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097709fe | 1 | /* |
87427da5 | 2 | * Copyright (c) 2006, 2007 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, | |
68 | .release = ipath_diag_release | |
69 | }; | |
70 | ||
6ef93ddd RW |
71 | static ssize_t ipath_diagpkt_write(struct file *fp, |
72 | const char __user *data, | |
73 | size_t count, loff_t *off); | |
74 | ||
2b8693c0 | 75 | static const struct file_operations diagpkt_file_ops = { |
6ef93ddd RW |
76 | .owner = THIS_MODULE, |
77 | .write = ipath_diagpkt_write, | |
78 | }; | |
79 | ||
80 | static atomic_t diagpkt_count = ATOMIC_INIT(0); | |
81 | static struct cdev *diagpkt_cdev; | |
82 | static struct class_device *diagpkt_class_dev; | |
83 | ||
a2acb2ff | 84 | int ipath_diag_add(struct ipath_devdata *dd) |
097709fe | 85 | { |
a2acb2ff | 86 | char name[16]; |
6ef93ddd RW |
87 | int ret = 0; |
88 | ||
89 | if (atomic_inc_return(&diagpkt_count) == 1) { | |
90 | ret = ipath_cdev_init(IPATH_DIAGPKT_MINOR, | |
91 | "ipath_diagpkt", &diagpkt_file_ops, | |
92 | &diagpkt_cdev, &diagpkt_class_dev); | |
93 | ||
94 | if (ret) { | |
95 | ipath_dev_err(dd, "Couldn't create ipath_diagpkt " | |
96 | "device: %d", ret); | |
97 | goto done; | |
98 | } | |
99 | } | |
a2acb2ff BS |
100 | |
101 | snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit); | |
102 | ||
6ef93ddd RW |
103 | ret = ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name, |
104 | &diag_file_ops, &dd->diag_cdev, | |
105 | &dd->diag_class_dev); | |
106 | if (ret) | |
107 | ipath_dev_err(dd, "Couldn't create %s device: %d", | |
108 | name, ret); | |
109 | ||
110 | done: | |
111 | return ret; | |
097709fe BS |
112 | } |
113 | ||
a2acb2ff | 114 | void ipath_diag_remove(struct ipath_devdata *dd) |
097709fe | 115 | { |
6ef93ddd RW |
116 | if (atomic_dec_and_test(&diagpkt_count)) |
117 | ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_class_dev); | |
118 | ||
a2acb2ff | 119 | ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_class_dev); |
097709fe BS |
120 | } |
121 | ||
122 | /** | |
123 | * ipath_read_umem64 - read a 64-bit quantity from the chip into user space | |
124 | * @dd: the infinipath device | |
125 | * @uaddr: the location to store the data in user memory | |
126 | * @caddr: the source chip address (full pointer, not offset) | |
127 | * @count: number of bytes to copy (multiple of 32 bits) | |
128 | * | |
129 | * This function also localizes all chip memory accesses. | |
130 | * The copy should be written such that we read full cacheline packets | |
131 | * from the chip. This is usually used for a single qword | |
132 | * | |
133 | * NOTE: This assumes the chip address is 64-bit aligned. | |
134 | */ | |
135 | static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr, | |
136 | const void __iomem *caddr, size_t count) | |
137 | { | |
138 | const u64 __iomem *reg_addr = caddr; | |
139 | const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64)); | |
140 | int ret; | |
141 | ||
142 | /* not very efficient, but it works for now */ | |
a2acb2ff | 143 | if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) { |
097709fe BS |
144 | ret = -EINVAL; |
145 | goto bail; | |
146 | } | |
147 | while (reg_addr < reg_end) { | |
148 | u64 data = readq(reg_addr); | |
149 | if (copy_to_user(uaddr, &data, sizeof(u64))) { | |
150 | ret = -EFAULT; | |
151 | goto bail; | |
152 | } | |
153 | reg_addr++; | |
6d8e9dd0 | 154 | uaddr += sizeof(u64); |
097709fe BS |
155 | } |
