2012-03-05 11:49:27 +00:00
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/*
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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_H
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#define __ASM_PGTABLE_H
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2015-07-10 16:24:28 +00:00
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#include <asm/bug.h>
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2012-03-05 11:49:27 +00:00
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#include <asm/proc-fns.h>
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#include <asm/memory.h>
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#include <asm/pgtable-hwdef.h>
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arm64: Remove fixmap include fragility
The asm-generic fixmap.h depends on each architecture's fixmap.h to pull
in the definition of PAGE_KERNEL_RO, if this exists. In the absence of
this, FIXMAP_PAGE_RO will not be defined. In mm/early_ioremap.c the
definition of early_memremap_ro is predicated on FIXMAP_PAGE_RO being
defined.
Currently, the arm64 fixmap.h doesn't include pgtable.h for the
definition of PAGE_KERNEL_RO, and as a knock-on effect early_memremap_ro
is not always defined, leading to link-time failures when it is used.
This has been observed with defconfig on next-20160226.
Unfortunately, as pgtable.h includes fixmap.h, adding the include
introduces a circular dependency, which is just as fragile.
Instead, this patch factors out PAGE_KERNEL_RO and other prot
definitions into a new pgtable-prot header which can be included by poth
pgtable.h and fixmap.h, avoiding the circular dependency, and ensuring
that early_memremap_ro is alwyas defined where it is used.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-02-26 14:31:32 +00:00
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#include <asm/pgtable-prot.h>
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2012-03-05 11:49:27 +00:00
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/*
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2016-03-30 14:46:00 +00:00
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* VMALLOC range.
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2014-07-16 16:42:43 +00:00
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*
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2016-02-16 12:52:40 +00:00
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* VMALLOC_START: beginning of the kernel vmalloc space
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2016-03-30 14:46:00 +00:00
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* VMALLOC_END: extends to the available space below vmmemmap, PCI I/O space
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* and fixed mappings
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2012-03-05 11:49:27 +00:00
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*/
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2016-02-16 12:52:40 +00:00
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#define VMALLOC_START (MODULES_END)
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2014-07-16 16:42:43 +00:00
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#define VMALLOC_END (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
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2012-03-05 11:49:27 +00:00
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2016-03-30 12:25:48 +00:00
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#define vmemmap ((struct page *)VMEMMAP_START - (memstart_addr >> PAGE_SHIFT))
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2012-03-05 11:49:27 +00:00
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2015-02-11 23:26:41 +00:00
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#define FIRST_USER_ADDRESS 0UL
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2012-03-05 11:49:27 +00:00
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#ifndef __ASSEMBLY__
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2015-07-10 16:24:28 +00:00
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2017-06-26 13:27:36 +00:00
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#include <asm/cmpxchg.h>
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2016-01-25 11:45:07 +00:00
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#include <asm/fixmap.h>
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2015-07-10 16:24:28 +00:00
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#include <linux/mmdebug.h>
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2017-12-12 10:48:54 +00:00
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#include <linux/mm_types.h>
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#include <linux/sched.h>
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2015-07-10 16:24:28 +00:00
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2012-03-05 11:49:27 +00:00
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extern void __pte_error(const char *file, int line, unsigned long val);
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extern void __pmd_error(const char *file, int line, unsigned long val);
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2014-05-12 09:40:51 +00:00
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extern void __pud_error(const char *file, int line, unsigned long val);
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2012-03-05 11:49:27 +00:00
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extern void __pgd_error(const char *file, int line, unsigned long val);
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/*
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* ZERO_PAGE is a global shared page that is always zero: used
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* for zero-mapped memory areas etc..
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*/
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arm64: mm: place empty_zero_page in bss
Currently the zero page is set up in paging_init, and thus we cannot use
the zero page earlier. We use the zero page as a reserved TTBR value
from which no TLB entries may be allocated (e.g. when uninstalling the
idmap). To enable such usage earlier (as may be required for invasive
changes to the kernel page tables), and to minimise the time that the
idmap is active, we need to be able to use the zero page before
paging_init.
This patch follows the example set by x86, by allocating the zero page
at compile time, in .bss. This means that the zero page itself is
available immediately upon entry to start_kernel (as we zero .bss before
this), and also means that the zero page takes up no space in the raw
Image binary. The associated struct page is allocated in bootmem_init,
and remains unavailable until this time.
Outside of arch code, the only users of empty_zero_page assume that the
empty_zero_page symbol refers to the zeroed memory itself, and that
ZERO_PAGE(x) must be used to acquire the associated struct page,
following the example of x86. This patch also brings arm64 inline with
these assumptions.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Cc: Laura Abbott <labbott@fedoraproject.org>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-01-25 11:44:57 +00:00
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extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
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2017-01-10 21:35:49 +00:00
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#define ZERO_PAGE(vaddr) phys_to_page(__pa_symbol(empty_zero_page))
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2012-03-05 11:49:27 +00:00
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2014-07-21 13:52:49 +00:00
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#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
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2017-12-13 17:07:21 +00:00
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/*
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* Macros to convert between a physical address and its placement in a
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* page table entry, taking care of 52-bit addresses.
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*/
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#ifdef CONFIG_ARM64_PA_BITS_52
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#define __pte_to_phys(pte) \
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((pte_val(pte) & PTE_ADDR_LOW) | ((pte_val(pte) & PTE_ADDR_HIGH) << 36))
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#define __phys_to_pte_val(phys) (((phys) | ((phys) >> 36)) & PTE_ADDR_MASK)
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#else
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#define __pte_to_phys(pte) (pte_val(pte) & PTE_ADDR_MASK)
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#define __phys_to_pte_val(phys) (phys)
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#endif
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2012-03-05 11:49:27 +00:00
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2017-12-13 17:07:21 +00:00
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#define pte_pfn(pte) (__pte_to_phys(pte) >> PAGE_SHIFT)
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#define pfn_pte(pfn,prot) \
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__pte(__phys_to_pte_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
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2012-03-05 11:49:27 +00:00
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#define pte_none(pte) (!pte_val(pte))
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#define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
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#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
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2014-07-21 13:52:49 +00:00
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2012-03-05 11:49:27 +00:00
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/*
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* The following only work if pte_present(). Undefined behaviour otherwise.
