mb, soc: Add the SPD_CACHE_ENABLE

In order to cache the spd data which reads from the memory module, we
add SPD_CACHE_ENABLE option to enable the cache for the spd data. If
this option is enabled, the RW_SPD_CACHE region needs to be added to
the flash layout for caching the data.
Since the user may remove the memory module after the bios caching the
data, we need to add the invalidate flag to invalidate the mrc cache.
Otherwise, the bios will use the mrc cache and can make the device
malfunction.

BUG=b:200243989
BRANCH=firmware-brya-14505.B
TEST=build pass and enable this feature to the brask
     the device could speed up around 150ms with this feature.

Change-Id: If7625a00c865dc268e2a22efd71b34b40c40877b
Signed-off-by: Zhuohao Lee <zhuohao@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62294
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/mainboard/google/brya/romstage.c

@@ -13,6 +13,7 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	const struct mb_cfg *mem_config = variant_memory_params();
 	bool half_populated = variant_is_half_populated();
 	struct mem_spd spd_info;
+	bool dimms_changed = false;
 
 	memset(&spd_info, 0, sizeof(spd_info));
 	variant_get_spd_info(&spd_info);
@@ -20,7 +21,11 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	const struct pad_config *pads;
 	size_t pads_num;
 
-	memcfg_init(m_cfg, mem_config, &spd_info, half_populated);
+	memcfg_init(m_cfg, mem_config, &spd_info, half_populated, &dimms_changed);
+	if (dimms_changed) {
+		memupd->FspmArchUpd.NvsBufferPtr = 0;
+		memupd->FspmArchUpd.BootMode = FSP_BOOT_WITH_FULL_CONFIGURATION;
+	}
 
 	pads = variant_romstage_gpio_table(&pads_num);
 	gpio_configure_pads(pads, pads_num);

src/mainboard/intel/adlrvp/romstage_fsp_params.c

@@ -48,6 +48,7 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	const struct mb_cfg *mem_config = variant_memory_params();
 	int board_id = get_board_id();
 	const bool half_populated = false;
+	bool dimms_changed = false;
 
 	const struct mem_spd memory_down_spd_info = {
 		.topo = MEM_TOPO_MEMORY_DOWN,
@@ -72,7 +73,8 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	case ADL_P_DDR4_1:
 	case ADL_P_DDR4_2:
 	case ADL_P_DDR5_1:
-		memcfg_init(m_cfg, mem_config, &dimm_module_spd_info, half_populated);
+		memcfg_init(m_cfg, mem_config, &dimm_module_spd_info, half_populated,
+				&dimms_changed);
 		break;
 	case ADL_P_DDR5_2:
 	case ADL_P_LP4_1:
@@ -82,7 +84,8 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	case ADL_M_LP4:
 	case ADL_M_LP5:
 	case ADL_N_LP5:
-		memcfg_init(m_cfg, mem_config, &memory_down_spd_info, half_populated);
+		memcfg_init(m_cfg, mem_config, &memory_down_spd_info, half_populated,
+				&dimms_changed);
 		break;
 	default:
 		die("Unknown board id = 0x%x\n", board_id);

src/mainboard/intel/shadowmountain/romstage.c

@@ -12,11 +12,12 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	FSP_M_CONFIG *m_cfg = &memupd->FspmConfig;
 	const struct mb_cfg *mem_config = variant_memory_params();
 	const bool half_populated = false;
+	bool dimms_changed = false;
 
 	const struct mem_spd lp5_spd_info = {
 		.topo = MEM_TOPO_MEMORY_DOWN,
 		.cbfs_index = variant_memory_sku(),
 	};
 
-	memcfg_init(m_cfg, mem_config, &lp5_spd_info, half_populated);
+	memcfg_init(m_cfg, mem_config, &lp5_spd_info, half_populated, &dimms_changed);
 }

src/mainboard/prodrive/atlas/romstage_fsp_params.c

@@ -32,6 +32,7 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 	FSP_M_CONFIG *m_cfg = &memupd->FspmConfig;
 	const struct mb_cfg *mem_config = &ddr5_mem_config;
 	const bool half_populated = false;
+	bool dimms_changed = false;
 
 	const struct mem_spd dimm_module_spd_info = {
 		.topo = MEM_TOPO_DIMM_MODULE,
@@ -47,5 +48,5 @@ void mainboard_memory_init_params(FSPM_UPD *memupd)
 		},
 	};
 
