[PATCH v10 1/7] RAS/AMD/ATL: Make PRM address translation support builtin

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

PRM (Platform Runtime Mechanism) is the only address translation method
for current and future AMD systems. The library should therefore always
include it.

The PRM helpers in <linux/prmt.h> already provide stubs that return an
error when CONFIG_ACPI_PRMT is disabled. Make prm.c builtin. The library
then falls back to native translation at runtime when no PRM handler is
available.

Assisted-by: LLM
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
---
 drivers/ras/amd/atl/Kconfig    | 4 ----
 drivers/ras/amd/atl/Makefile   | 3 +--
 drivers/ras/amd/atl/internal.h | 8 --------
 drivers/ras/amd/atl/prm.c      | 2 +-
 4 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/drivers/ras/amd/atl/Kconfig b/drivers/ras/amd/atl/Kconfig
index 44c2fd7febc5..29befaf2a1e2 100644
--- a/drivers/ras/amd/atl/Kconfig
+++ b/drivers/ras/amd/atl/Kconfig
@@ -19,7 +19,3 @@ config AMD_ATL
 
 	  Enable this option if using DRAM ECC on Zen-based systems
 	  and OS-based error handling.
-
-config AMD_ATL_PRM
-	depends on AMD_ATL && ACPI_PRMT
-	def_bool y
diff --git a/drivers/ras/amd/atl/Makefile b/drivers/ras/amd/atl/Makefile
index b56892c0c0d9..ff52452b678f 100644
--- a/drivers/ras/amd/atl/Makefile
+++ b/drivers/ras/amd/atl/Makefile
@@ -12,9 +12,8 @@ amd_atl-y		+= core.o
 amd_atl-y		+= dehash.o
 amd_atl-y		+= denormalize.o
 amd_atl-y		+= map.o
+amd_atl-y		+= prm.o
 amd_atl-y		+= system.o
 amd_atl-y		+= umc.o
 
-amd_atl-$(CONFIG_AMD_ATL_PRM) += prm.o
-
 obj-$(CONFIG_AMD_ATL)	+= amd_atl.o
diff --git a/drivers/ras/amd/atl/internal.h b/drivers/ras/amd/atl/internal.h
index 82a56d9c2be1..4fc4bc3c3500 100644
--- a/drivers/ras/amd/atl/internal.h
+++ b/drivers/ras/amd/atl/internal.h
@@ -287,15 +287,7 @@ u64 remove_base_and_hole(struct addr_ctx *ctx, u64 addr);
 /* GUIDs for PRM handlers */
 extern const guid_t norm_to_sys_guid;
 
-#ifdef CONFIG_AMD_ATL_PRM
 unsigned long prm_umc_norm_to_sys_addr(u8 socket_id, u64 umc_bank_inst_id, unsigned long addr);
-#else
-static inline unsigned long prm_umc_norm_to_sys_addr(u8 socket_id, u64 umc_bank_inst_id,
-						     unsigned long addr)
-{
-       return -ENODEV;
-}
-#endif
 
 /*
  * Make a gap in @data that is @num_bits long starting at @bit_num.
diff --git a/drivers/ras/amd/atl/prm.c b/drivers/ras/amd/atl/prm.c
index 0f9bfa96e16a..eba9d104d09e 100644
--- a/drivers/ras/amd/atl/prm.c
+++ b/drivers/ras/amd/atl/prm.c
@@ -44,7 +44,7 @@ unsigned long prm_umc_norm_to_sys_addr(u8 socket_id, u64 bank_id, unsigned long
 	if (!ret)
 		return ret_addr;
 
-	if (ret == -ENODEV)
+	if (ret == -ENODEV || ret == -EOPNOTSUPP)
 		pr_debug("PRM module/handler not available\n");
 	else
 		pr_notice_once("PRM address translation failed\n");
-- 
2.43.0