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11#include "ifcvf_base.h"
12
13static inline u8 ifc_ioread8(u8 __iomem *addr)
14{
15 return ioread8(addr);
16}
17static inline u16 ifc_ioread16 (__le16 __iomem *addr)
18{
19 return ioread16(addr);
20}
21
22static inline u32 ifc_ioread32(__le32 __iomem *addr)
23{
24 return ioread32(addr);
25}
26
27static inline void ifc_iowrite8(u8 value, u8 __iomem *addr)
28{
29 iowrite8(value, addr);
30}
31
32static inline void ifc_iowrite16(u16 value, __le16 __iomem *addr)
33{
34 iowrite16(value, addr);
35}
36
37static inline void ifc_iowrite32(u32 value, __le32 __iomem *addr)
38{
39 iowrite32(value, addr);
40}
41
42static 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
49struct ifcvf_adapter *vf_to_adapter(struct ifcvf_hw *hw)
50{
51 return container_of(hw, struct ifcvf_adapter, vf);
52}
53
54static 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
85static 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
99int 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 hw->notify_base_pa = pci_resource_start(pdev, cap.bar) +
137 le32_to_cpu(cap.offset);
138 IFCVF_DBG(pdev, "hw->notify_base = %p\n",
139 hw->notify_base);
140 break;
141 case VIRTIO_PCI_CAP_ISR_CFG:
142 hw->isr = get_cap_addr(hw, &cap);
143 IFCVF_DBG(pdev, "hw->isr = %p\n", hw->isr);
144 break;
145 case VIRTIO_PCI_CAP_DEVICE_CFG:
146 hw->net_cfg = get_cap_addr(hw, &cap);
147 IFCVF_DBG(pdev, "hw->net_cfg = %p\n", hw->net_cfg);
148 break;
149 }
150
151next:
152 pos = cap.cap_next;
153 }
154
155 if (hw->common_cfg == NULL || hw->notify_base == NULL ||
156 hw->isr == NULL || hw->net_cfg == NULL) {
157 IFCVF_ERR(pdev, "Incomplete PCI capabilities\n");
158 return -EIO;
159 }
160
161 for (i = 0; i < IFCVF_MAX_QUEUE_PAIRS * 2; i++) {
162 ifc_iowrite16(i, &hw->common_cfg->queue_select);
163 notify_off = ifc_ioread16(&hw->common_cfg->queue_notify_off);
164 hw->vring[i].notify_addr = hw->notify_base +
165 notify_off * hw->notify_off_multiplier;
166 hw->vring[i].notify_pa = hw->notify_base_pa +
167 notify_off * hw->notify_off_multiplier;
168 }
169
170 hw->lm_cfg = hw->base[IFCVF_LM_BAR];
171
172 IFCVF_DBG(pdev,
173 "PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n",
174 hw->common_cfg, hw->notify_base, hw->isr,
175 hw->net_cfg, hw->notify_off_multiplier);
176
177 return 0;
178}
179
180u8 ifcvf_get_status(struct ifcvf_hw *hw)
181{
182 return ifc_ioread8(&hw->common_cfg->device_status);
183}
184
185void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
186{
187 ifc_iowrite8(status, &hw->common_cfg->device_status);
188}
189
190void ifcvf_reset(struct ifcvf_hw *hw)
191{
192 hw->config_cb.callback = NULL;
193 hw->config_cb.private = NULL;
194
195 ifcvf_set_status(hw, 0);
196
197 ifcvf_get_status(hw);
198}
199
200static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
201{
202 if (status != 0)
203 status |= ifcvf_get_status(hw);
204
205 ifcvf_set_status(hw, status);
206 ifcvf_get_status(hw);
207}
208
209u64 ifcvf_get_hw_features(struct ifcvf_hw *hw)
210{
211 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
212 u32 features_lo, features_hi;
213 u64 features;
214
215 ifc_iowrite32(0, &cfg->device_feature_select);
216 features_lo = ifc_ioread32(&cfg->device_feature);
217
218 ifc_iowrite32(1, &cfg->device_feature_select);
219 features_hi = ifc_ioread32(&cfg->device_feature);
220
221 features = ((u64)features_hi << 32) | features_lo;
222
223 return features;
224}
225
226u64 ifcvf_get_features(struct ifcvf_hw *hw)
227{
228 return hw->hw_features;
229}
230
231int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features)
232{
233 struct ifcvf_adapter *ifcvf = vf_to_adapter(hw);
234
235 if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
236 IFCVF_ERR(ifcvf->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
237 return -EINVAL;
238 }
239
240 return 0;
241}
242
243void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
244 void *dst, int length)
245{
246 u8 old_gen, new_gen, *p;
247 int i;
248
249 WARN_ON(offset + length > sizeof(struct virtio_net_config));
250 do {
251 old_gen = ifc_ioread8(&hw->common_cfg->config_generation);
252 p = dst;
253 for (i = 0; i < length; i++)
254 *p++ = ifc_ioread8(hw->net_cfg + offset + i);
255
256 new_gen = ifc_ioread8(&hw->common_cfg->config_generation);
257 } while (old_gen != new_gen);
258}
