Commit | Line | Data |
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7f510b46 | 1 | /* |
c7e29ff1 | 2 | * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved. |
7f510b46 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 | #include <linux/pci.h> | |
35 | #include <linux/poll.h> | |
36 | #include <linux/cdev.h> | |
37 | #include <linux/swap.h> | |
38 | #include <linux/vmalloc.h> | |
39 | #include <asm/pgtable.h> | |
40 | ||
41 | #include "ipath_kernel.h" | |
27b678dd | 42 | #include "ipath_common.h" |
7f510b46 BS |
43 | |
44 | static int ipath_open(struct inode *, struct file *); | |
45 | static int ipath_close(struct inode *, struct file *); | |
46 | static ssize_t ipath_write(struct file *, const char __user *, size_t, | |
47 | loff_t *); | |
48 | static unsigned int ipath_poll(struct file *, struct poll_table_struct *); | |
49 | static int ipath_mmap(struct file *, struct vm_area_struct *); | |
50 | ||
2b8693c0 | 51 | static const struct file_operations ipath_file_ops = { |
7f510b46 BS |
52 | .owner = THIS_MODULE, |
53 | .write = ipath_write, | |
54 | .open = ipath_open, | |
55 | .release = ipath_close, | |
56 | .poll = ipath_poll, | |
57 | .mmap = ipath_mmap | |
58 | }; | |
59 | ||
0a5a83cf RC |
60 | /* |
61 | * Convert kernel virtual addresses to physical addresses so they don't | |
62 | * potentially conflict with the chip addresses used as mmap offsets. | |
63 | * It doesn't really matter what mmap offset we use as long as we can | |
64 | * interpret it correctly. | |
65 | */ | |
66 | static u64 cvt_kvaddr(void *p) | |
67 | { | |
68 | struct page *page; | |
69 | u64 paddr = 0; | |
70 | ||
71 | page = vmalloc_to_page(p); | |
72 | if (page) | |
73 | paddr = page_to_pfn(page) << PAGE_SHIFT; | |
74 | ||
75 | return paddr; | |
76 | } | |
77 | ||
9929b0fb | 78 | static int ipath_get_base_info(struct file *fp, |
7f510b46 BS |
79 | void __user *ubase, size_t ubase_size) |
80 | { | |
9929b0fb | 81 | struct ipath_portdata *pd = port_fp(fp); |
7f510b46 BS |
82 | int ret = 0; |
83 | struct ipath_base_info *kinfo = NULL; | |
84 | struct ipath_devdata *dd = pd->port_dd; | |
9929b0fb BS |
85 | unsigned subport_cnt; |
86 | int shared, master; | |
87 | size_t sz; | |
88 | ||
89 | subport_cnt = pd->port_subport_cnt; | |
90 | if (!subport_cnt) { | |
91 | shared = 0; | |
92 | master = 0; | |
93 | subport_cnt = 1; | |
94 | } else { | |
95 | shared = 1; | |
96 | master = !subport_fp(fp); | |
97 | } | |
7f510b46 | 98 | |
9929b0fb BS |
99 | sz = sizeof(*kinfo); |
100 | /* If port sharing is not requested, allow the old size structure */ | |
101 | if (!shared) | |
c7e29ff1 | 102 | sz -= 7 * sizeof(u64); |
9929b0fb | 103 | if (ubase_size < sz) { |
7f510b46 | 104 | ipath_cdbg(PROC, |
9929b0fb BS |
105 | "Base size %zu, need %zu (version mismatch?)\n", |
106 | ubase_size, sz); | |
7f510b46 BS |
107 | ret = -EINVAL; |
108 | goto bail; | |
109 | } | |
110 | ||
111 | kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL); | |
112 | if (kinfo == NULL) { | |
113 | ret = -ENOMEM; | |
114 | goto bail; | |
115 | } | |
116 | ||
117 | ret = dd->ipath_f_get_base_info(pd, kinfo); | |
118 | if (ret < 0) | |
119 | goto bail; | |
120 | ||
121 | kinfo->spi_rcvhdr_cnt = dd->ipath_rcvhdrcnt; | |
122 | kinfo->spi_rcvhdrent_size = dd->ipath_rcvhdrentsize; | |
123 | kinfo->spi_tidegrcnt = dd->ipath_rcvegrcnt; | |
124 | kinfo->spi_rcv_egrbufsize = dd->ipath_rcvegrbufsize; | |
125 | /* | |
126 | * have to mmap whole thing | |
127 | */ | |
128 | kinfo->spi_rcv_egrbuftotlen = | |
129 | pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size; | |
130 | kinfo->spi_rcv_egrperchunk = pd->port_rcvegrbufs_perchunk; | |
131 | kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen / | |
132 | pd->port_rcvegrbuf_chunks; | |
9929b0fb BS |
133 | kinfo->spi_tidcnt = dd->ipath_rcvtidcnt / subport_cnt; |
134 | if (master) | |
135 | kinfo->spi_tidcnt += dd->ipath_rcvtidcnt % subport_cnt; | |
7f510b46 BS |
136 | /* |
137 | * for this use, may be ipath_cfgports summed over all chips that | |
138 | * are are configured and present | |
139 | */ | |
140 | kinfo->spi_nports = dd->ipath_cfgports; | |
141 | /* unit (chip/board) our port is on */ | |
142 | kinfo->spi_unit = dd->ipath_unit; | |
143 | /* for now, only a single page */ | |
144 | kinfo->spi_tid_maxsize = PAGE_SIZE; | |
145 | ||
146 | /* | |
147 | * Doing this per port, and based on the skip value, etc. This has | |
148 | * to be the actual buffer size, since the protocol code treats it | |
149 | * as an array. | |
150 | * | |
151 | * These have to be set to user addresses in the user code via mmap. | |
152 | * These values are used on return to user code for the mmap target | |
153 | * addresses only. For 32 bit, same 44 bit address problem, so use | |
154 | * the physical address, not virtual. Before 2.6.11, using the | |
155 | * page_address() macro worked, but in 2.6.11, even that returns the | |
156 | * full 64 bit address (upper bits all 1's). So far, using the | |
157 | * physical addresses (or chip offsets, for chip mapping) works, but | |
9929b0fb BS |
158 | * no doubt some future kernel release will change that, and we'll be |
159 | * on to yet another method of dealing with this. | |
7f510b46 BS |
160 | */ |
161 | kinfo->spi_rcvhdr_base = (u64) pd->port_rcvhdrq_phys; | |
9929b0fb | 162 | kinfo->spi_rcvhdr_tailaddr = (u64) pd->port_rcvhdrqtailaddr_phys; |
7f510b46 BS |
163 | kinfo->spi_rcv_egrbufs = (u64) pd->port_rcvegr_phys; |
164 | kinfo->spi_pioavailaddr = (u64) dd->ipath_pioavailregs_phys; | |
165 | kinfo->spi_status = (u64) kinfo->spi_pioavailaddr + | |
166 | (void *) dd->ipath_statusp - | |
167 | (void *) dd->ipath_pioavailregs_dma; | |
9929b0fb BS |
168 | if (!shared) { |
169 | kinfo->spi_piocnt = dd->ipath_pbufsport; | |
170 | kinfo->spi_piobufbase = (u64) pd->port_piobufs; | |
171 | kinfo->__spi_uregbase = (u64) dd->ipath_uregbase + | |
a18e26ae | 172 | dd->ipath_ureg_align * pd->port_port; |
9929b0fb BS |
173 | } else if (master) { |
174 | kinfo->spi_piocnt = (dd->ipath_pbufsport / subport_cnt) + | |
175 | (dd->ipath_pbufsport % subport_cnt); | |
176 | /* Master's PIO buffers are after all the slave's */ | |
177 | kinfo->spi_piobufbase = (u64) pd->port_piobufs + | |
178 | dd->ipath_palign * | |
179 | (dd->ipath_pbufsport - kinfo->spi_piocnt); | |
9929b0fb BS |
180 | } else { |
181 | unsigned slave = subport_fp(fp) - 1; | |
7f510b46 | 182 | |
9929b0fb BS |
183 | kinfo->spi_piocnt = dd->ipath_pbufsport / subport_cnt; |
184 | kinfo->spi_piobufbase = (u64) pd->port_piobufs + | |
185 | dd->ipath_palign * kinfo->spi_piocnt * slave; | |
c7e29ff1 | 186 | } |
1d7c2e52 DO |
187 | |
188 | /* | |
189 | * Set the PIO avail update threshold to no larger | |
190 | * than the number of buffers per process. Note that | |
191 | * we decrease it here, but won't ever increase it. | |
192 | */ | |
193 | if (dd->ipath_pioupd_thresh && | |
194 | kinfo->spi_piocnt < dd->ipath_pioupd_thresh) { | |
195 | unsigned long flags; | |
196 | ||
197 | dd->ipath_pioupd_thresh = kinfo->spi_piocnt; | |
198 | ipath_dbg("Decreased pio update threshold to %u\n", | |
199 | dd->ipath_pioupd_thresh); | |
200 | spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags); | |
201 | dd->ipath_sendctrl &= ~(INFINIPATH_S_UPDTHRESH_MASK | |
202 | << INFINIPATH_S_UPDTHRESH_SHIFT); | |
203 | dd->ipath_sendctrl |= dd->ipath_pioupd_thresh | |
204 | << INFINIPATH_S_UPDTHRESH_SHIFT; | |
205 | ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, | |
206 | dd->ipath_sendctrl); | |
207 | spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags); | |
208 | } | |
209 | ||
c7e29ff1 MD |
210 | if (shared) { |
211 | kinfo->spi_port_uregbase = (u64) dd->ipath_uregbase + | |
a18e26ae | 212 | dd->ipath_ureg_align * pd->port_port; |
c7e29ff1 MD |
213 | kinfo->spi_port_rcvegrbuf = kinfo->spi_rcv_egrbufs; |
214 | kinfo->spi_port_rcvhdr_base = kinfo->spi_rcvhdr_base; | |
215 | kinfo->spi_port_rcvhdr_tailaddr = kinfo->spi_rcvhdr_tailaddr; | |
216 | ||
0a5a83cf | 217 | kinfo->__spi_uregbase = cvt_kvaddr(pd->subport_uregbase + |
c7e29ff1 | 218 | PAGE_SIZE * subport_fp(fp)); |
9929b0fb | 219 | |
0a5a83cf | 220 | kinfo->spi_rcvhdr_base = cvt_kvaddr(pd->subport_rcvhdr_base + |
c7e29ff1 | 221 | pd->port_rcvhdrq_size * subport_fp(fp)); |
947d7617 | 222 | kinfo->spi_rcvhdr_tailaddr = 0; |
0a5a83cf | 223 | kinfo->spi_rcv_egrbufs = cvt_kvaddr(pd->subport_rcvegrbuf + |
c7e29ff1 MD |
224 | pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size * |
225 | subport_fp(fp)); | |
226 | ||
227 | kinfo->spi_subport_uregbase = | |
228 | cvt_kvaddr(pd->subport_uregbase); | |
229 | kinfo->spi_subport_rcvegrbuf = | |
230 | cvt_kvaddr(pd->subport_rcvegrbuf); | |
231 | kinfo->spi_subport_rcvhdr_base = | |
232 | cvt_kvaddr(pd->subport_rcvhdr_base); | |
233 | ipath_cdbg(PROC, "port %u flags %x %llx %llx %llx\n", | |
234 | kinfo->spi_port, kinfo->spi_runtime_flags, | |
235 | (unsigned long long) kinfo->spi_subport_uregbase, | |
236 | (unsigned long long) kinfo->spi_subport_rcvegrbuf, | |
237 | (unsigned long long) kinfo->spi_subport_rcvhdr_base); | |
9929b0fb BS |
238 | } |
239 | ||
240 | kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->ipath_piobufbase) / | |
241 | dd->ipath_palign; | |
7f510b46 BS |
242 | kinfo->spi_pioalign = dd->ipath_palign; |
243 | ||
244 | kinfo->spi_qpair = IPATH_KD_QP; | |
826d8010 DO |
245 | /* |
246 | * user mode PIO buffers are always 2KB, even when 4KB can | |
247 | * be received, and sent via the kernel; this is ibmaxlen | |
248 | * for 2K MTU. | |
249 | */ | |
250 | kinfo->spi_piosize = dd->ipath_piosize2k - 2 * sizeof(u32); | |
7f510b46 BS |
251 | kinfo->spi_mtu = dd->ipath_ibmaxlen; /* maxlen, not ibmtu */ |
252 | kinfo->spi_port = pd->port_port; | |
9929b0fb | 253 | kinfo->spi_subport = subport_fp(fp); |
eaf6733b | 254 | kinfo->spi_sw_version = IPATH_KERN_SWVERSION; |
7f510b46 BS |
255 | kinfo->spi_hw_version = dd->ipath_revision; |
256 | ||
9929b0fb BS |
257 | if (master) { |
258 | kinfo->spi_runtime_flags |= IPATH_RUNTIME_MASTER; | |
9929b0fb BS |
259 | } |
260 | ||
c7e29ff1 MD |
261 | sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo); |
262 | if (copy_to_user(ubase, kinfo, sz)) | |
7f510b46 BS |
263 | ret = -EFAULT; |
264 | ||
265 | bail: | |
266 | kfree(kinfo); | |
267 | return ret; | |
268 | } | |
269 | ||
270 | /** | |
271 | * ipath_tid_update - update a port TID | |
272 | * @pd: the port | |
9929b0fb | 273 | * @fp: the ipath device file |
7f510b46 BS |
274 | * @ti: the TID information |
275 | * | |
276 | * The new implementation as of Oct 2004 is that the driver assigns | |
277 | * the tid and returns it to the caller. To make it easier to | |
278 | * catch bugs, and to reduce search time, we keep a cursor for | |
279 | * each port, walking the shadow tid array to find one that's not | |
280 | * in use. | |
281 | * | |
282 | * For now, if we can't allocate the full list, we fail, although | |
283 | * in the long run, we'll allocate as many as we can, and the | |
284 | * caller will deal with that by trying the remaining pages later. | |
285 | * That means that when we fail, we have to mark the tids as not in | |
286 | * use again, in our shadow copy. | |
287 | * | |
288 | * It's up to the caller to free the tids when they are done. | |
289 | * We'll unlock the pages as they free them. | |
290 | * | |
291 | * Also, right now we are locking one page at a time, but since | |
292 | * the intended use of this routine is for a single group of | |
293 | * virtually contiguous pages, that should change to improve | |
294 | * performance. | |
295 | */ | |
9929b0fb | 296 | static int ipath_tid_update(struct ipath_portdata *pd, struct file *fp, |
7f510b46 BS |
297 | const struct ipath_tid_info *ti) |
298 | { | |
299 | int ret = 0, ntids; | |
9929b0fb | 300 | u32 tid, porttid, cnt, i, tidcnt, tidoff; |
7f510b46 BS |
301 | u16 *tidlist; |
302 | struct ipath_devdata *dd = pd->port_dd; | |
303 | u64 physaddr; | |
304 | unsigned long vaddr; | |
305 | u64 __iomem *tidbase; | |
306 | unsigned long tidmap[8]; | |
307 | struct page **pagep = NULL; | |
9929b0fb | 308 | unsigned subport = subport_fp(fp); |
