Commit | Line | Data |
---|---|---|
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> |
b108d976 | 48 | #include <linux/export.h> |
097709fe BS |
49 | #include <asm/uaccess.h> |
50 | ||
097709fe | 51 | #include "ipath_kernel.h" |
27b678dd | 52 | #include "ipath_common.h" |
097709fe BS |
53 | |
54 | int ipath_diag_inuse; | |
55 | static int diag_set_link; | |
56 | ||
57 | static int ipath_diag_open(struct inode *in, struct file *fp); | |
58 | static int ipath_diag_release(struct inode *in, struct file *fp); | |
59 | static ssize_t ipath_diag_read(struct file *fp, char __user *data, | |
60 | size_t count, loff_t *off); | |
61 | static ssize_t ipath_diag_write(struct file *fp, const char __user *data, | |
62 | size_t count, loff_t *off); | |
63 | ||
2b8693c0 | 64 | static const struct file_operations diag_file_ops = { |
097709fe BS |
65 | .owner = THIS_MODULE, |
66 | .write = ipath_diag_write, | |
67 | .read = ipath_diag_read, | |
68 | .open = ipath_diag_open, | |
6038f373 AB |
69 | .release = ipath_diag_release, |
70 | .llseek = default_llseek, | |
097709fe BS |
71 | }; |
72 | ||
6ef93ddd RW |
73 | static ssize_t ipath_diagpkt_write(struct file *fp, |
74 | const char __user *data, | |
75 | size_t count, loff_t *off); | |
76 | ||
2b8693c0 | 77 | static const struct file_operations diagpkt_file_ops = { |
6ef93ddd RW |
78 | .owner = THIS_MODULE, |
79 | .write = ipath_diagpkt_write, | |
6038f373 | 80 | .llseek = noop_llseek, |
6ef93ddd RW |
81 | }; |
82 | ||
83 | static atomic_t diagpkt_count = ATOMIC_INIT(0); | |
84 | static struct cdev *diagpkt_cdev; | |
f4e91eb4 | 85 | static struct device *diagpkt_dev; |
6ef93ddd | 86 | |
a2acb2ff | 87 | int ipath_diag_add(struct ipath_devdata *dd) |
097709fe | 88 | { |
a2acb2ff | 89 | char name[16]; |
6ef93ddd RW |
90 | int ret = 0; |
91 | ||
92 | if (atomic_inc_return(&diagpkt_count) == 1) { | |
93 | ret = ipath_cdev_init(IPATH_DIAGPKT_MINOR, | |
94 | "ipath_diagpkt", &diagpkt_file_ops, | |
f4e91eb4 | 95 | &diagpkt_cdev, &diagpkt_dev); |
6ef93ddd RW |
96 | |
97 | if (ret) { | |
98 | ipath_dev_err(dd, "Couldn't create ipath_diagpkt " | |
99 | "device: %d", ret); | |
100 | goto done; | |
101 | } | |
102 | } | |
a2acb2ff BS |
103 | |
104 | snprintf(name, sizeof(name), "ipath_diag%d", dd->ipath_unit); | |
105 | ||
6ef93ddd RW |
106 | ret = ipath_cdev_init(IPATH_DIAG_MINOR_BASE + dd->ipath_unit, name, |
107 | &diag_file_ops, &dd->diag_cdev, | |
f4e91eb4 | 108 | &dd->diag_dev); |
6ef93ddd RW |
109 | if (ret) |
110 | ipath_dev_err(dd, "Couldn't create %s device: %d", | |
111 | name, ret); | |
112 | ||
113 | done: | |
114 | return ret; | |
097709fe BS |
115 | } |
116 | ||
a2acb2ff | 117 | void ipath_diag_remove(struct ipath_devdata *dd) |
097709fe | 118 | { |
6ef93ddd | 119 | if (atomic_dec_and_test(&diagpkt_count)) |
f4e91eb4 | 120 | ipath_cdev_cleanup(&diagpkt_cdev, &diagpkt_dev); |
6ef93ddd | 121 | |
f4e91eb4 | 122 | ipath_cdev_cleanup(&dd->diag_cdev, &dd->diag_dev); |
097709fe BS |
123 | } |
124 | ||
125 | /** | |
126 | * ipath_read_umem64 - read a 64-bit quantity from the chip into user space | |
