RAS/AMD/ATL: Read DRAM hole base early

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

Signed-off-by: John Allen <[e-mail]>
Signed-off-by: Borislav Petkov (AMD) <[e-mail]>
Reviewed-by: Yazen Ghannam <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/ras/amd/atl/core.c

···
 
 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;
 }
···
 	ctx.inputs.socket_id = socket_id;
 	ctx.inputs.die_id = die_id;
 	ctx.inputs.coh_st_inst_id = coh_st_inst_id;
+
+	if (legacy_hole_en(&ctx) && !df_cfg.dram_hole_base)
+		return -EINVAL;
 
 	if (determine_node_id(&ctx, socket_id, die_id))
 		return -EINVAL;

drivers/ras/amd/atl/internal.h

···
 	/* 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;
 };

drivers/ras/amd/atl/system.c

···
 	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) {
···
 
 	pr_debug("num_coh_st_maps=%u",			df_cfg.num_coh_st_maps);
 
+	pr_debug("dram_hole_base=0x%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);
 }
···
 	apply_node_id_shift();
 
 	get_num_maps();
+
+	if (get_dram_hole_base())
+		pr_warn("Failed to read DRAM hole base");
 
 	dump_df_cfg();