/* * Generic page table allocator for IOMMUs. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * Copyright (C) 2014 ARM Limited * * Author: Will Deacon <will.deacon@arm.com> */ #include <linux/bug.h> #include <linux/io-pgtable.h> #include <linux/kernel.h> #include <linux/types.h> static const struct io_pgtable_init_fns * io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] = { #ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE [ARM_32_LPAE_S1] = &io_pgtable_arm_32_lpae_s1_init_fns, [ARM_32_LPAE_S2] = &io_pgtable_arm_32_lpae_s2_init_fns, [ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns, [ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns, #endif #ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S [ARM_V7S] = &io_pgtable_arm_v7s_init_fns, #endif }; struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt, struct io_pgtable_cfg *cfg, void *cookie) { struct io_pgtable *iop; const struct io_pgtable_init_fns *fns; if (fmt >= IO_PGTABLE_NUM_FMTS) return NULL; fns = io_pgtable_init_table[fmt]; if (!fns) return NULL; iop = fns->alloc(cfg, cookie); if (!iop) return NULL; iop->fmt = fmt; iop->cookie = cookie; iop->cfg = *cfg; return &iop->ops; } EXPORT_SYMBOL_GPL(alloc_io_pgtable_ops); /* * It is the IOMMU driver's responsibility to ensure that the page table * is no longer accessible to the walker by this point. */ void free_io_pgtable_ops(struct io_pgtable_ops *ops) { struct io_pgtable *iop; if (!ops) return; iop = container_of(ops, struct io_pgtable, ops); io_pgtable_tlb_flush_all(iop); io_pgtable_init_table[iop->fmt]->free(iop); } EXPORT_SYMBOL_GPL(free_io_pgtable_ops);