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[POWERPC] pseries: phyp dump: Reserve and release memory

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Initial patch for reserving memory in early boot, and freeing it
later.  If the previous boot had ended with a crash, the reserved
memory would contain a copy of the crashed kernel data.

Signed-off-by: Manish Ahuja <mahuja@us.ibm.com>
Signed-off-by: Linas Vepstas <linasvepstas@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Manish Ahuja
2008-03-22 10:37:08 +11:00
committed by Paul Mackerras
parent d28a79326a
commit 6ac26c8a7e
4 changed files with 197 additions and 0 deletions
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arch/powerpc/kernel/prom.c
+52
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@@ -51,6 +51,7 @@
#include <asm/machdep.h>
#include <asm/pSeries_reconfig.h>
#include <asm/pci-bridge.h>
#include <asm/phyp_dump.h>
#include <asm/kexec.h>
#ifdef DEBUG
@@ -1040,6 +1041,51 @@ static void __init early_reserve_mem(void)
#endif
}
#ifdef CONFIG_PHYP_DUMP
/**
* phyp_dump_reserve_mem() - reserve all not-yet-dumped mmemory
*
* This routine may reserve memory regions in the kernel only
* if the system is supported and a dump was taken in last
* boot instance or if the hardware is supported and the
* scratch area needs to be setup. In other instances it returns
* without reserving anything. The memory in case of dump being
* active is freed when the dump is collected (by userland tools).
*/
static void __init phyp_dump_reserve_mem(void)
{
unsigned long base, size;
if (!phyp_dump_info->phyp_dump_configured) {
printk(KERN_ERR "Phyp-dump not supported on this hardware\n");
return;
}
if (phyp_dump_info->phyp_dump_is_active) {
/* Reserve *everything* above RMR.Area freed by userland tools*/
base = PHYP_DUMP_RMR_END;
size = lmb_end_of_DRAM() - base;
/* XXX crashed_ram_end is wrong, since it may be beyond
* the memory_limit, it will need to be adjusted. */
lmb_reserve(base, size);
phyp_dump_info->init_reserve_start = base;
phyp_dump_info->init_reserve_size = size;
} else {
size = phyp_dump_info->cpu_state_size +
phyp_dump_info->hpte_region_size +
PHYP_DUMP_RMR_END;
base = lmb_end_of_DRAM() - size;
lmb_reserve(base, size);
phyp_dump_info->init_reserve_start = base;
phyp_dump_info->init_reserve_size = size;
}
}
#else
static inline void __init phyp_dump_reserve_mem(void) {}
#endif /* CONFIG_PHYP_DUMP && CONFIG_PPC_RTAS */
void __init early_init_devtree(void *params)
{
DBG(" -> early_init_devtree(%p)\n", params);
@@ -1052,6 +1098,11 @@ void __init early_init_devtree(void *params)
of_scan_flat_dt(early_init_dt_scan_rtas, NULL);
#endif
#ifdef CONFIG_PHYP_DUMP
/* scan tree to see if dump occured during last boot */
of_scan_flat_dt(early_init_dt_scan_phyp_dump, NULL);
#endif
/* Retrieve various informations from the /chosen node of the
* device-tree, including the platform type, initrd location and
* size, TCE reserve, and more ...
@@ -1072,6 +1123,7 @@ void __init early_init_devtree(void *params)
reserve_kdump_trampoline();
reserve_crashkernel();
early_reserve_mem();
phyp_dump_reserve_mem();
lmb_enforce_memory_limit(memory_limit);
lmb_analyze();