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5bb1cc0ff9
Currently, pmd_present() only checks for a non-zero value, returning
true even after pmd_mknotpresent() (which only clears the type bits).
This patch converts pmd_present() to using pte_present(), similar to the
other pmd_*() checks. As a side effect, it will return true for
PROT_NONE mappings, though they are not yet used by the kernel with
transparent huge pages.
For consistency, also change pmd_mknotpresent() to only clear the
PMD_SECT_VALID bit, even though the PMD_TABLE_BIT is already 0 for block
mappings (no functional change). The unused PMD_SECT_PROT_NONE
definition is removed as transparent huge pages use the pte page prot
values.
Fixes: 9c7e535fcc ("arm64: mm: Route pmd thp functions through pte equivalents")
Cc: <stable@vger.kernel.org> # 3.15+
Reviewed-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
233 lines
7.7 KiB
C
233 lines
7.7 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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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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#ifndef __ASM_PGTABLE_HWDEF_H
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#define __ASM_PGTABLE_HWDEF_H
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/*
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* Number of page-table levels required to address 'va_bits' wide
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* address, without section mapping. We resolve the top (va_bits - PAGE_SHIFT)
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* bits with (PAGE_SHIFT - 3) bits at each page table level. Hence:
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*
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* levels = DIV_ROUND_UP((va_bits - PAGE_SHIFT), (PAGE_SHIFT - 3))
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*
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* where DIV_ROUND_UP(n, d) => (((n) + (d) - 1) / (d))
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*
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* We cannot include linux/kernel.h which defines DIV_ROUND_UP here
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* due to build issues. So we open code DIV_ROUND_UP here:
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*
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* ((((va_bits) - PAGE_SHIFT) + (PAGE_SHIFT - 3) - 1) / (PAGE_SHIFT - 3))
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*
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* which gets simplified as :
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*/
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#define ARM64_HW_PGTABLE_LEVELS(va_bits) (((va_bits) - 4) / (PAGE_SHIFT - 3))
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/*
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* Size mapped by an entry at level n ( 0 <= n <= 3)
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* We map (PAGE_SHIFT - 3) at all translation levels and PAGE_SHIFT bits
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* in the final page. The maximum number of translation levels supported by
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* the architecture is 4. Hence, starting at at level n, we have further
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* ((4 - n) - 1) levels of translation excluding the offset within the page.
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* So, the total number of bits mapped by an entry at level n is :
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*
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* ((4 - n) - 1) * (PAGE_SHIFT - 3) + PAGE_SHIFT
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*
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* Rearranging it a bit we get :
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* (4 - n) * (PAGE_SHIFT - 3) + 3
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*/
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#define ARM64_HW_PGTABLE_LEVEL_SHIFT(n) ((PAGE_SHIFT - 3) * (4 - (n)) + 3)
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#define PTRS_PER_PTE (1 << (PAGE_SHIFT - 3))
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/*
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* PMD_SHIFT determines the size a level 2 page table entry can map.
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*/
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#if CONFIG_PGTABLE_LEVELS > 2
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#define PMD_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(2)
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#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
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#define PMD_MASK (~(PMD_SIZE-1))
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#define PTRS_PER_PMD PTRS_PER_PTE
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#endif
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/*
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* PUD_SHIFT determines the size a level 1 page table entry can map.
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*/
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#if CONFIG_PGTABLE_LEVELS > 3
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#define PUD_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(1)
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#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
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#define PUD_MASK (~(PUD_SIZE-1))
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#define PTRS_PER_PUD PTRS_PER_PTE
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#endif
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/*
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* PGDIR_SHIFT determines the size a top-level page table entry can map
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* (depending on the configuration, this level can be 0, 1 or 2).
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*/
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#define PGDIR_SHIFT ARM64_HW_PGTABLE_LEVEL_SHIFT(4 - CONFIG_PGTABLE_LEVELS)
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#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_SIZE-1))
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#define PTRS_PER_PGD (1 << (VA_BITS - PGDIR_SHIFT))
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/*
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* Section address mask and size definitions.
