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f931551b | 1 | /* |
c804f072 | 2 | * Copyright (c) 2012, 2013 Intel Corporation. All rights reserved. |
7fac3301 | 3 | * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved. |
f931551b RC |
4 | * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved. |
5 | * | |
6 | * This software is available to you under a choice of one of two | |
7 | * licenses. You may choose to be licensed under the terms of the GNU | |
8 | * General Public License (GPL) Version 2, available from the file | |
9 | * COPYING in the main directory of this source tree, or the | |
10 | * OpenIB.org BSD license below: | |
11 | * | |
12 | * Redistribution and use in source and binary forms, with or | |
13 | * without modification, are permitted provided that the following | |
14 | * conditions are met: | |
15 | * | |
16 | * - Redistributions of source code must retain the above | |
17 | * copyright notice, this list of conditions and the following | |
18 | * disclaimer. | |
19 | * | |
20 | * - Redistributions in binary form must reproduce the above | |
21 | * copyright notice, this list of conditions and the following | |
22 | * disclaimer in the documentation and/or other materials | |
23 | * provided with the distribution. | |
24 | * | |
25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
26 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
27 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
28 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
29 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
30 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
31 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
32 | * SOFTWARE. | |
33 | */ | |
34 | ||
35 | #include <linux/pci.h> | |
36 | #include <linux/poll.h> | |
37 | #include <linux/cdev.h> | |
38 | #include <linux/swap.h> | |
39 | #include <linux/vmalloc.h> | |
40 | #include <linux/highmem.h> | |
41 | #include <linux/io.h> | |
f931551b RC |
42 | #include <linux/jiffies.h> |
43 | #include <asm/pgtable.h> | |
44 | #include <linux/delay.h> | |
b108d976 | 45 | #include <linux/export.h> |
49617725 | 46 | #include <linux/uio.h> |
f931551b RC |
47 | |
48 | #include "qib.h" | |
49 | #include "qib_common.h" | |
50 | #include "qib_user_sdma.h" | |
51 | ||
7fac3301 MM |
52 | #undef pr_fmt |
53 | #define pr_fmt(fmt) QIB_DRV_NAME ": " fmt | |
54 | ||
f931551b RC |
55 | static int qib_open(struct inode *, struct file *); |
56 | static int qib_close(struct inode *, struct file *); | |
57 | static ssize_t qib_write(struct file *, const char __user *, size_t, loff_t *); | |
49617725 | 58 | static ssize_t qib_write_iter(struct kiocb *, struct iov_iter *); |
f931551b RC |
59 | static unsigned int qib_poll(struct file *, struct poll_table_struct *); |
60 | static int qib_mmapf(struct file *, struct vm_area_struct *); | |
61 | ||
49617725 AV |
62 | /* |
63 | * This is really, really weird shit - write() and writev() here | |
64 | * have completely unrelated semantics. Sucky userland ABI, | |
65 | * film at 11. | |
66 | */ | |
f931551b RC |
67 | static const struct file_operations qib_file_ops = { |
68 | .owner = THIS_MODULE, | |
69 | .write = qib_write, | |
49617725 | 70 | .write_iter = qib_write_iter, |
f931551b RC |
71 | .open = qib_open, |
72 | .release = qib_close, | |
73 | .poll = qib_poll, | |
6038f373 AB |
74 | .mmap = qib_mmapf, |
75 | .llseek = noop_llseek, | |
f931551b RC |
76 | }; |
77 | ||
78 | /* | |
79 | * Convert kernel virtual addresses to physical addresses so they don't | |
80 | * potentially conflict with the chip addresses used as mmap offsets. | |
81 | * It doesn't really matter what mmap offset we use as long as we can | |
82 | * interpret it correctly. | |
83 | */ | |
84 | static u64 cvt_kvaddr(void *p) | |
85 | { | |
86 | struct page *page; | |
87 | u64 paddr = 0; | |
88 | ||
89 | page = vmalloc_to_page(p); | |
90 | if (page) | |
91 | paddr = page_to_pfn(page) << PAGE_SHIFT; | |
92 | ||
93 | return paddr; | |
94 | } | |
95 | ||
96 | static int qib_get_base_info(struct file *fp, void __user *ubase, | |
97 | size_t ubase_size) | |
98 | { | |
99 | struct qib_ctxtdata *rcd = ctxt_fp(fp); | |
100 | int ret = 0; | |
101 | struct qib_base_info *kinfo = NULL; | |
102 | struct qib_devdata *dd = rcd->dd; | |
103 | struct qib_pportdata *ppd = rcd->ppd; | |
104 | unsigned subctxt_cnt; | |
105 | int shared, master; | |
106 | size_t sz; | |
107 | ||
108 | subctxt_cnt = rcd->subctxt_cnt; | |
109 | if (!subctxt_cnt) { | |
110 | shared = 0; | |
111 | master = 0; | |
112 | subctxt_cnt = 1; | |
113 | } else { | |
114 | shared = 1; | |
115 | master = !subctxt_fp(fp); | |
116 | } | |
117 | ||
118 | sz = sizeof(*kinfo); | |
119 | /* If context sharing is not requested, allow the old size structure */ | |
120 | if (!shared) | |
121 | sz -= 7 * sizeof(u64); | |
122 | if (ubase_size < sz) { | |
123 | ret = -EINVAL; | |
124 | goto bail; | |
125 | } | |
126 | ||
127 | kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL); | |
128 | if (kinfo == NULL) { | |
129 | ret = -ENOMEM; | |
130 | goto bail; | |
131 | } | |
132 | ||
133 | ret = dd->f_get_base_info(rcd, kinfo); | |
134 | if (ret < 0) | |
135 | goto bail; | |
136 | ||
137 | kinfo->spi_rcvhdr_cnt = dd->rcvhdrcnt; | |
138 | kinfo->spi_rcvhdrent_size = dd->rcvhdrentsize; | |
139 | kinfo->spi_tidegrcnt = rcd->rcvegrcnt; | |
140 | kinfo->spi_rcv_egrbufsize = dd->rcvegrbufsize; | |
141 | /* | |
142 | * have to mmap whole thing | |
143 | */ | |
144 | kinfo->spi_rcv_egrbuftotlen = | |
145 | rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size; | |
146 | kinfo->spi_rcv_egrperchunk = rcd->rcvegrbufs_perchunk; | |
147 | kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen / | |
148 | rcd->rcvegrbuf_chunks; | |
149 | kinfo->spi_tidcnt = dd->rcvtidcnt / subctxt_cnt; | |
150 | if (master) | |
151 | kinfo->spi_tidcnt += dd->rcvtidcnt % subctxt_cnt; | |
152 | /* | |
153 | * for this use, may be cfgctxts summed over all chips that | |
154 | * are are configured and present | |
155 | */ | |
156 | kinfo->spi_nctxts = dd->cfgctxts; | |
157 | /* unit (chip/board) our context is on */ | |
158 | kinfo->spi_unit = dd->unit; | |
159 | kinfo->spi_port = ppd->port; | |
160 | /* for now, only a single page */ | |
161 | kinfo->spi_tid_maxsize = PAGE_SIZE; | |
162 | ||
163 | /* | |
164 | * Doing this per context, and based on the skip value, etc. This has | |
165 | * to be the actual buffer size, since the protocol code treats it | |
166 | * as an array. | |
167 | * | |
168 | * These have to be set to user addresses in the user code via mmap. | |
169 | * These values are used on return to user code for the mmap target | |
170 | * addresses only. For 32 bit, same 44 bit address problem, so use | |
171 | * the physical address, not virtual. Before 2.6.11, using the | |
172 | * page_address() macro worked, but in 2.6.11, even that returns the | |
173 | * full 64 bit address (upper bits all 1's). So far, using the | |
174 | * physical addresses (or chip offsets, for chip mapping) works, but | |
175 | * no doubt some future kernel release will change that, and we'll be | |
176 | * on to yet another method of dealing with this. | |
177 | * Normally only one of rcvhdr_tailaddr or rhf_offset is useful | |
178 | * since the chips with non-zero rhf_offset don't normally | |
179 | * enable tail register updates to host memory, but for testing, | |
180 | * both can be enabled and used. | |
181 | */ | |
182 | kinfo->spi_rcvhdr_base = (u64) rcd->rcvhdrq_phys; | |
183 | kinfo->spi_rcvhdr_tailaddr = (u64) rcd->rcvhdrqtailaddr_phys; | |
184 | kinfo->spi_rhf_offset = dd->rhf_offset; | |
185 | kinfo->spi_rcv_egrbufs = (u64) rcd->rcvegr_phys; | |
186 | kinfo->spi_pioavailaddr = (u64) dd->pioavailregs_phys; | |
187 | /* setup per-unit (not port) status area for user programs */ | |
188 | kinfo->spi_status = (u64) kinfo->spi_pioavailaddr + | |
189 | (char *) ppd->statusp - | |
190 | (char *) dd->pioavailregs_dma; | |
191 | kinfo->spi_uregbase = (u64) dd->uregbase + dd->ureg_align * rcd->ctxt; | |
192 | if (!shared) { | |
193 | kinfo->spi_piocnt = rcd->piocnt; | |
194 | kinfo->spi_piobufbase = (u64) rcd->piobufs; | |
195 | kinfo->spi_sendbuf_status = cvt_kvaddr(rcd->user_event_mask); | |
196 | } else if (master) { | |
197 | kinfo->spi_piocnt = (rcd->piocnt / subctxt_cnt) + | |
198 | (rcd->piocnt % subctxt_cnt); | |
199 | /* Master's PIO buffers are after all the slave's */ | |
200 | kinfo->spi_piobufbase = (u64) rcd->piobufs + | |
201 | dd->palign * | |
202 | (rcd->piocnt - kinfo->spi_piocnt); | |
203 | } else { | |
204 | unsigned slave = subctxt_fp(fp) - 1; | |
205 | ||
206 | kinfo->spi_piocnt = rcd->piocnt / subctxt_cnt; | |
207 | kinfo->spi_piobufbase = (u64) rcd->piobufs + | |
208 | dd->palign * kinfo->spi_piocnt * slave; | |
209 | } | |
210 | ||
211 | if (shared) { | |
212 | kinfo->spi_sendbuf_status = | |
213 | cvt_kvaddr(&rcd->user_event_mask[subctxt_fp(fp)]); | |
214 | /* only spi_subctxt_* fields should be set in this block! */ | |
215 | kinfo->spi_subctxt_uregbase = cvt_kvaddr(rcd->subctxt_uregbase); | |
216 | ||
217 | kinfo->spi_subctxt_rcvegrbuf = | |
218 | cvt_kvaddr(rcd->subctxt_rcvegrbuf); | |
219 | kinfo->spi_subctxt_rcvhdr_base = | |
220 | cvt_kvaddr(rcd->subctxt_rcvhdr_base); | |
221 | } | |
222 | ||
223 | /* | |
224 | * All user buffers are 2KB buffers. If we ever support | |
225 | * giving 4KB buffers to user processes, this will need some | |
226 | * work. Can't use piobufbase directly, because it has | |
227 | * both 2K and 4K buffer base values. | |
228 | */ | |
229 | kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->pio2k_bufbase) / | |
230 | dd->palign; | |
231 | kinfo->spi_pioalign = dd->palign; | |
232 | kinfo->spi_qpair = QIB_KD_QP; | |
233 | /* | |
234 | * user mode PIO buffers are always 2KB, even when 4KB can | |
235 | * be received, and sent via the kernel; this is ibmaxlen | |
236 | * for 2K MTU. | |
237 | */ | |
238 | kinfo->spi_piosize = dd->piosize2k - 2 * sizeof(u32); | |
239 | kinfo->spi_mtu = ppd->ibmaxlen; /* maxlen, not ibmtu */ | |
240 | kinfo->spi_ctxt = rcd->ctxt; | |
241 | kinfo->spi_subctxt = subctxt_fp(fp); | |
242 | kinfo->spi_sw_version = QIB_KERN_SWVERSION; | |
243 | kinfo->spi_sw_version |= 1U << 31; /* QLogic-built, not kernel.org */ | |
244 | kinfo->spi_hw_version = dd->revision; | |
245 | ||
246 | if (master) | |
247 | kinfo->spi_runtime_flags |= QIB_RUNTIME_MASTER; | |
248 | ||
249 | sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo); | |
250 | if (copy_to_user(ubase, kinfo, sz)) | |
251 | ret = -EFAULT; | |
252 | bail: | |
253 | kfree(kinfo); | |
254 | return ret; | |
255 | } | |
256 | ||
257 | /** | |