259
260void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset,
261 const void *src, int length)
262{
263 const u8 *p;
264 int i;
265
266 p = src;
267 WARN_ON(offset + length > sizeof(struct virtio_net_config));
268 for (i = 0; i < length; i++)
269 ifc_iowrite8(*p++, hw->net_cfg + offset + i);
270}
271
272static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features)
273{
274 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
275
276 ifc_iowrite32(0, &cfg->guest_feature_select);
277 ifc_iowrite32((u32)features, &cfg->guest_feature);
278
279 ifc_iowrite32(1, &cfg->guest_feature_select);
280 ifc_iowrite32(features >> 32, &cfg->guest_feature);
281}
282
283static int ifcvf_config_features(struct ifcvf_hw *hw)
284{
285 struct ifcvf_adapter *ifcvf;
286
287 ifcvf = vf_to_adapter(hw);
288 ifcvf_set_features(hw, hw->req_features);
289 ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK);
290
291 if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) {
292 IFCVF_ERR(ifcvf->pdev, "Failed to set FEATURES_OK status\n");
293 return -EIO;
294 }
295
296 return 0;
297}
298
299u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
300{
301 struct ifcvf_lm_cfg __iomem *ifcvf_lm;
302 void __iomem *avail_idx_addr;
303 u16 last_avail_idx;
304 u32 q_pair_id;
305
306 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
307 q_pair_id = qid / (IFCVF_MAX_QUEUE_PAIRS * 2);
308 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
309 last_avail_idx = ifc_ioread16(avail_idx_addr);
310
311 return last_avail_idx;
312}
313
314int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
315{
316 struct ifcvf_lm_cfg __iomem *ifcvf_lm;
317 void __iomem *avail_idx_addr;
318 u32 q_pair_id;
319
320 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
321 q_pair_id = qid / (IFCVF_MAX_QUEUE_PAIRS * 2);
322 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
323 hw->vring[qid].last_avail_idx = num;
324 ifc_iowrite16(num, avail_idx_addr);
325
326 return 0;
327}
328
329static int ifcvf_hw_enable(struct ifcvf_hw *hw)
330{
331 struct virtio_pci_common_cfg __iomem *cfg;
332 struct ifcvf_adapter *ifcvf;
333 u32 i;
334
335 ifcvf = vf_to_adapter(hw);
336 cfg = hw->common_cfg;
337 ifc_iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config);
338
339 if (ifc_ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) {
340 IFCVF_ERR(ifcvf->pdev, "No msix vector for device config\n");
341 return -EINVAL;
342 }
343
344 for (i = 0; i < hw->nr_vring; i++) {
345 if (!hw->vring[i].ready)
346 break;
347
348 ifc_iowrite16(i, &cfg->queue_select);
349 ifc_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo,
350 &cfg->queue_desc_hi);
351 ifc_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo,
352 &cfg->queue_avail_hi);
353 ifc_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo,
354 &cfg->queue_used_hi);
355 ifc_iowrite16(hw->vring[i].size, &cfg->queue_size);
356 ifc_iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector);
357
358 if (ifc_ioread16(&cfg->queue_msix_vector) ==
359 VIRTIO_MSI_NO_VECTOR) {
360 IFCVF_ERR(ifcvf->pdev,
361 "No msix vector for queue %u\n", i);
362 return -EINVAL;
363 }
364
365 ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx);
366 ifc_iowrite16(1, &cfg->queue_enable);
367 }
368
369 return 0;
370}
371
372static void ifcvf_hw_disable(struct ifcvf_hw *hw)
373{
374 struct virtio_pci_common_cfg __iomem *cfg;
375 u32 i;
376
377 cfg = hw->common_cfg;
378 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config);
379
380 for (i = 0; i < hw->nr_vring; i++) {
381 ifc_iowrite16(i, &cfg->queue_select);
382 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector);
383 }
384
385 ifc_ioread16(&cfg->queue_msix_vector);
386}
387
388int ifcvf_start_hw(struct ifcvf_hw *hw)
389{
390 ifcvf_reset(hw);
391 ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE);
392 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER);
393
394 if (ifcvf_config_features(hw) < 0)
395 return -EINVAL;
396
397 if (ifcvf_hw_enable(hw) < 0)
398 return -EINVAL;
399
400 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK);
401
402 return 0;
403}
404
405void ifcvf_stop_hw(struct ifcvf_hw *hw)
406{
407 ifcvf_hw_disable(hw);
408 ifcvf_reset(hw);
409}
410
411void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
412{
413 ifc_iowrite16(qid, hw->vring[qid].notify_addr);
414}
415