127 | * @dd: the infinipath device | |
128 | * @uaddr: the location to store the data in user memory | |
129 | * @caddr: the source chip address (full pointer, not offset) | |
130 | * @count: number of bytes to copy (multiple of 32 bits) | |
131 | * | |
132 | * This function also localizes all chip memory accesses. | |
133 | * The copy should be written such that we read full cacheline packets | |
134 | * from the chip. This is usually used for a single qword | |
135 | * | |
136 | * NOTE: This assumes the chip address is 64-bit aligned. | |
137 | */ | |
138 | static int ipath_read_umem64(struct ipath_devdata *dd, void __user *uaddr, | |
139 | const void __iomem *caddr, size_t count) | |
140 | { | |
141 | const u64 __iomem *reg_addr = caddr; | |
142 | const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64)); | |
143 | int ret; | |
144 | ||
145 | /* not very efficient, but it works for now */ | |
a2acb2ff | 146 | if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) { |
097709fe BS |
147 | ret = -EINVAL; |
148 | goto bail; | |
149 | } | |
150 | while (reg_addr < reg_end) { | |
151 | u64 data = readq(reg_addr); | |
152 | if (copy_to_user(uaddr, &data, sizeof(u64))) { | |
153 | ret = -EFAULT; | |
154 | goto bail; | |
155 | } | |
156 | reg_addr++; | |
6d8e9dd0 | 157 | uaddr += sizeof(u64); |
097709fe BS |
158 | } |
159 | ret = 0; | |
160 | bail: | |
161 | return ret; | |
162 | } | |
163 | ||
164 | /** | |
165 | * ipath_write_umem64 - write a 64-bit quantity to the chip from user space | |
166 | * @dd: the infinipath device | |
167 | * @caddr: the destination chip address (full pointer, not offset) | |
168 | * @uaddr: the source of the data in user memory | |
169 | * @count: the number of bytes to copy (multiple of 32 bits) | |
170 | * | |
171 | * This is usually used for a single qword | |
172 | * NOTE: This assumes the chip address is 64-bit aligned. | |
173 | */ | |
174 | ||
175 | static int ipath_write_umem64(struct ipath_devdata *dd, void __iomem *caddr, | |
176 | const void __user *uaddr, size_t count) | |
177 | { | |
178 | u64 __iomem *reg_addr = caddr; | |
179 | const u64 __iomem *reg_end = reg_addr + (count / sizeof(u64)); | |
180 | int ret; | |
181 | ||
182 | /* not very efficient, but it works for now */ | |
a2acb2ff | 183 | if (reg_addr < dd->ipath_kregbase || reg_end > dd->ipath_kregend) { |
097709fe BS |
184 | ret = -EINVAL; |
185 | goto bail; | |
186 | } | |
187 | while (reg_addr < reg_end) { | |
188 | u64 data; | |
189 | if (copy_from_user(&data, uaddr, sizeof(data))) { | |
190 | ret = -EFAULT; | |
191 | goto bail; | |
192 | } | |
193 | writeq(data, reg_addr); | |
194 | ||
195 | reg_addr++; | |
6d8e9dd0 | 196 | uaddr += sizeof(u64); |
097709fe BS |
197 | } |
198 | ret = 0; | |
199 | bail: | |
200 | return ret; | |
201 | } | |
202 | ||
203 | /** | |
204 | * ipath_read_umem32 - read a 32-bit quantity from the chip into user space | |
205 | * @dd: the infinipath device | |
206 | * @uaddr: the location to store the data in user memory | |
207 | * @caddr: the source chip address (full pointer, not offset) | |
