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From:   Yazen Ghannam <yazen.ghannam@amd.com>
To:     <bp@alien8.de>, <linux-edac@vger.kernel.org>
CC:     <linux-kernel@vger.kernel.org>,
        <Smita.KoralahalliChannabasappa@amd.com>, <muralidhara.mk@amd.com>,
        <naveenkrishna.chatradhi@amd.com>,
        Yazen Ghannam <yazen.ghannam@amd.com>
Subject: [PATCH 08/18] EDAC/amd64: Add determine_memory_type() into pvt->ops
Date:   Mon, 9 May 2022 14:55:24 +0000
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From: Muralidhara M K <muralidhara.mk@amd.com>

GPU Nodes will need to set the EDAC memory type differently than
existing systems. A function pointer should be used rather than introduce
another branching condition.

Prepare for this by adding determine_memory_type() to pvt->ops and set it
as needed based on currently supported systems.

Use a "umc" prefix for modern systems, since these use Unified Memory
Controllers (UMCs).

Use a "dct" prefix for newly-defined legacy functions, since these
systems use DRAM Controllers (DCTs).

Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
Signed-off-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@amd.com>
[Rebased/reworked patch and reworded commit message]
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
 drivers/edac/amd64_edac.c | 16 +++++++---------
 drivers/edac/amd64_edac.h |  1 +
 2 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 6e26bbb73f81..a767d8a6bfe8 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1604,7 +1604,7 @@ static void dct_read_base_mask(struct amd64_pvt *pvt)
 	}
 }
 
-static void determine_memory_type_df(struct amd64_pvt *pvt)
+static void umc_determine_memory_type(struct amd64_pvt *pvt)
 {
 	struct amd64_umc *umc;
 	u32 i;
@@ -1641,13 +1641,10 @@ static void determine_memory_type_df(struct amd64_pvt *pvt)
 	}
 }
 
-static void determine_memory_type(struct amd64_pvt *pvt)
+static void dct_determine_memory_type(struct amd64_pvt *pvt)
 {
 	u32 dram_ctrl, dcsm;
 
-	if (pvt->umc)
-		return determine_memory_type_df(pvt);
-
 	switch (pvt->fam) {
 	case 0xf:
 		if (pvt->ext_model >= K8_REV_F)
@@ -1697,6 +1694,8 @@ static void determine_memory_type(struct amd64_pvt *pvt)
 		WARN(1, KERN_ERR "%s: Family??? 0x%x\n", __func__, pvt->fam);
 		pvt->dram_type = MEM_EMPTY;
 	}
+
+	edac_dbg(1, "  DIMM type: %s\n", edac_mem_types[pvt->dram_type]);
 	return;
 
 ddr3:
@@ -3302,10 +3301,7 @@ static void read_mc_regs(struct amd64_pvt *pvt)
 
 	pvt->ops->read_base_mask(pvt);
 
-	determine_memory_type(pvt);
-
-	if (!pvt->umc)
-		edac_dbg(1, "  DIMM type: %s\n", edac_mem_types[pvt->dram_type]);
+	pvt->ops->determine_memory_type(pvt);
 
 	determine_ecc_sym_sz(pvt);
 }
@@ -3763,6 +3759,7 @@ static struct low_ops umc_ops = {
 	.dbam_to_cs			= umc_addr_mask_to_cs_size,
 	.prep_chip_selects		= umc_prep_chip_selects,
 	.read_base_mask			= umc_read_base_mask,
+	.determine_memory_type		= umc_determine_memory_type,
 };
 
 /* Use Family 16h versions for defaults and adjust as needed below. */
@@ -3772,6 +3769,7 @@ static struct low_ops dct_ops = {
 	.dbam_to_cs			= f16_dbam_to_chip_select,
 	.prep_chip_selects		= dct_prep_chip_selects,
 	.read_base_mask			= dct_read_base_mask,
+	.determine_memory_type		= dct_determine_memory_type,
 };
 
 static int per_family_init(struct amd64_pvt *pvt)
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index c81cc7f5fc96..da3db0f4f59b 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -470,6 +470,7 @@ struct low_ops {
 			   unsigned int cs_mode, int cs_mask_nr);
 	void (*prep_chip_selects)(struct amd64_pvt *pvt);
 	void (*read_base_mask)(struct amd64_pvt *pvt);
+	void (*determine_memory_type)(struct amd64_pvt *pvt);
 };
 
 int __amd64_read_pci_cfg_dword(struct pci_dev *pdev, int offset,
-- 
2.25.1