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/fs.h>
13#include <linux/io-64-nonatomic-lo-hi.h>
14#include <linux/device.h>
15#include <linux/idr.h>
16#include <linux/iommu.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#include "perfmon.h"
23
24MODULE_VERSION(IDXD_DRIVER_VERSION);
25MODULE_LICENSE("GPL v2");
26MODULE_AUTHOR("Intel Corporation");
27MODULE_IMPORT_NS(IDXD);
28
29static bool sva = true;
30module_param(sva, bool, 0644);
31MODULE_PARM_DESC(sva, "Toggle SVA support on/off");
32
33bool tc_override;
34module_param(tc_override, bool, 0644);
35MODULE_PARM_DESC(tc_override, "Override traffic class defaults");
36
37#define DRV_NAME "idxd"
38
39bool support_enqcmd;
40DEFINE_IDA(idxd_ida);
41
42static struct idxd_driver_data idxd_driver_data[] = {
43 [IDXD_TYPE_DSA] = {
44 .name_prefix = "dsa",
45 .type = IDXD_TYPE_DSA,
46 .compl_size = sizeof(struct dsa_completion_record),
47 .align = 32,
48 .dev_type = &dsa_device_type,
49 .evl_cr_off = offsetof(struct dsa_evl_entry, cr),
50 .cr_status_off = offsetof(struct dsa_completion_record, status),
51 .cr_result_off = offsetof(struct dsa_completion_record, result),
52 },
53 [IDXD_TYPE_IAX] = {
54 .name_prefix = "iax",
55 .type = IDXD_TYPE_IAX,
56 .compl_size = sizeof(struct iax_completion_record),
57 .align = 64,
58 .dev_type = &iax_device_type,
59 .evl_cr_off = offsetof(struct iax_evl_entry, cr),
60 .cr_status_off = offsetof(struct iax_completion_record, status),
61 .cr_result_off = offsetof(struct iax_completion_record, error_code),
62 .load_device_defaults = idxd_load_iaa_device_defaults,
63 },
64};
65
66static struct pci_device_id idxd_pci_tbl[] = {
67 /* DSA ver 1.0 platforms */
68 { PCI_DEVICE_DATA(INTEL, DSA_SPR0, &idxd_driver_data[IDXD_TYPE_DSA]) },
69
70 /* IAX ver 1.0 platforms */
71 { PCI_DEVICE_DATA(INTEL, IAX_SPR0, &idxd_driver_data[IDXD_TYPE_IAX]) },
72 { 0, }
73};
74MODULE_DEVICE_TABLE(pci, idxd_pci_tbl);
75
76static int idxd_setup_interrupts(struct idxd_device *idxd)
77{
78 struct pci_dev *pdev = idxd->pdev;
79 struct device *dev = &pdev->dev;
80 struct idxd_irq_entry *ie;
81 int i, msixcnt;
82 int rc = 0;
83
84 msixcnt = pci_msix_vec_count(dev: pdev);
85 if (msixcnt < 0) {
86 dev_err(dev, "Not MSI-X interrupt capable.\n");
87 return -ENOSPC;
88 }
89 idxd->irq_cnt = msixcnt;
90
91 rc = pci_alloc_irq_vectors(dev: pdev, min_vecs: msixcnt, max_vecs: msixcnt, PCI_IRQ_MSIX);
92 if (rc != msixcnt) {
93 dev_err(dev, "Failed enabling %d MSIX entries: %d\n", msixcnt, rc);
94 return -ENOSPC;
95 }
96 dev_dbg(dev, "Enabled %d msix vectors\n", msixcnt);
97
98
99 ie = idxd_get_ie(idxd, idx: 0);
100 ie->vector = pci_irq_vector(dev: pdev, nr: 0);
101 rc = request_threaded_irq(irq: ie->vector, NULL, thread_fn: idxd_misc_thread, flags: 0, name: "idxd-misc", dev: ie);
102 if (rc < 0) {
103 dev_err(dev, "Failed to allocate misc interrupt.\n");
104 goto err_misc_irq;
105 }
106 dev_dbg(dev, "Requested idxd-misc handler on msix vector %d\n", ie->vector);
107
108 for (i = 0; i < idxd->max_wqs; i++) {
109 int msix_idx = i + 1;
110
111 ie = idxd_get_ie(idxd, idx: msix_idx);
112 ie->id = msix_idx;
113 ie->int_handle = INVALID_INT_HANDLE;
114 ie->pasid = IOMMU_PASID_INVALID;
115
116 spin_lock_init(&ie->list_lock);
117 init_llist_head(list: &ie->pending_llist);
118 INIT_LIST_HEAD(list: &ie->work_list);
119 }
120
121 idxd_unmask_error_interrupts(idxd);
