From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joerg Roedel Subject: [PATCH 03/19] iommu/vt-d: Make root entry visible for hardware right after allocation Date: Sat, 13 Jun 2015 08:47:11 +0200 Message-ID: <1434178047-17809-4-git-send-email-joro@8bytes.org> References: <1434178047-17809-1-git-send-email-joro@8bytes.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1434178047-17809-1-git-send-email-joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: iommu-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Cc: Joerg Roedel , David Woodhouse , jroedel-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, zhen-hual-VXdhtT5mjnY@public.gmane.org, dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org List-Id: iommu@lists.linux-foundation.org From: Joerg Roedel In case there was an old root entry, make our new one visible immediately after it was allocated. Signed-off-by: Joerg Roedel --- drivers/iommu/intel-iommu.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index b380fd1..f82918e 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -2797,6 +2797,12 @@ static int __init init_dmars(void) ret = iommu_alloc_root_entry(iommu); if (ret) goto free_iommu; + + iommu_flush_write_buffer(iommu); + iommu_set_root_entry(iommu); + iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL); + iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH); + if (!ecap_pass_through(iommu->ecap)) hw_pass_through = 0; } @@ -2873,10 +2879,6 @@ static int __init init_dmars(void) if (ret) goto free_iommu; - iommu_set_root_entry(iommu); - - iommu->flush.flush_context(iommu, 0, 0, 0, DMA_CCMD_GLOBAL_INVL); - iommu->flush.flush_iotlb(iommu, 0, 0, 0, DMA_TLB_GLOBAL_FLUSH); iommu_enable_translation(iommu); iommu_disable_protect_mem_regions(iommu); } -- 1.9.1