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iommu/io-pgtable: Add ARMv7 short descriptor support
Add a nearly-complete ARMv7 short descriptor implementation, omitting only a few legacy and CPU-centric aspects which shouldn't be necessary for IOMMU API use anyway. Reviewed-by: Yong Wu <yong.wu@mediatek.com> Tested-by: Yong Wu <yong.wu@mediatek.com> Signed-off-by: Yong Wu <yong.wu@mediatek.com> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Robin Murphy
Will Deacon
parent
18558cae02
commit
e5fc9753b1
@ -39,6 +39,25 @@ config IOMMU_IO_PGTABLE_LPAE_SELFTEST
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If unsure, say N here.
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config IOMMU_IO_PGTABLE_ARMV7S
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bool "ARMv7/v8 Short Descriptor Format"
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select IOMMU_IO_PGTABLE
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depends on HAS_DMA && (ARM || ARM64 || COMPILE_TEST)
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help
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Enable support for the ARM Short-descriptor pagetable format.
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This supports 32-bit virtual and physical addresses mapped using
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2-level tables with 4KB pages/1MB sections, and contiguous entries
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for 64KB pages/16MB supersections if indicated by the IOMMU driver.
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config IOMMU_IO_PGTABLE_ARMV7S_SELFTEST
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bool "ARMv7s selftests"
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depends on IOMMU_IO_PGTABLE_ARMV7S
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help
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Enable self-tests for ARMv7s page table allocator. This performs
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a series of page-table consistency checks during boot.
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If unsure, say N here.
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endmenu
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config IOMMU_IOVA
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@ -3,6 +3,7 @@ obj-$(CONFIG_IOMMU_API) += iommu-traces.o
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obj-$(CONFIG_IOMMU_API) += iommu-sysfs.o
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obj-$(CONFIG_IOMMU_DMA) += dma-iommu.o
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obj-$(CONFIG_IOMMU_IO_PGTABLE) += io-pgtable.o
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obj-$(CONFIG_IOMMU_IO_PGTABLE_ARMV7S) += io-pgtable-arm-v7s.o
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obj-$(CONFIG_IOMMU_IO_PGTABLE_LPAE) += io-pgtable-arm.o
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obj-$(CONFIG_IOMMU_IOVA) += iova.o
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obj-$(CONFIG_OF_IOMMU) += of_iommu.o
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849
drivers/iommu/io-pgtable-arm-v7s.c
Normal file
849
drivers/iommu/io-pgtable-arm-v7s.c
Normal file
@ -0,0 +1,849 @@
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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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* 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) 2014-2015 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/dma-mapping.h>
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#include <linux/gfp.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/types.h>
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#include <asm/barrier.h>
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#include "io-pgtable.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) (lvl == 1 && ((pte) & 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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/* *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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#define ARM_V7S_TCR_PD1 BIT(5)
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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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};
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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 arm_v7s_iopte *iopte_deref(arm_v7s_iopte pte, int lvl)
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{
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if (ARM_V7S_PTE_IS_TABLE(pte, lvl))
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pte &= ARM_V7S_TABLE_MASK;
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else
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pte &= ARM_V7S_LVL_MASK(lvl);
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return phys_to_virt(pte);
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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 device *dev = data->iop.cfg.iommu_dev;
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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_dma_pages(__GFP_ZERO, 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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if (table && !selftest_running) {
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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 != virt_to_phys(table))
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goto out_unmap;
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}
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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 device *dev = data->iop.cfg.iommu_dev;
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size_t size = ARM_V7S_TABLE_SIZE(lvl);
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if (!selftest_running)
