system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-07-24 12:11:06 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

microblaze/mm/highmem: Switch to generic kmap atomic

Browse source 
No reason having the same code in every architecture.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20201103095857.777445435@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-11-03 10:27:24 +01:00
parent 5af627a043
commit 7ac1b26b0a
6 changed files with 8 additions and 88 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
arch/microblaze/Kconfig
View file

@ -155,6 +155,7 @@ config XILINX_UNCACHED_SHADOW
config HIGHMEM
bool "High memory support"
depends on MMU
select KMAP_LOCAL
help
The address space of Microblaze processors is only 4 Gigabytes large
and it has to accommodate user address space, kernel address

4
arch/microblaze/include/asm/fixmap.h
View file

@ -20,7 +20,7 @@
#include <asm/page.h>
#ifdef CONFIG_HIGHMEM
#include <linux/threads.h>
#include <asm/kmap_types.h>
#include <asm/kmap_size.h>
#endif
#define FIXADDR_TOP ((unsigned long)(-PAGE_SIZE))
@ -47,7 +47,7 @@ enum fixed_addresses {
FIX_HOLE,
#ifdef CONFIG_HIGHMEM
FIX_KMAP_BEGIN, /* reserved pte's for temporary kernel mappings */
FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_TYPE_NR * num_possible_cpus()) - 1,
FIX_KMAP_END = FIX_KMAP_BEGIN + (KM_MAX_IDX * num_possible_cpus()) - 1,
#endif
__end_of_fixed_addresses
};

6
arch/microblaze/include/asm/highmem.h
View file

@ -25,7 +25,6 @@
#include <linux/uaccess.h>
#include <asm/fixmap.h>
extern pte_t *kmap_pte;
extern pte_t *pkmap_page_table;
/*
@ -52,6 +51,11 @@ extern pte_t *pkmap_page_table;
#define flush_cache_kmaps() { flush_icache(); flush_dcache(); }
#define arch_kmap_local_post_map(vaddr, pteval) \
local_flush_tlb_page(NULL, vaddr);
#define arch_kmap_local_post_unmap(vaddr) \
local_flush_tlb_page(NULL, vaddr);
#endif /* __KERNEL__ */
#endif /* _ASM_HIGHMEM_H */

1
arch/microblaze/mm/Makefile
View file

@ -6,4 +6,3 @@
obj-y := consistent.o init.o
obj-$(CONFIG_MMU) += pgtable.o mmu_context.o fault.o
obj-$(CONFIG_HIGHMEM) += highmem.o

78
arch/microblaze/mm/highmem.c
View file

@ -1,78 +0,0 @@
// SPDX-License-Identifier: GPL-2.0
/*
* highmem.c: virtual kernel memory mappings for high memory
*
* PowerPC version, stolen from the i386 version.
*
* Used in CONFIG_HIGHMEM systems for memory pages which
* are not addressable by direct kernel virtual addresses.
*
* Copyright (C) 1999 Gerhard Wichert, Siemens AG
* Gerhard.Wichert@pdb.siemens.de
*
*
* Redesigned the x86 32-bit VM architecture to deal with
* up to 16 Terrabyte physical memory. With current x86 CPUs
* we now support up to 64 Gigabytes physical RAM.
*
* Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
*
* Reworked for PowerPC by various contributors. Moved from
* highmem.h by Benjamin Herrenschmidt (c) 2009 IBM Corp.
*/
#include <linux/export.h>
#include <linux/highmem.h>
/*
* The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
* gives a more generic (and caching) interface. But kmap_atomic can
* be used in IRQ contexts, so in some (very limited) cases we need
* it.
*/
#include <asm/tlbflush.h>
void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
{
unsigned long vaddr;
int idx, type;
type = kmap_atomic_idx_push();
idx = type + KM_TYPE_NR*smp_processor_id();
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(*(kmap_pte-idx)));
#endif
set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot));
local_flush_tlb_page(NULL, vaddr);
return (void *) vaddr;
}
EXPORT_SYMBOL(kmap_atomic_high_prot);
void kunmap_atomic_high(void *kvaddr)
{
unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
int type;
unsigned int idx;
if (vaddr < __fix_to_virt(FIX_KMAP_END))
return;
type = kmap_atomic_idx();
idx = type + KM_TYPE_NR * smp_processor_id();
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
#endif
/*
* force other mappings to Oops if they'll try to access
* this pte without first remap it
*/
pte_clear(&init_mm, vaddr, kmap_pte-idx);
local_flush_tlb_page(NULL, vaddr);
kmap_atomic_idx_pop();
}
EXPORT_SYMBOL(kunmap_atomic_high);

6
arch/microblaze/mm/init.c
View file

@ -49,17 +49,11 @@ unsigned long lowmem_size;
EXPORT_SYMBOL(min_low_pfn);
EXPORT_SYMBOL(max_low_pfn);
#ifdef CONFIG_HIGHMEM
pte_t *kmap_pte;
EXPORT_SYMBOL(kmap_pte);
static void __init highmem_init(void)
{
pr_debug("%x\n", (u32)PKMAP_BASE);
map_page(PKMAP_BASE, 0, 0); /* XXX gross */
pkmap_page_table = virt_to_kpte(PKMAP_BASE);
kmap_pte = virt_to_kpte(__fix_to_virt(FIX_KMAP_BEGIN));
}
static void highmem_setup(void)