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1 | /* |
2 | * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
33 | /* | |
34 | * This file contains support for diagnostic functions. It is accessed by | |
35 | * opening the ipath_diag device, normally minor number 129. Diagnostic use | |
36 | * of the InfiniPath chip may render the chip or board unusable until the | |
37 | * driver is unloaded, or in some cases, until the system is rebooted. | |
38 | * | |
39 | * Accesses to the chip through this interface are not similar to going | |
40 | * through the /sys/bus/pci resource mmap interface. | |
41 | */ | |
42 | ||
43 | #include <linux/pci.h> | |
44 | #include <asm/uaccess.h> | |
45 | ||
46 | #include "ipath_common.h" | |
47 | #include "ipath_kernel.h" | |
48 | #include "ips_common.h" | |
49 | #include "ipath_layer.h" | |
50 | ||
51 | int ipath_diag_inuse; | |
52 | static int diag_set_link; | |
53 | ||
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); | |
60 | ||
61 | static struct file_operations diag_file_ops = { | |
62 | .owner = THIS_MODULE, | |
63 | .write = ipath_diag_write, | |
64 | .read = ipath_diag_read, | |
65 | .open = ipath_diag_open, | |
66 | .release = ipath_diag_release | |
67 | }; | |
68 | ||
69 | static struct cdev *diag_cdev; | |
70 | static struct class_device *diag_class_dev; | |
71 | ||
72 | int ipath_diag_init(void) | |
73 | { | |
74 | return ipath_cdev_init(IPATH_DIAG_MINOR, "ipath_diag", | |
75 | &diag_file_ops, &diag_cdev, &diag_class_dev); | |
76 | } | |
77 | ||
78 | void ipath_diag_cleanup(void) | |
79 | { | |
80 | ipath_cdev_cleanup(&diag_cdev, &diag_class_dev); | |
81 | } | |
82 | ||
83 | /** | |
84 | * ipath_read_umem64 - read a 64-bit quantity from the chip into user space | |
85 | * @dd: the infinipath device | |
86 | * @uaddr: the location to store the data in user memory | |
87 | * @caddr: the source chip address (full pointer, not offset) | |
88 | * @count: number of bytes to copy (multiple of 32 bits) | |
89 | * | |
90 | * This function also localizes all chip memory accesses. | |
91 | * The copy should be written such that we read full cacheline packets | |
92 | * from the chip. This is usually used for a single qword | |
93 | * | |
94 | * NOTE: This assumes the chip address is 64-bit aligned. | |
95 | */ | |
96 | static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr, | |
97 | const void __iomem *caddr, size_t count) | |
98 | { | |
99 | const u64 __iomem *reg_addr = caddr; | |
100 | const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64)); | |
101 | int ret; | |
102 | ||
103 | /* not very efficient, but it works for now */ | |
104 | if (reg_addr < dd->ipath_kregbase || | |
105 | reg_end > dd->ipath_kregend) { | |
106 | ret = -EINVAL; | |
107 | goto bail; | |
108 | } | |
109 | while (reg_addr < reg_end) { | |
110 | u64 data = readq(reg_addr); | |
111 | if (copy_to_user(uaddr, &data, sizeof(u64))) { | |
112 | ret = -EFAULT; | |
113 | goto bail; | |
114 | } | |
115 | reg_addr++; | |
116 | uaddr++; | |
117 | } | |
118 | ret = 0; | |
119 | bail: | |
120 | return ret; | |
121 | } | |
122 | ||
123 | /** | |
124 | * ipath_write_umem64 - write a 64-bit quantity to the chip from user space | |
125 | * @dd: the infinipath device | |
126 | * @caddr: the destination chip address (full pointer, not offset) | |
127 | * @uaddr: the source of the data in user memory | |
128 | * @count: the number of bytes to copy (multiple of 32 bits) | |
129 | * | |
130 | * This is usually used for a single qword | |
