Commit | Line | Data |
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ad3ad3f6 | 1 | #include <linux/dmar.h> |
2ae21010 SS |
2 | #include <linux/spinlock.h> |
3 | #include <linux/jiffies.h> | |
4 | #include <linux/pci.h> | |
b6fcb33a | 5 | #include <linux/irq.h> |
ad3ad3f6 SS |
6 | #include <asm/io_apic.h> |
7 | #include "intel-iommu.h" | |
8 | #include "intr_remapping.h" | |
9 | ||
10 | static struct ioapic_scope ir_ioapic[MAX_IO_APICS]; | |
11 | static int ir_ioapic_num; | |
2ae21010 SS |
12 | int intr_remapping_enabled; |
13 | ||
b6fcb33a SS |
14 | static struct { |
15 | struct intel_iommu *iommu; | |
16 | u16 irte_index; | |
17 | u16 sub_handle; | |
18 | u8 irte_mask; | |
19 | } irq_2_iommu[NR_IRQS]; | |
20 | ||
21 | static DEFINE_SPINLOCK(irq_2_ir_lock); | |
22 | ||
23 | int irq_remapped(int irq) | |
24 | { | |
25 | if (irq > NR_IRQS) | |
26 | return 0; | |
27 | ||
28 | if (!irq_2_iommu[irq].iommu) | |
29 | return 0; | |
30 | ||
31 | return 1; | |
32 | } | |
33 | ||
34 | int get_irte(int irq, struct irte *entry) | |
35 | { | |
36 | int index; | |
37 | ||
38 | if (!entry || irq > NR_IRQS) | |
39 | return -1; | |
40 | ||
41 | spin_lock(&irq_2_ir_lock); | |
42 | if (!irq_2_iommu[irq].iommu) { | |
43 | spin_unlock(&irq_2_ir_lock); | |
44 | return -1; | |
45 | } | |
46 | ||
47 | index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle; | |
48 | *entry = *(irq_2_iommu[irq].iommu->ir_table->base + index); | |
49 | ||
50 | spin_unlock(&irq_2_ir_lock); | |
51 | return 0; | |
52 | } | |
53 | ||
54 | int alloc_irte(struct intel_iommu *iommu, int irq, u16 count) | |
55 | { | |
56 | struct ir_table *table = iommu->ir_table; | |
57 | u16 index, start_index; | |
58 | unsigned int mask = 0; | |
59 | int i; | |
60 | ||
61 | if (!count) | |
62 | return -1; | |
63 | ||
64 | /* | |
65 | * start the IRTE search from index 0. | |
66 | */ | |
67 | index = start_index = 0; | |
68 | ||
69 | if (count > 1) { | |
70 | count = __roundup_pow_of_two(count); | |
71 | mask = ilog2(count); | |
72 | } | |
73 | ||
74 | if (mask > ecap_max_handle_mask(iommu->ecap)) { | |
75 | printk(KERN_ERR | |
76 | "Requested mask %x exceeds the max invalidation handle" | |
77 | " mask value %Lx\n", mask, | |
78 | ecap_max_handle_mask(iommu->ecap)); | |
79 | return -1; | |
80 | } | |
81 | ||
82 | spin_lock(&irq_2_ir_lock); | |
83 | do { | |
84 | for (i = index; i < index + count; i++) | |
85 | if (table->base[i].present) | |
86 | break; | |
87 | /* empty index found */ | |
88 | if (i == index + count) | |
89 | break; | |
90 | ||
91 | index = (index + count) % INTR_REMAP_TABLE_ENTRIES; | |
92 | ||
93 | if (index == start_index) { | |
94 | spin_unlock(&irq_2_ir_lock); | |
95 | printk(KERN_ERR "can't allocate an IRTE\n"); | |
96 | return -1; | |
97 | } | |
98 | } while (1); | |
99 | ||
100 | for (i = index; i < index + count; i++) | |
101 | table->base[i].present = 1; | |
102 | ||
103 | irq_2_iommu[irq].iommu = iommu; | |
104 | irq_2_iommu[irq].irte_index = index; | |
105 | irq_2_iommu[irq].sub_handle = 0; | |
106 | irq_2_iommu[irq].irte_mask = mask; | |
107 | ||
108 | spin_unlock(&irq_2_ir_lock); | |
109 | ||
110 | return index; | |
111 | } | |
112 | ||
113 | static void qi_flush_iec(struct intel_iommu *iommu, int index, int mask) | |
114 | { | |
115 | struct qi_desc desc; | |
116 | ||
