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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/drivers/infiniband/hw/hfi1/user_exp_rcv.c
....@@ -65,17 +65,24 @@
6565 static bool tid_rb_invalidate(struct mmu_interval_notifier *mni,
6666 			      const struct mmu_notifier_range *range,
6767 			      unsigned long cur_seq);
68
+static bool tid_cover_invalidate(struct mmu_interval_notifier *mni,
69
+			         const struct mmu_notifier_range *range,
70
+			         unsigned long cur_seq);
6871 static int program_rcvarray(struct hfi1_filedata *fd, struct tid_user_buf *,
6972 			    struct tid_group *grp,
7073 			    unsigned int start, u16 count,
7174 			    u32 *tidlist, unsigned int *tididx,
7275 			    unsigned int *pmapped);
73
-static int unprogram_rcvarray(struct hfi1_filedata *fd, u32 tidinfo,
74
-			      struct tid_group **grp);
76
+static int unprogram_rcvarray(struct hfi1_filedata *fd, u32 tidinfo);
77
+static void __clear_tid_node(struct hfi1_filedata *fd,
78
+			     struct tid_rb_node *node);
7579 static void clear_tid_node(struct hfi1_filedata *fd, struct tid_rb_node *node);
7680 
7781 static const struct mmu_interval_notifier_ops tid_mn_ops = {
7882 	.invalidate = tid_rb_invalidate,
83
+};
84
+static const struct mmu_interval_notifier_ops tid_cover_ops = {
85
+	.invalidate = tid_cover_invalidate,
7986 };
8087 
8188 /*
....@@ -195,15 +202,10 @@
195202 static int pin_rcv_pages(struct hfi1_filedata *fd, struct tid_user_buf *tidbuf)
196203 {
197204 	int pinned;
198
-	unsigned int npages;
205
+	unsigned int npages = tidbuf->npages;
199206 	unsigned long vaddr = tidbuf->vaddr;
200207 	struct page **pages = NULL;
201208 	struct hfi1_devdata *dd = fd->uctxt->dd;
202
-
203
-	/* Get the number of pages the user buffer spans */
204
-	npages = num_user_pages(vaddr, tidbuf->length);
205
-	if (!npages)
206
-		return -EINVAL;
207209 
208210 	if (npages > fd->uctxt->expected_count) {
209211 		dd_dev_err(dd, "Expected buffer too big\n");
....@@ -231,7 +233,6 @@
231233 		return pinned;
232234 	}
233235 	tidbuf->pages = pages;
234
-	tidbuf->npages = npages;
235236 	fd->tid_n_pinned += pinned;
236237 	return pinned;
237238 }
....@@ -295,53 +296,66 @@
295296 		tididx = 0, mapped, mapped_pages = 0;
296297 	u32 *tidlist = NULL;
297298 	struct tid_user_buf *tidbuf;
299
+	unsigned long mmu_seq = 0;
298300 
299301 	if (!PAGE_ALIGNED(tinfo->vaddr))
302
+		return -EINVAL;
303
+	if (tinfo->length == 0)
300304 		return -EINVAL;
301305 
302306 	tidbuf = kzalloc(sizeof(*tidbuf), GFP_KERNEL);
303307 	if (!tidbuf)
304308 		return -ENOMEM;
305309 
310
+	mutex_init(&tidbuf->cover_mutex);
306311 	tidbuf->vaddr = tinfo->vaddr;
307312 	tidbuf->length = tinfo->length;
313
+	tidbuf->npages = num_user_pages(tidbuf->vaddr, tidbuf->length);
308314 	tidbuf->psets = kcalloc(uctxt->expected_count, sizeof(*tidbuf->psets),
309315 				GFP_KERNEL);
310316 	if (!tidbuf->psets) {
311
-		kfree(tidbuf);
312
-		return -ENOMEM;
317
+		ret = -ENOMEM;
318
+		goto fail_release_mem;
319
+	}
320
+
321
+	if (fd->use_mn) {
322
+		ret = mmu_interval_notifier_insert(
323
+			&tidbuf->notifier, current->mm,
324
+			tidbuf->vaddr, tidbuf->npages * PAGE_SIZE,
325
+			&tid_cover_ops);
326
+		if (ret)
327
+			goto fail_release_mem;
328
+		mmu_seq = mmu_interval_read_begin(&tidbuf->notifier);
313329 	}
314330 
315331 	pinned = pin_rcv_pages(fd, tidbuf);
316332 	if (pinned <= 0) {
317
-		kfree(tidbuf->psets);
318
-		kfree(tidbuf);
319
-		return pinned;
333
+		ret = (pinned < 0) ? pinned : -ENOSPC;
334
+		goto fail_unpin;
320335 	}
321336 
322337 	/* Find sets of physically contiguous pages */
323338 	tidbuf->n_psets = find_phys_blocks(tidbuf, pinned);
324339 
325
-	/*
326
-	 * We don't need to access this under a lock since tid_used is per
327
-	 * process and the same process cannot be in hfi1_user_exp_rcv_clear()
328
-	 * and hfi1_user_exp_rcv_setup() at the same time.
