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Thu, 30 Apr 2020 07:40:15 -0700 (PDT) From: Jean-Philippe Brucker To: iommu@lists.linux-foundation.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v6 01/25] mm: Add a PASID field to mm_struct Date: Thu, 30 Apr 2020 16:34:00 +0200 Message-Id: <20200430143424.2787566-2-jean-philippe@linaro.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200430143424.2787566-1-jean-philippe@linaro.org> References: <20200430143424.2787566-1-jean-philippe@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200430_074017_990082_CD53BCCA X-CRM114-Status: GOOD ( 10.20 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2a00:1450:4864:20:0:0:0:344 listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fenghua.yu@intel.com, kevin.tian@intel.com, jacob.jun.pan@linux.intel.com, jgg@ziepe.ca, catalin.marinas@arm.com, joro@8bytes.org, robin.murphy@arm.com, hch@infradead.org, zhangfei.gao@linaro.org, Jean-Philippe Brucker , Jonathan.Cameron@huawei.com, felix.kuehling@amd.com, xuzaibo@huawei.com, will@kernel.org, christian.koenig@amd.com, baolu.lu@linux.intel.com Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Some devices can tag their DMA requests with a 20-bit Process Address Space ID (PASID), allowing them to access multiple address spaces. In combination with recoverable I/O page faults (for example PCIe PRI), PASID allows the IOMMU to share page tables with the MMU. To make sure that a single PASID is allocated for each address space, as required by Intel ENQCMD, store the PASID in the mm_struct. The IOMMU driver is in charge of serializing modifications to the PASID field. Signed-off-by: Jean-Philippe Brucker --- For the field's validity I'm thinking invalid PASID = 0. In ioasid.h we define INVALID_IOASID as ~0U, but I think we can now change it to 0, since Intel is now also reserving PASID #0 for Transactions without PASID and AMD IOMMU uses GIoV for this too. --- include/linux/mm_types.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 4aba6c0c2ba80..8db6472758175 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -534,6 +534,10 @@ struct mm_struct { atomic_long_t hugetlb_usage; #endif struct work_struct async_put_work; +#ifdef CONFIG_IOMMU_SUPPORT + /* Address space ID used by device DMA */ + unsigned int pasid; +#endif } __randomize_layout; /*