Re: [PATCH 2/3] DMA mapping: Move SME handling to x86-specific files

From: kbuild test robot
Date: Fri Jul 19 2019 - 05:06:14 EST

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In reply to: Thiago Jung Bauermann: "Re: [PATCH 2/3] DMA mapping: Move SME handling to x86-specific files"
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Hi Thiago,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.2 next-20190718]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Thiago-Jung-Bauermann/Remove-x86-specific-code-from-generic-headers/20190715-063006
config: s390-allnoconfig (attached as .config)
compiler: s390-linux-gcc (GCC) 7.4.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.4.0 make.cross ARCH=s390

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

kernel/dma/swiotlb.c: In function 'swiotlb_tbl_map_single':
>> kernel/dma/swiotlb.c:461:6: error: implicit declaration of function 'mem_encrypt_active'; did you mean 'set_cpu_active'? [-Werror=implicit-function-declaration]
if (mem_encrypt_active())
^~~~~~~~~~~~~~~~~~
set_cpu_active
cc1: some warnings being treated as errors

vim +461 kernel/dma/swiotlb.c

1b548f667c1487d lib/swiotlb.c Jeremy Fitzhardinge 2008-12-16 442
e05ed4d1fad9e73 lib/swiotlb.c Alexander Duyck 2012-10-15 443 phys_addr_t swiotlb_tbl_map_single(struct device *hwdev,
e05ed4d1fad9e73 lib/swiotlb.c Alexander Duyck 2012-10-15 444 dma_addr_t tbl_dma_addr,
e05ed4d1fad9e73 lib/swiotlb.c Alexander Duyck 2012-10-15 445 phys_addr_t orig_addr, size_t size,
0443fa003fa199f lib/swiotlb.c Alexander Duyck 2016-11-02 446 enum dma_data_direction dir,
0443fa003fa199f lib/swiotlb.c Alexander Duyck 2016-11-02 447 unsigned long attrs)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 448 {
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 449 unsigned long flags;
e05ed4d1fad9e73 lib/swiotlb.c Alexander Duyck 2012-10-15 450 phys_addr_t tlb_addr;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 451 unsigned int nslots, stride, index, wrap;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 452 int i;
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 453 unsigned long mask;
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 454 unsigned long offset_slots;
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 455 unsigned long max_slots;
53b29c336830db4 kernel/dma/swiotlb.c Dongli Zhang 2019-04-12 456 unsigned long tmp_io_tlb_used;
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 457
ac2cbab21f318e1 lib/swiotlb.c Yinghai Lu 2013-01-24 458 if (no_iotlb_memory)
ac2cbab21f318e1 lib/swiotlb.c Yinghai Lu 2013-01-24 459 panic("Can not allocate SWIOTLB buffer earlier and can't now provide you with the DMA bounce buffer");
ac2cbab21f318e1 lib/swiotlb.c Yinghai Lu 2013-01-24 460
d7b417fa08d1187 lib/swiotlb.c Tom Lendacky 2017-10-20 @461 if (mem_encrypt_active())
aa4d0dc3e029b79 kernel/dma/swiotlb.c Thiago Jung Bauermann 2019-07-12 462 pr_warn_once("Memory encryption is active and system is using DMA bounce buffers\n");
648babb7078c631 lib/swiotlb.c Tom Lendacky 2017-07-17 463
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 464 mask = dma_get_seg_boundary(hwdev);
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 465
eb605a5754d050a lib/swiotlb.c FUJITA Tomonori 2010-05-10 466 tbl_dma_addr &= mask;
eb605a5754d050a lib/swiotlb.c FUJITA Tomonori 2010-05-10 467
eb605a5754d050a lib/swiotlb.c FUJITA Tomonori 2010-05-10 468 offset_slots = ALIGN(tbl_dma_addr, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
a5ddde4a558b3bd lib/swiotlb.c Ian Campbell 2008-12-16 469
a5ddde4a558b3bd lib/swiotlb.c Ian Campbell 2008-12-16 470 /*
a5ddde4a558b3bd lib/swiotlb.c Ian Campbell 2008-12-16 471 * Carefully handle integer overflow which can occur when mask == ~0UL.
