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 static inline u8 ifc_ioread8(u8 __iomem *addr)
  14 {
  15         return ioread8(addr);
  16 }
  17 static inline u16 ifc_ioread16 (__le16 __iomem *addr)
  18 {
  19         return ioread16(addr);
  20 }
  21
  22 static inline u32 ifc_ioread32(__le32 __iomem *addr)
  23 {
  24         return ioread32(addr);
  25 }
  26
  27 static inline void ifc_iowrite8(u8 value, u8 __iomem *addr)
  28 {
  29         iowrite8(value, addr);
  30 }
  31
  32 static inline void ifc_iowrite16(u16 value, __le16 __iomem *addr)
  33 {
  34         iowrite16(value, addr);
  35 }
  36
  37 static inline void ifc_iowrite32(u32 value, __le32 __iomem *addr)
  38 {
  39         iowrite32(value, addr);
  40 }
  41
  42 static void ifc_iowrite64_twopart(u64 val,
  43                                   __le32 __iomem *lo, __le32 __iomem *hi)
  44 {
  45         ifc_iowrite32((u32)val, lo);
  46         ifc_iowrite32(val >> 32, hi);
  47 }
  48
  49 struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw)
  50 {
  51         return container_of(hw, struct ifcvf_adapter, vf);
  52 }
  53
  54 static void __iomem *get_cap_addr(struct ifcvf_hw *hw,
  55                                   struct virtio_pci_cap *cap)
  56 {
  57         struct ifcvf_adapter *ifcvf;
  58         struct pci_dev *pdev;
  59         u32 length, offset;
  60         u8 bar;
  61
  62         length = le32_to_cpu(cap->length);
  63         offset = le32_to_cpu(cap->offset);
  64         bar = cap->bar;
  65
  66         ifcvf= vf_to_adapter(hw);
  67         pdev = ifcvf->pdev;
  68
  69         if (bar >= IFCVF_PCI_MAX_RESOURCE) {
  70                 IFCVF_DBG(pdev,
  71                           "Invalid bar number %u to get capabilities\n", bar);
  72                 return NULL;
  73         }
  74
  75         if (offset + length > pci_resource_len(pdev, bar)) {
  76                 IFCVF_DBG(pdev,
  77                           "offset(%u) + len(%u) overflows bar%u's capability\n",
  78                           offset, length, bar);
  79                 return NULL;
  80         }
  81
  82         return hw->base[bar] + offset;
  83 }
  84
  85 static int ifcvf_read_config_range(struct pci_dev *dev,
  86                                    uint32_t *val, int size, int where)
  87 {
  88         int ret, i;
  89
  90         for (i = 0; i < size; i += 4) {
  91                 ret = pci_read_config_dword(dev, where + i, val + i / 4);
  92                 if (ret < 0)
  93                         return ret;
  94         }
  95
  96         return 0;
  97 }
  98
  99 int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
 100 {
 101         struct virtio_pci_cap cap;
 102         u16 notify_off;
 103         int ret;
 104         u8 pos;
 105         u32 i;
 106
 107         ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos);
 108         if (ret < 0) {
 109                 IFCVF_ERR(pdev, "Failed to read PCI capability list\n");
 110                 return -EIO;
 111         }
 112
 113         while (pos) {
 114                 ret = ifcvf_read_config_range(pdev, (u32 *)&cap,
 115                                               sizeof(cap), pos);
 116                 if (ret < 0) {
 117                         IFCVF_ERR(pdev,
 118                                   "Failed to get PCI capability at %x\n", pos);
 119                         break;
 120                 }
 121
 122                 if (cap.cap_vndr != PCI_CAP_ID_VNDR)
 123                         goto next;
 124
 125                 switch (cap.cfg_type) {
 126                 case VIRTIO_PCI_CAP_COMMON_CFG:
 127                         hw->common_cfg = get_cap_addr(hw, &cap);
 128                         IFCVF_DBG(pdev, "hw->common_cfg = %p\n",
 129                                   hw->common_cfg);
 130                         break;
 131                 case VIRTIO_PCI_CAP_NOTIFY_CFG:
 132                         pci_read_config_dword(pdev, pos + sizeof(cap),
 133                                               &hw->notify_off_multiplier);
 134                         hw->notify_bar = cap.bar;
 135                         hw->notify_base = get_cap_addr(hw, &cap);
 136                         IFCVF_DBG(pdev, "hw->notify_base = %p\n",
 137                                   hw->notify_base);
 138                         break;
 139                 case VIRTIO_PCI_CAP_ISR_CFG:
 140                         hw->isr = get_cap_addr(hw, &cap);
 141                         IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr);
 142                         break;
 143                 case VIRTIO_PCI_CAP_DEVICE_CFG:
 144                         hw->net_cfg = get_cap_addr(hw, &cap);
 145                         IFCVF_DBG(pdev, "hw->net_cfg = %p\n", hw->net_cfg);
 146                         break;
 147                 }
 148
 149 next:
 150                 pos = cap.cap_next;
 151         }
 152
 153         if (hw->common_cfg == NULL || hw->notify_base == NULL ||
 154             hw->isr == NULL || hw->net_cfg == NULL) {
 155                 IFCVF_ERR(pdev, "Incomplete PCI capabilities\n");
 156                 return -EIO;
 157         }
 158
 159         for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
 160                 ifc_iowrite16(i, &hw->common_cfg->queue_select);
 161                 notify_off = ifc_ioread16(&hw->common_cfg->queue_notify_off);
 162                 hw->vring[i].notify_addr = hw->notify_base +
 163                         notify_off * hw->notify_off_multiplier;
 164         }
 165
 166         hw->lm_cfg = hw->base[IFCVF_LM_BAR];
 167
 168         IFCVF_DBG(pdev,
 169                   "PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n",
 170                   hw->common_cfg, hw->notify_base, hw->isr,
 171                   hw->net_cfg, hw->notify_off_multiplier);
 172
 173         return 0;
 174 }
 175
 176 u8 ifcvf_get_status(struct ifcvf_hw *hw)
 177 {
 178         return ifc_ioread8(&hw->common_cfg->device_status);
 179 }
 180
 181 void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
 182 {
 183         ifc_iowrite8(status, &hw->common_cfg->device_status);
 184 }
 185
 186 void ifcvf_reset(struct ifcvf_hw *hw)
 187 {
 188         hw->config_cb.callback = NULL;
 189         hw->config_cb.private = NULL;
 190
 191         ifcvf_set_status(hw, 0);
 192         /* flush set_status, make sure VF is stopped, reset */
 193         ifcvf_get_status(hw);
 194 }
 195
 196 static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
 197 {
 198         if (status != 0)
 199                 status |= ifcvf_get_status(hw);
 200
 201         ifcvf_set_status(hw, status);
 202         ifcvf_get_status(hw);
 203 }
 204
 205 u64 ifcvf_get_hw_features(struct ifcvf_hw *hw)
 206 {
 207         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 208         u32 features_lo, features_hi;
 209         u64 features;
 210
 211         ifc_iowrite32(0, &cfg->device_feature_select);
 212         features_lo = ifc_ioread32(&cfg->device_feature);
 213
 214         ifc_iowrite32(1, &cfg->device_feature_select);
 215         features_hi = ifc_ioread32(&cfg->device_feature);
 216
 217         features = ((u64)features_hi << 32) | features_lo;
 218
 219         return features;
 220 }
 221
 222 u64 ifcvf_get_features(struct ifcvf_hw *hw)
 223 {
 224         return hw->hw_features;
 225 }
 226
 227 int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features)
 228 {
 229         struct ifcvf_adapter *ifcvf = vf_to_adapter(hw);
 230
 231         if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
 232                 IFCVF_ERR(ifcvf->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
 233                 return -EINVAL;
 234         }
 235
 236         return 0;
 237 }
 238
 239 void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
 240                            void *dst, int length)
 241 {
 242         u8 old_gen, new_gen, *p;
 243         int i;
 244
 245         WARN_ON(offset + length > sizeof(struct virtio_net_config));
 246         do {
 247                 old_gen = ifc_ioread8(&hw->common_cfg->config_generation);
 248                 p = dst;
 249                 for (i = 0; i < length; i++)
 250                         *p++ = ifc_ioread8(hw->net_cfg + offset + i);
 251
 252                 new_gen = ifc_ioread8(&hw->common_cfg->config_generation);
 253         } while (old_gen != new_gen);
 254 }
 255
 256 void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset,
 257                             const void *src, int length)
 258 {
 259         const u8 *p;
 260         int i;
 261
 262         p = src;
 263         WARN_ON(offset + length > sizeof(struct virtio_net_config));
 264         for (i = 0; i < length; i++)
 265                 ifc_iowrite8(*p++, hw->net_cfg + offset + i);
 266 }
 267
 268 static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features)
 269 {
 270         struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
 271
 272         ifc_iowrite32(0, &cfg->guest_feature_select);
 273         ifc_iowrite32((u32)features, &cfg->guest_feature);
 274
 275         ifc_iowrite32(1, &cfg->guest_feature_select);
 276         ifc_iowrite32(features >> 32, &cfg->guest_feature);
 277 }
 278
 279 static int ifcvf_config_features(struct ifcvf_hw *hw)
 280 {
