sh: tlb debugfs support.
Export the status of the utlb and itlb entries through debugfs. Signed-off-by: Matt Fleming <matt@console-pimps.org> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Matt Fleming
Paul Mundt
parent
4bea3418c7
commit
6ae6650232
3 changed files with 191 additions and 3 deletions
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@ -19,10 +19,17 @@
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#define MMUCR 0xFF000010 /* MMU Control Register */
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#define MMU_TLB_ENTRY_SHIFT 8
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#define MMU_ITLB_ADDRESS_ARRAY 0xF2000000
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#define MMU_ITLB_ADDRESS_ARRAY2 0xF2800000
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#define MMU_ITLB_DATA_ARRAY 0xF3000000
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#define MMU_ITLB_DATA_ARRAY2 0xF3800000
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#define MMU_UTLB_ADDRESS_ARRAY 0xF6000000
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#define MMU_UTLB_ADDRESS_ARRAY2 0xF6800000
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#define MMU_UTLB_DATA_ARRAY 0xF7000000
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#define MMU_UTLB_DATA_ARRAY2 0xF7800000
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#define MMU_PAGE_ASSOC_BIT 0x80
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#define MMUCR_TI (1<<2)
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@ -18,13 +18,14 @@ mmu-$(CONFIG_MMU) := extable_$(BITS).o fault_$(BITS).o \
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ioremap.o kmap.o pgtable.o tlbflush_$(BITS).o
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obj-y += $(mmu-y)
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obj-$(CONFIG_DEBUG_FS) += asids-debugfs.o
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ifdef CONFIG_DEBUG_FS
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obj-$(CONFIG_CPU_SH4) += cache-debugfs.o
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debugfs-y := asids-debugfs.o
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ifndef CONFIG_CACHE_OFF
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debugfs-$(CONFIG_CPU_SH4) += cache-debugfs.o
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endif
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ifdef CONFIG_MMU
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debugfs-$(CONFIG_CPU_SH4) += tlb-debugfs.o
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tlb-$(CONFIG_CPU_SH3) := tlb-sh3.o
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tlb-$(CONFIG_CPU_SH4) := tlb-sh4.o tlb-urb.o
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tlb-$(CONFIG_CPU_SH5) := tlb-sh5.o
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@ -32,6 +33,7 @@ tlb-$(CONFIG_CPU_HAS_PTEAEX) := tlb-pteaex.o tlb-urb.o
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obj-y += $(tlb-y)
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endif
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obj-$(CONFIG_DEBUG_FS) += $(debugfs-y)
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obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
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obj-$(CONFIG_PMB) += pmb.o
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obj-$(CONFIG_NUMA) += numa.o
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179
arch/sh/mm/tlb-debugfs.c
Normal file
179
arch/sh/mm/tlb-debugfs.c
Normal file
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@ -0,0 +1,179 @@
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/*
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* arch/sh/mm/tlb-debugfs.c
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*
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* debugfs ops for SH-4 ITLB/UTLBs.
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*
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* Copyright (C) 2010 Matt Fleming
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <asm/processor.h>
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#include <asm/mmu_context.h>
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#include <asm/tlbflush.h>
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enum tlb_type {
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TLB_TYPE_ITLB,
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TLB_TYPE_UTLB,
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};
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static struct {
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int bits;
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const char *size;
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} tlb_sizes[] = {
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{ 0x0, " 1KB" },
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{ 0x1, " 4KB" },
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{ 0x2, " 8KB" },
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{ 0x4, " 64KB" },
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{ 0x5, "256KB" },
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{ 0x7, " 1MB" },
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{ 0x8, " 4MB" },
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{ 0xc, " 64MB" },
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};
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static int tlb_seq_show(struct seq_file *file, void *iter)
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{
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unsigned int tlb_type = (unsigned int)file->private;
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unsigned long addr1, addr2, data1, data2;
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unsigned long flags;
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unsigned long mmucr;
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unsigned int nentries, entry;
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unsigned int urb;
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mmucr = __raw_readl(MMUCR);
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if ((mmucr & 0x1) == 0) {
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seq_printf(file, "address translation disabled\n");
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return 0;
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}
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if (tlb_type == TLB_TYPE_ITLB) {
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addr1 = MMU_ITLB_ADDRESS_ARRAY;
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addr2 = MMU_ITLB_ADDRESS_ARRAY2;
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data1 = MMU_ITLB_DATA_ARRAY;
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data2 = MMU_ITLB_DATA_ARRAY2;
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nentries = 4;
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} else {
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addr1 = MMU_UTLB_ADDRESS_ARRAY;
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addr2 = MMU_UTLB_ADDRESS_ARRAY2;
