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097709fe | 1 | /* |
e7eacd36 | 2 | * Copyright (c) 2006, 2007, 2008 QLogic Corporation. All rights reserved. |
097709fe BS |
3 | * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved. |
4 | * | |
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: | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or | |
12 | * without modification, are permitted provided that the following | |
13 | * conditions are met: | |
14 | * | |
15 | * - Redistributions of source code must retain the above | |
16 | * copyright notice, this list of conditions and the following | |
17 | * disclaimer. | |
18 | * | |
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. | |
23 | * | |
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 | |
31 | * SOFTWARE. | |
32 | */ | |
33 | ||
34 | /* | |
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. | |
39 | * | |
40 | * Accesses to the chip through this interface are not similar to going | |
41 | * through the /sys/bus/pci resource mmap interface. | |
42 | */ | |
43 | ||
98341f26 | 44 | #include <linux/io.h> |
097709fe | 45 | #include <linux/pci.h> |
d7b20045 | 46 | #include <linux/vmalloc.h> |
4e950f6f | 47 | #include <linux/fs.h> |
097709fe BS |
48 | #include <asm/uaccess.h> |
49 | ||
097709fe | 50 | #include "ipath_kernel.h" |
27b678dd | 51 | #include "ipath_common.h" |
097709fe BS |
52 | |
53 | int ipath_diag_inuse; | |
54 | static int diag_set_link; | |
55 | ||
56 | static int ipath_diag_open(struct inode *in, struct file *fp); | |
57 | static int ipath_diag_release(struct inode *in, struct file *fp); | |
58 | static ssize_t ipath_diag_read(struct file *fp, char __user *data, | |
59 | size_t count, loff_t *off); | |
60 | static ssize_t ipath_diag_write(struct file *fp, const char __user *data, | |
61 | size_t count, loff_t *off); | |
62 | ||
2b8693c0 | 63 | static const struct file_operations diag_file_ops = { |
097709fe BS |
64 | .owner = THIS_MODULE, |
65 | .write = ipath_diag_write, | |
66 | .read = ipath_diag_read, | |
67 | .open = ipath_diag_open, | |
6038f373 AB |
68 | .release = ipath_diag_release, |
69 | .llseek = default_llseek, | |
097709fe BS |
70 | }; |
71 | ||
6ef93ddd RW |
72 | static ssize_t ipath_diagpkt_write(struct file *fp, |
73 | const char __user *data, | |
74 | size_t count, loff_t *off); | |
75 | ||
2b8693c0 | 76 | static const struct file_operations diagpkt_file_ops = { |
6ef93ddd RW |
77 | .owner = THIS_MODULE, |
78 | .write = ipath_diagpkt_write, | |
6038f373 | 79 | .llseek = noop_llseek, |
6ef93ddd RW |
80 | }; |
81 | ||
82 | static atomic_t diagpkt_count = ATOMIC_INIT(0); | |
83 | static struct cdev *diagpkt_cdev; | |
f4e91eb4 | 84 | static struct device *diagpkt_dev; |
6ef93ddd | 85 | |
a2acb2ff | 86 | int ipath_diag_add(struct ipath_devdata *dd) |
097709fe | 87 | { |
a2acb2ff | 88 | char name[16]; |
6ef93ddd RW |
89 | int ret = 0; |
90 | ||
91 | if (atomic_inc_return(&diagpkt_count) == 1) { | |
92 | ret = ipath_cdev_init(IPATH_DIAGPKT_MINOR, | |
93 | "ipath_diagpkt", &diagpkt_file_ops, | |
f4e91eb4 | 94 | &diagpkt_cdev, &diagpkt_dev); |
6ef93ddd RW |
95 | |
96 | if (ret) { | |
97 | ipath_dev_err(dd, "Couldn't create ipath_diagpkt " | |
98 | "device: %d", ret); | |
99 | goto done; | |
100 | } | |
101 | } | |
a2acb2ff BS |
102 | |