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*/
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#define SECTION_SHIFT PMD_SHIFT
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#define SECTION_SIZE (_AC(1, UL) << SECTION_SHIFT)
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#define SECTION_MASK (~(SECTION_SIZE-1))
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/*
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* Contiguous page definitions.
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*/
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#ifdef CONFIG_ARM64_64K_PAGES
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#define CONT_PTE_SHIFT 5
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#define CONT_PMD_SHIFT 5
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#elif defined(CONFIG_ARM64_16K_PAGES)
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#define CONT_PTE_SHIFT 7
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#define CONT_PMD_SHIFT 5
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#else
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#define CONT_PTE_SHIFT 4
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#define CONT_PMD_SHIFT 4
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#endif
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#define CONT_PTES (1 << CONT_PTE_SHIFT)
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#define CONT_PTE_SIZE (CONT_PTES * PAGE_SIZE)
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#define CONT_PTE_MASK (~(CONT_PTE_SIZE - 1))
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#define CONT_PMDS (1 << CONT_PMD_SHIFT)
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#define CONT_PMD_SIZE (CONT_PMDS * PMD_SIZE)
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#define CONT_PMD_MASK (~(CONT_PMD_SIZE - 1))
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/* the the numerical offset of the PTE within a range of CONT_PTES */
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#define CONT_RANGE_OFFSET(addr) (((addr)>>PAGE_SHIFT)&(CONT_PTES-1))
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/*
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* Hardware page table definitions.
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*
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* Level 1 descriptor (PUD).
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*/
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#define PUD_TYPE_TABLE (_AT(pudval_t, 3) << 0)
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#define PUD_TABLE_BIT (_AT(pgdval_t, 1) << 1)
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#define PUD_TYPE_MASK (_AT(pgdval_t, 3) << 0)
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#define PUD_TYPE_SECT (_AT(pgdval_t, 1) << 0)
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/*
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* Level 2 descriptor (PMD).
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*/
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#define PMD_TYPE_MASK (_AT(pmdval_t, 3) << 0)
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#define PMD_TYPE_FAULT (_AT(pmdval_t, 0) << 0)
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#define PMD_TYPE_TABLE (_AT(pmdval_t, 3) << 0)
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#define PMD_TYPE_SECT (_AT(pmdval_t, 1) << 0)
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#define PMD_TABLE_BIT (_AT(pmdval_t, 1) << 1)
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/*
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* Section
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*/
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#define PMD_SECT_VALID (_AT(pmdval_t, 1) << 0)
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#define PMD_SECT_USER (_AT(pmdval_t, 1) << 6) /* AP[1] */
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#define PMD_SECT_RDONLY (_AT(pmdval_t, 1) << 7) /* AP[2] */
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#define PMD_SECT_S (_AT(pmdval_t, 3) << 8)
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#define PMD_SECT_AF (_AT(pmdval_t, 1) << 10)
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#define PMD_SECT_NG (_AT(pmdval_t, 1) << 11)
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#define PMD_SECT_CONT (_AT(pmdval_t, 1) << 52)
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#define PMD_SECT_PXN (_AT(pmdval_t, 1) << 53)
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#define PMD_SECT_UXN (_AT(pmdval_t, 1) << 54)
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/*
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* AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
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*/
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#define PMD_ATTRINDX(t) (_AT(pmdval_t, (t)) << 2)
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#define PMD_ATTRINDX_MASK (_AT(pmdval_t, 7) << 2)
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/*
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* Level 3 descriptor (PTE).
