[PATCH v2 08/15] acpi/ghes: Prepare to support multiple sources on ghes

From: Mauro Carvalho Chehab
Date: Tue Oct 01 2024 - 03:06:05 EST

The current code is actually dependent on having just one
error structure with a single source.

As the number of sources should be arch-dependent, as it
will depend on what kind of synchronous/assynchronous
notifications will exist, change the logic to dynamically
build the table.

Yet, for a proper support, we need to get the number of
sources by reading the number from the HEST table. However,
bios currently doesn't store a pointer to it.

For now just change the logic at table build time, while
enforcing that it will behave like before with a single
source ID.

A future patch will add a HEST table bios pointer and
change the logic at acpi_ghes_record_errors() to
dynamically use the new size.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
---
hw/acpi/ghes.c | 65 ++++++++++++++++++++++++----------------
hw/arm/virt-acpi-build.c | 5 ++++
include/hw/acpi/ghes.h | 21 ++++++++-----
3 files changed, 59 insertions(+), 32 deletions(-)

diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
index edc74c38bf8a..f3d0283beb3b 100644
--- a/hw/acpi/ghes.c
+++ b/hw/acpi/ghes.c
@@ -233,17 +233,26 @@ static int acpi_ghes_record_mem_error(uint64_t error_block_address,
* Initialize "etc/hardware_errors" and "etc/hardware_errors_addr" fw_cfg blobs.
* See docs/specs/acpi_hest_ghes.rst for blobs format.
*/
-static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker)
+static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker,
+ int num_sources)
{
int i, error_status_block_offset;

+ /*
+ * TODO: Current version supports only one source.
+ * A further patch will drop this check, after adding a proper migration
+ * code, as, for the code to work, we need to store a bios pointer to the
+ * HEST table.
+ */
+ assert(num_sources == 1);
+
/* Build error_block_address */
- for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) {
+ for (i = 0; i < num_sources; i++) {
build_append_int_noprefix(hardware_errors, 0, sizeof(uint64_t));
}

/* Build read_ack_register */
- for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) {
+ for (i = 0; i < num_sources; i++) {
/*
* Initialize the value of read_ack_register to 1, so GHES can be
* writable after (re)boot.
@@ -258,13 +267,13 @@ static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker)

/* Reserve space for Error Status Data Block */
acpi_data_push(hardware_errors,
- ACPI_GHES_MAX_RAW_DATA_LENGTH * ACPI_GHES_ERROR_SOURCE_COUNT);
+ ACPI_GHES_MAX_RAW_DATA_LENGTH * num_sources);

/* Tell guest firmware to place hardware_errors blob into RAM */
bios_linker_loader_alloc(linker, ACPI_GHES_ERRORS_FW_CFG_FILE,
hardware_errors, sizeof(uint64_t), false);

- for (i = 0; i < ACPI_GHES_ERROR_SOURCE_COUNT; i++) {
+ for (i = 0; i < num_sources; i++) {
/*
* Tell firmware to patch error_block_address entries to point to
* corresponding "Generic Error Status Block"
@@ -286,10 +295,12 @@ static void build_ghes_error_table(GArray *hardware_errors, BIOSLinker *linker)
/* Build Generic Hardware Error Source version 2 (GHESv2) */
static void build_ghes_v2(GArray *table_data,
BIOSLinker *linker,
- enum AcpiGhesNotifyType notify,
- uint16_t source_id)
+ const AcpiNotificationSourceId *notif_src,
+ uint16_t index, int num_sources)
{
uint64_t address_offset;
+ const uint16_t notify = notif_src->notify;
+ const uint16_t source_id = notif_src->source_id;

/*
* Type:
@@ -318,7 +329,7 @@ static void build_ghes_v2(GArray *table_data,
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));
+ ACPI_GHES_ERRORS_FW_CFG_FILE, index * sizeof(uint64_t));

/* Notification Structure */
build_ghes_hw_error_notification(table_data, notify);
@@ -335,9 +346,10 @@ static void build_ghes_v2(GArray *table_data,
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));
+ address_offset + GAS_ADDR_OFFSET,
+ sizeof(uint64_t),
+ ACPI_GHES_ERRORS_FW_CFG_FILE,
+ (num_sources + index) * sizeof(uint64_t));