-	memcfg_init(m_cfg, mem_config, &dimm_module_spd_info, half_populated);
+	memcfg_init(m_cfg, mem_config, &dimm_module_spd_info, half_populated, &dimms_changed);
 }

src/soc/intel/alderlake/include/soc/meminit.h

@@ -110,6 +110,6 @@ struct mb_cfg {
 };
 
 void memcfg_init(FSP_M_CONFIG *mem_cfg, const struct mb_cfg *mb_cfg,
-		 const struct mem_spd *spd_info, bool half_populated);
+		 const struct mem_spd *spd_info, bool half_populated, bool *dimms_changed);
 
 #endif /* _SOC_ALDERLAKE_MEMINIT_H_ */

src/soc/intel/alderlake/meminit.c

@@ -236,7 +236,7 @@ static void ddr5_fill_dimm_module_info(FSP_M_CONFIG *mem_cfg, const struct mb_cf
 }
 
 void memcfg_init(FSP_M_CONFIG *mem_cfg, const struct mb_cfg *mb_cfg,
-		 const struct mem_spd *spd_info, bool half_populated)
+		 const struct mem_spd *spd_info, bool half_populated, bool *dimms_changed)
 {
 	struct mem_channel_data data;
 	bool dq_dqs_auto_detect = false;
@@ -278,7 +278,8 @@ void memcfg_init(FSP_M_CONFIG *mem_cfg, const struct mb_cfg *mb_cfg,
 		die("Unsupported memory type(%d)\n", mb_cfg->type);
 	}
 
-	mem_populate_channel_data(&soc_mem_cfg[mb_cfg->type], spd_info, half_populated, &data);
+	mem_populate_channel_data(&soc_mem_cfg[mb_cfg->type], spd_info, half_populated, &data,
+			dimms_changed);
 	mem_init_spd_upds(mem_cfg, &data);
 	mem_init_dq_upds(mem_cfg, &data, mb_cfg, dq_dqs_auto_detect);
 	mem_init_dqs_upds(mem_cfg, &data, mb_cfg, dq_dqs_auto_detect);

src/soc/intel/common/block/include/intelblocks/meminit.h

@@ -134,11 +134,13 @@ struct mem_channel_data {
  *                 the mainboard.
  * spd_info      : Information about the memory topology.
  * half_populated: Hint from mainboard if channels are half populated.
+ * dimms_changed: True if the dimms is changed after caching the spd data.
  */
 void mem_populate_channel_data(const struct soc_mem_cfg *soc_mem_cfg,
 				const struct mem_spd *spd_info,
 				bool half_populated,
-				struct mem_channel_data *data);
+				struct mem_channel_data *data,
+				bool *dimms_changed);
 
 /*
  * Given a channel number and the maximum number of supported channels, this

src/soc/intel/common/block/memory/Kconfig

@@ -28,4 +28,12 @@ config MRC_CHANNEL_WIDTH
 	  support is expected to set MRC_CHANNEL_WIDTH as per the FSP
 	  MRC expectation.
 
+config SPD_CACHE_ENABLE
+	bool
+	default n
+	help
+	  Enable to cache the spd data to the RW_SPD_CACHE region. If
+	  this option is enabled, please make sure the RW_SPD_CACHE
+	  region is added to the flash layout.
+
 endif

src/soc/intel/common/block/memory/meminit.c

@@ -5,6 +5,7 @@
 #include <intelblocks/meminit.h>
 #include <commonlib/region.h>
 #include <spd_bin.h>
+#include <spd_cache.h>
 #include <string.h>
 #include <types.h>
 
@@ -96,7 +97,7 @@ static void read_spd_md(const struct soc_mem_cfg *soc_mem_cfg, const struct mem_
 
 static bool read_spd_dimm(const struct soc_mem_cfg *soc_mem_cfg, const struct mem_spd *info,
 			bool half_populated, struct mem_channel_data *channel_data,
-			size_t *spd_len)
+			size_t *spd_len, bool *dimms_changed)
 {
 	size_t ch, dimm;
 	struct spd_block blk = { 0 };
@@ -108,6 +109,7 @@ static bool read_spd_dimm(const struct soc_mem_cfg *soc_mem_cfg, const struct me
 	 * channel is marked as populated.
 	 */
 	uint32_t pop_mask = 0;
+	*dimms_changed = false;
 
 	if (!(info->topo & MEM_TOPO_DIMM_MODULE))
 		return false;
@@ -119,7 +121,46 @@ static bool read_spd_dimm(const struct soc_mem_cfg *soc_mem_cfg, const struct me
 		}
 	}
 
