Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Jeremy Kerr | 1227 | 89.76% | 1 | 12.50% |
Alistair Popple | 92 | 6.73% | 2 | 25.00% |
Neelesh Gupta | 33 | 2.41% | 1 | 12.50% |
Corey Minyard | 8 | 0.59% | 2 | 25.00% |
Wei Yongjun | 6 | 0.44% | 1 | 12.50% |
Bhumika Goyal | 1 | 0.07% | 1 | 12.50% |
Total | 1367 | 8 |
// SPDX-License-Identifier: GPL-2.0+ /* * PowerNV OPAL IPMI driver * * Copyright 2014 IBM Corp. */ #define pr_fmt(fmt) "ipmi-powernv: " fmt #include <linux/ipmi_smi.h> #include <linux/list.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/interrupt.h> #include <asm/opal.h> struct ipmi_smi_powernv { u64 interface_id; struct ipmi_smi *intf; unsigned int irq; /** * We assume that there can only be one outstanding request, so * keep the pending message in cur_msg. We protect this from concurrent * updates through send & recv calls, (and consequently opal_msg, which * is in-use when cur_msg is set) with msg_lock */ spinlock_t msg_lock; struct ipmi_smi_msg *cur_msg; struct opal_ipmi_msg *opal_msg; }; static int ipmi_powernv_start_processing(void *send_info, struct ipmi_smi *intf) { struct ipmi_smi_powernv *smi = send_info; smi->intf = intf; return 0; } static void send_error_reply(struct ipmi_smi_powernv *smi, struct ipmi_smi_msg *msg, u8 completion_code) { msg->rsp[0] = msg->data[0] | 0x4; msg->rsp[1] = msg->data[1]; msg->rsp[2] = completion_code; msg->rsp_size = 3; ipmi_smi_msg_received(smi->intf, msg); } static void ipmi_powernv_send(void *send_info, struct ipmi_smi_msg *msg) { struct ipmi_smi_powernv *smi = send_info; struct opal_ipmi_msg *opal_msg; unsigned long flags; int comp, rc; size_t size; /* ensure data_len will fit in the opal_ipmi_msg buffer... */ if (msg->data_size > IPMI_MAX_MSG_LENGTH) { comp = IPMI_REQ_LEN_EXCEEDED_ERR; goto err; } /* ... and that we at least have netfn and cmd bytes */ if (msg->data_size < 2) { comp = IPMI_REQ_LEN_INVALID_ERR; goto err; } spin_lock_irqsave(&smi->msg_lock, flags); if (smi->cur_msg) { comp = IPMI_NODE_BUSY_ERR; goto err_unlock; } /* format our data for the OPAL API */ opal_msg = smi->opal_msg; opal_msg->version = OPAL_IPMI_MSG_FORMAT_VERSION_1; opal_msg->netfn = msg->data[0]; opal_msg->cmd = msg->data[1]; if (msg->data_size > 2) memcpy(opal_msg->data, msg->data + 2, msg->data_size - 2); /* data_size already includes the netfn and cmd bytes */ size = sizeof(*opal_msg) + msg->data_size - 2; pr_devel("%s: opal_ipmi_send(0x%llx, %p, %ld)\n", __func__, smi->interface_id, opal_msg, size); rc = opal_ipmi_send(smi->interface_id, opal_msg, size); pr_devel("%s: -> %d\n", __func__, rc); if (!rc) { smi->cur_msg = msg; spin_unlock_irqrestore(&smi->msg_lock, flags); return; } comp = IPMI_ERR_UNSPECIFIED; err_unlock: spin_unlock_irqrestore(&smi->msg_lock, flags); err: send_error_reply(smi, msg, comp); } static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi) { struct opal_ipmi_msg *opal_msg; struct ipmi_smi_msg *msg; unsigned long flags; uint64_t size; int rc; pr_devel("%s: opal_ipmi_recv(%llx, msg, sz)\n", __func__, smi->interface_id); spin_lock_irqsave(&smi->msg_lock, flags); if (!smi->cur_msg) { spin_unlock_irqrestore(&smi->msg_lock, flags); pr_warn("no current message?