[RFC PATCH v3 33/37] kvx: Add support for cpuinfo

ysionneau
2024-07-22T09:43:53Z

From: Yann Sionneau <ysionneau@kalrayinc.com>

Add support for cpuinfo on kvx arch.

Co-developed-by: Clement Leger <clement@clement-leger.fr>
Signed-off-by: Clement Leger <clement@clement-leger.fr>
Co-developed-by: Guillaume Thouvenin <thouveng@gmail.com>
Signed-off-by: Guillaume Thouvenin <thouveng@gmail.com>
Co-developed-by: Julian Vetter <jvetter@kalrayinc.com>
Signed-off-by: Julian Vetter <jvetter@kalrayinc.com>
Signed-off-by: Jules Maselbas <jmaselbas@zdiv.net>
Signed-off-by: Yann Sionneau <ysionneau@kalrayinc.com>
---

Notes:
V1 -> V2: No changes
V2 -> V3:
- add missing function declaration for setup_cpuinfo()
- replace printk(KERN_WARNING... with pr_warn(...
---
arch/kvx/include/asm/cpuinfo.h | 7 +++
arch/kvx/kernel/cpuinfo.c | 95 ++++++++++++++++++++++++++++++++++
2 files changed, 102 insertions(+)
create mode 100644 arch/kvx/include/asm/cpuinfo.h
create mode 100644 arch/kvx/kernel/cpuinfo.c

diff --git a/arch/kvx/include/asm/cpuinfo.h b/arch/kvx/include/asm/cpuinfo.h
new file mode 100644
index 0000000000000..ace9b85fbafaf
--- /dev/null
+++ b/arch/kvx/include/asm/cpuinfo.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#ifndef __ASM_KVX_CPUINFO_H
+#define __ASM_KVX_CPUINFO_H
+
+extern void setup_cpuinfo(void);
+
+#endif /* __ASM_KVX_CPUINFO_H */
diff --git a/arch/kvx/kernel/cpuinfo.c b/arch/kvx/kernel/cpuinfo.c
new file mode 100644
index 0000000000000..6d46fd2a1bd93
--- /dev/null
+++ b/arch/kvx/kernel/cpuinfo.c
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2017-2023 Kalray Inc.
+ * Author(s): Clement Leger
+ * Guillaume Thouvenin
+ */
+
+#include <linux/seq_file.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/cpu.h>
+#include <linux/of.h>
+
+unsigned long elf_hwcap __read_mostly;
+
+static int show_cpuinfo(struct seq_file *m, void *v)
+{
+ int cpu_num = *(unsigned int *)v;
+ struct cpuinfo_kvx *n = per_cpu_ptr(&cpu_info, cpu_num);
+
+ seq_printf(m, "processor\t: %d\nvendor_id\t: Kalray\n", cpu_num);
+
+ seq_printf(m,
+ "copro enabled\t: %s\n"
+ "arch revision\t: %d\n"
+ "uarch revision\t: %d\n",
+ n->copro_enable ? "yes" : "no",
+ n->arch_rev,
+ n->uarch_rev);
+
+ seq_printf(m,
+ "bogomips\t: %lu.%02lu\n"
+ "cpu MHz\t\t: %llu.%03llu\n\n",
+ (loops_per_jiffy * HZ) / 500000,
+ ((loops_per_jiffy * HZ) / 5000) % 100,
+ n->freq / 1000000, (n->freq / 10000) % 100);
+
+ return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ if (*pos == 0)
+ *pos = cpumask_first(cpu_online_mask);
+ if (*pos >= num_online_cpus())
+ return NULL;
+
+ return pos;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ *pos = cpumask_next(*pos, cpu_online_mask);
+
+ return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+const struct seq_operations cpuinfo_op = {
+ .start = c_start,
+ .next = c_next,
+ .stop = c_stop,
+ .show = show_cpuinfo,
+};
+
+static int __init setup_cpuinfo(void)
+{
+ int cpu;
+ struct clk *clk;
+ unsigned long cpu_freq = 1000000000;
+ struct device_node *node = of_get_cpu_node(0, NULL);
+
+ clk = of_clk_get(node, 0);
+ if (IS_ERR(clk)) {
+ pr_warn("Device tree missing CPU 'clock' parameter. Assuming frequency is 1GHZ");
+ goto setup_cpu_freq;
+ }
+
+ cpu_freq = clk_get_rate(clk);
+
+ clk_put(clk);
+
+setup_cpu_freq:
+ of_node_put(node);
+
+ for_each_possible_cpu(cpu)
+ per_cpu_ptr(&cpu_info, cpu)->freq = cpu_freq;
+
+ return 0;
+}
+
+late_initcall(setup_cpuinfo);
--
2.45.2