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*/
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2014-02-25 11:38:53 +00:00
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#define pte_present(pte) (!!(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)))
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#define pte_young(pte) (!!(pte_val(pte) & PTE_AF))
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#define pte_special(pte) (!!(pte_val(pte) & PTE_SPECIAL))
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#define pte_write(pte) (!!(pte_val(pte) & PTE_WRITE))
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2017-01-27 10:54:12 +00:00
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#define pte_user_exec(pte) (!(pte_val(pte) & PTE_UXN))
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2015-10-07 17:00:21 +00:00
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#define pte_cont(pte) (!!(pte_val(pte) & PTE_CONT))
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2012-03-05 11:49:27 +00:00
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arm64: mm: set the contiguous bit for kernel mappings where appropriate
This is the third attempt at enabling the use of contiguous hints for
kernel mappings. The most recent attempt 0bfc445dec9d was reverted after
it turned out that updating permission attributes on live contiguous ranges
may result in TLB conflicts. So this time, the contiguous hint is not set
for .rodata or for the linear alias of .text/.rodata, both of which are
mapped read-write initially, and remapped read-only at a later stage.
(Note that the latter region could also be unmapped and remapped again
with updated permission attributes, given that the region, while live, is
only mapped for the convenience of the hibernation code, but that also
means the TLB footprint is negligible anyway, so why bother)
This enables the following contiguous range sizes for the virtual mapping
of the kernel image, and for the linear mapping:
granule size | cont PTE | cont PMD |
-------------+------------+------------+
4 KB | 64 KB | 32 MB |
16 KB | 2 MB | 1 GB* |
64 KB | 2 MB | 16 GB* |
* Only when built for 3 or more levels of translation. This is due to the
fact that a 2 level configuration only consists of PGDs and PTEs, and the
added complexity of dealing with folded PMDs is not justified considering
that 16 GB contiguous ranges are likely to be ignored by the hardware (and
16k/2 levels is a niche configuration)
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2017-03-09 20:52:09 +00:00
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#define pte_cont_addr_end(addr, end) \
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({ unsigned long __boundary = ((addr) + CONT_PTE_SIZE) & CONT_PTE_MASK; \
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(__boundary - 1 < (end) - 1) ? __boundary : (end); \
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})
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#define pmd_cont_addr_end(addr, end) \
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({ unsigned long __boundary = ((addr) + CONT_PMD_SIZE) & CONT_PMD_MASK; \
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(__boundary - 1 < (end) - 1) ? __boundary : (end); \
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})
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2015-09-11 17:22:00 +00:00
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#define pte_hw_dirty(pte) (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY))
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2015-07-10 16:24:28 +00:00
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#define pte_sw_dirty(pte) (!!(pte_val(pte) & PTE_DIRTY))
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#define pte_dirty(pte) (pte_sw_dirty(pte) || pte_hw_dirty(pte))
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2015-07-28 15:14:03 +00:00
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#define pte_valid(pte) (!!(pte_val(pte) & PTE_VALID))
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2017-01-27 10:54:12 +00:00
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/*
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* Execute-only user mappings do not have the PTE_USER bit set. All valid
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* kernel mappings have the PTE_UXN bit set.
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*/
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#define pte_valid_not_user(pte) \
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((pte_val(pte) & (PTE_VALID | PTE_USER | PTE_UXN)) == (PTE_VALID | PTE_UXN))
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2015-10-30 18:56:19 +00:00
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#define pte_valid_young(pte) \
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((pte_val(pte) & (PTE_VALID | PTE_AF)) == (PTE_VALID | PTE_AF))
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2017-10-26 17:36:47 +00:00
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#define pte_valid_user(pte) \
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((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))
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2015-10-30 18:56:19 +00:00
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/*
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* Could the pte be present in the TLB? We must check mm_tlb_flush_pending
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* so that we don't erroneously return false for pages that have been
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* remapped as PROT_NONE but are yet to be flushed from the TLB.
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*/
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#define pte_accessible(mm, pte) \
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(mm_tlb_flush_pending(mm) ? pte_present(pte) : pte_valid_young(pte))
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2012-03-05 11:49:27 +00:00
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2017-10-26 17:36:47 +00:00
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/*
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* p??_access_permitted() is true for valid user mappings (subject to the
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* write permission check) other than user execute-only which do not have the
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* PTE_USER bit set. PROT_NONE mappings do not have the PTE_VALID bit set.
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*/
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#define pte_access_permitted(pte, write) \
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(pte_valid_user(pte) && (!(write) || pte_write(pte)))
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#define pmd_access_permitted(pmd, write) \
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(pte_access_permitted(pmd_pte(pmd), (write)))
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#define pud_access_permitted(pud, write) \
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(pte_access_permitted(pud_pte(pud), (write)))
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2014-08-19 19:41:42 +00:00
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static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
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2014-01-15 14:07:12 +00:00
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{
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2014-08-19 19:41:42 +00:00
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pte_val(pte) &= ~pgprot_val(prot);
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2014-01-15 14:07:12 +00:00
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return pte;
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}
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2014-08-19 19:41:42 +00:00
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static inline pte_t set_pte_bit(pte_t pte, pgprot_t prot)
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2014-01-15 14:07:12 +00:00
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{
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2014-08-19 19:41:42 +00:00
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pte_val(pte) |= pgprot_val(prot);
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2014-01-15 14:07:12 +00:00
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return pte;
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}
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2014-08-19 19:41:42 +00:00
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static inline pte_t pte_wrprotect(pte_t pte)
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{
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2017-07-04 18:04:18 +00:00
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pte = clear_pte_bit(pte, __pgprot(PTE_WRITE));
