![Bhumika Goyal](/assets/img/avatar_default.png)
Check for iommu_gather_ops structures that are only stored in the tlb field of an io_pgtable_cfg structure. The tlb field is of type const struct iommu_gather_ops *, so iommu_gather_ops structures having this property can be declared as const. Also, replace __initdata with __initconst. Acked-by: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Bhumika Goyal <bhumirks@gmail.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
1082 lines
28 KiB
C
1082 lines
28 KiB
C
/*
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* CPU-agnostic ARM page table allocator.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright (C) 2014 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt
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#include <linux/iommu.h>
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#include <linux/kernel.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <asm/barrier.h>
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#include "io-pgtable.h"
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#define ARM_LPAE_MAX_ADDR_BITS 48
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#define ARM_LPAE_S2_MAX_CONCAT_PAGES 16
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#define ARM_LPAE_MAX_LEVELS 4
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/* Struct accessors */
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#define io_pgtable_to_data(x) \
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container_of((x), struct arm_lpae_io_pgtable, iop)
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#define io_pgtable_ops_to_data(x) \
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io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
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/*
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* For consistency with the architecture, we always consider
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* ARM_LPAE_MAX_LEVELS levels, with the walk starting at level n >=0
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*/
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#define ARM_LPAE_START_LVL(d) (ARM_LPAE_MAX_LEVELS - (d)->levels)
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/*
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* Calculate the right shift amount to get to the portion describing level l
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* in a virtual address mapped by the pagetable in d.
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*/
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#define ARM_LPAE_LVL_SHIFT(l,d) \
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((((d)->levels - ((l) - ARM_LPAE_START_LVL(d) + 1)) \
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* (d)->bits_per_level) + (d)->pg_shift)
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#define ARM_LPAE_GRANULE(d) (1UL << (d)->pg_shift)
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#define ARM_LPAE_PAGES_PER_PGD(d) \
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DIV_ROUND_UP((d)->pgd_size, ARM_LPAE_GRANULE(d))
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/*
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* Calculate the index at level l used to map virtual address a using the
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* pagetable in d.
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*/
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#define ARM_LPAE_PGD_IDX(l,d) \
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((l) == ARM_LPAE_START_LVL(d) ? ilog2(ARM_LPAE_PAGES_PER_PGD(d)) : 0)
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#define ARM_LPAE_LVL_IDX(a,l,d) \
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(((u64)(a) >> ARM_LPAE_LVL_SHIFT(l,d)) & \
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((1 << ((d)->bits_per_level + ARM_LPAE_PGD_IDX(l,d))) - 1))
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/* Calculate the block/page mapping size at level l for pagetable in d. */
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#define ARM_LPAE_BLOCK_SIZE(l,d) \
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(1 << (ilog2(sizeof(arm_lpae_iopte)) + \
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((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level)))
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/* Page table bits */
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#define ARM_LPAE_PTE_TYPE_SHIFT 0
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#define ARM_LPAE_PTE_TYPE_MASK 0x3
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#define ARM_LPAE_PTE_TYPE_BLOCK 1
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#define ARM_LPAE_PTE_TYPE_TABLE 3
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#define ARM_LPAE_PTE_TYPE_PAGE 3
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#define ARM_LPAE_PTE_NSTABLE (((arm_lpae_iopte)1) << 63)
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#define ARM_LPAE_PTE_XN (((arm_lpae_iopte)3) << 53)
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#define ARM_LPAE_PTE_AF (((arm_lpae_iopte)1) << 10)
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#define ARM_LPAE_PTE_SH_NS (((arm_lpae_iopte)0) << 8)
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#define ARM_LPAE_PTE_SH_OS (((arm_lpae_iopte)2) << 8)
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#define ARM_LPAE_PTE_SH_IS (((arm_lpae_iopte)3) << 8)
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#define ARM_LPAE_PTE_NS (((arm_lpae_iopte)1) << 5)
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#define ARM_LPAE_PTE_VALID (((arm_lpae_iopte)1) << 0)
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#define ARM_LPAE_PTE_ATTR_LO_MASK (((arm_lpae_iopte)0x3ff) << 2)
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/* Ignore the contiguous bit for block splitting */
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#define ARM_LPAE_PTE_ATTR_HI_MASK (((arm_lpae_iopte)6) << 52)
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#define ARM_LPAE_PTE_ATTR_MASK (ARM_LPAE_PTE_ATTR_LO_MASK | \
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ARM_LPAE_PTE_ATTR_HI_MASK)
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/* Stage-1 PTE */
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#define ARM_LPAE_PTE_AP_UNPRIV (((arm_lpae_iopte)1) << 6)
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#define ARM_LPAE_PTE_AP_RDONLY (((arm_lpae_iopte)2) << 6)
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#define ARM_LPAE_PTE_ATTRINDX_SHIFT 2
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#define ARM_LPAE_PTE_nG (((arm_lpae_iopte)1) << 11)
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/* Stage-2 PTE */
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#define ARM_LPAE_PTE_HAP_FAULT (((arm_lpae_iopte)0) << 6)
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#define ARM_LPAE_PTE_HAP_READ (((arm_lpae_iopte)1) << 6)
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#define ARM_LPAE_PTE_HAP_WRITE (((arm_lpae_iopte)2) << 6)
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#define ARM_LPAE_PTE_MEMATTR_OIWB (((arm_lpae_iopte)0xf) << 2)
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#define ARM_LPAE_PTE_MEMATTR_NC (((arm_lpae_iopte)0x5) << 2)
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#define ARM_LPAE_PTE_MEMATTR_DEV (((arm_lpae_iopte)0x1) << 2)
