Messages in this thread | ![/](/images/icornerl.gif) | | From | Petr Tesarik <> | Subject | [PATCH v2 0/2] swiotlb: allocate padding slots if necessary | Date | Mon, 18 Mar 2024 14:04:45 +0100 |
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From: Petr Tesarik <petr.tesarik1@huawei-partners.com>
If the allocation alignment is bigger than IO_TLB_SIZE and min_align_mask covers some bits in the original address between IO_TLB_SIZE and alloc_align_mask, preserve these bits by allocating additional padding slots before the actual swiotlb buffer.
Changes from v1 --------------- * Rename padding to pad_slots. * Set pad_slots only for the first allocated non-padding slot. * Do not bother initializing orig_addr to INVALID_PHYS_ADDR. * Change list and pad_slots to unsigned short to avoid growing struct io_tlb_slot on 32-bit targets. * Add build-time check that list and pad_slots can hold the maximum allowed value of IO_TLB_SEGSIZE.
Petr Tesarik (2): swiotlb: extend buffer pre-padding to alloc_align_mask if necessary bug: introduce ASSERT_VAR_CAN_HOLD()
include/linux/build_bug.h | 10 ++++++++++ kernel/dma/swiotlb.c | 37 +++++++++++++++++++++++++++++++------ 2 files changed, 41 insertions(+), 6 deletions(-)
-- 2.34.1
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