1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 2023 Advanced Micro Devices, Inc */
3
4 #include <linux/pci.h>
5
6 #include "core.h"
7 #include <linux/pds/pds_auxbus.h>
8
9 /**
10 * pds_client_register - Link the client to the firmware
11 * @pf: ptr to the PF driver's private data struct
12 * @devname: name that includes service into, e.g. pds_core.vDPA
13 *
14 * Return: positive client ID (ci) on success, or
15 * negative for error
16 */
pds_client_register(struct pdsc * pf,char * devname)17 int pds_client_register(struct pdsc *pf, char *devname)
18 {
19 union pds_core_adminq_comp comp = {};
20 union pds_core_adminq_cmd cmd = {};
21 int err;
22 u16 ci;
23
24 cmd.client_reg.opcode = PDS_AQ_CMD_CLIENT_REG;
25 strscpy(cmd.client_reg.devname, devname,
26 sizeof(cmd.client_reg.devname));
27
28 err = pdsc_adminq_post(pf, &cmd, &comp, false);
29 if (err) {
30 dev_info(pf->dev, "register dev_name %s with DSC failed, status %d: %pe\n",
31 devname, comp.status, ERR_PTR(err));
32 return err;
33 }
34
35 ci = le16_to_cpu(comp.client_reg.client_id);
36 if (!ci) {
37 dev_err(pf->dev, "%s: device returned null client_id\n",
38 __func__);
39 return -EIO;
40 }
41
42 dev_dbg(pf->dev, "%s: device returned client_id %d for %s\n",
43 __func__, ci, devname);
44
45 return ci;
46 }
47 EXPORT_SYMBOL_GPL(pds_client_register);
48
49 /**
50 * pds_client_unregister - Unlink the client from the firmware
51 * @pf: ptr to the PF driver's private data struct
52 * @client_id: id returned from pds_client_register()
53 *
54 * Return: 0 on success, or
55 * negative for error
56 */
pds_client_unregister(struct pdsc * pf,u16 client_id)57 int pds_client_unregister(struct pdsc *pf, u16 client_id)
58 {
59 union pds_core_adminq_comp comp = {};
60 union pds_core_adminq_cmd cmd = {};
61 int err;
62
63 cmd.client_unreg.opcode = PDS_AQ_CMD_CLIENT_UNREG;
64 cmd.client_unreg.client_id = cpu_to_le16(client_id);
65
66 err = pdsc_adminq_post(pf, &cmd, &comp, false);
67 if (err)
68 dev_info(pf->dev, "unregister client_id %d failed, status %d: %pe\n",
69 client_id, comp.status, ERR_PTR(err));
70
71 return err;
72 }
73 EXPORT_SYMBOL_GPL(pds_client_unregister);
74
75 /**
76 * pds_client_adminq_cmd - Process an adminq request for the client
77 * @padev: ptr to the client device
78 * @req: ptr to buffer with request
79 * @req_len: length of actual struct used for request
80 * @resp: ptr to buffer where answer is to be copied
81 * @flags: optional flags from pds_core_adminq_flags
82 *
83 * Return: 0 on success, or
84 * negative for error
85 *
86 * Client sends pointers to request and response buffers
87 * Core copies request data into pds_core_client_request_cmd
88 * Core sets other fields as needed
89 * Core posts to AdminQ
90 * Core copies completion data into response buffer
91 */
pds_client_adminq_cmd(struct pds_auxiliary_dev * padev,union pds_core_adminq_cmd * req,size_t req_len,union pds_core_adminq_comp * resp,u64 flags)92 int pds_client_adminq_cmd(struct pds_auxiliary_dev *padev,
93 union pds_core_adminq_cmd *req,
94 size_t req_len,
95 union pds_core_adminq_comp *resp,
96 u64 flags)
97 {
98 union pds_core_adminq_cmd cmd = {};
99 struct pci_dev *pf_pdev;
100 struct pdsc *pf;
101 size_t cp_len;
102 int err;
103
104 pf_pdev = pci_physfn(padev->vf_pdev);
105 pf = pci_get_drvdata(pf_pdev);
106
107 dev_dbg(pf->dev, "%s: %s opcode %d\n",
108 __func__, dev_name(&padev->aux_dev.dev), req->opcode);
109
110 if (pf->state)
111 return -ENXIO;
112
113 /* Wrap the client's request */
114 cmd.client_request.opcode = PDS_AQ_CMD_CLIENT_CMD;
115 cmd.client_request.client_id = cpu_to_le16(padev->client_id);
116 cp_len = min_t(size_t, req_len, sizeof(cmd.client_request.client_cmd));
117 memcpy(cmd.client_request.client_cmd, req, cp_len);
118
119 err = pdsc_adminq_post(pf, &cmd, resp,
120 !!(flags & PDS_AQ_FLAG_FASTPOLL));
