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From:   Yazen Ghannam <Yazen.Ghannam@amd.com>
To:     linux-edac@vger.kernel.org
Cc:     Yazen Ghannam <Yazen.Ghannam@amd.com>,
        linux-kernel@vger.kernel.org, tony.luck@intel.com, x86@kernel.org,
        Smita.KoralahalliChannabasappa@amd.com
Subject: [PATCH v2 8/8] x86/MCE/AMD Support new memory interleaving modes during address translation
Date:   Thu,  3 Sep 2020 20:01:44 +0000
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From: Muralidhara M K <muralidhara.mk@amd.com>

Add support for new memory interleaving modes used in current AMD systems.

Check if the system is using a current Data Fabric version or a legacy
version as some bit and register definitions have changed.

Tested on AMD reference platforms with the following memory interleaving
options.

Naples
- None
- Channel
- Die
- Socket

Rome (NPS = Nodes per Socket)
- None
- NPS0
- NPS1
- NPS2
- NPS4

The fixes tag refers to the commit that allows amd64_edac_mod to load on
Rome systems. The module may report an incorrect system addresses on
Rome systems depending on the interleaving option used.

Fixes: 6e846239e548 ("EDAC/amd64: Add Family 17h Model 30h PCI IDs")
Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
Co-developed-by: Naveen Krishna Chtradhi <naveenkrishna.chatradhi@amd.com>
Signed-off-by: Naveen Krishna Chtradhi <naveenkrishna.chatradhi@amd.com>
Co-developed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
Link:
https://lkml.kernel.org/r/20200814191449.183998-3-Yazen.Ghannam@amd.com

v1 -> v2:
* Rebased on cleanup patches.
* Save and use the Data Fabric version.
* Reorder code to execute non-legacy flows first. This change wasn't
  made to the section with the "hashed_bit" calculation, since the
  current flow reads easier IMHO.

 arch/x86/kernel/cpu/mce/amd.c | 222 ++++++++++++++++++++++++++--------
 1 file changed, 172 insertions(+), 50 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index f5440f8000e9..c14076bcabf2 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -683,8 +683,10 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
 #define DF_F0_DRAMBASEADDR	0x110
 #define DF_F0_DRAMLIMITADDR	0x114
 #define DF_F0_DRAMOFFSET	0x1B4
+#define DF_F0_DFGLOBALCTRL	0x3F8
 
 #define DF_F1_SYSFABRICID	0x208
+#define DF_F1_SYSFABRICID1	0x20C
 
 int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 {
@@ -695,22 +697,30 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 	u32 dram_hole_base;
 
 	u32 reg_dram_base_addr, reg_dram_limit_addr;
-	u32 reg_dram_offset;
+	u32 reg_dram_offset, reg_sys_fabric_id;
+
+	bool hash_enabled = false, split_normalized = false;
 
-	u8 die_id_shift, die_id_mask, socket_id_shift, socket_id_mask;
 	u8 intlv_num_dies, intlv_num_chan, intlv_num_sockets;
-	u8 intlv_addr_sel, intlv_addr_bit;
-	u8 num_intlv_bits, hashed_bit;
+	u8 intlv_addr_sel, intlv_addr_bit, num_intlv_bits;
+	u8 cs_mask, cs_id = 0, dst_fabric_id = 0;
 	u8 lgcy_mmio_hole_en, base = 0;
-	u8 cs_mask, cs_id = 0;
-	bool hash_enabled = false;
+	u8 df_version;
+
+	if (amd_df_indirect_read(nid, 1, DF_F1_SYSFABRICID, umc, &reg_sys_fabric_id))
+		goto out_err;
+
+	df_version = (reg_sys_fabric_id & 0xFF) ? 3 : 2;
 
 	if (amd_df_indirect_read(nid, 0, DF_F0_DRAMOFFSET, umc, &reg_dram_offset))
 		goto out_err;
 
 	/* Remove HiAddrOffset from normalized address, if enabled: */
 	if (reg_dram_offset & BIT(0)) {
-		u64 hi_addr_offset = get_bits(reg_dram_offset, 31, 20) << 28;
+		u8 hi_addr_offset_lsb = (df_version >= 3) ? 12 : 20;
+		u64 hi_addr_offset = get_bits(reg_dram_offset, 31, hi_addr_offset_lsb);
+
+		hi_addr_offset <<= 28;
 
 		/* Check if base 1 is used. */
 		if (norm_addr >= hi_addr_offset) {
@@ -733,19 +743,23 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 		goto out_err;
 
 	lgcy_mmio_hole_en = get_bit(reg_dram_base_addr, 1);
-	intlv_num_chan	  = get_bits(reg_dram_base_addr, 7, 4);
-	intlv_addr_sel	  = get_bits(reg_dram_base_addr, 10, 8);
 	dram_base_addr	  = get_bits(reg_dram_base_addr, 31, 12) << 28;
-
-	intlv_num_sockets = get_bit(reg_dram_limit_addr, 8);
-	intlv_num_dies	  = get_bits(reg_dram_limit_addr, 11, 10);
 	dram_limit_addr	  = (get_bits(reg_dram_limit_addr, 31, 12) << 28) | GENMASK_ULL(27, 0);
 
-	/* {0, 1, 2, 3} map to address bits {8, 9, 10, 11} respectively */
-	if (intlv_addr_sel > 3) {
-		pr_err("%s: Invalid interleave address select %d.\n",
-			__func__, intlv_addr_sel);
-		goto out_err;
+	if (df_version >= 3) {
+		intlv_num_chan    = get_bits(reg_dram_base_addr, 5, 2);
+		intlv_num_dies    = get_bits(reg_dram_base_addr, 7, 6);
+		intlv_num_sockets = get_bit(reg_dram_base_addr, 8);
+		intlv_addr_sel    = get_bits(reg_dram_base_addr, 11, 9);
+
+		dst_fabric_id	  = get_bits(reg_dram_limit_addr, 9, 0);
+	} else {
+		intlv_num_chan	  = get_bits(reg_dram_base_addr, 7, 4);
+		intlv_addr_sel	  = get_bits(reg_dram_base_addr, 10, 8);
+
+		dst_fabric_id	  = get_bits(reg_dram_limit_addr, 7, 0);
+		intlv_num_sockets = get_bit(reg_dram_limit_addr, 8);
+		intlv_num_dies	  = get_bits(reg_dram_limit_addr, 11, 10);
 	}
 
 	intlv_addr_bit = intlv_addr_sel + 8;
@@ -758,27 +772,42 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 	case 5:	intlv_num_chan = 3; break;
 	case 7:	intlv_num_chan = 4; break;
 
-	case 8: intlv_num_chan = 1;
+	case 8:
+		if (df_version >= 3) {
+			intlv_num_chan = 5;
+		} else {
+			intlv_num_chan = 1;
+			hash_enabled = true;
+		}
+		break;
+	case 12:
+		intlv_num_chan = 1;
 		hash_enabled = true;
 		break;
+	case 13:
+		intlv_num_chan = 2;
+		hash_enabled = true;
+		split_normalized = true;
+		break;
+	case 14:
+		intlv_num_chan = 3;
+		hash_enabled = true;
+		split_normalized = true;
+		break;
 	default:
 		pr_err("%s: Invalid number of interleaved channels %d.\n",
 			__func__, intlv_num_chan);
 		goto out_err;
 	}
 
-	num_intlv_bits = intlv_num_chan;
-
-	if (intlv_num_dies > 2) {
-		pr_err("%s: Invalid number of interleaved nodes/dies %d.\n",
-			__func__, intlv_num_dies);
+	/* Assert interleave address bit is 8 or 9 for hashing cases. */
+	if (hash_enabled && intlv_addr_bit != 8 && intlv_addr_bit != 9) {
+		pr_err("%s: Invalid interleave address bit for hashing %d.\n",
+			__func__, intlv_addr_bit);
 		goto out_err;
 	}
 
-	num_intlv_bits += intlv_num_dies;
-
-	/* Add a bit if sockets are interleaved. */
-	num_intlv_bits += intlv_num_sockets;
+	num_intlv_bits = intlv_num_chan + intlv_num_dies + intlv_num_sockets;
 
 	/* Assert num_intlv_bits <= 4 */
 	if (num_intlv_bits > 4) {
@@ -788,9 +817,11 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 	}
 
 	if (num_intlv_bits > 0) {
-		u64 temp_addr_x, temp_addr_i, temp_addr_y;
-		u32 reg_sys_fabric_id, cs_fabric_id;
+		u8 cs_fabric_id_msb = (df_version >= 3) ? 13 : 15;
 		u8 die_id_bit, sock_id_bit;
+		u64 addr_x, addr_y, addr_z;
+		u8 node_id_shift = 0;
+		u32 cs_fabric_id;
 
 		/*
 		 * This is the fabric id for this coherent slave. Use
@@ -800,7 +831,7 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 		if (amd_df_indirect_read(nid, 0, DF_F0_FABRICINSTINFO3, umc, &cs_fabric_id))
 			goto out_err;
 
-		cs_fabric_id = get_bits(cs_fabric_id, 15, 8);
+		cs_fabric_id = get_bits(cs_fabric_id, cs_fabric_id_msb, 8);
 		die_id_bit   = 0;
 
 		/* If interleaved over more than 1 channel: */
@@ -808,43 +839,83 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 			die_id_bit = intlv_num_chan;
 			cs_mask	   = (1 << die_id_bit) - 1;
 			cs_id	   = cs_fabric_id & cs_mask;
+			cs_id	  -= dst_fabric_id & cs_mask;
 		}
 
 		sock_id_bit = die_id_bit;
 
-		if (intlv_num_dies || intlv_num_sockets)
-			if (amd_df_indirect_read(nid, 1, DF_F1_SYSFABRICID, umc, &reg_sys_fabric_id))
+		if ((intlv_num_dies || intlv_num_sockets) && df_version >= 3) {
+			if (amd_df_indirect_read(nid, 1, DF_F1_SYSFABRICID1, umc, &reg_sys_fabric_id))
 				goto out_err;
 
+			node_id_shift = get_bits(reg_sys_fabric_id, 3, 0);
+		}
+
 		/* If interleaved over more than 1 die. */
 		if (intlv_num_dies) {
+			u8 die_id_shift, die_id_mask;
+
 			sock_id_bit  = die_id_bit + intlv_num_dies;
-			die_id_shift = get_bits(reg_sys_fabric_id, 27, 24);
-			die_id_mask  = get_bits(reg_sys_fabric_id, 15, 8);
+
+			if (df_version >= 3) {
+				die_id_shift = get_bits(reg_sys_fabric_id, 3, 0) + node_id_shift;
+
+				die_id_mask  = get_bits(reg_sys_fabric_id, 18, 16);
+				die_id_mask <<= node_id_shift;
+			} else {
+				die_id_shift = get_bits(reg_sys_fabric_id, 27, 24);
+				die_id_mask  = get_bits(reg_sys_fabric_id, 15, 8);
+			}
 
 			cs_id |= ((cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit;
 		}
 
 		/* If interleaved over more than 1 socket. */
 		if (intlv_num_sockets) {
-			socket_id_shift	= get_bits(reg_sys_fabric_id, 31, 28);
-			socket_id_mask	= get_bits(reg_sys_fabric_id, 23, 16);
+			u8 socket_id_shift, socket_id_mask;
+
+			if (df_version >= 3) {
+				socket_id_shift	= get_bits(reg_sys_fabric_id, 10, 8);
+				socket_id_shift += node_id_shift;
+
+				socket_id_mask	= get_bits(reg_sys_fabric_id, 26, 24);
+				socket_id_mask <<= node_id_shift;
+			} else {
+				socket_id_shift	= get_bits(reg_sys_fabric_id, 31, 28);
+				socket_id_mask	= get_bits(reg_sys_fabric_id, 23, 16);
+			}
 
 			cs_id |= ((cs_fabric_id & socket_id_mask) >> socket_id_shift) << sock_id_bit;
 		}
 
 		/*
 		 * The pre-interleaved address consists of XXXXXXIIIYYYYY
-		 * where III is the ID for this CS, and XXXXXXYYYYY are the
-		 * address bits from the post-interleaved address.
-		 * "num_intlv_bits" has been calculated to tell us how many "I"
-		 * bits there are. "intlv_addr_bit" tells us how many "Y" bits
-		 * there are (where "I" starts).
+		 * or XXXXXXIIZZZIYYY where III is the ID for this CS, and
+		 * XXXXXXZZZYYYYY are the address bits from the post-interleaved
+		 * address. "num_intlv_bits" has been calculated to tell us how
+		 * many "I" bits there are. "intlv_addr_bit" tells us how many
+		 * "Y" bits there are (where "I" starts).
+		 *
+		 * The "split" III is only used in the COD modes, where there
+		 * is one bit I at "intlv_addr_bit", and the remaining CS bits
+		 * are higher up starting at bit 12.
 		 */
-		temp_addr_y = get_bits(ret_addr, intlv_addr_bit-1, 0);
-		temp_addr_i = (cs_id << intlv_addr_bit);
-		temp_addr_x = (ret_addr & GENMASK_ULL(63, intlv_addr_bit)) << num_intlv_bits;
-		ret_addr    = temp_addr_x | temp_addr_i | temp_addr_y;
+		addr_y = get_bits(ret_addr, intlv_addr_bit - 1, 0);
+
+		if (split_normalized) {
+			addr_x = ret_addr & GENMASK_ULL(63, 11);
+			addr_x <<= num_intlv_bits;
+
+			addr_z = ret_addr & GENMASK_ULL(10, intlv_addr_bit);
+			addr_z <<= 1;
+		} else {
+			addr_x = ret_addr & GENMASK_ULL(63, intlv_addr_bit);
+			addr_x <<= num_intlv_bits;
+
+			addr_z = 0;
+		}
+
+		ret_addr = addr_x | addr_z | addr_y;
 	}
 
 	/* Add dram base address */
@@ -860,18 +931,69 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 			ret_addr += (BIT_ULL(32) - dram_hole_base);
 	}
 
-	if (hash_enabled) {
-		hashed_bit =	get_bit(ret_addr, 12) ^
+	/*
+	 * There are three cases for hashing:
+	 * 1) No Hashing
+	 * 2) Legacy Hashing
+	 * 3) Cluster-on-Die (COD) Hashing
+	 */
+	if (!hash_enabled) {
+		/* Fill in the interleave bit. */
+		if (intlv_num_chan)
+			ret_addr |= (cs_id << intlv_addr_bit);
+	} else if (df_version == 2) {
+		/* Legacy 2ch hash. */
+		u8 hashed_bit =	get_bit(ret_addr, 12) ^
 				get_bit(ret_addr, 18) ^
 				get_bit(ret_addr, 21) ^
 				get_bit(ret_addr, 30) ^
 				get_bit(cs_id, 0);
 
-		if (hashed_bit != get_bit(ret_addr, intlv_addr_bit))
-			ret_addr ^= BIT(intlv_addr_bit);
+		ret_addr ^= hashed_bit << intlv_addr_bit;
+	} else {
+		u8 hashed_bit, hash_ctl_64K, hash_ctl_2M, hash_ctl_1G;
+		u32 reg_df_global_ctrl;
+
+		if (amd_df_indirect_read(nid, 0, DF_F0_DFGLOBALCTRL, umc, &reg_df_global_ctrl))
+			goto out_err;
+
+		hash_ctl_64K = get_bit(reg_df_global_ctrl, 20);
+		hash_ctl_2M  = get_bit(reg_df_global_ctrl, 21);
+		hash_ctl_1G  = get_bit(reg_df_global_ctrl, 22);
+
+		/* COD with 2ch, 4ch, or 8ch hash. */
+		hashed_bit =	get_bit(ret_addr, 14) ^
+				(get_bit(ret_addr, 18) & hash_ctl_64K) ^
+				(get_bit(ret_addr, 23) & hash_ctl_2M) ^
+				(get_bit(ret_addr, 32) & hash_ctl_1G) ^
+				get_bit(cs_id, 0);
+
+		ret_addr ^= hashed_bit << intlv_addr_bit;
+
+		/* COD with 4ch or 8ch hash. */
+		if ((intlv_num_chan == 2) || (intlv_num_chan == 3)) {
+			hashed_bit =	get_bit(ret_addr, 12) ^
+					(get_bit(ret_addr, 16) & hash_ctl_64K) ^
+					(get_bit(ret_addr, 21) & hash_ctl_2M) ^
+					(get_bit(ret_addr, 30) & hash_ctl_1G) ^
+					get_bit(cs_id, 1);
+
+			ret_addr ^= hashed_bit << 12;
+		}
+
+		/* COD with 8ch hash. */
+		if (intlv_num_chan == 3) {
+			hashed_bit =	get_bit(ret_addr, 13) ^
+					(get_bit(ret_addr, 17) & hash_ctl_64K) ^
+					(get_bit(ret_addr, 22) & hash_ctl_2M) ^
+					(get_bit(ret_addr, 31) & hash_ctl_1G) ^
+					get_bit(cs_id, 2);
+
+			ret_addr ^= hashed_bit << 13;
+		}
 	}
 
-	/* Is calculated system address is above DRAM limit address? */
+	/* Is calculated system address above DRAM limit address? */
 	if (ret_addr > dram_limit_addr)
 		goto out_err;
 
-- 
2.25.1