258 | * qib_tid_update - update a context TID | |
259 | * @rcd: the context | |
260 | * @fp: the qib device file | |
261 | * @ti: the TID information | |
262 | * | |
263 | * The new implementation as of Oct 2004 is that the driver assigns | |
264 | * the tid and returns it to the caller. To reduce search time, we | |
265 | * keep a cursor for each context, walking the shadow tid array to find | |
266 | * one that's not in use. | |
267 | * | |
268 | * For now, if we can't allocate the full list, we fail, although | |
269 | * in the long run, we'll allocate as many as we can, and the | |
270 | * caller will deal with that by trying the remaining pages later. | |
271 | * That means that when we fail, we have to mark the tids as not in | |
272 | * use again, in our shadow copy. | |
273 | * | |
274 | * It's up to the caller to free the tids when they are done. | |
275 | * We'll unlock the pages as they free them. | |
276 | * | |
277 | * Also, right now we are locking one page at a time, but since | |
278 | * the intended use of this routine is for a single group of | |
279 | * virtually contiguous pages, that should change to improve | |
280 | * performance. | |
281 | */ | |
282 | static int qib_tid_update(struct qib_ctxtdata *rcd, struct file *fp, | |
283 | const struct qib_tid_info *ti) | |
284 | { | |
285 | int ret = 0, ntids; | |
286 | u32 tid, ctxttid, cnt, i, tidcnt, tidoff; | |
287 | u16 *tidlist; | |
288 | struct qib_devdata *dd = rcd->dd; | |
289 | u64 physaddr; | |
290 | unsigned long vaddr; | |
291 | u64 __iomem *tidbase; | |
292 | unsigned long tidmap[8]; | |
293 | struct page **pagep = NULL; | |
294 | unsigned subctxt = subctxt_fp(fp); | |
295 | ||
296 | if (!dd->pageshadow) { | |
297 | ret = -ENOMEM; | |
298 | goto done; | |
299 | } | |
300 | ||
301 | cnt = ti->tidcnt; | |
302 | if (!cnt) { | |
303 | ret = -EFAULT; | |
304 | goto done; | |
305 | } | |
306 | ctxttid = rcd->ctxt * dd->rcvtidcnt; | |
307 | if (!rcd->subctxt_cnt) { | |
308 | tidcnt = dd->rcvtidcnt; | |
309 | tid = rcd->tidcursor; | |
310 | tidoff = 0; | |
311 | } else if (!subctxt) { | |
312 | tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) + | |
313 | (dd->rcvtidcnt % rcd->subctxt_cnt); | |
314 | tidoff = dd->rcvtidcnt - tidcnt; | |
315 | ctxttid += tidoff; | |
316 | tid = tidcursor_fp(fp); | |
317 | } else { | |
318 | tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt; | |
319 | tidoff = tidcnt * (subctxt - 1); | |
320 | ctxttid += tidoff; | |
321 | tid = tidcursor_fp(fp); | |
322 | } | |
323 | if (cnt > tidcnt) { | |
324 | /* make sure it all fits in tid_pg_list */ | |
7fac3301 MM |
325 | qib_devinfo(dd->pcidev, |
326 | "Process tried to allocate %u TIDs, only trying max (%u)\n", | |
327 | cnt, tidcnt); | |
f931551b RC |
328 | cnt = tidcnt; |
329 | } | |
330 | pagep = (struct page **) rcd->tid_pg_list; | |
331 | tidlist = (u16 *) &pagep[dd->rcvtidcnt]; | |
332 | pagep += tidoff; | |
333 | tidlist += tidoff; | |
334 | ||
335 | memset(tidmap, 0, sizeof(tidmap)); | |
336 | /* before decrement; chip actual # */ | |
337 | ntids = tidcnt; | |
338 | tidbase = (u64 __iomem *) (((char __iomem *) dd->kregbase) + | |
339 | dd->rcvtidbase + | |
340 | ctxttid * sizeof(*tidbase)); | |
341 | ||
342 | /* virtual address of first page in transfer */ | |
343 | vaddr = ti->tidvaddr; | |
344 | if (!access_ok(VERIFY_WRITE, (void __user *) vaddr, | |
345 | cnt * PAGE_SIZE)) { | |
346 | ret = -EFAULT; | |
347 | goto done; | |
348 | } | |
349 | ret = qib_get_user_pages(vaddr, cnt, pagep); | |
350 | if (ret) { | |
351 | /* | |
352 | * if (ret == -EBUSY) | |
353 | * We can't continue because the pagep array won't be | |
354 | * initialized. This should never happen, | |
355 | * unless perhaps the user has mpin'ed the pages | |
356 | * themselves. | |
357 | */ | |
a46a2802 MM |
358 | qib_devinfo( |
359 | dd->pcidev, | |
360 | "Failed to lock addr %p, %u pages: errno %d\n", | |
361 | (void *) vaddr, cnt, -ret); | |
f931551b RC |
362 | goto done; |
363 | } | |
364 | for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) { | |
365 | for (; ntids--; tid++) { | |
366 | if (tid == tidcnt) | |
367 | tid = 0; | |
368 | if (!dd->pageshadow[ctxttid + tid]) | |
369 | break; | |
370 | } | |
371 | if (ntids < 0) { | |
372 | /* | |
373 | * Oops, wrapped all the way through their TIDs, | |
374 | * and didn't have enough free; see comments at | |
375 | * start of routine | |
376 | */ | |
377 | i--; /* last tidlist[i] not filled in */ | |
378 | ret = -ENOMEM; | |
379 | break; | |
380 | } | |
381 | tidlist[i] = tid + tidoff; | |
382 | /* we "know" system pages and TID pages are same size */ | |
383 | dd->pageshadow[ctxttid + tid] = pagep[i]; | |
384 | dd->physshadow[ctxttid + tid] = | |
385 | qib_map_page(dd->pcidev, pagep[i], 0, PAGE_SIZE, | |
386 | PCI_DMA_FROMDEVICE); | |
387 | /* | |
388 | * don't need atomic or it's overhead | |
389 | */ | |
390 | __set_bit(tid, tidmap); | |
391 | physaddr = dd->physshadow[ctxttid + tid]; | |
392 | /* PERFORMANCE: below should almost certainly be cached */ | |
393 | dd->f_put_tid(dd, &tidbase[tid], | |
394 | RCVHQ_RCV_TYPE_EXPECTED, physaddr); | |
395 | /* | |
396 | * don't check this tid in qib_ctxtshadow, since we | |
397 | * just filled it in; start with the next one. | |
398 | */ | |
399 | tid++; | |
400 | } | |
401 | ||
402 | if (ret) { | |
403 | u32 limit; | |
404 | cleanup: | |
405 | /* jump here if copy out of updated info failed... */ | |
406 | /* same code that's in qib_free_tid() */ | |
407 | limit = sizeof(tidmap) * BITS_PER_BYTE; | |
408 | if (limit > tidcnt) | |
409 | /* just in case size changes in future */ | |
410 | limit = tidcnt; | |
411 | tid = find_first_bit((const unsigned long *)tidmap, limit); | |
412 | for (; tid < limit; tid++) { | |
413 | if (!test_bit(tid, tidmap)) | |
414 | continue; | |
415 | if (dd->pageshadow[ctxttid + tid]) { | |
416 | dma_addr_t phys; | |
417 | ||
418 | phys = dd->physshadow[ctxttid + tid]; | |
419 | dd->physshadow[ctxttid + tid] = dd->tidinvalid; | |
420 | /* PERFORMANCE: below should almost certainly | |
421 | * be cached | |
422 | */ | |
423 | dd->f_put_tid(dd, &tidbase[tid], | |
424 | RCVHQ_RCV_TYPE_EXPECTED, | |
425 | dd->tidinvalid); | |
426 | pci_unmap_page(dd->pcidev, phys, PAGE_SIZE, | |
427 | PCI_DMA_FROMDEVICE); | |
428 | dd->pageshadow[ctxttid + tid] = NULL; | |
429 | } | |
430 | } | |
431 | qib_release_user_pages(pagep, cnt); | |
432 | } else { | |
433 | /* | |
434 | * Copy the updated array, with qib_tid's filled in, back | |
435 | * to user. Since we did the copy in already, this "should | |
436 | * never fail" If it does, we have to clean up... | |
437 | */ | |
438 | if (copy_to_user((void __user *) | |
439 | (unsigned long) ti->tidlist, | |
440 | tidlist, cnt * sizeof(*tidlist))) { | |
441 | ret = -EFAULT; | |
442 | goto cleanup; | |
443 | } | |
444 | if (copy_to_user((void __user *) (unsigned long) ti->tidmap, | |
041af0bb | 445 | tidmap, sizeof(tidmap))) { |
f931551b RC |
446 | ret = -EFAULT; |
447 | goto cleanup; | |
448 | } | |
449 | if (tid == tidcnt) | |
450 | tid = 0; | |
451 | if (!rcd->subctxt_cnt) | |
452 | rcd->tidcursor = tid; | |
453 | else | |
454 | tidcursor_fp(fp) = tid; | |
455 | } | |
456 | ||
457 | done: | |
458 | return ret; | |
459 | } | |
460 | ||
461 | /** | |
462 | * qib_tid_free - free a context TID | |
463 | * @rcd: the context | |
464 | * @subctxt: the subcontext | |
465 | * @ti: the TID info | |
466 | * | |
467 | * right now we are unlocking one page at a time, but since | |
468 | * the intended use of this routine is for a single group of | |
469 | * virtually contiguous pages, that should change to improve | |
470 | * performance. We check that the TID is in range for this context | |
471 | * but otherwise don't check validity; if user has an error and | |
472 | * frees the wrong tid, it's only their own data that can thereby | |
473 | * be corrupted. We do check that the TID was in use, for sanity | |
474 | * We always use our idea of the saved address, not the address that | |
475 | * they pass in to us. | |
476 | */ | |
477 | static int qib_tid_free(struct qib_ctxtdata *rcd, unsigned subctxt, | |
478 | const struct qib_tid_info *ti) | |
479 | { | |
480 | int ret = 0; | |
481 | u32 tid, ctxttid, cnt, limit, tidcnt; | |
482 | struct qib_devdata *dd = rcd->dd; | |
483 | u64 __iomem *tidbase; | |
484 | unsigned long tidmap[8]; | |
485 | ||
486 | if (!dd->pageshadow) { | |
487 | ret = -ENOMEM; | |
488 | goto done; | |
489 | } | |
490 | ||
491 | if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap, | |
041af0bb | 492 | sizeof(tidmap))) { |
f931551b RC |
493 | ret = -EFAULT; |
494 | goto done; | |
495 | } | |
496 | ||
497 | ctxttid = rcd->ctxt * dd->rcvtidcnt; | |
498 | if (!rcd->subctxt_cnt) | |
499 | tidcnt = dd->rcvtidcnt; | |
500 | else if (!subctxt) { | |
501 | tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) + | |
502 | (dd->rcvtidcnt % rcd->subctxt_cnt); | |
503 | ctxttid += dd->rcvtidcnt - tidcnt; | |
504 | } else { | |
505 | tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt; | |
506 | ctxttid += tidcnt * (subctxt - 1); | |
507 | } | |
508 | tidbase = (u64 __iomem *) ((char __iomem *)(dd->kregbase) + | |
509 | dd->rcvtidbase + | |
510 | ctxttid * sizeof(*tidbase)); | |
511 | ||
512 | limit = sizeof(tidmap) * BITS_PER_BYTE; | |
513 | if (limit > tidcnt) | |
514 | /* just in case size changes in future */ | |
515 | limit = tidcnt; | |
516 | tid = find_first_bit(tidmap, limit); | |
517 | for (cnt = 0; tid < limit; tid++) { | |
518 | /* | |
519 | * small optimization; if we detect a run of 3 or so without | |
520 | * any set, use find_first_bit again. That's mainly to | |
521 | * accelerate the case where we wrapped, so we have some at | |
522 | * the beginning, and some at the end, and a big gap | |
523 | * in the middle. | |
524 | */ | |
525 | if (!test_bit(tid, tidmap)) | |
526 | continue; | |
527 | cnt++; | |
528 | if (dd->pageshadow[ctxttid + tid]) { | |
529 | struct page *p; | |
530 | dma_addr_t phys; | |
531 | ||
532 | p = dd->pageshadow[ctxttid + tid]; | |
533 | dd->pageshadow[ctxttid + tid] = NULL; | |
534 | phys = dd->physshadow[ctxttid + tid]; | |
535 | dd->physshadow[ctxttid + tid] = dd->tidinvalid; | |
536 | /* PERFORMANCE: below should almost certainly be | |
537 | * cached | |
538 | */ | |
539 | dd->f_put_tid(dd, &tidbase[tid], | |
540 | RCVHQ_RCV_TYPE_EXPECTED, dd->tidinvalid); | |
541 | pci_unmap_page(dd->pcidev, phys, PAGE_SIZE, | |
542 | PCI_DMA_FROMDEVICE); | |
543 | qib_release_user_pages(&p, 1); | |
544 | } | |
545 | } | |
546 | done: | |
547 | return ret; | |
548 | } | |
549 | ||
550 | /** | |
551 | * qib_set_part_key - set a partition key | |
552 | * @rcd: the context | |
