From patchwork Tue Mar 22 20:23:21 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Poirier X-Patchwork-Id: 64202 Delivered-To: patch@linaro.org Received: by 10.112.199.169 with SMTP id jl9csp2295268lbc; Tue, 22 Mar 2016 13:25:03 -0700 (PDT) X-Received: by 10.98.33.74 with SMTP id h71mr56507480pfh.157.1458678303119; Tue, 22 Mar 2016 13:25:03 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 76si4399878pfb.3.2016.03.22.13.25.02; Tue, 22 Mar 2016 13:25:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dkim=pass header.i=@linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753108AbcCVUZB (ORCPT + 29 others); Tue, 22 Mar 2016 16:25:01 -0400 Received: from mail-io0-f171.google.com ([209.85.223.171]:32851 "EHLO mail-io0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752749AbcCVUYD (ORCPT ); Tue, 22 Mar 2016 16:24:03 -0400 Received: by mail-io0-f171.google.com with SMTP id c63so75974606iof.0 for ; Tue, 22 Mar 2016 13:24:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=vXz9ZDdcNAbf3N6U7vne1Lik8BoeRw5XxGpqFu9vf+I=; b=GPdhnqscfHU+2SRpqg6Fa20Pac6S76lr1baY5t+zRBkDBwYmaii7XrFX+1vf9//069 UaKGiGS4z77+Df4Nr6zuU4RbrCDNPN6K6v83U3PW1EqBGV/WqWk5k/sQd7RILKcYyZV5 /a8uGe6KiGATcOxeu7W0iJ0FQ3D3LNHqoDTqU= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=vXz9ZDdcNAbf3N6U7vne1Lik8BoeRw5XxGpqFu9vf+I=; b=H2ICfGKFksUC3An/qKgRsq9rkjmSY/iTXCfLyR2EF6G45XpCbM9F0Du3sV9iQMwlA5 dLqVDHwfOw7J/yG9ebSPCa5tyt4WaxVd/IIYHihdZIJw5ufLfLe2wKwAM1C1wP4sPHff U1qmhfYYz/TppkPYvoBLuCp8thffGyy/1SuQzpugLWp1gl1tX7uwStKkx6F+go071XUV QIsuA0pX6wOFKnwifZKbavW3qpCMF0b/pPQPcMqbU/BhX8Jta9Nc1xvi5rULNxNw2wOR ysSNjTJgVdUNW4R5qnh/fUrXxsqhu6L2I0LYairnnLQ8CvVOHU8IcibvB+lqIslN7xG7 RYJw== X-Gm-Message-State: AD7BkJIlF+UBE9jBhoRPgwh2irI5aV2sKAnPhHrIHN+4JzGS3e9RutBj+amL7Gg18EZCSxOO X-Received: by 10.107.136.158 with SMTP id s30mr41567497ioi.109.1458678242408; Tue, 22 Mar 2016 13:24:02 -0700 (PDT) Received: from t430.cg.shawcable.net ([184.64.168.246]) by smtp.gmail.com with ESMTPSA id xo2sm8092061igb.0.2016.03.22.13.24.00 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 22 Mar 2016 13:24:01 -0700 (PDT) From: Mathieu Poirier To: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH 13/14] coresight: tmc: implementing TMC-ETR AUX space API Date: Tue, 22 Mar 2016 14:23:21 -0600 Message-Id: <1458678202-3447-14-git-send-email-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1458678202-3447-1-git-send-email-mathieu.poirier@linaro.org> References: <1458678202-3447-1-git-send-email-mathieu.poirier@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch implement the AUX area interfaces required to use the TMC (configured as an ETR) from the Perf sub-system. The heuristic is heavily borrowed from the ETB10 and TMC-ETF implementation. Signed-off-by: Mathieu Poirier --- drivers/hwtracing/coresight/coresight-tmc-etf.c | 6 +- drivers/hwtracing/coresight/coresight-tmc-etr.c | 141 ++++++++++++++++++++++++ drivers/hwtracing/coresight/coresight-tmc.h | 3 + 3 files changed, 147 insertions(+), 3 deletions(-) -- 2.1.4 diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c index 79762b2c6114..64b4b4f8df12 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c @@ -364,9 +364,9 @@ static unsigned long tmc_reset_etf_buffer(struct coresight_device *csdev, return size; } -static void tmc_update_etf_buffer(struct coresight_device *csdev, - struct perf_output_handle *handle, - void *sink_config) +void tmc_update_etf_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle, + void *sink_config) { int i, cur; u32 *buf_ptr; diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 50a2e0a83714..6ba261277316 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -15,12 +15,30 @@ * this program. If not, see . */ +#include #include #include +#include #include "coresight-priv.h" #include "coresight-tmc.h" +/** + * struct cs_etr_buffer - keep track of a recording session' specifics + * @tmc: generic portion of the TMC buffers + * @paddr: the physical address of a DMA'able contiguous memory area + * @vaddr: the virtual address associated to @paddr + * @size: how much memory we have, starting at @paddr + * @dev: the device @vaddr has been tied to + */ +struct cs_etr_buffers { + struct cs_tmc_buffers tmc; + dma_addr_t paddr; + void __iomem *vaddr; + u32 size; + struct device *dev; +}; + void tmc_etr_enable_hw(struct tmc_drvdata *drvdata) { u32 axictl; @@ -226,9 +244,132 @@ out: dev_info(drvdata->dev, "TMC-ETR disabled\n"); } +static void *tmc_alloc_etr_buffer(struct coresight_device *csdev, int cpu, + void **pages, int nr_pages, bool overwrite) +{ + int node; + struct cs_etr_buffers *buf; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + if (cpu == -1) + cpu = smp_processor_id(); + node = cpu_to_node(cpu); + + /* Allocate memory structure for interaction with Perf */ + buf = kzalloc_node(sizeof(struct cs_etr_buffers), GFP_KERNEL, node); + if (!buf) + return NULL; + + buf->dev = drvdata->dev; + buf->size = drvdata->size; + buf->vaddr = dma_alloc_coherent(buf->dev, buf->size, + &buf->paddr, GFP_KERNEL); + if (!buf->vaddr) { + kfree(buf); + return NULL; + } + + buf->tmc.snapshot = overwrite; + buf->tmc.nr_pages = nr_pages; + buf->tmc.data_pages = pages; + + return buf; +} + +static void tmc_free_etr_buffer(void *config) +{ + struct cs_etr_buffers *buf = config; + + dma_free_coherent(buf->dev, buf->size, buf->vaddr, buf->paddr); + kfree(buf); +} + +static int tmc_set_etr_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle, + void *sink_config) +{ + int ret = 0; + unsigned long head; + struct cs_etr_buffers *buf = sink_config; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + /* wrap head around to the amount of space we have */ + head = handle->head & ((buf->tmc.nr_pages << PAGE_SHIFT) - 1); + + /* find the page to write to */ + buf->tmc.cur = head / PAGE_SIZE; + + /* and offset within that page */ + buf->tmc.offset = head % PAGE_SIZE; + + local_set(&buf->tmc.data_size, 0); + + /* Tell the HW where to put the trace data */ + drvdata->vaddr = buf->vaddr; + drvdata->paddr = buf->paddr; + memset(drvdata->vaddr, 0, drvdata->size); + + return ret; +} + +static unsigned long tmc_reset_etr_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle, + void *sink_config, bool *lost) +{ + unsigned long size = 0; + struct cs_etr_buffers *buf = sink_config; + struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); + + if (buf) { + /* + * In snapshot mode ->data_size holds the new address of the + * ring buffer's head. The size itself is the whole address + * range since we want the latest information. + */ + if (buf->tmc.snapshot) { + size = buf->tmc.nr_pages << PAGE_SHIFT; + handle->head = local_xchg(&buf->tmc.data_size, size); + } + + /* + * Tell the tracer PMU how much we got in this run and if + * something went wrong along the way. Nobody else can use + * this cs_etr_buffers instance until we are done. As such + * resetting parameters here and squaring off with the ring + * buffer API in the tracer PMU is fine. + */ + *lost = !!local_xchg(&buf->tmc.lost, 0); + size = local_xchg(&buf->tmc.data_size, 0); + } + + /* Get ready for another run */ + drvdata->vaddr = NULL; + drvdata->paddr = 0; + + return size; +} + +static void tmc_update_etr_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle, + void *sink_config) +{ + struct cs_etr_buffers *buf = sink_config; + + /* + * An ETR configured to work in contiguous memory mode works the same + * was as an ETB or ETF. + */ + tmc_update_etf_buffer(csdev, handle, &buf->tmc); +} + static const struct coresight_ops_sink tmc_etr_sink_ops = { .enable = tmc_enable_etr_sink, .disable = tmc_disable_etr_sink, + .alloc_buffer = tmc_alloc_etr_buffer, + .free_buffer = tmc_free_etr_buffer, + .set_buffer = tmc_set_etr_buffer, + .reset_buffer = tmc_reset_etr_buffer, + .update_buffer = tmc_update_etr_buffer, }; const struct coresight_ops tmc_etr_cs_ops = { diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h index 3de442f15be7..12f1bd8ccdc9 100644 --- a/drivers/hwtracing/coresight/coresight-tmc.h +++ b/drivers/hwtracing/coresight/coresight-tmc.h @@ -154,6 +154,9 @@ void tmc_disable_hw(struct tmc_drvdata *drvdata); /* ETB/ETF functions */ int tmc_read_prepare_etf(struct tmc_drvdata *drvdata); int tmc_read_unprepare_etf(struct tmc_drvdata *drvdata); +void tmc_update_etf_buffer(struct coresight_device *csdev, + struct perf_output_handle *handle, + void *sink_config); extern const struct coresight_ops tmc_etb_cs_ops; extern const struct coresight_ops tmc_etf_cs_ops;