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/* Register bits */
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#define ARM_32_LPAE_TCR_EAE (1 << 31)
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#define ARM_64_LPAE_S2_TCR_RES1 (1 << 31)
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#define ARM_LPAE_TCR_EPD1 (1 << 23)
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#define ARM_LPAE_TCR_TG0_4K (0 << 14)
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#define ARM_LPAE_TCR_TG0_64K (1 << 14)
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#define ARM_LPAE_TCR_TG0_16K (2 << 14)
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#define ARM_LPAE_TCR_SH0_SHIFT 12
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#define ARM_LPAE_TCR_SH0_MASK 0x3
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#define ARM_LPAE_TCR_SH_NS 0
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#define ARM_LPAE_TCR_SH_OS 2
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#define ARM_LPAE_TCR_SH_IS 3
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#define ARM_LPAE_TCR_ORGN0_SHIFT 10
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#define ARM_LPAE_TCR_IRGN0_SHIFT 8
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#define ARM_LPAE_TCR_RGN_MASK 0x3
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#define ARM_LPAE_TCR_RGN_NC 0
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#define ARM_LPAE_TCR_RGN_WBWA 1
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#define ARM_LPAE_TCR_RGN_WT 2
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#define ARM_LPAE_TCR_RGN_WB 3
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#define ARM_LPAE_TCR_SL0_SHIFT 6
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#define ARM_LPAE_TCR_SL0_MASK 0x3
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#define ARM_LPAE_TCR_T0SZ_SHIFT 0
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#define ARM_LPAE_TCR_SZ_MASK 0xf
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#define ARM_LPAE_TCR_PS_SHIFT 16
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#define ARM_LPAE_TCR_PS_MASK 0x7
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#define ARM_LPAE_TCR_IPS_SHIFT 32
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#define ARM_LPAE_TCR_IPS_MASK 0x7
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#define ARM_LPAE_TCR_PS_32_BIT 0x0ULL
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#define ARM_LPAE_TCR_PS_36_BIT 0x1ULL
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#define ARM_LPAE_TCR_PS_40_BIT 0x2ULL
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#define ARM_LPAE_TCR_PS_42_BIT 0x3ULL
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#define ARM_LPAE_TCR_PS_44_BIT 0x4ULL
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#define ARM_LPAE_TCR_PS_48_BIT 0x5ULL
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#define ARM_LPAE_MAIR_ATTR_SHIFT(n) ((n) << 3)
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#define ARM_LPAE_MAIR_ATTR_MASK 0xff
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#define ARM_LPAE_MAIR_ATTR_DEVICE 0x04
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#define ARM_LPAE_MAIR_ATTR_NC 0x44
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#define ARM_LPAE_MAIR_ATTR_WBRWA 0xff
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#define ARM_LPAE_MAIR_ATTR_IDX_NC 0
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#define ARM_LPAE_MAIR_ATTR_IDX_CACHE 1
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#define ARM_LPAE_MAIR_ATTR_IDX_DEV 2
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/* IOPTE accessors */
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#define iopte_deref(pte,d) \
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(__va((pte) & ((1ULL << ARM_LPAE_MAX_ADDR_BITS) - 1) \
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& ~(ARM_LPAE_GRANULE(d) - 1ULL)))
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#define iopte_type(pte,l) \
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(((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK)
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#define iopte_prot(pte) ((pte) & ARM_LPAE_PTE_ATTR_MASK)
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#define iopte_leaf(pte,l) \
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(l == (ARM_LPAE_MAX_LEVELS - 1) ? \
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(iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_PAGE) : \
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(iopte_type(pte,l) == ARM_LPAE_PTE_TYPE_BLOCK))
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#define iopte_to_pfn(pte,d) \
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(((pte) & ((1ULL << ARM_LPAE_MAX_ADDR_BITS) - 1)) >> (d)->pg_shift)
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#define pfn_to_iopte(pfn,d) \
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(((pfn) << (d)->pg_shift) & ((1ULL << ARM_LPAE_MAX_ADDR_BITS) - 1))
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struct arm_lpae_io_pgtable {
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struct io_pgtable iop;
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int levels;
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size_t pgd_size;
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unsigned long pg_shift;
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unsigned long bits_per_level;
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void *pgd;
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};
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typedef u64 arm_lpae_iopte;
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static bool selftest_running = false;
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static dma_addr_t __arm_lpae_dma_addr(void *pages)
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{
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return (dma_addr_t)virt_to_phys(pages);
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}
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static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp,
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struct io_pgtable_cfg *cfg)
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{
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struct device *dev = cfg->iommu_dev;
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dma_addr_t dma;
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void *pages = alloc_pages_exact(size, gfp | __GFP_ZERO);
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if (!pages)
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return NULL;
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if (!selftest_running) {
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dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE);
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if (dma_mapping_error(dev, dma))
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goto out_free;
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/*
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* We depend on the IOMMU being able to work with any physical
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* address directly, so if the DMA layer suggests otherwise by
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* translating or truncating them, that bodes very badly...