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pte = set_pte_bit(pte, __pgprot(PTE_RDONLY));
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return pte;
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2014-08-19 19:41:42 +00:00
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}
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static inline pte_t pte_mkwrite(pte_t pte)
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{
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2017-07-04 18:04:18 +00:00
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pte = set_pte_bit(pte, __pgprot(PTE_WRITE));
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pte = clear_pte_bit(pte, __pgprot(PTE_RDONLY));
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return pte;
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2014-08-19 19:41:42 +00:00
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}
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2014-01-15 14:07:12 +00:00
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static inline pte_t pte_mkclean(pte_t pte)
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{
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2017-12-01 17:22:14 +00:00
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pte = clear_pte_bit(pte, __pgprot(PTE_DIRTY));
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pte = set_pte_bit(pte, __pgprot(PTE_RDONLY));
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return pte;
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2014-01-15 14:07:12 +00:00
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}
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static inline pte_t pte_mkdirty(pte_t pte)
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{
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2017-12-01 17:22:14 +00:00
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pte = set_pte_bit(pte, __pgprot(PTE_DIRTY));
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if (pte_write(pte))
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pte = clear_pte_bit(pte, __pgprot(PTE_RDONLY));
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return pte;
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2014-01-15 14:07:12 +00:00
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}
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static inline pte_t pte_mkold(pte_t pte)
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{
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2014-08-19 19:41:42 +00:00
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return clear_pte_bit(pte, __pgprot(PTE_AF));
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2014-01-15 14:07:12 +00:00
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}
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static inline pte_t pte_mkyoung(pte_t pte)
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{
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2014-08-19 19:41:42 +00:00
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return set_pte_bit(pte, __pgprot(PTE_AF));
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2014-01-15 14:07:12 +00:00
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}
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static inline pte_t pte_mkspecial(pte_t pte)
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{
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2014-08-19 19:41:42 +00:00
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return set_pte_bit(pte, __pgprot(PTE_SPECIAL));
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2014-01-15 14:07:12 +00:00
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}
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2012-03-05 11:49:27 +00:00
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2015-10-07 17:00:21 +00:00
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static inline pte_t pte_mkcont(pte_t pte)
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{
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2015-12-17 19:31:26 +00:00
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pte = set_pte_bit(pte, __pgprot(PTE_CONT));
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return set_pte_bit(pte, __pgprot(PTE_TYPE_PAGE));
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2015-10-07 17:00:21 +00:00
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}
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static inline pte_t pte_mknoncont(pte_t pte)
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{
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return clear_pte_bit(pte, __pgprot(PTE_CONT));
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}
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2016-08-24 17:27:30 +00:00
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static inline pte_t pte_mkpresent(pte_t pte)
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{
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return set_pte_bit(pte, __pgprot(PTE_VALID));
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}
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2015-12-17 19:31:26 +00:00
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static inline pmd_t pmd_mkcont(pmd_t pmd)
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{
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return __pmd(pmd_val(pmd) | PMD_SECT_CONT);
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}
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2012-03-05 11:49:27 +00:00
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static inline void set_pte(pte_t *ptep, pte_t pte)
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{
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2018-02-15 11:14:56 +00:00
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WRITE_ONCE(*ptep, pte);
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2014-06-09 10:55:03 +00:00
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/*
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* Only if the new pte is valid and kernel, otherwise TLB maintenance
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* or update_mmu_cache() have the necessary barriers.
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|
|
|
*/
|
2017-01-27 10:54:12 +00:00
|
|
|
if (pte_valid_not_user(pte)) {
|
2014-06-09 10:55:03 +00:00
|
|
|
dsb(ishst);
|
|
|
|
isb();
|
|
|
|
}
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
|
|
|
|
|
2015-07-10 16:24:28 +00:00
|
|
|
/*
|
|
|
|
* PTE bits configuration in the presence of hardware Dirty Bit Management
|
|
|
|
* (PTE_WRITE == PTE_DBM):
|
|
|
|
*
|
|
|
|
* Dirty Writable | PTE_RDONLY PTE_WRITE PTE_DIRTY (sw)
|
|
|
|
* 0 0 | 1 0 0
|
|
|
|
* 0 1 | 1 1 0
|
|
|
|
* 1 0 | 1 0 1
|
|
|
|
* 1 1 | 0 1 x
|
|
|
|
*
|
|
|
|
* When hardware DBM is not present, the sofware PTE_DIRTY bit is updated via
|
|
|
|
* the page fault mechanism. Checking the dirty status of a pte becomes:
|
|
|
|
*
|
2015-09-11 17:22:00 +00:00
|
|
|
* PTE_DIRTY || (PTE_WRITE && !PTE_RDONLY)
|
2015-07-10 16:24:28 +00:00
|
|
|
*/
|
2012-03-05 11:49:27 +00:00
|
|
|
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
|
|
|
|
pte_t *ptep, pte_t pte)
|
|
|
|
{
|
2018-02-15 11:14:56 +00:00
|
|
|
pte_t old_pte;
|
|
|
|
|
2017-07-04 18:04:18 +00:00
|
|
|
if (pte_present(pte) && pte_user_exec(pte) && !pte_special(pte))
|
|
|
|
__sync_icache_dcache(pte, addr);
|
2013-01-09 11:08:10 +00:00
|
|
|
|
2015-07-10 16:24:28 +00:00
|
|
|
/*
|
|
|
|
* If the existing pte is valid, check for potential race with
|
|
|
|
* hardware updates of the pte (ptep_set_access_flags safely changes
|
|
|
|
* valid ptes without going through an invalid entry).
|
|
|
|
*/
|
2018-02-15 11:14:56 +00:00
|
|
|
old_pte = READ_ONCE(*ptep);
|
|
|
|
if (IS_ENABLED(CONFIG_DEBUG_VM) && pte_valid(old_pte) && pte_valid(pte) &&
|
2017-12-12 10:48:54 +00:00
|
|
|
(mm == current->active_mm || atomic_read(&mm->mm_users) > 1)) {
|
2015-12-08 17:39:15 +00:00
|
|
|
VM_WARN_ONCE(!pte_young(pte),
|
|
|
|
"%s: racy access flag clearing: 0x%016llx -> 0x%016llx",
|
2018-02-15 11:14:56 +00:00
|
|
|
__func__, pte_val(old_pte), pte_val(pte));
|
|
|
|
VM_WARN_ONCE(pte_write(old_pte) && !pte_dirty(pte),
|
2015-12-08 17:39:15 +00:00
|
|
|
"%s: racy dirty state clearing: 0x%016llx -> 0x%016llx",
|
2018-02-15 11:14:56 +00:00
|
|
|
__func__, pte_val(old_pte), pte_val(pte));
|
2015-07-10 16:24:28 +00:00
|
|
|
}
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
set_pte(ptep, pte);
|
|
|
|
}
|
|
|
|
|
2016-08-03 14:15:55 +00:00
|
|
|
#define __HAVE_ARCH_PTE_SAME
|
|
|
|
static inline int pte_same(pte_t pte_a, pte_t pte_b)
|
|
|
|
{
|
|
|
|
pteval_t lhs, rhs;
|
|
|
|
|
|
|
|
lhs = pte_val(pte_a);
|
|
|
|
rhs = pte_val(pte_b);
|
|
|
|
|
|
|
|
if (pte_present(pte_a))
|
|
|
|
lhs &= ~PTE_RDONLY;
|
|
|
|
|
|
|
|
if (pte_present(pte_b))
|
|
|
|
rhs &= ~PTE_RDONLY;
|
|
|
|
|
|
|
|
return (lhs == rhs);
|
|
|
|
}
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
/*
|
|
|
|
* Huge pte definitions.
