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[linux.git] / drivers / vdpa / octeon_ep / octep_vdpa_main.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (C) 2024 Marvell. */
3
4 #include <linux/interrupt.h>
5 #include <linux/io-64-nonatomic-lo-hi.h>
6 #include <linux/module.h>
7 #include <linux/iommu.h>
8 #include "octep_vdpa.h"
9
10 #define OCTEP_VDPA_DRIVER_NAME "octep_vdpa"
11
12 struct octep_pf {
13         u8 __iomem *base[PCI_STD_NUM_BARS];
14         struct pci_dev *pdev;
15         struct resource res;
16         u64 vf_base;
17         int enabled_vfs;
18         u32 vf_stride;
19         u16 vf_devid;
20 };
21
22 struct octep_vdpa {
23         struct vdpa_device vdpa;
24         struct octep_hw *oct_hw;
25         struct pci_dev *pdev;
26 };
27
28 struct octep_vdpa_mgmt_dev {
29         struct vdpa_mgmt_dev mdev;
30         struct octep_hw oct_hw;
31         struct pci_dev *pdev;
32         /* Work entry to handle device setup */
33         struct work_struct setup_task;
34         /* Device status */
35         atomic_t status;
36 };
37
38 static struct octep_hw *vdpa_to_octep_hw(struct vdpa_device *vdpa_dev)
39 {
40         struct octep_vdpa *oct_vdpa;
41
42         oct_vdpa = container_of(vdpa_dev, struct octep_vdpa, vdpa);
43
44         return oct_vdpa->oct_hw;
45 }
46
47 static irqreturn_t octep_vdpa_intr_handler(int irq, void *data)
48 {
49         struct octep_hw *oct_hw = data;
50         int i;
51
52         for (i = 0; i < oct_hw->nr_vring; i++) {
53                 if (oct_hw->vqs[i].cb.callback && ioread32(oct_hw->vqs[i].cb_notify_addr)) {
54                         /* Acknowledge the per queue notification to the device */
55                         iowrite32(0, oct_hw->vqs[i].cb_notify_addr);
56                         oct_hw->vqs[i].cb.callback(oct_hw->vqs[i].cb.private);
57                 }
58         }
59
60         return IRQ_HANDLED;
61 }
62
63 static void octep_free_irqs(struct octep_hw *oct_hw)
64 {
65         struct pci_dev *pdev = oct_hw->pdev;
66
67         if (oct_hw->irq != -1) {
68                 devm_free_irq(&pdev->dev, oct_hw->irq, oct_hw);
69                 oct_hw->irq = -1;
70         }
71         pci_free_irq_vectors(pdev);
72 }
73
74 static int octep_request_irqs(struct octep_hw *oct_hw)
75 {
76         struct pci_dev *pdev = oct_hw->pdev;
77         int ret, irq;
78
79         /* Currently HW device provisions one IRQ per VF, hence
80          * allocate one IRQ for all virtqueues call interface.
