linux-kernel - [PATCH v3 11/16] iommu/vt-d: use threaded irq for dmar

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Message-Id: <1510944914-54430-12-git-send-email-jacob.jun.pan@linux.intel.com>
Date:   Fri, 17 Nov 2017 10:55:09 -0800
From:   Jacob Pan <jacob.jun.pan@...ux.intel.com>
To:     iommu@...ts.linux-foundation.org,
        LKML <linux-kernel@...r.kernel.org>,
        Joerg Roedel <joro@...tes.org>,
        David Woodhouse <dwmw2@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Alex Williamson <alex.williamson@...hat.com>
Cc:     "Liu, Yi L" <yi.l.liu@...el.com>,
        Lan Tianyu <tianyu.lan@...el.com>,
        "Tian, Kevin" <kevin.tian@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Jean Delvare <khali@...ux-fr.org>,
        "Christoph Hellwig" <hch@...radead.org>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v3 11/16] iommu/vt-d: use threaded irq for dmar_fault

Currently, dmar fault IRQ handler does nothing more than rate
limited printk, no critical hardware handling need to be done
in IRQ context.
Convert it to threaded IRQ would allow fault processing that
requires process context. e.g. find out offending device based
on source ID in the fault rasons.

Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
---
 drivers/iommu/dmar.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index f69f6ee..38ee91b 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -1749,7 +1749,8 @@ int dmar_set_interrupt(struct intel_iommu *iommu)
 		return -EINVAL;
 	}
 
-	ret = request_irq(irq, dmar_fault, IRQF_NO_THREAD, iommu->name, iommu);
+	ret = request_threaded_irq(irq, NULL, dmar_fault,
+				IRQF_ONESHOT, iommu->name, iommu);
 	if (ret)
 		pr_err("Can't request irq\n");
 	return ret;
-- 
2.7.4