988 строки
27 KiB
C
988 строки
27 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* CPU-agnostic ARM page table allocator.
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*
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* ARMv7 Short-descriptor format, supporting
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* - Basic memory attributes
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* - Simplified access permissions (AP[2:1] model)
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* - Backwards-compatible TEX remap
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* - Large pages/supersections (if indicated by the caller)
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*
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* Not supporting:
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* - Legacy access permissions (AP[2:0] model)
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*
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* Almost certainly never supporting:
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* - PXN
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* - Domains
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*
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* Copyright (C) 2014-2015 ARM Limited
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* Copyright (c) 2014-2015 MediaTek Inc.
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*/
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#define pr_fmt(fmt) "arm-v7s io-pgtable: " fmt
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#include <linux/atomic.h>
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#include <linux/dma-mapping.h>
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#include <linux/gfp.h>
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#include <linux/io-pgtable.h>
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#include <linux/iommu.h>
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#include <linux/kernel.h>
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#include <linux/kmemleak.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <asm/barrier.h>
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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_v7s_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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* We have 32 bits total; 12 bits resolved at level 1, 8 bits at level 2,
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* and 12 bits in a page. With some carefully-chosen coefficients we can
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* hide the ugly inconsistencies behind these macros and at least let the
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* rest of the code pretend to be somewhat sane.
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*/
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#define ARM_V7S_ADDR_BITS 32
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#define _ARM_V7S_LVL_BITS(lvl) (16 - (lvl) * 4)
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#define ARM_V7S_LVL_SHIFT(lvl) (ARM_V7S_ADDR_BITS - (4 + 8 * (lvl)))
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#define ARM_V7S_TABLE_SHIFT 10
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#define ARM_V7S_PTES_PER_LVL(lvl) (1 << _ARM_V7S_LVL_BITS(lvl))
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#define ARM_V7S_TABLE_SIZE(lvl) \
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(ARM_V7S_PTES_PER_LVL(lvl) * sizeof(arm_v7s_iopte))
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#define ARM_V7S_BLOCK_SIZE(lvl) (1UL << ARM_V7S_LVL_SHIFT(lvl))
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#define ARM_V7S_LVL_MASK(lvl) ((u32)(~0U << ARM_V7S_LVL_SHIFT(lvl)))
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#define ARM_V7S_TABLE_MASK ((u32)(~0U << ARM_V7S_TABLE_SHIFT))
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#define _ARM_V7S_IDX_MASK(lvl) (ARM_V7S_PTES_PER_LVL(lvl) - 1)
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#define ARM_V7S_LVL_IDX(addr, lvl) ({ \
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int _l = lvl; \
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((u32)(addr) >> ARM_V7S_LVL_SHIFT(_l)) & _ARM_V7S_IDX_MASK(_l); \
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})
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/*
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* Large page/supersection entries are effectively a block of 16 page/section
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* entries, along the lines of the LPAE contiguous hint, but all with the
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* same output address. For want of a better common name we'll call them
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* "contiguous" versions of their respective page/section entries here, but
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* noting the distinction (WRT to TLB maintenance) that they represent *one*
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* entry repeated 16 times, not 16 separate entries (as in the LPAE case).
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*/
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#define ARM_V7S_CONT_PAGES 16
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/* PTE type bits: these are all mixed up with XN/PXN bits in most cases */
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#define ARM_V7S_PTE_TYPE_TABLE 0x1
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#define ARM_V7S_PTE_TYPE_PAGE 0x2
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#define ARM_V7S_PTE_TYPE_CONT_PAGE 0x1
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#define ARM_V7S_PTE_IS_VALID(pte) (((pte) & 0x3) != 0)
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#define ARM_V7S_PTE_IS_TABLE(pte, lvl) \
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((lvl) == 1 && (((pte) & 0x3) == ARM_V7S_PTE_TYPE_TABLE))
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/* Page table bits */
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#define ARM_V7S_ATTR_XN(lvl) BIT(4 * (2 - (lvl)))
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#define ARM_V7S_ATTR_B BIT(2)
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#define ARM_V7S_ATTR_C BIT(3)
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#define ARM_V7S_ATTR_NS_TABLE BIT(3)
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#define ARM_V7S_ATTR_NS_SECTION BIT(19)
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#define ARM_V7S_CONT_SECTION BIT(18)
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#define ARM_V7S_CONT_PAGE_XN_SHIFT 15
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/*
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* The attribute bits are consistently ordered*, but occupy bits [17:10] of
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* a level 1 PTE vs. bits [11:4] at level 2. Thus we define the individual
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* fields relative to that 8-bit block, plus a total shift relative to the PTE.
