linux-kernel - [PATCH v2 4/8] x86/MCE/AMD: Use defines for register addresses in translation code

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Date:   Thu,  3 Sep 2020 20:01:40 +0000
From:   Yazen Ghannam <Yazen.Ghannam@....com>
To:     linux-edac@...r.kernel.org
Cc:     Yazen Ghannam <Yazen.Ghannam@....com>,
        linux-kernel@...r.kernel.org, tony.luck@...el.com, x86@...nel.org,
        Smita.KoralahalliChannabasappa@....com
Subject: [PATCH v2 4/8] x86/MCE/AMD: Use defines for register addresses in translation code

From: Yazen Ghannam <yazen.ghannam@....com>

Replace raw register offset values in the AMD address translation code
with named definitions.

Also, drop comments that only note the register names.

Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lkml.kernel.org/r/20200814191449.183998-3-Yazen.Ghannam@amd.com

v1 -> v2:
* New patch based on comments for v1 Patch 2.

 arch/x86/kernel/cpu/mce/amd.c | 26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index be96f77004ad..1e0510fd5afc 100644
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -675,6 +675,14 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
 		deferred_error_interrupt_enable(c);
 }
 
+#define DF_F0_FABRICINSTINFO3	0x50
+#define DF_F0_MMIOHOLE		0x104
+#define DF_F0_DRAMBASEADDR	0x110
+#define DF_F0_DRAMLIMITADDR	0x114
+#define DF_F0_DRAMOFFSET	0x1B4
+
+#define DF_F1_SYSFABRICID	0x208
+
 int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 {
 	u64 dram_base_addr, dram_limit_addr, dram_hole_base;
@@ -691,22 +699,21 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 	u8 cs_mask, cs_id = 0;
 	bool hash_enabled = false;
 
-	/* Read D18F0x1B4 (DramOffset), check if base 1 is used. */
-	if (amd_df_indirect_read(nid, 0, 0x1B4, umc, &tmp))
+	if (amd_df_indirect_read(nid, 0, DF_F0_DRAMOFFSET, umc, &tmp))
 		goto out_err;
 
 	/* Remove HiAddrOffset from normalized address, if enabled: */
 	if (tmp & BIT(0)) {
 		u64 hi_addr_offset = (tmp & GENMASK_ULL(31, 20)) << 8;
 
+		/* Check if base 1 is used. */
 		if (norm_addr >= hi_addr_offset) {
 			ret_addr -= hi_addr_offset;
 			base = 1;
 		}
 	}
 
-	/* Read D18F0x110 (DramBaseAddress). */
-	if (amd_df_indirect_read(nid, 0, 0x110 + (8 * base), umc, &tmp))
+	if (amd_df_indirect_read(nid, 0, DF_F0_DRAMBASEADDR + (8 * base), umc, &tmp))
 		goto out_err;
 
 	/* Check if address range is valid. */
@@ -728,8 +735,7 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 		goto out_err;
 	}
 
-	/* Read D18F0x114 (DramLimitAddress). */
-	if (amd_df_indirect_read(nid, 0, 0x114 + (8 * base), umc, &tmp))
+	if (amd_df_indirect_read(nid, 0, DF_F0_DRAMLIMITADDR + (8 * base), umc, &tmp))
 		goto out_err;
 
 	intlv_num_sockets = (tmp >> 8) & 0x1;
@@ -780,12 +786,11 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 		u8 die_id_bit, sock_id_bit, cs_fabric_id;
 
 		/*
-		 * Read FabricBlockInstanceInformation3_CS[BlockFabricID].
 		 * This is the fabric id for this coherent slave. Use
 		 * umc/channel# as instance id of the coherent slave
 		 * for FICAA.
 		 */
-		if (amd_df_indirect_read(nid, 0, 0x50, umc, &tmp))
+		if (amd_df_indirect_read(nid, 0, DF_F0_FABRICINSTINFO3, umc, &tmp))
 			goto out_err;
 
 		cs_fabric_id = (tmp >> 8) & 0xFF;
@@ -800,9 +805,8 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 
 		sock_id_bit = die_id_bit;
 
-		/* Read D18F1x208 (SystemFabricIdMask). */
 		if (intlv_num_dies || intlv_num_sockets)
-			if (amd_df_indirect_read(nid, 1, 0x208, umc, &tmp))
+			if (amd_df_indirect_read(nid, 1, DF_F1_SYSFABRICID, umc, &tmp))
 				goto out_err;
 
 		/* If interleaved over more than 1 die. */
@@ -841,7 +845,7 @@ int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
 
 	/* If legacy MMIO hole enabled */
 	if (lgcy_mmio_hole_en) {
-		if (amd_df_indirect_read(nid, 0, 0x104, umc, &tmp))
+		if (amd_df_indirect_read(nid, 0, DF_F0_MMIOHOLE, umc, &tmp))
 			goto out_err;
 
 		dram_hole_base = tmp & GENMASK(31, 24);
-- 
2.25.1