156 | ret = 0; | |
157 | bail: | |
158 | return ret; | |
159 | } | |
160 | ||
161 | /** | |
162 | * ipath_write_umem64 - write a 64-bit quantity to the chip from user space | |
163 | * @dd: the infinipath device | |
164 | * @caddr: the destination chip address (full pointer, not offset) | |
165 | * @uaddr: the source of the data in user memory | |
166 | * @count: the number of bytes to copy (multiple of 32 bits) | |
167 | * | |
168 | * This is usually used for a single qword | |
169 | * NOTE: This assumes the chip address is 64-bit aligned. | |
170 | */ | |
171 | ||
172 | static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr, | |
173 | const void __user *uaddr, size_t count) | |
174 | { | |
175 | u64 __iomem *reg_addr = caddr; | |
176 | const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64)); | |
177 | int ret; | |
178 | ||
179 | /* not very efficient, but it works for now */ | |
a2acb2ff | 180 | if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) { |
097709fe BS |
181 | ret = -EINVAL; |
182 | goto bail; | |
183 | } | |
184 | while (reg_addr < reg_end) { | |
185 | u64 data; | |
186 | if (copy_from_user(&data, uaddr, sizeof(data))) { | |
187 | ret = -EFAULT; | |
188 | goto bail; | |
189 | } | |
190 | writeq(data, reg_addr); | |
191 | ||
192 | reg_addr++; | |
6d8e9dd0 | 193 | uaddr += sizeof(u64); |
097709fe BS |
194 | } |
195 | ret = 0; | |
196 | bail: | |
197 | return ret; | |
198 | } | |
199 | ||
200 | /** | |
201 | * ipath_read_umem32 - read a 32-bit quantity from the chip into user space | |
202 | * @dd: the infinipath device | |
203 | * @uaddr: the location to store the data in user memory | |
204 | * @caddr: the source chip address (full pointer, not offset) | |
205 | * @count: number of bytes to copy | |
206 | * | |
207 | * read 32 bit values, not 64 bit; for memories that only | |
208 | * support 32 bit reads; usually a single dword. | |
209 | */ | |
210 | static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr, | |
211 | const void __iomem *caddr, size_t count) | |
212 | { | |
213 | const u32 __iomem *reg_addr = caddr; | |
214 | const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32)); | |
215 | int ret; | |
216 | ||
217 | if (reg_addr < (u32 __iomem *) dd->ipath_kregbase || | |
218 | reg_end > (u32 __iomem *) dd->ipath_kregend) { | |
219 | ret = -EINVAL; | |
220 | goto bail; | |
221 | } | |
222 | /* not very efficient, but it works for now */ | |
223 | while (reg_addr < reg_end) { | |
224 | u32 data = readl(reg_addr); | |
225 | if (copy_to_user(uaddr, &data, sizeof(data))) { | |
226 | ret = -EFAULT; | |
227 | goto bail; | |
228 | } | |
229 | ||
230 | reg_addr++; | |
6d8e9dd0 BS |
231 | uaddr += sizeof(u32); |
232 | ||
097709fe BS |
233 | } |
234 | ret = 0; | |
235 | bail: | |
236 | return ret; | |
237 | } | |
238 | ||
239 | /** | |
240 | * ipath_write_umem32 - write a 32-bit quantity to the chip from user space | |
241 | * @dd: the infinipath device | |
242 | * @caddr: the destination chip address (full pointer, not offset) | |
243 | * @uaddr: the source of the data in user memory | |
244 | * @count: number of bytes to copy | |
245 | * | |
246 | * write 32 bit values, not 64 bit; for memories that only | |
247 | * support 32 bit write; usually a single dword. | |
248 | */ | |
249 | ||
250 | static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr, | |
251 | const void __user *uaddr, size_t count) | |
252 | { | |
253 | u32 __iomem *reg_addr = caddr; | |
