2 * Copyright (c) 2012 Intel Corporation. All rights reserved.
3 * Copyright (c) 2006 - 2012 QLogic Corporation. All rights reserved.
4 * Copyright (c) 2003, 2004, 2005, 2006 PathScale, Inc. All rights reserved.
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:
12 * Redistribution and use in source and binary forms, with or
13 * without modification, are permitted provided that the following
16 * - Redistributions of source code must retain the above
17 * copyright notice, this list of conditions and the following
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.
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
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>
42 #include <linux/uio.h>
43 #include <linux/jiffies.h>
44 #include <asm/pgtable.h>
45 #include <linux/delay.h>
46 #include <linux/export.h>
49 #include "qib_common.h"
50 #include "qib_user_sdma.h"
53 #define pr_fmt(fmt) QIB_DRV_NAME ": " fmt
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 *);
58 static ssize_t qib_aio_write(struct kiocb *, const struct iovec *,
59 unsigned long, loff_t);
60 static unsigned int qib_poll(struct file *, struct poll_table_struct *);
61 static int qib_mmapf(struct file *, struct vm_area_struct *);
63 static const struct file_operations qib_file_ops = {
66 .aio_write = qib_aio_write,
71 .llseek = noop_llseek,
75 * Convert kernel virtual addresses to physical addresses so they don't
76 * potentially conflict with the chip addresses used as mmap offsets.
77 * It doesn't really matter what mmap offset we use as long as we can
78 * interpret it correctly.
80 static u64 cvt_kvaddr(void *p)
85 page = vmalloc_to_page(p);
87 paddr = page_to_pfn(page) << PAGE_SHIFT;
92 static int qib_get_base_info(struct file *fp, void __user *ubase,
95 struct qib_ctxtdata *rcd = ctxt_fp(fp);
97 struct qib_base_info *kinfo = NULL;
98 struct qib_devdata *dd = rcd->dd;
99 struct qib_pportdata *ppd = rcd->ppd;
100 unsigned subctxt_cnt;
104 subctxt_cnt = rcd->subctxt_cnt;
111 master = !subctxt_fp(fp);
115 /* If context sharing is not requested, allow the old size structure */
117 sz -= 7 * sizeof(u64);
118 if (ubase_size < sz) {
123 kinfo = kzalloc(sizeof(*kinfo), GFP_KERNEL);
129 ret = dd->f_get_base_info(rcd, kinfo);
133 kinfo->spi_rcvhdr_cnt = dd->rcvhdrcnt;
134 kinfo->spi_rcvhdrent_size = dd->rcvhdrentsize;
135 kinfo->spi_tidegrcnt = rcd->rcvegrcnt;
136 kinfo->spi_rcv_egrbufsize = dd->rcvegrbufsize;
138 * have to mmap whole thing
140 kinfo->spi_rcv_egrbuftotlen =
141 rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size;
142 kinfo->spi_rcv_egrperchunk = rcd->rcvegrbufs_perchunk;
143 kinfo->spi_rcv_egrchunksize = kinfo->spi_rcv_egrbuftotlen /
144 rcd->rcvegrbuf_chunks;
145 kinfo->spi_tidcnt = dd->rcvtidcnt / subctxt_cnt;
147 kinfo->spi_tidcnt += dd->rcvtidcnt % subctxt_cnt;
149 * for this use, may be cfgctxts summed over all chips that
150 * are are configured and present
152 kinfo->spi_nctxts = dd->cfgctxts;
153 /* unit (chip/board) our context is on */
154 kinfo->spi_unit = dd->unit;
155 kinfo->spi_port = ppd->port;
156 /* for now, only a single page */
157 kinfo->spi_tid_maxsize = PAGE_SIZE;
160 * Doing this per context, and based on the skip value, etc. This has
161 * to be the actual buffer size, since the protocol code treats it
164 * These have to be set to user addresses in the user code via mmap.
165 * These values are used on return to user code for the mmap target
166 * addresses only. For 32 bit, same 44 bit address problem, so use
167 * the physical address, not virtual. Before 2.6.11, using the
168 * page_address() macro worked, but in 2.6.11, even that returns the
169 * full 64 bit address (upper bits all 1's). So far, using the
170 * physical addresses (or chip offsets, for chip mapping) works, but
171 * no doubt some future kernel release will change that, and we'll be
172 * on to yet another method of dealing with this.
173 * Normally only one of rcvhdr_tailaddr or rhf_offset is useful
174 * since the chips with non-zero rhf_offset don't normally
175 * enable tail register updates to host memory, but for testing,
176 * both can be enabled and used.
178 kinfo->spi_rcvhdr_base = (u64) rcd->rcvhdrq_phys;
179 kinfo->spi_rcvhdr_tailaddr = (u64) rcd->rcvhdrqtailaddr_phys;
180 kinfo->spi_rhf_offset = dd->rhf_offset;
181 kinfo->spi_rcv_egrbufs = (u64) rcd->rcvegr_phys;
182 kinfo->spi_pioavailaddr = (u64) dd->pioavailregs_phys;
183 /* setup per-unit (not port) status area for user programs */
184 kinfo->spi_status = (u64) kinfo->spi_pioavailaddr +
185 (char *) ppd->statusp -
186 (char *) dd->pioavailregs_dma;
187 kinfo->spi_uregbase = (u64) dd->uregbase + dd->ureg_align * rcd->ctxt;
189 kinfo->spi_piocnt = rcd->piocnt;
190 kinfo->spi_piobufbase = (u64) rcd->piobufs;
191 kinfo->spi_sendbuf_status = cvt_kvaddr(rcd->user_event_mask);
193 kinfo->spi_piocnt = (rcd->piocnt / subctxt_cnt) +
194 (rcd->piocnt % subctxt_cnt);
195 /* Master's PIO buffers are after all the slave's */
196 kinfo->spi_piobufbase = (u64) rcd->piobufs +
198 (rcd->piocnt - kinfo->spi_piocnt);
200 unsigned slave = subctxt_fp(fp) - 1;
202 kinfo->spi_piocnt = rcd->piocnt / subctxt_cnt;
203 kinfo->spi_piobufbase = (u64) rcd->piobufs +
204 dd->palign * kinfo->spi_piocnt * slave;
208 kinfo->spi_sendbuf_status =
209 cvt_kvaddr(&rcd->user_event_mask[subctxt_fp(fp)]);
210 /* only spi_subctxt_* fields should be set in this block! */
211 kinfo->spi_subctxt_uregbase = cvt_kvaddr(rcd->subctxt_uregbase);
213 kinfo->spi_subctxt_rcvegrbuf =
214 cvt_kvaddr(rcd->subctxt_rcvegrbuf);
215 kinfo->spi_subctxt_rcvhdr_base =
216 cvt_kvaddr(rcd->subctxt_rcvhdr_base);
220 * All user buffers are 2KB buffers. If we ever support
221 * giving 4KB buffers to user processes, this will need some
222 * work. Can't use piobufbase directly, because it has
223 * both 2K and 4K buffer base values.
225 kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->pio2k_bufbase) /
227 kinfo->spi_pioalign = dd->palign;
228 kinfo->spi_qpair = QIB_KD_QP;
230 * user mode PIO buffers are always 2KB, even when 4KB can
231 * be received, and sent via the kernel; this is ibmaxlen
234 kinfo->spi_piosize = dd->piosize2k - 2 * sizeof(u32);
235 kinfo->spi_mtu = ppd->ibmaxlen; /* maxlen, not ibmtu */
236 kinfo->spi_ctxt = rcd->ctxt;
237 kinfo->spi_subctxt = subctxt_fp(fp);
238 kinfo->spi_sw_version = QIB_KERN_SWVERSION;
239 kinfo->spi_sw_version |= 1U << 31; /* QLogic-built, not kernel.org */
240 kinfo->spi_hw_version = dd->revision;
243 kinfo->spi_runtime_flags |= QIB_RUNTIME_MASTER;
245 sz = (ubase_size < sizeof(*kinfo)) ? ubase_size : sizeof(*kinfo);
246 if (copy_to_user(ubase, kinfo, sz))
254 * qib_tid_update - update a context TID
256 * @fp: the qib device file
257 * @ti: the TID information
259 * The new implementation as of Oct 2004 is that the driver assigns
260 * the tid and returns it to the caller. To reduce search time, we
261 * keep a cursor for each context, walking the shadow tid array to find
262 * one that's not in use.