553 | * @key: the key | |
554 | * | |
555 | * We can have up to 4 active at a time (other than the default, which is | |
556 | * always allowed). This is somewhat tricky, since multiple contexts may set | |
557 | * the same key, so we reference count them, and clean up at exit. All 4 | |
558 | * partition keys are packed into a single qlogic_ib register. It's an | |
559 | * error for a process to set the same pkey multiple times. We provide no | |
560 | * mechanism to de-allocate a pkey at this time, we may eventually need to | |
561 | * do that. I've used the atomic operations, and no locking, and only make | |
562 | * a single pass through what's available. This should be more than | |
563 | * adequate for some time. I'll think about spinlocks or the like if and as | |
564 | * it's necessary. | |
565 | */ | |
566 | static int qib_set_part_key(struct qib_ctxtdata *rcd, u16 key) | |
567 | { | |
568 | struct qib_pportdata *ppd = rcd->ppd; | |
569 | int i, any = 0, pidx = -1; | |
570 | u16 lkey = key & 0x7FFF; | |
571 | int ret; | |
572 | ||
573 | if (lkey == (QIB_DEFAULT_P_KEY & 0x7FFF)) { | |
574 | /* nothing to do; this key always valid */ | |
575 | ret = 0; | |
576 | goto bail; | |
577 | } | |
578 | ||
579 | if (!lkey) { | |
580 | ret = -EINVAL; | |
581 | goto bail; | |
582 | } | |
583 | ||
584 | /* | |
585 | * Set the full membership bit, because it has to be | |
586 | * set in the register or the packet, and it seems | |
587 | * cleaner to set in the register than to force all | |
588 | * callers to set it. | |
589 | */ | |
590 | key |= 0x8000; | |
591 | ||
592 | for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) { | |
593 | if (!rcd->pkeys[i] && pidx == -1) | |
594 | pidx = i; | |
595 | if (rcd->pkeys[i] == key) { | |
596 | ret = -EEXIST; | |
597 | goto bail; | |
598 | } | |
599 | } | |
600 | if (pidx == -1) { | |
601 | ret = -EBUSY; | |
602 | goto bail; | |
603 | } | |
604 | for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) { | |
605 | if (!ppd->pkeys[i]) { | |
606 | any++; | |
607 | continue; | |
608 | } | |
609 | if (ppd->pkeys[i] == key) { | |
610 | atomic_t *pkrefs = &ppd->pkeyrefs[i]; | |
611 | ||
612 | if (atomic_inc_return(pkrefs) > 1) { | |
613 | rcd->pkeys[pidx] = key; | |
614 | ret = 0; | |
615 | goto bail; | |
616 | } else { | |
617 | /* | |
618 | * lost race, decrement count, catch below | |
619 | */ | |
620 | atomic_dec(pkrefs); | |
621 | any++; | |
622 | } | |
623 | } | |
624 | if ((ppd->pkeys[i] & 0x7FFF) == lkey) { | |
625 | /* | |
626 | * It makes no sense to have both the limited and | |
627 | * full membership PKEY set at the same time since | |
628 | * the unlimited one will disable the limited one. | |
629 | */ | |
630 | ret = -EEXIST; | |
631 | goto bail; | |
632 | } | |
633 | } | |
634 | if (!any) { | |
635 | ret = -EBUSY; | |
636 | goto bail; | |
637 | } | |
638 | for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) { | |
639 | if (!ppd->pkeys[i] && | |
640 | atomic_inc_return(&ppd->pkeyrefs[i]) == 1) { | |
641 | rcd->pkeys[pidx] = key; | |
642 | ppd->pkeys[i] = key; | |
643 | (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0); | |
644 | ret = 0; | |
645 | goto bail; | |
646 | } | |
647 | } | |
648 | ret = -EBUSY; | |
649 | ||
650 | bail: | |
651 | return ret; | |
652 | } | |
653 | ||
654 | /** | |
655 | * qib_manage_rcvq - manage a context's receive queue | |
656 | * @rcd: the context | |
657 | * @subctxt: the subcontext | |
658 | * @start_stop: action to carry out | |
659 | * | |
660 | * start_stop == 0 disables receive on the context, for use in queue | |
661 | * overflow conditions. start_stop==1 re-enables, to be used to | |
662 | * re-init the software copy of the head register | |
663 | */ | |
664 | static int qib_manage_rcvq(struct qib_ctxtdata *rcd, unsigned subctxt, | |
665 | int start_stop) | |
666 | { | |
667 | struct qib_devdata *dd = rcd->dd; | |
668 | unsigned int rcvctrl_op; | |
669 | ||
670 | if (subctxt) | |
671 | goto bail; | |
672 | /* atomically clear receive enable ctxt. */ | |
673 | if (start_stop) { | |
674 | /* | |
675 | * On enable, force in-memory copy of the tail register to | |
676 | * 0, so that protocol code doesn't have to worry about | |
677 | * whether or not the chip has yet updated the in-memory | |
678 | * copy or not on return from the system call. The chip | |
679 | * always resets it's tail register back to 0 on a | |
680 | * transition from disabled to enabled. | |
681 | */ | |
682 | if (rcd->rcvhdrtail_kvaddr) | |
683 | qib_clear_rcvhdrtail(rcd); | |
684 | rcvctrl_op = QIB_RCVCTRL_CTXT_ENB; | |
685 | } else | |
686 | rcvctrl_op = QIB_RCVCTRL_CTXT_DIS; | |
687 | dd->f_rcvctrl(rcd->ppd, rcvctrl_op, rcd->ctxt); | |
688 | /* always; new head should be equal to new tail; see above */ | |
689 | bail: | |
690 | return 0; | |
691 | } | |
692 | ||
693 | static void qib_clean_part_key(struct qib_ctxtdata *rcd, | |
694 | struct qib_devdata *dd) | |
695 | { | |
696 | int i, j, pchanged = 0; | |
697 | u64 oldpkey; | |
698 | struct qib_pportdata *ppd = rcd->ppd; | |
699 | ||
700 | /* for debugging only */ | |
701 | oldpkey = (u64) ppd->pkeys[0] | | |
702 | ((u64) ppd->pkeys[1] << 16) | | |
703 | ((u64) ppd->pkeys[2] << 32) | | |
704 | ((u64) ppd->pkeys[3] << 48); | |
705 | ||
706 | for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) { | |
707 | if (!rcd->pkeys[i]) | |
708 | continue; | |
709 | for (j = 0; j < ARRAY_SIZE(ppd->pkeys); j++) { | |
710 | /* check for match independent of the global bit */ | |
711 | if ((ppd->pkeys[j] & 0x7fff) != | |
712 | (rcd->pkeys[i] & 0x7fff)) | |
713 | continue; | |
714 | if (atomic_dec_and_test(&ppd->pkeyrefs[j])) { | |
715 | ppd->pkeys[j] = 0; | |
716 | pchanged++; | |
717 | } | |
718 | break; | |
719 | } | |
720 | rcd->pkeys[i] = 0; | |
721 | } | |
722 | if (pchanged) | |
723 | (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0); | |
724 | } | |
725 | ||
726 | /* common code for the mappings on dma_alloc_coherent mem */ | |
727 | static int qib_mmap_mem(struct vm_area_struct *vma, struct qib_ctxtdata *rcd, | |
728 | unsigned len, void *kvaddr, u32 write_ok, char *what) | |
729 | { | |
730 | struct qib_devdata *dd = rcd->dd; | |
731 | unsigned long pfn; | |
732 | int ret; | |
733 | ||
734 | if ((vma->vm_end - vma->vm_start) > len) { | |
735 | qib_devinfo(dd->pcidev, | |
736 | "FAIL on %s: len %lx > %x\n", what, | |
737 | vma->vm_end - vma->vm_start, len); | |
738 | ret = -EFAULT; | |
739 | goto bail; | |
740 | } | |
741 | ||
742 | /* | |
743 | * shared context user code requires rcvhdrq mapped r/w, others | |
744 | * only allowed readonly mapping. | |
745 | */ | |
746 | if (!write_ok) { | |
747 | if (vma->vm_flags & VM_WRITE) { | |
748 | qib_devinfo(dd->pcidev, | |
749 | "%s must be mapped readonly\n", what); | |
750 | ret = -EPERM; | |
751 | goto bail; | |
752 | } | |
753 | ||
754 | /* don't allow them to later change with mprotect */ | |
755 | vma->vm_flags &= ~VM_MAYWRITE; | |
756 | } | |
757 | ||
758 | pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT; | |
759 | ret = remap_pfn_range(vma, vma->vm_start, pfn, | |
760 | len, vma->vm_page_prot); | |
761 | if (ret) | |
7fac3301 MM |
762 | qib_devinfo(dd->pcidev, |
763 | "%s ctxt%u mmap of %lx, %x bytes failed: %d\n", | |
764 | what, rcd->ctxt, pfn, len, ret); | |
f931551b RC |
765 | bail: |
766 | return ret; | |
767 | } | |
768 | ||
769 | static int mmap_ureg(struct vm_area_struct *vma, struct qib_devdata *dd, | |
770 | u64 ureg) | |
771 | { | |
772 | unsigned long phys; | |
773 | unsigned long sz; | |
774 | int ret; | |
775 | ||
776 | /* | |
777 | * This is real hardware, so use io_remap. This is the mechanism | |
778 | * for the user process to update the head registers for their ctxt | |
779 | * in the chip. | |
780 | */ | |
781 | sz = dd->flags & QIB_HAS_HDRSUPP ? 2 * PAGE_SIZE : PAGE_SIZE; | |
782 | if ((vma->vm_end - vma->vm_start) > sz) { | |
7fac3301 MM |
783 | qib_devinfo(dd->pcidev, |
784 | "FAIL mmap userreg: reqlen %lx > PAGE\n", | |
785 | vma->vm_end - vma->vm_start); | |
f931551b RC |
786 | ret = -EFAULT; |
787 | } else { | |
788 | phys = dd->physaddr + ureg; | |
789 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
790 | ||
791 | vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; | |
792 | ret = io_remap_pfn_range(vma, vma->vm_start, | |
793 | phys >> PAGE_SHIFT, | |
794 | vma->vm_end - vma->vm_start, | |
795 | vma->vm_page_prot); | |
796 | } | |
797 | return ret; | |
798 | } | |
799 | ||
800 | static int mmap_piobufs(struct vm_area_struct *vma, | |
801 | struct qib_devdata *dd, | |
802 | struct qib_ctxtdata *rcd, | |
803 | unsigned piobufs, unsigned piocnt) | |
804 | { | |
805 | unsigned long phys; | |
806 | int ret; | |
807 | ||
808 | /* | |
809 | * When we map the PIO buffers in the chip, we want to map them as | |
810 | * writeonly, no read possible; unfortunately, x86 doesn't allow | |
811 | * for this in hardware, but we still prevent users from asking | |
812 | * for it. | |
813 | */ | |
814 | if ((vma->vm_end - vma->vm_start) > (piocnt * dd->palign)) { | |
7fac3301 MM |
815 | qib_devinfo(dd->pcidev, |
816 | "FAIL mmap piobufs: reqlen %lx > PAGE\n", | |
f931551b RC |
817 | vma->vm_end - vma->vm_start); |
818 | ret = -EINVAL; | |
819 | goto bail; | |
820 | } | |
821 | ||
822 | phys = dd->physaddr + piobufs; | |
823 | ||
824 | #if defined(__powerpc__) | |
825 | /* There isn't a generic way to specify writethrough mappings */ | |
826 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; | |
827 | pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU; | |
828 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED; | |
829 | #endif | |
830 | ||
831 | /* | |
832 | * don't allow them to later change to readable with mprotect (for when | |
833 | * not initially mapped readable, as is normally the case) | |
834 | */ | |
835 | vma->vm_flags &= ~VM_MAYREAD; | |
836 | vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; | |
837 | ||
d4988623 LR |
838 | /* We used PAT if wc_cookie == 0 */ |
839 | if (!dd->wc_cookie) | |
f931551b RC |
840 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
841 | ||
842 | ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT, | |
843 | vma->vm_end - vma->vm_start, | |
844 | vma->vm_page_prot); | |
845 | bail: | |
846 | return ret; | |
847 | } | |
848 | ||
849 | static int mmap_rcvegrbufs(struct vm_area_struct *vma, | |
850 | struct qib_ctxtdata *rcd) | |
851 | { | |
852 | struct qib_devdata *dd = rcd->dd; | |
853 | unsigned long start, size; | |
854 | size_t total_size, i; | |
855 | unsigned long pfn; | |
856 | int ret; | |
857 | ||
858 | size = rcd->rcvegrbuf_size; | |
859 | total_size = rcd->rcvegrbuf_chunks * size; | |