254 | const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32)); | |
255 | int ret; | |
256 | ||
257 | if (reg_addr < (u32 __iomem *) dd->ipath_kregbase || | |
258 | reg_end > (u32 __iomem *) dd->ipath_kregend) { | |
259 | ret = -EINVAL; | |
260 | goto bail; | |
261 | } | |
262 | while (reg_addr < reg_end) { | |
263 | u32 data; | |
264 | if (copy_from_user(&data, uaddr, sizeof(data))) { | |
265 | ret = -EFAULT; | |
266 | goto bail; | |
267 | } | |
268 | writel(data, reg_addr); | |
269 | ||
270 | reg_addr++; | |
6d8e9dd0 | 271 | uaddr += sizeof(u32); |
097709fe BS |
272 | } |
273 | ret = 0; | |
274 | bail: | |
275 | return ret; | |
276 | } | |
277 | ||
278 | static int ipath_diag_open(struct inode *in, struct file *fp) | |
279 | { | |
a2acb2ff | 280 | int unit = iminor(in) - IPATH_DIAG_MINOR_BASE; |
097709fe | 281 | struct ipath_devdata *dd; |
097709fe BS |
282 | int ret; |
283 | ||
097709fe | 284 | mutex_lock(&ipath_mutex); |
097709fe BS |
285 | |
286 | if (ipath_diag_inuse) { | |
287 | ret = -EBUSY; | |
288 | goto bail; | |
289 | } | |
290 | ||
a2acb2ff BS |
291 | dd = ipath_lookup(unit); |
292 | ||
293 | if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) || | |
294 | !dd->ipath_kregbase) { | |
295 | ret = -ENODEV; | |
097709fe BS |
296 | goto bail; |
297 | } | |
298 | ||
a2acb2ff | 299 | fp->private_data = dd; |
490462c2 | 300 | ipath_diag_inuse = -2; |
a2acb2ff BS |
301 | diag_set_link = 0; |
302 | ret = 0; | |
097709fe BS |
303 | |
304 | /* Only expose a way to reset the device if we | |
305 | make it into diag mode. */ | |
a2acb2ff | 306 | ipath_expose_reset(&dd->pcidev->dev); |
097709fe | 307 | |
a2acb2ff | 308 | bail: |
755e4ca4 BS |
309 | mutex_unlock(&ipath_mutex); |
310 | ||
097709fe BS |
311 | return ret; |
312 | } | |
313 | ||
98341f26 BS |
314 | /** |
315 | * ipath_diagpkt_write - write an IB packet | |
316 | * @fp: the diag data device file pointer | |
317 | * @data: ipath_diag_pkt structure saying where to get the packet | |
318 | * @count: size of data to write | |
319 | * @off: unused by this code | |
320 | */ | |
321 | static ssize_t ipath_diagpkt_write(struct file *fp, | |
322 | const char __user *data, | |
323 | size_t count, loff_t *off) | |
324 | { | |
325 | u32 __iomem *piobuf; | |
326 | u32 plen, clen, pbufn; | |
e8e7ad71 MA |
327 | struct ipath_diag_pkt odp; |
328 | struct ipath_diag_xpkt dp; | |
98341f26 BS |
329 | u32 *tmpbuf = NULL; |
330 | struct ipath_devdata *dd; | |
331 | ssize_t ret = 0; | |
332 | u64 val; | |
333 | ||
e8e7ad71 | 334 | if (count != sizeof(dp)) { |
98341f26 BS |
335 | ret = -EINVAL; |
336 | goto bail; | |
337 | } | |
338 | ||
339 | if (copy_from_user(&dp, data, sizeof(dp))) { | |
340 | ret = -EFAULT; | |
341 | goto bail; | |
342 | } | |
343 | ||
e8e7ad71 MA |
344 | /* |
345 | * Due to padding/alignment issues (lessened with new struct) | |
346 | * the old and new structs are the same length. We need to | |
347 | * disambiguate them, which we can do because odp.len has never | |
348 | * been less than the total of LRH+BTH+DETH so far, while | |
349 | * dp.unit (same offset) unit is unlikely to get that high. | |
350 | * Similarly, dp.data, the pointer to user at the same offset | |
351 | * as odp.unit, is almost certainly at least one (512byte)page | |
352 | * "above" NULL. The if-block below can be omitted if compatibility | |
353 | * between a new driver and older diagnostic code is unimportant. | |
354 | * compatibility the other direction (new diags, old driver) is | |
