[Skiboot] [PATCH V7 10/21] core/pldm: PLDM for Platform Monitoring and Control Specification
Christophe Lombard
clombard at linux.ibm.com
Fri May 12 02:24:35 AEST 2023
This specification defines the functions and data structures used for
discovering, describing, initializing, and accessing sensors and effecters
within the management controllers and management devices of a platform
management subsystem using PLDM messaging.
A PDR (Platform Descriptor Record) is a set of data that is used to
provide semantic information about sensors, effecters, monitored or
controller entities, and functions and services within a PLDM
implementation.
PDRs are mostly used to support PLDM monitoring and control and platform
events.
The PDRs for a PLDM subsystem are collected into a single, central PDR
Repository. A central repository provides a single place from which PDR
information can be retrieved.
The GetPDR command is used to retrieve individual PDRs from a PDR
Repository. The record is identified by the PDR recordHandle value that is
passed in the request.
The patch dump all the PDRs within a PDR Repository.
Reviewed-by: Abhishek Singh Tomar <abhishek at linux.ibm.com>
Signed-off-by: Christophe Lombard <clombard at linux.ibm.com>
---
core/pldm/Makefile.inc | 3 +
core/pldm/pldm-base-requests.c | 76 +++++++
core/pldm/pldm-mctp.c | 14 ++
core/pldm/pldm-platform-requests.c | 309 +++++++++++++++++++++++++++++
core/pldm/pldm.h | 9 +
5 files changed, 411 insertions(+)
create mode 100644 core/pldm/pldm-base-requests.c
create mode 100644 core/pldm/pldm-platform-requests.c
diff --git a/core/pldm/Makefile.inc b/core/pldm/Makefile.inc
index f2328a4b..5609a6b7 100644
--- a/core/pldm/Makefile.inc
+++ b/core/pldm/Makefile.inc
@@ -7,7 +7,10 @@ SUBDIRS += $(PLDM_DIR)
CPPFLAGS += -I$(SRC)/pldm/include/
CPPFLAGS += -I$(SRC)/pldm/include/libpldm/oem/ibm/
+CFLAGS_$(PLDM_DIR)/pldm-platform-requests.o = -Wno-strict-prototypes
+
PLDM_OBJS = pldm-mctp.o pldm-responder.o pldm-requester.o
+PLDM_OBJS += pldm-base-requests.o pldm-platform-requests.o
PLDM = $(PLDM_DIR)/built-in.a
$(PLDM): $(PLDM_OBJS:%=$(PLDM_DIR)/%)
diff --git a/core/pldm/pldm-base-requests.c b/core/pldm/pldm-base-requests.c
new file mode 100644
index 00000000..d8984277
--- /dev/null
+++ b/core/pldm/pldm-base-requests.c
@@ -0,0 +1,76 @@
+// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+// Copyright 2022 IBM Corp.
+
+#define pr_fmt(fmt) "PLDM: " fmt
+
+#include <cpu.h>
+#include <opal.h>
+#include <stdio.h>
+#include <string.h>
+#include <inttypes.h>
+#include <libpldm/base.h>
+#include "pldm.h"
+
+static uint8_t bmc_tid = -1;
+
+uint8_t pldm_base_get_bmc_tid(void)
+{
+ return bmc_tid;
+}
+
+/*
+ * Create a PLDM request message for GetTID.
