1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
3 #include <linux/init.h>
4 #include <linux/kernel.h>
5 #include <linux/module.h>
6 #include <linux/slab.h>
7 #include <linux/pci.h>
8 #include <linux/interrupt.h>
9 #include <linux/delay.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/workqueue.h>
12 #include <linux/aer.h>
13 #include <linux/fs.h>
14 #include <linux/io-64-nonatomic-lo-hi.h>
15 #include <linux/device.h>
16 #include <linux/idr.h>
17 #include <uapi/linux/idxd.h>
18 #include <linux/dmaengine.h>
19 #include "../dmaengine.h"
20 #include "registers.h"
21 #include "idxd.h"
22
23 MODULE_VERSION(IDXD_DRIVER_VERSION);
24 MODULE_LICENSE("GPL v2");
25 MODULE_AUTHOR("Intel Corporation");
26
27 #define DRV_NAME "idxd"
28
29 static struct idr idxd_idrs[IDXD_TYPE_MAX];
30 static struct mutex idxd_idr_lock;
31
32 static struct pci_device_id idxd_pci_tbl[] = {
33 /* DSA ver 1.0 platforms */
34 { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_DSA_SPR0) },
35 { 0, }
36 };
37 MODULE_DEVICE_TABLE(pci, idxd_pci_tbl);
38
39 static char *idxd_name[] = {
40 "dsa",
41 };
42
idxd_get_dev_name(struct idxd_device * idxd)43 const char *idxd_get_dev_name(struct idxd_device *idxd)
44 {
45 return idxd_name[idxd->type];
46 }
47
idxd_setup_interrupts(struct idxd_device * idxd)48 static int idxd_setup_interrupts(struct idxd_device *idxd)
49 {
50 struct pci_dev *pdev = idxd->pdev;
51 struct device *dev = &pdev->dev;
52 struct msix_entry *msix;
53 struct idxd_irq_entry *irq_entry;
54 int i, msixcnt;
55 int rc = 0;
56
57 msixcnt = pci_msix_vec_count(pdev);
58 if (msixcnt < 0) {
59 dev_err(dev, "Not MSI-X interrupt capable.\n");
60 goto err_no_irq;
61 }
62
63 idxd->msix_entries = devm_kzalloc(dev, sizeof(struct msix_entry) *
64 msixcnt, GFP_KERNEL);
65 if (!idxd->msix_entries) {
66 rc = -ENOMEM;
67 goto err_no_irq;
68 }
69
70 for (i = 0; i < msixcnt; i++)
71 idxd->msix_entries[i].entry = i;
72
73 rc = pci_enable_msix_exact(pdev, idxd->msix_entries, msixcnt);
74 if (rc) {
75 dev_err(dev, "Failed enabling %d MSIX entries.\n", msixcnt);
76 goto err_no_irq;
77 }
78 dev_dbg(dev, "Enabled %d msix vectors\n", msixcnt);
79
80 /*
81 * We implement 1 completion list per MSI-X entry except for
82 * entry 0, which is for errors and others.
