From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lu Baolu Subject: [PATCH 05/10] iommu/vt-d: Setup pasid entry for RID2PASID support Date: Mon, 16 Jul 2018 14:49:48 +0800 Message-ID: <1531723793-14607-6-git-send-email-baolu.lu@linux.intel.com> References: <1531723793-14607-1-git-send-email-baolu.lu@linux.intel.com> Return-path: In-Reply-To: <1531723793-14607-1-git-send-email-baolu.lu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org To: Joerg Roedel , David Woodhouse Cc: ashok.raj@intel.com, sanjay.k.kumar@intel.com, jacob.jun.pan@intel.com, kevin.tian@intel.com, yi.l.liu@intel.com, yi.y.sun@intel.com, peterx@redhat.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu , Jacob Pan List-Id: iommu@lists.linux-foundation.org when the scalable mode is enabled, there is no second level page translation pointer in the context entry any more (for DMA request without PASID). Instead, a new RID2PASID field is introduced in the context entry. Software can choose any PASID value to set RID2PASID and then setup the translation in the corresponding PASID entry. Upon receiving a DMA request without PASID, hardware will firstly look at this RID2PASID field and then treat this request as a request with a pasid value specified in RID2PASID field. Though software is allowed to use any PASID for the RID2PASID, we will always use the PASID 0 as a sort of design decision. Cc: Ashok Raj Cc: Jacob Pan Cc: Kevin Tian Cc: Liu Yi L Signed-off-by: Sanjay Kumar Signed-off-by: Lu Baolu Reviewed-by: Ashok Raj --- drivers/iommu/intel-iommu.c | 10 ++++++++++ drivers/iommu/intel-pasid.h | 1 + 2 files changed, 11 insertions(+) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index a139a45..62e9579 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2421,12 +2421,22 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu, dev->archdata.iommu = info; if (dev && dev_is_pci(dev) && sm_supported(iommu)) { + bool pass_through; + ret = intel_pasid_alloc_table(dev); if (ret) { __dmar_remove_one_dev_info(info); spin_unlock_irqrestore(&device_domain_lock, flags); return NULL; } + + /* Setup the PASID entry for requests without PASID: */ + pass_through = hw_pass_through && domain_type_is_si(domain); + spin_lock(&iommu->lock); + intel_pasid_setup_second_level(iommu, domain, dev, + PASID_RID2PASID, + pass_through); + spin_unlock(&iommu->lock); } spin_unlock_irqrestore(&device_domain_lock, flags); diff --git a/drivers/iommu/intel-pasid.h b/drivers/iommu/intel-pasid.h index 2fe40ff..80fc88e 100644 --- a/drivers/iommu/intel-pasid.h +++ b/drivers/iommu/intel-pasid.h @@ -10,6 +10,7 @@ #ifndef __INTEL_PASID_H #define __INTEL_PASID_H +#define PASID_RID2PASID 0x0 #define PASID_MIN 0x1 #define PASID_MAX 0x100000 #define PASID_PTE_MASK 0x3F -- 2.7.4