// SPDX-License-Identifier: GPL-2.0
/*
* Dump R4x00 TLB for debugging purposes .
*
* Copyright ( C ) 1994 , 1995 by Waldorf Electronics , written by Ralf Baechle .
* Copyright ( C ) 1999 by Silicon Graphics , Inc .
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <asm /hazards.h>
#include <asm /mipsregs.h>
#include <asm /mmu_context.h>
#include <asm /page.h>
#include <asm /tlbdebug.h>
void dump_tlb_regs(void )
{
const int field = 2 * sizeof (unsigned long );
pr_info("Index : %0x\n" , read_c0_index());
pr_info("PageMask : %0x\n" , read_c0_pagemask());
if (cpu_has_guestid)
pr_info("GuestCtl1: %0x\n" , read_c0_guestctl1());
pr_info("EntryHi : %0*lx\n" , field, read_c0_entryhi());
pr_info("EntryLo0 : %0*lx\n" , field, read_c0_entrylo0());
pr_info("EntryLo1 : %0*lx\n" , field, read_c0_entrylo1());
pr_info("Wired : %0x\n" , read_c0_wired());
switch (current_cpu_type()) {
case CPU_R10000:
case CPU_R12000:
case CPU_R14000:
case CPU_R16000:
pr_info("FrameMask: %0x\n" , read_c0_framemask());
break ;
}
if (cpu_has_small_pages || cpu_has_rixi || cpu_has_xpa)
pr_info("PageGrain: %0x\n" , read_c0_pagegrain());
if (cpu_has_htw) {
pr_info("PWField : %0*lx\n" , field, read_c0_pwfield());
pr_info("PWSize : %0*lx\n" , field, read_c0_pwsize());
pr_info("PWCtl : %0x\n" , read_c0_pwctl());
}
}
static inline const char *msk2str(unsigned int mask)
{
switch (mask) {
case PM_4K: return "4kb" ;
case PM_16K: return "16kb" ;
case PM_64K: return "64kb" ;
case PM_256K: return "256kb" ;
#ifdef CONFIG_CPU_CAVIUM_OCTEON
case PM_8K: return "8kb" ;
case PM_32K: return "32kb" ;
case PM_128K: return "128kb" ;
case PM_512K: return "512kb" ;
case PM_2M: return "2Mb" ;
case PM_8M: return "8Mb" ;
case PM_32M: return "32Mb" ;
#endif
}
return "" ;
}
static void dump_tlb(int first, int last)
{
unsigned long s_entryhi, entryhi, asid, mmid;
unsigned long long entrylo0, entrylo1, pa;
unsigned int s_index, s_pagemask, s_guestctl1 = 0 ;
unsigned int pagemask, guestctl1 = 0 , c0, c1, i;
unsigned long asidmask = cpu_asid_mask(¤t_cpu_data);
int asidwidth = DIV_ROUND_UP(ilog2(asidmask) + 1 , 4 );
unsigned long s_mmid;
#ifdef CONFIG_32BIT
bool xpa = cpu_has_xpa && (read_c0_pagegrain() & PG_ELPA);
int pwidth = xpa ? 11 : 8 ;
int vwidth = 8 ;
#else
bool xpa = false ;
int pwidth = 11 ;
int vwidth = 11 ;
#endif
s_pagemask = read_c0_pagemask();
s_entryhi = read_c0_entryhi();
s_index = read_c0_index();
if (cpu_has_mmid)
asid = s_mmid = read_c0_memorymapid();
else
asid = s_entryhi & asidmask;
if (cpu_has_guestid)
s_guestctl1 = read_c0_guestctl1();
for (i = first; i <= last; i++) {
write_c0_index(i);
mtc0_tlbr_hazard();
tlb_read();
tlb_read_hazard();
pagemask = read_c0_pagemask();
entryhi = read_c0_entryhi();
entrylo0 = read_c0_entrylo0();
entrylo1 = read_c0_entrylo1();
if (cpu_has_mmid)
mmid = read_c0_memorymapid();
else
mmid = entryhi & asidmask;
if (cpu_has_guestid)
guestctl1 = read_c0_guestctl1();
/* EHINV bit marks entire entry as invalid */
if (cpu_has_tlbinv && entryhi & MIPS_ENTRYHI_EHINV)
continue ;
/*
* Prior to tlbinv , unused entries have a virtual address of
* CKSEG0 .
*/
if ((entryhi & ~0 x1ffffUL) == CKSEG0)
continue ;
/*
* ASID takes effect in absence of G ( global ) bit .
* We check both G bits , even though architecturally they should
* match one another , because some revisions of the SB1 core may
* leave only a single G bit set after a machine check exception
* due to duplicate TLB entry .
*/
if (!((entrylo0 | entrylo1) & ENTRYLO_G) && (mmid != asid))
continue ;
/*
* Only print entries in use
*/
printk("Index: %2d pgmask=%s " , i, msk2str(pagemask));
c0 = (entrylo0 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
c1 = (entrylo1 & ENTRYLO_C) >> ENTRYLO_C_SHIFT;
pr_cont("va=%0*lx asid=%0*lx" ,
vwidth, (entryhi & ~0 x1fffUL),
asidwidth, mmid);
if (cpu_has_guestid)
pr_cont(" gid=%02lx" ,
(guestctl1 & MIPS_GCTL1_RID)
>> MIPS_GCTL1_RID_SHIFT);
/* RI/XI are in awkward places, so mask them off separately */
pa = entrylo0 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
if (xpa)
pa |= (unsigned long long )readx_c0_entrylo0() << 30 ;
pa = (pa << 6 ) & PAGE_MASK;
pr_cont("\n\t[" );
if (cpu_has_rixi)
pr_cont("ri=%d xi=%d " ,
(entrylo0 & MIPS_ENTRYLO_RI) ? 1 : 0 ,
(entrylo0 & MIPS_ENTRYLO_XI) ? 1 : 0 );
pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d] [" ,
pwidth, pa, c0,
(entrylo0 & ENTRYLO_D) ? 1 : 0 ,
(entrylo0 & ENTRYLO_V) ? 1 : 0 ,
(entrylo0 & ENTRYLO_G) ? 1 : 0 );
/* RI/XI are in awkward places, so mask them off separately */
pa = entrylo1 & ~(MIPS_ENTRYLO_RI | MIPS_ENTRYLO_XI);
if (xpa)
pa |= (unsigned long long )readx_c0_entrylo1() << 30 ;
pa = (pa << 6 ) & PAGE_MASK;
if (cpu_has_rixi)
pr_cont("ri=%d xi=%d " ,
(entrylo1 & MIPS_ENTRYLO_RI) ? 1 : 0 ,
(entrylo1 & MIPS_ENTRYLO_XI) ? 1 : 0 );
pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d]\n" ,
pwidth, pa, c1,
(entrylo1 & ENTRYLO_D) ? 1 : 0 ,
(entrylo1 & ENTRYLO_V) ? 1 : 0 ,
(entrylo1 & ENTRYLO_G) ? 1 : 0 );
}
printk("\n" );
write_c0_entryhi(s_entryhi);
write_c0_index(s_index);
write_c0_pagemask(s_pagemask);
if (cpu_has_guestid)
write_c0_guestctl1(s_guestctl1);
}
void dump_tlb_all(void )
{
dump_tlb(0 , current_cpu_data.tlbsize - 1 );
}
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