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 *v;
113 	dma_addr_t dma = 0;
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 			(void)ionic_set_vf_config(ionic, i,
124 						  IONIC_VF_ATTR_STATSADDR,
125 						  (u8 *)&dma);
126 			dma_unmap_single(ionic->dev, v->stats_pa,
127 					 sizeof(v->stats), DMA_FROM_DEVICE);
128 			v->stats_pa = 0;
129 		}
130 	}
131 
132 	kfree(ionic->vfs);
133 	ionic->vfs = NULL;
134 	ionic->num_vfs = 0;
135 }
136 
137 static void ionic_vf_dealloc(struct ionic *ionic)
138 {
139 	down_write(&ionic->vf_op_lock);
140 	ionic_vf_dealloc_locked(ionic);
141 	up_write(&ionic->vf_op_lock);
142 }
143 
144 static int ionic_vf_alloc(struct ionic *ionic, int num_vfs)
145 {
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 		/* ignore failures from older FW, we just won't get stats */
169 		(void)ionic_set_vf_config(ionic, i, IONIC_VF_ATTR_STATSADDR,
170 					  (u8 *)&v->stats_pa);
171 		ionic->num_vfs++;
172 	}
173 
174 out:
175 	if (err)
176 		ionic_vf_dealloc_locked(ionic);
177 	up_write(&ionic->vf_op_lock);
178 	return err;
179 }
180 
181 static int ionic_sriov_configure(struct pci_dev *pdev, int num_vfs)
182 {
183 	struct ionic *ionic = pci_get_drvdata(pdev);
184 	struct device *dev = ionic->dev;
185 	int ret = 0;
186 
187 	if (num_vfs > 0) {
188 		ret = pci_enable_sriov(pdev, num_vfs);
189 		if (ret) {
190 			dev_err(dev, "Cannot enable SRIOV: %d\n", ret);
191 			goto out;
192 		}
193 
194 		ret = ionic_vf_alloc(ionic, num_vfs);
195 		if (ret) {
196 			dev_err(dev, "Cannot alloc VFs: %d\n", ret);
197 			pci_disable_sriov(pdev);
198 			goto out;
199 		}
200 
201 		ret = num_vfs;
202 	} else {
203 		pci_disable_sriov(pdev);
204 		ionic_vf_dealloc(ionic);
205 	}
206 
207 out:
208 	return ret;
209 }
210 
211 static int ionic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
212 {
213 	struct device *dev = &pdev->dev;
214 	struct ionic *ionic;
215 	int num_vfs;
216 	int err;
217 
218 	ionic = ionic_devlink_alloc(dev);
219 	if (!ionic)
220 		return -ENOMEM;
221 
222 	ionic->pdev = pdev;
223 	ionic->dev = dev;
224 	pci_set_drvdata(pdev, ionic);
225 	mutex_init(&ionic->dev_cmd_lock);
226 
227 	/* Query system for DMA addressing limitation for the device. */
228 	err = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(IONIC_ADDR_LEN));
229 	if (err) {
230 		dev_err(dev, "Unable to obtain 64-bit DMA for consistent allocations, aborting.  err=%d\n",
231 			err);
232 		goto err_out_clear_drvdata;
233 	}
234 
235 	ionic_debugfs_add_dev(ionic);
236 
237 	/* Setup PCI device */
238 	err = pci_enable_device_mem(pdev);
239 	if (err) {
240 		dev_err(dev, "Cannot enable PCI device: %d, aborting\n", err);
241 		goto err_out_debugfs_del_dev;
242 	}
243 
244 	err = pci_request_regions(pdev, IONIC_DRV_NAME);
245 	if (err) {
246 		dev_err(dev, "Cannot request PCI regions: %d, aborting\n", err);
247 		goto err_out_pci_disable_device;
248 	}
249 
250 	pcie_print_link_status(pdev);
251 
252 	err = ionic_map_bars(ionic);
253 	if (err)
254 		goto err_out_pci_disable_device;
255 
256 	/* Configure the device */
257 	err = ionic_setup(ionic);
258 	if (err) {
259 		dev_err(dev, "Cannot setup device: %d, aborting\n", err);
260 		goto err_out_unmap_bars;
261 	}
262 	pci_set_master(pdev);
263 
264 	err = ionic_identify(ionic);
265 	if (err) {
266 		dev_err(dev, "Cannot identify device: %d, aborting\n", err);
267 		goto err_out_teardown;
268 	}
269 	ionic_debugfs_add_ident(ionic);
270 
271 	err = ionic_init(ionic);
272 	if (err) {
273 		dev_err(dev, "Cannot init device: %d, aborting\n", err);
274 		goto err_out_teardown;
275 	}
276 
