1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2016 Cavium, Inc.
4 */
5
6 #include "cptvf.h"
7
cptvf_send_msg_to_pf(struct cpt_vf * cptvf,struct cpt_mbox * mbx)8 static void cptvf_send_msg_to_pf(struct cpt_vf *cptvf, struct cpt_mbox *mbx)
9 {
10 /* Writing mbox(1) causes interrupt */
11 cpt_write_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 0),
12 mbx->msg);
13 cpt_write_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 1),
14 mbx->data);
15 }
16
17 /* Interrupt handler to handle mailbox messages from VFs */
cptvf_handle_mbox_intr(struct cpt_vf * cptvf)18 void cptvf_handle_mbox_intr(struct cpt_vf *cptvf)
19 {
20 struct cpt_mbox mbx = {};
21
22 /*
23 * MBOX[0] contains msg
24 * MBOX[1] contains data
25 */
26 mbx.msg = cpt_read_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 0));
27 mbx.data = cpt_read_csr64(cptvf->reg_base, CPTX_VFX_PF_MBOXX(0, 0, 1));
28 dev_dbg(&cptvf->pdev->dev, "%s: Mailbox msg 0x%llx from PF\n",
29 __func__, mbx.msg);
30 switch (mbx.msg) {
31 case CPT_MSG_READY:
32 {
33 cptvf->pf_acked = true;
34 cptvf->vfid = mbx.data;
35 dev_dbg(&cptvf->pdev->dev, "Received VFID %d\n", cptvf->vfid);
36 break;
37 }
38 case CPT_MSG_QBIND_GRP:
39 cptvf->pf_acked = true;
40 cptvf->vftype = mbx.data;
41 dev_dbg(&cptvf->pdev->dev, "VF %d type %s group %d\n",
42 cptvf->vfid, ((mbx.data == SE_TYPES) ? "SE" : "AE"),
43 cptvf->vfgrp);
44 break;
45 case CPT_MBOX_MSG_TYPE_ACK:
46 cptvf->pf_acked = true;
47 break;
48 case CPT_MBOX_MSG_TYPE_NACK:
49 cptvf->pf_nacked = true;
50 break;
51 default:
52 dev_err(&cptvf->pdev->dev, "Invalid msg from PF, msg 0x%llx\n",
53 mbx.msg);
54 break;
55 }
56 }
57
cptvf_send_msg_to_pf_timeout(struct cpt_vf * cptvf,struct cpt_mbox * mbx)58 static int cptvf_send_msg_to_pf_timeout(struct cpt_vf *cptvf,
59 struct cpt_mbox *mbx)
60 {
61 int timeout = CPT_MBOX_MSG_TIMEOUT;
62 int sleep = 10;
63
64 cptvf->pf_acked = false;
65 cptvf->pf_nacked = false;
66 cptvf_send_msg_to_pf(cptvf, mbx);
67 /* Wait for previous message to be acked, timeout 2sec */
68 while (!cptvf->pf_acked) {
69 if (cptvf->pf_nacked)
70 return -EINVAL;
71 msleep(sleep);
72 if (cptvf->pf_acked)
73 break;
74 timeout -= sleep;
75 if (!timeout) {
76 dev_err(&cptvf->pdev->dev, "PF didn't ack to mbox msg %llx from VF%u\n",
77 (mbx->msg & 0xFF), cptvf->vfid);
78 return -EBUSY;
79 }
80 }
81
82 return 0;
83 }
84
85 /*
86 * Checks if VF is able to comminicate with PF
87 * and also gets the CPT number this VF is associated to.
88 */
cptvf_check_pf_ready(struct cpt_vf * cptvf)89 int cptvf_check_pf_ready(struct cpt_vf *cptvf)
90 {
91 struct pci_dev *pdev = cptvf->pdev;
92 struct cpt_mbox mbx = {};
93
94 mbx.msg = CPT_MSG_READY;
95 if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
96 dev_err(&pdev->dev, "PF didn't respond to READY msg\n");
97 return -EBUSY;
98 }
99
100 return 0;
101 }
102
103 /*
104 * Communicate VQs size to PF to program CPT(0)_PF_Q(0-15)_CTL of the VF.
105 * Must be ACKed.
106 */
cptvf_send_vq_size_msg(struct cpt_vf * cptvf)107 int cptvf_send_vq_size_msg(struct cpt_vf *cptvf)
108 {
109 struct pci_dev *pdev = cptvf->pdev;
110 struct cpt_mbox mbx = {};
111
112 mbx.msg = CPT_MSG_QLEN;
113 mbx.data = cptvf->qsize;
114 if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
115 dev_err(&pdev->dev, "PF didn't respond to vq_size msg\n");
116 return -EBUSY;
117 }
118
119 return 0;
120 }
121
122 /*
123 * Communicate VF group required to PF and get the VQ binded to that group
124 */
cptvf_send_vf_to_grp_msg(struct cpt_vf * cptvf)125 int cptvf_send_vf_to_grp_msg(struct cpt_vf *cptvf)
126 {
127 struct pci_dev *pdev = cptvf->pdev;
128 struct cpt_mbox mbx = {};
129
130 mbx.msg = CPT_MSG_QBIND_GRP;
131 /* Convey group of the VF */
132 mbx.data = cptvf->vfgrp;
133 if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
134 dev_err(&pdev->dev, "PF didn't respond to vf_type msg\n");
135 return -EBUSY;
136 }
137
138 return 0;
139 }
140
141 /*
142 * Communicate VF group required to PF and get the VQ binded to that group
143 */
cptvf_send_vf_priority_msg(struct cpt_vf * cptvf)144 int cptvf_send_vf_priority_msg(struct cpt_vf *cptvf)
145 {
146 struct pci_dev *pdev = cptvf->pdev;
147 struct cpt_mbox mbx = {};
148
149 mbx.msg = CPT_MSG_VQ_PRIORITY;
150 /* Convey group of the VF */
151 mbx.data = cptvf->priority;
152 if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
153 dev_err(&pdev->dev, "PF didn't respond to vf_type msg\n");
154 return -EBUSY;
155 }
156 return 0;
157 }
158
159 /*
160 * Communicate to PF that VF is UP and running
161 */
cptvf_send_vf_up(struct cpt_vf * cptvf)162 int cptvf_send_vf_up(struct cpt_vf *cptvf)
163 {
164 struct pci_dev *pdev = cptvf->pdev;
165 struct cpt_mbox mbx = {};
166
167 mbx.msg = CPT_MSG_VF_UP;
168 if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
169 dev_err(&pdev->dev, "PF didn't respond to UP msg\n");
170 return -EBUSY;
171 }
172
173 return 0;
174 }
175
176 /*
177 * Communicate to PF that VF is DOWN and running
178 */
cptvf_send_vf_down(struct cpt_vf * cptvf)179 int cptvf_send_vf_down(struct cpt_vf *cptvf)
180 {
181 struct pci_dev *pdev = cptvf->pdev;
182 struct cpt_mbox mbx = {};
183
184 mbx.msg = CPT_MSG_VF_DOWN;
185 if (cptvf_send_msg_to_pf_timeout(cptvf, &mbx)) {
186 dev_err(&pdev->dev, "PF didn't respond to DOWN msg\n");
187 return -EBUSY;
188 }
189
190 return 0;
191 }
192