 281         struct ifcvf_adapter *ifcvf;
 282
 283         ifcvf = vf_to_adapter(hw);
 284         ifcvf_set_features(hw, hw->req_features);
 285         ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK);
 286
 287         if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) {
 288                 IFCVF_ERR(ifcvf->pdev, "Failed to set FEATURES_OK status\n");
 289                 return -EIO;
 290         }
 291
 292         return 0;
 293 }
 294
 295 u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
 296 {
 297         struct ifcvf_lm_cfg __iomem *ifcvf_lm;
 298         void __iomem *avail_idx_addr;
 299         u16 last_avail_idx;
 300         u32 q_pair_id;
 301
 302         ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
 303         q_pair_id = qid / (IFCVF_MAX_QUEUE_PAIRS * 2);
 304         avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
 305         last_avail_idx = ifc_ioread16(avail_idx_addr);
 306
 307         return last_avail_idx;
 308 }
 309
 310 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
 311 {
 312         struct ifcvf_lm_cfg __iomem *ifcvf_lm;
 313         void __iomem *avail_idx_addr;
 314         u32 q_pair_id;
 315
 316         ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
 317         q_pair_id = qid / (IFCVF_MAX_QUEUE_PAIRS * 2);
 318         avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
 319         hw->vring[qid].last_avail_idx = num;
 320         ifc_iowrite16(num, avail_idx_addr);
 321
 322         return 0;
 323 }
 324
 325 static int ifcvf_hw_enable(struct ifcvf_hw *hw)
 326 {
 327         struct virtio_pci_common_cfg __iomem *cfg;
 328         struct ifcvf_adapter *ifcvf;
 329         u32 i;
 330
 331         ifcvf = vf_to_adapter(hw);
 332         cfg = hw->common_cfg;
 333         ifc_iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config);
 334
 335         if (ifc_ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) {
 336                 IFCVF_ERR(ifcvf->pdev, "No msix vector for device config\n");
 337                 return -EINVAL;
 338         }
 339
 340         for (i = 0; i < hw->nr_vring; i++) {
 341                 if (!hw->vring[i].ready)
 342                         break;
 343
 344                 ifc_iowrite16(i, &cfg->queue_select);
 345                 ifc_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo,
 346                                      &cfg->queue_desc_hi);
 347                 ifc_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo,
 348                                       &cfg->queue_avail_hi);
 349                 ifc_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo,
 350                                      &cfg->queue_used_hi);
 351                 ifc_iowrite16(hw->vring[i].size, &cfg->queue_size);
 352                 ifc_iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector);
 353
 354                 if (ifc_ioread16(&cfg->queue_msix_vector) ==
 355                     VIRTIO_MSI_NO_VECTOR) {
 356                         IFCVF_ERR(ifcvf->pdev,
 357                                   "No msix vector for queue %u\n", i);
 358                         return -EINVAL;
 359                 }
 360
 361                 ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx);
 362                 ifc_iowrite16(1, &cfg->queue_enable);
 363         }
 364
 365         return 0;
 366 }
 367
 368 static void ifcvf_hw_disable(struct ifcvf_hw *hw)
 369 {
 370         struct virtio_pci_common_cfg __iomem *cfg;
 371         u32 i;
 372
 373         cfg = hw->common_cfg;
 374         ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config);
 375
 376         for (i = 0; i < hw->nr_vring; i++) {
 377                 ifc_iowrite16(i, &cfg->queue_select);
 378                 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector);
 379         }
 380
 381         ifc_ioread16(&cfg->queue_msix_vector);
 382 }
 383
 384 int ifcvf_start_hw(struct ifcvf_hw *hw)
 385 {
 386         ifcvf_reset(hw);
 387         ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE);
 388         ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER);
 389
 390         if (ifcvf_config_features(hw) < 0)
 391                 return -EINVAL;
 392
 393         if (ifcvf_hw_enable(hw) < 0)
 394                 return -EINVAL;
 395
 396         ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK);
 397
 398         return 0;
 399 }
 400
 401 void ifcvf_stop_hw(struct ifcvf_hw *hw)
 402 {
 403         ifcvf_hw_disable(hw);
 404         ifcvf_reset(hw);
 405 }
 406
 407 void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
 408 {
 409         ifc_iowrite16(qid, hw->vring[qid].notify_addr);
 410 }