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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Oct 2024 17:22:18.4386 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5603867b-a407-4376-b84d-08dcf3873f20 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BL6PEPF0001AB4C.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7659 Content-Type: text/plain; charset="utf-8" Cache the root devices locally so that there are no more dependencies on AMD_NB. Signed-off-by: Yazen Ghannam --- arch/x86/kernel/amd_smn.c | 42 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 39 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/amd_smn.c b/arch/x86/kernel/amd_smn.c index e53db07d1a77..45cf86cd9014 100644 --- a/arch/x86/kernel/amd_smn.c +++ b/arch/x86/kernel/amd_smn.c @@ -8,9 +8,10 @@ =20 #include =20 -#include #include =20 +static struct pci_dev **amd_roots; + /* Protect the PCI config register pairs used for SMN. */ static DEFINE_MUTEX(smn_mutex); =20 @@ -56,10 +57,10 @@ static int __amd_smn_rw(u16 node, u32 address, u32 *val= ue, bool write) struct pci_dev *root; int err =3D -ENODEV; =20 - if (node >=3D amd_nb_num()) + if (node >=3D amd_num_nodes()) return err; =20 - root =3D node_to_amd_nb(node)->root; + root =3D amd_roots[node]; if (!root) return err; =20 @@ -95,3 +96,38 @@ int __must_check amd_smn_write(u16 node, u32 address, u3= 2 value) return __amd_smn_rw(node, address, &value, true); } EXPORT_SYMBOL_GPL(amd_smn_write); + +static int amd_cache_roots(void) +{ + u16 node, num_nodes =3D amd_num_nodes(); + + amd_roots =3D kcalloc(num_nodes, sizeof(struct pci_dev *), GFP_KERNEL); + if (!amd_roots) + return -ENOMEM; + + for (node =3D 0; node < num_nodes; node++) + amd_roots[node] =3D amd_node_get_root(node); + + return 0; +} + +static int __init amd_smn_init(void) +{ + int err; + + if (!cpu_feature_enabled(X86_FEATURE_ZEN)) + return 0; + + guard(mutex)(&smn_mutex); + + if (amd_roots) + return 0; + + err =3D amd_cache_roots(); + if (err) + return err; + + return 0; +} + +fs_initcall(amd_smn_init); --=20 2.43.0