81          */
82         ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSIX);
83         if (ret < 0) {
84                 dev_err(&pdev->dev, "Failed to alloc msix vector");
85                 return ret;
86         }
87
88         snprintf(oct_hw->vqs->msix_name, sizeof(oct_hw->vqs->msix_name),
89                  OCTEP_VDPA_DRIVER_NAME "-vf-%d", pci_iov_vf_id(pdev));
90
91         irq = pci_irq_vector(pdev, 0);
92         ret = devm_request_irq(&pdev->dev, irq, octep_vdpa_intr_handler, 0,
93                                oct_hw->vqs->msix_name, oct_hw);
94         if (ret) {
95                 dev_err(&pdev->dev, "Failed to register interrupt handler\n");
96                 goto free_irq_vec;
97         }
98         oct_hw->irq = irq;
99
100         return 0;
101
102 free_irq_vec:
103         pci_free_irq_vectors(pdev);
104         return ret;
105 }
106
107 static u64 octep_vdpa_get_device_features(struct vdpa_device *vdpa_dev)
108 {
109         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
110
111         return oct_hw->features;
112 }
113
114 static int octep_vdpa_set_driver_features(struct vdpa_device *vdpa_dev, u64 features)
115 {
116         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
117         int ret;
118
119         pr_debug("Driver Features: %llx\n", features);
120
121         ret = octep_verify_features(features);
122         if (ret) {
123                 dev_warn(&oct_hw->pdev->dev,
124                          "Must negotiate minimum features 0x%llx for this device",
125                          BIT_ULL(VIRTIO_F_VERSION_1) | BIT_ULL(VIRTIO_F_NOTIFICATION_DATA) |
126                          BIT_ULL(VIRTIO_F_RING_PACKED));
127                 return ret;
128         }
129         octep_hw_set_drv_features(oct_hw, features);
130
131         return 0;
132 }
133
134 static u64 octep_vdpa_get_driver_features(struct vdpa_device *vdpa_dev)
135 {
136         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
137
138         return octep_hw_get_drv_features(oct_hw);
139 }
140
141 static u8 octep_vdpa_get_status(struct vdpa_device *vdpa_dev)
142 {
143         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
144
145         return octep_hw_get_status(oct_hw);
146 }
147
148 static void octep_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
149 {
150         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
151         u8 status_old;
152
153         status_old = octep_hw_get_status(oct_hw);
154
155         if (status_old == status)
156                 return;
157
158         if ((status & VIRTIO_CONFIG_S_DRIVER_OK) &&
159             !(status_old & VIRTIO_CONFIG_S_DRIVER_OK)) {
160                 if (octep_request_irqs(oct_hw))
161                         status = status_old | VIRTIO_CONFIG_S_FAILED;
162         }
163         octep_hw_set_status(oct_hw, status);
164 }
165
166 static int octep_vdpa_reset(struct vdpa_device *vdpa_dev)
167 {
168         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
169         u8 status = octep_hw_get_status(oct_hw);
170         u16 qid;
171
172         if (status == 0)
173                 return 0;
174
175         for (qid = 0; qid < oct_hw->nr_vring; qid++) {
176                 oct_hw->vqs[qid].cb.callback = NULL;
177                 oct_hw->vqs[qid].cb.private = NULL;
178                 oct_hw->config_cb.callback = NULL;
179                 oct_hw->config_cb.private = NULL;
180         }
181         octep_hw_reset(oct_hw);
182
183         if (status & VIRTIO_CONFIG_S_DRIVER_OK)
184                 octep_free_irqs(oct_hw);
185
186         return 0;
187 }
188
189 static u16 octep_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
190 {
191         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
192
193         return octep_get_vq_size(oct_hw);
194 }
195
196 static int octep_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
197                                    struct vdpa_vq_state *state)
