xref: /openbmc/linux/drivers/fpga/dfl-fme-pr.c (revision 31d5f934) 
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Driver for FPGA Management Engine (FME) Partial Reconfiguration
4  *
5  * Copyright (C) 2017-2018 Intel Corporation, Inc.
6  *
7  * Authors:
8  *   Kang Luwei <luwei.kang@intel.com>
9  *   Xiao Guangrong <guangrong.xiao@linux.intel.com>
10  *   Wu Hao <hao.wu@intel.com>
11  *   Joseph Grecco <joe.grecco@intel.com>
12  *   Enno Luebbers <enno.luebbers@intel.com>
13  *   Tim Whisonant <tim.whisonant@intel.com>
14  *   Ananda Ravuri <ananda.ravuri@intel.com>
15  *   Christopher Rauer <christopher.rauer@intel.com>
16  *   Henry Mitchel <henry.mitchel@intel.com>
17  */
18 
19 #include <linux/types.h>
20 #include <linux/device.h>
21 #include <linux/vmalloc.h>
22 #include <linux/uaccess.h>
23 #include <linux/fpga/fpga-mgr.h>
24 #include <linux/fpga/fpga-bridge.h>
25 #include <linux/fpga/fpga-region.h>
26 #include <linux/fpga-dfl.h>
27 
28 #include "dfl.h"
29 #include "dfl-fme.h"
30 #include "dfl-fme-pr.h"
31 
32 static struct dfl_fme_region *
33 dfl_fme_region_find_by_port_id(struct dfl_fme *fme, int port_id)
34 {
35 	struct dfl_fme_region *fme_region;
36 
37 	list_for_each_entry(fme_region, &fme->region_list, node)
38 		if (fme_region->port_id == port_id)
39 			return fme_region;
40 
41 	return NULL;
42 }
43 
44 static int dfl_fme_region_match(struct device *dev, const void *data)
45 {
46 	return dev->parent == data;
47 }
48 
49 static struct fpga_region *dfl_fme_region_find(struct dfl_fme *fme, int port_id)
50 {
51 	struct dfl_fme_region *fme_region;
52 	struct fpga_region *region;
53 
54 	fme_region = dfl_fme_region_find_by_port_id(fme, port_id);
55 	if (!fme_region)
56 		return NULL;
57 
58 	region = fpga_region_class_find(NULL, &fme_region->region->dev,
59 					dfl_fme_region_match);
60 	if (!region)
61 		return NULL;
62 
63 	return region;
64 }
65 
66 static int fme_pr(struct platform_device *pdev, unsigned long arg)
67 {
68 	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
69 	void __user *argp = (void __user *)arg;
70 	struct dfl_fpga_fme_port_pr port_pr;
71 	struct fpga_image_info *info;
72 	struct fpga_region *region;
73 	void __iomem *fme_hdr;
74 	struct dfl_fme *fme;
75 	unsigned long minsz;
76 	void *buf = NULL;
77 	size_t length;
78 	int ret = 0;
79 	u64 v;
80 
81 	minsz = offsetofend(struct dfl_fpga_fme_port_pr, buffer_address);
82 
83 	if (copy_from_user(&port_pr, argp, minsz))
84 		return -EFAULT;
85 
86 	if (port_pr.argsz < minsz || port_pr.flags)
87 		return -EINVAL;
88 
89 	/* get fme header region */
90 	fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
91 					       FME_FEATURE_ID_HEADER);
92 
93 	/* check port id */
94 	v = readq(fme_hdr + FME_HDR_CAP);
95 	if (port_pr.port_id >= FIELD_GET(FME_CAP_NUM_PORTS, v)) {
96 		dev_dbg(&pdev->dev, "port number more than maximum\n");
97 		return -EINVAL;
98 	}
99 
100 	/*
101 	 * align PR buffer per PR bandwidth, as HW ignores the extra padding
102 	 * data automatically.