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*/
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#define ARM_V7S_ATTR_SHIFT(lvl) (16 - (lvl) * 6)
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#define ARM_V7S_ATTR_MASK 0xff
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#define ARM_V7S_ATTR_AP0 BIT(0)
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#define ARM_V7S_ATTR_AP1 BIT(1)
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#define ARM_V7S_ATTR_AP2 BIT(5)
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#define ARM_V7S_ATTR_S BIT(6)
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#define ARM_V7S_ATTR_NG BIT(7)
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#define ARM_V7S_TEX_SHIFT 2
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#define ARM_V7S_TEX_MASK 0x7
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#define ARM_V7S_ATTR_TEX(val) (((val) & ARM_V7S_TEX_MASK) << ARM_V7S_TEX_SHIFT)
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/* MediaTek extend the two bits for PA 32bit/33bit */
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#define ARM_V7S_ATTR_MTK_PA_BIT32 BIT(9)
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#define ARM_V7S_ATTR_MTK_PA_BIT33 BIT(4)
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/* *well, except for TEX on level 2 large pages, of course :( */
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#define ARM_V7S_CONT_PAGE_TEX_SHIFT 6
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#define ARM_V7S_CONT_PAGE_TEX_MASK (ARM_V7S_TEX_MASK << ARM_V7S_CONT_PAGE_TEX_SHIFT)
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/* Simplified access permissions */
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#define ARM_V7S_PTE_AF ARM_V7S_ATTR_AP0
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#define ARM_V7S_PTE_AP_UNPRIV ARM_V7S_ATTR_AP1
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#define ARM_V7S_PTE_AP_RDONLY ARM_V7S_ATTR_AP2
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/* Register bits */
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#define ARM_V7S_RGN_NC 0
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#define ARM_V7S_RGN_WBWA 1
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#define ARM_V7S_RGN_WT 2
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#define ARM_V7S_RGN_WB 3
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#define ARM_V7S_PRRR_TYPE_DEVICE 1
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#define ARM_V7S_PRRR_TYPE_NORMAL 2
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#define ARM_V7S_PRRR_TR(n, type) (((type) & 0x3) << ((n) * 2))
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#define ARM_V7S_PRRR_DS0 BIT(16)
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#define ARM_V7S_PRRR_DS1 BIT(17)
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#define ARM_V7S_PRRR_NS0 BIT(18)
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#define ARM_V7S_PRRR_NS1 BIT(19)
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#define ARM_V7S_PRRR_NOS(n) BIT((n) + 24)
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#define ARM_V7S_NMRR_IR(n, attr) (((attr) & 0x3) << ((n) * 2))
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#define ARM_V7S_NMRR_OR(n, attr) (((attr) & 0x3) << ((n) * 2 + 16))
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#define ARM_V7S_TTBR_S BIT(1)
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#define ARM_V7S_TTBR_NOS BIT(5)
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#define ARM_V7S_TTBR_ORGN_ATTR(attr) (((attr) & 0x3) << 3)
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#define ARM_V7S_TTBR_IRGN_ATTR(attr) \
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((((attr) & 0x1) << 6) | (((attr) & 0x2) >> 1))
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#ifdef CONFIG_ZONE_DMA32
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#define ARM_V7S_TABLE_GFP_DMA GFP_DMA32
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#define ARM_V7S_TABLE_SLAB_FLAGS SLAB_CACHE_DMA32
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#else
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#define ARM_V7S_TABLE_GFP_DMA GFP_DMA
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#define ARM_V7S_TABLE_SLAB_FLAGS SLAB_CACHE_DMA
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#endif
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typedef u32 arm_v7s_iopte;
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static bool selftest_running;
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struct arm_v7s_io_pgtable {
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struct io_pgtable iop;
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arm_v7s_iopte *pgd;
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struct kmem_cache *l2_tables;
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spinlock_t split_lock;
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};
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static bool arm_v7s_pte_is_cont(arm_v7s_iopte pte, int lvl);
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static dma_addr_t __arm_v7s_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 bool arm_v7s_is_mtk_enabled(struct io_pgtable_cfg *cfg)
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{
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return IS_ENABLED(CONFIG_PHYS_ADDR_T_64BIT) &&
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(cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT);
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}
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static arm_v7s_iopte paddr_to_iopte(phys_addr_t paddr, int lvl,
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struct io_pgtable_cfg *cfg)
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{
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arm_v7s_iopte pte = paddr & ARM_V7S_LVL_MASK(lvl);
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if (!arm_v7s_is_mtk_enabled(cfg))
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return pte;
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if (paddr & BIT_ULL(32))
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pte |= ARM_V7S_ATTR_MTK_PA_BIT32;
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if (paddr & BIT_ULL(33))
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pte |= ARM_V7S_ATTR_MTK_PA_BIT33;
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return pte;
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}
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static phys_addr_t iopte_to_paddr(arm_v7s_iopte pte, int lvl,
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struct io_pgtable_cfg *cfg)
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{
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arm_v7s_iopte mask;
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phys_addr_t paddr;
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if (ARM_V7S_PTE_IS_TABLE(pte, lvl))
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mask = ARM_V7S_TABLE_MASK;
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else if (arm_v7s_pte_is_cont(pte, lvl))
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mask = ARM_V7S_LVL_MASK(lvl) * ARM_V7S_CONT_PAGES;
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else
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mask = ARM_V7S_LVL_MASK(lvl);
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paddr = pte & mask;
