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Sat, 10 Apr 2021 02:57:30 -0700 (PDT) From: Pingfan Liu To: linux-arm-kernel@lists.infradead.org Cc: Pingfan Liu , Catalin Marinas , Will Deacon , Marc Zyngier , Kristina Martsenko , James Morse , Steven Price , Jonathan Cameron , Pavel Tatashin , Anshuman Khandual , Atish Patra , Mike Rapoport , Logan Gunthorpe , Mark Brown Subject: [RFC 4/8] arm64/mm: enable __create_pgd_mapping() to run across different pgtable Date: Sat, 10 Apr 2021 17:56:50 +0800 Message-Id: <20210410095654.24102-5-kernelfans@gmail.com> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210410095654.24102-1-kernelfans@gmail.com> References: <20210410095654.24102-1-kernelfans@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210410_025731_533991_408BBD87 X-CRM114-Status: GOOD ( 14.36 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org PUP/PMD/PTE fixmap can not be shared across different pgtable concurrently. Also change the return type from phys_addr_t to unsigned long, since allocator may return virtual address directly. Signed-off-by: Pingfan Liu Cc: Catalin Marinas Cc: Will Deacon Cc: Marc Zyngier Cc: Kristina Martsenko Cc: James Morse Cc: Steven Price Cc: Jonathan Cameron Cc: Pavel Tatashin Cc: Anshuman Khandual Cc: Atish Patra Cc: Mike Rapoport Cc: Logan Gunthorpe Cc: Mark Brown To: linux-arm-kernel@lists.infradead.org --- arch/arm64/include/asm/pgalloc.h | 6 +++++- arch/arm64/mm/mmu.c | 6 +++--- arch/arm64/mm/mmu_include.c | 31 ++++++++++++++++++++----------- 3 files changed, 28 insertions(+), 15 deletions(-) diff --git a/arch/arm64/include/asm/pgalloc.h b/arch/arm64/include/asm/pgalloc.h index 42f602528b90..6e9f1e218300 100644 --- a/arch/arm64/include/asm/pgalloc.h +++ b/arch/arm64/include/asm/pgalloc.h @@ -83,7 +83,7 @@ pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep) } #define pmd_pgtable(pmd) pmd_page(pmd) -typedef phys_addr_t (*pgtable_alloc)(unsigned long shift, void *data); +typedef unsigned long (*pgtable_alloc)(unsigned long shift, void *data); extern void __create_pgd_mapping_extend(pgd_t *pgdir, unsigned int entries_cnt, phys_addr_t phys, @@ -93,4 +93,8 @@ extern void __create_pgd_mapping_extend(pgd_t *pgdir, void *info, int flags); +#define NO_BLOCK_MAPPINGS BIT(0) +#define NO_CONT_MAPPINGS BIT(1) +#define NO_FIXMAP BIT(2) + #endif diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 0f183aaf98c9..628752c3cfd0 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -86,7 +86,7 @@ pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, } EXPORT_SYMBOL(phys_mem_access_prot); -static phys_addr_t __init early_pgtable_alloc(unsigned long unused_a, void *unused_b) +static unsigned long __init early_pgtable_alloc(unsigned long unused_a, void *unused_b) { phys_addr_t phys; void *ptr; @@ -113,7 +113,7 @@ static phys_addr_t __init early_pgtable_alloc(unsigned long unused_a, void *unus return phys; } -static phys_addr_t __pgd_pgtable_alloc(unsigned long unused_a, void *unused_b) +static unsigned long __pgd_pgtable_alloc(unsigned long unused_a, void *unused_b) { void *ptr = (void *)__get_free_page(GFP_PGTABLE_KERNEL); BUG_ON(!ptr); @@ -123,7 +123,7 @@ static phys_addr_t __pgd_pgtable_alloc(unsigned long unused_a, void *unused_b) return __pa(ptr); } -static phys_addr_t pgd_pgtable_alloc(unsigned long shift, void *unused) +static unsigned long pgd_pgtable_alloc(unsigned long shift, void *unused) { phys_addr_t pa = __pgd_pgtable_alloc(shift, unused); diff --git a/arch/arm64/mm/mmu_include.c b/arch/arm64/mm/mmu_include.c index 371afc7d4502..adad0f93cd53 100644 --- a/arch/arm64/mm/mmu_include.c +++ b/arch/arm64/mm/mmu_include.c @@ -1,8 +1,5 @@ // SPDX-License-Identifier: GPL-2.0-only -#define NO_BLOCK_MAPPINGS BIT(0) -#define NO_CONT_MAPPINGS BIT(1) - static bool pgattr_change_is_safe(u64 old, u64 new) { /* @@ -38,11 +35,14 @@ static bool pgattr_change_is_safe(u64 old, u64 new) } static void init_pte(pmd_t *pmdp, unsigned long addr, unsigned long end, - phys_addr_t phys, pgprot_t prot) + phys_addr_t phys, pgprot_t prot, int flags) { pte_t *ptep; - ptep = pte_set_fixmap_offset(pmdp, addr); + if (likely(!(flags & NO_FIXMAP))) + ptep = pte_set_fixmap_offset(pmdp, addr); + else + ptep = pte_offset_kernel(pmdp, addr); do { pte_t old_pte = READ_ONCE(*ptep); @@ -58,7 +58,8 @@ static void init_pte(pmd_t *pmdp, unsigned long addr, unsigned long end, phys += PAGE_SIZE; } while (ptep++, addr += PAGE_SIZE, addr != end); - pte_clear_fixmap(); + if (likely(!(flags & NO_FIXMAP))) + pte_clear_fixmap(); } static void alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr, @@ -91,7 +92,7 @@ static void alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr, (flags & NO_CONT_MAPPINGS) == 0) __prot = __pgprot(pgprot_val(prot) | PTE_CONT); - init_pte(pmdp, addr, next, phys, __prot); + init_pte(pmdp, addr, next, phys, __prot, flags); phys += next - addr; } while (addr = next, addr != end); @@ -106,7 +107,10 @@ static void init_pmd(pud_t *pudp, unsigned long addr, unsigned long end, unsigned long next; pmd_t *pmdp; - pmdp = pmd_set_fixmap_offset(pudp, addr); + if (likely(!(flags & NO_FIXMAP))) + pmdp = pmd_set_fixmap_offset(pudp, addr); + else + pmdp = pmd_offset(pudp, addr); do { pmd_t old_pmd = READ_ONCE(*pmdp); @@ -133,7 +137,8 @@ static void init_pmd(pud_t *pudp, unsigned long addr, unsigned long end, phys += next - addr; } while (pmdp++, addr = next, addr != end); - pmd_clear_fixmap(); + if (likely(!(flags & NO_FIXMAP))) + pmd_clear_fixmap(); } static void alloc_init_cont_pmd(pud_t *pudp, unsigned long addr, @@ -207,7 +212,10 @@ static void alloc_init_pud(pgd_t *pgdp, unsigned long addr, unsigned long end, } BUG_ON(p4d_bad(p4d)); - pudp = pud_set_fixmap_offset(p4dp, addr); + if (likely(!(flags & NO_FIXMAP))) + pudp = pud_set_fixmap_offset(p4dp, addr); + else + pudp = pud_offset(p4dp, addr); do { pud_t old_pud = READ_ONCE(*pudp); @@ -236,7 +244,8 @@ static void alloc_init_pud(pgd_t *pgdp, unsigned long addr, unsigned long end, phys += next - addr; } while (pudp++, addr = next, addr != end); - pud_clear_fixmap(); + if (likely(!(flags & NO_FIXMAP))) + pud_clear_fixmap(); } static void __create_pgd_mapping(pgd_t *pgdir, unsigned int entries_cnt, phys_addr_t phys, -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel