drivers/fpga/dfl-fme-pr.c

   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         if (!access_ok((void __user *)(unsigned long)port_pr.buffer_address,
 101                        port_pr.buffer_size))
 102                 return -EFAULT;
 103
 104         /*
 105          * align PR buffer per PR bandwidth, as HW ignores the extra padding
 106          * data automatically.
 107          */
 108         length = ALIGN(port_pr.buffer_size, 4);
 109
 110         buf = vmalloc(length);
 111         if (!buf)
 112                 return -ENOMEM;
 113
 114         if (copy_from_user(buf,
 115                            (void __user *)(unsigned long)port_pr.buffer_address,
 116                            port_pr.buffer_size)) {
 117                 ret = -EFAULT;
 118                 goto free_exit;
 119         }
 120
 121         /* prepare fpga_image_info for PR */
 122         info = fpga_image_info_alloc(&pdev->dev);
 123         if (!info) {
 124                 ret = -ENOMEM;
 125                 goto free_exit;
 126         }
 127
 128         info->flags |= FPGA_MGR_PARTIAL_RECONFIG;
 129
 130         mutex_lock(&pdata->lock);
 131         fme = dfl_fpga_pdata_get_private(pdata);
 132         /* fme device has been unregistered. */
 133         if (!fme) {
 134                 ret = -EINVAL;
 135                 goto unlock_exit;
 136         }
 137
 138         region = dfl_fme_region_find(fme, port_pr.port_id);
 139         if (!region) {
 140                 ret = -EINVAL;
 141                 goto unlock_exit;
 142         }
 143
 144         fpga_image_info_free(region->info);
 145
 146         info->buf = buf;
 147         info->count = length;
 148         info->region_id = port_pr.port_id;
 149         region->info = info;
 150
 151         ret = fpga_region_program_fpga(region);
 152
 153         /*
 154          * it allows userspace to reset the PR region's logic by disabling and
 155          * reenabling the bridge to clear things out between accleration runs.
 156          * so no need to hold the bridges after partial reconfiguration.
 157          */
 158         if (region->get_bridges)
 159                 fpga_bridges_put(&region->bridge_list);
 160
 161         put_device(&region->dev);
 162 unlock_exit:
 163         mutex_unlock(&pdata->lock);
 164 free_exit:
 165         vfree(buf);
 166         return ret;
 167 }
 168
 169 /**
 170  * dfl_fme_create_mgr - create fpga mgr platform device as child device
 171  *
 172  * @pdata: fme platform_device's pdata
 173  *
 174  * Return: mgr platform device if successful, and error code otherwise.
 175  */
 176 static struct platform_device *
 177 dfl_fme_create_mgr(struct dfl_feature_platform_data *pdata,
 178                    struct dfl_feature *feature)
 179 {
 180         struct platform_device *mgr, *fme = pdata->dev;
 181         struct dfl_fme_mgr_pdata mgr_pdata;
 182         int ret = -ENOMEM;
 183
 184         if (!feature->ioaddr)
 185                 return ERR_PTR(-ENODEV);
 186
 187         mgr_pdata.ioaddr = feature->ioaddr;
 188
 189         /*
 190          * Each FME has only one fpga-mgr, so allocate platform device using
 191          * the same FME platform device id.
 192          */
 193         mgr = platform_device_alloc(DFL_FPGA_FME_MGR, fme->id);
 194         if (!mgr)
 195                 return ERR_PTR(ret);
 196
 197         mgr->dev.parent = &fme->dev;
 198
 199         ret = platform_device_add_data(mgr, &mgr_pdata, sizeof(mgr_pdata));
 200         if (ret)
 201                 goto create_mgr_err;
 202
 203         ret = platform_device_add(mgr);
 204         if (ret)
 205                 goto create_mgr_err;
 206
 207         return mgr;
 208
 209 create_mgr_err:
 210         platform_device_put(mgr);
 211         return ERR_PTR(ret);
 212 }
 213
 214 /**
 215  * dfl_fme_destroy_mgr - destroy fpga mgr platform device
 216  * @pdata: fme platform device's pdata
 217  */
 218 static void dfl_fme_destroy_mgr(struct dfl_feature_platform_data *pdata)
 219 {
 220         struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
 221
 222         platform_device_unregister(priv->mgr);
 223 }
 224
 225 /**
 226  * dfl_fme_create_bridge - create fme fpga bridge platform device as child
 227  *
 228  * @pdata: fme platform device's pdata
 229  * @port_id: port id for the bridge to be created.
 230  *
 231  * Return: bridge platform device if successful, and error code otherwise.
