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([129.227.183.200]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-87febb82357sm3591121b3a.61.2026.09.27.22.39.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 27 Sep 2026 22:39:13 -0700 (PDT) From: Jianfeng Liu To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Rob Clark , freedreno@lists.freedesktop.org, iommu@lists.linux.dev, Dmitry Baryshkov , =?UTF-8?q?Christian=20K=C3=B6nig?= , Sumit Semwal , linux-media@vger.kernel.org, Bryan O'Donoghue , Jianfeng Liu , Joerg Roedel , Will Deacon , Robin Murphy Subject: [PATCH v1 1/2] iommu: export iommu_get_dma_domain() Date: Mon, 28 Sep 2026 13:38:50 +0800 Message-ID: <20260928053901.7270-2-liujianfeng1994@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260928053901.7270-1-liujianfeng1994@gmail.com> References: <20260928053901.7270-1-liujianfeng1994@gmail.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit drm/msm needs to recover the physical address behind a DMA address of imported dma-bufs: with CONFIG_DMABUF_DEBUG=y the attachment sg_table it hands to importers carries no struct page, and msm has to translate sg_dma_address() back to a physical address through the attaching device's DMA-API domain to map such buffers into its own pagetables (see the follow-up drm/msm patch). Export the helper so modularized drivers can use it. Cc: Joerg Roedel Cc: Will Deacon Cc: iommu@lists.linux.dev Signed-off-by: Jianfeng Liu --- drivers/iommu/iommu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index cd1bca7ede9af..330f9a79248bd 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2327,6 +2327,7 @@ struct iommu_domain *iommu_get_dma_domain(struct device *dev) { return dev->iommu_group->default_domain; } +EXPORT_SYMBOL_GPL(iommu_get_dma_domain); static void *iommu_make_pasid_array_entry(struct iommu_domain *domain, struct iommu_attach_handle *handle) -- 2.47.3