103 	 */
104 	length = ALIGN(port_pr.buffer_size, 4);
105 
106 	buf = vmalloc(length);
107 	if (!buf)
108 		return -ENOMEM;
109 
110 	if (copy_from_user(buf,
111 			   (void __user *)(unsigned long)port_pr.buffer_address,
112 			   port_pr.buffer_size)) {
113 		ret = -EFAULT;
114 		goto free_exit;
115 	}
116 
117 	/* prepare fpga_image_info for PR */
118 	info = fpga_image_info_alloc(&pdev->dev);
119 	if (!info) {
120 		ret = -ENOMEM;
121 		goto free_exit;
122 	}
123 
124 	info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
125 
126 	mutex_lock(&pdata->lock);
127 	fme = dfl_fpga_pdata_get_private(pdata);
128 	/* fme device has been unregistered. */
129 	if (!fme) {
130 		ret = -EINVAL;
131 		goto unlock_exit;
132 	}
133 
134 	region = dfl_fme_region_find(fme, port_pr.port_id);
135 	if (!region) {
136 		ret = -EINVAL;
137 		goto unlock_exit;
138 	}
139 
140 	fpga_image_info_free(region->info);
141 
142 	info->buf = buf;
143 	info->count = length;
144 	info->region_id = port_pr.port_id;
145 	region->info = info;
146 
147 	ret = fpga_region_program_fpga(region);
148 
149 	/*
150 	 * it allows userspace to reset the PR region's logic by disabling and
151 	 * reenabling the bridge to clear things out between acceleration runs.
152 	 * so no need to hold the bridges after partial reconfiguration.
153 	 */
154 	if (region->get_bridges)
155 		fpga_bridges_put(&region->bridge_list);
156 
157 	put_device(&region->dev);
158 unlock_exit:
159 	mutex_unlock(&pdata->lock);
160 free_exit:
161 	vfree(buf);
162 	return ret;
163 }
164 
165 /**
166  * dfl_fme_create_mgr - create fpga mgr platform device as child device
167  * @feature: sub feature info
168  * @pdata: fme platform_device's pdata
169  *
170  * Return: mgr platform device if successful, and error code otherwise.
171  */
172 static struct platform_device *
173 dfl_fme_create_mgr(struct dfl_feature_platform_data *pdata,
174 		   struct dfl_feature *feature)
175 {
176 	struct platform_device *mgr, *fme = pdata->dev;
177 	struct dfl_fme_mgr_pdata mgr_pdata;
178 	int ret = -ENOMEM;
179 
180 	if (!feature->ioaddr)
181 		return ERR_PTR(-ENODEV);
182 
183 	mgr_pdata.ioaddr = feature->ioaddr;
184 
185 	/*
186 	 * Each FME has only one fpga-mgr, so allocate platform device using
187 	 * the same FME platform device id.
188 	 */
189 	mgr = platform_device_alloc(DFL_FPGA_FME_MGR, fme->id);
190 	if (!mgr)
191 		return ERR_PTR(ret);
192 
193 	mgr->dev.parent = &fme->dev;
194 
195 	ret = platform_device_add_data(mgr, &mgr_pdata, sizeof(mgr_pdata));
196 	if (ret)
197 		goto create_mgr_err;
198 
199 	ret = platform_device_add(mgr);
200 	if (ret)
201 		goto create_mgr_err;
202 
203 	return mgr;
204 
205 create_mgr_err:
206 	platform_device_put(mgr);
207 	return ERR_PTR(ret);
208 }
209 
210 /**
211  * dfl_fme_destroy_mgr - destroy fpga mgr platform device
212  * @pdata: fme platform device's pdata
213  */
214 static void dfl_fme_destroy_mgr(struct dfl_feature_platform_data *pdata)
215 {
216 	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
217 
218 	platform_device_unregister(priv->mgr);
219 }
220 
221 /**
222  * dfl_fme_create_bridge - create fme fpga bridge platform device as child
223  *
224  * @pdata: fme platform device's pdata
225  * @port_id: port id for the bridge to be created.
226  *
227  * Return: bridge platform device if successful, and error code otherwise.
