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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 | 47 | |
e6bd18f5 JG |
48 | #include <rdma/ib.h> |
49 | ||
f931551b RC |
50 | #include "qib.h" |
51 | #include "qib_common.h" | |
52 | #include "qib_user_sdma.h" | |
53 | ||
7fac3301 MM |
54 | #undef pr_fmt |
55 | #define pr_fmt(fmt) QIB_DRV_NAME ": " fmt | |
56 | ||
f931551b RC |
57 | static int qib_open(struct inode *, struct file *); |
58 | static int qib_close(struct inode *, struct file *); | |
59 | static ssize_t qib_write(struct file *, const char __user *, size_t, loff_t *); | |
49617725 | 60 | static ssize_t qib_write_iter(struct kiocb *, struct iov_iter *); |
f931551b RC |
61 | static unsigned int qib_poll(struct file *, struct poll_table_struct *); |
62 | static int qib_mmapf(struct file *, struct vm_area_struct *); | |
63 | ||
49617725 AV |
64 | /* |
65 | * This is really, really weird shit - write() and writev() here | |
66 | * have completely unrelated semantics. Sucky userland ABI, | |
67 | * film at 11. | |
68 | */ | |
f931551b RC |
69 | static const struct file_operations qib_file_ops = { |
70 | .owner = THIS_MODULE, | |
71 | .write = qib_write, | |
49617725 | 72 | .write_iter = qib_write_iter, |
f931551b RC |
73 | .open = qib_open, |
74 | .release = qib_close, | |
75 | .poll = qib_poll, | |
6038f373 AB |
76 | .mmap = qib_mmapf, |
77 | .llseek = noop_llseek, | |
f931551b RC |
78 | }; |
79 | ||
80 | /* | |
81 | * Convert kernel virtual addresses to physical addresses so they don't | |
82 | * potentially conflict with the chip addresses used as mmap offsets. | |
83 | * It doesn't really matter what mmap offset we use as long as we can | |
84 | * interpret it correctly. | |
85 | */ | |
86 | static u64 cvt_kvaddr(void *p) | |
87 | { | |
88 | struct page *page; | |
89 | u64 paddr = 0; | |
90 | ||
91 | page = vmalloc_to_page(p); | |
92 | if (page) | |
93 | paddr = page_to_pfn(page) << PAGE_SHIFT; | |
94 | ||
95 | return paddr; | |
96 | } | |
97 | ||
98 | static int qib_get_base_info(struct file *fp, void __user *ubase, | |
99 | size_t ubase_size) | |
100 | { | |
101 | struct qib_ctxtdata *rcd = ctxt_fp(fp); | |
102 | int ret = 0; | |
103 | struct qib_base_info *kinfo = NULL; | |
104 | struct qib_devdata *dd = rcd->dd; | |
105 | struct qib_pportdata *ppd = rcd->ppd; | |
106 | unsigned subctxt_cnt; | |
107 | int shared, master; | |
108 | size_t sz; | |
109 | ||
110 | subctxt_cnt = rcd->subctxt_cnt; | |
111 | if (!subctxt_cnt) { | |
112 | shared = 0; | |
113 | master = 0; | |
114 | subctxt_cnt = 1; | |
115 | } else { | |
116 | shared = 1; | |
117 | master = !subctxt_fp(fp); | |
118 | } | |
119 | ||
120 | sz = sizeof(*kinfo); | |
121 | /* If context sharing is not requested, allow the old size structure */ | |
122 | if (!shared) | |
123 | sz -= 7 * sizeof(u64); | |
124 | if (ubase_size < sz) { | |
125 | ret = -EINVAL; | |
126 | goto bail; | |
127 | } | |
128 | ||
129 | kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL); | |
130 | if (kinfo == NULL) { | |
131 | ret = -ENOMEM; | |
132 | goto bail; | |
133 | } | |
134 | ||
135 | ret = dd->f_get_base_info(rcd, kinfo); | |
136 | if (ret < 0) | |
137 | goto bail; | |
138 | ||
139 | kinfo->spi_rcvhdr_cnt = dd->rcvhdrcnt; | |
140 | kinfo->spi_rcvhdrent_size = dd->rcvhdrentsize; | |
141 | kinfo->spi_tidegrcnt = rcd->rcvegrcnt; | |
142 | kinfo->spi_rcv_egrbufsize = dd->rcvegrbufsize; | |
143 | /* | |
144 | * have to mmap whole thing | |
145 | */ | |
146 | kinfo->spi_rcv_egrbuftotlen = | |
147 | rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size; | |
148 | kinfo->spi_rcv_egrperchunk = rcd->rcvegrbufs_perchunk; | |
149 | kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen / | |
150 | rcd->rcvegrbuf_chunks; | |
151 | kinfo->spi_tidcnt = dd->rcvtidcnt / subctxt_cnt; | |
152 | if (master) | |
153 | kinfo->spi_tidcnt += dd->rcvtidcnt % subctxt_cnt; | |
154 | /* | |
155 | * for this use, may be cfgctxts summed over all chips that | |
156 | * are are configured and present | |
157 | */ | |
158 | kinfo->spi_nctxts = dd->cfgctxts; | |
159 | /* unit (chip/board) our context is on */ | |
160 | kinfo->spi_unit = dd->unit; | |
161 | kinfo->spi_port = ppd->port; | |
162 | /* for now, only a single page */ | |
163 | kinfo->spi_tid_maxsize = PAGE_SIZE; | |
164 | ||
165 | /* | |
166 | * Doing this per context, and based on the skip value, etc. This has | |
167 | * to be the actual buffer size, since the protocol code treats it | |
168 | * as an array. | |
169 | * | |
170 | * These have to be set to user addresses in the user code via mmap. | |
171 | * These values are used on return to user code for the mmap target | |
172 | * addresses only. For 32 bit, same 44 bit address problem, so use | |
173 | * the physical address, not virtual. Before 2.6.11, using the | |
174 | * page_address() macro worked, but in 2.6.11, even that returns the | |
175 | * full 64 bit address (upper bits all 1's). So far, using the | |
176 | * physical addresses (or chip offsets, for chip mapping) works, but | |
177 | * no doubt some future kernel release will change that, and we'll be | |
178 | * on to yet another method of dealing with this. | |
179 | * Normally only one of rcvhdr_tailaddr or rhf_offset is useful | |
180 | * since the chips with non-zero rhf_offset don't normally | |
181 | * enable tail register updates to host memory, but for testing, | |
182 | * both can be enabled and used. | |
183 | */ | |
184 | kinfo->spi_rcvhdr_base = (u64) rcd->rcvhdrq_phys; | |
185 | kinfo->spi_rcvhdr_tailaddr = (u64) rcd->rcvhdrqtailaddr_phys; | |
186 | kinfo->spi_rhf_offset = dd->rhf_offset; | |
187 | kinfo->spi_rcv_egrbufs = (u64) rcd->rcvegr_phys; | |
188 | kinfo->spi_pioavailaddr = (u64) dd->pioavailregs_phys; | |
189 | /* setup per-unit (not port) status area for user programs */ | |
190 | kinfo->spi_status = (u64) kinfo->spi_pioavailaddr + | |
191 | (char *) ppd->statusp - | |
192 | (char *) dd->pioavailregs_dma; | |
193 | kinfo->spi_uregbase = (u64) dd->uregbase + dd->ureg_align * rcd->ctxt; | |
194 | if (!shared) { | |
195 | kinfo->spi_piocnt = rcd->piocnt; | |
196 | kinfo->spi_piobufbase = (u64) rcd->piobufs; | |
197 | kinfo->spi_sendbuf_status = cvt_kvaddr(rcd->user_event_mask); | |
198 | } else if (master) { | |
199 | kinfo->spi_piocnt = (rcd->piocnt / subctxt_cnt) + | |
200 | (rcd->piocnt % subctxt_cnt); | |
201 | /* Master's PIO buffers are after all the slave's */ | |
202 | kinfo->spi_piobufbase = (u64) rcd->piobufs + | |
203 | dd->palign * | |
204 | (rcd->piocnt - kinfo->spi_piocnt); | |
205 | } else { | |
206 | unsigned slave = subctxt_fp(fp) - 1; | |
207 | ||
208 | kinfo->spi_piocnt = rcd->piocnt / subctxt_cnt; | |
209 | kinfo->spi_piobufbase = (u64) rcd->piobufs + | |
210 | dd->palign * kinfo->spi_piocnt * slave; | |
211 | } | |
212 | ||
213 | if (shared) { | |
214 | kinfo->spi_sendbuf_status = | |
215 | cvt_kvaddr(&rcd->user_event_mask[subctxt_fp(fp)]); | |
216 | /* only spi_subctxt_* fields should be set in this block! */ | |
217 | kinfo->spi_subctxt_uregbase = cvt_kvaddr(rcd->subctxt_uregbase); | |
218 | ||
219 | kinfo->spi_subctxt_rcvegrbuf = | |
220 | cvt_kvaddr(rcd->subctxt_rcvegrbuf); | |
221 | kinfo->spi_subctxt_rcvhdr_base = | |
222 | cvt_kvaddr(rcd->subctxt_rcvhdr_base); | |
223 | } | |
224 | ||
225 | /* | |
226 | * All user buffers are 2KB buffers. If we ever support | |
227 | * giving 4KB buffers to user processes, this will need some | |
228 | * work. Can't use piobufbase directly, because it has | |
229 | * both 2K and 4K buffer base values. | |
230 | */ | |
231 | kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->pio2k_bufbase) / | |
232 | dd->palign; | |
233 | kinfo->spi_pioalign = dd->palign; | |
234 | kinfo->spi_qpair = QIB_KD_QP; | |
235 | /* | |
236 | * user mode PIO buffers are always 2KB, even when 4KB can | |
237 | * be received, and sent via the kernel; this is ibmaxlen | |
238 | * for 2K MTU. | |
239 | */ | |
240 | kinfo->spi_piosize = dd->piosize2k - 2 * sizeof(u32); | |
241 | kinfo->spi_mtu = ppd->ibmaxlen; /* maxlen, not ibmtu */ | |
242 | kinfo->spi_ctxt = rcd->ctxt; | |
243 | kinfo->spi_subctxt = subctxt_fp(fp); | |
244 | kinfo->spi_sw_version = QIB_KERN_SWVERSION; | |
245 | kinfo->spi_sw_version |= 1U << 31; /* QLogic-built, not kernel.org */ | |
246 | kinfo->spi_hw_version = dd->revision; | |
247 | ||
248 | if (master) | |
249 | kinfo->spi_runtime_flags |= QIB_RUNTIME_MASTER; | |
250 | ||
251 | sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo); | |
252 | if (copy_to_user(ubase, kinfo, sz)) | |
253 | ret = -EFAULT; | |
254 | bail: | |
255 | kfree(kinfo); | |
256 | return ret; | |
257 | } | |
258 | ||
259 | /** | |
260 | * qib_tid_update - update a context TID | |
261 | * @rcd: the context | |
262 | * @fp: the qib device file | |
263 | * @ti: the TID information | |
264 | * | |
265 | * The new implementation as of Oct 2004 is that the driver assigns | |
266 | * the tid and returns it to the caller. To reduce search time, we | |
267 | * keep a cursor for each context, walking the shadow tid array to find | |
268 | * one that's not in use. | |
269 | * | |
270 | * For now, if we can't allocate the full list, we fail, although | |
271 | * in the long run, we'll allocate as many as we can, and the | |
272 | * caller will deal with that by trying the remaining pages later. | |
273 | * That means that when we fail, we have to mark the tids as not in | |
274 | * use again, in our shadow copy. | |
275 | * | |
276 | * It's up to the caller to free the tids when they are done. | |
277 | * We'll unlock the pages as they free them. | |
278 | * | |
279 | * Also, right now we are locking one page at a time, but since | |
280 | * the intended use of this routine is for a single group of | |
281 | * virtually contiguous pages, that should change to improve | |
282 | * performance. | |
283 | */ | |
284 | static int qib_tid_update(struct qib_ctxtdata *rcd, struct file *fp, | |
285 | const struct qib_tid_info *ti) | |
286 | { | |
287 | int ret = 0, ntids; | |
288 | u32 tid, ctxttid, cnt, i, tidcnt, tidoff; | |
289 | u16 *tidlist; | |
290 | struct qib_devdata *dd = rcd->dd; | |
291 | u64 physaddr; | |
292 | unsigned long vaddr; | |
293 | u64 __iomem *tidbase; | |
294 | unsigned long tidmap[8]; | |
295 | struct page **pagep = NULL; | |
296 | unsigned subctxt = subctxt_fp(fp); | |
297 | ||
298 | if (!dd->pageshadow) { | |
299 | ret = -ENOMEM; | |
300 | goto done; | |
301 | } | |