-	get_spd_smbus(&blk);
+	if (CONFIG(SPD_CACHE_ENABLE)) {
+		uint8_t *spd_cache;
+		size_t spd_cache_sz;
+		bool need_update_cache = false;
+		bool dimm_changed = true;
+
+		/* load spd cache from RW_SPD_CACHE */
+		if (load_spd_cache(&spd_cache, &spd_cache_sz) == CB_SUCCESS) {
+			if (!spd_cache_is_valid(spd_cache, spd_cache_sz)) {
+				printk(BIOS_WARNING, "Invalid SPD cache\n");
+			} else {
+				dimm_changed = check_if_dimm_changed(spd_cache, &blk);
+				if (dimm_changed) {
+					/*
+					 * Set flag to indicate that the
+					 * mrc_cache need to be invalidated
+					 */
+					printk(BIOS_INFO,
+					"DIMM change, invalidate cache.\n");
+					*dimms_changed = true;
+				}
+			}
+			need_update_cache = true;
+		}
+
+		if (!dimm_changed) {
+			printk(BIOS_INFO, "Use the SPD cache data\n");
+			spd_fill_from_cache(spd_cache, &blk);
+		} else {
+			/* Access memory info through SMBUS. */
+			get_spd_smbus(&blk);
+
+			if (need_update_cache &&
+				update_spd_cache(&blk) == CB_ERR)
+				printk(BIOS_ERR, "update SPD cache failed\n");
+		}
+	} else {
+		get_spd_smbus(&blk);
+	}
+
 	*spd_len = blk.len;
 
 	for (ch = 0; ch < num_phys_ch; ch++) {
@@ -145,7 +186,8 @@ static bool read_spd_dimm(const struct soc_mem_cfg *soc_mem_cfg, const struct me
 void mem_populate_channel_data(const struct soc_mem_cfg *soc_mem_cfg,
 				const struct mem_spd *spd_info,
 				bool half_populated,
-				struct mem_channel_data *data)
+				struct mem_channel_data *data,
+				bool *dimms_changed)
 {
 	size_t spd_md_len = 0, spd_dimm_len = 0;
 	bool have_dimms;
@@ -153,7 +195,8 @@ void mem_populate_channel_data(const struct soc_mem_cfg *soc_mem_cfg,
 	memset(data, 0, sizeof(*data));
 
 	read_spd_md(soc_mem_cfg, spd_info, half_populated, data, &spd_md_len);
-	have_dimms = read_spd_dimm(soc_mem_cfg, spd_info, half_populated, data, &spd_dimm_len);
+	have_dimms = read_spd_dimm(soc_mem_cfg, spd_info, half_populated, data,
+				&spd_dimm_len, dimms_changed);
 
 	if (data->ch_population_flags == NO_CHANNEL_POPULATED)
 		die("No channels are populated. Incorrect memory configuration!\n");

src/soc/intel/tigerlake/meminit.c

@@ -151,11 +151,13 @@ void memcfg_init(FSP_M_CONFIG *mem_cfg, const struct mb_cfg *mb_cfg,
 		 const struct mem_spd *spd_info, bool half_populated)
 {
 	struct mem_channel_data data;
+	bool dimms_changed = false;
 
 	if (mb_cfg->type >= ARRAY_SIZE(soc_mem_cfg))
 		die("Invalid memory type(%x)!\n", mb_cfg->type);
 
-	mem_populate_channel_data(&soc_mem_cfg[mb_cfg->type], spd_info, half_populated, &data);
+	mem_populate_channel_data(&soc_mem_cfg[mb_cfg->type], spd_info, half_populated, &data,
+			&dimms_changed);
 	mem_init_spd_upds(mem_cfg, &data);
 	mem_init_dq_upds(mem_cfg, &data, mb_cfg);
 	mem_init_dqs_upds(mem_cfg, &data, mb_cfg);