103 | snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit); | |
104 | ||
6ef93ddd RW |
105 | ret = ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name, |
106 | &diag_file_ops, &dd->diag_cdev, | |
f4e91eb4 | 107 | &dd->diag_dev); |
6ef93ddd RW |
108 | if (ret) |
109 | ipath_dev_err(dd, "Couldn't create %s device: %d", | |
110 | name, ret); | |
111 | ||
112 | done: | |
113 | return ret; | |
097709fe BS |
114 | } |
115 | ||
a2acb2ff | 116 | void ipath_diag_remove(struct ipath_devdata *dd) |
097709fe | 117 | { |
6ef93ddd | 118 | if (atomic_dec_and_test(&diagpkt_count)) |
f4e91eb4 | 119 | ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_dev); |
6ef93ddd | 120 | |
f4e91eb4 | 121 | ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_dev); |
097709fe BS |
122 | } |
123 | ||
124 | /** | |
125 | * ipath_read_umem64 - read a 64-bit quantity from the chip into user space | |
126 | * @dd: the infinipath device | |
127 | * @uaddr: the location to store the data in user memory | |
128 | * @caddr: the source chip address (full pointer, not offset) | |
129 | * @count: number of bytes to copy (multiple of 32 bits) | |
130 | * | |
131 | * This function also localizes all chip memory accesses. | |
132 | * The copy should be written such that we read full cacheline packets | |
133 | * from the chip. This is usually used for a single qword | |
134 | * | |
135 | * NOTE: This assumes the chip address is 64-bit aligned. | |
136 | */ | |
137 | static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr, | |
138 | const void __iomem *caddr, size_t count) | |
139 | { | |
140 | const u64 __iomem *reg_addr = caddr; | |
141 | const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64)); | |
142 | int ret; | |
143 | ||
144 | /* not very efficient, but it works for now */ | |
a2acb2ff | 145 | if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) { |
097709fe BS |
146 | ret = -EINVAL; |
147 | goto bail; | |
148 | } | |
149 | while (reg_addr < reg_end) { | |
150 | u64 data = readq(reg_addr); | |
151 | if (copy_to_user(uaddr, &data, sizeof(u64))) { | |
152 | ret = -EFAULT; | |
153 | goto bail; | |
154 | } | |
155 | reg_addr++; | |
6d8e9dd0 | 156 | uaddr += sizeof(u64); |
097709fe BS |
157 | } |
158 | ret = 0; | |
159 | bail: | |
160 | return ret; | |
161 | } | |
162 | ||
163 | /** | |
164 | * ipath_write_umem64 - write a 64-bit quantity to the chip from user space | |
165 | * @dd: the infinipath device | |
166 | * @caddr: the destination chip address (full pointer, not offset) | |
167 | * @uaddr: the source of the data in user memory | |
168 | * @count: the number of bytes to copy (multiple of 32 bits) | |
169 | * | |
170 | * This is usually used for a single qword | |
171 | * NOTE: This assumes the chip address is 64-bit aligned. | |
172 | */ | |
173 | ||
174 | static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr, | |
175 | const void __user *uaddr, size_t count) | |
176 | { | |
177 | u64 __iomem *reg_addr = caddr; | |
178 | const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64)); | |
179 | int ret; | |
180 | ||
181 | /* not very efficient, but it works for now */ | |
a2acb2ff | 182 | if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) { |
097709fe BS |
183 | ret = -EINVAL; |
184 | goto bail; | |
185 | } | |
186 | while (reg_addr < reg_end) { | |