122 return 0;
123
124 err_misc_irq:
125 idxd_mask_error_interrupts(idxd);
126 pci_free_irq_vectors(dev: pdev);
127 dev_err(dev, "No usable interrupts\n");
128 return rc;
129}
130
131static void idxd_cleanup_interrupts(struct idxd_device *idxd)
132{
133 struct pci_dev *pdev = idxd->pdev;
134 struct idxd_irq_entry *ie;
135 int msixcnt;
136
137 msixcnt = pci_msix_vec_count(dev: pdev);
138 if (msixcnt <= 0)
139 return;
140
141 ie = idxd_get_ie(idxd, idx: 0);
142 idxd_mask_error_interrupts(idxd);
143 free_irq(ie->vector, ie);
144 pci_free_irq_vectors(dev: pdev);
145}
146
147static int idxd_setup_wqs(struct idxd_device *idxd)
148{
149 struct device *dev = &idxd->pdev->dev;
150 struct idxd_wq *wq;
151 struct device *conf_dev;
152 int i, rc;
153
154 idxd->wqs = kcalloc_node(n: idxd->max_wqs, size: sizeof(struct idxd_wq *),
155 GFP_KERNEL, node: dev_to_node(dev));
156 if (!idxd->wqs)
157 return -ENOMEM;
158
159 idxd->wq_enable_map = bitmap_zalloc_node(nbits: idxd->max_wqs, GFP_KERNEL, node: dev_to_node(dev));
160 if (!idxd->wq_enable_map) {
161 kfree(objp: idxd->wqs);
162 return -ENOMEM;
163 }
164
165 for (i = 0; i < idxd->max_wqs; i++) {
166 wq = kzalloc_node(size: sizeof(*wq), GFP_KERNEL, node: dev_to_node(dev));
167 if (!wq) {
168 rc = -ENOMEM;
169 goto err;
170 }
171
172 idxd_dev_set_type(idev: &wq->idxd_dev, type: IDXD_DEV_WQ);
173 conf_dev = wq_confdev(wq);
174 wq->id = i;
175 wq->idxd = idxd;
176 device_initialize(wq_confdev(wq));
177 conf_dev->parent = idxd_confdev(idxd);
178 conf_dev->bus = &dsa_bus_type;
179 conf_dev->type = &idxd_wq_device_type;
180 rc = dev_set_name(dev: conf_dev, name: "wq%d.%d", idxd->id, wq->id);
181 if (rc < 0) {
182 put_device(dev: conf_dev);
183 goto err;
184 }
185
186 mutex_init(&wq->wq_lock);
187 init_waitqueue_head(&wq->err_queue);
188 init_completion(x: &wq->wq_dead);
189 init_completion(x: &wq->wq_resurrect);
190 wq->max_xfer_bytes = WQ_DEFAULT_MAX_XFER;
191 idxd_wq_set_max_batch_size(idxd_type: idxd->data->type, wq, WQ_DEFAULT_MAX_BATCH);
192 wq->enqcmds_retries = IDXD_ENQCMDS_RETRIES;
193 wq->wqcfg = kzalloc_node(size: idxd->wqcfg_size, GFP_KERNEL, node: dev_to_node(dev));
194 if (!wq->wqcfg) {
195 put_device(dev: conf_dev);
196 rc = -ENOMEM;
197 goto err;
198 }
199
200 if (idxd->hw.wq_cap.op_config) {
201 wq->opcap_bmap = bitmap_zalloc(IDXD_MAX_OPCAP_BITS, GFP_KERNEL);
202 if (!wq->opcap_bmap) {
203 put_device(dev: conf_dev);
204 rc = -ENOMEM;
205 goto err;
206 }
207 bitmap_copy(dst: wq->opcap_bmap, src: idxd->opcap_bmap, IDXD_MAX_OPCAP_BITS);
208 }
209 mutex_init(&wq->uc_lock);
210 xa_init(xa: &wq->upasid_xa);
211 idxd->wqs[i] = wq;
212 }
213
214 return 0;
215
216 err:
217 while (--i >= 0) {
218 wq = idxd->wqs[i];
219 conf_dev = wq_confdev(wq);
220 put_device(dev: conf_dev);
221 }
222 return rc;
223}
224
225static int idxd_setup_engines(struct idxd_device *idxd)
226{
227 struct idxd_engine *engine;
228 struct device *dev = &idxd->pdev->dev;
229 struct device *conf_dev;
230 int i, rc;
231
232 idxd->engines = kcalloc_node(n: idxd->max_engines, size: sizeof(struct idxd_engine *),
233 GFP_KERNEL, node: dev_to_node(dev));
234 if (!idxd->engines)
235 return -ENOMEM;
236
237 for (i = 0; i < idxd->max_engines; i++) {
238 engine = kzalloc_node(size: sizeof(*engine), GFP_KERNEL, node: dev_to_node(dev));
239 if (!engine) {
240 rc = -ENOMEM;
241 goto err;
242 }
