diff options
| -rw-r--r-- | Documentation/powerpc/phyp-assisted-dump.txt | 127 | ||||
| -rw-r--r-- | arch/powerpc/Kconfig | 10 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/phyp_dump.h | 47 | ||||
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 87 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/Makefile | 1 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/phyp_dump.c | 513 |
6 files changed, 0 insertions, 785 deletions
diff --git a/Documentation/powerpc/phyp-assisted-dump.txt b/Documentation/powerpc/phyp-assisted-dump.txt deleted file mode 100644 index ad340205d96a..000000000000 --- a/Documentation/powerpc/phyp-assisted-dump.txt +++ /dev/null @@ -1,127 +0,0 @@ - - Hypervisor-Assisted Dump - ------------------------ - November 2007 - -The goal of hypervisor-assisted dump is to enable the dump of -a crashed system, and to do so from a fully-reset system, and -to minimize the total elapsed time until the system is back -in production use. - -As compared to kdump or other strategies, hypervisor-assisted -dump offers several strong, practical advantages: - --- Unlike kdump, the system has been reset, and loaded - with a fresh copy of the kernel. In particular, - PCI and I/O devices have been reinitialized and are - in a clean, consistent state. --- As the dump is performed, the dumped memory becomes - immediately available to the system for normal use. --- After the dump is completed, no further reboots are - required; the system will be fully usable, and running - in its normal, production mode on its normal kernel. - -The above can only be accomplished by coordination with, -and assistance from the hypervisor. The procedure is -as follows: - --- When a system crashes, the hypervisor will save - the low 256MB of RAM to a previously registered - save region. It will also save system state, system - registers, and hardware PTE's. - --- After the low 256MB area has been saved, the - hypervisor will reset PCI and other hardware state. - It will *not* clear RAM. It will then launch the - bootloader, as normal. - --- The freshly booted kernel will notice that there - is a new node (ibm,dump-kernel) in the device tree, - indicating that there is crash data available from - a previous boot. It will boot into only 256MB of RAM, - reserving the rest of system memory. - --- Userspace tools will parse /sys/kernel/release_region - and read /proc/vmcore to obtain the contents of memory, - which holds the previous crashed kernel. The userspace - tools may copy this info to disk, or network, nas, san, - iscsi, etc. as desired. - - For Example: the values in /sys/kernel/release-region - would look something like this (address-range pairs). - CPU:0x177fee000-0x10000: HPTE:0x177ffe020-0x1000: / - DUMP:0x177fff020-0x10000000, 0x10000000-0x16F1D370A - --- As the userspace tools complete saving a portion of - dump, they echo an offset and size to - /sys/kernel/release_region to release the reserved - memory back to general use. - - An example of this is: - "echo 0x40000000 0x10000000 > /sys/kernel/release_region" - which will release 256MB at the 1GB boundary. - -Please note that the hypervisor-assisted dump feature -is only available on Power6-based systems with recent -firmware versions. - -Implementation details: ----------------------- - -During boot, a check is made to see if firmware supports -this feature on this particular machine. If it does, then -we check to see if a active dump is waiting for us. If yes -then everything but 256 MB of RAM is reserved during early -boot. This area is released once we collect a dump from user -land scripts that are run. If there is dump data, then -the /sys/kernel/release_region file is created, and -the reserved memory is held. - -If there is no waiting dump data, then only the highest -256MB of the ram is reserved as a scratch area. This area -is *not* released: this region will be kept permanently -reserved, so that it can act as a receptacle for a copy -of the low 256MB in the case a crash does occur. See, -however, "open issues" below, as to whether -such a reserved region is really needed. - -Currently the dump will be copied from /proc/vmcore to a -a new file upon user intervention. The starting address -to be read and the range for each data point in provided -in /sys/kernel/release_region. - -The tools to examine the dump will be same as the ones -used for kdump. - -General notes: --------------- -Security: please note that there are potential security issues -with any sort of dump mechanism. In particular, plaintext -(unencrypted) data, and possibly passwords, may be present in -the dump data. Userspace tools must take adequate precautions to -preserve security. - -Open issues/ToDo: ------------- - o The various code paths that tell the hypervisor that a crash - occurred, vs. it simply being a normal reboot, should be - reviewed, and possibly clarified/fixed. - - o Instead of using /sys/kernel, should there be a /sys/dump - instead? There is a dump_subsys being created by the s390 code, - perhaps the pseries code should use a similar layout as well. - - o Is reserving a 256MB region really required? The goal of - reserving a 256MB scratch area is to make sure that no - important crash data is clobbered when the hypervisor - save low mem to the scratch area. But, if one could assure - that nothing important is located in some 256MB area, then - it would not need to be reserved. Something that can be - improved in subsequent versions. - - o Still working the kdump team to integrate this with kdump, - some work remains but this would not affect the current - patches. - - o Still need to write a shell script, to copy the dump away. - Currently I am parsing it manually. diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index afa4dabfad7c..c71311133e66 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -376,16 +376,6 @@ config CRASH_DUMP The same kernel binary can be used as production kernel and dump capture kernel. -config PHYP_DUMP - bool "Hypervisor-assisted dump (EXPERIMENTAL)" - depends on PPC_PSERIES && EXPERIMENTAL - help - Hypervisor-assisted dump is meant to be a kdump replacement - offering robustness and speed not possible without system - hypervisor assistance. - - If unsure, say "N" - config FA_DUMP bool "Firmware-assisted dump" depends on PPC64 && PPC_RTAS && CRASH_DUMP diff --git a/arch/powerpc/include/asm/phyp_dump.h b/arch/powerpc/include/asm/phyp_dump.h deleted file mode 100644 index fa74c6c3e106..000000000000 --- a/arch/powerpc/include/asm/phyp_dump.h +++ /dev/null @@ -1,47 +0,0 @@ -/* - * 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. - */ - -#ifndef _PPC64_PHYP_DUMP_H -#define _PPC64_PHYP_DUMP_H - -#ifdef CONFIG_PHYP_DUMP - -/* The RMR region will be saved for later dumping - * whenever the kernel crashes. Set this to 256MB. */ -#define PHYP_DUMP_RMR_START 0x0 -#define PHYP_DUMP_RMR_END (1UL<<28) - -struct phyp_dump { - /* Memory that is reserved during very early boot. */ - unsigned long init_reserve_start; - unsigned long init_reserve_size; - /* cmd line options during boot */ - unsigned long reserve_bootvar; - unsigned long phyp_dump_at_boot; - /* Check status during boot if dump supported, active & present*/ - unsigned long phyp_dump_configured; - unsigned long phyp_dump_is_active; - /* store cpu & hpte size */ - unsigned long cpu_state_size; - unsigned long hpte_region_size; - /* previous scratch area values */ - unsigned long reserved_scratch_addr; - unsigned long reserved_scratch_size; -}; - -extern struct phyp_dump *phyp_dump_info; - -int early_init_dt_scan_phyp_dump(unsigned long node, - const char *uname, int depth, void *data); - -#endif /* CONFIG_PHYP_DUMP */ -#endif /* _PPC64_PHYP_DUMP_H */ diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c index 70222b35cfc5..89e850af3dd6 100644 --- a/arch/powerpc/kernel/prom.c +++ b/arch/powerpc/kernel/prom.c @@ -52,7 +52,6 @@ #include <asm/machdep.h> #include <asm/pSeries_reconfig.h> #include <asm/pci-bridge.h> -#include <asm/phyp_dump.h> #include <asm/kexec.h> #include <asm/opal.h> #include <asm/fadump.h> @@ -616,86 +615,6 @@ static void __init early_reserve_mem(void) } } -#ifdef CONFIG_PHYP_DUMP -/** - * phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg - * - * Function to find the largest size we need to reserve - * during early boot process. - * - * It either looks for boot param and returns that OR - * returns larger of 256 or 5% rounded down to multiples of 256MB. - * - */ -static inline unsigned long phyp_dump_calculate_reserve_size(void) -{ - unsigned long tmp; - - if (phyp_dump_info->reserve_bootvar) - return phyp_dump_info->reserve_bootvar; - - /* divide by 20 to get 5% of value */ - tmp = memblock_end_of_DRAM(); - do_div(tmp, 20); - - /* round it down in multiples of 256 */ - tmp = tmp & ~0x0FFFFFFFUL; - - return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END); -} - -/** - * 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; - unsigned long variable_reserve_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_at_boot) { - printk(KERN_INFO "Phyp-dump disabled at boot time\n"); - return; - } - - variable_reserve_size = phyp_dump_calculate_reserve_size(); - - if (phyp_dump_info->phyp_dump_is_active) { - /* Reserve *everything* above RMR.Area freed by userland tools*/ - base = variable_reserve_size; - size = memblock_end_of_DRAM() - base; - - /* XXX crashed_ram_end is wrong, since it may be beyond - * the memory_limit, it will need to be adjusted. */ - memblock_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 + - variable_reserve_size; - base = memblock_end_of_DRAM() - size; - memblock_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) { phys_addr_t limit; @@ -715,11 +634,6 @@ void __init early_init_devtree(void *params) of_scan_flat_dt(early_init_dt_scan_opal, NULL); #endif -#ifdef CONFIG_PHYP_DUMP - /* scan tree to see if dump occurred during last boot */ - of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL); -#endif - #ifdef CONFIG_FA_DUMP /* scan tree to see if dump is active during last boot */ of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL); @@ -765,7 +679,6 @@ void __init early_init_devtree(void *params) #endif reserve_crashkernel(); early_reserve_mem(); - phyp_dump_reserve_mem(); /* * Ensure that total memory size is page-aligned, because otherwise diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile index 236db46b4078..67b3e6e0cf3f 100644 --- a/arch/powerpc/platforms/pseries/Makefile +++ b/arch/powerpc/platforms/pseries/Makefile @@ -18,7 +18,6 @@ obj-$(CONFIG_MEMORY_HOTPLUG) += hotplug-memory.o obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o obj-$(CONFIG_HVCS) += hvcserver.o obj-$(CONFIG_HCALL_STATS) += hvCall_inst.o -obj-$(CONFIG_PHYP_DUMP) += phyp_dump.o obj-$(CONFIG_CMM) += cmm.o obj-$(CONFIG_DTL) += dtl.o obj-$(CONFIG_IO_EVENT_IRQ) += io_event_irq.o diff --git a/arch/powerpc/platforms/pseries/phyp_dump.c b/arch/powerpc/platforms/pseries/phyp_dump.c deleted file mode 100644 index 6e7742da0072..000000000000 --- a/arch/powerpc/platforms/pseries/phyp_dump.c +++ /dev/null @@ -1,513 +0,0 @@ -/* - * 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/gfp.h> -#include <linux/init.h> -#include <linux/kobject.h> -#include <linux/mm.h> -#include <linux/of.h> -#include <linux/pfn.h> -#include <linux/swap.h> -#include <linux/sysfs.h> - -#include <asm/page.h> -#include <asm/phyp_dump.h> -#include <asm/machdep.h> -#include <asm/prom.h> -#include <asm/rtas.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; - -static int ibm_configure_kernel_dump; -/* ------------------------------------------------- */ -/* RTAS interfaces to declare the dump regions */ - -struct dump_section { - u32 dump_flags; - u16 source_type; - u16 error_flags; - u64 source_address; - u64 source_length; - u64 length_copied; - u64 destination_address; -}; - -struct phyp_dump_header { - u32 version; - u16 num_of_sections; - u16 status; - - u32 first_offset_section; - u32 dump_disk_section; - u64 block_num_dd; - u64 num_of_blocks_dd; - u32 offset_dd; - u32 maxtime_to_auto; - /* No dump disk path string used */ - - struct dump_section cpu_data; - struct dump_section hpte_data; - struct dump_section kernel_data; -}; - -/* The dump header *must be* in low memory, so .bss it */ -static struct phyp_dump_header