diff mbox series

[v2,03/24] eal/loongarch: add cpu cycle operations for LoongArch

Message ID 20220531100245.542300-4-zhoumin@loongson.cn (mailing list archive)
State Superseded, archived
Delegated to: David Marchand
Headers
Series Support LoongArch architecture |

Checks

Context Check Description
ci/checkpatch success coding style OK

Commit Message

Min Zhou May 31, 2022, 10:02 a.m. UTC 
This patch adds architecture specific cpu cycle operations for
LoongArch. The RDTIME.D instruction is used to read constant
frequency timer information including counter value. The CPUCFG
instruction is used to dynamically identify which features of
LoongArch are implemented in the running processor during the
execution of the software. We can use this instruction to calculate
the frequency used by the timer.

Signed-off-by: Min Zhou <zhoumin@loongson.cn>
---
 lib/eal/loongarch/include/rte_cycles.h | 53 ++++++++++++++++++++++++++
 lib/eal/loongarch/rte_cycles.c         | 45 ++++++++++++++++++++++
 2 files changed, 98 insertions(+)
 create mode 100644 lib/eal/loongarch/include/rte_cycles.h
 create mode 100644 lib/eal/loongarch/rte_cycles.c
diff mbox series

Patch

diff --git a/lib/eal/loongarch/include/rte_cycles.h b/lib/eal/loongarch/include/rte_cycles.h
new file mode 100644
index 0000000000..1f8f957faf
--- /dev/null
+++ b/lib/eal/loongarch/include/rte_cycles.h
@@ -0,0 +1,53 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Loongson Technology Corporation Limited
+ */
+
+#ifndef _RTE_CYCLES_LOONGARCH_H_
+#define _RTE_CYCLES_LOONGARCH_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "generic/rte_cycles.h"
+
+static inline uint64_t
+get_cycle_count(void)
+{
+	uint64_t count;
+
+	__asm__ __volatile__ (
+		"rdtime.d %[cycles], $zero\n"
+		: [cycles] "=r" (count)
+		::
+		);
+	return count;
+}
+
+/**
+ * Read the time base register.
+ *
+ * @return
+ *   The time base for this lcore.
+ */
+static inline uint64_t
+rte_rdtsc(void)
+{
+	return get_cycle_count();
+}
+
+static inline uint64_t
+rte_rdtsc_precise(void)
+{
+	rte_mb();
+	return rte_rdtsc();
+}
+
+static inline uint64_t
+rte_get_tsc_cycles(void) { return rte_rdtsc(); }
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_CYCLES_LOONGARCH_H_ */
diff --git a/lib/eal/loongarch/rte_cycles.c b/lib/eal/loongarch/rte_cycles.c
new file mode 100644
index 0000000000..582601d335
--- /dev/null
+++ b/lib/eal/loongarch/rte_cycles.c
@@ -0,0 +1,45 @@ 
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 Loongson Technology Corporation Limited
+ */
+
+#include "eal_private.h"
+
+#define LOONGARCH_CPUCFG4	0x4
+#define CPUCFG4_CCFREQ_MASK	0xFFFFFFFF
+#define CPUCFG4_CCFREQ_SHIFT	0
+
+#define LOONGARCH_CPUCFG5	0x5
+#define CPUCFG5_CCMUL_MASK	0xFFFF
+#define CPUCFG5_CCMUL_SHIFT	0
+
+#define CPUCFG5_CCDIV_MASK	0xFFFF0000
+#define CPUCFG5_CCDIV_SHIFT	16
+
+static __rte_noinline uint32_t
+read_cpucfg(int arg)
+{
+	int ret = 0;
+
+	__asm__ __volatile__ (
+		"cpucfg %[var], %[index]\n"
+		: [var]"=r"(ret)
+		: [index]"r"(arg)
+		:
+		);
+
+	return ret;
+}
+
+uint64_t
+get_tsc_freq_arch(void)
+{
+	uint32_t base_freq, mul_factor, div_factor;
+
+	base_freq = read_cpucfg(LOONGARCH_CPUCFG4);
+	mul_factor = (read_cpucfg(LOONGARCH_CPUCFG5) & CPUCFG5_CCMUL_MASK) >>
+		CPUCFG5_CCMUL_SHIFT;
+	div_factor = (read_cpucfg(LOONGARCH_CPUCFG5) & CPUCFG5_CCDIV_MASK) >>
+		CPUCFG5_CCDIV_SHIFT;
+
+	return base_freq * mul_factor / div_factor;
+}