1 // SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
2 /*
3  * Copyright 2018-2020 Amazon.com, Inc. or its affiliates. All rights reserved.
4  */
5 
6 #include <linux/module.h>
7 #include <linux/pci.h>
8 #include <linux/utsname.h>
9 #include <linux/version.h>
10 
11 #include <rdma/ib_user_verbs.h>
12 
13 #include "efa.h"
14 
15 #define PCI_DEV_ID_EFA0_VF 0xefa0
16 #define PCI_DEV_ID_EFA1_VF 0xefa1
17 
18 static const struct pci_device_id efa_pci_tbl[] = {
19 	{ PCI_VDEVICE(AMAZON, PCI_DEV_ID_EFA0_VF) },
20 	{ PCI_VDEVICE(AMAZON, PCI_DEV_ID_EFA1_VF) },
21 	{ }
22 };
23 
24 MODULE_AUTHOR("Amazon.com, Inc. or its affiliates");
25 MODULE_LICENSE("Dual BSD/GPL");
26 MODULE_DESCRIPTION(DEVICE_NAME);
27 MODULE_DEVICE_TABLE(pci, efa_pci_tbl);
28 
29 #define EFA_REG_BAR 0
30 #define EFA_MEM_BAR 2
31 #define EFA_BASE_BAR_MASK (BIT(EFA_REG_BAR) | BIT(EFA_MEM_BAR))
32 
33 #define EFA_AENQ_ENABLED_GROUPS \
34 	(BIT(EFA_ADMIN_FATAL_ERROR) | BIT(EFA_ADMIN_WARNING) | \
35 	 BIT(EFA_ADMIN_NOTIFICATION) | BIT(EFA_ADMIN_KEEP_ALIVE))
36 
37 /* This handler will called for unknown event group or unimplemented handlers */
38 static void unimplemented_aenq_handler(void *data,
39 				       struct efa_admin_aenq_entry *aenq_e)
40 {
41 	struct efa_dev *dev = (struct efa_dev *)data;
42 
43 	ibdev_err(&dev->ibdev,
44 		  "Unknown event was received or event with unimplemented handler\n");
45 }
46 
47 static void efa_keep_alive(void *data, struct efa_admin_aenq_entry *aenq_e)
48 {
49 	struct efa_dev *dev = (struct efa_dev *)data;
50 
51 	atomic64_inc(&dev->stats.keep_alive_rcvd);
52 }
53 
54 static struct efa_aenq_handlers aenq_handlers = {
55 	.handlers = {
56 		[EFA_ADMIN_KEEP_ALIVE] = efa_keep_alive,
57 	},
58 	.unimplemented_handler = unimplemented_aenq_handler
59 };
60 
61 static void efa_release_bars(struct efa_dev *dev, int bars_mask)
62 {
63 	struct pci_dev *pdev = dev->pdev;
64 	int release_bars;
65 
66 	release_bars = pci_select_bars(pdev, IORESOURCE_MEM) & bars_mask;
67 	pci_release_selected_regions(pdev, release_bars);
68 }
69 
70 static irqreturn_t efa_intr_msix_mgmnt(int irq, void *data)
71 {
72 	struct efa_dev *dev = data;
73 
74 	efa_com_admin_q_comp_intr_handler(&dev->edev);
75 	efa_com_aenq_intr_handler(&dev->edev, data);
76 
77 	return IRQ_HANDLED;
78 }
79 
80 static int efa_request_mgmnt_irq(struct efa_dev *dev)
81 {
82 	struct efa_irq *irq;
83 	int err;
84 
85 	irq = &dev->admin_irq;
86 	err = request_irq(irq->vector, irq->handler, 0, irq->name,
87 			  irq->data);
88 	if (err) {
89 		dev_err(&dev->pdev->dev, "Failed to request admin irq (%d)\n",
90 			err);
91 		return err;
92 	}
93 
94 	dev_dbg(&dev->pdev->dev, "Set affinity hint of mgmnt irq to %*pbl (irq vector: %d)\n",
95 		nr_cpumask_bits, &irq->affinity_hint_mask, irq->vector);
96 	irq_set_affinity_hint(irq->vector, &irq->affinity_hint_mask);
