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_USCOEND 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 udelay(HCLGEVF_SLEEP_USCOEND); 44 i++; 45 } 46 47 if (i >= HCLGEVF_MAX_TRY_TIMES) { 48 dev_err(&hdev->pdev->dev, 49 "VF could not get mbx resp(=%d) from PF in %d tries\n", 50 hdev->mbx_resp.received_resp, i); 51 return -EIO; 52 } 53 54 mbx_resp = &hdev->mbx_resp; 55 r_code0 = (u16)(mbx_resp->origin_mbx_msg >> 16); 56 r_code1 = (u16)(mbx_resp->origin_mbx_msg & 0xff); 57 58 if (mbx_resp->resp_status) 59 return mbx_resp->resp_status; 60 61 if (resp_data) 62 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len); 63 64 hclgevf_reset_mbx_resp_status(hdev); 65 66 if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) { 67 dev_err(&hdev->pdev->dev, 68 "VF could not match resp code(code0=%d,code1=%d), %d", 69 code0, code1, mbx_resp->resp_status); 70 return -EIO; 71 } 72 73 return 0; 74 } 75 76 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode, 77 const u8 *msg_data, u8 msg_len, bool need_resp, 78 u8 *resp_data, u16 resp_len) 79 { 80 struct hclge_mbx_vf_to_pf_cmd *req; 81 struct hclgevf_desc desc; 82 int status; 83 84 req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data; 85 86 /* first two bytes are reserved for code & subcode */ 87 if (msg_len > (HCLGE_MBX_MAX_MSG_SIZE - 2)) { 88 dev_err(&hdev->pdev->dev, 89 "VF send mbx msg fail, msg len %d exceeds max len %d\n", 90 msg_len, HCLGE_MBX_MAX_MSG_SIZE); 91 return -EINVAL; 92 } 93 94 hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false); 95 req->msg[0] = code; 96 req->msg[1] = subcode; 97 memcpy(&req->msg[2], msg_data, msg_len); 98 99 /* synchronous send */ 100 if (need_resp) { 101 mutex_lock(&hdev->mbx_resp.mbx_mutex); 102 hclgevf_reset_mbx_resp_status(hdev); 103 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 104 if (status) { 105 dev_err(&hdev->pdev->dev, 106 "VF failed(=%d) to send mbx message to PF\n", 107 status); 108 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 109 return status; 110 } 111 112 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data, 113 resp_len); 114 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 115 } else { 116 /* asynchronous send */ 117 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 118 if (status) { 119 dev_err(&hdev->pdev->dev, 120 "VF failed(=%d) to send mbx message to PF\n", 121 status); 122 return status; 123 } 124 } 125 126 return status; 127 } 128 129 static bool hclgevf_cmd_crq_empty(struct hclgevf_hw *hw) 130 { 131 u32 tail = hclgevf_read_dev(hw, HCLGEVF_NIC_CRQ_TAIL_REG); 132 133 return tail == hw->cmq.crq.next_to_use; 134 } 135 136 void hclgevf_mbx_handler(struct hclgevf_dev *hdev) 137 { 138 struct hclgevf_mbx_resp_status *resp; 139 struct hclge_mbx_pf_to_vf_cmd *req; 140 struct hclgevf_cmq_ring *crq; 141 struct hclgevf_desc *desc; 142 u16 *msg_q; 143 u16 flag; 144 u8 *temp; 145 int i; 146 147 resp = &hdev->mbx_resp; 148 crq = &hdev->hw.cmq.crq; 149 150 while (!hclgevf_cmd_crq_empty(&hdev->hw)) { 151 desc = &crq->desc[crq->next_to_use]; 152 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data; 153 154 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag); 155 if (unlikely(!hnae3_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B))) { 156 dev_warn(&hdev->pdev->dev, 157 "dropped invalid mailbox message, code = %d\n", 158 req->msg[0]); 159 160 /* dropping/not processing this invalid message */ 161 crq->desc[crq->next_to_use].flag = 0; 162 hclge_mbx_ring_ptr_move_crq(crq); 163 continue; 164 } 165 166 /* synchronous messages are