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 if (resp_data) 58 memcpy(resp_data, &mbx_resp->additional_info[0], resp_len); 59 60 hclgevf_reset_mbx_resp_status(hdev); 61 62 if (!(r_code0 == code0 && r_code1 == code1 && !mbx_resp->resp_status)) { 63 dev_err(&hdev->pdev->dev, 64 "VF could not match resp code(code0=%d,code1=%d), %d", 65 code0, code1, mbx_resp->resp_status); 66 return -EIO; 67 } 68 69 return 0; 70 } 71 72 int hclgevf_send_mbx_msg(struct hclgevf_dev *hdev, u16 code, u16 subcode, 73 const u8 *msg_data, u8 msg_len, bool need_resp, 74 u8 *resp_data, u16 resp_len) 75 { 76 struct hclge_mbx_vf_to_pf_cmd *req; 77 struct hclgevf_desc desc; 78 int status; 79 80 req = (struct hclge_mbx_vf_to_pf_cmd *)desc.data; 81 82 /* first two bytes are reserved for code & subcode */ 83 if (msg_len > (HCLGE_MBX_MAX_MSG_SIZE - 2)) { 84 dev_err(&hdev->pdev->dev, 85 "VF send mbx msg fail, msg len %d exceeds max len %d\n", 86 msg_len, HCLGE_MBX_MAX_MSG_SIZE); 87 return -EINVAL; 88 } 89 90 hclgevf_cmd_setup_basic_desc(&desc, HCLGEVF_OPC_MBX_VF_TO_PF, false); 91 req->msg[0] = code; 92 req->msg[1] = subcode; 93 memcpy(&req->msg[2], msg_data, msg_len); 94 95 /* synchronous send */ 96 if (need_resp) { 97 mutex_lock(&hdev->mbx_resp.mbx_mutex); 98 hclgevf_reset_mbx_resp_status(hdev); 99 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 100 if (status) { 101 dev_err(&hdev->pdev->dev, 102 "VF failed(=%d) to send mbx message to PF\n", 103 status); 104 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 105 return status; 106 } 107 108 status = hclgevf_get_mbx_resp(hdev, code, subcode, resp_data, 109 resp_len); 110 mutex_unlock(&hdev->mbx_resp.mbx_mutex); 111 } else { 112 /* asynchronous send */ 113 status = hclgevf_cmd_send(&hdev->hw, &desc, 1); 114 if (status) { 115 dev_err(&hdev->pdev->dev, 116 "VF failed(=%d) to send mbx message to PF\n", 117 status); 118 return status; 119 } 120 } 121 122 return status; 123 } 124 125 void hclgevf_mbx_handler(struct hclgevf_dev *hdev) 126 { 127 struct hclgevf_mbx_resp_status *resp; 128 struct hclge_mbx_pf_to_vf_cmd *req; 129 struct hclgevf_cmq_ring *crq; 130 struct hclgevf_desc *desc; 131 u16 link_status, flag; 132 u8 *temp; 133 int i; 134 135 resp = &hdev->mbx_resp; 136 crq = &hdev->hw.cmq.crq; 137 138 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag); 139 while (hnae_get_bit(flag, HCLGEVF_CMDQ_RX_OUTVLD_B)) { 140 desc = &crq->desc[crq->next_to_use]; 141 req = (struct hclge_mbx_pf_to_vf_cmd *)desc->data; 142 143 switch (req->msg[0]) { 144 case HCLGE_MBX_PF_VF_RESP: 145 if (resp->received_resp) 146 dev_warn(&hdev->pdev->dev, 147 "VF mbx resp flag not clear(%d)\n", 148 req->msg[1]); 149 resp->received_resp = true; 150 151 resp->origin_mbx_msg = (req->msg[1] << 16); 152 resp->origin_mbx_msg |= req->msg[2]; 153 resp->resp_status = req->msg[3]; 154 155 temp = (u8 *)&req->msg[4]; 156 for (i = 0; i < HCLGE_MBX_MAX_RESP_DATA_SIZE; i++) { 157 resp->additional_info[i] = *temp; 158 temp++; 159 } 160 break; 161 case HCLGE_MBX_LINK_STAT_CHANGE: 162 link_status = le16_to_cpu(req->msg[1]); 163 164 /* update upper layer with new link link status */ 165 hclgevf_update_link_status(hdev, link_status); 166 167 break; 168 default: 169 dev_err(&hdev->pdev->dev, 170 "VF received unsupported(%d) mbx msg from PF\n", 171 req->msg[0]); 172 break; 173 } 174 hclge_mbx_ring_ptr_move_crq(crq); 175 flag = le16_to_cpu(crq->desc[crq->next_to_use].flag); 176 } 177 178 /* Write back CMDQ_RQ header pointer, M7 need this pointer */ 179 hclgevf_write_dev(&hdev->hw, HCLGEVF_NIC_CRQ_HEAD_REG, 180 crq->next_to_use); 181 } 182