97 
98 	return 0;
99 }
100 
101 static void efa_setup_mgmnt_irq(struct efa_dev *dev)
102 {
103 	u32 cpu;
104 
105 	snprintf(dev->admin_irq.name, EFA_IRQNAME_SIZE,
106 		 "efa-mgmnt@pci:%s", pci_name(dev->pdev));
107 	dev->admin_irq.handler = efa_intr_msix_mgmnt;
108 	dev->admin_irq.data = dev;
109 	dev->admin_irq.vector =
110 		pci_irq_vector(dev->pdev, dev->admin_msix_vector_idx);
111 	cpu = cpumask_first(cpu_online_mask);
112 	dev->admin_irq.cpu = cpu;
113 	cpumask_set_cpu(cpu,
114 			&dev->admin_irq.affinity_hint_mask);
115 	dev_info(&dev->pdev->dev, "Setup irq:0x%p vector:%d name:%s\n",
116 		 &dev->admin_irq,
117 		 dev->admin_irq.vector,
118 		 dev->admin_irq.name);
119 }
120 
121 static void efa_free_mgmnt_irq(struct efa_dev *dev)
122 {
123 	struct efa_irq *irq;
124 
125 	irq = &dev->admin_irq;
126 	irq_set_affinity_hint(irq->vector, NULL);
127 	free_irq(irq->vector, irq->data);
128 }
129 
130 static int efa_set_mgmnt_irq(struct efa_dev *dev)
131 {
132 	efa_setup_mgmnt_irq(dev);
133 
134 	return efa_request_mgmnt_irq(dev);
135 }
136 
137 static int efa_request_doorbell_bar(struct efa_dev *dev)
138 {
139 	u8 db_bar_idx = dev->dev_attr.db_bar;
140 	struct pci_dev *pdev = dev->pdev;
141 	int bars;
142 	int err;
143 
144 	if (!(BIT(db_bar_idx) & EFA_BASE_BAR_MASK)) {
145 		bars = pci_select_bars(pdev, IORESOURCE_MEM) & BIT(db_bar_idx);
146 
147 		err = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
148 		if (err) {
149 			dev_err(&dev->pdev->dev,
150 				"pci_request_selected_regions for bar %d failed %d\n",
151 				db_bar_idx, err);
152 			return err;
153 		}
154 	}
155 
156 	dev->db_bar_addr = pci_resource_start(dev->pdev, db_bar_idx);
157 	dev->db_bar_len = pci_resource_len(dev->pdev, db_bar_idx);
158 
159 	return 0;
160 }
161 
162 static void efa_release_doorbell_bar(struct efa_dev *dev)
163 {
164 	if (!(BIT(dev->dev_attr.db_bar) & EFA_BASE_BAR_MASK))
165 		efa_release_bars(dev, BIT(dev->dev_attr.db_bar));
166 }
167 
168 static void efa_update_hw_hints(struct efa_dev *dev,
169 				struct efa_com_get_hw_hints_result *hw_hints)
170 {
171 	struct efa_com_dev *edev = &dev->edev;
172 
173 	if (hw_hints->mmio_read_timeout)
174 		edev->mmio_read.mmio_read_timeout =
175 			hw_hints->mmio_read_timeout * 1000;
176 
177 	if (hw_hints->poll_interval)
178 		edev->aq.poll_interval = hw_hints->poll_interval;
179 
180 	if (hw_hints->admin_completion_timeout)
181 		edev->aq.completion_timeout =
182 			hw_hints->admin_completion_timeout;
183 }
184 
185 static void efa_stats_init(struct efa_dev *dev)
186 {
187 	atomic64_t *s = (atomic64_t *)&dev->stats;
188 	int i;
189 
190 	for (i = 0; i < sizeof(dev->stats) / sizeof(*s); i++, s++)
191 		atomic64_set(s, 0);
192 }
193 
194 static void efa_set_host_info(struct efa_dev *dev)
195 {
196 	struct efa_admin_set_feature_resp resp = {};