a5ddde4a558b3bd lib/swiotlb.c Ian Campbell 2008-12-16 472 */
b15a3891c916f32 lib/swiotlb.c Jan Beulich 2008-03-13 473 max_slots = mask + 1
b15a3891c916f32 lib/swiotlb.c Jan Beulich 2008-03-13 474 ? ALIGN(mask + 1, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT
b15a3891c916f32 lib/swiotlb.c Jan Beulich 2008-03-13 475 : 1UL << (BITS_PER_LONG - IO_TLB_SHIFT);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 476
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 477 /*
602d9858f07c72e lib/swiotlb.c Nikita Yushchenko 2017-01-11 478 * For mappings greater than or equal to a page, we limit the stride
602d9858f07c72e lib/swiotlb.c Nikita Yushchenko 2017-01-11 479 * (and hence alignment) to a page size.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 480 */
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 481 nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
602d9858f07c72e lib/swiotlb.c Nikita Yushchenko 2017-01-11 482 if (size >= PAGE_SIZE)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 483 stride = (1 << (PAGE_SHIFT - IO_TLB_SHIFT));
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 484 else
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 485 stride = 1;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 486
34814545890db60 lib/swiotlb.c Eric Sesterhenn 2006-03-24 487 BUG_ON(!nslots);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 488
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 489 /*
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 490 * Find suitable number of IO TLB entries size that will fit this
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 491 * request and allocate a buffer from that IO TLB pool.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 492 */
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 493 spin_lock_irqsave(&io_tlb_lock, flags);
60513ed06a41049 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 494
60513ed06a41049 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 495 if (unlikely(nslots > io_tlb_nslabs - io_tlb_used))
60513ed06a41049 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 496 goto not_found;
60513ed06a41049 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 497
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 498 index = ALIGN(io_tlb_index, stride);
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 499 if (index >= io_tlb_nslabs)
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 500 index = 0;
b15a3891c916f32 lib/swiotlb.c Jan Beulich 2008-03-13 501 wrap = index;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 502
b15a3891c916f32 lib/swiotlb.c Jan Beulich 2008-03-13 503 do {
a8522509200b460 lib/swiotlb.c FUJITA Tomonori 2008-04-29 504 while (iommu_is_span_boundary(index, nslots, offset_slots,
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 505 max_slots)) {
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 506 index += stride;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 507 if (index >= io_tlb_nslabs)
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 508 index = 0;
b15a3891c916f32 lib/swiotlb.c Jan Beulich 2008-03-13 509 if (index == wrap)
b15a3891c916f32 lib/swiotlb.c Jan Beulich 2008-03-13 510 goto not_found;
681cc5cd3efbeaf lib/swiotlb.c FUJITA Tomonori 2008-02-04 511 }
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 512
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 513 /*
a7133a15587b892 lib/swiotlb.c Andrew Morton 2008-04-29 514 * If we find a slot that indicates we have 'nslots' number of
a7133a15587b892 lib/swiotlb.c Andrew Morton 2008-04-29 515 * contiguous buffers, we allocate the buffers from that slot
a7133a15587b892 lib/swiotlb.c Andrew Morton 2008-04-29 516 * and mark the entries as '0' indicating unavailable.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 517 */
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 518 if (io_tlb_list[index] >= nslots) {
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 519 int count = 0;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 520
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 521 for (i = index; i < (int) (index + nslots); i++)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 522 io_tlb_list[i] = 0;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 523 for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE - 1) && io_tlb_list[i]; i--)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 524 io_tlb_list[i] = ++count;
e05ed4d1fad9e73 lib/swiotlb.c Alexander Duyck 2012-10-15 525 tlb_addr = io_tlb_start + (index << IO_TLB_SHIFT);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 526
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 527 /*
a7133a15587b892 lib/swiotlb.c Andrew Morton 2008-04-29 528 * Update the indices to avoid searching in the next
a7133a15587b892 lib/swiotlb.c Andrew Morton 2008-04-29 529 * round.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 530 */
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 531 io_tlb_index = ((index + nslots) < io_tlb_nslabs
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 532 ? (index + nslots) : 0);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 533