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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 (selftest_running)
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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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ARM_V7S_ATTR_TEX(1);
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if (ap) {
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pte |= ARM_V7S_PTE_AF | 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_CACHE)
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pte |= ARM_V7S_ATTR_B | ARM_V7S_ATTR_C;
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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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if (pte & (ARM_V7S_PTE_AP_RDONLY << ARM_V7S_ATTR_SHIFT(lvl)))
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prot |= IOMMU_WRITE;
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if (pte & ARM_V7S_ATTR_C)
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prot |= IOMMU_CACHE;
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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 int __arm_v7s_unmap(struct arm_v7s_io_pgtable *, 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 = arm_v7s_prot_to_pte(prot, lvl, cfg);
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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)) {
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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_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, 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_PTE_TYPE_PAGE;
|
||||
if (lvl == 1 && (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS))
|
||||
pte |= ARM_V7S_ATTR_NS_SECTION;
|
||||
|
||||
if (num_entries > 1)
|
||||
pte = arm_v7s_pte_to_cont(pte, lvl);
|
||||
|
||||
pte |= paddr & ARM_V7S_LVL_MASK(lvl);
|
||||
|
||||
__arm_v7s_set_pte(ptep, pte, num_entries, cfg);
|
||||
return 0;
|
||||
}
|
||||
|
||||
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 = *ptep;
|
||||
if (!pte) {
|
||||
cptep = __arm_v7s_alloc_table(lvl + 1, GFP_ATOMIC, data);
|
||||
if (!cptep)
|
||||
return -ENOMEM;
|
||||
|
||||
pte = virt_to_phys(cptep) | ARM_V7S_PTE_TYPE_TABLE;
|
||||
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
|
||||
pte |= ARM_V7S_ATTR_NS_TABLE;
|
||||
|
||||
__arm_v7s_set_pte(ptep, pte, 1, cfg);
|
||||
} else {
|
||||
cptep = iopte_deref(pte, lvl);
|
||||
}
|
||||
|
||||
/* 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_cfg *cfg = &data->iop.cfg;
|
||||
const struct iommu_gather_ops *tlb = cfg->tlb;
|
||||
void *cookie = data->iop.cookie;
|
||||
int ret;
|
||||
|
||||
/* If no access, then nothing to do */
|
||||
if (!(prot & (IOMMU_READ | IOMMU_WRITE)))
|
||||
return 0;
|
||||
|
||||
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 (cfg->quirks & IO_PGTABLE_QUIRK_TLBI_ON_MAP) {
|
||||
tlb->tlb_add_flush(iova, size, ARM_V7S_BLOCK_SIZE(2), false,
|
||||
cookie);
|
||||
tlb->tlb_sync(cookie);
|
||||
} 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), 2, data);
|
||||
}
|
||||
__arm_v7s_free_table(data->pgd, 1, data);
|
||||
kmem_cache_destroy(data->l2_tables);
|
||||
kfree(data);
|
||||
}
|
||||
|
||||
static void arm_v7s_split_cont(struct arm_v7s_io_pgtable *data,
|
||||
unsigned long iova, int idx, int lvl,
|
||||
arm_v7s_iopte *ptep)
|
||||
{
|
||||
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
||||
void *cookie = data->iop.cookie;
|
||||
arm_v7s_iopte pte;
|
||||
size_t size = ARM_V7S_BLOCK_SIZE(lvl);
|
||||
int i;
|
||||
|
||||
ptep -= idx & (ARM_V7S_CONT_PAGES - 1);
|
||||
pte = arm_v7s_cont_to_pte(*ptep, lvl);
|
||||
for (i = 0; i < ARM_V7S_CONT_PAGES; i++) {
|
||||
ptep[i] = pte;
|
||||
pte += size;
|
||||
}
|
||||
|
||||
__arm_v7s_pte_sync(ptep, ARM_V7S_CONT_PAGES, cfg);
|
||||
|
||||
size *= ARM_V7S_CONT_PAGES;
|
||||
cfg->tlb->tlb_add_flush(iova, size, size, true, cookie);
|
||||
cfg->tlb->tlb_sync(cookie);
|
||||
}
|
||||
|
||||
static int arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
|
||||
unsigned long iova, size_t size,
|
||||
arm_v7s_iopte *ptep)
|
||||
{
|
||||
unsigned long blk_start, blk_end, blk_size;
|
||||
phys_addr_t blk_paddr;
|
||||
arm_v7s_iopte table = 0;
|
||||
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
||||
int prot = arm_v7s_pte_to_prot(*ptep, 1);
|
||||
|
||||
blk_size = ARM_V7S_BLOCK_SIZE(1);
|
||||
blk_start = iova & ARM_V7S_LVL_MASK(1);
|
||||
blk_end = blk_start + ARM_V7S_BLOCK_SIZE(1);
|
||||
blk_paddr = *ptep & ARM_V7S_LVL_MASK(1);
|
||||
|
||||
for (; blk_start < blk_end; blk_start += size, blk_paddr += size) {
|
||||
arm_v7s_iopte *tablep;
|
||||
|
||||
/* Unmap! */
|
||||
if (blk_start == iova)
|
||||
continue;
|
||||
|
||||
/* __arm_v7s_map expects a pointer to the start of the table */
|
||||
tablep = &table - ARM_V7S_LVL_IDX(blk_start, 1);
|
||||
if (__arm_v7s_map(data, blk_start, blk_paddr, size, prot, 1,
|
||||
tablep) < 0) {
|
||||
if (table) {
|
||||
/* Free the table we allocated */
|
||||
tablep = iopte_deref(table, 1);
|
||||
__arm_v7s_free_table(tablep, 2, data);
|
||||
}
|
||||
return 0; /* Bytes unmapped */
|
||||
}
|
||||
}
|
||||
|
||||
__arm_v7s_set_pte(ptep, table, 1, cfg);
|
||||
iova &= ~(blk_size - 1);
|
||||
cfg->tlb->tlb_add_flush(iova, blk_size, blk_size, true, data->iop.cookie);
|
||||
return size;
|
||||
}
|
||||
|
||||
static int __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
|
||||
unsigned long iova, size_t size, int lvl,
|
||||
arm_v7s_iopte *ptep)
|
||||
{
|
||||
arm_v7s_iopte pte[ARM_V7S_CONT_PAGES];
|
||||
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
||||
const struct iommu_gather_ops *tlb = cfg->tlb;
|
||||
void *cookie = data->iop.cookie;
|
||||
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 {
|
||||
if (WARN_ON(!ARM_V7S_PTE_IS_VALID(ptep[i])))
|
||||
return 0;
|
||||
pte[i] = ptep[i];
|
||||
} 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.
