1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2023 Advanced Micro Devices, Inc */
3
4 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
5
6 #include <linux/pci.h>
7
8 #include <linux/pds/pds_common.h>
9
10 #include "core.h"
11
12 MODULE_DESCRIPTION(PDSC_DRV_DESCRIPTION);
13 MODULE_AUTHOR("Advanced Micro Devices, Inc");
14 MODULE_LICENSE("GPL");
15
16 /* Supported devices */
17 static const struct pci_device_id pdsc_id_table[] = {
18 { PCI_VDEVICE(PENSANDO, PCI_DEVICE_ID_PENSANDO_CORE_PF) },
19 { PCI_VDEVICE(PENSANDO, PCI_DEVICE_ID_PENSANDO_VDPA_VF) },
20 { 0, } /* end of table */
21 };
22 MODULE_DEVICE_TABLE(pci, pdsc_id_table);
23
pdsc_wdtimer_cb(struct timer_list * t)24 static void pdsc_wdtimer_cb(struct timer_list *t)
25 {
26 struct pdsc *pdsc = from_timer(pdsc, t, wdtimer);
27
28 dev_dbg(pdsc->dev, "%s: jiffies %ld\n", __func__, jiffies);
29 mod_timer(&pdsc->wdtimer,
30 round_jiffies(jiffies + pdsc->wdtimer_period));
31
32 queue_work(pdsc->wq, &pdsc->health_work);
33 }
34
pdsc_unmap_bars(struct pdsc * pdsc)35 static void pdsc_unmap_bars(struct pdsc *pdsc)
36 {
37 struct pdsc_dev_bar *bars = pdsc->bars;
38 unsigned int i;
39
40 pdsc->info_regs = NULL;
41 pdsc->cmd_regs = NULL;
42 pdsc->intr_status = NULL;
43 pdsc->intr_ctrl = NULL;
44
45 for (i = 0; i < PDS_CORE_BARS_MAX; i++) {
46 if (bars[i].vaddr)
47 pci_iounmap(pdsc->pdev, bars[i].vaddr);
48 }
49 }
50
pdsc_map_bars(struct pdsc * pdsc)51 static int pdsc_map_bars(struct pdsc *pdsc)
52 {
53 struct pdsc_dev_bar *bar = pdsc->bars;
54 struct pci_dev *pdev = pdsc->pdev;
55 struct device *dev = pdsc->dev;
56 struct pdsc_dev_bar *bars;
57 unsigned int i, j;
58 int num_bars = 0;
59 int err;
60 u32 sig;
61
62 bars = pdsc->bars;
63
64 /* Since the PCI interface in the hardware is configurable,
65 * we need to poke into all the bars to find the set we're
66 * expecting.
67 */
68 for (i = 0, j = 0; i < PDS_CORE_BARS_MAX; i++) {
69 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
70 continue;
71
72 bars[j].len = pci_resource_len(pdev, i);
73 bars[j].bus_addr = pci_resource_start(pdev, i);
74 bars[j].res_index = i;
75
76 /* only map the whole bar 0 */
77 if (j > 0) {
78 bars[j].vaddr = NULL;
79 } else {
80 bars[j].vaddr = pci_iomap(pdev, i, bars[j].len);
81 if (!bars[j].vaddr) {
82 dev_err(dev, "Cannot map BAR %d, aborting\n", i);
83 return -ENODEV;
84 }
85 }
86
87 j++;
88 }
89 num_bars = j;
90
91 /* BAR0: dev_cmd and interrupts */
92 if (num_bars < 1) {
93 dev_err(dev, "No bars found\n");
94 err = -EFAULT;
95 goto err_out;
96 }
97
98 if (bar->len < PDS_CORE_BAR0_SIZE) {
99 dev_err(dev, "Resource bar size %lu too small\n", bar->len);
100 err = -EFAULT;
101 goto err_out;
102 }
103
104 pdsc->info_regs = bar->vaddr + PDS_CORE_BAR0_DEV_INFO_REGS_OFFSET;
105 pdsc->cmd_regs = bar->vaddr + PDS_CORE_BAR0_DEV_CMD_REGS_OFFSET;
