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Wed, 19 Apr 2023 14:13:57 GMT Received: from jinlmao-gv.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.42; Wed, 19 Apr 2023 07:13:53 -0700 From: Mao Jinlong To: Steven Rostedt , Masami Hiramatsu , Jonathan Corbet , Alexander Shishkin , Maxime Coquelin , Alexandre Torgue , Tingwei Zhang CC: Mao Jinlong , , , , , , , Yuanfang Zhang , Tao Zhang , Hao Zhang Subject: [PATCH v2] stm: class: Add MIPI OST protocol support Date: Wed, 19 Apr 2023 22:13:28 +0800 Message-ID: <20230419141328.37472-1-quic_jinlmao@quicinc.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nalasex01a.na.qualcomm.com (10.47.209.196) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: hRjNNcSDHr8pcnb-3s97ZZw0UQA2JOZz X-Proofpoint-GUID: hRjNNcSDHr8pcnb-3s97ZZw0UQA2JOZz X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-19_09,2023-04-18_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 bulkscore=0 priorityscore=1501 lowpriorityscore=0 impostorscore=0 phishscore=0 mlxscore=0 mlxlogscore=999 malwarescore=0 suspectscore=0 clxscore=1011 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2304190127 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230419_071416_928370_141DEE3B X-CRM114-Status: GOOD ( 33.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add MIPI OST(Open System Trace) protocol support for stm to format the traces. OST over STP packet consists of Header/Payload/End. In header, there will be STARTSIMPLE/VERSION/ENTITY/PROTOCOL. STARTSIMPLE is used to signal the beginning of a simplified OST base protocol packet.The Entity ID field is a one byte unsigned number that identifies the source. FLAG packet is used for END token. Signed-off-by: Tingwei Zhang Signed-off-by: Yuanfang Zhang Signed-off-by: Mao Jinlong --- .../ABI/testing/configfs-stp-policy-p_ost | 13 ++ Documentation/trace/p_ost.rst | 40 ++++ drivers/hwtracing/stm/Kconfig | 14 ++ drivers/hwtracing/stm/Makefile | 2 + drivers/hwtracing/stm/p_ost.c | 213 ++++++++++++++++++ 5 files changed, 282 insertions(+) create mode 100644 Documentation/ABI/testing/configfs-stp-policy-p_ost create mode 100644 Documentation/trace/p_ost.rst create mode 100644 drivers/hwtracing/stm/p_ost.c diff --git a/Documentation/ABI/testing/configfs-stp-policy-p_ost b/Documentation/ABI/testing/configfs-stp-policy-p_ost new file mode 100644 index 000000000000..7ad11ae21760 --- /dev/null +++ b/Documentation/ABI/testing/configfs-stp-policy-p_ost @@ -0,0 +1,13 @@ +What: /config/stp-policy/:p_ost.//entity_available +Date: April 2023 +KernelVersion: 6.3 +Description: + Show entity that p_ost supports, RO. + +What: /config/stp-policy/:p_ost.//entity +Date: April 2023 +KernelVersion: 6.3 +Description: + Set the entity which is to identify the source, RW. + The available entity can be gotten by reading entity_available. + diff --git a/Documentation/trace/p_ost.rst b/Documentation/trace/p_ost.rst new file mode 100644 index 000000000000..8d7afa341b9e --- /dev/null +++ b/Documentation/trace/p_ost.rst @@ -0,0 +1,40 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=================== +MIPI OST over STP +=================== + +The OST(Open System Trace) driver is used with STM class devices to +generate standardized trace stream. Trace sources can be identified +by different entity ids. + +CONFIG_STM_PROTO_OST is for p_ost driver enablement. Once this config +is enabled, you can select the p_ost protocol by command below: + +# mkdir /sys/kernel/config/stp-policy/stm0:p_ost.policy + +The policy name format is extended like this: + :. + +With coresight-stm device, it will be look like "stm0:p_ost.policy". + +You can check if the protocol is set successfully