From patchwork Mon Sep 4 05:05:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Linu Cherian X-Patchwork-Id: 13373477 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E46E6CA0FF3 for ; Mon, 4 Sep 2023 05:07:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=JeR32SHQiF5xiauxKgRtiip+ShMz+cR4KX4Zm68GurE=; b=m5Hn5V06Jf7NtM BOT2Mf3hEJ11i7+lr1q7RmeP/nR8fPK6bwNq0LBbbnd19Z3qLRyEvz+f0tDDzrXE6whxpSODX1Lwf YnelPyYQZztG5KmACYyyFDIuW4VK7FsFul8rEHeLxjOqpg+IUqzqDV+gw/0H/Mrg4u2nryv0XLWA/ NO4zZKRyAqM/HykxS15C0JGL8LH5YXP76+x64WqAPNOsJrtMrQJm0syC/yxUFXaIdNP4fppi4obpH DcLlLODwCWd66BY09P5NX4af9rkSJO2uHTRDCx8/nBo88YIlHY1svgMQZxqHPXB3jPsRfFiCOrEUB qeU6y08CclY7ejxcXbwg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qd1nU-003Koe-0I; Mon, 04 Sep 2023 05:06:48 +0000 Received: from mx0a-0016f401.pphosted.com ([67.231.148.174] helo=mx0b-0016f401.pphosted.com) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qd1nQ-003Knh-0X for linux-arm-kernel@lists.infradead.org; Mon, 04 Sep 2023 05:06:46 +0000 Received: from pps.filterd (m0045849.ppops.net [127.0.0.1]) by mx0a-0016f401.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 383KqLeI003842; Sun, 3 Sep 2023 22:06:35 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marvell.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding : content-type; s=pfpt0220; bh=P58GtJwbnZiBgTheacx7d4uEi0ifViCDBUKDU98TD0c=; b=ecM/Hxj+nfLQ/Fh5EJzFnd/WI6Fi0PmA7H08R8XKAOnsXdujcd7kEnbL7AAf28m5fIIf vATNxWRujp1ryd8j+Ru82v0Y18eUY7eMr6T8ruTEV/HSexcqtsit4lOntBOcXsKjuKdc /b3gOBMv8Sxw7/N9nxyvuS6Mubjx7eMKugRmg4eveQZfoIpduPTtVTBHKGCPc2RWzUWc rwG72lj+v8uIUXoJuR61wwLS7m6VsBqBmd9lgFs+bpO8NTiKwGX4U67Iu2kao7CqQcdz r8QftfFIEGWHgM9zmXz/izCXsATqewhOMw+a8sgZf1d++2fiAfdLQrfAgVVO+PMdFs/Y lA== Received: from dc5-exch01.marvell.com ([199.233.59.181]) by mx0a-0016f401.pphosted.com (PPS) with ESMTPS id 3sv2dp4hry-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Sun, 03 Sep 2023 22:06:35 -0700 Received: from DC5-EXCH02.marvell.com (10.69.176.39) by DC5-EXCH01.marvell.com (10.69.176.38) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Sun, 3 Sep 2023 22:06:33 -0700 Received: from maili.marvell.com (10.69.176.80) by DC5-EXCH02.marvell.com (10.69.176.39) with Microsoft SMTP Server id 15.0.1497.48 via Frontend Transport; Sun, 3 Sep 2023 22:06:33 -0700 Received: from localhost.localdomain (unknown [10.28.34.196]) by maili.marvell.com (Postfix) with ESMTP id 1EB883F7062; Sun, 3 Sep 2023 22:06:28 -0700 (PDT) From: Linu Cherian To: , , , CC: , , , , , , , , , Linu Cherian , Anil Kumar Reddy , Tanmay Jagdale Subject: [RFC PATCH v3 5/7] coresight: tmc: Add support for reading tracedata from previous boot Date: Mon, 4 Sep 2023 10:35:45 +0530 Message-ID: <20230904050548.28047-6-lcherian@marvell.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230904050548.28047-1-lcherian@marvell.com> References: <20230904050548.28047-1-lcherian@marvell.com> MIME-Version: 1.0 X-Proofpoint-ORIG-GUID: 38hY_PgcRncz7bI137P3SZJzKptJS2kU X-Proofpoint-GUID: 38hY_PgcRncz7bI137P3SZJzKptJS2kU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.957,Hydra:6.0.601,FMLib:17.11.176.26 definitions=2023-09-04_02,2023-08-31_01,2023-05-22_02 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230903_220644_211256_8D60ECF5 X-CRM114-Status: GOOD ( 28.44 ) 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 * Introduce a new mode CS_MODE_READ_PREVBOOT for reading tracedata captured in previous boot. * Add special handlers for preparing ETR/ETF for this special mode * User can read the trace data as