drivers/vdpa/pds/vdpa_dev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Copyright(c) 2023 Advanced Micro Devices, Inc */
   3
   4 #include <linux/pci.h>
   5 #include <linux/vdpa.h>
   6 #include <uapi/linux/vdpa.h>
   7 #include <linux/virtio_pci_modern.h>
   8
   9 #include <linux/pds/pds_common.h>
  10 #include <linux/pds/pds_core_if.h>
  11 #include <linux/pds/pds_adminq.h>
  12 #include <linux/pds/pds_auxbus.h>
  13
  14 #include "vdpa_dev.h"
  15 #include "aux_drv.h"
  16 #include "cmds.h"
  17 #include "debugfs.h"
  18
  19 static u64 pds_vdpa_get_driver_features(struct vdpa_device *vdpa_dev);
  20
  21 static struct pds_vdpa_device *vdpa_to_pdsv(struct vdpa_device *vdpa_dev)
  22 {
  23         return container_of(vdpa_dev, struct pds_vdpa_device, vdpa_dev);
  24 }
  25
  26 static int pds_vdpa_notify_handler(struct notifier_block *nb,
  27                                    unsigned long ecode,
  28                                    void *data)
  29 {
  30         struct pds_vdpa_device *pdsv = container_of(nb, struct pds_vdpa_device, nb);
  31         struct device *dev = &pdsv->vdpa_aux->padev->aux_dev.dev;
  32
  33         dev_dbg(dev, "%s: event code %lu\n", __func__, ecode);
  34
  35         if (ecode == PDS_EVENT_RESET || ecode == PDS_EVENT_LINK_CHANGE) {
  36                 if (pdsv->config_cb.callback)
  37                         pdsv->config_cb.callback(pdsv->config_cb.private);
  38         }
  39
  40         return 0;
  41 }
  42
  43 static int pds_vdpa_register_event_handler(struct pds_vdpa_device *pdsv)
  44 {
  45         struct device *dev = &pdsv->vdpa_aux->padev->aux_dev.dev;
  46         struct notifier_block *nb = &pdsv->nb;
  47         int err;
  48
  49         if (!nb->notifier_call) {
  50                 nb->notifier_call = pds_vdpa_notify_handler;
  51                 err = pdsc_register_notify(nb);
  52                 if (err) {
  53                         nb->notifier_call = NULL;
  54                         dev_err(dev, "failed to register pds event handler: %ps\n",
  55                                 ERR_PTR(err));
  56                         return -EINVAL;
  57                 }
  58                 dev_dbg(dev, "pds event handler registered\n");
  59         }
  60
  61         return 0;
  62 }
  63
  64 static void pds_vdpa_unregister_event_handler(struct pds_vdpa_device *pdsv)
  65 {
  66         if (pdsv->nb.notifier_call) {
  67                 pdsc_unregister_notify(&pdsv->nb);
  68                 pdsv->nb.notifier_call = NULL;
  69         }
  70 }
  71
  72 static int pds_vdpa_set_vq_address(struct vdpa_device *vdpa_dev, u16 qid,
  73                                    u64 desc_addr, u64 driver_addr, u64 device_addr)
  74 {
  75         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
  76
  77         pdsv->vqs[qid].desc_addr = desc_addr;
  78         pdsv->vqs[qid].avail_addr = driver_addr;
  79         pdsv->vqs[qid].used_addr = device_addr;
  80
  81         return 0;
  82 }
  83
  84 static void pds_vdpa_set_vq_num(struct vdpa_device *vdpa_dev, u16 qid, u32 num)
  85 {
  86         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
  87
  88         pdsv->vqs[qid].q_len = num;
  89 }
  90
  91 static void pds_vdpa_kick_vq(struct vdpa_device *vdpa_dev, u16 qid)
  92 {
  93         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
  94
  95         iowrite16(qid, pdsv->vqs[qid].notify);
  96 }
  97
  98 static void pds_vdpa_set_vq_cb(struct vdpa_device *vdpa_dev, u16 qid,
  99                                struct vdpa_callback *cb)
 100 {
 101         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 102
 103         pdsv->vqs[qid].event_cb = *cb;
 104 }
 105
 106 static irqreturn_t pds_vdpa_isr(int irq, void *data)
 107 {
 108         struct pds_vdpa_vq_info *vq;
 109
 110         vq = data;
 111         if (vq->event_cb.callback)
 112                 vq->event_cb.callback(vq->event_cb.private);
 113
 114         return IRQ_HANDLED;
 115 }
 116
