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9d98bcec73
On a 4-socket Brickland system, hot-removing one ioapic is fine.
Hot-removing the 2nd one causes panic in mp_unregister_ioapic()
while calling release_resource().
It is because the iomem_res pointer has already been released
when removing the first ioapic.
To explain the use of &res[num] here: res is assigned to ioapic_resources,
and later in ioapic_insert_resources() we do:
struct resource *r = ioapic_resources;
for_each_ioapic(i) {
insert_resource(&iomem_resource, r);
r++;
}
Here 'r' is treated as an arry of 'struct resource', and the r++ ensures
that each element of the array is inserted separately. Thus we should call
release_resouce() on each element at &res[num].
Fix it by assigning the correct pointers to ioapics[i].iomem_res in
ioapic_setup_resources().
Signed-off-by: Rui Wang <rui.y.wang@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: tony.luck@intel.com
Cc: linux-pci@vger.kernel.org
Cc: rjw@rjwysocki.net
Cc: linux-acpi@vger.kernel.org
Cc: bhelgaas@google.com
Link: http://lkml.kernel.org/r/1465369193-4816-3-git-send-email-rui.y.wang@intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
3016 lines
77 KiB
C
3016 lines
77 KiB
C
/*
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* Intel IO-APIC support for multi-Pentium hosts.
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*
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* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
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*
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* Many thanks to Stig Venaas for trying out countless experimental
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* patches and reporting/debugging problems patiently!
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*
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* (c) 1999, Multiple IO-APIC support, developed by
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* Ken-ichi Yaku <yaku@css1.kbnes.nec.co.jp> and
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* Hidemi Kishimoto <kisimoto@css1.kbnes.nec.co.jp>,
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* further tested and cleaned up by Zach Brown <zab@redhat.com>
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* and Ingo Molnar <mingo@redhat.com>
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*
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* Fixes
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* Maciej W. Rozycki : Bits for genuine 82489DX APICs;
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* thanks to Eric Gilmore
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* and Rolf G. Tews
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* for testing these extensively
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* Paul Diefenbaugh : Added full ACPI support
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*
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* Historical information which is worth to be preserved:
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*
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* - SiS APIC rmw bug:
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*
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* We used to have a workaround for a bug in SiS chips which
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* required to rewrite the index register for a read-modify-write
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* operation as the chip lost the index information which was
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* setup for the read already. We cache the data now, so that
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* workaround has been removed.
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*/
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/pci.h>
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#include <linux/mc146818rtc.h>
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#include <linux/compiler.h>
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/syscore_ops.h>
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#include <linux/freezer.h>
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#include <linux/kthread.h>
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#include <linux/jiffies.h> /* time_after() */
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#include <linux/slab.h>
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#include <linux/bootmem.h>
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#include <asm/irqdomain.h>
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#include <asm/idle.h>
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#include <asm/io.h>
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#include <asm/smp.h>
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#include <asm/cpu.h>
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#include <asm/desc.h>
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#include <asm/proto.h>
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#include <asm/acpi.h>
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#include <asm/dma.h>
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#include <asm/timer.h>
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#include <asm/i8259.h>
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#include <asm/setup.h>
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#include <asm/irq_remapping.h>
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#include <asm/hw_irq.h>
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#include <asm/apic.h>
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#define for_each_ioapic(idx) \
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for ((idx) = 0; (idx) < nr_ioapics; (idx)++)
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#define for_each_ioapic_reverse(idx) \
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for ((idx) = nr_ioapics - 1; (idx) >= 0; (idx)--)
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#define for_each_pin(idx, pin) \
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for ((pin) = 0; (pin) < ioapics[(idx)].nr_registers; (pin)++)
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#define for_each_ioapic_pin(idx, pin) \
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for_each_ioapic((idx)) \
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for_each_pin((idx), (pin))
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#define for_each_irq_pin(entry, head) \
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list_for_each_entry(entry, &head, list)
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static DEFINE_RAW_SPINLOCK(ioapic_lock);
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static DEFINE_MUTEX(ioapic_mutex);
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static unsigned int ioapic_dynirq_base;
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static int ioapic_initialized;
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struct irq_pin_list {
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struct list_head list;
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int apic, pin;
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};
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struct mp_chip_data {
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struct list_head irq_2_pin;
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struct IO_APIC_route_entry entry;
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int trigger;
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int polarity;
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u32 count;
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bool isa_irq;
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};
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struct mp_ioapic_gsi {
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u32 gsi_base;
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u32 gsi_end;
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};
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static struct ioapic {
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/*
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* # of IRQ routing registers
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*/
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int nr_registers;
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/*
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* Saved state during suspend/resume, or while enabling intr-remap.
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*/
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struct IO_APIC_route_entry *saved_registers;
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/* I/O APIC config */
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struct mpc_ioapic mp_config;
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/* IO APIC gsi routing info */
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struct mp_ioapic_gsi gsi_config;
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struct ioapic_domain_cfg irqdomain_cfg;
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struct irq_domain *irqdomain;
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struct resource *iomem_res;
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} ioapics[MAX_IO_APICS];
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#define mpc_ioapic_ver(ioapic_idx) ioapics[ioapic_idx].mp_config.apicver
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int mpc_ioapic_id(int ioapic_idx)
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{
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return ioapics[ioapic_idx].mp_config.apicid;
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}
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unsigned int mpc_ioapic_addr(int ioapic_idx)
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{
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return ioapics[ioapic_idx].mp_config.apicaddr;
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}
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static inline struct mp_ioapic_gsi *mp_ioapic_gsi_routing(int ioapic_idx)
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{
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return &ioapics[ioapic_idx].gsi_config;
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}
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static inline int mp_ioapic_pin_count(int ioapic)
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{
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struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
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return gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1;
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}
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static inline u32 mp_pin_to_gsi(int ioapic, int pin)
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{
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return mp_ioapic_gsi_routing(ioapic)->gsi_base + pin;
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}
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static inline bool mp_is_legacy_irq(int irq)
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{
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return irq >= 0 && irq < nr_legacy_irqs();
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}
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/*
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* Initialize all legacy IRQs and all pins on the first IOAPIC
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* if we have legacy interrupt controller. Kernel boot option "pirq="
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* may rely on non-legacy pins on the first IOAPIC.
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*/
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static inline int mp_init_irq_at_boot(int ioapic, int irq)
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{
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if (!nr_legacy_irqs())
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return 0;
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return ioapic == 0 || mp_is_legacy_irq(irq);
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}
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static inline struct irq_domain *mp_ioapic_irqdomain(int ioapic)
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{
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return ioapics[ioapic].irqdomain;
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}
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int nr_ioapics;
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/* The one past the highest gsi number used */
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u32 gsi_top;
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/* MP IRQ source entries */
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struct mpc_intsrc mp_irqs[MAX_IRQ_SOURCES];
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/* # of MP IRQ source entries */
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int mp_irq_entries;
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#ifdef CONFIG_EISA
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int mp_bus_id_to_type[MAX_MP_BUSSES];
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#endif
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DECLARE_BITMAP(mp_bus_not_pci, MAX_MP_BUSSES);
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int skip_ioapic_setup;
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/**
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* disable_ioapic_support() - disables ioapic support at runtime
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*/
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void disable_ioapic_support(void)
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{
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#ifdef CONFIG_PCI
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noioapicquirk = 1;
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noioapicreroute = -1;
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#endif
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skip_ioapic_setup = 1;
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}
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static int __init parse_noapic(char *str)
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{
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/* disable IO-APIC */
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disable_ioapic_support();
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return 0;
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}
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early_param("noapic", parse_noapic);
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/* Will be called in mpparse/acpi/sfi codes for saving IRQ info */
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void mp_save_irq(struct mpc_intsrc *m)
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{
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int i;
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apic_printk(APIC_VERBOSE, "Int: type %d, pol %d, trig %d, bus %02x,"
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" IRQ %02x, APIC ID %x, APIC INT %02x\n",
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m->irqtype, m->irqflag & 3, (m->irqflag >> 2) & 3, m->srcbus,
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m->srcbusirq, m->dstapic, m->dstirq);
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for (i = 0; i < mp_irq_entries; i++) {
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if (!memcmp(&mp_irqs[i], m, sizeof(*m)))
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return;
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}
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memcpy(&mp_irqs[mp_irq_entries], m, sizeof(*m));
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if (++mp_irq_entries == MAX_IRQ_SOURCES)
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panic("Max # of irq sources exceeded!!\n");
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}
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static void alloc_ioapic_saved_registers(int idx)
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{
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size_t size;
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if (ioapics[idx].saved_registers)
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return;
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size = sizeof(struct IO_APIC_route_entry) * ioapics[idx].nr_registers;
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ioapics[idx].saved_registers = kzalloc(size, GFP_KERNEL);
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if (!ioapics[idx].saved_registers)
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pr_err("IOAPIC %d: suspend/resume impossible!\n", idx);
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}
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static void free_ioapic_saved_registers(int idx)
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{
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kfree(ioapics[idx].saved_registers);
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ioapics[idx].saved_registers = NULL;
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}
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int __init arch_early_ioapic_init(void)
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{
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int i;
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if (!nr_legacy_irqs())
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io_apic_irqs = ~0UL;
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for_each_ioapic(i)
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alloc_ioapic_saved_registers(i);
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return 0;
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}
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struct io_apic {
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unsigned int index;
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unsigned int unused[3];
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unsigned int data;
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unsigned int unused2[11];
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unsigned int eoi;
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};
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static __attribute_const__ struct io_apic __iomem *io_apic_base(int idx)
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{
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return (void __iomem *) __fix_to_virt(FIX_IO_APIC_BASE_0 + idx)
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+ (mpc_ioapic_addr(idx) & ~PAGE_MASK);
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}
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static inline void io_apic_eoi(unsigned int apic, unsigned int vector)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(vector, &io_apic->eoi);
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}
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unsigned int native_io_apic_read(unsigned int apic, unsigned int reg)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(reg, &io_apic->index);
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return readl(&io_apic->data);
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}
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static void io_apic_write(unsigned int apic, unsigned int reg,
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unsigned int value)
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{
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struct io_apic __iomem *io_apic = io_apic_base(apic);
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writel(reg, &io_apic->index);
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writel(value, &io_apic->data);
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}
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union entry_union {
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struct { u32 w1, w2; };
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struct IO_APIC_route_entry entry;
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};
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static struct IO_APIC_route_entry __ioapic_read_entry(int apic, int pin)
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{
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union entry_union eu;
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eu.w1 = io_apic_read(apic, 0x10 + 2 * pin);
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eu.w2 = io_apic_read(apic, 0x11 + 2 * pin);
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return eu.entry;
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}
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static struct IO_APIC_route_entry ioapic_read_entry(int apic, int pin)
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{
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union entry_union eu;
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unsigned long flags;
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raw_spin_lock_irqsave(&ioapic_lock, flags);
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eu.entry = __ioapic_read_entry(apic, pin);
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raw_spin_unlock_irqrestore(&ioapic_lock, flags);
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return eu.entry;
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}
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/*
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* When we write a new IO APIC routing entry, we need to write the high
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* word first! If the mask bit in the low word is clear, we will enable
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* the interrupt, and we need to make sure the entry is fully populated
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* before that happens.
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*/
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static void __ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
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{
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union entry_union eu = {{0, 0}};
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eu.entry = e;
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io_apic_write(apic, 0x11 + 2*pin, eu.w2);
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io_apic_write(apic, 0x10 + 2*pin, eu.w1);
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}
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static void ioapic_write_entry(int apic, int pin, struct IO_APIC_route_entry e)
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{
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unsigned long flags;
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raw_spin_lock_irqsave(&ioapic_lock, flags);
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__ioapic_write_entry(apic, pin, e);
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raw_spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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/*
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* When we mask an IO APIC routing entry, we need to write the low
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* word first, in order to set the mask bit before we change the
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* high bits!
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*/
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static void ioapic_mask_entry(int apic, int pin)
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{
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unsigned long flags;
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union entry_union eu = { .entry.mask = IOAPIC_MASKED };
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raw_spin_lock_irqsave(&ioapic_lock, flags);
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io_apic_write(apic, 0x10 + 2*pin, eu.w1);
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io_apic_write(apic, 0x11 + 2*pin, eu.w2);
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raw_spin_unlock_irqrestore(&ioapic_lock, flags);
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}
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/*
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* The common case is 1:1 IRQ<->pin mappings. Sometimes there are
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* shared ISA-space IRQs, so we have to support them. We are super
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* fast in the common case, and fast for shared ISA-space IRQs.
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*/
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static int __add_pin_to_irq_node(struct mp_chip_data *data,
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int node, int apic, int pin)
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{
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struct irq_pin_list *entry;
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/* don't allow duplicates */
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for_each_irq_pin(entry, data->irq_2_pin)
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if (entry->apic == apic && entry->pin == pin)
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return 0;
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entry = kzalloc_node(sizeof(struct irq_pin_list), GFP_ATOMIC, node);
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if (!entry) {
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pr_err("can not alloc irq_pin_list (%d,%d,%d)\n",
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node, apic, pin);
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return -ENOMEM;
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}
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entry->apic = apic;
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entry->pin = pin;
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list_add_tail(&entry->list, &data->irq_2_pin);
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return 0;
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}
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static void __remove_pin_from_irq(struct mp_chip_data *data, int apic, int pin)
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{
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struct irq_pin_list *tmp, *entry;
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list_for_each_entry_safe(entry, tmp, &data->irq_2_pin, list)
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if (entry->apic == apic && entry->pin == pin) {
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list_del(&entry->list);
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kfree(entry);
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return;
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}
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}
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static void add_pin_to_irq_node(struct mp_chip_data *data,
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int node, int apic, int pin)
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{
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if (__add_pin_to_irq_node(data, node, apic, pin))
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panic("IO-APIC: failed to add irq-pin. Can not proceed\n");
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}
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/*
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* Reroute an IRQ to a different pin.