phdr; - -#define NUM_DUMP_SECTIONS 3 -#define DUMP_HEADER_VERSION 0x1 -#define DUMP_REQUEST_FLAG 0x1 -#define DUMP_SOURCE_CPU 0x0001 -#define DUMP_SOURCE_HPTE 0x0002 -#define DUMP_SOURCE_RMO 0x0011 -#define DUMP_ERROR_FLAG 0x2000 -#define DUMP_TRIGGERED 0x4000 -#define DUMP_PERFORMED 0x8000 - - -/** - * init_dump_header() - initialize the header declaring a dump - * Returns: length of dump save area. - * - * When the hypervisor saves crashed state, it needs to put - * it somewhere. The dump header tells the hypervisor where - * the data can be saved. - */ -static unsigned long init_dump_header(struct phyp_dump_header *ph) -{ - unsigned long addr_offset = 0; - - /* Set up the dump header */ - ph->version = DUMP_HEADER_VERSION; - ph->num_of_sections = NUM_DUMP_SECTIONS; - ph->status = 0; - - ph->first_offset_section = - (u32)offsetof(struct phyp_dump_header, cpu_data); - ph->dump_disk_section = 0; - ph->block_num_dd = 0; - ph->num_of_blocks_dd = 0; - ph->offset_dd = 0; - - ph->maxtime_to_auto = 0; /* disabled */ - - /* The first two sections are mandatory */ - ph->cpu_data.dump_flags = DUMP_REQUEST_FLAG; - ph->cpu_data.source_type = DUMP_SOURCE_CPU; - ph->cpu_data.source_address = 0; - ph->cpu_data.source_length = phyp_dump_info->cpu_state_size; - ph->cpu_data.destination_address = addr_offset; - addr_offset += phyp_dump_info->cpu_state_size; - - ph->hpte_data.dump_flags = DUMP_REQUEST_FLAG; - ph->hpte_data.source_type = DUMP_SOURCE_HPTE; - ph->hpte_data.source_address = 0; - ph->hpte_data.source_length = phyp_dump_info->hpte_region_size; - ph->hpte_data.destination_address = addr_offset; - addr_offset += phyp_dump_info->hpte_region_size; - - /* This section describes the low kernel region */ - ph->kernel_data.dump_flags = DUMP_REQUEST_FLAG; - ph->kernel_data.source_type = DUMP_SOURCE_RMO; - ph->kernel_data.source_address = PHYP_DUMP_RMR_START; - ph->kernel_data.source_length = PHYP_DUMP_RMR_END; - ph->kernel_data.destination_address = addr_offset; - addr_offset += ph->kernel_data.source_length; - - return addr_offset; -} - -static void print_dump_header(const struct phyp_dump_header *ph) -{ -#ifdef DEBUG - if (ph == NULL) - return; - - printk(KERN_INFO "dump header:\n"); - /* setup some ph->sections required */ - printk(KERN_INFO "version = %d\n", ph->version); - printk(KERN_INFO "Sections = %d\n", ph->num_of_sections); - printk(KERN_INFO "Status = 0x%x\n", ph->status); - - /* No ph->disk, so all should be set to 0 */ - printk(KERN_INFO "Offset to first section 0x%x\n", - ph->first_offset_section); - printk(KERN_INFO "dump disk sections should be zero\n"); - printk(KERN_INFO "dump disk section = %d\n", ph->dump_disk_section); - printk(KERN_INFO "block num = %lld\n", ph->block_num_dd); - printk(KERN_INFO "number of blocks = %lld\n", ph->num_of_blocks_dd); - printk(KERN_INFO "dump disk offset = %d\n", ph->offset_dd); - printk(KERN_INFO "Max auto time= %d\n", ph->maxtime_to_auto); - - /*set cpu state and hpte states as well scratch pad area */ - printk(KERN_INFO " CPU AREA\n"); - printk(KERN_INFO "cpu dump_flags =%d\n", ph->cpu_data.dump_flags); - printk(KERN_INFO "cpu source_type =%d\n", ph->cpu_data.source_type); - printk(KERN_INFO "cpu error_flags =%d\n", ph->cpu_data.error_flags); - printk(KERN_INFO "cpu source_address =%llx\n", - ph->cpu_data.source_address); - printk(KERN_INFO "cpu source_length =%llx\n", - ph->cpu_data.source_length); - printk(KERN_INFO "cpu length_copied =%llx\n", - ph->cpu_data.length_copied); - - printk(KERN_INFO " HPTE AREA\n"); - printk(KERN_INFO "HPTE dump_flags =%d\n", ph->hpte_data.dump_flags); - printk(KERN_INFO "HPTE source_type =%d\n", ph->hpte_data.source_type); - printk(KERN_INFO "HPTE error_flags =%d\n", ph->hpte_data.error_flags); - printk(KERN_INFO "HPTE source_address =%llx\n", - ph->hpte_data.source_address); - printk(KERN_INFO "HPTE source_length =%llx\n", - ph->hpte_data.source_length); - printk(KERN_INFO "HPTE length_copied =%llx\n", - ph->hpte_data.length_copied); - - printk(KERN_INFO " SRSD AREA\n"); - printk(KERN_INFO "SRSD dump_flags =%d\n", ph->kernel_data.dump_flags); - printk(KERN_INFO "SRSD source_type =%d\n", ph->kernel_data.source_type); - printk(KERN_INFO "SRSD error_flags =%d\n", ph->kernel_data.error_flags); - printk(KERN_INFO "SRSD source_address =%llx\n", - ph->kernel_data.source_address); - printk(KERN_INFO "SRSD source_length =%llx\n", - ph->kernel_data.source_length); - printk(KERN_INFO "SRSD length_copied =%llx\n", - ph->kernel_data.length_copied); -#endif -} - -static ssize_t show_phyp_dump_active(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) -{ - - /* create filesystem entry so kdump is phyp-dump aware */ - return sprintf(buf, "%lx\n", phyp_dump_info->phyp_dump_at_boot); -} - -static struct kobj_attribute pdl = __ATTR(phyp_dump_active, 0600, - show_phyp_dump_active, - NULL); - -static void register_dump_area(struct phyp_dump_header *ph, unsigned long addr) -{ - int rc; - - /* Add addr value if not initialized before */ - if (ph->cpu_data.destination_address == 0) { - ph->cpu_data.destination_address += addr; - ph->hpte_data.destination_address += addr; - ph->kernel_data.destination_address += addr; - } - - /* ToDo Invalidate kdump and free memory range. */ - - do { - rc = rtas_call(ibm_configure_kernel_dump, 3, 1, NULL, - 1, ph, sizeof(struct phyp_dump_header)); - } while (rtas_busy_delay(rc)); - - if (rc) { - printk(KERN_ERR "phyp-dump: unexpected error (%d) on " - "register\n", rc); - print_dump_header(ph); - return; - } - - rc = sysfs_create_file(kernel_kobj, &pdl.attr); - if (rc) - printk(KERN_ERR "phyp-dump: unable to create sysfs" - " file (%d)\n", rc); -} - -static -void invalidate_last_dump(struct phyp_dump_header *ph, unsigned long addr) -{ - int rc; - - /* Add addr value if not initialized before */ - if (ph->cpu_data.destination_address == 0) { - ph->cpu_data.destination_address += addr; - ph->hpte_data.destination_address += addr; - ph->kernel_data.destination_address += addr; - } - - do { - rc = rtas_call(ibm_configure_kernel_dump, 3, 1, NULL, - 2, ph, sizeof(struct phyp_dump_header)); - } while (rtas_busy_delay(rc)); - - if (rc) { - printk(KERN_ERR "phyp-dump: unexpected error (%d) " - "on invalidate\n", rc); - print_dump_header(ph); - } -} - -/* ------------------------------------------------- */ -/** - * release_memory_range -- release memory previously memblock_reserved - * @start_pfn: starting physical frame number - * @nr_pages: number of pages to free. - * - * This routine will release memory that had been previously - * memblock_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++; - } - } -} - -/** - * track_freed_range -- Counts the range being freed. - * Once the counter goes to zero, it re-registers dump for - * future use. - */ -static void -track_freed_range(unsigned long addr, unsigned long length) -{ - static unsigned long scratch_area_size, reserved_area_size; - - if (addr < phyp_dump_info->init_reserve_start) - return; - - if ((addr >= phyp_dump_info->init_reserve_start) && - (addr <= phyp_dump_info->init_reserve_start + - phyp_dump_info->init_reserve_size)) - reserved_area_size += length; - - if ((addr >= phyp_dump_info->reserved_scratch_addr) && - (addr <= phyp_dump_info->reserved_scratch_addr + - phyp_dump_info->reserved_scratch_size)) - scratch_area_size += length; - - if ((reserved_area_size == phyp_dump_info->init_reserve_size) && - (scratch_area_size == phyp_dump_info->reserved_scratch_size)) { - - invalidate_last_dump(&phdr, - phyp_dump_info->reserved_scratch_addr); - register_dump_area(&phdr, - phyp_dump_info->reserved_scratch_addr); - } -} - -/* ------------------------------------------------- */ -/** - * sysfs_release_region -- sysfs interface to release memory range. - * - * Usage: - * "echo <start addr> <length> > /sys/kernel/release_region" - * - * Example: - * "echo 0x40000000 0x10000000 > /sys/kernel/release_region" - * - * will release 256MB starting at 1GB. - */ -static ssize_t store_release_region(struct kobject *kobj, - struct kobj_attribute *attr, - const char *buf, size_t count) -{ - unsigned long start_addr, length, end_addr; - unsigned long start_pfn, nr_pages; - ssize_t ret; - - ret = sscanf(buf, "%lx %lx", &start_addr, &length); - if (ret != 2) - return -EINVAL; - - track_freed_range(start_addr, length); - - /* Range-check - don't free any reserved memory that - * wasn't reserved for phyp-dump */ - if (start_addr < phyp_dump_info->init_reserve_start) - start_addr = phyp_dump_info->init_reserve_start; - - end_addr = phyp_dump_info->init_reserve_start + - phyp_dump_info->init_reserve_size; - if (start_addr+length > end_addr) - length = end_addr - start_addr; - - /* Release the region of memory assed in by user */ - start_pfn = PFN_DOWN(start_addr); - nr_pages = PFN_DOWN(length); - release_memory_range(start_pfn, nr_pages); - - return count; -} - -static ssize_t show_release_region(struct kobject *kobj, - struct kobj_attribute *attr, char *buf) -{ - u64 second_addr_range; - - /* total reserved size - start of scratch area */ - second_addr_range = phyp_dump_info->init_reserve_size - - phyp_dump_info->reserved_scratch_size; - return sprintf(buf, "CPU:0x%llx-0x%llx: HPTE:0x%llx-0x%llx:" - " DUMP:0x%llx-0x%llx, 0x%lx-0x%llx:\n", - phdr.cpu_data.destination_address, - phdr.cpu_data.length_copied, - phdr.hpte_data.destination_address, - phdr.hpte_data.length_copied, - phdr.kernel_data.destination_address, - phdr.kernel_data.length_copied, - phyp_dump_info->init_reserve_start, - second_addr_range); -} - -static struct kobj_attribute rr = __ATTR(release_region, 0600, - show_release_region, - store_release_region); - -static int __init phyp_dump_setup(void) -{ - struct device_node *rtas; - const struct phyp_dump_header *dump_header = NULL; - unsigned long dump_area_start; - unsigned long dump_area_length; - int header_len = 0; - int rc; - - /* If no memory was reserved in early boot, there is nothing to do */ - if (phyp_dump_info->init_reserve_size == 0) - return 0; - - /* Return if phyp dump not supported */ - if (!phyp_dump_info->phyp_dump_configured) - return -ENOSYS; - - /* Is there dump data waiting for us? If there isn't, - * then register a new dump area, and release all of - * the rest of the reserved ram. - * - * The /rtas/ibm,kernel-dump rtas node is present only - * if there is dump data waiting for us. - */ - rtas = of_find_node_by_path("/rtas"); - if (rtas) { - dump_header = of_get_property(rtas, "ibm,kernel-dump", - &header_len); - of_node_put(rtas); - } - - ibm_configure_kernel_dump = rtas_token("ibm,configure-kernel-dump"); - - print_dump_header(dump_header); - dump_area_length = init_dump_header(&phdr); - /* align down */ - dump_area_start = phyp_dump_info->init_reserve_start & PAGE_MASK; - - if (dump_header == NULL) { - register_dump_area(&phdr, dump_area_start); - return 0; - } - - /* re-register the dump area, if old dump was invalid */ - if ((dump_header) && (dump_header->status & DUMP_ERROR_FLAG)) { - invalidate_last_dump(&phdr, dump_area_start); - register_dump_area(&phdr, dump_area_start); - return 0; - } - - if (dump_header) { - phyp_dump_info->reserved_scratch_addr = - dump_header->cpu_data.destination_address; - phyp_dump_info->reserved_scratch_size = - dump_header->cpu_data.source_length + - dump_header->hpte_data.source_length + - dump_header->kernel_data.source_length; - } - - /* Should we create a dump_subsys, analogous to s390/ipl.c ? */ - rc = sysfs_create_file(kernel_kobj, &rr.attr); - if (rc) - printk(KERN_ERR "phyp-dump: unable to create sysfs file (%d)\n", - rc); - - /* ToDo: re-register the dump area, for next time. */ - 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; -} - -/* Look for phyp_dump= cmdline option */ -static int __init early_phyp_dump_enabled(char *p) -{ - phyp_dump_info->phyp_dump_at_boot = 1; - - if (!p) - return 0; - - if (strncmp(p, "1", 1) == 0) - phyp_dump_info->phyp_dump_at_boot = 1; - else if (strncmp(p, "0", 1) == 0) - phyp_dump_info->phyp_dump_at_boot = 0; - - return 0; -} -early_param("phyp_dump", early_phyp_dump_enabled); - -/* Look for phyp_dump_reserve_size= cmdline option */ -static int __init early_phyp_dump_reserve_size(char *p) -{ - if (p) - phyp_dump_info->reserve_bootvar = memparse(p, &p); - - return 0; -} -early_param("phyp_dump_reserve_size", early_phyp_dump_reserve_size); |