prefetchi: add 1 BAT case

Signed-off-by: Jiaan Lu <[email protected]>

BM/README.md

@@ -13,6 +13,7 @@
   * [IFS(In Field Scan)](ifs/README.md)
   * [ISST](isst/README.md)
   * [PMU](pmu/README.md)
+  * [PREFETCHI(Code SW Prefetch)](prefetchi/README.md)
   * [pstate](pstate/README.md)
   * [Intel_PT](pt/README.md)
   * [RAPL](rapl/README.md)

BM/prefetchi/Makefile

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# Copyright (c) 2024 Intel Corporation.
+
+CC = gcc
+CFLAGS = -g -Wall 
+TARGET = prefetchi
+
+$(TARGET): prefetchi.c
+	$(CC) $(CFLAGS) -o $@ $<
+
+clean:
+	rm -f $(TARGET)

BM/prefetchi/README.md

@@ -0,0 +1,13 @@
+# PREFETCHI (Code SW Prefetch)
+
+## Description
+PREFETCHI is a new set of instructions in the latest Intel platform Granite Rapids. This new instruction set moves code to memory (cache) closer to the processor depending on specific hints. The encodings stay NOPs in processors that do not enumerate these instructions.
+
+This is a basic test to ensure PREFETCHIT0/1 is supported on your platform.
+
+## Usage
+```
+make
+./prefetchi
+```
+Test result will be printed out.

BM/prefetchi/prefetchi.c

@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2024 Intel Corporation.
+
+#include <stdio.h>
+#include <stdint.h>
+#include "../common/kselftest.h"
+
+#define CPUID_LEAF7_EDX_PREFETCHI_MASK	(1 << 14) /* PREFETCHI instructions */
+
+static void check_cpuid_prefetchi(void)
+{
+	uint32_t eax, ebx, ecx, edx;
+
+	/*
+	 * CPUID.(EAX=07H, ECX=01H).EDX.PREFETCHI[bit 14] enumerates 
+	 * support for PREFETCHIT0/1 instructions.
+	 */
+	__cpuid_count(7, 1, eax, ebx, ecx, edx);
+	if (!(edx & CPUID_LEAF7_EDX_PREFETCHI_MASK))
+		printf("cpuid: CPU doesn't support PREFETCHIT0/1.\n");
+	else
+		printf("Test passed\n");
+}
+
+int main(void)
+{
+	check_cpuid_prefetchi();
+	return 0;
+}

README.md

@@ -21,6 +21,7 @@ More details please refer to following.
   * [IFS(In Field Scan)](BM/ifs/README.md)
   * [ISST](BM/isst/README.md)
   * [PMU](BM/pmu/README.md)
+  * [PREFETCHI(Code SW Prefetch)](BM/prefetchi/README.md)
   * [pstate](BM/pstate/README.md)
   * [Intel_PT](BM/pt/README.md)
   * [RAPL](BM/rapl/README.md)