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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[cris-mirror.git] / drivers / gpu / drm / i915 / gvt / kvmgt.c
blob021f722e248165d461953999b02a7683d37dc7fa
1 /*
2 * KVMGT - the implementation of Intel mediated pass-through framework for KVM
3 *
4 * Copyright(c) 2014-2016 Intel Corporation. All rights reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice (including the next
14 * paragraph) shall be included in all copies or substantial portions of the
15 * Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Authors:
26 * Kevin Tian <kevin.tian@intel.com>
27 * Jike Song <jike.song@intel.com>
28 * Xiaoguang Chen <xiaoguang.chen@intel.com>
29 */
30
31 #include <linux/init.h>
32 #include <linux/device.h>
33 #include <linux/mm.h>
34 #include <linux/mmu_context.h>
35 #include <linux/types.h>
36 #include <linux/list.h>
37 #include <linux/rbtree.h>
38 #include <linux/spinlock.h>
39 #include <linux/eventfd.h>
40 #include <linux/uuid.h>
41 #include <linux/kvm_host.h>
42 #include <linux/vfio.h>
43 #include <linux/mdev.h>
44
45 #include "i915_drv.h"
46 #include "gvt.h"
47
48 static const struct intel_gvt_ops *intel_gvt_ops;
49
50 /* helper macros copied from vfio-pci */
51 #define VFIO_PCI_OFFSET_SHIFT 40
52 #define VFIO_PCI_OFFSET_TO_INDEX(off) (off >> VFIO_PCI_OFFSET_SHIFT)
53 #define VFIO_PCI_INDEX_TO_OFFSET(index) ((u64)(index) << VFIO_PCI_OFFSET_SHIFT)
54 #define VFIO_PCI_OFFSET_MASK (((u64)(1) << VFIO_PCI_OFFSET_SHIFT) - 1)
55
56 #define OPREGION_SIGNATURE "IntelGraphicsMem"
57
58 struct vfio_region;
59 struct intel_vgpu_regops {
60 size_t (*rw)(struct intel_vgpu *vgpu, char *buf,
61 size_t count, loff_t *ppos, bool iswrite);
62 void (*release)(struct intel_vgpu *vgpu,
63 struct vfio_region *region);
64 };
65
66 struct vfio_region {
67 u32 type;
68 u32 subtype;
69 size_t size;
70 u32 flags;
71 const struct intel_vgpu_regops *ops;
72 void *data;
73 };
74
75 struct kvmgt_pgfn {
76 gfn_t gfn;
77 struct hlist_node hnode;
78 };
79
80 struct kvmgt_guest_info {
81 struct kvm *kvm;
82 struct intel_vgpu *vgpu;
83 struct kvm_page_track_notifier_node track_node;
84 #define NR_BKT (1 << 18)
85 struct hlist_head ptable[NR_BKT];
86 #undef NR_BKT
87 };
88
89 struct gvt_dma {
90 struct rb_node node;
91 gfn_t gfn;
92 unsigned long iova;
93 };
94
95 static inline bool handle_valid(unsigned long handle)
96 {
97 return !!(handle & ~0xff);
98 }
99
100 static int kvmgt_guest_init(struct mdev_device *mdev);
101 static void intel_vgpu_release_work(struct work_struct *work);
102 static bool kvmgt_guest_exit(struct kvmgt_guest_info *info);
103
104 static int gvt_dma_map_iova(struct intel_vgpu *vgpu, kvm_pfn_t pfn,
105 unsigned long *iova)
106 {
107 struct page *page;
108 struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
109 dma_addr_t daddr;
110
111 if (unlikely(!pfn_valid(pfn)))
112 return -EFAULT;
113
114 page = pfn_to_page(pfn);
115 daddr = dma_map_page(dev, page, 0, PAGE_SIZE,
116 PCI_DMA_BIDIRECTIONAL);
117 if (dma_mapping_error(dev, daddr))
118 return -ENOMEM;
119
120 *iova = (unsigned long)(daddr >> PAGE_SHIFT);
121 return 0;
122 }
123
124 static void gvt_dma_unmap_iova(struct intel_vgpu *vgpu, unsigned long iova)
125 {
126 struct device *dev = &vgpu->gvt->dev_priv->drm.pdev->dev;
127 dma_addr_t daddr;
128
129 daddr = (dma_addr_t)(iova << PAGE_SHIFT);
130 dma_unmap_page(dev, daddr, PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
131 }
132
133 static struct gvt_dma *__gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)
134 {
135 struct rb_node *node = vgpu->vdev.cache.rb_node;
136 struct gvt_dma *ret = NULL;
137
138 while (node) {
139 struct gvt_dma *itr = rb_entry(node, struct gvt_dma, node);
140
141 if (gfn < itr->gfn)
142 node = node->rb_left;
143 else if (gfn > itr->gfn)
144 node = node->rb_right;
145 else {
146 ret = itr;
147 goto out;
148 }
149 }
150
151 out:
152 return ret;
153 }
154
155 static unsigned long gvt_cache_find(struct intel_vgpu *vgpu, gfn_t gfn)
156 {
157 struct gvt_dma *entry;
158 unsigned long iova;
159
160 mutex_lock(&vgpu->vdev.cache_lock);
161
162 entry = __gvt_cache_find(vgpu, gfn);
163 iova = (entry == NULL) ? INTEL_GVT_INVALID_ADDR : entry->iova;
164
165 mutex_unlock(&vgpu->vdev.cache_lock);
166 return iova;
167 }
168
169 static void gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
170 unsigned long iova)
171 {
172 struct gvt_dma *new, *itr;
173 struct rb_node **link = &vgpu->vdev.cache.rb_node, *parent = NULL;
174
175 new = kzalloc(sizeof(struct gvt_dma), GFP_KERNEL);
176 if (!new)
177 return;
178
179 new->gfn = gfn;
180 new->iova = iova;
181
182 mutex_lock(&vgpu->vdev.cache_lock);
183 while (*link) {
184 parent = *link;
185 itr = rb_entry(parent, struct gvt_dma, node);
186
187 if (gfn == itr->gfn)
188 goto out;
189 else if (gfn < itr->gfn)
190 link = &parent->rb_left;
191 else
192 link = &parent->rb_right;
193 }
194
195 rb_link_node(&new->node, parent, link);
196 rb_insert_color(&new->node, &vgpu->vdev.cache);
197 mutex_unlock(&vgpu->vdev.cache_lock);
198 return;
199
200 out:
201 mutex_unlock(&vgpu->vdev.cache_lock);
202 kfree(new);
203 }
204
205 static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
206 struct gvt_dma *entry)
207 {
208 rb_erase(&entry->node, &vgpu->vdev.cache);