131 | * NOTE: This assumes the chip address is 64-bit aligned. | |
132 | */ | |
133 | ||
134 | static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr, | |
135 | const void __user *uaddr, size_t count) | |
136 | { | |
137 | u64 __iomem *reg_addr = caddr; | |
138 | const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64)); | |
139 | int ret; | |
140 | ||
141 | /* not very efficient, but it works for now */ | |
142 | if (reg_addr < dd->ipath_kregbase || | |
143 | reg_end > dd->ipath_kregend) { | |
144 | ret = -EINVAL; | |
145 | goto bail; | |
146 | } | |
147 | while (reg_addr < reg_end) { | |
148 | u64 data; | |
149 | if (copy_from_user(&data, uaddr, sizeof(data))) { | |
150 | ret = -EFAULT; | |
151 | goto bail; | |
152 | } | |
153 | writeq(data, reg_addr); | |
154 | ||
155 | reg_addr++; | |
156 | uaddr++; | |
157 | } | |
158 | ret = 0; | |
159 | bail: | |
160 | return ret; | |
161 | } | |
162 | ||
163 | /** | |
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 | |
169 | * | |
170 | * read 32 bit values, not 64 bit; for memories that only | |
171 | * support 32 bit reads; usually a single dword. | |
172 | */ | |
173 | static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr, | |
174 | const void __iomem *caddr, size_t count) | |
175 | { | |
176 | const u32 __iomem *reg_addr = caddr; | |
177 | const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32)); | |
178 | int ret; | |
179 | ||
180 | if (reg_addr < (u32 __iomem *) dd->ipath_kregbase || | |
181 | reg_end > (u32 __iomem *) dd->ipath_kregend) { | |
182 | ret = -EINVAL; | |
183 | goto bail; | |
184 | } | |
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))) { | |
189 | ret = -EFAULT; | |
190 | goto bail; | |
191 | } | |
192 | ||
193 | reg_addr++; | |
194 | uaddr++; | |
195 | } | |
196 | ret = 0; | |
197 | bail: | |
198 | return ret; | |
199 | } | |
200 | ||
201 | /** | |
202 | * ipath_write_umem32 - write a 32-bit quantity to the chip from user space | |
203 | * @dd: the infinipath device | |
204 | * @caddr: the destination chip address (full pointer, not offset) | |
205 | * @uaddr: the source of the data in user memory | |
206 | * @count: number of bytes to copy | |
207 | * | |
208 | * write 32 bit values, not 64 bit; for memories that only | |
209 | * support 32 bit write; usually a single dword. | |
210 | */ | |
211 | ||
212 | static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr, | |
213 | const void __user *uaddr, size_t count) | |
214 | { | |
215 | u32 __iomem *reg_addr = caddr; | |
216 | const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32)); | |
217 | int ret; | |
218 | ||
219 | if (reg_addr < (u32 __iomem *) dd->ipath_kregbase || | |
220 | reg_end > (u32 __iomem *) dd->ipath_kregend) { | |
221 | ret = -EINVAL; | |
222 | goto bail; | |
223 | } | |
224 | while (reg_addr < reg_end) { | |
225 | u32 data; | |
226 | if (copy_from_user(&data, uaddr, sizeof(data))) { | |
227 | ret = -EFAULT; | |
228 | goto bail; | |
229 | } | |
230 | writel(data, reg_addr); | |
231 | ||
232 | reg_addr++; | |
233 | uaddr++; | |
234 | } | |
235 | ret = 0; | |
236 | bail: | |
237 | return ret; | |
238 | } | |
239 | ||
240 | static int ipath_diag_open(struct inode *in, struct file *fp) | |
241 | { | |
242 | struct ipath_devdata *dd; | |
243 | int unit = 0; /* XXX this is bogus */ | |
244 | unsigned long flags; | |
245 | int ret; | |
246 | ||
247 | dd = ipath_lookup(unit); | |
248 | ||
249 | mutex_lock(&ipath_mutex); | |
250 | spin_lock_irqsave(&ipath_devs_lock, flags); | |
251 | ||
