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1// SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
2/* Copyright(c) 2015 - 2021 Intel Corporation */
3#include <linux/bitfield.h>
4#include <linux/spinlock.h>
5#include <linux/types.h>
6#include "adf_accel_devices.h"
7#include "adf_common_drv.h"
8#include "adf_pfvf_msg.h"
9#include "adf_pfvf_pf_msg.h"
10#include "adf_pfvf_pf_proto.h"
11#include "adf_pfvf_utils.h"
12
13typedef u8 (*pf2vf_blkmsg_data_getter_fn)(u8 const *blkmsg, u8 byte);
14
15static const adf_pf2vf_blkmsg_provider pf2vf_blkmsg_providers[] = {
16 NULL, /* no message type defined for value 0 */
17 NULL, /* no message type defined for value 1 */
18 adf_pf_capabilities_msg_provider, /* ADF_VF2PF_BLKMSG_REQ_CAP_SUMMARY */
19 adf_pf_ring_to_svc_msg_provider, /* ADF_VF2PF_BLKMSG_REQ_RING_SVC_MAP */
20};
21
22/**
23 * adf_send_pf2vf_msg() - send PF to VF message
24 * @accel_dev: Pointer to acceleration device
25 * @vf_nr: VF number to which the message will be sent
26 * @msg: Message to send
27 *
28 * This function allows the PF to send a message to a specific VF.
29 *
30 * Return: 0 on success, error code otherwise.
31 */
32int adf_send_pf2vf_msg(struct adf_accel_dev *accel_dev, u8 vf_nr, struct pfvf_message msg)
33{
34 struct adf_pfvf_ops *pfvf_ops = GET_PFVF_OPS(accel_dev);
35 u32 pfvf_offset = pfvf_ops->get_pf2vf_offset(vf_nr);
36
37 return pfvf_ops->send_msg(accel_dev, msg, pfvf_offset,
38 &accel_dev->pf.vf_info[vf_nr].pf2vf_lock);
39}
40
41/**
42 * adf_recv_vf2pf_msg() - receive a VF to PF message
43 * @accel_dev: Pointer to acceleration device
44 * @vf_nr: Number of the VF from where the message will be received
45 *
46 * This function allows the PF to receive a message from a specific VF.
47 *
48 * Return: a valid message on success, zero otherwise.
49 */
50static struct pfvf_message adf_recv_vf2pf_msg(struct adf_accel_dev *accel_dev, u8 vf_nr)
51{
52 struct adf_accel_vf_info *vf_info = &accel_dev->pf.vf_info[vf_nr];
53 struct adf_pfvf_ops *pfvf_ops = GET_PFVF_OPS(accel_dev);
54 u32 pfvf_offset = pfvf_ops->get_vf2pf_offset(vf_nr);
55
56 return pfvf_ops->recv_msg(accel_dev, pfvf_offset, vf_info->vf_compat_ver);
57}
58
59static adf_pf2vf_blkmsg_provider get_blkmsg_response_provider(u8 type)
60{
61 if (type >= ARRAY_SIZE(pf2vf_blkmsg_providers))
62 return NULL;
63
64 return pf2vf_blkmsg_providers[type];
65}
66
67/* Byte pf2vf_blkmsg_data_getter_fn callback */
68static u8 adf_pf2vf_blkmsg_get_byte(u8 const *blkmsg, u8 index)
69{
70 return blkmsg[index];
71}
72
73/* CRC pf2vf_blkmsg_data_getter_fn callback */
74static u8 adf_pf2vf_blkmsg_get_crc(u8 const *blkmsg, u8 count)
75{
76 /* count is 0-based, turn it into a length */
77 return adf_pfvf_calc_blkmsg_crc(blkmsg, count + 1);
78}
79
80static int adf_pf2vf_blkmsg_get_data(struct adf_accel_vf_info *vf_info,
