[PATCH] IB/ipath: namespace cleanup: replace ips with ipath

[linux-2.6/suspend2-2.6.18.git] / drivers / infiniband / hw / ipath / ipath_diag.c

/*
 * Copyright (c) 2006 QLogic, Inc. All rights reserved.
 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * This file contains support for diagnostic functions.  It is accessed by
 * opening the ipath_diag device, normally minor number 129.  Diagnostic use
 * of the InfiniPath chip may render the chip or board unusable until the
 * driver is unloaded, or in some cases, until the system is rebooted.
 *
 * Accesses to the chip through this interface are not similar to going
 * through the /sys/bus/pci resource mmap interface.
 */

#include <linux/pci.h>
#include <asm/uaccess.h>

#include "ipath_kernel.h"
#include "ipath_layer.h"
#include "ipath_common.h"

int ipath_diag_inuse;
static int diag_set_link;

static int ipath_diag_open(struct inode *in, struct file *fp);
static int ipath_diag_release(struct inode *in, struct file *fp);
static ssize_t ipath_diag_read(struct file *fp, char __user *data,
                               size_t count, loff_t *off);
static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
                                size_t count, loff_t *off);

static struct file_operations diag_file_ops = {
        .owner = THIS_MODULE,
        .write = ipath_diag_write,
        .read = ipath_diag_read,
        .open = ipath_diag_open,
        .release = ipath_diag_release
};

int ipath_diag_add(struct ipath_devdata *dd)
{
        char name[16];

        snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit);

        return ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
                               &diag_file_ops, &dd->diag_cdev,
                               &dd->diag_class_dev);
}

void ipath_diag_remove(struct ipath_devdata *dd)
{
        ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_class_dev);
}

/**
 * ipath_read_umem64 - read a 64-bit quantity from the chip into user space
 * @dd: the infinipath device
 * @uaddr: the location to store the data in user memory
 * @caddr: the source chip address (full pointer, not offset)
 * @count: number of bytes to copy (multiple of 32 bits)
 *
 * This function also localizes all chip memory accesses.
 * The copy should be written such that we read full cacheline packets
 * from the chip.  This is usually used for a single qword
 *
 * NOTE:  This assumes the chip address is 64-bit aligned.
 */
static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr,
                             const void __iomem *caddr, size_t count)
{
        const u64 __iomem *reg_addr = caddr;
        const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
        int ret;

        /* not very efficient, but it works for now */
        if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
                ret = -EINVAL;
                goto bail;
        }
        while (reg_addr < reg_end) {
                u64 data = readq(reg_addr);
                if (copy_to_user(uaddr, &data, sizeof(u64))) {
                        ret = -EFAULT;
                        goto bail;
                }
                reg_addr++;
                uaddr += sizeof(u64);
        }
        ret = 0;
bail:
        return ret;
}

/**
 * ipath_write_umem64 - write a 64-bit quantity to the chip from user space
 * @dd: the infinipath device
 * @caddr: the destination chip address (full pointer, not offset)
 * @uaddr: the source of the data in user memory
 * @count: the number of bytes to copy (multiple of 32 bits)
 *
 * This is usually used for a single qword
 * NOTE:  This assumes the chip address is 64-bit aligned.
 */

static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr,
                              const void __user *uaddr, size_t count)
{
        u64 __iomem *reg_addr = caddr;
        const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
        int ret;

        /* not very efficient, but it works for now */
        if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
                ret = -EINVAL;
                goto bail;
        }
        while (reg_addr < reg_end) {
                u64 data;
                if (copy_from_user(&data, uaddr, sizeof(data))) {
                        ret = -EFAULT;
                        goto bail;
                }
                writeq(data, reg_addr);

                reg_addr++;
                uaddr += sizeof(u64);
        }
        ret = 0;
bail:
        return ret;
}

