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提交 12d92992 编写于 作者: M Mahesh Salgaonkar 提交者： Benjamin Herrenschmidt
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fadump: Remove the phyp assisted dump code. 

Remove the phyp assisted dump implementation which is not is use.
Signed-off-by: NMahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
上级 67b43b9d
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Documentation/powerpc/phyp-assisted-dump.txt 已删除 100644 → 0
浏览文件 @ 67b43b9d
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.
arch/powerpc/Kconfig
浏览文件 @ 12d92992
......@@ -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
......
arch/powerpc/include/asm/phyp_dump.h 已删除 100644 → 0
浏览文件 @ 67b43b9d
/*
* 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 */
arch/powerpc/kernel/prom.c
浏览文件 @ 12d92992
......@@ -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
......
arch/powerpc/platforms/pseries/Makefile
浏览文件 @ 12d92992
......@@ -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
......
arch/powerpc/platforms/pseries/phyp_dump.c 已删除 100644 → 0
浏览文件 @ 67b43b9d
/*
* 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);
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