7f510b46 BS |
309 | |
310 | if (!dd->ipath_pageshadow) { | |
311 | ret = -ENOMEM; | |
312 | goto done; | |
313 | } | |
314 | ||
315 | cnt = ti->tidcnt; | |
316 | if (!cnt) { | |
317 | ipath_dbg("After copyin, tidcnt 0, tidlist %llx\n", | |
318 | (unsigned long long) ti->tidlist); | |
319 | /* | |
320 | * Should we treat as success? likely a bug | |
321 | */ | |
322 | ret = -EFAULT; | |
323 | goto done; | |
324 | } | |
9929b0fb BS |
325 | porttid = pd->port_port * dd->ipath_rcvtidcnt; |
326 | if (!pd->port_subport_cnt) { | |
327 | tidcnt = dd->ipath_rcvtidcnt; | |
328 | tid = pd->port_tidcursor; | |
329 | tidoff = 0; | |
330 | } else if (!subport) { | |
331 | tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) + | |
332 | (dd->ipath_rcvtidcnt % pd->port_subport_cnt); | |
333 | tidoff = dd->ipath_rcvtidcnt - tidcnt; | |
334 | porttid += tidoff; | |
335 | tid = tidcursor_fp(fp); | |
336 | } else { | |
337 | tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt; | |
338 | tidoff = tidcnt * (subport - 1); | |
339 | porttid += tidoff; | |
340 | tid = tidcursor_fp(fp); | |
341 | } | |
342 | if (cnt > tidcnt) { | |
7f510b46 BS |
343 | /* make sure it all fits in port_tid_pg_list */ |
344 | dev_info(&dd->pcidev->dev, "Process tried to allocate %u " | |
345 | "TIDs, only trying max (%u)\n", cnt, tidcnt); | |
346 | cnt = tidcnt; | |
347 | } | |
9929b0fb BS |
348 | pagep = &((struct page **) pd->port_tid_pg_list)[tidoff]; |
349 | tidlist = &((u16 *) &pagep[dd->ipath_rcvtidcnt])[tidoff]; | |
7f510b46 BS |
350 | |
351 | memset(tidmap, 0, sizeof(tidmap)); | |
7f510b46 | 352 | /* before decrement; chip actual # */ |
7f510b46 BS |
353 | ntids = tidcnt; |
354 | tidbase = (u64 __iomem *) (((char __iomem *) dd->ipath_kregbase) + | |
355 | dd->ipath_rcvtidbase + | |
356 | porttid * sizeof(*tidbase)); | |
357 | ||
358 | ipath_cdbg(VERBOSE, "Port%u %u tids, cursor %u, tidbase %p\n", | |
359 | pd->port_port, cnt, tid, tidbase); | |
360 | ||
361 | /* virtual address of first page in transfer */ | |
362 | vaddr = ti->tidvaddr; | |
363 | if (!access_ok(VERIFY_WRITE, (void __user *) vaddr, | |
364 | cnt * PAGE_SIZE)) { | |
365 | ipath_dbg("Fail vaddr %p, %u pages, !access_ok\n", | |
366 | (void *)vaddr, cnt); | |
367 | ret = -EFAULT; | |
368 | goto done; | |
369 | } | |
370 | ret = ipath_get_user_pages(vaddr, cnt, pagep); | |
371 | if (ret) { | |
372 | if (ret == -EBUSY) { | |
373 | ipath_dbg("Failed to lock addr %p, %u pages " | |
374 | "(already locked)\n", | |
375 | (void *) vaddr, cnt); | |
376 | /* | |
377 | * for now, continue, and see what happens but with | |
378 | * the new implementation, this should never happen, | |
379 | * unless perhaps the user has mpin'ed the pages | |
380 | * themselves (something we need to test) | |
381 | */ | |
382 | ret = 0; | |
383 | } else { | |
384 | dev_info(&dd->pcidev->dev, | |
385 | "Failed to lock addr %p, %u pages: " | |
386 | "errno %d\n", (void *) vaddr, cnt, -ret); | |
387 | goto done; | |
388 | } | |
389 | } | |
390 | for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) { | |
391 | for (; ntids--; tid++) { | |
392 | if (tid == tidcnt) | |
393 | tid = 0; | |
394 | if (!dd->ipath_pageshadow[porttid + tid]) | |
395 | break; | |
396 | } | |
397 | if (ntids < 0) { | |
398 | /* | |
399 | * oops, wrapped all the way through their TIDs, | |
400 | * and didn't have enough free; see comments at | |
401 | * start of routine | |
402 | */ | |
403 | ipath_dbg("Not enough free TIDs for %u pages " | |
404 | "(index %d), failing\n", cnt, i); | |
405 | i--; /* last tidlist[i] not filled in */ | |
406 | ret = -ENOMEM; | |
407 | break; | |
408 | } | |
9929b0fb | 409 | tidlist[i] = tid + tidoff; |
7f510b46 | 410 | ipath_cdbg(VERBOSE, "Updating idx %u to TID %u, " |
9929b0fb | 411 | "vaddr %lx\n", i, tid + tidoff, vaddr); |
7f510b46 BS |
412 | /* we "know" system pages and TID pages are same size */ |
413 | dd->ipath_pageshadow[porttid + tid] = pagep[i]; | |
1fd3b40f BS |
414 | dd->ipath_physshadow[porttid + tid] = ipath_map_page( |
415 | dd->pcidev, pagep[i], 0, PAGE_SIZE, | |
416 | PCI_DMA_FROMDEVICE); | |
7f510b46 BS |
417 | /* |
418 | * don't need atomic or it's overhead | |
419 | */ | |
420 | __set_bit(tid, tidmap); | |
1fd3b40f | 421 | physaddr = dd->ipath_physshadow[porttid + tid]; |
7f510b46 BS |
422 | ipath_stats.sps_pagelocks++; |
423 | ipath_cdbg(VERBOSE, | |
424 | "TID %u, vaddr %lx, physaddr %llx pgp %p\n", | |
425 | tid, vaddr, (unsigned long long) physaddr, | |
426 | pagep[i]); | |
f716cdfe JE |
427 | dd->ipath_f_put_tid(dd, &tidbase[tid], RCVHQ_RCV_TYPE_EXPECTED, |
428 | physaddr); | |
7f510b46 BS |
429 | /* |
430 | * don't check this tid in ipath_portshadow, since we | |
431 | * just filled it in; start with the next one. | |
432 | */ | |
433 | tid++; | |
434 | } | |
435 | ||
436 | if (ret) { | |
437 | u32 limit; | |
438 | cleanup: | |
439 | /* jump here if copy out of updated info failed... */ | |
440 | ipath_dbg("After failure (ret=%d), undo %d of %d entries\n", | |
441 | -ret, i, cnt); | |
442 | /* same code that's in ipath_free_tid() */ | |
443 | limit = sizeof(tidmap) * BITS_PER_BYTE; | |
444 | if (limit > tidcnt) | |
445 | /* just in case size changes in future */ | |
446 | limit = tidcnt; | |
447 | tid = find_first_bit((const unsigned long *)tidmap, limit); | |
448 | for (; tid < limit; tid++) { | |
449 | if (!test_bit(tid, tidmap)) | |
450 | continue; | |
451 | if (dd->ipath_pageshadow[porttid + tid]) { | |
452 | ipath_cdbg(VERBOSE, "Freeing TID %u\n", | |
453 | tid); | |
f716cdfe JE |
454 | dd->ipath_f_put_tid(dd, &tidbase[tid], |
455 | RCVHQ_RCV_TYPE_EXPECTED, | |
7f510b46 | 456 | dd->ipath_tidinvalid); |
1fd3b40f BS |
457 | pci_unmap_page(dd->pcidev, |
458 | dd->ipath_physshadow[porttid + tid], | |
459 | PAGE_SIZE, PCI_DMA_FROMDEVICE); | |
7f510b46 BS |
460 | dd->ipath_pageshadow[porttid + tid] = NULL; |
461 | ipath_stats.sps_pageunlocks++; | |
462 | } | |
463 | } | |
464 | ipath_release_user_pages(pagep, cnt); | |
465 | } else { | |
466 | /* | |
467 | * Copy the updated array, with ipath_tid's filled in, back | |
468 | * to user. Since we did the copy in already, this "should | |
469 | * never fail" If it does, we have to clean up... | |
470 | */ | |
471 | if (copy_to_user((void __user *) | |
472 | (unsigned long) ti->tidlist, | |
473 | tidlist, cnt * sizeof(*tidlist))) { | |
474 | ret = -EFAULT; | |
475 | goto cleanup; | |
476 | } | |
477 | if (copy_to_user((void __user *) (unsigned long) ti->tidmap, | |
478 | tidmap, sizeof tidmap)) { | |
479 | ret = -EFAULT; | |
480 | goto cleanup; | |
481 | } | |
482 | if (tid == tidcnt) | |
483 | tid = 0; | |
9929b0fb BS |
484 | if (!pd->port_subport_cnt) |
485 | pd->port_tidcursor = tid; | |
486 | else | |
487 | tidcursor_fp(fp) = tid; | |
7f510b46 BS |
488 | } |
489 | ||
490 | done: | |
491 | if (ret) | |
492 | ipath_dbg("Failed to map %u TID pages, failing with %d\n", | |
493 | ti->tidcnt, -ret); | |
494 | return ret; | |
495 | } | |
496 | ||
497 | /** | |
498 | * ipath_tid_free - free a port TID | |
499 | * @pd: the port | |
9929b0fb | 500 | * @subport: the subport |
7f510b46 BS |
501 | * @ti: the TID info |
502 | * | |
503 | * right now we are unlocking one page at a time, but since | |
504 | * the intended use of this routine is for a single group of | |
505 | * virtually contiguous pages, that should change to improve | |
506 | * performance. We check that the TID is in range for this port | |
507 | * but otherwise don't check validity; if user has an error and | |
508 | * frees the wrong tid, it's only their own data that can thereby | |
509 | * be corrupted. We do check that the TID was in use, for sanity | |
510 | * We always use our idea of the saved address, not the address that | |
511 | * they pass in to us. | |
512 | */ | |
513 | ||
9929b0fb | 514 | static int ipath_tid_free(struct ipath_portdata *pd, unsigned subport, |
7f510b46 BS |
515 | const struct ipath_tid_info *ti) |
516 | { | |
517 | int ret = 0; | |
518 | u32 tid, porttid, cnt, limit, tidcnt; | |
519 | struct ipath_devdata *dd = pd->port_dd; | |
520 | u64 __iomem *tidbase; | |
521 | unsigned long tidmap[8]; | |
522 | ||
523 | if (!dd->ipath_pageshadow) { | |
524 | ret = -ENOMEM; | |
525 | goto done; | |
526 | } | |
527 | ||
528 | if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap, | |
529 | sizeof tidmap)) { | |
530 | ret = -EFAULT; | |
531 | goto done; | |
532 | } | |
533 | ||
534 | porttid = pd->port_port * dd->ipath_rcvtidcnt; | |
9929b0fb BS |
535 | if (!pd->port_subport_cnt) |
536 | tidcnt = dd->ipath_rcvtidcnt; | |
537 | else if (!subport) { | |
538 | tidcnt = (dd->ipath_rcvtidcnt / pd->port_subport_cnt) + | |
539 | (dd->ipath_rcvtidcnt % pd->port_subport_cnt); | |
540 | porttid += dd->ipath_rcvtidcnt - tidcnt; | |
541 | } else { | |
542 | tidcnt = dd->ipath_rcvtidcnt / pd->port_subport_cnt; | |
543 | porttid += tidcnt * (subport - 1); | |
544 | } | |
7f510b46 BS |
545 | tidbase = (u64 __iomem *) ((char __iomem *)(dd->ipath_kregbase) + |
546 | dd->ipath_rcvtidbase + | |
547 | porttid * sizeof(*tidbase)); | |
548 | ||
7f510b46 BS |
549 | limit = sizeof(tidmap) * BITS_PER_BYTE; |
550 | if (limit > tidcnt) | |
551 | /* just in case size changes in future */ | |
552 | limit = tidcnt; | |
553 | tid = find_first_bit(tidmap, limit); | |
554 | ipath_cdbg(VERBOSE, "Port%u free %u tids; first bit (max=%d) " | |
555 | "set is %d, porttid %u\n", pd->port_port, ti->tidcnt, | |
556 | limit, tid, porttid); | |
557 | for (cnt = 0; tid < limit; tid++) { | |
558 | /* | |
559 | * small optimization; if we detect a run of 3 or so without | |
560 | * any set, use find_first_bit again. That's mainly to | |
561 | * accelerate the case where we wrapped, so we have some at | |
562 | * the beginning, and some at the end, and a big gap | |
563 | * in the middle. | |
564 | */ | |
565 | if (!test_bit(tid, tidmap)) | |
566 | continue; | |
567 | cnt++; | |
568 | if (dd->ipath_pageshadow[porttid + tid]) { | |
3ac8c70f DO |
569 | struct page *p; |
570 | p = dd->ipath_pageshadow[porttid + tid]; | |
571 | dd->ipath_pageshadow[porttid + tid] = NULL; | |
7f510b46 BS |
572 | ipath_cdbg(VERBOSE, "PID %u freeing TID %u\n", |
573 | pd->port_pid, tid); | |
f716cdfe JE |
574 | dd->ipath_f_put_tid(dd, &tidbase[tid], |
575 | RCVHQ_RCV_TYPE_EXPECTED, | |
7f510b46 | 576 | dd->ipath_tidinvalid); |
1fd3b40f BS |
577 | pci_unmap_page(dd->pcidev, |
578 | dd->ipath_physshadow[porttid + tid], | |
579 | PAGE_SIZE, PCI_DMA_FROMDEVICE); | |
3ac8c70f | 580 | ipath_release_user_pages(&p, 1); |
7f510b46 BS |
581 | ipath_stats.sps_pageunlocks++; |
582 | } else | |
583 | ipath_dbg("Unused tid %u, ignoring\n", tid); | |
584 | } | |
585 | if (cnt != ti->tidcnt) | |
586 | ipath_dbg("passed in tidcnt %d, only %d bits set in map\n", | |
587 | ti->tidcnt, cnt); | |
588 | done: | |
589 | if (ret) | |
590 | ipath_dbg("Failed to unmap %u TID pages, failing with %d\n", | |
591 | ti->tidcnt, -ret); | |
592 | return ret; | |
593 | } | |
594 | ||
595 | /** | |
596 | * ipath_set_part_key - set a partition key | |
597 | * @pd: the port | |
598 | * @key: the key | |
599 | * | |
600 | * We can have up to 4 active at a time (other than the default, which is | |
601 | * always allowed). This is somewhat tricky, since multiple ports may set | |
602 | * the same key, so we reference count them, and clean up at exit. All 4 | |
603 | * partition keys are packed into a single infinipath register. It's an | |
604 | * error for a process to set the same pkey multiple times. We provide no | |
605 | * mechanism to de-allocate a pkey at this time, we may eventually need to | |
606 | * do that. I've used the atomic operations, and no locking, and only make | |
607 | * a single pass through what's available. This should be more than | |
608 | * adequate for some time. I'll think about spinlocks or the like if and as | |
609 | * it's necessary. | |
610 | */ | |
611 | static int ipath_set_part_key(struct ipath_portdata *pd, u16 key) | |
612 | { | |
613 | struct ipath_devdata *dd = pd->port_dd; | |
614 | int i, any = 0, pidx = -1; | |
615 | u16 lkey = key & 0x7FFF; | |
616 | int ret; | |