228  */
229 static struct dfl_fme_bridge *
230 dfl_fme_create_bridge(struct dfl_feature_platform_data *pdata, int port_id)
231 {
232 	struct device *dev = &pdata->dev->dev;
233 	struct dfl_fme_br_pdata br_pdata;
234 	struct dfl_fme_bridge *fme_br;
235 	int ret = -ENOMEM;
236 
237 	fme_br = devm_kzalloc(dev, sizeof(*fme_br), GFP_KERNEL);
238 	if (!fme_br)
239 		return ERR_PTR(ret);
240 
241 	br_pdata.cdev = pdata->dfl_cdev;
242 	br_pdata.port_id = port_id;
243 
244 	fme_br->br = platform_device_alloc(DFL_FPGA_FME_BRIDGE,
245 					   PLATFORM_DEVID_AUTO);
246 	if (!fme_br->br)
247 		return ERR_PTR(ret);
248 
249 	fme_br->br->dev.parent = dev;
250 
251 	ret = platform_device_add_data(fme_br->br, &br_pdata, sizeof(br_pdata));
252 	if (ret)
253 		goto create_br_err;
254 
255 	ret = platform_device_add(fme_br->br);
256 	if (ret)
257 		goto create_br_err;
258 
259 	return fme_br;
260 
261 create_br_err:
262 	platform_device_put(fme_br->br);
263 	return ERR_PTR(ret);
264 }
265 
266 /**
267  * dfl_fme_destroy_bridge - destroy fpga bridge platform device
268  * @fme_br: fme bridge to destroy
269  */
270 static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br)
271 {
272 	platform_device_unregister(fme_br->br);
273 }
274 
275 /**
276  * dfl_fme_destroy_bridges - destroy all fpga bridge platform device
277  * @pdata: fme platform device's pdata
278  */
279 static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata)
280 {
281 	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
282 	struct dfl_fme_bridge *fbridge, *tmp;
283 
284 	list_for_each_entry_safe(fbridge, tmp, &priv->bridge_list, node) {
285 		list_del(&fbridge->node);
286 		dfl_fme_destroy_bridge(fbridge);
287 	}
288 }
289 
290 /**
291  * dfl_fme_create_region - create fpga region platform device as child
292  *
293  * @pdata: fme platform device's pdata
294  * @mgr: mgr platform device needed for region
295  * @br: br platform device needed for region
296  * @port_id: port id
297  *
298  * Return: fme region if successful, and error code otherwise.
299  */
300 static struct dfl_fme_region *
301 dfl_fme_create_region(struct dfl_feature_platform_data *pdata,
302 		      struct platform_device *mgr,
303 		      struct platform_device *br, int port_id)
304 {
305 	struct dfl_fme_region_pdata region_pdata;
306 	struct device *dev = &pdata->dev->dev;
307 	struct dfl_fme_region *fme_region;
308 	int ret = -ENOMEM;
309 
310 	fme_region = devm_kzalloc(dev, sizeof(*fme_region), GFP_KERNEL);
311 	if (!fme_region)
312 		return ERR_PTR(ret);
313 
314 	region_pdata.mgr = mgr;
315 	region_pdata.br = br;
316 
317 	/*
318 	 * Each FPGA device may have more than one port, so allocate platform
319 	 * device using the same port platform device id.
320 	 */
321 	fme_region->region = platform_device_alloc(DFL_FPGA_FME_REGION, br->id);
322 	if (!fme_region->region)
323 		return ERR_PTR(ret);
324 
325 	fme_region->region->dev.parent = dev;
326 
327 	ret = platform_device_add_data(fme_region->region, &region_pdata,
328 				       sizeof(region_pdata));
329 	if (ret)
330 		goto create_region_err;
331 
332 	ret = platform_device_add(fme_region->region);
333 	if (ret)
334 		goto create_region_err;
335 
336 	fme_region->port_id = port_id;
337 
338 	return fme_region;
339 
340 create_region_err:
341 	platform_device_put(fme_region->region);
342 	return ERR_PTR(ret);
343 }
344 
345 /**
346  * dfl_fme_destroy_region - destroy fme region
347  * @fme_region: fme region to destroy
348  */
349 static void dfl_fme_destroy_region(struct dfl_fme_region *fme_region)
350 {
