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Fri, 7 Aug 2020 06:23:22 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8553B221E5; Fri, 7 Aug 2020 06:23:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596781401; bh=uvQwcFTIf4q/HJ34D7U3/XoAfS+lyL5UaaUr9QsjiuY=; h=Date:From:To:Subject:In-Reply-To:From; b=r5YUKC5IGVXB1tXaAtwWKMDjtjO449VXBKPKG6ogaiDT9tfxXrfyKk4YlO42/o8Gh uKaX3wsO9wA7ZURI3zKkk55ecwFrhpl/0eAG6J8CN+XYgs2zA9d3BJXaD64sEt/HF8 RWxlSNQ277VQd8RA9VqIj6SFOcdKCk66LSMXkCl4= Date: Thu, 06 Aug 2020 23:23:19 -0700 From: Andrew Morton To: akpm@linux-foundation.org, anshuman.khandual@arm.com, benh@kernel.crashing.org, bp@alien8.de, catalin.marinas@arm.com, corbet@lwn.net, dan.j.williams@intel.com, dave.hansen@linux.intel.com, david@redhat.com, fenghua.yu@intel.com, hpa@zytor.com, hsinyi@chromium.org, justin.he@arm.com, kirill.shutemov@linux.intel.com, linux-mm@kvack.org, luto@kernel.org, mark.rutland@arm.com, mhocko@suse.com, mingo@redhat.com, mm-commits@vger.kernel.org, mpe@ellerman.id.au, palmer@dabbelt.com, pasha.tatashin@soleen.com, paul.walmsley@sifive.com, paulus@samba.org, peterz@infradead.org, robin.murphy@arm.com, rppt@linux.ibm.com, steve.capper@arm.com, tglx@linutronix.de, tony.luck@intel.com, torvalds@linux-foundation.org, will@kernel.org, willy@infradead.org, yuzhao@google.com Subject: [patch 109/163] mm/sparsemem: enable vmem_altmap support in vmemmap_populate_basepages() Message-ID: <20200807062319.DkSvcHBWW%akpm@linux-foundation.org> In-Reply-To: <20200806231643.a2711a608dd0f18bff2caf2b@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Rspamd-Queue-Id: 3C79E180868E6 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Anshuman Khandual Subject: mm/sparsemem: enable vmem_altmap support in vmemmap_populate_basepages() Patch series "arm64: Enable vmemmap mapping from device memory", v4. This series enables vmemmap backing memory allocation from device memory ranges on arm64. But before that, it enables vmemmap_populate_basepages() and vmemmap_alloc_block_buf() to accommodate struct vmem_altmap based alocation requests. This patch (of 3): vmemmap_populate_basepages() is used across platforms to allocate backing memory for vmemmap mapping. This is used as a standard default choice or as a fallback when intended huge pages allocation fails. This just creates entire vmemmap mapping with base pages (PAGE_SIZE). On arm64 platforms, vmemmap_populate_basepages() is called instead of the platform specific vmemmap_populate() when ARM64_SWAPPER_USES_SECTION_MAPS is not enabled as in case for ARM64_16K_PAGES and ARM64_64K_PAGES configs. At present vmemmap_populate_basepages() does not support allocating from driver defined struct vmem_altmap while trying to create vmemmap mapping for a device memory range. It prevents ARM64_16K_PAGES and ARM64_64K_PAGES configs on arm64 from supporting device memory with vmemap_altmap request. This enables vmem_altmap support in vmemmap_populate_basepages() unlocking device memory allocation for vmemap mapping on arm64 platforms with 16K or 64K base page configs. Each architecture should evaluate and decide on subscribing device memory based base page allocation through vmemmap_populate_basepages(). Hence lets keep it disabled on all archs in order to preserve the existing semantics. A subsequent patch enables it on arm64. Link: http://lkml.kernel.org/r/1594004178-8861-1-git-send-email-anshuman.khandual@arm.com Link: http://lkml.kernel.org/r/1594004178-8861-2-git-send-email-anshuman.khandual@arm.com Signed-off-by: Anshuman Khandual Acked-by: Will Deacon Acked-by: Catalin Marinas Reviewed-by: David Hildenbrand Tested-by: Jia He Cc: Mark Rutland Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Tony Luck Cc: Fenghua Yu Cc: Dave Hansen Cc: Andy Lutomirski Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Mike Rapoport Cc: Michal Hocko Cc: "Matthew Wilcox (Oracle)" Cc: "Kirill A. Shutemov" Cc: Dan Williams Cc: Pavel Tatashin Cc: Benjamin Herrenschmidt Cc: Borislav Petkov Cc: "H. Peter Anvin" Cc: Hsin-Yi Wang Cc: Jonathan Corbet Cc: Michael Ellerman Cc: Paul Mackerras Cc: Robin Murphy Cc: Steve Capper Cc: Yu Zhao Signed-off-by: Andrew Morton --- arch/arm64/mm/mmu.c | 2 +- arch/ia64/mm/discontig.c | 2 +- arch/riscv/mm/init.c | 2 +- arch/x86/mm/init_64.c | 6 +++--- include/linux/mm.h | 5 +++-- mm/sparse-vmemmap.c | 16 +++++++++++----- 6 files changed, 20 insertions(+), 13 deletions(-) --- a/arch/arm64/mm/mmu.c~mm-sparsemem-enable-vmem_altmap-support-in-vmemmap_populate_basepages +++ a/arch/arm64/mm/mmu.c @@ -1070,7 +1070,7 @@ static void free_empty_tables(unsigned l