617 | ||
27b678dd | 618 | if (lkey == (IPATH_DEFAULT_P_KEY & 0x7FFF)) { |
7f510b46 BS |
619 | /* nothing to do; this key always valid */ |
620 | ret = 0; | |
621 | goto bail; | |
622 | } | |
623 | ||
624 | ipath_cdbg(VERBOSE, "p%u try to set pkey %hx, current keys " | |
625 | "%hx:%x %hx:%x %hx:%x %hx:%x\n", | |
626 | pd->port_port, key, dd->ipath_pkeys[0], | |
627 | atomic_read(&dd->ipath_pkeyrefs[0]), dd->ipath_pkeys[1], | |
628 | atomic_read(&dd->ipath_pkeyrefs[1]), dd->ipath_pkeys[2], | |
629 | atomic_read(&dd->ipath_pkeyrefs[2]), dd->ipath_pkeys[3], | |
630 | atomic_read(&dd->ipath_pkeyrefs[3])); | |
631 | ||
632 | if (!lkey) { | |
633 | ipath_cdbg(PROC, "p%u tries to set key 0, not allowed\n", | |
634 | pd->port_port); | |
635 | ret = -EINVAL; | |
636 | goto bail; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Set the full membership bit, because it has to be | |
641 | * set in the register or the packet, and it seems | |
642 | * cleaner to set in the register than to force all | |
643 | * callers to set it. (see bug 4331) | |
644 | */ | |
645 | key |= 0x8000; | |
646 | ||
647 | for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) { | |
648 | if (!pd->port_pkeys[i] && pidx == -1) | |
649 | pidx = i; | |
650 | if (pd->port_pkeys[i] == key) { | |
651 | ipath_cdbg(VERBOSE, "p%u tries to set same pkey " | |
652 | "(%x) more than once\n", | |
653 | pd->port_port, key); | |
654 | ret = -EEXIST; | |
655 | goto bail; | |
656 | } | |
657 | } | |
658 | if (pidx == -1) { | |
659 | ipath_dbg("All pkeys for port %u already in use, " | |
660 | "can't set %x\n", pd->port_port, key); | |
661 | ret = -EBUSY; | |
662 | goto bail; | |
663 | } | |
664 | for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) { | |
665 | if (!dd->ipath_pkeys[i]) { | |
666 | any++; | |
667 | continue; | |
668 | } | |
669 | if (dd->ipath_pkeys[i] == key) { | |
670 | atomic_t *pkrefs = &dd->ipath_pkeyrefs[i]; | |
671 | ||
672 | if (atomic_inc_return(pkrefs) > 1) { | |
673 | pd->port_pkeys[pidx] = key; | |
674 | ipath_cdbg(VERBOSE, "p%u set key %x " | |
675 | "matches #%d, count now %d\n", | |
676 | pd->port_port, key, i, | |
677 | atomic_read(pkrefs)); | |
678 | ret = 0; | |
679 | goto bail; | |
680 | } else { | |
681 | /* | |
682 | * lost race, decrement count, catch below | |
683 | */ | |
684 | atomic_dec(pkrefs); | |
685 | ipath_cdbg(VERBOSE, "Lost race, count was " | |
686 | "0, after dec, it's %d\n", | |
687 | atomic_read(pkrefs)); | |
688 | any++; | |
689 | } | |
690 | } | |
691 | if ((dd->ipath_pkeys[i] & 0x7FFF) == lkey) { | |
692 | /* | |
693 | * It makes no sense to have both the limited and | |
694 | * full membership PKEY set at the same time since | |
695 | * the unlimited one will disable the limited one. | |
696 | */ | |
697 | ret = -EEXIST; | |
698 | goto bail; | |
699 | } | |
700 | } | |
701 | if (!any) { | |
702 | ipath_dbg("port %u, all pkeys already in use, " | |
703 | "can't set %x\n", pd->port_port, key); | |
704 | ret = -EBUSY; | |
705 | goto bail; | |
706 | } | |
707 | for (any = i = 0; i < ARRAY_SIZE(dd->ipath_pkeys); i++) { | |
708 | if (!dd->ipath_pkeys[i] && | |
709 | atomic_inc_return(&dd->ipath_pkeyrefs[i]) == 1) { | |
710 | u64 pkey; | |
711 | ||
712 | /* for ipathstats, etc. */ | |
713 | ipath_stats.sps_pkeys[i] = lkey; | |
714 | pd->port_pkeys[pidx] = dd->ipath_pkeys[i] = key; | |
715 | pkey = | |
716 | (u64) dd->ipath_pkeys[0] | | |
717 | ((u64) dd->ipath_pkeys[1] << 16) | | |
718 | ((u64) dd->ipath_pkeys[2] << 32) | | |
719 | ((u64) dd->ipath_pkeys[3] << 48); | |
720 | ipath_cdbg(PROC, "p%u set key %x in #%d, " | |
721 | "portidx %d, new pkey reg %llx\n", | |
722 | pd->port_port, key, i, pidx, | |
723 | (unsigned long long) pkey); | |
724 | ipath_write_kreg( | |
725 | dd, dd->ipath_kregs->kr_partitionkey, pkey); | |
726 | ||
727 | ret = 0; | |
728 | goto bail; | |
729 | } | |
730 | } | |
731 | ipath_dbg("port %u, all pkeys already in use 2nd pass, " | |
732 | "can't set %x\n", pd->port_port, key); | |
733 | ret = -EBUSY; | |
734 | ||
735 | bail: | |
736 | return ret; | |
737 | } | |
738 | ||
739 | /** | |
740 | * ipath_manage_rcvq - manage a port's receive queue | |
741 | * @pd: the port | |
9929b0fb | 742 | * @subport: the subport |
7f510b46 BS |
743 | * @start_stop: action to carry out |
744 | * | |
745 | * start_stop == 0 disables receive on the port, for use in queue | |
746 | * overflow conditions. start_stop==1 re-enables, to be used to | |
747 | * re-init the software copy of the head register | |
748 | */ | |
9929b0fb BS |
749 | static int ipath_manage_rcvq(struct ipath_portdata *pd, unsigned subport, |
750 | int start_stop) | |
7f510b46 BS |
751 | { |
752 | struct ipath_devdata *dd = pd->port_dd; | |
7f510b46 | 753 | |
9929b0fb | 754 | ipath_cdbg(PROC, "%sabling rcv for unit %u port %u:%u\n", |
7f510b46 | 755 | start_stop ? "en" : "dis", dd->ipath_unit, |
9929b0fb BS |
756 | pd->port_port, subport); |
757 | if (subport) | |
758 | goto bail; | |
7f510b46 BS |
759 | /* atomically clear receive enable port. */ |
760 | if (start_stop) { | |
761 | /* | |
762 | * On enable, force in-memory copy of the tail register to | |
763 | * 0, so that protocol code doesn't have to worry about | |
764 | * whether or not the chip has yet updated the in-memory | |
765 | * copy or not on return from the system call. The chip | |
766 | * always resets it's tail register back to 0 on a | |
767 | * transition from disabled to enabled. This could cause a | |
768 | * problem if software was broken, and did the enable w/o | |
769 | * the disable, but eventually the in-memory copy will be | |
770 | * updated and correct itself, even in the face of software | |
771 | * bugs. | |
772 | */ | |
c59a80ac RC |
773 | if (pd->port_rcvhdrtail_kvaddr) |
774 | ipath_clear_rcvhdrtail(pd); | |
d8274869 | 775 | set_bit(dd->ipath_r_portenable_shift + pd->port_port, |
7f510b46 BS |
776 | &dd->ipath_rcvctrl); |
777 | } else | |
d8274869 | 778 | clear_bit(dd->ipath_r_portenable_shift + pd->port_port, |
7f510b46 BS |
779 | &dd->ipath_rcvctrl); |
780 | ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, | |
781 | dd->ipath_rcvctrl); | |
782 | /* now be sure chip saw it before we return */ | |
44f8e3f3 | 783 | ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch); |
7f510b46 BS |
784 | if (start_stop) { |
785 | /* | |
786 | * And try to be sure that tail reg update has happened too. | |
787 | * This should in theory interlock with the RXE changes to | |
788 | * the tail register. Don't assign it to the tail register | |
789 | * in memory copy, since we could overwrite an update by the | |
790 | * chip if we did. | |
791 | */ | |
44f8e3f3 | 792 | ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port); |
7f510b46 BS |
793 | } |
794 | /* always; new head should be equal to new tail; see above */ | |
9929b0fb | 795 | bail: |
7f510b46 BS |
796 | return 0; |
797 | } | |
798 | ||
799 | static void ipath_clean_part_key(struct ipath_portdata *pd, | |
800 | struct ipath_devdata *dd) | |
801 | { | |
802 | int i, j, pchanged = 0; | |
803 | u64 oldpkey; | |
804 | ||
805 | /* for debugging only */ | |
806 | oldpkey = (u64) dd->ipath_pkeys[0] | | |
807 | ((u64) dd->ipath_pkeys[1] << 16) | | |
808 | ((u64) dd->ipath_pkeys[2] << 32) | | |
809 | ((u64) dd->ipath_pkeys[3] << 48); | |
810 | ||
811 | for (i = 0; i < ARRAY_SIZE(pd->port_pkeys); i++) { | |
812 | if (!pd->port_pkeys[i]) | |
813 | continue; | |
814 | ipath_cdbg(VERBOSE, "look for key[%d] %hx in pkeys\n", i, | |
815 | pd->port_pkeys[i]); | |
816 | for (j = 0; j < ARRAY_SIZE(dd->ipath_pkeys); j++) { | |
817 | /* check for match independent of the global bit */ | |
818 | if ((dd->ipath_pkeys[j] & 0x7fff) != | |
819 | (pd->port_pkeys[i] & 0x7fff)) | |
820 | continue; | |
821 | if (atomic_dec_and_test(&dd->ipath_pkeyrefs[j])) { | |
822 | ipath_cdbg(VERBOSE, "p%u clear key " | |
823 | "%x matches #%d\n", | |
824 | pd->port_port, | |
825 | pd->port_pkeys[i], j); | |
826 | ipath_stats.sps_pkeys[j] = | |
827 | dd->ipath_pkeys[j] = 0; | |
828 | pchanged++; | |
829 | } | |
830 | else ipath_cdbg( | |
831 | VERBOSE, "p%u key %x matches #%d, " | |
832 | "but ref still %d\n", pd->port_port, | |
833 | pd->port_pkeys[i], j, | |
834 | atomic_read(&dd->ipath_pkeyrefs[j])); | |
835 | break; | |
836 | } | |
837 | pd->port_pkeys[i] = 0; | |
838 | } | |
839 | if (pchanged) { | |
840 | u64 pkey = (u64) dd->ipath_pkeys[0] | | |
841 | ((u64) dd->ipath_pkeys[1] << 16) | | |
842 | ((u64) dd->ipath_pkeys[2] << 32) | | |
843 | ((u64) dd->ipath_pkeys[3] << 48); | |
844 | ipath_cdbg(VERBOSE, "p%u old pkey reg %llx, " | |
845 | "new pkey reg %llx\n", pd->port_port, | |
846 | (unsigned long long) oldpkey, | |
847 | (unsigned long long) pkey); | |
848 | ipath_write_kreg(dd, dd->ipath_kregs->kr_partitionkey, | |
849 | pkey); | |
850 | } | |
851 | } | |
852 | ||
9929b0fb BS |
853 | /* |
854 | * Initialize the port data with the receive buffer sizes | |
855 | * so this can be done while the master port is locked. | |
856 | * Otherwise, there is a race with a slave opening the port | |
857 | * and seeing these fields uninitialized. | |
858 | */ | |
859 | static void init_user_egr_sizes(struct ipath_portdata *pd) | |
860 | { | |
861 | struct ipath_devdata *dd = pd->port_dd; | |
862 | unsigned egrperchunk, egrcnt, size; | |
863 | ||
864 | /* | |
865 | * to avoid wasting a lot of memory, we allocate 32KB chunks of | |
866 | * physically contiguous memory, advance through it until used up | |
867 | * and then allocate more. Of course, we need memory to store those | |
868 | * extra pointers, now. Started out with 256KB, but under heavy | |
869 | * memory pressure (creating large files and then copying them over | |
870 | * NFS while doing lots of MPI jobs), we hit some allocation | |
871 | * failures, even though we can sleep... (2.6.10) Still get | |
872 | * failures at 64K. 32K is the lowest we can go without wasting | |
873 | * additional memory. | |
874 | */ | |
875 | size = 0x8000; | |
876 | egrperchunk = size / dd->ipath_rcvegrbufsize; | |
877 | egrcnt = dd->ipath_rcvegrcnt; | |
878 | pd->port_rcvegrbuf_chunks = (egrcnt + egrperchunk - 1) / egrperchunk; | |
879 | pd->port_rcvegrbufs_perchunk = egrperchunk; | |
880 | pd->port_rcvegrbuf_size = size; | |
881 | } | |
882 | ||
7f510b46 BS |
883 | /** |
884 | * ipath_create_user_egr - allocate eager TID buffers | |
885 | * @pd: the port to allocate TID buffers for | |
886 | * | |
887 | * This routine is now quite different for user and kernel, because | |
888 | * the kernel uses skb's, for the accelerated network performance | |
889 | * This is the user port version | |
890 | * | |
891 | * Allocate the eager TID buffers and program them into infinipath | |
892 | * They are no longer completely contiguous, we do multiple allocation | |
893 | * calls. | |
894 | */ | |
895 | static int ipath_create_user_egr(struct ipath_portdata *pd) | |
896 | { | |
897 | struct ipath_devdata *dd = pd->port_dd; | |
9929b0fb | 898 | unsigned e, egrcnt, egrperchunk, chunk, egrsize, egroff; |
7f510b46 BS |
899 | size_t size; |
900 | int ret; | |
0ed9a4a0 BS |
901 | gfp_t gfp_flags; |
902 | ||
903 | /* | |
904 | * GFP_USER, but without GFP_FS, so buffer cache can be | |
905 | * coalesced (we hope); otherwise, even at order 4, | |
906 | * heavy filesystem activity makes these fail, and we can | |
907 | * use compound pages. | |
908 | */ | |
909 | gfp_flags = __GFP_WAIT | __GFP_IO | __GFP_COMP; | |
7f510b46 BS |
910 | |
911 | egrcnt = dd->ipath_rcvegrcnt; | |
912 | /* TID number offset for this port */ | |
60948a41 | 913 | egroff = (pd->port_port - 1) * egrcnt + dd->ipath_p0_rcvegrcnt; |
7f510b46 BS |
914 | egrsize = dd->ipath_rcvegrbufsize; |
915 | ipath_cdbg(VERBOSE, "Allocating %d egr buffers, at egrtid " | |
916 | "offset %x, egrsize %u\n", egrcnt, egroff, egrsize); | |
917 | ||
9929b0fb BS |
918 | chunk = pd->port_rcvegrbuf_chunks; |
919 | egrperchunk = pd->port_rcvegrbufs_perchunk; | |
920 | size = pd->port_rcvegrbuf_size; | |
921 | pd->port_rcvegrbuf = kmalloc(chunk * sizeof(pd->port_rcvegrbuf[0]), | |
922 | GFP_KERNEL); | |
7f510b46 BS |