302 | ||
303 | cnt = ti->tidcnt; | |
304 | if (!cnt) { | |
305 | ret = -EFAULT; | |
306 | goto done; | |
307 | } | |
308 | ctxttid = rcd->ctxt * dd->rcvtidcnt; | |
309 | if (!rcd->subctxt_cnt) { | |
310 | tidcnt = dd->rcvtidcnt; | |
311 | tid = rcd->tidcursor; | |
312 | tidoff = 0; | |
313 | } else if (!subctxt) { | |
314 | tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) + | |
315 | (dd->rcvtidcnt % rcd->subctxt_cnt); | |
316 | tidoff = dd->rcvtidcnt - tidcnt; | |
317 | ctxttid += tidoff; | |
318 | tid = tidcursor_fp(fp); | |
319 | } else { | |
320 | tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt; | |
321 | tidoff = tidcnt * (subctxt - 1); | |
322 | ctxttid += tidoff; | |
323 | tid = tidcursor_fp(fp); | |
324 | } | |
325 | if (cnt > tidcnt) { | |
326 | /* make sure it all fits in tid_pg_list */ | |
7fac3301 MM |
327 | qib_devinfo(dd->pcidev, |
328 | "Process tried to allocate %u TIDs, only trying max (%u)\n", | |
329 | cnt, tidcnt); | |
f931551b RC |
330 | cnt = tidcnt; |
331 | } | |
332 | pagep = (struct page **) rcd->tid_pg_list; | |
333 | tidlist = (u16 *) &pagep[dd->rcvtidcnt]; | |
334 | pagep += tidoff; | |
335 | tidlist += tidoff; | |
336 | ||
337 | memset(tidmap, 0, sizeof(tidmap)); | |
338 | /* before decrement; chip actual # */ | |
339 | ntids = tidcnt; | |
340 | tidbase = (u64 __iomem *) (((char __iomem *) dd->kregbase) + | |
341 | dd->rcvtidbase + | |
342 | ctxttid * sizeof(*tidbase)); | |
343 | ||
344 | /* virtual address of first page in transfer */ | |
345 | vaddr = ti->tidvaddr; | |
346 | if (!access_ok(VERIFY_WRITE, (void __user *) vaddr, | |
347 | cnt * PAGE_SIZE)) { | |
348 | ret = -EFAULT; | |
349 | goto done; | |
350 | } | |
351 | ret = qib_get_user_pages(vaddr, cnt, pagep); | |
352 | if (ret) { | |
353 | /* | |
354 | * if (ret == -EBUSY) | |
355 | * We can't continue because the pagep array won't be | |
356 | * initialized. This should never happen, | |
357 | * unless perhaps the user has mpin'ed the pages | |
358 | * themselves. | |
359 | */ | |
a46a2802 MM |
360 | qib_devinfo( |
361 | dd->pcidev, | |
362 | "Failed to lock addr %p, %u pages: errno %d\n", | |
363 | (void *) vaddr, cnt, -ret); | |
f931551b RC |
364 | goto done; |
365 | } | |
366 | for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) { | |
367 | for (; ntids--; tid++) { | |
368 | if (tid == tidcnt) | |
369 | tid = 0; | |
370 | if (!dd->pageshadow[ctxttid + tid]) | |
371 | break; | |
372 | } | |
373 | if (ntids < 0) { | |
374 | /* | |
375 | * Oops, wrapped all the way through their TIDs, | |
376 | * and didn't have enough free; see comments at | |
377 | * start of routine | |
378 | */ | |
379 | i--; /* last tidlist[i] not filled in */ | |
380 | ret = -ENOMEM; | |
381 | break; | |
382 | } | |
383 | tidlist[i] = tid + tidoff; | |
384 | /* we "know" system pages and TID pages are same size */ | |
385 | dd->pageshadow[ctxttid + tid] = pagep[i]; | |
386 | dd->physshadow[ctxttid + tid] = | |
387 | qib_map_page(dd->pcidev, pagep[i], 0, PAGE_SIZE, | |
388 | PCI_DMA_FROMDEVICE); | |
389 | /* | |
390 | * don't need atomic or it's overhead | |
391 | */ | |
392 | __set_bit(tid, tidmap); | |
393 | physaddr = dd->physshadow[ctxttid + tid]; | |
394 | /* PERFORMANCE: below should almost certainly be cached */ | |
395 | dd->f_put_tid(dd, &tidbase[tid], | |
396 | RCVHQ_RCV_TYPE_EXPECTED, physaddr); | |
397 | /* | |
398 | * don't check this tid in qib_ctxtshadow, since we | |
399 | * just filled it in; start with the next one. | |
400 | */ | |
401 | tid++; | |
402 | } | |
403 | ||
404 | if (ret) { | |
405 | u32 limit; | |
406 | cleanup: | |
407 | /* jump here if copy out of updated info failed... */ | |
408 | /* same code that's in qib_free_tid() */ | |
409 | limit = sizeof(tidmap) * BITS_PER_BYTE; | |
410 | if (limit > tidcnt) | |
411 | /* just in case size changes in future */ | |
412 | limit = tidcnt; | |
413 | tid = find_first_bit((const unsigned long *)tidmap, limit); | |
414 | for (; tid < limit; tid++) { | |
415 | if (!test_bit(tid, tidmap)) | |
416 | continue; | |
417 | if (dd->pageshadow[ctxttid + tid]) { | |
418 | dma_addr_t phys; | |
419 | ||
420 | phys = dd->physshadow[ctxttid + tid]; | |
421 | dd->physshadow[ctxttid + tid] = dd->tidinvalid; | |
422 | /* PERFORMANCE: below should almost certainly | |
423 | * be cached | |
424 | */ | |
425 | dd->f_put_tid(dd, &tidbase[tid], | |
426 | RCVHQ_RCV_TYPE_EXPECTED, | |
427 | dd->tidinvalid); | |
428 | pci_unmap_page(dd->pcidev, phys, PAGE_SIZE, | |
429 | PCI_DMA_FROMDEVICE); | |
430 | dd->pageshadow[ctxttid + tid] = NULL; | |
431 | } | |
432 | } | |
433 | qib_release_user_pages(pagep, cnt); | |
434 | } else { | |
435 | /* | |
436 | * Copy the updated array, with qib_tid's filled in, back | |
437 | * to user. Since we did the copy in already, this "should | |
438 | * never fail" If it does, we have to clean up... | |
439 | */ | |
440 | if (copy_to_user((void __user *) | |
441 | (unsigned long) ti->tidlist, | |
442 | tidlist, cnt * sizeof(*tidlist))) { | |
443 | ret = -EFAULT; | |
444 | goto cleanup; | |
445 | } | |
446 | if (copy_to_user((void __user *) (unsigned long) ti->tidmap, | |
041af0bb | 447 | tidmap, sizeof(tidmap))) { |
f931551b RC |
448 | ret = -EFAULT; |
449 | goto cleanup; | |
450 | } | |
451 | if (tid == tidcnt) | |
452 | tid = 0; | |
453 | if (!rcd->subctxt_cnt) | |
454 | rcd->tidcursor = tid; | |
455 | else | |
456 | tidcursor_fp(fp) = tid; | |
457 | } | |
458 | ||
459 | done: | |
460 | return ret; | |
461 | } | |
462 | ||
463 | /** | |
464 | * qib_tid_free - free a context TID | |
465 | * @rcd: the context | |
466 | * @subctxt: the subcontext | |
467 | * @ti: the TID info | |
468 | * | |
469 | * right now we are unlocking one page at a time, but since | |
470 | * the intended use of this routine is for a single group of | |
471 | * virtually contiguous pages, that should change to improve | |
472 | * performance. We check that the TID is in range for this context | |
473 | * but otherwise don't check validity; if user has an error and | |
474 | * frees the wrong tid, it's only their own data that can thereby | |
475 | * be corrupted. We do check that the TID was in use, for sanity | |
476 | * We always use our idea of the saved address, not the address that | |
477 | * they pass in to us. | |
478 | */ | |
479 | static int qib_tid_free(struct qib_ctxtdata *rcd, unsigned subctxt, | |
480 | const struct qib_tid_info *ti) | |
481 | { | |
482 | int ret = 0; | |
483 | u32 tid, ctxttid, cnt, limit, tidcnt; | |
484 | struct qib_devdata *dd = rcd->dd; | |
485 | u64 __iomem *tidbase; | |
486 | unsigned long tidmap[8]; | |
487 | ||
488 | if (!dd->pageshadow) { | |
489 | ret = -ENOMEM; | |
490 | goto done; | |
491 | } | |
492 | ||
493 | if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap, | |
041af0bb | 494 | sizeof(tidmap))) { |
f931551b RC |
495 | ret = -EFAULT; |
496 | goto done; | |
497 | } | |
498 | ||
499 | ctxttid = rcd->ctxt * dd->rcvtidcnt; | |
500 | if (!rcd->subctxt_cnt) | |
501 | tidcnt = dd->rcvtidcnt; | |
502 | else if (!subctxt) { | |
503 | tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) + | |
504 | (dd->rcvtidcnt % rcd->subctxt_cnt); | |
505 | ctxttid += dd->rcvtidcnt - tidcnt; | |
506 | } else { | |
507 | tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt; | |
508 | ctxttid += tidcnt * (subctxt - 1); | |
509 | } | |
510 | tidbase = (u64 __iomem *) ((char __iomem *)(dd->kregbase) + | |
511 | dd->rcvtidbase + | |
512 | ctxttid * sizeof(*tidbase)); | |
513 | ||
514 | limit = sizeof(tidmap) * BITS_PER_BYTE; | |
515 | if (limit > tidcnt) | |
516 | /* just in case size changes in future */ | |
517 | limit = tidcnt; | |
518 | tid = find_first_bit(tidmap, limit); | |
519 | for (cnt = 0; tid < limit; tid++) { | |
520 | /* | |
521 | * small optimization; if we detect a run of 3 or so without | |
522 | * any set, use find_first_bit again. That's mainly to | |
523 | * accelerate the case where we wrapped, so we have some at | |
524 | * the beginning, and some at the end, and a big gap | |
525 | * in the middle. | |
526 | */ | |
527 | if (!test_bit(tid, tidmap)) | |
528 | continue; | |
529 | cnt++; | |
530 | if (dd->pageshadow[ctxttid + tid]) { | |
531 | struct page *p; | |
532 | dma_addr_t phys; | |
533 | ||
534 | p = dd->pageshadow[ctxttid + tid]; | |
535 | dd->pageshadow[ctxttid + tid] = NULL; | |
536 | phys = dd->physshadow[ctxttid + tid]; | |
537 | dd->physshadow[ctxttid + tid] = dd->tidinvalid; | |
538 | /* PERFORMANCE: below should almost certainly be | |
539 | * cached | |
540 | */ | |
541 | dd->f_put_tid(dd, &tidbase[tid], | |
542 | RCVHQ_RCV_TYPE_EXPECTED, dd->tidinvalid); | |
543 | pci_unmap_page(dd->pcidev, phys, PAGE_SIZE, | |
544 | PCI_DMA_FROMDEVICE); | |
545 | qib_release_user_pages(&p, 1); | |
546 | } | |
547 | } | |
548 | done: | |
549 | return ret; | |
550 | } | |
551 | ||
552 | /** | |
553 | * qib_set_part_key - set a partition key | |
554 | * @rcd: the context | |
555 | * @key: the key | |
556 | * | |
557 | * We can have up to 4 active at a time (other than the default, which is | |
558 | * always allowed). This is somewhat tricky, since multiple contexts may set | |
559 | * the same key, so we reference count them, and clean up at exit. All 4 | |
560 | * partition keys are packed into a single qlogic_ib register. It's an | |
561 | * error for a process to set the same pkey multiple times. We provide no | |
562 | * mechanism to de-allocate a pkey at this time, we may eventually need to | |
563 | * do that. I've used the atomic operations, and no locking, and only make | |
564 | * a single pass through what's available. This should be more than | |
565 | * adequate for some time. I'll think about spinlocks or the like if and as | |
566 | * it's necessary. | |
567 | */ | |
568 | static int qib_set_part_key(struct qib_ctxtdata *rcd, u16 key) | |
569 | { | |
570 | struct qib_pportdata *ppd = rcd->ppd; | |
571 | int i, any = 0, pidx = -1; | |
572 | u16 lkey = key & 0x7FFF; | |
573 | int ret; | |
574 | ||
575 | if (lkey == (QIB_DEFAULT_P_KEY & 0x7FFF)) { | |
576 | /* nothing to do; this key always valid */ | |
577 | ret = 0; | |
578 | goto bail; | |
579 | } | |
580 | ||
581 | if (!lkey) { | |
582 | ret = -EINVAL; | |
583 | goto bail; | |
584 | } | |
585 | ||
586 | /* | |
587 | * Set the full membership bit, because it has to be | |
588 | * set in the register or the packet, and it seems | |
589 | * cleaner to set in the register than to force all | |