198 {
199         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
200
201         return octep_get_vq_state(oct_hw, qid, state);
202 }
203
204 static int octep_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
205                                    const struct vdpa_vq_state *state)
206 {
207         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
208
209         return octep_set_vq_state(oct_hw, qid, state);
210 }
211
212 static void octep_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid, struct vdpa_callback *cb)
213 {
214         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
215
216         oct_hw->vqs[qid].cb = *cb;
217 }
218
219 static void octep_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev, u16 qid, bool ready)
220 {
221         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
222
223         octep_set_vq_ready(oct_hw, qid, ready);
224 }
225
226 static bool octep_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
227 {
228         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
229
230         return octep_get_vq_ready(oct_hw, qid);
231 }
232
233 static void octep_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid, u32 num)
234 {
235         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
236
237         octep_set_vq_num(oct_hw, qid, num);
238 }
239
240 static int octep_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid, u64 desc_area,
241                                      u64 driver_area, u64 device_area)
242 {
243         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
244
245         pr_debug("qid[%d]: desc_area: %llx\n", qid, desc_area);
246         pr_debug("qid[%d]: driver_area: %llx\n", qid, driver_area);
247         pr_debug("qid[%d]: device_area: %llx\n\n", qid, device_area);
248
249         return octep_set_vq_address(oct_hw, qid, desc_area, driver_area, device_area);
250 }
251
252 static void octep_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
253 {
254         /* Not supported */
255 }
256
257 static void octep_vdpa_kick_vq_with_data(struct vdpa_device *vdpa_dev, u32 data)
258 {
259         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
260         u16 idx = data & 0xFFFF;
261
262         vp_iowrite32(data, oct_hw->vqs[idx].notify_addr);
263 }
264
265 static u32 octep_vdpa_get_generation(struct vdpa_device *vdpa_dev)
266 {
267         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
268
269         return vp_ioread8(&oct_hw->common_cfg->config_generation);
270 }
271
272 static u32 octep_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
273 {
274         return VIRTIO_ID_NET;
275 }
276
277 static u32 octep_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
278 {
279         return PCI_VENDOR_ID_CAVIUM;
280 }
281
282 static u32 octep_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
283 {
284         return PAGE_SIZE;
285 }
286
287 static size_t octep_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
288 {
289         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
290
291         return oct_hw->config_size;
292 }
293
294 static void octep_vdpa_get_config(struct vdpa_device *vdpa_dev, unsigned int offset, void *buf,
295                                   unsigned int len)
296 {
297         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
298
299         octep_read_dev_config(oct_hw, offset, buf, len);
300 }
301
302 static void octep_vdpa_set_config(struct vdpa_device *vdpa_dev, unsigned int offset,
303                                   const void *buf, unsigned int len)
304 {
305         /* Not supported */
306 }
307
308 static void octep_vdpa_set_config_cb(struct vdpa_device *vdpa_dev, struct vdpa_callback *cb)
309 {
310         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
311
312         oct_hw->config_cb.callback = cb->callback;
313         oct_hw->config_cb.private = cb->private;
314 }
315
316 static struct vdpa_notification_area octep_get_vq_notification(struct vdpa_device *vdpa_dev,