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*/
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static void __init replace_pin_at_irq_node(struct mp_chip_data *data, int node,
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int oldapic, int oldpin,
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int newapic, int newpin)
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{
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struct irq_pin_list *entry;
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for_each_irq_pin(entry, data->irq_2_pin) {
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if (entry->apic == oldapic && entry->pin == oldpin) {
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entry->apic = newapic;
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entry->pin = newpin;
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/* every one is different, right? */
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return;
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}
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}
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/* old apic/pin didn't exist, so just add new ones */
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add_pin_to_irq_node(data, node, newapic, newpin);
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}
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static void io_apic_modify_irq(struct mp_chip_data *data,
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int mask_and, int mask_or,
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void (*final)(struct irq_pin_list *entry))
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{
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union entry_union eu;
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struct irq_pin_list *entry;
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eu.entry = data->entry;
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eu.w1 &= mask_and;
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eu.w1 |= mask_or;
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data->entry = eu.entry;
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for_each_irq_pin(entry, data->irq_2_pin) {
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io_apic_write(entry->apic, 0x10 + 2 * entry->pin, eu.w1);
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if (final)
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final(entry);
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}
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}
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|
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static void io_apic_sync(struct irq_pin_list *entry)
|
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{
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/*
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* Synchronize the IO-APIC and the CPU by doing
|
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* a dummy read from the IO-APIC
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*/
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struct io_apic __iomem *io_apic;
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io_apic = io_apic_base(entry->apic);
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readl(&io_apic->data);
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}
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static void mask_ioapic_irq(struct irq_data *irq_data)
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{
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struct mp_chip_data *data = irq_data->chip_data;
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unsigned long flags;
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raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_modify_irq(data, ~0, IO_APIC_REDIR_MASKED, &io_apic_sync);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
static void __unmask_ioapic(struct mp_chip_data *data)
|
|
{
|
|
io_apic_modify_irq(data, ~IO_APIC_REDIR_MASKED, 0, NULL);
|
|
}
|
|
|
|
static void unmask_ioapic_irq(struct irq_data *irq_data)
|
|
{
|
|
struct mp_chip_data *data = irq_data->chip_data;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
__unmask_ioapic(data);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* IO-APIC versions below 0x20 don't support EOI register.
|
|
* For the record, here is the information about various versions:
|
|
* 0Xh 82489DX
|
|
* 1Xh I/OAPIC or I/O(x)APIC which are not PCI 2.2 Compliant
|
|
* 2Xh I/O(x)APIC which is PCI 2.2 Compliant
|
|
* 30h-FFh Reserved
|
|
*
|
|
* Some of the Intel ICH Specs (ICH2 to ICH5) documents the io-apic
|
|
* version as 0x2. This is an error with documentation and these ICH chips
|
|
* use io-apic's of version 0x20.
|
|
*
|
|
* For IO-APIC's with EOI register, we use that to do an explicit EOI.
|
|
* Otherwise, we simulate the EOI message manually by changing the trigger
|
|
* mode to edge and then back to level, with RTE being masked during this.
|
|
*/
|
|
static void __eoi_ioapic_pin(int apic, int pin, int vector)
|
|
{
|
|
if (mpc_ioapic_ver(apic) >= 0x20) {
|
|
io_apic_eoi(apic, vector);
|
|
} else {
|
|
struct IO_APIC_route_entry entry, entry1;
|
|
|
|
entry = entry1 = __ioapic_read_entry(apic, pin);
|
|
|
|
/*
|
|
* Mask the entry and change the trigger mode to edge.
|
|
*/
|
|
entry1.mask = IOAPIC_MASKED;
|
|
entry1.trigger = IOAPIC_EDGE;
|
|
|
|
__ioapic_write_entry(apic, pin, entry1);
|
|
|
|
/*
|
|
* Restore the previous level triggered entry.
|
|
*/
|
|
__ioapic_write_entry(apic, pin, entry);
|
|
}
|
|
}
|
|
|
|
static void eoi_ioapic_pin(int vector, struct mp_chip_data *data)
|
|
{
|
|
unsigned long flags;
|
|
struct irq_pin_list *entry;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
for_each_irq_pin(entry, data->irq_2_pin)
|
|
__eoi_ioapic_pin(entry->apic, entry->pin, vector);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
static void clear_IO_APIC_pin(unsigned int apic, unsigned int pin)
|
|
{
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
/* Check delivery_mode to be sure we're not clearing an SMI pin */
|
|
entry = ioapic_read_entry(apic, pin);
|
|
if (entry.delivery_mode == dest_SMI)
|
|
return;
|
|
|
|
/*
|
|
* Make sure the entry is masked and re-read the contents to check
|
|
* if it is a level triggered pin and if the remote-IRR is set.
|
|
*/
|
|
if (entry.mask == IOAPIC_UNMASKED) {
|
|
entry.mask = IOAPIC_MASKED;
|
|
ioapic_write_entry(apic, pin, entry);
|
|
entry = ioapic_read_entry(apic, pin);
|
|
}
|
|
|
|
if (entry.irr) {
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* Make sure the trigger mode is set to level. Explicit EOI
|
|
* doesn't clear the remote-IRR if the trigger mode is not
|
|
* set to level.
|
|
*/
|
|
if (entry.trigger == IOAPIC_EDGE) {
|
|
entry.trigger = IOAPIC_LEVEL;
|
|
ioapic_write_entry(apic, pin, entry);
|
|
}
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
__eoi_ioapic_pin(apic, pin, entry.vector);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* Clear the rest of the bits in the IO-APIC RTE except for the mask
|
|
* bit.
|
|
*/
|
|
ioapic_mask_entry(apic, pin);
|
|
entry = ioapic_read_entry(apic, pin);
|
|
if (entry.irr)
|
|
pr_err("Unable to reset IRR for apic: %d, pin :%d\n",
|
|
mpc_ioapic_id(apic), pin);
|
|
}
|
|
|
|
static void clear_IO_APIC (void)
|
|
{
|
|
int apic, pin;
|
|
|
|
for_each_ioapic_pin(apic, pin)
|
|
clear_IO_APIC_pin(apic, pin);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* support for broken MP BIOSs, enables hand-redirection of PIRQ0-7 to
|
|
* specific CPU-side IRQs.
|
|
*/
|
|
|
|
#define MAX_PIRQS 8
|
|
static int pirq_entries[MAX_PIRQS] = {
|
|
[0 ... MAX_PIRQS - 1] = -1
|
|
};
|
|
|
|
static int __init ioapic_pirq_setup(char *str)
|
|
{
|
|
int i, max;
|
|
int ints[MAX_PIRQS+1];
|
|
|
|
get_options(str, ARRAY_SIZE(ints), ints);
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"PIRQ redirection, working around broken MP-BIOS.\n");
|
|
max = MAX_PIRQS;
|
|
if (ints[0] < MAX_PIRQS)
|
|
max = ints[0];
|
|
|
|
for (i = 0; i < max; i++) {
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"... PIRQ%d -> IRQ %d\n", i, ints[i+1]);
|
|
/*
|
|
* PIRQs are mapped upside down, usually.
|
|
*/
|
|
pirq_entries[MAX_PIRQS-i-1] = ints[i+1];
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
__setup("pirq=", ioapic_pirq_setup);
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
/*
|
|
* Saves all the IO-APIC RTE's
|
|
*/
|
|
int save_ioapic_entries(void)
|
|
{
|
|
int apic, pin;
|
|
int err = 0;
|
|
|
|
for_each_ioapic(apic) {
|
|
if (!ioapics[apic].saved_registers) {
|
|
err = -ENOMEM;
|
|
continue;
|
|
}
|
|
|
|
for_each_pin(apic, pin)
|
|
ioapics[apic].saved_registers[pin] =
|
|
ioapic_read_entry(apic, pin);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Mask all IO APIC entries.
|
|
*/
|
|
void mask_ioapic_entries(void)
|
|
{
|
|
int apic, pin;
|
|
|
|
for_each_ioapic(apic) {
|
|
if (!ioapics[apic].saved_registers)
|
|
continue;
|
|
|
|
for_each_pin(apic, pin) {
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
entry = ioapics[apic].saved_registers[pin];
|
|
if (entry.mask == IOAPIC_UNMASKED) {
|
|
entry.mask = IOAPIC_MASKED;
|
|
ioapic_write_entry(apic, pin, entry);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Restore IO APIC entries which was saved in the ioapic structure.
|
|
*/
|
|
int restore_ioapic_entries(void)
|
|
{
|
|
int apic, pin;
|
|
|
|
for_each_ioapic(apic) {
|
|
if (!ioapics[apic].saved_registers)
|
|
continue;
|
|
|
|
for_each_pin(apic, pin)
|
|
ioapic_write_entry(apic, pin,
|
|
ioapics[apic].saved_registers[pin]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the IRQ entry number of a certain pin.
|
|
*/
|
|
static int find_irq_entry(int ioapic_idx, int pin, int type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mp_irq_entries; i++)
|
|
if (mp_irqs[i].irqtype == type &&
|
|
(mp_irqs[i].dstapic == mpc_ioapic_id(ioapic_idx) ||
|
|
mp_irqs[i].dstapic == MP_APIC_ALL) &&
|
|
mp_irqs[i].dstirq == pin)
|
|
return i;
|
|
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Find the pin to which IRQ[irq] (ISA) is connected
|
|
*/
|
|
static int __init find_isa_irq_pin(int irq, int type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mp_irq_entries; i++) {
|
|
int lbus = mp_irqs[i].srcbus;
|
|
|
|
if (test_bit(lbus, mp_bus_not_pci) &&
|
|
(mp_irqs[i].irqtype == type) &&
|
|
(mp_irqs[i].srcbusirq == irq))
|
|
|
|
return mp_irqs[i].dstirq;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int __init find_isa_irq_apic(int irq, int type)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < mp_irq_entries; i++) {
|
|
int lbus = mp_irqs[i].srcbus;
|
|
|
|
if (test_bit(lbus, mp_bus_not_pci) &&
|
|
(mp_irqs[i].irqtype == type) &&
|
|
(mp_irqs[i].srcbusirq == irq))
|
|
break;
|
|
}
|
|
|
|
if (i < mp_irq_entries) {
|
|
int ioapic_idx;
|
|
|
|
for_each_ioapic(ioapic_idx)
|
|
if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic)
|
|
return ioapic_idx;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
#ifdef CONFIG_EISA
|
|
/*
|
|
* EISA Edge/Level control register, ELCR
|
|
*/
|
|
static int EISA_ELCR(unsigned int irq)
|
|
{
|
|
if (irq < nr_legacy_irqs()) {
|
|
unsigned int port = 0x4d0 + (irq >> 3);
|
|
return (inb(port) >> (irq & 7)) & 1;
|
|
}
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"Broken MPtable reports ISA irq %d\n", irq);
|
|
return 0;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* ISA interrupts are always active high edge triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_ISA_trigger(idx) (IOAPIC_EDGE)
|
|
#define default_ISA_polarity(idx) (IOAPIC_POL_HIGH)
|
|
|
|
/* EISA interrupts are always polarity zero and can be edge or level
|
|
* trigger depending on the ELCR value. If an interrupt is listed as
|
|
* EISA conforming in the MP table, that means its trigger type must
|
|
* be read in from the ELCR */
|
|
|
|
#define default_EISA_trigger(idx) (EISA_ELCR(mp_irqs[idx].srcbusirq))
|
|
#define default_EISA_polarity(idx) default_ISA_polarity(idx)
|
|
|
|
/* PCI interrupts are always active low level triggered,
|
|
* when listed as conforming in the MP table. */
|
|
|
|
#define default_PCI_trigger(idx) (IOAPIC_LEVEL)
|
|
#define default_PCI_polarity(idx) (IOAPIC_POL_LOW)
|
|
|
|
static int irq_polarity(int idx)
|
|
{
|
|
int bus = mp_irqs[idx].srcbus;
|
|
|
|
/*
|
|
* Determine IRQ line polarity (high active or low active):
|
|
*/
|
|
switch (mp_irqs[idx].irqflag & 0x03) {
|
|
case 0:
|
|
/* conforms to spec, ie. bus-type dependent polarity */
|
|
if (test_bit(bus, mp_bus_not_pci))
|
|
return default_ISA_polarity(idx);
|
|
else
|
|
return default_PCI_polarity(idx);
|
|
case 1:
|
|
return IOAPIC_POL_HIGH;
|
|
case 2:
|
|
pr_warn("IOAPIC: Invalid polarity: 2, defaulting to low\n");
|
|
case 3:
|
|
default: /* Pointless default required due to do gcc stupidity */
|
|
return IOAPIC_POL_LOW;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_EISA
|
|
static int eisa_irq_trigger(int idx, int bus, int trigger)
|
|
{
|
|
switch (mp_bus_id_to_type[bus]) {
|
|
case MP_BUS_PCI:
|
|
case MP_BUS_ISA:
|
|
return trigger;
|
|
case MP_BUS_EISA:
|
|
return default_EISA_trigger(idx);
|
|
}
|
|
pr_warn("IOAPIC: Invalid srcbus: %d defaulting to level\n", bus);
|
|
return IOAPIC_LEVEL;
|
|
}
|
|
#else
|
|
static inline int eisa_irq_trigger(int idx, int bus, int trigger)
|
|
{
|
|
return trigger;
|
|
}
|
|
#endif
|
|
|
|
static int irq_trigger(int idx)
|
|
{
|
|
int bus = mp_irqs[idx].srcbus;
|
|
int trigger;
|
|
|
|
/*
|
|
* Determine IRQ trigger mode (edge or level sensitive):
|
|
*/
|
|
switch ((mp_irqs[idx].irqflag >> 2) & 0x03) {
|
|
case 0:
|
|
/* conforms to spec, ie. bus-type dependent trigger mode */
|
|
if (test_bit(bus, mp_bus_not_pci))
|
|
trigger = default_ISA_trigger(idx);
|
|
else
|
|
trigger = default_PCI_trigger(idx);
|
|
/* Take EISA into account */
|
|
return eisa_irq_trigger(idx, bus, trigger);
|
|
case 1:
|
|
return IOAPIC_EDGE;
|
|
case 2:
|
|
pr_warn("IOAPIC: Invalid trigger mode 2 defaulting to level\n");
|
|
case 3:
|
|
default: /* Pointless default required due to do gcc stupidity */
|
|
return IOAPIC_LEVEL;
|
|
}
|
|
}
|
|
|
|
void ioapic_set_alloc_attr(struct irq_alloc_info *info, int node,
|
|
int trigger, int polarity)
|
|
{
|
|
init_irq_alloc_info(info, NULL);
|
|
info->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
|
|
info->ioapic_node = node;
|
|
info->ioapic_trigger = trigger;
|
|
info->ioapic_polarity = polarity;
|
|
info->ioapic_valid = 1;
|
|
}
|
|
|
|
#ifndef CONFIG_ACPI
|
|
int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity);
|
|
#endif
|
|
|
|
static void ioapic_copy_alloc_attr(struct irq_alloc_info *dst,
|
|
struct irq_alloc_info *src,
|
|
u32 gsi, int ioapic_idx, int pin)
|
|
{
|
|
int trigger, polarity;
|
|
|
|
copy_irq_alloc_info(dst, src);
|
|
dst->type = X86_IRQ_ALLOC_TYPE_IOAPIC;
|
|
dst->ioapic_id = mpc_ioapic_id(ioapic_idx);
|
|
dst->ioapic_pin = pin;
|
|
dst->ioapic_valid = 1;
|
|
if (src && src->ioapic_valid) {
|
|
dst->ioapic_node = src->ioapic_node;
|
|
dst->ioapic_trigger = src->ioapic_trigger;
|
|
dst->ioapic_polarity = src->ioapic_polarity;
|
|
} else {
|
|
dst->ioapic_node = NUMA_NO_NODE;
|
|
if (acpi_get_override_irq(gsi, &trigger, &polarity) >= 0) {
|
|
dst->ioapic_trigger = trigger;
|
|
dst->ioapic_polarity = polarity;
|
|
} else {
|
|
/*
|
|
* PCI interrupts are always active low level
|
|
* triggered.
