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![Hector Martin](/assets/img/avatar_default.png)
Table descriptors were being installed without properly formatting the
address using paddr_to_iopte, which does not match up with the
iopte_deref in __arm_lpae_map. This is incorrect for the LPAE pte
format, as it does not handle the high bits properly.
This was found on Apple T6000 DARTs, which require a new pte format
(different shift); adding support for that to
paddr_to_iopte/iopte_to_paddr caused it to break badly, as even <48-bit
addresses would end up incorrect in that case.
Fixes: 6c89928ff7
("iommu/io-pgtable-arm: Support 52-bit physical address")
Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Hector Martin <marcan@marcan.st>
Link: https://lore.kernel.org/r/20211120031343.88034-1-marcan@marcan.st
Signed-off-by: Joerg Roedel <jroedel@suse.de>
1369 lines
36 KiB
C
1369 lines
36 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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* Copyright (C) 2014 ARM Limited
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*
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* Author: Will Deacon <will.deacon@arm.com>
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*/
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#define pr_fmt(fmt) "arm-lpae io-pgtable: " fmt
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/io-pgtable.h>
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#include <linux/kernel.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <asm/barrier.h>
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#include "io-pgtable-arm.h"
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#define ARM_LPAE_MAX_ADDR_BITS 52
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#define ARM_LPAE_S2_MAX_CONCAT_PAGES 16
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#define ARM_LPAE_MAX_LEVELS 4
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/* Struct accessors */
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#define io_pgtable_to_data(x) \
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container_of((x), struct arm_lpae_io_pgtable, iop)
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#define io_pgtable_ops_to_data(x) \
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io_pgtable_to_data(io_pgtable_ops_to_pgtable(x))
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/*
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* Calculate the right shift amount to get to the portion describing level l
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* in a virtual address mapped by the pagetable in d.
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*/
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#define ARM_LPAE_LVL_SHIFT(l,d) \
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(((ARM_LPAE_MAX_LEVELS - (l)) * (d)->bits_per_level) + \
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ilog2(sizeof(arm_lpae_iopte)))
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#define ARM_LPAE_GRANULE(d) \
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(sizeof(arm_lpae_iopte) << (d)->bits_per_level)
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#define ARM_LPAE_PGD_SIZE(d) \
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(sizeof(arm_lpae_iopte) << (d)->pgd_bits)
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#define ARM_LPAE_PTES_PER_TABLE(d) \
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(ARM_LPAE_GRANULE(d) >> ilog2(sizeof(arm_lpae_iopte)))
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/*
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* Calculate the index at level l used to map virtual address a using the
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* pagetable in d.
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*/
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#define ARM_LPAE_PGD_IDX(l,d) \
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((l) == (d)->start_level ? (d)->pgd_bits - (d)->bits_per_level : 0)
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#define ARM_LPAE_LVL_IDX(a,l,d) \
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(((u64)(a) >> ARM_LPAE_LVL_SHIFT(l,d)) & \
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((1 << ((d)->bits_per_level + ARM_LPAE_PGD_IDX(l,d))) - 1))
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/* Calculate the block/page mapping size at level l for pagetable in d. */
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#define ARM_LPAE_BLOCK_SIZE(l,d) (1ULL << ARM_LPAE_LVL_SHIFT(l,d))
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/* Page table bits */
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#define ARM_LPAE_PTE_TYPE_SHIFT 0
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#define ARM_LPAE_PTE_TYPE_MASK 0x3
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#define ARM_LPAE_PTE_TYPE_BLOCK 1
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#define ARM_LPAE_PTE_TYPE_TABLE 3
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#define ARM_LPAE_PTE_TYPE_PAGE 3
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#define ARM_LPAE_PTE_ADDR_MASK GENMASK_ULL(47,12)
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#define ARM_LPAE_PTE_NSTABLE (((arm_lpae_iopte)1) << 63)
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#define ARM_LPAE_PTE_XN (((arm_lpae_iopte)3) << 53)
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#define ARM_LPAE_PTE_AF (((arm_lpae_iopte)1) << 10)
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#define ARM_LPAE_PTE_SH_NS (((arm_lpae_iopte)0) << 8)
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#define ARM_LPAE_PTE_SH_OS (((arm_lpae_iopte)2) << 8)
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#define ARM_LPAE_PTE_SH_IS (((arm_lpae_iopte)3) << 8)
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#define ARM_LPAE_PTE_NS (((arm_lpae_iopte)1) << 5)
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#define ARM_LPAE_PTE_VALID (((arm_lpae_iopte)1) << 0)
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#define ARM_LPAE_PTE_ATTR_LO_MASK (((arm_lpae_iopte)0x3ff) << 2)
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/* Ignore the contiguous bit for block splitting */
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#define ARM_LPAE_PTE_ATTR_HI_MASK (((arm_lpae_iopte)6) << 52)
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#define ARM_LPAE_PTE_ATTR_MASK (ARM_LPAE_PTE_ATTR_LO_MASK | \
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ARM_LPAE_PTE_ATTR_HI_MASK)
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/* Software bit for solving coherency races */
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#define ARM_LPAE_PTE_SW_SYNC (((arm_lpae_iopte)1) << 55)
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/* Stage-1 PTE */
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#define ARM_LPAE_PTE_AP_UNPRIV (((arm_lpae_iopte)1) << 6)
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#define ARM_LPAE_PTE_AP_RDONLY (((arm_lpae_iopte)2) << 6)
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#define ARM_LPAE_PTE_ATTRINDX_SHIFT 2
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#define ARM_LPAE_PTE_nG (((arm_lpae_iopte)1) << 11)
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/* Stage-2 PTE */
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#define ARM_LPAE_PTE_HAP_FAULT (((arm_lpae_iopte)0) << 6)
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#define ARM_LPAE_PTE_HAP_READ (((arm_lpae_iopte)1) << 6)
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#define ARM_LPAE_PTE_HAP_WRITE (((arm_lpae_iopte)2) << 6)
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#define ARM_LPAE_PTE_MEMATTR_OIWB (((arm_lpae_iopte)0xf) << 2)
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#define ARM_LPAE_PTE_MEMATTR_NC (((arm_lpae_iopte)0x5) << 2)
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#define ARM_LPAE_PTE_MEMATTR_DEV (((arm_lpae_iopte)0x1) << 2)
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/* Register bits */
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#define ARM_LPAE_VTCR_SL0_MASK 0x3
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#define ARM_LPAE_TCR_T0SZ_SHIFT 0
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#define ARM_LPAE_VTCR_PS_SHIFT 16
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#define ARM_LPAE_VTCR_PS_MASK 0x7
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#define ARM_LPAE_MAIR_ATTR_SHIFT(n) ((n) << 3)
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#define ARM_LPAE_MAIR_ATTR_MASK 0xff
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#define ARM_LPAE_MAIR_ATTR_DEVICE 0x04
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#define ARM_LPAE_MAIR_ATTR_NC 0x44
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#define ARM_LPAE_MAIR_ATTR_INC_OWBRWA 0xf4
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#define ARM_LPAE_MAIR_ATTR_WBRWA 0xff
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#define ARM_LPAE_MAIR_ATTR_IDX_NC 0
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#define ARM_LPAE_MAIR_ATTR_IDX_CACHE 1
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#define ARM_LPAE_MAIR_ATTR_IDX_DEV 2
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#define ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE 3
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#define ARM_MALI_LPAE_TTBR_ADRMODE_TABLE (3u << 0)
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#define ARM_MALI_LPAE_TTBR_READ_INNER BIT(2)
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#define ARM_MALI_LPAE_TTBR_SHARE_OUTER BIT(4)
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#define ARM_MALI_LPAE_MEMATTR_IMP_DEF 0x88ULL
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#define ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC 0x8DULL
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#define APPLE_DART_PTE_PROT_NO_WRITE (1<<7)
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#define APPLE_DART_PTE_PROT_NO_READ (1<<8)
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/* IOPTE accessors */
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#define iopte_deref(pte,d) __va(iopte_to_paddr(pte, d))
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#define iopte_type(pte) \
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(((pte) >> ARM_LPAE_PTE_TYPE_SHIFT) & ARM_LPAE_PTE_TYPE_MASK)