317                                                                u16 idx)
318 {
319         struct octep_hw *oct_hw = vdpa_to_octep_hw(vdpa_dev);
320         struct vdpa_notification_area area;
321
322         area.addr = oct_hw->vqs[idx].notify_pa;
323         area.size = PAGE_SIZE;
324
325         return area;
326 }
327
328 static struct vdpa_config_ops octep_vdpa_ops = {
329         .get_device_features = octep_vdpa_get_device_features,
330         .set_driver_features = octep_vdpa_set_driver_features,
331         .get_driver_features = octep_vdpa_get_driver_features,
332         .get_status     = octep_vdpa_get_status,
333         .set_status     = octep_vdpa_set_status,
334         .reset          = octep_vdpa_reset,
335         .get_vq_num_max = octep_vdpa_get_vq_num_max,
336         .get_vq_state   = octep_vdpa_get_vq_state,
337         .set_vq_state   = octep_vdpa_set_vq_state,
338         .set_vq_cb      = octep_vdpa_set_vq_cb,
339         .set_vq_ready   = octep_vdpa_set_vq_ready,
340         .get_vq_ready   = octep_vdpa_get_vq_ready,
341         .set_vq_num     = octep_vdpa_set_vq_num,
342         .set_vq_address = octep_vdpa_set_vq_address,
343         .get_vq_irq     = NULL,
344         .kick_vq        = octep_vdpa_kick_vq,
345         .kick_vq_with_data      = octep_vdpa_kick_vq_with_data,
346         .get_generation = octep_vdpa_get_generation,
347         .get_device_id  = octep_vdpa_get_device_id,
348         .get_vendor_id  = octep_vdpa_get_vendor_id,
349         .get_vq_align   = octep_vdpa_get_vq_align,
350         .get_config_size        = octep_vdpa_get_config_size,
351         .get_config     = octep_vdpa_get_config,
352         .set_config     = octep_vdpa_set_config,
353         .set_config_cb  = octep_vdpa_set_config_cb,
354         .get_vq_notification = octep_get_vq_notification,
355 };
356
357 static int octep_iomap_region(struct pci_dev *pdev, u8 __iomem **tbl, u8 bar)
358 {
359         int ret;
360
361         ret = pci_request_region(pdev, bar, OCTEP_VDPA_DRIVER_NAME);
362         if (ret) {
363                 dev_err(&pdev->dev, "Failed to request BAR:%u region\n", bar);
364                 return ret;
365         }
366
367         tbl[bar] = pci_iomap(pdev, bar, pci_resource_len(pdev, bar));
368         if (!tbl[bar]) {
369                 dev_err(&pdev->dev, "Failed to iomap BAR:%u\n", bar);
370                 pci_release_region(pdev, bar);
371                 ret = -ENOMEM;
372         }
373
374         return ret;
375 }
376
377 static void octep_iounmap_region(struct pci_dev *pdev, u8 __iomem **tbl, u8 bar)
378 {
379         pci_iounmap(pdev, tbl[bar]);
380         pci_release_region(pdev, bar);
381 }
382
383 static void octep_vdpa_pf_bar_shrink(struct octep_pf *octpf)
384 {
385         struct pci_dev *pf_dev = octpf->pdev;
386         struct resource *res = pf_dev->resource + PCI_STD_RESOURCES + 4;
387         struct pci_bus_region bus_region;
388
389         octpf->res.start = res->start;
390         octpf->res.end = res->end;
391         octpf->vf_base = res->start;
392
393         bus_region.start = res->start;
394         bus_region.end = res->start - 1;
395
396         pcibios_bus_to_resource(pf_dev->bus, res, &bus_region);
397 }
398
399 static void octep_vdpa_pf_bar_expand(struct octep_pf *octpf)
400 {
401         struct pci_dev *pf_dev = octpf->pdev;
402         struct resource *res = pf_dev->resource + PCI_STD_RESOURCES + 4;
403         struct pci_bus_region bus_region;
404
405         bus_region.start = octpf->res.start;
406         bus_region.end = octpf->res.end;
407
408         pcibios_bus_to_resource(pf_dev->bus, res, &bus_region);
409 }
410
411 static void octep_vdpa_remove_pf(struct pci_dev *pdev)
412 {
413         struct octep_pf *octpf = pci_get_drvdata(pdev);
414
415         pci_disable_sriov(pdev);
416
417         if (octpf->base[OCTEP_HW_CAPS_BAR])
418                 octep_iounmap_region(pdev, octpf->base, OCTEP_HW_CAPS_BAR);