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*/
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if (dma != virt_to_phys(pages))
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goto out_unmap;
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}
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return pages;
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out_unmap:
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dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n");
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dma_unmap_single(dev, dma, size, DMA_TO_DEVICE);
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out_free:
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free_pages_exact(pages, size);
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return NULL;
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}
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static void __arm_lpae_free_pages(void *pages, size_t size,
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struct io_pgtable_cfg *cfg)
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{
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if (!selftest_running)
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dma_unmap_single(cfg->iommu_dev, __arm_lpae_dma_addr(pages),
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size, DMA_TO_DEVICE);
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free_pages_exact(pages, size);
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}
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static void __arm_lpae_set_pte(arm_lpae_iopte *ptep, arm_lpae_iopte pte,
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struct io_pgtable_cfg *cfg)
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{
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*ptep = pte;
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if (!selftest_running)
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dma_sync_single_for_device(cfg->iommu_dev,
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__arm_lpae_dma_addr(ptep),
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sizeof(pte), DMA_TO_DEVICE);
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}
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static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
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unsigned long iova, size_t size, int lvl,
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arm_lpae_iopte *ptep);
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static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
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unsigned long iova, phys_addr_t paddr,
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arm_lpae_iopte prot, int lvl,
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arm_lpae_iopte *ptep)
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{
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arm_lpae_iopte pte = prot;
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struct io_pgtable_cfg *cfg = &data->iop.cfg;
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if (iopte_leaf(*ptep, lvl)) {
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/* We require an unmap first */
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WARN_ON(!selftest_running);
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return -EEXIST;
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} else if (iopte_type(*ptep, lvl) == ARM_LPAE_PTE_TYPE_TABLE) {
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/*
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* We need to unmap and free the old table before
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* overwriting it with a block entry.
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*/
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arm_lpae_iopte *tblp;
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size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
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tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
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if (WARN_ON(__arm_lpae_unmap(data, iova, sz, lvl, tblp) != sz))
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return -EINVAL;
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}
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if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
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pte |= ARM_LPAE_PTE_NS;
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if (lvl == ARM_LPAE_MAX_LEVELS - 1)
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pte |= ARM_LPAE_PTE_TYPE_PAGE;
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else
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pte |= ARM_LPAE_PTE_TYPE_BLOCK;
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pte |= ARM_LPAE_PTE_AF | ARM_LPAE_PTE_SH_IS;
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pte |= pfn_to_iopte(paddr >> data->pg_shift, data);
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__arm_lpae_set_pte(ptep, pte, cfg);
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return 0;
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}
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static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
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phys_addr_t paddr, size_t size, arm_lpae_iopte prot,
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int lvl, arm_lpae_iopte *ptep)
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{
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arm_lpae_iopte *cptep, pte;
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size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
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struct io_pgtable_cfg *cfg = &data->iop.cfg;
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/* Find our entry at the current level */
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ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
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/* If we can install a leaf entry at this level, then do so */
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if (size == block_size && (size & cfg->pgsize_bitmap))
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return arm_lpae_init_pte(data, iova, paddr, prot, lvl, ptep);
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/* We can't allocate tables at the final level */
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if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
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return -EINVAL;
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/* Grab a pointer to the next level */
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pte = *ptep;
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if (!pte) {
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cptep = __arm_lpae_alloc_pages(ARM_LPAE_GRANULE(data),
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GFP_ATOMIC, cfg);
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if (!cptep)
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return -ENOMEM;
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pte = __pa(cptep) | ARM_LPAE_PTE_TYPE_TABLE;
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if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
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pte |= ARM_LPAE_PTE_NSTABLE;
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__arm_lpae_set_pte(ptep, pte, cfg);
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} else {
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cptep = iopte_deref(pte, data);
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}
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/* Rinse, repeat */
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return __arm_lpae_map(data, iova, paddr, size, prot, lvl + 1, cptep);
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}
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static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
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int prot)
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{
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arm_lpae_iopte pte;
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if (data->iop.fmt == ARM_64_LPAE_S1 ||
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data->iop.fmt == ARM_32_LPAE_S1) {
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pte = ARM_LPAE_PTE_AP_UNPRIV | ARM_LPAE_PTE_nG;
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if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
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pte |= ARM_LPAE_PTE_AP_RDONLY;
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if (prot & IOMMU_MMIO)
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pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
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<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
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else if (prot & IOMMU_CACHE)
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pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
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<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
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} else {
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pte = ARM_LPAE_PTE_HAP_FAULT;
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if (prot & IOMMU_READ)
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pte |= ARM_LPAE_PTE_HAP_READ;
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if (prot & IOMMU_WRITE)
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pte |= ARM_LPAE_PTE_HAP_WRITE;
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if (prot & IOMMU_MMIO)
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pte |= ARM_LPAE_PTE_MEMATTR_DEV;
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else if (prot & IOMMU_CACHE)
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pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
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else
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pte |= ARM_LPAE_PTE_MEMATTR_NC;
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}
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if (prot & IOMMU_NOEXEC)
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pte |= ARM_LPAE_PTE_XN;
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return pte;
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}
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static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
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phys_addr_t paddr, size_t size, int iommu_prot)
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{
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struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
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arm_lpae_iopte *ptep = data->pgd;
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int ret, lvl = ARM_LPAE_START_LVL(data);
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arm_lpae_iopte prot;
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/* If no access, then nothing to do */
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if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
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return 0;
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prot = arm_lpae_prot_to_pte(data, iommu_prot);
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ret = __arm_lpae_map(data, iova, paddr, size, prot, lvl, ptep);
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/*
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* Synchronise all PTE updates for the new mapping before there's
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* a chance for anything to kick off a table walk for the new iova.
