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1 /*
2 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <jroedel@suse.de>
4 * Leo Duran <leo.duran@amd.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include <linux/ratelimit.h>
21 #include <linux/pci.h>
22 #include <linux/acpi.h>
23 #include <linux/amba/bus.h>
24 #include <linux/platform_device.h>
25 #include <linux/pci-ats.h>
26 #include <linux/bitmap.h>
27 #include <linux/slab.h>
28 #include <linux/debugfs.h>
29 #include <linux/scatterlist.h>
30 #include <linux/dma-mapping.h>
31 #include <linux/iommu-helper.h>
32 #include <linux/iommu.h>
33 #include <linux/delay.h>
34 #include <linux/amd-iommu.h>
35 #include <linux/notifier.h>
36 #include <linux/export.h>
37 #include <linux/irq.h>
38 #include <linux/msi.h>
39 #include <linux/dma-contiguous.h>
40 #include <linux/irqdomain.h>
41 #include <linux/percpu.h>
42 #include <linux/iova.h>
43 #include <asm/irq_remapping.h>
44 #include <asm/io_apic.h>
45 #include <asm/apic.h>
46 #include <asm/hw_irq.h>
47 #include <asm/msidef.h>
48 #include <asm/proto.h>
49 #include <asm/iommu.h>
50 #include <asm/gart.h>
51 #include <asm/dma.h>
52
53 #include "amd_iommu_proto.h"
54 #include "amd_iommu_types.h"
55 #include "irq_remapping.h"
56
57 #define CMD_SET_TYPE(cmd, t) ((cmd)->data[1] |= ((t) << 28))
58
59 #define LOOP_TIMEOUT 100000
60
61 /* IO virtual address start page frame number */
62 #define IOVA_START_PFN (1)
63 #define IOVA_PFN(addr) ((addr) >> PAGE_SHIFT)
64 #define DMA_32BIT_PFN IOVA_PFN(DMA_BIT_MASK(32))
65
66 /* Reserved IOVA ranges */
67 #define MSI_RANGE_START (0xfee00000)
68 #define MSI_RANGE_END (0xfeefffff)
69 #define HT_RANGE_START (0xfd00000000ULL)
70 #define HT_RANGE_END (0xffffffffffULL)
71
72 /*
73 * This bitmap is used to advertise the page sizes our hardware support
74 * to the IOMMU core, which will then use this information to split
75 * physically contiguous memory regions it is mapping into page sizes
76 * that we support.
77 *
78 * 512GB Pages are not supported due to a hardware bug
79 */
80 #define AMD_IOMMU_PGSIZES ((~0xFFFUL) & ~(2ULL << 38))
81
82 static DEFINE_RWLOCK(amd_iommu_devtable_lock);
83
84 /* List of all available dev_data structures */
85 static LIST_HEAD(dev_data_list);
86 static DEFINE_SPINLOCK(dev_data_list_lock);
87
88 LIST_HEAD(ioapic_map);
89 LIST_HEAD(hpet_map);
90 LIST_HEAD(acpihid_map);
91
92 #define FLUSH_QUEUE_SIZE 256
93
94 struct flush_queue_entry {
95 unsigned long iova_pfn;
96 unsigned long pages;
97 struct dma_ops_domain *dma_dom;
98 };
99
100 struct flush_queue {
101 spinlock_t lock;
102 unsigned next;
103 struct flush_queue_entry *entries;
104 };
105
106 static DEFINE_PER_CPU(struct flush_queue, flush_queue);
107
108 static atomic_t queue_timer_on;
109 static struct timer_list queue_timer;
110
111 /*
112 * Domain for untranslated devices - only allocated
113 * if iommu=pt passed on kernel cmd line.
114 */
115 const struct iommu_ops amd_iommu_ops;
116
117 static ATOMIC_NOTIFIER_HEAD(ppr_notifier);
118 int amd_iommu_max_glx_val = -1;
119
120 static struct dma_map_ops amd_iommu_dma_ops;
121
122 /*
123 * This struct contains device specific data for the IOMMU
124 */
125 struct iommu_dev_data {
126 struct list_head list; /* For domain->dev_list */
127 struct list_head dev_data_list; /* For global dev_data_list */
128 struct protection_domain *domain; /* Domain the device is bound to */
129 u16 devid; /* PCI Device ID */
130 u16 alias; /* Alias Device ID */
131 bool iommu_v2; /* Device can make use of IOMMUv2 */
132 bool passthrough; /* Device is identity mapped */
133 struct {
134 bool enabled;
135 int qdep;
136 } ats; /* ATS state */
137 bool pri_tlp; /* PASID TLB required for
138 PPR completions */
139 u32 errata; /* Bitmap for errata to apply */
140 bool use_vapic; /* Enable device to use vapic mode */
141 };
142
143 /*
144 * general struct to manage commands send to an IOMMU
145 */
146 struct iommu_cmd {
147 u32 data[4];
148 };
149
150 struct kmem_cache *amd_iommu_irq_cache;
151
152 static void update_domain(struct protection_domain *domain);
153 static int protection_domain_init(struct protection_domain *domain);
154 static void detach_device(struct device *dev);
155
156 /*
157 * Data container for a dma_ops specific protection domain
158 */
159 struct dma_ops_domain {
160 /* generic protection domain information */
161 struct protection_domain domain;
162
163 /* IOVA RB-Tree */
164 struct iova_domain iovad;
165 };
166
167 static struct iova_domain reserved_iova_ranges;
168 static struct lock_class_key reserved_rbtree_key;
169
170 /****************************************************************************
171 *
172 * Helper functions
173 *
174 ****************************************************************************/
175
176 static inline int match_hid_uid(struct device *dev,
177 struct acpihid_map_entry *entry)
178 {
179 const char *hid, *uid;
180
181 hid = acpi_device_hid(ACPI_COMPANION(dev));
182 uid = acpi_device_uid(ACPI_COMPANION(dev));
183
184 if (!hid || !(*hid))
185 return -ENODEV;
186
187 if (!uid || !(*uid))
188 return strcmp(hid, entry->hid);
189
190 if (!(*entry->uid))
191 return strcmp(hid, entry->hid);
192
193 return (strcmp(hid, entry->hid) || strcmp(uid, entry->uid));
194 }
195
196 static inline u16 get_pci_device_id(struct device *dev)
197 {
198 struct pci_dev *pdev = to_pci_dev(dev);
199
200 return PCI_DEVID(pdev->bus->number, pdev->devfn);
201 }
202
203 static inline int get_acpihid_device_id(struct device *dev,
204 struct acpihid_map_entry **entry)
205 {
206 struct acpihid_map_entry *p;
207
208 list_for_each_entry(p, &acpihid_map, list) {
209 if (!match_hid_uid(dev, p)) {
210 if (entry)
211 *entry = p;
212 return p->devid;
213 }
214 }
215 return -EINVAL;
216 }
217
218 static inline int get_device_id(struct device *dev)
219 {
220 int devid;
221
222 if (dev_is_pci(dev))
223 devid = get_pci_device_id(dev);
224 else
225 devid = get_acpihid_device_id(dev, NULL);
226
227 return devid;
228 }
229
230 static struct protection_domain *to_pdomain(struct iommu_domain *dom)
231 {
232 return container_of(dom, struct protection_domain, domain);
233 }
234
235 static struct dma_ops_domain* to_dma_ops_domain(struct protection_domain *domain)
236 {
237 BUG_ON(domain->flags != PD_DMA_OPS_MASK);
238 return container_of(domain, struct dma_ops_domain, domain);
239 }
240
241 static struct iommu_dev_data *alloc_dev_data(u16 devid)
242 {
243 struct iommu_dev_data *dev_data;
244 unsigned long flags;
245
246 dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL);
247 if (!dev_data)
248 return NULL;
249
250 dev_data->devid = devid;
251
252 spin_lock_irqsave(&dev_data_list_lock, flags);
253 list_add_tail(&dev_data->dev_data_list, &dev_data_list);
254 spin_unlock_irqrestore(&dev_data_list_lock, flags);
255
256 return dev_data;
257 }
258
259 static struct iommu_dev_data *search_dev_data(u16 devid)
260 {
261 struct iommu_dev_data *dev_data;
262 unsigned long flags;
263
264 spin_lock_irqsave(&dev_data_list_lock, flags);
265 list_for_each_entry(dev_data, &dev_data_list, dev_data_list) {
266 if (dev_data->devid == devid)
267 goto out_unlock;
268 }
269
270 dev_data = NULL;
271
272 out_unlock:
273 spin_unlock_irqrestore(&dev_data_list_lock, flags);
274
275 return dev_data;
276 }
277
278 static int __last_alias(struct pci_dev *pdev, u16 alias, void *data)
279 {
280 *(u16 *)data = alias;
281 return 0;
282 }
283
284 static u16 get_alias(struct device *dev)
285 {
286 struct pci_dev *pdev = to_pci_dev(dev);
287 u16 devid, ivrs_alias, pci_alias;
288
289 /* The callers make sure that get_device_id() does not fail here */
290 devid = get_device_id(dev);
291 ivrs_alias = amd_iommu_alias_table[devid];
292 pci_for_each_dma_alias(pdev, __last_alias, &pci_alias);
293
294 if (ivrs_alias == pci_alias)
295 return ivrs_alias;
296
297 /*
298 * DMA alias showdown
299 *
300 * The IVRS is fairly reliable in telling us about aliases, but it
301 * can't know about every screwy device. If we don't have an IVRS
302 * reported alias, use the PCI reported alias. In that case we may
303 * still need to initialize the rlookup and dev_table entries if the
304 * alias is to a non-existent device.
305 */
306 if (ivrs_alias == devid) {
307 if (!amd_iommu_rlookup_table[pci_alias]) {
308 amd_iommu_rlookup_table[pci_alias] =
309 amd_iommu_rlookup_table[devid];
310 memcpy(amd_iommu_dev_table[pci_alias].data,
311 amd_iommu_dev_table[devid].data,
312 sizeof(amd_iommu_dev_table[pci_alias].data));
313 }
314
315 return pci_alias;
316 }
317
318 pr_info("AMD-Vi: Using IVRS reported alias %02x:%02x.%d "
319 "for device %s[%04x:%04x], kernel reported alias "
320 "%02x:%02x.%d\n", PCI_BUS_NUM(ivrs_alias), PCI_SLOT(ivrs_alias),
321 PCI_FUNC(ivrs_alias), dev_name(dev), pdev->vendor, pdev->device,
322 PCI_BUS_NUM(pci_alias), PCI_SLOT(pci_alias),
323 PCI_FUNC(pci_alias));
324
325 /*
326 * If we don't have a PCI DMA alias and the IVRS alias is on the same
327 * bus, then the IVRS table may know about a quirk that we don't.
328 */
329 if (pci_alias == devid &&
330 PCI_BUS_NUM(ivrs_alias) == pdev->bus->number) {
331 pci_add_dma_alias(pdev, ivrs_alias & 0xff);
332 pr_info("AMD-Vi: Added PCI DMA alias %02x.%d for %s\n",
333 PCI_SLOT(ivrs_alias), PCI_FUNC(ivrs_alias),
334 dev_name(dev));
335 }
336
337 return ivrs_alias;
338 }
339
340 static struct iommu_dev_data *find_dev_data(u16 devid)
341 {
342 struct iommu_dev_data *dev_data;
343
344 dev_data = search_dev_data(devid);
345
346 if (dev_data == NULL)
347 dev_data = alloc_dev_data(devid);
348
349 return dev_data;
350 }
351
352 static struct iommu_dev_data *get_dev_data(struct device *dev)
353 {
354 return dev->archdata.iommu;
355 }
356
357 /*
358 * Find or create an IOMMU group for a acpihid device.
359 */
360 static struct iommu_group *acpihid_device_group(struct device *dev)
361 {
362 struct acpihid_map_entry *p, *entry = NULL;
363 int devid;
364
365 devid = get_acpihid_device_id(dev, &entry);
366 if (devid < 0)
367 return ERR_PTR(devid);
368
369 list_for_each_entry(p, &acpihid_map, list) {
370 if ((devid == p->devid) && p->group)
371 entry->group = p->group;
372 }
373
374 if (!entry->group)
375 entry->group = generic_device_group(dev);
376 else
377 iommu_group_ref_get(entry->group);
378
379 return entry->group;
380 }
381
382 static bool pci_iommuv2_capable(struct pci_dev *pdev)
383 {
384 static const int caps[] = {
385 PCI_EXT_CAP_ID_ATS,
386 PCI_EXT_CAP_ID_PRI,
387 PCI_EXT_CAP_ID_PASID,
388 };
389 int i, pos;
390
391 for (i = 0; i < 3; ++i) {
392 pos = pci_find_ext_capability(pdev, caps[i]);
393 if (pos == 0)
394 return false;
395 }
396
397 return true;
398 }
399
400 static bool pdev_pri_erratum(struct pci_dev *pdev, u32 erratum)
401 {
402 struct iommu_dev_data *dev_data;
403
404 dev_data = get_dev_data(&pdev->dev);
405
406 return dev_data->errata & (1 << erratum) ? true : false;
407 }
408
409 /*
410 * This function checks if the driver got a valid device from the caller to
411 * avoid dereferencing invalid pointers.
412 */
413 static bool check_device(struct device *dev)
414 {
415 int devid;
416
417 if (!dev || !dev->dma_mask)
418 return false;
419
420 devid = get_device_id(dev);
421 if (devid < 0)
422 return false;
423
424 /* Out of our scope? */
425 if (devid > amd_iommu_last_bdf)
426 return false;
427
428 if (amd_iommu_rlookup_table[devid] == NULL)
429 return false;
430
431 return true;
432 }
433
434 static void init_iommu_group(struct device *dev)
435 {
436 struct iommu_group *group;
437
438 group = iommu_group_get_for_dev(dev);
439 if (IS_ERR(group))
440 return;
441
442 iommu_group_put(group);
443 }
444
445 static int iommu_init_device(struct device *dev)
446 {
447 struct iommu_dev_data *dev_data;
448 struct amd_iommu *iommu;
449 int devid;
450
451 if (dev->archdata.iommu)
452 return 0;
453
454 devid = get_device_id(dev);
455 if (devid < 0)
456 return devid;
457
458 iommu = amd_iommu_rlookup_table[devid];
459
460 dev_data = find_dev_data(devid);
461 if (!dev_data)
462 return -ENOMEM;
463
464 dev_data->alias = get_alias(dev);
465
466 if (dev_is_pci(dev) && pci_iommuv2_capable(to_pci_dev(dev))) {
467 struct amd_iommu *iommu;
468
469 iommu = amd_iommu_rlookup_table[dev_data->devid];
470 dev_data->iommu_v2 = iommu->is_iommu_v2;
471 }
472
473 dev->archdata.iommu = dev_data;
474
475 iommu_device_link(&iommu->iommu, dev);
476
477 return 0;
478 }
479
480 static void iommu_ignore_device(struct device *dev)
481 {
482 u16 alias;
483 int devid;
484
485 devid = get_device_id(dev);
486 if (devid < 0)
487 return;
488
489 alias = get_alias(dev);
490
491 memset(&amd_iommu_dev_table[devid], 0, sizeof(struct dev_table_entry));
492 memset(&amd_iommu_dev_table[alias], 0, sizeof(struct dev_table_entry));
493
494 amd_iommu_rlookup_table[devid] = NULL;
495 amd_iommu_rlookup_table[alias] = NULL;
496 }
497
498 static void iommu_uninit_device(struct device *dev)
499 {
500 struct iommu_dev_data *dev_data;
501 struct amd_iommu *iommu;
502 int devid;
503
504 devid = get_device_id(dev);
505 if (devid < 0)
506 return;
507
508 iommu = amd_iommu_rlookup_table[devid];
509
510 dev_data = search_dev_data(devid);
511 if (!dev_data)
512 return;
513
514 if (dev_data->domain)
515 detach_device(dev);
516
517 iommu_device_unlink(&iommu->iommu, dev);
518
519 iommu_group_remove_device(dev);
520
521 /* Remove dma-ops */
522 dev->archdata.dma_ops = NULL;
523
524 /*
525 * We keep dev_data around for unplugged devices and reuse it when the
526 * device is re-plugged - not doing so would introduce a ton of races.