|
|
|
|
*/
|
2013-04-10 12:48:00 +00:00
|
|
|
#define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT))
|
|
|
|
#define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Hugetlb definitions.
|
|
|
|
*/
|
2015-12-17 19:31:26 +00:00
|
|
|
#define HUGE_MAX_HSTATE 4
|
2013-04-10 12:48:00 +00:00
|
|
|
#define HPAGE_SHIFT PMD_SHIFT
|
|
|
|
#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
|
|
|
|
#define HPAGE_MASK (~(HPAGE_SIZE - 1))
|
|
|
|
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
|
2012-03-05 11:49:27 +00:00
|
|
|
|
|
|
|
#define __HAVE_ARCH_PTE_SPECIAL
|
|
|
|
|
2017-12-13 17:07:21 +00:00
|
|
|
static inline pte_t pgd_pte(pgd_t pgd)
|
|
|
|
{
|
|
|
|
return __pte(pgd_val(pgd));
|
|
|
|
}
|
|
|
|
|
2014-10-09 22:29:25 +00:00
|
|
|
static inline pte_t pud_pte(pud_t pud)
|
|
|
|
{
|
|
|
|
return __pte(pud_val(pud));
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline pmd_t pud_pmd(pud_t pud)
|
|
|
|
{
|
|
|
|
return __pmd(pud_val(pud));
|
|
|
|
}
|
|
|
|
|
2014-02-25 10:02:13 +00:00
|
|
|
static inline pte_t pmd_pte(pmd_t pmd)
|
|
|
|
{
|
|
|
|
return __pte(pmd_val(pmd));
|
|
|
|
}
|
2013-04-19 15:23:57 +00:00
|
|
|
|
2014-02-25 10:02:13 +00:00
|
|
|
static inline pmd_t pte_pmd(pte_t pte)
|
|
|
|
{
|
|
|
|
return __pmd(pte_val(pte));
|
|
|
|
}
|
2013-04-19 15:23:57 +00:00
|
|
|
|
2014-10-20 13:42:07 +00:00
|
|
|
static inline pgprot_t mk_sect_prot(pgprot_t prot)
|
|
|
|
{
|
|
|
|
return __pgprot(pgprot_val(prot) & ~PTE_TABLE_BIT);
|
|
|
|
}
|
|
|
|
|
2016-04-08 22:50:28 +00:00
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
|
|
/*
|
|
|
|
* See the comment in include/asm-generic/pgtable.h
|
|
|
|
*/
|
|
|
|
static inline int pte_protnone(pte_t pte)
|
|
|
|
{
|
|
|
|
return (pte_val(pte) & (PTE_VALID | PTE_PROT_NONE)) == PTE_PROT_NONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int pmd_protnone(pmd_t pmd)
|
|
|
|
{
|
|
|
|
return pte_protnone(pmd_pte(pmd));
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2013-04-19 15:23:57 +00:00
|
|
|
/*
|
|
|
|
* THP definitions.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
|
|
#define pmd_trans_huge(pmd) (pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT))
|
2014-10-09 22:29:25 +00:00
|
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
2013-04-19 15:23:57 +00:00
|
|
|
|
2016-05-05 09:44:02 +00:00
|
|
|
#define pmd_present(pmd) pte_present(pmd_pte(pmd))
|
2014-12-10 23:44:36 +00:00
|
|
|
#define pmd_dirty(pmd) pte_dirty(pmd_pte(pmd))
|
2014-02-25 10:02:13 +00:00
|
|
|
#define pmd_young(pmd) pte_young(pmd_pte(pmd))
|
|
|
|
#define pmd_wrprotect(pmd) pte_pmd(pte_wrprotect(pmd_pte(pmd)))
|
|
|
|
#define pmd_mkold(pmd) pte_pmd(pte_mkold(pmd_pte(pmd)))
|
|
|
|
#define pmd_mkwrite(pmd) pte_pmd(pte_mkwrite(pmd_pte(pmd)))
|
2016-05-05 09:44:01 +00:00
|
|
|
#define pmd_mkclean(pmd) pte_pmd(pte_mkclean(pmd_pte(pmd)))
|
2014-02-25 10:02:13 +00:00
|
|
|
#define pmd_mkdirty(pmd) pte_pmd(pte_mkdirty(pmd_pte(pmd)))
|
|
|
|
#define pmd_mkyoung(pmd) pte_pmd(pte_mkyoung(pmd_pte(pmd)))
|
2016-05-05 09:44:02 +00:00
|
|
|
#define pmd_mknotpresent(pmd) (__pmd(pmd_val(pmd) & ~PMD_SECT_VALID))
|
2013-04-19 15:23:57 +00:00
|
|
|
|
2016-03-15 10:46:34 +00:00
|
|
|
#define pmd_thp_or_huge(pmd) (pmd_huge(pmd) || pmd_trans_huge(pmd))
|
|
|
|
|
2014-02-25 10:02:13 +00:00
|
|
|
#define pmd_write(pmd) pte_write(pmd_pte(pmd))
|
2013-04-19 15:23:57 +00:00
|
|
|
|
|
|
|
#define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
|
|
|
|
|
2017-12-13 17:07:21 +00:00
|
|
|
#define __pmd_to_phys(pmd) __pte_to_phys(pmd_pte(pmd))
|
|
|
|
#define __phys_to_pmd_val(phys) __phys_to_pte_val(phys)
|
|
|
|
#define pmd_pfn(pmd) ((__pmd_to_phys(pmd) & PMD_MASK) >> PAGE_SHIFT)
|
|
|
|
#define pfn_pmd(pfn,prot) __pmd(__phys_to_pmd_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
2013-04-19 15:23:57 +00:00
|
|
|
#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot)
|
|
|
|
|
2014-10-09 22:29:25 +00:00
|
|
|
#define pud_write(pud) pte_write(pud_pte(pud))
|
2017-12-13 17:07:21 +00:00
|
|
|
|
|
|
|
#define __pud_to_phys(pud) __pte_to_phys(pud_pte(pud))
|
|
|
|
#define __phys_to_pud_val(phys) __phys_to_pte_val(phys)
|
|
|
|
#define pud_pfn(pud) ((__pud_to_phys(pud) & PUD_MASK) >> PAGE_SHIFT)
|
|
|
|
#define pfn_pud(pfn,prot) __pud(__phys_to_pud_val((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
|
2013-04-19 15:23:57 +00:00
|
|
|
|
arm64: mm: fix pmd_write CoW brokenness
Commit 9c7e535fcc17 ("arm64: mm: Route pmd thp functions through pte
equivalents") changed the pmd manipulator and accessor functions to
convert the target pmd to a pte, process it with the pte functions, then
convert it back. Along the way, we gained support for PTE_WRITE, however
this is completely ignored by set_pmd_at, and so we fail to set the
PMD_SECT_RDONLY for PMDs, resulting in all sorts of lovely failures (like
CoW not working).