264 * For now, if we can't allocate the full list, we fail, although
265 * in the long run, we'll allocate as many as we can, and the
266 * caller will deal with that by trying the remaining pages later.
267 * That means that when we fail, we have to mark the tids as not in
268 * use again, in our shadow copy.
270 * It's up to the caller to free the tids when they are done.
271 * We'll unlock the pages as they free them.
273 * Also, right now we are locking one page at a time, but since
274 * the intended use of this routine is for a single group of
275 * virtually contiguous pages, that should change to improve
278 static int qib_tid_update(struct qib_ctxtdata *rcd, struct file *fp,
279 const struct qib_tid_info *ti)
282 u32 tid, ctxttid, cnt, i, tidcnt, tidoff;
284 struct qib_devdata *dd = rcd->dd;
287 u64 __iomem *tidbase;
288 unsigned long tidmap[8];
289 struct page **pagep = NULL;
290 unsigned subctxt = subctxt_fp(fp);
292 if (!dd->pageshadow) {
302 ctxttid = rcd->ctxt * dd->rcvtidcnt;
303 if (!rcd->subctxt_cnt) {
304 tidcnt = dd->rcvtidcnt;
305 tid = rcd->tidcursor;
307 } else if (!subctxt) {
308 tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) +
309 (dd->rcvtidcnt % rcd->subctxt_cnt);
310 tidoff = dd->rcvtidcnt - tidcnt;
312 tid = tidcursor_fp(fp);
314 tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt;
315 tidoff = tidcnt * (subctxt - 1);
317 tid = tidcursor_fp(fp);
320 /* make sure it all fits in tid_pg_list */
321 qib_devinfo(dd->pcidev,
322 "Process tried to allocate %u TIDs, only trying max (%u)\n",
326 pagep = (struct page **) rcd->tid_pg_list;
327 tidlist = (u16 *) &pagep[dd->rcvtidcnt];
331 memset(tidmap, 0, sizeof(tidmap));
332 /* before decrement; chip actual # */
334 tidbase = (u64 __iomem *) (((char __iomem *) dd->kregbase) +
336 ctxttid * sizeof(*tidbase));
338 /* virtual address of first page in transfer */
339 vaddr = ti->tidvaddr;
340 if (!access_ok(VERIFY_WRITE, (void __user *) vaddr,
345 ret = qib_get_user_pages(vaddr, cnt, pagep);
349 * We can't continue because the pagep array won't be
350 * initialized. This should never happen,
351 * unless perhaps the user has mpin'ed the pages
354 qib_devinfo(dd->pcidev,
355 "Failed to lock addr %p, %u pages: "
356 "errno %d\n", (void *) vaddr, cnt, -ret);
359 for (i = 0; i < cnt; i++, vaddr += PAGE_SIZE) {
360 for (; ntids--; tid++) {
363 if (!dd->pageshadow[ctxttid + tid])
368 * Oops, wrapped all the way through their TIDs,
369 * and didn't have enough free; see comments at
372 i--; /* last tidlist[i] not filled in */
376 tidlist[i] = tid + tidoff;
377 /* we "know" system pages and TID pages are same size */
378 dd->pageshadow[ctxttid + tid] = pagep[i];
379 dd->physshadow[ctxttid + tid] =
380 qib_map_page(dd->pcidev, pagep[i], 0, PAGE_SIZE,
383 * don't need atomic or it's overhead
385 __set_bit(tid, tidmap);
386 physaddr = dd->physshadow[ctxttid + tid];
387 /* PERFORMANCE: below should almost certainly be cached */
388 dd->f_put_tid(dd, &tidbase[tid],
389 RCVHQ_RCV_TYPE_EXPECTED, physaddr);
391 * don't check this tid in qib_ctxtshadow, since we
392 * just filled it in; start with the next one.
400 /* jump here if copy out of updated info failed... */
401 /* same code that's in qib_free_tid() */
402 limit = sizeof(tidmap) * BITS_PER_BYTE;
404 /* just in case size changes in future */
406 tid = find_first_bit((const unsigned long *)tidmap, limit);
407 for (; tid < limit; tid++) {
408 if (!test_bit(tid, tidmap))
410 if (dd->pageshadow[ctxttid + tid]) {
413 phys = dd->physshadow[ctxttid + tid];
414 dd->physshadow[ctxttid + tid] = dd->tidinvalid;
415 /* PERFORMANCE: below should almost certainly
418 dd->f_put_tid(dd, &tidbase[tid],
419 RCVHQ_RCV_TYPE_EXPECTED,
421 pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
423 dd->pageshadow[ctxttid + tid] = NULL;
426 qib_release_user_pages(pagep, cnt);
429 * Copy the updated array, with qib_tid's filled in, back
430 * to user. Since we did the copy in already, this "should
431 * never fail" If it does, we have to clean up...
433 if (copy_to_user((void __user *)
434 (unsigned long) ti->tidlist,
435 tidlist, cnt * sizeof(*tidlist))) {
439 if (copy_to_user((void __user *) (unsigned long) ti->tidmap,
440 tidmap, sizeof tidmap)) {
446 if (!rcd->subctxt_cnt)
447 rcd->tidcursor = tid;
449 tidcursor_fp(fp) = tid;
457 * qib_tid_free - free a context TID
459 * @subctxt: the subcontext
462 * right now we are unlocking one page at a time, but since
463 * the intended use of this routine is for a single group of
464 * virtually contiguous pages, that should change to improve
465 * performance. We check that the TID is in range for this context
466 * but otherwise don't check validity; if user has an error and
467 * frees the wrong tid, it's only their own data that can thereby
468 * be corrupted. We do check that the TID was in use, for sanity
469 * We always use our idea of the saved address, not the address that
470 * they pass in to us.
472 static int qib_tid_free(struct qib_ctxtdata *rcd, unsigned subctxt,
473 const struct qib_tid_info *ti)
476 u32 tid, ctxttid, cnt, limit, tidcnt;
477 struct qib_devdata *dd = rcd->dd;
478 u64 __iomem *tidbase;
479 unsigned long tidmap[8];
481 if (!dd->pageshadow) {
486 if (copy_from_user(tidmap, (void __user *)(unsigned long)ti->tidmap,
492 ctxttid = rcd->ctxt * dd->rcvtidcnt;
493 if (!rcd->subctxt_cnt)
494 tidcnt = dd->rcvtidcnt;
496 tidcnt = (dd->rcvtidcnt / rcd->subctxt_cnt) +
497 (dd->rcvtidcnt % rcd->subctxt_cnt);
498 ctxttid += dd->rcvtidcnt - tidcnt;
500 tidcnt = dd->rcvtidcnt / rcd->subctxt_cnt;
501 ctxttid += tidcnt * (subctxt - 1);
503 tidbase = (u64 __iomem *) ((char __iomem *)(dd->kregbase) +
505 ctxttid * sizeof(*tidbase));
507 limit = sizeof(tidmap) * BITS_PER_BYTE;
509 /* just in case size changes in future */
511 tid = find_first_bit(tidmap, limit);
512 for (cnt = 0; tid < limit; tid++) {
514 * small optimization; if we detect a run of 3 or so without
515 * any set, use find_first_bit again. That's mainly to
516 * accelerate the case where we wrapped, so we have some at
517 * the beginning, and some at the end, and a big gap
520 if (!test_bit(tid, tidmap))
523 if (dd->pageshadow[ctxttid + tid]) {
527 p = dd->pageshadow[ctxttid + tid];
528 dd->pageshadow[ctxttid + tid] = NULL;
529 phys = dd->physshadow[ctxttid + tid];
530 dd->physshadow[ctxttid + tid] = dd->tidinvalid;
531 /* PERFORMANCE: below should almost certainly be
534 dd->f_put_tid(dd, &tidbase[tid],
535 RCVHQ_RCV_TYPE_EXPECTED, dd->tidinvalid);
536 pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
538 qib_release_user_pages(&p, 1);
546 * qib_set_part_key - set a partition key
550 * We can have up to 4 active at a time (other than the default, which is
551 * always allowed). This is somewhat tricky, since multiple contexts may set
552 * the same key, so we reference count them, and clean up at exit. All 4
553 * partition keys are packed into a single qlogic_ib register. It's an
554 * error for a process to set the same pkey multiple times. We provide no
555 * mechanism to de-allocate a pkey at this time, we may eventually need to
556 * do that. I've used the atomic operations, and no locking, and only make
557 * a single pass through what's available. This should be more than
558 * adequate for some time. I'll think about spinlocks or the like if and as
561 static int qib_set_part_key(struct qib_ctxtdata *rcd, u16 key)
563 struct qib_pportdata *ppd = rcd->ppd;
564 int i, any = 0, pidx = -1;
565 u16 lkey = key & 0x7FFF;
568 if (lkey == (QIB_DEFAULT_P_KEY & 0x7FFF)) {
569 /* nothing to do; this key always valid */
580 * Set the full membership bit, because it has to be
581 * set in the register or the packet, and it seems
582 * cleaner to set in the register than to force all
587 for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) {
588 if (!rcd->pkeys[i] && pidx == -1)
590 if (rcd->pkeys[i] == key) {
599 for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
600 if (!ppd->pkeys[i]) {
604 if (ppd->pkeys[i] == key) {
605 atomic_t *pkrefs = &ppd->pkeyrefs[i];
607 if (atomic_inc_return(pkrefs) > 1) {
608 rcd->pkeys[pidx] = key;
613 * lost race, decrement count, catch below
619 if ((ppd->pkeys[i] & 0x7FFF) == lkey) {
621 * It makes no sense to have both the limited and
622 * full membership PKEY set at the same time since
623 * the unlimited one will disable the limited one.
