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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Generic page table allocator for IOMMUs.
- *
- * 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,
- [ARM_MALI_LPAE] = &io_pgtable_arm_mali_lpae_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 = io_pgtable_ops_to_pgtable(ops);
- io_pgtable_tlb_flush_all(iop);
- io_pgtable_init_table[iop->fmt]->free(iop);
- }
- EXPORT_SYMBOL_GPL(free_io_pgtable_ops);
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