1 #include <linux/kernel.h> 2 #include <linux/string.h> 3 #include <linux/cpumask.h> 4 #include <linux/errno.h> 5 #include <linux/msi.h> 6 7 #include <asm/hw_irq.h> 8 #include <asm/irq_remapping.h> 9 10 #include "irq_remapping.h" 11 12 int irq_remapping_enabled; 13 14 int disable_irq_remap; 15 int disable_sourceid_checking; 16 int no_x2apic_optout; 17 18 static struct irq_remap_ops *remap_ops; 19 20 static __init int setup_nointremap(char *str) 21 { 22 disable_irq_remap = 1; 23 return 0; 24 } 25 early_param("nointremap", setup_nointremap); 26 27 static __init int setup_irqremap(char *str) 28 { 29 if (!str) 30 return -EINVAL; 31 32 while (*str) { 33 if (!strncmp(str, "on", 2)) 34 disable_irq_remap = 0; 35 else if (!strncmp(str, "off", 3)) 36 disable_irq_remap = 1; 37 else if (!strncmp(str, "nosid", 5)) 38 disable_sourceid_checking = 1; 39 else if (!strncmp(str, "no_x2apic_optout", 16)) 40 no_x2apic_optout = 1; 41 42 str += strcspn(str, ","); 43 while (*str == ',') 44 str++; 45 } 46 47 return 0; 48 } 49 early_param("intremap", setup_irqremap); 50 51 void __init setup_irq_remapping_ops(void) 52 { 53 remap_ops = &intel_irq_remap_ops; 54 } 55 56 int irq_remapping_supported(void) 57 { 58 if (disable_irq_remap) 59 return 0; 60 61 if (!remap_ops || !remap_ops->supported) 62 return 0; 63 64 return remap_ops->supported(); 65 } 66 67 int __init irq_remapping_prepare(void) 68 { 69 if (!remap_ops || !remap_ops->prepare) 70 return -ENODEV; 71 72 return remap_ops->prepare(); 73 } 74 75 int __init irq_remapping_enable(void) 76 { 77 if (!remap_ops || !remap_ops->enable) 78 return -ENODEV; 79 80 return remap_ops->enable(); 81 } 82 83 void irq_remapping_disable(void) 84 { 85 if (!remap_ops || !remap_ops->disable) 86 return; 87 88 remap_ops->disable(); 89 } 90 91 int irq_remapping_reenable(int mode) 92 { 93 if (!remap_ops || !remap_ops->reenable) 94 return 0; 95 96 return remap_ops->reenable(mode); 97 } 98 99 int __init irq_remap_enable_fault_handling(void) 100 { 101 if (!remap_ops || !remap_ops->enable_faulting) 102 return -ENODEV; 103 104 return remap_ops->enable_faulting(); 105 } 106 107 int setup_ioapic_remapped_entry(int irq, 108 struct IO_APIC_route_entry *entry, 109 unsigned int destination, int vector, 110 struct io_apic_irq_attr *attr) 111 { 112 if (!remap_ops || !remap_ops->setup_ioapic_entry) 113 return -ENODEV; 114 115 return remap_ops->setup_ioapic_entry(irq, entry, destination, 116 vector, attr); 117 } 118 119 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask, 120 bool force) 121 { 122 if (!config_enabled(CONFIG_SMP) || !remap_ops || 123 !remap_ops->set_affinity) 124 return 0; 125 126 return remap_ops->set_affinity(data, mask, force); 127 } 128 129 void free_remapped_irq(int irq) 130 { 131 if (!remap_ops || !remap_ops->free_irq) 132 return; 133 134 remap_ops->free_irq(irq); 135 } 136 137 void compose_remapped_msi_msg(struct pci_dev *pdev, 138 unsigned int irq, unsigned int dest, 139 struct msi_msg *msg, u8 hpet_id) 140 { 141 if (!remap_ops || !remap_ops->compose_msi_msg) 142 return; 143 144 remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id); 145 } 146 147 int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec) 148 { 149 if (!remap_ops || !remap_ops->msi_alloc_irq) 150 return -ENODEV; 151 152 return remap_ops->msi_alloc_irq(pdev, irq, nvec); 153 } 154 155 int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq, 156 int index, int sub_handle) 157 { 158 if (!remap_ops || !remap_ops->msi_setup_irq) 159 return -ENODEV; 160 161 return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle); 162 } 163 164 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id) 165 { 166 if (!remap_ops || !remap_ops->setup_hpet_msi) 167 return -ENODEV; 168 169 return remap_ops->setup_hpet_msi(irq, id); 170 } 171