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sh: implement the new page table range API 

Add PFN_PTE_SHIFT, update_mmu_cache_range(), flush_dcache_folio() and
flush_icache_pages().  Change the PG_dcache_clean flag from being per-page
to per-folio.  Flush the entire folio containing the pages in
flush_icache_pages() for ease of implementation.

Link: https://lkml.kernel.org/r/20230802151406.3735276-25-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: Rich Felker <dalias@libc.org>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-08-02 16:13:52 +01:00 committed by Andrew Morton
parent 843f9310e0
commit 157efa2904
8 changed files with 89 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
arch/sh/include/asm/cacheflush.h
View File

@ -13,9 +13,9 @@
* - flush_cache_page(mm, vmaddr, pfn) flushes a single page
* - flush_cache_range(vma, start, end) flushes a range of pages
*
* - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
* - flush_dcache_folio(folio) flushes(wback&invalidates) a folio for dcache
* - flush_icache_range(start, end) flushes(invalidates) a range for icache
* - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
* - flush_icache_pages(vma, pg, nr) flushes(invalidates) pages for icache
* - flush_cache_sigtramp(vaddr) flushes the signal trampoline
*/
extern void (*local_flush_cache_all)(void *args);
@ -23,9 +23,9 @@ extern void (*local_flush_cache_mm)(void *args);
extern void (*local_flush_cache_dup_mm)(void *args);
extern void (*local_flush_cache_page)(void *args);
extern void (*local_flush_cache_range)(void *args);
extern void (*local_flush_dcache_page)(void *args);
extern void (*local_flush_dcache_folio)(void *args);
extern void (*local_flush_icache_range)(void *args);
extern void (*local_flush_icache_page)(void *args);
extern void (*local_flush_icache_folio)(void *args);
extern void (*local_flush_cache_sigtramp)(void *args);
static inline void cache_noop(void *args) { }
@ -42,11 +42,18 @@ extern void flush_cache_page(struct vm_area_struct *vma,
extern void flush_cache_range(struct vm_area_struct *vma,
unsigned long start, unsigned long end);
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
void flush_dcache_page(struct page *page);
void flush_dcache_folio(struct folio *folio);
#define flush_dcache_folio flush_dcache_folio
static inline void flush_dcache_page(struct page *page)
{
flush_dcache_folio(page_folio(page));
}
extern void flush_icache_range(unsigned long start, unsigned long end);
#define flush_icache_user_range flush_icache_range
extern void flush_icache_page(struct vm_area_struct *vma,
struct page *page);
void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
unsigned int nr);
#define flush_icache_page(vma, page) flush_icache_pages(vma, page, 1)
extern void flush_cache_sigtramp(unsigned long address);
struct flusher_data {

7
arch/sh/include/asm/pgtable.h
View File

@ -102,13 +102,16 @@ extern void __update_cache(struct vm_area_struct *vma,
extern void __update_tlb(struct vm_area_struct *vma,
unsigned long address, pte_t pte);
static inline void
update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
static inline void update_mmu_cache_range(struct vm_fault *vmf,
struct vm_area_struct *vma, unsigned long address,
pte_t *ptep, unsigned int nr)
{
pte_t pte = *ptep;
__update_cache(vma, address, pte);
__update_tlb(vma, address, pte);
}
#define update_mmu_cache(vma, addr, ptep) \
update_mmu_cache_range(NULL, vma, addr, ptep, 1)
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern void paging_init(void);

