From: Kefeng Wang <wangkefeng.wang@huawei.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, Andrey Konovalov <andreyknvl@gmail.com>, Dmitry Vyukov <dvyukov@google.com> Cc: <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <kasan-dev@googlegroups.com>, <linux-mm@kvack.org>, Kefeng Wang <wangkefeng.wang@huawei.com> Subject: [PATCH v2 2/3] arm64: Support page mapping percpu first chunk allocator Date: Tue, 20 Jul 2021 10:51:04 +0800 [thread overview] Message-ID: <20210720025105.103680-3-wangkefeng.wang@huawei.com> (raw) In-Reply-To: <20210720025105.103680-1-wangkefeng.wang@huawei.com> Percpu embedded first chunk allocator is the firstly option, but it could fails on ARM64, eg, "percpu: max_distance=0x5fcfdc640000 too large for vmalloc space 0x781fefff0000" "percpu: max_distance=0x600000540000 too large for vmalloc space 0x7dffb7ff0000" "percpu: max_distance=0x5fff9adb0000 too large for vmalloc space 0x5dffb7ff0000" then we could meet "WARNING: CPU: 15 PID: 461 at vmalloc.c:3087 pcpu_get_vm_areas+0x488/0x838", even the system could not boot successfully. Let's implement page mapping percpu first chunk allocator as a fallback to the embedding allocator to increase the robustness of the system. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- arch/arm64/Kconfig | 4 ++ drivers/base/arch_numa.c | 82 +++++++++++++++++++++++++++++++++++----- 2 files changed, 76 insertions(+), 10 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b5b13a932561..eacb5873ded1 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1045,6 +1045,10 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK def_bool y depends on NUMA +config NEED_PER_CPU_PAGE_FIRST_CHUNK + def_bool y + depends on NUMA + source "kernel/Kconfig.hz" config ARCH_SPARSEMEM_ENABLE diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c index 4cc4e117727d..563b2013b75a 100644 --- a/drivers/base/arch_numa.c +++ b/drivers/base/arch_numa.c @@ -14,6 +14,7 @@ #include <linux/of.h> #include <asm/sections.h> +#include <asm/pgalloc.h> struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; EXPORT_SYMBOL(node_data); @@ -168,22 +169,83 @@ static void __init pcpu_fc_free(void *ptr, size_t size) memblock_free_early(__pa(ptr), size); } +#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK +static void __init pcpu_populate_pte(unsigned long addr) +{ + pgd_t *pgd = pgd_offset_k(addr); + p4d_t *p4d; + pud_t *pud; + pmd_t *pmd; + + p4d = p4d_offset(pgd, addr); + if (p4d_none(*p4d)) { + pud_t *new; + + new = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!new) + goto err_alloc; + p4d_populate(&init_mm, p4d, new); + } + + pud = pud_offset(p4d, addr); + if (pud_none(*pud)) { + pmd_t *new; + + new = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!new) + goto err_alloc; + pud_populate(&init_mm, pud, new); + } + + pmd = pmd_offset(pud, addr); + if (!pmd_present(*pmd)) { + pte_t *new; + + new = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!new) + goto err_alloc; + pmd_populate_kernel(&init_mm, pmd, new); + } + + return; + +err_alloc: + panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n", + __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE); +} +#endif + void __init setup_per_cpu_areas(void) { unsigned long delta; unsigned int cpu; - int rc; + int rc = -EINVAL; + + if (pcpu_chosen_fc != PCPU_FC_PAGE) { + /* + * Always reserve area for module percpu variables. That's + * what the legacy allocator did. + */ + rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, + PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, + pcpu_cpu_distance, + pcpu_fc_alloc, pcpu_fc_free); +#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK + if (rc < 0) + pr_warn("PERCPU: %s allocator failed (%d), falling back to page size\n", + pcpu_fc_names[pcpu_chosen_fc], rc); +#endif + } - /* - * Always reserve area for module percpu variables. That's - * what the legacy allocator did. - */ - rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, - PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, - pcpu_cpu_distance, - pcpu_fc_alloc, pcpu_fc_free); +#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK + if (rc < 0) + rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, + pcpu_fc_alloc, + pcpu_fc_free, + pcpu_populate_pte); +#endif if (rc < 0) - panic("Failed to initialize percpu areas."); + panic("Failed to initialize percpu areas (err=%d).", rc); delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; for_each_possible_cpu(cpu) -- 2.26.2
WARNING: multiple messages have this Message-ID (diff)