83 */
84 idxd->irq_entries = devm_kcalloc(dev, msixcnt,
85 sizeof(struct idxd_irq_entry),
86 GFP_KERNEL);
87 if (!idxd->irq_entries) {
88 rc = -ENOMEM;
89 goto err_no_irq;
90 }
91
92 for (i = 0; i < msixcnt; i++) {
93 idxd->irq_entries[i].id = i;
94 idxd->irq_entries[i].idxd = idxd;
95 }
96
97 msix = &idxd->msix_entries[0];
98 irq_entry = &idxd->irq_entries[0];
99 rc = devm_request_threaded_irq(dev, msix->vector, idxd_irq_handler,
100 idxd_misc_thread, 0, "idxd-misc",
101 irq_entry);
102 if (rc < 0) {
103 dev_err(dev, "Failed to allocate misc interrupt.\n");
104 goto err_no_irq;
105 }
106
107 dev_dbg(dev, "Allocated idxd-misc handler on msix vector %d\n",
108 msix->vector);
109
110 /* first MSI-X entry is not for wq interrupts */
111 idxd->num_wq_irqs = msixcnt - 1;
112
113 for (i = 1; i < msixcnt; i++) {
114 msix = &idxd->msix_entries[i];
115 irq_entry = &idxd->irq_entries[i];
116
117 init_llist_head(&idxd->irq_entries[i].pending_llist);
118 INIT_LIST_HEAD(&idxd->irq_entries[i].work_list);
119 rc = devm_request_threaded_irq(dev, msix->vector,
120 idxd_irq_handler,
121 idxd_wq_thread, 0,
122 "idxd-portal", irq_entry);
123 if (rc < 0) {
124 dev_err(dev, "Failed to allocate irq %d.\n",
125 msix->vector);
126 goto err_no_irq;
127 }
128 dev_dbg(dev, "Allocated idxd-msix %d for vector %d\n",
129 i, msix->vector);
130 }
131
132 idxd_unmask_error_interrupts(idxd);
133
134 return 0;
135
136 err_no_irq:
137 /* Disable error interrupt generation */
138 idxd_mask_error_interrupts(idxd);
139 pci_disable_msix(pdev);
140 dev_err(dev, "No usable interrupts\n");
141 return rc;
142 }
143
idxd_setup_internals(struct idxd_device * idxd)144 static int idxd_setup_internals(struct idxd_device *idxd)
145 {
146 struct device *dev = &idxd->pdev->dev;
147 int i;
148
149 init_waitqueue_head(&idxd->cmd_waitq);
150 idxd->groups = devm_kcalloc(dev, idxd->max_groups,
151 sizeof(struct idxd_group), GFP_KERNEL);
152 if (!idxd->groups)
153 return -ENOMEM;
154
155 for (i = 0; i < idxd->max_groups; i++) {
156 idxd->groups[i].idxd = idxd;
157 idxd->groups[i].id = i;
158 idxd->groups[i].tc_a = -1;
159 idxd->groups[i].tc_b = -1;
160 }
161
162 idxd->wqs = devm_kcalloc(dev, idxd->max_wqs, sizeof(struct idxd_wq),
163 GFP_KERNEL);
164 if (!idxd->wqs)
165 return -ENOMEM;
166
167 idxd->engines = devm_kcalloc(dev, idxd->max_engines,
168 sizeof(struct idxd_engine), GFP_KERNEL);
169 if (!idxd->engines)
170 return -ENOMEM;
171
172 for (i = 0; i < idxd->max_wqs; i++) {
173 struct idxd_wq *wq = &idxd->wqs[i];
174
175 wq->id = i;
176 wq->idxd = idxd;
177 mutex_init(&wq->wq_lock);
178 init_waitqueue_head(&wq->err_queue);
179 wq->max_xfer_bytes = idxd->max_xfer_bytes;
180 wq->max_batch_size = idxd->max_batch_size;
181 wq->wqcfg = devm_kzalloc(dev, idxd->wqcfg_size, GFP_KERNEL);
182 if (!wq->wqcfg)
183 return -ENOMEM;
184 }
185
186 for (i = 0; i < idxd->max_engines; i++) {
187 idxd->engines[i].idxd = idxd;
188 idxd->engines[i].id = i;
189 }
190
191 idxd->wq = create_workqueue(dev_name(dev));
192 if (!idxd->wq)
193 return -ENOMEM;
194
195 return 0;
196 }
197
idxd_read_table_offsets(struct idxd_device * idxd)198 static void idxd_read_table_offsets(struct idxd_device *idxd)
199 {
200 union offsets_reg offsets;
201 struct device *dev = &idxd->pdev->dev;