/*
* Read Ack Preserve field
@@ -352,19 +364,23 @@ static void build_ghes_v2(GArray *table_data,
/* Build Hardware Error Source Table */
void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
BIOSLinker *linker,
+ const AcpiNotificationSourceId * const notif_source,
+ int num_sources,
const char *oem_id, const char *oem_table_id)
{
AcpiTable table = { .sig = "HEST", .rev = 1,
.oem_id = oem_id, .oem_table_id = oem_table_id };
+ int i;

- build_ghes_error_table(hardware_errors, linker);
+ build_ghes_error_table(hardware_errors, linker, num_sources);

acpi_table_begin(&table, table_data);

/* Error Source Count */
- build_append_int_noprefix(table_data, ACPI_GHES_ERROR_SOURCE_COUNT, 4);
- build_ghes_v2(table_data, linker,
- ACPI_GHES_NOTIFY_SEA, ACPI_HEST_SRC_ID_SEA);
+ build_append_int_noprefix(table_data, num_sources, 4);
+ for (i = 0; i < num_sources; i++) {
+ build_ghes_v2(table_data, linker, &notif_source[i], i, num_sources);
+ }

acpi_table_end(linker, &table);
}
@@ -391,28 +407,27 @@ int acpi_ghes_record_errors(uint16_t source_id, uint64_t physical_address)
AcpiGedState *acpi_ged_state;
AcpiGhesState *ags;

- assert(source_id < ACPI_GHES_ERROR_SOURCE_COUNT);
-
acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED,
NULL));
g_assert(acpi_ged_state);
ags = &acpi_ged_state->ghes_state;

+ /*
+ * Current version supports only one source, as assured during table build,
+ * so no need to change the start offset based on the source ID.
+ */
start_addr = le64_to_cpu(ags->ghes_addr_le);

- if (!physical_address) {
- return -1;
- }
-
- start_addr += source_id * sizeof(uint64_t);
-
cpu_physical_memory_read(start_addr, &error_block_addr,
sizeof(error_block_addr));

error_block_addr = le64_to_cpu(error_block_addr);

- read_ack_register_addr = start_addr +
- ACPI_GHES_ERROR_SOURCE_COUNT * sizeof(uint64_t);
+ /*
+ * As the current version supports only one source, the ack offset is
+ * just sizeof(uint64_t).
+ */
+ read_ack_register_addr = start_addr + sizeof(uint64_t);

cpu_physical_memory_read(read_ack_register_addr,
&read_ack_register, sizeof(read_ack_register));
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index bafd9a56c217..476c365851c4 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -890,6 +890,10 @@ static void acpi_align_size(GArray *blob, unsigned align)
g_array_set_size(blob, ROUND_UP(acpi_data_len(blob), align));
}

+static const AcpiNotificationSourceId hest_ghes_notify[] = {
+ {ACPI_HEST_SRC_ID_SYNC, ACPI_GHES_NOTIFY_SEA},
+};
+
static
void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
{
@@ -945,6 +949,7 @@ void virt_acpi_build(VirtMachineState *vms, AcpiBuildTables *tables)
if (vms->ras) {
acpi_add_table(table_offsets, tables_blob);
acpi_build_hest(tables_blob, tables->hardware_errors, tables->linker,
+ hest_ghes_notify, ARRAY_SIZE(hest_ghes_notify),
vms->oem_id, vms->oem_table_id);
}

diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
index 9295e46be25e..d6e2801d9cd9 100644
--- a/include/hw/acpi/ghes.h
+++ b/include/hw/acpi/ghes.h
@@ -56,20 +56,27 @@ enum AcpiGhesNotifyType {
ACPI_GHES_NOTIFY_RESERVED = 12
};

-enum {
- ACPI_HEST_SRC_ID_SEA = 0,
- /* future ids go here */
-
- ACPI_GHES_ERROR_SOURCE_COUNT
-};
-
typedef struct AcpiGhesState {
uint64_t ghes_addr_le;
bool present; /* True if GHES is present at all on this board */
} AcpiGhesState;

+/*
+ * ID numbers used to fill HEST source ID field
+ */
+enum AcpiGhesSourceID {
+ ACPI_HEST_SRC_ID_SYNC,
+};
+
+typedef struct AcpiNotificationSourceId {
+ enum AcpiGhesSourceID source_id;
+ enum AcpiGhesNotifyType notify;
+} AcpiNotificationSourceId;
+
void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
BIOSLinker *linker,
+ const AcpiNotificationSourceId * const notif_source,
+ int num_sources,
const char *oem_id, const char *oem_table_id);
void acpi_ghes_add_fw_cfg(AcpiGhesState *vms, FWCfgState *s,
GArray *hardware_errors);
--
2.46.0