fadump: Remove the phyp assisted dump code.
Remove the phyp assisted dump implementation which is not is use. Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Mahesh Salgaonkar
Benjamin Herrenschmidt
parent
67b43b9d7c
commit
12d9299241
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@ -1,127 +0,0 @@
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Hypervisor-Assisted Dump
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------------------------
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November 2007
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The goal of hypervisor-assisted dump is to enable the dump of
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a crashed system, and to do so from a fully-reset system, and
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to minimize the total elapsed time until the system is back
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in production use.
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As compared to kdump or other strategies, hypervisor-assisted
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dump offers several strong, practical advantages:
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-- Unlike kdump, the system has been reset, and loaded
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with a fresh copy of the kernel. In particular,
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PCI and I/O devices have been reinitialized and are
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in a clean, consistent state.
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-- As the dump is performed, the dumped memory becomes
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immediately available to the system for normal use.
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-- After the dump is completed, no further reboots are
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required; the system will be fully usable, and running
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in its normal, production mode on its normal kernel.
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The above can only be accomplished by coordination with,
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and assistance from the hypervisor. The procedure is
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as follows:
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-- When a system crashes, the hypervisor will save
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the low 256MB of RAM to a previously registered
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save region. It will also save system state, system
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registers, and hardware PTE's.
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-- After the low 256MB area has been saved, the
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hypervisor will reset PCI and other hardware state.
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It will *not* clear RAM. It will then launch the
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bootloader, as normal.
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-- The freshly booted kernel will notice that there
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is a new node (ibm,dump-kernel) in the device tree,
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indicating that there is crash data available from
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a previous boot. It will boot into only 256MB of RAM,
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reserving the rest of system memory.
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-- Userspace tools will parse /sys/kernel/release_region
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and read /proc/vmcore to obtain the contents of memory,
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which holds the previous crashed kernel. The userspace
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tools may copy this info to disk, or network, nas, san,
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iscsi, etc. as desired.
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For Example: the values in /sys/kernel/release-region
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would look something like this (address-range pairs).
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CPU:0x177fee000-0x10000: HPTE:0x177ffe020-0x1000: /
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DUMP:0x177fff020-0x10000000, 0x10000000-0x16F1D370A
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-- As the userspace tools complete saving a portion of
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dump, they echo an offset and size to
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/sys/kernel/release_region to release the reserved
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memory back to general use.
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An example of this is:
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"echo 0x40000000 0x10000000 > /sys/kernel/release_region"
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which will release 256MB at the 1GB boundary.
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Please note that the hypervisor-assisted dump feature
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is only available on Power6-based systems with recent
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firmware versions.
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Implementation details:
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----------------------
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During boot, a check is made to see if firmware supports
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this feature on this particular machine. If it does, then
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we check to see if a active dump is waiting for us. If yes
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then everything but 256 MB of RAM is reserved during early
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boot. This area is released once we collect a dump from user
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land scripts that are run. If there is dump data, then
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the /sys/kernel/release_region file is created, and
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the reserved memory is held.
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If there is no waiting dump data, then only the highest
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256MB of the ram is reserved as a scratch area. This area
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is *not* released: this region will be kept permanently
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reserved, so that it can act as a receptacle for a copy
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of the low 256MB in the case a crash does occur. See,
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however, "open issues" below, as to whether
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such a reserved region is really needed.
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Currently the dump will be copied from /proc/vmcore to a
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a new file upon user intervention. The starting address
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to be read and the range for each data point in provided
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in /sys/kernel/release_region.
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The tools to examine the dump will be same as the ones
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used for kdump.
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General notes:
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--------------
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Security: please note that there are potential security issues
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with any sort of dump mechanism. In particular, plaintext
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(unencrypted) data, and possibly passwords, may be present in
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the dump data. Userspace tools must take adequate precautions to
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preserve security.
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Open issues/ToDo:
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------------
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o The various code paths that tell the hypervisor that a crash
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occurred, vs. it simply being a normal reboot, should be
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reviewed, and possibly clarified/fixed.