below For example, for reading trace data from tmc_etf sink 1. cd /sys/bus/coresight/devices/tmc_etfXX/ 2. Change mode to READ_PREVBOOT #echo 1 > read_prevboot 3. Dump trace buffer data to a file, #dd if=/dev/tmc_etrXX of=~/cstrace.bin 4. Reset back to normal mode #echo 0 > read_prevboot Signed-off-by: Anil Kumar Reddy Signed-off-by: Tanmay Jagdale Signed-off-by: Linu Cherian --- .../coresight/coresight-etm4x-core.c | 1 + .../hwtracing/coresight/coresight-tmc-core.c | 81 +++++++++- .../hwtracing/coresight/coresight-tmc-etf.c | 62 ++++++++ .../hwtracing/coresight/coresight-tmc-etr.c | 140 +++++++++++++++++- drivers/hwtracing/coresight/coresight-tmc.h | 6 + include/linux/coresight.h | 13 ++ 6 files changed, 301 insertions(+), 2 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c index 7e307022303a..7c65d152aebb 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c @@ -1001,6 +1001,7 @@ static void etm4_disable(struct coresight_device *csdev, switch (mode) { case CS_MODE_DISABLED: + case CS_MODE_READ_PREVBOOT: break; case CS_MODE_SYSFS: etm4_disable_sysfs(csdev); diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c index d69da50136ec..76dde0292b92 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-core.c +++ b/drivers/hwtracing/coresight/coresight-tmc-core.c @@ -103,6 +103,45 @@ u32 tmc_get_memwidth_mask(struct tmc_drvdata *drvdata) return mask; } +int tmc_read_prepare_prevboot(struct tmc_drvdata *drvdata) +{ + int ret = 0; + struct tmc_register_snapshot *reg_ptr; + struct coresight_device *csdev = drvdata->csdev; + + if (!drvdata->metadata.vaddr) { + ret = -ENOMEM; + goto out; + } + + reg_ptr = drvdata->metadata.vaddr; + if (!reg_ptr->valid) { + dev_err(&drvdata->csdev->dev, + "Invalid metadata captured from previous boot\n"); + ret = -EINVAL; + goto out; + } + + /* Sink specific prevboot mode preparation */ + ret = prevboot_ops(csdev)->prepare(csdev); + if (ret) + goto out; + + if (reg_ptr->sts & 0x1) + coresight_insert_barrier_packet(drvdata->buf); + +out: + return ret; +} + +int tmc_read_unprepare_prevboot(struct tmc_drvdata *drvdata) +{ + struct coresight_device *csdev = drvdata->csdev; + + /* Sink specific prevboot mode preparation */ + return prevboot_ops(csdev)->unprepare(csdev); +} + static int tmc_read_prepare(struct tmc_drvdata *drvdata) { int ret = 0; @@ -153,6 +192,10 @@ static int tmc_open(struct inode *inode, struct file *file) struct tmc_drvdata *drvdata = container_of(file->private_data, struct tmc_drvdata, miscdev); + /* Advertise if we are opening with a special mode */ + if (drvdata->mode == CS_MODE_READ_PREVBOOT) + dev_dbg(&drvdata->csdev->dev, "TMC read mode for previous boot\n"); + ret = tmc_read_prepare(drvdata); if (ret) return ret; @@ -331,9 +374,44 @@ static ssize_t buffer_size_store(struct device *dev, static DEVICE_ATTR_RW(buffer_size); +static ssize_t read_prevboot_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent); + + return sprintf(buf, "%#x\n", (drvdata->mode == CS_MODE_READ_PREVBOOT)); +} + +static ssize_t read_prevboot_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t size) +{ + int ret; + unsigned long val, flags; + struct tmc_drvdata *drvdata = dev_get_drvdata(dev->parent); + + ret = kstrtoul(buf, 0, &val); + if (ret) + return ret; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + if (val && (drvdata->mode == CS_MODE_DISABLED)) + drvdata->mode = CS_MODE_READ_PREVBOOT; + else if (!val && (drvdata->mode == CS_MODE_READ_PREVBOOT)) + drvdata->mode = CS_MODE_DISABLED; + + spin_unlock_irqrestore(&drvdata->spinlock, flags); + + return