329
-	 */
340
+	/* Reserve the number of expected tids to be used. */
330341 	spin_lock(&fd->tid_lock);
331342 	if (fd->tid_used + tidbuf->n_psets > fd->tid_limit)
332343 		pageset_count = fd->tid_limit - fd->tid_used;
333344 	else
334345 		pageset_count = tidbuf->n_psets;
346
+	fd->tid_used += pageset_count;
335347 	spin_unlock(&fd->tid_lock);
336348 
337
-	if (!pageset_count)
338
-		goto bail;
349
+	if (!pageset_count) {
350
+		ret = -ENOSPC;
351
+		goto fail_unreserve;
352
+	}
339353 
340354 	ngroups = pageset_count / dd->rcv_entries.group_size;
341355 	tidlist = kcalloc(pageset_count, sizeof(*tidlist), GFP_KERNEL);
342356 	if (!tidlist) {
343357 		ret = -ENOMEM;
344
-		goto nomem;
358
+		goto fail_unreserve;
345359 	}
346360 
347361 	tididx = 0;
....@@ -437,43 +451,78 @@
437451 	}
438452 unlock:
439453 	mutex_unlock(&uctxt->exp_mutex);
440
-nomem:
441454 	hfi1_cdbg(TID, "total mapped: tidpairs:%u pages:%u (%d)", tididx,
442455 		  mapped_pages, ret);
443
-	if (tididx) {
444
-		spin_lock(&fd->tid_lock);
445
-		fd->tid_used += tididx;
446
-		spin_unlock(&fd->tid_lock);
447
-		tinfo->tidcnt = tididx;
448
-		tinfo->length = mapped_pages * PAGE_SIZE;
449456 
450
-		if (copy_to_user(u64_to_user_ptr(tinfo->tidlist),
451
-				 tidlist, sizeof(tidlist[0]) * tididx)) {
452
-			/*
453
-			 * On failure to copy to the user level, we need to undo
454
-			 * everything done so far so we don't leak resources.
455
-			 */
456
-			tinfo->tidlist = (unsigned long)&tidlist;
457
-			hfi1_user_exp_rcv_clear(fd, tinfo);
458
-			tinfo->tidlist = 0;
459
-			ret = -EFAULT;
460
-			goto bail;
457
+	/* fail if nothing was programmed, set error if none provided */
458
+	if (tididx == 0) {
459
+		if (ret >= 0)
460
+			ret = -ENOSPC;
461
+		goto fail_unreserve;
462
+	}
463
+
464
+	/* adjust reserved tid_used to actual count */
465
+	spin_lock(&fd->tid_lock);
466
+	fd->tid_used -= pageset_count - tididx;
467
+	spin_unlock(&fd->tid_lock);
468
+
469
+	/* unpin all pages not covered by a TID */
470
+	unpin_rcv_pages(fd, tidbuf, NULL, mapped_pages, pinned - mapped_pages,
471
+			false);
472
+
473
+	if (fd->use_mn) {
474
+		/* check for an invalidate during setup */
475
+		bool fail = false;
476
+
477
+		mutex_lock(&tidbuf->cover_mutex);
478
+		fail = mmu_interval_read_retry(&tidbuf->notifier, mmu_seq);
479
+		mutex_unlock(&tidbuf->cover_mutex);
480
+
481
+		if (fail) {
482
+			ret = -EBUSY;
483
+			goto fail_unprogram;
461484 		}
462485 	}
463486 
464
-	/*
465
-	 * If not everything was mapped (due to insufficient RcvArray entries,
466
-	 * for example), unpin all unmapped pages so we can pin them nex time.