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*/
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wmb();
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return ret;
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}
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static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
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arm_lpae_iopte *ptep)
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{
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arm_lpae_iopte *start, *end;
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unsigned long table_size;
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if (lvl == ARM_LPAE_START_LVL(data))
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table_size = data->pgd_size;
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else
|
|
table_size = ARM_LPAE_GRANULE(data);
|
|
|
|
start = ptep;
|
|
|
|
/* Only leaf entries at the last level */
|
|
if (lvl == ARM_LPAE_MAX_LEVELS - 1)
|
|
end = ptep;
|
|
else
|
|
end = (void *)ptep + table_size;
|
|
|
|
while (ptep != end) {
|
|
arm_lpae_iopte pte = *ptep++;
|
|
|
|
if (!pte || iopte_leaf(pte, lvl))
|
|
continue;
|
|
|
|
__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
|
|
}
|
|
|
|
__arm_lpae_free_pages(start, table_size, &data->iop.cfg);
|
|
}
|
|
|
|
static void arm_lpae_free_pgtable(struct io_pgtable *iop)
|
|
{
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop);
|
|
|
|
__arm_lpae_free_pgtable(data, ARM_LPAE_START_LVL(data), data->pgd);
|
|
kfree(data);
|
|
}
|
|
|
|
static int arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
|
|
unsigned long iova, size_t size,
|
|
arm_lpae_iopte prot, int lvl,
|
|
arm_lpae_iopte *ptep, size_t blk_size)
|
|
{
|
|
unsigned long blk_start, blk_end;
|
|
phys_addr_t blk_paddr;
|
|
arm_lpae_iopte table = 0;
|
|
|
|
blk_start = iova & ~(blk_size - 1);
|
|
blk_end = blk_start + blk_size;
|
|
blk_paddr = iopte_to_pfn(*ptep, data) << data->pg_shift;
|
|
|
|
for (; blk_start < blk_end; blk_start += size, blk_paddr += size) {
|
|
arm_lpae_iopte *tablep;
|
|
|
|
/* Unmap! */
|
|
if (blk_start == iova)
|
|
continue;
|
|
|
|
/* __arm_lpae_map expects a pointer to the start of the table */
|
|
tablep = &table - ARM_LPAE_LVL_IDX(blk_start, lvl, data);
|
|
if (__arm_lpae_map(data, blk_start, blk_paddr, size, prot, lvl,
|
|
tablep) < 0) {
|
|
if (table) {
|
|
/* Free the table we allocated */
|
|
tablep = iopte_deref(table, data);
|
|
__arm_lpae_free_pgtable(data, lvl + 1, tablep);
|
|
}
|
|
return 0; /* Bytes unmapped */
|
|
}
|
|
}
|
|
|
|
__arm_lpae_set_pte(ptep, table, &data->iop.cfg);
|
|
iova &= ~(blk_size - 1);
|
|
io_pgtable_tlb_add_flush(&data->iop, iova, blk_size, blk_size, true);
|
|
return size;
|
|
}
|
|
|
|
static int __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
|
|
unsigned long iova, size_t size, int lvl,
|
|
arm_lpae_iopte *ptep)
|
|
{
|
|
arm_lpae_iopte pte;
|
|
struct io_pgtable *iop = &data->iop;
|
|
size_t blk_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
|
|
|
|
/* Something went horribly wrong and we ran out of page table */
|
|
if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
|
|
return 0;
|
|
|
|
ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
|
|
pte = *ptep;
|
|
if (WARN_ON(!pte))
|
|
return 0;
|
|
|
|
/* If the size matches this level, we're in the right place */
|
|
if (size == blk_size) {
|
|
__arm_lpae_set_pte(ptep, 0, &iop->cfg);
|
|
|
|
if (!iopte_leaf(pte, lvl)) {
|
|
/* Also flush any partial walks */
