[Skiboot] [PATCH V2 10/21] core/pldm: PLDM for Platform Monitoring and Control Specification
Christophe Lombard
clombard at linux.vnet.ibm.com
Fri Mar 18 02:39:10 AEDT 2022
Le 16/03/2022 à 10:18, Abhishek SIngh Tomar a écrit :
> hello Christophe Lombard
>
> In function get_pdr_req() CRC is not checked for data integrity.
> I recommend use of CRC for integrity check.
CRC is not used for START_AND_END. The value is always equal to 0.
>
> Regards
> Abhishek Singh Tomar
>
> On Fri, Mar 04, 2022 at 02:11:43PM +0100, Christophe Lombard wrote:
>> 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.
>>
>> Signed-off-by: Christophe Lombard <clombard at linux.vnet.ibm.com>
>> ---
>> core/pldm/Makefile.inc | 3 +
>> core/pldm/pldm-common.c | 9 ++
>> core/pldm/pldm-platform-requests.c | 232 +++++++++++++++++++++++++++++
>> core/pldm/pldm.h | 7 +
>> 4 files changed, 251 insertions(+)
>> create mode 100644 core/pldm/pldm-platform-requests.c
>>
>> diff --git a/core/pldm/Makefile.inc b/core/pldm/Makefile.inc
>> index c431288f..72f71cba 100644
>> --- a/core/pldm/Makefile.inc
>> +++ b/core/pldm/Makefile.inc
>> @@ -7,7 +7,10 @@ SUBDIRS += $(PLDM_DIR)
>> CPPFLAGS += -I$(SRC)/pldm/libpldm/
>> CPPFLAGS += -I$(SRC)/pldm/ibm/libpldm/
>>
>> +CFLAGS_$(PLDM_DIR)/pldm-platform-requests.o = -Wno-strict-prototypes
>> +
>> PLDM_OBJS = pldm-common.o pldm-responder.o pldm-requester.o
>> +PLDM_OBJS += pldm-platform-requests.o
>>
>> PLDM = $(PLDM_DIR)/built-in.a
>> $(PLDM): $(PLDM_OBJS:%=$(PLDM_DIR)/%)
>> diff --git a/core/pldm/pldm-common.c b/core/pldm/pldm-common.c
>> index 15ee2af9..ea6cb2c3 100644
>> --- a/core/pldm/pldm-common.c
>> +++ b/core/pldm/pldm-common.c
>> @@ -112,6 +112,8 @@ int pldm_mctp_init(void)
>> {
>> int rc;
>>
>> + prlog(PR_NOTICE, "%s - Getting PLDM data\n", __func__);
>> +
>> /* MCTP Binding */
>> rc = ast_mctp_init(pldm_rx_message);
>> if (rc)
>> @@ -119,7 +121,14 @@ int pldm_mctp_init(void)
>>
>> /* Register mandatory commands we'll respond to */
>> rc = pldm_mctp_responder_init();
>> + if (rc)
>> + goto out;
>> +
>> + /* Get PDRs data */
>> + rc = pldm_platform_init();
>>
>> out:
>> + prlog(PR_NOTICE, "%s - done (rc: %d)\n", __func__, rc);
>> +
>> return rc;
>> }
>> diff --git a/core/pldm/pldm-platform-requests.c b/core/pldm/pldm-platform-requests.c
>> new file mode 100644
>> index 00000000..b416cc76
>> --- /dev/null
>> +++ b/core/pldm/pldm-platform-requests.c
>> @@ -0,0 +1,232 @@
>> +// 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 <pldm/libpldm/entity.h>
>> +#include <pldm/libpldm/state_set.h>
>> +#include <pldm/libpldm/platform.h>
>> +#include "pldm.h"
>> +
>> +#define NO_MORE_PDR_HANDLES 0
>> +
>> +static pldm_pdr *repo;
>> +static bool pdr_ready;
>> +
>> +static void pdr_init_complete(bool success)
>> +{
>> + /* Read not successful, error out and free the buffer */
>> + if (!success) {
>> + pdr_ready = false;
>> +
>> + pldm_pdr_destroy(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;
>> +};
>> +
>> +/*
>> + * 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 get_pdr_req(uint32_t record_hndl, uint32_t *next_record_hndl,
>> + void **pdr_data, uint16_t *pdr_length)
>> +{
>> + char request_msg[PKT_SIZE(struct pldm_get_pdr_req)];
>> + size_t response_len, payload_len;
>> + void *response_msg;
>> + int rc, i;
>> +
>> + 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) */
>> + };
>> +
>> + struct get_pdr_response response;
>> +
>> + 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 *)request_msg,
>> + PLDM_GET_PDR_REQ_BYTES);
>> + if (rc != PLDM_SUCCESS) {
>> + prlog(PR_ERR, "Encode GetPDRReq Error (rc: %d)\n", rc);
>> + return OPAL_PARAMETER;
>> + }
>> +
>> + /* Send and get the response message bytes */
>> + rc = pldm_do_request(BMC_EID, request_msg, sizeof(request_msg),
>> + &response_msg, &response_len);
>> + if (rc) {
>> + prlog(PR_ERR, "PLDM: Communication Error (req: GetPDRReq, rc: %d)\n", rc);
>> + return OPAL_PARAMETER;
>> + }
>> +
>> + /* 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.
