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ca15ca406f
Patch series "mm: cleanup usage of <asm/pgalloc.h>"
Most architectures have very similar versions of pXd_alloc_one() and
pXd_free_one() for intermediate levels of page table. These patches add
generic versions of these functions in <asm-generic/pgalloc.h> and enable
use of the generic functions where appropriate.
In addition, functions declared and defined in <asm/pgalloc.h> headers are
used mostly by core mm and early mm initialization in arch and there is no
actual reason to have the <asm/pgalloc.h> included all over the place.
The first patch in this series removes unneeded includes of
<asm/pgalloc.h>
In the end it didn't work out as neatly as I hoped and moving
pXd_alloc_track() definitions to <asm-generic/pgalloc.h> would require
unnecessary changes to arches that have custom page table allocations, so
I've decided to move lib/ioremap.c to mm/ and make pgalloc-track.h local
to mm/.
This patch (of 8):
In most cases <asm/pgalloc.h> header is required only for allocations of
page table memory. Most of the .c files that include that header do not
use symbols declared in <asm/pgalloc.h> and do not require that header.
As for the other header files that used to include <asm/pgalloc.h>, it is
possible to move that include into the .c file that actually uses symbols
from <asm/pgalloc.h> and drop the include from the header file.
The process was somewhat automated using
sed -i -E '/[<"]asm\/pgalloc\.h/d' \
$(grep -L -w -f /tmp/xx \
$(git grep -E -l '[<"]asm/pgalloc\.h'))
where /tmp/xx contains all the symbols defined in
arch/*/include/asm/pgalloc.h.
[rppt@linux.ibm.com: fix powerpc warning]
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Link: http://lkml.kernel.org/r/20200627143453.31835-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200627143453.31835-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* arch/sh/mm/tlb-sh3.c
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*
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* SH-3 specific TLB operations
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*
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* Copyright (C) 1999 Niibe Yutaka
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* Copyright (C) 2002 Paul Mundt
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*/
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/mman.h>
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#include <linux/mm.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <asm/io.h>
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#include <linux/uaccess.h>
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#include <asm/mmu_context.h>
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#include <asm/cacheflush.h>
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void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
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{
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unsigned long flags, pteval, vpn;
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/*
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* Handle debugger faulting in for debugee.
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*/
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if (vma && current->active_mm != vma->vm_mm)
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return;
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local_irq_save(flags);
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/* Set PTEH register */
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vpn = (address & MMU_VPN_MASK) | get_asid();
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__raw_writel(vpn, MMU_PTEH);
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pteval = pte_val(pte);
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/* Set PTEL register */
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pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
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/* conveniently, we want all the software flags to be 0 anyway */
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__raw_writel(pteval, MMU_PTEL);
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/* Load the TLB */
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asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
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local_irq_restore(flags);
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}
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void local_flush_tlb_one(unsigned long asid, unsigned long page)
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{
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unsigned long addr, data;
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int i, ways = MMU_NTLB_WAYS;
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/*
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* NOTE: PTEH.ASID should be set to this MM
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* _AND_ we need to write ASID to the array.
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*
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* It would be simple if we didn't need to set PTEH.ASID...
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*/
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addr = MMU_TLB_ADDRESS_ARRAY | (page & 0x1F000);
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data = (page & 0xfffe0000) | asid; /* VALID bit is off */
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if ((current_cpu_data.flags & CPU_HAS_MMU_PAGE_ASSOC)) {
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addr |= MMU_PAGE_ASSOC_BIT;
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ways = 1; /* we already know the way .. */
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}
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for (i = 0; i < ways; i++)
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__raw_writel(data, addr + (i << 8));
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}
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void local_flush_tlb_all(void)
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{
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unsigned long flags, status;
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/*
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* Flush all the TLB.
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*
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* Write to the MMU control register's bit:
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* TF-bit for SH-3, TI-bit for SH-4.
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* It's same position, bit #2.
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*/
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local_irq_save(flags);
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status = __raw_readl(MMUCR);
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status |= 0x04;
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__raw_writel(status, MMUCR);
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ctrl_barrier();
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local_irq_restore(flags);
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}
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