diff options
Diffstat (limited to 'arch/ia64/kernel/iosapic.c')
| -rw-r--r-- | arch/ia64/kernel/iosapic.c | 827 |
1 files changed, 827 insertions, 0 deletions
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c new file mode 100644 index 0000000..c15be5c --- /dev/null +++ b/arch/ia64/kernel/iosapic.c @@ -0,0 +1,827 @@ +/* + * I/O SAPIC support. + * + * Copyright (C) 1999 Intel Corp. + * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com> + * Copyright (C) 2000-2002 J.I. Lee <jung-ik.lee@intel.com> + * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co. + * David Mosberger-Tang <davidm@hpl.hp.com> + * Copyright (C) 1999 VA Linux Systems + * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com> + * + * 00/04/19 D. Mosberger Rewritten to mirror more closely the x86 I/O APIC code. + * In particular, we now have separate handlers for edge + * and level triggered interrupts. + * 00/10/27 Asit Mallick, Goutham Rao <goutham.rao@intel.com> IRQ vector allocation + * PCI to vector mapping, shared PCI interrupts. + * 00/10/27 D. Mosberger Document things a bit more to make them more understandable. + * Clean up much of the old IOSAPIC cruft. + * 01/07/27 J.I. Lee PCI irq routing, Platform/Legacy interrupts and fixes for + * ACPI S5(SoftOff) support. + * 02/01/23 J.I. Lee iosapic pgm fixes for PCI irq routing from _PRT + * 02/01/07 E. Focht <efocht@ess.nec.de> Redirectable interrupt vectors in + * iosapic_set_affinity(), initializations for + * /proc/irq/#/smp_affinity + * 02/04/02 P. Diefenbaugh Cleaned up ACPI PCI IRQ routing. + * 02/04/18 J.I. Lee bug fix in iosapic_init_pci_irq + * 02/04/30 J.I. Lee bug fix in find_iosapic to fix ACPI PCI IRQ to IOSAPIC mapping + * error + * 02/07/29 T. Kochi Allocate interrupt vectors dynamically + * 02/08/04 T. Kochi Cleaned up terminology (irq, global system interrupt, vector, etc.) + * 02/09/20 D. Mosberger Simplified by taking advantage of ACPI's pci_irq code. + * 03/02/19 B. Helgaas Make pcat_compat system-wide, not per-IOSAPIC. + * Remove iosapic_address & gsi_base from external interfaces. + * Rationalize __init/__devinit attributes. + * 04/12/04 Ashok Raj <ashok.raj@intel.com> Intel Corporation 2004 + * Updated to work with irq migration necessary for CPU Hotplug + */ +/* + * Here is what the interrupt logic between a PCI device and the kernel looks like: + * + * (1) A PCI device raises one of the four interrupt pins (INTA, INTB, INTC, INTD). The + * device is uniquely identified by its bus--, and slot-number (the function + * number does not matter here because all functions share the same interrupt + * lines). + * + * (2) The motherboard routes the interrupt line to a pin on a IOSAPIC controller. + * Multiple interrupt lines may have to share the same IOSAPIC pin (if they're level + * triggered and use the same polarity). Each interrupt line has a unique Global + * System Interrupt (GSI) number which can be calculated as the sum of the controller's + * base GSI number and the IOSAPIC pin number to which the line connects. + * + * (3) The IOSAPIC uses an internal routing table entries (RTEs) to map the IOSAPIC pin + * into the IA-64 interrupt vector. This interrupt vector is then sent to the CPU. + * + * (4) The kernel recognizes an interrupt as an IRQ. The IRQ interface is used as + * architecture-independent interrupt handling mechanism in Linux. As an + * IRQ is a number, we have to have IA-64 interrupt vector number <-> IRQ number + * mapping. On smaller systems, we use one-to-one mapping between IA-64 vector and + * IRQ. A platform can implement platform_irq_to_vector(irq) and + * platform_local_vector_to_irq(vector) APIs to differentiate the mapping. + * Please see also include/asm-ia64/hw_irq.h for those APIs. + * + * To sum up, there are three levels of mappings involved: + * + * PCI pin -> global system interrupt (GSI) -> IA-64 vector <-> IRQ + * + * Note: The term "IRQ" is loosely used everywhere in Linux kernel to describe interrupts. + * Now we use "IRQ" only for Linux IRQ's. ISA IRQ (isa_irq) is the only exception in this + * source code. + */ +#include <linux/config.h> + +#include <linux/acpi.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/pci.h> +#include <linux/smp.h> +#include <linux/smp_lock.h> +#include <linux/string.h> + +#include <asm/delay.h> +#include <asm/hw_irq.h> +#include <asm/io.h> +#include <asm/iosapic.h> +#include <asm/machvec.h> +#include <asm/processor.h> +#include <asm/ptrace.h> +#include <asm/system.h> + + +#undef DEBUG_INTERRUPT_ROUTING + +#ifdef DEBUG_INTERRUPT_ROUTING +#define DBG(fmt...) printk(fmt) +#else +#define DBG(fmt...) +#endif + +static DEFINE_SPINLOCK(iosapic_lock); + +/* These tables map IA-64 vectors to the IOSAPIC pin that generates this vector. */ + +static struct iosapic_intr_info { + char __iomem *addr; /* base address of IOSAPIC */ + u32 low32; /* current value of low word of Redirection table entry */ + unsigned int gsi_base; /* first GSI assigned to this IOSAPIC */ + char rte_index; /* IOSAPIC RTE index (-1 => not an IOSAPIC interrupt) */ + unsigned char dmode : 3; /* delivery mode (see iosapic.h) */ + unsigned char polarity: 1; /* interrupt polarity (see iosapic.h) */ + unsigned char trigger : 1; /* trigger mode (see iosapic.h) */ + int refcnt; /* reference counter */ +} iosapic_intr_info[IA64_NUM_VECTORS]; + +static struct iosapic { + char __iomem *addr; /* base address of IOSAPIC */ + unsigned int gsi_base; /* first GSI assigned to this IOSAPIC */ + unsigned short num_rte; /* number of RTE in this IOSAPIC */ +#ifdef CONFIG_NUMA + unsigned short node; /* numa node association via pxm */ +#endif +} iosapic_lists[NR_IOSAPICS]; + +static int num_iosapic; + +static unsigned char pcat_compat __initdata; /* 8259 compatibility flag */ + + +/* + * Find an IOSAPIC associated with a GSI + */ +static inline int +find_iosapic (unsigned int gsi) +{ + int i; + + for (i = 0; i < num_iosapic; i++) { + if ((unsigned) (gsi - iosapic_lists[i].gsi_base) < iosapic_lists[i].num_rte) + return i; + } + + return -1; +} + +static inline int +_gsi_to_vector (unsigned int gsi) +{ + struct iosapic_intr_info *info; + + for (info = iosapic_intr_info; info < iosapic_intr_info + IA64_NUM_VECTORS; ++info) + if (info->gsi_base + info->rte_index == gsi) + return info - iosapic_intr_info; + return -1; +} + +/* + * Translate GSI number to the corresponding IA-64 interrupt vector. If no + * entry exists, return -1. + */ +inline int +gsi_to_vector (unsigned int gsi) +{ + return _gsi_to_vector(gsi); +} + +int +gsi_to_irq (unsigned int gsi) +{ + /* + * XXX fix me: this assumes an identity mapping vetween IA-64 vector and Linux irq + * numbers... + */ + return _gsi_to_vector(gsi); +} + +static void +set_rte (unsigned int vector, unsigned int dest, int mask) +{ + unsigned long pol, trigger, dmode; + u32 low32, high32; + char __iomem *addr; + int rte_index; + char redir; + + DBG(KERN_DEBUG"IOSAPIC: routing vector %d to 0x%x\n", vector, dest); + + rte_index = iosapic_intr_info[vector].rte_index; + if (rte_index < 0) + return; /* not an IOSAPIC interrupt */ + + addr = iosapic_intr_info[vector].addr; + pol = iosapic_intr_info[vector].polarity; + trigger = iosapic_intr_info[vector].trigger; + dmode = iosapic_intr_info[vector].dmode; + vector &= (~IA64_IRQ_REDIRECTED); + + redir = (dmode == IOSAPIC_LOWEST_PRIORITY) ? 