drivers/char/ipmi: Add powernv IPMI driver
This change adds an initial IPMI driver for powerpc OPAL firmware. The interface is exposed entirely through firmware: we have two functions to send and receive IPMI messages, and an interrupt notification from the firmware to signify that a message is available. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Jeremy Kerr
Corey Minyard
Родитель
259307074b
Коммит
6a11e5c67a
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@ -70,6 +70,12 @@ config IPMI_SSIF
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have a driver that must be accessed over an I2C bus instead of a
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standard interface. This module requires I2C support.
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config IPMI_POWERNV
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depends on PPC_POWERNV
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tristate 'POWERNV (OPAL firmware) IPMI interface'
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help
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Provides a driver for OPAL firmware-based IPMI interfaces.
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config IPMI_WATCHDOG
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tristate 'IPMI Watchdog Timer'
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help
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@ -8,5 +8,6 @@ obj-$(CONFIG_IPMI_HANDLER) += ipmi_msghandler.o
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obj-$(CONFIG_IPMI_DEVICE_INTERFACE) += ipmi_devintf.o
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obj-$(CONFIG_IPMI_SI) += ipmi_si.o
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obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o
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obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o
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obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o
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obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o
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@ -0,0 +1,310 @@
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/*
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* PowerNV OPAL IPMI driver
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*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#define pr_fmt(fmt) "ipmi-powernv: " fmt
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#include <linux/ipmi_smi.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <asm/opal.h>
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struct ipmi_smi_powernv {
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u64 interface_id;
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struct ipmi_device_id ipmi_id;
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ipmi_smi_t intf;
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u64 event;
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struct notifier_block event_nb;
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/**
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* We assume that there can only be one outstanding request, so
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* keep the pending message in cur_msg. We protect this from concurrent
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* updates through send & recv calls, (and consequently opal_msg, which
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* is in-use when cur_msg is set) with msg_lock
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*/
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spinlock_t msg_lock;
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struct ipmi_smi_msg *cur_msg;
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struct opal_ipmi_msg *opal_msg;
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};
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static int ipmi_powernv_start_processing(void *send_info, ipmi_smi_t intf)
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{
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struct ipmi_smi_powernv *smi = send_info;
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smi->intf = intf;
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return 0;
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}
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static void send_error_reply(struct ipmi_smi_powernv *smi,
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struct ipmi_smi_msg *msg, u8 completion_code)
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{
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msg->rsp[0] = msg->data[0] | 0x4;
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msg->rsp[1] = msg->data[1];
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msg->rsp[2] = completion_code;
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msg->rsp_size = 3;
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ipmi_smi_msg_received(smi->intf, msg);
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}
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static void ipmi_powernv_send(void *send_info, struct ipmi_smi_msg *msg)
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{
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struct ipmi_smi_powernv *smi = send_info;
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struct opal_ipmi_msg *opal_msg;
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unsigned long flags;
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int comp, rc;
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size_t size;
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/* ensure data_len will fit in the opal_ipmi_msg buffer... */
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if (msg->data_size > IPMI_MAX_MSG_LENGTH) {
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comp = IPMI_REQ_LEN_EXCEEDED_ERR;
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goto err;
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}
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/* ... and that we at least have netfn and cmd bytes */
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if (msg->data_size < 2) {
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comp = IPMI_REQ_LEN_INVALID_ERR;
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goto err;
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}
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spin_lock_irqsave(&smi->msg_lock, flags);
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if (smi->cur_msg) {
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comp = IPMI_NODE_BUSY_ERR;
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goto err_unlock;
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}
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/* format our data for the OPAL API */
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opal_msg = smi->opal_msg;
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opal_msg->version = OPAL_IPMI_MSG_FORMAT_VERSION_1;
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opal_msg->netfn = msg->data[0];
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opal_msg->cmd = msg->data[1];
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if (msg->data_size > 2)
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memcpy(opal_msg->data, msg->data + 2, msg->data_size - 2);
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/* data_size already includes the netfn and cmd bytes */
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size = sizeof(*opal_msg) + msg->data_size - 2;
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pr_devel("%s: opal_ipmi_send(0x%llx, %p, %ld)\n", __func__,
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smi->interface_id, opal_msg, size);
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rc = opal_ipmi_send(smi->interface_id, opal_msg, size);
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pr_devel("%s: -> %d\n", __func__, rc);
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if (!rc) {
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smi->cur_msg = msg;
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spin_unlock_irqrestore(&smi->msg_lock, flags);
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return;
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}
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comp = IPMI_ERR_UNSPECIFIED;
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err_unlock:
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spin_unlock_irqrestore(&smi->msg_lock, flags);
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err:
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send_error_reply(smi, msg, comp);
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}
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static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi)
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{
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struct opal_ipmi_msg *opal_msg;
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struct ipmi_smi_msg *msg;
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unsigned long flags;
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uint64_t size;
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int rc;
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pr_devel("%s: opal_ipmi_recv(%llx, msg, sz)\n", __func__,
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smi->interface_id);
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spin_lock_irqsave(&smi->msg_lock, flags);
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if (!smi->cur_msg) {
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pr_warn("no current message?\n");
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return 0;
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}
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msg = smi->cur_msg;
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opal_msg = smi->opal_msg;
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size = cpu_to_be64(sizeof(*opal_msg) + IPMI_MAX_MSG_LENGTH);
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rc = opal_ipmi_recv(smi->interface_id,
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opal_msg,
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&size);
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size = be64_to_cpu(size);
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pr_devel("%s: -> %d (size %lld)\n", __func__,
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rc, rc == 0 ? size : 0);
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if (rc) {
