mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 14:46:39 +07:00
25985edced
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
585 lines
15 KiB
C
585 lines
15 KiB
C
/*
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* Functions to handle I2O devices
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*
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* Copyright (C) 2004 Markus Lidel <Markus.Lidel@shadowconnect.com>
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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
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* Fixes/additions:
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* Markus Lidel <Markus.Lidel@shadowconnect.com>
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* initial version.
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*/
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#include <linux/module.h>
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#include <linux/i2o.h>
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#include <linux/delay.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include "core.h"
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/**
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* i2o_device_issue_claim - claim or release a device
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* @dev: I2O device to claim or release
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* @cmd: claim or release command
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* @type: type of claim
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*
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* Issue I2O UTIL_CLAIM or UTIL_RELEASE messages. The message to be sent
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* is set by cmd. dev is the I2O device which should be claim or
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* released and the type is the claim type (see the I2O spec).
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*
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* Returs 0 on success or negative error code on failure.
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*/
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static inline int i2o_device_issue_claim(struct i2o_device *dev, u32 cmd,
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u32 type)
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{
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struct i2o_message *msg;
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msg = i2o_msg_get_wait(dev->iop, I2O_TIMEOUT_MESSAGE_GET);
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if (IS_ERR(msg))
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return PTR_ERR(msg);
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msg->u.head[0] = cpu_to_le32(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0);
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msg->u.head[1] =
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cpu_to_le32(cmd << 24 | HOST_TID << 12 | dev->lct_data.tid);
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msg->body[0] = cpu_to_le32(type);
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return i2o_msg_post_wait(dev->iop, msg, 60);
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}
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/**
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* i2o_device_claim - claim a device for use by an OSM
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* @dev: I2O device to claim
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*
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* Do the leg work to assign a device to a given OSM. If the claim succeeds,
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* the owner is the primary. If the attempt fails a negative errno code
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* is returned. On success zero is returned.
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*/
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int i2o_device_claim(struct i2o_device *dev)
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{
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int rc = 0;
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mutex_lock(&dev->lock);
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rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_CLAIM, I2O_CLAIM_PRIMARY);
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if (!rc)
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pr_debug("i2o: claim of device %d succeeded\n",
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dev->lct_data.tid);
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else
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pr_debug("i2o: claim of device %d failed %d\n",
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dev->lct_data.tid, rc);
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mutex_unlock(&dev->lock);
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return rc;
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}
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/**
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* i2o_device_claim_release - release a device that the OSM is using
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* @dev: device to release
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*
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* Drop a claim by an OSM on a given I2O device.
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*
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* AC - some devices seem to want to refuse an unclaim until they have
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* finished internal processing. It makes sense since you don't want a
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* new device to go reconfiguring the entire system until you are done.
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* Thus we are prepared to wait briefly.
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*
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* Returns 0 on success or negative error code on failure.
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*/
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int i2o_device_claim_release(struct i2o_device *dev)
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{
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int tries;
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int rc = 0;
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mutex_lock(&dev->lock);
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/*
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* If the controller takes a nonblocking approach to
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* releases we have to sleep/poll for a few times.
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*/
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for (tries = 0; tries < 10; tries++) {
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rc = i2o_device_issue_claim(dev, I2O_CMD_UTIL_RELEASE,
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I2O_CLAIM_PRIMARY);
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if (!rc)
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break;
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ssleep(1);
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}
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if (!rc)
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pr_debug("i2o: claim release of device %d succeeded\n",
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dev->lct_data.tid);
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else
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pr_debug("i2o: claim release of device %d failed %d\n",
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dev->lct_data.tid, rc);
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mutex_unlock(&dev->lock);
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return rc;
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}
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/**
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* i2o_device_release - release the memory for a I2O device
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* @dev: I2O device which should be released
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*
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* Release the allocated memory. This function is called if refcount of
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* device reaches 0 automatically.
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*/
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static void i2o_device_release(struct device *dev)
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{
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struct i2o_device *i2o_dev = to_i2o_device(dev);
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pr_debug("i2o: device %s released\n", dev_name(dev));
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kfree(i2o_dev);
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}
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/**
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* i2o_device_show_class_id - Displays class id of I2O device
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* @dev: device of which the class id should be displayed
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* @attr: pointer to device attribute
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* @buf: buffer into which the class id should be printed
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*
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* Returns the number of bytes which are printed into the buffer.
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*/
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static ssize_t i2o_device_show_class_id(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct i2o_device *i2o_dev = to_i2o_device(dev);
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sprintf(buf, "0x%03x\n", i2o_dev->lct_data.class_id);
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return strlen(buf) + 1;
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}
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/**
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* i2o_device_show_tid - Displays TID of I2O device
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* @dev: device of which the TID should be displayed
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* @attr: pointer to device attribute
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* @buf: buffer into which the TID should be printed
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*
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* Returns the number of bytes which are printed into the buffer.