197 	struct efa_admin_set_feature_cmd cmd = {};
198 	struct efa_admin_host_info *hinf;
199 	u32 bufsz = sizeof(*hinf);
200 	dma_addr_t hinf_dma;
201 
202 	if (!efa_com_check_supported_feature_id(&dev->edev,
203 						EFA_ADMIN_HOST_INFO))
204 		return;
205 
206 	/* Failures in host info set shall not disturb probe */
207 	hinf = dma_alloc_coherent(&dev->pdev->dev, bufsz, &hinf_dma,
208 				  GFP_KERNEL);
209 	if (!hinf)
210 		return;
211 
212 	strlcpy(hinf->os_dist_str, utsname()->release,
213 		min(sizeof(hinf->os_dist_str), sizeof(utsname()->release)));
214 	hinf->os_type = EFA_ADMIN_OS_LINUX;
215 	strlcpy(hinf->kernel_ver_str, utsname()->version,
216 		min(sizeof(hinf->kernel_ver_str), sizeof(utsname()->version)));
217 	hinf->kernel_ver = LINUX_VERSION_CODE;
218 	EFA_SET(&hinf->driver_ver, EFA_ADMIN_HOST_INFO_DRIVER_MAJOR, 0);
219 	EFA_SET(&hinf->driver_ver, EFA_ADMIN_HOST_INFO_DRIVER_MINOR, 0);
220 	EFA_SET(&hinf->driver_ver, EFA_ADMIN_HOST_INFO_DRIVER_SUB_MINOR, 0);
221 	EFA_SET(&hinf->driver_ver, EFA_ADMIN_HOST_INFO_DRIVER_MODULE_TYPE, 0);
222 	EFA_SET(&hinf->bdf, EFA_ADMIN_HOST_INFO_BUS, dev->pdev->bus->number);
223 	EFA_SET(&hinf->bdf, EFA_ADMIN_HOST_INFO_DEVICE,
224 		PCI_SLOT(dev->pdev->devfn));
225 	EFA_SET(&hinf->bdf, EFA_ADMIN_HOST_INFO_FUNCTION,
226 		PCI_FUNC(dev->pdev->devfn));
227 	EFA_SET(&hinf->spec_ver, EFA_ADMIN_HOST_INFO_SPEC_MAJOR,
228 		EFA_COMMON_SPEC_VERSION_MAJOR);
229 	EFA_SET(&hinf->spec_ver, EFA_ADMIN_HOST_INFO_SPEC_MINOR,
230 		EFA_COMMON_SPEC_VERSION_MINOR);
231 	EFA_SET(&hinf->flags, EFA_ADMIN_HOST_INFO_INTREE, 1);
232 	EFA_SET(&hinf->flags, EFA_ADMIN_HOST_INFO_GDR, 0);
233 
234 	efa_com_set_feature_ex(&dev->edev, &resp, &cmd, EFA_ADMIN_HOST_INFO,
235 			       hinf_dma, bufsz);
236 
237 	dma_free_coherent(&dev->pdev->dev, bufsz, hinf, hinf_dma);
238 }
239 
240 static const struct ib_device_ops efa_dev_ops = {
241 	.owner = THIS_MODULE,
242 	.driver_id = RDMA_DRIVER_EFA,
243 	.uverbs_abi_ver = EFA_UVERBS_ABI_VERSION,
244 
245 	.alloc_hw_stats = efa_alloc_hw_stats,
246 	.alloc_pd = efa_alloc_pd,
247 	.alloc_ucontext = efa_alloc_ucontext,
248 	.create_ah = efa_create_ah,
249 	.create_cq = efa_create_cq,
250 	.create_qp = efa_create_qp,
251 	.dealloc_pd = efa_dealloc_pd,
252 	.dealloc_ucontext = efa_dealloc_ucontext,
253 	.dereg_mr = efa_dereg_mr,
254 	.destroy_ah = efa_destroy_ah,
255 	.destroy_cq = efa_destroy_cq,
256 	.destroy_qp = efa_destroy_qp,
257 	.get_hw_stats = efa_get_hw_stats,
258 	.get_link_layer = efa_port_link_layer,
259 	.get_port_immutable = efa_get_port_immutable,
260 	.mmap = efa_mmap,
261 	.mmap_free = efa_mmap_free,
262 	.modify_qp = efa_modify_qp,
263 	.query_device = efa_query_device,
264 	.query_gid = efa_query_gid,
265 	.query_pkey = efa_query_pkey,
266 	.query_port = efa_query_port,
267 	.query_qp = efa_query_qp,
268 	.reg_user_mr = efa_reg_mr,
269 