590 | * callers to set it. | |
591 | */ | |
592 | key |= 0x8000; | |
593 | ||
594 | for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) { | |
595 | if (!rcd->pkeys[i] && pidx == -1) | |
596 | pidx = i; | |
597 | if (rcd->pkeys[i] == key) { | |
598 | ret = -EEXIST; | |
599 | goto bail; | |
600 | } | |
601 | } | |
602 | if (pidx == -1) { | |
603 | ret = -EBUSY; | |
604 | goto bail; | |
605 | } | |
606 | for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) { | |
607 | if (!ppd->pkeys[i]) { | |
608 | any++; | |
609 | continue; | |
610 | } | |
611 | if (ppd->pkeys[i] == key) { | |
612 | atomic_t *pkrefs = &ppd->pkeyrefs[i]; | |
613 | ||
614 | if (atomic_inc_return(pkrefs) > 1) { | |
615 | rcd->pkeys[pidx] = key; | |
616 | ret = 0; | |
617 | goto bail; | |
618 | } else { | |
619 | /* | |
620 | * lost race, decrement count, catch below | |
621 | */ | |
622 | atomic_dec(pkrefs); | |
623 | any++; | |
624 | } | |
625 | } | |
626 | if ((ppd->pkeys[i] & 0x7FFF) == lkey) { | |
627 | /* | |
628 | * It makes no sense to have both the limited and | |
629 | * full membership PKEY set at the same time since | |
630 | * the unlimited one will disable the limited one. | |
631 | */ | |
632 | ret = -EEXIST; | |
633 | goto bail; | |
634 | } | |
635 | } | |
636 | if (!any) { | |
637 | ret = -EBUSY; | |
638 | goto bail; | |
639 | } | |
640 | for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) { | |
641 | if (!ppd->pkeys[i] && | |
642 | atomic_inc_return(&ppd->pkeyrefs[i]) == 1) { | |
643 | rcd->pkeys[pidx] = key; | |
644 | ppd->pkeys[i] = key; | |
645 | (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0); | |
646 | ret = 0; | |
647 | goto bail; | |
648 | } | |
649 | } | |
650 | ret = -EBUSY; | |
651 | ||
652 | bail: | |
653 | return ret; | |
654 | } | |
655 | ||
656 | /** | |
657 | * qib_manage_rcvq - manage a context's receive queue | |
658 | * @rcd: the context | |
659 | * @subctxt: the subcontext | |
660 | * @start_stop: action to carry out | |
661 | * | |
662 | * start_stop == 0 disables receive on the context, for use in queue | |
663 | * overflow conditions. start_stop==1 re-enables, to be used to | |
664 | * re-init the software copy of the head register | |
665 | */ | |
666 | static int qib_manage_rcvq(struct qib_ctxtdata *rcd, unsigned subctxt, | |
667 | int start_stop) | |
668 | { | |
669 | struct qib_devdata *dd = rcd->dd; | |
670 | unsigned int rcvctrl_op; | |
671 | ||
672 | if (subctxt) | |
673 | goto bail; | |
674 | /* atomically clear receive enable ctxt. */ | |
675 | if (start_stop) { | |
676 | /* | |
677 | * On enable, force in-memory copy of the tail register to | |
678 | * 0, so that protocol code doesn't have to worry about | |
679 | * whether or not the chip has yet updated the in-memory | |
680 | * copy or not on return from the system call. The chip | |
681 | * always resets it's tail register back to 0 on a | |
682 | * transition from disabled to enabled. | |
683 | */ | |
684 | if (rcd->rcvhdrtail_kvaddr) | |
685 | qib_clear_rcvhdrtail(rcd); | |
686 | rcvctrl_op = QIB_RCVCTRL_CTXT_ENB; | |
687 | } else | |
688 | rcvctrl_op = QIB_RCVCTRL_CTXT_DIS; | |
689 | dd->f_rcvctrl(rcd->ppd, rcvctrl_op, rcd->ctxt); | |
690 | /* always; new head should be equal to new tail; see above */ | |
691 | bail: | |
692 | return 0; | |
693 | } | |
694 | ||
695 | static void qib_clean_part_key(struct qib_ctxtdata *rcd, | |
696 | struct qib_devdata *dd) | |
697 | { | |
698 | int i, j, pchanged = 0; | |
699 | u64 oldpkey; | |
700 | struct qib_pportdata *ppd = rcd->ppd; | |
701 | ||
702 | /* for debugging only */ | |
703 | oldpkey = (u64) ppd->pkeys[0] | | |
704 | ((u64) ppd->pkeys[1] << 16) | | |
705 | ((u64) ppd->pkeys[2] << 32) | | |
706 | ((u64) ppd->pkeys[3] << 48); | |
707 | ||
708 | for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) { | |
709 | if (!rcd->pkeys[i]) | |
710 | continue; | |
711 | for (j = 0; j < ARRAY_SIZE(ppd->pkeys); j++) { | |
712 | /* check for match independent of the global bit */ | |
713 | if ((ppd->pkeys[j] & 0x7fff) != | |
714 | (rcd->pkeys[i] & 0x7fff)) | |
715 | continue; | |
716 | if (atomic_dec_and_test(&ppd->pkeyrefs[j])) { | |
717 | ppd->pkeys[j] = 0; | |
718 | pchanged++; | |
719 | } | |
720 | break; | |
721 | } | |
722 | rcd->pkeys[i] = 0; | |
723 | } | |
724 | if (pchanged) | |
725 | (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0); | |
726 | } | |
727 | ||
728 | /* common code for the mappings on dma_alloc_coherent mem */ | |
729 | static int qib_mmap_mem(struct vm_area_struct *vma, struct qib_ctxtdata *rcd, | |
730 | unsigned len, void *kvaddr, u32 write_ok, char *what) | |
731 | { | |
732 | struct qib_devdata *dd = rcd->dd; | |
733 | unsigned long pfn; | |
734 | int ret; | |
735 | ||
736 | if ((vma->vm_end - vma->vm_start) > len) { | |
737 | qib_devinfo(dd->pcidev, | |
738 | "FAIL on %s: len %lx > %x\n", what, | |
739 | vma->vm_end - vma->vm_start, len); | |
740 | ret = -EFAULT; | |
741 | goto bail; | |
742 | } | |
743 | ||
744 | /* | |
745 | * shared context user code requires rcvhdrq mapped r/w, others | |
746 | * only allowed readonly mapping. | |
747 | */ | |
748 | if (!write_ok) { | |
749 | if (vma->vm_flags & VM_WRITE) { | |
750 | qib_devinfo(dd->pcidev, | |
751 | "%s must be mapped readonly\n", what); | |
752 | ret = -EPERM; | |
753 | goto bail; | |
754 | } | |
755 | ||
756 | /* don't allow them to later change with mprotect */ | |
757 | vma->vm_flags &= ~VM_MAYWRITE; | |
758 | } | |
759 | ||
760 | pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT; | |
761 | ret = remap_pfn_range(vma, vma->vm_start, pfn, | |
762 | len, vma->vm_page_prot); | |
763 | if (ret) | |
7fac3301 MM |
764 | qib_devinfo(dd->pcidev, |
765 | "%s ctxt%u mmap of %lx, %x bytes failed: %d\n", | |
766 | what, rcd->ctxt, pfn, len, ret); | |
f931551b RC |
767 | bail: |
768 | return ret; | |
769 | } | |
770 | ||
771 | static int mmap_ureg(struct vm_area_struct *vma, struct qib_devdata *dd, | |
772 | u64 ureg) | |
773 | { | |
774 | unsigned long phys; | |
775 | unsigned long sz; | |
776 | int ret; | |
777 | ||
778 | /* | |
779 | * This is real hardware, so use io_remap. This is the mechanism | |
780 | * for the user process to update the head registers for their ctxt | |
781 | * in the chip. | |
782 | */ | |
783 | sz = dd->flags & QIB_HAS_HDRSUPP ? 2 * PAGE_SIZE : PAGE_SIZE; | |
784 | if ((vma->vm_end - vma->vm_start) > sz) { | |
7fac3301 MM |
785 | qib_devinfo(dd->pcidev, |
786 | "FAIL mmap userreg: reqlen %lx > PAGE\n", | |
787 | vma->vm_end - vma->vm_start); | |
f931551b RC |
788 | ret = -EFAULT; |
789 | } else { | |
790 | phys = dd->physaddr + ureg; | |
791 | vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); | |
792 | ||
793 | vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; | |
794 | ret = io_remap_pfn_range(vma, vma->vm_start, | |
795 | phys >> PAGE_SHIFT, | |
796 | vma->vm_end - vma->vm_start, | |
797 | vma->vm_page_prot); | |
798 | } | |
799 | return ret; | |
800 | } | |
801 | ||
802 | static int mmap_piobufs(struct vm_area_struct *vma, | |
803 | struct qib_devdata *dd, | |
804 | struct qib_ctxtdata *rcd, | |
805 | unsigned piobufs, unsigned piocnt) | |
806 | { | |
807 | unsigned long phys; | |
808 | int ret; | |
809 | ||
810 | /* | |
811 | * When we map the PIO buffers in the chip, we want to map them as | |
812 | * writeonly, no read possible; unfortunately, x86 doesn't allow | |
813 | * for this in hardware, but we still prevent users from asking | |
814 | * for it. | |
815 | */ | |
816 | if ((vma->vm_end - vma->vm_start) > (piocnt * dd->palign)) { | |
7fac3301 MM |
817 | qib_devinfo(dd->pcidev, |
818 | "FAIL mmap piobufs: reqlen %lx > PAGE\n", | |
f931551b RC |
819 | vma->vm_end - vma->vm_start); |
820 | ret = -EINVAL; | |
821 | goto bail; | |
822 | } | |
823 | ||
824 | phys = dd->physaddr + piobufs; | |
825 | ||
826 | #if defined(__powerpc__) | |
827 | /* There isn't a generic way to specify writethrough mappings */ | |
828 | pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; | |
829 | pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU; | |
830 | pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED; | |
831 | #endif | |
832 | ||
833 | /* | |
834 | * don't allow them to later change to readable with mprotect (for when | |
835 | * not initially mapped readable, as is normally the case) | |
836 | */ | |
837 | vma->vm_flags &= ~VM_MAYREAD; | |
838 | vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND; | |
839 | ||
d4988623 LR |
840 | /* We used PAT if wc_cookie == 0 */ |
841 | if (!dd->wc_cookie) | |
f931551b RC |
842 | vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); |
843 | ||
844 | ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT, | |
845 | vma->vm_end - vma->vm_start, | |
846 | vma->vm_page_prot); | |
847 | bail: | |
848 | return ret; | |
849 | } | |
850 | ||
851 | static int mmap_rcvegrbufs(struct vm_area_struct *vma, | |
852 | struct qib_ctxtdata *rcd) | |
853 | { | |
854 | struct qib_devdata *dd = rcd->dd; | |
855 | unsigned long start, size; | |
856 | size_t total_size, i; | |
857 | unsigned long pfn; | |
858 | int ret; | |
859 | ||
860 | size = rcd->rcvegrbuf_size; | |
861 | total_size = rcd->rcvegrbuf_chunks * size; | |
862 | if ((vma->vm_end - vma->vm_start) > total_size) { | |
7fac3301 MM |
863 | qib_devinfo(dd->pcidev, |
864 | "FAIL on egr bufs: reqlen %lx > actual %lx\n", | |
f931551b RC |
865 | vma->vm_end - vma->vm_start, |
866 | (unsigned long) total_size); | |
867 | ret = -EINVAL; | |
868 | goto bail; | |
869 | } | |
870 | ||
871 | if (vma->vm_flags & VM_WRITE) { | |
7fac3301 MM |
872 | qib_devinfo(dd->pcidev, |
873 | "Can't map eager buffers as writable (flags=%lx)\n", | |
874 | vma->vm_flags); | |
f931551b RC |
875 | ret = -EPERM; |
876 | goto bail; | |
877 | } | |
878 | /* don't allow them to later change to writeable with mprotect */ | |
879 | vma->vm_flags &= ~VM_MAYWRITE; | |
880 | ||
881 | start = vma->vm_start; | |
882 | ||
883 | for (i = 0; i < rcd->rcvegrbuf_chunks; i++, start += size) { | |
884 | pfn = virt_to_phys(rcd->rcvegrbuf[i]) >> PAGE_SHIFT; | |
885 | ret = remap_pfn_range(vma, start, pfn, size, | |
886 | vma->vm_page_prot); | |
887 | if (ret < 0) | |
888 | goto bail; | |
889 | } | |
890 | ret = 0; | |
891 | ||
892 | bail: | |
893 | return ret; | |
894 | } | |
895 | ||
896 | /* | |
897 | * qib_file_vma_fault - handle a VMA page fault. | |
898 | */ | |
899 | static int qib_file_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) | |