527 */
528 }
529
530 /****************************************************************************
531 *
532 * Interrupt handling functions
533 *
534 ****************************************************************************/
535
536 static void dump_dte_entry(u16 devid)
537 {
538 int i;
539
540 for (i = 0; i < 4; ++i)
541 pr_err("AMD-Vi: DTE[%d]: %016llx\n", i,
542 amd_iommu_dev_table[devid].data[i]);
543 }
544
545 static void dump_command(unsigned long phys_addr)
546 {
547 struct iommu_cmd *cmd = phys_to_virt(phys_addr);
548 int i;
549
550 for (i = 0; i < 4; ++i)
551 pr_err("AMD-Vi: CMD[%d]: %08x\n", i, cmd->data[i]);
552 }
553
554 static void iommu_print_event(struct amd_iommu *iommu, void *__evt)
555 {
556 int type, devid, domid, flags;
557 volatile u32 *event = __evt;
558 int count = 0;
559 u64 address;
560
561 retry:
562 type = (event[1] >> EVENT_TYPE_SHIFT) & EVENT_TYPE_MASK;
563 devid = (event[0] >> EVENT_DEVID_SHIFT) & EVENT_DEVID_MASK;
564 domid = (event[1] >> EVENT_DOMID_SHIFT) & EVENT_DOMID_MASK;
565 flags = (event[1] >> EVENT_FLAGS_SHIFT) & EVENT_FLAGS_MASK;
566 address = (u64)(((u64)event[3]) << 32) | event[2];
567
568 if (type == 0) {
569 /* Did we hit the erratum? */
570 if (++count == LOOP_TIMEOUT) {
571 pr_err("AMD-Vi: No event written to event log\n");
572 return;
573 }
574 udelay(1);
575 goto retry;
576 }
577
578 printk(KERN_ERR "AMD-Vi: Event logged [");
579
580 switch (type) {
581 case EVENT_TYPE_ILL_DEV:
582 printk("ILLEGAL_DEV_TABLE_ENTRY device=%02x:%02x.%x "
583 "address=0x%016llx flags=0x%04x]\n",
584 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
585 address, flags);
586 dump_dte_entry(devid);
587 break;
588 case EVENT_TYPE_IO_FAULT:
589 printk("IO_PAGE_FAULT device=%02x:%02x.%x "
590 "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
591 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
592 domid, address, flags);
593 break;
594 case EVENT_TYPE_DEV_TAB_ERR:
595 printk("DEV_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
596 "address=0x%016llx flags=0x%04x]\n",
597 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
598 address, flags);
599 break;
600 case EVENT_TYPE_PAGE_TAB_ERR:
601 printk("PAGE_TAB_HARDWARE_ERROR device=%02x:%02x.%x "
602 "domain=0x%04x address=0x%016llx flags=0x%04x]\n",
603 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
604 domid, address, flags);
605 break;
606 case EVENT_TYPE_ILL_CMD:
607 printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address);
608 dump_command(address);
609 break;
610 case EVENT_TYPE_CMD_HARD_ERR:
611 printk("COMMAND_HARDWARE_ERROR address=0x%016llx "
612 "flags=0x%04x]\n", address, flags);
613 break;
614 case EVENT_TYPE_IOTLB_INV_TO:
615 printk("IOTLB_INV_TIMEOUT device=%02x:%02x.%x "
616 "address=0x%016llx]\n",
617 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
618 address);
619 break;
620 case EVENT_TYPE_INV_DEV_REQ:
621 printk("INVALID_DEVICE_REQUEST device=%02x:%02x.%x "
622 "address=0x%016llx flags=0x%04x]\n",
623 PCI_BUS_NUM(devid), PCI_SLOT(devid), PCI_FUNC(devid),
624 address, flags);
625 break;
626 default:
627 printk(KERN_ERR "UNKNOWN type=0x%02x]\n", type);
628 }
629
630 memset(__evt, 0, 4 * sizeof(u32));
631 }
632
633 static void iommu_poll_events(struct amd_iommu *iommu)
634 {
635 u32 head, tail;
636
637 head = readl(iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
638 tail = readl(iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
639
640 while (head != tail) {
641 iommu_print_event(iommu, iommu->evt_buf + head);
642 head = (head + EVENT_ENTRY_SIZE) % EVT_BUFFER_SIZE;
643 }
644
645 writel(head, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
646 }
647
648 static void iommu_handle_ppr_entry(struct amd_iommu *iommu, u64 *raw)
649 {
650 struct amd_iommu_fault fault;
651
652 if (PPR_REQ_TYPE(raw[0]) != PPR_REQ_FAULT) {
653 pr_err_ratelimited("AMD-Vi: Unknown PPR request received\n");
654 return;
655 }
656
657 fault.address = raw[1];
658 fault.pasid = PPR_PASID(raw[0]);
659 fault.device_id = PPR_DEVID(raw[0]);
660 fault.tag = PPR_TAG(raw[0]);
661 fault.flags = PPR_FLAGS(raw[0]);
662
663 atomic_notifier_call_chain(&ppr_notifier, 0, &fault);
664 }
665
666 static void iommu_poll_ppr_log(struct amd_iommu *iommu)
667 {
668 u32 head, tail;
669
670 if (iommu->ppr_log == NULL)
671 return;
672
673 head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
674 tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
675
676 while (head != tail) {
677 volatile u64 *raw;
678 u64 entry[2];
679 int i;
680
681 raw = (u64 *)(iommu->ppr_log + head);
682
683 /*
684 * Hardware bug: Interrupt may arrive before the entry is
685 * written to memory. If this happens we need to wait for the
686 * entry to arrive.
687 */
688 for (i = 0; i < LOOP_TIMEOUT; ++i) {
689 if (PPR_REQ_TYPE(raw[0]) != 0)
690 break;
691 udelay(1);
692 }
693
694 /* Avoid memcpy function-call overhead */
695 entry[0] = raw[0];
696 entry[1] = raw[1];
697
698 /*
699 * To detect the hardware bug we need to clear the entry
700 * back to zero.
701 */
702 raw[0] = raw[1] = 0UL;
703
704 /* Update head pointer of hardware ring-buffer */
705 head = (head + PPR_ENTRY_SIZE) % PPR_LOG_SIZE;
706 writel(head, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
707
708 /* Handle PPR entry */
709 iommu_handle_ppr_entry(iommu, entry);
710
711 /* Refresh ring-buffer information */
712 head = readl(iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
713 tail = readl(iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
714 }
715 }
716
717 #ifdef CONFIG_IRQ_REMAP
718 static int (*iommu_ga_log_notifier)(u32);
719
720 int amd_iommu_register_ga_log_notifier(int (*notifier)(u32))
721 {
722 iommu_ga_log_notifier = notifier;
723
724 return 0;
725 }
726 EXPORT_SYMBOL(amd_iommu_register_ga_log_notifier);
727
728 static void iommu_poll_ga_log(struct amd_iommu *iommu)
729 {
730 u32 head, tail, cnt = 0;
731
732 if (iommu->ga_log == NULL)
733 return;
734
735 head = readl(iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
736 tail = readl(iommu->mmio_base + MMIO_GA_TAIL_OFFSET);
737
738 while (head != tail) {
739 volatile u64 *raw;
740 u64 log_entry;
741
742 raw = (u64 *)(iommu->ga_log + head);
743 cnt++;
744
745 /* Avoid memcpy function-call overhead */
746 log_entry = *raw;
747
748 /* Update head pointer of hardware ring-buffer */
749 head = (head + GA_ENTRY_SIZE) % GA_LOG_SIZE;
750 writel(head, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
751
752 /* Handle GA entry */
753 switch (GA_REQ_TYPE(log_entry)) {
754 case GA_GUEST_NR:
755 if (!iommu_ga_log_notifier)
756 break;
757
758 pr_debug("AMD-Vi: %s: devid=%#x, ga_tag=%#x\n",
759 __func__, GA_DEVID(log_entry),
760 GA_TAG(log_entry));
761
762 if (iommu_ga_log_notifier(GA_TAG(log_entry)) != 0)
763 pr_err("AMD-Vi: GA log notifier failed.\n");
764 break;
765 default:
766 break;
767 }
768 }
769 }
770 #endif /* CONFIG_IRQ_REMAP */
771
772 #define AMD_IOMMU_INT_MASK \
773 (MMIO_STATUS_EVT_INT_MASK | \
774 MMIO_STATUS_PPR_INT_MASK | \
775 MMIO_STATUS_GALOG_INT_MASK)
776
777 irqreturn_t amd_iommu_int_thread(int irq, void *data)
778 {
779 struct amd_iommu *iommu = (struct amd_iommu *) data;
780 u32 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
781
782 while (status & AMD_IOMMU_INT_MASK) {
783 /* Enable EVT and PPR and GA interrupts again */
784 writel(AMD_IOMMU_INT_MASK,
785 iommu->mmio_base + MMIO_STATUS_OFFSET);
786
787 if (status & MMIO_STATUS_EVT_INT_MASK) {
788 pr_devel("AMD-Vi: Processing IOMMU Event Log\n");
789 iommu_poll_events(iommu);
790 }
791
792 if (status & MMIO_STATUS_PPR_INT_MASK) {
793 pr_devel("AMD-Vi: Processing IOMMU PPR Log\n");
794 iommu_poll_ppr_log(iommu);
795 }
796
797 #ifdef CONFIG_IRQ_REMAP
798 if (status & MMIO_STATUS_GALOG_INT_MASK) {
799 pr_devel("AMD-Vi: Processing IOMMU GA Log\n");
800 iommu_poll_ga_log(iommu);
801 }
802 #endif
803
804 /*
805 * Hardware bug: ERBT1312
806 * When re-enabling interrupt (by writing 1
807 * to clear the bit), the hardware might also try to set
808 * the interrupt bit in the event status register.
809 * In this scenario, the bit will be set, and disable
810 * subsequent interrupts.
811 *
812 * Workaround: The IOMMU driver should read back the
813 * status register and check if the interrupt bits are cleared.
814 * If not, driver will need to go through the interrupt handler
815 * again and re-clear the bits
816 */
817 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
818 }
819 return IRQ_HANDLED;
820 }
821
822 irqreturn_t amd_iommu_int_handler(int irq, void *data)
823 {
824 return IRQ_WAKE_THREAD;
825 }
826
827 /****************************************************************************
828 *
829 * IOMMU command queuing functions
830 *
831 ****************************************************************************/
832
833 static int wait_on_sem(volatile u64 *sem)
834 {
835 int i = 0;
836
837 while (*sem == 0 && i < LOOP_TIMEOUT) {
838 udelay(1);
839 i += 1;
840 }
841
842 if (i == LOOP_TIMEOUT) {
843 pr_alert("AMD-Vi: Completion-Wait loop timed out\n");
844 return -EIO;
845 }
846
847 return 0;
848 }
849
850 static void copy_cmd_to_buffer(struct amd_iommu *iommu,
851 struct iommu_cmd *cmd,
852 u32 tail)
853 {
854 u8 *target;
855
856 target = iommu->cmd_buf + tail;
857 tail = (tail + sizeof(*cmd)) % CMD_BUFFER_SIZE;
858
859 /* Copy command to buffer */
860 memcpy(target, cmd, sizeof(*cmd));
861
862 /* Tell the IOMMU about it */
863 writel(tail, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
864 }
865
866 static void build_completion_wait(struct iommu_cmd *cmd, u64 address)
867 {
868 WARN_ON(address & 0x7ULL);
869
870 memset(cmd, 0, sizeof(*cmd));
871 cmd->data[0] = lower_32_bits(__pa(address)) | CMD_COMPL_WAIT_STORE_MASK;
872 cmd->data[1] = upper_32_bits(__pa(address));
873 cmd->data[2] = 1;
874 CMD_SET_TYPE(cmd, CMD_COMPL_WAIT);
875 }
876
877 static void build_inv_dte(struct iommu_cmd *cmd, u16 devid)
878 {
879 memset(cmd, 0, sizeof(*cmd));
880 cmd->data[0] = devid;
881 CMD_SET_TYPE(cmd, CMD_INV_DEV_ENTRY);
882 }
883
884 static void build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address,
885 size_t size, u16 domid, int pde)
886 {
887 u64 pages;
888 bool s;
889
890 pages = iommu_num_pages(address, size, PAGE_SIZE);
891 s = false;
892
893 if (pages > 1) {
894 /*
895 * If we have to flush more than one page, flush all
896 * TLB entries for this domain
897 */
898 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
899 s = true;
900 }
901
902 address &= PAGE_MASK;
903
904 memset(cmd, 0, sizeof(*cmd));
905 cmd->data[1] |= domid;
906 cmd->data[2] = lower_32_bits(address);
907 cmd->data[3] = upper_32_bits(address);
908 CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
909 if (s) /* size bit - we flush more than one 4kb page */
910 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
911 if (pde) /* PDE bit - we want to flush everything, not only the PTEs */
912 cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
913 }
914
915 static void build_inv_iotlb_pages(struct iommu_cmd *cmd, u16 devid, int qdep,
916 u64 address, size_t size)
917 {
918 u64 pages;
919 bool s;
920
921 pages = iommu_num_pages(address, size, PAGE_SIZE);
922 s = false;
923
924 if (pages > 1) {
925 /*
926 * If we have to flush more than one page, flush all
927 * TLB entries for this domain
928 */
929 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS;
930 s = true;
931 }
932
933 address &= PAGE_MASK;
934
935 memset(cmd, 0, sizeof(*cmd));
936 cmd->data[0] = devid;
937 cmd->data[0] |= (qdep & 0xff) << 24;
938 cmd->data[1] = devid;
939 cmd->data[2] = lower_32_bits(address);
940 cmd->data[3] = upper_32_bits(address);
941 CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
942 if (s)
943 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
944 }
945
946 static void build_inv_iommu_pasid(struct iommu_cmd *cmd, u16 domid, int pasid,
947 u64 address, bool size)
948 {
949 memset(cmd, 0, sizeof(*cmd));
950
951 address &= ~(0xfffULL);
952
953 cmd->data[0] = pasid;
954 cmd->data[1] = domid;
955 cmd->data[2] = lower_32_bits(address);
956 cmd->data[3] = upper_32_bits(address);
957 cmd->data[2] |= CMD_INV_IOMMU_PAGES_PDE_MASK;
958 cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK;
959 if (size)
960 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
961 CMD_SET_TYPE(cmd, CMD_INV_IOMMU_PAGES);
962 }
963
964 static void build_inv_iotlb_pasid(struct iommu_cmd *cmd, u16 devid, int pasid,
965 int qdep, u64 address, bool size)
966 {
967 memset(cmd, 0, sizeof(*cmd));
968
969 address &= ~(0xfffULL);
970
971 cmd->data[0] = devid;
972 cmd->data[0] |= ((pasid >> 8) & 0xff) << 16;
973 cmd->data[0] |= (qdep & 0xff) << 24;
974 cmd->data[1] = devid;
975 cmd->data[1] |= (pasid & 0xff) << 16;
976 cmd->data[2] = lower_32_bits(address);
977 cmd->data[2] |= CMD_INV_IOMMU_PAGES_GN_MASK;
978 cmd->data[3] = upper_32_bits(address);
979 if (size)
980 cmd->data[2] |= CMD_INV_IOMMU_PAGES_SIZE_MASK;
981 CMD_SET_TYPE(cmd, CMD_INV_IOTLB_PAGES);
982 }
983
984 static void build_complete_ppr(struct iommu_cmd *cmd, u16 devid, int pasid,
985 int status, int tag, bool gn)
986 {
987 memset(cmd, 0, sizeof(*cmd));
988
989 cmd->data[0] = devid;
990 if (gn) {
991 cmd->data[1] = pasid;
992 cmd->data[2] = CMD_INV_IOMMU_PAGES_GN_MASK;
993 }
994 cmd->data[3] = tag & 0x1ff;
995 cmd->data[3] |= (status & PPR_STATUS_MASK) << PPR_STATUS_SHIFT;
996
997 CMD_SET_TYPE(cmd, CMD_COMPLETE_PPR);
998 }
999
1000 static void build_inv_all(struct iommu_cmd *cmd)
1001 {
1002 memset(cmd, 0, sizeof(*cmd));
1003 CMD_SET_TYPE(cmd, CMD_INV_ALL);
1004 }
1005
1006 static void build_inv_irt(struct iommu_cmd *cmd, u16 devid)
1007 {
1008 memset(cmd, 0, sizeof(*cmd));
1009 cmd->data[0] = devid;
1010 CMD_SET_TYPE(cmd, CMD_INV_IRT);
1011 }
1012
1013 /*
1014 * Writes the command to the IOMMUs command buffer and informs the
1015 * hardware about the new command.
1016 */
1017 static int __iommu_queue_command_sync(struct amd_iommu *iommu,
1018 struct iommu_cmd *cmd,
1019 bool sync)
1020 {
1021 u32 left, tail, head, next_tail;
1022
1023 again:
1024
1025 head = readl(iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
1026 tail = readl(iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
1027 next_tail = (tail + sizeof(*cmd)) % CMD_BUFFER_SIZE;
1028 left = (head - next_tail) % CMD_BUFFER_SIZE;
1029
1030 if (left <= 2) {
1031 struct iommu_cmd sync_cmd;
1032 int ret;
1033
1034 iommu->cmd_sem = 0;
1035
1036 build_completion_wait(&sync_cmd, (u64)&iommu->cmd_sem);
1037 copy_cmd_to_buffer(iommu, &sync_cmd, tail);
1038
1039 if ((ret = wait_on_sem(&iommu->cmd_sem)) != 0)
1040 return ret;
1041
1042 goto again;
1043 }
1044
1045 copy_cmd_to_buffer(iommu, cmd, tail);
1046
1047 /* We need to sync now to make sure all commands are processed */
1048 iommu->need_sync = sync;
1049
1050 return 0;
1051 }
1052
1053 static int iommu_queue_command_sync(struct amd_iommu *iommu,
1054 struct iommu_cmd *cmd,
1055 bool sync)
1056 {
1057 unsigned long flags;
1058 int ret;
1059
1060 spin_lock_irqsave(&iommu->lock, flags);
1061 ret = __iommu_queue_command_sync(iommu, cmd, sync);
1062 spin_unlock_irqrestore(&iommu->lock, flags);
1063
1064 return ret;
1065 }
1066
1067 static int iommu_queue_command(struct amd_iommu *iommu, struct iommu_cmd *cmd)
1068 {
1069 return iommu_queue_command_sync(iommu, cmd, true);
1070 }
1071
1072 /*
1073 * This function queues a completion wait command into the command
1074 * buffer of an IOMMU
1075 */
1076 static int iommu_completion_wait(struct amd_iommu *iommu)
1077 {
1078 struct iommu_cmd cmd;
1079 unsigned long flags;
1080 int ret;
1081
1082 if (!iommu->need_sync)
1083 return 0;
1084
1085
1086 build_completion_wait(&cmd, (u64)&iommu->cmd_sem);
1087
1088 spin_lock_irqsave(&iommu->lock, flags);
1089
1090 iommu->cmd_sem = 0;
1091
1092 ret = __iommu_queue_command_sync(iommu, &cmd, false);
1093 if (ret)
1094 goto out_unlock;
1095
1096 ret = wait_on_sem(&iommu->cmd_sem);
1097
1098 out_unlock:
1099 spin_unlock_irqrestore(&iommu->lock, flags);
1100
1101 return ret;
1102 }
1103
1104 static int iommu_flush_dte(struct amd_iommu *iommu, u16 devid)
1105 {
1106 struct iommu_cmd cmd;
1107
1108 build_inv_dte(&cmd, devid);
1109
1110 return iommu_queue_command(iommu, &cmd);
1111 }
1112
1113 static void iommu_flush_dte_all(struct amd_iommu *iommu)
1114 {
1115 u32 devid;
1116
1117 for (devid = 0; devid <= 0xffff; ++devid)
1118 iommu_flush_dte(iommu, devid);
1119
1120 iommu_completion_wait(iommu);
1121 }
1122
1123 /*
1124 * This function uses heavy locking and may disable irqs for some time. But
1125 * this is no issue because it is only called during resume.
