mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
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>
135 lines
2.6 KiB
C
135 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Re-map IO memory to kernel address space so that we can access it.
|
|
*
|
|
* These functions should only be used when it is necessary to map a
|
|
* physical address space into the kernel address space before ioremap()
|
|
* can be used, e.g. early in boot before paging_init().
|
|
*
|
|
* Copyright (C) 2009 Matt Fleming
|
|
*/
|
|
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/io.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/page.h>
|
|
#include <asm/addrspace.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/mmu.h>
|
|
#include <asm/mmu_context.h>
|
|
|
|
struct ioremap_map {
|
|
void __iomem *addr;
|
|
unsigned long size;
|
|
unsigned long fixmap_addr;
|
|
};
|
|
|
|
static struct ioremap_map ioremap_maps[FIX_N_IOREMAPS];
|
|
|
|
void __init ioremap_fixed_init(void)
|
|
{
|
|
struct ioremap_map *map;
|
|
int i;
|
|
|
|
for (i = 0; i < FIX_N_IOREMAPS; i++) {
|
|
map = &ioremap_maps[i];
|
|
map->fixmap_addr = __fix_to_virt(FIX_IOREMAP_BEGIN + i);
|
|
}
|
|
}
|
|
|
|
void __init __iomem *
|
|
ioremap_fixed(phys_addr_t phys_addr, unsigned long size, pgprot_t prot)
|
|
{
|
|
enum fixed_addresses idx0, idx;
|
|
struct ioremap_map *map;
|
|
unsigned int nrpages;
|
|
unsigned long offset;
|
|
int i, slot;
|
|
|
|
/*
|
|
* Mappings have to be page-aligned
|
|
*/
|
|
offset = phys_addr & ~PAGE_MASK;
|
|
phys_addr &= PAGE_MASK;
|
|
size = PAGE_ALIGN(phys_addr + size) - phys_addr;
|
|
|
|
slot = -1;
|
|
for (i = 0; i < FIX_N_IOREMAPS; i++) {
|
|
map = &ioremap_maps[i];
|
|
if (!map->addr) {
|
|
map->size = size;
|
|
slot = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (slot < 0)
|
|
return NULL;
|
|
|
|
/*
|
|
* Mappings have to fit in the FIX_IOREMAP area.
|
|
*/
|
|
nrpages = size >> PAGE_SHIFT;
|
|
if (nrpages > FIX_N_IOREMAPS)
|
|
return NULL;
|
|
|
|
/*
|
|
* Ok, go for it..
|
|
*/
|
|
idx0 = FIX_IOREMAP_BEGIN + slot;
|
|
idx = idx0;
|
|
while (nrpages > 0) {
|
|
pgprot_val(prot) |= _PAGE_WIRED;
|
|
__set_fixmap(idx, phys_addr, prot);
|
|
phys_addr += PAGE_SIZE;
|
|
idx++;
|
|
--nrpages;
|
|
}
|
|
|
|
map->addr = (void __iomem *)(offset + map->fixmap_addr);
|
|
return map->addr;
|
|
}
|
|
|
|
int iounmap_fixed(void __iomem *addr)
|
|
{
|
|
enum fixed_addresses idx;
|
|
struct ioremap_map *map;
|
|
unsigned int nrpages;
|
|
int i, slot;
|
|
|
|
slot = -1;
|
|
for (i = 0; i < FIX_N_IOREMAPS; i++) {
|
|
map = &ioremap_maps[i];
|
|
if (map->addr == addr) {
|
|
slot = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If we don't match, it's not for us.
|
|
*/
|
|
if (slot < 0)
|
|
return -EINVAL;
|
|
|
|
nrpages = map->size >> PAGE_SHIFT;
|
|
|
|
idx = FIX_IOREMAP_BEGIN + slot + nrpages - 1;
|
|
while (nrpages > 0) {
|
|
__clear_fixmap(idx, __pgprot(_PAGE_WIRED));
|
|
--idx;
|
|
--nrpages;
|
|
}
|
|
|
|
map->size = 0;
|
|
map->addr = NULL;
|
|
|
|
return 0;
|
|
}
|