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if (!arm_v7s_is_mtk_enabled(cfg))
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return paddr;
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if (pte & ARM_V7S_ATTR_MTK_PA_BIT32)
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paddr |= BIT_ULL(32);
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if (pte & ARM_V7S_ATTR_MTK_PA_BIT33)
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paddr |= BIT_ULL(33);
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return paddr;
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}
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static arm_v7s_iopte *iopte_deref(arm_v7s_iopte pte, int lvl,
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struct arm_v7s_io_pgtable *data)
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{
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return phys_to_virt(iopte_to_paddr(pte, lvl, &data->iop.cfg));
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}
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static void *__arm_v7s_alloc_table(int lvl, gfp_t gfp,
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struct arm_v7s_io_pgtable *data)
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{
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struct io_pgtable_cfg *cfg = &data->iop.cfg;
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struct device *dev = cfg->iommu_dev;
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phys_addr_t phys;
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dma_addr_t dma;
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size_t size = ARM_V7S_TABLE_SIZE(lvl);
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void *table = NULL;
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if (lvl == 1)
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table = (void *)__get_free_pages(
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__GFP_ZERO | ARM_V7S_TABLE_GFP_DMA, get_order(size));
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else if (lvl == 2)
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table = kmem_cache_zalloc(data->l2_tables, gfp);
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phys = virt_to_phys(table);
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if (phys != (arm_v7s_iopte)phys) {
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/* Doesn't fit in PTE */
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dev_err(dev, "Page table does not fit in PTE: %pa", &phys);
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goto out_free;
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}
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if (table && !cfg->coherent_walk) {
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dma = dma_map_single(dev, table, 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 != phys)
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goto out_unmap;
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}
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if (lvl == 2)
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kmemleak_ignore(table);
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return table;
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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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if (lvl == 1)
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free_pages((unsigned long)table, get_order(size));
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else
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kmem_cache_free(data->l2_tables, table);
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return NULL;
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}
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static void __arm_v7s_free_table(void *table, int lvl,
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struct arm_v7s_io_pgtable *data)
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{
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struct io_pgtable_cfg *cfg = &data->iop.cfg;
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struct device *dev = cfg->iommu_dev;
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size_t size = ARM_V7S_TABLE_SIZE(lvl);
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if (!cfg->coherent_walk)
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dma_unmap_single(dev, __arm_v7s_dma_addr(table), size,
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DMA_TO_DEVICE);
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if (lvl == 1)
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free_pages((unsigned long)table, get_order(size));
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else
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kmem_cache_free(data->l2_tables, table);
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}
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static void __arm_v7s_pte_sync(arm_v7s_iopte *ptep, int num_entries,
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struct io_pgtable_cfg *cfg)
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{
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if (cfg->coherent_walk)
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return;
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dma_sync_single_for_device(cfg->iommu_dev, __arm_v7s_dma_addr(ptep),
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num_entries * sizeof(*ptep), DMA_TO_DEVICE);
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}
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static void __arm_v7s_set_pte(arm_v7s_iopte *ptep, arm_v7s_iopte pte,
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int num_entries, struct io_pgtable_cfg *cfg)
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{
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int i;
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for (i = 0; i < num_entries; i++)
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ptep[i] = pte;
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__arm_v7s_pte_sync(ptep, num_entries, cfg);
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}
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static arm_v7s_iopte arm_v7s_prot_to_pte(int prot, int lvl,
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struct io_pgtable_cfg *cfg)
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{
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bool ap = !(cfg->quirks & IO_PGTABLE_QUIRK_NO_PERMS);
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arm_v7s_iopte pte = ARM_V7S_ATTR_NG | ARM_V7S_ATTR_S;
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if (!(prot & IOMMU_MMIO))
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pte |= ARM_V7S_ATTR_TEX(1);
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if (ap) {
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pte |= ARM_V7S_PTE_AF;
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if (!(prot & IOMMU_PRIV))
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pte |= ARM_V7S_PTE_AP_UNPRIV;
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if (!(prot & IOMMU_WRITE))
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pte |= ARM_V7S_PTE_AP_RDONLY;
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}
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pte <<= ARM_V7S_ATTR_SHIFT(lvl);