|
||||
*/
|
||||
if (num_entries <= 1 && arm_v7s_pte_is_cont(pte[0], lvl))
|
||||
arm_v7s_split_cont(data, iova, idx, lvl, ptep);
|
||||
|
||||
/* 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, cfg);
|
||||
|
||||
for (i = 0; i < num_entries; i++) {
|
||||
if (ARM_V7S_PTE_IS_TABLE(pte[i], lvl)) {
|
||||
/* Also flush any partial walks */
|
||||
tlb->tlb_add_flush(iova, blk_size,
|
||||
ARM_V7S_BLOCK_SIZE(lvl + 1),
|
||||
false, cookie);
|
||||
tlb->tlb_sync(cookie);
|
||||
ptep = iopte_deref(pte[i], lvl);
|
||||
__arm_v7s_free_table(ptep, lvl + 1, data);
|
||||
} else {
|
||||
tlb->tlb_add_flush(iova, blk_size, blk_size,
|
||||
true, cookie);
|
||||
}
|
||||
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, iova, size, ptep);
|
||||
}
|
||||
|
||||
/* Keep on walkin' */
|
||||
ptep = iopte_deref(pte[0], lvl);
|
||||
return __arm_v7s_unmap(data, iova, size, lvl + 1, ptep);
|
||||
}
|
||||
|
||||
static int arm_v7s_unmap(struct io_pgtable_ops *ops, unsigned long iova,
|
||||
size_t size)
|
||||
{
|
||||
size_t unmapped;
|
||||
struct arm_v7s_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
||||
struct io_pgtable *iop = &data->iop;
|
||||
|
||||
unmapped = __arm_v7s_unmap(data, iova, size, 1, data->pgd);
|
||||
if (unmapped)
|
||||
iop->cfg.tlb->tlb_sync(iop->cookie);
|
||||
|
||||
return unmapped;
|
||||
}
|
||||
|
||||
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 {
|
||||
pte = ptep[ARM_V7S_LVL_IDX(iova, ++lvl)];
|
||||
ptep = iopte_deref(pte, lvl);
|
||||
} 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 (pte & mask) | (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 || cfg->oas > ARM_V7S_ADDR_BITS)
|
||||
return NULL;
|
||||
|
||||
data = kmalloc(sizeof(*data), GFP_KERNEL);
|
||||
if (!data)
|
||||
return NULL;
|
||||
|
||||
data->l2_tables = kmem_cache_create("io-pgtable_armv7s_l2",
|
||||
ARM_V7S_TABLE_SIZE(2),
|
||||
ARM_V7S_TABLE_SIZE(2),
|
||||
SLAB_CACHE_DMA, 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, disable TTBR1 */
|
||||
cfg->arm_v7s_cfg.tcr = ARM_V7S_TCR_PD1;
|
||||
|
||||
/*
|
||||
* 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();
|
||||
|
||||
/* TTBRs */
|
||||
cfg->arm_v7s_cfg.ttbr[0] = virt_to_phys(data->pgd) |
|
||||
ARM_V7S_TTBR_S | ARM_V7S_TTBR_NOS |
|
||||
ARM_V7S_TTBR_IRGN_ATTR(ARM_V7S_RGN_WBWA) |
|
||||
ARM_V7S_TTBR_ORGN_ATTR(ARM_V7S_RGN_WBWA);
|
||||
cfg->arm_v7s_cfg.ttbr[1] = 0;
|
||||
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;
|
||||
|
||||
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);
|
||||
WARN_ON(!(size & cfg_cookie->pgsize_bitmap));
|
||||
}
|
||||
|
||||
static void dummy_tlb_sync(void *cookie)
|
||||
{
|
||||
WARN_ON(cookie != cfg_cookie);
|
||||
}
|
||||
|
||||
static struct iommu_gather_ops dummy_tlb_ops = {
|
||||
.tlb_flush_all = dummy_tlb_flush_all,
|
||||
.tlb_add_flush = dummy_tlb_add_flush,
|
||||
.tlb_sync = dummy_tlb_sync,
|
||||
};
|
||||
|
||||
#define __FAIL(ops) ({ \
|
||||
WARN(1, "selftest: test failed\n"); \
|
||||
selftest_running = false; \
|
||||
-EFAULT; \
|
||||
})
|
||||
|
||||
static int __init arm_v7s_do_selftests(void)
|
||||
{
|
||||
struct io_pgtable_ops *ops;
|
||||
