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Message-ID: <ZBGU/wdcQLh5IlBH@kernel.org>
Date: Wed, 15 Mar 2023 11:50:55 +0200
From: Mike Rapoport <rppt@...nel.org>
To: "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc: linux-arch@...r.kernel.org, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Guo Ren <guoren@...nel.org>,
linux-csky@...r.kernel.org
Subject: Re: [PATCH v4 10/36] csky: Implement the new page table range API
On Wed, Mar 15, 2023 at 05:14:18AM +0000, Matthew Wilcox (Oracle) wrote:
> Add PFN_PTE_SHIFT, update_mmu_cache_range() and flush_dcache_folio().
> Change the PG_dcache_clean flag from being per-page to per-folio.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Acked-by: Guo Ren <guoren@...nel.org>
> Cc: linux-csky@...r.kernel.org
Acked-by: Mike Rapoport (IBM) <rppt@...nel.org>
> ---
> arch/csky/abiv1/cacheflush.c | 32 +++++++++++++++++-----------
> arch/csky/abiv1/inc/abi/cacheflush.h | 2 ++
> arch/csky/abiv2/cacheflush.c | 32 ++++++++++++++--------------
> arch/csky/abiv2/inc/abi/cacheflush.h | 10 +++++++--
> arch/csky/include/asm/pgtable.h | 8 ++++---
> 5 files changed, 50 insertions(+), 34 deletions(-)
>
> diff --git a/arch/csky/abiv1/cacheflush.c b/arch/csky/abiv1/cacheflush.c
> index fb91b069dc69..ba43f6c26b4f 100644
> --- a/arch/csky/abiv1/cacheflush.c
> +++ b/arch/csky/abiv1/cacheflush.c
> @@ -14,43 +14,49 @@
>
> #define PG_dcache_clean PG_arch_1
>
> -void flush_dcache_page(struct page *page)
> +void flush_dcache_folio(struct folio *folio)
> {
> struct address_space *mapping;
>
> - if (page == ZERO_PAGE(0))
> + if (is_zero_pfn(folio_pfn(folio)))
> return;
>
> - mapping = page_mapping_file(page);
> + mapping = folio_flush_mapping(folio);
>
> - if (mapping && !page_mapcount(page))
> - clear_bit(PG_dcache_clean, &page->flags);
> + if (mapping && !folio_mapped(folio))
> + clear_bit(PG_dcache_clean, &folio->flags);
> else {
> dcache_wbinv_all();
> if (mapping)
> icache_inv_all();
> - set_bit(PG_dcache_clean, &page->flags);
> + set_bit(PG_dcache_clean, &folio->flags);
> }
> }
> +EXPORT_SYMBOL(flush_dcache_folio);
> +
> +void flush_dcache_page(struct page *page)
> +{
> + flush_dcache_folio(page_folio(page));
> +}
> EXPORT_SYMBOL(flush_dcache_page);
>
> -void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
> - pte_t *ptep)
> +void update_mmu_cache_range(struct vm_area_struct *vma, unsigned long addr,
> + pte_t *ptep, unsigned int nr)
> {
> unsigned long pfn = pte_pfn(*ptep);
> - struct page *page;
> + struct folio *folio;
>
> if (!pfn_valid(pfn))
> return;
>
> - page = pfn_to_page(pfn);
> - if (page == ZERO_PAGE(0))
> + if (is_zero_pfn(pfn))
> return;
>
> - if (!test_and_set_bit(PG_dcache_clean, &page->flags))
> + folio = page_folio(pfn_to_page(pfn));
> + if (!test_and_set_bit(PG_dcache_clean, &folio->flags))
> dcache_wbinv_all();
>
> - if (page_mapping_file(page)) {
> + if (folio_flush_mapping(folio)) {
> if (vma->vm_flags & VM_EXEC)
> icache_inv_all();
> }
> diff --git a/arch/csky/abiv1/inc/abi/cacheflush.h b/arch/csky/abiv1/inc/abi/cacheflush.h
> index ed62e2066ba7..0d6cb65624c4 100644
> --- a/arch/csky/abiv1/inc/abi/cacheflush.h
> +++ b/arch/csky/abiv1/inc/abi/cacheflush.h
> @@ -9,6 +9,8 @@
>
> #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
> extern void flush_dcache_page(struct page *);
> +void flush_dcache_folio(struct folio *);
> +#define flush_dcache_folio flush_dcache_folio
>
> #define flush_cache_mm(mm) dcache_wbinv_all()
> #define flush_cache_page(vma, page, pfn) cache_wbinv_all()
> diff --git a/arch/csky/abiv2/cacheflush.c b/arch/csky/abiv2/cacheflush.c
> index 39c51399dd81..622e5b1b3f8a 100644
