drivers/vdpa/ifcvf/ifcvf_base.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel IFC VF NIC driver for virtio dataplane offloading
   4  *
   5  * Copyright (C) 2020 Intel Corporation.
   6  *
   7  * Author: Zhu Lingshan <lingshan.zhu@intel.com>
   8  *
   9  */
  10
  11 #include "ifcvf_base.h"
  12
  13 u16 ifcvf_set_vq_vector(struct ifcvf_hw *hw, u16 qid, int vector)
  14 {
  15         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
  16
  17         vp_iowrite16(qid, &cfg->queue_select);
  18         vp_iowrite16(vector, &cfg->queue_msix_vector);
  19
  20         return vp_ioread16(&cfg->queue_msix_vector);
  21 }
  22
  23 u16 ifcvf_set_config_vector(struct ifcvf_hw *hw, int vector)
  24 {
  25         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
  26
  27         vp_iowrite16(vector,  &cfg->msix_config);
  28
  29         return vp_ioread16(&cfg->msix_config);
  30 }
  31
  32 static void __iomem *get_cap_addr(struct ifcvf_hw *hw,
  33                                   struct virtio_pci_cap *cap)
  34 {
  35         u32 length, offset;
  36         u8 bar;
  37
  38         length = le32_to_cpu(cap->length);
  39         offset = le32_to_cpu(cap->offset);
  40         bar = cap->bar;
  41
  42         if (bar >= IFCVF_PCI_MAX_RESOURCE) {
  43                 IFCVF_DBG(hw->pdev,
  44                           "Invalid bar number %u to get capabilities\n", bar);
  45                 return NULL;
  46         }
  47
  48         if (offset + length > pci_resource_len(hw->pdev, bar)) {
  49                 IFCVF_DBG(hw->pdev,
  50                           "offset(%u) + len(%u) overflows bar%u's capability\n",
  51                           offset, length, bar);
  52                 return NULL;
  53         }
  54
  55         return hw->base[bar] + offset;
  56 }
  57
  58 static int ifcvf_read_config_range(struct pci_dev *dev,
  59                                    uint32_t *val, int size, int where)
  60 {
  61         int ret, i;
  62
  63         for (i = 0; i < size; i += 4) {
  64                 ret = pci_read_config_dword(dev, where + i, val + i / 4);
  65                 if (ret < 0)
  66                         return ret;
  67         }
  68
  69         return 0;
  70 }
  71
  72 static u16 ifcvf_get_vq_size(struct ifcvf_hw *hw, u16 qid)
  73 {
  74         u16 queue_size;
  75
  76         vp_iowrite16(qid, &hw->common_cfg->queue_select);
  77         queue_size = vp_ioread16(&hw->common_cfg->queue_size);
  78
  79         return queue_size;
  80 }
  81
  82 /* This function returns the max allowed safe size for
  83  * all virtqueues. It is the minimal size that can be
  84  * suppprted by all virtqueues.
  85  */
  86 u16 ifcvf_get_max_vq_size(struct ifcvf_hw *hw)
  87 {
  88         u16 queue_size, max_size, qid;
  89
  90         max_size = ifcvf_get_vq_size(hw, 0);
  91         for (qid = 1; qid < hw->nr_vring; qid++) {
  92                 queue_size = ifcvf_get_vq_size(hw, qid);
  93                 /* 0 means the queue is unavailable */
  94                 if (!queue_size)
  95                         continue;
  96
  97                 max_size = min(queue_size, max_size);
  98         }
  99
 100         return max_size;
 101 }
 102
 103 int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
 104 {
 105         struct virtio_pci_cap cap;
 106         u16 notify_off;
 107         int ret;
 108         u8 pos;
 109         u32 i;
 110
 111         ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos);
 112         if (ret < 0) {
 113                 IFCVF_ERR(pdev, "Failed to read PCI capability list\n");
 114                 return -EIO;
 115         }
 116         hw->pdev = pdev;
 117
 118         while (pos) {
 119                 ret = ifcvf_read_config_range(pdev, (u32 *)&cap,
 120                                               sizeof(cap), pos);
 121                 if (ret < 0) {
 122                         IFCVF_ERR(pdev,
 123                                   "Failed to get PCI capability at %x\n", pos);
 124                         break;
 125                 }
 126
 127                 if (cap.cap_vndr != PCI_CAP_ID_VNDR)
 128                         goto next;
 129
 130                 switch (cap.cfg_type) {
 131                 case VIRTIO_PCI_CAP_COMMON_CFG:
 132                         hw->common_cfg = get_cap_addr(hw, &cap);
 133                         IFCVF_DBG(pdev, "hw->common_cfg = %p\n",
 134                                   hw->common_cfg);
 135                         break;
 136                 case VIRTIO_PCI_CAP_NOTIFY_CFG:
 137                         pci_read_config_dword(pdev, pos + sizeof(cap),
 138                                               &hw->notify_off_multiplier);
 139                         hw->notify_bar = cap.bar;
 140                         hw->notify_base = get_cap_addr(hw, &cap);
 141                         hw->notify_base_pa = pci_resource_start(pdev, cap.bar) +
 142                                         le32_to_cpu(cap.offset);
 143                         IFCVF_DBG(pdev, "hw->notify_base = %p\n",
 144                                   hw->notify_base);
 145                         break;
 146                 case VIRTIO_PCI_CAP_ISR_CFG:
 147                         hw->isr = get_cap_addr(hw, &cap);
 148                         IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr);
 149                         break;
 150                 case VIRTIO_PCI_CAP_DEVICE_CFG:
 151                         hw->dev_cfg = get_cap_addr(hw, &cap);
 152                         hw->cap_dev_config_size = le32_to_cpu(cap.length);
 153                         IFCVF_DBG(pdev, "hw->dev_cfg = %p\n", hw->dev_cfg);
 154                         break;
 155                 }
 156
 157 next:
 158                 pos = cap.cap_next;
 159         }
 160
 161         if (hw->common_cfg == NULL || hw->notify_base == NULL ||
 162             hw->isr == NULL || hw->dev_cfg == NULL) {
 163                 IFCVF_ERR(pdev, "Incomplete PCI capabilities\n");
 164                 return -EIO;
 165         }
 166
 167         hw->nr_vring = vp_ioread16(&hw->common_cfg->num_queues);
 168         hw->vring = kzalloc(sizeof(struct vring_info) * hw->nr_vring, GFP_KERNEL);
 169         if (!hw->vring)
 170                 return -ENOMEM;
 171
 172         for (i = 0; i < hw->nr_vring; i++) {
 173                 vp_iowrite16(i, &hw->common_cfg->queue_select);
 174                 notify_off = vp_ioread16(&hw->common_cfg->queue_notify_off);
 175                 hw->vring[i].notify_addr = hw->notify_base +
 176                         notify_off * hw->notify_off_multiplier;
 177                 hw->vring[i].notify_pa = hw->notify_base_pa +
 178                         notify_off * hw->notify_off_multiplier;
 179                 hw->vring[i].irq = -EINVAL;
 180         }
 181
