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_irq_remap;
23 int disable_sourceid_checking;
26 static struct irq_remap_ops *remap_ops;
28 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);
29 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
30 int index, int sub_handle);
31 static int set_remapped_irq_affinity(struct irq_data *data,
32 const struct cpumask *mask,
35 static bool irq_remapped(struct irq_cfg *cfg)
37 return (cfg->remapped == 1);
40 static void irq_remapping_disable_io_apic(void)
43 * With interrupt-remapping, for now we will use virtual wire A
44 * mode, as virtual wire B is little complex (need to configure
45 * both IOAPIC RTE as well as interrupt-remapping table entry).
46 * As this gets called during crash dump, keep this simple for
49 if (cpu_has_apic || apic_from_smp_config())
50 disconnect_bsp_APIC(0);
53 static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
55 int ret, sub_handle, nvec_pow2, index = 0;
57 struct msi_desc *msidesc;
59 msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
61 irq = irq_alloc_hwirqs(nvec, dev_to_node(&dev->dev));
65 nvec_pow2 = __roundup_pow_of_two(nvec);
66 for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
68 index = msi_alloc_remapped_irq(dev, irq, nvec_pow2);
74 ret = msi_setup_remapped_irq(dev, irq + sub_handle,
79 ret = setup_msi_irq(dev, msidesc, irq, sub_handle);
86 irq_free_hwirqs(irq, nvec);
89 * Restore altered MSI descriptor fields and prevent just destroyed
90 * IRQs from tearing down again in default_teardown_msi_irqs()
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);
106 list_for_each_entry(msidesc, &dev->msi_list, list) {
108 irq = irq_alloc_hwirq(node);
113 ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
115 ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
120 ret = setup_msi_irq(dev, msidesc, irq, 0);
135 static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
138 if (type == PCI_CAP_ID_MSI)
139 return do_setup_msi_irqs(dev, nvec);
141 return do_setup_msix_irqs(dev, nvec);
144 static void eoi_ioapic_pin_remapped(int apic, int pin, int vector)
147 * Intr-remapping uses pin number as the virtual vector
148 * in the RTE. Actual vector is programmed in
149 * intr-remapping table entry. Hence for the io-apic
150 * EOI we use the pin number.
152 io_apic_eoi(apic, pin);
155 static void __init irq_remapping_modify_x86_ops(void)
157 x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
158 x86_io_apic_ops.set_affinity = set_remapped_irq_affinity;
159 x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry;
160 x86_io_apic_ops.eoi_ioapic_pin = eoi_ioapic_pin_remapped;
161 x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs;
162 x86_msi.setup_hpet_msi = setup_hpet_msi_remapped;
163 x86_msi.compose_msi_msg = compose_remapped_msi_msg;
166 static __init int setup_nointremap(char *str)
168 disable_irq_remap = 1;
171 early_param("nointremap", setup_nointremap);
173 static __init int setup_irqremap(char *str)
179 if (!strncmp(str, "on", 2))
180 disable_irq_remap = 0;
181 else if (!strncmp(str, "off", 3))
182 disable_irq_remap = 1;
183 else if (!strncmp(str, "nosid", 5))
184 disable_sourceid_checking = 1;
185 else if (!strncmp(str, "no_x2apic_optout", 16))
186 no_x2apic_optout = 1;
188 str += strcspn(str, ",");
195 early_param("intremap", setup_irqremap);
197 void __init setup_irq_remapping_ops(void)
199 remap_ops = &intel_irq_remap_ops;
201 #ifdef CONFIG_AMD_IOMMU
202 if (amd_iommu_irq_ops.prepare() == 0)
203 remap_ops = &amd_iommu_irq_ops;
207 void set_irq_remapping_broken(void)
209 irq_remap_broken = 1;
212 int irq_remapping_supported(void)
214 if (disable_irq_remap)
217 if (!remap_ops || !remap_ops->supported)
220 return remap_ops->supported();
223 int __init irq_remapping_prepare(void)
225 if (!remap_ops || !remap_ops->prepare)
228 return remap_ops->prepare();
231 int __init irq_remapping_enable(void)
235 if (!remap_ops || !remap_ops->enable)
238 ret = remap_ops->enable();
240 if (irq_remapping_enabled)
241 irq_remapping_modify_x86_ops();
246 void irq_remapping_disable(void)
248 if (!irq_remapping_enabled ||
253 remap_ops->disable();
256 int irq_remapping_reenable(int mode)
258 if (!irq_remapping_enabled ||
260 !remap_ops->reenable)
263 return remap_ops->reenable(mode);
266 int __init irq_remap_enable_fault_handling(void)
268 if (!irq_remapping_enabled)
271 if (!remap_ops || !remap_ops->enable_faulting)
274 return remap_ops->enable_faulting();
277 int setup_ioapic_remapped_entry(int irq,
278 struct IO_APIC_route_entry *entry,
279 unsigned int destination, int vector,
280 struct io_apic_irq_attr *attr)
282 if (!remap_ops || !remap_ops->setup_ioapic_entry)
285 return remap_ops->setup_ioapic_entry(irq, entry, destination,
289 static int set_remapped_irq_affinity(struct irq_data *data,
290 const struct cpumask *mask, bool force)
292 if (!config_enabled(CONFIG_SMP) || !remap_ops ||
293 !remap_ops->set_affinity)
296 return remap_ops->set_affinity(data, mask, force);
299 void free_remapped_irq(int irq)
301 struct irq_cfg *cfg = irq_get_chip_data(irq);
303 if (!remap_ops || !remap_ops->free_irq)
306 if (irq_remapped(cfg))
307 remap_ops->free_irq(irq);
310 void compose_remapped_msi_msg(struct pci_dev *pdev,
311 unsigned int irq, unsigned int dest,
312 struct msi_msg *msg, u8 hpet_id)
314 struct irq_cfg *cfg = irq_get_chip_data(irq);
316 if (!irq_remapped(cfg))
317 native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
318 else if (remap_ops && remap_ops->compose_msi_msg)
319 remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
322 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
324 if (!remap_ops || !remap_ops->msi_alloc_irq)
327 return remap_ops->msi_alloc_irq(pdev, irq, nvec);
330 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
331 int index, int sub_handle)
333 if (!remap_ops || !remap_ops->msi_setup_irq)
336 return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
339 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
343 if (!remap_ops || !remap_ops->alloc_hpet_msi)
346 ret = remap_ops->alloc_hpet_msi(irq, id);
350 return default_setup_hpet_msi(irq, id);
353 void panic_if_irq_remap(const char *msg)
355 if (irq_remapping_enabled)
359 static void ir_ack_apic_edge(struct irq_data *data)
364 static void ir_ack_apic_level(struct irq_data *data)
367 eoi_ioapic_irq(data->irq, data->chip_data);
370 static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
372 seq_printf(p, " IR-%s", data->chip->name);
375 void irq_remap_modify_chip_defaults(struct irq_chip *chip)
377 chip->irq_print_chip = ir_print_prefix;
378 chip->irq_ack = ir_ack_apic_edge;
379 chip->irq_eoi = ir_ack_apic_level;
380 chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
383 bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
385 if (!irq_remapped(cfg))
387 irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
388 irq_remap_modify_chip_defaults(chip);