208 | * @count: number of bytes to copy | |
209 | * | |
210 | * read 32 bit values, not 64 bit; for memories that only | |
211 | * support 32 bit reads; usually a single dword. | |
212 | */ | |
213 | static int ipath_read_umem32(struct ipath_devdata *dd, void __user *uaddr, | |
214 | const void __iomem *caddr, size_t count) | |
215 | { | |
216 | const u32 __iomem *reg_addr = caddr; | |
217 | const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32)); | |
218 | int ret; | |
219 | ||
220 | if (reg_addr < (u32 __iomem *) dd->ipath_kregbase || | |
221 | reg_end > (u32 __iomem *) dd->ipath_kregend) { | |
222 | ret = -EINVAL; | |
223 | goto bail; | |
224 | } | |
225 | /* not very efficient, but it works for now */ | |
226 | while (reg_addr < reg_end) { | |
227 | u32 data = readl(reg_addr); | |
228 | if (copy_to_user(uaddr, &data, sizeof(data))) { | |
229 | ret = -EFAULT; | |
230 | goto bail; | |
231 | } | |
232 | ||
233 | reg_addr++; | |
6d8e9dd0 BS |
234 | uaddr += sizeof(u32); |
235 | ||
097709fe BS |
236 | } |
237 | ret = 0; | |
238 | bail: | |
239 | return ret; | |
240 | } | |
241 | ||
242 | /** | |
243 | * ipath_write_umem32 - write a 32-bit quantity to the chip from user space | |
244 | * @dd: the infinipath device | |
245 | * @caddr: the destination chip address (full pointer, not offset) | |
246 | * @uaddr: the source of the data in user memory | |
247 | * @count: number of bytes to copy | |
248 | * | |
249 | * write 32 bit values, not 64 bit; for memories that only | |
250 | * support 32 bit write; usually a single dword. | |
251 | */ | |
252 | ||
253 | static int ipath_write_umem32(struct ipath_devdata *dd, void __iomem *caddr, | |
254 | const void __user *uaddr, size_t count) | |
255 | { | |
256 | u32 __iomem *reg_addr = caddr; | |
257 | const u32 __iomem *reg_end = reg_addr + (count / sizeof(u32)); | |
258 | int ret; | |
259 | ||
260 | if (reg_addr < (u32 __iomem *) dd->ipath_kregbase || | |
261 | reg_end > (u32 __iomem *) dd->ipath_kregend) { | |
262 | ret = -EINVAL; | |
263 | goto bail; | |
264 | } | |
265 | while (reg_addr < reg_end) { | |
266 | u32 data; | |
267 | if (copy_from_user(&data, uaddr, sizeof(data))) { | |
268 | ret = -EFAULT; | |
269 | goto bail; | |
270 | } | |
271 | writel(data, reg_addr); | |
272 | ||
273 | reg_addr++; | |
6d8e9dd0 | 274 | uaddr += sizeof(u32); |
097709fe BS |
275 | } |
276 | ret = 0; | |
277 | bail: | |
278 | return ret; | |
279 | } | |
280 | ||
281 | static int ipath_diag_open(struct inode *in, struct file *fp) | |
282 | { | |
a2acb2ff | 283 | int unit = iminor(in) - IPATH_DIAG_MINOR_BASE; |
097709fe | 284 | struct ipath_devdata *dd; |
097709fe BS |
285 | int ret; |
286 | ||
097709fe | 287 | mutex_lock(&ipath_mutex); |
097709fe BS |
288 | |
289 | if (ipath_diag_inuse) { | |
290 | ret = -EBUSY; | |
291 | goto bail; | |
292 | } | |
293 | ||
a2acb2ff BS |
294 | dd = ipath_lookup(unit); |
295 | ||
296 | if (dd == NULL || !(dd->ipath_flags & IPATH_PRESENT) || | |
297 | !dd->ipath_kregbase) { | |
298 | ret = -ENODEV; | |
097709fe BS |