633 for (any = i = 0; i < ARRAY_SIZE(ppd->pkeys); i++) {
634 if (!ppd->pkeys[i] &&
635 atomic_inc_return(&ppd->pkeyrefs[i]) == 1) {
636 rcd->pkeys[pidx] = key;
638 (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0);
650 * qib_manage_rcvq - manage a context's receive queue
652 * @subctxt: the subcontext
653 * @start_stop: action to carry out
655 * start_stop == 0 disables receive on the context, for use in queue
656 * overflow conditions. start_stop==1 re-enables, to be used to
657 * re-init the software copy of the head register
659 static int qib_manage_rcvq(struct qib_ctxtdata *rcd, unsigned subctxt,
662 struct qib_devdata *dd = rcd->dd;
663 unsigned int rcvctrl_op;
667 /* atomically clear receive enable ctxt. */
670 * On enable, force in-memory copy of the tail register to
671 * 0, so that protocol code doesn't have to worry about
672 * whether or not the chip has yet updated the in-memory
673 * copy or not on return from the system call. The chip
674 * always resets it's tail register back to 0 on a
675 * transition from disabled to enabled.
677 if (rcd->rcvhdrtail_kvaddr)
678 qib_clear_rcvhdrtail(rcd);
679 rcvctrl_op = QIB_RCVCTRL_CTXT_ENB;
681 rcvctrl_op = QIB_RCVCTRL_CTXT_DIS;
682 dd->f_rcvctrl(rcd->ppd, rcvctrl_op, rcd->ctxt);
683 /* always; new head should be equal to new tail; see above */
688 static void qib_clean_part_key(struct qib_ctxtdata *rcd,
689 struct qib_devdata *dd)
691 int i, j, pchanged = 0;
693 struct qib_pportdata *ppd = rcd->ppd;
695 /* for debugging only */
696 oldpkey = (u64) ppd->pkeys[0] |
697 ((u64) ppd->pkeys[1] << 16) |
698 ((u64) ppd->pkeys[2] << 32) |
699 ((u64) ppd->pkeys[3] << 48);
701 for (i = 0; i < ARRAY_SIZE(rcd->pkeys); i++) {
704 for (j = 0; j < ARRAY_SIZE(ppd->pkeys); j++) {
705 /* check for match independent of the global bit */
706 if ((ppd->pkeys[j] & 0x7fff) !=
707 (rcd->pkeys[i] & 0x7fff))
709 if (atomic_dec_and_test(&ppd->pkeyrefs[j])) {
718 (void) ppd->dd->f_set_ib_cfg(ppd, QIB_IB_CFG_PKEYS, 0);
721 /* common code for the mappings on dma_alloc_coherent mem */
722 static int qib_mmap_mem(struct vm_area_struct *vma, struct qib_ctxtdata *rcd,
723 unsigned len, void *kvaddr, u32 write_ok, char *what)
725 struct qib_devdata *dd = rcd->dd;
729 if ((vma->vm_end - vma->vm_start) > len) {
730 qib_devinfo(dd->pcidev,
731 "FAIL on %s: len %lx > %x\n", what,
732 vma->vm_end - vma->vm_start, len);
738 * shared context user code requires rcvhdrq mapped r/w, others
739 * only allowed readonly mapping.
742 if (vma->vm_flags & VM_WRITE) {
743 qib_devinfo(dd->pcidev,
744 "%s must be mapped readonly\n", what);
749 /* don't allow them to later change with mprotect */
750 vma->vm_flags &= ~VM_MAYWRITE;
753 pfn = virt_to_phys(kvaddr) >> PAGE_SHIFT;
754 ret = remap_pfn_range(vma, vma->vm_start, pfn,
755 len, vma->vm_page_prot);
757 qib_devinfo(dd->pcidev,
758 "%s ctxt%u mmap of %lx, %x bytes failed: %d\n",
759 what, rcd->ctxt, pfn, len, ret);
764 static int mmap_ureg(struct vm_area_struct *vma, struct qib_devdata *dd,
772 * This is real hardware, so use io_remap. This is the mechanism
773 * for the user process to update the head registers for their ctxt
776 sz = dd->flags & QIB_HAS_HDRSUPP ? 2 * PAGE_SIZE : PAGE_SIZE;
777 if ((vma->vm_end - vma->vm_start) > sz) {
778 qib_devinfo(dd->pcidev,
779 "FAIL mmap userreg: reqlen %lx > PAGE\n",
780 vma->vm_end - vma->vm_start);
783 phys = dd->physaddr + ureg;
784 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
786 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
787 ret = io_remap_pfn_range(vma, vma->vm_start,
789 vma->vm_end - vma->vm_start,
795 static int mmap_piobufs(struct vm_area_struct *vma,
796 struct qib_devdata *dd,
797 struct qib_ctxtdata *rcd,
798 unsigned piobufs, unsigned piocnt)
804 * When we map the PIO buffers in the chip, we want to map them as
805 * writeonly, no read possible; unfortunately, x86 doesn't allow
806 * for this in hardware, but we still prevent users from asking
809 if ((vma->vm_end - vma->vm_start) > (piocnt * dd->palign)) {
810 qib_devinfo(dd->pcidev,
811 "FAIL mmap piobufs: reqlen %lx > PAGE\n",
812 vma->vm_end - vma->vm_start);
817 phys = dd->physaddr + piobufs;
819 #if defined(__powerpc__)
820 /* There isn't a generic way to specify writethrough mappings */
821 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE;
822 pgprot_val(vma->vm_page_prot) |= _PAGE_WRITETHRU;
823 pgprot_val(vma->vm_page_prot) &= ~_PAGE_GUARDED;
827 * don't allow them to later change to readable with mprotect (for when
828 * not initially mapped readable, as is normally the case)
830 vma->vm_flags &= ~VM_MAYREAD;
831 vma->vm_flags |= VM_DONTCOPY | VM_DONTEXPAND;
834 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
836 ret = io_remap_pfn_range(vma, vma->vm_start, phys >> PAGE_SHIFT,
837 vma->vm_end - vma->vm_start,
843 static int mmap_rcvegrbufs(struct vm_area_struct *vma,
844 struct qib_ctxtdata *rcd)
846 struct qib_devdata *dd = rcd->dd;
847 unsigned long start, size;
848 size_t total_size, i;
852 size = rcd->rcvegrbuf_size;
853 total_size = rcd->rcvegrbuf_chunks * size;
854 if ((vma->vm_end - vma->vm_start) > total_size) {
855 qib_devinfo(dd->pcidev,
856 "FAIL on egr bufs: reqlen %lx > actual %lx\n",
857 vma->vm_end - vma->vm_start,
858 (unsigned long) total_size);
863 if (vma->vm_flags & VM_WRITE) {
864 qib_devinfo(dd->pcidev,
865 "Can't map eager buffers as writable (flags=%lx)\n",
870 /* don't allow them to later change to writeable with mprotect */
871 vma->vm_flags &= ~VM_MAYWRITE;
873 start = vma->vm_start;
875 for (i = 0; i < rcd->rcvegrbuf_chunks; i++, start += size) {
876 pfn = virt_to_phys(rcd->rcvegrbuf[i]) >> PAGE_SHIFT;
877 ret = remap_pfn_range(vma, start, pfn, size,
889 * qib_file_vma_fault - handle a VMA page fault.
