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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Intel IFC VF NIC driver for virtio dataplane offloading4 *5 * Copyright (C) 2020 Intel Corporation.6 *7 * Author: Zhu Lingshan <lingshan.zhu@intel.com>8 *9 */10 11#include "ifcvf_base.h"12 13u16 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 23u16 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 32static 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 58static 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 72u16 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 85u16 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 102int 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 156next: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 194u8 ifcvf_get_status(struct ifcvf_hw *hw)195{196 return vp_ioread8(&hw->common_cfg->device_status);197}198 199void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)200{201 vp_iowrite8(status, &hw->common_cfg->device_status);202}203 204void ifcvf_reset(struct ifcvf_hw *hw)205{206 ifcvf_set_status(hw, 0);207 while (ifcvf_get_status(hw))208 msleep(1);209}210 211u64 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 */229u64 ifcvf_get_dev_features(struct ifcvf_hw *hw)230{231 return hw->dev_features;232}233 234u64 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 251int 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 261u32 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 than269 * the size of struct virtio_net/blk_config, only the spec270 * implementing contents size is returned, this is very271 * 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 288void 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 305void 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 317void 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 328u16 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 338int 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 347void 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 355int 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 371bool 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 382void 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 390static 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 401static 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 408static 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 421void 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 428void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)429{430 vp_iowrite16(qid, hw->vring[qid].notify_addr);431}432