467
-	 */
468
-	if (mapped_pages != pinned)
469
-		unpin_rcv_pages(fd, tidbuf, NULL, mapped_pages,
470
-				(pinned - mapped_pages), false);
471
-bail:
472
-	kfree(tidbuf->psets);
473
-	kfree(tidlist);
487
+	tinfo->tidcnt = tididx;
488
+	tinfo->length = mapped_pages * PAGE_SIZE;
489
+
490
+	if (copy_to_user(u64_to_user_ptr(tinfo->tidlist),
491
+			 tidlist, sizeof(tidlist[0]) * tididx)) {
492
+		ret = -EFAULT;
493
+		goto fail_unprogram;
494
+	}
495
+
496
+	if (fd->use_mn)
497
+		mmu_interval_notifier_remove(&tidbuf->notifier);
474498 	kfree(tidbuf->pages);
499
+	kfree(tidbuf->psets);
475500 	kfree(tidbuf);
476
-	return ret > 0 ? 0 : ret;
501
+	kfree(tidlist);
502
+	return 0;
503
+
504
+fail_unprogram:
505
+	/* unprogram, unmap, and unpin all allocated TIDs */
506
+	tinfo->tidlist = (unsigned long)tidlist;
507
+	hfi1_user_exp_rcv_clear(fd, tinfo);
508
+	tinfo->tidlist = 0;
509
+	pinned = 0;		/* nothing left to unpin */
510
+	pageset_count = 0;	/* nothing left reserved */
511
+fail_unreserve:
512
+	spin_lock(&fd->tid_lock);
513
+	fd->tid_used -= pageset_count;
514
+	spin_unlock(&fd->tid_lock);
515
+fail_unpin:
516
+	if (fd->use_mn)
517
+		mmu_interval_notifier_remove(&tidbuf->notifier);
518
+	if (pinned > 0)
519
+		unpin_rcv_pages(fd, tidbuf, NULL, 0, pinned, false);
520
+fail_release_mem:
521
+	kfree(tidbuf->pages);
522
+	kfree(tidbuf->psets);
523
+	kfree(tidbuf);
524
+	kfree(tidlist);
525
+	return ret;
477526 }
478527 
479528 int hfi1_user_exp_rcv_clear(struct hfi1_filedata *fd,
....@@ -494,7 +543,7 @@
494543 
495544 	mutex_lock(&uctxt->exp_mutex);
496545 	for (tididx = 0; tididx < tinfo->tidcnt; tididx++) {
497
-		ret = unprogram_rcvarray(fd, tidinfo[tididx], NULL);
546
+		ret = unprogram_rcvarray(fd, tidinfo[tididx]);
498547 		if (ret) {
499548 			hfi1_cdbg(TID, "Failed to unprogram rcv array %d",
500549 				  ret);
....@@ -750,6 +799,7 @@
750799 	}
751800 
752801 	node->fdata = fd;
802
+	mutex_init(&node->invalidate_mutex);
753803 	node->phys = page_to_phys(pages[0]);
754804 	node->npages = npages;
755805 	node->rcventry = rcventry;
....@@ -765,11 +815,6 @@
765815 			&tid_mn_ops);
766816 		if (ret)
767817 			goto out_unmap;
768
-		/*
769
-		 * FIXME: This is in the wrong order, the notifier should be
770
-		 * established before the pages are pinned by pin_rcv_pages.