+ */
+int pldm_base_get_tid_req(void)
+{
+ size_t data_size = PLDM_MSG_SIZE(0); /* the command doesn't have a message payload */
+ size_t response_len, payload_len;
+ struct pldm_tx_data *tx = NULL;
+ void *response_msg;
+ int rc;
+
+ struct pldm_get_tid_resp response;
+
+ /* Encode the get tid request */
+ tx = zalloc(sizeof(struct pldm_tx_data) + data_size);
+ if (!tx)
+ return OPAL_NO_MEM;
+ tx->data_size = data_size;
+
+ rc = encode_get_tid_req(DEFAULT_INSTANCE_ID,
+ (struct pldm_msg *)tx->data);
+ if (rc != PLDM_SUCCESS) {
+ prlog(PR_ERR, "Encode GetTID Error, rc: %d\n", rc);
+ free(tx);
+ return OPAL_PARAMETER;
+ }
+
+ /* Send and get the response message bytes */
+ rc = pldm_requester_queue_and_wait(tx, &response_msg, &response_len);
+ if (rc) {
+ prlog(PR_ERR, "Communication Error, req: GetTID, rc: %d\n", rc);
+ free(tx);
+ return rc;
+ }
+
+ /* Decode the message */
+ payload_len = response_len - sizeof(struct pldm_msg_hdr);
+
+ rc = decode_get_tid_resp(response_msg, payload_len,
+ &response.completion_code,
+ &response.tid);
+ if ((rc != PLDM_SUCCESS) || (response.completion_code != PLDM_SUCCESS)) {
+ prlog(PR_ERR, "Decode GetTID Error, rc: %d, cc: %d\n",
+ rc, response.completion_code);
+ free(tx);
+ free(response_msg);
+ return OPAL_PARAMETER;
+ }
+
+ prlog(PR_INFO, "BMC's TID is %d\n", response.tid);
+ bmc_tid = response.tid;
+ free(tx);
+ free(response_msg);
+
+ return OPAL_SUCCESS;
+}
diff --git a/core/pldm/pldm-mctp.c b/core/pldm/pldm-mctp.c
index cfa6d2fc..66074ded 100644
--- a/core/pldm/pldm-mctp.c
+++ b/core/pldm/pldm-mctp.c
@@ -95,6 +95,18 @@ int pldm_mctp_init(void)
/* Requester implementation */
pldm_requester_init();
+ /* Get BMC tid */
+ rc = pldm_base_get_tid_req();
+ if (rc) {
+ prlog(PR_ERR, "Failed to retrieve BMC Tid\n");
+ goto out;
+ }
+
+ /* Get PDRs data */
+ rc = pldm_platform_init();
+ if (rc)
+ prlog(PR_ERR, "Failed to retrieve Data Records\n");
+
out:
prlog(PR_NOTICE, "%s - done, rc: %d\n", __func__, rc);
return rc;
@@ -102,5 +114,7 @@ out:
void pldm_mctp_exit(void)
{
+ pldm_platform_exit();
+
ast_mctp_exit();
}
diff --git a/core/pldm/pldm-platform-requests.c b/core/pldm/pldm-platform-requests.c
new file mode 100644
index 00000000..6c019182
--- /dev/null
+++ b/core/pldm/pldm-platform-requests.c
@@ -0,0 +1,309 @@
+// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+// Copyright 2022 IBM Corp.
+
+#define pr_fmt(fmt) "PLDM: " fmt
+
+#include <cpu.h>
+#include <opal.h>
+#include <stdio.h>
+#include <string.h>
+#include <timebase.h>
+#include <inttypes.h>
+#include <libpldm/entity.h>
+#include <libpldm/pdr.h>
+#include <libpldm/state_set.h>
+#include <libpldm/platform.h>
+#include "pldm.h"
+
+#define NO_MORE_PDR_HANDLES 0
+
+static pldm_pdr *pdrs_repo;
+static bool pdr_ready;
+
+struct pldm_pdrs {
+ struct pldm_tx_data *tx;
+ uint32_t record_hndl;
+ bool done;
+ int rc;
+};
+
+struct pldm_pdrs *pdrs;
+
+static void pdr_init_complete(bool success)
+{
+ /* Read not successful, error out and free the buffer */
+ if (!success) {
+ pdr_ready = false;
+
+ if (pdrs_repo)
+ pldm_pdr_destroy(pdrs_repo);
+ return;
+ }
+
+ /* Mark ready */
+ pdr_ready = true;
+}
+
+struct get_pdr_response {
+ uint8_t completion_code;
+ uint32_t next_record_hndl;
+ uint32_t next_data_transfer_hndl;
+ uint8_t transfer_flag;
+ uint16_t resp_cnt;
+ uint8_t *record_data;
+ size_t record_data_length;
+ uint8_t transfer_crc;
+};
+
+static int encode_and_queue_get_pdr_req(struct pldm_pdrs *pdrs);
+
+static void get_pdr_req_complete(struct pldm_rx_data *rx,
+ void *data)
+{
+ struct pldm_pdrs *pdrs = (struct pldm_pdrs *)data;
+ uint32_t record_hndl = pdrs->record_hndl;
+ struct get_pdr_response response;
+ size_t payload_len;
+ int rc, i;
+
+ prlog(PR_DEBUG, "%s - record_hndl: %d\n", __func__, record_hndl);
+
+ if (rx == NULL) {
+ pdrs->rc = OPAL_PARAMETER;
+ pdrs->done = true;
+ }
+
+ /* Decode the message twice; the first time, the payload buffer
+ * will be null so that the decoder will simply tell us how big
+ * the buffer should be. Then we create a suitable payload
+ * buffer and call the decoder again, this time with the real
+ * buffer so that it can fill it with data from the message.
+ *
+ * transfer_crc is not used in case of PLDM_START_AND_END.
