Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752983AbaJYVPX (ORCPT ); Sat, 25 Oct 2014 17:15:23 -0400 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:39028 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752802AbaJYVPT (ORCPT ); Sat, 25 Oct 2014 17:15:19 -0400 From: "Aneesh Kumar K.V" To: akpm@linux-foundation.org, Steve Capper , Andrea Arcangeli , benh@kernel.crashing.org, mpe@ellerman.id.au Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-arch@vger.kernel.org, "Aneesh Kumar K.V" Subject: [PATCH V3 2/2] arch/powerpc: Switch to generic RCU get_user_pages_fast Date: Sat, 25 Oct 2014 16:14:20 +0530 Message-Id: <1414233860-7683-2-git-send-email-aneesh.kumar@linux.vnet.ibm.com> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1414233860-7683-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> References: <1414233860-7683-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 14102510-0021-0000-0000-00000067D78F Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch switch the ppc arch to use the generic RCU based gup implementation. Signed-off-by: Aneesh Kumar K.V --- arch/powerpc/Kconfig | 1 + arch/powerpc/include/asm/hugetlb.h | 8 +- arch/powerpc/include/asm/page.h | 3 +- arch/powerpc/include/asm/pgtable-ppc64.h | 1 - arch/powerpc/include/asm/pgtable.h | 5 - arch/powerpc/mm/Makefile | 2 +- arch/powerpc/mm/gup.c | 235 ------------------------------- arch/powerpc/mm/hugetlbpage.c | 27 ++-- 8 files changed, 21 insertions(+), 261 deletions(-) delete mode 100644 arch/powerpc/mm/gup.c diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 88eace4..7af887d 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -148,6 +148,7 @@ config PPC select HAVE_ARCH_AUDITSYSCALL select ARCH_SUPPORTS_ATOMIC_RMW select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN + select HAVE_GENERIC_RCU_GUP config GENERIC_CSUM def_bool CPU_LITTLE_ENDIAN diff --git a/arch/powerpc/include/asm/hugetlb.h b/arch/powerpc/include/asm/hugetlb.h index 766b77d..1d53a65 100644 --- a/arch/powerpc/include/asm/hugetlb.h +++ b/arch/powerpc/include/asm/hugetlb.h @@ -48,7 +48,7 @@ static inline unsigned int hugepd_shift(hugepd_t hpd) #endif /* CONFIG_PPC_BOOK3S_64 */ -static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr, +static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr, unsigned pdshift) { /* @@ -58,9 +58,9 @@ static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr, */ unsigned long idx = 0; - pte_t *dir = hugepd_page(*hpdp); + pte_t *dir = hugepd_page(hpd); #ifndef CONFIG_PPC_FSL_BOOK3E - idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(*hpdp); + idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd); #endif return dir + idx; @@ -193,7 +193,7 @@ static inline void flush_hugetlb_page(struct vm_area_struct *vma, } #define hugepd_shift(x) 0 -static inline pte_t *hugepte_offset(hugepd_t *hpdp, unsigned long addr, +static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr, unsigned pdshift) { return 0; diff --git a/arch/powerpc/include/asm/page.h b/arch/powerpc/include/asm/page.h index f973fce..69c0598 100644 --- a/arch/powerpc/include/asm/page.h +++ b/arch/powerpc/include/asm/page.h @@ -379,13 +379,14 @@ static inline int hugepd_ok(hugepd_t hpd) } #endif -#define is_hugepd(pdep) (hugepd_ok(*((hugepd_t *)(pdep)))) +#define is_hugepd(hpd) (hugepd_ok(hpd)) #define pgd_huge pgd_huge int pgd_huge(pgd_t pgd); #else /* CONFIG_HUGETLB_PAGE */ #define is_hugepd(pdep) 0 #define pgd_huge(pgd) 0 #endif /* CONFIG_HUGETLB_PAGE */ +#define __hugepd(x) ((hugepd_t) { (x) }) struct page; extern void clear_user_page(void *page, unsigned long vaddr, struct page *pg); diff --git