File decode-dimms-hackweek-DDR4.patch of Package i2c-tools

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File decode-dimms-hackweek-DDR4.patch of Package i2c-tools (Revision 9dea5a8cc1a93c30aa959773390f1fca)

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From: Jean Delvare <jdelvare@suse.de>
Subject: decode-dimms: Add support for DDR4 SDRAM memory
Patch-mainline: yes
Git-commit: f91ab551fa73e4fe831122fb390ac2166e66af67
Git-commit: 56149a6f847933aa6c51392bfe9d513cbc0e443d
Git-commit: 9ae51c4a4f8e1e1836470ac7e5fec9c7f6df8ce6
Git-commit: 52cd6c60d6db0e39f00a67f5931c06cccb63e178
Git-commit: eea0b508aaefd687ed559992cece05608418c605
Git-commit: 84da8192c7c409f37c1906b60ef166c58aafc847

This is my hackweek 0x10 project:
Add support for DDR4 SDRAM memory modules to decode-dimms

* Add preliminary DDR4 support
* Decode size and timings of DDR4
* Decode misc parameters of DDR4
* Decode physical characteristics of DDR4
* Documentation update for DDR4
* Verify the CRC of DDR4 data block 1
---
 eeprom/decode-dimms   |  326 ++++++++++++++++++++++++++++++++++++++++++++++++--
 eeprom/decode-dimms.1 |    7 -
 2 files changed, 320 insertions(+), 13 deletions(-)

--- a/eeprom/decode-dimms
+++ b/eeprom/decode-dimms
@@ -5,7 +5,7 @@
 # Copyright 1998, 1999 Philip Edelbrock <phil@netroedge.com>
 # modified by Christian Zuckschwerdt <zany@triq.net>
 # modified by Burkart Lingner <burkart@bollchen.de>
-# Copyright (C) 2005-2013  Jean Delvare <jdelvare@suse.de>
+# Copyright (C) 2005-2017  Jean Delvare <jdelvare@suse.de>
 #
 #    This program is free software; you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
@@ -1404,6 +1404,7 @@ sub ddr3_mtb_ftb($$$$)
 	return $byte1 * $mtb + $byte2 * $ftb / 1000;
 }
 
+# Also works for DDR4
 sub ddr3_reference_card($$)
 {
 	my ($rrc, $ext) = @_;
@@ -1702,6 +1703,251 @@ sub decode_ddr3_sdram($)
 
