From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751743AbdJSAou (ORCPT ); Wed, 18 Oct 2017 20:44:50 -0400 Received: from mga07.intel.com ([134.134.136.100]:16470 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751700AbdJSAos (ORCPT ); Wed, 18 Oct 2017 20:44:48 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.43,398,1503385200"; d="scan'208";a="324920788" From: Lu Baolu To: joro@8bytes.org, dwmw2@infradead.org Cc: ashok.raj@intel.com, jacob.jun.pan@linux.intel.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Lu Baolu Subject: [PATCH 2/3] iommu/vt-d: Clear Page Request Overflow fault bit Date: Thu, 19 Oct 2017 08:39:15 +0800 Message-Id: <1508373556-5340-2-git-send-email-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1508373556-5340-1-git-send-email-baolu.lu@linux.intel.com> References: <1508373556-5340-1-git-send-email-baolu.lu@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently Page Request Overflow bit in IOMMU Fault Status register is not cleared. Not clearing this bit would mean that any future page-request is going to be automatically dropped by IOMMU. Suggested-by: Ashok Raj Signed-off-by: Lu Baolu --- drivers/iommu/dmar.c | 3 ++- include/linux/intel-iommu.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index 1ea7cd5..9a7ffd1 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -1679,7 +1679,8 @@ irqreturn_t dmar_fault(int irq, void *dev_id) raw_spin_lock_irqsave(&iommu->register_lock, flag); } - writel(DMA_FSTS_PFO | DMA_FSTS_PPF, iommu->reg + DMAR_FSTS_REG); + writel(DMA_FSTS_PFO | DMA_FSTS_PPF | DMA_FSTS_PRO, + iommu->reg + DMAR_FSTS_REG); unlock_exit: raw_spin_unlock_irqrestore(&iommu->register_lock, flag); diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 485a5b4..f3274d9 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -212,6 +212,7 @@ #define DMA_FSTS_IQE (1 << 4) #define DMA_FSTS_ICE (1 << 5) #define DMA_FSTS_ITE (1 << 6) +#define DMA_FSTS_PRO (1 << 7) #define dma_fsts_fault_record_index(s) (((s) >> 8) & 0xff) /* FRCD_REG, 32 bits access */ -- 2.7.4