Partially reverting the offending commit (by making use of
PMD_SECT_RDONLY explicitly for pmd_{write,wrprotect,mkwrite} functions)
leads to further issues because pmd_write can then return potentially
incorrect values for page table entries marked as RDONLY, leading to
BUG_ON(pmd_write(entry)) tripping under some THP workloads.
This patch fixes the issue by routing set_pmd_at through set_pte_at,
which correctly takes the PTE_WRITE flag into account. Given that
THP mappings are always anonymous, the additional cache-flushing code
in __sync_icache_dcache won't impose any significant overhead as the
flush will be skipped.
Cc: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Steve Capper <steve.capper@arm.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-05-27 18:11:58 +00:00
|
|
|
#define set_pmd_at(mm, addr, pmdp, pmd) set_pte_at(mm, addr, (pte_t *)pmdp, pmd_pte(pmd))
|
2013-04-19 15:23:57 +00:00
|
|
|
|
2017-12-13 17:07:21 +00:00
|
|
|
#define __pgd_to_phys(pgd) __pte_to_phys(pgd_pte(pgd))
|
|
|
|
#define __phys_to_pgd_val(phys) __phys_to_pte_val(phys)
|
|
|
|
|
2014-04-03 14:57:15 +00:00
|
|
|
#define __pgprot_modify(prot,mask,bits) \
|
|
|
|
__pgprot((pgprot_val(prot) & ~(mask)) | (bits))
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
/*
|
|
|
|
* Mark the prot value as uncacheable and unbufferable.
|
|
|
|
*/
|
|
|
|
#define pgprot_noncached(prot) \
|
2014-03-12 16:07:06 +00:00
|
|
|
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE) | PTE_PXN | PTE_UXN)
|
2012-03-05 11:49:27 +00:00
|
|
|
#define pgprot_writecombine(prot) \
|
2014-03-12 16:07:06 +00:00
|
|
|
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC) | PTE_PXN | PTE_UXN)
|
2014-09-29 14:29:31 +00:00
|
|
|
#define pgprot_device(prot) \
|
|
|
|
__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRE) | PTE_PXN | PTE_UXN)
|
2012-03-05 11:49:27 +00:00
|
|
|
#define __HAVE_PHYS_MEM_ACCESS_PROT
|
|
|
|
struct file;
|
|
|
|
extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
|
|
|
|
unsigned long size, pgprot_t vma_prot);
|
|
|
|
|
|
|
|
#define pmd_none(pmd) (!pmd_val(pmd))
|
|
|
|
|
2016-05-05 09:44:01 +00:00
|
|
|
#define pmd_bad(pmd) (!(pmd_val(pmd) & PMD_TABLE_BIT))
|
2012-03-05 11:49:27 +00:00
|
|
|
|
2012-12-07 18:35:41 +00:00
|
|
|
#define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
|
|
|
|
PMD_TYPE_TABLE)
|
|
|
|
#define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
|
|
|
|
PMD_TYPE_SECT)
|
|
|
|
|
2016-02-25 15:53:44 +00:00
|
|
|
#if defined(CONFIG_ARM64_64K_PAGES) || CONFIG_PGTABLE_LEVELS < 3
|
2014-05-06 13:02:27 +00:00
|
|
|
#define pud_sect(pud) (0)
|
2014-12-09 07:26:47 +00:00
|
|
|
#define pud_table(pud) (1)
|
2014-05-06 13:02:27 +00:00
|
|
|
#else
|
|
|
|
#define pud_sect(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \
|
|
|
|
PUD_TYPE_SECT)
|
2014-12-09 07:26:47 +00:00
|
|
|
#define pud_table(pud) ((pud_val(pud) & PUD_TYPE_MASK) == \
|
|
|
|
PUD_TYPE_TABLE)
|
2014-05-06 13:02:27 +00:00
|
|
|
#endif
|
2012-12-07 18:35:41 +00:00
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
|
|
|
|
{
|
2018-02-15 11:14:56 +00:00
|
|
|
WRITE_ONCE(*pmdp, pmd);
|
2014-05-02 15:24:10 +00:00
|
|
|
dsb(ishst);
|
2014-06-09 10:55:03 +00:00
|
|
|
isb();
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline void pmd_clear(pmd_t *pmdp)
|
|
|
|
{
|
|
|
|
set_pmd(pmdp, __pmd(0));
|
|
|
|
}
|
|
|
|
|
2016-01-25 11:45:04 +00:00
|
|
|
static inline phys_addr_t pmd_page_paddr(pmd_t pmd)
|
2012-03-05 11:49:27 +00:00
|
|
|
{
|
2017-12-13 17:07:21 +00:00
|
|
|
return __pmd_to_phys(pmd);
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
2016-01-25 11:45:03 +00:00
|
|
|
/* Find an entry in the third-level page table. */
|
|
|
|
#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
|
|
|
|
|
2017-09-29 10:29:55 +00:00
|
|
|
#define pte_offset_phys(dir,addr) (pmd_page_paddr(READ_ONCE(*(dir))) + pte_index(addr) * sizeof(pte_t))
|
2016-01-25 11:45:04 +00:00
|
|
|
#define pte_offset_kernel(dir,addr) ((pte_t *)__va(pte_offset_phys((dir), (addr))))
|
2016-01-25 11:45:03 +00:00
|
|
|
|
|
|
|
#define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
|
|
|
|
#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
|
|
|
|
#define pte_unmap(pte) do { } while (0)
|
|
|
|
#define pte_unmap_nested(pte) do { } while (0)
|
|
|
|
|
2016-01-25 11:45:07 +00:00
|
|
|
#define pte_set_fixmap(addr) ((pte_t *)set_fixmap_offset(FIX_PTE, addr))
|
|
|
|
#define pte_set_fixmap_offset(pmd, addr) pte_set_fixmap(pte_offset_phys(pmd, addr))
|
|
|
|
#define pte_clear_fixmap() clear_fixmap(FIX_PTE)
|
|
|
|
|
2017-12-13 17:07:21 +00:00
|
|
|
#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(__pmd_to_phys(pmd)))
|
2012-03-05 11:49:27 +00:00
|
|
|
|
2016-02-16 12:52:37 +00:00
|
|
|
/* use ONLY for statically allocated translation tables */
|
|
|
|
#define pte_offset_kimg(dir,addr) ((pte_t *)__phys_to_kimg(pte_offset_phys((dir), (addr))))
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
/*
|
|
|
|
* Conversion functions: convert a page and protection to a page entry,
|
|
|
|
* and a page entry and page directory to the page they refer to.