900 | { | |
901 | struct page *page; | |
902 | ||
903 | page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT)); | |
904 | if (!page) | |
905 | return VM_FAULT_SIGBUS; | |
906 | ||
907 | get_page(page); | |
908 | vmf->page = page; | |
909 | ||
910 | return 0; | |
911 | } | |
912 | ||
7cbea8dc | 913 | static const struct vm_operations_struct qib_file_vm_ops = { |
f931551b RC |
914 | .fault = qib_file_vma_fault, |
915 | }; | |
916 | ||
917 | static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr, | |
918 | struct qib_ctxtdata *rcd, unsigned subctxt) | |
919 | { | |
920 | struct qib_devdata *dd = rcd->dd; | |
921 | unsigned subctxt_cnt; | |
922 | unsigned long len; | |
923 | void *addr; | |
924 | size_t size; | |
925 | int ret = 0; | |
926 | ||
927 | subctxt_cnt = rcd->subctxt_cnt; | |
928 | size = rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size; | |
929 | ||
930 | /* | |
931 | * Each process has all the subctxt uregbase, rcvhdrq, and | |
932 | * rcvegrbufs mmapped - as an array for all the processes, | |
933 | * and also separately for this process. | |
934 | */ | |
935 | if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase)) { | |
936 | addr = rcd->subctxt_uregbase; | |
937 | size = PAGE_SIZE * subctxt_cnt; | |
938 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base)) { | |
939 | addr = rcd->subctxt_rcvhdr_base; | |
940 | size = rcd->rcvhdrq_size * subctxt_cnt; | |
941 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf)) { | |
942 | addr = rcd->subctxt_rcvegrbuf; | |
943 | size *= subctxt_cnt; | |
944 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase + | |
945 | PAGE_SIZE * subctxt)) { | |
946 | addr = rcd->subctxt_uregbase + PAGE_SIZE * subctxt; | |
947 | size = PAGE_SIZE; | |
948 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base + | |
949 | rcd->rcvhdrq_size * subctxt)) { | |
950 | addr = rcd->subctxt_rcvhdr_base + | |
951 | rcd->rcvhdrq_size * subctxt; | |
952 | size = rcd->rcvhdrq_size; | |
953 | } else if (pgaddr == cvt_kvaddr(&rcd->user_event_mask[subctxt])) { | |
954 | addr = rcd->user_event_mask; | |
955 | size = PAGE_SIZE; | |
956 | } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf + | |
957 | size * subctxt)) { | |
958 | addr = rcd->subctxt_rcvegrbuf + size * subctxt; | |
959 | /* rcvegrbufs are read-only on the slave */ | |
960 | if (vma->vm_flags & VM_WRITE) { | |
961 | qib_devinfo(dd->pcidev, | |
a46a2802 MM |
962 | "Can't map eager buffers as writable (flags=%lx)\n", |
963 | vma->vm_flags); | |
f931551b RC |
964 | ret = -EPERM; |
965 | goto bail; | |
966 | } | |
967 | /* | |
968 | * Don't allow permission to later change to writeable | |
969 | * with mprotect. | |
970 | */ | |
971 | vma->vm_flags &= ~VM_MAYWRITE; | |
972 | } else | |
973 | goto bail; | |
974 | len = vma->vm_end - vma->vm_start; | |
975 | if (len > size) { | |
976 | ret = -EINVAL; | |
977 | goto bail; | |
978 | } | |
979 | ||
980 | vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT; | |
981 | vma->vm_ops = &qib_file_vm_ops; | |
314e51b9 | 982 | vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; |
f931551b RC |
983 | ret = 1; |
984 | ||
985 | bail: | |
986 | return ret; | |
987 | } | |
988 | ||
989 | /** | |
990 | * qib_mmapf - mmap various structures into user space | |
991 | * @fp: the file pointer | |
992 | * @vma: the VM area | |
993 | * | |
994 | * We use this to have a shared buffer between the kernel and the user code | |
995 | * for the rcvhdr queue, egr buffers, and the per-context user regs and pio | |
996 | * buffers in the chip. We have the open and close entries so we can bump | |
997 | * the ref count and keep the driver from being unloaded while still mapped. | |
998 | */ | |
999 | static int qib_mmapf(struct file *fp, struct vm_area_struct *vma) | |
1000 | { | |
1001 | struct qib_ctxtdata *rcd; | |
1002 | struct qib_devdata *dd; | |
1003 | u64 pgaddr, ureg; | |
1004 | unsigned piobufs, piocnt; | |
1005 | int ret, match = 1; | |
1006 | ||
1007 | rcd = ctxt_fp(fp); | |
1008 | if (!rcd || !(vma->vm_flags & VM_SHARED)) { | |
1009 | ret = -EINVAL; | |
1010 | goto bail; | |
1011 | } | |
1012 | dd = rcd->dd; | |
1013 | ||
1014 | /* | |
1015 | * This is the qib_do_user_init() code, mapping the shared buffers | |
1016 | * and per-context user registers into the user process. The address | |
1017 | * referred to by vm_pgoff is the file offset passed via mmap(). | |
1018 | * For shared contexts, this is the kernel vmalloc() address of the | |
1019 | * pages to share with the master. | |
1020 | * For non-shared or master ctxts, this is a physical address. | |
1021 | * We only do one mmap for each space mapped. | |
1022 | */ | |
1023 | pgaddr = vma->vm_pgoff << PAGE_SHIFT; | |
1024 | ||
1025 | /* | |
1026 | * Check for 0 in case one of the allocations failed, but user | |
1027 | * called mmap anyway. | |
1028 | */ | |
1029 | if (!pgaddr) { | |
1030 | ret = -EINVAL; | |
1031 | goto bail; | |
1032 | } | |
1033 | ||
1034 | /* | |
1035 | * Physical addresses must fit in 40 bits for our hardware. | |
1036 | * Check for kernel virtual addresses first, anything else must | |
1037 | * match a HW or memory address. | |
1038 | */ | |
1039 | ret = mmap_kvaddr(vma, pgaddr, rcd, subctxt_fp(fp)); | |
1040 | if (ret) { | |
1041 | if (ret > 0) | |
1042 | ret = 0; | |
1043 | goto bail; | |
1044 | } | |
1045 | ||
1046 | ureg = dd->uregbase + dd->ureg_align * rcd->ctxt; | |
1047 | if (!rcd->subctxt_cnt) { | |
1048 | /* ctxt is not shared */ | |
1049 | piocnt = rcd->piocnt; | |
1050 | piobufs = rcd->piobufs; | |
1051 | } else if (!subctxt_fp(fp)) { | |
1052 | /* caller is the master */ | |
1053 | piocnt = (rcd->piocnt / rcd->subctxt_cnt) + | |
1054 | (rcd->piocnt % rcd->subctxt_cnt); | |
1055 | piobufs = rcd->piobufs + | |
1056 | dd->palign * (rcd->piocnt - piocnt); | |
1057 | } else { | |
1058 | unsigned slave = subctxt_fp(fp) - 1; | |
1059 | ||
1060 | /* caller is a slave */ | |
1061 | piocnt = rcd->piocnt / rcd->subctxt_cnt; | |
1062 | piobufs = rcd->piobufs + dd->palign * piocnt * slave; | |
1063 | } | |
1064 | ||
1065 | if (pgaddr == ureg) | |
1066 | ret = mmap_ureg(vma, dd, ureg); | |
1067 | else if (pgaddr == piobufs) | |
1068 | ret = mmap_piobufs(vma, dd, rcd, piobufs, piocnt); | |
1069 | else if (pgaddr == dd->pioavailregs_phys) | |
1070 | /* in-memory copy of pioavail registers */ | |
1071 | ret = qib_mmap_mem(vma, rcd, PAGE_SIZE, | |
1072 | (void *) dd->pioavailregs_dma, 0, | |
1073 | "pioavail registers"); | |
1074 | else if (pgaddr == rcd->rcvegr_phys) | |
1075 | ret = mmap_rcvegrbufs(vma, rcd); | |
1076 | else if (pgaddr == (u64) rcd->rcvhdrq_phys) | |
1077 | /* | |
1078 | * The rcvhdrq itself; multiple pages, contiguous | |
1079 | * from an i/o perspective. Shared contexts need | |
1080 | * to map r/w, so we allow writing. | |
1081 | */ | |
1082 | ret = qib_mmap_mem(vma, rcd, rcd->rcvhdrq_size, | |
1083 | rcd->rcvhdrq, 1, "rcvhdrq"); | |
1084 | else if (pgaddr == (u64) rcd->rcvhdrqtailaddr_phys) | |
1085 | /* in-memory copy of rcvhdrq tail register */ | |
1086 | ret = qib_mmap_mem(vma, rcd, PAGE_SIZE, | |
1087 | rcd->rcvhdrtail_kvaddr, 0, | |
1088 | "rcvhdrq tail"); | |
1089 | else | |
1090 | match = 0; | |
1091 | if (!match) | |
1092 | ret = -EINVAL; | |
1093 | ||
1094 | vma->vm_private_data = NULL; | |
1095 | ||
1096 | if (ret < 0) | |
1097 | qib_devinfo(dd->pcidev, | |
1098 | "mmap Failure %d: off %llx len %lx\n", | |
1099 | -ret, (unsigned long long)pgaddr, | |
1100 | vma->vm_end - vma->vm_start); | |
1101 | bail: | |
1102 | return ret; | |
1103 | } | |
1104 | ||
1105 | static unsigned int qib_poll_urgent(struct qib_ctxtdata *rcd, | |
1106 | struct file *fp, | |
1107 | struct poll_table_struct *pt) | |
1108 | { | |
1109 | struct qib_devdata *dd = rcd->dd; | |
1110 | unsigned pollflag; | |
1111 | ||
1112 | poll_wait(fp, &rcd->wait, pt); | |
1113 | ||
1114 | spin_lock_irq(&dd->uctxt_lock); | |
1115 | if (rcd->urgent != rcd->urgent_poll) { | |
1116 | pollflag = POLLIN | POLLRDNORM; | |
1117 | rcd->urgent_poll = rcd->urgent; | |
1118 | } else { | |
1119 | pollflag = 0; | |
1120 | set_bit(QIB_CTXT_WAITING_URG, &rcd->flag); | |
1121 | } | |
1122 | spin_unlock_irq(&dd->uctxt_lock); | |
1123 | ||
1124 | return pollflag; | |
1125 | } | |
1126 | ||
1127 | static unsigned int qib_poll_next(struct qib_ctxtdata *rcd, | |
1128 | struct file *fp, | |
1129 | struct poll_table_struct *pt) | |
1130 | { | |
1131 | struct qib_devdata *dd = rcd->dd; | |
1132 | unsigned pollflag; | |
1133 | ||
1134 | poll_wait(fp, &rcd->wait, pt); | |
1135 | ||
1136 | spin_lock_irq(&dd->uctxt_lock); | |
1137 | if (dd->f_hdrqempty(rcd)) { | |
1138 | set_bit(QIB_CTXT_WAITING_RCV, &rcd->flag); | |
1139 | dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_INTRAVAIL_ENB, rcd->ctxt); | |
1140 | pollflag = 0; | |
1141 | } else | |
1142 | pollflag = POLLIN | POLLRDNORM; | |
1143 | spin_unlock_irq(&dd->uctxt_lock); | |
1144 | ||
1145 | return pollflag; | |
1146 | } | |
1147 | ||
1148 | static unsigned int qib_poll(struct file *fp, struct poll_table_struct *pt) | |
1149 | { | |
1150 | struct qib_ctxtdata *rcd; | |
1151 | unsigned pollflag; | |
1152 | ||
1153 | rcd = ctxt_fp(fp); | |
1154 | if (!rcd) | |
1155 | pollflag = POLLERR; | |
1156 | else if (rcd->poll_type == QIB_POLL_TYPE_URGENT) | |
1157 | pollflag = qib_poll_urgent(rcd, fp, pt); | |
1158 | else if (rcd->poll_type == QIB_POLL_TYPE_ANYRCV) | |
1159 | pollflag = qib_poll_next(rcd, fp, pt); | |
1160 | else /* invalid */ | |
1161 | pollflag = POLLERR; | |
1162 | ||
1163 | return pollflag; | |
1164 | } | |
1165 | ||
c804f072 RV |
1166 | static void assign_ctxt_affinity(struct file *fp, struct qib_devdata *dd) |
1167 | { | |
1168 | struct qib_filedata *fd = fp->private_data; | |
1169 | const unsigned int weight = cpumask_weight(¤t->cpus_allowed); | |
1170 | const struct cpumask *local_mask = cpumask_of_pcibus(dd->pcidev->bus); | |
1171 | int local_cpu; | |
1172 | ||
1173 | /* | |
1174 | * If process has NOT already set it's affinity, select and | |
1175 | * reserve a processor for it on the local NUMA node. | |
1176 | */ | |
1177 | if ((weight >= qib_cpulist_count) && | |
1178 | (cpumask_weight(local_mask) <= qib_cpulist_count)) { | |
1179 | for_each_cpu(local_cpu, local_mask) | |
1180 | if (!test_and_set_bit(local_cpu, qib_cpulist)) { | |
1181 | fd->rec_cpu_num = local_cpu; | |
1182 | return; | |
1183 | } | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * If process has NOT already set it's affinity, select and | |
