linux-kernel - [PATCH v3 32/33] EDAC/amd64: Save the number of block instances

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Date:   Thu, 28 Oct 2021 17:57:27 +0000
From:   Yazen Ghannam <yazen.ghannam@....com>
To:     <linux-edac@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <bp@...en8.de>,
        <mchehab@...nel.org>, <tony.luck@...el.com>, <james.morse@....com>,
        <rric@...nel.org>, <Smita.KoralahalliChannabasappa@....com>,
        <NaveenKrishna.Chatradhi@....com>, <Muralidhara.MK@....com>,
        Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH v3 32/33] EDAC/amd64: Save the number of block instances

Cache the number of block instances. This value is needed by future DF
versions.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
v2->v3:
* New in v3.

 drivers/edac/amd64_edac.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 07009901a283..bc1aa6292408 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1092,6 +1092,7 @@ struct addr_ctx {
 	u8 intlv_num_sockets;
 	u8 cs_id;
 	u8 node_id_shift;
+	u8 num_blk_instances;
 	bool late_hole_remove;
 	int (*dehash_addr)(struct addr_ctx *ctx);
 	void (*make_space_for_cs_id)(struct addr_ctx *ctx);
@@ -1417,6 +1418,17 @@ struct data_fabric_ops df3_ops = {
 
 struct data_fabric_ops *df_ops;
 
+static int get_blk_inst_cnt(struct addr_ctx *ctx)
+{
+	/* Read D18F0x40 (FabricBlockInstanceCount). */
+	if (df_indirect_read_broadcast(0, 0, 0x40, &ctx->tmp))
+		return -EINVAL;
+
+	ctx->num_blk_instances = ctx->tmp & 0xFF;
+
+	return 0;
+}
+
 static int get_dram_offset_reg(struct addr_ctx *ctx)
 {
 	/* Read D18F0x1B4 (DramOffset) */
@@ -1621,6 +1633,9 @@ static int umc_normaddr_to_sysaddr(u64 *addr, u16 nid, u8 df_inst_id)
 	ctx.nid = nid;
 	ctx.inst_id = df_inst_id;
 
+	if (get_blk_inst_cnt(&ctx))
+		return -EINVAL;
+
 	if (df_ops->get_masks(&ctx))
 		return -EINVAL;
 
-- 
2.25.1