From: takahiro.akashi@linaro.org (AKASHI Takahiro) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v35 03/14] arm64: limit memory regions based on DT property, usable-memory-range Date: Mon, 3 Apr 2017 11:24:31 +0900 [thread overview] Message-ID: <20170403022440.12515-1-takahiro.akashi@linaro.org> (raw) In-Reply-To: <20170403022139.12383-1-takahiro.akashi@linaro.org> Crash dump kernel uses only a limited range of available memory as System RAM. On arm64 kdump, This memory range is advertised to crash dump kernel via a device-tree property under /chosen, linux,usable-memory-range = <BASE SIZE> Crash dump kernel reads this property at boot time and calls memblock_cap_memory_range() to limit usable memory which are listed either in UEFI memory map table or "memory" nodes of a device tree blob. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Geoff Levand <geoff@infradead.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- arch/arm64/mm/init.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index e19e06593e37..290794b1a0f1 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -188,10 +188,45 @@ static int __init early_mem(char *p) } early_param("mem", early_mem); +static int __init early_init_dt_scan_usablemem(unsigned long node, + const char *uname, int depth, void *data) +{ + struct memblock_region *usablemem = data; + const __be32 *reg; + int len; + + if (depth != 1 || strcmp(uname, "chosen") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len); + if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells))) + return 1; + + usablemem->base = dt_mem_next_cell(dt_root_addr_cells, ®); + usablemem->size = dt_mem_next_cell(dt_root_size_cells, ®); + + return 1; +} + +static void __init fdt_enforce_memory_region(void) +{ + struct memblock_region reg = { + .size = 0, + }; + + of_scan_flat_dt(early_init_dt_scan_usablemem, ®); + + if (reg.size) + memblock_cap_memory_range(reg.base, reg.size); +} + void __init arm64_memblock_init(void) { const s64 linear_region_size = -(s64)PAGE_OFFSET; + /* Handle linux,usable-memory-range property */ + fdt_enforce_memory_region(); + /* * Ensure that the linear region takes up exactly half of the kernel * virtual address space. This way, we can distinguish a linear address -- 2.11.1
WARNING: multiple messages have this Message-ID (diff)
From: AKASHI Takahiro <takahiro.akashi@linaro.org> To: catalin.marinas@arm.com, will.deacon@arm.com Cc: mark.rutland@arm.com, panand@redhat.com, ard.biesheuvel@linaro.org, geoff@infradead.org, dwmw2@infradead.org, kexec@lists.infradead.org, AKASHI Takahiro <takahiro.akashi@linaro.org>, james.morse@arm.com, bauerman@linux.vnet.ibm.com, sgoel@codeaurora.org, dyoung@redhat.com, linux-arm-kernel@lists.infradead.org Subject: [PATCH v35 03/14] arm64: limit memory regions based on DT property, usable-memory-range Date: Mon, 3 Apr 2017 11:24:31 +0900 [thread overview] Message-ID: <20170403022440.12515-1-takahiro.akashi@linaro.org> (raw) In-Reply-To: <20170403022139.12383-1-takahiro.akashi@linaro.org> Crash dump kernel uses only a limited range of available memory as System RAM. On arm64 kdump, This memory range is advertised to crash dump kernel via a device-tree property under /chosen, linux,usable-memory-range = <BASE SIZE> Crash dump kernel reads this property at boot time and calls memblock_cap_memory_range() to limit usable memory which are listed either in UEFI memory map table or "memory" nodes of a device tree blob. Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Reviewed-by: Geoff Levand <geoff@infradead.org> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- arch/arm64/mm/init.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index e19e06593e37..290794b1a0f1 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -188,10 +188,45 @@ static int __init early_mem(char *p) } early_param("mem", early_mem); +static int __init early_init_dt_scan_usablemem(unsigned long node, + const char *uname, int depth, void *data) +{ + struct memblock_region *usablemem = data; + const __be32 *reg; + int len; + + if (depth != 1 || strcmp(uname, "chosen") != 0) + return 0; + + reg = of_get_flat_dt_prop(node, "linux,usable-memory-range", &len); + if (!reg || (len < (dt_root_addr_cells + dt_root_size_cells))) + return 1; + + usablemem->base = dt_mem_next_cell(dt_root_addr_cells, ®); + usablemem->size = dt_mem_next_cell(dt_root_size_cells, ®); + + return 1; +} + +static void __init fdt_enforce_memory_region(void) +{ + struct memblock_region reg = { + .size = 0, + }; + + of_scan_flat_dt(early_init_dt_scan_usablemem, ®); + + if (reg.size) + memblock_cap_memory_range(reg.base, reg.size); +} + void __init arm64_memblock_init(void) { const s64 linear_region_size = -(s64)PAGE_OFFSET; + /* Handle linux,usable-memory-range property */ + fdt_enforce_memory_region(); + /* * Ensure that the linear region takes up exactly half of the kernel * virtual address space. This way, we can distinguish a linear address -- 2.11.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2017-04-03 2:24 UTC|newest] Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-03 2:21 [PATCH v35 00/14] arm64: add kdump support AKASHI Takahiro 2017-04-03 2:21 ` AKASHI Takahiro 2017-04-03 2:23 ` [PATCH v35 01/14] memblock: add memblock_clear_nomap() AKASHI Takahiro 2017-04-03 2:23 ` AKASHI Takahiro 2017-04-03 2:23 ` AKASHI Takahiro 2017-04-03 2:23 ` [PATCH v35 02/14] memblock: add memblock_cap_memory_range() AKASHI Takahiro 2017-04-03 2:23 ` AKASHI Takahiro 2017-04-03 2:23 ` AKASHI Takahiro 2017-04-05 17:20 ` Catalin Marinas 2017-04-05 17:20 ` Catalin Marinas 2017-04-05 17:20 ` Catalin Marinas 2017-04-03 2:24 ` AKASHI Takahiro [this message] 2017-04-03 2:24 ` [PATCH v35 03/14] arm64: limit memory regions based on DT property, usable-memory-range AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 04/14] arm64: kdump: reserve memory for crash dump kernel AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 05/14] arm64: mm: add set_memory_valid() AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 06/14] arm64: kdump: protect crash dump kernel memory AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 07/14] arm64: hibernate: preserve kdump image around hibernation AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 08/14] arm64: kdump: implement machine_crash_shutdown() AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro 2017-04-03 9:21 ` David Woodhouse 2017-04-03 9:21 ` David Woodhouse 2017-04-04 7:29 ` AKASHI Takahiro 2017-04-04 7:29 ` AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 09/14] arm64: kdump: add VMCOREINFO's for user-space tools AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 10/14] arm64: kdump: provide /proc/vmcore file AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 11/14] arm64: kdump: enable kdump in defconfig AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro 2017-04-03 2:24 ` [PATCH v35 12/14] Documentation: kdump: describe arm64 port AKASHI Takahiro 2017-04-03 2:24 ` AKASHI Takahiro [not found] ` <20170403022139.12383-1-takahiro.akashi-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> 2017-04-03 2:26 ` [PATCH v35 13/14] Documentation: dt: chosen properties for arm64 kdump AKASHI Takahiro 2017-04-03 2:26 ` AKASHI Takahiro 2017-04-03 2:26 ` AKASHI Takahiro 2017-04-03 2:26 ` [PATCH v35 14/14] efi/libstub/arm*: Set default address and size cells values for an empty dtb AKASHI Takahiro 2017-04-03 2:26 ` AKASHI Takahiro 2017-04-03 2:26 ` AKASHI Takahiro 2017-05-22 0:25 ` [PATCH v35 00/14] arm64: add kdump support AKASHI Takahiro
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