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#define iopte_prot(pte) ((pte) & ARM_LPAE_PTE_ATTR_MASK)
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struct arm_lpae_io_pgtable {
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struct io_pgtable iop;
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int pgd_bits;
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int start_level;
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int bits_per_level;
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void *pgd;
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};
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typedef u64 arm_lpae_iopte;
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static inline bool iopte_leaf(arm_lpae_iopte pte, int lvl,
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enum io_pgtable_fmt fmt)
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{
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if (lvl == (ARM_LPAE_MAX_LEVELS - 1) && fmt != ARM_MALI_LPAE)
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return iopte_type(pte) == ARM_LPAE_PTE_TYPE_PAGE;
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return iopte_type(pte) == ARM_LPAE_PTE_TYPE_BLOCK;
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}
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static arm_lpae_iopte paddr_to_iopte(phys_addr_t paddr,
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struct arm_lpae_io_pgtable *data)
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{
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arm_lpae_iopte pte = paddr;
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/* Of the bits which overlap, either 51:48 or 15:12 are always RES0 */
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return (pte | (pte >> (48 - 12))) & ARM_LPAE_PTE_ADDR_MASK;
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}
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static phys_addr_t iopte_to_paddr(arm_lpae_iopte pte,
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struct arm_lpae_io_pgtable *data)
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{
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u64 paddr = pte & ARM_LPAE_PTE_ADDR_MASK;
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if (ARM_LPAE_GRANULE(data) < SZ_64K)
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return paddr;
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/* Rotate the packed high-order bits back to the top */
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return (paddr | (paddr << (48 - 12))) & (ARM_LPAE_PTE_ADDR_MASK << 4);
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}
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static bool selftest_running = false;
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static dma_addr_t __arm_lpae_dma_addr(void *pages)
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{
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return (dma_addr_t)virt_to_phys(pages);
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}
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static void *__arm_lpae_alloc_pages(size_t size, gfp_t gfp,
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struct io_pgtable_cfg *cfg)
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{
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struct device *dev = cfg->iommu_dev;
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int order = get_order(size);
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struct page *p;
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dma_addr_t dma;
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void *pages;
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VM_BUG_ON((gfp & __GFP_HIGHMEM));
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p = alloc_pages_node(dev ? dev_to_node(dev) : NUMA_NO_NODE,
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gfp | __GFP_ZERO, order);
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if (!p)
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return NULL;
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pages = page_address(p);
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if (!cfg->coherent_walk) {
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dma = dma_map_single(dev, pages, size, DMA_TO_DEVICE);
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if (dma_mapping_error(dev, dma))
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goto out_free;
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/*
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* We depend on the IOMMU being able to work with any physical
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* address directly, so if the DMA layer suggests otherwise by
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* translating or truncating them, that bodes very badly...
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*/
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if (dma != virt_to_phys(pages))
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goto out_unmap;
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}
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return pages;
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out_unmap:
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dev_err(dev, "Cannot accommodate DMA translation for IOMMU page tables\n");
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dma_unmap_single(dev, dma, size, DMA_TO_DEVICE);
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out_free:
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__free_pages(p, order);
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return NULL;
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}
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static void __arm_lpae_free_pages(void *pages, size_t size,
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struct io_pgtable_cfg *cfg)
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{
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if (!cfg->coherent_walk)
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dma_unmap_single(cfg->iommu_dev, __arm_lpae_dma_addr(pages),
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size, DMA_TO_DEVICE);
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free_pages((unsigned long)pages, get_order(size));
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}
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static void __arm_lpae_sync_pte(arm_lpae_iopte *ptep, int num_entries,
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struct io_pgtable_cfg *cfg)
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{
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dma_sync_single_for_device(cfg->iommu_dev, __arm_lpae_dma_addr(ptep),
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sizeof(*ptep) * num_entries, DMA_TO_DEVICE);
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}
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static void __arm_lpae_clear_pte(arm_lpae_iopte *ptep, struct io_pgtable_cfg *cfg)
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{
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*ptep = 0;
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if (!cfg->coherent_walk)
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__arm_lpae_sync_pte(ptep, 1, cfg);
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}
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static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
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struct iommu_iotlb_gather *gather,
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unsigned long iova, size_t size, size_t pgcount,
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int lvl, arm_lpae_iopte *ptep);
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static void __arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
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phys_addr_t paddr, arm_lpae_iopte prot,
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int lvl, int num_entries, arm_lpae_iopte *ptep)
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{
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arm_lpae_iopte pte = prot;
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struct io_pgtable_cfg *cfg = &data->iop.cfg;
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size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
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int i;
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if (data->iop.fmt != ARM_MALI_LPAE && lvl == ARM_LPAE_MAX_LEVELS - 1)
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pte |= ARM_LPAE_PTE_TYPE_PAGE;
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else
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pte |= ARM_LPAE_PTE_TYPE_BLOCK;
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for (i = 0; i < num_entries; i++)
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ptep[i] = pte | paddr_to_iopte(paddr + i * sz, data);
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if (!cfg->coherent_walk)
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__arm_lpae_sync_pte(ptep, num_entries, cfg);
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}
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static int arm_lpae_init_pte(struct arm_lpae_io_pgtable *data,
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unsigned long iova, phys_addr_t paddr,
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arm_lpae_iopte prot, int lvl, int num_entries,
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arm_lpae_iopte *ptep)
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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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if (iopte_leaf(ptep[i], lvl, data->iop.fmt)) {
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/* We require an unmap first */
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WARN_ON(!selftest_running);
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return -EEXIST;
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} else if (iopte_type(ptep[i]) == ARM_LPAE_PTE_TYPE_TABLE) {
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/*
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* We need to unmap and free the old table before
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* overwriting it with a block entry.