860 | if ((vma->vm_end - vma->vm_start) > total_size) { | |
7fac3301 MM |
861 | qib_devinfo(dd->pcidev, |
862 | "FAIL on egr bufs: reqlen %lx > actual %lx\n", | |
f931551b RC |
863 | vma->vm_end - vma->vm_start, |
864 | (unsigned long) total_size); | |
865 | ret = -EINVAL; | |
866 | goto bail; | |
867 | } | |
868 | ||
869 | if (vma->vm_flags & VM_WRITE) { | |
7fac3301 MM |
870 | qib_devinfo(dd->pcidev, |
871 | "Can't map eager buffers as writable (flags=%lx)\n", | |
872 | vma->vm_flags); | |
f931551b RC |
873 | ret = -EPERM; |
874 | goto bail; | |
875 | } | |
876 | /* don't allow them to later change to writeable with mprotect */ | |
877 | vma->vm_flags &= ~VM_MAYWRITE; | |
878 | ||
879 | start = vma->vm_start; | |
880 | ||
881 | for (i = 0; i < rcd->rcvegrbuf_chunks; i++, start += size) { | |
882 | pfn = virt_to_phys(rcd->rcvegrbuf[i]) >> PAGE_SHIFT; | |
883 | ret = remap_pfn_range(vma, start, pfn, size, | |
884 | vma->vm_page_prot); | |
885 | if (ret < 0) | |
886 | goto bail; | |
887 | } | |
888 | ret = 0; | |
889 | ||
890 | bail: | |
891 | return ret; | |
892 | } | |
893 | ||
894 | /* | |
895 | * qib_file_vma_fault - handle a VMA page fault. | |
896 | */ | |
897 | static int qib_file_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
898 | { | |
899 | struct page *page; | |
900 | ||
901 | page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT)); | |
902 | if (!page) | |
903 | return VM_FAULT_SIGBUS; | |
904 | ||
905 | get_page(page); | |
906 | vmf->page = page; | |
907 | ||
908 | return 0; | |
909 | } | |
910 | ||
7cbea8dc | 911 | static const struct vm_operations_struct qib_file_vm_ops = { |
f931551b RC |
912 | .fault = qib_file_vma_fault, |
913 | }; | |
914 | ||
915 | static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr, | |
916 | struct qib_ctxtdata *rcd, unsigned subctxt) | |
917 | { | |
918 | struct qib_devdata *dd = rcd->dd; | |
919 | unsigned subctxt_cnt; | |
920 | unsigned long len; | |
921 | void *addr; | |
922 | size_t size; | |
923 | int ret = 0; | |
924 | ||
925 | subctxt_cnt = rcd->subctxt_cnt; | |
926 | size = rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size; | |
927 | ||
928 | /* | |
929 | * Each process has all the subctxt uregbase, rcvhdrq, and | |
930 | * rcvegrbufs mmapped - as an array for all the processes, | |
931 | * and also separately for this process. | |
932 | */ | |
933 | if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase)) { | |
934 | addr = rcd->subctxt_uregbase; | |
935 | size = PAGE_SIZE * subctxt_cnt; | |
936 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base)) { | |
937 | addr = rcd->subctxt_rcvhdr_base; | |
938 | size = rcd->rcvhdrq_size * subctxt_cnt; | |
939 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf)) { | |
940 | addr = rcd->subctxt_rcvegrbuf; | |
941 | size *= subctxt_cnt; | |
942 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase + | |
943 | PAGE_SIZE * subctxt)) { | |
944 | addr = rcd->subctxt_uregbase + PAGE_SIZE * subctxt; | |
945 | size = PAGE_SIZE; | |
946 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base + | |
947 | rcd->rcvhdrq_size * subctxt)) { | |
948 | addr = rcd->subctxt_rcvhdr_base + | |
949 | rcd->rcvhdrq_size * subctxt; | |
950 | size = rcd->rcvhdrq_size; | |
951 | } else if (pgaddr == cvt_kvaddr(&rcd->user_event_mask[subctxt])) { | |
952 | addr = rcd->user_event_mask; | |
953 | size = PAGE_SIZE; | |
954 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf + | |
955 | size * subctxt)) { | |
956 | addr = rcd->subctxt_rcvegrbuf + size * subctxt; | |
957 | /* rcvegrbufs are read-only on the slave */ | |
958 | if (vma->vm_flags & VM_WRITE) { | |
959 | qib_devinfo(dd->pcidev, | |
a46a2802 MM |
960 | "Can't map eager buffers as writable (flags=%lx)\n", |
961 | vma->vm_flags); | |
f931551b RC |
962 | ret = -EPERM; |
963 | goto bail; | |
964 | } | |
965 | /* | |
966 | * Don't allow permission to later change to writeable | |
967 | * with mprotect. | |
968 | */ | |
969 | vma->vm_flags &= ~VM_MAYWRITE; | |
970 | } else | |
971 | goto bail; | |
972 | len = vma->vm_end - vma->vm_start; | |
973 | if (len > size) { | |
974 | ret = -EINVAL; | |
975 | goto bail; | |
976 | } | |
977 | ||
978 | vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT; | |
979 | vma->vm_ops = &qib_file_vm_ops; | |
314e51b9 | 980 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
f931551b RC |
981 | ret = 1; |
982 | ||
983 | bail: | |
984 | return ret; | |
985 | } | |
986 | ||
987 | /** | |
988 | * qib_mmapf - mmap various structures into user space | |
989 | * @fp: the file pointer | |
990 | * @vma: the VM area | |
991 | * | |
992 | * We use this to have a shared buffer between the kernel and the user code | |
993 | * for the rcvhdr queue, egr buffers, and the per-context user regs and pio | |
994 | * buffers in the chip. We have the open and close entries so we can bump | |
995 | * the ref count and keep the driver from being unloaded while still mapped. | |
996 | */ | |
997 | static int qib_mmapf(struct file *fp, struct vm_area_struct *vma) | |
998 | { | |
999 | struct qib_ctxtdata *rcd; | |
1000 | struct qib_devdata *dd; | |
1001 | u64 pgaddr, ureg; | |
1002 | unsigned piobufs, piocnt; | |
1003 | int ret, match = 1; | |
1004 | ||
1005 | rcd = ctxt_fp(fp); | |
1006 | if (!rcd || !(vma->vm_flags & VM_SHARED)) { | |
1007 | ret = -EINVAL; | |
1008 | goto bail; | |
1009 | } | |
1010 | dd = rcd->dd; | |
1011 | ||
1012 | /* | |
1013 | * This is the qib_do_user_init() code, mapping the shared buffers | |
1014 | * and per-context user registers into the user process. The address | |
1015 | * referred to by vm_pgoff is the file offset passed via mmap(). | |
1016 | * For shared contexts, this is the kernel vmalloc() address of the | |
1017 | * pages to share with the master. | |
1018 | * For non-shared or master ctxts, this is a physical address. | |
1019 | * We only do one mmap for each space mapped. | |
1020 | */ | |
1021 | pgaddr = vma->vm_pgoff << PAGE_SHIFT; | |
1022 | ||
1023 | /* | |
1024 | * Check for 0 in case one of the allocations failed, but user | |
1025 | * called mmap anyway. | |
1026 | */ | |
1027 | if (!pgaddr) { | |
1028 | ret = -EINVAL; | |
1029 | goto bail; | |
1030 | } | |
1031 | ||
1032 | /* | |
1033 | * Physical addresses must fit in 40 bits for our hardware. | |
1034 | * Check for kernel virtual addresses first, anything else must | |
1035 | * match a HW or memory address. | |
1036 | */ | |
1037 | ret = mmap_kvaddr(vma, pgaddr, rcd, subctxt_fp(fp)); | |
1038 | if (ret) { | |
1039 | if (ret > 0) | |
1040 | ret = 0; | |
1041 | goto bail; | |
1042 | } | |
1043 | ||
1044 | ureg = dd->uregbase + dd->ureg_align * rcd->ctxt; | |
1045 | if (!rcd->subctxt_cnt) { | |
1046 | /* ctxt is not shared */ | |
1047 | piocnt = rcd->piocnt; | |
1048 | piobufs = rcd->piobufs; | |
1049 | } else if (!subctxt_fp(fp)) { | |
1050 | /* caller is the master */ | |
1051 | piocnt = (rcd->piocnt / rcd->subctxt_cnt) + | |
1052 | (rcd->piocnt % rcd->subctxt_cnt); | |
1053 | piobufs = rcd->piobufs + | |
1054 | dd->palign * (rcd->piocnt - piocnt); | |
1055 | } else { | |
1056 | unsigned slave = subctxt_fp(fp) - 1; | |
1057 | ||
1058 | /* caller is a slave */ | |
1059 | piocnt = rcd->piocnt / rcd->subctxt_cnt; | |
1060 | piobufs = rcd->piobufs + dd->palign * piocnt * slave; | |
1061 | } | |
1062 | ||
1063 | if (pgaddr == ureg) | |
1064 | ret = mmap_ureg(vma, dd, ureg); | |
1065 | else if (pgaddr == piobufs) | |
1066 | ret = mmap_piobufs(vma, dd, rcd, piobufs, piocnt); | |
1067 | else if (pgaddr == dd->pioavailregs_phys) | |
1068 | /* in-memory copy of pioavail registers */ | |
1069 | ret = qib_mmap_mem(vma, rcd, PAGE_SIZE, | |
1070 | (void *) dd->pioavailregs_dma, 0, | |
1071 | "pioavail registers"); | |
1072 | else if (pgaddr == rcd->rcvegr_phys) | |
1073 | ret = mmap_rcvegrbufs(vma, rcd); | |
1074 | else if (pgaddr == (u64) rcd->rcvhdrq_phys) | |
1075 | /* | |
1076 | * The rcvhdrq itself; multiple pages, contiguous | |
1077 | * from an i/o perspective. Shared contexts need | |
1078 | * to map r/w, so we allow writing. | |
1079 | */ | |
1080 | ret = qib_mmap_mem(vma, rcd, rcd->rcvhdrq_size, | |
1081 | rcd->rcvhdrq, 1, "rcvhdrq"); | |
1082 | else if (pgaddr == (u64) rcd->rcvhdrqtailaddr_phys) | |
1083 | /* in-memory copy of rcvhdrq tail register */ | |
1084 | ret = qib_mmap_mem(vma, rcd, PAGE_SIZE, | |
1085 | rcd->rcvhdrtail_kvaddr, 0, | |
1086 | "rcvhdrq tail"); | |
1087 | else | |
1088 | match = 0; | |
1089 | if (!match) | |
1090 | ret = -EINVAL; | |
1091 | ||
1092 | vma->vm_private_data = NULL; | |
1093 | ||
1094 | if (ret < 0) | |
1095 | qib_devinfo(dd->pcidev, | |
1096 | "mmap Failure %d: off %llx len %lx\n", | |
1097 | -ret, (unsigned long long)pgaddr, | |
1098 | vma->vm_end - vma->vm_start); | |
1099 | bail: | |
1100 | return ret; | |
1101 | } | |
1102 | ||
1103 | static unsigned int qib_poll_urgent(struct qib_ctxtdata *rcd, | |
1104 | struct file *fp, | |
1105 | struct poll_table_struct *pt) | |
1106 | { | |
1107 | struct qib_devdata *dd = rcd->dd; | |
1108 | unsigned pollflag; | |
1109 | ||
1110 | poll_wait(fp, &rcd->wait, pt); | |
1111 | ||
1112 | spin_lock_irq(&dd->uctxt_lock); | |
1113 | if (rcd->urgent != rcd->urgent_poll) { | |
1114 | pollflag = POLLIN | POLLRDNORM; | |
1115 | rcd->urgent_poll = rcd->urgent; | |
1116 | } else { | |
1117 | pollflag = 0; | |
1118 | set_bit(QIB_CTXT_WAITING_URG, &rcd->flag); | |
1119 | } | |
1120 | spin_unlock_irq(&dd->uctxt_lock); | |
1121 | ||
1122 | return pollflag; | |
1123 | } | |
1124 | ||
1125 | static unsigned int qib_poll_next(struct qib_ctxtdata *rcd, | |
1126 | struct file *fp, | |
1127 | struct poll_table_struct *pt) | |
1128 | { | |
1129 | struct qib_devdata *dd = rcd->dd; | |
1130 | unsigned pollflag; | |
1131 | ||
1132 | poll_wait(fp, &rcd->wait, pt); | |
1133 | ||
1134 | spin_lock_irq(&dd->uctxt_lock); | |
1135 | if (dd->f_hdrqempty(rcd)) { | |
1136 | set_bit(QIB_CTXT_WAITING_RCV, &rcd->flag); | |
1137 | dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_INTRAVAIL_ENB, rcd->ctxt); | |
1138 | pollflag = 0; | |
1139 | } else | |
1140 | pollflag = POLLIN | POLLRDNORM; | |
1141 | spin_unlock_irq(&dd->uctxt_lock); | |
1142 | ||
1143 | return pollflag; | |
1144 | } | |
1145 | ||
1146 | static unsigned int qib_poll(struct file *fp, struct poll_table_struct *pt) | |
1147 | { | |
1148 | struct qib_ctxtdata *rcd; | |
1149 | unsigned pollflag; | |
1150 | ||
1151 | rcd = ctxt_fp(fp); | |
1152 | if (!rcd) | |
1153 | pollflag = POLLERR; | |
1154 | else if (rcd->poll_type == QIB_POLL_TYPE_URGENT) | |
1155 | pollflag = qib_poll_urgent(rcd, fp, pt); | |
1156 | else if (rcd->poll_type == QIB_POLL_TYPE_ANYRCV) | |
1157 | pollflag = qib_poll_next(rcd, fp, pt); | |
1158 | else /* invalid */ | |