891 static int qib_file_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
895 page = vmalloc_to_page((void *)(vmf->pgoff << PAGE_SHIFT));
897 return VM_FAULT_SIGBUS;
905 static struct vm_operations_struct qib_file_vm_ops = {
906 .fault = qib_file_vma_fault,
909 static int mmap_kvaddr(struct vm_area_struct *vma, u64 pgaddr,
910 struct qib_ctxtdata *rcd, unsigned subctxt)
912 struct qib_devdata *dd = rcd->dd;
913 unsigned subctxt_cnt;
919 subctxt_cnt = rcd->subctxt_cnt;
920 size = rcd->rcvegrbuf_chunks * rcd->rcvegrbuf_size;
923 * Each process has all the subctxt uregbase, rcvhdrq, and
924 * rcvegrbufs mmapped - as an array for all the processes,
925 * and also separately for this process.
927 if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase)) {
928 addr = rcd->subctxt_uregbase;
929 size = PAGE_SIZE * subctxt_cnt;
930 } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base)) {
931 addr = rcd->subctxt_rcvhdr_base;
932 size = rcd->rcvhdrq_size * subctxt_cnt;
933 } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf)) {
934 addr = rcd->subctxt_rcvegrbuf;
936 } else if (pgaddr == cvt_kvaddr(rcd->subctxt_uregbase +
937 PAGE_SIZE * subctxt)) {
938 addr = rcd->subctxt_uregbase + PAGE_SIZE * subctxt;
940 } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvhdr_base +
941 rcd->rcvhdrq_size * subctxt)) {
942 addr = rcd->subctxt_rcvhdr_base +
943 rcd->rcvhdrq_size * subctxt;
944 size = rcd->rcvhdrq_size;
945 } else if (pgaddr == cvt_kvaddr(&rcd->user_event_mask[subctxt])) {
946 addr = rcd->user_event_mask;
948 } else if (pgaddr == cvt_kvaddr(rcd->subctxt_rcvegrbuf +
950 addr = rcd->subctxt_rcvegrbuf + size * subctxt;
951 /* rcvegrbufs are read-only on the slave */
952 if (vma->vm_flags & VM_WRITE) {
953 qib_devinfo(dd->pcidev,
954 "Can't map eager buffers as "
955 "writable (flags=%lx)\n", vma->vm_flags);
960 * Don't allow permission to later change to writeable
963 vma->vm_flags &= ~VM_MAYWRITE;
966 len = vma->vm_end - vma->vm_start;
972 vma->vm_pgoff = (unsigned long) addr >> PAGE_SHIFT;
973 vma->vm_ops = &qib_file_vm_ops;
974 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
982 * qib_mmapf - mmap various structures into user space
983 * @fp: the file pointer
986 * We use this to have a shared buffer between the kernel and the user code
987 * for the rcvhdr queue, egr buffers, and the per-context user regs and pio
988 * buffers in the chip. We have the open and close entries so we can bump
989 * the ref count and keep the driver from being unloaded while still mapped.
991 static int qib_mmapf(struct file *fp, struct vm_area_struct *vma)
993 struct qib_ctxtdata *rcd;
994 struct qib_devdata *dd;
996 unsigned piobufs, piocnt;
1000 if (!rcd || !(vma->vm_flags & VM_SHARED)) {
1007 * This is the qib_do_user_init() code, mapping the shared buffers
1008 * and per-context user registers into the user process. The address
1009 * referred to by vm_pgoff is the file offset passed via mmap().
1010 * For shared contexts, this is the kernel vmalloc() address of the
1011 * pages to share with the master.
1012 * For non-shared or master ctxts, this is a physical address.
1013 * We only do one mmap for each space mapped.
1015 pgaddr = vma->vm_pgoff << PAGE_SHIFT;
1018 * Check for 0 in case one of the allocations failed, but user
1019 * called mmap anyway.
1027 * Physical addresses must fit in 40 bits for our hardware.
1028 * Check for kernel virtual addresses first, anything else must
1029 * match a HW or memory address.
1031 ret = mmap_kvaddr(vma, pgaddr, rcd, subctxt_fp(fp));
1038 ureg = dd->uregbase + dd->ureg_align * rcd->ctxt;
1039 if (!rcd->subctxt_cnt) {
1040 /* ctxt is not shared */
1041 piocnt = rcd->piocnt;
1042 piobufs = rcd->piobufs;
1043 } else if (!subctxt_fp(fp)) {
1044 /* caller is the master */
1045 piocnt = (rcd->piocnt / rcd->subctxt_cnt) +
1046 (rcd->piocnt % rcd->subctxt_cnt);
1047 piobufs = rcd->piobufs +
1048 dd->palign * (rcd->piocnt - piocnt);
1050 unsigned slave = subctxt_fp(fp) - 1;
1052 /* caller is a slave */
1053 piocnt = rcd->piocnt / rcd->subctxt_cnt;
1054 piobufs = rcd->piobufs + dd->palign * piocnt * slave;
1058 ret = mmap_ureg(vma, dd, ureg);
1059 else if (pgaddr == piobufs)
1060 ret = mmap_piobufs(vma, dd, rcd, piobufs, piocnt);
1061 else if (pgaddr == dd->pioavailregs_phys)
1062 /* in-memory copy of pioavail registers */
1063 ret = qib_mmap_mem(vma, rcd, PAGE_SIZE,
1064 (void *) dd->pioavailregs_dma, 0,
1065 "pioavail registers");
1066 else if (pgaddr == rcd->rcvegr_phys)
1067 ret = mmap_rcvegrbufs(vma, rcd);
1068 else if (pgaddr == (u64) rcd->rcvhdrq_phys)
1070 * The rcvhdrq itself; multiple pages, contiguous
1071 * from an i/o perspective. Shared contexts need
1072 * to map r/w, so we allow writing.
1074 ret = qib_mmap_mem(vma, rcd, rcd->rcvhdrq_size,
1075 rcd->rcvhdrq, 1, "rcvhdrq");
1076 else if (pgaddr == (u64) rcd->rcvhdrqtailaddr_phys)
1077 /* in-memory copy of rcvhdrq tail register */
1078 ret = qib_mmap_mem(vma, rcd, PAGE_SIZE,
1079 rcd->rcvhdrtail_kvaddr, 0,
1086 vma->vm_private_data = NULL;
1089 qib_devinfo(dd->pcidev,
1090 "mmap Failure %d: off %llx len %lx\n",
1091 -ret, (unsigned long long)pgaddr,
1092 vma->vm_end - vma->vm_start);
1097 static unsigned int qib_poll_urgent(struct qib_ctxtdata *rcd,
1099 struct poll_table_struct *pt)
1101 struct qib_devdata *dd = rcd->dd;
1104 poll_wait(fp, &rcd->wait, pt);
1106 spin_lock_irq(&dd->uctxt_lock);
1107 if (rcd->urgent != rcd->urgent_poll) {
1108 pollflag = POLLIN | POLLRDNORM;
1109 rcd->urgent_poll = rcd->urgent;
1112 set_bit(QIB_CTXT_WAITING_URG, &rcd->flag);
1114 spin_unlock_irq(&dd->uctxt_lock);
1119 static unsigned int qib_poll_next(struct qib_ctxtdata *rcd,
1121 struct poll_table_struct *pt)
1123 struct qib_devdata *dd = rcd->dd;
1126 poll_wait(fp, &rcd->wait, pt);
1128 spin_lock_irq(&dd->uctxt_lock);
1129 if (dd->f_hdrqempty(rcd)) {
1130 set_bit(QIB_CTXT_WAITING_RCV, &rcd->flag);
1131 dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_INTRAVAIL_ENB, rcd->ctxt);
1134 pollflag = POLLIN | POLLRDNORM;
1135 spin_unlock_irq(&dd->uctxt_lock);
1140 static unsigned int qib_poll(struct file *fp, struct poll_table_struct *pt)
1142 struct qib_ctxtdata *rcd;
1148 else if (rcd->poll_type == QIB_POLL_TYPE_URGENT)
1149 pollflag = qib_poll_urgent(rcd, fp, pt);
1150 else if (rcd->poll_type == QIB_POLL_TYPE_ANYRCV)
1151 pollflag = qib_poll_next(rcd, fp, pt);
1159 * Check that userland and driver are compatible for subcontexts.
