[PATCH 08/10] armv8: Add sysinfo driver for cache information
Raymond Mao
raymond.mao at linaro.org
Fri Aug 16 17:46:51 CEST 2024
Add cache information sysinfo driver containing necessary information
required by SMBIOS type 7 for all armv8 platforms.
Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
---
arch/arm/cpu/armv8/sysinfo.c | 188 +++++++++++++++++++++++++++++++++++
1 file changed, 188 insertions(+)
diff --git a/arch/arm/cpu/armv8/sysinfo.c b/arch/arm/cpu/armv8/sysinfo.c
index a8e17d654be..73e071212ae 100644
--- a/arch/arm/cpu/armv8/sysinfo.c
+++ b/arch/arm/cpu/armv8/sysinfo.c
@@ -13,6 +13,30 @@
#define ELEMENT_RECORD_DATA_LEN 8
#define ELEMENT_RECORD_NUM 2
+union ccsidr_el1 {
+ struct {
+ u64 linesize:3;
+ u64 associativity:10;
+ u64 numsets:15;
+ u64 unknown:4;
+ u64 reserved:32;
+ } no_ccidx;
+ struct {
+ u64 linesize:3;
+ u64 associativity:21;
+ u64 reserved1:8;
+ u64 numsets:24;
+ u64 reserved2:8;
+ } ccidx_aarch64;
+ struct {
+ u64 linesize:3;
+ u64 associativity:21;
+ u64 reserved:8;
+ u64 unallocated:32;
+ } ccidx_aarch32;
+ u64 data;
+};
+
union midr_el1 {
struct {
u64 revision:4;
@@ -25,6 +49,28 @@ union midr_el1 {
u64 data;
};
+enum {
+ CACHE_NONE,
+ CACHE_INST_ONLY,
+ CACHE_DATA_ONLY,
+ CACHE_INST_WITH_DATA,
+ CACHE_UNIFIED,
+};
+
+enum {
+ CACHE_ASSOC_DIRECT_MAPPED = 1,
+ CACHE_ASSOC_2WAY = 2,
+ CACHE_ASSOC_4WAY = 4,
+ CACHE_ASSOC_8WAY = 8,
+ CACHE_ASSOC_16WAY = 16,
+ CACHE_ASSOC_12WAY = 12,
+ CACHE_ASSOC_24WAY = 24,
+ CACHE_ASSOC_32WAY = 32,
+ CACHE_ASSOC_48WAY = 48,
+ CACHE_ASSOC_64WAY = 64,
+ CACHE_ASSOC_20WAY = 20,
+};
+
enum {
VENDOR_RESERVED = 0,
VENDOR_ARM = 0x41,
@@ -47,6 +93,7 @@ struct __packed enclosure_element_record {
u8 data[ELEMENT_RECORD_DATA_LEN];
};
+struct cache_info cache_info_armv8[SYSINFO_CACHE_LVL_MAX];
struct processor_info processor_info_armv8;
/* Default data for the enclosure contained elements */
@@ -65,6 +112,144 @@ struct enclosure_element_record contained_elements[ELEMENT_RECORD_NUM] = {
},
};
+/*
+ * TODO:
+ * To support ARMv8.3, we need to read "CCIDX, bits [23:20]" from
+ * ID_AA64MMFR2_EL1 to get the format of CCSIDR_EL1:
+ *
+ * 0b0000 - 32-bit format implemented for all levels of the CCSIDR_EL1.
+ * 0b0001 - 64-bit format implemented for all levels of the CCSIDR_EL1.