209 kfree(entry);
210 }
211
212 static void gvt_cache_remove(struct intel_vgpu *vgpu, gfn_t gfn)
213 {
214 struct device *dev = mdev_dev(vgpu->vdev.mdev);
215 struct gvt_dma *this;
216 unsigned long g1;
217 int rc;
218
219 mutex_lock(&vgpu->vdev.cache_lock);
220 this = __gvt_cache_find(vgpu, gfn);
221 if (!this) {
222 mutex_unlock(&vgpu->vdev.cache_lock);
223 return;
224 }
225
226 g1 = gfn;
227 gvt_dma_unmap_iova(vgpu, this->iova);
228 rc = vfio_unpin_pages(dev, &g1, 1);
229 WARN_ON(rc != 1);
230 __gvt_cache_remove_entry(vgpu, this);
231 mutex_unlock(&vgpu->vdev.cache_lock);
232 }
233
234 static void gvt_cache_init(struct intel_vgpu *vgpu)
235 {
236 vgpu->vdev.cache = RB_ROOT;
237 mutex_init(&vgpu->vdev.cache_lock);
238 }
239
240 static void gvt_cache_destroy(struct intel_vgpu *vgpu)
241 {
242 struct gvt_dma *dma;
243 struct rb_node *node = NULL;
244 struct device *dev = mdev_dev(vgpu->vdev.mdev);
245 unsigned long gfn;
246
247 for (;;) {
248 mutex_lock(&vgpu->vdev.cache_lock);
249 node = rb_first(&vgpu->vdev.cache);
250 if (!node) {
251 mutex_unlock(&vgpu->vdev.cache_lock);
252 break;
253 }
254 dma = rb_entry(node, struct gvt_dma, node);
255 gvt_dma_unmap_iova(vgpu, dma->iova);
256 gfn = dma->gfn;
257 __gvt_cache_remove_entry(vgpu, dma);
258 mutex_unlock(&vgpu->vdev.cache_lock);
259 vfio_unpin_pages(dev, &gfn, 1);
260 }
261 }
262
263 static void kvmgt_protect_table_init(struct kvmgt_guest_info *info)
264 {
265 hash_init(info->ptable);
266 }
267
268 static void kvmgt_protect_table_destroy(struct kvmgt_guest_info *info)
269 {
270 struct kvmgt_pgfn *p;
271 struct hlist_node *tmp;
272 int i;
273
274 hash_for_each_safe(info->ptable, i, tmp, p, hnode) {
275 hash_del(&p->hnode);
276 kfree(p);
277 }
278 }
279
280 static struct kvmgt_pgfn *
281 __kvmgt_protect_table_find(struct kvmgt_guest_info *info, gfn_t gfn)
282 {
283 struct kvmgt_pgfn *p, *res = NULL;
284
285 hash_for_each_possible(info->ptable, p, hnode, gfn) {
286 if (gfn == p->gfn) {
287 res = p;
288 break;
289 }
290 }
291
292 return res;
293 }
294
295 static bool kvmgt_gfn_is_write_protected(struct kvmgt_guest_info *info,
296 gfn_t gfn)
297 {
298 struct kvmgt_pgfn *p;
299
300 p = __kvmgt_protect_table_find(info, gfn);
301 return !!p;
302 }
303
304 static void kvmgt_protect_table_add(struct kvmgt_guest_info *info, gfn_t gfn)
305 {
306 struct kvmgt_pgfn *p;
307
308 if (kvmgt_gfn_is_write_protected(info, gfn))
309 return;
310
311 p = kzalloc(sizeof(struct kvmgt_pgfn), GFP_ATOMIC);
312 if (WARN(!p, "gfn: 0x%llx\n", gfn))
313 return;
314
315 p->gfn = gfn;
316 hash_add(info->ptable, &p->hnode, gfn);
317 }
318
319 static void kvmgt_protect_table_del(struct kvmgt_guest_info *info,
320 gfn_t gfn)
321 {
322 struct kvmgt_pgfn *p;
323
324 p = __kvmgt_protect_table_find(info, gfn);
325 if (p) {
326 hash_del(&p->hnode);
327 kfree(p);
328 }
329 }
330
331 static size_t intel_vgpu_reg_rw_opregion(struct intel_vgpu *vgpu, char *buf,
332 size_t count, loff_t *ppos, bool iswrite)
333 {
334 unsigned int i = VFIO_PCI_OFFSET_TO_INDEX(*ppos) -
335 VFIO_PCI_NUM_REGIONS;
336 void *base = vgpu->vdev.region[i].data;
337 loff_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
338
339 if (pos >= vgpu->vdev.region[i].size || iswrite) {
340 gvt_vgpu_err("invalid op or offset for Intel vgpu OpRegion\n");
341 return -EINVAL;
342 }
343 count = min(count, (size_t)(vgpu->vdev.region[i].size - pos));
344 memcpy(buf, base + pos, count);
345
346 return count;
347 }
348
349 static void intel_vgpu_reg_release_opregion(struct intel_vgpu *vgpu,
350 struct vfio_region *region)
351 {
352 }
353
354 static const struct intel_vgpu_regops intel_vgpu_regops_opregion = {
355 .rw = intel_vgpu_reg_rw_opregion,
356 .release = intel_vgpu_reg_release_opregion,
357 };
358
359 static int intel_vgpu_register_reg(struct intel_vgpu *vgpu,
360 unsigned int type, unsigned int subtype,
361 const struct intel_vgpu_regops *ops,
362 size_t size, u32 flags, void *data)
363 {
364 struct vfio_region *region;
365
366 region = krealloc(vgpu->vdev.region,
367 (vgpu->vdev.num_regions + 1) * sizeof(*region),
368 GFP_KERNEL);
369 if (!region)
370 return -ENOMEM;
371
372 vgpu->vdev.region = region;
373 vgpu->vdev.region[vgpu->vdev.num_regions].type = type;
374 vgpu->vdev.region[vgpu->vdev.num_regions].subtype = subtype;
375 vgpu->vdev.region[vgpu->vdev.num_regions].ops = ops;
376 vgpu->vdev.region[vgpu->vdev.num_regions].size = size;
377 vgpu->vdev.region[vgpu->vdev.num_regions].flags = flags;
378 vgpu->vdev.region[vgpu->vdev.num_regions].data = data;
379 vgpu->vdev.num_regions++;
380 return 0;
381 }
382
383 static int kvmgt_get_vfio_device(void *p_vgpu)
384 {
385 struct intel_vgpu *vgpu = (struct intel_vgpu *)p_vgpu;
386
387 vgpu->vdev.vfio_device = vfio_device_get_from_dev(
388 mdev_dev(vgpu->vdev.mdev));
389 if (!vgpu->vdev.vfio_device) {
390 gvt_vgpu_err("failed to get vfio device\n");
391 return -ENODEV;
392 }
393 return 0;
394 }
395
396
397 static int kvmgt_set_opregion(void *p_vgpu)
398 {
399 struct intel_vgpu *vgpu = (struct intel_vgpu *)p_vgpu;
400 void *base;
401 int ret;
402
403 /* Each vgpu has its own opregion, although VFIO would create another
404 * one later. This one is used to expose opregion to VFIO. And the
405 * other one created by VFIO later, is used by guest actually.