|
|
io_pgtable_tlb_add_flush(iop, iova, size,
|
|
ARM_LPAE_GRANULE(data), false);
|
|
io_pgtable_tlb_sync(iop);
|
|
ptep = iopte_deref(pte, data);
|
|
__arm_lpae_free_pgtable(data, lvl + 1, ptep);
|
|
} else {
|
|
io_pgtable_tlb_add_flush(iop, iova, size, size, true);
|
|
}
|
|
|
|
return size;
|
|
} else if (iopte_leaf(pte, lvl)) {
|
|
/*
|
|
* Insert a table at the next level to map the old region,
|
|
* minus the part we want to unmap
|
|
*/
|
|
return arm_lpae_split_blk_unmap(data, iova, size,
|
|
iopte_prot(pte), lvl, ptep,
|
|
blk_size);
|
|
}
|
|
|
|
/* Keep on walkin' */
|
|
ptep = iopte_deref(pte, data);
|
|
return __arm_lpae_unmap(data, iova, size, lvl + 1, ptep);
|
|
}
|
|
|
|
static int arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
|
|
size_t size)
|
|
{
|
|
size_t unmapped;
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
arm_lpae_iopte *ptep = data->pgd;
|
|
int lvl = ARM_LPAE_START_LVL(data);
|
|
|
|
unmapped = __arm_lpae_unmap(data, iova, size, lvl, ptep);
|
|
if (unmapped)
|
|
io_pgtable_tlb_sync(&data->iop);
|
|
|
|
return unmapped;
|
|
}
|
|
|
|
static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
|
|
unsigned long iova)
|
|
{
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
arm_lpae_iopte pte, *ptep = data->pgd;
|
|
int lvl = ARM_LPAE_START_LVL(data);
|
|
|
|
do {
|
|
/* Valid IOPTE pointer? */
|
|
if (!ptep)
|
|
return 0;
|
|
|
|
/* Grab the IOPTE we're interested in */
|
|
pte = *(ptep + ARM_LPAE_LVL_IDX(iova, lvl, data));
|
|
|
|
/* Valid entry? */
|
|
if (!pte)
|
|
return 0;
|
|
|
|
/* Leaf entry? */
|
|
if (iopte_leaf(pte,lvl))
|
|
goto found_translation;
|
|
|
|
/* Take it to the next level */
|
|
ptep = iopte_deref(pte, data);
|
|
} while (++lvl < ARM_LPAE_MAX_LEVELS);
|
|
|
|
/* Ran out of page tables to walk */
|
|
return 0;
|
|
|
|
found_translation:
|
|
iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1);
|
|
return ((phys_addr_t)iopte_to_pfn(pte,data) << data->pg_shift) | iova;
|
|
}
|
|
|
|
static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
|
|
{
|
|
unsigned long granule;
|
|
|
|
/*
|
|
* We need to restrict the supported page sizes to match the
|
|
* translation regime for a particular granule. Aim to match
|
|
* the CPU page size if possible, otherwise prefer smaller sizes.
|
|
* While we're at it, restrict the block sizes to match the
|
|
* chosen granule.
|
|
*/
|
|
if (cfg->pgsize_bitmap & PAGE_SIZE)
|
|
granule = PAGE_SIZE;
|
|
else if (cfg->pgsize_bitmap & ~PAGE_MASK)
|
|
granule = 1UL << __fls(cfg->pgsize_bitmap & ~PAGE_MASK);
|
|
else if (cfg->pgsize_bitmap & PAGE_MASK)
|
|
granule = 1UL << __ffs(cfg->pgsize_bitmap & PAGE_MASK);
|
|
else
|
|
granule = 0;
|
|
|
|
switch (granule) {
|
|
case SZ_4K:
|
|
cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
|
|
break;
|
|
case SZ_16K:
|
|
cfg->pgsize_bitmap &= (SZ_16K | SZ_32M);
|
|
break;
|
|
case SZ_64K:
|
|
cfg->pgsize_bitmap &= (SZ_64K | SZ_512M);
|
|
break;
|
|
default:
|
|
cfg->pgsize_bitmap = 0;
|
|
}
|
|
}
|
|
|
|
static struct arm_lpae_io_pgtable *
|
|
arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
|
|
{
|
|
unsigned long va_bits, pgd_bits;
|
|
struct arm_lpae_io_pgtable *data;
|
|
|
|
arm_lpae_restrict_pgsizes(cfg);
|
|
|
|
if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
|
|
return NULL;
|
|
|
|
if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
|
|
return NULL;
|
|
|
|
if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
|
|
return NULL;
|
|
|
|
if (!selftest_running && cfg->iommu_dev->dma_pfn_offset) {