1159 | pollflag = POLLERR; | |
1160 | ||
1161 | return pollflag; | |
1162 | } | |
1163 | ||
c804f072 RV |
1164 | static void assign_ctxt_affinity(struct file *fp, struct qib_devdata *dd) |
1165 | { | |
1166 | struct qib_filedata *fd = fp->private_data; | |
1167 | const unsigned int weight = cpumask_weight(¤t->cpus_allowed); | |
1168 | const struct cpumask *local_mask = cpumask_of_pcibus(dd->pcidev->bus); | |
1169 | int local_cpu; | |
1170 | ||
1171 | /* | |
1172 | * If process has NOT already set it's affinity, select and | |
1173 | * reserve a processor for it on the local NUMA node. | |
1174 | */ | |
1175 | if ((weight >= qib_cpulist_count) && | |
1176 | (cpumask_weight(local_mask) <= qib_cpulist_count)) { | |
1177 | for_each_cpu(local_cpu, local_mask) | |
1178 | if (!test_and_set_bit(local_cpu, qib_cpulist)) { | |
1179 | fd->rec_cpu_num = local_cpu; | |
1180 | return; | |
1181 | } | |
1182 | } | |
1183 | ||
1184 | /* | |
1185 | * If process has NOT already set it's affinity, select and | |
1186 | * reserve a processor for it, as a rendevous for all | |
1187 | * users of the driver. If they don't actually later | |
1188 | * set affinity to this cpu, or set it to some other cpu, | |
1189 | * it just means that sooner or later we don't recommend | |
1190 | * a cpu, and let the scheduler do it's best. | |
1191 | */ | |
1192 | if (weight >= qib_cpulist_count) { | |
1193 | int cpu; | |
da12c1f6 | 1194 | |
c804f072 RV |
1195 | cpu = find_first_zero_bit(qib_cpulist, |
1196 | qib_cpulist_count); | |
1197 | if (cpu == qib_cpulist_count) | |
1198 | qib_dev_err(dd, | |
1199 | "no cpus avail for affinity PID %u\n", | |
1200 | current->pid); | |
1201 | else { | |
1202 | __set_bit(cpu, qib_cpulist); | |
1203 | fd->rec_cpu_num = cpu; | |
1204 | } | |
1205 | } | |
1206 | } | |
1207 | ||
f931551b RC |
1208 | /* |
1209 | * Check that userland and driver are compatible for subcontexts. | |
1210 | */ | |
1211 | static int qib_compatible_subctxts(int user_swmajor, int user_swminor) | |
1212 | { | |
1213 | /* this code is written long-hand for clarity */ | |
1214 | if (QIB_USER_SWMAJOR != user_swmajor) { | |
1215 | /* no promise of compatibility if major mismatch */ | |
1216 | return 0; | |
1217 | } | |
1218 | if (QIB_USER_SWMAJOR == 1) { | |
1219 | switch (QIB_USER_SWMINOR) { | |
1220 | case 0: | |
1221 | case 1: | |
1222 | case 2: | |
1223 | /* no subctxt implementation so cannot be compatible */ | |
1224 | return 0; | |
1225 | case 3: | |
1226 | /* 3 is only compatible with itself */ | |
1227 | return user_swminor == 3; | |
1228 | default: | |
1229 | /* >= 4 are compatible (or are expected to be) */ | |
4668e4b5 | 1230 | return user_swminor <= QIB_USER_SWMINOR; |
f931551b RC |
1231 | } |
1232 | } | |
1233 | /* make no promises yet for future major versions */ | |
1234 | return 0; | |
1235 | } | |
1236 | ||
1237 | static int init_subctxts(struct qib_devdata *dd, | |
1238 | struct qib_ctxtdata *rcd, | |
1239 | const struct qib_user_info *uinfo) | |
1240 | { | |
1241 | int ret = 0; | |
1242 | unsigned num_subctxts; | |
1243 | size_t size; | |
1244 | ||
1245 | /* | |
1246 | * If the user is requesting zero subctxts, | |
1247 | * skip the subctxt allocation. | |
1248 | */ | |
1249 | if (uinfo->spu_subctxt_cnt <= 0) | |
1250 | goto bail; | |
1251 | num_subctxts = uinfo->spu_subctxt_cnt; | |
1252 | ||
1253 | /* Check for subctxt compatibility */ | |
1254 | if (!qib_compatible_subctxts(uinfo->spu_userversion >> 16, | |
1255 | uinfo->spu_userversion & 0xffff)) { | |
1256 | qib_devinfo(dd->pcidev, | |
a46a2802 | 1257 | "Mismatched user version (%d.%d) and driver version (%d.%d) while context sharing. Ensure that driver and library are from the same release.\n", |
f931551b RC |
1258 | (int) (uinfo->spu_userversion >> 16), |
1259 | (int) (uinfo->spu_userversion & 0xffff), | |
1260 | QIB_USER_SWMAJOR, QIB_USER_SWMINOR); | |
1261 | goto bail; | |
1262 | } | |
1263 | if (num_subctxts > QLOGIC_IB_MAX_SUBCTXT) { | |
1264 | ret = -EINVAL; | |
1265 | goto bail; | |
1266 | } | |
1267 | ||
1268 | rcd->subctxt_uregbase = vmalloc_user(PAGE_SIZE * num_subctxts); | |
1269 | if (!rcd->subctxt_uregbase) { | |
1270 | ret = -ENOMEM; | |
1271 | goto bail; | |
1272 | } | |
1273 | /* Note: rcd->rcvhdrq_size isn't initialized yet. */ | |
1274 | size = ALIGN(dd->rcvhdrcnt * dd->rcvhdrentsize * | |
1275 | sizeof(u32), PAGE_SIZE) * num_subctxts; | |
1276 | rcd->subctxt_rcvhdr_base = vmalloc_user(size); | |
1277 | if (!rcd->subctxt_rcvhdr_base) { | |
1278 | ret = -ENOMEM; | |
1279 | goto bail_ureg; | |
1280 | } | |
1281 | ||
1282 | rcd->subctxt_rcvegrbuf = vmalloc_user(rcd->rcvegrbuf_chunks * | |
1283 | rcd->rcvegrbuf_size * | |
1284 | num_subctxts); | |
1285 | if (!rcd->subctxt_rcvegrbuf) { | |
1286 | ret = -ENOMEM; | |
1287 | goto bail_rhdr; | |
1288 | } | |
1289 | ||
1290 | rcd->subctxt_cnt = uinfo->spu_subctxt_cnt; | |
1291 | rcd->subctxt_id = uinfo->spu_subctxt_id; | |
1292 | rcd->active_slaves = 1; | |
1293 | rcd->redirect_seq_cnt = 1; | |
1294 | set_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag); | |
1295 | goto bail; | |
1296 | ||
1297 | bail_rhdr: | |
1298 | vfree(rcd->subctxt_rcvhdr_base); | |
1299 | bail_ureg: | |
1300 | vfree(rcd->subctxt_uregbase); | |
1301 | rcd->subctxt_uregbase = NULL; | |
1302 | bail: | |
1303 | return ret; | |
1304 | } | |
1305 | ||
1306 | static int setup_ctxt(struct qib_pportdata *ppd, int ctxt, | |
1307 | struct file *fp, const struct qib_user_info *uinfo) | |
1308 | { | |
c804f072 | 1309 | struct qib_filedata *fd = fp->private_data; |
f931551b RC |
1310 | struct qib_devdata *dd = ppd->dd; |
1311 | struct qib_ctxtdata *rcd; | |
1312 | void *ptmp = NULL; | |
1313 | int ret; | |
e0f30bac | 1314 | int numa_id; |
f931551b | 1315 | |
c804f072 | 1316 | assign_ctxt_affinity(fp, dd); |
f931551b | 1317 | |
c804f072 RV |
1318 | numa_id = qib_numa_aware ? ((fd->rec_cpu_num != -1) ? |
1319 | cpu_to_node(fd->rec_cpu_num) : | |
1320 | numa_node_id()) : dd->assigned_node_id; | |
e0f30bac RV |
1321 | |
1322 | rcd = qib_create_ctxtdata(ppd, ctxt, numa_id); | |
f931551b RC |
1323 | |
1324 | /* | |
1325 | * Allocate memory for use in qib_tid_update() at open to | |
1326 | * reduce cost of expected send setup per message segment | |
1327 | */ | |
1328 | if (rcd) | |
1329 | ptmp = kmalloc(dd->rcvtidcnt * sizeof(u16) + | |
1330 | dd->rcvtidcnt * sizeof(struct page **), | |
1331 | GFP_KERNEL); | |
1332 | ||
1333 | if (!rcd || !ptmp) { | |
7fac3301 MM |
1334 | qib_dev_err(dd, |
1335 | "Unable to allocate ctxtdata memory, failing open\n"); | |
f931551b RC |
1336 | ret = -ENOMEM; |
1337 | goto bailerr; | |
1338 | } | |
1339 | rcd->userversion = uinfo->spu_userversion; | |
1340 | ret = init_subctxts(dd, rcd, uinfo); | |
1341 | if (ret) | |
1342 | goto bailerr; | |
1343 | rcd->tid_pg_list = ptmp; | |
1344 | rcd->pid = current->pid; | |
1345 | init_waitqueue_head(&dd->rcd[ctxt]->wait); | |
1346 | strlcpy(rcd->comm, current->comm, sizeof(rcd->comm)); | |
1347 | ctxt_fp(fp) = rcd; | |
1348 | qib_stats.sps_ctxts++; | |
29d1b161 | 1349 | dd->freectxts--; |
f931551b RC |
1350 | ret = 0; |
1351 | goto bail; | |
1352 | ||
1353 | bailerr: | |
c804f072 RV |
1354 | if (fd->rec_cpu_num != -1) |
1355 | __clear_bit(fd->rec_cpu_num, qib_cpulist); | |
1356 | ||
f931551b RC |
1357 | dd->rcd[ctxt] = NULL; |
1358 | kfree(rcd); | |
1359 | kfree(ptmp); | |
1360 | bail: | |
1361 | return ret; | |
1362 | } | |
1363 | ||
bdf8edcb | 1364 | static inline int usable(struct qib_pportdata *ppd) |
f931551b RC |
1365 | { |
1366 | struct qib_devdata *dd = ppd->dd; | |
f931551b RC |
1367 | |
1368 | return dd && (dd->flags & QIB_PRESENT) && dd->kregbase && ppd->lid && | |
bdf8edcb | 1369 | (ppd->lflags & QIBL_LINKACTIVE); |
f931551b RC |
1370 | } |
1371 | ||
bdf8edcb DO |
1372 | /* |
1373 | * Select a context on the given device, either using a requested port | |
1374 | * or the port based on the context number. | |
1375 | */ | |
1376 | static int choose_port_ctxt(struct file *fp, struct qib_devdata *dd, u32 port, | |
1377 | const struct qib_user_info *uinfo) | |
f931551b | 1378 | { |
f931551b | 1379 | struct qib_pportdata *ppd = NULL; |
bdf8edcb | 1380 | int ret, ctxt; |
f931551b | 1381 | |
bdf8edcb DO |
1382 | if (port) { |
1383 | if (!usable(dd->pport + port - 1)) { | |
f931551b | 1384 | ret = -ENETDOWN; |
bdf8edcb DO |
1385 | goto done; |
1386 | } else | |
1387 | ppd = dd->pport + port - 1; | |
f931551b | 1388 | } |
bdf8edcb DO |
1389 | for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts && dd->rcd[ctxt]; |
1390 | ctxt++) | |
1391 | ; | |
1392 | if (ctxt == dd->cfgctxts) { | |
1393 | ret = -EBUSY; | |
1394 | goto done; | |
1395 | } | |
1396 | if (!ppd) { | |
1397 | u32 pidx = ctxt % dd->num_pports; | |
da12c1f6 | 1398 | |
bdf8edcb DO |
1399 | if (usable(dd->pport + pidx)) |
1400 | ppd = dd->pport + pidx; | |
1401 | else { | |
1402 | for (pidx = 0; pidx < dd->num_pports && !ppd; | |
1403 | pidx++) | |
1404 | if (usable(dd->pport + pidx)) | |
1405 | ppd = dd->pport + pidx; | |
f931551b | 1406 | } |
f931551b | 1407 | } |
bdf8edcb DO |
1408 | ret = ppd ? setup_ctxt(ppd, ctxt, fp, uinfo) : -ENETDOWN; |
1409 | done: | |
1410 | return ret; | |
1411 | } | |
1412 | ||
1413 | static int find_free_ctxt(int unit, struct file *fp, | |
1414 | const struct qib_user_info *uinfo) | |
1415 | { | |
1416 | struct qib_devdata *dd = qib_lookup(unit); | |
1417 | int ret; | |
1418 | ||
1419 | if (!dd || (uinfo->spu_port && uinfo->spu_port > dd->num_pports)) | |
1420 | ret = -ENODEV; | |
1421 | else | |
1422 | ret = choose_port_ctxt(fp, dd, uinfo->spu_port, uinfo); | |
f931551b | 1423 | |
f931551b RC |
1424 | return ret; |
1425 | } | |
1426 | ||
bdf8edcb DO |
1427 | static int get_a_ctxt(struct file *fp, const struct qib_user_info *uinfo, |
1428 | unsigned alg) | |
f931551b | 1429 | { |
bdf8edcb DO |
1430 | struct qib_devdata *udd = NULL; |
1431 | int ret = 0, devmax, npresent, nup, ndev, dusable = 0, i; | |
f931551b RC |
1432 | u32 port = uinfo->spu_port, ctxt; |
1433 | ||
1434 | devmax = qib_count_units(&npresent, &nup); | |
bdf8edcb DO |
1435 | if (!npresent) { |
1436 | ret = -ENXIO; | |
1437 | goto done; | |
1438 | } | |
1439 | if (nup == 0) { | |
1440 | ret = -ENETDOWN; | |
1441 | goto done; | |
1442 | } | |
f931551b | 1443 | |
bdf8edcb DO |
1444 | if (alg == QIB_PORT_ALG_ACROSS) { |
1445 | unsigned inuse = ~0U; | |
da12c1f6 | 1446 | |
bdf8edcb DO |
1447 | /* find device (with ACTIVE ports) with fewest ctxts in use */ |
1448 | for (ndev = 0; ndev < devmax; ndev++) { | |
1449 | struct qib_devdata *dd = qib_lookup(ndev); | |
6676b3f7 | 1450 | unsigned cused = 0, cfree = 0, pusable = 0; |
da12c1f6 | 1451 | |
bdf8edcb | 1452 | if (!dd) |
f931551b | 1453 | continue; |
bdf8edcb DO |
1454 | if (port && port <= dd->num_pports && |
1455 | usable(dd->pport + port - 1)) | |
6676b3f7 | 1456 | pusable = 1; |
bdf8edcb DO |
1457 | else |
1458 | for (i = 0; i < dd->num_pports; i++) | |
1459 | if (usable(dd->pport + i)) | |
6676b3f7 MM |
1460 | pusable++; |
1461 | if (!pusable) | |
bdf8edcb DO |
1462 | continue; |
1463 | for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts; | |
1464 | ctxt++) | |
1465 | if (dd->rcd[ctxt]) | |
1466 | cused++; | |
1467 | else | |
1468 | cfree++; | |
db498827 | 1469 | if (cfree && cused < inuse) { |
bdf8edcb DO |
1470 | udd = dd; |
1471 | inuse = cused; | |
f931551b | 1472 | } |
bdf8edcb DO |
1473 | } |
1474 | if (udd) { | |
1475 | ret = choose_port_ctxt(fp, udd, port, uinfo); | |
f931551b RC |
1476 | goto done; |
1477 | } | |
bdf8edcb DO |
1478 | } else { |
1479 | for (ndev = 0; ndev < devmax; ndev++) { | |
1480 | struct qib_devdata *dd = qib_lookup(ndev); | |
da12c1f6 | 1481 | |
bdf8edcb DO |
1482 | if (dd) { |
1483 | ret = choose_port_ctxt(fp, dd, port, uinfo); | |
1484 | if (!ret) | |
1485 | goto done; | |
1486 | if (ret == -EBUSY) | |
1487 | dusable++; | |
1488 | } | |
1489 | } | |
f931551b | 1490 | } |
bdf8edcb | 1491 | ret = dusable ? -EBUSY : -ENETDOWN; |
f931551b RC |
1492 | |
1493 | done: | |
1494 | return ret; | |
1495 | } | |
1496 | ||
1497 | static int find_shared_ctxt(struct file *fp, | |
1498 | const struct qib_user_info *uinfo) | |
1499 | { | |
1500 | int devmax, ndev, i; | |
1501 | int ret = 0; | |
1502 | ||
1503 | devmax = qib_count_units(NULL, NULL); | |
1504 | ||
1505 | for (ndev = 0; ndev < devmax; ndev++) { | |
1506 | struct qib_devdata *dd = qib_lookup(ndev); | |
1507 | ||
1508 | /* device portion of usable() */ | |
1509 | if (!(dd && (dd->flags & QIB_PRESENT) && dd->kregbase)) | |
1510 | continue; | |
1511 | for (i = dd->first_user_ctxt; i < dd->cfgctxts; i++) { | |
1512 | struct qib_ctxtdata *rcd = dd->rcd[i]; | |
1513 | ||
1514 | /* Skip ctxts which are not yet open */ | |
1515 | if (!rcd || !rcd->cnt) | |
1516 | continue; | |
1517 | /* Skip ctxt if it doesn't match the requested one */ | |
1518 | if (rcd->subctxt_id != uinfo->spu_subctxt_id) | |
1519 | continue; | |
1520 | /* Verify the sharing process matches the master */ | |
1521 | if (rcd->subctxt_cnt != uinfo->spu_subctxt_cnt || | |
1522 | rcd->userversion != uinfo->spu_userversion || | |
1523 | rcd->cnt >= rcd->subctxt_cnt) { | |
1524 | ret = -EINVAL; | |
1525 | goto done; | |
1526 | } | |
1527 | ctxt_fp(fp) = rcd; | |
1528 | subctxt_fp(fp) = rcd->cnt++; | |
1529 | rcd->subpid[subctxt_fp(fp)] = current->pid; | |
1530 | tidcursor_fp(fp) = 0; | |
1531 | rcd->active_slaves |= 1 << subctxt_fp(fp); | |
1532 | ret = 1; | |
1533 | goto done; | |
1534 | } | |
1535 | } | |
1536 | ||
1537 | done: | |
1538 | return ret; | |
1539 | } | |
1540 | ||
1541 | static int qib_open(struct inode *in, struct file *fp) | |
1542 | { | |
1543 | /* The real work is performed later in qib_assign_ctxt() */ | |
1544 | fp->private_data = kzalloc(sizeof(struct qib_filedata), GFP_KERNEL); | |
1545 | if (fp->private_data) /* no cpu affinity by default */ | |
1546 | ((struct qib_filedata *)fp->private_data)->rec_cpu_num = -1; | |
1547 | return fp->private_data ? 0 : -ENOMEM; | |
1548 | } | |
1549 | ||
c804f072 RV |
1550 | static int find_hca(unsigned int cpu, int *unit) |
1551 | { | |
1552 | int ret = 0, devmax, npresent, nup, ndev; | |
1553 | ||
1554 | *unit = -1; | |
1555 | ||
1556 | devmax = qib_count_units(&npresent, &nup); | |
1557 | if (!npresent) { | |
1558 | ret = -ENXIO; | |
1559 | goto done; | |
1560 | } | |
1561 | if (!nup) { | |
1562 | ret = -ENETDOWN; | |
1563 | goto done; | |
1564 | } | |
1565 | for (ndev = 0; ndev < devmax; ndev++) { | |
1566 | struct qib_devdata *dd = qib_lookup(ndev); | |
da12c1f6 | 1567 | |
c804f072 RV |
1568 | if (dd) { |
1569 | if (pcibus_to_node(dd->pcidev->bus) < 0) { | |
1570 | ret = -EINVAL; | |
1571 | goto done; | |
1572 | } | |
1573 | if (cpu_to_node(cpu) == | |
1574 | pcibus_to_node(dd->pcidev->bus)) { | |
1575 | *unit = ndev; | |
1576 | goto done; | |
1577 | } | |
1578 | } | |
1579 | } | |
1580 | done: | |
1581 | return ret; | |
1582 | } | |
1583 | ||
1584 | static int do_qib_user_sdma_queue_create(struct file *fp) | |
1585 | { | |
1586 | struct qib_filedata *fd = fp->private_data; | |
1587 | struct qib_ctxtdata *rcd = fd->rcd; | |
1588 | struct qib_devdata *dd = rcd->dd; | |
1589 | ||
37a96765 | 1590 | if (dd->flags & QIB_HAS_SEND_DMA) { |
c804f072 RV |
1591 | |
1592 | fd->pq = qib_user_sdma_queue_create(&dd->pcidev->dev, | |
1593 | dd->unit, | |
1594 | rcd->ctxt, | |
1595 | fd->subctxt); | |
1596 | if (!fd->pq) | |
1597 | return -ENOMEM; | |
37a96765 | 1598 | } |
c804f072 RV |
1599 | |
1600 | return 0; | |
1601 | } | |
1602 | ||
f931551b RC |
1603 | /* |
1604 | * Get ctxt early, so can set affinity prior to memory allocation. | |
1605 | */ | |
1606 | static int qib_assign_ctxt(struct file *fp, const struct qib_user_info *uinfo) | |
1607 | { | |
1608 | int ret; | |
1609 | int i_minor; | |
bdf8edcb | 1610 | unsigned swmajor, swminor, alg = QIB_PORT_ALG_ACROSS; |
f931551b RC |
1611 | |
1612 | /* Check to be sure we haven't already initialized this file */ | |
1613 | if (ctxt_fp(fp)) { | |
1614 | ret = -EINVAL; | |
1615 | goto done; | |
1616 | } | |
1617 | ||
1618 | /* for now, if major version is different, bail */ | |
1619 | swmajor = uinfo->spu_userversion >> 16; | |
1620 | if (swmajor != QIB_USER_SWMAJOR) { | |
1621 | ret = -ENODEV; | |
1622 | goto done; | |
1623 | } | |
1624 | ||
1625 | swminor = uinfo->spu_userversion & 0xffff; | |
1626 | ||
bdf8edcb DO |
1627 | if (swminor >= 11 && uinfo->spu_port_alg < QIB_PORT_ALG_COUNT) |
1628 | alg = uinfo->spu_port_alg; | |
1629 | ||
f931551b RC |
1630 | mutex_lock(&qib_mutex); |
1631 | ||
1632 | if (qib_compatible_subctxts(swmajor, swminor) && | |
1633 | uinfo->spu_subctxt_cnt) { | |
1634 | ret = find_shared_ctxt(fp, uinfo); | |
c804f072 RV |
1635 | if (ret > 0) { |
1636 | ret = do_qib_user_sdma_queue_create(fp); | |
1637 | if (!ret) | |
1638 | assign_ctxt_affinity(fp, (ctxt_fp(fp))->dd); | |
1639 | goto done_ok; | |
f931551b RC |
1640 | } |
1641 | } | |
1642 | ||
496ad9aa | 1643 | i_minor = iminor(file_inode(fp)) - QIB_USER_MINOR_BASE; |
f931551b RC |
1644 | if (i_minor) |
1645 | ret = find_free_ctxt(i_minor - 1, fp, uinfo); | |
c804f072 RV |
1646 | else { |
1647 | int unit; | |
1648 | const unsigned int cpu = cpumask_first(¤t->cpus_allowed); | |
1649 | const unsigned int weight = | |
1650 | cpumask_weight(¤t->cpus_allowed); | |
1651 | ||
1652 | if (weight == 1 && !test_bit(cpu, qib_cpulist)) | |
1653 | if (!find_hca(cpu, &unit) && unit >= 0) | |
1654 | if (!find_free_ctxt(unit, fp, uinfo)) { | |
1655 | ret = 0; | |
1656 | goto done_chk_sdma; | |
1657 | } | |
bdf8edcb | 1658 | ret = get_a_ctxt(fp, uinfo, alg); |
f931551b RC |
1659 | } |
1660 | ||
c804f072 RV |
1661 | done_chk_sdma: |
1662 | if (!ret) | |
1663 | ret = do_qib_user_sdma_queue_create(fp); | |
1664 | done_ok: | |
f931551b RC |
1665 | mutex_unlock(&qib_mutex); |
1666 | ||
1667 | done: | |
1668 | return ret; | |
1669 | } | |
1670 | ||
1671 | ||
1672 | static int qib_do_user_init(struct file *fp, | |
1673 | const struct qib_user_info *uinfo) | |
1674 | { | |
1675 | int ret; | |
1676 | struct qib_ctxtdata *rcd = ctxt_fp(fp); | |
1677 | struct qib_devdata *dd; | |
1678 | unsigned uctxt; | |
1679 | ||
1680 | /* Subctxts don't need to initialize anything since master did it. */ | |
1681 | if (subctxt_fp(fp)) { | |
1682 | ret = wait_event_interruptible(rcd->wait, | |
1683 | !test_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag)); | |
1684 | goto bail; | |
1685 | } | |
1686 | ||
1687 | dd = rcd->dd; | |
1688 | ||
1689 | /* some ctxts may get extra buffers, calculate that here */ | |
1690 | uctxt = rcd->ctxt - dd->first_user_ctxt; | |
1691 | if (uctxt < dd->ctxts_extrabuf) { | |
1692 | rcd->piocnt = dd->pbufsctxt + 1; | |
1693 | rcd->pio_base = rcd->piocnt * uctxt; | |
1694 | } else { | |
1695 | rcd->piocnt = dd->pbufsctxt; | |
1696 | rcd->pio_base = rcd->piocnt * uctxt + | |
1697 | dd->ctxts_extrabuf; | |
1698 | } | |
1699 | ||
1700 | /* | |
1701 | * All user buffers are 2KB buffers. If we ever support | |
1702 | * giving 4KB buffers to user processes, this will need some | |
1703 | * work. Can't use piobufbase directly, because it has | |
1704 | * both 2K and 4K buffer base values. So check and handle. | |
1705 | */ | |
1706 | if ((rcd->pio_base + rcd->piocnt) > dd->piobcnt2k) { | |
1707 | if (rcd->pio_base >= dd->piobcnt2k) { | |
1708 | qib_dev_err(dd, | |
1709 | "%u:ctxt%u: no 2KB buffers available\n", | |
1710 | dd->unit, rcd->ctxt); | |
1711 | ret = -ENOBUFS; | |
1712 | goto bail; | |
1713 | } | |
1714 | rcd->piocnt = dd->piobcnt2k - rcd->pio_base; | |
1715 | qib_dev_err(dd, "Ctxt%u: would use 4KB bufs, using %u\n", | |
1716 | rcd->ctxt, rcd->piocnt); | |
1717 | } | |
1718 | ||
1719 | rcd->piobufs = dd->pio2k_bufbase + rcd->pio_base * dd->palign; | |
1720 | qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt, | |
1721 | TXCHK_CHG_TYPE_USER, rcd); | |
1722 | /* | |
1723 | * try to ensure that processes start up with consistent avail update | |
1724 | * for their own range, at least. If system very quiet, it might | |
1725 | * have the in-memory copy out of date at startup for this range of | |
1726 | * buffers, when a context gets re-used. Do after the chg_pioavail | |
1727 | * and before the rest of setup, so it's "almost certain" the dma | |
1728 | * will have occurred (can't 100% guarantee, but should be many | |
1729 | * decimals of 9s, with this ordering), given how much else happens | |
1730 | * after this. | |
1731 | */ | |
1732 | dd->f_sendctrl(dd->pport, QIB_SENDCTRL_AVAIL_BLIP); | |
1733 | ||
1734 | /* | |
1735 | * Now allocate the rcvhdr Q and eager TIDs; skip the TID | |
1736 | * array for time being. If rcd->ctxt > chip-supported, | |
1737 | * we need to do extra stuff here to handle by handling overflow | |
1738 | * through ctxt 0, someday | |
1739 | */ | |
1740 | ret = qib_create_rcvhdrq(dd, rcd); | |
1741 | if (!ret) | |
1742 | ret = qib_setup_eagerbufs(rcd); | |
1743 | if (ret) | |
1744 | goto bail_pio; | |
1745 | ||
1746 | rcd->tidcursor = 0; /* start at beginning after open */ | |
1747 | ||
1748 | /* initialize poll variables... */ | |
1749 | rcd->urgent = 0; | |
1750 | rcd->urgent_poll = 0; | |
1751 | ||
1752 | /* | |
1753 | * Now enable the ctxt for receive. | |
1754 | * For chips that are set to DMA the tail register to memory | |
1755 | * when they change (and when the update bit transitions from | |
1756 | * 0 to 1. So for those chips, we turn it off and then back on. | |
