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Diffstat (limited to 'arch/ia64/kernel/iosapic.c')
| -rw-r--r-- | arch/ia64/kernel/iosapic.c | 1136 |
1 files changed, 0 insertions, 1136 deletions
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c deleted file mode 100644 index fad4db20ce65..000000000000 --- a/arch/ia64/kernel/iosapic.c +++ /dev/null @@ -1,1136 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * 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. - * - * 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/acpi.h> -#include <linux/init.h> -#include <linux/irq.h> -#include <linux/kernel.h> -#include <linux/list.h> -#include <linux/pci.h> -#include <linux/slab.h> -#include <linux/smp.h> -#include <linux/string.h> -#include <linux/memblock.h> - -#include <asm/delay.h> -#include <asm/hw_irq.h> -#include <asm/io.h> -#include <asm/iosapic.h> -#include <asm/processor.h> -#include <asm/ptrace.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. - */ - -#define NO_REF_RTE 0 - -static struct iosapic { - char __iomem *addr; /* base address of IOSAPIC */ - unsigned int gsi_base; /* GSI base */ - unsigned short num_rte; /* # of RTEs on this IOSAPIC */ - int rtes_inuse; /* # of RTEs in use on this IOSAPIC */ -#ifdef CONFIG_NUMA - unsigned short node; /* numa node association via pxm */ -#endif - spinlock_t lock; /* lock for indirect reg access */ -} iosapic_lists[NR_IOSAPICS]; - -struct iosapic_rte_info { - struct list_head rte_list; /* RTEs sharing the same vector */ - char rte_index; /* IOSAPIC RTE index */ - int refcnt; /* reference counter */ - struct iosapic *iosapic; -} ____cacheline_aligned; - -static struct iosapic_intr_info { - struct list_head rtes; /* RTEs using this vector (empty => - * not an IOSAPIC interrupt) */ - int count; /* # of registered RTEs */ - u32 low32; /* current value of low word of - * Redirection table entry */ - unsigned int dest; /* destination CPU physical ID */ - 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) */ -} iosapic_intr_info[NR_IRQS]; - -static unsigned char pcat_compat; /* 8259 compatibility flag */ - -static inline void -iosapic_write(struct iosapic *iosapic, unsigned int reg, u32 val) -{ - unsigned long flags; - - spin_lock_irqsave(&iosapic->lock, flags); - __iosapic_write(iosapic->addr, reg, val); - spin_unlock_irqrestore(&iosapic->lock, flags); -} - -/* - * Find an IOSAPIC associated with a GSI - */ -static inline int -find_iosapic (unsigned int gsi) -{ - int i; - - for (i = 0; i < NR_IOSAPICS; i++) { - if ((unsigned) (gsi - iosapic_lists[i].gsi_base) < - iosapic_lists[i].num_rte) - return i; - } - - return -1; -} - -static inline int __gsi_to_irq(unsigned int gsi) -{ - int irq; - struct iosapic_intr_info *info; - struct iosapic_rte_info *rte; - - for (irq = 0; irq < NR_IRQS; irq++) { - info = &iosapic_intr_info[irq]; - list_for_each_entry(rte, &info->rtes, rte_list) - if (rte->iosapic->gsi_base + rte->rte_index == gsi) - return irq; - } - return -1; -} - -int -gsi_to_irq (unsigned int gsi) -{ - unsigned long flags; - int irq; - - spin_lock_irqsave(&iosapic_lock, flags); - irq = __gsi_to_irq(gsi); - spin_unlock_irqrestore(&iosapic_lock, flags); - return irq; -} - -static struct iosapic_rte_info *find_rte(unsigned int irq, unsigned int gsi) -{ - struct iosapic_rte_info *rte; - - list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) - if (rte->iosapic->gsi_base + rte->rte_index == gsi) - return rte; - return NULL; -} - -static void -set_rte (unsigned int gsi, unsigned int irq, unsigned int dest, int mask) -{ - unsigned long pol, trigger, dmode; - u32 low32, high32; - int rte_index; - char redir; - struct iosapic_rte_info *rte; - ia64_vector vector = irq_to_vector(irq); - - DBG(KERN_DEBUG"IOSAPIC: routing vector %d to 0x%x\n", vector, dest); - - rte = find_rte(irq, gsi); - if (!rte) - return; /* not an IOSAPIC interrupt */ - - rte_index = rte->rte_index; - pol = iosapic_intr_info[irq].polarity; - trigger = iosapic_intr_info[irq].trigger; - dmode = iosapic_intr_info[irq].dmode; - - redir = (dmode == IOSAPIC_LOWEST_PRIORITY) ? 