202
203 offsets.bits[0] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET);
204 offsets.bits[1] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET
205 + sizeof(u64));
206 idxd->grpcfg_offset = offsets.grpcfg * 0x100;
207 dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset);
208 idxd->wqcfg_offset = offsets.wqcfg * 0x100;
209 dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n",
210 idxd->wqcfg_offset);
211 idxd->msix_perm_offset = offsets.msix_perm * 0x100;
212 dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n",
213 idxd->msix_perm_offset);
214 idxd->perfmon_offset = offsets.perfmon * 0x100;
215 dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset);
216 }
217
idxd_read_caps(struct idxd_device * idxd)218 static void idxd_read_caps(struct idxd_device *idxd)
219 {
220 struct device *dev = &idxd->pdev->dev;
221 int i;
222
223 /* reading generic capabilities */
224 idxd->hw.gen_cap.bits = ioread64(idxd->reg_base + IDXD_GENCAP_OFFSET);
225 dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits);
226 idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift;
227 dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes);
228 idxd->max_batch_size = 1U << idxd->hw.gen_cap.max_batch_shift;
229 dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size);
230 if (idxd->hw.gen_cap.config_en)
231 set_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags);
232
233 /* reading group capabilities */
234 idxd->hw.group_cap.bits =
235 ioread64(idxd->reg_base + IDXD_GRPCAP_OFFSET);
236 dev_dbg(dev, "group_cap: %#llx\n", idxd->hw.group_cap.bits);
237 idxd->max_groups = idxd->hw.group_cap.num_groups;
238 dev_dbg(dev, "max groups: %u\n", idxd->max_groups);
239 idxd->max_tokens = idxd->hw.group_cap.total_tokens;
240 dev_dbg(dev, "max tokens: %u\n", idxd->max_tokens);
241 idxd->nr_tokens = idxd->max_tokens;
242
243 /* read engine capabilities */
244 idxd->hw.engine_cap.bits =
245 ioread64(idxd->reg_base + IDXD_ENGCAP_OFFSET);
246 dev_dbg(dev, "engine_cap: %#llx\n", idxd->hw.engine_cap.bits);
247 idxd->max_engines = idxd->hw.engine_cap.num_engines;
248 dev_dbg(dev, "max engines: %u\n", idxd->max_engines);
249
250 /* read workqueue capabilities */
251 idxd->hw.wq_cap.bits = ioread64(idxd->reg_base + IDXD_WQCAP_OFFSET);
252 dev_dbg(dev, "wq_cap: %#llx\n", idxd->hw.wq_cap.bits);
253 idxd->max_wq_size = idxd->hw.wq_cap.total_wq_size;
254 dev_dbg(dev, "total workqueue size: %u\n", idxd->max_wq_size);
255 idxd->max_wqs = idxd->hw.wq_cap.num_wqs;
256 dev_dbg(dev, "max workqueues: %u\n", idxd->max_wqs);
257 idxd->wqcfg_size = 1 << (idxd->hw.wq_cap.wqcfg_size + IDXD_WQCFG_MIN);
258 dev_dbg(dev, "wqcfg size: %u\n", idxd->wqcfg_size);
259
260 /* reading operation capabilities */
261 for (i = 0; i < 4; i++) {
262 idxd->hw.opcap.bits[i] = ioread64(idxd->reg_base +
263 IDXD_OPCAP_OFFSET + i * sizeof(u64));
264 dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]);
265 }
266 }
267
idxd_alloc(struct pci_dev * pdev,void __iomem * const * iomap)268 static struct idxd_device *idxd_alloc(struct pci_dev *pdev,
269 void __iomem * const *iomap)
270 {
271 struct device *dev = &pdev->dev;
272 struct idxd_device *idxd;
273
274 idxd = devm_kzalloc(dev, sizeof(struct idxd_device), GFP_KERNEL);