1 : 0; + +#ifdef CONFIG_SMP + { + unsigned int irq; + + for (irq = 0; irq < NR_IRQS; ++irq) + if (irq_to_vector(irq) == vector) { + set_irq_affinity_info(irq, (int)(dest & 0xffff), redir); + break; + } + } +#endif + + low32 = ((pol << IOSAPIC_POLARITY_SHIFT) | + (trigger << IOSAPIC_TRIGGER_SHIFT) | + (dmode << IOSAPIC_DELIVERY_SHIFT) | + ((mask ? 1 : 0) << IOSAPIC_MASK_SHIFT) | + vector); + + /* dest contains both id and eid */ + high32 = (dest << IOSAPIC_DEST_SHIFT); + + iosapic_write(addr, IOSAPIC_RTE_HIGH(rte_index), high32); + iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); + iosapic_intr_info[vector].low32 = low32; +} + +static void +nop (unsigned int vector) +{ + /* do nothing... */ +} + +static void +mask_irq (unsigned int irq) +{ + unsigned long flags; + char __iomem *addr; + u32 low32; + int rte_index; + ia64_vector vec = irq_to_vector(irq); + + addr = iosapic_intr_info[vec].addr; + rte_index = iosapic_intr_info[vec].rte_index; + + if (rte_index < 0) + return; /* not an IOSAPIC interrupt! */ + + spin_lock_irqsave(&iosapic_lock, flags); + { + /* set only the mask bit */ + low32 = iosapic_intr_info[vec].low32 |= IOSAPIC_MASK; + iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); + } + spin_unlock_irqrestore(&iosapic_lock, flags); +} + +static void +unmask_irq (unsigned int irq) +{ + unsigned long flags; + char __iomem *addr; + u32 low32; + int rte_index; + ia64_vector vec = irq_to_vector(irq); + + addr = iosapic_intr_info[vec].addr; + rte_index = iosapic_intr_info[vec].rte_index; + if (rte_index < 0) + return; /* not an IOSAPIC interrupt! */ + + spin_lock_irqsave(&iosapic_lock, flags); + { + low32 = iosapic_intr_info[vec].low32 &= ~IOSAPIC_MASK; + iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); + } + spin_unlock_irqrestore(&iosapic_lock, flags); +} + + +static void +iosapic_set_affinity (unsigned int irq, cpumask_t mask) +{ +#ifdef CONFIG_SMP + unsigned long flags; + u32 high32, low32; + int dest, rte_index; + char __iomem *addr; + int redir = (irq & IA64_IRQ_REDIRECTED) ? 1 : 0; + ia64_vector vec; + + irq &= (~IA64_IRQ_REDIRECTED); + vec = irq_to_vector(irq); + + if (cpus_empty(mask)) + return; + + dest = cpu_physical_id(first_cpu(mask)); + + rte_index = iosapic_intr_info[vec].rte_index; + addr = iosapic_intr_info[vec].addr; + + if (rte_index < 0) + return; /* not an IOSAPIC interrupt */ + + set_irq_affinity_info(irq, dest, redir); + + /* dest contains both id and eid */ + high32 = dest << IOSAPIC_DEST_SHIFT; + + spin_lock_irqsave(&iosapic_lock, flags); + { + low32 = iosapic_intr_info[vec].low32 & ~(7 << IOSAPIC_DELIVERY_SHIFT); + + if (redir) + /* change delivery mode to lowest priority */ + low32 |= (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT); + else + /* change delivery mode to fixed */ + low32 |= (IOSAPIC_FIXED << IOSAPIC_DELIVERY_SHIFT); + + iosapic_intr_info[vec].low32 = low32; + iosapic_write(addr, IOSAPIC_RTE_HIGH(rte_index), high32); + iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); + } + spin_unlock_irqrestore(&iosapic_lock, flags); +#endif +} + +/* + * Handlers for level-triggered interrupts. + */ + +static unsigned int +iosapic_startup_level_irq (unsigned int irq) +{ + unmask_irq(irq); + return 0; +} + +static void +iosapic_end_level_irq (unsigned int irq) +{ + ia64_vector vec = irq_to_vector(irq); + + move_irq(irq); + iosapic_eoi(iosapic_intr_info[vec].addr, vec); +} + +#define iosapic_shutdown_level_irq mask_irq +#define iosapic_enable_level_irq unmask_irq +#define iosapic_disable_level_irq mask_irq +#define iosapic_ack_level_irq nop + +struct hw_interrupt_type irq_type_iosapic_level = { + .typename = "IO-SAPIC-level", + .startup = iosapic_startup_level_irq, + .shutdown = iosapic_shutdown_level_irq, + .enable = iosapic_enable_level_irq, + .disable = iosapic_disable_level_irq, + .ack = iosapic_ack_level_irq, + .end = iosapic_end_level_irq, + .set_affinity = iosapic_set_affinity +}; + +/* + * Handlers for edge-triggered interrupts. + */ + +static unsigned int +iosapic_startup_edge_irq (unsigned int irq) +{ + unmask_irq(irq); + /* + * IOSAPIC simply drops interrupts pended while the + * corresponding pin was masked, so we can't know if an + * interrupt is pending already. Let's hope not... + */ + return 0; +} + +static void +iosapic_ack_edge_irq (unsigned int irq) +{ + irq_desc_t *idesc = irq_descp(irq); + + move_irq(irq); + /* + * Once we have recorded IRQ_PENDING already, we can mask the + * interrupt for real. This prevents IRQ storms from unhandled + * devices. + */ + if ((idesc->status & (IRQ_PENDING|IRQ_DISABLED)) == (IRQ_PENDING|IRQ_DISABLED)) + mask_irq(irq); +} + +#define iosapic_enable_edge_irq unmask_irq +#define iosapic_disable_edge_irq nop +#define iosapic_end_edge_irq nop + +struct hw_interrupt_type irq_type_iosapic_edge = { + .typename = "IO-SAPIC-edge", + .startup = iosapic_startup_edge_irq, + .shutdown = iosapic_disable_edge_irq, + .enable = iosapic_enable_edge_irq, + .disable = iosapic_disable_edge_irq, + .ack = iosapic_ack_edge_irq, + .end = iosapic_end_edge_irq, + .set_affinity = iosapic_set_affinity +}; + +unsigned int +iosapic_version (char __iomem *addr) +{ + /* + * IOSAPIC Version Register return 32 bit structure like: + * { + * unsigned int version : 8; + * unsigned int reserved1 : 8; + * unsigned int max_redir : 8; + * unsigned int reserved2 : 8; + * } + */ + return iosapic_read(addr, IOSAPIC_VERSION); +} + +/* + * if the given vector is already owned by other, + * assign a new vector for the other and make the vector available + */ +static void __init +iosapic_reassign_vector (int vector) +{ + int new_vector; + + if (iosapic_intr_info[vector].rte_index >= 0 || iosapic_intr_info[vector].addr + || iosapic_intr_info[vector].gsi_base || iosapic_intr_info[vector].dmode + || iosapic_intr_info[vector].polarity || iosapic_intr_info[vector].trigger) + { + new_vector = assign_irq_vector(AUTO_ASSIGN); + printk(KERN_INFO "Reassigning vector %d to %d\n", vector, new_vector); + memcpy(&iosapic_intr_info[new_vector], &iosapic_intr_info[vector], + sizeof(struct iosapic_intr_info)); + memset(&iosapic_intr_info[vector], 0, sizeof(struct iosapic_intr_info)); + iosapic_intr_info[vector].rte_index = -1; + } +} + +static void +register_intr (unsigned int gsi, int vector, unsigned char delivery, + unsigned long polarity, unsigned long