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Message-ID: <20250109063056.2438304-1-chenhuacai@loongson.cn>
Date: Thu, 9 Jan 2025 14:30:56 +0800
From: Huacai Chen <chenhuacai@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
Xuefeng Li <lixuefeng@...ngson.cn>,
Guo Ren <guoren@...nel.org>,
Xuerui Wang <kernel@...0n.name>,
Jiaxun Yang <jiaxun.yang@...goat.com>,
linux-kernel@...r.kernel.org,
loongson-kernel@...ts.loongnix.cn,
Huacai Chen <chenhuacai@...ngson.cn>
Subject: [PATCH] LoongArch: Add debugfs entries to switch SFB/TSO state
We need to switch SFB (Store Fill Buffer) and TSO (Total Store Order)
state at runtime to debug memory management and KVM virtualization, so
add two debugfs entries "sfb_state" and "tso_state" under the directory
/sys/kernel/debug/loongarch.
Query SFB:
cat /sys/kernel/debug/loongarch/sfb_state
Enable SFB:
echo 1 > /sys/kernel/debug/loongarch/sfb_state
Disable SFB:
echo 0 > /sys/kernel/debug/loongarch/sfb_state
Query TSO:
cat /sys/kernel/debug/loongarch/tso_state
Switch TSO:
echo [TSO] > /sys/kernel/debug/loongarch/tso_state
Available [TSO] states:
0 (No Load No Store) 1 (All Load No Store) 3 (Same Load No Store)
4 (No Load All Store) 5 (All Load All Store) 7 (Same Load All Store)
Signed-off-by: Huacai Chen <chenhuacai@...ngson.cn>
---
arch/loongarch/include/asm/loongarch.h | 15 +++
arch/loongarch/kernel/Makefile | 2 +-
arch/loongarch/kernel/kdebugfs.c | 168 +++++++++++++++++++++++++
arch/loongarch/kernel/unaligned.c | 8 +-
4 files changed, 186 insertions(+), 7 deletions(-)
create mode 100644 arch/loongarch/kernel/kdebugfs.c
diff --git a/arch/loongarch/include/asm/loongarch.h b/arch/loongarch/include/asm/loongarch.h
index a3cc4f8d4c4a..15c245636176 100644
--- a/arch/loongarch/include/asm/loongarch.h
+++ b/arch/loongarch/include/asm/loongarch.h
@@ -108,6 +108,12 @@
#define CPUCFG3_SPW_HG_HF BIT(11)
#define CPUCFG3_RVA BIT(12)
#define CPUCFG3_RVAMAX GENMASK(16, 13)
+#define CPUCFG3_ALDORDER_CAP BIT(18) /* All address load ordered, capability */
+#define CPUCFG3_ASTORDER_CAP BIT(19) /* All address store ordered, capability */
+#define CPUCFG3_ALDORDER_STA BIT(20) /* All address load ordered, status */
+#define CPUCFG3_ASTORDER_STA BIT(21) /* All address store ordered, status */
+#define CPUCFG3_SLDORDER_CAP BIT(22) /* Same address load ordered, capability */
+#define CPUCFG3_SLDORDER_STA BIT(23) /* Same address load ordered, status */
#define LOONGARCH_CPUCFG4 0x4
#define CPUCFG4_CCFREQ GENMASK(31, 0)
@@ -565,6 +571,15 @@
/* Implement dependent */
#define LOONGARCH_CSR_IMPCTL1 0x80 /* Loongson config1 */
+#define CSR_LDSTORDER_SHIFT 28
+#define CSR_LDSTORDER_WIDTH 3
+#define CSR_LDSTORDER_MASK (_ULCAST_(0x7) << CSR_LDSTORDER_SHIFT)
+#define CSR_LDSTORDER_NLD_NST (_ULCAST_(0x0) << CSR_LDSTORDER_SHIFT) /* 000 = No Load No Store */
+#define CSR_LDSTORDER_ALD_NST (_ULCAST_(0x1) << CSR_LDSTORDER_SHIFT) /* 001 = All Load No Store */
+#define CSR_LDSTORDER_SLD_NST (_ULCAST_(0x3) << CSR_LDSTORDER_SHIFT) /* 011 = Same Load No Store */