275 if (!idxd)
276 return NULL;
277
278 idxd->pdev = pdev;
279 idxd->reg_base = iomap[IDXD_MMIO_BAR];
280 spin_lock_init(&idxd->dev_lock);
281
282 return idxd;
283 }
284
idxd_probe(struct idxd_device * idxd)285 static int idxd_probe(struct idxd_device *idxd)
286 {
287 struct pci_dev *pdev = idxd->pdev;
288 struct device *dev = &pdev->dev;
289 int rc;
290
291 dev_dbg(dev, "%s entered and resetting device\n", __func__);
292 rc = idxd_device_init_reset(idxd);
293 if (rc < 0)
294 return rc;
295
296 dev_dbg(dev, "IDXD reset complete\n");
297
298 idxd_read_caps(idxd);
299 idxd_read_table_offsets(idxd);
300
301 rc = idxd_setup_internals(idxd);
302 if (rc)
303 goto err_setup;
304
305 rc = idxd_setup_interrupts(idxd);
306 if (rc)
307 goto err_setup;
308
309 dev_dbg(dev, "IDXD interrupt setup complete.\n");
310
311 mutex_lock(&idxd_idr_lock);
312 idxd->id = idr_alloc(&idxd_idrs[idxd->type], idxd, 0, 0, GFP_KERNEL);
313 mutex_unlock(&idxd_idr_lock);
314 if (idxd->id < 0) {
315 rc = -ENOMEM;
316 goto err_idr_fail;
317 }
318
319 idxd->major = idxd_cdev_get_major(idxd);
320
321 dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id);
322 return 0;
323
324 err_idr_fail:
325 idxd_mask_error_interrupts(idxd);
326 idxd_mask_msix_vectors(idxd);
327 err_setup:
328 return rc;
329 }
330
idxd_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)331 static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
332 {
333 void __iomem * const *iomap;
334 struct device *dev = &pdev->dev;
335 struct idxd_device *idxd;
336 int rc;
337 unsigned int mask;
338
339 rc = pcim_enable_device(pdev);
340 if (rc)
341 return rc;
342
343 dev_dbg(dev, "Mapping BARs\n");
344 mask = (1 << IDXD_MMIO_BAR);
345 rc = pcim_iomap_regions(pdev, mask, DRV_NAME);
346 if (rc)
347 return rc;
348
349 iomap = pcim_iomap_table(pdev);
350 if (!iomap)
351 return -ENOMEM;
352
353 dev_dbg(dev, "Set DMA masks\n");
354 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
355 if (rc)
356 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
357 if (rc)
358 return rc;
359
360 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
361 if (rc)
362 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
363 if (rc)
364 return rc;
365
366 dev_dbg(dev, "Alloc IDXD context\n");
367 idxd = idxd_alloc(pdev, iomap);
368 if (!idxd)
369 return -ENOMEM;
370
371 idxd_set_type(idxd);
372
373 dev_dbg(dev, "Set PCI master\n");
374 pci_set_master(pdev);
375 pci_set_drvdata(pdev, idxd);
376
377 idxd->hw.version = ioread32(idxd->reg_base + IDXD_VER_OFFSET);
378 rc = idxd_probe(idxd);
379 if (rc) {
380 dev_err(dev, "Intel(R) IDXD DMA Engine init failed\n");
381 return -ENODEV;
382 }
383
384 rc = idxd_setup_sysfs(idxd);
385 if (rc) {
386 dev_err(dev, "IDXD sysfs setup failed\n");
387 return -ENODEV;
388 }
389
390 idxd->state = IDXD_DEV_CONF_READY;
391
392 dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n",
393 idxd->hw.version);
394
395 return 0;
396 }
397
idxd_flush_pending_llist(struct idxd_irq_entry * ie)398 static void idxd_flush_pending_llist(struct idxd_irq_entry *ie)
399 {
400 struct idxd_desc *desc, *itr;
401 struct llist_node *head;
402
403 head = llist_del_all(&ie->pending_llist);
404 if (!head)
405 return;
406
407 llist_for_each_entry_safe(desc, itr, head, llnode) {
