amd/amdfam10: Control Fam15h cache partitioning via nvram

Add options to control cache partitioning and overall memory
performance via nvram.

Change-Id: I3dd5d7f3640aee0395a68645c0242307605d3ce7
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/12041
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

src/cpu/amd/family_10h-family_15h/defaults.h

@@ -135,9 +135,8 @@ static const struct {
 	  0x00000000, 1 << (42-32)},	/* Bx [PwcDisableWalkerSharing]=1 */
 
 	{ BU_CFG3, AMD_OR_C0, AMD_PTYPE_ALL,
-	  (0x3 << 20) | (0x1 << 22), 0x00000000,
+	  1 << 22, 0x00000000,
-	  (0x3 << 20) | (0x1 << 22), 0x00000000},	/* C0 or above [PfcDoubleStride]=1,
+	  1 << 22, 0x00000000},		/* C0 or above [PfcDoubleStride]=1 */
-	  						   PfcStrideMul]=0x3 */
 
 	{ EX_CFG, AMD_OR_C0, AMD_PTYPE_ALL,
 	  0x00000000, 1 << (54-32),

src/cpu/amd/family_10h-family_15h/init_cpus.c

@@ -953,6 +953,7 @@ void cpuSetAMDMSR(uint8_t node_id)
 	 */
 	msr_t msr;
 	u8 i;
+	uint8_t nvram;
 	u32 platform;
 	uint64_t revision;
 	uint8_t enable_c_states;
@@ -977,6 +978,13 @@ void cpuSetAMDMSR(uint8_t node_id)
 
 	/* Revision C0 and above */
 	if (revision & AMD_OR_C0) {
+		uint8_t enable_experimental_memory_speed_boost;
+
+		/* Check to see if cache partitioning is allowed */
+		enable_experimental_memory_speed_boost = 0;
+		if (get_option(&nvram, "experimental_memory_speed_boost") == CB_SUCCESS)
+			enable_experimental_memory_speed_boost = !!nvram;
+
 		uint32_t f3x1fc = pci_read_config32(NODE_PCI(node_id, 3), 0x1fc);
 		msr = rdmsr(FP_CFG);
 		msr.hi &= ~(0x7 << (42-32));			/* DiDtCfg4 */
@@ -996,11 +1004,15 @@ void cpuSetAMDMSR(uint8_t node_id)
 		msr.lo &= ~(0x1 << 16);				/* DiDtMode */
 		msr.lo |= ((f3x1fc & 0x1) << 16);
 		wrmsr(FP_CFG, msr);
+
+		if (enable_experimental_memory_speed_boost) {
+			msr = rdmsr(BU_CFG3);
+			msr.lo |= (0x3 << 20);			/* PfcStrideMul = 0x3 */
+			wrmsr(BU_CFG3, msr);
+		}
 	}
 
 #if IS_ENABLED(CONFIG_SOUTHBRIDGE_AMD_SB700) || IS_ENABLED(CONFIG_SOUTHBRIDGE_AMD_SB800)
-	uint8_t nvram;
-
 	if (revision & (AMD_DR_GT_D0 | AMD_FAM15_ALL)) {
 		/* Set up message triggered C1E */
 		msr = rdmsr(0xc0010055);

src/mainboard/asus/kgpe-d16/cmos.default

@@ -20,6 +20,9 @@ cpu_cc6_state = Enable
 sata_ahci_mode = Enable
 sata_alpm = Disable
 maximum_p_state_limit = 0xf
+probe_filter = Auto
+l3_cache_partitioning = Disable
 ieee1394_controller = Enable
+experimental_memory_speed_boost = Disable
 power_on_after_fail = On
 boot_option = Fallback

src/mainboard/asus/kgpe-d16/cmos.layout

@@ -44,8 +44,11 @@ entries
 468          1       e       1        sata_alpm
 469          4       h       0        maximum_p_state_limit
 473          2       e       13       dimm_spd_checksum
-475          1       r       0        allow_spd_nvram_cache_restore
+475          1       e       14       probe_filter
-477          1       e       1        ieee1394_controller
+476          1       e       1        l3_cache_partitioning
+477          1       e       1        experimental_memory_speed_boost
+478          1       r       0        allow_spd_nvram_cache_restore
+479          1       e       1        ieee1394_controller
 728        256       h       0        user_data
 984         16       h       0        check_sum
 # Reserve the extended AMD configuration registers
@@ -142,6 +145,8 @@ enumerations
 13    0     Enforce
 13    1     Ignore
 13    2     Override
+14    0     Disable
+14    1     Auto
 
 checksums
 

src/northbridge/amd/amdfam10/northbridge.c

@@ -1650,6 +1650,17 @@ static void detect_and_enable_probe_filter(device_t dev)
 {
 	uint32_t dword;
 
+	uint8_t nvram;
+	uint8_t enable_probe_filter;
+
+	/* Check to see if the probe filter is allowed */
+	enable_probe_filter = 1;
+	if (get_option(&nvram, "probe_filter") == CB_SUCCESS)
+		enable_probe_filter = !!nvram;
+
+	if (!enable_probe_filter)
+		return;
+
 	uint8_t fam15h = 0;
 	uint8_t rev_gte_d = 0;
 	uint8_t dual_node = 0;
@@ -1810,6 +1821,17 @@ static void detect_and_enable_cache_partitioning(device_t dev)
 	uint8_t i;
 	uint32_t dword;
 
+	uint8_t nvram;
+	uint8_t enable_l3_cache_partitioning;
+
+	/* Check to see if cache partitioning is allowed */
+	enable_l3_cache_partitioning = 0;
+	if (get_option(&nvram, "l3_cache_partitioning") == CB_SUCCESS)
+		enable_l3_cache_partitioning = !!nvram;
+
+	if (!enable_l3_cache_partitioning)
+		return;
+
 	if (is_fam15h()) {
 		printk(BIOS_DEBUG, "Enabling L3 cache partitioning\n");
 

src/northbridge/amd/amdmct/mct_ddr3/mct_d.c

@@ -5559,6 +5559,14 @@ static void mct_FinalMCT_D(struct MCTStatStruc *pMCTstat,
 				mct_ExtMCTConfig_Dx(pDCTstat);
 			} else {
 				/* Family 15h CPUs */
+				uint8_t nvram;
+				uint8_t enable_experimental_memory_speed_boost;
+
+				/* Check to see if cache partitioning is allowed */
+				enable_experimental_memory_speed_boost = 0;
+				if (get_option(&nvram, "experimental_memory_speed_boost") == CB_SUCCESS)
+					enable_experimental_memory_speed_boost = !!nvram;
+
 				val = 0x0ce00f00;		/* FlushWrOnStpGnt = 0x0 */
 				val |= 0x10 << 2;		/* MctWrLimit = 0x10 */
 				val |= 0x1;			/* DctWrLimit = 0x1 */
@@ -5572,7 +5580,8 @@ static void mct_FinalMCT_D(struct MCTStatStruc *pMCTstat,
 				val &= ~(0x7 << 8);		/* CohPrefPrbLmt = 0x1 */
 				val |= (0x1 << 8);
 				val |= (0x1 << 12);		/* EnSplitDctLimits = 0x1 */
-				val |= (0x1 << 20);		/* DblPrefEn = 0x1 */
+				if (enable_experimental_memory_speed_boost)
+					val |= (0x1 << 20);	/* DblPrefEn = 0x1 */
 				val |= (0x7 << 22);		/* PrefFourConf = 0x7 */
 				val |= (0x7 << 25);		/* PrefFiveConf = 0x7 */
 				val &= ~(0xf << 28);		/* DcqBwThrotWm = 0x0 */