLR. */
- if (bp->pil != 0) {
- #ifdef CONFIG_SMP
- if (should_forward) {
- redirect_intr(cpu, bp);
- should_forward = 0;
- }
- #endif
- upa_writel(ICLR_IDLE, bp->iclr);
- /* Test and add entropy */
- if (random)
- add_interrupt_randomness(irq);
- }
- } else
- bp->pending = 1;
- }
- irq_exit(cpu, irq);
- }
- #ifdef CONFIG_BLK_DEV_FD
- extern void floppy_interrupt(int irq, void *dev_cookie, struct pt_regs *regs);
- void sparc_floppy_irq(int irq, void *dev_cookie, struct pt_regs *regs)
- {
- struct irqaction *action = *(irq + irq_action);
- struct ino_bucket *bucket;
- int cpu = smp_processor_id();
- irq_enter(cpu, irq);
- kstat.irqs[cpu][irq]++;
- *(irq_work(cpu, irq)) = 0;
- bucket = get_ino_in_irqaction(action) + ivector_table;
- floppy_interrupt(irq, dev_cookie, regs);
- upa_writel(ICLR_IDLE, bucket->iclr);
- irq_exit(cpu, irq);
- }
- #endif
- /* The following assumes that the branch lies before the place we
- * are branching to. This is the case for a trap vector...
- * You have been warned.
- */
- #define SPARC_BRANCH(dest_addr, inst_addr)
- (0x10800000 | ((((dest_addr)-(inst_addr))>>2)&0x3fffff))
- #define SPARC_NOP (0x01000000)
- static void install_fast_irq(unsigned int cpu_irq,
- void (*handler)(int, void *, struct pt_regs *))
- {
- extern unsigned long sparc64_ttable_tl0;
- unsigned long ttent = (unsigned long) &sparc64_ttable_tl0;
- unsigned int *insns;
- ttent += 0x820;
- ttent += (cpu_irq - 1) << 5;
- insns = (unsigned int *) ttent;
- insns[0] = SPARC_BRANCH(((unsigned long) handler),
- ((unsigned long)&insns[0]));
- insns[1] = SPARC_NOP;
- __asm__ __volatile__("membar #StoreStore; flush %0" : : "r" (ttent));
- }
- int request_fast_irq(unsigned int irq,
- void (*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;
- /* No pil0 dummy buckets allowed here. */
- if (bucket < &ivector_table[0] ||
- bucket >= &ivector_table[NUM_IVECS]) {
- unsigned int *caller;
- __asm__ __volatile__("mov %%i7, %0" : "=r" (caller));
- printk(KERN_CRIT "request_fast_irq: Old style IRQ registry attempt "
- "from %p, irq %08x.n", caller, irq);
- return -EINVAL;
- }
-
- if(!handler)
- return -EINVAL;
- if ((bucket->pil == 0) || (bucket->pil == 14)) {
- printk("request_fast_irq: Trying to register shared IRQ 0 or 14.n");
- return -EBUSY;
- }
- action = *(bucket->pil + irq_action);
- if(action) {
- if(action->flags & SA_SHIRQ)
- panic("Trying to register fast irq when already shared.n");
- if(irqflags & SA_SHIRQ)
- panic("Trying to register fast irq as shared.n");
- printk("request_fast_irq: Trying to register yet already owned.n");
- return -EBUSY;
- }
- /*
- * We do not check for SA_SAMPLE_RANDOM in this path. Neither do we
- * support smp intr affinity in this path.