252 | if (ipath_diag_inuse) { | |
253 | ret = -EBUSY; | |
254 | goto bail; | |
255 | } | |
256 | ||
257 | list_for_each_entry(dd, &ipath_dev_list, ipath_list) { | |
258 | /* | |
259 | * we need at least one infinipath device to be present | |
260 | * (don't use INITTED, because we want to be able to open | |
261 | * even if device is in freeze mode, which cleared INITTED). | |
262 | * There is a small amount of risk to this, which is why we | |
263 | * also verify kregbase is set. | |
264 | */ | |
265 | ||
266 | if (!(dd->ipath_flags & IPATH_PRESENT) || | |
267 | !dd->ipath_kregbase) | |
268 | continue; | |
269 | ||
270 | ipath_diag_inuse = 1; | |
271 | diag_set_link = 0; | |
272 | ret = 0; | |
273 | goto bail; | |
274 | } | |
275 | ||
276 | ret = -ENODEV; | |
277 | ||
278 | bail: | |
279 | spin_unlock_irqrestore(&ipath_devs_lock, flags); | |
280 | mutex_unlock(&ipath_mutex); | |
281 | ||
282 | /* Only expose a way to reset the device if we | |
283 | make it into diag mode. */ | |
284 | if (ret == 0) | |
285 | ipath_expose_reset(&dd->pcidev->dev); | |
286 | ||
287 | return ret; | |
288 | } | |
289 | ||
290 | static int ipath_diag_release(struct inode *i, struct file *f) | |
291 | { | |
292 | mutex_lock(&ipath_mutex); | |
293 | ipath_diag_inuse = 0; | |
294 | mutex_unlock(&ipath_mutex); | |
295 | return 0; | |
296 | } | |
297 | ||
298 | static ssize_t ipath_diag_read(struct file *fp, char __user *data, | |
299 | size_t count, loff_t *off) | |
300 | { | |
301 | int unit = 0; /* XXX provide for reads on other units some day */ | |
302 | struct ipath_devdata *dd; | |
303 | void __iomem *kreg_base; | |
304 | ssize_t ret; | |
305 | ||
306 | dd = ipath_lookup(unit); | |
307 | if (!dd) { | |
308 | ret = -ENODEV; | |
309 | goto bail; | |
310 | } | |
311 | ||
312 | kreg_base = dd->ipath_kregbase; | |
313 | ||
314 | if (count == 0) | |
315 | ret = 0; | |
316 | else if ((count % 4) || (*off % 4)) | |
317 | /* address or length is not 32-bit aligned, hence invalid */ | |
318 | ret = -EINVAL; | |
319 | else if ((count % 8) || (*off % 8)) | |
320 | /* address or length not 64-bit aligned; do 32-bit reads */ | |
321 | ret = ipath_read_umem32(dd, data, kreg_base + *off, count); | |
322 | else | |
323 | ret = ipath_read_umem64(dd, data, kreg_base + *off, count); | |
324 | ||
325 | if (ret >= 0) { | |
326 | *off += count; | |
327 | ret = count; | |
328 | } | |
329 | ||
330 | bail: | |
331 | return ret; | |
332 | } | |
333 | ||
334 | static ssize_t ipath_diag_write(struct file *fp, const char __user *data, | |
335 | size_t count, loff_t *off) | |
336 | { | |
337 | int unit = 0; /* XXX this is bogus */ | |
338 | struct ipath_devdata *dd; | |
339 | void __iomem *kreg_base; | |
340 | ssize_t ret; | |
341 | ||
342 | dd = ipath_lookup(unit); | |
343 | if (!dd) { | |
344 | ret = -ENODEV; | |
345 | goto bail; | |
346 | } | |
347 | kreg_base = dd->ipath_kregbase; | |
348 | ||
349 | if (count == 0) | |
350 | ret = 0; | |
351 | else if ((count % 4) || (*off % 4)) | |
352 | /* address or length is not 32-bit aligned, hence invalid */ | |
353 | ret = -EINVAL; | |
354 | else if ((count % 8) || (*off % 8)) | |
355 | /* address or length not 64-bit aligned; do 32-bit writes */ | |
356 | ret = ipath_write_umem32(dd, kreg_base + *off, data, count); | |
357 | else | |
358 | ret = ipath_write_umem64(dd, kreg_base + *off, data, count); | |
359 | ||
360 | if (ret >= 0) { | |
361 | *off += count; | |
362 | ret = count; | |
363 | } | |
364 | ||
365 | bail: | |
366 | return ret; | |
367 | } |