1 // SPDX-License-Identifier: GPL-2.0+ 2 // Copyright (c) 2016-2017 Hisilicon Limited. 3 4 #include "hclge_mbx.h" 5 #include "hclgevf_main.h" 6 #include "hnae3.h" 7 8 static void hclgevf_reset_mbx_resp_status(struct hclgevf_dev *hdev) 9 { 10 /* this function should be called with mbx_resp.mbx_mutex held 11 * to prtect the received_response from race condition 12 */ 13 hdev->mbx_resp.received_resp = false; 14 hdev->mbx_resp.origin_mbx_msg = 0; 15 hdev->mbx_resp.resp_status = 0; 16 memset(hdev->mbx_resp.additional_info, 0, HCLGE_MBX_MAX_RESP_DATA_SIZE); 17 } 18 19 /* hclgevf_get_mbx_resp: used to get a response from PF after VF sends a mailbox 20 * message to PF. 21 * @hdev: pointer to struct hclgevf_dev 22 * @resp_msg: pointer to store the original message type and response status 23 * @len: the resp_msg data array length. 24 */ 25 static int hclgevf_get_mbx_resp(struct hclgevf_dev *hdev, u16 code0, u16 code1, 26 u8 *resp_data, u16 resp_len) 27 { 28 #define HCLGEVF_MAX_TRY_TIMES 500 29 #define HCLGEVF_SLEEP_USECOND 1000 30 struct hclgevf_mbx_resp_status *mbx_resp; 31 u16 r_code0, r_code1; 32 int i = 0; 33 34 if (resp_len > HCLGE_MBX_MAX_RESP_DATA_SIZE) { 35 dev_err(&hdev->pdev->dev, 36 "VF mbx response len(=%d) exceeds maximum(=%d)\n", 37 resp_len, 38 HCLGE_MBX_MAX_RESP_DATA_SIZE); 39 return -EINVAL; 40 } 41 42 while ((!hdev->mbx_resp.received_resp) && (i < HCLGEVF_MAX_TRY_TIMES)) { 43 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) 44 return -EIO; 45 46 usleep_range(HCLGEVF_SLEEP_USECOND, HCLGEVF_SLEEP_USECOND * 2); 47 i++; 48 } 49 50 if (i >= HCLGEVF_MAX_TRY_TIMES) { 51 dev_err(&hdev->pdev->dev, 52 "VF could not get mbx resp(=%d) from PF in %d tries\n", 53 hdev->mbx_resp.received_resp, i); 54 return -EIO; 55 } 56 57 mbx_resp = &hdev->mbx_resp; 58 r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16); 59 r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff); 60 61 if (mbx_resp->resp_status) 62 return mbx_resp->resp_status; 63 64 if (resp_data) 65 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len); 66 67 hclgevf_reset_mbx_resp_status(hdev); 68 69 if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) { 70 dev_err(&hdev->pdev->dev, 71 "VF could not match resp code(code0=%d,code1=%d), %d", 72 code0, code1, mbx_resp->resp_status); 73 return -EIO; 74 } 75 76 return 0; 77 } 78 79 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode, 80 const u8 *msg_data, u8 msg_len, bool need_resp, 81 u8 *resp_data, u16 resp_len) 82 { 83 struct hclge_mbx_vf_to_pf_cmd *req; 84 struct hclgevf_desc desc; 85 int status; 86 87 req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data; 88 89 /* first two bytes are reserved for code & subcode */ 90 if (msg_len > (HCLGE_MBX_MAX_MSG_SIZE - 2)) { 91 dev_err(&hdev->pdev->dev, 92 "VF send mbx msg fail, msg len %d exceeds max len %d\n", 93 msg_len, HCLGE_MBX_MAX_MSG_SIZE); 94 return -EINVAL; 95 } 96 97 hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false); 98 req->msg[0] = code; 99 req->msg[1] = subcode; 100 memcpy(&req->msg[2], msg_data, msg_len); 101 102 /* synchronous send */ 103 if (need_resp) { 104 mutex_lock(&hdev->mbx_resp.mbx_mutex); 105 hclgevf_reset_mbx_resp_status(hdev); 106 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 107 if (status) { 108 dev_err(&hdev->pdev->dev, 109 "VF failed(=%d) to send mbx message to PF\n", 110 status); 111 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 112 return status; 113 } 114 115 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data, 116 resp_len); 117 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 118 } else { 119 /* asynchronous send */ 120 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 121 if (status) { 122 dev_err(&hdev->pdev->dev, 123 "VF failed(=%d) to send mbx message to PF\n", 124 status); 125 return status; 126 } 127 } 128 129 return status; 130 } 131 132 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw) 133 { 134 u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG); 135 136 return tail == hw->cmq.crq.next_to_use; 137 } 138 139 void hclgevf_mbx_handler(struct hclgevf_dev *hdev) 140 { 141 struct hclgevf_mbx_resp_status *resp; 142 struct hclge_mbx_pf_to_vf_cmd *req; 143 struct hclgevf_cmq_ring *crq; 144 struct hclgevf_desc *desc; 145 u16 *msg_q; 146 u16 flag; 147 u8 *temp; 148 int i; 149 150 resp = &hdev->mbx_resp; 151 crq = &hdev->hw.cmq.crq; 152 153 while (!hclgevf_cmd_crq_empty(&hdev->hw)) { 154 