by: +# cat /sys/kernel/config/stp-policy/stm0:p_ost.policy/protocol +p_ost + +With MIPI OST protocol driver, the attributes for each protocol node is: +# mkdir /sys/kernel/config/stp-policy/stm0:p_ost.policy/default +# ls /sys/kernel/config/stp-policy/stm0:p_ost.policy/default +channels entity masters + +The entity here is the set the entity that p_ost supports. Currently +p_ost supports ftrace and console entity. + +Get current available entity that p_ost supports: +# cat /sys/kernel/config/stp-policy/stm0:p_ost.policy/default/entity_available +ftrace console + +Set entity: +# echo 'ftrace' > /sys/kernel/config/stp-policy/stm0:p_ost.policy/default/entity + +See Documentation/ABI/testing/configfs-stp-policy-p_ost for more details. diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig index eda6b11d40a1..daa4aa09f64d 100644 --- a/drivers/hwtracing/stm/Kconfig +++ b/drivers/hwtracing/stm/Kconfig @@ -40,6 +40,20 @@ config STM_PROTO_SYS_T If you don't know what this is, say N. +config STM_PROTO_OST + tristate "MIPI OST STM framing protocol driver" + default CONFIG_STM + help + This is an implementation of MIPI OST protocol to be used + over the STP transport. In addition to the data payload, it + also carries additional metadata for entity, better + means of trace source identification, etc. + + The receiving side must be able to decode this protocol in + addition to the MIPI STP, in order to extract the data. + + If you don't know what this is, say N. + config STM_DUMMY tristate "Dummy STM driver" help diff --git a/drivers/hwtracing/stm/Makefile b/drivers/hwtracing/stm/Makefile index 1692fcd29277..715fc721891e 100644 --- a/drivers/hwtracing/stm/Makefile +++ b/drivers/hwtracing/stm/Makefile @@ -5,9 +5,11 @@ stm_core-y := core.o policy.o obj-$(CONFIG_STM_PROTO_BASIC) += stm_p_basic.o obj-$(CONFIG_STM_PROTO_SYS_T) += stm_p_sys-t.o +obj-$(CONFIG_STM_PROTO_OST) += stm_p_ost.o stm_p_basic-y := p_basic.o stm_p_sys-t-y := p_sys-t.o +stm_p_ost-y := p_ost.o obj-$(CONFIG_STM_DUMMY) += dummy_stm.o diff --git a/drivers/hwtracing/stm/p_ost.c b/drivers/hwtracing/stm/p_ost.c new file mode 100644 index 000000000000..fe99b68569d3 --- /dev/null +++ b/drivers/hwtracing/stm/p_ost.c @@ -0,0 +1,213 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. + * + * MIPI OST framing protocol for STM devices. + */ + +#include +#include +#include +#include +#include +#include "stm.h" + + +#define OST_TOKEN_STARTSIMPLE (0x10) +#define OST_VERSION_MIPI1 (0x10 << 8) + +/* entity id to identify the source*/ +#define OST_ENTITY_FTRACE (0x01 << 16) +#define OST_ENTITY_CONSOLE (0x02 << 16) + +#define OST_CONTROL_PROTOCOL (0x0 << 24) + +/* + * OST Base Protocol Header + * + * Position Bits Field Name + * 0 8 STARTSIMPLE + * 1 8 Version + * 2 8 Entity ID + * 3 8 protocol ID + */ +#define DATA_HEADER (OST_TOKEN_STARTSIMPLE | OST_VERSION_MIPI1 | \ + OST_CONTROL_PROTOCOL) + +#define STM_MAKE_VERSION(ma, mi) ((ma << 8) | mi) +#define STM_HEADER_MAGIC (0x5953) + +enum ost_entity_type { + OST_ENTITY_TYPE_NONE, + OST_ENTITY_TYPE_FTRACE, + OST_ENTITY_TYPE_CONSOLE, +}; + +static const char * const str_ost_entity_type[] = { + [OST_ENTITY_TYPE_NONE] = "none", + [OST_ENTITY_TYPE_FTRACE] = "ftrace", + [OST_ENTITY_TYPE_CONSOLE] = "console", +}; + +struct ost_policy_node { + enum ost_entity_type entity_type; +}; + +struct ost_output { + struct ost_policy_node node; +}; + +/* Set default entity type as none */ +static void ost_policy_node_init(void *priv) +{ + struct ost_policy_node *pn = priv; + + pn->entity_type = OST_ENTITY_TYPE_NONE; +} + +static int ost_output_open(void *priv, struct stm_output *output) +{ + struct ost_policy_node *pn = priv; + struct ost_output *opriv; + + opriv = kzalloc(sizeof(*opriv), GFP_ATOMIC); + if (!opriv) + return -ENOMEM; + + memcpy(&opriv->node, pn, sizeof(opriv->node)); + output->pdrv_private = opriv; + return 0; +} + +static void ost_output_close(struct stm_output *output) +{ + kfree(output->pdrv_private); +} + +static ssize_t ost_t_policy_entity_show(struct config_item *item, + char *page) +{ + struct ost_policy_node *pn = to_pdrv_policy_node(item); + + return scnprintf(page, PAGE_SIZE, "%s\n", + str_ost_entity_type[pn->entity_type]); +} + +static ssize_t +ost_t_policy_entity_store(struct config_item *item, const char *page, + size_t count) +{ + struct mutex *mutexp = &item->ci_group->cg_subsys->su_mutex; + struct ost_policy_node *pn = to_pdrv_policy_node(item); + char str[10] = ""; + + mutex_lock(mutexp); + if (sscanf(page, "%s", str) != 1) + return -EINVAL; + mutex_unlock(mutexp); + + if (!strcmp(str, str_ost_entity_type[OST_ENTITY_TYPE_FTRACE])) + pn->entity_type = OST_ENTITY_TYPE_FTRACE; + else if (!strcmp(str, str_ost_entity_type[OST_ENTITY_TYPE_CONSOLE])) + pn->entity_type = OST_ENTITY_TYPE_CONSOLE; + else + return -EINVAL; + return count; +} +CONFIGFS_ATTR(ost_t_policy_, entity); + +static ssize_t ost_t_policy_entity_available_show(struct config_item *item, + char *page) +{ + return scnprintf(page, PAGE_SIZE, "%s\n", "ftrace console"); +} +CONFIGFS_ATTR_RO(ost_t_policy_, entity_available); + +static struct configfs_attribute *ost_t_policy_attrs[] = { + &ost_t_policy_attr_entity, + &ost_t_policy_attr_entity_available, + NULL, +}; + +static ssize_t notrace ost_write(struct stm_data *data, + struct stm_output *output, unsigned int chan, + const char *buf, size_t count) +{ + unsigned int c = output->channel + chan; + unsigned int m = output->master; + const unsigned char nil = 0; + u32 header = DATA_HEADER; + u8 trc_hdr[16]; + ssize_t sz; + + struct ost_output *op = output->pdrv_private; + + /* + * Identify the source by entity type. + * If entity type is not set, return error value. + */ + if (op->node.entity_type == OST_ENTITY_TYPE_FTRACE) { + header |= OST_ENTITY_FTRACE; + } else if (op->node.entity_type == OST_ENTITY_TYPE_CONSOLE) { + header |= OST_ENTITY_CONSOLE; + } else { + pr_debug("p_ost: Entity must be set for trace data."); + return -EINVAL; + } + + /* + * STP framing rules for OST frames: + * * the first packet of the OST frame is marked; + * * the last packet is a FLAG with timestamped tag. + */ + /* Message layout: HEADER / DATA / TAIL */ + /* HEADER */ + sz = data->packet(data, m, c, STP_PACKET_DATA, STP_PACKET_MARKED, + 4, (u8 *)&header); + if (sz <= 0) + return sz; + + /* DATA */ + *(u16 *)(trc_hdr) = STM_MAKE_VERSION(0, 4); + *(u16 *)(trc_hdr + 2) = STM_HEADER_MAGIC; + *(u32 *)(trc_hdr + 4) = raw_smp_processor_id(); + *(u64 *)(trc_hdr + 8) = task_tgid_nr(get_current()); + sz = stm_data_write(data, m, c, false, trc_hdr, sizeof(trc_hdr)); + if (sz <= 0) + return sz; + + sz = stm_data_write(data, m, c, false, buf, count); + + /* TAIL */ + if (sz > 0) + data->packet(data, m, c, STP_PACKET_FLAG, + STP_PACKET_TIMESTAMPED, 0, &nil); + + return sz; +} + +static const struct stm_protocol_driver ost_pdrv = { + .owner = THIS_MODULE, + .name = "p_ost", + .write = ost_write, + .policy_attr = ost_t_policy_attrs, + .output_open = ost_output_open, + .output_close = ost_output_close, + .policy_node_init = ost_policy_node_init, +}; + +static int ost_stm_init(void) +{ + return stm_register_protocol(&ost_pdrv); +} + +static void ost_stm_exit(void) +{ + stm_unregister_protocol(&ost_pdrv); +} + +module_init(ost_stm_init); +module_exit(ost_stm_exit); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("MIPI Open System Trace STM framing protocol driver");