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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 07/18] EDAC/amd64: Add read_base_mask() into pvt->ops
Date:   Mon, 9 May 2022 14:55:23 +0000
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From: Muralidhara M K <muralidhara.mk@amd.com>

GPU Nodes will need to set the read the Base and Mask values differently
than existing systems. A function pointer should be used rather than
introduce another branching condition.

Prepare for this by adding read_base_mask() 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 | 11 +++++------
 drivers/edac/amd64_edac.h |  1 +
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index f8cd89278753..6e26bbb73f81 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1507,7 +1507,7 @@ static void umc_prep_chip_selects(struct amd64_pvt *pvt)
 	}
 }
 
-static void read_umc_base_mask(struct amd64_pvt *pvt)
+static void umc_read_base_mask(struct amd64_pvt *pvt)
 {
 	u32 umc_base_reg, umc_base_reg_sec;
 	u32 umc_mask_reg, umc_mask_reg_sec;
@@ -1561,13 +1561,10 @@ static void read_umc_base_mask(struct amd64_pvt *pvt)
 /*
  * Function 2 Offset F10_DCSB0; read in the DCS Base and DCS Mask registers
  */
-static void read_dct_base_mask(struct amd64_pvt *pvt)
+static void dct_read_base_mask(struct amd64_pvt *pvt)
 {
 	int cs;
 
-	if (pvt->umc)
-		return read_umc_base_mask(pvt);
-
 	for_each_chip_select(cs, 0, pvt) {
 		int reg0   = DCSB0 + (cs * 4);
 		int reg1   = DCSB1 + (cs * 4);
@@ -3303,7 +3300,7 @@ static void read_mc_regs(struct amd64_pvt *pvt)
 skip:
 	pvt->ops->prep_chip_selects(pvt);
 
-	read_dct_base_mask(pvt);
+	pvt->ops->read_base_mask(pvt);
 
 	determine_memory_type(pvt);
 
@@ -3765,6 +3762,7 @@ static struct low_ops umc_ops = {
 	.early_channel_count		= umc_early_channel_count,
 	.dbam_to_cs			= umc_addr_mask_to_cs_size,
 	.prep_chip_selects		= umc_prep_chip_selects,
+	.read_base_mask			= umc_read_base_mask,
 };
 
 /* Use Family 16h versions for defaults and adjust as needed below. */
@@ -3773,6 +3771,7 @@ static struct low_ops dct_ops = {
 	.map_sysaddr_to_csrow		= f1x_map_sysaddr_to_csrow,
 	.dbam_to_cs			= f16_dbam_to_chip_select,
 	.prep_chip_selects		= dct_prep_chip_selects,
+	.read_base_mask			= dct_read_base_mask,
 };
 
 static int per_family_init(struct amd64_pvt *pvt)
diff --git a/drivers/edac/amd64_edac.h b/drivers/edac/amd64_edac.h
index 0a7738df396f..c81cc7f5fc96 100644
--- a/drivers/edac/amd64_edac.h
+++ b/drivers/edac/amd64_edac.h
@@ -469,6 +469,7 @@ struct low_ops {
 	int  (*dbam_to_cs)(struct amd64_pvt *pvt, u8 dct,
 			   unsigned int cs_mode, int cs_mask_nr);
 	void (*prep_chip_selects)(struct amd64_pvt *pvt);
+	void (*read_base_mask)(struct amd64_pvt *pvt);
 };
 
 int __amd64_read_pci_cfg_dword(struct pci_dev *pdev, int offset,
-- 
2.25.1