From patchwork Wed Nov 6 19:22:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pierre-Louis Bossart X-Patchwork-Id: 11230935 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 2625B1709 for ; Wed, 6 Nov 2019 19:27:40 +0000 (UTC) Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (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 A9EF52178F for ; Wed, 6 Nov 2019 19:27:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=alsa-project.org header.i=@alsa-project.org header.b="SryLqzQb" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A9EF52178F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=alsa-devel-bounces@alsa-project.org Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id 0AA971695; Wed, 6 Nov 2019 20:26:47 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz 0AA971695 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1573068457; bh=NHdCJlhpYCfGKD0QWyIP6WFULQgl+yVpaXrfavA8uXQ=; h=From:To:Date:In-Reply-To:References:Cc:Subject:List-Id: List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe: From; b=SryLqzQbMewPzQZQnfb8deWlgw771fnnQArjoqbI0U3BbdOc/0EF2zpGYoOnW/w2B +3yXP5SJZaM47ogZYu0i5ziIkrj+jRAu6LyynpEIIEgwlqXLRLNIXqATfmNSy+I4fL lkwo47F2ZDBbnsGcgkHl3Sg0Kc9KPesq9zk7vQfY= Received: from alsa1.perex.cz (localhost.localdomain [127.0.0.1]) by alsa1.perex.cz (Postfix) with ESMTP id 5A2BCF8063A; Wed, 6 Nov 2019 20:22:41 +0100 (CET) X-Original-To: alsa-devel@alsa-project.org Delivered-To: alsa-devel@alsa-project.org Received: by alsa1.perex.cz (Postfix, from userid 50401) id 08FB9F80633; Wed, 6 Nov 2019 20:22:38 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on alsa1.perex.cz X-Spam-Level: X-Spam-Status: No, score=0.0 required=5.0 tests=SPF_HELO_PASS,SPF_NONE, SURBL_BLOCKED,URIBL_BLOCKED autolearn=disabled version=3.4.0 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa1.perex.cz (Postfix) with ESMTPS id 72594F805FF for ; Wed, 6 Nov 2019 20:22:32 +0100 (CET) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 72594F805FF X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Nov 2019 11:22:31 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.68,275,1569308400"; d="scan'208";a="403835068" Received: from vidhipat-mobl1.amr.corp.intel.com (HELO pbossart-mobl3.amr.corp.intel.com) ([10.254.33.70]) by fmsmga006.fm.intel.com with ESMTP; 06 Nov 2019 11:22:29 -0800 From: Pierre-Louis Bossart To: alsa-devel@alsa-project.org Date: Wed, 6 Nov 2019 13:22:05 -0600 Message-Id: <20191106192223.6003-2-pierre-louis.bossart@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191106192223.6003-1-pierre-louis.bossart@linux.intel.com> References: <20191106192223.6003-1-pierre-louis.bossart@linux.intel.com> MIME-Version: 1.0 Cc: Pierre-Louis Bossart , tiwai@suse.de, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, Ranjani Sridharan , vkoul@kernel.org, broonie@kernel.org, srinivas.kandagatla@linaro.org, jank@cadence.com, slawomir.blauciak@intel.com, Sanyog Kale , Bard liao , Rander Wang Subject: [alsa-devel] [PATCH v2 01/19] soundwire: intel/cadence: fix timeouts in MSI mode X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" From: Bard Liao The existing code uses one pair of interrupt handler/thread per link but at the hardware level the interrupt is shared. This works fine for legacy PCI interrupts, but leads to timeouts in MSI (Message-Signaled Interrupt) mode, likely due to edges being lost. This patch unifies interrupt handling for all links with a single threaded IRQ handler. The handler is simplified to the bare minimum of detecting a SoundWire interrupt, and the thread takes care of dealing with interrupt sources. This partition follows the model used for the SOF IPC on HDaudio platforms, where similar timeout issues were noticed and doing all the