299 | goto bail; |
300 | } | |
301 | ||
a2acb2ff | 302 | fp->private_data = dd; |
490462c2 | 303 | ipath_diag_inuse = -2; |
a2acb2ff BS |
304 | diag_set_link = 0; |
305 | ret = 0; | |
097709fe BS |
306 | |
307 | /* Only expose a way to reset the device if we | |
308 | make it into diag mode. */ | |
a2acb2ff | 309 | ipath_expose_reset(&dd->pcidev->dev); |
097709fe | 310 | |
a2acb2ff | 311 | bail: |
755e4ca4 BS |
312 | mutex_unlock(&ipath_mutex); |
313 | ||
097709fe BS |
314 | return ret; |
315 | } | |
316 | ||
98341f26 BS |
317 | /** |
318 | * ipath_diagpkt_write - write an IB packet | |
319 | * @fp: the diag data device file pointer | |
320 | * @data: ipath_diag_pkt structure saying where to get the packet | |
321 | * @count: size of data to write | |
322 | * @off: unused by this code | |
323 | */ | |
324 | static ssize_t ipath_diagpkt_write(struct file *fp, | |
325 | const char __user *data, | |
326 | size_t count, loff_t *off) | |
327 | { | |
328 | u32 __iomem *piobuf; | |
a2cb0eb8 | 329 | u32 plen, pbufn, maxlen_reserve; |
e8e7ad71 MA |
330 | struct ipath_diag_pkt odp; |
331 | struct ipath_diag_xpkt dp; | |
98341f26 BS |
332 | u32 *tmpbuf = NULL; |
333 | struct ipath_devdata *dd; | |
334 | ssize_t ret = 0; | |
335 | u64 val; | |
58411d1c | 336 | u32 l_state, lt_state; /* LinkState, LinkTrainingState */ |
98341f26 | 337 | |
98341f26 | 338 | |
afd9970f MA |
339 | if (count == sizeof(dp)) { |
340 | if (copy_from_user(&dp, data, sizeof(dp))) { | |
341 | ret = -EFAULT; | |
342 | goto bail; | |
343 | } | |
a2cb0eb8 DD |
344 | } else if (count == sizeof(odp)) { |
345 | if (copy_from_user(&odp, data, sizeof(odp))) { | |
346 | ret = -EFAULT; | |
347 | goto bail; | |
348 | } | |
7e6d3e5c DD |
349 | dp.len = odp.len; |
350 | dp.unit = odp.unit; | |
351 | dp.data = odp.data; | |
352 | dp.pbc_wd = 0; | |
a2cb0eb8 DD |
353 | } else { |
354 | ret = -EINVAL; | |
98341f26 BS |
355 | goto bail; |
356 | } | |
357 | ||
358 | /* send count must be an exact number of dwords */ | |
359 | if (dp.len & 3) { | |
360 | ret = -EINVAL; | |
361 | goto bail; | |
362 | } | |
363 | ||
a2cb0eb8 | 364 | plen = dp.len >> 2; |
98341f26 BS |
365 | |
366 | dd = ipath_lookup(dp.unit); | |
367 | if (!dd || !(dd->ipath_flags & IPATH_PRESENT) || | |
368 | !dd->ipath_kregbase) { | |
369 | ipath_cdbg(VERBOSE, "illegal unit %u for diag data send\n", | |
370 | dp.unit); | |
371 | ret = -ENODEV; | |
372 | goto bail; | |
373 | } | |
374 | ||
375 | if (ipath_diag_inuse && !diag_set_link && | |
376 | !(dd->ipath_flags & IPATH_LINKACTIVE)) { | |
377 | diag_set_link = 1; | |
378 | ipath_cdbg(VERBOSE, "Trying to set to set link active for " | |
379 | "diag pkt\n"); | |
380 | ipath_set_linkstate(dd, IPATH_IB_LINKARM); | |
381 | ipath_set_linkstate(dd, IPATH_IB_LINKACTIVE); | |
382 | } | |
383 | ||
384 | if (!(dd->ipath_flags & IPATH_INITTED)) { | |
385 | /* no hardware, freeze, etc. */ | |
386 | ipath_cdbg(VERBOSE, "unit %u not usable\n", dd->ipath_unit); | |
387 | ret = -ENODEV; | |
388 | goto bail; | |
389 | } | |
58411d1c JG |
390 | /* |
