diff options
Diffstat (limited to 'arch/mips/lib/dump_tlb.c')
| -rw-r--r-- | arch/mips/lib/dump_tlb.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/arch/mips/lib/dump_tlb.c b/arch/mips/lib/dump_tlb.c new file mode 100644 index 000000000..425642363 --- /dev/null +++ b/arch/mips/lib/dump_tlb.c @@ -0,0 +1,199 @@ +// 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 +#ifndef CONFIG_CPU_VR41XX + case PM_1M: return "1Mb"; + case PM_4M: return "4Mb"; + case PM_16M: return "16Mb"; + case PM_64M: return "64Mb"; + case PM_256M: return "256Mb"; + case PM_1G: return "1Gb"; +#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 & ~0x1ffffUL) == 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 & ~0x1fffUL), + 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); +} |