406 */
407 base = vgpu_opregion(vgpu)->va;
408 if (!base)
409 return -ENOMEM;
410
411 if (memcmp(base, OPREGION_SIGNATURE, 16)) {
412 memunmap(base);
413 return -EINVAL;
414 }
415
416 ret = intel_vgpu_register_reg(vgpu,
417 PCI_VENDOR_ID_INTEL | VFIO_REGION_TYPE_PCI_VENDOR_TYPE,
418 VFIO_REGION_SUBTYPE_INTEL_IGD_OPREGION,
419 &intel_vgpu_regops_opregion, OPREGION_SIZE,
420 VFIO_REGION_INFO_FLAG_READ, base);
421
422 return ret;
423 }
424
425 static void kvmgt_put_vfio_device(void *vgpu)
426 {
427 if (WARN_ON(!((struct intel_vgpu *)vgpu)->vdev.vfio_device))
428 return;
429
430 vfio_device_put(((struct intel_vgpu *)vgpu)->vdev.vfio_device);
431 }
432
433 static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
434 {
435 struct intel_vgpu *vgpu = NULL;
436 struct intel_vgpu_type *type;
437 struct device *pdev;
438 void *gvt;
439 int ret;
440
441 pdev = mdev_parent_dev(mdev);
442 gvt = kdev_to_i915(pdev)->gvt;
443
444 type = intel_gvt_ops->gvt_find_vgpu_type(gvt, kobject_name(kobj));
445 if (!type) {
446 gvt_vgpu_err("failed to find type %s to create\n",
447 kobject_name(kobj));
448 ret = -EINVAL;
449 goto out;
450 }
451
452 vgpu = intel_gvt_ops->vgpu_create(gvt, type);
453 if (IS_ERR_OR_NULL(vgpu)) {
454 ret = vgpu == NULL ? -EFAULT : PTR_ERR(vgpu);
455 gvt_vgpu_err("failed to create intel vgpu: %d\n", ret);
456 goto out;
457 }
458
459 INIT_WORK(&vgpu->vdev.release_work, intel_vgpu_release_work);
460
461 vgpu->vdev.mdev = mdev;
462 mdev_set_drvdata(mdev, vgpu);
463
464 gvt_dbg_core("intel_vgpu_create succeeded for mdev: %s\n",
465 dev_name(mdev_dev(mdev)));
466 ret = 0;
467
468 out:
469 return ret;
470 }
471
472 static int intel_vgpu_remove(struct mdev_device *mdev)
473 {
474 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
475
476 if (handle_valid(vgpu->handle))
477 return -EBUSY;
478
479 intel_gvt_ops->vgpu_destroy(vgpu);
480 return 0;
481 }
482
483 static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
484 unsigned long action, void *data)
485 {
486 struct intel_vgpu *vgpu = container_of(nb,
487 struct intel_vgpu,
488 vdev.iommu_notifier);
489
490 if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
491 struct vfio_iommu_type1_dma_unmap *unmap = data;
492 unsigned long gfn, end_gfn;
493
494 gfn = unmap->iova >> PAGE_SHIFT;
495 end_gfn = gfn + unmap->size / PAGE_SIZE;
496
497 while (gfn < end_gfn)
498 gvt_cache_remove(vgpu, gfn++);
499 }
500
501 return NOTIFY_OK;
502 }
503
504 static int intel_vgpu_group_notifier(struct notifier_block *nb,
505 unsigned long action, void *data)
506 {
507 struct intel_vgpu *vgpu = container_of(nb,
508 struct intel_vgpu,
509 vdev.group_notifier);
510
511 /* the only action we care about */
512 if (action == VFIO_GROUP_NOTIFY_SET_KVM) {
513 vgpu->vdev.kvm = data;
514
515 if (!data)
516 schedule_work(&vgpu->vdev.release_work);
517 }
518
519 return NOTIFY_OK;
520 }
521
522 static int intel_vgpu_open(struct mdev_device *mdev)
523 {
524 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
525 unsigned long events;
526 int ret;
527
528 vgpu->vdev.iommu_notifier.notifier_call = intel_vgpu_iommu_notifier;
529 vgpu->vdev.group_notifier.notifier_call = intel_vgpu_group_notifier;
530
531 events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
532 ret = vfio_register_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY, &events,
533 &vgpu->vdev.iommu_notifier);
534 if (ret != 0) {
535 gvt_vgpu_err("vfio_register_notifier for iommu failed: %d\n",
536 ret);
537 goto out;
538 }
539
540 events = VFIO_GROUP_NOTIFY_SET_KVM;
541 ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY, &events,
542 &vgpu->vdev.group_notifier);
543 if (ret != 0) {
544 gvt_vgpu_err("vfio_register_notifier for group failed: %d\n",
545 ret);
546 goto undo_iommu;
547 }
548
549 ret = kvmgt_guest_init(mdev);
550 if (ret)
551 goto undo_group;
552
553 intel_gvt_ops->vgpu_activate(vgpu);
554
555 atomic_set(&vgpu->vdev.released, 0);
556 return ret;
557
558 undo_group:
559 vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
560 &vgpu->vdev.group_notifier);
561
562 undo_iommu:
563 vfio_unregister_notifier(mdev_dev(mdev), VFIO_IOMMU_NOTIFY,
564 &vgpu->vdev.iommu_notifier);
565 out:
566 return ret;
567 }
568
569 static void __intel_vgpu_release(struct intel_vgpu *vgpu)
570 {
571 struct kvmgt_guest_info *info;
572 int ret;
573
574 if (!handle_valid(vgpu->handle))
575 return;
576
577 if (atomic_cmpxchg(&vgpu->vdev.released, 0, 1))
578 return;
579
580 intel_gvt_ops->vgpu_deactivate(vgpu);
581
582 ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_IOMMU_NOTIFY,
583 &vgpu->vdev.iommu_notifier);
584 WARN(ret, "vfio_unregister_notifier for iommu failed: %d\n", ret);
585
586 ret = vfio_unregister_notifier(mdev_dev(vgpu->vdev.mdev), VFIO_GROUP_NOTIFY,
587 &vgpu->vdev.group_notifier);
588 WARN(ret, "vfio_unregister_notifier for group failed: %d\n", ret);
589
590 info = (struct kvmgt_guest_info *)vgpu->handle;
591 kvmgt_guest_exit(info);
592
593 vgpu->vdev.kvm = NULL;
594 vgpu->handle = 0;
595 }
596
597 static void intel_vgpu_release(struct mdev_device *mdev)
598 {
599 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
600
601 __intel_vgpu_release(vgpu);
602 }
603
604 static void intel_vgpu_release_work(struct work_struct *work)
605 {
606 struct intel_vgpu *vgpu = container_of(work, struct intel_vgpu,
607 vdev.release_work);
608
609 __intel_vgpu_release(vgpu);
610 }
611
612 static uint64_t intel_vgpu_get_bar_addr(struct intel_vgpu *vgpu, int bar)
613 {
614 u32 start_lo, start_hi;
615 u32 mem_type;
616
617 start_lo = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + bar)) &
618 PCI_BASE_ADDRESS_MEM_MASK;
619 mem_type = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space + bar)) &
620 PCI_BASE_ADDRESS_MEM_TYPE_MASK;
621
622 switch (mem_type) {
623 case PCI_BASE_ADDRESS_MEM_TYPE_64:
624 start_hi = (*(u32 *)(vgpu->cfg_space.virtual_cfg_space
625 + bar + 4));
626 break;
627 case PCI_BASE_ADDRESS_MEM_TYPE_32:
628 case PCI_BASE_ADDRESS_MEM_TYPE_1M:
629 /* 1M mem BAR treated as 32-bit BAR */
630 default:
631 /* mem unknown type treated as 32-bit BAR */
632 start_hi = 0;
633 break;
634 }
635
636 return ((u64)start_hi << 32) | start_lo;
637 }
638
639 static int intel_vgpu_bar_rw(struct intel_vgpu *vgpu, int bar, uint64_t off,
640 void *buf, unsigned int count, bool is_write)
641 {
642 uint64_t bar_start = intel_vgpu_get_bar_addr(vgpu, bar);
643 int ret;
644
645 if (is_write)
646 ret = intel_gvt_ops->emulate_mmio_write(vgpu,
647 bar_start + off, buf, count);
648 else
649 ret = intel_gvt_ops->emulate_mmio_read(vgpu,
650 bar_start + off, buf, count);
651 return ret;
652 }
653
654 static inline bool intel_vgpu_in_aperture(struct intel_vgpu *vgpu, uint64_t off)
655 {
656 return off >= vgpu_aperture_offset(vgpu) &&
657 off < vgpu_aperture_offset(vgpu) + vgpu_aperture_sz(vgpu);
658 }
659
660 static int intel_vgpu_aperture_rw(struct intel_vgpu *vgpu, uint64_t off,
661 void *buf, unsigned long count, bool is_write)
662 {
663 void *aperture_va;
664
665 if (!intel_vgpu_in_aperture(vgpu, off) ||
666 !intel_vgpu_in_aperture(vgpu, off + count)) {
667 gvt_vgpu_err("Invalid aperture offset %llu\n", off);
668 return -EINVAL;
669 }
670
671 aperture_va = io_mapping_map_wc(&vgpu->gvt->dev_priv->ggtt.iomap,
672 ALIGN_DOWN(off, PAGE_SIZE),
673 count + offset_in_page(off));
674 if (!aperture_va)
675 return -EIO;
676
677 if (is_write)
678 memcpy(aperture_va + offset_in_page(off), buf, count);
679 else
680 memcpy(buf, aperture_va + offset_in_page(off), count);
681
682 io_mapping_unmap(aperture_va);
683
684 return 0;
685 }
686
687 static ssize_t intel_vgpu_rw(struct mdev_device *mdev, char *buf,
688 size_t count, loff_t *ppos, bool is_write)
689 {
690 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
691 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
692 uint64_t pos = *ppos & VFIO_PCI_OFFSET_MASK;
693 int ret = -EINVAL;
694
695
696 if (index >= VFIO_PCI_NUM_REGIONS + vgpu->vdev.num_regions) {
697 gvt_vgpu_err("invalid index: %u\n", index);
698 return -EINVAL;
699 }
700
701 switch (index) {
702 case VFIO_PCI_CONFIG_REGION_INDEX:
703 if (is_write)
704 ret = intel_gvt_ops->emulate_cfg_write(vgpu, pos,
705 buf, count);
706 else
707 ret = intel_gvt_ops->emulate_cfg_read(vgpu, pos,
708 buf, count);
709 break;
710 case VFIO_PCI_BAR0_REGION_INDEX:
711 ret = intel_vgpu_bar_rw(vgpu, PCI_BASE_ADDRESS_0, pos,
712 buf, count, is_write);
713 break;
714 case VFIO_PCI_BAR2_REGION_INDEX:
715 ret = intel_vgpu_aperture_rw(vgpu, pos, buf, count, is_write);
716 break;
717 case VFIO_PCI_BAR1_REGION_INDEX:
718 case VFIO_PCI_BAR3_REGION_INDEX:
719 case VFIO_PCI_BAR4_REGION_INDEX:
720 case VFIO_PCI_BAR5_REGION_INDEX:
721 case VFIO_PCI_VGA_REGION_INDEX:
722 case VFIO_PCI_ROM_REGION_INDEX:
723 break;
724 default:
725 if (index >= VFIO_PCI_NUM_REGIONS + vgpu->vdev.num_regions)
726 return -EINVAL;
727
728 index -= VFIO_PCI_NUM_REGIONS;
729 return vgpu->vdev.region[index].ops->rw(vgpu, buf, count,
730 ppos, is_write);
731 }
732
733 return ret == 0 ? count : ret;
734 }
735
736 static bool gtt_entry(struct mdev_device *mdev, loff_t *ppos)
737 {
738 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
739 unsigned int index = VFIO_PCI_OFFSET_TO_INDEX(*ppos);
740 struct intel_gvt *gvt = vgpu->gvt;
741 int offset;
742
743 /* Only allow MMIO GGTT entry access */
744 if (index != PCI_BASE_ADDRESS_0)
745 return false;
746
747 offset = (u64)(*ppos & VFIO_PCI_OFFSET_MASK) -
748 intel_vgpu_get_bar_gpa(vgpu, PCI_BASE_ADDRESS_0);
749
750 return (offset >= gvt->device_info.gtt_start_offset &&
751 offset < gvt->device_info.gtt_start_offset + gvt_ggtt_sz(gvt)) ?
752 true : false;
753 }
754
755 static ssize_t intel_vgpu_read(struct mdev_device *mdev, char __user *buf,
756 size_t count, loff_t *ppos)
757 {
758 unsigned int done = 0;
759 int ret;
760
761 while (count) {
762 size_t filled;
763
764 /* Only support GGTT entry 8 bytes read */
765 if (count >= 8 && !(*ppos % 8) &&
766 gtt_entry(mdev, ppos)) {
767 u64 val;
768
769 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
770 ppos, false);
771 if (ret <= 0)
772 goto read_err;
773
774 if (copy_to_user(buf, &val, sizeof(val)))
775 goto read_err;
776
777 filled = 8;
778 } else if (count >= 4 && !(*ppos % 4)) {
779 u32 val;
780
781 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
782 ppos, false);
783 if (ret <= 0)
784 goto read_err;
785
786 if (copy_to_user(buf, &val, sizeof(val)))
787 goto read_err;
788
789 filled = 4;
790 } else if (count >= 2 && !(*ppos % 2)) {
791 u16 val;
792
793 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
794 ppos, false);
795 if (ret <= 0)
796 goto read_err;
797
798 if (copy_to_user(buf, &val, sizeof(val)))
799 goto read_err;
800
801 filled = 2;
802 } else {
803 u8 val;
804
805 ret = intel_vgpu_rw(mdev, &val, sizeof(val), ppos,
806 false);
807 if (ret <= 0)
808 goto read_err;
809
810 if (copy_to_user(buf, &val, sizeof(val)))
811 goto read_err;
812
813 filled = 1;
814 }
815
816 count -= filled;
817 done += filled;
818 *ppos += filled;
819 buf += filled;
820 }
821
822 return done;
823
824 read_err:
825 return -EFAULT;
826 }
827
828 static ssize_t intel_vgpu_write(struct mdev_device *mdev,
829 const char __user *buf,
830 size_t count, loff_t *ppos)
831 {
832 unsigned int done = 0;
833 int ret;
834
835 while (count) {
836 size_t filled;
837
838 /* Only support GGTT entry 8 bytes write */
839 if (count >= 8 && !(*ppos % 8) &&
840 gtt_entry(mdev, ppos)) {
841 u64 val;
842
843 if (copy_from_user(&val, buf, sizeof(val)))
844 goto write_err;
845
846 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
847 ppos, true);
848 if (ret <= 0)
849 goto write_err;
