Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
634
drivers/message/i2o/device.c
Normal file
634
drivers/message/i2o/device.c
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@@ -0,0 +1,634 @@
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/*
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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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/* Exec OSM functions */
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extern struct bus_type i2o_bus_type;
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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 __iomem *msg;
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u32 m;
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m = i2o_msg_get_wait(dev->iop, &msg, I2O_TIMEOUT_MESSAGE_GET);
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if (m == I2O_QUEUE_EMPTY)
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return -ETIMEDOUT;
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writel(FIVE_WORD_MSG_SIZE | SGL_OFFSET_0, &msg->u.head[0]);
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writel(cmd << 24 | HOST_TID << 12 | dev->lct_data.tid, &msg->u.head[1]);
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writel(type, &msg->body[0]);
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return i2o_msg_post_wait(dev->iop, m, 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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* @drv: I2O driver which wants to claim the device
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*
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* Do the leg work to assign a device to a given OSM. If the claim succeed
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* the owner of the rimary. 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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down(&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 succeded\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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up(&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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* @drv: driver which claimed the device
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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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down(&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 succeded\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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up(&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->bus_id);
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kfree(i2o_dev);
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};
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/**
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* i2o_device_class_release - Remove I2O device attributes
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* @cd: I2O class device which is added to the I2O device class
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*
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* Removes attributes from the I2O device again. Also search each device
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* on the controller for I2O devices which refert to this device as parent
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* or user and remove this links also.
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*/
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static void i2o_device_class_release(struct class_device *cd)
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{
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struct i2o_device *i2o_dev, *tmp;
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struct i2o_controller *c;
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i2o_dev = to_i2o_device(cd->dev);
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c = i2o_dev->iop;
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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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};
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/* I2O device class */
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static struct class i2o_device_class = {
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.name = "i2o_device",
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.release = i2o_device_class_release
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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 = kmalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return ERR_PTR(-ENOMEM);
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memset(dev, 0, sizeof(*dev));
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INIT_LIST_HEAD(&dev->list);
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init_MUTEX(&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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dev->classdev.class = &i2o_device_class;
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dev->classdev.dev = &dev->device;
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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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* @iop: I2O controller where 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 a pointer to the I2O device on success or negative error code
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* on failure.
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*/
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static struct i2o_device *i2o_device_add(struct i2o_controller *c,
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i2o_lct_entry * entry)
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{
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struct i2o_device *dev;
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dev = i2o_device_alloc();
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if (IS_ERR(dev)) {
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printk(KERN_ERR "i2o: unable to allocate i2o device\n");
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return dev;
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}
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dev->lct_data = *entry;
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snprintf(dev->device.bus_id, BUS_ID_SIZE, "%d:%03x", c->unit,
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dev->lct_data.tid);
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snprintf(dev->classdev.class_id, BUS_ID_SIZE, "%d:%03x", c->unit,
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dev->lct_data.tid);
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dev->iop = c;
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dev->device.parent = &c->device;
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device_register(&dev->device);
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list_add_tail(&dev->list, &c->devices);
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class_device_register(&dev->classdev);
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i2o_driver_notify_device_add_all(dev);
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pr_debug("i2o: device %s added\n", dev->device.bus_id);
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return dev;
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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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* @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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i2o_driver_notify_device_remove_all(i2o_dev);
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class_device_unregister(&i2o_dev->classdev);
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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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int i;
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int max;
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down(&c->lct_lock);
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if (c->lct)
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kfree(c->lct);
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lct = c->dlct.virt;
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c->lct = kmalloc(lct->table_size * 4, GFP_KERNEL);
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if (!c->lct) {
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up(&c->lct_lock);
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return -ENOMEM;
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}
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if (lct->table_size * 4 > c->dlct.len) {
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memcpy_fromio(c->lct, c->dlct.virt, c->dlct.len);
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up(&c->lct_lock);
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return -EAGAIN;
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}
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memcpy_fromio(c->lct, c->dlct.virt, lct->table_size * 4);
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lct = c->lct;
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max = (lct->table_size - 3) / 9;
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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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/* 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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/* add new devices, which are new in the LCT */
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for (i = 0; i < max; i++) {
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int found = 0;
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list_for_each_entry_safe(dev, tmp, &c->devices, list) {
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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_add(c, &lct->lct_entry[i]);
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}
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up(&c->lct_lock);
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return 0;
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};
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/**
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* i2o_device_class_show_class_id - Displays class id of I2O device
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* @cd: class device of which the class id should be displayed
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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_class_show_class_id(struct class_device *cd,
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char *buf)
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{
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struct i2o_device *dev = to_i2o_device(cd->dev);
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sprintf(buf, "%03x\n", 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_class_show_tid - Displays TID of I2O device
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* @cd: class device of which the TID should be displayed
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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_class_show_tid(struct class_device *cd, char *buf)
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{
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struct i2o_device *dev = to_i2o_device(cd->dev);
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sprintf(buf, "%03x\n", dev->lct_data.tid);
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return strlen(buf) + 1;
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};
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/* I2O device class attributes */
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static CLASS_DEVICE_ATTR(class_id, S_IRUGO, i2o_device_class_show_class_id,
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NULL);
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static CLASS_DEVICE_ATTR(tid, S_IRUGO, i2o_device_class_show_tid, NULL);
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/**
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* i2o_device_class_add - Adds attributes to the I2O device
|
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* @cd: I2O class device which is added to the I2O device class
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*
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* This function get called when a I2O device is added to the class. It
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* creates the attributes for each device and creates user/parent symlink
|
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* if necessary.
