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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/loongarch/lib/dump_tlb.c
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// SPDX-License-Identifier: GPL-2.0

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/*

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 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited

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 *

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 * Derived from MIPS:

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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/loongarch.h>

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#include <asm/page.h>

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#include <asm/pgtable.h>

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#include <asm/tlb.h>

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void dump_tlb_regs(void)

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{

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	const int field = 2 * sizeof(unsigned long);

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	pr_info("Index    : 0x%0x\n", read_csr_tlbidx());

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	pr_info("PageSize : 0x%0x\n", read_csr_pagesize());

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	pr_info("EntryHi  : 0x%0*lx\n", field, read_csr_entryhi());

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	pr_info("EntryLo0 : 0x%0*lx\n", field, read_csr_entrylo0());

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	pr_info("EntryLo1 : 0x%0*lx\n", field, read_csr_entrylo1());

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}

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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, pa;

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	unsigned int index;

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	unsigned int s_index, s_asid;

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	unsigned int pagesize, c0, c1, i;

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	unsigned long asidmask = cpu_asid_mask(&current_cpu_data);

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	int pwidth = 16;

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	int vwidth = 16;

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	int asidwidth = DIV_ROUND_UP(ilog2(asidmask) + 1, 4);

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	s_entryhi = read_csr_entryhi();

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	s_index = read_csr_tlbidx();

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	s_asid = read_csr_asid();

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

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		write_csr_index(i);

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		tlb_read();

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		pagesize = read_csr_pagesize();

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		entryhi	 = read_csr_entryhi();

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		entrylo0 = read_csr_entrylo0();

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		entrylo1 = read_csr_entrylo1();

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		index = read_csr_tlbidx();

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		asid = read_csr_asid();

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		/* EHINV bit marks entire entry as invalid */

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		if (index & CSR_TLBIDX_EHINV)

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			continue;

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		/*

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		 * ASID takes effect in absence of G (global) bit.

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		 */

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		if (!((entrylo0 | entrylo1) & ENTRYLO_G) &&

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		    asid != s_asid)

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			continue;

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		/*

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		 * Only print entries in use

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		 */

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		pr_info("Index: %4d pgsize=0x%x ", i, (1 << pagesize));

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		c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;

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		c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;

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		pr_cont("va=0x%0*lx asid=0x%0*lx",

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			vwidth, (entryhi & ~0x1fffUL), asidwidth, asid & asidmask);

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		/* NR/NX are in awkward places, so mask them off separately */

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		pa = entrylo0 & ~(ENTRYLO_NR | ENTRYLO_NX);

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		pa = pa & PAGE_MASK;

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		pr_cont("\n\t[");

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		pr_cont("nr=%d nx=%d ",

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			(entrylo0 & ENTRYLO_NR) ? 1 : 0,

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			(entrylo0 & ENTRYLO_NX) ? 1 : 0);

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		pr_cont("pa=0x%0*llx c=%d d=%d v=%d g=%d plv=%lld] [",

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			pwidth, pa, c0,

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			(entrylo0 & ENTRYLO_D) ? 1 : 0,

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			(entrylo0 & ENTRYLO_V) ? 1 : 0,

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			(entrylo0 & ENTRYLO_G) ? 1 : 0,

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			(entrylo0 & ENTRYLO_PLV) >> ENTRYLO_PLV_SHIFT);

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		/* NR/NX are in awkward places, so mask them off separately */

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		pa = entrylo1 & ~(ENTRYLO_NR | ENTRYLO_NX);

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		pa = pa & PAGE_MASK;

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		pr_cont("nr=%d nx=%d ",

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			(entrylo1 & ENTRYLO_NR) ? 1 : 0,

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			(entrylo1 & ENTRYLO_NX) ? 1 : 0);

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		pr_cont("pa=0x%0*llx c=%d d=%d v=%d g=%d plv=%lld]\n",

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			pwidth, pa, c1,

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			(entrylo1 & ENTRYLO_D) ? 1 : 0,

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			(entrylo1 & ENTRYLO_V) ? 1 : 0,

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			(entrylo1 & ENTRYLO_G) ? 1 : 0,

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			(entrylo1 & ENTRYLO_PLV) >> ENTRYLO_PLV_SHIFT);

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	}

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	pr_info("\n");

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	write_csr_entryhi(s_entryhi);

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	write_csr_tlbidx(s_index);

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	write_csr_asid(s_asid);

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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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