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Message-ID: <20241120141838.000070c1@huawei.com>
Date: Wed, 20 Nov 2024 14:18:38 +0000
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
CC: Igor Mammedov <imammedo@...hat.com>, Shiju Jose <shiju.jose@...wei.com>,
"Michael S. Tsirkin" <mst@...hat.com>, Ani Sinha <anisinha@...hat.com>,
Dongjiu Geng <gengdongjiu1@...il.com>, <linux-kernel@...r.kernel.org>,
<qemu-arm@...gnu.org>, <qemu-devel@...gnu.org>
Subject: Re: [PATCH v3 08/15] acpi/ghes: make the GHES record generation
more generic
On Tue, 12 Nov 2024 11:14:52 +0100
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> wrote:
> Split the code into separate functions to allow using the
> common CPER filling code by different error sources.
>
> The generic code was moved to ghes_record_cper_errors(),
> and ghes_gen_err_data_uncorrectable_recoverable() now contains
> only a logic to fill GEGB part of the record.
GESB?
>
> The remaining code to generate a memory error now belongs to
> acpi_ghes_record_errors() function.
>
> A further patch will give it a better name.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Hi Mauro,
I've kind of forgotten how all this works. Anyhow, looking afresh
I think there is a functional change in her which I wasn't expecting
to see.
> ---
> hw/acpi/ghes.c | 122 +++++++++++++++++++++++------------------
> include/hw/acpi/ghes.h | 3 +
> 2 files changed, 73 insertions(+), 52 deletions(-)
>
> diff --git a/hw/acpi/ghes.c b/hw/acpi/ghes.c
> index edc74c38bf8a..0eb874a11ff7 100644
> --- a/hw/acpi/ghes.c
> +++ b/hw/acpi/ghes.c
> @@ -181,51 +181,30 @@ static void acpi_ghes_build_append_mem_cper(GArray *table,
> build_append_int_noprefix(table, 0, 7);
> }
>
> -static int acpi_ghes_record_mem_error(uint64_t error_block_address,
> - uint64_t error_physical_addr)
> +static void
> +ghes_gen_err_data_uncorrectable_recoverable(GArray *block,
> + const uint8_t *section_type,
> + int data_length)
> {
> - GArray *block;
> -
> - /* Memory Error Section Type */
> - const uint8_t uefi_cper_mem_sec[] =
> - UUID_LE(0xA5BC1114, 0x6F64, 0x4EDE, 0xB8, 0x63, 0x3E, 0x83, \
> - 0xED, 0x7C, 0x83, 0xB1);
> -
> /* invalid fru id: ACPI 4.0: 17.3.2.6.1 Generic Error Data,
> * Table 17-13 Generic Error Data Entry
> */
> QemuUUID fru_id = {};
> - uint32_t data_length;
>
> - block = g_array_new(false, true /* clear */, 1);
> -
> - /* This is the length if adding a new generic error data entry*/
> - data_length = ACPI_GHES_DATA_LENGTH + ACPI_GHES_MEM_CPER_LENGTH;
> /*
> - * It should not run out of the preallocated memory if adding a new generic
> - * error data entry
> + * Calculate the size with this block. No need to check for
> + * too big CPER, as CPER size is checked at ghes_record_cper_errors()
> */
> - assert((data_length + ACPI_GHES_GESB_SIZE) <=
> - ACPI_GHES_MAX_RAW_DATA_LENGTH);
> + data_length += ACPI_GHES_GESB_SIZE;
After this change the data length passe dto acpi_ghes_generic_error_status is
ACPI_GHES_MAX_RAW_DATA_LENGTH + ACPI_GHES_GESB_SIZE;
I can't see why that would be the same as previous value of
ACPI_GHES_DATA_LENGTH + ACPI_GHES_MEM_CPER_LENGTH
So is this a functional change? If so please call it out in the patch
description with some info on why it doesn't matter.