1188 | * reserve a processor for it, as a rendevous for all | |
1189 | * users of the driver. If they don't actually later | |
1190 | * set affinity to this cpu, or set it to some other cpu, | |
1191 | * it just means that sooner or later we don't recommend | |
1192 | * a cpu, and let the scheduler do it's best. | |
1193 | */ | |
1194 | if (weight >= qib_cpulist_count) { | |
1195 | int cpu; | |
da12c1f6 | 1196 | |
c804f072 RV |
1197 | cpu = find_first_zero_bit(qib_cpulist, |
1198 | qib_cpulist_count); | |
1199 | if (cpu == qib_cpulist_count) | |
1200 | qib_dev_err(dd, | |
1201 | "no cpus avail for affinity PID %u\n", | |
1202 | current->pid); | |
1203 | else { | |
1204 | __set_bit(cpu, qib_cpulist); | |
1205 | fd->rec_cpu_num = cpu; | |
1206 | } | |
1207 | } | |
1208 | } | |
1209 | ||
f931551b RC |
1210 | /* |
1211 | * Check that userland and driver are compatible for subcontexts. | |
1212 | */ | |
1213 | static int qib_compatible_subctxts(int user_swmajor, int user_swminor) | |
1214 | { | |
1215 | /* this code is written long-hand for clarity */ | |
1216 | if (QIB_USER_SWMAJOR != user_swmajor) { | |
1217 | /* no promise of compatibility if major mismatch */ | |
1218 | return 0; | |
1219 | } | |
1220 | if (QIB_USER_SWMAJOR == 1) { | |
1221 | switch (QIB_USER_SWMINOR) { | |
1222 | case 0: | |
1223 | case 1: | |
1224 | case 2: | |
1225 | /* no subctxt implementation so cannot be compatible */ | |
1226 | return 0; | |
1227 | case 3: | |
1228 | /* 3 is only compatible with itself */ | |
1229 | return user_swminor == 3; | |
1230 | default: | |
1231 | /* >= 4 are compatible (or are expected to be) */ | |
4668e4b5 | 1232 | return user_swminor <= QIB_USER_SWMINOR; |
f931551b RC |
1233 | } |
1234 | } | |
1235 | /* make no promises yet for future major versions */ | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | static int init_subctxts(struct qib_devdata *dd, | |
1240 | struct qib_ctxtdata *rcd, | |
1241 | const struct qib_user_info *uinfo) | |
1242 | { | |
1243 | int ret = 0; | |
1244 | unsigned num_subctxts; | |
1245 | size_t size; | |
1246 | ||
1247 | /* | |
1248 | * If the user is requesting zero subctxts, | |
1249 | * skip the subctxt allocation. | |
1250 | */ | |
1251 | if (uinfo->spu_subctxt_cnt <= 0) | |
1252 | goto bail; | |
1253 | num_subctxts = uinfo->spu_subctxt_cnt; | |
1254 | ||
1255 | /* Check for subctxt compatibility */ | |
1256 | if (!qib_compatible_subctxts(uinfo->spu_userversion >> 16, | |
1257 | uinfo->spu_userversion & 0xffff)) { | |
1258 | qib_devinfo(dd->pcidev, | |
a46a2802 | 1259 | "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 |
1260 | (int) (uinfo->spu_userversion >> 16), |
1261 | (int) (uinfo->spu_userversion & 0xffff), | |
1262 | QIB_USER_SWMAJOR, QIB_USER_SWMINOR); | |
1263 | goto bail; | |
1264 | } | |
1265 | if (num_subctxts > QLOGIC_IB_MAX_SUBCTXT) { | |
1266 | ret = -EINVAL; | |
1267 | goto bail; | |
1268 | } | |
1269 | ||
1270 | rcd->subctxt_uregbase = vmalloc_user(PAGE_SIZE * num_subctxts); | |
1271 | if (!rcd->subctxt_uregbase) { | |
1272 | ret = -ENOMEM; | |
1273 | goto bail; | |
1274 | } | |
1275 | /* Note: rcd->rcvhdrq_size isn't initialized yet. */ | |
1276 | size = ALIGN(dd->rcvhdrcnt * dd->rcvhdrentsize * | |
1277 | sizeof(u32), PAGE_SIZE) * num_subctxts; | |
1278 | rcd->subctxt_rcvhdr_base = vmalloc_user(size); | |
1279 | if (!rcd->subctxt_rcvhdr_base) { | |
1280 | ret = -ENOMEM; | |
1281 | goto bail_ureg; | |
1282 | } | |
1283 | ||
1284 | rcd->subctxt_rcvegrbuf = vmalloc_user(rcd->rcvegrbuf_chunks * | |
1285 | rcd->rcvegrbuf_size * | |
1286 | num_subctxts); | |
1287 | if (!rcd->subctxt_rcvegrbuf) { | |
1288 | ret = -ENOMEM; | |
1289 | goto bail_rhdr; | |
1290 | } | |
1291 | ||
1292 | rcd->subctxt_cnt = uinfo->spu_subctxt_cnt; | |
1293 | rcd->subctxt_id = uinfo->spu_subctxt_id; | |
1294 | rcd->active_slaves = 1; | |
1295 | rcd->redirect_seq_cnt = 1; | |
1296 | set_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag); | |
1297 | goto bail; | |
1298 | ||
1299 | bail_rhdr: | |
1300 | vfree(rcd->subctxt_rcvhdr_base); | |
1301 | bail_ureg: | |
1302 | vfree(rcd->subctxt_uregbase); | |
1303 | rcd->subctxt_uregbase = NULL; | |
1304 | bail: | |
1305 | return ret; | |
1306 | } | |
1307 | ||
1308 | static int setup_ctxt(struct qib_pportdata *ppd, int ctxt, | |
1309 | struct file *fp, const struct qib_user_info *uinfo) | |
1310 | { | |
c804f072 | 1311 | struct qib_filedata *fd = fp->private_data; |
f931551b RC |
1312 | struct qib_devdata *dd = ppd->dd; |
1313 | struct qib_ctxtdata *rcd; | |
1314 | void *ptmp = NULL; | |
1315 | int ret; | |
e0f30bac | 1316 | int numa_id; |
f931551b | 1317 | |
c804f072 | 1318 | assign_ctxt_affinity(fp, dd); |
f931551b | 1319 | |
c804f072 RV |
1320 | numa_id = qib_numa_aware ? ((fd->rec_cpu_num != -1) ? |
1321 | cpu_to_node(fd->rec_cpu_num) : | |
1322 | numa_node_id()) : dd->assigned_node_id; | |
e0f30bac RV |
1323 | |
1324 | rcd = qib_create_ctxtdata(ppd, ctxt, numa_id); | |
f931551b RC |
1325 | |
1326 | /* | |
1327 | * Allocate memory for use in qib_tid_update() at open to | |
1328 | * reduce cost of expected send setup per message segment | |
1329 | */ | |
1330 | if (rcd) | |
1331 | ptmp = kmalloc(dd->rcvtidcnt * sizeof(u16) + | |
1332 | dd->rcvtidcnt * sizeof(struct page **), | |
1333 | GFP_KERNEL); | |
1334 | ||
1335 | if (!rcd || !ptmp) { | |
7fac3301 MM |
1336 | qib_dev_err(dd, |
1337 | "Unable to allocate ctxtdata memory, failing open\n"); | |
f931551b RC |
1338 | ret = -ENOMEM; |
1339 | goto bailerr; | |
1340 | } | |
1341 | rcd->userversion = uinfo->spu_userversion; | |
1342 | ret = init_subctxts(dd, rcd, uinfo); | |
1343 | if (ret) | |
1344 | goto bailerr; | |
1345 | rcd->tid_pg_list = ptmp; | |
1346 | rcd->pid = current->pid; | |
1347 | init_waitqueue_head(&dd->rcd[ctxt]->wait); | |
1348 | strlcpy(rcd->comm, current->comm, sizeof(rcd->comm)); | |
1349 | ctxt_fp(fp) = rcd; | |
1350 | qib_stats.sps_ctxts++; | |
29d1b161 | 1351 | dd->freectxts--; |
f931551b RC |
1352 | ret = 0; |
1353 | goto bail; | |
1354 | ||
1355 | bailerr: | |
c804f072 RV |
1356 | if (fd->rec_cpu_num != -1) |
1357 | __clear_bit(fd->rec_cpu_num, qib_cpulist); | |
1358 | ||
f931551b RC |
1359 | dd->rcd[ctxt] = NULL; |
1360 | kfree(rcd); | |
1361 | kfree(ptmp); | |
1362 | bail: | |
1363 | return ret; | |
1364 | } | |
1365 | ||
bdf8edcb | 1366 | static inline int usable(struct qib_pportdata *ppd) |
f931551b RC |
1367 | { |
1368 | struct qib_devdata *dd = ppd->dd; | |
f931551b RC |
1369 | |
1370 | return dd && (dd->flags & QIB_PRESENT) && dd->kregbase && ppd->lid && | |
bdf8edcb | 1371 | (ppd->lflags & QIBL_LINKACTIVE); |
f931551b RC |
1372 | } |
1373 | ||
bdf8edcb DO |
1374 | /* |
1375 | * Select a context on the given device, either using a requested port | |
1376 | * or the port based on the context number. | |
1377 | */ | |
1378 | static int choose_port_ctxt(struct file *fp, struct qib_devdata *dd, u32 port, | |
1379 | const struct qib_user_info *uinfo) | |
f931551b | 1380 | { |
f931551b | 1381 | struct qib_pportdata *ppd = NULL; |
bdf8edcb | 1382 | int ret, ctxt; |
f931551b | 1383 | |
bdf8edcb DO |
1384 | if (port) { |
1385 | if (!usable(dd->pport + port - 1)) { | |
f931551b | 1386 | ret = -ENETDOWN; |
bdf8edcb DO |
1387 | goto done; |
1388 | } else | |
1389 | ppd = dd->pport + port - 1; | |
f931551b | 1390 | } |
bdf8edcb DO |
1391 | for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts && dd->rcd[ctxt]; |
1392 | ctxt++) | |
1393 | ; | |
1394 | if (ctxt == dd->cfgctxts) { | |
1395 | ret = -EBUSY; | |
1396 | goto done; | |
1397 | } | |
1398 | if (!ppd) { | |
1399 | u32 pidx = ctxt % dd->num_pports; | |
da12c1f6 | 1400 | |
bdf8edcb DO |
1401 | if (usable(dd->pport + pidx)) |
1402 | ppd = dd->pport + pidx; | |
1403 | else { | |
1404 | for (pidx = 0; pidx < dd->num_pports && !ppd; | |
1405 | pidx++) | |
1406 | if (usable(dd->pport + pidx)) | |
1407 | ppd = dd->pport + pidx; | |
f931551b | 1408 | } |
f931551b | 1409 | } |
bdf8edcb DO |
1410 | ret = ppd ? setup_ctxt(ppd, ctxt, fp, uinfo) : -ENETDOWN; |
1411 | done: | |
1412 | return ret; | |
1413 | } | |
1414 | ||
1415 | static int find_free_ctxt(int unit, struct file *fp, | |
1416 | const struct qib_user_info *uinfo) | |
1417 | { | |
1418 | struct qib_devdata *dd = qib_lookup(unit); | |
1419 | int ret; | |
1420 | ||
1421 | if (!dd || (uinfo->spu_port && uinfo->spu_port > dd->num_pports)) | |
1422 | ret = -ENODEV; | |
1423 | else | |
1424 | ret = choose_port_ctxt(fp, dd, uinfo->spu_port, uinfo); | |
f931551b | 1425 | |
f931551b RC |
1426 | return ret; |
1427 | } | |
1428 | ||
bdf8edcb DO |
1429 | static int get_a_ctxt(struct file *fp, const struct qib_user_info *uinfo, |
1430 | unsigned alg) | |
f931551b | 1431 | { |
bdf8edcb DO |
1432 | struct qib_devdata *udd = NULL; |
1433 | int ret = 0, devmax, npresent, nup, ndev, dusable = 0, i; | |
f931551b RC |
1434 | u32 port = uinfo->spu_port, ctxt; |
1435 | ||
1436 | devmax = qib_count_units(&npresent, &nup); | |
bdf8edcb DO |
1437 | if (!npresent) { |
1438 | ret = -ENXIO; | |
1439 | goto done; | |
1440 | } | |
1441 | if (nup == 0) { | |
1442 | ret = -ENETDOWN; | |
1443 | goto done; | |
1444 | } | |
f931551b | 1445 | |
bdf8edcb DO |
1446 | if (alg == QIB_PORT_ALG_ACROSS) { |
1447 | unsigned inuse = ~0U; | |
da12c1f6 | 1448 | |
bdf8edcb DO |
1449 | /* find device (with ACTIVE ports) with fewest ctxts in use */ |
1450 | for (ndev = 0; ndev < devmax; ndev++) { | |
1451 | struct qib_devdata *dd = qib_lookup(ndev); | |
6676b3f7 | 1452 | unsigned cused = 0, cfree = 0, pusable = 0; |
da12c1f6 | 1453 | |
bdf8edcb | 1454 | if (!dd) |
f931551b | 1455 | continue; |
bdf8edcb DO |
1456 | if (port && port <= dd->num_pports && |
1457 | usable(dd->pport + port - 1)) | |
6676b3f7 | 1458 | pusable = 1; |
bdf8edcb DO |
1459 | else |
1460 | for (i = 0; i < dd->num_pports; i++) | |
1461 | if (usable(dd->pport + i)) | |
6676b3f7 MM |
1462 | pusable++; |
1463 | if (!pusable) | |
bdf8edcb DO |
1464 | continue; |
1465 | for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts; | |
1466 | ctxt++) | |
1467 | if (dd->rcd[ctxt]) | |
1468 | cused++; | |
1469 | else | |
1470 | cfree++; | |
db498827 | 1471 | if (cfree && cused < inuse) { |
bdf8edcb DO |
1472 | udd = dd; |
1473 | inuse = cused; | |
f931551b | 1474 | } |
bdf8edcb DO |
1475 | } |
1476 | if (udd) { | |
1477 | ret = choose_port_ctxt(fp, udd, port, uinfo); | |
f931551b RC |
1478 | goto done; |
1479 | } | |
bdf8edcb DO |
1480 | } else { |
