Commit | Line | Data |
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5aeecaf4 | 1 | #include <linux/interrupt.h> |
ad3ad3f6 | 2 | #include <linux/dmar.h> |
2ae21010 | 3 | #include <linux/spinlock.h> |
5a0e3ad6 | 4 | #include <linux/slab.h> |
2ae21010 | 5 | #include <linux/jiffies.h> |
20f3097b | 6 | #include <linux/hpet.h> |
2ae21010 | 7 | #include <linux/pci.h> |
b6fcb33a | 8 | #include <linux/irq.h> |
8b48463f LZ |
9 | #include <linux/intel-iommu.h> |
10 | #include <linux/acpi.h> | |
ad3ad3f6 | 11 | #include <asm/io_apic.h> |
17483a1f | 12 | #include <asm/smp.h> |
6d652ea1 | 13 | #include <asm/cpu.h> |
8a8f422d | 14 | #include <asm/irq_remapping.h> |
f007e99c | 15 | #include <asm/pci-direct.h> |
5e2b930b | 16 | #include <asm/msidef.h> |
ad3ad3f6 | 17 | |
8a8f422d | 18 | #include "irq_remapping.h" |
736baef4 | 19 | |
eef93fdb JR |
20 | struct ioapic_scope { |
21 | struct intel_iommu *iommu; | |
22 | unsigned int id; | |
23 | unsigned int bus; /* PCI bus number */ | |
24 | unsigned int devfn; /* PCI devfn number */ | |
25 | }; | |
26 | ||
27 | struct hpet_scope { | |
28 | struct intel_iommu *iommu; | |
29 | u8 id; | |
30 | unsigned int bus; | |
31 | unsigned int devfn; | |
32 | }; | |
33 | ||
34 | #define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0) | |
13d09b66 | 35 | #define IRTE_DEST(dest) ((eim_mode) ? dest : dest << 8) |
eef93fdb | 36 | |
13d09b66 | 37 | static int __read_mostly eim_mode; |
ad3ad3f6 | 38 | static struct ioapic_scope ir_ioapic[MAX_IO_APICS]; |
20f3097b | 39 | static struct hpet_scope ir_hpet[MAX_HPET_TBS]; |
d1423d56 | 40 | |
3a5670e8 JL |
41 | /* |
42 | * Lock ordering: | |
43 | * ->dmar_global_lock | |
44 | * ->irq_2_ir_lock | |
45 | * ->qi->q_lock | |
46 | * ->iommu->register_lock | |
47 | * Note: | |
48 | * intel_irq_remap_ops.{supported,prepare,enable,disable,reenable} are called | |
49 | * in single-threaded environment with interrupt disabled, so no need to tabke | |
50 | * the dmar_global_lock. | |
51 | */ | |
96f8e98b | 52 | static DEFINE_RAW_SPINLOCK(irq_2_ir_lock); |
d585d060 | 53 | |
694835dc JL |
54 | static int __init parse_ioapics_under_ir(void); |
55 | ||
e420dfb4 YL |
56 | static struct irq_2_iommu *irq_2_iommu(unsigned int irq) |
57 | { | |
91411da1 | 58 | struct irq_cfg *cfg = irq_cfg(irq); |
349d6767 | 59 | return cfg ? &cfg->irq_2_iommu : NULL; |
0b8f1efa YL |
60 | } |
61 | ||
6a7885c4 | 62 | static int get_irte(int irq, struct irte *entry) |
b6fcb33a | 63 | { |
d585d060 | 64 | struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); |
4c5502b1 | 65 | unsigned long flags; |
d585d060 | 66 | int index; |
b6fcb33a | 67 | |
d585d060 | 68 | if (!entry || !irq_iommu) |
b6fcb33a SS |
69 | return -1; |
70 | ||
96f8e98b | 71 | raw_spin_lock_irqsave(&irq_2_ir_lock, flags); |
b6fcb33a | 72 | |
af437469 GE |
73 | if (unlikely(!irq_iommu->iommu)) { |
74 | raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); | |
75 | return -1; | |
76 | } | |
77 | ||
e420dfb4 YL |
78 | index = irq_iommu->irte_index + irq_iommu->sub_handle; |
79 | *entry = *(irq_iommu->iommu->ir_table->base + index); | |
b6fcb33a | 80 | |
96f8e98b | 81 | raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); |
b6fcb33a SS |
82 | return 0; |
83 | } | |
84 | ||
263b5e86 | 85 | static int alloc_irte(struct intel_iommu *iommu, int irq, u16 count) |
b6fcb33a SS |
86 | { |
87 | struct ir_table *table = iommu->ir_table; | |
d585d060 | 88 | struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); |
91411da1 | 89 | struct irq_cfg *cfg = irq_cfg(irq); |
b6fcb33a | 90 | unsigned int mask = 0; |
4c5502b1 | 91 | unsigned long flags; |
9f4c7448 | 92 | int index; |
b6fcb33a | 93 | |
d585d060 | 94 | if (!count || !irq_iommu) |
e420dfb4 | 95 | return -1; |
e420dfb4 | 96 | |
b6fcb33a SS |
97 | if (count > 1) { |
98 | count = __roundup_pow_of_two(count); | |
99 | mask = ilog2(count); | |
100 | } | |
101 | ||
102 | if (mask > ecap_max_handle_mask(iommu->ecap)) { | |
103 | printk(KERN_ERR | |
104 | "Requested mask %x exceeds the max invalidation handle" | |
105 | " mask value %Lx\n", mask, | |
106 | ecap_max_handle_mask(iommu->ecap)); | |
107 | return -1; | |
108 | } | |
109 | ||
96f8e98b | 110 | raw_spin_lock_irqsave(&irq_2_ir_lock, flags); |
360eb3c5 JL |
111 | index = bitmap_find_free_region(table->bitmap, |
112 | INTR_REMAP_TABLE_ENTRIES, mask); | |
113 | if (index < 0) { | |
114 | pr_warn("IR%d: can't allocate an IRTE\n", iommu->seq_id); | |
115 | } else { | |
116 | cfg->remapped = 1; | |
117 | irq_iommu->iommu = iommu; | |
118 | irq_iommu->irte_index = index; | |
119 | irq_iommu->sub_handle = 0; | |
120 | irq_iommu->irte_mask = mask; | |
121 | } | |
96f8e98b | 122 | raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); |
b6fcb33a SS |
123 | |
124 | return index; | |
125 | } | |
126 | ||
704126ad | 127 | static int qi_flush_iec(struct intel_iommu *iommu, int index, int mask) |
b6fcb33a SS |
128 | { |
129 | struct qi_desc desc; | |
130 | ||
131 | desc.low = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask) | |
132 | | QI_IEC_SELECTIVE; | |
133 | desc.high = 0; | |
134 | ||
704126ad | 135 | return qi_submit_sync(&desc, iommu); |
b6fcb33a SS |
136 | } |
137 | ||
263b5e86 | 138 | static int map_irq_to_irte_handle(int irq, u16 *sub_handle) |
b6fcb33a | 139 | { |
d585d060 | 140 | struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); |
4c5502b1 | 141 | unsigned long flags; |
d585d060 | 142 | int index; |
b6fcb33a | 143 | |
d585d060 | 144 | if (!irq_iommu) |
b6fcb33a | 145 | return -1; |
b6fcb33a | 146 | |
96f8e98b | 147 | raw_spin_lock_irqsave(&irq_2_ir_lock, flags); |
e420dfb4 YL |
148 | *sub_handle = irq_iommu->sub_handle; |
149 | index = irq_iommu->irte_index; | |
96f8e98b | 150 | raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); |
b6fcb33a SS |
151 | return index; |
152 | } | |
153 | ||
263b5e86 | 154 | static int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle) |