>
> /* Build the new generic error status block header */
> acpi_ghes_generic_error_status(block, ACPI_GEBS_UNCORRECTABLE,
> 0, 0, data_length, ACPI_CPER_SEV_RECOVERABLE);
>
> /* Build this new generic error data entry header */
> - acpi_ghes_generic_error_data(block, uefi_cper_mem_sec,
> + acpi_ghes_generic_error_data(block, section_type,
> ACPI_CPER_SEV_RECOVERABLE, 0, 0,
> ACPI_GHES_MEM_CPER_LENGTH, fru_id, 0);
> -
> - /* Build the memory section CPER for above new generic error data entry */
> - acpi_ghes_build_append_mem_cper(block, error_physical_addr);
> -
> - /* Write the generic error data entry into guest memory */
> - cpu_physical_memory_write(error_block_address, block->data, block->len);
> -
> - g_array_free(block, true);
> -
> - return 0;
> }
>
> /*
> @@ -383,15 +362,18 @@ void acpi_ghes_add_fw_cfg(AcpiGhesState *ags, FWCfgState *s,
> ags->present = true;
> }
>
> -int acpi_ghes_record_errors(uint16_t source_id, uint64_t physical_address)
> +void ghes_record_cper_errors(const void *cper, size_t len,
> + uint16_t source_id, Error **errp)
> {
> uint64_t error_block_addr, read_ack_register_addr, read_ack_register = 0;
> uint64_t start_addr;
> - bool ret = -1;
> AcpiGedState *acpi_ged_state;
> AcpiGhesState *ags;
>
> - assert(source_id < ACPI_GHES_ERROR_SOURCE_COUNT);
> + if (len > ACPI_GHES_MAX_RAW_DATA_LENGTH) {
> + error_setg(errp, "GHES CPER record is too big: %ld", len);
> + return;
> + }
>
> acpi_ged_state = ACPI_GED(object_resolve_path_type("", TYPE_ACPI_GED,
> NULL));
> @@ -400,16 +382,16 @@ int acpi_ghes_record_errors(uint16_t source_id, uint64_t physical_address)
>
> 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);
> + if (!error_block_addr) {
> + error_setg(errp, "can not find Generic Error Status Block");
> + return;
> + }
>
> read_ack_register_addr = start_addr +
> ACPI_GHES_ERROR_SOURCE_COUNT * sizeof(uint64_t);
> @@ -419,24 +401,60 @@ int acpi_ghes_record_errors(uint16_t source_id, uint64_t physical_address)
>
> /* zero means OSPM does not acknowledge the error */
> if (!read_ack_register) {
> - error_report("OSPM does not acknowledge previous error,"
> - " so can not record CPER for current error anymore");
> - } else if (error_block_addr) {
> - read_ack_register = cpu_to_le64(0);
> - /*
> - * Clear the Read Ack Register, OSPM will write it to 1 when
> - * it acknowledges this error.
> - */
> - cpu_physical_memory_write(read_ack_register_addr,
> - &read_ack_register, sizeof(uint64_t));
> -
> - ret = acpi_ghes_record_mem_error(error_block_addr,
> - physical_address);
> - } else {
> - error_report("can not find Generic Error Status Block");
> + error_setg(errp,
> + "OSPM does not acknowledge previous error,"
> + " so can not record CPER for current error anymore");
> + return;
> }
>
> - return ret;
> + read_ack_register = cpu_to_le64(0);
> + /*
> + * Clear the Read Ack Register, OSPM will write it to 1 when
> + * it acknowledges this error.
> + */
> + cpu_physical_memory_write(read_ack_register_addr,
> + &read_ack_register, sizeof(uint64_t));
Alignment of this could be more consistent with rest of the code around it.
So perhaps align after (
> +
> + /* Write the generic error data entry into guest memory */
> + cpu_physical_memory_write(error_block_addr, cper, len);
> +
> + return;
> +}
> +
> +int acpi_ghes_record_errors(uint16_t source_id, uint64_t physical_address)
> +{
> + /* Memory Error Section Type */
> + const uint8_t guid[] =
> + UUID_LE(0xA5BC1114, 0x6F64, 0x4EDE, 0xB8, 0x63, 0x3E, 0x83, \
> + 0xED, 0x7C, 0x83, 0xB1);
> + Error *errp = NULL;
> + GArray *block;
> +
> + if (!physical_address) {
> + error_report("can not find Generic Error Status Block for source id %d",
> + source_id);
> + return -1;
> + }
> +
> + block = g_array_new(false, true /* clear */, 1);
> +
> + ghes_gen_err_data_uncorrectable_recoverable(block, guid,
> + ACPI_GHES_MAX_RAW_DATA_LENGTH);
> +
> + /* Build the memory section CPER for above new generic error data entry */
> + acpi_ghes_build_append_mem_cper(block, physical_address);
> +
> + /* Report the error */
> + ghes_record_cper_errors(block->data, block->len, source_id, &errp);
> +
> + g_array_free(block, true);
> +
> + if (errp) {
> + error_report_err(errp);
> + return -1;
> + }
> +
> + return 0;
> }
>
> bool acpi_ghes_present(void)
> diff --git a/include/hw/acpi/ghes.h b/include/hw/acpi/ghes.h
> index 9295e46be25e..8859346af51a 100644
> --- a/include/hw/acpi/ghes.h
> +++ b/include/hw/acpi/ghes.h
> @@ -23,6 +23,7 @@
> #define ACPI_GHES_H
>
> #include "hw/acpi/bios-linker-loader.h"
> +#include "qapi/error.h"
>
> /*
> * Values for Hardware Error Notification Type field
> @@ -73,6 +74,8 @@ void acpi_build_hest(GArray *table_data, GArray *hardware_errors,
> const char *oem_id, const char *oem_table_id);
> void acpi_ghes_add_fw_cfg(AcpiGhesState *vms, FWCfgState *s,
> GArray *hardware_errors);
> +void ghes_record_cper_errors(const void *cper, size_t len,
> + uint16_t source_id, Error **errp);
> int acpi_ghes_record_errors(uint16_t source_id, uint64_t error_physical_addr);
>
> /**
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