drivers/infiniband/hw/ipath/ipath_diag.c - kernel/msm - Gitiles

 /*
  * 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_common.h"
 #include "ipath_kernel.h"
 #include "ips_common.h"
 #include "ipath_layer.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
 };

 static struct cdev *diag_cdev;
 static struct class_device *diag_class_dev;

 int ipath_diag_init(void)
 {
 	return ipath_cdev_init(IPATH_DIAG_MINOR, "ipath_diag",
 			       &diag_file_ops, &diag_cdev, &diag_class_dev);
 }

 void ipath_diag_cleanup(void)
 {
 	ipath_cdev_cleanup(&diag_cdev, &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++;
 	}
 	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++;
 	}
 	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++;
 	}
 	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++;
 	}
 	ret = 0;
 bail:
 	return ret;
 }

 static int ipath_diag_open(struct inode *in, struct file *fp)
 {
 	struct ipath_devdata *dd;
 	int unit = 0; /* XXX this is bogus */
 	unsigned long flags;
 	int ret;

 	dd = ipath_lookup(unit);

 	mutex_lock(&ipath_mutex);
 	spin_lock_irqsave(&ipath_devs_lock, flags);

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

 	list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
 		/*
 		 * we need at least one infinipath device to be present
 		 * (don't use INITTED, because we want to be able to open
 		 * even if device is in freeze mode, which cleared INITTED).
 		 * There is a small amount of risk to this, which is why we
 		 * also verify kregbase is set.
 		 */

 		if (!(dd->ipath_flags & IPATH_PRESENT) ||
 		    !dd->ipath_kregbase)
 			continue;

 		ipath_diag_inuse = 1;
 		diag_set_link = 0;
 		ret = 0;
 		goto bail;
 	}

 	ret = -ENODEV;

 bail:
 	spin_unlock_irqrestore(&ipath_devs_lock, flags);
 	mutex_unlock(&ipath_mutex);

 	/* Only expose a way to reset the device if we
 	   make it into diag mode. */
 	if (ret == 0)
 		ipath_expose_reset(&dd->pcidev->dev);

 	return ret;
 }

 static int ipath_diag_release(struct inode *i, struct file *f)
 {
 	mutex_lock(&ipath_mutex);
 	ipath_diag_inuse = 0;
 	mutex_unlock(&ipath_mutex);
 	return 0;
 }

 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
 			       size_t count, loff_t *off)
 {
 	int unit = 0; /* XXX provide for reads on other units some day */
 	struct ipath_devdata *dd;
 	void __iomem *kreg_base;
 	ssize_t ret;

 	dd = ipath_lookup(unit);
 	if (!dd) {
 		ret = -ENODEV;
 		goto bail;
 	}

 	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;
 	}

 bail:
 	return ret;
 }

 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
 				size_t count, loff_t *off)
 {
 	int unit = 0; /* XXX this is bogus */
 	struct ipath_devdata *dd;
 	void __iomem *kreg_base;
 	ssize_t ret;

 	dd = ipath_lookup(unit);
 	if (!dd) {
 		ret = -ENODEV;
 		goto bail;
 	}
 	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;
 	}

 bail:
 	return ret;
 }
	/*
	* 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_common.h"
	#include "ipath_kernel.h"
	#include "ips_common.h"
	#include "ipath_layer.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
	};

	static struct cdev *diag_cdev;
	static struct class_device *diag_class_dev;

	int ipath_diag_init(void)
	{
	return ipath_cdev_init(IPATH_DIAG_MINOR, "ipath_diag",
	&diag_file_ops, &diag_cdev, &diag_class_dev);
	}

	void ipath_diag_cleanup(void)
	{
	ipath_cdev_cleanup(&diag_cdev, &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++;
	}
	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++;
	}
	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++;
	}
	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++;
	}
	ret = 0;
	bail:
	return ret;
	}

	static int ipath_diag_open(struct inode in, struct file fp)
	{
	struct ipath_devdata *dd;
	int unit = 0; /* XXX this is bogus */
	unsigned long flags;
	int ret;

	dd = ipath_lookup(unit);

	mutex_lock(&ipath_mutex);
	spin_lock_irqsave(&ipath_devs_lock, flags);

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

	list_for_each_entry(dd, &ipath_dev_list, ipath_list) {
	/*
	* we need at least one infinipath device to be present
	* (don't use INITTED, because we want to be able to open
	* even if device is in freeze mode, which cleared INITTED).
	* There is a small amount of risk to this, which is why we
	* also verify kregbase is set.
	*/

	if (!(dd->ipath_flags & IPATH_PRESENT) \|\|
	!dd->ipath_kregbase)
	continue;

	ipath_diag_inuse = 1;
	diag_set_link = 0;
	ret = 0;
	goto bail;
	}

	ret = -ENODEV;

	bail:
	spin_unlock_irqrestore(&ipath_devs_lock, flags);
	mutex_unlock(&ipath_mutex);

	/* Only expose a way to reset the device if we
	make it into diag mode. */
	if (ret == 0)
	ipath_expose_reset(&dd->pcidev->dev);

	return ret;
	}

	static int ipath_diag_release(struct inode i, struct file f)
	{
	mutex_lock(&ipath_mutex);
	ipath_diag_inuse = 0;
	mutex_unlock(&ipath_mutex);
	return 0;
	}

	static ssize_t ipath_diag_read(struct file fp, char __user data,
	size_t count, loff_t *off)
	{
	int unit = 0; /* XXX provide for reads on other units some day */
	struct ipath_devdata *dd;
	void __iomem *kreg_base;
	ssize_t ret;

	dd = ipath_lookup(unit);
	if (!dd) {
	ret = -ENODEV;
	goto bail;
	}

	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;
	}

	bail:
	return ret;
	}

	static ssize_t ipath_diag_write(struct file fp, const char __user data,
	size_t count, loff_t *off)
	{
	int unit = 0; /* XXX this is bogus */
	struct ipath_devdata *dd;
	void __iomem *kreg_base;
	ssize_t ret;

	dd = ipath_lookup(unit);
	if (!dd) {
	ret = -ENODEV;
	goto bail;
	}
	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;
	}

	bail:
	return ret;
	}