b6fcb33a | 155 | { |
d585d060 | 156 | struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); |
91411da1 | 157 | struct irq_cfg *cfg = irq_cfg(irq); |
4c5502b1 | 158 | unsigned long flags; |
e420dfb4 | 159 | |
d585d060 | 160 | if (!irq_iommu) |
0b8f1efa | 161 | return -1; |
d585d060 | 162 | |
96f8e98b | 163 | raw_spin_lock_irqsave(&irq_2_ir_lock, flags); |
0b8f1efa | 164 | |
9b1b0e42 | 165 | cfg->remapped = 1; |
e420dfb4 YL |
166 | irq_iommu->iommu = iommu; |
167 | irq_iommu->irte_index = index; | |
168 | irq_iommu->sub_handle = subhandle; | |
169 | irq_iommu->irte_mask = 0; | |
b6fcb33a | 170 | |
96f8e98b | 171 | raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); |
b6fcb33a SS |
172 | |
173 | return 0; | |
174 | } | |
175 | ||
263b5e86 | 176 | static int modify_irte(int irq, struct irte *irte_modified) |
b6fcb33a | 177 | { |
d585d060 | 178 | struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); |
b6fcb33a | 179 | struct intel_iommu *iommu; |
4c5502b1 | 180 | unsigned long flags; |
d585d060 TG |
181 | struct irte *irte; |
182 | int rc, index; | |
b6fcb33a | 183 | |
d585d060 | 184 | if (!irq_iommu) |
b6fcb33a | 185 | return -1; |
d585d060 | 186 | |
96f8e98b | 187 | raw_spin_lock_irqsave(&irq_2_ir_lock, flags); |
b6fcb33a | 188 | |
e420dfb4 | 189 | iommu = irq_iommu->iommu; |
b6fcb33a | 190 | |
e420dfb4 | 191 | index = irq_iommu->irte_index + irq_iommu->sub_handle; |
b6fcb33a SS |
192 | irte = &iommu->ir_table->base[index]; |
193 | ||
c513b67e LT |
194 | set_64bit(&irte->low, irte_modified->low); |
195 | set_64bit(&irte->high, irte_modified->high); | |
b6fcb33a SS |
196 | __iommu_flush_cache(iommu, irte, sizeof(*irte)); |
197 | ||
704126ad | 198 | rc = qi_flush_iec(iommu, index, 0); |
96f8e98b | 199 | raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); |
704126ad YZ |
200 | |
201 | return rc; | |
b6fcb33a SS |
202 | } |
203 | ||
263b5e86 | 204 | static struct intel_iommu *map_hpet_to_ir(u8 hpet_id) |
20f3097b SS |
205 | { |
206 | int i; | |
207 | ||
208 | for (i = 0; i < MAX_HPET_TBS; i++) | |
a7a3dad9 | 209 | if (ir_hpet[i].id == hpet_id && ir_hpet[i].iommu) |
20f3097b SS |
210 | return ir_hpet[i].iommu; |
211 | return NULL; | |
212 | } | |
213 | ||
263b5e86 | 214 | static struct intel_iommu *map_ioapic_to_ir(int apic) |
89027d35 SS |
215 | { |
216 | int i; | |
217 | ||
218 | for (i = 0; i < MAX_IO_APICS; i++) | |
a7a3dad9 | 219 | if (ir_ioapic[i].id == apic && ir_ioapic[i].iommu) |
89027d35 SS |
220 | return ir_ioapic[i].iommu; |
221 | return NULL; | |
222 | } | |
223 | ||
263b5e86 | 224 | static struct intel_iommu *map_dev_to_ir(struct pci_dev *dev) |
75c46fa6 SS |
225 | { |
226 | struct dmar_drhd_unit *drhd; | |
227 | ||
228 | drhd = dmar_find_matched_drhd_unit(dev); | |
229 | if (!drhd) | |
230 | return NULL; | |
231 | ||
232 | return drhd->iommu; | |
233 | } | |
234 | ||
c4658b4e WH |
235 | static int clear_entries(struct irq_2_iommu *irq_iommu) |
236 | { | |
237 | struct irte *start, *entry, *end; | |
238 | struct intel_iommu *iommu; | |
239 | int index; | |
240 | ||
241 | if (irq_iommu->sub_handle) | |
242 | return 0; | |
243 | ||
244 | iommu = irq_iommu->iommu; | |
245 | index = irq_iommu->irte_index + irq_iommu->sub_handle; | |
246 | ||
247 | start = iommu->ir_table->base + index; | |
248 | end = start + (1 << irq_iommu->irte_mask); | |
249 | ||
250 | for (entry = start; entry < end; entry++) { | |
c513b67e LT |
251 | set_64bit(&entry->low, 0); |
252 | set_64bit(&entry->high, 0); | |
c4658b4e | 253 | } |
360eb3c5 JL |
254 | bitmap_release_region(iommu->ir_table->bitmap, index, |
255 | irq_iommu->irte_mask); | |
c4658b4e WH |
256 | |
257 | return qi_flush_iec(iommu, index, irq_iommu->irte_mask); | |
258 | } | |
259 | ||
9d619f65 | 260 | static int free_irte(int irq) |
b6fcb33a | 261 | { |
d585d060 | 262 | struct irq_2_iommu *irq_iommu = irq_2_iommu(irq); |
4c5502b1 | 263 | unsigned long flags; |
d585d060 | 264 | int rc; |
b6fcb33a | 265 | |
d585d060 | 266 | if (!irq_iommu) |
b6fcb33a | 267 | return -1; |
d585d060 | 268 | |
96f8e98b | 269 | raw_spin_lock_irqsave(&irq_2_ir_lock, flags); |
b6fcb33a | 270 | |
c4658b4e | 271 | rc = clear_entries(irq_iommu); |
b6fcb33a | 272 | |
e420dfb4 YL |
273 | irq_iommu->iommu = NULL; |
274 | irq_iommu->irte_index = 0; | |
275 | irq_iommu->sub_handle = 0; | |
276 | irq_iommu->irte_mask = 0; | |
b6fcb33a | 277 | |
96f8e98b | 278 | raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); |
b6fcb33a | 279 | |
704126ad | 280 | return rc; |
b6fcb33a SS |
281 | } |
282 | ||
f007e99c WH |
283 | /* |
284 | * source validation type | |
285 | */ | |
286 | #define SVT_NO_VERIFY 0x0 /* no verification is required */ | |
25985edc | 287 | #define SVT_VERIFY_SID_SQ 0x1 /* verify using SID and SQ fields */ |
f007e99c WH |
288 | #define SVT_VERIFY_BUS 0x2 /* verify bus of request-id */ |
289 | ||
290 | /* | |
291 | * source-id qualifier | |
292 | */ | |
293 | #define SQ_ALL_16 0x0 /* verify all 16 bits of request-id */ | |
294 | #define SQ_13_IGNORE_1 0x1 /* verify most significant 13 bits, ignore | |
295 | * the third least significant bit | |
296 | */ | |
297 | #define SQ_13_IGNORE_2 0x2 /* verify most significant 13 bits, ignore | |
298 | * the second and third least significant bits | |
299 | */ | |
300 | #define SQ_13_IGNORE_3 0x3 /* verify most significant 13 bits, ignore | |
301 | * the least three significant bits | |
302 | */ | |
303 | ||
304 | /* | |
305 | * set SVT, SQ and SID fields of irte to verify | |
306 | * source ids of interrupt requests | |
307 | */ | |
308 | static void set_irte_sid(struct irte *irte, unsigned int svt, | |
309 | unsigned int sq, unsigned int sid) | |
310 | { | |
d1423d56 CW |
311 | if (disable_sourceid_checking) |
312 | svt = SVT_NO_VERIFY; | |
f007e99c WH |
313 | irte->svt = svt; |
314 | irte->sq = sq; | |
315 | irte->sid = sid; | |
316 | } | |
317 | ||