 117 static void pds_vdpa_release_irq(struct pds_vdpa_device *pdsv, int qid)
 118 {
 119         if (pdsv->vqs[qid].irq == VIRTIO_MSI_NO_VECTOR)
 120                 return;
 121
 122         free_irq(pdsv->vqs[qid].irq, &pdsv->vqs[qid]);
 123         pdsv->vqs[qid].irq = VIRTIO_MSI_NO_VECTOR;
 124 }
 125
 126 static void pds_vdpa_set_vq_ready(struct vdpa_device *vdpa_dev, u16 qid, bool ready)
 127 {
 128         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 129         struct device *dev = &pdsv->vdpa_dev.dev;
 130         u64 driver_features;
 131         u16 invert_idx = 0;
 132         int err;
 133
 134         dev_dbg(dev, "%s: qid %d ready %d => %d\n",
 135                 __func__, qid, pdsv->vqs[qid].ready, ready);
 136         if (ready == pdsv->vqs[qid].ready)
 137                 return;
 138
 139         driver_features = pds_vdpa_get_driver_features(vdpa_dev);
 140         if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED))
 141                 invert_idx = PDS_VDPA_PACKED_INVERT_IDX;
 142
 143         if (ready) {
 144                 /* Pass vq setup info to DSC using adminq to gather up and
 145                  * send all info at once so FW can do its full set up in
 146                  * one easy operation
 147                  */
 148                 err = pds_vdpa_cmd_init_vq(pdsv, qid, invert_idx, &pdsv->vqs[qid]);
 149                 if (err) {
 150                         dev_err(dev, "Failed to init vq %d: %pe\n",
 151                                 qid, ERR_PTR(err));
 152                         ready = false;
 153                 }
 154         } else {
 155                 err = pds_vdpa_cmd_reset_vq(pdsv, qid, invert_idx, &pdsv->vqs[qid]);
 156                 if (err)
 157                         dev_err(dev, "%s: reset_vq failed qid %d: %pe\n",
 158                                 __func__, qid, ERR_PTR(err));
 159         }
 160
 161         pdsv->vqs[qid].ready = ready;
 162 }
 163
 164 static bool pds_vdpa_get_vq_ready(struct vdpa_device *vdpa_dev, u16 qid)
 165 {
 166         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 167
 168         return pdsv->vqs[qid].ready;
 169 }
 170
 171 static int pds_vdpa_set_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
 172                                  const struct vdpa_vq_state *state)
 173 {
 174         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 175         struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
 176         struct device *dev = &padev->aux_dev.dev;
 177         u64 driver_features;
 178         u16 avail;
 179         u16 used;
 180
 181         if (pdsv->vqs[qid].ready) {
 182                 dev_err(dev, "Setting device position is denied while vq is enabled\n");
 183                 return -EINVAL;
 184         }
 185
 186         driver_features = pds_vdpa_get_driver_features(vdpa_dev);
 187         if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
 188                 avail = state->packed.last_avail_idx |
 189                         (state->packed.last_avail_counter << 15);
 190                 used = state->packed.last_used_idx |
 191                        (state->packed.last_used_counter << 15);
 192
 193                 /* The avail and used index are stored with the packed wrap
 194                  * counter bit inverted.  This way, in case set_vq_state is
 195                  * not called, the initial value can be set to zero prior to
 196                  * feature negotiation, and it is good for both packed and
 197                  * split vq.
 198                  */
 199                 avail ^= PDS_VDPA_PACKED_INVERT_IDX;
 200                 used ^= PDS_VDPA_PACKED_INVERT_IDX;
 201         } else {
 202                 avail = state->split.avail_index;
 203                 /* state->split does not provide a used_index:
 204                  * the vq will be set to "empty" here, and the vq will read
 205                  * the current used index the next time the vq is kicked.
