| Message ID | 20160907042908.6232-2-takahiro.akashi@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
On Thu, Sep 22, 2016 at 12:23:08PM +0200, Matthias Bruger wrote: > > > On 09/07/2016 06:29 AM, AKASHI Takahiro wrote: > >On the startup of primary kernel, the memory region used by crash dump > >kernel must be specified by "crashkernel=" kernel parameter. > >reserve_crashkernel() will allocate and reserve the region for later use. > > > >User space tools, like kexec-tools, will be able to find that region as > > - "Crash kernel" in /proc/iomem, or > > - "linux,crashkernel-base" and "linux,crashkernel-size" under > > /sys/firmware/devicetree/base/chosen > > > >Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> > >Signed-off-by: Mark Salter <msalter@redhat.com> > >Signed-off-by: Pratyush Anand <panand@redhat.com> > >Reviewed-by: James Morse <james.morse@arm.com> > >--- > > arch/arm64/kernel/setup.c | 7 ++- > > arch/arm64/mm/init.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++ > > 2 files changed, 119 insertions(+), 1 deletion(-) > > > >diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c > >index 514b4e3..38589b5 100644 > >--- a/arch/arm64/kernel/setup.c > >+++ b/arch/arm64/kernel/setup.c > >@@ -31,7 +31,6 @@ > > #include <linux/screen_info.h> > > #include <linux/init.h> > > #include <linux/kexec.h> > >-#include <linux/crash_dump.h> > > #include <linux/root_dev.h> > > #include <linux/cpu.h> > > #include <linux/interrupt.h> > >@@ -225,6 +224,12 @@ static void __init request_standard_resources(void) > > kernel_data.end <= res->end) > > request_resource(res, &kernel_data); > > } > >+ > >+#ifdef CONFIG_KEXEC_CORE > >+ /* User space tools will find "Crash kernel" region in /proc/iomem. */ > >+ if (crashk_res.end) > >+ insert_resource(&iomem_resource, &crashk_res); > >+#endif > > } > > > > u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; > >diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c > >index bbb7ee7..dd273ec 100644 > >--- a/arch/arm64/mm/init.c > >+++ b/arch/arm64/mm/init.c > >@@ -29,11 +29,13 @@ > > #include <linux/gfp.h> > > #include <linux/memblock.h> > > #include <linux/sort.h> > >+#include <linux/of.h> > > #include <linux/of_fdt.h> > > #include <linux/dma-mapping.h> > > #include <linux/dma-contiguous.h> > > #include <linux/efi.h> > > #include <linux/swiotlb.h> > >+#include <linux/kexec.h> > > > > #include <asm/boot.h> > > #include <asm/fixmap.h> > >@@ -76,6 +78,114 @@ static int __init early_initrd(char *p) > > early_param("initrd", early_initrd); > > #endif > > > >+#ifdef CONFIG_KEXEC_CORE > >+static unsigned long long crash_size, crash_base; > >+static struct property crash_base_prop = { > >+ .name = "linux,crashkernel-base", > >+ .length = sizeof(u64), > >+ .value = &crash_base > >+}; > >+static struct property crash_size_prop = { > >+ .name = "linux,crashkernel-size", > >+ .length = sizeof(u64), > >+ .value = &crash_size, > >+}; > >+ > >+static int __init export_crashkernel(void) > >+{ > >+ struct device_node *node; > >+ int ret; > >+ > >+ if (!crashk_res.end) > >+ return 0; > >+ > >+ crash_base = cpu_to_be64(crashk_res.start); > >+ crash_size = cpu_to_be64(crashk_res.end - crashk_res.start + 1); > >+ > > Shouldn't that be the same values as in reserve_crashkernel()? > IMHO this does not need to be recalculated here. Right. crashk_res is calculated from crash_base/size. So I should and will remove those lines. Thanks, -Takahiro AKASHI > Regards, > Matthias > > >+ /* Add /chosen/linux,crashkernel-* properties */ > >+ node = of_find_node_by_path("/chosen"); > >+ if (!node) > >+ return -ENOENT; > >+ > >+ /* > >+ * There might be existing crash kernel properties, but we can't > >+ * be sure what's in them, so remove them. > >+ */ > >+ of_remove_property(node, of_find_property(node, > >+ "linux,crashkernel-base", NULL)); > >+ of_remove_property(node, of_find_property(node, > >+ "linux,crashkernel-size", NULL)); > >+ > >+ ret = of_add_property(node, &crash_base_prop); > >+ if (ret) > >+ goto ret_err; > >+ > >+ ret = of_add_property(node, &crash_size_prop); > >+ if (ret) > >+ goto ret_err; > >+ > >+ return 0; > >+ > >+ret_err: > >+ pr_warn("Exporting crashkernel region to device tree failed\n"); > >+ return ret; > >+} > >+late_initcall(export_crashkernel); > >+ > >+/* > >+ * reserve_crashkernel() - reserves memory for crash kernel > >+ * > >+ * This function reserves memory area given in "crashkernel=" kernel command > >+ * line parameter. The memory reserved is used by dump capture kernel when > >+ * primary kernel is crashing. > >+ */ > >+static void __init reserve_crashkernel(void) > >+{ > >+ int ret; > >+ > >+ ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), > >+ &crash_size, &crash_base); > >+ /* no crashkernel= or invalid value specified */ > >+ if (ret || !crash_size) > >+ return; > >+ > >+ if (crash_base == 0) { > >+ /* Current arm64 boot protocol requires 2MB alignment */ > >+ crash_base = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT, > >+ crash_size, SZ_2M); > >+ if (crash_base == 0) { > >+ pr_warn("Unable to allocate crashkernel (size:%llx)\n", > >+ crash_size); > >+ return; > >+ } > >+ } else { > >+ /* User specifies base address explicitly. */ > >+ if (!memblock_is_region_memory(crash_base, crash_size) || > >+ memblock_is_region_reserved(crash_base, crash_size)) { > >+ pr_warn("crashkernel has wrong address or size\n"); > >+ return; > >+ } > >+ > >+ if (!IS_ALIGNED(crash_base, SZ_2M)) { > >+ pr_warn("crashkernel base address is not 2MB aligned\n"); > >+ return; > >+ } > >+ } > >+ memblock_reserve(crash_base, crash_size); > >+ > >+ pr_info("Reserving %lldMB of memory at %lldMB for crashkernel\n", > >+ crash_size >> 20, crash_base >> 20); > >+ > >+ crashk_res.start = crash_base; > >+ crashk_res.end = crash_base + crash_size - 1; > >+} > >+#else > >+static void __init reserve_crashkernel(void) > >+{ > >+ ; > >+} > >+#endif /* CONFIG_KEXEC_CORE */ > >+ > > /* > > * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It > > * currently assumes that for memory starting above 4G, 32-bit devices will > >@@ -296,6 +406,9 @@ void __init arm64_memblock_init(void) > > arm64_dma_phys_limit = max_zone_dma_phys(); > > else > > arm64_dma_phys_limit = PHYS_MASK + 1; > >+ > >+ reserve_crashkernel(); > >+ > > dma_contiguous_reserve(arm64_dma_phys_limit); > > > > memblock_allow_resize(); > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 514b4e3..38589b5 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -31,7 +31,6 @@ #include <linux/screen_info.h> #include <linux/init.h> #include <linux/kexec.h> -#include <linux/crash_dump.h> #include <linux/root_dev.h> #include <linux/cpu.h> #include <linux/interrupt.h> @@ -225,6 +224,12 @@ static void __init request_standard_resources(void) kernel_data.end <= res->end) request_resource(res, &kernel_data); } + +#ifdef CONFIG_KEXEC_CORE + /* User space tools will find "Crash kernel" region in /proc/iomem. */ + if (crashk_res.end) + insert_resource(&iomem_resource, &crashk_res); +#endif } u64 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID_HWID }; diff --git a/arch/arm64/mm/init.c b/arch/arm64/mm/init.c index bbb7ee7..dd273ec 100644 --- a/arch/arm64/mm/init.c +++ b/arch/arm64/mm/init.c @@ -29,11 +29,13 @@ #include <linux/gfp.h> #include <linux/memblock.h> #include <linux/sort.h> +#include <linux/of.h> #include <linux/of_fdt.h> #include <linux/dma-mapping.h> #include <linux/dma-contiguous.h> #include <linux/efi.h> #include <linux/swiotlb.h> +#include <linux/kexec.h> #include <asm/boot.h> #include <asm/fixmap.h> @@ -76,6 +78,114 @@ static int __init early_initrd(char *p) early_param("initrd", early_initrd); #endif +#ifdef CONFIG_KEXEC_CORE +static unsigned long long crash_size, crash_base; +static struct property crash_base_prop = { + .name = "linux,crashkernel-base", + .length = sizeof(u64), + .value = &crash_base +}; +static struct property crash_size_prop = { + .name = "linux,crashkernel-size", + .length = sizeof(u64), + .value = &crash_size, +}; + +static int __init export_crashkernel(void) +{ + struct device_node *node; + int ret; + + if (!crashk_res.end) + return 0; + + crash_base = cpu_to_be64(crashk_res.start); + crash_size = cpu_to_be64(crashk_res.end - crashk_res.start + 1); + + /* Add /chosen/linux,crashkernel-* properties */ + node = of_find_node_by_path("/chosen"); + if (!node) + return -ENOENT; + + /* + * There might be existing crash kernel properties, but we can't + * be sure what's in them, so remove them. + */ + of_remove_property(node, of_find_property(node, + "linux,crashkernel-base", NULL)); + of_remove_property(node, of_find_property(node, + "linux,crashkernel-size", NULL)); + + ret = of_add_property(node, &crash_base_prop); + if (ret) + goto ret_err; + + ret = of_add_property(node, &crash_size_prop); + if (ret) + goto ret_err; + + return 0; + +ret_err: + pr_warn("Exporting crashkernel region to device tree failed\n"); + return ret; +} +late_initcall(export_crashkernel); + +/* + * reserve_crashkernel() - reserves memory for crash kernel + * + * This function reserves memory area given in "crashkernel=" kernel command + * line parameter. The memory reserved is used by dump capture kernel when + * primary kernel is crashing. + */ +static void __init reserve_crashkernel(void) +{ + int ret; + + ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), + &crash_size, &crash_base); + /* no crashkernel= or invalid value specified */ + if (ret || !crash_size) + return; + + if (crash_base == 0) { + /* Current arm64 boot protocol requires 2MB alignment */ + crash_base = memblock_find_in_range(0, ARCH_LOW_ADDRESS_LIMIT, + crash_size, SZ_2M); + if (crash_base == 0) { + pr_warn("Unable to allocate crashkernel (size:%llx)\n", + crash_size); + return; + } + } else { + /* User specifies base address explicitly. */ + if (!memblock_is_region_memory(crash_base, crash_size) || + memblock_is_region_reserved(crash_base, crash_size)) { + pr_warn("crashkernel has wrong address or size\n"); + return; + } + + if (!IS_ALIGNED(crash_base, SZ_2M)) { + pr_warn("crashkernel base address is not 2MB aligned\n"); + return; + } + } + memblock_reserve(crash_base, crash_size); + + pr_info("Reserving %lldMB of memory at %lldMB for crashkernel\n", + crash_size >> 20, crash_base >> 20); + + crashk_res.start = crash_base; + crashk_res.end = crash_base + crash_size - 1; +} +#else +static void __init reserve_crashkernel(void) +{ + ; +} +#endif /* CONFIG_KEXEC_CORE */ + /* * Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It * currently assumes that for memory starting above 4G, 32-bit devices will @@ -296,6 +406,9 @@ void __init arm64_memblock_init(void) arm64_dma_phys_limit = max_zone_dma_phys(); else arm64_dma_phys_limit = PHYS_MASK + 1; + + reserve_crashkernel(); + dma_contiguous_reserve(arm64_dma_phys_limit); memblock_allow_resize();