263b5e86 | 318 | static int set_ioapic_sid(struct irte *irte, int apic) |
f007e99c WH |
319 | { |
320 | int i; | |
321 | u16 sid = 0; | |
322 | ||
323 | if (!irte) | |
324 | return -1; | |
325 | ||
3a5670e8 | 326 | down_read(&dmar_global_lock); |
f007e99c | 327 | for (i = 0; i < MAX_IO_APICS; i++) { |
a7a3dad9 | 328 | if (ir_ioapic[i].iommu && ir_ioapic[i].id == apic) { |
f007e99c WH |
329 | sid = (ir_ioapic[i].bus << 8) | ir_ioapic[i].devfn; |
330 | break; | |
331 | } | |
332 | } | |
3a5670e8 | 333 | up_read(&dmar_global_lock); |
f007e99c WH |
334 | |
335 | if (sid == 0) { | |
336 | pr_warning("Failed to set source-id of IOAPIC (%d)\n", apic); | |
337 | return -1; | |
338 | } | |
339 | ||
2fe2c602 | 340 | set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, sid); |
f007e99c WH |
341 | |
342 | return 0; | |
343 | } | |
344 | ||
263b5e86 | 345 | static int set_hpet_sid(struct irte *irte, u8 id) |
20f3097b SS |
346 | { |
347 | int i; | |
348 | u16 sid = 0; | |
349 | ||
350 | if (!irte) | |
351 | return -1; | |
352 | ||
3a5670e8 | 353 | down_read(&dmar_global_lock); |
20f3097b | 354 | for (i = 0; i < MAX_HPET_TBS; i++) { |
a7a3dad9 | 355 | if (ir_hpet[i].iommu && ir_hpet[i].id == id) { |
20f3097b SS |
356 | sid = (ir_hpet[i].bus << 8) | ir_hpet[i].devfn; |
357 | break; | |
358 | } | |
359 | } | |
3a5670e8 | 360 | up_read(&dmar_global_lock); |
20f3097b SS |
361 | |
362 | if (sid == 0) { | |
363 | pr_warning("Failed to set source-id of HPET block (%d)\n", id); | |
364 | return -1; | |
365 | } | |
366 | ||
367 | /* | |
368 | * Should really use SQ_ALL_16. Some platforms are broken. | |
369 | * While we figure out the right quirks for these broken platforms, use | |
370 | * SQ_13_IGNORE_3 for now. | |
371 | */ | |
372 | set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_13_IGNORE_3, sid); | |
373 | ||
374 | return 0; | |
375 | } | |
376 | ||
579305f7 AW |
377 | struct set_msi_sid_data { |
378 | struct pci_dev *pdev; | |
379 | u16 alias; | |
380 | }; | |
381 | ||
382 | static int set_msi_sid_cb(struct pci_dev *pdev, u16 alias, void *opaque) | |
383 | { | |
384 | struct set_msi_sid_data *data = opaque; | |
385 | ||
386 | data->pdev = pdev; | |
387 | data->alias = alias; | |
388 | ||
389 | return 0; | |
390 | } | |
391 | ||
263b5e86 | 392 | static int set_msi_sid(struct irte *irte, struct pci_dev *dev) |
f007e99c | 393 | { |
579305f7 | 394 | struct set_msi_sid_data data; |
f007e99c WH |
395 | |
396 | if (!irte || !dev) | |
397 | return -1; | |
398 | ||
579305f7 | 399 | pci_for_each_dma_alias(dev, set_msi_sid_cb, &data); |
f007e99c | 400 | |
579305f7 AW |
401 | /* |
402 | * DMA alias provides us with a PCI device and alias. The only case | |
403 | * where the it will return an alias on a different bus than the | |
404 | * device is the case of a PCIe-to-PCI bridge, where the alias is for | |
405 | * the subordinate bus. In this case we can only verify the bus. | |
406 | * | |
407 | * If the alias device is on a different bus than our source device | |
408 | * then we have a topology based alias, use it. | |
409 | * | |
410 | * Otherwise, the alias is for a device DMA quirk and we cannot | |
411 | * assume that MSI uses the same requester ID. Therefore use the | |
412 | * original device. | |
413 | */ | |
414 | if (PCI_BUS_NUM(data.alias) != data.pdev->bus->number) | |
415 | set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16, | |
416 | PCI_DEVID(PCI_BUS_NUM(data.alias), | |
417 | dev->bus->number)); | |
418 | else if (data.pdev->bus->number != dev->bus->number) | |
419 | set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, data.alias); | |
420 | else | |
421 | set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, | |
422 | PCI_DEVID(dev->bus->number, dev->devfn)); | |
f007e99c WH |
423 | |
424 | return 0; | |
425 | } | |
426 | ||
95a02e97 | 427 | static void iommu_set_irq_remapping(struct intel_iommu *iommu, int mode) |
2ae21010 SS |
428 | { |
429 | u64 addr; | |
c416daa9 | 430 | u32 sts; |
2ae21010 SS |
431 | unsigned long flags; |
432 | ||
433 | addr = virt_to_phys((void *)iommu->ir_table->base); | |
434 | ||
1f5b3c3f | 435 | raw_spin_lock_irqsave(&iommu->register_lock, flags); |
2ae21010 SS |
436 | |
437 | dmar_writeq(iommu->reg + DMAR_IRTA_REG, | |
438 | (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE); | |
439 | ||
440 | /* Set interrupt-remapping table pointer */ | |
f63ef690 | 441 | writel(iommu->gcmd | DMA_GCMD_SIRTP, iommu->reg + DMAR_GCMD_REG); |
2ae21010 SS |
442 | |
443 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
444 | readl, (sts & DMA_GSTS_IRTPS), sts); | |
1f5b3c3f | 445 | raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
2ae21010 SS |
446 | |
447 | /* | |
448 | * global invalidation of interrupt entry cache before enabling | |
449 | * interrupt-remapping. | |
450 | */ | |
451 | qi_global_iec(iommu); | |
452 | ||
1f5b3c3f | 453 | raw_spin_lock_irqsave(&iommu->register_lock, flags); |
2ae21010 SS |
454 | |
455 | /* Enable interrupt-remapping */ | |
2ae21010 | 456 | iommu->gcmd |= DMA_GCMD_IRE; |
af8d102f | 457 | iommu->gcmd &= ~DMA_GCMD_CFI; /* Block compatibility-format MSIs */ |
c416daa9 | 458 | writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); |
2ae21010 SS |
459 | |
460 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
461 | readl, (sts & DMA_GSTS_IRES), sts); | |
462 | ||
af8d102f AL |
463 | /* |
464 | * With CFI clear in the Global Command register, we should be | |
465 | * protected from dangerous (i.e. compatibility) interrupts | |
466 | * regardless of x2apic status. Check just to be sure. | |
467 | */ | |
468 | if (sts & DMA_GSTS_CFIS) | |
469 | WARN(1, KERN_WARNING | |
470 | "Compatibility-format IRQs enabled despite intr remapping;\n" | |
471 | "you are vulnerable to IRQ injection.\n"); | |
472 | ||
1f5b3c3f | 473 | raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
2ae21010 SS |
474 | } |