923 | if (!pd->port_rcvegrbuf) { |
924 | ret = -ENOMEM; | |
925 | goto bail; | |
926 | } | |
927 | pd->port_rcvegrbuf_phys = | |
9929b0fb BS |
928 | kmalloc(chunk * sizeof(pd->port_rcvegrbuf_phys[0]), |
929 | GFP_KERNEL); | |
7f510b46 BS |
930 | if (!pd->port_rcvegrbuf_phys) { |
931 | ret = -ENOMEM; | |
932 | goto bail_rcvegrbuf; | |
933 | } | |
934 | for (e = 0; e < pd->port_rcvegrbuf_chunks; e++) { | |
7f510b46 BS |
935 | |
936 | pd->port_rcvegrbuf[e] = dma_alloc_coherent( | |
937 | &dd->pcidev->dev, size, &pd->port_rcvegrbuf_phys[e], | |
938 | gfp_flags); | |
939 | ||
940 | if (!pd->port_rcvegrbuf[e]) { | |
941 | ret = -ENOMEM; | |
942 | goto bail_rcvegrbuf_phys; | |
943 | } | |
944 | } | |
945 | ||
946 | pd->port_rcvegr_phys = pd->port_rcvegrbuf_phys[0]; | |
947 | ||
948 | for (e = chunk = 0; chunk < pd->port_rcvegrbuf_chunks; chunk++) { | |
949 | dma_addr_t pa = pd->port_rcvegrbuf_phys[chunk]; | |
950 | unsigned i; | |
951 | ||
952 | for (i = 0; e < egrcnt && i < egrperchunk; e++, i++) { | |
953 | dd->ipath_f_put_tid(dd, e + egroff + | |
954 | (u64 __iomem *) | |
955 | ((char __iomem *) | |
956 | dd->ipath_kregbase + | |
f716cdfe JE |
957 | dd->ipath_rcvegrbase), |
958 | RCVHQ_RCV_TYPE_EAGER, pa); | |
7f510b46 BS |
959 | pa += egrsize; |
960 | } | |
961 | cond_resched(); /* don't hog the cpu */ | |
962 | } | |
963 | ||
964 | ret = 0; | |
965 | goto bail; | |
966 | ||
967 | bail_rcvegrbuf_phys: | |
968 | for (e = 0; e < pd->port_rcvegrbuf_chunks && | |
f37bda92 | 969 | pd->port_rcvegrbuf[e]; e++) { |
7f510b46 BS |
970 | dma_free_coherent(&dd->pcidev->dev, size, |
971 | pd->port_rcvegrbuf[e], | |
972 | pd->port_rcvegrbuf_phys[e]); | |
973 | ||
f37bda92 | 974 | } |
9929b0fb | 975 | kfree(pd->port_rcvegrbuf_phys); |
7f510b46 BS |
976 | pd->port_rcvegrbuf_phys = NULL; |
977 | bail_rcvegrbuf: | |
9929b0fb | 978 | kfree(pd->port_rcvegrbuf); |
7f510b46 BS |
979 | pd->port_rcvegrbuf = NULL; |
980 | bail: | |
981 | return ret; | |
982 | } | |
983 | ||
f37bda92 BS |
984 | |
985 | /* common code for the mappings on dma_alloc_coherent mem */ | |
986 | static int ipath_mmap_mem(struct vm_area_struct *vma, | |
1fd3b40f BS |
987 | struct ipath_portdata *pd, unsigned len, int write_ok, |
988 | void *kvaddr, char *what) | |
f37bda92 BS |
989 | { |
990 | struct ipath_devdata *dd = pd->port_dd; | |
1fd3b40f | 991 | unsigned long pfn; |
f37bda92 BS |
992 | int ret; |
993 | ||
994 | if ((vma->vm_end - vma->vm_start) > len) { | |
995 | dev_info(&dd->pcidev->dev, | |
996 | "FAIL on %s: len %lx > %x\n", what, | |
997 | vma->vm_end - vma->vm_start, len); | |
998 | ret = -EFAULT; | |
999 | goto bail; | |
1000 | } | |
1001 | ||
1002 | if (!write_ok) { | |
1003 | if (vma->vm_flags & VM_WRITE) { | |
1004 | dev_info(&dd->pcidev->dev, | |
1005 | "%s must be mapped readonly\n", what); | |
1006 | ret = -EPERM; | |
1007 | goto bail; | |
1008 | } | |
1009 | ||
1010 | /* don't allow them to later change with mprotect */ | |
1011 | vma->vm_flags &= ~VM_MAYWRITE; | |
1012 | } | |
1013 | ||
1fd3b40f | 1014 | pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT; |
f37bda92 BS |
1015 | ret = remap_pfn_range(vma, vma->vm_start, pfn, |
1016 | len, vma->vm_page_prot); | |
1017 | if (ret) | |
1fd3b40f BS |
1018 | dev_info(&dd->pcidev->dev, "%s port%u mmap of %lx, %x " |
1019 | "bytes r%c failed: %d\n", what, pd->port_port, | |
1020 | pfn, len, write_ok?'w':'o', ret); | |
f37bda92 | 1021 | else |
1fd3b40f BS |
1022 | ipath_cdbg(VERBOSE, "%s port%u mmaped %lx, %x bytes " |
1023 | "r%c\n", what, pd->port_port, pfn, len, | |
1024 | write_ok?'w':'o'); | |
f37bda92 BS |
1025 | bail: |
1026 | return ret; | |
1027 | } | |
1028 | ||
7f510b46 BS |
1029 | static int mmap_ureg(struct vm_area_struct *vma, struct ipath_devdata *dd, |
1030 | u64 ureg) | |
1031 | { | |
1032 | unsigned long phys; | |
1033 | int ret; | |
1034 | ||
f37bda92 BS |
1035 | /* |
1036 | * This is real hardware, so use io_remap. This is the mechanism | |
1037 | * for the user process to update the head registers for their port | |
1038 | * in the chip. | |
1039 | */ | |
7f510b46 BS |
1040 | if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) { |
1041 | dev_info(&dd->pcidev->dev, "FAIL mmap userreg: reqlen " | |
1042 | "%lx > PAGE\n", vma->vm_end - vma->vm_start); | |
1043 | ret = -EFAULT; | |
1044 | } else { | |
1045 | phys = dd->ipath_physaddr + ureg; | |
1046 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
1047 | ||
1048 | vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; | |
1049 | ret = io_remap_pfn_range(vma, vma->vm_start, | |
1050 | phys >> PAGE_SHIFT, | |
1051 | vma->vm_end - vma->vm_start, | |
1052 | vma->vm_page_prot); | |
1053 | } | |
1054 | return ret; | |
1055 | } | |
1056 | ||
1057 | static int mmap_piobufs(struct vm_area_struct *vma, | |
1058 | struct ipath_devdata *dd, | |
9929b0fb BS |
1059 | struct ipath_portdata *pd, |
1060 | unsigned piobufs, unsigned piocnt) | |
7f510b46 BS |
1061 | { |
1062 | unsigned long phys; | |
1063 | int ret; | |
1064 | ||
1065 | /* | |
f37bda92 BS |
1066 | * When we map the PIO buffers in the chip, we want to map them as |
1067 | * writeonly, no read possible. This prevents access to previous | |
1068 | * process data, and catches users who might try to read the i/o | |
1069 | * space due to a bug. | |
7f510b46 | 1070 | */ |
9929b0fb | 1071 | if ((vma->vm_end - vma->vm_start) > (piocnt * dd->ipath_palign)) { |
7f510b46 BS |
1072 | dev_info(&dd->pcidev->dev, "FAIL mmap piobufs: " |
1073 | "reqlen %lx > PAGE\n", | |
1074 | vma->vm_end - vma->vm_start); | |
9929b0fb | 1075 | ret = -EINVAL; |
7f510b46 BS |
1076 | goto bail; |
1077 | } | |
1078 | ||
9929b0fb | 1079 | phys = dd->ipath_physaddr + piobufs; |
f37bda92 | 1080 | |
eb9dc6f4 BS |
1081 | #if defined(__powerpc__) |
1082 | /* There isn't a generic way to specify writethrough mappings */ | |
1083 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; | |
1084 | pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU; | |
1085 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED; | |
1086 | #endif | |
1087 | ||
367fe711 BS |
1088 | /* |
1089 | * don't allow them to later change to readable with mprotect (for when | |
1090 | * not initially mapped readable, as is normally the case) | |
1091 | */ | |
f37bda92 | 1092 | vma->vm_flags &= ~VM_MAYREAD; |
7f510b46 BS |
1093 | vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; |
1094 | ||
1095 | ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT, | |
1096 | vma->vm_end - vma->vm_start, | |
1097 | vma->vm_page_prot); | |
1098 | bail: | |
1099 | return ret; | |
1100 | } | |
1101 | ||
1102 | static int mmap_rcvegrbufs(struct vm_area_struct *vma, | |
1103 | struct ipath_portdata *pd) | |
1104 | { | |
1105 | struct ipath_devdata *dd = pd->port_dd; | |
1106 | unsigned long start, size; | |
1107 | size_t total_size, i; | |
1fd3b40f | 1108 | unsigned long pfn; |
7f510b46 BS |
1109 | int ret; |
1110 | ||
7f510b46 BS |
1111 | size = pd->port_rcvegrbuf_size; |
1112 | total_size = pd->port_rcvegrbuf_chunks * size; | |
1113 | if ((vma->vm_end - vma->vm_start) > total_size) { | |
1114 | dev_info(&dd->pcidev->dev, "FAIL on egr bufs: " | |
1115 | "reqlen %lx > actual %lx\n", | |
1116 | vma->vm_end - vma->vm_start, | |
1117 | (unsigned long) total_size); | |
9929b0fb | 1118 | ret = -EINVAL; |
7f510b46 BS |
1119 | goto bail; |
1120 | } | |
1121 | ||
1122 | if (vma->vm_flags & VM_WRITE) { | |
1123 | dev_info(&dd->pcidev->dev, "Can't map eager buffers as " | |
1124 | "writable (flags=%lx)\n", vma->vm_flags); | |
1125 | ret = -EPERM; | |
1126 | goto bail; | |
1127 | } | |
f37bda92 BS |
1128 | /* don't allow them to later change to writeable with mprotect */ |
1129 | vma->vm_flags &= ~VM_MAYWRITE; | |
7f510b46 BS |
1130 | |
1131 | start = vma->vm_start; | |
7f510b46 | 1132 | |
7f510b46 | 1133 | for (i = 0; i < pd->port_rcvegrbuf_chunks; i++, start += size) { |
1fd3b40f BS |
1134 | pfn = virt_to_phys(pd->port_rcvegrbuf[i]) >> PAGE_SHIFT; |
1135 | ret = remap_pfn_range(vma, start, pfn, size, | |
1136 | vma->vm_page_prot); | |
7f510b46 BS |
1137 | if (ret < 0) |
1138 | goto bail; | |
1139 | } | |
1140 | ret = 0; | |
1141 | ||
1142 | bail: | |
1143 | return ret; | |
1144 | } | |
1145 | ||
9929b0fb | 1146 | /* |
3c845086 | 1147 | * ipath_file_vma_fault - handle a VMA page fault. |
9929b0fb | 1148 | */ |
3c845086 NP |
1149 | static int ipath_file_vma_fault(struct vm_area_struct *vma, |
1150 | struct vm_fault *vmf) | |
9929b0fb | 1151 | { |
3c845086 | 1152 | struct page *page; |
9929b0fb | 1153 | |
3c845086 | 1154 | page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT)); |
9929b0fb | 1155 | if (!page) |
3c845086 | 1156 | return VM_FAULT_SIGBUS; |
9929b0fb | 1157 | get_page(page); |
3c845086 NP |
1158 | vmf->page = page; |
1159 | ||
1160 | return 0; | |
9929b0fb BS |
1161 | } |
1162 | ||
1163 | static struct vm_operations_struct ipath_file_vm_ops = { | |
3c845086 | 1164 | .fault = ipath_file_vma_fault, |
9929b0fb BS |
1165 | }; |
1166 | ||
1167 | static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr, | |
1168 | struct ipath_portdata *pd, unsigned subport) | |
1169 | { | |
1170 | unsigned long len; | |
1171 | struct ipath_devdata *dd; | |
1172 | void *addr; | |
1173 | size_t size; | |
0a5a83cf | 1174 | int ret = 0; |
9929b0fb BS |
1175 | |
1176 | /* If the port is not shared, all addresses should be physical */ | |
0a5a83cf | 1177 | if (!pd->port_subport_cnt) |
9929b0fb | 1178 | goto bail; |
9929b0fb BS |
1179 | |
1180 | dd = pd->port_dd; | |
1181 | size = pd->port_rcvegrbuf_chunks * pd->port_rcvegrbuf_size; | |
1182 | ||
1183 | /* | |
c7e29ff1 MD |
1184 | * Each process has all the subport uregbase, rcvhdrq, and |
1185 | * rcvegrbufs mmapped - as an array for all the processes, | |
1186 | * and also separately for this process. | |
9929b0fb | 1187 | */ |
c7e29ff1 MD |
1188 | if (pgaddr == cvt_kvaddr(pd->subport_uregbase)) { |
1189 | addr = pd->subport_uregbase; | |
1190 | size = PAGE_SIZE * pd->port_subport_cnt; | |
1191 | } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base)) { | |
1192 | addr = pd->subport_rcvhdr_base; | |
1193 | size = pd->port_rcvhdrq_size * pd->port_subport_cnt; | |
1194 | } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf)) { | |
1195 | addr = pd->subport_rcvegrbuf; | |
1196 | size *= pd->port_subport_cnt; | |
1197 | } else if (pgaddr == cvt_kvaddr(pd->subport_uregbase + | |
1198 | PAGE_SIZE * subport)) { | |
1199 | addr = pd->subport_uregbase + PAGE_SIZE * subport; | |
1200 | size = PAGE_SIZE; | |
1201 | } else if (pgaddr == cvt_kvaddr(pd->subport_rcvhdr_base + | |
1202 | pd->port_rcvhdrq_size * subport)) { | |
1203 | addr = pd->subport_rcvhdr_base + | |
1204 | pd->port_rcvhdrq_size * subport; | |
1205 | size = pd->port_rcvhdrq_size; | |
1206 | } else if (pgaddr == cvt_kvaddr(pd->subport_rcvegrbuf + | |
1207 | size * subport)) { | |
1208 | addr = pd->subport_rcvegrbuf + size * subport; | |
1209 | /* rcvegrbufs are read-only on the slave */ | |
1210 | if (vma->vm_flags & VM_WRITE) { | |
1211 | dev_info(&dd->pcidev->dev, | |
1212 | "Can't map eager buffers as " | |
1213 | "writable (flags=%lx)\n", vma->vm_flags); | |
1214 | ret = -EPERM; | |
1215 | goto bail; | |
1216 | } | |
1217 | /* | |
1218 | * Don't allow permission to later change to writeable | |
1219 | * with mprotect. | |
1220 | */ | |
1221 | vma->vm_flags &= ~VM_MAYWRITE; | |
1222 | } else { | |
9929b0fb | 1223 | goto bail; |
c7e29ff1 | 1224 | } |
9929b0fb BS |
1225 | len = vma->vm_end - vma->vm_start; |
1226 | if (len > size) { | |
1227 | ipath_cdbg(MM, "FAIL: reqlen %lx > %zx\n", len, size); | |
1228 | ret = -EINVAL; | |
1229 | goto bail; | |
1230 | } | |
1231 | ||
1232 | vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT; | |
1233 | vma->vm_ops = &ipath_file_vm_ops; | |
1234 | vma->vm_flags |= VM_RESERVED | VM_DONTEXPAND; | |
0a5a83cf | 1235 | ret = 1; |
9929b0fb BS |
1236 | |
1237 | bail: | |
1238 | return ret; | |
1239 | } | |
1240 | ||
7f510b46 BS |
1241 | /** |
1242 | * ipath_mmap - mmap various structures into user space | |
1243 | * @fp: the file pointer | |
1244 | * @vma: the VM area | |
1245 | * | |
