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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 hw->nr_vring = ifc_ioread16(&hw->common_cfg->num_queues);
162
163 for (i = 0; i < hw->nr_vring; i++) {
164 ifc_iowrite16(i, &hw->common_cfg->queue_select);
165 notify_off = ifc_ioread16(&hw->common_cfg->queue_notify_off);
166 hw->vring[i].notify_addr = hw->notify_base +
167 notify_off * hw->notify_off_multiplier;
168 hw->vring[i].notify_pa = hw->notify_base_pa +
169 notify_off * hw->notify_off_multiplier;
170 }
171
172 hw->lm_cfg = hw->base[IFCVF_LM_BAR];
173
174 IFCVF_DBG(pdev,
175 "PCI capability mapping: common cfg: %p, notify base: %p\n, isr cfg: %p, device cfg: %p, multiplier: %u\n",
176 hw->common_cfg, hw->notify_base, hw->isr,
177 hw->net_cfg, hw->notify_off_multiplier);
178
179 return 0;
180}
181
182u8 ifcvf_get_status(struct ifcvf_hw *hw)
183{
184 return ifc_ioread8(&hw->common_cfg->device_status);
185}
186
187void ifcvf_set_status(struct ifcvf_hw *hw, u8 status)
188{
189 ifc_iowrite8(status, &hw->common_cfg->device_status);
190}
191
192void ifcvf_reset(struct ifcvf_hw *hw)
193{
194 hw->config_cb.callback = NULL;
195 hw->config_cb.private = NULL;
196
197 ifcvf_set_status(hw, 0);
198
199 ifcvf_get_status(hw);
200}
201
202static void ifcvf_add_status(struct ifcvf_hw *hw, u8 status)
203{
204 if (status != 0)
205 status |= ifcvf_get_status(hw);
206
207 ifcvf_set_status(hw, status);
208 ifcvf_get_status(hw);
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 ifc_iowrite32(0, &cfg->device_feature_select);
218 features_lo = ifc_ioread32(&cfg->device_feature);
219
220 ifc_iowrite32(1, &cfg->device_feature_select);
221 features_hi = ifc_ioread32(&cfg->device_feature);
222
223 features = ((u64)features_hi << 32) | features_lo;
224
225 return features;
226}
227
228u64 ifcvf_get_features(struct ifcvf_hw *hw)
229{
230 return hw->hw_features;
231}
232
233int ifcvf_verify_min_features(struct ifcvf_hw *hw, u64 features)
234{
235 struct ifcvf_adapter *ifcvf = vf_to_adapter(hw);
236
237 if (!(features & BIT_ULL(VIRTIO_F_ACCESS_PLATFORM)) && features) {
238 IFCVF_ERR(ifcvf->pdev, "VIRTIO_F_ACCESS_PLATFORM is not negotiated\n");
239 return -EINVAL;
240 }
241
242 return 0;
243}
244
245void ifcvf_read_net_config(struct ifcvf_hw *hw, u64 offset,
246 void *dst, int length)
247{
248 u8 old_gen, new_gen, *p;
249 int i;
250
251 WARN_ON(offset + length > sizeof(struct virtio_net_config));
252 do {
253 old_gen = ifc_ioread8(&hw->common_cfg->config_generation);
254 p = dst;
255 for (i = 0; i < length; i++)
256 *p++ = ifc_ioread8(hw->net_cfg + offset + i);
257
258 new_gen = ifc_ioread8(&hw->common_cfg->config_generation);
259 } while (old_gen != new_gen);
260}
261
262void ifcvf_write_net_config(struct ifcvf_hw *hw, u64 offset,
263 const void *src, int length)
264{
265 const u8 *p;
266 int i;
267
268 p = src;
269 WARN_ON(offset + length > sizeof(struct virtio_net_config));
270 for (i = 0; i < length; i++)
271 ifc_iowrite8(*p++, hw->net_cfg + offset + i);
272}
273
274static void ifcvf_set_features(struct ifcvf_hw *hw, u64 features)
275{
276 struct virtio_pci_common_cfg __iomem *cfg = hw->common_cfg;
277
278 ifc_iowrite32(0, &cfg->guest_feature_select);
279 ifc_iowrite32((u32)features, &cfg->guest_feature);
280
281 ifc_iowrite32(1, &cfg->guest_feature_select);
282 ifc_iowrite32(features >> 32, &cfg->guest_feature);
283}
284
285static int ifcvf_config_features(struct ifcvf_hw *hw)
286{
287 struct ifcvf_adapter *ifcvf;
288
289 ifcvf = vf_to_adapter(hw);