117 | desc.low = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask) | |
118 | | QI_IEC_SELECTIVE; | |
119 | desc.high = 0; | |
120 | ||
121 | qi_submit_sync(&desc, iommu); | |
122 | } | |
123 | ||
124 | int map_irq_to_irte_handle(int irq, u16 *sub_handle) | |
125 | { | |
126 | int index; | |
127 | ||
128 | spin_lock(&irq_2_ir_lock); | |
129 | if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) { | |
130 | spin_unlock(&irq_2_ir_lock); | |
131 | return -1; | |
132 | } | |
133 | ||
134 | *sub_handle = irq_2_iommu[irq].sub_handle; | |
135 | index = irq_2_iommu[irq].irte_index; | |
136 | spin_unlock(&irq_2_ir_lock); | |
137 | return index; | |
138 | } | |
139 | ||
140 | int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle) | |
141 | { | |
142 | spin_lock(&irq_2_ir_lock); | |
143 | if (irq >= NR_IRQS || irq_2_iommu[irq].iommu) { | |
144 | spin_unlock(&irq_2_ir_lock); | |
145 | return -1; | |
146 | } | |
147 | ||
148 | irq_2_iommu[irq].iommu = iommu; | |
149 | irq_2_iommu[irq].irte_index = index; | |
150 | irq_2_iommu[irq].sub_handle = subhandle; | |
151 | irq_2_iommu[irq].irte_mask = 0; | |
152 | ||
153 | spin_unlock(&irq_2_ir_lock); | |
154 | ||
155 | return 0; | |
156 | } | |
157 | ||
158 | int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index) | |
159 | { | |
160 | spin_lock(&irq_2_ir_lock); | |
161 | if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) { | |
162 | spin_unlock(&irq_2_ir_lock); | |
163 | return -1; | |
164 | } | |
165 | ||
166 | irq_2_iommu[irq].iommu = NULL; | |
167 | irq_2_iommu[irq].irte_index = 0; | |
168 | irq_2_iommu[irq].sub_handle = 0; | |
169 | irq_2_iommu[irq].irte_mask = 0; | |
170 | ||
171 | spin_unlock(&irq_2_ir_lock); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | int modify_irte(int irq, struct irte *irte_modified) | |
177 | { | |
178 | int index; | |
179 | struct irte *irte; | |
180 | struct intel_iommu *iommu; | |
181 | ||
182 | spin_lock(&irq_2_ir_lock); | |
183 | if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) { | |
184 | spin_unlock(&irq_2_ir_lock); | |
185 | return -1; | |
186 | } | |
187 | ||
188 | iommu = irq_2_iommu[irq].iommu; | |
189 | ||
190 | index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle; | |
191 | irte = &iommu->ir_table->base[index]; | |
192 | ||
193 | set_64bit((unsigned long *)irte, irte_modified->low | (1 << 1)); | |
194 | __iommu_flush_cache(iommu, irte, sizeof(*irte)); | |
195 | ||
196 | qi_flush_iec(iommu, index, 0); | |
197 | ||
198 | spin_unlock(&irq_2_ir_lock); | |
199 | return 0; | |
200 | } | |
201 | ||
202 | int flush_irte(int irq) | |
203 | { | |
204 | int index; | |
205 | struct intel_iommu *iommu; | |
206 | ||
207 | spin_lock(&irq_2_ir_lock); | |
208 | if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) { | |
209 | spin_unlock(&irq_2_ir_lock); | |
210 | return -1; | |
211 | } | |
212 | ||
213 | iommu = irq_2_iommu[irq].iommu; | |
214 | ||
215 | index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle; | |
216 | ||
217 | qi_flush_iec(iommu, index, irq_2_iommu[irq].irte_mask); | |
218 | spin_unlock(&irq_2_ir_lock); | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
223 | int free_irte(int irq) | |
224 | { | |
225 | int index, i; | |
226 | struct irte *irte; | |
227 | struct intel_iommu *iommu; | |
228 | ||
229 | spin_lock(&irq_2_ir_lock); | |