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o Instead of using /sys/kernel, should there be a /sys/dump
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instead? There is a dump_subsys being created by the s390 code,
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perhaps the pseries code should use a similar layout as well.
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o Is reserving a 256MB region really required? The goal of
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reserving a 256MB scratch area is to make sure that no
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important crash data is clobbered when the hypervisor
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save low mem to the scratch area. But, if one could assure
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that nothing important is located in some 256MB area, then
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it would not need to be reserved. Something that can be
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improved in subsequent versions.
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o Still working the kdump team to integrate this with kdump,
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some work remains but this would not affect the current
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patches.
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o Still need to write a shell script, to copy the dump away.
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Currently I am parsing it manually.
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@ -376,16 +376,6 @@ config CRASH_DUMP
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The same kernel binary can be used as production kernel and dump
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capture kernel.
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config PHYP_DUMP
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bool "Hypervisor-assisted dump (EXPERIMENTAL)"
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depends on PPC_PSERIES && EXPERIMENTAL
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help
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Hypervisor-assisted dump is meant to be a kdump replacement
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offering robustness and speed not possible without system
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hypervisor assistance.
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If unsure, say "N"
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config FA_DUMP
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bool "Firmware-assisted dump"
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depends on PPC64 && PPC_RTAS && CRASH_DUMP
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@ -1,47 +0,0 @@
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/*
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* Hypervisor-assisted dump
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*
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* Linas Vepstas, Manish Ahuja 2008
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* Copyright 2008 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _PPC64_PHYP_DUMP_H
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#define _PPC64_PHYP_DUMP_H
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#ifdef CONFIG_PHYP_DUMP
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/* The RMR region will be saved for later dumping
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* whenever the kernel crashes. Set this to 256MB. */
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#define PHYP_DUMP_RMR_START 0x0
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#define PHYP_DUMP_RMR_END (1UL<<28)
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struct phyp_dump {
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/* Memory that is reserved during very early boot. */
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unsigned long init_reserve_start;
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unsigned long init_reserve_size;
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/* cmd line options during boot */
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unsigned long reserve_bootvar;
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unsigned long phyp_dump_at_boot;
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/* Check status during boot if dump supported, active & present*/
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unsigned long phyp_dump_configured;
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unsigned long phyp_dump_is_active;
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/* store cpu & hpte size */
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unsigned long cpu_state_size;
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unsigned long hpte_region_size;
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/* previous scratch area values */
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unsigned long reserved_scratch_addr;
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unsigned long reserved_scratch_size;
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};
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extern struct phyp_dump *phyp_dump_info;
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int early_init_dt_scan_phyp_dump(unsigned long node,
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const char *uname, int depth, void *data);
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#endif /* CONFIG_PHYP_DUMP */
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#endif /* _PPC64_PHYP_DUMP_H */
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@ -52,7 +52,6 @@
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#include <asm/machdep.h>
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#include <asm/pSeries_reconfig.h>
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#include <asm/pci-bridge.h>
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#include <asm/phyp_dump.h>
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#include <asm/kexec.h>
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#include <asm/opal.h>
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#include <asm/fadump.h>
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@ -616,86 +615,6 @@ static void __init early_reserve_mem(void)
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}
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}
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#ifdef CONFIG_PHYP_DUMP
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/**
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* phyp_dump_calculate_reserve_size() - reserve variable boot area 5% or arg
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*
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* Function to find the largest size we need to reserve
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* during early boot process.
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*
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* It either looks for boot param and returns that OR
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* returns larger of 256 or 5% rounded down to multiples of 256MB.