1161 static int qib_compatible_subctxts(int user_swmajor, int user_swminor)
1163 /* this code is written long-hand for clarity */
1164 if (QIB_USER_SWMAJOR != user_swmajor) {
1165 /* no promise of compatibility if major mismatch */
1168 if (QIB_USER_SWMAJOR == 1) {
1169 switch (QIB_USER_SWMINOR) {
1173 /* no subctxt implementation so cannot be compatible */
1176 /* 3 is only compatible with itself */
1177 return user_swminor == 3;
1179 /* >= 4 are compatible (or are expected to be) */
1180 return user_swminor >= 4;
1183 /* make no promises yet for future major versions */
1187 static int init_subctxts(struct qib_devdata *dd,
1188 struct qib_ctxtdata *rcd,
1189 const struct qib_user_info *uinfo)
1192 unsigned num_subctxts;
1196 * If the user is requesting zero subctxts,
1197 * skip the subctxt allocation.
1199 if (uinfo->spu_subctxt_cnt <= 0)
1201 num_subctxts = uinfo->spu_subctxt_cnt;
1203 /* Check for subctxt compatibility */
1204 if (!qib_compatible_subctxts(uinfo->spu_userversion >> 16,
1205 uinfo->spu_userversion & 0xffff)) {
1206 qib_devinfo(dd->pcidev,
1207 "Mismatched user version (%d.%d) and driver "
1208 "version (%d.%d) while context sharing. Ensure "
1209 "that driver and library are from the same "
1211 (int) (uinfo->spu_userversion >> 16),
1212 (int) (uinfo->spu_userversion & 0xffff),
1213 QIB_USER_SWMAJOR, QIB_USER_SWMINOR);
1216 if (num_subctxts > QLOGIC_IB_MAX_SUBCTXT) {
1221 rcd->subctxt_uregbase = vmalloc_user(PAGE_SIZE * num_subctxts);
1222 if (!rcd->subctxt_uregbase) {
1226 /* Note: rcd->rcvhdrq_size isn't initialized yet. */
1227 size = ALIGN(dd->rcvhdrcnt * dd->rcvhdrentsize *
1228 sizeof(u32), PAGE_SIZE) * num_subctxts;
1229 rcd->subctxt_rcvhdr_base = vmalloc_user(size);
1230 if (!rcd->subctxt_rcvhdr_base) {
1235 rcd->subctxt_rcvegrbuf = vmalloc_user(rcd->rcvegrbuf_chunks *
1236 rcd->rcvegrbuf_size *
1238 if (!rcd->subctxt_rcvegrbuf) {
1243 rcd->subctxt_cnt = uinfo->spu_subctxt_cnt;
1244 rcd->subctxt_id = uinfo->spu_subctxt_id;
1245 rcd->active_slaves = 1;
1246 rcd->redirect_seq_cnt = 1;
1247 set_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag);
1251 vfree(rcd->subctxt_rcvhdr_base);
1253 vfree(rcd->subctxt_uregbase);
1254 rcd->subctxt_uregbase = NULL;
1259 static int setup_ctxt(struct qib_pportdata *ppd, int ctxt,
1260 struct file *fp, const struct qib_user_info *uinfo)
1262 struct qib_devdata *dd = ppd->dd;
1263 struct qib_ctxtdata *rcd;
1267 rcd = qib_create_ctxtdata(ppd, ctxt);
1270 * Allocate memory for use in qib_tid_update() at open to
1271 * reduce cost of expected send setup per message segment
1274 ptmp = kmalloc(dd->rcvtidcnt * sizeof(u16) +
1275 dd->rcvtidcnt * sizeof(struct page **),
1278 if (!rcd || !ptmp) {
1280 "Unable to allocate ctxtdata memory, failing open\n");
1284 rcd->userversion = uinfo->spu_userversion;
1285 ret = init_subctxts(dd, rcd, uinfo);
1288 rcd->tid_pg_list = ptmp;
1289 rcd->pid = current->pid;
1290 init_waitqueue_head(&dd->rcd[ctxt]->wait);
1291 strlcpy(rcd->comm, current->comm, sizeof(rcd->comm));
1293 qib_stats.sps_ctxts++;
1299 dd->rcd[ctxt] = NULL;
1306 static inline int usable(struct qib_pportdata *ppd)
1308 struct qib_devdata *dd = ppd->dd;
1310 return dd && (dd->flags & QIB_PRESENT) && dd->kregbase && ppd->lid &&
1311 (ppd->lflags & QIBL_LINKACTIVE);
1315 * Select a context on the given device, either using a requested port
1316 * or the port based on the context number.
1318 static int choose_port_ctxt(struct file *fp, struct qib_devdata *dd, u32 port,
1319 const struct qib_user_info *uinfo)
1321 struct qib_pportdata *ppd = NULL;
1325 if (!usable(dd->pport + port - 1)) {
1329 ppd = dd->pport + port - 1;
1331 for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts && dd->rcd[ctxt];
1334 if (ctxt == dd->cfgctxts) {
1339 u32 pidx = ctxt % dd->num_pports;
1340 if (usable(dd->pport + pidx))
1341 ppd = dd->pport + pidx;
1343 for (pidx = 0; pidx < dd->num_pports && !ppd;
1345 if (usable(dd->pport + pidx))
1346 ppd = dd->pport + pidx;
1349 ret = ppd ? setup_ctxt(ppd, ctxt, fp, uinfo) : -ENETDOWN;
1354 static int find_free_ctxt(int unit, struct file *fp,
1355 const struct qib_user_info *uinfo)
1357 struct qib_devdata *dd = qib_lookup(unit);
1360 if (!dd || (uinfo->spu_port && uinfo->spu_port > dd->num_pports))
1363 ret = choose_port_ctxt(fp, dd, uinfo->spu_port, uinfo);
1368 static int get_a_ctxt(struct file *fp, const struct qib_user_info *uinfo,
1371 struct qib_devdata *udd = NULL;
1372 int ret = 0, devmax, npresent, nup, ndev, dusable = 0, i;
1373 u32 port = uinfo->spu_port, ctxt;
1375 devmax = qib_count_units(&npresent, &nup);
1385 if (alg == QIB_PORT_ALG_ACROSS) {
1386 unsigned inuse = ~0U;
1387 /* find device (with ACTIVE ports) with fewest ctxts in use */
1388 for (ndev = 0; ndev < devmax; ndev++) {
1389 struct qib_devdata *dd = qib_lookup(ndev);
1390 unsigned cused = 0, cfree = 0, pusable = 0;
1393 if (port && port <= dd->num_pports &&
1394 usable(dd->pport + port - 1))
1397 for (i = 0; i < dd->num_pports; i++)
1398 if (usable(dd->pport + i))
1402 for (ctxt = dd->first_user_ctxt; ctxt < dd->cfgctxts;
1408 if (pusable && cfree && cused < inuse) {
1414 ret = choose_port_ctxt(fp, udd, port, uinfo);
1418 for (ndev = 0; ndev < devmax; ndev++) {
1419 struct qib_devdata *dd = qib_lookup(ndev);
1421 ret = choose_port_ctxt(fp, dd, port, uinfo);
1429 ret = dusable ? -EBUSY : -ENETDOWN;
1435 static int find_shared_ctxt(struct file *fp,
1436 const struct qib_user_info *uinfo)
1438 int devmax, ndev, i;
1441 devmax = qib_count_units(NULL, NULL);
1443 for (ndev = 0; ndev < devmax; ndev++) {
1444 struct qib_devdata *dd = qib_lookup(ndev);
1446 /* device portion of usable() */
1447 if (!(dd && (dd->flags & QIB_PRESENT) && dd->kregbase))
1449 for (i = dd->first_user_ctxt; i < dd->cfgctxts; i++) {
1450 struct qib_ctxtdata *rcd = dd->rcd[i];
1452 /* Skip ctxts which are not yet open */
1453 if (!rcd || !rcd->cnt)
1455 /* Skip ctxt if it doesn't match the requested one */
1456 if (rcd->subctxt_id != uinfo->spu_subctxt_id)
1458 /* Verify the sharing process matches the master */
1459 if (rcd->subctxt_cnt != uinfo->spu_subctxt_cnt ||
1460 rcd->userversion != uinfo->spu_userversion ||
1461 rcd->cnt >= rcd->subctxt_cnt) {
1466 subctxt_fp(fp) = rcd->cnt++;
1467 rcd->subpid[subctxt_fp(fp)] = current->pid;
1468 tidcursor_fp(fp) = 0;
1469 rcd->active_slaves |= 1 << subctxt_fp(fp);
1479 static int qib_open(struct inode *in, struct file *fp)
1481 /* The real work is performed later in qib_assign_ctxt() */
1482 fp->private_data = kzalloc(sizeof(struct qib_filedata), GFP_KERNEL);
1483 if (fp->private_data) /* no cpu affinity by default */
1484 ((struct qib_filedata *)fp->private_data)->rec_cpu_num = -1;
1485 return fp->private_data ? 0 : -ENOMEM;
1489 * Get ctxt early, so can set affinity prior to memory allocation.