1126 */
1127 static void iommu_flush_tlb_all(struct amd_iommu *iommu)
1128 {
1129 u32 dom_id;
1130
1131 for (dom_id = 0; dom_id <= 0xffff; ++dom_id) {
1132 struct iommu_cmd cmd;
1133 build_inv_iommu_pages(&cmd, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
1134 dom_id, 1);
1135 iommu_queue_command(iommu, &cmd);
1136 }
1137
1138 iommu_completion_wait(iommu);
1139 }
1140
1141 static void iommu_flush_all(struct amd_iommu *iommu)
1142 {
1143 struct iommu_cmd cmd;
1144
1145 build_inv_all(&cmd);
1146
1147 iommu_queue_command(iommu, &cmd);
1148 iommu_completion_wait(iommu);
1149 }
1150
1151 static void iommu_flush_irt(struct amd_iommu *iommu, u16 devid)
1152 {
1153 struct iommu_cmd cmd;
1154
1155 build_inv_irt(&cmd, devid);
1156
1157 iommu_queue_command(iommu, &cmd);
1158 }
1159
1160 static void iommu_flush_irt_all(struct amd_iommu *iommu)
1161 {
1162 u32 devid;
1163
1164 for (devid = 0; devid <= MAX_DEV_TABLE_ENTRIES; devid++)
1165 iommu_flush_irt(iommu, devid);
1166
1167 iommu_completion_wait(iommu);
1168 }
1169
1170 void iommu_flush_all_caches(struct amd_iommu *iommu)
1171 {
1172 if (iommu_feature(iommu, FEATURE_IA)) {
1173 iommu_flush_all(iommu);
1174 } else {
1175 iommu_flush_dte_all(iommu);
1176 iommu_flush_irt_all(iommu);
1177 iommu_flush_tlb_all(iommu);
1178 }
1179 }
1180
1181 /*
1182 * Command send function for flushing on-device TLB
1183 */
1184 static int device_flush_iotlb(struct iommu_dev_data *dev_data,
1185 u64 address, size_t size)
1186 {
1187 struct amd_iommu *iommu;
1188 struct iommu_cmd cmd;
1189 int qdep;
1190
1191 qdep = dev_data->ats.qdep;
1192 iommu = amd_iommu_rlookup_table[dev_data->devid];
1193
1194 build_inv_iotlb_pages(&cmd, dev_data->devid, qdep, address, size);
1195
1196 return iommu_queue_command(iommu, &cmd);
1197 }
1198
1199 /*
1200 * Command send function for invalidating a device table entry
1201 */
1202 static int device_flush_dte(struct iommu_dev_data *dev_data)
1203 {
1204 struct amd_iommu *iommu;
1205 u16 alias;
1206 int ret;
1207
1208 iommu = amd_iommu_rlookup_table[dev_data->devid];
1209 alias = dev_data->alias;
1210
1211 ret = iommu_flush_dte(iommu, dev_data->devid);
1212 if (!ret && alias != dev_data->devid)
1213 ret = iommu_flush_dte(iommu, alias);
1214 if (ret)
1215 return ret;
1216
1217 if (dev_data->ats.enabled)
1218 ret = device_flush_iotlb(dev_data, 0, ~0UL);
1219
1220 return ret;
1221 }
1222
1223 /*
1224 * TLB invalidation function which is called from the mapping functions.
1225 * It invalidates a single PTE if the range to flush is within a single
1226 * page. Otherwise it flushes the whole TLB of the IOMMU.
1227 */
1228 static void __domain_flush_pages(struct protection_domain *domain,
1229 u64 address, size_t size, int pde)
1230 {
1231 struct iommu_dev_data *dev_data;
1232 struct iommu_cmd cmd;
1233 int ret = 0, i;
1234
1235 build_inv_iommu_pages(&cmd, address, size, domain->id, pde);
1236
1237 for (i = 0; i < amd_iommus_present; ++i) {
1238 if (!domain->dev_iommu[i])
1239 continue;
1240
1241 /*
1242 * Devices of this domain are behind this IOMMU
1243 * We need a TLB flush
1244 */
1245 ret |= iommu_queue_command(amd_iommus[i], &cmd);
1246 }
1247
1248 list_for_each_entry(dev_data, &domain->dev_list, list) {
1249
1250 if (!dev_data->ats.enabled)
1251 continue;
1252
1253 ret |= device_flush_iotlb(dev_data, address, size);
1254 }
1255
1256 WARN_ON(ret);
1257 }
1258
1259 static void domain_flush_pages(struct protection_domain *domain,
1260 u64 address, size_t size)
1261 {
1262 __domain_flush_pages(domain, address, size, 0);
1263 }
1264
1265 /* Flush the whole IO/TLB for a given protection domain */
1266 static void domain_flush_tlb(struct protection_domain *domain)
1267 {
1268 __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0);
1269 }
1270
1271 /* Flush the whole IO/TLB for a given protection domain - including PDE */
1272 static void domain_flush_tlb_pde(struct protection_domain *domain)
1273 {
1274 __domain_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1);
1275 }
1276
1277 static void domain_flush_complete(struct protection_domain *domain)
1278 {
1279 int i;
1280
1281 for (i = 0; i < amd_iommus_present; ++i) {
1282 if (domain && !domain->dev_iommu[i])
1283 continue;
1284
1285 /*
1286 * Devices of this domain are behind this IOMMU
1287 * We need to wait for completion of all commands.
1288 */
1289 iommu_completion_wait(amd_iommus[i]);
1290 }
1291 }
1292
1293
1294 /*
1295 * This function flushes the DTEs for all devices in domain
1296 */
1297 static void domain_flush_devices(struct protection_domain *domain)
1298 {
1299 struct iommu_dev_data *dev_data;
1300
1301 list_for_each_entry(dev_data, &domain->dev_list, list)
1302 device_flush_dte(dev_data);
1303 }
1304
1305 /****************************************************************************
1306 *
1307 * The functions below are used the create the page table mappings for
1308 * unity mapped regions.
1309 *
1310 ****************************************************************************/
1311
1312 /*
1313 * This function is used to add another level to an IO page table. Adding
1314 * another level increases the size of the address space by 9 bits to a size up
1315 * to 64 bits.
1316 */
1317 static bool increase_address_space(struct protection_domain *domain,
1318 gfp_t gfp)
1319 {
1320 u64 *pte;
1321
1322 if (domain->mode == PAGE_MODE_6_LEVEL)
1323 /* address space already 64 bit large */
1324 return false;
1325
1326 pte = (void *)get_zeroed_page(gfp);
1327 if (!pte)
1328 return false;
1329
1330 *pte = PM_LEVEL_PDE(domain->mode,
1331 virt_to_phys(domain->pt_root));
1332 domain->pt_root = pte;
1333 domain->mode += 1;
1334 domain->updated = true;
1335
1336 return true;
1337 }
1338
1339 static u64 *alloc_pte(struct protection_domain *domain,
1340 unsigned long address,
1341 unsigned long page_size,
1342 u64 **pte_page,
1343 gfp_t gfp)
1344 {
1345 int level, end_lvl;
1346 u64 *pte, *page;
1347
1348 BUG_ON(!is_power_of_2(page_size));
1349
1350 while (address > PM_LEVEL_SIZE(domain->mode))
1351 increase_address_space(domain, gfp);
1352
1353 level = domain->mode - 1;
1354 pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
1355 address = PAGE_SIZE_ALIGN(address, page_size);
1356 end_lvl = PAGE_SIZE_LEVEL(page_size);
1357
1358 while (level > end_lvl) {
1359 u64 __pte, __npte;
1360
1361 __pte = *pte;
1362
1363 if (!IOMMU_PTE_PRESENT(__pte)) {
1364 page = (u64 *)get_zeroed_page(gfp);
1365 if (!page)
1366 return NULL;
1367
1368 __npte = PM_LEVEL_PDE(level, virt_to_phys(page));
1369
1370 /* pte could have been changed somewhere. */
1371 if (cmpxchg64(pte, __pte, __npte) != __pte) {
1372 free_page((unsigned long)page);
1373 continue;
1374 }
1375 }
1376
1377 /* No level skipping support yet */
1378 if (PM_PTE_LEVEL(*pte) != level)
1379 return NULL;
1380
1381 level -= 1;
1382
1383 pte = IOMMU_PTE_PAGE(*pte);
1384
1385 if (pte_page && level == end_lvl)
1386 *pte_page = pte;
1387
1388 pte = &pte[PM_LEVEL_INDEX(level, address)];
1389 }
1390
1391 return pte;
1392 }
1393
1394 /*
1395 * This function checks if there is a PTE for a given dma address. If
1396 * there is one, it returns the pointer to it.
1397 */
1398 static u64 *fetch_pte(struct protection_domain *domain,
1399 unsigned long address,
1400 unsigned long *page_size)
1401 {
1402 int level;
1403 u64 *pte;
1404
1405 if (address > PM_LEVEL_SIZE(domain->mode))
1406 return NULL;
1407
1408 level = domain->mode - 1;
1409 pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
1410 *page_size = PTE_LEVEL_PAGE_SIZE(level);
1411
1412 while (level > 0) {
1413
1414 /* Not Present */
1415 if (!IOMMU_PTE_PRESENT(*pte))
1416 return NULL;
1417
1418 /* Large PTE */
1419 if (PM_PTE_LEVEL(*pte) == 7 ||
1420 PM_PTE_LEVEL(*pte) == 0)
1421 break;
1422
1423 /* No level skipping support yet */
1424 if (PM_PTE_LEVEL(*pte) != level)
1425 return NULL;
1426
1427 level -= 1;
1428
1429 /* Walk to the next level */
1430 pte = IOMMU_PTE_PAGE(*pte);
1431 pte = &pte[PM_LEVEL_INDEX(level, address)];
1432 *page_size = PTE_LEVEL_PAGE_SIZE(level);
1433 }
1434
1435 if (PM_PTE_LEVEL(*pte) == 0x07) {
1436 unsigned long pte_mask;
1437
1438 /*
1439 * If we have a series of large PTEs, make
1440 * sure to return a pointer to the first one.
1441 */
1442 *page_size = pte_mask = PTE_PAGE_SIZE(*pte);
1443 pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1);
1444 pte = (u64 *)(((unsigned long)pte) & pte_mask);
1445 }
1446
1447 return pte;
1448 }
1449
1450 /*
1451 * Generic mapping functions. It maps a physical address into a DMA
1452 * address space. It allocates the page table pages if necessary.
1453 * In the future it can be extended to a generic mapping function
1454 * supporting all features of AMD IOMMU page tables like level skipping
1455 * and full 64 bit address spaces.
1456 */
1457 static int iommu_map_page(struct protection_domain *dom,
1458 unsigned long bus_addr,
1459 unsigned long phys_addr,
1460 unsigned long page_size,
1461 int prot,
1462 gfp_t gfp)
1463 {
1464 u64 __pte, *pte;
1465 int i, count;
1466
1467 BUG_ON(!IS_ALIGNED(bus_addr, page_size));
1468 BUG_ON(!IS_ALIGNED(phys_addr, page_size));
1469
1470 if (!(prot & IOMMU_PROT_MASK))
1471 return -EINVAL;
1472
1473 count = PAGE_SIZE_PTE_COUNT(page_size);
1474 pte = alloc_pte(dom, bus_addr, page_size, NULL, gfp);
1475
1476 if (!pte)
1477 return -ENOMEM;
1478
1479 for (i = 0; i < count; ++i)
1480 if (IOMMU_PTE_PRESENT(pte[i]))
1481 return -EBUSY;
1482
1483 if (count > 1) {
1484 __pte = PAGE_SIZE_PTE(phys_addr, page_size);
1485 __pte |= PM_LEVEL_ENC(7) | IOMMU_PTE_P | IOMMU_PTE_FC;
1486 } else
1487 __pte = phys_addr | IOMMU_PTE_P | IOMMU_PTE_FC;
1488
1489 if (prot & IOMMU_PROT_IR)
1490 __pte |= IOMMU_PTE_IR;
1491 if (prot & IOMMU_PROT_IW)
1492 __pte |= IOMMU_PTE_IW;
1493
1494 for (i = 0; i < count; ++i)
1495 pte[i] = __pte;
1496
1497 update_domain(dom);
1498
1499 return 0;
1500 }
1501
1502 static unsigned long iommu_unmap_page(struct protection_domain *dom,
1503 unsigned long bus_addr,
1504 unsigned long page_size)
1505 {
1506 unsigned long long unmapped;
1507 unsigned long unmap_size;
1508 u64 *pte;
1509
1510 BUG_ON(!is_power_of_2(page_size));
1511
1512 unmapped = 0;
1513
1514 while (unmapped < page_size) {
1515
1516 pte = fetch_pte(dom, bus_addr, &unmap_size);
1517
1518 if (pte) {
1519 int i, count;
1520
1521 count = PAGE_SIZE_PTE_COUNT(unmap_size);
1522 for (i = 0; i < count; i++)
1523 pte[i] = 0ULL;
1524 }
1525
1526 bus_addr = (bus_addr & ~(unmap_size - 1)) + unmap_size;
1527 unmapped += unmap_size;
1528 }
1529
1530 BUG_ON(unmapped && !is_power_of_2(unmapped));
1531
1532 return unmapped;
1533 }
1534
1535 /****************************************************************************
1536 *
1537 * The next functions belong to the address allocator for the dma_ops
1538 * interface functions.
1539 *
1540 ****************************************************************************/
1541
1542
1543 static unsigned long dma_ops_alloc_iova(struct device *dev,
1544 struct dma_ops_domain *dma_dom,
1545 unsigned int pages, u64 dma_mask)
1546 {
1547 unsigned long pfn = 0;
1548
1549 pages = __roundup_pow_of_two(pages);
1550
1551 if (dma_mask > DMA_BIT_MASK(32))
1552 pfn = alloc_iova_fast(&dma_dom->iovad, pages,
1553 IOVA_PFN(DMA_BIT_MASK(32)));
1554
1555 if (!pfn)
1556 pfn = alloc_iova_fast(&dma_dom->iovad, pages, IOVA_PFN(dma_mask));
1557
1558 return (pfn << PAGE_SHIFT);
1559 }
1560
1561 static void dma_ops_free_iova(struct dma_ops_domain *dma_dom,
1562 unsigned long address,
1563 unsigned int pages)
1564 {
1565 pages = __roundup_pow_of_two(pages);
1566 address >>= PAGE_SHIFT;
1567
1568 free_iova_fast(&dma_dom->iovad, address, pages);
1569 }
1570
1571 /****************************************************************************
1572 *
1573 * The next functions belong to the domain allocation. A domain is
1574 * allocated for every IOMMU as the default domain. If device isolation
1575 * is enabled, every device get its own domain. The most important thing
1576 * about domains is the page table mapping the DMA address space they
1577 * contain.
1578 *
1579 ****************************************************************************/
1580
1581 /*
1582 * This function adds a protection domain to the global protection domain list
1583 */
1584 static void add_domain_to_list(struct protection_domain *domain)
1585 {
1586 unsigned long flags;
1587
1588 spin_lock_irqsave(&amd_iommu_pd_lock, flags);
1589 list_add(&domain->list, &amd_iommu_pd_list);
1590 spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
1591 }
1592
1593 /*
1594 * This function removes a protection domain to the global
1595 * protection domain list
1596 */
1597 static void del_domain_from_list(struct protection_domain *domain)
1598 {
1599 unsigned long flags;
1600
1601 spin_lock_irqsave(&amd_iommu_pd_lock, flags);
1602 list_del(&domain->list);
1603 spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
1604 }
1605
1606 static u16 domain_id_alloc(void)
1607 {
1608 unsigned long flags;
1609 int id;
1610
1611 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1612 id = find_first_zero_bit(amd_iommu_pd_alloc_bitmap, MAX_DOMAIN_ID);
1613 BUG_ON(id == 0);
1614 if (id > 0 && id < MAX_DOMAIN_ID)
1615 __set_bit(id, amd_iommu_pd_alloc_bitmap);
1616 else
1617 id = 0;
1618 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1619
1620 return id;
1621 }
1622
1623 static void domain_id_free(int id)
1624 {
1625 unsigned long flags;
1626
1627 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
1628 if (id > 0 && id < MAX_DOMAIN_ID)
1629 __clear_bit(id, amd_iommu_pd_alloc_bitmap);
1630 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
1631 }
1632
1633 #define DEFINE_FREE_PT_FN(LVL, FN) \
1634 static void free_pt_##LVL (unsigned long __pt) \
1635 { \
1636 unsigned long p; \
1637 u64 *pt; \
1638 int i; \
1639 \
1640 pt = (u64 *)__pt; \
1641 \
1642 for (i = 0; i < 512; ++i) { \
1643 /* PTE present? */ \
1644 if (!IOMMU_PTE_PRESENT(pt[i])) \
1645 continue; \
1646 \
1647 /* Large PTE? */ \
1648 if (PM_PTE_LEVEL(pt[i]) == 0 || \
1649 PM_PTE_LEVEL(pt[i]) == 7) \
1650 continue; \
1651 \
1652 p = (unsigned long)IOMMU_PTE_PAGE(pt[i]); \
1653 FN(p); \
1654 } \
1655 free_page((unsigned long)pt); \
1656 }
1657
1658 DEFINE_FREE_PT_FN(l2, free_page)
1659 DEFINE_FREE_PT_FN(l3, free_pt_l2)
1660 DEFINE_FREE_PT_FN(l4, free_pt_l3)
1661 DEFINE_FREE_PT_FN(l5, free_pt_l4)
1662 DEFINE_FREE_PT_FN(l6, free_pt_l5)
1663
1664 static void free_pagetable(struct protection_domain *domain)
1665 {
1666 unsigned long root = (unsigned long)domain->pt_root;
1667
1668 switch (domain->mode) {
1669 case PAGE_MODE_NONE:
1670 break;
1671 case PAGE_MODE_1_LEVEL:
1672 free_page(root);
1673 break;
1674 case PAGE_MODE_2_LEVEL:
1675 free_pt_l2(root);
1676 break;
1677 case PAGE_MODE_3_LEVEL:
1678 free_pt_l3(root);
1679 break;
1680 case PAGE_MODE_4_LEVEL:
1681 free_pt_l4(root);
1682 break;
1683 case PAGE_MODE_5_LEVEL:
1684 free_pt_l5(root);
1685 break;
1686 case PAGE_MODE_6_LEVEL:
1687 free_pt_l6(root);
1688 break;
1689 default:
1690 BUG();
1691 }
1692 }
1693
1694 static void free_gcr3_tbl_level1(u64 *tbl)
1695 {
1696 u64 *ptr;
1697 int i;
1698
1699 for (i = 0; i < 512; ++i) {
1700 if (!(tbl[i] & GCR3_VALID))
1701 continue;
1702
1703 ptr = __va(tbl[i] & PAGE_MASK);
1704
1705 free_page((unsigned long)ptr);
1706 }
1707 }
1708
1709 static void free_gcr3_tbl_level2(u64 *tbl)
1710 {
1711 u64 *ptr;
1712 int i;
1713
1714 for (i = 0; i < 512; ++i) {
1715 if (!(tbl[i] & GCR3_VALID))
1716 continue;
1717
1718 ptr = __va(tbl[i] & PAGE_MASK);
1719
1720 free_gcr3_tbl_level1(ptr);
1721 }
1722 }
1723
1724 static void free_gcr3_table(struct protection_domain *domain)
1725 {
1726 if (domain->glx == 2)
1727 free_gcr3_tbl_level2(domain->gcr3_tbl);
1728 else if (domain->glx == 1)
1729 free_gcr3_tbl_level1(domain->gcr3_tbl);
1730 else
1731 BUG_ON(domain->glx != 0);
1732
1733 free_page((unsigned long)domain->gcr3_tbl);
1734 }
1735
1736 /*
1737 * Free a domain, only used if something went wrong in the
1738 * allocation path and we need to free an already allocated page table
1739 */
1740 static void dma_ops_domain_free(struct dma_ops_domain *dom)
1741 {
1742 if (!dom)
1743 return;
1744
1745 del_domain_from_list(&dom->domain);
1746
1747 put_iova_domain(&dom->iovad);
1748
1749 free_pagetable(&dom->domain);
1750
1751 if (dom->domain.id)
1752 domain_id_free(dom->domain.id);
1753
1754 kfree(dom);
1755 }
1756
1757 /*
1758 * Allocates a new protection domain usable for the dma_ops functions.