 206                  */
 207                 used = avail;
 208         }
 209
 210         if (used != avail) {
 211                 dev_dbg(dev, "Setting used equal to avail, for interoperability\n");
 212                 used = avail;
 213         }
 214
 215         pdsv->vqs[qid].avail_idx = avail;
 216         pdsv->vqs[qid].used_idx = used;
 217
 218         return 0;
 219 }
 220
 221 static int pds_vdpa_get_vq_state(struct vdpa_device *vdpa_dev, u16 qid,
 222                                  struct vdpa_vq_state *state)
 223 {
 224         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 225         struct pds_auxiliary_dev *padev = pdsv->vdpa_aux->padev;
 226         struct device *dev = &padev->aux_dev.dev;
 227         u64 driver_features;
 228         u16 avail;
 229         u16 used;
 230
 231         if (pdsv->vqs[qid].ready) {
 232                 dev_err(dev, "Getting device position is denied while vq is enabled\n");
 233                 return -EINVAL;
 234         }
 235
 236         avail = pdsv->vqs[qid].avail_idx;
 237         used = pdsv->vqs[qid].used_idx;
 238
 239         driver_features = pds_vdpa_get_driver_features(vdpa_dev);
 240         if (driver_features & BIT_ULL(VIRTIO_F_RING_PACKED)) {
 241                 avail ^= PDS_VDPA_PACKED_INVERT_IDX;
 242                 used ^= PDS_VDPA_PACKED_INVERT_IDX;
 243
 244                 state->packed.last_avail_idx = avail & 0x7fff;
 245                 state->packed.last_avail_counter = avail >> 15;
 246                 state->packed.last_used_idx = used & 0x7fff;
 247                 state->packed.last_used_counter = used >> 15;
 248         } else {
 249                 state->split.avail_index = avail;
 250                 /* state->split does not provide a used_index. */
 251         }
 252
 253         return 0;
 254 }
 255
 256 static struct vdpa_notification_area
 257 pds_vdpa_get_vq_notification(struct vdpa_device *vdpa_dev, u16 qid)
 258 {
 259         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 260         struct virtio_pci_modern_device *vd_mdev;
 261         struct vdpa_notification_area area;
 262
 263         area.addr = pdsv->vqs[qid].notify_pa;
 264
 265         vd_mdev = &pdsv->vdpa_aux->vd_mdev;
 266         if (!vd_mdev->notify_offset_multiplier)
 267                 area.size = PDS_PAGE_SIZE;
 268         else
 269                 area.size = vd_mdev->notify_offset_multiplier;
 270
 271         return area;
 272 }
 273
 274 static int pds_vdpa_get_vq_irq(struct vdpa_device *vdpa_dev, u16 qid)
 275 {
 276         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 277
 278         return pdsv->vqs[qid].irq;
 279 }
 280
 281 static u32 pds_vdpa_get_vq_align(struct vdpa_device *vdpa_dev)
 282 {
 283         return PDS_PAGE_SIZE;
 284 }
 285
 286 static u32 pds_vdpa_get_vq_group(struct vdpa_device *vdpa_dev, u16 idx)
 287 {
 288         return 0;
 289 }
 290
 291 static u64 pds_vdpa_get_device_features(struct vdpa_device *vdpa_dev)
 292 {
 293         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 294
 295         return pdsv->supported_features;
 296 }
 297
 298 static int pds_vdpa_set_driver_features(struct vdpa_device *vdpa_dev, u64 features)
 299 {
 300         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 301         struct device *dev = &pdsv->vdpa_dev.dev;
 302         u64 driver_features;
 303         u64 nego_features;
 304         u64 hw_features;
 305         u64 missing;
 306
 307         if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
 308                 dev_err(dev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
 309                 return -EOPNOTSUPP;
 310         }
 311
 312         /* Check for valid feature bits */
 313         nego_features = features & pdsv->supported_features;
 314         missing = features & ~nego_features;
 315         if (missing) {
 316                 dev_err(dev, "Can't support all requested features in %#llx, missing %#llx features\n",
 317                         features, missing);
 318                 return -EOPNOTSUPP;
 319         }
 320
 321         driver_features = pds_vdpa_get_driver_features(vdpa_dev);