|
|
|
|
*/
|
|
|
|
#define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot)
|
|
|
|
|
2015-04-14 22:45:39 +00:00
|
|
|
#if CONFIG_PGTABLE_LEVELS > 2
|
2012-03-05 11:49:27 +00:00
|
|
|
|
2014-07-21 13:52:49 +00:00
|
|
|
#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
#define pud_none(pud) (!pud_val(pud))
|
2016-05-05 09:44:01 +00:00
|
|
|
#define pud_bad(pud) (!(pud_val(pud) & PUD_TABLE_BIT))
|
2017-06-08 17:25:26 +00:00
|
|
|
#define pud_present(pud) pte_present(pud_pte(pud))
|
2012-03-05 11:49:27 +00:00
|
|
|
|
|
|
|
static inline void set_pud(pud_t *pudp, pud_t pud)
|
|
|
|
{
|
2018-02-15 11:14:56 +00:00
|
|
|
WRITE_ONCE(*pudp, pud);
|
2014-05-02 15:24:10 +00:00
|
|
|
dsb(ishst);
|
2014-06-09 10:55:03 +00:00
|
|
|
isb();
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline void pud_clear(pud_t *pudp)
|
|
|
|
{
|
|
|
|
set_pud(pudp, __pud(0));
|
|
|
|
}
|
|
|
|
|
2016-01-25 11:45:04 +00:00
|
|
|
static inline phys_addr_t pud_page_paddr(pud_t pud)
|
2012-03-05 11:49:27 +00:00
|
|
|
{
|
2017-12-13 17:07:21 +00:00
|
|
|
return __pud_to_phys(pud);
|
2012-03-05 11:49:27 +00:00
|
|
|
}
|
|
|
|
|
2014-07-21 13:52:49 +00:00
|
|
|
/* Find an entry in the second-level page table. */
|
|
|
|
#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
|
|
|
|
|
2018-02-15 11:14:56 +00:00
|
|
|
#define pmd_offset_phys(dir, addr) (pud_page_paddr(READ_ONCE(*(dir))) + pmd_index(addr) * sizeof(pmd_t))
|
2016-01-25 11:45:04 +00:00
|
|
|
#define pmd_offset(dir, addr) ((pmd_t *)__va(pmd_offset_phys((dir), (addr))))
|
2014-07-21 13:52:49 +00:00
|
|
|
|
2016-01-25 11:45:07 +00:00
|
|
|
#define pmd_set_fixmap(addr) ((pmd_t *)set_fixmap_offset(FIX_PMD, addr))
|
|
|
|
#define pmd_set_fixmap_offset(pud, addr) pmd_set_fixmap(pmd_offset_phys(pud, addr))
|
|
|
|
#define pmd_clear_fixmap() clear_fixmap(FIX_PMD)
|
2014-07-21 13:52:49 +00:00
|
|
|
|
2017-12-13 17:07:21 +00:00
|
|
|
#define pud_page(pud) pfn_to_page(__phys_to_pfn(__pud_to_phys(pud)))
|
2014-10-09 22:29:25 +00:00
|
|
|
|
2016-02-16 12:52:37 +00:00
|
|
|
/* use ONLY for statically allocated translation tables */
|
|
|
|
#define pmd_offset_kimg(dir,addr) ((pmd_t *)__phys_to_kimg(pmd_offset_phys((dir), (addr))))
|
|
|
|
|
2016-01-25 11:45:04 +00:00
|
|
|
#else
|
|
|
|
|
|
|
|
#define pud_page_paddr(pud) ({ BUILD_BUG(); 0; })
|
|
|
|
|
2016-01-25 11:45:07 +00:00
|
|
|
/* Match pmd_offset folding in <asm/generic/pgtable-nopmd.h> */
|
|
|
|
#define pmd_set_fixmap(addr) NULL
|
|
|
|
#define pmd_set_fixmap_offset(pudp, addr) ((pmd_t *)pudp)
|
|
|
|
#define pmd_clear_fixmap()
|
|
|
|
|
2016-02-16 12:52:37 +00:00
|
|
|
#define pmd_offset_kimg(dir,addr) ((pmd_t *)dir)
|
|
|
|
|
2015-04-14 22:45:39 +00:00
|
|
|
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
|
2012-03-05 11:49:27 +00:00
|
|
|
|
2015-04-14 22:45:39 +00:00
|
|
|
#if CONFIG_PGTABLE_LEVELS > 3
|
2014-05-12 09:40:51 +00:00
|
|
|
|
2014-07-21 13:52:49 +00:00
|
|
|
#define pud_ERROR(pud) __pud_error(__FILE__, __LINE__, pud_val(pud))
|
|
|
|
|
2014-05-12 09:40:51 +00:00
|
|
|
#define pgd_none(pgd) (!pgd_val(pgd))
|
|
|
|
#define pgd_bad(pgd) (!(pgd_val(pgd) & 2))
|
|
|
|
#define pgd_present(pgd) (pgd_val(pgd))
|
|
|
|
|
|
|
|
static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
|
|
|
|
{
|
2018-02-15 11:14:56 +00:00
|
|
|
WRITE_ONCE(*pgdp, pgd);
|
2014-05-12 09:40:51 +00:00
|
|
|
dsb(ishst);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void pgd_clear(pgd_t *pgdp)
|
|
|
|
{
|
|
|
|
set_pgd(pgdp, __pgd(0));
|
|
|
|
}
|
|
|
|
|
2016-01-25 11:45:04 +00:00
|
|
|
static inline phys_addr_t pgd_page_paddr(pgd_t pgd)
|
2014-05-12 09:40:51 +00:00
|
|
|
{
|
2017-12-13 17:07:21 +00:00
|
|
|
return __pgd_to_phys(pgd);
|
2014-05-12 09:40:51 +00:00
|
|
|
}
|
|
|
|
|
2014-07-21 13:52:49 +00:00
|
|
|
/* Find an entry in the frst-level page table. */
|
|
|
|
#define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
|
|
|
|
|
2018-02-15 11:14:56 +00:00
|
|
|
#define pud_offset_phys(dir, addr) (pgd_page_paddr(READ_ONCE(*(dir))) + pud_index(addr) * sizeof(pud_t))
|
2016-01-25 11:45:04 +00:00
|
|
|
#define pud_offset(dir, addr) ((pud_t *)__va(pud_offset_phys((dir), (addr))))
|
2014-07-21 13:52:49 +00:00
|
|
|
|
2016-01-25 11:45:07 +00:00
|
|
|
#define pud_set_fixmap(addr) ((pud_t *)set_fixmap_offset(FIX_PUD, addr))
|
|
|
|
#define pud_set_fixmap_offset(pgd, addr) pud_set_fixmap(pud_offset_phys(pgd, addr))
|
|
|
|
#define pud_clear_fixmap() clear_fixmap(FIX_PUD)
|
2014-07-21 13:52:49 +00:00
|
|
|
|
2017-12-13 17:07:21 +00:00
|
|
|
#define pgd_page(pgd) pfn_to_page(__phys_to_pfn(__pgd_to_phys(pgd)))
|
2014-12-20 00:49:40 +00:00
|
|
|
|
2016-02-16 12:52:37 +00:00
|
|
|
/* use ONLY for statically allocated translation tables */
|
|
|
|
#define pud_offset_kimg(dir,addr) ((pud_t *)__phys_to_kimg(pud_offset_phys((dir), (addr))))
|
|
|
|
|
2016-01-25 11:45:04 +00:00
|
|
|
#else
|
|
|
|
|
|
|
|