81 u8 type, u8 byte, u8 max_size, u8 *data,
82 pf2vf_blkmsg_data_getter_fn data_getter)
83{
84 u8 blkmsg[ADF_PFVF_BLKMSG_MSG_MAX_SIZE] = { 0 };
85 struct adf_accel_dev *accel_dev = vf_info->accel_dev;
86 adf_pf2vf_blkmsg_provider provider;
87 u8 msg_size;
88
89 provider = get_blkmsg_response_provider(type);
90
91 if (unlikely(!provider)) {
92 pr_err("QAT: No registered provider for message %d\n", type);
93 *data = ADF_PF2VF_INVALID_BLOCK_TYPE;
94 return -EINVAL;
95 }
96
97 if (unlikely((*provider)(accel_dev, blkmsg, vf_info->vf_compat_ver))) {
98 pr_err("QAT: unknown error from provider for message %d\n", type);
99 *data = ADF_PF2VF_UNSPECIFIED_ERROR;
100 return -EINVAL;
101 }
102
103 msg_size = ADF_PFVF_BLKMSG_HEADER_SIZE + blkmsg[ADF_PFVF_BLKMSG_LEN_BYTE];
104
105 if (unlikely(msg_size >= max_size)) {
106 pr_err("QAT: Invalid size %d provided for message type %d\n",
107 msg_size, type);
108 *data = ADF_PF2VF_PAYLOAD_TRUNCATED;
109 return -EINVAL;
110 }
111
112 if (unlikely(byte >= msg_size)) {
113 pr_err("QAT: Out-of-bound byte number %d (msg size %d)\n",
114 byte, msg_size);
115 *data = ADF_PF2VF_INVALID_BYTE_NUM_REQ;
116 return -EINVAL;
117 }
118
119 *data = data_getter(blkmsg, byte);
120 return 0;
121}
122
123static struct pfvf_message handle_blkmsg_req(struct adf_accel_vf_info *vf_info,
124 struct pfvf_message req)
125{
126 u8 resp_type = ADF_PF2VF_BLKMSG_RESP_TYPE_ERROR;
127 struct pfvf_message resp = { 0 };
128 u8 resp_data = 0;
129 u8 blk_type;
130 u8 blk_byte;
131 u8 byte_max;
132
133 switch (req.type) {
134 case ADF_VF2PF_MSGTYPE_LARGE_BLOCK_REQ:
135 blk_type = FIELD_GET(ADF_VF2PF_LARGE_BLOCK_TYPE_MASK, req.data)
136 + ADF_VF2PF_MEDIUM_BLOCK_TYPE_MAX + 1;
137 blk_byte = FIELD_GET(ADF_VF2PF_LARGE_BLOCK_BYTE_MASK, req.data);
138 byte_max = ADF_VF2PF_LARGE_BLOCK_BYTE_MAX;
139 break;
140 case ADF_VF2PF_MSGTYPE_MEDIUM_BLOCK_REQ:
141 blk_type = FIELD_GET(ADF_VF2PF_MEDIUM_BLOCK_TYPE_MASK, req.data)
142 + ADF_VF2PF_SMALL_BLOCK_TYPE_MAX + 1;
143 blk_byte = FIELD_GET(ADF_VF2PF_MEDIUM_BLOCK_BYTE_MASK, req.data);
144 byte_max = ADF_VF2PF_MEDIUM_BLOCK_BYTE_MAX;
145 break;
146 case ADF_VF2PF_MSGTYPE_SMALL_BLOCK_REQ:
147 blk_type = FIELD_GET(ADF_VF2PF_SMALL_BLOCK_TYPE_MASK, req.data);
148 blk_byte = FIELD_GET(ADF_VF2PF_SMALL_BLOCK_BYTE_MASK, req.data);
149 byte_max = ADF_VF2PF_SMALL_BLOCK_BYTE_MAX;
150 break;
151 }
152
153 /* Is this a request for CRC or data? */
154 if (FIELD_GET(ADF_VF2PF_BLOCK_CRC_REQ_MASK, req.data)) {
155 dev_dbg(&GET_DEV(vf_info->accel_dev),
156 "BlockMsg of type %d for CRC over %d bytes received from VF%d\n",
157 blk_type, blk_byte + 1, vf_info->vf_nr);
158
159 if (!adf_pf2vf_blkmsg_get_data(vf_info, blk_type, blk_byte,
160 byte_max, &resp_data,
161 adf_pf2vf_blkmsg_get_crc))