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*/
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arm_lpae_iopte *tblp;
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size_t sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
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tblp = ptep - ARM_LPAE_LVL_IDX(iova, lvl, data);
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if (__arm_lpae_unmap(data, NULL, iova + i * sz, sz, 1,
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lvl, tblp) != sz) {
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WARN_ON(1);
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return -EINVAL;
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}
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}
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__arm_lpae_init_pte(data, paddr, prot, lvl, num_entries, ptep);
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return 0;
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}
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static arm_lpae_iopte arm_lpae_install_table(arm_lpae_iopte *table,
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arm_lpae_iopte *ptep,
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arm_lpae_iopte curr,
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struct arm_lpae_io_pgtable *data)
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{
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arm_lpae_iopte old, new;
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struct io_pgtable_cfg *cfg = &data->iop.cfg;
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new = paddr_to_iopte(__pa(table), data) | ARM_LPAE_PTE_TYPE_TABLE;
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if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_NS)
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new |= ARM_LPAE_PTE_NSTABLE;
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/*
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* Ensure the table itself is visible before its PTE can be.
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* Whilst we could get away with cmpxchg64_release below, this
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* doesn't have any ordering semantics when !CONFIG_SMP.
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*/
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dma_wmb();
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old = cmpxchg64_relaxed(ptep, curr, new);
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if (cfg->coherent_walk || (old & ARM_LPAE_PTE_SW_SYNC))
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return old;
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/* Even if it's not ours, there's no point waiting; just kick it */
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__arm_lpae_sync_pte(ptep, 1, cfg);
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if (old == curr)
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WRITE_ONCE(*ptep, new | ARM_LPAE_PTE_SW_SYNC);
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return old;
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}
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static int __arm_lpae_map(struct arm_lpae_io_pgtable *data, unsigned long iova,
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phys_addr_t paddr, size_t size, size_t pgcount,
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arm_lpae_iopte prot, int lvl, arm_lpae_iopte *ptep,
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gfp_t gfp, size_t *mapped)
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{
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arm_lpae_iopte *cptep, pte;
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size_t block_size = ARM_LPAE_BLOCK_SIZE(lvl, data);
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size_t tblsz = ARM_LPAE_GRANULE(data);
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struct io_pgtable_cfg *cfg = &data->iop.cfg;
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int ret = 0, num_entries, max_entries, map_idx_start;
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/* Find our entry at the current level */
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map_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
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ptep += map_idx_start;
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/* If we can install a leaf entry at this level, then do so */
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if (size == block_size) {
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max_entries = ARM_LPAE_PTES_PER_TABLE(data) - map_idx_start;
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num_entries = min_t(int, pgcount, max_entries);
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ret = arm_lpae_init_pte(data, iova, paddr, prot, lvl, num_entries, ptep);
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if (!ret && mapped)
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*mapped += num_entries * size;
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return ret;
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}
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/* We can't allocate tables at the final level */
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if (WARN_ON(lvl >= ARM_LPAE_MAX_LEVELS - 1))
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return -EINVAL;
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/* Grab a pointer to the next level */
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pte = READ_ONCE(*ptep);
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if (!pte) {
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cptep = __arm_lpae_alloc_pages(tblsz, gfp, cfg);
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if (!cptep)
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return -ENOMEM;
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pte = arm_lpae_install_table(cptep, ptep, 0, data);
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if (pte)
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__arm_lpae_free_pages(cptep, tblsz, cfg);
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} else if (!cfg->coherent_walk && !(pte & ARM_LPAE_PTE_SW_SYNC)) {
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__arm_lpae_sync_pte(ptep, 1, cfg);
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}
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if (pte && !iopte_leaf(pte, lvl, data->iop.fmt)) {
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cptep = iopte_deref(pte, data);
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} else if (pte) {
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/* We require an unmap first */
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WARN_ON(!selftest_running);
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return -EEXIST;
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}
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/* Rinse, repeat */
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return __arm_lpae_map(data, iova, paddr, size, pgcount, prot, lvl + 1,
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cptep, gfp, mapped);
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}
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static arm_lpae_iopte arm_lpae_prot_to_pte(struct arm_lpae_io_pgtable *data,
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int prot)
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{
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arm_lpae_iopte pte;
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if (data->iop.fmt == APPLE_DART) {
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pte = 0;
|
|
if (!(prot & IOMMU_WRITE))
|
|
pte |= APPLE_DART_PTE_PROT_NO_WRITE;
|
|
if (!(prot & IOMMU_READ))
|
|
pte |= APPLE_DART_PTE_PROT_NO_READ;
|
|
return pte;
|
|
}
|
|
|
|
if (data->iop.fmt == ARM_64_LPAE_S1 ||
|
|
data->iop.fmt == ARM_32_LPAE_S1) {
|
|
pte = ARM_LPAE_PTE_nG;
|
|
if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
|
|
pte |= ARM_LPAE_PTE_AP_RDONLY;
|
|
if (!(prot & IOMMU_PRIV))
|
|
pte |= ARM_LPAE_PTE_AP_UNPRIV;
|
|
} else {
|
|
pte = ARM_LPAE_PTE_HAP_FAULT;
|
|
if (prot & IOMMU_READ)
|
|
pte |= ARM_LPAE_PTE_HAP_READ;
|
|
if (prot & IOMMU_WRITE)
|
|
pte |= ARM_LPAE_PTE_HAP_WRITE;
|
|
}
|
|
|
|
/*
|
|
* Note that this logic is structured to accommodate Mali LPAE
|
|
* having stage-1-like attributes but stage-2-like permissions.
|
|
*/
|
|
if (data->iop.fmt == ARM_64_LPAE_S2 ||
|
|
data->iop.fmt == ARM_32_LPAE_S2) {
|
|
if (prot & IOMMU_MMIO)
|
|
pte |= ARM_LPAE_PTE_MEMATTR_DEV;
|
|
else if (prot & IOMMU_CACHE)
|
|
pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
|
|
else
|
|
pte |= ARM_LPAE_PTE_MEMATTR_NC;
|
|
} else {
|
|
if (prot & IOMMU_MMIO)
|
|
pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
|
|
<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
|
|
else if (prot & IOMMU_CACHE)
|
|
pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
|
|
<< ARM_LPAE_PTE_ATTRINDX_SHIFT);
|
|
}
|
|
|
|
/*
|
|
* Also Mali has its own notions of shareability wherein its Inner
|
|
* domain covers the cores within the GPU, and its Outer domain is
|
|
* "outside the GPU" (i.e. either the Inner or System domain in CPU
|
|
* terms, depending on coherency).
|
|
*/
|
|
if (prot & IOMMU_CACHE && data->iop.fmt != ARM_MALI_LPAE)
|
|
pte |= ARM_LPAE_PTE_SH_IS;
|
|
else
|
|
pte |= ARM_LPAE_PTE_SH_OS;
|
|
|
|
if (prot & IOMMU_NOEXEC)
|
|
pte |= ARM_LPAE_PTE_XN;
|
|
|
|
if (data->iop.cfg.quirks & IO_PGTABLE_QUIRK_ARM_NS)
|
|
pte |= ARM_LPAE_PTE_NS;
|
|
|
|
if (data->iop.fmt != ARM_MALI_LPAE)
|
|
pte |= ARM_LPAE_PTE_AF;
|
|
|
|
return pte;
|
|
}
|
|
|
|
static int arm_lpae_map_pages(struct io_pgtable_ops *ops, unsigned long iova,
|
|
phys_addr_t paddr, size_t pgsize, size_t pgcount,
|
|
int iommu_prot, gfp_t gfp, size_t *mapped)
|
|
{
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
|
arm_lpae_iopte *ptep = data->pgd;
|
|
int ret, lvl = data->start_level;
|
|
arm_lpae_iopte prot;
|
|
long iaext = (s64)iova >> cfg->ias;
|
|
|
|
if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize))
|
|
return -EINVAL;
|
|
|
|
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
|
|
iaext = ~iaext;
|
|
if (WARN_ON(iaext || paddr >> cfg->oas))
|
|
return -ERANGE;
|
|
|
|
/* If no access, then nothing to do */
|
|
if (!(iommu_prot & (IOMMU_READ | IOMMU_WRITE)))
|
|
return 0;
|
|
|
|
prot = arm_lpae_prot_to_pte(data, iommu_prot);
|
|
ret = __arm_lpae_map(data, iova, paddr, pgsize, pgcount, prot, lvl,
|
|
ptep, gfp, mapped);
|
|
/*
|
|
* 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.
|
|
*/
|
|
wmb();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int arm_lpae_map(struct io_pgtable_ops *ops, unsigned long iova,
|
|
phys_addr_t paddr, size_t size, int iommu_prot, gfp_t gfp)
|
|
{
|
|
return arm_lpae_map_pages(ops, iova, paddr, size, 1, iommu_prot, gfp,
|
|
NULL);
|
|
}
|
|
|
|
static void __arm_lpae_free_pgtable(struct arm_lpae_io_pgtable *data, int lvl,
|
|
arm_lpae_iopte *ptep)
|
|
{
|
|
arm_lpae_iopte *start, *end;
|
|
unsigned long table_size;
|
|
|
|
if (lvl == data->start_level)
|
|
table_size = ARM_LPAE_PGD_SIZE(data);
|
|
else
|
|
table_size = ARM_LPAE_GRANULE(data);
|
|
|
|
start = ptep;
|
|
|
|
/* Only leaf entries at the last level */
|
|
if (lvl == ARM_LPAE_MAX_LEVELS - 1)
|
|
end = ptep;
|
|
else
|
|
end = (void *)ptep + table_size;
|
|
|
|
while (ptep != end) {
|
|
arm_lpae_iopte pte = *ptep++;
|
|
|
|
if (!pte || iopte_leaf(pte, lvl, data->iop.fmt))
|
|
continue;
|
|
|
|
__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
|
|
}
|
|
|
|
__arm_lpae_free_pages(start, table_size, &data->iop.cfg);
|
|
}
|
|
|
|
static void arm_lpae_free_pgtable(struct io_pgtable *iop)
|
|
{
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_to_data(iop);
|
|
|
|
__arm_lpae_free_pgtable(data, data->start_level, data->pgd);
|
|
kfree(data);
|
|
}
|
|
|
|
static size_t arm_lpae_split_blk_unmap(struct arm_lpae_io_pgtable *data,
|
|
struct iommu_iotlb_gather *gather,
|
|
unsigned long iova, size_t size,
|
|
arm_lpae_iopte blk_pte, int lvl,
|
|
arm_lpae_iopte *ptep, size_t pgcount)
|
|
{
|
|
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
|
arm_lpae_iopte pte, *tablep;
|
|
phys_addr_t blk_paddr;
|
|
size_t tablesz = ARM_LPAE_GRANULE(data);
|
|
size_t split_sz = ARM_LPAE_BLOCK_SIZE(lvl, data);
|
|
int ptes_per_table = ARM_LPAE_PTES_PER_TABLE(data);
|
|
int i, unmap_idx_start = -1, num_entries = 0, max_entries;
|
|
|
|
if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
|
|
return 0;
|
|
|
|
tablep = __arm_lpae_alloc_pages(tablesz, GFP_ATOMIC, cfg);
|
|
if (!tablep)
|
|
return 0; /* Bytes unmapped */
|
|
|
|
if (size == split_sz) {
|
|
unmap_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
|
|
max_entries = ptes_per_table - unmap_idx_start;
|
|
num_entries = min_t(int, pgcount, max_entries);
|
|
}
|
|
|
|
blk_paddr = iopte_to_paddr(blk_pte, data);
|
|
pte = iopte_prot(blk_pte);
|
|
|
|
for (i = 0; i < ptes_per_table; i++, blk_paddr += split_sz) {
|
|
/* Unmap! */
|
|
if (i >= unmap_idx_start && i < (unmap_idx_start + num_entries))
|
|
continue;
|
|
|
|
__arm_lpae_init_pte(data, blk_paddr, pte, lvl, 1, &tablep[i]);
|
|
}
|
|
|
|
pte = arm_lpae_install_table(tablep, ptep, blk_pte, data);
|
|
if (pte != blk_pte) {
|
|
__arm_lpae_free_pages(tablep, tablesz, cfg);
|
|
/*
|
|
* We may race against someone unmapping another part of this
|
|
* block, but anything else is invalid. We can't misinterpret
|
|
* a page entry here since we're never at the last level.
