1 #include <linux/seq_file.h> 2 #include <linux/cpumask.h> 3 #include <linux/kernel.h> 4 #include <linux/string.h> 5 #include <linux/errno.h> 6 #include <linux/msi.h> 7 #include <linux/irq.h> 8 #include <linux/pci.h> 9 10 #include <asm/hw_irq.h> 11 #include <asm/irq_remapping.h> 12 #include <asm/processor.h> 13 #include <asm/x86_init.h> 14 #include <asm/apic.h> 15 16 #include "irq_remapping.h" 17 18 int irq_remapping_enabled; 19 20 int disable_irq_remap; 21 int irq_remap_broken; 22 int disable_sourceid_checking; 23 int no_x2apic_optout; 24 25 static struct irq_remap_ops *remap_ops; 26 27 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec); 28 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq, 29 int index, int sub_handle); 30 static int set_remapped_irq_affinity(struct irq_data *data, 31 const struct cpumask *mask, 32 bool force); 33 34 static bool irq_remapped(struct irq_cfg *cfg) 35 { 36 return (cfg->remapped == 1); 37 } 38 39 static void irq_remapping_disable_io_apic(void) 40 { 41 /* 42 * With interrupt-remapping, for now we will use virtual wire A 43 * mode, as virtual wire B is little complex (need to configure 44 * both IOAPIC RTE as well as interrupt-remapping table entry). 45 * As this gets called during crash dump, keep this simple for 46 * now. 47 */ 48 if (cpu_has_apic || apic_from_smp_config()) 49 disconnect_bsp_APIC(0); 50 } 51 52 static int do_setup_msi_irqs(struct pci_dev *dev, int nvec) 53 { 54 int node, ret, sub_handle, index = 0; 55 unsigned int irq; 56 struct msi_desc *msidesc; 57 58 nvec = __roundup_pow_of_two(nvec); 59 60 WARN_ON(!list_is_singular(&dev->msi_list)); 61 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list); 62 WARN_ON(msidesc->irq); 63 WARN_ON(msidesc->msi_attrib.multiple); 64 65 node = dev_to_node(&dev->dev); 66 irq = __create_irqs(get_nr_irqs_gsi(), nvec, node); 67 if (irq == 0) 68 return -ENOSPC; 69 70 msidesc->msi_attrib.multiple = ilog2(nvec); 71 for (sub_handle = 0; sub_handle < nvec; sub_handle++) { 72 if (!sub_handle) { 73 index = msi_alloc_remapped_irq(dev, irq, nvec); 74 if (index < 0) { 75 ret = index; 76 goto error; 77 } 78 } else { 79 ret = msi_setup_remapped_irq(dev, irq + sub_handle, 80 index, sub_handle); 81 if (ret < 0) 82 goto error; 83 } 84 ret = setup_msi_irq(dev, msidesc, irq, sub_handle); 85 if (ret < 0) 86 goto error; 87 } 88 return 0; 89 90 error: 91 destroy_irqs(irq, nvec); 92 93 /* 94 * Restore altered MSI descriptor fields and prevent just destroyed 95 * IRQs from tearing down again in default_teardown_msi_irqs() 96 */ 97 msidesc->irq = 0; 98 msidesc->msi_attrib.multiple = 0; 99 100 return ret; 101 } 102 103 static int do_setup_msix_irqs(struct pci_dev *dev, int nvec) 104 { 105 int node, ret, sub_handle, index = 0; 106 struct msi_desc *msidesc; 107 unsigned int irq; 108 109 node = dev_to_node(&dev->dev); 110 irq = get_nr_irqs_gsi(); 111 sub_handle = 0; 112 113 list_for_each_entry(msidesc, &dev->msi_list, list) { 114 115 irq = create_irq_nr(irq, node); 116 if (irq == 0) 117 return -1; 118 119 if (sub_handle == 0) 120 ret = index = msi_alloc_remapped_irq(dev, irq, nvec); 121 else 122 ret = msi_setup_remapped_irq(dev, irq, index, sub_handle); 