850
851 filled = 8;
852 } else if (count >= 4 && !(*ppos % 4)) {
853 u32 val;
854
855 if (copy_from_user(&val, buf, sizeof(val)))
856 goto write_err;
857
858 ret = intel_vgpu_rw(mdev, (char *)&val, sizeof(val),
859 ppos, true);
860 if (ret <= 0)
861 goto write_err;
862
863 filled = 4;
864 } else if (count >= 2 && !(*ppos % 2)) {
865 u16 val;
866
867 if (copy_from_user(&val, buf, sizeof(val)))
868 goto write_err;
869
870 ret = intel_vgpu_rw(mdev, (char *)&val,
871 sizeof(val), ppos, true);
872 if (ret <= 0)
873 goto write_err;
874
875 filled = 2;
876 } else {
877 u8 val;
878
879 if (copy_from_user(&val, buf, sizeof(val)))
880 goto write_err;
881
882 ret = intel_vgpu_rw(mdev, &val, sizeof(val),
883 ppos, true);
884 if (ret <= 0)
885 goto write_err;
886
887 filled = 1;
888 }
889
890 count -= filled;
891 done += filled;
892 *ppos += filled;
893 buf += filled;
894 }
895
896 return done;
897 write_err:
898 return -EFAULT;
899 }
900
901 static int intel_vgpu_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
902 {
903 unsigned int index;
904 u64 virtaddr;
905 unsigned long req_size, pgoff = 0;
906 pgprot_t pg_prot;
907 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
908
909 index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
910 if (index >= VFIO_PCI_ROM_REGION_INDEX)
911 return -EINVAL;
912
913 if (vma->vm_end < vma->vm_start)
914 return -EINVAL;
915 if ((vma->vm_flags & VM_SHARED) == 0)
916 return -EINVAL;
917 if (index != VFIO_PCI_BAR2_REGION_INDEX)
918 return -EINVAL;
919
920 pg_prot = vma->vm_page_prot;
921 virtaddr = vma->vm_start;
922 req_size = vma->vm_end - vma->vm_start;
923 pgoff = vgpu_aperture_pa_base(vgpu) >> PAGE_SHIFT;
924
925 return remap_pfn_range(vma, virtaddr, pgoff, req_size, pg_prot);
926 }
927
928 static int intel_vgpu_get_irq_count(struct intel_vgpu *vgpu, int type)
929 {
930 if (type == VFIO_PCI_INTX_IRQ_INDEX || type == VFIO_PCI_MSI_IRQ_INDEX)
931 return 1;
932
933 return 0;
934 }
935
936 static int intel_vgpu_set_intx_mask(struct intel_vgpu *vgpu,
937 unsigned int index, unsigned int start,
938 unsigned int count, uint32_t flags,
939 void *data)
940 {
941 return 0;
942 }
943
944 static int intel_vgpu_set_intx_unmask(struct intel_vgpu *vgpu,
945 unsigned int index, unsigned int start,
946 unsigned int count, uint32_t flags, void *data)
947 {
948 return 0;
949 }
950
951 static int intel_vgpu_set_intx_trigger(struct intel_vgpu *vgpu,
952 unsigned int index, unsigned int start, unsigned int count,
953 uint32_t flags, void *data)
954 {
955 return 0;
956 }
957
958 static int intel_vgpu_set_msi_trigger(struct intel_vgpu *vgpu,
959 unsigned int index, unsigned int start, unsigned int count,
960 uint32_t flags, void *data)
961 {
962 struct eventfd_ctx *trigger;
963
964 if (flags & VFIO_IRQ_SET_DATA_EVENTFD) {
965 int fd = *(int *)data;
966
967 trigger = eventfd_ctx_fdget(fd);
968 if (IS_ERR(trigger)) {
969 gvt_vgpu_err("eventfd_ctx_fdget failed\n");
970 return PTR_ERR(trigger);
971 }
972 vgpu->vdev.msi_trigger = trigger;
973 }
974
975 return 0;
976 }
977
978 static int intel_vgpu_set_irqs(struct intel_vgpu *vgpu, uint32_t flags,
979 unsigned int index, unsigned int start, unsigned int count,
980 void *data)
981 {
982 int (*func)(struct intel_vgpu *vgpu, unsigned int index,
983 unsigned int start, unsigned int count, uint32_t flags,
984 void *data) = NULL;
985
986 switch (index) {
987 case VFIO_PCI_INTX_IRQ_INDEX:
988 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
989 case VFIO_IRQ_SET_ACTION_MASK:
990 func = intel_vgpu_set_intx_mask;
991 break;
992 case VFIO_IRQ_SET_ACTION_UNMASK:
993 func = intel_vgpu_set_intx_unmask;
994 break;
995 case VFIO_IRQ_SET_ACTION_TRIGGER:
996 func = intel_vgpu_set_intx_trigger;
997 break;
998 }
999 break;
1000 case VFIO_PCI_MSI_IRQ_INDEX:
1001 switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
1002 case VFIO_IRQ_SET_ACTION_MASK:
1003 case VFIO_IRQ_SET_ACTION_UNMASK:
1004 /* XXX Need masking support exported */
1005 break;
1006 case VFIO_IRQ_SET_ACTION_TRIGGER:
1007 func = intel_vgpu_set_msi_trigger;
1008 break;
1009 }
1010 break;
1011 }
1012
1013 if (!func)
1014 return -ENOTTY;
1015
1016 return func(vgpu, index, start, count, flags, data);
1017 }
1018
1019 static long intel_vgpu_ioctl(struct mdev_device *mdev, unsigned int cmd,
1020 unsigned long arg)
1021 {
1022 struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
1023 unsigned long minsz;
1024
1025 gvt_dbg_core("vgpu%d ioctl, cmd: %d\n", vgpu->id, cmd);
1026
1027 if (cmd == VFIO_DEVICE_GET_INFO) {
1028 struct vfio_device_info info;
1029
1030 minsz = offsetofend(struct vfio_device_info, num_irqs);
1031
1032 if (copy_from_user(&info, (void __user *)arg, minsz))
1033 return -EFAULT;
1034
1035 if (info.argsz < minsz)
1036 return -EINVAL;
1037
1038 info.flags = VFIO_DEVICE_FLAGS_PCI;
1039 info.flags |= VFIO_DEVICE_FLAGS_RESET;
1040 info.num_regions = VFIO_PCI_NUM_REGIONS +
1041 vgpu->vdev.num_regions;
1042 info.num_irqs = VFIO_PCI_NUM_IRQS;
1043
1044 return copy_to_user((void __user *)arg, &info, minsz) ?
1045 -EFAULT : 0;
1046
1047 } else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
1048 struct vfio_region_info info;
1049 struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
1050 int i, ret;
1051 struct vfio_region_info_cap_sparse_mmap *sparse = NULL;
1052 size_t size;
1053 int nr_areas = 1;
1054 int cap_type_id;
1055
1056 minsz = offsetofend(struct vfio_region_info, offset);
1057
1058 if (copy_from_user(&info, (void __user *)arg, minsz))
1059 return -EFAULT;
1060
1061 if (info.argsz < minsz)
1062 return -EINVAL;
1063
1064 switch (info.index) {
1065 case VFIO_PCI_CONFIG_REGION_INDEX:
1066 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1067 info.size = vgpu->gvt->device_info.cfg_space_size;
1068 info.flags = VFIO_REGION_INFO_FLAG_READ |