1759 * It also initializes the page table and the address allocator data
1760 * structures required for the dma_ops interface
1761 */
1762 static struct dma_ops_domain *dma_ops_domain_alloc(void)
1763 {
1764 struct dma_ops_domain *dma_dom;
1765
1766 dma_dom = kzalloc(sizeof(struct dma_ops_domain), GFP_KERNEL);
1767 if (!dma_dom)
1768 return NULL;
1769
1770 if (protection_domain_init(&dma_dom->domain))
1771 goto free_dma_dom;
1772
1773 dma_dom->domain.mode = PAGE_MODE_3_LEVEL;
1774 dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL);
1775 dma_dom->domain.flags = PD_DMA_OPS_MASK;
1776 if (!dma_dom->domain.pt_root)
1777 goto free_dma_dom;
1778
1779 init_iova_domain(&dma_dom->iovad, PAGE_SIZE,
1780 IOVA_START_PFN, DMA_32BIT_PFN);
1781
1782 /* Initialize reserved ranges */
1783 copy_reserved_iova(&reserved_iova_ranges, &dma_dom->iovad);
1784
1785 add_domain_to_list(&dma_dom->domain);
1786
1787 return dma_dom;
1788
1789 free_dma_dom:
1790 dma_ops_domain_free(dma_dom);
1791
1792 return NULL;
1793 }
1794
1795 /*
1796 * little helper function to check whether a given protection domain is a
1797 * dma_ops domain
1798 */
1799 static bool dma_ops_domain(struct protection_domain *domain)
1800 {
1801 return domain->flags & PD_DMA_OPS_MASK;
1802 }
1803
1804 static void set_dte_entry(u16 devid, struct protection_domain *domain, bool ats)
1805 {
1806 u64 pte_root = 0;
1807 u64 flags = 0;
1808
1809 if (domain->mode != PAGE_MODE_NONE)
1810 pte_root = virt_to_phys(domain->pt_root);
1811
1812 pte_root |= (domain->mode & DEV_ENTRY_MODE_MASK)
1813 << DEV_ENTRY_MODE_SHIFT;
1814 pte_root |= IOMMU_PTE_IR | IOMMU_PTE_IW | IOMMU_PTE_P | IOMMU_PTE_TV;
1815
1816 flags = amd_iommu_dev_table[devid].data[1];
1817
1818 if (ats)
1819 flags |= DTE_FLAG_IOTLB;
1820
1821 if (domain->flags & PD_IOMMUV2_MASK) {
1822 u64 gcr3 = __pa(domain->gcr3_tbl);
1823 u64 glx = domain->glx;
1824 u64 tmp;
1825
1826 pte_root |= DTE_FLAG_GV;
1827 pte_root |= (glx & DTE_GLX_MASK) << DTE_GLX_SHIFT;
1828
1829 /* First mask out possible old values for GCR3 table */
1830 tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
1831 flags &= ~tmp;
1832
1833 tmp = DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
1834 flags &= ~tmp;
1835
1836 /* Encode GCR3 table into DTE */
1837 tmp = DTE_GCR3_VAL_A(gcr3) << DTE_GCR3_SHIFT_A;
1838 pte_root |= tmp;
1839
1840 tmp = DTE_GCR3_VAL_B(gcr3) << DTE_GCR3_SHIFT_B;
1841 flags |= tmp;
1842
1843 tmp = DTE_GCR3_VAL_C(gcr3) << DTE_GCR3_SHIFT_C;
1844 flags |= tmp;
1845 }
1846
1847 flags &= ~(0xffffUL);
1848 flags |= domain->id;
1849
1850 amd_iommu_dev_table[devid].data[1] = flags;
1851 amd_iommu_dev_table[devid].data[0] = pte_root;
1852 }
1853
1854 static void clear_dte_entry(u16 devid)
1855 {
1856 /* remove entry from the device table seen by the hardware */
1857 amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV;
1858 amd_iommu_dev_table[devid].data[1] &= DTE_FLAG_MASK;
1859
1860 amd_iommu_apply_erratum_63(devid);
1861 }
1862
1863 static void do_attach(struct iommu_dev_data *dev_data,
1864 struct protection_domain *domain)
1865 {
1866 struct amd_iommu *iommu;
1867 u16 alias;
1868 bool ats;
1869
1870 iommu = amd_iommu_rlookup_table[dev_data->devid];
1871 alias = dev_data->alias;
1872 ats = dev_data->ats.enabled;
1873
1874 /* Update data structures */
1875 dev_data->domain = domain;
1876 list_add(&dev_data->list, &domain->dev_list);
1877
1878 /* Do reference counting */
1879 domain->dev_iommu[iommu->index] += 1;
1880 domain->dev_cnt += 1;
1881
1882 /* Update device table */
1883 set_dte_entry(dev_data->devid, domain, ats);
1884 if (alias != dev_data->devid)
1885 set_dte_entry(alias, domain, ats);
1886
1887 device_flush_dte(dev_data);
1888 }
1889
1890 static void do_detach(struct iommu_dev_data *dev_data)
1891 {
1892 struct amd_iommu *iommu;
1893 u16 alias;
1894
1895 /*
1896 * First check if the device is still attached. It might already
1897 * be detached from its domain because the generic
1898 * iommu_detach_group code detached it and we try again here in
1899 * our alias handling.
1900 */
1901 if (!dev_data->domain)
1902 return;
1903
1904 iommu = amd_iommu_rlookup_table[dev_data->devid];
1905 alias = dev_data->alias;
1906
1907 /* decrease reference counters */
1908 dev_data->domain->dev_iommu[iommu->index] -= 1;
1909 dev_data->domain->dev_cnt -= 1;
1910
1911 /* Update data structures */
1912 dev_data->domain = NULL;
1913 list_del(&dev_data->list);
1914 clear_dte_entry(dev_data->devid);
1915 if (alias != dev_data->devid)
1916 clear_dte_entry(alias);
1917
1918 /* Flush the DTE entry */
1919 device_flush_dte(dev_data);
1920 }
1921
1922 /*
1923 * If a device is not yet associated with a domain, this function does
1924 * assigns it visible for the hardware
1925 */
1926 static int __attach_device(struct iommu_dev_data *dev_data,
1927 struct protection_domain *domain)
1928 {
1929 int ret;
1930
1931 /*
1932 * Must be called with IRQs disabled. Warn here to detect early
1933 * when its not.
1934 */
1935 WARN_ON(!irqs_disabled());
1936
1937 /* lock domain */
1938 spin_lock(&domain->lock);
1939
1940 ret = -EBUSY;
1941 if (dev_data->domain != NULL)
1942 goto out_unlock;
1943
1944 /* Attach alias group root */
1945 do_attach(dev_data, domain);
1946
1947 ret = 0;
1948
1949 out_unlock:
1950
1951 /* ready */
1952 spin_unlock(&domain->lock);
1953
1954 return ret;
1955 }
1956
1957
1958 static void pdev_iommuv2_disable(struct pci_dev *pdev)
1959 {
1960 pci_disable_ats(pdev);
1961 pci_disable_pri(pdev);
1962 pci_disable_pasid(pdev);
1963 }
1964
1965 /* FIXME: Change generic reset-function to do the same */
1966 static int pri_reset_while_enabled(struct pci_dev *pdev)
1967 {
1968 u16 control;
1969 int pos;
1970
1971 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
1972 if (!pos)
1973 return -EINVAL;
1974
1975 pci_read_config_word(pdev, pos + PCI_PRI_CTRL, &control);
1976 control |= PCI_PRI_CTRL_RESET;
1977 pci_write_config_word(pdev, pos + PCI_PRI_CTRL, control);
1978
1979 return 0;
1980 }
1981
1982 static int pdev_iommuv2_enable(struct pci_dev *pdev)
1983 {
1984 bool reset_enable;
1985 int reqs, ret;
1986
1987 /* FIXME: Hardcode number of outstanding requests for now */
1988 reqs = 32;
1989 if (pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_LIMIT_REQ_ONE))
1990 reqs = 1;
1991 reset_enable = pdev_pri_erratum(pdev, AMD_PRI_DEV_ERRATUM_ENABLE_RESET);
1992
1993 /* Only allow access to user-accessible pages */
1994 ret = pci_enable_pasid(pdev, 0);
1995 if (ret)
1996 goto out_err;
1997
1998 /* First reset the PRI state of the device */
1999 ret = pci_reset_pri(pdev);
2000 if (ret)
2001 goto out_err;
2002
2003 /* Enable PRI */
2004 ret = pci_enable_pri(pdev, reqs);
2005 if (ret)
2006 goto out_err;
2007
2008 if (reset_enable) {
2009 ret = pri_reset_while_enabled(pdev);
2010 if (ret)
2011 goto out_err;
2012 }
2013
2014 ret = pci_enable_ats(pdev, PAGE_SHIFT);
2015 if (ret)
2016 goto out_err;
2017
2018 return 0;
2019
2020 out_err:
2021 pci_disable_pri(pdev);
2022 pci_disable_pasid(pdev);
2023
2024 return ret;
2025 }
2026
2027 /* FIXME: Move this to PCI code */
2028 #define PCI_PRI_TLP_OFF (1 << 15)
2029
2030 static bool pci_pri_tlp_required(struct pci_dev *pdev)
2031 {
2032 u16 status;
2033 int pos;
2034
2035 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
2036 if (!pos)
2037 return false;
2038
2039 pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status);
2040
2041 return (status & PCI_PRI_TLP_OFF) ? true : false;
2042 }
2043
2044 /*
2045 * If a device is not yet associated with a domain, this function
2046 * assigns it visible for the hardware
2047 */
2048 static int attach_device(struct device *dev,
2049 struct protection_domain *domain)
2050 {
2051 struct pci_dev *pdev;
2052 struct iommu_dev_data *dev_data;
2053 unsigned long flags;
2054 int ret;
2055
2056 dev_data = get_dev_data(dev);
2057
2058 if (!dev_is_pci(dev))
2059 goto skip_ats_check;
2060
2061 pdev = to_pci_dev(dev);
2062 if (domain->flags & PD_IOMMUV2_MASK) {
2063 if (!dev_data->passthrough)
2064 return -EINVAL;
2065
2066 if (dev_data->iommu_v2) {
2067 if (pdev_iommuv2_enable(pdev) != 0)
2068 return -EINVAL;
2069
2070 dev_data->ats.enabled = true;
2071 dev_data->ats.qdep = pci_ats_queue_depth(pdev);
2072 dev_data->pri_tlp = pci_pri_tlp_required(pdev);
2073 }
2074 } else if (amd_iommu_iotlb_sup &&
2075 pci_enable_ats(pdev, PAGE_SHIFT) == 0) {
2076 dev_data->ats.enabled = true;
2077 dev_data->ats.qdep = pci_ats_queue_depth(pdev);
2078 }
2079
2080 skip_ats_check:
2081 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
2082 ret = __attach_device(dev_data, domain);
2083 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
2084
2085 /*
2086 * We might boot into a crash-kernel here. The crashed kernel
2087 * left the caches in the IOMMU dirty. So we have to flush
2088 * here to evict all dirty stuff.
2089 */
2090 domain_flush_tlb_pde(domain);
2091
2092 return ret;
2093 }
2094
2095 /*
2096 * Removes a device from a protection domain (unlocked)
2097 */
2098 static void __detach_device(struct iommu_dev_data *dev_data)
2099 {
2100 struct protection_domain *domain;
2101
2102 /*
2103 * Must be called with IRQs disabled. Warn here to detect early
2104 * when its not.
2105 */
2106 WARN_ON(!irqs_disabled());
2107
2108 if (WARN_ON(!dev_data->domain))
2109 return;
2110
2111 domain = dev_data->domain;
2112
2113 spin_lock(&domain->lock);
2114
2115 do_detach(dev_data);
2116
2117 spin_unlock(&domain->lock);
2118 }
2119
2120 /*
2121 * Removes a device from a protection domain (with devtable_lock held)
2122 */
2123 static void detach_device(struct device *dev)
2124 {
2125 struct protection_domain *domain;
2126 struct iommu_dev_data *dev_data;
2127 unsigned long flags;
2128
2129 dev_data = get_dev_data(dev);
2130 domain = dev_data->domain;
2131
2132 /* lock device table */
2133 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
2134 __detach_device(dev_data);
2135 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
2136
2137 if (!dev_is_pci(dev))
2138 return;
2139
2140 if (domain->flags & PD_IOMMUV2_MASK && dev_data->iommu_v2)
2141 pdev_iommuv2_disable(to_pci_dev(dev));
2142 else if (dev_data->ats.enabled)
2143 pci_disable_ats(to_pci_dev(dev));
2144
2145 dev_data->ats.enabled = false;
2146 }
2147
2148 static int amd_iommu_add_device(struct device *dev)
2149 {
2150 struct iommu_dev_data *dev_data;
2151 struct iommu_domain *domain;
2152 struct amd_iommu *iommu;
2153 int ret, devid;
2154
2155 if (!check_device(dev) || get_dev_data(dev))
2156 return 0;
2157
2158 devid = get_device_id(dev);
2159 if (devid < 0)
2160 return devid;
2161
2162 iommu = amd_iommu_rlookup_table[devid];
2163
2164 ret = iommu_init_device(dev);
2165 if (ret) {
2166 if (ret != -ENOTSUPP)
2167 pr_err("Failed to initialize device %s - trying to proceed anyway\n",
2168 dev_name(dev));
2169
2170 iommu_ignore_device(dev);
2171 dev->archdata.dma_ops = &nommu_dma_ops;
2172 goto out;
2173 }
2174 init_iommu_group(dev);
2175
2176 dev_data = get_dev_data(dev);
2177
2178 BUG_ON(!dev_data);
2179
2180 if (iommu_pass_through || dev_data->iommu_v2)
2181 iommu_request_dm_for_dev(dev);
2182
2183 /* Domains are initialized for this device - have a look what we ended up with */
2184 domain = iommu_get_domain_for_dev(dev);
2185 if (domain->type == IOMMU_DOMAIN_IDENTITY)
2186 dev_data->passthrough = true;
2187 else
2188 dev->archdata.dma_ops = &amd_iommu_dma_ops;
2189
2190 out:
2191 iommu_completion_wait(iommu);
2192
2193 return 0;
2194 }
2195
2196 static void amd_iommu_remove_device(struct device *dev)
2197 {
2198 struct amd_iommu *iommu;
2199 int devid;
2200
2201 if (!check_device(dev))
2202 return;
2203
2204 devid = get_device_id(dev);
2205 if (devid < 0)
2206 return;
2207
2208 iommu = amd_iommu_rlookup_table[devid];
2209
2210 iommu_uninit_device(dev);
2211 iommu_completion_wait(iommu);
2212 }
2213
2214 static struct iommu_group *amd_iommu_device_group(struct device *dev)
2215 {
2216 if (dev_is_pci(dev))
2217 return pci_device_group(dev);
2218
2219 return acpihid_device_group(dev);
2220 }
2221
2222 /*****************************************************************************
2223 *
2224 * The next functions belong to the dma_ops mapping/unmapping code.
2225 *
2226 *****************************************************************************/
2227
2228 static void __queue_flush(struct flush_queue *queue)
2229 {
2230 struct protection_domain *domain;
2231 unsigned long flags;
2232 int idx;
2233
2234 /* First flush TLB of all known domains */
2235 spin_lock_irqsave(&amd_iommu_pd_lock, flags);
2236 list_for_each_entry(domain, &amd_iommu_pd_list, list)
2237 domain_flush_tlb(domain);
2238 spin_unlock_irqrestore(&amd_iommu_pd_lock, flags);
2239
2240 /* Wait until flushes have completed */
2241 domain_flush_complete(NULL);
2242
2243 for (idx = 0; idx < queue->next; ++idx) {
2244 struct flush_queue_entry *entry;
2245
2246 entry = queue->entries + idx;
2247
2248 free_iova_fast(&entry->dma_dom->iovad,
2249 entry->iova_pfn,
2250 entry->pages);
2251
2252 /* Not really necessary, just to make sure we catch any bugs */
2253 entry->dma_dom = NULL;
2254 }
2255
2256 queue->next = 0;
2257 }
2258
2259 static void queue_flush_all(void)
2260 {
2261 int cpu;
2262
2263 for_each_possible_cpu(cpu) {
2264 struct flush_queue *queue;
2265 unsigned long flags;
2266
2267 queue = per_cpu_ptr(&flush_queue, cpu);
2268 spin_lock_irqsave(&queue->lock, flags);
2269 if (queue->next > 0)
2270 __queue_flush(queue);
2271 spin_unlock_irqrestore(&queue->lock, flags);
2272 }
2273 }
2274
2275 static void queue_flush_timeout(unsigned long unsused)
2276 {
2277 atomic_set(&queue_timer_on, 0);
2278 queue_flush_all();
2279 }
2280
2281 static void queue_add(struct dma_ops_domain *dma_dom,
2282 unsigned long address, unsigned long pages)
2283 {
2284 struct flush_queue_entry *entry;
2285 struct flush_queue *queue;
2286 unsigned long flags;
2287 int idx;
2288
2289 pages = __roundup_pow_of_two(pages);
2290 address >>= PAGE_SHIFT;
2291
2292 queue = get_cpu_ptr(&flush_queue);
2293 spin_lock_irqsave(&queue->lock, flags);
2294
2295 if (queue->next == FLUSH_QUEUE_SIZE)
2296 __queue_flush(queue);
2297
2298 idx = queue->next++;
2299 entry = queue->entries + idx;
2300
2301 entry->iova_pfn = address;
2302 entry->pages = pages;
2303 entry->dma_dom = dma_dom;
2304
2305 spin_unlock_irqrestore(&queue->lock, flags);
2306
2307 if (atomic_cmpxchg(&queue_timer_on, 0, 1) == 0)
2308 mod_timer(&queue_timer, jiffies + msecs_to_jiffies(10));
2309
2310 put_cpu_ptr(&flush_queue);
2311 }
2312
2313
2314 /*
2315 * In the dma_ops path we only have the struct device. This function
2316 * finds the corresponding IOMMU, the protection domain and the
2317 * requestor id for a given device.
2318 * If the device is not yet associated with a domain this is also done
2319 * in this function.
2320 */
2321 static struct protection_domain *get_domain(struct device *dev)
2322 {
2323 struct protection_domain *domain;
2324
2325 if (!check_device(dev))
2326 return ERR_PTR(-EINVAL);
2327
2328 domain = get_dev_data(dev)->domain;
2329 if (!dma_ops_domain(domain))
2330 return ERR_PTR(-EBUSY);
2331
2332 return domain;
2333 }
2334
2335 static void update_device_table(struct protection_domain *domain)
2336 {
2337 struct iommu_dev_data *dev_data;
2338
2339 list_for_each_entry(dev_data, &domain->dev_list, list) {
2340 set_dte_entry(dev_data->devid, domain, dev_data->ats.enabled);
2341
2342 if (dev_data->devid == dev_data->alias)
2343 continue;
2344
2345 /* There is an alias, update device table entry for it */
2346 set_dte_entry(dev_data->alias, domain, dev_data->ats.enabled);
2347 }
2348 }
2349
2350 static void update_domain(struct protection_domain *domain)
2351 {
2352 if (!domain->updated)
2353 return;
2354
2355 update_device_table(domain);
2356
2357 domain_flush_devices(domain);
2358 domain_flush_tlb_pde(domain);
2359
2360 domain->updated = false;
2361 }
2362
2363 static int dir2prot(enum dma_data_direction direction)
2364 {
2365 if (direction == DMA_TO_DEVICE)
2366 return IOMMU_PROT_IR;
2367 else if (direction == DMA_FROM_DEVICE)
2368 return IOMMU_PROT_IW;
2369 else if (direction == DMA_BIDIRECTIONAL)
2370 return IOMMU_PROT_IW | IOMMU_PROT_IR;
2371 else
2372 return 0;
2373 }
2374 /*
2375 * This function contains common code for mapping of a physically
2376 * contiguous memory region into DMA address space. It is used by all
2377 * mapping functions provided with this IOMMU driver.
2378 * Must be called with the domain lock held.
2379 */
2380 static dma_addr_t __map_single(struct device *dev,
2381 struct dma_ops_domain *dma_dom,
2382 phys_addr_t paddr,
2383 size_t size,
2384 enum dma_data_direction direction,
2385 u64 dma_mask)
2386 {
2387 dma_addr_t offset = paddr & ~PAGE_MASK;
2388 dma_addr_t address, start, ret;
2389 unsigned int pages;
2390 int prot = 0;
2391 int i;
2392
2393 pages = iommu_num_pages(paddr, size, PAGE_SIZE);
2394 paddr &= PAGE_MASK;
2395
2396 address = dma_ops_alloc_iova(dev, dma_dom, pages, dma_mask);
2397 if (address == DMA_ERROR_CODE)
2398 goto out;
2399
2400 prot = dir2prot(direction);
2401
2402 start = address;
2403 for (i = 0; i < pages; ++i) {
2404 ret = iommu_map_page(&dma_dom->domain, start, paddr,
2405 PAGE_SIZE, prot, GFP_ATOMIC);
2406 if (ret)
2407 goto out_unmap;
2408
2409 paddr += PAGE_SIZE;
2410 start += PAGE_SIZE;
2411 }
2412 address += offset;
2413
2414 if (unlikely(amd_iommu_np_cache)) {
2415 domain_flush_pages(&dma_dom->domain, address, size);
2416 domain_flush_complete(&dma_dom->domain);
2417 }
2418
2419 out:
2420 return address;
2421
2422 out_unmap:
2423
2424 for (--i; i >= 0; --i) {
2425 start -= PAGE_SIZE;
2426 iommu_unmap_page(&dma_dom->domain, start, PAGE_SIZE);
2427 }
2428
2429 domain_flush_tlb(&dma_dom->domain);
2430 domain_flush_complete(&dma_dom->domain);
2431
2432 dma_ops_free_iova(dma_dom, address, pages);
2433
2434 return DMA_ERROR_CODE;
2435 }
2436
2437 /*
2438 * Does the reverse of the __map_single function. Must be called with
2439 * the domain lock held too
2440 */
2441 static void __unmap_single(struct dma_ops_domain *dma_dom,
2442 dma_addr_t dma_addr,
2443 size_t size,
2444 int dir)
2445 {
2446 dma_addr_t flush_addr;
2447 dma_addr_t i, start;
2448 unsigned int pages;
2449
2450 flush_addr = dma_addr;
2451 pages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
2452 dma_addr &= PAGE_MASK;
2453 start = dma_addr;
2454
2455 for (i = 0; i < pages; ++i) {
2456 iommu_unmap_page(&dma_dom->domain, start, PAGE_SIZE);
2457 start += PAGE_SIZE;
2458 }
2459
2460 if (amd_iommu_unmap_flush) {
2461 dma_ops_free_iova(dma_dom, dma_addr, pages);
2462 domain_flush_tlb(&dma_dom->domain);
2463 domain_flush_complete(&dma_dom->domain);
2464 } else {
2465 queue_add(dma_dom, dma_addr, pages);
2466 }
2467 }
2468
2469 /*
2470 * The exported map_single function for dma_ops.
2471 */
2472 static dma_addr_t map_page(struct device *dev, struct page *page,
2473 unsigned long offset, size_t size,
2474 enum dma_data_direction dir,
2475 unsigned long attrs)
2476 {
2477 phys_addr_t paddr = page_to_phys(page) + offset;
2478 struct protection_domain *domain;
2479 struct dma_ops_domain *dma_dom;
2480 u64 dma_mask;
2481
2482 domain = get_domain(dev);
2483 if (PTR_ERR(domain) == -EINVAL)
2484 return (dma_addr_t)paddr;
2485 else if (IS_ERR(domain))
2486 return DMA_ERROR_CODE;
2487
2488 dma_mask = *dev->dma_mask;
2489 dma_dom = to_dma_ops_domain(domain);
2490
2491 return __map_single(dev, dma_dom, paddr, size, dir, dma_mask);
2492 }
2493
2494 /*
2495 * The exported unmap_single function for dma_ops.
2496 */
2497 static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
2498 enum dma_data_direction dir, unsigned long attrs)
2499 {
2500 struct protection_domain *domain;
2501 struct dma_ops_domain *dma_dom;
2502
2503 domain = get_domain(dev);
2504 if (IS_ERR(domain))
2505 return;
2506
2507 dma_dom = to_dma_ops_domain(domain);
2508
2509 __unmap_single(dma_dom, dma_addr, size, dir);
2510 }
2511
2512 static int sg_num_pages(struct device *dev,
2513 struct scatterlist *sglist,
2514 int nelems)
2515 {
2516 unsigned long mask, boundary_size;
2517 struct scatterlist *s;
2518 int i, npages = 0;
2519
2520 mask = dma_get_seg_boundary(dev);
2521 boundary_size = mask + 1 ? ALIGN(mask + 1, PAGE_SIZE) >> PAGE_SHIFT :
2522 1UL << (BITS_PER_LONG - PAGE_SHIFT);
2523
2524 for_each_sg(sglist, s, nelems, i) {
2525 int p, n;
2526
2527 s->dma_address = npages << PAGE_SHIFT;
2528 p = npages % boundary_size;
2529 n = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE);
2530 if (p + n > boundary_size)
2531 npages += boundary_size - p;
2532 npages += n;
2533 }
2534
2535 return npages;
2536 }
2537
2538 /*
2539 * The exported map_sg function for dma_ops (handles scatter-gather
2540 * lists).
2541 */
2542 static int map_sg(struct device *dev, struct scatterlist *sglist,
2543 int nelems, enum dma_data_direction direction,
2544 unsigned long attrs)
2545 {
2546 int mapped_pages = 0, npages = 0, prot = 0, i;
2547 struct protection_domain *domain;
2548 struct dma_ops_domain *dma_dom;
2549 struct scatterlist *s;
2550 unsigned long address;
2551 u64 dma_mask;
2552
2553 domain = get_domain(dev);
2554 if (IS_ERR(domain))
2555 return 0;
2556
2557 dma_dom = to_dma_ops_domain(domain);
2558 dma_mask = *dev->dma_mask;
2559
2560 npages = sg_num_pages(dev, sglist, nelems);
2561
2562 address = dma_ops_alloc_iova(dev, dma_dom, npages, dma_mask);
2563 if (address == DMA_ERROR_CODE)
2564 goto out_err;
2565
2566 prot = dir2prot(direction);
2567
2568 /* Map all sg entries */
2569 for_each_sg(sglist, s, nelems, i) {
2570 int j, pages = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE);
2571
2572 for (j = 0; j < pages; ++j) {
2573 unsigned long bus_addr, phys_addr;
2574 int ret;
2575
2576 bus_addr = address + s->dma_address + (j << PAGE_SHIFT);
2577 phys_addr = (sg_phys(s) & PAGE_MASK) + (j << PAGE_SHIFT);
2578 ret = iommu_map_page(domain, bus_addr, phys_addr, PAGE_SIZE, prot, GFP_ATOMIC);
2579 if (ret)
2580 goto out_unmap;
2581
2582 mapped_pages += 1;
2583 }
2584 }
2585
2586 /* Everything is mapped - write the right values into s->dma_address */
2587 for_each_sg(sglist, s, nelems, i) {
2588 s->dma_address += address + s->offset;
2589 s->dma_length = s->length;
2590 }
2591
2592 return nelems;
2593
2594 out_unmap:
2595 pr_err("%s: IOMMU mapping error in map_sg (io-pages: %d)\n",
2596 dev_name(dev), npages);
2597
2598 for_each_sg(sglist, s, nelems, i) {
2599 int j, pages = iommu_num_pages(sg_phys(s), s->length, PAGE_SIZE);
2600
2601 for (j = 0; j < pages; ++j) {
2602 unsigned long bus_addr;
2603
2604 bus_addr = address + s->dma_address + (j << PAGE_SHIFT);
2605 iommu_unmap_page(domain, bus_addr, PAGE_SIZE);
2606
2607 if (--mapped_pages)
2608 goto out_free_iova;
2609 }
2610 }
2611
2612 out_free_iova:
2613 free_iova_fast(&dma_dom->iovad, address, npages);
2614
2615 out_err:
2616 return 0;
2617 }
2618
2619 /*
2620 * The exported map_sg function for dma_ops (handles scatter-gather
2621 * lists).
2622 */
2623 static void unmap_sg(struct device *dev, struct scatterlist *sglist,
2624 int nelems, enum dma_data_direction dir,
2625 unsigned long attrs)
2626 {
2627 struct protection_domain *domain;
2628 struct dma_ops_domain *dma_dom;
2629 unsigned long startaddr;
2630 int npages = 2;
2631
2632 domain = get_domain(dev);
2633 if (IS_ERR(domain))
2634 return;
2635
2636 startaddr = sg_dma_address(sglist) & PAGE_MASK;
2637 dma_dom = to_dma_ops_domain(domain);
2638 npages = sg_num_pages(dev, sglist, nelems);
2639
2640 __unmap_single(dma_dom, startaddr, npages << PAGE_SHIFT, dir);
2641 }
2642
2643 /*
2644 * The exported alloc_coherent function for dma_ops.
2645 */
2646 static void *alloc_coherent(struct device *dev, size_t size,
2647 dma_addr_t *dma_addr, gfp_t flag,
2648 unsigned long attrs)
2649 {
2650 u64 dma_mask = dev->coherent_dma_mask;
2651 struct protection_domain *domain;
2652 struct dma_ops_domain *dma_dom;
2653 struct page *page;
2654
2655 domain = get_domain(dev);
2656 if (PTR_ERR(domain) == -EINVAL) {
2657 page = alloc_pages(flag, get_order(size));
2658 *dma_addr = page_to_phys(page);
2659 return page_address(page);
2660 } else if (IS_ERR(domain))
2661 return NULL;
2662
2663 dma_dom = to_dma_ops_domain(domain);
2664 size = PAGE_ALIGN(size);
2665 dma_mask = dev->coherent_dma_mask;
2666 flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
2667 flag |= __GFP_ZERO;
2668
2669 page = alloc_pages(flag | __GFP_NOWARN, get_order(size));
2670 if (!page) {
2671 if (!gfpflags_allow_blocking(flag))
2672 return NULL;
2673
2674 page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
2675 get_order(size));
2676 if (!page)
2677 return NULL;
2678 }
2679
2680 if (!dma_mask)
2681 dma_mask = *dev->dma_mask;
2682
2683 *dma_addr = __map_single(dev, dma_dom, page_to_phys(page),
2684 size, DMA_BIDIRECTIONAL, dma_mask);
2685
2686 if (*dma_addr == DMA_ERROR_CODE)
2687 goto out_free;
2688
2689 return page_address(page);
2690
2691 out_free:
2692
2693 if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
2694 __free_pages(page, get_order(size));
2695
2696 return NULL;
2697 }
2698
2699 /*
2700 * The exported free_coherent function for dma_ops.
2701 */
2702 static void free_coherent(struct device *dev, size_t size,
2703 void *virt_addr, dma_addr_t dma_addr,
2704 unsigned long attrs)
2705 {
2706 struct protection_domain *domain;
2707 struct dma_ops_domain *dma_dom;
2708 struct page *page;
2709
2710 page = virt_to_page(virt_addr);
2711 size = PAGE_ALIGN(size);
2712
2713 domain = get_domain(dev);
2714 if (IS_ERR(domain))
2715 goto free_mem;
2716
2717 dma_dom = to_dma_ops_domain(domain);
2718
2719 __unmap_single(dma_dom, dma_addr, size, DMA_BIDIRECTIONAL);
2720
2721 free_mem:
2722 if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
2723 __free_pages(page, get_order(size));
2724 }
2725
2726 /*
2727 * This function is called by the DMA layer to find out if we can handle a
2728 * particular device. It is part of the dma_ops.
2729 */
2730 static int amd_iommu_dma_supported(struct device *dev, u64 mask)
2731 {
2732 return check_device(dev);
2733 }
2734
2735 static struct dma_map_ops amd_iommu_dma_ops = {
2736 .alloc = alloc_coherent,
2737 .free = free_coherent,
2738 .map_page = map_page,
2739 .unmap_page = unmap_page,
2740 .map_sg = map_sg,
2741 .unmap_sg = unmap_sg,
2742 .dma_supported = amd_iommu_dma_supported,
2743 };
2744
2745 static int init_reserved_iova_ranges(void)
2746 {
2747 struct pci_dev *pdev = NULL;
2748 struct iova *val;
2749
2750 init_iova_domain(&reserved_iova_ranges, PAGE_SIZE,
2751 IOVA_START_PFN, DMA_32BIT_PFN);
2752
2753 lockdep_set_class(&reserved_iova_ranges.iova_rbtree_lock,
2754 &reserved_rbtree_key);
2755
2756 /* MSI memory range */
2757 val = reserve_iova(&reserved_iova_ranges,
2758 IOVA_PFN(MSI_RANGE_START), IOVA_PFN(MSI_RANGE_END));
2759 if (!val) {
2760 pr_err("Reserving MSI range failed\n");
2761 return -ENOMEM;
2762 }
2763
2764 /* HT memory range */
2765 val = reserve_iova(&reserved_iova_ranges,
2766 IOVA_PFN(HT_RANGE_START), IOVA_PFN(HT_RANGE_END));
2767 if (!val) {
2768 pr_err("Reserving HT range failed\n");
2769 return -ENOMEM;
2770 }
2771
2772 /*
2773 * Memory used for PCI resources
2774 * FIXME: Check whether we can reserve the PCI-hole completly
2775 */
2776 for_each_pci_dev(pdev) {
2777 int i;
2778
2779 for (i = 0; i < PCI_NUM_RESOURCES; ++i) {
2780 struct resource *r = &pdev->resource[i];
2781
2782 if (!(r->flags & IORESOURCE_MEM))
2783 continue;
2784
2785 val = reserve_iova(&reserved_iova_ranges,
2786 IOVA_PFN(r->start),
2787 IOVA_PFN(r->end));
2788 if (!val) {
2789 pr_err("Reserve pci-resource range failed\n");
2790 return -ENOMEM;
2791 }
2792 }
2793 }
2794
2795 return 0;
2796 }
2797
2798 int __init amd_iommu_init_api(void)
2799 {
2800 int ret, cpu, err = 0;
2801
2802 ret = iova_cache_get();
2803 if (ret)
2804 return ret;
2805
2806 ret = init_reserved_iova_ranges();
2807 if (ret)
2808 return ret;
2809
2810 for_each_possible_cpu(cpu) {
2811 struct flush_queue *queue = per_cpu_ptr(&flush_queue, cpu);
2812
2813 queue->entries = kzalloc(FLUSH_QUEUE_SIZE *
2814 sizeof(*queue->entries),
2815 GFP_KERNEL);
2816 if (!queue->entries)
2817 goto out_put_iova;
2818
2819 spin_lock_init(&queue->lock);
2820 }
2821
2822 err = bus_set_iommu(&pci_bus_type, &amd_iommu_ops);
2823 if (err)
2824 return err;
2825 #ifdef CONFIG_ARM_AMBA
2826 err = bus_set_iommu(&amba_bustype, &amd_iommu_ops);
2827 if (err)
2828 return err;
2829 #endif
2830 err = bus_set_iommu(&platform_bus_type, &amd_iommu_ops);
2831 if (err)
2832 return err;
2833 return 0;
2834
2835 out_put_iova:
2836 for_each_possible_cpu(cpu) {
2837 struct flush_queue *queue = per_cpu_ptr(&flush_queue, cpu);
2838
2839 kfree(queue->entries);
2840 }
2841
2842 return -ENOMEM;
2843 }
2844
2845 int __init amd_iommu_init_dma_ops(void)
2846 {
2847 setup_timer(&queue_timer, queue_flush_timeout, 0);
2848 atomic_set(&queue_timer_on, 0);
2849
2850 swiotlb = iommu_pass_through ? 1 : 0;
2851 iommu_detected = 1;
2852
2853 /*
2854 * In case we don't initialize SWIOTLB (actually the common case
2855 * when AMD IOMMU is enabled), make sure there are global
2856 * dma_ops set as a fall-back for devices not handled by this
2857 * driver (for example non-PCI devices).