5
arch/sh/include/asm/pgtable_32.h
View File

@ -307,14 +307,13 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
#endif
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
/*
* (pmds are folded into pgds so this doesn't get actually called,
* but the define is needed for a generic inline function.)
*/
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
#define PFN_PTE_SHIFT PAGE_SHIFT
#define pfn_pte(pfn, prot) \
__pte(((unsigned long long)(pfn) << PAGE_SHIFT) | pgprot_val(prot))
#define pfn_pmd(pfn, prot) \
@ -323,7 +322,7 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
#define pte_none(x) (!pte_val(x))
#define pte_present(x) ((x).pte_low & (_PAGE_PRESENT | _PAGE_PROTNONE))
#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
#define pte_clear(mm, addr, ptep) set_pte(ptep, __pte(0))
#define pmd_none(x) (!pmd_val(x))
#define pmd_present(x) (pmd_val(x))

4
arch/sh/mm/cache-j2.c
View File

@ -55,9 +55,9 @@ void __init j2_cache_init(void)
local_flush_cache_dup_mm = j2_flush_both;
local_flush_cache_page = j2_flush_both;
local_flush_cache_range = j2_flush_both;
local_flush_dcache_page = j2_flush_dcache;
local_flush_dcache_folio = j2_flush_dcache;
local_flush_icache_range = j2_flush_icache;
local_flush_icache_page = j2_flush_icache;
local_flush_icache_folio = j2_flush_icache;
local_flush_cache_sigtramp = j2_flush_icache;
pr_info("Initial J2 CCR is %.8x\n", __raw_readl(j2_ccr_base));

26
arch/sh/mm/cache-sh4.c
View File

@ -107,19 +107,29 @@ static inline void flush_cache_one(unsigned long start, unsigned long phys)
* Write back & invalidate the D-cache of the page.
* (To avoid "alias" issues)
*/
static void sh4_flush_dcache_page(void *arg)
static void sh4_flush_dcache_folio(void *arg)
{
struct page *page = arg;
unsigned long addr = (unsigned long)page_address(page);
struct folio *folio = arg;
#ifndef CONFIG_SMP
struct address_space *mapping = page_mapping_file(page);
struct address_space *mapping = folio_flush_mapping(folio);
if (mapping && !mapping_mapped(mapping))
clear_bit(PG_dcache_clean, &page->flags);
clear_bit(PG_dcache_clean, &folio->flags);
else
#endif
flush_cache_one(CACHE_OC_ADDRESS_ARRAY |
(addr & shm_align_mask), page_to_phys(page));
{
unsigned long pfn = folio_pfn(folio);
unsigned long addr = (unsigned long)folio_address(folio);
unsigned int i, nr = folio_nr_pages(folio);
for (i = 0; i < nr; i++) {
flush_cache_one(CACHE_OC_ADDRESS_ARRAY |
(addr & shm_align_mask),
pfn * PAGE_SIZE);
addr += PAGE_SIZE;
pfn++;
}
}
wmb();
}
@ -379,7 +389,7 @@ void __init sh4_cache_init(void)
__raw_readl(CCN_PRR));
local_flush_icache_range = sh4_flush_icache_range;
local_flush_dcache_page = sh4_flush_dcache_page;
local_flush_dcache_folio = sh4_flush_dcache_folio;
local_flush_cache_all = sh4_flush_cache_all;
local_flush_cache_mm = sh4_flush_cache_mm;
local_flush_cache_dup_mm = sh4_flush_cache_mm;

