[PATCH v2 00/14] iommufd: Prepare for IOMMUFD_OBJ_HW_QUEUE

[Nicolin Chen <nicolinc@nvidia.com>]

The new HW Queue object will require more interactions with IOMMU drivers,
with a few more for-driver APIs. This will complicate the driver-allocated
structure design like the viommu_alloc op: since the core structure is not
initialized during the driver allocation stage, a new for-driver API can't
reference any member in the core vIOMMU structure.

[before]
core:	viommu = ops->viommu_alloc();
driver:	// my_viommu is successfully allocated
driver:	my_viommu = iommufd_viommu_alloc(...);
driver:	// This may crash if it reads viommu->ictx
driver:	new = iommufd_new_viommu_helper(my_viommu->core ...);
core:	viommu->ictx = ucmd->ictx;
core:	...

Make a preparatory series doing:
 1 Replace viommu_alloc design with get_viommu_size + viommu_init
 2 Add a new iommufd_object_alloc_ucmd
 3 Cosmetic fixes and clean ups

[after 1]
core:	viommu = ops->get_viommu_size();
driver:	return VIOMMU_STRUCT_SIZE();
core:	viommu->ictx = ucmd->ictx; // and others
core:	rc = ops->viommu_init();
driver:	// This is safe now as viommu->ictx is inited
driver:	new = iommufd_new_viommu_helper(my_viommu->core ...);
core:	...

Some of the patches are included from:
[PATCH v5 00/29] iommufd: Add vIOMMU infrastructure (Part-4 HW QUEUE)
https://lore.kernel.org/all/cover.1747537752.git.nicolinc@nvidia.com/

This is on Github:
https://github.com/nicolinc/iommufd/commits/iommufd_hw_queue-prep-v2

Changelog
v2
 * Add Reviewed-by from Kevin and Jason
 * Drop unused mock_nested->parent
 * Revise commit messages and kdocs
 * Add WARN_ON if new_obj is already set
 * Re-organize the patches replacing viommu_alloc
 * Use EOPNOTSUPP for failures due to driver bugs
 * Return size_t for get_viommu_size op (0 means EOPNOTSUPP)
v1
 https://lore.kernel.org/all/cover.1749488870.git.nicolinc@nvidia.com/

Thanks
Nicolin

Nicolin Chen (14):
  iommufd: Apply obvious cosmetic fixes
  iommufd: Drop unused ictx in struct iommufd_vdevice
  iommufd: Use enum iommu_viommu_type for type in struct iommufd_viommu
  iommufd: Use enum iommu_veventq_type for type in struct
    iommufd_veventq
  iommufd: Return EOPNOTSUPP for failures due to driver bugs
  iommu: Introduce get_viommu_size and viommu_init ops
  iommufd/viommu: Support get_viommu_size and viommu_init ops
  iommufd/selftest: Drop parent domain from mock_iommu_domain_nested
  iommufd/selftest: Replace mock_viommu_alloc with mock_viommu_init
  iommu/arm-smmu-v3: Replace arm_vsmmu_alloc with arm_vsmmu_init
  iommu: Deprecate viommu_alloc op
  iommufd: Move _iommufd_object_alloc out of driver.c
  iommufd: Introduce iommufd_object_alloc_ucmd helper
  iommufd: Apply the new iommufd_object_alloc_ucmd helper

 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   | 11 ++--
 drivers/iommu/iommufd/io_pagetable.h          |  2 +-
 drivers/iommu/iommufd/iommufd_private.h       | 42 ++++++++++---
 include/linux/iommu.h                         | 26 ++++----
 include/linux/iommufd.h                       | 39 +++---------
 .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c     | 46 +++++++-------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   |  3 +-
 drivers/iommu/iommufd/device.c                |  5 +-
 drivers/iommu/iommufd/driver.c                | 33 ----------
 drivers/iommu/iommufd/eventq.c                | 14 ++---
 drivers/iommu/iommufd/hw_pagetable.c          | 10 ++-
 drivers/iommu/iommufd/io_pagetable.c          |  3 +-
 drivers/iommu/iommufd/iova_bitmap.c           |  1 -
 drivers/iommu/iommufd/main.c                  | 63 +++++++++++++++++--
 drivers/iommu/iommufd/pages.c                 |  9 ++-
 drivers/iommu/iommufd/selftest.c              | 56 ++++++++---------
 drivers/iommu/iommufd/viommu.c                | 48 +++++++++-----
 17 files changed, 222 insertions(+), 189 deletions(-)

-- 
2.43.0