>> + */
>> + payload_len = response_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(
>> + response_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);
>> + return OPAL_PARAMETER;
>> + }
>> +
>> + if (response.record_data == NULL) {
>> + response.record_data_length = response.resp_cnt;
>> + response.record_data = malloc(response.resp_cnt);
>> + }
>> + }
>> +
>> + /* 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__, pdr_req.record_handle,
>> + response.next_record_hndl,
>> + response.resp_cnt);
>> +
>> + *next_record_hndl = response.next_record_hndl;
>> + *pdr_length = response.resp_cnt;
>> + *pdr_data = malloc(response.resp_cnt);
>> + memcpy(*pdr_data, response.record_data, response.resp_cnt);
>> +
>> + free(response.record_data);
>> + free(response_msg);
>> +
>> + return OPAL_SUCCESS;
>> +}
>> +
>> +/*
>> + * Collect all PDrs into a PDR Repository.
>> + */
>> +static int get_all_pdrs(pldm_pdr *repo)
>> +{
>> + uint32_t record_hndl = 0; /* first pdr handle */
>> + uint32_t next_record_hdl;
>> + void *pdr_data = NULL;
>> + uint16_t pdr_length;
>> + int rc = OPAL_SUCCESS;
>> +
>> + do {
>> + /* send/receive a PLDM GetPDR request message */
>> + rc = get_pdr_req(record_hndl, &next_record_hdl,
>> + &pdr_data, &pdr_length);
>> + if (rc)
>> + goto err;
>> +
>> + /* Add a PDR record to a PDR repository */
>> + pldm_pdr_add(repo,
>> + pdr_data,
>> + pdr_length,
>> + record_hndl,
>> + false);
>> +
>> + if (pdr_data) {
>> + free(pdr_data);
>> + pdr_data = NULL;
>> + }
>> +
>> + record_hndl = next_record_hdl;
>> +
>> + } while (next_record_hdl != NO_MORE_PDR_HANDLES);
>> +
>> +err:
>> + if (pdr_data)
>> + free(pdr_data);
>> +
>> + return rc;
>> +}
>> +
>> +int pldm_platform_init(void)
>> +{
>> + int rc;
>> +
>> + /* make a new PDR repository */
>> + repo = pldm_pdr_init();
>> +
>> + /* retrieve all PDRs */
>> + rc = get_all_pdrs(repo);
>> + if (rc) {
>> + pdr_init_complete(false);
>> + prlog(PR_ERR, "%s - done, rc: %d\n", __func__, rc);
>> + return rc;
>> + }
>> +
>> + pdr_init_complete(true);
>> + prlog(PR_DEBUG, "%s - done\n", __func__);
>> +
>> + return OPAL_SUCCESS;
>> +}
>> +
>> +void pldm_platform_exit(void)
>> +{
>> + if (pdr_ready)
>> + pldm_pdr_destroy(repo);
>> +}
>> diff --git a/core/pldm/pldm.h b/core/pldm/pldm.h
>> index fd677742..3950b111 100644
>> --- a/core/pldm/pldm.h
>> +++ b/core/pldm/pldm.h
>> @@ -6,6 +6,7 @@
>> #define __COREPLDM_H__
>>
>> #include <pldm/libpldm/base.h>
>> +#include <pldm/libpldm/utils.h>
>> #include <pldm.h>
>>
>> /* Common support */
>> @@ -21,6 +22,9 @@ void printbuf(const char *name, const char *msg, int len);
>>
>> #define PKT_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_rx_data {
>> struct pldm_header_info hdrinf; /* parsed message header */
>>
>> @@ -47,6 +51,9 @@ int pldm_rx_handle_request(struct pldm_rx_data *rx);
>> int pldm_mctp_responder_init(void);
>>
>> /* Requester support */
>> +void pldm_platform_exit(void);
>> +int pldm_platform_init(void);
>> +
>> int pldm_do_request(uint8_t dest_eid,
>> void *request_msg, size_t request_len,
>> void **response_msg, size_t *response_len);
>> --
>> 2.35.1
>>
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