diff options
Diffstat (limited to 'arch/powerpc/kernel/crash_dump.c')
| -rw-r--r-- | arch/powerpc/kernel/crash_dump.c | 101 |
1 files changed, 69 insertions, 32 deletions
diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c index 211d72653ea..7a13f378ca2 100644 --- a/arch/powerpc/kernel/crash_dump.c +++ b/arch/powerpc/kernel/crash_dump.c @@ -13,10 +13,13 @@ #include <linux/crash_dump.h> #include <linux/bootmem.h> +#include <linux/memblock.h> +#include <asm/code-patching.h> #include <asm/kdump.h> -#include <asm/lmb.h> +#include <asm/prom.h> #include <asm/firmware.h> #include <asm/uaccess.h> +#include <asm/rtas.h> #ifdef DEBUG #include <asm/udbg.h> @@ -25,8 +28,16 @@ #define DBG(fmt...) #endif +#ifndef CONFIG_NONSTATIC_KERNEL +void __init reserve_kdump_trampoline(void) +{ + memblock_reserve(0, KDUMP_RESERVE_LIMIT); +} + static void __init create_trampoline(unsigned long addr) { + unsigned int *p = (unsigned int *)addr; + /* The maximum range of a single instruction branch, is the current * instruction's address + (32 MB - 4) bytes. For the trampoline we * need to branch to current address + 32 MB. So we insert a nop at @@ -35,47 +46,42 @@ static void __init create_trampoline(unsigned long addr) * branch to "addr" we jump to ("addr" + 32 MB). Although it requires * two instructions it doesn't require any registers. */ - create_instruction(addr, 0x60000000); /* nop */ - create_branch(addr + 4, addr + PHYSICAL_START, 0); + patch_instruction(p, PPC_INST_NOP); + patch_branch(++p, addr + PHYSICAL_START, 0); } -void __init kdump_setup(void) +void __init setup_kdump_trampoline(void) { unsigned long i; - DBG(" -> kdump_setup()\n"); + DBG(" -> setup_kdump_trampoline()\n"); for (i = KDUMP_TRAMPOLINE_START; i < KDUMP_TRAMPOLINE_END; i += 8) { create_trampoline(i); } +#ifdef CONFIG_PPC_PSERIES create_trampoline(__pa(system_reset_fwnmi) - PHYSICAL_START); create_trampoline(__pa(machine_check_fwnmi) - PHYSICAL_START); +#endif /* CONFIG_PPC_PSERIES */ - DBG(" <- kdump_setup()\n"); -} - -#ifdef CONFIG_PROC_VMCORE -static int __init parse_elfcorehdr(char *p) -{ - if (p) - elfcorehdr_addr = memparse(p, &p); - - return 0; + DBG(" <- setup_kdump_trampoline()\n"); } -__setup("elfcorehdr=", parse_elfcorehdr); -#endif +#endif /* CONFIG_NONSTATIC_KERNEL */ -static int __init parse_savemaxmem(char *p) +static size_t copy_oldmem_vaddr(void *vaddr, char *buf, size_t csize, + unsigned long offset, int userbuf) { - if (p) - saved_max_pfn = (memparse(p, &p) >> PAGE_SHIFT) - 1; + if (userbuf) { + if (copy_to_user((char __user *)buf, (vaddr + offset), csize)) + return -EFAULT; + } else + memcpy(buf, (vaddr + offset), csize); - return 0; + return csize; } -__setup("savemaxmem=", parse_savemaxmem); -/* +/** * copy_oldmem_page - copy one page from "oldmem" * @pfn: page frame number to be copied * @buf: target memory address for the copy; this can be in kernel address @@ -92,20 +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; - vaddr = __ioremap(pfn << PAGE_SHIFT, PAGE_SIZE, 0); + csize = min_t(size_t, csize, PAGE_SIZE); + paddr = pfn << PAGE_SHIFT; - if (userbuf) { - if (copy_to_user((char __user *)buf, (vaddr + offset), csize)) { - iounmap(vaddr); - return -EFAULT; - } - } else - memcpy(buf, (vaddr + offset), csize); + if (memblock_is_region_memory(paddr, csize)) { + vaddr = __va(paddr); + csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf); + } else { + vaddr = __ioremap(paddr, PAGE_SIZE, 0); + csize = copy_oldmem_vaddr(vaddr, buf, csize, offset, userbuf); + iounmap(vaddr); + } - 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 |