From efada2afacee7b5e59b3182bc36ddfb0fad2b0e2 Mon Sep 17 00:00:00 2001
From: WANG Xuerui <git@xen0n.name>
Date: Mon, 1 May 2023 17:19:10 +0800
Subject: [PATCH] LoongArch: Humanize the CRMD line when showing registers
Example output looks like:
[ xx.xxxxxx] CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)
Some initial machinery for this pretty-printing format has been included
in this patch as well.
Signed-off-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
arch/loongarch/kernel/traps.c | 51 ++++++++++++++++++++++++++++++++++-
1 file changed, 50 insertions(+), 1 deletion(-)
diff --git a/arch/loongarch/kernel/traps.c b/arch/loongarch/kernel/traps.c
index 434a7717faceb..97af825477259 100644
--- a/arch/loongarch/kernel/traps.c
+++ b/arch/loongarch/kernel/traps.c
@@ -3,6 +3,7 @@
* Author: Huacai Chen <chenhuacai@loongson.cn>
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
+#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/compiler.h>
@@ -153,6 +154,54 @@ static void show_code(unsigned int *pc, bool user)
pr_cont("\n");
}
+static void print_bool_fragment(const char *key, unsigned long val, bool first)
+{
+ /* e.g. "+PG", "-DA" */
+ pr_cont("%s%c%s", first ? "" : " ", val ? '+' : '-', key);
+}
+
+static void print_plv_fragment(const char *key, int val)
+{
+ /* e.g. "PLV0", "PPLV3" */
+ pr_cont("%s%d", key, val);
+}
+
+static void print_memory_type_fragment(const char *key, unsigned long val)
+{
+ const char *humanized_type;
+
+ switch (val) {
+ case 0:
+ humanized_type = "SUC";
+ break;
+ case 1:
+ humanized_type = "CC";
+ break;
+ case 2:
+ humanized_type = "WUC";
+ break;
+ default:
+ pr_cont(" %s=Reserved(%lu)", key, val);
+ return;
+ }
+
+ /* e.g. " DATM=WUC" */
+ pr_cont(" %s=%s", key, humanized_type);
+}
+
+static void print_crmd(unsigned long x)
+{
+ printk(" CRMD: %08lx (", x);
+ print_plv_fragment("PLV", (int) FIELD_GET(CSR_CRMD_PLV, x));
+ print_bool_fragment("IE", FIELD_GET(CSR_CRMD_IE, x), false);
+ print_bool_fragment("DA", FIELD_GET(CSR_CRMD_DA, x), false);
+ print_bool_fragment("PG", FIELD_GET(CSR_CRMD_PG, x), false);
+ print_memory_type_fragment("DACF", FIELD_GET(CSR_CRMD_DACF, x));
+ print_memory_type_fragment("DACM", FIELD_GET(CSR_CRMD_DACM, x));
+ print_bool_fragment("WE", FIELD_GET(CSR_CRMD_WE, x), false);
+ pr_cont(")\n");
+}
+
static void __show_regs(const struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
@@ -194,7 +243,7 @@ static void __show_regs(const struct pt_regs *regs)
#undef GPR_FIELD
/* Print saved important CSRs */
- printk(" CRMD: %08lx\n", regs->csr_crmd);
+ print_crmd(regs->csr_crmd);
printk(" PRMD: %08lx\n", regs->csr_prmd);
printk(" EUEN: %08lx\n", regs->csr_euen);
printk(" ECFG: %08lx\n", regs->csr_ecfg);
--
2.30.2