771
-		 */
772
-		mmu_interval_read_begin(&node->notifier);
773818 	}
774819 	fd->entry_to_rb[node->rcventry - uctxt->expected_base] = node;
775820 
....@@ -789,8 +834,7 @@
789834 	return -EFAULT;
790835 }
791836 
792
-static int unprogram_rcvarray(struct hfi1_filedata *fd, u32 tidinfo,
793
-			      struct tid_group **grp)
837
+static int unprogram_rcvarray(struct hfi1_filedata *fd, u32 tidinfo)
794838 {
795839 	struct hfi1_ctxtdata *uctxt = fd->uctxt;
796840 	struct hfi1_devdata *dd = uctxt->dd;
....@@ -813,9 +857,6 @@
813857 	if (!node || node->rcventry != (uctxt->expected_base + rcventry))
814858 		return -EBADF;
815859 
816
-	if (grp)
817
-		*grp = node->grp;
818
-
819860 	if (fd->use_mn)
820861 		mmu_interval_notifier_remove(&node->notifier);
821862 	cacheless_tid_rb_remove(fd, node);
....@@ -823,23 +864,34 @@
823864 	return 0;
824865 }
825866 
826
-static void clear_tid_node(struct hfi1_filedata *fd, struct tid_rb_node *node)
867
+static void __clear_tid_node(struct hfi1_filedata *fd, struct tid_rb_node *node)
827868 {
828869 	struct hfi1_ctxtdata *uctxt = fd->uctxt;
829870 	struct hfi1_devdata *dd = uctxt->dd;
871
+
872
+	mutex_lock(&node->invalidate_mutex);
873
+	if (node->freed)
874
+		goto done;
875
+	node->freed = true;
830876 
831877 	trace_hfi1_exp_tid_unreg(uctxt->ctxt, fd->subctxt, node->rcventry,
832878 				 node->npages,
833879 				 node->notifier.interval_tree.start, node->phys,
834880 				 node->dma_addr);
835881 
836
-	/*
837
-	 * Make sure device has seen the write before we unpin the
838
-	 * pages.
839
-	 */
882
+	/* Make sure device has seen the write before pages are unpinned */
840883 	hfi1_put_tid(dd, node->rcventry, PT_INVALID_FLUSH, 0, 0);
841884 
842885 	unpin_rcv_pages(fd, NULL, node, 0, node->npages, true);
886
+done:
887
+	mutex_unlock(&node->invalidate_mutex);
888
+}
889
+
890
+static void clear_tid_node(struct hfi1_filedata *fd, struct tid_rb_node *node)
891
+{
892
+	struct hfi1_ctxtdata *uctxt = fd->uctxt;
893
+
894
+	__clear_tid_node(fd, node);
843895 
844896 	node->grp->used--;
845897 	node->grp->map &= ~(1 << (node->rcventry - node->grp->base));
....@@ -898,10 +950,16 @@
898950 	if (node->freed)
899951 		return true;
900952 
953
+	/* take action only if unmapping */
954
+	if (range->event != MMU_NOTIFY_UNMAP)
955
+		return true;
956
+
901957 	trace_hfi1_exp_tid_inval(uctxt->ctxt, fdata->subctxt,
902958 				 node->notifier.interval_tree.start,
903959 				 node->rcventry, node->npages, node->dma_addr);
904
-	node->freed = true;
960
+
961
+	/* clear the hardware rcvarray entry */
962
+	__clear_tid_node(fdata, node);
905963 
906964 	spin_lock(&fdata->invalid_lock);
907965 	if (fdata->invalid_tid_idx < uctxt->expected_count) {
....@@ -931,6 +989,23 @@
931989 	return true;
932990 }
933991 
992
+static bool tid_cover_invalidate(struct mmu_interval_notifier *mni,
993
+			         const struct mmu_notifier_range *range,
994
+			         unsigned long cur_seq)
995
+{
996
+	struct tid_user_buf *tidbuf =
997
+		container_of(mni, struct tid_user_buf, notifier);
998
+
999
+	/* take action only if unmapping */
1000
+	if (range->event == MMU_NOTIFY_UNMAP) {
1001
+		mutex_lock(&tidbuf->cover_mutex);
1002
+		mmu_interval_set_seq(mni, cur_seq);
1003
+		mutex_unlock(&tidbuf->cover_mutex);
1004
+	}
1005
+
1006
+	return true;
1007
+}
1008
+
9341009 static void cacheless_tid_rb_remove(struct hfi1_filedata *fdata,
9351010 				    struct tid_rb_node *tnode)
9361011 {