From mboxrd@z Thu Jan 1 00:00:00 1970 From: Quan Xu Subject: [PATCH v4 2/3] VT-d: Reduce spin timeout to 1ms, which can be boot-time changed. Date: Wed, 23 Dec 2015 16:25:35 +0800 Message-ID: <1450859136-98482-3-git-send-email-quan.xu@intel.com> References: <1450859136-98482-1-git-send-email-quan.xu@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1450859136-98482-1-git-send-email-quan.xu@intel.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: jbeulich@suse.com, kevin.tian@intel.com Cc: feng.wu@intel.com, eddie.dong@intel.com, george.dunlap@eu.citrix.com, andrew.cooper3@citrix.com, tim@xen.org, xen-devel@lists.xen.org, jun.nakajima@intel.com, Quan Xu , keir@xen.org List-Id: xen-devel@lists.xenproject.org Signed-off-by: Quan Xu --- xen/drivers/passthrough/vtd/qinval.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/xen/drivers/passthrough/vtd/qinval.c b/xen/drivers/passthrough/vtd/qinval.c index 946e812..b227e4e 100644 --- a/xen/drivers/passthrough/vtd/qinval.c +++ b/xen/drivers/passthrough/vtd/qinval.c @@ -28,6 +28,11 @@ #include "vtd.h" #include "extern.h" +static int __read_mostly iommu_qi_timeout_ms = 1; +integer_param("iommu_qi_timeout_ms", iommu_qi_timeout_ms); + +#define IOMMU_QI_TIMEOUT (iommu_qi_timeout_ms * MILLISECS(1)) + static void print_qi_regs(struct iommu *iommu) { u64 val; @@ -167,10 +172,12 @@ static int queue_invalidate_wait(struct iommu *iommu, start_time = NOW(); while ( poll_slot != QINVAL_STAT_DONE ) { - if ( NOW() > (start_time + DMAR_OPERATION_TIMEOUT) ) + if ( NOW() > (start_time + IOMMU_QI_TIMEOUT) ) { print_qi_regs(iommu); - panic("queue invalidate wait descriptor was not executed"); + dprintk(XENLOG_WARNING VTDPREFIX, + "Queue invalidate wait descriptor was timeout.\n"); + return -ETIMEDOUT; } cpu_relax(); } -- 1.9.1