mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 13:35:09 +07:00
525aaf9bad
The kmap code for all the architectures is almost 100% identical. Lift the common code to the core. Use ARCH_HAS_KMAP_FLUSH_TLB to indicate if an arch defines kmap_flush_tlb() and call if if needed. This also has the benefit of changing kmap() on a number of architectures to be an inline call rather than an actual function. Signed-off-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Christian König <christian.koenig@amd.com> Cc: Chris Zankel <chris@zankel.net> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Helge Deller <deller@gmx.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20200507150004.1423069-4-ira.weiny@intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/compiler.h>
|
|
#include <linux/init.h>
|
|
#include <linux/export.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/smp.h>
|
|
#include <asm/fixmap.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
static pte_t *kmap_pte;
|
|
|
|
unsigned long highstart_pfn, highend_pfn;
|
|
|
|
void kmap_flush_tlb(unsigned long addr)
|
|
{
|
|
flush_tlb_one(addr);
|
|
}
|
|
EXPORT_SYMBOL(kmap_flush_tlb);
|
|
|
|
void kunmap(struct page *page)
|
|
{
|
|
might_sleep();
|
|
if (!PageHighMem(page))
|
|
return;
|
|
kunmap_high(page);
|
|
}
|
|
EXPORT_SYMBOL(kunmap);
|
|
|
|
/*
|
|
* kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because
|
|
* no global lock is needed and because the kmap code must perform a global TLB
|
|
* invalidation when the kmap pool wraps.
|
|
*
|
|
* However when holding an atomic kmap is is not legal to sleep, so atomic
|
|
* kmaps are appropriate for short, tight code paths only.
|
|
*/
|
|
|
|
void *kmap_atomic(struct page *page)
|
|
{
|
|
unsigned long vaddr;
|
|
int idx, type;
|
|
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
if (!PageHighMem(page))
|
|
return page_address(page);
|
|
|
|
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(kmap_pte-idx, mk_pte(page, PAGE_KERNEL));
|
|
local_flush_tlb_one((unsigned long)vaddr);
|
|
|
|
return (void*) vaddr;
|
|
}
|
|
EXPORT_SYMBOL(kmap_atomic);
|
|
|
|
void __kunmap_atomic(void *kvaddr)
|
|
{
|
|
unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
|
|
int type __maybe_unused;
|
|
|
|
if (vaddr < FIXADDR_START) { // FIXME
|
|
pagefault_enable();
|
|
preempt_enable();
|
|
return;
|
|
}
|
|
|
|
type = kmap_atomic_idx();
|
|
#ifdef CONFIG_DEBUG_HIGHMEM
|
|
{
|
|
int idx = type + KM_TYPE_NR * smp_processor_id();
|
|
|
|
BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
|
|
|
|
/*
|
|
* 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_one(vaddr);
|
|
}
|
|
#endif
|
|
kmap_atomic_idx_pop();
|
|
pagefault_enable();
|
|
preempt_enable();
|
|
}
|
|
EXPORT_SYMBOL(__kunmap_atomic);
|
|
|
|
/*
|
|
* This is the same as kmap_atomic() but can map memory that doesn't
|
|
* have a struct page associated with it.
|
|
*/
|
|
void *kmap_atomic_pfn(unsigned long pfn)
|
|
{
|
|
unsigned long vaddr;
|
|
int idx, type;
|
|
|
|
preempt_disable();
|
|
pagefault_disable();
|
|
|
|
type = kmap_atomic_idx_push();
|
|
idx = type + KM_TYPE_NR*smp_processor_id();
|
|
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
|
|
set_pte(kmap_pte-idx, pfn_pte(pfn, PAGE_KERNEL));
|
|
flush_tlb_one(vaddr);
|
|
|
|
return (void*) vaddr;
|
|
}
|
|
|
|
void __init kmap_init(void)
|
|
{
|
|
unsigned long kmap_vstart;
|
|
|
|
/* cache the first kmap pte */
|
|
kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
|
|
kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
|
|
}
|