123 124 if (ret < 0) 125 goto error; 126 127 ret = setup_msi_irq(dev, msidesc, irq, 0); 128 if (ret < 0) 129 goto error; 130 131 sub_handle += 1; 132 irq += 1; 133 } 134 135 return 0; 136 137 error: 138 destroy_irq(irq); 139 return ret; 140 } 141 142 static int irq_remapping_setup_msi_irqs(struct pci_dev *dev, 143 int nvec, int type) 144 { 145 if (type == PCI_CAP_ID_MSI) 146 return do_setup_msi_irqs(dev, nvec); 147 else 148 return do_setup_msix_irqs(dev, nvec); 149 } 150 151 void eoi_ioapic_pin_remapped(int apic, int pin, int vector) 152 { 153 /* 154 * Intr-remapping uses pin number as the virtual vector 155 * in the RTE. Actual vector is programmed in 156 * intr-remapping table entry. Hence for the io-apic 157 * EOI we use the pin number. 158 */ 159 io_apic_eoi(apic, pin); 160 } 161 162 static void __init irq_remapping_modify_x86_ops(void) 163 { 164 x86_io_apic_ops.disable = irq_remapping_disable_io_apic; 165 x86_io_apic_ops.set_affinity = set_remapped_irq_affinity; 166 x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry; 167 x86_io_apic_ops.eoi_ioapic_pin = eoi_ioapic_pin_remapped; 168 x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs; 169 x86_msi.setup_hpet_msi = setup_hpet_msi_remapped; 170 x86_msi.compose_msi_msg = compose_remapped_msi_msg; 171 } 172 173 static __init int setup_nointremap(char *str) 174 { 175 disable_irq_remap = 1; 176 return 0; 177 } 178 early_param("nointremap", setup_nointremap); 179 180 static __init int setup_irqremap(char *str) 181 { 182 if (!str) 183 return -EINVAL; 184 185 while (*str) { 186 if (!strncmp(str, "on", 2)) 187 disable_irq_remap = 0; 188 else if (!strncmp(str, "off", 3)) 189 disable_irq_remap = 1; 190 else if (!strncmp(str, "nosid", 5)) 191 disable_sourceid_checking = 1; 192 else if (!strncmp(str, "no_x2apic_optout", 16)) 193 no_x2apic_optout = 1; 194 195 str += strcspn(str, ","); 196 while (*str == ',') 197 str++; 198 } 199 200 return 0; 201 } 202 early_param("intremap", setup_irqremap); 203 204 void __init setup_irq_remapping_ops(void) 205 { 206 remap_ops = &intel_irq_remap_ops; 207 208 #ifdef CONFIG_AMD_IOMMU 209 if (amd_iommu_irq_ops.prepare() == 0) 210 remap_ops = &amd_iommu_irq_ops; 211 #endif 212 } 213 214 void set_irq_remapping_broken(void) 215 { 216 irq_remap_broken = 1; 217 } 218 219 int irq_remapping_supported(void) 220 { 221 if (disable_irq_remap) 222 return 0; 223 224 if (!remap_ops || !remap_ops->supported) 225 return 0; 226 227 return remap_ops->supported(); 228 } 229 230 int __init irq_remapping_prepare(void) 231 { 232 if (!remap_ops || !remap_ops->prepare) 233 return -ENODEV; 234 235 return remap_ops->prepare(); 236 } 237 238 int __init irq_remapping_enable(void) 239 { 240 int ret; 241 242 if (!remap_ops || !remap_ops->enable) 243 return -ENODEV; 244 245 ret = remap_ops->enable(); 246 247 if (irq_remapping_enabled) 248 irq_remapping_modify_x86_ops(); 249 250 return ret; 251 } 252 253 void irq_remapping_disable(void) 254 { 255 if (!irq_remapping_enabled || 256 !remap_ops || 257 !remap_ops->disable) 258 return; 259 260 remap_ops->disable(); 261 } 262 263 int irq_remapping_reenable(int mode) 264 { 265 if (!irq_remapping_enabled || 266 !remap_ops || 267 !remap_ops->reenable) 268 return 0; 269 270 return remap_ops->reenable(mode); 271 } 272 273 int __init irq_remap_enable_fault_handling(void) 274 { 275 if (!irq_remapping_enabled) 276 return 0; 277 278 if (!remap_ops || !remap_ops->enable_faulting) 279 return -ENODEV; 280 281 return remap_ops->enable_faulting(); 282 } 283 284 int setup_ioapic_remapped_entry(int irq, 285 struct IO_APIC_route_entry *entry, 286 unsigned int destination, int vector, 287 struct io_apic_irq_attr *attr) 288 { 289 if (!remap_ops || !remap_ops->setup_ioapic_entry) 290 return -ENODEV; 291 292 return remap_ops->setup_ioapic_entry(irq, entry, destination, 293 vector, attr); 294 } 295 296 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask, 297 bool force) 298 { 299 if (!config_enabled(CONFIG_SMP) || !remap_ops || 300 !remap_ops->set_affinity) 301 return 0; 302 303 return remap_ops->set_affinity(data, mask, force); 304 } 305 306 void free_remapped_irq(int irq) 307 { 308 struct irq_cfg *cfg = irq_get_chip_data(irq); 309 310 if (!remap_ops || !remap_ops->free_irq) 311 return; 312 313 if (irq_remapped(cfg)) 314 remap_ops->free_irq(irq); 315 } 316 317 void compose_remapped_msi_msg(struct pci_dev *pdev, 318 unsigned int irq, unsigned int dest, 319 struct msi_msg *msg, u8 hpet_id) 320 { 321 struct irq_cfg *cfg = irq_get_chip_data(irq); 322 323 if (!irq_remapped(cfg)) 324 native_compose_msi_msg(pdev, irq, dest, msg, hpet_id); 325 else if (remap_ops && remap_ops->compose_msi_msg) 326 remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id); 327 } 328 329 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec) 330 { 331 if (!remap_ops || !remap_ops->msi_alloc_irq) 332 return -ENODEV; 333 334 return remap_ops->msi_alloc_irq(pdev, irq, nvec); 335 } 336 337 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq, 338 int index, int sub_handle) 339 { 340 if (!remap_ops || !remap_ops->msi_setup_irq) 341 return -ENODEV; 342 343 return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle); 344 } 345 346 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id) 347 { 348 if (!remap_ops || !remap_ops->setup_hpet_msi) 349 return -ENODEV; 350 351 return remap_ops->setup_hpet_msi(irq, id); 352 } 353 354 void panic_if_irq_remap(const char *msg) 355 { 356 if (irq_remapping_enabled) 357 panic(msg); 358 } 359 360 static void ir_ack_apic_edge(struct irq_data *data) 361 { 362 ack_APIC_irq(); 363 } 364 365 static void ir_ack_apic_level(struct irq_data *data) 366 { 367 ack_APIC_irq(); 368 eoi_ioapic_irq(data->irq, data->chip_data); 369 } 370 371 static void ir_print_prefix(struct irq_data *data, struct seq_file *p) 372 { 373 seq_printf(p, " IR-%s", data->chip->name); 374 } 375 376 void irq_remap_modify_chip_defaults(struct irq_chip *chip) 377 { 378 chip->irq_print_chip = ir_print_prefix; 379 chip->irq_ack = ir_ack_apic_edge; 380 chip->irq_eoi = ir_ack_apic_level; 381 chip->irq_set_affinity = x86_io_apic_ops.set_affinity; 382 } 383 384 bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip) 385 { 386 if (!irq_remapped(cfg)) 387 return false; 388 irq_set_status_flags(irq, IRQ_MOVE_PCNTXT); 389 irq_remap_modify_chip_defaults(chip); 390 return true; 391 } 392