|
|
*/
|
|
dst->ioapic_trigger = IOAPIC_LEVEL;
|
|
dst->ioapic_polarity = IOAPIC_POL_LOW;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int ioapic_alloc_attr_node(struct irq_alloc_info *info)
|
|
{
|
|
return (info && info->ioapic_valid) ? info->ioapic_node : NUMA_NO_NODE;
|
|
}
|
|
|
|
static void mp_register_handler(unsigned int irq, unsigned long trigger)
|
|
{
|
|
irq_flow_handler_t hdl;
|
|
bool fasteoi;
|
|
|
|
if (trigger) {
|
|
irq_set_status_flags(irq, IRQ_LEVEL);
|
|
fasteoi = true;
|
|
} else {
|
|
irq_clear_status_flags(irq, IRQ_LEVEL);
|
|
fasteoi = false;
|
|
}
|
|
|
|
hdl = fasteoi ? handle_fasteoi_irq : handle_edge_irq;
|
|
__irq_set_handler(irq, hdl, 0, fasteoi ? "fasteoi" : "edge");
|
|
}
|
|
|
|
static bool mp_check_pin_attr(int irq, struct irq_alloc_info *info)
|
|
{
|
|
struct mp_chip_data *data = irq_get_chip_data(irq);
|
|
|
|
/*
|
|
* setup_IO_APIC_irqs() programs all legacy IRQs with default trigger
|
|
* and polarity attirbutes. So allow the first user to reprogram the
|
|
* pin with real trigger and polarity attributes.
|
|
*/
|
|
if (irq < nr_legacy_irqs() && data->count == 1) {
|
|
if (info->ioapic_trigger != data->trigger)
|
|
mp_register_handler(irq, info->ioapic_trigger);
|
|
data->entry.trigger = data->trigger = info->ioapic_trigger;
|
|
data->entry.polarity = data->polarity = info->ioapic_polarity;
|
|
}
|
|
|
|
return data->trigger == info->ioapic_trigger &&
|
|
data->polarity == info->ioapic_polarity;
|
|
}
|
|
|
|
static int alloc_irq_from_domain(struct irq_domain *domain, int ioapic, u32 gsi,
|
|
struct irq_alloc_info *info)
|
|
{
|
|
bool legacy = false;
|
|
int irq = -1;
|
|
int type = ioapics[ioapic].irqdomain_cfg.type;
|
|
|
|
switch (type) {
|
|
case IOAPIC_DOMAIN_LEGACY:
|
|
/*
|
|
* Dynamically allocate IRQ number for non-ISA IRQs in the first
|
|
* 16 GSIs on some weird platforms.
|
|
*/
|
|
if (!ioapic_initialized || gsi >= nr_legacy_irqs())
|
|
irq = gsi;
|
|
legacy = mp_is_legacy_irq(irq);
|
|
break;
|
|
case IOAPIC_DOMAIN_STRICT:
|
|
irq = gsi;
|
|
break;
|
|
case IOAPIC_DOMAIN_DYNAMIC:
|
|
break;
|
|
default:
|
|
WARN(1, "ioapic: unknown irqdomain type %d\n", type);
|
|
return -1;
|
|
}
|
|
|
|
return __irq_domain_alloc_irqs(domain, irq, 1,
|
|
ioapic_alloc_attr_node(info),
|
|
info, legacy);
|
|
}
|
|
|
|
/*
|
|
* Need special handling for ISA IRQs because there may be multiple IOAPIC pins
|
|
* sharing the same ISA IRQ number and irqdomain only supports 1:1 mapping
|
|
* between IOAPIC pin and IRQ number. A typical IOAPIC has 24 pins, pin 0-15 are
|
|
* used for legacy IRQs and pin 16-23 are used for PCI IRQs (PIRQ A-H).
|
|
* When ACPI is disabled, only legacy IRQ numbers (IRQ0-15) are available, and
|
|
* some BIOSes may use MP Interrupt Source records to override IRQ numbers for
|
|
* PIRQs instead of reprogramming the interrupt routing logic. Thus there may be
|
|
* multiple pins sharing the same legacy IRQ number when ACPI is disabled.
|
|
*/
|
|
static int alloc_isa_irq_from_domain(struct irq_domain *domain,
|
|
int irq, int ioapic, int pin,
|
|
struct irq_alloc_info *info)
|
|
{
|
|
struct mp_chip_data *data;
|
|
struct irq_data *irq_data = irq_get_irq_data(irq);
|
|
int node = ioapic_alloc_attr_node(info);
|
|
|
|
/*
|
|
* Legacy ISA IRQ has already been allocated, just add pin to
|
|
* the pin list assoicated with this IRQ and program the IOAPIC
|
|
* entry. The IOAPIC entry
|
|
*/
|
|
if (irq_data && irq_data->parent_data) {
|
|
if (!mp_check_pin_attr(irq, info))
|
|
return -EBUSY;
|
|
if (__add_pin_to_irq_node(irq_data->chip_data, node, ioapic,
|
|
info->ioapic_pin))
|
|
return -ENOMEM;
|
|
} else {
|
|
irq = __irq_domain_alloc_irqs(domain, irq, 1, node, info, true);
|
|
if (irq >= 0) {
|
|
irq_data = irq_domain_get_irq_data(domain, irq);
|
|
data = irq_data->chip_data;
|
|
data->isa_irq = true;
|
|
}
|
|
}
|
|
|
|
return irq;
|
|
}
|
|
|
|
static int mp_map_pin_to_irq(u32 gsi, int idx, int ioapic, int pin,
|
|
unsigned int flags, struct irq_alloc_info *info)
|
|
{
|
|
int irq;
|
|
bool legacy = false;
|
|
struct irq_alloc_info tmp;
|
|
struct mp_chip_data *data;
|
|
struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
|
|
|
|
if (!domain)
|
|
return -ENOSYS;
|
|
|
|
if (idx >= 0 && test_bit(mp_irqs[idx].srcbus, mp_bus_not_pci)) {
|
|
irq = mp_irqs[idx].srcbusirq;
|
|
legacy = mp_is_legacy_irq(irq);
|
|
}
|
|
|
|
mutex_lock(&ioapic_mutex);
|
|
if (!(flags & IOAPIC_MAP_ALLOC)) {
|
|
if (!legacy) {
|
|
irq = irq_find_mapping(domain, pin);
|
|
if (irq == 0)
|
|
irq = -ENOENT;
|
|
}
|
|
} else {
|
|
ioapic_copy_alloc_attr(&tmp, info, gsi, ioapic, pin);
|
|
if (legacy)
|
|
irq = alloc_isa_irq_from_domain(domain, irq,
|
|
ioapic, pin, &tmp);
|
|
else if ((irq = irq_find_mapping(domain, pin)) == 0)
|
|
irq = alloc_irq_from_domain(domain, ioapic, gsi, &tmp);
|
|
else if (!mp_check_pin_attr(irq, &tmp))
|
|
irq = -EBUSY;
|
|
if (irq >= 0) {
|
|
data = irq_get_chip_data(irq);
|
|
data->count++;
|
|
}
|
|
}
|
|
mutex_unlock(&ioapic_mutex);
|
|
|
|
return irq;
|
|
}
|
|
|
|
static int pin_2_irq(int idx, int ioapic, int pin, unsigned int flags)
|
|
{
|
|
u32 gsi = mp_pin_to_gsi(ioapic, pin);
|
|
|
|
/*
|
|
* Debugging check, we are in big trouble if this message pops up!
|
|
*/
|
|
if (mp_irqs[idx].dstirq != pin)
|
|
pr_err("broken BIOS or MPTABLE parser, ayiee!!\n");
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* PCI IRQ command line redirection. Yes, limits are hardcoded.
|
|
*/
|
|
if ((pin >= 16) && (pin <= 23)) {
|
|
if (pirq_entries[pin-16] != -1) {
|
|
if (!pirq_entries[pin-16]) {
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"disabling PIRQ%d\n", pin-16);
|
|
} else {
|
|
int irq = pirq_entries[pin-16];
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"using PIRQ%d -> IRQ %d\n",
|
|
pin-16, irq);
|
|
return irq;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, NULL);
|
|
}
|
|
|
|
int mp_map_gsi_to_irq(u32 gsi, unsigned int flags, struct irq_alloc_info *info)
|
|
{
|
|
int ioapic, pin, idx;
|
|
|
|
ioapic = mp_find_ioapic(gsi);
|
|
if (ioapic < 0)
|
|
return -1;
|
|
|
|
pin = mp_find_ioapic_pin(ioapic, gsi);
|
|
idx = find_irq_entry(ioapic, pin, mp_INT);
|
|
if ((flags & IOAPIC_MAP_CHECK) && idx < 0)
|
|
return -1;
|
|
|
|
return mp_map_pin_to_irq(gsi, idx, ioapic, pin, flags, info);
|
|
}
|
|
|
|
void mp_unmap_irq(int irq)
|
|
{
|
|
struct irq_data *irq_data = irq_get_irq_data(irq);
|
|
struct mp_chip_data *data;
|
|
|
|
if (!irq_data || !irq_data->domain)
|
|
return;
|
|
|
|
data = irq_data->chip_data;
|
|
if (!data || data->isa_irq)
|
|
return;
|
|
|
|
mutex_lock(&ioapic_mutex);
|
|
if (--data->count == 0)
|
|
irq_domain_free_irqs(irq, 1);
|
|
mutex_unlock(&ioapic_mutex);
|
|
}
|
|
|
|
/*
|
|
* Find a specific PCI IRQ entry.
|
|
* Not an __init, possibly needed by modules
|
|
*/
|
|
int IO_APIC_get_PCI_irq_vector(int bus, int slot, int pin)
|
|
{
|
|
int irq, i, best_ioapic = -1, best_idx = -1;
|
|
|
|
apic_printk(APIC_DEBUG,
|
|
"querying PCI -> IRQ mapping bus:%d, slot:%d, pin:%d.\n",
|
|
bus, slot, pin);
|
|
if (test_bit(bus, mp_bus_not_pci)) {
|
|
apic_printk(APIC_VERBOSE,
|
|
"PCI BIOS passed nonexistent PCI bus %d!\n", bus);
|
|
return -1;
|
|
}
|
|
|
|
for (i = 0; i < mp_irq_entries; i++) {
|
|
int lbus = mp_irqs[i].srcbus;
|
|
int ioapic_idx, found = 0;
|
|
|
|
if (bus != lbus || mp_irqs[i].irqtype != mp_INT ||
|
|
slot != ((mp_irqs[i].srcbusirq >> 2) & 0x1f))
|
|
continue;
|
|
|
|
for_each_ioapic(ioapic_idx)
|
|
if (mpc_ioapic_id(ioapic_idx) == mp_irqs[i].dstapic ||
|
|
mp_irqs[i].dstapic == MP_APIC_ALL) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
if (!found)
|
|
continue;
|
|
|
|
/* Skip ISA IRQs */
|
|
irq = pin_2_irq(i, ioapic_idx, mp_irqs[i].dstirq, 0);
|
|
if (irq > 0 && !IO_APIC_IRQ(irq))
|
|
continue;
|
|
|
|
if (pin == (mp_irqs[i].srcbusirq & 3)) {
|
|
best_idx = i;
|
|
best_ioapic = ioapic_idx;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Use the first all-but-pin matching entry as a
|
|
* best-guess fuzzy result for broken mptables.
