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Date: Thu, 1 Dec 2016 16:19:58 -0800 From: Scott Branden <scott.branden@...adcom.com> To: Arnd Bergmann <arnd@...db.de>, Russell King <linux@...linux.org.uk>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Ard Biesheuvel <ard.biesheuvel@...aro.org>, Mark Rutland <mark.rutland@....com>, Xishi Qiu <qiuxishi@...wei.com>, bielski@...tmail.net Cc: BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>, Tang Chen <tangchen@...fujitsu.com>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Scott Branden <scott.branden@...adcom.com> Subject: [RFC PATCH 1/2] arm64: memory-hotplug: Add MEMORY_HOTPLUG, MEMORY_HOTREMOVE, MEMORY_PROBE Add memory-hotplug support for ARM64 platform. This requires addition of ARCH_ENABLE_MEMORY_HOTPLUG and ARCH_ENABLE_MEMORY_HOTREMOVE config options. MEMORY_PROBE config option is added to support /sys/devices/system/memory/probe functionality. In addition architecture specific arch_add_memory and arch_remove memory management functions are added. Signed-off-by: Scott Branden <scott.branden@...adcom.com> --- arch/arm64/Kconfig | 10 ++++++++++ arch/arm64/mm/init.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 969ef88..2482fdd 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -576,6 +576,12 @@ config HOTPLUG_CPU Say Y here to experiment with turning CPUs off and on. CPUs can be controlled through /sys/devices/system/cpu. +config ARCH_ENABLE_MEMORY_HOTPLUG + def_bool y + +config ARCH_ENABLE_MEMORY_HOTREMOVE + def_bool y + # Common NUMA Features config NUMA bool "Numa Memory Allocation and Scheduler Support" @@ -646,6 +652,10 @@ config ARCH_HAS_CACHE_LINE_SIZE source "mm/Kconfig" +config ARCH_MEMORY_PROBE + def_bool y + depends on MEMORY_HOTPLUG + config SECCOMP bool "Enable seccomp to safely compute untrusted bytecode" ---help--- diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index 212c4d1..687d087 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -536,3 +536,45 @@ static int __init register_mem_limit_dumper(void) return 0; } __initcall(register_mem_limit_dumper); + +#ifdef CONFIG_MEMORY_HOTPLUG +int arch_add_memory(int nid, u64 start, u64 size, bool for_device) +{ + pg_data_t *pgdat; + struct zone *zone; + unsigned long start_pfn = start >> PAGE_SHIFT; + unsigned long nr_pages = size >> PAGE_SHIFT; + int ret; + + pgdat = NODE_DATA(nid); + + zone = pgdat->node_zones + + zone_for_memory(nid, start, size, ZONE_NORMAL, for_device); + ret = __add_pages(nid, zone, start_pfn, nr_pages); + + if (ret) + pr_warn("%s: Problem encountered in __add_pages() ret=%d\n", + __func__, ret); + + return ret; +} + +#ifdef CONFIG_MEMORY_HOTREMOVE +int arch_remove_memory(u64 start, u64 size) +{ + unsigned long start_pfn = start >> PAGE_SHIFT; + unsigned long nr_pages = size >> PAGE_SHIFT; + struct zone *zone; + int ret; + + zone = page_zone(pfn_to_page(start_pfn)); + ret = __remove_pages(zone, start_pfn, nr_pages); + if (ret) + pr_warn("%s: Problem encountered in __remove_pages() ret=%d\n", + __func__, ret); + + return ret; +} +#endif +#endif + -- 2.5.0
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