From: Kefeng Wang <wangkefeng.wang@huawei.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Andrey Ryabinin <ryabinin.a.a@gmail.com>, Andrey Konovalov <andreyknvl@gmail.com>, Dmitry Vyukov <dvyukov@google.com> Cc: <linux-arm-kernel@lists.infradead.org>, <linux-kernel@vger.kernel.org>, <kasan-dev@googlegroups.com>, <linux-mm@kvack.org>, Kefeng Wang <wangkefeng.wang@huawei.com> Subject: [PATCH v2 2/3] arm64: Support page mapping percpu first chunk allocator Date: Tue, 20 Jul 2021 10:51:04 +0800 [thread overview] Message-ID: <20210720025105.103680-3-wangkefeng.wang@huawei.com> (raw) In-Reply-To: <20210720025105.103680-1-wangkefeng.wang@huawei.com> Percpu embedded first chunk allocator is the firstly option, but it could fails on ARM64, eg, "percpu: max_distance=0x5fcfdc640000 too large for vmalloc space 0x781fefff0000" "percpu: max_distance=0x600000540000 too large for vmalloc space 0x7dffb7ff0000" "percpu: max_distance=0x5fff9adb0000 too large for vmalloc space 0x5dffb7ff0000" then we could meet "WARNING: CPU: 15 PID: 461 at vmalloc.c:3087 pcpu_get_vm_areas+0x488/0x838", even the system could not boot successfully. Let's implement page mapping percpu first chunk allocator as a fallback to the embedding allocator to increase the robustness of the system. Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> --- arch/arm64/Kconfig | 4 ++ drivers/base/arch_numa.c | 82 +++++++++++++++++++++++++++++++++++----- 2 files changed, 76 insertions(+), 10 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b5b13a932561..eacb5873ded1 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -1045,6 +1045,10 @@ config NEED_PER_CPU_EMBED_FIRST_CHUNK def_bool y depends on NUMA +config NEED_PER_CPU_PAGE_FIRST_CHUNK + def_bool y + depends on NUMA + source "kernel/Kconfig.hz" config ARCH_SPARSEMEM_ENABLE diff --git a/drivers/base/arch_numa.c b/drivers/base/arch_numa.c index 4cc4e117727d..563b2013b75a 100644 --- a/drivers/base/arch_numa.c +++ b/drivers/base/arch_numa.c @@ -14,6 +14,7 @@ #include <linux/of.h> #include <asm/sections.h> +#include <asm/pgalloc.h> struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; EXPORT_SYMBOL(node_data); @@ -168,22 +169,83 @@ static void __init pcpu_fc_free(void *ptr, size_t size) memblock_free_early(__pa(ptr), size); } +#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK +static void __init pcpu_populate_pte(unsigned long addr) +{ + pgd_t *pgd = pgd_offset_k(addr); + p4d_t *p4d; + pud_t *pud; + pmd_t *pmd; + + p4d = p4d_offset(pgd, addr); + if (p4d_none(*p4d)) { + pud_t *new; + + new = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!new) + goto err_alloc; + p4d_populate(&init_mm, p4d, new); + } + + pud = pud_offset(p4d, addr); + if (pud_none(*pud)) { + pmd_t *new; + + new = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!new) + goto err_alloc; + pud_populate(&init_mm, pud, new); + } + + pmd = pmd_offset(pud, addr); + if (!pmd_present(*pmd)) { + pte_t *new; + + new = memblock_alloc(PAGE_SIZE, PAGE_SIZE); + if (!new) + goto err_alloc; + pmd_populate_kernel(&init_mm, pmd, new); + } + + return; + +err_alloc: + panic("%s: Failed to allocate %lu bytes align=%lx from=%lx\n", + __func__, PAGE_SIZE, PAGE_SIZE, PAGE_SIZE); +} +#endif + void __init setup_per_cpu_areas(void) { unsigned long delta; unsigned int cpu; - int rc; + int rc = -EINVAL; + + if (pcpu_chosen_fc != PCPU_FC_PAGE) { + /* + * Always reserve area for module percpu variables. That's + * what the legacy allocator did. + */ + rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, + PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, + pcpu_cpu_distance, + pcpu_fc_alloc, pcpu_fc_free); +#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK + if (rc < 0) + pr_warn("PERCPU: %s allocator failed (%d), falling back to page size\n", + pcpu_fc_names[pcpu_chosen_fc], rc); +#endif + } - /* - * Always reserve area for module percpu variables. That's - * what the legacy allocator did. - */ - rc = pcpu_embed_first_chunk(PERCPU_MODULE_RESERVE, - PERCPU_DYNAMIC_RESERVE, PAGE_SIZE, - pcpu_cpu_distance, - pcpu_fc_alloc, pcpu_fc_free); +#ifdef CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK + if (rc < 0) + rc = pcpu_page_first_chunk(PERCPU_MODULE_RESERVE, + pcpu_fc_alloc, + pcpu_fc_free, + pcpu_populate_pte); +#endif if (rc < 0) - panic("Failed to initialize percpu areas."); + panic("Failed to initialize percpu areas (err=%d).", rc); delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; for_each_possible_cpu(cpu) -- 2.26.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-07-20 2:53 UTC|newest] Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-20 2:51 [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang 2021-07-20 2:51 ` Kefeng Wang 2021-07-20 2:51 ` [PATCH v2 1/3] vmalloc: Choose a better start address in vm_area_register_early() Kefeng Wang 2021-07-20 2:51 ` Kefeng Wang 2021-08-01 15:23 ` Catalin Marinas 2021-08-01 15:23 ` Catalin Marinas 2021-08-02 2:39 ` Kefeng Wang 2021-08-02 2:39 ` Kefeng Wang 2021-08-04 11:14 ` Catalin Marinas 2021-08-04 11:14 ` Catalin Marinas 2021-08-05 12:46 ` Kefeng Wang 2021-08-05 12:46 ` Kefeng Wang 2021-07-20 2:51 ` Kefeng Wang [this message] 2021-07-20 2:51 ` [PATCH v2 2/3] arm64: Support page mapping percpu first chunk allocator Kefeng Wang 2021-08-01 15:53 ` Catalin Marinas 2021-08-01 15:53 ` Catalin Marinas 2021-08-02 2:47 ` Kefeng Wang 2021-08-02 2:47 ` Kefeng Wang 2021-07-20 2:51 ` [PATCH v2 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC Kefeng Wang 2021-07-20 2:51 ` Kefeng Wang 2021-07-22 11:00 ` Marco Elver 2021-07-22 11:00 ` Marco Elver 2021-07-22 12:14 ` Kefeng Wang 2021-07-22 12:14 ` Kefeng Wang 2021-07-26 1:19 ` [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang 2021-07-26 1:19 ` Kefeng Wang
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