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m68k/mm: enable ARCH_HAS_VM_GET_PAGE_PROT

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This enables ARCH_HAS_VM_GET_PAGE_PROT on the platform and exports
standard vm_get_page_prot() implementation via DECLARE_VM_GET_PAGE_PROT,
which looks up a private and static protection_map[] array.  Subsequently
all __SXXX and __PXXX macros can be dropped which are no longer needed.

Link: https://lkml.kernel.org/r/20220711070600.2378316-22-anshuman.khandual@arm.com
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Brian Cain <bcain@quicinc.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Anshuman Khandual 2022-07-11 12:35:55 +05:30 committed by akpm
parent 499c1dd92e
commit 6d0b922545
7 changed files with 105 additions and 111 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/m68k/Kconfig
View File

@ -7,6 +7,7 @@ config M68K
select ARCH_HAS_CURRENT_STACK_POINTER
select ARCH_HAS_DMA_PREP_COHERENT if HAS_DMA && MMU && !COLDFIRE
select ARCH_HAS_SYNC_DMA_FOR_DEVICE if HAS_DMA
select ARCH_HAS_VM_GET_PAGE_PROT
select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
select ARCH_NO_PREEMPT if !COLDFIRE

59
arch/m68k/include/asm/mcf_pgtable.h
View File

@ -86,65 +86,6 @@
| CF_PAGE_READABLE \
| CF_PAGE_DIRTY)
/*
* Page protections for initialising protection_map. See mm/mmap.c
* for use. In general, the bit positions are xwr, and P-items are
* private, the S-items are shared.
*/
#define __P000 PAGE_NONE
#define __P001 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE)
#define __P010 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_WRITABLE)
#define __P011 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE)
#define __P100 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_EXEC)
#define __P101 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define __P110 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC)
#define __P111 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_WRITABLE \
| CF_PAGE_EXEC)
#define __S000 PAGE_NONE
#define __S001 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE)
#define __S010 PAGE_SHARED
#define __S011 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_SHARED \
| CF_PAGE_READABLE)
#define __S100 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_EXEC)
#define __S101 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define __S110 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_SHARED \
| CF_PAGE_EXEC)
#define __S111 __pgprot(CF_PAGE_VALID \
| CF_PAGE_ACCESSED \
| CF_PAGE_SHARED \
| CF_PAGE_READABLE \
| CF_PAGE_EXEC)
#define PTE_MASK PAGE_MASK
#define CF_PAGE_CHG_MASK (PTE_MASK | CF_PAGE_ACCESSED | CF_PAGE_DIRTY)

29
arch/m68k/include/asm/motorola_pgtable.h
View File

@ -76,35 +76,6 @@ extern unsigned long mm_cachebits;
#define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
#define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)
/* Alternate definitions that are compile time constants, for
initializing protection_map. The cachebits are fixed later. */
#define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
#define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
#define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
#define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
/*
* The m68k can't do page protection for execute, and considers that the same are read.
* Also, write permissions imply read permissions. This is the closest we can get..
*/
#define __P000 PAGE_NONE_C
#define __P001 PAGE_READONLY_C
#define __P010 PAGE_COPY_C
#define __P011 PAGE_COPY_C
#define __P100 PAGE_READONLY_C
#define __P101 PAGE_READONLY_C
#define __P110 PAGE_COPY_C
#define __P111 PAGE_COPY_C
#define __S000 PAGE_NONE_C
#define __S001 PAGE_READONLY_C
#define __S010 PAGE_SHARED_C
#define __S011 PAGE_SHARED_C
#define __S100 PAGE_READONLY_C
#define __S101 PAGE_READONLY_C
#define __S110 PAGE_SHARED_C
#define __S111 PAGE_SHARED_C
#define pmd_pgtable(pmd) ((pgtable_t)pmd_page_vaddr(pmd))
/*

23
arch/m68k/include/asm/sun3_pgtable.h
View File

@ -66,29 +66,6 @@
| SUN3_PAGE_SYSTEM \
| SUN3_PAGE_NOCACHE)
/*
* Page protections for initialising protection_map. The sun3 has only two
* protection settings, valid (implying read and execute) and writeable. These
* are as close as we can get...
*/
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY
#define __P100 PAGE_READONLY
#define __P101 PAGE_READONLY
#define __P110 PAGE_COPY
#define __P111 PAGE_COPY
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY
#define __S010 PAGE_SHARED
#define __S011 PAGE_SHARED
#define __S100 PAGE_READONLY
#define __S101 PAGE_READONLY
#define __S110 PAGE_SHARED
#define __S111 PAGE_SHARED
/* Use these fake page-protections on PMDs. */
#define SUN3_PMD_VALID (0x00000001)
#define SUN3_PMD_MASK (0x0000003F)

55
arch/m68k/mm/mcfmmu.c
View File

@ -234,3 +234,58 @@ void steal_context(void)
destroy_context(mm);
}
static const pgprot_t protection_map[16] = {
[VM_NONE] = PAGE_NONE,
[VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE),
[VM_WRITE] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_WRITABLE),
[VM_WRITE | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_WRITABLE),
[VM_EXEC] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_EXEC),
[VM_EXEC | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_EXEC),
[VM_EXEC | VM_WRITE] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_WRITABLE |
CF_PAGE_EXEC),
[VM_EXEC | VM_WRITE | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_WRITABLE |
CF_PAGE_EXEC),
[VM_SHARED] = PAGE_NONE,
[VM_SHARED | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE),
[VM_SHARED | VM_WRITE] = PAGE_SHARED,
[VM_SHARED | VM_WRITE | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_SHARED),
[VM_SHARED | VM_EXEC] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_EXEC),
[VM_SHARED | VM_EXEC | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_EXEC),
[VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_SHARED |
CF_PAGE_EXEC),
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_SHARED |
CF_PAGE_EXEC)
};
DECLARE_VM_GET_PAGE_PROT

29
arch/m68k/mm/motorola.c
View File

@ -382,6 +382,35 @@ static void __init map_node(int node)
#endif
}
/*
* Alternate definitions that are compile time constants, for
* initializing protection_map. The cachebits are fixed later.
*/
#define PAGE_NONE_C __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
#define PAGE_SHARED_C __pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
#define PAGE_COPY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
#define PAGE_READONLY_C __pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
static pgprot_t protection_map[16] __ro_after_init = {
[VM_NONE] = PAGE_NONE_C,
[VM_READ] = PAGE_READONLY_C,
[VM_WRITE] = PAGE_COPY_C,
[VM_WRITE | VM_READ] = PAGE_COPY_C,
[VM_EXEC] = PAGE_READONLY_C,
[VM_EXEC | VM_READ] = PAGE_READONLY_C,
[VM_EXEC | VM_WRITE] = PAGE_COPY_C,
[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_C,
[VM_SHARED] = PAGE_NONE_C,
[VM_SHARED | VM_READ] = PAGE_READONLY_C,
[VM_SHARED | VM_WRITE] = PAGE_SHARED_C,
[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED_C,
[VM_SHARED | VM_EXEC] = PAGE_READONLY_C,
[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_C,
[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_C,
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_C
};
DECLARE_VM_GET_PAGE_PROT
/*
* paging_init() continues the virtual memory environment setup which
* was begun by the code in arch/head.S.

20
arch/m68k/mm/sun3mmu.c
View File

@ -95,3 +95,23 @@ void __init paging_init(void)
}
static const pgprot_t protection_map[16] = {
[VM_NONE] = PAGE_NONE,
[VM_READ] = PAGE_READONLY,
[VM_WRITE] = PAGE_COPY,
[VM_WRITE | VM_READ] = PAGE_COPY,
[VM_EXEC] = PAGE_READONLY,
[VM_EXEC | VM_READ] = PAGE_READONLY,
[VM_EXEC | VM_WRITE] = PAGE_COPY,
[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY,
[VM_SHARED] = PAGE_NONE,
[VM_SHARED | VM_READ] = PAGE_READONLY,
[VM_SHARED | VM_WRITE] = PAGE_SHARED,
[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
[VM_SHARED | VM_EXEC] = PAGE_READONLY,
[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY,
[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED,
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED
};
DECLARE_VM_GET_PAGE_PROT