1 #include <linux/seq_file.h>
2 #include <linux/cpumask.h>
3 #include <linux/kernel.h>
4 #include <linux/string.h>
5 #include <linux/cpumask.h>
6 #include <linux/errno.h>
11 #include <asm/hw_irq.h>
12 #include <asm/irq_remapping.h>
13 #include <asm/processor.h>
14 #include <asm/x86_init.h>
17 #include "irq_remapping.h"
19 int irq_remapping_enabled;
21 int disable_irq_remap;
22 int disable_sourceid_checking;
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 node, ret, sub_handle, index = 0;
56 struct msi_desc *msidesc;
58 nvec = __roundup_pow_of_two(nvec);
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);
65 node = dev_to_node(&dev->dev);
66 irq = __create_irqs(get_nr_irqs_gsi(), nvec, node);
70 msidesc->msi_attrib.multiple = ilog2(nvec);
71 for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
73 index = msi_alloc_remapped_irq(dev, irq, nvec);
79 ret = msi_setup_remapped_irq(dev, irq + sub_handle,
84 ret = setup_msi_irq(dev, msidesc, irq, sub_handle);
91 destroy_irqs(irq, nvec);
94 * Restore altered MSI descriptor fields and prevent just destroyed
95 * IRQs from tearing down again in default_teardown_msi_irqs()
98 msidesc->msi_attrib.multiple = 0;
103 static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
105 int node, ret, sub_handle, index = 0;
106 struct msi_desc *msidesc;
109 node = dev_to_node(&dev->dev);
110 irq = get_nr_irqs_gsi();
113 list_for_each_entry(msidesc, &dev->msi_list, list) {
115 irq = create_irq_nr(irq, node);
120 ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
122 ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
127 ret = setup_msi_irq(dev, msidesc, irq, 0);
142 static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
145 if (type == PCI_CAP_ID_MSI)
146 return do_setup_msi_irqs(dev, nvec);
148 return do_setup_msix_irqs(dev, nvec);
151 void eoi_ioapic_pin_remapped(int apic, int pin, int vector)
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.
159 io_apic_eoi(apic, pin);
162 static void __init irq_remapping_modify_x86_ops(void)
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;
173 static __init int setup_nointremap(char *str)
175 disable_irq_remap = 1;
178 early_param("nointremap", setup_nointremap);
180 static __init int setup_irqremap(char *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;
195 str += strcspn(str, ",");
202 early_param("intremap", setup_irqremap);
204 void __init setup_irq_remapping_ops(void)
206 remap_ops = &intel_irq_remap_ops;
208 #ifdef CONFIG_AMD_IOMMU
209 if (amd_iommu_irq_ops.prepare() == 0)
210 remap_ops = &amd_iommu_irq_ops;
214 int irq_remapping_supported(void)
216 if (disable_irq_remap)
219 if (!remap_ops || !remap_ops->supported)
222 return remap_ops->supported();
225 int __init irq_remapping_prepare(void)
227 if (!remap_ops || !remap_ops->prepare)
230 return remap_ops->prepare();
233 int __init irq_remapping_enable(void)
237 if (!remap_ops || !remap_ops->enable)
240 ret = remap_ops->enable();
242 if (irq_remapping_enabled)
243 irq_remapping_modify_x86_ops();
248 void irq_remapping_disable(void)
250 if (!irq_remapping_enabled ||
255 remap_ops->disable();
258 int irq_remapping_reenable(int mode)
260 if (!irq_remapping_enabled ||
262 !remap_ops->reenable)
265 return remap_ops->reenable(mode);
268 int __init irq_remap_enable_fault_handling(void)
270 if (!irq_remapping_enabled)
273 if (!remap_ops || !remap_ops->enable_faulting)
276 return remap_ops->enable_faulting();
279 int setup_ioapic_remapped_entry(int irq,
280 struct IO_APIC_route_entry *entry,
281 unsigned int destination, int vector,
282 struct io_apic_irq_attr *attr)
284 if (!remap_ops || !remap_ops->setup_ioapic_entry)
287 return remap_ops->setup_ioapic_entry(irq, entry, destination,
291 int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
294 if (!config_enabled(CONFIG_SMP) || !remap_ops ||
295 !remap_ops->set_affinity)
298 return remap_ops->set_affinity(data, mask, force);
301 void free_remapped_irq(int irq)
303 struct irq_cfg *cfg = irq_get_chip_data(irq);
305 if (!remap_ops || !remap_ops->free_irq)
308 if (irq_remapped(cfg))
309 remap_ops->free_irq(irq);
312 void compose_remapped_msi_msg(struct pci_dev *pdev,
313 unsigned int irq, unsigned int dest,
314 struct msi_msg *msg, u8 hpet_id)
316 struct irq_cfg *cfg = irq_get_chip_data(irq);
318 if (!irq_remapped(cfg))
319 native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
320 else if (remap_ops && remap_ops->compose_msi_msg)
321 remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
324 static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
326 if (!remap_ops || !remap_ops->msi_alloc_irq)
329 return remap_ops->msi_alloc_irq(pdev, irq, nvec);
332 static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
333 int index, int sub_handle)
335 if (!remap_ops || !remap_ops->msi_setup_irq)
338 return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
341 int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
343 if (!remap_ops || !remap_ops->setup_hpet_msi)
346 return remap_ops->setup_hpet_msi(irq, id);
349 void panic_if_irq_remap(const char *msg)
351 if (irq_remapping_enabled)
355 static void ir_ack_apic_edge(struct irq_data *data)
360 static void ir_ack_apic_level(struct irq_data *data)
363 eoi_ioapic_irq(data->irq, data->chip_data);
366 static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
368 seq_printf(p, " IR-%s", data->chip->name);
371 void irq_remap_modify_chip_defaults(struct irq_chip *chip)
373 chip->irq_print_chip = ir_print_prefix;
374 chip->irq_ack = ir_ack_apic_edge;
375 chip->irq_eoi = ir_ack_apic_level;
376 chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
379 bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
381 if (!irq_remapped(cfg))
383 irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
384 irq_remap_modify_chip_defaults(chip);