diff options
Diffstat (limited to 'arch/loongarch/lib/dump_tlb.c')
| -rw-r--r-- | arch/loongarch/lib/dump_tlb.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/arch/loongarch/lib/dump_tlb.c b/arch/loongarch/lib/dump_tlb.c new file mode 100644 index 000000000000..cda2c6bc7f09 --- /dev/null +++ b/arch/loongarch/lib/dump_tlb.c @@ -0,0 +1,111 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2020-2022 Loongson Technology Corporation Limited + * + * Derived from MIPS: + * 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/loongarch.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/tlb.h> + +void dump_tlb_regs(void) +{ + const int field = 2 * sizeof(unsigned long); + + pr_info("Index : %0x\n", read_csr_tlbidx()); + pr_info("PageSize : %0x\n", read_csr_pagesize()); + pr_info("EntryHi : %0*llx\n", field, read_csr_entryhi()); + pr_info("EntryLo0 : %0*llx\n", field, read_csr_entrylo0()); + pr_info("EntryLo1 : %0*llx\n", field, read_csr_entrylo1()); +} + +static void dump_tlb(int first, int last) +{ + unsigned long s_entryhi, entryhi, asid; + unsigned long long entrylo0, entrylo1, pa; + unsigned int index; + unsigned int s_index, s_asid; + unsigned int pagesize, c0, c1, i; + unsigned long asidmask = cpu_asid_mask(¤t_cpu_data); + int pwidth = 11; + int vwidth = 11; + int asidwidth = DIV_ROUND_UP(ilog2(asidmask) + 1, 4); + + s_entryhi = read_csr_entryhi(); + s_index = read_csr_tlbidx(); + s_asid = read_csr_asid(); + + for (i = first; i <= last; i++) { + write_csr_index(i); + tlb_read(); + pagesize = read_csr_pagesize(); + entryhi = read_csr_entryhi(); + entrylo0 = read_csr_entrylo0(); + entrylo1 = read_csr_entrylo1(); + index = read_csr_tlbidx(); + asid = read_csr_asid(); + + /* EHINV bit marks entire entry as invalid */ + if (index & CSR_TLBIDX_EHINV) + continue; + /* + * ASID takes effect in absence of G (global) bit. + */ + if (!((entrylo0 | entrylo1) & ENTRYLO_G) && + asid != s_asid) + continue; + + /* + * Only print entries in use + */ + pr_info("Index: %2d pgsize=%x ", i, (1 << pagesize)); + + 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, asid & asidmask); + + /* NR/NX are in awkward places, so mask them off separately */ + pa = entrylo0 & ~(ENTRYLO_NR | ENTRYLO_NX); + pa = pa & PAGE_MASK; + pr_cont("\n\t["); + pr_cont("ri=%d xi=%d ", + (entrylo0 & ENTRYLO_NR) ? 1 : 0, + (entrylo0 & ENTRYLO_NX) ? 1 : 0); + pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d plv=%lld] [", + pwidth, pa, c0, + (entrylo0 & ENTRYLO_D) ? 1 : 0, + (entrylo0 & ENTRYLO_V) ? 1 : 0, + (entrylo0 & ENTRYLO_G) ? 1 : 0, + (entrylo0 & ENTRYLO_PLV) >> ENTRYLO_PLV_SHIFT); + /* NR/NX are in awkward places, so mask them off separately */ + pa = entrylo1 & ~(ENTRYLO_NR | ENTRYLO_NX); + pa = pa & PAGE_MASK; + pr_cont("ri=%d xi=%d ", + (entrylo1 & ENTRYLO_NR) ? 1 : 0, + (entrylo1 & ENTRYLO_NX) ? 1 : 0); + pr_cont("pa=%0*llx c=%d d=%d v=%d g=%d plv=%lld]\n", + pwidth, pa, c1, + (entrylo1 & ENTRYLO_D) ? 1 : 0, + (entrylo1 & ENTRYLO_V) ? 1 : 0, + (entrylo1 & ENTRYLO_G) ? 1 : 0, + (entrylo1 & ENTRYLO_PLV) >> ENTRYLO_PLV_SHIFT); + } + pr_info("\n"); + + write_csr_entryhi(s_entryhi); + write_csr_tlbidx(s_index); + write_csr_asid(s_asid); +} + +void dump_tlb_all(void) +{ + dump_tlb(0, current_cpu_data.tlbsize - 1); +} |