1 : 0; - -#ifdef CONFIG_SMP - set_irq_affinity_info(irq, (int)(dest & 0xffff), redir); -#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(rte->iosapic, IOSAPIC_RTE_HIGH(rte_index), high32); - iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32); - iosapic_intr_info[irq].low32 = low32; - iosapic_intr_info[irq].dest = dest; -} - -static void -iosapic_nop (struct irq_data *data) -{ - /* do nothing... */ -} - - -#ifdef CONFIG_KEXEC -void -kexec_disable_iosapic(void) -{ - struct iosapic_intr_info *info; - struct iosapic_rte_info *rte; - ia64_vector vec; - int irq; - - for (irq = 0; irq < NR_IRQS; irq++) { - info = &iosapic_intr_info[irq]; - vec = irq_to_vector(irq); - list_for_each_entry(rte, &info->rtes, - rte_list) { - iosapic_write(rte->iosapic, - IOSAPIC_RTE_LOW(rte->rte_index), - IOSAPIC_MASK|vec); - iosapic_eoi(rte->iosapic->addr, vec); - } - } -} -#endif - -static void -mask_irq (struct irq_data *data) -{ - unsigned int irq = data->irq; - u32 low32; - int rte_index; - struct iosapic_rte_info *rte; - - if (!iosapic_intr_info[irq].count) - return; /* not an IOSAPIC interrupt! */ - - /* set only the mask bit */ - low32 = iosapic_intr_info[irq].low32 |= IOSAPIC_MASK; - list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) { - rte_index = rte->rte_index; - iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32); - } -} - -static void -unmask_irq (struct irq_data *data) -{ - unsigned int irq = data->irq; - u32 low32; - int rte_index; - struct iosapic_rte_info *rte; - - if (!iosapic_intr_info[irq].count) - return; /* not an IOSAPIC interrupt! */ - - low32 = iosapic_intr_info[irq].low32 &= ~IOSAPIC_MASK; - list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) { - rte_index = rte->rte_index; - iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32); - } -} - - -static int -iosapic_set_affinity(struct irq_data *data, const struct cpumask *mask, - bool force) -{ -#ifdef CONFIG_SMP - unsigned int irq = data->irq; - u32 high32, low32; - int cpu, dest, rte_index; - int redir = (irq & IA64_IRQ_REDIRECTED) ? 1 : 0; - struct iosapic_rte_info *rte; - struct iosapic *iosapic; - - irq &= (~IA64_IRQ_REDIRECTED); - - cpu = cpumask_first_and(cpu_online_mask, mask); - if (cpu >= nr_cpu_ids) - return -1; - - if (irq_prepare_move(irq, cpu)) - return -1; - - dest = cpu_physical_id(cpu); - - if (!iosapic_intr_info[irq].count) - return -1; /* not an IOSAPIC interrupt */ - - set_irq_affinity_info(irq, dest, redir); - - /* dest contains both id and eid */ - high32 = dest << IOSAPIC_DEST_SHIFT; - - low32 = iosapic_intr_info[irq].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); - low32 &= IOSAPIC_VECTOR_MASK; - low32 |= irq_to_vector(irq); - - iosapic_intr_info[irq].low32 = low32; - iosapic_intr_info[irq].dest = dest; - list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) { - iosapic = rte->iosapic; - rte_index = rte->rte_index; - iosapic_write(iosapic, IOSAPIC_RTE_HIGH(rte_index), high32); - iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32); - } - -#endif - return 0; -} - -/* - * Handlers for level-triggered interrupts. - */ - -static unsigned int -iosapic_startup_level_irq (struct irq_data *data) -{ - unmask_irq(data); - return 0; -} - -static void -iosapic_unmask_level_irq (struct irq_data *data) -{ - unsigned int irq = data->irq; - ia64_vector vec = irq_to_vector(irq); - struct iosapic_rte_info *rte; - int do_unmask_irq = 0; - - irq_complete_move(irq); - if (unlikely(irqd_is_setaffinity_pending(data))) { - do_unmask_irq = 1; - mask_irq(data); - } else - unmask_irq(data); - - list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) - iosapic_eoi(rte->iosapic->addr, vec); - - if (unlikely(do_unmask_irq)) { - irq_move_masked_irq(data); - unmask_irq(data); - } -} - -#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 iosapic_nop - -static struct irq_chip irq_type_iosapic_level = { - .name = "IO-SAPIC-level", - .irq_startup = iosapic_startup_level_irq, - .irq_shutdown = iosapic_shutdown_level_irq, - .irq_enable = iosapic_enable_level_irq, - .irq_disable = iosapic_disable_level_irq, - .irq_ack = iosapic_ack_level_irq, - .irq_mask = mask_irq, - .irq_unmask = iosapic_unmask_level_irq, - .irq_set_affinity = iosapic_set_affinity -}; - -/* - * Handlers for edge-triggered interrupts. - */ - -static unsigned int -iosapic_startup_edge_irq (struct irq_data *data) -{ - unmask_irq(data); - /* - * 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 (struct irq_data *data) -{ - irq_complete_move(data->irq); - irq_move_irq(data); -} - -#define iosapic_enable_edge_irq unmask_irq -#define iosapic_disable_edge_irq iosapic_nop - -static struct irq_chip irq_type_iosapic_edge = { - .name = "IO-SAPIC-edge", - .irq_startup = iosapic_startup_edge_irq, - .irq_shutdown = iosapic_disable_edge_irq, - .irq_enable = iosapic_enable_edge_irq, - .irq_disable = iosapic_disable_edge_irq, - .irq_ack = iosapic_ack_edge_irq, - .irq_mask = mask_irq, - .irq_unmask = unmask_irq, - .irq_set_affinity = iosapic_set_affinity -}; - -static 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); -} - -static int iosapic_find_sharable_irq(unsigned long trigger, unsigned long pol) -{ - int i, irq = -ENOSPC, min_count = -1; - struct iosapic_intr_info *info; - - /* - * shared vectors for edge-triggered interrupts are not - * supported yet - */ - if (trigger == IOSAPIC_EDGE) - return -EINVAL; - - for (i = 0; i < NR_IRQS; i++) { - info = &iosapic_intr_info[i]; - if (info->trigger == trigger && info->polarity == pol && - (info->dmode == IOSAPIC_FIXED || - info->dmode == IOSAPIC_LOWEST_PRIORITY) && - can_request_irq(i, IRQF_SHARED)) { - if (min_count == -1 || info->count < min_count) { - irq = i; - min_count = info->count; - } - } - } - return irq; -} - -/* - * 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 irq) -{ - int new_irq; - - if (iosapic_intr_info[irq].count) { - new_irq = create_irq(); - if (new_irq < 0) - panic("%s: out of interrupt vectors!\n", __func__); - printk(KERN_INFO "Reassigning vector %d to %d\n", - irq_to_vector(irq), irq_to_vector(new_irq)); - memcpy(&iosapic_intr_info[new_irq], &iosapic_intr_info[irq], - sizeof(struct iosapic_intr_info)); - INIT_LIST_HEAD(&iosapic_intr_info[new_irq].rtes); - list_move(iosapic_intr_info[irq].rtes.next, - &iosapic_intr_info[new_irq].rtes); - memset(&iosapic_intr_info[irq], 0, - sizeof(struct iosapic_intr_info)); - iosapic_intr_info[irq].low32 = IOSAPIC_MASK; - INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes); - } -} - -static inline int irq_is_shared (int irq) -{ - return (iosapic_intr_info[irq].count > 1); -} - -struct irq_chip* -ia64_native_iosapic_get_irq_chip(unsigned long trigger) -{ - if (trigger == IOSAPIC_EDGE) - return &irq_type_iosapic_edge; - else - return &irq_type_iosapic_level; -} - -static int -register_intr (unsigned int gsi, int irq, unsigned char delivery, - unsigned long polarity, unsigned long trigger) -{ - struct irq_chip *chip, *irq_type; - int index; - struct iosapic_rte_info *rte; - - index = find_iosapic(gsi); - if (index < 0) { - printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n", - __func__, gsi); - return -ENODEV; - } - - rte = find_rte(irq, gsi); - if (!rte) { - rte = kzalloc(sizeof (*rte), GFP_ATOMIC); - if (!rte) { - printk(KERN_WARNING "%s: cannot allocate memory\n", - __func__); - return -ENOMEM; - } - - rte->iosapic = &iosapic_lists[index]; - rte->rte_index = gsi - rte->iosapic->gsi_base; - rte->refcnt++; - list_add_tail(&rte->rte_list, &iosapic_intr_info[irq].rtes); - iosapic_intr_info[irq].count++; - iosapic_lists[index].rtes_inuse++; - } - else if (rte->refcnt == NO_REF_RTE) { - struct iosapic_intr_info *info = &iosapic_intr_info[irq]; - if (info->count > 0 && - (info->trigger != trigger || info->polarity != polarity)){ - printk (KERN_WARNING - "%s: cannot override the interrupt\n", - __func__); - return -EINVAL; - } - rte->refcnt++; - iosapic_intr_info[irq].count++; - iosapic_lists[index].rtes_inuse++; - } - - iosapic_intr_info[irq].polarity = polarity; - iosapic_intr_info[irq].dmode = delivery; - iosapic_intr_info[irq].trigger = trigger; - - irq_type = iosapic_get_irq_chip(trigger); - - chip = irq_get_chip(irq); - if (irq_type != NULL && chip != irq_type) { - if (chip != &no_irq_chip) - printk(KERN_WARNING - "%s: changing vector %d from %s to %s\n", - __func__, irq_to_vector(irq), - chip->name, irq_type->name); - chip = irq_type; - } - irq_set_chip_handler_name_locked(irq_get_irq_data(irq), chip, - trigger == IOSAPIC_EDGE ? handle_edge_irq : handle_level_irq, - NULL); - return 0; -} - -static unsigned int -get_target_cpu (unsigned int gsi, int irq) -{ -#ifdef CONFIG_SMP - static int cpu = -1; - extern int cpe_vector; - cpumask_t domain = irq_to_domain(irq); - - /* - * In case of vector shared by multiple RTEs, all RTEs that - * share the vector need to use the same destination CPU. - */ - if (iosapic_intr_info[irq].count) - return iosapic_intr_info[irq].dest; - - /* - * 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()); - - if (cpe_vector > 0 && irq_to_vector(irq) == IA64_CPEP_VECTOR) - return get_cpei_target_cpu(); - -#ifdef CONFIG_NUMA - { - int num_cpus, cpu_index, iosapic_index, numa_cpu, i = 0; - const struct cpumask *cpu_mask; - - iosapic_index = find_iosapic(gsi); - if (iosapic_index < 0 || - iosapic_lists[iosapic_index].node == MAX_NUMNODES) - goto skip_numa_setup; - - cpu_mask = cpumask_of_node(iosapic_lists[iosapic_index].node); - num_cpus = 0; - for_each_cpu_and(numa_cpu, cpu_mask, &domain) { - if (cpu_online(numa_cpu)) - num_cpus++; - } - - if (!num_cpus) - goto skip_numa_setup; - - /* Use irq assignment to distribute across cpus in node */ - cpu_index = irq % num_cpus; - - for_each_cpu_and(numa_cpu, cpu_mask, &domain) - if (cpu_online(numa_cpu) && i++ >= cpu_index) - break; - - if (numa_cpu < nr_cpu_ids) - 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_cpu_ids) - cpu = 0; - } while (!cpu_online(cpu) || !cpumask_test_cpu(cpu, &domain)); - - return cpu_physical_id(cpu); -#else /* CONFIG_SMP */ - return cpu_physical_id(smp_processor_id()); -#endif -} - -static inline unsigned char choose_dmode(void) -{ -#ifdef CONFIG_SMP - if (smp_int_redirect & SMP_IRQ_REDIRECTION) - return IOSAPIC_LOWEST_PRIORITY; -#endif - return IOSAPIC_FIXED; -} - -/* - * 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 irq, mask = 1, err; - unsigned int dest; - unsigned long flags; - struct iosapic_rte_info *rte; - u32 low32; - unsigned char dmode; - struct irq_desc *desc; - - /* - * 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); - irq = __gsi_to_irq(gsi); - if (irq > 0) { - rte = find_rte(irq, gsi); - if(iosapic_intr_info[irq].count == 0) { - assign_irq_vector(irq); - irq_init_desc(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 */ - if (irq < 0) { - irq = iosapic_find_sharable_irq(trigger, polarity); - if (irq < 0) - goto unlock_iosapic_lock; - } - - desc = irq_to_desc(irq); - raw_spin_lock(&desc->lock); - dest = get_target_cpu(gsi, irq); - dmode = choose_dmode(); - err = register_intr(gsi, irq, dmode, polarity, trigger); - if (err < 0) { - raw_spin_unlock(&desc->lock); - irq = err; - goto unlock_iosapic_lock; - } - - /* - * If the vector is shared and already unmasked for other - * interrupt sources, don't mask it. - */ - low32 = iosapic_intr_info[irq].low32; - if (irq_is_shared(irq) && !