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*
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*/
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static inline unsigned long phyp_dump_calculate_reserve_size(void)
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{
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unsigned long tmp;
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if (phyp_dump_info->reserve_bootvar)
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return phyp_dump_info->reserve_bootvar;
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/* divide by 20 to get 5% of value */
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tmp = memblock_end_of_DRAM();
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do_div(tmp, 20);
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/* round it down in multiples of 256 */
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tmp = tmp & ~0x0FFFFFFFUL;
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return (tmp > PHYP_DUMP_RMR_END ? tmp : PHYP_DUMP_RMR_END);
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}
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/**
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* phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
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*
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* This routine may reserve memory regions in the kernel only
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* if the system is supported and a dump was taken in last
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* boot instance or if the hardware is supported and the
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* scratch area needs to be setup. In other instances it returns
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* without reserving anything. The memory in case of dump being
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* active is freed when the dump is collected (by userland tools).
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*/
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static void __init phyp_dump_reserve_mem(void)
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{
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unsigned long base, size;
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unsigned long variable_reserve_size;
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if (!phyp_dump_info->phyp_dump_configured) {
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printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
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return;
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}
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if (!phyp_dump_info->phyp_dump_at_boot) {
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printk(KERN_INFO "Phyp-dump disabled at boot time\n");
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return;
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}
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variable_reserve_size = phyp_dump_calculate_reserve_size();
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if (phyp_dump_info->phyp_dump_is_active) {
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/* Reserve *everything* above RMR.Area freed by userland tools*/
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base = variable_reserve_size;
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size = memblock_end_of_DRAM() - base;
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/* XXX crashed_ram_end is wrong, since it may be beyond
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* the memory_limit, it will need to be adjusted. */
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memblock_reserve(base, size);
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phyp_dump_info->init_reserve_start = base;
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phyp_dump_info->init_reserve_size = size;
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} else {
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size = phyp_dump_info->cpu_state_size +
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phyp_dump_info->hpte_region_size +
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variable_reserve_size;
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base = memblock_end_of_DRAM() - size;
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memblock_reserve(base, size);
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phyp_dump_info->init_reserve_start = base;
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phyp_dump_info->init_reserve_size = size;
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}
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}
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#else
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static inline void __init phyp_dump_reserve_mem(void) {}
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#endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
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void __init early_init_devtree(void *params)
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{
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phys_addr_t limit;
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@ -715,11 +634,6 @@ void __init early_init_devtree(void *params)
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of_scan_flat_dt(early_init_dt_scan_opal, NULL);
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#endif
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#ifdef CONFIG_PHYP_DUMP
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/* scan tree to see if dump occurred during last boot */
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of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
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#endif
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#ifdef CONFIG_FA_DUMP
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/* scan tree to see if dump is active during last boot */
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of_scan_flat_dt(early_init_dt_scan_fw_dump, NULL);
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@ -765,7 +679,6 @@ void __init early_init_devtree(void *params)
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#endif
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reserve_crashkernel();
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early_reserve_mem();
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phyp_dump_reserve_mem();
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/*
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* Ensure that total memory size is page-aligned, because otherwise
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@ -18,7 +18,6 @@ obj-$(CONFIG_MEMORY_HOTPLUG) += hotplug-memory.o
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obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o
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obj-$(CONFIG_HVCS) += hvcserver.o
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obj-$(CONFIG_HCALL_STATS) += hvCall_inst.o
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obj-$(CONFIG_PHYP_DUMP) += phyp_dump.o
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obj-$(CONFIG_CMM) += cmm.o
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obj-$(CONFIG_DTL) += dtl.o
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obj-$(CONFIG_IO_EVENT_IRQ) += io_event_irq.o
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@ -1,513 +0,0 @@
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/*
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* Hypervisor-assisted dump
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*
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* Linas Vepstas, Manish Ahuja 2008
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* Copyright 2008 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/gfp.h>
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#include <linux/init.h>
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#include <linux/kobject.h>
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#include <linux/mm.h>
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#include <linux/of.h>