 }
 
+# Return combined time in ns
+sub ddr4_mtb_ftb($$$$)
+{
+	my ($byte1, $byte2, $mtb, $ftb) = @_;
+
+	# byte1 is unsigned in ps, but byte2 is signed in ps
+	$byte2 -= 0x100 if $byte2 & 0x80;
+
+	return ($byte1 * $mtb + $byte2 * $ftb) / 1000;
+}
+
+# Rounded per DDR4 specifications
+sub ddr4_core_timings($$$$$)
+{
+	my ($cas, $ctime, $trcd, $trp, $tras) = @_;
+
+	return $cas . "-" . ceil($trcd/$ctime - 0.025) .
+		      "-" . ceil($trp/$ctime - 0.025) .
+		      "-" . ceil($tras/$ctime - 0.025);
+}
+
+use constant DDR4_UNBUFFERED	=> 1;
+use constant DDR4_REGISTERED	=> 2;
+use constant DDR4_LOAD_REDUCED	=> 4;
+
+# Parameter: EEPROM bytes 0-383 (using 1-255)
+sub decode_ddr4_sdram($)
+{
+	my $bytes = shift;
+	my ($ctime, $ctime_max);
+	my ($ftb, $mtb);
+	my $ii;
+
+	my @module_types = (
+		{ type => "Extended type",	},
+		{ type => "RDIMM",		family => DDR4_REGISTERED },
+		{ type => "UDIMM",		family => DDR4_UNBUFFERED },
+		{ type => "SO-DIMM",		family => DDR4_UNBUFFERED },
+		{ type => "LRDIMM",		family => DDR4_LOAD_REDUCED },
+		{ type => "Mini-RDIMM",		family => DDR4_REGISTERED },
+		{ type => "Mini-UDIMM",		family => DDR4_UNBUFFERED },
+		{ type => "Reserved (0x07)",	},
+		{ type => "72b-SO-RDIMM",	family => DDR4_REGISTERED },
+		{ type => "72b-SO-UDIMM",	family => DDR4_UNBUFFERED },
+		{ type => "Reserved (0x0A)",	},
+		{ type => "Reserved (0x0B)",	},
+		{ type => "16b-SO-DIMM",	family => DDR4_UNBUFFERED },
+		{ type => "32b-SO-DIMM",	family => DDR4_UNBUFFERED },
+		{ type => "Reserved (0x0E)",	},
+		{ type => "No base memory",	},
+	);
+
+# SPD revision
+	printl_cond($bytes->[1] != 0xff, "SPD Revision",
+		    ($bytes->[1] >> 4) . "." . ($bytes->[1] & 0xf));
+
+	printl("Module Type", $module_types[$bytes->[3] & 0x0f]->{type});
+
+# CRC of block 1
+	my $crc_calc = calculate_crc($bytes, 128, 126);
+	my $crc_spd = ($bytes->[255] << 8) | $bytes->[254];
+	my $crc_block_1_ok = $crc_calc == $crc_spd;
+	printl("EEPROM CRC of bytes 128-253", $crc_block_1_ok ?
+		sprintf("OK (0x\%04X)", $crc_calc) :
+		sprintf("Bad\n(found 0x\%04X, calculated 0x\%04X)",
+			$crc_spd, $crc_calc));
+
+# time bases
+	if (($bytes->[17] & 0x03) != 0x00 || ($bytes->[17] & 0xc0) != 0x00) {
+		print STDERR "Unknown time base values, can't decode\n";
+		return;
+	}
+	$ftb = 1;	# ps
+	$mtb = 125;	# ps
+
+# speed
+	prints("Memory Characteristics");
+
+	$ctime = ddr4_mtb_ftb($bytes->[18], $bytes->[125], $mtb, $ftb);
+	$ctime_max = ddr4_mtb_ftb($bytes->[19], $bytes->[124], $mtb, $ftb);
+
+	my $ddrclk = 2 * (1000 / $ctime);
+	my $tbits = 8 << ($bytes->[13] & 7);
+	my $pcclk = int ($ddrclk * $tbits / 8);
+	# Round down to comply with Jedec
+	$pcclk = $pcclk - ($pcclk % 100);
+	$ddrclk = int ($ddrclk);
+	printl("Maximum module speed", "$ddrclk MHz (PC4-${pcclk})");
+
+# Size computation
+	my $sdram_width = 4 << ($bytes->[12] & 0x07);
+	my $ranks = (($bytes->[12] >> 3) & 0x07) + 1;
+	my $signal_loading = $bytes->[6] & 0x03;
+	my $die_count = (($bytes->[6] >> 4) & 0x07) + 1;
+	my $cap = (256 << ($bytes->[4] & 0x0f)) / 8;
+	$cap *= (8 << ($bytes->[13] & 0x07)) / $sdram_width;
+	$cap *= $ranks;
+	$cap *= $die_count if $signal_loading == 0x02;		# 3DS
+	printl("Size", $cap . " MB");
+
+	printl("Banks x Rows x Columns x Bits",
+	       join(' x ', (1 << ($bytes->[4] >> 6)) * (4 << (($bytes->[4] >> 4) & 0x03)),
+			   ((($bytes->[5] >> 3) & 7) + 12),
+			   ( ($bytes->[5]       & 7) +  9),
+			   (8 << ($bytes->[13] & 0x07))));
+
+	printl("SDRAM Device Width", "$sdram_width bits");
+	printl("Ranks", $ranks);
+	printl_cond($ranks > 1, "Rank Mix",
+		    $bytes->[12] & 0x40 ? "Asymmetrical" : "Symmetrical");
+	printl_cond($bytes->[13] & 0x18, "Bus Width Extension", ($bytes->[13] & 0x18)." bits");
+
+	my $taa;
+	my $trcd;
+	my $trp;
+	my $tras;
+
+	$taa  = ddr4_mtb_ftb($bytes->[24], $bytes->[123], $mtb, $ftb);
+	$trcd = ddr4_mtb_ftb($bytes->[25], $bytes->[122], $mtb, $ftb);
+	$trp  = ddr4_mtb_ftb($bytes->[26], $bytes->[121], $mtb, $ftb);
+	$tras = ((($bytes->[27] & 0x0f) << 8) + $bytes->[28]) * $mtb / 1000;
+
+	printl("AA-RCD-RP-RAS (cycles)",
+	       ddr4_core_timings(ceil($taa/$ctime - 0.025), $ctime,
+	                         $trcd, $trp, $tras));
+
+# latencies
+	my %cas;
+	my $cas_sup = ($bytes->[23] << 24) + ($bytes->[22] << 16) +
+		      ($bytes->[21] << 8) + $bytes->[20];
+	my $base_cas = $bytes->[23] & 0x80 ? 23 : 7;
+
+	for ($ii = 0; $ii < 30; $ii++) {
+		if ($cas_sup & (1 << $ii)) {
+			$cas{$base_cas + $ii}++;
+		}
+	}
+	printl("Supported CAS Latencies", cas_latencies(keys %cas));
+
+# standard DDR4 speeds
+	prints("Timings at Standard Speeds");
+	foreach my $ctime_at_speed (15/24, 15/22, 15/20, 15/18, 15/16, 15/14, 15/12) {
+		my $best_cas = 0;
+
+		# Find min CAS latency at this speed