(low32 & IOSAPIC_MASK)) - mask = 0; - set_rte(gsi, irq, dest, mask); - - 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, irq_to_vector(irq)); - - raw_spin_unlock(&desc->lock); - unlock_iosapic_lock: - spin_unlock_irqrestore(&iosapic_lock, flags); - return irq; -} - -void -iosapic_unregister_intr (unsigned int gsi) -{ - unsigned long flags; - int irq, index; - u32 low32; - unsigned long trigger, polarity; - unsigned int dest; - struct iosapic_rte_info *rte; - - /* - * 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; - } - - spin_lock_irqsave(&iosapic_lock, flags); - if ((rte = find_rte(irq, gsi)) == NULL) { - printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n", - gsi); - WARN_ON(1); - goto out; - } - - if (--rte->refcnt > 0) - goto out; - - 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--; - index = find_iosapic(gsi); - iosapic_lists[index].rtes_inuse--; - WARN_ON(iosapic_lists[index].rtes_inuse < 0); - - trigger = iosapic_intr_info[irq].trigger; - polarity = iosapic_intr_info[irq].polarity; - dest = iosapic_intr_info[irq].dest; - printk(KERN_INFO - "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d unregistered\n", - gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"), - (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), - cpu_logical_id(dest), dest, irq_to_vector(irq)); - - if (iosapic_intr_info[irq].count == 0) { -#ifdef CONFIG_SMP - /* Clear affinity */ - cpumask_setall(irq_get_affinity_mask(irq)); -#endif - /* Clear the interrupt information */ - 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; - - /* Destroy and reserve IRQ */ - destroy_and_reserve_irq(irq); - } - out: - spin_unlock_irqrestore(&iosapic_lock, flags); -} - -/* - * ACPI calls this when it finds an entry for a platform interrupt. - */ -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 irq, vector, mask = 0; - unsigned int dest = ((id << 8) | eid) & 0xffff; - - switch (int_type) { - case ACPI_INTERRUPT_PMI: - irq = vector = iosapic_vector; - bind_irq_vector(irq, vector, CPU_MASK_ALL); - /* - * since PMI vector is alloc'd by FW(ACPI) not by kernel, - * we need to make sure the vector is available - */ - iosapic_reassign_vector(irq); - delivery = IOSAPIC_PMI; - break; - case ACPI_INTERRUPT_INIT: - irq = create_irq(); - if (irq < 0) - panic("%s: out of interrupt vectors!\n", __func__); - vector = irq_to_vector(irq); - delivery = IOSAPIC_INIT; - break; - case ACPI_INTERRUPT_CPEI: - irq = vector = IA64_CPE_VECTOR; - BUG_ON(bind_irq_vector(irq, vector, CPU_MASK_ALL)); - delivery = IOSAPIC_FIXED; - mask = 1; - break; - default: - printk(KERN_ERR "%s: invalid int type 0x%x\n", __func__, - int_type); - return -1; - } - - register_intr(gsi, irq, 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(gsi, irq, dest, mask); - return vector; -} - -/* - * ACPI calls this when it finds an entry for a legacy ISA IRQ override. - */ -void iosapic_override_isa_irq(unsigned int isa_irq, unsigned int gsi, - unsigned long polarity, unsigned long trigger) -{ - int vector, irq; - unsigned int dest = cpu_physical_id(smp_processor_id()); - unsigned char dmode; - - irq = vector = isa_irq_to_vector(isa_irq); - BUG_ON(bind_irq_vector(irq, vector, CPU_MASK_ALL)); - dmode = choose_dmode(); - register_intr(gsi, irq, dmode, 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(gsi, irq, dest, 