static int cache_debugfs_show()

in mm/cache-debugfs.c [25:95]

• 46 lines of code
• 9 McCabe index (conditional complexity)

static int cache_debugfs_show(struct seq_file *file, void *iter)
{
	unsigned int cache_type = (unsigned int)file->private;
	struct cache_info *cache;
	unsigned int waysize, way;
	unsigned long ccr;
	unsigned long addrstart = 0;

	/*
	 * Go uncached immediately so we don't skew the results any
	 * more than we already are..
	 */
	jump_to_uncached();

	ccr = __raw_readl(SH_CCR);
	if ((ccr & CCR_CACHE_ENABLE) == 0) {
		back_to_cached();

		seq_printf(file, "disabled\n");
		return 0;
	}

	if (cache_type == CACHE_TYPE_DCACHE) {
		addrstart = CACHE_OC_ADDRESS_ARRAY;
		cache = &current_cpu_data.dcache;
	} else {
		addrstart = CACHE_IC_ADDRESS_ARRAY;
		cache = &current_cpu_data.icache;
	}

	waysize = cache->sets;

	/*
	 * If the OC is already in RAM mode, we only have
	 * half of the entries to consider..
	 */
	if ((ccr & CCR_CACHE_ORA) && cache_type == CACHE_TYPE_DCACHE)
		waysize >>= 1;

	waysize <<= cache->entry_shift;

	for (way = 0; way < cache->ways; way++) {
		unsigned long addr;
		unsigned int line;

		seq_printf(file, "-----------------------------------------\n");
		seq_printf(file, "Way %d\n", way);
		seq_printf(file, "-----------------------------------------\n");

		for (addr = addrstart, line = 0;
		     addr < addrstart + waysize;
		     addr += cache->linesz, line++) {
			unsigned long data = __raw_readl(addr);

			/* Check the V bit, ignore invalid cachelines */
			if ((data & 1) == 0)
				continue;

			/* U: Dirty, cache tag is 10 bits up */
			seq_printf(file, "%3d: %c 0x%lx\n",
				   line, data & 2 ? 'U' : ' ',
				   data & 0x1ffffc00);
		}

		addrstart += cache->way_incr;
	}

	back_to_cached();

	return 0;
}