2 * PowerNV OPAL IPMI driver
4 * Copyright 2014 IBM Corp.
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
12 #define pr_fmt(fmt) "ipmi-powernv: " fmt
14 #include <linux/ipmi_smi.h>
15 #include <linux/list.h>
16 #include <linux/module.h>
22 struct ipmi_smi_powernv {
24 struct ipmi_device_id ipmi_id;
27 struct notifier_block event_nb;
30 * We assume that there can only be one outstanding request, so
31 * keep the pending message in cur_msg. We protect this from concurrent
32 * updates through send & recv calls, (and consequently opal_msg, which
33 * is in-use when cur_msg is set) with msg_lock
36 struct ipmi_smi_msg *cur_msg;
37 struct opal_ipmi_msg *opal_msg;
40 static int ipmi_powernv_start_processing(void *send_info, ipmi_smi_t intf)
42 struct ipmi_smi_powernv *smi = send_info;
48 static void send_error_reply(struct ipmi_smi_powernv *smi,
49 struct ipmi_smi_msg *msg, u8 completion_code)
51 msg->rsp[0] = msg->data[0] | 0x4;
52 msg->rsp[1] = msg->data[1];
53 msg->rsp[2] = completion_code;
55 ipmi_smi_msg_received(smi->intf, msg);
58 static void ipmi_powernv_send(void *send_info, struct ipmi_smi_msg *msg)
60 struct ipmi_smi_powernv *smi = send_info;
61 struct opal_ipmi_msg *opal_msg;
66 /* ensure data_len will fit in the opal_ipmi_msg buffer... */
67 if (msg->data_size > IPMI_MAX_MSG_LENGTH) {
68 comp = IPMI_REQ_LEN_EXCEEDED_ERR;
72 /* ... and that we at least have netfn and cmd bytes */
73 if (msg->data_size < 2) {
74 comp = IPMI_REQ_LEN_INVALID_ERR;
78 spin_lock_irqsave(&smi->msg_lock, flags);
81 comp = IPMI_NODE_BUSY_ERR;
85 /* format our data for the OPAL API */
86 opal_msg = smi->opal_msg;
87 opal_msg->version = OPAL_IPMI_MSG_FORMAT_VERSION_1;
88 opal_msg->netfn = msg->data[0];
89 opal_msg->cmd = msg->data[1];
90 if (msg->data_size > 2)
91 memcpy(opal_msg->data, msg->data + 2, msg->data_size - 2);
93 /* data_size already includes the netfn and cmd bytes */
94 size = sizeof(*opal_msg) + msg->data_size - 2;
96 pr_devel("%s: opal_ipmi_send(0x%llx, %p, %ld)\n", __func__,
97 smi->interface_id, opal_msg, size);
98 rc = opal_ipmi_send(smi->interface_id, opal_msg, size);
99 pr_devel("%s: -> %d\n", __func__, rc);
103 spin_unlock_irqrestore(&smi->msg_lock, flags);
107 comp = IPMI_ERR_UNSPECIFIED;
109 spin_unlock_irqrestore(&smi->msg_lock, flags);
111 send_error_reply(smi, msg, comp);
114 static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi)
116 struct opal_ipmi_msg *opal_msg;
117 struct ipmi_smi_msg *msg;
122 pr_devel("%s: opal_ipmi_recv(%llx, msg, sz)\n", __func__,
125 spin_lock_irqsave(&smi->msg_lock, flags);
128 spin_unlock_irqrestore(&smi->msg_lock, flags);
129 pr_warn("no current message?\n");
134 opal_msg = smi->opal_msg;
136 size = cpu_to_be64(sizeof(*opal_msg) + IPMI_MAX_MSG_LENGTH);
138 rc = opal_ipmi_recv(smi->interface_id,
141 size = be64_to_cpu(size);
142 pr_devel("%s: -> %d (size %lld)\n", __func__,
143 rc, rc == 0 ? size : 0);
145 spin_unlock_irqrestore(&smi->msg_lock, flags);
146 ipmi_free_smi_msg(msg);
150 if (size < sizeof(*opal_msg)) {
151 spin_unlock_irqrestore(&smi->msg_lock, flags);
152 pr_warn("unexpected IPMI message size %lld\n", size);
156 if (opal_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) {