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if ((prot & IOMMU_NOEXEC) && ap)
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pte |= ARM_V7S_ATTR_XN(lvl);
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if (prot & IOMMU_MMIO)
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pte |= ARM_V7S_ATTR_B;
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else if (prot & IOMMU_CACHE)
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pte |= ARM_V7S_ATTR_B | ARM_V7S_ATTR_C;
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pte |= ARM_V7S_PTE_TYPE_PAGE;
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if (lvl == 1 && (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS))
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pte |= ARM_V7S_ATTR_NS_SECTION;
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return pte;
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}
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static int arm_v7s_pte_to_prot(arm_v7s_iopte pte, int lvl)
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{
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int prot = IOMMU_READ;
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arm_v7s_iopte attr = pte >> ARM_V7S_ATTR_SHIFT(lvl);
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if (!(attr & ARM_V7S_PTE_AP_RDONLY))
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prot |= IOMMU_WRITE;
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if (!(attr & ARM_V7S_PTE_AP_UNPRIV))
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prot |= IOMMU_PRIV;
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if ((attr & (ARM_V7S_TEX_MASK << ARM_V7S_TEX_SHIFT)) == 0)
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prot |= IOMMU_MMIO;
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else if (pte & ARM_V7S_ATTR_C)
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prot |= IOMMU_CACHE;
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if (pte & ARM_V7S_ATTR_XN(lvl))
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prot |= IOMMU_NOEXEC;
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return prot;
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}
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static arm_v7s_iopte arm_v7s_pte_to_cont(arm_v7s_iopte pte, int lvl)
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{
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if (lvl == 1) {
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pte |= ARM_V7S_CONT_SECTION;
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} else if (lvl == 2) {
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arm_v7s_iopte xn = pte & ARM_V7S_ATTR_XN(lvl);
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arm_v7s_iopte tex = pte & ARM_V7S_CONT_PAGE_TEX_MASK;
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pte ^= xn | tex | ARM_V7S_PTE_TYPE_PAGE;
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pte |= (xn << ARM_V7S_CONT_PAGE_XN_SHIFT) |
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(tex << ARM_V7S_CONT_PAGE_TEX_SHIFT) |
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ARM_V7S_PTE_TYPE_CONT_PAGE;
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}
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return pte;
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}
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static arm_v7s_iopte arm_v7s_cont_to_pte(arm_v7s_iopte pte, int lvl)
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{
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if (lvl == 1) {
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pte &= ~ARM_V7S_CONT_SECTION;
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} else if (lvl == 2) {
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arm_v7s_iopte xn = pte & BIT(ARM_V7S_CONT_PAGE_XN_SHIFT);
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arm_v7s_iopte tex = pte & (ARM_V7S_CONT_PAGE_TEX_MASK <<
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ARM_V7S_CONT_PAGE_TEX_SHIFT);
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pte ^= xn | tex | ARM_V7S_PTE_TYPE_CONT_PAGE;
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pte |= (xn >> ARM_V7S_CONT_PAGE_XN_SHIFT) |
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(tex >> ARM_V7S_CONT_PAGE_TEX_SHIFT) |
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ARM_V7S_PTE_TYPE_PAGE;
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}
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return pte;
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}
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static bool arm_v7s_pte_is_cont(arm_v7s_iopte pte, int lvl)
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{
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if (lvl == 1 && !ARM_V7S_PTE_IS_TABLE(pte, lvl))
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return pte & ARM_V7S_CONT_SECTION;
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else if (lvl == 2)
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return !(pte & ARM_V7S_PTE_TYPE_PAGE);
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return false;
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}
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static size_t __arm_v7s_unmap(struct arm_v7s_io_pgtable *,
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struct iommu_iotlb_gather *, unsigned long,
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size_t, int, arm_v7s_iopte *);
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static int arm_v7s_init_pte(struct arm_v7s_io_pgtable *data,
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unsigned long iova, phys_addr_t paddr, int prot,
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int lvl, int num_entries, arm_v7s_iopte *ptep)
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{
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struct io_pgtable_cfg *cfg = &data->iop.cfg;
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arm_v7s_iopte pte;
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int i;
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for (i = 0; i < num_entries; i++)
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|
if (ARM_V7S_PTE_IS_TABLE(ptep[i], lvl)) {
|
|
/*
|
|
* We need to unmap and free the old table before
|
|
* overwriting it with a block entry.
|
|
*/
|
|
arm_v7s_iopte *tblp;
|
|
size_t sz = ARM_V7S_BLOCK_SIZE(lvl);
|
|
|
|
tblp = ptep - ARM_V7S_LVL_IDX(iova, lvl);
|
|
if (WARN_ON(__arm_v7s_unmap(data, NULL, iova + i * sz,
|
|
sz, lvl, tblp) != sz))
|
|
return -EINVAL;
|
|
} else if (ptep[i]) {
|
|
/* We require an unmap first */
|
|
WARN_ON(!selftest_running);
|
|
return -EEXIST;
|
|
}
|
|
|
|
pte = arm_v7s_prot_to_pte(prot, lvl, cfg);
|
|
if (num_entries > 1)
|
|
pte = arm_v7s_pte_to_cont(pte, lvl);
|
|
|
|
pte |= paddr_to_iopte(paddr, lvl, cfg);
|
|
|
|
__arm_v7s_set_pte(ptep, pte, num_entries, cfg);
|
|
return 0;
|
|
}
|
|
|
|
static arm_v7s_iopte arm_v7s_install_table(arm_v7s_iopte *table,
|
|
arm_v7s_iopte *ptep,
|
|
arm_v7s_iopte curr,
|
|
struct io_pgtable_cfg *cfg)
|
|
{
|
|
arm_v7s_iopte old, new;
|
|
|
|
new = virt_to_phys(table) | ARM_V7S_PTE_TYPE_TABLE;
|
|
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
|
|
new |= ARM_V7S_ATTR_NS_TABLE;
|
|
|
|
/*
|
|
* Ensure the table itself is visible before its PTE can be.
|
|
* Whilst we could get away with cmpxchg64_release below, this
|
|
* doesn't have any ordering semantics when !CONFIG_SMP.
