From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lu Baolu Subject: [PATCH v2 02/10] iommu/vt-d: Add helpers for domain mapping/unmapping Date: Wed, 27 Mar 2019 14:34:58 +0800 Message-ID: <20190327063506.32564-3-baolu.lu@linux.intel.com> References: <20190327063506.32564-1-baolu.lu@linux.intel.com> Return-path: In-Reply-To: <20190327063506.32564-1-baolu.lu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: David Woodhouse , Joerg Roedel , ashok.raj@intel.com, jacob.jun.pan@intel.com, alan.cox@intel.com, kevin.tian@intel.com, mika.westerberg@linux.intel.com, pengfei.xu@intel.com Cc: iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu , Jacob Pan List-Id: iommu@lists.linux-foundation.org This adds two helpers to map or unmap a physically contiguous memory region in the page table of an iommu domain. Cc: Ashok Raj Cc: Jacob Pan Signed-off-by: Lu Baolu Tested-by: Xu Pengfei Tested-by: Mika Westerberg --- drivers/iommu/intel-iommu.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/intel-iommu.h | 5 +++++ 2 files changed, 40 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index c137f0f2cf49..19b1ff02025a 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -5851,3 +5851,38 @@ static void __init check_tylersburg_isoch(void) pr_warn("Recommended TLB entries for ISOCH unit is 16; your BIOS set %d\n", vtisochctrl); } + +/* + * Map a physically contiguous memory region in the dma page table + * of an iommu domain. + */ +int +domain_iomap_range(struct dmar_domain *domain, unsigned long addr, + phys_addr_t paddr, size_t size, int prot) +{ + return domain_mapping(domain, + mm_to_dma_pfn(IOVA_PFN(addr)), + NULL, + mm_to_dma_pfn(IOVA_PFN(paddr)), + aligned_nrpages(addr, size), + prot); +} + +/* + * Unmap a physically contiguous memory region in the dma page table + * of an iommu domain. Return the free page list that should be freed + * after iotlb flush. We can't free these pages here since it possibly + * is still used by iotlb cache for a DMA translation. + */ +struct page * +domain_iounmap_range(struct dmar_domain *domain, unsigned long addr, + size_t size) +{ + unsigned long nrpages, start_pfn, last_pfn; + + nrpages = aligned_nrpages(addr, size); + start_pfn = mm_to_dma_pfn(IOVA_PFN(addr)); + last_pfn = start_pfn + nrpages - 1; + + return domain_unmap(domain, start_pfn, last_pfn); +} diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 6925a18a5ca3..74afedfe193b 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -663,6 +663,11 @@ int for_each_device_domain(int (*fn)(struct device_domain_info *info, void iommu_flush_write_buffer(struct intel_iommu *iommu); int intel_iommu_enable_pasid(struct intel_iommu *iommu, struct device *dev); +int domain_iomap_range(struct dmar_domain *domain, unsigned long addr, + phys_addr_t paddr, size_t size, int prot); +struct page *domain_iounmap_range(struct dmar_domain *domain, + unsigned long addr, size_t size); + #ifdef CONFIG_INTEL_IOMMU_SVM int intel_svm_init(struct intel_iommu *iommu); extern int intel_svm_enable_prq(struct intel_iommu *iommu); -- 2.17.1