\n"); return 0; } msg = smi->cur_msg; opal_msg = smi->opal_msg; size = cpu_to_be64(sizeof(*opal_msg) + IPMI_MAX_MSG_LENGTH); rc = opal_ipmi_recv(smi->interface_id, opal_msg, &size); size = be64_to_cpu(size); pr_devel("%s: -> %d (size %lld)\n", __func__, rc, rc == 0 ? size : 0); if (rc) { /* If came via the poll, and response was not yet ready */ if (rc == OPAL_EMPTY) { spin_unlock_irqrestore(&smi->msg_lock, flags); return 0; } smi->cur_msg = NULL; spin_unlock_irqrestore(&smi->msg_lock, flags); send_error_reply(smi, msg, IPMI_ERR_UNSPECIFIED); return 0; } if (size < sizeof(*opal_msg)) { spin_unlock_irqrestore(&smi->msg_lock, flags); pr_warn("unexpected IPMI message size %lld\n", size); return 0; } if (opal_msg->version != OPAL_IPMI_MSG_FORMAT_VERSION_1) { spin_unlock_irqrestore(&smi->msg_lock, flags); pr_warn("unexpected IPMI message format (version %d)\n", opal_msg->version); return 0; } msg->rsp[0] = opal_msg->netfn; msg->rsp[1] = opal_msg->cmd; if (size > sizeof(*opal_msg)) memcpy(&msg->rsp[2], opal_msg->data, size - sizeof(*opal_msg)); msg->rsp_size = 2 + size - sizeof(*opal_msg); smi->cur_msg = NULL; spin_unlock_irqrestore(&smi->msg_lock, flags); ipmi_smi_msg_received(smi->intf, msg); return 0; } static void ipmi_powernv_request_events(void *send_info) { } static void ipmi_powernv_set_run_to_completion(void *send_info, bool run_to_completion) { } static void ipmi_powernv_poll(void *send_info) { struct ipmi_smi_powernv *smi = send_info; ipmi_powernv_recv(smi); } static const struct ipmi_smi_handlers ipmi_powernv_smi_handlers = { .owner = THIS_MODULE, .start_processing = ipmi_powernv_start_processing, .sender = ipmi_powernv_send, .request_events = ipmi_powernv_request_events, .set_run_to_completion = ipmi_powernv_set_run_to_completion, .poll = ipmi_powernv_poll, }; static irqreturn_t ipmi_opal_event(int irq, void *data) { struct ipmi_smi_powernv *smi = data; ipmi_powernv_recv(smi); return IRQ_HANDLED; } static int ipmi_powernv_probe(struct platform_device *pdev) { struct ipmi_smi_powernv *ipmi; struct device *dev; u32 prop; int rc; if (!pdev || !pdev->dev.of_node) return -ENODEV; dev = &pdev->dev; ipmi = devm_kzalloc(dev, sizeof(*ipmi), GFP_KERNEL); if (!ipmi) return -ENOMEM; spin_lock_init(&ipmi->msg_lock); rc = of_property_read_u32(dev->of_node, "ibm,ipmi-interface-id", &prop); if (rc) { dev_warn(dev, "No interface ID property\n"); goto err_free; } ipmi->interface_id = prop; rc = of_property_read_u32(dev->of_node, "interrupts", &prop); if (rc) { dev_warn(dev, "No interrupts property\n"); goto err_free; } ipmi->irq = irq_of_parse_and_map(dev->of_node, 0); if (!ipmi->irq) { dev_info(dev, "Unable to map irq from device tree\n"); ipmi->irq = opal_event_request(prop); } rc = request_irq(ipmi->irq, ipmi_opal_event, IRQ_TYPE_LEVEL_HIGH, "opal-ipmi", ipmi); if (rc) { dev_warn(dev, "Unable to request irq\n"); goto err_dispose; } ipmi->opal_msg = devm_kmalloc(dev, sizeof(*ipmi->opal_msg) + IPMI_MAX_MSG_LENGTH, GFP_KERNEL); if (!ipmi->opal_msg) { rc = -ENOMEM; goto err_unregister; } rc = ipmi_register_smi(&ipmi_powernv_smi_handlers, ipmi, dev, 0); if (rc) { dev_warn(dev, "IPMI SMI registration failed (%d)\n", rc); goto err_free_msg; } dev_set_drvdata(dev, ipmi); return 0; err_free_msg: devm_kfree(dev, ipmi->opal_msg); err_unregister: free_irq(ipmi->irq, ipmi); err_dispose: irq_dispose_mapping(ipmi->irq); err_free: devm_kfree(dev, ipmi); return rc; } static int ipmi_powernv_remove(struct platform_device *pdev) { struct ipmi_smi_powernv *smi = dev_get_drvdata(&pdev->dev); ipmi_unregister_smi(smi->intf); free_irq(smi->irq, smi); irq_dispose_mapping(smi->irq); return 0; } static const struct of_device_id ipmi_powernv_match[] = { { .compatible = "ibm,opal-ipmi" }, { }, }; static struct platform_driver powernv_ipmi_driver = { .driver = { .name = "ipmi-powernv", .of_match_table = ipmi_powernv_match, }, .probe = ipmi_powernv_probe, .remove = ipmi_powernv_remove, }; module_platform_driver(powernv_ipmi_driver); MODULE_DEVICE_TABLE(of, ipmi_powernv_match); MODULE_DESCRIPTION("powernv IPMI driver"); MODULE_AUTHOR("Jeremy Kerr <jk@ozlabs.org>"); MODULE_LICENSE("GPL");
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