419
420         if (octpf->base[OCTEP_HW_MBOX_BAR])
421                 octep_iounmap_region(pdev, octpf->base, OCTEP_HW_MBOX_BAR);
422
423         octep_vdpa_pf_bar_expand(octpf);
424 }
425
426 static void octep_vdpa_vf_bar_shrink(struct pci_dev *pdev)
427 {
428         struct resource *vf_res = pdev->resource + PCI_STD_RESOURCES + 4;
429
430         memset(vf_res, 0, sizeof(*vf_res));
431 }
432
433 static void octep_vdpa_remove_vf(struct pci_dev *pdev)
434 {
435         struct octep_vdpa_mgmt_dev *mgmt_dev = pci_get_drvdata(pdev);
436         struct octep_hw *oct_hw;
437         int status;
438
439         oct_hw = &mgmt_dev->oct_hw;
440         status = atomic_read(&mgmt_dev->status);
441         atomic_set(&mgmt_dev->status, OCTEP_VDPA_DEV_STATUS_UNINIT);
442
443         cancel_work_sync(&mgmt_dev->setup_task);
444         if (status == OCTEP_VDPA_DEV_STATUS_READY)
445                 vdpa_mgmtdev_unregister(&mgmt_dev->mdev);
446
447         if (oct_hw->base[OCTEP_HW_CAPS_BAR])
448                 octep_iounmap_region(pdev, oct_hw->base, OCTEP_HW_CAPS_BAR);
449
450         if (oct_hw->base[OCTEP_HW_MBOX_BAR])
451                 octep_iounmap_region(pdev, oct_hw->base, OCTEP_HW_MBOX_BAR);
452
453         octep_vdpa_vf_bar_shrink(pdev);
454 }
455
456 static void octep_vdpa_remove(struct pci_dev *pdev)
457 {
458         if (pdev->is_virtfn)
459                 octep_vdpa_remove_vf(pdev);
460         else
461                 octep_vdpa_remove_pf(pdev);
462 }
463
464 static int octep_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
465                               const struct vdpa_dev_set_config *config)
466 {
467         struct octep_vdpa_mgmt_dev *mgmt_dev = container_of(mdev, struct octep_vdpa_mgmt_dev, mdev);
468         struct octep_hw *oct_hw = &mgmt_dev->oct_hw;
469         struct pci_dev *pdev = oct_hw->pdev;
470         struct vdpa_device *vdpa_dev;
471         struct octep_vdpa *oct_vdpa;
472         u64 device_features;
473         int ret;
474
475         oct_vdpa = vdpa_alloc_device(struct octep_vdpa, vdpa, &pdev->dev, &octep_vdpa_ops, 1, 1,
476                                      NULL, false);
477         if (IS_ERR(oct_vdpa)) {
478                 dev_err(&pdev->dev, "Failed to allocate vDPA structure for octep vdpa device");
479                 return PTR_ERR(oct_vdpa);
480         }
481
482         oct_vdpa->pdev = pdev;
483         oct_vdpa->vdpa.dma_dev = &pdev->dev;
484         oct_vdpa->vdpa.mdev = mdev;
485         oct_vdpa->oct_hw = oct_hw;
486         vdpa_dev = &oct_vdpa->vdpa;
487
488         device_features = oct_hw->features;
489         if (config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
490                 if (config->device_features & ~device_features) {
491                         dev_err(&pdev->dev, "The provisioned features 0x%llx are not supported by this device with features 0x%llx\n",
492                                 config->device_features, device_features);
493                         ret = -EINVAL;
494                         goto vdpa_dev_put;
495                 }
496                 device_features &= config->device_features;
497         }
498
499         oct_hw->features = device_features;
500         dev_info(&pdev->dev, "Vdpa management device features : %llx\n", device_features);
501
502         ret = octep_verify_features(device_features);
503         if (ret) {
504                 dev_warn(mdev->device,
505                          "Must provision minimum features 0x%llx for this device",
506                          BIT_ULL(VIRTIO_F_VERSION_1) | BIT_ULL(VIRTIO_F_ACCESS_PLATFORM) |
507                          BIT_ULL(VIRTIO_F_NOTIFICATION_DATA) | BIT_ULL(VIRTIO_F_RING_PACKED));
508                 goto vdpa_dev_put;
509         }
510         if (name)
511                 ret = dev_set_name(&vdpa_dev->dev, "%s", name);
512         else
513                 ret = dev_set_name(&vdpa_dev->dev, "vdpa%u", vdpa_dev->index);