187 | u64 data; | |
188 | if (copy_from_user(&data, uaddr, sizeof(data))) { | |
189 | ret = -EFAULT; | |
190 | goto bail; | |
191 | } | |
192 | writeq(data, reg_addr); | |
193 | ||
194 | reg_addr++; | |
6d8e9dd0 | 195 | uaddr += sizeof(u64); |
097709fe BS |
196 | } |
197 | ret = 0; | |
198 | bail: | |
199 | return ret; | |
200 | } | |
201 | ||
202 | /** | |
203 | * ipath_read_umem32 - read a 32-bit quantity from the chip into user space | |
204 | * @dd: the infinipath device | |
205 | * @uaddr: the location to store the data in user memory | |
206 | * @caddr: the source chip address (full pointer, not offset) | |
207 | * @count: number of bytes to copy | |
208 | * | |
209 | * read 32 bit values, not 64 bit; for memories that only | |
210 | * support 32 bit reads; usually a single dword. | |
211 | */ | |
212 | static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr, | |
213 | const void __iomem *caddr, size_t count) | |
214 | { | |
215 | const 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 | /* not very efficient, but it works for now */ | |
225 | while (reg_addr < reg_end) { | |
226 | u32 data = readl(reg_addr); | |
227 | if (copy_to_user(uaddr, &data, sizeof(data))) { | |
228 | ret = -EFAULT; | |
229 | goto bail; | |
230 | } | |
231 | ||
232 | reg_addr++; | |
6d8e9dd0 BS |
233 | uaddr += sizeof(u32); |
234 | ||
097709fe BS |
235 | } |
236 | ret = 0; | |
237 | bail: | |
238 | return ret; | |
239 | } | |
240 | ||
241 | /** | |
242 | * ipath_write_umem32 - write a 32-bit quantity to the chip from user space | |
243 | * @dd: the infinipath device | |
244 | * @caddr: the destination chip address (full pointer, not offset) | |
245 | * @uaddr: the source of the data in user memory | |
246 | * @count: number of bytes to copy | |
247 | * | |
248 | * write 32 bit values, not 64 bit; for memories that only | |
249 | * support 32 bit write; usually a single dword. | |
250 | */ | |
251 | ||
252 | static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr, | |
253 | const void __user *uaddr, size_t count) | |
254 | { | |
255 | u32 __iomem *reg_addr = caddr; | |
256 | const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32)); | |
257 | int ret; | |
258 | ||
259 | if (reg_addr < (u32 __iomem *) dd->ipath_kregbase || | |
260 | reg_end > (u32 __iomem *) dd->ipath_kregend) { | |
261 | ret = -EINVAL; | |
262 | goto bail; | |
263 | } | |
264 | while (reg_addr < reg_end) { | |
265 | u32 data; | |
266 | if (copy_from_user(&data, uaddr, sizeof(data))) { | |
267 | ret = -EFAULT; | |
268 | goto bail; | |
269 | } | |
270 | writel(data, reg_addr); | |
271 | ||
272 | reg_addr++; | |
6d8e9dd0 | 273 | uaddr += sizeof(u32); |
097709fe BS |
274 | } |
275 | ret = 0; | |
276 | bail: | |
277 | return ret; | |
278 | } | |
279 | ||
280 | static int ipath_diag_open(struct inode *in, struct file *fp) | |
281 | { | |
a2acb2ff | 282 | int unit = iminor(in) - IPATH_DIAG_MINOR_BASE; |
097709fe | 283 | struct ipath_devdata *dd; |
097709fe BS |
284 | int ret; |
285 | ||
097709fe | 286 | mutex_lock(&ipath_mutex); |
097709fe BS |
287 | |
288 | if (ipath_diag_inuse) { | |
289 | ret = -EBUSY; | |
290 | goto bail; | |
291 | } | |
292 | ||
a2acb2ff BS |
293 | dd = ipath_lookup(unit); |
294 | ||
295 | if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) || | |