157 spin_unlock_irqrestore(&smi->msg_lock, flags);
158 pr_warn("unexpected IPMI message format (version %d)\n",
163 msg->rsp[0] = opal_msg->netfn;
164 msg->rsp[1] = opal_msg->cmd;
165 if (size > sizeof(*opal_msg))
166 memcpy(&msg->rsp[2], opal_msg->data, size - sizeof(*opal_msg));
167 msg->rsp_size = 2 + size - sizeof(*opal_msg);
170 spin_unlock_irqrestore(&smi->msg_lock, flags);
171 ipmi_smi_msg_received(smi->intf, msg);
175 static void ipmi_powernv_request_events(void *send_info)
179 static void ipmi_powernv_set_run_to_completion(void *send_info,
180 bool run_to_completion)
184 static void ipmi_powernv_poll(void *send_info)
186 struct ipmi_smi_powernv *smi = send_info;
188 ipmi_powernv_recv(smi);
191 static struct ipmi_smi_handlers ipmi_powernv_smi_handlers = {
192 .owner = THIS_MODULE,
193 .start_processing = ipmi_powernv_start_processing,
194 .sender = ipmi_powernv_send,
195 .request_events = ipmi_powernv_request_events,
196 .set_run_to_completion = ipmi_powernv_set_run_to_completion,
197 .poll = ipmi_powernv_poll,
200 static int ipmi_opal_event(struct notifier_block *nb,
201 unsigned long events, void *change)
203 struct ipmi_smi_powernv *smi = container_of(nb,
204 struct ipmi_smi_powernv, event_nb);
206 if (events & smi->event)
207 ipmi_powernv_recv(smi);
211 static int ipmi_powernv_probe(struct platform_device *pdev)
213 struct ipmi_smi_powernv *ipmi;
218 if (!pdev || !pdev->dev.of_node)
223 ipmi = devm_kzalloc(dev, sizeof(*ipmi), GFP_KERNEL);
227 spin_lock_init(&ipmi->msg_lock);
229 rc = of_property_read_u32(dev->of_node, "ibm,ipmi-interface-id",
232 dev_warn(dev, "No interface ID property\n");
235 ipmi->interface_id = prop;
237 rc = of_property_read_u32(dev->of_node, "interrupts", &prop);
239 dev_warn(dev, "No interrupts property\n");
243 ipmi->event = 1ull << prop;
244 ipmi->event_nb.notifier_call = ipmi_opal_event;
246 rc = opal_notifier_register(&ipmi->event_nb);
248 dev_warn(dev, "OPAL notifier registration failed (%d)\n", rc);
252 ipmi->opal_msg = devm_kmalloc(dev,
253 sizeof(*ipmi->opal_msg) + IPMI_MAX_MSG_LENGTH,
255 if (!ipmi->opal_msg) {
260 /* todo: query actual ipmi_device_id */
261 rc = ipmi_register_smi(&ipmi_powernv_smi_handlers, ipmi,
262 &ipmi->ipmi_id, dev, 0);
264 dev_warn(dev, "IPMI SMI registration failed (%d)\n", rc);
268 dev_set_drvdata(dev, ipmi);
272 devm_kfree(dev, ipmi->opal_msg);
274 opal_notifier_unregister(&ipmi->event_nb);
276 devm_kfree(dev, ipmi);
280 static int ipmi_powernv_remove(struct platform_device *pdev)
282 struct ipmi_smi_powernv *smi = dev_get_drvdata(&pdev->dev);
284 ipmi_unregister_smi(smi->intf);
285 opal_notifier_unregister(&smi->event_nb);
289 static const struct of_device_id ipmi_powernv_match[] = {
290 { .compatible = "ibm,opal-ipmi" },
295 static struct platform_driver powernv_ipmi_driver = {
297 .name = "ipmi-powernv",
298 .owner = THIS_MODULE,
299 .of_match_table = ipmi_powernv_match,
301 .probe = ipmi_powernv_probe,
302 .remove = ipmi_powernv_remove,
306 module_platform_driver(powernv_ipmi_driver);
308 MODULE_DEVICE_TABLE(of, ipmi_powernv_match);
309 MODULE_DESCRIPTION("powernv IPMI driver");
310 MODULE_AUTHOR("Jeremy Kerr <jk@ozlabs.org>");
311 MODULE_LICENSE("GPL");