a/arch/powerpc/include/asm/pgtable-ppc64.h b/arch/powerpc/include/asm/pgtable-ppc64.h index ae153c4..29c3624 100644 --- a/arch/powerpc/include/asm/pgtable-ppc64.h +++ b/arch/powerpc/include/asm/pgtable-ppc64.h @@ -575,6 +575,5 @@ static inline int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl, */ return true; } - #endif /* __ASSEMBLY__ */ #endif /* _ASM_POWERPC_PGTABLE_PPC64_H_ */ diff --git a/arch/powerpc/include/asm/pgtable.h b/arch/powerpc/include/asm/pgtable.h index 316f9a5..4a67c1d 100644 --- a/arch/powerpc/include/asm/pgtable.h +++ b/arch/powerpc/include/asm/pgtable.h @@ -274,11 +274,6 @@ extern void paging_init(void); */ extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t *); -extern int gup_hugepd(hugepd_t *hugepd, unsigned pdshift, unsigned long addr, - unsigned long end, int write, struct page **pages, int *nr); - -extern int gup_hugepte(pte_t *ptep, unsigned long sz, unsigned long addr, - unsigned long end, int write, struct page **pages, int *nr); #ifndef CONFIG_TRANSPARENT_HUGEPAGE #define pmd_large(pmd) 0 #define has_transparent_hugepage() 0 diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile index 325e861..438dcd3 100644 --- a/arch/powerpc/mm/Makefile +++ b/arch/powerpc/mm/Makefile @@ -6,7 +6,7 @@ subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror ccflags-$(CONFIG_PPC64) := $(NO_MINIMAL_TOC) -obj-y := fault.o mem.o pgtable.o gup.o mmap.o \ +obj-y := fault.o mem.o pgtable.o mmap.o \ init_$(CONFIG_WORD_SIZE).o \ pgtable_$(CONFIG_WORD_SIZE).o obj-$(CONFIG_PPC_MMU_NOHASH) += mmu_context_nohash.o tlb_nohash.o \ diff --git a/arch/powerpc/mm/gup.c b/arch/powerpc/mm/gup.c deleted file mode 100644 index d874668..0000000 --- a/arch/powerpc/mm/gup.c +++ /dev/null @@ -1,235 +0,0 @@ -/* - * Lockless get_user_pages_fast for powerpc - * - * Copyright (C) 2008 Nick Piggin - * Copyright (C) 2008 Novell Inc. - */ -#undef DEBUG - -#include -#include -#include -#include -#include -#include -#include - -#ifdef __HAVE_ARCH_PTE_SPECIAL - -/* - * The performance critical leaf functions are made noinline otherwise gcc - * inlines everything into a single function which results in too much - * register pressure. - */ -static noinline int gup_pte_range(pmd_t pmd, unsigned long addr, - unsigned long end, int write, struct page **pages, int *nr) -{ - unsigned long mask, result; - pte_t *ptep; - - result = _PAGE_PRESENT|_PAGE_USER; - if (write) - result |= _PAGE_RW; - mask = result | _PAGE_SPECIAL; - - ptep = pte_offset_kernel(&pmd, addr); - do { - pte_t pte = ACCESS_ONCE(*ptep); - struct page *page; - /* - * Similar to the PMD case, NUMA hinting must take slow path - */ - if (pte_numa(pte)) - return 0; - - if ((pte_val(pte) & mask) != result) - return 0; - VM_BUG_ON(!pfn_valid(pte_pfn(pte))); - page = pte_page(pte); - if (!page_cache_get_speculative(page)) - return 0; - if (unlikely(pte_val(pte) != pte_val(*ptep))) { - put_page(page); - return 0; - } - pages[*nr] = page; - (*nr)++; - - } while (ptep++, addr += PAGE_SIZE, addr != end); - - return 1; -} - -static int gup_pmd_range(pud_t pud, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) -{ - unsigned long next; - pmd_t *pmdp; - - pmdp = pmd_offset(&pud, addr); - do { - pmd_t pmd = ACCESS_ONCE(*pmdp); - - next = pmd_addr_end(addr, end); - /* - * If we find a splitting transparent hugepage we - * return zero. That will result in taking the slow - * path which will call wait_split_huge_page() - * if the pmd is still in splitting state - */ - if (pmd_none(pmd) || pmd_trans_splitting(pmd)) - return 0; - if (pmd_huge(pmd) || pmd_large(pmd)) { - /* - * NUMA hinting faults need to be handled in the GUP - * slowpath for