[PATCH 2/2] iommu: Rename ops->domain_alloc_user() to domain_alloc_paging_flags()
Jason Gunthorpe
jgg at nvidia.com
Thu Nov 14 11:55:31 PST 2024
Now that the main domain allocating path is calling this function it
doesn't make sense to leave it named _user. Change the name to
alloc_paging_flags() to mirror the new iommu_paging_domain_alloc_flags()
function.
A driver should implement only one of ops->domain_alloc_paging() or
ops->domain_alloc_paging_user(). The former is a simpler interface with
less boiler plate that the majority of drivers use. The latter is for
drivers with a greater feature set (PASID, multiple page table support,
advanced iommufd support, nesting, etc). Additional patches will be needed
to achieve this.
Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
---
drivers/iommu/amd/iommu.c | 9 ++++-----
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 9 ++++-----
drivers/iommu/intel/iommu.c | 10 +++-------
drivers/iommu/iommu.c | 4 ++--
drivers/iommu/iommufd/hw_pagetable.c | 8 ++++----
drivers/iommu/iommufd/selftest.c | 10 +++-------
include/linux/iommu.h | 20 ++++++++++++--------
7 files changed, 32 insertions(+), 38 deletions(-)
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 5ce8e6504ba7ee..3f691e1fd22ce4 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2407,9 +2407,8 @@ static struct iommu_domain *amd_iommu_domain_alloc(unsigned int type)
}
static struct iommu_domain *
-amd_iommu_domain_alloc_user(struct device *dev, u32 flags,
- struct iommu_domain *parent,
- const struct iommu_user_data *user_data)
+amd_iommu_domain_alloc_paging_flags(struct device *dev, u32 flags,
+ const struct iommu_user_data *user_data)
{
unsigned int type = IOMMU_DOMAIN_UNMANAGED;
@@ -2420,7 +2419,7 @@ amd_iommu_domain_alloc_user(struct device *dev, u32 flags,
if (dev)
iommu = get_amd_iommu_from_dev(dev);
- if ((flags & ~supported_flags) || parent || user_data)
+ if ((flags & ~supported_flags) || user_data)
return ERR_PTR(-EOPNOTSUPP);
/* Allocate domain with v2 page table if IOMMU supports PASID. */
@@ -2884,7 +2883,7 @@ const struct iommu_ops amd_iommu_ops = {
.release_domain = &release_domain,
.identity_domain = &identity_domain.domain,
.domain_alloc = amd_iommu_domain_alloc,
- .domain_alloc_user = amd_iommu_domain_alloc_user,
+ .domain_alloc_paging_flags = amd_iommu_domain_alloc_paging_flags,
.domain_alloc_sva = amd_iommu_domain_alloc_sva,
.probe_device = amd_iommu_probe_device,
.release_device = amd_iommu_release_device,
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 04630dbfedd92a..e4ebd9e12ad468 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3132,9 +3132,8 @@ static struct iommu_domain arm_smmu_blocked_domain = {
};
static struct iommu_domain *
-arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
- struct iommu_domain *parent,
- const struct iommu_user_data *user_data)
+arm_smmu_domain_alloc_paging_flags(struct device *dev, u32 flags,
+ const struct iommu_user_data *user_data)
{
struct arm_smmu_master *master = dev_iommu_priv_get(dev);
const u32 PAGING_FLAGS = IOMMU_HWPT_ALLOC_DIRTY_TRACKING |
@@ -3145,7 +3144,7 @@ arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
if (flags & ~PAGING_FLAGS)
return ERR_PTR(-EOPNOTSUPP);
- if (parent || user_data)
+ if (user_data)
return ERR_PTR(-EOPNOTSUPP);
if (flags & IOMMU_HWPT_ALLOC_PASID)
@@ -3546,7 +3545,7 @@ static struct iommu_ops arm_smmu_ops = {
