[v2,07/12] hw/riscv/virt-acpi-build.c: Add CMO information in RHCT

Commit Message

Sunil V L Aug. 24, 2023, 2:29 p.m. UTC

When CMO related extensions like Zicboz, Zicbom and Zicbop are enabled, the
block size for those extensions need to be communicated via CMO node in
RHCT. Add CMO node in RHCT if any of those CMO extensions are detected.

Signed-off-by: Sunil V L <[e-mail]>
Reviewed-by: Daniel Henrique Barboza <[e-mail]>
---
 hw/riscv/virt-acpi-build.c | 64 +++++++++++++++++++++++++++++++++-----
 1 file changed, 56 insertions(+), 8 deletions(-)

Patch

diff --git a/hw/riscv/virt-acpi-build.c b/hw/riscv/virt-acpi-build.c
index 8fa358d034..72c2a3e45f 100644
--- a/hw/riscv/virt-acpi-build.c
+++ b/hw/riscv/virt-acpi-build.c
@@ -147,6 +147,7 @@  static void acpi_dsdt_add_cpus(Aml *scope, RISCVVirtState *s)
  * 5.2.36 RISC-V Hart Capabilities Table (RHCT)
  * REF: https://github.com/riscv-non-isa/riscv-acpi/issues/16
  *      https://drive.google.com/file/d/1nP3nFiH4jkPMp6COOxP6123DCZKR-tia/view
+ *      https://drive.google.com/file/d/1sKbOa8m1UZw1JkquZYe3F1zQBN1xXsaf/view
  */
 static void build_rhct(GArray *table_data,
                        BIOSLinker *linker,
@@ -156,8 +157,8 @@  static void build_rhct(GArray *table_data,
     MachineState *ms = MACHINE(s);
     const CPUArchIdList *arch_ids = mc->possible_cpu_arch_ids(ms);
     size_t len, aligned_len;
-    uint32_t isa_offset, num_rhct_nodes;
-    RISCVCPU *cpu;
+    uint32_t isa_offset, num_rhct_nodes, cmo_offset = 0;
+    RISCVCPU *cpu = &s->soc[0].harts[0];
     char *isa;
 
     AcpiTable table = { .sig = "RHCT", .rev = 1, .oem_id = s->oem_id,
@@ -173,6 +174,9 @@  static void build_rhct(GArray *table_data,
 
     /* ISA + N hart info */
     num_rhct_nodes = 1 + ms->smp.cpus;
+    if (cpu->cfg.ext_icbom || cpu->cfg.ext_icboz) {
+        num_rhct_nodes++;
+    }
 
     /* Number of RHCT nodes*/
     build_append_int_noprefix(table_data, num_rhct_nodes, 4);
@@ -184,7 +188,6 @@  static void build_rhct(GArray *table_data,
     isa_offset = table_data->len - table.table_offset;
     build_append_int_noprefix(table_data, 0, 2);   /* Type 0 */
 
-    cpu = &s->soc[0].harts[0];
     isa = riscv_isa_string(cpu);
     len = 8 + strlen(isa) + 1;
     aligned_len = (len % 2) ? (len + 1) : len;
@@ -200,14 +203,59 @@  static void build_rhct(GArray *table_data,
         build_append_int_noprefix(table_data, 0x0, 1);   /* Optional Padding */
     }
 
+    /* CMO node */
+    if (cpu->cfg.ext_icbom || cpu->cfg.ext_icboz) {
+        cmo_offset = table_data->len - table.table_offset;
+        build_append_int_noprefix(table_data, 1, 2);    /* Type */
+        build_append_int_noprefix(table_data, 10, 2);   /* Total Length */
+        build_append_int_noprefix(table_data, 0x1, 2);  /* Revision */
+        build_append_int_noprefix(table_data, 0, 1);    /* Reserved */
+
+        /* CBOM block size */
+        if (cpu->cfg.cbom_blocksize) {
+            build_append_int_noprefix(table_data,
+                                      __builtin_ctz(cpu->cfg.cbom_blocksize),
+                                      1);
+        } else {
+            build_append_int_noprefix(table_data, 0, 1);
+        }
+
+        /* CBOP block size */
+        build_append_int_noprefix(table_data, 0, 1);
+
+        /* CBOZ block size */
+        if (cpu->cfg.cboz_blocksize) {
+            build_append_int_noprefix(table_data,
+                                      __builtin_ctz(cpu->cfg.cboz_blocksize),
+                                      1);
+        } else {
+            build_append_int_noprefix(table_data, 0, 1);
+        }
+    }
+
     /* Hart Info Node */
     for (int i = 0; i < arch_ids->len; i++) {
+        len = 16;
+        int num_offsets = 1;
         build_append_int_noprefix(table_data, 0xFFFF, 2);  /* Type */
-        build_append_int_noprefix(table_data, 16, 2);      /* Length */
-        build_append_int_noprefix(table_data, 0x1, 2);     /* Revision */
-        build_append_int_noprefix(table_data, 1, 2);    /* Number of offsets */
-        build_append_int_noprefix(table_data, i, 4);    /* ACPI Processor UID */
-        build_append_int_noprefix(table_data, isa_offset, 4); /* Offsets[0] */
+
+        /* Length */
+        if (cmo_offset) {
+            len += 4;
+            num_offsets++;
+        }
+
+        build_append_int_noprefix(table_data, len, 2);
+        build_append_int_noprefix(table_data, 0x1, 2); /* Revision */
+        /* Number of offsets */
+        build_append_int_noprefix(table_data, num_offsets, 2);
+        build_append_int_noprefix(table_data, i, 4);   /* ACPI Processor UID */
+
+        /* Offsets */
+        build_append_int_noprefix(table_data, isa_offset, 4);
+        if (cmo_offset) {
+            build_append_int_noprefix(table_data, cmo_offset, 4);
+        }
     }
 
     acpi_table_end(linker, &table);