2858 */
2859 if (!swiotlb)
2860 dma_ops = &nommu_dma_ops;
2861
2862 if (amd_iommu_unmap_flush)
2863 pr_info("AMD-Vi: IO/TLB flush on unmap enabled\n");
2864 else
2865 pr_info("AMD-Vi: Lazy IO/TLB flushing enabled\n");
2866
2867 return 0;
2868
2869 }
2870
2871 /*****************************************************************************
2872 *
2873 * The following functions belong to the exported interface of AMD IOMMU
2874 *
2875 * This interface allows access to lower level functions of the IOMMU
2876 * like protection domain handling and assignement of devices to domains
2877 * which is not possible with the dma_ops interface.
2878 *
2879 *****************************************************************************/
2880
2881 static void cleanup_domain(struct protection_domain *domain)
2882 {
2883 struct iommu_dev_data *entry;
2884 unsigned long flags;
2885
2886 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
2887
2888 while (!list_empty(&domain->dev_list)) {
2889 entry = list_first_entry(&domain->dev_list,
2890 struct iommu_dev_data, list);
2891 __detach_device(entry);
2892 }
2893
2894 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
2895 }
2896
2897 static void protection_domain_free(struct protection_domain *domain)
2898 {
2899 if (!domain)
2900 return;
2901
2902 del_domain_from_list(domain);
2903
2904 if (domain->id)
2905 domain_id_free(domain->id);
2906
2907 kfree(domain);
2908 }
2909
2910 static int protection_domain_init(struct protection_domain *domain)
2911 {
2912 spin_lock_init(&domain->lock);
2913 mutex_init(&domain->api_lock);
2914 domain->id = domain_id_alloc();
2915 if (!domain->id)
2916 return -ENOMEM;
2917 INIT_LIST_HEAD(&domain->dev_list);
2918
2919 return 0;
2920 }
2921
2922 static struct protection_domain *protection_domain_alloc(void)
2923 {
2924 struct protection_domain *domain;
2925
2926 domain = kzalloc(sizeof(*domain), GFP_KERNEL);
2927 if (!domain)
2928 return NULL;
2929
2930 if (protection_domain_init(domain))
2931 goto out_err;
2932
2933 add_domain_to_list(domain);
2934
2935 return domain;
2936
2937 out_err:
2938 kfree(domain);
2939
2940 return NULL;
2941 }
2942
2943 static struct iommu_domain *amd_iommu_domain_alloc(unsigned type)
2944 {
2945 struct protection_domain *pdomain;
2946 struct dma_ops_domain *dma_domain;
2947
2948 switch (type) {
2949 case IOMMU_DOMAIN_UNMANAGED:
2950 pdomain = protection_domain_alloc();
2951 if (!pdomain)
2952 return NULL;
2953
2954 pdomain->mode = PAGE_MODE_3_LEVEL;
2955 pdomain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
2956 if (!pdomain->pt_root) {
2957 protection_domain_free(pdomain);
2958 return NULL;
2959 }
2960
2961 pdomain->domain.geometry.aperture_start = 0;
2962 pdomain->domain.geometry.aperture_end = ~0ULL;
2963 pdomain->domain.geometry.force_aperture = true;
2964
2965 break;
2966 case IOMMU_DOMAIN_DMA:
2967 dma_domain = dma_ops_domain_alloc();
2968 if (!dma_domain) {
2969 pr_err("AMD-Vi: Failed to allocate\n");
2970 return NULL;
2971 }
2972 pdomain = &dma_domain->domain;
2973 break;
2974 case IOMMU_DOMAIN_IDENTITY:
2975 pdomain = protection_domain_alloc();
2976 if (!pdomain)
2977 return NULL;
2978
2979 pdomain->mode = PAGE_MODE_NONE;
2980 break;
2981 default:
2982 return NULL;
2983 }
2984
2985 return &pdomain->domain;
2986 }
2987
2988 static void amd_iommu_domain_free(struct iommu_domain *dom)
2989 {
2990 struct protection_domain *domain;
2991 struct dma_ops_domain *dma_dom;
2992
2993 domain = to_pdomain(dom);
2994
2995 if (domain->dev_cnt > 0)
2996 cleanup_domain(domain);
2997
2998 BUG_ON(domain->dev_cnt != 0);
2999
3000 if (!dom)
3001 return;
3002
3003 switch (dom->type) {
3004 case IOMMU_DOMAIN_DMA:
3005 /*
3006 * First make sure the domain is no longer referenced from the
3007 * flush queue
3008 */
3009 queue_flush_all();
3010
3011 /* Now release the domain */
3012 dma_dom = to_dma_ops_domain(domain);
3013 dma_ops_domain_free(dma_dom);
3014 break;
3015 default:
3016 if (domain->mode != PAGE_MODE_NONE)
3017 free_pagetable(domain);
3018
3019 if (domain->flags & PD_IOMMUV2_MASK)
3020 free_gcr3_table(domain);
3021
3022 protection_domain_free(domain);
3023 break;
3024 }
3025 }
3026
3027 static void amd_iommu_detach_device(struct iommu_domain *dom,
3028 struct device *dev)
3029 {
3030 struct iommu_dev_data *dev_data = dev->archdata.iommu;
3031 struct amd_iommu *iommu;
3032 int devid;
3033
3034 if (!check_device(dev))
3035 return;
3036
3037 devid = get_device_id(dev);
3038 if (devid < 0)
3039 return;
3040
3041 if (dev_data->domain != NULL)
3042 detach_device(dev);
3043
3044 iommu = amd_iommu_rlookup_table[devid];
3045 if (!iommu)
3046 return;
3047
3048 #ifdef CONFIG_IRQ_REMAP
3049 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) &&
3050 (dom->type == IOMMU_DOMAIN_UNMANAGED))
3051 dev_data->use_vapic = 0;
3052 #endif
3053
3054 iommu_completion_wait(iommu);
3055 }
3056
3057 static int amd_iommu_attach_device(struct iommu_domain *dom,
3058 struct device *dev)
3059 {
3060 struct protection_domain *domain = to_pdomain(dom);
3061 struct iommu_dev_data *dev_data;
3062 struct amd_iommu *iommu;
3063 int ret;
3064
3065 if (!check_device(dev))
3066 return -EINVAL;
3067
3068 dev_data = dev->archdata.iommu;
3069
3070 iommu = amd_iommu_rlookup_table[dev_data->devid];
3071 if (!iommu)
3072 return -EINVAL;
3073
3074 if (dev_data->domain)
3075 detach_device(dev);
3076
3077 ret = attach_device(dev, domain);
3078
3079 #ifdef CONFIG_IRQ_REMAP
3080 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
3081 if (dom->type == IOMMU_DOMAIN_UNMANAGED)
3082 dev_data->use_vapic = 1;
3083 else
3084 dev_data->use_vapic = 0;
3085 }
3086 #endif
3087
3088 iommu_completion_wait(iommu);
3089
3090 return ret;
3091 }
3092
3093 static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
3094 phys_addr_t paddr, size_t page_size, int iommu_prot)
3095 {
3096 struct protection_domain *domain = to_pdomain(dom);
3097 int prot = 0;
3098 int ret;
3099
3100 if (domain->mode == PAGE_MODE_NONE)
3101 return -EINVAL;
3102
3103 if (iommu_prot & IOMMU_READ)
3104 prot |= IOMMU_PROT_IR;
3105 if (iommu_prot & IOMMU_WRITE)
3106 prot |= IOMMU_PROT_IW;
3107
3108 mutex_lock(&domain->api_lock);
3109 ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL);
3110 mutex_unlock(&domain->api_lock);
3111
3112 return ret;
3113 }
3114
3115 static size_t amd_iommu_unmap(struct iommu_domain *dom, unsigned long iova,
3116 size_t page_size)
3117 {
3118 struct protection_domain *domain = to_pdomain(dom);
3119 size_t unmap_size;
3120
3121 if (domain->mode == PAGE_MODE_NONE)
3122 return -EINVAL;
3123
3124 mutex_lock(&domain->api_lock);
3125 unmap_size = iommu_unmap_page(domain, iova, page_size);
3126 mutex_unlock(&domain->api_lock);
3127
3128 domain_flush_tlb_pde(domain);
3129
3130 return unmap_size;
3131 }
3132
3133 static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
3134 dma_addr_t iova)
3135 {
3136 struct protection_domain *domain = to_pdomain(dom);
3137 unsigned long offset_mask, pte_pgsize;
3138 u64 *pte, __pte;
3139
3140 if (domain->mode == PAGE_MODE_NONE)
3141 return iova;
3142
3143 pte = fetch_pte(domain, iova, &pte_pgsize);
3144
3145 if (!pte || !IOMMU_PTE_PRESENT(*pte))
3146 return 0;
3147
3148 offset_mask = pte_pgsize - 1;
3149 __pte = *pte & PM_ADDR_MASK;
3150
3151 return (__pte & ~offset_mask) | (iova & offset_mask);
3152 }
3153
3154 static bool amd_iommu_capable(enum iommu_cap cap)
3155 {
3156 switch (cap) {
3157 case IOMMU_CAP_CACHE_COHERENCY:
3158 return true;
3159 case IOMMU_CAP_INTR_REMAP:
3160 return (irq_remapping_enabled == 1);
3161 case IOMMU_CAP_NOEXEC:
3162 return false;
3163 }
3164
3165 return false;
3166 }
3167
3168 static void amd_iommu_get_dm_regions(struct device *dev,
3169 struct list_head *head)
3170 {
3171 struct unity_map_entry *entry;
3172 int devid;
3173
3174 devid = get_device_id(dev);
3175 if (devid < 0)
3176 return;
3177
3178 list_for_each_entry(entry, &amd_iommu_unity_map, list) {
3179 struct iommu_dm_region *region;
3180
3181 if (devid < entry->devid_start || devid > entry->devid_end)
3182 continue;
3183
3184 region = kzalloc(sizeof(*region), GFP_KERNEL);
3185 if (!region) {
3186 pr_err("Out of memory allocating dm-regions for %s\n",
3187 dev_name(dev));
3188 return;
3189 }
3190
3191 region->start = entry->address_start;
3192 region->length = entry->address_end - entry->address_start;
3193 if (entry->prot & IOMMU_PROT_IR)
3194 region->prot |= IOMMU_READ;
3195 if (entry->prot & IOMMU_PROT_IW)
3196 region->prot |= IOMMU_WRITE;
3197
3198 list_add_tail(&region->list, head);
3199 }
3200 }
3201
3202 static void amd_iommu_put_dm_regions(struct device *dev,
3203 struct list_head *head)
3204 {
3205 struct iommu_dm_region *entry, *next;
3206
3207 list_for_each_entry_safe(entry, next, head, list)
3208 kfree(entry);
3209 }
3210
3211 static void amd_iommu_apply_dm_region(struct device *dev,
3212 struct iommu_domain *domain,
3213 struct iommu_dm_region *region)
3214 {
3215 struct dma_ops_domain *dma_dom = to_dma_ops_domain(to_pdomain(domain));
3216 unsigned long start, end;
3217
3218 start = IOVA_PFN(region->start);
3219 end = IOVA_PFN(region->start + region->length);
3220
3221 WARN_ON_ONCE(reserve_iova(&dma_dom->iovad, start, end) == NULL);
3222 }
3223
3224 const struct iommu_ops amd_iommu_ops = {
3225 .capable = amd_iommu_capable,
3226 .domain_alloc = amd_iommu_domain_alloc,
3227 .domain_free = amd_iommu_domain_free,
3228 .attach_dev = amd_iommu_attach_device,
3229 .detach_dev = amd_iommu_detach_device,
3230 .map = amd_iommu_map,
3231 .unmap = amd_iommu_unmap,
3232 .map_sg = default_iommu_map_sg,
3233 .iova_to_phys = amd_iommu_iova_to_phys,
3234 .add_device = amd_iommu_add_device,
3235 .remove_device = amd_iommu_remove_device,
3236 .device_group = amd_iommu_device_group,
3237 .get_dm_regions = amd_iommu_get_dm_regions,
3238 .put_dm_regions = amd_iommu_put_dm_regions,
3239 .apply_dm_region = amd_iommu_apply_dm_region,
3240 .pgsize_bitmap = AMD_IOMMU_PGSIZES,
3241 };
3242
3243 /*****************************************************************************
3244 *
3245 * The next functions do a basic initialization of IOMMU for pass through
3246 * mode
3247 *
3248 * In passthrough mode the IOMMU is initialized and enabled but not used for
3249 * DMA-API translation.
3250 *
3251 *****************************************************************************/
3252
3253 /* IOMMUv2 specific functions */
3254 int amd_iommu_register_ppr_notifier(struct notifier_block *nb)
3255 {
3256 return atomic_notifier_chain_register(&ppr_notifier, nb);
3257 }
3258 EXPORT_SYMBOL(amd_iommu_register_ppr_notifier);
3259
3260 int amd_iommu_unregister_ppr_notifier(struct notifier_block *nb)
3261 {
3262 return atomic_notifier_chain_unregister(&ppr_notifier, nb);
3263 }
3264 EXPORT_SYMBOL(amd_iommu_unregister_ppr_notifier);
3265
3266 void amd_iommu_domain_direct_map(struct iommu_domain *dom)
3267 {
3268 struct protection_domain *domain = to_pdomain(dom);
3269 unsigned long flags;
3270
3271 spin_lock_irqsave(&domain->lock, flags);
3272
3273 /* Update data structure */
3274 domain->mode = PAGE_MODE_NONE;
3275 domain->updated = true;
3276
3277 /* Make changes visible to IOMMUs */
3278 update_domain(domain);
3279
3280 /* Page-table is not visible to IOMMU anymore, so free it */
3281 free_pagetable(domain);
3282
3283 spin_unlock_irqrestore(&domain->lock, flags);
3284 }
3285 EXPORT_SYMBOL(amd_iommu_domain_direct_map);
3286
3287 int amd_iommu_domain_enable_v2(struct iommu_domain *dom, int pasids)
3288 {
3289 struct protection_domain *domain = to_pdomain(dom);
3290 unsigned long flags;
3291 int levels, ret;
3292
3293 if (pasids <= 0 || pasids > (PASID_MASK + 1))
3294 return -EINVAL;
3295
3296 /* Number of GCR3 table levels required */
3297 for (levels = 0; (pasids - 1) & ~0x1ff; pasids >>= 9)
3298 levels += 1;
3299
3300 if (levels > amd_iommu_max_glx_val)
3301 return -EINVAL;
3302
3303 spin_lock_irqsave(&domain->lock, flags);
3304
3305 /*
3306 * Save us all sanity checks whether devices already in the
3307 * domain support IOMMUv2. Just force that the domain has no
3308 * devices attached when it is switched into IOMMUv2 mode.
3309 */
3310 ret = -EBUSY;
3311 if (domain->dev_cnt > 0 || domain->flags & PD_IOMMUV2_MASK)
3312 goto out;
3313
3314 ret = -ENOMEM;
3315 domain->gcr3_tbl = (void *)get_zeroed_page(GFP_ATOMIC);
3316 if (domain->gcr3_tbl == NULL)
3317 goto out;
3318
3319 domain->glx = levels;
3320 domain->flags |= PD_IOMMUV2_MASK;
3321 domain->updated = true;
3322
3323 update_domain(domain);
3324
3325 ret = 0;
3326
3327 out:
3328 spin_unlock_irqrestore(&domain->lock, flags);
3329
3330 return ret;
3331 }
3332 EXPORT_SYMBOL(amd_iommu_domain_enable_v2);
3333
3334 static int __flush_pasid(struct protection_domain *domain, int pasid,
3335 u64 address, bool size)
3336 {
3337 struct iommu_dev_data *dev_data;
3338 struct iommu_cmd cmd;
3339 int i, ret;
3340
3341 if (!(domain->flags & PD_IOMMUV2_MASK))
3342 return -EINVAL;
3343
3344 build_inv_iommu_pasid(&cmd, domain->id, pasid, address, size);
3345
3346 /*
3347 * IOMMU TLB needs to be flushed before Device TLB to
3348 * prevent device TLB refill from IOMMU TLB
3349 */
3350 for (i = 0; i < amd_iommus_present; ++i) {
3351 if (domain->dev_iommu[i] == 0)
3352 continue;
3353
3354 ret = iommu_queue_command(amd_iommus[i], &cmd);
3355 if (ret != 0)
3356 goto out;
3357 }
3358
3359 /* Wait until IOMMU TLB flushes are complete */
3360 domain_flush_complete(domain);
3361
3362 /* Now flush device TLBs */
3363 list_for_each_entry(dev_data, &domain->dev_list, list) {
3364 struct amd_iommu *iommu;
3365 int qdep;
3366
3367 /*
3368 There might be non-IOMMUv2 capable devices in an IOMMUv2
3369 * domain.
