From: Christoph Hellwig <hch@lst.de>
To: Claire Chang <tientzu@chromium.org>
Cc: Rob Herring <robh+dt@kernel.org>,
mpe@ellerman.id.au, Joerg Roedel <joro@8bytes.org>,
Will Deacon <will@kernel.org>,
Frank Rowand <frowand.list@gmail.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
boris.ostrovsky@oracle.com, jgross@suse.com,
Christoph Hellwig <hch@lst.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
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Subject: Re: [PATCH v10 10/12] swiotlb: Add restricted DMA alloc/free support
Date: Tue, 15 Jun 2021 15:42:08 +0200 [thread overview]
Message-ID: <20210615134208.GJ20389@lst.de> (raw)
In-Reply-To: <20210615132711.553451-11-tientzu@chromium.org>
On Tue, Jun 15, 2021 at 09:27:09PM +0800, Claire Chang wrote:
> Add the functions, swiotlb_{alloc,free} to support the memory allocation
> from restricted DMA pool.
>
> The restricted DMA pool is preferred if available.
>
> Note that since coherent allocation needs remapping, one must set up
> another device coherent pool by shared-dma-pool and use
> dma_alloc_from_dev_coherent instead for atomic coherent allocation.
Note: when applied this should go before the next patch to make sure
bisection works fine.
> #ifdef CONFIG_DMA_RESTRICTED_POOL
> +struct page *swiotlb_alloc(struct device *dev, size_t size)
> +{
> + struct io_tlb_mem *mem = dev->dma_io_tlb_mem;
> + phys_addr_t tlb_addr;
> + int index;
> +
> + /*
> + * Skip io_tlb_default_mem since swiotlb_alloc doesn't support atomic
> + * coherent allocation. Otherwise might break existing devices.
> + * One must set up another device coherent pool by shared-dma-pool and
> + * use dma_alloc_from_dev_coherent instead for atomic coherent
> + * allocation to avoid mempry remapping.
s/mempry/memory/g
Otherwise looks good:
Reviewed-by: Christoph Hellwig <hch@lst.de>
next prev parent reply other threads:[~2021-06-15 13:42 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-15 13:26 [PATCH v10 00/12] Restricted DMA Claire Chang
2021-06-15 13:27 ` [PATCH v10 01/12] swiotlb: Refactor swiotlb init functions Claire Chang
2021-06-15 13:37 ` Christoph Hellwig
2021-06-15 13:27 ` [PATCH v10 02/12] swiotlb: Refactor swiotlb_create_debugfs Claire Chang
2021-06-15 13:38 ` Christoph Hellwig
2021-06-15 13:27 ` [PATCH v10 03/12] swiotlb: Set dev->dma_io_tlb_mem to the swiotlb pool used Claire Chang
2021-06-15 13:38 ` Christoph Hellwig
2021-06-15 22:21 ` Konrad Rzeszutek Wilk
2021-06-15 13:27 ` [PATCH v10 04/12] swiotlb: Update is_swiotlb_buffer to add a struct device argument Claire Chang
2021-06-15 13:38 ` Christoph Hellwig
2021-06-15 13:27 ` [PATCH v10 05/12] swiotlb: Update is_swiotlb_active " Claire Chang
2021-06-15 13:39 ` Christoph Hellwig
2021-06-15 13:27 ` [PATCH v10 06/12] swiotlb: Use is_dev_swiotlb_force for swiotlb data bouncing Claire Chang
2021-06-15 13:39 ` Christoph Hellwig
2021-06-15 13:27 ` [PATCH v10 07/12] swiotlb: Move alloc_size to swiotlb_find_slots Claire Chang
2021-06-15 13:39 ` Christoph Hellwig
2021-06-15 13:27 ` [PATCH v10 08/12] swiotlb: Refactor swiotlb_tbl_unmap_single Claire Chang
2021-06-15 13:40 ` Christoph Hellwig
2021-06-15 13:27 ` [PATCH v10 09/12] swiotlb: Add restricted DMA pool initialization Claire Chang
2021-06-15 13:40 ` Christoph Hellwig
2021-06-15 13:27 ` [PATCH v10 10/12] swiotlb: Add restricted DMA alloc/free support Claire Chang
2021-06-15 13:42 ` Christoph Hellwig [this message]
2021-06-15 13:27 ` [PATCH v10 11/12] dt-bindings: of: Add restricted DMA pool Claire Chang
2021-06-15 13:27 ` [PATCH v10 12/12] of: Add plumbing for " Claire Chang
2021-06-16 3:55 ` [PATCH v10 00/12] Restricted DMA Claire Chang
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