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