From 95d76acc7518d566df18d67c1343bb375b78d1f3 Mon Sep 17 00:00:00 2001 From: Jiang Liu Date: Mon, 9 Jun 2014 16:19:48 +0800 Subject: [PATCH] x86, irq: Count legacy IRQs by legacy_pic->nr_legacy_irqs instead of NR_IRQS_LEGACY Some platforms, such as Intel MID and mshypv, do not support legacy interrupt controllers. So count legacy IRQs by legacy_pic->nr_legacy_irqs instead of hard-coded NR_IRQS_LEGACY. Signed-off-by: Jiang Liu Cc: Tony Luck Cc: Joerg Roedel Cc: Paul Gortmaker Cc: Greg Kroah-Hartman Cc: xen-devel@lists.xenproject.org Cc: Benjamin Herrenschmidt Cc: Grant Likely Cc: Rafael J. Wysocki Cc: Bjorn Helgaas Cc: Randy Dunlap Cc: Yinghai Lu Cc: Len Brown Cc: Pavel Machek Cc: Konrad Rzeszutek Wilk Cc: Rob Herring Cc: Michal Simek Cc: Tony Lindgren Acked-by: David Vrabel Link: http://lkml.kernel.org/r/1402302011-23642-20-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/i8259.h | 5 ++++ arch/x86/kernel/acpi/boot.c | 13 +++++----- arch/x86/kernel/apic/io_apic.c | 43 ++++++++++++++++++++-------------- arch/x86/kernel/devicetree.c | 13 +++++----- arch/x86/kernel/irqinit.c | 6 ++--- arch/x86/pci/xen.c | 7 +++--- 6 files changed, 51 insertions(+), 36 deletions(-) diff --git a/arch/x86/include/asm/i8259.h b/arch/x86/include/asm/i8259.h index a20365953bf8..ccffa53750a8 100644 --- a/arch/x86/include/asm/i8259.h +++ b/arch/x86/include/asm/i8259.h @@ -67,4 +67,9 @@ struct legacy_pic { extern struct legacy_pic *legacy_pic; extern struct legacy_pic null_legacy_pic; +static inline int nr_legacy_irqs(void) +{ + return legacy_pic->nr_legacy_irqs; +} + #endif /* _ASM_X86_I8259_H */ diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c index f3bafcd32b98..b12976590a72 100644 --- a/arch/x86/kernel/acpi/boot.c +++ b/arch/x86/kernel/acpi/boot.c @@ -43,6 +43,7 @@ #include #include #include +#include #include "sleep.h" /* To include x86_acpi_suspend_lowlevel */ static int __initdata acpi_force = 0; @@ -101,10 +102,10 @@ static u32 isa_irq_to_gsi[NR_IRQS_LEGACY] __read_mostly = { static unsigned int gsi_to_irq(unsigned int gsi) { - unsigned int irq = gsi + NR_IRQS_LEGACY; + unsigned int irq = gsi + nr_legacy_irqs(); unsigned int i; - for (i = 0; i < NR_IRQS_LEGACY; i++) { + for (i = 0; i < nr_legacy_irqs(); i++) { if (isa_irq_to_gsi[i] == gsi) { return i; } @@ -114,7 +115,7 @@ static unsigned int gsi_to_irq(unsigned int gsi) * except on truly weird platforms that have * non isa irqs in the first 16 gsis. */ - if (gsi >= NR_IRQS_LEGACY) + if (gsi >= nr_legacy_irqs()) irq = gsi; else irq = gsi_top + gsi; @@ -371,7 +372,7 @@ static void __init mp_override_legacy_irq(u8 bus_irq, u8 polarity, u8 trigger, * otherwise there will be more than one entry with the same GSI * and acpi_isa_irq_to_gsi() may give wrong result. */ - if (gsi < NR_IRQS_LEGACY && isa_irq_to_gsi[gsi] == gsi) + if (gsi < nr_legacy_irqs() && isa_irq_to_gsi[gsi] == gsi) isa_irq_to_gsi[gsi] = ACPI_INVALID_GSI; isa_irq_to_gsi[bus_irq] = gsi; } @@ -628,7 +629,7 @@ EXPORT_SYMBOL_GPL(acpi_gsi_to_irq); int acpi_isa_irq_to_gsi(unsigned isa_irq, u32 *gsi) { - if (isa_irq < NR_IRQS_LEGACY && + if (isa_irq < nr_legacy_irqs() && isa_irq_to_gsi[isa_irq] != ACPI_INVALID_GSI) { *gsi = isa_irq_to_gsi[isa_irq]; return 0; @@ -1017,7 +1018,7 @@ static void __init mp_config_acpi_legacy_irqs(void) * Use the default configuration for the IRQs 0-15. Unless * overridden by (MADT) interrupt source override entries. */ - for (i = 0; i < NR_IRQS_LEGACY; i++) { + for (i = 0; i < nr_legacy_irqs(); i++) { int ioapic, pin; unsigned int dstapic; int idx; diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 424f795a1c78..4208ea9edc10 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -129,10 +129,17 @@ u32 mp_pin_to_gsi(int ioapic, int pin) return mp_ioapic_gsi_routing(ioapic)->gsi_base + pin; } -/* Initialize all legacy IRQs and all pins on the first IOAPIC at boot */ +/* + * Initialize all legacy IRQs and all pins on the first IOAPIC + * if we have legacy interrupt controller. Kernel boot option "pirq=" + * may rely on non-legacy pins on the first IOAPIC. + */ static inline int mp_init_irq_at_boot(int ioapic, int irq) { - return ioapic == 0 || (irq >= 0 && irq < NR_IRQS_LEGACY); + if (!nr_legacy_irqs()) + return 0; + + return ioapic == 0 || (irq >= 0 && irq < nr_legacy_irqs()); } int nr_ioapics; @@ -216,7 +223,7 @@ int __init arch_early_irq_init(void) struct irq_cfg *cfg; int count, node, i; - if (!legacy_pic->nr_legacy_irqs) + if (!nr_legacy_irqs()) io_apic_irqs = ~0UL; for_each_ioapic(i) { @@ -239,7 +246,7 @@ int __init arch_early_irq_init(void) * For legacy IRQ's, start with assigning irq0 to irq15 to * IRQ0_VECTOR to IRQ15_VECTOR for all cpu's. */ - if (i < legacy_pic->nr_legacy_irqs) { + if (i < nr_legacy_irqs()) { cfg[i].vector = IRQ0_VECTOR + i; cpumask_setall(cfg[i].domain); } @@ -823,7 +830,7 @@ static int __init find_isa_irq_apic(int irq, int type) */ static int EISA_ELCR(unsigned int irq) { - if (irq < legacy_pic->nr_legacy_irqs) { + if (irq < nr_legacy_irqs()) { unsigned int port = 0x4d0 + (irq >> 3); return (inb(port) >> (irq & 7)) & 1; } @@ -980,7 +987,7 @@ static int pin_2_irq(int idx, int apic, int pin) } else { u32 gsi = gsi_cfg->gsi_base + pin; - if (gsi >= NR_IRQS_LEGACY) + if (gsi >= nr_legacy_irqs()) irq = gsi; else irq = gsi_top + gsi; @@ -1357,7 +1364,7 @@ static void setup_ioapic_irq(unsigned int irq, struct irq_cfg *cfg, } ioapic_register_intr(irq, cfg, attr->trigger); - if (irq < legacy_pic->nr_legacy_irqs) + if (irq < nr_legacy_irqs()) legacy_pic->mask(irq); ioapic_write_entry(attr->ioapic, attr->ioapic_pin, entry); @@ -1782,7 +1789,7 @@ __apicdebuginit(void) print_PIC(void) unsigned int v; unsigned long flags; - if (!legacy_pic->nr_legacy_irqs) + if (!nr_legacy_irqs()) return; printk(KERN_DEBUG "\nprinting PIC contents\n"); @@ -1854,7 +1861,7 @@ void __init enable_IO_APIC(void) int i8259_apic, i8259_pin; int apic, pin; - if (!legacy_pic->nr_legacy_irqs) + if (!nr_legacy_irqs()) return; for_each_ioapic_pin(apic, pin) { @@ -1939,7 +1946,7 @@ void disable_IO_APIC(void) */ clear_IO_APIC(); - if (!legacy_pic->nr_legacy_irqs) + if (!nr_legacy_irqs()) return; x86_io_apic_ops.disable(); @@ -2143,7 +2150,7 @@ static unsigned int startup_ioapic_irq(struct irq_data *data) unsigned long flags; raw_spin_lock_irqsave(&ioapic_lock, flags); - if (irq < legacy_pic->nr_legacy_irqs) { + if (irq < nr_legacy_irqs()) { legacy_pic->mask(irq); if (legacy_pic->irq_pending(irq)) was_pending = 1; @@ -2542,7 +2549,7 @@ static inline void init_IO_APIC_traps(void) * so default to an old-fashioned 8259 * interrupt if we can.. */ - if (irq < legacy_pic->nr_legacy_irqs) + if (irq < nr_legacy_irqs()) legacy_pic->make_irq(irq); else /* Strange. Oh, well.. */ @@ -2839,7 +2846,7 @@ void __init setup_IO_APIC(void) /* * calling enable_IO_APIC() is moved to setup_local_APIC for BP */ - io_apic_irqs = legacy_pic->nr_legacy_irqs ? ~PIC_IRQS : ~0UL; + io_apic_irqs = nr_legacy_irqs() ? ~PIC_IRQS : ~0UL; apic_printk(APIC_VERBOSE, "ENABLING IO-APIC IRQs\n"); /* @@ -2850,7 +2857,7 @@ void __init setup_IO_APIC(void) sync_Arb_IDs(); setup_IO_APIC_irqs(); init_IO_APIC_traps(); - if (legacy_pic->nr_legacy_irqs) + if (nr_legacy_irqs()) check_timer(); } @@ -3348,7 +3355,7 @@ static int __init io_apic_get_redir_entries(int ioapic) unsigned int arch_dynirq_lower_bound(unsigned int from) { - unsigned int min = gsi_top + NR_IRQS_LEGACY; + unsigned int min = gsi_top + nr_legacy_irqs(); return from < min ? min : from; } @@ -3360,17 +3367,17 @@ int __init arch_probe_nr_irqs(void) if (nr_irqs > (NR_VECTORS * nr_cpu_ids)) nr_irqs = NR_VECTORS * nr_cpu_ids; - nr = (gsi_top + NR_IRQS_LEGACY) + 8 * nr_cpu_ids; + nr = (gsi_top + nr_legacy_irqs()) + 8 * nr_cpu_ids; #if defined(CONFIG_PCI_MSI) || defined(CONFIG_HT_IRQ) /* * for MSI and HT dyn irq */ - nr += (gsi_top + NR_IRQS_LEGACY) * 16; + nr += gsi_top * 16; #endif if (nr < nr_irqs) nr_irqs = nr; - return NR_IRQS_LEGACY; + return nr_legacy_irqs(); } int io_apic_set_pci_routing(struct device *dev, int irq, diff --git a/arch/x86/kernel/devicetree.c b/arch/x86/kernel/devicetree.c index 7db54b5d5f86..b4680058db8b 100644 --- a/arch/x86/kernel/devicetree.c +++ b/arch/x86/kernel/devicetree.c @@ -21,6 +21,7 @@ #include #include #include +#include __initdata u64 initial_dtb; char __initdata cmd_line[COMMAND_LINE_SIZE]; @@ -314,7 +315,7 @@ static void dt_add_ioapic_domain(unsigned int ioapic_num, struct irq_domain *id; struct mp_ioapic_gsi *gsi_cfg; int ret; - int num; + int num, legacy_irqs = nr_legacy_irqs(); gsi_cfg = mp_ioapic_gsi_routing(ioapic_num); num = gsi_cfg->gsi_end - gsi_cfg->gsi_base + 1; @@ -324,17 +325,17 @@ static void dt_add_ioapic_domain(unsigned int ioapic_num, BUG_ON(!id); if (gsi_cfg->gsi_base == 