#define pgd_page_paddr(pgd) ({ BUILD_BUG(); 0;})
|
|
|
|
|
2016-01-25 11:45:07 +00:00
|
|
|
/* Match pud_offset folding in <asm/generic/pgtable-nopud.h> */
|
|
|
|
#define pud_set_fixmap(addr) NULL
|
|
|
|
#define pud_set_fixmap_offset(pgdp, addr) ((pud_t *)pgdp)
|
|
|
|
#define pud_clear_fixmap()
|
|
|
|
|
2016-02-16 12:52:37 +00:00
|
|
|
#define pud_offset_kimg(dir,addr) ((pud_t *)dir)
|
|
|
|
|
2015-04-14 22:45:39 +00:00
|
|
|
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
|
2014-05-12 09:40:51 +00:00
|
|
|
|
2014-07-21 13:52:49 +00:00
|
|
|
#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
/* to find an entry in a page-table-directory */
|
|
|
|
#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
|
|
|
|
|
2016-01-25 11:45:04 +00:00
|
|
|
#define pgd_offset_raw(pgd, addr) ((pgd) + pgd_index(addr))
|
|
|
|
|
|
|
|
#define pgd_offset(mm, addr) (pgd_offset_raw((mm)->pgd, (addr)))
|
2012-03-05 11:49:27 +00:00
|
|
|
|
|
|
|
/* to find an entry in a kernel page-table-directory */
|
|
|
|
#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
|
|
|
|
|
2016-01-25 11:45:07 +00:00
|
|
|
#define pgd_set_fixmap(addr) ((pgd_t *)set_fixmap_offset(FIX_PGD, addr))
|
|
|
|
#define pgd_clear_fixmap() clear_fixmap(FIX_PGD)
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
|
|
|
|
{
|
2012-12-18 14:15:15 +00:00
|
|
|
const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
|
2015-10-01 12:06:07 +00:00
|
|
|
PTE_PROT_NONE | PTE_VALID | PTE_WRITE;
|
2015-07-10 16:24:28 +00:00
|
|
|
/* preserve the hardware dirty information */
|
|
|
|
if (pte_hw_dirty(pte))
|
2015-09-11 17:22:01 +00:00
|
|
|
pte = pte_mkdirty(pte);
|
2012-03-05 11:49:27 +00:00
|
|
|
pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
|
|
|
|
return pte;
|
|
|
|
}
|
|
|
|
|
2014-02-25 10:02:13 +00:00
|
|
|
static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
|
|
|
|
{
|
|
|
|
return pte_pmd(pte_modify(pmd_pte(pmd), newprot));
|
|
|
|
}
|
|
|
|
|
2016-04-13 15:01:22 +00:00
|
|
|
#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
|
|
|
|
extern int ptep_set_access_flags(struct vm_area_struct *vma,
|
|
|
|
unsigned long address, pte_t *ptep,
|
|
|
|
pte_t entry, int dirty);
|
|
|
|
|
2016-05-05 09:44:00 +00:00
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
|
|
#define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
|
|
|
|
static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
|
|
|
|
unsigned long address, pmd_t *pmdp,
|
|
|
|
pmd_t entry, int dirty)
|
|
|
|
{
|
|
|
|
return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2015-07-10 16:24:28 +00:00
|
|
|
/*
|
|
|
|
* Atomic pte/pmd modifications.
|
|
|
|
*/
|
|
|
|
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
|
2016-04-13 16:57:37 +00:00
|
|
|
static inline int __ptep_test_and_clear_young(pte_t *ptep)
|
2015-07-10 16:24:28 +00:00
|
|
|
{
|
2017-06-26 13:27:36 +00:00
|
|
|
pte_t old_pte, pte;
|
2015-07-10 16:24:28 +00:00
|
|
|
|
2017-06-26 13:27:36 +00:00
|
|
|
pte = READ_ONCE(*ptep);
|
|
|
|
do {
|
|
|
|
old_pte = pte;
|
|
|
|
pte = pte_mkold(pte);
|
|
|
|
pte_val(pte) = cmpxchg_relaxed(&pte_val(*ptep),
|
|
|
|
pte_val(old_pte), pte_val(pte));
|
|
|
|
} while (pte_val(pte) != pte_val(old_pte));
|
2015-07-10 16:24:28 +00:00
|
|
|
|
2017-06-26 13:27:36 +00:00
|
|
|
return pte_young(pte);
|
2015-07-10 16:24:28 +00:00
|
|
|
}
|
|
|
|
|
2016-04-13 16:57:37 +00:00
|
|
|
static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
|
|
|
|
unsigned long address,
|
|
|
|
pte_t *ptep)
|
|
|
|
{
|
|
|
|
return __ptep_test_and_clear_young(ptep);
|
|
|
|
}
|
|
|
|
|
2015-07-10 16:24:28 +00:00
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
|
|
#define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
|
|
|
|
static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
|
|
|
|
unsigned long address,
|
|
|
|
pmd_t *pmdp)
|
|
|
|
{
|
|
|
|
return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp);
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
|
|
|
|
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
|
|
|
|
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
|
|
|
|
unsigned long address, pte_t *ptep)
|
|
|
|
{
|
2017-06-26 13:27:36 +00:00
|
|
|
return __pte(xchg_relaxed(&pte_val(*ptep), 0));
|
2015-07-10 16:24:28 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
2016-05-05 09:43:59 +00:00
|
|
|
#define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
|
|
|
|
static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
|
|
|
|
unsigned long address, pmd_t *pmdp)
|
2015-07-10 16:24:28 +00:00
|
|
|
{
|
|
|
|
return pte_pmd(ptep_get_and_clear(mm, address, (pte_t *)pmdp));
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
|
|
|
|
|
|
|
|
/*
|
2017-12-01 17:22:14 +00:00
|
|
|
* ptep_set_wrprotect - mark read-only while trasferring potential hardware
|
|
|
|
* dirty status (PTE_DBM && !PTE_RDONLY) to the software PTE_DIRTY bit.
