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ipmi: Add an opal interface to the ipmi stack
This patch adds two opal calls (opal_ipmi_send and opal_ipmi_recv) to allow an operating system to send and receive arbitrary ipmi messages to the BMC. Signed-off-by: Alistair Popple <alistair@popple.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,5 +1,5 @@ | ||
| SUBDIRS += hw/ipmi | ||
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| IPMI_OBJS = ipmi-rtc.o ipmi-power.o | ||
| IPMI_OBJS = ipmi-rtc.o ipmi-power.o ipmi-opal.o | ||
| IPMI = hw/ipmi/built-in.o | ||
| $(IPMI): $(IPMI_OBJS:%=hw/ipmi/%) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| /* Copyright 2013-2014 IBM Corp. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or | ||
| * implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| #include <stdlib.h> | ||
| #include <ipmi.h> | ||
| #include <lock.h> | ||
| #include <opal.h> | ||
| #include <device.h> | ||
| #include <ccan/list/list.h> | ||
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| enum { | ||
| OPAL_IPMI_MSG_FORMAT_VERSION_1 = 1, | ||
| }; | ||
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| struct opal_ipmi_msg { | ||
| uint8_t version; | ||
| uint8_t netfn; | ||
| uint8_t cmd; | ||
| uint8_t data[]; | ||
| }; | ||
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| static struct lock msgq_lock = LOCK_UNLOCKED; | ||
| static struct list_head msgq = LIST_HEAD_INIT(msgq); | ||
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| static void opal_send_complete(struct ipmi_msg *msg) | ||
| { | ||
| lock(&msgq_lock); | ||
| list_add_tail(&msgq, &msg->link); | ||
| opal_update_pending_evt(ipmi_backend->opal_event_ipmi_recv, | ||
| ipmi_backend->opal_event_ipmi_recv); | ||
| unlock(&msgq_lock); | ||
| } | ||
|
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| static int64_t opal_ipmi_send(uint64_t interface, | ||
| struct opal_ipmi_msg *opal_ipmi_msg, uint64_t msg_len) | ||
| { | ||
| struct ipmi_msg *msg; | ||
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| if (opal_ipmi_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) { | ||
| prerror("OPAL IPMI: Incorrect version\n"); | ||
| return OPAL_UNSUPPORTED; | ||
| } | ||
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| msg_len -= sizeof(struct opal_ipmi_msg); | ||
| if (msg_len > IPMI_MAX_REQ_SIZE) { | ||
| prerror("OPAL IPMI: Invalid request length\n"); | ||
| return OPAL_PARAMETER; | ||
| } | ||
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| prlog(PR_DEBUG, "opal_ipmi_send(cmd: 0x%02x netfn: 0x%02x len: 0x%02llx)\n", | ||
| opal_ipmi_msg->cmd, opal_ipmi_msg->netfn >> 2, msg_len); | ||
|
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| msg = ipmi_mkmsg(interface, | ||
| IPMI_CODE(opal_ipmi_msg->netfn >> 2, opal_ipmi_msg->cmd), | ||
| opal_send_complete, NULL, opal_ipmi_msg->data, | ||
| msg_len, IPMI_MAX_RESP_SIZE); | ||
| if (!msg) | ||
| return OPAL_RESOURCE; | ||
|
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| msg->complete = opal_send_complete; | ||
| msg->error = opal_send_complete; | ||
| return ipmi_queue_msg(msg); | ||
| } | ||
|
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| static int64_t opal_ipmi_recv(uint64_t interface, | ||
| struct opal_ipmi_msg *opal_ipmi_msg, uint64_t *msg_len) | ||
| { | ||
| struct ipmi_msg *msg; | ||
| int64_t rc; | ||
|
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| lock(&msgq_lock); | ||
| msg = list_top(&msgq, struct ipmi_msg, link); | ||
|
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| if (!msg) { | ||
| rc = OPAL_EMPTY; | ||
| goto out_unlock; | ||
| } | ||
|
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| if (opal_ipmi_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) { | ||
| prerror("OPAL IPMI: Incorrect version\n"); | ||
| rc = OPAL_UNSUPPORTED; | ||
| goto out_unlock; | ||
| } | ||
|
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| if (interface != IPMI_DEFAULT_INTERFACE) { | ||
| prerror("IPMI: Invalid interface 0x%llx in opal_ipmi_recv\n", interface); | ||
| rc = OPAL_EMPTY; | ||
| goto out_unlock; | ||
| } | ||
|
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| if (*msg_len - sizeof(struct opal_ipmi_msg) < msg->resp_size + 1) { | ||
| rc = OPAL_RESOURCE; | ||
| goto out_unlock; | ||
| } | ||
|
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| list_del(&msg->link); | ||
| if (list_empty(&msgq)) | ||
| opal_update_pending_evt(ipmi_backend->opal_event_ipmi_recv, 0); | ||
| unlock(&msgq_lock); | ||
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| opal_ipmi_msg->cmd = msg->cmd; | ||
| opal_ipmi_msg->netfn = msg->netfn; | ||
| opal_ipmi_msg->data[0] = msg->cc; | ||
| memcpy(&opal_ipmi_msg->data[1], msg->data, msg->resp_size); | ||
|
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| prlog(PR_DEBUG, "opal_ipmi_recv(cmd: 0x%02x netfn: 0x%02x resp_size: 0x%02x)\n", | ||
| msg->cmd, msg->netfn >> 2, msg->resp_size); | ||
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| /* Add one as the completion code is returned in the message data */ | ||
| *msg_len = msg->resp_size + sizeof(struct opal_ipmi_msg) + 1; | ||
| ipmi_free_msg(msg); | ||
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| return OPAL_SUCCESS; | ||
|
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| out_unlock: | ||
| unlock(&msgq_lock); | ||
| return rc; | ||
| } | ||
|
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| void ipmi_opal_init(void) | ||
| { | ||
| struct dt_node *opal_ipmi; | ||
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| opal_ipmi = dt_new(opal_node, "ipmi"); | ||
| dt_add_property_strings(opal_ipmi, "compatible", "ibm,opal-ipmi"); | ||
| dt_add_property_cells(opal_ipmi, "ibm,ipmi-interface-id", | ||
| IPMI_DEFAULT_INTERFACE); | ||
| dt_add_property_cells(opal_ipmi, "interrupts", | ||
| ilog2(ipmi_backend->opal_event_ipmi_recv)); | ||
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| opal_register(OPAL_IPMI_SEND, opal_ipmi_send, 3); | ||
| opal_register(OPAL_IPMI_RECV, opal_ipmi_recv, 3); | ||
| } |
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