1141 lines
29 KiB
C
1141 lines
29 KiB
C
/*
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* I/O SAPIC support.
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*
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* Copyright (C) 1999 Intel Corp.
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* Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
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* Copyright (C) 2000-2002 J.I. Lee <jung-ik.lee@intel.com>
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* Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co.
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* David Mosberger-Tang <davidm@hpl.hp.com>
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* Copyright (C) 1999 VA Linux Systems
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* Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
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*
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* 00/04/19 D. Mosberger Rewritten to mirror more closely the x86 I/O
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* APIC code. In particular, we now have separate
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* handlers for edge and level triggered
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* interrupts.
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* 00/10/27 Asit Mallick, Goutham Rao <goutham.rao@intel.com> IRQ vector
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* allocation PCI to vector mapping, shared PCI
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* interrupts.
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* 00/10/27 D. Mosberger Document things a bit more to make them more
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* understandable. Clean up much of the old
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* IOSAPIC cruft.
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* 01/07/27 J.I. Lee PCI irq routing, Platform/Legacy interrupts
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* and fixes for ACPI S5(SoftOff) support.
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* 02/01/23 J.I. Lee iosapic pgm fixes for PCI irq routing from _PRT
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* 02/01/07 E. Focht <efocht@ess.nec.de> Redirectable interrupt
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* vectors in iosapic_set_affinity(),
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* initializations for /proc/irq/#/smp_affinity
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* 02/04/02 P. Diefenbaugh Cleaned up ACPI PCI IRQ routing.
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* 02/04/18 J.I. Lee bug fix in iosapic_init_pci_irq
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* 02/04/30 J.I. Lee bug fix in find_iosapic to fix ACPI PCI IRQ to
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* IOSAPIC mapping error
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* 02/07/29 T. Kochi Allocate interrupt vectors dynamically
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* 02/08/04 T. Kochi Cleaned up terminology (irq, global system
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* interrupt, vector, etc.)
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* 02/09/20 D. Mosberger Simplified by taking advantage of ACPI's
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* pci_irq code.
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* 03/02/19 B. Helgaas Make pcat_compat system-wide, not per-IOSAPIC.
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* Remove iosapic_address & gsi_base from
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* external interfaces. Rationalize
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* __init/__devinit attributes.
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* 04/12/04 Ashok Raj <ashok.raj@intel.com> Intel Corporation 2004
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* Updated to work with irq migration necessary
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* for CPU Hotplug
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*/
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/*
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* Here is what the interrupt logic between a PCI device and the kernel looks
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* like:
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*
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* (1) A PCI device raises one of the four interrupt pins (INTA, INTB, INTC,
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* INTD). The device is uniquely identified by its bus-, and slot-number
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* (the function number does not matter here because all functions share
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* the same interrupt lines).
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*
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* (2) The motherboard routes the interrupt line to a pin on a IOSAPIC
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* controller. Multiple interrupt lines may have to share the same
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* IOSAPIC pin (if they're level triggered and use the same polarity).
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* Each interrupt line has a unique Global System Interrupt (GSI) number
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* which can be calculated as the sum of the controller's base GSI number
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* and the IOSAPIC pin number to which the line connects.
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*
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* (3) The IOSAPIC uses an internal routing table entries (RTEs) to map the
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* IOSAPIC pin into the IA-64 interrupt vector. This interrupt vector is then
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* sent to the CPU.
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*
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* (4) The kernel recognizes an interrupt as an IRQ. The IRQ interface is
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* used as architecture-independent interrupt handling mechanism in Linux.
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* As an IRQ is a number, we have to have
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* IA-64 interrupt vector number <-> IRQ number mapping. On smaller
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* systems, we use one-to-one mapping between IA-64 vector and IRQ. A
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* platform can implement platform_irq_to_vector(irq) and
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* platform_local_vector_to_irq(vector) APIs to differentiate the mapping.
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* Please see also arch/ia64/include/asm/hw_irq.h for those APIs.
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*
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* To sum up, there are three levels of mappings involved:
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*
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* PCI pin -> global system interrupt (GSI) -> IA-64 vector <-> IRQ
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*
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* Note: The term "IRQ" is loosely used everywhere in Linux kernel to
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* describe interrupts. Now we use "IRQ" only for Linux IRQ's. ISA IRQ
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* (isa_irq) is the only exception in this source code.
