RAS/AMD/ATL: Add MI300 support

AMD MI300 systems include on-die HBM3 memory and a unique topology. And
they fall under Data Fabric version 4.5 in overall design.

Generally, topology information (IDs, etc.) is gathered from Data Fabric
registers. However, the unique topology for MI300 means that some
topology information is fixed in hardware and follows arbitrary
mappings. Furthermore, not all hardware instances are software-visible,
so register accesses must be adjusted.

Recognize and add helper functions for the new MI300 interleave modes.
Add lookup tables for fixed values where appropriate. Adjust how Die and
Node IDs are found and used.

Also, fix some register bitmasks that were mislabeled.

Signed-off-by: Muralidhara M K <muralidhara.mk@amd.com>
Co-developed-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20240128155950.1434067-1-yazen.ghannam@amd.com

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/ras/amd/atl/access.c b/drivers/ras/amd/atl/access.c
index f6dd87bb2c35..ee4661ed28ba 100644
--- a/drivers/ras/amd/atl/access.c
+++ b/drivers/ras/amd/atl/access.c
@@ -36,6 +36,32 @@ static DEFINE_MUTEX(df_indirect_mutex);
 
 #define DF_FICAA_REG_NUM_LEGACY	GENMASK(10, 2)
 
+static u16 get_accessible_node(u16 node)
+{
+	/*
+	 * On heterogeneous systems, not all AMD Nodes are accessible
+	 * through software-visible registers. The Node ID needs to be
+	 * adjusted for register accesses. But its value should not be
+	 * changed for the translation methods.
+	 */
+	if (df_cfg.flags.heterogeneous) {
+		/* Only Node 0 is accessible on DF3.5 systems. */
+		if (df_cfg.rev == DF3p5)
+			node = 0;
+
+		/*
+		 * Only the first Node in each Socket is accessible on
+		 * DF4.5 systems, and this is visible to software as one
+		 * Fabric per Socket.  The Socket ID can be derived from
+		 * the Node ID and global shift values.
+		 */
+		if (df_cfg.rev == DF4p5)
+			node >>= df_cfg.socket_id_shift - df_cfg.node_id_shift;
+	}
+
+	return node;
+}
+
 static int __df_indirect_read(u16 node, u8 func, u16 reg, u8 instance_id, u32 *lo)
 {
 	u32 ficaa_addr = 0x8C, ficad_addr = 0xB8;
@@ -43,6 +69,7 @@ static int __df_indirect_read(u16 node, u8 func, u16 reg, u8 instance_id, u32 *l
 	int err = -ENODEV;
 	u32 ficaa = 0;
 
+	node = get_accessible_node(node);
 	if (node >= amd_nb_num())
 		goto out;