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>
10 #include <asm/hw_irq.h>
11 #include <asm/irq_remapping.h>
12 #include <asm/processor.h>
13 #include <asm/x86_init.h>
16 #include "irq_remapping.h"
18 int irq_remapping_enabled;
20 int disable_irq_remap;
21 int disable_sourceid_checking;
24 static struct irq_remap_ops *remap_ops;
26 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);
27 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
28 int index, int sub_handle);
29 static int set_remapped_irq_affinity(struct irq_data *data,
30 const struct cpumask *mask,
33 static bool irq_remapped(struct irq_cfg *cfg)
35 return (cfg->remapped == 1);
38 static void irq_remapping_disable_io_apic(void)
41 * With interrupt-remapping, for now we will use virtual wire A
42 * mode, as virtual wire B is little complex (need to configure
43 * both IOAPIC RTE as well as interrupt-remapping table entry).
44 * As this gets called during crash dump, keep this simple for
47 if (cpu_has_apic || apic_from_smp_config())
48 disconnect_bsp_APIC(0);
51 static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
53 int node, ret, sub_handle, index = 0;
55 struct msi_desc *msidesc;
57 nvec = __roundup_pow_of_two(nvec);
59 WARN_ON(!list_is_singular(&dev->msi_list));
60 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
61 WARN_ON(msidesc->irq);
62 WARN_ON(msidesc->msi_attrib.multiple);
64 node = dev_to_node(&dev->dev);
65 irq = __create_irqs(get_nr_irqs_gsi(), nvec, node);
69 msidesc->msi_attrib.multiple = ilog2(nvec);
70 for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
72 index = msi_alloc_remapped_irq(dev, irq, nvec);
78 ret = msi_setup_remapped_irq(dev, irq + sub_handle,
83 ret = setup_msi_irq(dev, msidesc, irq, sub_handle);
90 destroy_irqs(irq, nvec);
93 * Restore altered MSI descriptor fields and prevent just destroyed
94 * IRQs from tearing down again in default_teardown_msi_irqs()
97 msidesc->msi_attrib.multiple = 0;
102 static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
104 int node, ret, sub_handle, index = 0;
105 struct msi_desc *msidesc;
108 node = dev_to_node(&dev->dev);
109 irq = get_nr_irqs_gsi();
112 list_for_each_entry(msidesc, &dev->msi_list, list) {
114 irq = create_irq_nr(irq, node);
119 ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
121 ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
126 ret = setup_msi_irq(dev, msidesc, irq, 0);
141 static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
144 if (type == PCI_CAP_ID_MSI)
145 return do_setup_msi_irqs(dev, nvec);
147 return do_setup_msix_irqs(dev, nvec);
150 void eoi_ioapic_pin_remapped(int apic, int pin, int vector)
153 * Intr-remapping uses pin number as the virtual vector
154 * in the RTE. Actual vector is programmed in
155 * intr-remapping table entry. Hence for the io-apic
156 * EOI we use the pin number.