 232  */
 233 static struct dfl_fme_bridge *
 234 dfl_fme_create_bridge(struct dfl_feature_platform_data *pdata, int port_id)
 235 {
 236         struct device *dev = &pdata->dev->dev;
 237         struct dfl_fme_br_pdata br_pdata;
 238         struct dfl_fme_bridge *fme_br;
 239         int ret = -ENOMEM;
 240
 241         fme_br = devm_kzalloc(dev, sizeof(*fme_br), GFP_KERNEL);
 242         if (!fme_br)
 243                 return ERR_PTR(ret);
 244
 245         br_pdata.cdev = pdata->dfl_cdev;
 246         br_pdata.port_id = port_id;
 247
 248         fme_br->br = platform_device_alloc(DFL_FPGA_FME_BRIDGE,
 249                                            PLATFORM_DEVID_AUTO);
 250         if (!fme_br->br)
 251                 return ERR_PTR(ret);
 252
 253         fme_br->br->dev.parent = dev;
 254
 255         ret = platform_device_add_data(fme_br->br, &br_pdata, sizeof(br_pdata));
 256         if (ret)
 257                 goto create_br_err;
 258
 259         ret = platform_device_add(fme_br->br);
 260         if (ret)
 261                 goto create_br_err;
 262
 263         return fme_br;
 264
 265 create_br_err:
 266         platform_device_put(fme_br->br);
 267         return ERR_PTR(ret);
 268 }
 269
 270 /**
 271  * dfl_fme_destroy_bridge - destroy fpga bridge platform device
 272  * @fme_br: fme bridge to destroy
 273  */
 274 static void dfl_fme_destroy_bridge(struct dfl_fme_bridge *fme_br)
 275 {
 276         platform_device_unregister(fme_br->br);
 277 }
 278
 279 /**
 280  * dfl_fme_destroy_bridge - destroy all fpga bridge platform device
 281  * @pdata: fme platform device's pdata
 282  */
 283 static void dfl_fme_destroy_bridges(struct dfl_feature_platform_data *pdata)
 284 {
 285         struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
 286         struct dfl_fme_bridge *fbridge, *tmp;
 287
 288         list_for_each_entry_safe(fbridge, tmp, &priv->bridge_list, node) {
 289                 list_del(&fbridge->node);
 290                 dfl_fme_destroy_bridge(fbridge);
 291         }
 292 }
 293
 294 /**
 295  * dfl_fme_create_region - create fpga region platform device as child
 296  *
 297  * @pdata: fme platform device's pdata
 298  * @mgr: mgr platform device needed for region
 299  * @br: br platform device needed for region
 300  * @port_id: port id
 301  *
 302  * Return: fme region if successful, and error code otherwise.
 303  */
 304 static struct dfl_fme_region *
 305 dfl_fme_create_region(struct dfl_feature_platform_data *pdata,
 306                       struct platform_device *mgr,
 307                       struct platform_device *br, int port_id)
 308 {
 309         struct dfl_fme_region_pdata region_pdata;
 310         struct device *dev = &pdata->dev->dev;
 311         struct dfl_fme_region *fme_region;
 312         int ret = -ENOMEM;
 313
 314         fme_region = devm_kzalloc(dev, sizeof(*fme_region), GFP_KERNEL);
 315         if (!fme_region)
 316                 return ERR_PTR(ret);
 317
 318         region_pdata.mgr = mgr;
 319         region_pdata.br = br;
 320
 321         /*
 322          * Each FPGA device may have more than one port, so allocate platform
 323          * device using the same port platform device id.