 322         pdsv->negotiated_features = nego_features;
 323         dev_dbg(dev, "%s: %#llx => %#llx\n",
 324                 __func__, driver_features, nego_features);
 325
 326         /* if we're faking the F_MAC, strip it before writing to device */
 327         hw_features = le64_to_cpu(pdsv->vdpa_aux->ident.hw_features);
 328         if (!(hw_features & BIT_ULL(VIRTIO_NET_F_MAC)))
 329                 nego_features &= ~BIT_ULL(VIRTIO_NET_F_MAC);
 330
 331         if (driver_features == nego_features)
 332                 return 0;
 333
 334         vp_modern_set_features(&pdsv->vdpa_aux->vd_mdev, nego_features);
 335
 336         return 0;
 337 }
 338
 339 static u64 pds_vdpa_get_driver_features(struct vdpa_device *vdpa_dev)
 340 {
 341         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 342
 343         return pdsv->negotiated_features;
 344 }
 345
 346 static void pds_vdpa_set_config_cb(struct vdpa_device *vdpa_dev,
 347                                    struct vdpa_callback *cb)
 348 {
 349         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 350
 351         pdsv->config_cb.callback = cb->callback;
 352         pdsv->config_cb.private = cb->private;
 353 }
 354
 355 static u16 pds_vdpa_get_vq_num_max(struct vdpa_device *vdpa_dev)
 356 {
 357         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 358
 359         /* qemu has assert() that vq_num_max <= VIRTQUEUE_MAX_SIZE (1024) */
 360         return min_t(u16, 1024, BIT(le16_to_cpu(pdsv->vdpa_aux->ident.max_qlen)));
 361 }
 362
 363 static u32 pds_vdpa_get_device_id(struct vdpa_device *vdpa_dev)
 364 {
 365         return VIRTIO_ID_NET;
 366 }
 367
 368 static u32 pds_vdpa_get_vendor_id(struct vdpa_device *vdpa_dev)
 369 {
 370         return PCI_VENDOR_ID_PENSANDO;
 371 }
 372
 373 static u8 pds_vdpa_get_status(struct vdpa_device *vdpa_dev)
 374 {
 375         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 376
 377         return vp_modern_get_status(&pdsv->vdpa_aux->vd_mdev);
 378 }
 379
 380 static int pds_vdpa_request_irqs(struct pds_vdpa_device *pdsv)
 381 {
 382         struct pci_dev *pdev = pdsv->vdpa_aux->padev->vf_pdev;
 383         struct pds_vdpa_aux *vdpa_aux = pdsv->vdpa_aux;
 384         struct device *dev = &pdsv->vdpa_dev.dev;
 385         int max_vq, nintrs, qid, err;
 386
 387         max_vq = vdpa_aux->vdpa_mdev.max_supported_vqs;
 388
 389         nintrs = pci_alloc_irq_vectors(pdev, max_vq, max_vq, PCI_IRQ_MSIX);
 390         if (nintrs < 0) {
 391                 dev_err(dev, "Couldn't get %d msix vectors: %pe\n",
 392                         max_vq, ERR_PTR(nintrs));
 393                 return nintrs;
 394         }
 395
 396         for (qid = 0; qid < pdsv->num_vqs; ++qid) {
 397                 int irq = pci_irq_vector(pdev, qid);
 398
 399                 snprintf(pdsv->vqs[qid].irq_name, sizeof(pdsv->vqs[qid].irq_name),
 400                          "vdpa-%s-%d", dev_name(dev), qid);
 401
 402                 err = request_irq(irq, pds_vdpa_isr, 0,
 403                                   pdsv->vqs[qid].irq_name,
 404                                   &pdsv->vqs[qid]);
 405                 if (err) {
 406                         dev_err(dev, "%s: no irq for qid %d: %pe\n",
 407                                 __func__, qid, ERR_PTR(err));
 408                         goto err_release;
 409                 }
 410
 411                 pdsv->vqs[qid].irq = irq;
 412         }
 413
 414         vdpa_aux->nintrs = nintrs;
 415
 416         return 0;
 417
 418 err_release:
 419         while (qid--)
 420                 pds_vdpa_release_irq(pdsv, qid);
 421
 422         pci_free_irq_vectors(pdev);
 423
 424         vdpa_aux->nintrs = 0;
 425
 426         return err;
 427 }
 428
 429 static void pds_vdpa_release_irqs(struct pds_vdpa_device *pdsv)
 430 {
 431         struct pci_dev *pdev = pdsv->vdpa_aux->padev->vf_pdev;
 432         struct pds_vdpa_aux *vdpa_aux = pdsv->vdpa_aux;
 433         int qid;
 434
 435         if (!vdpa_aux->nintrs)
 436                 return;
 437
 438         for (qid = 0; qid < pdsv->num_vqs; qid++)