3370 */
3371 if (!dev_data->ats.enabled)
3372 continue;
3373
3374 qdep = dev_data->ats.qdep;
3375 iommu = amd_iommu_rlookup_table[dev_data->devid];
3376
3377 build_inv_iotlb_pasid(&cmd, dev_data->devid, pasid,
3378 qdep, address, size);
3379
3380 ret = iommu_queue_command(iommu, &cmd);
3381 if (ret != 0)
3382 goto out;
3383 }
3384
3385 /* Wait until all device TLBs are flushed */
3386 domain_flush_complete(domain);
3387
3388 ret = 0;
3389
3390 out:
3391
3392 return ret;
3393 }
3394
3395 static int __amd_iommu_flush_page(struct protection_domain *domain, int pasid,
3396 u64 address)
3397 {
3398 return __flush_pasid(domain, pasid, address, false);
3399 }
3400
3401 int amd_iommu_flush_page(struct iommu_domain *dom, int pasid,
3402 u64 address)
3403 {
3404 struct protection_domain *domain = to_pdomain(dom);
3405 unsigned long flags;
3406 int ret;
3407
3408 spin_lock_irqsave(&domain->lock, flags);
3409 ret = __amd_iommu_flush_page(domain, pasid, address);
3410 spin_unlock_irqrestore(&domain->lock, flags);
3411
3412 return ret;
3413 }
3414 EXPORT_SYMBOL(amd_iommu_flush_page);
3415
3416 static int __amd_iommu_flush_tlb(struct protection_domain *domain, int pasid)
3417 {
3418 return __flush_pasid(domain, pasid, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
3419 true);
3420 }
3421
3422 int amd_iommu_flush_tlb(struct iommu_domain *dom, int pasid)
3423 {
3424 struct protection_domain *domain = to_pdomain(dom);
3425 unsigned long flags;
3426 int ret;
3427
3428 spin_lock_irqsave(&domain->lock, flags);
3429 ret = __amd_iommu_flush_tlb(domain, pasid);
3430 spin_unlock_irqrestore(&domain->lock, flags);
3431
3432 return ret;
3433 }
3434 EXPORT_SYMBOL(amd_iommu_flush_tlb);
3435
3436 static u64 *__get_gcr3_pte(u64 *root, int level, int pasid, bool alloc)
3437 {
3438 int index;
3439 u64 *pte;
3440
3441 while (true) {
3442
3443 index = (pasid >> (9 * level)) & 0x1ff;
3444 pte = &root[index];
3445
3446 if (level == 0)
3447 break;
3448
3449 if (!(*pte & GCR3_VALID)) {
3450 if (!alloc)
3451 return NULL;
3452
3453 root = (void *)get_zeroed_page(GFP_ATOMIC);
3454 if (root == NULL)
3455 return NULL;
3456
3457 *pte = __pa(root) | GCR3_VALID;
3458 }
3459
3460 root = __va(*pte & PAGE_MASK);
3461
3462 level -= 1;
3463 }
3464
3465 return pte;
3466 }
3467
3468 static int __set_gcr3(struct protection_domain *domain, int pasid,
3469 unsigned long cr3)
3470 {
3471 u64 *pte;
3472
3473 if (domain->mode != PAGE_MODE_NONE)
3474 return -EINVAL;
3475
3476 pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, true);
3477 if (pte == NULL)
3478 return -ENOMEM;
3479
3480 *pte = (cr3 & PAGE_MASK) | GCR3_VALID;
3481
3482 return __amd_iommu_flush_tlb(domain, pasid);
3483 }
3484
3485 static int __clear_gcr3(struct protection_domain *domain, int pasid)
3486 {
3487 u64 *pte;
3488
3489 if (domain->mode != PAGE_MODE_NONE)
3490 return -EINVAL;
3491
3492 pte = __get_gcr3_pte(domain->gcr3_tbl, domain->glx, pasid, false);
3493 if (pte == NULL)
3494 return 0;
3495
3496 *pte = 0;
3497
3498 return __amd_iommu_flush_tlb(domain, pasid);
3499 }
3500
3501 int amd_iommu_domain_set_gcr3(struct iommu_domain *dom, int pasid,
3502 unsigned long cr3)
3503 {
3504 struct protection_domain *domain = to_pdomain(dom);
3505 unsigned long flags;
3506 int ret;
3507
3508 spin_lock_irqsave(&domain->lock, flags);
3509 ret = __set_gcr3(domain, pasid, cr3);
3510 spin_unlock_irqrestore(&domain->lock, flags);
3511
3512 return ret;
3513 }
3514 EXPORT_SYMBOL(amd_iommu_domain_set_gcr3);
3515
3516 int amd_iommu_domain_clear_gcr3(struct iommu_domain *dom, int pasid)
3517 {
3518 struct protection_domain *domain = to_pdomain(dom);
3519 unsigned long flags;
3520 int ret;
3521
3522 spin_lock_irqsave(&domain->lock, flags);
3523 ret = __clear_gcr3(domain, pasid);
3524 spin_unlock_irqrestore(&domain->lock, flags);
3525
3526 return ret;
3527 }
3528 EXPORT_SYMBOL(amd_iommu_domain_clear_gcr3);
3529
3530 int amd_iommu_complete_ppr(struct pci_dev *pdev, int pasid,
3531 int status, int tag)
3532 {
3533 struct iommu_dev_data *dev_data;
3534 struct amd_iommu *iommu;
3535 struct iommu_cmd cmd;
3536
3537 dev_data = get_dev_data(&pdev->dev);
3538 iommu = amd_iommu_rlookup_table[dev_data->devid];
3539
3540 build_complete_ppr(&cmd, dev_data->devid, pasid, status,
3541 tag, dev_data->pri_tlp);
3542
3543 return iommu_queue_command(iommu, &cmd);
3544 }
3545 EXPORT_SYMBOL(amd_iommu_complete_ppr);
3546
3547 struct iommu_domain *amd_iommu_get_v2_domain(struct pci_dev *pdev)
3548 {
3549 struct protection_domain *pdomain;
3550
3551 pdomain = get_domain(&pdev->dev);
3552 if (IS_ERR(pdomain))
3553 return NULL;
3554
3555 /* Only return IOMMUv2 domains */
3556 if (!(pdomain->flags & PD_IOMMUV2_MASK))
3557 return NULL;
3558
3559 return &pdomain->domain;
3560 }
3561 EXPORT_SYMBOL(amd_iommu_get_v2_domain);
3562
3563 void amd_iommu_enable_device_erratum(struct pci_dev *pdev, u32 erratum)
3564 {
3565 struct iommu_dev_data *dev_data;
3566
3567 if (!amd_iommu_v2_supported())
3568 return;
3569
3570 dev_data = get_dev_data(&pdev->dev);
3571 dev_data->errata |= (1 << erratum);
3572 }
3573 EXPORT_SYMBOL(amd_iommu_enable_device_erratum);
3574
3575 int amd_iommu_device_info(struct pci_dev *pdev,
3576 struct amd_iommu_device_info *info)
3577 {
3578 int max_pasids;
3579 int pos;
3580
3581 if (pdev == NULL || info == NULL)
3582 return -EINVAL;
3583
3584 if (!amd_iommu_v2_supported())
3585 return -EINVAL;
3586
3587 memset(info, 0, sizeof(*info));
3588
3589 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ATS);
3590 if (pos)
3591 info->flags |= AMD_IOMMU_DEVICE_FLAG_ATS_SUP;
3592
3593 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI);
3594 if (pos)
3595 info->flags |= AMD_IOMMU_DEVICE_FLAG_PRI_SUP;
3596
3597 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID);
3598 if (pos) {
3599 int features;
3600
3601 max_pasids = 1 << (9 * (amd_iommu_max_glx_val + 1));
3602 max_pasids = min(max_pasids, (1 << 20));
3603
3604 info->flags |= AMD_IOMMU_DEVICE_FLAG_PASID_SUP;
3605 info->max_pasids = min(pci_max_pasids(pdev), max_pasids);
3606
3607 features = pci_pasid_features(pdev);
3608 if (features & PCI_PASID_CAP_EXEC)
3609 info->flags |= AMD_IOMMU_DEVICE_FLAG_EXEC_SUP;
3610 if (features & PCI_PASID_CAP_PRIV)
3611 info->flags |= AMD_IOMMU_DEVICE_FLAG_PRIV_SUP;
3612 }
3613
3614 return 0;
3615 }
3616 EXPORT_SYMBOL(amd_iommu_device_info);
3617
3618 #ifdef CONFIG_IRQ_REMAP
3619
3620 /*****************************************************************************
3621 *
3622 * Interrupt Remapping Implementation
3623 *
3624 *****************************************************************************/
3625
3626 static struct irq_chip amd_ir_chip;
3627
3628 #define DTE_IRQ_PHYS_ADDR_MASK (((1ULL << 45)-1) << 6)
3629 #define DTE_IRQ_REMAP_INTCTL (2ULL << 60)
3630 #define DTE_IRQ_TABLE_LEN (8ULL << 1)
3631 #define DTE_IRQ_REMAP_ENABLE 1ULL
3632
3633 static void set_dte_irq_entry(u16 devid, struct irq_remap_table *table)
3634 {
3635 u64 dte;
3636
3637 dte = amd_iommu_dev_table[devid].data[2];
3638 dte &= ~DTE_IRQ_PHYS_ADDR_MASK;
3639 dte |= virt_to_phys(table->table);
3640 dte |= DTE_IRQ_REMAP_INTCTL;
3641 dte |= DTE_IRQ_TABLE_LEN;
3642 dte |= DTE_IRQ_REMAP_ENABLE;
3643
3644 amd_iommu_dev_table[devid].data[2] = dte;
3645 }
3646
3647 static struct irq_remap_table *get_irq_table(u16 devid, bool ioapic)
3648 {
3649 struct irq_remap_table *table = NULL;
3650 struct amd_iommu *iommu;
3651 unsigned long flags;
3652 u16 alias;
3653
3654 write_lock_irqsave(&amd_iommu_devtable_lock, flags);
3655
3656 iommu = amd_iommu_rlookup_table[devid];
3657 if (!iommu)
3658 goto out_unlock;
3659
3660 table = irq_lookup_table[devid];
3661 if (table)
3662 goto out_unlock;
3663
3664 alias = amd_iommu_alias_table[devid];
3665 table = irq_lookup_table[alias];
3666 if (table) {
3667 irq_lookup_table[devid] = table;
3668 set_dte_irq_entry(devid, table);
3669 iommu_flush_dte(iommu, devid);
3670 goto out;
3671 }
3672
3673 /* Nothing there yet, allocate new irq remapping table */
3674 table = kzalloc(sizeof(*table), GFP_ATOMIC);
3675 if (!table)
3676 goto out_unlock;
3677
3678 /* Initialize table spin-lock */
3679 spin_lock_init(&table->lock);
3680
3681 if (ioapic)
3682 /* Keep the first 32 indexes free for IOAPIC interrupts */
3683 table->min_index = 32;
3684
3685 table->table = kmem_cache_alloc(amd_iommu_irq_cache, GFP_ATOMIC);
3686 if (!table->table) {
3687 kfree(table);
3688 table = NULL;
3689 goto out_unlock;
3690 }
3691
3692 if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
3693 memset(table->table, 0,
3694 MAX_IRQS_PER_TABLE * sizeof(u32));
3695 else
3696 memset(table->table, 0,
3697 (MAX_IRQS_PER_TABLE * (sizeof(u64) * 2)));
3698
3699 if (ioapic) {
3700 int i;
3701
3702 for (i = 0; i < 32; ++i)
3703 iommu->irte_ops->set_allocated(table, i);
3704 }
3705
3706 irq_lookup_table[devid] = table;
3707 set_dte_irq_entry(devid, table);
3708 iommu_flush_dte(iommu, devid);
3709 if (devid != alias) {
3710 irq_lookup_table[alias] = table;
3711 set_dte_irq_entry(alias, table);
3712 iommu_flush_dte(iommu, alias);
3713 }
3714
3715 out:
3716 iommu_completion_wait(iommu);
3717
3718 out_unlock:
3719 write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
3720
3721 return table;
3722 }
3723
3724 static int alloc_irq_index(u16 devid, int count)
3725 {
3726 struct irq_remap_table *table;
3727 unsigned long flags;
3728 int index, c;
3729 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
3730
3731 if (!iommu)
3732 return -ENODEV;
3733
3734 table = get_irq_table(devid, false);
3735 if (!table)
3736 return -ENODEV;
3737
3738 spin_lock_irqsave(&table->lock, flags);
3739
3740 /* Scan table for free entries */
3741 for (c = 0, index = table->min_index;
3742 index < MAX_IRQS_PER_TABLE;
3743 ++index) {
3744 if (!iommu->irte_ops->is_allocated(table, index))
3745 c += 1;
3746 else
3747 c = 0;
3748
3749 if (c == count) {
3750 for (; c != 0; --c)
3751 iommu->irte_ops->set_allocated(table, index - c + 1);
3752
3753 index -= count - 1;
3754 goto out;
3755 }
3756 }
3757
3758 index = -ENOSPC;
3759
3760 out:
3761 spin_unlock_irqrestore(&table->lock, flags);
3762
3763 return index;
3764 }
3765
3766 static int modify_irte_ga(u16 devid, int index, struct irte_ga *irte,
3767 struct amd_ir_data *data)
3768 {
3769 struct irq_remap_table *table;
3770 struct amd_iommu *iommu;
3771 unsigned long flags;
3772 struct irte_ga *entry;
3773
3774 iommu = amd_iommu_rlookup_table[devid];
3775 if (iommu == NULL)
3776 return -EINVAL;
3777
3778 table = get_irq_table(devid, false);
3779 if (!table)
3780 return -ENOMEM;
3781
3782 spin_lock_irqsave(&table->lock, flags);
3783
3784 entry = (struct irte_ga *)table->table;
3785 entry = &entry[index];
3786 entry->lo.fields_remap.valid = 0;
3787 entry->hi.val = irte->hi.val;
3788 entry->lo.val = irte->lo.val;
3789 entry->lo.fields_remap.valid = 1;
3790 if (data)
3791 data->ref = entry;
3792
3793 spin_unlock_irqrestore(&table->lock, flags);
3794
3795 iommu_flush_irt(iommu, devid);
3796 iommu_completion_wait(iommu);
3797
3798 return 0;
3799 }
3800
3801 static int modify_irte(u16 devid, int index, union irte *irte)
3802 {
3803 struct irq_remap_table *table;
3804 struct amd_iommu *iommu;
3805 unsigned long flags;
3806
3807 iommu = amd_iommu_rlookup_table[devid];
3808 if (iommu == NULL)
3809 return -EINVAL;
3810
3811 table = get_irq_table(devid, false);
3812 if (!table)
3813 return -ENOMEM;
3814
3815 spin_lock_irqsave(&table->lock, flags);
3816 table->table[index] = irte->val;
3817 spin_unlock_irqrestore(&table->lock, flags);
3818
3819 iommu_flush_irt(iommu, devid);
3820 iommu_completion_wait(iommu);
3821
3822 return 0;
3823 }
3824
3825 static void free_irte(u16 devid, int index)
3826 {
3827 struct irq_remap_table *table;
3828 struct amd_iommu *iommu;
3829 unsigned long flags;
3830
3831 iommu = amd_iommu_rlookup_table[devid];
3832 if (iommu == NULL)
3833 return;
3834
3835 table = get_irq_table(devid, false);
3836 if (!table)
3837 return;
3838
3839 spin_lock_irqsave(&table->lock, flags);
3840 iommu->irte_ops->clear_allocated(table, index);
3841 spin_unlock_irqrestore(&table->lock, flags);
3842
3843 iommu_flush_irt(iommu, devid);
3844 iommu_completion_wait(iommu);
3845 }
3846
3847 static void irte_prepare(void *entry,
3848 u32 delivery_mode, u32 dest_mode,
3849 u8 vector, u32 dest_apicid, int devid)
3850 {
3851 union irte *irte = (union irte *) entry;
3852
3853 irte->val = 0;
3854 irte->fields.vector = vector;
3855 irte->fields.int_type = delivery_mode;
3856 irte->fields.destination = dest_apicid;
3857 irte->fields.dm = dest_mode;
3858 irte->fields.valid = 1;
3859 }
3860
3861 static void irte_ga_prepare(void *entry,
3862 u32 delivery_mode, u32 dest_mode,
3863 u8 vector, u32 dest_apicid, int devid)
3864 {
3865 struct irte_ga *irte = (struct irte_ga *) entry;
3866 struct iommu_dev_data *dev_data = search_dev_data(devid);
3867
3868 irte->lo.val = 0;
3869 irte->hi.val = 0;
3870 irte->lo.fields_remap.guest_mode = dev_data ? dev_data->use_vapic : 0;
3871 irte->lo.fields_remap.int_type = delivery_mode;
3872 irte->lo.fields_remap.dm = dest_mode;
3873 irte->hi.fields.vector = vector;
3874 irte->lo.fields_remap.destination = dest_apicid;
3875 irte->lo.fields_remap.valid = 1;
3876 }
3877
3878 static void irte_activate(void *entry, u16 devid, u16 index)
3879 {
3880 union irte *irte = (union irte *) entry;
3881
3882 irte->fields.valid = 1;
3883 modify_irte(devid, index, irte);
3884 }
3885
3886 static void irte_ga_activate(void *entry, u16 devid, u16 index)
3887 {
3888 struct irte_ga *irte = (struct irte_ga *) entry;
3889
3890 irte->lo.fields_remap.valid = 1;
3891 modify_irte_ga(devid, index, irte, NULL);
3892 }
3893
3894 static void irte_deactivate(void *entry, u16 devid, u16 index)
3895 {
3896 union irte *irte = (union irte *) entry;
3897
3898 irte->fields.valid = 0;
3899 modify_irte(devid, index, irte);
3900 }
3901
3902 static void irte_ga_deactivate(void *entry, u16 devid, u16 index)
3903 {
3904 struct irte_ga *irte = (struct irte_ga *) entry;
3905
3906 irte->lo.fields_remap.valid = 0;
3907 modify_irte_ga(devid, index, irte, NULL);
3908 }
3909
3910 static void irte_set_affinity(void *entry, u16 devid, u16 index,
3911 u8 vector, u32 dest_apicid)
3912 {
3913 union irte *irte = (union irte *) entry;
3914
3915 irte->fields.vector = vector;
3916 irte->fields.destination = dest_apicid;
3917 modify_irte(devid, index, irte);
3918 }
3919
3920 static void irte_ga_set_affinity(void *entry, u16 devid, u16 index,
3921 u8 vector, u32 dest_apicid)
3922 {
3923 struct irte_ga *irte = (struct irte_ga *) entry;
3924 struct iommu_dev_data *dev_data = search_dev_data(devid);
3925
3926 if (!dev_data || !dev_data->use_vapic) {
3927 irte->hi.fields.vector = vector;
3928 irte->lo.fields_remap.destination = dest_apicid;
