This is part of the consolidated iommu page table work, it brings the allocator I previously sketched to all drivers. iommu-pages is a small abstraction for allocating page table pages that iommu drivers use. It has a few properties that distinguish it from the other allocators in the kernel: - Allocations are always power of two, and always physically aligned to their size - Allocations can be threaded on a list, in atomic contexts without memory allocations. The list is only used for freeing batch of pages (ie after IOTLB flush as the mm does) - Allocations are accounted for in the secondary page table counters - Allocations can sometimes be less than a full CPU page, 1/4 and 1/16 are some common sub page allocation sizes. - Allocations can sometimes be multiple CPU pages - In future I'd like atomic-safe RCU free of the page lists, as the mm does Make the API tighter and leak fewer internal details to the callers. Particularly this series aims to remove all struct page usage related to iommu-pages memory from all drivers, this is things such as: struct page virt_to_page() page_to_virt() page_to_pfn() pfn_to_page() dma_map_page() page_address() page->lru Once drivers no longer use struct page convert iommu-pages to folios and use a private memory descriptor. This should help prepare iommu for Matthew's memdesc project and clears the way to using more space in the struct page for iommu-pages features in future. Improve the API to work directly on sizes instead of order, the drivers generally have HW specs and code paths that already have specific sizes. Pass those sizes down into the allocator to remove some boiler plate get_order() in drivers. This is cleanup to be ready for a possible sub page allocator some day. This is on github: https://github.com/jgunthorpe/linux/commits/iommu_pages v2: - Use struct tegra_pd instead of u32 * - Use dma_unmap_single() instead of unmap_page in tegra - Fix Tegra SIZE_PT typo - Use iommu_free_pages() as the free function name instead of iommu_free_page() - Remove numa_node_id() and use the NUMA_NO_NODE path with numa_mem_id() - Make all the allocation APIs use size only, fully remove order and lg2 versions - Round up the riscv queue size, use SZ_4K in riscv not PAGE_SIZE - Convert AMD to use kvalloc for CPU memory and fix the device table to round up to 4K - Use PAGE_ALIGN instead of get_order in AMD iommu_alloc_4k_pages() v1: https://patch.msgid.link/r/0-v1-416f64558c7c+2a5-iommu_pages_jgg@xxxxxxxxxx Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Jason Gunthorpe (23): iommu/terga: Do not use struct page as the handle for as->pd memory iommu/tegra: Do not use struct page as the handle for pts iommu/pages: Remove __iommu_alloc_pages()/__iommu_free_pages() iommu/pages: Make iommu_put_pages_list() work with high order allocations iommu/pages: Remove the order argument to iommu_free_pages() iommu/pages: Remove iommu_free_page() iommu/pages: De-inline the substantial functions iommu/vtd: Use virt_to_phys() iommu/pages: Formalize the freelist API iommu/riscv: Convert to use struct iommu_pages_list iommu/amd: Convert to use struct iommu_pages_list iommu: Change iommu_iotlb_gather to use iommu_page_list iommu/pages: Remove iommu_put_pages_list_old and the _Generic iommu/pages: Move from struct page to struct ioptdesc and folio iommu/pages: Move the __GFP_HIGHMEM checks into the common code iommu/pages: Allow sub page sizes to be passed into the allocator iommu/amd: Change rlookup, irq_lookup, and alias to use kvalloc() iommu/amd: Use roundup_pow_two() instead of get_order() iommu/riscv: Update to use iommu_alloc_pages_node_lg2() iommu: Update various drivers to pass in lg2sz instead of order to iommu pages iommu/pages: Remove iommu_alloc_page/pages() iommu/pages: Remove iommu_alloc_page_node() iommu/pages: Remove iommu_alloc_pages_node() drivers/iommu/Makefile | 1 + drivers/iommu/amd/amd_iommu_types.h | 8 -- drivers/iommu/amd/init.c | 91 +++++------- drivers/iommu/amd/io_pgtable.c | 38 +++-- drivers/iommu/amd/io_pgtable_v2.c | 12 +- drivers/iommu/amd/iommu.c | 6 +- drivers/iommu/amd/ppr.c | 2 +- drivers/iommu/dma-iommu.c | 9 +- drivers/iommu/exynos-iommu.c | 12 +- drivers/iommu/intel/dmar.c | 10 +- drivers/iommu/intel/iommu.c | 52 +++---- drivers/iommu/intel/iommu.h | 26 +--- drivers/iommu/intel/irq_remapping.c | 11 +- drivers/iommu/intel/pasid.c | 13 +- drivers/iommu/intel/pasid.h | 1 - drivers/iommu/intel/prq.c | 7 +- drivers/iommu/io-pgtable-arm.c | 9 +- drivers/iommu/io-pgtable-dart.c | 23 +-- drivers/iommu/iommu-pages.c | 117 +++++++++++++++ drivers/iommu/iommu-pages.h | 211 +++++++++------------------- drivers/iommu/riscv/iommu.c | 43 +++--- drivers/iommu/rockchip-iommu.c | 14 +- drivers/iommu/sun50i-iommu.c | 6 +- drivers/iommu/tegra-smmu.c | 111 ++++++++------- include/linux/iommu.h | 16 ++- 25 files changed, 425 insertions(+), 424 deletions(-) create mode 100644 drivers/iommu/iommu-pages.c base-commit: 2014c95afecee3e76ca4a56956a936e23283f05b -- 2.43.0
