diff mbox series

[2/5] hw/acpi/aml-build: Set identical implementation flag for PPTT processor nodes

Message ID 20240926113323.55991-3-yangyicong@huawei.com (mailing list archive)
State New, archived
Headers show
Series Building PPTT with root node and identical implementation flag | expand

Commit Message

Yicong Yang Sept. 26, 2024, 11:33 a.m. UTC 
From: Yicong Yang <yangyicong@hisilicon.com>

Per ACPI 6.5 Table 5.158: Processor Structure Flags, the identical
implementation flag indicates whether all the children processors
of this node share the same identical implementation revision.
Currently Linux support parsing this field [1] and maybe used to
identify the heterogeneous platform. Since qemu only support
homogeneous emulation, set this flag for all the processor node
to indicates the facts when building the PPTT table. Node leaf
is an exception since spec says this flag should be ignored
on leaf nodes by OSPM.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/acpi/pptt.c?h=v6.11-rc1#n810
Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
---
 hw/acpi/aml-build.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 6d4517cfbe..53a06d8c1e 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -2079,7 +2079,8 @@  void build_pptt(GArray *table_data, BIOSLinker *linker, MachineState *ms,
             core_id = -1;
             socket_offset = table_data->len - pptt_start;
             build_processor_hierarchy_node(table_data,
-                (1 << 0), /* Physical package */
+                (1 << 0) | /* Physical package */
+                (1 << 4), /* Identical Implementation */
                 0, socket_id, NULL, 0);
         }
 
@@ -2090,7 +2091,8 @@  void build_pptt(GArray *table_data, BIOSLinker *linker, MachineState *ms,
                 core_id = -1;
                 cluster_offset = table_data->len - pptt_start;
                 build_processor_hierarchy_node(table_data,
-                    (0 << 0), /* Not a physical package */
+                    (0 << 0) | /* Not a physical package */
+                    (1 << 4), /* Identical Implementation */
                     socket_offset, cluster_id, NULL, 0);
             }
         } else {
@@ -2108,7 +2110,8 @@  void build_pptt(GArray *table_data, BIOSLinker *linker, MachineState *ms,
                 core_id = cpus->cpus[n].props.core_id;
                 core_offset = table_data->len - pptt_start;
                 build_processor_hierarchy_node(table_data,
-                    (0 << 0), /* Not a physical package */
+                    (0 << 0) | /* Not a physical package */
+                    (1 << 4), /* Identical Implementation */
                     cluster_offset, core_id, NULL, 0);
             }