1246 | * We use this to have a shared buffer between the kernel and the user code | |
1247 | * for the rcvhdr queue, egr buffers, and the per-port user regs and pio | |
1248 | * buffers in the chip. We have the open and close entries so we can bump | |
1249 | * the ref count and keep the driver from being unloaded while still mapped. | |
1250 | */ | |
1251 | static int ipath_mmap(struct file *fp, struct vm_area_struct *vma) | |
1252 | { | |
1253 | struct ipath_portdata *pd; | |
1254 | struct ipath_devdata *dd; | |
1255 | u64 pgaddr, ureg; | |
9929b0fb | 1256 | unsigned piobufs, piocnt; |
7f510b46 BS |
1257 | int ret; |
1258 | ||
1259 | pd = port_fp(fp); | |
9929b0fb BS |
1260 | if (!pd) { |
1261 | ret = -EINVAL; | |
1262 | goto bail; | |
1263 | } | |
7f510b46 | 1264 | dd = pd->port_dd; |
f37bda92 | 1265 | |
7f510b46 BS |
1266 | /* |
1267 | * This is the ipath_do_user_init() code, mapping the shared buffers | |
1268 | * into the user process. The address referred to by vm_pgoff is the | |
9929b0fb BS |
1269 | * file offset passed via mmap(). For shared ports, this is the |
1270 | * kernel vmalloc() address of the pages to share with the master. | |
1271 | * For non-shared or master ports, this is a physical address. | |
1272 | * We only do one mmap for each space mapped. | |
7f510b46 BS |
1273 | */ |
1274 | pgaddr = vma->vm_pgoff << PAGE_SHIFT; | |
1275 | ||
1276 | /* | |
9929b0fb BS |
1277 | * Check for 0 in case one of the allocations failed, but user |
1278 | * called mmap anyway. | |
7f510b46 | 1279 | */ |
9929b0fb BS |
1280 | if (!pgaddr) { |
1281 | ret = -EINVAL; | |
1282 | goto bail; | |
f37bda92 | 1283 | } |
7f510b46 | 1284 | |
9929b0fb | 1285 | ipath_cdbg(MM, "pgaddr %llx vm_start=%lx len %lx port %u:%u:%u\n", |
7f510b46 | 1286 | (unsigned long long) pgaddr, vma->vm_start, |
9929b0fb BS |
1287 | vma->vm_end - vma->vm_start, dd->ipath_unit, |
1288 | pd->port_port, subport_fp(fp)); | |
7f510b46 | 1289 | |
9929b0fb BS |
1290 | /* |
1291 | * Physical addresses must fit in 40 bits for our hardware. | |
1292 | * Check for kernel virtual addresses first, anything else must | |
1293 | * match a HW or memory address. | |
1294 | */ | |
0a5a83cf RC |
1295 | ret = mmap_kvaddr(vma, pgaddr, pd, subport_fp(fp)); |
1296 | if (ret) { | |
1297 | if (ret > 0) | |
1298 | ret = 0; | |
9929b0fb BS |
1299 | goto bail; |
1300 | } | |
1301 | ||
a18e26ae | 1302 | ureg = dd->ipath_uregbase + dd->ipath_ureg_align * pd->port_port; |
9929b0fb BS |
1303 | if (!pd->port_subport_cnt) { |
1304 | /* port is not shared */ | |
9929b0fb BS |
1305 | piocnt = dd->ipath_pbufsport; |
1306 | piobufs = pd->port_piobufs; | |
1307 | } else if (!subport_fp(fp)) { | |
1308 | /* caller is the master */ | |
9929b0fb BS |
1309 | piocnt = (dd->ipath_pbufsport / pd->port_subport_cnt) + |
1310 | (dd->ipath_pbufsport % pd->port_subport_cnt); | |
1311 | piobufs = pd->port_piobufs + | |
1312 | dd->ipath_palign * (dd->ipath_pbufsport - piocnt); | |
1313 | } else { | |
1314 | unsigned slave = subport_fp(fp) - 1; | |
1315 | ||
1316 | /* caller is a slave */ | |
9929b0fb BS |
1317 | piocnt = dd->ipath_pbufsport / pd->port_subport_cnt; |
1318 | piobufs = pd->port_piobufs + dd->ipath_palign * piocnt * slave; | |
f37bda92 | 1319 | } |
9929b0fb BS |
1320 | |
1321 | if (pgaddr == ureg) | |
7f510b46 | 1322 | ret = mmap_ureg(vma, dd, ureg); |
9929b0fb BS |
1323 | else if (pgaddr == piobufs) |
1324 | ret = mmap_piobufs(vma, dd, pd, piobufs, piocnt); | |
1325 | else if (pgaddr == dd->ipath_pioavailregs_phys) | |
1326 | /* in-memory copy of pioavail registers */ | |
1327 | ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0, | |
1fd3b40f | 1328 | (void *) dd->ipath_pioavailregs_dma, |
9929b0fb | 1329 | "pioavail registers"); |
9929b0fb | 1330 | else if (pgaddr == pd->port_rcvegr_phys) |
7f510b46 | 1331 | ret = mmap_rcvegrbufs(vma, pd); |
9929b0fb | 1332 | else if (pgaddr == (u64) pd->port_rcvhdrq_phys) |
f37bda92 | 1333 | /* |
525d0ca1 | 1334 | * The rcvhdrq itself; readonly except on HT (so have |
f37bda92 BS |
1335 | * to allow writable mapping), multiple pages, contiguous |
1336 | * from an i/o perspective. | |
1337 | */ | |
9929b0fb | 1338 | ret = ipath_mmap_mem(vma, pd, pd->port_rcvhdrq_size, 1, |
1fd3b40f | 1339 | pd->port_rcvhdrq, |
f37bda92 | 1340 | "rcvhdrq"); |
9929b0fb | 1341 | else if (pgaddr == (u64) pd->port_rcvhdrqtailaddr_phys) |
f37bda92 BS |
1342 | /* in-memory copy of rcvhdrq tail register */ |
1343 | ret = ipath_mmap_mem(vma, pd, PAGE_SIZE, 0, | |
1fd3b40f | 1344 | pd->port_rcvhdrtail_kvaddr, |
f37bda92 | 1345 | "rcvhdrq tail"); |
7f510b46 BS |
1346 | else |
1347 | ret = -EINVAL; | |
1348 | ||
1349 | vma->vm_private_data = NULL; | |
1350 | ||
1351 | if (ret < 0) | |
1352 | dev_info(&dd->pcidev->dev, | |
9929b0fb BS |
1353 | "Failure %d on off %llx len %lx\n", |
1354 | -ret, (unsigned long long)pgaddr, | |
1355 | vma->vm_end - vma->vm_start); | |
1356 | bail: | |
7f510b46 BS |
1357 | return ret; |
1358 | } | |
1359 | ||
70c51da2 AJ |
1360 | static unsigned ipath_poll_hdrqfull(struct ipath_portdata *pd) |
1361 | { | |
1362 | unsigned pollflag = 0; | |
1363 | ||
1364 | if ((pd->poll_type & IPATH_POLL_TYPE_OVERFLOW) && | |
1365 | pd->port_hdrqfull != pd->port_hdrqfull_poll) { | |
1366 | pollflag |= POLLIN | POLLRDNORM; | |
1367 | pd->port_hdrqfull_poll = pd->port_hdrqfull; | |
1368 | } | |
1369 | ||
1370 | return pollflag; | |
1371 | } | |
1372 | ||
f2d04231 RW |
1373 | static unsigned int ipath_poll_urgent(struct ipath_portdata *pd, |
1374 | struct file *fp, | |
1375 | struct poll_table_struct *pt) | |
7f510b46 | 1376 | { |
e35d710d | 1377 | unsigned pollflag = 0; |
7f510b46 BS |
1378 | struct ipath_devdata *dd; |
1379 | ||
7f510b46 BS |
1380 | dd = pd->port_dd; |
1381 | ||
70c51da2 AJ |
1382 | /* variable access in ipath_poll_hdrqfull() needs this */ |
1383 | rmb(); | |
1384 | pollflag = ipath_poll_hdrqfull(pd); | |
7f510b46 | 1385 | |
70c51da2 | 1386 | if (pd->port_urgent != pd->port_urgent_poll) { |
f2d04231 | 1387 | pollflag |= POLLIN | POLLRDNORM; |
70c51da2 | 1388 | pd->port_urgent_poll = pd->port_urgent; |
f2d04231 | 1389 | } |
7f510b46 | 1390 | |
f2d04231 | 1391 | if (!pollflag) { |
70c51da2 | 1392 | /* this saves a spin_lock/unlock in interrupt handler... */ |
f2d04231 | 1393 | set_bit(IPATH_PORT_WAITING_URG, &pd->port_flag); |
70c51da2 AJ |
1394 | /* flush waiting flag so don't miss an event... */ |
1395 | wmb(); | |
f2d04231 RW |
1396 | poll_wait(fp, &pd->port_wait, pt); |
1397 | } | |
1398 | ||
1399 | return pollflag; | |
1400 | } | |
1401 | ||
1402 | static unsigned int ipath_poll_next(struct ipath_portdata *pd, | |
1403 | struct file *fp, | |
1404 | struct poll_table_struct *pt) | |
1405 | { | |
70c51da2 AJ |
1406 | u32 head; |
1407 | u32 tail; | |
f2d04231 RW |
1408 | unsigned pollflag = 0; |
1409 | struct ipath_devdata *dd; | |
1410 | ||
1411 | dd = pd->port_dd; | |
7f510b46 | 1412 | |
70c51da2 AJ |
1413 | /* variable access in ipath_poll_hdrqfull() needs this */ |
1414 | rmb(); | |
1415 | pollflag = ipath_poll_hdrqfull(pd); | |
1416 | ||
7f510b46 | 1417 | head = ipath_read_ureg32(dd, ur_rcvhdrhead, pd->port_port); |
c59a80ac RC |
1418 | if (pd->port_rcvhdrtail_kvaddr) |
1419 | tail = ipath_get_rcvhdrtail(pd); | |
1420 | else | |
1421 | tail = ipath_read_ureg32(dd, ur_rcvhdrtail, pd->port_port); | |
f2d04231 | 1422 | |
70c51da2 | 1423 | if (head != tail) |
f2d04231 | 1424 | pollflag |= POLLIN | POLLRDNORM; |
70c51da2 AJ |
1425 | else { |
1426 | /* this saves a spin_lock/unlock in interrupt handler */ | |
7f510b46 | 1427 | set_bit(IPATH_PORT_WAITING_RCV, &pd->port_flag); |
70c51da2 AJ |
1428 | /* flush waiting flag so we don't miss an event */ |
1429 | wmb(); | |
f2d04231 | 1430 | |
d8274869 | 1431 | set_bit(pd->port_port + dd->ipath_r_intravail_shift, |
f2d04231 RW |
1432 | &dd->ipath_rcvctrl); |
1433 | ||
1434 | ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, | |
1435 | dd->ipath_rcvctrl); | |
1436 | ||
9929b0fb | 1437 | if (dd->ipath_rhdrhead_intr_off) /* arm rcv interrupt */ |
f2d04231 RW |
1438 | ipath_write_ureg(dd, ur_rcvhdrhead, |
1439 | dd->ipath_rhdrhead_intr_off | head, | |
1440 | pd->port_port); | |
7f510b46 | 1441 | |
f2d04231 | 1442 | poll_wait(fp, &pd->port_wait, pt); |
7f510b46 BS |
1443 | } |
1444 | ||
f2d04231 RW |
1445 | return pollflag; |
1446 | } | |
1447 | ||
1448 | static unsigned int ipath_poll(struct file *fp, | |
1449 | struct poll_table_struct *pt) | |
1450 | { | |
1451 | struct ipath_portdata *pd; | |
1452 | unsigned pollflag; | |
1453 | ||
1454 | pd = port_fp(fp); | |
1455 | if (!pd) | |
1456 | pollflag = 0; | |
1457 | else if (pd->poll_type & IPATH_POLL_TYPE_URGENT) | |
1458 | pollflag = ipath_poll_urgent(pd, fp, pt); | |
1459 | else | |
1460 | pollflag = ipath_poll_next(pd, fp, pt); | |
7f510b46 | 1461 | |
e35d710d | 1462 | return pollflag; |
7f510b46 BS |
1463 | } |
1464 | ||
0df6291c MD |
1465 | static int ipath_supports_subports(int user_swmajor, int user_swminor) |
1466 | { | |
1467 | /* no subport implementation prior to software version 1.3 */ | |
1468 | return (user_swmajor > 1) || (user_swminor >= 3); | |
1469 | } | |
1470 | ||
1471 | static int ipath_compatible_subports(int user_swmajor, int user_swminor) | |
1472 | { | |
1473 | /* this code is written long-hand for clarity */ | |
1474 | if (IPATH_USER_SWMAJOR != user_swmajor) { | |
1475 | /* no promise of compatibility if major mismatch */ | |
1476 | return 0; | |
1477 | } | |
1478 | if (IPATH_USER_SWMAJOR == 1) { | |
1479 | switch (IPATH_USER_SWMINOR) { | |
1480 | case 0: | |
1481 | case 1: | |
1482 | case 2: | |
1483 | /* no subport implementation so cannot be compatible */ | |
1484 | return 0; | |
1485 | case 3: | |
1486 | /* 3 is only compatible with itself */ | |
1487 | return user_swminor == 3; | |
1488 | default: | |
1489 | /* >= 4 are compatible (or are expected to be) */ | |
1490 | return user_swminor >= 4; | |
1491 | } | |
1492 | } | |
1493 | /* make no promises yet for future major versions */ | |
1494 | return 0; | |
1495 | } | |
1496 | ||
9929b0fb BS |
1497 | static int init_subports(struct ipath_devdata *dd, |
1498 | struct ipath_portdata *pd, | |
1499 | const struct ipath_user_info *uinfo) | |
1500 | { | |
1501 | int ret = 0; | |
c7e29ff1 | 1502 | unsigned num_subports; |
9929b0fb BS |
1503 | size_t size; |
1504 | ||
9929b0fb | 1505 | /* |
bacf4013 | 1506 | * If the user is requesting zero subports, |
9929b0fb BS |
1507 | * skip the subport allocation. |
1508 | */ | |
bacf4013 | 1509 | if (uinfo->spu_subport_cnt <= 0) |
9929b0fb | 1510 | goto bail; |
c7e29ff1 | 1511 | |
0df6291c MD |
1512 | /* Self-consistency check for ipath_compatible_subports() */ |
1513 | if (ipath_supports_subports(IPATH_USER_SWMAJOR, IPATH_USER_SWMINOR) && | |
1514 | !ipath_compatible_subports(IPATH_USER_SWMAJOR, | |
1515 | IPATH_USER_SWMINOR)) { | |
c7e29ff1 | 1516 | dev_info(&dd->pcidev->dev, |
0df6291c MD |
1517 | "Inconsistent ipath_compatible_subports()\n"); |
1518 | goto bail; | |
1519 | } | |
1520 | ||
1521 | /* Check for subport compatibility */ | |
1522 | if (!ipath_compatible_subports(uinfo->spu_userversion >> 16, | |
1523 | uinfo->spu_userversion & 0xffff)) { | |
1524 | dev_info(&dd->pcidev->dev, | |
1525 | "Mismatched user version (%d.%d) and driver " | |
1526 | "version (%d.%d) while port sharing. Ensure " | |
c7e29ff1 MD |
1527 | "that driver and library are from the same " |
1528 | "release.\n", | |
0df6291c | 1529 | (int) (uinfo->spu_userversion >> 16), |
c7e29ff1 | 1530 | (int) (uinfo->spu_userversion & 0xffff), |
0df6291c | 1531 | IPATH_USER_SWMAJOR, |
c7e29ff1 MD |
1532 | IPATH_USER_SWMINOR); |
1533 | goto bail; | |
1534 | } | |
0a5a83cf | 1535 | if (uinfo->spu_subport_cnt > INFINIPATH_MAX_SUBPORT) { |
9929b0fb BS |
1536 | ret = -EINVAL; |
1537 | goto bail; | |
1538 | } | |
1539 | ||
c7e29ff1 MD |
1540 | num_subports = uinfo->spu_subport_cnt; |
1541 | pd->subport_uregbase = vmalloc(PAGE_SIZE * num_subports); | |
9929b0fb BS |
1542 | if (!pd->subport_uregbase) { |
1543 | ret = -ENOMEM; | |
1544 | goto bail; | |
1545 | } | |
1546 | /* Note: pd->port_rcvhdrq_size isn't initialized yet. */ | |
