1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2017 - 2019 Pensando Systems, Inc */
3 
4 #include <linux/module.h>
5 #include <linux/netdevice.h>
6 #include <linux/etherdevice.h>
7 #include <linux/pci.h>
8 
9 #include "ionic.h"
10 #include "ionic_bus.h"
11 #include "ionic_lif.h"
12 #include "ionic_debugfs.h"
13 
14 /* Supported devices */
15 static const struct pci_device_id ionic_id_table[] = {
16 	{ PCI_VDEVICE(PENSANDO, PCI_DEVICE_ID_PENSANDO_IONIC_ETH_PF) },
17 	{ PCI_VDEVICE(PENSANDO, PCI_DEVICE_ID_PENSANDO_IONIC_ETH_VF) },
18 	{ 0, }	/* end of table */
19 };
20 MODULE_DEVICE_TABLE(pci, ionic_id_table);
21 
22 int ionic_bus_get_irq(struct ionic *ionic, unsigned int num)
23 {
24 	return pci_irq_vector(ionic->pdev, num);
25 }
26 
27 const char *ionic_bus_info(struct ionic *ionic)
28 {
29 	return pci_name(ionic->pdev);
30 }
31 
32 int ionic_bus_alloc_irq_vectors(struct ionic *ionic, unsigned int nintrs)
33 {
34 	return pci_alloc_irq_vectors(ionic->pdev, nintrs, nintrs,
35 				     PCI_IRQ_MSIX);
36 }
37 
38 void ionic_bus_free_irq_vectors(struct ionic *ionic)
39 {
40 	if (!ionic->nintrs)
41 		return;
42 
43 	pci_free_irq_vectors(ionic->pdev);
44 }
45 
46 static int ionic_map_bars(struct ionic *ionic)
47 {
48 	struct pci_dev *pdev = ionic->pdev;
49 	struct device *dev = ionic->dev;
50 	struct ionic_dev_bar *bars;
51 	unsigned int i, j;
52 
53 	bars = ionic->bars;
54 	ionic->num_bars = 0;
55 
56 	for (i = 0, j = 0; i < IONIC_BARS_MAX; i++) {
57 		if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
58 			continue;
59 		bars[j].len = pci_resource_len(pdev, i);
60 
61 		/* only map the whole bar 0 */
62 		if (j > 0) {
63 			bars[j].vaddr = NULL;
64 		} else {
65 			bars[j].vaddr = pci_iomap(pdev, i, bars[j].len);
66 			if (!bars[j].vaddr) {
67 				dev_err(dev,
68 					"Cannot memory-map BAR %d, aborting\n",
69 					i);
70 				return -ENODEV;
71 			}
72 		}
73 
74 		bars[j].bus_addr = pci_resource_start(pdev, i);
75 		bars[j].res_index = i;
76 		ionic->num_bars++;
77 		j++;
78 	}
79 
80 	return 0;
81 }
82 
83 static void ionic_unmap_bars(struct ionic *ionic)
84 {
85 	struct ionic_dev_bar *bars = ionic->bars;
86 	unsigned int i;
87 
88 	for (i = 0; i < IONIC_BARS_MAX; i++) {
89 		if (bars[i].vaddr) {
90 			iounmap(bars[i].vaddr);
91 			bars[i].bus_addr = 0;
92 			bars[i].vaddr = NULL;
93 			bars[i].len = 0;
94 		}
95 	}
96 }
97 
98 void __iomem *ionic_bus_map_dbpage(struct ionic *ionic, int page_num)
99 {
100 	return pci_iomap_range(ionic->pdev,
101 			       ionic->bars[IONIC_PCI_BAR_DBELL].res_index,
102 			       (u64)page_num << PAGE_SHIFT, PAGE_SIZE);
103 }
104 
105 void ionic_bus_unmap_dbpage(struct ionic *ionic, void __iomem *page)
106 {
107 	iounmap(page);
108 }
109 
110 static void ionic_vf_dealloc_locked(struct ionic *ionic)
111 {
112 	struct ionic_vf_setattr_cmd vfc = { .attr = IONIC_VF_ATTR_STATSADDR };
113 	struct ionic_vf *v;
114 	int i;
115 
116 	if (!ionic->vfs)
117 		return;
118 
119 	for (i = ionic->num_vfs - 1; i >= 0; i--) {
120 		v = &ionic->vfs[i];
121 
122 		if (v->stats_pa) {
123 			vfc.stats_pa = 0;
124 			(void)ionic_set_vf_config(ionic, i, &vfc);
125 			dma_unmap_single(ionic->dev, v->stats_pa,
126 					 sizeof(v->stats), DMA_FROM_DEVICE);
127 			v->stats_pa = 0;
128 		}
129 	}
130 
131 	kfree(ionic->vfs);
132 	ionic->vfs = NULL;
133 	ionic->num_vfs = 0;
134 }
135 
136 static void ionic_vf_dealloc(struct ionic *ionic)
137 {
138 	down_write(&ionic->vf_op_lock);
139 	ionic_vf_dealloc_locked(ionic);
140 	up_write(&ionic->vf_op_lock);
141 }
142 
143 static int ionic_vf_alloc(struct ionic *ionic, int num_vfs)
144 {
145 	struct ionic_vf_setattr_cmd vfc = { .attr = IONIC_VF_ATTR_STATSADDR };
146 	struct ionic_vf *v;
147 	int err = 0;
148 	int i;
149 
150 	down_write(&ionic->vf_op_lock);
151 
152 	ionic->vfs = kcalloc(num_vfs, sizeof(struct ionic_vf), GFP_KERNEL);
153 	if (!ionic->vfs) {
154 		err = -ENOMEM;
155 		goto out;
156 	}
157 
158 	for (i = 0; i < num_vfs; i++) {
159 		v = &ionic->vfs[i];
160 		v->stats_pa = dma_map_single(ionic->dev, &v->stats,
161 					     sizeof(v->stats), DMA_FROM_DEVICE);
162 		if (dma_mapping_error(ionic->dev, v->stats_pa)) {
163 			v->stats_pa = 0;
164 			err = -ENODEV;
165 			goto out;
166 		}
167 
168 		ionic->num_vfs++;
169 
170 		/* ignore failures from older FW, we just won't get stats */
171 		vfc.stats_pa = cpu_to_le64(v->stats_pa);
172 		(void)ionic_set_vf_config(ionic, i, &vfc);
173 	}
174 
175 out:
176 	if (err)
177 		ionic_vf_dealloc_locked(ionic);
178 	up_write(&ionic->vf_op_lock);
179 	return err;
180 }
181 
182 static int ionic_sriov_configure(struct pci_dev *pdev, int num_vfs)
183 {
184 	struct ionic *ionic = pci_get_drvdata(pdev);
185 	struct device *dev = ionic->dev;
186 	int ret = 0;
187 
188 	if (ionic->lif &&
189 	    test_bit(IONIC_LIF_F_FW_RESET, ionic->lif->state))
190 		return -EBUSY;
191 
192 	if (num_vfs > 0) {
193 		ret = pci_enable_sriov(pdev, num_vfs);
194 		if (ret) {
195 			dev_err(dev, "Cannot enable SRIOV: %d\n", ret);
196 			goto out;
197 		}
198 
199 		ret = ionic_vf_alloc(ionic, num_vfs);
200 		if (ret) {
201 			dev_err(dev, "Cannot alloc VFs: %d\n", ret);
202 			pci_disable_sriov(pdev);
203 			goto out;
204 		}
205 
206 		ret = num_vfs;
207 	} else {
208 		pci_disable_sriov(pdev);
209 		ionic_vf_dealloc(ionic);
210 	}
211 
212 out:
213 	return ret;
214 }
215 
216 static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
217 {
218 	struct device *dev = &pdev->dev;
219 	struct ionic *ionic;
220 	int num_vfs;
221 	int err;
222 
223 	ionic = ionic_devlink_alloc(dev);
224 	if (!ionic)
225 		return -ENOMEM;
226 
227 	ionic->pdev = pdev;
228 	ionic->dev = dev;
229 	pci_set_drvdata(pdev, ionic);
230 	mutex_init(&ionic->dev_cmd_lock);
231 
232 	/* Query system for DMA addressing limitation for the device. */
233 	err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(IONIC_ADDR_LEN));
234 	if (err) {
235 		dev_err(dev, "Unable to obtain 64-bit DMA for consistent allocations, aborting.  err=%d\n",
236 			err);
237 		goto err_out_clear_drvdata;
238 	}
239 
240 	ionic_debugfs_add_dev(ionic);
241 
242 	/* Setup PCI device */
243 	err = pci_enable_device_mem(pdev);
244 	if (err) {
245 		dev_err(dev, "Cannot enable PCI device: %d, aborting\n", err);
246 		goto err_out_debugfs_del_dev;
247 	}
248 
249 	err = pci_request_regions(pdev, IONIC_DRV_NAME);
250 	if (err) {
251 		dev_err(dev, "Cannot request PCI regions: %d, aborting\n", err);
252 		goto err_out_pci_disable_device;
253 	}
254 
255 	pcie_print_link_status(pdev);
256 
257 	err = ionic_map_bars(ionic);
258 	if (err)
259 		goto err_out_pci_release_regions;
260 
261 	/* Configure the device */
262 	err = ionic_setup(ionic);
263 	if (err) {
264 		dev_err(dev, "Cannot setup device: %d, aborting\n", err);
265 		goto err_out_unmap_bars;
266 	}
267 	pci_set_master(pdev);
268 
269 	err = ionic_identify(ionic);
270 	if (err) {
271 		dev_err(dev, "Cannot identify device: %d, aborting\n", err);
272 		goto err_out_teardown;
273 	}
274 	ionic_debugfs_add_ident(ionic);
275 
276 	err = ionic_init(ionic);
277 	if (err) {
278 		dev_err(dev, "Cannot init device: %d, aborting\n", err);
279 		goto err_out_teardown;
280 	}
281 
282 	/* Configure the ports */
283 	err = ionic_port_identify(ionic);
