linux-kernel - [PATCH 2/4] RAS: ATL: Expand helpers for adding and removing base and hole

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Date: Thu, 14 Mar 2024 16:35:25 +0000
From: John Allen <john.allen@....com>
To: <bp@...en8.de>, <linux-edac@...r.kernel.org>, <tony.luck@...el.com>
CC: <linux-kernel@...r.kernel.org>, <avadhut.naik@....com>,
	<yazen.ghannam@....com>, <muralidhara.mk@....com>, John Allen
	<john.allen@....com>
Subject: [PATCH 2/4] RAS: ATL: Expand helpers for adding and removing base and hole

Data fabric 4.5 denormalization will need to frequently add and remove
the base and the legacy MMIO hole. Modify existing helpers to improve DF
4.5 denormalization flow and add helper to remove the base and hole.

Signed-off-by: John Allen <john.allen@....com>
---
 drivers/ras/amd/atl/core.c     | 43 ++++++++++++++++++++++------------
 drivers/ras/amd/atl/internal.h |  3 +++
 2 files changed, 31 insertions(+), 15 deletions(-)

diff --git a/drivers/ras/amd/atl/core.c b/drivers/ras/amd/atl/core.c
index c1710d233adb..cafdfc57d929 100644
--- a/drivers/ras/amd/atl/core.c
+++ b/drivers/ras/amd/atl/core.c
@@ -49,15 +49,26 @@ static bool legacy_hole_en(struct addr_ctx *ctx)
 	return FIELD_GET(DF_LEGACY_MMIO_HOLE_EN, reg);
 }
 
-static int add_legacy_hole(struct addr_ctx *ctx)
+static u64 add_legacy_hole(struct addr_ctx *ctx, u64 addr)
 {
 	if (!legacy_hole_en(ctx))
-		return 0;
+		return addr;
 
-	if (ctx->addr >= df_cfg.dram_hole_base)
-		ctx->addr += (BIT_ULL(32) - df_cfg.dram_hole_base);
+	if (addr >= df_cfg.dram_hole_base)
+		addr += (BIT_ULL(32) - df_cfg.dram_hole_base);
 
-	return 0;
+	return addr;
+}
+
+static u64 remove_legacy_hole(struct addr_ctx *ctx, u64 addr)
+{
+	if (!legacy_hole_en(ctx))
+		return addr;
+
+	if (addr >= df_cfg.dram_hole_base)
+		addr -= (BIT_ULL(32) - df_cfg.dram_hole_base);
+
+	return addr;
 }
 
 static u64 get_base_addr(struct addr_ctx *ctx)
@@ -72,14 +83,16 @@ static u64 get_base_addr(struct addr_ctx *ctx)
 	return base_addr << DF_DRAM_BASE_LIMIT_LSB;
 }
 
-static int add_base_and_hole(struct addr_ctx *ctx)
+u64 add_base_and_hole(struct addr_ctx *ctx, u64 addr)
 {
-	ctx->ret_addr += get_base_addr(ctx);
-
-	if (add_legacy_hole(ctx))
-		return -EINVAL;
+	addr += get_base_addr(ctx);
+	return add_legacy_hole(ctx, addr);
+}
 
-	return 0;
+u64 remove_base_and_hole(struct addr_ctx *ctx, u64 addr)
+{
+	addr -= get_base_addr(ctx);
+	return remove_legacy_hole(ctx, addr);
 }
 
 static bool late_hole_remove(struct addr_ctx *ctx)
@@ -123,14 +136,14 @@ unsigned long norm_to_sys_addr(u8 socket_id, u8 die_id, u8 coh_st_inst_id, unsig
 	if (denormalize_address(&ctx))
 		return -EINVAL;
 
-	if (!late_hole_remove(&ctx) && add_base_and_hole(&ctx))
-		return -EINVAL;
+	if (!late_hole_remove(&ctx))
+		ctx.ret_addr = add_base_and_hole(&ctx, ctx.ret_addr);
 
 	if (dehash_address(&ctx))
 		return -EINVAL;
 
-	if (late_hole_remove(&ctx) && add_base_and_hole(&ctx))
-		return -EINVAL;
+	if (late_hole_remove(&ctx))
+		ctx.ret_addr = add_base_and_hole(&ctx, ctx.ret_addr);
 
 	if (addr_over_limit(&ctx))
 		return -EINVAL;
diff --git a/drivers/ras/amd/atl/internal.h b/drivers/ras/amd/atl/internal.h
index 1413c8ddc6c5..05b870fcb24e 100644
--- a/drivers/ras/amd/atl/internal.h
+++ b/drivers/ras/amd/atl/internal.h
@@ -236,6 +236,9 @@ int dehash_address(struct addr_ctx *ctx);
 unsigned long norm_to_sys_addr(u8 socket_id, u8 die_id, u8 coh_st_inst_id, unsigned long addr);
 unsigned long convert_umc_mca_addr_to_sys_addr(struct atl_err *err);
 
+u64 add_base_and_hole(struct addr_ctx *ctx, u64 addr);
+u64 remove_base_and_hole(struct addr_ctx *ctx, u64 addr);
+
 /*
  * Make a gap in @data that is @num_bits long starting at @bit_num.
  * e.g. data		= 11111111'b
-- 
2.34.1