270 	INIT_RDMA_OBJ_SIZE(ib_ah, efa_ah, ibah),
271 	INIT_RDMA_OBJ_SIZE(ib_cq, efa_cq, ibcq),
272 	INIT_RDMA_OBJ_SIZE(ib_pd, efa_pd, ibpd),
273 	INIT_RDMA_OBJ_SIZE(ib_ucontext, efa_ucontext, ibucontext),
274 };
275 
276 static int efa_ib_device_add(struct efa_dev *dev)
277 {
278 	struct efa_com_get_hw_hints_result hw_hints;
279 	struct pci_dev *pdev = dev->pdev;
280 	int err;
281 
282 	efa_stats_init(dev);
283 
284 	err = efa_com_get_device_attr(&dev->edev, &dev->dev_attr);
285 	if (err)
286 		return err;
287 
288 	dev_dbg(&dev->pdev->dev, "Doorbells bar (%d)\n", dev->dev_attr.db_bar);
289 	err = efa_request_doorbell_bar(dev);
290 	if (err)
291 		return err;
292 
293 	err = efa_com_get_hw_hints(&dev->edev, &hw_hints);
294 	if (err)
295 		goto err_release_doorbell_bar;
296 
297 	efa_update_hw_hints(dev, &hw_hints);
298 
299 	/* Try to enable all the available aenq groups */
300 	err = efa_com_set_aenq_config(&dev->edev, EFA_AENQ_ENABLED_GROUPS);
301 	if (err)
302 		goto err_release_doorbell_bar;
303 
304 	efa_set_host_info(dev);
305 
306 	dev->ibdev.node_type = RDMA_NODE_UNSPECIFIED;
307 	dev->ibdev.phys_port_cnt = 1;
308 	dev->ibdev.num_comp_vectors = 1;
309 	dev->ibdev.dev.parent = &pdev->dev;
310 
311 	dev->ibdev.uverbs_cmd_mask =
312 		(1ull << IB_USER_VERBS_CMD_GET_CONTEXT) |
313 		(1ull << IB_USER_VERBS_CMD_QUERY_DEVICE) |
314 		(1ull << IB_USER_VERBS_CMD_QUERY_PORT) |
315 		(1ull << IB_USER_VERBS_CMD_ALLOC_PD) |
316 		(1ull << IB_USER_VERBS_CMD_DEALLOC_PD) |
317 		(1ull << IB_USER_VERBS_CMD_REG_MR) |
318 		(1ull << IB_USER_VERBS_CMD_DEREG_MR) |
319 		(1ull << IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL) |
320 		(1ull << IB_USER_VERBS_CMD_CREATE_CQ) |
321 		(1ull << IB_USER_VERBS_CMD_DESTROY_CQ) |
322 		(1ull << IB_USER_VERBS_CMD_CREATE_QP) |
323 		(1ull << IB_USER_VERBS_CMD_MODIFY_QP) |
324 		(1ull << IB_USER_VERBS_CMD_QUERY_QP) |
325 		(1ull << IB_USER_VERBS_CMD_DESTROY_QP) |
326 		(1ull << IB_USER_VERBS_CMD_CREATE_AH) |
327 		(1ull << IB_USER_VERBS_CMD_DESTROY_AH);
328 
329 	dev->ibdev.uverbs_ex_cmd_mask =
330 		(1ull << IB_USER_VERBS_EX_CMD_QUERY_DEVICE);
331 
332 	ib_set_device_ops(&dev->ibdev, &efa_dev_ops);
333 
334 	err = ib_register_device(&dev->ibdev, "efa_%d", &pdev->dev);
335 	if (err)
336 		goto err_release_doorbell_bar;
337 
338 	ibdev_info(&dev->ibdev, "IB device registered\n");
339 
340 	return 0;
341 
342 err_release_doorbell_bar:
343 	efa_release_doorbell_bar(dev);
344 	return err;
345 }
346 
347 static void efa_ib_device_remove(struct efa_dev *dev)
348 {
349 	efa_com_dev_reset(&dev->edev, EFA_REGS_RESET_NORMAL);
350 	ibdev_info(&dev->ibdev, "Unregister ib device\n");
351 	ib_unregister_device(&dev->ibdev);
352 	efa_release_doorbell_bar(dev);
353 }
354 
355 static void efa_disable_msix(struct efa_dev *dev)
356 {
357 	pci_free_irq_vectors(dev->pdev);
358 }
359 