 324          */
 325         fme_region->region = platform_device_alloc(DFL_FPGA_FME_REGION, br->id);
 326         if (!fme_region->region)
 327                 return ERR_PTR(ret);
 328
 329         fme_region->region->dev.parent = dev;
 330
 331         ret = platform_device_add_data(fme_region->region, &region_pdata,
 332                                        sizeof(region_pdata));
 333         if (ret)
 334                 goto create_region_err;
 335
 336         ret = platform_device_add(fme_region->region);
 337         if (ret)
 338                 goto create_region_err;
 339
 340         fme_region->port_id = port_id;
 341
 342         return fme_region;
 343
 344 create_region_err:
 345         platform_device_put(fme_region->region);
 346         return ERR_PTR(ret);
 347 }
 348
 349 /**
 350  * dfl_fme_destroy_region - destroy fme region
 351  * @fme_region: fme region to destroy
 352  */
 353 static void dfl_fme_destroy_region(struct dfl_fme_region *fme_region)
 354 {
 355         platform_device_unregister(fme_region->region);
 356 }
 357
 358 /**
 359  * dfl_fme_destroy_regions - destroy all fme regions
 360  * @pdata: fme platform device's pdata
 361  */
 362 static void dfl_fme_destroy_regions(struct dfl_feature_platform_data *pdata)
 363 {
 364         struct dfl_fme *priv = dfl_fpga_pdata_get_private(pdata);
 365         struct dfl_fme_region *fme_region, *tmp;
 366
 367         list_for_each_entry_safe(fme_region, tmp, &priv->region_list, node) {
 368                 list_del(&fme_region->node);
 369                 dfl_fme_destroy_region(fme_region);
 370         }
 371 }
 372
 373 static int pr_mgmt_init(struct platform_device *pdev,
 374                         struct dfl_feature *feature)
 375 {
 376         struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
 377         struct dfl_fme_region *fme_region;
 378         struct dfl_fme_bridge *fme_br;
 379         struct platform_device *mgr;
 380         struct dfl_fme *priv;
 381         void __iomem *fme_hdr;
 382         int ret = -ENODEV, i = 0;
 383         u64 fme_cap, port_offset;
 384
 385         fme_hdr = dfl_get_feature_ioaddr_by_id(&pdev->dev,
 386                                                FME_FEATURE_ID_HEADER);
 387
 388         mutex_lock(&pdata->lock);
 389         priv = dfl_fpga_pdata_get_private(pdata);
 390
 391         /* Initialize the region and bridge sub device list */
 392         INIT_LIST_HEAD(&priv->region_list);
 393         INIT_LIST_HEAD(&priv->bridge_list);
 394
 395         /* Create fpga mgr platform device */
 396         mgr = dfl_fme_create_mgr(pdata, feature);
 397         if (IS_ERR(mgr)) {
 398                 dev_err(&pdev->dev, "fail to create fpga mgr pdev\n");
 399                 goto unlock;
 400         }
 401
 402         priv->mgr = mgr;
 403
 404         /* Read capability register to check number of regions and bridges */
 405         fme_cap = readq(fme_hdr + FME_HDR_CAP);
 406         for (; i < FIELD_GET(FME_CAP_NUM_PORTS, fme_cap); i++) {
 407                 port_offset = readq(fme_hdr + FME_HDR_PORT_OFST(i));
 408                 if (!(port_offset & FME_PORT_OFST_IMP))
 409                         continue;
 410
 411                 /* Create bridge for each port */
 412                 fme_br = dfl_fme_create_bridge(pdata, i);
 413                 if (IS_ERR(fme_br)) {
 414                         ret = PTR_ERR(fme_br);
 415                         goto destroy_region;
 416                 }
 417
 418                 list_add(&fme_br->node, &priv->bridge_list);
 419
 420                 /* Create region for each port */
 421                 fme_region = dfl_fme_create_region(pdata, mgr,
 422                                                    fme_br->br, i);
 423                 if (IS_ERR(fme_region)) {
 424                         ret = PTR_ERR(fme_region);
 425                         goto destroy_region;
 426                 }
 427
 428                 list_add(&fme_region->node, &priv->region_list);
 429         }
 430         mutex_unlock(&pdata->lock);
 431
 432         return 0;
 433
 434 destroy_region:
 435         dfl_fme_destroy_regions(pdata);
 436         dfl_fme_destroy_bridges(pdata);
 437         dfl_fme_destroy_mgr(pdata);
 438 unlock:
 439         mutex_unlock(&pdata->lock);
 440         return ret;
 441 }
 442
 443 static void pr_mgmt_uinit(struct platform_device *pdev,
 444                           struct dfl_feature *feature)
 445 {
 446         struct dfl_feature_platform_data *pdata = dev_get_platdata(&pdev->dev);
 447
 448         mutex_lock(&pdata->lock);
 449
 450         dfl_fme_destroy_regions(pdata);
 451         dfl_fme_destroy_bridges(pdata);
 452         dfl_fme_destroy_mgr(pdata);
 453         mutex_unlock(&pdata->lock);
 454 }
 455
 456 static long fme_pr_ioctl(struct platform_device *pdev,
 457                          struct dfl_feature *feature,
 458                          unsigned int cmd, unsigned long arg)
 459 {
 460         long ret;
 461
 462         switch (cmd) {
 463         case DFL_FPGA_FME_PORT_PR:
 464                 ret = fme_pr(pdev, arg);
 465                 break;
 466         default:
 467                 ret = -ENODEV;
 468         }
 469
 470         return ret;
 471 }
 472
 473 const struct dfl_feature_id fme_pr_mgmt_id_table[] = {
 474         {.id = FME_FEATURE_ID_PR_MGMT,},
 475         {0}
 476 };
 477
 478 const struct dfl_feature_ops fme_pr_mgmt_ops = {
 479         .init = pr_mgmt_init,
 480         .uinit = pr_mgmt_uinit,
 481         .ioctl = fme_pr_ioctl,
 482 };