|
|
*/
|
|
if (iopte_type(pte) != ARM_LPAE_PTE_TYPE_TABLE)
|
|
return 0;
|
|
|
|
tablep = iopte_deref(pte, data);
|
|
} else if (unmap_idx_start >= 0) {
|
|
for (i = 0; i < num_entries; i++)
|
|
io_pgtable_tlb_add_page(&data->iop, gather, iova + i * size, size);
|
|
|
|
return num_entries * size;
|
|
}
|
|
|
|
return __arm_lpae_unmap(data, gather, iova, size, pgcount, lvl, tablep);
|
|
}
|
|
|
|
static size_t __arm_lpae_unmap(struct arm_lpae_io_pgtable *data,
|
|
struct iommu_iotlb_gather *gather,
|
|
unsigned long iova, size_t size, size_t pgcount,
|
|
int lvl, arm_lpae_iopte *ptep)
|
|
{
|
|
arm_lpae_iopte pte;
|
|
struct io_pgtable *iop = &data->iop;
|
|
int i = 0, num_entries, max_entries, unmap_idx_start;
|
|
|
|
/* Something went horribly wrong and we ran out of page table */
|
|
if (WARN_ON(lvl == ARM_LPAE_MAX_LEVELS))
|
|
return 0;
|
|
|
|
unmap_idx_start = ARM_LPAE_LVL_IDX(iova, lvl, data);
|
|
ptep += unmap_idx_start;
|
|
pte = READ_ONCE(*ptep);
|
|
if (WARN_ON(!pte))
|
|
return 0;
|
|
|
|
/* If the size matches this level, we're in the right place */
|
|
if (size == ARM_LPAE_BLOCK_SIZE(lvl, data)) {
|
|
max_entries = ARM_LPAE_PTES_PER_TABLE(data) - unmap_idx_start;
|
|
num_entries = min_t(int, pgcount, max_entries);
|
|
|
|
while (i < num_entries) {
|
|
pte = READ_ONCE(*ptep);
|
|
if (WARN_ON(!pte))
|
|
break;
|
|
|
|
__arm_lpae_clear_pte(ptep, &iop->cfg);
|
|
|
|
if (!iopte_leaf(pte, lvl, iop->fmt)) {
|
|
/* Also flush any partial walks */
|
|
io_pgtable_tlb_flush_walk(iop, iova + i * size, size,
|
|
ARM_LPAE_GRANULE(data));
|
|
__arm_lpae_free_pgtable(data, lvl + 1, iopte_deref(pte, data));
|
|
} else if (!iommu_iotlb_gather_queued(gather)) {
|
|
io_pgtable_tlb_add_page(iop, gather, iova + i * size, size);
|
|
}
|
|
|
|
ptep++;
|
|
i++;
|
|
}
|
|
|
|
return i * size;
|
|
} else if (iopte_leaf(pte, lvl, iop->fmt)) {
|
|
/*
|
|
* Insert a table at the next level to map the old region,
|
|
* minus the part we want to unmap
|
|
*/
|
|
return arm_lpae_split_blk_unmap(data, gather, iova, size, pte,
|
|
lvl + 1, ptep, pgcount);
|
|
}
|
|
|
|
/* Keep on walkin' */
|
|
ptep = iopte_deref(pte, data);
|
|
return __arm_lpae_unmap(data, gather, iova, size, pgcount, lvl + 1, ptep);
|
|
}
|
|
|
|
static size_t arm_lpae_unmap_pages(struct io_pgtable_ops *ops, unsigned long iova,
|
|
size_t pgsize, size_t pgcount,
|
|
struct iommu_iotlb_gather *gather)
|
|
{
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
|
arm_lpae_iopte *ptep = data->pgd;
|
|
long iaext = (s64)iova >> cfg->ias;
|
|
|
|
if (WARN_ON(!pgsize || (pgsize & cfg->pgsize_bitmap) != pgsize || !pgcount))
|
|
return 0;
|
|
|
|
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1)
|
|
iaext = ~iaext;
|
|
if (WARN_ON(iaext))
|
|
return 0;
|
|
|
|
return __arm_lpae_unmap(data, gather, iova, pgsize, pgcount,
|
|
data->start_level, ptep);
|
|
}
|
|
|
|
static size_t arm_lpae_unmap(struct io_pgtable_ops *ops, unsigned long iova,
|
|
size_t size, struct iommu_iotlb_gather *gather)
|
|
{
|
|
return arm_lpae_unmap_pages(ops, iova, size, 1, gather);
|
|
}
|
|
|
|
static phys_addr_t arm_lpae_iova_to_phys(struct io_pgtable_ops *ops,
|
|
unsigned long iova)
|
|
{
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
arm_lpae_iopte pte, *ptep = data->pgd;
|
|
int lvl = data->start_level;
|
|
|
|
do {
|
|
/* Valid IOPTE pointer? */
|
|
if (!ptep)
|
|
return 0;
|
|
|
|
/* Grab the IOPTE we're interested in */
|
|
ptep += ARM_LPAE_LVL_IDX(iova, lvl, data);
|
|
pte = READ_ONCE(*ptep);
|
|
|
|
/* Valid entry? */
|
|
if (!pte)
|
|
return 0;
|
|
|
|
/* Leaf entry? */
|
|
if (iopte_leaf(pte, lvl, data->iop.fmt))
|
|
goto found_translation;
|
|
|
|
/* Take it to the next level */
|
|
ptep = iopte_deref(pte, data);
|
|
} while (++lvl < ARM_LPAE_MAX_LEVELS);
|
|
|
|
/* Ran out of page tables to walk */
|
|
return 0;
|
|
|
|
found_translation:
|
|
iova &= (ARM_LPAE_BLOCK_SIZE(lvl, data) - 1);
|
|
return iopte_to_paddr(pte, data) | iova;
|
|
}
|
|
|
|
static void arm_lpae_restrict_pgsizes(struct io_pgtable_cfg *cfg)
|
|
{
|
|
unsigned long granule, page_sizes;
|
|
unsigned int max_addr_bits = 48;
|
|
|
|
/*
|
|
* We need to restrict the supported page sizes to match the
|
|
* translation regime for a particular granule. Aim to match
|
|
* the CPU page size if possible, otherwise prefer smaller sizes.
|
|
* While we're at it, restrict the block sizes to match the
|
|
* chosen granule.
|
|
*/
|
|
if (cfg->pgsize_bitmap & PAGE_SIZE)
|
|
granule = PAGE_SIZE;
|
|
else if (cfg->pgsize_bitmap & ~PAGE_MASK)
|
|
granule = 1UL << __fls(cfg->pgsize_bitmap & ~PAGE_MASK);
|
|
else if (cfg->pgsize_bitmap & PAGE_MASK)
|
|
granule = 1UL << __ffs(cfg->pgsize_bitmap & PAGE_MASK);
|
|
else
|
|
granule = 0;
|
|
|
|
switch (granule) {
|
|
case SZ_4K:
|
|
page_sizes = (SZ_4K | SZ_2M | SZ_1G);
|
|
break;
|
|
case SZ_16K:
|
|
page_sizes = (SZ_16K | SZ_32M);
|
|
break;
|
|
case SZ_64K:
|
|
max_addr_bits = 52;
|
|
page_sizes = (SZ_64K | SZ_512M);
|
|
if (cfg->oas > 48)
|
|
page_sizes |= 1ULL << 42; /* 4TB */
|
|
break;
|
|
default:
|
|
page_sizes = 0;
|
|
}
|
|
|
|
cfg->pgsize_bitmap &= page_sizes;
|
|
cfg->ias = min(cfg->ias, max_addr_bits);
|
|
cfg->oas = min(cfg->oas, max_addr_bits);
|
|
}
|
|
|
|
static struct arm_lpae_io_pgtable *
|
|
arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg)
|
|
{
|
|
struct arm_lpae_io_pgtable *data;
|
|
int levels, va_bits, pg_shift;
|
|
|
|
arm_lpae_restrict_pgsizes(cfg);
|
|
|
|
if (!(cfg->pgsize_bitmap & (SZ_4K | SZ_16K | SZ_64K)))
|
|
return NULL;
|
|
|
|
if (cfg->ias > ARM_LPAE_MAX_ADDR_BITS)
|
|
return NULL;
|
|
|
|
if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS)
|
|
return NULL;
|
|
|
|
data = kmalloc(sizeof(*data), GFP_KERNEL);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
pg_shift = __ffs(cfg->pgsize_bitmap);
|
|
data->bits_per_level = pg_shift - ilog2(sizeof(arm_lpae_iopte));
|
|
|
|
va_bits = cfg->ias - pg_shift;
|
|
levels = DIV_ROUND_UP(va_bits, data->bits_per_level);
|
|
data->start_level = ARM_LPAE_MAX_LEVELS - levels;
|
|
|
|
/* Calculate the actual size of our pgd (without concatenation) */
|
|
data->pgd_bits = va_bits - (data->bits_per_level * (levels - 1));
|
|
|
|
data->iop.ops = (struct io_pgtable_ops) {
|
|
.map = arm_lpae_map,
|
|
.map_pages = arm_lpae_map_pages,
|
|
.unmap = arm_lpae_unmap,
|
|
.unmap_pages = arm_lpae_unmap_pages,
|
|
.iova_to_phys = arm_lpae_iova_to_phys,
|
|
};
|
|
|
|
return data;
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_64_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
u64 reg;
|
|
struct arm_lpae_io_pgtable *data;
|
|
typeof(&cfg->arm_lpae_s1_cfg.tcr) tcr = &cfg->arm_lpae_s1_cfg.tcr;
|
|
bool tg1;
|
|
|
|
if (cfg->quirks & ~(IO_PGTABLE_QUIRK_ARM_NS |
|
|
IO_PGTABLE_QUIRK_ARM_TTBR1 |
|
|
IO_PGTABLE_QUIRK_ARM_OUTER_WBWA))
|
|
return NULL;
|
|
|
|
data = arm_lpae_alloc_pgtable(cfg);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
/* TCR */
|
|
if (cfg->coherent_walk) {
|
|
tcr->sh = ARM_LPAE_TCR_SH_IS;
|
|
tcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
|
|
tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
|
|
if (cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA)
|
|
goto out_free_data;
|
|
} else {
|
|
tcr->sh = ARM_LPAE_TCR_SH_OS;
|
|
tcr->irgn = ARM_LPAE_TCR_RGN_NC;
|
|
if (!(cfg->quirks & IO_PGTABLE_QUIRK_ARM_OUTER_WBWA))
|
|
tcr->orgn = ARM_LPAE_TCR_RGN_NC;
|
|
else
|
|
tcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
|
|
}
|
|
|
|
tg1 = cfg->quirks & IO_PGTABLE_QUIRK_ARM_TTBR1;
|
|
switch (ARM_LPAE_GRANULE(data)) {
|
|
case SZ_4K:
|
|
tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_4K : ARM_LPAE_TCR_TG0_4K;
|
|
break;
|
|
case SZ_16K:
|
|
tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_16K : ARM_LPAE_TCR_TG0_16K;
|
|
break;
|
|
case SZ_64K:
|
|
tcr->tg = tg1 ? ARM_LPAE_TCR_TG1_64K : ARM_LPAE_TCR_TG0_64K;
|
|
break;
|
|
}
|
|
|
|
switch (cfg->oas) {
|
|
case 32:
|
|
tcr->ips = ARM_LPAE_TCR_PS_32_BIT;
|
|
break;
|
|
case 36:
|
|
tcr->ips = ARM_LPAE_TCR_PS_36_BIT;
|
|
break;
|
|
case 40:
|
|
tcr->ips = ARM_LPAE_TCR_PS_40_BIT;
|
|
break;
|
|
case 42:
|
|
tcr->ips = ARM_LPAE_TCR_PS_42_BIT;
|
|
break;
|
|
case 44:
|
|
tcr->ips = ARM_LPAE_TCR_PS_44_BIT;
|
|
break;
|
|
case 48:
|
|
tcr->ips = ARM_LPAE_TCR_PS_48_BIT;
|
|
break;
|
|
case 52:
|
|
tcr->ips = ARM_LPAE_TCR_PS_52_BIT;
|
|
break;
|
|
default:
|
|
goto out_free_data;
|
|
}
|
|
|
|
tcr->tsz = 64ULL - cfg->ias;
|
|
|
|
/* MAIRs */
|
|
reg = (ARM_LPAE_MAIR_ATTR_NC
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
|
|
(ARM_LPAE_MAIR_ATTR_WBRWA
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
|
|
(ARM_LPAE_MAIR_ATTR_DEVICE
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV)) |
|
|
(ARM_LPAE_MAIR_ATTR_INC_OWBRWA
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_INC_OCACHE));
|
|
|
|
cfg->arm_lpae_s1_cfg.mair = reg;
|
|
|
|
/* Looking good; allocate a pgd */
|
|
data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data),
|
|
GFP_KERNEL, cfg);
|
|
if (!data->pgd)
|
|
goto out_free_data;
|
|
|
|
/* Ensure the empty pgd is visible before any actual TTBR write */
|
|
wmb();
|
|
|
|
/* TTBR */
|
|
cfg->arm_lpae_s1_cfg.ttbr = virt_to_phys(data->pgd);
|
|
return &data->iop;
|
|
|
|
out_free_data:
|
|
kfree(data);
|
|
return NULL;
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_64_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
u64 sl;
|
|
struct arm_lpae_io_pgtable *data;
|
|
typeof(&cfg->arm_lpae_s2_cfg.vtcr) vtcr = &cfg->arm_lpae_s2_cfg.vtcr;
|
|
|
|
/* The NS quirk doesn't apply at stage 2 */
|
|
if (cfg->quirks)
|
|
return NULL;
|
|
|
|
data = arm_lpae_alloc_pgtable(cfg);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
/*
|
|
* Concatenate PGDs at level 1 if possible in order to reduce
|
|
* the depth of the stage-2 walk.