1491 static int qib_assign_ctxt(struct file *fp, const struct qib_user_info *uinfo)
1495 unsigned swmajor, swminor, alg = QIB_PORT_ALG_ACROSS;
1497 /* Check to be sure we haven't already initialized this file */
1503 /* for now, if major version is different, bail */
1504 swmajor = uinfo->spu_userversion >> 16;
1505 if (swmajor != QIB_USER_SWMAJOR) {
1510 swminor = uinfo->spu_userversion & 0xffff;
1512 if (swminor >= 11 && uinfo->spu_port_alg < QIB_PORT_ALG_COUNT)
1513 alg = uinfo->spu_port_alg;
1515 mutex_lock(&qib_mutex);
1517 if (qib_compatible_subctxts(swmajor, swminor) &&
1518 uinfo->spu_subctxt_cnt) {
1519 ret = find_shared_ctxt(fp, uinfo);
1527 i_minor = iminor(file_inode(fp)) - QIB_USER_MINOR_BASE;
1529 ret = find_free_ctxt(i_minor - 1, fp, uinfo);
1531 ret = get_a_ctxt(fp, uinfo, alg);
1535 struct qib_filedata *fd = fp->private_data;
1536 const struct qib_ctxtdata *rcd = fd->rcd;
1537 const struct qib_devdata *dd = rcd->dd;
1538 unsigned int weight;
1540 if (dd->flags & QIB_HAS_SEND_DMA) {
1541 fd->pq = qib_user_sdma_queue_create(&dd->pcidev->dev,
1550 * If process has NOT already set it's affinity, select and
1551 * reserve a processor for it, as a rendezvous for all
1552 * users of the driver. If they don't actually later
1553 * set affinity to this cpu, or set it to some other cpu,
1554 * it just means that sooner or later we don't recommend
1555 * a cpu, and let the scheduler do it's best.
1557 weight = cpumask_weight(tsk_cpus_allowed(current));
1558 if (!ret && weight >= qib_cpulist_count) {
1560 cpu = find_first_zero_bit(qib_cpulist,
1562 if (cpu != qib_cpulist_count) {
1563 __set_bit(cpu, qib_cpulist);
1564 fd->rec_cpu_num = cpu;
1566 } else if (weight == 1 &&
1567 test_bit(cpumask_first(tsk_cpus_allowed(current)),
1569 qib_devinfo(dd->pcidev,
1570 "%s PID %u affinity set to cpu %d; already allocated\n",
1571 current->comm, current->pid,
1572 cpumask_first(tsk_cpus_allowed(current)));
1575 mutex_unlock(&qib_mutex);
1582 static int qib_do_user_init(struct file *fp,
1583 const struct qib_user_info *uinfo)
1586 struct qib_ctxtdata *rcd = ctxt_fp(fp);
1587 struct qib_devdata *dd;
1590 /* Subctxts don't need to initialize anything since master did it. */
1591 if (subctxt_fp(fp)) {
1592 ret = wait_event_interruptible(rcd->wait,
1593 !test_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag));
1599 /* some ctxts may get extra buffers, calculate that here */
1600 uctxt = rcd->ctxt - dd->first_user_ctxt;
1601 if (uctxt < dd->ctxts_extrabuf) {
1602 rcd->piocnt = dd->pbufsctxt + 1;
1603 rcd->pio_base = rcd->piocnt * uctxt;
1605 rcd->piocnt = dd->pbufsctxt;
1606 rcd->pio_base = rcd->piocnt * uctxt +
1611 * All user buffers are 2KB buffers. If we ever support
1612 * giving 4KB buffers to user processes, this will need some
1613 * work. Can't use piobufbase directly, because it has
1614 * both 2K and 4K buffer base values. So check and handle.
1616 if ((rcd->pio_base + rcd->piocnt) > dd->piobcnt2k) {
1617 if (rcd->pio_base >= dd->piobcnt2k) {
1619 "%u:ctxt%u: no 2KB buffers available\n",
1620 dd->unit, rcd->ctxt);
1624 rcd->piocnt = dd->piobcnt2k - rcd->pio_base;
1625 qib_dev_err(dd, "Ctxt%u: would use 4KB bufs, using %u\n",
1626 rcd->ctxt, rcd->piocnt);
1629 rcd->piobufs = dd->pio2k_bufbase + rcd->pio_base * dd->palign;
1630 qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt,
1631 TXCHK_CHG_TYPE_USER, rcd);
1633 * try to ensure that processes start up with consistent avail update
1634 * for their own range, at least. If system very quiet, it might
1635 * have the in-memory copy out of date at startup for this range of
1636 * buffers, when a context gets re-used. Do after the chg_pioavail
1637 * and before the rest of setup, so it's "almost certain" the dma
1638 * will have occurred (can't 100% guarantee, but should be many
1639 * decimals of 9s, with this ordering), given how much else happens
1642 dd->f_sendctrl(dd->pport, QIB_SENDCTRL_AVAIL_BLIP);
1645 * Now allocate the rcvhdr Q and eager TIDs; skip the TID
1646 * array for time being. If rcd->ctxt > chip-supported,
1647 * we need to do extra stuff here to handle by handling overflow
1648 * through ctxt 0, someday
1650 ret = qib_create_rcvhdrq(dd, rcd);
1652 ret = qib_setup_eagerbufs(rcd);
1656 rcd->tidcursor = 0; /* start at beginning after open */
1658 /* initialize poll variables... */
1660 rcd->urgent_poll = 0;
1663 * Now enable the ctxt for receive.
1664 * For chips that are set to DMA the tail register to memory
1665 * when they change (and when the update bit transitions from
1666 * 0 to 1. So for those chips, we turn it off and then back on.
1667 * This will (very briefly) affect any other open ctxts, but the
1668 * duration is very short, and therefore isn't an issue. We
1669 * explicitly set the in-memory tail copy to 0 beforehand, so we
1670 * don't have to wait to be sure the DMA update has happened
1671 * (chip resets head/tail to 0 on transition to enable).
1673 if (rcd->rcvhdrtail_kvaddr)
1674 qib_clear_rcvhdrtail(rcd);
1676 dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_ENB | QIB_RCVCTRL_TIDFLOW_ENB,
1679 /* Notify any waiting slaves */
1680 if (rcd->subctxt_cnt) {
1681 clear_bit(QIB_CTXT_MASTER_UNINIT, &rcd->flag);
1682 wake_up(&rcd->wait);
1687 qib_chg_pioavailkernel(dd, rcd->pio_base, rcd->piocnt,
1688 TXCHK_CHG_TYPE_KERN, rcd);
1694 * unlock_exptid - unlock any expected TID entries context still had in use
1697 * We don't actually update the chip here, because we do a bulk update
1698 * below, using f_clear_tids.