1547 | size = ALIGN(dd->ipath_rcvhdrcnt * dd->ipath_rcvhdrentsize * | |
c7e29ff1 | 1548 | sizeof(u32), PAGE_SIZE) * num_subports; |
9929b0fb BS |
1549 | pd->subport_rcvhdr_base = vmalloc(size); |
1550 | if (!pd->subport_rcvhdr_base) { | |
1551 | ret = -ENOMEM; | |
1552 | goto bail_ureg; | |
1553 | } | |
1554 | ||
1555 | pd->subport_rcvegrbuf = vmalloc(pd->port_rcvegrbuf_chunks * | |
1556 | pd->port_rcvegrbuf_size * | |
c7e29ff1 | 1557 | num_subports); |
9929b0fb BS |
1558 | if (!pd->subport_rcvegrbuf) { |
1559 | ret = -ENOMEM; | |
1560 | goto bail_rhdr; | |
1561 | } | |
1562 | ||
1563 | pd->port_subport_cnt = uinfo->spu_subport_cnt; | |
1564 | pd->port_subport_id = uinfo->spu_subport_id; | |
1565 | pd->active_slaves = 1; | |
947d7617 | 1566 | set_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag); |
c7e29ff1 MD |
1567 | memset(pd->subport_uregbase, 0, PAGE_SIZE * num_subports); |
1568 | memset(pd->subport_rcvhdr_base, 0, size); | |
1569 | memset(pd->subport_rcvegrbuf, 0, pd->port_rcvegrbuf_chunks * | |
1570 | pd->port_rcvegrbuf_size * | |
1571 | num_subports); | |
9929b0fb BS |
1572 | goto bail; |
1573 | ||
1574 | bail_rhdr: | |
1575 | vfree(pd->subport_rcvhdr_base); | |
1576 | bail_ureg: | |
1577 | vfree(pd->subport_uregbase); | |
1578 | pd->subport_uregbase = NULL; | |
1579 | bail: | |
1580 | return ret; | |
1581 | } | |
1582 | ||
7f510b46 | 1583 | static int try_alloc_port(struct ipath_devdata *dd, int port, |
9929b0fb BS |
1584 | struct file *fp, |
1585 | const struct ipath_user_info *uinfo) | |
7f510b46 | 1586 | { |
9929b0fb | 1587 | struct ipath_portdata *pd; |
7f510b46 BS |
1588 | int ret; |
1589 | ||
9929b0fb BS |
1590 | if (!(pd = dd->ipath_pd[port])) { |
1591 | void *ptmp; | |
7f510b46 | 1592 | |
9929b0fb | 1593 | pd = kzalloc(sizeof(struct ipath_portdata), GFP_KERNEL); |
7f510b46 BS |
1594 | |
1595 | /* | |
1596 | * Allocate memory for use in ipath_tid_update() just once | |
1597 | * at open, not per call. Reduces cost of expected send | |
1598 | * setup. | |
1599 | */ | |
1600 | ptmp = kmalloc(dd->ipath_rcvtidcnt * sizeof(u16) + | |
1601 | dd->ipath_rcvtidcnt * sizeof(struct page **), | |
1602 | GFP_KERNEL); | |
9929b0fb | 1603 | if (!pd || !ptmp) { |
7f510b46 BS |
1604 | ipath_dev_err(dd, "Unable to allocate portdata " |
1605 | "memory, failing open\n"); | |
1606 | ret = -ENOMEM; | |
9929b0fb | 1607 | kfree(pd); |
7f510b46 BS |
1608 | kfree(ptmp); |
1609 | goto bail; | |
1610 | } | |
9929b0fb | 1611 | dd->ipath_pd[port] = pd; |
7f510b46 BS |
1612 | dd->ipath_pd[port]->port_port = port; |
1613 | dd->ipath_pd[port]->port_dd = dd; | |
1614 | dd->ipath_pd[port]->port_tid_pg_list = ptmp; | |
1615 | init_waitqueue_head(&dd->ipath_pd[port]->port_wait); | |
1616 | } | |
9929b0fb BS |
1617 | if (!pd->port_cnt) { |
1618 | pd->userversion = uinfo->spu_userversion; | |
1619 | init_user_egr_sizes(pd); | |
1620 | if ((ret = init_subports(dd, pd, uinfo)) != 0) | |
1621 | goto bail; | |
7f510b46 BS |
1622 | ipath_cdbg(PROC, "%s[%u] opened unit:port %u:%u\n", |
1623 | current->comm, current->pid, dd->ipath_unit, | |
1624 | port); | |
9929b0fb BS |
1625 | pd->port_cnt = 1; |
1626 | port_fp(fp) = pd; | |
1627 | pd->port_pid = current->pid; | |
1628 | strncpy(pd->port_comm, current->comm, sizeof(pd->port_comm)); | |
c4b4d16e RC |
1629 | ipath_chg_pioavailkernel(dd, |
1630 | dd->ipath_pbufsport * (pd->port_port - 1), | |
1631 | dd->ipath_pbufsport, 0); | |
7f510b46 BS |
1632 | ipath_stats.sps_ports++; |
1633 | ret = 0; | |
9929b0fb BS |
1634 | } else |
1635 | ret = -EBUSY; | |
7f510b46 BS |
1636 | |
1637 | bail: | |
1638 | return ret; | |
1639 | } | |
1640 | ||
1641 | static inline int usable(struct ipath_devdata *dd) | |
1642 | { | |
1643 | return dd && | |
1644 | (dd->ipath_flags & IPATH_PRESENT) && | |
1645 | dd->ipath_kregbase && | |
1646 | dd->ipath_lid && | |
1647 | !(dd->ipath_flags & (IPATH_LINKDOWN | IPATH_DISABLED | |
1648 | | IPATH_LINKUNK)); | |
1649 | } | |
1650 | ||
9929b0fb BS |
1651 | static int find_free_port(int unit, struct file *fp, |
1652 | const struct ipath_user_info *uinfo) | |
7f510b46 BS |
1653 | { |
1654 | struct ipath_devdata *dd = ipath_lookup(unit); | |
1655 | int ret, i; | |
1656 | ||
1657 | if (!dd) { | |
1658 | ret = -ENODEV; | |
1659 | goto bail; | |
1660 | } | |
1661 | ||
1662 | if (!usable(dd)) { | |
1663 | ret = -ENETDOWN; | |
1664 | goto bail; | |
1665 | } | |
1666 | ||
9929b0fb BS |
1667 | for (i = 1; i < dd->ipath_cfgports; i++) { |
1668 | ret = try_alloc_port(dd, i, fp, uinfo); | |
7f510b46 BS |
1669 | if (ret != -EBUSY) |
1670 | goto bail; | |
1671 | } | |
1672 | ret = -EBUSY; | |
1673 | ||
1674 | bail: | |
1675 | return ret; | |
1676 | } | |
1677 | ||
9929b0fb BS |
1678 | static int find_best_unit(struct file *fp, |
1679 | const struct ipath_user_info *uinfo) | |
7f510b46 BS |
1680 | { |
1681 | int ret = 0, i, prefunit = -1, devmax; | |
1682 | int maxofallports, npresent, nup; | |
1683 | int ndev; | |
1684 | ||
9929b0fb | 1685 | devmax = ipath_count_units(&npresent, &nup, &maxofallports); |
7f510b46 BS |
1686 | |
1687 | /* | |
1688 | * This code is present to allow a knowledgeable person to | |
1689 | * specify the layout of processes to processors before opening | |
1690 | * this driver, and then we'll assign the process to the "closest" | |
525d0ca1 | 1691 | * InfiniPath chip to that processor (we assume reasonable connectivity, |
7f510b46 BS |
1692 | * for now). This code assumes that if affinity has been set |
1693 | * before this point, that at most one cpu is set; for now this | |
1694 | * is reasonable. I check for both cpus_empty() and cpus_full(), | |
1695 | * in case some kernel variant sets none of the bits when no | |
1696 | * affinity is set. 2.6.11 and 12 kernels have all present | |
1697 | * cpus set. Some day we'll have to fix it up further to handle | |
525d0ca1 | 1698 | * a cpu subset. This algorithm fails for two HT chips connected |
7f510b46 BS |
1699 | * in tunnel fashion. Eventually this needs real topology |
1700 | * information. There may be some issues with dual core numbering | |
1701 | * as well. This needs more work prior to release. | |
1702 | */ | |
1703 | if (!cpus_empty(current->cpus_allowed) && | |
1704 | !cpus_full(current->cpus_allowed)) { | |
f0810daf | 1705 | int ncpus = num_online_cpus(), curcpu = -1, nset = 0; |
7f510b46 BS |
1706 | for (i = 0; i < ncpus; i++) |
1707 | if (cpu_isset(i, current->cpus_allowed)) { | |
1708 | ipath_cdbg(PROC, "%s[%u] affinity set for " | |
f0810daf BS |
1709 | "cpu %d/%d\n", current->comm, |
1710 | current->pid, i, ncpus); | |
7f510b46 | 1711 | curcpu = i; |
f0810daf | 1712 | nset++; |
7f510b46 | 1713 | } |
f0810daf | 1714 | if (curcpu != -1 && nset != ncpus) { |
7f510b46 BS |
1715 | if (npresent) { |
1716 | prefunit = curcpu / (ncpus / npresent); | |
c7e29ff1 | 1717 | ipath_cdbg(PROC,"%s[%u] %d chips, %d cpus, " |
7f510b46 BS |
1718 | "%d cpus/chip, select unit %d\n", |
1719 | current->comm, current->pid, | |
1720 | npresent, ncpus, ncpus / npresent, | |
1721 | prefunit); | |
1722 | } | |
1723 | } | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * user ports start at 1, kernel port is 0 | |
1728 | * For now, we do round-robin access across all chips | |
1729 | */ | |
1730 | ||
1731 | if (prefunit != -1) | |
1732 | devmax = prefunit + 1; | |
7f510b46 BS |
1733 | recheck: |
1734 | for (i = 1; i < maxofallports; i++) { | |
1735 | for (ndev = prefunit != -1 ? prefunit : 0; ndev < devmax; | |
1736 | ndev++) { | |
1737 | struct ipath_devdata *dd = ipath_lookup(ndev); | |
1738 | ||
1739 | if (!usable(dd)) | |
1740 | continue; /* can't use this unit */ | |
1741 | if (i >= dd->ipath_cfgports) | |
1742 | /* | |
1743 | * Maxed out on users of this unit. Try | |
1744 | * next. | |
1745 | */ | |
1746 | continue; | |
9929b0fb | 1747 | ret = try_alloc_port(dd, i, fp, uinfo); |
7f510b46 BS |
1748 | if (!ret) |
1749 | goto done; | |
1750 | } | |
1751 | } | |
1752 | ||
1753 | if (npresent) { | |
1754 | if (nup == 0) { | |
1755 | ret = -ENETDOWN; | |
1756 | ipath_dbg("No ports available (none initialized " | |
1757 | "and ready)\n"); | |
1758 | } else { | |
1759 | if (prefunit > 0) { | |
1760 | /* if started above 0, retry from 0 */ | |
1761 | ipath_cdbg(PROC, | |
1762 | "%s[%u] no ports on prefunit " | |
1763 | "%d, clear and re-check\n", | |
1764 | current->comm, current->pid, | |
1765 | prefunit); | |
1766 | devmax = ipath_count_units(NULL, NULL, | |
1767 | NULL); | |
1768 | prefunit = -1; | |
1769 | goto recheck; | |
1770 | } | |
1771 | ret = -EBUSY; | |
1772 | ipath_dbg("No ports available\n"); | |
1773 | } | |
1774 | } else { | |
1775 | ret = -ENXIO; | |
1776 | ipath_dbg("No boards found\n"); | |
1777 | } | |
1778 | ||
1779 | done: | |
1780 | return ret; | |
1781 | } | |
1782 | ||
9929b0fb BS |
1783 | static int find_shared_port(struct file *fp, |
1784 | const struct ipath_user_info *uinfo) | |
1785 | { | |
1786 | int devmax, ndev, i; | |
1787 | int ret = 0; | |
1788 | ||
1789 | devmax = ipath_count_units(NULL, NULL, NULL); | |
1790 | ||
1791 | for (ndev = 0; ndev < devmax; ndev++) { | |
1792 | struct ipath_devdata *dd = ipath_lookup(ndev); | |
1793 | ||
5d1ce03d | 1794 | if (!usable(dd)) |
9929b0fb BS |
1795 | continue; |
1796 | for (i = 1; i < dd->ipath_cfgports; i++) { | |
1797 | struct ipath_portdata *pd = dd->ipath_pd[i]; | |
1798 | ||
1799 | /* Skip ports which are not yet open */ | |
1800 | if (!pd || !pd->port_cnt) | |
1801 | continue; | |
1802 | /* Skip port if it doesn't match the requested one */ | |
1803 | if (pd->port_subport_id != uinfo->spu_subport_id) | |
1804 | continue; | |
1805 | /* Verify the sharing process matches the master */ | |
1806 | if (pd->port_subport_cnt != uinfo->spu_subport_cnt || | |
1807 | pd->userversion != uinfo->spu_userversion || | |
1808 | pd->port_cnt >= pd->port_subport_cnt) { | |
1809 | ret = -EINVAL; | |
1810 | goto done; | |
1811 | } | |
1812 | port_fp(fp) = pd; | |
1813 | subport_fp(fp) = pd->port_cnt++; | |
755807a2 | 1814 | pd->port_subpid[subport_fp(fp)] = current->pid; |
9929b0fb BS |
1815 | tidcursor_fp(fp) = 0; |
1816 | pd->active_slaves |= 1 << subport_fp(fp); | |
1817 | ipath_cdbg(PROC, | |
1818 | "%s[%u] %u sharing %s[%u] unit:port %u:%u\n", | |
1819 | current->comm, current->pid, | |
1820 | subport_fp(fp), | |
1821 | pd->port_comm, pd->port_pid, | |
1822 | dd->ipath_unit, pd->port_port); | |
1823 | ret = 1; | |
1824 | goto done; | |
1825 | } | |
1826 | } | |
1827 | ||
1828 | done: | |
1829 | return ret; | |
1830 | } | |
1831 | ||
7f510b46 BS |
1832 | static int ipath_open(struct inode *in, struct file *fp) |
1833 | { | |
c97d27d8 | 1834 | /* The real work is performed later in ipath_assign_port() */ |
9929b0fb BS |
1835 | fp->private_data = kzalloc(sizeof(struct ipath_filedata), GFP_KERNEL); |
1836 | return fp->private_data ? 0 : -ENOMEM; | |
1837 | } | |
1838 | ||
c97d27d8 BS |
1839 | /* Get port early, so can set affinity prior to memory allocation */ |
1840 | static int ipath_assign_port(struct file *fp, | |
9929b0fb BS |
1841 | const struct ipath_user_info *uinfo) |
1842 | { | |
1843 | int ret; | |
9929b0fb | 1844 | int i_minor; |
0df6291c | 1845 | unsigned swmajor, swminor; |
9929b0fb BS |
1846 | |
1847 | /* Check to be sure we haven't already initialized this file */ | |
1848 | if (port_fp(fp)) { | |
1849 | ret = -EINVAL; | |
1850 | goto done; | |
1851 | } | |
1852 | ||
1853 | /* for now, if major version is different, bail */ | |
0df6291c MD |
1854 | swmajor = uinfo->spu_userversion >> 16; |
1855 | if (swmajor != IPATH_USER_SWMAJOR) { | |
9929b0fb BS |
1856 | ipath_dbg("User major version %d not same as driver " |
1857 | "major %d\n", uinfo->spu_userversion >> 16, | |
1858 | IPATH_USER_SWMAJOR); | |
1859 | ret = -ENODEV; | |
1860 | goto done; | |
1861 | } | |
1862 | ||
1863 | swminor = uinfo->spu_userversion & 0xffff; | |
1864 | if (swminor != IPATH_USER_SWMINOR) | |
1865 | ipath_dbg("User minor version %d not same as driver " | |
1866 | "minor %d\n", swminor, IPATH_USER_SWMINOR); | |
7f510b46 BS |
1867 | |
1868 | mutex_lock(&ipath_mutex); | |
1869 | ||
0df6291c MD |
1870 | if (ipath_compatible_subports(swmajor, swminor) && |