 439                 pds_vdpa_release_irq(pdsv, qid);
 440
 441         pci_free_irq_vectors(pdev);
 442
 443         vdpa_aux->nintrs = 0;
 444 }
 445
 446 static void pds_vdpa_set_status(struct vdpa_device *vdpa_dev, u8 status)
 447 {
 448         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 449         struct device *dev = &pdsv->vdpa_dev.dev;
 450         u8 old_status;
 451         int i;
 452
 453         old_status = pds_vdpa_get_status(vdpa_dev);
 454         dev_dbg(dev, "%s: old %#x new %#x\n", __func__, old_status, status);
 455
 456         if (status & ~old_status & VIRTIO_CONFIG_S_DRIVER_OK) {
 457                 if (pds_vdpa_request_irqs(pdsv))
 458                         status = old_status | VIRTIO_CONFIG_S_FAILED;
 459         }
 460
 461         pds_vdpa_cmd_set_status(pdsv, status);
 462
 463         if (status == 0) {
 464                 struct vdpa_callback null_cb = { };
 465
 466                 pds_vdpa_set_config_cb(vdpa_dev, &null_cb);
 467                 pds_vdpa_cmd_reset(pdsv);
 468
 469                 for (i = 0; i < pdsv->num_vqs; i++) {
 470                         pdsv->vqs[i].avail_idx = 0;
 471                         pdsv->vqs[i].used_idx = 0;
 472                 }
 473
 474                 pds_vdpa_cmd_set_mac(pdsv, pdsv->mac);
 475         }
 476
 477         if (status & ~old_status & VIRTIO_CONFIG_S_FEATURES_OK) {
 478                 for (i = 0; i < pdsv->num_vqs; i++) {
 479                         pdsv->vqs[i].notify =
 480                                 vp_modern_map_vq_notify(&pdsv->vdpa_aux->vd_mdev,
 481                                                         i, &pdsv->vqs[i].notify_pa);
 482                 }
 483         }
 484
 485         if (old_status & ~status & VIRTIO_CONFIG_S_DRIVER_OK)
 486                 pds_vdpa_release_irqs(pdsv);
 487 }
 488
 489 static void pds_vdpa_init_vqs_entry(struct pds_vdpa_device *pdsv, int qid,
 490                                     void __iomem *notify)
 491 {
 492         memset(&pdsv->vqs[qid], 0, sizeof(pdsv->vqs[0]));
 493         pdsv->vqs[qid].qid = qid;
 494         pdsv->vqs[qid].pdsv = pdsv;
 495         pdsv->vqs[qid].ready = false;
 496         pdsv->vqs[qid].irq = VIRTIO_MSI_NO_VECTOR;
 497         pdsv->vqs[qid].notify = notify;
 498 }
 499
 500 static int pds_vdpa_reset(struct vdpa_device *vdpa_dev)
 501 {
 502         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 503         struct device *dev;
 504         int err = 0;
 505         u8 status;
 506         int i;
 507
 508         dev = &pdsv->vdpa_aux->padev->aux_dev.dev;
 509         status = pds_vdpa_get_status(vdpa_dev);
 510
 511         if (status == 0)
 512                 return 0;
 513
 514         if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
 515                 /* Reset the vqs */
 516                 for (i = 0; i < pdsv->num_vqs && !err; i++) {
 517                         err = pds_vdpa_cmd_reset_vq(pdsv, i, 0, &pdsv->vqs[i]);
 518                         if (err)
 519                                 dev_err(dev, "%s: reset_vq failed qid %d: %pe\n",
 520                                         __func__, i, ERR_PTR(err));
 521                 }
 522         }
 523
 524         pds_vdpa_set_status(vdpa_dev, 0);
 525
 526         if (status & VIRTIO_CONFIG_S_DRIVER_OK) {
 527                 /* Reset the vq info */
 528                 for (i = 0; i < pdsv->num_vqs && !err; i++)
 529                         pds_vdpa_init_vqs_entry(pdsv, i, pdsv->vqs[i].notify);
 530         }
 531
 532         return 0;
 533 }
 534
 535 static size_t pds_vdpa_get_config_size(struct vdpa_device *vdpa_dev)
 536 {
 537         return sizeof(struct virtio_net_config);
 538 }
 539
 540 static void pds_vdpa_get_config(struct vdpa_device *vdpa_dev,
 541                                 unsigned int offset,
 542                                 void *buf, unsigned int len)
 543 {
 544         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 545         void __iomem *device;
 546
 547         if (offset + len > sizeof(struct virtio_net_config)) {
 548                 WARN(true, "%s: bad read, offset %d len %d\n", __func__, offset, len);