0) { /* - * The first NR_IRQS_LEGACY irq descs are allocated in + * The first nr_legacy_irqs() irq descs are allocated in * early_irq_init() and need just a mapping. The * remaining irqs need both. All of them are preallocated * and assigned so we can keep the 1:1 mapping which the ioapic * is having. */ - irq_domain_associate_many(id, 0, 0, NR_IRQS_LEGACY); + irq_domain_associate_many(id, 0, 0, legacy_irqs); - if (num > NR_IRQS_LEGACY) { - ret = irq_create_strict_mappings(id, NR_IRQS_LEGACY, - NR_IRQS_LEGACY, num - NR_IRQS_LEGACY); + if (num > legacy_irqs) { + ret = irq_create_strict_mappings(id, legacy_irqs, + legacy_irqs, num - legacy_irqs); if (ret) pr_err("Error creating mapping for the " "remaining IRQs: %d\n", ret); diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c index 7f50156542fb..a0111e91eb4b 100644 --- a/arch/x86/kernel/irqinit.c +++ b/arch/x86/kernel/irqinit.c @@ -78,7 +78,7 @@ void __init init_ISA_irqs(void) #endif legacy_pic->init(0); - for (i = 0; i < legacy_pic->nr_legacy_irqs; i++) + for (i = 0; i < nr_legacy_irqs(); i++) irq_set_chip_and_handler_name(i, chip, handle_level_irq, name); } @@ -100,7 +100,7 @@ void __init init_IRQ(void) * then this vector space can be freed and re-used dynamically as the * irq's migrate etc. */ - for (i = 0; i < legacy_pic->nr_legacy_irqs; i++) + for (i = 0; i < nr_legacy_irqs(); i++) per_cpu(vector_irq, 0)[IRQ0_VECTOR + i] = i; x86_init.irqs.intr_init(); @@ -121,7 +121,7 @@ void setup_vector_irq(int cpu) * legacy PIC, for the new cpu that is coming online, setup the static * legacy vector to irq mapping: */ - for (irq = 0; irq < legacy_pic->nr_legacy_irqs; irq++) + for (irq = 0; irq < nr_legacy_irqs(); irq++) per_cpu(vector_irq, cpu)[IRQ0_VECTOR + irq] = irq; #endif diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c index 905956f16465..093f5f4272d3 100644 --- a/arch/x86/pci/xen.c +++ b/arch/x86/pci/xen.c @@ -23,6 +23,7 @@ #include #include #include +#include static int xen_pcifront_enable_irq(struct pci_dev *dev) { @@ -40,7 +41,7 @@ static int xen_pcifront_enable_irq(struct pci_dev *dev) /* In PV DomU the Xen PCI backend puts the PIRQ in the interrupt line.*/ pirq = gsi; - if (gsi < NR_IRQS_LEGACY) + if (gsi < nr_legacy_irqs()) share = 0; rc = xen_bind_pirq_gsi_to_irq(gsi, pirq, share, "pcifront"); @@ -511,7 +512,7 @@ int __init pci_xen_initial_domain(void) xen_setup_acpi_sci(); __acpi_register_gsi = acpi_register_gsi_xen; /* Pre-allocate legacy irqs */ - for (irq = 0; irq < NR_IRQS_LEGACY; irq++) { + for (irq = 0; irq < nr_legacy_irqs(); irq++) { int trigger, polarity; if (acpi_get_override_irq(irq, &trigger, &polarity) == -1) @@ -522,7 +523,7 @@ int __init pci_xen_initial_domain(void) true /* Map GSI to PIRQ */); } if (0 == nr_ioapics) { - for (irq = 0; irq < NR_IRQS_LEGACY; irq++) + for (irq = 0; irq < nr_legacy_irqs(); irq++) xen_bind_pirq_gsi_to_irq(irq, irq, 0, "xt-pic"); } return 0; -- 2.20.1