|
|
*/
|
|
if (best_idx < 0) {
|
|
best_idx = i;
|
|
best_ioapic = ioapic_idx;
|
|
}
|
|
}
|
|
if (best_idx < 0)
|
|
return -1;
|
|
|
|
out:
|
|
return pin_2_irq(best_idx, best_ioapic, mp_irqs[best_idx].dstirq,
|
|
IOAPIC_MAP_ALLOC);
|
|
}
|
|
EXPORT_SYMBOL(IO_APIC_get_PCI_irq_vector);
|
|
|
|
static struct irq_chip ioapic_chip, ioapic_ir_chip;
|
|
|
|
#ifdef CONFIG_X86_32
|
|
static inline int IO_APIC_irq_trigger(int irq)
|
|
{
|
|
int apic, idx, pin;
|
|
|
|
for_each_ioapic_pin(apic, pin) {
|
|
idx = find_irq_entry(apic, pin, mp_INT);
|
|
if ((idx != -1) && (irq == pin_2_irq(idx, apic, pin, 0)))
|
|
return irq_trigger(idx);
|
|
}
|
|
/*
|
|
* nonexistent IRQs are edge default
|
|
*/
|
|
return 0;
|
|
}
|
|
#else
|
|
static inline int IO_APIC_irq_trigger(int irq)
|
|
{
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
static void __init setup_IO_APIC_irqs(void)
|
|
{
|
|
unsigned int ioapic, pin;
|
|
int idx;
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG "init IO_APIC IRQs\n");
|
|
|
|
for_each_ioapic_pin(ioapic, pin) {
|
|
idx = find_irq_entry(ioapic, pin, mp_INT);
|
|
if (idx < 0)
|
|
apic_printk(APIC_VERBOSE,
|
|
KERN_DEBUG " apic %d pin %d not connected\n",
|
|
mpc_ioapic_id(ioapic), pin);
|
|
else
|
|
pin_2_irq(idx, ioapic, pin,
|
|
ioapic ? 0 : IOAPIC_MAP_ALLOC);
|
|
}
|
|
}
|
|
|
|
void ioapic_zap_locks(void)
|
|
{
|
|
raw_spin_lock_init(&ioapic_lock);
|
|
}
|
|
|
|
static void io_apic_print_entries(unsigned int apic, unsigned int nr_entries)
|
|
{
|
|
int i;
|
|
char buf[256];
|
|
struct IO_APIC_route_entry entry;
|
|
struct IR_IO_APIC_route_entry *ir_entry = (void *)&entry;
|
|
|
|
printk(KERN_DEBUG "IOAPIC %d:\n", apic);
|
|
for (i = 0; i <= nr_entries; i++) {
|
|
entry = ioapic_read_entry(apic, i);
|
|
snprintf(buf, sizeof(buf),
|
|
" pin%02x, %s, %s, %s, V(%02X), IRR(%1d), S(%1d)",
|
|
i,
|
|
entry.mask == IOAPIC_MASKED ? "disabled" : "enabled ",
|
|
entry.trigger == IOAPIC_LEVEL ? "level" : "edge ",
|
|
entry.polarity == IOAPIC_POL_LOW ? "low " : "high",
|
|
entry.vector, entry.irr, entry.delivery_status);
|
|
if (ir_entry->format)
|
|
printk(KERN_DEBUG "%s, remapped, I(%04X), Z(%X)\n",
|
|
buf, (ir_entry->index << 15) | ir_entry->index,
|
|
ir_entry->zero);
|
|
else
|
|
printk(KERN_DEBUG "%s, %s, D(%02X), M(%1d)\n",
|
|
buf,
|
|
entry.dest_mode == IOAPIC_DEST_MODE_LOGICAL ?
|
|
"logical " : "physical",
|
|
entry.dest, entry.delivery_mode);
|
|
}
|
|
}
|
|
|
|
static void __init print_IO_APIC(int ioapic_idx)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
union IO_APIC_reg_01 reg_01;
|
|
union IO_APIC_reg_02 reg_02;
|
|
union IO_APIC_reg_03 reg_03;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(ioapic_idx, 0);
|
|
reg_01.raw = io_apic_read(ioapic_idx, 1);
|
|
if (reg_01.bits.version >= 0x10)
|
|
reg_02.raw = io_apic_read(ioapic_idx, 2);
|
|
if (reg_01.bits.version >= 0x20)
|
|
reg_03.raw = io_apic_read(ioapic_idx, 3);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
printk(KERN_DEBUG "IO APIC #%d......\n", mpc_ioapic_id(ioapic_idx));
|
|
printk(KERN_DEBUG ".... register #00: %08X\n", reg_00.raw);
|
|
printk(KERN_DEBUG "....... : physical APIC id: %02X\n", reg_00.bits.ID);
|
|
printk(KERN_DEBUG "....... : Delivery Type: %X\n", reg_00.bits.delivery_type);
|
|
printk(KERN_DEBUG "....... : LTS : %X\n", reg_00.bits.LTS);
|
|
|
|
printk(KERN_DEBUG ".... register #01: %08X\n", *(int *)®_01);
|
|
printk(KERN_DEBUG "....... : max redirection entries: %02X\n",
|
|
reg_01.bits.entries);
|
|
|
|
printk(KERN_DEBUG "....... : PRQ implemented: %X\n", reg_01.bits.PRQ);
|
|
printk(KERN_DEBUG "....... : IO APIC version: %02X\n",
|
|
reg_01.bits.version);
|
|
|
|
/*
|
|
* Some Intel chipsets with IO APIC VERSION of 0x1? don't have reg_02,
|
|
* but the value of reg_02 is read as the previous read register
|
|
* value, so ignore it if reg_02 == reg_01.
|
|
*/
|
|
if (reg_01.bits.version >= 0x10 && reg_02.raw != reg_01.raw) {
|
|
printk(KERN_DEBUG ".... register #02: %08X\n", reg_02.raw);
|
|
printk(KERN_DEBUG "....... : arbitration: %02X\n", reg_02.bits.arbitration);
|
|
}
|
|
|
|
/*
|
|
* Some Intel chipsets with IO APIC VERSION of 0x2? don't have reg_02
|
|
* or reg_03, but the value of reg_0[23] is read as the previous read
|
|
* register value, so ignore it if reg_03 == reg_0[12].
|
|
*/
|
|
if (reg_01.bits.version >= 0x20 && reg_03.raw != reg_02.raw &&
|
|
reg_03.raw != reg_01.raw) {
|
|
printk(KERN_DEBUG ".... register #03: %08X\n", reg_03.raw);
|
|
printk(KERN_DEBUG "....... : Boot DT : %X\n", reg_03.bits.boot_DT);
|
|
}
|
|
|
|
printk(KERN_DEBUG ".... IRQ redirection table:\n");
|
|
io_apic_print_entries(ioapic_idx, reg_01.bits.entries);
|
|
}
|
|
|
|
void __init print_IO_APICs(void)
|
|
{
|
|
int ioapic_idx;
|
|
unsigned int irq;
|
|
|
|
printk(KERN_DEBUG "number of MP IRQ sources: %d.\n", mp_irq_entries);
|
|
for_each_ioapic(ioapic_idx)
|
|
printk(KERN_DEBUG "number of IO-APIC #%d registers: %d.\n",
|
|
mpc_ioapic_id(ioapic_idx),
|
|
ioapics[ioapic_idx].nr_registers);
|
|
|
|
/*
|
|
* We are a bit conservative about what we expect. We have to
|
|
* know about every hardware change ASAP.
|
|
*/
|
|
printk(KERN_INFO "testing the IO APIC.......................\n");
|
|
|
|
for_each_ioapic(ioapic_idx)
|
|
print_IO_APIC(ioapic_idx);
|
|
|
|
printk(KERN_DEBUG "IRQ to pin mappings:\n");
|
|
for_each_active_irq(irq) {
|
|
struct irq_pin_list *entry;
|
|
struct irq_chip *chip;
|
|
struct mp_chip_data *data;
|
|
|
|
chip = irq_get_chip(irq);
|
|
if (chip != &ioapic_chip && chip != &ioapic_ir_chip)
|
|
continue;
|
|
data = irq_get_chip_data(irq);
|
|
if (!data)
|
|
continue;
|
|
if (list_empty(&data->irq_2_pin))
|
|
continue;
|
|
|
|
printk(KERN_DEBUG "IRQ%d ", irq);
|
|
for_each_irq_pin(entry, data->irq_2_pin)
|
|
pr_cont("-> %d:%d", entry->apic, entry->pin);
|
|
pr_cont("\n");
|
|
}
|
|
|
|
printk(KERN_INFO ".................................... done.\n");
|
|
}
|
|
|
|
/* Where if anywhere is the i8259 connect in external int mode */
|
|
static struct { int pin, apic; } ioapic_i8259 = { -1, -1 };
|
|
|
|
void __init enable_IO_APIC(void)
|
|
{
|
|
int i8259_apic, i8259_pin;
|
|
int apic, pin;
|
|
|
|
if (skip_ioapic_setup)
|
|
nr_ioapics = 0;
|
|
|
|
if (!nr_legacy_irqs() || !nr_ioapics)
|
|
return;
|
|
|
|
for_each_ioapic_pin(apic, pin) {
|
|
/* See if any of the pins is in ExtINT mode */
|
|
struct IO_APIC_route_entry entry = ioapic_read_entry(apic, pin);
|
|
|
|
/* If the interrupt line is enabled and in ExtInt mode
|
|
* I have found the pin where the i8259 is connected.
|
|
*/
|
|
if ((entry.mask == 0) && (entry.delivery_mode == dest_ExtINT)) {
|
|
ioapic_i8259.apic = apic;
|
|
ioapic_i8259.pin = pin;
|
|
goto found_i8259;
|
|
}
|
|
}
|
|
found_i8259:
|
|
/* Look to see what if the MP table has reported the ExtINT */
|
|
/* If we could not find the appropriate pin by looking at the ioapic
|
|
* the i8259 probably is not connected the ioapic but give the
|
|
* mptable a chance anyway.
|
|
*/
|
|
i8259_pin = find_isa_irq_pin(0, mp_ExtINT);
|
|
i8259_apic = find_isa_irq_apic(0, mp_ExtINT);
|
|
/* Trust the MP table if nothing is setup in the hardware */
|
|
if ((ioapic_i8259.pin == -1) && (i8259_pin >= 0)) {
|
|
printk(KERN_WARNING "ExtINT not setup in hardware but reported by MP table\n");
|
|
ioapic_i8259.pin = i8259_pin;
|
|
ioapic_i8259.apic = i8259_apic;
|
|
}
|
|
/* Complain if the MP table and the hardware disagree */
|
|
if (((ioapic_i8259.apic != i8259_apic) || (ioapic_i8259.pin != i8259_pin)) &&
|
|
(i8259_pin >= 0) && (ioapic_i8259.pin >= 0))
|
|
{
|
|
printk(KERN_WARNING "ExtINT in hardware and MP table differ\n");
|
|
}
|
|
|
|
/*
|
|
* Do not trust the IO-APIC being empty at bootup
|
|
*/
|
|
clear_IO_APIC();
|
|
}
|
|
|
|
void native_disable_io_apic(void)
|
|
{
|
|
/*
|
|
* If the i8259 is routed through an IOAPIC
|
|
* Put that IOAPIC in virtual wire mode
|
|
* so legacy interrupts can be delivered.
|
|
*/
|
|
if (ioapic_i8259.pin != -1) {
|
|
struct IO_APIC_route_entry entry;
|
|
|
|
memset(&entry, 0, sizeof(entry));
|
|
entry.mask = IOAPIC_UNMASKED;
|
|
entry.trigger = IOAPIC_EDGE;
|
|
entry.polarity = IOAPIC_POL_HIGH;
|
|
entry.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
|
|
entry.delivery_mode = dest_ExtINT;
|
|
entry.dest = read_apic_id();
|
|
|
|
/*
|
|
* Add it to the IO-APIC irq-routing table:
|
|
*/
|
|
ioapic_write_entry(ioapic_i8259.apic, ioapic_i8259.pin, entry);
|
|
}
|
|
|
|
if (boot_cpu_has(X86_FEATURE_APIC) || apic_from_smp_config())
|
|
disconnect_bsp_APIC(ioapic_i8259.pin != -1);
|
|
}
|
|
|
|
/*
|
|
* Not an __init, needed by the reboot code
|
|
*/
|
|
void disable_IO_APIC(void)
|
|
{
|
|
/*
|
|
* Clear the IO-APIC before rebooting:
|
|
*/
|
|
clear_IO_APIC();
|
|
|
|
if (!nr_legacy_irqs())
|
|
return;
|
|
|
|
x86_io_apic_ops.disable();
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/*
|
|
* function to set the IO-APIC physical IDs based on the
|
|
* values stored in the MPC table.
|
|
*
|
|
* by Matt Domsch <Matt_Domsch@dell.com> Tue Dec 21 12:25:05 CST 1999
|
|
*/
|
|
void __init setup_ioapic_ids_from_mpc_nocheck(void)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
physid_mask_t phys_id_present_map;
|
|
int ioapic_idx;
|
|
int i;
|
|
unsigned char old_id;
|
|
unsigned long flags;
|
|
|
|
/*
|
|
* This is broken; anything with a real cpu count has to
|
|
* circumvent this idiocy regardless.
|
|
*/
|
|
apic->ioapic_phys_id_map(&phys_cpu_present_map, &phys_id_present_map);
|
|
|
|
/*
|
|
* Set the IOAPIC ID to the value stored in the MPC table.
|
|
*/
|
|
for_each_ioapic(ioapic_idx) {
|
|
/* Read the register 0 value */
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(ioapic_idx, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
old_id = mpc_ioapic_id(ioapic_idx);
|
|
|
|
if (mpc_ioapic_id(ioapic_idx) >= get_physical_broadcast()) {
|
|
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID is %d in the MPC table!...\n",
|
|
ioapic_idx, mpc_ioapic_id(ioapic_idx));
|
|
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
|
|
reg_00.bits.ID);
|
|
ioapics[ioapic_idx].mp_config.apicid = reg_00.bits.ID;
|
|
}
|
|
|
|
/*
|
|
* Sanity check, is the ID really free? Every APIC in a
|
|
* system must have a unique ID or we get lots of nice
|
|
* 'stuck on smp_invalidate_needed IPI wait' messages.
|
|
*/
|
|
if (apic->check_apicid_used(&phys_id_present_map,
|
|
mpc_ioapic_id(ioapic_idx))) {
|
|
printk(KERN_ERR "BIOS bug, IO-APIC#%d ID %d is already used!...\n",
|
|
ioapic_idx, mpc_ioapic_id(ioapic_idx));
|
|
for (i = 0; i < get_physical_broadcast(); i++)
|
|
if (!physid_isset(i, phys_id_present_map))
|
|
break;
|
|
if (i >= get_physical_broadcast())
|
|
panic("Max APIC ID exceeded!\n");
|
|
printk(KERN_ERR "... fixing up to %d. (tell your hw vendor)\n",
|
|
i);
|
|
physid_set(i, phys_id_present_map);
|
|
ioapics[ioapic_idx].mp_config.apicid = i;
|
|
} else {
|
|
physid_mask_t tmp;
|
|
apic->apicid_to_cpu_present(mpc_ioapic_id(ioapic_idx),
|
|
&tmp);
|
|
apic_printk(APIC_VERBOSE, "Setting %d in the "
|
|
"phys_id_present_map\n",
|
|
mpc_ioapic_id(ioapic_idx));
|
|
physids_or(phys_id_present_map, phys_id_present_map, tmp);
|
|
}
|
|
|
|
/*
|
|
* We need to adjust the IRQ routing table
|
|
* if the ID changed.
