diff options
Diffstat (limited to 'drivers/iommu/iommufd/io_pagetable.c')
| -rw-r--r-- | drivers/iommu/iommufd/io_pagetable.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/drivers/iommu/iommufd/io_pagetable.c b/drivers/iommu/iommufd/io_pagetable.c index 117a39ae2e..504ac1b01b 100644 --- a/drivers/iommu/iommufd/io_pagetable.c +++ b/drivers/iommu/iommufd/io_pagetable.c @@ -15,6 +15,7 @@ #include <linux/err.h> #include <linux/slab.h> #include <linux/errno.h> +#include <uapi/linux/iommufd.h> #include "io_pagetable.h" #include "double_span.h" @@ -424,6 +425,177 @@ int iopt_map_user_pages(struct iommufd_ctx *ictx, struct io_pagetable *iopt, return 0; } +struct iova_bitmap_fn_arg { + unsigned long flags; + struct io_pagetable *iopt; + struct iommu_domain *domain; + struct iommu_dirty_bitmap *dirty; +}; + +static int __iommu_read_and_clear_dirty(struct iova_bitmap *bitmap, + unsigned long iova, size_t length, + void *opaque) +{ + struct iopt_area *area; + struct iopt_area_contig_iter iter; + struct iova_bitmap_fn_arg *arg = opaque; + struct iommu_domain *domain = arg->domain; + struct iommu_dirty_bitmap *dirty = arg->dirty; + const struct iommu_dirty_ops *ops = domain->dirty_ops; + unsigned long last_iova = iova + length - 1; + unsigned long flags = arg->flags; + int ret; + + iopt_for_each_contig_area(&iter, area, arg->iopt, iova, last_iova) { + unsigned long last = min(last_iova, iopt_area_last_iova(area)); + + ret = ops->read_and_clear_dirty(domain, iter.cur_iova, + last - iter.cur_iova + 1, flags, + dirty); + if (ret) + return ret; + } + + if (!iopt_area_contig_done(&iter)) + return -EINVAL; + return 0; +} + +static int +iommu_read_and_clear_dirty(struct iommu_domain *domain, + struct io_pagetable *iopt, unsigned long flags, + struct iommu_hwpt_get_dirty_bitmap *bitmap) +{ + const struct iommu_dirty_ops *ops = domain->dirty_ops; + struct iommu_iotlb_gather gather; + struct iommu_dirty_bitmap dirty; + struct iova_bitmap_fn_arg arg; + struct iova_bitmap *iter; + int ret = 0; + + if (!ops || !ops->read_and_clear_dirty) + return -EOPNOTSUPP; + + iter = iova_bitmap_alloc(bitmap->iova, bitmap->length, + bitmap->page_size, + u64_to_user_ptr(bitmap->data)); + if (IS_ERR(iter)) + return -ENOMEM; + + iommu_dirty_bitmap_init(&dirty, iter, &gather); + + arg.flags = flags; + arg.iopt = iopt; + arg.domain = domain; + arg.dirty = &dirty; + iova_bitmap_for_each(iter, &arg, __iommu_read_and_clear_dirty); + + if (!(flags & IOMMU_DIRTY_NO_CLEAR)) + iommu_iotlb_sync(domain, &gather); + + iova_bitmap_free(iter); + + return ret; +} + +int iommufd_check_iova_range(struct io_pagetable *iopt, + struct iommu_hwpt_get_dirty_bitmap *bitmap) +{ + size_t iommu_pgsize = iopt->iova_alignment; + u64 last_iova; + + if (check_add_overflow(bitmap->iova, bitmap->length - 1, &last_iova)) + return -EOVERFLOW; + + if (bitmap->iova > ULONG_MAX || last_iova > ULONG_MAX) + return -EOVERFLOW; + + if ((bitmap->iova & (iommu_pgsize - 1)) || + ((last_iova + 1) & (iommu_pgsize - 1))) + return -EINVAL; + + if (!bitmap->page_size) + return -EINVAL; + + if ((bitmap->iova & (bitmap->page_size - 1)) || + ((last_iova + 1) & (bitmap->page_size - 1))) + return -EINVAL; + + return 0; +} + +int iopt_read_and_clear_dirty_data(struct io_pagetable *iopt, + struct iommu_domain *domain, + unsigned long flags, + struct iommu_hwpt_get_dirty_bitmap *bitmap) +{ + int ret; + + ret = iommufd_check_iova_range(iopt, bitmap); + if (ret) + return ret; + + down_read(&iopt->iova_rwsem); + ret = iommu_read_and_clear_dirty(domain, iopt, flags, bitmap); + up_read(&iopt->iova_rwsem); + + return ret; +} + +static int iopt_clear_dirty_data(struct io_pagetable *iopt, + struct iommu_domain *domain) +{ + const struct iommu_dirty_ops *ops = domain->dirty_ops; + struct iommu_iotlb_gather gather; + struct iommu_dirty_bitmap dirty; + struct iopt_area *area; + int ret = 0; + + lockdep_assert_held_read(&iopt->iova_rwsem); + + iommu_dirty_bitmap_init(&dirty, NULL, &gather); + + for (area = iopt_area_iter_first(iopt, 0, ULONG_MAX); area; + area = iopt_area_iter_next(area, 0, ULONG_MAX)) { + if (!area->pages) + continue; + + ret = ops->read_and_clear_dirty(domain, iopt_area_iova(area), + iopt_area_length(area), 0, + &dirty); + if (ret) + break; + } + + iommu_iotlb_sync(domain, &gather); + return ret; +} + +int iopt_set_dirty_tracking(struct io_pagetable *iopt, + struct iommu_domain *domain, bool enable) +{ + const struct iommu_dirty_ops *ops = domain->dirty_ops; + int ret = 0; + + if (!ops) + return -EOPNOTSUPP; + + down_read(&iopt->iova_rwsem); + + /* Clear dirty bits from PTEs to ensure a clean snapshot */ + if (enable) { + ret = iopt_clear_dirty_data(iopt, domain); + if (ret) + goto out_unlock; + } + + ret = ops->set_dirty_tracking(domain, enable); + +out_unlock: + up_read(&iopt->iova_rwsem); + return ret; +} + int iopt_get_pages(struct io_pagetable *iopt, unsigned long iova, unsigned long length, struct list_head *pages_list) { |