+		for ($ii = 29; $ii >= 0; $ii--) {
+			next unless ($cas_sup & (1 << $ii));
+			if (ceil($taa/$ctime_at_speed - 0.025) <= $base_cas + $ii) {
+				$best_cas = $base_cas + $ii;
+			}
+		}
+
+		printl_cond($best_cas && $ctime_at_speed >= $ctime
+				      && $ctime_at_speed <= $ctime_max,
+			    "AA-RCD-RP-RAS (cycles)" . as_ddr(4, $ctime_at_speed),
+			    ddr4_core_timings($best_cas, $ctime_at_speed,
+					     $trcd, $trp, $tras));
+	}
+
+# more timing information
+	prints("Timing Parameters");
+
+	printl("Minimum Cycle Time (tCKmin)", tns3($ctime));
+	printl("Maximum Cycle Time (tCKmax)", tns3($ctime_max));
+	printl("Minimum CAS Latency Time (tAA)", tns3($taa));
+	printl("Minimum RAS to CAS Delay (tRCD)", tns3($trcd));
+	printl("Minimum Row Precharge Delay (tRP)", tns3($trp));
+	printl("Minimum Active to Precharge Delay (tRAS)", tns3($tras));
+	printl("Minimum Active to Auto-Refresh Delay (tRC)",
+		tns3(ddr4_mtb_ftb((($bytes->[27] & 0xf0) << 4) + $bytes->[29],
+				  $bytes->[120], $mtb, $ftb)));
+	printl("Minimum Recovery Delay (tRFC1)",
+		tns3((($bytes->[31] << 8) + $bytes->[30]) * $mtb / 1000));
+	printl("Minimum Recovery Delay (tRFC2)",
+		tns3((($bytes->[33] << 8) + $bytes->[32]) * $mtb / 1000));
+	printl("Minimum Recovery Delay (tRFC4)",
+		tns3((($bytes->[35] << 8) + $bytes->[34]) * $mtb / 1000));
+	printl("Minimum Four Activate Window Delay (tFAW)",
+		tns3(((($bytes->[36] & 0x0f) << 8) + $bytes->[37]) * $mtb / 1000));
+	printl("Minimum Row Active to Row Active Delay (tRRD_S)",
+		tns3(ddr4_mtb_ftb($bytes->[38], $bytes->[119], $mtb, $ftb)));
+	printl("Minimum Row Active to Row Active Delay (tRRD_L)",
+		tns3(ddr4_mtb_ftb($bytes->[39], $bytes->[118], $mtb, $ftb)));
+	printl("Minimum CAS to CAS Delay (tCCD_L)",
+		tns3(ddr4_mtb_ftb($bytes->[40], $bytes->[117], $mtb, $ftb)));
+
+	# Optional?
+	my $twr = ((($bytes->[41] & 0x0f) << 8) + $bytes->[42]) * $mtb / 1000;
+	printl_cond($twr, "Minimum Write Recovery Time (tWR)", tns3($twr));
+	my $twtr = ((($bytes->[43] & 0x0f) << 8) + $bytes->[44]) * $mtb / 1000;
+	printl_cond($twtr, "Minimum Write to Read Time (tWTR_S)", tns3($twtr));
+	$twtr = ((($bytes->[43] & 0xf0) << 4) + $bytes->[45]) * $mtb / 1000;
+	printl_cond($twtr, "Minimum Write to Read Time (tWTR_L)", tns3($twtr));
+
+# miscellaneous stuff
+	prints("Other Information");
+
+	my $package_type = ($bytes->[6] & 0x80) == 0x00 ? "Monolithic" :
+			   $signal_loading == 0x01 ? "Multi-load stack" :
+			   $signal_loading == 0x02 ? "3DS" : "Unknown";
+	$package_type .= sprintf(" (%u dies)", $die_count) if $die_count >= 2;
+	printl("Package Type", $package_type);
+
+	my @mac = ("Untested",
+		   "700 K", "600 K", "500 K", "400 K", "300 K", "200 K",
+		   undef, "Unlimited");
+	my $mac = $bytes->[7] & 0x0f;
+	printl_cond(defined $mac[$mac], "Maximum Activate Count", $mac[$mac]);
+
+	my $ppr = $bytes->[9] >> 6;
+	printl("Post Package Repair",
+	       $ppr == 0x00 ? "Not supported" :
+	       $ppr == 0x01 ? "One row per bank group" : "Unknown");
+	printl_cond($ppr != 0x00, "Soft PPR", $bytes->[9] & 0x20 ?
+		    "Supported" : "Not Supported");
+
+	printl("Module Nominal Voltage",
+	       $bytes->[11] & 0x01 ? "1.2 V" :
+	       $bytes->[11] & 0x02 ? "Unknown (1.2 V endurant)" : "Unknown");
+
+	printl("Thermal Sensor",
+	       $bytes->[14] & 0x80 ? "TSE2004 compliant" : "No");
+
+# type-specific settings
+	return unless $crc_block_1_ok || $opt_igncheck;
+
+	if ($module_types[$bytes->[3] & 0x0f]->{family} == DDR4_UNBUFFERED ||
+	    $module_types[$bytes->[3] & 0x0f]->{family} == DDR4_REGISTERED ||
+	    $module_types[$bytes->[3] & 0x0f]->{family} == DDR4_LOAD_REDUCED) {
+		prints("Physical Characteristics");
+
+		my $height = $bytes->[128] & 0x1f;
+		printl("Module Height",
+		       $height == 0x00 ? "15 mm or less" :
+		       $height == 0x1f ? "more than 45 mm" :
+		       sprintf("%u mm", $height + 15));
+		printl("Module Thickness",
+		       sprintf("%d mm front, %d mm back",
+			       ($bytes->[129] & 0x0f) + 1,
+			       (($bytes->[129] >> 4) & 15) + 1));
+		printl("Module Reference Card",
+		       ddr3_reference_card($bytes->[130], $bytes->[128]));
+	}
+}
+
 # Parameter: EEPROM bytes 0-127 (using 4-5)
 sub decode_direct_rambus($)
 {
@@ -1747,6 +1993,10 @@ sub decode_rambus($)
 	"DDR SDRAM"	=> \&decode_ddr_sdram,
 	"DDR2 SDRAM"	=> \&decode_ddr2_sdram,
 	"DDR3 SDRAM"	=> \&decode_ddr3_sdram,
+	"DDR4 SDRAM"	=> \&decode_ddr4_sdram,
+	"DDR4E SDRAM"	=> \&decode_ddr4_sdram,
+	"LPDDR4 SDRAM"	=> \&decode_ddr4_sdram,
+	"LPDDR4X SDRAM"	=> \&decode_ddr4_sdram,
 	"Direct Rambus"	=> \&decode_direct_rambus,
 	"Rambus"	=> \&decode_rambus,
 );
@@ -1819,6 +2069,35 @@ sub decode_ddr3_mfg_data($)
 		    sprintf("0x%02X%02X", $bytes->[146], $bytes->[147]));
 }
 