 549                 return;
 550         }
 551
 552         device = pdsv->vdpa_aux->vd_mdev.device;
 553         memcpy_fromio(buf, device + offset, len);
 554 }
 555
 556 static void pds_vdpa_set_config(struct vdpa_device *vdpa_dev,
 557                                 unsigned int offset, const void *buf,
 558                                 unsigned int len)
 559 {
 560         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 561         void __iomem *device;
 562
 563         if (offset + len > sizeof(struct virtio_net_config)) {
 564                 WARN(true, "%s: bad read, offset %d len %d\n", __func__, offset, len);
 565                 return;
 566         }
 567
 568         device = pdsv->vdpa_aux->vd_mdev.device;
 569         memcpy_toio(device + offset, buf, len);
 570 }
 571
 572 static const struct vdpa_config_ops pds_vdpa_ops = {
 573         .set_vq_address         = pds_vdpa_set_vq_address,
 574         .set_vq_num             = pds_vdpa_set_vq_num,
 575         .kick_vq                = pds_vdpa_kick_vq,
 576         .set_vq_cb              = pds_vdpa_set_vq_cb,
 577         .set_vq_ready           = pds_vdpa_set_vq_ready,
 578         .get_vq_ready           = pds_vdpa_get_vq_ready,
 579         .set_vq_state           = pds_vdpa_set_vq_state,
 580         .get_vq_state           = pds_vdpa_get_vq_state,
 581         .get_vq_notification    = pds_vdpa_get_vq_notification,
 582         .get_vq_irq             = pds_vdpa_get_vq_irq,
 583         .get_vq_align           = pds_vdpa_get_vq_align,
 584         .get_vq_group           = pds_vdpa_get_vq_group,
 585
 586         .get_device_features    = pds_vdpa_get_device_features,
 587         .set_driver_features    = pds_vdpa_set_driver_features,
 588         .get_driver_features    = pds_vdpa_get_driver_features,
 589         .set_config_cb          = pds_vdpa_set_config_cb,
 590         .get_vq_num_max         = pds_vdpa_get_vq_num_max,
 591         .get_device_id          = pds_vdpa_get_device_id,
 592         .get_vendor_id          = pds_vdpa_get_vendor_id,
 593         .get_status             = pds_vdpa_get_status,
 594         .set_status             = pds_vdpa_set_status,
 595         .reset                  = pds_vdpa_reset,
 596         .get_config_size        = pds_vdpa_get_config_size,
 597         .get_config             = pds_vdpa_get_config,
 598         .set_config             = pds_vdpa_set_config,
 599 };
 600 static struct virtio_device_id pds_vdpa_id_table[] = {
 601         {VIRTIO_ID_NET, VIRTIO_DEV_ANY_ID},
 602         {0},
 603 };
 604
 605 static int pds_vdpa_dev_add(struct vdpa_mgmt_dev *mdev, const char *name,
 606                             const struct vdpa_dev_set_config *add_config)
 607 {
 608         struct pds_vdpa_aux *vdpa_aux;
 609         struct pds_vdpa_device *pdsv;
 610         struct vdpa_mgmt_dev *mgmt;
 611         u16 fw_max_vqs, vq_pairs;
 612         struct device *dma_dev;
 613         struct pci_dev *pdev;
 614         struct device *dev;
 615         int err;
 616         int i;
 617
 618         vdpa_aux = container_of(mdev, struct pds_vdpa_aux, vdpa_mdev);
 619         dev = &vdpa_aux->padev->aux_dev.dev;
 620         mgmt = &vdpa_aux->vdpa_mdev;
 621
 622         if (vdpa_aux->pdsv) {
 623                 dev_warn(dev, "Multiple vDPA devices on a VF is not supported.\n");
 624                 return -EOPNOTSUPP;
 625         }
 626
 627         pdsv = vdpa_alloc_device(struct pds_vdpa_device, vdpa_dev,
 628                                  dev, &pds_vdpa_ops, 1, 1, name, false);
 629         if (IS_ERR(pdsv)) {
 630                 dev_err(dev, "Failed to allocate vDPA structure: %pe\n", pdsv);
 631                 return PTR_ERR(pdsv);
 632         }
 633
 634         vdpa_aux->pdsv = pdsv;
 635         pdsv->vdpa_aux = vdpa_aux;
 636
 637         pdev = vdpa_aux->padev->vf_pdev;
 638         dma_dev = &pdev->dev;
 639         pdsv->vdpa_dev.dma_dev = dma_dev;
 640
 641         pdsv->supported_features = mgmt->supported_features;
 642
 643         if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_FEATURES)) {