106 pdsc->intr_status = bar->vaddr + PDS_CORE_BAR0_INTR_STATUS_OFFSET;
107 pdsc->intr_ctrl = bar->vaddr + PDS_CORE_BAR0_INTR_CTRL_OFFSET;
108
109 sig = ioread32(&pdsc->info_regs->signature);
110 if (sig != PDS_CORE_DEV_INFO_SIGNATURE) {
111 dev_err(dev, "Incompatible firmware signature %x", sig);
112 err = -EFAULT;
113 goto err_out;
114 }
115
116 /* BAR1: doorbells */
117 bar++;
118 if (num_bars < 2) {
119 dev_err(dev, "Doorbell bar missing\n");
120 err = -EFAULT;
121 goto err_out;
122 }
123
124 pdsc->db_pages = bar->vaddr;
125 pdsc->phy_db_pages = bar->bus_addr;
126
127 return 0;
128
129 err_out:
130 pdsc_unmap_bars(pdsc);
131 return err;
132 }
133
pdsc_map_dbpage(struct pdsc * pdsc,int page_num)134 void __iomem *pdsc_map_dbpage(struct pdsc *pdsc, int page_num)
135 {
136 return pci_iomap_range(pdsc->pdev,
137 pdsc->bars[PDS_CORE_PCI_BAR_DBELL].res_index,
138 (u64)page_num << PAGE_SHIFT, PAGE_SIZE);
139 }
140
pdsc_sriov_configure(struct pci_dev * pdev,int num_vfs)141 static int pdsc_sriov_configure(struct pci_dev *pdev, int num_vfs)
142 {
143 struct pdsc *pdsc = pci_get_drvdata(pdev);
144 struct device *dev = pdsc->dev;
145 int ret = 0;
146
147 if (num_vfs > 0) {
148 pdsc->vfs = kcalloc(num_vfs, sizeof(struct pdsc_vf),
149 GFP_KERNEL);
150 if (!pdsc->vfs)
151 return -ENOMEM;
152 pdsc->num_vfs = num_vfs;
153
154 ret = pci_enable_sriov(pdev, num_vfs);
155 if (ret) {
156 dev_err(dev, "Cannot enable SRIOV: %pe\n",
157 ERR_PTR(ret));
158 goto no_vfs;
159 }
160
161 return num_vfs;
162 }
163
164 no_vfs:
165 pci_disable_sriov(pdev);
166
167 kfree(pdsc->vfs);
168 pdsc->vfs = NULL;
169 pdsc->num_vfs = 0;
170
171 return ret;
172 }
173
pdsc_init_vf(struct pdsc * vf)174 static int pdsc_init_vf(struct pdsc *vf)
175 {
176 struct devlink *dl;
177 struct pdsc *pf;
178 int err;
179
180 pf = pdsc_get_pf_struct(vf->pdev);
181 if (IS_ERR_OR_NULL(pf))
182 return PTR_ERR(pf) ?: -1;
183
184 vf->vf_id = pci_iov_vf_id(vf->pdev);
185
186 dl = priv_to_devlink(vf);
187 devl_lock(dl);
188 devl_register(dl);
189 devl_unlock(dl);
190
191 pf->vfs[vf->vf_id].vf = vf;
192 err = pdsc_auxbus_dev_add(vf, pf);
193 if (err) {
194 devl_lock(dl);
195 devl_unregister(dl);
196 devl_unlock(dl);
197 }
198
199 return err;
200 }
201
202 static const struct devlink_health_reporter_ops pdsc_fw_reporter_ops = {
203 .name = "fw",
204 .diagnose = pdsc_fw_reporter_diagnose,
205 };
206
207 static const struct devlink_param pdsc_dl_params[] = {
208 DEVLINK_PARAM_GENERIC(ENABLE_VNET,
209 BIT(DEVLINK_PARAM_CMODE_RUNTIME),
210 pdsc_dl_enable_get,
211 pdsc_dl_enable_set,
212 pdsc_dl_enable_validate),
213 };
214
215 #define PDSC_WQ_NAME_LEN 24
216
pdsc_init_pf(struct pdsc * pdsc)217 static int pdsc_init_pf(struct pdsc *pdsc)
218 {
219 struct devlink_health_reporter *hr;
220 char wq_name[PDSC_WQ_NAME_LEN];