1700 static void unlock_expected_tids(struct qib_ctxtdata *rcd)
1702 struct qib_devdata *dd = rcd->dd;
1703 int ctxt_tidbase = rcd->ctxt * dd->rcvtidcnt;
1704 int i, cnt = 0, maxtid = ctxt_tidbase + dd->rcvtidcnt;
1706 for (i = ctxt_tidbase; i < maxtid; i++) {
1707 struct page *p = dd->pageshadow[i];
1713 phys = dd->physshadow[i];
1714 dd->physshadow[i] = dd->tidinvalid;
1715 dd->pageshadow[i] = NULL;
1716 pci_unmap_page(dd->pcidev, phys, PAGE_SIZE,
1717 PCI_DMA_FROMDEVICE);
1718 qib_release_user_pages(&p, 1);
1723 static int qib_close(struct inode *in, struct file *fp)
1726 struct qib_filedata *fd;
1727 struct qib_ctxtdata *rcd;
1728 struct qib_devdata *dd;
1729 unsigned long flags;
1733 mutex_lock(&qib_mutex);
1735 fd = fp->private_data;
1736 fp->private_data = NULL;
1739 mutex_unlock(&qib_mutex);
1745 /* ensure all pio buffer writes in progress are flushed */
1748 /* drain user sdma queue */
1750 qib_user_sdma_queue_drain(rcd->ppd, fd->pq);
1751 qib_user_sdma_queue_destroy(fd->pq);
1754 if (fd->rec_cpu_num != -1)
1755 __clear_bit(fd->rec_cpu_num, qib_cpulist);
1759 * XXX If the master closes the context before the slave(s),
1760 * revoke the mmap for the eager receive queue so
1761 * the slave(s) don't wait for receive data forever.
1763 rcd->active_slaves &= ~(1 << fd->subctxt);
1764 rcd->subpid[fd->subctxt] = 0;
1765 mutex_unlock(&qib_mutex);
1769 /* early; no interrupt users after this */
1770 spin_lock_irqsave(&dd->uctxt_lock, flags);
1772 dd->rcd[ctxt] = NULL;
1775 spin_unlock_irqrestore(&dd->uctxt_lock, flags);
1777 if (rcd->rcvwait_to || rcd->piowait_to ||
1778 rcd->rcvnowait || rcd->pionowait) {
1779 rcd->rcvwait_to = 0;
1780 rcd->piowait_to = 0;
1788 /* atomically clear receive enable ctxt and intr avail. */
1789 dd->f_rcvctrl(rcd->ppd, QIB_RCVCTRL_CTXT_DIS |
1790 QIB_RCVCTRL_INTRAVAIL_DIS, ctxt);
1792 /* clean up the pkeys for this ctxt user */
1793 qib_clean_part_key(rcd, dd);
1794 qib_disarm_piobufs(dd, rcd->pio_base, rcd->piocnt);
1795 qib_chg_pioavailkernel(dd, rcd->pio_base,
1796 rcd->piocnt, TXCHK_CHG_TYPE_KERN, NULL);
1798 dd->f_clear_tids(dd, rcd);
1801 unlock_expected_tids(rcd);
1802 qib_stats.sps_ctxts--;
1806 mutex_unlock(&qib_mutex);
1807 qib_free_ctxtdata(dd, rcd); /* after releasing the mutex */
1814 static int qib_ctxt_info(struct file *fp, struct qib_ctxt_info __user *uinfo)
1816 struct qib_ctxt_info info;
1819 struct qib_ctxtdata *rcd = ctxt_fp(fp);
1820 struct qib_filedata *fd;
1822 fd = fp->private_data;
1824 info.num_active = qib_count_active_units();
1825 info.unit = rcd->dd->unit;
1826 info.port = rcd->ppd->port;
1827 info.ctxt = rcd->ctxt;
1828 info.subctxt = subctxt_fp(fp);
1829 /* Number of user ctxts available for this device. */
1830 info.num_ctxts = rcd->dd->cfgctxts - rcd->dd->first_user_ctxt;
1831 info.num_subctxts = rcd->subctxt_cnt;
1832 info.rec_cpu = fd->rec_cpu_num;
1835 if (copy_to_user(uinfo, &info, sz)) {
1845 static int qib_sdma_get_inflight(struct qib_user_sdma_queue *pq,
1846 u32 __user *inflightp)
1848 const u32 val = qib_user_sdma_inflight_counter(pq);
1850 if (put_user(val, inflightp))
1856 static int qib_sdma_get_complete(struct qib_pportdata *ppd,
1857 struct qib_user_sdma_queue *pq,
1858 u32 __user *completep)
1866 err = qib_user_sdma_make_progress(ppd, pq);
1870 val = qib_user_sdma_complete_counter(pq);
1871 if (put_user(val, completep))
1877 static int disarm_req_delay(struct qib_ctxtdata *rcd)
1881 if (!usable(rcd->ppd)) {
1884 * if link is down, or otherwise not usable, delay
1885 * the caller up to 30 seconds, so we don't thrash
1886 * in trying to get the chip back to ACTIVE, and
1887 * set flag so they make the call again.
1889 if (rcd->user_event_mask) {
1891 * subctxt_cnt is 0 if not shared, so do base
1892 * separately, first, then remaining subctxt, if any
1894 set_bit(_QIB_EVENT_DISARM_BUFS_BIT,
1895 &rcd->user_event_mask[0]);
1896 for (i = 1; i < rcd->subctxt_cnt; i++)
1897 set_bit(_QIB_EVENT_DISARM_BUFS_BIT,
1898 &rcd->user_event_mask[i]);
1900 for (i = 0; !usable(rcd->ppd) && i < 300; i++)
1908 * Find all user contexts in use, and set the specified bit in their
1910 * See also find_ctxt() for a similar use, that is specific to send buffers.
1912 int qib_set_uevent_bits(struct qib_pportdata *ppd, const int evtbit)
1914 struct qib_ctxtdata *rcd;
1917 unsigned long flags;
1919 spin_lock_irqsave(&ppd->dd->uctxt_lock, flags);
1920 for (ctxt = ppd->dd->first_user_ctxt; ctxt < ppd->dd->cfgctxts;
1922 rcd = ppd->dd->rcd[ctxt];
1925 if (rcd->user_event_mask) {
1928 * subctxt_cnt is 0 if not shared, so do base
1929 * separately, first, then remaining subctxt, if any
1931 set_bit(evtbit, &rcd->user_event_mask[0]);
1932 for (i = 1; i < rcd->subctxt_cnt; i++)
1933 set_bit(evtbit, &rcd->user_event_mask[i]);
1938 spin_unlock_irqrestore(&ppd->dd->uctxt_lock, flags);
1944 * clear the event notifier events for this context.
1945 * For the DISARM_BUFS case, we also take action (this obsoletes
1946 * the older QIB_CMD_DISARM_BUFS, but we keep it for backwards
1948 * Other bits don't currently require actions, just atomically clear.
1949 * User process then performs actions appropriate to bit having been
1950 * set, if desired, and checks again in future.