 644                 u64 unsupp_features =
 645                         add_config->device_features & ~pdsv->supported_features;
 646
 647                 if (unsupp_features) {
 648                         dev_err(dev, "Unsupported features: %#llx\n", unsupp_features);
 649                         err = -EOPNOTSUPP;
 650                         goto err_unmap;
 651                 }
 652
 653                 pdsv->supported_features = add_config->device_features;
 654         }
 655
 656         err = pds_vdpa_cmd_reset(pdsv);
 657         if (err) {
 658                 dev_err(dev, "Failed to reset hw: %pe\n", ERR_PTR(err));
 659                 goto err_unmap;
 660         }
 661
 662         err = pds_vdpa_init_hw(pdsv);
 663         if (err) {
 664                 dev_err(dev, "Failed to init hw: %pe\n", ERR_PTR(err));
 665                 goto err_unmap;
 666         }
 667
 668         fw_max_vqs = le16_to_cpu(pdsv->vdpa_aux->ident.max_vqs);
 669         vq_pairs = fw_max_vqs / 2;
 670
 671         /* Make sure we have the queues being requested */
 672         if (add_config->mask & (1 << VDPA_ATTR_DEV_NET_CFG_MAX_VQP))
 673                 vq_pairs = add_config->net.max_vq_pairs;
 674
 675         pdsv->num_vqs = 2 * vq_pairs;
 676         if (pdsv->supported_features & BIT_ULL(VIRTIO_NET_F_CTRL_VQ))
 677                 pdsv->num_vqs++;
 678
 679         if (pdsv->num_vqs > fw_max_vqs) {
 680                 dev_err(dev, "%s: queue count requested %u greater than max %u\n",
 681                         __func__, pdsv->num_vqs, fw_max_vqs);
 682                 err = -ENOSPC;
 683                 goto err_unmap;
 684         }
 685
 686         if (pdsv->num_vqs != fw_max_vqs) {
 687                 err = pds_vdpa_cmd_set_max_vq_pairs(pdsv, vq_pairs);
 688                 if (err) {
 689                         dev_err(dev, "Failed to set max_vq_pairs: %pe\n",
 690                                 ERR_PTR(err));
 691                         goto err_unmap;
 692                 }
 693         }
 694
 695         /* Set a mac, either from the user config if provided
 696          * or use the device's mac if not 00:..:00
 697          * or set a random mac
 698          */
 699         if (add_config->mask & BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR)) {
 700                 ether_addr_copy(pdsv->mac, add_config->net.mac);
 701         } else {
 702                 struct virtio_net_config __iomem *vc;
 703
 704                 vc = pdsv->vdpa_aux->vd_mdev.device;
 705                 memcpy_fromio(pdsv->mac, vc->mac, sizeof(pdsv->mac));
 706                 if (is_zero_ether_addr(pdsv->mac) &&
 707                     (pdsv->supported_features & BIT_ULL(VIRTIO_NET_F_MAC))) {
 708                         eth_random_addr(pdsv->mac);
 709                         dev_info(dev, "setting random mac %pM\n", pdsv->mac);
 710                 }
 711         }
 712         pds_vdpa_cmd_set_mac(pdsv, pdsv->mac);
 713
 714         for (i = 0; i < pdsv->num_vqs; i++) {
 715                 void __iomem *notify;
 716
 717                 notify = vp_modern_map_vq_notify(&pdsv->vdpa_aux->vd_mdev,
 718                                                  i, &pdsv->vqs[i].notify_pa);
 719                 pds_vdpa_init_vqs_entry(pdsv, i, notify);
 720         }
 721
 722         pdsv->vdpa_dev.mdev = &vdpa_aux->vdpa_mdev;
 723
 724         err = pds_vdpa_register_event_handler(pdsv);
 725         if (err) {
 726                 dev_err(dev, "Failed to register for PDS events: %pe\n", ERR_PTR(err));
 727                 goto err_unmap;
 728         }
 729
 730         /* We use the _vdpa_register_device() call rather than the
 731          * vdpa_register_device() to avoid a deadlock because our
 732          * dev_add() is called with the vdpa_dev_lock already set
 733          * by vdpa_nl_cmd_dev_add_set_doit()
 734          */
 735         err = _vdpa_register_device(&pdsv->vdpa_dev, pdsv->num_vqs);
 736         if (err) {
 737                 dev_err(dev, "Failed to register to vDPA bus: %pe\n", ERR_PTR(err));
 738                 goto err_unevent;
 739         }
 740