- */
- save_and_cli(flags);
- if(irqflags & SA_STATIC_ALLOC) {
- if(static_irq_count < MAX_STATIC_ALLOC)
- action = &static_irqaction[static_irq_count++];
- else
- printk("Request for IRQ%d (%s) SA_STATIC_ALLOC failed "
- "using kmallocn", bucket->pil, name);
- }
- if(action == NULL)
- action = (struct irqaction *)kmalloc(sizeof(struct irqaction),
- GFP_KERNEL);
- if(!action) {
- restore_flags(flags);
- return -ENOMEM;
- }
- install_fast_irq(bucket->pil, handler);
- bucket->irq_info = action;
- bucket->flags |= IBF_ACTIVE;
- action->handler = handler;
- action->flags = irqflags;
- action->dev_id = NULL;
- action->name = name;
- action->next = NULL;
- put_ino_in_irqaction(action, irq);
- put_smpaff_in_irqaction(action, 0);
- *(bucket->pil + irq_action) = action;
- enable_irq(irq);
- restore_flags(flags);
- #ifdef CONFIG_SMP
- distribute_irqs();
- #endif
- return 0;
- }
- /* 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;
- }
- int probe_irq_off(unsigned long mask)
- {
- return 0;
- }
- /* This is gets the master TICK_INT timer going. */
- void init_timers(void (*cfunc)(int, void *, struct pt_regs *),
- unsigned long *clock)
- {
- unsigned long pstate;
- extern unsigned long timer_tick_offset;
- int node, err;
- #ifdef CONFIG_SMP
- extern void smp_tick_init(void);
- #endif
- if (!SPARC64_USE_STICK) {
- node = linux_cpus[0].prom_node;
- *clock = prom_getint(node, "clock-frequency");
- } else {
- node = prom_root_node;
- *clock = prom_getint(node, "stick-frequency");
- }
- timer_tick_offset = *clock / HZ;
- #ifdef CONFIG_SMP
- smp_tick_init();
- #endif
- /* Register IRQ handler. */
- err = request_irq(build_irq(0, 0, 0UL, 0UL), cfunc, SA_STATIC_ALLOC,
- "timer", NULL);
- if(err) {
- prom_printf("Serious problem, cannot register TICK_INTn");
- prom_halt();
- }
- /* Guarentee that the following sequences execute
- * uninterrupted.
- */
- __asm__ __volatile__("rdpr %%pstate, %0nt"
- "wrpr %0, %1, %%pstate"
- : "=r" (pstate)
- : "i" (PSTATE_IE));
- /* Set things up so user can access tick register for profiling
- * purposes. Also workaround BB_ERRATA_1 by doing a dummy
- * read back of %tick after writing it.
- */
- __asm__ __volatile__(
- " sethi %%hi(0x80000000), %%g1n"
- " ba,pt %%xcc, 1fn"
- " sllx %%g1, 32, %%g1n"
- " .align 64n"
- "1: rd %%tick, %%g2n"
- " add %%g2, 6, %%g2n"
- " andn %%g2, %%g1, %%g2n"
- " wrpr %%g2, 0, %%tickn"
- " rdpr %%tick, %%g0"
- : /* no outputs */
- : /* no inputs */
- : "g1", "g2");
- /* Workaround for Spitfire Errata (#54 I think??), I discovered
- * this via Sun BugID 4008234, mentioned in Solaris-2.5.1 patch
- * number 103640.
- *
- * On Blackbird writes to %tick_cmpr can fail, the
- * workaround seems to be to execute the wr instruction
- * at the start of an I-cache line, and perform a dummy
- * read back from %tick_cmpr right after writing to it. -DaveM
- */
- if (!SPARC64_USE_STICK) {
- __asm__ __volatile__(
- " rd %%tick, %%g1n"
- " ba,pt %%xcc, 1fn"
- " add %%g1, %0, %%g1n"
- " .align 64n"
- "1: wr %%g1, 0x0, %%tick_cmprn"
- " rd %%tick_cmpr, %%g0"
- : /* no outputs */
- : "r" (timer_tick_offset)
- : "g1");
- } else {
- /* Let the user get at STICK too. */
- __asm__ __volatile__(
- " sethi %%hi(0x80000000), %%g1n"
- " sllx %%g1, 32, %%g1n"
- " rd %%asr24, %%g2n"
- " andn %%g2, %%g1, %%g2n"
- " wr %%g2, 0, %%asr24"
- : /* no outputs */
- : /* no inputs */
- : "g1", "g2");
- __asm__ __volatile__(
- " rd %%asr24, %%g1n"
- " add %%g1, %0, %%g1n"
- " wr %%g1, 0x0, %%asr25"
- : /* no outputs */
- : "r" (timer_tick_offset)
- : "g1");
- }
- /* Restore PSTATE_IE. */
- __asm__ __volatile__("wrpr %0, 0x0, %%pstate"
- : /* no outputs */
- : "r" (pstate));
- sti();
- }
- #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;
- if (tlb_type == cheetah || tlb_type == cheetah_plus) {
- tid = __cpu_logical_map[goal_cpu] << 26;
- tid &= IMAP_AID_SAFARI;
- } else if (this_is_starfire == 0) {
- tid = __cpu_logical_map[goal_cpu] << 26;