|
|
dev_err(cfg->iommu_dev, "Cannot accommodate DMA offset for IOMMU page tables\n");
|
|
return NULL;
|
|
}
|
|
|
|
data = kmalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
data->pg_shift = __ffs(cfg->pgsize_bitmap);
|
|
data->bits_per_level = data->pg_shift - ilog2(sizeof(arm_lpae_iopte));
|
|
|
|
va_bits = cfg->ias - data->pg_shift;
|
|
data->levels = DIV_ROUND_UP(va_bits, data->bits_per_level);
|
|
|
|
/* Calculate the actual size of our pgd (without concatenation) */
|
|
pgd_bits = va_bits - (data->bits_per_level * (data->levels - 1));
|
|
data->pgd_size = 1UL << (pgd_bits + ilog2(sizeof(arm_lpae_iopte)));
|
|
|
|
data->iop.ops = (struct io_pgtable_ops) {
|
|
.map = arm_lpae_map,
|
|
.unmap = arm_lpae_unmap,
|
|
.iova_to_phys = arm_lpae_iova_to_phys,
|
|
};
|
|
|
|
return data;
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
u64 reg;
|
|
struct arm_lpae_io_pgtable *data;
|
|
|
|
if (cfg->quirks & ~IO_PGTABLE_QUIRK_ARM_NS)
|
|
return NULL;
|
|
|
|
data = arm_lpae_alloc_pgtable(cfg);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
/* TCR */
|
|
reg = (ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
|
|
(ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
|
|
(ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
|
|
|
|
switch (ARM_LPAE_GRANULE(data)) {
|
|
case SZ_4K:
|
|
reg |= ARM_LPAE_TCR_TG0_4K;
|
|
break;
|
|
case SZ_16K:
|
|
reg |= ARM_LPAE_TCR_TG0_16K;
|
|
break;
|
|
case SZ_64K:
|
|
reg |= ARM_LPAE_TCR_TG0_64K;
|
|
break;
|
|
}
|
|
|
|
switch (cfg->oas) {
|
|
case 32:
|
|
reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_IPS_SHIFT);
|
|
break;
|
|
case 36:
|
|
reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_IPS_SHIFT);
|
|
break;
|
|
case 40:
|
|
reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_IPS_SHIFT);
|
|
break;
|
|
case 42:
|
|
reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_IPS_SHIFT);
|
|
break;
|
|
case 44:
|
|
reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_IPS_SHIFT);
|
|
break;
|
|
case 48:
|
|
reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_IPS_SHIFT);
|
|
break;
|
|
default:
|
|
goto out_free_data;
|
|
}
|
|
|
|
reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT;
|
|
|
|
/* Disable speculative walks through TTBR1 */
|
|
reg |= ARM_LPAE_TCR_EPD1;
|
|
cfg->arm_lpae_s1_cfg.tcr = reg;
|
|
|
|
/* MAIRs */
|
|
reg = (ARM_LPAE_MAIR_ATTR_NC
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
|
|
(ARM_LPAE_MAIR_ATTR_WBRWA
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
|
|
(ARM_LPAE_MAIR_ATTR_DEVICE
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV));
|
|
|
|
cfg->arm_lpae_s1_cfg.mair[0] = reg;
|
|
cfg->arm_lpae_s1_cfg.mair[1] = 0;
|
|
|
|
/* Looking good; allocate a pgd */
|
|
data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
|
|
if (!data->pgd)
|
|
goto out_free_data;
|
|
|
|
/* Ensure the empty pgd is visible before any actual TTBR write */
|
|
wmb();
|
|
|
|
/* TTBRs */
|
|
cfg->arm_lpae_s1_cfg.ttbr[0] = virt_to_phys(data->pgd);
|
|
cfg->arm_lpae_s1_cfg.ttbr[1] = 0;
|
|
return &data->iop;
|
|
|
|
out_free_data:
|
|
kfree(data);
|
|
return NULL;
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
u64 reg, sl;
|
|
struct arm_lpae_io_pgtable *data;
|
|
|
|
/* The NS quirk doesn't apply at stage 2 */
|
|
if (cfg->quirks)
|
|
return NULL;
|
|
|
|
data = arm_lpae_alloc_pgtable(cfg);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
/*
|
|
* Concatenate PGDs at level 1 if possible in order to reduce
|
|
* the depth of the stage-2 walk.