514
515         ret = _vdpa_register_device(&oct_vdpa->vdpa, oct_hw->nr_vring);
516         if (ret) {
517                 dev_err(&pdev->dev, "Failed to register to vDPA bus");
518                 goto vdpa_dev_put;
519         }
520         return 0;
521
522 vdpa_dev_put:
523         put_device(&oct_vdpa->vdpa.dev);
524         return ret;
525 }
526
527 static void octep_vdpa_dev_del(struct vdpa_mgmt_dev *mdev, struct vdpa_device *vdpa_dev)
528 {
529         _vdpa_unregister_device(vdpa_dev);
530 }
531
532 static const struct vdpa_mgmtdev_ops octep_vdpa_mgmt_dev_ops = {
533         .dev_add = octep_vdpa_dev_add,
534         .dev_del = octep_vdpa_dev_del
535 };
536
537 static bool get_device_ready_status(u8 __iomem *addr)
538 {
539         u64 signature = readq(addr + OCTEP_VF_MBOX_DATA(0));
540
541         if (signature == OCTEP_DEV_READY_SIGNATURE) {
542                 writeq(0, addr + OCTEP_VF_MBOX_DATA(0));
543                 return true;
544         }
545
546         return false;
547 }
548
549 static struct virtio_device_id id_table[] = {
550         { VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID },
551         { 0 },
552 };
553
554 static void octep_vdpa_setup_task(struct work_struct *work)
555 {
556         struct octep_vdpa_mgmt_dev *mgmt_dev = container_of(work, struct octep_vdpa_mgmt_dev,
557                                                             setup_task);
558         struct pci_dev *pdev = mgmt_dev->pdev;
559         struct device *dev = &pdev->dev;
560         struct octep_hw *oct_hw;
561         unsigned long timeout;
562         int ret;
563
564         oct_hw = &mgmt_dev->oct_hw;
565
566         atomic_set(&mgmt_dev->status, OCTEP_VDPA_DEV_STATUS_WAIT_FOR_BAR_INIT);
567
568         /* Wait for a maximum of 5 sec */
569         timeout = jiffies + msecs_to_jiffies(5000);
570         while (!time_after(jiffies, timeout)) {
571                 if (get_device_ready_status(oct_hw->base[OCTEP_HW_MBOX_BAR])) {
572                         atomic_set(&mgmt_dev->status, OCTEP_VDPA_DEV_STATUS_INIT);
573                         break;
574                 }
575
576                 if (atomic_read(&mgmt_dev->status) >= OCTEP_VDPA_DEV_STATUS_READY) {
577                         dev_info(dev, "Stopping vDPA setup task.\n");
578                         return;
579                 }
580
581                 usleep_range(1000, 1500);
582         }
583
584         if (atomic_read(&mgmt_dev->status) != OCTEP_VDPA_DEV_STATUS_INIT) {
585                 dev_err(dev, "BAR initialization is timed out\n");
586                 return;
587         }
588
589         ret = octep_iomap_region(pdev, oct_hw->base, OCTEP_HW_CAPS_BAR);
590         if (ret)
591                 return;
592
593         ret = octep_hw_caps_read(oct_hw, pdev);
594         if (ret < 0)
595                 goto unmap_region;
596
597         mgmt_dev->mdev.ops = &octep_vdpa_mgmt_dev_ops;
598         mgmt_dev->mdev.id_table = id_table;
599         mgmt_dev->mdev.max_supported_vqs = oct_hw->nr_vring;
600         mgmt_dev->mdev.supported_features = oct_hw->features;
601         mgmt_dev->mdev.config_attr_mask = (1 << VDPA_ATTR_DEV_FEATURES);
602         mgmt_dev->mdev.device = dev;
603
604         ret = vdpa_mgmtdev_register(&mgmt_dev->mdev);
605         if (ret) {
606                 dev_err(dev, "Failed to register vdpa management interface\n");
607                 goto unmap_region;
608         }
609
610         atomic_set(&mgmt_dev->status, OCTEP_VDPA_DEV_STATUS_READY);
611
612         return;
613
614 unmap_region:
615         octep_iounmap_region(pdev, oct_hw->base, OCTEP_HW_CAPS_BAR);
616         oct_hw->base[OCTEP_HW_CAPS_BAR] = NULL;
617 }
618
619 static int octep_vdpa_probe_vf(struct pci_dev *pdev)
620 {
621         struct octep_vdpa_mgmt_dev *mgmt_dev;
622         struct device *dev = &pdev->dev;
623         int ret;
624
625         ret = pcim_enable_device(pdev);
626         if (ret) {