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 155 dev_info(&hdev->pdev->dev, "vf crq need init\n"); 156 return; 157 } 158 159 desc = &crq->desc[crq->next_to_use]; 160 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data; 161 162 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag); 163 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) { 164 dev_warn(&hdev->pdev->dev, 165 "dropped invalid mailbox message, code = %d\n", 166 req->msg[0]); 167 168 /* dropping/not processing this invalid message */ 169 crq->desc[crq->next_to_use].flag = 0; 170 hclge_mbx_ring_ptr_move_crq(crq); 171 continue; 172 } 173 174 /* synchronous messages are time critical and need preferential 175 * treatment. Therefore, we need to acknowledge all the sync 176 * responses as quickly as possible so that waiting tasks do not 177 * timeout and simultaneously queue the async messages for later 178 * prcessing in context of mailbox task i.e. the slow path. 179 */ 180 switch (req->msg[0]) { 181 case HCLGE_MBX_PF_VF_RESP: 182 if (resp->received_resp) 183 dev_warn(&hdev->pdev->dev, 184 "VF mbx resp flag not clear(%d)\n", 185 req->msg[1]); 186 resp->received_resp = true; 187 188 resp->origin_mbx_msg = (req->msg[1] << 16); 189 resp->origin_mbx_msg |= req->msg[2]; 190 resp->resp_status = req->msg[3]; 191 192 temp = (u8 *)&req->msg[4]; 193 for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) { 194 resp->additional_info[i] = *temp; 195 temp++; 196 } 197 break; 198 case HCLGE_MBX_LINK_STAT_CHANGE: 199 case HCLGE_MBX_ASSERTING_RESET: 200 /* set this mbx event as pending. This is required as we 201 * might loose interrupt event when mbx task is busy 202 * handling. This shall be cleared when mbx task just 203 * enters handling state. 204 */ 205 hdev->mbx_event_pending = true; 206 207 /* we will drop the async msg if we find ARQ as full 208 * and continue with next message 209 */ 210 if (hdev->arq.count >= HCLGE_MBX_MAX_ARQ_MSG_NUM) { 211 dev_warn(&hdev->pdev->dev, 212 "Async Q full, dropping msg(%d)\n", 213 req->msg[1]); 214 break; 215 } 216 217 /* tail the async message in arq */ 218 msg_q = hdev->arq.msg_q[hdev->arq.tail]; 219 memcpy(&msg_q[0], req->msg, 220 HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16)); 221 hclge_mbx_tail_ptr_move_arq(hdev->arq); 222 hdev->arq.count++; 223 224 hclgevf_mbx_task_schedule(hdev); 225 226 break; 227 default: 228 dev_err(&hdev->pdev->dev, 229 "VF received unsupported(%d) mbx msg from PF\n", 230 req->msg[0]); 231 break; 232 } 233 crq->desc[crq->next_to_use].flag = 0; 234 hclge_mbx_ring_ptr_move_crq(crq); 235 } 236 237 /* Write back CMDQ_RQ header pointer, M7 need this pointer */ 238 hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG, 239 crq->next_to_use); 240 } 241 242 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev) 243 { 244 enum hnae3_reset_type reset_type; 245 u16 link_status; 246 u16 *msg_q; 247 u8 duplex; 248 u32 speed; 249 u32 tail; 250 251 /* we can safely clear it now as we are at start of the async message 252 * processing 253 */ 254 hdev->mbx_event_pending = false; 255 256 tail = hdev->arq.tail; 257 258 /* process all the async queue messages */ 259 while (tail != hdev->arq.head) { 260 if (test_bit(HCLGEVF_STATE_CMD_DISABLE, &hdev->state)) { 261 dev_info(&hdev->pdev->dev, 262 "vf crq need init in async\n"); 263 return; 264 } 265 266 msg_q = hdev->arq.msg_q[hdev->arq.head]; 267 268 switch (msg_q[0]) { 269 case HCLGE_MBX_LINK_STAT_CHANGE: 270 link_status = le16_to_cpu(msg_q[1]); 271 memcpy(&speed, &msg_q[2], sizeof(speed)); 272 duplex = (u8)le16_to_cpu(msg_q[4]); 273 274 /* update upper layer with new link link status */ 275 hclgevf_update_link_status(hdev, link_status); 276 hclgevf_update_speed_duplex(hdev, speed, duplex); 277 278 break; 279 case HCLGE_MBX_ASSERTING_RESET: 280 /* PF has asserted reset hence VF should go in pending 281 * state and poll for the hardware reset status till it 282 * has been completely reset. After this stack should 283 * eventually be re-initialized. 284 */ 285 reset_type = le16_to_cpu(msg_q[1]); 286 set_bit(reset_type, &hdev->reset_pending); 287 set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state); 288 hclgevf_reset_task_schedule(hdev); 289 290 break; 291 default: 292 dev_err(&hdev->pdev->dev, 293 "fetched unsupported(%d) message from arq\n", 294 msg_q[0]); 295 break; 296 } 297 298 hclge_mbx_head_ptr_move_arq(hdev->arq); 299 hdev->arq.count--; 300 msg_q = hdev->arq.msg_q[hdev->arq.head]; 301 } 302 } 303