+ *
+ * Here we assume to use CCSIDR_EL1 in no CCIDX layout:
+ * NumSets, bits [27:13]: (Number of sets in cache) - 1
+ * Associativity, bits [12:3]: (Associativity of cache) - 1
+ * LineSize, bits [2:0]: (Log2(Number of bytes in cache line)) - 4
+ */
+int sysinfo_get_cache_info(u8 level, struct cache_info *cinfo)
+{
+ u64 clidr_el1;
+ u32 csselr_el1;
+ u32 num_sets;
+ union ccsidr_el1 creg;
+ int cache_type;
+
+ sysinfo_cache_info_default(cinfo);
+
+ /* Read CLIDR_EL1 */
+ asm volatile("mrs %0, clidr_el1" : "=r" (clidr_el1));
+ log_debug("CLIDR_EL1: 0x%llx\n", clidr_el1);
+
+ cache_type = (clidr_el1 >> (3 * level)) & 0x7;
+ log_debug("cache_type:%d\n", cache_type);
+
+ if (cache_type == CACHE_NONE) /* level does not exist */
+ return -1;
+
+ switch (cache_type) {
+ case CACHE_INST_ONLY:
+ cinfo->cache_type = SMBIOS_CACHE_SYSCACHE_TYPE_INSTRUCTION;
+ break;
+ case CACHE_DATA_ONLY:
+ cinfo->cache_type = SMBIOS_CACHE_SYSCACHE_TYPE_DATA;
+ break;
+ case CACHE_UNIFIED:
+ cinfo->cache_type = SMBIOS_CACHE_SYSCACHE_TYPE_UNIFIED;
+ break;
+ case CACHE_INST_WITH_DATA:
+ cinfo->cache_type = SMBIOS_CACHE_SYSCACHE_TYPE_OTHER;
+ break;
+ default:
+ cinfo->cache_type = SMBIOS_CACHE_SYSCACHE_TYPE_UNKNOWN;
+ break;
+ }
+
+ /* Select cache level */
+ csselr_el1 = (level << 1);
+ asm volatile("msr csselr_el1, %0" : : "r" (csselr_el1));
+
+ /* Read CCSIDR_EL1 */
+ asm volatile("mrs %0, ccsidr_el1" : "=r" (creg.data));
+ log_debug("CCSIDR_EL1 (Level %d): 0x%llx\n", level + 1, creg.data);
+
+ /* Extract cache size and associativity */
+ cinfo->line_size = 1 << (creg.no_ccidx.linesize + 4);
+
+ /* Map the associativity value */
+ switch (creg.no_ccidx.associativity + 1) {
+ case CACHE_ASSOC_DIRECT_MAPPED:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_DMAPPED;
+ break;
+ case CACHE_ASSOC_2WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_2WAY;
+ break;
+ case CACHE_ASSOC_4WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_4WAY;
+ break;
+ case CACHE_ASSOC_8WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_8WAY;
+ break;
+ case CACHE_ASSOC_16WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_16WAY;
+ break;
+ case CACHE_ASSOC_12WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_12WAY;
+ break;
+ case CACHE_ASSOC_24WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_24WAY;
+ break;
+ case CACHE_ASSOC_32WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_32WAY;
+ break;
+ case CACHE_ASSOC_48WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_48WAY;
+ break;
+ case CACHE_ASSOC_64WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_64WAY;
+ break;
+ case CACHE_ASSOC_20WAY:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_20WAY;
+ break;
+ default:
+ cinfo->associativity = SMBIOS_CACHE_ASSOC_UNKNOWN;
+ break;
+ }
+
+ num_sets = creg.no_ccidx.numsets + 1;
+ /* Size in KB */
+ cinfo->max_size = (cinfo->associativity * num_sets * cinfo->line_size) /
+ 1024;
+
+ log_debug("L%d Cache:\n", level + 1);
+ log_debug("Number of bytes in cache line:%u\n", cinfo->line_size);
+ log_debug("Associativity of cache:%u\n", cinfo->associativity);
+ log_debug("Number of sets in cache:%u\n", num_sets);
+ log_debug("Cache size in KB:%u\n", cinfo->max_size);
+
+ cinfo->inst_size = cinfo->max_size;
+
+ /*
+ * Below fields are set with default values for Arm arch,
+ * More information are hardware platform specific.
+ */
+ cinfo->socket_design = "Not Specified";
+ cinfo->config.fields.level = level;
+ /* Generally, "Not-Socketed" is for integrated caches */
+ cinfo->config.fields.bsocketed = SMBIOS_CACHE_UNSOCKETED;
+ /* For modern SoCs, L1/L2 cache are usually internal */
+ cinfo->config.fields.locate = SMBIOS_CACHE_LOCATE_INTERNAL;
+ cinfo->config.fields.benabled = SMBIOS_CACHE_ENABLED;
+ /* Generally, L1 and L2 caches are write-back */
+ cinfo->config.fields.opmode = SMBIOS_CACHE_OP_WB;
+
+ /*
+ * Other fields are typically specific to the implementation of the ARM
+ * processor by the silicon vendor:
+ * supp_sram_type, curr_sram_type, speed, err_corr_type
+ */
+
+ return 0;
+}
+
int sysinfo_get_processor_info(struct processor_info *pinfo)
{
u64 mpidr, core_count;
@@ -195,6 +380,9 @@ struct sysinfo_plat sysinfo_smbios_armv8 = {
/* Processor Information */
.processor = &processor_info_armv8,
+
+ /* Cache Information */
+ .cache = &cache_info_armv8[0],
};
U_BOOT_DRVINFO(sysinfo_smbios_plat) = {
--
2.25.1
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