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From 32c4fe66ae9107a7fae556be02c1401e5046071b Mon Sep 17 00:00:00 2001
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From: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
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Date: Fri, 11 Sep 2020 09:53:27 -0400
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Subject: [PATCH 53/55] lscpu: add helper to get physical sockets
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Add a helper function, get_number_of_physical_sockets_from_dmi(),
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to get physical sockets from DMI table in case of the sysfs for
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cpu topology doesn't have the physical socket information.
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get_number_of_physical_sockets_from_dmi() parse the DMI table
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and counts the number of SMBIOS Processor Information (Type04)
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structure.
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Note, ARM SBBR v1.0 and newer requires SMBIOS Processor Information
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(Type04). And ARM SBBR v1.2 requires ACPI PPTT which has physical socket
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information. So the helper function is useful for the machine base on
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SBBR v1.0 and v1.1.
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Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com>
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---
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sys-utils/lscpu-dmi.c | 30 ++++++++++++++++++++++++++++++
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sys-utils/lscpu.h | 1 +
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2 files changed, 31 insertions(+)
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diff --git a/sys-utils/lscpu-dmi.c b/sys-utils/lscpu-dmi.c
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index 9b57fe9e6..31127f48a 100644
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--- a/sys-utils/lscpu-dmi.c
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+++ b/sys-utils/lscpu-dmi.c
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@@ -46,6 +46,7 @@ struct dmi_info {
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char *vendor;
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char *product;
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char *manufacturer;
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+ int sockets;
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};
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static int checksum(const uint8_t *buf, size_t len)
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@@ -147,6 +148,9 @@ static int parse_dmi_table(uint16_t len, uint16_t num,
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di->manufacturer = dmi_string(&h, data[0x04]);
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di->product = dmi_string(&h, data[0x05]);
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break;
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+ case 4:
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+ di->sockets++;
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+ break;
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default:
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break;
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}
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@@ -323,3 +327,29 @@ done:
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free(buf);
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return rc < 0 ? HYPER_NONE : rc;
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}
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+
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+int get_number_of_physical_sockets_from_dmi(void)
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+{
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+ static char const sys_fw_dmi_tables[] = _PATH_SYS_DMI;
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+ struct dmi_info di;
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+ struct stat st;
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+ uint8_t *data;
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+ int rc = -1;
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+
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+ if (stat(sys_fw_dmi_tables, &st))
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+ return rc;
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+
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+ data = get_mem_chunk(0, st.st_size, sys_fw_dmi_tables);
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+ if (!data)
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+ return rc;
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+
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+ memset(&di, 0, sizeof(struct dmi_info));
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+ rc = parse_dmi_table(st.st_size, st.st_size/4, data, &di);
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+
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+ free(data);
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+
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+ if ((rc < 0) || !di.sockets)
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+ return rc;
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+ else
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+ return di.sockets;
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+}
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diff --git a/sys-utils/lscpu.h b/sys-utils/lscpu.h
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index bffa9df60..b190afd21 100644
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--- a/sys-utils/lscpu.h
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+++ b/sys-utils/lscpu.h
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@@ -186,6 +186,7 @@ struct lscpu_modifier {
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};
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extern int read_hypervisor_dmi(void);
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+extern int get_number_of_physical_sockets_from_dmi(void);
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extern void arm_cpu_decode(struct lscpu_desc *desc);
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#endif /* LSCPU_H */
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--
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2.29.2
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