|
|
*/
|
|
if (old_id != mpc_ioapic_id(ioapic_idx))
|
|
for (i = 0; i < mp_irq_entries; i++)
|
|
if (mp_irqs[i].dstapic == old_id)
|
|
mp_irqs[i].dstapic
|
|
= mpc_ioapic_id(ioapic_idx);
|
|
|
|
/*
|
|
* Update the ID register according to the right value
|
|
* from the MPC table if they are different.
|
|
*/
|
|
if (mpc_ioapic_id(ioapic_idx) == reg_00.bits.ID)
|
|
continue;
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"...changing IO-APIC physical APIC ID to %d ...",
|
|
mpc_ioapic_id(ioapic_idx));
|
|
|
|
reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(ioapic_idx, 0, reg_00.raw);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
/*
|
|
* Sanity check
|
|
*/
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(ioapic_idx, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx))
|
|
pr_cont("could not set ID!\n");
|
|
else
|
|
apic_printk(APIC_VERBOSE, " ok.\n");
|
|
}
|
|
}
|
|
|
|
void __init setup_ioapic_ids_from_mpc(void)
|
|
{
|
|
|
|
if (acpi_ioapic)
|
|
return;
|
|
/*
|
|
* Don't check I/O APIC IDs for xAPIC systems. They have
|
|
* no meaning without the serial APIC bus.
|
|
*/
|
|
if (!(boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
|
|
|| APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
|
|
return;
|
|
setup_ioapic_ids_from_mpc_nocheck();
|
|
}
|
|
#endif
|
|
|
|
int no_timer_check __initdata;
|
|
|
|
static int __init notimercheck(char *s)
|
|
{
|
|
no_timer_check = 1;
|
|
return 1;
|
|
}
|
|
__setup("no_timer_check", notimercheck);
|
|
|
|
/*
|
|
* There is a nasty bug in some older SMP boards, their mptable lies
|
|
* about the timer IRQ. We do the following to work around the situation:
|
|
*
|
|
* - timer IRQ defaults to IO-APIC IRQ
|
|
* - if this function detects that timer IRQs are defunct, then we fall
|
|
* back to ISA timer IRQs
|
|
*/
|
|
static int __init timer_irq_works(void)
|
|
{
|
|
unsigned long t1 = jiffies;
|
|
unsigned long flags;
|
|
|
|
if (no_timer_check)
|
|
return 1;
|
|
|
|
local_save_flags(flags);
|
|
local_irq_enable();
|
|
/* Let ten ticks pass... */
|
|
mdelay((10 * 1000) / HZ);
|
|
local_irq_restore(flags);
|
|
|
|
/*
|
|
* Expect a few ticks at least, to be sure some possible
|
|
* glue logic does not lock up after one or two first
|
|
* ticks in a non-ExtINT mode. Also the local APIC
|
|
* might have cached one ExtINT interrupt. Finally, at
|
|
* least one tick may be lost due to delays.
|
|
*/
|
|
|
|
/* jiffies wrap? */
|
|
if (time_after(jiffies, t1 + 4))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* In the SMP+IOAPIC case it might happen that there are an unspecified
|
|
* number of pending IRQ events unhandled. These cases are very rare,
|
|
* so we 'resend' these IRQs via IPIs, to the same CPU. It's much
|
|
* better to do it this way as thus we do not have to be aware of
|
|
* 'pending' interrupts in the IRQ path, except at this point.
|
|
*/
|
|
/*
|
|
* Edge triggered needs to resend any interrupt
|
|
* that was delayed but this is now handled in the device
|
|
* independent code.
|
|
*/
|
|
|
|
/*
|
|
* Starting up a edge-triggered IO-APIC interrupt is
|
|
* nasty - we need to make sure that we get the edge.
|
|
* If it is already asserted for some reason, we need
|
|
* return 1 to indicate that is was pending.
|
|
*
|
|
* This is not complete - we should be able to fake
|
|
* an edge even if it isn't on the 8259A...
|
|
*/
|
|
static unsigned int startup_ioapic_irq(struct irq_data *data)
|
|
{
|
|
int was_pending = 0, irq = data->irq;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
if (irq < nr_legacy_irqs()) {
|
|
legacy_pic->mask(irq);
|
|
if (legacy_pic->irq_pending(irq))
|
|
was_pending = 1;
|
|
}
|
|
__unmask_ioapic(data->chip_data);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return was_pending;
|
|
}
|
|
|
|
atomic_t irq_mis_count;
|
|
|
|
#ifdef CONFIG_GENERIC_PENDING_IRQ
|
|
static bool io_apic_level_ack_pending(struct mp_chip_data *data)
|
|
{
|
|
struct irq_pin_list *entry;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
for_each_irq_pin(entry, data->irq_2_pin) {
|
|
unsigned int reg;
|
|
int pin;
|
|
|
|
pin = entry->pin;
|
|
reg = io_apic_read(entry->apic, 0x10 + pin*2);
|
|
/* Is the remote IRR bit set? */
|
|
if (reg & IO_APIC_REDIR_REMOTE_IRR) {
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
return true;
|
|
}
|
|
}
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline bool ioapic_irqd_mask(struct irq_data *data)
|
|
{
|
|
/* If we are moving the irq we need to mask it */
|
|
if (unlikely(irqd_is_setaffinity_pending(data))) {
|
|
mask_ioapic_irq(data);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
|
|
{
|
|
if (unlikely(masked)) {
|
|
/* Only migrate the irq if the ack has been received.
|
|
*
|
|
* On rare occasions the broadcast level triggered ack gets
|
|
* delayed going to ioapics, and if we reprogram the
|
|
* vector while Remote IRR is still set the irq will never
|
|
* fire again.
|
|
*
|
|
* To prevent this scenario we read the Remote IRR bit
|
|
* of the ioapic. This has two effects.
|
|
* - On any sane system the read of the ioapic will
|
|
* flush writes (and acks) going to the ioapic from
|
|
* this cpu.
|
|
* - We get to see if the ACK has actually been delivered.
|
|
*
|
|
* Based on failed experiments of reprogramming the
|
|
* ioapic entry from outside of irq context starting
|
|
* with masking the ioapic entry and then polling until
|
|
* Remote IRR was clear before reprogramming the
|
|
* ioapic I don't trust the Remote IRR bit to be
|
|
* completey accurate.
|
|
*
|
|
* However there appears to be no other way to plug
|
|
* this race, so if the Remote IRR bit is not
|
|
* accurate and is causing problems then it is a hardware bug
|
|
* and you can go talk to the chipset vendor about it.
|
|
*/
|
|
if (!io_apic_level_ack_pending(data->chip_data))
|
|
irq_move_masked_irq(data);
|
|
unmask_ioapic_irq(data);
|
|
}
|
|
}
|
|
#else
|
|
static inline bool ioapic_irqd_mask(struct irq_data *data)
|
|
{
|
|
return false;
|
|
}
|
|
static inline void ioapic_irqd_unmask(struct irq_data *data, bool masked)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static void ioapic_ack_level(struct irq_data *irq_data)
|
|
{
|
|
struct irq_cfg *cfg = irqd_cfg(irq_data);
|
|
unsigned long v;
|
|
bool masked;
|
|
int i;
|
|
|
|
irq_complete_move(cfg);
|
|
masked = ioapic_irqd_mask(irq_data);
|
|
|
|
/*
|
|
* It appears there is an erratum which affects at least version 0x11
|
|
* of I/O APIC (that's the 82093AA and cores integrated into various
|
|
* chipsets). Under certain conditions a level-triggered interrupt is
|
|
* erroneously delivered as edge-triggered one but the respective IRR
|
|
* bit gets set nevertheless. As a result the I/O unit expects an EOI
|
|
* message but it will never arrive and further interrupts are blocked
|
|
* from the source. The exact reason is so far unknown, but the
|
|
* phenomenon was observed when two consecutive interrupt requests
|
|
* from a given source get delivered to the same CPU and the source is
|
|
* temporarily disabled in between.
|
|
*
|
|
* A workaround is to simulate an EOI message manually. We achieve it
|
|
* by setting the trigger mode to edge and then to level when the edge
|
|
* trigger mode gets detected in the TMR of a local APIC for a
|
|
* level-triggered interrupt. We mask the source for the time of the
|
|
* operation to prevent an edge-triggered interrupt escaping meanwhile.
|
|
* The idea is from Manfred Spraul. --macro
|
|
*
|
|
* Also in the case when cpu goes offline, fixup_irqs() will forward
|
|
* any unhandled interrupt on the offlined cpu to the new cpu
|
|
* destination that is handling the corresponding interrupt. This
|
|
* interrupt forwarding is done via IPI's. Hence, in this case also
|
|
* level-triggered io-apic interrupt will be seen as an edge
|
|
* interrupt in the IRR. And we can't rely on the cpu's EOI
|
|
* to be broadcasted to the IO-APIC's which will clear the remoteIRR
|
|
* corresponding to the level-triggered interrupt. Hence on IO-APIC's
|
|
* supporting EOI register, we do an explicit EOI to clear the
|
|
* remote IRR and on IO-APIC's which don't have an EOI register,
|
|
* we use the above logic (mask+edge followed by unmask+level) from
|
|
* Manfred Spraul to clear the remote IRR.
|
|
*/
|
|
i = cfg->vector;
|
|
v = apic_read(APIC_TMR + ((i & ~0x1f) >> 1));
|
|
|
|
/*
|
|
* We must acknowledge the irq before we move it or the acknowledge will
|
|
* not propagate properly.
|
|
*/
|
|
ack_APIC_irq();
|
|
|
|
/*
|
|
* Tail end of clearing remote IRR bit (either by delivering the EOI
|
|
* message via io-apic EOI register write or simulating it using
|
|
* mask+edge followed by unnask+level logic) manually when the
|
|
* level triggered interrupt is seen as the edge triggered interrupt
|
|
* at the cpu.
|
|
*/
|
|
if (!(v & (1 << (i & 0x1f)))) {
|
|
atomic_inc(&irq_mis_count);
|
|
eoi_ioapic_pin(cfg->vector, irq_data->chip_data);
|
|
}
|
|
|
|
ioapic_irqd_unmask(irq_data, masked);
|
|
}
|
|
|
|
static void ioapic_ir_ack_level(struct irq_data *irq_data)
|
|
{
|
|
struct mp_chip_data *data = irq_data->chip_data;
|
|
|
|
/*
|
|
* Intr-remapping uses pin number as the virtual vector
|
|
* in the RTE. Actual vector is programmed in
|
|
* intr-remapping table entry. Hence for the io-apic
|
|
* EOI we use the pin number.
|
|
*/
|
|
ack_APIC_irq();
|
|
eoi_ioapic_pin(data->entry.vector, data);
|
|
}
|
|
|
|
static int ioapic_set_affinity(struct irq_data *irq_data,
|
|
const struct cpumask *mask, bool force)
|
|
{
|
|
struct irq_data *parent = irq_data->parent_data;
|
|
struct mp_chip_data *data = irq_data->chip_data;
|
|
struct irq_pin_list *entry;
|
|
struct irq_cfg *cfg;
|
|
unsigned long flags;
|
|
int ret;
|
|
|
|
ret = parent->chip->irq_set_affinity(parent, mask, force);
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
if (ret >= 0 && ret != IRQ_SET_MASK_OK_DONE) {
|
|
cfg = irqd_cfg(irq_data);
|
|
data->entry.dest = cfg->dest_apicid;
|
|
data->entry.vector = cfg->vector;
|
|
for_each_irq_pin(entry, data->irq_2_pin)
|
|
__ioapic_write_entry(entry->apic, entry->pin,
|
|
data->entry);
|
|
}
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct irq_chip ioapic_chip __read_mostly = {
|
|
.name = "IO-APIC",
|
|
.irq_startup = startup_ioapic_irq,
|
|
.irq_mask = mask_ioapic_irq,
|
|
.irq_unmask = unmask_ioapic_irq,
|
|
.irq_ack = irq_chip_ack_parent,
|
|
.irq_eoi = ioapic_ack_level,
|
|
.irq_set_affinity = ioapic_set_affinity,
|
|
.flags = IRQCHIP_SKIP_SET_WAKE,
|
|
};
|
|
|
|
static struct irq_chip ioapic_ir_chip __read_mostly = {
|
|
.name = "IR-IO-APIC",
|
|
.irq_startup = startup_ioapic_irq,
|
|
.irq_mask = mask_ioapic_irq,
|
|
.irq_unmask = unmask_ioapic_irq,
|
|
.irq_ack = irq_chip_ack_parent,
|
|
.irq_eoi = ioapic_ir_ack_level,
|
|
.irq_set_affinity = ioapic_set_affinity,
|
|
.flags = IRQCHIP_SKIP_SET_WAKE,
|
|
};
|
|
|
|
static inline void init_IO_APIC_traps(void)
|
|
{
|
|
struct irq_cfg *cfg;
|
|
unsigned int irq;
|
|
|
|
for_each_active_irq(irq) {
|
|
cfg = irq_cfg(irq);
|
|
if (IO_APIC_IRQ(irq) && cfg && !cfg->vector) {
|
|
/*
|
|
* Hmm.. We don't have an entry for this,
|
|
* so default to an old-fashioned 8259
|
|
* interrupt if we can..