.hw_info = arm_smmu_hw_info,
.domain_alloc_paging = arm_smmu_domain_alloc_paging,
.domain_alloc_sva = arm_smmu_sva_domain_alloc,
- .domain_alloc_user = arm_smmu_domain_alloc_user,
+ .domain_alloc_paging_flags = arm_smmu_domain_alloc_paging_flags,
.probe_device = arm_smmu_probe_device,
.release_device = arm_smmu_release_device,
.device_group = arm_smmu_device_group,
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 6f11a075114f7a..7d0acb74d5a543 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3328,9 +3328,8 @@ static struct dmar_domain *paging_domain_alloc(struct device *dev, bool first_st
}
static struct iommu_domain *
-intel_iommu_domain_alloc_user(struct device *dev, u32 flags,
- struct iommu_domain *parent,
- const struct iommu_user_data *user_data)
+intel_iommu_domain_alloc_paging_flags(struct device *dev, u32 flags,
+ const struct iommu_user_data *user_data)
{
struct device_domain_info *info = dev_iommu_priv_get(dev);
bool dirty_tracking = flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
@@ -3340,9 +3339,6 @@ intel_iommu_domain_alloc_user(struct device *dev, u32 flags,
struct iommu_domain *domain;
bool first_stage;
- if (parent)
- return ERR_PTR(-EOPNOTSUPP);
-
if (flags &
(~(IOMMU_HWPT_ALLOC_NEST_PARENT | IOMMU_HWPT_ALLOC_DIRTY_TRACKING
| IOMMU_HWPT_FAULT_ID_VALID)))
@@ -4468,7 +4464,7 @@ const struct iommu_ops intel_iommu_ops = {
.identity_domain = &identity_domain,
.capable = intel_iommu_capable,
.hw_info = intel_iommu_hw_info,
- .domain_alloc_user = intel_iommu_domain_alloc_user,
+ .domain_alloc_paging_flags = intel_iommu_domain_alloc_paging_flags,
.domain_alloc_sva = intel_svm_domain_alloc,
.domain_alloc_paging = intel_iommu_domain_alloc_paging,
.domain_alloc_nested = intel_iommu_domain_alloc_nested,
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 7618e9c65d3fa8..9bc0c74cca3c7e 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1987,8 +1987,8 @@ __iommu_paging_domain_alloc_flags(struct device *dev, unsigned int type,
if (ops->domain_alloc_paging && !flags)
domain = ops->domain_alloc_paging(dev);
- else if (ops->domain_alloc_user)
- domain = ops->domain_alloc_user(dev, flags, NULL, NULL);
+ else if (ops->domain_alloc_paging_flags)
+ domain = ops->domain_alloc_paging_flags(dev, flags, NULL);
else if (ops->domain_alloc && !flags)
domain = ops->domain_alloc(IOMMU_DOMAIN_UNMANAGED);
else
diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/hw_pagetable.c
index ec3c64a8c79633..ce03c380465154 100644
--- a/drivers/iommu/iommufd/hw_pagetable.c
+++ b/drivers/iommu/iommufd/hw_pagetable.c
@@ -119,7 +119,7 @@ iommufd_hwpt_paging_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
lockdep_assert_held(&ioas->mutex);
- if ((flags || user_data) && !ops->domain_alloc_user)
+ if ((flags || user_data) && !ops->domain_alloc_paging_flags)
return ERR_PTR(-EOPNOTSUPP);
if (flags & ~valid_flags)
return ERR_PTR(-EOPNOTSUPP);
@@ -139,9 +139,9 @@ iommufd_hwpt_paging_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
hwpt_paging->ioas = ioas;
hwpt_paging->nest_parent = flags & IOMMU_HWPT_ALLOC_NEST_PARENT;
- if (ops->domain_alloc_user) {
- hwpt->domain = ops->domain_alloc_user(idev->dev, flags, NULL,
- user_data);
+ if (ops->domain_alloc_paging_flags) {
+ hwpt->domain = ops->domain_alloc_paging_flags(idev->dev, flags,
+ user_data);
if (IS_ERR(hwpt->domain)) {
rc = PTR_ERR(hwpt->domain);
hwpt->domain = NULL;
diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index c58083c3660aee..a0de6d6d4e689c 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -379,9 +379,8 @@ mock_domain_alloc_nested(struct device *dev, struct iommu_domain *parent,
}
static struct iommu_domain *
-mock_domain_alloc_user(struct device *dev, u32 flags,
- struct iommu_domain *parent,
- const struct iommu_user_data *user_data)
+mock_domain_alloc_paging_flags(struct device *dev, u32 flags,
+ const struct iommu_user_data *user_data)
{
bool has_dirty_flag = flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
const u32 PAGING_FLAGS = IOMMU_HWPT_ALLOC_DIRTY_TRACKING |
@@ -390,9 +389,6 @@ mock_domain_alloc_user(struct device *dev, u32 flags,
MOCK_FLAGS_DEVICE_NO_DIRTY;
struct iommu_domain *domain;
- if (parent)
- return ERR_PTR(-EOPNOTSUPP);
-
if (user_data)
return ERR_PTR(-EOPNOTSUPP);
if ((flags & ~PAGING_FLAGS) || (has_dirty_flag && no_dirty_ops))
@@ -718,7 +714,7 @@ static const struct iommu_ops mock_ops = {
.pgsize_bitmap = MOCK_IO_PAGE_SIZE,
.hw_info = mock_domain_hw_info,
.domain_alloc_paging = mock_domain_alloc_paging,
- .domain_alloc_user = mock_domain_alloc_user,
+ .domain_alloc_paging_flags = mock_domain_alloc_paging_flags,
.domain_alloc_nested = mock_domain_alloc_nested,
.capable = mock_domain_capable,
.device_group = generic_device_group,
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 0472cc1245192d..1e3308e899969d 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -557,13 +557,17 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size,
* @domain_alloc: allocate and return an iommu domain if success. Otherwise
* NULL is returned. The domain is not fully initialized until
* the caller iommu_domain_alloc() returns.
- * @domain_alloc_user: Allocate an iommu domain corresponding to the input
- * parameters as defined in include/uapi/linux/iommufd.h.
- * The @user_data can be optionally provided, the
- * new domain must support __IOMMU_DOMAIN_PAGING.
- * Upon failure, ERR_PTR must be returned.
+ * @domain_alloc_paging_flags: Allocate an iommu domain corresponding to the
+ * input parameters as defined in
+ * include/uapi/linux/iommufd.h. The @user_data can be
+ * optionally provided, the new domain must support
+ * __IOMMU_DOMAIN_PAGING. Upon failure, ERR_PTR must be
+ * returned.
* @domain_alloc_paging: Allocate an iommu_domain that can be used for
- * UNMANAGED, DMA, and DMA_FQ domain types.
+ * UNMANAGED, DMA, and DMA_FQ domain types. This is the
+ * same as invoking domain_alloc_paging_flags() with
+ * @flags=0, @user_data=NULL. A driver should implement
+ * only one of the two ops.
* @domain_alloc_sva: Allocate an iommu_domain for Shared Virtual Addressing.
* @domain_alloc_nested: Allocate an iommu_domain for nested translation.
* @probe_device: Add device to iommu driver handling
@@ -614,8 +618,8 @@ struct iommu_ops {
/* Domain allocation and freeing by the iommu driver */
struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type);
- struct iommu_domain *(*domain_alloc_user)(
- struct device *dev, u32 flags, struct iommu_domain *parent,
+ struct iommu_domain *(*domain_alloc_paging_flags)(
+ struct device *dev, u32 flags,
const struct iommu_user_data *user_data);
struct iommu_domain *(*domain_alloc_paging)(struct device *dev);
struct iommu_domain *(*domain_alloc_sva)(struct device *dev,
--
2.43.0
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