admin/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2025-12-07 20:06:24 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
e31cf2f4ca422ac9b14ecc4a1295b8977a20f812
linux/arch/mips/mm/c-r3k.c
Mike Rapoport e31cf2f4ca mm: don't include asm/pgtable.h if linux/mm.h is already included 
Patch series "mm: consolidate definitions of page table accessors", v2.

The low level page table accessors (pXY_index(), pXY_offset()) are
duplicated across all architectures and sometimes more than once.  For
instance, we have 31 definition of pgd_offset() for 25 supported
architectures.

Most of these definitions are actually identical and typically it boils
down to, e.g.

static inline unsigned long pmd_index(unsigned long address)
{
        return (address >> PMD_SHIFT) & (PTRS_PER_PMD - 1);
}

static inline pmd_t *pmd_offset(pud_t *pud, unsigned long address)
{
        return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(address);
}

These definitions can be shared among 90% of the arches provided
XYZ_SHIFT, PTRS_PER_XYZ and xyz_page_vaddr() are defined.

For architectures that really need a custom version there is always
possibility to override the generic version with the usual ifdefs magic.

These patches introduce include/linux/pgtable.h that replaces
include/asm-generic/pgtable.h and add the definitions of the page table
accessors to the new header.

This patch (of 12):

The linux/mm.h header includes <asm/pgtable.h> to allow inlining of the
functions involving page table manipulations, e.g.  pte_alloc() and
pmd_alloc().  So, there is no point to explicitly include <asm/pgtable.h>
in the files that include <linux/mm.h>.

The include statements in such cases are remove with a simple loop:

	for f in $(git grep -l "include <linux/mm.h>") ; do
		sed -i -e '/include <asm\/pgtable.h>/ d' $f
	done

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Link: http://lkml.kernel.org/r/20200514170327.31389-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200514170327.31389-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-09 09:39:13 -07:00

