#include <linux/seq_file.h> #include <linux/cpumask.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/msi.h> #include <linux/irq.h> #include <linux/pci.h> #include <asm/hw_irq.h> #include <asm/irq_remapping.h> #include <asm/processor.h> #include <asm/x86_init.h> #include <asm/apic.h> #include <asm/hpet.h> #include "irq_remapping.h" int irq_remapping_enabled; int disable_irq_remap; int irq_remap_broken; int disable_sourceid_checking; int no_x2apic_optout; static struct irq_remap_ops *remap_ops; static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec); static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq, int index, int sub_handle); static int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask, bool force); static bool irq_remapped(struct irq_cfg *cfg) { return (cfg->remapped == 1); } static void irq_remapping_disable_io_apic(void) { /* * With interrupt-remapping, for now we will use virtual wire A * mode, as virtual wire B is little complex (need to configure * both IOAPIC RTE as well as interrupt-remapping table entry). * As this gets called during crash dump, keep this simple for * now. */ if (cpu_has_apic || apic_from_smp_config()) disconnect_bsp_APIC(0); } static int do_setup_msi_irqs(struct pci_dev *dev, int nvec) { int ret, sub_handle, nvec_pow2, index = 0; unsigned int irq; struct msi_desc *msidesc; WARN_ON(!list_is_singular(&dev->msi_list)); msidesc = list_entry(dev->msi_list.next, struct msi_desc, list); WARN_ON(msidesc->irq); WARN_ON(msidesc->msi_attrib.multiple); WARN_ON(msidesc->nvec_used); irq = irq_alloc_hwirqs(nvec, dev_to_node(&dev->dev)); if (irq == 0) return -ENOSPC; nvec_pow2 = __roundup_pow_of_two(nvec); msidesc->nvec_used = nvec; msidesc->msi_attrib.multiple = ilog2(nvec_pow2); for (sub_handle = 0; sub_handle < nvec; sub_handle++) { if (!sub_handle) { index = msi_alloc_remapped_irq(dev, irq, nvec_pow2); if (index < 0) { ret = index; goto error; } } else { ret = msi_setup_remapped_irq(dev, irq + sub_handle, index, sub_handle); if (ret < 0) goto error; } ret = setup_msi_irq(dev, msidesc, irq, sub_handle); if (ret < 0) goto error; } return 0; error: irq_free_hwirqs(irq, nvec); /* * Restore altered MSI descriptor fields and prevent just destroyed * IRQs from tearing down again in default_teardown_msi_irqs() */ msidesc->irq = 0; msidesc->nvec_used = 0; msidesc->msi_attrib.multiple = 0; return ret; } static int do_setup_msix_irqs(struct pci_dev *dev, int nvec) { int node, ret, sub_handle, index = 0; struct msi_desc *msidesc; unsigned int irq; node = dev_to_node(&dev->dev); sub_handle = 0; list_for_each_entry(msidesc, &dev->msi_list, list) { irq = irq_alloc_hwirq(node); if (irq == 0) return -1; if (sub_handle == 0) ret = index = msi_alloc_remapped_irq(dev, irq, nvec); else ret = msi_setup_remapped_irq(dev, irq, index, sub_handle); if (ret < 0) goto error; ret = setup_msi_irq(dev, msidesc, irq, 0); if (ret < 0) goto error; sub_handle += 1; irq += 1; } return 0; error: irq_free_hwirq(irq); return ret; } static int irq_remapping_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) { if (type == PCI_CAP_ID_MSI) return do_setup_msi_irqs(dev, nvec); else return do_setup_msix_irqs(dev, nvec); } static void eoi_ioapic_pin_remapped(int apic, int pin, int vector) { /* * 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. */ io_apic_eoi(apic, pin); } static void __init irq_remapping_modify_x86_ops(void) { x86_io_apic_ops.disable = irq_remapping_disable_io_apic; x86_io_apic_ops.set_affinity = set_remapped_irq_affinity; x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry; x86_io_apic_ops.eoi_ioapic_pin = eoi_ioapic_pin_remapped; x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs; x86_msi.setup_hpet_msi = setup_hpet_msi_remapped; x86_msi.compose_msi_msg = compose_remapped_msi_msg; } static __init int setup_nointremap(char *str) { disable_irq_remap = 1; return 0; } early_param("nointremap", setup_nointremap); static __init int setup_irqremap(char *str) { if (!str) return -EINVAL; while (*str) { if (!strncmp(str, "on", 