trigger) +{ + irq_desc_t *idesc; + struct hw_interrupt_type *irq_type; + int rte_index; + int index; + unsigned long gsi_base; + void __iomem *iosapic_address; + + index = find_iosapic(gsi); + if (index < 0) { + printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n", __FUNCTION__, gsi); + return; + } + + iosapic_address = iosapic_lists[index].addr; + gsi_base = iosapic_lists[index].gsi_base; + + rte_index = gsi - gsi_base; + iosapic_intr_info[vector].rte_index = rte_index; + iosapic_intr_info[vector].polarity = polarity; + iosapic_intr_info[vector].dmode = delivery; + iosapic_intr_info[vector].addr = iosapic_address; + iosapic_intr_info[vector].gsi_base = gsi_base; + iosapic_intr_info[vector].trigger = trigger; + iosapic_intr_info[vector].refcnt++; + + if (trigger == IOSAPIC_EDGE) + irq_type = &irq_type_iosapic_edge; + else + irq_type = &irq_type_iosapic_level; + + idesc = irq_descp(vector); + if (idesc->handler != irq_type) { + if (idesc->handler != &no_irq_type) + printk(KERN_WARNING "%s: changing vector %d from %s to %s\n", + __FUNCTION__, vector, idesc->handler->typename, irq_type->typename); + idesc->handler = irq_type; + } +} + +static unsigned int +get_target_cpu (unsigned int gsi, int vector) +{ +#ifdef CONFIG_SMP + static int cpu = -1; + + /* + * If the platform supports redirection via XTP, let it + * distribute interrupts. + */ + if (smp_int_redirect & SMP_IRQ_REDIRECTION) + return cpu_physical_id(smp_processor_id()); + + /* + * Some interrupts (ACPI SCI, for instance) are registered + * before the BSP is marked as online. + */ + if (!cpu_online(smp_processor_id())) + return cpu_physical_id(smp_processor_id()); + +#ifdef CONFIG_NUMA + { + int num_cpus, cpu_index, iosapic_index, numa_cpu, i = 0; + cpumask_t cpu_mask; + + iosapic_index = find_iosapic(gsi); + if (iosapic_index < 0 || + iosapic_lists[iosapic_index].node == MAX_NUMNODES) + goto skip_numa_setup; + + cpu_mask = node_to_cpumask(iosapic_lists[iosapic_index].node); + + for_each_cpu_mask(numa_cpu, cpu_mask) { + if (!cpu_online(numa_cpu)) + cpu_clear(numa_cpu, cpu_mask); + } + + num_cpus = cpus_weight(cpu_mask); + + if (!num_cpus) + goto skip_numa_setup; + + /* Use vector assigment to distribute across cpus in node */ + cpu_index = vector % num_cpus; + + for (numa_cpu = first_cpu(cpu_mask) ; i < cpu_index ; i++) + numa_cpu = next_cpu(numa_cpu, cpu_mask); + + if (numa_cpu != NR_CPUS) + return cpu_physical_id(numa_cpu); + } +skip_numa_setup: +#endif + /* + * Otherwise, round-robin interrupt vectors across all the + * processors. (It'd be nice if we could be smarter in the + * case of NUMA.) + */ + do { + if (++cpu >= NR_CPUS) + cpu = 0; + } while (!cpu_online(cpu)); + + return cpu_physical_id(cpu); +#else + return cpu_physical_id(smp_processor_id()); +#endif +} + +/* + * ACPI can describe IOSAPIC interrupts via static tables and namespace + * methods. This provides an interface to register those interrupts and + * program the IOSAPIC RTE. + */ +int +iosapic_register_intr (unsigned int gsi, + unsigned long polarity, unsigned long trigger) +{ + int vector; + unsigned int dest; + unsigned long flags; + + /* + * If this GSI has already been registered (i.e., it's a + * shared interrupt, or we lost a race to register it), + * don't touch the RTE. + */ + spin_lock_irqsave(&iosapic_lock, flags); + { + vector = gsi_to_vector(gsi); + if (vector > 