From patchwork Fri Oct 8 18:29:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Suzuki K Poulose X-Patchwork-Id: 12546171 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 06937C433EF for ; Fri, 8 Oct 2021 18:33:54 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id CD1ED60F02 for ; Fri, 8 Oct 2021 18:33:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org CD1ED60F02 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org 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=baNakAWHi33rwyp/yVQczkXWtytRY+acrnpPOOTg6Bg=; b=ILbMfsOL8D2SkM 3aD0laJOPhVGg8icI6+DXqiWUiDRBWtMykHtU2NFXXhefNpsRvvoI8Z0M347R5ARkReZK7TfTbbGR PIskDvngoEtFE3TT09fdDAb7e+U/nGfbWn+Ur2pxkKsJenTJeRyCUVa094eZtaR1igGbjem+w0Xjx INggWO2VmF768G42soBmN0cf70ogwXvT6DEMQ7ltVll8YfqdNod9kp5pqrWKsrpDVfDF4AmQpNcDi TRaEojFzue7Fz6a8c+5CibgiqnD2y5EoADvjmQnq/I/wv21JovViq2fv78RLsfgKm5oY++KUMKKlI 7MiSfu3YNQBvQITOxlYw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mYufH-003oRl-D1; Fri, 08 Oct 2021 18:32:15 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mYuco-003n6v-Lq for linux-arm-kernel@lists.infradead.org; Fri, 08 Oct 2021 18:29:44 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1284A11FB; Fri, 8 Oct 2021 11:29:42 -0700 (PDT) Received: from ewhatever.cambridge.arm.com (ewhatever.cambridge.arm.com [10.1.197.1]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 4D36D3F766; Fri, 8 Oct 2021 11:29:40 -0700 (PDT) From: Suzuki K Poulose To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, will@kernel.org, catalin.marinas@arm.com, mathieu.poirier@linaro.org, mike.leach@linaro.org, leo.yan@linaro.org, anshuman.khandual@arm.com, coresight@lists.linaro.org, maz@kernel.org, james.morse@arm.com, mark.rutland@arm.com, lcherian@marvell.com, Suzuki K Poulose Subject: [PATCH v3 11/16] coresight: trbe: Add a helper to determine the minimum buffer size Date: Fri, 8 Oct 2021 19:29:01 +0100 Message-Id: <20211008182906.1688009-12-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20211008182906.1688009-1-suzuki.poulose@arm.com> References: <20211008182906.1688009-1-suzuki.poulose@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211008_112942_783765_9B938084 X-CRM114-Status: GOOD ( 10.93 ) 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 For the TRBE to operate, we need a minimum space available to collect meaningful trace session. This is currently a few bytes, but we may need to extend this for working around errata. So, abstract this into a helper function. Cc: Anshuman Khandual Cc: Mike Leach Cc: Mathieu Poirier Cc: Leo Yan Reviewed-by: Anshuman Khandual Reviewed-by: Mathieu Poirier Signed-off-by: Suzuki K Poulose --- drivers/hwtracing/coresight/coresight-trbe.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c index 2a1656902836..c2ab4351e80b 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.c +++ b/drivers/hwtracing/coresight/coresight-trbe.c @@ -303,6 +303,11 @@ static unsigned long trbe_snapshot_offset(struct perf_output_handle *handle) return buf->nr_pages * PAGE_SIZE; } +static u64 trbe_min_trace_buf_size(struct perf_output_handle *handle) +{ + return TRBE_TRACE_MIN_BUF_SIZE; +} + /* * TRBE Limit Calculation * @@ -473,7 +478,7 @@ static unsigned long trbe_normal_offset(struct perf_output_handle *handle) * have space for a meaningful run, we rather pad it * and start fresh. */ - if (limit && (limit - head < TRBE_TRACE_MIN_BUF_SIZE)) { + if (limit && ((limit - head) < trbe_min_trace_buf_size(handle))) { trbe_pad_buf(handle, limit - head); limit = __trbe_normal_offset(handle); }