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From:   Yazen Ghannam <yazen.ghannam@amd.com>
To:     <linux-edac@vger.kernel.org>
CC:     <linux-kernel@vger.kernel.org>, <bp@alien8.de>,
        <mchehab@kernel.org>, <tony.luck@intel.com>, <james.morse@arm.com>,
        <rric@kernel.org>, <Smita.KoralahalliChannabasappa@amd.com>,
        <william.roche@oracle.com>, "Yazen Ghannam" <yazen.ghannam@amd.com>
Subject: [PATCH v2 2/2] EDAC/amd64: Add new register offset support and related changes
Date:   Wed, 15 Dec 2021 15:53:09 +0000
Message-ID: <20211215155309.2711917-3-yazen.ghannam@amd.com>
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 (UTC)
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Introduce a "family flags" bitmask that can be used to indicate any
special behavior needed on a per-family basis.

Add a flag to indicate a system uses the new register offsets introduced
with Family 19h Model 10h.

Use this flag to account for register offset changes, a new bitfield
indicating DDR5 use on a memory controller, and to set the proper number
of chip select masks.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
Link:
https://lkml.kernel.org/r/20211208174356.1997855-5-yazen.ghannam@amd.com

v1->v2:
* Was patch 4 in v1.
* Change "has_ddr5" flag to "zn_regs_v2".
* Drop flag check helper function.
* Update determine_memory_type() to check bitfield for DDR5.
* Update code comments.

 drivers/edac/amd64_edac.c | 59 +++++++++++++++++++++++++++++++++++----
 drivers/edac/amd64_edac.h | 14 ++++++++++
 2 files changed, 67 insertions(+), 6 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 1df763128483..b7dd87636155 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -15,6 +15,31 @@ static struct msr __percpu *msrs;
 
 static struct amd64_family_type *fam_type;
 
+/* Family flag helpers */
+static inline u64 get_addr_cfg(void)
+{
+	if (fam_type->flags.zn_regs_v2)
+		return UMCCH_ADDR_CFG_DDR5;
+
+	return UMCCH_ADDR_CFG;
+}
+
+static inline u64 get_addr_mask_sec(void)
+{
+	if (fam_type->flags.zn_regs_v2)
+		return UMCCH_ADDR_MASK_SEC_DDR5;
+
+	return UMCCH_ADDR_MASK_SEC;
+}
+
+static inline u64 get_dimm_cfg(void)
+{
+	if (fam_type->flags.zn_regs_v2)
+		return UMCCH_DIMM_CFG_DDR5;
+
+	return UMCCH_DIMM_CFG;
+}
+
 /* Per-node stuff */
 static struct ecc_settings **ecc_stngs;
 
@@ -1429,8 +1454,10 @@ static void __dump_misc_regs_df(struct amd64_pvt *pvt)
 		edac_dbg(1, "UMC%d x16 DIMMs present: %s\n",
 				i, (umc->dimm_cfg & BIT(7)) ? "yes" : "no");
 
-		if (pvt->dram_type == MEM_LRDDR4) {
-			amd_smn_read(pvt->mc_node_id, umc_base + UMCCH_ADDR_CFG, &tmp);
+		if (pvt->dram_type == MEM_LRDDR4 || pvt->dram_type == MEM_LRDDR5) {
+			amd_smn_read(pvt->mc_node_id,
+				     umc_base + get_addr_cfg(),
+				     &tmp);
 			edac_dbg(1, "UMC%d LRDIMM %dx rank multiply\n",
 					i, 1 << ((tmp >> 4) & 0x3));
 		}
@@ -1505,7 +1532,7 @@ static void prep_chip_selects(struct amd64_pvt *pvt)
 
 		for_each_umc(umc) {
 			pvt->csels[umc].b_cnt = 4;
-			pvt->csels[umc].m_cnt = 2;
+			pvt->csels[umc].m_cnt = fam_type->flags.zn_regs_v2 ? 4 : 2;
 		}
 
 	} else {
@@ -1545,7 +1572,7 @@ static void read_umc_base_mask(struct amd64_pvt *pvt)
 		}
 
 		umc_mask_reg = get_umc_base(umc) + UMCCH_ADDR_MASK;
-		umc_mask_reg_sec = get_umc_base(umc) + UMCCH_ADDR_MASK_SEC;
+		umc_mask_reg_sec = get_umc_base(umc) + get_addr_mask_sec();
 
 		for_each_chip_select_mask(cs, umc, pvt) {
 			mask = &pvt->csels[umc].csmasks[cs];
@@ -1628,6 +1655,20 @@ static void determine_memory_type(struct amd64_pvt *pvt)
 			dimm_cfg |= pvt->umc[i].dimm_cfg;
 		}
 
+		/*
+		 * Check if the system supports the "DDR Type" field in UMC Config
+		 * and has DDR5 DIMMs in use.
+		 */
+		if (fam_type->flags.zn_regs_v2 && ((umc_cfg & GENMASK(2, 0)) == 0x1)) {
+			if (dimm_cfg & BIT(5))
+				pvt->dram_type = MEM_LRDDR5;
+			else if (dimm_cfg & BIT(4))
+				pvt->dram_type = MEM_RDDR5;
+			else
+				pvt->dram_type = MEM_DDR5;
+			return;
+		}
+
 		if (dimm_cfg & BIT(5))
 			pvt->dram_type = MEM_LRDDR4;
 		else if (dimm_cfg & BIT(4))
@@ -2174,8 +2215,13 @@ static int f17_addr_mask_to_cs_size(struct amd64_pvt *pvt, u8 umc,
 	 * There is one mask per DIMM, and two Chip Selects per DIMM.
 	 *	CS0 and CS1 -> DIMM0
 	 *	CS2 and CS3 -> DIMM1
+	 *
+	 *	Systems with newer register layout have one mask per Chip Select.
 	 */
-	dimm = csrow_nr >> 1;
+	if (fam_type->flags.zn_regs_v2)
+		dimm = csrow_nr;
+	else
+		dimm = csrow_nr >> 1;
 
 	/* Asymmetric dual-rank DIMM support. */
 	if ((csrow_nr & 1) && (cs_mode & CS_ODD_SECONDARY))
@@ -2937,6 +2983,7 @@ static struct amd64_family_type family_types[] = {
 		.f0_id = PCI_DEVICE_ID_AMD_19H_M10H_DF_F0,
 		.f6_id = PCI_DEVICE_ID_AMD_19H_M10H_DF_F6,
 		.max_mcs = 12,
+		.flags.zn_regs_v2 = 1,
 		.ops = {
 			.early_channel_count	= f17_early_channel_count,
 			.dbam_to_cs		= f17_addr_mask_to_cs_size,
@@ -3365,7 +3412,7 @@ static void __read_mc_regs_df(struct amd64_pvt *pvt)
 		umc_base = get_umc_base(i);
 		umc = &pvt->umc[i];
 
-		amd_smn_read(nid, umc_base + UMCCH_DIMM_CFG, &umc->dimm_cfg);
+		amd_smn_read(nid, umc_base + get_dimm_cfg(), &umc->dimm_cfg);
 		amd_smn_read(nid, umc_base + UMCCH_UMC_CFG, &umc->umc_cfg);
 		amd_smn_read(nid, umc_base + UMCCH_SDP_CTRL, &umc->sdp_ctrl);
 		amd_smn_read(nid, umc_base + UMCCH_ECC_CTRL, &umc->ecc_ctrl);
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index 650cab401e21..39ecb77873db 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -271,8 +271,11 @@
 #define UMCCH_BASE_ADDR_SEC		0x10
 #define UMCCH_ADDR_MASK			0x20
 #define UMCCH_ADDR_MASK_SEC		0x28
+#define UMCCH_ADDR_MASK_SEC_DDR5	0x30
 #define UMCCH_ADDR_CFG			0x30
+#define UMCCH_ADDR_CFG_DDR5		0x40
 #define UMCCH_DIMM_CFG			0x80
+#define UMCCH_DIMM_CFG_DDR5		0x90
 #define UMCCH_UMC_CFG			0x100
 #define UMCCH_SDP_CTRL			0x104
 #define UMCCH_ECC_CTRL			0x14C
@@ -477,11 +480,22 @@ struct low_ops {
 					 unsigned cs_mode, int cs_mask_nr);
 };
 
+struct amd64_family_flags {
+	/*
+	 * Indicates that the system supports the new register offsets, etc.
+	 * first introduced with Family 19h Model 10h.
+	 */
+	__u64 zn_regs_v2	: 1,
+
+	      __reserved	: 63;
+};
+
 struct amd64_family_type {
 	const char *ctl_name;
 	u16 f0_id, f1_id, f2_id, f6_id;
 	/* Maximum number of memory controllers per die/node. */
 	u8 max_mcs;
+	struct amd64_family_flags flags;
 	struct low_ops ops;
 };
 
-- 
2.25.1