243
244 idxd_dev_set_type(idev: &engine->idxd_dev, type: IDXD_DEV_ENGINE);
245 conf_dev = engine_confdev(engine);
246 engine->id = i;
247 engine->idxd = idxd;
248 device_initialize(dev: conf_dev);
249 conf_dev->parent = idxd_confdev(idxd);
250 conf_dev->bus = &dsa_bus_type;
251 conf_dev->type = &idxd_engine_device_type;
252 rc = dev_set_name(dev: conf_dev, name: "engine%d.%d", idxd->id, engine->id);
253 if (rc < 0) {
254 put_device(dev: conf_dev);
255 goto err;
256 }
257
258 idxd->engines[i] = engine;
259 }
260
261 return 0;
262
263 err:
264 while (--i >= 0) {
265 engine = idxd->engines[i];
266 conf_dev = engine_confdev(engine);
267 put_device(dev: conf_dev);
268 }
269 return rc;
270}
271
272static int idxd_setup_groups(struct idxd_device *idxd)
273{
274 struct device *dev = &idxd->pdev->dev;
275 struct device *conf_dev;
276 struct idxd_group *group;
277 int i, rc;
278
279 idxd->groups = kcalloc_node(n: idxd->max_groups, size: sizeof(struct idxd_group *),
280 GFP_KERNEL, node: dev_to_node(dev));
281 if (!idxd->groups)
282 return -ENOMEM;
283
284 for (i = 0; i < idxd->max_groups; i++) {
285 group = kzalloc_node(size: sizeof(*group), GFP_KERNEL, node: dev_to_node(dev));
286 if (!group) {
287 rc = -ENOMEM;
288 goto err;
289 }
290
291 idxd_dev_set_type(idev: &group->idxd_dev, type: IDXD_DEV_GROUP);
292 conf_dev = group_confdev(group);
293 group->id = i;
294 group->idxd = idxd;
295 device_initialize(dev: conf_dev);
296 conf_dev->parent = idxd_confdev(idxd);
297 conf_dev->bus = &dsa_bus_type;
298 conf_dev->type = &idxd_group_device_type;
299 rc = dev_set_name(dev: conf_dev, name: "group%d.%d", idxd->id, group->id);
300 if (rc < 0) {
301 put_device(dev: conf_dev);
302 goto err;
303 }
304
305 idxd->groups[i] = group;
306 if (idxd->hw.version <= DEVICE_VERSION_2 && !tc_override) {
307 group->tc_a = 1;
308 group->tc_b = 1;
309 } else {
310 group->tc_a = -1;
311 group->tc_b = -1;
312 }
313 /*
314 * The default value is the same as the value of
315 * total read buffers in GRPCAP.
316 */
317 group->rdbufs_allowed = idxd->max_rdbufs;
318 }
319
320 return 0;
321
322 err:
323 while (--i >= 0) {
324 group = idxd->groups[i];
325 put_device(group_confdev(group));
326 }
327 return rc;
328}
329
330static void idxd_cleanup_internals(struct idxd_device *idxd)
331{
332 int i;
333
334 for (i = 0; i < idxd->max_groups; i++)
335 put_device(group_confdev(idxd->groups[i]));
336 for (i = 0; i < idxd->max_engines; i++)
337 put_device(engine_confdev(idxd->engines[i]));
338 for (i = 0; i < idxd->max_wqs; i++)
339 put_device(wq_confdev(idxd->wqs[i]));
340 destroy_workqueue(wq: idxd->wq);
341}
342
343static int idxd_init_evl(struct idxd_device *idxd)
344{
345 struct device *dev = &idxd->pdev->dev;
346 unsigned int evl_cache_size;
347 struct idxd_evl *evl;
348 const char *idxd_name;
349
350 if (idxd->hw.gen_cap.evl_support == 0)
351 return 0;
352
353 evl = kzalloc_node(size: sizeof(*evl), GFP_KERNEL, node: dev_to_node(dev));
354 if (!evl)
355 return -ENOMEM;
356
357 spin_lock_init(&evl->lock);
358 evl->size = IDXD_EVL_SIZE_MIN;
359
360 idxd_name = dev_name(idxd_confdev(idxd));
361 evl_cache_size = sizeof(struct idxd_evl_fault) + evl_ent_size(idxd);
362 /*
363 * Since completion record in evl_cache will be copied to user
364 * when handling completion record page fault, need to create
365 * the cache suitable for user copy.