230 | if (irq >= NR_IRQS || !irq_2_iommu[irq].iommu) { | |
231 | spin_unlock(&irq_2_ir_lock); | |
232 | return -1; | |
233 | } | |
234 | ||
235 | iommu = irq_2_iommu[irq].iommu; | |
236 | ||
237 | index = irq_2_iommu[irq].irte_index + irq_2_iommu[irq].sub_handle; | |
238 | irte = &iommu->ir_table->base[index]; | |
239 | ||
240 | if (!irq_2_iommu[irq].sub_handle) { | |
241 | for (i = 0; i < (1 << irq_2_iommu[irq].irte_mask); i++) | |
242 | set_64bit((unsigned long *)irte, 0); | |
243 | qi_flush_iec(iommu, index, irq_2_iommu[irq].irte_mask); | |
244 | } | |
245 | ||
246 | irq_2_iommu[irq].iommu = NULL; | |
247 | irq_2_iommu[irq].irte_index = 0; | |
248 | irq_2_iommu[irq].sub_handle = 0; | |
249 | irq_2_iommu[irq].irte_mask = 0; | |
250 | ||
251 | spin_unlock(&irq_2_ir_lock); | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
2ae21010 SS |
256 | static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode) |
257 | { | |
258 | u64 addr; | |
259 | u32 cmd, sts; | |
260 | unsigned long flags; | |
261 | ||
262 | addr = virt_to_phys((void *)iommu->ir_table->base); | |
263 | ||
264 | spin_lock_irqsave(&iommu->register_lock, flags); | |
265 | ||
266 | dmar_writeq(iommu->reg + DMAR_IRTA_REG, | |
267 | (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE); | |
268 | ||
269 | /* Set interrupt-remapping table pointer */ | |
270 | cmd = iommu->gcmd | DMA_GCMD_SIRTP; | |
271 | writel(cmd, iommu->reg + DMAR_GCMD_REG); | |
272 | ||
273 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
274 | readl, (sts & DMA_GSTS_IRTPS), sts); | |
275 | spin_unlock_irqrestore(&iommu->register_lock, flags); | |
276 | ||
277 | /* | |
278 | * global invalidation of interrupt entry cache before enabling | |
279 | * interrupt-remapping. | |
280 | */ | |
281 | qi_global_iec(iommu); | |
282 | ||
283 | spin_lock_irqsave(&iommu->register_lock, flags); | |
284 | ||
285 | /* Enable interrupt-remapping */ | |
286 | cmd = iommu->gcmd | DMA_GCMD_IRE; | |
287 | iommu->gcmd |= DMA_GCMD_IRE; | |
288 | writel(cmd, iommu->reg + DMAR_GCMD_REG); | |
289 | ||
290 | IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG, | |
291 | readl, (sts & DMA_GSTS_IRES), sts); | |
292 | ||
293 | spin_unlock_irqrestore(&iommu->register_lock, flags); | |
294 | } | |
295 | ||
296 | ||
297 | static int setup_intr_remapping(struct intel_iommu *iommu, int mode) | |
298 | { | |
299 | struct ir_table *ir_table; | |
300 | struct page *pages; | |
301 | ||
302 | ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table), | |
303 | GFP_KERNEL); | |
304 | ||
305 | if (!iommu->ir_table) | |
306 | return -ENOMEM; | |
307 | ||
308 | pages = alloc_pages(GFP_KERNEL | __GFP_ZERO, INTR_REMAP_PAGE_ORDER); | |
309 | ||
310 | if (!pages) { | |
311 | printk(KERN_ERR "failed to allocate pages of order %d\n", | |
312 | INTR_REMAP_PAGE_ORDER); | |
313 | kfree(iommu->ir_table); | |
314 | return -ENOMEM; | |
315 | } | |
316 | ||
317 | ir_table->base = page_address(pages); | |
318 | ||
319 | iommu_set_intr_remapping(iommu, mode); | |
320 | return 0; | |
321 | } | |
322 | ||
323 | int __init enable_intr_remapping(int eim) | |
324 | { | |
325 | struct dmar_drhd_unit *drhd; | |
326 | int setup = 0; | |
327 | ||
328 | /* | |
329 | * check for the Interrupt-remapping support | |
330 | */ | |
331 | for_each_drhd_unit(drhd) { | |
332 | struct intel_iommu *iommu = drhd->iommu; | |
333 | ||