475 | ||
a7a3dad9 | 476 | static int intel_setup_irq_remapping(struct intel_iommu *iommu) |
2ae21010 SS |
477 | { |
478 | struct ir_table *ir_table; | |
479 | struct page *pages; | |
360eb3c5 | 480 | unsigned long *bitmap; |
2ae21010 | 481 | |
a7a3dad9 JL |
482 | if (iommu->ir_table) |
483 | return 0; | |
2ae21010 | 484 | |
e3a981d6 | 485 | ir_table = kzalloc(sizeof(struct ir_table), GFP_KERNEL); |
a7a3dad9 | 486 | if (!ir_table) |
2ae21010 SS |
487 | return -ENOMEM; |
488 | ||
e3a981d6 | 489 | pages = alloc_pages_node(iommu->node, GFP_KERNEL | __GFP_ZERO, |
824cd75b | 490 | INTR_REMAP_PAGE_ORDER); |
2ae21010 SS |
491 | |
492 | if (!pages) { | |
360eb3c5 JL |
493 | pr_err("IR%d: failed to allocate pages of order %d\n", |
494 | iommu->seq_id, INTR_REMAP_PAGE_ORDER); | |
a7a3dad9 | 495 | goto out_free_table; |
2ae21010 SS |
496 | } |
497 | ||
360eb3c5 JL |
498 | bitmap = kcalloc(BITS_TO_LONGS(INTR_REMAP_TABLE_ENTRIES), |
499 | sizeof(long), GFP_ATOMIC); | |
500 | if (bitmap == NULL) { | |
501 | pr_err("IR%d: failed to allocate bitmap\n", iommu->seq_id); | |
a7a3dad9 | 502 | goto out_free_pages; |
360eb3c5 JL |
503 | } |
504 | ||
2ae21010 | 505 | ir_table->base = page_address(pages); |
360eb3c5 | 506 | ir_table->bitmap = bitmap; |
a7a3dad9 | 507 | iommu->ir_table = ir_table; |
2ae21010 | 508 | return 0; |
a7a3dad9 JL |
509 | |
510 | out_free_pages: | |
511 | __free_pages(pages, INTR_REMAP_PAGE_ORDER); | |
512 | out_free_table: | |
513 | kfree(ir_table); | |
514 | return -ENOMEM; | |
515 | } | |
516 | ||
517 | static void intel_teardown_irq_remapping(struct intel_iommu *iommu) | |
518 | { | |
519 | if (iommu && iommu->ir_table) { | |
520 | free_pages((unsigned long)iommu->ir_table->base, | |
521 | INTR_REMAP_PAGE_ORDER); | |
522 | kfree(iommu->ir_table->bitmap); | |
523 | kfree(iommu->ir_table); | |
524 | iommu->ir_table = NULL; | |
525 | } | |
2ae21010 SS |
526 | } |
527 | ||
eba67e5d SS |
528 | /* |
529 | * Disable Interrupt Remapping. | |
530 | */ | |
95a02e97 | 531 | static void iommu_disable_irq_remapping(struct intel_iommu *iommu) |
eba67e5d SS |
532 | { |
533 | unsigned long flags; | |
534 | u32 sts; | |
535 | ||
536 | if (!ecap_ir_support(iommu->ecap)) | |
537 | return; | |
538 | ||
b24696bc FY |
539 | /* |
540 | * global invalidation of interrupt entry cache before disabling | |
541 | * interrupt-remapping. | |
542 | */ | |
543 | qi_global_iec(iommu); | |
544 | ||
1f5b3c3f | 545 | raw_spin_lock_irqsave(&iommu->register_lock, flags); |
eba67e5d SS |
546 | |
547 | sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); | |
548 | if (!(sts & DMA_GSTS_IRES)) | |
549 | goto end; | |
550 | ||
551 | iommu->gcmd &= ~DMA_GCMD_IRE; | |
552 | writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG); | |
553 | ||
554 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
555 | readl, !(sts & DMA_GSTS_IRES), sts); | |
556 | ||
557 | end: | |
1f5b3c3f | 558 | raw_spin_unlock_irqrestore(&iommu->register_lock, flags); |
eba67e5d SS |
559 | } |
560 | ||
41750d31 SS |
561 | static int __init dmar_x2apic_optout(void) |
562 | { | |
563 | struct acpi_table_dmar *dmar; | |
564 | dmar = (struct acpi_table_dmar *)dmar_tbl; | |
565 | if (!dmar || no_x2apic_optout) | |
566 | return 0; | |
567 | return dmar->flags & DMAR_X2APIC_OPT_OUT; | |
568 | } | |
569 | ||
11190302 TG |
570 | static void __init intel_cleanup_irq_remapping(void) |
571 | { | |
572 | struct dmar_drhd_unit *drhd; | |
573 | struct intel_iommu *iommu; | |
574 | ||
575 | for_each_iommu(iommu, drhd) { | |
576 | if (ecap_ir_support(iommu->ecap)) { | |
577 | iommu_disable_irq_remapping(iommu); | |
578 | intel_teardown_irq_remapping(iommu); | |
579 | } | |
580 | } | |
581 | ||
582 | if (x2apic_supported()) | |
583 | pr_warn("Failed to enable irq remapping. You are vulnerable to irq-injection attacks.\n"); | |
584 | } | |
585 | ||
586 | static int __init intel_prepare_irq_remapping(void) | |
2ae21010 SS |
587 | { |
588 | struct dmar_drhd_unit *drhd; | |
7c919779 | 589 | struct intel_iommu *iommu; |
2ae21010 | 590 | |
2966d956 JL |
591 | if (irq_remap_broken) { |
592 | printk(KERN_WARNING | |
593 | "This system BIOS has enabled interrupt remapping\n" | |
594 | "on a chipset that contains an erratum making that\n" | |
595 | "feature unstable. To maintain system stability\n" | |
596 | "interrupt remapping is being disabled. Please\n" | |
597 | "contact your BIOS vendor for an update\n"); | |
598 | add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK); | |
2966d956 JL |
599 | return -ENODEV; |
600 | } | |
601 | ||
11190302 | 602 | if (dmar_table_init() < 0) |
2966d956 JL |
603 | return -ENODEV; |
604 | ||
605 | if (!dmar_ir_support()) | |
606 | return -ENODEV; | |
af8d102f | 607 | |
e936d077 | 608 | if (parse_ioapics_under_ir() != 1) { |
11190302 | 609 | printk(KERN_INFO "Not enabling interrupt remapping\n"); |
af8d102f | 610 | goto error; |
e936d077 YS |
611 | } |
612 | ||
69cf1d8a | 613 | /* First make sure all IOMMUs support IRQ remapping */ |
2966d956 | 614 | for_each_iommu(iommu, drhd) |
69cf1d8a JR |
615 | if (!ecap_ir_support(iommu->ecap)) |
616 | goto error; | |
617 | ||
618 | /* Do the allocations early */ | |
619 | for_each_iommu(iommu, drhd) | |
620 | if (intel_setup_irq_remapping(iommu)) | |
11190302 | 621 | goto error; |
69cf1d8a | 622 | |
11190302 | 623 | return 0; |
2966d956 | 624 | |
11190302 TG |
625 | error: |
626 | intel_cleanup_irq_remapping(); | |
2966d956 | 627 | return -ENODEV; |
11190302 TG |
628 | } |
629 | ||
630 | static int __init intel_enable_irq_remapping(void) | |
631 | { | |
632 | struct dmar_drhd_unit *drhd; | |
633 | struct intel_iommu *iommu; | |
634 | int setup = 0; | |
635 | int eim = 0; | |
636 | ||
637 | if (x2apic_supported()) { | |
41750d31 | 638 | eim = !dmar_x2apic_optout(); |
af8d102f AL |
639 | if (!eim) |
640 | printk(KERN_WARNING | |
641 | "Your BIOS is broken and requested that x2apic be disabled.\n" | |