1757 | * This will (very briefly) affect any other open ctxts, but the | |
1758 | * duration is very short, and therefore isn't an issue. We | |
25985edc | 1759 | * explicitly set the in-memory tail copy to 0 beforehand, so we |
f931551b RC |
1760 | * don't have to wait to be sure the DMA update has happened |
1761 | * (chip resets head/tail to 0 on transition to enable). | |
1762 | */ | |
1763 | if (rcd->rcvhdrtail_kvaddr) | |
1764 | qib_clear_rcvhdrtail(rcd); | |
1765 | ||
1766 | dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_ENB | QIB_RCVCTRL_TIDFLOW_ENB, | |
1767 | rcd->ctxt); | |
1768 | ||
1769 | /* Notify any waiting slaves */ | |
1770 | if (rcd->subctxt_cnt) { | |
1771 | clear_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag); | |
1772 | wake_up(&rcd->wait); | |
1773 | } | |
1774 | return 0; | |
1775 | ||
1776 | bail_pio: | |
1777 | qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt, | |
1778 | TXCHK_CHG_TYPE_KERN, rcd); | |
1779 | bail: | |
1780 | return ret; | |
1781 | } | |
1782 | ||
1783 | /** | |
1784 | * unlock_exptid - unlock any expected TID entries context still had in use | |
1785 | * @rcd: ctxt | |
1786 | * | |
1787 | * We don't actually update the chip here, because we do a bulk update | |
1788 | * below, using f_clear_tids. | |
1789 | */ | |
1790 | static void unlock_expected_tids(struct qib_ctxtdata *rcd) | |
1791 | { | |
1792 | struct qib_devdata *dd = rcd->dd; | |
1793 | int ctxt_tidbase = rcd->ctxt * dd->rcvtidcnt; | |
1794 | int i, cnt = 0, maxtid = ctxt_tidbase + dd->rcvtidcnt; | |
1795 | ||
1796 | for (i = ctxt_tidbase; i < maxtid; i++) { | |
1797 | struct page *p = dd->pageshadow[i]; | |
1798 | dma_addr_t phys; | |
1799 | ||
1800 | if (!p) | |
1801 | continue; | |
1802 | ||
1803 | phys = dd->physshadow[i]; | |
1804 | dd->physshadow[i] = dd->tidinvalid; | |
1805 | dd->pageshadow[i] = NULL; | |
1806 | pci_unmap_page(dd->pcidev, phys, PAGE_SIZE, | |
1807 | PCI_DMA_FROMDEVICE); | |
1808 | qib_release_user_pages(&p, 1); | |
1809 | cnt++; | |
1810 | } | |
1811 | } | |
1812 | ||
1813 | static int qib_close(struct inode *in, struct file *fp) | |
1814 | { | |
1815 | int ret = 0; | |
1816 | struct qib_filedata *fd; | |
1817 | struct qib_ctxtdata *rcd; | |
1818 | struct qib_devdata *dd; | |
1819 | unsigned long flags; | |
1820 | unsigned ctxt; | |
1821 | pid_t pid; | |
1822 | ||
1823 | mutex_lock(&qib_mutex); | |
1824 | ||
ea3f0e6b | 1825 | fd = fp->private_data; |
f931551b RC |
1826 | fp->private_data = NULL; |
1827 | rcd = fd->rcd; | |
1828 | if (!rcd) { | |
1829 | mutex_unlock(&qib_mutex); | |
1830 | goto bail; | |
1831 | } | |
1832 | ||
1833 | dd = rcd->dd; | |
1834 | ||
1835 | /* ensure all pio buffer writes in progress are flushed */ | |
1836 | qib_flush_wc(); | |
1837 | ||
1838 | /* drain user sdma queue */ | |
1839 | if (fd->pq) { | |
1840 | qib_user_sdma_queue_drain(rcd->ppd, fd->pq); | |
1841 | qib_user_sdma_queue_destroy(fd->pq); | |
1842 | } | |
1843 | ||
1844 | if (fd->rec_cpu_num != -1) | |
1845 | __clear_bit(fd->rec_cpu_num, qib_cpulist); | |
1846 | ||
1847 | if (--rcd->cnt) { | |
1848 | /* | |
1849 | * XXX If the master closes the context before the slave(s), | |
1850 | * revoke the mmap for the eager receive queue so | |
1851 | * the slave(s) don't wait for receive data forever. | |
1852 | */ | |
1853 | rcd->active_slaves &= ~(1 << fd->subctxt); | |
1854 | rcd->subpid[fd->subctxt] = 0; | |
1855 | mutex_unlock(&qib_mutex); | |
1856 | goto bail; | |
1857 | } | |
1858 | ||
1859 | /* early; no interrupt users after this */ | |
1860 | spin_lock_irqsave(&dd->uctxt_lock, flags); | |
1861 | ctxt = rcd->ctxt; | |
1862 | dd->rcd[ctxt] = NULL; | |
1863 | pid = rcd->pid; | |
1864 | rcd->pid = 0; | |
1865 | spin_unlock_irqrestore(&dd->uctxt_lock, flags); | |
1866 | ||
1867 | if (rcd->rcvwait_to || rcd->piowait_to || | |
1868 | rcd->rcvnowait || rcd->pionowait) { | |
1869 | rcd->rcvwait_to = 0; | |
1870 | rcd->piowait_to = 0; | |
1871 | rcd->rcvnowait = 0; | |
1872 | rcd->pionowait = 0; | |
1873 | } | |
1874 | if (rcd->flag) | |
1875 | rcd->flag = 0; | |
1876 | ||
1877 | if (dd->kregbase) { | |
1878 | /* atomically clear receive enable ctxt and intr avail. */ | |
1879 | dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_DIS | | |
1880 | QIB_RCVCTRL_INTRAVAIL_DIS, ctxt); | |
1881 | ||
1882 | /* clean up the pkeys for this ctxt user */ | |
1883 | qib_clean_part_key(rcd, dd); | |
1884 | qib_disarm_piobufs(dd, rcd->pio_base, rcd->piocnt); | |
1885 | qib_chg_pioavailkernel(dd, rcd->pio_base, | |
1886 | rcd->piocnt, TXCHK_CHG_TYPE_KERN, NULL); | |
1887 | ||
1888 | dd->f_clear_tids(dd, rcd); | |
1889 | ||
1890 | if (dd->pageshadow) | |
1891 | unlock_expected_tids(rcd); | |
1892 | qib_stats.sps_ctxts--; | |
29d1b161 | 1893 | dd->freectxts++; |
f931551b RC |
1894 | } |
1895 | ||
1896 | mutex_unlock(&qib_mutex); | |
1897 | qib_free_ctxtdata(dd, rcd); /* after releasing the mutex */ | |
1898 | ||
1899 | bail: | |
1900 | kfree(fd); | |
1901 | return ret; | |
1902 | } | |
1903 | ||
1904 | static int qib_ctxt_info(struct file *fp, struct qib_ctxt_info __user *uinfo) | |
1905 | { | |
1906 | struct qib_ctxt_info info; | |
1907 | int ret; | |
1908 | size_t sz; | |
1909 | struct qib_ctxtdata *rcd = ctxt_fp(fp); | |
1910 | struct qib_filedata *fd; | |
1911 | ||
ea3f0e6b | 1912 | fd = fp->private_data; |
f931551b RC |
1913 | |
1914 | info.num_active = qib_count_active_units(); | |
1915 | info.unit = rcd->dd->unit; | |
1916 | info.port = rcd->ppd->port; | |
1917 | info.ctxt = rcd->ctxt; | |
1918 | info.subctxt = subctxt_fp(fp); | |
1919 | /* Number of user ctxts available for this device. */ | |
1920 | info.num_ctxts = rcd->dd->cfgctxts - rcd->dd->first_user_ctxt; | |
1921 | info.num_subctxts = rcd->subctxt_cnt; | |
1922 | info.rec_cpu = fd->rec_cpu_num; | |
1923 | sz = sizeof(info); | |
1924 | ||
1925 | if (copy_to_user(uinfo, &info, sz)) { | |
1926 | ret = -EFAULT; | |
1927 | goto bail; | |
1928 | } | |
1929 | ret = 0; | |
1930 | ||
1931 | bail: | |
1932 | return ret; | |
1933 | } | |
1934 | ||
1935 | static int qib_sdma_get_inflight(struct qib_user_sdma_queue *pq, | |
1936 | u32 __user *inflightp) | |
1937 | { | |
1938 | const u32 val = qib_user_sdma_inflight_counter(pq); | |
1939 | ||
1940 | if (put_user(val, inflightp)) | |
1941 | return -EFAULT; | |
1942 | ||
1943 | return 0; | |
1944 | } | |
1945 | ||
1946 | static int qib_sdma_get_complete(struct qib_pportdata *ppd, | |
1947 | struct qib_user_sdma_queue *pq, | |
1948 | u32 __user *completep) | |
1949 | { | |
1950 | u32 val; | |
1951 | int err; | |
1952 | ||
1953 | if (!pq) | |
1954 | return -EINVAL; | |
1955 | ||
1956 | err = qib_user_sdma_make_progress(ppd, pq); | |
1957 | if (err < 0) | |
1958 | return err; | |
1959 | ||
1960 | val = qib_user_sdma_complete_counter(pq); | |
1961 | if (put_user(val, completep)) | |
1962 | return -EFAULT; | |
1963 | ||
1964 | return 0; | |
1965 | } | |
1966 | ||
1967 | static int disarm_req_delay(struct qib_ctxtdata *rcd) | |
1968 | { | |
1969 | int ret = 0; | |
1970 | ||
bdf8edcb | 1971 | if (!usable(rcd->ppd)) { |
f931551b RC |
1972 | int i; |
1973 | /* | |
1974 | * if link is down, or otherwise not usable, delay | |
1975 | * the caller up to 30 seconds, so we don't thrash | |
1976 | * in trying to get the chip back to ACTIVE, and | |
1977 | * set flag so they make the call again. | |
1978 | */ | |
1979 | if (rcd->user_event_mask) { | |
1980 | /* | |
1981 | * subctxt_cnt is 0 if not shared, so do base | |
1982 | * separately, first, then remaining subctxt, if any | |
1983 | */ | |
1984 | set_bit(_QIB_EVENT_DISARM_BUFS_BIT, | |
1985 | &rcd->user_event_mask[0]); | |
1986 | for (i = 1; i < rcd->subctxt_cnt; i++) | |
1987 | set_bit(_QIB_EVENT_DISARM_BUFS_BIT, | |
1988 | &rcd->user_event_mask[i]); | |
1989 | } | |
bdf8edcb | 1990 | for (i = 0; !usable(rcd->ppd) && i < 300; i++) |
f931551b RC |
1991 | msleep(100); |
1992 | ret = -ENETDOWN; | |
1993 | } | |
1994 | return ret; | |
1995 | } | |
1996 | ||
1997 | /* | |
1998 | * Find all user contexts in use, and set the specified bit in their | |
1999 | * event mask. | |
2000 | * See also find_ctxt() for a similar use, that is specific to send buffers. | |
2001 | */ | |
2002 | int qib_set_uevent_bits(struct qib_pportdata *ppd, const int evtbit) | |
2003 | { | |
2004 | struct qib_ctxtdata *rcd; | |
2005 | unsigned ctxt; | |
2006 | int ret = 0; | |
4356d0b6 | 2007 | unsigned long flags; |
f931551b | 2008 | |
4356d0b6 | 2009 | spin_lock_irqsave(&ppd->dd->uctxt_lock, flags); |
f931551b RC |
2010 | for (ctxt = ppd->dd->first_user_ctxt; ctxt < ppd->dd->cfgctxts; |
2011 | ctxt++) { | |
2012 | rcd = ppd->dd->rcd[ctxt]; | |
2013 | if (!rcd) | |
2014 | continue; | |
2015 | if (rcd->user_event_mask) { | |
2016 | int i; | |
2017 | /* | |
2018 | * subctxt_cnt is 0 if not shared, so do base | |
2019 | * separately, first, then remaining subctxt, if any | |
2020 | */ | |
2021 | set_bit(evtbit, &rcd->user_event_mask[0]); | |
2022 | for (i = 1; i < rcd->subctxt_cnt; i++) | |
2023 | set_bit(evtbit, &rcd->user_event_mask[i]); | |
2024 | } | |
2025 | ret = 1; | |
2026 | break; | |
2027 | } | |
4356d0b6 | 2028 | spin_unlock_irqrestore(&ppd->dd->uctxt_lock, flags); |
f931551b RC |
2029 | |
2030 | return ret; | |
2031 | } | |
2032 | ||
2033 | /* | |
2034 | * clear the event notifier events for this context. | |
2035 | * For the DISARM_BUFS case, we also take action (this obsoletes | |
2036 | * the older QIB_CMD_DISARM_BUFS, but we keep it for backwards | |
2037 | * compatibility. | |
2038 | * Other bits don't currently require actions, just atomically clear. | |
2039 | * User process then performs actions appropriate to bit having been | |
2040 | * set, if desired, and checks again in future. | |
2041 | */ | |
2042 | static int qib_user_event_ack(struct qib_ctxtdata *rcd, int subctxt, | |
2043 | unsigned long events) | |
2044 | { | |
2045 | int ret = 0, i; | |
2046 | ||
2047 | for (i = 0; i <= _QIB_MAX_EVENT_BIT; i++) { | |
2048 | if (!test_bit(i, &events)) | |
2049 | continue; | |
2050 | if (i == _QIB_EVENT_DISARM_BUFS_BIT) { | |
2051 | (void)qib_disarm_piobufs_ifneeded(rcd); | |
2052 | ret = disarm_req_delay(rcd); | |
2053 | } else | |
2054 | clear_bit(i, &rcd->user_event_mask[subctxt]); | |
2055 | } | |
2056 | return ret; | |
2057 | } | |
2058 | ||
2059 | static ssize_t qib_write(struct file *fp, const char __user *data, | |
2060 | size_t count, loff_t *off) | |
2061 | { | |
2062 | const struct qib_cmd __user *ucmd; | |
2063 | struct qib_ctxtdata *rcd; | |
2064 | const void __user *src; | |
2065 | size_t consumed, copy = 0; | |
2066 | struct qib_cmd cmd; | |
2067 | ssize_t ret = 0; | |
2068 | void *dest; | |
2069 | ||
