1 // SPDX-License-Identifier: GPL-2.0-only
3 * Intel IFC VF NIC driver for virtio dataplane offloading
5 * Copyright (C) 2020 Intel Corporation.
7 * Author: Zhu Lingshan <lingshan.zhu@intel.com>
11 #include "ifcvf_base.h"
13 u16 ifcvf_set_vq_vector(struct ifcvf_hw *hw, u16 qid, int vector)
15 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
17 vp_iowrite16(qid, &cfg->queue_select);
18 vp_iowrite16(vector, &cfg->queue_msix_vector);
20 return vp_ioread16(&cfg->queue_msix_vector);
23 u16 ifcvf_set_config_vector(struct ifcvf_hw *hw, int vector)
25 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
27 vp_iowrite16(vector, &cfg->msix_config);
29 return vp_ioread16(&cfg->msix_config);
32 static void __iomem *get_cap_addr(struct ifcvf_hw *hw,
33 struct virtio_pci_cap *cap)
38 length = le32_to_cpu(cap->length);
39 offset = le32_to_cpu(cap->offset);
42 if (bar >= IFCVF_PCI_MAX_RESOURCE) {
44 "Invalid bar number %u to get capabilities\n", bar);
48 if (offset + length > pci_resource_len(hw->pdev, bar)) {
50 "offset(%u) + len(%u) overflows bar%u's capability\n",
55 return hw->base[bar] + offset;
58 static int ifcvf_read_config_range(struct pci_dev *dev,
59 uint32_t *val, int size, int where)
63 for (i = 0; i < size; i += 4) {
64 ret = pci_read_config_dword(dev, where + i, val + i / 4);
72 static u16 ifcvf_get_vq_size(struct ifcvf_hw *hw, u16 qid)
76 vp_iowrite16(qid, &hw->common_cfg->queue_select);
77 queue_size = vp_ioread16(&hw->common_cfg->queue_size);
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.
86 u16 ifcvf_get_max_vq_size(struct ifcvf_hw *hw)
88 u16 queue_size, max_size, qid;
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 */
97 max_size = min(queue_size, max_size);
103 int ifcvf_init_hw(struct ifcvf_hw *hw, struct pci_dev *pdev)
105 struct virtio_pci_cap cap;
111 ret = pci_read_config_byte(pdev, PCI_CAPABILITY_LIST, &pos);
113 IFCVF_ERR(pdev, "Failed to read PCI capability list\n");
119 ret = ifcvf_read_config_range(pdev, (u32 *)&cap,
123 "Failed to get PCI capability at %x\n", pos);
127 if (cap.cap_vndr != PCI_CAP_ID_VNDR)
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",
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",
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);
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);
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");
167 hw->nr_vring = vp_ioread16(&hw->common_cfg->num_queues);
168 hw->vring = kzalloc(sizeof(struct vring_info) * hw->nr_vring, GFP_KERNEL);
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;
182 hw->lm_cfg = hw->base[IFCVF_LM_BAR];
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);
189 hw->vqs_reused_irq = -EINVAL;
190 hw->config_irq = -EINVAL;
195 u8 ifcvf_get_status(struct ifcvf_hw *hw)
197 return vp_ioread8(&hw->common_cfg->device_status);
200 void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
202 vp_iowrite8(status, &hw->common_cfg->device_status);
205 void ifcvf_reset(struct ifcvf_hw *hw)
207 ifcvf_set_status(hw, 0);
208 while (ifcvf_get_status(hw))
212 u64 ifcvf_get_hw_features(struct ifcvf_hw *hw)
214 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
215 u32 features_lo, features_hi;
218 vp_iowrite32(0, &cfg->device_feature_select);
219 features_lo = vp_ioread32(&cfg->device_feature);
221 vp_iowrite32(1, &cfg->device_feature_select);
222 features_hi = vp_ioread32(&cfg->device_feature);
224 features = ((u64)features_hi << 32) | features_lo;
229 /* return provisioned vDPA dev features */
230 u64 ifcvf_get_dev_features(struct ifcvf_hw *hw)
232 return hw->dev_features;
235 u64 ifcvf_get_driver_features(struct ifcvf_hw *hw)
237 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
238 u32 features_lo, features_hi;
241 vp_iowrite32(0, &cfg->device_feature_select);
242 features_lo = vp_ioread32(&cfg->guest_feature);
244 vp_iowrite32(1, &cfg->device_feature_select);
245 features_hi = vp_ioread32(&cfg->guest_feature);
247 features = ((u64)features_hi << 32) | features_lo;
252 int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features)
254 if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
255 IFCVF_ERR(hw->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
262 u32 ifcvf_get_config_size(struct ifcvf_hw *hw)
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;
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.