355 | * handled in the diagnostic code, with a warning. | |
356 | */ | |
357 | if (dp.unit >= 20 && dp.data < 512) { | |
358 | /* very probable version mismatch. Fix it up */ | |
359 | memcpy(&odp, &dp, sizeof(odp)); | |
360 | /* We got a legacy dp, copy elements to dp */ | |
361 | dp.unit = odp.unit; | |
362 | dp.data = odp.data; | |
363 | dp.len = odp.len; | |
364 | dp.pbc_wd = 0; /* Indicate we need to compute PBC wd */ | |
365 | } | |
366 | ||
98341f26 BS |
367 | /* send count must be an exact number of dwords */ |
368 | if (dp.len & 3) { | |
369 | ret = -EINVAL; | |
370 | goto bail; | |
371 | } | |
372 | ||
373 | clen = dp.len >> 2; | |
374 | ||
375 | dd = ipath_lookup(dp.unit); | |
376 | if (!dd || !(dd->ipath_flags & IPATH_PRESENT) || | |
377 | !dd->ipath_kregbase) { | |
378 | ipath_cdbg(VERBOSE, "illegal unit %u for diag data send\n", | |
379 | dp.unit); | |
380 | ret = -ENODEV; | |
381 | goto bail; | |
382 | } | |
383 | ||
384 | if (ipath_diag_inuse && !diag_set_link && | |
385 | !(dd->ipath_flags & IPATH_LINKACTIVE)) { | |
386 | diag_set_link = 1; | |
387 | ipath_cdbg(VERBOSE, "Trying to set to set link active for " | |
388 | "diag pkt\n"); | |
389 | ipath_set_linkstate(dd, IPATH_IB_LINKARM); | |
390 | ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE); | |
391 | } | |
392 | ||
393 | if (!(dd->ipath_flags & IPATH_INITTED)) { | |
394 | /* no hardware, freeze, etc. */ | |
395 | ipath_cdbg(VERBOSE, "unit %u not usable\n", dd->ipath_unit); | |
396 | ret = -ENODEV; | |
397 | goto bail; | |
398 | } | |
e8e7ad71 | 399 | /* Check link state, but not if we have custom PBC */ |
98341f26 | 400 | val = dd->ipath_lastibcstat & IPATH_IBSTATE_MASK; |
e8e7ad71 MA |
401 | if (!dp.pbc_wd && val != IPATH_IBSTATE_INIT && |
402 | val != IPATH_IBSTATE_ARM && val != IPATH_IBSTATE_ACTIVE) { | |
98341f26 BS |
403 | ipath_cdbg(VERBOSE, "unit %u not ready (state %llx)\n", |
404 | dd->ipath_unit, (unsigned long long) val); | |
405 | ret = -EINVAL; | |
406 | goto bail; | |
407 | } | |
408 | ||
409 | /* need total length before first word written */ | |
410 | /* +1 word is for the qword padding */ | |
411 | plen = sizeof(u32) + dp.len; | |
412 | ||
413 | if ((plen + 4) > dd->ipath_ibmaxlen) { | |
414 | ipath_dbg("Pkt len 0x%x > ibmaxlen %x\n", | |
415 | plen - 4, dd->ipath_ibmaxlen); | |
416 | ret = -EINVAL; | |
417 | goto bail; /* before writing pbc */ | |
418 | } | |
419 | tmpbuf = vmalloc(plen); | |
420 | if (!tmpbuf) { | |
421 | dev_info(&dd->pcidev->dev, "Unable to allocate tmp buffer, " | |
422 | "failing\n"); | |
423 | ret = -ENOMEM; | |
424 | goto bail; | |
425 | } | |
426 | ||
427 | if (copy_from_user(tmpbuf, | |
428 | (const void __user *) (unsigned long) dp.data, | |
429 | dp.len)) { | |
430 | ret = -EFAULT; | |
431 | goto bail; | |
432 | } | |
433 | ||
434 | piobuf = ipath_getpiobuf(dd, &pbufn); | |
435 | if (!piobuf) { | |
436 | ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n", | |
437 | dd->ipath_unit); | |
438 | ret = -EBUSY; | |
439 | goto bail; | |
440 | } | |
441 | ||
442 | plen >>= 2; /* in dwords */ | |
443 | ||
444 | if (ipath_debug & __IPATH_PKTDBG) | |
445 | ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n", | |
446 | dd->ipath_unit, plen - 1, pbufn); | |
447 | ||
e8e7ad71 MA |
448 | if (dp.pbc_wd == 0) |
449 | /* Legacy operation, use computed pbc_wd */ | |
450 | dp.pbc_wd = plen; | |
451 | ||
98341f26 BS |
452 | /* we have to flush after the PBC for correctness on some cpus |
