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Message-Id: <20240529053250.91284-6-baolu.lu@linux.intel.com>
Date: Wed, 29 May 2024 13:32:35 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>,
Will Deacon <will@...nel.org>,
Robin Murphy <robin.murphy@....com>,
Jason Gunthorpe <jgg@...pe.ca>,
Kevin Tian <kevin.tian@...el.com>
Cc: Yi Liu <yi.l.liu@...el.com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Kalle Valo <kvalo@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Alex Williamson <alex.williamson@...hat.com>,
mst@...hat.com,
Jason Wang <jasowang@...hat.com>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>,
Mikko Perttunen <mperttunen@...dia.com>,
iommu@...ts.linux.dev,
dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org,
Lu Baolu <baolu.lu@...ux.intel.com>
Subject: [PATCH 05/20] iommu: Add iommu_paging_domain_alloc() interface
Commit <17de3f5fdd35> ("iommu: Retire bus ops") removes iommu ops from
bus. The iommu subsystem no longer relies on bus for operations. So the
bus parameter in iommu_domain_alloc() is no longer relevant.
Add a new interface named iommu_paging_domain_alloc(), which explicitly
indicates the allocation of a paging domain for DMA managed by a kernel
driver. The new interface takes a device pointer as its parameter, that
better aligns with the current iommu subsystem.
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
include/linux/iommu.h | 6 ++++++
drivers/iommu/iommu.c | 20 ++++++++++++++++++++
2 files changed, 26 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 6648b2415474..16401de7802d 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -781,6 +781,7 @@ extern bool device_iommu_capable(struct device *dev, enum iommu_cap cap);
extern bool iommu_group_has_isolated_msi(struct iommu_group *group);
extern struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus);
struct iommu_domain *iommu_user_domain_alloc(struct device *dev, u32 flags);
+struct iommu_domain *iommu_paging_domain_alloc(struct device *dev);
extern void iommu_domain_free(struct iommu_domain *domain);
extern int iommu_attach_device(struct iommu_domain *domain,
struct device *dev);
@@ -1092,6 +1093,11 @@ static inline struct iommu_domain *iommu_user_domain_alloc(struct device *dev, u
return ERR_PTR(-ENODEV);
}
+static inline struct iommu_domain *iommu_paging_domain_alloc(struct device *dev)
+{
+ return ERR_PTR(-ENODEV);
+}
+
static inline void iommu_domain_free(struct iommu_domain *domain)
{
}
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f1416892ef8e..7df4a021b040 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2016,6 +2016,10 @@ static int __iommu_domain_alloc_dev(struct device *dev, void *data)
return 0;
}
+/*
+ * The iommu ops in bus has been retired. Do not use this interface in
+ * new drivers.
+ */
struct iommu_domain *iommu_domain_alloc(const struct bus_type *bus)
{
const struct iommu_ops *ops = NULL;
@@ -2074,6 +2078,22 @@ struct iommu_domain *iommu_user_domain_alloc(struct device *dev, u32 flags)
}
EXPORT_SYMBOL_GPL(iommu_user_domain_alloc);
+/**
+ * iommu_paging_domain_alloc() - Allocate a paging domain
+ * @dev: device for which the domain is allocated
+ *
+ * Allocate a paging domain which will be managed by a kernel driver. Return
+ * allocated domain if successful, or a ERR pointer for failure.
+ */
+struct iommu_domain *iommu_paging_domain_alloc(struct device *dev)
+{
+ if (!dev_has_iommu(dev))
+ return ERR_PTR(-ENODEV);
+
+ return __iommu_domain_alloc(dev_iommu_ops(dev), dev, IOMMU_DOMAIN_UNMANAGED);
+}
+EXPORT_SYMBOL_GPL(iommu_paging_domain_alloc);
+
void iommu_domain_free(struct iommu_domain *domain)
{
if (domain->type == IOMMU_DOMAIN_SVA)
--
2.34.1
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