size; +} + +static DEVICE_ATTR_RW(read_prevboot); + static struct attribute *coresight_tmc_attrs[] = { &dev_attr_trigger_cntr.attr, &dev_attr_buffer_size.attr, + &dev_attr_read_prevboot.attr, NULL, }; @@ -623,7 +701,8 @@ static void tmc_shutdown(struct amba_device *adev) spin_lock_irqsave(&drvdata->spinlock, flags); - if (drvdata->mode == CS_MODE_DISABLED) + if (drvdata->mode == CS_MODE_DISABLED || + drvdata->mode == CS_MODE_READ_PREVBOOT) goto out; if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index 1dfaa3ccfff7..fd883e579141 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -639,6 +639,45 @@ static int tmc_panic_sync_etf(struct coresight_device *csdev) return 0; } +static int tmc_etb_setup_prevboot_buf(struct tmc_drvdata *drvdata) +{ + struct tmc_register_snapshot *reg_ptr; + + reg_ptr = drvdata->metadata.vaddr; + + drvdata->buf = memremap(reg_ptr->trc_paddr, reg_ptr->size, + MEMREMAP_WB); + if (IS_ERR(drvdata->buf)) + return -ENOMEM; + drvdata->len = reg_ptr->size; + return 0; +} + +static void tmc_etb_free_prevboot_buf(struct tmc_drvdata *drvdata) +{ + void *buf = drvdata->buf; + + if (!buf) + return; + memunmap(buf); + drvdata->buf = NULL; +} + +static int tmc_etb_prepare_prevboot(struct coresight_device *csdev) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + return tmc_etb_setup_prevboot_buf(drvdata); +} + +static int tmc_etb_unprepare_prevboot(struct coresight_device *csdev) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + tmc_etb_free_prevboot_buf(drvdata); + return 0; +} + static const struct coresight_ops_sink tmc_etf_sink_ops = { .enable = tmc_enable_etf_sink, .disable = tmc_disable_etf_sink, @@ -656,6 +695,11 @@ static const struct coresight_ops_panic tmc_etf_sync_ops = { .sync = tmc_panic_sync_etf, }; +static const struct coresight_ops_prevboot tmc_etf_prevboot_ops = { + .prepare = tmc_etb_prepare_prevboot, + .unprepare = tmc_etb_unprepare_prevboot, +}; + const struct coresight_ops tmc_etb_cs_ops = { .sink_ops = &tmc_etf_sink_ops, }; @@ -664,6 +708,7 @@ const struct coresight_ops tmc_etf_cs_ops = { .sink_ops = &tmc_etf_sink_ops, .link_ops = &tmc_etf_link_ops, .panic_ops = &tmc_etf_sync_ops, + .prevboot_ops = &tmc_etf_prevboot_ops, }; int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) @@ -684,6 +729,14 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) goto out; } + if (drvdata->mode == CS_MODE_READ_PREVBOOT) { + ret = tmc_read_prepare_prevboot(drvdata); + if (ret) + goto out; + else + goto mode_valid; + } + /* Don't interfere if operated from Perf */ if (drvdata->mode == CS_MODE_PERF) { ret = -EINVAL; @@ -707,6 +760,7 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata) __tmc_etb_disable_hw(drvdata); } +mode_valid: drvdata->reading = true; out: spin_unlock_irqrestore(&drvdata->spinlock, flags); @@ -726,8 +780,16 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata) drvdata->config_type != TMC_CONFIG_TYPE_ETF)) return -EINVAL; + spin_lock_irqsave(&drvdata->spinlock, flags); + if (drvdata->mode == CS_MODE_READ_PREVBOOT) { + tmc_read_unprepare_prevboot(drvdata); + drvdata->reading = false; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return 0; + } + /* Re-enable the TMC if need be */ if (drvdata->mode == CS_MODE_SYSFS) { /* There is no point in reading a TMC in HW FIFO mode */ diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 1983a6772775..7fe5d70a393a 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -1151,7 +1151,12 @@ ssize_t tmc_etr_get_sysfs_trace(struct