|
|
*/
|
|
if (data->start_level == 0) {
|
|
unsigned long pgd_pages;
|
|
|
|
pgd_pages = ARM_LPAE_PGD_SIZE(data) / sizeof(arm_lpae_iopte);
|
|
if (pgd_pages <= ARM_LPAE_S2_MAX_CONCAT_PAGES) {
|
|
data->pgd_bits += data->bits_per_level;
|
|
data->start_level++;
|
|
}
|
|
}
|
|
|
|
/* VTCR */
|
|
if (cfg->coherent_walk) {
|
|
vtcr->sh = ARM_LPAE_TCR_SH_IS;
|
|
vtcr->irgn = ARM_LPAE_TCR_RGN_WBWA;
|
|
vtcr->orgn = ARM_LPAE_TCR_RGN_WBWA;
|
|
} else {
|
|
vtcr->sh = ARM_LPAE_TCR_SH_OS;
|
|
vtcr->irgn = ARM_LPAE_TCR_RGN_NC;
|
|
vtcr->orgn = ARM_LPAE_TCR_RGN_NC;
|
|
}
|
|
|
|
sl = data->start_level;
|
|
|
|
switch (ARM_LPAE_GRANULE(data)) {
|
|
case SZ_4K:
|
|
vtcr->tg = ARM_LPAE_TCR_TG0_4K;
|
|
sl++; /* SL0 format is different for 4K granule size */
|
|
break;
|
|
case SZ_16K:
|
|
vtcr->tg = ARM_LPAE_TCR_TG0_16K;
|
|
break;
|
|
case SZ_64K:
|
|
vtcr->tg = ARM_LPAE_TCR_TG0_64K;
|
|
break;
|
|
}
|
|
|
|
switch (cfg->oas) {
|
|
case 32:
|
|
vtcr->ps = ARM_LPAE_TCR_PS_32_BIT;
|
|
break;
|
|
case 36:
|
|
vtcr->ps = ARM_LPAE_TCR_PS_36_BIT;
|
|
break;
|
|
case 40:
|
|
vtcr->ps = ARM_LPAE_TCR_PS_40_BIT;
|
|
break;
|
|
case 42:
|
|
vtcr->ps = ARM_LPAE_TCR_PS_42_BIT;
|
|
break;
|
|
case 44:
|
|
vtcr->ps = ARM_LPAE_TCR_PS_44_BIT;
|
|
break;
|
|
case 48:
|
|
vtcr->ps = ARM_LPAE_TCR_PS_48_BIT;
|
|
break;
|
|
case 52:
|
|
vtcr->ps = ARM_LPAE_TCR_PS_52_BIT;
|
|
break;
|
|
default:
|
|
goto out_free_data;
|
|
}
|
|
|
|
vtcr->tsz = 64ULL - cfg->ias;
|
|
vtcr->sl = ~sl & ARM_LPAE_VTCR_SL0_MASK;
|
|
|
|
/* Allocate pgd pages */
|
|
data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data),
|
|
GFP_KERNEL, cfg);
|
|
if (!data->pgd)
|
|
goto out_free_data;
|
|
|
|
/* Ensure the empty pgd is visible before any actual TTBR write */
|
|
wmb();
|
|
|
|
/* VTTBR */
|
|
cfg->arm_lpae_s2_cfg.vttbr = virt_to_phys(data->pgd);
|
|
return &data->iop;
|
|
|
|
out_free_data:
|
|
kfree(data);
|
|
return NULL;
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_32_lpae_alloc_pgtable_s1(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
if (cfg->ias > 32 || cfg->oas > 40)
|
|
return NULL;
|
|
|
|
cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
|
|
return arm_64_lpae_alloc_pgtable_s1(cfg, cookie);
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_32_lpae_alloc_pgtable_s2(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
if (cfg->ias > 40 || cfg->oas > 40)
|
|
return NULL;
|
|
|
|
cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
|
|
return arm_64_lpae_alloc_pgtable_s2(cfg, cookie);
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
arm_mali_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
struct arm_lpae_io_pgtable *data;
|
|
|
|
/* No quirks for Mali (hopefully) */
|
|
if (cfg->quirks)
|
|
return NULL;
|
|
|
|
if (cfg->ias > 48 || cfg->oas > 40)
|
|
return NULL;
|
|
|
|
cfg->pgsize_bitmap &= (SZ_4K | SZ_2M | SZ_1G);
|
|
|
|
data = arm_lpae_alloc_pgtable(cfg);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
/* Mali seems to need a full 4-level table regardless of IAS */
|
|
if (data->start_level > 0) {
|
|
data->start_level = 0;
|
|
data->pgd_bits = 0;
|
|
}
|
|
/*
|
|
* MEMATTR: Mali has no actual notion of a non-cacheable type, so the
|
|
* best we can do is mimic the out-of-tree driver and hope that the
|
|
* "implementation-defined caching policy" is good enough. Similarly,
|
|
* we'll use it for the sake of a valid attribute for our 'device'
|
|
* index, although callers should never request that in practice.
|
|
*/
|
|
cfg->arm_mali_lpae_cfg.memattr =
|
|
(ARM_MALI_LPAE_MEMATTR_IMP_DEF
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_NC)) |
|
|
(ARM_MALI_LPAE_MEMATTR_WRITE_ALLOC
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_CACHE)) |
|
|
(ARM_MALI_LPAE_MEMATTR_IMP_DEF
|
|
<< ARM_LPAE_MAIR_ATTR_SHIFT(ARM_LPAE_MAIR_ATTR_IDX_DEV));
|
|
|
|
data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data), GFP_KERNEL,
|
|
cfg);
|
|
if (!data->pgd)
|
|
goto out_free_data;
|
|
|
|
/* Ensure the empty pgd is visible before TRANSTAB can be written */
|
|
wmb();
|
|
|
|
cfg->arm_mali_lpae_cfg.transtab = virt_to_phys(data->pgd) |
|
|
ARM_MALI_LPAE_TTBR_READ_INNER |
|
|
ARM_MALI_LPAE_TTBR_ADRMODE_TABLE;
|
|
if (cfg->coherent_walk)
|
|
cfg->arm_mali_lpae_cfg.transtab |= ARM_MALI_LPAE_TTBR_SHARE_OUTER;
|
|
|
|
return &data->iop;
|
|
|
|
out_free_data:
|
|
kfree(data);
|
|
return NULL;
|
|
}
|
|
|
|
static struct io_pgtable *
|
|
apple_dart_alloc_pgtable(struct io_pgtable_cfg *cfg, void *cookie)
|
|
{
|
|
struct arm_lpae_io_pgtable *data;
|
|
int i;
|
|
|
|
if (cfg->oas > 36)
|
|
return NULL;
|
|
|
|
data = arm_lpae_alloc_pgtable(cfg);
|
|
if (!data)
|
|
return NULL;
|
|
|
|
/*
|
|
* The table format itself always uses two levels, but the total VA
|
|
* space is mapped by four separate tables, making the MMIO registers
|
|
* an effective "level 1". For simplicity, though, we treat this
|
|
* equivalently to LPAE stage 2 concatenation at level 2, with the
|
|
* additional TTBRs each just pointing at consecutive pages.