|
|
*/
|
|
if (data->levels == ARM_LPAE_MAX_LEVELS) {
|
|
unsigned long pgd_pages;
|
|
|
|
pgd_pages = data->pgd_size >> ilog2(sizeof(arm_lpae_iopte));
|
|
if (pgd_pages <= ARM_LPAE_S2_MAX_CONCAT_PAGES) {
|
|
data->pgd_size = pgd_pages << data->pg_shift;
|
|
data->levels--;
|
|
}
|
|
}
|
|
|
|
/* VTCR */
|
|
reg = ARM_64_LPAE_S2_TCR_RES1 |
|
|
(ARM_LPAE_TCR_SH_IS << ARM_LPAE_TCR_SH0_SHIFT) |
|
|
(ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_IRGN0_SHIFT) |
|
|
(ARM_LPAE_TCR_RGN_WBWA << ARM_LPAE_TCR_ORGN0_SHIFT);
|
|
|
|
sl = ARM_LPAE_START_LVL(data);
|
|
|
|
switch (ARM_LPAE_GRANULE(data)) {
|
|
case SZ_4K:
|
|
reg |= ARM_LPAE_TCR_TG0_4K;
|
|
sl++; /* SL0 format is different for 4K granule size */
|
|
break;
|
|
case SZ_16K:
|
|
reg |= ARM_LPAE_TCR_TG0_16K;
|
|
break;
|
|
case SZ_64K:
|
|
reg |= ARM_LPAE_TCR_TG0_64K;
|
|
break;
|
|
}
|
|
|
|
switch (cfg->oas) {
|
|
case 32:
|
|
reg |= (ARM_LPAE_TCR_PS_32_BIT << ARM_LPAE_TCR_PS_SHIFT);
|
|
break;
|
|
case 36:
|
|
reg |= (ARM_LPAE_TCR_PS_36_BIT << ARM_LPAE_TCR_PS_SHIFT);
|
|
break;
|
|
case 40:
|
|
reg |= (ARM_LPAE_TCR_PS_40_BIT << ARM_LPAE_TCR_PS_SHIFT);
|
|
break;
|
|
case 42:
|
|
reg |= (ARM_LPAE_TCR_PS_42_BIT << ARM_LPAE_TCR_PS_SHIFT);
|
|
break;
|
|
case 44:
|
|
reg |= (ARM_LPAE_TCR_PS_44_BIT << ARM_LPAE_TCR_PS_SHIFT);
|
|
break;
|
|
case 48:
|
|
reg |= (ARM_LPAE_TCR_PS_48_BIT << ARM_LPAE_TCR_PS_SHIFT);
|
|
break;
|
|
default:
|
|
goto out_free_data;
|
|
}
|
|
|
|
reg |= (64ULL - cfg->ias) << ARM_LPAE_TCR_T0SZ_SHIFT;
|
|
reg |= (~sl & ARM_LPAE_TCR_SL0_MASK) << ARM_LPAE_TCR_SL0_SHIFT;
|
|
cfg->arm_lpae_s2_cfg.vtcr = reg;
|
|
|
|
/* Allocate pgd pages */
|
|
data->pgd = __arm_lpae_alloc_pages(data->pgd_size, GFP_KERNEL, cfg);
|
|
if (!data->pgd)
|
|
goto out_free_data;
|
|
|
|
/* Ensure the empty pgd is visible before any actual TTBR write */
|
|
wmb();
|
|
|
|
/* VTTBR */
|
|
cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
|
|
return &data->iop;
|
|
|
|
out_free_data:
|
|
kfree(data);
|
|
return NULL;
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
struct io_pgtable *iop;
|
|
|
|
if (cfg->ias > 32 || cfg->oas > 40)
|
|
return NULL;
|
|
|
|
cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
|
|
iop = arm_64_lpae_alloc_pgtable_s1(cfg, cookie);
|
|
if (iop) {
|
|
cfg->arm_lpae_s1_cfg.tcr |= ARM_32_LPAE_TCR_EAE;
|
|
cfg->arm_lpae_s1_cfg.tcr &= 0xffffffff;
|
|
}
|
|
|
|
return iop;
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
struct io_pgtable *iop;
|
|
|
|
if (cfg->ias > 40 || cfg->oas > 40)
|
|
return NULL;
|
|
|
|
cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
|
|
iop = arm_64_lpae_alloc_pgtable_s2(cfg, cookie);
|
|
if (iop)
|
|
cfg->arm_lpae_s2_cfg.vtcr &= 0xffffffff;
|
|
|
|
return iop;
|
|
}
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = {
|
|
.alloc = arm_64_lpae_alloc_pgtable_s1,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns = {
|
|
.alloc = arm_64_lpae_alloc_pgtable_s2,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns = {
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.alloc = arm_32_lpae_alloc_pgtable_s1,
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|
.free = arm_lpae_free_pgtable,
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|
};
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = {
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|
.alloc = arm_32_lpae_alloc_pgtable_s2,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_SELFTEST
|
|
|
|
static struct io_pgtable_cfg *cfg_cookie;
|
|
|
|
static void dummy_tlb_flush_all(void *cookie)
|
|
{
|
|
WARN_ON(cookie != cfg_cookie);
|
|
}
|
|
|
|
static void dummy_tlb_add_flush(unsigned long iova, size_t size,
|
|
size_t granule, bool leaf, void *cookie)
|
|
{
|
|
WARN_ON(cookie != cfg_cookie);
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|
WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
|
|
}
|
|
|
|
static void dummy_tlb_sync(void *cookie)
|
|
{
|
|
WARN_ON(cookie != cfg_cookie);