642 | "This will slightly decrease performance.\n" | |
643 | "Use 'intremap=no_x2apic_optout' to override BIOS request.\n"); | |
41750d31 SS |
644 | } |
645 | ||
7c919779 | 646 | for_each_iommu(iommu, drhd) { |
34aaaa94 HW |
647 | /* |
648 | * If the queued invalidation is already initialized, | |
649 | * shouldn't disable it. | |
650 | */ | |
651 | if (iommu->qi) | |
652 | continue; | |
653 | ||
1531a6a6 SS |
654 | /* |
655 | * Clear previous faults. | |
656 | */ | |
657 | dmar_fault(-1, iommu); | |
658 | ||
659 | /* | |
660 | * Disable intr remapping and queued invalidation, if already | |
661 | * enabled prior to OS handover. | |
662 | */ | |
95a02e97 | 663 | iommu_disable_irq_remapping(iommu); |
1531a6a6 SS |
664 | |
665 | dmar_disable_qi(iommu); | |
666 | } | |
667 | ||
2ae21010 SS |
668 | /* |
669 | * check for the Interrupt-remapping support | |
670 | */ | |
69cf1d8a | 671 | for_each_iommu(iommu, drhd) |
2ae21010 SS |
672 | if (eim && !ecap_eim_support(iommu->ecap)) { |
673 | printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, " | |
674 | " ecap %Lx\n", drhd->reg_base_addr, iommu->ecap); | |
13d09b66 | 675 | eim = 0; |
2ae21010 | 676 | } |
13d09b66 JL |
677 | eim_mode = eim; |
678 | if (eim) | |
679 | pr_info("Queued invalidation will be enabled to support x2apic and Intr-remapping.\n"); | |
2ae21010 SS |
680 | |
681 | /* | |
682 | * Enable queued invalidation for all the DRHD's. | |
683 | */ | |
7c919779 JL |
684 | for_each_iommu(iommu, drhd) { |
685 | int ret = dmar_enable_qi(iommu); | |
2ae21010 SS |
686 | |
687 | if (ret) { | |
688 | printk(KERN_ERR "DRHD %Lx: failed to enable queued, " | |
689 | " invalidation, ecap %Lx, ret %d\n", | |
690 | drhd->reg_base_addr, iommu->ecap, ret); | |
af8d102f | 691 | goto error; |
2ae21010 SS |
692 | } |
693 | } | |
694 | ||
695 | /* | |
696 | * Setup Interrupt-remapping for all the DRHD's now. | |
697 | */ | |
7c919779 | 698 | for_each_iommu(iommu, drhd) { |
a7a3dad9 | 699 | iommu_set_irq_remapping(iommu, eim); |
2ae21010 SS |
700 | setup = 1; |
701 | } | |
702 | ||
703 | if (!setup) | |
704 | goto error; | |
705 | ||
95a02e97 | 706 | irq_remapping_enabled = 1; |
afcc8a40 JR |
707 | |
708 | /* | |
709 | * VT-d has a different layout for IO-APIC entries when | |
710 | * interrupt remapping is enabled. So it needs a special routine | |
711 | * to print IO-APIC entries for debugging purposes too. | |
712 | */ | |
713 | x86_io_apic_ops.print_entries = intel_ir_io_apic_print_entries; | |
714 | ||
41750d31 | 715 | pr_info("Enabled IRQ remapping in %s mode\n", eim ? "x2apic" : "xapic"); |
2ae21010 | 716 | |
41750d31 | 717 | return eim ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE; |
2ae21010 SS |
718 | |
719 | error: | |
11190302 | 720 | intel_cleanup_irq_remapping(); |
2ae21010 SS |
721 | return -1; |
722 | } | |
ad3ad3f6 | 723 | |
a7a3dad9 JL |
724 | static int ir_parse_one_hpet_scope(struct acpi_dmar_device_scope *scope, |
725 | struct intel_iommu *iommu, | |
726 | struct acpi_dmar_hardware_unit *drhd) | |
20f3097b SS |
727 | { |
728 | struct acpi_dmar_pci_path *path; | |
729 | u8 bus; | |
a7a3dad9 | 730 | int count, free = -1; |
20f3097b SS |
731 | |
732 | bus = scope->bus; | |
733 | path = (struct acpi_dmar_pci_path *)(scope + 1); | |
734 | count = (scope->length - sizeof(struct acpi_dmar_device_scope)) | |
735 | / sizeof(struct acpi_dmar_pci_path); | |
736 | ||
737 | while (--count > 0) { | |
738 | /* | |
739 | * Access PCI directly due to the PCI | |
740 | * subsystem isn't initialized yet. | |
741 | */ | |
fa5f508f | 742 | bus = read_pci_config_byte(bus, path->device, path->function, |
20f3097b SS |
743 | PCI_SECONDARY_BUS); |
744 | path++; | |
745 | } | |
a7a3dad9 JL |
746 | |
747 | for (count = 0; count < MAX_HPET_TBS; count++) { | |
748 | if (ir_hpet[count].iommu == iommu && | |
749 | ir_hpet[count].id == scope->enumeration_id) | |
750 | return 0; | |
751 | else if (ir_hpet[count].iommu == NULL && free == -1) | |
752 | free = count; | |
753 | } | |
754 | if (free == -1) { | |
755 | pr_warn("Exceeded Max HPET blocks\n"); | |
756 | return -ENOSPC; | |
757 | } | |
758 | ||
759 | ir_hpet[free].iommu = iommu; | |
760 | ir_hpet[free].id = scope->enumeration_id; | |
761 | ir_hpet[free].bus = bus; | |
762 | ir_hpet[free].devfn = PCI_DEVFN(path->device, path->function); | |
763 | pr_info("HPET id %d under DRHD base 0x%Lx\n", | |
764 | scope->enumeration_id, drhd->address); | |
765 | ||
766 | return 0; | |
20f3097b SS |
767 | } |
768 | ||
a7a3dad9 JL |
769 | static int ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope, |
770 | struct intel_iommu *iommu, | |
771 | struct acpi_dmar_hardware_unit *drhd) | |
f007e99c WH |
772 | { |
773 | struct acpi_dmar_pci_path *path; | |
774 | u8 bus; | |
a7a3dad9 | 775 | int count, free = -1; |
f007e99c WH |
776 | |
777 | bus = scope->bus; | |
778 | path = (struct acpi_dmar_pci_path *)(scope + 1); | |
779 | count = (scope->length - sizeof(struct acpi_dmar_device_scope)) | |
780 | / sizeof(struct acpi_dmar_pci_path); | |
781 | ||
782 | while (--count > 0) { | |
783 | /* | |
784 | * Access PCI directly due to the PCI | |
785 | * subsystem isn't initialized yet. | |
786 | */ | |
fa5f508f | 787 | bus = read_pci_config_byte(bus, path->device, path->function, |
f007e99c WH |
788 | PCI_SECONDARY_BUS); |
789 | path++; | |
790 | } | |
791 | ||
a7a3dad9 JL |
792 | for (count = 0; count < MAX_IO_APICS; count++) { |
793 | if (ir_ioapic[count].iommu == iommu && | |
794 | ir_ioapic[count].id == scope->enumeration_id) | |
795 | return 0; | |
796 | else if (ir_ioapic[count].iommu == NULL && free == -1) | |
797 | free = count; | |
798 | } | |
799 | if (free == -1) { | |
800 | pr_warn("Exceeded Max IO APICS\n"); | |
801 | return -ENOSPC; | |
802 | } | |
803 | ||
804 | ir_ioapic[free].bus = bus; | |
805 | ir_ioapic[free].devfn = PCI_DEVFN(path->device, path->function); | |