121 if (err && err != -EAGAIN)
122 dev_info(pf->dev, "client admin cmd failed: %pe\n",
123 ERR_PTR(err));
124
125 return err;
126 }
127 EXPORT_SYMBOL_GPL(pds_client_adminq_cmd);
128
pdsc_auxbus_dev_release(struct device * dev)129 static void pdsc_auxbus_dev_release(struct device *dev)
130 {
131 struct pds_auxiliary_dev *padev =
132 container_of(dev, struct pds_auxiliary_dev, aux_dev.dev);
133
134 kfree(padev);
135 }
136
pdsc_auxbus_dev_register(struct pdsc * cf,struct pdsc * pf,u16 client_id,char * name)137 static struct pds_auxiliary_dev *pdsc_auxbus_dev_register(struct pdsc *cf,
138 struct pdsc *pf,
139 u16 client_id,
140 char *name)
141 {
142 struct auxiliary_device *aux_dev;
143 struct pds_auxiliary_dev *padev;
144 int err;
145
146 padev = kzalloc(sizeof(*padev), GFP_KERNEL);
147 if (!padev)
148 return ERR_PTR(-ENOMEM);
149
150 padev->vf_pdev = cf->pdev;
151 padev->client_id = client_id;
152
153 aux_dev = &padev->aux_dev;
154 aux_dev->name = name;
155 aux_dev->id = cf->uid;
156 aux_dev->dev.parent = cf->dev;
157 aux_dev->dev.release = pdsc_auxbus_dev_release;
158
159 err = auxiliary_device_init(aux_dev);
160 if (err < 0) {
161 dev_warn(cf->dev, "auxiliary_device_init of %s failed: %pe\n",
162 name, ERR_PTR(err));
163 kfree(padev);
164 return ERR_PTR(err);
165 }
166
167 err = auxiliary_device_add(aux_dev);
168 if (err) {
169 dev_warn(cf->dev, "auxiliary_device_add of %s failed: %pe\n",
170 name, ERR_PTR(err));
171 auxiliary_device_uninit(aux_dev);
172 return ERR_PTR(err);
173 }
174
175 return padev;
176 }
177
pdsc_auxbus_dev_del(struct pdsc * cf,struct pdsc * pf)178 int pdsc_auxbus_dev_del(struct pdsc *cf, struct pdsc *pf)
179 {
180 struct pds_auxiliary_dev *padev;
181 int err = 0;
182
183 mutex_lock(&pf->config_lock);
184
185 padev = pf->vfs[cf->vf_id].padev;
186 if (padev) {
187 pds_client_unregister(pf, padev->client_id);
188 auxiliary_device_delete(&padev->aux_dev);
189 auxiliary_device_uninit(&padev->aux_dev);
190 padev->client_id = 0;
191 }
192 pf->vfs[cf->vf_id].padev = NULL;
193
194 mutex_unlock(&pf->config_lock);
195 return err;
196 }
197
pdsc_auxbus_dev_add(struct pdsc * cf,struct pdsc * pf)198 int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf)
199 {
200 struct pds_auxiliary_dev *padev;
201 enum pds_core_vif_types vt;
202 char devname[PDS_DEVNAME_LEN];
203 u16 vt_support;
204 int client_id;
205 int err = 0;
206
207 mutex_lock(&pf->config_lock);
208
209 /* We only support vDPA so far, so it is the only one to
210 * be verified that it is available in the Core device and
211 * enabled in the devlink param. In the future this might
212 * become a loop for several VIF types.
213 */
214
215 /* Verify that the type is supported and enabled. It is not
216 * an error if there is no auxbus device support for this
217 * VF, it just means something else needs to happen with it.
218 */
219 vt = PDS_DEV_TYPE_VDPA;
220 vt_support = !!le16_to_cpu(pf->dev_ident.vif_types[vt]);
221 if (!(vt_support &&
222 pf->viftype_status[vt].supported &&
223 pf->viftype_status[vt].enabled))
224 goto out_unlock;
225
226 /* Need to register with FW and get the client_id before
227 * creating the aux device so that the aux client can run
228 * adminq commands as part its probe
229 */
230 snprintf(devname, sizeof(devname), "%s.%s.%d",
231 PDS_CORE_DRV_NAME, pf->viftype_status[vt].name, cf->uid);
232 client_id = pds_client_register(pf, devname);
233 if (client_id < 0) {
234 err = client_id;
235 goto out_unlock;
236 }
237
238 padev = pdsc_auxbus_dev_register(cf, pf, client_id,
239 pf->viftype_status[vt].name);
240 if (IS_ERR(padev)) {
241 pds_client_unregister(pf, client_id);
242 err = PTR_ERR(padev);
243 goto out_unlock;
244 }
245 pf->vfs[cf->vf_id].padev = padev;
246
247 out_unlock:
248 mutex_unlock(&pf->config_lock);
249 return err;
250 }
251