interrupt handling/clearing in the thread improved reliability/stability. Validation results with 4 links active in parallel show a night-and-day improvement with no timeouts noticed even during stress tests. Latency and quality of service are not affected by the change - mostly because events on a SoundWire link are throttled by the bus frame rate (typically 8..48kHz). Signed-off-by: Bard Liao Signed-off-by: Pierre-Louis Bossart --- drivers/soundwire/cadence_master.c | 17 ++++++----- drivers/soundwire/cadence_master.h | 4 +++ drivers/soundwire/intel.c | 17 +---------- drivers/soundwire/intel.h | 2 ++ drivers/soundwire/intel_init.c | 45 ++++++++++++++++++++++++++++- include/linux/soundwire/sdw_intel.h | 2 ++ 6 files changed, 62 insertions(+), 25 deletions(-) diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c index fed21e2b2277..362fb6e49bfe 100644 --- a/drivers/soundwire/cadence_master.c +++ b/drivers/soundwire/cadence_master.c @@ -17,6 +17,7 @@ #include #include #include +#include #include "bus.h" #include "cadence_master.h" @@ -745,7 +746,7 @@ irqreturn_t sdw_cdns_irq(int irq, void *dev_id) CDNS_MCP_INT_SLAVE_MASK, 0); int_status &= ~CDNS_MCP_INT_SLAVE_MASK; - ret = IRQ_WAKE_THREAD; + schedule_work(&cdns->work); } cdns_writel(cdns, CDNS_MCP_INTSTAT, int_status); @@ -754,13 +755,14 @@ irqreturn_t sdw_cdns_irq(int irq, void *dev_id) EXPORT_SYMBOL(sdw_cdns_irq); /** - * sdw_cdns_thread() - Cadence irq thread handler - * @irq: irq number - * @dev_id: irq context + * To update slave status in a work since we will need to handle + * other interrupts eg. CDNS_MCP_INT_RX_WL during the update slave + * process. */ -irqreturn_t sdw_cdns_thread(int irq, void *dev_id) +static void cdns_update_slave_status_work(struct work_struct *work) { - struct sdw_cdns *cdns = dev_id; + struct sdw_cdns *cdns = + container_of(work, struct sdw_cdns, work); u32 slave0, slave1; dev_dbg_ratelimited(cdns->dev, "Slave status change\n"); @@ -777,9 +779,7 @@ irqreturn_t sdw_cdns_thread(int irq, void *dev_id) cdns_updatel(cdns, CDNS_MCP_INTMASK, CDNS_MCP_INT_SLAVE_MASK, CDNS_MCP_INT_SLAVE_MASK); - return IRQ_HANDLED; } -EXPORT_SYMBOL(sdw_cdns_thread); /* * init routines @@ -1187,6 +1187,7 @@ int sdw_cdns_probe(struct sdw_cdns *cdns) init_completion(&cdns->tx_complete); cdns->bus.port_ops = &cdns_port_ops; + INIT_WORK(&cdns->work, cdns_update_slave_status_work); return 0; } EXPORT_SYMBOL(sdw_cdns_probe); diff --git a/drivers/soundwire/cadence_master.h b/drivers/soundwire/cadence_master.h index 001457cbe5ad..0f108fd31fd9 100644 --- a/drivers/soundwire/cadence_master.h +++ b/drivers/soundwire/cadence_master.h @@ -126,6 +126,10 @@ struct sdw_cdns { bool link_up; unsigned int msg_count; + + struct work_struct work; + + struct list_head list; }; #define bus_to_cdns(_bus) container_of(_bus, struct sdw_cdns, bus) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index cad1c0b64ee3..c918a26d0772 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -1095,6 +1095,7 @@ static int intel_master_probe(struct sdw_master_device *md, void *link_ctx) sdw->cdns.msg_count = 0; sdw->cdns.bus.dev = &md->dev; sdw->cdns.bus.link_id = md->link_id; + sdw->link_res->cdns = &sdw->cdns; sdw_cdns_probe(&sdw->cdns); @@ -1119,21 +1120,7 @@ static int intel_master_probe(struct sdw_master_device *md, void *link_ctx) return 0; } - /* Acquire IRQ */ - ret = request_threaded_irq(sdw->link_res->irq, - sdw_cdns_irq, sdw_cdns_thread, - IRQF_SHARED, KBUILD_MODNAME, &sdw->cdns); - if (ret < 0) { - dev_err(sdw->cdns.dev, "unable to grab IRQ %d, disabling device\n", - sdw->link_res->irq); - goto err_init; - } - return 0; - -err_init: - sdw_delete_bus_master(&sdw->cdns.bus); - return ret; } static int intel_master_startup(struct sdw_master_device *md) @@ -1190,7 +1177,6 @@ static int intel_master_startup(struct sdw_master_device *md) err_interrupt: sdw_cdns_enable_interrupt(&sdw->cdns, false); err_init: - free_irq(sdw->link_res->irq, sdw); sdw_delete_bus_master(&sdw->cdns.bus); return ret; } @@ -1204,7 +1190,6 @@ static int intel_master_remove(struct sdw_master_device *md) if (!sdw->cdns.bus.prop.hw_disabled) { intel_debugfs_exit(sdw); sdw_cdns_enable_interrupt(&sdw->cdns, false); - free_irq(sdw->link_res->irq, sdw); snd_soc_unregister_component(sdw->cdns.dev); } sdw_delete_bus_master(&sdw->cdns.bus); diff --git a/drivers/soundwire/intel.h b/drivers/soundwire/intel.h index cfab2f00214d..2ae4fa748686 100644 --- a/drivers/soundwire/intel.h +++ b/drivers/soundwire/intel.h @@ -25,6 +25,8 @@ struct sdw_intel_link_res { int irq; const struct sdw_intel_ops *ops; struct device *dev; + struct sdw_cdns *cdns; + struct list_head list; }; #define SDW_INTEL_QUIRK_MASK_BUS_DISABLE BIT(1) diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c index 14ffe9ce2929..ed2a83989c72 100644 --- a/drivers/soundwire/intel_init.c +++ b/drivers/soundwire/intel_init.c @@ -11,8 +11,10 @@ #include #include #include +#include #include #include +#include "cadence_master.h" #include "intel.h" #define SDW_LINK_TYPE 4 /* from Intel ACPI documentation */ @@ -161,6 +163,32 @@ void sdw_intel_enable_irq(void __iomem *mmio_base, bool enable) } EXPORT_SYMBOL(sdw_intel_enable_irq); +static irqreturn_t sdw_intel_irq(int irq, void *dev_id) +{ + struct sdw_intel_ctx *ctx = dev_id; + u32 int_status; + + int_status = readl(ctx->mmio_base + HDA_DSP_REG_ADSPIS2); + if (int_status & HDA_DSP_REG_ADSPIC2_SNDW) { + sdw_intel_enable_irq(ctx->mmio_base, false); + return IRQ_WAKE_THREAD; + } + + return IRQ_NONE; +} + +static irqreturn_t sdw_intel_thread(int irq, void *dev_id) +{ + struct sdw_intel_ctx *ctx = dev_id; + struct sdw_intel_link_res *link; + + list_for_each_entry(link, &ctx->link_list, list) + sdw_cdns_irq(irq, link->cdns); + + sdw_intel_enable_irq(ctx->mmio_base, true); + return IRQ_HANDLED; +} + static struct sdw_intel_ctx *sdw_intel_probe_controller(struct sdw_intel_res *res) { @@ -171,6 +199,7 @@ static struct sdw_intel_ctx u32 link_mask; int count; int i; + int ret; if (!res) return NULL; @@ -196,10 +225,13 @@ static struct sdw_intel_ctx ctx->mmio_base = res->mmio_base; ctx->link_mask = res->link_mask; ctx->handle = res->handle; + ctx->irq = res->irq; link = ctx->links; link_mask = ctx->link_mask; + INIT_LIST_HEAD(&ctx->link_list); + /* Create SDW Master devices */ for (i = 0; i < count; i++, link++) { if (link_mask && !(link_mask & BIT(i))) @@ -220,12 +252,22 @@ static struct sdw_intel_ctx + (SDW_LINK_SIZE * i); link->shim = res->mmio_base + SDW_SHIM_BASE; link->alh = res->mmio_base + SDW_ALH_BASE; - link->irq = res->irq; link->ops = res->ops; link->dev = res->dev; /* let the SoundWire master driver to its probe */ md->driver->probe(md, link); + + list_add_tail(&link->list, &ctx->link_list); + } + + ret = request_threaded_irq(ctx->irq, + sdw_intel_irq, sdw_intel_thread, + IRQF_SHARED, KBUILD_MODNAME, ctx); + if (ret < 0) { + dev_err(&adev->dev, "unable to grab IRQ %d, disabling device\n", + res->irq); + goto err; } return ctx; @@ -373,6 +415,7 @@ EXPORT_SYMBOL(sdw_intel_startup); */ void sdw_intel_exit(struct sdw_intel_ctx *ctx) { + free_irq(ctx->irq, ctx); sdw_intel_cleanup(ctx); kfree(ctx); } diff --git a/include/linux/soundwire/sdw_intel.h b/include/linux/soundwire/sdw_intel.h index 36e2b522a749..373947003cea 100644 --- a/include/linux/soundwire/sdw_intel.h +++ b/include/linux/soundwire/sdw_intel.h @@ -94,7 +94,9 @@ struct sdw_intel_ctx { void __iomem *mmio_base; u32 link_mask; acpi_handle handle; + int irq; struct sdw_intel_link_res *links; + struct list_head link_list; }; /*