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*/
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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/smp.h>
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#include <linux/string.h>
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#include <linux/bootmem.h>
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#include <asm/delay.h>
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#include <asm/hw_irq.h>
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#include <asm/io.h>
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#include <asm/iosapic.h>
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#include <asm/machvec.h>
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#include <asm/processor.h>
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#include <asm/ptrace.h>
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#undef DEBUG_INTERRUPT_ROUTING
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#ifdef DEBUG_INTERRUPT_ROUTING
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#define DBG(fmt...) printk(fmt)
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#else
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#define DBG(fmt...)
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#endif
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static DEFINE_SPINLOCK(iosapic_lock);
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/*
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* These tables map IA-64 vectors to the IOSAPIC pin that generates this
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* vector.
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*/
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#define NO_REF_RTE 0
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static struct iosapic {
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char __iomem *addr; /* base address of IOSAPIC */
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unsigned int gsi_base; /* GSI base */
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unsigned short num_rte; /* # of RTEs on this IOSAPIC */
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int rtes_inuse; /* # of RTEs in use on this IOSAPIC */
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#ifdef CONFIG_NUMA
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unsigned short node; /* numa node association via pxm */
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#endif
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spinlock_t lock; /* lock for indirect reg access */
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} iosapic_lists[NR_IOSAPICS];
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struct iosapic_rte_info {
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struct list_head rte_list; /* RTEs sharing the same vector */
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char rte_index; /* IOSAPIC RTE index */
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int refcnt; /* reference counter */
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struct iosapic *iosapic;
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} ____cacheline_aligned;
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static struct iosapic_intr_info {
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struct list_head rtes; /* RTEs using this vector (empty =>
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* not an IOSAPIC interrupt) */
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int count; /* # of registered RTEs */
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u32 low32; /* current value of low word of
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* Redirection table entry */
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unsigned int dest; /* destination CPU physical ID */
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unsigned char dmode : 3; /* delivery mode (see iosapic.h) */
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unsigned char polarity: 1; /* interrupt polarity
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* (see iosapic.h) */
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unsigned char trigger : 1; /* trigger mode (see iosapic.h) */
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} iosapic_intr_info[NR_IRQS];
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static unsigned char pcat_compat; /* 8259 compatibility flag */
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static inline void
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iosapic_write(struct iosapic *iosapic, unsigned int reg, u32 val)
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{
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unsigned long flags;
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spin_lock_irqsave(&iosapic->lock, flags);
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__iosapic_write(iosapic->addr, reg, val);
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spin_unlock_irqrestore(&iosapic->lock, flags);
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}
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/*
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* Find an IOSAPIC associated with a GSI
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*/
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static inline int
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find_iosapic (unsigned int gsi)
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{
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int i;
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for (i = 0; i < NR_IOSAPICS; i++) {
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if ((unsigned) (gsi - iosapic_lists[i].gsi_base) <
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iosapic_lists[i].num_rte)
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return i;
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}
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return -1;
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}
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static inline int __gsi_to_irq(unsigned int gsi)
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{
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int irq;
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struct iosapic_intr_info *info;
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struct iosapic_rte_info *rte;
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for (irq = 0; irq < NR_IRQS; irq++) {
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info = &iosapic_intr_info[irq];
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list_for_each_entry(rte, &info->rtes, rte_list)
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if (rte->iosapic->gsi_base + rte->rte_index == gsi)
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return irq;
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}
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return -1;
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}
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int
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gsi_to_irq (unsigned int gsi)
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{
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unsigned long flags;
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int irq;
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spin_lock_irqsave(&iosapic_lock, flags);
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irq = __gsi_to_irq(gsi);
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spin_unlock_irqrestore(&iosapic_lock, flags);
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return irq;
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}
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static struct iosapic_rte_info *find_rte(unsigned int irq, unsigned int gsi)
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{
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struct iosapic_rte_info *rte;
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list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list)
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if (rte->iosapic->gsi_base + rte->rte_index == gsi)
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return rte;
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return NULL;
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}
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static void
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set_rte (unsigned int gsi, unsigned int irq, unsigned int dest, int mask)
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{
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unsigned long pol, trigger, dmode;
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u32 low32, high32;
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int rte_index;
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char redir;
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struct iosapic_rte_info *rte;
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ia64_vector vector = irq_to_vector(irq);
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DBG(KERN_DEBUG"IOSAPIC: routing vector %d to 0x%x\n", vector, dest);
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rte = find_rte(irq, gsi);
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if (!rte)
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return; /* not an IOSAPIC interrupt */
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rte_index = rte->rte_index;
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pol = iosapic_intr_info[irq].polarity;