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*/
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static ssize_t i2o_device_show_tid(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct i2o_device *i2o_dev = to_i2o_device(dev);
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sprintf(buf, "0x%03x\n", i2o_dev->lct_data.tid);
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return strlen(buf) + 1;
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}
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/* I2O device attributes */
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struct device_attribute i2o_device_attrs[] = {
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__ATTR(class_id, S_IRUGO, i2o_device_show_class_id, NULL),
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__ATTR(tid, S_IRUGO, i2o_device_show_tid, NULL),
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__ATTR_NULL
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};
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/**
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* i2o_device_alloc - Allocate a I2O device and initialize it
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*
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* Allocate the memory for a I2O device and initialize locks and lists
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*
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* Returns the allocated I2O device or a negative error code if the device
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* could not be allocated.
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*/
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static struct i2o_device *i2o_device_alloc(void)
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{
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struct i2o_device *dev;
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dev = kzalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return ERR_PTR(-ENOMEM);
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INIT_LIST_HEAD(&dev->list);
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mutex_init(&dev->lock);
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dev->device.bus = &i2o_bus_type;
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dev->device.release = &i2o_device_release;
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return dev;
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}
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/**
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* i2o_device_add - allocate a new I2O device and add it to the IOP
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* @c: I2O controller that the device is on
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* @entry: LCT entry of the I2O device
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*
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* Allocate a new I2O device and initialize it with the LCT entry. The
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* device is appended to the device list of the controller.
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*
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* Returns zero on success, or a -ve errno.
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*/
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static int i2o_device_add(struct i2o_controller *c, i2o_lct_entry *entry)
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{
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struct i2o_device *i2o_dev, *tmp;
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int rc;
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i2o_dev = i2o_device_alloc();
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if (IS_ERR(i2o_dev)) {
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printk(KERN_ERR "i2o: unable to allocate i2o device\n");
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return PTR_ERR(i2o_dev);
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}
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i2o_dev->lct_data = *entry;
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dev_set_name(&i2o_dev->device, "%d:%03x", c->unit,
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i2o_dev->lct_data.tid);
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i2o_dev->iop = c;
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i2o_dev->device.parent = &c->device;
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rc = device_register(&i2o_dev->device);
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if (rc)
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goto err;
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list_add_tail(&i2o_dev->list, &c->devices);
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/* create user entries for this device */
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tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.user_tid);
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if (tmp && (tmp != i2o_dev)) {
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rc = sysfs_create_link(&i2o_dev->device.kobj,
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&tmp->device.kobj, "user");
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if (rc)
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goto unreg_dev;
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}
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/* create user entries referring to this device */
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list_for_each_entry(tmp, &c->devices, list)
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if ((tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
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&& (tmp != i2o_dev)) {
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rc = sysfs_create_link(&tmp->device.kobj,
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&i2o_dev->device.kobj, "user");
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if (rc)
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goto rmlink1;
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}
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/* create parent entries for this device */
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tmp = i2o_iop_find_device(i2o_dev->iop, i2o_dev->lct_data.parent_tid);
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if (tmp && (tmp != i2o_dev)) {
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rc = sysfs_create_link(&i2o_dev->device.kobj,
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&tmp->device.kobj, "parent");
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if (rc)
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goto rmlink1;
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}
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/* create parent entries referring to this device */
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list_for_each_entry(tmp, &c->devices, list)
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if ((tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
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&& (tmp != i2o_dev)) {
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rc = sysfs_create_link(&tmp->device.kobj,
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&i2o_dev->device.kobj, "parent");
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if (rc)
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goto rmlink2;
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}
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i2o_driver_notify_device_add_all(i2o_dev);
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pr_debug("i2o: device %s added\n", dev_name(&i2o_dev->device));
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return 0;
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rmlink2:
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/* If link creating failed halfway, we loop whole list to cleanup.
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* And we don't care wrong removing of link, because sysfs_remove_link
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* will take care of it.
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*/
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list_for_each_entry(tmp, &c->devices, list) {
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if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
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sysfs_remove_link(&tmp->device.kobj, "parent");
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}
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sysfs_remove_link(&i2o_dev->device.kobj, "parent");
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rmlink1:
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list_for_each_entry(tmp, &c->devices, list)
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if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
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sysfs_remove_link(&tmp->device.kobj, "user");
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sysfs_remove_link(&i2o_dev->device.kobj, "user");
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unreg_dev:
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list_del(&i2o_dev->list);
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device_unregister(&i2o_dev->device);
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err:
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kfree(i2o_dev);
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return rc;
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}
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/**
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* i2o_device_remove - remove an I2O device from the I2O core
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* @i2o_dev: I2O device which should be released
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*
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* Is used on I2O controller removal or LCT modification, when the device
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* is removed from the system. Note that the device could still hang
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* around until the refcount reaches 0.
