static int tlb_seq_show()

in mm/tlb-debugfs.c [39:135]

• 79 lines of code
• 11 McCabe index (conditional complexity)

static int tlb_seq_show(struct seq_file *file, void *iter)
{
	unsigned int tlb_type = (unsigned int)file->private;
	unsigned long addr1, addr2, data1, data2;
	unsigned long flags;
	unsigned long mmucr;
	unsigned int nentries, entry;
	unsigned int urb;

	mmucr = __raw_readl(MMUCR);
	if ((mmucr & 0x1) == 0) {
		seq_printf(file, "address translation disabled\n");
		return 0;
	}

	if (tlb_type == TLB_TYPE_ITLB) {
		addr1 = MMU_ITLB_ADDRESS_ARRAY;
		addr2 = MMU_ITLB_ADDRESS_ARRAY2;
		data1 = MMU_ITLB_DATA_ARRAY;
		data2 = MMU_ITLB_DATA_ARRAY2;
		nentries = 4;
	} else {
		addr1 = MMU_UTLB_ADDRESS_ARRAY;
		addr2 = MMU_UTLB_ADDRESS_ARRAY2;
		data1 = MMU_UTLB_DATA_ARRAY;
		data2 = MMU_UTLB_DATA_ARRAY2;
		nentries = 64;
	}

	local_irq_save(flags);
	jump_to_uncached();

	urb = (mmucr & MMUCR_URB) >> MMUCR_URB_SHIFT;

	/* Make the "entry >= urb" test fail. */
	if (urb == 0)
		urb = MMUCR_URB_NENTRIES + 1;

	if (tlb_type == TLB_TYPE_ITLB) {
		addr1 = MMU_ITLB_ADDRESS_ARRAY;
		addr2 = MMU_ITLB_ADDRESS_ARRAY2;
		data1 = MMU_ITLB_DATA_ARRAY;
		data2 = MMU_ITLB_DATA_ARRAY2;
		nentries = 4;
	} else {
		addr1 = MMU_UTLB_ADDRESS_ARRAY;
		addr2 = MMU_UTLB_ADDRESS_ARRAY2;
		data1 = MMU_UTLB_DATA_ARRAY;
		data2 = MMU_UTLB_DATA_ARRAY2;
		nentries = 64;
	}

	seq_printf(file, "entry:     vpn        ppn     asid  size valid wired\n");

	for (entry = 0; entry < nentries; entry++) {
		unsigned long vpn, ppn, asid, size;
		unsigned long valid;
		unsigned long val;
		const char *sz = "    ?";
		int i;

		val = __raw_readl(addr1 | (entry << MMU_TLB_ENTRY_SHIFT));
		ctrl_barrier();
		vpn = val & 0xfffffc00;
		valid = val & 0x100;

		val = __raw_readl(addr2 | (entry << MMU_TLB_ENTRY_SHIFT));
		ctrl_barrier();
		asid = val & MMU_CONTEXT_ASID_MASK;

		val = __raw_readl(data1 | (entry << MMU_TLB_ENTRY_SHIFT));
		ctrl_barrier();
		ppn = (val & 0x0ffffc00) << 4;

		val = __raw_readl(data2 | (entry << MMU_TLB_ENTRY_SHIFT));
		ctrl_barrier();
		size = (val & 0xf0) >> 4;

		for (i = 0; i < ARRAY_SIZE(tlb_sizes); i++) {
			if (tlb_sizes[i].bits == size)
				break;
		}

		if (i != ARRAY_SIZE(tlb_sizes))
			sz = tlb_sizes[i].size;

		seq_printf(file, "%2d:    0x%08lx 0x%08lx %5lu %s   %s     %s\n",
			   entry, vpn, ppn, asid,
			   sz, valid ? "V" : "-",
			   (urb <= entry) ? "W" : "-");
	}

	back_to_cached();
	local_irq_restore(flags);

	return 0;
}