1952 static int qib_user_event_ack(struct qib_ctxtdata *rcd, int subctxt,
1953 unsigned long events)
1957 for (i = 0; i <= _QIB_MAX_EVENT_BIT; i++) {
1958 if (!test_bit(i, &events))
1960 if (i == _QIB_EVENT_DISARM_BUFS_BIT) {
1961 (void)qib_disarm_piobufs_ifneeded(rcd);
1962 ret = disarm_req_delay(rcd);
1964 clear_bit(i, &rcd->user_event_mask[subctxt]);
1969 static ssize_t qib_write(struct file *fp, const char __user *data,
1970 size_t count, loff_t *off)
1972 const struct qib_cmd __user *ucmd;
1973 struct qib_ctxtdata *rcd;
1974 const void __user *src;
1975 size_t consumed, copy = 0;
1980 if (count < sizeof(cmd.type)) {
1985 ucmd = (const struct qib_cmd __user *) data;
1987 if (copy_from_user(&cmd.type, &ucmd->type, sizeof(cmd.type))) {
1992 consumed = sizeof(cmd.type);
1995 case QIB_CMD_ASSIGN_CTXT:
1996 case QIB_CMD_USER_INIT:
1997 copy = sizeof(cmd.cmd.user_info);
1998 dest = &cmd.cmd.user_info;
1999 src = &ucmd->cmd.user_info;
2002 case QIB_CMD_RECV_CTRL:
2003 copy = sizeof(cmd.cmd.recv_ctrl);
2004 dest = &cmd.cmd.recv_ctrl;
2005 src = &ucmd->cmd.recv_ctrl;
2008 case QIB_CMD_CTXT_INFO:
2009 copy = sizeof(cmd.cmd.ctxt_info);
2010 dest = &cmd.cmd.ctxt_info;
2011 src = &ucmd->cmd.ctxt_info;
2014 case QIB_CMD_TID_UPDATE:
2015 case QIB_CMD_TID_FREE:
2016 copy = sizeof(cmd.cmd.tid_info);
2017 dest = &cmd.cmd.tid_info;
2018 src = &ucmd->cmd.tid_info;
2021 case QIB_CMD_SET_PART_KEY:
2022 copy = sizeof(cmd.cmd.part_key);
2023 dest = &cmd.cmd.part_key;
2024 src = &ucmd->cmd.part_key;
2027 case QIB_CMD_DISARM_BUFS:
2028 case QIB_CMD_PIOAVAILUPD: /* force an update of PIOAvail reg */
2034 case QIB_CMD_POLL_TYPE:
2035 copy = sizeof(cmd.cmd.poll_type);
2036 dest = &cmd.cmd.poll_type;
2037 src = &ucmd->cmd.poll_type;
2040 case QIB_CMD_ARMLAUNCH_CTRL:
2041 copy = sizeof(cmd.cmd.armlaunch_ctrl);
2042 dest = &cmd.cmd.armlaunch_ctrl;
2043 src = &ucmd->cmd.armlaunch_ctrl;
2046 case QIB_CMD_SDMA_INFLIGHT:
2047 copy = sizeof(cmd.cmd.sdma_inflight);
2048 dest = &cmd.cmd.sdma_inflight;
2049 src = &ucmd->cmd.sdma_inflight;
2052 case QIB_CMD_SDMA_COMPLETE:
2053 copy = sizeof(cmd.cmd.sdma_complete);
2054 dest = &cmd.cmd.sdma_complete;
2055 src = &ucmd->cmd.sdma_complete;
2058 case QIB_CMD_ACK_EVENT:
2059 copy = sizeof(cmd.cmd.event_mask);
2060 dest = &cmd.cmd.event_mask;
2061 src = &ucmd->cmd.event_mask;
2070 if ((count - consumed) < copy) {
2074 if (copy_from_user(dest, src, copy)) {
2082 if (!rcd && cmd.type != QIB_CMD_ASSIGN_CTXT) {
2088 case QIB_CMD_ASSIGN_CTXT:
2089 ret = qib_assign_ctxt(fp, &cmd.cmd.user_info);
2094 case QIB_CMD_USER_INIT:
2095 ret = qib_do_user_init(fp, &cmd.cmd.user_info);
2098 ret = qib_get_base_info(fp, (void __user *) (unsigned long)
2099 cmd.cmd.user_info.spu_base_info,
2100 cmd.cmd.user_info.spu_base_info_size);
2103 case QIB_CMD_RECV_CTRL:
2104 ret = qib_manage_rcvq(rcd, subctxt_fp(fp), cmd.cmd.recv_ctrl);
2107 case QIB_CMD_CTXT_INFO:
2108 ret = qib_ctxt_info(fp, (struct qib_ctxt_info __user *)
2109 (unsigned long) cmd.cmd.ctxt_info);
2112 case QIB_CMD_TID_UPDATE:
2113 ret = qib_tid_update(rcd, fp, &cmd.cmd.tid_info);
2116 case QIB_CMD_TID_FREE:
2117 ret = qib_tid_free(rcd, subctxt_fp(fp), &cmd.cmd.tid_info);
2120 case QIB_CMD_SET_PART_KEY:
2121 ret = qib_set_part_key(rcd, cmd.cmd.part_key);
2124 case QIB_CMD_DISARM_BUFS:
2125 (void)qib_disarm_piobufs_ifneeded(rcd);
2126 ret = disarm_req_delay(rcd);
2129 case QIB_CMD_PIOAVAILUPD:
2130 qib_force_pio_avail_update(rcd->dd);
2133 case QIB_CMD_POLL_TYPE:
2134 rcd->poll_type = cmd.cmd.poll_type;
2137 case QIB_CMD_ARMLAUNCH_CTRL:
2138 rcd->dd->f_set_armlaunch(rcd->dd, cmd.cmd.armlaunch_ctrl);
2141 case QIB_CMD_SDMA_INFLIGHT:
2142 ret = qib_sdma_get_inflight(user_sdma_queue_fp(fp),
2143 (u32 __user *) (unsigned long)
2144 cmd.cmd.sdma_inflight);
2147 case QIB_CMD_SDMA_COMPLETE:
2148 ret = qib_sdma_get_complete(rcd->ppd,
2149 user_sdma_queue_fp(fp),
2150 (u32 __user *) (unsigned long)
2151 cmd.cmd.sdma_complete);
2154 case QIB_CMD_ACK_EVENT:
2155 ret = qib_user_event_ack(rcd, subctxt_fp(fp),
2156 cmd.cmd.event_mask);
2167 static ssize_t qib_aio_write(struct kiocb *iocb, const struct iovec *iov,
2168 unsigned long dim, loff_t off)
2170 struct qib_filedata *fp = iocb->ki_filp->private_data;
2171 struct qib_ctxtdata *rcd = ctxt_fp(iocb->ki_filp);
2172 struct qib_user_sdma_queue *pq = fp->pq;
2177 return qib_user_sdma_writev(rcd, pq, iov, dim);
2180 static struct class *qib_class;
2181 static dev_t qib_dev;
2183 int qib_cdev_init(int minor, const char *name,
2184 const struct file_operations *fops,
2185 struct cdev **cdevp, struct device **devp)
2187 const dev_t dev = MKDEV(MAJOR(qib_dev), minor);
2189 struct device *device = NULL;
2192 cdev = cdev_alloc();
2194 pr_err("Could not allocate cdev for minor %d, %s\n",
2200 cdev->owner = THIS_MODULE;
2202 kobject_set_name(&cdev->kobj, name);
2204 ret = cdev_add(cdev, dev, 1);
2206 pr_err("Could not add cdev for minor %d, %s (err %d)\n",
2211 device = device_create(qib_class, NULL, dev, NULL, name);
2212 if (!IS_ERR(device))
2214 ret = PTR_ERR(device);
2216 pr_err("Could not create device for minor %d, %s (err %d)\n",
2227 void qib_cdev_cleanup(struct cdev **cdevp, struct device **devp)
2229 struct device *device = *devp;
2232 device_unregister(device);
2242 static struct cdev *wildcard_cdev;
2243 static struct device *wildcard_device;
2245 int __init qib_dev_init(void)
2249 ret = alloc_chrdev_region(&qib_dev, 0, QIB_NMINORS, QIB_DRV_NAME);
2251 pr_err("Could not allocate chrdev region (err %d)\n", -ret);
2255 qib_class = class_create(THIS_MODULE, "ipath");
2256 if (IS_ERR(qib_class)) {
2257 ret = PTR_ERR(qib_class);
2258 pr_err("Could not create device class (err %d)\n", -ret);
2259 unregister_chrdev_region(qib_dev, QIB_NMINORS);
2266 void qib_dev_cleanup(void)
2269 class_destroy(qib_class);
2273 unregister_chrdev_region(qib_dev, QIB_NMINORS);
2276 static atomic_t user_count = ATOMIC_INIT(0);
2278 static void qib_user_remove(struct qib_devdata *dd)
2280 if (atomic_dec_return(&user_count) == 0)
2281 qib_cdev_cleanup(&wildcard_cdev, &wildcard_device);
2283 qib_cdev_cleanup(&dd->user_cdev, &dd->user_device);
2286 static int qib_user_add(struct qib_devdata *dd)
2291 if (atomic_inc_return(&user_count) == 1) {
2292 ret = qib_cdev_init(0, "ipath", &qib_file_ops,
2293 &wildcard_cdev, &wildcard_device);
2298 snprintf(name, sizeof(name), "ipath%d", dd->unit);
2299 ret = qib_cdev_init(dd->unit + 1, name, &qib_file_ops,
2300 &dd->user_cdev, &dd->user_device);
2302 qib_user_remove(dd);
2308 * Create per-unit files in /dev
2310 int qib_device_create(struct qib_devdata *dd)
2314 r = qib_user_add(dd);
2315 ret = qib_diag_add(dd);
2322 * Remove per-unit files in /dev
2323 * void, core kernel returns no errors for this stuff
2325 void qib_device_remove(struct qib_devdata *dd)
2327 qib_user_remove(dd);
2328 qib_diag_remove(dd);