sh: tlb debugfs support. (6ae66502) · Commits · e / devices / android_kernel_oneplus_sm8150

arch/sh/include/cpu-sh4/cpu/mmu_context.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -19,10 +19,17 @@

		#define MMUCR 0xFF000010 /* MMU Control Register */

		#define MMU_TLB_ENTRY_SHIFT 8

		#define MMU_ITLB_ADDRESS_ARRAY 0xF2000000
		#define MMU_ITLB_ADDRESS_ARRAY2 0xF2800000
		#define MMU_ITLB_DATA_ARRAY 0xF3000000
		#define MMU_ITLB_DATA_ARRAY2 0xF3800000

		#define MMU_UTLB_ADDRESS_ARRAY 0xF6000000
		#define MMU_UTLB_ADDRESS_ARRAY2 0xF6800000
		#define MMU_UTLB_DATA_ARRAY 0xF7000000
		#define MMU_UTLB_DATA_ARRAY2 0xF7800000
		#define MMU_PAGE_ASSOC_BIT 0x80

		#define MMUCR_TI (1<<2)

arch/sh/mm/Makefile

+5 −3

Original line number	Diff line number	Diff line
		@@ -18,13 +18,14 @@ mmu-$(CONFIG_MMU) := extable_$(BITS).o fault_$(BITS).o \
		ioremap.o kmap.o pgtable.o tlbflush_$(BITS).o

		obj-y += $(mmu-y)
		obj-$(CONFIG_DEBUG_FS) += asids-debugfs.o

		ifdef CONFIG_DEBUG_FS
		obj-$(CONFIG_CPU_SH4) += cache-debugfs.o
		debugfs-y := asids-debugfs.o
		ifndef CONFIG_CACHE_OFF
		debugfs-$(CONFIG_CPU_SH4) += cache-debugfs.o
		endif

		ifdef CONFIG_MMU
		debugfs-$(CONFIG_CPU_SH4) += tlb-debugfs.o
		tlb-$(CONFIG_CPU_SH3) := tlb-sh3.o
		tlb-$(CONFIG_CPU_SH4) := tlb-sh4.o tlb-urb.o
		tlb-$(CONFIG_CPU_SH5) := tlb-sh5.o
		@@ -32,6 +33,7 @@ tlb-$(CONFIG_CPU_HAS_PTEAEX) := tlb-pteaex.o tlb-urb.o
		obj-y += $(tlb-y)
		endif

		obj-$(CONFIG_DEBUG_FS) += $(debugfs-y)
		obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
		obj-$(CONFIG_PMB) += pmb.o
		obj-$(CONFIG_NUMA) += numa.o

arch/sh/mm/tlb-debugfs.c

0 → 100644

+179 −0

Original line number	Diff line number	Diff line
		/*
		* arch/sh/mm/tlb-debugfs.c
		*
		* debugfs ops for SH-4 ITLB/UTLBs.
		*
		* Copyright (C) 2010 Matt Fleming
		*
		* This file is subject to the terms and conditions of the GNU General Public
		* License. See the file "COPYING" in the main directory of this archive
		* for more details.
		*/
		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/debugfs.h>
		#include <linux/seq_file.h>
		#include <asm/processor.h>
		#include <asm/mmu_context.h>
		#include <asm/tlbflush.h>

		enum tlb_type {
		TLB_TYPE_ITLB,
		TLB_TYPE_UTLB,
		};

		static struct {
		int bits;
		const char *size;
		} tlb_sizes[] = {
		{ 0x0, " 1KB" },
		{ 0x1, " 4KB" },
		{ 0x2, " 8KB" },
		{ 0x4, " 64KB" },
		{ 0x5, "256KB" },
		{ 0x7, " 1MB" },
		{ 0x8, " 4MB" },
		{ 0xc, " 64MB" },
		};

		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;
		}

		static int tlb_debugfs_open(struct inode inode, struct file file)
		{
		return single_open(file, tlb_seq_show, inode->i_private);
		}

		static const struct file_operations tlb_debugfs_fops = {
		.owner = THIS_MODULE,
		.open = tlb_debugfs_open,
		.read = seq_read,
		.llseek = seq_lseek,
		.release = single_release,
		};

		static int __init tlb_debugfs_init(void)
		{
		struct dentry itlb, utlb;

		itlb = debugfs_create_file("itlb", S_IRUSR, sh_debugfs_root,
		(unsigned int *)TLB_TYPE_ITLB,
		&tlb_debugfs_fops);
		if (unlikely(!itlb))
		return -ENOMEM;
		if (IS_ERR(itlb))
		return PTR_ERR(itlb);

		utlb = debugfs_create_file("utlb", S_IRUSR, sh_debugfs_root,
		(unsigned int *)TLB_TYPE_UTLB,
		&tlb_debugfs_fops);
		if (unlikely(!utlb)) {
		debugfs_remove(itlb);
		return -ENOMEM;
		}

		if (IS_ERR(utlb)) {
		debugfs_remove(itlb);
		return PTR_ERR(utlb);
		}

		return 0;
		}
		module_init(tlb_debugfs_init);

		MODULE_LICENSE("GPL v2");