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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> | |
6 | #include <linux/msi.h> | |
7 | #include <linux/irq.h> | |
8 | #include <linux/pci.h> | |
9 | ||
10 | #include <asm/hw_irq.h> | |
11 | #include <asm/irq_remapping.h> | |
12 | #include <asm/processor.h> | |
13 | #include <asm/x86_init.h> | |
14 | #include <asm/apic.h> | |
15 | ||
16 | #include "irq_remapping.h" | |
17 | ||
18 | int irq_remapping_enabled; | |
19 | ||
20 | int disable_irq_remap; | |
21 | int irq_remap_broken; | |
22 | int disable_sourceid_checking; | |
23 | int no_x2apic_optout; | |
24 | ||
25 | static struct irq_remap_ops *remap_ops; | |
26 | ||
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, | |
32 | bool force); | |
33 | ||
34 | static bool irq_remapped(struct irq_cfg *cfg) | |
35 | { | |
36 | return (cfg->remapped == 1); | |
37 | } | |
38 | ||
39 | static void irq_remapping_disable_io_apic(void) | |
40 | { | |
41 | /* | |
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 | |
46 | * now. | |
47 | */ | |
48 | if (cpu_has_apic || apic_from_smp_config()) | |
49 | disconnect_bsp_APIC(0); | |
50 | } | |
51 | ||
52 | static int do_setup_msi_irqs(struct pci_dev *dev, int nvec) | |
53 | { | |
54 | int ret, sub_handle, nvec_pow2, index = 0; | |
55 | unsigned int irq; | |
56 | struct msi_desc *msidesc; | |
57 | ||
58 | WARN_ON(!list_is_singular(&dev->msi_list)); | |
59 | msidesc = list_entry(dev->msi_list.next, struct msi_desc, list); | |
60 | WARN_ON(msidesc->irq); | |
61 | WARN_ON(msidesc->msi_attrib.multiple); | |
62 | WARN_ON(msidesc->nvec_used); | |
63 | ||
64 | irq = irq_alloc_hwirqs(nvec, dev_to_node(&dev->dev)); | |
65 | if (irq == 0) | |
66 | return -ENOSPC; | |
67 | ||
68 | nvec_pow2 = __roundup_pow_of_two(nvec); | |
69 | msidesc->nvec_used = nvec; | |
70 | msidesc->msi_attrib.multiple = ilog2(nvec_pow2); | |
71 | for (sub_handle = 0; sub_handle < nvec; sub_handle++) { | |
72 | if (!sub_handle) { | |
73 | index = msi_alloc_remapped_irq(dev, irq, nvec_pow2); | |
74 | if (index < 0) { | |
75 | ret = index; | |
76 | goto error; | |
77 | } | |
78 | } else { | |
79 | ret = msi_setup_remapped_irq(dev, irq + sub_handle, | |
80 | index, sub_handle); | |
81 | if (ret < 0) | |
82 | goto error; | |
83 | } | |
84 | ret = setup_msi_irq(dev, msidesc, irq, sub_handle); | |
85 | if (ret < 0) | |
86 | goto error; | |
87 | } | |
88 | return 0; | |
89 | ||
90 | error: | |
91 | irq_free_hwirqs(irq, nvec); | |
92 | ||
93 | /* | |
94 | * Restore altered MSI descriptor fields and prevent just destroyed | |
95 | * IRQs from tearing down again in default_teardown_msi_irqs() | |
96 | */ | |
97 | msidesc->irq = 0; | |
98 | msidesc->nvec_used = 0; | |
99 | msidesc->msi_attrib.multiple = 0; | |
100 | ||
101 | return ret; | |
102 | } | |
103 | ||
104 | static int do_setup_msix_irqs(struct pci_dev *dev, int nvec) | |
105 | { | |
106 | int node, ret, sub_handle, index = 0; | |
107 | struct msi_desc *msidesc; | |
108 | unsigned int irq; | |
109 | ||
110 | node = dev_to_node(&dev->dev); | |
111 | sub_handle = 0; | |
112 | ||
113 | list_for_each_entry(msidesc, &dev->msi_list, list) { | |
114 | ||
115 | irq = irq_alloc_hwirq(node); | |
116 | if (irq == 0) | |
117 | return -1; | |
118 | ||
119 | if (sub_handle == 0) | |
120 | ret = index = msi_alloc_remapped_irq(dev, irq, nvec); | |
121 | else | |
122 | ret = msi_setup_remapped_irq(dev, irq, index, sub_handle); | |
123 | ||
124 | if (ret < 0) | |
125 | goto error; | |
126 | ||