326 lines
7.6 KiB
C
Raw Blame History

// SPDX-License-Identifier: GPL-2.0
/*
* r2300.c: R2000 and R3000 specific mmu/cache code.
*
* Copyright (C) 1996 David S. Miller (davem@davemloft.net)
*
* with a lot of changes to make this thing work for R3000s
* Tx39XX R4k style caches added. HK
* Copyright (C) 1998, 1999, 2000 Harald Koerfgen
* Copyright (C) 1998 Gleb Raiko & Vladimir Roganov
* Copyright (C) 2001, 2004, 2007 Maciej W. Rozycki
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/mm.h>
#include <asm/page.h>
#include <asm/mmu_context.h>
#include <asm/isadep.h>
#include <asm/io.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
static unsigned long icache_size, dcache_size; /* Size in bytes */
static unsigned long icache_lsize, dcache_lsize; /* Size in bytes */
unsigned long r3k_cache_size(unsigned long ca_flags)
{
unsigned long flags, status, dummy, size;
volatile unsigned long *p;
p = (volatile unsigned long *) KSEG0;
flags = read_c0_status();
/* isolate cache space */
write_c0_status((ca_flags|flags)&~ST0_IEC);
*p = 0xa5a55a5a;
dummy = *p;
status = read_c0_status();
if (dummy != 0xa5a55a5a || (status & ST0_CM)) {
size = 0;
} else {
for (size = 128; size <= 0x40000; size <<= 1)
*(p + size) = 0;
*p = -1;
for (size = 128;
(size <= 0x40000) && (*(p + size) == 0);
size <<= 1)
;
if (size > 0x40000)
size = 0;
}
write_c0_status(flags);
return size * sizeof(*p);
}
unsigned long r3k_cache_lsize(unsigned long ca_flags)
{
unsigned long flags, status, lsize, i;
volatile unsigned long *p;
p = (volatile unsigned long *) KSEG0;
flags = read_c0_status();
/* isolate cache space */
write_c0_status((ca_flags|flags)&~ST0_IEC);
for (i = 0; i < 128; i++)
*(p + i) = 0;
*(volatile unsigned char *)p = 0;
for (lsize = 1; lsize < 128; lsize <<= 1) {
*(p + lsize);
status = read_c0_status();
if (!(status & ST0_CM))
break;
}
for (i = 0; i < 128; i += lsize)
*(volatile unsigned char *)(p + i) = 0;
write_c0_status(flags);
return lsize * sizeof(*p);
}
static void r3k_probe_cache(void)
{
dcache_size = r3k_cache_size(ST0_ISC);
if (dcache_size)
dcache_lsize = r3k_cache_lsize(ST0_ISC);
icache_size = r3k_cache_size(ST0_ISC|ST0_SWC);
if (icache_size)
icache_lsize = r3k_cache_lsize(ST0_ISC|ST0_SWC);
}
static void r3k_flush_icache_range(unsigned long start, unsigned long end)
{
unsigned long size, i, flags;
volatile unsigned char *p;
size = end - start;
if (size > icache_size || KSEGX(start) != KSEG0) {
start = KSEG0;
size = icache_size;
}
p = (char *)start;
flags = read_c0_status();
/* isolate cache space */
write_c0_status((ST0_ISC|ST0_SWC|flags)&~ST0_IEC);
for (i = 0; i < size; i += 0x080) {
asm( "sb\t$0, 0x000(%0)\n\t"
"sb\t$0, 0x004(%0)\n\t"
"sb\t$0, 0x008(%0)\n\t"
"sb\t$0, 0x00c(%0)\n\t"
"sb\t$0, 0x010(%0)\n\t"
"sb\t$0, 0x014(%0)\n\t"
"sb\t$0, 0x018(%0)\n\t"
"sb\t$0, 0x01c(%0)\n\t"
"sb\t$0, 0x020(%0)\n\t"
"sb\t$0, 0x024(%0)\n\t"
"sb\t$0, 0x028(%0)\n\t"
"sb\t$0, 0x02c(%0)\n\t"
"sb\t$0, 0x030(%0)\n\t"
"sb\t$0, 0x034(%0)\n\t"
"sb\t$0, 0x038(%0)\n\t"
"sb\t$0, 0x03c(%0)\n\t"
"sb\t$0, 0x040(%0)\n\t"
"sb\t$0, 0x044(%0)\n\t"
"sb\t$0, 0x048(%0)\n\t"
"sb\t$0, 0x04c(%0)\n\t"
"sb\t$0, 0x050(%0)\n\t"
"sb\t$0, 0x054(%0)\n\t"
"sb\t$0, 0x058(%0)\n\t"
"sb\t$0, 0x05c(%0)\n\t"
"sb\t$0, 0x060(%0)\n\t"
"sb\t$0, 0x064(%0)\n\t"
"sb\t$0, 0x068(%0)\n\t"
"sb\t$0, 0x06c(%0)\n\t"
"sb\t$0, 0x070(%0)\n\t"
"sb\t$0, 0x074(%0)\n\t"
"sb\t$0, 0x078(%0)\n\t"
"sb\t$0, 0x07c(%0)\n\t"
: : "r" (p) );
p += 0x080;
}
write_c0_status(flags);
}
static void r3k_flush_dcache_range(unsigned long start, unsigned long end)
{
unsigned long size, i, flags;
volatile unsigned char *p;
size = end - start;
if (size > dcache_size || KSEGX(start) != KSEG0) {
start = KSEG0;