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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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static int i2o_device_class_add(struct class_device *cd)
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{
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struct i2o_device *i2o_dev, *tmp;
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struct i2o_controller *c;
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i2o_dev = to_i2o_device(cd->dev);
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c = i2o_dev->iop;
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class_device_create_file(cd, &class_device_attr_class_id);
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class_device_create_file(cd, &class_device_attr_tid);
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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)
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sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj,
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"user");
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/* create user entries refering 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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sysfs_create_link(&tmp->device.kobj,
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&i2o_dev->device.kobj, "user");
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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)
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sysfs_create_link(&i2o_dev->device.kobj, &tmp->device.kobj,
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"parent");
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/* create parent entries refering 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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sysfs_create_link(&tmp->device.kobj,
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&i2o_dev->device.kobj, "parent");
|
||||
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return 0;
|
||||
};
|
||||
|
||||
/* I2O device class interface */
|
||||
static struct class_interface i2o_device_class_interface = {
|
||||
.class = &i2o_device_class,
|
||||
.add = i2o_device_class_add
|
||||
};
|
||||
|
||||
/*
|
||||
* Run time support routines
|
||||
*/
|
||||
|
||||
/* Issue UTIL_PARAMS_GET or UTIL_PARAMS_SET
|
||||
*
|
||||
* This function can be used for all UtilParamsGet/Set operations.
|
||||
* The OperationList is given in oplist-buffer,
|
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* and results are returned in reslist-buffer.
|
||||
* Note that the minimum sized reslist is 8 bytes and contains
|
||||
* ResultCount, ErrorInfoSize, BlockStatus and BlockSize.
|
||||
*/
|
||||
|
||||
int i2o_parm_issue(struct i2o_device *i2o_dev, int cmd, void *oplist,
|
||||
int oplen, void *reslist, int reslen)
|
||||
{
|
||||
struct i2o_message __iomem *msg;
|
||||
u32 m;
|
||||
u32 *res32 = (u32 *) reslist;
|
||||
u32 *restmp = (u32 *) reslist;
|
||||
int len = 0;
|
||||
int i = 0;
|
||||
int rc;
|
||||
struct i2o_dma res;
|
||||
struct i2o_controller *c = i2o_dev->iop;
|
||||
struct device *dev = &c->pdev->dev;
|
||||
|
||||
res.virt = NULL;
|
||||
|
||||
if (i2o_dma_alloc(dev, &res, reslen, GFP_KERNEL))
|
||||
return -ENOMEM;
|
||||
|
||||
m = i2o_msg_get_wait(c, &msg, I2O_TIMEOUT_MESSAGE_GET);
|
||||
if (m == I2O_QUEUE_EMPTY) {