+ */
+ payload_len = rx->msg_len - sizeof(struct pldm_msg_hdr);
+ response.record_data_length = 0;
+ response.record_data = NULL;
+
+ for (i = 0; i < 2; i++) {
+ rc = decode_get_pdr_resp(
+ rx->msg, payload_len,
+ &response.completion_code,
+ &response.next_record_hndl,
+ &response.next_data_transfer_hndl,
+ &response.transfer_flag,
+ &response.resp_cnt,
+ response.record_data,
+ response.record_data_length,
+ &response.transfer_crc);
+
+ if (rc != PLDM_SUCCESS || response.completion_code != PLDM_SUCCESS) {
+ /* Message decoding failed */
+ prlog(PR_ERR, "Decode GetPDRResp Error (rc: %d, cc: %d)\n",
+ rc, response.completion_code);
+
+ /* BMC is not ready, try again. This behavior can be
+ * encountered when the BMC reboots and the host is
+ * still operational.
+ * The host receives a GET VERSION request indicating
+ * that we must rehcrage the pdrs.
+ */
+ if (response.completion_code == PLDM_ERROR_NOT_READY) {
+ time_wait_ms(500);
+ encode_and_queue_get_pdr_req(pdrs);
+ return;
+ }
+
+ pdrs->rc = OPAL_PARAMETER;
+ pdrs->done = true;
+ return;
+ }
+
+ if (response.record_data == NULL) {
+ response.record_data_length = response.resp_cnt;
+ response.record_data = zalloc(response.resp_cnt);
+ if (!response.record_data) {
+ prlog(PR_ERR, "failed to allocate record data (size: 0x%lx)\n", response.record_data_length);
+ pdrs->rc = OPAL_NO_MEM;
+ pdrs->done = true;
+ return;
+ }
+ }
+ }
+
+ /* we do not support multipart transfer */
+ if (response.transfer_flag != PLDM_START_AND_END)
+ prlog(PR_ERR, "Transfert GetPDRResp not complete, transfer_flag: %d\n",
+ response.transfer_flag);
+
+ prlog(PR_DEBUG, "%s - record_hndl: %d, next_record_hndl: %d, resp_cnt: %d\n",
+ __func__, record_hndl,
+ response.next_record_hndl,
+ response.resp_cnt);
+
+ /* Add a PDR record to a PDR repository.
+ * Use HOST_TID as terminus handle
+ */
+ pldm_pdr_add(pdrs_repo,
+ response.record_data,
+ response.resp_cnt,
+ record_hndl,
+ false,
+ HOST_TID);
+
+ free(response.record_data);
+
+ if (response.next_record_hndl != NO_MORE_PDR_HANDLES) {
+ pdrs->record_hndl = response.next_record_hndl;
+ encode_and_queue_get_pdr_req(pdrs);
+ } else {
+ /* We have to indicate the end of the initialization when we
+ * reload the pdrs in background
+ */
+ pdr_init_complete(true);
+ pdrs->done = true;
+ pdrs->rc = OPAL_SUCCESS;
+ prlog(PR_DEBUG, "%s - done\n", __func__);
+ }
+}
+
+/*
+ * Send/receive a PLDM GetPDR stateEffecter request message
+ * Get platform descriptor records.
+ *
+ * pldmtool platform GetPDR -t stateEffecter
+ * ...
+ * {
+ * "nextRecordHandle": 138,
+ * "responseCount": 30,
+ * "recordHandle": 137,
+ * "PDRHeaderVersion": 1,
+ * "PDRType": "State Effecter PDR",
+ * "recordChangeNumber": 0,
+ * "dataLength": 20,
+ * "PLDMTerminusHandle": 1,
+ * "effecterID": 43,
+ * "entityType": "[Physical] System chassis (main enclosure)",
+ * ...
+ * "Off-Soft Graceful(9)"
+ * }
+ * ...
