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Tue, 24 Aug 2021 07:26:02 -0700 (PDT) Date: Tue, 24 Aug 2021 07:26:01 -0700 From: Guenter Roeck To: Claire Chang Subject: Re: [PATCH v15 10/12] swiotlb: Add restricted DMA pool initialization Message-ID: <20210824142601.GA3393158@roeck-us.net> References: <20210624155526.2775863-1-tientzu@chromium.org> <20210624155526.2775863-11-tientzu@chromium.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210624155526.2775863-11-tientzu@chromium.org> Cc: heikki.krogerus@linux.intel.com, thomas.hellstrom@linux.intel.com, peterz@infradead.org, benh@kernel.crashing.org, joonas.lahtinen@linux.intel.com, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, grant.likely@arm.com, paulus@samba.org, Frank Rowand , mingo@kernel.org, sstabellini@kernel.org, Saravana Kannan , mpe@ellerman.id.au, "Rafael J . Wysocki" , Christoph Hellwig , Bartosz Golaszewski , bskeggs@redhat.com, linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, Thierry Reding , intel-gfx@lists.freedesktop.org, matthew.auld@intel.com, linux-devicetree , jxgao@google.com, daniel@ffwll.ch, Will Deacon , Konrad Rzeszutek Wilk , maarten.lankhorst@linux.intel.com, airlied@linux.ie, Dan Williams , linuxppc-dev@lists.ozlabs.org, jani.nikula@linux.intel.com, Rob Herring , rodrigo.vivi@intel.com, bhelgaas@google.com, boris.ostrovsky@oracle.com, Andy Shevchenko , jgross@suse.com, Nicolas Boichat , Greg KH , Randy Dunlap , quic_qiancai@quicinc.com, lkml , "list@263.net:IOMMU DRIVERS" , Jim Quinlan , xypron.glpk@gmx.de, thomas.lendacky@amd.com, Robin Murphy , bauerman@linux.ibm.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" 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 > Reviewed-by: Christoph Hellwig > Tested-by: Stefano Stabellini > Tested-by: Will Deacon > --- > 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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu