diff options
| -rw-r--r-- | arch/powerpc/kernel/fadump.c | 65 |
1 files changed, 54 insertions, 11 deletions
diff --git a/arch/powerpc/kernel/fadump.c b/arch/powerpc/kernel/fadump.c index a356813..3079518 100644 --- a/arch/powerpc/kernel/fadump.c +++ b/arch/powerpc/kernel/fadump.c @@ -1152,28 +1152,71 @@ void fadump_cleanup(void) } } +static void fadump_free_reserved_memory(unsigned long start_pfn, + unsigned long end_pfn) +{ + unsigned long pfn; + unsigned long time_limit = jiffies + HZ; + + pr_info("freeing reserved memory (0x%llx - 0x%llx)\n", + PFN_PHYS(start_pfn), PFN_PHYS(end_pfn)); + + for (pfn = start_pfn; pfn < end_pfn; pfn++) { + free_reserved_page(pfn_to_page(pfn)); + + if (time_after(jiffies, time_limit)) { + cond_resched(); + time_limit = jiffies + HZ; + } + } +} + +/* + * Skip memory holes and free memory that was actually reserved. + */ +static void fadump_release_reserved_area(unsigned long start, unsigned long end) +{ + struct memblock_region *reg; + unsigned long tstart, tend; + unsigned long start_pfn = PHYS_PFN(start); + unsigned long end_pfn = PHYS_PFN(end); + + for_each_memblock(memory, reg) { + tstart = max(start_pfn, memblock_region_memory_base_pfn(reg)); + tend = min(end_pfn, memblock_region_memory_end_pfn(reg)); + if (tstart < tend) { + fadump_free_reserved_memory(tstart, tend); + + if (tend == end_pfn) + break; + + start_pfn = tend + 1; + } + } +} + /* * Release the memory that was reserved in early boot to preserve the memory * contents. The released memory will be available for general use. */ static void fadump_release_memory(unsigned long begin, unsigned long end) { - unsigned long addr; unsigned long ra_start, ra_end; ra_start = fw_dump.reserve_dump_area_start; ra_end = ra_start + fw_dump.reserve_dump_area_size; - for (addr = begin; addr < end; addr += PAGE_SIZE) { - /* - * exclude the dump reserve area. Will reuse it for next - * fadump registration. - */ - if (addr <= ra_end && ((addr + PAGE_SIZE) > ra_start)) - continue; - - free_reserved_page(pfn_to_page(addr >> PAGE_SHIFT)); - } + /* + * exclude the dump reserve area. Will reuse it for next + * fadump registration. + */ + if (begin < ra_end && end > ra_start) { + if (begin < ra_start) + fadump_release_reserved_area(begin, ra_start); + if (end > ra_end) + fadump_release_reserved_area(ra_end, end); + } else + fadump_release_reserved_area(begin, end); } static void fadump_invalidate_release_mem(void) |
