Release 4.11 arch/arm/mm/highmem.c
/*
* arch/arm/mm/highmem.c -- ARM highmem support
*
* Author: Nicolas Pitre
* Created: september 8, 2008
* Copyright: Marvell Semiconductors Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/highmem.h>
#include <linux/interrupt.h>
#include <asm/fixmap.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include "mm.h"
static inline void set_fixmap_pte(int idx, pte_t pte)
{
unsigned long vaddr = __fix_to_virt(idx);
pte_t *ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
set_pte_ext(ptep, pte, 0);
local_flush_tlb_kernel_page(vaddr);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Liu Hua | 35 | 70.00% | 1 | 50.00% |
| Rob Herring | 15 | 30.00% | 1 | 50.00% |
| Total | 50 | 100.00% | 2 | 100.00% |
static inline pte_t get_fixmap_pte(unsigned long vaddr)
{
pte_t *ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
return *ptep;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Liu Hua | 19 | 65.52% | 1 | 50.00% |
| Rob Herring | 10 | 34.48% | 1 | 50.00% |
| Total | 29 | 100.00% | 2 | 100.00% |
void *kmap(struct page *page)
{
might_sleep();
if (!PageHighMem(page))
return page_address(page);
return kmap_high(page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nico Pitre | 34 | 100.00% | 1 | 100.00% |
| Total | 34 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL(kmap);
void kunmap(struct page *page)
{
BUG_ON(in_interrupt());
if (!PageHighMem(page))
return;
kunmap_high(page);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nico Pitre | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL(kunmap);
void *kmap_atomic(struct page *page)
{
unsigned int idx;
unsigned long vaddr;
void *kmap;
int type;
preempt_disable();
pagefault_disable();
if (!PageHighMem(page))
return page_address(page);
#ifdef CONFIG_DEBUG_HIGHMEM
/*
* There is no cache coherency issue when non VIVT, so force the
* dedicated kmap usage for better debugging purposes in that case.
*/
if (!cache_is_vivt())
kmap = NULL;
else
#endif
kmap = kmap_high_get(page);
if (kmap)
return kmap;
type = kmap_atomic_idx_push();
idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
vaddr = __fix_to_virt(idx);
#ifdef CONFIG_DEBUG_HIGHMEM
/*
* With debugging enabled, kunmap_atomic forces that entry to 0.
* Make sure it was indeed properly unmapped.
*/
BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
#endif
/*
* When debugging is off, kunmap_atomic leaves the previous mapping
* in place, so the contained TLB flush ensures the TLB is updated
* with the new mapping.
*/
set_fixmap_pte(idx, mk_pte(page, kmap_prot));
return (void *)vaddr;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nico Pitre | 117 | 84.78% | 3 | 30.00% |
| Peter Zijlstra | 8 | 5.80% | 1 | 10.00% |
| Rob Herring | 4 | 2.90% | 1 | 10.00% |
| David Hildenbrand | 3 | 2.17% | 1 | 10.00% |
| Liu Hua | 2 | 1.45% | 1 | 10.00% |
| Stefan Agner | 2 | 1.45% | 1 | 10.00% |
| Russell King | 1 | 0.72% | 1 | 10.00% |
| Américo Wang | 1 | 0.72% | 1 | 10.00% |
| Total | 138 | 100.00% | 10 | 100.00% |
EXPORT_SYMBOL(kmap_atomic);
void __kunmap_atomic(void *kvaddr)
{
unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
int idx, type;
if (kvaddr >= (void *)FIXADDR_START) {
type = kmap_atomic_idx();
idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
if (cache_is_vivt())
__cpuc_flush_dcache_area((void *)vaddr, PAGE_SIZE);
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(vaddr != __fix_to_virt(idx));
set_fixmap_pte(idx, __pte(0));
#else
(void) idx; /* to kill a warning */
#endif
kmap_atomic_idx_pop();
} else if (vaddr >= PKMAP_ADDR(0) && vaddr < PKMAP_ADDR(LAST_PKMAP)) {
/* this address was obtained through kmap_high_get() */
kunmap_high(pte_page(pkmap_page_table[PKMAP_NR(vaddr)]));
}
pagefault_enable();
preempt_enable();
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nico Pitre | 117 | 80.14% | 3 | 33.33% |
| Peter Zijlstra | 19 | 13.01% | 2 | 22.22% |
| David Hildenbrand | 3 | 2.05% | 1 | 11.11% |
| Russell King | 3 | 2.05% | 1 | 11.11% |
| Stefan Agner | 2 | 1.37% | 1 | 11.11% |
| Liu Hua | 2 | 1.37% | 1 | 11.11% |
| Total | 146 | 100.00% | 9 | 100.00% |
EXPORT_SYMBOL(__kunmap_atomic);
void *kmap_atomic_pfn(unsigned long pfn)
{
unsigned long vaddr;
int idx, type;
struct page *page = pfn_to_page(pfn);
preempt_disable();
pagefault_disable();
if (!PageHighMem(page))
return page_address(page);
type = kmap_atomic_idx_push();
idx = FIX_KMAP_BEGIN + type + KM_TYPE_NR * smp_processor_id();
vaddr = __fix_to_virt(idx);
#ifdef CONFIG_DEBUG_HIGHMEM
BUG_ON(!pte_none(get_fixmap_pte(vaddr)));
#endif
set_fixmap_pte(idx, pfn_pte(pfn, kmap_prot));
return (void *)vaddr;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nico Pitre | 63 | 58.33% | 1 | 14.29% |
| Thomas Petazzoni | 24 | 22.22% | 1 | 14.29% |
| Peter Zijlstra | 10 | 9.26% | 1 | 14.29% |
| Rob Herring | 4 | 3.70% | 1 | 14.29% |
| David Hildenbrand | 3 | 2.78% | 1 | 14.29% |
| Stefan Agner | 2 | 1.85% | 1 | 14.29% |
| Liu Hua | 2 | 1.85% | 1 | 14.29% |
| Total | 108 | 100.00% | 7 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Nico Pitre | 401 | 69.50% | 4 | 28.57% |
| Liu Hua | 60 | 10.40% | 1 | 7.14% |
| Peter Zijlstra | 38 | 6.59% | 2 | 14.29% |
| Rob Herring | 33 | 5.72% | 1 | 7.14% |
| Thomas Petazzoni | 24 | 4.16% | 1 | 7.14% |
| David Hildenbrand | 9 | 1.56% | 1 | 7.14% |
| Stefan Agner | 6 | 1.04% | 1 | 7.14% |
| Russell King | 4 | 0.69% | 2 | 14.29% |
| Américo Wang | 2 | 0.35% | 1 | 7.14% |
| Total | 577 | 100.00% | 14 | 100.00% |
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