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 534 goto found;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 535 }
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 536 index += stride;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 537 if (index >= io_tlb_nslabs)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 538 index = 0;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 539 } while (index != wrap);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 540
b15a3891c916f32 lib/swiotlb.c Jan Beulich 2008-03-13 541 not_found:
53b29c336830db4 kernel/dma/swiotlb.c Dongli Zhang 2019-04-12 542 tmp_io_tlb_used = io_tlb_used;
53b29c336830db4 kernel/dma/swiotlb.c Dongli Zhang 2019-04-12 543
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 544 spin_unlock_irqrestore(&io_tlb_lock, flags);
d0bc0c2a31c9500 lib/swiotlb.c Christian König 2018-01-04 545 if (!(attrs & DMA_ATTR_NO_WARN) && printk_ratelimit())
53b29c336830db4 kernel/dma/swiotlb.c Dongli Zhang 2019-04-12 546 dev_warn(hwdev, "swiotlb buffer is full (sz: %zd bytes), total %lu (slots), used %lu (slots)\n",
53b29c336830db4 kernel/dma/swiotlb.c Dongli Zhang 2019-04-12 547 size, io_tlb_nslabs, tmp_io_tlb_used);
b907e20508d0246 kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 548 return DMA_MAPPING_ERROR;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 549 found:
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 550 io_tlb_used += nslots;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 551 spin_unlock_irqrestore(&io_tlb_lock, flags);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 552
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 553 /*
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 554 * Save away the mapping from the original address to the DMA address.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 555 * This is needed when we sync the memory. Then we sync the buffer if
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 556 * needed.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 557 */
bc40ac66988a772 lib/swiotlb.c Becky Bruce 2008-12-22 558 for (i = 0; i < nslots; i++)
e05ed4d1fad9e73 lib/swiotlb.c Alexander Duyck 2012-10-15 559 io_tlb_orig_addr[index+i] = orig_addr + (i << IO_TLB_SHIFT);
0443fa003fa199f lib/swiotlb.c Alexander Duyck 2016-11-02 560 if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
0443fa003fa199f lib/swiotlb.c Alexander Duyck 2016-11-02 561 (dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
af51a9f1848ff50 lib/swiotlb.c Alexander Duyck 2012-10-15 562 swiotlb_bounce(orig_addr, tlb_addr, size, DMA_TO_DEVICE);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 563
e05ed4d1fad9e73 lib/swiotlb.c Alexander Duyck 2012-10-15 564 return tlb_addr;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 565 }
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 566
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 567 /*
d0c8ba40c6cc0fe lib/swiotlb.c Yisheng Xie 2018-05-07 568 * tlb_addr is the physical address of the bounce buffer to unmap.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 569 */
61ca08c3220032d lib/swiotlb.c Alexander Duyck 2012-10-15 570 void swiotlb_tbl_unmap_single(struct device *hwdev, phys_addr_t tlb_addr,
0443fa003fa199f lib/swiotlb.c Alexander Duyck 2016-11-02 571 size_t size, enum dma_data_direction dir,
0443fa003fa199f lib/swiotlb.c Alexander Duyck 2016-11-02 572 unsigned long attrs)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 573 {
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 574 unsigned long flags;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 575 int i, count, nslots = ALIGN(size, 1 << IO_TLB_SHIFT) >> IO_TLB_SHIFT;
61ca08c3220032d lib/swiotlb.c Alexander Duyck 2012-10-15 576 int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
61ca08c3220032d lib/swiotlb.c Alexander Duyck 2012-10-15 577 phys_addr_t orig_addr = io_tlb_orig_addr[index];
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 578
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 579 /*
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 580 * First, sync the memory before unmapping the entry
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 581 */
8e0629c1d4ce86c lib/swiotlb.c Jan Beulich 2014-06-02 582 if (orig_addr != INVALID_PHYS_ADDR &&
0443fa003fa199f lib/swiotlb.c Alexander Duyck 2016-11-02 583 !(attrs & DMA_ATTR_SKIP_CPU_SYNC) &&
8e0629c1d4ce86c lib/swiotlb.c Jan Beulich 2014-06-02 584 ((dir == DMA_FROM_DEVICE) || (dir == DMA_BIDIRECTIONAL)))
af51a9f1848ff50 lib/swiotlb.c Alexander Duyck 2012-10-15 585 swiotlb_bounce(orig_addr, tlb_addr, size, DMA_FROM_DEVICE);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 586
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 587 /*
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 588 * Return the buffer to the free list by setting the corresponding
af901ca181d92aa lib/swiotlb.c André Goddard Rosa 2009-11-14 589 * entries to indicate the number of contiguous entries available.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 590 * While returning the entries to the free list, we merge the entries
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 591 * with slots below and above the pool being returned.
