2 * Copyright (c) 2006 QLogic, Inc. All rights reserved.
3 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
5 * This software is available to you under a choice of one of two
6 * licenses. You may choose to be licensed under the terms of the GNU
7 * General Public License (GPL) Version 2, available from the file
8 * COPYING in the main directory of this source tree, or the
9 * OpenIB.org BSD license below:
11 * Redistribution and use in source and binary forms, with or
12 * without modification, are permitted provided that the following
15 * - Redistributions of source code must retain the above
16 * copyright notice, this list of conditions and the following
19 * - Redistributions in binary form must reproduce the above
20 * copyright notice, this list of conditions and the following
21 * disclaimer in the documentation and/or other materials
22 * provided with the distribution.
24 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
28 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
29 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
30 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
35 * This file contains support for diagnostic functions. It is accessed by
36 * opening the ipath_diag device, normally minor number 129. Diagnostic use
37 * of the InfiniPath chip may render the chip or board unusable until the
38 * driver is unloaded, or in some cases, until the system is rebooted.
40 * Accesses to the chip through this interface are not similar to going
41 * through the /sys/bus/pci resource mmap interface.
44 #include <linux/pci.h>
45 #include <asm/uaccess.h>
47 #include "ipath_kernel.h"
48 #include "ipath_layer.h"
49 #include "ipath_common.h"
52 static int diag_set_link;
54 static int ipath_diag_open(struct inode *in, struct file *fp);
55 static int ipath_diag_release(struct inode *in, struct file *fp);
56 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
57 size_t count, loff_t *off);
58 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
59 size_t count, loff_t *off);
61 static struct file_operations diag_file_ops = {
63 .write = ipath_diag_write,
64 .read = ipath_diag_read,
65 .open = ipath_diag_open,
66 .release = ipath_diag_release
69 int ipath_diag_add(struct ipath_devdata *dd)
73 snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit);
75 return ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name,
76 &diag_file_ops, &dd->diag_cdev,
80 void ipath_diag_remove(struct ipath_devdata *dd)
82 ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_class_dev);
86 * ipath_read_umem64 - read a 64-bit quantity from the chip into user space
87 * @dd: the infinipath device
88 * @uaddr: the location to store the data in user memory
89 * @caddr: the source chip address (full pointer, not offset)
90 * @count: number of bytes to copy (multiple of 32 bits)
92 * This function also localizes all chip memory accesses.
93 * The copy should be written such that we read full cacheline packets
94 * from the chip. This is usually used for a single qword
96 * NOTE: This assumes the chip address is 64-bit aligned.
98 static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr,
99 const void __iomem *caddr, size_t count)
101 const u64 __iomem *reg_addr = caddr;
102 const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
105 /* not very efficient, but it works for now */
106 if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
110 while (reg_addr < reg_end) {
111 u64 data = readq(reg_addr);
112 if (copy_to_user(uaddr, &data, sizeof(u64))) {
117 uaddr += sizeof(u64);
125 * ipath_write_umem64 - write a 64-bit quantity to the chip from user space
126 * @dd: the infinipath device
127 * @caddr: the destination chip address (full pointer, not offset)
128 * @uaddr: the source of the data in user memory
129 * @count: the number of bytes to copy (multiple of 32 bits)
131 * This is usually used for a single qword
132 * NOTE: This assumes the chip address is 64-bit aligned.
135 static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr,
136 const void __user *uaddr, size_t count)
138 u64 __iomem *reg_addr = caddr;
139 const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64));
142 /* not very efficient, but it works for now */
143 if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) {
147 while (reg_addr < reg_end) {
149 if (copy_from_user(&data, uaddr, sizeof(data))) {
153 writeq(data, reg_addr);
156 uaddr += sizeof(u64);
164 * ipath_read_umem32 - read a 32-bit quantity from the chip into user space
165 * @dd: the infinipath device
166 * @uaddr: the location to store the data in user memory
167 * @caddr: the source chip address (full pointer, not offset)
168 * @count: number of bytes to copy
170 * read 32 bit values, not 64 bit; for memories that only
171 * support 32 bit reads; usually a single dword.
173 static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr,
174 const void __iomem *caddr, size_t count)
176 const u32 __iomem *reg_addr = caddr;
177 const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
180 if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
181 reg_end > (u32 __iomem *) dd->ipath_kregend) {
185 /* not very efficient, but it works for now */
186 while (reg_addr < reg_end) {
187 u32 data = readl(reg_addr);
188 if (copy_to_user(uaddr, &data, sizeof(data))) {
194 uaddr += sizeof(u32);
203 * ipath_write_umem32 - write a 32-bit quantity to the chip from user space
204 * @dd: the infinipath device
205 * @caddr: the destination chip address (full pointer, not offset)
206 * @uaddr: the source of the data in user memory
207 * @count: number of bytes to copy
209 * write 32 bit values, not 64 bit; for memories that only
210 * support 32 bit write; usually a single dword.
213 static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr,
214 const void __user *uaddr, size_t count)
216 u32 __iomem *reg_addr = caddr;
217 const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32));
220 if (reg_addr < (u32 __iomem *) dd->ipath_kregbase ||
221 reg_end > (u32 __iomem *) dd->ipath_kregend) {
225 while (reg_addr < reg_end) {
227 if (copy_from_user(&data, uaddr, sizeof(data))) {
231 writel(data, reg_addr);
234 uaddr += sizeof(u32);
241 static int ipath_diag_open(struct inode *in, struct file *fp)
243 int unit = iminor(in) - IPATH_DIAG_MINOR_BASE;
244 struct ipath_devdata *dd;
247 mutex_lock(&ipath_mutex);
249 if (ipath_diag_inuse) {
254 dd = ipath_lookup(unit);
256 if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) ||
257 !dd->ipath_kregbase) {
262 fp->private_data = dd;
263 ipath_diag_inuse = 1;
267 /* Only expose a way to reset the device if we
268 make it into diag mode. */
269 ipath_expose_reset(&dd->pcidev->dev);
272 mutex_unlock(&ipath_mutex);
277 static int ipath_diag_release(struct inode *in, struct file *fp)
279 mutex_lock(&ipath_mutex);
280 ipath_diag_inuse = 0;
281 fp->private_data = NULL;
282 mutex_unlock(&ipath_mutex);
286 static ssize_t ipath_diag_read(struct file *fp, char __user *data,
287 size_t count, loff_t *off)
289 struct ipath_devdata *dd = fp->private_data;
290 void __iomem *kreg_base;
293 kreg_base = dd->ipath_kregbase;
297 else if ((count % 4) || (*off % 4))
298 /* address or length is not 32-bit aligned, hence invalid */
300 else if ((count % 8) || (*off % 8))
301 /* address or length not 64-bit aligned; do 32-bit reads */
302 ret = ipath_read_umem32(dd, data, kreg_base + *off, count);
304 ret = ipath_read_umem64(dd, data, kreg_base + *off, count);
314 static ssize_t ipath_diag_write(struct file *fp, const char __user *data,
315 size_t count, loff_t *off)
317 struct ipath_devdata *dd = fp->private_data;
318 void __iomem *kreg_base;
321 kreg_base = dd->ipath_kregbase;
325 else if ((count % 4) || (*off % 4))
326 /* address or length is not 32-bit aligned, hence invalid */
328 else if ((count % 8) || (*off % 8))
329 /* address or length not 64-bit aligned; do 32-bit writes */
330 ret = ipath_write_umem32(dd, kreg_base + *off, data, count);
332 ret = ipath_write_umem64(dd, kreg_base + *off, data, count);