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*/
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#define PTE_TYPE_MASK (_AT(pteval_t, 3) << 0)
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#define PTE_TYPE_FAULT (_AT(pteval_t, 0) << 0)
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#define PTE_TYPE_PAGE (_AT(pteval_t, 3) << 0)
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#define PTE_TABLE_BIT (_AT(pteval_t, 1) << 1)
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#define PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */
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#define PTE_RDONLY (_AT(pteval_t, 1) << 7) /* AP[2] */
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#define PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */
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#define PTE_AF (_AT(pteval_t, 1) << 10) /* Access Flag */
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#define PTE_NG (_AT(pteval_t, 1) << 11) /* nG */
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#define PTE_DBM (_AT(pteval_t, 1) << 51) /* Dirty Bit Management */
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#define PTE_CONT (_AT(pteval_t, 1) << 52) /* Contiguous range */
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#define PTE_PXN (_AT(pteval_t, 1) << 53) /* Privileged XN */
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#define PTE_UXN (_AT(pteval_t, 1) << 54) /* User XN */
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/*
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* AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
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*/
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#define PTE_ATTRINDX(t) (_AT(pteval_t, (t)) << 2)
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#define PTE_ATTRINDX_MASK (_AT(pteval_t, 7) << 2)
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/*
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* 2nd stage PTE definitions
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*/
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#define PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[2:1] */
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#define PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */
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#define PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[2:1] */
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#define PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */
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/*
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* Memory Attribute override for Stage-2 (MemAttr[3:0])
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*/
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#define PTE_S2_MEMATTR(t) (_AT(pteval_t, (t)) << 2)
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#define PTE_S2_MEMATTR_MASK (_AT(pteval_t, 0xf) << 2)
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/*
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* EL2/HYP PTE/PMD definitions
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*/
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#define PMD_HYP PMD_SECT_USER
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#define PTE_HYP PTE_USER
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/*
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* Highest possible physical address supported.
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*/
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#define PHYS_MASK_SHIFT (48)
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#define PHYS_MASK ((UL(1) << PHYS_MASK_SHIFT) - 1)
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/*
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* TCR flags.
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*/
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#define TCR_T0SZ_OFFSET 0
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#define TCR_T1SZ_OFFSET 16
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#define TCR_T0SZ(x) ((UL(64) - (x)) << TCR_T0SZ_OFFSET)
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#define TCR_T1SZ(x) ((UL(64) - (x)) << TCR_T1SZ_OFFSET)
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#define TCR_TxSZ(x) (TCR_T0SZ(x) | TCR_T1SZ(x))
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#define TCR_TxSZ_WIDTH 6
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#define TCR_IRGN_NC ((UL(0) << 8) | (UL(0) << 24))
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#define TCR_IRGN_WBWA ((UL(1) << 8) | (UL(1) << 24))
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#define TCR_IRGN_WT ((UL(2) << 8) | (UL(2) << 24))
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#define TCR_IRGN_WBnWA ((UL(3) << 8) | (UL(3) << 24))
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#define TCR_IRGN_MASK ((UL(3) << 8) | (UL(3) << 24))
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#define TCR_ORGN_NC ((UL(0) << 10) | (UL(0) << 26))
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#define TCR_ORGN_WBWA ((UL(1) << 10) | (UL(1) << 26))
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#define TCR_ORGN_WT ((UL(2) << 10) | (UL(2) << 26))
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#define TCR_ORGN_WBnWA ((UL(3) << 10) | (UL(3) << 26))
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#define TCR_ORGN_MASK ((UL(3) << 10) | (UL(3) << 26))
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#define TCR_SHARED ((UL(3) << 12) | (UL(3) << 28))
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#define TCR_TG0_4K (UL(0) << 14)
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#define TCR_TG0_64K (UL(1) << 14)
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#define TCR_TG0_16K (UL(2) << 14)
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#define TCR_TG1_16K (UL(1) << 30)
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#define TCR_TG1_4K (UL(2) << 30)
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#define TCR_TG1_64K (UL(3) << 30)
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#define TCR_ASID16 (UL(1) << 36)
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#define TCR_TBI0 (UL(1) << 37)
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#define TCR_HA (UL(1) << 39)
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#define TCR_HD (UL(1) << 40)
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#endif
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