221 struct devlink *dl;
222 int err;
223
224 pcie_print_link_status(pdsc->pdev);
225
226 err = pci_request_regions(pdsc->pdev, PDS_CORE_DRV_NAME);
227 if (err) {
228 dev_err(pdsc->dev, "Cannot request PCI regions: %pe\n",
229 ERR_PTR(err));
230 return err;
231 }
232
233 err = pdsc_map_bars(pdsc);
234 if (err)
235 goto err_out_release_regions;
236
237 /* General workqueue and timer, but don't start timer yet */
238 snprintf(wq_name, sizeof(wq_name), "%s.%d", PDS_CORE_DRV_NAME, pdsc->uid);
239 pdsc->wq = create_singlethread_workqueue(wq_name);
240 INIT_WORK(&pdsc->health_work, pdsc_health_thread);
241 timer_setup(&pdsc->wdtimer, pdsc_wdtimer_cb, 0);
242 pdsc->wdtimer_period = PDSC_WATCHDOG_SECS * HZ;
243
244 mutex_init(&pdsc->devcmd_lock);
245 mutex_init(&pdsc->config_lock);
246 spin_lock_init(&pdsc->adminq_lock);
247
248 mutex_lock(&pdsc->config_lock);
249 set_bit(PDSC_S_FW_DEAD, &pdsc->state);
250
251 err = pdsc_setup(pdsc, PDSC_SETUP_INIT);
252 if (err) {
253 mutex_unlock(&pdsc->config_lock);
254 goto err_out_unmap_bars;
255 }
256
257 err = pdsc_start(pdsc);
258 if (err) {
259 mutex_unlock(&pdsc->config_lock);
260 goto err_out_teardown;
261 }
262
263 mutex_unlock(&pdsc->config_lock);
264
265 dl = priv_to_devlink(pdsc);
266 devl_lock(dl);
267 err = devl_params_register(dl, pdsc_dl_params,
268 ARRAY_SIZE(pdsc_dl_params));
269 if (err) {
270 devl_unlock(dl);
271 dev_warn(pdsc->dev, "Failed to register devlink params: %pe\n",
272 ERR_PTR(err));
273 goto err_out_stop;
274 }
275
276 hr = devl_health_reporter_create(dl, &pdsc_fw_reporter_ops, 0, pdsc);
277 if (IS_ERR(hr)) {
278 devl_unlock(dl);
279 dev_warn(pdsc->dev, "Failed to create fw reporter: %pe\n", hr);
280 err = PTR_ERR(hr);
281 goto err_out_unreg_params;
282 }
283 pdsc->fw_reporter = hr;
284
285 devl_register(dl);
286 devl_unlock(dl);
287
288 /* Lastly, start the health check timer */
289 mod_timer(&pdsc->wdtimer, round_jiffies(jiffies + pdsc->wdtimer_period));
290
291 return 0;
292
293 err_out_unreg_params:
294 devlink_params_unregister(dl, pdsc_dl_params,
295 ARRAY_SIZE(pdsc_dl_params));
296 err_out_stop:
297 pdsc_stop(pdsc);
298 err_out_teardown:
299 pdsc_teardown(pdsc, PDSC_TEARDOWN_REMOVING);
300 err_out_unmap_bars:
301 timer_shutdown_sync(&pdsc->wdtimer);
302 if (pdsc->wq)
303 destroy_workqueue(pdsc->wq);
304 mutex_destroy(&pdsc->config_lock);
305 mutex_destroy(&pdsc->devcmd_lock);
306 pci_free_irq_vectors(pdsc->pdev);
307 pdsc_unmap_bars(pdsc);
308 err_out_release_regions:
309 pci_release_regions(pdsc->pdev);
310
311 return err;
312 }
313
314 static const struct devlink_ops pdsc_dl_ops = {
315 .info_get = pdsc_dl_info_get,
316 .flash_update = pdsc_dl_flash_update,
317 };
318
319 static const struct devlink_ops pdsc_dl_vf_ops = {
320 };
321
322 static DEFINE_IDA(pdsc_ida);
323
