From: Guenter Roeck <linux@roeck-us.net>
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>,
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Subject: Re: [PATCH v15 10/12] swiotlb: Add restricted DMA pool initialization
Date: Tue, 24 Aug 2021 07:26:01 -0700 [thread overview]
Message-ID: <20210824142601.GA3393158@roeck-us.net> (raw)
In-Reply-To: <20210624155526.2775863-11-tientzu@chromium.org>
Hi Claire,
On Thu, Jun 24, 2021 at 11:55:24PM +0800, Claire Chang wrote:
> Add the initialization function to create restricted DMA pools from
> matching reserved-memory nodes.
>
> Regardless of swiotlb setting, the restricted DMA pool is preferred if
> available.
>
> The restricted DMA pools provide a basic level of protection against the
> DMA overwriting buffer contents at unexpected times. However, to protect
> against general data leakage and system memory corruption, the system
> needs to provide a way to lock down the memory access, e.g., MPU.
>
> Signed-off-by: Claire Chang <tientzu@chromium.org>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Tested-by: Stefano Stabellini <sstabellini@kernel.org>
> Tested-by: Will Deacon <will@kernel.org>
> ---
> include/linux/swiotlb.h | 3 +-
> kernel/dma/Kconfig | 14 ++++++++
> kernel/dma/swiotlb.c | 76 +++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 92 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h
> index 3b9454d1e498..39284ff2a6cd 100644
> --- a/include/linux/swiotlb.h
> +++ b/include/linux/swiotlb.h
> @@ -73,7 +73,8 @@ extern enum swiotlb_force swiotlb_force;
> * range check to see if the memory was in fact allocated by this
> * API.
> * @nslabs: The number of IO TLB blocks (in groups of 64) between @start and
> - * @end. This is command line adjustable via setup_io_tlb_npages.
> + * @end. For default swiotlb, this is command line adjustable via
> + * setup_io_tlb_npages.
> * @used: The number of used IO TLB block.
> * @list: The free list describing the number of free entries available
> * from each index.
> diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
> index 77b405508743..3e961dc39634 100644
> --- a/kernel/dma/Kconfig
> +++ b/kernel/dma/Kconfig
> @@ -80,6 +80,20 @@ config SWIOTLB
> bool
> select NEED_DMA_MAP_STATE
>
> +config DMA_RESTRICTED_POOL
> + bool "DMA Restricted Pool"
> + depends on OF && OF_RESERVED_MEM
> + select SWIOTLB
This makes SWIOTLB user configurable, which in turn results in
mips64-linux-ld: arch/mips/kernel/setup.o: in function `arch_mem_init':
setup.c:(.init.text+0x19c8): undefined reference to `plat_swiotlb_setup'
make[1]: *** [Makefile:1280: vmlinux] Error 1
when building mips:allmodconfig.
Should this possibly be "depends on SWIOTLB" ?
Thanks,
Guenter
next prev parent reply other threads:[~2021-08-24 14:26 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-24 15:55 [PATCH v15 00/12] Restricted DMA Claire Chang
2021-06-24 15:55 ` [PATCH v15 01/12] swiotlb: Refactor swiotlb init functions Claire Chang
2021-06-24 15:55 ` [PATCH v15 02/12] swiotlb: Refactor swiotlb_create_debugfs Claire Chang
2021-06-24 15:55 ` [PATCH v15 03/12] swiotlb: Set dev->dma_io_tlb_mem to the swiotlb pool used Claire Chang
2021-06-24 15:55 ` [PATCH v15 04/12] swiotlb: Update is_swiotlb_buffer to add a struct device argument Claire Chang
2021-06-24 15:55 ` [PATCH v15 05/12] swiotlb: Update is_swiotlb_active " Claire Chang
2021-06-24 15:55 ` [PATCH v15 06/12] swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing Claire Chang
[not found] ` <YNvMDFWKXSm4LRfZ@Ryzen-9-3900X.localdomain>
2021-06-30 9:17 ` Claire Chang
2021-06-30 11:43 ` Will Deacon
2021-06-30 15:56 ` Nathan Chancellor
2021-07-01 7:40 ` Will Deacon
[not found] ` <ea28db1f-846e-4f0a-4f13-beb67e66bbca@kernel.org>
2021-07-02 13:58 ` Will Deacon
2021-07-02 15:13 ` Robin Murphy
[not found] ` <YN/7xcxt/XGAKceZ@Ryzen-9-3900X.localdomain>
2021-07-05 7:29 ` Claire Chang
2021-07-05 19:03 ` Will Deacon
2021-07-06 4:48 ` Christoph Hellwig
2021-07-06 13:24 ` Will Deacon
2021-07-06 14:01 ` Robin Murphy
2021-07-06 14:05 ` Christoph Hellwig
2021-07-06 14:46 ` Konrad Rzeszutek Wilk
2021-07-06 16:57 ` Will Deacon
2021-07-06 16:59 ` Konrad Rzeszutek Wilk
2021-07-12 13:56 ` Will Deacon
2021-07-14 0:06 ` Konrad Rzeszutek Wilk
2021-07-06 15:39 ` Robin Murphy
2021-07-06 17:06 ` Will Deacon
2021-07-06 19:14 ` Nathan Chancellor
2021-07-08 16:44 ` Will Deacon
2021-06-24 15:55 ` [PATCH v15 07/12] swiotlb: Move alloc_size to swiotlb_find_slots Claire Chang
2021-06-24 15:55 ` [PATCH v15 08/12] swiotlb: Refactor swiotlb_tbl_unmap_single Claire Chang
2021-06-24 15:55 ` [PATCH v15 09/12] swiotlb: Add restricted DMA alloc/free support Claire Chang
2021-06-24 15:55 ` [PATCH v15 10/12] swiotlb: Add restricted DMA pool initialization Claire Chang
2021-08-24 14:26 ` Guenter Roeck [this message]
2021-08-27 3:50 ` Claire Chang
2021-08-27 6:58 ` Andy Shevchenko
2021-06-24 15:55 ` [PATCH v15 11/12] dt-bindings: of: Add restricted DMA pool Claire Chang
2021-06-24 15:55 ` [PATCH v15 12/12] of: Add plumbing for " Claire Chang
2021-07-02 3:08 ` Guenter Roeck
2021-07-02 11:39 ` Robin Murphy
2021-07-02 13:18 ` Will Deacon
2021-07-02 13:48 ` Guenter Roeck
2021-06-24 19:19 ` [PATCH v15 00/12] Restricted DMA Konrad Rzeszutek Wilk
2021-06-25 0:41 ` Claire Chang
2021-06-25 12:30 ` Will Deacon
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