From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1522379765; cv=none; d=google.com; s=arc-20160816; b=uoywexZdUzqjJNbWTcoW/VlEZln6N+3wzFwbGsfcG4fdKjxf3nGAk/MgJapdTCKNsk 8muUv9F1Q1EL0TCwyXmelGyWNJ4sc5U2NA1c0QIo4YKCuP9FZbIwyo4MnDZjxaQhlmVp okTyvdYra+Igfmz5O8FpZjnpEujgvzM9X6lbwH12qmN7EC0maPeTI30TQkfNsaWqKfwq v+KQJGsnpfpPIBmQLFsuos4mwyo2WgtLr2G6xsfpyKdWjiwAZ1ErrTs4Qzisa/YmM3Y2 7OJEqaV4dp0w0tAyhBnRaFhBjIgGnAwOwTx4SJfvhcIqMoS4C9Gk9UywLBL0x7b/VcQ5 FugQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:arc-authentication-results; bh=HpmWK/7Q87q15GSW6+wUQSscqm4fAYVRmYYCeuwbnNw=; b=dPWitcs6gAh05RWs7DHA6cQtwQIqzrGAa29OZY0dFMhQdMfjjPJ7JBkm4wPJC9VY0m tJvo7Co/peBJQXBXjg2LCCfX7lsj49lStaUAjuBDs1RrmuKDmt62yCOia9t2vJbsiT5J UfxKixC4oqH2qtI1oLVZ32sq77tVkMdYPqf9T/gKgSBTdhaPe28h4sA2c/C/gsXcW1MX DGJ89WQlwJ89uiX4Qtfey7y/p+5H1v7P+pt93yMkVpgvLi7Xk+/QTqEU46FfKybuyqHE ZZKmXXtqq/Pkr66vH9sTXIYnKH+iYatM7JZrCvLv5bp+PGKDD1wwrw0XdaU8eP0ym/nl 5Rzg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=XMsb5V8m; spf=pass (google.com: domain of leo.yan@linaro.org designates 209.85.220.65 as permitted sender) smtp.mailfrom=leo.yan@linaro.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=XMsb5V8m; spf=pass (google.com: domain of leo.yan@linaro.org designates 209.85.220.65 as permitted sender) smtp.mailfrom=leo.yan@linaro.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org X-Google-Smtp-Source: AIpwx4+gbi+82S56f0PFR9nTXThbF/t6iDlzni03R5NrGl4GoNtgK6L2tafQ90olVPp0zhTir1280A== From: Leo Yan To: Jonathan Corbet , Mathieu Poirier , Greg Kroah-Hartman , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, coresight@lists.linaro.org, Kim Phillips , Mike Leach Cc: Leo Yan Subject: [PATCH v4 4/6] coresight: tmc: Hook callback for panic kdump Date: Fri, 30 Mar 2018 11:15:22 +0800 Message-Id: <1522379724-30648-5-git-send-email-leo.yan@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1522379724-30648-1-git-send-email-leo.yan@linaro.org> References: <1522379724-30648-1-git-send-email-leo.yan@linaro.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1596330884321271490?= X-GMAIL-MSGID: =?utf-8?q?1596330884321271490?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Since Coresight panic kdump functionality has been ready, this patch is to hook panic callback function for ETB/ETF driver. The driver data structure has allocated a buffer when the session started, so simply save tracing data into this buffer when panic happens and update buffer related info for kdump. Signed-off-by: Leo Yan --- drivers/hwtracing/coresight/coresight-tmc-etf.c | 30 +++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index e2513b7..d20d546 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -504,6 +504,35 @@ static void tmc_update_etf_buffer(struct coresight_device *csdev, CS_LOCK(drvdata->base); } +static void tmc_panic_cb(void *data) +{ + struct coresight_device *csdev = (struct coresight_device *)data; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + unsigned long flags; + + if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETB && + drvdata->config_type != TMC_CONFIG_TYPE_ETF)) + return; + + if (drvdata->mode == CS_MODE_DISABLED) + return; + + spin_lock_irqsave(&drvdata->spinlock, flags); + + CS_UNLOCK(drvdata->base); + + tmc_flush_and_stop(drvdata); + tmc_etb_dump_hw(drvdata); + + CS_LOCK(drvdata->base); + + /* Update buffer info for panic dump */ + csdev->kdump_buf = drvdata->buf; + csdev->kdump_buf_sz = drvdata->len; + + spin_unlock_irqrestore(&drvdata->spinlock, flags); +} + static const struct coresight_ops_sink tmc_etf_sink_ops = { .enable = tmc_enable_etf_sink, .disable = tmc_disable_etf_sink, @@ -512,6 +541,7 @@ static const struct coresight_ops_sink tmc_etf_sink_ops = { .set_buffer = tmc_set_etf_buffer, .reset_buffer = tmc_reset_etf_buffer, .update_buffer = tmc_update_etf_buffer, + .panic_cb = tmc_panic_cb, }; static const struct coresight_ops_link tmc_etf_link_ops = { -- 2.7.4