627                 dev_err(dev, "Failed to enable device\n");
628                 return ret;
629         }
630
631         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
632         if (ret) {
633                 dev_err(dev, "No usable DMA configuration\n");
634                 return ret;
635         }
636         pci_set_master(pdev);
637
638         mgmt_dev = devm_kzalloc(dev, sizeof(struct octep_vdpa_mgmt_dev), GFP_KERNEL);
639         if (!mgmt_dev)
640                 return -ENOMEM;
641
642         ret = octep_iomap_region(pdev, mgmt_dev->oct_hw.base, OCTEP_HW_MBOX_BAR);
643         if (ret)
644                 return ret;
645
646         mgmt_dev->pdev = pdev;
647         pci_set_drvdata(pdev, mgmt_dev);
648
649         atomic_set(&mgmt_dev->status, OCTEP_VDPA_DEV_STATUS_ALLOC);
650         INIT_WORK(&mgmt_dev->setup_task, octep_vdpa_setup_task);
651         schedule_work(&mgmt_dev->setup_task);
652         dev_info(&pdev->dev, "octep vdpa mgmt device setup task is queued\n");
653
654         return 0;
655 }
656
657 static void octep_vdpa_assign_barspace(struct pci_dev *vf_dev, struct pci_dev *pf_dev, u8 idx)
658 {
659         struct resource *vf_res = vf_dev->resource + PCI_STD_RESOURCES + 4;
660         struct resource *pf_res = pf_dev->resource + PCI_STD_RESOURCES + 4;
661         struct octep_pf *pf = pci_get_drvdata(pf_dev);
662         struct pci_bus_region bus_region;
663
664         vf_res->name = pci_name(vf_dev);
665         vf_res->flags = pf_res->flags;
666         vf_res->parent = (pf_dev->resource + PCI_STD_RESOURCES)->parent;
667
668         bus_region.start = pf->vf_base + idx * pf->vf_stride;
669         bus_region.end = bus_region.start + pf->vf_stride - 1;
670         pcibios_bus_to_resource(vf_dev->bus, vf_res, &bus_region);
671 }
672
673 static int octep_sriov_enable(struct pci_dev *pdev, int num_vfs)
674 {
675         struct octep_pf *pf = pci_get_drvdata(pdev);
676         u8 __iomem *addr = pf->base[OCTEP_HW_MBOX_BAR];
677         struct pci_dev *vf_pdev = NULL;
678         bool done = false;
679         int index = 0;
680         int ret, i;
681
682         ret = pci_enable_sriov(pdev, num_vfs);
683         if (ret)
684                 return ret;
685
686         pf->enabled_vfs = num_vfs;
687
688         while ((vf_pdev = pci_get_device(PCI_VENDOR_ID_CAVIUM, PCI_ANY_ID, vf_pdev))) {
689                 if (vf_pdev->device != pf->vf_devid)
690                         continue;
691
692                 octep_vdpa_assign_barspace(vf_pdev, pdev, index);
693                 if (++index == num_vfs) {
694                         done = true;
695                         break;
696                 }
697         }
698
699         if (done) {
700                 for (i = 0; i < pf->enabled_vfs; i++)
701                         writeq(OCTEP_DEV_READY_SIGNATURE, addr + OCTEP_PF_MBOX_DATA(i));
702         }
703
704         return num_vfs;
705 }
706
707 static int octep_sriov_disable(struct pci_dev *pdev)
708 {
709         struct octep_pf *pf = pci_get_drvdata(pdev);
710
711         if (!pci_num_vf(pdev))
712                 return 0;
713
714         pci_disable_sriov(pdev);
715         pf->enabled_vfs = 0;
716
717         return 0;
718 }
719
720 static int octep_vdpa_sriov_configure(struct pci_dev *pdev, int num_vfs)
721 {
722         if (num_vfs > 0)
723                 return octep_sriov_enable(pdev, num_vfs);
724         else
725                 return octep_sriov_disable(pdev);
726 }
727
728 static u16 octep_get_vf_devid(struct pci_dev *pdev)
729 {
730         u16 did;
731
732         switch (pdev->device) {
733         case OCTEP_VDPA_DEVID_CN106K_PF:
734                 did = OCTEP_VDPA_DEVID_CN106K_VF;
735                 break;
736         case OCTEP_VDPA_DEVID_CN105K_PF:
737                 did = OCTEP_VDPA_DEVID_CN105K_VF;
738                 break;
739         case OCTEP_VDPA_DEVID_CN103K_PF:
740                 did = OCTEP_VDPA_DEVID_CN103K_VF;