274 switch (hw->dev_type) {
276 config_size = min(cap_size, net_config_size);
278 case VIRTIO_ID_BLOCK:
279 config_size = min(cap_size, blk_config_size);
283 IFCVF_ERR(hw->pdev, "VIRTIO ID %u not supported\n", hw->dev_type);
289 void ifcvf_read_dev_config(struct ifcvf_hw *hw, u64 offset,
290 void *dst, int length)
292 u8 old_gen, new_gen, *p;
295 WARN_ON(offset + length > hw->config_size);
297 old_gen = vp_ioread8(&hw->common_cfg->config_generation);
299 for (i = 0; i < length; i++)
300 *p++ = vp_ioread8(hw->dev_cfg + offset + i);
302 new_gen = vp_ioread8(&hw->common_cfg->config_generation);
303 } while (old_gen != new_gen);
306 void ifcvf_write_dev_config(struct ifcvf_hw *hw, u64 offset,
307 const void *src, int length)
313 WARN_ON(offset + length > hw->config_size);
314 for (i = 0; i < length; i++)
315 vp_iowrite8(*p++, hw->dev_cfg + offset + i);
318 void ifcvf_set_driver_features(struct ifcvf_hw *hw, u64 features)
320 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
322 vp_iowrite32(0, &cfg->guest_feature_select);
323 vp_iowrite32((u32)features, &cfg->guest_feature);
325 vp_iowrite32(1, &cfg->guest_feature_select);
326 vp_iowrite32(features >> 32, &cfg->guest_feature);
329 u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
331 struct ifcvf_lm_cfg __iomem *lm_cfg = hw->lm_cfg;
334 last_avail_idx = vp_ioread16(&lm_cfg->vq_state_region + qid * 2);
336 return last_avail_idx;
339 int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
341 struct ifcvf_lm_cfg __iomem *lm_cfg = hw->lm_cfg;
343 vp_iowrite16(num, &lm_cfg->vq_state_region + qid * 2);
348 void ifcvf_set_vq_num(struct ifcvf_hw *hw, u16 qid, u32 num)
350 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
352 vp_iowrite16(qid, &cfg->queue_select);
353 vp_iowrite16(num, &cfg->queue_size);
356 int ifcvf_set_vq_address(struct ifcvf_hw *hw, u16 qid, u64 desc_area,
357 u64 driver_area, u64 device_area)
359 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
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);
372 bool ifcvf_get_vq_ready(struct ifcvf_hw *hw, u16 qid)
374 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
377 vp_iowrite16(qid, &cfg->queue_select);
378 queue_enable = vp_ioread16(&cfg->queue_enable);
380 return (bool)queue_enable;
383 void ifcvf_set_vq_ready(struct ifcvf_hw *hw, u16 qid, bool ready)
385 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
387 vp_iowrite16(qid, &cfg->queue_select);
388 vp_iowrite16(ready, &cfg->queue_enable);
391 static void ifcvf_reset_vring(struct ifcvf_hw *hw)
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);
402 static void ifcvf_reset_config_handler(struct ifcvf_hw *hw)
404 hw->config_cb.callback = NULL;
405 hw->config_cb.private = NULL;
406 ifcvf_set_config_vector(hw, VIRTIO_MSI_NO_VECTOR);
409 static void ifcvf_synchronize_irq(struct ifcvf_hw *hw)
411 u32 nvectors = hw->num_msix_vectors;
412 struct pci_dev *pdev = hw->pdev;
415 for (i = 0; i < nvectors; i++) {
416 irq = pci_irq_vector(pdev, i);
418 synchronize_irq(irq);
422 void ifcvf_stop(struct ifcvf_hw *hw)
424 ifcvf_synchronize_irq(hw);
425 ifcvf_reset_vring(hw);
426 ifcvf_reset_config_handler(hw);
429 void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
431 vp_iowrite16(qid, hw->vring[qid].notify_addr);