+ */
+static int encode_and_queue_get_pdr_req(struct pldm_pdrs *pdrs)
+{
+ uint32_t record_hndl = pdrs->record_hndl;
+ int rc;
+
+ struct pldm_get_pdr_req pdr_req = {
+ .record_handle = record_hndl, /* record change number (0 for first request) */
+ .data_transfer_handle = 0, /* (0 if transfer op is FIRSTPART) */
+ .transfer_op_flag = PLDM_GET_FIRSTPART, /* transfer op flag */
+ .request_count = SHRT_MAX, /* Don't limit the size of the PDR */
+ .record_change_number = 0 /* record change number (0 for first request) */
+ };
+
+ prlog(PR_DEBUG, "%s - record_hndl: %d\n", __func__, record_hndl);
+
+ /* Encode the get_PDR request */
+ rc = encode_get_pdr_req(DEFAULT_INSTANCE_ID,
+ pdr_req.record_handle,
+ pdr_req.data_transfer_handle,
+ pdr_req.transfer_op_flag,
+ pdr_req.request_count,
+ pdr_req.record_change_number,
+ (struct pldm_msg *)pdrs->tx->data,
+ PLDM_GET_PDR_REQ_BYTES);
+ if (rc != PLDM_SUCCESS) {
+ prlog(PR_ERR, "Encode GetPDRReq Error, rc: %d\n", rc);
+ pdrs->done = true;
+ pdrs->rc = OPAL_PARAMETER;
+ return OPAL_PARAMETER;
+ }
+
+ /* Queue the first getpdr request */
+ rc = pldm_requester_queue(pdrs->tx, get_pdr_req_complete, pdrs);
+ if (rc) {
+ prlog(PR_ERR, "Communication Error, req: GetPDRReq, rc: %d\n", rc);
+ pdrs->done = true;
+ pdrs->rc = OPAL_PARAMETER;
+ }
+
+ return rc;
+}
+
+static int pldm_platform_load_pdrs(void)
+{
+ /* destroy current repo and mark repo not ready */
+ pdr_init_complete(false);
+
+ /* make a new PDR repository */
+ pdrs_repo = pldm_pdr_init();
+
+ /* collect all PDrs into a PDR Repository */
+ pdrs->record_hndl = 0;
+ pdrs->done = false;
+ return encode_and_queue_get_pdr_req(pdrs);
+}
+
+static int pdrs_init(void)
+{
+ int rc;
+
+ rc = pldm_platform_load_pdrs();
+ if (rc)
+ return rc;
+
+ /* wait for the end of pdrs received */
+ for (;;) {
+ if (pdrs->done)
+ break;
+
+ time_wait_ms(5);
+ }
+ return pdrs->rc;
+}
+
+int pldm_platform_init(void)
+{
+ size_t data_size = PLDM_MSG_SIZE(struct pldm_get_pdr_req);
+ int rc;
+
+ pdrs = zalloc(sizeof(struct pldm_pdrs));
+ if (!pdrs) {
+ prlog(PR_ERR, "failed to allocate pdrs\n");
+ return OPAL_NO_MEM;
+ }
+
+ pdrs->tx = zalloc(sizeof(struct pldm_tx_data) + data_size);
+ if (!pdrs->tx)
+ return OPAL_NO_MEM;
+ pdrs->tx->data_size = data_size;
+
+ /* retrieve all PDRs */
+ rc = pdrs_init();
+ if (rc)
+ goto err;
+
+ pdr_init_complete(true);
+ prlog(PR_DEBUG, "%s - done\n", __func__);
+
+ return OPAL_SUCCESS;
+
+err:
+ prlog(PR_ERR, "%s - failed to initialize pdrs, rc: %d\n", __func__, rc);
+ pdr_init_complete(false);
+ free(pdrs->tx);
+ free(pdrs);
+ return rc;
+}
+
+void pldm_platform_exit(void)
+{
+ if (pdr_ready)
+ pldm_pdr_destroy(pdrs_repo);
+
+ if (pdrs) {
+ free(pdrs->tx);
+ free(pdrs);
+ }
+}
diff --git a/core/pldm/pldm.h b/core/pldm/pldm.h
index d7a310c0..563a6f52 100644
--- a/core/pldm/pldm.h
+++ b/core/pldm/pldm.h
@@ -11,6 +11,9 @@
#define PLDM_MSG_SIZE(x) (sizeof(struct pldm_msg_hdr) + sizeof(x))
+/* For all of the encode functions just pass in a default ID (0x00) */
+#define DEFAULT_INSTANCE_ID 0
+
struct pldm_tx_data {
/* Contains an message header and payload of an MCTP packet.
* Size of data[]
@@ -48,6 +51,12 @@ int pldm_responder_handle_request(struct pldm_rx_data *rx);
int pldm_responder_init(void);
/* Requester support */
+uint8_t pldm_base_get_bmc_tid(void);
+int pldm_base_get_tid_req(void);
+
+int pldm_platform_init(void);
+void pldm_platform_exit(void);
+
int pldm_requester_handle_response(struct pldm_rx_data *rx);
int pldm_requester_queue(struct pldm_tx_data *tx,
void (*complete)(struct pldm_rx_data *rx, void *data),
--
2.40.1
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