366 */
367 idxd->evl_cache = kmem_cache_create_usercopy(name: idxd_name, size: evl_cache_size,
368 align: 0, flags: 0, useroffset: 0, usersize: evl_cache_size,
369 NULL);
370 if (!idxd->evl_cache) {
371 kfree(objp: evl);
372 return -ENOMEM;
373 }
374
375 idxd->evl = evl;
376 return 0;
377}
378
379static int idxd_setup_internals(struct idxd_device *idxd)
380{
381 struct device *dev = &idxd->pdev->dev;
382 int rc, i;
383
384 init_waitqueue_head(&idxd->cmd_waitq);
385
386 rc = idxd_setup_wqs(idxd);
387 if (rc < 0)
388 goto err_wqs;
389
390 rc = idxd_setup_engines(idxd);
391 if (rc < 0)
392 goto err_engine;
393
394 rc = idxd_setup_groups(idxd);
395 if (rc < 0)
396 goto err_group;
397
398 idxd->wq = create_workqueue(dev_name(dev));
399 if (!idxd->wq) {
400 rc = -ENOMEM;
401 goto err_wkq_create;
402 }
403
404 rc = idxd_init_evl(idxd);
405 if (rc < 0)
406 goto err_evl;
407
408 return 0;
409
410 err_evl:
411 destroy_workqueue(wq: idxd->wq);
412 err_wkq_create:
413 for (i = 0; i < idxd->max_groups; i++)
414 put_device(group_confdev(idxd->groups[i]));
415 err_group:
416 for (i = 0; i < idxd->max_engines; i++)
417 put_device(engine_confdev(idxd->engines[i]));
418 err_engine:
419 for (i = 0; i < idxd->max_wqs; i++)
420 put_device(wq_confdev(idxd->wqs[i]));
421 err_wqs:
422 return rc;
423}
424
425static void idxd_read_table_offsets(struct idxd_device *idxd)
426{
427 union offsets_reg offsets;
428 struct device *dev = &idxd->pdev->dev;
429
430 offsets.bits[0] = ioread64(addr: idxd->reg_base + IDXD_TABLE_OFFSET);
431 offsets.bits[1] = ioread64(addr: idxd->reg_base + IDXD_TABLE_OFFSET + sizeof(u64));
432 idxd->grpcfg_offset = offsets.grpcfg * IDXD_TABLE_MULT;
433 dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset);
434 idxd->wqcfg_offset = offsets.wqcfg * IDXD_TABLE_MULT;
435 dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n", idxd->wqcfg_offset);
436 idxd->msix_perm_offset = offsets.msix_perm * IDXD_TABLE_MULT;
437 dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n", idxd->msix_perm_offset);
438 idxd->perfmon_offset = offsets.perfmon * IDXD_TABLE_MULT;
439 dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset);
440}
441
442void multi_u64_to_bmap(unsigned long *bmap, u64 *val, int count)
443{
444 int i, j, nr;
445
446 for (i = 0, nr = 0; i < count; i++) {
447 for (j = 0; j < BITS_PER_LONG_LONG; j++) {
448 if (val[i] & BIT(j))
449 set_bit(nr, addr: bmap);
450 nr++;
451 }
452 }
453}
454
455static void idxd_read_caps(struct idxd_device *idxd)
456{
457 struct device *dev = &idxd->pdev->dev;
458 int i;
459
460 /* reading generic capabilities */
461 idxd->hw.gen_cap.bits = ioread64(addr: idxd->reg_base + IDXD_GENCAP_OFFSET);
462 dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits);
463
464 if (idxd->hw.gen_cap.cmd_cap) {
465 idxd->hw.cmd_cap = ioread32(idxd->reg_base + IDXD_CMDCAP_OFFSET);
466 dev_dbg(dev, "cmd_cap: %#x\n", idxd->hw.cmd_cap);
467 }
468
469 /* reading command capabilities */
470 if (idxd->hw.cmd_cap & BIT(IDXD_CMD_REQUEST_INT_HANDLE))
471 idxd->request_int_handles = true;
472
473 idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift;
474 dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes);
475 idxd_set_max_batch_size(idxd_type: idxd->data->type, idxd, max_batch_size: 1U << idxd->hw.gen_cap.max_batch_shift);
476 dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size);
477 if (idxd->hw.gen_cap.config_en)