360 static int efa_enable_msix(struct efa_dev *dev)
361 {
362 	int msix_vecs, irq_num;
363 
364 	/* Reserve the max msix vectors we might need */
365 	msix_vecs = EFA_NUM_MSIX_VEC;
366 	dev_dbg(&dev->pdev->dev, "Trying to enable MSI-X, vectors %d\n",
367 		msix_vecs);
368 
369 	dev->admin_msix_vector_idx = EFA_MGMNT_MSIX_VEC_IDX;
370 	irq_num = pci_alloc_irq_vectors(dev->pdev, msix_vecs,
371 					msix_vecs, PCI_IRQ_MSIX);
372 
373 	if (irq_num < 0) {
374 		dev_err(&dev->pdev->dev, "Failed to enable MSI-X. irq_num %d\n",
375 			irq_num);
376 		return -ENOSPC;
377 	}
378 
379 	if (irq_num != msix_vecs) {
380 		dev_err(&dev->pdev->dev,
381 			"Allocated %d MSI-X (out of %d requested)\n",
382 			irq_num, msix_vecs);
383 		return -ENOSPC;
384 	}
385 
386 	return 0;
387 }
388 
389 static int efa_device_init(struct efa_com_dev *edev, struct pci_dev *pdev)
390 {
391 	int dma_width;
392 	int err;
393 
394 	err = efa_com_dev_reset(edev, EFA_REGS_RESET_NORMAL);
395 	if (err)
396 		return err;
397 
398 	err = efa_com_validate_version(edev);
399 	if (err)
400 		return err;
401 
402 	dma_width = efa_com_get_dma_width(edev);
403 	if (dma_width < 0) {
404 		err = dma_width;
405 		return err;
406 	}
407 
408 	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(dma_width));
409 	if (err) {
410 		dev_err(&pdev->dev, "pci_set_dma_mask failed %d\n", err);
411 		return err;
412 	}
413 
414 	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(dma_width));
415 	if (err) {
416 		dev_err(&pdev->dev,
417 			"err_pci_set_consistent_dma_mask failed %d\n",
418 			err);
419 		return err;
420 	}
421 	dma_set_max_seg_size(&pdev->dev, UINT_MAX);
422 	return 0;
423 }
424 
425 static struct efa_dev *efa_probe_device(struct pci_dev *pdev)
426 {
427 	struct efa_com_dev *edev;
428 	struct efa_dev *dev;
429 	int bars;
430 	int err;
431 
432 	err = pci_enable_device_mem(pdev);
433 	if (err) {
434 		dev_err(&pdev->dev, "pci_enable_device_mem() failed!\n");
435 		return ERR_PTR(err);
436 	}
437 
438 	pci_set_master(pdev);
439 
440 	dev = ib_alloc_device(efa_dev, ibdev);
441 	if (!dev) {
442 		dev_err(&pdev->dev, "Device alloc failed\n");
443 		err = -ENOMEM;
444 		goto err_disable_device;
445 	}
446 
447 	pci_set_drvdata(pdev, dev);
448 	edev = &dev->edev;
449 	edev->efa_dev = dev;
450 	edev->dmadev = &pdev->dev;
451 	dev->pdev = pdev;
452 
453 	bars = pci_select_bars(pdev, IORESOURCE_MEM) & EFA_BASE_BAR_MASK;
454 	err = pci_request_selected_regions(pdev, bars, DRV_MODULE_NAME);
455 	if (err) {
456 		dev_err(&pdev->dev, "pci_request_selected_regions failed %d\n",
457 			err);
458 		goto err_ibdev_destroy;
459 	}
460 
461 	dev->reg_bar_addr = pci_resource_start(pdev, EFA_REG_BAR);
462 	dev->reg_bar_len = pci_resource_len(pdev, EFA_REG_BAR);
463 	dev->mem_bar_addr = pci_resource_start(pdev, EFA_MEM_BAR);
464 	dev->mem_bar_len = pci_resource_len(pdev, EFA_MEM_BAR);