290 ifcvf_set_features(hw, hw->req_features);
291 ifcvf_add_status(hw, VIRTIO_CONFIG_S_FEATURES_OK);
292
293 if (!(ifcvf_get_status(hw) & VIRTIO_CONFIG_S_FEATURES_OK)) {
294 IFCVF_ERR(ifcvf->pdev, "Failed to set FEATURES_OK status\n");
295 return -EIO;
296 }
297
298 return 0;
299}
300
301u16 ifcvf_get_vq_state(struct ifcvf_hw *hw, u16 qid)
302{
303 struct ifcvf_lm_cfg __iomem *ifcvf_lm;
304 void __iomem *avail_idx_addr;
305 u16 last_avail_idx;
306 u32 q_pair_id;
307
308 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
309 q_pair_id = qid / hw->nr_vring;
310 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
311 last_avail_idx = ifc_ioread16(avail_idx_addr);
312
313 return last_avail_idx;
314}
315
316int ifcvf_set_vq_state(struct ifcvf_hw *hw, u16 qid, u16 num)
317{
318 struct ifcvf_lm_cfg __iomem *ifcvf_lm;
319 void __iomem *avail_idx_addr;
320 u32 q_pair_id;
321
322 ifcvf_lm = (struct ifcvf_lm_cfg __iomem *)hw->lm_cfg;
323 q_pair_id = qid / hw->nr_vring;
324 avail_idx_addr = &ifcvf_lm->vring_lm_cfg[q_pair_id].idx_addr[qid % 2];
325 hw->vring[qid].last_avail_idx = num;
326 ifc_iowrite16(num, avail_idx_addr);
327
328 return 0;
329}
330
331static int ifcvf_hw_enable(struct ifcvf_hw *hw)
332{
333 struct virtio_pci_common_cfg __iomem *cfg;
334 struct ifcvf_adapter *ifcvf;
335 u32 i;
336
337 ifcvf = vf_to_adapter(hw);
338 cfg = hw->common_cfg;
339 ifc_iowrite16(IFCVF_MSI_CONFIG_OFF, &cfg->msix_config);
340
341 if (ifc_ioread16(&cfg->msix_config) == VIRTIO_MSI_NO_VECTOR) {
342 IFCVF_ERR(ifcvf->pdev, "No msix vector for device config\n");
343 return -EINVAL;
344 }
345
346 for (i = 0; i < hw->nr_vring; i++) {
347 if (!hw->vring[i].ready)
348 break;
349
350 ifc_iowrite16(i, &cfg->queue_select);
351 ifc_iowrite64_twopart(hw->vring[i].desc, &cfg->queue_desc_lo,
352 &cfg->queue_desc_hi);
353 ifc_iowrite64_twopart(hw->vring[i].avail, &cfg->queue_avail_lo,
354 &cfg->queue_avail_hi);
355 ifc_iowrite64_twopart(hw->vring[i].used, &cfg->queue_used_lo,
356 &cfg->queue_used_hi);
357 ifc_iowrite16(hw->vring[i].size, &cfg->queue_size);
358 ifc_iowrite16(i + IFCVF_MSI_QUEUE_OFF, &cfg->queue_msix_vector);
359
360 if (ifc_ioread16(&cfg->queue_msix_vector) ==
361 VIRTIO_MSI_NO_VECTOR) {
362 IFCVF_ERR(ifcvf->pdev,
363 "No msix vector for queue %u\n", i);
364 return -EINVAL;
365 }
366
367 ifcvf_set_vq_state(hw, i, hw->vring[i].last_avail_idx);
368 ifc_iowrite16(1, &cfg->queue_enable);
369 }
370
371 return 0;
372}
373
374static void ifcvf_hw_disable(struct ifcvf_hw *hw)
375{
376 struct virtio_pci_common_cfg __iomem *cfg;
377 u32 i;
378
379 cfg = hw->common_cfg;
380 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->msix_config);
381
382 for (i = 0; i < hw->nr_vring; i++) {
383 ifc_iowrite16(i, &cfg->queue_select);
384 ifc_iowrite16(VIRTIO_MSI_NO_VECTOR, &cfg->queue_msix_vector);
385 }
386
387 ifc_ioread16(&cfg->queue_msix_vector);
388}
389
390int ifcvf_start_hw(struct ifcvf_hw *hw)
391{
392 ifcvf_reset(hw);
393 ifcvf_add_status(hw, VIRTIO_CONFIG_S_ACKNOWLEDGE);
394 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER);
395
396 if (ifcvf_config_features(hw) < 0)
397 return -EINVAL;
398
399 if (ifcvf_hw_enable(hw) < 0)
400 return -EINVAL;
401
402 ifcvf_add_status(hw, VIRTIO_CONFIG_S_DRIVER_OK);
403
404 return 0;
405}
406
407void ifcvf_stop_hw(struct ifcvf_hw *hw)
408{
409 ifcvf_hw_disable(hw);
410 ifcvf_reset(hw);
411}
412
413void ifcvf_notify_queue(struct ifcvf_hw *hw, u16 qid)
414{
415 ifc_iowrite16(qid, hw->vring[qid].notify_addr);
416}
417