+#define CSR_LDSTORDER_NLD_AST (_ULCAST_(0x4) << CSR_LDSTORDER_SHIFT) /* 100 = No Load All Store */
+#define CSR_LDSTORDER_ALD_AST (_ULCAST_(0x5) << CSR_LDSTORDER_SHIFT) /* 101 = All Load All Store */
+#define CSR_LDSTORDER_SLD_AST (_ULCAST_(0x7) << CSR_LDSTORDER_SHIFT) /* 111 = Same Load All Store */
#define CSR_MISPEC_SHIFT 20
#define CSR_MISPEC_WIDTH 8
#define CSR_MISPEC (_ULCAST_(0xff) << CSR_MISPEC_SHIFT)
diff --git a/arch/loongarch/kernel/Makefile b/arch/loongarch/kernel/Makefile
index 9497968ee158..4853e8b04c6f 100644
--- a/arch/loongarch/kernel/Makefile
+++ b/arch/loongarch/kernel/Makefile
@@ -10,7 +10,7 @@ extra-y := vmlinux.lds
obj-y += head.o cpu-probe.o cacheinfo.o env.o setup.o entry.o genex.o \
traps.o irq.o idle.o process.o dma.o mem.o reset.o switch.o \
elf.o syscall.o signal.o time.o topology.o inst.o ptrace.o vdso.o \
- alternative.o unwind.o
+ alternative.o kdebugfs.o unwind.o
obj-$(CONFIG_ACPI) += acpi.o
obj-$(CONFIG_EFI) += efi.o
diff --git a/arch/loongarch/kernel/kdebugfs.c b/arch/loongarch/kernel/kdebugfs.c
new file mode 100644
index 000000000000..cf1d89888e32
--- /dev/null
+++ b/arch/loongarch/kernel/kdebugfs.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/debugfs.h>
+#include <linux/kstrtox.h>
+#include <asm/loongarch.h>
+
+struct dentry *arch_debugfs_dir;
+EXPORT_SYMBOL(arch_debugfs_dir);
+
+static int sfb_state, tso_state;
+
+static void set_sfb_state(void *info)
+{
+ int val = *(int *)info << CSR_STFILL_SHIFT;
+
+ csr_xchg32(val, CSR_STFILL, LOONGARCH_CSR_IMPCTL1);
+}
+
+static ssize_t sfb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+ int s, state;
+ char str[32];
+
+ state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_STFILL) >> CSR_STFILL_SHIFT;
+
+ s = snprintf(str, sizeof(str), "Boot State: %x\nCurrent State: %x\n", sfb_state, state);
+
+ if (*ppos >= s)
+ return 0;
+
+ s -= *ppos;
+ s = min_t(u32, s, count);
+
+ if (copy_to_user(buf, &str[*ppos], s))
+ return -EFAULT;
+
+ *ppos += s;
+
+ return s;
+}
+
+static ssize_t sfb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+ int state;
+
+ if (kstrtoint_from_user(buf, count, 10, &state))
+ return -EFAULT;
+
+ switch (state) {
+ case 0: case 1:
+ on_each_cpu(set_sfb_state, &state, 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+static const struct file_operations sfb_fops = {
+ .read = sfb_read,
+ .write = sfb_write,
+ .open = simple_open,
+ .llseek = default_llseek
+};
+
+#define LDSTORDER_NLD_NST 0x0 /* 000 = No Load No Store */
+#define LDSTORDER_ALD_NST 0x1 /* 001 = All Load No Store */
+#define LDSTORDER_SLD_NST 0x3 /* 011 = Same Load No Store */
+#define LDSTORDER_NLD_AST 0x4 /* 100 = No Load All Store */
+#define LDSTORDER_ALD_AST 0x5 /* 101 = All Load All Store */
+#define LDSTORDER_SLD_AST 0x7 /* 111 = Same Load All Store */
+
+static char *tso_hints[] = {
+ "No Load No Store",
+ "All Load No Store",
+ "Invalid Config",
+ "Same Load No Store",
+ "No Load All Store",
