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 */ 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 */ 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 */ 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); 128 129 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 } 136 137 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 goto err_out; 164 } 165 166 err = auxiliary_device_add(aux_dev); 167 if (err) { 168 dev_warn(cf->dev, "auxiliary_device_add of %s failed: %pe\n", 169 name, ERR_PTR(err)); 170 goto err_out_uninit; 171 } 172 173 return padev; 174 175 err_out_uninit: 176 auxiliary_device_uninit(aux_dev); 177 err_out: 178 kfree(padev); 179 return ERR_PTR(err); 180 } 181 182 int pdsc_auxbus_dev_del(struct pdsc *cf, struct pdsc *pf) 183 { 184 struct pds_auxiliary_dev *padev; 185 int err = 0; 186 187 mutex_lock(&pf->config_lock); 188 189 padev = pf->vfs[cf->vf_id].padev; 190 if (padev) { 191 pds_client_unregister(pf, padev->client_id); 192 auxiliary_device_delete(&padev->aux_dev); 193 auxiliary_device_uninit(&padev->aux_dev); 194 padev->client_id = 0; 195 } 196 pf->vfs[cf->vf_id].padev = NULL; 197 198 mutex_unlock(&pf->config_lock); 199 return err; 200 } 201 202 int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf) 203 { 204 struct pds_auxiliary_dev *padev; 205 enum pds_core_vif_types vt; 206 char devname[PDS_DEVNAME_LEN]; 207 u16 vt_support; 208 int client_id; 209 int err = 0; 210 211 mutex_lock(&pf->config_lock); 212 213 /* We only support vDPA so far, so it is the only one to 214 * be verified that it is available in the Core device and 215 * enabled in the devlink param. In the future this might 216 * become a loop for several VIF types. 217 */ 218 219 /* Verify that the type is supported and enabled. It is not 220 * an error if there is no auxbus device support for this 221 * VF, it just means something else needs to happen with it. 222 */ 223 vt = PDS_DEV_TYPE_VDPA; 224 vt_support = !!le16_to_cpu(pf->dev_ident.vif_types[vt]); 225 if (!(vt_support && 226 pf->viftype_status[vt].supported && 227 pf->viftype_status[vt].enabled)) 228 goto out_unlock; 229 230 /* Need to register with FW and get the client_id before 231 * creating the aux device so that the aux client can run 232 * adminq commands as part its probe 233 */ 234 snprintf(devname, sizeof(devname), "%s.%s.%d", 235 PDS_CORE_DRV_NAME, pf->viftype_status[vt].name, cf->uid); 236 client_id = pds_client_register(pf, devname); 237 if (client_id < 0) { 238 err = client_id; 239 goto out_unlock; 240 } 241 242 padev = pdsc_auxbus_dev_register(cf, pf, client_id, 243 pf->viftype_status[vt].name); 244 if (IS_ERR(padev)) { 245 pds_client_unregister(pf, client_id); 246 err = PTR_ERR(padev); 247 goto out_unlock; 248 } 249 pf->vfs[cf->vf_id].padev = padev; 250 251 out_unlock: 252 mutex_unlock(&pf->config_lock); 253 return err; 254 } 255