0) { + iosapic_intr_info[vector].refcnt++; + spin_unlock_irqrestore(&iosapic_lock, flags); + return vector; + } + + vector = assign_irq_vector(AUTO_ASSIGN); + dest = get_target_cpu(gsi, vector); + register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, + polarity, trigger); + + set_rte(vector, dest, 1); + } + spin_unlock_irqrestore(&iosapic_lock, flags); + + printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n", + gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"), + (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), + cpu_logical_id(dest), dest, vector); + + return vector; +} + +#ifdef CONFIG_ACPI_DEALLOCATE_IRQ +void +iosapic_unregister_intr (unsigned int gsi) +{ + unsigned long flags; + int irq, vector; + irq_desc_t *idesc; + int rte_index; + unsigned long trigger, polarity; + + /* + * If the irq associated with the gsi is not found, + * iosapic_unregister_intr() is unbalanced. We need to check + * this again after getting locks. + */ + irq = gsi_to_irq(gsi); + if (irq < 0) { + printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n", gsi); + WARN_ON(1); + return; + } + vector = irq_to_vector(irq); + + idesc = irq_descp(irq); + spin_lock_irqsave(&idesc->lock, flags); + spin_lock(&iosapic_lock); + { + rte_index = iosapic_intr_info[vector].rte_index; + if (rte_index < 0) { + spin_unlock(&iosapic_lock); + spin_unlock_irqrestore(&idesc->lock, flags); + printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n", gsi); + WARN_ON(1); + return; + } + + if (--iosapic_intr_info[vector].refcnt > 0) { + spin_unlock(&iosapic_lock); + spin_unlock_irqrestore(&idesc->lock, flags); + return; + } + + /* + * If interrupt handlers still exist on the irq + * associated with the gsi, don't unregister the + * interrupt. + */ + if (idesc->action) { + iosapic_intr_info[vector].refcnt++; + spin_unlock(&iosapic_lock); + spin_unlock_irqrestore(&idesc->lock, flags); + printk(KERN_WARNING "Cannot unregister GSI. IRQ %u is still in use.\n", irq); + return; + } + + /* Clear the interrupt controller descriptor. */ + idesc->handler = &no_irq_type; + + trigger = iosapic_intr_info[vector].trigger; + polarity = iosapic_intr_info[vector].polarity; + + /* Clear the interrupt information. */ + memset(&iosapic_intr_info[vector], 0, sizeof(struct iosapic_intr_info)); + iosapic_intr_info[vector].rte_index = -1; /* mark as unused */ + } + spin_unlock(&iosapic_lock); + spin_unlock_irqrestore(&idesc->lock, flags); + + /* Free the interrupt vector */ + free_irq_vector(vector); + + printk(KERN_INFO "GSI %u (%s, %s) -> vector %d unregisterd.\n", + gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"), + (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), + vector); +} +#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */ + +/* + * ACPI calls this when it finds an entry for a platform interrupt. + * Note that the irq_base and IOSAPIC address must be set in iosapic_init(). + */ +int __init +iosapic_register_platform_intr (u32 int_type, unsigned int gsi, + int iosapic_vector, u16 eid, u16 id, + unsigned long polarity, unsigned long trigger) +{ + static const char * const name[] = {"unknown", "PMI", "INIT", "CPEI"}; + unsigned char delivery; + int vector, mask = 0; + unsigned int dest = ((id << 8) | eid) & 0xffff; + + switch (int_type) { + case ACPI_INTERRUPT_PMI: + vector = iosapic_vector; + /* + * since PMI vector is alloc'd by FW(ACPI) not by kernel, + * we need to make sure the vector is available + */ + iosapic_reassign_vector(vector); + delivery = IOSAPIC_PMI; + break; + case ACPI_INTERRUPT_INIT: + vector = assign_irq_vector(AUTO_ASSIGN); + delivery = IOSAPIC_INIT; + break; + case ACPI_INTERRUPT_CPEI: + vector = IA64_CPE_VECTOR; + delivery = IOSAPIC_LOWEST_PRIORITY; + mask = 1; + break; + default: + printk(KERN_ERR "iosapic_register_platform_irq(): invalid int type 0x%x\n", int_type); + return -1; + } + + register_intr(gsi, vector, delivery, polarity, trigger); + + printk(KERN_INFO "PLATFORM int %s (0x%x): GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n", + int_type < ARRAY_SIZE(name) ? name[int_type] : "unknown", + int_type, gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"), + (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), + cpu_logical_id(dest), dest, vector); + + set_rte(vector, dest, mask); + return vector; +} + + +/* + * ACPI calls this when it finds an entry for a legacy ISA IRQ override. + * Note that the gsi_base and IOSAPIC address must be set in iosapic_init(). + */ +void __init +iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi, + unsigned long polarity, + unsigned long trigger) +{ + int vector; + unsigned int dest = cpu_physical_id(smp_processor_id()); + + vector = isa_irq_to_vector(isa_irq); + + register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, polarity, trigger); + + DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n", + isa_irq, gsi, trigger == IOSAPIC_EDGE ? "edge" : "level", + polarity == IOSAPIC_POL_HIGH ? "high" : "low", + cpu_logical_id(dest), dest, vector); + + set_rte(vector, dest, 1); +} + +void __init +iosapic_system_init (int system_pcat_compat) +{ + int vector; + + for (vector = 0; vector < IA64_NUM_VECTORS; ++vector) + iosapic_intr_info[vector].rte_index = -1; /* mark as unused */ + + pcat_compat = system_pcat_compat; + if (pcat_compat) { + /* + * Disable the compatibility mode interrupts (8259 style), needs IN/OUT support + * enabled. + */ + printk(KERN_INFO "%s: Disabling PC-AT compatible 8259 interrupts\n", __FUNCTION__); + outb(0xff, 0xA1); + outb(0xff, 0x21); + } +} + +void __init +iosapic_init (unsigned long phys_addr, unsigned int gsi_base) +{ + int num_rte; + unsigned int isa_irq, ver; + char __iomem *addr; + + addr = ioremap(phys_addr, 0); + ver = iosapic_version(addr); + + /* + * The MAX_REDIR register holds the highest input pin + * number (starting from 0). + * We add 1 so that we can use it for number of pins (= RTEs) + */ + num_rte = ((ver >> 16) & 0xff) + 1; + + iosapic_lists[num_iosapic].addr = addr; + iosapic_lists[num_iosapic].gsi_base = gsi_base; + iosapic_lists[num_iosapic].num_rte = num_rte; +#ifdef CONFIG_NUMA + iosapic_lists[num_iosapic].node = MAX_NUMNODES; +#endif + num_iosapic++; + + if ((gsi_base == 0) && pcat_compat) { + /* + * Map the legacy ISA devices into the IOSAPIC data. Some of these may + * get reprogrammed later on with data from the ACPI Interrupt Source + * Override table. + */ + for (isa_irq = 0; isa_irq < 16; ++isa_irq) + iosapic_override_isa_irq(isa_irq, isa_irq, IOSAPIC_POL_HIGH, IOSAPIC_EDGE); + } +} + +#ifdef CONFIG_NUMA +void __init +map_iosapic_to_node(unsigned int gsi_base, int node) +{ + int index; + + index = find_iosapic(gsi_base); + if (index < 0) { + printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n", + __FUNCTION__, gsi_base); + return; + } + iosapic_lists[index].node = node; + return; +} +#endif |
