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author | Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> | 2007-07-17 21:22:23 +0900 |
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committer | Tony Luck <tony.luck@intel.com> | 2007-07-17 09:51:49 -0700 |
commit | e1b30a392835e92581db09a4e8b4b2ad53a0c370 (patch) | |
tree | 1a0dacd37e682dc4c2222f415f8035057d6bbc30 /arch/ia64/kernel/iosapic.c | |
parent | f8c087f31e1d3fbf1f7d0b3ea5e643f535e7de04 (diff) | |
download | linux-e1b30a392835e92581db09a4e8b4b2ad53a0c370.tar.bz2 |
[IA64] Add mapping table between irq and vector
Add mapping tables between irqs and vectors, and its management code.
This is necessary for supporting multiple vector domain because 1:1
mapping between irq and vector will be changed to n:1.
The irq == vector relationship between irqs and vectors is explicitly
remained for percpu interrupts, platform interrupts, isa IRQs and
vectors assigned using assign_irq_vector() because some programs might
depend on it.
And I should consider the following problem.
When pci drivers enabled/disabled devices dynamically, its irq number
is changed to the different one. Therefore, suspend/resume code may
happen problem.
To fix this problem, I bound gsi to irq.
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/iosapic.c')
-rw-r--r-- | arch/ia64/kernel/iosapic.c | 61 |
1 files changed, 35 insertions, 26 deletions
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c index cffb443a557c..cf27cfb4d165 100644 --- a/arch/ia64/kernel/iosapic.c +++ b/arch/ia64/kernel/iosapic.c @@ -117,6 +117,9 @@ static DEFINE_SPINLOCK(iosapic_lock); * These tables map IA-64 vectors to the IOSAPIC pin that generates this * vector. */ + +#define NO_REF_RTE 0 + static struct iosapic { char __iomem *addr; /* base address of IOSAPIC */ unsigned int gsi_base; /* GSI base */ @@ -204,7 +207,7 @@ inline int gsi_to_vector (unsigned int gsi) { int irq = __gsi_to_irq(gsi); - if (irq < 0) + if (check_irq_used(irq) < 0) return -1; return irq_to_vector(irq); } @@ -619,14 +622,18 @@ register_intr (unsigned int gsi, int irq, unsigned char delivery, iosapic_intr_info[irq].count++; iosapic_lists[index].rtes_inuse++; } - else if (irq_is_shared(irq)) { + else if (rte->refcnt == NO_REF_RTE) { struct iosapic_intr_info *info = &iosapic_intr_info[irq]; - if (info->trigger != trigger || info->polarity != polarity) { + if (info->count > 0 && + (info->trigger != trigger || info->polarity != polarity)){ printk (KERN_WARNING "%s: cannot override the interrupt\n", __FUNCTION__); return -EINVAL; } + rte->refcnt++; + iosapic_intr_info[irq].count++; + iosapic_lists[index].rtes_inuse++; } iosapic_intr_info[irq].polarity = polarity; @@ -756,12 +763,17 @@ iosapic_register_intr (unsigned int gsi, irq = __gsi_to_irq(gsi); if (irq > 0) { rte = find_rte(irq, gsi); - rte->refcnt++; - goto unlock_iosapic_lock; - } + if(iosapic_intr_info[irq].count == 0) { + assign_irq_vector(irq); + dynamic_irq_init(irq); + } else if (rte->refcnt != NO_REF_RTE) { + rte->refcnt++; + goto unlock_iosapic_lock; + } + } else + irq = create_irq(); /* If vector is running out, we try to find a sharable vector */ - irq = create_irq(); if (irq < 0) { irq = iosapic_find_sharable_irq(trigger, polarity); if (irq < 0) @@ -832,18 +844,14 @@ iosapic_unregister_intr (unsigned int gsi) if (--rte->refcnt > 0) goto out; - /* Remove the rte entry from the list */ idesc = irq_desc + irq; - spin_lock(&idesc->lock); - list_del(&rte->rte_list); - spin_unlock(&idesc->lock); + rte->refcnt = NO_REF_RTE; /* Mask the interrupt */ low32 = iosapic_intr_info[irq].low32 | IOSAPIC_MASK; iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte->rte_index), low32); iosapic_intr_info[irq].count--; - iosapic_free_rte(rte); index = find_iosapic(gsi); iosapic_lists[index].rtes_inuse--; WARN_ON(iosapic_lists[index].rtes_inuse < 0); @@ -857,21 +865,20 @@ iosapic_unregister_intr (unsigned int gsi) (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), cpu_logical_id(dest), dest, irq_to_vector(irq)); - if (list_empty(&iosapic_intr_info[irq].rtes)) { - /* Sanity check */ - BUG_ON(iosapic_intr_info[irq].count); + if (iosapic_intr_info[irq].count == 0) { #ifdef CONFIG_SMP /* Clear affinity */ cpus_setall(idesc->affinity); #endif /* Clear the interrupt information */ - memset(&iosapic_intr_info[irq], 0, - sizeof(struct iosapic_intr_info)); + iosapic_intr_info[irq].dest = 0; + iosapic_intr_info[irq].dmode = 0; + iosapic_intr_info[irq].polarity = 0; + iosapic_intr_info[irq].trigger = 0; iosapic_intr_info[irq].low32 |= IOSAPIC_MASK; - INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes); - /* Destroy IRQ */ - destroy_irq(irq); + /* Destroy and reserve IRQ */ + destroy_and_reserve_irq(irq); } out: spin_unlock_irqrestore(&iosapic_lock, flags); @@ -892,8 +899,8 @@ iosapic_register_platform_intr (u32 int_type, unsigned int gsi, switch (int_type) { case ACPI_INTERRUPT_PMI: - vector = iosapic_vector; - irq = vector; /* FIXME */ + irq = vector = iosapic_vector; + bind_irq_vector(irq, vector); /* * since PMI vector is alloc'd by FW(ACPI) not by kernel, * we need to make sure the vector is available @@ -909,8 +916,8 @@ iosapic_register_platform_intr (u32 int_type, unsigned int gsi, delivery = IOSAPIC_INIT; break; case ACPI_INTERRUPT_CPEI: - vector = IA64_CPE_VECTOR; - irq = vector; /* FIXME */ + irq = vector = IA64_CPE_VECTOR; + BUG_ON(bind_irq_vector(irq, vector)); delivery = IOSAPIC_LOWEST_PRIORITY; mask = 1; break; @@ -945,8 +952,8 @@ iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi, int vector, irq; unsigned int dest = cpu_physical_id(smp_processor_id()); - vector = isa_irq_to_vector(isa_irq); - irq = vector; /* FIXME */ + irq = vector = isa_irq_to_vector(isa_irq); + BUG_ON(bind_irq_vector(irq, vector)); register_intr(gsi, irq, IOSAPIC_LOWEST_PRIORITY, polarity, trigger); DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n", @@ -966,6 +973,8 @@ iosapic_system_init (int system_pcat_compat) iosapic_intr_info[irq].low32 = IOSAPIC_MASK; /* mark as unused */ INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes); + + iosapic_intr_info[irq].count = 0; } pcat_compat = system_pcat_compat; |