1069 VFIO_REGION_INFO_FLAG_WRITE;
1070 break;
1071 case VFIO_PCI_BAR0_REGION_INDEX:
1072 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1073 info.size = vgpu->cfg_space.bar[info.index].size;
1074 if (!info.size) {
1075 info.flags = 0;
1076 break;
1077 }
1078
1079 info.flags = VFIO_REGION_INFO_FLAG_READ |
1080 VFIO_REGION_INFO_FLAG_WRITE;
1081 break;
1082 case VFIO_PCI_BAR1_REGION_INDEX:
1083 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1084 info.size = 0;
1085 info.flags = 0;
1086 break;
1087 case VFIO_PCI_BAR2_REGION_INDEX:
1088 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1089 info.flags = VFIO_REGION_INFO_FLAG_CAPS |
1090 VFIO_REGION_INFO_FLAG_MMAP |
1091 VFIO_REGION_INFO_FLAG_READ |
1092 VFIO_REGION_INFO_FLAG_WRITE;
1093 info.size = gvt_aperture_sz(vgpu->gvt);
1094
1095 size = sizeof(*sparse) +
1096 (nr_areas * sizeof(*sparse->areas));
1097 sparse = kzalloc(size, GFP_KERNEL);
1098 if (!sparse)
1099 return -ENOMEM;
1100
1101 sparse->header.id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
1102 sparse->header.version = 1;
1103 sparse->nr_areas = nr_areas;
1104 cap_type_id = VFIO_REGION_INFO_CAP_SPARSE_MMAP;
1105 sparse->areas[0].offset =
1106 PAGE_ALIGN(vgpu_aperture_offset(vgpu));
1107 sparse->areas[0].size = vgpu_aperture_sz(vgpu);
1108 break;
1109
1110 case VFIO_PCI_BAR3_REGION_INDEX ... VFIO_PCI_BAR5_REGION_INDEX:
1111 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1112 info.size = 0;
1113 info.flags = 0;
1114
1115 gvt_dbg_core("get region info bar:%d\n", info.index);
1116 break;
1117
1118 case VFIO_PCI_ROM_REGION_INDEX:
1119 case VFIO_PCI_VGA_REGION_INDEX:
1120 info.offset = VFIO_PCI_INDEX_TO_OFFSET(info.index);
1121 info.size = 0;
1122 info.flags = 0;
1123
1124 gvt_dbg_core("get region info index:%d\n", info.index);
1125 break;
1126 default:
1127 {
1128 struct vfio_region_info_cap_type cap_type = {
1129 .header.id = VFIO_REGION_INFO_CAP_TYPE,
1130 .header.version = 1 };
1131
1132 if (info.index >= VFIO_PCI_NUM_REGIONS +
1133 vgpu->vdev.num_regions)
1134 return -EINVAL;
1135
1136 i = info.index - VFIO_PCI_NUM_REGIONS;
1137
1138 info.offset =
1139 VFIO_PCI_INDEX_TO_OFFSET(info.index);
1140 info.size = vgpu->vdev.region[i].size;
1141 info.flags = vgpu->vdev.region[i].flags;
1142
1143 cap_type.type = vgpu->vdev.region[i].type;
1144 cap_type.subtype = vgpu->vdev.region[i].subtype;
1145
1146 ret = vfio_info_add_capability(&caps,
1147 &cap_type.header,
1148 sizeof(cap_type));
1149 if (ret)
1150 return ret;
1151 }
1152 }
1153
1154 if ((info.flags & VFIO_REGION_INFO_FLAG_CAPS) && sparse) {
1155 switch (cap_type_id) {
1156 case VFIO_REGION_INFO_CAP_SPARSE_MMAP:
1157 ret = vfio_info_add_capability(&caps,
1158 &sparse->header, sizeof(*sparse) +
1159 (sparse->nr_areas *
1160 sizeof(*sparse->areas)));
1161 kfree(sparse);
1162 if (ret)
1163 return ret;
1164 break;
1165 default:
1166 return -EINVAL;
1167 }
1168 }
1169
1170 if (caps.size) {
1171 info.flags |= VFIO_REGION_INFO_FLAG_CAPS;
1172 if (info.argsz < sizeof(info) + caps.size) {
1173 info.argsz = sizeof(info) + caps.size;
1174 info.cap_offset = 0;
1175 } else {
1176 vfio_info_cap_shift(&caps, sizeof(info));
1177 if (copy_to_user((void __user *)arg +
1178 sizeof(info), caps.buf,
1179 caps.size)) {
1180 kfree(caps.buf);
1181 return -EFAULT;
1182 }
1183 info.cap_offset = sizeof(info);
1184 }
1185
1186 kfree(caps.buf);
1187 }
1188
1189 return copy_to_user((void __user *)arg, &info, minsz) ?
1190 -EFAULT : 0;
1191 } else if (cmd == VFIO_DEVICE_GET_IRQ_INFO) {
1192 struct vfio_irq_info info;
1193
1194 minsz = offsetofend(struct vfio_irq_info, count);
1195
1196 if (copy_from_user(&info, (void __user *)arg, minsz))
1197 return -EFAULT;
1198
1199 if (info.argsz < minsz || info.index >= VFIO_PCI_NUM_IRQS)
1200 return -EINVAL;
1201
1202 switch (info.index) {
1203 case VFIO_PCI_INTX_IRQ_INDEX:
1204 case VFIO_PCI_MSI_IRQ_INDEX:
1205 break;
1206 default:
1207 return -EINVAL;
1208 }
1209
1210 info.flags = VFIO_IRQ_INFO_EVENTFD;
1211
1212 info.count = intel_vgpu_get_irq_count(vgpu, info.index);
1213
1214 if (info.index == VFIO_PCI_INTX_IRQ_INDEX)
1215 info.flags |= (VFIO_IRQ_INFO_MASKABLE |
1216 VFIO_IRQ_INFO_AUTOMASKED);
1217 else
1218 info.flags |= VFIO_IRQ_INFO_NORESIZE;
1219
1220 return copy_to_user((void __user *)arg, &info, minsz) ?
1221 -EFAULT : 0;
1222 } else if (cmd == VFIO_DEVICE_SET_IRQS) {
1223 struct vfio_irq_set hdr;
1224 u8 *data = NULL;
1225 int ret = 0;
1226 size_t data_size = 0;
1227
1228 minsz = offsetofend(struct vfio_irq_set, count);
1229
1230 if (copy_from_user(&hdr, (void __user *)arg, minsz))
1231 return -EFAULT;
1232
1233 if (!(hdr.flags & VFIO_IRQ_SET_DATA_NONE)) {
1234 int max = intel_vgpu_get_irq_count(vgpu, hdr.index);
1235
1236 ret = vfio_set_irqs_validate_and_prepare(&hdr, max,
1237 VFIO_PCI_NUM_IRQS, &data_size);
1238 if (ret) {
1239 gvt_vgpu_err("intel:vfio_set_irqs_validate_and_prepare failed\n");
1240 return -EINVAL;
1241 }
1242 if (data_size) {
1243 data = memdup_user((void __user *)(arg + minsz),
1244 data_size);
1245 if (IS_ERR(data))
1246 return PTR_ERR(data);
1247 }
1248 }
1249
1250 ret = intel_vgpu_set_irqs(vgpu, hdr.flags, hdr.index,
1251 hdr.start, hdr.count, data);
1252 kfree(data);
1253
1254 return ret;
1255 } else if (cmd == VFIO_DEVICE_RESET) {
1256 intel_gvt_ops->vgpu_reset(vgpu);
1257 return 0;
1258 } else if (cmd == VFIO_DEVICE_QUERY_GFX_PLANE) {
1259 struct vfio_device_gfx_plane_info dmabuf;
1260 int ret = 0;
1261
1262 minsz = offsetofend(struct vfio_device_gfx_plane_info,
1263 dmabuf_id);
1264 if (copy_from_user(&dmabuf, (void __user *)arg, minsz))
1265 return -EFAULT;
1266 if (dmabuf.argsz < minsz)
1267 return -EINVAL;
1268
1269 ret = intel_gvt_ops->vgpu_query_plane(vgpu, &dmabuf);
1270 if (ret != 0)
1271 return ret;
1272
1273 return copy_to_user((void __user *)arg, &dmabuf, minsz) ?