|
|
}
|
|
|
|
static const struct iommu_gather_ops dummy_tlb_ops __initconst = {
|
|
.tlb_flush_all = dummy_tlb_flush_all,
|
|
.tlb_add_flush = dummy_tlb_add_flush,
|
|
.tlb_sync = dummy_tlb_sync,
|
|
};
|
|
|
|
static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
|
|
{
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
|
|
|
pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n",
|
|
cfg->pgsize_bitmap, cfg->ias);
|
|
pr_err("data: %d levels, 0x%zx pgd_size, %lu pg_shift, %lu bits_per_level, pgd @ %p\n",
|
|
data->levels, data->pgd_size, data->pg_shift,
|
|
data->bits_per_level, data->pgd);
|
|
}
|
|
|
|
#define __FAIL(ops, i) ({ \
|
|
WARN(1, "selftest: test failed for fmt idx %d\n", (i)); \
|
|
arm_lpae_dump_ops(ops); \
|
|
selftest_running = false; \
|
|
-EFAULT; \
|
|
})
|
|
|
|
static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
|
|
{
|
|
static const enum io_pgtable_fmt fmts[] = {
|
|
ARM_64_LPAE_S1,
|
|
ARM_64_LPAE_S2,
|
|
};
|
|
|
|
int i, j;
|
|
unsigned long iova;
|
|
size_t size;
|
|
struct io_pgtable_ops *ops;
|
|
|
|
selftest_running = true;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
|
|
cfg_cookie = cfg;
|
|
ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
|
|
if (!ops) {
|
|
pr_err("selftest: failed to allocate io pgtable ops\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Initial sanity checks.
|
|
* Empty page tables shouldn't provide any translations.
|
|
*/
|
|
if (ops->iova_to_phys(ops, 42))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, SZ_1G + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, SZ_2G + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
/*
|
|
* Distinct mappings of different granule sizes.
|
|
*/
|
|
iova = 0;
|
|
for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
|
|
size = 1UL << j;
|
|
|
|
if (ops->map(ops, iova, iova, size, IOMMU_READ |
|
|
IOMMU_WRITE |
|
|
IOMMU_NOEXEC |
|
|
IOMMU_CACHE))
|
|
return __FAIL(ops, i);
|
|
|
|
/* Overlapping mappings */
|
|
if (!ops->map(ops, iova, iova + size, size,
|
|
IOMMU_READ | IOMMU_NOEXEC))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
iova += SZ_1G;
|
|
}
|
|
|
|
/* Partial unmap */
|
|
size = 1UL << __ffs(cfg->pgsize_bitmap);
|
|
if (ops->unmap(ops, SZ_1G + size, size) != size)
|
|
return __FAIL(ops, i);
|
|
|
|
/* Remap of partial unmap */
|
|
if (ops->map(ops, SZ_1G + size, size, size, IOMMU_READ))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, SZ_1G + size + 42) != (size + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
/* Full unmap */
|
|
iova = 0;
|
|
j = find_first_bit(&cfg->pgsize_bitmap, BITS_PER_LONG);
|
|
while (j != BITS_PER_LONG) {
|
|
size = 1UL << j;
|
|
|
|
if (ops->unmap(ops, iova, size) != size)
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
/* Remap full block */
|
|
if (ops->map(ops, iova, iova, size, IOMMU_WRITE))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
iova += SZ_1G;
|
|
j++;
|
|
j = find_next_bit(&cfg->pgsize_bitmap, BITS_PER_LONG, j);
|
|
}
|
|
|
|
free_io_pgtable_ops(ops);
|
|
}
|
|
|
|
selftest_running = false;
|
|
return 0;
|
|
}
|
|
|
|
static int __init arm_lpae_do_selftests(void)
|
|
{
|
|
static const unsigned long pgsize[] = {
|
|
SZ_4K | SZ_2M | SZ_1G,
|
|
SZ_16K | SZ_32M,
|
|
SZ_64K | SZ_512M,
|
|
};
|
|
|
|
static const unsigned int ias[] = {
|
|
32, 36, 40, 42, 44, 48,
|
|
};
|
|
|
|
int i, j, pass = 0, fail = 0;
|
|
struct io_pgtable_cfg cfg = {
|
|
.tlb = &dummy_tlb_ops,
|
|
.oas = 48,
|
|
};
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
|
|
for (j = 0; j < ARRAY_SIZE(ias); ++j) {
|
|
cfg.pgsize_bitmap = pgsize[i];
|
|
cfg.ias = ias[j];
|
|
pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n",
|
|
pgsize[i], ias[j]);
|
|
if (arm_lpae_run_tests(&cfg))
|
|
fail++;
|
|
else
|
|
pass++;
|
|
}
|
|
}
|
|
|
|
pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail);
|
|
return fail ? -EFAULT : 0;
|
|
}
|
|
subsys_initcall(arm_lpae_do_selftests);
|
|
#endif
|