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spin_unlock_irqrestore(&smi->msg_lock, flags);
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ipmi_free_smi_msg(msg);
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return 0;
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}
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if (size < sizeof(*opal_msg)) {
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spin_unlock_irqrestore(&smi->msg_lock, flags);
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pr_warn("unexpected IPMI message size %lld\n", size);
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return 0;
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}
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if (opal_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) {
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spin_unlock_irqrestore(&smi->msg_lock, flags);
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pr_warn("unexpected IPMI message format (version %d)\n",
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opal_msg->version);
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return 0;
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}
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msg->rsp[0] = opal_msg->netfn;
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msg->rsp[1] = opal_msg->cmd;
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if (size > sizeof(*opal_msg))
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memcpy(&msg->rsp[2], opal_msg->data, size - sizeof(*opal_msg));
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msg->rsp_size = 2 + size - sizeof(*opal_msg);
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smi->cur_msg = NULL;
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spin_unlock_irqrestore(&smi->msg_lock, flags);
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ipmi_smi_msg_received(smi->intf, msg);
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return 0;
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}
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static void ipmi_powernv_request_events(void *send_info)
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{
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}
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static void ipmi_powernv_set_run_to_completion(void *send_info,
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bool run_to_completion)
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{
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}
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static void ipmi_powernv_poll(void *send_info)
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{
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struct ipmi_smi_powernv *smi = send_info;
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ipmi_powernv_recv(smi);
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}
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static struct ipmi_smi_handlers ipmi_powernv_smi_handlers = {
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.owner = THIS_MODULE,
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.start_processing = ipmi_powernv_start_processing,
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.sender = ipmi_powernv_send,
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.request_events = ipmi_powernv_request_events,
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.set_run_to_completion = ipmi_powernv_set_run_to_completion,
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.poll = ipmi_powernv_poll,
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};
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static int ipmi_opal_event(struct notifier_block *nb,
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unsigned long events, void *change)
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{
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struct ipmi_smi_powernv *smi = container_of(nb,
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struct ipmi_smi_powernv, event_nb);
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if (events & smi->event)
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ipmi_powernv_recv(smi);
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return 0;
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}
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static int ipmi_powernv_probe(struct platform_device *pdev)
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{
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struct ipmi_smi_powernv *ipmi;
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struct device *dev;
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u32 prop;
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int rc;
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if (!pdev || !pdev->dev.of_node)
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return -ENODEV;
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dev = &pdev->dev;
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ipmi = devm_kzalloc(dev, sizeof(*ipmi), GFP_KERNEL);
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if (!ipmi)
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return -ENOMEM;
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spin_lock_init(&ipmi->msg_lock);
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rc = of_property_read_u32(dev->of_node, "ibm,ipmi-interface-id",
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&prop);
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if (rc) {
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dev_warn(dev, "No interface ID property\n");
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goto err_free;
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}
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ipmi->interface_id = prop;
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rc = of_property_read_u32(dev->of_node, "interrupts", &prop);
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if (rc) {
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dev_warn(dev, "No interrupts property\n");
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goto err_free;
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}
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ipmi->event = 1ull << prop;
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ipmi->event_nb.notifier_call = ipmi_opal_event;
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rc = opal_notifier_register(&ipmi->event_nb);
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if (rc) {
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dev_warn(dev, "OPAL notifier registration failed (%d)\n", rc);
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goto err_free;
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}
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ipmi->opal_msg = devm_kmalloc(dev,
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sizeof(*ipmi->opal_msg) + IPMI_MAX_MSG_LENGTH,
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GFP_KERNEL);
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if (!ipmi->opal_msg) {
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rc = -ENOMEM;
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goto err_unregister;
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}
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/* todo: query actual ipmi_device_id */
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rc = ipmi_register_smi(&ipmi_powernv_smi_handlers, ipmi,
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&ipmi->ipmi_id, dev, 0);
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if (rc) {
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dev_warn(dev, "IPMI SMI registration failed (%d)\n", rc);
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goto err_free_msg;
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}
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dev_set_drvdata(dev, ipmi);
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return 0;
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err_free_msg:
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devm_kfree(dev, ipmi->opal_msg);
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err_unregister:
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opal_notifier_unregister(&ipmi->event_nb);
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err_free:
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devm_kfree(dev, ipmi);
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return rc;
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}
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static int ipmi_powernv_remove(struct platform_device *pdev)
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{
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struct ipmi_smi_powernv *smi = dev_get_drvdata(&pdev->dev);
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ipmi_unregister_smi(smi->intf);
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opal_notifier_unregister(&smi->event_nb);
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return 0;
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}
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static const struct of_device_id ipmi_powernv_match[] = {
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{ .compatible = "ibm,opal-ipmi" },
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{ },
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};
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static struct platform_driver powernv_ipmi_driver = {
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.driver = {
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.name = "ipmi-powernv",
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.owner = THIS_MODULE,
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.of_match_table = ipmi_powernv_match,
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},
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.probe = ipmi_powernv_probe,
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.remove = ipmi_powernv_remove,
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};
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module_platform_driver(powernv_ipmi_driver);
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MODULE_DEVICE_TABLE(of, ipmi_powernv_match);
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MODULE_DESCRIPTION("powernv IPMI driver");
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MODULE_AUTHOR("Jeremy Kerr <jk@ozlabs.org>");
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MODULE_LICENSE("GPL");
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