pdsc_probe(struct pci_dev * pdev,const struct pci_device_id * ent)324 static int pdsc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
325 {
326 struct device *dev = &pdev->dev;
327 const struct devlink_ops *ops;
328 struct devlink *dl;
329 struct pdsc *pdsc;
330 bool is_pf;
331 int err;
332
333 is_pf = !pdev->is_virtfn;
334 ops = is_pf ? &pdsc_dl_ops : &pdsc_dl_vf_ops;
335 dl = devlink_alloc(ops, sizeof(struct pdsc), dev);
336 if (!dl)
337 return -ENOMEM;
338 pdsc = devlink_priv(dl);
339
340 pdsc->pdev = pdev;
341 pdsc->dev = &pdev->dev;
342 set_bit(PDSC_S_INITING_DRIVER, &pdsc->state);
343 pci_set_drvdata(pdev, pdsc);
344 pdsc_debugfs_add_dev(pdsc);
345
346 err = ida_alloc(&pdsc_ida, GFP_KERNEL);
347 if (err < 0) {
348 dev_err(pdsc->dev, "%s: id alloc failed: %pe\n",
349 __func__, ERR_PTR(err));
350 goto err_out_free_devlink;
351 }
352 pdsc->uid = err;
353
354 /* Query system for DMA addressing limitation for the device. */
355 err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(PDS_CORE_ADDR_LEN));
356 if (err) {
357 dev_err(dev, "Unable to obtain 64-bit DMA for consistent allocations, aborting: %pe\n",
358 ERR_PTR(err));
359 goto err_out_free_ida;
360 }
361
362 err = pci_enable_device(pdev);
363 if (err) {
364 dev_err(dev, "Cannot enable PCI device: %pe\n", ERR_PTR(err));
365 goto err_out_free_ida;
366 }
367 pci_set_master(pdev);
368
369 if (is_pf)
370 err = pdsc_init_pf(pdsc);
371 else
372 err = pdsc_init_vf(pdsc);
373 if (err) {
374 dev_err(dev, "Cannot init device: %pe\n", ERR_PTR(err));
375 goto err_out_disable_device;
376 }
377
378 clear_bit(PDSC_S_INITING_DRIVER, &pdsc->state);
379 return 0;
380
381 err_out_disable_device:
382 pci_disable_device(pdev);
383 err_out_free_ida:
384 ida_free(&pdsc_ida, pdsc->uid);
385 err_out_free_devlink:
386 pdsc_debugfs_del_dev(pdsc);
387 devlink_free(dl);
388
389 return err;
390 }
391
pdsc_remove(struct pci_dev * pdev)392 static void pdsc_remove(struct pci_dev *pdev)
393 {
394 struct pdsc *pdsc = pci_get_drvdata(pdev);
395 struct devlink *dl;
396
397 /* Unhook the registrations first to be sure there
398 * are no requests while we're stopping.
399 */
400 dl = priv_to_devlink(pdsc);
401 devl_lock(dl);
402 devl_unregister(dl);
403 if (!pdev->is_virtfn) {
404 if (pdsc->fw_reporter) {
405 devl_health_reporter_destroy(pdsc->fw_reporter);
406 pdsc->fw_reporter = NULL;
407 }
408 devl_params_unregister(dl, pdsc_dl_params,
409 ARRAY_SIZE(pdsc_dl_params));
410 }
411 devl_unlock(dl);
412
413 if (pdev->is_virtfn) {
414 struct pdsc *pf;
415
416 pf = pdsc_get_pf_struct(pdsc->pdev);
417 if (!IS_ERR(pf)) {
418 pdsc_auxbus_dev_del(pdsc, pf);
419 pf->vfs[pdsc->vf_id].vf = NULL;
420 }
421 } else {
422 /* Remove the VFs and their aux_bus connections before other
423 * cleanup so that the clients can use the AdminQ to cleanly
424 * shut themselves down.