+ "All Load All Store",
+ "Invalid Config",
+ "Same Load All Store"
+};
+
+static void set_tso_state(void *info)
+{
+ int val = *(int *)info << CSR_LDSTORDER_SHIFT;
+
+ csr_xchg32(val, CSR_LDSTORDER_MASK, LOONGARCH_CSR_IMPCTL1);
+}
+
+static ssize_t tso_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
+{
+ int s, state;
+ char str[240];
+
+ state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_LDSTORDER_MASK) >> CSR_LDSTORDER_SHIFT;
+
+ s = snprintf(str, sizeof(str), "Boot State: %d (%s)\n"
+ "Current State: %d (%s)\n\n"
+ "Available States:\n"
+ "0 (%s)\t" "1 (%s)\t" "3 (%s)\n"
+ "4 (%s)\t" "5 (%s)\t" "7 (%s)\n",
+ tso_state, tso_hints[tso_state], state, tso_hints[state],
+ tso_hints[0], tso_hints[1], tso_hints[3], tso_hints[4], tso_hints[5], tso_hints[7]);
+
+ if (*ppos >= s)
+ return 0;
+
+ s -= *ppos;
+ s = min_t(u32, s, count);
+
+ if (copy_to_user(buf, &str[*ppos], s))
+ return -EFAULT;
+
+ *ppos += s;
+
+ return s;
+}
+
+static ssize_t tso_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
+{
+ int state;
+
+ if (kstrtoint_from_user(buf, count, 10, &state))
+ return -EFAULT;
+
+ switch (state) {
+ case 0: case 1: case 3:
+ case 4: case 5: case 7:
+ on_each_cpu(set_tso_state, &state, 1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return count;
+}
+
+static const struct file_operations tso_fops = {
+ .read = tso_read,
+ .write = tso_write,
+ .open = simple_open,
+ .llseek = default_llseek
+};
+
+static int __init arch_kdebugfs_init(void)
+{
+ unsigned int config = read_cpucfg(LOONGARCH_CPUCFG3);
+
+ arch_debugfs_dir = debugfs_create_dir("loongarch", NULL);
+
+ if (config & CPUCFG3_SFB) {
+ debugfs_create_file("sfb_state", S_IRUGO | S_IWUGO,
+ arch_debugfs_dir, &sfb_state, &sfb_fops);
+ sfb_state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_STFILL) >> CSR_STFILL_SHIFT;
+ }
+
+ if (config & (CPUCFG3_ALDORDER_CAP | CPUCFG3_ASTORDER_CAP)) {
+ debugfs_create_file("tso_state", S_IRUGO | S_IWUGO,
+ arch_debugfs_dir, &tso_state, &tso_fops);
+ tso_state = (csr_read32(LOONGARCH_CSR_IMPCTL1) & CSR_LDSTORDER_MASK) >> CSR_LDSTORDER_SHIFT;
+ }
+
+ return 0;
+}
+postcore_initcall(arch_kdebugfs_init);
diff --git a/arch/loongarch/kernel/unaligned.c b/arch/loongarch/kernel/unaligned.c
index 3abf163dda05..487be604b96a 100644
--- a/arch/loongarch/kernel/unaligned.c
+++ b/arch/loongarch/kernel/unaligned.c
@@ -482,14 +482,10 @@ void emulate_load_store_insn(struct pt_regs *regs, void __user *addr, unsigned i
#ifdef CONFIG_DEBUG_FS
static int __init debugfs_unaligned(void)
{
- struct dentry *d;
-
- d = debugfs_create_dir("loongarch", NULL);
-
debugfs_create_u32("unaligned_instructions_user",
- S_IRUGO, d, &unaligned_instructions_user);
+ S_IRUGO, arch_debugfs_dir, &unaligned_instructions_user);
debugfs_create_u32("unaligned_instructions_kernel",
- S_IRUGO, d, &unaligned_instructions_kernel);
+ S_IRUGO, arch_debugfs_dir, &unaligned_instructions_kernel);
return 0;
}
--
2.43.5
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