size = dcache_size;
}
p = (char *)start;
flags = read_c0_status();
/* isolate cache space */
write_c0_status((ST0_ISC|flags)&~ST0_IEC);
for (i = 0; i < size; i += 0x080) {
asm( "sb\t$0, 0x000(%0)\n\t"
"sb\t$0, 0x004(%0)\n\t"
"sb\t$0, 0x008(%0)\n\t"
"sb\t$0, 0x00c(%0)\n\t"
"sb\t$0, 0x010(%0)\n\t"
"sb\t$0, 0x014(%0)\n\t"
"sb\t$0, 0x018(%0)\n\t"
"sb\t$0, 0x01c(%0)\n\t"
"sb\t$0, 0x020(%0)\n\t"
"sb\t$0, 0x024(%0)\n\t"
"sb\t$0, 0x028(%0)\n\t"
"sb\t$0, 0x02c(%0)\n\t"
"sb\t$0, 0x030(%0)\n\t"
"sb\t$0, 0x034(%0)\n\t"
"sb\t$0, 0x038(%0)\n\t"
"sb\t$0, 0x03c(%0)\n\t"
"sb\t$0, 0x040(%0)\n\t"
"sb\t$0, 0x044(%0)\n\t"
"sb\t$0, 0x048(%0)\n\t"
"sb\t$0, 0x04c(%0)\n\t"
"sb\t$0, 0x050(%0)\n\t"
"sb\t$0, 0x054(%0)\n\t"
"sb\t$0, 0x058(%0)\n\t"
"sb\t$0, 0x05c(%0)\n\t"
"sb\t$0, 0x060(%0)\n\t"
"sb\t$0, 0x064(%0)\n\t"
"sb\t$0, 0x068(%0)\n\t"
"sb\t$0, 0x06c(%0)\n\t"
"sb\t$0, 0x070(%0)\n\t"
"sb\t$0, 0x074(%0)\n\t"
"sb\t$0, 0x078(%0)\n\t"
"sb\t$0, 0x07c(%0)\n\t"
: : "r" (p) );
p += 0x080;
}
write_c0_status(flags);
}
static inline void r3k_flush_cache_all(void)
{
}
static inline void r3k___flush_cache_all(void)
{
r3k_flush_dcache_range(KSEG0, KSEG0 + dcache_size);
r3k_flush_icache_range(KSEG0, KSEG0 + icache_size);
}
static void r3k_flush_cache_mm(struct mm_struct *mm)
{
}
static void r3k_flush_cache_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end)
{
}
static void r3k_flush_cache_page(struct vm_area_struct *vma,
unsigned long addr, unsigned long pfn)
{
unsigned long kaddr = KSEG0ADDR(pfn << PAGE_SHIFT);
int exec = vma->vm_flags & VM_EXEC;
struct mm_struct *mm = vma->vm_mm;
pgd_t *pgdp;
p4d_t *p4dp;
pud_t *pudp;
pmd_t *pmdp;
pte_t *ptep;
pr_debug("cpage[%08llx,%08lx]\n",
cpu_context(smp_processor_id(), mm), addr);
/* No ASID => no such page in the cache. */
if (cpu_context(smp_processor_id(), mm) == 0)
return;
pgdp = pgd_offset(mm, addr);
p4dp = p4d_offset(pgdp, addr);
pudp = pud_offset(p4dp, addr);
pmdp = pmd_offset(pudp, addr);
ptep = pte_offset(pmdp, addr);
/* Invalid => no such page in the cache. */
if (!(pte_val(*ptep) & _PAGE_PRESENT))
return;
r3k_flush_dcache_range(kaddr, kaddr + PAGE_SIZE);
if (exec)
r3k_flush_icache_range(kaddr, kaddr + PAGE_SIZE);
}
static void local_r3k_flush_data_cache_page(void *addr)
{
}
static void r3k_flush_data_cache_page(unsigned long addr)
{
}
static void r3k_flush_kernel_vmap_range(unsigned long vaddr, int size)
{
BUG();
}
static void r3k_dma_cache_wback_inv(unsigned long start, unsigned long size)
{
/* Catch bad driver code */
BUG_ON(size == 0);
iob();
r3k_flush_dcache_range(start, start + size);
}
void r3k_cache_init(void)
{
extern void build_clear_page(void);
extern void build_copy_page(void);
r3k_probe_cache();
flush_cache_all = r3k_flush_cache_all;
__flush_cache_all = r3k___flush_cache_all;
flush_cache_mm = r3k_flush_cache_mm;
flush_cache_range = r3k_flush_cache_range;
flush_cache_page = r3k_flush_cache_page;
flush_icache_range = r3k_flush_icache_range;
local_flush_icache_range = r3k_flush_icache_range;
__flush_icache_user_range = r3k_flush_icache_range;
__local_flush_icache_user_range = r3k_flush_icache_range;
__flush_kernel_vmap_range = r3k_flush_kernel_vmap_range;
local_flush_data_cache_page = local_r3k_flush_data_cache_page;
flush_data_cache_page = r3k_flush_data_cache_page;
_dma_cache_wback_inv = r3k_dma_cache_wback_inv;
_dma_cache_wback = r3k_dma_cache_wback_inv;
_dma_cache_inv = r3k_dma_cache_wback_inv;
pr_info("Primary instruction cache %ldkB, linesize %ld bytes.\n",
icache_size >> 10, icache_lsize);
pr_info("Primary data cache %ldkB, linesize %ld bytes.\n",
dcache_size >> 10, dcache_lsize);
build_clear_page();
build_copy_page();
}
Reference in New Issue View Git Blame Copy Permalink