> --- a/arch/csky/abiv2/cacheflush.c
> +++ b/arch/csky/abiv2/cacheflush.c
> @@ -6,30 +6,30 @@
> #include <linux/mm.h>
> #include <asm/cache.h>
>
> -void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
> - pte_t *pte)
> +void update_mmu_cache_range(struct vm_area_struct *vma, unsigned long address,
> + pte_t *pte, unsigned int nr)
> {
> - unsigned long addr;
> - struct page *page;
> + unsigned long pfn = pte_pfn(*pte);
> + struct folio *folio;
> + unsigned int i;
>
> - if (!pfn_valid(pte_pfn(*pte)))
> + if (!pfn_valid(pfn) || is_zero_pfn(pfn))
> return;
>
> - page = pfn_to_page(pte_pfn(*pte));
> - if (page == ZERO_PAGE(0))
> - return;
> + folio = page_folio(pfn_to_page(pfn));
>
> - if (test_and_set_bit(PG_dcache_clean, &page->flags))
> + if (test_and_set_bit(PG_dcache_clean, &folio->flags))
> return;
>
> - addr = (unsigned long) kmap_atomic(page);
> -
> - dcache_wb_range(addr, addr + PAGE_SIZE);
> + for (i = 0; i < folio_nr_pages(folio); i++) {
> + unsigned long addr = (unsigned long) kmap_local_folio(folio,
> + i * PAGE_SIZE);
>
> - if (vma->vm_flags & VM_EXEC)
> - icache_inv_range(addr, addr + PAGE_SIZE);
> -
> - kunmap_atomic((void *) addr);
> + dcache_wb_range(addr, addr + PAGE_SIZE);
> + if (vma->vm_flags & VM_EXEC)
> + icache_inv_range(addr, addr + PAGE_SIZE);
> + kunmap_local((void *) addr);
> + }
> }
>
> void flush_icache_deferred(struct mm_struct *mm)
> diff --git a/arch/csky/abiv2/inc/abi/cacheflush.h b/arch/csky/abiv2/inc/abi/cacheflush.h
> index a565e00c3f70..9c728933a776 100644
> --- a/arch/csky/abiv2/inc/abi/cacheflush.h
> +++ b/arch/csky/abiv2/inc/abi/cacheflush.h
> @@ -18,11 +18,17 @@
>
> #define PG_dcache_clean PG_arch_1
>
> +static inline void flush_dcache_folio(struct folio *folio)
> +{
> + if (test_bit(PG_dcache_clean, &folio->flags))
> + clear_bit(PG_dcache_clean, &folio->flags);
> +}
> +#define flush_dcache_folio flush_dcache_folio
> +
> #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1
> static inline void flush_dcache_page(struct page *page)
> {
> - if (test_bit(PG_dcache_clean, &page->flags))
> - clear_bit(PG_dcache_clean, &page->flags);
> + flush_dcache_folio(page_folio(page));
> }
>
> #define flush_dcache_mmap_lock(mapping) do { } while (0)
> diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
> index d4042495febc..8cd27104f408 100644
> --- a/arch/csky/include/asm/pgtable.h
> +++ b/arch/csky/include/asm/pgtable.h
> @@ -28,6 +28,7 @@
> #define pgd_ERROR(e) \
> pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
>
> +#define PFN_PTE_SHIFT PAGE_SHIFT
> #define pmd_pfn(pmd) (pmd_phys(pmd) >> PAGE_SHIFT)
> #define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
> #define pte_clear(mm, addr, ptep) set_pte((ptep), \
> @@ -90,7 +91,6 @@ static inline void set_pte(pte_t *p, pte_t pte)
> /* prevent out of order excution */
> smp_mb();
> }
> -#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
>
> static inline pte_t *pmd_page_vaddr(pmd_t pmd)
> {
> @@ -263,8 +263,10 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
> extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
> extern void paging_init(void);
>
> -void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
> - pte_t *pte);
> +void update_mmu_cache_range(struct vm_area_struct *vma, unsigned long address,
> + pte_t *pte, unsigned int nr);
> +#define update_mmu_cache(vma, addr, ptep) \
> + update_mmu_cache_range(vma, addr, ptep, 1)
>
> #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
> remap_pfn_range(vma, vaddr, pfn, size, prot)
> --
> 2.39.2
>
>
--
Sincerely yours,
Mike.
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