|
|
*/
|
|
if (irq < nr_legacy_irqs())
|
|
legacy_pic->make_irq(irq);
|
|
else
|
|
/* Strange. Oh, well.. */
|
|
irq_set_chip(irq, &no_irq_chip);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The local APIC irq-chip implementation:
|
|
*/
|
|
|
|
static void mask_lapic_irq(struct irq_data *data)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = apic_read(APIC_LVT0);
|
|
apic_write(APIC_LVT0, v | APIC_LVT_MASKED);
|
|
}
|
|
|
|
static void unmask_lapic_irq(struct irq_data *data)
|
|
{
|
|
unsigned long v;
|
|
|
|
v = apic_read(APIC_LVT0);
|
|
apic_write(APIC_LVT0, v & ~APIC_LVT_MASKED);
|
|
}
|
|
|
|
static void ack_lapic_irq(struct irq_data *data)
|
|
{
|
|
ack_APIC_irq();
|
|
}
|
|
|
|
static struct irq_chip lapic_chip __read_mostly = {
|
|
.name = "local-APIC",
|
|
.irq_mask = mask_lapic_irq,
|
|
.irq_unmask = unmask_lapic_irq,
|
|
.irq_ack = ack_lapic_irq,
|
|
};
|
|
|
|
static void lapic_register_intr(int irq)
|
|
{
|
|
irq_clear_status_flags(irq, IRQ_LEVEL);
|
|
irq_set_chip_and_handler_name(irq, &lapic_chip, handle_edge_irq,
|
|
"edge");
|
|
}
|
|
|
|
/*
|
|
* This looks a bit hackish but it's about the only one way of sending
|
|
* a few INTA cycles to 8259As and any associated glue logic. ICR does
|
|
* not support the ExtINT mode, unfortunately. We need to send these
|
|
* cycles as some i82489DX-based boards have glue logic that keeps the
|
|
* 8259A interrupt line asserted until INTA. --macro
|
|
*/
|
|
static inline void __init unlock_ExtINT_logic(void)
|
|
{
|
|
int apic, pin, i;
|
|
struct IO_APIC_route_entry entry0, entry1;
|
|
unsigned char save_control, save_freq_select;
|
|
|
|
pin = find_isa_irq_pin(8, mp_INT);
|
|
if (pin == -1) {
|
|
WARN_ON_ONCE(1);
|
|
return;
|
|
}
|
|
apic = find_isa_irq_apic(8, mp_INT);
|
|
if (apic == -1) {
|
|
WARN_ON_ONCE(1);
|
|
return;
|
|
}
|
|
|
|
entry0 = ioapic_read_entry(apic, pin);
|
|
clear_IO_APIC_pin(apic, pin);
|
|
|
|
memset(&entry1, 0, sizeof(entry1));
|
|
|
|
entry1.dest_mode = IOAPIC_DEST_MODE_PHYSICAL;
|
|
entry1.mask = IOAPIC_UNMASKED;
|
|
entry1.dest = hard_smp_processor_id();
|
|
entry1.delivery_mode = dest_ExtINT;
|
|
entry1.polarity = entry0.polarity;
|
|
entry1.trigger = IOAPIC_EDGE;
|
|
entry1.vector = 0;
|
|
|
|
ioapic_write_entry(apic, pin, entry1);
|
|
|
|
save_control = CMOS_READ(RTC_CONTROL);
|
|
save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
|
|
CMOS_WRITE((save_freq_select & ~RTC_RATE_SELECT) | 0x6,
|
|
RTC_FREQ_SELECT);
|
|
CMOS_WRITE(save_control | RTC_PIE, RTC_CONTROL);
|
|
|
|
i = 100;
|
|
while (i-- > 0) {
|
|
mdelay(10);
|
|
if ((CMOS_READ(RTC_INTR_FLAGS) & RTC_PF) == RTC_PF)
|
|
i -= 10;
|
|
}
|
|
|
|
CMOS_WRITE(save_control, RTC_CONTROL);
|
|
CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
|
|
clear_IO_APIC_pin(apic, pin);
|
|
|
|
ioapic_write_entry(apic, pin, entry0);
|
|
}
|
|
|
|
static int disable_timer_pin_1 __initdata;
|
|
/* Actually the next is obsolete, but keep it for paranoid reasons -AK */
|
|
static int __init disable_timer_pin_setup(char *arg)
|
|
{
|
|
disable_timer_pin_1 = 1;
|
|
return 0;
|
|
}
|
|
early_param("disable_timer_pin_1", disable_timer_pin_setup);
|
|
|
|
static int mp_alloc_timer_irq(int ioapic, int pin)
|
|
{
|
|
int irq = -1;
|
|
struct irq_domain *domain = mp_ioapic_irqdomain(ioapic);
|
|
|
|
if (domain) {
|
|
struct irq_alloc_info info;
|
|
|
|
ioapic_set_alloc_attr(&info, NUMA_NO_NODE, 0, 0);
|
|
info.ioapic_id = mpc_ioapic_id(ioapic);
|
|
info.ioapic_pin = pin;
|
|
mutex_lock(&ioapic_mutex);
|
|
irq = alloc_isa_irq_from_domain(domain, 0, ioapic, pin, &info);
|
|
mutex_unlock(&ioapic_mutex);
|
|
}
|
|
|
|
return irq;
|
|
}
|
|
|
|
/*
|
|
* This code may look a bit paranoid, but it's supposed to cooperate with
|
|
* a wide range of boards and BIOS bugs. Fortunately only the timer IRQ
|
|
* is so screwy. Thanks to Brian Perkins for testing/hacking this beast
|
|
* fanatically on his truly buggy board.
|
|
*
|
|
* FIXME: really need to revamp this for all platforms.
|
|
*/
|
|
static inline void __init check_timer(void)
|
|
{
|
|
struct irq_data *irq_data = irq_get_irq_data(0);
|
|
struct mp_chip_data *data = irq_data->chip_data;
|
|
struct irq_cfg *cfg = irqd_cfg(irq_data);
|
|
int node = cpu_to_node(0);
|
|
int apic1, pin1, apic2, pin2;
|
|
unsigned long flags;
|
|
int no_pin1 = 0;
|
|
|
|
local_irq_save(flags);
|
|
|
|
/*
|
|
* get/set the timer IRQ vector:
|
|
*/
|
|
legacy_pic->mask(0);
|
|
|
|
/*
|
|
* As IRQ0 is to be enabled in the 8259A, the virtual
|
|
* wire has to be disabled in the local APIC. Also
|
|
* timer interrupts need to be acknowledged manually in
|
|
* the 8259A for the i82489DX when using the NMI
|
|
* watchdog as that APIC treats NMIs as level-triggered.
|
|
* The AEOI mode will finish them in the 8259A
|
|
* automatically.
|
|
*/
|
|
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_EXTINT);
|
|
legacy_pic->init(1);
|
|
|
|
pin1 = find_isa_irq_pin(0, mp_INT);
|
|
apic1 = find_isa_irq_apic(0, mp_INT);
|
|
pin2 = ioapic_i8259.pin;
|
|
apic2 = ioapic_i8259.apic;
|
|
|
|
apic_printk(APIC_QUIET, KERN_INFO "..TIMER: vector=0x%02X "
|
|
"apic1=%d pin1=%d apic2=%d pin2=%d\n",
|
|
cfg->vector, apic1, pin1, apic2, pin2);
|
|
|
|
/*
|
|
* Some BIOS writers are clueless and report the ExtINTA
|
|
* I/O APIC input from the cascaded 8259A as the timer
|
|
* interrupt input. So just in case, if only one pin
|
|
* was found above, try it both directly and through the
|
|
* 8259A.
|
|
*/
|
|
if (pin1 == -1) {
|
|
panic_if_irq_remap("BIOS bug: timer not connected to IO-APIC");
|
|
pin1 = pin2;
|
|
apic1 = apic2;
|
|
no_pin1 = 1;
|
|
} else if (pin2 == -1) {
|
|
pin2 = pin1;
|
|
apic2 = apic1;
|
|
}
|
|
|
|
if (pin1 != -1) {
|
|
/* Ok, does IRQ0 through the IOAPIC work? */
|
|
if (no_pin1) {
|
|
mp_alloc_timer_irq(apic1, pin1);
|
|
} else {
|
|
/*
|
|
* for edge trigger, it's already unmasked,
|
|
* so only need to unmask if it is level-trigger
|
|
* do we really have level trigger timer?
|
|
*/
|
|
int idx;
|
|
idx = find_irq_entry(apic1, pin1, mp_INT);
|
|
if (idx != -1 && irq_trigger(idx))
|
|
unmask_ioapic_irq(irq_get_chip_data(0));
|
|
}
|
|
irq_domain_activate_irq(irq_data);
|
|
if (timer_irq_works()) {
|
|
if (disable_timer_pin_1 > 0)
|
|
clear_IO_APIC_pin(0, pin1);
|
|
goto out;
|
|
}
|
|
panic_if_irq_remap("timer doesn't work through Interrupt-remapped IO-APIC");
|
|
local_irq_disable();
|
|
clear_IO_APIC_pin(apic1, pin1);
|
|
if (!no_pin1)
|
|
apic_printk(APIC_QUIET, KERN_ERR "..MP-BIOS bug: "
|
|
"8254 timer not connected to IO-APIC\n");
|
|
|
|
apic_printk(APIC_QUIET, KERN_INFO "...trying to set up timer "
|
|
"(IRQ0) through the 8259A ...\n");
|
|
apic_printk(APIC_QUIET, KERN_INFO
|
|
"..... (found apic %d pin %d) ...\n", apic2, pin2);
|
|
/*
|
|
* legacy devices should be connected to IO APIC #0
|
|
*/
|
|
replace_pin_at_irq_node(data, node, apic1, pin1, apic2, pin2);
|
|
irq_domain_activate_irq(irq_data);
|
|
legacy_pic->unmask(0);
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_QUIET, KERN_INFO "....... works.\n");
|
|
goto out;
|
|
}
|
|
/*
|
|
* Cleanup, just in case ...
|
|
*/
|
|
local_irq_disable();
|
|
legacy_pic->mask(0);
|
|
clear_IO_APIC_pin(apic2, pin2);
|
|
apic_printk(APIC_QUIET, KERN_INFO "....... failed.\n");
|
|
}
|
|
|
|
apic_printk(APIC_QUIET, KERN_INFO
|
|
"...trying to set up timer as Virtual Wire IRQ...\n");
|
|
|
|
lapic_register_intr(0);
|
|
apic_write(APIC_LVT0, APIC_DM_FIXED | cfg->vector); /* Fixed mode */
|
|
legacy_pic->unmask(0);
|
|
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
|
|
goto out;
|
|
}
|
|
local_irq_disable();
|
|
legacy_pic->mask(0);
|
|
apic_write(APIC_LVT0, APIC_LVT_MASKED | APIC_DM_FIXED | cfg->vector);
|
|
apic_printk(APIC_QUIET, KERN_INFO "..... failed.\n");
|
|
|
|
apic_printk(APIC_QUIET, KERN_INFO
|
|
"...trying to set up timer as ExtINT IRQ...\n");
|
|
|
|
legacy_pic->init(0);
|
|
legacy_pic->make_irq(0);
|
|
apic_write(APIC_LVT0, APIC_DM_EXTINT);
|
|
|
|
unlock_ExtINT_logic();
|
|
|
|
if (timer_irq_works()) {
|
|
apic_printk(APIC_QUIET, KERN_INFO "..... works.\n");
|
|
goto out;
|
|
}
|
|
local_irq_disable();
|
|
apic_printk(APIC_QUIET, KERN_INFO "..... failed :(.\n");
|
|
if (apic_is_x2apic_enabled())
|
|
apic_printk(APIC_QUIET, KERN_INFO
|
|
"Perhaps problem with the pre-enabled x2apic mode\n"
|
|
"Try booting with x2apic and interrupt-remapping disabled in the bios.\n");
|
|
panic("IO-APIC + timer doesn't work! Boot with apic=debug and send a "
|
|
"report. Then try booting with the 'noapic' option.\n");
|
|
out:
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/*
|
|
* Traditionally ISA IRQ2 is the cascade IRQ, and is not available
|
|
* to devices. However there may be an I/O APIC pin available for
|
|
* this interrupt regardless. The pin may be left unconnected, but
|
|
* typically it will be reused as an ExtINT cascade interrupt for
|
|
* the master 8259A. In the MPS case such a pin will normally be
|
|
* reported as an ExtINT interrupt in the MP table. With ACPI
|
|
* there is no provision for ExtINT interrupts, and in the absence
|
|
* of an override it would be treated as an ordinary ISA I/O APIC
|
|
* interrupt, that is edge-triggered and unmasked by default. We
|
|
* used to do this, but it caused problems on some systems because
|
|
* of the NMI watchdog and sometimes IRQ0 of the 8254 timer using
|
|
* the same ExtINT cascade interrupt to drive the local APIC of the
|
|
* bootstrap processor. Therefore we refrain from routing IRQ2 to
|
|
* the I/O APIC in all cases now. No actual device should request
|
|
* it anyway. --macro
|
|
*/
|
|
#define PIC_IRQS (1UL << PIC_CASCADE_IR)
|
|
|
|
static int mp_irqdomain_create(int ioapic)
|
|
{
|
|
struct irq_alloc_info info;
|
|
struct irq_domain *parent;
|
|
int hwirqs = mp_ioapic_pin_count(ioapic);
|
|
struct ioapic *ip = &ioapics[ioapic];
|
|
struct ioapic_domain_cfg *cfg = &ip->irqdomain_cfg;
|
|
struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(ioapic);
|
|
|
|
if (cfg->type == IOAPIC_DOMAIN_INVALID)
|
|
return 0;
|
|
|
|
init_irq_alloc_info(&info, NULL);
|
|
info.type = X86_IRQ_ALLOC_TYPE_IOAPIC;
|
|
info.ioapic_id = mpc_ioapic_id(ioapic);
|
|
parent = irq_remapping_get_ir_irq_domain(&info);
|
|
if (!parent)
|
|
parent = x86_vector_domain;
|
|
|
|
ip->irqdomain = irq_domain_add_linear(cfg->dev, hwirqs, cfg->ops,
|
|
(void *)(long)ioapic);
|
|
if (!ip->irqdomain)
|
|
return -ENOMEM;
|
|
|
|
ip->irqdomain->parent = parent;
|
|
|
|
if (cfg->type == IOAPIC_DOMAIN_LEGACY ||
|
|
cfg->type == IOAPIC_DOMAIN_STRICT)
|
|
ioapic_dynirq_base = max(ioapic_dynirq_base,
|
|
gsi_cfg->gsi_end + 1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ioapic_destroy_irqdomain(int idx)
|
|
{
|
|
if (ioapics[idx].irqdomain) {
|
|
irq_domain_remove(ioapics[idx].irqdomain);
|
|
ioapics[idx].irqdomain = NULL;
|
|
}
|
|
}
|
|
|
|
void __init setup_IO_APIC(void)
|
|
{
|
|
int ioapic;
|
|
|
|
if (skip_ioapic_setup || !nr_ioapics)
|
|
return;
|
|
|
|
io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL;
|
|
|
|
apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n");
|
|
for_each_ioapic(ioapic)
|
|
BUG_ON(mp_irqdomain_create(ioapic));
|
|
|
|
/*
|
|
* Set up IO-APIC IRQ routing.
