diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/memtrace.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/memtrace.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/memtrace.c b/arch/powerpc/platforms/powernv/memtrace.c index 5fc9408bb0b3..019669eb21d2 100644 --- a/arch/powerpc/platforms/powernv/memtrace.c +++ b/arch/powerpc/platforms/powernv/memtrace.c @@ -19,6 +19,7 @@ #include <linux/numa.h> #include <asm/machdep.h> #include <asm/debugfs.h> +#include <asm/cacheflush.h> /* This enables us to keep track of the memory removed from each node. */ struct memtrace_entry { @@ -51,6 +52,27 @@ static const struct file_operations memtrace_fops = { .open = simple_open, }; +#define FLUSH_CHUNK_SIZE SZ_1G +/** + * flush_dcache_range_chunked(): Write any modified data cache blocks out to + * memory and invalidate them, in chunks of up to FLUSH_CHUNK_SIZE + * Does not invalidate the corresponding instruction cache blocks. + * + * @start: the start address + * @stop: the stop address (exclusive) + * @chunk: the max size of the chunks + */ +static void flush_dcache_range_chunked(unsigned long start, unsigned long stop, + unsigned long chunk) +{ + unsigned long i; + + for (i = start; i < stop; i += chunk) { + flush_dcache_range(i, min(stop, i + chunk)); + cond_resched(); + } +} + static void memtrace_clear_range(unsigned long start_pfn, unsigned long nr_pages) { @@ -62,6 +84,13 @@ static void memtrace_clear_range(unsigned long start_pfn, cond_resched(); clear_page(__va(PFN_PHYS(pfn))); } + /* + * Before we go ahead and use this range as cache inhibited range + * flush the cache. + */ + flush_dcache_range_chunked(PFN_PHYS(start_pfn), + PFN_PHYS(start_pfn + nr_pages), + FLUSH_CHUNK_SIZE); } static u64 memtrace_alloc_node(u32 nid, u64 size) |