1 #include <linux/cpumask.h>
2 #include <linux/kernel.h>
3 #include <linux/string.h>
4 #include <linux/cpumask.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 void irq_remapping_disable_io_apic(void)
36 * With interrupt-remapping, for now we will use virtual wire A
37 * mode, as virtual wire B is little complex (need to configure
38 * both IOAPIC RTE as well as interrupt-remapping table entry).
39 * As this gets called during crash dump, keep this simple for
42 if (cpu_has_apic || apic_from_smp_config())
43 disconnect_bsp_APIC(0);
46 static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
48 int node, ret, sub_handle, index = 0;
50 struct msi_desc *msidesc;
52 nvec = __roundup_pow_of_two(nvec);
54 WARN_ON(!list_is_singular(&dev->msi_list));
55 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
56 WARN_ON(msidesc->irq);
57 WARN_ON(msidesc->msi_attrib.multiple);
59 node = dev_to_node(&dev->dev);
60 irq = __create_irqs(get_nr_irqs_gsi(), nvec, node);
64 msidesc->msi_attrib.multiple = ilog2(nvec);
65 for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
67 index = msi_alloc_remapped_irq(dev, irq, nvec);
73 ret = msi_setup_remapped_irq(dev, irq + sub_handle,
78 ret = setup_msi_irq(dev, msidesc, irq, sub_handle);
85 destroy_irqs(irq, nvec);
88 * Restore altered MSI descriptor fields and prevent just destroyed
89 * IRQs from tearing down again in default_teardown_msi_irqs()
92 msidesc->msi_attrib.multiple = 0;
97 static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
99 int node, ret, sub_handle, index = 0;
100 struct msi_desc *msidesc;
103 node = dev_to_node(&dev->dev);
104 irq = get_nr_irqs_gsi();
107 list_for_each_entry(msidesc, &dev->msi_list, list) {
109 irq = create_irq_nr(irq, node);
114 ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
116 ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
121 ret = setup_msi_irq(dev, msidesc, irq, 0);
136 static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
139 if (type == PCI_CAP_ID_MSI)
140 return do_setup_msi_irqs(dev, nvec);
142 return do_setup_msix_irqs(dev, nvec);
145 static void __init irq_remapping_modify_x86_ops(void)
147 x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
148 x86_io_apic_ops.set_affinity = set_remapped_irq_affinity;
149 x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry;
150 x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs;
151 x86_msi.setup_hpet_msi = setup_hpet_msi_remapped;
154 static __init int setup_nointremap(char *str)
156 disable_irq_remap = 1;
159 early_param("nointremap", setup_nointremap);
161 static __init int setup_irqremap(char *str)
167 if (!strncmp(str, "on", 2))
168 disable_irq_remap = 0;
169 else if (!strncmp(str, "off", 3))
170 disable_irq_remap = 1;
171 else if (!strncmp(str, "nosid", 5))
172 disable_sourceid_checking = 1;
173 else if (!strncmp(str, "no_x2apic_optout", 16))
174 no_x2apic_optout = 1;
176 str += strcspn(str, ",");
183 early_param("intremap", setup_irqremap);
185 void __init setup_irq_remapping_ops(void)
187 remap_ops = &intel_irq_remap_ops;
189 #ifdef CONFIG_AMD_IOMMU
190 if (amd_iommu_irq_ops.prepare() == 0)
191 remap_ops = &amd_iommu_irq_ops;
195 int irq_remapping_supported(void)
197 if (disable_irq_remap)
200 if (!remap_ops || !remap_ops->supported)
203 return remap_ops->supported();
206 int __init irq_remapping_prepare(void)
208 if (!remap_ops || !remap_ops->prepare)
211 return remap_ops->prepare();
214 int __init irq_remapping_enable(void)
218 if (!remap_ops || !remap_ops->enable)
221 ret = remap_ops->enable();
223 if (irq_remapping_enabled)
224 irq_remapping_modify_x86_ops();
229 void irq_remapping_disable(void)
231 if (!irq_remapping_enabled ||
236 remap_ops->disable();
239 int irq_remapping_reenable(int mode)
241 if (!irq_remapping_enabled ||
243 !remap_ops->reenable)
246 return remap_ops->reenable(mode);
249 int __init irq_remap_enable_fault_handling(void)
251 if (!irq_remapping_enabled)
254 if (!remap_ops || !remap_ops->enable_faulting)
257 return remap_ops->enable_faulting();
260 int setup_ioapic_remapped_entry(int irq,
261 struct IO_APIC_route_entry *entry,
262 unsigned int destination, int vector,
263 struct io_apic_irq_attr *attr)
265 if (!remap_ops || !remap_ops->setup_ioapic_entry)
268 return remap_ops->setup_ioapic_entry(irq, entry, destination,
272 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
275 if (!config_enabled(CONFIG_SMP) || !remap_ops ||
276 !remap_ops->set_affinity)
279 return remap_ops->set_affinity(data, mask, force);
282 void free_remapped_irq(int irq)
284 if (!remap_ops || !remap_ops->free_irq)
287 remap_ops->free_irq(irq);
290 void compose_remapped_msi_msg(struct pci_dev *pdev,
291 unsigned int irq, unsigned int dest,
292 struct msi_msg *msg, u8 hpet_id)
294 if (!remap_ops || !remap_ops->compose_msi_msg)
297 remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
300 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
302 if (!remap_ops || !remap_ops->msi_alloc_irq)
305 return remap_ops->msi_alloc_irq(pdev, irq, nvec);
308 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
309 int index, int sub_handle)
311 if (!remap_ops || !remap_ops->msi_setup_irq)
314 return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
317 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
319 if (!remap_ops || !remap_ops->setup_hpet_msi)
322 return remap_ops->setup_hpet_msi(irq, id);
325 void panic_if_irq_remap(const char *msg)
327 if (irq_remapping_enabled)