478 set_bit(nr: IDXD_FLAG_CONFIGURABLE, addr: &idxd->flags);
479
480 /* reading group capabilities */
481 idxd->hw.group_cap.bits =
482 ioread64(addr: idxd->reg_base + IDXD_GRPCAP_OFFSET);
483 dev_dbg(dev, "group_cap: %#llx\n", idxd->hw.group_cap.bits);
484 idxd->max_groups = idxd->hw.group_cap.num_groups;
485 dev_dbg(dev, "max groups: %u\n", idxd->max_groups);
486 idxd->max_rdbufs = idxd->hw.group_cap.total_rdbufs;
487 dev_dbg(dev, "max read buffers: %u\n", idxd->max_rdbufs);
488 idxd->nr_rdbufs = idxd->max_rdbufs;
489
490 /* read engine capabilities */
491 idxd->hw.engine_cap.bits =
492 ioread64(addr: idxd->reg_base + IDXD_ENGCAP_OFFSET);
493 dev_dbg(dev, "engine_cap: %#llx\n", idxd->hw.engine_cap.bits);
494 idxd->max_engines = idxd->hw.engine_cap.num_engines;
495 dev_dbg(dev, "max engines: %u\n", idxd->max_engines);
496
497 /* read workqueue capabilities */
498 idxd->hw.wq_cap.bits = ioread64(addr: idxd->reg_base + IDXD_WQCAP_OFFSET);
499 dev_dbg(dev, "wq_cap: %#llx\n", idxd->hw.wq_cap.bits);
500 idxd->max_wq_size = idxd->hw.wq_cap.total_wq_size;
501 dev_dbg(dev, "total workqueue size: %u\n", idxd->max_wq_size);
502 idxd->max_wqs = idxd->hw.wq_cap.num_wqs;
503 dev_dbg(dev, "max workqueues: %u\n", idxd->max_wqs);
504 idxd->wqcfg_size = 1 << (idxd->hw.wq_cap.wqcfg_size + IDXD_WQCFG_MIN);
505 dev_dbg(dev, "wqcfg size: %u\n", idxd->wqcfg_size);
506
507 /* reading operation capabilities */
508 for (i = 0; i < 4; i++) {
509 idxd->hw.opcap.bits[i] = ioread64(addr: idxd->reg_base +
510 IDXD_OPCAP_OFFSET + i * sizeof(u64));
511 dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]);
512 }
513 multi_u64_to_bmap(bmap: idxd->opcap_bmap, val: &idxd->hw.opcap.bits[0], count: 4);
514
515 /* read iaa cap */
516 if (idxd->data->type == IDXD_TYPE_IAX && idxd->hw.version >= DEVICE_VERSION_2)
517 idxd->hw.iaa_cap.bits = ioread64(addr: idxd->reg_base + IDXD_IAACAP_OFFSET);
518}
519
520static struct idxd_device *idxd_alloc(struct pci_dev *pdev, struct idxd_driver_data *data)
521{
522 struct device *dev = &pdev->dev;
523 struct device *conf_dev;
524 struct idxd_device *idxd;
525 int rc;
526
527 idxd = kzalloc_node(size: sizeof(*idxd), GFP_KERNEL, node: dev_to_node(dev));
528 if (!idxd)
529 return NULL;
530
531 conf_dev = idxd_confdev(idxd);
532 idxd->pdev = pdev;
533 idxd->data = data;
534 idxd_dev_set_type(idev: &idxd->idxd_dev, type: idxd->data->type);
535 idxd->id = ida_alloc(ida: &idxd_ida, GFP_KERNEL);
536 if (idxd->id < 0)
537 return NULL;
538
539 idxd->opcap_bmap = bitmap_zalloc_node(IDXD_MAX_OPCAP_BITS, GFP_KERNEL, node: dev_to_node(dev));
540 if (!idxd->opcap_bmap) {
541 ida_free(&idxd_ida, id: idxd->id);
542 return NULL;
543 }
544
545 device_initialize(dev: conf_dev);
546 conf_dev->parent = dev;
547 conf_dev->bus = &dsa_bus_type;
548 conf_dev->type = idxd->data->dev_type;
549 rc = dev_set_name(dev: conf_dev, name: "%s%d", idxd->data->name_prefix, idxd->id);
550 if (rc < 0) {
551 put_device(dev: conf_dev);
552 return NULL;
553 }
554
555 spin_lock_init(&idxd->dev_lock);
556 spin_lock_init(&idxd->cmd_lock);
557
558 return idxd;
559}
560
561static int idxd_enable_system_pasid(struct idxd_device *idxd)
562{
563 struct pci_dev *pdev = idxd->pdev;
564 struct device *dev = &pdev->dev;
565 struct iommu_domain *domain;
566 ioasid_t pasid;
567 int ret;
568
569 /*
570 * Attach a global PASID to the DMA domain so that we can use ENQCMDS
571 * to submit work on buffers mapped by DMA API.
572 */
573 domain = iommu_get_domain_for_dev(dev);
574 if (!domain)
575 return -EPERM;
576
577 pasid = iommu_alloc_global_pasid(dev);
578 if (pasid == IOMMU_PASID_INVALID)
579 return -ENOSPC;
580
581 /*
582 * DMA domain is owned by the driver, it should support all valid
583 * types such as DMA-FQ, identity, etc.
584 */
585 ret = iommu_attach_device_pasid(domain, dev, pasid);
586 if (ret) {
587 dev_err(dev, "failed to attach device pasid %d, domain type %d",
588 pasid, domain->type);
589 iommu_free_global_pasid(pasid);
590 return ret;
591 }
592
593 /* Since we set user privilege for kernel DMA, enable completion IRQ */
594 idxd_set_user_intr(idxd, enable: 1);
595 idxd->pasid = pasid;
596
597 return ret;
598}
599
600static void idxd_disable_system_pasid(struct idxd_device *idxd)
601{
602 struct pci_dev *pdev = idxd->pdev;
603 struct device *dev = &pdev->dev;
604 struct iommu_domain *domain;
605
606 domain = iommu_get_domain_for_dev(dev);
607 if (!domain)
608 return;
609
610 iommu_detach_device_pasid(domain, dev, pasid: idxd->pasid);
611 iommu_free_global_pasid(pasid: idxd->pasid);
612
613 idxd_set_user_intr(idxd, enable: 0);
614 idxd->sva = NULL;
615 idxd->pasid = IOMMU_PASID_INVALID;
616}
617
618static int idxd_enable_sva(struct pci_dev *pdev)
619{
620 int ret;
621
622 ret = iommu_dev_enable_feature(dev: &pdev->dev, f: IOMMU_DEV_FEAT_IOPF);
623 if (ret)
624 return ret;
625
626 ret = iommu_dev_enable_feature(dev: &pdev->dev, f: IOMMU_DEV_FEAT_SVA);
627 if (ret)
628 iommu_dev_disable_feature(dev: &pdev->dev, f: IOMMU_DEV_FEAT_IOPF);
629
630 return ret;
631}
632
633static void idxd_disable_sva(struct pci_dev *pdev)
634{
635 iommu_dev_disable_feature(dev: &pdev->dev, f: IOMMU_DEV_FEAT_SVA);
636 iommu_dev_disable_feature(dev: &pdev->dev, f: IOMMU_DEV_FEAT_IOPF);
637}
638
639static int idxd_probe(struct idxd_device *idxd)
640{
641 struct pci_dev *pdev = idxd->pdev;
642 struct device *dev = &pdev->dev;
643 int rc;
644
645 dev_dbg(dev, "%s entered and resetting device\n", __func__);
646 rc = idxd_device_init_reset(idxd);
647 if (rc < 0)
648 return rc;
649
650 dev_dbg(dev, "IDXD reset complete\n");
651
652 if (IS_ENABLED(CONFIG_INTEL_IDXD_SVM) && sva) {
653 if (idxd_enable_sva(pdev)) {
654 dev_warn(dev, "Unable to turn on user SVA feature.\n");
655 } else {
656 set_bit(nr: IDXD_FLAG_USER_PASID_ENABLED, addr: &idxd->flags);
657
658 rc = idxd_enable_system_pasid(idxd);
659 if (rc)
660 dev_warn(dev, "No in-kernel DMA with PASID. %d\n", rc);
661 else
662 set_bit(nr: IDXD_FLAG_PASID_ENABLED, addr: &idxd->flags);
663 }
664 } else if (!sva) {
665 dev_warn(dev, "User forced SVA off via module param.\n");
666 }
667
668 idxd_read_caps(idxd);
669 idxd_read_table_offsets(idxd);
670
671 rc = idxd_setup_internals(idxd);
672 if (rc)
673 goto err;
674
675 /* If the configs are readonly, then load them from device */
676 if (!test_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags)) {
677 dev_dbg(dev, "Loading RO device config\n");
678 rc = idxd_device_load_config(idxd);
679 if (rc < 0)
680 goto err_config;
681 }
682
683 rc = idxd_setup_interrupts(idxd);
684 if (rc)
685 goto err_config;
686
687 idxd->major = idxd_cdev_get_major(idxd);
688
689 rc = perfmon_pmu_init(idxd);
690 if (rc < 0)
691 dev_warn(dev, "Failed to initialize perfmon. No PMU support: %d\n", rc);
692
693 dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id);
694 return 0;
695
696 err_config:
697 idxd_cleanup_internals(idxd);
698 err:
699 if (device_pasid_enabled(idxd))
