From: Christoph Hellwig <hch@lst.de>
To: Claire Chang <tientzu@chromium.org>
Cc: Christoph Hellwig <hch@lst.de>, Rob Herring <robh+dt@kernel.org>,
mpe@ellerman.id.au, Joerg Roedel <joro@8bytes.org>,
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Subject: Re: [PATCH v11 09/12] swiotlb: Add restricted DMA alloc/free support
Date: Wed, 16 Jun 2021 07:18:39 +0200 [thread overview]
Message-ID: <20210616051839.GA27982@lst.de> (raw)
In-Reply-To: <CALiNf2-+vL8rw5fi=DcR=V7d55Ls3-OXoxC87Pvrf1Kz14D_+A@mail.gmail.com>
On Wed, Jun 16, 2021 at 01:10:02PM +0800, Claire Chang wrote:
> On Wed, Jun 16, 2021 at 12:59 PM Christoph Hellwig <hch@lst.de> wrote:
> >
> > On Wed, Jun 16, 2021 at 12:04:16PM +0800, Claire Chang wrote:
> > > Just noticed that after propagating swiotlb_force setting into
> > > io_tlb_default_mem->force, the memory allocation behavior for
> > > swiotlb_force will change (i.e. always skipping arch_dma_alloc and
> > > dma_direct_alloc_from_pool).
> >
> > Yes, I think we need to split a "use_for_alloc" flag from the force flag.
>
> How about splitting is_dev_swiotlb_force into is_swiotlb_force_bounce
> (io_tlb_mem->force_bounce) and is_swiotlb_force_alloc
> (io_tlb_mem->force_alloc)?
Yes, something like that. I'd probably not use force for the alloc side
given that we otherwise never allocte from the swiotlb buffer.
next prev parent reply other threads:[~2021-06-16 5:18 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-16 3:52 [PATCH v11 00/12] Restricted DMA Claire Chang
2021-06-16 3:52 ` [PATCH v11 01/12] swiotlb: Refactor swiotlb init functions Claire Chang
2021-06-16 3:52 ` [PATCH v11 02/12] swiotlb: Refactor swiotlb_create_debugfs Claire Chang
2021-06-16 3:52 ` [PATCH v11 03/12] swiotlb: Set dev->dma_io_tlb_mem to the swiotlb pool used Claire Chang
2021-06-16 3:52 ` [PATCH v11 04/12] swiotlb: Update is_swiotlb_buffer to add a struct device argument Claire Chang
2021-06-16 3:52 ` [PATCH v11 05/12] swiotlb: Update is_swiotlb_active " Claire Chang
2021-06-16 3:52 ` [PATCH v11 06/12] swiotlb: Use is_dev_swiotlb_force for swiotlb data bouncing Claire Chang
2021-06-16 3:52 ` [PATCH v11 07/12] swiotlb: Move alloc_size to swiotlb_find_slots Claire Chang
2021-06-16 3:52 ` [PATCH v11 08/12] swiotlb: Refactor swiotlb_tbl_unmap_single Claire Chang
2021-06-16 3:52 ` [PATCH v11 09/12] swiotlb: Add restricted DMA alloc/free support Claire Chang
2021-06-16 4:04 ` Claire Chang
2021-06-16 4:59 ` Christoph Hellwig
2021-06-16 5:10 ` Claire Chang
2021-06-16 5:18 ` Christoph Hellwig [this message]
2021-06-16 3:52 ` [PATCH v11 10/12] swiotlb: Add restricted DMA pool initialization Claire Chang
2021-06-16 3:52 ` [PATCH v11 11/12] dt-bindings: of: Add restricted DMA pool Claire Chang
2021-06-16 3:52 ` [PATCH v11 12/12] of: Add plumbing for " Claire Chang
2021-06-16 6:25 ` [PATCH v11 00/12] Restricted DMA Claire Chang
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