On Sun, 13 Jul 2025 17:15:02 -0400
"Michael S. Tsirkin" <m...@redhat.com> wrote:
> On Mon, Jul 07, 2025 at 01:19:06PM +0100, Alireza Sanaee wrote:
> > Add cache topology to PPTT table. With this patch, both ACPI PPTT
> > table and device tree will represent the same cache topology given
> > users input.
> >
> > Co-developed-by: Jonathan Cameron <jonathan.came...@huawei.com>
> > Signed-off-by: Alireza Sanaee <alireza.san...@huawei.com>
> > ---
> > hw/acpi/aml-build.c | 248
> > +++++++++++++++++++++++++++++++-- hw/arm/virt-acpi-build.c |
> > 8 +- hw/loongarch/virt-acpi-build.c | 2 +-
> > include/hw/acpi/aml-build.h | 4 +-
> > 4 files changed, 249 insertions(+), 13 deletions(-)
> >
> > diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
> > index f8f93a9f66..474f3035cb 100644
> > --- a/hw/acpi/aml-build.c
> > +++ b/hw/acpi/aml-build.c
> > @@ -31,6 +31,8 @@
> > #include "hw/pci/pci_bus.h"
> > #include "hw/pci/pci_bridge.h"
> > #include "qemu/cutils.h"
> > +#include "hw/acpi/cpu.h"
> > +#include "hw/core/cpu.h"
> >
> > static GArray *build_alloc_array(void)
> > {
> > @@ -2141,24 +2143,161 @@ void build_spcr(GArray *table_data,
> > BIOSLinker *linker, }
> > acpi_table_end(linker, &table);
> > }
> > +
> > +static void build_cache_nodes(GArray *tbl, CPUCorePPTTCaches
> > *cache,
> > + uint32_t next_offset, unsigned int
> > id) +{
> > + int val;
> > +
> > + /* Type 1 - cache */
> > + build_append_byte(tbl, 1);
> > + /* Length */
> > + build_append_byte(tbl, 28);
> > + /* Reserved */
> > + build_append_int_noprefix(tbl, 0, 2);
> > + /* Flags - everything except possibly the ID */
> > + build_append_int_noprefix(tbl, 0xff, 4);
> > + /* Offset of next cache up */
> > + build_append_int_noprefix(tbl, next_offset, 4);
> > + build_append_int_noprefix(tbl, cache->size, 4);
> > + build_append_int_noprefix(tbl, cache->sets, 4);
> > + build_append_byte(tbl, cache->associativity);
> > + val = 0x3;
> > + switch (cache->type) {
> > + case INSTRUCTION_CACHE:
> > + val |= (1 << 2);
> > + break;
> > + case DATA_CACHE:
> > + val |= (0 << 2); /* Data */
> > + break;
> > + case UNIFIED_CACHE:
> > + val |= (3 << 2); /* Unified */
> > + break;
> > + }
> > + build_append_byte(tbl, val);
> > + build_append_int_noprefix(tbl, cache->linesize, 2);
> > + build_append_int_noprefix(tbl,
> > + (cache->type << 24) | (cache->level
> > << 16) | id,
> > + 4);
> > +}
> > +
> > +/*
> > + * builds caches from the top level (`level_high` parameter) to
> > the bottom
> > + * level (`level_low` parameter). It searches for caches found in
> > + * systems' registers, and fills up the table. Then it updates the
> > + * `data_offset` and `instr_offset` parameters with the offset of
> > the data
> > + * and instruction caches of the lowest level, respectively.