408 idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
409 idxd_free_desc(desc->wq, desc);
410 }
411 }
412
idxd_flush_work_list(struct idxd_irq_entry * ie)413 static void idxd_flush_work_list(struct idxd_irq_entry *ie)
414 {
415 struct idxd_desc *desc, *iter;
416
417 list_for_each_entry_safe(desc, iter, &ie->work_list, list) {
418 list_del(&desc->list);
419 idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
420 idxd_free_desc(desc->wq, desc);
421 }
422 }
423
idxd_shutdown(struct pci_dev * pdev)424 static void idxd_shutdown(struct pci_dev *pdev)
425 {
426 struct idxd_device *idxd = pci_get_drvdata(pdev);
427 int rc, i;
428 struct idxd_irq_entry *irq_entry;
429 int msixcnt = pci_msix_vec_count(pdev);
430
431 rc = idxd_device_disable(idxd);
432 if (rc)
433 dev_err(&pdev->dev, "Disabling device failed\n");
434
435 dev_dbg(&pdev->dev, "%s called\n", __func__);
436 idxd_mask_msix_vectors(idxd);
437 idxd_mask_error_interrupts(idxd);
438
439 for (i = 0; i < msixcnt; i++) {
440 irq_entry = &idxd->irq_entries[i];
441 synchronize_irq(idxd->msix_entries[i].vector);
442 if (i == 0)
443 continue;
444 idxd_flush_pending_llist(irq_entry);
445 idxd_flush_work_list(irq_entry);
446 }
447
448 destroy_workqueue(idxd->wq);
449 }
450
idxd_remove(struct pci_dev * pdev)451 static void idxd_remove(struct pci_dev *pdev)
452 {
453 struct idxd_device *idxd = pci_get_drvdata(pdev);
454
455 dev_dbg(&pdev->dev, "%s called\n", __func__);
456 idxd_cleanup_sysfs(idxd);
457 idxd_shutdown(pdev);
458 mutex_lock(&idxd_idr_lock);
459 idr_remove(&idxd_idrs[idxd->type], idxd->id);
460 mutex_unlock(&idxd_idr_lock);
461 }
462
463 static struct pci_driver idxd_pci_driver = {
464 .name = DRV_NAME,
465 .id_table = idxd_pci_tbl,
466 .probe = idxd_pci_probe,
467 .remove = idxd_remove,
468 .shutdown = idxd_shutdown,
469 };
470
idxd_init_module(void)471 static int __init idxd_init_module(void)
472 {
473 int err, i;
474
475 /*
476 * If the CPU does not support write512, there's no point in
477 * enumerating the device. We can not utilize it.
478 */
479 if (!boot_cpu_has(X86_FEATURE_MOVDIR64B)) {
480 pr_warn("idxd driver failed to load without MOVDIR64B.\n");
481 return -ENODEV;
482 }
483
484 pr_info("%s: Intel(R) Accelerator Devices Driver %s\n",
485 DRV_NAME, IDXD_DRIVER_VERSION);
486
487 mutex_init(&idxd_idr_lock);
488 for (i = 0; i < IDXD_TYPE_MAX; i++)
489 idr_init(&idxd_idrs[i]);
490
491 err = idxd_register_bus_type();
492 if (err < 0)
493 return err;
494
495 err = idxd_register_driver();
496 if (err < 0)
497 goto err_idxd_driver_register;
498
499 err = idxd_cdev_register();
500 if (err)
501 goto err_cdev_register;
502
503 err = pci_register_driver(&idxd_pci_driver);
504 if (err)
505 goto err_pci_register;
506
507 return 0;
508
509 err_pci_register:
510 idxd_cdev_remove();
511 err_cdev_register:
512 idxd_unregister_driver();
513 err_idxd_driver_register:
514 idxd_unregister_bus_type();
515 return err;
516 }
517 module_init(idxd_init_module);
518
idxd_exit_module(void)519 static void __exit idxd_exit_module(void)
520 {
521 idxd_unregister_driver();
522 pci_unregister_driver(&idxd_pci_driver);
523 idxd_cdev_remove();
524 idxd_unregister_bus_type();
525 }
526 module_exit(idxd_exit_module);
527