|
|
*/
|
|
dma_wmb();
|
|
|
|
old = cmpxchg_relaxed(ptep, curr, new);
|
|
__arm_v7s_pte_sync(ptep, 1, cfg);
|
|
|
|
return old;
|
|
}
|
|
|
|
static int __arm_v7s_map(struct arm_v7s_io_pgtable *data, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot,
|
|
int lvl, arm_v7s_iopte *ptep)
|
|
{
|
|
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
|
arm_v7s_iopte pte, *cptep;
|
|
int num_entries = size >> ARM_V7S_LVL_SHIFT(lvl);
|
|
|
|
/* Find our entry at the current level */
|
|
ptep += ARM_V7S_LVL_IDX(iova, lvl);
|
|
|
|
/* If we can install a leaf entry at this level, then do so */
|
|
if (num_entries)
|
|
return arm_v7s_init_pte(data, iova, paddr, prot,
|
|
lvl, num_entries, ptep);
|
|
|
|
/* We can't allocate tables at the final level */
|
|
if (WARN_ON(lvl == 2))
|
|
return -EINVAL;
|
|
|
|
/* Grab a pointer to the next level */
|
|
pte = READ_ONCE(*ptep);
|
|
if (!pte) {
|
|
cptep = __arm_v7s_alloc_table(lvl + 1, GFP_ATOMIC, data);
|
|
if (!cptep)
|
|
return -ENOMEM;
|
|
|
|
pte = arm_v7s_install_table(cptep, ptep, 0, cfg);
|
|
if (pte)
|
|
__arm_v7s_free_table(cptep, lvl + 1, data);
|
|
} else {
|
|
/* We've no easy way of knowing if it's synced yet, so... */
|
|
__arm_v7s_pte_sync(ptep, 1, cfg);
|
|
}
|
|
|
|
if (ARM_V7S_PTE_IS_TABLE(pte, lvl)) {
|
|
cptep = iopte_deref(pte, lvl, data);
|
|
} else if (pte) {
|
|
/* We require an unmap first */
|
|
WARN_ON(!selftest_running);
|
|
return -EEXIST;
|
|
}
|
|
|
|
/* Rinse, repeat */
|
|
return __arm_v7s_map(data, iova, paddr, size, prot, lvl + 1, cptep);
|
|
}
|
|
|
|
static int arm_v7s_map(struct io_pgtable_ops *ops, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int prot)
|
|
{
|
|
struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
struct io_pgtable *iop = &data->iop;
|
|
int ret;
|
|
|
|
/* If no access, then nothing to do */
|
|
if (!(prot & (IOMMU_READ | IOMMU_WRITE)))
|
|
return 0;
|
|
|
|
if (WARN_ON(iova >= (1ULL << data->iop.cfg.ias) ||
|
|
paddr >= (1ULL << data->iop.cfg.oas)))
|
|
return -ERANGE;
|
|
|
|
ret = __arm_v7s_map(data, iova, paddr, size, prot, 1, data->pgd);
|
|
/*
|
|
* Synchronise all PTE updates for the new mapping before there's
|
|
* a chance for anything to kick off a table walk for the new iova.
|
|
*/
|
|
if (iop->cfg.quirks & IO_PGTABLE_QUIRK_TLBI_ON_MAP) {
|
|
io_pgtable_tlb_flush_walk(iop, iova, size,
|
|
ARM_V7S_BLOCK_SIZE(2));
|
|
} else {
|
|
wmb();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void arm_v7s_free_pgtable(struct io_pgtable *iop)
|
|
{
|
|
struct arm_v7s_io_pgtable *data = io_pgtable_to_data(iop);
|
|
int i;
|
|
|
|
for (i = 0; i < ARM_V7S_PTES_PER_LVL(1); i++) {
|
|
arm_v7s_iopte pte = data->pgd[i];
|
|
|
|
if (ARM_V7S_PTE_IS_TABLE(pte, 1))
|
|
__arm_v7s_free_table(iopte_deref(pte, 1, data),
|
|
2, data);
|
|
}
|
|
__arm_v7s_free_table(data->pgd, 1, data);
|
|
kmem_cache_destroy(data->l2_tables);
|
|
kfree(data);
|
|
}
|
|
|
|
static arm_v7s_iopte arm_v7s_split_cont(struct arm_v7s_io_pgtable *data,
|
|
unsigned long iova, int idx, int lvl,
|
|
arm_v7s_iopte *ptep)
|
|
{
|
|
struct io_pgtable *iop = &data->iop;
|
|
arm_v7s_iopte pte;
|
|
size_t size = ARM_V7S_BLOCK_SIZE(lvl);
|
|
int i;
|
|
|
|
/* Check that we didn't lose a race to get the lock */
|
|
pte = *ptep;
|
|
if (!arm_v7s_pte_is_cont(pte, lvl))
|
|
return pte;
|
|
|
|
ptep -= idx & (ARM_V7S_CONT_PAGES - 1);
|
|
pte = arm_v7s_cont_to_pte(pte, lvl);
|
|
for (i = 0; i < ARM_V7S_CONT_PAGES; i++)
|
|
ptep[i] = pte + i * size;
|
|
|
|
__arm_v7s_pte_sync(ptep, ARM_V7S_CONT_PAGES, &iop->cfg);
|
|
|
|
size *= ARM_V7S_CONT_PAGES;
|
|
