From patchwork Thu Jan 19 15:05:49 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sricharan Ramabadhran X-Patchwork-Id: 9526149 X-Patchwork-Delegate: agross@codeaurora.org Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 8B2496045D for ; Thu, 19 Jan 2017 15:07:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7BFEF285AA for ; Thu, 19 Jan 2017 15:07:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 70D85285C8; Thu, 19 Jan 2017 15:07:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 63BC1285AA for ; Thu, 19 Jan 2017 15:07:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753349AbdASPHg (ORCPT ); Thu, 19 Jan 2017 10:07:36 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:46216 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753002AbdASPHb (ORCPT ); Thu, 19 Jan 2017 10:07:31 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 2B31460A05; Thu, 19 Jan 2017 15:06:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1484838387; bh=tw9lugvbAQAoGOYdrmbnQowQ4SZokMsoJ85Y8KAVZLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gcckwoeHpW1JGi/2D7lU8BduQx5AuwPF7DG326R5lUHE0CSnqfx+b4N4uwiMop8lf +IfFvTpYLODUhtDIFuswxGatTX47Uy89TZaJ9B0qslohfZKD4FDBP8IIJvUd11Ll6i cN6izV7X6+L5y1CxSpuTmAm65yscY3IiJUc/KgGo= Received: from blr-ubuntu-32.ap.qualcomm.com (unknown [202.46.23.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: sricharan@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 7ECC060867; Thu, 19 Jan 2017 15:06:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1484838385; bh=tw9lugvbAQAoGOYdrmbnQowQ4SZokMsoJ85Y8KAVZLM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nlnk4l5G1SfNd1xyEg0pNvAXCwsxwyniD4SOpEsEZSJA1BI82/RpchM/2/xrBrdA/ GYOt8BK0Jsd+C71GxQAe8yRVoeDij8UlZhfOoz+AXNiyUCoRYnpfbyfn+ALpAtJiIK 4Lz2+nUE0EWYq6821ZrWwJ8+XAS/ovWYeFB2Bmsg= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7ECC060867 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=sricharan@codeaurora.org From: Sricharan R To: robin.murphy@arm.com, will.deacon@arm.com, joro@8bytes.org, lorenzo.pieralisi@arm.com, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, m.szyprowski@samsung.com Cc: sricharan@codeaurora.org Subject: [PATCH V5 05/12] drivers: platform: Configure dma operations at probe time Date: Thu, 19 Jan 2017 20:35:49 +0530 Message-Id: <1484838356-24962-6-git-send-email-sricharan@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1484838356-24962-1-git-send-email-sricharan@codeaurora.org> References: <1484838356-24962-1-git-send-email-sricharan@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Configuring DMA ops at probe time will allow deferring device probe when the IOMMU isn't available yet. The dma_configure for the device is now called from the generic device_attach callback just before the bus/driver probe is called. This way, configuring the DMA ops for the device would be called at the same place for all bus_types, hence the deferred probing mechanism should work for all buses as well. pci_bus_add_devices (platform/amba)(_device_create/driver_register) | | pci_bus_add_device (device_add/driver_register) | | device_attach device_initial_probe | | __device_attach_driver __device_attach_driver | driver_probe_device | really_probe | dma_configure Similarly on the device/driver_unregister path __device_release_driver is called which inturn calls dma_deconfigure. Signed-off-by: Sricharan R --- * Removed the dma configuration for the pci devices in case of DT from pci_dma_configure which was hanging outside separately and doing it in dma_configure function itself. drivers/base/dd.c | 9 +++++++++ drivers/base/dma-mapping.c | 32 ++++++++++++++++++++++++++++++++ drivers/of/platform.c | 5 +---- drivers/pci/probe.c | 5 +---- include/linux/dma-mapping.h | 3 +++ 5 files changed, 46 insertions(+), 8 deletions(-) diff --git a/drivers/base/dd.c b/drivers/base/dd.c index a1fbf55..4882f06 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -19,6 +19,7 @@ #include #include +#include #include #include #include @@ -356,6 +357,10 @@ static int really_probe(struct device *dev, struct device_driver *drv) if (ret) goto pinctrl_bind_failed; + ret = dma_configure(dev); + if (ret) + goto dma_failed; + if (driver_sysfs_add(dev)) { printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n", __func__, dev_name(dev)); @@ -417,6 +422,8 @@ static int really_probe(struct device *dev, struct device_driver *drv) goto done; probe_failed: + dma_deconfigure(dev); +dma_failed: if (dev->bus) blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_DRIVER_NOT_BOUND, dev); @@ -826,6 +833,8 @@ static void __device_release_driver(struct device *dev, struct device *parent) drv->remove(dev); device_links_driver_cleanup(dev); + dma_deconfigure(dev); + devres_release_all(dev); dev->driver = NULL; dev_set_drvdata(dev, NULL); diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c index efd71cf..dfe6fd7 100644 --- a/drivers/base/dma-mapping.c +++ b/drivers/base/dma-mapping.c @@ -10,6 +10,7 @@ #include #include #include +#include #include #include @@ -341,3 +342,34 @@ void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags) vunmap(cpu_addr); } #endif + +/* + * Common configuration to enable DMA API use for a device + */ +#include + +int dma_configure(struct device *dev) +{ + struct device *_dev = dev; + int is_pci = dev_is_pci(dev); + + if (is_pci) { + _dev = pci_get_host_bridge_device(to_pci_dev(dev)); + if (IS_ENABLED(CONFIG_OF) && _dev->parent && + _dev->parent->of_node) + _dev = _dev->parent; + } + + if (_dev->of_node) + of_dma_configure(dev, _dev->of_node); + + if (is_pci) + pci_put_host_bridge_device(_dev); + + return 0; +} + +void dma_deconfigure(struct device *dev) +{ + of_dma_deconfigure(dev); +} diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 57418f7..cf35030 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -186,11 +187,9 @@ static struct platform_device *of_platform_device_create_pdata( dev->dev.bus = &platform_bus_type; dev->dev.platform_data = platform_data; - of_dma_configure(&dev->dev, dev->dev.of_node); of_msi_configure(&dev->dev, dev->dev.of_node); if (of_device_add(dev) != 0) { - of_dma_deconfigure(&dev->dev); platform_device_put(dev); goto err_clear_flag; } @@ -248,7 +247,6 @@ static struct amba_device *of_amba_device_create(struct device_node *node, dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); - of_dma_configure(&dev->dev, dev->dev.of_node); /* Allow the HW Peripheral ID to be overridden */ prop = of_get_property(node, "arm,primecell-periphid", NULL); @@ -542,7 +540,6 @@ static int of_platform_device_destroy(struct device *dev, void *data) amba_device_unregister(to_amba_device(dev)); #endif - of_dma_deconfigure(dev); of_node_clear_flag(dev->of_node, OF_POPULATED); of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); return 0; diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index e164b5c..634d34e 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1873,10 +1873,7 @@ static void pci_dma_configure(struct pci_dev *dev) { struct device *bridge = pci_get_host_bridge_device(dev); - if (IS_ENABLED(CONFIG_OF) && - bridge->parent && bridge->parent->of_node) { - of_dma_configure(&dev->dev, bridge->parent->of_node); - } else if (has_acpi_companion(bridge)) { + if (has_acpi_companion(bridge)) { struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); enum dev_dma_attr attr = acpi_get_dma_attr(adev); diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index abf685ed..b56320a 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -718,6 +718,9 @@ void *dma_mark_declared_memory_occupied(struct device *dev, } #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */ +int dma_configure(struct device *dev); +void dma_deconfigure(struct device *dev); + /* * Managed DMA API */