accounting purposes and so that they - * can be serialised against THP migration. - */ - if (pmd_numa(pmd)) - return 0; - - if (!gup_hugepte((pte_t *)pmdp, PMD_SIZE, addr, next, - write, pages, nr)) - return 0; - } else if (is_hugepd(pmdp)) { - if (!gup_hugepd((hugepd_t *)pmdp, PMD_SHIFT, - addr, next, write, pages, nr)) - return 0; - } else if (!gup_pte_range(pmd, addr, next, write, pages, nr)) - return 0; - } while (pmdp++, addr = next, addr != end); - - return 1; -} - -static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) -{ - unsigned long next; - pud_t *pudp; - - pudp = pud_offset(&pgd, addr); - do { - pud_t pud = ACCESS_ONCE(*pudp); - - next = pud_addr_end(addr, end); - if (pud_none(pud)) - return 0; - if (pud_huge(pud)) { - if (!gup_hugepte((pte_t *)pudp, PUD_SIZE, addr, next, - write, pages, nr)) - return 0; - } else if (is_hugepd(pudp)) { - if (!gup_hugepd((hugepd_t *)pudp, PUD_SHIFT, - addr, next, write, pages, nr)) - return 0; - } else if (!gup_pmd_range(pud, addr, next, write, pages, nr)) - return 0; - } while (pudp++, addr = next, addr != end); - - return 1; -} - -int __get_user_pages_fast(unsigned long start, int nr_pages, int write, - struct page **pages) -{ - struct mm_struct *mm = current->mm; - unsigned long addr, len, end; - unsigned long next; - unsigned long flags; - pgd_t *pgdp; - int nr = 0; - - pr_devel("%s(%lx,%x,%s)\n", __func__, start, nr_pages, write ? "write" : "read"); - - start &= PAGE_MASK; - addr = start; - len = (unsigned long) nr_pages << PAGE_SHIFT; - end = start + len; - - if (unlikely(!access_ok(write ? VERIFY_WRITE : VERIFY_READ, - start, len))) - return 0; - - pr_devel(" aligned: %lx .. %lx\n", start, end); - - /* - * XXX: batch / limit 'nr', to avoid large irq off latency - * needs some instrumenting to determine the common sizes used by - * important workloads (eg. DB2), and whether limiting the batch size - * will decrease performance. - * - * It seems like we're in the clear for the moment. Direct-IO is - * the main guy that batches up lots of get_user_pages, and even - * they are limited to 64-at-a-time which is not so many. - */ - /* - * This doesn't prevent pagetable teardown, but does prevent - * the pagetables from being freed on powerpc. - * - * So long as we atomically load page table pointers versus teardown, - * we can follow the address down to the the page and take a ref on it. - */ - local_irq_save(flags); - - pgdp = pgd_offset(mm, addr); - do { - pgd_t pgd = ACCESS_ONCE(*pgdp); - - pr_devel(" %016lx: normal pgd %p\n", addr, - (void *)pgd_val(pgd)); - next = pgd_addr_end(addr, end); - if (pgd_none(pgd)) - break; - if (pgd_huge(pgd)) { - if (!gup_hugepte((pte_t *)pgdp, PGDIR_SIZE, addr, next, - write, pages, &nr)) - break; - } else if (is_hugepd(pgdp)) { - if (!gup_hugepd((hugepd_t *)pgdp, PGDIR_SHIFT, - addr, next, write, pages, &nr)) - break; - } else if (!gup_pud_range(pgd, addr, next, write, pages, &nr)) - break; - } while (pgdp++, addr = next, addr != end); - - local_irq_restore(flags); - - return nr; -} - -int get_user_pages_fast(unsigned long start, int nr_pages, int write, - struct page **pages) -{ - struct mm_struct *mm = current->mm; - int nr, ret; - - start &= PAGE_MASK; - nr = __get_user_pages_fast(start, nr_pages, write, pages); - ret = nr; - - if (nr < nr_pages) { - pr_devel(" slow path ! nr = %d\n", nr); - - /* Try to get the remaining pages with get_user_pages */ - start += nr << PAGE_SHIFT; - pages += nr; - - down_read(&mm->mmap_sem); - ret = get_user_pages(current, mm, start, - nr_pages - nr, write, 0, pages, NULL); - up_read(&mm->mmap_sem); - - /* Have to be a bit careful with return values */ - if (nr > 0) { - if (ret < 0) - ret = nr; - else - ret += nr; - } - } - - return ret; -} - -#endif /* __HAVE_ARCH_PTE_SPECIAL */ diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c index 7e70ae9..03342df 100644 --- a/arch/powerpc/mm/hugetlbpage.c +++ b/arch/powerpc/mm/hugetlbpage.c @@ -230,7 +230,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr, pdshift, pshift)) return NULL; - return hugepte_offset(hpdp, addr, pdshift); + return hugepte_offset(*hpdp, addr, pdshift); } #else @@ -270,7 +270,7 @@ pte_t *huge_pte_alloc(struct mm_struct *mm, unsigned long addr, unsigned long sz if (hugepd_none(*hpdp) && __hugepte_alloc(mm, hpdp, addr, pdshift, pshift)) return NULL; - return hugepte_offset(hpdp, addr, pdshift); + return hugepte_offset(*hpdp, addr, pdshift); } #endif @@ -538,7 +538,7 @@ static void hugetlb_free_pmd_range(struct mmu_gather *tlb, pud_t *pud, do { pmd = pmd_offset(pud, addr); next = pmd_addr_end(addr, end); - if (!is_hugepd(pmd)) { + if (!is_hugepd(__hugepd(pmd_val(*pmd)))) { /* * if it is not hugepd pointer, we should already find * it cleared. @@ -587,7 +587,7 @@ static void hugetlb_free_pud_range(struct mmu_gather *tlb, pgd_t *pgd, do { pud = pud_offset(pgd, addr); next = pud_addr_end(addr, end); - if (!is_hugepd(pud)) { + if (!is_hugepd(__hugepd(pud_val(*pud)))) { if (pud_none_or_clear_bad(pud)) continue; hugetlb_free_pmd_range(tlb, pud, addr, next, floor, @@ -653,7 +653,7 @@ void hugetlb_free_pgd_range(struct mmu_gather *tlb, do { next = pgd_addr_end(addr, end); pgd = pgd_offset(tlb->mm, addr); - if (!is_hugepd(pgd)) { + if (!is_hugepd(__hugepd(pgd_val(*pgd)))) { if (pgd_none_or_clear_bad(pgd)) continue; hugetlb_free_pud_range(tlb, pgd, addr, next, floor, ceiling); @@ -713,18 +713,17 @@ static unsigned long hugepte_addr_end(unsigned long addr, unsigned long end, return (__boundary - 1 < end - 1) ? __boundary : end; } -int gup_hugepd(hugepd_t *hugepd, unsigned pdshift, - unsigned long addr, unsigned long end, - int write, struct page **pages, int *nr) +int gup_huge_pd(hugepd_t hugepd, unsigned long addr, unsigned pdshift, + unsigned long end, int write, struct page **pages, int *nr) { pte_t *ptep; - unsigned long sz = 1UL << hugepd_shift(*hugepd); + unsigned long sz = 1UL << hugepd_shift(hugepd); unsigned long next; ptep = hugepte_offset(hugepd, addr, pdshift); do { next = hugepte_addr_end(addr, end, sz); - if (!gup_hugepte(ptep, sz, addr, end, write, pages, nr)) + if (!gup_huge_pte(*ptep, ptep, addr, sz, end, write, pages, nr)) return 0; } while (ptep++, addr = next, addr != end); @@ -961,7 +960,7 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift else if (pgd_huge(pgd)) { ret_pte = (pte_t *) pgdp; goto out; - } else if (is_hugepd(&pgd)) + } else if (is_hugepd(__hugepd(pgd_val(pgd)))) hpdp = (hugepd_t *)&pgd; else { /* @@ -978,7 +977,7 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift else if (pud_huge(pud)) { ret_pte = (pte_t *) pudp; goto out; - } else if (is_hugepd(&pud)) + } else if (is_hugepd(__hugepd(pud_val(pud)))) hpdp = (hugepd_t *)&pud; else { pdshift = PMD_SHIFT; @@ -999,7 +998,7 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift if (pmd_huge(pmd) || pmd_large(pmd)) { ret_pte = (pte_t *) pmdp; goto out; - } else if (is_hugepd(&pmd)) + } else if (is_hugepd(__hugepd(pmd_val(pmd)))) hpdp = (hugepd_t *)&pmd; else return pte_offset_kernel(&pmd, ea); @@ -1008,7 +1007,7 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift if (!hpdp) return NULL; - ret_pte = hugepte_offset(hpdp, ea, pdshift); + ret_pte = hugepte_offset(*hpdp, ea, pdshift); pdshift = hugepd_shift(*hpdp); out: if (shift) -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/