806 | ir_ioapic[free].iommu = iommu; | |
807 | ir_ioapic[free].id = scope->enumeration_id; | |
808 | pr_info("IOAPIC id %d under DRHD base 0x%Lx IOMMU %d\n", | |
809 | scope->enumeration_id, drhd->address, iommu->seq_id); | |
810 | ||
811 | return 0; | |
f007e99c WH |
812 | } |
813 | ||
20f3097b SS |
814 | static int ir_parse_ioapic_hpet_scope(struct acpi_dmar_header *header, |
815 | struct intel_iommu *iommu) | |
ad3ad3f6 | 816 | { |
a7a3dad9 | 817 | int ret = 0; |
ad3ad3f6 SS |
818 | struct acpi_dmar_hardware_unit *drhd; |
819 | struct acpi_dmar_device_scope *scope; | |
820 | void *start, *end; | |
821 | ||
822 | drhd = (struct acpi_dmar_hardware_unit *)header; | |
ad3ad3f6 SS |
823 | start = (void *)(drhd + 1); |
824 | end = ((void *)drhd) + header->length; | |
825 | ||
a7a3dad9 | 826 | while (start < end && ret == 0) { |
ad3ad3f6 | 827 | scope = start; |
a7a3dad9 JL |
828 | if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) |
829 | ret = ir_parse_one_ioapic_scope(scope, iommu, drhd); | |
830 | else if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_HPET) | |
831 | ret = ir_parse_one_hpet_scope(scope, iommu, drhd); | |
832 | start += scope->length; | |
833 | } | |
ad3ad3f6 | 834 | |
a7a3dad9 JL |
835 | return ret; |
836 | } | |
20f3097b | 837 | |
a7a3dad9 JL |
838 | static void ir_remove_ioapic_hpet_scope(struct intel_iommu *iommu) |
839 | { | |
840 | int i; | |
20f3097b | 841 | |
a7a3dad9 JL |
842 | for (i = 0; i < MAX_HPET_TBS; i++) |
843 | if (ir_hpet[i].iommu == iommu) | |
844 | ir_hpet[i].iommu = NULL; | |
ad3ad3f6 | 845 | |
a7a3dad9 JL |
846 | for (i = 0; i < MAX_IO_APICS; i++) |
847 | if (ir_ioapic[i].iommu == iommu) | |
848 | ir_ioapic[i].iommu = NULL; | |
ad3ad3f6 SS |
849 | } |
850 | ||
851 | /* | |
852 | * Finds the assocaition between IOAPIC's and its Interrupt-remapping | |
853 | * hardware unit. | |
854 | */ | |
694835dc | 855 | static int __init parse_ioapics_under_ir(void) |
ad3ad3f6 SS |
856 | { |
857 | struct dmar_drhd_unit *drhd; | |
7c919779 | 858 | struct intel_iommu *iommu; |
ad3ad3f6 | 859 | int ir_supported = 0; |
32ab31e0 | 860 | int ioapic_idx; |
ad3ad3f6 | 861 | |
7c919779 | 862 | for_each_iommu(iommu, drhd) |
ad3ad3f6 | 863 | if (ecap_ir_support(iommu->ecap)) { |
20f3097b | 864 | if (ir_parse_ioapic_hpet_scope(drhd->hdr, iommu)) |
ad3ad3f6 SS |
865 | return -1; |
866 | ||
867 | ir_supported = 1; | |
868 | } | |
ad3ad3f6 | 869 | |
32ab31e0 SF |
870 | if (!ir_supported) |
871 | return 0; | |
872 | ||
873 | for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) { | |
874 | int ioapic_id = mpc_ioapic_id(ioapic_idx); | |
875 | if (!map_ioapic_to_ir(ioapic_id)) { | |
876 | pr_err(FW_BUG "ioapic %d has no mapping iommu, " | |
877 | "interrupt remapping will be disabled\n", | |
878 | ioapic_id); | |
879 | return -1; | |
880 | } | |
ad3ad3f6 SS |
881 | } |
882 | ||
32ab31e0 | 883 | return 1; |
ad3ad3f6 | 884 | } |
b24696bc | 885 | |
6a7885c4 | 886 | static int __init ir_dev_scope_init(void) |
c2c7286a | 887 | { |
3a5670e8 JL |
888 | int ret; |
889 | ||
95a02e97 | 890 | if (!irq_remapping_enabled) |
c2c7286a SS |
891 | return 0; |
892 | ||
3a5670e8 JL |
893 | down_write(&dmar_global_lock); |
894 | ret = dmar_dev_scope_init(); | |
895 | up_write(&dmar_global_lock); | |
896 | ||
897 | return ret; | |
c2c7286a SS |
898 | } |
899 | rootfs_initcall(ir_dev_scope_init); | |
900 | ||
95a02e97 | 901 | static void disable_irq_remapping(void) |
b24696bc FY |
902 | { |
903 | struct dmar_drhd_unit *drhd; | |
904 | struct intel_iommu *iommu = NULL; | |
905 | ||
906 | /* | |
907 | * Disable Interrupt-remapping for all the DRHD's now. | |
908 | */ | |
909 | for_each_iommu(iommu, drhd) { | |
910 | if (!ecap_ir_support(iommu->ecap)) | |
911 | continue; | |
912 | ||
95a02e97 | 913 | iommu_disable_irq_remapping(iommu); |
b24696bc FY |
914 | } |
915 | } | |
916 | ||
95a02e97 | 917 | static int reenable_irq_remapping(int eim) |
b24696bc FY |
918 | { |
919 | struct dmar_drhd_unit *drhd; | |
920 | int setup = 0; | |
921 | struct intel_iommu *iommu = NULL; | |
922 | ||
923 | for_each_iommu(iommu, drhd) | |
924 | if (iommu->qi) | |
925 | dmar_reenable_qi(iommu); | |
926 | ||
927 | /* | |
928 | * Setup Interrupt-remapping for all the DRHD's now. | |
929 | */ | |
930 | for_each_iommu(iommu, drhd) { | |
931 | if (!ecap_ir_support(iommu->ecap)) | |
932 | continue; | |
933 | ||
934 | /* Set up interrupt remapping for iommu.*/ | |
95a02e97 | 935 | iommu_set_irq_remapping(iommu, eim); |
b24696bc FY |
936 | setup = 1; |
937 | } | |
938 | ||
939 | if (!setup) | |
940 | goto error; | |
941 | ||
942 | return 0; | |
943 | ||
944 | error: | |
945 | /* | |
946 | * handle error condition gracefully here! | |
947 | */ | |
948 | return -1; | |
949 | } | |
950 | ||
0c3f173a JR |
951 | static void prepare_irte(struct irte *irte, int vector, |
952 | unsigned int dest) | |
953 | { | |
954 | memset(irte, 0, sizeof(*irte)); | |
955 | ||
956 | irte->present = 1; | |
957 | irte->dst_mode = apic->irq_dest_mode; | |
958 | /* | |
959 | * Trigger mode in the IRTE will always be edge, and for IO-APIC, the | |
960 | * actual level or edge trigger will be setup in the IO-APIC | |
961 | * RTE. This will help simplify level triggered irq migration. | |
962 | * For more details, see the comments (in io_apic.c) explainig IO-APIC | |
963 | * irq migration in the presence of interrupt-remapping. | |
964 | */ | |
965 | irte->trigger_mode = 0; | |
966 | irte->dlvry_mode = apic->irq_delivery_mode; | |
967 | irte->vector = vector; | |
968 | irte->dest_id = IRTE_DEST(dest); | |
969 | irte->redir_hint = 1; | |
970 | } | |
971 | ||
972 | static int intel_setup_ioapic_entry(int irq, | |
973 | struct IO_APIC_route_entry *route_entry, | |
974 | unsigned int destination, int vector, | |
975 | struct io_apic_irq_attr *attr) | |
976 | { | |
977 | int ioapic_id = mpc_ioapic_id(attr->ioapic); | |