|
||||
i2o_dma_free(dev, &res);
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
i = 0;
|
||||
writel(cmd << 24 | HOST_TID << 12 | i2o_dev->lct_data.tid,
|
||||
&msg->u.head[1]);
|
||||
writel(0, &msg->body[i++]);
|
||||
writel(0x4C000000 | oplen, &msg->body[i++]); /* OperationList */
|
||||
memcpy_toio(&msg->body[i], oplist, oplen);
|
||||
i += (oplen / 4 + (oplen % 4 ? 1 : 0));
|
||||
writel(0xD0000000 | res.len, &msg->body[i++]); /* ResultList */
|
||||
writel(res.phys, &msg->body[i++]);
|
||||
|
||||
writel(I2O_MESSAGE_SIZE(i + sizeof(struct i2o_message) / 4) |
|
||||
SGL_OFFSET_5, &msg->u.head[0]);
|
||||
|
||||
rc = i2o_msg_post_wait_mem(c, m, 10, &res);
|
||||
|
||||
/* This only looks like a memory leak - don't "fix" it. */
|
||||
if (rc == -ETIMEDOUT)
|
||||
return rc;
|
||||
|
||||
memcpy_fromio(reslist, res.virt, res.len);
|
||||
i2o_dma_free(dev, &res);
|
||||
|
||||
/* Query failed */
|
||||
if (rc)
|
||||
return rc;
|
||||
/*
|
||||
* Calculate number of bytes of Result LIST
|
||||
* We need to loop through each Result BLOCK and grab the length
|
||||
*/
|
||||
restmp = res32 + 1;
|
||||
len = 1;
|
||||
for (i = 0; i < (res32[0] & 0X0000FFFF); i++) {
|
||||
if (restmp[0] & 0x00FF0000) { /* BlockStatus != SUCCESS */
|
||||
printk(KERN_WARNING
|
||||
"%s - Error:\n ErrorInfoSize = 0x%02x, "
|
||||
"BlockStatus = 0x%02x, BlockSize = 0x%04x\n",
|
||||
(cmd ==
|
||||
I2O_CMD_UTIL_PARAMS_SET) ? "PARAMS_SET" :
|
||||
"PARAMS_GET", res32[1] >> 24,
|
||||
(res32[1] >> 16) & 0xFF, res32[1] & 0xFFFF);
|
||||
|
||||
/*
|
||||
* If this is the only request,than we return an error
|
||||
*/
|
||||
if ((res32[0] & 0x0000FFFF) == 1) {
|
||||
return -((res32[1] >> 16) & 0xFF); /* -BlockStatus */
|
||||
}
|
||||
}
|
||||
len += restmp[0] & 0x0000FFFF; /* Length of res BLOCK */
|
||||
restmp += restmp[0] & 0x0000FFFF; /* Skip to next BLOCK */
|
||||
}
|
||||
return (len << 2); /* bytes used by result list */
|
||||
}
|
||||
|
||||
/*
|
||||
* 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)
|
||||
{
|
||||
u16 opblk[] = { 1, 0, I2O_PARAMS_FIELD_GET, group, 1, field };
|
||||
u8 resblk[8 + buflen]; /* 8 bytes for header */
|
||||
int size;
|
||||
|
||||
if (field == -1) /* whole group */
|
||||
opblk[4] = -1;
|
||||
|
||||
size = i2o_parm_issue(i2o_dev, I2O_CMD_UTIL_PARAMS_GET, opblk,
|
||||
sizeof(opblk), resblk, sizeof(resblk));
|
||||
|
||||
memcpy(buf, resblk + 8, buflen); /* cut off header */
|
||||
|
||||
if (size > buflen)
|
||||
return buflen;
|
||||
|
||||
return size;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
}
|
||||
|
||||
/**
|
||||
* i2o_device_init - Initialize I2O devices
|
||||
*
|
||||
* Registers the I2O device class.
|
||||
*
|
||||
* Returns 0 on success or negative error code on failure.
|
||||
*/
|
||||
int i2o_device_init(void)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = class_register(&i2o_device_class);
|
||||
if (rc)
|
||||
return rc;
|
||||
|
||||
return class_interface_register(&i2o_device_class_interface);
|
||||
};
|
||||
|
||||
/**
|
||||
* i2o_device_exit - I2O devices exit function
|
||||
*
|
||||
* Unregisters the I2O device class.
|
||||
*/
|
||||
void i2o_device_exit(void)
|
||||
{
|
||||
class_interface_register(&i2o_device_class_interface);
|
||||
class_unregister(&i2o_device_class);
|
||||
};
|
||||
|
||||
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);
|
||||
Reference in New Issue
Block a user