158 io_apic_eoi(apic, pin);
161 static void __init irq_remapping_modify_x86_ops(void)
163 x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
164 x86_io_apic_ops.set_affinity = set_remapped_irq_affinity;
165 x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry;
166 x86_io_apic_ops.eoi_ioapic_pin = eoi_ioapic_pin_remapped;
167 x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs;
168 x86_msi.setup_hpet_msi = setup_hpet_msi_remapped;
169 x86_msi.compose_msi_msg = compose_remapped_msi_msg;
172 static __init int setup_nointremap(char *str)
174 disable_irq_remap = 1;
177 early_param("nointremap", setup_nointremap);
179 static __init int setup_irqremap(char *str)
185 if (!strncmp(str, "on", 2))
186 disable_irq_remap = 0;
187 else if (!strncmp(str, "off", 3))
188 disable_irq_remap = 1;
189 else if (!strncmp(str, "nosid", 5))
190 disable_sourceid_checking = 1;
191 else if (!strncmp(str, "no_x2apic_optout", 16))
192 no_x2apic_optout = 1;
194 str += strcspn(str, ",");
201 early_param("intremap", setup_irqremap);
203 void __init setup_irq_remapping_ops(void)
205 remap_ops = &intel_irq_remap_ops;
207 #ifdef CONFIG_AMD_IOMMU
208 if (amd_iommu_irq_ops.prepare() == 0)
209 remap_ops = &amd_iommu_irq_ops;
213 int irq_remapping_supported(void)
215 if (disable_irq_remap)
218 if (!remap_ops || !remap_ops->supported)
221 return remap_ops->supported();
224 int __init irq_remapping_prepare(void)
226 if (!remap_ops || !remap_ops->prepare)
229 return remap_ops->prepare();
232 int __init irq_remapping_enable(void)
236 if (!remap_ops || !remap_ops->enable)
239 ret = remap_ops->enable();
241 if (irq_remapping_enabled)
242 irq_remapping_modify_x86_ops();
247 void irq_remapping_disable(void)
249 if (!irq_remapping_enabled ||
254 remap_ops->disable();
257 int irq_remapping_reenable(int mode)
259 if (!irq_remapping_enabled ||
261 !remap_ops->reenable)
264 return remap_ops->reenable(mode);
267 int __init irq_remap_enable_fault_handling(void)
269 if (!irq_remapping_enabled)
272 if (!remap_ops || !remap_ops->enable_faulting)
275 return remap_ops->enable_faulting();
278 int setup_ioapic_remapped_entry(int irq,
279 struct IO_APIC_route_entry *entry,
280 unsigned int destination, int vector,
281 struct io_apic_irq_attr *attr)
283 if (!remap_ops || !remap_ops->setup_ioapic_entry)
286 return remap_ops->setup_ioapic_entry(irq, entry, destination,
290 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
293 if (!config_enabled(CONFIG_SMP) || !remap_ops ||
294 !remap_ops->set_affinity)
297 return remap_ops->set_affinity(data, mask, force);
300 void free_remapped_irq(int irq)
302 struct irq_cfg *cfg = irq_get_chip_data(irq);
304 if (!remap_ops || !remap_ops->free_irq)
307 if (irq_remapped(cfg))
308 remap_ops->free_irq(irq);
311 void compose_remapped_msi_msg(struct pci_dev *pdev,
312 unsigned int irq, unsigned int dest,
313 struct msi_msg *msg, u8 hpet_id)
315 struct irq_cfg *cfg = irq_get_chip_data(irq);
317 if (!irq_remapped(cfg))
318 native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
319 else if (remap_ops && remap_ops->compose_msi_msg)
320 remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
323 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
325 if (!remap_ops || !remap_ops->msi_alloc_irq)
328 return remap_ops->msi_alloc_irq(pdev, irq, nvec);
331 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
332 int index, int sub_handle)
334 if (!remap_ops || !remap_ops->msi_setup_irq)
337 return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
340 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
342 if (!remap_ops || !remap_ops->setup_hpet_msi)
345 return remap_ops->setup_hpet_msi(irq, id);
348 void panic_if_irq_remap(const char *msg)
350 if (irq_remapping_enabled)
354 static void ir_ack_apic_edge(struct irq_data *data)
359 static void ir_ack_apic_level(struct irq_data *data)
362 eoi_ioapic_irq(data->irq, data->chip_data);
365 static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
367 seq_printf(p, " IR-%s", data->chip->name);
370 void irq_remap_modify_chip_defaults(struct irq_chip *chip)
372 chip->irq_print_chip = ir_print_prefix;
373 chip->irq_ack = ir_ack_apic_edge;
374 chip->irq_eoi = ir_ack_apic_level;
375 chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
378 bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
380 if (!irq_remapped(cfg))
382 irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
383 irq_remap_modify_chip_defaults(chip);