On Sun, 3 Apr 2022 22:59:53 +0800
Gavin Shan <gs...@redhat.com> wrote:
> When the PPTT table is built, the CPU topology is re-calculated, but
> it's unecessary because the CPU topology has been populated in
> virt_possible_cpu_arch_ids() on arm/virt machine.
>
> This reworks build_pptt() to avoid by reusing the existing one in
> ms->possible_cpus. Currently, the only user of build_pptt() is
> arm/virt machine.
>
> Signed-off-by: Gavin Shan <gs...@redhat.com>
Hi Gavin,
My compiler isn't being very smart today and gives a bunch of
maybe used uninitialized for socket_offset, cluster_offset and core_offset.
They probably are initialized in all real paths, but I think you need to
set them to something at instantiation to keep the compiler happy.
Thanks,
Jonathan
> ---
> hw/acpi/aml-build.c | 100 +++++++++++++++++---------------------------
> 1 file changed, 38 insertions(+), 62 deletions(-)
>
> diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> index 4086879ebf..4b0f9df3e3 100644
> --- a/hw/acpi/aml-build.c
> +++ b/hw/acpi/aml-build.c
> @@ -2002,86 +2002,62 @@ void build_pptt(GArray *table_data, BIOSLinker
> *linker, MachineState *ms,
> const char *oem_id, const char *oem_table_id)
> {
> MachineClass *mc = MACHINE_GET_CLASS(ms);
> - GQueue *list = g_queue_new();
> - guint pptt_start = table_data->len;
> - guint parent_offset;
> - guint length, i;
> - int uid = 0;
> - int socket;
> + CPUArchIdList *cpus = ms->possible_cpus;
> + int64_t socket_id = -1, cluster_id = -1, core_id = -1;
> + uint32_t socket_offset, cluster_offset, core_offset;
> + uint32_t pptt_start = table_data->len;
> + int n;
> AcpiTable table = { .sig = "PPTT", .rev = 2,
> .oem_id = oem_id, .oem_table_id = oem_table_id };
>
> acpi_table_begin(&table, table_data);
>
> - for (socket = 0; socket < ms->smp.sockets; socket++) {
> - g_queue_push_tail(list,
> - GUINT_TO_POINTER(table_data->len - pptt_start));
> - build_processor_hierarchy_node(
> - table_data,
> - /*
> - * Physical package - represents the boundary
> - * of a physical package
> - */
> - (1 << 0),
> - 0, socket, NULL, 0);
> - }
> + for (n = 0; n < cpus->len; n++) {
> + if (cpus->cpus[n].props.socket_id != socket_id) {
> + socket_id = cpus->cpus[n].props.socket_id;
> + cluster_id = -1;
> + core_id = -1;
> + socket_offset = table_data->len - pptt_start;
> + build_processor_hierarchy_node(table_data,
> + (1 << 0), /* Physical package */
> + 0, socket_id, NULL, 0);
> + }
>
> - if (mc->smp_props.clusters_supported) {
> - length = g_queue_get_length(list);
> - for (i = 0; i < length; i++) {
> - int cluster;
> -
> - parent_offset = GPOINTER_TO_UINT(g_queue_pop_head(list));
> - for (cluster = 0; cluster < ms->smp.clusters; cluster++) {
> - g_queue_push_tail(list,
> - GUINT_TO_POINTER(table_data->len - pptt_start));
> - build_processor_hierarchy_node(
> - table_data,
> - (0 << 0), /* not a physical package */
> - parent_offset, cluster, NULL, 0);
> + if (mc->smp_props.clusters_supported) {
> + if (cpus->cpus[n].props.cluster_id != cluster_id) {
> + cluster_id = cpus->cpus[n].props.cluster_id;
> + core_id = -1;
> + cluster_offset = table_data->len - pptt_start;
> + build_processor_hierarchy_node(table_data,
> + (0 << 0), /* Not a physical package */
> + socket_offset, cluster_id, NULL, 0);
> }
> + } else {
> + cluster_offset = socket_offset;
> }
> - }
>
> - length = g_queue_get_length(list);
> - for (i = 0; i < length; i++) {
> - int core;
> -
> - parent_offset = GPOINTER_TO_UINT(g_queue_pop_head(list));
> - for (core = 0; core < ms->smp.cores; core++) {
> - if (ms->smp.threads > 1) {
> - g_queue_push_tail(list,
> - GUINT_TO_POINTER(table_data->len - pptt_start));
> - build_processor_hierarchy_node(
> - table_data,
> + if (ms->smp.threads <= 1) {
> + build_processor_hierarchy_node(table_data,
> + (1 << 1) | /* ACPI Processor ID valid */
> + (1 << 3), /* Node is a Leaf */
> + cluster_offset, n, NULL, 0);
> + } else {
> + if (cpus->cpus[n].props.core_id != core_id) {
> + 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 */
> - parent_offset, core, NULL, 0);
> - } else {
> - build_processor_hierarchy_node(
> - table_data,
> - (1 << 1) | /* ACPI Processor ID valid */
> - (1 << 3), /* Node is a Leaf */
> - parent_offset, uid++, NULL, 0);
> + cluster_offset, core_id, NULL, 0);
> }
> - }
> - }
> -
> - length = g_queue_get_length(list);
> - for (i = 0; i < length; i++) {
> - int thread;
>
> - parent_offset = GPOINTER_TO_UINT(g_queue_pop_head(list));
> - for (thread = 0; thread < ms->smp.threads; thread++) {
> - build_processor_hierarchy_node(
> - table_data,
> + build_processor_hierarchy_node(table_data,
> (1 << 1) | /* ACPI Processor ID valid */
> (1 << 2) | /* Processor is a Thread */
> (1 << 3), /* Node is a Leaf */
> - parent_offset, uid++, NULL, 0);
> + core_offset, n, NULL, 0);
> }
> }
>
> - g_queue_free(list);
> acpi_table_end(linker, &table);
> }
>