|
|
*/
|
|
if (data->start_level < 1)
|
|
goto out_free_data;
|
|
if (data->start_level == 1 && data->pgd_bits > 2)
|
|
goto out_free_data;
|
|
if (data->start_level > 1)
|
|
data->pgd_bits = 0;
|
|
data->start_level = 2;
|
|
cfg->apple_dart_cfg.n_ttbrs = 1 << data->pgd_bits;
|
|
data->pgd_bits += data->bits_per_level;
|
|
|
|
data->pgd = __arm_lpae_alloc_pages(ARM_LPAE_PGD_SIZE(data), GFP_KERNEL,
|
|
cfg);
|
|
if (!data->pgd)
|
|
goto out_free_data;
|
|
|
|
for (i = 0; i < cfg->apple_dart_cfg.n_ttbrs; ++i)
|
|
cfg->apple_dart_cfg.ttbr[i] =
|
|
virt_to_phys(data->pgd + i * ARM_LPAE_GRANULE(data));
|
|
|
|
return &data->iop;
|
|
|
|
out_free_data:
|
|
kfree(data);
|
|
return NULL;
|
|
}
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s1_init_fns = {
|
|
.alloc = arm_64_lpae_alloc_pgtable_s1,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_64_lpae_s2_init_fns = {
|
|
.alloc = arm_64_lpae_alloc_pgtable_s2,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s1_init_fns = {
|
|
.alloc = arm_32_lpae_alloc_pgtable_s1,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_32_lpae_s2_init_fns = {
|
|
.alloc = arm_32_lpae_alloc_pgtable_s2,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
struct io_pgtable_init_fns io_pgtable_arm_mali_lpae_init_fns = {
|
|
.alloc = arm_mali_lpae_alloc_pgtable,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
struct io_pgtable_init_fns io_pgtable_apple_dart_init_fns = {
|
|
.alloc = apple_dart_alloc_pgtable,
|
|
.free = arm_lpae_free_pgtable,
|
|
};
|
|
|
|
#ifdef CONFIG_IOMMU_IO_PGTABLE_LPAE_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,
|
|
unsigned long iova, size_t granule,
|
|
void *cookie)
|
|
{
|
|
dummy_tlb_flush(iova, granule, granule, cookie);
|
|
}
|
|
|
|
static const struct iommu_flush_ops dummy_tlb_ops __initconst = {
|
|
.tlb_flush_all = dummy_tlb_flush_all,
|
|
.tlb_flush_walk = dummy_tlb_flush,
|
|
.tlb_add_page = dummy_tlb_add_page,
|
|
};
|
|
|
|
static void __init arm_lpae_dump_ops(struct io_pgtable_ops *ops)
|
|
{
|
|
struct arm_lpae_io_pgtable *data = io_pgtable_ops_to_data(ops);
|
|
struct io_pgtable_cfg *cfg = &data->iop.cfg;
|
|
|
|
pr_err("cfg: pgsize_bitmap 0x%lx, ias %u-bit\n",
|
|
cfg->pgsize_bitmap, cfg->ias);
|
|
pr_err("data: %d levels, 0x%zx pgd_size, %u pg_shift, %u bits_per_level, pgd @ %p\n",
|
|
ARM_LPAE_MAX_LEVELS - data->start_level, ARM_LPAE_PGD_SIZE(data),
|
|
ilog2(ARM_LPAE_GRANULE(data)), data->bits_per_level, data->pgd);
|
|
}
|
|
|
|
#define __FAIL(ops, i) ({ \
|
|
WARN(1, "selftest: test failed for fmt idx %d\n", (i)); \
|
|
arm_lpae_dump_ops(ops); \
|
|
selftest_running = false; \
|
|
-EFAULT; \
|
|
})
|
|
|
|
static int __init arm_lpae_run_tests(struct io_pgtable_cfg *cfg)
|
|
{
|
|
static const enum io_pgtable_fmt fmts[] __initconst = {
|
|
ARM_64_LPAE_S1,
|
|
ARM_64_LPAE_S2,
|
|
};
|
|
|
|
int i, j;
|
|
unsigned long iova;
|
|
size_t size;
|
|
struct io_pgtable_ops *ops;
|
|
|
|
selftest_running = true;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(fmts); ++i) {
|
|
cfg_cookie = cfg;
|
|
ops = alloc_io_pgtable_ops(fmts[i], cfg, cfg);
|
|
if (!ops) {
|
|
pr_err("selftest: failed to allocate io pgtable ops\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* Initial sanity checks.
|
|
* Empty page tables shouldn't provide any translations.
|
|
*/
|
|
if (ops->iova_to_phys(ops, 42))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, SZ_1G + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, SZ_2G + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
/*
|
|
* Distinct mappings of different granule sizes.
|
|
*/
|
|
iova = 0;
|
|
for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
|
|
size = 1UL << j;
|
|
|
|
if (ops->map(ops, iova, iova, size, IOMMU_READ |
|
|
IOMMU_WRITE |
|
|
IOMMU_NOEXEC |
|
|
IOMMU_CACHE, GFP_KERNEL))
|
|
return __FAIL(ops, i);
|
|
|
|
/* Overlapping mappings */
|
|
if (!ops->map(ops, iova, iova + size, size,
|
|
IOMMU_READ | IOMMU_NOEXEC, GFP_KERNEL))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
iova += SZ_1G;
|
|
}
|
|
|
|
/* Partial unmap */
|
|
size = 1UL << __ffs(cfg->pgsize_bitmap);
|
|
if (ops->unmap(ops, SZ_1G + size, size, NULL) != size)
|
|
return __FAIL(ops, i);
|
|
|
|
/* Remap of partial unmap */
|
|
if (ops->map(ops, SZ_1G + size, size, size, IOMMU_READ, GFP_KERNEL))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, SZ_1G + size + 42) != (size + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
/* Full unmap */
|
|
iova = 0;
|
|
for_each_set_bit(j, &cfg->pgsize_bitmap, BITS_PER_LONG) {
|
|
size = 1UL << j;
|
|
|
|
if (ops->unmap(ops, iova, size, NULL) != size)
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
/* Remap full block */
|
|
if (ops->map(ops, iova, iova, size, IOMMU_WRITE, GFP_KERNEL))
|
|
return __FAIL(ops, i);
|
|
|
|
if (ops->iova_to_phys(ops, iova + 42) != (iova + 42))
|
|
return __FAIL(ops, i);
|
|
|
|
iova += SZ_1G;
|
|
}
|
|
|
|
free_io_pgtable_ops(ops);
|
|
}
|
|
|
|
selftest_running = false;
|
|
return 0;
|
|
}
|
|
|
|
static int __init arm_lpae_do_selftests(void)
|
|
{
|
|
static const unsigned long pgsize[] __initconst = {
|
|
SZ_4K | SZ_2M | SZ_1G,
|
|
SZ_16K | SZ_32M,
|
|
SZ_64K | SZ_512M,
|
|
};
|
|
|
|
static const unsigned int ias[] __initconst = {
|
|
32, 36, 40, 42, 44, 48,
|
|
};
|
|
|
|
int i, j, pass = 0, fail = 0;
|
|
struct io_pgtable_cfg cfg = {
|
|
.tlb = &dummy_tlb_ops,
|
|
.oas = 48,
|
|
.coherent_walk = true,
|
|
};
|
|
|
|
for (i = 0; i < ARRAY_SIZE(pgsize); ++i) {
|
|
for (j = 0; j < ARRAY_SIZE(ias); ++j) {
|
|
cfg.pgsize_bitmap = pgsize[i];
|
|
cfg.ias = ias[j];
|
|
pr_info("selftest: pgsize_bitmap 0x%08lx, IAS %u\n",
|
|
pgsize[i], ias[j]);
|
|
if (arm_lpae_run_tests(&cfg))
|
|
fail++;
|
|
else
|
|
pass++;
|
|
}
|
|
}
|
|
|
|
pr_info("selftest: completed with %d PASS %d FAIL\n", pass, fail);
|
|
return fail ? -EFAULT : 0;
|
|
}
|
|
subsys_initcall(arm_lpae_do_selftests);
|
|
#endif
|