> > + */
> > +static bool build_caches(GArray *table_data, uint32_t pptt_start,
> > + int num_caches, CPUCorePPTTCaches *caches,
> > + int base_id,
> > + uint8_t level_high, /* Inclusive */
> > + uint8_t level_low, /* Inclusive */
> > + uint32_t *data_offset,
> > + uint32_t *instr_offset)
> > +{
> > + uint32_t next_level_offset_data = 0,
> > next_level_offset_instruction = 0;
> > + uint32_t this_offset, next_offset = 0;
> > + int c, level;
> > + bool found_cache = false;
> > +
> > + /* Walk caches from top to bottom */
> > + for (level = level_high; level >= level_low; level--) {
> > + for (c = 0; c < num_caches; c++) {
> > + if (caches[c].level != level) {
> > + continue;
> > + }
> > +
> > + /* Assume only unified above l1 for now */
> > + this_offset = table_data->len - pptt_start;
> > + switch (caches[c].type) {
> > + case INSTRUCTION_CACHE:
> > + next_offset = next_level_offset_instruction;
> > + break;
> > + case DATA_CACHE:
> > + next_offset = next_level_offset_data;
> > + break;
> > + case UNIFIED_CACHE:
> > + /* Either is fine here */
> > + next_offset = next_level_offset_instruction;
> > + break;
> > + }
> > + build_cache_nodes(table_data, &caches[c], next_offset,
> > base_id);
> > + switch (caches[c].type) {
> > + case INSTRUCTION_CACHE:
> > + next_level_offset_instruction = this_offset;
> > + break;
> > + case DATA_CACHE:
> > + next_level_offset_data = this_offset;
> > + break;
> > + case UNIFIED_CACHE:
> > + next_level_offset_instruction = this_offset;
> > + next_level_offset_data = this_offset;
> > + break;
> > + }
> > + *data_offset = next_level_offset_data;
> > + *instr_offset = next_level_offset_instruction;
> > +
> > + found_cache = true;
> > + }
> > + }
> > +
> > + return found_cache;
> > +}
> > +
> > /*
> > * ACPI spec, Revision 6.3
> > * 5.2.29 Processor Properties Topology Table (PPTT)
> > */
> > void build_pptt(GArray *table_data, BIOSLinker *linker,
> > MachineState *ms,
> > - const char *oem_id, const char *oem_table_id)
> > + const char *oem_id, const char *oem_table_id,
> > + int num_caches, CPUCorePPTTCaches *caches)
> > {
> > MachineClass *mc = MACHINE_GET_CLASS(ms);
> > CPUArchIdList *cpus = ms->possible_cpus;
> > - int64_t socket_id = -1, cluster_id = -1, core_id = -1;
> > - uint32_t socket_offset = 0, cluster_offset = 0, core_offset =
> > 0;
> > + uint32_t core_data_offset = 0;
> > + uint32_t core_instr_offset = 0;
> > + uint32_t cluster_instr_offset = 0;
> > + uint32_t cluster_data_offset = 0;
> > + uint32_t node_data_offset = 0;
> > + uint32_t node_instr_offset = 0;
> > + int top_node = 3;
> > + int top_cluster = 3;
> > + int top_core = 3;
> > + int bottom_node = 3;
> > + int bottom_cluster = 3;
> > + int bottom_core = 3;
> > + int64_t socket_id = -1;
> > + int64_t cluster_id = -1;
> > + int64_t core_id = -1;
> > + uint32_t socket_offset = 0;
> > + uint32_t cluster_offset = 0;
> > + uint32_t core_offset = 0;
> > uint32_t pptt_start = table_data->len;
> > + uint32_t root_offset;
> > int n;
> > + uint32_t priv_rsrc[2];
> > + uint32_t num_priv = 0;
> > + bool cache_available;
> > + bool llevel;
> > +
> > AcpiTable table = { .sig = "PPTT", .rev = 2,
> > .oem_id = oem_id, .oem_table_id =
> > oem_table_id };
> > acpi_table_begin(&table, table_data);
> >
> > + /*
> > + * Build a root node for all the processor nodes. Otherwise
> > when
>
> This appears to use parts of
> Message-Id: <20250604115233.1234-4-alireza.san...@huawei.com>
>
> which is:
>
> hw/acpi/aml-build: Build a root node in the PPTT table
>
Hi Michael,
I put a note on cover letter regarding the dependency.
But I made a mistake preparing this patchset anyway. Will fix.
>
> but this time, without attribution, without documenting the change
> in the commit log, and with worse grammar. What gives?
>
>
> > + * building a multi-socket system each socket tree are
> > separated
>
> is separated
I think I know why this is still there, cuz I have fixed this error on
the other patchset as this comes from the other patchset.
Will send a new version...
>
> > + * and will be hard for the OS like Linux to know whether the
> > + * system is homogeneous.
> > + */
> > + root_offset = table_data->len - pptt_start;
> > + build_processor_hierarchy_node(table_data,
> > + (1 << 0) | /* Physical panodeckage */
> > + (1 << 4), /* Identical Implementation */
> > + 0, 0, NULL, 0);
> > +
> > /*
> > * This works with the assumption that cpus[n].props.*_id has
> > been
> > * sorted from top to down levels in
> > mc->possible_cpu_arch_ids(). @@ -2171,10 +2310,36 @@ void
> > build_pptt(GArray *table_data, BIOSLinker *linker, MachineState
> > *ms, socket_id = cpus->cpus[n].props.socket_id; cluster_id = -1;
> > core_id = -1;
> > + bottom_node = top_node;
> > + num_priv = 0;
> > + cache_available =
> > + machine_defines_cache_at_topo_level(ms,
> > +
> > CPU_TOPOLOGY_LEVEL_SOCKET);
> > + llevel =
> > machine_find_lowest_level_cache_at_topo_level(ms,
> > + &bottom_node,
> > + CPU_TOPOLOGY_LEVEL_SOCKET);
> > + if (cache_available && llevel) {
> > + build_caches(table_data, pptt_start,
> > + num_caches, caches,
> > + n, top_node, bottom_node,
> > + &node_data_offset,
> > &node_instr_offset); +
> > + priv_rsrc[0] = node_instr_offset;
> > + priv_rsrc[1] = node_data_offset;
> > +
> > + if (node_instr_offset || node_data_offset) {
> > + num_priv = node_instr_offset ==
> > node_data_offset ? 1 : 2;
> > + }
> > +
> > + top_cluster = bottom_node - 1;
> > + }
> > +
> > socket_offset = table_data->len - pptt_start;
> > build_processor_hierarchy_node(table_data,
> > - (1 << 0), /* Physical package */
> > - 0, socket_id, NULL, 0);
> > + (1 << 0) | /* Physical package */
> > + (1 << 4), /* Identical Implementation */
> > + root_offset, socket_id,
> > + priv_rsrc, num_priv);
> > }
> >
> > if (mc->smp_props.clusters_supported &&
> > mc->smp_props.has_clusters) { @@ -2182,28 +2347,91 @@ void
> > build_pptt(GArray *table_data, BIOSLinker *linker, MachineState
> > *ms, assert(cpus->cpus[n].props.cluster_id > cluster_id);
> > cluster_id = cpus->cpus[n].props.cluster_id; core_id = -1;
> > + bottom_cluster = top_cluster;
> > + num_priv = 0;
> > + cache_available =
> > + machine_defines_cache_at_topo_level(ms,
> > + CPU_TOPOLOGY_LEVEL_CLUSTER);
> > + llevel =
> > machine_find_lowest_level_cache_at_topo_level(ms,
> > + &bottom_cluster,
> > + CPU_TOPOLOGY_LEVEL_CLUSTER);
> > +
> > + if (cache_available && llevel) {
> > +
> > + build_caches(table_data, pptt_start,
> > + num_caches, caches, n,
> > top_cluster,
> > + bottom_cluster,
> > &cluster_data_offset,
> > + &cluster_instr_offset);
> > +
> > + priv_rsrc[0] = cluster_instr_offset;
> > + priv_rsrc[1] = cluster_data_offset;
> > +
> > + if (cluster_instr_offset ||
> > cluster_data_offset) {
> > + num_priv =
> > + cluster_instr_offset ==
> > cluster_data_offset ? 1 : 2;
> > + }
> > +
> > + top_core = bottom_cluster - 1;
> > + } else if (top_cluster == bottom_node - 1) {
> > + /* socket cache but no cluster cache */
> > + top_core = bottom_node - 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);
> > + (0 << 0) | /* Not a physical package */
> > + (1 << 4), /* Identical Implementation */
> > + socket_offset, cluster_id,
> > + priv_rsrc, num_priv);
> > }
> > } else {
> > + if (machine_defines_cache_at_topo_level(ms,
> > + CPU_TOPOLOGY_LEVEL_CLUSTER)) {
> > + error_setg(&error_fatal, "Not clusters found for
> > the cache");
> > + return;
> > + }
> > +
> > cluster_offset = socket_offset;
> > + top_core = bottom_node - 1; /* there is no cluster */
> > + }
> > +
> > + if (cpus->cpus[n].props.core_id != core_id) {
> > + bottom_core = top_core;
> > + num_priv = 0;
> > + cache_available =
> > + machine_defines_cache_at_topo_level(ms,
> > CPU_TOPOLOGY_LEVEL_CORE);
> > + llevel =
> > machine_find_lowest_level_cache_at_topo_level(ms,
> > + &bottom_core, CPU_TOPOLOGY_LEVEL_CORE);
> > +
> > + if (cache_available && llevel) {
> > + build_caches(table_data, pptt_start,
> > + num_caches, caches,
> > + n, top_core, bottom_core,
> > + &core_data_offset,
> > &core_instr_offset); +
> > + priv_rsrc[0] = core_instr_offset;
> > + priv_rsrc[1] = core_data_offset;
> > +
> > + num_priv = core_instr_offset == core_data_offset ?
> > 1 : 2;
> > + }
> > }
> >
> > 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);
> > + cluster_offset, n,
> > + priv_rsrc, num_priv);
> > } else {
> > if (cpus->cpus[n].props.core_id != core_id) {
> > assert(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 */
> > - cluster_offset, core_id, NULL, 0);
> > + (0 << 0) | /* Not a physical package */
> > + (1 << 4), /* Identical Implementation */
> > + cluster_offset, core_id,
> > + priv_rsrc, num_priv);
> > }
> >
> > build_processor_hierarchy_node(table_data,
> > diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
> > index cd90c47976..a9b5aeac49 100644
> > --- a/hw/arm/virt-acpi-build.c
> > +++ b/hw/arm/virt-acpi-build.c
> > @@ -962,6 +962,11 @@ void virt_acpi_build(VirtMachineState *vms,
> > AcpiBuildTables *tables) GArray *tables_blob = tables->table_data;
> > MachineState *ms = MACHINE(vms);
> >
> > + CPUCorePPTTCaches caches[CPU_MAX_CACHES];
> > + unsigned int num_caches;
> > +
> > + num_caches = virt_get_caches(vms, caches);
> > +
> > table_offsets = g_array_new(false, true /* clear */,
> > sizeof(uint32_t));
> >
> > @@ -983,7 +988,8 @@ void virt_acpi_build(VirtMachineState *vms,
> > AcpiBuildTables *tables) if (!vmc->no_cpu_topology) {
> > acpi_add_table(table_offsets, tables_blob);
> > build_pptt(tables_blob, tables->linker, ms,
> > - vms->oem_id, vms->oem_table_id);
> > + vms->oem_id, vms->oem_table_id,
> > + num_caches, caches);
> > }
> >
> > acpi_add_table(table_offsets, tables_blob);
> > diff --git a/hw/loongarch/virt-acpi-build.c
> > b/hw/loongarch/virt-acpi-build.c index 2cd2d9d842..dd34a520c7 100644
> > --- a/hw/loongarch/virt-acpi-build.c
> > +++ b/hw/loongarch/virt-acpi-build.c
> > @@ -552,7 +552,7 @@ static void acpi_build(AcpiBuildTables *tables,
> > MachineState *machine)
> > acpi_add_table(table_offsets, tables_blob);
> > build_pptt(tables_blob, tables->linker, machine,
> > - lvms->oem_id, lvms->oem_table_id);
> > + lvms->oem_id, lvms->oem_table_id, 0, NULL);
> >
> > acpi_add_table(table_offsets, tables_blob);
> > build_srat(tables_blob, tables->linker, machine);
> > diff --git a/include/hw/acpi/aml-build.h
> > b/include/hw/acpi/aml-build.h index 6fa2e1eedf..3429cdae71 100644
> > --- a/include/hw/acpi/aml-build.h
> > +++ b/include/hw/acpi/aml-build.h
> > @@ -3,6 +3,7 @@
> >
> > #include "hw/acpi/acpi-defs.h"
> > #include "hw/acpi/bios-linker-loader.h"
> > +#include "hw/cpu/core.h"
> >
> > #define ACPI_BUILD_APPNAME6 "BOCHS "
> > #define ACPI_BUILD_APPNAME8 "BXPC "
> > @@ -499,7 +500,8 @@ void build_slit(GArray *table_data, BIOSLinker
> > *linker, MachineState *ms, typedef struct CPUPPTTCaches
> > CPUCorePPTTCaches;
> > void build_pptt(GArray *table_data, BIOSLinker *linker,
> > MachineState *ms,
> > - const char *oem_id, const char *oem_table_id);
> > + const char *oem_id, const char *oem_table_id,
> > + int num_caches, CPUCorePPTTCaches *caches);
> >
> > void build_fadt(GArray *tbl, BIOSLinker *linker, const
> > AcpiFadtData *f, const char *oem_id, const char *oem_table_id);
> > --
> > 2.43.0
>
>
