Received-SPF: pass (google.com: domain of linux-kernel+bounces-121855-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3;
Received-SPF: Pass (protection.outlook.com: domain of amd.com designates
 165.204.84.17 as permitted sender) receiver=protection.outlook.com;
 client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C
From: John Allen <john.allen@amd.com>
To: <bp@alien8.de>, <linux-edac@vger.kernel.org>, <tony.luck@intel.com>,
	<yazen.ghannam@amd.com>
CC: <linux-kernel@vger.kernel.org>, <avadhut.naik@amd.com>,
	<muralidhara.mk@amd.com>, John Allen <john.allen@amd.com>
Subject: [PATCH v2 1/4] RAS/AMD/ATL: Read DRAM hole base early
Date: Wed, 27 Mar 2024 18:52:19 +0000
Message-ID: <20240327185222.98998-2-john.allen@amd.com>
In-Reply-To: <20240327185222.98998-1-john.allen@amd.com>
References: <20240327185222.98998-1-john.allen@amd.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Mar 2024 18:52:40.9973
 (UTC)
X-MS-Exchange-CrossTenant-Network-Message-Id: 6a0d7a0c-a639-4903-039a-08dc4e8f147a
X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d
X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com]
X-MS-Exchange-CrossTenant-AuthSource:
	SA2PEPF000015C6.namprd03.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Anonymous
X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem
X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB6997

Read DRAM hole base when constructing the address map as the value will
not change during run time.

Signed-off-by: John Allen <john.allen@amd.com>
---
v2:
  - Fix compilation error. ctx->addr should read ctx->ret_addr.
  - Improve commit description.
---
 drivers/ras/amd/atl/core.c     | 15 ++-------------
 drivers/ras/amd/atl/internal.h |  2 ++
 drivers/ras/amd/atl/system.c   | 21 +++++++++++++++++++++
 3 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/drivers/ras/amd/atl/core.c b/drivers/ras/amd/atl/core.c
index 6dc4e06305f7..63513d972c07 100644
--- a/drivers/ras/amd/atl/core.c
+++ b/drivers/ras/amd/atl/core.c
@@ -51,22 +51,11 @@ static bool legacy_hole_en(struct addr_ctx *ctx)
 
 static int add_legacy_hole(struct addr_ctx *ctx)
 {
-	u32 dram_hole_base;
-	u8 func = 0;
-
 	if (!legacy_hole_en(ctx))
 		return 0;
 
-	if (df_cfg.rev >= DF4)
-		func = 7;
-
-	if (df_indirect_read_broadcast(ctx->node_id, func, 0x104, &dram_hole_base))
-		return -EINVAL;
-
-	dram_hole_base &= DF_DRAM_HOLE_BASE_MASK;
-
-	if (ctx->ret_addr >= dram_hole_base)
-		ctx->ret_addr += (BIT_ULL(32) - dram_hole_base);
+	if (ctx->ret_addr >= df_cfg.dram_hole_base)
+		ctx->ret_addr += (BIT_ULL(32) - df_cfg.dram_hole_base);
 
 	return 0;
 }
diff --git a/drivers/ras/amd/atl/internal.h b/drivers/ras/amd/atl/internal.h
index 5de69e0bb0f9..1413c8ddc6c5 100644
--- a/drivers/ras/amd/atl/internal.h
+++ b/drivers/ras/amd/atl/internal.h
@@ -132,6 +132,8 @@ struct df_config {
 	/* Number of DRAM Address maps visible in a Coherent Station. */
 	u8 num_coh_st_maps;
 
+	u32 dram_hole_base;
+
 	/* Global flags to handle special cases. */
 	struct df_flags flags;
 };
diff --git a/drivers/ras/amd/atl/system.c b/drivers/ras/amd/atl/system.c
index 701349e84942..6f6fe24dec81 100644
--- a/drivers/ras/amd/atl/system.c
+++ b/drivers/ras/amd/atl/system.c
@@ -223,6 +223,21 @@ static int determine_df_rev(void)
 	return -EINVAL;
 }
 
+static int get_dram_hole_base(void)
+{
+	u8 func = 0;
+
+	if (df_cfg.rev >= DF4)
+		func = 7;
+
+	if (df_indirect_read_broadcast(0, func, 0x104, &df_cfg.dram_hole_base))
+		return -EINVAL;
+
+	df_cfg.dram_hole_base &= DF_DRAM_HOLE_BASE_MASK;
+
+	return 0;
+}
+
 static void get_num_maps(void)
 {
 	switch (df_cfg.rev) {
@@ -266,6 +281,7 @@ static void dump_df_cfg(void)
 
 	pr_debug("num_coh_st_maps=%u",			df_cfg.num_coh_st_maps);
 
+	pr_debug("dram_hole_base=%x",			df_cfg.dram_hole_base);
 	pr_debug("flags.legacy_ficaa=%u",		df_cfg.flags.legacy_ficaa);
 	pr_debug("flags.socket_id_shift_quirk=%u",	df_cfg.flags.socket_id_shift_quirk);
 }
@@ -282,6 +298,11 @@ int get_df_system_info(void)
 
 	get_num_maps();
 
+	if (get_dram_hole_base()) {
+		pr_warn("amd_atl: Failed to read DRAM hole base");
+		return -EINVAL;
+	}
+
 	dump_df_cfg();
 
 	return 0;
-- 
2.34.1