1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for FPGA Management Engine (FME) Partial Reconfiguration
5 * Copyright (C) 2017-2018 Intel Corporation, Inc.
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>
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>
30 #include "dfl-fme-pr.h"
32 static struct dfl_fme_region *
33 dfl_fme_region_find_by_port_id(struct dfl_fme *fme, int port_id)
35 struct dfl_fme_region *fme_region;
37 list_for_each_entry(fme_region, &fme->region_list, node)
38 if (fme_region->port_id == port_id)
44 static int dfl_fme_region_match(struct device *dev, const void *data)
46 return dev->parent == data;
49 static struct fpga_region *dfl_fme_region_find(struct dfl_fme *fme, int port_id)
51 struct dfl_fme_region *fme_region;
52 struct fpga_region *region;
54 fme_region = dfl_fme_region_find_by_port_id(fme, port_id);
58 region = fpga_region_class_find(NULL, &fme_region->region->dev,
59 dfl_fme_region_match);
66 static int fme_pr(struct platform_device *pdev, unsigned long arg)
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;
81 minsz = offsetofend(struct dfl_fpga_fme_port_pr, buffer_address);
83 if (copy_from_user(&port_pr, argp, minsz))
86 if (port_pr.argsz < minsz || port_pr.flags)
89 /* get fme header region */
90 fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
91 FME_FEATURE_ID_HEADER);
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");
101 * align PR buffer per PR bandwidth, as HW ignores the extra padding
102 * data automatically.
104 length = ALIGN(port_pr.buffer_size, 4);
106 buf = vmalloc(length);
110 if (copy_from_user(buf,
111 (void __user *)(unsigned long)port_pr.buffer_address,
112 port_pr.buffer_size)) {
117 /* prepare fpga_image_info for PR */
118 info = fpga_image_info_alloc(&pdev->dev);
124 info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
126 mutex_lock(&pdata->lock);
127 fme = dfl_fpga_pdata_get_private(pdata);
128 /* fme device has been unregistered. */
134 region = dfl_fme_region_find(fme, port_pr.port_id);
140 fpga_image_info_free(region->info);
143 info->count = length;
144 info->region_id = port_pr.port_id;
147 ret = fpga_region_program_fpga(region);
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.
154 if (region->get_bridges)
155 fpga_bridges_put(®ion->bridge_list);
157 put_device(®ion->dev);
159 mutex_unlock(&pdata->lock);
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
170 * Return: mgr platform device if successful, and error code otherwise.
172 static struct platform_device *
173 dfl_fme_create_mgr(struct dfl_feature_platform_data *pdata,
174 struct dfl_feature *feature)
176 struct platform_device *mgr, *fme = pdata->dev;
177 struct dfl_fme_mgr_pdata mgr_pdata;
180 if (!feature->ioaddr)
181 return ERR_PTR(-ENODEV);
183 mgr_pdata.ioaddr = feature->ioaddr;
186 * Each FME has only one fpga-mgr, so allocate platform device using
187 * the same FME platform device id.
189 mgr = platform_device_alloc(DFL_FPGA_FME_MGR, fme->id);
193 mgr->dev.parent = &fme->dev;
195 ret = platform_device_add_data(mgr, &mgr_pdata, sizeof(mgr_pdata));
199 ret = platform_device_add(mgr);
206 platform_device_put(mgr);
211 * dfl_fme_destroy_mgr - destroy fpga mgr platform device
212 * @pdata: fme platform device's pdata
214 static void dfl_fme_destroy_mgr(struct dfl_feature_platform_data *pdata)
216 struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
218 platform_device_unregister(priv->mgr);
222 * dfl_fme_create_bridge - create fme fpga bridge platform device as child
224 * @pdata: fme platform device's pdata
225 * @port_id: port id for the bridge to be created.
227 * Return: bridge platform device if successful, and error code otherwise.
