From: will.deacon@arm•com (Will Deacon)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 5/5] iommu: Allow default domain type to be set on the kernel command line
Date: Tue, 21 Mar 2017 17:21:37 +0000 [thread overview]
Message-ID: <20170321172137.GF30948@arm.com> (raw)
In-Reply-To: <20170321154527.GB29659@8bytes.org>
On Tue, Mar 21, 2017 at 04:45:27PM +0100, Joerg Roedel wrote:
> On Fri, Mar 10, 2017 at 08:49:36PM +0000, Will Deacon wrote:
> > @@ -1014,8 +1027,8 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
> > * IOMMU driver.
> > */
> > if (!group->default_domain) {
> > - group->default_domain = __iommu_domain_alloc(dev->bus,
> > - IOMMU_DOMAIN_DMA);
> > + group->default_domain =
> > + __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
>
> It would be good to have a fall-back here if we are talking to an IOMMU
> driver that uses default domains, but does not support identity-mapped
> domains (yet). Exynos and Rockchip IOMMU drivers seem to fall into this
> category. A dev_warn() also makes sense in case allocating a identity
> domain fails.
Sure, something like the diff below?
Will
--->8
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 42a842e3f95f..f787626a745d 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1027,10 +1027,19 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev)
* IOMMU driver.
*/
if (!group->default_domain) {
- group->default_domain =
- __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
+ struct iommu_domain *dom;
+
+ dom = __iommu_domain_alloc(dev->bus, iommu_def_domain_type);
+ if (!dom) {
+ dev_warn(dev,
+ "failed to allocate default IOMMU domain of type %u; falling back to IOMMU_DOMAIN_DMA",
+ iommu_def_domain_type);
+ dom = __iommu_domain_alloc(dev->bus, IOMMU_DOMAIN_DMA);
+ }
+
+ group->default_domain = dom;
if (!group->domain)
- group->domain = group->default_domain;
+ group->domain = dom;
}
ret = iommu_group_add_device(group, dev);
next prev parent reply other threads:[~2017-03-21 17:21 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-10 20:49 [PATCH v2 0/5] Implement SMMU passthrough using the default domain Will Deacon
2017-03-10 20:49 ` [PATCH v2 1/5] iommu/arm-smmu: Restrict domain attributes to UNMANAGED domains Will Deacon
2017-03-10 20:49 ` [PATCH v2 2/5] iommu/arm-smmu: Install bypass S2CRs for IOMMU_DOMAIN_IDENTITY domains Will Deacon
2017-03-10 20:49 ` [PATCH v2 3/5] iommu/arm-smmu-v3: Make arm_smmu_install_ste_for_dev return void Will Deacon
2017-03-16 16:55 ` Nate Watterson
2017-03-10 20:49 ` [PATCH v2 4/5] iommu/arm-smmu-v3: Install bypass STEs for IOMMU_DOMAIN_IDENTITY domains Will Deacon
2017-03-16 16:24 ` Nate Watterson
2017-03-16 18:19 ` Robin Murphy
2017-03-21 17:08 ` Will Deacon
2017-03-21 17:33 ` Robin Murphy
2017-03-10 20:49 ` [PATCH v2 5/5] iommu: Allow default domain type to be set on the kernel command line Will Deacon
2017-03-21 15:45 ` Joerg Roedel
2017-03-21 17:21 ` Will Deacon [this message]
2017-03-21 17:46 ` Robin Murphy
2017-03-21 18:17 ` Will Deacon
2017-03-23 10:22 ` Sricharan R
2017-03-23 10:38 ` Sricharan R
2017-03-22 11:25 ` Joerg Roedel
2017-03-21 15:46 ` [PATCH v2 0/5] Implement SMMU passthrough using the default domain Joerg Roedel
2017-03-21 16:42 ` Will Deacon
2017-03-21 16:46 ` Joerg Roedel
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