 182         hw->lm_cfg = hw->base[IFCVF_LM_BAR];
 183
 184         IFCVF_DBG(pdev,
 185                   "PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n",
 186                   hw->common_cfg, hw->notify_base, hw->isr,
 187                   hw->dev_cfg, hw->notify_off_multiplier);
 188
 189         hw->vqs_reused_irq = -EINVAL;
 190         hw->config_irq = -EINVAL;
 191
 192         return 0;
 193 }
 194
 195 u8 ifcvf_get_status(struct ifcvf_hw *hw)
 196 {
 197         return vp_ioread8(&hw->common_cfg->device_status);
 198 }
 199
 200 void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
 201 {
 202         vp_iowrite8(status, &hw->common_cfg->device_status);
 203 }
 204
 205 void ifcvf_reset(struct ifcvf_hw *hw)
 206 {
 207         ifcvf_set_status(hw, 0);
 208         while (ifcvf_get_status(hw))
 209                 msleep(1);
 210 }
 211
 212 u64 ifcvf_get_hw_features(struct ifcvf_hw *hw)
 213 {
 214         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 215         u32 features_lo, features_hi;
 216         u64 features;
 217
 218         vp_iowrite32(0, &cfg->device_feature_select);
 219         features_lo = vp_ioread32(&cfg->device_feature);
 220
 221         vp_iowrite32(1, &cfg->device_feature_select);
 222         features_hi = vp_ioread32(&cfg->device_feature);
 223
 224         features = ((u64)features_hi << 32) | features_lo;
 225
 226         return features;
 227 }
 228
 229 /* return provisioned vDPA dev features */
 230 u64 ifcvf_get_dev_features(struct ifcvf_hw *hw)
 231 {
 232         return hw->dev_features;
 233 }
 234
 235 u64 ifcvf_get_driver_features(struct ifcvf_hw *hw)
 236 {
 237         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 238         u32 features_lo, features_hi;
 239         u64 features;
 240
 241         vp_iowrite32(0, &cfg->device_feature_select);
 242         features_lo = vp_ioread32(&cfg->guest_feature);
 243
 244         vp_iowrite32(1, &cfg->device_feature_select);
 245         features_hi = vp_ioread32(&cfg->guest_feature);
 246
 247         features = ((u64)features_hi << 32) | features_lo;
 248
 249         return features;
 250 }
 251
 252 int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features)
 253 {
 254         if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
 255                 IFCVF_ERR(hw->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
 256                 return -EINVAL;
 257         }
 258
 259         return 0;
 260 }
 261
 262 u32 ifcvf_get_config_size(struct ifcvf_hw *hw)
 263 {
 264         u32 net_config_size = sizeof(struct virtio_net_config);
 265         u32 blk_config_size = sizeof(struct virtio_blk_config);
 266         u32 cap_size = hw->cap_dev_config_size;
 267         u32 config_size;
 268
 269         /* If the onboard device config space size is greater than
 270          * the size of struct virtio_net/blk_config, only the spec
 271          * implementing contents size is returned, this is very
 272          * unlikely, defensive programming.
 273          */
 274         switch (hw->dev_type) {
 275         case VIRTIO_ID_NET:
 276                 config_size = min(cap_size, net_config_size);
 277                 break;
 278         case VIRTIO_ID_BLOCK:
 279                 config_size = min(cap_size, blk_config_size);
 280                 break;
 281         default:
 282                 config_size = 0;
 283                 IFCVF_ERR(hw->pdev, "VIRTIO ID %u not supported\n", hw->dev_type);
 284         }
 285
 286         return config_size;
 287 }
 288
 289 void ifcvf_read_dev_config(struct ifcvf_hw *hw, u64 offset,
 290                            void *dst, int length)
 291 {
 292         u8 old_gen, new_gen, *p;
 293         int i;
 294
 295         WARN_ON(offset + length > hw->config_size);
 296         do {
 297                 old_gen = vp_ioread8(&hw->common_cfg->config_generation);
 298                 p = dst;
 299                 for (i = 0; i < length; i++)
 300                         *p++ = vp_ioread8(hw->dev_cfg + offset + i);
 301
 302                 new_gen = vp_ioread8(&hw->common_cfg->config_generation);
 303         } while (old_gen != new_gen);
 304 }
 305
 306 void ifcvf_write_dev_config(struct ifcvf_hw *hw, u64 offset,
 307                             const void *src, int length)
 308 {
 309         const u8 *p;
 310         int i;
 311
 312         p = src;
 313         WARN_ON(offset + length > hw->config_size);
 314         for (i = 0; i < length; i++)
 315                 vp_iowrite8(*p++, hw->dev_cfg + offset + i);
 316 }
 317
 318 void ifcvf_set_driver_features(struct ifcvf_hw *hw, u64 features)
 319 {
 320         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 321
 322         vp_iowrite32(0, &cfg->guest_feature_select);
 323         vp_iowrite32((u32)features, &cfg->guest_feature);
 324
 325         vp_iowrite32(1, &cfg->guest_feature_select);
 326         vp_iowrite32(features >> 32, &cfg->guest_feature);
 327 }
 328
 329 u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
 330 {
 331         struct ifcvf_lm_cfg  __iomem *lm_cfg = hw->lm_cfg;
 332         u16 last_avail_idx;
 333
 334         last_avail_idx = vp_ioread16(&lm_cfg->vq_state_region + qid * 2);
 335
 336         return last_avail_idx;
 337 }
 338
 339 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
 340 {
 341         struct ifcvf_lm_cfg  __iomem *lm_cfg = hw->lm_cfg;
 342
 343         vp_iowrite16(num, &lm_cfg->vq_state_region + qid * 2);
 344
 345         return 0;
 346 }
 347
 348 void ifcvf_set_vq_num(struct ifcvf_hw *hw, u16 qid, u32 num)
 349 {
 350         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 351
 352         vp_iowrite16(qid, &cfg->queue_select);
 353         vp_iowrite16(num, &cfg->queue_size);
 354 }
 355
 356 int ifcvf_set_vq_address(struct ifcvf_hw *hw, u16 qid, u64 desc_area,
 357                          u64 driver_area, u64 device_area)
 358 {
 359         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 360
 361         vp_iowrite16(qid, &cfg->queue_select);
 362         vp_iowrite64_twopart(desc_area, &cfg->queue_desc_lo,
 363                              &cfg->queue_desc_hi);
 364         vp_iowrite64_twopart(driver_area, &cfg->queue_avail_lo,
 365                              &cfg->queue_avail_hi);
 366         vp_iowrite64_twopart(device_area, &cfg->queue_used_lo,
 367                              &cfg->queue_used_hi);
 368
 369         return 0;
 370 }
 371
 372 bool ifcvf_get_vq_ready(struct ifcvf_hw *hw, u16 qid)
 373 {
 374         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 375         u16 queue_enable;
 376
 377         vp_iowrite16(qid, &cfg->queue_select);
 378         queue_enable = vp_ioread16(&cfg->queue_enable);
 379
 380         return (bool)queue_enable;
 381 }
 382
 383 void ifcvf_set_vq_ready(struct ifcvf_hw *hw, u16 qid, bool ready)
 384 {
 385         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 386
 387         vp_iowrite16(qid, &cfg->queue_select);
 388         vp_iowrite16(ready, &cfg->queue_enable);
 389 }
 390
 391 static void ifcvf_reset_vring(struct ifcvf_hw *hw)
 392 {
 393         u16 qid;
 394
 395         for (qid = 0; qid < hw->nr_vring; qid++) {
 396                 hw->vring[qid].cb.callback = NULL;
 397                 hw->vring[qid].cb.private = NULL;
 398                 ifcvf_set_vq_vector(hw, qid, VIRTIO_MSI_NO_VECTOR);
 399         }
 400 }
 401
 402 static void ifcvf_reset_config_handler(struct ifcvf_hw *hw)
 403 {
 404         hw->config_cb.callback = NULL;
 405         hw->config_cb.private = NULL;
 406         ifcvf_set_config_vector(hw, VIRTIO_MSI_NO_VECTOR);
 407 }
 408
 409 static void ifcvf_synchronize_irq(struct ifcvf_hw *hw)
 410 {
 411         u32 nvectors = hw->num_msix_vectors;
 412         struct pci_dev *pdev = hw->pdev;
 413         int i, irq;
 414
 415         for (i = 0; i < nvectors; i++) {
 416                 irq = pci_irq_vector(pdev, i);
 417                 if (irq >= 0)
 418                         synchronize_irq(irq);
 419         }
 420 }
 421
 422 void ifcvf_stop(struct ifcvf_hw *hw)
 423 {
 424         ifcvf_synchronize_irq(hw);
 425         ifcvf_reset_vring(hw);
 426         ifcvf_reset_config_handler(hw);
 427 }
 428
 429 void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
 430 {
 431         vp_iowrite16(qid, hw->vring[qid].notify_addr);
 432 }