1481 | for (ndev = 0; ndev < devmax; ndev++) { | |
1482 | struct qib_devdata *dd = qib_lookup(ndev); | |
da12c1f6 | 1483 | |
bdf8edcb DO |
1484 | if (dd) { |
1485 | ret = choose_port_ctxt(fp, dd, port, uinfo); | |
1486 | if (!ret) | |
1487 | goto done; | |
1488 | if (ret == -EBUSY) | |
1489 | dusable++; | |
1490 | } | |
1491 | } | |
f931551b | 1492 | } |
bdf8edcb | 1493 | ret = dusable ? -EBUSY : -ENETDOWN; |
f931551b RC |
1494 | |
1495 | done: | |
1496 | return ret; | |
1497 | } | |
1498 | ||
1499 | static int find_shared_ctxt(struct file *fp, | |
1500 | const struct qib_user_info *uinfo) | |
1501 | { | |
1502 | int devmax, ndev, i; | |
1503 | int ret = 0; | |
1504 | ||
1505 | devmax = qib_count_units(NULL, NULL); | |
1506 | ||
1507 | for (ndev = 0; ndev < devmax; ndev++) { | |
1508 | struct qib_devdata *dd = qib_lookup(ndev); | |
1509 | ||
1510 | /* device portion of usable() */ | |
1511 | if (!(dd && (dd->flags & QIB_PRESENT) && dd->kregbase)) | |
1512 | continue; | |
1513 | for (i = dd->first_user_ctxt; i < dd->cfgctxts; i++) { | |
1514 | struct qib_ctxtdata *rcd = dd->rcd[i]; | |
1515 | ||
1516 | /* Skip ctxts which are not yet open */ | |
1517 | if (!rcd || !rcd->cnt) | |
1518 | continue; | |
1519 | /* Skip ctxt if it doesn't match the requested one */ | |
1520 | if (rcd->subctxt_id != uinfo->spu_subctxt_id) | |
1521 | continue; | |
1522 | /* Verify the sharing process matches the master */ | |
1523 | if (rcd->subctxt_cnt != uinfo->spu_subctxt_cnt || | |
1524 | rcd->userversion != uinfo->spu_userversion || | |
1525 | rcd->cnt >= rcd->subctxt_cnt) { | |
1526 | ret = -EINVAL; | |
1527 | goto done; | |
1528 | } | |
1529 | ctxt_fp(fp) = rcd; | |
1530 | subctxt_fp(fp) = rcd->cnt++; | |
1531 | rcd->subpid[subctxt_fp(fp)] = current->pid; | |
1532 | tidcursor_fp(fp) = 0; | |
1533 | rcd->active_slaves |= 1 << subctxt_fp(fp); | |
1534 | ret = 1; | |
1535 | goto done; | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | done: | |
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | static int qib_open(struct inode *in, struct file *fp) | |
1544 | { | |
1545 | /* The real work is performed later in qib_assign_ctxt() */ | |
1546 | fp->private_data = kzalloc(sizeof(struct qib_filedata), GFP_KERNEL); | |
1547 | if (fp->private_data) /* no cpu affinity by default */ | |
1548 | ((struct qib_filedata *)fp->private_data)->rec_cpu_num = -1; | |
1549 | return fp->private_data ? 0 : -ENOMEM; | |
1550 | } | |
1551 | ||
c804f072 RV |
1552 | static int find_hca(unsigned int cpu, int *unit) |
1553 | { | |
1554 | int ret = 0, devmax, npresent, nup, ndev; | |
1555 | ||
1556 | *unit = -1; | |
1557 | ||
1558 | devmax = qib_count_units(&npresent, &nup); | |
1559 | if (!npresent) { | |
1560 | ret = -ENXIO; | |
1561 | goto done; | |
1562 | } | |
1563 | if (!nup) { | |
1564 | ret = -ENETDOWN; | |
1565 | goto done; | |
1566 | } | |
1567 | for (ndev = 0; ndev < devmax; ndev++) { | |
1568 | struct qib_devdata *dd = qib_lookup(ndev); | |
da12c1f6 | 1569 | |
c804f072 RV |
1570 | if (dd) { |
1571 | if (pcibus_to_node(dd->pcidev->bus) < 0) { | |
1572 | ret = -EINVAL; | |
1573 | goto done; | |
1574 | } | |
1575 | if (cpu_to_node(cpu) == | |
1576 | pcibus_to_node(dd->pcidev->bus)) { | |
1577 | *unit = ndev; | |
1578 | goto done; | |
1579 | } | |
1580 | } | |
1581 | } | |
1582 | done: | |
1583 | return ret; | |
1584 | } | |
1585 | ||
1586 | static int do_qib_user_sdma_queue_create(struct file *fp) | |
1587 | { | |
1588 | struct qib_filedata *fd = fp->private_data; | |
1589 | struct qib_ctxtdata *rcd = fd->rcd; | |
1590 | struct qib_devdata *dd = rcd->dd; | |
1591 | ||
37a96765 | 1592 | if (dd->flags & QIB_HAS_SEND_DMA) { |
c804f072 RV |
1593 | |
1594 | fd->pq = qib_user_sdma_queue_create(&dd->pcidev->dev, | |
1595 | dd->unit, | |
1596 | rcd->ctxt, | |
1597 | fd->subctxt); | |
1598 | if (!fd->pq) | |
1599 | return -ENOMEM; | |
37a96765 | 1600 | } |
c804f072 RV |
1601 | |
1602 | return 0; | |
1603 | } | |
1604 | ||
f931551b RC |
1605 | /* |
1606 | * Get ctxt early, so can set affinity prior to memory allocation. | |
1607 | */ | |
1608 | static int qib_assign_ctxt(struct file *fp, const struct qib_user_info *uinfo) | |
1609 | { | |
1610 | int ret; | |
1611 | int i_minor; | |
bdf8edcb | 1612 | unsigned swmajor, swminor, alg = QIB_PORT_ALG_ACROSS; |
f931551b RC |
1613 | |
1614 | /* Check to be sure we haven't already initialized this file */ | |
1615 | if (ctxt_fp(fp)) { | |
1616 | ret = -EINVAL; | |
1617 | goto done; | |
1618 | } | |
1619 | ||
1620 | /* for now, if major version is different, bail */ | |
1621 | swmajor = uinfo->spu_userversion >> 16; | |
1622 | if (swmajor != QIB_USER_SWMAJOR) { | |
1623 | ret = -ENODEV; | |
1624 | goto done; | |
1625 | } | |
1626 | ||
1627 | swminor = uinfo->spu_userversion & 0xffff; | |
1628 | ||
bdf8edcb DO |
1629 | if (swminor >= 11 && uinfo->spu_port_alg < QIB_PORT_ALG_COUNT) |
1630 | alg = uinfo->spu_port_alg; | |
1631 | ||
f931551b RC |
1632 | mutex_lock(&qib_mutex); |
1633 | ||
1634 | if (qib_compatible_subctxts(swmajor, swminor) && | |
1635 | uinfo->spu_subctxt_cnt) { | |
1636 | ret = find_shared_ctxt(fp, uinfo); | |
c804f072 RV |
1637 | if (ret > 0) { |
1638 | ret = do_qib_user_sdma_queue_create(fp); | |
1639 | if (!ret) | |
1640 | assign_ctxt_affinity(fp, (ctxt_fp(fp))->dd); | |
1641 | goto done_ok; | |
f931551b RC |
1642 | } |
1643 | } | |
1644 | ||
496ad9aa | 1645 | i_minor = iminor(file_inode(fp)) - QIB_USER_MINOR_BASE; |
f931551b RC |
1646 | if (i_minor) |
1647 | ret = find_free_ctxt(i_minor - 1, fp, uinfo); | |
c804f072 RV |
1648 | else { |
1649 | int unit; | |
1650 | const unsigned int cpu = cpumask_first(¤t->cpus_allowed); | |
1651 | const unsigned int weight = | |
1652 | cpumask_weight(¤t->cpus_allowed); | |
1653 | ||
1654 | if (weight == 1 && !test_bit(cpu, qib_cpulist)) | |
1655 | if (!find_hca(cpu, &unit) && unit >= 0) | |
1656 | if (!find_free_ctxt(unit, fp, uinfo)) { | |
1657 | ret = 0; | |
1658 | goto done_chk_sdma; | |
1659 | } | |
bdf8edcb | 1660 | ret = get_a_ctxt(fp, uinfo, alg); |
f931551b RC |
1661 | } |
1662 | ||
c804f072 RV |
1663 | done_chk_sdma: |
1664 | if (!ret) | |
1665 | ret = do_qib_user_sdma_queue_create(fp); | |
1666 | done_ok: | |
f931551b RC |
1667 | mutex_unlock(&qib_mutex); |
1668 | ||
1669 | done: | |
1670 | return ret; | |
1671 | } | |
1672 | ||
1673 | ||
1674 | static int qib_do_user_init(struct file *fp, | |
1675 | const struct qib_user_info *uinfo) | |
1676 | { | |
1677 | int ret; | |
1678 | struct qib_ctxtdata *rcd = ctxt_fp(fp); | |
1679 | struct qib_devdata *dd; | |
1680 | unsigned uctxt; | |
1681 | ||
1682 | /* Subctxts don't need to initialize anything since master did it. */ | |
1683 | if (subctxt_fp(fp)) { | |
1684 | ret = wait_event_interruptible(rcd->wait, | |
1685 | !test_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag)); | |
1686 | goto bail; | |
1687 | } | |
1688 | ||
1689 | dd = rcd->dd; | |
1690 | ||
1691 | /* some ctxts may get extra buffers, calculate that here */ | |
1692 | uctxt = rcd->ctxt - dd->first_user_ctxt; | |
1693 | if (uctxt < dd->ctxts_extrabuf) { | |
1694 | rcd->piocnt = dd->pbufsctxt + 1; | |
1695 | rcd->pio_base = rcd->piocnt * uctxt; | |
1696 | } else { | |
1697 | rcd->piocnt = dd->pbufsctxt; | |
1698 | rcd->pio_base = rcd->piocnt * uctxt + | |
1699 | dd->ctxts_extrabuf; | |
1700 | } | |
1701 | ||
1702 | /* | |
1703 | * All user buffers are 2KB buffers. If we ever support | |
1704 | * giving 4KB buffers to user processes, this will need some | |
1705 | * work. Can't use piobufbase directly, because it has | |
1706 | * both 2K and 4K buffer base values. So check and handle. | |
1707 | */ | |
1708 | if ((rcd->pio_base + rcd->piocnt) > dd->piobcnt2k) { | |
1709 | if (rcd->pio_base >= dd->piobcnt2k) { | |
1710 | qib_dev_err(dd, | |
1711 | "%u:ctxt%u: no 2KB buffers available\n", | |
1712 | dd->unit, rcd->ctxt); | |
1713 | ret = -ENOBUFS; | |
1714 | goto bail; | |
1715 | } | |
1716 | rcd->piocnt = dd->piobcnt2k - rcd->pio_base; | |
1717 | qib_dev_err(dd, "Ctxt%u: would use 4KB bufs, using %u\n", | |
1718 | rcd->ctxt, rcd->piocnt); | |
1719 | } | |
1720 | ||
1721 | rcd->piobufs = dd->pio2k_bufbase + rcd->pio_base * dd->palign; | |
1722 | qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt, | |
1723 | TXCHK_CHG_TYPE_USER, rcd); | |
1724 | /* | |
1725 | * try to ensure that processes start up with consistent avail update | |
1726 | * for their own range, at least. If system very quiet, it might | |
1727 | * have the in-memory copy out of date at startup for this range of | |
1728 | * buffers, when a context gets re-used. Do after the chg_pioavail | |
1729 | * and before the rest of setup, so it's "almost certain" the dma | |
1730 | * will have occurred (can't 100% guarantee, but should be many | |
1731 | * decimals of 9s, with this ordering), given how much else happens | |
1732 | * after this. | |
1733 | */ | |
1734 | dd->f_sendctrl(dd->pport, QIB_SENDCTRL_AVAIL_BLIP); | |
1735 | ||
1736 | /* | |
1737 | * Now allocate the rcvhdr Q and eager TIDs; skip the TID | |
1738 | * array for time being. If rcd->ctxt > chip-supported, | |
1739 | * we need to do extra stuff here to handle by handling overflow | |
1740 | * through ctxt 0, someday | |
1741 | */ | |
1742 | ret = qib_create_rcvhdrq(dd, rcd); | |
1743 | if (!ret) | |
1744 | ret = qib_setup_eagerbufs(rcd); | |
1745 | if (ret) | |
1746 | goto bail_pio; | |
1747 | ||
1748 | rcd->tidcursor = 0; /* start at beginning after open */ | |
1749 | ||
1750 | /* initialize poll variables... */ | |
1751 | rcd->urgent = 0; | |
1752 | rcd->urgent_poll = 0; | |
1753 | ||
1754 | /* | |
1755 | * Now enable the ctxt for receive. | |
1756 | * For chips that are set to DMA the tail register to memory | |
1757 | * when they change (and when the update bit transitions from | |
1758 | * 0 to 1. So for those chips, we turn it off and then back on. | |
1759 | * This will (very briefly) affect any other open ctxts, but the | |
1760 | * duration is very short, and therefore isn't an issue. We | |
25985edc | 1761 | * explicitly set the in-memory tail copy to 0 beforehand, so we |
f931551b RC |
1762 | * don't have to wait to be sure the DMA update has happened |
1763 | * (chip resets head/tail to 0 on transition to enable). | |
1764 | */ | |
1765 | if (rcd->rcvhdrtail_kvaddr) | |
1766 | qib_clear_rcvhdrtail(rcd); | |
1767 | ||
1768 | dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_ENB | QIB_RCVCTRL_TIDFLOW_ENB, | |
1769 | rcd->ctxt); | |