 741         pds_vdpa_debugfs_add_vdpadev(vdpa_aux);
 742
 743         return 0;
 744
 745 err_unevent:
 746         pds_vdpa_unregister_event_handler(pdsv);
 747 err_unmap:
 748         put_device(&pdsv->vdpa_dev.dev);
 749         vdpa_aux->pdsv = NULL;
 750         return err;
 751 }
 752
 753 static void pds_vdpa_dev_del(struct vdpa_mgmt_dev *mdev,
 754                              struct vdpa_device *vdpa_dev)
 755 {
 756         struct pds_vdpa_device *pdsv = vdpa_to_pdsv(vdpa_dev);
 757         struct pds_vdpa_aux *vdpa_aux;
 758
 759         pds_vdpa_unregister_event_handler(pdsv);
 760
 761         vdpa_aux = container_of(mdev, struct pds_vdpa_aux, vdpa_mdev);
 762         _vdpa_unregister_device(vdpa_dev);
 763
 764         pds_vdpa_cmd_reset(vdpa_aux->pdsv);
 765         pds_vdpa_debugfs_reset_vdpadev(vdpa_aux);
 766
 767         vdpa_aux->pdsv = NULL;
 768
 769         dev_info(&vdpa_aux->padev->aux_dev.dev, "Removed vdpa device\n");
 770 }
 771
 772 static const struct vdpa_mgmtdev_ops pds_vdpa_mgmt_dev_ops = {
 773         .dev_add = pds_vdpa_dev_add,
 774         .dev_del = pds_vdpa_dev_del
 775 };
 776
 777 int pds_vdpa_get_mgmt_info(struct pds_vdpa_aux *vdpa_aux)
 778 {
 779         union pds_core_adminq_cmd cmd = {
 780                 .vdpa_ident.opcode = PDS_VDPA_CMD_IDENT,
 781                 .vdpa_ident.vf_id = cpu_to_le16(vdpa_aux->vf_id),
 782         };
 783         union pds_core_adminq_comp comp = {};
 784         struct vdpa_mgmt_dev *mgmt;
 785         struct pci_dev *pf_pdev;
 786         struct device *pf_dev;
 787         struct pci_dev *pdev;
 788         dma_addr_t ident_pa;
 789         struct device *dev;
 790         u16 dev_intrs;
 791         u16 max_vqs;
 792         int err;
 793
 794         dev = &vdpa_aux->padev->aux_dev.dev;
 795         pdev = vdpa_aux->padev->vf_pdev;
 796         mgmt = &vdpa_aux->vdpa_mdev;
 797
 798         /* Get resource info through the PF's adminq.  It is a block of info,
 799          * so we need to map some memory for PF to make available to the
 800          * firmware for writing the data.
 801          */
 802         pf_pdev = pci_physfn(vdpa_aux->padev->vf_pdev);
 803         pf_dev = &pf_pdev->dev;
 804         ident_pa = dma_map_single(pf_dev, &vdpa_aux->ident,
 805                                   sizeof(vdpa_aux->ident), DMA_FROM_DEVICE);
 806         if (dma_mapping_error(pf_dev, ident_pa)) {
 807                 dev_err(dev, "Failed to map ident space\n");
 808                 return -ENOMEM;
 809         }
 810
 811         cmd.vdpa_ident.ident_pa = cpu_to_le64(ident_pa);
 812         cmd.vdpa_ident.len = cpu_to_le32(sizeof(vdpa_aux->ident));
 813         err = pds_client_adminq_cmd(vdpa_aux->padev, &cmd,
 814                                     sizeof(cmd.vdpa_ident), &comp, 0);
 815         dma_unmap_single(pf_dev, ident_pa,
 816                          sizeof(vdpa_aux->ident), DMA_FROM_DEVICE);
 817         if (err) {
 818                 dev_err(dev, "Failed to ident hw, status %d: %pe\n",
 819                         comp.status, ERR_PTR(err));
 820                 return err;
 821         }
 822
 823         max_vqs = le16_to_cpu(vdpa_aux->ident.max_vqs);
 824         dev_intrs = pci_msix_vec_count(pdev);
 825         dev_dbg(dev, "ident.max_vqs %d dev_intrs %d\n", max_vqs, dev_intrs);
 826
 827         max_vqs = min_t(u16, dev_intrs, max_vqs);
 828         mgmt->max_supported_vqs = min_t(u16, PDS_VDPA_MAX_QUEUES, max_vqs);
 829         vdpa_aux->nintrs = 0;
 830
 831         mgmt->ops = &pds_vdpa_mgmt_dev_ops;
 832         mgmt->id_table = pds_vdpa_id_table;
 833         mgmt->device = dev;
 834         mgmt->supported_features = le64_to_cpu(vdpa_aux->ident.hw_features);
 835
 836         /* advertise F_MAC even if the device doesn't */
 837         mgmt->supported_features |= BIT_ULL(VIRTIO_NET_F_MAC);
 838
 839         mgmt->config_attr_mask = BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MACADDR);
 840         mgmt->config_attr_mask |= BIT_ULL(VDPA_ATTR_DEV_NET_CFG_MAX_VQP);
 841         mgmt->config_attr_mask |= BIT_ULL(VDPA_ATTR_DEV_FEATURES);
 842
 843         return 0;
 844 }