1871 | uinfo->spu_subport_cnt && | |
9929b0fb BS |
1872 | (ret = find_shared_port(fp, uinfo))) { |
1873 | mutex_unlock(&ipath_mutex); | |
1874 | if (ret > 0) | |
1875 | ret = 0; | |
1876 | goto done; | |
1877 | } | |
1878 | ||
1cfd6e64 | 1879 | i_minor = iminor(fp->f_path.dentry->d_inode) - IPATH_USER_MINOR_BASE; |
7f510b46 | 1880 | ipath_cdbg(VERBOSE, "open on dev %lx (minor %d)\n", |
1cfd6e64 | 1881 | (long)fp->f_path.dentry->d_inode->i_rdev, i_minor); |
7f510b46 | 1882 | |
9929b0fb BS |
1883 | if (i_minor) |
1884 | ret = find_free_port(i_minor - 1, fp, uinfo); | |
7f510b46 | 1885 | else |
9929b0fb | 1886 | ret = find_best_unit(fp, uinfo); |
7f510b46 BS |
1887 | |
1888 | mutex_unlock(&ipath_mutex); | |
9929b0fb | 1889 | |
c97d27d8 BS |
1890 | done: |
1891 | return ret; | |
1892 | } | |
1893 | ||
1894 | ||
1895 | static int ipath_do_user_init(struct file *fp, | |
1896 | const struct ipath_user_info *uinfo) | |
1897 | { | |
1898 | int ret; | |
947d7617 | 1899 | struct ipath_portdata *pd = port_fp(fp); |
c97d27d8 BS |
1900 | struct ipath_devdata *dd; |
1901 | u32 head32; | |
9929b0fb | 1902 | |
947d7617 RC |
1903 | /* Subports don't need to initialize anything since master did it. */ |
1904 | if (subport_fp(fp)) { | |
1905 | ret = wait_event_interruptible(pd->port_wait, | |
1906 | !test_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag)); | |
1907 | goto done; | |
1908 | } | |
1909 | ||
9929b0fb BS |
1910 | dd = pd->port_dd; |
1911 | ||
1912 | if (uinfo->spu_rcvhdrsize) { | |
1913 | ret = ipath_setrcvhdrsize(dd, uinfo->spu_rcvhdrsize); | |
1914 | if (ret) | |
1915 | goto done; | |
1916 | } | |
1917 | ||
1918 | /* for now we do nothing with rcvhdrcnt: uinfo->spu_rcvhdrcnt */ | |
1919 | ||
1920 | /* for right now, kernel piobufs are at end, so port 1 is at 0 */ | |
1921 | pd->port_piobufs = dd->ipath_piobufbase + | |
1922 | dd->ipath_pbufsport * (pd->port_port - 1) * dd->ipath_palign; | |
1923 | ipath_cdbg(VERBOSE, "Set base of piobufs for port %u to 0x%x\n", | |
1924 | pd->port_port, pd->port_piobufs); | |
1925 | ||
1926 | /* | |
1927 | * Now allocate the rcvhdr Q and eager TIDs; skip the TID | |
1928 | * array for time being. If pd->port_port > chip-supported, | |
1929 | * we need to do extra stuff here to handle by handling overflow | |
1930 | * through port 0, someday | |
1931 | */ | |
1932 | ret = ipath_create_rcvhdrq(dd, pd); | |
1933 | if (!ret) | |
1934 | ret = ipath_create_user_egr(pd); | |
1935 | if (ret) | |
1936 | goto done; | |
1937 | ||
1938 | /* | |
1939 | * set the eager head register for this port to the current values | |
1940 | * of the tail pointers, since we don't know if they were | |
1941 | * updated on last use of the port. | |
1942 | */ | |
1943 | head32 = ipath_read_ureg32(dd, ur_rcvegrindextail, pd->port_port); | |
1944 | ipath_write_ureg(dd, ur_rcvegrindexhead, head32, pd->port_port); | |
755807a2 | 1945 | pd->port_lastrcvhdrqtail = -1; |
9929b0fb BS |
1946 | ipath_cdbg(VERBOSE, "Wrote port%d egrhead %x from tail regs\n", |
1947 | pd->port_port, head32); | |
1948 | pd->port_tidcursor = 0; /* start at beginning after open */ | |
70c51da2 AJ |
1949 | |
1950 | /* initialize poll variables... */ | |
1951 | pd->port_urgent = 0; | |
1952 | pd->port_urgent_poll = 0; | |
1953 | pd->port_hdrqfull_poll = pd->port_hdrqfull; | |
1954 | ||
9929b0fb | 1955 | /* |
9355fb6a RC |
1956 | * Now enable the port for receive. |
1957 | * For chips that are set to DMA the tail register to memory | |
1958 | * when they change (and when the update bit transitions from | |
1959 | * 0 to 1. So for those chips, we turn it off and then back on. | |
1960 | * This will (very briefly) affect any other open ports, but the | |
1961 | * duration is very short, and therefore isn't an issue. We | |
1962 | * explictly set the in-memory tail copy to 0 beforehand, so we | |
1963 | * don't have to wait to be sure the DMA update has happened | |
1964 | * (chip resets head/tail to 0 on transition to enable). | |
9929b0fb | 1965 | */ |
d8274869 | 1966 | set_bit(dd->ipath_r_portenable_shift + pd->port_port, |
9929b0fb | 1967 | &dd->ipath_rcvctrl); |
9355fb6a RC |
1968 | if (!(dd->ipath_flags & IPATH_NODMA_RTAIL)) { |
1969 | if (pd->port_rcvhdrtail_kvaddr) | |
1970 | ipath_clear_rcvhdrtail(pd); | |
1971 | ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, | |
d8274869 DO |
1972 | dd->ipath_rcvctrl & |
1973 | ~(1ULL << dd->ipath_r_tailupd_shift)); | |
9355fb6a | 1974 | } |
9929b0fb BS |
1975 | ipath_write_kreg(dd, dd->ipath_kregs->kr_rcvctrl, |
1976 | dd->ipath_rcvctrl); | |
947d7617 RC |
1977 | /* Notify any waiting slaves */ |
1978 | if (pd->port_subport_cnt) { | |
1979 | clear_bit(IPATH_PORT_MASTER_UNINIT, &pd->port_flag); | |
1980 | wake_up(&pd->port_wait); | |
1981 | } | |
9929b0fb | 1982 | done: |
7f510b46 BS |
1983 | return ret; |
1984 | } | |
1985 | ||
1986 | /** | |
1987 | * unlock_exptid - unlock any expected TID entries port still had in use | |
1988 | * @pd: port | |
1989 | * | |
1990 | * We don't actually update the chip here, because we do a bulk update | |
1991 | * below, using ipath_f_clear_tids. | |
1992 | */ | |
1993 | static void unlock_expected_tids(struct ipath_portdata *pd) | |
1994 | { | |
1995 | struct ipath_devdata *dd = pd->port_dd; | |
1996 | int port_tidbase = pd->port_port * dd->ipath_rcvtidcnt; | |
1997 | int i, cnt = 0, maxtid = port_tidbase + dd->ipath_rcvtidcnt; | |
1998 | ||
1999 | ipath_cdbg(VERBOSE, "Port %u unlocking any locked expTID pages\n", | |
2000 | pd->port_port); | |
2001 | for (i = port_tidbase; i < maxtid; i++) { | |
9355fb6a RC |
2002 | struct page *ps = dd->ipath_pageshadow[i]; |
2003 | ||
2004 | if (!ps) | |
7f510b46 BS |
2005 | continue; |
2006 | ||
9355fb6a | 2007 | dd->ipath_pageshadow[i] = NULL; |
1fd3b40f BS |
2008 | pci_unmap_page(dd->pcidev, dd->ipath_physshadow[i], |
2009 | PAGE_SIZE, PCI_DMA_FROMDEVICE); | |
9355fb6a | 2010 | ipath_release_user_pages_on_close(&ps, 1); |
7f510b46 BS |
2011 | cnt++; |
2012 | ipath_stats.sps_pageunlocks++; | |
2013 | } | |
2014 | if (cnt) | |
2015 | ipath_cdbg(VERBOSE, "Port %u locked %u expTID entries\n", | |
2016 | pd->port_port, cnt); | |
2017 | ||
2018 | if (ipath_stats.sps_pagelocks || ipath_stats.sps_pageunlocks) | |
2019 | ipath_cdbg(VERBOSE, "%llu pages locked, %llu unlocked\n", | |
2020 | (unsigned long long) ipath_stats.sps_pagelocks, | |
2021 | (unsigned long long) | |
2022 | ipath_stats.sps_pageunlocks); | |
2023 | } | |
2024 | ||
2025 | static int ipath_close(struct inode *in, struct file *fp) | |
2026 | { | |
2027 | int ret = 0; | |
9929b0fb | 2028 | struct ipath_filedata *fd; |
7f510b46 BS |
2029 | struct ipath_portdata *pd; |
2030 | struct ipath_devdata *dd; | |
2031 | unsigned port; | |
2032 | ||
2033 | ipath_cdbg(VERBOSE, "close on dev %lx, private data %p\n", | |
2034 | (long)in->i_rdev, fp->private_data); | |
2035 | ||
2036 | mutex_lock(&ipath_mutex); | |
2037 | ||
9929b0fb | 2038 | fd = (struct ipath_filedata *) fp->private_data; |
7f510b46 | 2039 | fp->private_data = NULL; |
9929b0fb BS |
2040 | pd = fd->pd; |
2041 | if (!pd) { | |
2042 | mutex_unlock(&ipath_mutex); | |
2043 | goto bail; | |
2044 | } | |
2045 | if (--pd->port_cnt) { | |
2046 | /* | |
2047 | * XXX If the master closes the port before the slave(s), | |
2048 | * revoke the mmap for the eager receive queue so | |
2049 | * the slave(s) don't wait for receive data forever. | |
2050 | */ | |
2051 | pd->active_slaves &= ~(1 << fd->subport); | |
755807a2 | 2052 | pd->port_subpid[fd->subport] = 0; |
9929b0fb BS |
2053 | mutex_unlock(&ipath_mutex); |
2054 | goto bail; | |
2055 | } | |
2056 | port = pd->port_port; | |
7f510b46 BS |
2057 | dd = pd->port_dd; |
2058 | ||
2059 | if (pd->port_hdrqfull) { | |
2060 | ipath_cdbg(PROC, "%s[%u] had %u rcvhdrqfull errors " | |
2061 | "during run\n", pd->port_comm, pd->port_pid, | |
2062 | pd->port_hdrqfull); | |
2063 | pd->port_hdrqfull = 0; | |
2064 | } | |
2065 | ||
2066 | if (pd->port_rcvwait_to || pd->port_piowait_to | |
2067 | || pd->port_rcvnowait || pd->port_pionowait) { | |
2068 | ipath_cdbg(VERBOSE, "port%u, %u rcv, %u pio wait timeo; " | |
2069 | "%u rcv %u, pio already\n", | |
2070 | pd->port_port, pd->port_rcvwait_to, | |
2071 | pd->port_piowait_to, pd->port_rcvnowait, | |
2072 | pd->port_pionowait); | |
2073 | pd->port_rcvwait_to = pd->port_piowait_to = | |
2074 | pd->port_rcvnowait = pd->port_pionowait = 0; | |
2075 | } | |
2076 | if (pd->port_flag) { | |
2077 | ipath_dbg("port %u port_flag still set to 0x%lx\n", | |
2078 | pd->port_port, pd->port_flag); | |
2079 | pd->port_flag = 0; | |
2080 | } | |
2081 | ||
2082 | if (dd->ipath_kregbase) { | |
35783ec0 | 2083 | int i; |
70c51da2 | 2084 | /* atomically clear receive enable port and intr avail. */ |
d8274869 | 2085 | clear_bit(dd->ipath_r_portenable_shift + port, |
35783ec0 | 2086 | &dd->ipath_rcvctrl); |
d8274869 | 2087 | clear_bit(pd->port_port + dd->ipath_r_intravail_shift, |
70c51da2 | 2088 | &dd->ipath_rcvctrl); |
35783ec0 BS |
2089 | ipath_write_kreg( dd, dd->ipath_kregs->kr_rcvctrl, |
2090 | dd->ipath_rcvctrl); | |
2091 | /* and read back from chip to be sure that nothing | |
2092 | * else is in flight when we do the rest */ | |
2093 | (void)ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch); | |
7f510b46 BS |
2094 | |
2095 | /* clean up the pkeys for this port user */ | |
2096 | ipath_clean_part_key(pd, dd); | |
35783ec0 BS |
2097 | /* |
2098 | * be paranoid, and never write 0's to these, just use an | |
2099 | * unused part of the port 0 tail page. Of course, | |
2100 | * rcvhdraddr points to a large chunk of memory, so this | |
2101 | * could still trash things, but at least it won't trash | |
2102 | * page 0, and by disabling the port, it should stop "soon", | |
2103 | * even if a packet or two is in already in flight after we | |
2104 | * disabled the port. | |
2105 | */ | |
2106 | ipath_write_kreg_port(dd, | |
2107 | dd->ipath_kregs->kr_rcvhdrtailaddr, port, | |
2108 | dd->ipath_dummy_hdrq_phys); | |
2109 | ipath_write_kreg_port(dd, dd->ipath_kregs->kr_rcvhdraddr, | |
2110 | pd->port_port, dd->ipath_dummy_hdrq_phys); | |
2111 | ||
2112 | i = dd->ipath_pbufsport * (port - 1); | |
2113 | ipath_disarm_piobufs(dd, i, dd->ipath_pbufsport); | |
c4b4d16e | 2114 | ipath_chg_pioavailkernel(dd, i, dd->ipath_pbufsport, 1); |
35783ec0 | 2115 | |
1fd3b40f BS |
2116 | dd->ipath_f_clear_tids(dd, pd->port_port); |
2117 | ||
35783ec0 BS |
2118 | if (dd->ipath_pageshadow) |
2119 | unlock_expected_tids(pd); | |
2120 | ipath_stats.sps_ports--; | |
2121 | ipath_cdbg(PROC, "%s[%u] closed port %u:%u\n", | |
2122 | pd->port_comm, pd->port_pid, | |
2123 | dd->ipath_unit, port); | |
7f510b46 BS |
2124 | } |
2125 | ||
7f510b46 | 2126 | pd->port_pid = 0; |
f37bda92 | 2127 | dd->ipath_pd[pd->port_port] = NULL; /* before releasing mutex */ |
7f510b46 | 2128 | mutex_unlock(&ipath_mutex); |
f37bda92 | 2129 | ipath_free_pddata(dd, pd); /* after releasing the mutex */ |
7f510b46 | 2130 | |
9929b0fb BS |
2131 | bail: |
2132 | kfree(fd); | |
7f510b46 BS |
2133 | return ret; |
2134 | } | |
2135 | ||
9929b0fb | 2136 | static int ipath_port_info(struct ipath_portdata *pd, u16 subport, |
7f510b46 BS |
2137 | struct ipath_port_info __user *uinfo) |
2138 | { | |
2139 | struct ipath_port_info info; | |
2140 | int nup; | |
2141 | int ret; | |
9929b0fb | 2142 | size_t sz; |
7f510b46 BS |
2143 | |
2144 | (void) ipath_count_units(NULL, &nup, NULL); | |
2145 | info.num_active = nup; | |
2146 | info.unit = pd->port_dd->ipath_unit; | |
2147 | info.port = pd->port_port; | |
9929b0fb BS |
2148 | info.subport = subport; |
2149 | /* Don't return new fields if old library opened the port. */ | |
0df6291c MD |
2150 | if (ipath_supports_subports(pd->userversion >> 16, |
2151 | pd->userversion & 0xffff)) { | |
9929b0fb BS |
2152 | /* Number of user ports available for this device. */ |
2153 | info.num_ports = pd->port_dd->ipath_cfgports - 1; | |
2154 | info.num_subports = pd->port_subport_cnt; | |
2155 | sz = sizeof(info); | |
2156 | } else | |
2157 | sz = sizeof(info) - 2 * sizeof(u16); | |
7f510b46 | 2158 | |
9929b0fb | 2159 | if (copy_to_user(uinfo, &info, sz)) { |
