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>
17 #include "irq_remapping.h"
19 int irq_remapping_enabled;
21 int disable_sourceid_checking;
24 static int disable_irq_remap;
25 static struct irq_remap_ops *remap_ops;
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,
34 static bool irq_remapped(struct irq_cfg *cfg)
36 return (cfg->remapped == 1);
39 static void irq_remapping_disable_io_apic(void)
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
48 if (cpu_has_apic || apic_from_smp_config())
49 disconnect_bsp_APIC(0);
52 static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
54 int ret, sub_handle, nvec_pow2, index = 0;
56 struct msi_desc *msidesc;
58 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
60 irq = irq_alloc_hwirqs(nvec, dev_to_node(&dev->dev));
64 nvec_pow2 = __roundup_pow_of_two(nvec);
65 for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
67 index = msi_alloc_remapped_irq(dev, irq, nvec_pow2);
73 ret = msi_setup_remapped_irq(dev, irq + sub_handle,
78 ret = setup_msi_irq(dev, msidesc, irq, sub_handle);
85 irq_free_hwirqs(irq, nvec);
88 * Restore altered MSI descriptor fields and prevent just destroyed
89 * IRQs from tearing down again in default_teardown_msi_irqs()
96 static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
98 int node, ret, sub_handle, index = 0;
99 struct msi_desc *msidesc;
102 node = dev_to_node(&dev->dev);
105 list_for_each_entry(msidesc, &dev->msi_list, list) {
107 irq = irq_alloc_hwirq(node);
112 ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
114 ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
119 ret = setup_msi_irq(dev, msidesc, irq, 0);
134 static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
137 if (type == PCI_CAP_ID_MSI)
138 return do_setup_msi_irqs(dev, nvec);
140 return do_setup_msix_irqs(dev, nvec);
143 static void eoi_ioapic_pin_remapped(int apic, int pin, int vector)
146 * Intr-remapping uses pin number as the virtual vector
147 * in the RTE. Actual vector is programmed in
148 * intr-remapping table entry. Hence for the io-apic
149 * EOI we use the pin number.
151 io_apic_eoi(apic, pin);
154 static void __init irq_remapping_modify_x86_ops(void)
156 x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
157 x86_io_apic_ops.set_affinity = set_remapped_irq_affinity;
158 x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry;
159 x86_io_apic_ops.eoi_ioapic_pin = eoi_ioapic_pin_remapped;
160 x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs;
161 x86_msi.setup_hpet_msi = setup_hpet_msi_remapped;
162 x86_msi.compose_msi_msg = compose_remapped_msi_msg;
165 static __init int setup_nointremap(char *str)
167 disable_irq_remap = 1;
170 early_param("nointremap", setup_nointremap);
172 static __init int setup_irqremap(char *str)
178 if (!strncmp(str, "on", 2))
179 disable_irq_remap = 0;
180 else if (!strncmp(str, "off", 3))
181 disable_irq_remap = 1;
182 else if (!strncmp(str, "nosid", 5))
183 disable_sourceid_checking = 1;
184 else if (!strncmp(str, "no_x2apic_optout", 16))
185 no_x2apic_optout = 1;
187 str += strcspn(str, ",");
194 early_param("intremap", setup_irqremap);
196 void set_irq_remapping_broken(void)
198 irq_remap_broken = 1;
201 int __init irq_remapping_prepare(void)
203 if (disable_irq_remap)
206 if (intel_irq_remap_ops.prepare() == 0)
207 remap_ops = &intel_irq_remap_ops;
208 else if (IS_ENABLED(CONFIG_AMD_IOMMU) &&
209 amd_iommu_irq_ops.prepare() == 0)
210 remap_ops = &amd_iommu_irq_ops;
217 int __init irq_remapping_enable(void)
221 if (!remap_ops->enable)
224 ret = remap_ops->enable();
226 if (irq_remapping_enabled)
227 irq_remapping_modify_x86_ops();
232 void irq_remapping_disable(void)
234 if (irq_remapping_enabled && remap_ops->disable)
235 remap_ops->disable();
238 int irq_remapping_reenable(int mode)
240 if (irq_remapping_enabled && remap_ops->reenable)
241 return remap_ops->reenable(mode);
246 int __init irq_remap_enable_fault_handling(void)
248 if (!irq_remapping_enabled)
251 if (!remap_ops->enable_faulting)
254 return remap_ops->enable_faulting();
257 int setup_ioapic_remapped_entry(int irq,
258 struct IO_APIC_route_entry *entry,
259 unsigned int destination, int vector,
260 struct io_apic_irq_attr *attr)
262 if (!remap_ops->setup_ioapic_entry)
265 return remap_ops->setup_ioapic_entry(irq, entry, destination,
269 static int set_remapped_irq_affinity(struct irq_data *data,
270 const struct cpumask *mask, bool force)
272 if (!config_enabled(CONFIG_SMP) || !remap_ops->set_affinity)
275 return remap_ops->set_affinity(data, mask, force);
278 void free_remapped_irq(int irq)
280 struct irq_cfg *cfg = irq_cfg(irq);
282 if (irq_remapped(cfg) && remap_ops->free_irq)
283 remap_ops->free_irq(irq);
286 void compose_remapped_msi_msg(struct pci_dev *pdev,
287 unsigned int irq, unsigned int dest,
288 struct msi_msg *msg, u8 hpet_id)
290 struct irq_cfg *cfg = irq_cfg(irq);
292 if (!irq_remapped(cfg))
293 native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
294 else if (remap_ops->compose_msi_msg)
295 remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
298 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
300 if (!remap_ops->msi_alloc_irq)
303 return remap_ops->msi_alloc_irq(pdev, irq, nvec);
306 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
307 int index, int sub_handle)
309 if (!remap_ops->msi_setup_irq)
312 return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
315 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
319 if (!remap_ops->alloc_hpet_msi)
322 ret = remap_ops->alloc_hpet_msi(irq, id);
326 return default_setup_hpet_msi(irq, id);
329 void panic_if_irq_remap(const char *msg)
331 if (irq_remapping_enabled)
335 static void ir_ack_apic_edge(struct irq_data *data)
340 static void ir_ack_apic_level(struct irq_data *data)
343 eoi_ioapic_irq(data->irq, irqd_cfg(data));
346 static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
348 seq_printf(p, " IR-%s", data->chip->name);
351 void irq_remap_modify_chip_defaults(struct irq_chip *chip)
353 chip->irq_print_chip = ir_print_prefix;
354 chip->irq_ack = ir_ack_apic_edge;
355 chip->irq_eoi = ir_ack_apic_level;
356 chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
359 bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
361 if (!irq_remapped(cfg))
363 irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
364 irq_remap_modify_chip_defaults(chip);