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data1 = MMU_UTLB_DATA_ARRAY;
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data2 = MMU_UTLB_DATA_ARRAY2;
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nentries = 64;
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}
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local_irq_save(flags);
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jump_to_uncached();
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urb = (mmucr & MMUCR_URB) >> MMUCR_URB_SHIFT;
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/* Make the "entry >= urb" test fail. */
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if (urb == 0)
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urb = MMUCR_URB_NENTRIES + 1;
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if (tlb_type == TLB_TYPE_ITLB) {
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addr1 = MMU_ITLB_ADDRESS_ARRAY;
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addr2 = MMU_ITLB_ADDRESS_ARRAY2;
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data1 = MMU_ITLB_DATA_ARRAY;
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data2 = MMU_ITLB_DATA_ARRAY2;
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nentries = 4;
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} else {
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addr1 = MMU_UTLB_ADDRESS_ARRAY;
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addr2 = MMU_UTLB_ADDRESS_ARRAY2;
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data1 = MMU_UTLB_DATA_ARRAY;
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data2 = MMU_UTLB_DATA_ARRAY2;
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nentries = 64;
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}
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seq_printf(file, "entry: vpn ppn asid size valid wired\n");
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for (entry = 0; entry < nentries; entry++) {
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unsigned long vpn, ppn, asid, size;
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unsigned long valid;
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unsigned long val;
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const char *sz = " ?";
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int i;
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val = __raw_readl(addr1 | (entry << MMU_TLB_ENTRY_SHIFT));
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ctrl_barrier();
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vpn = val & 0xfffffc00;
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valid = val & 0x100;
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val = __raw_readl(addr2 | (entry << MMU_TLB_ENTRY_SHIFT));
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ctrl_barrier();
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asid = val & MMU_CONTEXT_ASID_MASK;
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val = __raw_readl(data1 | (entry << MMU_TLB_ENTRY_SHIFT));
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ctrl_barrier();
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ppn = (val & 0x0ffffc00) << 4;
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val = __raw_readl(data2 | (entry << MMU_TLB_ENTRY_SHIFT));
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ctrl_barrier();
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size = (val & 0xf0) >> 4;
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for (i = 0; i < ARRAY_SIZE(tlb_sizes); i++) {
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if (tlb_sizes[i].bits == size)
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break;
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}
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if (i != ARRAY_SIZE(tlb_sizes))
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sz = tlb_sizes[i].size;
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seq_printf(file, "%2d: 0x%08lx 0x%08lx %5lu %s %s %s\n",
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entry, vpn, ppn, asid,
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sz, valid ? "V" : "-",
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(urb <= entry) ? "W" : "-");
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}
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back_to_cached();
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local_irq_restore(flags);
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return 0;
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}
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static int tlb_debugfs_open(struct inode *inode, struct file *file)
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{
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return single_open(file, tlb_seq_show, inode->i_private);
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}
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static const struct file_operations tlb_debugfs_fops = {
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.owner = THIS_MODULE,
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.open = tlb_debugfs_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int __init tlb_debugfs_init(void)
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{
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struct dentry *itlb, *utlb;
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itlb = debugfs_create_file("itlb", S_IRUSR, sh_debugfs_root,
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(unsigned int *)TLB_TYPE_ITLB,
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&tlb_debugfs_fops);
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if (unlikely(!itlb))
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return -ENOMEM;
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if (IS_ERR(itlb))
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return PTR_ERR(itlb);
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utlb = debugfs_create_file("utlb", S_IRUSR, sh_debugfs_root,
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(unsigned int *)TLB_TYPE_UTLB,
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&tlb_debugfs_fops);
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if (unlikely(!utlb)) {
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debugfs_remove(itlb);
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return -ENOMEM;
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}
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if (IS_ERR(utlb)) {
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debugfs_remove(itlb);
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return PTR_ERR(utlb);
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}
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return 0;
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}
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module_init(tlb_debugfs_init);
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MODULE_LICENSE("GPL v2");
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