351 	platform_device_unregister(fme_region->region);
352 }
353 
354 /**
355  * dfl_fme_destroy_regions - destroy all fme regions
356  * @pdata: fme platform device's pdata
357  */
358 static void dfl_fme_destroy_regions(struct dfl_feature_platform_data *pdata)
359 {
360 	struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
361 	struct dfl_fme_region *fme_region, *tmp;
362 
363 	list_for_each_entry_safe(fme_region, tmp, &priv->region_list, node) {
364 		list_del(&fme_region->node);
365 		dfl_fme_destroy_region(fme_region);
366 	}
367 }
368 
369 static int pr_mgmt_init(struct platform_device *pdev,
370 			struct dfl_feature *feature)
371 {
372 	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
373 	struct dfl_fme_region *fme_region;
374 	struct dfl_fme_bridge *fme_br;
375 	struct platform_device *mgr;
376 	struct dfl_fme *priv;
377 	void __iomem *fme_hdr;
378 	int ret = -ENODEV, i = 0;
379 	u64 fme_cap, port_offset;
380 
381 	fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
382 					       FME_FEATURE_ID_HEADER);
383 
384 	mutex_lock(&pdata->lock);
385 	priv = dfl_fpga_pdata_get_private(pdata);
386 
387 	/* Initialize the region and bridge sub device list */
388 	INIT_LIST_HEAD(&priv->region_list);
389 	INIT_LIST_HEAD(&priv->bridge_list);
390 
391 	/* Create fpga mgr platform device */
392 	mgr = dfl_fme_create_mgr(pdata, feature);
393 	if (IS_ERR(mgr)) {
394 		dev_err(&pdev->dev, "fail to create fpga mgr pdev\n");
395 		goto unlock;
396 	}
397 
398 	priv->mgr = mgr;
399 
400 	/* Read capability register to check number of regions and bridges */
401 	fme_cap = readq(fme_hdr + FME_HDR_CAP);
402 	for (; i < FIELD_GET(FME_CAP_NUM_PORTS, fme_cap); i++) {
403 		port_offset = readq(fme_hdr + FME_HDR_PORT_OFST(i));
404 		if (!(port_offset & FME_PORT_OFST_IMP))
405 			continue;
406 
407 		/* Create bridge for each port */
408 		fme_br = dfl_fme_create_bridge(pdata, i);
409 		if (IS_ERR(fme_br)) {
410 			ret = PTR_ERR(fme_br);
411 			goto destroy_region;
412 		}
413 
414 		list_add(&fme_br->node, &priv->bridge_list);
415 
416 		/* Create region for each port */
417 		fme_region = dfl_fme_create_region(pdata, mgr,
418 						   fme_br->br, i);
419 		if (IS_ERR(fme_region)) {
420 			ret = PTR_ERR(fme_region);
421 			goto destroy_region;
422 		}
423 
424 		list_add(&fme_region->node, &priv->region_list);
425 	}
426 	mutex_unlock(&pdata->lock);
427 
428 	return 0;
429 
430 destroy_region:
431 	dfl_fme_destroy_regions(pdata);
432 	dfl_fme_destroy_bridges(pdata);
433 	dfl_fme_destroy_mgr(pdata);
434 unlock:
435 	mutex_unlock(&pdata->lock);
436 	return ret;
437 }
438 
439 static void pr_mgmt_uinit(struct platform_device *pdev,
440 			  struct dfl_feature *feature)
441 {
442 	struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
443 
444 	mutex_lock(&pdata->lock);
445 
446 	dfl_fme_destroy_regions(pdata);
447 	dfl_fme_destroy_bridges(pdata);
448 	dfl_fme_destroy_mgr(pdata);
449 	mutex_unlock(&pdata->lock);
450 }
451 
452 static long fme_pr_ioctl(struct platform_device *pdev,
453 			 struct dfl_feature *feature,
454 			 unsigned int cmd, unsigned long arg)
455 {
456 	long ret;
457 
458 	switch (cmd) {
459 	case DFL_FPGA_FME_PORT_PR:
460 		ret = fme_pr(pdev, arg);
461 		break;
462 	default:
463 		ret = -ENODEV;
464 	}
465 
466 	return ret;
467 }
468 
469 const struct dfl_feature_id fme_pr_mgmt_id_table[] = {
470 	{.id = FME_FEATURE_ID_PR_MGMT,},
471 	{0}
472 };
473 
474 const struct dfl_feature_ops fme_pr_mgmt_ops = {
475 	.init = pr_mgmt_init,
476 	.uinit = pr_mgmt_uinit,
477 	.ioctl = fme_pr_ioctl,
478 };
479