296 | !dd->ipath_kregbase) { | |
297 | ret = -ENODEV; | |
097709fe BS |
298 | goto bail; |
299 | } | |
300 | ||
a2acb2ff | 301 | fp->private_data = dd; |
490462c2 | 302 | ipath_diag_inuse = -2; |
a2acb2ff BS |
303 | diag_set_link = 0; |
304 | ret = 0; | |
097709fe BS |
305 | |
306 | /* Only expose a way to reset the device if we | |
307 | make it into diag mode. */ | |
a2acb2ff | 308 | ipath_expose_reset(&dd->pcidev->dev); |
097709fe | 309 | |
a2acb2ff | 310 | bail: |
755e4ca4 BS |
311 | mutex_unlock(&ipath_mutex); |
312 | ||
097709fe BS |
313 | return ret; |
314 | } | |
315 | ||
98341f26 BS |
316 | /** |
317 | * ipath_diagpkt_write - write an IB packet | |
318 | * @fp: the diag data device file pointer | |
319 | * @data: ipath_diag_pkt structure saying where to get the packet | |
320 | * @count: size of data to write | |
321 | * @off: unused by this code | |
322 | */ | |
323 | static ssize_t ipath_diagpkt_write(struct file *fp, | |
324 | const char __user *data, | |
325 | size_t count, loff_t *off) | |
326 | { | |
327 | u32 __iomem *piobuf; | |
328 | u32 plen, clen, pbufn; | |
e8e7ad71 MA |
329 | struct ipath_diag_pkt odp; |
330 | struct ipath_diag_xpkt dp; | |
98341f26 BS |
331 | u32 *tmpbuf = NULL; |
332 | struct ipath_devdata *dd; | |
333 | ssize_t ret = 0; | |
334 | u64 val; | |
58411d1c | 335 | u32 l_state, lt_state; /* LinkState, LinkTrainingState */ |
98341f26 | 336 | |
afd9970f | 337 | if (count < sizeof(odp)) { |
98341f26 BS |
338 | ret = -EINVAL; |
339 | goto bail; | |
340 | } | |
341 | ||
afd9970f MA |
342 | if (count == sizeof(dp)) { |
343 | if (copy_from_user(&dp, data, sizeof(dp))) { | |
344 | ret = -EFAULT; | |
345 | goto bail; | |
346 | } | |
347 | } else if (copy_from_user(&odp, data, sizeof(odp))) { | |
98341f26 BS |
348 | ret = -EFAULT; |
349 | goto bail; | |
350 | } | |
351 | ||
e8e7ad71 MA |
352 | /* |
353 | * Due to padding/alignment issues (lessened with new struct) | |
354 | * the old and new structs are the same length. We need to | |
355 | * disambiguate them, which we can do because odp.len has never | |
356 | * been less than the total of LRH+BTH+DETH so far, while | |
357 | * dp.unit (same offset) unit is unlikely to get that high. | |
358 | * Similarly, dp.data, the pointer to user at the same offset | |
359 | * as odp.unit, is almost certainly at least one (512byte)page | |
360 | * "above" NULL. The if-block below can be omitted if compatibility | |
361 | * between a new driver and older diagnostic code is unimportant. | |
362 | * compatibility the other direction (new diags, old driver) is | |
363 | * handled in the diagnostic code, with a warning. | |
364 | */ | |
365 | if (dp.unit >= 20 && dp.data < 512) { | |
366 | /* very probable version mismatch. Fix it up */ | |
367 | memcpy(&odp, &dp, sizeof(odp)); | |
368 | /* We got a legacy dp, copy elements to dp */ | |
369 | dp.unit = odp.unit; | |
370 | dp.data = odp.data; | |
371 | dp.len = odp.len; | |
372 | dp.pbc_wd = 0; /* Indicate we need to compute PBC wd */ | |
373 | } | |
374 | ||
98341f26 BS |
375 | /* send count must be an exact number of dwords */ |
376 | if (dp.len & 3) { | |
377 | ret = -EINVAL; | |
378 | goto bail; | |
379 | } | |
380 | ||
381 | clen = dp.len >> 2; | |
382 | ||
383 | dd = ipath_lookup(dp.unit); | |
384 | if (!dd || !(dd->ipath_flags & IPATH_PRESENT) || | |