162 resp_type = ADF_PF2VF_BLKMSG_RESP_TYPE_CRC;
163 } else {
164 dev_dbg(&GET_DEV(vf_info->accel_dev),
165 "BlockMsg of type %d for data byte %d received from VF%d\n",
166 blk_type, blk_byte, vf_info->vf_nr);
167
168 if (!adf_pf2vf_blkmsg_get_data(vf_info, blk_type, blk_byte,
169 byte_max, &resp_data,
170 adf_pf2vf_blkmsg_get_byte))
171 resp_type = ADF_PF2VF_BLKMSG_RESP_TYPE_DATA;
172 }
173
174 resp.type = ADF_PF2VF_MSGTYPE_BLKMSG_RESP;
175 resp.data = FIELD_PREP(ADF_PF2VF_BLKMSG_RESP_TYPE_MASK, resp_type) |
176 FIELD_PREP(ADF_PF2VF_BLKMSG_RESP_DATA_MASK, resp_data);
177
178 return resp;
179}
180
181static struct pfvf_message handle_rp_reset_req(struct adf_accel_dev *accel_dev, u8 vf_nr,
182 struct pfvf_message req)
183{
184 struct adf_hw_device_data *hw_data = accel_dev->hw_device;
185 struct pfvf_message resp = {
186 .type = ADF_PF2VF_MSGTYPE_RP_RESET_RESP,
187 .data = RPRESET_SUCCESS
188 };
189 u32 bank_number;
190 u32 rsvd_field;
191
192 bank_number = FIELD_GET(ADF_VF2PF_RNG_RESET_RP_MASK, req.data);
193 rsvd_field = FIELD_GET(ADF_VF2PF_RNG_RESET_RSVD_MASK, req.data);
194
195 dev_dbg(&GET_DEV(accel_dev),
196 "Ring Pair Reset Message received from VF%d for bank 0x%x\n",
197 vf_nr, bank_number);
198
199 if (!hw_data->ring_pair_reset || rsvd_field) {
200 dev_dbg(&GET_DEV(accel_dev),
201 "Ring Pair Reset for VF%d is not supported\n", vf_nr);
202 resp.data = RPRESET_NOT_SUPPORTED;
203 goto out;
204 }
205
206 if (bank_number >= hw_data->num_banks_per_vf) {
207 dev_err(&GET_DEV(accel_dev),
208 "Invalid bank number (0x%x) from VF%d for Ring Reset\n",
209 bank_number, vf_nr);
210 resp.data = RPRESET_INVAL_BANK;
211 goto out;
212 }
213
214 /* Convert the VF provided value to PF bank number */
215 bank_number = vf_nr * hw_data->num_banks_per_vf + bank_number;
216 if (hw_data->ring_pair_reset(accel_dev, bank_number)) {
217 dev_dbg(&GET_DEV(accel_dev),
218 "Ring pair reset for VF%d failure\n", vf_nr);
219 resp.data = RPRESET_TIMEOUT;
220 goto out;
221 }
222
223 dev_dbg(&GET_DEV(accel_dev),
224 "Ring pair reset for VF%d successfully\n", vf_nr);
225
226out:
227 return resp;
228}
229
230static int adf_handle_vf2pf_msg(struct adf_accel_dev *accel_dev, u8 vf_nr,
231 struct pfvf_message msg, struct pfvf_message *resp)
232{
233 struct adf_accel_vf_info *vf_info = &accel_dev->pf.vf_info[vf_nr];
234
235 switch (msg.type) {
236 case ADF_VF2PF_MSGTYPE_COMPAT_VER_REQ:
237 {
238 u8 vf_compat_ver = msg.data;
239 u8 compat;
240
241 dev_dbg(&GET_DEV(accel_dev),
242 "VersionRequest received from VF%d (vers %d) to PF (vers %d)\n",
243 vf_nr, vf_compat_ver, ADF_PFVF_COMPAT_THIS_VERSION);
244
245 if (vf_compat_ver == 0)
246 compat = ADF_PF2VF_VF_INCOMPATIBLE;
247 else if (vf_compat_ver <= ADF_PFVF_COMPAT_THIS_VERSION)
248 compat = ADF_PF2VF_VF_COMPATIBLE;
249 else
250 compat = ADF_PF2VF_VF_COMPAT_UNKNOWN;
