diff options
Diffstat (limited to 'arch/powerpc/kernel/crash_dump.c')
| -rw-r--r-- | arch/powerpc/kernel/crash_dump.c | 69 |
1 files changed, 37 insertions, 32 deletions
diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c index 8e05c16344e..7a13f378ca2 100644 --- a/arch/powerpc/kernel/crash_dump.c +++ b/arch/powerpc/kernel/crash_dump.c @@ -19,6 +19,7 @@ #include <asm/prom.h> #include <asm/firmware.h> #include <asm/uaccess.h> +#include <asm/rtas.h> #ifdef DEBUG #include <asm/udbg.h> @@ -27,10 +28,7 @@ #define DBG(fmt...) #endif -/* Stores the physical address of elf header of crash image. */ -unsigned long long elfcorehdr_addr = ELFCORE_ADDR_MAX; - -#ifndef CONFIG_RELOCATABLE +#ifndef CONFIG_NONSTATIC_KERNEL void __init reserve_kdump_trampoline(void) { memblock_reserve(0, KDUMP_RESERVE_LIMIT); @@ -69,31 +67,7 @@ void __init setup_kdump_trampoline(void) DBG(" <- setup_kdump_trampoline()\n"); } -#endif /* CONFIG_RELOCATABLE */ - -/* - * Note: elfcorehdr_addr is not just limited to vmcore. It is also used by - * is_kdump_kernel() to determine if we are booting after a panic. Hence - * ifdef it under CONFIG_CRASH_DUMP and not CONFIG_PROC_VMCORE. - */ -static int __init parse_elfcorehdr(char *p) -{ - if (p) - elfcorehdr_addr = memparse(p, &p); - - return 1; -} -__setup("elfcorehdr=", parse_elfcorehdr); - -static int __init parse_savemaxmem(char *p) -{ - if (p) - saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1; - - return 1; -} -__setup("savemaxmem=", parse_savemaxmem); - +#endif /* CONFIG_NONSTATIC_KERNEL */ static size_t copy_oldmem_vaddr(void *vaddr, char *buf, size_t csize, unsigned long offset, int userbuf) @@ -124,20 +98,51 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf, size_t csize, unsigned long offset, int userbuf) { void *vaddr; + phys_addr_t paddr; if (!csize) return 0; csize = min_t(size_t, csize, PAGE_SIZE); + paddr = pfn << PAGE_SHIFT; - if ((min_low_pfn < pfn) && (pfn < max_pfn)) { - vaddr = __va(pfn << PAGE_SHIFT); + if (memblock_is_region_memory(paddr, csize)) { + vaddr = __va(paddr); csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf); } else { - vaddr = __ioremap(pfn << PAGE_SHIFT, PAGE_SIZE, 0); + vaddr = __ioremap(paddr, PAGE_SIZE, 0); csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf); iounmap(vaddr); } return csize; } + +#ifdef CONFIG_PPC_RTAS +/* + * The crashkernel region will almost always overlap the RTAS region, so + * we have to be careful when shrinking the crashkernel region. + */ +void crash_free_reserved_phys_range(unsigned long begin, unsigned long end) +{ + unsigned long addr; + const __be32 *basep, *sizep; + unsigned int rtas_start = 0, rtas_end = 0; + + basep = of_get_property(rtas.dev, "linux,rtas-base", NULL); + sizep = of_get_property(rtas.dev, "rtas-size", NULL); + + if (basep && sizep) { + rtas_start = be32_to_cpup(basep); + rtas_end = rtas_start + be32_to_cpup(sizep); + } + + for (addr = begin; addr < end; addr += PAGE_SIZE) { + /* Does this page overlap with the RTAS region? */ + if (addr <= rtas_end && ((addr + PAGE_SIZE) > rtas_start)) + continue; + + free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT)); + } +} +#endif |