2)) disable_irq_remap = 0; else if (!strncmp(str, "off", 3)) disable_irq_remap = 1; else if (!strncmp(str, "nosid", 5)) disable_sourceid_checking = 1; else if (!strncmp(str, "no_x2apic_optout", 16)) no_x2apic_optout = 1; str += strcspn(str, ","); while (*str == ',') str++; } return 0; } early_param("intremap", setup_irqremap); void __init setup_irq_remapping_ops(void) { remap_ops = &intel_irq_remap_ops; #ifdef CONFIG_AMD_IOMMU if (amd_iommu_irq_ops.prepare() == 0) remap_ops = &amd_iommu_irq_ops; #endif } void set_irq_remapping_broken(void) { irq_remap_broken = 1; } int irq_remapping_supported(void) { if (disable_irq_remap) return 0; if (!remap_ops || !remap_ops->supported) return 0; return remap_ops->supported(); } int __init irq_remapping_prepare(void) { if (!remap_ops || !remap_ops->prepare) return -ENODEV; return remap_ops->prepare(); } int __init irq_remapping_enable(void) { int ret; if (!remap_ops || !remap_ops->enable) return -ENODEV; ret = remap_ops->enable(); if (irq_remapping_enabled) irq_remapping_modify_x86_ops(); return ret; } void irq_remapping_disable(void) { if (!irq_remapping_enabled || !remap_ops || !remap_ops->disable) return; remap_ops->disable(); } int irq_remapping_reenable(int mode) { if (!irq_remapping_enabled || !remap_ops || !remap_ops->reenable) return 0; return remap_ops->reenable(mode); } int __init irq_remap_enable_fault_handling(void) { if (!irq_remapping_enabled) return 0; if (!remap_ops || !remap_ops->enable_faulting) return -ENODEV; return remap_ops->enable_faulting(); } int setup_ioapic_remapped_entry(int irq, struct IO_APIC_route_entry *entry, unsigned int destination, int vector, struct io_apic_irq_attr *attr) { if (!remap_ops || !remap_ops->setup_ioapic_entry) return -ENODEV; return remap_ops->setup_ioapic_entry(irq, entry, destination, vector, attr); } static int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask, bool force) { if (!config_enabled(CONFIG_SMP) || !remap_ops || !remap_ops->set_affinity) return 0; return remap_ops->set_affinity(data, mask, force); } void free_remapped_irq(int irq) { struct irq_cfg *cfg = irq_get_chip_data(irq); if (!remap_ops || !remap_ops->free_irq) return; if (irq_remapped(cfg)) remap_ops->free_irq(irq); } void compose_remapped_msi_msg(struct pci_dev *pdev, unsigned int irq, unsigned int dest, struct msi_msg *msg, u8 hpet_id) { struct irq_cfg *cfg = irq_get_chip_data(irq); if (!irq_remapped(cfg)) native_compose_msi_msg(pdev, irq, dest, msg, hpet_id); else if (remap_ops && remap_ops->compose_msi_msg) remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id); } static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec) { if (!remap_ops || !remap_ops->msi_alloc_irq) return -ENODEV; return remap_ops->msi_alloc_irq(pdev, irq, nvec); } static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq, int index, int sub_handle) { if (!remap_ops || !remap_ops->msi_setup_irq) return -ENODEV; return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle); } int setup_hpet_msi_remapped(unsigned int irq, unsigned int id) { int ret; if (!remap_ops || !remap_ops->alloc_hpet_msi) return -ENODEV; ret = remap_ops->alloc_hpet_msi(irq, id); if (ret) return -EINVAL; return default_setup_hpet_msi(irq, id); } void panic_if_irq_remap(const char *msg) { if (irq_remapping_enabled) panic(msg); } static void ir_ack_apic_edge(struct irq_data *data) { ack_APIC_irq(); } static void ir_ack_apic_level(struct irq_data *data) { ack_APIC_irq(); eoi_ioapic_irq(data->irq, data->chip_data); } static void ir_print_prefix(struct irq_data *data, struct seq_file *p) { seq_printf(p, " IR-%s", data->chip->name); } void irq_remap_modify_chip_defaults(struct irq_chip *chip) { chip->irq_print_chip = ir_print_prefix; chip->irq_ack = ir_ack_apic_edge; chip->irq_eoi = ir_ack_apic_level; chip->irq_set_affinity = x86_io_apic_ops.set_affinity; } bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip) { if (!irq_remapped(cfg)) return false; irq_set_status_flags(irq, IRQ_MOVE_PCNTXT); irq_remap_modify_chip_defaults(chip); return true; }