391 | * Want to skip check for l_state if using custom PBC, | |
392 | * because we might be trying to force an SM packet out. | |
393 | * first-cut, skip _all_ state checking in that case. | |
394 | */ | |
395 | val = ipath_ib_state(dd, dd->ipath_lastibcstat); | |
396 | lt_state = ipath_ib_linktrstate(dd, dd->ipath_lastibcstat); | |
397 | l_state = ipath_ib_linkstate(dd, dd->ipath_lastibcstat); | |
398 | if (!dp.pbc_wd && (lt_state != INFINIPATH_IBCS_LT_STATE_LINKUP || | |
399 | (val != dd->ib_init && val != dd->ib_arm && | |
400 | val != dd->ib_active))) { | |
98341f26 BS |
401 | ipath_cdbg(VERBOSE, "unit %u not ready (state %llx)\n", |
402 | dd->ipath_unit, (unsigned long long) val); | |
403 | ret = -EINVAL; | |
404 | goto bail; | |
405 | } | |
406 | ||
a2cb0eb8 DD |
407 | /* |
408 | * need total length before first word written, plus 2 Dwords. One Dword | |
409 | * is for padding so we get the full user data when not aligned on | |
410 | * a word boundary. The other Dword is to make sure we have room for the | |
411 | * ICRC which gets tacked on later. | |
412 | */ | |
413 | maxlen_reserve = 2 * sizeof(u32); | |
414 | if (dp.len > dd->ipath_ibmaxlen - maxlen_reserve) { | |
98341f26 | 415 | ipath_dbg("Pkt len 0x%x > ibmaxlen %x\n", |
a2cb0eb8 | 416 | dp.len, dd->ipath_ibmaxlen); |
98341f26 | 417 | ret = -EINVAL; |
a2cb0eb8 | 418 | goto bail; |
98341f26 | 419 | } |
a2cb0eb8 DD |
420 | |
421 | plen = sizeof(u32) + dp.len; | |
422 | ||
98341f26 BS |
423 | tmpbuf = vmalloc(plen); |
424 | if (!tmpbuf) { | |
425 | dev_info(&dd->pcidev->dev, "Unable to allocate tmp buffer, " | |
426 | "failing\n"); | |
427 | ret = -ENOMEM; | |
428 | goto bail; | |
429 | } | |
430 | ||
431 | if (copy_from_user(tmpbuf, | |
432 | (const void __user *) (unsigned long) dp.data, | |
433 | dp.len)) { | |
434 | ret = -EFAULT; | |
435 | goto bail; | |
436 | } | |
437 | ||
c4b4d16e RC |
438 | plen >>= 2; /* in dwords */ |
439 | ||
440 | piobuf = ipath_getpiobuf(dd, plen, &pbufn); | |
98341f26 BS |
441 | if (!piobuf) { |
442 | ipath_cdbg(VERBOSE, "No PIO buffers avail unit for %u\n", | |
443 | dd->ipath_unit); | |
444 | ret = -EBUSY; | |
445 | goto bail; | |
446 | } | |
58411d1c JG |
447 | /* disarm it just to be extra sure */ |
448 | ipath_disarm_piobufs(dd, pbufn, 1); | |
98341f26 | 449 | |
98341f26 BS |
450 | if (ipath_debug & __IPATH_PKTDBG) |
451 | ipath_cdbg(VERBOSE, "unit %u 0x%x+1w pio%d\n", | |
452 | dd->ipath_unit, plen - 1, pbufn); | |
453 | ||
e8e7ad71 | 454 | if (dp.pbc_wd == 0) |
e8e7ad71 | 455 | dp.pbc_wd = plen; |
e8e7ad71 | 456 | writeq(dp.pbc_wd, piobuf); |
210d6ca3 RC |
457 | /* |
458 | * Copy all by the trigger word, then flush, so it's written | |
98341f26 | 459 | * to chip before trigger word, then write trigger word, then |
210d6ca3 RC |
460 | * flush again, so packet is sent. |
461 | */ | |
462 | if (dd->ipath_flags & IPATH_PIO_FLUSH_WC) { | |
463 | ipath_flush_wc(); | |
a2cb0eb8 | 464 | __iowrite32_copy(piobuf + 2, tmpbuf, plen - 1); |
210d6ca3 | 465 | ipath_flush_wc(); |
a2cb0eb8 | 466 | __raw_writel(tmpbuf[plen - 1], piobuf + plen + 1); |