2070 | if (count < sizeof(cmd.type)) { | |
2071 | ret = -EINVAL; | |
2072 | goto bail; | |
2073 | } | |
2074 | ||
2075 | ucmd = (const struct qib_cmd __user *) data; | |
2076 | ||
2077 | if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) { | |
2078 | ret = -EFAULT; | |
2079 | goto bail; | |
2080 | } | |
2081 | ||
2082 | consumed = sizeof(cmd.type); | |
2083 | ||
2084 | switch (cmd.type) { | |
2085 | case QIB_CMD_ASSIGN_CTXT: | |
2086 | case QIB_CMD_USER_INIT: | |
2087 | copy = sizeof(cmd.cmd.user_info); | |
2088 | dest = &cmd.cmd.user_info; | |
2089 | src = &ucmd->cmd.user_info; | |
2090 | break; | |
2091 | ||
2092 | case QIB_CMD_RECV_CTRL: | |
2093 | copy = sizeof(cmd.cmd.recv_ctrl); | |
2094 | dest = &cmd.cmd.recv_ctrl; | |
2095 | src = &ucmd->cmd.recv_ctrl; | |
2096 | break; | |
2097 | ||
2098 | case QIB_CMD_CTXT_INFO: | |
2099 | copy = sizeof(cmd.cmd.ctxt_info); | |
2100 | dest = &cmd.cmd.ctxt_info; | |
2101 | src = &ucmd->cmd.ctxt_info; | |
2102 | break; | |
2103 | ||
2104 | case QIB_CMD_TID_UPDATE: | |
2105 | case QIB_CMD_TID_FREE: | |
2106 | copy = sizeof(cmd.cmd.tid_info); | |
2107 | dest = &cmd.cmd.tid_info; | |
2108 | src = &ucmd->cmd.tid_info; | |
2109 | break; | |
2110 | ||
2111 | case QIB_CMD_SET_PART_KEY: | |
2112 | copy = sizeof(cmd.cmd.part_key); | |
2113 | dest = &cmd.cmd.part_key; | |
2114 | src = &ucmd->cmd.part_key; | |
2115 | break; | |
2116 | ||
2117 | case QIB_CMD_DISARM_BUFS: | |
2118 | case QIB_CMD_PIOAVAILUPD: /* force an update of PIOAvail reg */ | |
2119 | copy = 0; | |
2120 | src = NULL; | |
2121 | dest = NULL; | |
2122 | break; | |
2123 | ||
2124 | case QIB_CMD_POLL_TYPE: | |
2125 | copy = sizeof(cmd.cmd.poll_type); | |
2126 | dest = &cmd.cmd.poll_type; | |
2127 | src = &ucmd->cmd.poll_type; | |
2128 | break; | |
2129 | ||
2130 | case QIB_CMD_ARMLAUNCH_CTRL: | |
2131 | copy = sizeof(cmd.cmd.armlaunch_ctrl); | |
2132 | dest = &cmd.cmd.armlaunch_ctrl; | |
2133 | src = &ucmd->cmd.armlaunch_ctrl; | |
2134 | break; | |
2135 | ||
2136 | case QIB_CMD_SDMA_INFLIGHT: | |
2137 | copy = sizeof(cmd.cmd.sdma_inflight); | |
2138 | dest = &cmd.cmd.sdma_inflight; | |
2139 | src = &ucmd->cmd.sdma_inflight; | |
2140 | break; | |
2141 | ||
2142 | case QIB_CMD_SDMA_COMPLETE: | |
2143 | copy = sizeof(cmd.cmd.sdma_complete); | |
2144 | dest = &cmd.cmd.sdma_complete; | |
2145 | src = &ucmd->cmd.sdma_complete; | |
2146 | break; | |
2147 | ||
2148 | case QIB_CMD_ACK_EVENT: | |
2149 | copy = sizeof(cmd.cmd.event_mask); | |
2150 | dest = &cmd.cmd.event_mask; | |
2151 | src = &ucmd->cmd.event_mask; | |
2152 | break; | |
2153 | ||
2154 | default: | |
2155 | ret = -EINVAL; | |
2156 | goto bail; | |
2157 | } | |
2158 | ||
2159 | if (copy) { | |
2160 | if ((count - consumed) < copy) { | |
2161 | ret = -EINVAL; | |
2162 | goto bail; | |
2163 | } | |
2164 | if (copy_from_user(dest, src, copy)) { | |
2165 | ret = -EFAULT; | |
2166 | goto bail; | |
2167 | } | |
2168 | consumed += copy; | |
2169 | } | |
2170 | ||
2171 | rcd = ctxt_fp(fp); | |
2172 | if (!rcd && cmd.type != QIB_CMD_ASSIGN_CTXT) { | |
2173 | ret = -EINVAL; | |
2174 | goto bail; | |
2175 | } | |
2176 | ||
2177 | switch (cmd.type) { | |
2178 | case QIB_CMD_ASSIGN_CTXT: | |
2179 | ret = qib_assign_ctxt(fp, &cmd.cmd.user_info); | |
2180 | if (ret) | |
2181 | goto bail; | |
2182 | break; | |
2183 | ||
2184 | case QIB_CMD_USER_INIT: | |
2185 | ret = qib_do_user_init(fp, &cmd.cmd.user_info); | |
2186 | if (ret) | |
2187 | goto bail; | |
2188 | ret = qib_get_base_info(fp, (void __user *) (unsigned long) | |
2189 | cmd.cmd.user_info.spu_base_info, | |
2190 | cmd.cmd.user_info.spu_base_info_size); | |
2191 | break; | |
2192 | ||
2193 | case QIB_CMD_RECV_CTRL: | |
2194 | ret = qib_manage_rcvq(rcd, subctxt_fp(fp), cmd.cmd.recv_ctrl); | |
2195 | break; | |
2196 | ||
2197 | case QIB_CMD_CTXT_INFO: | |
2198 | ret = qib_ctxt_info(fp, (struct qib_ctxt_info __user *) | |
2199 | (unsigned long) cmd.cmd.ctxt_info); | |
2200 | break; | |
2201 | ||
2202 | case QIB_CMD_TID_UPDATE: | |
2203 | ret = qib_tid_update(rcd, fp, &cmd.cmd.tid_info); | |
2204 | break; | |
2205 | ||
2206 | case QIB_CMD_TID_FREE: | |
2207 | ret = qib_tid_free(rcd, subctxt_fp(fp), &cmd.cmd.tid_info); | |
2208 | break; | |
2209 | ||
2210 | case QIB_CMD_SET_PART_KEY: | |
2211 | ret = qib_set_part_key(rcd, cmd.cmd.part_key); | |
2212 | break; | |
2213 | ||
2214 | case QIB_CMD_DISARM_BUFS: | |
2215 | (void)qib_disarm_piobufs_ifneeded(rcd); | |
2216 | ret = disarm_req_delay(rcd); | |
2217 | break; | |
2218 | ||
2219 | case QIB_CMD_PIOAVAILUPD: | |
2220 | qib_force_pio_avail_update(rcd->dd); | |
2221 | break; | |
2222 | ||
2223 | case QIB_CMD_POLL_TYPE: | |
2224 | rcd->poll_type = cmd.cmd.poll_type; | |
2225 | break; | |
2226 | ||
2227 | case QIB_CMD_ARMLAUNCH_CTRL: | |
2228 | rcd->dd->f_set_armlaunch(rcd->dd, cmd.cmd.armlaunch_ctrl); | |
2229 | break; | |
2230 | ||
2231 | case QIB_CMD_SDMA_INFLIGHT: | |
2232 | ret = qib_sdma_get_inflight(user_sdma_queue_fp(fp), | |
2233 | (u32 __user *) (unsigned long) | |
2234 | cmd.cmd.sdma_inflight); | |
2235 | break; | |
2236 | ||
2237 | case QIB_CMD_SDMA_COMPLETE: | |
2238 | ret = qib_sdma_get_complete(rcd->ppd, | |
2239 | user_sdma_queue_fp(fp), | |
2240 | (u32 __user *) (unsigned long) | |
2241 | cmd.cmd.sdma_complete); | |
2242 | break; | |
2243 | ||
2244 | case QIB_CMD_ACK_EVENT: | |
2245 | ret = qib_user_event_ack(rcd, subctxt_fp(fp), | |
2246 | cmd.cmd.event_mask); | |
2247 | break; | |
2248 | } | |
2249 | ||
2250 | if (ret >= 0) | |
2251 | ret = consumed; | |
2252 | ||
2253 | bail: | |
2254 | return ret; | |
2255 | } | |
2256 | ||
49617725 | 2257 | static ssize_t qib_write_iter(struct kiocb *iocb, struct iov_iter *from) |
f931551b RC |
2258 | { |
2259 | struct qib_filedata *fp = iocb->ki_filp->private_data; | |
2260 | struct qib_ctxtdata *rcd = ctxt_fp(iocb->ki_filp); | |
2261 | struct qib_user_sdma_queue *pq = fp->pq; | |
2262 | ||
49617725 | 2263 | if (!iter_is_iovec(from) || !from->nr_segs || !pq) |
f931551b | 2264 | return -EINVAL; |
49617725 AV |
2265 | |
2266 | return qib_user_sdma_writev(rcd, pq, from->iov, from->nr_segs); | |
f931551b RC |
2267 | } |
2268 | ||
2269 | static struct class *qib_class; | |
2270 | static dev_t qib_dev; | |
2271 | ||
2272 | int qib_cdev_init(int minor, const char *name, | |
2273 | const struct file_operations *fops, | |
2274 | struct cdev **cdevp, struct device **devp) | |
2275 | { | |
2276 | const dev_t dev = MKDEV(MAJOR(qib_dev), minor); | |
2277 | struct cdev *cdev; | |
2278 | struct device *device = NULL; | |
2279 | int ret; | |
2280 | ||
2281 | cdev = cdev_alloc(); | |
2282 | if (!cdev) { | |
7fac3301 | 2283 | pr_err("Could not allocate cdev for minor %d, %s\n", |
f931551b RC |
2284 | minor, name); |
2285 | ret = -ENOMEM; | |
2286 | goto done; | |
2287 | } | |
2288 | ||
2289 | cdev->owner = THIS_MODULE; | |
2290 | cdev->ops = fops; | |
2291 | kobject_set_name(&cdev->kobj, name); | |
2292 | ||
2293 | ret = cdev_add(cdev, dev, 1); | |
2294 | if (ret < 0) { | |
7fac3301 | 2295 | pr_err("Could not add cdev for minor %d, %s (err %d)\n", |
f931551b RC |
2296 | minor, name, -ret); |
2297 | goto err_cdev; | |
2298 | } | |
2299 | ||
02aa2a37 | 2300 | device = device_create(qib_class, NULL, dev, NULL, "%s", name); |
f931551b RC |
2301 | if (!IS_ERR(device)) |
2302 | goto done; | |
2303 | ret = PTR_ERR(device); | |
2304 | device = NULL; | |
7fac3301 | 2305 | pr_err("Could not create device for minor %d, %s (err %d)\n", |
f931551b RC |
2306 | minor, name, -ret); |
2307 | err_cdev: | |
2308 | cdev_del(cdev); | |
2309 | cdev = NULL; | |
2310 | done: | |
2311 | *cdevp = cdev; | |
2312 | *devp = device; | |
2313 | return ret; | |
2314 | } | |
2315 | ||
2316 | void qib_cdev_cleanup(struct cdev **cdevp, struct device **devp) | |
2317 | { | |
2318 | struct device *device = *devp; | |
2319 | ||
2320 | if (device) { | |
2321 | device_unregister(device); | |
2322 | *devp = NULL; | |
2323 | } | |
2324 | ||
2325 | if (*cdevp) { | |
2326 | cdev_del(*cdevp); | |
2327 | *cdevp = NULL; | |
2328 | } | |
2329 | } | |
2330 | ||
2331 | static struct cdev *wildcard_cdev; | |
2332 | static struct device *wildcard_device; | |
2333 | ||
2334 | int __init qib_dev_init(void) | |
2335 | { | |
2336 | int ret; | |
2337 | ||
2338 | ret = alloc_chrdev_region(&qib_dev, 0, QIB_NMINORS, QIB_DRV_NAME); | |
2339 | if (ret < 0) { | |
7fac3301 | 2340 | pr_err("Could not allocate chrdev region (err %d)\n", -ret); |
f931551b RC |
2341 | goto done; |
2342 | } | |
2343 | ||
2344 | qib_class = class_create(THIS_MODULE, "ipath"); | |
2345 | if (IS_ERR(qib_class)) { | |
2346 | ret = PTR_ERR(qib_class); | |
7fac3301 | 2347 | pr_err("Could not create device class (err %d)\n", -ret); |
f931551b RC |
2348 | unregister_chrdev_region(qib_dev, QIB_NMINORS); |
2349 | } | |
2350 | ||
2351 | done: | |
2352 | return ret; | |
2353 | } | |
2354 | ||
2355 | void qib_dev_cleanup(void) | |
2356 | { | |
2357 | if (qib_class) { | |
2358 | class_destroy(qib_class); | |
2359 | qib_class = NULL; | |
2360 | } | |
2361 | ||
2362 | unregister_chrdev_region(qib_dev, QIB_NMINORS); | |
2363 | } | |
2364 | ||
2365 | static atomic_t user_count = ATOMIC_INIT(0); | |
2366 | ||
2367 | static void qib_user_remove(struct qib_devdata *dd) | |
2368 | { | |
2369 | if (atomic_dec_return(&user_count) == 0) | |
2370 | qib_cdev_cleanup(&wildcard_cdev, &wildcard_device); | |
2371 | ||
2372 | qib_cdev_cleanup(&dd->user_cdev, &dd->user_device); | |
2373 | } | |
2374 | ||
2375 | static int qib_user_add(struct qib_devdata *dd) | |
2376 | { | |
2377 | char name[10]; | |
2378 | int ret; | |
2379 | ||
2380 | if (atomic_inc_return(&user_count) == 1) { | |
2381 | ret = qib_cdev_init(0, "ipath", &qib_file_ops, | |
2382 | &wildcard_cdev, &wildcard_device); | |
2383 | if (ret) | |
2384 | goto done; | |
2385 | } | |
2386 | ||
2387 | snprintf(name, sizeof(name), "ipath%d", dd->unit); | |
2388 | ret = qib_cdev_init(dd->unit + 1, name, &qib_file_ops, | |
2389 | &dd->user_cdev, &dd->user_device); | |
2390 | if (ret) | |
2391 | qib_user_remove(dd); | |
2392 | done: | |
2393 | return ret; | |
2394 | } | |
2395 | ||
2396 | /* | |
2397 | * Create per-unit files in /dev | |
2398 | */ | |
2399 | int qib_device_create(struct qib_devdata *dd) | |
2400 | { | |
2401 | int r, ret; | |
2402 | ||
2403 | r = qib_user_add(dd); | |
2404 | ret = qib_diag_add(dd); | |
2405 | if (r && !ret) | |
2406 | ret = r; | |
2407 | return ret; | |
2408 | } | |
2409 | ||
2410 | /* | |
2411 | * Remove per-unit files in /dev | |
2412 | * void, core kernel returns no errors for this stuff | |
2413 | */ | |
2414 | void qib_device_remove(struct qib_devdata *dd) | |
2415 | { | |
2416 | qib_user_remove(dd); | |
2417 | qib_diag_remove(dd); | |
2418 | } |