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

From: Igor Mammedov
Date: Wed Oct 02 2024 - 08:57:15 EST

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In reply to: Mauro Carvalho Chehab: "[PATCH v2 08/15] acpi/ghes: Prepare to support multiple sources on ghes"
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On Tue, 1 Oct 2024 09:03:45 +0200
Mauro Carvalho Chehab <mchehab+huawei@xxxxxxxxxx> wrote:

> 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.

above description strongly hints that patch does not belong to cleanups,
I suggest to move it to HEST series.

>
> 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));

above hunk looks like a separate change.
Namely dumb-ing down current impl. to fit reality.
(which I would keep in cleanups series)

> 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 {

maybe s/AcpiNotification/AcpiHESTNotification

> + enum AcpiGhesSourceID source_id;
> + enum AcpiGhesNotifyType notify;
are above really only GHES specific?

> +} 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);

Next message: Maciej W. Rozycki: "Re: PCI: Work around PCIe link training failures"
Previous message: Thomas Hellström: "[PATCH RESEND] locking/ww_mutex: Adjust to lockdep nest_lock requirements"
In reply to: Mauro Carvalho Chehab: "[PATCH v2 08/15] acpi/ghes: Prepare to support multiple sources on ghes"
Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]