arch/x86: Helper functions to get deterministic cache parameters

This patch creates helper function that internally detects the CPU
type (AMD or Intel) and pick the leaf to send CPUID instruction with
different cache level to retrieve deterministic cache parameters.

Lists of helper functions generated as part of this CL :
1. cpu_check_deterministic_cache_cpuid_supported => if CPU has support
for deterministic cache using CPUID instruction.
2. cpu_get_cache_ways_assoc_info => Get cache ways for associativity.
3. cpu_get_cache_type => Get cache type.
4. cpu_get_cache_level => Get cache level.
5. cpu_get_cache_phy_partition_info => Get cache physical partitions.
6. cpu_get_cache_line_size => Get cache line size.
7. cpu_get_cache_sets => Get cache number of sets.
8. cpu_is_cache_full_assoc => Check if cache is fully associative.
9. cpu_get_max_cache_share => Cores are sharing this cache.
10. get_cache_size => Calculate the cache size.
11. fill_cpu_cache_info => Fill cpu_cache_info structure.

Change-Id: I0dd701fb47460092448b64c7fa2162f762bf3095
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55965
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>

1 files changed, 132 insertions, 0 deletions

diff --git a/src/arch/x86/cpu_common.c b/src/arch/x86/cpu_common.c
index 77d08c4196..835cddd686 100644
--- a/src/arch/x86/cpu_common.c
+++ b/src/arch/x86/cpu_common.c
@@ -82,3 +82,135 @@ uint32_t cpu_get_feature_flags_edx(void)
 {
 	return cpuid_edx(1);
 }
+
+enum cpu_type cpu_check_deterministic_cache_cpuid_supported(void)
+{
+	struct cpuid_result res;
+
+	if (cpu_is_intel()) {
+		res = cpuid(0);
+		if (res.eax < 4)
+			return CPUID_COMMAND_UNSUPPORTED;
+		return CPUID_TYPE_INTEL;
+	} else if (cpu_is_amd()) {
+		res = cpuid(0x80000000);
+		if (res.eax < 0x80000001)
+			return CPUID_COMMAND_UNSUPPORTED;
+
+		res = cpuid(0x80000001);
+		if (!(res.ecx & (1 << 22)))
+			return CPUID_COMMAND_UNSUPPORTED;
+
+		return CPUID_TYPE_AMD;
+	} else {
+		return CPUID_TYPE_INVALID;
+	}
+}
+
+static uint32_t cpu_get_cache_info_leaf(void)
+{
+	switch (cpu_check_deterministic_cache_cpuid_supported()) {
+	case CPUID_TYPE_AMD:
+		return DETERMINISTIC_CACHE_PARAMETERS_CPUID_AMD;
+	case CPUID_TYPE_INTEL:
+		return DETERMINISTIC_CACHE_PARAMETERS_CPUID_IA;
+	default:
+		return 0;
+	}
+}
+
+size_t cpu_get_cache_ways_assoc_info(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return 0;
+
+	return info->num_ways;
+}
+
+uint8_t cpu_get_cache_type(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return 0;
+
+	return info->type;
+}
+
+uint8_t cpu_get_cache_level(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return 0;
+
+	return info->level;
+}
+
+size_t cpu_get_cache_phy_partition_info(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return 0;
+
+	return info->physical_partitions;
+}
+
+size_t cpu_get_cache_line_size(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return 0;
+
+	return info->line_size;
+}
+
+size_t cpu_get_cache_sets(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return 0;
+
+	return info->num_sets;
+}
+
+bool cpu_is_cache_full_assoc(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return false;
+
+	return info->fully_associative;
+}
+
+size_t cpu_get_max_cache_share(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return 0;
+
+	return info->num_cores_shared;
+}
+
+size_t get_cache_size(const struct cpu_cache_info *info)
+{
+	if (!info)
+		return 0;
+
+	return info->num_ways * info->physical_partitions * info->line_size * info->num_sets;
+}
+
+bool fill_cpu_cache_info(uint8_t level, struct cpu_cache_info *info)
+{
+	if (!info)
+		return false;
+
+	uint32_t leaf = cpu_get_cache_info_leaf();
+	if (!leaf)
+		return false;
+
+	struct cpuid_result cache_info_res = cpuid_ext(leaf, level);
+
+	info->type = CPUID_CACHE_TYPE(cache_info_res);
+	info->level = CPUID_CACHE_LEVEL(cache_info_res);
+	info->num_ways = CPUID_CACHE_WAYS_OF_ASSOC(cache_info_res) + 1;
+	info->num_sets = CPUID_CACHE_NO_OF_SETS(cache_info_res) + 1;
+	info->line_size = CPUID_CACHE_COHER_LINE(cache_info_res) + 1;
+	info->physical_partitions = CPUID_CACHE_PHYS_LINE(cache_info_res) + 1;
+	info->num_cores_shared = CPUID_CACHE_SHARING_CACHE(cache_info_res) + 1;
+	info->fully_associative = CPUID_CACHE_FULL_ASSOC(cache_info_res);
+	info->size = get_cache_size(info);
+
+	return true;
+}