7f510b46 BS |
2160 | ret = -EFAULT; |
2161 | goto bail; | |
2162 | } | |
2163 | ret = 0; | |
2164 | ||
2165 | bail: | |
2166 | return ret; | |
2167 | } | |
2168 | ||
9929b0fb BS |
2169 | static int ipath_get_slave_info(struct ipath_portdata *pd, |
2170 | void __user *slave_mask_addr) | |
2171 | { | |
2172 | int ret = 0; | |
2173 | ||
2174 | if (copy_to_user(slave_mask_addr, &pd->active_slaves, sizeof(u32))) | |
2175 | ret = -EFAULT; | |
2176 | return ret; | |
2177 | } | |
2178 | ||
7f510b46 BS |
2179 | static ssize_t ipath_write(struct file *fp, const char __user *data, |
2180 | size_t count, loff_t *off) | |
2181 | { | |
2182 | const struct ipath_cmd __user *ucmd; | |
2183 | struct ipath_portdata *pd; | |
2184 | const void __user *src; | |
2185 | size_t consumed, copy; | |
2186 | struct ipath_cmd cmd; | |
2187 | ssize_t ret = 0; | |
2188 | void *dest; | |
2189 | ||
2190 | if (count < sizeof(cmd.type)) { | |
2191 | ret = -EINVAL; | |
2192 | goto bail; | |
2193 | } | |
2194 | ||
2195 | ucmd = (const struct ipath_cmd __user *) data; | |
2196 | ||
2197 | if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) { | |
2198 | ret = -EFAULT; | |
2199 | goto bail; | |
2200 | } | |
2201 | ||
2202 | consumed = sizeof(cmd.type); | |
2203 | ||
2204 | switch (cmd.type) { | |
c97d27d8 BS |
2205 | case IPATH_CMD_ASSIGN_PORT: |
2206 | case __IPATH_CMD_USER_INIT: | |
7f510b46 BS |
2207 | case IPATH_CMD_USER_INIT: |
2208 | copy = sizeof(cmd.cmd.user_info); | |
2209 | dest = &cmd.cmd.user_info; | |
2210 | src = &ucmd->cmd.user_info; | |
2211 | break; | |
2212 | case IPATH_CMD_RECV_CTRL: | |
2213 | copy = sizeof(cmd.cmd.recv_ctrl); | |
2214 | dest = &cmd.cmd.recv_ctrl; | |
2215 | src = &ucmd->cmd.recv_ctrl; | |
2216 | break; | |
2217 | case IPATH_CMD_PORT_INFO: | |
2218 | copy = sizeof(cmd.cmd.port_info); | |
2219 | dest = &cmd.cmd.port_info; | |
2220 | src = &ucmd->cmd.port_info; | |
2221 | break; | |
2222 | case IPATH_CMD_TID_UPDATE: | |
2223 | case IPATH_CMD_TID_FREE: | |
2224 | copy = sizeof(cmd.cmd.tid_info); | |
2225 | dest = &cmd.cmd.tid_info; | |
2226 | src = &ucmd->cmd.tid_info; | |
2227 | break; | |
2228 | case IPATH_CMD_SET_PART_KEY: | |
2229 | copy = sizeof(cmd.cmd.part_key); | |
2230 | dest = &cmd.cmd.part_key; | |
2231 | src = &ucmd->cmd.part_key; | |
2232 | break; | |
c7e29ff1 | 2233 | case __IPATH_CMD_SLAVE_INFO: |
9929b0fb BS |
2234 | copy = sizeof(cmd.cmd.slave_mask_addr); |
2235 | dest = &cmd.cmd.slave_mask_addr; | |
2236 | src = &ucmd->cmd.slave_mask_addr; | |
2237 | break; | |
569b87b4 AJ |
2238 | case IPATH_CMD_PIOAVAILUPD: // force an update of PIOAvail reg |
2239 | copy = 0; | |
2240 | src = NULL; | |
2241 | dest = NULL; | |
2242 | break; | |
f2d04231 RW |
2243 | case IPATH_CMD_POLL_TYPE: |
2244 | copy = sizeof(cmd.cmd.poll_type); | |
2245 | dest = &cmd.cmd.poll_type; | |
2246 | src = &ucmd->cmd.poll_type; | |
2247 | break; | |
6ac50727 DO |
2248 | case IPATH_CMD_ARMLAUNCH_CTRL: |
2249 | copy = sizeof(cmd.cmd.armlaunch_ctrl); | |
2250 | dest = &cmd.cmd.armlaunch_ctrl; | |
2251 | src = &ucmd->cmd.armlaunch_ctrl; | |
2252 | break; | |
7f510b46 BS |
2253 | default: |
2254 | ret = -EINVAL; | |
2255 | goto bail; | |
2256 | } | |
2257 | ||
569b87b4 AJ |
2258 | if (copy) { |
2259 | if ((count - consumed) < copy) { | |
2260 | ret = -EINVAL; | |
2261 | goto bail; | |
2262 | } | |
7f510b46 | 2263 | |
569b87b4 AJ |
2264 | if (copy_from_user(dest, src, copy)) { |
2265 | ret = -EFAULT; | |
2266 | goto bail; | |
2267 | } | |
2268 | ||
2269 | consumed += copy; | |
7f510b46 BS |
2270 | } |
2271 | ||
7f510b46 | 2272 | pd = port_fp(fp); |
c97d27d8 BS |
2273 | if (!pd && cmd.type != __IPATH_CMD_USER_INIT && |
2274 | cmd.type != IPATH_CMD_ASSIGN_PORT) { | |
9929b0fb BS |
2275 | ret = -EINVAL; |
2276 | goto bail; | |
2277 | } | |
7f510b46 BS |
2278 | |
2279 | switch (cmd.type) { | |
c97d27d8 BS |
2280 | case IPATH_CMD_ASSIGN_PORT: |
2281 | ret = ipath_assign_port(fp, &cmd.cmd.user_info); | |
2282 | if (ret) | |
2283 | goto bail; | |
2284 | break; | |
2285 | case __IPATH_CMD_USER_INIT: | |
2286 | /* backwards compatibility, get port first */ | |
2287 | ret = ipath_assign_port(fp, &cmd.cmd.user_info); | |
2288 | if (ret) | |
2289 | goto bail; | |
2290 | /* and fall through to current version. */ | |
7f510b46 | 2291 | case IPATH_CMD_USER_INIT: |
9929b0fb BS |
2292 | ret = ipath_do_user_init(fp, &cmd.cmd.user_info); |
2293 | if (ret) | |
7f510b46 BS |
2294 | goto bail; |
2295 | ret = ipath_get_base_info( | |
9929b0fb | 2296 | fp, (void __user *) (unsigned long) |
7f510b46 BS |
2297 | cmd.cmd.user_info.spu_base_info, |
2298 | cmd.cmd.user_info.spu_base_info_size); | |
2299 | break; | |
2300 | case IPATH_CMD_RECV_CTRL: | |
9929b0fb | 2301 | ret = ipath_manage_rcvq(pd, subport_fp(fp), cmd.cmd.recv_ctrl); |
7f510b46 BS |
2302 | break; |
2303 | case IPATH_CMD_PORT_INFO: | |
9929b0fb | 2304 | ret = ipath_port_info(pd, subport_fp(fp), |
7f510b46 BS |
2305 | (struct ipath_port_info __user *) |
2306 | (unsigned long) cmd.cmd.port_info); | |
2307 | break; | |
2308 | case IPATH_CMD_TID_UPDATE: | |
9929b0fb | 2309 | ret = ipath_tid_update(pd, fp, &cmd.cmd.tid_info); |
7f510b46 BS |
2310 | break; |
2311 | case IPATH_CMD_TID_FREE: | |
9929b0fb | 2312 | ret = ipath_tid_free(pd, subport_fp(fp), &cmd.cmd.tid_info); |
7f510b46 BS |
2313 | break; |
2314 | case IPATH_CMD_SET_PART_KEY: | |
2315 | ret = ipath_set_part_key(pd, cmd.cmd.part_key); | |
2316 | break; | |
c7e29ff1 | 2317 | case __IPATH_CMD_SLAVE_INFO: |
9929b0fb BS |
2318 | ret = ipath_get_slave_info(pd, |
2319 | (void __user *) (unsigned long) | |
2320 | cmd.cmd.slave_mask_addr); | |
2321 | break; | |
569b87b4 | 2322 | case IPATH_CMD_PIOAVAILUPD: |
c4b4d16e | 2323 | ipath_force_pio_avail_update(pd->port_dd); |
569b87b4 | 2324 | break; |
f2d04231 RW |
2325 | case IPATH_CMD_POLL_TYPE: |
2326 | pd->poll_type = cmd.cmd.poll_type; | |
2327 | break; | |
6ac50727 DO |
2328 | case IPATH_CMD_ARMLAUNCH_CTRL: |
2329 | if (cmd.cmd.armlaunch_ctrl) | |
2330 | ipath_enable_armlaunch(pd->port_dd); | |
2331 | else | |
2332 | ipath_disable_armlaunch(pd->port_dd); | |
2333 | break; | |
7f510b46 BS |
2334 | } |
2335 | ||
2336 | if (ret >= 0) | |
2337 | ret = consumed; | |
2338 | ||
2339 | bail: | |
2340 | return ret; | |
2341 | } | |
2342 | ||
2343 | static struct class *ipath_class; | |
2344 | ||
2b8693c0 | 2345 | static int init_cdev(int minor, char *name, const struct file_operations *fops, |
7f510b46 BS |
2346 | struct cdev **cdevp, struct class_device **class_devp) |
2347 | { | |
2348 | const dev_t dev = MKDEV(IPATH_MAJOR, minor); | |
2349 | struct cdev *cdev = NULL; | |
2350 | struct class_device *class_dev = NULL; | |
2351 | int ret; | |
2352 | ||
2353 | cdev = cdev_alloc(); | |
2354 | if (!cdev) { | |
2355 | printk(KERN_ERR IPATH_DRV_NAME | |
2356 | ": Could not allocate cdev for minor %d, %s\n", | |
2357 | minor, name); | |
2358 | ret = -ENOMEM; | |
2359 | goto done; | |
2360 | } | |
2361 | ||
2362 | cdev->owner = THIS_MODULE; | |
2363 | cdev->ops = fops; | |
2364 | kobject_set_name(&cdev->kobj, name); | |
2365 | ||
2366 | ret = cdev_add(cdev, dev, 1); | |
2367 | if (ret < 0) { | |
2368 | printk(KERN_ERR IPATH_DRV_NAME | |
2369 | ": Could not add cdev for minor %d, %s (err %d)\n", | |
2370 | minor, name, -ret); | |
2371 | goto err_cdev; | |
2372 | } | |
2373 | ||
2374 | class_dev = class_device_create(ipath_class, NULL, dev, NULL, name); | |
2375 | ||
2376 | if (IS_ERR(class_dev)) { | |
2377 | ret = PTR_ERR(class_dev); | |
2378 | printk(KERN_ERR IPATH_DRV_NAME ": Could not create " | |
2379 | "class_dev for minor %d, %s (err %d)\n", | |
2380 | minor, name, -ret); | |
2381 | goto err_cdev; | |
2382 | } | |
2383 | ||
2384 | goto done; | |
2385 | ||
2386 | err_cdev: | |
2387 | cdev_del(cdev); | |
2388 | cdev = NULL; | |
2389 | ||
2390 | done: | |
2391 | if (ret >= 0) { | |
2392 | *cdevp = cdev; | |
2393 | *class_devp = class_dev; | |
2394 | } else { | |
2395 | *cdevp = NULL; | |
2396 | *class_devp = NULL; | |
2397 | } | |
2398 | ||
2399 | return ret; | |
2400 | } | |
2401 | ||
2b8693c0 | 2402 | int ipath_cdev_init(int minor, char *name, const struct file_operations *fops, |
7f510b46 BS |
2403 | struct cdev **cdevp, struct class_device **class_devp) |
2404 | { | |
2405 | return init_cdev(minor, name, fops, cdevp, class_devp); | |
2406 | } | |
2407 | ||
2408 | static void cleanup_cdev(struct cdev **cdevp, | |
2409 | struct class_device **class_devp) | |
2410 | { | |
2411 | struct class_device *class_dev = *class_devp; | |
2412 | ||
2413 | if (class_dev) { | |
2414 | class_device_unregister(class_dev); | |
2415 | *class_devp = NULL; | |
2416 | } | |
2417 | ||
2418 | if (*cdevp) { | |
2419 | cdev_del(*cdevp); | |
2420 | *cdevp = NULL; | |
2421 | } | |
2422 | } | |
2423 | ||
2424 | void ipath_cdev_cleanup(struct cdev **cdevp, | |
2425 | struct class_device **class_devp) | |
2426 | { | |
2427 | cleanup_cdev(cdevp, class_devp); | |
2428 | } | |
2429 | ||
2430 | static struct cdev *wildcard_cdev; | |
2431 | static struct class_device *wildcard_class_dev; | |
2432 | ||
2433 | static const dev_t dev = MKDEV(IPATH_MAJOR, 0); | |
2434 | ||
2435 | static int user_init(void) | |
2436 | { | |
2437 | int ret; | |
2438 | ||
2439 | ret = register_chrdev_region(dev, IPATH_NMINORS, IPATH_DRV_NAME); | |
2440 | if (ret < 0) { | |
2441 | printk(KERN_ERR IPATH_DRV_NAME ": Could not register " | |
2442 | "chrdev region (err %d)\n", -ret); | |
2443 | goto done; | |
2444 | } | |
2445 | ||
2446 | ipath_class = class_create(THIS_MODULE, IPATH_DRV_NAME); | |
2447 | ||
2448 | if (IS_ERR(ipath_class)) { | |
2449 | ret = PTR_ERR(ipath_class); | |
2450 | printk(KERN_ERR IPATH_DRV_NAME ": Could not create " | |
2451 | "device class (err %d)\n", -ret); | |
2452 | goto bail; | |
2453 | } | |
2454 | ||
2455 | goto done; | |
2456 | bail: | |
2457 | unregister_chrdev_region(dev, IPATH_NMINORS); | |
2458 | done: | |
2459 | return ret; | |
2460 | } | |
2461 | ||
2462 | static void user_cleanup(void) | |
2463 | { | |
2464 | if (ipath_class) { | |
2465 | class_destroy(ipath_class); | |
2466 | ipath_class = NULL; | |
2467 | } | |
2468 | ||
2469 | unregister_chrdev_region(dev, IPATH_NMINORS); | |
2470 | } | |
2471 | ||
2472 | static atomic_t user_count = ATOMIC_INIT(0); | |
2473 | static atomic_t user_setup = ATOMIC_INIT(0); | |
2474 | ||
2475 | int ipath_user_add(struct ipath_devdata *dd) | |
2476 | { | |
2477 | char name[10]; | |
2478 | int ret; | |
2479 | ||
2480 | if (atomic_inc_return(&user_count) == 1) { | |
2481 | ret = user_init(); | |
2482 | if (ret < 0) { | |
2483 | ipath_dev_err(dd, "Unable to set up user support: " | |
2484 | "error %d\n", -ret); | |
2485 | goto bail; | |
2486 | } | |
7f510b46 BS |
2487 | ret = init_cdev(0, "ipath", &ipath_file_ops, &wildcard_cdev, |
2488 | &wildcard_class_dev); | |
2489 | if (ret < 0) { | |
2490 | ipath_dev_err(dd, "Could not create wildcard " | |
2491 | "minor: error %d\n", -ret); | |
0fd41363 | 2492 | goto bail_user; |
7f510b46 BS |
2493 | } |
2494 | ||
2495 | atomic_set(&user_setup, 1); | |
2496 | } | |
2497 | ||
2498 | snprintf(name, sizeof(name), "ipath%d", dd->ipath_unit); | |
2499 | ||
2500 | ret = init_cdev(dd->ipath_unit + 1, name, &ipath_file_ops, | |
a2acb2ff | 2501 | &dd->user_cdev, &dd->user_class_dev); |
7f510b46 BS |
2502 | if (ret < 0) |
2503 | ipath_dev_err(dd, "Could not create user minor %d, %s\n", | |
2504 | dd->ipath_unit + 1, name); | |
2505 | ||
2506 | goto bail; | |
2507 | ||
0fd41363 | 2508 | bail_user: |
7f510b46 BS |
2509 | user_cleanup(); |
2510 | bail: | |
2511 | return ret; | |
2512 | } | |
2513 | ||
a2acb2ff | 2514 | void ipath_user_remove(struct ipath_devdata *dd) |
7f510b46 | 2515 | { |
a2acb2ff | 2516 | cleanup_cdev(&dd->user_cdev, &dd->user_class_dev); |
7f510b46 BS |
2517 | |
2518 | if (atomic_dec_return(&user_count) == 0) { | |
2519 | if (atomic_read(&user_setup) == 0) | |
2520 | goto bail; | |
2521 | ||
2522 | cleanup_cdev(&wildcard_cdev, &wildcard_class_dev); | |
7f510b46 BS |
2523 | user_cleanup(); |
2524 | ||
2525 | atomic_set(&user_setup, 0); | |
2526 | } | |
2527 | bail: | |
2528 | return; | |
2529 | } |