453 | * or WC buffer can be written out of order */ | |
e8e7ad71 | 454 | writeq(dp.pbc_wd, piobuf); |
98341f26 BS |
455 | ipath_flush_wc(); |
456 | /* copy all by the trigger word, then flush, so it's written | |
457 | * to chip before trigger word, then write trigger word, then | |
458 | * flush again, so packet is sent. */ | |
459 | __iowrite32_copy(piobuf + 2, tmpbuf, clen - 1); | |
460 | ipath_flush_wc(); | |
461 | __raw_writel(tmpbuf[clen - 1], piobuf + clen + 1); | |
462 | ipath_flush_wc(); | |
463 | ||
464 | ret = sizeof(dp); | |
465 | ||
466 | bail: | |
467 | vfree(tmpbuf); | |
468 | return ret; | |
469 | } | |
470 | ||
a2acb2ff | 471 | static int ipath_diag_release(struct inode *in, struct file *fp) |
097709fe BS |
472 | { |
473 | mutex_lock(&ipath_mutex); | |
474 | ipath_diag_inuse = 0; | |
a2acb2ff | 475 | fp->private_data = NULL; |
097709fe BS |
476 | mutex_unlock(&ipath_mutex); |
477 | return 0; | |
478 | } | |
479 | ||
480 | static ssize_t ipath_diag_read(struct file *fp, char __user *data, | |
481 | size_t count, loff_t *off) | |
482 | { | |
a2acb2ff | 483 | struct ipath_devdata *dd = fp->private_data; |
097709fe BS |
484 | void __iomem *kreg_base; |
485 | ssize_t ret; | |
486 | ||
097709fe BS |
487 | kreg_base = dd->ipath_kregbase; |
488 | ||
489 | if (count == 0) | |
490 | ret = 0; | |
491 | else if ((count % 4) || (*off % 4)) | |
492 | /* address or length is not 32-bit aligned, hence invalid */ | |
493 | ret = -EINVAL; | |
490462c2 BS |
494 | else if (ipath_diag_inuse < 1 && (*off || count != 8)) |
495 | ret = -EINVAL; /* prevent cat /dev/ipath_diag* */ | |
097709fe BS |
496 | else if ((count % 8) || (*off % 8)) |
497 | /* address or length not 64-bit aligned; do 32-bit reads */ | |
498 | ret = ipath_read_umem32(dd, data, kreg_base + *off, count); | |
499 | else | |
500 | ret = ipath_read_umem64(dd, data, kreg_base + *off, count); | |
501 | ||
502 | if (ret >= 0) { | |
503 | *off += count; | |
504 | ret = count; | |
490462c2 BS |
505 | if (ipath_diag_inuse == -2) |
506 | ipath_diag_inuse++; | |
097709fe BS |
507 | } |
508 | ||
097709fe BS |
509 | return ret; |
510 | } | |
511 | ||
512 | static ssize_t ipath_diag_write(struct file *fp, const char __user *data, | |
513 | size_t count, loff_t *off) | |
514 | { | |
a2acb2ff | 515 | struct ipath_devdata *dd = fp->private_data; |
097709fe BS |
516 | void __iomem *kreg_base; |
517 | ssize_t ret; | |
518 | ||
097709fe BS |
519 | kreg_base = dd->ipath_kregbase; |
520 | ||
521 | if (count == 0) | |
522 | ret = 0; | |
523 | else if ((count % 4) || (*off % 4)) | |
524 | /* address or length is not 32-bit aligned, hence invalid */ | |
525 | ret = -EINVAL; | |
490462c2 BS |
526 | else if ((ipath_diag_inuse == -1 && (*off || count != 8)) || |
527 | ipath_diag_inuse == -2) /* read qw off 0, write qw off 0 */ | |
528 | ret = -EINVAL; /* before any other write allowed */ | |
097709fe BS |
529 | else if ((count % 8) || (*off % 8)) |
530 | /* address or length not 64-bit aligned; do 32-bit writes */ | |
531 | ret = ipath_write_umem32(dd, kreg_base + *off, data, count); | |
532 | else | |
533 | ret = ipath_write_umem64(dd, kreg_base + *off, data, count); | |
534 | ||
535 | if (ret >= 0) { | |
536 | *off += count; | |
537 | ret = count; | |
490462c2 BS |
538 | if (ipath_diag_inuse == -1) |
539 | ipath_diag_inuse = 1; /* all read/write OK now */ | |
097709fe BS |
540 | } |
541 | ||
097709fe BS |
542 | return ret; |
543 | } |