io_pgtable_tlb_flush_leaf(iop, iova, size, size);
|
|
return pte;
|
|
}
|
|
|
|
static size_t arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
|
|
struct iommu_iotlb_gather *gather,
|
|
unsigned long iova, size_t size,
|
|
arm_v7s_iopte blk_pte,
|
|
arm_v7s_iopte *ptep)
|
|
{
|
|
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
|
arm_v7s_iopte pte, *tablep;
|
|
int i, unmap_idx, num_entries, num_ptes;
|
|
|
|
tablep = __arm_v7s_alloc_table(2, GFP_ATOMIC, data);
|
|
if (!tablep)
|
|
return 0; /* Bytes unmapped */
|
|
|
|
num_ptes = ARM_V7S_PTES_PER_LVL(2);
|
|
num_entries = size >> ARM_V7S_LVL_SHIFT(2);
|
|
unmap_idx = ARM_V7S_LVL_IDX(iova, 2);
|
|
|
|
pte = arm_v7s_prot_to_pte(arm_v7s_pte_to_prot(blk_pte, 1), 2, cfg);
|
|
if (num_entries > 1)
|
|
pte = arm_v7s_pte_to_cont(pte, 2);
|
|
|
|
for (i = 0; i < num_ptes; i += num_entries, pte += size) {
|
|
/* Unmap! */
|
|
if (i == unmap_idx)
|
|
continue;
|
|
|
|
__arm_v7s_set_pte(&tablep[i], pte, num_entries, cfg);
|
|
}
|
|
|
|
pte = arm_v7s_install_table(tablep, ptep, blk_pte, cfg);
|
|
if (pte != blk_pte) {
|
|
__arm_v7s_free_table(tablep, 2, data);
|
|
|
|
if (!ARM_V7S_PTE_IS_TABLE(pte, 1))
|
|
return 0;
|
|
|
|
tablep = iopte_deref(pte, 1, data);
|
|
return __arm_v7s_unmap(data, gather, iova, size, 2, tablep);
|
|
}
|
|
|
|
io_pgtable_tlb_add_page(&data->iop, gather, iova, size);
|
|
return size;
|
|
}
|
|
|
|
static size_t __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
|
|
struct iommu_iotlb_gather *gather,
|
|
unsigned long iova, size_t size, int lvl,
|
|
arm_v7s_iopte *ptep)
|
|
{
|
|
arm_v7s_iopte pte[ARM_V7S_CONT_PAGES];
|
|
struct io_pgtable *iop = &data->iop;
|
|
int idx, i = 0, num_entries = size >> ARM_V7S_LVL_SHIFT(lvl);
|
|
|
|
/* Something went horribly wrong and we ran out of page table */
|
|
if (WARN_ON(lvl > 2))
|
|
return 0;
|
|
|
|
idx = ARM_V7S_LVL_IDX(iova, lvl);
|
|
ptep += idx;
|
|
do {
|
|
pte[i] = READ_ONCE(ptep[i]);
|
|
if (WARN_ON(!ARM_V7S_PTE_IS_VALID(pte[i])))
|
|
return 0;
|
|
} while (++i < num_entries);
|
|
|
|
/*
|
|
* If we've hit a contiguous 'large page' entry at this level, it
|
|
* needs splitting first, unless we're unmapping the whole lot.
|
|
*
|
|
* For splitting, we can't rewrite 16 PTEs atomically, and since we
|
|
* can't necessarily assume TEX remap we don't have a software bit to
|
|
* mark live entries being split. In practice (i.e. DMA API code), we
|
|
* will never be splitting large pages anyway, so just wrap this edge
|
|
* case in a lock for the sake of correctness and be done with it.
|
|
*/
|
|
if (num_entries <= 1 && arm_v7s_pte_is_cont(pte[0], lvl)) {
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&data->split_lock, flags);
|
|
pte[0] = arm_v7s_split_cont(data, iova, idx, lvl, ptep);
|
|
spin_unlock_irqrestore(&data->split_lock, flags);
|
|
}
|
|
|
|
/* If the size matches this level, we're in the right place */
|
|
if (num_entries) {
|
|
size_t blk_size = ARM_V7S_BLOCK_SIZE(lvl);
|
|
|
|
__arm_v7s_set_pte(ptep, 0, num_entries, &iop->cfg);
|
|
|
|
for (i = 0; i < num_entries; i++) {
|
|
if (ARM_V7S_PTE_IS_TABLE(pte[i], lvl)) {
|
|
/* Also flush any partial walks */
|
|
io_pgtable_tlb_flush_walk(iop, iova, blk_size,
|
|
ARM_V7S_BLOCK_SIZE(lvl + 1));
|
|
ptep = iopte_deref(pte[i], lvl, data);
|
|
__arm_v7s_free_table(ptep, lvl + 1, data);
|
|
} else if (iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT) {
|
|
/*
|
|
* Order the PTE update against queueing the IOVA, to
|
|
* guarantee that a flush callback from a different CPU
|
|
* has observed it before the TLBIALL can be issued.