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 592 */
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 593 spin_lock_irqsave(&io_tlb_lock, flags);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 594 {
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 595 count = ((index + nslots) < ALIGN(index + 1, IO_TLB_SEGSIZE) ?
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 596 io_tlb_list[index + nslots] : 0);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 597 /*
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 598 * Step 1: return the slots to the free list, merging the
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 599 * slots with superceeding slots
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 600 */
8e0629c1d4ce86c lib/swiotlb.c Jan Beulich 2014-06-02 601 for (i = index + nslots - 1; i >= index; i--) {
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 602 io_tlb_list[i] = ++count;
8e0629c1d4ce86c lib/swiotlb.c Jan Beulich 2014-06-02 603 io_tlb_orig_addr[i] = INVALID_PHYS_ADDR;
8e0629c1d4ce86c lib/swiotlb.c Jan Beulich 2014-06-02 604 }
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 605 /*
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 606 * Step 2: merge the returned slots with the preceding slots,
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 607 * if available (non zero)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 608 */
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 609 for (i = index - 1; (OFFSET(i, IO_TLB_SEGSIZE) != IO_TLB_SEGSIZE -1) && io_tlb_list[i]; i--)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 610 io_tlb_list[i] = ++count;
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 611
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 612 io_tlb_used -= nslots;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 613 }
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 614 spin_unlock_irqrestore(&io_tlb_lock, flags);
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 615 }
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 616
fbfda893eb570bb lib/swiotlb.c Alexander Duyck 2012-10-15 617 void swiotlb_tbl_sync_single(struct device *hwdev, phys_addr_t tlb_addr,
fbfda893eb570bb lib/swiotlb.c Alexander Duyck 2012-10-15 618 size_t size, enum dma_data_direction dir,
d7ef1533a90f432 lib/swiotlb.c Konrad Rzeszutek Wilk 2010-05-28 619 enum dma_sync_target target)
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 620 {
fbfda893eb570bb lib/swiotlb.c Alexander Duyck 2012-10-15 621 int index = (tlb_addr - io_tlb_start) >> IO_TLB_SHIFT;
fbfda893eb570bb lib/swiotlb.c Alexander Duyck 2012-10-15 622 phys_addr_t orig_addr = io_tlb_orig_addr[index];
bc40ac66988a772 lib/swiotlb.c Becky Bruce 2008-12-22 623
8e0629c1d4ce86c lib/swiotlb.c Jan Beulich 2014-06-02 624 if (orig_addr == INVALID_PHYS_ADDR)
8e0629c1d4ce86c lib/swiotlb.c Jan Beulich 2014-06-02 625 return;
fbfda893eb570bb lib/swiotlb.c Alexander Duyck 2012-10-15 626 orig_addr += (unsigned long)tlb_addr & ((1 << IO_TLB_SHIFT) - 1);
df336d1c7b6fd51 lib/swiotlb.c Keir Fraser 2007-07-21 627
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 628 switch (target) {
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 629 case SYNC_FOR_CPU:
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 630 if (likely(dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL))
af51a9f1848ff50 lib/swiotlb.c Alexander Duyck 2012-10-15 631 swiotlb_bounce(orig_addr, tlb_addr,
fbfda893eb570bb lib/swiotlb.c Alexander Duyck 2012-10-15 632 size, DMA_FROM_DEVICE);
34814545890db60 lib/swiotlb.c Eric Sesterhenn 2006-03-24 633 else
34814545890db60 lib/swiotlb.c Eric Sesterhenn 2006-03-24 634 BUG_ON(dir != DMA_TO_DEVICE);
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 635 break;
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 636 case SYNC_FOR_DEVICE:
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 637 if (likely(dir == DMA_TO_DEVICE || dir == DMA_BIDIRECTIONAL))
af51a9f1848ff50 lib/swiotlb.c Alexander Duyck 2012-10-15 638 swiotlb_bounce(orig_addr, tlb_addr,
fbfda893eb570bb lib/swiotlb.c Alexander Duyck 2012-10-15 639 size, DMA_TO_DEVICE);
34814545890db60 lib/swiotlb.c Eric Sesterhenn 2006-03-24 640 else
34814545890db60 lib/swiotlb.c Eric Sesterhenn 2006-03-24 641 BUG_ON(dir != DMA_FROM_DEVICE);
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 642 break;
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 643 default:
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 644 BUG();
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 645 }
de69e0f0b38a467 lib/swiotlb.c John W. Linville 2005-09-29 646 }
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 647
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 648 /*
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 649 * Create a swiotlb mapping for the buffer at @phys, and in case of DMAing
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 650 * to the device copy the data into it as well.