277 	/* Configure the ports */
278 	err = ionic_port_identify(ionic);
279 	if (err) {
280 		dev_err(dev, "Cannot identify port: %d, aborting\n", err);
281 		goto err_out_reset;
282 	}
283 
284 	err = ionic_port_init(ionic);
285 	if (err) {
286 		dev_err(dev, "Cannot init port: %d, aborting\n", err);
287 		goto err_out_reset;
288 	}
289 
290 	/* Allocate and init the LIF */
291 	err = ionic_lif_size(ionic);
292 	if (err) {
293 		dev_err(dev, "Cannot size LIF: %d, aborting\n", err);
294 		goto err_out_port_reset;
295 	}
296 
297 	err = ionic_lif_alloc(ionic);
298 	if (err) {
299 		dev_err(dev, "Cannot allocate LIF: %d, aborting\n", err);
300 		goto err_out_free_irqs;
301 	}
302 
303 	err = ionic_lif_init(ionic->lif);
304 	if (err) {
305 		dev_err(dev, "Cannot init LIF: %d, aborting\n", err);
306 		goto err_out_free_lifs;
307 	}
308 
309 	init_rwsem(&ionic->vf_op_lock);
310 	num_vfs = pci_num_vf(pdev);
311 	if (num_vfs) {
312 		dev_info(dev, "%d VFs found already enabled\n", num_vfs);
313 		err = ionic_vf_alloc(ionic, num_vfs);
314 		if (err)
315 			dev_err(dev, "Cannot enable existing VFs: %d\n", err);
316 	}
317 
318 	err = ionic_lif_register(ionic->lif);
319 	if (err) {
320 		dev_err(dev, "Cannot register LIF: %d, aborting\n", err);
321 		goto err_out_deinit_lifs;
322 	}
323 
324 	err = ionic_devlink_register(ionic);
325 	if (err) {
326 		dev_err(dev, "Cannot register devlink: %d\n", err);
327 		goto err_out_deregister_lifs;
328 	}
329 
330 	return 0;
331 
332 err_out_deregister_lifs:
333 	ionic_lif_unregister(ionic->lif);
334 err_out_deinit_lifs:
335 	ionic_vf_dealloc(ionic);
336 	ionic_lif_deinit(ionic->lif);
337 err_out_free_lifs:
338 	ionic_lif_free(ionic->lif);
339 	ionic->lif = NULL;
340 err_out_free_irqs:
341 	ionic_bus_free_irq_vectors(ionic);
342 err_out_port_reset:
343 	ionic_port_reset(ionic);
344 err_out_reset:
345 	ionic_reset(ionic);
346 err_out_teardown:
347 	del_timer_sync(&ionic->watchdog_timer);
348 	pci_clear_master(pdev);
349 	/* Don't fail the probe for these errors, keep
350 	 * the hw interface around for inspection
351 	 */
352 	return 0;
353 
354 err_out_unmap_bars:
355 	ionic_unmap_bars(ionic);
356 	pci_release_regions(pdev);
357 err_out_pci_disable_device:
358 	pci_disable_device(pdev);
359 err_out_debugfs_del_dev:
360 	ionic_debugfs_del_dev(ionic);
361 err_out_clear_drvdata:
362 	mutex_destroy(&ionic->dev_cmd_lock);
363 	ionic_devlink_free(ionic);
364 
365 	return err;
366 }
367 
368 static void ionic_remove(struct pci_dev *pdev)
369 {
370 	struct ionic *ionic = pci_get_drvdata(pdev);
371 
372 	if (!ionic)
373 		return;
374 
375 	del_timer_sync(&ionic->watchdog_timer);
376 
377 	if (ionic->lif) {
378 		ionic_devlink_unregister(ionic);
379 		ionic_lif_unregister(ionic->lif);
380 		ionic_lif_deinit(ionic->lif);
381 		ionic_lif_free(ionic->lif);
382 		ionic->lif = NULL;
383 		ionic_bus_free_irq_vectors(ionic);
384 	}
385 
386 	ionic_port_reset(ionic);
387 	ionic_reset(ionic);
388 	pci_clear_master(pdev);
389 	ionic_unmap_bars(ionic);
390 	pci_release_regions(pdev);
391 	pci_disable_device(pdev);
392 	ionic_debugfs_del_dev(ionic);
393 	mutex_destroy(&ionic->dev_cmd_lock);
394 	ionic_devlink_free(ionic);
395 }
396 
397 static struct pci_driver ionic_driver = {
398 	.name = IONIC_DRV_NAME,
399 	.id_table = ionic_id_table,
400 	.probe = ionic_probe,
401 	.remove = ionic_remove,
402 	.sriov_configure = ionic_sriov_configure,
403 };
404 
405 int ionic_bus_register_driver(void)
406 {
407 	return pci_register_driver(&ionic_driver);
408 }
409 
410 void ionic_bus_unregister_driver(void)
411 {
412 	pci_unregister_driver(&ionic_driver);
413 }
414