127 | ret = setup_msi_irq(dev, msidesc, irq, 0); | |
128 | if (ret < 0) | |
129 | goto error; | |
130 | ||
131 | sub_handle += 1; | |
132 | irq += 1; | |
133 | } | |
134 | ||
135 | return 0; | |
136 | ||
137 | error: | |
138 | irq_free_hwirq(irq); | |
139 | return ret; | |
140 | } | |
141 | ||
142 | static int irq_remapping_setup_msi_irqs(struct pci_dev *dev, | |
143 | int nvec, int type) | |
144 | { | |
145 | if (type == PCI_CAP_ID_MSI) | |
146 | return do_setup_msi_irqs(dev, nvec); | |
147 | else | |
148 | return do_setup_msix_irqs(dev, nvec); | |
149 | } | |
150 | ||
151 | static void eoi_ioapic_pin_remapped(int apic, int pin, int vector) | |
152 | { | |
153 | /* | |
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. | |
158 | */ | |
159 | io_apic_eoi(apic, pin); | |
160 | } | |
161 | ||
162 | static void __init irq_remapping_modify_x86_ops(void) | |
163 | { | |
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; | |
171 | } | |
172 | ||
173 | static __init int setup_nointremap(char *str) | |
174 | { | |
175 | disable_irq_remap = 1; | |
176 | return 0; | |
177 | } | |
178 | early_param("nointremap", setup_nointremap); | |
179 | ||
180 | static __init int setup_irqremap(char *str) | |
181 | { | |
182 | if (!str) | |
183 | return -EINVAL; | |
184 | ||
185 | while (*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; | |
194 | ||
195 | str += strcspn(str, ","); | |
196 | while (*str == ',') | |
197 | str++; | |
198 | } | |
199 | ||
200 | return 0; | |
201 | } | |
202 | early_param("intremap", setup_irqremap); | |
203 | ||
204 | void __init setup_irq_remapping_ops(void) | |
205 | { | |
206 | remap_ops = &intel_irq_remap_ops; | |
207 | ||
208 | #ifdef CONFIG_AMD_IOMMU | |
209 | if (amd_iommu_irq_ops.prepare() == 0) | |
210 | remap_ops = &amd_iommu_irq_ops; | |
211 | #endif | |
212 | } | |
213 | ||
214 | void set_irq_remapping_broken(void) | |
215 | { | |
216 | irq_remap_broken = 1; | |
217 | } | |
218 | ||
219 | int irq_remapping_supported(void) | |
220 | { | |
221 | if (disable_irq_remap) | |
222 | return 0; | |
223 | ||
224 | if (!remap_ops || !remap_ops->supported) | |
225 | return 0; | |
226 | ||
227 | return remap_ops->supported(); | |
228 | } | |
229 | ||
230 | int __init irq_remapping_prepare(void) | |
231 | { | |
232 | if (!remap_ops || !remap_ops->prepare) | |
233 | return -ENODEV; | |
234 | ||
235 | return remap_ops->prepare(); | |
236 | } | |
237 | ||
238 | int __init irq_remapping_enable(void) | |
239 | { | |
240 | int ret; | |
241 | ||
242 | if (!remap_ops || !remap_ops->enable) | |
243 | return -ENODEV; | |
244 | ||
245 | ret = remap_ops->enable(); | |
246 | ||
247 | if (irq_remapping_enabled) | |
248 | irq_remapping_modify_x86_ops(); | |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
253 | void irq_remapping_disable(void) | |
254 | { | |
255 | if (!irq_remapping_enabled || | |
256 | !remap_ops || | |
257 | !remap_ops->disable) | |
258 | return; | |
259 | ||
260 | remap_ops->disable(); | |
261 | } | |
262 | ||
263 | int irq_remapping_reenable(int mode) | |
264 | { | |
265 | if (!irq_remapping_enabled || | |
266 | !remap_ops || | |
267 | !remap_ops->reenable) | |
268 | return 0; | |
269 | ||
270 | return remap_ops->reenable(mode); | |
271 | } | |
272 | ||
273 | int __init irq_remap_enable_fault_handling(void) | |
274 | { | |
275 | if (!irq_remapping_enabled) | |
276 | return 0; | |
277 | ||
278 | if (!remap_ops || !remap_ops->enable_faulting) | |
279 | return -ENODEV; | |
280 | ||
281 | return remap_ops->enable_faulting(); | |
282 | } | |
283 | ||