210d6ca3 | 467 | } else |
a2cb0eb8 | 468 | __iowrite32_copy(piobuf + 2, tmpbuf, plen); |
210d6ca3 | 469 | |
98341f26 BS |
470 | ipath_flush_wc(); |
471 | ||
472 | ret = sizeof(dp); | |
473 | ||
474 | bail: | |
475 | vfree(tmpbuf); | |
476 | return ret; | |
477 | } | |
478 | ||
a2acb2ff | 479 | static int ipath_diag_release(struct inode *in, struct file *fp) |
097709fe BS |
480 | { |
481 | mutex_lock(&ipath_mutex); | |
482 | ipath_diag_inuse = 0; | |
a2acb2ff | 483 | fp->private_data = NULL; |
097709fe BS |
484 | mutex_unlock(&ipath_mutex); |
485 | return 0; | |
486 | } | |
487 | ||
488 | static ssize_t ipath_diag_read(struct file *fp, char __user *data, | |
489 | size_t count, loff_t *off) | |
490 | { | |
a2acb2ff | 491 | struct ipath_devdata *dd = fp->private_data; |
097709fe BS |
492 | void __iomem *kreg_base; |
493 | ssize_t ret; | |
494 | ||
097709fe BS |
495 | kreg_base = dd->ipath_kregbase; |
496 | ||
497 | if (count == 0) | |
498 | ret = 0; | |
499 | else if ((count % 4) || (*off % 4)) | |
500 | /* address or length is not 32-bit aligned, hence invalid */ | |
501 | ret = -EINVAL; | |
490462c2 BS |
502 | else if (ipath_diag_inuse < 1 && (*off || count != 8)) |
503 | ret = -EINVAL; /* prevent cat /dev/ipath_diag* */ | |
097709fe BS |
504 | else if ((count % 8) || (*off % 8)) |
505 | /* address or length not 64-bit aligned; do 32-bit reads */ | |
506 | ret = ipath_read_umem32(dd, data, kreg_base + *off, count); | |
507 | else | |
508 | ret = ipath_read_umem64(dd, data, kreg_base + *off, count); | |
509 | ||
510 | if (ret >= 0) { | |
511 | *off += count; | |
512 | ret = count; | |
490462c2 BS |
513 | if (ipath_diag_inuse == -2) |
514 | ipath_diag_inuse++; | |
097709fe BS |
515 | } |
516 | ||
097709fe BS |
517 | return ret; |
518 | } | |
519 | ||
520 | static ssize_t ipath_diag_write(struct file *fp, const char __user *data, | |
521 | size_t count, loff_t *off) | |
522 | { | |
a2acb2ff | 523 | struct ipath_devdata *dd = fp->private_data; |
097709fe BS |
524 | void __iomem *kreg_base; |
525 | ssize_t ret; | |
526 | ||
097709fe BS |
527 | kreg_base = dd->ipath_kregbase; |
528 | ||
529 | if (count == 0) | |
530 | ret = 0; | |
531 | else if ((count % 4) || (*off % 4)) | |
532 | /* address or length is not 32-bit aligned, hence invalid */ | |
533 | ret = -EINVAL; | |
490462c2 BS |
534 | else if ((ipath_diag_inuse == -1 && (*off || count != 8)) || |
535 | ipath_diag_inuse == -2) /* read qw off 0, write qw off 0 */ | |
536 | ret = -EINVAL; /* before any other write allowed */ | |
097709fe BS |
537 | else if ((count % 8) || (*off % 8)) |
538 | /* address or length not 64-bit aligned; do 32-bit writes */ | |
539 | ret = ipath_write_umem32(dd, kreg_base + *off, data, count); | |
540 | else | |
541 | ret = ipath_write_umem64(dd, kreg_base + *off, data, count); | |
542 | ||
543 | if (ret >= 0) { | |
544 | *off += count; | |
545 | ret = count; | |
490462c2 BS |
546 | if (ipath_diag_inuse == -1) |
547 | ipath_diag_inuse = 1; /* all read/write OK now */ | |
097709fe BS |
548 | } |
549 | ||
097709fe BS |
550 | return ret; |
551 | } |