diff options
Diffstat (limited to 'drivers/ras/amd/atl/access.c')
| -rw-r--r-- | drivers/ras/amd/atl/access.c | 27 |
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; |