1770 | ||
1771 | /* Notify any waiting slaves */ | |
1772 | if (rcd->subctxt_cnt) { | |
1773 | clear_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag); | |
1774 | wake_up(&rcd->wait); | |
1775 | } | |
1776 | return 0; | |
1777 | ||
1778 | bail_pio: | |
1779 | qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt, | |
1780 | TXCHK_CHG_TYPE_KERN, rcd); | |
1781 | bail: | |
1782 | return ret; | |
1783 | } | |
1784 | ||
1785 | /** | |
1786 | * unlock_exptid - unlock any expected TID entries context still had in use | |
1787 | * @rcd: ctxt | |
1788 | * | |
1789 | * We don't actually update the chip here, because we do a bulk update | |
1790 | * below, using f_clear_tids. | |
1791 | */ | |
1792 | static void unlock_expected_tids(struct qib_ctxtdata *rcd) | |
1793 | { | |
1794 | struct qib_devdata *dd = rcd->dd; | |
1795 | int ctxt_tidbase = rcd->ctxt * dd->rcvtidcnt; | |
1796 | int i, cnt = 0, maxtid = ctxt_tidbase + dd->rcvtidcnt; | |
1797 | ||
1798 | for (i = ctxt_tidbase; i < maxtid; i++) { | |
1799 | struct page *p = dd->pageshadow[i]; | |
1800 | dma_addr_t phys; | |
1801 | ||
1802 | if (!p) | |
1803 | continue; | |
1804 | ||
1805 | phys = dd->physshadow[i]; | |
1806 | dd->physshadow[i] = dd->tidinvalid; | |
1807 | dd->pageshadow[i] = NULL; | |
1808 | pci_unmap_page(dd->pcidev, phys, PAGE_SIZE, | |
1809 | PCI_DMA_FROMDEVICE); | |
1810 | qib_release_user_pages(&p, 1); | |
1811 | cnt++; | |
1812 | } | |
1813 | } | |
1814 | ||
1815 | static int qib_close(struct inode *in, struct file *fp) | |
1816 | { | |
1817 | int ret = 0; | |
1818 | struct qib_filedata *fd; | |
1819 | struct qib_ctxtdata *rcd; | |
1820 | struct qib_devdata *dd; | |
1821 | unsigned long flags; | |
1822 | unsigned ctxt; | |
1823 | pid_t pid; | |
1824 | ||
1825 | mutex_lock(&qib_mutex); | |
1826 | ||
ea3f0e6b | 1827 | fd = fp->private_data; |
f931551b RC |
1828 | fp->private_data = NULL; |
1829 | rcd = fd->rcd; | |
1830 | if (!rcd) { | |
1831 | mutex_unlock(&qib_mutex); | |
1832 | goto bail; | |
1833 | } | |
1834 | ||
1835 | dd = rcd->dd; | |
1836 | ||
1837 | /* ensure all pio buffer writes in progress are flushed */ | |
1838 | qib_flush_wc(); | |
1839 | ||
1840 | /* drain user sdma queue */ | |
1841 | if (fd->pq) { | |
1842 | qib_user_sdma_queue_drain(rcd->ppd, fd->pq); | |
1843 | qib_user_sdma_queue_destroy(fd->pq); | |
1844 | } | |
1845 | ||
1846 | if (fd->rec_cpu_num != -1) | |
1847 | __clear_bit(fd->rec_cpu_num, qib_cpulist); | |
1848 | ||
1849 | if (--rcd->cnt) { | |
1850 | /* | |
1851 | * XXX If the master closes the context before the slave(s), | |
1852 | * revoke the mmap for the eager receive queue so | |
1853 | * the slave(s) don't wait for receive data forever. | |
1854 | */ | |
1855 | rcd->active_slaves &= ~(1 << fd->subctxt); | |
1856 | rcd->subpid[fd->subctxt] = 0; | |
1857 | mutex_unlock(&qib_mutex); | |
1858 | goto bail; | |
1859 | } | |
1860 | ||
1861 | /* early; no interrupt users after this */ | |
1862 | spin_lock_irqsave(&dd->uctxt_lock, flags); | |
1863 | ctxt = rcd->ctxt; | |
1864 | dd->rcd[ctxt] = NULL; | |
1865 | pid = rcd->pid; | |
1866 | rcd->pid = 0; | |
1867 | spin_unlock_irqrestore(&dd->uctxt_lock, flags); | |
1868 | ||
1869 | if (rcd->rcvwait_to || rcd->piowait_to || | |
1870 | rcd->rcvnowait || rcd->pionowait) { | |
1871 | rcd->rcvwait_to = 0; | |
1872 | rcd->piowait_to = 0; | |
1873 | rcd->rcvnowait = 0; | |
1874 | rcd->pionowait = 0; | |
1875 | } | |
1876 | if (rcd->flag) | |
1877 | rcd->flag = 0; | |
1878 | ||
1879 | if (dd->kregbase) { | |
1880 | /* atomically clear receive enable ctxt and intr avail. */ | |
1881 | dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_DIS | | |
1882 | QIB_RCVCTRL_INTRAVAIL_DIS, ctxt); | |
1883 | ||
1884 | /* clean up the pkeys for this ctxt user */ | |
1885 | qib_clean_part_key(rcd, dd); | |
1886 | qib_disarm_piobufs(dd, rcd->pio_base, rcd->piocnt); | |
1887 | qib_chg_pioavailkernel(dd, rcd->pio_base, | |
1888 | rcd->piocnt, TXCHK_CHG_TYPE_KERN, NULL); | |
1889 | ||
1890 | dd->f_clear_tids(dd, rcd); | |
1891 | ||
1892 | if (dd->pageshadow) | |
1893 | unlock_expected_tids(rcd); | |
1894 | qib_stats.sps_ctxts--; | |
29d1b161 | 1895 | dd->freectxts++; |
f931551b RC |
1896 | } |
1897 | ||
1898 | mutex_unlock(&qib_mutex); | |
1899 | qib_free_ctxtdata(dd, rcd); /* after releasing the mutex */ | |
1900 | ||
1901 | bail: | |
1902 | kfree(fd); | |
1903 | return ret; | |
1904 | } | |
1905 | ||
1906 | static int qib_ctxt_info(struct file *fp, struct qib_ctxt_info __user *uinfo) | |
1907 | { | |
1908 | struct qib_ctxt_info info; | |
1909 | int ret; | |
1910 | size_t sz; | |
1911 | struct qib_ctxtdata *rcd = ctxt_fp(fp); | |
1912 | struct qib_filedata *fd; | |
1913 | ||
ea3f0e6b | 1914 | fd = fp->private_data; |
f931551b RC |
1915 | |
1916 | info.num_active = qib_count_active_units(); | |
1917 | info.unit = rcd->dd->unit; | |
1918 | info.port = rcd->ppd->port; | |
1919 | info.ctxt = rcd->ctxt; | |
1920 | info.subctxt = subctxt_fp(fp); | |
1921 | /* Number of user ctxts available for this device. */ | |
1922 | info.num_ctxts = rcd->dd->cfgctxts - rcd->dd->first_user_ctxt; | |
1923 | info.num_subctxts = rcd->subctxt_cnt; | |
1924 | info.rec_cpu = fd->rec_cpu_num; | |
1925 | sz = sizeof(info); | |
1926 | ||
1927 | if (copy_to_user(uinfo, &info, sz)) { | |
1928 | ret = -EFAULT; | |
1929 | goto bail; | |
1930 | } | |
1931 | ret = 0; | |
1932 | ||
1933 | bail: | |
1934 | return ret; | |
1935 | } | |
1936 | ||
1937 | static int qib_sdma_get_inflight(struct qib_user_sdma_queue *pq, | |
1938 | u32 __user *inflightp) | |
1939 | { | |
1940 | const u32 val = qib_user_sdma_inflight_counter(pq); | |
1941 | ||
1942 | if (put_user(val, inflightp)) | |
1943 | return -EFAULT; | |
1944 | ||
1945 | return 0; | |
1946 | } | |
1947 | ||
1948 | static int qib_sdma_get_complete(struct qib_pportdata *ppd, | |
1949 | struct qib_user_sdma_queue *pq, | |
1950 | u32 __user *completep) | |
1951 | { | |
1952 | u32 val; | |
1953 | int err; | |
1954 | ||
1955 | if (!pq) | |
1956 | return -EINVAL; | |
1957 | ||
1958 | err = qib_user_sdma_make_progress(ppd, pq); | |
1959 | if (err < 0) | |
1960 | return err; | |
1961 | ||
1962 | val = qib_user_sdma_complete_counter(pq); | |
1963 | if (put_user(val, completep)) | |
1964 | return -EFAULT; | |
1965 | ||
1966 | return 0; | |
1967 | } | |
1968 | ||
1969 | static int disarm_req_delay(struct qib_ctxtdata *rcd) | |
1970 | { | |
1971 | int ret = 0; | |
1972 | ||
bdf8edcb | 1973 | if (!usable(rcd->ppd)) { |
f931551b RC |
1974 | int i; |
1975 | /* | |
1976 | * if link is down, or otherwise not usable, delay | |
1977 | * the caller up to 30 seconds, so we don't thrash | |
1978 | * in trying to get the chip back to ACTIVE, and | |
1979 | * set flag so they make the call again. | |
1980 | */ | |
1981 | if (rcd->user_event_mask) { | |
1982 | /* | |
1983 | * subctxt_cnt is 0 if not shared, so do base | |
1984 | * separately, first, then remaining subctxt, if any | |
1985 | */ | |
1986 | set_bit(_QIB_EVENT_DISARM_BUFS_BIT, | |
1987 | &rcd->user_event_mask[0]); | |
1988 | for (i = 1; i < rcd->subctxt_cnt; i++) | |
1989 | set_bit(_QIB_EVENT_DISARM_BUFS_BIT, | |
1990 | &rcd->user_event_mask[i]); | |
1991 | } | |
bdf8edcb | 1992 | for (i = 0; !usable(rcd->ppd) && i < 300; i++) |
f931551b RC |
1993 | msleep(100); |
1994 | ret = -ENETDOWN; | |
1995 | } | |
1996 | return ret; | |
1997 | } | |
1998 | ||
1999 | /* | |
2000 | * Find all user contexts in use, and set the specified bit in their | |
2001 | * event mask. | |
2002 | * See also find_ctxt() for a similar use, that is specific to send buffers. | |
2003 | */ | |
2004 | int qib_set_uevent_bits(struct qib_pportdata *ppd, const int evtbit) | |
2005 | { | |
2006 | struct qib_ctxtdata *rcd; | |
2007 | unsigned ctxt; | |
2008 | int ret = 0; | |
4356d0b6 | 2009 | unsigned long flags; |
f931551b | 2010 | |
4356d0b6 | 2011 | spin_lock_irqsave(&ppd->dd->uctxt_lock, flags); |
f931551b RC |
2012 | for (ctxt = ppd->dd->first_user_ctxt; ctxt < ppd->dd->cfgctxts; |
2013 | ctxt++) { | |
2014 | rcd = ppd->dd->rcd[ctxt]; | |
2015 | if (!rcd) | |
2016 | continue; | |
2017 | if (rcd->user_event_mask) { | |
2018 | int i; | |
2019 | /* | |
2020 | * subctxt_cnt is 0 if not shared, so do base | |
2021 | * separately, first, then remaining subctxt, if any | |
2022 | */ | |
2023 | set_bit(evtbit, &rcd->user_event_mask[0]); | |
2024 | for (i = 1; i < rcd->subctxt_cnt; i++) | |
2025 | set_bit(evtbit, &rcd->user_event_mask[i]); | |
2026 | } | |
2027 | ret = 1; | |
2028 | break; | |
2029 | } | |
4356d0b6 | 2030 | spin_unlock_irqrestore(&ppd->dd->uctxt_lock, flags); |
f931551b RC |
2031 | |
2032 | return ret; | |
2033 | } | |
2034 | ||
2035 | /* | |
2036 | * clear the event notifier events for this context. | |
2037 | * For the DISARM_BUFS case, we also take action (this obsoletes | |
2038 | * the older QIB_CMD_DISARM_BUFS, but we keep it for backwards | |
2039 | * compatibility. | |
2040 | * Other bits don't currently require actions, just atomically clear. | |
2041 | * User process then performs actions appropriate to bit having been | |
2042 | * set, if desired, and checks again in future. | |
2043 | */ | |
2044 | static int qib_user_event_ack(struct qib_ctxtdata *rcd, int subctxt, | |
2045 | unsigned long events) | |
2046 | { | |
2047 | int ret = 0, i; | |
2048 | ||
2049 | for (i = 0; i <= _QIB_MAX_EVENT_BIT; i++) { | |
2050 | if (!test_bit(i, &events)) | |
2051 | continue; | |
2052 | if (i == _QIB_EVENT_DISARM_BUFS_BIT) { | |
2053 | (void)qib_disarm_piobufs_ifneeded(rcd); | |
2054 | ret = disarm_req_delay(rcd); | |
2055 | } else | |
2056 | clear_bit(i, &rcd->user_event_mask[subctxt]); | |
2057 | } | |
2058 | return ret; | |
2059 | } | |
2060 | ||
2061 | static ssize_t qib_write(struct file *fp, const char __user *data, | |
2062 | size_t count, loff_t *off) | |
2063 | { | |
2064 | const struct qib_cmd __user *ucmd; | |
2065 | struct qib_ctxtdata *rcd; | |
2066 | const void __user *src; | |
2067 | size_t consumed, copy = 0; | |
2068 | struct qib_cmd cmd; | |
2069 | ssize_t ret = 0; | |
2070 | void *dest; | |
2071 | ||
e6bd18f5 JG |
2072 | if (WARN_ON_ONCE(!ib_safe_file_access(fp))) |
2073 | return -EACCES; | |
2074 | ||
f931551b RC |
2075 | if (count < sizeof(cmd.type)) { |
2076 | ret = -EINVAL; | |
2077 | goto bail; | |
2078 | } | |
2079 | ||
2080 | ucmd = (const struct qib_cmd __user *) data; | |
2081 | ||
2082 | if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) { | |
