summaryrefslogtreecommitdiffstats
path: root/arch/ia64/kernel/iosapic.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:39:57 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-18 17:39:57 +0000
commitdc50eab76b709d68175a358d6e23a5a3890764d3 (patch)
treec754d0390db060af0213ff994f0ac310e4cfd6e9 /arch/ia64/kernel/iosapic.c
parentAdding debian version 6.6.15-2. (diff)
downloadlinux-dc50eab76b709d68175a358d6e23a5a3890764d3.tar.xz
linux-dc50eab76b709d68175a358d6e23a5a3890764d3.zip
Merging upstream version 6.7.7.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/ia64/kernel/iosapic.c')
-rw-r--r--arch/ia64/kernel/iosapic.c1137
1 files changed, 0 insertions, 1137 deletions
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
deleted file mode 100644
index 99300850ab..0000000000
--- a/arch/ia64/kernel/iosapic.c
+++ /dev/null
@@ -1,1137 +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>
-#include <asm/xtp.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 */
- irq_data_update_affinity(irq_get_irq_data(irq), cpu_all_mask);
-#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