741                 break;
742         default:
743                 did = 0xFFFF;
744                 break;
745         }
746
747         return did;
748 }
749
750 static int octep_vdpa_pf_setup(struct octep_pf *octpf)
751 {
752         u8 __iomem *addr = octpf->base[OCTEP_HW_MBOX_BAR];
753         struct pci_dev *pdev = octpf->pdev;
754         int totalvfs;
755         size_t len;
756         u64 val;
757
758         totalvfs = pci_sriov_get_totalvfs(pdev);
759         if (unlikely(!totalvfs)) {
760                 dev_info(&pdev->dev, "Total VFs are %d in PF sriov configuration\n", totalvfs);
761                 return 0;
762         }
763
764         addr = octpf->base[OCTEP_HW_MBOX_BAR];
765         val = readq(addr + OCTEP_EPF_RINFO(0));
766         if (val == 0) {
767                 dev_err(&pdev->dev, "Invalid device configuration\n");
768                 return -EINVAL;
769         }
770
771         if (OCTEP_EPF_RINFO_RPVF(val) != BIT_ULL(0)) {
772                 val &= ~GENMASK_ULL(35, 32);
773                 val |= BIT_ULL(32);
774                 writeq(val, addr + OCTEP_EPF_RINFO(0));
775         }
776
777         len = pci_resource_len(pdev, OCTEP_HW_CAPS_BAR);
778
779         octpf->vf_stride = len / totalvfs;
780         octpf->vf_devid = octep_get_vf_devid(pdev);
781
782         octep_vdpa_pf_bar_shrink(octpf);
783
784         return 0;
785 }
786
787 static int octep_vdpa_probe_pf(struct pci_dev *pdev)
788 {
789         struct device *dev = &pdev->dev;
790         struct octep_pf *octpf;
791         int ret;
792
793         ret = pcim_enable_device(pdev);
794         if (ret) {
795                 dev_err(dev, "Failed to enable device\n");
796                 return ret;
797         }
798
799         ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
800         if (ret) {
801                 dev_err(dev, "No usable DMA configuration\n");
802                 return ret;
803         }
804         octpf = devm_kzalloc(dev, sizeof(*octpf), GFP_KERNEL);
805         if (!octpf)
806                 return -ENOMEM;
807
808         ret = octep_iomap_region(pdev, octpf->base, OCTEP_HW_MBOX_BAR);
809         if (ret)
810                 return ret;
811
812         pci_set_master(pdev);
813         pci_set_drvdata(pdev, octpf);
814         octpf->pdev = pdev;
815
816         ret = octep_vdpa_pf_setup(octpf);
817         if (ret)
818                 goto unmap_region;
819
820         return 0;
821
822 unmap_region:
823         octep_iounmap_region(pdev, octpf->base, OCTEP_HW_MBOX_BAR);
824         return ret;
825 }
826
827 static int octep_vdpa_probe(struct pci_dev *pdev, const struct pci_device_id *id)
828 {
829         if (pdev->is_virtfn)
830                 return octep_vdpa_probe_vf(pdev);
831         else
832                 return octep_vdpa_probe_pf(pdev);
833 }
834
835 static struct pci_device_id octep_pci_vdpa_map[] = {
836         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_VDPA_DEVID_CN106K_PF) },
837         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_VDPA_DEVID_CN106K_VF) },
838         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_VDPA_DEVID_CN105K_PF) },
839         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_VDPA_DEVID_CN105K_VF) },
840         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_VDPA_DEVID_CN103K_PF) },
841         { PCI_DEVICE(PCI_VENDOR_ID_CAVIUM, OCTEP_VDPA_DEVID_CN103K_VF) },
842         { 0 },
843 };
844
845 static struct pci_driver octep_pci_vdpa = {
846         .name     = OCTEP_VDPA_DRIVER_NAME,
847         .id_table = octep_pci_vdpa_map,
848         .probe    = octep_vdpa_probe,
849         .remove   = octep_vdpa_remove,
850         .sriov_configure = octep_vdpa_sriov_configure
851 };
852
853 module_pci_driver(octep_pci_vdpa);
854
855 MODULE_AUTHOR("Marvell");
856 MODULE_DESCRIPTION("Marvell Octeon PCIe endpoint vDPA driver");
857 MODULE_LICENSE("GPL");
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