tmc_drvdata *drvdata, { s64 offset; ssize_t actual = len; - struct etr_buf *etr_buf = drvdata->sysfs_buf; + struct etr_buf *etr_buf; + + if (drvdata->mode == CS_MODE_READ_PREVBOOT) + etr_buf = drvdata->prevboot_buf; + else + etr_buf = drvdata->sysfs_buf; if (pos + actual > etr_buf->len) actual = etr_buf->len - pos; @@ -1850,6 +1855,116 @@ static int tmc_panic_sync_etr(struct coresight_device *csdev) return 0; } +static int tmc_etr_setup_prevboot_buf(struct tmc_drvdata *drvdata) +{ + int rc = 0; + u64 trace_addr; + struct etr_buf *etr_buf; + struct etr_flat_buf *resrv_buf; + struct tmc_register_snapshot *reg_ptr; + + etr_buf = kzalloc(sizeof(*etr_buf), GFP_KERNEL); + if (!etr_buf) { + rc = -ENOMEM; + goto out; + } + etr_buf->size = drvdata->resrv_buf.size; + + resrv_buf = kzalloc(sizeof(*resrv_buf), GFP_KERNEL); + if (!resrv_buf) { + rc = -ENOMEM; + goto rmem_err; + } + + reg_ptr = drvdata->metadata.vaddr; + trace_addr = reg_ptr->trc_paddr; + + resrv_buf->vaddr = memremap(trace_addr, reg_ptr->size * 4, + MEMREMAP_WB); + if (IS_ERR(drvdata->buf)) { + rc = -ENOMEM; + goto map_err; + } + resrv_buf->size = etr_buf->size; + resrv_buf->dev = &drvdata->csdev->dev; + etr_buf->hwaddr = trace_addr; + etr_buf->mode = ETR_MODE_RESRV; + etr_buf->private = resrv_buf; + etr_buf->ops = etr_buf_ops[ETR_MODE_RESRV]; + + drvdata->prevboot_buf = etr_buf; + + return 0; + +map_err: + kfree(resrv_buf); + +rmem_err: + kfree(etr_buf); + +out: + return rc; +} + +static int tmc_etr_sync_prevboot_buf(struct tmc_drvdata *drvdata) +{ + u32 status; + u64 rrp, rwp, dba; + struct tmc_register_snapshot *reg_ptr; + struct etr_buf *etr_buf = drvdata->prevboot_buf; + + reg_ptr = drvdata->metadata.vaddr; + + rrp = reg_ptr->rrp; + rwp = reg_ptr->rwp; + dba = reg_ptr->dba; + status = reg_ptr->sts; + + etr_buf->full = !!(status & TMC_STS_FULL); + + /* Sync the buffer pointers */ + etr_buf->offset = rrp - dba; + if (etr_buf->full) + etr_buf->len = etr_buf->size; + else + etr_buf->len = rwp - rrp; + + return 0; +} + +static void tmc_etr_free_prevboot_buf(struct tmc_drvdata *drvdata) +{ + void *buf = drvdata->prevboot_buf; + + if (!buf) + return; + + memunmap(buf); + drvdata->prevboot_buf = NULL; +} + +static int tmc_etr_prepare_prevboot(struct coresight_device *csdev) +{ + int ret = 0; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + ret = tmc_etr_setup_prevboot_buf(drvdata); + if (ret) + goto out; + tmc_etr_sync_prevboot_buf(drvdata); + +out: + return ret; +} + +static int tmc_etr_unprepare_prevboot(struct coresight_device *csdev) +{ + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + tmc_etr_free_prevboot_buf(drvdata); + return 0; +} + static const struct coresight_ops_sink tmc_etr_sink_ops = { .enable = tmc_enable_etr_sink, .disable = tmc_disable_etr_sink, @@ -1862,9 +1977,15 @@ static const struct coresight_ops_panic tmc_etr_sync_ops = { .sync = tmc_panic_sync_etr, }; +static const struct coresight_ops_prevboot tmc_etr_prevboot_ops = { + .prepare = tmc_etr_prepare_prevboot, + .unprepare = tmc_etr_unprepare_prevboot, +}; + const struct coresight_ops tmc_etr_cs_ops = { .sink_ops = &tmc_etr_sink_ops, .panic_ops = &tmc_etr_sync_ops, + .prevboot_ops = &tmc_etr_prevboot_ops, }; int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) @@ -1876,12 +1997,21 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR)) return -EINVAL; + spin_lock_irqsave(&drvdata->spinlock, flags); if (drvdata->reading) { ret = -EBUSY; goto out; } + if (drvdata->mode == CS_MODE_READ_PREVBOOT) { + ret = tmc_read_prepare_prevboot(drvdata); + if (ret) + goto out; + else + goto mode_valid; + } + /* * We can safely allow reads even if the ETR is operating in PERF mode, * since the sysfs session is captured in mode specific data. @@ -1896,6 +2026,7 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata) if (drvdata->mode == CS_MODE_SYSFS) __tmc_etr_disable_hw(drvdata); +mode_valid: drvdata->reading = true; out: spin_unlock_irqrestore(&drvdata->spinlock, flags); @@ -1914,6 +2045,13 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata) spin_lock_irqsave(&drvdata->spinlock, flags); + if (drvdata->mode == CS_MODE_READ_PREVBOOT) { + tmc_read_unprepare_prevboot(drvdata); + drvdata->reading = false; + spin_unlock_irqrestore(&drvdata->spinlock, flags); + return 0; + } + /* RE-enable the TMC if need be */ if (drvdata->mode == CS_MODE_SYSFS) { /* diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h index af93d3ce0e78..a95ba0a8ed93 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.h +++ b/drivers/hwtracing/coresight/coresight-tmc.h @@ -213,6 +213,9 @@ struct tmc_resrv_buf { * @idr_mutex: Access serialisation for idr. * @sysfs_buf: SYSFS buffer for ETR. * @perf_buf: PERF buffer for ETR. + * @prevboot_buf: Previous boot buffer for ETR. This is a special purpose + * buffer that is used only for mapping the trace buffer from + * previous boot and not for capturing trace. * @resrv_buf: Reserved Memory for trace data buffer. Used by ETR/ETF. * @metadata: Reserved memory for metadata. Used by ETR/ETF. */ @@ -240,6 +243,7 @@ struct tmc_drvdata { struct mutex idr_mutex; struct etr_buf *sysfs_buf; struct etr_buf *perf_buf; + struct etr_buf *prevboot_buf; struct tmc_resrv_buf resrv_buf; struct tmc_resrv_buf metadata; }; @@ -291,6 +295,8 @@ void tmc_flush_and_stop(struct tmc_drvdata *drvdata); void tmc_enable_hw(struct tmc_drvdata *drvdata); void tmc_disable_hw(struct tmc_drvdata *drvdata); u32 tmc_get_memwidth_mask(struct tmc_drvdata *drvdata); +int tmc_read_prepare_prevboot(struct tmc_drvdata *drvdata); +int tmc_read_unprepare_prevboot(struct tmc_drvdata *drvdata); /* ETB/ETF functions */ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata); diff --git a/include/linux/coresight.h b/include/linux/coresight.h index 09978ea6abe1..699a433261c9 100644 --- a/include/linux/coresight.h +++ b/include/linux/coresight.h @@ -292,6 +292,7 @@ enum cs_mode { CS_MODE_DISABLED, CS_MODE_SYSFS, CS_MODE_PERF, + CS_MODE_READ_PREVBOOT, /* Trace data from previous boot */ }; #define source_ops(csdev) csdev->ops->source_ops @@ -300,6 +301,7 @@ enum cs_mode { #define helper_ops(csdev) csdev->ops->helper_ops #define ect_ops(csdev) csdev->ops->ect_ops #define panic_ops(csdev) csdev->ops->panic_ops +#define prevboot_ops(csdev) csdev->ops->prevboot_ops /** * struct coresight_ops_sink - basic operations for a sink @@ -379,12 +381,23 @@ struct coresight_ops_panic { int (*sync)(struct coresight_device *csdev); }; +/** + * struct coresight_ops_prevboot - Generic device ops for prevboot mode + * + * @prepare : Preparation for prevboot mode + */ +struct coresight_ops_prevboot { + int (*prepare)(struct coresight_device *csdev); + int (*unprepare)(struct coresight_device *csdev); +}; + struct coresight_ops { const struct coresight_ops_sink *sink_ops; const struct coresight_ops_link *link_ops; const struct coresight_ops_source *source_ops; const struct coresight_ops_helper *helper_ops; const struct coresight_ops_panic *panic_ops; + const struct coresight_ops_prevboot *prevboot_ops; }; #if IS_ENABLED(CONFIG_CORESIGHT)