385 | !dd->ipath_kregbase) { | |
386 | ipath_cdbg(VERBOSE, "illegal unit %u for diag data send\n", | |
387 | dp.unit); | |
388 | ret = -ENODEV; | |
389 | goto bail; | |
390 | } | |
391 | ||
392 | if (ipath_diag_inuse && !diag_set_link && | |
393 | !(dd->ipath_flags & IPATH_LINKACTIVE)) { | |
394 | diag_set_link = 1; | |
395 | ipath_cdbg(VERBOSE, "Trying to set to set link active for " | |
396 | "diag pkt\n"); | |
397 | ipath_set_linkstate(dd, IPATH_IB_LINKARM); | |
398 | ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE); | |
399 | } | |
400 | ||
401 | if (!(dd->ipath_flags & IPATH_INITTED)) { | |
402 | /* no hardware, freeze, etc. */ | |
403 | ipath_cdbg(VERBOSE, "unit %u not usable\n", dd->ipath_unit); | |
404 | ret = -ENODEV; | |
405 | goto bail; | |
406 | } | |
58411d1c JG |
407 | /* |
408 | * Want to skip check for l_state if using custom PBC, | |
409 | * because we might be trying to force an SM packet out. | |
410 | * first-cut, skip _all_ state checking in that case. | |
411 | */ | |
412 | val = ipath_ib_state(dd, dd->ipath_lastibcstat); | |
413 | lt_state = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat); | |
414 | l_state = ipath_ib_linkstate(dd, dd->ipath_lastibcstat); | |
415 | if (!dp.pbc_wd && (lt_state != INFINIPATH_IBCS_LT_STATE_LINKUP || | |
416 | (val != dd->ib_init && val != dd->ib_arm && | |
417 | val != dd->ib_active))) { | |
98341f26 BS |
418 | ipath_cdbg(VERBOSE, "unit %u not ready (state %llx)\n", |
419 | dd->ipath_unit, (unsigned long long) val); | |
420 | ret = -EINVAL; | |
421 | goto bail; | |
422 | } | |
423 | ||
424 | /* need total length before first word written */ | |
425 | /* +1 word is for the qword padding */ | |
426 | plen = sizeof(u32) + dp.len; | |
427 | ||
428 | if ((plen + 4) > dd->ipath_ibmaxlen) { | |
429 | ipath_dbg("Pkt len 0x%x > ibmaxlen %x\n", | |
430 | plen - 4, dd->ipath_ibmaxlen); | |
431 | ret = -EINVAL; | |
432 | goto bail; /* before writing pbc */ | |
433 | } | |
434 | tmpbuf = vmalloc(plen); | |
435 | if (!tmpbuf) { | |
436 | dev_info(&dd->pcidev->dev, "Unable to allocate tmp buffer, " | |
437 | "failing\n"); | |
438 | ret = -ENOMEM; | |
439 | goto bail; | |
440 | } | |
441 | ||
442 | if (copy_from_user(tmpbuf, | |
443 | (const void __user *) (unsigned long) dp.data, | |
444 | dp.len)) { | |
445 | ret = -EFAULT; | |
446 | goto bail; | |
447 | } | |
448 | ||
c4b4d16e RC |
449 | plen >>= 2; /* in dwords */ |
450 | ||
451 | piobuf = ipath_getpiobuf(dd, plen, &pbufn); | |
98341f26 BS |
452 | if (!piobuf) { |
453 | ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n", | |
454 | dd->ipath_unit); | |
455 | ret = -EBUSY; | |
456 | goto bail; | |
457 | } | |
58411d1c JG |
458 | /* disarm it just to be extra sure */ |
459 | ipath_disarm_piobufs(dd, pbufn, 1); | |
98341f26 | 460 | |
98341f26 BS |
461 | if (ipath_debug & __IPATH_PKTDBG) |
462 | ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n", | |
463 | dd->ipath_unit, plen - 1, pbufn); | |
464 | ||
e8e7ad71 | 465 | if (dp.pbc_wd == 0) |
e8e7ad71 | 466 | dp.pbc_wd = plen; |
e8e7ad71 | 467 | writeq(dp.pbc_wd, piobuf); |
210d6ca3 RC |
468 | /* |
469 | * Copy all by the trigger word, then flush, so it's written | |
98341f26 | 470 | * to chip before trigger word, then write trigger word, then |
210d6ca3 RC |
471 | * flush again, so packet is sent. |