251
252 vf_info->vf_compat_ver = vf_compat_ver;
253
254 resp->type = ADF_PF2VF_MSGTYPE_VERSION_RESP;
255 resp->data = FIELD_PREP(ADF_PF2VF_VERSION_RESP_VERS_MASK,
256 ADF_PFVF_COMPAT_THIS_VERSION) |
257 FIELD_PREP(ADF_PF2VF_VERSION_RESP_RESULT_MASK, compat);
258 }
259 break;
260 case ADF_VF2PF_MSGTYPE_VERSION_REQ:
261 {
262 u8 compat;
263
264 dev_dbg(&GET_DEV(accel_dev),
265 "Legacy VersionRequest received from VF%d to PF (vers 1.1)\n",
266 vf_nr);
267
268 /* legacy driver, VF compat_ver is 0 */
269 vf_info->vf_compat_ver = 0;
270
271 /* PF always newer than legacy VF */
272 compat = ADF_PF2VF_VF_COMPATIBLE;
273
274 /* Set legacy major and minor version to the latest, 1.1 */
275 resp->type = ADF_PF2VF_MSGTYPE_VERSION_RESP;
276 resp->data = FIELD_PREP(ADF_PF2VF_VERSION_RESP_VERS_MASK, 0x11) |
277 FIELD_PREP(ADF_PF2VF_VERSION_RESP_RESULT_MASK, compat);
278 }
279 break;
280 case ADF_VF2PF_MSGTYPE_INIT:
281 {
282 dev_dbg(&GET_DEV(accel_dev),
283 "Init message received from VF%d\n", vf_nr);
284 vf_info->init = true;
285 }
286 break;
287 case ADF_VF2PF_MSGTYPE_SHUTDOWN:
288 {
289 dev_dbg(&GET_DEV(accel_dev),
290 "Shutdown message received from VF%d\n", vf_nr);
291 vf_info->init = false;
292 }
293 break;
294 case ADF_VF2PF_MSGTYPE_LARGE_BLOCK_REQ:
295 case ADF_VF2PF_MSGTYPE_MEDIUM_BLOCK_REQ:
296 case ADF_VF2PF_MSGTYPE_SMALL_BLOCK_REQ:
297 *resp = handle_blkmsg_req(vf_info, msg);
298 break;
299 case ADF_VF2PF_MSGTYPE_RP_RESET:
300 *resp = handle_rp_reset_req(accel_dev, vf_nr, msg);
301 break;
302 default:
303 dev_dbg(&GET_DEV(accel_dev),
304 "Unknown message from VF%d (type 0x%.4x, data: 0x%.4x)\n",
305 vf_nr, msg.type, msg.data);
306 return -ENOMSG;
307 }
308
309 return 0;
310}
311
312bool adf_recv_and_handle_vf2pf_msg(struct adf_accel_dev *accel_dev, u32 vf_nr)
313{
314 struct pfvf_message req;
315 struct pfvf_message resp = {0};
316
317 req = adf_recv_vf2pf_msg(accel_dev, vf_nr);
318 if (!req.type) /* Legacy or no message */
319 return true;
320
321 if (adf_handle_vf2pf_msg(accel_dev, vf_nr, req, &resp))
322 return false;
323
324 if (resp.type && adf_send_pf2vf_msg(accel_dev, vf_nr, resp))
325 dev_err(&GET_DEV(accel_dev),
326 "Failed to send response to VF%d\n", vf_nr);
327
328 return true;
329}
330
331/**
332 * adf_enable_pf2vf_comms() - Function enables communication from pf to vf
333 *
334 * @accel_dev: Pointer to acceleration device virtual function.
335 *
336 * This function carries out the necessary steps to setup and start the PFVF
337 * communication channel, if any.
338 *
339 * Return: 0 on success, error code otherwise.
340 */
341int adf_enable_pf2vf_comms(struct adf_accel_dev *accel_dev)
342{
343 adf_pfvf_crc_init();
344 spin_lock_init(&accel_dev->pf.vf2pf_ints_lock);
345
346 return 0;
347}
348EXPORT_SYMBOL_GPL(adf_enable_pf2vf_comms);