284 | int setup_ioapic_remapped_entry(int irq, | |
285 | struct IO_APIC_route_entry *entry, | |
286 | unsigned int destination, int vector, | |
287 | struct io_apic_irq_attr *attr) | |
288 | { | |
289 | if (!remap_ops || !remap_ops->setup_ioapic_entry) | |
290 | return -ENODEV; | |
291 | ||
292 | return remap_ops->setup_ioapic_entry(irq, entry, destination, | |
293 | vector, attr); | |
294 | } | |
295 | ||
296 | static int set_remapped_irq_affinity(struct irq_data *data, | |
297 | const struct cpumask *mask, bool force) | |
298 | { | |
299 | if (!config_enabled(CONFIG_SMP) || !remap_ops || | |
300 | !remap_ops->set_affinity) | |
301 | return 0; | |
302 | ||
303 | return remap_ops->set_affinity(data, mask, force); | |
304 | } | |
305 | ||
306 | void free_remapped_irq(int irq) | |
307 | { | |
308 | struct irq_cfg *cfg = irq_get_chip_data(irq); | |
309 | ||
310 | if (!remap_ops || !remap_ops->free_irq) | |
311 | return; | |
312 | ||
313 | if (irq_remapped(cfg)) | |
314 | remap_ops->free_irq(irq); | |
315 | } | |
316 | ||
317 | void compose_remapped_msi_msg(struct pci_dev *pdev, | |
318 | unsigned int irq, unsigned int dest, | |
319 | struct msi_msg *msg, u8 hpet_id) | |
320 | { | |
321 | struct irq_cfg *cfg = irq_get_chip_data(irq); | |
322 | ||
323 | if (!irq_remapped(cfg)) | |
324 | native_compose_msi_msg(pdev, irq, dest, msg, hpet_id); | |
325 | else if (remap_ops && remap_ops->compose_msi_msg) | |
326 | remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id); | |
327 | } | |
328 | ||
329 | static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec) | |
330 | { | |
331 | if (!remap_ops || !remap_ops->msi_alloc_irq) | |
332 | return -ENODEV; | |
333 | ||
334 | return remap_ops->msi_alloc_irq(pdev, irq, nvec); | |
335 | } | |
336 | ||
337 | static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq, | |
338 | int index, int sub_handle) | |
339 | { | |
340 | if (!remap_ops || !remap_ops->msi_setup_irq) | |
341 | return -ENODEV; | |
342 | ||
343 | return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle); | |
344 | } | |
345 | ||
346 | int setup_hpet_msi_remapped(unsigned int irq, unsigned int id) | |
347 | { | |
348 | if (!remap_ops || !remap_ops->setup_hpet_msi) | |
349 | return -ENODEV; | |
350 | ||
351 | return remap_ops->setup_hpet_msi(irq, id); | |
352 | } | |
353 | ||
354 | void panic_if_irq_remap(const char *msg) | |
355 | { | |
356 | if (irq_remapping_enabled) | |
357 | panic(msg); | |
358 | } | |
359 | ||
360 | static void ir_ack_apic_edge(struct irq_data *data) | |
361 | { | |
362 | ack_APIC_irq(); | |
363 | } | |
364 | ||
365 | static void ir_ack_apic_level(struct irq_data *data) | |
366 | { | |
367 | ack_APIC_irq(); | |
368 | eoi_ioapic_irq(data->irq, data->chip_data); | |
369 | } | |
370 | ||
371 | static void ir_print_prefix(struct irq_data *data, struct seq_file *p) | |
372 | { | |
373 | seq_printf(p, " IR-%s", data->chip->name); | |
374 | } | |
375 | ||
376 | void irq_remap_modify_chip_defaults(struct irq_chip *chip) | |
377 | { | |
378 | chip->irq_print_chip = ir_print_prefix; | |
379 | chip->irq_ack = ir_ack_apic_edge; | |
380 | chip->irq_eoi = ir_ack_apic_level; | |
381 | chip->irq_set_affinity = x86_io_apic_ops.set_affinity; | |
382 | } | |
383 | ||
384 | bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip) | |
385 | { | |
386 | if (!irq_remapped(cfg)) | |
387 | return false; | |
388 | irq_set_status_flags(irq, IRQ_MOVE_PCNTXT); | |
389 | irq_remap_modify_chip_defaults(chip); | |
390 | return true; | |
391 | } |