284 	if (err) {
285 		dev_err(dev, "Cannot identify port: %d, aborting\n", err);
286 		goto err_out_reset;
287 	}
288 
289 	err = ionic_port_init(ionic);
290 	if (err) {
291 		dev_err(dev, "Cannot init port: %d, aborting\n", err);
292 		goto err_out_reset;
293 	}
294 
295 	/* Allocate and init the LIF */
296 	err = ionic_lif_size(ionic);
297 	if (err) {
298 		dev_err(dev, "Cannot size LIF: %d, aborting\n", err);
299 		goto err_out_port_reset;
300 	}
301 
302 	err = ionic_lif_alloc(ionic);
303 	if (err) {
304 		dev_err(dev, "Cannot allocate LIF: %d, aborting\n", err);
305 		goto err_out_free_irqs;
306 	}
307 
308 	err = ionic_lif_init(ionic->lif);
309 	if (err) {
310 		dev_err(dev, "Cannot init LIF: %d, aborting\n", err);
311 		goto err_out_free_lifs;
312 	}
313 
314 	init_rwsem(&ionic->vf_op_lock);
315 	num_vfs = pci_num_vf(pdev);
316 	if (num_vfs) {
317 		dev_info(dev, "%d VFs found already enabled\n", num_vfs);
318 		err = ionic_vf_alloc(ionic, num_vfs);
319 		if (err)
320 			dev_err(dev, "Cannot enable existing VFs: %d\n", err);
321 	}
322 
323 	err = ionic_devlink_register(ionic);
324 	if (err) {
325 		dev_err(dev, "Cannot register devlink: %d\n", err);
326 		goto err_out_deinit_lifs;
327 	}
328 
329 	err = ionic_lif_register(ionic->lif);
330 	if (err) {
331 		dev_err(dev, "Cannot register LIF: %d, aborting\n", err);
332 		goto err_out_deregister_devlink;
333 	}
334 
335 	mod_timer(&ionic->watchdog_timer,
336 		  round_jiffies(jiffies + ionic->watchdog_period));
337 
338 	return 0;
339 
340 err_out_deregister_devlink:
341 	ionic_devlink_unregister(ionic);
342 err_out_deinit_lifs:
343 	ionic_vf_dealloc(ionic);
344 	ionic_lif_deinit(ionic->lif);
345 err_out_free_lifs:
346 	ionic_lif_free(ionic->lif);
347 	ionic->lif = NULL;
348 err_out_free_irqs:
349 	ionic_bus_free_irq_vectors(ionic);
350 err_out_port_reset:
351 	ionic_port_reset(ionic);
352 err_out_reset:
353 	ionic_reset(ionic);
354 err_out_teardown:
355 	pci_clear_master(pdev);
356 	/* Don't fail the probe for these errors, keep
357 	 * the hw interface around for inspection
358 	 */
359 	return 0;
360 
361 err_out_unmap_bars:
362 	ionic_unmap_bars(ionic);
363 err_out_pci_release_regions:
364 	pci_release_regions(pdev);
365 err_out_pci_disable_device:
366 	pci_disable_device(pdev);
367 err_out_debugfs_del_dev:
368 	ionic_debugfs_del_dev(ionic);
369 err_out_clear_drvdata:
370 	mutex_destroy(&ionic->dev_cmd_lock);
371 	ionic_devlink_free(ionic);
372 
373 	return err;
374 }
375 
376 static void ionic_remove(struct pci_dev *pdev)
377 {
378 	struct ionic *ionic = pci_get_drvdata(pdev);
379 
380 	del_timer_sync(&ionic->watchdog_timer);
381 
382 	if (ionic->lif) {
383 		ionic_lif_unregister(ionic->lif);
384 		ionic_devlink_unregister(ionic);
385 		ionic_lif_deinit(ionic->lif);
386 		ionic_lif_free(ionic->lif);
387 		ionic->lif = NULL;
388 		ionic_bus_free_irq_vectors(ionic);
389 	}
390 
391 	ionic_port_reset(ionic);
392 	ionic_reset(ionic);
393 	pci_clear_master(pdev);
394 	ionic_unmap_bars(ionic);
395 	pci_release_regions(pdev);
396 	pci_disable_device(pdev);
397 	ionic_debugfs_del_dev(ionic);
398 	mutex_destroy(&ionic->dev_cmd_lock);
399 	ionic_devlink_free(ionic);
400 }
401 
402 static struct pci_driver ionic_driver = {
403 	.name = IONIC_DRV_NAME,
404 	.id_table = ionic_id_table,
405 	.probe = ionic_probe,
406 	.remove = ionic_remove,
407 	.sriov_configure = ionic_sriov_configure,
408 };
409 
410 int ionic_bus_register_driver(void)
411 {
412 	return pci_register_driver(&ionic_driver);
413 }
414 
415 void ionic_bus_unregister_driver(void)
416 {
417 	pci_unregister_driver(&ionic_driver);
418 }
419