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 651 */
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 652 bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr,
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 653 size_t size, enum dma_data_direction dir, unsigned long attrs)
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 654 {
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 655 trace_swiotlb_bounced(dev, *dma_addr, size, swiotlb_force);
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 656
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 657 if (unlikely(swiotlb_force == SWIOTLB_NO_FORCE)) {
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 658 dev_warn_ratelimited(dev,
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 659 "Cannot do DMA to address %pa\n", phys);
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 660 return false;
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 661 }
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 662
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 663 /* Oh well, have to allocate and map a bounce buffer. */
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 664 *phys = swiotlb_tbl_map_single(dev, __phys_to_dma(dev, io_tlb_start),
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 665 *phys, size, dir, attrs);
b907e20508d0246 kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 666 if (*phys == DMA_MAPPING_ERROR)
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 667 return false;
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 668
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 669 /* Ensure that the address returned is DMA'ble */
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 670 *dma_addr = __phys_to_dma(dev, *phys);
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 671 if (unlikely(!dma_capable(dev, *dma_addr, size))) {
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 672 swiotlb_tbl_unmap_single(dev, *phys, size, dir,
c4dae366925f929 kernel/dma/swiotlb.c Christoph Hellwig 2018-08-20 673 attrs | DMA_ATTR_SKIP_CPU_SYNC);
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 674 return false;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 675 }
309df0c503c35fb lib/swiotlb.c Arthur Kepner 2008-04-29 676
55897af63091ebc kernel/dma/swiotlb.c Christoph Hellwig 2018-12-03 677 return true;
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 678 }
^1da177e4c3f415 arch/ia64/lib/swiotlb.c Linus Torvalds 2005-04-16 679
abe420bfae528c9 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 680 size_t swiotlb_max_mapping_size(struct device *dev)
abe420bfae528c9 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 681 {
abe420bfae528c9 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 682 return ((size_t)1 << IO_TLB_SHIFT) * IO_TLB_SEGSIZE;
abe420bfae528c9 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 683 }
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 684
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 685 bool is_swiotlb_active(void)
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 686 {
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 687 /*
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 688 * When SWIOTLB is initialized, even if io_tlb_start points to physical
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 689 * address zero, io_tlb_end surely doesn't.
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 690 */
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 691 return io_tlb_end != 0;
492366f7b423725 kernel/dma/swiotlb.c Joerg Roedel 2019-02-07 692 }
45ba8d5d061b134 kernel/dma/swiotlb.c Linus Torvalds 2019-03-10 693
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 694 #ifdef CONFIG_DEBUG_FS
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 695
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 696 static int __init swiotlb_create_debugfs(void)
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 697 {
1be51474f99bcfd kernel/dma/swiotlb.c Greg Kroah-Hartman 2019-06-12 698 struct dentry *root;
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 699
1be51474f99bcfd kernel/dma/swiotlb.c Greg Kroah-Hartman 2019-06-12 700 root = debugfs_create_dir("swiotlb", NULL);
1be51474f99bcfd kernel/dma/swiotlb.c Greg Kroah-Hartman 2019-06-12 701 debugfs_create_ulong("io_tlb_nslabs", 0400, root, &io_tlb_nslabs);
1be51474f99bcfd kernel/dma/swiotlb.c Greg Kroah-Hartman 2019-06-12 702 debugfs_create_ulong("io_tlb_used", 0400, root, &io_tlb_used);
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 703 return 0;
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 704 }
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 705
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 706 late_initcall(swiotlb_create_debugfs);
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 707
71602fe6d4e9291 kernel/dma/swiotlb.c Dongli Zhang 2019-01-18 708 #endif

:::::: The code at line 461 was first introduced by commit
:::::: d7b417fa08d1187923c270bc33a3555c2fcff8b9 x86/mm: Add DMA support for SEV memory encryption

:::::: TO: Tom Lendacky <thomas.lendacky@xxxxxxx>
:::::: CC: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
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