struct io_pgtable_cfg cfg = {
|
||||
.tlb = &dummy_tlb_ops,
|
||||
.oas = 32,
|
||||
.ias = 32,
|
||||
.quirks = IO_PGTABLE_QUIRK_ARM_NS,
|
||||
.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) {
|
||||
pr_err("selftest: failed to allocate io pgtable ops\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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;
|
||||
i = find_first_bit(&cfg.pgsize_bitmap, BITS_PER_LONG);
|
||||
while (i != 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;
|
||||
i++;
|
||||
i = find_next_bit(&cfg.pgsize_bitmap, BITS_PER_LONG, i);
|
||||
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) != 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;
|
||||
i = find_first_bit(&cfg.pgsize_bitmap, BITS_PER_LONG);
|
||||
while (i != BITS_PER_LONG) {
|
||||
size = 1UL << i;
|
||||
|
||||
if (ops->unmap(ops, iova, size) != 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;
|
||||
i++;
|
||||
i = find_next_bit(&cfg.pgsize_bitmap, BITS_PER_LONG, i);
|
||||
}
|
||||
|
||||
free_io_pgtable_ops(ops);
|
||||
|
||||
selftest_running = false;
|
||||
|
||||
pr_info("self test ok\n");
|
||||
return 0;
|
||||
}
|
||||
subsys_initcall(arm_v7s_do_selftests);
|
||||
#endif
|
||||
@ -33,6 +33,9 @@ io_pgtable_init_table[IO_PGTABLE_NUM_FMTS] =
|
||||
[ARM_64_LPAE_S1] = &io_pgtable_arm_64_lpae_s1_init_fns,
|
||||
[ARM_64_LPAE_S2] = &io_pgtable_arm_64_lpae_s2_init_fns,
|
||||
#endif
|
||||
#ifdef CONFIG_IOMMU_IO_PGTABLE_ARMV7S
|
||||
[ARM_V7S] = &io_pgtable_arm_v7s_init_fns,
|
||||
#endif
|
||||
};
|
||||
|
||||
struct io_pgtable_ops *alloc_io_pgtable_ops(enum io_pgtable_fmt fmt,
|
||||
|
||||
@ -1,5 +1,6 @@
|
||||
#ifndef __IO_PGTABLE_H
|
||||
#define __IO_PGTABLE_H
|
||||
#include <linux/bitops.h>
|
||||
|
||||
/*
|
||||
* Public API for use by IOMMU drivers
|
||||
@ -9,6 +10,7 @@ enum io_pgtable_fmt {
|
||||
ARM_32_LPAE_S2,
|
||||
ARM_64_LPAE_S1,
|
||||
ARM_64_LPAE_S2,
|
||||
ARM_V7S,
|
||||
IO_PGTABLE_NUM_FMTS,
|
||||
};
|
||||
|
||||
@ -45,7 +47,9 @@ struct iommu_gather_ops {
|
||||
* page table walker.
|
||||
*/
|
||||
struct io_pgtable_cfg {
|
||||
#define IO_PGTABLE_QUIRK_ARM_NS (1 << 0) /* Set NS bit in PTEs */
|
||||
#define IO_PGTABLE_QUIRK_ARM_NS BIT(0) /* Set NS bit in PTEs */
|
||||
#define IO_PGTABLE_QUIRK_NO_PERMS BIT(1) /* No AP/XN bits */
|
||||
#define IO_PGTABLE_QUIRK_TLBI_ON_MAP BIT(2) /* TLB Inv. on map */
|
||||
int quirks;
|
||||
unsigned long pgsize_bitmap;
|
||||
unsigned int ias;
|
||||
@ -65,6 +69,13 @@ struct io_pgtable_cfg {
|
||||
u64 vttbr;
|
||||
u64 vtcr;
|
||||
} arm_lpae_s2_cfg;
|
||||
|
||||
struct {
|
||||
u32 ttbr[2];
|
||||
u32 tcr;
|
||||
u32 nmrr;
|
||||
u32 prrr;
|
||||
} arm_v7s_cfg;
|
||||
};
|
||||
};
|
||||
|
||||
@ -149,5 +160,6 @@ extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns;
|
||||
extern struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns;
|
||||
extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns;
|
||||
extern struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns;
|
||||
extern struct io_pgtable_init_fns io_pgtable_arm_v7s_init_fns;
|
||||
|
||||
#endif /* __IO_PGTABLE_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user