- tid &= IMAP_TID_UPA;
- } else {
- tid = (starfire_translate(imap, __cpu_logical_map[goal_cpu]) << 26);
- tid &= IMAP_TID_UPA;
- }
- upa_writel(tid | IMAP_VALID, imap);
- goal_cpu++;
- if(goal_cpu >= NR_CPUS ||
- __cpu_logical_map[goal_cpu] == -1)
- goal_cpu = 0;
- return goal_cpu;
- }
- /* Called from request_irq. */
- static void distribute_irqs(void)
- {
- unsigned long flags;
- int cpu, level;
- save_and_cli(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;
- }
- }
- restore_flags(flags);
- }
- #endif
- 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, %%g2n"
- " ldxa [%%g0] %0, %%g1n"
- " ldxa [%%g2] %1, %%g1n"
- " stxa %%g0, [%%g0] %0n"
- " membar #Syncn"
- : /* no outputs */
- : "i" (ASI_INTR_RECEIVE), "i" (ASI_INTR_R)
- : "g1", "g2");
- }
- void enable_prom_timer(void)
- {
- if(!prom_timers)
- return;
- /* Set it to whatever was there before. */
- prom_timers->limit1 = prom_limit1;
- prom_timers->count1 = 0;
- prom_timers->limit0 = prom_limit0;
- prom_timers->count0 = 0;
- }
- void __init init_IRQ(void)
- {
- static int called = 0;
- if (called == 0) {
- called = 1;
- map_prom_timers();
- kill_prom_timer();
- memset(&ivector_table[0], 0, sizeof(ivector_table));
- #ifndef CONFIG_SMP
- memset(&__up_workvec[0], 0, sizeof(__up_workvec));
- #endif
- }
- /* 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, %%g1nt"
- "or %%g1, %0, %%g1nt"
- "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
- #define HEX_DIGITS 16
- static unsigned int parse_hex_value (const char *buffer,
- unsigned long count, unsigned long *ret)
- {
- unsigned char hexnum [HEX_DIGITS];
- unsigned long value;
- int i;
- if (!count)
- return -EINVAL;
- if (count > HEX_DIGITS)
- count = HEX_DIGITS;
- if (copy_from_user(hexnum, buffer, count))
- return -EFAULT;
- /*
- * Parse the first 8 characters as a hex string, any non-hex char
- * is end-of-string. '00e1', 'e1', '00E1', 'E1' are all the same.
- */
- value = 0;
- for (i = 0; i < count; i++) {
- unsigned int c = hexnum[i];
- switch (c) {
- case '0' ... '9': c -= '0'; break;
- case 'a' ... 'f': c -= 'a'-10; break;
- case 'A' ... 'F': c -= 'A'-10; break;
- default:
- goto out;
- }
- value = (value << 4) | c;
- }
- out:
- *ret = value;
- return 0;
- }
- static unsigned long hw_to_logical(unsigned long mask)
- {
- unsigned long new_mask = 0UL;
- int i;
- for (i = 0; i < NR_CPUS; i++) {
- if (mask & (1UL << i)) {
- int logical = cpu_number_map(i);
- new_mask |= (1UL << logical);
- }
- }
- return new_mask;
- }
- static unsigned long logical_to_hw(unsigned long mask)
- {
- unsigned long new_mask = 0UL;
- int i;
- for (i = 0; i < NR_CPUS; i++) {
- if (mask & (1UL << i)) {
- int hw = cpu_logical_map(i);
- new_mask |= (1UL << hw);
- }
- }
- return new_mask;
- }
- 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 irqaction *ap = bp->irq_info;
- unsigned long mask = get_smpaff_in_irqaction(ap);
- mask = logical_to_hw(mask);
- if (count < HEX_DIGITS+1)
- return -EINVAL;
- return sprintf (page, "%016lxn", mask == 0 ? ~0UL : mask);
- }
- static inline void set_intr_affinity(int irq, unsigned long hw_aff)
- {
- struct ino_bucket *bp = ivector_table + irq;
- unsigned long aff = hw_to_logical(hw_aff);
- /*
- * Users specify affinity in terms of cpu ids, which is what
- * is displayed via /proc/cpuinfo. As soon as we do this,
- * handler_irq() might see and take action.
- */
- put_smpaff_in_irqaction((struct irqaction *)bp->irq_info, aff);
- /* Migration is simply done by the next cpu to service this
- * interrupt.
- */
- }
- static int irq_affinity_write_proc (struct file *file, const char *buffer,
- unsigned long count, void *data)
- {
- int irq = (long) data, full_count = count, err;
- unsigned long new_value;
- err = parse_hex_value(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.
- */
- new_value &= cpu_online_map;
- if (!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", 0);
- }