425 */
426 pdsc_sriov_configure(pdev, 0);
427
428 timer_shutdown_sync(&pdsc->wdtimer);
429 if (pdsc->wq)
430 destroy_workqueue(pdsc->wq);
431
432 mutex_lock(&pdsc->config_lock);
433 set_bit(PDSC_S_STOPPING_DRIVER, &pdsc->state);
434
435 pdsc_stop(pdsc);
436 pdsc_teardown(pdsc, PDSC_TEARDOWN_REMOVING);
437 mutex_unlock(&pdsc->config_lock);
438 mutex_destroy(&pdsc->config_lock);
439 mutex_destroy(&pdsc->devcmd_lock);
440
441 pdsc_unmap_bars(pdsc);
442 pci_release_regions(pdev);
443 }
444
445 pci_disable_device(pdev);
446
447 ida_free(&pdsc_ida, pdsc->uid);
448 pdsc_debugfs_del_dev(pdsc);
449 devlink_free(dl);
450 }
451
pdsc_stop_health_thread(struct pdsc * pdsc)452 static void pdsc_stop_health_thread(struct pdsc *pdsc)
453 {
454 timer_shutdown_sync(&pdsc->wdtimer);
455 if (pdsc->health_work.func)
456 cancel_work_sync(&pdsc->health_work);
457 }
458
pdsc_restart_health_thread(struct pdsc * pdsc)459 static void pdsc_restart_health_thread(struct pdsc *pdsc)
460 {
461 timer_setup(&pdsc->wdtimer, pdsc_wdtimer_cb, 0);
462 mod_timer(&pdsc->wdtimer, jiffies + 1);
463 }
464
pdsc_reset_prepare(struct pci_dev * pdev)465 static void pdsc_reset_prepare(struct pci_dev *pdev)
466 {
467 struct pdsc *pdsc = pci_get_drvdata(pdev);
468
469 pdsc_stop_health_thread(pdsc);
470 pdsc_fw_down(pdsc);
471
472 pdsc_unmap_bars(pdsc);
473 pci_release_regions(pdev);
474 pci_disable_device(pdev);
475 }
476
pdsc_reset_done(struct pci_dev * pdev)477 static void pdsc_reset_done(struct pci_dev *pdev)
478 {
479 struct pdsc *pdsc = pci_get_drvdata(pdev);
480 struct device *dev = pdsc->dev;
481 int err;
482
483 err = pci_enable_device(pdev);
484 if (err) {
485 dev_err(dev, "Cannot enable PCI device: %pe\n", ERR_PTR(err));
486 return;
487 }
488 pci_set_master(pdev);
489
490 if (!pdev->is_virtfn) {
491 pcie_print_link_status(pdsc->pdev);
492
493 err = pci_request_regions(pdsc->pdev, PDS_CORE_DRV_NAME);
494 if (err) {
495 dev_err(pdsc->dev, "Cannot request PCI regions: %pe\n",
496 ERR_PTR(err));
497 return;
498 }
499
500 err = pdsc_map_bars(pdsc);
501 if (err)
502 return;
503 }
504
505 pdsc_fw_up(pdsc);
506 pdsc_restart_health_thread(pdsc);
507 }
508
509 static const struct pci_error_handlers pdsc_err_handler = {
510 /* FLR handling */
511 .reset_prepare = pdsc_reset_prepare,
512 .reset_done = pdsc_reset_done,
513 };
514
515 static struct pci_driver pdsc_driver = {
516 .name = PDS_CORE_DRV_NAME,
517 .id_table = pdsc_id_table,
518 .probe = pdsc_probe,
519 .remove = pdsc_remove,
520 .sriov_configure = pdsc_sriov_configure,
521 .err_handler = &pdsc_err_handler,
522 };
523
pdsc_get_pf_struct(struct pci_dev * vf_pdev)524 void *pdsc_get_pf_struct(struct pci_dev *vf_pdev)
525 {
526 return pci_iov_get_pf_drvdata(vf_pdev, &pdsc_driver);
527 }
528 EXPORT_SYMBOL_GPL(pdsc_get_pf_struct);
529
pdsc_init_module(void)530 static int __init pdsc_init_module(void)
531 {
532 if (strcmp(KBUILD_MODNAME, PDS_CORE_DRV_NAME))
533 return -EINVAL;
534
535 pdsc_debugfs_create();
536 return pci_register_driver(&pdsc_driver);
537 }
538
pdsc_cleanup_module(void)539 static void __exit pdsc_cleanup_module(void)
540 {
541 pci_unregister_driver(&pdsc_driver);
542 pdsc_debugfs_destroy();
543 }
544
545 module_init(pdsc_init_module);
546 module_exit(pdsc_cleanup_module);
547