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author | Manish Ahuja <ahuja@austin.ibm.com> | 2008-03-22 10:37:08 +1100 |
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committer | Paul Mackerras <paulus@samba.org> | 2008-03-26 08:44:06 +1100 |
commit | 6ac26c8a7eb149dbd669cc6cd9b77ffc9cd0d2fb (patch) | |
tree | 4eb613ed5f8eb7accb042e30c89d9d25097d557f /arch/powerpc | |
parent | d28a79326a4028dbb1755b8efe6daa915d8bfeea (diff) | |
download | blackbird-op-linux-6ac26c8a7eb149dbd669cc6cd9b77ffc9cd0d2fb.tar.gz blackbird-op-linux-6ac26c8a7eb149dbd669cc6cd9b77ffc9cd0d2fb.zip |
[POWERPC] pseries: phyp dump: Reserve and release memory
Initial patch for reserving memory in early boot, and freeing it
later. If the previous boot had ended with a crash, the reserved
memory would contain a copy of the crashed kernel data.
Signed-off-by: Manish Ahuja <mahuja@us.ibm.com>
Signed-off-by: Linas Vepstas <linasvepstas@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r-- | arch/powerpc/kernel/prom.c | 52 | ||||
-rw-r--r-- | arch/powerpc/platforms/pseries/Makefile | 1 | ||||
-rw-r--r-- | arch/powerpc/platforms/pseries/phyp_dump.c | 103 |
3 files changed, 156 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index ff600ef0b4d6..e6c022ef12ee 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -51,6 +51,7 @@ #include <asm/machdep.h> #include <asm/pSeries_reconfig.h> #include <asm/pci-bridge.h> +#include <asm/phyp_dump.h> #include <asm/kexec.h> #ifdef DEBUG @@ -1040,6 +1041,51 @@ static void __init early_reserve_mem(void) #endif } +#ifdef CONFIG_PHYP_DUMP +/** + * phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory + * + * This routine may reserve memory regions in the kernel only + * if the system is supported and a dump was taken in last + * boot instance or if the hardware is supported and the + * scratch area needs to be setup. In other instances it returns + * without reserving anything. The memory in case of dump being + * active is freed when the dump is collected (by userland tools). + */ +static void __init phyp_dump_reserve_mem(void) +{ + unsigned long base, size; + if (!phyp_dump_info->phyp_dump_configured) { + printk(KERN_ERR "Phyp-dump not supported on this hardware\n"); + return; + } + + if (phyp_dump_info->phyp_dump_is_active) { + /* Reserve *everything* above RMR.Area freed by userland tools*/ + base = PHYP_DUMP_RMR_END; + size = lmb_end_of_DRAM() - base; + + /* XXX crashed_ram_end is wrong, since it may be beyond + * the memory_limit, it will need to be adjusted. */ + lmb_reserve(base, size); + + phyp_dump_info->init_reserve_start = base; + phyp_dump_info->init_reserve_size = size; + } else { + size = phyp_dump_info->cpu_state_size + + phyp_dump_info->hpte_region_size + + PHYP_DUMP_RMR_END; + base = lmb_end_of_DRAM() - size; + lmb_reserve(base, size); + phyp_dump_info->init_reserve_start = base; + phyp_dump_info->init_reserve_size = size; + } +} +#else +static inline void __init phyp_dump_reserve_mem(void) {} +#endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */ + + void __init early_init_devtree(void *params) { DBG(" -> early_init_devtree(%p)\n", params); @@ -1052,6 +1098,11 @@ void __init early_init_devtree(void *params) of_scan_flat_dt(early_init_dt_scan_rtas, NULL); #endif +#ifdef CONFIG_PHYP_DUMP + /* scan tree to see if dump occured during last boot */ + of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL); +#endif + /* Retrieve various informations from the /chosen node