Message ID | 20210527125845.1852284-4-tientzu@chromium.org (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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Thu, 27 May 2021 05:59:21 -0700 (PDT) From: Claire Chang <tientzu@chromium.org> To: 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> Subject: [PATCH v8 03/15] swiotlb: Add DMA_RESTRICTED_POOL Date: Thu, 27 May 2021 20:58:33 +0800 Message-Id: <20210527125845.1852284-4-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.818.g46aad6cb9e-goog In-Reply-To: <20210527125845.1852284-1-tientzu@chromium.org> References: <20210527125845.1852284-1-tientzu@chromium.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development <dri-devel.lists.freedesktop.org> List-Unsubscribe: <https://lists.freedesktop.org/mailman/options/dri-devel>, <mailto:dri-devel-request@lists.freedesktop.org?subject=unsubscribe> List-Archive: <https://lists.freedesktop.org/archives/dri-devel> List-Post: <mailto:dri-devel@lists.freedesktop.org> List-Help: <mailto:dri-devel-request@lists.freedesktop.org?subject=help> List-Subscribe: <https://lists.freedesktop.org/mailman/listinfo/dri-devel>, <mailto:dri-devel-request@lists.freedesktop.org?subject=subscribe> Cc: heikki.krogerus@linux.intel.com, thomas.hellstrom@linux.intel.com, peterz@infradead.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, grant.likely@arm.com, paulus@samba.org, mingo@kernel.org, jxgao@google.com, sstabellini@kernel.org, Saravana Kannan <saravanak@google.com>, xypron.glpk@gmx.de, "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>, Bartosz Golaszewski <bgolaszewski@baylibre.com>, bskeggs@redhat.com, linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, Thierry Reding <treding@nvidia.com>, intel-gfx@lists.freedesktop.org, matthew.auld@intel.com, linux-devicetree <devicetree@vger.kernel.org>, airlied@linux.ie, Robin Murphy <robin.murphy@arm.com>, Nicolas Boichat <drinkcat@chromium.org>, rodrigo.vivi@intel.com, bhelgaas@google.com, tientzu@chromium.org, Dan Williams <dan.j.williams@intel.com>, Andy Shevchenko <andriy.shevchenko@linux.intel.com>, Greg KH <gregkh@linuxfoundation.org>, Randy Dunlap <rdunlap@infradead.org>, lkml <linux-kernel@vger.kernel.org>, tfiga@chromium.org, "list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>, Jim Quinlan <james.quinlan@broadcom.com>, linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" <dri-devel-bounces@lists.freedesktop.org> |
Series |
Restricted DMA
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expand
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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 + help + This enables support for restricted DMA pools which provide a level of + DMA memory protection on systems with limited hardware protection + capabilities, such as those lacking an IOMMU. + + For more information see + <Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt> + and <kernel/dma/swiotlb.c>. + If unsure, say "n". + # # Should be selected if we can mmap non-coherent mappings to userspace. # The only thing that is really required is a way to set an uncached bit
Add a new kconfig symbol, DMA_RESTRICTED_POOL, for restricted DMA pool. Signed-off-by: Claire Chang <tientzu@chromium.org> --- kernel/dma/Kconfig | 14 ++++++++++++++ 1 file changed, 14 insertions(+)