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*/
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void i2o_device_remove(struct i2o_device *i2o_dev)
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{
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struct i2o_device *tmp;
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struct i2o_controller *c = i2o_dev->iop;
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i2o_driver_notify_device_remove_all(i2o_dev);
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sysfs_remove_link(&i2o_dev->device.kobj, "parent");
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sysfs_remove_link(&i2o_dev->device.kobj, "user");
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list_for_each_entry(tmp, &c->devices, list) {
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if (tmp->lct_data.parent_tid == i2o_dev->lct_data.tid)
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sysfs_remove_link(&tmp->device.kobj, "parent");
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if (tmp->lct_data.user_tid == i2o_dev->lct_data.tid)
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sysfs_remove_link(&tmp->device.kobj, "user");
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}
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list_del(&i2o_dev->list);
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device_unregister(&i2o_dev->device);
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}
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/**
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* i2o_device_parse_lct - Parse a previously fetched LCT and create devices
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* @c: I2O controller from which the LCT should be parsed.
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*
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* The Logical Configuration Table tells us what we can talk to on the
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* board. For every entry we create an I2O device, which is registered in
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* the I2O core.
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*
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* Returns 0 on success or negative error code on failure.
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*/
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int i2o_device_parse_lct(struct i2o_controller *c)
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{
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struct i2o_device *dev, *tmp;
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i2o_lct *lct;
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u32 *dlct = c->dlct.virt;
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int max = 0, i = 0;
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u16 table_size;
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u32 buf;
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mutex_lock(&c->lct_lock);
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kfree(c->lct);
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buf = le32_to_cpu(*dlct++);
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table_size = buf & 0xffff;
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lct = c->lct = kmalloc(table_size * 4, GFP_KERNEL);
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if (!lct) {
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mutex_unlock(&c->lct_lock);
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return -ENOMEM;
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}
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lct->lct_ver = buf >> 28;
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lct->boot_tid = buf >> 16 & 0xfff;
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lct->table_size = table_size;
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lct->change_ind = le32_to_cpu(*dlct++);
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lct->iop_flags = le32_to_cpu(*dlct++);
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table_size -= 3;
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pr_debug("%s: LCT has %d entries (LCT size: %d)\n", c->name, max,
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lct->table_size);
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while (table_size > 0) {
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i2o_lct_entry *entry = &lct->lct_entry[max];
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int found = 0;
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buf = le32_to_cpu(*dlct++);
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entry->entry_size = buf & 0xffff;
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entry->tid = buf >> 16 & 0xfff;
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entry->change_ind = le32_to_cpu(*dlct++);
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entry->device_flags = le32_to_cpu(*dlct++);
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buf = le32_to_cpu(*dlct++);
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entry->class_id = buf & 0xfff;
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entry->version = buf >> 12 & 0xf;
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entry->vendor_id = buf >> 16;
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entry->sub_class = le32_to_cpu(*dlct++);
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buf = le32_to_cpu(*dlct++);
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entry->user_tid = buf & 0xfff;
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entry->parent_tid = buf >> 12 & 0xfff;
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entry->bios_info = buf >> 24;
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memcpy(&entry->identity_tag, dlct, 8);
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dlct += 2;
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entry->event_capabilities = le32_to_cpu(*dlct++);
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/* add new devices, which are new in the LCT */
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list_for_each_entry_safe(dev, tmp, &c->devices, list) {
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if (entry->tid == dev->lct_data.tid) {
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found = 1;
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break;
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}
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}
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if (!found)
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i2o_device_add(c, entry);
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table_size -= 9;
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max++;
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}
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/* remove devices, which are not in the LCT anymore */
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list_for_each_entry_safe(dev, tmp, &c->devices, list) {
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int found = 0;
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for (i = 0; i < max; i++) {
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if (lct->lct_entry[i].tid == dev->lct_data.tid) {
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found = 1;
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break;
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}
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}
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if (!found)
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i2o_device_remove(dev);
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}
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mutex_unlock(&c->lct_lock);
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return 0;
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}
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/*
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* Run time support routines
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*/
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/* Issue UTIL_PARAMS_GET or UTIL_PARAMS_SET
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*
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* This function can be used for all UtilParamsGet/Set operations.
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* The OperationList is given in oplist-buffer,
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* and results are returned in reslist-buffer.
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* Note that the minimum sized reslist is 8 bytes and contains
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* ResultCount, ErrorInfoSize, BlockStatus and BlockSize.
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*/
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int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist,
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int oplen, void *reslist, int reslen)
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{
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struct i2o_message *msg;
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int i = 0;
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int rc;
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struct i2o_dma res;
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struct i2o_controller *c = i2o_dev->iop;
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struct device *dev = &c->pdev->dev;
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res.virt = NULL;
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if (i2o_dma_alloc(dev, &res, reslen))
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return -ENOMEM;
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msg = i2o_msg_get_wait(c, I2O_TIMEOUT_MESSAGE_GET);
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if (IS_ERR(msg)) {
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i2o_dma_free(dev, &res);
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return PTR_ERR(msg);
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}
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i = 0;
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msg->u.head[1] =
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cpu_to_le32(cmd << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid);
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msg->body[i++] = cpu_to_le32(0x00000000);
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msg->body[i++] = cpu_to_le32(0x4C000000 | oplen); /* OperationList */
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memcpy(&msg->body[i], oplist, oplen);
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i += (oplen / 4 + (oplen % 4 ? 1 : 0));
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msg->body[i++] = cpu_to_le32(0xD0000000 | res.len); /* ResultList */
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msg->body[i++] = cpu_to_le32(res.phys);
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msg->u.head[0] =
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cpu_to_le32(I2O_MESSAGE_SIZE(i + sizeof(struct i2o_message) / 4) |
|
|
SGL_OFFSET_5);
|
|
|
|
rc = i2o_msg_post_wait_mem(c, msg, 10, &res);
|
|
|
|
/* This only looks like a memory leak - don't "fix" it. */
|
|
if (rc == -ETIMEDOUT)
|
|
return rc;
|
|
|
|
memcpy(reslist, res.virt, res.len);
|
|
i2o_dma_free(dev, &res);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Query one field group value or a whole scalar group.
|
|
*/
|
|
int i2o_parm_field_get(struct i2o_device *i2o_dev, int group, int field,
|
|
void *buf, int buflen)
|
|
{
|
|
u32 opblk[] = { cpu_to_le32(0x00000001),
|
|
cpu_to_le32((u16) group << 16 | I2O_PARAMS_FIELD_GET),
|
|
cpu_to_le32((s16) field << 16 | 0x00000001)
|
|
};
|
|
u8 *resblk; /* 8 bytes for header */
|
|
int rc;
|
|
|
|
resblk = kmalloc(buflen + 8, GFP_KERNEL);
|
|
if (!resblk)
|
|
return -ENOMEM;
|
|
|
|
rc = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
|
|
sizeof(opblk), resblk, buflen + 8);
|
|
|
|
memcpy(buf, resblk + 8, buflen); /* cut off header */
|
|
|
|
kfree(resblk);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* if oper == I2O_PARAMS_TABLE_GET, get from all rows
|
|
* if fieldcount == -1 return all fields
|
|
* ibuf and ibuflen are unused (use NULL, 0)
|
|
* else return specific fields
|
|
* ibuf contains fieldindexes
|
|
*
|
|
* if oper == I2O_PARAMS_LIST_GET, get from specific rows
|
|
* if fieldcount == -1 return all fields
|
|
* ibuf contains rowcount, keyvalues
|
|
* else return specific fields
|
|
* fieldcount is # of fieldindexes
|
|
* ibuf contains fieldindexes, rowcount, keyvalues
|
|
*
|
|
* You could also use directly function i2o_issue_params().
|
|
*/
|
|
int i2o_parm_table_get(struct i2o_device *dev, int oper, int group,
|
|
int fieldcount, void *ibuf, int ibuflen, void *resblk,
|
|
int reslen)
|
|
{
|
|
u16 *opblk;
|
|
int size;
|
|
|
|
size = 10 + ibuflen;
|
|
if (size % 4)
|
|
size += 4 - size % 4;
|
|
|
|
opblk = kmalloc(size, GFP_KERNEL);
|
|
if (opblk == NULL) {
|
|
printk(KERN_ERR "i2o: no memory for query buffer.\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
opblk[0] = 1; /* operation count */
|
|
opblk[1] = 0; /* pad */
|
|
opblk[2] = oper;
|
|
opblk[3] = group;
|
|
opblk[4] = fieldcount;
|
|
memcpy(opblk + 5, ibuf, ibuflen); /* other params */
|
|
|
|
size = i2o_parm_issue(dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
|
|
size, resblk, reslen);
|
|
|
|
kfree(opblk);
|
|
if (size > reslen)
|
|
return reslen;
|
|
|
|
return size;
|
|
}
|
|
|
|
EXPORT_SYMBOL(i2o_device_claim);
|
|
EXPORT_SYMBOL(i2o_device_claim_release);
|
|
EXPORT_SYMBOL(i2o_parm_field_get);
|
|
EXPORT_SYMBOL(i2o_parm_table_get);
|
|
EXPORT_SYMBOL(i2o_parm_issue);
|