+# Parameter: EEPROM bytes 0-383 (using 320-351)
+sub decode_ddr4_mfg_data($)
+{
+	my $bytes = shift;
+
+	prints("Manufacturer Data");
+
+	printl("Module Manufacturer",
+	       manufacturer_ddr3($bytes->[320], $bytes->[321]));
+
+	printl_cond(spd_written(@{$bytes}[350..351]),
+		    "DRAM Manufacturer",
+		    manufacturer_ddr3($bytes->[350], $bytes->[351]));
+
+	printl_mfg_location_code($bytes->[322]);
+
+	printl_cond(spd_written(@{$bytes}[323..324]),
+		    "Manufacturing Date",
+		    manufacture_date($bytes->[323], $bytes->[324]));
+
+	printl_mfg_assembly_serial(@{$bytes}[325..328]);
+
+	printl("Part Number", part_number(@{$bytes}[329..348]));
+
+	printl_cond(spd_written(@{$bytes}[349]),
+		    "Revision Code",
+		    sprintf("0x%02X", $bytes->[349]));
+}
+
 # Parameter: EEPROM bytes 0-127 (using 64-98)
 sub decode_manufacturing_information($)
 {
@@ -1941,8 +2220,14 @@ sub read_hexdump($)
 sub spd_sizes($)
 {
 	my $bytes = shift;
+	my $type = $bytes->[2];
 