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trigger = iosapic_intr_info[irq].trigger;
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dmode = iosapic_intr_info[irq].dmode;
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redir = (dmode == IOSAPIC_LOWEST_PRIORITY) ? 1 : 0;
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#ifdef CONFIG_SMP
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set_irq_affinity_info(irq, (int)(dest & 0xffff), redir);
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#endif
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low32 = ((pol << IOSAPIC_POLARITY_SHIFT) |
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(trigger << IOSAPIC_TRIGGER_SHIFT) |
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(dmode << IOSAPIC_DELIVERY_SHIFT) |
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((mask ? 1 : 0) << IOSAPIC_MASK_SHIFT) |
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vector);
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/* dest contains both id and eid */
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high32 = (dest << IOSAPIC_DEST_SHIFT);
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iosapic_write(rte->iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);
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iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
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iosapic_intr_info[irq].low32 = low32;
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iosapic_intr_info[irq].dest = dest;
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}
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static void
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nop (struct irq_data *data)
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{
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/* do nothing... */
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}
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#ifdef CONFIG_KEXEC
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void
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kexec_disable_iosapic(void)
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{
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struct iosapic_intr_info *info;
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struct iosapic_rte_info *rte;
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ia64_vector vec;
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int irq;
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for (irq = 0; irq < NR_IRQS; irq++) {
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info = &iosapic_intr_info[irq];
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vec = irq_to_vector(irq);
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list_for_each_entry(rte, &info->rtes,
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rte_list) {
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iosapic_write(rte->iosapic,
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IOSAPIC_RTE_LOW(rte->rte_index),
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IOSAPIC_MASK|vec);
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iosapic_eoi(rte->iosapic->addr, vec);
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}
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}
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}
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#endif
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static void
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mask_irq (struct irq_data *data)
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{
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unsigned int irq = data->irq;
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u32 low32;
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int rte_index;
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struct iosapic_rte_info *rte;
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if (!iosapic_intr_info[irq].count)
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return; /* not an IOSAPIC interrupt! */
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/* set only the mask bit */
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low32 = iosapic_intr_info[irq].low32 |= IOSAPIC_MASK;
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list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
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rte_index = rte->rte_index;
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iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
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}
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}
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static void
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unmask_irq (struct irq_data *data)
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{
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unsigned int irq = data->irq;
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u32 low32;
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int rte_index;
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struct iosapic_rte_info *rte;
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if (!iosapic_intr_info[irq].count)
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return; /* not an IOSAPIC interrupt! */
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low32 = iosapic_intr_info[irq].low32 &= ~IOSAPIC_MASK;
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list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
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rte_index = rte->rte_index;
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iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
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}
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}
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static int
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iosapic_set_affinity(struct irq_data *data, const struct cpumask *mask,
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bool force)
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{
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#ifdef CONFIG_SMP
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unsigned int irq = data->irq;
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u32 high32, low32;
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int cpu, dest, rte_index;
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int redir = (irq & IA64_IRQ_REDIRECTED) ? 1 : 0;
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struct iosapic_rte_info *rte;
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struct iosapic *iosapic;
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irq &= (~IA64_IRQ_REDIRECTED);
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cpu = cpumask_first_and(cpu_online_mask, mask);
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if (cpu >= nr_cpu_ids)
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return -1;
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if (irq_prepare_move(irq, cpu))
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return -1;
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dest = cpu_physical_id(cpu);
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if (!iosapic_intr_info[irq].count)
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return -1; /* not an IOSAPIC interrupt */
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set_irq_affinity_info(irq, dest, redir);
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/* dest contains both id and eid */
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high32 = dest << IOSAPIC_DEST_SHIFT;
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low32 = iosapic_intr_info[irq].low32 & ~(7 << IOSAPIC_DELIVERY_SHIFT);
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if (redir)
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/* change delivery mode to lowest priority */
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low32 |= (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT);
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else
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/* change delivery mode to fixed */
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low32 |= (IOSAPIC_FIXED << IOSAPIC_DELIVERY_SHIFT);
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low32 &= IOSAPIC_VECTOR_MASK;
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low32 |= irq_to_vector(irq);
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iosapic_intr_info[irq].low32 = low32;
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iosapic_intr_info[irq].dest = dest;
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list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) {
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iosapic = rte->iosapic;
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rte_index = rte->rte_index;
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iosapic_write(iosapic, IOSAPIC_RTE_HIGH(rte_index), high32);
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iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32);
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}
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#endif
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return 0;
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}
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/*
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* Handlers for level-triggered interrupts.
