linux-kernel - [PATCH 3/3] MIPS: kernel: proc: add CPU option reporting

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Date:   Sat, 24 Apr 2021 13:51:27 -0700
From:   Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Jiri Kosina <trivial@...nel.org>,
        Ilya Lipnitskiy <ilya.lipnitskiy@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Hauke Mehrtens <hauke@...ke-m.de>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] MIPS: kernel: proc: add CPU option reporting

From: Hauke Mehrtens <hauke@...ke-m.de>

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@...ke-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()")
- 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@...il.com>
---
 arch/mips/kernel/proc.c | 110 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)

diff --git a/arch/mips/kernel/proc.c b/arch/mips/kernel/proc.c
index 7d8481d9acc3..68ad09cc6516 100644
--- a/arch/mips/kernel/proc.c
+++ b/arch/mips/kernel/proc.c
@@ -157,6 +157,116 @@ static int show_cpuinfo(struct seq_file *m, void *v)
 		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_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");
+	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",
-- 
2.31.1