|
|
*/
|
|
smp_wmb();
|
|
} else {
|
|
io_pgtable_tlb_add_page(iop, gather, iova, blk_size);
|
|
}
|
|
iova += blk_size;
|
|
}
|
|
return size;
|
|
} else if (lvl == 1 && !ARM_V7S_PTE_IS_TABLE(pte[0], lvl)) {
|
|
/*
|
|
* Insert a table at the next level to map the old region,
|
|
* minus the part we want to unmap
|
|
*/
|
|
return arm_v7s_split_blk_unmap(data, gather, iova, size, pte[0],
|
|
ptep);
|
|
}
|
|
|
|
/* Keep on walkin' */
|
|
ptep = iopte_deref(pte[0], lvl, data);
|
|
return __arm_v7s_unmap(data, gather, iova, size, lvl + 1, ptep);
|
|
}
|
|
|
|
static size_t arm_v7s_unmap(struct io_pgtable_ops *ops, unsigned long iova,
|
|
size_t size, struct iommu_iotlb_gather *gather)
|
|
{
|
|
struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
|
|
if (WARN_ON(upper_32_bits(iova)))
|
|
return 0;
|
|
|
|
return __arm_v7s_unmap(data, gather, iova, size, 1, data->pgd);
|
|
}
|
|
|
|
static phys_addr_t arm_v7s_iova_to_phys(struct io_pgtable_ops *ops,
|
|
unsigned long iova)
|
|
{
|
|
struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
arm_v7s_iopte *ptep = data->pgd, pte;
|
|
int lvl = 0;
|
|
u32 mask;
|
|
|
|
do {
|
|
ptep += ARM_V7S_LVL_IDX(iova, ++lvl);
|
|
pte = READ_ONCE(*ptep);
|
|
ptep = iopte_deref(pte, lvl, data);
|
|
} while (ARM_V7S_PTE_IS_TABLE(pte, lvl));
|
|
|
|
if (!ARM_V7S_PTE_IS_VALID(pte))
|
|
return 0;
|
|
|
|
mask = ARM_V7S_LVL_MASK(lvl);
|
|
if (arm_v7s_pte_is_cont(pte, lvl))
|
|
mask *= ARM_V7S_CONT_PAGES;
|
|
return iopte_to_paddr(pte, lvl, &data->iop.cfg) | (iova & ~mask);
|
|
}
|
|
|
|
static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
|
|
void *cookie)
|
|
{
|
|
struct arm_v7s_io_pgtable *data;
|
|
|
|
if (cfg->ias > ARM_V7S_ADDR_BITS)
|
|
return NULL;
|
|
|
|
if (cfg->oas > (arm_v7s_is_mtk_enabled(cfg) ? 34 : ARM_V7S_ADDR_BITS))
|
|
return NULL;
|
|
|
|
if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
|
|
IO_PGTABLE_QUIRK_NO_PERMS |
|
|
IO_PGTABLE_QUIRK_TLBI_ON_MAP |
|
|
IO_PGTABLE_QUIRK_ARM_MTK_EXT |
|
|
IO_PGTABLE_QUIRK_NON_STRICT))
|
|
return NULL;
|
|
|
|
/* If ARM_MTK_4GB is enabled, the NO_PERMS is also expected. */
|
|
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_MTK_EXT &&
|
|
!(cfg->quirks & IO_PGTABLE_QUIRK_NO_PERMS))
|
|
return NULL;
|
|
|
|
data = kmalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
spin_lock_init(&data->split_lock);
|
|
data->l2_tables = kmem_cache_create("io-pgtable_armv7s_l2",
|
|
ARM_V7S_TABLE_SIZE(2),
|
|
ARM_V7S_TABLE_SIZE(2),
|
|
ARM_V7S_TABLE_SLAB_FLAGS, NULL);
|
|
if (!data->l2_tables)
|
|
goto out_free_data;
|
|
|
|
data->iop.ops = (struct io_pgtable_ops) {
|
|
.map = arm_v7s_map,
|
|
.unmap = arm_v7s_unmap,
|
|
.iova_to_phys = arm_v7s_iova_to_phys,
|
|
};
|
|
|
|
/* We have to do this early for __arm_v7s_alloc_table to work... */
|
|
data->iop.cfg = *cfg;
|
|
|
|
/*
|
|
* Unless the IOMMU driver indicates supersection support by
|
|
* having SZ_16M set in the initial bitmap, they won't be used.
|
|
*/
|
|
cfg->pgsize_bitmap &= SZ_4K | SZ_64K | SZ_1M | SZ_16M;
|
|
|
|
/* TCR: T0SZ=0, EAE=0 (if applicable) */
|
|
cfg->arm_v7s_cfg.tcr = 0;
|
|
|
|
/*
|
|
* TEX remap: the indices used map to the closest equivalent types
|
|
* under the non-TEX-remap interpretation of those attribute bits,
|
|
* excepting various implementation-defined aspects of shareability.
|
|
*/
|
|
cfg->arm_v7s_cfg.prrr = ARM_V7S_PRRR_TR(1, ARM_V7S_PRRR_TYPE_DEVICE) |
|
|
ARM_V7S_PRRR_TR(4, ARM_V7S_PRRR_TYPE_NORMAL) |
|
|
ARM_V7S_PRRR_TR(7, ARM_V7S_PRRR_TYPE_NORMAL) |
|
|
ARM_V7S_PRRR_DS0 | ARM_V7S_PRRR_DS1 |
|
|
ARM_V7S_PRRR_NS1 | ARM_V7S_PRRR_NOS(7);
|
|
cfg->arm_v7s_cfg.nmrr = ARM_V7S_NMRR_IR(7, ARM_V7S_RGN_WBWA) |
|
|
ARM_V7S_NMRR_OR(7, ARM_V7S_RGN_WBWA);
|
|
|
|
/* Looking good; allocate a pgd */
|
|
data->pgd = __arm_v7s_alloc_table(1, GFP_KERNEL, data);
|
|
if (!data->pgd)
|
|
goto out_free_data;
|
|
|
|
/* Ensure the empty pgd is visible before any actual TTBR write */
|
|
wmb();
|
|
|
|
/* TTBR */
|
|
cfg->arm_v7s_cfg.ttbr = virt_to_phys(data->pgd) | ARM_V7S_TTBR_S |
|
|
(cfg->coherent_walk ? (ARM_V7S_TTBR_NOS |
|
|
ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_WBWA) |
|
|
ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_WBWA)) :
|
|
(ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_NC) |
|
|
ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_NC)));
|
|
return &data->iop;
|
|
|
|
out_free_data:
|
|
kmem_cache_destroy(data->l2_tables);
|
|
kfree(data);
|
|
return NULL;
|
|
}
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns = {
|
|
.alloc = arm_v7s_alloc_pgtable,