1274 -EFAULT : 0;
1275 } else if (cmd == VFIO_DEVICE_GET_GFX_DMABUF) {
1276 __u32 dmabuf_id;
1277 __s32 dmabuf_fd;
1278
1279 if (get_user(dmabuf_id, (__u32 __user *)arg))
1280 return -EFAULT;
1281
1282 dmabuf_fd = intel_gvt_ops->vgpu_get_dmabuf(vgpu, dmabuf_id);
1283 return dmabuf_fd;
1284
1285 }
1286
1287 return 0;
1288 }
1289
1290 static ssize_t
1291 vgpu_id_show(struct device *dev, struct device_attribute *attr,
1292 char *buf)
1293 {
1294 struct mdev_device *mdev = mdev_from_dev(dev);
1295
1296 if (mdev) {
1297 struct intel_vgpu *vgpu = (struct intel_vgpu *)
1298 mdev_get_drvdata(mdev);
1299 return sprintf(buf, "%d\n", vgpu->id);
1300 }
1301 return sprintf(buf, "\n");
1302 }
1303
1304 static ssize_t
1305 hw_id_show(struct device *dev, struct device_attribute *attr,
1306 char *buf)
1307 {
1308 struct mdev_device *mdev = mdev_from_dev(dev);
1309
1310 if (mdev) {
1311 struct intel_vgpu *vgpu = (struct intel_vgpu *)
1312 mdev_get_drvdata(mdev);
1313 return sprintf(buf, "%u\n",
1314 vgpu->submission.shadow_ctx->hw_id);
1315 }
1316 return sprintf(buf, "\n");
1317 }
1318
1319 static DEVICE_ATTR_RO(vgpu_id);
1320 static DEVICE_ATTR_RO(hw_id);
1321
1322 static struct attribute *intel_vgpu_attrs[] = {
1323 &dev_attr_vgpu_id.attr,
1324 &dev_attr_hw_id.attr,
1325 NULL
1326 };
1327
1328 static const struct attribute_group intel_vgpu_group = {
1329 .name = "intel_vgpu",
1330 .attrs = intel_vgpu_attrs,
1331 };
1332
1333 static const struct attribute_group *intel_vgpu_groups[] = {
1334 &intel_vgpu_group,
1335 NULL,
1336 };
1337
1338 static struct mdev_parent_ops intel_vgpu_ops = {
1339 .mdev_attr_groups = intel_vgpu_groups,
1340 .create = intel_vgpu_create,
1341 .remove = intel_vgpu_remove,
1342
1343 .open = intel_vgpu_open,
1344 .release = intel_vgpu_release,
1345
1346 .read = intel_vgpu_read,
1347 .write = intel_vgpu_write,
1348 .mmap = intel_vgpu_mmap,
1349 .ioctl = intel_vgpu_ioctl,
1350 };
1351
1352 static int kvmgt_host_init(struct device *dev, void *gvt, const void *ops)
1353 {
1354 struct attribute **kvm_type_attrs;
1355 struct attribute_group **kvm_vgpu_type_groups;
1356
1357 intel_gvt_ops = ops;
1358 if (!intel_gvt_ops->get_gvt_attrs(&kvm_type_attrs,
1359 &kvm_vgpu_type_groups))
1360 return -EFAULT;
1361 intel_vgpu_ops.supported_type_groups = kvm_vgpu_type_groups;
1362
1363 return mdev_register_device(dev, &intel_vgpu_ops);
1364 }
1365
1366 static void kvmgt_host_exit(struct device *dev, void *gvt)
1367 {
1368 mdev_unregister_device(dev);
1369 }
1370
1371 static int kvmgt_write_protect_add(unsigned long handle, u64 gfn)
1372 {
1373 struct kvmgt_guest_info *info;
1374 struct kvm *kvm;
1375 struct kvm_memory_slot *slot;
1376 int idx;
1377
1378 if (!handle_valid(handle))
1379 return -ESRCH;
1380
1381 info = (struct kvmgt_guest_info *)handle;
1382 kvm = info->kvm;
1383
1384 idx = srcu_read_lock(&kvm->srcu);
1385 slot = gfn_to_memslot(kvm, gfn);
1386 if (!slot) {
1387 srcu_read_unlock(&kvm->srcu, idx);
1388 return -EINVAL;
1389 }
1390
1391 spin_lock(&kvm->mmu_lock);
1392
1393 if (kvmgt_gfn_is_write_protected(info, gfn))
1394 goto out;
1395
1396 kvm_slot_page_track_add_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
1397 kvmgt_protect_table_add(info, gfn);
1398
1399 out:
1400 spin_unlock(&kvm->mmu_lock);
1401 srcu_read_unlock(&kvm->srcu, idx);
1402 return 0;
1403 }
1404
1405 static int kvmgt_write_protect_remove(unsigned long handle, u64 gfn)
1406 {
1407 struct kvmgt_guest_info *info;
1408 struct kvm *kvm;
1409 struct kvm_memory_slot *slot;
1410 int idx;
1411
1412 if (!handle_valid(handle))
1413 return 0;
1414
1415 info = (struct kvmgt_guest_info *)handle;
1416 kvm = info->kvm;
1417
1418 idx = srcu_read_lock(&kvm->srcu);
1419 slot = gfn_to_memslot(kvm, gfn);
1420 if (!slot) {
1421 srcu_read_unlock(&kvm->srcu, idx);
1422 return -EINVAL;
1423 }
1424
1425 spin_lock(&kvm->mmu_lock);
1426
1427 if (!kvmgt_gfn_is_write_protected(info, gfn))
1428 goto out;
1429
1430 kvm_slot_page_track_remove_page(kvm, slot, gfn, KVM_PAGE_TRACK_WRITE);
1431 kvmgt_protect_table_del(info, gfn);
1432
1433 out:
1434 spin_unlock(&kvm->mmu_lock);
1435 srcu_read_unlock(&kvm->srcu, idx);
1436 return 0;
1437 }
1438
1439 static void kvmgt_page_track_write(struct kvm_vcpu *vcpu, gpa_t gpa,
1440 const u8 *val, int len,
1441 struct kvm_page_track_notifier_node *node)
1442 {
1443 struct kvmgt_guest_info *info = container_of(node,
1444 struct kvmgt_guest_info, track_node);
1445
1446 if (kvmgt_gfn_is_write_protected(info, gpa_to_gfn(gpa)))
1447 intel_gvt_ops->write_protect_handler(info->vgpu, gpa,
1448 (void *)val, len);
1449 }
1450
1451 static void kvmgt_page_track_flush_slot(struct kvm *kvm,
1452 struct kvm_memory_slot *slot,
1453 struct kvm_page_track_notifier_node *node)
1454 {
1455 int i;
1456 gfn_t gfn;
1457 struct kvmgt_guest_info *info = container_of(node,
1458 struct kvmgt_guest_info, track_node);
1459
1460 spin_lock(&kvm->mmu_lock);
1461 for (i = 0; i < slot->npages; i++) {
1462 gfn = slot->base_gfn + i;
1463 if (kvmgt_gfn_is_write_protected(info, gfn)) {
1464 kvm_slot_page_track_remove_page(kvm, slot, gfn,
1465 KVM_PAGE_TRACK_WRITE);
1466 kvmgt_protect_table_del(info, gfn);
1467 }
1468 }
1469 spin_unlock(&kvm->mmu_lock);
1470 }
1471
1472 static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu, struct kvm *kvm)
1473 {
1474 struct intel_vgpu *itr;
1475 struct kvmgt_guest_info *info;
1476 int id;
1477 bool ret = false;
1478
1479 mutex_lock(&vgpu->gvt->lock);
1480 for_each_active_vgpu(vgpu->gvt, itr, id) {
1481 if (!handle_valid(itr->handle))
1482 continue;
1483
1484 info = (struct kvmgt_guest_info *)itr->handle;
1485 if (kvm && kvm == info->kvm) {
1486 ret = true;
1487 goto out;
1488 }
1489 }
1490 out:
1491 mutex_unlock(&vgpu->gvt->lock);
1492 return ret;
1493 }
1494
1495 static int kvmgt_guest_init(struct mdev_device *mdev)
1496 {
1497 struct kvmgt_guest_info *info;
1498 struct intel_vgpu *vgpu;
1499 struct kvm *kvm;
1500
1501 vgpu = mdev_get_drvdata(mdev);
1502 if (handle_valid(vgpu->handle))
1503 return -EEXIST;
1504
1505 kvm = vgpu->vdev.kvm;
1506 if (!kvm || kvm->mm != current->mm) {
1507 gvt_vgpu_err("KVM is required to use Intel vGPU\n");
1508 return -ESRCH;
1509 }
1510
1511 if (__kvmgt_vgpu_exist(vgpu, kvm))
1512 return -EEXIST;
1513
1514 info = vzalloc(sizeof(struct kvmgt_guest_info));
1515 if (!info)
1516 return -ENOMEM;
1517
1518 vgpu->handle = (unsigned long)info;
1519 info->vgpu = vgpu;
1520 info->kvm = kvm;
1521 kvm_get_kvm(info->kvm);
1522
1523 kvmgt_protect_table_init(info);
1524 gvt_cache_init(vgpu);
1525
1526 mutex_init(&vgpu->dmabuf_lock);
1527 init_completion(&vgpu->vblank_done);
1528
1529 info->track_node.track_write = kvmgt_page_track_write;
1530 info->track_node.track_flush_slot = kvmgt_page_track_flush_slot;
1531 kvm_page_track_register_notifier(kvm, &info->track_node);
1532
1533 return 0;
1534 }
1535
1536 static bool kvmgt_guest_exit(struct kvmgt_guest_info *info)
1537 {
1538 kvm_page_track_unregister_notifier(info->kvm, &info->track_node);
1539 kvm_put_kvm(info->kvm);
1540 kvmgt_protect_table_destroy(info);
1541 gvt_cache_destroy(info->vgpu);
1542 vfree(info);
1543
1544 return true;
1545 }
1546
1547 static int kvmgt_attach_vgpu(void *vgpu, unsigned long *handle)
1548 {
1549 /* nothing to do here */
1550 return 0;
1551 }
1552
1553 static void kvmgt_detach_vgpu(unsigned long handle)
1554 {
1555 /* nothing to do here */
1556 }
1557
1558 static int kvmgt_inject_msi(unsigned long handle, u32 addr, u16 data)
1559 {
1560 struct kvmgt_guest_info *info;
1561 struct intel_vgpu *vgpu;
1562
1563 if (!handle_valid(handle))
1564 return -ESRCH;
1565
1566 info = (struct kvmgt_guest_info *)handle;
1567 vgpu = info->vgpu;
1568
1569 if (eventfd_signal(vgpu->vdev.msi_trigger, 1) == 1)
1570 return 0;
1571
1572 return -EFAULT;
1573 }
1574
1575 static unsigned long kvmgt_gfn_to_pfn(unsigned long handle, unsigned long gfn)
1576 {
1577 unsigned long iova, pfn;
1578 struct kvmgt_guest_info *info;
1579 struct device *dev;
1580 struct intel_vgpu *vgpu;
1581 int rc;
1582
1583 if (!handle_valid(handle))
1584 return INTEL_GVT_INVALID_ADDR;
1585
1586 info = (struct kvmgt_guest_info *)handle;
1587 vgpu = info->vgpu;
1588 iova = gvt_cache_find(info->vgpu, gfn);
1589 if (iova != INTEL_GVT_INVALID_ADDR)
1590 return iova;
1591
1592 pfn = INTEL_GVT_INVALID_ADDR;
1593 dev = mdev_dev(info->vgpu->vdev.mdev);
1594 rc = vfio_pin_pages(dev, &gfn, 1, IOMMU_READ | IOMMU_WRITE, &pfn);
1595 if (rc != 1) {
1596 gvt_vgpu_err("vfio_pin_pages failed for gfn 0x%lx: %d\n",
1597 gfn, rc);
1598 return INTEL_GVT_INVALID_ADDR;
1599 }
1600 /* transfer to host iova for GFX to use DMA */
1601 rc = gvt_dma_map_iova(info->vgpu, pfn, &iova);
1602 if (rc) {
1603 gvt_vgpu_err("gvt_dma_map_iova failed for gfn: 0x%lx\n", gfn);
1604 vfio_unpin_pages(dev, &gfn, 1);
1605 return INTEL_GVT_INVALID_ADDR;
1606 }
1607
1608 gvt_cache_add(info->vgpu, gfn, iova);
1609 return iova;
1610 }
1611
1612 static int kvmgt_rw_gpa(unsigned long handle, unsigned long gpa,
1613 void *buf, unsigned long len, bool write)
1614 {
1615 struct kvmgt_guest_info *info;
1616 struct kvm *kvm;
1617 int idx, ret;
1618 bool kthread = current->mm == NULL;
1619
1620 if (!handle_valid(handle))
1621 return -ESRCH;
1622
1623 info = (struct kvmgt_guest_info *)handle;
1624 kvm = info->kvm;
1625
1626 if (kthread)
1627 use_mm(kvm->mm);
1628
1629 idx = srcu_read_lock(&kvm->srcu);
1630 ret = write ? kvm_write_guest(kvm, gpa, buf, len) :
1631 kvm_read_guest(kvm, gpa, buf, len);
1632 srcu_read_unlock(&kvm->srcu, idx);
1633
1634 if (kthread)
1635 unuse_mm(kvm->mm);
1636
1637 return ret;
1638 }
1639
1640 static int kvmgt_read_gpa(unsigned long handle, unsigned long gpa,
1641 void *buf, unsigned long len)
1642 {
1643 return kvmgt_rw_gpa(handle, gpa, buf, len, false);
1644 }
1645
1646 static int kvmgt_write_gpa(unsigned long handle, unsigned long gpa,
1647 void *buf, unsigned long len)
1648 {
1649 return kvmgt_rw_gpa(handle, gpa, buf, len, true);
1650 }
1651
1652 static unsigned long kvmgt_virt_to_pfn(void *addr)
1653 {
1654 return PFN_DOWN(__pa(addr));
1655 }
1656
1657 static bool kvmgt_is_valid_gfn(unsigned long handle, unsigned long gfn)
1658 {
1659 struct kvmgt_guest_info *info;
1660 struct kvm *kvm;
1661
1662 if (!handle_valid(handle))
1663 return false;
1664
1665 info = (struct kvmgt_guest_info *)handle;
1666 kvm = info->kvm;
1667
1668 return kvm_is_visible_gfn(kvm, gfn);
1669
1670 }
1671
1672 struct intel_gvt_mpt kvmgt_mpt = {
1673 .host_init = kvmgt_host_init,
1674 .host_exit = kvmgt_host_exit,
1675 .attach_vgpu = kvmgt_attach_vgpu,
1676 .detach_vgpu = kvmgt_detach_vgpu,
1677 .inject_msi = kvmgt_inject_msi,
1678 .from_virt_to_mfn = kvmgt_virt_to_pfn,
1679 .set_wp_page = kvmgt_write_protect_add,
1680 .unset_wp_page = kvmgt_write_protect_remove,
1681 .read_gpa = kvmgt_read_gpa,
1682 .write_gpa = kvmgt_write_gpa,
1683 .gfn_to_mfn = kvmgt_gfn_to_pfn,
1684 .set_opregion = kvmgt_set_opregion,
1685 .get_vfio_device = kvmgt_get_vfio_device,
1686 .put_vfio_device = kvmgt_put_vfio_device,
1687 .is_valid_gfn = kvmgt_is_valid_gfn,
1688 };
1689 EXPORT_SYMBOL_GPL(kvmgt_mpt);
1690
1691 static int __init kvmgt_init(void)
1692 {
1693 return 0;
1694 }
1695
1696 static void __exit kvmgt_exit(void)
1697 {
1698 }
1699
1700 module_init(kvmgt_init);
1701 module_exit(kvmgt_exit);
1702
1703 MODULE_LICENSE("GPL and additional rights");
1704 MODULE_AUTHOR("Intel Corporation");
CRIS linux kernel tree