linux-kernel - [PATCH v3 0/2] fix dma_addressing_limited() if dma_range

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Date:   Mon, 16 Oct 2023 12:52:52 +0000
From:   Jia He <justin.he@....com>
To:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>, iommu@...ts.linux.dev
Cc:     linux-kernel@...r.kernel.org, nd@....com,
        Jia He <justin.he@....com>
Subject: [PATCH v3 0/2] fix dma_addressing_limited() if dma_range_map

This is to fix the hangs at boot. The root cause is the nvme device dma
mapping is failed in the checking path of phys_to_dma() since
dma_max_mapping_size() gave the wrong answer to start with.

---
Changelog:
v1: https://lore.kernel.org/all/20230912084002.2168-1-justin.he@arm.com/
v2: https://lore.kernel.org/lkml/20231010020835.3678-1-justin.he@arm.com/
  - refine the subject and commit msg (By Robin Murphy)
  - refactor the checking loop in check_ram_in_range_map() in the pages
    unit to avoid wrap to 0 on 32bits platforms (Robin)
v3:
  - move and export dma_addressing_limited() to avoid adding a new
    exported helper (by Christoph Hellwig)

Jia He (2):
  dma-mapping: export dma_addressing_limited()
  dma-mapping: fix dma_addressing_limited() if dma_range_map can't cover
    all system RAM

 include/linux/dma-mapping.h | 19 ++++--------
 kernel/dma/mapping.c        | 60 +++++++++++++++++++++++++++++++++++++
 2 files changed, 65 insertions(+), 14 deletions(-)

-- 
2.25.1