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author | Jason Gunthorpe <jgg@nvidia.com> | 2022-11-29 16:29:34 -0400 |
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committer | Jason Gunthorpe <jgg@nvidia.com> | 2022-11-30 20:16:49 -0400 |
commit | aad37e71d5c4dc1d3c25734f0bcd51c324f94b5e (patch) | |
tree | c835636d8c2f03f720aaa0549dd97bc46fed8060 /drivers/iommu/iommufd/main.c | |
parent | 51fe6141f0f64ae0bbc096a41a07572273e8c0ef (diff) | |
download | linux-stable-aad37e71d5c4dc1d3c25734f0bcd51c324f94b5e.tar.gz linux-stable-aad37e71d5c4dc1d3c25734f0bcd51c324f94b5e.tar.bz2 linux-stable-aad37e71d5c4dc1d3c25734f0bcd51c324f94b5e.zip |
iommufd: IOCTLs for the io_pagetable
Connect the IOAS to its IOCTL interface. This exposes most of the
functionality in the io_pagetable to userspace.
This is intended to be the core of the generic interface that IOMMUFD will
provide. Every IOMMU driver should be able to implement an iommu_domain
that is compatible with this generic mechanism.
It is also designed to be easy to use for simple non virtual machine
monitor users, like DPDK:
- Universal simple support for all IOMMUs (no PPC special path)
- An IOVA allocator that considers the aperture and the allowed/reserved
ranges
- io_pagetable allows any number of iommu_domains to be connected to the
IOAS
- Automatic allocation and re-use of iommu_domains
Along with room in the design to add non-generic features to cater to
specific HW functionality.
Link: https://lore.kernel.org/r/11-v6-a196d26f289e+11787-iommufd_jgg@nvidia.com
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Lixiao Yang <lixiao.yang@intel.com>
Tested-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Diffstat (limited to 'drivers/iommu/iommufd/main.c')
-rw-r--r-- | drivers/iommu/iommufd/main.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index dfbc68b97506..1c0a1f499378 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -204,8 +204,39 @@ static int iommufd_fops_release(struct inode *inode, struct file *filp) return 0; } +static int iommufd_option(struct iommufd_ucmd *ucmd) +{ + struct iommu_option *cmd = ucmd->cmd; + int rc; + + if (cmd->__reserved) + return -EOPNOTSUPP; + + switch (cmd->option_id) { + case IOMMU_OPTION_RLIMIT_MODE: + rc = iommufd_option_rlimit_mode(cmd, ucmd->ictx); + break; + case IOMMU_OPTION_HUGE_PAGES: + rc = iommufd_ioas_option(ucmd); + break; + default: + return -EOPNOTSUPP; + } + if (rc) + return rc; + if (copy_to_user(&((struct iommu_option __user *)ucmd->ubuffer)->val64, + &cmd->val64, sizeof(cmd->val64))) + return -EFAULT; + return 0; +} + union ucmd_buffer { struct iommu_destroy destroy; + struct iommu_ioas_alloc alloc; + struct iommu_ioas_allow_iovas allow_iovas; + struct iommu_ioas_iova_ranges iova_ranges; + struct iommu_ioas_map map; + struct iommu_ioas_unmap unmap; }; struct iommufd_ioctl_op { @@ -226,6 +257,20 @@ struct iommufd_ioctl_op { } static const struct iommufd_ioctl_op iommufd_ioctl_ops[] = { IOCTL_OP(IOMMU_DESTROY, iommufd_destroy, struct iommu_destroy, id), + IOCTL_OP(IOMMU_IOAS_ALLOC, iommufd_ioas_alloc_ioctl, + struct iommu_ioas_alloc, out_ioas_id), + IOCTL_OP(IOMMU_IOAS_ALLOW_IOVAS, iommufd_ioas_allow_iovas, + struct iommu_ioas_allow_iovas, allowed_iovas), + IOCTL_OP(IOMMU_IOAS_COPY, iommufd_ioas_copy, struct iommu_ioas_copy, + src_iova), + IOCTL_OP(IOMMU_IOAS_IOVA_RANGES, iommufd_ioas_iova_ranges, + struct iommu_ioas_iova_ranges, out_iova_alignment), + IOCTL_OP(IOMMU_IOAS_MAP, iommufd_ioas_map, struct iommu_ioas_map, + iova), + IOCTL_OP(IOMMU_IOAS_UNMAP, iommufd_ioas_unmap, struct iommu_ioas_unmap, + length), + IOCTL_OP(IOMMU_OPTION, iommufd_option, struct iommu_option, + val64), }; static long iommufd_fops_ioctl(struct file *filp, unsigned int cmd, @@ -312,6 +357,9 @@ void iommufd_ctx_put(struct iommufd_ctx *ictx) EXPORT_SYMBOL_NS_GPL(iommufd_ctx_put, IOMMUFD); static const struct iommufd_object_ops iommufd_object_ops[] = { + [IOMMUFD_OBJ_IOAS] = { + .destroy = iommufd_ioas_destroy, + }, }; static struct miscdevice iommu_misc_dev = { |