465 
466 	edev->reg_bar = devm_ioremap(&pdev->dev,
467 				     dev->reg_bar_addr,
468 				     dev->reg_bar_len);
469 	if (!edev->reg_bar) {
470 		dev_err(&pdev->dev, "Failed to remap register bar\n");
471 		err = -EFAULT;
472 		goto err_release_bars;
473 	}
474 
475 	err = efa_com_mmio_reg_read_init(edev);
476 	if (err) {
477 		dev_err(&pdev->dev, "Failed to init readless MMIO\n");
478 		goto err_iounmap;
479 	}
480 
481 	err = efa_device_init(edev, pdev);
482 	if (err) {
483 		dev_err(&pdev->dev, "EFA device init failed\n");
484 		if (err == -ETIME)
485 			err = -EPROBE_DEFER;
486 		goto err_reg_read_destroy;
487 	}
488 
489 	err = efa_enable_msix(dev);
490 	if (err)
491 		goto err_reg_read_destroy;
492 
493 	edev->aq.msix_vector_idx = dev->admin_msix_vector_idx;
494 	edev->aenq.msix_vector_idx = dev->admin_msix_vector_idx;
495 
496 	err = efa_set_mgmnt_irq(dev);
497 	if (err)
498 		goto err_disable_msix;
499 
500 	err = efa_com_admin_init(edev, &aenq_handlers);
501 	if (err)
502 		goto err_free_mgmnt_irq;
503 
504 	return dev;
505 
506 err_free_mgmnt_irq:
507 	efa_free_mgmnt_irq(dev);
508 err_disable_msix:
509 	efa_disable_msix(dev);
510 err_reg_read_destroy:
511 	efa_com_mmio_reg_read_destroy(edev);
512 err_iounmap:
513 	devm_iounmap(&pdev->dev, edev->reg_bar);
514 err_release_bars:
515 	efa_release_bars(dev, EFA_BASE_BAR_MASK);
516 err_ibdev_destroy:
517 	ib_dealloc_device(&dev->ibdev);
518 err_disable_device:
519 	pci_disable_device(pdev);
520 	return ERR_PTR(err);
521 }
522 
523 static void efa_remove_device(struct pci_dev *pdev)
524 {
525 	struct efa_dev *dev = pci_get_drvdata(pdev);
526 	struct efa_com_dev *edev;
527 
528 	edev = &dev->edev;
529 	efa_com_admin_destroy(edev);
530 	efa_free_mgmnt_irq(dev);
531 	efa_disable_msix(dev);
532 	efa_com_mmio_reg_read_destroy(edev);
533 	devm_iounmap(&pdev->dev, edev->reg_bar);
534 	efa_release_bars(dev, EFA_BASE_BAR_MASK);
535 	ib_dealloc_device(&dev->ibdev);
536 	pci_disable_device(pdev);
537 }
538 
539 static int efa_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
540 {
541 	struct efa_dev *dev;
542 	int err;
543 
544 	dev = efa_probe_device(pdev);
545 	if (IS_ERR(dev))
546 		return PTR_ERR(dev);
547 
548 	err = efa_ib_device_add(dev);
549 	if (err)
550 		goto err_remove_device;
551 
552 	return 0;
553 
554 err_remove_device:
555 	efa_remove_device(pdev);
556 	return err;
557 }
558 
559 static void efa_remove(struct pci_dev *pdev)
560 {
561 	struct efa_dev *dev = pci_get_drvdata(pdev);
562 
563 	efa_ib_device_remove(dev);
564 	efa_remove_device(pdev);
565 }
566 
567 static struct pci_driver efa_pci_driver = {
568 	.name           = DRV_MODULE_NAME,
569 	.id_table       = efa_pci_tbl,
570 	.probe          = efa_probe,
571 	.remove         = efa_remove,
572 };
573 
574 module_pci_driver(efa_pci_driver);
575