From 4173a0e7371ece227559b44943c6fd456ee470d1 Mon Sep 17 00:00:00 2001 From: Dean Nelson Date: Thu, 2 Oct 2008 12:18:21 -0500 Subject: [PATCH] x86, UV: add uv_setup_irq() and uv_teardown_irq() functions, v3 Provide a means for UV interrupt MMRs to be setup with the message to be sent when an MSI is raised. Signed-off-by: Dean Nelson Signed-off-by: Ingo Molnar --- arch/x86/kernel/Makefile | 2 +- arch/x86/kernel/io_apic.c | 68 ++++++++++++++++++++++++++++++++ arch/x86/kernel/uv_irq.c | 77 +++++++++++++++++++++++++++++++++++++ include/asm-x86/uv/uv_irq.h | 36 +++++++++++++++++ 4 files changed, 182 insertions(+), 1 deletion(-) create mode 100644 arch/x86/kernel/uv_irq.c create mode 100644 include/asm-x86/uv/uv_irq.h diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 45cecc59d89..acc0e8bf043 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -108,7 +108,7 @@ obj-$(CONFIG_MICROCODE) += microcode.o # 64 bit specific files ifeq ($(CONFIG_X86_64),y) obj-y += genapic_64.o genapic_flat_64.o genx2apic_uv_x.o tlb_uv.o - obj-y += bios_uv.o + obj-y += bios_uv.o uv_irq.o obj-y += genx2apic_cluster.o obj-y += genx2apic_phys.o obj-$(CONFIG_X86_PM_TIMER) += pmtimer_64.o diff --git a/arch/x86/kernel/io_apic.c b/arch/x86/kernel/io_apic.c index 4ee270d3035..260c95a5e6d 100644 --- a/arch/x86/kernel/io_apic.c +++ b/arch/x86/kernel/io_apic.c @@ -58,6 +58,8 @@ #include #include #include +#include +#include #include #include @@ -3692,6 +3694,72 @@ int arch_setup_ht_irq(unsigned int irq, struct pci_dev *dev) } #endif /* CONFIG_HT_IRQ */ +#ifdef CONFIG_X86_64 +/* + * Re-target the irq to the specified CPU and enable the specified MMR located + * on the specified blade to allow the sending of MSIs to the specified CPU. + */ +int arch_enable_uv_irq(char *irq_name, unsigned int irq, int cpu, int mmr_blade, + unsigned long mmr_offset) +{ + const cpumask_t *eligible_cpu = get_cpu_mask(cpu); + struct irq_cfg *cfg; + int mmr_pnode; + unsigned long mmr_value; + struct uv_IO_APIC_route_entry *entry; + unsigned long flags; + int err; + + err = assign_irq_vector(irq, *eligible_cpu); + if (err != 0) + return err; + + spin_lock_irqsave(&vector_lock, flags); + set_irq_chip_and_handler_name(irq, &uv_irq_chip, handle_percpu_irq, + irq_name); + spin_unlock_irqrestore(&vector_lock, flags); + + cfg = irq_cfg(irq); + + mmr_value = 0; + entry = (struct uv_IO_APIC_route_entry *)&mmr_value; + BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long)); + + entry->vector = cfg->vector; + entry->delivery_mode = INT_DELIVERY_MODE; + entry->dest_mode = INT_DEST_MODE; + entry->polarity = 0; + entry->trigger = 0; + entry->mask = 0; + entry->dest = cpu_mask_to_apicid(*eligible_cpu); + + mmr_pnode = uv_blade_to_pnode(mmr_blade); + uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value); + + return irq; +} + +/* + * Disable the specified MMR located on the specified blade so that MSIs are + * longer allowed to be sent. + */ +void arch_disable_uv_irq(int mmr_blade, unsigned long mmr_offset) +{ + unsigned long mmr_value; + struct uv_IO_APIC_route_entry *entry; + int mmr_pnode; + + mmr_value = 0; + entry = (struct uv_IO_APIC_route_entry *)&mmr_value; + BUG_ON(sizeof(struct uv_IO_APIC_route_entry) != sizeof(unsigned long)); + + entry->mask = 1; + + mmr_pnode = uv_blade_to_pnode(mmr_blade); + uv_write_global_mmr64(mmr_pnode, mmr_offset, mmr_value); +} +#endif /* CONFIG_X86_64 */ + int __init io_apic_get_redir_entries (int ioapic) { union IO_APIC_reg_01 reg_01; diff --git a/arch/x86/kernel/uv_irq.c b/arch/x86/kernel/uv_irq.c new file mode 100644 index 00000000000..6bd26c91c30 --- /dev/null +++ b/arch/x86/kernel/uv_irq.c @@ -0,0 +1,77 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * SGI UV IRQ functions + * + * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved. + */ + +#include +#include +#include + +static void uv_noop(unsigned int irq) +{ +} + +static unsigned int uv_noop_ret(unsigned int irq) +{ + return 0; +} + +static void uv_ack_apic(unsigned int irq) +{ + ack_APIC_irq(); +} + +struct irq_chip uv_irq_chip = { + .name = "UV-CORE", + .startup = uv_noop_ret, + .shutdown = uv_noop, + .enable = uv_noop, + .disable = uv_noop, + .ack = uv_noop, + .mask = uv_noop, + .unmask = uv_noop, + .eoi = uv_ack_apic, + .end = uv_noop, +}; + +/* + * Set up a mapping of an available irq and vector, and enable the specified + * MMR that defines the MSI that is to be sent to the specified CPU when an + * interrupt is raised. + */ +int uv_setup_irq(char *irq_name, int cpu, int mmr_blade, + unsigned long mmr_offset) +{ + int irq; + int ret; + + irq = create_irq(); + if (irq <= 0) + return -EBUSY; + + ret = arch_enable_uv_irq(irq_name, irq, cpu, mmr_blade, mmr_offset); + if (ret != irq) + destroy_irq(irq); + + return ret; +} +EXPORT_SYMBOL_GPL(uv_setup_irq); + +/* + * Tear down a mapping of an irq and vector, and disable the specified MMR that + * defined the MSI that was to be sent to the specified CPU when an interrupt + * was raised. + * + * Set mmr_blade and mmr_offset to what was passed in on uv_setup_irq(). + */ +void uv_teardown_irq(unsigned int irq, int mmr_blade, unsigned long mmr_offset) +{ + arch_disable_uv_irq(mmr_blade, mmr_offset); + destroy_irq(irq); +} +EXPORT_SYMBOL_GPL(uv_teardown_irq); diff --git a/include/asm-x86/uv/uv_irq.h b/include/asm-x86/uv/uv_irq.h new file mode 100644 index 00000000000..8bf5f32da9c --- /dev/null +++ b/include/asm-x86/uv/uv_irq.h @@ -0,0 +1,36 @@ +/* + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + * + * SGI UV IRQ definitions + * + * Copyright (C) 2008 Silicon Graphics, Inc. All rights reserved. + */ + +#ifndef ASM_X86__UV__UV_IRQ_H +#define ASM_X86__UV__UV_IRQ_H + +/* If a generic version of this structure gets defined, eliminate this one. */ +struct uv_IO_APIC_route_entry { + __u64 vector : 8, + delivery_mode : 3, + dest_mode : 1, + delivery_status : 1, + polarity : 1, + __reserved_1 : 1, + trigger : 1, + mask : 1, + __reserved_2 : 15, + dest : 32; +}; + +extern struct irq_chip uv_irq_chip; + +extern int arch_enable_uv_irq(char *, unsigned int, int, int, unsigned long); +extern void arch_disable_uv_irq(int, unsigned long); + +extern int uv_setup_irq(char *, int, int, unsigned long); +extern void uv_teardown_irq(unsigned int, int, unsigned long); + +#endif /* ASM_X86__UV__UV_IRQ_H */ -- 2.41.1