3929 irte->lo.fields_remap.guest_mode = 0;
3930 modify_irte_ga(devid, index, irte, NULL);
3931 }
3932 }
3933
3934 #define IRTE_ALLOCATED (~1U)
3935 static void irte_set_allocated(struct irq_remap_table *table, int index)
3936 {
3937 table->table[index] = IRTE_ALLOCATED;
3938 }
3939
3940 static void irte_ga_set_allocated(struct irq_remap_table *table, int index)
3941 {
3942 struct irte_ga *ptr = (struct irte_ga *)table->table;
3943 struct irte_ga *irte = &ptr[index];
3944
3945 memset(&irte->lo.val, 0, sizeof(u64));
3946 memset(&irte->hi.val, 0, sizeof(u64));
3947 irte->hi.fields.vector = 0xff;
3948 }
3949
3950 static bool irte_is_allocated(struct irq_remap_table *table, int index)
3951 {
3952 union irte *ptr = (union irte *)table->table;
3953 union irte *irte = &ptr[index];
3954
3955 return irte->val != 0;
3956 }
3957
3958 static bool irte_ga_is_allocated(struct irq_remap_table *table, int index)
3959 {
3960 struct irte_ga *ptr = (struct irte_ga *)table->table;
3961 struct irte_ga *irte = &ptr[index];
3962
3963 return irte->hi.fields.vector != 0;
3964 }
3965
3966 static void irte_clear_allocated(struct irq_remap_table *table, int index)
3967 {
3968 table->table[index] = 0;
3969 }
3970
3971 static void irte_ga_clear_allocated(struct irq_remap_table *table, int index)
3972 {
3973 struct irte_ga *ptr = (struct irte_ga *)table->table;
3974 struct irte_ga *irte = &ptr[index];
3975
3976 memset(&irte->lo.val, 0, sizeof(u64));
3977 memset(&irte->hi.val, 0, sizeof(u64));
3978 }
3979
3980 static int get_devid(struct irq_alloc_info *info)
3981 {
3982 int devid = -1;
3983
3984 switch (info->type) {
3985 case X86_IRQ_ALLOC_TYPE_IOAPIC:
3986 devid = get_ioapic_devid(info->ioapic_id);
3987 break;
3988 case X86_IRQ_ALLOC_TYPE_HPET:
3989 devid = get_hpet_devid(info->hpet_id);
3990 break;
3991 case X86_IRQ_ALLOC_TYPE_MSI:
3992 case X86_IRQ_ALLOC_TYPE_MSIX:
3993 devid = get_device_id(&info->msi_dev->dev);
3994 break;
3995 default:
3996 BUG_ON(1);
3997 break;
3998 }
3999
4000 return devid;
4001 }
4002
4003 static struct irq_domain *get_ir_irq_domain(struct irq_alloc_info *info)
4004 {
4005 struct amd_iommu *iommu;
4006 int devid;
4007
4008 if (!info)
4009 return NULL;
4010
4011 devid = get_devid(info);
4012 if (devid >= 0) {
4013 iommu = amd_iommu_rlookup_table[devid];
4014 if (iommu)
4015 return iommu->ir_domain;
4016 }
4017
4018 return NULL;
4019 }
4020
4021 static struct irq_domain *get_irq_domain(struct irq_alloc_info *info)
4022 {
4023 struct amd_iommu *iommu;
4024 int devid;
4025
4026 if (!info)
4027 return NULL;
4028
4029 switch (info->type) {
4030 case X86_IRQ_ALLOC_TYPE_MSI:
4031 case X86_IRQ_ALLOC_TYPE_MSIX:
4032 devid = get_device_id(&info->msi_dev->dev);
4033 if (devid < 0)
4034 return NULL;
4035
4036 iommu = amd_iommu_rlookup_table[devid];
4037 if (iommu)
4038 return iommu->msi_domain;
4039 break;
4040 default:
4041 break;
4042 }
4043
4044 return NULL;
4045 }
4046
4047 struct irq_remap_ops amd_iommu_irq_ops = {
4048 .prepare = amd_iommu_prepare,
4049 .enable = amd_iommu_enable,
4050 .disable = amd_iommu_disable,
4051 .reenable = amd_iommu_reenable,
4052 .enable_faulting = amd_iommu_enable_faulting,
4053 .get_ir_irq_domain = get_ir_irq_domain,
4054 .get_irq_domain = get_irq_domain,
4055 };
4056
4057 static void irq_remapping_prepare_irte(struct amd_ir_data *data,
4058 struct irq_cfg *irq_cfg,
4059 struct irq_alloc_info *info,
4060 int devid, int index, int sub_handle)
4061 {
4062 struct irq_2_irte *irte_info = &data->irq_2_irte;
4063 struct msi_msg *msg = &data->msi_entry;
4064 struct IO_APIC_route_entry *entry;
4065 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
4066
4067 if (!iommu)
4068 return;
4069
4070 data->irq_2_irte.devid = devid;
4071 data->irq_2_irte.index = index + sub_handle;
4072 iommu->irte_ops->prepare(data->entry, apic->irq_delivery_mode,
4073 apic->irq_dest_mode, irq_cfg->vector,
4074 irq_cfg->dest_apicid, devid);
4075
4076 switch (info->type) {
4077 case X86_IRQ_ALLOC_TYPE_IOAPIC:
4078 /* Setup IOAPIC entry */
4079 entry = info->ioapic_entry;
4080 info->ioapic_entry = NULL;
4081 memset(entry, 0, sizeof(*entry));
4082 entry->vector = index;
4083 entry->mask = 0;
4084 entry->trigger = info->ioapic_trigger;
4085 entry->polarity = info->ioapic_polarity;
4086 /* Mask level triggered irqs. */
4087 if (info->ioapic_trigger)
4088 entry->mask = 1;
4089 break;
4090
4091 case X86_IRQ_ALLOC_TYPE_HPET:
4092 case X86_IRQ_ALLOC_TYPE_MSI:
4093 case X86_IRQ_ALLOC_TYPE_MSIX:
4094 msg->address_hi = MSI_ADDR_BASE_HI;
4095 msg->address_lo = MSI_ADDR_BASE_LO;
4096 msg->data = irte_info->index;
4097 break;
4098
4099 default:
4100 BUG_ON(1);
4101 break;
4102 }
4103 }
4104
4105 struct amd_irte_ops irte_32_ops = {
4106 .prepare = irte_prepare,
4107 .activate = irte_activate,
4108 .deactivate = irte_deactivate,
4109 .set_affinity = irte_set_affinity,
4110 .set_allocated = irte_set_allocated,
4111 .is_allocated = irte_is_allocated,
4112 .clear_allocated = irte_clear_allocated,
4113 };
4114
4115 struct amd_irte_ops irte_128_ops = {
4116 .prepare = irte_ga_prepare,
4117 .activate = irte_ga_activate,
4118 .deactivate = irte_ga_deactivate,
4119 .set_affinity = irte_ga_set_affinity,
4120 .set_allocated = irte_ga_set_allocated,
4121 .is_allocated = irte_ga_is_allocated,
4122 .clear_allocated = irte_ga_clear_allocated,
4123 };
4124
4125 static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
4126 unsigned int nr_irqs, void *arg)
4127 {
4128 struct irq_alloc_info *info = arg;
4129 struct irq_data *irq_data;
4130 struct amd_ir_data *data = NULL;
4131 struct irq_cfg *cfg;
4132 int i, ret, devid;
4133 int index = -1;
4134
4135 if (!info)
4136 return -EINVAL;
4137 if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_MSI &&
4138 info->type != X86_IRQ_ALLOC_TYPE_MSIX)
4139 return -EINVAL;
4140
4141 /*
4142 * With IRQ remapping enabled, don't need contiguous CPU vectors
4143 * to support multiple MSI interrupts.
4144 */
4145 if (info->type == X86_IRQ_ALLOC_TYPE_MSI)
4146 info->flags &= ~X86_IRQ_ALLOC_CONTIGUOUS_VECTORS;
4147
4148 devid = get_devid(info);
4149 if (devid < 0)
4150 return -EINVAL;
4151
4152 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
4153 if (ret < 0)
4154 return ret;
4155
4156 if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) {
4157 if (get_irq_table(devid, true))
4158 index = info->ioapic_pin;
4159 else
4160 ret = -ENOMEM;
4161 } else {
4162 index = alloc_irq_index(devid, nr_irqs);
4163 }
4164 if (index < 0) {
4165 pr_warn("Failed to allocate IRTE\n");
4166 ret = index;
4167 goto out_free_parent;
4168 }
4169
4170 for (i = 0; i < nr_irqs; i++) {
4171 irq_data = irq_domain_get_irq_data(domain, virq + i);
4172 cfg = irqd_cfg(irq_data);
4173 if (!irq_data || !cfg) {
4174 ret = -EINVAL;
4175 goto out_free_data;
4176 }
4177
4178 ret = -ENOMEM;
4179 data = kzalloc(sizeof(*data), GFP_KERNEL);
4180 if (!data)
4181 goto out_free_data;
4182
4183 if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
4184 data->entry = kzalloc(sizeof(union irte), GFP_KERNEL);
4185 else
4186 data->entry = kzalloc(sizeof(struct irte_ga),
4187 GFP_KERNEL);
4188 if (!data->entry) {
4189 kfree(data);
4190 goto out_free_data;
4191 }
4192
4193 irq_data->hwirq = (devid << 16) + i;
4194 irq_data->chip_data = data;
4195 irq_data->chip = &amd_ir_chip;
4196 irq_remapping_prepare_irte(data, cfg, info, devid, index, i);
4197 irq_set_status_flags(virq + i, IRQ_MOVE_PCNTXT);
4198 }
4199
4200 return 0;
4201
4202 out_free_data:
4203 for (i--; i >= 0; i--) {
4204 irq_data = irq_domain_get_irq_data(domain, virq + i);
4205 if (irq_data)
4206 kfree(irq_data->chip_data);
4207 }
4208 for (i = 0; i < nr_irqs; i++)
4209 free_irte(devid, index + i);
4210 out_free_parent:
4211 irq_domain_free_irqs_common(domain, virq, nr_irqs);
4212 return ret;
4213 }
4214
4215 static void irq_remapping_free(struct irq_domain *domain, unsigned int virq,
4216 unsigned int nr_irqs)
4217 {
4218 struct irq_2_irte *irte_info;
4219 struct irq_data *irq_data;
4220 struct amd_ir_data *data;
4221 int i;
4222
4223 for (i = 0; i < nr_irqs; i++) {
4224 irq_data = irq_domain_get_irq_data(domain, virq + i);
4225 if (irq_data && irq_data->chip_data) {
4226 data = irq_data->chip_data;
4227 irte_info = &data->irq_2_irte;
4228 free_irte(irte_info->devid, irte_info->index);
4229 kfree(data->entry);
4230 kfree(data);
4231 }
4232 }
4233 irq_domain_free_irqs_common(domain, virq, nr_irqs);
4234 }
4235
4236 static void irq_remapping_activate(struct irq_domain *domain,
4237 struct irq_data *irq_data)
4238 {
4239 struct amd_ir_data *data = irq_data->chip_data;
4240 struct irq_2_irte *irte_info = &data->irq_2_irte;
4241 struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid];
4242
4243 if (iommu)
4244 iommu->irte_ops->activate(data->entry, irte_info->devid,
4245 irte_info->index);
4246 }
4247
4248 static void irq_remapping_deactivate(struct irq_domain *domain,
4249 struct irq_data *irq_data)
4250 {
4251 struct amd_ir_data *data = irq_data->chip_data;
4252 struct irq_2_irte *irte_info = &data->irq_2_irte;
4253 struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid];
4254
4255 if (iommu)
4256 iommu->irte_ops->deactivate(data->entry, irte_info->devid,
4257 irte_info->index);
4258 }
4259
4260 static struct irq_domain_ops amd_ir_domain_ops = {
4261 .alloc = irq_remapping_alloc,
4262 .free = irq_remapping_free,
4263 .activate = irq_remapping_activate,
4264 .deactivate = irq_remapping_deactivate,
4265 };
4266
4267 static int amd_ir_set_vcpu_affinity(struct irq_data *data, void *vcpu_info)
4268 {
4269 struct amd_iommu *iommu;
4270 struct amd_iommu_pi_data *pi_data = vcpu_info;
4271 struct vcpu_data *vcpu_pi_info = pi_data->vcpu_data;
4272 struct amd_ir_data *ir_data = data->chip_data;
4273 struct irte_ga *irte = (struct irte_ga *) ir_data->entry;
4274 struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
4275 struct iommu_dev_data *dev_data = search_dev_data(irte_info->devid);
4276
4277 /* Note:
4278 * This device has never been set up for guest mode.
4279 * we should not modify the IRTE
4280 */
4281 if (!dev_data || !dev_data->use_vapic)
4282 return 0;
4283
4284 pi_data->ir_data = ir_data;
4285
4286 /* Note:
4287 * SVM tries to set up for VAPIC mode, but we are in
4288 * legacy mode. So, we force legacy mode instead.
4289 */
4290 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir)) {
4291 pr_debug("AMD-Vi: %s: Fall back to using intr legacy remap\n",
4292 __func__);
4293 pi_data->is_guest_mode = false;
4294 }
4295
4296 iommu = amd_iommu_rlookup_table[irte_info->devid];
4297 if (iommu == NULL)
4298 return -EINVAL;
4299
4300 pi_data->prev_ga_tag = ir_data->cached_ga_tag;
4301 if (pi_data->is_guest_mode) {
4302 /* Setting */
4303 irte->hi.fields.ga_root_ptr = (pi_data->base >> 12);
4304 irte->hi.fields.vector = vcpu_pi_info->vector;
4305 irte->lo.fields_vapic.guest_mode = 1;
4306 irte->lo.fields_vapic.ga_tag = pi_data->ga_tag;
4307
4308 ir_data->cached_ga_tag = pi_data->ga_tag;
4309 } else {
4310 /* Un-Setting */
4311 struct irq_cfg *cfg = irqd_cfg(data);
4312
4313 irte->hi.val = 0;
4314 irte->lo.val = 0;
4315 irte->hi.fields.vector = cfg->vector;
4316 irte->lo.fields_remap.guest_mode = 0;
4317 irte->lo.fields_remap.destination = cfg->dest_apicid;
4318 irte->lo.fields_remap.int_type = apic->irq_delivery_mode;
4319 irte->lo.fields_remap.dm = apic->irq_dest_mode;
4320
4321 /*
4322 * This communicates the ga_tag back to the caller
4323 * so that it can do all the necessary clean up.
4324 */
4325 ir_data->cached_ga_tag = 0;
4326 }
4327
4328 return modify_irte_ga(irte_info->devid, irte_info->index, irte, ir_data);
4329 }
4330
4331 static int amd_ir_set_affinity(struct irq_data *data,
4332 const struct cpumask *mask, bool force)
4333 {
4334 struct amd_ir_data *ir_data = data->chip_data;
4335 struct irq_2_irte *irte_info = &ir_data->irq_2_irte;
4336 struct irq_cfg *cfg = irqd_cfg(data);
4337 struct irq_data *parent = data->parent_data;
4338 struct amd_iommu *iommu = amd_iommu_rlookup_table[irte_info->devid];
4339 int ret;
4340
4341 if (!iommu)
4342 return -ENODEV;
4343
4344 ret = parent->chip->irq_set_affinity(parent, mask, force);
4345 if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE)
4346 return ret;
4347
4348 /*
4349 * Atomically updates the IRTE with the new destination, vector
4350 * and flushes the interrupt entry cache.
4351 */
4352 iommu->irte_ops->set_affinity(ir_data->entry, irte_info->devid,
4353 irte_info->index, cfg->vector, cfg->dest_apicid);
4354
4355 /*
4356 * After this point, all the interrupts will start arriving
4357 * at the new destination. So, time to cleanup the previous
4358 * vector allocation.
4359 */
4360 send_cleanup_vector(cfg);
4361
4362 return IRQ_SET_MASK_OK_DONE;
4363 }
4364
4365 static void ir_compose_msi_msg(struct irq_data *irq_data, struct msi_msg *msg)
4366 {
4367 struct amd_ir_data *ir_data = irq_data->chip_data;
4368
4369 *msg = ir_data->msi_entry;
4370 }
4371
4372 static struct irq_chip amd_ir_chip = {
4373 .irq_ack = ir_ack_apic_edge,
4374 .irq_set_affinity = amd_ir_set_affinity,
4375 .irq_set_vcpu_affinity = amd_ir_set_vcpu_affinity,
4376 .irq_compose_msi_msg = ir_compose_msi_msg,
4377 };
4378
4379 int amd_iommu_create_irq_domain(struct amd_iommu *iommu)
4380 {
4381 iommu->ir_domain = irq_domain_add_tree(NULL, &amd_ir_domain_ops, iommu);
4382 if (!iommu->ir_domain)
4383 return -ENOMEM;
4384
4385 iommu->ir_domain->parent = arch_get_ir_parent_domain();
4386 iommu->msi_domain = arch_create_msi_irq_domain(iommu->ir_domain);
4387
4388 return 0;
4389 }
4390
4391 int amd_iommu_update_ga(int cpu, bool is_run, void *data)
4392 {
4393 unsigned long flags;
4394 struct amd_iommu *iommu;
4395 struct irq_remap_table *irt;
4396 struct amd_ir_data *ir_data = (struct amd_ir_data *)data;
4397 int devid = ir_data->irq_2_irte.devid;
4398 struct irte_ga *entry = (struct irte_ga *) ir_data->entry;
4399 struct irte_ga *ref = (struct irte_ga *) ir_data->ref;
4400
4401 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) ||
4402 !ref || !entry || !entry->lo.fields_vapic.guest_mode)
4403 return 0;
4404
4405 iommu = amd_iommu_rlookup_table[devid];
4406 if (!iommu)
4407 return -ENODEV;
4408
4409 irt = get_irq_table(devid, false);
4410 if (!irt)
4411 return -ENODEV;
4412
4413 spin_lock_irqsave(&irt->lock, flags);
4414
4415 if (ref->lo.fields_vapic.guest_mode) {
4416 if (cpu >= 0)
4417 ref->lo.fields_vapic.destination = cpu;
4418 ref->lo.fields_vapic.is_run = is_run;
4419 barrier();
4420 }
4421
4422 spin_unlock_irqrestore(&irt->lock, flags);
4423
4424 iommu_flush_irt(iommu, devid);
4425 iommu_completion_wait(iommu);
4426 return 0;
4427 }
4428 EXPORT_SYMBOL(amd_iommu_update_ga);
4429 #endif
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