1); -} - -void __init -ia64_native_iosapic_pcat_compat_init(void) -{ - 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", - __func__); - outb(0xff, 0xA1); - outb(0xff, 0x21); - } -} - -void __init -iosapic_system_init (int system_pcat_compat) -{ - int irq; - - for (irq = 0; irq < NR_IRQS; ++irq) { - 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; - if (pcat_compat) - iosapic_pcat_compat_init(); -} - -static inline int -iosapic_alloc (void) -{ - int index; - - for (index = 0; index < NR_IOSAPICS; index++) - if (!iosapic_lists[index].addr) - return index; - - printk(KERN_WARNING "%s: failed to allocate iosapic\n", __func__); - return -1; -} - -static inline void -iosapic_free (int index) -{ - memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0])); -} - -static inline int -iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver) -{ - int index; - unsigned int gsi_end, base, end; - - /* check gsi range */ - gsi_end = gsi_base + ((ver >> 16) & 0xff); - for (index = 0; index < NR_IOSAPICS; index++) { - if (!iosapic_lists[index].addr) - continue; - - base = iosapic_lists[index].gsi_base; - end = base + iosapic_lists[index].num_rte - 1; - - if (gsi_end < base || end < gsi_base) - continue; /* OK */ - - return -EBUSY; - } - return 0; -} - -static int -iosapic_delete_rte(unsigned int irq, unsigned int gsi) -{ - struct iosapic_rte_info *rte, *temp; - - list_for_each_entry_safe(rte, temp, &iosapic_intr_info[irq].rtes, - rte_list) { - if (rte->iosapic->gsi_base + rte->rte_index == gsi) { - if (rte->refcnt) - return -EBUSY; - - list_del(&rte->rte_list); - kfree(rte); - return 0; - } - } - - return -EINVAL; -} - -int iosapic_init(unsigned long phys_addr, unsigned int gsi_base) -{ - int num_rte, err, index; - unsigned int isa_irq, ver; - char __iomem *addr; - unsigned long flags; - - spin_lock_irqsave(&iosapic_lock, flags); - index = find_iosapic(gsi_base); - if (index >= 0) { - spin_unlock_irqrestore(&iosapic_lock, flags); - return -EBUSY; - } - - addr = ioremap(phys_addr, 0); - if (addr == NULL) { - spin_unlock_irqrestore(&iosapic_lock, flags); - return -ENOMEM; - } - ver = iosapic_version(addr); - if ((err = iosapic_check_gsi_range(gsi_base, ver))) { - iounmap(addr); - spin_unlock_irqrestore(&iosapic_lock, flags); - return err; - } - - /* - * 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; - - index = iosapic_alloc(); - iosapic_lists[index].addr = addr; - iosapic_lists[index].gsi_base = gsi_base; - iosapic_lists[index].num_rte = num_rte; -#ifdef CONFIG_NUMA - iosapic_lists[index].node = MAX_NUMNODES; -#endif - spin_lock_init(&iosapic_lists[index].lock); - spin_unlock_irqrestore(&iosapic_lock, flags); - - 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); - } - return 0; -} - -int iosapic_remove(unsigned int gsi_base) -{ - int i, irq, index, err = 0; - unsigned long flags; - - spin_lock_irqsave(&iosapic_lock, flags); - index = find_iosapic(gsi_base); - if (index < 0) { - printk(KERN_WARNING "%s: No IOSAPIC for GSI base %u\n", - __func__, gsi_base); - goto out; - } - - if (iosapic_lists[index].rtes_inuse) { - err = -EBUSY; - printk(KERN_WARNING "%s: IOSAPIC for GSI base %u is busy\n", - __func__, gsi_base); - goto out; - } - - for (i = gsi_base; i < gsi_base + iosapic_lists[index].num_rte; i++) { - irq = __gsi_to_irq(i); - if (irq < 0) - continue; - - err = iosapic_delete_rte(irq, i); - if (err) - goto out; - } - - iounmap(iosapic_lists[index].addr); - iosapic_free(index); - out: - spin_unlock_irqrestore(&iosapic_lock, flags); - return err; -} - -#ifdef CONFIG_NUMA -void 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", - __func__, gsi_base); - return; - } - iosapic_lists[index].node = node; - return; -} -#endif |