[PATCH v2] wifi: ath11k: fix IOMMU errors on buffer rings
Kalle Valo
kvalo at kernel.org
Tue Jan 9 07:41:46 PST 2024
Zhenghao Gu <imguzh at gmail.com> writes:
> virt_to_phys doesn't work on systems with IOMMU enabled,
> which have non-identity physical-to-IOVA mappings.
Can you give an example of such system? Just curious where you are
seeing this.
> It leads to IO_PAGE_FAULTs like this:
> [IO_PAGE_FAULT domain=0x0023 address=0x1cce00000 flags=0x0020]
> and no link can be established.
What do you mean with link in this context? Are you talking about 802.11
association?
> This patch changes that to dma_map_single(), which works correctly.
Good catch. And virt_to_phys() documentation even says this:
* This function does not give bus mappings for DMA transfers. In
* almost all conceivable cases a device driver should not be using
* this function
> Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.7.0.1-01744-QCAHKSWPL_SILICONZ-1
> Signed-off-by: Zhenghao Gu <imguzh at gmail.com>
Jeff, are you ok with this?
I did some cosmetics changes in the pending branch (removed unnecessary
parenthesis, reverse xmas tree etc), please check:
https://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git/commit/?h=pending&id=fefa43d63e1928fce6e8c2bb626900e9ce98ca69
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