openwrt/target/linux/generic/backport-5.15/330-v5.16-01-MIPS-kernel-proc-add-CPU-option-reporting.patch

From 626bfa03729959ea9917181fb3d8ffaa1594d02a Mon Sep 17 00:00:00 2001
From: Hauke Mehrtens <hauke@hauke-m.de>
Date: Wed, 13 Oct 2021 22:40:18 -0700
Subject: [PATCH 1/1] MIPS: kernel: proc: add CPU option reporting

Many MIPS CPUs have optional CPU features which are not activated for
all CPU cores. Print the CPU options, which are implemented in the core,
in /proc/cpuinfo. This makes it possible to see which features are
supported and which are not supported. This should cover all standard
MIPS extensions. Before, it only printed information about the main MIPS
ASEs.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

Changes from original patch[0]:
- Remove cpu_has_6k_cache and cpu_has_8k_cache due to commit 6ce91ba8589a
  ("MIPS: Remove cpu_has_6k_cache and cpu_has_8k_cache in cpu_cache_init()")
- Add new options: mac2008_only, ftlbparex, gsexcex, mmid, mm_sysad,
  mm_full
- Use seq_puts instead of seq_printf as suggested by checkpatch
- Minor commit message reword

[0]: https://lore.kernel.org/linux-mips/20181223225224.23042-1-hauke@hauke-m.de/

Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
---
 arch/mips/kernel/proc.c | 122 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 122 insertions(+)

--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -138,6 +138,128 @@ static int show_cpuinfo(struct seq_file
 		seq_printf(m, "micromips kernel\t: %s\n",
 		      (read_c0_config3() & MIPS_CONF3_ISA_OE) ?  "yes" : "no");
 	}
+
+	seq_puts(m, "Options implemented\t:");
+	if (cpu_has_tlb)
+		seq_puts(m, " tlb");
+	if (cpu_has_ftlb)
+		seq_puts(m, " ftlb");
+	if (cpu_has_tlbinv)
+		seq_puts(m, " tlbinv");
+	if (cpu_has_segments)
+		seq_puts(m, " segments");
+	if (cpu_has_rixiex)
+		seq_puts(m, " rixiex");
+	if (cpu_has_ldpte)
+		seq_puts(m, " ldpte");
+	if (cpu_has_maar)
+		seq_puts(m, " maar");
+	if (cpu_has_rw_llb)
+		seq_puts(m, " rw_llb");
+	if (cpu_has_4kex)
+		seq_puts(m, " 4kex");
+	if (cpu_has_3k_cache)
+		seq_puts(m, " 3k_cache");
+	if (cpu_has_4k_cache)
+		seq_puts(m, " 4k_cache");
+	if (cpu_has_tx39_cache)
+		seq_puts(m, " tx39_cache");
+	if (cpu_has_octeon_cache)
+		seq_puts(m, " octeon_cache");
+	if (cpu_has_fpu)
+		seq_puts(m, " fpu");
+	if (cpu_has_32fpr)
+		seq_puts(m, " 32fpr");
+	if (cpu_has_cache_cdex_p)
+		seq_puts(m, " cache_cdex_p");
+	if (cpu_has_cache_cdex_s)
+		seq_puts(m, " cache_cdex_s");
+	if (cpu_has_prefetch)
+		seq_puts(m, " prefetch");
+	if (cpu_has_mcheck)
+		seq_puts(m, " mcheck");
+	if (cpu_has_ejtag)
+		seq_puts(m, " ejtag");
+	if (cpu_has_llsc)
+		seq_puts(m, " llsc");
+	if (cpu_has_guestctl0ext)
+		seq_puts(m, " guestctl0ext");
+	if (cpu_has_guestctl1)
+		seq_puts(m, " guestctl1");
+	if (cpu_has_guestctl2)
+		seq_puts(m, " guestctl2");
+	if (cpu_has_guestid)
+		seq_puts(m, " guestid");
+	if (cpu_has_drg)
+		seq_puts(m, " drg");
+	if (cpu_has_rixi)
+		seq_puts(m, " rixi");
+	if (cpu_has_lpa)
+		seq_puts(m, " lpa");
+	if (cpu_has_mvh)
+		seq_puts(m, " mvh");
+	if (cpu_has_vtag_icache)
+		seq_puts(m, " vtag_icache");
+	if (cpu_has_dc_aliases)
+		seq_puts(m, " dc_aliases");
+	if (cpu_has_ic_fills_f_dc)
+		seq_puts(m, " ic_fills_f_dc");
+	if (cpu_has_pindexed_dcache)
+		seq_puts(m, " pindexed_dcache");
+	if (cpu_has_userlocal)
+		seq_puts(m, " userlocal");
+	if (cpu_has_nofpuex)
+		seq_puts(m, " nofpuex");
+	if (cpu_has_vint)
+		seq_puts(m, " vint");
+	if (cpu_has_veic)
+		seq_puts(m, " veic");
+	if (cpu_has_inclusive_pcaches)
+		seq_puts(m, " inclusive_pcaches");
+	if (cpu_has_perf_cntr_intr_bit)
+		seq_puts(m, " perf_cntr_intr_bit");
+	if (cpu_has_ufr)
+		seq_puts(m, " ufr");
+	if (cpu_has_fre)
+		seq_puts(m, " fre");
+	if (cpu_has_cdmm)
+		seq_puts(m, " cdmm");
+	if (cpu_has_small_pages)
+		seq_puts(m, " small_pages");
+	if (cpu_has_nan_legacy)
+		seq_puts(m, " nan_legacy");
+	if (cpu_has_nan_2008)
+		seq_puts(m, " nan_2008");
+	if (cpu_has_ebase_wg)
+		seq_puts(m, " ebase_wg");
+	if (cpu_has_badinstr)
+		seq_puts(m, " badinstr");
+	if (cpu_has_badinstrp)
+		seq_puts(m, " badinstrp");
+	if (cpu_has_contextconfig)
+		seq_puts(m, " contextconfig");
+	if (cpu_has_perf)
+		seq_puts(m, " perf");
+	if (cpu_has_mac2008_only)
+		seq_puts(m, " mac2008_only");
+	if (cpu_has_ftlbparex)
+		seq_puts(m, " ftlbparex");
+	if (cpu_has_gsexcex)
+		seq_puts(m, " gsexcex");
+	if (cpu_has_shared_ftlb_ram)
+		seq_puts(m, " shared_ftlb_ram");
+	if (cpu_has_shared_ftlb_entries)
+		seq_puts(m, " shared_ftlb_entries");
+	if (cpu_has_mipsmt_pertccounters)
+		seq_puts(m, " mipsmt_pertccounters");
+	if (cpu_has_mmid)
+		seq_puts(m, " mmid");
+	if (cpu_has_mm_sysad)
+		seq_puts(m, " mm_sysad");
+	if (cpu_has_mm_full)
+		seq_puts(m, " mm_full");
+	seq_puts(m, "\n");
+
 	seq_printf(m, "shadow register sets\t: %d\n",
 		      cpu_data[n].srsets);
 	seq_printf(m, "kscratch registers\t: %d\n",