26
arch/sh/mm/cache-sh7705.c
View File

@ -132,15 +132,20 @@ static void __flush_dcache_page(unsigned long phys)
* Write back & invalidate the D-cache of the page.
* (To avoid "alias" issues)
*/
static void sh7705_flush_dcache_page(void *arg)
static void sh7705_flush_dcache_folio(void *arg)
{
struct page *page = arg;
struct address_space *mapping = page_mapping_file(page);
struct folio *folio = arg;
struct address_space *mapping = folio_flush_mapping(folio);
if (mapping && !mapping_mapped(mapping))
clear_bit(PG_dcache_clean, &page->flags);
else
__flush_dcache_page(__pa(page_address(page)));
clear_bit(PG_dcache_clean, &folio->flags);
else {
unsigned long pfn = folio_pfn(folio);
unsigned int i, nr = folio_nr_pages(folio);
for (i = 0; i < nr; i++)
__flush_dcache_page((pfn + i) * PAGE_SIZE);
}
}
static void sh7705_flush_cache_all(void *args)
@ -176,19 +181,20 @@ static void sh7705_flush_cache_page(void *args)
* Not entirely sure why this is necessary on SH3 with 32K cache but
* without it we get occasional "Memory fault" when loading a program.
*/
static void sh7705_flush_icache_page(void *page)
static void sh7705_flush_icache_folio(void *arg)
{
__flush_purge_region(page_address(page), PAGE_SIZE);
struct folio *folio = arg;
__flush_purge_region(folio_address(folio), folio_size(folio));
}
void __init sh7705_cache_init(void)
{
local_flush_icache_range = sh7705_flush_icache_range;
local_flush_dcache_page = sh7705_flush_dcache_page;
local_flush_dcache_folio = sh7705_flush_dcache_folio;
local_flush_cache_all = sh7705_flush_cache_all;
local_flush_cache_mm = sh7705_flush_cache_all;
local_flush_cache_dup_mm = sh7705_flush_cache_all;
local_flush_cache_range = sh7705_flush_cache_all;
local_flush_cache_page = sh7705_flush_cache_page;
local_flush_icache_page = sh7705_flush_icache_page;
local_flush_icache_folio = sh7705_flush_icache_folio;
}