472 | */ | |
473 | if (dd->ipath_flags & IPATH_PIO_FLUSH_WC) { | |
474 | ipath_flush_wc(); | |
475 | __iowrite32_copy(piobuf + 2, tmpbuf, clen - 1); | |
476 | ipath_flush_wc(); | |
477 | __raw_writel(tmpbuf[clen - 1], piobuf + clen + 1); | |
478 | } else | |
479 | __iowrite32_copy(piobuf + 2, tmpbuf, clen); | |
480 | ||
98341f26 BS |
481 | ipath_flush_wc(); |
482 | ||
483 | ret = sizeof(dp); | |
484 | ||
485 | bail: | |
486 | vfree(tmpbuf); | |
487 | return ret; | |
488 | } | |
489 | ||
a2acb2ff | 490 | static int ipath_diag_release(struct inode *in, struct file *fp) |
097709fe BS |
491 | { |
492 | mutex_lock(&ipath_mutex); | |
493 | ipath_diag_inuse = 0; | |
a2acb2ff | 494 | fp->private_data = NULL; |
097709fe BS |
495 | mutex_unlock(&ipath_mutex); |
496 | return 0; | |
497 | } | |
498 | ||
499 | static ssize_t ipath_diag_read(struct file *fp, char __user *data, | |
500 | size_t count, loff_t *off) | |
501 | { | |
a2acb2ff | 502 | struct ipath_devdata *dd = fp->private_data; |
097709fe BS |
503 | void __iomem *kreg_base; |
504 | ssize_t ret; | |
505 | ||
097709fe BS |
506 | kreg_base = dd->ipath_kregbase; |
507 | ||
508 | if (count == 0) | |
509 | ret = 0; | |
510 | else if ((count % 4) || (*off % 4)) | |
511 | /* address or length is not 32-bit aligned, hence invalid */ | |
512 | ret = -EINVAL; | |
490462c2 BS |
513 | else if (ipath_diag_inuse < 1 && (*off || count != 8)) |
514 | ret = -EINVAL; /* prevent cat /dev/ipath_diag* */ | |
097709fe BS |
515 | else if ((count % 8) || (*off % 8)) |
516 | /* address or length not 64-bit aligned; do 32-bit reads */ | |
517 | ret = ipath_read_umem32(dd, data, kreg_base + *off, count); | |
518 | else | |
519 | ret = ipath_read_umem64(dd, data, kreg_base + *off, count); | |
520 | ||
521 | if (ret >= 0) { | |
522 | *off += count; | |
523 | ret = count; | |
490462c2 BS |
524 | if (ipath_diag_inuse == -2) |
525 | ipath_diag_inuse++; | |
097709fe BS |
526 | } |
527 | ||
097709fe BS |
528 | return ret; |
529 | } | |
530 | ||
531 | static ssize_t ipath_diag_write(struct file *fp, const char __user *data, | |
532 | size_t count, loff_t *off) | |
533 | { | |
a2acb2ff | 534 | struct ipath_devdata *dd = fp->private_data; |
097709fe BS |
535 | void __iomem *kreg_base; |
536 | ssize_t ret; | |
537 | ||
097709fe BS |
538 | kreg_base = dd->ipath_kregbase; |
539 | ||
540 | if (count == 0) | |
541 | ret = 0; | |
542 | else if ((count % 4) || (*off % 4)) | |
543 | /* address or length is not 32-bit aligned, hence invalid */ | |
544 | ret = -EINVAL; | |
490462c2 BS |
545 | else if ((ipath_diag_inuse == -1 && (*off || count != 8)) || |
546 | ipath_diag_inuse == -2) /* read qw off 0, write qw off 0 */ | |
547 | ret = -EINVAL; /* before any other write allowed */ | |
097709fe BS |
548 | else if ((count % 8) || (*off % 8)) |
549 | /* address or length not 64-bit aligned; do 32-bit writes */ | |
550 | ret = ipath_write_umem32(dd, kreg_base + *off, data, count); | |
551 | else | |
552 | ret = ipath_write_umem64(dd, kreg_base + *off, data, count); | |
553 | ||
554 | if (ret >= 0) { | |
555 | *off += count; | |
556 | ret = count; | |
490462c2 BS |
557 | if (ipath_diag_inuse == -1) |
558 | ipath_diag_inuse = 1; /* all read/write OK now */ | |
097709fe BS |
559 | } |
560 | ||
097709fe BS |
561 | return ret; |
562 | } |