/**
 * ipath_read_umem32 - read a 32-bit quantity from the chip into user space
 * @dd: the infinipath device
 * @uaddr: the location to store the data in user memory
 * @caddr: the source chip address (full pointer, not offset)
 * @count: number of bytes to copy
 *
 * read 32 bit values, not 64 bit; for memories that only
 * support 32 bit reads; usually a single dword.
 */
static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr,
                             const void __iomem *caddr, size_t count)
{
        const u32 __iomem *reg_addr = caddr;
        const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
        int ret;

        if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
            reg_end > (u32 __iomem *) dd->ipath_kregend) {
                ret = -EINVAL;
                goto bail;
        }
        /* not very efficient, but it works for now */
        while (reg_addr < reg_end) {
                u32 data = readl(reg_addr);
                if (copy_to_user(uaddr, &data, sizeof(data))) {
                        ret = -EFAULT;
                        goto bail;
                }

                reg_addr++;
                uaddr += sizeof(u32);

        }
        ret = 0;
bail:
        return ret;
}

/**
 * ipath_write_umem32 - write a 32-bit quantity to the chip from user space
 * @dd: the infinipath device
 * @caddr: the destination chip address (full pointer, not offset)
 * @uaddr: the source of the data in user memory
 * @count: number of bytes to copy
 *
 * write 32 bit values, not 64 bit; for memories that only
 * support 32 bit write; usually a single dword.
 */

static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr,
                              const void __user *uaddr, size_t count)
{
        u32 __iomem *reg_addr = caddr;
        const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
        int ret;

        if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
            reg_end > (u32 __iomem *) dd->ipath_kregend) {
                ret = -EINVAL;
                goto bail;
        }
        while (reg_addr < reg_end) {
                u32 data;
                if (copy_from_user(&data, uaddr, sizeof(data))) {
                        ret = -EFAULT;
                        goto bail;
                }
                writel(data, reg_addr);

                reg_addr++;
                uaddr += sizeof(u32);
        }
        ret = 0;
bail:
        return ret;
}

static int ipath_diag_open(struct inode *in, struct file *fp)
{
        int unit = iminor(in) - IPATH_DIAG_MINOR_BASE;
        struct ipath_devdata *dd;
        int ret;

        mutex_lock(&ipath_mutex);

        if (ipath_diag_inuse) {
                ret = -EBUSY;
                goto bail;
        }

        dd = ipath_lookup(unit);

        if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) ||
            !dd->ipath_kregbase) {
                ret = -ENODEV;
                goto bail;
        }

        fp->private_data = dd;
        ipath_diag_inuse = 1;
        diag_set_link = 0;
        ret = 0;

        /* Only expose a way to reset the device if we
           make it into diag mode. */
        ipath_expose_reset(&dd->pcidev->dev);

bail:
        mutex_unlock(&ipath_mutex);

        return ret;
}

static int ipath_diag_release(struct inode *in, struct file *fp)
{
        mutex_lock(&ipath_mutex);
        ipath_diag_inuse = 0;
        fp->private_data = NULL;
        mutex_unlock(&ipath_mutex);
        return 0;
}

static ssize_t ipath_diag_read(struct file *fp, char __user *data,
                               size_t count, loff_t *off)
{
        struct ipath_devdata *dd = fp->private_data;
        void __iomem *kreg_base;
        ssize_t ret;

        kreg_base = dd->ipath_kregbase;

        if (count == 0)
                ret = 0;
        else if ((count % 4) || (*off % 4))
                /* address or length is not 32-bit aligned, hence invalid */
                ret = -EINVAL;
        else if ((count % 8) || (*off % 8))
                /* address or length not 64-bit aligned; do 32-bit reads */
                ret = ipath_read_umem32(dd, data, kreg_base + *off, count);
        else
                ret = ipath_read_umem64(dd, data, kreg_base + *off, count);

        if (ret >= 0) {
                *off += count;
                ret = count;
        }

        return ret;
}

static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
                                size_t count, loff_t *off)
{
        struct ipath_devdata *dd = fp->private_data;
        void __iomem *kreg_base;
        ssize_t ret;

        kreg_base = dd->ipath_kregbase;

        if (count == 0)
                ret = 0;
        else if ((count % 4) || (*off % 4))
                /* address or length is not 32-bit aligned, hence invalid */
                ret = -EINVAL;
        else if ((count % 8) || (*off % 8))
                /* address or length not 64-bit aligned; do 32-bit writes */
                ret = ipath_write_umem32(dd, kreg_base + *off, data, count);
        else
                ret = ipath_write_umem64(dd, kreg_base + *off, data, count);

        if (ret >= 0) {
                *off += count;
                ret = count;
        }

        return ret;
}