[PATCH v4 01/24] EDAC/amd64: Define Data Fabric operations

[Yazen Ghannam]

Define a stub to hold operations for different Data Fabric versions.
This will be filled in following patches.

Set the operations at init-time as appropriate for each model/family
group.

Also, start a glossary of acronyms used in the translation code.

Signed-off-by: Yazen Ghannam <yazen.ghannam@xxxxxxx>
---
Link:
https://lore.kernel.org/r/20211028175728.121452-6-yazen.ghannam@xxxxxxx

v3->v4:
* Started glossary.
* Included pr_debug() for failing case.

v2->v3:
* Was patch 6 in v2.
* "df_ops" is set at init time.

v1->v2:
* New in v2.

 drivers/edac/amd64_edac.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index fba609ada0e6..639dfbea3348 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -988,6 +988,12 @@ static int sys_addr_to_csrow(struct mem_ctl_info *mci, u64 sys_addr)
 	return csrow;
 }
 
+/*
+ * Glossary of acronyms used in address translation for Zen-based systems
+ *
+ * DF          =       Data Fabric
+ */
+
 /* Protect the PCI config register pairs used for DF indirect access. */
 static DEFINE_MUTEX(df_indirect_mutex);
 
@@ -1058,6 +1064,14 @@ struct addr_ctx {
 	u8 inst_id;
 };
 
+struct data_fabric_ops {
+};
+
+struct data_fabric_ops df2_ops = {
+};
+
+struct data_fabric_ops *df_ops;
+
 static 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;
@@ -1072,6 +1086,11 @@ static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr
 
 	struct addr_ctx ctx;
 
+	if (!df_ops) {
+		pr_debug("Data Fabric Operations not set");
+		return -EINVAL;
+	}
+
 	memset(&ctx, 0, sizeof(ctx));
 
 	/* Start from the normalized address */
@@ -3958,6 +3977,7 @@ static struct amd64_family_type *per_family_init(struct amd64_pvt *pvt)
 		if (pvt->model >= 0x10 && pvt->model <= 0x2f) {
 			fam_type = &family_types[F17_M10H_CPUS];
 			pvt->ops = &family_types[F17_M10H_CPUS].ops;
+			df_ops	 = &df2_ops;
 			break;
 		} else if (pvt->model >= 0x30 && pvt->model <= 0x3f) {
 			fam_type = &family_types[F17_M30H_CPUS];
@@ -3976,6 +3996,7 @@ static struct amd64_family_type *per_family_init(struct amd64_pvt *pvt)
 	case 0x18:
 		fam_type	= &family_types[F17_CPUS];
 		pvt->ops	= &family_types[F17_CPUS].ops;
+		df_ops		= &df2_ops;
 
 		if (pvt->fam == 0x18)
 			family_types[F17_CPUS].ctl_name = "F18h";
-- 
2.25.1