time critical and need preferential 167 * treatment. Therefore, we need to acknowledge all the sync 168 * responses as quickly as possible so that waiting tasks do not 169 * timeout and simultaneously queue the async messages for later 170 * prcessing in context of mailbox task i.e. the slow path. 171 */ 172 switch (req->msg[0]) { 173 case HCLGE_MBX_PF_VF_RESP: 174 if (resp->received_resp) 175 dev_warn(&hdev->pdev->dev, 176 "VF mbx resp flag not clear(%d)\n", 177 req->msg[1]); 178 resp->received_resp = true; 179 180 resp->origin_mbx_msg = (req->msg[1] << 16); 181 resp->origin_mbx_msg |= req->msg[2]; 182 resp->resp_status = req->msg[3]; 183 184 temp = (u8 *)&req->msg[4]; 185 for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) { 186 resp->additional_info[i] = *temp; 187 temp++; 188 } 189 break; 190 case HCLGE_MBX_LINK_STAT_CHANGE: 191 case HCLGE_MBX_ASSERTING_RESET: 192 /* set this mbx event as pending. This is required as we 193 * might loose interrupt event when mbx task is busy 194 * handling. This shall be cleared when mbx task just 195 * enters handling state. 196 */ 197 hdev->mbx_event_pending = true; 198 199 /* we will drop the async msg if we find ARQ as full 200 * and continue with next message 201 */ 202 if (hdev->arq.count >= HCLGE_MBX_MAX_ARQ_MSG_NUM) { 203 dev_warn(&hdev->pdev->dev, 204 "Async Q full, dropping msg(%d)\n", 205 req->msg[1]); 206 break; 207 } 208 209 /* tail the async message in arq */ 210 msg_q = hdev->arq.msg_q[hdev->arq.tail]; 211 memcpy(&msg_q[0], req->msg, 212 HCLGE_MBX_MAX_ARQ_MSG_SIZE * sizeof(u16)); 213 hclge_mbx_tail_ptr_move_arq(hdev->arq); 214 hdev->arq.count++; 215 216 hclgevf_mbx_task_schedule(hdev); 217 218 break; 219 default: 220 dev_err(&hdev->pdev->dev, 221 "VF received unsupported(%d) mbx msg from PF\n", 222 req->msg[0]); 223 break; 224 } 225 crq->desc[crq->next_to_use].flag = 0; 226 hclge_mbx_ring_ptr_move_crq(crq); 227 } 228 229 /* Write back CMDQ_RQ header pointer, M7 need this pointer */ 230 hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG, 231 crq->next_to_use); 232 } 233 234 void hclgevf_mbx_async_handler(struct hclgevf_dev *hdev) 235 { 236 u16 link_status; 237 u16 *msg_q; 238 u8 duplex; 239 u32 speed; 240 u32 tail; 241 242 /* we can safely clear it now as we are at start of the async message 243 * processing 244 */ 245 hdev->mbx_event_pending = false; 246 247 tail = hdev->arq.tail; 248 249 /* process all the async queue messages */ 250 while (tail != hdev->arq.head) { 251 msg_q = hdev->arq.msg_q[hdev->arq.head]; 252 253 switch (msg_q[0]) { 254 case HCLGE_MBX_LINK_STAT_CHANGE: 255 link_status = le16_to_cpu(msg_q[1]); 256 memcpy(&speed, &msg_q[2], sizeof(speed)); 257 duplex = (u8)le16_to_cpu(msg_q[4]); 258 259 /* update upper layer with new link link status */ 260 hclgevf_update_link_status(hdev, link_status); 261 hclgevf_update_speed_duplex(hdev, speed, duplex); 262 263 break; 264 case HCLGE_MBX_ASSERTING_RESET: 265 /* PF has asserted reset hence VF should go in pending 266 * state and poll for the hardware reset status till it 267 * has been completely reset. After this stack should 268 * eventually be re-initialized. 269 */ 270 hdev->nic.reset_level = HNAE3_VF_RESET; 271 set_bit(HCLGEVF_RESET_PENDING, &hdev->reset_state); 272 hclgevf_reset_task_schedule(hdev); 273 274 break; 275 default: 276 dev_err(&hdev->pdev->dev, 277 "fetched unsupported(%d) message from arq\n", 278 msg_q[0]); 279 break; 280 } 281 282 hclge_mbx_head_ptr_move_arq(hdev->arq); 283 hdev->arq.count--; 284 msg_q = hdev->arq.msg_q[hdev->arq.head]; 285 } 286 } 287