3a5670e8 | 978 | struct intel_iommu *iommu; |
0c3f173a JR |
979 | struct IR_IO_APIC_route_entry *entry; |
980 | struct irte irte; | |
981 | int index; | |
982 | ||
3a5670e8 JL |
983 | down_read(&dmar_global_lock); |
984 | iommu = map_ioapic_to_ir(ioapic_id); | |
0c3f173a JR |
985 | if (!iommu) { |
986 | pr_warn("No mapping iommu for ioapic %d\n", ioapic_id); | |
3a5670e8 JL |
987 | index = -ENODEV; |
988 | } else { | |
989 | index = alloc_irte(iommu, irq, 1); | |
990 | if (index < 0) { | |
991 | pr_warn("Failed to allocate IRTE for ioapic %d\n", | |
992 | ioapic_id); | |
993 | index = -ENOMEM; | |
994 | } | |
0c3f173a | 995 | } |
3a5670e8 JL |
996 | up_read(&dmar_global_lock); |
997 | if (index < 0) | |
998 | return index; | |
0c3f173a JR |
999 | |
1000 | prepare_irte(&irte, vector, destination); | |
1001 | ||
1002 | /* Set source-id of interrupt request */ | |
1003 | set_ioapic_sid(&irte, ioapic_id); | |
1004 | ||
1005 | modify_irte(irq, &irte); | |
1006 | ||
1007 | apic_printk(APIC_VERBOSE, KERN_DEBUG "IOAPIC[%d]: " | |
1008 | "Set IRTE entry (P:%d FPD:%d Dst_Mode:%d " | |
1009 | "Redir_hint:%d Trig_Mode:%d Dlvry_Mode:%X " | |
1010 | "Avail:%X Vector:%02X Dest:%08X " | |
1011 | "SID:%04X SQ:%X SVT:%X)\n", | |
1012 | attr->ioapic, irte.present, irte.fpd, irte.dst_mode, | |
1013 | irte.redir_hint, irte.trigger_mode, irte.dlvry_mode, | |
1014 | irte.avail, irte.vector, irte.dest_id, | |
1015 | irte.sid, irte.sq, irte.svt); | |
1016 | ||
3a5670e8 | 1017 | entry = (struct IR_IO_APIC_route_entry *)route_entry; |
0c3f173a JR |
1018 | memset(entry, 0, sizeof(*entry)); |
1019 | ||
1020 | entry->index2 = (index >> 15) & 0x1; | |
1021 | entry->zero = 0; | |
1022 | entry->format = 1; | |
1023 | entry->index = (index & 0x7fff); | |
1024 | /* | |
1025 | * IO-APIC RTE will be configured with virtual vector. | |
1026 | * irq handler will do the explicit EOI to the io-apic. | |
1027 | */ | |
1028 | entry->vector = attr->ioapic_pin; | |
1029 | entry->mask = 0; /* enable IRQ */ | |
1030 | entry->trigger = attr->trigger; | |
1031 | entry->polarity = attr->polarity; | |
1032 | ||
1033 | /* Mask level triggered irqs. | |
1034 | * Use IRQ_DELAYED_DISABLE for edge triggered irqs. | |
1035 | */ | |
1036 | if (attr->trigger) | |
1037 | entry->mask = 1; | |
1038 | ||
1039 | return 0; | |
1040 | } | |
1041 | ||
4c1bad6a JR |
1042 | /* |
1043 | * Migrate the IO-APIC irq in the presence of intr-remapping. | |
1044 | * | |
1045 | * For both level and edge triggered, irq migration is a simple atomic | |
1046 | * update(of vector and cpu destination) of IRTE and flush the hardware cache. | |
1047 | * | |
1048 | * For level triggered, we eliminate the io-apic RTE modification (with the | |
1049 | * updated vector information), by using a virtual vector (io-apic pin number). | |
1050 | * Real vector that is used for interrupting cpu will be coming from | |
1051 | * the interrupt-remapping table entry. | |
1052 | * | |
1053 | * As the migration is a simple atomic update of IRTE, the same mechanism | |
1054 | * is used to migrate MSI irq's in the presence of interrupt-remapping. | |
1055 | */ | |
1056 | static int | |
1057 | intel_ioapic_set_affinity(struct irq_data *data, const struct cpumask *mask, | |
1058 | bool force) | |
1059 | { | |
91411da1 | 1060 | struct irq_cfg *cfg = irqd_cfg(data); |
4c1bad6a JR |
1061 | unsigned int dest, irq = data->irq; |
1062 | struct irte irte; | |
ff164324 | 1063 | int err; |
4c1bad6a | 1064 | |
7eb9ae07 SS |
1065 | if (!config_enabled(CONFIG_SMP)) |
1066 | return -EINVAL; | |
1067 | ||
4c1bad6a JR |
1068 | if (!cpumask_intersects(mask, cpu_online_mask)) |
1069 | return -EINVAL; | |
1070 | ||
1071 | if (get_irte(irq, &irte)) | |
1072 | return -EBUSY; | |
1073 | ||
ff164324 AG |
1074 | err = assign_irq_vector(irq, cfg, mask); |
1075 | if (err) | |
1076 | return err; | |
4c1bad6a | 1077 | |
ff164324 AG |
1078 | err = apic->cpu_mask_to_apicid_and(cfg->domain, mask, &dest); |
1079 | if (err) { | |
ed88bed8 | 1080 | if (assign_irq_vector(irq, cfg, data->affinity)) |
ff164324 AG |
1081 | pr_err("Failed to recover vector for irq %d\n", irq); |
1082 | return err; | |
1083 | } | |
4c1bad6a JR |
1084 | |
1085 | irte.vector = cfg->vector; | |
1086 | irte.dest_id = IRTE_DEST(dest); | |
1087 | ||
1088 | /* | |
1089 | * Atomically updates the IRTE with the new destination, vector | |
1090 | * and flushes the interrupt entry cache. | |
1091 | */ | |
1092 | modify_irte(irq, &irte); | |
1093 | ||
1094 | /* | |
1095 | * After this point, all the interrupts will start arriving | |
1096 | * at the new destination. So, time to cleanup the previous | |
1097 | * vector allocation. | |
1098 | */ | |
1099 | if (cfg->move_in_progress) | |
1100 | send_cleanup_vector(cfg); | |
1101 | ||
1102 | cpumask_copy(data->affinity, mask); | |
1103 | return 0; | |
1104 | } | |
0c3f173a | 1105 | |
5e2b930b JR |
1106 | static void intel_compose_msi_msg(struct pci_dev *pdev, |
1107 | unsigned int irq, unsigned int dest, | |
1108 | struct msi_msg *msg, u8 hpet_id) | |
1109 | { | |
1110 | struct irq_cfg *cfg; | |
1111 | struct irte irte; | |
c558df4a | 1112 | u16 sub_handle = 0; |
5e2b930b JR |
1113 | int ir_index; |
1114 | ||
91411da1 | 1115 | cfg = irq_cfg(irq); |
5e2b930b JR |
1116 | |
1117 | ir_index = map_irq_to_irte_handle(irq, &sub_handle); | |
1118 | BUG_ON(ir_index == -1); | |
1119 | ||
1120 | prepare_irte(&irte, cfg->vector, dest); | |
1121 | ||
1122 | /* Set source-id of interrupt request */ | |
1123 | if (pdev) | |
1124 | set_msi_sid(&irte, pdev); | |
1125 | else | |
1126 | set_hpet_sid(&irte, hpet_id); | |
1127 | ||
1128 | modify_irte(irq, &irte); | |
1129 | ||
1130 | msg->address_hi = MSI_ADDR_BASE_HI; | |
1131 | msg->data = sub_handle; | |
1132 | msg->address_lo = MSI_ADDR_BASE_LO | MSI_ADDR_IR_EXT_INT | | |
1133 | MSI_ADDR_IR_SHV | | |
1134 | MSI_ADDR_IR_INDEX1(ir_index) | | |
1135 | MSI_ADDR_IR_INDEX2(ir_index); | |
