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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/lib/dump_tlb.c
10817 views
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/*

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 * Dump R4x00 TLB for debugging purposes.

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 *

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 * Copyright (C) 1994, 1995 by Waldorf Electronics, written by Ralf Baechle.

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 * Copyright (C) 1999 by Silicon Graphics, Inc.

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 */

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#include <linux/kernel.h>

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#include <linux/mm.h>

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#include <asm/mipsregs.h>

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#include <asm/page.h>

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#include <asm/pgtable.h>

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#include <asm/tlbdebug.h>

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static inline const char *msk2str(unsigned int mask)

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{

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	switch (mask) {

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	case PM_4K:	return "4kb";

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	case PM_16K:	return "16kb";

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	case PM_64K:	return "64kb";

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	case PM_256K:	return "256kb";

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#ifdef CONFIG_CPU_CAVIUM_OCTEON

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	case PM_8K:	return "8kb";

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	case PM_32K:	return "32kb";

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	case PM_128K:	return "128kb";

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	case PM_512K:	return "512kb";

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	case PM_2M:	return "2Mb";

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	case PM_8M:	return "8Mb";

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	case PM_32M:	return "32Mb";

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#endif

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#ifndef CONFIG_CPU_VR41XX

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	case PM_1M:	return "1Mb";

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	case PM_4M:	return "4Mb";

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	case PM_16M:	return "16Mb";

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	case PM_64M:	return "64Mb";

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	case PM_256M:	return "256Mb";

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	case PM_1G:	return "1Gb";

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#endif

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	}

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	return "";

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}

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#define BARRIER()					\

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	__asm__ __volatile__(				\

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		".set\tnoreorder\n\t"			\

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		"nop;nop;nop;nop;nop;nop;nop\n\t"	\

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		".set\treorder");

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static void dump_tlb(int first, int last)

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{

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	unsigned long s_entryhi, entryhi, asid;

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	unsigned long long entrylo0, entrylo1;

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	unsigned int s_index, pagemask, c0, c1, i;

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	s_entryhi = read_c0_entryhi();

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	s_index = read_c0_index();

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	asid = s_entryhi & 0xff;

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	for (i = first; i <= last; i++) {

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		write_c0_index(i);

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		BARRIER();

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		tlb_read();

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		BARRIER();

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		pagemask = read_c0_pagemask();

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		entryhi  = read_c0_entryhi();

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		entrylo0 = read_c0_entrylo0();

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		entrylo1 = read_c0_entrylo1();

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		/* Unused entries have a virtual address of CKSEG0.  */

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		if ((entryhi & ~0x1ffffUL) != CKSEG0

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		    && (entryhi & 0xff) == asid) {

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#ifdef CONFIG_32BIT

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			int width = 8;

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#else

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			int width = 11;

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#endif

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			/*

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			 * Only print entries in use

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			 */

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			printk("Index: %2d pgmask=%s ", i, msk2str(pagemask));

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			c0 = (entrylo0 >> 3) & 7;

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			c1 = (entrylo1 >> 3) & 7;

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			printk("va=%0*lx asid=%02lx\n",

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			       width, (entryhi & ~0x1fffUL),

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			       entryhi & 0xff);

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			printk("\t[pa=%0*llx c=%d d=%d v=%d g=%d] ",

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			       width,

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			       (entrylo0 << 6) & PAGE_MASK, c0,

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			       (entrylo0 & 4) ? 1 : 0,

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			       (entrylo0 & 2) ? 1 : 0,

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			       (entrylo0 & 1) ? 1 : 0);

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			printk("[pa=%0*llx c=%d d=%d v=%d g=%d]\n",

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			       width,

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			       (entrylo1 << 6) & PAGE_MASK, c1,

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			       (entrylo1 & 4) ? 1 : 0,

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			       (entrylo1 & 2) ? 1 : 0,

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			       (entrylo1 & 1) ? 1 : 0);

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		}

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	}

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	printk("\n");

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	write_c0_entryhi(s_entryhi);

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	write_c0_index(s_index);

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}

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void dump_tlb_all(void)

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{

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	dump_tlb(0, current_cpu_data.tlbsize - 1);

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}

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