-	if ($bytes->[2] >= 9) {
+	if ($type == 12 || $type == 14 || $type == 16 || $type == 17) {
+		# DDR4
+		my $spd_len = 256 * (($bytes->[0] >> 4) & 7);
+		my $used = 128 * ($bytes->[0] & 15);
+		return ($spd_len, $used);
+	} elsif ($type >= 9) {
 		# For FB-DIMM and newer, decode number of bytes written
 		my $spd_len = ($bytes->[0] >> 4) & 7;
 		my $size = 64 << ($bytes->[0] & 15);
@@ -2014,15 +2299,14 @@ sub checksum($)
 }
 
 # Calculate and verify CRC
-sub check_crc($)
+sub calculate_crc($$$)
 {
-	my $bytes = shift;
+	my ($bytes, $start, $len) = @_;
 	my $crc = 0;
-	my $crc_cover = $bytes->[0] & 0x80 ? 116 : 125;
-	my $crc_ptr = 0;
+	my $crc_ptr = $start;
 	my $crc_bit;
 
-	while ($crc_ptr <= $crc_cover) {
+	while ($crc_ptr < $start + $len) {
 		$crc = $crc ^ ($bytes->[$crc_ptr] << 8);
 		for ($crc_bit = 0; $crc_bit < 8; $crc_bit++) {
 			if ($crc & 0x8000) {
@@ -2033,7 +2317,15 @@ sub check_crc($)
 		}
 		$crc_ptr++;
 	}
-	$crc &= 0xffff;
+
+	return $crc & 0xffff;
+}
+
+sub check_crc($)
+{
+	my $bytes = shift;
+	my $crc_cover = $bytes->[0] & 0x80 ? 116 : 125;
+	my $crc = calculate_crc($bytes, 0, $crc_cover + 1);
 
 	my $dimm_crc = ($bytes->[127] << 8) | $bytes->[126];
 	return ("EEPROM CRC of bytes 0-$crc_cover",
@@ -2136,7 +2428,9 @@ sub get_dimm_list
 	my (@dirs, $dir, $opened, $file, @files);
 
 	if ($use_sysfs) {
-		@dirs = ('/sys/bus/i2c/drivers/eeprom', '/sys/bus/i2c/drivers/at24');
+		@dirs = ('/sys/bus/i2c/drivers/eeprom',
+			 '/sys/bus/i2c/drivers/at24',
+			 '/sys/bus/i2c/drivers/ee1004');	# DDR4
 	} else {
 		@dirs = ('/proc/sys/dev/sensors');
 	}
@@ -2154,7 +2448,9 @@ sub get_dimm_list
 				# or spd (driver at24)
 				my $attr = sysfs_device_attribute("$dir/$file", "name");
 				next unless defined $attr &&
-					    ($attr eq "eeprom" || $attr eq "spd");
+					    ($attr eq "eeprom" ||
+					     $attr eq "spd" ||
+					     $attr eq "ee1004");	# DDR4
 			} else {
 				next unless $file =~ /^eeprom-/;
 			}
@@ -2285,6 +2581,9 @@ for $current (0 .. $#dimm) {
 			"DDR SGRAM", "DDR SDRAM",	# 6, 7
 			"DDR2 SDRAM", "FB-DIMM",	# 8, 9
 			"FB-DIMM Probe", "DDR3 SDRAM",	# 10, 11
+			"DDR4 SDRAM", "Reserved",	# 12, 13
+			"DDR4E SDRAM", "LPDDR3 SDRAM",	# 14, 15
+			"LPDDR4 SDRAM", "LPDDR4X SDRAM", # 16, 17
 		);
 		if ($bytes[2] < @type_list) {
 			$type = $type_list[$bytes[2]];
@@ -2300,6 +2599,13 @@ for $current (0 .. $#dimm) {
 		# Decode DDR3-specific manufacturing data in bytes
 		# 117-149
 		decode_ddr3_mfg_data(\@bytes)
+	} elsif ($type eq "DDR4 SDRAM" ||
+		 $type eq "DDR4E SDRAM" ||
+		 $type eq "LPDDR4 SDRAM" ||
+		 $type eq "LPDDR4X SDRAM") {
+		# Decode DDR4-specific manufacturing data in bytes
+		# 320-383
+		decode_ddr4_mfg_data(\@bytes)
 	} else {
 		# Decode next 35 bytes (64-98, common to most
 		# memory types)
--- a/eeprom/decode-dimms.1
+++ b/eeprom/decode-dimms.1
@@ -1,6 +1,7 @@
 .\"
 .\"  decode-dimms.1 - manpage for the i2c-tools/decode-dimms utility
 .\"  Copyright (C) 2013  Jaromir Capik
+.\"  Copyright (C) 2017  Jean Delvare
 .\"
 .\"  This program is free software; you can redistribute it and/or modify
 .\"  it under the terms of the GNU General Public License as published by
@@ -16,7 +17,7 @@
 .\"  with this program; if not, write to the Free Software Foundation, Inc.,
 .\"  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 .\"
-.TH decode-dimms 1 "Oct 2013" "i2c-tools" "User Commands"
+.TH decode-dimms 1 "Nov 2017" "i2c-tools" "User Commands"
 .SH NAME
 decode-dimms \- decode the information found in memory module SPD EEPROMs
 .SH SYNOPSIS
@@ -31,8 +32,8 @@ The purpose of the
 .B decode-dimms
 tool is to decode the information found in memory module SPD EEPROMs.
 The SPD data is read either from the running system or dump files.
-In the former case, the tool requires either the eeprom kernel module
-or the at24 kernel module to be loaded.
+In the former case, the tool requires a kernel module to be loaded:
+eeprom, at24 or ee1004 (for DDR4 SDRAM.)
 .SH PARAMETERS
 .TP
 .B \-f, --format

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File decode-dimms-hackweek-DDR4.patch of Package i2c-tools (Revision 9dea5a8cc1a93c30aa959773390f1fca)

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