|
|
*/
|
|
x86_init.mpparse.setup_ioapic_ids();
|
|
|
|
sync_Arb_IDs();
|
|
setup_IO_APIC_irqs();
|
|
init_IO_APIC_traps();
|
|
if (nr_legacy_irqs())
|
|
check_timer();
|
|
|
|
ioapic_initialized = 1;
|
|
}
|
|
|
|
static void resume_ioapic_id(int ioapic_idx)
|
|
{
|
|
unsigned long flags;
|
|
union IO_APIC_reg_00 reg_00;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(ioapic_idx, 0);
|
|
if (reg_00.bits.ID != mpc_ioapic_id(ioapic_idx)) {
|
|
reg_00.bits.ID = mpc_ioapic_id(ioapic_idx);
|
|
io_apic_write(ioapic_idx, 0, reg_00.raw);
|
|
}
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
static void ioapic_resume(void)
|
|
{
|
|
int ioapic_idx;
|
|
|
|
for_each_ioapic_reverse(ioapic_idx)
|
|
resume_ioapic_id(ioapic_idx);
|
|
|
|
restore_ioapic_entries();
|
|
}
|
|
|
|
static struct syscore_ops ioapic_syscore_ops = {
|
|
.suspend = save_ioapic_entries,
|
|
.resume = ioapic_resume,
|
|
};
|
|
|
|
static int __init ioapic_init_ops(void)
|
|
{
|
|
register_syscore_ops(&ioapic_syscore_ops);
|
|
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(ioapic_init_ops);
|
|
|
|
static int io_apic_get_redir_entries(int ioapic)
|
|
{
|
|
union IO_APIC_reg_01 reg_01;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_01.raw = io_apic_read(ioapic, 1);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
/* The register returns the maximum index redir index
|
|
* supported, which is one less than the total number of redir
|
|
* entries.
|
|
*/
|
|
return reg_01.bits.entries + 1;
|
|
}
|
|
|
|
unsigned int arch_dynirq_lower_bound(unsigned int from)
|
|
{
|
|
/*
|
|
* dmar_alloc_hwirq() may be called before setup_IO_APIC(), so use
|
|
* gsi_top if ioapic_dynirq_base hasn't been initialized yet.
|
|
*/
|
|
return ioapic_initialized ? ioapic_dynirq_base : gsi_top;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
static int io_apic_get_unique_id(int ioapic, int apic_id)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
static physid_mask_t apic_id_map = PHYSID_MASK_NONE;
|
|
physid_mask_t tmp;
|
|
unsigned long flags;
|
|
int i = 0;
|
|
|
|
/*
|
|
* The P4 platform supports up to 256 APIC IDs on two separate APIC
|
|
* buses (one for LAPICs, one for IOAPICs), where predecessors only
|
|
* supports up to 16 on one shared APIC bus.
|
|
*
|
|
* TBD: Expand LAPIC/IOAPIC support on P4-class systems to take full
|
|
* advantage of new APIC bus architecture.
|
|
*/
|
|
|
|
if (physids_empty(apic_id_map))
|
|
apic->ioapic_phys_id_map(&phys_cpu_present_map, &apic_id_map);
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(ioapic, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
if (apic_id >= get_physical_broadcast()) {
|
|
printk(KERN_WARNING "IOAPIC[%d]: Invalid apic_id %d, trying "
|
|
"%d\n", ioapic, apic_id, reg_00.bits.ID);
|
|
apic_id = reg_00.bits.ID;
|
|
}
|
|
|
|
/*
|
|
* Every APIC in a system must have a unique ID or we get lots of nice
|
|
* 'stuck on smp_invalidate_needed IPI wait' messages.
|
|
*/
|
|
if (apic->check_apicid_used(&apic_id_map, apic_id)) {
|
|
|
|
for (i = 0; i < get_physical_broadcast(); i++) {
|
|
if (!apic->check_apicid_used(&apic_id_map, i))
|
|
break;
|
|
}
|
|
|
|
if (i == get_physical_broadcast())
|
|
panic("Max apic_id exceeded!\n");
|
|
|
|
printk(KERN_WARNING "IOAPIC[%d]: apic_id %d already used, "
|
|
"trying %d\n", ioapic, apic_id, i);
|
|
|
|
apic_id = i;
|
|
}
|
|
|
|
apic->apicid_to_cpu_present(apic_id, &tmp);
|
|
physids_or(apic_id_map, apic_id_map, tmp);
|
|
|
|
if (reg_00.bits.ID != apic_id) {
|
|
reg_00.bits.ID = apic_id;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(ioapic, 0, reg_00.raw);
|
|
reg_00.raw = io_apic_read(ioapic, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
/* Sanity check */
|
|
if (reg_00.bits.ID != apic_id) {
|
|
pr_err("IOAPIC[%d]: Unable to change apic_id!\n",
|
|
ioapic);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"IOAPIC[%d]: Assigned apic_id %d\n", ioapic, apic_id);
|
|
|
|
return apic_id;
|
|
}
|
|
|
|
static u8 io_apic_unique_id(int idx, u8 id)
|
|
{
|
|
if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) &&
|
|
!APIC_XAPIC(apic_version[boot_cpu_physical_apicid]))
|
|
return io_apic_get_unique_id(idx, id);
|
|
else
|
|
return id;
|
|
}
|
|
#else
|
|
static u8 io_apic_unique_id(int idx, u8 id)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
DECLARE_BITMAP(used, 256);
|
|
unsigned long flags;
|
|
u8 new_id;
|
|
int i;
|
|
|
|
bitmap_zero(used, 256);
|
|
for_each_ioapic(i)
|
|
__set_bit(mpc_ioapic_id(i), used);
|
|
|
|
/* Hand out the requested id if available */
|
|
if (!test_bit(id, used))
|
|
return id;
|
|
|
|
/*
|
|
* Read the current id from the ioapic and keep it if
|
|
* available.
|
|
*/
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_00.raw = io_apic_read(idx, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
new_id = reg_00.bits.ID;
|
|
if (!test_bit(new_id, used)) {
|
|
apic_printk(APIC_VERBOSE, KERN_INFO
|
|
"IOAPIC[%d]: Using reg apic_id %d instead of %d\n",
|
|
idx, new_id, id);
|
|
return new_id;
|
|
}
|
|
|
|
/*
|
|
* Get the next free id and write it to the ioapic.
|
|
*/
|
|
new_id = find_first_zero_bit(used, 256);
|
|
reg_00.bits.ID = new_id;
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
io_apic_write(idx, 0, reg_00.raw);
|
|
reg_00.raw = io_apic_read(idx, 0);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
/* Sanity check */
|
|
BUG_ON(reg_00.bits.ID != new_id);
|
|
|
|
return new_id;
|
|
}
|
|
#endif
|
|
|
|
static int io_apic_get_version(int ioapic)
|
|
{
|
|
union IO_APIC_reg_01 reg_01;
|
|
unsigned long flags;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
reg_01.raw = io_apic_read(ioapic, 1);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
|
|
return reg_01.bits.version;
|
|
}
|
|
|
|
int acpi_get_override_irq(u32 gsi, int *trigger, int *polarity)
|
|
{
|
|
int ioapic, pin, idx;
|
|
|
|
if (skip_ioapic_setup)
|
|
return -1;
|
|
|
|
ioapic = mp_find_ioapic(gsi);
|
|
if (ioapic < 0)
|
|
return -1;
|
|
|
|
pin = mp_find_ioapic_pin(ioapic, gsi);
|
|
if (pin < 0)
|
|
return -1;
|
|
|
|
idx = find_irq_entry(ioapic, pin, mp_INT);
|
|
if (idx < 0)
|
|
return -1;
|
|
|
|
*trigger = irq_trigger(idx);
|
|
*polarity = irq_polarity(idx);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function currently is only a helper for the i386 smp boot process where
|
|
* we need to reprogram the ioredtbls to cater for the cpus which have come online
|
|
* so mask in all cases should simply be apic->target_cpus()
|
|
*/
|
|
#ifdef CONFIG_SMP
|
|
void __init setup_ioapic_dest(void)
|
|
{
|
|
int pin, ioapic, irq, irq_entry;
|
|
const struct cpumask *mask;
|
|
struct irq_desc *desc;
|
|
struct irq_data *idata;
|
|
struct irq_chip *chip;
|
|
|
|
if (skip_ioapic_setup == 1)
|
|
return;
|
|
|
|
for_each_ioapic_pin(ioapic, pin) {
|
|
irq_entry = find_irq_entry(ioapic, pin, mp_INT);
|
|
if (irq_entry == -1)
|
|
continue;
|
|
|
|
irq = pin_2_irq(irq_entry, ioapic, pin, 0);
|
|
if (irq < 0 || !mp_init_irq_at_boot(ioapic, irq))
|
|
continue;
|
|
|
|
desc = irq_to_desc(irq);
|
|
raw_spin_lock_irq(&desc->lock);
|
|
idata = irq_desc_get_irq_data(desc);
|
|
|
|
/*
|
|
* Honour affinities which have been set in early boot
|
|
*/
|
|
if (!irqd_can_balance(idata) || irqd_affinity_was_set(idata))
|
|
mask = irq_data_get_affinity_mask(idata);
|
|
else
|
|
mask = apic->target_cpus();
|
|
|
|
chip = irq_data_get_irq_chip(idata);
|
|
/* Might be lapic_chip for irq 0 */
|
|
if (chip->irq_set_affinity)
|
|
chip->irq_set_affinity(idata, mask, false);
|
|
raw_spin_unlock_irq(&desc->lock);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#define IOAPIC_RESOURCE_NAME_SIZE 11
|
|
|
|
static struct resource *ioapic_resources;
|
|
|
|
static struct resource * __init ioapic_setup_resources(void)
|
|
{
|
|
unsigned long n;
|
|
struct resource *res;
|
|
char *mem;
|
|
int i, num = 0;
|
|
|
|
for_each_ioapic(i)
|
|
num++;
|
|
if (num == 0)
|
|
return NULL;
|
|
|
|
n = IOAPIC_RESOURCE_NAME_SIZE + sizeof(struct resource);
|
|
n *= num;
|
|
|
|
mem = alloc_bootmem(n);
|
|
res = (void *)mem;
|
|
|
|
mem += sizeof(struct resource) * num;
|
|
|
|
num = 0;
|
|
for_each_ioapic(i) {
|
|
res[num].name = mem;
|
|
res[num].flags = IORESOURCE_MEM | IORESOURCE_BUSY;
|
|
snprintf(mem, IOAPIC_RESOURCE_NAME_SIZE, "IOAPIC %u", i);
|
|
mem += IOAPIC_RESOURCE_NAME_SIZE;
|
|
ioapics[i].iomem_res = &res[num];
|
|
num++;
|
|
}
|
|
|
|
ioapic_resources = res;
|
|
|
|
return res;
|
|
}
|
|
|
|
void __init io_apic_init_mappings(void)
|
|
{
|
|
unsigned long ioapic_phys, idx = FIX_IO_APIC_BASE_0;
|
|
struct resource *ioapic_res;
|
|
int i;
|
|
|
|
ioapic_res = ioapic_setup_resources();
|
|
for_each_ioapic(i) {
|
|
if (smp_found_config) {
|
|
ioapic_phys = mpc_ioapic_addr(i);
|
|
#ifdef CONFIG_X86_32
|
|
if (!ioapic_phys) {
|
|
printk(KERN_ERR
|
|
"WARNING: bogus zero IO-APIC "
|
|
"address found in MPTABLE, "
|
|
"disabling IO/APIC support!\n");
|
|
smp_found_config = 0;
|
|
skip_ioapic_setup = 1;
|
|
goto fake_ioapic_page;
|
|
}
|
|
#endif
|
|
} else {
|
|
#ifdef CONFIG_X86_32
|
|
fake_ioapic_page:
|
|
#endif
|
|
ioapic_phys = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
|
|
ioapic_phys = __pa(ioapic_phys);
|
|
}
|
|
set_fixmap_nocache(idx, ioapic_phys);
|
|
apic_printk(APIC_VERBOSE, "mapped IOAPIC to %08lx (%08lx)\n",
|
|
__fix_to_virt(idx) + (ioapic_phys & ~PAGE_MASK),
|
|
ioapic_phys);
|
|
idx++;
|
|
|
|
ioapic_res->start = ioapic_phys;
|
|
ioapic_res->end = ioapic_phys + IO_APIC_SLOT_SIZE - 1;
|
|
ioapic_res++;
|
|
}
|
|
}
|
|
|
|
void __init ioapic_insert_resources(void)
|
|
{
|
|
int i;
|
|
struct resource *r = ioapic_resources;
|
|
|
|
if (!r) {
|
|
if (nr_ioapics > 0)
|
|
printk(KERN_ERR
|
|
"IO APIC resources couldn't be allocated.\n");
|
|
return;
|
|
}
|
|
|
|
for_each_ioapic(i) {
|
|
insert_resource(&iomem_resource, r);
|
|
r++;
|
|
}
|
|
}
|
|
|
|
int mp_find_ioapic(u32 gsi)
|
|
{
|
|
int i;
|
|
|
|
if (nr_ioapics == 0)
|
|
return -1;
|
|
|
|
/* Find the IOAPIC that manages this GSI. */
|
|
for_each_ioapic(i) {
|
|
struct mp_ioapic_gsi *gsi_cfg = mp_ioapic_gsi_routing(i);
|
|
if (gsi >= gsi_cfg->gsi_base && gsi <= gsi_cfg->gsi_end)
|
|
return i;
|
|
}
|
|
|
|
printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
|
|
return -1;
|
|
}
|
|
|
|
int mp_find_ioapic_pin(int ioapic, u32 gsi)
|
|
{
|
|
struct mp_ioapic_gsi *gsi_cfg;
|
|
|
|
if (WARN_ON(ioapic < 0))
|
|
return -1;
|
|
|
|
gsi_cfg = mp_ioapic_gsi_routing(ioapic);
|
|
if (WARN_ON(gsi > gsi_cfg->gsi_end))
|
|
return -1;
|
|
|
|
return gsi - gsi_cfg->gsi_base;
|
|
}
|
|
|
|
static int bad_ioapic_register(int idx)
|
|
{
|
|
union IO_APIC_reg_00 reg_00;
|
|
union IO_APIC_reg_01 reg_01;
|
|
union IO_APIC_reg_02 reg_02;
|
|
|
|
reg_00.raw = io_apic_read(idx, 0);
|
|
reg_01.raw = io_apic_read(idx, 1);
|
|
reg_02.raw = io_apic_read(idx, 2);
|
|
|
|
if (reg_00.raw == -1 && reg_01.raw == -1 && reg_02.raw == -1) {
|
|
pr_warn("I/O APIC 0x%x registers return all ones, skipping!\n",
|
|
mpc_ioapic_addr(idx));
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int find_free_ioapic_entry(void)
|
|
{
|
|
int idx;
|
|
|
|
for (idx = 0; idx < MAX_IO_APICS; idx++)
|
|
if (ioapics[idx].nr_registers == 0)
|
|
return idx;
|
|
|
|
return MAX_IO_APICS;
|
|
}
|
|
|
|
/**
|
|
* mp_register_ioapic - Register an IOAPIC device
|
|
* @id: hardware IOAPIC ID
|
|
* @address: physical address of IOAPIC register area
|
|
* @gsi_base: base of GSI associated with the IOAPIC
|
|
* @cfg: configuration information for the IOAPIC
|
|
*/
|
|
int mp_register_ioapic(int id, u32 address, u32 gsi_base,
|
|
struct ioapic_domain_cfg *cfg)
|
|
{
|
|
bool hotplug = !!ioapic_initialized;
|
|
struct mp_ioapic_gsi *gsi_cfg;
|
|
int idx, ioapic, entries;
|
|
u32 gsi_end;
|
|
|
|
if (!address) {
|
|
pr_warn("Bogus (zero) I/O APIC address found, skipping!\n");
|
|
return -EINVAL;
|
|
}
|
|
for_each_ioapic(ioapic)
|
|
if (ioapics[ioapic].mp_config.apicaddr == address) {
|
|
pr_warn("address 0x%x conflicts with IOAPIC%d\n",
|
|
address, ioapic);
|
|
return -EEXIST;
|
|
}
|
|
|
|
idx = find_free_ioapic_entry();
|
|
if (idx >= MAX_IO_APICS) {
|
|
pr_warn("Max # of I/O APICs (%d) exceeded (found %d), skipping\n",
|
|
MAX_IO_APICS, idx);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
ioapics[idx].mp_config.type = MP_IOAPIC;
|
|
ioapics[idx].mp_config.flags = MPC_APIC_USABLE;
|
|
ioapics[idx].mp_config.apicaddr = address;
|
|
|
|
set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
|
|
if (bad_ioapic_register(idx)) {
|
|
clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
|
|
return -ENODEV;
|
|
}
|
|
|
|
ioapics[idx].mp_config.apicid = io_apic_unique_id(idx, id);
|
|
ioapics[idx].mp_config.apicver = io_apic_get_version(idx);
|
|
|
|
/*
|
|
* Build basic GSI lookup table to facilitate gsi->io_apic lookups
|
|
* and to prevent reprogramming of IOAPIC pins (PCI GSIs).