|
|
.free = arm_v7s_free_pgtable,
|
|
};
|
|
|
|
#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
|
|
|
|
static struct io_pgtable_cfg *cfg_cookie __initdata;
|
|
|
|
static void __init dummy_tlb_flush_all(void *cookie)
|
|
{
|
|
WARN_ON(cookie != cfg_cookie);
|
|
}
|
|
|
|
static void __init dummy_tlb_flush(unsigned long iova, size_t size,
|
|
size_t granule, void *cookie)
|
|
{
|
|
WARN_ON(cookie != cfg_cookie);
|
|
WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
|
|
}
|
|
|
|
static void __init dummy_tlb_add_page(struct iommu_iotlb_gather *gather,
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|
unsigned long iova, size_t granule,
|
|
void *cookie)
|
|
{
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|
dummy_tlb_flush(iova, granule, granule, cookie);
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|
}
|
|
|
|
static const struct iommu_flush_ops dummy_tlb_ops __initconst = {
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|
.tlb_flush_all = dummy_tlb_flush_all,
|
|
.tlb_flush_walk = dummy_tlb_flush,
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|
.tlb_flush_leaf = dummy_tlb_flush,
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|
.tlb_add_page = dummy_tlb_add_page,
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|
};
|
|
|
|
#define __FAIL(ops) ({ \
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|
WARN(1, "selftest: test failed\n"); \
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|
selftest_running = false; \
|
|
-EFAULT; \
|
|
})
|
|
|
|
static int __init arm_v7s_do_selftests(void)
|
|
{
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|
struct io_pgtable_ops *ops;
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|
struct io_pgtable_cfg cfg = {
|
|
.tlb = &dummy_tlb_ops,
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|
.oas = 32,
|
|
.ias = 32,
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|
.coherent_walk = true,
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|
.quirks = IO_PGTABLE_QUIRK_ARM_NS,
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|
.pgsize_bitmap = SZ_4K | SZ_64K | SZ_1M | SZ_16M,
|
|
};
|
|
unsigned int iova, size, iova_start;
|
|
unsigned int i, loopnr = 0;
|
|
|
|
selftest_running = true;
|
|
|
|
cfg_cookie = &cfg;
|
|
|
|
ops = alloc_io_pgtable_ops(ARM_V7S, &cfg, &cfg);
|
|
if (!ops) {
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|
pr_err("selftest: failed to allocate io pgtable ops\n");
|
|
return -EINVAL;
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|
}
|
|
|
|
/*
|
|
* Initial sanity checks.
|
|
* Empty page tables shouldn't provide any translations.
|
|
*/
|
|
if (ops->iova_to_phys(ops, 42))
|
|
return __FAIL(ops);
|
|
|
|
if (ops->iova_to_phys(ops, SZ_1G + 42))
|
|
return __FAIL(ops);
|
|
|
|
if (ops->iova_to_phys(ops, SZ_2G + 42))
|
|
return __FAIL(ops);
|
|
|
|
/*
|
|
* Distinct mappings of different granule sizes.
|
|
*/
|
|
iova = 0;
|
|
for_each_set_bit(i, &cfg.pgsize_bitmap, BITS_PER_LONG) {
|
|
size = 1UL << i;
|
|
if (ops->map(ops, iova, iova, size, IOMMU_READ |
|
|
IOMMU_WRITE |
|
|
IOMMU_NOEXEC |
|
|
IOMMU_CACHE))
|
|
return __FAIL(ops);
|
|
|
|
/* Overlapping mappings */
|
|
if (!ops->map(ops, iova, iova + size, size,
|
|
IOMMU_READ | IOMMU_NOEXEC))
|
|
return __FAIL(ops);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
|
|
return __FAIL(ops);
|
|
|
|
iova += SZ_16M;
|
|
loopnr++;
|
|
}
|
|
|
|
/* Partial unmap */
|
|
i = 1;
|
|
size = 1UL << __ffs(cfg.pgsize_bitmap);
|
|
while (i < loopnr) {
|
|
iova_start = i * SZ_16M;
|
|
if (ops->unmap(ops, iova_start + size, size, NULL) != size)
|
|
return __FAIL(ops);
|
|
|
|
/* Remap of partial unmap */
|
|
if (ops->map(ops, iova_start + size, size, size, IOMMU_READ))
|
|
return __FAIL(ops);
|
|
|
|
if (ops->iova_to_phys(ops, iova_start + size + 42)
|
|
!= (size + 42))
|
|
return __FAIL(ops);
|
|
i++;
|
|
}
|
|
|
|
/* Full unmap */
|
|
iova = 0;
|
|
for_each_set_bit(i, &cfg.pgsize_bitmap, BITS_PER_LONG) {
|
|
size = 1UL << i;
|
|
|
|
if (ops->unmap(ops, iova, size, NULL) != size)
|
|
return __FAIL(ops);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42))
|
|
return __FAIL(ops);
|
|
|
|
/* Remap full block */
|
|
if (ops->map(ops, iova, iova, size, IOMMU_WRITE))
|
|
return __FAIL(ops);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
|
|
return __FAIL(ops);
|
|
|
|
iova += SZ_16M;
|
|
}
|
|
|
|
free_io_pgtable_ops(ops);
|
|
|
|
selftest_running = false;
|
|
|
|
pr_info("self test ok\n");
|
|
return 0;
|
|
}
|
|
subsys_initcall(arm_v7s_do_selftests);
|
|
#endif
|