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160 lines
3.7 KiB
160 lines
3.7 KiB
/* |
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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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debugfs_create_file("itlb", S_IRUSR, arch_debugfs_dir, |
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(void *)TLB_TYPE_ITLB, &tlb_debugfs_fops); |
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debugfs_create_file("utlb", S_IRUSR, arch_debugfs_dir, |
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(void *)TLB_TYPE_UTLB, &tlb_debugfs_fops); |
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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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