700 idxd_disable_system_pasid(idxd);
701 if (device_user_pasid_enabled(idxd))
702 idxd_disable_sva(pdev);
703 return rc;
704}
705
706static void idxd_cleanup(struct idxd_device *idxd)
707{
708 perfmon_pmu_remove(idxd);
709 idxd_cleanup_interrupts(idxd);
710 idxd_cleanup_internals(idxd);
711 if (device_pasid_enabled(idxd))
712 idxd_disable_system_pasid(idxd);
713 if (device_user_pasid_enabled(idxd))
714 idxd_disable_sva(pdev: idxd->pdev);
715}
716
717static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
718{
719 struct device *dev = &pdev->dev;
720 struct idxd_device *idxd;
721 struct idxd_driver_data *data = (struct idxd_driver_data *)id->driver_data;
722 int rc;
723
724 rc = pci_enable_device(dev: pdev);
725 if (rc)
726 return rc;
727
728 dev_dbg(dev, "Alloc IDXD context\n");
729 idxd = idxd_alloc(pdev, data);
730 if (!idxd) {
731 rc = -ENOMEM;
732 goto err_idxd_alloc;
733 }
734
735 dev_dbg(dev, "Mapping BARs\n");
736 idxd->reg_base = pci_iomap(dev: pdev, IDXD_MMIO_BAR, max: 0);
737 if (!idxd->reg_base) {
738 rc = -ENOMEM;
739 goto err_iomap;
740 }
741
742 dev_dbg(dev, "Set DMA masks\n");
743 rc = dma_set_mask_and_coherent(dev: &pdev->dev, DMA_BIT_MASK(64));
744 if (rc)
745 goto err;
746
747 dev_dbg(dev, "Set PCI master\n");
748 pci_set_master(dev: pdev);
749 pci_set_drvdata(pdev, data: idxd);
750
751 idxd->hw.version = ioread32(idxd->reg_base + IDXD_VER_OFFSET);
752 rc = idxd_probe(idxd);
753 if (rc) {
754 dev_err(dev, "Intel(R) IDXD DMA Engine init failed\n");
755 goto err;
756 }
757
758 if (data->load_device_defaults) {
759 rc = data->load_device_defaults(idxd);
760 if (rc)
761 dev_warn(dev, "IDXD loading device defaults failed\n");
762 }
763
764 rc = idxd_register_devices(idxd);
765 if (rc) {
766 dev_err(dev, "IDXD sysfs setup failed\n");
767 goto err_dev_register;
768 }
769
770 rc = idxd_device_init_debugfs(idxd);
771 if (rc)
772 dev_warn(dev, "IDXD debugfs failed to setup\n");
773
774 dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n",
775 idxd->hw.version);
776
777 return 0;
778
779 err_dev_register:
780 idxd_cleanup(idxd);
781 err:
782 pci_iounmap(dev: pdev, idxd->reg_base);
783 err_iomap:
784 put_device(idxd_confdev(idxd));
785 err_idxd_alloc:
786 pci_disable_device(dev: pdev);
787 return rc;
788}
789
790void idxd_wqs_quiesce(struct idxd_device *idxd)
791{
792 struct idxd_wq *wq;
793 int i;
794
795 for (i = 0; i < idxd->max_wqs; i++) {
796 wq = idxd->wqs[i];
797 if (wq->state == IDXD_WQ_ENABLED && wq->type == IDXD_WQT_KERNEL)
798 idxd_wq_quiesce(wq);
799 }
800}
801
802static void idxd_shutdown(struct pci_dev *pdev)
803{
804 struct idxd_device *idxd = pci_get_drvdata(pdev);
805 struct idxd_irq_entry *irq_entry;
806 int rc;
807
808 rc = idxd_device_disable(idxd);
809 if (rc)
810 dev_err(&pdev->dev, "Disabling device failed\n");
811
812 irq_entry = &idxd->ie;
813 synchronize_irq(irq: irq_entry->vector);
814 idxd_mask_error_interrupts(idxd);
815 flush_workqueue(idxd->wq);
816}
817
818static void idxd_remove(struct pci_dev *pdev)
819{
820 struct idxd_device *idxd = pci_get_drvdata(pdev);
821 struct idxd_irq_entry *irq_entry;
822
823 idxd_unregister_devices(idxd);
824 /*
825 * When ->release() is called for the idxd->conf_dev, it frees all the memory related
826 * to the idxd context. The driver still needs those bits in order to do the rest of
827 * the cleanup. However, we do need to unbound the idxd sub-driver. So take a ref
828 * on the device here to hold off the freeing while allowing the idxd sub-driver
829 * to unbind.