int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, struct vmem_altmap *altmap) { - return vmemmap_populate_basepages(start, end, node); + return vmemmap_populate_basepages(start, end, node, NULL); } #else /* !ARM64_SWAPPER_USES_SECTION_MAPS */ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, --- a/arch/ia64/mm/discontig.c~mm-sparsemem-enable-vmem_altmap-support-in-vmemmap_populate_basepages +++ a/arch/ia64/mm/discontig.c @@ -655,7 +655,7 @@ void arch_refresh_nodedata(int update_no int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, struct vmem_altmap *altmap) { - return vmemmap_populate_basepages(start, end, node); + return vmemmap_populate_basepages(start, end, node, NULL); } void vmemmap_free(unsigned long start, unsigned long end, --- a/arch/riscv/mm/init.c~mm-sparsemem-enable-vmem_altmap-support-in-vmemmap_populate_basepages +++ a/arch/riscv/mm/init.c @@ -554,6 +554,6 @@ void __init paging_init(void) int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, struct vmem_altmap *altmap) { - return vmemmap_populate_basepages(start, end, node); + return vmemmap_populate_basepages(start, end, node, NULL); } #endif --- a/arch/x86/mm/init_64.c~mm-sparsemem-enable-vmem_altmap-support-in-vmemmap_populate_basepages +++ a/arch/x86/mm/init_64.c @@ -1545,7 +1545,7 @@ static int __meminit vmemmap_populate_hu vmemmap_verify((pte_t *)pmd, node, addr, next); continue; } - if (vmemmap_populate_basepages(addr, next, node)) + if (vmemmap_populate_basepages(addr, next, node, NULL)) return -ENOMEM; } return 0; @@ -1557,7 +1557,7 @@ int __meminit vmemmap_populate(unsigned int err; if (end - start < PAGES_PER_SECTION * sizeof(struct page)) - err = vmemmap_populate_basepages(start, end, node); + err = vmemmap_populate_basepages(start, end, node, NULL); else if (boot_cpu_has(X86_FEATURE_PSE)) err = vmemmap_populate_hugepages(start, end, node, altmap); else if (altmap) { @@ -1565,7 +1565,7 @@ int __meminit vmemmap_populate(unsigned __func__); err = -ENOMEM; } else - err = vmemmap_populate_basepages(start, end, node); + err = vmemmap_populate_basepages(start, end, node, NULL); if (!err) sync_global_pgds(start, end - 1); return err; --- a/include/linux/mm.h~mm-sparsemem-enable-vmem_altmap-support-in-vmemmap_populate_basepages +++ a/include/linux/mm.h @@ -2978,14 +2978,15 @@ pgd_t *vmemmap_pgd_populate(unsigned lon p4d_t *vmemmap_p4d_populate(pgd_t *pgd, unsigned long addr, int node); pud_t *vmemmap_pud_populate(p4d_t *p4d, unsigned long addr, int node); pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node); -pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node); +pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node, + struct vmem_altmap *altmap); void *vmemmap_alloc_block(unsigned long size, int node); struct vmem_altmap; void *vmemmap_alloc_block_buf(unsigned long size, int node); void *altmap_alloc_block_buf(unsigned long size, struct vmem_altmap *altmap); void vmemmap_verify(pte_t *, int, unsigned long, unsigned long); int vmemmap_populate_basepages(unsigned long start, unsigned long end, - int node); + int node, struct vmem_altmap *altmap); int vmemmap_populate(unsigned long start, unsigned long end, int node, struct vmem_altmap *altmap); void vmemmap_populate_print_last(void); --- a/mm/sparse-vmemmap.c~mm-sparsemem-enable-vmem_altmap-support-in-vmemmap_populate_basepages +++ a/mm/sparse-vmemmap.c @@ -139,12 +139,18 @@ void __meminit vmemmap_verify(pte_t *pte start, end - 1); } -pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node) +pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node, + struct vmem_altmap *altmap) { pte_t *pte = pte_offset_kernel(pmd, addr); if (pte_none(*pte)) { pte_t entry; - void *p = vmemmap_alloc_block_buf(PAGE_SIZE, node); + void *p; + + if (altmap) + p = altmap_alloc_block_buf(PAGE_SIZE, altmap); + else + p = vmemmap_alloc_block_buf(PAGE_SIZE, node); if (!p) return NULL; entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL); @@ -212,8 +218,8 @@ pgd_t * __meminit vmemmap_pgd_populate(u return pgd; } -int __meminit vmemmap_populate_basepages(unsigned long start, - unsigned long end, int node) +int __meminit vmemmap_populate_basepages(unsigned long start, unsigned long end, + int node, struct vmem_altmap *altmap) { unsigned long addr = start; pgd_t *pgd; @@ -235,7 +241,7 @@ int __meminit vmemmap_populate_basepages pmd = vmemmap_pmd_populate(pud, addr, node); if (!pmd) return -ENOMEM; - pte = vmemmap_pte_populate(pmd, addr, node); + pte = vmemmap_pte_populate(pmd, addr, node, altmap); if (!pte) return -ENOMEM; vmemmap_verify(pte, node, addr, addr + PAGE_SIZE);