229 static struct dfl_fme_bridge *
230 dfl_fme_create_bridge(struct dfl_feature_platform_data *pdata, int port_id)
232 struct device *dev = &pdata->dev->dev;
233 struct dfl_fme_br_pdata br_pdata;
234 struct dfl_fme_bridge *fme_br;
237 fme_br = devm_kzalloc(dev, sizeof(*fme_br), GFP_KERNEL);
241 br_pdata.cdev = pdata->dfl_cdev;
242 br_pdata.port_id = port_id;
244 fme_br->br = platform_device_alloc(DFL_FPGA_FME_BRIDGE,
245 PLATFORM_DEVID_AUTO);
249 fme_br->br->dev.parent = dev;
251 ret = platform_device_add_data(fme_br->br, &br_pdata, sizeof(br_pdata));
255 ret = platform_device_add(fme_br->br);
262 platform_device_put(fme_br->br);
267 * dfl_fme_destroy_bridge - destroy fpga bridge platform device
268 * @fme_br: fme bridge to destroy
270 static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br)
272 platform_device_unregister(fme_br->br);
276 * dfl_fme_destroy_bridges - destroy all fpga bridge platform device
277 * @pdata: fme platform device's pdata
279 static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata)
281 struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
282 struct dfl_fme_bridge *fbridge, *tmp;
284 list_for_each_entry_safe(fbridge, tmp, &priv->bridge_list, node) {
285 list_del(&fbridge->node);
286 dfl_fme_destroy_bridge(fbridge);
291 * dfl_fme_create_region - create fpga region platform device as child
293 * @pdata: fme platform device's pdata
294 * @mgr: mgr platform device needed for region
295 * @br: br platform device needed for region
298 * Return: fme region if successful, and error code otherwise.
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)
305 struct dfl_fme_region_pdata region_pdata;
306 struct device *dev = &pdata->dev->dev;
307 struct dfl_fme_region *fme_region;
310 fme_region = devm_kzalloc(dev, sizeof(*fme_region), GFP_KERNEL);
314 region_pdata.mgr = mgr;
315 region_pdata.br = br;
318 * Each FPGA device may have more than one port, so allocate platform
319 * device using the same port platform device id.
321 fme_region->region = platform_device_alloc(DFL_FPGA_FME_REGION, br->id);
322 if (!fme_region->region)
325 fme_region->region->dev.parent = dev;
327 ret = platform_device_add_data(fme_region->region, ®ion_pdata,
328 sizeof(region_pdata));
330 goto create_region_err;
332 ret = platform_device_add(fme_region->region);
334 goto create_region_err;
336 fme_region->port_id = port_id;
341 platform_device_put(fme_region->region);
346 * dfl_fme_destroy_region - destroy fme region
347 * @fme_region: fme region to destroy
349 static void dfl_fme_destroy_region(struct dfl_fme_region *fme_region)
351 platform_device_unregister(fme_region->region);
355 * dfl_fme_destroy_regions - destroy all fme regions
356 * @pdata: fme platform device's pdata
358 static void dfl_fme_destroy_regions(struct dfl_feature_platform_data *pdata)
360 struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
361 struct dfl_fme_region *fme_region, *tmp;
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);
369 static int pr_mgmt_init(struct platform_device *pdev,
370 struct dfl_feature *feature)
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;
381 fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
382 FME_FEATURE_ID_HEADER);
384 mutex_lock(&pdata->lock);
385 priv = dfl_fpga_pdata_get_private(pdata);
387 /* Initialize the region and bridge sub device list */
388 INIT_LIST_HEAD(&priv->region_list);
389 INIT_LIST_HEAD(&priv->bridge_list);
391 /* Create fpga mgr platform device */
392 mgr = dfl_fme_create_mgr(pdata, feature);
394 dev_err(&pdev->dev, "fail to create fpga mgr pdev\n");
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))
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);
414 list_add(&fme_br->node, &priv->bridge_list);
416 /* Create region for each port */
417 fme_region = dfl_fme_create_region(pdata, mgr,
419 if (IS_ERR(fme_region)) {
420 ret = PTR_ERR(fme_region);
424 list_add(&fme_region->node, &priv->region_list);
426 mutex_unlock(&pdata->lock);
431 dfl_fme_destroy_regions(pdata);
432 dfl_fme_destroy_bridges(pdata);
433 dfl_fme_destroy_mgr(pdata);
435 mutex_unlock(&pdata->lock);
439 static void pr_mgmt_uinit(struct platform_device *pdev,
440 struct dfl_feature *feature)
442 struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
444 mutex_lock(&pdata->lock);
446 dfl_fme_destroy_regions(pdata);
447 dfl_fme_destroy_bridges(pdata);
448 dfl_fme_destroy_mgr(pdata);
449 mutex_unlock(&pdata->lock);
452 static long fme_pr_ioctl(struct platform_device *pdev,
453 struct dfl_feature *feature,
454 unsigned int cmd, unsigned long arg)
459 case DFL_FPGA_FME_PORT_PR:
460 ret = fme_pr(pdev, arg);
469 const struct dfl_feature_id fme_pr_mgmt_id_table[] = {
470 {.id = FME_FEATURE_ID_PR_MGMT,},
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,