of the * device-tree, including the platform type, initrd location and * size, TCE reserve, and more ... @@ -1072,6 +1123,7 @@ void __init early_init_devtree(void *params) reserve_kdump_trampoline(); reserve_crashkernel(); early_reserve_mem(); + phyp_dump_reserve_mem(); lmb_enforce_memory_limit(memory_limit); lmb_analyze(); diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index 992ba6753cf2..bdae04bb7a01 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -18,3 +18,4 @@ obj-$(CONFIG_HOTPLUG_CPU) += hotplug-cpu.o obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o obj-$(CONFIG_HVCS) += hvcserver.o obj-$(CONFIG_HCALL_STATS) += hvCall_inst.o +obj-$(CONFIG_PHYP_DUMP) += phyp_dump.o diff --git a/arch/powerpc/platforms/pseries/phyp_dump.c b/arch/powerpc/platforms/pseries/phyp_dump.c new file mode 100644 index 000000000000..230286cafffe --- /dev/null +++ b/arch/powerpc/platforms/pseries/phyp_dump.c @@ -0,0 +1,103 @@ +/* + * Hypervisor-assisted dump + * + * Linas Vepstas, Manish Ahuja 2008 + * Copyright 2008 IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + */ + +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/pfn.h> +#include <linux/swap.h> + +#include <asm/page.h> +#include <asm/phyp_dump.h> +#include <asm/machdep.h> +#include <asm/prom.h> + +/* Variables, used to communicate data between early boot and late boot */ +static struct phyp_dump phyp_dump_vars; +struct phyp_dump *phyp_dump_info = &phyp_dump_vars; + +/** + * release_memory_range -- release memory previously lmb_reserved + * @start_pfn: starting physical frame number + * @nr_pages: number of pages to free. + * + * This routine will release memory that had been previously + * lmb_reserved in early boot. The released memory becomes + * available for genreal use. + */ +static void +release_memory_range(unsigned long start_pfn, unsigned long nr_pages) +{ + struct page *rpage; + unsigned long end_pfn; + long i; + + end_pfn = start_pfn + nr_pages; + + for (i = start_pfn; i <= end_pfn; i++) { + rpage = pfn_to_page(i); + if (PageReserved(rpage)) { + ClearPageReserved(rpage); + init_page_count(rpage); + __free_page(rpage); + totalram_pages++; + } + } +} + +static int __init phyp_dump_setup(void) +{ + unsigned long start_pfn, nr_pages; + + /* If no memory was reserved in early boot, there is nothing to do */ + if (phyp_dump_info->init_reserve_size == 0) + return 0; + + /* Release memory that was reserved in early boot */ + start_pfn = PFN_DOWN(phyp_dump_info->init_reserve_start); + nr_pages = PFN_DOWN(phyp_dump_info->init_reserve_size); + release_memory_range(start_pfn, nr_pages); + + return 0; +} +machine_subsys_initcall(pseries, phyp_dump_setup); + +int __init early_init_dt_scan_phyp_dump(unsigned long node, + const char *uname, int depth, void *data) +{ + const unsigned int *sizes; + + phyp_dump_info->phyp_dump_configured = 0; + phyp_dump_info->phyp_dump_is_active = 0; + + if (depth != 1 || strcmp(uname, "rtas") != 0) + return 0; + + if (of_get_flat_dt_prop(node, "ibm,configure-kernel-dump", NULL)) + phyp_dump_info->phyp_dump_configured++; + + if (of_get_flat_dt_prop(node, "ibm,dump-kernel", NULL)) + phyp_dump_info->phyp_dump_is_active++; + + sizes = of_get_flat_dt_prop(node, "ibm,configure-kernel-dump-sizes", + NULL); + if (!sizes) + return 0; + + if (sizes[0] == 1) + phyp_dump_info->cpu_state_size = *((unsigned long *)&sizes[1]); + + if (sizes[3] == 2) + phyp_dump_info->hpte_region_size = + *((unsigned long *)&sizes[4]); + return 1; +} |