[PATCH v2 06/31] EDAC/amd64: Define Data Fabric operations

[Yazen Ghannam <yazen.ghannam@amd.com>]

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

Define a function to set the appropriate operations. Use a return code
because future updates have checks that may fail.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
Link:
https://lkml.kernel.org/r/20210507190140.18854-3-Yazen.Ghannam@amd.com

v1->v2:
* New in v2.

 drivers/edac/amd64_edac.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
index 62eca188458f..f769353ef7e4 100644
--- a/drivers/edac/amd64_edac.c
+++ b/drivers/edac/amd64_edac.c
@@ -1085,6 +1085,21 @@ struct addr_ctx {
 	u8 inst_id;
 };
 
+struct data_fabric_ops {
+};
+
+struct data_fabric_ops df2_ops = {
+};
+
+struct data_fabric_ops *df_ops;
+
+static int set_df_ops(struct addr_ctx *ctx)
+{
+	df_ops = &df2_ops;
+
+	return 0;
+}
+
 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;
@@ -1110,6 +1125,9 @@ static int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr
 	ctx.nid = nid;
 	ctx.inst_id = umc;
 
+	if (set_df_ops(&ctx))
+		return -EINVAL;
+
 	if (amd_df_indirect_read(nid, df_regs[DRAM_OFFSET], umc, &tmp))
 		goto out_err;
 
-- 
2.25.1