|
2015-07-10 16:24:28 +00:00
|
|
|
*/
|
|
|
|
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
|
|
|
|
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long address, pte_t *ptep)
|
|
|
|
{
|
2017-06-26 13:27:36 +00:00
|
|
|
pte_t old_pte, pte;
|
|
|
|
|
|
|
|
pte = READ_ONCE(*ptep);
|
|
|
|
do {
|
|
|
|
old_pte = pte;
|
2017-12-01 17:22:14 +00:00
|
|
|
/*
|
|
|
|
* If hardware-dirty (PTE_WRITE/DBM bit set and PTE_RDONLY
|
|
|
|
* clear), set the PTE_DIRTY bit.
|
|
|
|
*/
|
|
|
|
if (pte_hw_dirty(pte))
|
|
|
|
pte = pte_mkdirty(pte);
|
2017-06-26 13:27:36 +00:00
|
|
|
pte = pte_wrprotect(pte);
|
|
|
|
pte_val(pte) = cmpxchg_relaxed(&pte_val(*ptep),
|
|
|
|
pte_val(old_pte), pte_val(pte));
|
|
|
|
} while (pte_val(pte) != pte_val(old_pte));
|
2015-07-10 16:24:28 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
|
|
#define __HAVE_ARCH_PMDP_SET_WRPROTECT
|
|
|
|
static inline void pmdp_set_wrprotect(struct mm_struct *mm,
|
|
|
|
unsigned long address, pmd_t *pmdp)
|
|
|
|
{
|
|
|
|
ptep_set_wrprotect(mm, address, (pte_t *)pmdp);
|
|
|
|
}
|
2018-02-01 00:17:55 +00:00
|
|
|
|
|
|
|
#define pmdp_establish pmdp_establish
|
|
|
|
static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
|
|
|
|
unsigned long address, pmd_t *pmdp, pmd_t pmd)
|
|
|
|
{
|
|
|
|
return __pmd(xchg_relaxed(&pmd_val(*pmdp), pmd_val(pmd)));
|
|
|
|
}
|
2015-07-10 16:24:28 +00:00
|
|
|
#endif
|
|
|
|
|
2012-03-05 11:49:27 +00:00
|
|
|
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
|
2018-01-11 10:11:59 +00:00
|
|
|
extern pgd_t swapper_pg_end[];
|
2012-03-05 11:49:27 +00:00
|
|
|
extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
|
2017-11-14 14:14:17 +00:00
|
|
|
extern pgd_t tramp_pg_dir[PTRS_PER_PGD];
|
2012-03-05 11:49:27 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Encode and decode a swap entry:
|
2013-11-27 16:59:27 +00:00
|
|
|
* bits 0-1: present (must be zero)
|
2015-02-10 22:10:15 +00:00
|
|
|
* bits 2-7: swap type
|
|
|
|
* bits 8-57: swap offset
|
2016-03-09 16:31:29 +00:00
|
|
|
* bit 58: PTE_PROT_NONE (must be zero)
|
2012-03-05 11:49:27 +00:00
|
|
|
*/
|
2015-02-10 22:10:15 +00:00
|
|
|
#define __SWP_TYPE_SHIFT 2
|
2012-03-05 11:49:27 +00:00
|
|
|
#define __SWP_TYPE_BITS 6
|
2015-02-10 22:10:15 +00:00
|
|
|
#define __SWP_OFFSET_BITS 50
|
2012-03-05 11:49:27 +00:00
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#define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
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#define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
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2013-11-27 16:59:27 +00:00
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#define __SWP_OFFSET_MASK ((1UL << __SWP_OFFSET_BITS) - 1)
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2012-03-05 11:49:27 +00:00
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#define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
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2013-11-27 16:59:27 +00:00
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#define __swp_offset(x) (((x).val >> __SWP_OFFSET_SHIFT) & __SWP_OFFSET_MASK)
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2012-03-05 11:49:27 +00:00
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#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
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#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
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/*
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* Ensure that there are not more swap files than can be encoded in the kernel
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2014-03-11 10:23:39 +00:00
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* PTEs.
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2012-03-05 11:49:27 +00:00
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*/
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#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
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extern int kern_addr_valid(unsigned long addr);
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#include <asm-generic/pgtable.h>
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2016-01-05 15:36:59 +00:00
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void pgd_cache_init(void);
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#define pgtable_cache_init pgd_cache_init
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2012-03-05 11:49:27 +00:00
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2015-07-16 18:26:02 +00:00
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/*
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* On AArch64, the cache coherency is handled via the set_pte_at() function.
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*/
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static inline void update_mmu_cache(struct vm_area_struct *vma,
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unsigned long addr, pte_t *ptep)
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{
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/*
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2015-10-06 17:46:30 +00:00
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* We don't do anything here, so there's a very small chance of
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* us retaking a user fault which we just fixed up. The alternative
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* is doing a dsb(ishst), but that penalises the fastpath.
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2015-07-16 18:26:02 +00:00
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*/
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}
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#define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
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2015-10-16 13:34:50 +00:00
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#define kc_vaddr_to_offset(v) ((v) & ~VA_START)
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#define kc_offset_to_vaddr(o) ((o) | VA_START)
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2017-12-13 17:07:18 +00:00
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#ifdef CONFIG_ARM64_PA_BITS_52
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#define phys_to_ttbr(addr) (((addr) | ((addr) >> 46)) & TTBR_BADDR_MASK_52)
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#else
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#define phys_to_ttbr(addr) (addr)
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#endif
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2012-03-05 11:49:27 +00:00
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_PGTABLE_H */
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