52
arch/sh/mm/cache.c
View File

@ -20,9 +20,9 @@ void (*local_flush_cache_mm)(void *args) = cache_noop;
void (*local_flush_cache_dup_mm)(void *args) = cache_noop;
void (*local_flush_cache_page)(void *args) = cache_noop;
void (*local_flush_cache_range)(void *args) = cache_noop;
void (*local_flush_dcache_page)(void *args) = cache_noop;
void (*local_flush_dcache_folio)(void *args) = cache_noop;
void (*local_flush_icache_range)(void *args) = cache_noop;
void (*local_flush_icache_page)(void *args) = cache_noop;
void (*local_flush_icache_folio)(void *args) = cache_noop;
void (*local_flush_cache_sigtramp)(void *args) = cache_noop;
void (*__flush_wback_region)(void *start, int size);
@ -61,15 +61,17 @@ void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long vaddr, void *dst, const void *src,
unsigned long len)
{
if (boot_cpu_data.dcache.n_aliases && page_mapcount(page) &&
test_bit(PG_dcache_clean, &page->flags)) {
struct folio *folio = page_folio(page);
if (boot_cpu_data.dcache.n_aliases && folio_mapped(folio) &&
test_bit(PG_dcache_clean, &folio->flags)) {
void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
memcpy(vto, src, len);
kunmap_coherent(vto);
} else {
memcpy(dst, src, len);
if (boot_cpu_data.dcache.n_aliases)
clear_bit(PG_dcache_clean, &page->flags);
clear_bit(PG_dcache_clean, &folio->flags);
}
if (vma->vm_flags & VM_EXEC)
@ -80,27 +82,30 @@ void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
unsigned long vaddr, void *dst, const void *src,
unsigned long len)
{
struct folio *folio = page_folio(page);
if (boot_cpu_data.dcache.n_aliases && page_mapcount(page) &&
test_bit(PG_dcache_clean, &page->flags)) {
test_bit(PG_dcache_clean, &folio->flags)) {
void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
memcpy(dst, vfrom, len);
kunmap_coherent(vfrom);
} else {
memcpy(dst, src, len);
if (boot_cpu_data.dcache.n_aliases)
clear_bit(PG_dcache_clean, &page->flags);
clear_bit(PG_dcache_clean, &folio->flags);
}
}
void copy_user_highpage(struct page *to, struct page *from,
unsigned long vaddr, struct vm_area_struct *vma)
{
struct folio *src = page_folio(from);
void *vfrom, *vto;
vto = kmap_atomic(to);
if (boot_cpu_data.dcache.n_aliases && page_mapcount(from) &&
test_bit(PG_dcache_clean, &from->flags)) {
if (boot_cpu_data.dcache.n_aliases && folio_mapped(src) &&
test_bit(PG_dcache_clean, &src->flags)) {
vfrom = kmap_coherent(from, vaddr);
copy_page(vto, vfrom);
kunmap_coherent(vfrom);
@ -136,27 +141,28 @@ EXPORT_SYMBOL(clear_user_highpage);
void __update_cache(struct vm_area_struct *vma,
unsigned long address, pte_t pte)
{
struct page *page;
unsigned long pfn = pte_pfn(pte);
if (!boot_cpu_data.dcache.n_aliases)
return;
page = pfn_to_page(pfn);
if (pfn_valid(pfn)) {
int dirty = !test_and_set_bit(PG_dcache_clean, &page->flags);
struct folio *folio = page_folio(pfn_to_page(pfn));
int dirty = !test_and_set_bit(PG_dcache_clean, &folio->flags);
if (dirty)
__flush_purge_region(page_address(page), PAGE_SIZE);
__flush_purge_region(folio_address(folio),
folio_size(folio));
}
}
void __flush_anon_page(struct page *page, unsigned long vmaddr)
{
struct folio *folio = page_folio(page);
unsigned long addr = (unsigned long) page_address(page);
if (pages_do_alias(addr, vmaddr)) {
if (boot_cpu_data.dcache.n_aliases && page_mapcount(page) &&
test_bit(PG_dcache_clean, &page->flags)) {
if (boot_cpu_data.dcache.n_aliases && folio_mapped(folio) &&
test_bit(PG_dcache_clean, &folio->flags)) {
void *kaddr;
kaddr = kmap_coherent(page, vmaddr);
@ -164,7 +170,8 @@ void __flush_anon_page(struct page *page, unsigned long vmaddr)
/* __flush_purge_region((void *)kaddr, PAGE_SIZE); */
kunmap_coherent(kaddr);
} else
__flush_purge_region((void *)addr, PAGE_SIZE);
__flush_purge_region(folio_address(folio),
folio_size(folio));
}
}
@ -215,11 +222,11 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
}
EXPORT_SYMBOL(flush_cache_range);
void flush_dcache_page(struct page *page)
void flush_dcache_folio(struct folio *folio)
{
cacheop_on_each_cpu(local_flush_dcache_page, page, 1);
cacheop_on_each_cpu(local_flush_dcache_folio, folio, 1);
}
EXPORT_SYMBOL(flush_dcache_page);
EXPORT_SYMBOL(flush_dcache_folio);
void flush_icache_range(unsigned long start, unsigned long end)
{
@ -233,10 +240,11 @@ void flush_icache_range(unsigned long start, unsigned long end)
}
EXPORT_SYMBOL(flush_icache_range);
void flush_icache_page(struct vm_area_struct *vma, struct page *page)
void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
unsigned int nr)
{
/* Nothing uses the VMA, so just pass the struct page along */
cacheop_on_each_cpu(local_flush_icache_page, page, 1);
/* Nothing uses the VMA, so just pass the folio along */
cacheop_on_each_cpu(local_flush_icache_folio, page_folio(page), 1);
}
void flush_cache_sigtramp(unsigned long address)

3
arch/sh/mm/kmap.c
View File

@ -27,10 +27,11 @@ void __init kmap_coherent_init(void)
void *kmap_coherent(struct page *page, unsigned long addr)
{
struct folio *folio = page_folio(page);
enum fixed_addresses idx;
unsigned long vaddr;
BUG_ON(!test_bit(PG_dcache_clean, &page->flags));
BUG_ON(!test_bit(PG_dcache_clean, &folio->flags));
preempt_disable();
pagefault_disable();