linux-kernel - [Patch Part3 V1 22/22] iommu/vt-d: fix bug in computing domain's iommu

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Message-Id: <1398150453-28141-23-git-send-email-jiang.liu@linux.intel.com>
Date:	Tue, 22 Apr 2014 15:07:33 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Joerg Roedel <joro@...tes.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	Ashok Raj <ashok.raj@...el.com>,
	Yijing Wang <wangyijing@...wei.com>,
	Tony Luck <tony.luck@...el.com>,
	iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Subject: [Patch Part3 V1 22/22] iommu/vt-d: fix bug in computing domain's iommu_snooping flag

IOMMU units may dynamically attached to/detached from domains,
so we should scan all active IOMMU units when computing iommu_snooping
flag for a domain instead of only scanning IOMMU units associated
with the domain.

Also check snooping and superpage capabilities when hot-adding DMAR units.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/iommu/intel-iommu.c |   54 ++++++++++++++++++++++++++++---------------
 1 file changed, 36 insertions(+), 18 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 6d5b94aaac6e..9c39cab62cc1 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -626,50 +626,56 @@ static void domain_update_iommu_coherency(struct dmar_domain *domain)
 	rcu_read_unlock();
 }
 
-static void domain_update_iommu_snooping(struct dmar_domain *domain)
+static int domain_update_iommu_snooping(struct intel_iommu *skip)
 {
-	int i;
-
-	domain->iommu_snooping = 1;
+	struct dmar_drhd_unit *drhd;
+	struct intel_iommu *iommu;
+	int ret = 1;
 
-	for_each_set_bit(i, domain->iommu_bmp, g_num_of_iommus) {
-		if (!ecap_sc_support(g_iommus[i]->ecap)) {
-			domain->iommu_snooping = 0;
-			break;
+	rcu_read_lock();
+	for_each_active_iommu(iommu, drhd) {
+		if (iommu != skip) {
+			if (!ecap_sc_support(iommu->ecap)) {
+				ret = 0;
+				break;
+			}
 		}
 	}
+	rcu_read_unlock();
+
+	return ret;
 }
 
-static void domain_update_iommu_superpage(struct dmar_domain *domain)
+static int domain_update_iommu_superpage(struct intel_iommu *skip)
 {
 	struct dmar_drhd_unit *drhd;
-	struct intel_iommu *iommu = NULL;
+	struct intel_iommu *iommu;
 	int mask = 0xf;
 
 	if (!intel_iommu_superpage) {
-		domain->iommu_superpage = 0;
-		return;
+		return 0;
 	}
 
 	/* set iommu_superpage to the smallest common denominator */
 	rcu_read_lock();
 	for_each_active_iommu(iommu, drhd) {
-		mask &= cap_super_page_val(iommu->cap);
-		if (!mask) {
-			break;
+		if (iommu != skip) {
+			mask &= cap_super_page_val(iommu->cap);
+			if (!mask)
+				break;
 		}
 	}
 	rcu_read_unlock();
 
-	domain->iommu_superpage = fls(mask);
+	return fls(mask);
 }
 
 /* Some capabilities may be different across iommus */
 static void domain_update_iommu_cap(struct dmar_domain *domain)
 {
 	domain_update_iommu_coherency(domain);
-	domain_update_iommu_snooping(domain);
-	domain_update_iommu_superpage(domain);
+	domain->iommu_snooping = domain_update_iommu_snooping(NULL);
+	domain->iommu_superpage = domain_update_iommu_superpage(NULL);
 }
 
 static struct intel_iommu *device_to_iommu(struct device *dev, u8 *bus, u8 *devfn)
@@ -3793,6 +3799,18 @@ static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
 			iommu->name);
 		return -ENXIO;
 	}
+	if (!ecap_sc_support(iommu->ecap) &&
+	    domain_update_iommu_snooping(iommu)) {
+		pr_warn("IOMMU: %s doesn't support snooping.\n",
+			iommu->name);
+		return -ENXIO;
+	}
+	if ((cap_super_page_val(iommu->cap) &
+	    (1 << domain_update_iommu_superpage(iommu))) == 0) {
+		pr_warn("IOMMU: %s doesn't support large page.\n",
+			iommu->name);
+		return -ENXIO;
+	}
 
 	/*
 	 * Disable translation if already enabled prior to OS handover.
-- 
1.7.10.4

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