830 */
831 get_device(idxd_confdev(idxd));
832 device_unregister(idxd_confdev(idxd));
833 idxd_shutdown(pdev);
834 if (device_pasid_enabled(idxd))
835 idxd_disable_system_pasid(idxd);
836 idxd_device_remove_debugfs(idxd);
837
838 irq_entry = idxd_get_ie(idxd, idx: 0);
839 free_irq(irq_entry->vector, irq_entry);
840 pci_free_irq_vectors(dev: pdev);
841 pci_iounmap(dev: pdev, idxd->reg_base);
842 if (device_user_pasid_enabled(idxd))
843 idxd_disable_sva(pdev);
844 pci_disable_device(dev: pdev);
845 destroy_workqueue(wq: idxd->wq);
846 perfmon_pmu_remove(idxd);
847 put_device(idxd_confdev(idxd));
848}
849
850static struct pci_driver idxd_pci_driver = {
851 .name = DRV_NAME,
852 .id_table = idxd_pci_tbl,
853 .probe = idxd_pci_probe,
854 .remove = idxd_remove,
855 .shutdown = idxd_shutdown,
856};
857
858static int __init idxd_init_module(void)
859{
860 int err;
861
862 /*
863 * If the CPU does not support MOVDIR64B or ENQCMDS, there's no point in
864 * enumerating the device. We can not utilize it.
865 */
866 if (!cpu_feature_enabled(X86_FEATURE_MOVDIR64B)) {
867 pr_warn("idxd driver failed to load without MOVDIR64B.\n");
868 return -ENODEV;
869 }
870
871 if (!cpu_feature_enabled(X86_FEATURE_ENQCMD))
872 pr_warn("Platform does not have ENQCMD(S) support.\n");
873 else
874 support_enqcmd = true;
875
876 perfmon_init();
877
878 err = idxd_driver_register(&idxd_drv);
879 if (err < 0)
880 goto err_idxd_driver_register;
881
882 err = idxd_driver_register(&idxd_dmaengine_drv);
883 if (err < 0)
884 goto err_idxd_dmaengine_driver_register;
885
886 err = idxd_driver_register(&idxd_user_drv);
887 if (err < 0)
888 goto err_idxd_user_driver_register;
889
890 err = idxd_cdev_register();
891 if (err)
892 goto err_cdev_register;
893
894 err = idxd_init_debugfs();
895 if (err)
896 goto err_debugfs;
897
898 err = pci_register_driver(&idxd_pci_driver);
899 if (err)
900 goto err_pci_register;
901
902 return 0;
903
904err_pci_register:
905 idxd_remove_debugfs();
906err_debugfs:
907 idxd_cdev_remove();
908err_cdev_register:
909 idxd_driver_unregister(idxd_drv: &idxd_user_drv);
910err_idxd_user_driver_register:
911 idxd_driver_unregister(idxd_drv: &idxd_dmaengine_drv);
912err_idxd_dmaengine_driver_register:
913 idxd_driver_unregister(idxd_drv: &idxd_drv);
914err_idxd_driver_register:
915 return err;
916}
917module_init(idxd_init_module);
918
919static void __exit idxd_exit_module(void)
920{
921 idxd_driver_unregister(idxd_drv: &idxd_user_drv);
922 idxd_driver_unregister(idxd_drv: &idxd_dmaengine_drv);
923 idxd_driver_unregister(idxd_drv: &idxd_drv);
924 pci_unregister_driver(dev: &idxd_pci_driver);
925 idxd_cdev_remove();
926 perfmon_exit();
927 idxd_remove_debugfs();
928}
929module_exit(idxd_exit_module);
930

source code of linux/drivers/dma/idxd/init.c