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#include <linux/pfn.h>
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#include <linux/swap.h>
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#include <linux/sysfs.h>
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#include <asm/page.h>
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#include <asm/phyp_dump.h>
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#include <asm/machdep.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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/* Variables, used to communicate data between early boot and late boot */
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static struct phyp_dump phyp_dump_vars;
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struct phyp_dump *phyp_dump_info = &phyp_dump_vars;
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static int ibm_configure_kernel_dump;
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/* ------------------------------------------------- */
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/* RTAS interfaces to declare the dump regions */
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struct dump_section {
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u32 dump_flags;
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u16 source_type;
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u16 error_flags;
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u64 source_address;
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u64 source_length;
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u64 length_copied;
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u64 destination_address;
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};
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struct phyp_dump_header {
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u32 version;
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u16 num_of_sections;
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u16 status;
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u32 first_offset_section;
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u32 dump_disk_section;
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u64 block_num_dd;
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u64 num_of_blocks_dd;
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u32 offset_dd;
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u32 maxtime_to_auto;
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/* No dump disk path string used */
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struct dump_section cpu_data;
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struct dump_section hpte_data;
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struct dump_section kernel_data;
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};
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/* The dump header *must be* in low memory, so .bss it */
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static struct phyp_dump_header phdr;
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#define NUM_DUMP_SECTIONS 3
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#define DUMP_HEADER_VERSION 0x1
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#define DUMP_REQUEST_FLAG 0x1
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#define DUMP_SOURCE_CPU 0x0001
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#define DUMP_SOURCE_HPTE 0x0002
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#define DUMP_SOURCE_RMO 0x0011
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#define DUMP_ERROR_FLAG 0x2000
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#define DUMP_TRIGGERED 0x4000
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#define DUMP_PERFORMED 0x8000
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/**
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* init_dump_header() - initialize the header declaring a dump
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* Returns: length of dump save area.
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*
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* When the hypervisor saves crashed state, it needs to put
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* it somewhere. The dump header tells the hypervisor where
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* the data can be saved.
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*/
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static unsigned long init_dump_header(struct phyp_dump_header *ph)
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{
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unsigned long addr_offset = 0;
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/* Set up the dump header */
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ph->version = DUMP_HEADER_VERSION;
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ph->num_of_sections = NUM_DUMP_SECTIONS;
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ph->status = 0;
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ph->first_offset_section =
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(u32)offsetof(struct phyp_dump_header, cpu_data);
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ph->dump_disk_section = 0;
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ph->block_num_dd = 0;
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ph->num_of_blocks_dd = 0;
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ph->offset_dd = 0;
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ph->maxtime_to_auto = 0; /* disabled */
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/* The first two sections are mandatory */
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ph->cpu_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->cpu_data.source_type = DUMP_SOURCE_CPU;
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ph->cpu_data.source_address = 0;
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ph->cpu_data.source_length = phyp_dump_info->cpu_state_size;
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ph->cpu_data.destination_address = addr_offset;
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addr_offset += phyp_dump_info->cpu_state_size;
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ph->hpte_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->hpte_data.source_type = DUMP_SOURCE_HPTE;
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ph->hpte_data.source_address = 0;
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ph->hpte_data.source_length = phyp_dump_info->hpte_region_size;
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ph->hpte_data.destination_address = addr_offset;
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addr_offset += phyp_dump_info->hpte_region_size;
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/* This section describes the low kernel region */
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ph->kernel_data.dump_flags = DUMP_REQUEST_FLAG;
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ph->kernel_data.source_type = DUMP_SOURCE_RMO;
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ph->kernel_data.source_address = PHYP_DUMP_RMR_START;
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ph->kernel_data.source_length = PHYP_DUMP_RMR_END;
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ph->kernel_data.destination_address = addr_offset;
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addr_offset += ph->kernel_data.source_length;
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return addr_offset;
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}
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static void print_dump_header(const struct phyp_dump_header *ph)
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{
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#ifdef DEBUG
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if (ph == NULL)
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return;
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printk(KERN_INFO "dump header:\n");
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/* 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);
|
||||
Reference in New Issue