|
|
*/
|
|
entries = io_apic_get_redir_entries(idx);
|
|
gsi_end = gsi_base + entries - 1;
|
|
for_each_ioapic(ioapic) {
|
|
gsi_cfg = mp_ioapic_gsi_routing(ioapic);
|
|
if ((gsi_base >= gsi_cfg->gsi_base &&
|
|
gsi_base <= gsi_cfg->gsi_end) ||
|
|
(gsi_end >= gsi_cfg->gsi_base &&
|
|
gsi_end <= gsi_cfg->gsi_end)) {
|
|
pr_warn("GSI range [%u-%u] for new IOAPIC conflicts with GSI[%u-%u]\n",
|
|
gsi_base, gsi_end,
|
|
gsi_cfg->gsi_base, gsi_cfg->gsi_end);
|
|
clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
|
|
return -ENOSPC;
|
|
}
|
|
}
|
|
gsi_cfg = mp_ioapic_gsi_routing(idx);
|
|
gsi_cfg->gsi_base = gsi_base;
|
|
gsi_cfg->gsi_end = gsi_end;
|
|
|
|
ioapics[idx].irqdomain = NULL;
|
|
ioapics[idx].irqdomain_cfg = *cfg;
|
|
|
|
/*
|
|
* If mp_register_ioapic() is called during early boot stage when
|
|
* walking ACPI/SFI/DT tables, it's too early to create irqdomain,
|
|
* we are still using bootmem allocator. So delay it to setup_IO_APIC().
|
|
*/
|
|
if (hotplug) {
|
|
if (mp_irqdomain_create(idx)) {
|
|
clear_fixmap(FIX_IO_APIC_BASE_0 + idx);
|
|
return -ENOMEM;
|
|
}
|
|
alloc_ioapic_saved_registers(idx);
|
|
}
|
|
|
|
if (gsi_cfg->gsi_end >= gsi_top)
|
|
gsi_top = gsi_cfg->gsi_end + 1;
|
|
if (nr_ioapics <= idx)
|
|
nr_ioapics = idx + 1;
|
|
|
|
/* Set nr_registers to mark entry present */
|
|
ioapics[idx].nr_registers = entries;
|
|
|
|
pr_info("IOAPIC[%d]: apic_id %d, version %d, address 0x%x, GSI %d-%d\n",
|
|
idx, mpc_ioapic_id(idx),
|
|
mpc_ioapic_ver(idx), mpc_ioapic_addr(idx),
|
|
gsi_cfg->gsi_base, gsi_cfg->gsi_end);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mp_unregister_ioapic(u32 gsi_base)
|
|
{
|
|
int ioapic, pin;
|
|
int found = 0;
|
|
|
|
for_each_ioapic(ioapic)
|
|
if (ioapics[ioapic].gsi_config.gsi_base == gsi_base) {
|
|
found = 1;
|
|
break;
|
|
}
|
|
if (!found) {
|
|
pr_warn("can't find IOAPIC for GSI %d\n", gsi_base);
|
|
return -ENODEV;
|
|
}
|
|
|
|
for_each_pin(ioapic, pin) {
|
|
u32 gsi = mp_pin_to_gsi(ioapic, pin);
|
|
int irq = mp_map_gsi_to_irq(gsi, 0, NULL);
|
|
struct mp_chip_data *data;
|
|
|
|
if (irq >= 0) {
|
|
data = irq_get_chip_data(irq);
|
|
if (data && data->count) {
|
|
pr_warn("pin%d on IOAPIC%d is still in use.\n",
|
|
pin, ioapic);
|
|
return -EBUSY;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Mark entry not present */
|
|
ioapics[ioapic].nr_registers = 0;
|
|
ioapic_destroy_irqdomain(ioapic);
|
|
free_ioapic_saved_registers(ioapic);
|
|
if (ioapics[ioapic].iomem_res)
|
|
release_resource(ioapics[ioapic].iomem_res);
|
|
clear_fixmap(FIX_IO_APIC_BASE_0 + ioapic);
|
|
memset(&ioapics[ioapic], 0, sizeof(ioapics[ioapic]));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int mp_ioapic_registered(u32 gsi_base)
|
|
{
|
|
int ioapic;
|
|
|
|
for_each_ioapic(ioapic)
|
|
if (ioapics[ioapic].gsi_config.gsi_base == gsi_base)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mp_irqdomain_get_attr(u32 gsi, struct mp_chip_data *data,
|
|
struct irq_alloc_info *info)
|
|
{
|
|
if (info && info->ioapic_valid) {
|
|
data->trigger = info->ioapic_trigger;
|
|
data->polarity = info->ioapic_polarity;
|
|
} else if (acpi_get_override_irq(gsi, &data->trigger,
|
|
&data->polarity) < 0) {
|
|
/* PCI interrupts are always active low level triggered. */
|
|
data->trigger = IOAPIC_LEVEL;
|
|
data->polarity = IOAPIC_POL_LOW;
|
|
}
|
|
}
|
|
|
|
static void mp_setup_entry(struct irq_cfg *cfg, struct mp_chip_data *data,
|
|
struct IO_APIC_route_entry *entry)
|
|
{
|
|
memset(entry, 0, sizeof(*entry));
|
|
entry->delivery_mode = apic->irq_delivery_mode;
|
|
entry->dest_mode = apic->irq_dest_mode;
|
|
entry->dest = cfg->dest_apicid;
|
|
entry->vector = cfg->vector;
|
|
entry->trigger = data->trigger;
|
|
entry->polarity = data->polarity;
|
|
/*
|
|
* Mask level triggered irqs. Edge triggered irqs are masked
|
|
* by the irq core code in case they fire.
|
|
*/
|
|
if (data->trigger == IOAPIC_LEVEL)
|
|
entry->mask = IOAPIC_MASKED;
|
|
else
|
|
entry->mask = IOAPIC_UNMASKED;
|
|
}
|
|
|
|
int mp_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs, void *arg)
|
|
{
|
|
int ret, ioapic, pin;
|
|
struct irq_cfg *cfg;
|
|
struct irq_data *irq_data;
|
|
struct mp_chip_data *data;
|
|
struct irq_alloc_info *info = arg;
|
|
unsigned long flags;
|
|
|
|
if (!info || nr_irqs > 1)
|
|
return -EINVAL;
|
|
irq_data = irq_domain_get_irq_data(domain, virq);
|
|
if (!irq_data)
|
|
return -EINVAL;
|
|
|
|
ioapic = mp_irqdomain_ioapic_idx(domain);
|
|
pin = info->ioapic_pin;
|
|
if (irq_find_mapping(domain, (irq_hw_number_t)pin) > 0)
|
|
return -EEXIST;
|
|
|
|
data = kzalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
info->ioapic_entry = &data->entry;
|
|
ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, info);
|
|
if (ret < 0) {
|
|
kfree(data);
|
|
return ret;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&data->irq_2_pin);
|
|
irq_data->hwirq = info->ioapic_pin;
|
|
irq_data->chip = (domain->parent == x86_vector_domain) ?
|
|
&ioapic_chip : &ioapic_ir_chip;
|
|
irq_data->chip_data = data;
|
|
mp_irqdomain_get_attr(mp_pin_to_gsi(ioapic, pin), data, info);
|
|
|
|
cfg = irqd_cfg(irq_data);
|
|
add_pin_to_irq_node(data, ioapic_alloc_attr_node(info), ioapic, pin);
|
|
|
|
local_irq_save(flags);
|
|
if (info->ioapic_entry)
|
|
mp_setup_entry(cfg, data, info->ioapic_entry);
|
|
mp_register_handler(virq, data->trigger);
|
|
if (virq < nr_legacy_irqs())
|
|
legacy_pic->mask(virq);
|
|
local_irq_restore(flags);
|
|
|
|
apic_printk(APIC_VERBOSE, KERN_DEBUG
|
|
"IOAPIC[%d]: Set routing entry (%d-%d -> 0x%x -> IRQ %d Mode:%i Active:%i Dest:%d)\n",
|
|
ioapic, mpc_ioapic_id(ioapic), pin, cfg->vector,
|
|
virq, data->trigger, data->polarity, cfg->dest_apicid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mp_irqdomain_free(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs)
|
|
{
|
|
struct irq_data *irq_data;
|
|
struct mp_chip_data *data;
|
|
|
|
BUG_ON(nr_irqs != 1);
|
|
irq_data = irq_domain_get_irq_data(domain, virq);
|
|
if (irq_data && irq_data->chip_data) {
|
|
data = irq_data->chip_data;
|
|
__remove_pin_from_irq(data, mp_irqdomain_ioapic_idx(domain),
|
|
(int)irq_data->hwirq);
|
|
WARN_ON(!list_empty(&data->irq_2_pin));
|
|
kfree(irq_data->chip_data);
|
|
}
|
|
irq_domain_free_irqs_top(domain, virq, nr_irqs);
|
|
}
|
|
|
|
void mp_irqdomain_activate(struct irq_domain *domain,
|
|
struct irq_data *irq_data)
|
|
{
|
|
unsigned long flags;
|
|
struct irq_pin_list *entry;
|
|
struct mp_chip_data *data = irq_data->chip_data;
|
|
|
|
raw_spin_lock_irqsave(&ioapic_lock, flags);
|
|
for_each_irq_pin(entry, data->irq_2_pin)
|
|
__ioapic_write_entry(entry->apic, entry->pin, data->entry);
|
|
raw_spin_unlock_irqrestore(&ioapic_lock, flags);
|
|
}
|
|
|
|
void mp_irqdomain_deactivate(struct irq_domain *domain,
|
|
struct irq_data *irq_data)
|
|
{
|
|
/* It won't be called for IRQ with multiple IOAPIC pins associated */
|
|
ioapic_mask_entry(mp_irqdomain_ioapic_idx(domain),
|
|
(int)irq_data->hwirq);
|
|
}
|
|
|
|
int mp_irqdomain_ioapic_idx(struct irq_domain *domain)
|
|
{
|
|
return (int)(long)domain->host_data;
|
|
}
|
|
|
|
const struct irq_domain_ops mp_ioapic_irqdomain_ops = {
|
|
.alloc = mp_irqdomain_alloc,
|
|
.free = mp_irqdomain_free,
|
|
.activate = mp_irqdomain_activate,
|
|
.deactivate = mp_irqdomain_deactivate,
|
|
};
|