From mboxrd@z Thu Jan 1 00:00:00 1970 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 C5139C433F5 for ; Thu, 14 Oct 2021 22:34:38 +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 7B14060E53 for ; Thu, 14 Oct 2021 22:34:38 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 7B14060E53 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=GA8mMZaQMsgdBor+u9aH7v7o+aI57CurFnrNiu6m/kU=; b=O4eBkd4M1GuWiv hYrI05o8PYTKgZsqUTwY5WZVhaKFW2fM2Si013HTZPb8V7XTGxG+q9nEDRXcOR9pM+6cQT3cwUE45 DFP2YFQnBWodPV2BR2ALnGa7LI+M7m44mv6aBO0dcv/RhyS2g2i1oMui9EBTT57OJj7xZLbefP+vg trb8ZS7AegfnlvO02Bq5mGhd2nufsPONQoCUPzgMeYYlLdO4ZxRYZpopcph3C5rBJH+Y1WgFgLXdP XKB2gy64KhL7RZ+Hg1Syv4y01r+p8QHUvR/7dV8XLnUV9qYIHR0RvlncUz9eIaLeq7Q3JO5dQwXOH iEMegzeCfuNS/jeCytsA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mb9Hu-004Voe-KW; Thu, 14 Oct 2021 22:33:22 +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 1mb9GO-004V7Y-En for linux-arm-kernel@lists.infradead.org; Thu, 14 Oct 2021 22:31:50 +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 E5AE214BF; Thu, 14 Oct 2021 15:31:47 -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 7A9C53F694; Thu, 14 Oct 2021 15:31:46 -0700 (PDT) From: Suzuki K Poulose To: will@kernel.org, mathieu.poirier@linaro.org Cc: catalin.marinas@arm.com, anshuman.khandual@arm.com, mike.leach@linaro.org, leo.yan@linaro.org, maz@kernel.org, coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Suzuki K Poulose Subject: [PATCH v5 07/15] coresight: trbe: Decouple buffer base from the hardware base Date: Thu, 14 Oct 2021 23:31:17 +0100 Message-Id: <20211014223125.2605031-8-suzuki.poulose@arm.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20211014223125.2605031-1-suzuki.poulose@arm.com> References: <20211014223125.2605031-1-suzuki.poulose@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211014_153148_644617_B15B4651 X-CRM114-Status: GOOD ( 13.16 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org We always set the TRBBASER_EL1 to the base of the virtual ring buffer. We are about to change this for working around an erratum. So, in preparation to that, allow the driver to choose a different base for the TRBBASER_EL1 (which is within the buffer range). 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 | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c index 3de03136285f..58796ff425a4 100644 --- a/drivers/hwtracing/coresight/coresight-trbe.c +++ b/drivers/hwtracing/coresight/coresight-trbe.c @@ -57,6 +57,8 @@ struct trbe_buf { * trbe_limit sibling pointers. */ unsigned long trbe_base; + /* The base programmed into the TRBE */ + unsigned long trbe_hw_base; unsigned long trbe_limit; unsigned long trbe_write; int nr_pages; @@ -470,12 +472,13 @@ static void set_trbe_limit_pointer_enabled(unsigned long addr) static void trbe_enable_hw(struct trbe_buf *buf) { - WARN_ON(buf->trbe_write < buf->trbe_base); + WARN_ON(buf->trbe_hw_base < buf->trbe_base); + WARN_ON(buf->trbe_write < buf->trbe_hw_base); WARN_ON(buf->trbe_write >= buf->trbe_limit); set_trbe_disabled(); isb(); clr_trbe_status(); - set_trbe_base_pointer(buf->trbe_base); + set_trbe_base_pointer(buf->trbe_hw_base); set_trbe_write_pointer(buf->trbe_write); /* @@ -520,7 +523,12 @@ static unsigned long trbe_get_trace_size(struct perf_output_handle *handle, else write = get_trbe_write_pointer(); - end_off = write - get_trbe_base_pointer(); + /* + * TRBE may use a different base address than the base + * of the ring buffer. Thus use the beginning of the ring + * buffer to compute the offsets. + */ + end_off = write - buf->trbe_base; start_off = PERF_IDX2OFF(handle->head, buf); if (WARN_ON_ONCE(end_off < start_off)) @@ -678,6 +686,8 @@ static int __arm_trbe_enable(struct trbe_buf *buf, trbe_stop_and_truncate_event(handle); return -ENOSPC; } + /* Set the base of the TRBE to the buffer base */ + buf->trbe_hw_base = buf->trbe_base; *this_cpu_ptr(buf->cpudata->drvdata->handle) = handle; trbe_enable_hw(buf); return 0; @@ -771,7 +781,7 @@ static bool is_perf_trbe(struct perf_output_handle *handle) struct trbe_drvdata *drvdata = cpudata->drvdata; int cpu = smp_processor_id(); - WARN_ON(buf->trbe_base != get_trbe_base_pointer()); + WARN_ON(buf->trbe_hw_base != get_trbe_base_pointer()); WARN_ON(buf->trbe_limit != get_trbe_limit_pointer()); if (cpudata->mode != CS_MODE_PERF) -- 2.25.4 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel