ACPI: Build Hardware Error Source Table

This patch builds Hardware Error Source Table(HEST) via fw_cfg blobs.
Now it only supports ARMv8 SEA, a type of Generic Hardware Error
Source version 2(GHESv2) error source. Afterwards, we can extend
the supported types if needed. For the CPER section, currently it
is memory section because kernel mainly wants userspace to handle
the memory errors.

This patch follows the spec ACPI 6.2 to build the Hardware Error
Source table. For more detailed information, please refer to
document: docs/specs/acpi_hest_ghes.rst

build_ghes_hw_error_notification() helper will help to add Hardware
Error Notification to ACPI tables without using packed C structures
and avoid endianness issues as API doesn't need explicit conversion.

Signed-off-by: Xiang Zheng <zhengxiang9@huawei.com>
Signed-off-by: Dongjiu Geng <gengdongjiu@huawei.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Message-id: 20200512030609.19593-6-gengdongjiu@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

2 files changed, 128 insertions, 0 deletions

diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index e1b3f8f..091fd87 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -23,6 +23,7 @@
 #include "qemu/units.h"
 #include "hw/acpi/ghes.h"
 #include "hw/acpi/aml-build.h"
+#include "qemu/error-report.h"
 
 #define ACPI_GHES_ERRORS_FW_CFG_FILE        "etc/hardware_errors"
 #define ACPI_GHES_DATA_ADDR_FW_CFG_FILE     "etc/hardware_errors_addr"
@@ -33,6 +34,42 @@
 /* Now only support ARMv8 SEA notification type error source */
 #define ACPI_GHES_ERROR_SOURCE_COUNT        1
 
+/* Generic Hardware Error Source version 2 */
+#define ACPI_GHES_SOURCE_GENERIC_ERROR_V2   10
+
+/* Address offset in Generic Address Structure(GAS) */
+#define GAS_ADDR_OFFSET 4
+
+/*
+ * Hardware Error Notification
+ * ACPI 4.0: 17.3.2.7 Hardware Error Notification
+ * Composes dummy Hardware Error Notification descriptor of specified type
+ */
+static void build_ghes_hw_error_notification(GArray *table, const uint8_t type)
+{
+    /* Type */
+    build_append_int_noprefix(table, type, 1);
+    /*
+     * Length:
+     * Total length of the structure in bytes
+     */
+    build_append_int_noprefix(table, 28, 1);
+    /* Configuration Write Enable */
+    build_append_int_noprefix(table, 0, 2);
+    /* Poll Interval */
+    build_append_int_noprefix(table, 0, 4);
+    /* Vector */
+    build_append_int_noprefix(table, 0, 4);
+    /* Switch To Polling Threshold Value */
+    build_append_int_noprefix(table, 0, 4);
+    /* Switch To Polling Threshold Window */
+    build_append_int_noprefix(table, 0, 4);
+    /* Error Threshold Value */
+    build_append_int_noprefix(table, 0, 4);
+    /* Error Threshold Window */
+    build_append_int_noprefix(table, 0, 4);
+}
+
 /*
  * Build table for the hardware error fw_cfg blob.
  * Initialize "etc/hardware_errors" and "etc/hardware_errors_addr" fw_cfg blobs.
@@ -87,3 +124,92 @@ void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker)
     bios_linker_loader_write_pointer(linker, ACPI_GHES_DATA_ADDR_FW_CFG_FILE,
         0, sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE, 0);
 }
+
+/* Build Generic Hardware Error Source version 2 (GHESv2) */
+static void build_ghes_v2(GArray *table_data, int source_id, BIOSLinker *linker)
+{
+    uint64_t address_offset;
+    /*
+     * Type:
+     * Generic Hardware Error Source version 2(GHESv2 - Type 10)
+     */
+    build_append_int_noprefix(table_data, ACPI_GHES_SOURCE_GENERIC_ERROR_V2, 2);
+    /* Source Id */
+    build_append_int_noprefix(table_data, source_id, 2);
+    /* Related Source Id */
+    build_append_int_noprefix(table_data, 0xffff, 2);
+    /* Flags */
+    build_append_int_noprefix(table_data, 0, 1);
+    /* Enabled */
+    build_append_int_noprefix(table_data, 1, 1);
+
+    /* Number of Records To Pre-allocate */
+    build_append_int_noprefix(table_data, 1, 4);
+    /* Max Sections Per Record */
+    build_append_int_noprefix(table_data, 1, 4);
+    /* Max Raw Data Length */
+    build_append_int_noprefix(table_data, ACPI_GHES_MAX_RAW_DATA_LENGTH, 4);
+
+    address_offset = table_data->len;
+    /* Error Status Address */
+    build_append_gas(table_data, AML_AS_SYSTEM_MEMORY, 0x40, 0,
+                     4 /* QWord access */, 0);
+    bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE,
+        address_offset + GAS_ADDR_OFFSET, sizeof(uint64_t),
+        ACPI_GHES_ERRORS_FW_CFG_FILE, source_id * sizeof(uint64_t));
+
+    switch (source_id) {
+    case ACPI_HEST_SRC_ID_SEA:
+        /*
+         * Notification Structure
+         * Now only enable ARMv8 SEA notification type
+         */
+        build_ghes_hw_error_notification(table_data, ACPI_GHES_NOTIFY_SEA);
+        break;
+    default:
+        error_report("Not support this error source");
+        abort();
+    }
+
+    /* Error Status Block Length */
+    build_append_int_noprefix(table_data, ACPI_GHES_MAX_RAW_DATA_LENGTH, 4);
+
+    /*
+     * Read Ack Register
+     * ACPI 6.1: 18.3.2.8 Generic Hardware Error Source
+     * version 2 (GHESv2 - Type 10)
+     */
+    address_offset = table_data->len;
+    build_append_gas(table_data, AML_AS_SYSTEM_MEMORY, 0x40, 0,
+                     4 /* QWord access */, 0);
+    bios_linker_loader_add_pointer(linker, ACPI_BUILD_TABLE_FILE,
+        address_offset + GAS_ADDR_OFFSET,
+        sizeof(uint64_t), ACPI_GHES_ERRORS_FW_CFG_FILE,
+        (ACPI_GHES_ERROR_SOURCE_COUNT + source_id) * sizeof(uint64_t));
+
+    /*
+     * Read Ack Preserve field
+     * We only provide the first bit in Read Ack Register to OSPM to write
+     * while the other bits are preserved.
+     */
+    build_append_int_noprefix(table_data, ~0x1ULL, 8);
+    /* Read Ack Write */
+    build_append_int_noprefix(table_data, 0x1, 8);
+}
+
+/* Build Hardware Error Source Table */
+void acpi_build_hest(GArray *table_data, BIOSLinker *linker)
+{
+    uint64_t hest_start = table_data->len;
+
+    /* Hardware Error Source Table header*/
+    acpi_data_push(table_data, sizeof(AcpiTableHeader));
+
+    /* Error Source Count */
+    build_append_int_noprefix(table_data, ACPI_GHES_ERROR_SOURCE_COUNT, 4);
+
+    build_ghes_v2(table_data, ACPI_HEST_SRC_ID_SEA, linker);
+
+    build_header(linker, table_data, (void *)(table_data->data + hest_start),
+        "HEST", table_data->len - hest_start, 1, NULL, NULL);
+}
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 8397bda..ef94e03 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -821,6 +821,8 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
 
     if (vms->ras) {
         build_ghes_error_table(tables->hardware_errors, tables->linker);
+        acpi_add_table(table_offsets, tables_blob);
+        acpi_build_hest(tables_blob, tables->linker);
     }
 
     if (ms->numa_state->num_nodes > 0) {