1136 | } | |
1137 | ||
1138 | /* | |
1139 | * Map the PCI dev to the corresponding remapping hardware unit | |
1140 | * and allocate 'nvec' consecutive interrupt-remapping table entries | |
1141 | * in it. | |
1142 | */ | |
1143 | static int intel_msi_alloc_irq(struct pci_dev *dev, int irq, int nvec) | |
1144 | { | |
1145 | struct intel_iommu *iommu; | |
1146 | int index; | |
1147 | ||
3a5670e8 | 1148 | down_read(&dmar_global_lock); |
5e2b930b JR |
1149 | iommu = map_dev_to_ir(dev); |
1150 | if (!iommu) { | |
1151 | printk(KERN_ERR | |
1152 | "Unable to map PCI %s to iommu\n", pci_name(dev)); | |
3a5670e8 JL |
1153 | index = -ENOENT; |
1154 | } else { | |
1155 | index = alloc_irte(iommu, irq, nvec); | |
1156 | if (index < 0) { | |
1157 | printk(KERN_ERR | |
1158 | "Unable to allocate %d IRTE for PCI %s\n", | |
1159 | nvec, pci_name(dev)); | |
1160 | index = -ENOSPC; | |
1161 | } | |
5e2b930b | 1162 | } |
3a5670e8 | 1163 | up_read(&dmar_global_lock); |
5e2b930b | 1164 | |
5e2b930b JR |
1165 | return index; |
1166 | } | |
1167 | ||
1168 | static int intel_msi_setup_irq(struct pci_dev *pdev, unsigned int irq, | |
1169 | int index, int sub_handle) | |
1170 | { | |
1171 | struct intel_iommu *iommu; | |
3a5670e8 | 1172 | int ret = -ENOENT; |
5e2b930b | 1173 | |
3a5670e8 | 1174 | down_read(&dmar_global_lock); |
5e2b930b | 1175 | iommu = map_dev_to_ir(pdev); |
3a5670e8 JL |
1176 | if (iommu) { |
1177 | /* | |
1178 | * setup the mapping between the irq and the IRTE | |
1179 | * base index, the sub_handle pointing to the | |
1180 | * appropriate interrupt remap table entry. | |
1181 | */ | |
1182 | set_irte_irq(irq, iommu, index, sub_handle); | |
1183 | ret = 0; | |
1184 | } | |
1185 | up_read(&dmar_global_lock); | |
5e2b930b | 1186 | |
3a5670e8 | 1187 | return ret; |
5e2b930b JR |
1188 | } |
1189 | ||
5fc24d8c | 1190 | static int intel_alloc_hpet_msi(unsigned int irq, unsigned int id) |
5e2b930b | 1191 | { |
3a5670e8 JL |
1192 | int ret = -1; |
1193 | struct intel_iommu *iommu; | |
5e2b930b JR |
1194 | int index; |
1195 | ||
3a5670e8 JL |
1196 | down_read(&dmar_global_lock); |
1197 | iommu = map_hpet_to_ir(id); | |
1198 | if (iommu) { | |
1199 | index = alloc_irte(iommu, irq, 1); | |
1200 | if (index >= 0) | |
1201 | ret = 0; | |
1202 | } | |
1203 | up_read(&dmar_global_lock); | |
5e2b930b | 1204 | |
3a5670e8 | 1205 | return ret; |
5e2b930b JR |
1206 | } |
1207 | ||
736baef4 | 1208 | struct irq_remap_ops intel_irq_remap_ops = { |
11190302 | 1209 | .prepare = intel_prepare_irq_remapping, |
95a02e97 SS |
1210 | .enable = intel_enable_irq_remapping, |
1211 | .disable = disable_irq_remapping, | |
1212 | .reenable = reenable_irq_remapping, | |
4f3d8b67 | 1213 | .enable_faulting = enable_drhd_fault_handling, |
0c3f173a | 1214 | .setup_ioapic_entry = intel_setup_ioapic_entry, |
4c1bad6a | 1215 | .set_affinity = intel_ioapic_set_affinity, |
9d619f65 | 1216 | .free_irq = free_irte, |
5e2b930b JR |
1217 | .compose_msi_msg = intel_compose_msi_msg, |
1218 | .msi_alloc_irq = intel_msi_alloc_irq, | |
1219 | .msi_setup_irq = intel_msi_setup_irq, | |
5fc24d8c | 1220 | .alloc_hpet_msi = intel_alloc_hpet_msi, |
736baef4 | 1221 | }; |
6b197249 | 1222 | |
a7a3dad9 JL |
1223 | /* |
1224 | * Support of Interrupt Remapping Unit Hotplug | |
1225 | */ | |
1226 | static int dmar_ir_add(struct dmar_drhd_unit *dmaru, struct intel_iommu *iommu) | |
1227 | { | |
1228 | int ret; | |
1229 | int eim = x2apic_enabled(); | |
1230 | ||
1231 | if (eim && !ecap_eim_support(iommu->ecap)) { | |
1232 | pr_info("DRHD %Lx: EIM not supported by DRHD, ecap %Lx\n", | |
1233 | iommu->reg_phys, iommu->ecap); | |
1234 | return -ENODEV; | |
1235 | } | |
1236 | ||
1237 | if (ir_parse_ioapic_hpet_scope(dmaru->hdr, iommu)) { | |
1238 | pr_warn("DRHD %Lx: failed to parse managed IOAPIC/HPET\n", | |
1239 | iommu->reg_phys); | |
1240 | return -ENODEV; | |
1241 | } | |
1242 | ||
1243 | /* TODO: check all IOAPICs are covered by IOMMU */ | |
1244 | ||
1245 | /* Setup Interrupt-remapping now. */ | |
1246 | ret = intel_setup_irq_remapping(iommu); | |
1247 | if (ret) { | |
1248 | pr_err("DRHD %Lx: failed to allocate resource\n", | |
1249 | iommu->reg_phys); | |
1250 | ir_remove_ioapic_hpet_scope(iommu); | |
1251 | return ret; | |
1252 | } | |
1253 | ||
1254 | if (!iommu->qi) { | |
1255 | /* Clear previous faults. */ | |
1256 | dmar_fault(-1, iommu); | |
1257 | iommu_disable_irq_remapping(iommu); | |
1258 | dmar_disable_qi(iommu); | |
1259 | } | |
1260 | ||
1261 | /* Enable queued invalidation */ | |
1262 | ret = dmar_enable_qi(iommu); | |
1263 | if (!ret) { | |
1264 | iommu_set_irq_remapping(iommu, eim); | |
1265 | } else { | |
1266 | pr_err("DRHD %Lx: failed to enable queued invalidation, ecap %Lx, ret %d\n", | |
1267 | iommu->reg_phys, iommu->ecap, ret); | |
1268 | intel_teardown_irq_remapping(iommu); | |
1269 | ir_remove_ioapic_hpet_scope(iommu); | |
1270 | } | |
1271 | ||
1272 | return ret; | |
1273 | } | |
1274 | ||
6b197249 JL |
1275 | int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert) |
1276 | { | |
a7a3dad9 JL |
1277 | int ret = 0; |
1278 | struct intel_iommu *iommu = dmaru->iommu; | |
1279 | ||
1280 | if (!irq_remapping_enabled) | |
1281 | return 0; | |
1282 | if (iommu == NULL) | |
1283 | return -EINVAL; | |
1284 | if (!ecap_ir_support(iommu->ecap)) | |
1285 | return 0; | |
1286 | ||
1287 | if (insert) { | |
1288 | if (!iommu->ir_table) | |
1289 | ret = dmar_ir_add(dmaru, iommu); | |
1290 | } else { | |
1291 | if (iommu->ir_table) { | |
1292 | if (!bitmap_empty(iommu->ir_table->bitmap, | |
1293 | INTR_REMAP_TABLE_ENTRIES)) { | |
1294 | ret = -EBUSY; | |
1295 | } else { | |
1296 | iommu_disable_irq_remapping(iommu); | |
1297 | intel_teardown_irq_remapping(iommu); | |
1298 | ir_remove_ioapic_hpet_scope(iommu); | |
1299 | } | |
1300 | } | |
1301 | } | |
1302 | ||
1303 | return ret; | |
6b197249 | 1304 | } |