2083 | ret = -EFAULT; | |
2084 | goto bail; | |
2085 | } | |
2086 | ||
2087 | consumed = sizeof(cmd.type); | |
2088 | ||
2089 | switch (cmd.type) { | |
2090 | case QIB_CMD_ASSIGN_CTXT: | |
2091 | case QIB_CMD_USER_INIT: | |
2092 | copy = sizeof(cmd.cmd.user_info); | |
2093 | dest = &cmd.cmd.user_info; | |
2094 | src = &ucmd->cmd.user_info; | |
2095 | break; | |
2096 | ||
2097 | case QIB_CMD_RECV_CTRL: | |
2098 | copy = sizeof(cmd.cmd.recv_ctrl); | |
2099 | dest = &cmd.cmd.recv_ctrl; | |
2100 | src = &ucmd->cmd.recv_ctrl; | |
2101 | break; | |
2102 | ||
2103 | case QIB_CMD_CTXT_INFO: | |
2104 | copy = sizeof(cmd.cmd.ctxt_info); | |
2105 | dest = &cmd.cmd.ctxt_info; | |
2106 | src = &ucmd->cmd.ctxt_info; | |
2107 | break; | |
2108 | ||
2109 | case QIB_CMD_TID_UPDATE: | |
2110 | case QIB_CMD_TID_FREE: | |
2111 | copy = sizeof(cmd.cmd.tid_info); | |
2112 | dest = &cmd.cmd.tid_info; | |
2113 | src = &ucmd->cmd.tid_info; | |
2114 | break; | |
2115 | ||
2116 | case QIB_CMD_SET_PART_KEY: | |
2117 | copy = sizeof(cmd.cmd.part_key); | |
2118 | dest = &cmd.cmd.part_key; | |
2119 | src = &ucmd->cmd.part_key; | |
2120 | break; | |
2121 | ||
2122 | case QIB_CMD_DISARM_BUFS: | |
2123 | case QIB_CMD_PIOAVAILUPD: /* force an update of PIOAvail reg */ | |
2124 | copy = 0; | |
2125 | src = NULL; | |
2126 | dest = NULL; | |
2127 | break; | |
2128 | ||
2129 | case QIB_CMD_POLL_TYPE: | |
2130 | copy = sizeof(cmd.cmd.poll_type); | |
2131 | dest = &cmd.cmd.poll_type; | |
2132 | src = &ucmd->cmd.poll_type; | |
2133 | break; | |
2134 | ||
2135 | case QIB_CMD_ARMLAUNCH_CTRL: | |
2136 | copy = sizeof(cmd.cmd.armlaunch_ctrl); | |
2137 | dest = &cmd.cmd.armlaunch_ctrl; | |
2138 | src = &ucmd->cmd.armlaunch_ctrl; | |
2139 | break; | |
2140 | ||
2141 | case QIB_CMD_SDMA_INFLIGHT: | |
2142 | copy = sizeof(cmd.cmd.sdma_inflight); | |
2143 | dest = &cmd.cmd.sdma_inflight; | |
2144 | src = &ucmd->cmd.sdma_inflight; | |
2145 | break; | |
2146 | ||
2147 | case QIB_CMD_SDMA_COMPLETE: | |
2148 | copy = sizeof(cmd.cmd.sdma_complete); | |
2149 | dest = &cmd.cmd.sdma_complete; | |
2150 | src = &ucmd->cmd.sdma_complete; | |
2151 | break; | |
2152 | ||
2153 | case QIB_CMD_ACK_EVENT: | |
2154 | copy = sizeof(cmd.cmd.event_mask); | |
2155 | dest = &cmd.cmd.event_mask; | |
2156 | src = &ucmd->cmd.event_mask; | |
2157 | break; | |
2158 | ||
2159 | default: | |
2160 | ret = -EINVAL; | |
2161 | goto bail; | |
2162 | } | |
2163 | ||
2164 | if (copy) { | |
2165 | if ((count - consumed) < copy) { | |
2166 | ret = -EINVAL; | |
2167 | goto bail; | |
2168 | } | |
2169 | if (copy_from_user(dest, src, copy)) { | |
2170 | ret = -EFAULT; | |
2171 | goto bail; | |
2172 | } | |
2173 | consumed += copy; | |
2174 | } | |
2175 | ||
2176 | rcd = ctxt_fp(fp); | |
2177 | if (!rcd && cmd.type != QIB_CMD_ASSIGN_CTXT) { | |
2178 | ret = -EINVAL; | |
2179 | goto bail; | |
2180 | } | |
2181 | ||
2182 | switch (cmd.type) { | |
2183 | case QIB_CMD_ASSIGN_CTXT: | |
2184 | ret = qib_assign_ctxt(fp, &cmd.cmd.user_info); | |
2185 | if (ret) | |
2186 | goto bail; | |
2187 | break; | |
2188 | ||
2189 | case QIB_CMD_USER_INIT: | |
2190 | ret = qib_do_user_init(fp, &cmd.cmd.user_info); | |
2191 | if (ret) | |
2192 | goto bail; | |
2193 | ret = qib_get_base_info(fp, (void __user *) (unsigned long) | |
2194 | cmd.cmd.user_info.spu_base_info, | |
2195 | cmd.cmd.user_info.spu_base_info_size); | |
2196 | break; | |
2197 | ||
2198 | case QIB_CMD_RECV_CTRL: | |
2199 | ret = qib_manage_rcvq(rcd, subctxt_fp(fp), cmd.cmd.recv_ctrl); | |
2200 | break; | |
2201 | ||
2202 | case QIB_CMD_CTXT_INFO: | |
2203 | ret = qib_ctxt_info(fp, (struct qib_ctxt_info __user *) | |
2204 | (unsigned long) cmd.cmd.ctxt_info); | |
2205 | break; | |
2206 | ||
2207 | case QIB_CMD_TID_UPDATE: | |
2208 | ret = qib_tid_update(rcd, fp, &cmd.cmd.tid_info); | |
2209 | break; | |
2210 | ||
2211 | case QIB_CMD_TID_FREE: | |
2212 | ret = qib_tid_free(rcd, subctxt_fp(fp), &cmd.cmd.tid_info); | |
2213 | break; | |
2214 | ||
2215 | case QIB_CMD_SET_PART_KEY: | |
2216 | ret = qib_set_part_key(rcd, cmd.cmd.part_key); | |
2217 | break; | |
2218 | ||
2219 | case QIB_CMD_DISARM_BUFS: | |
2220 | (void)qib_disarm_piobufs_ifneeded(rcd); | |
2221 | ret = disarm_req_delay(rcd); | |
2222 | break; | |
2223 | ||
2224 | case QIB_CMD_PIOAVAILUPD: | |
2225 | qib_force_pio_avail_update(rcd->dd); | |
2226 | break; | |
2227 | ||
2228 | case QIB_CMD_POLL_TYPE: | |
2229 | rcd->poll_type = cmd.cmd.poll_type; | |
2230 | break; | |
2231 | ||
2232 | case QIB_CMD_ARMLAUNCH_CTRL: | |
2233 | rcd->dd->f_set_armlaunch(rcd->dd, cmd.cmd.armlaunch_ctrl); | |
2234 | break; | |
2235 | ||
2236 | case QIB_CMD_SDMA_INFLIGHT: | |
2237 | ret = qib_sdma_get_inflight(user_sdma_queue_fp(fp), | |
2238 | (u32 __user *) (unsigned long) | |
2239 | cmd.cmd.sdma_inflight); | |
2240 | break; | |
2241 | ||
2242 | case QIB_CMD_SDMA_COMPLETE: | |
2243 | ret = qib_sdma_get_complete(rcd->ppd, | |
2244 | user_sdma_queue_fp(fp), | |
2245 | (u32 __user *) (unsigned long) | |
2246 | cmd.cmd.sdma_complete); | |
2247 | break; | |
2248 | ||
2249 | case QIB_CMD_ACK_EVENT: | |
2250 | ret = qib_user_event_ack(rcd, subctxt_fp(fp), | |
2251 | cmd.cmd.event_mask); | |
2252 | break; | |
2253 | } | |
2254 | ||
2255 | if (ret >= 0) | |
2256 | ret = consumed; | |
2257 | ||
2258 | bail: | |
2259 | return ret; | |
2260 | } | |
2261 | ||
49617725 | 2262 | static ssize_t qib_write_iter(struct kiocb *iocb, struct iov_iter *from) |
f931551b RC |
2263 | { |
2264 | struct qib_filedata *fp = iocb->ki_filp->private_data; | |
2265 | struct qib_ctxtdata *rcd = ctxt_fp(iocb->ki_filp); | |
2266 | struct qib_user_sdma_queue *pq = fp->pq; | |
2267 | ||
49617725 | 2268 | if (!iter_is_iovec(from) || !from->nr_segs || !pq) |
f931551b | 2269 | return -EINVAL; |
49617725 AV |
2270 | |
2271 | return qib_user_sdma_writev(rcd, pq, from->iov, from->nr_segs); | |
f931551b RC |
2272 | } |
2273 | ||
2274 | static struct class *qib_class; | |
2275 | static dev_t qib_dev; | |
2276 | ||
2277 | int qib_cdev_init(int minor, const char *name, | |
2278 | const struct file_operations *fops, | |
2279 | struct cdev **cdevp, struct device **devp) | |
2280 | { | |
2281 | const dev_t dev = MKDEV(MAJOR(qib_dev), minor); | |
2282 | struct cdev *cdev; | |
2283 | struct device *device = NULL; | |
2284 | int ret; | |
2285 | ||
2286 | cdev = cdev_alloc(); | |
2287 | if (!cdev) { | |
7fac3301 | 2288 | pr_err("Could not allocate cdev for minor %d, %s\n", |
f931551b RC |
2289 | minor, name); |
2290 | ret = -ENOMEM; | |
2291 | goto done; | |
2292 | } | |
2293 | ||
2294 | cdev->owner = THIS_MODULE; | |
2295 | cdev->ops = fops; | |
2296 | kobject_set_name(&cdev->kobj, name); | |
2297 | ||
2298 | ret = cdev_add(cdev, dev, 1); | |
2299 | if (ret < 0) { | |
7fac3301 | 2300 | pr_err("Could not add cdev for minor %d, %s (err %d)\n", |
f931551b RC |
2301 | minor, name, -ret); |
2302 | goto err_cdev; | |
2303 | } | |
2304 | ||
02aa2a37 | 2305 | device = device_create(qib_class, NULL, dev, NULL, "%s", name); |
f931551b RC |
2306 | if (!IS_ERR(device)) |
2307 | goto done; | |
2308 | ret = PTR_ERR(device); | |
2309 | device = NULL; | |
7fac3301 | 2310 | pr_err("Could not create device for minor %d, %s (err %d)\n", |
f931551b RC |
2311 | minor, name, -ret); |
2312 | err_cdev: | |
2313 | cdev_del(cdev); | |
2314 | cdev = NULL; | |
2315 | done: | |
2316 | *cdevp = cdev; | |
2317 | *devp = device; | |
2318 | return ret; | |
2319 | } | |
2320 | ||
2321 | void qib_cdev_cleanup(struct cdev **cdevp, struct device **devp) | |
2322 | { | |
2323 | struct device *device = *devp; | |
2324 | ||
2325 | if (device) { | |
2326 | device_unregister(device); | |
2327 | *devp = NULL; | |
2328 | } | |
2329 | ||
2330 | if (*cdevp) { | |
2331 | cdev_del(*cdevp); | |
2332 | *cdevp = NULL; | |
2333 | } | |
2334 | } | |
2335 | ||
2336 | static struct cdev *wildcard_cdev; | |
2337 | static struct device *wildcard_device; | |
2338 | ||
2339 | int __init qib_dev_init(void) | |
2340 | { | |
2341 | int ret; | |
2342 | ||
2343 | ret = alloc_chrdev_region(&qib_dev, 0, QIB_NMINORS, QIB_DRV_NAME); | |
2344 | if (ret < 0) { | |
7fac3301 | 2345 | pr_err("Could not allocate chrdev region (err %d)\n", -ret); |
f931551b RC |
2346 | goto done; |
2347 | } | |
2348 | ||
2349 | qib_class = class_create(THIS_MODULE, "ipath"); | |
2350 | if (IS_ERR(qib_class)) { | |
2351 | ret = PTR_ERR(qib_class); | |
7fac3301 | 2352 | pr_err("Could not create device class (err %d)\n", -ret); |
f931551b RC |
2353 | unregister_chrdev_region(qib_dev, QIB_NMINORS); |
2354 | } | |
2355 | ||
2356 | done: | |
2357 | return ret; | |
2358 | } | |
2359 | ||
2360 | void qib_dev_cleanup(void) | |
2361 | { | |
2362 | if (qib_class) { | |
2363 | class_destroy(qib_class); | |
2364 | qib_class = NULL; | |
2365 | } | |
2366 | ||
2367 | unregister_chrdev_region(qib_dev, QIB_NMINORS); | |
2368 | } | |
2369 | ||
2370 | static atomic_t user_count = ATOMIC_INIT(0); | |
2371 | ||
2372 | static void qib_user_remove(struct qib_devdata *dd) | |
2373 | { | |
2374 | if (atomic_dec_return(&user_count) == 0) | |
2375 | qib_cdev_cleanup(&wildcard_cdev, &wildcard_device); | |
2376 | ||
2377 | qib_cdev_cleanup(&dd->user_cdev, &dd->user_device); | |
2378 | } | |
2379 | ||
2380 | static int qib_user_add(struct qib_devdata *dd) | |
2381 | { | |
2382 | char name[10]; | |
2383 | int ret; | |
2384 | ||
2385 | if (atomic_inc_return(&user_count) == 1) { | |
2386 | ret = qib_cdev_init(0, "ipath", &qib_file_ops, | |
2387 | &wildcard_cdev, &wildcard_device); | |
2388 | if (ret) | |
2389 | goto done; | |
2390 | } | |
2391 | ||
2392 | snprintf(name, sizeof(name), "ipath%d", dd->unit); | |
2393 | ret = qib_cdev_init(dd->unit + 1, name, &qib_file_ops, | |
2394 | &dd->user_cdev, &dd->user_device); | |
2395 | if (ret) | |
2396 | qib_user_remove(dd); | |
2397 | done: | |
2398 | return ret; | |
2399 | } | |
2400 | ||
2401 | /* | |
2402 | * Create per-unit files in /dev | |
2403 | */ | |
2404 | int qib_device_create(struct qib_devdata *dd) | |
2405 | { | |
2406 | int r, ret; | |
2407 | ||
2408 | r = qib_user_add(dd); | |
2409 | ret = qib_diag_add(dd); | |
2410 | if (r && !ret) | |
2411 | ret = r; | |
2412 | return ret; | |
2413 | } | |
2414 | ||
2415 | /* | |
2416 | * Remove per-unit files in /dev | |
2417 | * void, core kernel returns no errors for this stuff | |
2418 | */ | |
2419 | void qib_device_remove(struct qib_devdata *dd) | |
2420 | { | |
2421 | qib_user_remove(dd); | |
2422 | qib_diag_remove(dd); | |
2423 | } |