334 | if (!ecap_ir_support(iommu->ecap)) | |
335 | continue; | |
336 | ||
337 | if (eim && !ecap_eim_support(iommu->ecap)) { | |
338 | printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, " | |
339 | " ecap %Lx\n", drhd->reg_base_addr, iommu->ecap); | |
340 | return -1; | |
341 | } | |
342 | } | |
343 | ||
344 | /* | |
345 | * Enable queued invalidation for all the DRHD's. | |
346 | */ | |
347 | for_each_drhd_unit(drhd) { | |
348 | int ret; | |
349 | struct intel_iommu *iommu = drhd->iommu; | |
350 | ret = dmar_enable_qi(iommu); | |
351 | ||
352 | if (ret) { | |
353 | printk(KERN_ERR "DRHD %Lx: failed to enable queued, " | |
354 | " invalidation, ecap %Lx, ret %d\n", | |
355 | drhd->reg_base_addr, iommu->ecap, ret); | |
356 | return -1; | |
357 | } | |
358 | } | |
359 | ||
360 | /* | |
361 | * Setup Interrupt-remapping for all the DRHD's now. | |
362 | */ | |
363 | for_each_drhd_unit(drhd) { | |
364 | struct intel_iommu *iommu = drhd->iommu; | |
365 | ||
366 | if (!ecap_ir_support(iommu->ecap)) | |
367 | continue; | |
368 | ||
369 | if (setup_intr_remapping(iommu, eim)) | |
370 | goto error; | |
371 | ||
372 | setup = 1; | |
373 | } | |
374 | ||
375 | if (!setup) | |
376 | goto error; | |
377 | ||
378 | intr_remapping_enabled = 1; | |
379 | ||
380 | return 0; | |
381 | ||
382 | error: | |
383 | /* | |
384 | * handle error condition gracefully here! | |
385 | */ | |
386 | return -1; | |
387 | } | |
ad3ad3f6 SS |
388 | |
389 | static int ir_parse_ioapic_scope(struct acpi_dmar_header *header, | |
390 | struct intel_iommu *iommu) | |
391 | { | |
392 | struct acpi_dmar_hardware_unit *drhd; | |
393 | struct acpi_dmar_device_scope *scope; | |
394 | void *start, *end; | |
395 | ||
396 | drhd = (struct acpi_dmar_hardware_unit *)header; | |
397 | ||
398 | start = (void *)(drhd + 1); | |
399 | end = ((void *)drhd) + header->length; | |
400 | ||
401 | while (start < end) { | |
402 | scope = start; | |
403 | if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) { | |
404 | if (ir_ioapic_num == MAX_IO_APICS) { | |
405 | printk(KERN_WARNING "Exceeded Max IO APICS\n"); | |
406 | return -1; | |
407 | } | |
408 | ||
409 | printk(KERN_INFO "IOAPIC id %d under DRHD base" | |
410 | " 0x%Lx\n", scope->enumeration_id, | |
411 | drhd->address); | |
412 | ||
413 | ir_ioapic[ir_ioapic_num].iommu = iommu; | |
414 | ir_ioapic[ir_ioapic_num].id = scope->enumeration_id; | |
415 | ir_ioapic_num++; | |
416 | } | |
417 | start += scope->length; | |
418 | } | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | /* | |
424 | * Finds the assocaition between IOAPIC's and its Interrupt-remapping | |
425 | * hardware unit. | |
426 | */ | |
427 | int __init parse_ioapics_under_ir(void) | |
428 | { | |
429 | struct dmar_drhd_unit *drhd; | |
430 | int ir_supported = 0; | |
431 | ||
432 | for_each_drhd_unit(drhd) { | |
433 | struct intel_iommu *iommu = drhd->iommu; | |
434 | ||
435 | if (ecap_ir_support(iommu->ecap)) { | |
436 | if (ir_parse_ioapic_scope(drhd->hdr, iommu)) | |
437 | return -1; | |
438 | ||
439 | ir_supported = 1; | |
440 | } | |
441 | } | |
442 | ||
443 | if (ir_supported && ir_ioapic_num != nr_ioapics) { | |
444 | printk(KERN_WARNING | |
445 | "Not all IO-APIC's listed under remapping hardware\n"); | |
446 | return -1; | |
447 | } | |
448 | ||
449 | return ir_supported; | |
450 | } |