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*/
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static unsigned int
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iosapic_startup_level_irq (struct irq_data *data)
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{
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unmask_irq(data);
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return 0;
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}
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static void
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iosapic_unmask_level_irq (struct irq_data *data)
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{
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unsigned int irq = data->irq;
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ia64_vector vec = irq_to_vector(irq);
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struct iosapic_rte_info *rte;
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int do_unmask_irq = 0;
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irq_complete_move(irq);
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if (unlikely(irqd_is_setaffinity_pending(data))) {
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do_unmask_irq = 1;
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mask_irq(data);
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} else
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unmask_irq(data);
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list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list)
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iosapic_eoi(rte->iosapic->addr, vec);
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if (unlikely(do_unmask_irq)) {
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irq_move_masked_irq(data);
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unmask_irq(data);
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}
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}
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#define iosapic_shutdown_level_irq mask_irq
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#define iosapic_enable_level_irq unmask_irq
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#define iosapic_disable_level_irq mask_irq
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#define iosapic_ack_level_irq nop
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static struct irq_chip irq_type_iosapic_level = {
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.name = "IO-SAPIC-level",
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.irq_startup = iosapic_startup_level_irq,
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.irq_shutdown = iosapic_shutdown_level_irq,
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.irq_enable = iosapic_enable_level_irq,
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.irq_disable = iosapic_disable_level_irq,
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.irq_ack = iosapic_ack_level_irq,
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.irq_mask = mask_irq,
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.irq_unmask = iosapic_unmask_level_irq,
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.irq_set_affinity = iosapic_set_affinity
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};
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/*
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* Handlers for edge-triggered interrupts.
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*/
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static unsigned int
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iosapic_startup_edge_irq (struct irq_data *data)
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{
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unmask_irq(data);
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/*
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* IOSAPIC simply drops interrupts pended while the
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* corresponding pin was masked, so we can't know if an
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* interrupt is pending already. Let's hope not...
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*/
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return 0;
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}
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static void
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iosapic_ack_edge_irq (struct irq_data *data)
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{
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irq_complete_move(data->irq);
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irq_move_irq(data);
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}
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#define iosapic_enable_edge_irq unmask_irq
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#define iosapic_disable_edge_irq nop
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static struct irq_chip irq_type_iosapic_edge = {
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.name = "IO-SAPIC-edge",
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.irq_startup = iosapic_startup_edge_irq,
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.irq_shutdown = iosapic_disable_edge_irq,
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.irq_enable = iosapic_enable_edge_irq,
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.irq_disable = iosapic_disable_edge_irq,
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.irq_ack = iosapic_ack_edge_irq,
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.irq_mask = mask_irq,
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.irq_unmask = unmask_irq,
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.irq_set_affinity = iosapic_set_affinity
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};
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static unsigned int
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iosapic_version (char __iomem *addr)
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{
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/*
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* 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, 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());
|
|
|
|
#ifdef CONFIG_ACPI
|
|
if (cpe_vector > 0 && irq_to_vector(irq) == IA64_CPEP_VECTOR)
|
|
return get_cpei_target_cpu();
|
|
#endif
|
|
|
|
#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) || !cpu_isset(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_irq_data(irq)->affinity);
|
|
#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)
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|
{
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|
int index;
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|
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for (index = 0; index < NR_IOSAPICS; index++)
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if (!iosapic_lists[index].addr)
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return index;
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|
|
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printk(KERN_WARNING "%s: failed to allocate iosapic\n", __func__);
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|
return -1;
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}
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|
|
|
static inline void
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iosapic_free (int index)
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|
{
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|
memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0]));
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|
}
|
|
|
|
static inline int
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iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver)
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|
{
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|
int index;
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|
unsigned int gsi_end, base, end;
|
|
|
|
/* check gsi range */
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|
gsi_end = gsi_base + ((ver >> 16) & 0xff);
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for (index = 0; index < NR_IOSAPICS; index++) {
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|
if (!iosapic_lists[index].addr)
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continue;
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|
|
|
base = iosapic_lists[index].gsi_base;
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end = base + iosapic_lists[index].num_rte - 1;
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|
|
|
if (gsi_end < base || end < gsi_base)
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|
continue; /* OK */
|
|
|
|
return -EBUSY;
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|
}
|
|
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
|